RDMA/nes: Add missing rcu_read_unlock() in nes_addr_resolve_neigh()
[linux-2.6.git] / drivers / infiniband / hw / nes / nes_cm.c
1 /*
2  * Copyright (c) 2006 - 2009 Intel Corporation.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  */
33
34
35 #define TCPOPT_TIMESTAMP 8
36
37 #include <linux/atomic.h>
38 #include <linux/skbuff.h>
39 #include <linux/ip.h>
40 #include <linux/tcp.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/if_vlan.h>
44 #include <linux/notifier.h>
45 #include <linux/net.h>
46 #include <linux/types.h>
47 #include <linux/timer.h>
48 #include <linux/time.h>
49 #include <linux/delay.h>
50 #include <linux/etherdevice.h>
51 #include <linux/netdevice.h>
52 #include <linux/random.h>
53 #include <linux/list.h>
54 #include <linux/threads.h>
55 #include <linux/highmem.h>
56 #include <linux/slab.h>
57 #include <net/arp.h>
58 #include <net/neighbour.h>
59 #include <net/route.h>
60 #include <net/ip_fib.h>
61 #include <net/tcp.h>
62
63 #include "nes.h"
64
65 u32 cm_packets_sent;
66 u32 cm_packets_bounced;
67 u32 cm_packets_dropped;
68 u32 cm_packets_retrans;
69 u32 cm_packets_created;
70 u32 cm_packets_received;
71 atomic_t cm_listens_created;
72 atomic_t cm_listens_destroyed;
73 u32 cm_backlog_drops;
74 atomic_t cm_loopbacks;
75 atomic_t cm_nodes_created;
76 atomic_t cm_nodes_destroyed;
77 atomic_t cm_accel_dropped_pkts;
78 atomic_t cm_resets_recvd;
79
80 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
81 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
82 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
83 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
84 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
85 static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
86 static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
87 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
88 static int mini_cm_dealloc_core(struct nes_cm_core *);
89 static int mini_cm_get(struct nes_cm_core *);
90 static int mini_cm_set(struct nes_cm_core *, u32, u32);
91
92 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
93 static int add_ref_cm_node(struct nes_cm_node *);
94 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
95
96 static int nes_cm_disconn_true(struct nes_qp *);
97 static int nes_cm_post_event(struct nes_cm_event *event);
98 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
99 static void nes_disconnect_worker(struct work_struct *work);
100
101 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
102 static int send_mpa_reject(struct nes_cm_node *);
103 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
104 static int send_reset(struct nes_cm_node *, struct sk_buff *);
105 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
106 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
107 static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
108
109 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
110 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
111 static void cleanup_retrans_entry(struct nes_cm_node *);
112 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
113 static void free_retrans_entry(struct nes_cm_node *cm_node);
114 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
115
116 /* CM event handler functions */
117 static void cm_event_connected(struct nes_cm_event *);
118 static void cm_event_connect_error(struct nes_cm_event *);
119 static void cm_event_reset(struct nes_cm_event *);
120 static void cm_event_mpa_req(struct nes_cm_event *);
121 static void cm_event_mpa_reject(struct nes_cm_event *);
122 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
123
124 /* MPA build functions */
125 static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
126 static void build_mpa_v2(struct nes_cm_node *, void *, u8);
127 static void build_mpa_v1(struct nes_cm_node *, void *, u8);
128 static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
129
130 static void print_core(struct nes_cm_core *core);
131
132 /* External CM API Interface */
133 /* instance of function pointers for client API */
134 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
135 static struct nes_cm_ops nes_cm_api = {
136         mini_cm_accelerated,
137         mini_cm_listen,
138         mini_cm_del_listen,
139         mini_cm_connect,
140         mini_cm_close,
141         mini_cm_accept,
142         mini_cm_reject,
143         mini_cm_recv_pkt,
144         mini_cm_dealloc_core,
145         mini_cm_get,
146         mini_cm_set
147 };
148
149 static struct nes_cm_core *g_cm_core;
150
151 atomic_t cm_connects;
152 atomic_t cm_accepts;
153 atomic_t cm_disconnects;
154 atomic_t cm_closes;
155 atomic_t cm_connecteds;
156 atomic_t cm_connect_reqs;
157 atomic_t cm_rejects;
158
159 int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
160 {
161         return add_ref_cm_node(cm_node);
162 }
163
164 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
165 {
166         return rem_ref_cm_node(cm_node->cm_core, cm_node);
167 }
168
169 /**
170  * create_event
171  */
172 static struct nes_cm_event *create_event(struct nes_cm_node *   cm_node,
173                                          enum nes_cm_event_type type)
174 {
175         struct nes_cm_event *event;
176
177         if (!cm_node->cm_id)
178                 return NULL;
179
180         /* allocate an empty event */
181         event = kzalloc(sizeof(*event), GFP_ATOMIC);
182
183         if (!event)
184                 return NULL;
185
186         event->type = type;
187         event->cm_node = cm_node;
188         event->cm_info.rem_addr = cm_node->rem_addr;
189         event->cm_info.loc_addr = cm_node->loc_addr;
190         event->cm_info.rem_port = cm_node->rem_port;
191         event->cm_info.loc_port = cm_node->loc_port;
192         event->cm_info.cm_id = cm_node->cm_id;
193
194         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
195                   "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
196                   cm_node, event, type, event->cm_info.loc_addr,
197                   event->cm_info.loc_port, event->cm_info.rem_addr,
198                   event->cm_info.rem_port);
199
200         nes_cm_post_event(event);
201         return event;
202 }
203
204
205 /**
206  * send_mpa_request
207  */
208 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
209 {
210         u8 start_addr = 0;
211         u8 *start_ptr = &start_addr;
212         u8 **start_buff = &start_ptr;
213         u16 buff_len = 0;
214
215         if (!skb) {
216                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
217                 return -1;
218         }
219
220         /* send an MPA Request frame */
221         cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
222         form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
223
224         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
225 }
226
227
228
229 static int send_mpa_reject(struct nes_cm_node *cm_node)
230 {
231         struct sk_buff *skb = NULL;
232         u8 start_addr = 0;
233         u8 *start_ptr = &start_addr;
234         u8 **start_buff = &start_ptr;
235         u16 buff_len = 0;
236         struct ietf_mpa_v1 *mpa_frame;
237
238         skb = dev_alloc_skb(MAX_CM_BUFFER);
239         if (!skb) {
240                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
241                 return -ENOMEM;
242         }
243
244         /* send an MPA reject frame */
245         cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
246         mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
247         mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
248         form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
249
250         cm_node->state = NES_CM_STATE_FIN_WAIT1;
251         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
252 }
253
254
255 /**
256  * recv_mpa - process a received TCP pkt, we are expecting an
257  * IETF MPA frame
258  */
259 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
260                      u32 len)
261 {
262         struct ietf_mpa_v1 *mpa_frame;
263         struct ietf_mpa_v2 *mpa_v2_frame;
264         struct ietf_rtr_msg *rtr_msg;
265         int mpa_hdr_len;
266         int priv_data_len;
267
268         *type = NES_MPA_REQUEST_ACCEPT;
269
270         /* assume req frame is in tcp data payload */
271         if (len < sizeof(struct ietf_mpa_v1)) {
272                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
273                 return -EINVAL;
274         }
275
276         /* points to the beginning of the frame, which could be MPA V1 or V2 */
277         mpa_frame = (struct ietf_mpa_v1 *)buffer;
278         mpa_hdr_len = sizeof(struct ietf_mpa_v1);
279         priv_data_len = ntohs(mpa_frame->priv_data_len);
280
281         /* make sure mpa private data len is less than 512 bytes */
282         if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
283                 nes_debug(NES_DBG_CM, "The received Length of Private"
284                           " Data field exceeds 512 octets\n");
285                 return -EINVAL;
286         }
287         /*
288          * make sure MPA receiver interoperate with the
289          * received MPA version and MPA key information
290          *
291          */
292         if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
293                 nes_debug(NES_DBG_CM, "The received mpa version"
294                           " is not supported\n");
295                 return -EINVAL;
296         }
297         /*
298         * backwards compatibility only
299         */
300         if (mpa_frame->rev > cm_node->mpa_frame_rev) {
301                 nes_debug(NES_DBG_CM, "The received mpa version"
302                         " can not be interoperated\n");
303                 return -EINVAL;
304         } else {
305                 cm_node->mpa_frame_rev = mpa_frame->rev;
306         }
307
308         if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
309                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
310                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
311                         return -EINVAL;
312                 }
313         } else {
314                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
315                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
316                         return -EINVAL;
317                 }
318         }
319
320
321         if (priv_data_len + mpa_hdr_len != len) {
322                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
323                         " complete (%x + %x != %x)\n",
324                         priv_data_len, mpa_hdr_len, len);
325                 return -EINVAL;
326         }
327         /* make sure it does not exceed the max size */
328         if (len > MAX_CM_BUFFER) {
329                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
330                         " (%x + %x != %x)\n",
331                         priv_data_len, mpa_hdr_len, len);
332                 return -EINVAL;
333         }
334
335         cm_node->mpa_frame_size = priv_data_len;
336
337         switch (mpa_frame->rev) {
338         case IETF_MPA_V2: {
339                 u16 ird_size;
340                 u16 ord_size;
341                 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
342                 mpa_hdr_len += IETF_RTR_MSG_SIZE;
343                 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
344                 rtr_msg = &mpa_v2_frame->rtr_msg;
345
346                 /* parse rtr message */
347                 rtr_msg->ctrl_ird = ntohs(rtr_msg->ctrl_ird);
348                 rtr_msg->ctrl_ord = ntohs(rtr_msg->ctrl_ord);
349                 ird_size = rtr_msg->ctrl_ird & IETF_NO_IRD_ORD;
350                 ord_size = rtr_msg->ctrl_ord & IETF_NO_IRD_ORD;
351
352                 if (!(rtr_msg->ctrl_ird & IETF_PEER_TO_PEER)) {
353                         /* send reset */
354                         return -EINVAL;
355                 }
356
357                 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
358                         /* responder */
359                         if (cm_node->ord_size > ird_size)
360                                 cm_node->ord_size = ird_size;
361                 } else {
362                         /* initiator */
363                         if (cm_node->ord_size > ird_size)
364                                 cm_node->ord_size = ird_size;
365
366                         if (cm_node->ird_size < ord_size) {
367                                 /* no resources available */
368                                 /* send terminate message */
369                                 return -EINVAL;
370                         }
371                 }
372
373                 if (rtr_msg->ctrl_ord & IETF_RDMA0_READ) {
374                         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
375                 } else if (rtr_msg->ctrl_ord & IETF_RDMA0_WRITE) {
376                         cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
377                 } else {        /* Not supported RDMA0 operation */
378                         return -EINVAL;
379                 }
380                 break;
381         }
382         case IETF_MPA_V1:
383         default:
384                 break;
385         }
386
387         /* copy entire MPA frame to our cm_node's frame */
388         memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
389
390         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
391                 *type = NES_MPA_REQUEST_REJECT;
392         return 0;
393 }
394
395
396 /**
397  * form_cm_frame - get a free packet and build empty frame Use
398  * node info to build.
399  */
400 static void form_cm_frame(struct sk_buff *skb,
401                           struct nes_cm_node *cm_node, void *options, u32 optionsize,
402                           void *data, u32 datasize, u8 flags)
403 {
404         struct tcphdr *tcph;
405         struct iphdr *iph;
406         struct ethhdr *ethh;
407         u8 *buf;
408         u16 packetsize = sizeof(*iph);
409
410         packetsize += sizeof(*tcph);
411         packetsize += optionsize + datasize;
412
413         skb_trim(skb, 0);
414         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
415
416         buf = skb_put(skb, packetsize + ETH_HLEN);
417
418         ethh = (struct ethhdr *)buf;
419         buf += ETH_HLEN;
420
421         iph = (struct iphdr *)buf;
422         buf += sizeof(*iph);
423         tcph = (struct tcphdr *)buf;
424         skb_reset_mac_header(skb);
425         skb_set_network_header(skb, ETH_HLEN);
426         skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
427         buf += sizeof(*tcph);
428
429         skb->ip_summed = CHECKSUM_PARTIAL;
430         skb->protocol = htons(0x800);
431         skb->data_len = 0;
432         skb->mac_len = ETH_HLEN;
433
434         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
435         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
436         ethh->h_proto = htons(0x0800);
437
438         iph->version = IPVERSION;
439         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
440         iph->tos = 0;
441         iph->tot_len = htons(packetsize);
442         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
443
444         iph->frag_off = htons(0x4000);
445         iph->ttl = 0x40;
446         iph->protocol = 0x06;   /* IPPROTO_TCP */
447
448         iph->saddr = htonl(cm_node->loc_addr);
449         iph->daddr = htonl(cm_node->rem_addr);
450
451         tcph->source = htons(cm_node->loc_port);
452         tcph->dest = htons(cm_node->rem_port);
453         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
454
455         if (flags & SET_ACK) {
456                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
457                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
458                 tcph->ack = 1;
459         } else {
460                 tcph->ack_seq = 0;
461         }
462
463         if (flags & SET_SYN) {
464                 cm_node->tcp_cntxt.loc_seq_num++;
465                 tcph->syn = 1;
466         } else {
467                 cm_node->tcp_cntxt.loc_seq_num += datasize;
468         }
469
470         if (flags & SET_FIN) {
471                 cm_node->tcp_cntxt.loc_seq_num++;
472                 tcph->fin = 1;
473         }
474
475         if (flags & SET_RST)
476                 tcph->rst = 1;
477
478         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
479         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
480         tcph->urg_ptr = 0;
481         if (optionsize)
482                 memcpy(buf, options, optionsize);
483         buf += optionsize;
484         if (datasize)
485                 memcpy(buf, data, datasize);
486
487         skb_shinfo(skb)->nr_frags = 0;
488         cm_packets_created++;
489 }
490
491 /**
492  * print_core - dump a cm core
493  */
494 static void print_core(struct nes_cm_core *core)
495 {
496         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
497         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
498         if (!core)
499                 return;
500         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
501
502         nes_debug(NES_DBG_CM, "State         : %u \n", core->state);
503
504         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
505         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
506
507         nes_debug(NES_DBG_CM, "core          : %p \n", core);
508
509         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
510 }
511
512 /**
513  * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
514  */
515 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
516                               u16 *buff_len, u8 *pci_mem, u8 mpa_key)
517 {
518         int ret = 0;
519
520         *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
521
522         switch (cm_node->mpa_frame_rev) {
523         case IETF_MPA_V1:
524                 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
525                 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
526                 build_mpa_v1(cm_node, *start_buff, mpa_key);
527                 break;
528         case IETF_MPA_V2:
529                 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
530                 build_mpa_v2(cm_node, *start_buff, mpa_key);
531                 break;
532         default:
533                 ret = -EINVAL;
534         }
535         return ret;
536 }
537
538 /**
539  * build_mpa_v2 - build a MPA V2 frame
540  */
541 static void build_mpa_v2(struct nes_cm_node *cm_node,
542                          void *start_addr, u8 mpa_key)
543 {
544         struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
545         struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
546
547         /* initialize the upper 5 bytes of the frame */
548         build_mpa_v1(cm_node, start_addr, mpa_key);
549         mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
550         mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
551
552         /* initialize RTR msg */
553         rtr_msg->ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
554                             IETF_NO_IRD_ORD : cm_node->ird_size;
555         rtr_msg->ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
556                             IETF_NO_IRD_ORD : cm_node->ord_size;
557
558         rtr_msg->ctrl_ird |= IETF_PEER_TO_PEER;
559         rtr_msg->ctrl_ird |= IETF_FLPDU_ZERO_LEN;
560
561         switch (mpa_key) {
562         case MPA_KEY_REQUEST:
563                 rtr_msg->ctrl_ord |= IETF_RDMA0_WRITE;
564                 rtr_msg->ctrl_ord |= IETF_RDMA0_READ;
565                 break;
566         case MPA_KEY_REPLY:
567                 switch (cm_node->send_rdma0_op) {
568                 case SEND_RDMA_WRITE_ZERO:
569                         rtr_msg->ctrl_ord |= IETF_RDMA0_WRITE;
570                         break;
571                 case SEND_RDMA_READ_ZERO:
572                         rtr_msg->ctrl_ord |= IETF_RDMA0_READ;
573                         break;
574                 }
575         }
576         rtr_msg->ctrl_ird = htons(rtr_msg->ctrl_ird);
577         rtr_msg->ctrl_ord = htons(rtr_msg->ctrl_ord);
578 }
579
580 /**
581  * build_mpa_v1 - build a MPA V1 frame
582  */
583 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
584 {
585         struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
586
587         switch (mpa_key) {
588         case MPA_KEY_REQUEST:
589                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
590                 break;
591         case MPA_KEY_REPLY:
592                 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
593                 break;
594         }
595         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
596         mpa_frame->rev = cm_node->mpa_frame_rev;
597         mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
598 }
599
600 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
601 {
602         u64 u64temp;
603         struct nes_qp *nesqp = *nesqp_addr;
604         struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
605
606         u64temp = (unsigned long)nesqp;
607         u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
608         set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
609
610         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
611         wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
612
613         switch (cm_node->send_rdma0_op) {
614         case SEND_RDMA_WRITE_ZERO:
615                 nes_debug(NES_DBG_CM, "Sending first write.\n");
616                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
617                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
618                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
619                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
620                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
621                 break;
622
623         case SEND_RDMA_READ_ZERO:
624         default:
625                 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO) {
626                         printk(KERN_ERR "%s[%u]: Unsupported RDMA0 len operation=%u\n",
627                                  __func__, __LINE__, cm_node->send_rdma0_op);
628                         WARN_ON(1);
629                 }
630                 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
631                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
632                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
633                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
634                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
635                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
636                 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
637                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
638                 break;
639         }
640
641         if (nesqp->sq_kmapped) {
642                 nesqp->sq_kmapped = 0;
643                 kunmap(nesqp->page);
644         }
645
646         /*use the reserved spot on the WQ for the extra first WQE*/
647         nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
648                                                              NES_QPCONTEXT_ORDIRD_WRPDU |
649                                                              NES_QPCONTEXT_ORDIRD_ALSMM));
650         nesqp->skip_lsmm = 1;
651         nesqp->hwqp.sq_tail = 0;
652 }
653
654 /**
655  * schedule_nes_timer
656  * note - cm_node needs to be protected before calling this. Encase in:
657  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
658  */
659 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
660                        enum nes_timer_type type, int send_retrans,
661                        int close_when_complete)
662 {
663         unsigned long flags;
664         struct nes_cm_core *cm_core = cm_node->cm_core;
665         struct nes_timer_entry *new_send;
666         int ret = 0;
667         u32 was_timer_set;
668
669         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
670         if (!new_send)
671                 return -ENOMEM;
672
673         /* new_send->timetosend = currenttime */
674         new_send->retrycount = NES_DEFAULT_RETRYS;
675         new_send->retranscount = NES_DEFAULT_RETRANS;
676         new_send->skb = skb;
677         new_send->timetosend = jiffies;
678         new_send->type = type;
679         new_send->netdev = cm_node->netdev;
680         new_send->send_retrans = send_retrans;
681         new_send->close_when_complete = close_when_complete;
682
683         if (type == NES_TIMER_TYPE_CLOSE) {
684                 new_send->timetosend += (HZ / 10);
685                 if (cm_node->recv_entry) {
686                         kfree(new_send);
687                         WARN_ON(1);
688                         return -EINVAL;
689                 }
690                 cm_node->recv_entry = new_send;
691         }
692
693         if (type == NES_TIMER_TYPE_SEND) {
694                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
695                 atomic_inc(&new_send->skb->users);
696                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
697                 cm_node->send_entry = new_send;
698                 add_ref_cm_node(cm_node);
699                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
700                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
701
702                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
703                 if (ret != NETDEV_TX_OK) {
704                         nes_debug(NES_DBG_CM, "Error sending packet %p "
705                                   "(jiffies = %lu)\n", new_send, jiffies);
706                         new_send->timetosend = jiffies;
707                         ret = NETDEV_TX_OK;
708                 } else {
709                         cm_packets_sent++;
710                         if (!send_retrans) {
711                                 cleanup_retrans_entry(cm_node);
712                                 if (close_when_complete)
713                                         rem_ref_cm_node(cm_core, cm_node);
714                                 return ret;
715                         }
716                 }
717         }
718
719         was_timer_set = timer_pending(&cm_core->tcp_timer);
720
721         if (!was_timer_set) {
722                 cm_core->tcp_timer.expires = new_send->timetosend;
723                 add_timer(&cm_core->tcp_timer);
724         }
725
726         return ret;
727 }
728
729 static void nes_retrans_expired(struct nes_cm_node *cm_node)
730 {
731         struct iw_cm_id *cm_id = cm_node->cm_id;
732         enum nes_cm_node_state state = cm_node->state;
733         cm_node->state = NES_CM_STATE_CLOSED;
734
735         switch (state) {
736         case NES_CM_STATE_SYN_RCVD:
737         case NES_CM_STATE_CLOSING:
738                 rem_ref_cm_node(cm_node->cm_core, cm_node);
739                 break;
740         case NES_CM_STATE_LAST_ACK:
741         case NES_CM_STATE_FIN_WAIT1:
742                 if (cm_node->cm_id)
743                         cm_id->rem_ref(cm_id);
744                 send_reset(cm_node, NULL);
745                 break;
746         default:
747                 add_ref_cm_node(cm_node);
748                 send_reset(cm_node, NULL);
749                 create_event(cm_node, NES_CM_EVENT_ABORTED);
750         }
751 }
752
753 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
754 {
755         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
756         struct iw_cm_id *cm_id = cm_node->cm_id;
757         struct nes_qp *nesqp;
758         unsigned long qplockflags;
759
760         if (!recv_entry)
761                 return;
762         nesqp = (struct nes_qp *)recv_entry->skb;
763         if (nesqp) {
764                 spin_lock_irqsave(&nesqp->lock, qplockflags);
765                 if (nesqp->cm_id) {
766                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
767                                   "refcount = %d: HIT A "
768                                   "NES_TIMER_TYPE_CLOSE with something "
769                                   "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
770                                   atomic_read(&nesqp->refcount));
771                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
772                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
773                         nesqp->ibqp_state = IB_QPS_ERR;
774                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
775                         nes_cm_disconn(nesqp);
776                 } else {
777                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
778                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
779                                   "refcount = %d: HIT A "
780                                   "NES_TIMER_TYPE_CLOSE with nothing "
781                                   "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
782                                   atomic_read(&nesqp->refcount));
783                 }
784         } else if (rem_node) {
785                 /* TIME_WAIT state */
786                 rem_ref_cm_node(cm_node->cm_core, cm_node);
787         }
788         if (cm_node->cm_id)
789                 cm_id->rem_ref(cm_id);
790         kfree(recv_entry);
791         cm_node->recv_entry = NULL;
792 }
793
794 /**
795  * nes_cm_timer_tick
796  */
797 static void nes_cm_timer_tick(unsigned long pass)
798 {
799         unsigned long flags;
800         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
801         struct nes_cm_node *cm_node;
802         struct nes_timer_entry *send_entry, *recv_entry;
803         struct list_head *list_core_temp;
804         struct list_head *list_node;
805         struct nes_cm_core *cm_core = g_cm_core;
806         u32 settimer = 0;
807         unsigned long timetosend;
808         int ret = NETDEV_TX_OK;
809
810         struct list_head timer_list;
811
812         INIT_LIST_HEAD(&timer_list);
813         spin_lock_irqsave(&cm_core->ht_lock, flags);
814
815         list_for_each_safe(list_node, list_core_temp,
816                            &cm_core->connected_nodes) {
817                 cm_node = container_of(list_node, struct nes_cm_node, list);
818                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
819                         add_ref_cm_node(cm_node);
820                         list_add(&cm_node->timer_entry, &timer_list);
821                 }
822         }
823         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
824
825         list_for_each_safe(list_node, list_core_temp, &timer_list) {
826                 cm_node = container_of(list_node, struct nes_cm_node,
827                                        timer_entry);
828                 recv_entry = cm_node->recv_entry;
829
830                 if (recv_entry) {
831                         if (time_after(recv_entry->timetosend, jiffies)) {
832                                 if (nexttimeout > recv_entry->timetosend ||
833                                     !settimer) {
834                                         nexttimeout = recv_entry->timetosend;
835                                         settimer = 1;
836                                 }
837                         } else {
838                                 handle_recv_entry(cm_node, 1);
839                         }
840                 }
841
842                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
843                 do {
844                         send_entry = cm_node->send_entry;
845                         if (!send_entry)
846                                 break;
847                         if (time_after(send_entry->timetosend, jiffies)) {
848                                 if (cm_node->state != NES_CM_STATE_TSA) {
849                                         if ((nexttimeout >
850                                              send_entry->timetosend) ||
851                                             !settimer) {
852                                                 nexttimeout =
853                                                         send_entry->timetosend;
854                                                 settimer = 1;
855                                         }
856                                 } else {
857                                         free_retrans_entry(cm_node);
858                                 }
859                                 break;
860                         }
861
862                         if ((cm_node->state == NES_CM_STATE_TSA) ||
863                             (cm_node->state == NES_CM_STATE_CLOSED)) {
864                                 free_retrans_entry(cm_node);
865                                 break;
866                         }
867
868                         if (!send_entry->retranscount ||
869                             !send_entry->retrycount) {
870                                 cm_packets_dropped++;
871                                 free_retrans_entry(cm_node);
872
873                                 spin_unlock_irqrestore(
874                                         &cm_node->retrans_list_lock, flags);
875                                 nes_retrans_expired(cm_node);
876                                 cm_node->state = NES_CM_STATE_CLOSED;
877                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
878                                                   flags);
879                                 break;
880                         }
881                         atomic_inc(&send_entry->skb->users);
882                         cm_packets_retrans++;
883                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
884                                   "for node %p, jiffies = %lu, time to send = "
885                                   "%lu, retranscount = %u, send_entry->seq_num = "
886                                   "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
887                                   "0x%08X\n", send_entry, cm_node, jiffies,
888                                   send_entry->timetosend,
889                                   send_entry->retranscount,
890                                   send_entry->seq_num,
891                                   cm_node->tcp_cntxt.rem_ack_num);
892
893                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
894                                                flags);
895                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
896                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
897                         if (ret != NETDEV_TX_OK) {
898                                 nes_debug(NES_DBG_CM, "rexmit failed for "
899                                           "node=%p\n", cm_node);
900                                 cm_packets_bounced++;
901                                 send_entry->retrycount--;
902                                 nexttimeout = jiffies + NES_SHORT_TIME;
903                                 settimer = 1;
904                                 break;
905                         } else {
906                                 cm_packets_sent++;
907                         }
908                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
909                                   "%u, retry count = %u.\n",
910                                   send_entry->retranscount,
911                                   send_entry->retrycount);
912                         if (send_entry->send_retrans) {
913                                 send_entry->retranscount--;
914                                 timetosend = (NES_RETRY_TIMEOUT <<
915                                               (NES_DEFAULT_RETRANS - send_entry->retranscount));
916
917                                 send_entry->timetosend = jiffies +
918                                                          min(timetosend, NES_MAX_TIMEOUT);
919                                 if (nexttimeout > send_entry->timetosend ||
920                                     !settimer) {
921                                         nexttimeout = send_entry->timetosend;
922                                         settimer = 1;
923                                 }
924                         } else {
925                                 int close_when_complete;
926                                 close_when_complete =
927                                         send_entry->close_when_complete;
928                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
929                                           cm_node, cm_node->state);
930                                 free_retrans_entry(cm_node);
931                                 if (close_when_complete)
932                                         rem_ref_cm_node(cm_node->cm_core,
933                                                         cm_node);
934                         }
935                 } while (0);
936
937                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
938                 rem_ref_cm_node(cm_node->cm_core, cm_node);
939         }
940
941         if (settimer) {
942                 if (!timer_pending(&cm_core->tcp_timer)) {
943                         cm_core->tcp_timer.expires = nexttimeout;
944                         add_timer(&cm_core->tcp_timer);
945                 }
946         }
947 }
948
949
950 /**
951  * send_syn
952  */
953 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
954                     struct sk_buff *skb)
955 {
956         int ret;
957         int flags = SET_SYN;
958         char optionsbuffer[sizeof(struct option_mss) +
959                            sizeof(struct option_windowscale) + sizeof(struct option_base) +
960                            TCP_OPTIONS_PADDING];
961
962         int optionssize = 0;
963         /* Sending MSS option */
964         union all_known_options *options;
965
966         if (!cm_node)
967                 return -EINVAL;
968
969         options = (union all_known_options *)&optionsbuffer[optionssize];
970         options->as_mss.optionnum = OPTION_NUMBER_MSS;
971         options->as_mss.length = sizeof(struct option_mss);
972         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
973         optionssize += sizeof(struct option_mss);
974
975         options = (union all_known_options *)&optionsbuffer[optionssize];
976         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
977         options->as_windowscale.length = sizeof(struct option_windowscale);
978         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
979         optionssize += sizeof(struct option_windowscale);
980
981         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
982                 options = (union all_known_options *)&optionsbuffer[optionssize];
983                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
984                 options->as_base.length = sizeof(struct option_base);
985                 optionssize += sizeof(struct option_base);
986                 /* we need the size to be a multiple of 4 */
987                 options = (union all_known_options *)&optionsbuffer[optionssize];
988                 options->as_end = 1;
989                 optionssize += 1;
990                 options = (union all_known_options *)&optionsbuffer[optionssize];
991                 options->as_end = 1;
992                 optionssize += 1;
993         }
994
995         options = (union all_known_options *)&optionsbuffer[optionssize];
996         options->as_end = OPTION_NUMBER_END;
997         optionssize += 1;
998
999         if (!skb)
1000                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1001         if (!skb) {
1002                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1003                 return -1;
1004         }
1005
1006         if (sendack)
1007                 flags |= SET_ACK;
1008
1009         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1010         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1011
1012         return ret;
1013 }
1014
1015
1016 /**
1017  * send_reset
1018  */
1019 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1020 {
1021         int ret;
1022         int flags = SET_RST | SET_ACK;
1023
1024         if (!skb)
1025                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1026         if (!skb) {
1027                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1028                 return -ENOMEM;
1029         }
1030
1031         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1032         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1033
1034         return ret;
1035 }
1036
1037
1038 /**
1039  * send_ack
1040  */
1041 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1042 {
1043         int ret;
1044
1045         if (!skb)
1046                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1047
1048         if (!skb) {
1049                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1050                 return -1;
1051         }
1052
1053         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1054         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1055
1056         return ret;
1057 }
1058
1059
1060 /**
1061  * send_fin
1062  */
1063 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1064 {
1065         int ret;
1066
1067         /* if we didn't get a frame get one */
1068         if (!skb)
1069                 skb = dev_alloc_skb(MAX_CM_BUFFER);
1070
1071         if (!skb) {
1072                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1073                 return -1;
1074         }
1075
1076         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1077         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1078
1079         return ret;
1080 }
1081
1082
1083 /**
1084  * find_node - find a cm node that matches the reference cm node
1085  */
1086 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1087                                      u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1088 {
1089         unsigned long flags;
1090         struct list_head *hte;
1091         struct nes_cm_node *cm_node;
1092
1093         /* get a handle on the hte */
1094         hte = &cm_core->connected_nodes;
1095
1096         /* walk list and find cm_node associated with this session ID */
1097         spin_lock_irqsave(&cm_core->ht_lock, flags);
1098         list_for_each_entry(cm_node, hte, list) {
1099                 /* compare quad, return node handle if a match */
1100                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1101                           cm_node->loc_addr, cm_node->loc_port,
1102                           loc_addr, loc_port,
1103                           cm_node->rem_addr, cm_node->rem_port,
1104                           rem_addr, rem_port);
1105                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
1106                     (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
1107                         add_ref_cm_node(cm_node);
1108                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1109                         return cm_node;
1110                 }
1111         }
1112         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1113
1114         /* no owner node */
1115         return NULL;
1116 }
1117
1118
1119 /**
1120  * find_listener - find a cm node listening on this addr-port pair
1121  */
1122 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1123                                              nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
1124 {
1125         unsigned long flags;
1126         struct nes_cm_listener *listen_node;
1127
1128         /* walk list and find cm_node associated with this session ID */
1129         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1130         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1131                 /* compare node pair, return node handle if a match */
1132                 if (((listen_node->loc_addr == dst_addr) ||
1133                      listen_node->loc_addr == 0x00000000) &&
1134                     (listen_node->loc_port == dst_port) &&
1135                     (listener_state & listen_node->listener_state)) {
1136                         atomic_inc(&listen_node->ref_count);
1137                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1138                         return listen_node;
1139                 }
1140         }
1141         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1142
1143         /* no listener */
1144         return NULL;
1145 }
1146
1147
1148 /**
1149  * add_hte_node - add a cm node to the hash table
1150  */
1151 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1152 {
1153         unsigned long flags;
1154         struct list_head *hte;
1155
1156         if (!cm_node || !cm_core)
1157                 return -EINVAL;
1158
1159         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1160                   cm_node);
1161
1162         spin_lock_irqsave(&cm_core->ht_lock, flags);
1163
1164         /* get a handle on the hash table element (list head for this slot) */
1165         hte = &cm_core->connected_nodes;
1166         list_add_tail(&cm_node->list, hte);
1167         atomic_inc(&cm_core->ht_node_cnt);
1168
1169         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1170
1171         return 0;
1172 }
1173
1174
1175 /**
1176  * mini_cm_dec_refcnt_listen
1177  */
1178 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1179                                      struct nes_cm_listener *listener, int free_hanging_nodes)
1180 {
1181         int ret = -EINVAL;
1182         int err = 0;
1183         unsigned long flags;
1184         struct list_head *list_pos = NULL;
1185         struct list_head *list_temp = NULL;
1186         struct nes_cm_node *cm_node = NULL;
1187         struct list_head reset_list;
1188
1189         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1190                   "refcnt=%d\n", listener, free_hanging_nodes,
1191                   atomic_read(&listener->ref_count));
1192         /* free non-accelerated child nodes for this listener */
1193         INIT_LIST_HEAD(&reset_list);
1194         if (free_hanging_nodes) {
1195                 spin_lock_irqsave(&cm_core->ht_lock, flags);
1196                 list_for_each_safe(list_pos, list_temp,
1197                                    &g_cm_core->connected_nodes) {
1198                         cm_node = container_of(list_pos, struct nes_cm_node,
1199                                                list);
1200                         if ((cm_node->listener == listener) &&
1201                             (!cm_node->accelerated)) {
1202                                 add_ref_cm_node(cm_node);
1203                                 list_add(&cm_node->reset_entry, &reset_list);
1204                         }
1205                 }
1206                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1207         }
1208
1209         list_for_each_safe(list_pos, list_temp, &reset_list) {
1210                 cm_node = container_of(list_pos, struct nes_cm_node,
1211                                        reset_entry);
1212                 {
1213                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
1214                         enum nes_cm_node_state old_state;
1215                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1216                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1217                         } else {
1218                                 if (!loopback) {
1219                                         cleanup_retrans_entry(cm_node);
1220                                         err = send_reset(cm_node, NULL);
1221                                         if (err) {
1222                                                 cm_node->state =
1223                                                         NES_CM_STATE_CLOSED;
1224                                                 WARN_ON(1);
1225                                         } else {
1226                                                 old_state = cm_node->state;
1227                                                 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1228                                                 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1229                                                         rem_ref_cm_node(
1230                                                                 cm_node->cm_core,
1231                                                                 cm_node);
1232                                         }
1233                                 } else {
1234                                         struct nes_cm_event event;
1235
1236                                         event.cm_node = loopback;
1237                                         event.cm_info.rem_addr =
1238                                                         loopback->rem_addr;
1239                                         event.cm_info.loc_addr =
1240                                                         loopback->loc_addr;
1241                                         event.cm_info.rem_port =
1242                                                         loopback->rem_port;
1243                                         event.cm_info.loc_port =
1244                                                          loopback->loc_port;
1245                                         event.cm_info.cm_id = loopback->cm_id;
1246                                         add_ref_cm_node(loopback);
1247                                         loopback->state = NES_CM_STATE_CLOSED;
1248                                         cm_event_connect_error(&event);
1249                                         cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1250
1251                                         rem_ref_cm_node(cm_node->cm_core,
1252                                                          cm_node);
1253
1254                                 }
1255                         }
1256                 }
1257         }
1258
1259         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1260         if (!atomic_dec_return(&listener->ref_count)) {
1261                 list_del(&listener->list);
1262
1263                 /* decrement our listen node count */
1264                 atomic_dec(&cm_core->listen_node_cnt);
1265
1266                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1267
1268                 if (listener->nesvnic)
1269                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1270                                          PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1271
1272                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1273
1274                 kfree(listener);
1275                 listener = NULL;
1276                 ret = 0;
1277                 atomic_inc(&cm_listens_destroyed);
1278         } else {
1279                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1280         }
1281         if (listener) {
1282                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1283                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1284                                   " with non-zero pending accepts=%u\n",
1285                                   listener, atomic_read(&listener->pend_accepts_cnt));
1286         }
1287
1288         return ret;
1289 }
1290
1291
1292 /**
1293  * mini_cm_del_listen
1294  */
1295 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1296                               struct nes_cm_listener *listener)
1297 {
1298         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1299         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1300         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1301 }
1302
1303
1304 /**
1305  * mini_cm_accelerated
1306  */
1307 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1308                                       struct nes_cm_node *cm_node)
1309 {
1310         u32 was_timer_set;
1311
1312         cm_node->accelerated = 1;
1313
1314         if (cm_node->accept_pend) {
1315                 BUG_ON(!cm_node->listener);
1316                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1317                 cm_node->accept_pend = 0;
1318                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1319         }
1320
1321         was_timer_set = timer_pending(&cm_core->tcp_timer);
1322         if (!was_timer_set) {
1323                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1324                 add_timer(&cm_core->tcp_timer);
1325         }
1326
1327         return 0;
1328 }
1329
1330
1331 /**
1332  * nes_addr_resolve_neigh
1333  */
1334 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1335 {
1336         struct rtable *rt;
1337         struct neighbour *neigh;
1338         int rc = arpindex;
1339         struct net_device *netdev;
1340         struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1341
1342         rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
1343         if (IS_ERR(rt)) {
1344                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1345                        __func__, dst_ip);
1346                 return rc;
1347         }
1348
1349         if (netif_is_bond_slave(nesvnic->netdev))
1350                 netdev = nesvnic->netdev->master;
1351         else
1352                 netdev = nesvnic->netdev;
1353
1354         rcu_read_lock();
1355         neigh = dst_get_neighbour_noref(&rt->dst);
1356         if (neigh) {
1357                 if (neigh->nud_state & NUD_VALID) {
1358                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1359                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1360                                   neigh->ha, ntohl(rt->rt_gateway));
1361
1362                         if (arpindex >= 0) {
1363                                 if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1364                                             neigh->ha, ETH_ALEN)) {
1365                                         /* Mac address same as in nes_arp_table */
1366                                         goto out;
1367                                 }
1368
1369                                 nes_manage_arp_cache(nesvnic->netdev,
1370                                                      nesadapter->arp_table[arpindex].mac_addr,
1371                                                      dst_ip, NES_ARP_DELETE);
1372                         }
1373
1374                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1375                                              dst_ip, NES_ARP_ADD);
1376                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1377                                            NES_ARP_RESOLVE);
1378                 } else {
1379                         neigh_event_send(neigh, NULL);
1380                 }
1381         }
1382
1383 out:
1384         rcu_read_unlock();
1385         ip_rt_put(rt);
1386         return rc;
1387 }
1388
1389 /**
1390  * make_cm_node - create a new instance of a cm node
1391  */
1392 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1393                                         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1394                                         struct nes_cm_listener *listener)
1395 {
1396         struct nes_cm_node *cm_node;
1397         struct timespec ts;
1398         int oldarpindex = 0;
1399         int arpindex = 0;
1400         struct nes_device *nesdev;
1401         struct nes_adapter *nesadapter;
1402
1403         /* create an hte and cm_node for this instance */
1404         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1405         if (!cm_node)
1406                 return NULL;
1407
1408         /* set our node specific transport info */
1409         cm_node->loc_addr = cm_info->loc_addr;
1410         cm_node->rem_addr = cm_info->rem_addr;
1411         cm_node->loc_port = cm_info->loc_port;
1412         cm_node->rem_port = cm_info->rem_port;
1413
1414         cm_node->mpa_frame_rev = mpa_version;
1415         cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1416         cm_node->ird_size = IETF_NO_IRD_ORD;
1417         cm_node->ord_size = IETF_NO_IRD_ORD;
1418
1419         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1420                   &cm_node->loc_addr, cm_node->loc_port,
1421                   &cm_node->rem_addr, cm_node->rem_port);
1422         cm_node->listener = listener;
1423         cm_node->netdev = nesvnic->netdev;
1424         cm_node->cm_id = cm_info->cm_id;
1425         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1426
1427         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1428                   cm_node->cm_id);
1429
1430         spin_lock_init(&cm_node->retrans_list_lock);
1431
1432         cm_node->loopbackpartner = NULL;
1433         atomic_set(&cm_node->ref_count, 1);
1434         /* associate our parent CM core */
1435         cm_node->cm_core = cm_core;
1436         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1437         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1438         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1439                                      NES_CM_DEFAULT_RCV_WND_SCALE;
1440         ts = current_kernel_time();
1441         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1442         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1443                                  sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1444         cm_node->tcp_cntxt.rcv_nxt = 0;
1445         /* get a unique session ID , add thread_id to an upcounter to handle race */
1446         atomic_inc(&cm_core->node_cnt);
1447         cm_node->conn_type = cm_info->conn_type;
1448         cm_node->apbvt_set = 0;
1449         cm_node->accept_pend = 0;
1450
1451         cm_node->nesvnic = nesvnic;
1452         /* get some device handles, for arp lookup */
1453         nesdev = nesvnic->nesdev;
1454         nesadapter = nesdev->nesadapter;
1455
1456         cm_node->loopbackpartner = NULL;
1457
1458         /* get the mac addr for the remote node */
1459         if (ipv4_is_loopback(htonl(cm_node->rem_addr))) {
1460                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1461         } else {
1462                 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1463                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
1464         }
1465         if (arpindex < 0) {
1466                 kfree(cm_node);
1467                 return NULL;
1468         }
1469
1470         /* copy the mac addr to node context */
1471         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1472         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1473                   cm_node->rem_mac);
1474
1475         add_hte_node(cm_core, cm_node);
1476         atomic_inc(&cm_nodes_created);
1477
1478         return cm_node;
1479 }
1480
1481
1482 /**
1483  * add_ref_cm_node - destroy an instance of a cm node
1484  */
1485 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1486 {
1487         atomic_inc(&cm_node->ref_count);
1488         return 0;
1489 }
1490
1491
1492 /**
1493  * rem_ref_cm_node - destroy an instance of a cm node
1494  */
1495 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1496                            struct nes_cm_node *cm_node)
1497 {
1498         unsigned long flags;
1499         struct nes_qp *nesqp;
1500
1501         if (!cm_node)
1502                 return -EINVAL;
1503
1504         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1505         if (atomic_dec_return(&cm_node->ref_count)) {
1506                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1507                 return 0;
1508         }
1509         list_del(&cm_node->list);
1510         atomic_dec(&cm_core->ht_node_cnt);
1511         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1512
1513         /* if the node is destroyed before connection was accelerated */
1514         if (!cm_node->accelerated && cm_node->accept_pend) {
1515                 BUG_ON(!cm_node->listener);
1516                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1517                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1518         }
1519         WARN_ON(cm_node->send_entry);
1520         if (cm_node->recv_entry)
1521                 handle_recv_entry(cm_node, 0);
1522         if (cm_node->listener) {
1523                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1524         } else {
1525                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1526                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1527                                          PCI_FUNC(
1528                                                  cm_node->nesvnic->nesdev->pcidev->devfn),
1529                                          NES_MANAGE_APBVT_DEL);
1530                 }
1531         }
1532
1533         atomic_dec(&cm_core->node_cnt);
1534         atomic_inc(&cm_nodes_destroyed);
1535         nesqp = cm_node->nesqp;
1536         if (nesqp) {
1537                 nesqp->cm_node = NULL;
1538                 nes_rem_ref(&nesqp->ibqp);
1539                 cm_node->nesqp = NULL;
1540         }
1541
1542         kfree(cm_node);
1543         return 0;
1544 }
1545
1546 /**
1547  * process_options
1548  */
1549 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1550                            u32 optionsize, u32 syn_packet)
1551 {
1552         u32 tmp;
1553         u32 offset = 0;
1554         union all_known_options *all_options;
1555         char got_mss_option = 0;
1556
1557         while (offset < optionsize) {
1558                 all_options = (union all_known_options *)(optionsloc + offset);
1559                 switch (all_options->as_base.optionnum) {
1560                 case OPTION_NUMBER_END:
1561                         offset = optionsize;
1562                         break;
1563                 case OPTION_NUMBER_NONE:
1564                         offset += 1;
1565                         continue;
1566                 case OPTION_NUMBER_MSS:
1567                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1568                                   "Size: %d\n", __func__,
1569                                   all_options->as_mss.length, offset, optionsize);
1570                         got_mss_option = 1;
1571                         if (all_options->as_mss.length != 4) {
1572                                 return 1;
1573                         } else {
1574                                 tmp = ntohs(all_options->as_mss.mss);
1575                                 if (tmp > 0 && tmp <
1576                                     cm_node->tcp_cntxt.mss)
1577                                         cm_node->tcp_cntxt.mss = tmp;
1578                         }
1579                         break;
1580                 case OPTION_NUMBER_WINDOW_SCALE:
1581                         cm_node->tcp_cntxt.snd_wscale =
1582                                 all_options->as_windowscale.shiftcount;
1583                         break;
1584                 default:
1585                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1586                                   all_options->as_base.optionnum);
1587                         break;
1588                 }
1589                 offset += all_options->as_base.length;
1590         }
1591         if ((!got_mss_option) && (syn_packet))
1592                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1593         return 0;
1594 }
1595
1596 static void drop_packet(struct sk_buff *skb)
1597 {
1598         atomic_inc(&cm_accel_dropped_pkts);
1599         dev_kfree_skb_any(skb);
1600 }
1601
1602 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1603 {
1604         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1605                   "refcnt=%d\n", cm_node, cm_node->state,
1606                   atomic_read(&cm_node->ref_count));
1607         switch (cm_node->state) {
1608         case NES_CM_STATE_SYN_RCVD:
1609         case NES_CM_STATE_SYN_SENT:
1610         case NES_CM_STATE_ESTABLISHED:
1611         case NES_CM_STATE_MPAREJ_RCVD:
1612                 cm_node->tcp_cntxt.rcv_nxt++;
1613                 cleanup_retrans_entry(cm_node);
1614                 cm_node->state = NES_CM_STATE_LAST_ACK;
1615                 send_fin(cm_node, NULL);
1616                 break;
1617         case NES_CM_STATE_MPAREQ_SENT:
1618                 create_event(cm_node, NES_CM_EVENT_ABORTED);
1619                 cm_node->tcp_cntxt.rcv_nxt++;
1620                 cleanup_retrans_entry(cm_node);
1621                 cm_node->state = NES_CM_STATE_CLOSED;
1622                 add_ref_cm_node(cm_node);
1623                 send_reset(cm_node, NULL);
1624                 break;
1625         case NES_CM_STATE_FIN_WAIT1:
1626                 cm_node->tcp_cntxt.rcv_nxt++;
1627                 cleanup_retrans_entry(cm_node);
1628                 cm_node->state = NES_CM_STATE_CLOSING;
1629                 send_ack(cm_node, NULL);
1630                 /* Wait for ACK as this is simultaneous close..
1631                 * After we receive ACK, do not send anything..
1632                 * Just rm the node.. Done.. */
1633                 break;
1634         case NES_CM_STATE_FIN_WAIT2:
1635                 cm_node->tcp_cntxt.rcv_nxt++;
1636                 cleanup_retrans_entry(cm_node);
1637                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1638                 send_ack(cm_node, NULL);
1639                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1640                 break;
1641         case NES_CM_STATE_TIME_WAIT:
1642                 cm_node->tcp_cntxt.rcv_nxt++;
1643                 cleanup_retrans_entry(cm_node);
1644                 cm_node->state = NES_CM_STATE_CLOSED;
1645                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1646                 break;
1647         case NES_CM_STATE_TSA:
1648         default:
1649                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1650                         cm_node, cm_node->state);
1651                 break;
1652         }
1653 }
1654
1655
1656 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1657         struct tcphdr *tcph)
1658 {
1659
1660         int     reset = 0;      /* whether to send reset in case of err.. */
1661         atomic_inc(&cm_resets_recvd);
1662         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1663                         " refcnt=%d\n", cm_node, cm_node->state,
1664                         atomic_read(&cm_node->ref_count));
1665         cleanup_retrans_entry(cm_node);
1666         switch (cm_node->state) {
1667         case NES_CM_STATE_SYN_SENT:
1668         case NES_CM_STATE_MPAREQ_SENT:
1669                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1670                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1671                         cm_node->listener, cm_node->state);
1672                 switch (cm_node->mpa_frame_rev) {
1673                 case IETF_MPA_V2:
1674                         cm_node->mpa_frame_rev = IETF_MPA_V1;
1675                         /* send a syn and goto syn sent state */
1676                         cm_node->state = NES_CM_STATE_SYN_SENT;
1677                         if (send_syn(cm_node, 0, NULL)) {
1678                                 active_open_err(cm_node, skb, reset);
1679                         }
1680                         break;
1681                 case IETF_MPA_V1:
1682                 default:
1683                         active_open_err(cm_node, skb, reset);
1684                         break;
1685                 }
1686                 break;
1687         case NES_CM_STATE_MPAREQ_RCVD:
1688                 atomic_inc(&cm_node->passive_state);
1689                 dev_kfree_skb_any(skb);
1690                 break;
1691         case NES_CM_STATE_ESTABLISHED:
1692         case NES_CM_STATE_SYN_RCVD:
1693         case NES_CM_STATE_LISTENING:
1694                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1695                 passive_open_err(cm_node, skb, reset);
1696                 break;
1697         case NES_CM_STATE_TSA:
1698                 active_open_err(cm_node, skb, reset);
1699                 break;
1700         case NES_CM_STATE_CLOSED:
1701                 drop_packet(skb);
1702                 break;
1703         case NES_CM_STATE_FIN_WAIT2:
1704         case NES_CM_STATE_FIN_WAIT1:
1705         case NES_CM_STATE_LAST_ACK:
1706                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1707         case NES_CM_STATE_TIME_WAIT:
1708                 cm_node->state = NES_CM_STATE_CLOSED;
1709                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1710                 drop_packet(skb);
1711                 break;
1712         default:
1713                 drop_packet(skb);
1714                 break;
1715         }
1716 }
1717
1718
1719 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1720 {
1721         int ret = 0;
1722         int datasize = skb->len;
1723         u8 *dataloc = skb->data;
1724
1725         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1726         u32 res_type;
1727
1728         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1729         if (ret) {
1730                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1731                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1732                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1733                                   "cm_node=%p listener=%p state=%d\n", __func__,
1734                                   __LINE__, cm_node, cm_node->listener,
1735                                   cm_node->state);
1736                         active_open_err(cm_node, skb, 1);
1737                 } else {
1738                         passive_open_err(cm_node, skb, 1);
1739                 }
1740                 return;
1741         }
1742
1743         switch (cm_node->state) {
1744         case NES_CM_STATE_ESTABLISHED:
1745                 if (res_type == NES_MPA_REQUEST_REJECT)
1746                         /*BIG problem as we are receiving the MPA.. So should
1747                          * not be REJECT.. This is Passive Open.. We can
1748                          * only receive it Reject for Active Open...*/
1749                         WARN_ON(1);
1750                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1751                 type = NES_CM_EVENT_MPA_REQ;
1752                 atomic_set(&cm_node->passive_state,
1753                            NES_PASSIVE_STATE_INDICATED);
1754                 break;
1755         case NES_CM_STATE_MPAREQ_SENT:
1756                 cleanup_retrans_entry(cm_node);
1757                 if (res_type == NES_MPA_REQUEST_REJECT) {
1758                         type = NES_CM_EVENT_MPA_REJECT;
1759                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1760                 } else {
1761                         type = NES_CM_EVENT_CONNECTED;
1762                         cm_node->state = NES_CM_STATE_TSA;
1763                 }
1764
1765                 break;
1766         default:
1767                 WARN_ON(1);
1768                 break;
1769         }
1770         dev_kfree_skb_any(skb);
1771         create_event(cm_node, type);
1772 }
1773
1774 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1775 {
1776         switch (cm_node->state) {
1777         case NES_CM_STATE_SYN_SENT:
1778         case NES_CM_STATE_MPAREQ_SENT:
1779                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1780                           "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1781                           cm_node->listener, cm_node->state);
1782                 active_open_err(cm_node, skb, 1);
1783                 break;
1784         case NES_CM_STATE_ESTABLISHED:
1785         case NES_CM_STATE_SYN_RCVD:
1786                 passive_open_err(cm_node, skb, 1);
1787                 break;
1788         case NES_CM_STATE_TSA:
1789         default:
1790                 drop_packet(skb);
1791         }
1792 }
1793
1794 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1795                      struct sk_buff *skb)
1796 {
1797         int err;
1798
1799         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1800         if (err)
1801                 active_open_err(cm_node, skb, 1);
1802
1803         return err;
1804 }
1805
1806 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1807                      struct sk_buff *skb)
1808 {
1809         int err = 0;
1810         u32 seq;
1811         u32 ack_seq;
1812         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1813         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1814         u32 rcv_wnd;
1815
1816         seq = ntohl(tcph->seq);
1817         ack_seq = ntohl(tcph->ack_seq);
1818         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1819         if (ack_seq != loc_seq_num)
1820                 err = 1;
1821         else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1822                 err = 1;
1823         if (err) {
1824                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1825                           "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1826                           cm_node->listener, cm_node->state);
1827                 indicate_pkt_err(cm_node, skb);
1828                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1829                           "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1830                           rcv_wnd);
1831         }
1832         return err;
1833 }
1834
1835 /*
1836  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1837  * is created with a listener or it may comein as rexmitted packet which in
1838  * that case will be just dropped.
1839  */
1840 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1841                            struct tcphdr *tcph)
1842 {
1843         int ret;
1844         u32 inc_sequence;
1845         int optionsize;
1846
1847         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1848         skb_trim(skb, 0);
1849         inc_sequence = ntohl(tcph->seq);
1850
1851         switch (cm_node->state) {
1852         case NES_CM_STATE_SYN_SENT:
1853         case NES_CM_STATE_MPAREQ_SENT:
1854                 /* Rcvd syn on active open connection*/
1855                 active_open_err(cm_node, skb, 1);
1856                 break;
1857         case NES_CM_STATE_LISTENING:
1858                 /* Passive OPEN */
1859                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1860                     cm_node->listener->backlog) {
1861                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1862                                   "pressure \n");
1863                         cm_backlog_drops++;
1864                         passive_open_err(cm_node, skb, 0);
1865                         break;
1866                 }
1867                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1868                                          1);
1869                 if (ret) {
1870                         passive_open_err(cm_node, skb, 0);
1871                         /* drop pkt */
1872                         break;
1873                 }
1874                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1875                 BUG_ON(cm_node->send_entry);
1876                 cm_node->accept_pend = 1;
1877                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1878
1879                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1880                 send_syn(cm_node, 1, skb);
1881                 break;
1882         case NES_CM_STATE_CLOSED:
1883                 cleanup_retrans_entry(cm_node);
1884                 add_ref_cm_node(cm_node);
1885                 send_reset(cm_node, skb);
1886                 break;
1887         case NES_CM_STATE_TSA:
1888         case NES_CM_STATE_ESTABLISHED:
1889         case NES_CM_STATE_FIN_WAIT1:
1890         case NES_CM_STATE_FIN_WAIT2:
1891         case NES_CM_STATE_MPAREQ_RCVD:
1892         case NES_CM_STATE_LAST_ACK:
1893         case NES_CM_STATE_CLOSING:
1894         case NES_CM_STATE_UNKNOWN:
1895         default:
1896                 drop_packet(skb);
1897                 break;
1898         }
1899 }
1900
1901 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1902                               struct tcphdr *tcph)
1903 {
1904         int ret;
1905         u32 inc_sequence;
1906         int optionsize;
1907
1908         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1909         skb_trim(skb, 0);
1910         inc_sequence = ntohl(tcph->seq);
1911         switch (cm_node->state) {
1912         case NES_CM_STATE_SYN_SENT:
1913                 cleanup_retrans_entry(cm_node);
1914                 /* active open */
1915                 if (check_syn(cm_node, tcph, skb))
1916                         return;
1917                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1918                 /* setup options */
1919                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1920                 if (ret) {
1921                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1922                                   cm_node);
1923                         break;
1924                 }
1925                 cleanup_retrans_entry(cm_node);
1926                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1927                 send_mpa_request(cm_node, skb);
1928                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1929                 break;
1930         case NES_CM_STATE_MPAREQ_RCVD:
1931                 /* passive open, so should not be here */
1932                 passive_open_err(cm_node, skb, 1);
1933                 break;
1934         case NES_CM_STATE_LISTENING:
1935                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1936                 cleanup_retrans_entry(cm_node);
1937                 cm_node->state = NES_CM_STATE_CLOSED;
1938                 send_reset(cm_node, skb);
1939                 break;
1940         case NES_CM_STATE_CLOSED:
1941                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1942                 cleanup_retrans_entry(cm_node);
1943                 add_ref_cm_node(cm_node);
1944                 send_reset(cm_node, skb);
1945                 break;
1946         case NES_CM_STATE_ESTABLISHED:
1947         case NES_CM_STATE_FIN_WAIT1:
1948         case NES_CM_STATE_FIN_WAIT2:
1949         case NES_CM_STATE_LAST_ACK:
1950         case NES_CM_STATE_TSA:
1951         case NES_CM_STATE_CLOSING:
1952         case NES_CM_STATE_UNKNOWN:
1953         case NES_CM_STATE_MPAREQ_SENT:
1954         default:
1955                 drop_packet(skb);
1956                 break;
1957         }
1958 }
1959
1960 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1961                           struct tcphdr *tcph)
1962 {
1963         int datasize = 0;
1964         u32 inc_sequence;
1965         int ret = 0;
1966         int optionsize;
1967
1968         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1969
1970         if (check_seq(cm_node, tcph, skb))
1971                 return -EINVAL;
1972
1973         skb_pull(skb, tcph->doff << 2);
1974         inc_sequence = ntohl(tcph->seq);
1975         datasize = skb->len;
1976         switch (cm_node->state) {
1977         case NES_CM_STATE_SYN_RCVD:
1978                 /* Passive OPEN */
1979                 cleanup_retrans_entry(cm_node);
1980                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1981                 if (ret)
1982                         break;
1983                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1984                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1985                 if (datasize) {
1986                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1987                         handle_rcv_mpa(cm_node, skb);
1988                 } else { /* rcvd ACK only */
1989                         dev_kfree_skb_any(skb);
1990                 }
1991                 break;
1992         case NES_CM_STATE_ESTABLISHED:
1993                 /* Passive OPEN */
1994                 cleanup_retrans_entry(cm_node);
1995                 if (datasize) {
1996                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1997                         handle_rcv_mpa(cm_node, skb);
1998                 } else {
1999                         drop_packet(skb);
2000                 }
2001                 break;
2002         case NES_CM_STATE_MPAREQ_SENT:
2003                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2004                 if (datasize) {
2005                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2006                         handle_rcv_mpa(cm_node, skb);
2007                 } else { /* Could be just an ack pkt.. */
2008                         dev_kfree_skb_any(skb);
2009                 }
2010                 break;
2011         case NES_CM_STATE_LISTENING:
2012                 cleanup_retrans_entry(cm_node);
2013                 cm_node->state = NES_CM_STATE_CLOSED;
2014                 send_reset(cm_node, skb);
2015                 break;
2016         case NES_CM_STATE_CLOSED:
2017                 cleanup_retrans_entry(cm_node);
2018                 add_ref_cm_node(cm_node);
2019                 send_reset(cm_node, skb);
2020                 break;
2021         case NES_CM_STATE_LAST_ACK:
2022         case NES_CM_STATE_CLOSING:
2023                 cleanup_retrans_entry(cm_node);
2024                 cm_node->state = NES_CM_STATE_CLOSED;
2025                 cm_node->cm_id->rem_ref(cm_node->cm_id);
2026                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2027                 drop_packet(skb);
2028                 break;
2029         case NES_CM_STATE_FIN_WAIT1:
2030                 cleanup_retrans_entry(cm_node);
2031                 drop_packet(skb);
2032                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
2033                 break;
2034         case NES_CM_STATE_SYN_SENT:
2035         case NES_CM_STATE_FIN_WAIT2:
2036         case NES_CM_STATE_TSA:
2037         case NES_CM_STATE_MPAREQ_RCVD:
2038         case NES_CM_STATE_UNKNOWN:
2039         default:
2040                 cleanup_retrans_entry(cm_node);
2041                 drop_packet(skb);
2042                 break;
2043         }
2044         return ret;
2045 }
2046
2047
2048
2049 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2050                               struct sk_buff *skb, int optionsize, int passive)
2051 {
2052         u8 *optionsloc = (u8 *)&tcph[1];
2053
2054         if (optionsize) {
2055                 if (process_options(cm_node, optionsloc, optionsize,
2056                                     (u32)tcph->syn)) {
2057                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2058                                   __func__, cm_node);
2059                         if (passive)
2060                                 passive_open_err(cm_node, skb, 1);
2061                         else
2062                                 active_open_err(cm_node, skb, 1);
2063                         return 1;
2064                 }
2065         }
2066
2067         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2068                                      cm_node->tcp_cntxt.snd_wscale;
2069
2070         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2071                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2072         return 0;
2073 }
2074
2075 /*
2076  * active_open_err() will send reset() if flag set..
2077  * It will also send ABORT event.
2078  */
2079 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2080                             int reset)
2081 {
2082         cleanup_retrans_entry(cm_node);
2083         if (reset) {
2084                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2085                           "state=%d\n", cm_node, cm_node->state);
2086                 add_ref_cm_node(cm_node);
2087                 send_reset(cm_node, skb);
2088         } else {
2089                 dev_kfree_skb_any(skb);
2090         }
2091
2092         cm_node->state = NES_CM_STATE_CLOSED;
2093         create_event(cm_node, NES_CM_EVENT_ABORTED);
2094 }
2095
2096 /*
2097  * passive_open_err() will either do a reset() or will free up the skb and
2098  * remove the cm_node.
2099  */
2100 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2101                              int reset)
2102 {
2103         cleanup_retrans_entry(cm_node);
2104         cm_node->state = NES_CM_STATE_CLOSED;
2105         if (reset) {
2106                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2107                           "cm_node=%p state =%d\n", cm_node, cm_node->state);
2108                 send_reset(cm_node, skb);
2109         } else {
2110                 dev_kfree_skb_any(skb);
2111                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2112         }
2113 }
2114
2115 /*
2116  * free_retrans_entry() routines assumes that the retrans_list_lock has
2117  * been acquired before calling.
2118  */
2119 static void free_retrans_entry(struct nes_cm_node *cm_node)
2120 {
2121         struct nes_timer_entry *send_entry;
2122
2123         send_entry = cm_node->send_entry;
2124         if (send_entry) {
2125                 cm_node->send_entry = NULL;
2126                 dev_kfree_skb_any(send_entry->skb);
2127                 kfree(send_entry);
2128                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2129         }
2130 }
2131
2132 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2133 {
2134         unsigned long flags;
2135
2136         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2137         free_retrans_entry(cm_node);
2138         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2139 }
2140
2141 /**
2142  * process_packet
2143  * Returns skb if to be freed, else it will return NULL if already used..
2144  */
2145 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2146                            struct nes_cm_core *cm_core)
2147 {
2148         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2149         struct tcphdr *tcph = tcp_hdr(skb);
2150         u32 fin_set = 0;
2151         int ret = 0;
2152
2153         skb_pull(skb, ip_hdr(skb)->ihl << 2);
2154
2155         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2156                   "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2157                   tcph->ack, tcph->rst, tcph->fin);
2158
2159         if (tcph->rst) {
2160                 pkt_type = NES_PKT_TYPE_RST;
2161         } else if (tcph->syn) {
2162                 pkt_type = NES_PKT_TYPE_SYN;
2163                 if (tcph->ack)
2164                         pkt_type = NES_PKT_TYPE_SYNACK;
2165         } else if (tcph->ack) {
2166                 pkt_type = NES_PKT_TYPE_ACK;
2167         }
2168         if (tcph->fin)
2169                 fin_set = 1;
2170
2171         switch (pkt_type) {
2172         case NES_PKT_TYPE_SYN:
2173                 handle_syn_pkt(cm_node, skb, tcph);
2174                 break;
2175         case NES_PKT_TYPE_SYNACK:
2176                 handle_synack_pkt(cm_node, skb, tcph);
2177                 break;
2178         case NES_PKT_TYPE_ACK:
2179                 ret = handle_ack_pkt(cm_node, skb, tcph);
2180                 if (fin_set && !ret)
2181                         handle_fin_pkt(cm_node);
2182                 break;
2183         case NES_PKT_TYPE_RST:
2184                 handle_rst_pkt(cm_node, skb, tcph);
2185                 break;
2186         default:
2187                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2188                         handle_fin_pkt(cm_node);
2189                 drop_packet(skb);
2190                 break;
2191         }
2192 }
2193
2194 /**
2195  * mini_cm_listen - create a listen node with params
2196  */
2197 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2198                                               struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2199 {
2200         struct nes_cm_listener *listener;
2201         unsigned long flags;
2202
2203         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2204                   cm_info->loc_addr, cm_info->loc_port);
2205
2206         /* cannot have multiple matching listeners */
2207         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
2208                                  htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
2209         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2210                 /* find automatically incs ref count ??? */
2211                 atomic_dec(&listener->ref_count);
2212                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2213                 return NULL;
2214         }
2215
2216         if (!listener) {
2217                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2218                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2219                 if (!listener) {
2220                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
2221                         return NULL;
2222                 }
2223
2224                 listener->loc_addr = htonl(cm_info->loc_addr);
2225                 listener->loc_port = htons(cm_info->loc_port);
2226                 listener->reused_node = 0;
2227
2228                 atomic_set(&listener->ref_count, 1);
2229         }
2230         /* pasive case */
2231         /* find already inc'ed the ref count */
2232         else {
2233                 listener->reused_node = 1;
2234         }
2235
2236         listener->cm_id = cm_info->cm_id;
2237         atomic_set(&listener->pend_accepts_cnt, 0);
2238         listener->cm_core = cm_core;
2239         listener->nesvnic = nesvnic;
2240         atomic_inc(&cm_core->node_cnt);
2241
2242         listener->conn_type = cm_info->conn_type;
2243         listener->backlog = cm_info->backlog;
2244         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2245
2246         if (!listener->reused_node) {
2247                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2248                 list_add(&listener->list, &cm_core->listen_list.list);
2249                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2250                 atomic_inc(&cm_core->listen_node_cnt);
2251         }
2252
2253         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2254                   " listener = %p, backlog = %d, cm_id = %p.\n",
2255                   cm_info->loc_addr, cm_info->loc_port,
2256                   listener, listener->backlog, listener->cm_id);
2257
2258         return listener;
2259 }
2260
2261
2262 /**
2263  * mini_cm_connect - make a connection node with params
2264  */
2265 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2266                                            struct nes_vnic *nesvnic, u16 private_data_len,
2267                                            void *private_data, struct nes_cm_info *cm_info)
2268 {
2269         int ret = 0;
2270         struct nes_cm_node *cm_node;
2271         struct nes_cm_listener *loopbackremotelistener;
2272         struct nes_cm_node *loopbackremotenode;
2273         struct nes_cm_info loopback_cm_info;
2274         u8 *start_buff;
2275
2276         /* create a CM connection node */
2277         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2278         if (!cm_node)
2279                 return NULL;
2280
2281         /* set our node side to client (active) side */
2282         cm_node->tcp_cntxt.client = 1;
2283         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2284
2285         if (cm_info->loc_addr == cm_info->rem_addr) {
2286                 loopbackremotelistener = find_listener(cm_core,
2287                                                        ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2288                                                        NES_CM_LISTENER_ACTIVE_STATE);
2289                 if (loopbackremotelistener == NULL) {
2290                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2291                 } else {
2292                         loopback_cm_info = *cm_info;
2293                         loopback_cm_info.loc_port = cm_info->rem_port;
2294                         loopback_cm_info.rem_port = cm_info->loc_port;
2295                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2296                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2297                                                           &loopback_cm_info, loopbackremotelistener);
2298                         if (!loopbackremotenode) {
2299                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2300                                 return NULL;
2301                         }
2302                         atomic_inc(&cm_loopbacks);
2303                         loopbackremotenode->loopbackpartner = cm_node;
2304                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2305                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2306                         cm_node->loopbackpartner = loopbackremotenode;
2307                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2308                                private_data_len);
2309                         loopbackremotenode->mpa_frame_size = private_data_len;
2310
2311                         /* we are done handling this state. */
2312                         /* set node to a TSA state */
2313                         cm_node->state = NES_CM_STATE_TSA;
2314                         cm_node->tcp_cntxt.rcv_nxt =
2315                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2316                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2317                                 cm_node->tcp_cntxt.loc_seq_num;
2318                         cm_node->tcp_cntxt.max_snd_wnd =
2319                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2320                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2321                                 cm_node->tcp_cntxt.rcv_wnd;
2322                         cm_node->tcp_cntxt.snd_wnd =
2323                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2324                         loopbackremotenode->tcp_cntxt.snd_wnd =
2325                                 cm_node->tcp_cntxt.rcv_wnd;
2326                         cm_node->tcp_cntxt.snd_wscale =
2327                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2328                         loopbackremotenode->tcp_cntxt.snd_wscale =
2329                                 cm_node->tcp_cntxt.rcv_wscale;
2330                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2331                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2332                 }
2333                 return cm_node;
2334         }
2335
2336         start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2337         cm_node->mpa_frame_size = private_data_len;
2338
2339         memcpy(start_buff, private_data, private_data_len);
2340
2341         /* send a syn and goto syn sent state */
2342         cm_node->state = NES_CM_STATE_SYN_SENT;
2343         ret = send_syn(cm_node, 0, NULL);
2344
2345         if (ret) {
2346                 /* error in sending the syn free up the cm_node struct */
2347                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2348                           "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2349                           cm_node->rem_addr, cm_node->rem_port, cm_node,
2350                           cm_node->cm_id);
2351                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2352                 cm_node = NULL;
2353         }
2354
2355         if (cm_node) {
2356                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2357                           "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2358                           cm_node->rem_addr, cm_node->rem_port, cm_node,
2359                           cm_node->cm_id);
2360         }
2361
2362         return cm_node;
2363 }
2364
2365
2366 /**
2367  * mini_cm_accept - accept a connection
2368  * This function is never called
2369  */
2370 static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2371 {
2372         return 0;
2373 }
2374
2375
2376 /**
2377  * mini_cm_reject - reject and teardown a connection
2378  */
2379 static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2380 {
2381         int ret = 0;
2382         int err = 0;
2383         int passive_state;
2384         struct nes_cm_event event;
2385         struct iw_cm_id *cm_id = cm_node->cm_id;
2386         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2387
2388         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2389                   __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2390
2391         if (cm_node->tcp_cntxt.client)
2392                 return ret;
2393         cleanup_retrans_entry(cm_node);
2394
2395         if (!loopback) {
2396                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2397                 if (passive_state == NES_SEND_RESET_EVENT) {
2398                         cm_node->state = NES_CM_STATE_CLOSED;
2399                         rem_ref_cm_node(cm_core, cm_node);
2400                 } else {
2401                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2402                                 rem_ref_cm_node(cm_core, cm_node);
2403                         } else {
2404                                 ret = send_mpa_reject(cm_node);
2405                                 if (ret) {
2406                                         cm_node->state = NES_CM_STATE_CLOSED;
2407                                         err = send_reset(cm_node, NULL);
2408                                         if (err)
2409                                                 WARN_ON(1);
2410                                 } else {
2411                                         cm_id->add_ref(cm_id);
2412                                 }
2413                         }
2414                 }
2415         } else {
2416                 cm_node->cm_id = NULL;
2417                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2418                         rem_ref_cm_node(cm_core, cm_node);
2419                         rem_ref_cm_node(cm_core, loopback);
2420                 } else {
2421                         event.cm_node = loopback;
2422                         event.cm_info.rem_addr = loopback->rem_addr;
2423                         event.cm_info.loc_addr = loopback->loc_addr;
2424                         event.cm_info.rem_port = loopback->rem_port;
2425                         event.cm_info.loc_port = loopback->loc_port;
2426                         event.cm_info.cm_id = loopback->cm_id;
2427                         cm_event_mpa_reject(&event);
2428                         rem_ref_cm_node(cm_core, cm_node);
2429                         loopback->state = NES_CM_STATE_CLOSING;
2430
2431                         cm_id = loopback->cm_id;
2432                         rem_ref_cm_node(cm_core, loopback);
2433                         cm_id->rem_ref(cm_id);
2434                 }
2435         }
2436
2437         return ret;
2438 }
2439
2440
2441 /**
2442  * mini_cm_close
2443  */
2444 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2445 {
2446         int ret = 0;
2447
2448         if (!cm_core || !cm_node)
2449                 return -EINVAL;
2450
2451         switch (cm_node->state) {
2452         case NES_CM_STATE_SYN_RCVD:
2453         case NES_CM_STATE_SYN_SENT:
2454         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2455         case NES_CM_STATE_ESTABLISHED:
2456         case NES_CM_STATE_ACCEPTING:
2457         case NES_CM_STATE_MPAREQ_SENT:
2458         case NES_CM_STATE_MPAREQ_RCVD:
2459                 cleanup_retrans_entry(cm_node);
2460                 send_reset(cm_node, NULL);
2461                 break;
2462         case NES_CM_STATE_CLOSE_WAIT:
2463                 cm_node->state = NES_CM_STATE_LAST_ACK;
2464                 send_fin(cm_node, NULL);
2465                 break;
2466         case NES_CM_STATE_FIN_WAIT1:
2467         case NES_CM_STATE_FIN_WAIT2:
2468         case NES_CM_STATE_LAST_ACK:
2469         case NES_CM_STATE_TIME_WAIT:
2470         case NES_CM_STATE_CLOSING:
2471                 ret = -1;
2472                 break;
2473         case NES_CM_STATE_LISTENING:
2474                 cleanup_retrans_entry(cm_node);
2475                 send_reset(cm_node, NULL);
2476                 break;
2477         case NES_CM_STATE_MPAREJ_RCVD:
2478         case NES_CM_STATE_UNKNOWN:
2479         case NES_CM_STATE_INITED:
2480         case NES_CM_STATE_CLOSED:
2481         case NES_CM_STATE_LISTENER_DESTROYED:
2482                 ret = rem_ref_cm_node(cm_core, cm_node);
2483                 break;
2484         case NES_CM_STATE_TSA:
2485                 if (cm_node->send_entry)
2486                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2487                                "send_entry=%p\n", cm_node->send_entry);
2488                 ret = rem_ref_cm_node(cm_core, cm_node);
2489                 break;
2490         }
2491         return ret;
2492 }
2493
2494
2495 /**
2496  * recv_pkt - recv an ETHERNET packet, and process it through CM
2497  * node state machine
2498  */
2499 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2500                             struct nes_vnic *nesvnic, struct sk_buff *skb)
2501 {
2502         struct nes_cm_node *cm_node = NULL;
2503         struct nes_cm_listener *listener = NULL;
2504         struct iphdr *iph;
2505         struct tcphdr *tcph;
2506         struct nes_cm_info nfo;
2507         int skb_handled = 1;
2508         __be32 tmp_daddr, tmp_saddr;
2509
2510         if (!skb)
2511                 return 0;
2512         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2513                 return 0;
2514
2515         iph = (struct iphdr *)skb->data;
2516         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2517
2518         nfo.loc_addr = ntohl(iph->daddr);
2519         nfo.loc_port = ntohs(tcph->dest);
2520         nfo.rem_addr = ntohl(iph->saddr);
2521         nfo.rem_port = ntohs(tcph->source);
2522
2523         tmp_daddr = cpu_to_be32(iph->daddr);
2524         tmp_saddr = cpu_to_be32(iph->saddr);
2525
2526         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2527                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2528
2529         do {
2530                 cm_node = find_node(cm_core,
2531                                     nfo.rem_port, nfo.rem_addr,
2532                                     nfo.loc_port, nfo.loc_addr);
2533
2534                 if (!cm_node) {
2535                         /* Only type of packet accepted are for */
2536                         /* the PASSIVE open (syn only) */
2537                         if ((!tcph->syn) || (tcph->ack)) {
2538                                 skb_handled = 0;
2539                                 break;
2540                         }
2541                         listener = find_listener(cm_core, nfo.loc_addr,
2542                                                  nfo.loc_port,
2543                                                  NES_CM_LISTENER_ACTIVE_STATE);
2544                         if (!listener) {
2545                                 nfo.cm_id = NULL;
2546                                 nfo.conn_type = 0;
2547                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2548                                 skb_handled = 0;
2549                                 break;
2550                         }
2551                         nfo.cm_id = listener->cm_id;
2552                         nfo.conn_type = listener->conn_type;
2553                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2554                                                listener);
2555                         if (!cm_node) {
2556                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2557                                           "node\n");
2558                                 cm_packets_dropped++;
2559                                 atomic_dec(&listener->ref_count);
2560                                 dev_kfree_skb_any(skb);
2561                                 break;
2562                         }
2563                         if (!tcph->rst && !tcph->fin) {
2564                                 cm_node->state = NES_CM_STATE_LISTENING;
2565                         } else {
2566                                 cm_packets_dropped++;
2567                                 rem_ref_cm_node(cm_core, cm_node);
2568                                 dev_kfree_skb_any(skb);
2569                                 break;
2570                         }
2571                         add_ref_cm_node(cm_node);
2572                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2573                         if (cm_node->nesqp->pau_mode)
2574                                 nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2575                         else {
2576                                 rem_ref_cm_node(cm_core, cm_node);
2577                                 atomic_inc(&cm_accel_dropped_pkts);
2578                                 dev_kfree_skb_any(skb);
2579                         }
2580                         break;
2581                 }
2582                 skb_reset_network_header(skb);
2583                 skb_set_transport_header(skb, sizeof(*tcph));
2584                 skb->len = ntohs(iph->tot_len);
2585                 process_packet(cm_node, skb, cm_core);
2586                 rem_ref_cm_node(cm_core, cm_node);
2587         } while (0);
2588         return skb_handled;
2589 }
2590
2591
2592 /**
2593  * nes_cm_alloc_core - allocate a top level instance of a cm core
2594  */
2595 static struct nes_cm_core *nes_cm_alloc_core(void)
2596 {
2597         struct nes_cm_core *cm_core;
2598
2599         /* setup the CM core */
2600         /* alloc top level core control structure */
2601         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2602         if (!cm_core)
2603                 return NULL;
2604
2605         INIT_LIST_HEAD(&cm_core->connected_nodes);
2606         init_timer(&cm_core->tcp_timer);
2607         cm_core->tcp_timer.function = nes_cm_timer_tick;
2608
2609         cm_core->mtu = NES_CM_DEFAULT_MTU;
2610         cm_core->state = NES_CM_STATE_INITED;
2611         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2612
2613         atomic_set(&cm_core->events_posted, 0);
2614
2615         cm_core->api = &nes_cm_api;
2616
2617         spin_lock_init(&cm_core->ht_lock);
2618         spin_lock_init(&cm_core->listen_list_lock);
2619
2620         INIT_LIST_HEAD(&cm_core->listen_list.list);
2621
2622         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2623
2624         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2625         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2626         cm_core->post_event = nes_cm_post_event;
2627         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2628         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2629
2630         print_core(cm_core);
2631         return cm_core;
2632 }
2633
2634
2635 /**
2636  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2637  */
2638 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2639 {
2640         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2641
2642         if (!cm_core)
2643                 return -EINVAL;
2644
2645         barrier();
2646
2647         if (timer_pending(&cm_core->tcp_timer))
2648                 del_timer(&cm_core->tcp_timer);
2649
2650         destroy_workqueue(cm_core->event_wq);
2651         destroy_workqueue(cm_core->disconn_wq);
2652         nes_debug(NES_DBG_CM, "\n");
2653         kfree(cm_core);
2654
2655         return 0;
2656 }
2657
2658
2659 /**
2660  * mini_cm_get
2661  */
2662 static int mini_cm_get(struct nes_cm_core *cm_core)
2663 {
2664         return cm_core->state;
2665 }
2666
2667
2668 /**
2669  * mini_cm_set
2670  */
2671 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2672 {
2673         int ret = 0;
2674
2675         switch (type) {
2676         case NES_CM_SET_PKT_SIZE:
2677                 cm_core->mtu = value;
2678                 break;
2679         case NES_CM_SET_FREE_PKT_Q_SIZE:
2680                 cm_core->free_tx_pkt_max = value;
2681                 break;
2682         default:
2683                 /* unknown set option */
2684                 ret = -EINVAL;
2685         }
2686
2687         return ret;
2688 }
2689
2690
2691 /**
2692  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2693  * successfully exchanged when this is called
2694  */
2695 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2696 {
2697         int ret = 0;
2698
2699         if (!nesqp)
2700                 return -EINVAL;
2701
2702         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2703                                                   NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2704                                                   NES_QPCONTEXT_MISC_DROS);
2705
2706         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2707                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2708
2709         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2710
2711         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2712
2713         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2714                 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2715
2716         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2717                 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2718                 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2719
2720         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2721                 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2722                 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2723
2724         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2725         nesqp->nesqp_context->ts_recent = 0;
2726         nesqp->nesqp_context->ts_age = 0;
2727         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2728         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2729         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2730         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2731                                                     cm_node->tcp_cntxt.rcv_wscale);
2732         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2733         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2734         nesqp->nesqp_context->srtt = 0;
2735         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2736         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2737         nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2738         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2739         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2740         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2741
2742         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2743                   " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2744                   nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2745                   le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2746                   cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2747                   le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2748                   le32_to_cpu(nesqp->nesqp_context->misc));
2749         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2750         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2751         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2752
2753         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2754         cm_node->state = NES_CM_STATE_TSA;
2755
2756         return ret;
2757 }
2758
2759
2760 /**
2761  * nes_cm_disconn
2762  */
2763 int nes_cm_disconn(struct nes_qp *nesqp)
2764 {
2765         struct disconn_work *work;
2766
2767         work = kzalloc(sizeof *work, GFP_ATOMIC);
2768         if (!work)
2769                 return -ENOMEM;  /* Timer will clean up */
2770
2771         nes_add_ref(&nesqp->ibqp);
2772         work->nesqp = nesqp;
2773         INIT_WORK(&work->work, nes_disconnect_worker);
2774         queue_work(g_cm_core->disconn_wq, &work->work);
2775         return 0;
2776 }
2777
2778
2779 /**
2780  * nes_disconnect_worker
2781  */
2782 static void nes_disconnect_worker(struct work_struct *work)
2783 {
2784         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2785         struct nes_qp *nesqp = dwork->nesqp;
2786
2787         kfree(dwork);
2788         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2789                   nesqp->last_aeq, nesqp->hwqp.qp_id);
2790         nes_cm_disconn_true(nesqp);
2791         nes_rem_ref(&nesqp->ibqp);
2792 }
2793
2794
2795 /**
2796  * nes_cm_disconn_true
2797  */
2798 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2799 {
2800         unsigned long flags;
2801         int ret = 0;
2802         struct iw_cm_id *cm_id;
2803         struct iw_cm_event cm_event;
2804         struct nes_vnic *nesvnic;
2805         u16 last_ae;
2806         u8 original_hw_tcp_state;
2807         u8 original_ibqp_state;
2808         int disconn_status = 0;
2809         int issue_disconn = 0;
2810         int issue_close = 0;
2811         int issue_flush = 0;
2812         u32 flush_q = NES_CQP_FLUSH_RQ;
2813         struct ib_event ibevent;
2814
2815         if (!nesqp) {
2816                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2817                 return -1;
2818         }
2819
2820         spin_lock_irqsave(&nesqp->lock, flags);
2821         cm_id = nesqp->cm_id;
2822         /* make sure we havent already closed this connection */
2823         if (!cm_id) {
2824                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2825                           nesqp->hwqp.qp_id);
2826                 spin_unlock_irqrestore(&nesqp->lock, flags);
2827                 return -1;
2828         }
2829
2830         nesvnic = to_nesvnic(nesqp->ibqp.device);
2831         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2832
2833         original_hw_tcp_state = nesqp->hw_tcp_state;
2834         original_ibqp_state = nesqp->ibqp_state;
2835         last_ae = nesqp->last_aeq;
2836
2837         if (nesqp->term_flags) {
2838                 issue_disconn = 1;
2839                 issue_close = 1;
2840                 nesqp->cm_id = NULL;
2841                 del_timer(&nesqp->terminate_timer);
2842                 if (nesqp->flush_issued == 0) {
2843                         nesqp->flush_issued = 1;
2844                         issue_flush = 1;
2845                 }
2846         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2847                         ((original_ibqp_state == IB_QPS_RTS) &&
2848                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2849                 issue_disconn = 1;
2850                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2851                         disconn_status = -ECONNRESET;
2852         }
2853
2854         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2855                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2856                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2857                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2858                 issue_close = 1;
2859                 nesqp->cm_id = NULL;
2860                 if (nesqp->flush_issued == 0) {
2861                         nesqp->flush_issued = 1;
2862                         issue_flush = 1;
2863                 }
2864         }
2865
2866         spin_unlock_irqrestore(&nesqp->lock, flags);
2867
2868         if ((issue_flush) && (nesqp->destroyed == 0)) {
2869                 /* Flush the queue(s) */
2870                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2871                         flush_q |= NES_CQP_FLUSH_SQ;
2872                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2873
2874                 if (nesqp->term_flags) {
2875                         ibevent.device = nesqp->ibqp.device;
2876                         ibevent.event = nesqp->terminate_eventtype;
2877                         ibevent.element.qp = &nesqp->ibqp;
2878                         nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2879                 }
2880         }
2881
2882         if ((cm_id) && (cm_id->event_handler)) {
2883                 if (issue_disconn) {
2884                         atomic_inc(&cm_disconnects);
2885                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2886                         cm_event.status = disconn_status;
2887                         cm_event.local_addr = cm_id->local_addr;
2888                         cm_event.remote_addr = cm_id->remote_addr;
2889                         cm_event.private_data = NULL;
2890                         cm_event.private_data_len = 0;
2891
2892                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2893                                   " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2894                                   "cm_id = %p, refcount = %u.\n",
2895                                   nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2896                                   nesqp->hwqp.sq_tail, cm_id,
2897                                   atomic_read(&nesqp->refcount));
2898
2899                         ret = cm_id->event_handler(cm_id, &cm_event);
2900                         if (ret)
2901                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2902                                           "returned, ret=%d\n", ret);
2903                 }
2904
2905                 if (issue_close) {
2906                         atomic_inc(&cm_closes);
2907                         nes_disconnect(nesqp, 1);
2908
2909                         cm_id->provider_data = nesqp;
2910                         /* Send up the close complete event */
2911                         cm_event.event = IW_CM_EVENT_CLOSE;
2912                         cm_event.status = 0;
2913                         cm_event.provider_data = cm_id->provider_data;
2914                         cm_event.local_addr = cm_id->local_addr;
2915                         cm_event.remote_addr = cm_id->remote_addr;
2916                         cm_event.private_data = NULL;
2917                         cm_event.private_data_len = 0;
2918
2919                         ret = cm_id->event_handler(cm_id, &cm_event);
2920                         if (ret)
2921                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2922
2923                         cm_id->rem_ref(cm_id);
2924                 }
2925         }
2926
2927         return 0;
2928 }
2929
2930
2931 /**
2932  * nes_disconnect
2933  */
2934 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2935 {
2936         int ret = 0;
2937         struct nes_vnic *nesvnic;
2938         struct nes_device *nesdev;
2939         struct nes_ib_device *nesibdev;
2940
2941         nesvnic = to_nesvnic(nesqp->ibqp.device);
2942         if (!nesvnic)
2943                 return -EINVAL;
2944
2945         nesdev = nesvnic->nesdev;
2946         nesibdev = nesvnic->nesibdev;
2947
2948         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2949                         netdev_refcnt_read(nesvnic->netdev));
2950
2951         if (nesqp->active_conn) {
2952
2953                 /* indicate this connection is NOT active */
2954                 nesqp->active_conn = 0;
2955         } else {
2956                 /* Need to free the Last Streaming Mode Message */
2957                 if (nesqp->ietf_frame) {
2958                         if (nesqp->lsmm_mr)
2959                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2960                         pci_free_consistent(nesdev->pcidev,
2961                                             nesqp->private_data_len + nesqp->ietf_frame_size,
2962                                             nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2963                 }
2964         }
2965
2966         /* close the CM node down if it is still active */
2967         if (nesqp->cm_node) {
2968                 nes_debug(NES_DBG_CM, "Call close API\n");
2969
2970                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2971         }
2972
2973         return ret;
2974 }
2975
2976
2977 /**
2978  * nes_accept
2979  */
2980 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2981 {
2982         u64 u64temp;
2983         struct ib_qp *ibqp;
2984         struct nes_qp *nesqp;
2985         struct nes_vnic *nesvnic;
2986         struct nes_device *nesdev;
2987         struct nes_cm_node *cm_node;
2988         struct nes_adapter *adapter;
2989         struct ib_qp_attr attr;
2990         struct iw_cm_event cm_event;
2991         struct nes_hw_qp_wqe *wqe;
2992         struct nes_v4_quad nes_quad;
2993         u32 crc_value;
2994         int ret;
2995         int passive_state;
2996         struct nes_ib_device *nesibdev;
2997         struct ib_mr *ibmr = NULL;
2998         struct ib_phys_buf ibphysbuf;
2999         struct nes_pd *nespd;
3000         u64 tagged_offset;
3001         u8 mpa_frame_offset = 0;
3002         struct ietf_mpa_v2 *mpa_v2_frame;
3003         u8 start_addr = 0;
3004         u8 *start_ptr = &start_addr;
3005         u8 **start_buff = &start_ptr;
3006         u16 buff_len = 0;
3007
3008         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3009         if (!ibqp)
3010                 return -EINVAL;
3011
3012         /* get all our handles */
3013         nesqp = to_nesqp(ibqp);
3014         nesvnic = to_nesvnic(nesqp->ibqp.device);
3015         nesdev = nesvnic->nesdev;
3016         adapter = nesdev->nesadapter;
3017
3018         cm_node = (struct nes_cm_node *)cm_id->provider_data;
3019         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3020                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3021                 nesvnic->netdev->name);
3022
3023         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3024                 if (cm_node->loopbackpartner)
3025                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3026                 rem_ref_cm_node(cm_node->cm_core, cm_node);
3027                 return -EINVAL;
3028         }
3029
3030         passive_state = atomic_add_return(1, &cm_node->passive_state);
3031         if (passive_state == NES_SEND_RESET_EVENT) {
3032                 rem_ref_cm_node(cm_node->cm_core, cm_node);
3033                 return -ECONNRESET;
3034         }
3035
3036         /* associate the node with the QP */
3037         nesqp->cm_node = (void *)cm_node;
3038         cm_node->nesqp = nesqp;
3039
3040         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3041                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3042         atomic_inc(&cm_accepts);
3043
3044         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3045                         netdev_refcnt_read(nesvnic->netdev));
3046
3047         nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3048         /* allocate the ietf frame and space for private data */
3049         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3050                                                  nesqp->ietf_frame_size + conn_param->private_data_len,
3051                                                  &nesqp->ietf_frame_pbase);
3052
3053         if (!nesqp->ietf_frame) {
3054                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3055                 return -ENOMEM;
3056         }
3057         mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3058
3059         if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3060                 mpa_frame_offset = 4;
3061
3062         memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3063                conn_param->private_data_len);
3064
3065         cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3066         nesqp->private_data_len = conn_param->private_data_len;
3067
3068         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3069         wqe = &nesqp->hwqp.sq_vbase[0];
3070
3071         if (cm_id->remote_addr.sin_addr.s_addr !=
3072             cm_id->local_addr.sin_addr.s_addr) {
3073                 u64temp = (unsigned long)nesqp;
3074                 nesibdev = nesvnic->nesibdev;
3075                 nespd = nesqp->nespd;
3076                 ibphysbuf.addr = nesqp->ietf_frame_pbase + mpa_frame_offset;
3077                 ibphysbuf.size = buff_len;
3078                 tagged_offset = (u64)(unsigned long)*start_buff;
3079                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
3080                                                    &ibphysbuf, 1,
3081                                                    IB_ACCESS_LOCAL_WRITE,
3082                                                    &tagged_offset);
3083                 if (!ibmr) {
3084                         nes_debug(NES_DBG_CM, "Unable to register memory region"
3085                                   "for lSMM for cm_node = %p \n",
3086                                   cm_node);
3087                         pci_free_consistent(nesdev->pcidev,
3088                                             nesqp->private_data_len + nesqp->ietf_frame_size,
3089                                             nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3090                         return -ENOMEM;
3091                 }
3092
3093                 ibmr->pd = &nespd->ibpd;
3094                 ibmr->device = nespd->ibpd.device;
3095                 nesqp->lsmm_mr = ibmr;
3096
3097                 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3098                 set_wqe_64bit_value(wqe->wqe_words,
3099                                     NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3100                                     u64temp);
3101                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3102                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3103                                     NES_IWARP_SQ_WQE_WRPDU);
3104                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3105                         cpu_to_le32(buff_len);
3106                 set_wqe_64bit_value(wqe->wqe_words,
3107                                     NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3108                                     (u64)(unsigned long)(*start_buff));
3109                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3110                         cpu_to_le32(buff_len);
3111                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3112                 if (nesqp->sq_kmapped) {
3113                         nesqp->sq_kmapped = 0;
3114                         kunmap(nesqp->page);
3115                 }
3116
3117                 nesqp->nesqp_context->ird_ord_sizes |=
3118                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3119                                     NES_QPCONTEXT_ORDIRD_WRPDU);
3120         } else {
3121                 nesqp->nesqp_context->ird_ord_sizes |=
3122                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3123         }
3124         nesqp->skip_lsmm = 1;
3125
3126
3127         /* Cache the cm_id in the qp */
3128         nesqp->cm_id = cm_id;
3129         cm_node->cm_id = cm_id;
3130
3131         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
3132         cm_id->provider_data = nesqp;
3133         nesqp->active_conn = 0;
3134
3135         if (cm_node->state == NES_CM_STATE_TSA)
3136                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3137                           cm_node);
3138
3139         nes_cm_init_tsa_conn(nesqp, cm_node);
3140
3141         nesqp->nesqp_context->tcpPorts[0] =
3142                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3143         nesqp->nesqp_context->tcpPorts[1] =
3144                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3145
3146         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3147                 nesqp->nesqp_context->ip0 =
3148                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3149         else
3150                 nesqp->nesqp_context->ip0 =
3151                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3152
3153         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3154                 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3155                 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3156
3157         nesqp->nesqp_context->arp_index_vlan |=
3158                 cpu_to_le32(nes_arp_table(nesdev,
3159                                           le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3160                                           NES_ARP_RESOLVE) << 16);
3161
3162         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3163                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3164
3165         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3166
3167         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3168                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3169         nesqp->nesqp_context->ird_ord_sizes |=
3170                 cpu_to_le32((u32)conn_param->ord);
3171
3172         memset(&nes_quad, 0, sizeof(nes_quad));
3173         nes_quad.DstIpAdrIndex =
3174                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3175         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3176                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3177         else
3178                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3179         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3180         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3181
3182         /* Produce hash key */
3183         crc_value = get_crc_value(&nes_quad);
3184         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3185         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3186                   nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3187
3188         nesqp->hte_index &= adapter->hte_index_mask;
3189         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3190
3191         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3192
3193         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3194                   "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3195                   "private data length=%u.\n", nesqp->hwqp.qp_id,
3196                   ntohl(cm_id->remote_addr.sin_addr.s_addr),
3197                   ntohs(cm_id->remote_addr.sin_port),
3198                   ntohl(cm_id->local_addr.sin_addr.s_addr),
3199                   ntohs(cm_id->local_addr.sin_port),
3200                   le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3201                   le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3202                   buff_len);
3203
3204         /* notify OF layer that accept event was successful */
3205         cm_id->add_ref(cm_id);
3206         nes_add_ref(&nesqp->ibqp);
3207
3208         cm_event.event = IW_CM_EVENT_ESTABLISHED;
3209         cm_event.status = 0;
3210         cm_event.provider_data = (void *)nesqp;
3211         cm_event.local_addr = cm_id->local_addr;
3212         cm_event.remote_addr = cm_id->remote_addr;
3213         cm_event.private_data = NULL;
3214         cm_event.private_data_len = 0;
3215         ret = cm_id->event_handler(cm_id, &cm_event);
3216         attr.qp_state = IB_QPS_RTS;
3217         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3218         if (cm_node->loopbackpartner) {
3219                 cm_node->loopbackpartner->mpa_frame_size =
3220                         nesqp->private_data_len;
3221                 /* copy entire MPA frame to our cm_node's frame */
3222                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3223                        conn_param->private_data, conn_param->private_data_len);
3224                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3225         }
3226         if (ret)
3227                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3228                        "ret=%d\n", __func__, __LINE__, ret);
3229
3230         return 0;
3231 }
3232
3233
3234 /**
3235  * nes_reject
3236  */
3237 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3238 {
3239         struct nes_cm_node *cm_node;
3240         struct nes_cm_node *loopback;
3241         struct nes_cm_core *cm_core;
3242         u8 *start_buff;
3243
3244         atomic_inc(&cm_rejects);
3245         cm_node = (struct nes_cm_node *)cm_id->provider_data;
3246         loopback = cm_node->loopbackpartner;
3247         cm_core = cm_node->cm_core;
3248         cm_node->cm_id = cm_id;
3249
3250         if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3251                 return -EINVAL;
3252
3253         if (loopback) {
3254                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3255                 loopback->mpa_frame.priv_data_len = pdata_len;
3256                 loopback->mpa_frame_size = pdata_len;
3257         } else {
3258                 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3259                 cm_node->mpa_frame_size = pdata_len;
3260                 memcpy(start_buff, pdata, pdata_len);
3261         }
3262         return cm_core->api->reject(cm_core, cm_node);
3263 }
3264
3265
3266 /**
3267  * nes_connect
3268  * setup and launch cm connect node
3269  */
3270 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3271 {
3272         struct ib_qp *ibqp;
3273         struct nes_qp *nesqp;
3274         struct nes_vnic *nesvnic;
3275         struct nes_device *nesdev;
3276         struct nes_cm_node *cm_node;
3277         struct nes_cm_info cm_info;
3278         int apbvt_set = 0;
3279
3280         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3281         if (!ibqp)
3282                 return -EINVAL;
3283         nesqp = to_nesqp(ibqp);
3284         if (!nesqp)
3285                 return -EINVAL;
3286         nesvnic = to_nesvnic(nesqp->ibqp.device);
3287         if (!nesvnic)
3288                 return -EINVAL;
3289         nesdev = nesvnic->nesdev;
3290         if (!nesdev)
3291                 return -EINVAL;
3292
3293         if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3294                 return -EINVAL;
3295
3296         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3297                   "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3298                   ntohl(nesvnic->local_ipaddr),
3299                   ntohl(cm_id->remote_addr.sin_addr.s_addr),
3300                   ntohs(cm_id->remote_addr.sin_port),
3301                   ntohl(cm_id->local_addr.sin_addr.s_addr),
3302                   ntohs(cm_id->local_addr.sin_port));
3303
3304         atomic_inc(&cm_connects);
3305         nesqp->active_conn = 1;
3306
3307         /* cache the cm_id in the qp */
3308         nesqp->cm_id = cm_id;
3309
3310         cm_id->provider_data = nesqp;
3311
3312         nesqp->private_data_len = conn_param->private_data_len;
3313         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3314         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3315         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3316                   conn_param->private_data_len);
3317
3318         if (cm_id->local_addr.sin_addr.s_addr !=
3319             cm_id->remote_addr.sin_addr.s_addr) {
3320                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3321                                  PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3322                 apbvt_set = 1;
3323         }
3324
3325         /* set up the connection params for the node */
3326         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3327         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3328         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3329         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3330         cm_info.cm_id = cm_id;
3331         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3332
3333         cm_id->add_ref(cm_id);
3334
3335         /* create a connect CM node connection */
3336         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3337                                           conn_param->private_data_len, (void *)conn_param->private_data,
3338                                           &cm_info);
3339         if (!cm_node) {
3340                 if (apbvt_set)
3341                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3342                                          PCI_FUNC(nesdev->pcidev->devfn),
3343                                          NES_MANAGE_APBVT_DEL);
3344
3345                 cm_id->rem_ref(cm_id);
3346                 return -ENOMEM;
3347         }
3348
3349         cm_node->apbvt_set = apbvt_set;
3350         nesqp->cm_node = cm_node;
3351         cm_node->nesqp = nesqp;
3352         nes_add_ref(&nesqp->ibqp);
3353
3354         return 0;
3355 }
3356
3357
3358 /**
3359  * nes_create_listen
3360  */
3361 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3362 {
3363         struct nes_vnic *nesvnic;
3364         struct nes_cm_listener *cm_node;
3365         struct nes_cm_info cm_info;
3366         int err;
3367
3368         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3369                         cm_id, ntohs(cm_id->local_addr.sin_port));
3370
3371         nesvnic = to_nesvnic(cm_id->device);
3372         if (!nesvnic)
3373                 return -EINVAL;
3374
3375         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3376                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3377
3378         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3379                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3380
3381         /* setup listen params in our api call struct */
3382         cm_info.loc_addr = nesvnic->local_ipaddr;
3383         cm_info.loc_port = cm_id->local_addr.sin_port;
3384         cm_info.backlog = backlog;
3385         cm_info.cm_id = cm_id;
3386
3387         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3388
3389
3390         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3391         if (!cm_node) {
3392                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3393                        __func__, __LINE__);
3394                 return -ENOMEM;
3395         }
3396
3397         cm_id->provider_data = cm_node;
3398
3399         if (!cm_node->reused_node) {
3400                 err = nes_manage_apbvt(nesvnic,
3401                                        ntohs(cm_id->local_addr.sin_port),
3402                                        PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3403                                        NES_MANAGE_APBVT_ADD);
3404                 if (err) {
3405                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3406                                err);
3407                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3408                         return err;
3409                 }
3410                 atomic_inc(&cm_listens_created);
3411         }
3412
3413         cm_id->add_ref(cm_id);
3414         cm_id->provider_data = (void *)cm_node;
3415
3416
3417         return 0;
3418 }
3419
3420
3421 /**
3422  * nes_destroy_listen
3423  */
3424 int nes_destroy_listen(struct iw_cm_id *cm_id)
3425 {
3426         if (cm_id->provider_data)
3427                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3428         else
3429                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3430
3431         cm_id->rem_ref(cm_id);
3432
3433         return 0;
3434 }
3435
3436
3437 /**
3438  * nes_cm_recv
3439  */
3440 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3441 {
3442         int rc = 0;
3443
3444         cm_packets_received++;
3445         if ((g_cm_core) && (g_cm_core->api))
3446                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3447         else
3448                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3449                           " cm is not setup properly.\n");
3450
3451         return rc;
3452 }
3453
3454
3455 /**
3456  * nes_cm_start
3457  * Start and init a cm core module
3458  */
3459 int nes_cm_start(void)
3460 {
3461         nes_debug(NES_DBG_CM, "\n");
3462         /* create the primary CM core, pass this handle to subsequent core inits */
3463         g_cm_core = nes_cm_alloc_core();
3464         if (g_cm_core)
3465                 return 0;
3466         else
3467                 return -ENOMEM;
3468 }
3469
3470
3471 /**
3472  * nes_cm_stop
3473  * stop and dealloc all cm core instances
3474  */
3475 int nes_cm_stop(void)
3476 {
3477         g_cm_core->api->destroy_cm_core(g_cm_core);
3478         return 0;
3479 }
3480
3481
3482 /**
3483  * cm_event_connected
3484  * handle a connected event, setup QPs and HW
3485  */
3486 static void cm_event_connected(struct nes_cm_event *event)
3487 {
3488         struct nes_qp *nesqp;
3489         struct nes_vnic *nesvnic;
3490         struct nes_device *nesdev;
3491         struct nes_cm_node *cm_node;
3492         struct nes_adapter *nesadapter;
3493         struct ib_qp_attr attr;
3494         struct iw_cm_id *cm_id;
3495         struct iw_cm_event cm_event;
3496         struct nes_v4_quad nes_quad;
3497         u32 crc_value;
3498         int ret;
3499
3500         /* get all our handles */
3501         cm_node = event->cm_node;
3502         cm_id = cm_node->cm_id;
3503         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3504         nesqp = (struct nes_qp *)cm_id->provider_data;
3505         nesvnic = to_nesvnic(nesqp->ibqp.device);
3506         nesdev = nesvnic->nesdev;
3507         nesadapter = nesdev->nesadapter;
3508
3509         if (nesqp->destroyed)
3510                 return;
3511         atomic_inc(&cm_connecteds);
3512         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3513                   " local port 0x%04X. jiffies = %lu.\n",
3514                   nesqp->hwqp.qp_id,
3515                   ntohl(cm_id->remote_addr.sin_addr.s_addr),
3516                   ntohs(cm_id->remote_addr.sin_port),
3517                   ntohs(cm_id->local_addr.sin_port),
3518                   jiffies);
3519
3520         nes_cm_init_tsa_conn(nesqp, cm_node);
3521
3522         /* set the QP tsa context */
3523         nesqp->nesqp_context->tcpPorts[0] =
3524                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3525         nesqp->nesqp_context->tcpPorts[1] =
3526                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3527         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3528                 nesqp->nesqp_context->ip0 =
3529                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3530         else
3531                 nesqp->nesqp_context->ip0 =
3532                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3533
3534         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3535                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3536                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3537         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3538                         nes_arp_table(nesdev,
3539                         le32_to_cpu(nesqp->nesqp_context->ip0),
3540                         NULL, NES_ARP_RESOLVE) << 16);
3541         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3542                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3543         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3544         nesqp->nesqp_context->ird_ord_sizes |=
3545                         cpu_to_le32((u32)1 <<
3546                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3547
3548         /* Adjust tail for not having a LSMM */
3549         /*nesqp->hwqp.sq_tail = 1;*/
3550
3551         build_rdma0_msg(cm_node, &nesqp);
3552
3553         nes_write32(nesdev->regs + NES_WQE_ALLOC,
3554                     (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3555
3556         memset(&nes_quad, 0, sizeof(nes_quad));
3557
3558         nes_quad.DstIpAdrIndex =
3559                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3560         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3561                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3562         else
3563                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3564         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3565         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3566
3567         /* Produce hash key */
3568         crc_value = get_crc_value(&nes_quad);
3569         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3570         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3571                   nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3572
3573         nesqp->hte_index &= nesadapter->hte_index_mask;
3574         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3575
3576         nesqp->ietf_frame = &cm_node->mpa_frame;
3577         nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3578         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3579
3580         /* notify OF layer we successfully created the requested connection */
3581         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3582         cm_event.status = 0;
3583         cm_event.provider_data = cm_id->provider_data;
3584         cm_event.local_addr.sin_family = AF_INET;
3585         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3586         cm_event.remote_addr = cm_id->remote_addr;
3587
3588         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3589         cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3590         cm_event.ird = cm_node->ird_size;
3591         cm_event.ord = cm_node->ord_size;
3592
3593         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3594         ret = cm_id->event_handler(cm_id, &cm_event);
3595         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3596
3597         if (ret)
3598                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3599                        "ret=%d\n", __func__, __LINE__, ret);
3600         attr.qp_state = IB_QPS_RTS;
3601         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3602
3603         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3604                   "%lu\n", nesqp->hwqp.qp_id, jiffies);
3605
3606         return;
3607 }
3608
3609
3610 /**
3611  * cm_event_connect_error
3612  */
3613 static void cm_event_connect_error(struct nes_cm_event *event)
3614 {
3615         struct nes_qp *nesqp;
3616         struct iw_cm_id *cm_id;
3617         struct iw_cm_event cm_event;
3618         /* struct nes_cm_info cm_info; */
3619         int ret;
3620
3621         if (!event->cm_node)
3622                 return;
3623
3624         cm_id = event->cm_node->cm_id;
3625         if (!cm_id)
3626                 return;
3627
3628         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3629         nesqp = cm_id->provider_data;
3630
3631         if (!nesqp)
3632                 return;
3633
3634         /* notify OF layer about this connection error event */
3635         /* cm_id->rem_ref(cm_id); */
3636         nesqp->cm_id = NULL;
3637         cm_id->provider_data = NULL;
3638         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3639         cm_event.status = -ECONNRESET;
3640         cm_event.provider_data = cm_id->provider_data;
3641         cm_event.local_addr = cm_id->local_addr;
3642         cm_event.remote_addr = cm_id->remote_addr;
3643         cm_event.private_data = NULL;
3644         cm_event.private_data_len = 0;
3645
3646         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3647                   "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3648                   cm_event.remote_addr.sin_addr.s_addr);
3649
3650         ret = cm_id->event_handler(cm_id, &cm_event);
3651         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3652         if (ret)
3653                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3654                        "ret=%d\n", __func__, __LINE__, ret);
3655         cm_id->rem_ref(cm_id);
3656
3657         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3658         return;
3659 }
3660
3661
3662 /**
3663  * cm_event_reset
3664  */
3665 static void cm_event_reset(struct nes_cm_event *event)
3666 {
3667         struct nes_qp *nesqp;
3668         struct iw_cm_id *cm_id;
3669         struct iw_cm_event cm_event;
3670         /* struct nes_cm_info cm_info; */
3671         int ret;
3672
3673         if (!event->cm_node)
3674                 return;
3675
3676         if (!event->cm_node->cm_id)
3677                 return;
3678
3679         cm_id = event->cm_node->cm_id;
3680
3681         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3682         nesqp = cm_id->provider_data;
3683         if (!nesqp)
3684                 return;
3685
3686         nesqp->cm_id = NULL;
3687         /* cm_id->provider_data = NULL; */
3688         cm_event.event = IW_CM_EVENT_DISCONNECT;
3689         cm_event.status = -ECONNRESET;
3690         cm_event.provider_data = cm_id->provider_data;
3691         cm_event.local_addr = cm_id->local_addr;
3692         cm_event.remote_addr = cm_id->remote_addr;
3693         cm_event.private_data = NULL;
3694         cm_event.private_data_len = 0;
3695
3696         cm_id->add_ref(cm_id);
3697         ret = cm_id->event_handler(cm_id, &cm_event);
3698         atomic_inc(&cm_closes);
3699         cm_event.event = IW_CM_EVENT_CLOSE;
3700         cm_event.status = 0;
3701         cm_event.provider_data = cm_id->provider_data;
3702         cm_event.local_addr = cm_id->local_addr;
3703         cm_event.remote_addr = cm_id->remote_addr;
3704         cm_event.private_data = NULL;
3705         cm_event.private_data_len = 0;
3706         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3707         ret = cm_id->event_handler(cm_id, &cm_event);
3708
3709         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3710
3711
3712         /* notify OF layer about this connection error event */
3713         cm_id->rem_ref(cm_id);
3714
3715         return;
3716 }
3717
3718
3719 /**
3720  * cm_event_mpa_req
3721  */
3722 static void cm_event_mpa_req(struct nes_cm_event *event)
3723 {
3724         struct iw_cm_id *cm_id;
3725         struct iw_cm_event cm_event;
3726         int ret;
3727         struct nes_cm_node *cm_node;
3728
3729         cm_node = event->cm_node;
3730         if (!cm_node)
3731                 return;
3732         cm_id = cm_node->cm_id;
3733
3734         atomic_inc(&cm_connect_reqs);
3735         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3736                   cm_node, cm_id, jiffies);
3737
3738         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3739         cm_event.status = 0;
3740         cm_event.provider_data = (void *)cm_node;
3741
3742         cm_event.local_addr.sin_family = AF_INET;
3743         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3744         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3745
3746         cm_event.remote_addr.sin_family = AF_INET;
3747         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3748         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3749         cm_event.private_data = cm_node->mpa_frame_buf;
3750         cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3751         cm_event.ird = cm_node->ird_size;
3752         cm_event.ord = cm_node->ord_size;
3753
3754         ret = cm_id->event_handler(cm_id, &cm_event);
3755         if (ret)
3756                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3757                        __func__, __LINE__, ret);
3758         return;
3759 }
3760
3761
3762 static void cm_event_mpa_reject(struct nes_cm_event *event)
3763 {
3764         struct iw_cm_id *cm_id;
3765         struct iw_cm_event cm_event;
3766         struct nes_cm_node *cm_node;
3767         int ret;
3768
3769         cm_node = event->cm_node;
3770         if (!cm_node)
3771                 return;
3772         cm_id = cm_node->cm_id;
3773
3774         atomic_inc(&cm_connect_reqs);
3775         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3776                   cm_node, cm_id, jiffies);
3777
3778         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3779         cm_event.status = -ECONNREFUSED;
3780         cm_event.provider_data = cm_id->provider_data;
3781
3782         cm_event.local_addr.sin_family = AF_INET;
3783         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3784         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3785
3786         cm_event.remote_addr.sin_family = AF_INET;
3787         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3788         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3789
3790         cm_event.private_data = cm_node->mpa_frame_buf;
3791         cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3792
3793         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3794                   "remove_addr=%08x\n",
3795                   cm_event.local_addr.sin_addr.s_addr,
3796                   cm_event.remote_addr.sin_addr.s_addr);
3797
3798         ret = cm_id->event_handler(cm_id, &cm_event);
3799         if (ret)
3800                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3801                        __func__, __LINE__, ret);
3802
3803         return;
3804 }
3805
3806
3807 static void nes_cm_event_handler(struct work_struct *);
3808
3809 /**
3810  * nes_cm_post_event
3811  * post an event to the cm event handler
3812  */
3813 static int nes_cm_post_event(struct nes_cm_event *event)
3814 {
3815         atomic_inc(&event->cm_node->cm_core->events_posted);
3816         add_ref_cm_node(event->cm_node);
3817         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3818         INIT_WORK(&event->event_work, nes_cm_event_handler);
3819         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3820                   event->cm_node, event);
3821
3822         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3823
3824         nes_debug(NES_DBG_CM, "Exit\n");
3825         return 0;
3826 }
3827
3828
3829 /**
3830  * nes_cm_event_handler
3831  * worker function to handle cm events
3832  * will free instance of nes_cm_event
3833  */
3834 static void nes_cm_event_handler(struct work_struct *work)
3835 {
3836         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3837                                                   event_work);
3838         struct nes_cm_core *cm_core;
3839
3840         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3841                 return;
3842
3843         cm_core = event->cm_node->cm_core;
3844         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3845                   event, event->type, atomic_read(&cm_core->events_posted));
3846
3847         switch (event->type) {
3848         case NES_CM_EVENT_MPA_REQ:
3849                 cm_event_mpa_req(event);
3850                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3851                           event->cm_node);
3852                 break;
3853         case NES_CM_EVENT_RESET:
3854                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3855                           event->cm_node);
3856                 cm_event_reset(event);
3857                 break;
3858         case NES_CM_EVENT_CONNECTED:
3859                 if ((!event->cm_node->cm_id) ||
3860                     (event->cm_node->state != NES_CM_STATE_TSA))
3861                         break;
3862                 cm_event_connected(event);
3863                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3864                 break;
3865         case NES_CM_EVENT_MPA_REJECT:
3866                 if ((!event->cm_node->cm_id) ||
3867                     (event->cm_node->state == NES_CM_STATE_TSA))
3868                         break;
3869                 cm_event_mpa_reject(event);
3870                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3871                 break;
3872
3873         case NES_CM_EVENT_ABORTED:
3874                 if ((!event->cm_node->cm_id) ||
3875                     (event->cm_node->state == NES_CM_STATE_TSA))
3876                         break;
3877                 cm_event_connect_error(event);
3878                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3879                 break;
3880         case NES_CM_EVENT_DROPPED_PKT:
3881                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3882                 break;
3883         default:
3884                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3885                 break;
3886         }
3887
3888         atomic_dec(&cm_core->events_posted);
3889         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3890         rem_ref_cm_node(cm_core, event->cm_node);
3891         kfree(event);
3892
3893         return;
3894 }