RDMA/nes: Fix crash in nes_accept()
[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 <asm/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 <net/arp.h>
56 #include <net/neighbour.h>
57 #include <net/route.h>
58 #include <net/ip_fib.h>
59 #include <net/tcp.h>
60
61 #include "nes.h"
62
63 u32 cm_packets_sent;
64 u32 cm_packets_bounced;
65 u32 cm_packets_dropped;
66 u32 cm_packets_retrans;
67 u32 cm_packets_created;
68 u32 cm_packets_received;
69 u32 cm_listens_created;
70 u32 cm_listens_destroyed;
71 u32 cm_backlog_drops;
72 atomic_t cm_loopbacks;
73 atomic_t cm_nodes_created;
74 atomic_t cm_nodes_destroyed;
75 atomic_t cm_accel_dropped_pkts;
76 atomic_t cm_resets_recvd;
77
78 static inline int mini_cm_accelerated(struct nes_cm_core *,
79         struct nes_cm_node *);
80 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
81         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 *,
84         struct nes_vnic *, u16, void *, struct nes_cm_info *);
85 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
86 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
87         struct nes_cm_node *);
88 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
89         struct nes_cm_node *);
90 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
91         struct sk_buff *);
92 static int mini_cm_dealloc_core(struct nes_cm_core *);
93 static int mini_cm_get(struct nes_cm_core *);
94 static int mini_cm_set(struct nes_cm_core *, u32, u32);
95
96 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
97         void *, u32, void *, u32, u8);
98 static int add_ref_cm_node(struct nes_cm_node *);
99 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
100
101 static int nes_cm_disconn_true(struct nes_qp *);
102 static int nes_cm_post_event(struct nes_cm_event *event);
103 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
104 static void nes_disconnect_worker(struct work_struct *work);
105
106 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
107 static int send_mpa_reject(struct nes_cm_node *);
108 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
109 static int send_reset(struct nes_cm_node *, struct sk_buff *);
110 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
111 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
112 static void process_packet(struct nes_cm_node *, struct sk_buff *,
113         struct nes_cm_core *);
114
115 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
116 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
117 static void cleanup_retrans_entry(struct nes_cm_node *);
118 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
119 static void free_retrans_entry(struct nes_cm_node *cm_node);
120 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
121         struct sk_buff *skb, int optionsize, int passive);
122
123 /* CM event handler functions */
124 static void cm_event_connected(struct nes_cm_event *);
125 static void cm_event_connect_error(struct nes_cm_event *);
126 static void cm_event_reset(struct nes_cm_event *);
127 static void cm_event_mpa_req(struct nes_cm_event *);
128 static void cm_event_mpa_reject(struct nes_cm_event *);
129 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
130
131 static void print_core(struct nes_cm_core *core);
132
133 /* External CM API Interface */
134 /* instance of function pointers for client API */
135 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
136 static struct nes_cm_ops nes_cm_api = {
137         mini_cm_accelerated,
138         mini_cm_listen,
139         mini_cm_del_listen,
140         mini_cm_connect,
141         mini_cm_close,
142         mini_cm_accept,
143         mini_cm_reject,
144         mini_cm_recv_pkt,
145         mini_cm_dealloc_core,
146         mini_cm_get,
147         mini_cm_set
148 };
149
150 static struct nes_cm_core *g_cm_core;
151
152 atomic_t cm_connects;
153 atomic_t cm_accepts;
154 atomic_t cm_disconnects;
155 atomic_t cm_closes;
156 atomic_t cm_connecteds;
157 atomic_t cm_connect_reqs;
158 atomic_t cm_rejects;
159
160
161 /**
162  * create_event
163  */
164 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
165                 enum nes_cm_event_type type)
166 {
167         struct nes_cm_event *event;
168
169         if (!cm_node->cm_id)
170                 return NULL;
171
172         /* allocate an empty event */
173         event = kzalloc(sizeof(*event), GFP_ATOMIC);
174
175         if (!event)
176                 return NULL;
177
178         event->type = type;
179         event->cm_node = cm_node;
180         event->cm_info.rem_addr = cm_node->rem_addr;
181         event->cm_info.loc_addr = cm_node->loc_addr;
182         event->cm_info.rem_port = cm_node->rem_port;
183         event->cm_info.loc_port = cm_node->loc_port;
184         event->cm_info.cm_id = cm_node->cm_id;
185
186         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
187                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
188                 cm_node, event, type, event->cm_info.loc_addr,
189                 event->cm_info.loc_port, event->cm_info.rem_addr,
190                 event->cm_info.rem_port);
191
192         nes_cm_post_event(event);
193         return event;
194 }
195
196
197 /**
198  * send_mpa_request
199  */
200 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
201 {
202         if (!skb) {
203                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
204                 return -1;
205         }
206
207         /* send an MPA Request frame */
208         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
209                         cm_node->mpa_frame_size, SET_ACK);
210
211         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
212 }
213
214
215
216 static int send_mpa_reject(struct nes_cm_node *cm_node)
217 {
218         struct sk_buff  *skb = NULL;
219
220         skb = dev_alloc_skb(MAX_CM_BUFFER);
221         if (!skb) {
222                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
223                 return -ENOMEM;
224         }
225
226         /* send an MPA reject frame */
227         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
228                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
229
230         cm_node->state = NES_CM_STATE_FIN_WAIT1;
231         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
232 }
233
234
235 /**
236  * recv_mpa - process a received TCP pkt, we are expecting an
237  * IETF MPA frame
238  */
239 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
240                 u32 len)
241 {
242         struct ietf_mpa_frame *mpa_frame;
243
244         *type = NES_MPA_REQUEST_ACCEPT;
245
246         /* assume req frame is in tcp data payload */
247         if (len < sizeof(struct ietf_mpa_frame)) {
248                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
249                 return -EINVAL;
250         }
251
252         mpa_frame = (struct ietf_mpa_frame *)buffer;
253         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
254         /* make sure mpa private data len is less than 512 bytes */
255         if (cm_node->mpa_frame_size > IETF_MAX_PRIV_DATA_LEN) {
256                 nes_debug(NES_DBG_CM, "The received Length of Private"
257                         " Data field exceeds 512 octets\n");
258                 return -EINVAL;
259         }
260         /*
261          * make sure MPA receiver interoperate with the
262          * received MPA version and MPA key information
263          *
264          */
265         if (mpa_frame->rev != mpa_version) {
266                 nes_debug(NES_DBG_CM, "The received mpa version"
267                                 " can not be interoperated\n");
268                 return -EINVAL;
269         }
270         if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
271                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
272                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
273                         return -EINVAL;
274                 }
275         } else {
276                 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
277                         nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
278                         return -EINVAL;
279                 }
280         }
281
282         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
283                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
284                                 " complete (%x + %x != %x)\n",
285                                 cm_node->mpa_frame_size,
286                                 (u32)sizeof(struct ietf_mpa_frame), len);
287                 return -EINVAL;
288         }
289         /* make sure it does not exceed the max size */
290         if (len > MAX_CM_BUFFER) {
291                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
292                                 " (%x + %x != %x)\n",
293                                 cm_node->mpa_frame_size,
294                                 (u32)sizeof(struct ietf_mpa_frame), len);
295                 return -EINVAL;
296         }
297
298         /* copy entire MPA frame to our cm_node's frame */
299         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
300                         cm_node->mpa_frame_size);
301
302         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
303                 *type = NES_MPA_REQUEST_REJECT;
304         return 0;
305 }
306
307
308 /**
309  * form_cm_frame - get a free packet and build empty frame Use
310  * node info to build.
311  */
312 static void form_cm_frame(struct sk_buff *skb,
313         struct nes_cm_node *cm_node, void *options, u32 optionsize,
314         void *data, u32 datasize, u8 flags)
315 {
316         struct tcphdr *tcph;
317         struct iphdr *iph;
318         struct ethhdr *ethh;
319         u8 *buf;
320         u16 packetsize = sizeof(*iph);
321
322         packetsize += sizeof(*tcph);
323         packetsize +=  optionsize + datasize;
324
325         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
326
327         skb->len = 0;
328         buf = skb_put(skb, packetsize + ETH_HLEN);
329
330         ethh = (struct ethhdr *) buf;
331         buf += ETH_HLEN;
332
333         iph = (struct iphdr *)buf;
334         buf += sizeof(*iph);
335         tcph = (struct tcphdr *)buf;
336         skb_reset_mac_header(skb);
337         skb_set_network_header(skb, ETH_HLEN);
338         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
339         buf += sizeof(*tcph);
340
341         skb->ip_summed = CHECKSUM_PARTIAL;
342         skb->protocol = htons(0x800);
343         skb->data_len = 0;
344         skb->mac_len = ETH_HLEN;
345
346         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
347         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
348         ethh->h_proto = htons(0x0800);
349
350         iph->version = IPVERSION;
351         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
352         iph->tos = 0;
353         iph->tot_len = htons(packetsize);
354         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
355
356         iph->frag_off = htons(0x4000);
357         iph->ttl = 0x40;
358         iph->protocol = 0x06;   /* IPPROTO_TCP */
359
360         iph->saddr = htonl(cm_node->loc_addr);
361         iph->daddr = htonl(cm_node->rem_addr);
362
363         tcph->source = htons(cm_node->loc_port);
364         tcph->dest = htons(cm_node->rem_port);
365         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
366
367         if (flags & SET_ACK) {
368                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
369                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
370                 tcph->ack = 1;
371         } else
372                 tcph->ack_seq = 0;
373
374         if (flags & SET_SYN) {
375                 cm_node->tcp_cntxt.loc_seq_num++;
376                 tcph->syn = 1;
377         } else
378                 cm_node->tcp_cntxt.loc_seq_num += datasize;
379
380         if (flags & SET_FIN) {
381                 cm_node->tcp_cntxt.loc_seq_num++;
382                 tcph->fin = 1;
383         }
384
385         if (flags & SET_RST)
386                 tcph->rst = 1;
387
388         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
389         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
390         tcph->urg_ptr = 0;
391         if (optionsize)
392                 memcpy(buf, options, optionsize);
393         buf += optionsize;
394         if (datasize)
395                 memcpy(buf, data, datasize);
396
397         skb_shinfo(skb)->nr_frags = 0;
398         cm_packets_created++;
399
400 }
401
402
403 /**
404  * print_core - dump a cm core
405  */
406 static void print_core(struct nes_cm_core *core)
407 {
408         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
409         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
410         if (!core)
411                 return;
412         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
413
414         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
415
416         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
417         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
418
419         nes_debug(NES_DBG_CM, "core          : %p \n", core);
420
421         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
422 }
423
424
425 /**
426  * schedule_nes_timer
427  * note - cm_node needs to be protected before calling this. Encase in:
428  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
429  */
430 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
431                 enum nes_timer_type type, int send_retrans,
432                 int close_when_complete)
433 {
434         unsigned long  flags;
435         struct nes_cm_core *cm_core = cm_node->cm_core;
436         struct nes_timer_entry *new_send;
437         int ret = 0;
438         u32 was_timer_set;
439
440         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
441         if (!new_send)
442                 return -ENOMEM;
443
444         /* new_send->timetosend = currenttime */
445         new_send->retrycount = NES_DEFAULT_RETRYS;
446         new_send->retranscount = NES_DEFAULT_RETRANS;
447         new_send->skb = skb;
448         new_send->timetosend = jiffies;
449         new_send->type = type;
450         new_send->netdev = cm_node->netdev;
451         new_send->send_retrans = send_retrans;
452         new_send->close_when_complete = close_when_complete;
453
454         if (type == NES_TIMER_TYPE_CLOSE) {
455                 new_send->timetosend += (HZ/10);
456                 if (cm_node->recv_entry) {
457                         kfree(new_send);
458                         WARN_ON(1);
459                         return -EINVAL;
460                 }
461                 cm_node->recv_entry = new_send;
462         }
463
464         if (type == NES_TIMER_TYPE_SEND) {
465                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
466                 atomic_inc(&new_send->skb->users);
467                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
468                 cm_node->send_entry = new_send;
469                 add_ref_cm_node(cm_node);
470                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
471                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
472
473                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
474                 if (ret != NETDEV_TX_OK) {
475                         nes_debug(NES_DBG_CM, "Error sending packet %p "
476                                 "(jiffies = %lu)\n", new_send, jiffies);
477                         new_send->timetosend = jiffies;
478                         ret = NETDEV_TX_OK;
479                 } else {
480                         cm_packets_sent++;
481                         if (!send_retrans) {
482                                 cleanup_retrans_entry(cm_node);
483                                 if (close_when_complete)
484                                         rem_ref_cm_node(cm_core, cm_node);
485                                 return ret;
486                         }
487                 }
488         }
489
490         was_timer_set = timer_pending(&cm_core->tcp_timer);
491
492         if (!was_timer_set) {
493                 cm_core->tcp_timer.expires = new_send->timetosend;
494                 add_timer(&cm_core->tcp_timer);
495         }
496
497         return ret;
498 }
499
500 static void nes_retrans_expired(struct nes_cm_node *cm_node)
501 {
502         struct iw_cm_id *cm_id = cm_node->cm_id;
503         switch (cm_node->state) {
504         case NES_CM_STATE_SYN_RCVD:
505         case NES_CM_STATE_CLOSING:
506                 rem_ref_cm_node(cm_node->cm_core, cm_node);
507                 break;
508         case NES_CM_STATE_LAST_ACK:
509         case NES_CM_STATE_FIN_WAIT1:
510                 if (cm_node->cm_id)
511                         cm_id->rem_ref(cm_id);
512                 cm_node->state = NES_CM_STATE_CLOSED;
513                 send_reset(cm_node, NULL);
514                 break;
515         default:
516                 add_ref_cm_node(cm_node);
517                 send_reset(cm_node, NULL);
518                 create_event(cm_node, NES_CM_EVENT_ABORTED);
519         }
520 }
521
522 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
523 {
524         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
525         struct iw_cm_id *cm_id = cm_node->cm_id;
526         struct nes_qp *nesqp;
527         unsigned long qplockflags;
528
529         if (!recv_entry)
530                 return;
531         nesqp = (struct nes_qp *)recv_entry->skb;
532         if (nesqp) {
533                 spin_lock_irqsave(&nesqp->lock, qplockflags);
534                 if (nesqp->cm_id) {
535                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
536                                 "refcount = %d: HIT A "
537                                 "NES_TIMER_TYPE_CLOSE with something "
538                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
539                                 atomic_read(&nesqp->refcount));
540                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
541                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
542                         nesqp->ibqp_state = IB_QPS_ERR;
543                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
544                         nes_cm_disconn(nesqp);
545                 } else {
546                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
547                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
548                                 "refcount = %d: HIT A "
549                                 "NES_TIMER_TYPE_CLOSE with nothing "
550                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
551                                 atomic_read(&nesqp->refcount));
552                 }
553         } else if (rem_node) {
554                 /* TIME_WAIT state */
555                 rem_ref_cm_node(cm_node->cm_core, cm_node);
556         }
557         if (cm_node->cm_id)
558                 cm_id->rem_ref(cm_id);
559         kfree(recv_entry);
560         cm_node->recv_entry = NULL;
561 }
562
563 /**
564  * nes_cm_timer_tick
565  */
566 static void nes_cm_timer_tick(unsigned long pass)
567 {
568         unsigned long flags;
569         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
570         struct nes_cm_node *cm_node;
571         struct nes_timer_entry *send_entry, *recv_entry;
572         struct list_head *list_core_temp;
573         struct list_head *list_node;
574         struct nes_cm_core *cm_core = g_cm_core;
575         u32 settimer = 0;
576         unsigned long timetosend;
577         int ret = NETDEV_TX_OK;
578
579         struct list_head timer_list;
580         INIT_LIST_HEAD(&timer_list);
581         spin_lock_irqsave(&cm_core->ht_lock, flags);
582
583         list_for_each_safe(list_node, list_core_temp,
584                                 &cm_core->connected_nodes) {
585                 cm_node = container_of(list_node, struct nes_cm_node, list);
586                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
587                         add_ref_cm_node(cm_node);
588                         list_add(&cm_node->timer_entry, &timer_list);
589                 }
590         }
591         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
592
593         list_for_each_safe(list_node, list_core_temp, &timer_list) {
594                 cm_node = container_of(list_node, struct nes_cm_node,
595                                         timer_entry);
596                 recv_entry = cm_node->recv_entry;
597
598                 if (recv_entry) {
599                         if (time_after(recv_entry->timetosend, jiffies)) {
600                                 if (nexttimeout > recv_entry->timetosend ||
601                                                 !settimer) {
602                                         nexttimeout = recv_entry->timetosend;
603                                         settimer = 1;
604                                 }
605                         } else
606                                 handle_recv_entry(cm_node, 1);
607                 }
608
609                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
610                 do {
611                         send_entry = cm_node->send_entry;
612                         if (!send_entry)
613                                 break;
614                         if (time_after(send_entry->timetosend, jiffies)) {
615                                 if (cm_node->state != NES_CM_STATE_TSA) {
616                                         if ((nexttimeout >
617                                                 send_entry->timetosend) ||
618                                                 !settimer) {
619                                                 nexttimeout =
620                                                         send_entry->timetosend;
621                                                 settimer = 1;
622                                         }
623                                 } else {
624                                         free_retrans_entry(cm_node);
625                                 }
626                                 break;
627                         }
628
629                         if ((cm_node->state == NES_CM_STATE_TSA) ||
630                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
631                                 free_retrans_entry(cm_node);
632                                 break;
633                         }
634
635                         if (!send_entry->retranscount ||
636                                 !send_entry->retrycount) {
637                                 cm_packets_dropped++;
638                                 free_retrans_entry(cm_node);
639
640                                 spin_unlock_irqrestore(
641                                         &cm_node->retrans_list_lock, flags);
642                                 nes_retrans_expired(cm_node);
643                                 cm_node->state = NES_CM_STATE_CLOSED;
644                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
645                                         flags);
646                                 break;
647                         }
648                         atomic_inc(&send_entry->skb->users);
649                         cm_packets_retrans++;
650                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
651                                 "for node %p, jiffies = %lu, time to send = "
652                                 "%lu, retranscount = %u, send_entry->seq_num = "
653                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
654                                 "0x%08X\n", send_entry, cm_node, jiffies,
655                                 send_entry->timetosend,
656                                 send_entry->retranscount,
657                                 send_entry->seq_num,
658                                 cm_node->tcp_cntxt.rem_ack_num);
659
660                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
661                                 flags);
662                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
663                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
664                         if (ret != NETDEV_TX_OK) {
665                                 nes_debug(NES_DBG_CM, "rexmit failed for "
666                                         "node=%p\n", cm_node);
667                                 cm_packets_bounced++;
668                                 send_entry->retrycount--;
669                                 nexttimeout = jiffies + NES_SHORT_TIME;
670                                 settimer = 1;
671                                 break;
672                         } else {
673                                 cm_packets_sent++;
674                         }
675                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
676                                 "%u, retry count = %u.\n",
677                                 send_entry->retranscount,
678                                 send_entry->retrycount);
679                         if (send_entry->send_retrans) {
680                                 send_entry->retranscount--;
681                                 timetosend = (NES_RETRY_TIMEOUT <<
682                                         (NES_DEFAULT_RETRANS - send_entry->retranscount));
683
684                                 send_entry->timetosend = jiffies +
685                                         min(timetosend, NES_MAX_TIMEOUT);
686                                 if (nexttimeout > send_entry->timetosend ||
687                                         !settimer) {
688                                         nexttimeout = send_entry->timetosend;
689                                         settimer = 1;
690                                 }
691                         } else {
692                                 int close_when_complete;
693                                 close_when_complete =
694                                         send_entry->close_when_complete;
695                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
696                                         cm_node, cm_node->state);
697                                 free_retrans_entry(cm_node);
698                                 if (close_when_complete)
699                                         rem_ref_cm_node(cm_node->cm_core,
700                                                 cm_node);
701                         }
702                 } while (0);
703
704                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
705                 rem_ref_cm_node(cm_node->cm_core, cm_node);
706         }
707
708         if (settimer) {
709                 if (!timer_pending(&cm_core->tcp_timer)) {
710                         cm_core->tcp_timer.expires  = nexttimeout;
711                         add_timer(&cm_core->tcp_timer);
712                 }
713         }
714 }
715
716
717 /**
718  * send_syn
719  */
720 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
721         struct sk_buff *skb)
722 {
723         int ret;
724         int flags = SET_SYN;
725         char optionsbuffer[sizeof(struct option_mss) +
726                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
727                 TCP_OPTIONS_PADDING];
728
729         int optionssize = 0;
730         /* Sending MSS option */
731         union all_known_options *options;
732
733         if (!cm_node)
734                 return -EINVAL;
735
736         options = (union all_known_options *)&optionsbuffer[optionssize];
737         options->as_mss.optionnum = OPTION_NUMBER_MSS;
738         options->as_mss.length = sizeof(struct option_mss);
739         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
740         optionssize += sizeof(struct option_mss);
741
742         options = (union all_known_options *)&optionsbuffer[optionssize];
743         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
744         options->as_windowscale.length = sizeof(struct option_windowscale);
745         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
746         optionssize += sizeof(struct option_windowscale);
747
748         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
749                 options = (union all_known_options *)&optionsbuffer[optionssize];
750                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
751                 options->as_base.length = sizeof(struct option_base);
752                 optionssize += sizeof(struct option_base);
753                 /* we need the size to be a multiple of 4 */
754                 options = (union all_known_options *)&optionsbuffer[optionssize];
755                 options->as_end = 1;
756                 optionssize += 1;
757                 options = (union all_known_options *)&optionsbuffer[optionssize];
758                 options->as_end = 1;
759                 optionssize += 1;
760         }
761
762         options = (union all_known_options *)&optionsbuffer[optionssize];
763         options->as_end = OPTION_NUMBER_END;
764         optionssize += 1;
765
766         if (!skb)
767                 skb = dev_alloc_skb(MAX_CM_BUFFER);
768         if (!skb) {
769                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
770                 return -1;
771         }
772
773         if (sendack)
774                 flags |= SET_ACK;
775
776         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
777         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
778
779         return ret;
780 }
781
782
783 /**
784  * send_reset
785  */
786 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
787 {
788         int ret;
789         int flags = SET_RST | SET_ACK;
790
791         if (!skb)
792                 skb = dev_alloc_skb(MAX_CM_BUFFER);
793         if (!skb) {
794                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
795                 return -ENOMEM;
796         }
797
798         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
799         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
800
801         return ret;
802 }
803
804
805 /**
806  * send_ack
807  */
808 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
809 {
810         int ret;
811
812         if (!skb)
813                 skb = dev_alloc_skb(MAX_CM_BUFFER);
814
815         if (!skb) {
816                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
817                 return -1;
818         }
819
820         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
821         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
822
823         return ret;
824 }
825
826
827 /**
828  * send_fin
829  */
830 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
831 {
832         int ret;
833
834         /* if we didn't get a frame get one */
835         if (!skb)
836                 skb = dev_alloc_skb(MAX_CM_BUFFER);
837
838         if (!skb) {
839                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
840                 return -1;
841         }
842
843         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
844         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
845
846         return ret;
847 }
848
849
850 /**
851  * find_node - find a cm node that matches the reference cm node
852  */
853 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
854                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
855 {
856         unsigned long flags;
857         struct list_head *hte;
858         struct nes_cm_node *cm_node;
859
860         /* get a handle on the hte */
861         hte = &cm_core->connected_nodes;
862
863         /* walk list and find cm_node associated with this session ID */
864         spin_lock_irqsave(&cm_core->ht_lock, flags);
865         list_for_each_entry(cm_node, hte, list) {
866                 /* compare quad, return node handle if a match */
867                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
868                                 cm_node->loc_addr, cm_node->loc_port,
869                                 loc_addr, loc_port,
870                                 cm_node->rem_addr, cm_node->rem_port,
871                                 rem_addr, rem_port);
872                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
873                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
874                         add_ref_cm_node(cm_node);
875                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
876                         return cm_node;
877                 }
878         }
879         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
880
881         /* no owner node */
882         return NULL;
883 }
884
885
886 /**
887  * find_listener - find a cm node listening on this addr-port pair
888  */
889 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
890                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
891 {
892         unsigned long flags;
893         struct nes_cm_listener *listen_node;
894
895         /* walk list and find cm_node associated with this session ID */
896         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
897         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
898                 /* compare node pair, return node handle if a match */
899                 if (((listen_node->loc_addr == dst_addr) ||
900                                 listen_node->loc_addr == 0x00000000) &&
901                                 (listen_node->loc_port == dst_port) &&
902                                 (listener_state & listen_node->listener_state)) {
903                         atomic_inc(&listen_node->ref_count);
904                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
905                         return listen_node;
906                 }
907         }
908         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
909
910         /* no listener */
911         return NULL;
912 }
913
914
915 /**
916  * add_hte_node - add a cm node to the hash table
917  */
918 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
919 {
920         unsigned long flags;
921         struct list_head *hte;
922
923         if (!cm_node || !cm_core)
924                 return -EINVAL;
925
926         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
927                 cm_node);
928
929         spin_lock_irqsave(&cm_core->ht_lock, flags);
930
931         /* get a handle on the hash table element (list head for this slot) */
932         hte = &cm_core->connected_nodes;
933         list_add_tail(&cm_node->list, hte);
934         atomic_inc(&cm_core->ht_node_cnt);
935
936         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
937
938         return 0;
939 }
940
941
942 /**
943  * mini_cm_dec_refcnt_listen
944  */
945 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
946         struct nes_cm_listener *listener, int free_hanging_nodes)
947 {
948         int ret = -EINVAL;
949         int err = 0;
950         unsigned long flags;
951         struct list_head *list_pos = NULL;
952         struct list_head *list_temp = NULL;
953         struct nes_cm_node *cm_node = NULL;
954         struct list_head reset_list;
955
956         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
957                 "refcnt=%d\n", listener, free_hanging_nodes,
958                 atomic_read(&listener->ref_count));
959         /* free non-accelerated child nodes for this listener */
960         INIT_LIST_HEAD(&reset_list);
961         if (free_hanging_nodes) {
962                 spin_lock_irqsave(&cm_core->ht_lock, flags);
963                 list_for_each_safe(list_pos, list_temp,
964                                    &g_cm_core->connected_nodes) {
965                         cm_node = container_of(list_pos, struct nes_cm_node,
966                                 list);
967                         if ((cm_node->listener == listener) &&
968                             (!cm_node->accelerated)) {
969                                 add_ref_cm_node(cm_node);
970                                 list_add(&cm_node->reset_entry, &reset_list);
971                         }
972                 }
973                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
974         }
975
976         list_for_each_safe(list_pos, list_temp, &reset_list) {
977                 cm_node = container_of(list_pos, struct nes_cm_node,
978                                 reset_entry);
979                 {
980                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
981                         enum nes_cm_node_state old_state;
982                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
983                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
984                         } else {
985                                 if (!loopback) {
986                                         cleanup_retrans_entry(cm_node);
987                                         err = send_reset(cm_node, NULL);
988                                         if (err) {
989                                                 cm_node->state =
990                                                          NES_CM_STATE_CLOSED;
991                                                 WARN_ON(1);
992                                         } else {
993                                                 old_state = cm_node->state;
994                                                 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
995                                                 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
996                                                         rem_ref_cm_node(
997                                                                 cm_node->cm_core,
998                                                                 cm_node);
999                                         }
1000                                 } else {
1001                                         struct nes_cm_event event;
1002
1003                                         event.cm_node = loopback;
1004                                         event.cm_info.rem_addr =
1005                                                         loopback->rem_addr;
1006                                         event.cm_info.loc_addr =
1007                                                         loopback->loc_addr;
1008                                         event.cm_info.rem_port =
1009                                                         loopback->rem_port;
1010                                         event.cm_info.loc_port =
1011                                                          loopback->loc_port;
1012                                         event.cm_info.cm_id = loopback->cm_id;
1013                                         cm_event_connect_error(&event);
1014                                         cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1015                                         loopback->state = NES_CM_STATE_CLOSED;
1016
1017                                         event.cm_node = cm_node;
1018                                         event.cm_info.rem_addr =
1019                                                          cm_node->rem_addr;
1020                                         event.cm_info.loc_addr =
1021                                                          cm_node->loc_addr;
1022                                         event.cm_info.rem_port =
1023                                                          cm_node->rem_port;
1024                                         event.cm_info.loc_port =
1025                                                          cm_node->loc_port;
1026                                         event.cm_info.cm_id = cm_node->cm_id;
1027                                         cm_event_reset(&event);
1028
1029                                         rem_ref_cm_node(cm_node->cm_core,
1030                                                          cm_node);
1031
1032                                 }
1033                         }
1034                 }
1035         }
1036
1037         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1038         if (!atomic_dec_return(&listener->ref_count)) {
1039                 list_del(&listener->list);
1040
1041                 /* decrement our listen node count */
1042                 atomic_dec(&cm_core->listen_node_cnt);
1043
1044                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1045
1046                 if (listener->nesvnic) {
1047                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1048                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1049                 }
1050
1051                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1052
1053                 kfree(listener);
1054                 listener = NULL;
1055                 ret = 0;
1056                 cm_listens_destroyed++;
1057         } else {
1058                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1059         }
1060         if (listener) {
1061                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1062                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1063                                         " with non-zero pending accepts=%u\n",
1064                                         listener, atomic_read(&listener->pend_accepts_cnt));
1065         }
1066
1067         return ret;
1068 }
1069
1070
1071 /**
1072  * mini_cm_del_listen
1073  */
1074 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1075                 struct nes_cm_listener *listener)
1076 {
1077         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1078         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1079         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1080 }
1081
1082
1083 /**
1084  * mini_cm_accelerated
1085  */
1086 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1087                 struct nes_cm_node *cm_node)
1088 {
1089         u32 was_timer_set;
1090         cm_node->accelerated = 1;
1091
1092         if (cm_node->accept_pend) {
1093                 BUG_ON(!cm_node->listener);
1094                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1095                 cm_node->accept_pend = 0;
1096                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1097         }
1098
1099         was_timer_set = timer_pending(&cm_core->tcp_timer);
1100         if (!was_timer_set) {
1101                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1102                 add_timer(&cm_core->tcp_timer);
1103         }
1104
1105         return 0;
1106 }
1107
1108
1109 /**
1110  * nes_addr_resolve_neigh
1111  */
1112 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1113 {
1114         struct rtable *rt;
1115         struct flowi fl;
1116         struct neighbour *neigh;
1117         int rc = -1;
1118
1119         memset(&fl, 0, sizeof fl);
1120         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1121         if (ip_route_output_key(&init_net, &rt, &fl)) {
1122                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1123                                 __func__, dst_ip);
1124                 return rc;
1125         }
1126
1127         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1128         if (neigh) {
1129                 if (neigh->nud_state & NUD_VALID) {
1130                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1131                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1132                                   neigh->ha, ntohl(rt->rt_gateway));
1133                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1134                                              dst_ip, NES_ARP_ADD);
1135                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1136                                            NES_ARP_RESOLVE);
1137                 }
1138                 neigh_release(neigh);
1139         }
1140
1141         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1142                 neigh_event_send(rt->u.dst.neighbour, NULL);
1143
1144         ip_rt_put(rt);
1145         return rc;
1146 }
1147
1148
1149 /**
1150  * make_cm_node - create a new instance of a cm node
1151  */
1152 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1153                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1154                 struct nes_cm_listener *listener)
1155 {
1156         struct nes_cm_node *cm_node;
1157         struct timespec ts;
1158         int arpindex = 0;
1159         struct nes_device *nesdev;
1160         struct nes_adapter *nesadapter;
1161
1162         /* create an hte and cm_node for this instance */
1163         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1164         if (!cm_node)
1165                 return NULL;
1166
1167         /* set our node specific transport info */
1168         cm_node->loc_addr = cm_info->loc_addr;
1169         cm_node->rem_addr = cm_info->rem_addr;
1170         cm_node->loc_port = cm_info->loc_port;
1171         cm_node->rem_port = cm_info->rem_port;
1172         cm_node->send_write0 = send_first;
1173         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1174                   &cm_node->loc_addr, cm_node->loc_port,
1175                   &cm_node->rem_addr, cm_node->rem_port);
1176         cm_node->listener = listener;
1177         cm_node->netdev = nesvnic->netdev;
1178         cm_node->cm_id = cm_info->cm_id;
1179         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1180
1181         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1182                         cm_node->cm_id);
1183
1184         spin_lock_init(&cm_node->retrans_list_lock);
1185
1186         cm_node->loopbackpartner = NULL;
1187         atomic_set(&cm_node->ref_count, 1);
1188         /* associate our parent CM core */
1189         cm_node->cm_core = cm_core;
1190         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1191         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1192         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1193                         NES_CM_DEFAULT_RCV_WND_SCALE;
1194         ts = current_kernel_time();
1195         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1196         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1197                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1198         cm_node->tcp_cntxt.rcv_nxt = 0;
1199         /* get a unique session ID , add thread_id to an upcounter to handle race */
1200         atomic_inc(&cm_core->node_cnt);
1201         cm_node->conn_type = cm_info->conn_type;
1202         cm_node->apbvt_set = 0;
1203         cm_node->accept_pend = 0;
1204
1205         cm_node->nesvnic = nesvnic;
1206         /* get some device handles, for arp lookup */
1207         nesdev = nesvnic->nesdev;
1208         nesadapter = nesdev->nesadapter;
1209
1210         cm_node->loopbackpartner = NULL;
1211         /* get the mac addr for the remote node */
1212         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1213                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1214         else
1215                 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1216         if (arpindex < 0) {
1217                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1218                 if (arpindex < 0) {
1219                         kfree(cm_node);
1220                         return NULL;
1221                 }
1222         }
1223
1224         /* copy the mac addr to node context */
1225         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1226         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1227                   cm_node->rem_mac);
1228
1229         add_hte_node(cm_core, cm_node);
1230         atomic_inc(&cm_nodes_created);
1231
1232         return cm_node;
1233 }
1234
1235
1236 /**
1237  * add_ref_cm_node - destroy an instance of a cm node
1238  */
1239 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1240 {
1241         atomic_inc(&cm_node->ref_count);
1242         return 0;
1243 }
1244
1245
1246 /**
1247  * rem_ref_cm_node - destroy an instance of a cm node
1248  */
1249 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1250         struct nes_cm_node *cm_node)
1251 {
1252         unsigned long flags;
1253         struct nes_qp *nesqp;
1254
1255         if (!cm_node)
1256                 return -EINVAL;
1257
1258         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1259         if (atomic_dec_return(&cm_node->ref_count)) {
1260                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1261                 return 0;
1262         }
1263         list_del(&cm_node->list);
1264         atomic_dec(&cm_core->ht_node_cnt);
1265         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1266
1267         /* if the node is destroyed before connection was accelerated */
1268         if (!cm_node->accelerated && cm_node->accept_pend) {
1269                 BUG_ON(!cm_node->listener);
1270                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1271                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1272         }
1273         WARN_ON(cm_node->send_entry);
1274         if (cm_node->recv_entry)
1275                 handle_recv_entry(cm_node, 0);
1276         if (cm_node->listener) {
1277                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1278         } else {
1279                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1280                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1281                                 PCI_FUNC(
1282                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1283                                 NES_MANAGE_APBVT_DEL);
1284                 }
1285         }
1286
1287         atomic_dec(&cm_core->node_cnt);
1288         atomic_inc(&cm_nodes_destroyed);
1289         nesqp = cm_node->nesqp;
1290         if (nesqp) {
1291                 nesqp->cm_node = NULL;
1292                 nes_rem_ref(&nesqp->ibqp);
1293                 cm_node->nesqp = NULL;
1294         }
1295
1296         kfree(cm_node);
1297         return 0;
1298 }
1299
1300 /**
1301  * process_options
1302  */
1303 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1304         u32 optionsize, u32 syn_packet)
1305 {
1306         u32 tmp;
1307         u32 offset = 0;
1308         union all_known_options *all_options;
1309         char got_mss_option = 0;
1310
1311         while (offset < optionsize) {
1312                 all_options = (union all_known_options *)(optionsloc + offset);
1313                 switch (all_options->as_base.optionnum) {
1314                 case OPTION_NUMBER_END:
1315                         offset = optionsize;
1316                         break;
1317                 case OPTION_NUMBER_NONE:
1318                         offset += 1;
1319                         continue;
1320                 case OPTION_NUMBER_MSS:
1321                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1322                                 "Size: %d\n", __func__,
1323                                 all_options->as_mss.length, offset, optionsize);
1324                         got_mss_option = 1;
1325                         if (all_options->as_mss.length != 4) {
1326                                 return 1;
1327                         } else {
1328                                 tmp = ntohs(all_options->as_mss.mss);
1329                                 if (tmp > 0 && tmp <
1330                                         cm_node->tcp_cntxt.mss)
1331                                         cm_node->tcp_cntxt.mss = tmp;
1332                         }
1333                         break;
1334                 case OPTION_NUMBER_WINDOW_SCALE:
1335                         cm_node->tcp_cntxt.snd_wscale =
1336                                 all_options->as_windowscale.shiftcount;
1337                         break;
1338                 case OPTION_NUMBER_WRITE0:
1339                         cm_node->send_write0 = 1;
1340                         break;
1341                 default:
1342                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1343                                 all_options->as_base.optionnum);
1344                         break;
1345                 }
1346                 offset += all_options->as_base.length;
1347         }
1348         if ((!got_mss_option) && (syn_packet))
1349                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1350         return 0;
1351 }
1352
1353 static void drop_packet(struct sk_buff *skb)
1354 {
1355         atomic_inc(&cm_accel_dropped_pkts);
1356         dev_kfree_skb_any(skb);
1357 }
1358
1359 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1360 {
1361         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1362                 "refcnt=%d\n", cm_node, cm_node->state,
1363                 atomic_read(&cm_node->ref_count));
1364         switch (cm_node->state) {
1365         case NES_CM_STATE_SYN_RCVD:
1366         case NES_CM_STATE_SYN_SENT:
1367         case NES_CM_STATE_ESTABLISHED:
1368         case NES_CM_STATE_MPAREQ_SENT:
1369         case NES_CM_STATE_MPAREJ_RCVD:
1370                 cm_node->tcp_cntxt.rcv_nxt++;
1371                 cleanup_retrans_entry(cm_node);
1372                 cm_node->state = NES_CM_STATE_LAST_ACK;
1373                 send_fin(cm_node, NULL);
1374                 break;
1375         case NES_CM_STATE_FIN_WAIT1:
1376                 cm_node->tcp_cntxt.rcv_nxt++;
1377                 cleanup_retrans_entry(cm_node);
1378                 cm_node->state = NES_CM_STATE_CLOSING;
1379                 send_ack(cm_node, NULL);
1380                 /* Wait for ACK as this is simultanous close..
1381                 * After we receive ACK, do not send anything..
1382                 * Just rm the node.. Done.. */
1383                 break;
1384         case NES_CM_STATE_FIN_WAIT2:
1385                 cm_node->tcp_cntxt.rcv_nxt++;
1386                 cleanup_retrans_entry(cm_node);
1387                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1388                 send_ack(cm_node, NULL);
1389                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1390                 break;
1391         case NES_CM_STATE_TIME_WAIT:
1392                 cm_node->tcp_cntxt.rcv_nxt++;
1393                 cleanup_retrans_entry(cm_node);
1394                 cm_node->state = NES_CM_STATE_CLOSED;
1395                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1396                 break;
1397         case NES_CM_STATE_TSA:
1398         default:
1399                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1400                         cm_node, cm_node->state);
1401                 break;
1402         }
1403 }
1404
1405
1406 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1407         struct tcphdr *tcph)
1408 {
1409
1410         int     reset = 0;      /* whether to send reset in case of err.. */
1411         int     passive_state;
1412         atomic_inc(&cm_resets_recvd);
1413         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1414                         " refcnt=%d\n", cm_node, cm_node->state,
1415                         atomic_read(&cm_node->ref_count));
1416         cleanup_retrans_entry(cm_node);
1417         switch (cm_node->state) {
1418         case NES_CM_STATE_SYN_SENT:
1419         case NES_CM_STATE_MPAREQ_SENT:
1420                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1421                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1422                         cm_node->listener, cm_node->state);
1423                 active_open_err(cm_node, skb, reset);
1424                 break;
1425         case NES_CM_STATE_MPAREQ_RCVD:
1426                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1427                 if (passive_state ==  NES_SEND_RESET_EVENT)
1428                         create_event(cm_node, NES_CM_EVENT_RESET);
1429                 cm_node->state = NES_CM_STATE_CLOSED;
1430                 dev_kfree_skb_any(skb);
1431                 break;
1432         case NES_CM_STATE_ESTABLISHED:
1433         case NES_CM_STATE_SYN_RCVD:
1434         case NES_CM_STATE_LISTENING:
1435                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1436                 passive_open_err(cm_node, skb, reset);
1437                 break;
1438         case NES_CM_STATE_TSA:
1439                 active_open_err(cm_node, skb, reset);
1440                 break;
1441         case NES_CM_STATE_CLOSED:
1442                 drop_packet(skb);
1443                 break;
1444         case NES_CM_STATE_FIN_WAIT1:
1445         case NES_CM_STATE_LAST_ACK:
1446                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1447         case NES_CM_STATE_TIME_WAIT:
1448                 cm_node->state = NES_CM_STATE_CLOSED;
1449                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1450                 drop_packet(skb);
1451                 break;
1452         default:
1453                 drop_packet(skb);
1454                 break;
1455         }
1456 }
1457
1458
1459 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1460 {
1461
1462         int     ret = 0;
1463         int datasize = skb->len;
1464         u8 *dataloc = skb->data;
1465
1466         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1467         u32     res_type;
1468         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1469         if (ret) {
1470                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1471                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1472                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1473                                 "cm_node=%p listener=%p state=%d\n", __func__,
1474                                 __LINE__, cm_node, cm_node->listener,
1475                                 cm_node->state);
1476                         active_open_err(cm_node, skb, 1);
1477                 } else {
1478                         passive_open_err(cm_node, skb, 1);
1479                 }
1480                 return;
1481         }
1482
1483         switch (cm_node->state) {
1484         case NES_CM_STATE_ESTABLISHED:
1485                 if (res_type == NES_MPA_REQUEST_REJECT) {
1486                         /*BIG problem as we are receiving the MPA.. So should
1487                         * not be REJECT.. This is Passive Open.. We can
1488                         * only receive it Reject for Active Open...*/
1489                         WARN_ON(1);
1490                 }
1491                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1492                 type = NES_CM_EVENT_MPA_REQ;
1493                 atomic_set(&cm_node->passive_state,
1494                                 NES_PASSIVE_STATE_INDICATED);
1495                 break;
1496         case NES_CM_STATE_MPAREQ_SENT:
1497                 cleanup_retrans_entry(cm_node);
1498                 if (res_type == NES_MPA_REQUEST_REJECT) {
1499                         type = NES_CM_EVENT_MPA_REJECT;
1500                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1501                 } else {
1502                         type = NES_CM_EVENT_CONNECTED;
1503                         cm_node->state = NES_CM_STATE_TSA;
1504                 }
1505
1506                 break;
1507         default:
1508                 WARN_ON(1);
1509                 break;
1510         }
1511         dev_kfree_skb_any(skb);
1512         create_event(cm_node, type);
1513 }
1514
1515 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1516 {
1517         switch (cm_node->state) {
1518         case NES_CM_STATE_SYN_SENT:
1519         case NES_CM_STATE_MPAREQ_SENT:
1520                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1521                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1522                         cm_node->listener, cm_node->state);
1523                 active_open_err(cm_node, skb, 1);
1524                 break;
1525         case NES_CM_STATE_ESTABLISHED:
1526         case NES_CM_STATE_SYN_RCVD:
1527                 passive_open_err(cm_node, skb, 1);
1528                 break;
1529         case NES_CM_STATE_TSA:
1530         default:
1531                 drop_packet(skb);
1532         }
1533 }
1534
1535 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1536         struct sk_buff *skb)
1537 {
1538         int err;
1539
1540         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1541         if (err)
1542                 active_open_err(cm_node, skb, 1);
1543
1544         return err;
1545 }
1546
1547 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1548         struct sk_buff *skb)
1549 {
1550         int err = 0;
1551         u32 seq;
1552         u32 ack_seq;
1553         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1554         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1555         u32 rcv_wnd;
1556         seq = ntohl(tcph->seq);
1557         ack_seq = ntohl(tcph->ack_seq);
1558         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1559         if (ack_seq != loc_seq_num)
1560                 err = 1;
1561         else if (!between(seq, rcv_nxt, (rcv_nxt+rcv_wnd)))
1562                 err = 1;
1563         if (err) {
1564                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1565                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1566                         cm_node->listener, cm_node->state);
1567                 indicate_pkt_err(cm_node, skb);
1568                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1569                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1570                         rcv_wnd);
1571         }
1572         return err;
1573 }
1574
1575 /*
1576  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1577  * is created with a listener or it may comein as rexmitted packet which in
1578  * that case will be just dropped.
1579  */
1580
1581 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1582         struct tcphdr *tcph)
1583 {
1584         int ret;
1585         u32 inc_sequence;
1586         int optionsize;
1587
1588         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1589         skb_trim(skb, 0);
1590         inc_sequence = ntohl(tcph->seq);
1591
1592         switch (cm_node->state) {
1593         case NES_CM_STATE_SYN_SENT:
1594         case NES_CM_STATE_MPAREQ_SENT:
1595                 /* Rcvd syn on active open connection*/
1596                 active_open_err(cm_node, skb, 1);
1597                 break;
1598         case NES_CM_STATE_LISTENING:
1599                 /* Passive OPEN */
1600                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1601                                 cm_node->listener->backlog) {
1602                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1603                                 "pressure \n");
1604                         cm_backlog_drops++;
1605                         passive_open_err(cm_node, skb, 0);
1606                         break;
1607                 }
1608                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1609                         1);
1610                 if (ret) {
1611                         passive_open_err(cm_node, skb, 0);
1612                         /* drop pkt */
1613                         break;
1614                 }
1615                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1616                 BUG_ON(cm_node->send_entry);
1617                 cm_node->accept_pend = 1;
1618                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1619
1620                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1621                 send_syn(cm_node, 1, skb);
1622                 break;
1623         case NES_CM_STATE_CLOSED:
1624                 cleanup_retrans_entry(cm_node);
1625                 send_reset(cm_node, skb);
1626                 break;
1627         case NES_CM_STATE_TSA:
1628         case NES_CM_STATE_ESTABLISHED:
1629         case NES_CM_STATE_FIN_WAIT1:
1630         case NES_CM_STATE_FIN_WAIT2:
1631         case NES_CM_STATE_MPAREQ_RCVD:
1632         case NES_CM_STATE_LAST_ACK:
1633         case NES_CM_STATE_CLOSING:
1634         case NES_CM_STATE_UNKNOWN:
1635         default:
1636                 drop_packet(skb);
1637                 break;
1638         }
1639 }
1640
1641 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1642         struct tcphdr *tcph)
1643 {
1644
1645         int ret;
1646         u32 inc_sequence;
1647         int optionsize;
1648
1649         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1650         skb_trim(skb, 0);
1651         inc_sequence = ntohl(tcph->seq);
1652         switch (cm_node->state) {
1653         case NES_CM_STATE_SYN_SENT:
1654                 cleanup_retrans_entry(cm_node);
1655                 /* active open */
1656                 if (check_syn(cm_node, tcph, skb))
1657                         return;
1658                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1659                 /* setup options */
1660                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1661                 if (ret) {
1662                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1663                                 cm_node);
1664                         break;
1665                 }
1666                 cleanup_retrans_entry(cm_node);
1667                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1668                 send_mpa_request(cm_node, skb);
1669                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1670                 break;
1671         case NES_CM_STATE_MPAREQ_RCVD:
1672                 /* passive open, so should not be here */
1673                 passive_open_err(cm_node, skb, 1);
1674                 break;
1675         case NES_CM_STATE_LISTENING:
1676         case NES_CM_STATE_CLOSED:
1677                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1678                 cleanup_retrans_entry(cm_node);
1679                 send_reset(cm_node, skb);
1680                 break;
1681         case NES_CM_STATE_ESTABLISHED:
1682         case NES_CM_STATE_FIN_WAIT1:
1683         case NES_CM_STATE_FIN_WAIT2:
1684         case NES_CM_STATE_LAST_ACK:
1685         case NES_CM_STATE_TSA:
1686         case NES_CM_STATE_CLOSING:
1687         case NES_CM_STATE_UNKNOWN:
1688         case NES_CM_STATE_MPAREQ_SENT:
1689         default:
1690                 drop_packet(skb);
1691                 break;
1692         }
1693 }
1694
1695 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1696         struct tcphdr *tcph)
1697 {
1698         int datasize = 0;
1699         u32 inc_sequence;
1700         u32 rem_seq_ack;
1701         u32 rem_seq;
1702         int ret = 0;
1703         int optionsize;
1704         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1705
1706         if (check_seq(cm_node, tcph, skb))
1707                 return -EINVAL;
1708
1709         skb_pull(skb, tcph->doff << 2);
1710         inc_sequence = ntohl(tcph->seq);
1711         rem_seq = ntohl(tcph->seq);
1712         rem_seq_ack =  ntohl(tcph->ack_seq);
1713         datasize = skb->len;
1714         switch (cm_node->state) {
1715         case NES_CM_STATE_SYN_RCVD:
1716                 /* Passive OPEN */
1717                 cleanup_retrans_entry(cm_node);
1718                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1719                 if (ret)
1720                         break;
1721                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1722                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1723                 if (datasize) {
1724                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1725                         handle_rcv_mpa(cm_node, skb);
1726                 } else  /* rcvd ACK only */
1727                         dev_kfree_skb_any(skb);
1728                 break;
1729         case NES_CM_STATE_ESTABLISHED:
1730                 /* Passive OPEN */
1731                 cleanup_retrans_entry(cm_node);
1732                 if (datasize) {
1733                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1734                         handle_rcv_mpa(cm_node, skb);
1735                 } else
1736                         drop_packet(skb);
1737                 break;
1738         case NES_CM_STATE_MPAREQ_SENT:
1739                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1740                 if (datasize) {
1741                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1742                         handle_rcv_mpa(cm_node, skb);
1743                 } else  /* Could be just an ack pkt.. */
1744                         dev_kfree_skb_any(skb);
1745                 break;
1746         case NES_CM_STATE_LISTENING:
1747         case NES_CM_STATE_CLOSED:
1748                 cleanup_retrans_entry(cm_node);
1749                 send_reset(cm_node, skb);
1750                 break;
1751         case NES_CM_STATE_LAST_ACK:
1752         case NES_CM_STATE_CLOSING:
1753                 cleanup_retrans_entry(cm_node);
1754                 cm_node->state = NES_CM_STATE_CLOSED;
1755                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1756                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1757                 drop_packet(skb);
1758                 break;
1759         case NES_CM_STATE_FIN_WAIT1:
1760                 cleanup_retrans_entry(cm_node);
1761                 drop_packet(skb);
1762                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1763                 break;
1764         case NES_CM_STATE_SYN_SENT:
1765         case NES_CM_STATE_FIN_WAIT2:
1766         case NES_CM_STATE_TSA:
1767         case NES_CM_STATE_MPAREQ_RCVD:
1768         case NES_CM_STATE_UNKNOWN:
1769         default:
1770                 cleanup_retrans_entry(cm_node);
1771                 drop_packet(skb);
1772                 break;
1773         }
1774         return ret;
1775 }
1776
1777
1778
1779 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1780         struct sk_buff *skb, int optionsize, int passive)
1781 {
1782         u8 *optionsloc = (u8 *)&tcph[1];
1783         if (optionsize) {
1784                 if (process_options(cm_node, optionsloc, optionsize,
1785                         (u32)tcph->syn)) {
1786                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1787                                 __func__, cm_node);
1788                         if (passive)
1789                                 passive_open_err(cm_node, skb, 1);
1790                         else
1791                                 active_open_err(cm_node, skb, 1);
1792                         return 1;
1793                 }
1794         }
1795
1796         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1797                         cm_node->tcp_cntxt.snd_wscale;
1798
1799         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1800                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1801         return 0;
1802 }
1803
1804 /*
1805  * active_open_err() will send reset() if flag set..
1806  * It will also send ABORT event.
1807  */
1808
1809 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1810         int reset)
1811 {
1812         cleanup_retrans_entry(cm_node);
1813         if (reset) {
1814                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1815                                 "state=%d\n", cm_node, cm_node->state);
1816                 add_ref_cm_node(cm_node);
1817                 send_reset(cm_node, skb);
1818         } else
1819                 dev_kfree_skb_any(skb);
1820
1821         cm_node->state = NES_CM_STATE_CLOSED;
1822         create_event(cm_node, NES_CM_EVENT_ABORTED);
1823 }
1824
1825 /*
1826  * passive_open_err() will either do a reset() or will free up the skb and
1827  * remove the cm_node.
1828  */
1829
1830 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1831         int reset)
1832 {
1833         cleanup_retrans_entry(cm_node);
1834         cm_node->state = NES_CM_STATE_CLOSED;
1835         if (reset) {
1836                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1837                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1838                 send_reset(cm_node, skb);
1839         } else {
1840                 dev_kfree_skb_any(skb);
1841                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1842         }
1843 }
1844
1845 /*
1846  * free_retrans_entry() routines assumes that the retrans_list_lock has
1847  * been acquired before calling.
1848  */
1849 static void free_retrans_entry(struct nes_cm_node *cm_node)
1850 {
1851         struct nes_timer_entry *send_entry;
1852         send_entry = cm_node->send_entry;
1853         if (send_entry) {
1854                 cm_node->send_entry = NULL;
1855                 dev_kfree_skb_any(send_entry->skb);
1856                 kfree(send_entry);
1857                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1858         }
1859 }
1860
1861 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1862 {
1863         unsigned long flags;
1864
1865         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1866         free_retrans_entry(cm_node);
1867         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1868 }
1869
1870 /**
1871  * process_packet
1872  * Returns skb if to be freed, else it will return NULL if already used..
1873  */
1874 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1875         struct nes_cm_core *cm_core)
1876 {
1877         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1878         struct tcphdr *tcph = tcp_hdr(skb);
1879         u32     fin_set = 0;
1880         int ret = 0;
1881         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1882
1883         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1884                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1885                 tcph->ack, tcph->rst, tcph->fin);
1886
1887         if (tcph->rst)
1888                 pkt_type = NES_PKT_TYPE_RST;
1889         else if (tcph->syn) {
1890                 pkt_type = NES_PKT_TYPE_SYN;
1891                 if (tcph->ack)
1892                         pkt_type = NES_PKT_TYPE_SYNACK;
1893         } else if (tcph->ack)
1894                 pkt_type = NES_PKT_TYPE_ACK;
1895         if (tcph->fin)
1896                 fin_set = 1;
1897
1898         switch (pkt_type) {
1899         case NES_PKT_TYPE_SYN:
1900                 handle_syn_pkt(cm_node, skb, tcph);
1901                 break;
1902         case NES_PKT_TYPE_SYNACK:
1903                 handle_synack_pkt(cm_node, skb, tcph);
1904                 break;
1905         case NES_PKT_TYPE_ACK:
1906                 ret = handle_ack_pkt(cm_node, skb, tcph);
1907                 if (fin_set && !ret)
1908                         handle_fin_pkt(cm_node);
1909                 break;
1910         case NES_PKT_TYPE_RST:
1911                 handle_rst_pkt(cm_node, skb, tcph);
1912                 break;
1913         default:
1914                 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
1915                         handle_fin_pkt(cm_node);
1916                 drop_packet(skb);
1917                 break;
1918         }
1919 }
1920
1921 /**
1922  * mini_cm_listen - create a listen node with params
1923  */
1924 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1925         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1926 {
1927         struct nes_cm_listener *listener;
1928         unsigned long flags;
1929
1930         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1931                 cm_info->loc_addr, cm_info->loc_port);
1932
1933         /* cannot have multiple matching listeners */
1934         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1935                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1936         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1937                 /* find automatically incs ref count ??? */
1938                 atomic_dec(&listener->ref_count);
1939                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1940                 return NULL;
1941         }
1942
1943         if (!listener) {
1944                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1945                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1946                 if (!listener) {
1947                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1948                         return NULL;
1949                 }
1950
1951                 listener->loc_addr = htonl(cm_info->loc_addr);
1952                 listener->loc_port = htons(cm_info->loc_port);
1953                 listener->reused_node = 0;
1954
1955                 atomic_set(&listener->ref_count, 1);
1956         }
1957         /* pasive case */
1958         /* find already inc'ed the ref count */
1959         else {
1960                 listener->reused_node = 1;
1961         }
1962
1963         listener->cm_id = cm_info->cm_id;
1964         atomic_set(&listener->pend_accepts_cnt, 0);
1965         listener->cm_core = cm_core;
1966         listener->nesvnic = nesvnic;
1967         atomic_inc(&cm_core->node_cnt);
1968
1969         listener->conn_type = cm_info->conn_type;
1970         listener->backlog = cm_info->backlog;
1971         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1972
1973         if (!listener->reused_node) {
1974                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1975                 list_add(&listener->list, &cm_core->listen_list.list);
1976                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1977                 atomic_inc(&cm_core->listen_node_cnt);
1978         }
1979
1980         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1981                         " listener = %p, backlog = %d, cm_id = %p.\n",
1982                         cm_info->loc_addr, cm_info->loc_port,
1983                         listener, listener->backlog, listener->cm_id);
1984
1985         return listener;
1986 }
1987
1988
1989 /**
1990  * mini_cm_connect - make a connection node with params
1991  */
1992 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1993         struct nes_vnic *nesvnic, u16 private_data_len,
1994         void *private_data, struct nes_cm_info *cm_info)
1995 {
1996         int ret = 0;
1997         struct nes_cm_node *cm_node;
1998         struct nes_cm_listener *loopbackremotelistener;
1999         struct nes_cm_node *loopbackremotenode;
2000         struct nes_cm_info loopback_cm_info;
2001         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
2002         struct ietf_mpa_frame *mpa_frame = NULL;
2003
2004         /* create a CM connection node */
2005         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2006         if (!cm_node)
2007                 return NULL;
2008         mpa_frame = &cm_node->mpa_frame;
2009         memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
2010         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
2011         mpa_frame->rev =  IETF_MPA_VERSION;
2012         mpa_frame->priv_data_len = htons(private_data_len);
2013
2014         /* set our node side to client (active) side */
2015         cm_node->tcp_cntxt.client = 1;
2016         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2017
2018         if (cm_info->loc_addr == cm_info->rem_addr) {
2019                 loopbackremotelistener = find_listener(cm_core,
2020                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2021                                 NES_CM_LISTENER_ACTIVE_STATE);
2022                 if (loopbackremotelistener == NULL) {
2023                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2024                 } else {
2025                         loopback_cm_info = *cm_info;
2026                         loopback_cm_info.loc_port = cm_info->rem_port;
2027                         loopback_cm_info.rem_port = cm_info->loc_port;
2028                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2029                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2030                                 &loopback_cm_info, loopbackremotelistener);
2031                         if (!loopbackremotenode) {
2032                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2033                                 return NULL;
2034                         }
2035                         atomic_inc(&cm_loopbacks);
2036                         loopbackremotenode->loopbackpartner = cm_node;
2037                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2038                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2039                         cm_node->loopbackpartner = loopbackremotenode;
2040                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2041                                 private_data_len);
2042                         loopbackremotenode->mpa_frame_size = private_data_len;
2043
2044                         /* we are done handling this state. */
2045                         /* set node to a TSA state */
2046                         cm_node->state = NES_CM_STATE_TSA;
2047                         cm_node->tcp_cntxt.rcv_nxt =
2048                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2049                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2050                                 cm_node->tcp_cntxt.loc_seq_num;
2051                         cm_node->tcp_cntxt.max_snd_wnd =
2052                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2053                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2054                                 cm_node->tcp_cntxt.rcv_wnd;
2055                         cm_node->tcp_cntxt.snd_wnd =
2056                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2057                         loopbackremotenode->tcp_cntxt.snd_wnd =
2058                                 cm_node->tcp_cntxt.rcv_wnd;
2059                         cm_node->tcp_cntxt.snd_wscale =
2060                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2061                         loopbackremotenode->tcp_cntxt.snd_wscale =
2062                                 cm_node->tcp_cntxt.rcv_wscale;
2063                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2064                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2065                 }
2066                 return cm_node;
2067         }
2068
2069         /* set our node side to client (active) side */
2070         cm_node->tcp_cntxt.client = 1;
2071         /* init our MPA frame ptr */
2072         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2073
2074         cm_node->mpa_frame_size = mpa_frame_size;
2075
2076         /* send a syn and goto syn sent state */
2077         cm_node->state = NES_CM_STATE_SYN_SENT;
2078         ret = send_syn(cm_node, 0, NULL);
2079
2080         if (ret) {
2081                 /* error in sending the syn free up the cm_node struct */
2082                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2083                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2084                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2085                         cm_node->cm_id);
2086                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2087                 cm_node = NULL;
2088         }
2089
2090         if (cm_node)
2091                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2092                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2093                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2094                         cm_node->cm_id);
2095
2096         return cm_node;
2097 }
2098
2099
2100 /**
2101  * mini_cm_accept - accept a connection
2102  * This function is never called
2103  */
2104 static int mini_cm_accept(struct nes_cm_core *cm_core,
2105         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2106 {
2107         return 0;
2108 }
2109
2110
2111 /**
2112  * mini_cm_reject - reject and teardown a connection
2113  */
2114 static int mini_cm_reject(struct nes_cm_core *cm_core,
2115         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2116 {
2117         int ret = 0;
2118         int err = 0;
2119         int passive_state;
2120         struct nes_cm_event event;
2121         struct iw_cm_id *cm_id = cm_node->cm_id;
2122         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2123
2124         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2125                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2126
2127         if (cm_node->tcp_cntxt.client)
2128                 return ret;
2129         cleanup_retrans_entry(cm_node);
2130
2131         if (!loopback) {
2132                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2133                 if (passive_state == NES_SEND_RESET_EVENT) {
2134                         cm_node->state = NES_CM_STATE_CLOSED;
2135                         rem_ref_cm_node(cm_core, cm_node);
2136                 } else {
2137                         if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2138                                 rem_ref_cm_node(cm_core, cm_node);
2139                         } else {
2140                                 ret = send_mpa_reject(cm_node);
2141                                 if (ret) {
2142                                         cm_node->state = NES_CM_STATE_CLOSED;
2143                                         err = send_reset(cm_node, NULL);
2144                                         if (err)
2145                                                 WARN_ON(1);
2146                                 } else
2147                                         cm_id->add_ref(cm_id);
2148                         }
2149                 }
2150         } else {
2151                 cm_node->cm_id = NULL;
2152                 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2153                         rem_ref_cm_node(cm_core, cm_node);
2154                         rem_ref_cm_node(cm_core, loopback);
2155                 } else {
2156                         event.cm_node = loopback;
2157                         event.cm_info.rem_addr = loopback->rem_addr;
2158                         event.cm_info.loc_addr = loopback->loc_addr;
2159                         event.cm_info.rem_port = loopback->rem_port;
2160                         event.cm_info.loc_port = loopback->loc_port;
2161                         event.cm_info.cm_id = loopback->cm_id;
2162                         cm_event_mpa_reject(&event);
2163                         rem_ref_cm_node(cm_core, cm_node);
2164                         loopback->state = NES_CM_STATE_CLOSING;
2165
2166                         cm_id = loopback->cm_id;
2167                         rem_ref_cm_node(cm_core, loopback);
2168                         cm_id->rem_ref(cm_id);
2169                 }
2170         }
2171
2172         return ret;
2173 }
2174
2175
2176 /**
2177  * mini_cm_close
2178  */
2179 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2180 {
2181         int ret = 0;
2182
2183         if (!cm_core || !cm_node)
2184                 return -EINVAL;
2185
2186         switch (cm_node->state) {
2187         case NES_CM_STATE_SYN_RCVD:
2188         case NES_CM_STATE_SYN_SENT:
2189         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2190         case NES_CM_STATE_ESTABLISHED:
2191         case NES_CM_STATE_ACCEPTING:
2192         case NES_CM_STATE_MPAREQ_SENT:
2193         case NES_CM_STATE_MPAREQ_RCVD:
2194                 cleanup_retrans_entry(cm_node);
2195                 send_reset(cm_node, NULL);
2196                 break;
2197         case NES_CM_STATE_CLOSE_WAIT:
2198                 cm_node->state = NES_CM_STATE_LAST_ACK;
2199                 send_fin(cm_node, NULL);
2200                 break;
2201         case NES_CM_STATE_FIN_WAIT1:
2202         case NES_CM_STATE_FIN_WAIT2:
2203         case NES_CM_STATE_LAST_ACK:
2204         case NES_CM_STATE_TIME_WAIT:
2205         case NES_CM_STATE_CLOSING:
2206                 ret = -1;
2207                 break;
2208         case NES_CM_STATE_MPAREJ_RCVD:
2209         case NES_CM_STATE_LISTENING:
2210         case NES_CM_STATE_UNKNOWN:
2211         case NES_CM_STATE_INITED:
2212         case NES_CM_STATE_CLOSED:
2213         case NES_CM_STATE_LISTENER_DESTROYED:
2214                 ret = rem_ref_cm_node(cm_core, cm_node);
2215                 break;
2216         case NES_CM_STATE_TSA:
2217                 if (cm_node->send_entry)
2218                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2219                                 "send_entry=%p\n", cm_node->send_entry);
2220                 ret = rem_ref_cm_node(cm_core, cm_node);
2221                 break;
2222         }
2223         return ret;
2224 }
2225
2226
2227 /**
2228  * recv_pkt - recv an ETHERNET packet, and process it through CM
2229  * node state machine
2230  */
2231 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2232         struct nes_vnic *nesvnic, struct sk_buff *skb)
2233 {
2234         struct nes_cm_node *cm_node = NULL;
2235         struct nes_cm_listener *listener = NULL;
2236         struct iphdr *iph;
2237         struct tcphdr *tcph;
2238         struct nes_cm_info nfo;
2239         int skb_handled = 1;
2240         __be32 tmp_daddr, tmp_saddr;
2241
2242         if (!skb)
2243                 return 0;
2244         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2245                 return 0;
2246         }
2247
2248         iph = (struct iphdr *)skb->data;
2249         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2250
2251         nfo.loc_addr = ntohl(iph->daddr);
2252         nfo.loc_port = ntohs(tcph->dest);
2253         nfo.rem_addr = ntohl(iph->saddr);
2254         nfo.rem_port = ntohs(tcph->source);
2255
2256         tmp_daddr = cpu_to_be32(iph->daddr);
2257         tmp_saddr = cpu_to_be32(iph->saddr);
2258
2259         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2260                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2261
2262         do {
2263                 cm_node = find_node(cm_core,
2264                         nfo.rem_port, nfo.rem_addr,
2265                         nfo.loc_port, nfo.loc_addr);
2266
2267                 if (!cm_node) {
2268                         /* Only type of packet accepted are for */
2269                         /* the PASSIVE open (syn only) */
2270                         if ((!tcph->syn) || (tcph->ack)) {
2271                                 skb_handled = 0;
2272                                 break;
2273                         }
2274                         listener = find_listener(cm_core, nfo.loc_addr,
2275                                 nfo.loc_port,
2276                                 NES_CM_LISTENER_ACTIVE_STATE);
2277                         if (!listener) {
2278                                 nfo.cm_id = NULL;
2279                                 nfo.conn_type = 0;
2280                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2281                                 skb_handled = 0;
2282                                 break;
2283                         }
2284                         nfo.cm_id = listener->cm_id;
2285                         nfo.conn_type = listener->conn_type;
2286                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2287                                 listener);
2288                         if (!cm_node) {
2289                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2290                                         "node\n");
2291                                 cm_packets_dropped++;
2292                                 atomic_dec(&listener->ref_count);
2293                                 dev_kfree_skb_any(skb);
2294                                 break;
2295                         }
2296                         if (!tcph->rst && !tcph->fin) {
2297                                 cm_node->state = NES_CM_STATE_LISTENING;
2298                         } else {
2299                                 cm_packets_dropped++;
2300                                 rem_ref_cm_node(cm_core, cm_node);
2301                                 dev_kfree_skb_any(skb);
2302                                 break;
2303                         }
2304                         add_ref_cm_node(cm_node);
2305                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2306                         rem_ref_cm_node(cm_core, cm_node);
2307                         atomic_inc(&cm_accel_dropped_pkts);
2308                         dev_kfree_skb_any(skb);
2309                         break;
2310                 }
2311                 skb_reset_network_header(skb);
2312                 skb_set_transport_header(skb, sizeof(*tcph));
2313                 skb->len = ntohs(iph->tot_len);
2314                 process_packet(cm_node, skb, cm_core);
2315                 rem_ref_cm_node(cm_core, cm_node);
2316         } while (0);
2317         return skb_handled;
2318 }
2319
2320
2321 /**
2322  * nes_cm_alloc_core - allocate a top level instance of a cm core
2323  */
2324 static struct nes_cm_core *nes_cm_alloc_core(void)
2325 {
2326         struct nes_cm_core *cm_core;
2327
2328         /* setup the CM core */
2329         /* alloc top level core control structure */
2330         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2331         if (!cm_core)
2332                 return NULL;
2333
2334         INIT_LIST_HEAD(&cm_core->connected_nodes);
2335         init_timer(&cm_core->tcp_timer);
2336         cm_core->tcp_timer.function = nes_cm_timer_tick;
2337
2338         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2339         cm_core->state = NES_CM_STATE_INITED;
2340         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2341
2342         atomic_set(&cm_core->events_posted, 0);
2343
2344         cm_core->api = &nes_cm_api;
2345
2346         spin_lock_init(&cm_core->ht_lock);
2347         spin_lock_init(&cm_core->listen_list_lock);
2348
2349         INIT_LIST_HEAD(&cm_core->listen_list.list);
2350
2351         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2352
2353         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2354         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2355         cm_core->post_event = nes_cm_post_event;
2356         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2357         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2358
2359         print_core(cm_core);
2360         return cm_core;
2361 }
2362
2363
2364 /**
2365  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2366  */
2367 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2368 {
2369         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2370
2371         if (!cm_core)
2372                 return -EINVAL;
2373
2374         barrier();
2375
2376         if (timer_pending(&cm_core->tcp_timer)) {
2377                 del_timer(&cm_core->tcp_timer);
2378         }
2379
2380         destroy_workqueue(cm_core->event_wq);
2381         destroy_workqueue(cm_core->disconn_wq);
2382         nes_debug(NES_DBG_CM, "\n");
2383         kfree(cm_core);
2384
2385         return 0;
2386 }
2387
2388
2389 /**
2390  * mini_cm_get
2391  */
2392 static int mini_cm_get(struct nes_cm_core *cm_core)
2393 {
2394         return cm_core->state;
2395 }
2396
2397
2398 /**
2399  * mini_cm_set
2400  */
2401 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2402 {
2403         int ret = 0;
2404
2405         switch (type) {
2406         case NES_CM_SET_PKT_SIZE:
2407                 cm_core->mtu = value;
2408                 break;
2409         case NES_CM_SET_FREE_PKT_Q_SIZE:
2410                 cm_core->free_tx_pkt_max = value;
2411                 break;
2412         default:
2413                 /* unknown set option */
2414                 ret = -EINVAL;
2415         }
2416
2417         return ret;
2418 }
2419
2420
2421 /**
2422  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2423  * successfully exchanged when this is called
2424  */
2425 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2426 {
2427         int ret = 0;
2428
2429         if (!nesqp)
2430                 return -EINVAL;
2431
2432         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2433                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2434                         NES_QPCONTEXT_MISC_DROS);
2435
2436         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2437                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2438
2439         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2440
2441         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2442
2443         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2444                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2445
2446         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2447                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2448                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2449
2450         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2451                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2452                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2453
2454         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2455         nesqp->nesqp_context->ts_recent = 0;
2456         nesqp->nesqp_context->ts_age = 0;
2457         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2458         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2459         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2460         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2461                         cm_node->tcp_cntxt.rcv_wscale);
2462         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2463         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2464         nesqp->nesqp_context->srtt = 0;
2465         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2466         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2467         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2468         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2469         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2470         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2471
2472         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2473                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2474                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2475                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2476                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2477                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2478                         le32_to_cpu(nesqp->nesqp_context->misc));
2479         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2480         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2481         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2482
2483         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2484         cm_node->state = NES_CM_STATE_TSA;
2485
2486         return ret;
2487 }
2488
2489
2490 /**
2491  * nes_cm_disconn
2492  */
2493 int nes_cm_disconn(struct nes_qp *nesqp)
2494 {
2495         struct disconn_work *work;
2496
2497         work = kzalloc(sizeof *work, GFP_ATOMIC);
2498         if (!work)
2499                 return -ENOMEM; /* Timer will clean up */
2500
2501         nes_add_ref(&nesqp->ibqp);
2502         work->nesqp = nesqp;
2503         INIT_WORK(&work->work, nes_disconnect_worker);
2504         queue_work(g_cm_core->disconn_wq, &work->work);
2505         return 0;
2506 }
2507
2508
2509 /**
2510  * nes_disconnect_worker
2511  */
2512 static void nes_disconnect_worker(struct work_struct *work)
2513 {
2514         struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2515         struct nes_qp *nesqp = dwork->nesqp;
2516
2517         kfree(dwork);
2518         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2519                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2520         nes_cm_disconn_true(nesqp);
2521         nes_rem_ref(&nesqp->ibqp);
2522 }
2523
2524
2525 /**
2526  * nes_cm_disconn_true
2527  */
2528 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2529 {
2530         unsigned long flags;
2531         int ret = 0;
2532         struct iw_cm_id *cm_id;
2533         struct iw_cm_event cm_event;
2534         struct nes_vnic *nesvnic;
2535         u16 last_ae;
2536         u8 original_hw_tcp_state;
2537         u8 original_ibqp_state;
2538         enum iw_cm_event_type disconn_status = IW_CM_EVENT_STATUS_OK;
2539         int issue_disconn = 0;
2540         int issue_close = 0;
2541         int issue_flush = 0;
2542         u32 flush_q = NES_CQP_FLUSH_RQ;
2543         struct ib_event ibevent;
2544
2545         if (!nesqp) {
2546                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2547                 return -1;
2548         }
2549
2550         spin_lock_irqsave(&nesqp->lock, flags);
2551         cm_id = nesqp->cm_id;
2552         /* make sure we havent already closed this connection */
2553         if (!cm_id) {
2554                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2555                                 nesqp->hwqp.qp_id);
2556                 spin_unlock_irqrestore(&nesqp->lock, flags);
2557                 return -1;
2558         }
2559
2560         nesvnic = to_nesvnic(nesqp->ibqp.device);
2561         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2562
2563         original_hw_tcp_state = nesqp->hw_tcp_state;
2564         original_ibqp_state   = nesqp->ibqp_state;
2565         last_ae = nesqp->last_aeq;
2566
2567         if (nesqp->term_flags) {
2568                 issue_disconn = 1;
2569                 issue_close = 1;
2570                 nesqp->cm_id = NULL;
2571                 if (nesqp->flush_issued == 0) {
2572                         nesqp->flush_issued = 1;
2573                         issue_flush = 1;
2574                 }
2575         } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2576                         ((original_ibqp_state == IB_QPS_RTS) &&
2577                         (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2578                 issue_disconn = 1;
2579                 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2580                         disconn_status = IW_CM_EVENT_STATUS_RESET;
2581         }
2582
2583         if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2584                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2585                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2586                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2587                 issue_close = 1;
2588                 nesqp->cm_id = NULL;
2589                 if (nesqp->flush_issued == 0) {
2590                         nesqp->flush_issued = 1;
2591                         issue_flush = 1;
2592                 }
2593         }
2594
2595         spin_unlock_irqrestore(&nesqp->lock, flags);
2596
2597         if ((issue_flush) && (nesqp->destroyed == 0)) {
2598                 /* Flush the queue(s) */
2599                 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2600                         flush_q |= NES_CQP_FLUSH_SQ;
2601                 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2602
2603                 if (nesqp->term_flags) {
2604                         ibevent.device = nesqp->ibqp.device;
2605                         ibevent.event = nesqp->terminate_eventtype;
2606                         ibevent.element.qp = &nesqp->ibqp;
2607                         nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2608                 }
2609         }
2610
2611         if ((cm_id) && (cm_id->event_handler)) {
2612                 if (issue_disconn) {
2613                         atomic_inc(&cm_disconnects);
2614                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2615                         cm_event.status = disconn_status;
2616                         cm_event.local_addr = cm_id->local_addr;
2617                         cm_event.remote_addr = cm_id->remote_addr;
2618                         cm_event.private_data = NULL;
2619                         cm_event.private_data_len = 0;
2620
2621                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2622                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2623                                 "cm_id = %p, refcount = %u.\n",
2624                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2625                                 nesqp->hwqp.sq_tail, cm_id,
2626                                 atomic_read(&nesqp->refcount));
2627
2628                         ret = cm_id->event_handler(cm_id, &cm_event);
2629                         if (ret)
2630                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2631                                         "returned, ret=%d\n", ret);
2632                 }
2633
2634                 if (issue_close) {
2635                         atomic_inc(&cm_closes);
2636                         nes_disconnect(nesqp, 1);
2637
2638                         cm_id->provider_data = nesqp;
2639                         /* Send up the close complete event */
2640                         cm_event.event = IW_CM_EVENT_CLOSE;
2641                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2642                         cm_event.provider_data = cm_id->provider_data;
2643                         cm_event.local_addr = cm_id->local_addr;
2644                         cm_event.remote_addr = cm_id->remote_addr;
2645                         cm_event.private_data = NULL;
2646                         cm_event.private_data_len = 0;
2647
2648                         ret = cm_id->event_handler(cm_id, &cm_event);
2649                         if (ret) {
2650                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2651                         }
2652
2653                         cm_id->rem_ref(cm_id);
2654                 }
2655         }
2656
2657         return 0;
2658 }
2659
2660
2661 /**
2662  * nes_disconnect
2663  */
2664 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2665 {
2666         int ret = 0;
2667         struct nes_vnic *nesvnic;
2668         struct nes_device *nesdev;
2669         struct nes_ib_device *nesibdev;
2670
2671         nesvnic = to_nesvnic(nesqp->ibqp.device);
2672         if (!nesvnic)
2673                 return -EINVAL;
2674
2675         nesdev = nesvnic->nesdev;
2676         nesibdev = nesvnic->nesibdev;
2677
2678         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2679                         atomic_read(&nesvnic->netdev->refcnt));
2680
2681         if (nesqp->active_conn) {
2682
2683                 /* indicate this connection is NOT active */
2684                 nesqp->active_conn = 0;
2685         } else {
2686                 /* Need to free the Last Streaming Mode Message */
2687                 if (nesqp->ietf_frame) {
2688                         if (nesqp->lsmm_mr)
2689                                 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2690                         pci_free_consistent(nesdev->pcidev,
2691                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2692                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2693                 }
2694         }
2695
2696         /* close the CM node down if it is still active */
2697         if (nesqp->cm_node) {
2698                 nes_debug(NES_DBG_CM, "Call close API\n");
2699
2700                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2701         }
2702
2703         return ret;
2704 }
2705
2706
2707 /**
2708  * nes_accept
2709  */
2710 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2711 {
2712         u64 u64temp;
2713         struct ib_qp *ibqp;
2714         struct nes_qp *nesqp;
2715         struct nes_vnic *nesvnic;
2716         struct nes_device *nesdev;
2717         struct nes_cm_node *cm_node;
2718         struct nes_adapter *adapter;
2719         struct ib_qp_attr attr;
2720         struct iw_cm_event cm_event;
2721         struct nes_hw_qp_wqe *wqe;
2722         struct nes_v4_quad nes_quad;
2723         u32 crc_value;
2724         int ret;
2725         int passive_state;
2726         struct nes_ib_device *nesibdev;
2727         struct ib_mr *ibmr = NULL;
2728         struct ib_phys_buf ibphysbuf;
2729         struct nes_pd *nespd;
2730         u64 tagged_offset;
2731
2732         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2733         if (!ibqp)
2734                 return -EINVAL;
2735
2736         /* get all our handles */
2737         nesqp = to_nesqp(ibqp);
2738         nesvnic = to_nesvnic(nesqp->ibqp.device);
2739         nesdev = nesvnic->nesdev;
2740         adapter = nesdev->nesadapter;
2741
2742         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2743         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2744                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2745                 nesvnic->netdev->name);
2746
2747         if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
2748                 if (cm_node->loopbackpartner)
2749                         rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
2750                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2751                 return -EINVAL;
2752         }
2753
2754         /* associate the node with the QP */
2755         nesqp->cm_node = (void *)cm_node;
2756         cm_node->nesqp = nesqp;
2757
2758         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2759                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2760         atomic_inc(&cm_accepts);
2761
2762         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2763                         atomic_read(&nesvnic->netdev->refcnt));
2764
2765         /* allocate the ietf frame and space for private data */
2766         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2767                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2768                 &nesqp->ietf_frame_pbase);
2769
2770         if (!nesqp->ietf_frame) {
2771                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2772                         "data\n");
2773                 return -ENOMEM;
2774         }
2775
2776
2777         /* setup the MPA frame */
2778         nesqp->private_data_len = conn_param->private_data_len;
2779         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2780
2781         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2782                         conn_param->private_data_len);
2783
2784         nesqp->ietf_frame->priv_data_len =
2785                 cpu_to_be16(conn_param->private_data_len);
2786         nesqp->ietf_frame->rev = mpa_version;
2787         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2788
2789         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2790         wqe = &nesqp->hwqp.sq_vbase[0];
2791
2792         if (cm_id->remote_addr.sin_addr.s_addr !=
2793                         cm_id->local_addr.sin_addr.s_addr) {
2794                 u64temp = (unsigned long)nesqp;
2795                 nesibdev = nesvnic->nesibdev;
2796                 nespd = nesqp->nespd;
2797                 ibphysbuf.addr = nesqp->ietf_frame_pbase;
2798                 ibphysbuf.size = conn_param->private_data_len +
2799                                         sizeof(struct ietf_mpa_frame);
2800                 tagged_offset = (u64)(unsigned long)nesqp->ietf_frame;
2801                 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
2802                                                 &ibphysbuf, 1,
2803                                                 IB_ACCESS_LOCAL_WRITE,
2804                                                 &tagged_offset);
2805                 if (!ibmr) {
2806                         nes_debug(NES_DBG_CM, "Unable to register memory region"
2807                                         "for lSMM for cm_node = %p \n",
2808                                         cm_node);
2809                         pci_free_consistent(nesdev->pcidev,
2810                                 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2811                                 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2812                         return -ENOMEM;
2813                 }
2814
2815                 ibmr->pd = &nespd->ibpd;
2816                 ibmr->device = nespd->ibpd.device;
2817                 nesqp->lsmm_mr = ibmr;
2818
2819                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2820                 set_wqe_64bit_value(wqe->wqe_words,
2821                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2822                         u64temp);
2823                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2824                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2825                         NES_IWARP_SQ_WQE_WRPDU);
2826                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2827                         cpu_to_le32(conn_param->private_data_len +
2828                         sizeof(struct ietf_mpa_frame));
2829                 set_wqe_64bit_value(wqe->wqe_words,
2830                                         NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
2831                                         (u64)(unsigned long)nesqp->ietf_frame);
2832                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2833                         cpu_to_le32(conn_param->private_data_len +
2834                         sizeof(struct ietf_mpa_frame));
2835                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
2836
2837                 nesqp->nesqp_context->ird_ord_sizes |=
2838                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2839                         NES_QPCONTEXT_ORDIRD_WRPDU);
2840         } else {
2841                 nesqp->nesqp_context->ird_ord_sizes |=
2842                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2843         }
2844         nesqp->skip_lsmm = 1;
2845
2846
2847         /* Cache the cm_id in the qp */
2848         nesqp->cm_id = cm_id;
2849         cm_node->cm_id = cm_id;
2850
2851         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2852         cm_id->provider_data = nesqp;
2853         nesqp->active_conn   = 0;
2854
2855         if (cm_node->state == NES_CM_STATE_TSA)
2856                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2857                         cm_node);
2858
2859         nes_cm_init_tsa_conn(nesqp, cm_node);
2860
2861         nesqp->nesqp_context->tcpPorts[0] =
2862                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2863         nesqp->nesqp_context->tcpPorts[1] =
2864                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2865
2866         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2867                 nesqp->nesqp_context->ip0 =
2868                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2869         else
2870                 nesqp->nesqp_context->ip0 =
2871                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2872
2873         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2874                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2875                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2876
2877         nesqp->nesqp_context->arp_index_vlan |=
2878                 cpu_to_le32(nes_arp_table(nesdev,
2879                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2880                         NES_ARP_RESOLVE) << 16);
2881
2882         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2883                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2884
2885         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2886
2887         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2888                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2889         nesqp->nesqp_context->ird_ord_sizes |=
2890                 cpu_to_le32((u32)conn_param->ord);
2891
2892         memset(&nes_quad, 0, sizeof(nes_quad));
2893         nes_quad.DstIpAdrIndex =
2894                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2895         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2896                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2897         else
2898                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2899         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2900         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2901
2902         /* Produce hash key */
2903         crc_value = get_crc_value(&nes_quad);
2904         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2905         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2906                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2907
2908         nesqp->hte_index &= adapter->hte_index_mask;
2909         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2910
2911         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2912
2913         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2914                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2915                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2916                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2917                         ntohs(cm_id->remote_addr.sin_port),
2918                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2919                         ntohs(cm_id->local_addr.sin_port),
2920                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2921                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2922                         conn_param->private_data_len +
2923                         sizeof(struct ietf_mpa_frame));
2924
2925
2926         /* notify OF layer that accept event was successful */
2927         cm_id->add_ref(cm_id);
2928         nes_add_ref(&nesqp->ibqp);
2929
2930         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2931         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2932         cm_event.provider_data = (void *)nesqp;
2933         cm_event.local_addr = cm_id->local_addr;
2934         cm_event.remote_addr = cm_id->remote_addr;
2935         cm_event.private_data = NULL;
2936         cm_event.private_data_len = 0;
2937         ret = cm_id->event_handler(cm_id, &cm_event);
2938         attr.qp_state = IB_QPS_RTS;
2939         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2940         if (cm_node->loopbackpartner) {
2941                 cm_node->loopbackpartner->mpa_frame_size =
2942                         nesqp->private_data_len;
2943                 /* copy entire MPA frame to our cm_node's frame */
2944                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2945                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2946                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2947         }
2948         if (ret)
2949                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2950                         "ret=%d\n", __func__, __LINE__, ret);
2951
2952         passive_state = atomic_add_return(1, &cm_node->passive_state);
2953         if (passive_state == NES_SEND_RESET_EVENT)
2954                 create_event(cm_node, NES_CM_EVENT_RESET);
2955         return 0;
2956 }
2957
2958
2959 /**
2960  * nes_reject
2961  */
2962 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2963 {
2964         struct nes_cm_node *cm_node;
2965         struct nes_cm_node *loopback;
2966
2967         struct nes_cm_core *cm_core;
2968
2969         atomic_inc(&cm_rejects);
2970         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2971         loopback = cm_node->loopbackpartner;
2972         cm_core = cm_node->cm_core;
2973         cm_node->cm_id = cm_id;
2974         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2975
2976         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
2977                 return -EINVAL;
2978
2979         memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2980         if (loopback) {
2981                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
2982                 loopback->mpa_frame.priv_data_len = pdata_len;
2983                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
2984                                 pdata_len;
2985         } else {
2986                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2987                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2988         }
2989
2990         cm_node->mpa_frame.rev = mpa_version;
2991         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2992
2993         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2994 }
2995
2996
2997 /**
2998  * nes_connect
2999  * setup and launch cm connect node
3000  */
3001 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3002 {
3003         struct ib_qp *ibqp;
3004         struct nes_qp *nesqp;
3005         struct nes_vnic *nesvnic;
3006         struct nes_device *nesdev;
3007         struct nes_cm_node *cm_node;
3008         struct nes_cm_info cm_info;
3009         int apbvt_set = 0;
3010
3011         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3012         if (!ibqp)
3013                 return -EINVAL;
3014         nesqp = to_nesqp(ibqp);
3015         if (!nesqp)
3016                 return -EINVAL;
3017         nesvnic = to_nesvnic(nesqp->ibqp.device);
3018         if (!nesvnic)
3019                 return -EINVAL;
3020         nesdev  = nesvnic->nesdev;
3021         if (!nesdev)
3022                 return -EINVAL;
3023
3024         if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3025                 return -EINVAL;
3026
3027         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3028                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3029                 ntohl(nesvnic->local_ipaddr),
3030                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3031                 ntohs(cm_id->remote_addr.sin_port),
3032                 ntohl(cm_id->local_addr.sin_addr.s_addr),
3033                 ntohs(cm_id->local_addr.sin_port));
3034
3035         atomic_inc(&cm_connects);
3036         nesqp->active_conn = 1;
3037
3038         /* cache the cm_id in the qp */
3039         nesqp->cm_id = cm_id;
3040
3041         cm_id->provider_data = nesqp;
3042
3043         nesqp->private_data_len = conn_param->private_data_len;
3044         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3045         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3046         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3047                 conn_param->private_data_len);
3048
3049         if (cm_id->local_addr.sin_addr.s_addr !=
3050                 cm_id->remote_addr.sin_addr.s_addr) {
3051                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3052                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3053                 apbvt_set = 1;
3054         }
3055
3056         /* set up the connection params for the node */
3057         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3058         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3059         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3060         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3061         cm_info.cm_id = cm_id;
3062         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3063
3064         cm_id->add_ref(cm_id);
3065
3066         /* create a connect CM node connection */
3067         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3068                 conn_param->private_data_len, (void *)conn_param->private_data,
3069                 &cm_info);
3070         if (!cm_node) {
3071                 if (apbvt_set)
3072                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3073                                 PCI_FUNC(nesdev->pcidev->devfn),
3074                                 NES_MANAGE_APBVT_DEL);
3075
3076                 cm_id->rem_ref(cm_id);
3077                 return -ENOMEM;
3078         }
3079
3080         cm_node->apbvt_set = apbvt_set;
3081         nesqp->cm_node = cm_node;
3082         cm_node->nesqp = nesqp;
3083         nes_add_ref(&nesqp->ibqp);
3084
3085         return 0;
3086 }
3087
3088
3089 /**
3090  * nes_create_listen
3091  */
3092 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3093 {
3094         struct nes_vnic *nesvnic;
3095         struct nes_cm_listener *cm_node;
3096         struct nes_cm_info cm_info;
3097         struct nes_adapter *adapter;
3098         int err;
3099
3100
3101         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3102                         cm_id, ntohs(cm_id->local_addr.sin_port));
3103
3104         nesvnic = to_nesvnic(cm_id->device);
3105         if (!nesvnic)
3106                 return -EINVAL;
3107         adapter = nesvnic->nesdev->nesadapter;
3108         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3109                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3110
3111         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3112                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3113
3114         /* setup listen params in our api call struct */
3115         cm_info.loc_addr = nesvnic->local_ipaddr;
3116         cm_info.loc_port = cm_id->local_addr.sin_port;
3117         cm_info.backlog = backlog;
3118         cm_info.cm_id = cm_id;
3119
3120         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3121
3122
3123         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3124         if (!cm_node) {
3125                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3126                                 __func__, __LINE__);
3127                 return -ENOMEM;
3128         }
3129
3130         cm_id->provider_data = cm_node;
3131
3132         if (!cm_node->reused_node) {
3133                 err = nes_manage_apbvt(nesvnic,
3134                         ntohs(cm_id->local_addr.sin_port),
3135                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3136                         NES_MANAGE_APBVT_ADD);
3137                 if (err) {
3138                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3139                                 err);
3140                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3141                         return err;
3142                 }
3143                 cm_listens_created++;
3144         }
3145
3146         cm_id->add_ref(cm_id);
3147         cm_id->provider_data = (void *)cm_node;
3148
3149
3150         return 0;
3151 }
3152
3153
3154 /**
3155  * nes_destroy_listen
3156  */
3157 int nes_destroy_listen(struct iw_cm_id *cm_id)
3158 {
3159         if (cm_id->provider_data)
3160                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3161         else
3162                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3163
3164         cm_id->rem_ref(cm_id);
3165
3166         return 0;
3167 }
3168
3169
3170 /**
3171  * nes_cm_recv
3172  */
3173 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3174 {
3175         int rc = 0;
3176         cm_packets_received++;
3177         if ((g_cm_core) && (g_cm_core->api)) {
3178                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3179         } else {
3180                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3181                                 " cm is not setup properly.\n");
3182         }
3183
3184         return rc;
3185 }
3186
3187
3188 /**
3189  * nes_cm_start
3190  * Start and init a cm core module
3191  */
3192 int nes_cm_start(void)
3193 {
3194         nes_debug(NES_DBG_CM, "\n");
3195         /* create the primary CM core, pass this handle to subsequent core inits */
3196         g_cm_core = nes_cm_alloc_core();
3197         if (g_cm_core) {
3198                 return 0;
3199         } else {
3200                 return -ENOMEM;
3201         }
3202 }
3203
3204
3205 /**
3206  * nes_cm_stop
3207  * stop and dealloc all cm core instances
3208  */
3209 int nes_cm_stop(void)
3210 {
3211         g_cm_core->api->destroy_cm_core(g_cm_core);
3212         return 0;
3213 }
3214
3215
3216 /**
3217  * cm_event_connected
3218  * handle a connected event, setup QPs and HW
3219  */
3220 static void cm_event_connected(struct nes_cm_event *event)
3221 {
3222         u64 u64temp;
3223         struct nes_qp *nesqp;
3224         struct nes_vnic *nesvnic;
3225         struct nes_device *nesdev;
3226         struct nes_cm_node *cm_node;
3227         struct nes_adapter *nesadapter;
3228         struct ib_qp_attr attr;
3229         struct iw_cm_id *cm_id;
3230         struct iw_cm_event cm_event;
3231         struct nes_hw_qp_wqe *wqe;
3232         struct nes_v4_quad nes_quad;
3233         u32 crc_value;
3234         int ret;
3235
3236         /* get all our handles */
3237         cm_node = event->cm_node;
3238         cm_id = cm_node->cm_id;
3239         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3240         nesqp = (struct nes_qp *)cm_id->provider_data;
3241         nesvnic = to_nesvnic(nesqp->ibqp.device);
3242         nesdev = nesvnic->nesdev;
3243         nesadapter = nesdev->nesadapter;
3244
3245         if (nesqp->destroyed) {
3246                 return;
3247         }
3248         atomic_inc(&cm_connecteds);
3249         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3250                         " local port 0x%04X. jiffies = %lu.\n",
3251                         nesqp->hwqp.qp_id,
3252                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3253                         ntohs(cm_id->remote_addr.sin_port),
3254                         ntohs(cm_id->local_addr.sin_port),
3255                         jiffies);
3256
3257         nes_cm_init_tsa_conn(nesqp, cm_node);
3258
3259         /* set the QP tsa context */
3260         nesqp->nesqp_context->tcpPorts[0] =
3261                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3262         nesqp->nesqp_context->tcpPorts[1] =
3263                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3264         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3265                 nesqp->nesqp_context->ip0 =
3266                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3267         else
3268                 nesqp->nesqp_context->ip0 =
3269                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3270
3271         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3272                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3273                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3274         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3275                         nes_arp_table(nesdev,
3276                         le32_to_cpu(nesqp->nesqp_context->ip0),
3277                         NULL, NES_ARP_RESOLVE) << 16);
3278         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3279                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3280         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3281         nesqp->nesqp_context->ird_ord_sizes |=
3282                         cpu_to_le32((u32)1 <<
3283                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3284
3285         /* Adjust tail for not having a LSMM */
3286         nesqp->hwqp.sq_tail = 1;
3287
3288 #if defined(NES_SEND_FIRST_WRITE)
3289         if (cm_node->send_write0) {
3290                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3291                 wqe = &nesqp->hwqp.sq_vbase[0];
3292                 u64temp = (unsigned long)nesqp;
3293                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3294                 set_wqe_64bit_value(wqe->wqe_words,
3295                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3296                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3297                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3298                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3299                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3300                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3301                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3302                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3303
3304                 /* use the reserved spot on the WQ for the extra first WQE */
3305                 nesqp->nesqp_context->ird_ord_sizes &=
3306                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3307                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3308                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3309                 nesqp->skip_lsmm = 1;
3310                 nesqp->hwqp.sq_tail = 0;
3311                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3312                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3313         }
3314 #endif
3315
3316         memset(&nes_quad, 0, sizeof(nes_quad));
3317
3318         nes_quad.DstIpAdrIndex =
3319                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3320         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3321                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3322         else
3323                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3324         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3325         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3326
3327         /* Produce hash key */
3328         crc_value = get_crc_value(&nes_quad);
3329         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3330         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3331                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3332
3333         nesqp->hte_index &= nesadapter->hte_index_mask;
3334         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3335
3336         nesqp->ietf_frame = &cm_node->mpa_frame;
3337         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3338         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3339
3340         /* notify OF layer we successfully created the requested connection */
3341         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3342         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3343         cm_event.provider_data = cm_id->provider_data;
3344         cm_event.local_addr.sin_family = AF_INET;
3345         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3346         cm_event.remote_addr = cm_id->remote_addr;
3347
3348         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3349         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3350
3351         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3352         ret = cm_id->event_handler(cm_id, &cm_event);
3353         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3354
3355         if (ret)
3356                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3357                         "ret=%d\n", __func__, __LINE__, ret);
3358         attr.qp_state = IB_QPS_RTS;
3359         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3360
3361         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3362                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3363
3364         return;
3365 }
3366
3367
3368 /**
3369  * cm_event_connect_error
3370  */
3371 static void cm_event_connect_error(struct nes_cm_event *event)
3372 {
3373         struct nes_qp *nesqp;
3374         struct iw_cm_id *cm_id;
3375         struct iw_cm_event cm_event;
3376         /* struct nes_cm_info cm_info; */
3377         int ret;
3378
3379         if (!event->cm_node)
3380                 return;
3381
3382         cm_id = event->cm_node->cm_id;
3383         if (!cm_id) {
3384                 return;
3385         }
3386
3387         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3388         nesqp = cm_id->provider_data;
3389
3390         if (!nesqp) {
3391                 return;
3392         }
3393
3394         /* notify OF layer about this connection error event */
3395         /* cm_id->rem_ref(cm_id); */
3396         nesqp->cm_id = NULL;
3397         cm_id->provider_data = NULL;
3398         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3399         cm_event.status = -ECONNRESET;
3400         cm_event.provider_data = cm_id->provider_data;
3401         cm_event.local_addr = cm_id->local_addr;
3402         cm_event.remote_addr = cm_id->remote_addr;
3403         cm_event.private_data = NULL;
3404         cm_event.private_data_len = 0;
3405
3406         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3407                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3408                 cm_event.remote_addr.sin_addr.s_addr);
3409
3410         ret = cm_id->event_handler(cm_id, &cm_event);
3411         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3412         if (ret)
3413                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3414                         "ret=%d\n", __func__, __LINE__, ret);
3415         cm_id->rem_ref(cm_id);
3416
3417         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3418         return;
3419 }
3420
3421
3422 /**
3423  * cm_event_reset
3424  */
3425 static void cm_event_reset(struct nes_cm_event *event)
3426 {
3427         struct nes_qp *nesqp;
3428         struct iw_cm_id *cm_id;
3429         struct iw_cm_event cm_event;
3430         /* struct nes_cm_info cm_info; */
3431         int ret;
3432
3433         if (!event->cm_node)
3434                 return;
3435
3436         if (!event->cm_node->cm_id)
3437                 return;
3438
3439         cm_id = event->cm_node->cm_id;
3440
3441         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3442         nesqp = cm_id->provider_data;
3443
3444         nesqp->cm_id = NULL;
3445         /* cm_id->provider_data = NULL; */
3446         cm_event.event = IW_CM_EVENT_DISCONNECT;
3447         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3448         cm_event.provider_data = cm_id->provider_data;
3449         cm_event.local_addr = cm_id->local_addr;
3450         cm_event.remote_addr = cm_id->remote_addr;
3451         cm_event.private_data = NULL;
3452         cm_event.private_data_len = 0;
3453
3454         ret = cm_id->event_handler(cm_id, &cm_event);
3455         cm_id->add_ref(cm_id);
3456         atomic_inc(&cm_closes);
3457         cm_event.event = IW_CM_EVENT_CLOSE;
3458         cm_event.status = IW_CM_EVENT_STATUS_OK;
3459         cm_event.provider_data = cm_id->provider_data;
3460         cm_event.local_addr = cm_id->local_addr;
3461         cm_event.remote_addr = cm_id->remote_addr;
3462         cm_event.private_data = NULL;
3463         cm_event.private_data_len = 0;
3464         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3465         ret = cm_id->event_handler(cm_id, &cm_event);
3466
3467         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3468
3469
3470         /* notify OF layer about this connection error event */
3471         cm_id->rem_ref(cm_id);
3472
3473         return;
3474 }
3475
3476
3477 /**
3478  * cm_event_mpa_req
3479  */
3480 static void cm_event_mpa_req(struct nes_cm_event *event)
3481 {
3482         struct iw_cm_id   *cm_id;
3483         struct iw_cm_event cm_event;
3484         int ret;
3485         struct nes_cm_node *cm_node;
3486
3487         cm_node = event->cm_node;
3488         if (!cm_node)
3489                 return;
3490         cm_id = cm_node->cm_id;
3491
3492         atomic_inc(&cm_connect_reqs);
3493         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3494                         cm_node, cm_id, jiffies);
3495
3496         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3497         cm_event.status = IW_CM_EVENT_STATUS_OK;
3498         cm_event.provider_data = (void *)cm_node;
3499
3500         cm_event.local_addr.sin_family = AF_INET;
3501         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3502         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3503
3504         cm_event.remote_addr.sin_family = AF_INET;
3505         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3506         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3507         cm_event.private_data = cm_node->mpa_frame_buf;
3508         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3509
3510         ret = cm_id->event_handler(cm_id, &cm_event);
3511         if (ret)
3512                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3513                                 __func__, __LINE__, ret);
3514         return;
3515 }
3516
3517
3518 static void cm_event_mpa_reject(struct nes_cm_event *event)
3519 {
3520         struct iw_cm_id   *cm_id;
3521         struct iw_cm_event cm_event;
3522         struct nes_cm_node *cm_node;
3523         int ret;
3524
3525         cm_node = event->cm_node;
3526         if (!cm_node)
3527                 return;
3528         cm_id = cm_node->cm_id;
3529
3530         atomic_inc(&cm_connect_reqs);
3531         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3532                         cm_node, cm_id, jiffies);
3533
3534         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3535         cm_event.status = -ECONNREFUSED;
3536         cm_event.provider_data = cm_id->provider_data;
3537
3538         cm_event.local_addr.sin_family = AF_INET;
3539         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3540         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3541
3542         cm_event.remote_addr.sin_family = AF_INET;
3543         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3544         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3545
3546         cm_event.private_data = cm_node->mpa_frame_buf;
3547         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3548
3549         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3550                         "remove_addr=%08x\n",
3551                         cm_event.local_addr.sin_addr.s_addr,
3552                         cm_event.remote_addr.sin_addr.s_addr);
3553
3554         ret = cm_id->event_handler(cm_id, &cm_event);
3555         if (ret)
3556                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3557                                 __func__, __LINE__, ret);
3558
3559         return;
3560 }
3561
3562
3563 static void nes_cm_event_handler(struct work_struct *);
3564
3565 /**
3566  * nes_cm_post_event
3567  * post an event to the cm event handler
3568  */
3569 static int nes_cm_post_event(struct nes_cm_event *event)
3570 {
3571         atomic_inc(&event->cm_node->cm_core->events_posted);
3572         add_ref_cm_node(event->cm_node);
3573         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3574         INIT_WORK(&event->event_work, nes_cm_event_handler);
3575         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3576                 event->cm_node, event);
3577
3578         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3579
3580         nes_debug(NES_DBG_CM, "Exit\n");
3581         return 0;
3582 }
3583
3584
3585 /**
3586  * nes_cm_event_handler
3587  * worker function to handle cm events
3588  * will free instance of nes_cm_event
3589  */
3590 static void nes_cm_event_handler(struct work_struct *work)
3591 {
3592         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3593                         event_work);
3594         struct nes_cm_core *cm_core;
3595
3596         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3597                 return;
3598
3599         cm_core = event->cm_node->cm_core;
3600         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3601                 event, event->type, atomic_read(&cm_core->events_posted));
3602
3603         switch (event->type) {
3604         case NES_CM_EVENT_MPA_REQ:
3605                 cm_event_mpa_req(event);
3606                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3607                         event->cm_node);
3608                 break;
3609         case NES_CM_EVENT_RESET:
3610                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3611                         event->cm_node);
3612                 cm_event_reset(event);
3613                 break;
3614         case NES_CM_EVENT_CONNECTED:
3615                 if ((!event->cm_node->cm_id) ||
3616                         (event->cm_node->state != NES_CM_STATE_TSA))
3617                         break;
3618                 cm_event_connected(event);
3619                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3620                 break;
3621         case NES_CM_EVENT_MPA_REJECT:
3622                 if ((!event->cm_node->cm_id) ||
3623                                 (event->cm_node->state == NES_CM_STATE_TSA))
3624                         break;
3625                 cm_event_mpa_reject(event);
3626                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3627                 break;
3628
3629         case NES_CM_EVENT_ABORTED:
3630                 if ((!event->cm_node->cm_id) ||
3631                         (event->cm_node->state == NES_CM_STATE_TSA))
3632                         break;
3633                 cm_event_connect_error(event);
3634                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3635                 break;
3636         case NES_CM_EVENT_DROPPED_PKT:
3637                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3638                 break;
3639         default:
3640                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3641                 break;
3642         }
3643
3644         atomic_dec(&cm_core->events_posted);
3645         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3646         rem_ref_cm_node(cm_core, event->cm_node);
3647         kfree(event);
3648
3649         return;
3650 }