RDMA/nes: Handle MPA Reject message properly
[linux-2.6.git] / drivers / infiniband / hw / nes / nes_cm.c
1 /*
2  * Copyright (c) 2006 - 2009 Intel-NE, Inc.  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
60 #include "nes.h"
61
62 u32 cm_packets_sent;
63 u32 cm_packets_bounced;
64 u32 cm_packets_dropped;
65 u32 cm_packets_retrans;
66 u32 cm_packets_created;
67 u32 cm_packets_received;
68 u32 cm_listens_created;
69 u32 cm_listens_destroyed;
70 u32 cm_backlog_drops;
71 atomic_t cm_loopbacks;
72 atomic_t cm_nodes_created;
73 atomic_t cm_nodes_destroyed;
74 atomic_t cm_accel_dropped_pkts;
75 atomic_t cm_resets_recvd;
76
77 static inline int mini_cm_accelerated(struct nes_cm_core *,
78         struct nes_cm_node *);
79 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *,
80         struct nes_vnic *, struct nes_cm_info *);
81 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
82 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *,
83         struct nes_vnic *, u16, void *, struct nes_cm_info *);
84 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
85 static int mini_cm_accept(struct nes_cm_core *, struct ietf_mpa_frame *,
86         struct nes_cm_node *);
87 static int mini_cm_reject(struct nes_cm_core *, struct ietf_mpa_frame *,
88         struct nes_cm_node *);
89 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *,
90         struct sk_buff *);
91 static int mini_cm_dealloc_core(struct nes_cm_core *);
92 static int mini_cm_get(struct nes_cm_core *);
93 static int mini_cm_set(struct nes_cm_core *, u32, u32);
94
95 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *,
96         void *, u32, void *, u32, u8);
97 static int add_ref_cm_node(struct nes_cm_node *);
98 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
99
100 static int nes_cm_disconn_true(struct nes_qp *);
101 static int nes_cm_post_event(struct nes_cm_event *event);
102 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
103 static void nes_disconnect_worker(struct work_struct *work);
104
105 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
106 static int send_mpa_reject(struct nes_cm_node *);
107 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
108 static int send_reset(struct nes_cm_node *, struct sk_buff *);
109 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
110 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
111 static void process_packet(struct nes_cm_node *, struct sk_buff *,
112         struct nes_cm_core *);
113
114 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
115 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
116 static void cleanup_retrans_entry(struct nes_cm_node *);
117 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
118 static void free_retrans_entry(struct nes_cm_node *cm_node);
119 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
120         struct sk_buff *skb, int optionsize, int passive);
121
122 /* CM event handler functions */
123 static void cm_event_connected(struct nes_cm_event *);
124 static void cm_event_connect_error(struct nes_cm_event *);
125 static void cm_event_reset(struct nes_cm_event *);
126 static void cm_event_mpa_req(struct nes_cm_event *);
127 static void cm_event_mpa_reject(struct nes_cm_event *);
128 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
129
130 static void print_core(struct nes_cm_core *core);
131
132 /* External CM API Interface */
133 /* instance of function pointers for client API */
134 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
135 static struct nes_cm_ops nes_cm_api = {
136         mini_cm_accelerated,
137         mini_cm_listen,
138         mini_cm_del_listen,
139         mini_cm_connect,
140         mini_cm_close,
141         mini_cm_accept,
142         mini_cm_reject,
143         mini_cm_recv_pkt,
144         mini_cm_dealloc_core,
145         mini_cm_get,
146         mini_cm_set
147 };
148
149 static struct nes_cm_core *g_cm_core;
150
151 atomic_t cm_connects;
152 atomic_t cm_accepts;
153 atomic_t cm_disconnects;
154 atomic_t cm_closes;
155 atomic_t cm_connecteds;
156 atomic_t cm_connect_reqs;
157 atomic_t cm_rejects;
158
159
160 /**
161  * create_event
162  */
163 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
164                 enum nes_cm_event_type type)
165 {
166         struct nes_cm_event *event;
167
168         if (!cm_node->cm_id)
169                 return NULL;
170
171         /* allocate an empty event */
172         event = kzalloc(sizeof(*event), GFP_ATOMIC);
173
174         if (!event)
175                 return NULL;
176
177         event->type = type;
178         event->cm_node = cm_node;
179         event->cm_info.rem_addr = cm_node->rem_addr;
180         event->cm_info.loc_addr = cm_node->loc_addr;
181         event->cm_info.rem_port = cm_node->rem_port;
182         event->cm_info.loc_port = cm_node->loc_port;
183         event->cm_info.cm_id = cm_node->cm_id;
184
185         nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
186                 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
187                 cm_node, event, type, event->cm_info.loc_addr,
188                 event->cm_info.loc_port, event->cm_info.rem_addr,
189                 event->cm_info.rem_port);
190
191         nes_cm_post_event(event);
192         return event;
193 }
194
195
196 /**
197  * send_mpa_request
198  */
199 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
200 {
201         if (!skb) {
202                 nes_debug(NES_DBG_CM, "skb set to NULL\n");
203                 return -1;
204         }
205
206         /* send an MPA Request frame */
207         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
208                         cm_node->mpa_frame_size, SET_ACK);
209
210         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
211 }
212
213
214
215 static int send_mpa_reject(struct nes_cm_node *cm_node)
216 {
217         struct sk_buff  *skb = NULL;
218
219         skb = dev_alloc_skb(MAX_CM_BUFFER);
220         if (!skb) {
221                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
222                 return -ENOMEM;
223         }
224
225         /* send an MPA reject frame */
226         form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
227                         cm_node->mpa_frame_size, SET_ACK | SET_FIN);
228
229         cm_node->state = NES_CM_STATE_FIN_WAIT1;
230         return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
231 }
232
233
234 /**
235  * recv_mpa - process a received TCP pkt, we are expecting an
236  * IETF MPA frame
237  */
238 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
239                 u32 len)
240 {
241         struct ietf_mpa_frame *mpa_frame;
242
243         *type = NES_MPA_REQUEST_ACCEPT;
244
245         /* assume req frame is in tcp data payload */
246         if (len < sizeof(struct ietf_mpa_frame)) {
247                 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
248                 return -EINVAL;
249         }
250
251         mpa_frame = (struct ietf_mpa_frame *)buffer;
252         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
253
254         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
255                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
256                                 " complete (%x + %x != %x)\n",
257                                 cm_node->mpa_frame_size,
258                                 (u32)sizeof(struct ietf_mpa_frame), len);
259                 return -EINVAL;
260         }
261         /* make sure it does not exceed the max size */
262         if (len > MAX_CM_BUFFER) {
263                 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
264                                 " (%x + %x != %x)\n",
265                                 cm_node->mpa_frame_size,
266                                 (u32)sizeof(struct ietf_mpa_frame), len);
267                 return -EINVAL;
268         }
269
270         /* copy entire MPA frame to our cm_node's frame */
271         memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
272                         cm_node->mpa_frame_size);
273
274         if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
275                 *type = NES_MPA_REQUEST_REJECT;
276         return 0;
277 }
278
279
280 /**
281  * form_cm_frame - get a free packet and build empty frame Use
282  * node info to build.
283  */
284 static void form_cm_frame(struct sk_buff *skb,
285         struct nes_cm_node *cm_node, void *options, u32 optionsize,
286         void *data, u32 datasize, u8 flags)
287 {
288         struct tcphdr *tcph;
289         struct iphdr *iph;
290         struct ethhdr *ethh;
291         u8 *buf;
292         u16 packetsize = sizeof(*iph);
293
294         packetsize += sizeof(*tcph);
295         packetsize +=  optionsize + datasize;
296
297         memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
298
299         skb->len = 0;
300         buf = skb_put(skb, packetsize + ETH_HLEN);
301
302         ethh = (struct ethhdr *) buf;
303         buf += ETH_HLEN;
304
305         iph = (struct iphdr *)buf;
306         buf += sizeof(*iph);
307         tcph = (struct tcphdr *)buf;
308         skb_reset_mac_header(skb);
309         skb_set_network_header(skb, ETH_HLEN);
310         skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
311         buf += sizeof(*tcph);
312
313         skb->ip_summed = CHECKSUM_PARTIAL;
314         skb->protocol = htons(0x800);
315         skb->data_len = 0;
316         skb->mac_len = ETH_HLEN;
317
318         memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
319         memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
320         ethh->h_proto = htons(0x0800);
321
322         iph->version = IPVERSION;
323         iph->ihl = 5;           /* 5 * 4Byte words, IP headr len */
324         iph->tos = 0;
325         iph->tot_len = htons(packetsize);
326         iph->id = htons(++cm_node->tcp_cntxt.loc_id);
327
328         iph->frag_off = htons(0x4000);
329         iph->ttl = 0x40;
330         iph->protocol = 0x06;   /* IPPROTO_TCP */
331
332         iph->saddr = htonl(cm_node->loc_addr);
333         iph->daddr = htonl(cm_node->rem_addr);
334
335         tcph->source = htons(cm_node->loc_port);
336         tcph->dest = htons(cm_node->rem_port);
337         tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
338
339         if (flags & SET_ACK) {
340                 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
341                 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
342                 tcph->ack = 1;
343         } else
344                 tcph->ack_seq = 0;
345
346         if (flags & SET_SYN) {
347                 cm_node->tcp_cntxt.loc_seq_num++;
348                 tcph->syn = 1;
349         } else
350                 cm_node->tcp_cntxt.loc_seq_num += datasize;
351
352         if (flags & SET_FIN) {
353                 cm_node->tcp_cntxt.loc_seq_num++;
354                 tcph->fin = 1;
355         }
356
357         if (flags & SET_RST)
358                 tcph->rst = 1;
359
360         tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
361         tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
362         tcph->urg_ptr = 0;
363         if (optionsize)
364                 memcpy(buf, options, optionsize);
365         buf += optionsize;
366         if (datasize)
367                 memcpy(buf, data, datasize);
368
369         skb_shinfo(skb)->nr_frags = 0;
370         cm_packets_created++;
371
372 }
373
374
375 /**
376  * print_core - dump a cm core
377  */
378 static void print_core(struct nes_cm_core *core)
379 {
380         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
381         nes_debug(NES_DBG_CM, "CM Core  -- (core = %p )\n", core);
382         if (!core)
383                 return;
384         nes_debug(NES_DBG_CM, "---------------------------------------------\n");
385
386         nes_debug(NES_DBG_CM, "State         : %u \n",  core->state);
387
388         nes_debug(NES_DBG_CM, "Listen Nodes  : %u \n", atomic_read(&core->listen_node_cnt));
389         nes_debug(NES_DBG_CM, "Active Nodes  : %u \n", atomic_read(&core->node_cnt));
390
391         nes_debug(NES_DBG_CM, "core          : %p \n", core);
392
393         nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
394 }
395
396
397 /**
398  * schedule_nes_timer
399  * note - cm_node needs to be protected before calling this. Encase in:
400  *                      rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
401  */
402 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
403                 enum nes_timer_type type, int send_retrans,
404                 int close_when_complete)
405 {
406         unsigned long  flags;
407         struct nes_cm_core *cm_core = cm_node->cm_core;
408         struct nes_timer_entry *new_send;
409         int ret = 0;
410         u32 was_timer_set;
411
412         new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
413         if (!new_send)
414                 return -ENOMEM;
415
416         /* new_send->timetosend = currenttime */
417         new_send->retrycount = NES_DEFAULT_RETRYS;
418         new_send->retranscount = NES_DEFAULT_RETRANS;
419         new_send->skb = skb;
420         new_send->timetosend = jiffies;
421         new_send->type = type;
422         new_send->netdev = cm_node->netdev;
423         new_send->send_retrans = send_retrans;
424         new_send->close_when_complete = close_when_complete;
425
426         if (type == NES_TIMER_TYPE_CLOSE) {
427                 new_send->timetosend += (HZ/10);
428                 if (cm_node->recv_entry) {
429                         WARN_ON(1);
430                         return -EINVAL;
431                 }
432                 cm_node->recv_entry = new_send;
433         }
434
435         if (type == NES_TIMER_TYPE_SEND) {
436                 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
437                 atomic_inc(&new_send->skb->users);
438                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
439                 cm_node->send_entry = new_send;
440                 add_ref_cm_node(cm_node);
441                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
442                 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
443
444                 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
445                 if (ret != NETDEV_TX_OK) {
446                         nes_debug(NES_DBG_CM, "Error sending packet %p "
447                                 "(jiffies = %lu)\n", new_send, jiffies);
448                         atomic_dec(&new_send->skb->users);
449                         new_send->timetosend = jiffies;
450                 } else {
451                         cm_packets_sent++;
452                         if (!send_retrans) {
453                                 cleanup_retrans_entry(cm_node);
454                                 if (close_when_complete)
455                                         rem_ref_cm_node(cm_core, cm_node);
456                                 return ret;
457                         }
458                 }
459         }
460
461         was_timer_set = timer_pending(&cm_core->tcp_timer);
462
463         if (!was_timer_set) {
464                 cm_core->tcp_timer.expires = new_send->timetosend;
465                 add_timer(&cm_core->tcp_timer);
466         }
467
468         return ret;
469 }
470
471 static void nes_retrans_expired(struct nes_cm_node *cm_node)
472 {
473         switch (cm_node->state) {
474         case NES_CM_STATE_SYN_RCVD:
475         case NES_CM_STATE_CLOSING:
476                 rem_ref_cm_node(cm_node->cm_core, cm_node);
477                 break;
478         case NES_CM_STATE_LAST_ACK:
479         case NES_CM_STATE_FIN_WAIT1:
480         case NES_CM_STATE_MPAREJ_RCVD:
481                 send_reset(cm_node, NULL);
482                 break;
483         default:
484                 create_event(cm_node, NES_CM_EVENT_ABORTED);
485         }
486 }
487
488 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
489 {
490         struct nes_timer_entry *recv_entry = cm_node->recv_entry;
491         struct iw_cm_id *cm_id = cm_node->cm_id;
492         struct nes_qp *nesqp;
493         unsigned long qplockflags;
494
495         if (!recv_entry)
496                 return;
497         nesqp = (struct nes_qp *)recv_entry->skb;
498         if (nesqp) {
499                 spin_lock_irqsave(&nesqp->lock, qplockflags);
500                 if (nesqp->cm_id) {
501                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
502                                 "refcount = %d: HIT A "
503                                 "NES_TIMER_TYPE_CLOSE with something "
504                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
505                                 atomic_read(&nesqp->refcount));
506                         nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
507                         nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
508                         nesqp->ibqp_state = IB_QPS_ERR;
509                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
510                         nes_cm_disconn(nesqp);
511                 } else {
512                         spin_unlock_irqrestore(&nesqp->lock, qplockflags);
513                         nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
514                                 "refcount = %d: HIT A "
515                                 "NES_TIMER_TYPE_CLOSE with nothing "
516                                 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
517                                 atomic_read(&nesqp->refcount));
518                 }
519         } else if (rem_node) {
520                 /* TIME_WAIT state */
521                 rem_ref_cm_node(cm_node->cm_core, cm_node);
522         }
523         if (cm_node->cm_id)
524                 cm_id->rem_ref(cm_id);
525         kfree(recv_entry);
526         cm_node->recv_entry = NULL;
527 }
528
529 /**
530  * nes_cm_timer_tick
531  */
532 static void nes_cm_timer_tick(unsigned long pass)
533 {
534         unsigned long flags;
535         unsigned long nexttimeout = jiffies + NES_LONG_TIME;
536         struct nes_cm_node *cm_node;
537         struct nes_timer_entry *send_entry, *recv_entry;
538         struct list_head *list_core_temp;
539         struct list_head *list_node;
540         struct nes_cm_core *cm_core = g_cm_core;
541         u32 settimer = 0;
542         int ret = NETDEV_TX_OK;
543
544         struct list_head timer_list;
545         INIT_LIST_HEAD(&timer_list);
546         spin_lock_irqsave(&cm_core->ht_lock, flags);
547
548         list_for_each_safe(list_node, list_core_temp,
549                                 &cm_core->connected_nodes) {
550                 cm_node = container_of(list_node, struct nes_cm_node, list);
551                 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
552                         add_ref_cm_node(cm_node);
553                         list_add(&cm_node->timer_entry, &timer_list);
554                 }
555         }
556         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
557
558         list_for_each_safe(list_node, list_core_temp, &timer_list) {
559                 cm_node = container_of(list_node, struct nes_cm_node,
560                                         timer_entry);
561                 recv_entry = cm_node->recv_entry;
562
563                 if (recv_entry) {
564                         if (time_after(recv_entry->timetosend, jiffies)) {
565                                 if (nexttimeout > recv_entry->timetosend ||
566                                                 !settimer) {
567                                         nexttimeout = recv_entry->timetosend;
568                                         settimer = 1;
569                                 }
570                         } else
571                                 handle_recv_entry(cm_node, 1);
572                 }
573
574                 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
575                 do {
576                         send_entry = cm_node->send_entry;
577                         if (!send_entry)
578                                 break;
579                         if (time_after(send_entry->timetosend, jiffies)) {
580                                 if (cm_node->state != NES_CM_STATE_TSA) {
581                                         if ((nexttimeout >
582                                                 send_entry->timetosend) ||
583                                                 !settimer) {
584                                                 nexttimeout =
585                                                         send_entry->timetosend;
586                                                 settimer = 1;
587                                         }
588                                 } else {
589                                         free_retrans_entry(cm_node);
590                                 }
591                                 break;
592                         }
593
594                         if ((cm_node->state == NES_CM_STATE_TSA) ||
595                                 (cm_node->state == NES_CM_STATE_CLOSED)) {
596                                 free_retrans_entry(cm_node);
597                                 break;
598                         }
599
600                         if (!send_entry->retranscount ||
601                                 !send_entry->retrycount) {
602                                 cm_packets_dropped++;
603                                 free_retrans_entry(cm_node);
604
605                                 spin_unlock_irqrestore(
606                                         &cm_node->retrans_list_lock, flags);
607                                 nes_retrans_expired(cm_node);
608                                 cm_node->state = NES_CM_STATE_CLOSED;
609                                 spin_lock_irqsave(&cm_node->retrans_list_lock,
610                                         flags);
611                                 break;
612                         }
613                         atomic_inc(&send_entry->skb->users);
614                         cm_packets_retrans++;
615                         nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
616                                 "for node %p, jiffies = %lu, time to send = "
617                                 "%lu, retranscount = %u, send_entry->seq_num = "
618                                 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
619                                 "0x%08X\n", send_entry, cm_node, jiffies,
620                                 send_entry->timetosend,
621                                 send_entry->retranscount,
622                                 send_entry->seq_num,
623                                 cm_node->tcp_cntxt.rem_ack_num);
624
625                         spin_unlock_irqrestore(&cm_node->retrans_list_lock,
626                                 flags);
627                         ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
628                         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
629                         if (ret != NETDEV_TX_OK) {
630                                 nes_debug(NES_DBG_CM, "rexmit failed for "
631                                         "node=%p\n", cm_node);
632                                 cm_packets_bounced++;
633                                 atomic_dec(&send_entry->skb->users);
634                                 send_entry->retrycount--;
635                                 nexttimeout = jiffies + NES_SHORT_TIME;
636                                 settimer = 1;
637                                 break;
638                         } else {
639                                 cm_packets_sent++;
640                         }
641                         nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
642                                 "%u, retry count = %u.\n",
643                                 send_entry->retranscount,
644                                 send_entry->retrycount);
645                         if (send_entry->send_retrans) {
646                                 send_entry->retranscount--;
647                                 send_entry->timetosend = jiffies +
648                                         NES_RETRY_TIMEOUT;
649                                 if (nexttimeout > send_entry->timetosend ||
650                                         !settimer) {
651                                         nexttimeout = send_entry->timetosend;
652                                         settimer = 1;
653                                 }
654                         } else {
655                                 int close_when_complete;
656                                 close_when_complete =
657                                         send_entry->close_when_complete;
658                                 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
659                                         cm_node, cm_node->state);
660                                 free_retrans_entry(cm_node);
661                                 if (close_when_complete)
662                                         rem_ref_cm_node(cm_node->cm_core,
663                                                 cm_node);
664                         }
665                 } while (0);
666
667                 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
668                 rem_ref_cm_node(cm_node->cm_core, cm_node);
669                 if (ret != NETDEV_TX_OK) {
670                         nes_debug(NES_DBG_CM, "rexmit failed for cm_node=%p\n",
671                                 cm_node);
672                         break;
673                 }
674         }
675
676         if (settimer) {
677                 if (!timer_pending(&cm_core->tcp_timer)) {
678                         cm_core->tcp_timer.expires  = nexttimeout;
679                         add_timer(&cm_core->tcp_timer);
680                 }
681         }
682 }
683
684
685 /**
686  * send_syn
687  */
688 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
689         struct sk_buff *skb)
690 {
691         int ret;
692         int flags = SET_SYN;
693         char optionsbuffer[sizeof(struct option_mss) +
694                 sizeof(struct option_windowscale) + sizeof(struct option_base) +
695                 TCP_OPTIONS_PADDING];
696
697         int optionssize = 0;
698         /* Sending MSS option */
699         union all_known_options *options;
700
701         if (!cm_node)
702                 return -EINVAL;
703
704         options = (union all_known_options *)&optionsbuffer[optionssize];
705         options->as_mss.optionnum = OPTION_NUMBER_MSS;
706         options->as_mss.length = sizeof(struct option_mss);
707         options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
708         optionssize += sizeof(struct option_mss);
709
710         options = (union all_known_options *)&optionsbuffer[optionssize];
711         options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
712         options->as_windowscale.length = sizeof(struct option_windowscale);
713         options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
714         optionssize += sizeof(struct option_windowscale);
715
716         if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
717                 options = (union all_known_options *)&optionsbuffer[optionssize];
718                 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
719                 options->as_base.length = sizeof(struct option_base);
720                 optionssize += sizeof(struct option_base);
721                 /* we need the size to be a multiple of 4 */
722                 options = (union all_known_options *)&optionsbuffer[optionssize];
723                 options->as_end = 1;
724                 optionssize += 1;
725                 options = (union all_known_options *)&optionsbuffer[optionssize];
726                 options->as_end = 1;
727                 optionssize += 1;
728         }
729
730         options = (union all_known_options *)&optionsbuffer[optionssize];
731         options->as_end = OPTION_NUMBER_END;
732         optionssize += 1;
733
734         if (!skb)
735                 skb = dev_alloc_skb(MAX_CM_BUFFER);
736         if (!skb) {
737                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
738                 return -1;
739         }
740
741         if (sendack)
742                 flags |= SET_ACK;
743
744         form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
745         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
746
747         return ret;
748 }
749
750
751 /**
752  * send_reset
753  */
754 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
755 {
756         int ret;
757         int flags = SET_RST | SET_ACK;
758
759         if (!skb)
760                 skb = dev_alloc_skb(MAX_CM_BUFFER);
761         if (!skb) {
762                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
763                 return -ENOMEM;
764         }
765
766         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
767         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
768
769         return ret;
770 }
771
772
773 /**
774  * send_ack
775  */
776 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
777 {
778         int ret;
779
780         if (!skb)
781                 skb = dev_alloc_skb(MAX_CM_BUFFER);
782
783         if (!skb) {
784                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
785                 return -1;
786         }
787
788         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
789         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
790
791         return ret;
792 }
793
794
795 /**
796  * send_fin
797  */
798 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
799 {
800         int ret;
801
802         /* if we didn't get a frame get one */
803         if (!skb)
804                 skb = dev_alloc_skb(MAX_CM_BUFFER);
805
806         if (!skb) {
807                 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
808                 return -1;
809         }
810
811         form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
812         ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
813
814         return ret;
815 }
816
817
818 /**
819  * find_node - find a cm node that matches the reference cm node
820  */
821 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
822                 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
823 {
824         unsigned long flags;
825         struct list_head *hte;
826         struct nes_cm_node *cm_node;
827
828         /* get a handle on the hte */
829         hte = &cm_core->connected_nodes;
830
831         /* walk list and find cm_node associated with this session ID */
832         spin_lock_irqsave(&cm_core->ht_lock, flags);
833         list_for_each_entry(cm_node, hte, list) {
834                 /* compare quad, return node handle if a match */
835                 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
836                                 cm_node->loc_addr, cm_node->loc_port,
837                                 loc_addr, loc_port,
838                                 cm_node->rem_addr, cm_node->rem_port,
839                                 rem_addr, rem_port);
840                 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
841                                 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
842                         add_ref_cm_node(cm_node);
843                         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
844                         return cm_node;
845                 }
846         }
847         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
848
849         /* no owner node */
850         return NULL;
851 }
852
853
854 /**
855  * find_listener - find a cm node listening on this addr-port pair
856  */
857 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
858                 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
859 {
860         unsigned long flags;
861         struct nes_cm_listener *listen_node;
862         __be32 tmp_addr = cpu_to_be32(dst_addr);
863
864         /* walk list and find cm_node associated with this session ID */
865         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
866         list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
867                 /* compare node pair, return node handle if a match */
868                 if (((listen_node->loc_addr == dst_addr) ||
869                                 listen_node->loc_addr == 0x00000000) &&
870                                 (listen_node->loc_port == dst_port) &&
871                                 (listener_state & listen_node->listener_state)) {
872                         atomic_inc(&listen_node->ref_count);
873                         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
874                         return listen_node;
875                 }
876         }
877         spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
878
879         nes_debug(NES_DBG_CM, "Unable to find listener for %pI4:%x\n",
880                   &tmp_addr, dst_port);
881
882         /* no listener */
883         return NULL;
884 }
885
886
887 /**
888  * add_hte_node - add a cm node to the hash table
889  */
890 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
891 {
892         unsigned long flags;
893         struct list_head *hte;
894
895         if (!cm_node || !cm_core)
896                 return -EINVAL;
897
898         nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
899                 cm_node);
900
901         spin_lock_irqsave(&cm_core->ht_lock, flags);
902
903         /* get a handle on the hash table element (list head for this slot) */
904         hte = &cm_core->connected_nodes;
905         list_add_tail(&cm_node->list, hte);
906         atomic_inc(&cm_core->ht_node_cnt);
907
908         spin_unlock_irqrestore(&cm_core->ht_lock, flags);
909
910         return 0;
911 }
912
913
914 /**
915  * mini_cm_dec_refcnt_listen
916  */
917 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
918         struct nes_cm_listener *listener, int free_hanging_nodes)
919 {
920         int ret = -EINVAL;
921         int err = 0;
922         unsigned long flags;
923         struct list_head *list_pos = NULL;
924         struct list_head *list_temp = NULL;
925         struct nes_cm_node *cm_node = NULL;
926         struct list_head reset_list;
927
928         nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
929                 "refcnt=%d\n", listener, free_hanging_nodes,
930                 atomic_read(&listener->ref_count));
931         /* free non-accelerated child nodes for this listener */
932         INIT_LIST_HEAD(&reset_list);
933         if (free_hanging_nodes) {
934                 spin_lock_irqsave(&cm_core->ht_lock, flags);
935                 list_for_each_safe(list_pos, list_temp,
936                                    &g_cm_core->connected_nodes) {
937                         cm_node = container_of(list_pos, struct nes_cm_node,
938                                 list);
939                         if ((cm_node->listener == listener) &&
940                             (!cm_node->accelerated)) {
941                                 add_ref_cm_node(cm_node);
942                                 list_add(&cm_node->reset_entry, &reset_list);
943                         }
944                 }
945                 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
946         }
947
948         list_for_each_safe(list_pos, list_temp, &reset_list) {
949                 cm_node = container_of(list_pos, struct nes_cm_node,
950                                 reset_entry);
951                 {
952                         struct nes_cm_node *loopback = cm_node->loopbackpartner;
953                         if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
954                                 rem_ref_cm_node(cm_node->cm_core, cm_node);
955                         } else {
956                                 if (!loopback) {
957                                         cleanup_retrans_entry(cm_node);
958                                         err = send_reset(cm_node, NULL);
959                                         if (err) {
960                                                 cm_node->state =
961                                                          NES_CM_STATE_CLOSED;
962                                                 WARN_ON(1);
963                                         } else {
964                                                 cm_node->state =
965                                                         NES_CM_STATE_CLOSED;
966                                                 rem_ref_cm_node(
967                                                         cm_node->cm_core,
968                                                         cm_node);
969                                         }
970                                 } else {
971                                         struct nes_cm_event event;
972
973                                         event.cm_node = loopback;
974                                         event.cm_info.rem_addr =
975                                                         loopback->rem_addr;
976                                         event.cm_info.loc_addr =
977                                                         loopback->loc_addr;
978                                         event.cm_info.rem_port =
979                                                         loopback->rem_port;
980                                         event.cm_info.loc_port =
981                                                          loopback->loc_port;
982                                         event.cm_info.cm_id = loopback->cm_id;
983                                         cm_event_connect_error(&event);
984                                         loopback->state = NES_CM_STATE_CLOSED;
985
986                                         event.cm_node = cm_node;
987                                         event.cm_info.rem_addr =
988                                                          cm_node->rem_addr;
989                                         event.cm_info.loc_addr =
990                                                          cm_node->loc_addr;
991                                         event.cm_info.rem_port =
992                                                          cm_node->rem_port;
993                                         event.cm_info.loc_port =
994                                                          cm_node->loc_port;
995                                         event.cm_info.cm_id = cm_node->cm_id;
996                                         cm_event_reset(&event);
997
998                                         rem_ref_cm_node(cm_node->cm_core,
999                                                          cm_node);
1000
1001                                 }
1002                         }
1003                 }
1004         }
1005
1006         spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1007         if (!atomic_dec_return(&listener->ref_count)) {
1008                 list_del(&listener->list);
1009
1010                 /* decrement our listen node count */
1011                 atomic_dec(&cm_core->listen_node_cnt);
1012
1013                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1014
1015                 if (listener->nesvnic) {
1016                         nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1017                                         PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1018                 }
1019
1020                 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1021
1022                 kfree(listener);
1023                 listener = NULL;
1024                 ret = 0;
1025                 cm_listens_destroyed++;
1026         } else {
1027                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1028         }
1029         if (listener) {
1030                 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1031                         nes_debug(NES_DBG_CM, "destroying listener (%p)"
1032                                         " with non-zero pending accepts=%u\n",
1033                                         listener, atomic_read(&listener->pend_accepts_cnt));
1034         }
1035
1036         return ret;
1037 }
1038
1039
1040 /**
1041  * mini_cm_del_listen
1042  */
1043 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1044                 struct nes_cm_listener *listener)
1045 {
1046         listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1047         listener->cm_id = NULL; /* going to be destroyed pretty soon */
1048         return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1049 }
1050
1051
1052 /**
1053  * mini_cm_accelerated
1054  */
1055 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1056                 struct nes_cm_node *cm_node)
1057 {
1058         u32 was_timer_set;
1059         cm_node->accelerated = 1;
1060
1061         if (cm_node->accept_pend) {
1062                 BUG_ON(!cm_node->listener);
1063                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1064                 cm_node->accept_pend = 0;
1065                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1066         }
1067
1068         was_timer_set = timer_pending(&cm_core->tcp_timer);
1069         if (!was_timer_set) {
1070                 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1071                 add_timer(&cm_core->tcp_timer);
1072         }
1073
1074         return 0;
1075 }
1076
1077
1078 /**
1079  * nes_addr_resolve_neigh
1080  */
1081 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1082 {
1083         struct rtable *rt;
1084         struct flowi fl;
1085         struct neighbour *neigh;
1086         int rc = -1;
1087
1088         memset(&fl, 0, sizeof fl);
1089         fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1090         if (ip_route_output_key(&init_net, &rt, &fl)) {
1091                 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1092                                 __func__, dst_ip);
1093                 return rc;
1094         }
1095
1096         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1097         if (neigh) {
1098                 if (neigh->nud_state & NUD_VALID) {
1099                         nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1100                                   " is %pM, Gateway is 0x%08X \n", dst_ip,
1101                                   neigh->ha, ntohl(rt->rt_gateway));
1102                         nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1103                                              dst_ip, NES_ARP_ADD);
1104                         rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1105                                            NES_ARP_RESOLVE);
1106                 }
1107                 neigh_release(neigh);
1108         }
1109
1110         if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1111                 neigh_event_send(rt->u.dst.neighbour, NULL);
1112
1113         ip_rt_put(rt);
1114         return rc;
1115 }
1116
1117
1118 /**
1119  * make_cm_node - create a new instance of a cm node
1120  */
1121 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1122                 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1123                 struct nes_cm_listener *listener)
1124 {
1125         struct nes_cm_node *cm_node;
1126         struct timespec ts;
1127         int arpindex = 0;
1128         struct nes_device *nesdev;
1129         struct nes_adapter *nesadapter;
1130
1131         /* create an hte and cm_node for this instance */
1132         cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1133         if (!cm_node)
1134                 return NULL;
1135
1136         /* set our node specific transport info */
1137         cm_node->loc_addr = cm_info->loc_addr;
1138         cm_node->rem_addr = cm_info->rem_addr;
1139         cm_node->loc_port = cm_info->loc_port;
1140         cm_node->rem_port = cm_info->rem_port;
1141         cm_node->send_write0 = send_first;
1142         nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1143                   &cm_node->loc_addr, cm_node->loc_port,
1144                   &cm_node->rem_addr, cm_node->rem_port);
1145         cm_node->listener = listener;
1146         cm_node->netdev = nesvnic->netdev;
1147         cm_node->cm_id = cm_info->cm_id;
1148         memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1149
1150         nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1151                         cm_node->cm_id);
1152
1153         spin_lock_init(&cm_node->retrans_list_lock);
1154
1155         cm_node->loopbackpartner = NULL;
1156         atomic_set(&cm_node->ref_count, 1);
1157         /* associate our parent CM core */
1158         cm_node->cm_core = cm_core;
1159         cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1160         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1161         cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1162                         NES_CM_DEFAULT_RCV_WND_SCALE;
1163         ts = current_kernel_time();
1164         cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1165         cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1166                         sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1167         cm_node->tcp_cntxt.rcv_nxt = 0;
1168         /* get a unique session ID , add thread_id to an upcounter to handle race */
1169         atomic_inc(&cm_core->node_cnt);
1170         cm_node->conn_type = cm_info->conn_type;
1171         cm_node->apbvt_set = 0;
1172         cm_node->accept_pend = 0;
1173
1174         cm_node->nesvnic = nesvnic;
1175         /* get some device handles, for arp lookup */
1176         nesdev = nesvnic->nesdev;
1177         nesadapter = nesdev->nesadapter;
1178
1179         cm_node->loopbackpartner = NULL;
1180         /* get the mac addr for the remote node */
1181         if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
1182                 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1183         else
1184                 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1185         if (arpindex < 0) {
1186                 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1187                 if (arpindex < 0) {
1188                         kfree(cm_node);
1189                         return NULL;
1190                 }
1191         }
1192
1193         /* copy the mac addr to node context */
1194         memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1195         nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1196                   cm_node->rem_mac);
1197
1198         add_hte_node(cm_core, cm_node);
1199         atomic_inc(&cm_nodes_created);
1200
1201         return cm_node;
1202 }
1203
1204
1205 /**
1206  * add_ref_cm_node - destroy an instance of a cm node
1207  */
1208 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1209 {
1210         atomic_inc(&cm_node->ref_count);
1211         return 0;
1212 }
1213
1214
1215 /**
1216  * rem_ref_cm_node - destroy an instance of a cm node
1217  */
1218 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1219         struct nes_cm_node *cm_node)
1220 {
1221         unsigned long flags;
1222         struct nes_qp *nesqp;
1223
1224         if (!cm_node)
1225                 return -EINVAL;
1226
1227         spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1228         if (atomic_dec_return(&cm_node->ref_count)) {
1229                 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1230                 return 0;
1231         }
1232         list_del(&cm_node->list);
1233         atomic_dec(&cm_core->ht_node_cnt);
1234         spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1235
1236         /* if the node is destroyed before connection was accelerated */
1237         if (!cm_node->accelerated && cm_node->accept_pend) {
1238                 BUG_ON(!cm_node->listener);
1239                 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1240                 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1241         }
1242         WARN_ON(cm_node->send_entry);
1243         if (cm_node->recv_entry)
1244                 handle_recv_entry(cm_node, 0);
1245         if (cm_node->listener) {
1246                 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1247         } else {
1248                 if (cm_node->apbvt_set && cm_node->nesvnic) {
1249                         nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1250                                 PCI_FUNC(
1251                                 cm_node->nesvnic->nesdev->pcidev->devfn),
1252                                 NES_MANAGE_APBVT_DEL);
1253                 }
1254         }
1255
1256         atomic_dec(&cm_core->node_cnt);
1257         atomic_inc(&cm_nodes_destroyed);
1258         nesqp = cm_node->nesqp;
1259         if (nesqp) {
1260                 nesqp->cm_node = NULL;
1261                 nes_rem_ref(&nesqp->ibqp);
1262                 cm_node->nesqp = NULL;
1263         }
1264
1265         cm_node->freed = 1;
1266         kfree(cm_node);
1267         return 0;
1268 }
1269
1270 /**
1271  * process_options
1272  */
1273 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1274         u32 optionsize, u32 syn_packet)
1275 {
1276         u32 tmp;
1277         u32 offset = 0;
1278         union all_known_options *all_options;
1279         char got_mss_option = 0;
1280
1281         while (offset < optionsize) {
1282                 all_options = (union all_known_options *)(optionsloc + offset);
1283                 switch (all_options->as_base.optionnum) {
1284                 case OPTION_NUMBER_END:
1285                         offset = optionsize;
1286                         break;
1287                 case OPTION_NUMBER_NONE:
1288                         offset += 1;
1289                         continue;
1290                 case OPTION_NUMBER_MSS:
1291                         nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1292                                 "Size: %d\n", __func__,
1293                                 all_options->as_mss.length, offset, optionsize);
1294                         got_mss_option = 1;
1295                         if (all_options->as_mss.length != 4) {
1296                                 return 1;
1297                         } else {
1298                                 tmp = ntohs(all_options->as_mss.mss);
1299                                 if (tmp > 0 && tmp <
1300                                         cm_node->tcp_cntxt.mss)
1301                                         cm_node->tcp_cntxt.mss = tmp;
1302                         }
1303                         break;
1304                 case OPTION_NUMBER_WINDOW_SCALE:
1305                         cm_node->tcp_cntxt.snd_wscale =
1306                                 all_options->as_windowscale.shiftcount;
1307                         break;
1308                 case OPTION_NUMBER_WRITE0:
1309                         cm_node->send_write0 = 1;
1310                         break;
1311                 default:
1312                         nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1313                                 all_options->as_base.optionnum);
1314                         break;
1315                 }
1316                 offset += all_options->as_base.length;
1317         }
1318         if ((!got_mss_option) && (syn_packet))
1319                 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1320         return 0;
1321 }
1322
1323 static void drop_packet(struct sk_buff *skb)
1324 {
1325         atomic_inc(&cm_accel_dropped_pkts);
1326         dev_kfree_skb_any(skb);
1327 }
1328
1329 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1330 {
1331         nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1332                 "refcnt=%d\n", cm_node, cm_node->state,
1333                 atomic_read(&cm_node->ref_count));
1334         cm_node->tcp_cntxt.rcv_nxt++;
1335         cleanup_retrans_entry(cm_node);
1336         switch (cm_node->state) {
1337         case NES_CM_STATE_SYN_RCVD:
1338         case NES_CM_STATE_SYN_SENT:
1339         case NES_CM_STATE_ESTABLISHED:
1340         case NES_CM_STATE_MPAREQ_SENT:
1341         case NES_CM_STATE_MPAREJ_RCVD:
1342                 cm_node->state = NES_CM_STATE_LAST_ACK;
1343                 send_fin(cm_node, NULL);
1344                 break;
1345         case NES_CM_STATE_FIN_WAIT1:
1346                 cm_node->state = NES_CM_STATE_CLOSING;
1347                 send_ack(cm_node, NULL);
1348                 /* Wait for ACK as this is simultanous close..
1349                 * After we receive ACK, do not send anything..
1350                 * Just rm the node.. Done.. */
1351                 break;
1352         case NES_CM_STATE_FIN_WAIT2:
1353                 cm_node->state = NES_CM_STATE_TIME_WAIT;
1354                 send_ack(cm_node, NULL);
1355                 schedule_nes_timer(cm_node, NULL,  NES_TIMER_TYPE_CLOSE, 1, 0);
1356                 break;
1357         case NES_CM_STATE_TIME_WAIT:
1358                 cm_node->state = NES_CM_STATE_CLOSED;
1359                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1360                 break;
1361         case NES_CM_STATE_TSA:
1362         default:
1363                 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1364                         cm_node, cm_node->state);
1365                 break;
1366         }
1367 }
1368
1369
1370 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1371         struct tcphdr *tcph)
1372 {
1373
1374         int     reset = 0;      /* whether to send reset in case of err.. */
1375         int     passive_state;
1376         atomic_inc(&cm_resets_recvd);
1377         nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1378                         " refcnt=%d\n", cm_node, cm_node->state,
1379                         atomic_read(&cm_node->ref_count));
1380         cleanup_retrans_entry(cm_node);
1381         switch (cm_node->state) {
1382         case NES_CM_STATE_SYN_SENT:
1383         case NES_CM_STATE_MPAREQ_SENT:
1384                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1385                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1386                         cm_node->listener, cm_node->state);
1387                 active_open_err(cm_node, skb, reset);
1388                 break;
1389         case NES_CM_STATE_MPAREQ_RCVD:
1390                 passive_state = atomic_add_return(1, &cm_node->passive_state);
1391                 if (passive_state ==  NES_SEND_RESET_EVENT)
1392                         create_event(cm_node, NES_CM_EVENT_RESET);
1393                 cleanup_retrans_entry(cm_node);
1394                 cm_node->state = NES_CM_STATE_CLOSED;
1395                 dev_kfree_skb_any(skb);
1396                 break;
1397         case NES_CM_STATE_ESTABLISHED:
1398         case NES_CM_STATE_SYN_RCVD:
1399         case NES_CM_STATE_LISTENING:
1400                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1401                 passive_open_err(cm_node, skb, reset);
1402                 break;
1403         case NES_CM_STATE_TSA:
1404                 active_open_err(cm_node, skb, reset);
1405                 break;
1406         case NES_CM_STATE_CLOSED:
1407                 cleanup_retrans_entry(cm_node);
1408                 drop_packet(skb);
1409                 break;
1410         case NES_CM_STATE_TIME_WAIT:
1411                 cleanup_retrans_entry(cm_node);
1412                 cm_node->state = NES_CM_STATE_CLOSED;
1413                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1414                 drop_packet(skb);
1415                 break;
1416         case NES_CM_STATE_FIN_WAIT1:
1417                 cleanup_retrans_entry(cm_node);
1418                 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1419         default:
1420                 drop_packet(skb);
1421                 break;
1422         }
1423 }
1424
1425
1426 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1427 {
1428
1429         int     ret = 0;
1430         int datasize = skb->len;
1431         u8 *dataloc = skb->data;
1432
1433         enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1434         u32     res_type;
1435         ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1436         if (ret) {
1437                 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1438                 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1439                         nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1440                                 "cm_node=%p listener=%p state=%d\n", __func__,
1441                                 __LINE__, cm_node, cm_node->listener,
1442                                 cm_node->state);
1443                         active_open_err(cm_node, skb, 1);
1444                 } else {
1445                         passive_open_err(cm_node, skb, 1);
1446                 }
1447                 return;
1448         }
1449
1450         switch (cm_node->state) {
1451         case NES_CM_STATE_ESTABLISHED:
1452                 if (res_type == NES_MPA_REQUEST_REJECT) {
1453                         /*BIG problem as we are receiving the MPA.. So should
1454                         * not be REJECT.. This is Passive Open.. We can
1455                         * only receive it Reject for Active Open...*/
1456                         WARN_ON(1);
1457                 }
1458                 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1459                 type = NES_CM_EVENT_MPA_REQ;
1460                 atomic_set(&cm_node->passive_state,
1461                                 NES_PASSIVE_STATE_INDICATED);
1462                 break;
1463         case NES_CM_STATE_MPAREQ_SENT:
1464                 if (res_type == NES_MPA_REQUEST_REJECT) {
1465                         type = NES_CM_EVENT_MPA_REJECT;
1466                         cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1467                 } else {
1468                         type = NES_CM_EVENT_CONNECTED;
1469                         cm_node->state = NES_CM_STATE_TSA;
1470                 }
1471
1472                 break;
1473         default:
1474                 WARN_ON(1);
1475                 break;
1476         }
1477         dev_kfree_skb_any(skb);
1478         create_event(cm_node, type);
1479 }
1480
1481 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1482 {
1483         switch (cm_node->state) {
1484         case NES_CM_STATE_SYN_SENT:
1485         case NES_CM_STATE_MPAREQ_SENT:
1486                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1487                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1488                         cm_node->listener, cm_node->state);
1489                 active_open_err(cm_node, skb, 1);
1490                 break;
1491         case NES_CM_STATE_ESTABLISHED:
1492         case NES_CM_STATE_SYN_RCVD:
1493                 passive_open_err(cm_node, skb, 1);
1494                 break;
1495         case NES_CM_STATE_TSA:
1496         default:
1497                 drop_packet(skb);
1498         }
1499 }
1500
1501 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1502         struct sk_buff *skb)
1503 {
1504         int err;
1505
1506         err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1507         if (err)
1508                 active_open_err(cm_node, skb, 1);
1509
1510         return err;
1511 }
1512
1513 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1514         struct sk_buff *skb)
1515 {
1516         int err = 0;
1517         u32 seq;
1518         u32 ack_seq;
1519         u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1520         u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1521         u32 rcv_wnd;
1522         seq = ntohl(tcph->seq);
1523         ack_seq = ntohl(tcph->ack_seq);
1524         rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1525         if (ack_seq != loc_seq_num)
1526                 err = 1;
1527         else if ((seq + rcv_wnd) < rcv_nxt)
1528                 err = 1;
1529         if (err) {
1530                 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1531                         "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1532                         cm_node->listener, cm_node->state);
1533                 indicate_pkt_err(cm_node, skb);
1534                 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1535                         "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1536                         rcv_wnd);
1537         }
1538         return err;
1539 }
1540
1541 /*
1542  * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1543  * is created with a listener or it may comein as rexmitted packet which in
1544  * that case will be just dropped.
1545  */
1546
1547 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1548         struct tcphdr *tcph)
1549 {
1550         int ret;
1551         u32 inc_sequence;
1552         int optionsize;
1553
1554         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1555         skb_trim(skb, 0);
1556         inc_sequence = ntohl(tcph->seq);
1557
1558         switch (cm_node->state) {
1559         case NES_CM_STATE_SYN_SENT:
1560         case NES_CM_STATE_MPAREQ_SENT:
1561                 /* Rcvd syn on active open connection*/
1562                 active_open_err(cm_node, skb, 1);
1563                 break;
1564         case NES_CM_STATE_LISTENING:
1565                 /* Passive OPEN */
1566                 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1567                                 cm_node->listener->backlog) {
1568                         nes_debug(NES_DBG_CM, "drop syn due to backlog "
1569                                 "pressure \n");
1570                         cm_backlog_drops++;
1571                         passive_open_err(cm_node, skb, 0);
1572                         break;
1573                 }
1574                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1575                         1);
1576                 if (ret) {
1577                         passive_open_err(cm_node, skb, 0);
1578                         /* drop pkt */
1579                         break;
1580                 }
1581                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1582                 BUG_ON(cm_node->send_entry);
1583                 cm_node->accept_pend = 1;
1584                 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1585
1586                 cm_node->state = NES_CM_STATE_SYN_RCVD;
1587                 send_syn(cm_node, 1, skb);
1588                 break;
1589         case NES_CM_STATE_CLOSED:
1590                 cleanup_retrans_entry(cm_node);
1591                 send_reset(cm_node, skb);
1592                 break;
1593         case NES_CM_STATE_TSA:
1594         case NES_CM_STATE_ESTABLISHED:
1595         case NES_CM_STATE_FIN_WAIT1:
1596         case NES_CM_STATE_FIN_WAIT2:
1597         case NES_CM_STATE_MPAREQ_RCVD:
1598         case NES_CM_STATE_LAST_ACK:
1599         case NES_CM_STATE_CLOSING:
1600         case NES_CM_STATE_UNKNOWN:
1601         default:
1602                 drop_packet(skb);
1603                 break;
1604         }
1605 }
1606
1607 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1608         struct tcphdr *tcph)
1609 {
1610
1611         int ret;
1612         u32 inc_sequence;
1613         int optionsize;
1614
1615         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1616         skb_trim(skb, 0);
1617         inc_sequence = ntohl(tcph->seq);
1618         switch (cm_node->state) {
1619         case NES_CM_STATE_SYN_SENT:
1620                 cleanup_retrans_entry(cm_node);
1621                 /* active open */
1622                 if (check_syn(cm_node, tcph, skb))
1623                         return;
1624                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1625                 /* setup options */
1626                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1627                 if (ret) {
1628                         nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1629                                 cm_node);
1630                         break;
1631                 }
1632                 cleanup_retrans_entry(cm_node);
1633                 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1634                 send_mpa_request(cm_node, skb);
1635                 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1636                 break;
1637         case NES_CM_STATE_MPAREQ_RCVD:
1638                 /* passive open, so should not be here */
1639                 passive_open_err(cm_node, skb, 1);
1640                 break;
1641         case NES_CM_STATE_LISTENING:
1642         case NES_CM_STATE_CLOSED:
1643                 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1644                 cleanup_retrans_entry(cm_node);
1645                 send_reset(cm_node, skb);
1646                 break;
1647         case NES_CM_STATE_ESTABLISHED:
1648         case NES_CM_STATE_FIN_WAIT1:
1649         case NES_CM_STATE_FIN_WAIT2:
1650         case NES_CM_STATE_LAST_ACK:
1651         case NES_CM_STATE_TSA:
1652         case NES_CM_STATE_CLOSING:
1653         case NES_CM_STATE_UNKNOWN:
1654         case NES_CM_STATE_MPAREQ_SENT:
1655         default:
1656                 drop_packet(skb);
1657                 break;
1658         }
1659 }
1660
1661 static void handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1662         struct tcphdr *tcph)
1663 {
1664         int datasize = 0;
1665         u32 inc_sequence;
1666         u32 rem_seq_ack;
1667         u32 rem_seq;
1668         int ret;
1669         int optionsize;
1670         optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1671
1672         if (check_seq(cm_node, tcph, skb))
1673                 return;
1674
1675         skb_pull(skb, tcph->doff << 2);
1676         inc_sequence = ntohl(tcph->seq);
1677         rem_seq = ntohl(tcph->seq);
1678         rem_seq_ack =  ntohl(tcph->ack_seq);
1679         datasize = skb->len;
1680         cleanup_retrans_entry(cm_node);
1681         switch (cm_node->state) {
1682         case NES_CM_STATE_SYN_RCVD:
1683                 /* Passive OPEN */
1684                 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1685                 if (ret)
1686                         break;
1687                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1688                 if (cm_node->tcp_cntxt.rem_ack_num !=
1689                     cm_node->tcp_cntxt.loc_seq_num) {
1690                         nes_debug(NES_DBG_CM, "rem_ack_num != loc_seq_num\n");
1691                         cleanup_retrans_entry(cm_node);
1692                         send_reset(cm_node, skb);
1693                         return;
1694                 }
1695                 cm_node->state = NES_CM_STATE_ESTABLISHED;
1696                 cleanup_retrans_entry(cm_node);
1697                 if (datasize) {
1698                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1699                         handle_rcv_mpa(cm_node, skb);
1700                 } else { /* rcvd ACK only */
1701                         dev_kfree_skb_any(skb);
1702                         cleanup_retrans_entry(cm_node);
1703                  }
1704                 break;
1705         case NES_CM_STATE_ESTABLISHED:
1706                 /* Passive OPEN */
1707                 cleanup_retrans_entry(cm_node);
1708                 if (datasize) {
1709                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1710                         handle_rcv_mpa(cm_node, skb);
1711                 } else
1712                         drop_packet(skb);
1713                 break;
1714         case NES_CM_STATE_MPAREQ_SENT:
1715                 cleanup_retrans_entry(cm_node);
1716                 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1717                 if (datasize) {
1718                         cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1719                         handle_rcv_mpa(cm_node, skb);
1720                 } else { /* Could be just an ack pkt.. */
1721                         cleanup_retrans_entry(cm_node);
1722                         dev_kfree_skb_any(skb);
1723                 }
1724                 break;
1725         case NES_CM_STATE_LISTENING:
1726         case NES_CM_STATE_CLOSED:
1727                 cleanup_retrans_entry(cm_node);
1728                 send_reset(cm_node, skb);
1729                 break;
1730         case NES_CM_STATE_LAST_ACK:
1731                 cleanup_retrans_entry(cm_node);
1732                 cm_node->state = NES_CM_STATE_CLOSED;
1733                 cm_node->cm_id->rem_ref(cm_node->cm_id);
1734         case NES_CM_STATE_CLOSING:
1735                 cleanup_retrans_entry(cm_node);
1736                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1737                 drop_packet(skb);
1738                 break;
1739         case NES_CM_STATE_FIN_WAIT1:
1740                 cleanup_retrans_entry(cm_node);
1741                 drop_packet(skb);
1742                 cm_node->state = NES_CM_STATE_FIN_WAIT2;
1743                 break;
1744         case NES_CM_STATE_SYN_SENT:
1745         case NES_CM_STATE_FIN_WAIT2:
1746         case NES_CM_STATE_TSA:
1747         case NES_CM_STATE_MPAREQ_RCVD:
1748         case NES_CM_STATE_UNKNOWN:
1749         default:
1750                 drop_packet(skb);
1751                 break;
1752         }
1753 }
1754
1755
1756
1757 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1758         struct sk_buff *skb, int optionsize, int passive)
1759 {
1760         u8 *optionsloc = (u8 *)&tcph[1];
1761         if (optionsize) {
1762                 if (process_options(cm_node, optionsloc, optionsize,
1763                         (u32)tcph->syn)) {
1764                         nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1765                                 __func__, cm_node);
1766                         if (passive)
1767                                 passive_open_err(cm_node, skb, 1);
1768                         else
1769                                 active_open_err(cm_node, skb, 1);
1770                         return 1;
1771                 }
1772         }
1773
1774         cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1775                         cm_node->tcp_cntxt.snd_wscale;
1776
1777         if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1778                 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1779         return 0;
1780 }
1781
1782 /*
1783  * active_open_err() will send reset() if flag set..
1784  * It will also send ABORT event.
1785  */
1786
1787 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1788         int reset)
1789 {
1790         cleanup_retrans_entry(cm_node);
1791         if (reset) {
1792                 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1793                                 "state=%d\n", cm_node, cm_node->state);
1794                 add_ref_cm_node(cm_node);
1795                 send_reset(cm_node, skb);
1796         } else
1797                 dev_kfree_skb_any(skb);
1798
1799         cm_node->state = NES_CM_STATE_CLOSED;
1800         create_event(cm_node, NES_CM_EVENT_ABORTED);
1801 }
1802
1803 /*
1804  * passive_open_err() will either do a reset() or will free up the skb and
1805  * remove the cm_node.
1806  */
1807
1808 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1809         int reset)
1810 {
1811         cleanup_retrans_entry(cm_node);
1812         cm_node->state = NES_CM_STATE_CLOSED;
1813         if (reset) {
1814                 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1815                         "cm_node=%p state =%d\n", cm_node, cm_node->state);
1816                 send_reset(cm_node, skb);
1817         } else {
1818                 dev_kfree_skb_any(skb);
1819                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1820         }
1821 }
1822
1823 /*
1824  * free_retrans_entry() routines assumes that the retrans_list_lock has
1825  * been acquired before calling.
1826  */
1827 static void free_retrans_entry(struct nes_cm_node *cm_node)
1828 {
1829         struct nes_timer_entry *send_entry;
1830         send_entry = cm_node->send_entry;
1831         if (send_entry) {
1832                 cm_node->send_entry = NULL;
1833                 dev_kfree_skb_any(send_entry->skb);
1834                 kfree(send_entry);
1835                 rem_ref_cm_node(cm_node->cm_core, cm_node);
1836         }
1837 }
1838
1839 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1840 {
1841         unsigned long flags;
1842
1843         spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1844         free_retrans_entry(cm_node);
1845         spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1846 }
1847
1848 /**
1849  * process_packet
1850  * Returns skb if to be freed, else it will return NULL if already used..
1851  */
1852 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1853         struct nes_cm_core *cm_core)
1854 {
1855         enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1856         struct tcphdr *tcph = tcp_hdr(skb);
1857         u32     fin_set = 0;
1858         skb_pull(skb, ip_hdr(skb)->ihl << 2);
1859
1860         nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1861                 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1862                 tcph->ack, tcph->rst, tcph->fin);
1863
1864         if (tcph->rst)
1865                 pkt_type = NES_PKT_TYPE_RST;
1866         else if (tcph->syn) {
1867                 pkt_type = NES_PKT_TYPE_SYN;
1868                 if (tcph->ack)
1869                         pkt_type = NES_PKT_TYPE_SYNACK;
1870         } else if (tcph->ack)
1871                 pkt_type = NES_PKT_TYPE_ACK;
1872         if (tcph->fin)
1873                 fin_set = 1;
1874
1875         switch (pkt_type) {
1876         case NES_PKT_TYPE_SYN:
1877                 handle_syn_pkt(cm_node, skb, tcph);
1878                 break;
1879         case NES_PKT_TYPE_SYNACK:
1880                 handle_synack_pkt(cm_node, skb, tcph);
1881                 break;
1882         case NES_PKT_TYPE_ACK:
1883                 handle_ack_pkt(cm_node, skb, tcph);
1884                 if (fin_set)
1885                         handle_fin_pkt(cm_node);
1886                 break;
1887         case NES_PKT_TYPE_RST:
1888                 handle_rst_pkt(cm_node, skb, tcph);
1889                 break;
1890         default:
1891                 drop_packet(skb);
1892                 if (fin_set)
1893                         handle_fin_pkt(cm_node);
1894                 break;
1895         }
1896 }
1897
1898 /**
1899  * mini_cm_listen - create a listen node with params
1900  */
1901 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1902         struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1903 {
1904         struct nes_cm_listener *listener;
1905         unsigned long flags;
1906
1907         nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1908                 cm_info->loc_addr, cm_info->loc_port);
1909
1910         /* cannot have multiple matching listeners */
1911         listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1912                         htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1913         if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1914                 /* find automatically incs ref count ??? */
1915                 atomic_dec(&listener->ref_count);
1916                 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1917                 return NULL;
1918         }
1919
1920         if (!listener) {
1921                 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1922                 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1923                 if (!listener) {
1924                         nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1925                         return NULL;
1926                 }
1927
1928                 listener->loc_addr = htonl(cm_info->loc_addr);
1929                 listener->loc_port = htons(cm_info->loc_port);
1930                 listener->reused_node = 0;
1931
1932                 atomic_set(&listener->ref_count, 1);
1933         }
1934         /* pasive case */
1935         /* find already inc'ed the ref count */
1936         else {
1937                 listener->reused_node = 1;
1938         }
1939
1940         listener->cm_id = cm_info->cm_id;
1941         atomic_set(&listener->pend_accepts_cnt, 0);
1942         listener->cm_core = cm_core;
1943         listener->nesvnic = nesvnic;
1944         atomic_inc(&cm_core->node_cnt);
1945
1946         listener->conn_type = cm_info->conn_type;
1947         listener->backlog = cm_info->backlog;
1948         listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1949
1950         if (!listener->reused_node) {
1951                 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1952                 list_add(&listener->list, &cm_core->listen_list.list);
1953                 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1954                 atomic_inc(&cm_core->listen_node_cnt);
1955         }
1956
1957         nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1958                         " listener = %p, backlog = %d, cm_id = %p.\n",
1959                         cm_info->loc_addr, cm_info->loc_port,
1960                         listener, listener->backlog, listener->cm_id);
1961
1962         return listener;
1963 }
1964
1965
1966 /**
1967  * mini_cm_connect - make a connection node with params
1968  */
1969 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1970         struct nes_vnic *nesvnic, u16 private_data_len,
1971         void *private_data, struct nes_cm_info *cm_info)
1972 {
1973         int ret = 0;
1974         struct nes_cm_node *cm_node;
1975         struct nes_cm_listener *loopbackremotelistener;
1976         struct nes_cm_node *loopbackremotenode;
1977         struct nes_cm_info loopback_cm_info;
1978         u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1979         struct ietf_mpa_frame *mpa_frame = NULL;
1980
1981         /* create a CM connection node */
1982         cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1983         if (!cm_node)
1984                 return NULL;
1985         mpa_frame = &cm_node->mpa_frame;
1986         strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1987         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1988         mpa_frame->rev =  IETF_MPA_VERSION;
1989         mpa_frame->priv_data_len = htons(private_data_len);
1990
1991         /* set our node side to client (active) side */
1992         cm_node->tcp_cntxt.client = 1;
1993         cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1994
1995         if (cm_info->loc_addr == cm_info->rem_addr) {
1996                 loopbackremotelistener = find_listener(cm_core,
1997                                 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1998                                 NES_CM_LISTENER_ACTIVE_STATE);
1999                 if (loopbackremotelistener == NULL) {
2000                         create_event(cm_node, NES_CM_EVENT_ABORTED);
2001                 } else {
2002                         atomic_inc(&cm_loopbacks);
2003                         loopback_cm_info = *cm_info;
2004                         loopback_cm_info.loc_port = cm_info->rem_port;
2005                         loopback_cm_info.rem_port = cm_info->loc_port;
2006                         loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2007                         loopbackremotenode = make_cm_node(cm_core, nesvnic,
2008                                 &loopback_cm_info, loopbackremotelistener);
2009                         loopbackremotenode->loopbackpartner = cm_node;
2010                         loopbackremotenode->tcp_cntxt.rcv_wscale =
2011                                 NES_CM_DEFAULT_RCV_WND_SCALE;
2012                         cm_node->loopbackpartner = loopbackremotenode;
2013                         memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2014                                 private_data_len);
2015                         loopbackremotenode->mpa_frame_size = private_data_len;
2016
2017                         /* we are done handling this state. */
2018                         /* set node to a TSA state */
2019                         cm_node->state = NES_CM_STATE_TSA;
2020                         cm_node->tcp_cntxt.rcv_nxt =
2021                                 loopbackremotenode->tcp_cntxt.loc_seq_num;
2022                         loopbackremotenode->tcp_cntxt.rcv_nxt =
2023                                 cm_node->tcp_cntxt.loc_seq_num;
2024                         cm_node->tcp_cntxt.max_snd_wnd =
2025                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2026                         loopbackremotenode->tcp_cntxt.max_snd_wnd =
2027                                 cm_node->tcp_cntxt.rcv_wnd;
2028                         cm_node->tcp_cntxt.snd_wnd =
2029                                 loopbackremotenode->tcp_cntxt.rcv_wnd;
2030                         loopbackremotenode->tcp_cntxt.snd_wnd =
2031                                 cm_node->tcp_cntxt.rcv_wnd;
2032                         cm_node->tcp_cntxt.snd_wscale =
2033                                 loopbackremotenode->tcp_cntxt.rcv_wscale;
2034                         loopbackremotenode->tcp_cntxt.snd_wscale =
2035                                 cm_node->tcp_cntxt.rcv_wscale;
2036                         loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2037                         create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2038                 }
2039                 return cm_node;
2040         }
2041
2042         /* set our node side to client (active) side */
2043         cm_node->tcp_cntxt.client = 1;
2044         /* init our MPA frame ptr */
2045         memcpy(mpa_frame->priv_data, private_data, private_data_len);
2046
2047         cm_node->mpa_frame_size = mpa_frame_size;
2048
2049         /* send a syn and goto syn sent state */
2050         cm_node->state = NES_CM_STATE_SYN_SENT;
2051         ret = send_syn(cm_node, 0, NULL);
2052
2053         if (ret) {
2054                 /* error in sending the syn free up the cm_node struct */
2055                 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2056                         "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2057                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2058                         cm_node->cm_id);
2059                 rem_ref_cm_node(cm_node->cm_core, cm_node);
2060                 cm_node = NULL;
2061         }
2062
2063         if (cm_node)
2064                 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2065                         "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2066                         cm_node->rem_addr, cm_node->rem_port, cm_node,
2067                         cm_node->cm_id);
2068
2069         return cm_node;
2070 }
2071
2072
2073 /**
2074  * mini_cm_accept - accept a connection
2075  * This function is never called
2076  */
2077 static int mini_cm_accept(struct nes_cm_core *cm_core,
2078         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2079 {
2080         return 0;
2081 }
2082
2083
2084 /**
2085  * mini_cm_reject - reject and teardown a connection
2086  */
2087 static int mini_cm_reject(struct nes_cm_core *cm_core,
2088         struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
2089 {
2090         int ret = 0;
2091         int err = 0;
2092         int passive_state;
2093         struct nes_cm_event event;
2094         struct iw_cm_id *cm_id = cm_node->cm_id;
2095         struct nes_cm_node *loopback = cm_node->loopbackpartner;
2096
2097         nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2098                 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2099
2100         if (cm_node->tcp_cntxt.client)
2101                 return ret;
2102         cleanup_retrans_entry(cm_node);
2103
2104         if (!loopback) {
2105                 passive_state = atomic_add_return(1, &cm_node->passive_state);
2106                 if (passive_state == NES_SEND_RESET_EVENT) {
2107                         cm_node->state = NES_CM_STATE_CLOSED;
2108                         rem_ref_cm_node(cm_core, cm_node);
2109                 } else {
2110                         ret = send_mpa_reject(cm_node);
2111                         if (ret) {
2112                                 cm_node->state = NES_CM_STATE_CLOSED;
2113                                 err = send_reset(cm_node, NULL);
2114                                 if (err)
2115                                         WARN_ON(1);
2116                         } else
2117                                 cm_id->add_ref(cm_id);
2118                 }
2119         } else {
2120                 cm_node->cm_id = NULL;
2121                 event.cm_node = loopback;
2122                 event.cm_info.rem_addr = loopback->rem_addr;
2123                 event.cm_info.loc_addr = loopback->loc_addr;
2124                 event.cm_info.rem_port = loopback->rem_port;
2125                 event.cm_info.loc_port = loopback->loc_port;
2126                 event.cm_info.cm_id = loopback->cm_id;
2127                 cm_event_mpa_reject(&event);
2128                 rem_ref_cm_node(cm_core, cm_node);
2129                 loopback->state = NES_CM_STATE_CLOSING;
2130
2131                 cm_id = loopback->cm_id;
2132                 rem_ref_cm_node(cm_core, loopback);
2133                 cm_id->rem_ref(cm_id);
2134         }
2135
2136         return ret;
2137 }
2138
2139
2140 /**
2141  * mini_cm_close
2142  */
2143 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2144 {
2145         int ret = 0;
2146
2147         if (!cm_core || !cm_node)
2148                 return -EINVAL;
2149
2150         switch (cm_node->state) {
2151         case NES_CM_STATE_SYN_RCVD:
2152         case NES_CM_STATE_SYN_SENT:
2153         case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2154         case NES_CM_STATE_ESTABLISHED:
2155         case NES_CM_STATE_ACCEPTING:
2156         case NES_CM_STATE_MPAREQ_SENT:
2157         case NES_CM_STATE_MPAREQ_RCVD:
2158                 cleanup_retrans_entry(cm_node);
2159                 send_reset(cm_node, NULL);
2160                 break;
2161         case NES_CM_STATE_CLOSE_WAIT:
2162                 cm_node->state = NES_CM_STATE_LAST_ACK;
2163                 send_fin(cm_node, NULL);
2164                 break;
2165         case NES_CM_STATE_FIN_WAIT1:
2166         case NES_CM_STATE_FIN_WAIT2:
2167         case NES_CM_STATE_LAST_ACK:
2168         case NES_CM_STATE_TIME_WAIT:
2169         case NES_CM_STATE_CLOSING:
2170                 ret = -1;
2171                 break;
2172         case NES_CM_STATE_MPAREJ_RCVD:
2173         case NES_CM_STATE_LISTENING:
2174         case NES_CM_STATE_UNKNOWN:
2175         case NES_CM_STATE_INITED:
2176         case NES_CM_STATE_CLOSED:
2177                 ret = rem_ref_cm_node(cm_core, cm_node);
2178                 break;
2179         case NES_CM_STATE_TSA:
2180                 if (cm_node->send_entry)
2181                         printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2182                                 "send_entry=%p\n", cm_node->send_entry);
2183                 ret = rem_ref_cm_node(cm_core, cm_node);
2184                 break;
2185         }
2186         return ret;
2187 }
2188
2189
2190 /**
2191  * recv_pkt - recv an ETHERNET packet, and process it through CM
2192  * node state machine
2193  */
2194 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2195         struct nes_vnic *nesvnic, struct sk_buff *skb)
2196 {
2197         struct nes_cm_node *cm_node = NULL;
2198         struct nes_cm_listener *listener = NULL;
2199         struct iphdr *iph;
2200         struct tcphdr *tcph;
2201         struct nes_cm_info nfo;
2202         int skb_handled = 1;
2203         __be32 tmp_daddr, tmp_saddr;
2204
2205         if (!skb)
2206                 return 0;
2207         if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2208                 return 0;
2209         }
2210
2211         iph = (struct iphdr *)skb->data;
2212         tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2213
2214         nfo.loc_addr = ntohl(iph->daddr);
2215         nfo.loc_port = ntohs(tcph->dest);
2216         nfo.rem_addr = ntohl(iph->saddr);
2217         nfo.rem_port = ntohs(tcph->source);
2218
2219         tmp_daddr = cpu_to_be32(iph->daddr);
2220         tmp_saddr = cpu_to_be32(iph->saddr);
2221
2222         nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2223                   &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2224
2225         do {
2226                 cm_node = find_node(cm_core,
2227                         nfo.rem_port, nfo.rem_addr,
2228                         nfo.loc_port, nfo.loc_addr);
2229
2230                 if (!cm_node) {
2231                         /* Only type of packet accepted are for */
2232                         /* the PASSIVE open (syn only) */
2233                         if ((!tcph->syn) || (tcph->ack)) {
2234                                 skb_handled = 0;
2235                                 break;
2236                         }
2237                         listener = find_listener(cm_core, nfo.loc_addr,
2238                                 nfo.loc_port,
2239                                 NES_CM_LISTENER_ACTIVE_STATE);
2240                         if (!listener) {
2241                                 nfo.cm_id = NULL;
2242                                 nfo.conn_type = 0;
2243                                 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2244                                 skb_handled = 0;
2245                                 break;
2246                         }
2247                         nfo.cm_id = listener->cm_id;
2248                         nfo.conn_type = listener->conn_type;
2249                         cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2250                                 listener);
2251                         if (!cm_node) {
2252                                 nes_debug(NES_DBG_CM, "Unable to allocate "
2253                                         "node\n");
2254                                 cm_packets_dropped++;
2255                                 atomic_dec(&listener->ref_count);
2256                                 dev_kfree_skb_any(skb);
2257                                 break;
2258                         }
2259                         if (!tcph->rst && !tcph->fin) {
2260                                 cm_node->state = NES_CM_STATE_LISTENING;
2261                         } else {
2262                                 cm_packets_dropped++;
2263                                 rem_ref_cm_node(cm_core, cm_node);
2264                                 dev_kfree_skb_any(skb);
2265                                 break;
2266                         }
2267                         add_ref_cm_node(cm_node);
2268                 } else if (cm_node->state == NES_CM_STATE_TSA) {
2269                         rem_ref_cm_node(cm_core, cm_node);
2270                         atomic_inc(&cm_accel_dropped_pkts);
2271                         dev_kfree_skb_any(skb);
2272                         break;
2273                 }
2274                 skb_reset_network_header(skb);
2275                 skb_set_transport_header(skb, sizeof(*tcph));
2276                 skb->len = ntohs(iph->tot_len);
2277                 process_packet(cm_node, skb, cm_core);
2278                 rem_ref_cm_node(cm_core, cm_node);
2279         } while (0);
2280         return skb_handled;
2281 }
2282
2283
2284 /**
2285  * nes_cm_alloc_core - allocate a top level instance of a cm core
2286  */
2287 static struct nes_cm_core *nes_cm_alloc_core(void)
2288 {
2289         struct nes_cm_core *cm_core;
2290
2291         /* setup the CM core */
2292         /* alloc top level core control structure */
2293         cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2294         if (!cm_core)
2295                 return NULL;
2296
2297         INIT_LIST_HEAD(&cm_core->connected_nodes);
2298         init_timer(&cm_core->tcp_timer);
2299         cm_core->tcp_timer.function = nes_cm_timer_tick;
2300
2301         cm_core->mtu   = NES_CM_DEFAULT_MTU;
2302         cm_core->state = NES_CM_STATE_INITED;
2303         cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2304
2305         atomic_set(&cm_core->events_posted, 0);
2306
2307         cm_core->api = &nes_cm_api;
2308
2309         spin_lock_init(&cm_core->ht_lock);
2310         spin_lock_init(&cm_core->listen_list_lock);
2311
2312         INIT_LIST_HEAD(&cm_core->listen_list.list);
2313
2314         nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2315
2316         nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2317         cm_core->event_wq = create_singlethread_workqueue("nesewq");
2318         cm_core->post_event = nes_cm_post_event;
2319         nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2320         cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2321
2322         print_core(cm_core);
2323         return cm_core;
2324 }
2325
2326
2327 /**
2328  * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2329  */
2330 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2331 {
2332         nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2333
2334         if (!cm_core)
2335                 return -EINVAL;
2336
2337         barrier();
2338
2339         if (timer_pending(&cm_core->tcp_timer)) {
2340                 del_timer(&cm_core->tcp_timer);
2341         }
2342
2343         destroy_workqueue(cm_core->event_wq);
2344         destroy_workqueue(cm_core->disconn_wq);
2345         nes_debug(NES_DBG_CM, "\n");
2346         kfree(cm_core);
2347
2348         return 0;
2349 }
2350
2351
2352 /**
2353  * mini_cm_get
2354  */
2355 static int mini_cm_get(struct nes_cm_core *cm_core)
2356 {
2357         return cm_core->state;
2358 }
2359
2360
2361 /**
2362  * mini_cm_set
2363  */
2364 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2365 {
2366         int ret = 0;
2367
2368         switch (type) {
2369         case NES_CM_SET_PKT_SIZE:
2370                 cm_core->mtu = value;
2371                 break;
2372         case NES_CM_SET_FREE_PKT_Q_SIZE:
2373                 cm_core->free_tx_pkt_max = value;
2374                 break;
2375         default:
2376                 /* unknown set option */
2377                 ret = -EINVAL;
2378         }
2379
2380         return ret;
2381 }
2382
2383
2384 /**
2385  * nes_cm_init_tsa_conn setup HW; MPA frames must be
2386  * successfully exchanged when this is called
2387  */
2388 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2389 {
2390         int ret = 0;
2391
2392         if (!nesqp)
2393                 return -EINVAL;
2394
2395         nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2396                         NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2397                         NES_QPCONTEXT_MISC_DROS);
2398
2399         if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2400                 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2401
2402         nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2403
2404         nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2405
2406         nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2407                         (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2408
2409         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2410                         (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2411                         NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2412
2413         nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2414                         (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2415                         NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2416
2417         nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2418         nesqp->nesqp_context->ts_recent = 0;
2419         nesqp->nesqp_context->ts_age = 0;
2420         nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2421         nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2422         nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2423         nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2424                         cm_node->tcp_cntxt.rcv_wscale);
2425         nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2426         nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2427         nesqp->nesqp_context->srtt = 0;
2428         nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2429         nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2430         nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2431         nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2432         nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2433         nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2434
2435         nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2436                         " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2437                         nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2438                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2439                         cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2440                         le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2441                         le32_to_cpu(nesqp->nesqp_context->misc));
2442         nes_debug(NES_DBG_CM, "  snd_wnd  = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2443         nes_debug(NES_DBG_CM, "  snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2444         nes_debug(NES_DBG_CM, "  max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2445
2446         nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2447         cm_node->state = NES_CM_STATE_TSA;
2448
2449         return ret;
2450 }
2451
2452
2453 /**
2454  * nes_cm_disconn
2455  */
2456 int nes_cm_disconn(struct nes_qp *nesqp)
2457 {
2458         unsigned long flags;
2459
2460         spin_lock_irqsave(&nesqp->lock, flags);
2461         if (nesqp->disconn_pending == 0) {
2462                 nesqp->disconn_pending++;
2463                 spin_unlock_irqrestore(&nesqp->lock, flags);
2464                 /* init our disconnect work element, to */
2465                 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2466
2467                 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2468         } else
2469                 spin_unlock_irqrestore(&nesqp->lock, flags);
2470
2471         return 0;
2472 }
2473
2474
2475 /**
2476  * nes_disconnect_worker
2477  */
2478 static void nes_disconnect_worker(struct work_struct *work)
2479 {
2480         struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2481
2482         nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2483                         nesqp->last_aeq, nesqp->hwqp.qp_id);
2484         nes_cm_disconn_true(nesqp);
2485 }
2486
2487
2488 /**
2489  * nes_cm_disconn_true
2490  */
2491 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2492 {
2493         unsigned long flags;
2494         int ret = 0;
2495         struct iw_cm_id *cm_id;
2496         struct iw_cm_event cm_event;
2497         struct nes_vnic *nesvnic;
2498         u16 last_ae;
2499         u8 original_hw_tcp_state;
2500         u8 original_ibqp_state;
2501         u8 issued_disconnect_reset = 0;
2502
2503         if (!nesqp) {
2504                 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2505                 return -1;
2506         }
2507
2508         spin_lock_irqsave(&nesqp->lock, flags);
2509         cm_id = nesqp->cm_id;
2510         /* make sure we havent already closed this connection */
2511         if (!cm_id) {
2512                 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2513                                 nesqp->hwqp.qp_id);
2514                 spin_unlock_irqrestore(&nesqp->lock, flags);
2515                 return -1;
2516         }
2517
2518         nesvnic = to_nesvnic(nesqp->ibqp.device);
2519         nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2520
2521         original_hw_tcp_state = nesqp->hw_tcp_state;
2522         original_ibqp_state   = nesqp->ibqp_state;
2523         last_ae = nesqp->last_aeq;
2524
2525
2526         nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2527
2528         if ((nesqp->cm_id) && (cm_id->event_handler)) {
2529                 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2530                                 ((original_ibqp_state == IB_QPS_RTS) &&
2531                                 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2532                         atomic_inc(&cm_disconnects);
2533                         cm_event.event = IW_CM_EVENT_DISCONNECT;
2534                         if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2535                                 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2536                                 nes_debug(NES_DBG_CM, "Generating a CM "
2537                                         "Disconnect Event (status reset) for "
2538                                         "QP%u, cm_id = %p. \n",
2539                                         nesqp->hwqp.qp_id, cm_id);
2540                         } else
2541                                 cm_event.status = IW_CM_EVENT_STATUS_OK;
2542
2543                         cm_event.local_addr = cm_id->local_addr;
2544                         cm_event.remote_addr = cm_id->remote_addr;
2545                         cm_event.private_data = NULL;
2546                         cm_event.private_data_len = 0;
2547
2548                         nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2549                                 " for  QP%u, SQ Head = %u, SQ Tail = %u. "
2550                                 "cm_id = %p, refcount = %u.\n",
2551                                 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2552                                 nesqp->hwqp.sq_tail, cm_id,
2553                                 atomic_read(&nesqp->refcount));
2554
2555                         spin_unlock_irqrestore(&nesqp->lock, flags);
2556                         ret = cm_id->event_handler(cm_id, &cm_event);
2557                         if (ret)
2558                                 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2559                                         "returned, ret=%d\n", ret);
2560                         spin_lock_irqsave(&nesqp->lock, flags);
2561                 }
2562
2563                 nesqp->disconn_pending = 0;
2564                 /* There might have been another AE while the lock was released */
2565                 original_hw_tcp_state = nesqp->hw_tcp_state;
2566                 original_ibqp_state   = nesqp->ibqp_state;
2567                 last_ae = nesqp->last_aeq;
2568
2569                 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2570                                 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2571                                  (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2572                                  (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2573                                  (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2574                         atomic_inc(&cm_closes);
2575                         nesqp->cm_id = NULL;
2576                         nesqp->in_disconnect = 0;
2577                         spin_unlock_irqrestore(&nesqp->lock, flags);
2578                         nes_disconnect(nesqp, 1);
2579
2580                         cm_id->provider_data = nesqp;
2581                         /* Send up the close complete event */
2582                         cm_event.event = IW_CM_EVENT_CLOSE;
2583                         cm_event.status = IW_CM_EVENT_STATUS_OK;
2584                         cm_event.provider_data = cm_id->provider_data;
2585                         cm_event.local_addr = cm_id->local_addr;
2586                         cm_event.remote_addr = cm_id->remote_addr;
2587                         cm_event.private_data = NULL;
2588                         cm_event.private_data_len = 0;
2589
2590                         ret = cm_id->event_handler(cm_id, &cm_event);
2591                         if (ret) {
2592                                 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2593                         }
2594
2595                         cm_id->rem_ref(cm_id);
2596
2597                         spin_lock_irqsave(&nesqp->lock, flags);
2598                         if (nesqp->flush_issued == 0) {
2599                                 nesqp->flush_issued = 1;
2600                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2601                                 flush_wqes(nesvnic->nesdev, nesqp,
2602                                         NES_CQP_FLUSH_RQ, 1);
2603                         } else
2604                                 spin_unlock_irqrestore(&nesqp->lock, flags);
2605                 } else {
2606                         cm_id = nesqp->cm_id;
2607                         spin_unlock_irqrestore(&nesqp->lock, flags);
2608                         /* check to see if the inbound reset beat the outbound reset */
2609                         if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2610                                 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2611                                         "due to inbound reset beating the "
2612                                         "outbound reset.\n", nesqp->hwqp.qp_id);
2613                         }
2614                 }
2615         } else {
2616                 nesqp->disconn_pending = 0;
2617                 spin_unlock_irqrestore(&nesqp->lock, flags);
2618         }
2619
2620         return 0;
2621 }
2622
2623
2624 /**
2625  * nes_disconnect
2626  */
2627 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2628 {
2629         int ret = 0;
2630         struct nes_vnic *nesvnic;
2631         struct nes_device *nesdev;
2632
2633         nesvnic = to_nesvnic(nesqp->ibqp.device);
2634         if (!nesvnic)
2635                 return -EINVAL;
2636
2637         nesdev = nesvnic->nesdev;
2638
2639         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2640                         atomic_read(&nesvnic->netdev->refcnt));
2641
2642         if (nesqp->active_conn) {
2643
2644                 /* indicate this connection is NOT active */
2645                 nesqp->active_conn = 0;
2646         } else {
2647                 /* Need to free the Last Streaming Mode Message */
2648                 if (nesqp->ietf_frame) {
2649                         pci_free_consistent(nesdev->pcidev,
2650                                         nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2651                                         nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2652                 }
2653         }
2654
2655         /* close the CM node down if it is still active */
2656         if (nesqp->cm_node) {
2657                 nes_debug(NES_DBG_CM, "Call close API\n");
2658
2659                 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2660         }
2661
2662         return ret;
2663 }
2664
2665
2666 /**
2667  * nes_accept
2668  */
2669 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2670 {
2671         u64 u64temp;
2672         struct ib_qp *ibqp;
2673         struct nes_qp *nesqp;
2674         struct nes_vnic *nesvnic;
2675         struct nes_device *nesdev;
2676         struct nes_cm_node *cm_node;
2677         struct nes_adapter *adapter;
2678         struct ib_qp_attr attr;
2679         struct iw_cm_event cm_event;
2680         struct nes_hw_qp_wqe *wqe;
2681         struct nes_v4_quad nes_quad;
2682         u32 crc_value;
2683         int ret;
2684         int passive_state;
2685
2686         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2687         if (!ibqp)
2688                 return -EINVAL;
2689
2690         /* get all our handles */
2691         nesqp = to_nesqp(ibqp);
2692         nesvnic = to_nesvnic(nesqp->ibqp.device);
2693         nesdev = nesvnic->nesdev;
2694         adapter = nesdev->nesadapter;
2695
2696         cm_node = (struct nes_cm_node *)cm_id->provider_data;
2697         nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2698                 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2699                 nesvnic->netdev->name);
2700
2701         /* associate the node with the QP */
2702         nesqp->cm_node = (void *)cm_node;
2703         cm_node->nesqp = nesqp;
2704         nes_add_ref(&nesqp->ibqp);
2705
2706         nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2707                 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2708         atomic_inc(&cm_accepts);
2709
2710         nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2711                         atomic_read(&nesvnic->netdev->refcnt));
2712
2713         /* allocate the ietf frame and space for private data */
2714         nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2715                 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2716                 &nesqp->ietf_frame_pbase);
2717
2718         if (!nesqp->ietf_frame) {
2719                 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2720                         "data\n");
2721                 return -ENOMEM;
2722         }
2723
2724
2725         /* setup the MPA frame */
2726         nesqp->private_data_len = conn_param->private_data_len;
2727         memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2728
2729         memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2730                         conn_param->private_data_len);
2731
2732         nesqp->ietf_frame->priv_data_len =
2733                 cpu_to_be16(conn_param->private_data_len);
2734         nesqp->ietf_frame->rev = mpa_version;
2735         nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2736
2737         /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2738         wqe = &nesqp->hwqp.sq_vbase[0];
2739
2740         if (cm_id->remote_addr.sin_addr.s_addr !=
2741                         cm_id->local_addr.sin_addr.s_addr) {
2742                 u64temp = (unsigned long)nesqp;
2743                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2744                 set_wqe_64bit_value(wqe->wqe_words,
2745                         NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2746                         u64temp);
2747                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2748                         cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2749                         NES_IWARP_SQ_WQE_WRPDU);
2750                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2751                         cpu_to_le32(conn_param->private_data_len +
2752                         sizeof(struct ietf_mpa_frame));
2753                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2754                         cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2755                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2756                         cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2757                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2758                         cpu_to_le32(conn_param->private_data_len +
2759                         sizeof(struct ietf_mpa_frame));
2760                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2761
2762                 nesqp->nesqp_context->ird_ord_sizes |=
2763                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2764                         NES_QPCONTEXT_ORDIRD_WRPDU);
2765         } else {
2766                 nesqp->nesqp_context->ird_ord_sizes |=
2767                         cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
2768         }
2769         nesqp->skip_lsmm = 1;
2770
2771
2772         /* Cache the cm_id in the qp */
2773         nesqp->cm_id = cm_id;
2774         cm_node->cm_id = cm_id;
2775
2776         /*  nesqp->cm_node = (void *)cm_id->provider_data; */
2777         cm_id->provider_data = nesqp;
2778         nesqp->active_conn   = 0;
2779
2780         if (cm_node->state == NES_CM_STATE_TSA)
2781                 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2782                         cm_node);
2783
2784         nes_cm_init_tsa_conn(nesqp, cm_node);
2785
2786         nesqp->nesqp_context->tcpPorts[0] =
2787                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2788         nesqp->nesqp_context->tcpPorts[1] =
2789                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2790
2791         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2792                 nesqp->nesqp_context->ip0 =
2793                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2794         else
2795                 nesqp->nesqp_context->ip0 =
2796                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2797
2798         nesqp->nesqp_context->misc2 |= cpu_to_le32(
2799                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2800                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2801
2802         nesqp->nesqp_context->arp_index_vlan |=
2803                 cpu_to_le32(nes_arp_table(nesdev,
2804                         le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2805                         NES_ARP_RESOLVE) << 16);
2806
2807         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2808                 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2809
2810         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2811
2812         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2813                 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2814         nesqp->nesqp_context->ird_ord_sizes |=
2815                 cpu_to_le32((u32)conn_param->ord);
2816
2817         memset(&nes_quad, 0, sizeof(nes_quad));
2818         nes_quad.DstIpAdrIndex =
2819                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2820         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2821                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2822         else
2823                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2824         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2825         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2826
2827         /* Produce hash key */
2828         crc_value = get_crc_value(&nes_quad);
2829         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2830         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2831                 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2832
2833         nesqp->hte_index &= adapter->hte_index_mask;
2834         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2835
2836         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2837
2838         nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2839                         "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2840                         "private data length=%zu.\n", nesqp->hwqp.qp_id,
2841                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
2842                         ntohs(cm_id->remote_addr.sin_port),
2843                         ntohl(cm_id->local_addr.sin_addr.s_addr),
2844                         ntohs(cm_id->local_addr.sin_port),
2845                         le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2846                         le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2847                         conn_param->private_data_len +
2848                         sizeof(struct ietf_mpa_frame));
2849
2850
2851         /* notify OF layer that accept event was successful */
2852         cm_id->add_ref(cm_id);
2853
2854         cm_event.event = IW_CM_EVENT_ESTABLISHED;
2855         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2856         cm_event.provider_data = (void *)nesqp;
2857         cm_event.local_addr = cm_id->local_addr;
2858         cm_event.remote_addr = cm_id->remote_addr;
2859         cm_event.private_data = NULL;
2860         cm_event.private_data_len = 0;
2861         ret = cm_id->event_handler(cm_id, &cm_event);
2862         attr.qp_state = IB_QPS_RTS;
2863         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2864         if (cm_node->loopbackpartner) {
2865                 cm_node->loopbackpartner->mpa_frame_size =
2866                         nesqp->private_data_len;
2867                 /* copy entire MPA frame to our cm_node's frame */
2868                 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2869                         nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2870                 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2871         }
2872         if (ret)
2873                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2874                         "ret=%d\n", __func__, __LINE__, ret);
2875
2876         passive_state = atomic_add_return(1, &cm_node->passive_state);
2877         if (passive_state == NES_SEND_RESET_EVENT)
2878                 create_event(cm_node, NES_CM_EVENT_RESET);
2879         return 0;
2880 }
2881
2882
2883 /**
2884  * nes_reject
2885  */
2886 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2887 {
2888         struct nes_cm_node *cm_node;
2889         struct nes_cm_node *loopback;
2890
2891         struct nes_cm_core *cm_core;
2892
2893         atomic_inc(&cm_rejects);
2894         cm_node = (struct nes_cm_node *) cm_id->provider_data;
2895         loopback = cm_node->loopbackpartner;
2896         cm_core = cm_node->cm_core;
2897         cm_node->cm_id = cm_id;
2898         cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2899
2900         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
2901                 return -EINVAL;
2902
2903         strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2904         if (loopback) {
2905                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
2906                 loopback->mpa_frame.priv_data_len = pdata_len;
2907                 loopback->mpa_frame_size = sizeof(struct ietf_mpa_frame) +
2908                                 pdata_len;
2909         } else {
2910                 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2911                 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2912         }
2913
2914         cm_node->mpa_frame.rev = mpa_version;
2915         cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2916
2917         return cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2918 }
2919
2920
2921 /**
2922  * nes_connect
2923  * setup and launch cm connect node
2924  */
2925 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2926 {
2927         struct ib_qp *ibqp;
2928         struct nes_qp *nesqp;
2929         struct nes_vnic *nesvnic;
2930         struct nes_device *nesdev;
2931         struct nes_cm_node *cm_node;
2932         struct nes_cm_info cm_info;
2933
2934         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2935         if (!ibqp)
2936                 return -EINVAL;
2937         nesqp = to_nesqp(ibqp);
2938         if (!nesqp)
2939                 return -EINVAL;
2940         nesvnic = to_nesvnic(nesqp->ibqp.device);
2941         if (!nesvnic)
2942                 return -EINVAL;
2943         nesdev  = nesvnic->nesdev;
2944         if (!nesdev)
2945                 return -EINVAL;
2946
2947         nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2948                 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2949                 ntohl(nesvnic->local_ipaddr),
2950                 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2951                 ntohs(cm_id->remote_addr.sin_port),
2952                 ntohl(cm_id->local_addr.sin_addr.s_addr),
2953                 ntohs(cm_id->local_addr.sin_port));
2954
2955         atomic_inc(&cm_connects);
2956         nesqp->active_conn = 1;
2957
2958         /* cache the cm_id in the qp */
2959         nesqp->cm_id = cm_id;
2960
2961         cm_id->provider_data = nesqp;
2962
2963         nesqp->private_data_len = conn_param->private_data_len;
2964         nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2965         nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2966         nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2967                 conn_param->private_data_len);
2968
2969         if (cm_id->local_addr.sin_addr.s_addr !=
2970                 cm_id->remote_addr.sin_addr.s_addr)
2971                 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2972                         PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2973
2974         /* set up the connection params for the node */
2975         cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
2976         cm_info.loc_port = htons(cm_id->local_addr.sin_port);
2977         cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
2978         cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
2979         cm_info.cm_id = cm_id;
2980         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2981
2982         cm_id->add_ref(cm_id);
2983
2984         /* create a connect CM node connection */
2985         cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
2986                 conn_param->private_data_len, (void *)conn_param->private_data,
2987                 &cm_info);
2988         if (!cm_node) {
2989                 if (cm_id->local_addr.sin_addr.s_addr !=
2990                                 cm_id->remote_addr.sin_addr.s_addr)
2991                         nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2992                                 PCI_FUNC(nesdev->pcidev->devfn),
2993                                 NES_MANAGE_APBVT_DEL);
2994
2995                 cm_id->rem_ref(cm_id);
2996                 return -ENOMEM;
2997         }
2998
2999         cm_node->apbvt_set = 1;
3000         nesqp->cm_node = cm_node;
3001         cm_node->nesqp = nesqp;
3002         nes_add_ref(&nesqp->ibqp);
3003
3004         return 0;
3005 }
3006
3007
3008 /**
3009  * nes_create_listen
3010  */
3011 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3012 {
3013         struct nes_vnic *nesvnic;
3014         struct nes_cm_listener *cm_node;
3015         struct nes_cm_info cm_info;
3016         struct nes_adapter *adapter;
3017         int err;
3018
3019
3020         nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3021                         cm_id, ntohs(cm_id->local_addr.sin_port));
3022
3023         nesvnic = to_nesvnic(cm_id->device);
3024         if (!nesvnic)
3025                 return -EINVAL;
3026         adapter = nesvnic->nesdev->nesadapter;
3027         nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3028                         nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3029
3030         nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3031                         nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3032
3033         /* setup listen params in our api call struct */
3034         cm_info.loc_addr = nesvnic->local_ipaddr;
3035         cm_info.loc_port = cm_id->local_addr.sin_port;
3036         cm_info.backlog = backlog;
3037         cm_info.cm_id = cm_id;
3038
3039         cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3040
3041
3042         cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3043         if (!cm_node) {
3044                 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3045                                 __func__, __LINE__);
3046                 return -ENOMEM;
3047         }
3048
3049         cm_id->provider_data = cm_node;
3050
3051         if (!cm_node->reused_node) {
3052                 err = nes_manage_apbvt(nesvnic,
3053                         ntohs(cm_id->local_addr.sin_port),
3054                         PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3055                         NES_MANAGE_APBVT_ADD);
3056                 if (err) {
3057                         printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3058                                 err);
3059                         g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3060                         return err;
3061                 }
3062                 cm_listens_created++;
3063         }
3064
3065         cm_id->add_ref(cm_id);
3066         cm_id->provider_data = (void *)cm_node;
3067
3068
3069         return 0;
3070 }
3071
3072
3073 /**
3074  * nes_destroy_listen
3075  */
3076 int nes_destroy_listen(struct iw_cm_id *cm_id)
3077 {
3078         if (cm_id->provider_data)
3079                 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3080         else
3081                 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3082
3083         cm_id->rem_ref(cm_id);
3084
3085         return 0;
3086 }
3087
3088
3089 /**
3090  * nes_cm_recv
3091  */
3092 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3093 {
3094         int rc = 0;
3095         cm_packets_received++;
3096         if ((g_cm_core) && (g_cm_core->api)) {
3097                 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3098         } else {
3099                 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3100                                 " cm is not setup properly.\n");
3101         }
3102
3103         return rc;
3104 }
3105
3106
3107 /**
3108  * nes_cm_start
3109  * Start and init a cm core module
3110  */
3111 int nes_cm_start(void)
3112 {
3113         nes_debug(NES_DBG_CM, "\n");
3114         /* create the primary CM core, pass this handle to subsequent core inits */
3115         g_cm_core = nes_cm_alloc_core();
3116         if (g_cm_core) {
3117                 return 0;
3118         } else {
3119                 return -ENOMEM;
3120         }
3121 }
3122
3123
3124 /**
3125  * nes_cm_stop
3126  * stop and dealloc all cm core instances
3127  */
3128 int nes_cm_stop(void)
3129 {
3130         g_cm_core->api->destroy_cm_core(g_cm_core);
3131         return 0;
3132 }
3133
3134
3135 /**
3136  * cm_event_connected
3137  * handle a connected event, setup QPs and HW
3138  */
3139 static void cm_event_connected(struct nes_cm_event *event)
3140 {
3141         u64 u64temp;
3142         struct nes_qp *nesqp;
3143         struct nes_vnic *nesvnic;
3144         struct nes_device *nesdev;
3145         struct nes_cm_node *cm_node;
3146         struct nes_adapter *nesadapter;
3147         struct ib_qp_attr attr;
3148         struct iw_cm_id *cm_id;
3149         struct iw_cm_event cm_event;
3150         struct nes_hw_qp_wqe *wqe;
3151         struct nes_v4_quad nes_quad;
3152         u32 crc_value;
3153         int ret;
3154
3155         /* get all our handles */
3156         cm_node = event->cm_node;
3157         cm_id = cm_node->cm_id;
3158         nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3159         nesqp = (struct nes_qp *)cm_id->provider_data;
3160         nesvnic = to_nesvnic(nesqp->ibqp.device);
3161         nesdev = nesvnic->nesdev;
3162         nesadapter = nesdev->nesadapter;
3163
3164         if (nesqp->destroyed) {
3165                 return;
3166         }
3167         atomic_inc(&cm_connecteds);
3168         nes_debug(NES_DBG_CM, "QP%u attempting to connect to  0x%08X:0x%04X on"
3169                         " local port 0x%04X. jiffies = %lu.\n",
3170                         nesqp->hwqp.qp_id,
3171                         ntohl(cm_id->remote_addr.sin_addr.s_addr),
3172                         ntohs(cm_id->remote_addr.sin_port),
3173                         ntohs(cm_id->local_addr.sin_port),
3174                         jiffies);
3175
3176         nes_cm_init_tsa_conn(nesqp, cm_node);
3177
3178         /* set the QP tsa context */
3179         nesqp->nesqp_context->tcpPorts[0] =
3180                 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3181         nesqp->nesqp_context->tcpPorts[1] =
3182                 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3183         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3184                 nesqp->nesqp_context->ip0 =
3185                         cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3186         else
3187                 nesqp->nesqp_context->ip0 =
3188                         cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3189
3190         nesqp->nesqp_context->misc2 |= cpu_to_le32(
3191                         (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3192                         NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3193         nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3194                         nes_arp_table(nesdev,
3195                         le32_to_cpu(nesqp->nesqp_context->ip0),
3196                         NULL, NES_ARP_RESOLVE) << 16);
3197         nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3198                         jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3199         nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3200         nesqp->nesqp_context->ird_ord_sizes |=
3201                         cpu_to_le32((u32)1 <<
3202                         NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3203
3204         /* Adjust tail for not having a LSMM */
3205         nesqp->hwqp.sq_tail = 1;
3206
3207 #if defined(NES_SEND_FIRST_WRITE)
3208         if (cm_node->send_write0) {
3209                 nes_debug(NES_DBG_CM, "Sending first write.\n");
3210                 wqe = &nesqp->hwqp.sq_vbase[0];
3211                 u64temp = (unsigned long)nesqp;
3212                 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3213                 set_wqe_64bit_value(wqe->wqe_words,
3214                                 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3215                 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3216                         cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3217                 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3218                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3219                 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3220                 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3221                 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3222
3223                 /* use the reserved spot on the WQ for the extra first WQE */
3224                 nesqp->nesqp_context->ird_ord_sizes &=
3225                         cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3226                                                 NES_QPCONTEXT_ORDIRD_WRPDU |
3227                                                 NES_QPCONTEXT_ORDIRD_ALSMM));
3228                 nesqp->skip_lsmm = 1;
3229                 nesqp->hwqp.sq_tail = 0;
3230                 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3231                                 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3232         }
3233 #endif
3234
3235         memset(&nes_quad, 0, sizeof(nes_quad));
3236
3237         nes_quad.DstIpAdrIndex =
3238                 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3239         if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3240                 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3241         else
3242                 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3243         nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3244         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3245
3246         /* Produce hash key */
3247         crc_value = get_crc_value(&nes_quad);
3248         nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3249         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3250                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3251
3252         nesqp->hte_index &= nesadapter->hte_index_mask;
3253         nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3254
3255         nesqp->ietf_frame = &cm_node->mpa_frame;
3256         nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3257         cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3258
3259         /* notify OF layer we successfully created the requested connection */
3260         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3261         cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3262         cm_event.provider_data = cm_id->provider_data;
3263         cm_event.local_addr.sin_family = AF_INET;
3264         cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3265         cm_event.remote_addr = cm_id->remote_addr;
3266
3267         cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3268         cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3269
3270         cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3271         ret = cm_id->event_handler(cm_id, &cm_event);
3272         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3273
3274         if (ret)
3275                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3276                         "ret=%d\n", __func__, __LINE__, ret);
3277         attr.qp_state = IB_QPS_RTS;
3278         nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3279
3280         nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3281                 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3282
3283         return;
3284 }
3285
3286
3287 /**
3288  * cm_event_connect_error
3289  */
3290 static void cm_event_connect_error(struct nes_cm_event *event)
3291 {
3292         struct nes_qp *nesqp;
3293         struct iw_cm_id *cm_id;
3294         struct iw_cm_event cm_event;
3295         /* struct nes_cm_info cm_info; */
3296         int ret;
3297
3298         if (!event->cm_node)
3299                 return;
3300
3301         cm_id = event->cm_node->cm_id;
3302         if (!cm_id) {
3303                 return;
3304         }
3305
3306         nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3307         nesqp = cm_id->provider_data;
3308
3309         if (!nesqp) {
3310                 return;
3311         }
3312
3313         /* notify OF layer about this connection error event */
3314         /* cm_id->rem_ref(cm_id); */
3315         nesqp->cm_id = NULL;
3316         cm_id->provider_data = NULL;
3317         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3318         cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3319         cm_event.provider_data = cm_id->provider_data;
3320         cm_event.local_addr = cm_id->local_addr;
3321         cm_event.remote_addr = cm_id->remote_addr;
3322         cm_event.private_data = NULL;
3323         cm_event.private_data_len = 0;
3324
3325         nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3326                 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3327                 cm_event.remote_addr.sin_addr.s_addr);
3328
3329         ret = cm_id->event_handler(cm_id, &cm_event);
3330         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3331         if (ret)
3332                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3333                         "ret=%d\n", __func__, __LINE__, ret);
3334         cm_id->rem_ref(cm_id);
3335
3336         rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3337         return;
3338 }
3339
3340
3341 /**
3342  * cm_event_reset
3343  */
3344 static void cm_event_reset(struct nes_cm_event *event)
3345 {
3346         struct nes_qp *nesqp;
3347         struct iw_cm_id *cm_id;
3348         struct iw_cm_event cm_event;
3349         /* struct nes_cm_info cm_info; */
3350         int ret;
3351
3352         if (!event->cm_node)
3353                 return;
3354
3355         if (!event->cm_node->cm_id)
3356                 return;
3357
3358         cm_id = event->cm_node->cm_id;
3359
3360         nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3361         nesqp = cm_id->provider_data;
3362
3363         nesqp->cm_id = NULL;
3364         /* cm_id->provider_data = NULL; */
3365         cm_event.event = IW_CM_EVENT_DISCONNECT;
3366         cm_event.status = IW_CM_EVENT_STATUS_RESET;
3367         cm_event.provider_data = cm_id->provider_data;
3368         cm_event.local_addr = cm_id->local_addr;
3369         cm_event.remote_addr = cm_id->remote_addr;
3370         cm_event.private_data = NULL;
3371         cm_event.private_data_len = 0;
3372
3373         ret = cm_id->event_handler(cm_id, &cm_event);
3374         cm_id->add_ref(cm_id);
3375         atomic_inc(&cm_closes);
3376         cm_event.event = IW_CM_EVENT_CLOSE;
3377         cm_event.status = IW_CM_EVENT_STATUS_OK;
3378         cm_event.provider_data = cm_id->provider_data;
3379         cm_event.local_addr = cm_id->local_addr;
3380         cm_event.remote_addr = cm_id->remote_addr;
3381         cm_event.private_data = NULL;
3382         cm_event.private_data_len = 0;
3383         nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3384         ret = cm_id->event_handler(cm_id, &cm_event);
3385
3386         nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3387
3388
3389         /* notify OF layer about this connection error event */
3390         cm_id->rem_ref(cm_id);
3391
3392         return;
3393 }
3394
3395
3396 /**
3397  * cm_event_mpa_req
3398  */
3399 static void cm_event_mpa_req(struct nes_cm_event *event)
3400 {
3401         struct iw_cm_id   *cm_id;
3402         struct iw_cm_event cm_event;
3403         int ret;
3404         struct nes_cm_node *cm_node;
3405
3406         cm_node = event->cm_node;
3407         if (!cm_node)
3408                 return;
3409         cm_id = cm_node->cm_id;
3410
3411         atomic_inc(&cm_connect_reqs);
3412         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3413                         cm_node, cm_id, jiffies);
3414
3415         cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3416         cm_event.status = IW_CM_EVENT_STATUS_OK;
3417         cm_event.provider_data = (void *)cm_node;
3418
3419         cm_event.local_addr.sin_family = AF_INET;
3420         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3421         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3422
3423         cm_event.remote_addr.sin_family = AF_INET;
3424         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3425         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3426         cm_event.private_data = cm_node->mpa_frame_buf;
3427         cm_event.private_data_len  = (u8) cm_node->mpa_frame_size;
3428
3429         ret = cm_id->event_handler(cm_id, &cm_event);
3430         if (ret)
3431                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3432                                 __func__, __LINE__, ret);
3433         return;
3434 }
3435
3436
3437 static void cm_event_mpa_reject(struct nes_cm_event *event)
3438 {
3439         struct iw_cm_id   *cm_id;
3440         struct iw_cm_event cm_event;
3441         struct nes_cm_node *cm_node;
3442         int ret;
3443
3444         cm_node = event->cm_node;
3445         if (!cm_node)
3446                 return;
3447         cm_id = cm_node->cm_id;
3448
3449         atomic_inc(&cm_connect_reqs);
3450         nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3451                         cm_node, cm_id, jiffies);
3452
3453         cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3454         cm_event.status = -ECONNREFUSED;
3455         cm_event.provider_data = cm_id->provider_data;
3456
3457         cm_event.local_addr.sin_family = AF_INET;
3458         cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3459         cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3460
3461         cm_event.remote_addr.sin_family = AF_INET;
3462         cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3463         cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3464
3465         cm_event.private_data = cm_node->mpa_frame_buf;
3466         cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3467
3468         nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3469                         "remove_addr=%08x\n",
3470                         cm_event.local_addr.sin_addr.s_addr,
3471                         cm_event.remote_addr.sin_addr.s_addr);
3472
3473         ret = cm_id->event_handler(cm_id, &cm_event);
3474         if (ret)
3475                 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3476                                 __func__, __LINE__, ret);
3477
3478         return;
3479 }
3480
3481
3482 static void nes_cm_event_handler(struct work_struct *);
3483
3484 /**
3485  * nes_cm_post_event
3486  * post an event to the cm event handler
3487  */
3488 static int nes_cm_post_event(struct nes_cm_event *event)
3489 {
3490         atomic_inc(&event->cm_node->cm_core->events_posted);
3491         add_ref_cm_node(event->cm_node);
3492         event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3493         INIT_WORK(&event->event_work, nes_cm_event_handler);
3494         nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3495                 event->cm_node, event);
3496
3497         queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3498
3499         nes_debug(NES_DBG_CM, "Exit\n");
3500         return 0;
3501 }
3502
3503
3504 /**
3505  * nes_cm_event_handler
3506  * worker function to handle cm events
3507  * will free instance of nes_cm_event
3508  */
3509 static void nes_cm_event_handler(struct work_struct *work)
3510 {
3511         struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3512                         event_work);
3513         struct nes_cm_core *cm_core;
3514
3515         if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3516                 return;
3517
3518         cm_core = event->cm_node->cm_core;
3519         nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3520                 event, event->type, atomic_read(&cm_core->events_posted));
3521
3522         switch (event->type) {
3523         case NES_CM_EVENT_MPA_REQ:
3524                 cm_event_mpa_req(event);
3525                 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3526                         event->cm_node);
3527                 break;
3528         case NES_CM_EVENT_RESET:
3529                 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3530                         event->cm_node);
3531                 cm_event_reset(event);
3532                 break;
3533         case NES_CM_EVENT_CONNECTED:
3534                 if ((!event->cm_node->cm_id) ||
3535                         (event->cm_node->state != NES_CM_STATE_TSA))
3536                         break;
3537                 cm_event_connected(event);
3538                 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3539                 break;
3540         case NES_CM_EVENT_MPA_REJECT:
3541                 if ((!event->cm_node->cm_id) ||
3542                                 (event->cm_node->state == NES_CM_STATE_TSA))
3543                         break;
3544                 cm_event_mpa_reject(event);
3545                 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3546                 break;
3547
3548         case NES_CM_EVENT_ABORTED:
3549                 if ((!event->cm_node->cm_id) ||
3550                         (event->cm_node->state == NES_CM_STATE_TSA))
3551                         break;
3552                 cm_event_connect_error(event);
3553                 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3554                 break;
3555         case NES_CM_EVENT_DROPPED_PKT:
3556                 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3557                 break;
3558         default:
3559                 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3560                 break;
3561         }
3562
3563         atomic_dec(&cm_core->events_posted);
3564         event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3565         rem_ref_cm_node(cm_core, event->cm_node);
3566         kfree(event);
3567
3568         return;
3569 }