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