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mac80211: convert to %pM away from print_mac
[deliverable/linux.git] / drivers / infiniband / hw / nes / nes_cm.c
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 void 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 struct sk_buff *form_cm_frame(struct sk_buff *, struct nes_cm_node *,
96 void *, u32, void *, u32, u8);
97 static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node);
98 static int add_ref_cm_node(struct nes_cm_node *);
99 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
100
101 static int nes_cm_disconn_true(struct nes_qp *);
102 static int nes_cm_post_event(struct nes_cm_event *event);
103 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
104 static void nes_disconnect_worker(struct work_struct *work);
105
106 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
107 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
108 static int send_reset(struct nes_cm_node *, struct sk_buff *);
109 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
110 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
111 static void process_packet(struct nes_cm_node *, struct sk_buff *,
112 struct nes_cm_core *);
113
114 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
115 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
116 static void cleanup_retrans_entry(struct nes_cm_node *);
117 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *,
118 enum nes_cm_event_type);
119 static void free_retrans_entry(struct nes_cm_node *cm_node);
120 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
121 struct sk_buff *skb, int optionsize, int passive);
122
123 /* CM event handler functions */
124 static void cm_event_connected(struct nes_cm_event *);
125 static void cm_event_connect_error(struct nes_cm_event *);
126 static void cm_event_reset(struct nes_cm_event *);
127 static void cm_event_mpa_req(struct nes_cm_event *);
128
129 static void print_core(struct nes_cm_core *core);
130
131 /* External CM API Interface */
132 /* instance of function pointers for client API */
133 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
134 static struct nes_cm_ops nes_cm_api = {
135 mini_cm_accelerated,
136 mini_cm_listen,
137 mini_cm_del_listen,
138 mini_cm_connect,
139 mini_cm_close,
140 mini_cm_accept,
141 mini_cm_reject,
142 mini_cm_recv_pkt,
143 mini_cm_dealloc_core,
144 mini_cm_get,
145 mini_cm_set
146 };
147
148 static struct nes_cm_core *g_cm_core;
149
150 atomic_t cm_connects;
151 atomic_t cm_accepts;
152 atomic_t cm_disconnects;
153 atomic_t cm_closes;
154 atomic_t cm_connecteds;
155 atomic_t cm_connect_reqs;
156 atomic_t cm_rejects;
157
158
159 /**
160 * create_event
161 */
162 static struct nes_cm_event *create_event(struct nes_cm_node *cm_node,
163 enum nes_cm_event_type type)
164 {
165 struct nes_cm_event *event;
166
167 if (!cm_node->cm_id)
168 return NULL;
169
170 /* allocate an empty event */
171 event = kzalloc(sizeof(*event), GFP_ATOMIC);
172
173 if (!event)
174 return NULL;
175
176 event->type = type;
177 event->cm_node = cm_node;
178 event->cm_info.rem_addr = cm_node->rem_addr;
179 event->cm_info.loc_addr = cm_node->loc_addr;
180 event->cm_info.rem_port = cm_node->rem_port;
181 event->cm_info.loc_port = cm_node->loc_port;
182 event->cm_info.cm_id = cm_node->cm_id;
183
184 nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
185 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
186 cm_node, event, type, event->cm_info.loc_addr,
187 event->cm_info.loc_port, event->cm_info.rem_addr,
188 event->cm_info.rem_port);
189
190 nes_cm_post_event(event);
191 return event;
192 }
193
194
195 /**
196 * send_mpa_request
197 */
198 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
199 {
200 int ret;
201 if (!skb) {
202 nes_debug(NES_DBG_CM, "skb set to NULL\n");
203 return -1;
204 }
205
206 /* send an MPA Request frame */
207 form_cm_frame(skb, cm_node, NULL, 0, &cm_node->mpa_frame,
208 cm_node->mpa_frame_size, SET_ACK);
209
210 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
211 if (ret < 0)
212 return ret;
213
214 return 0;
215 }
216
217
218 /**
219 * recv_mpa - process a received TCP pkt, we are expecting an
220 * IETF MPA frame
221 */
222 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 len)
223 {
224 struct ietf_mpa_frame *mpa_frame;
225
226 /* assume req frame is in tcp data payload */
227 if (len < sizeof(struct ietf_mpa_frame)) {
228 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
229 return -1;
230 }
231
232 mpa_frame = (struct ietf_mpa_frame *)buffer;
233 cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
234
235 if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
236 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
237 " complete (%x + %x != %x)\n",
238 cm_node->mpa_frame_size, (u32)sizeof(struct ietf_mpa_frame), len);
239 return -1;
240 }
241
242 /* copy entire MPA frame to our cm_node's frame */
243 memcpy(cm_node->mpa_frame_buf, buffer + sizeof(struct ietf_mpa_frame),
244 cm_node->mpa_frame_size);
245
246 return 0;
247 }
248
249
250 /**
251 * form_cm_frame - get a free packet and build empty frame Use
252 * node info to build.
253 */
254 static struct sk_buff *form_cm_frame(struct sk_buff *skb,
255 struct nes_cm_node *cm_node, void *options, u32 optionsize,
256 void *data, u32 datasize, u8 flags)
257 {
258 struct tcphdr *tcph;
259 struct iphdr *iph;
260 struct ethhdr *ethh;
261 u8 *buf;
262 u16 packetsize = sizeof(*iph);
263
264 packetsize += sizeof(*tcph);
265 packetsize += optionsize + datasize;
266
267 memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
268
269 skb->len = 0;
270 buf = skb_put(skb, packetsize + ETH_HLEN);
271
272 ethh = (struct ethhdr *) buf;
273 buf += ETH_HLEN;
274
275 iph = (struct iphdr *)buf;
276 buf += sizeof(*iph);
277 tcph = (struct tcphdr *)buf;
278 skb_reset_mac_header(skb);
279 skb_set_network_header(skb, ETH_HLEN);
280 skb_set_transport_header(skb, ETH_HLEN+sizeof(*iph));
281 buf += sizeof(*tcph);
282
283 skb->ip_summed = CHECKSUM_PARTIAL;
284 skb->protocol = htons(0x800);
285 skb->data_len = 0;
286 skb->mac_len = ETH_HLEN;
287
288 memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
289 memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
290 ethh->h_proto = htons(0x0800);
291
292 iph->version = IPVERSION;
293 iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
294 iph->tos = 0;
295 iph->tot_len = htons(packetsize);
296 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
297
298 iph->frag_off = htons(0x4000);
299 iph->ttl = 0x40;
300 iph->protocol = 0x06; /* IPPROTO_TCP */
301
302 iph->saddr = htonl(cm_node->loc_addr);
303 iph->daddr = htonl(cm_node->rem_addr);
304
305 tcph->source = htons(cm_node->loc_port);
306 tcph->dest = htons(cm_node->rem_port);
307 tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
308
309 if (flags & SET_ACK) {
310 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
311 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
312 tcph->ack = 1;
313 } else
314 tcph->ack_seq = 0;
315
316 if (flags & SET_SYN) {
317 cm_node->tcp_cntxt.loc_seq_num++;
318 tcph->syn = 1;
319 } else
320 cm_node->tcp_cntxt.loc_seq_num += datasize;
321
322 if (flags & SET_FIN) {
323 cm_node->tcp_cntxt.loc_seq_num++;
324 tcph->fin = 1;
325 }
326
327 if (flags & SET_RST)
328 tcph->rst = 1;
329
330 tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
331 tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
332 tcph->urg_ptr = 0;
333 if (optionsize)
334 memcpy(buf, options, optionsize);
335 buf += optionsize;
336 if (datasize)
337 memcpy(buf, data, datasize);
338
339 skb_shinfo(skb)->nr_frags = 0;
340 cm_packets_created++;
341
342 return skb;
343 }
344
345
346 /**
347 * print_core - dump a cm core
348 */
349 static void print_core(struct nes_cm_core *core)
350 {
351 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
352 nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
353 if (!core)
354 return;
355 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
356
357 nes_debug(NES_DBG_CM, "State : %u \n", core->state);
358
359 nes_debug(NES_DBG_CM, "Tx Free cnt : %u \n", skb_queue_len(&core->tx_free_list));
360 nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
361 nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
362
363 nes_debug(NES_DBG_CM, "core : %p \n", core);
364
365 nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
366 }
367
368
369 /**
370 * schedule_nes_timer
371 * note - cm_node needs to be protected before calling this. Encase in:
372 * rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
373 */
374 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
375 enum nes_timer_type type, int send_retrans,
376 int close_when_complete)
377 {
378 unsigned long flags;
379 struct nes_cm_core *cm_core = cm_node->cm_core;
380 struct nes_timer_entry *new_send;
381 int ret = 0;
382 u32 was_timer_set;
383
384 if (!cm_node)
385 return -EINVAL;
386 new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
387 if (!new_send)
388 return -1;
389
390 /* new_send->timetosend = currenttime */
391 new_send->retrycount = NES_DEFAULT_RETRYS;
392 new_send->retranscount = NES_DEFAULT_RETRANS;
393 new_send->skb = skb;
394 new_send->timetosend = jiffies;
395 new_send->type = type;
396 new_send->netdev = cm_node->netdev;
397 new_send->send_retrans = send_retrans;
398 new_send->close_when_complete = close_when_complete;
399
400 if (type == NES_TIMER_TYPE_CLOSE) {
401 new_send->timetosend += (HZ/10);
402 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
403 list_add_tail(&new_send->list, &cm_node->recv_list);
404 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
405 }
406
407 if (type == NES_TIMER_TYPE_SEND) {
408 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
409 atomic_inc(&new_send->skb->users);
410 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
411 cm_node->send_entry = new_send;
412 add_ref_cm_node(cm_node);
413 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
414 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
415
416 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
417 if (ret != NETDEV_TX_OK) {
418 nes_debug(NES_DBG_CM, "Error sending packet %p "
419 "(jiffies = %lu)\n", new_send, jiffies);
420 atomic_dec(&new_send->skb->users);
421 new_send->timetosend = jiffies;
422 } else {
423 cm_packets_sent++;
424 if (!send_retrans) {
425 cleanup_retrans_entry(cm_node);
426 if (close_when_complete)
427 rem_ref_cm_node(cm_core, cm_node);
428 return ret;
429 }
430 }
431 }
432
433 was_timer_set = timer_pending(&cm_core->tcp_timer);
434
435 if (!was_timer_set) {
436 cm_core->tcp_timer.expires = new_send->timetosend;
437 add_timer(&cm_core->tcp_timer);
438 }
439
440 return ret;
441 }
442
443
444 /**
445 * nes_cm_timer_tick
446 */
447 static void nes_cm_timer_tick(unsigned long pass)
448 {
449 unsigned long flags, qplockflags;
450 unsigned long nexttimeout = jiffies + NES_LONG_TIME;
451 struct iw_cm_id *cm_id;
452 struct nes_cm_node *cm_node;
453 struct nes_timer_entry *send_entry, *recv_entry;
454 struct list_head *list_core, *list_core_temp;
455 struct list_head *list_node, *list_node_temp;
456 struct nes_cm_core *cm_core = g_cm_core;
457 struct nes_qp *nesqp;
458 u32 settimer = 0;
459 int ret = NETDEV_TX_OK;
460 enum nes_cm_node_state last_state;
461
462 spin_lock_irqsave(&cm_core->ht_lock, flags);
463
464 list_for_each_safe(list_node, list_core_temp,
465 &cm_core->connected_nodes) {
466 cm_node = container_of(list_node, struct nes_cm_node, list);
467 add_ref_cm_node(cm_node);
468 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
469 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
470 list_for_each_safe(list_core, list_node_temp,
471 &cm_node->recv_list) {
472 recv_entry = container_of(list_core,
473 struct nes_timer_entry, list);
474 if (!recv_entry)
475 break;
476 if (time_after(recv_entry->timetosend, jiffies)) {
477 if (nexttimeout > recv_entry->timetosend ||
478 !settimer) {
479 nexttimeout = recv_entry->timetosend;
480 settimer = 1;
481 }
482 continue;
483 }
484 list_del(&recv_entry->list);
485 cm_id = cm_node->cm_id;
486 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
487 nesqp = (struct nes_qp *)recv_entry->skb;
488 spin_lock_irqsave(&nesqp->lock, qplockflags);
489 if (nesqp->cm_id) {
490 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
491 "refcount = %d: HIT A "
492 "NES_TIMER_TYPE_CLOSE with something "
493 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
494 atomic_read(&nesqp->refcount));
495 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
496 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
497 nesqp->ibqp_state = IB_QPS_ERR;
498 spin_unlock_irqrestore(&nesqp->lock,
499 qplockflags);
500 nes_cm_disconn(nesqp);
501 } else {
502 spin_unlock_irqrestore(&nesqp->lock,
503 qplockflags);
504 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
505 "refcount = %d: HIT A "
506 "NES_TIMER_TYPE_CLOSE with nothing "
507 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
508 atomic_read(&nesqp->refcount));
509 }
510 if (cm_id)
511 cm_id->rem_ref(cm_id);
512
513 kfree(recv_entry);
514 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
515 }
516 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
517
518 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
519 do {
520 send_entry = cm_node->send_entry;
521 if (!send_entry)
522 continue;
523 if (time_after(send_entry->timetosend, jiffies)) {
524 if (cm_node->state != NES_CM_STATE_TSA) {
525 if ((nexttimeout >
526 send_entry->timetosend) ||
527 !settimer) {
528 nexttimeout =
529 send_entry->timetosend;
530 settimer = 1;
531 continue;
532 }
533 } else {
534 free_retrans_entry(cm_node);
535 continue;
536 }
537 }
538
539 if ((cm_node->state == NES_CM_STATE_TSA) ||
540 (cm_node->state == NES_CM_STATE_CLOSED)) {
541 free_retrans_entry(cm_node);
542 continue;
543 }
544
545 if (!send_entry->retranscount ||
546 !send_entry->retrycount) {
547 cm_packets_dropped++;
548 last_state = cm_node->state;
549 cm_node->state = NES_CM_STATE_CLOSED;
550 free_retrans_entry(cm_node);
551 spin_unlock_irqrestore(
552 &cm_node->retrans_list_lock, flags);
553 if (last_state == NES_CM_STATE_SYN_RCVD)
554 rem_ref_cm_node(cm_core, cm_node);
555 else
556 create_event(cm_node,
557 NES_CM_EVENT_ABORTED);
558 spin_lock_irqsave(&cm_node->retrans_list_lock,
559 flags);
560 continue;
561 }
562 atomic_inc(&send_entry->skb->users);
563 cm_packets_retrans++;
564 nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
565 "for node %p, jiffies = %lu, time to send = "
566 "%lu, retranscount = %u, send_entry->seq_num = "
567 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
568 "0x%08X\n", send_entry, cm_node, jiffies,
569 send_entry->timetosend,
570 send_entry->retranscount,
571 send_entry->seq_num,
572 cm_node->tcp_cntxt.rem_ack_num);
573
574 spin_unlock_irqrestore(&cm_node->retrans_list_lock,
575 flags);
576 ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
577 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
578 if (ret != NETDEV_TX_OK) {
579 nes_debug(NES_DBG_CM, "rexmit failed for "
580 "node=%p\n", cm_node);
581 cm_packets_bounced++;
582 atomic_dec(&send_entry->skb->users);
583 send_entry->retrycount--;
584 nexttimeout = jiffies + NES_SHORT_TIME;
585 settimer = 1;
586 continue;
587 } else {
588 cm_packets_sent++;
589 }
590 nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
591 "%u, retry count = %u.\n",
592 send_entry->retranscount,
593 send_entry->retrycount);
594 if (send_entry->send_retrans) {
595 send_entry->retranscount--;
596 send_entry->timetosend = jiffies +
597 NES_RETRY_TIMEOUT;
598 if (nexttimeout > send_entry->timetosend ||
599 !settimer) {
600 nexttimeout = send_entry->timetosend;
601 settimer = 1;
602 }
603 } else {
604 int close_when_complete;
605 close_when_complete =
606 send_entry->close_when_complete;
607 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
608 cm_node, cm_node->state);
609 free_retrans_entry(cm_node);
610 if (close_when_complete)
611 rem_ref_cm_node(cm_node->cm_core,
612 cm_node);
613 }
614 } while (0);
615
616 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
617 rem_ref_cm_node(cm_node->cm_core, cm_node);
618 spin_lock_irqsave(&cm_core->ht_lock, flags);
619 if (ret != NETDEV_TX_OK) {
620 nes_debug(NES_DBG_CM, "rexmit failed for cm_node=%p\n",
621 cm_node);
622 break;
623 }
624 }
625 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
626
627 if (settimer) {
628 if (!timer_pending(&cm_core->tcp_timer)) {
629 cm_core->tcp_timer.expires = nexttimeout;
630 add_timer(&cm_core->tcp_timer);
631 }
632 }
633 }
634
635
636 /**
637 * send_syn
638 */
639 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
640 struct sk_buff *skb)
641 {
642 int ret;
643 int flags = SET_SYN;
644 char optionsbuffer[sizeof(struct option_mss) +
645 sizeof(struct option_windowscale) + sizeof(struct option_base) +
646 TCP_OPTIONS_PADDING];
647
648 int optionssize = 0;
649 /* Sending MSS option */
650 union all_known_options *options;
651
652 if (!cm_node)
653 return -EINVAL;
654
655 options = (union all_known_options *)&optionsbuffer[optionssize];
656 options->as_mss.optionnum = OPTION_NUMBER_MSS;
657 options->as_mss.length = sizeof(struct option_mss);
658 options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
659 optionssize += sizeof(struct option_mss);
660
661 options = (union all_known_options *)&optionsbuffer[optionssize];
662 options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
663 options->as_windowscale.length = sizeof(struct option_windowscale);
664 options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
665 optionssize += sizeof(struct option_windowscale);
666
667 if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
668 options = (union all_known_options *)&optionsbuffer[optionssize];
669 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
670 options->as_base.length = sizeof(struct option_base);
671 optionssize += sizeof(struct option_base);
672 /* we need the size to be a multiple of 4 */
673 options = (union all_known_options *)&optionsbuffer[optionssize];
674 options->as_end = 1;
675 optionssize += 1;
676 options = (union all_known_options *)&optionsbuffer[optionssize];
677 options->as_end = 1;
678 optionssize += 1;
679 }
680
681 options = (union all_known_options *)&optionsbuffer[optionssize];
682 options->as_end = OPTION_NUMBER_END;
683 optionssize += 1;
684
685 if (!skb)
686 skb = get_free_pkt(cm_node);
687 if (!skb) {
688 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
689 return -1;
690 }
691
692 if (sendack)
693 flags |= SET_ACK;
694
695 form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
696 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
697
698 return ret;
699 }
700
701
702 /**
703 * send_reset
704 */
705 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
706 {
707 int ret;
708 int flags = SET_RST | SET_ACK;
709
710 if (!skb)
711 skb = get_free_pkt(cm_node);
712 if (!skb) {
713 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
714 return -1;
715 }
716
717 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
718 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
719
720 return ret;
721 }
722
723
724 /**
725 * send_ack
726 */
727 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
728 {
729 int ret;
730
731 if (!skb)
732 skb = get_free_pkt(cm_node);
733
734 if (!skb) {
735 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
736 return -1;
737 }
738
739 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
740 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
741
742 return ret;
743 }
744
745
746 /**
747 * send_fin
748 */
749 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
750 {
751 int ret;
752
753 /* if we didn't get a frame get one */
754 if (!skb)
755 skb = get_free_pkt(cm_node);
756
757 if (!skb) {
758 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
759 return -1;
760 }
761
762 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
763 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
764
765 return ret;
766 }
767
768
769 /**
770 * get_free_pkt
771 */
772 static struct sk_buff *get_free_pkt(struct nes_cm_node *cm_node)
773 {
774 struct sk_buff *skb, *new_skb;
775
776 /* check to see if we need to repopulate the free tx pkt queue */
777 if (skb_queue_len(&cm_node->cm_core->tx_free_list) < NES_CM_FREE_PKT_LO_WATERMARK) {
778 while (skb_queue_len(&cm_node->cm_core->tx_free_list) <
779 cm_node->cm_core->free_tx_pkt_max) {
780 /* replace the frame we took, we won't get it back */
781 new_skb = dev_alloc_skb(cm_node->cm_core->mtu);
782 BUG_ON(!new_skb);
783 /* add a replacement frame to the free tx list head */
784 skb_queue_head(&cm_node->cm_core->tx_free_list, new_skb);
785 }
786 }
787
788 skb = skb_dequeue(&cm_node->cm_core->tx_free_list);
789
790 return skb;
791 }
792
793
794 /**
795 * make_hashkey - generate hash key from node tuple
796 */
797 static inline int make_hashkey(u16 loc_port, nes_addr_t loc_addr, u16 rem_port,
798 nes_addr_t rem_addr)
799 {
800 u32 hashkey = 0;
801
802 hashkey = loc_addr + rem_addr + loc_port + rem_port;
803 hashkey = (hashkey % NES_CM_HASHTABLE_SIZE);
804
805 return hashkey;
806 }
807
808
809 /**
810 * find_node - find a cm node that matches the reference cm node
811 */
812 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
813 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
814 {
815 unsigned long flags;
816 u32 hashkey;
817 struct list_head *hte;
818 struct nes_cm_node *cm_node;
819
820 /* make a hash index key for this packet */
821 hashkey = make_hashkey(loc_port, loc_addr, rem_port, rem_addr);
822
823 /* get a handle on the hte */
824 hte = &cm_core->connected_nodes;
825
826 nes_debug(NES_DBG_CM, "Searching for an owner node: " NIPQUAD_FMT ":%x from core %p->%p\n",
827 HIPQUAD(loc_addr), loc_port, cm_core, hte);
828
829 /* walk list and find cm_node associated with this session ID */
830 spin_lock_irqsave(&cm_core->ht_lock, flags);
831 list_for_each_entry(cm_node, hte, list) {
832 /* compare quad, return node handle if a match */
833 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
834 cm_node->loc_addr, cm_node->loc_port,
835 loc_addr, loc_port,
836 cm_node->rem_addr, cm_node->rem_port,
837 rem_addr, rem_port);
838 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
839 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
840 add_ref_cm_node(cm_node);
841 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
842 return cm_node;
843 }
844 }
845 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
846
847 /* no owner node */
848 return NULL;
849 }
850
851
852 /**
853 * find_listener - find a cm node listening on this addr-port pair
854 */
855 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
856 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
857 {
858 unsigned long flags;
859 struct nes_cm_listener *listen_node;
860
861 /* walk list and find cm_node associated with this session ID */
862 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
863 list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
864 /* compare node pair, return node handle if a match */
865 if (((listen_node->loc_addr == dst_addr) ||
866 listen_node->loc_addr == 0x00000000) &&
867 (listen_node->loc_port == dst_port) &&
868 (listener_state & listen_node->listener_state)) {
869 atomic_inc(&listen_node->ref_count);
870 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
871 return listen_node;
872 }
873 }
874 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
875
876 nes_debug(NES_DBG_CM, "Unable to find listener for " NIPQUAD_FMT ":%x\n",
877 HIPQUAD(dst_addr), dst_port);
878
879 /* no listener */
880 return NULL;
881 }
882
883
884 /**
885 * add_hte_node - add a cm node to the hash table
886 */
887 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
888 {
889 unsigned long flags;
890 u32 hashkey;
891 struct list_head *hte;
892
893 if (!cm_node || !cm_core)
894 return -EINVAL;
895
896 nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
897 cm_node);
898
899 /* first, make an index into our hash table */
900 hashkey = make_hashkey(cm_node->loc_port, cm_node->loc_addr,
901 cm_node->rem_port, cm_node->rem_addr);
902 cm_node->hashkey = hashkey;
903
904 spin_lock_irqsave(&cm_core->ht_lock, flags);
905
906 /* get a handle on the hash table element (list head for this slot) */
907 hte = &cm_core->connected_nodes;
908 list_add_tail(&cm_node->list, hte);
909 atomic_inc(&cm_core->ht_node_cnt);
910
911 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
912
913 return 0;
914 }
915
916
917 /**
918 * mini_cm_dec_refcnt_listen
919 */
920 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
921 struct nes_cm_listener *listener, int free_hanging_nodes)
922 {
923 int ret = 1;
924 unsigned long flags;
925 struct list_head *list_pos = NULL;
926 struct list_head *list_temp = NULL;
927 struct nes_cm_node *cm_node = NULL;
928
929 nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
930 "refcnt=%d\n", listener, free_hanging_nodes,
931 atomic_read(&listener->ref_count));
932 /* free non-accelerated child nodes for this listener */
933 if (free_hanging_nodes) {
934 spin_lock_irqsave(&cm_core->ht_lock, flags);
935 list_for_each_safe(list_pos, list_temp,
936 &g_cm_core->connected_nodes) {
937 cm_node = container_of(list_pos, struct nes_cm_node,
938 list);
939 if ((cm_node->listener == listener) &&
940 (!cm_node->accelerated)) {
941 cleanup_retrans_entry(cm_node);
942 spin_unlock_irqrestore(&cm_core->ht_lock,
943 flags);
944 send_reset(cm_node, NULL);
945 spin_lock_irqsave(&cm_core->ht_lock, flags);
946 }
947 }
948 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
949 }
950 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
951 if (!atomic_dec_return(&listener->ref_count)) {
952 list_del(&listener->list);
953
954 /* decrement our listen node count */
955 atomic_dec(&cm_core->listen_node_cnt);
956
957 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
958
959 if (listener->nesvnic) {
960 nes_manage_apbvt(listener->nesvnic, listener->loc_port,
961 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
962 }
963
964 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
965
966 kfree(listener);
967 listener = NULL;
968 ret = 0;
969 cm_listens_destroyed++;
970 } else {
971 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
972 }
973 if (listener) {
974 if (atomic_read(&listener->pend_accepts_cnt) > 0)
975 nes_debug(NES_DBG_CM, "destroying listener (%p)"
976 " with non-zero pending accepts=%u\n",
977 listener, atomic_read(&listener->pend_accepts_cnt));
978 }
979
980 return ret;
981 }
982
983
984 /**
985 * mini_cm_del_listen
986 */
987 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
988 struct nes_cm_listener *listener)
989 {
990 listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
991 listener->cm_id = NULL; /* going to be destroyed pretty soon */
992 return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
993 }
994
995
996 /**
997 * mini_cm_accelerated
998 */
999 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1000 struct nes_cm_node *cm_node)
1001 {
1002 u32 was_timer_set;
1003 cm_node->accelerated = 1;
1004
1005 if (cm_node->accept_pend) {
1006 BUG_ON(!cm_node->listener);
1007 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1008 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1009 }
1010
1011 was_timer_set = timer_pending(&cm_core->tcp_timer);
1012 if (!was_timer_set) {
1013 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1014 add_timer(&cm_core->tcp_timer);
1015 }
1016
1017 return 0;
1018 }
1019
1020
1021 /**
1022 * nes_addr_resolve_neigh
1023 */
1024 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
1025 {
1026 struct rtable *rt;
1027 struct flowi fl;
1028 struct neighbour *neigh;
1029 int rc = -1;
1030 DECLARE_MAC_BUF(mac);
1031
1032 memset(&fl, 0, sizeof fl);
1033 fl.nl_u.ip4_u.daddr = htonl(dst_ip);
1034 if (ip_route_output_key(&init_net, &rt, &fl)) {
1035 printk("%s: ip_route_output_key failed for 0x%08X\n",
1036 __func__, dst_ip);
1037 return rc;
1038 }
1039
1040 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, nesvnic->netdev);
1041 if (neigh) {
1042 if (neigh->nud_state & NUD_VALID) {
1043 nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1044 " is %s, Gateway is 0x%08X \n", dst_ip,
1045 print_mac(mac, neigh->ha), ntohl(rt->rt_gateway));
1046 nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1047 dst_ip, NES_ARP_ADD);
1048 rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1049 NES_ARP_RESOLVE);
1050 }
1051 neigh_release(neigh);
1052 }
1053
1054 if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
1055 neigh_event_send(rt->u.dst.neighbour, NULL);
1056
1057 ip_rt_put(rt);
1058 return rc;
1059 }
1060
1061
1062 /**
1063 * make_cm_node - create a new instance of a cm node
1064 */
1065 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1066 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1067 struct nes_cm_listener *listener)
1068 {
1069 struct nes_cm_node *cm_node;
1070 struct timespec ts;
1071 int arpindex = 0;
1072 struct nes_device *nesdev;
1073 struct nes_adapter *nesadapter;
1074 DECLARE_MAC_BUF(mac);
1075
1076 /* create an hte and cm_node for this instance */
1077 cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1078 if (!cm_node)
1079 return NULL;
1080
1081 /* set our node specific transport info */
1082 cm_node->loc_addr = cm_info->loc_addr;
1083 cm_node->rem_addr = cm_info->rem_addr;
1084 cm_node->loc_port = cm_info->loc_port;
1085 cm_node->rem_port = cm_info->rem_port;
1086 cm_node->send_write0 = send_first;
1087 nes_debug(NES_DBG_CM, "Make node addresses : loc = " NIPQUAD_FMT
1088 ":%x, rem = " NIPQUAD_FMT ":%x\n",
1089 HIPQUAD(cm_node->loc_addr), cm_node->loc_port,
1090 HIPQUAD(cm_node->rem_addr), cm_node->rem_port);
1091 cm_node->listener = listener;
1092 cm_node->netdev = nesvnic->netdev;
1093 cm_node->cm_id = cm_info->cm_id;
1094 memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1095
1096 nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1097 cm_node->cm_id);
1098
1099 spin_lock_init(&cm_node->retrans_list_lock);
1100 INIT_LIST_HEAD(&cm_node->recv_list);
1101 spin_lock_init(&cm_node->recv_list_lock);
1102
1103 cm_node->loopbackpartner = NULL;
1104 atomic_set(&cm_node->ref_count, 1);
1105 /* associate our parent CM core */
1106 cm_node->cm_core = cm_core;
1107 cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1108 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1109 cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1110 NES_CM_DEFAULT_RCV_WND_SCALE;
1111 ts = current_kernel_time();
1112 cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1113 cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1114 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1115 cm_node->tcp_cntxt.rcv_nxt = 0;
1116 /* get a unique session ID , add thread_id to an upcounter to handle race */
1117 atomic_inc(&cm_core->node_cnt);
1118 cm_node->conn_type = cm_info->conn_type;
1119 cm_node->apbvt_set = 0;
1120 cm_node->accept_pend = 0;
1121
1122 cm_node->nesvnic = nesvnic;
1123 /* get some device handles, for arp lookup */
1124 nesdev = nesvnic->nesdev;
1125 nesadapter = nesdev->nesadapter;
1126
1127 cm_node->loopbackpartner = NULL;
1128 /* get the mac addr for the remote node */
1129 arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1130 if (arpindex < 0) {
1131 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
1132 if (arpindex < 0) {
1133 kfree(cm_node);
1134 return NULL;
1135 }
1136 }
1137
1138 /* copy the mac addr to node context */
1139 memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1140 nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %s\n",
1141 print_mac(mac, cm_node->rem_mac));
1142
1143 add_hte_node(cm_core, cm_node);
1144 atomic_inc(&cm_nodes_created);
1145
1146 return cm_node;
1147 }
1148
1149
1150 /**
1151 * add_ref_cm_node - destroy an instance of a cm node
1152 */
1153 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1154 {
1155 atomic_inc(&cm_node->ref_count);
1156 return 0;
1157 }
1158
1159
1160 /**
1161 * rem_ref_cm_node - destroy an instance of a cm node
1162 */
1163 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1164 struct nes_cm_node *cm_node)
1165 {
1166 unsigned long flags, qplockflags;
1167 struct nes_timer_entry *recv_entry;
1168 struct iw_cm_id *cm_id;
1169 struct list_head *list_core, *list_node_temp;
1170 struct nes_qp *nesqp;
1171
1172 if (!cm_node)
1173 return -EINVAL;
1174
1175 spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1176 if (atomic_dec_return(&cm_node->ref_count)) {
1177 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1178 return 0;
1179 }
1180 list_del(&cm_node->list);
1181 atomic_dec(&cm_core->ht_node_cnt);
1182 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1183
1184 /* if the node is destroyed before connection was accelerated */
1185 if (!cm_node->accelerated && cm_node->accept_pend) {
1186 BUG_ON(!cm_node->listener);
1187 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1188 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1189 }
1190 BUG_ON(cm_node->send_entry);
1191 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1192 list_for_each_safe(list_core, list_node_temp, &cm_node->recv_list) {
1193 recv_entry = container_of(list_core, struct nes_timer_entry,
1194 list);
1195 list_del(&recv_entry->list);
1196 cm_id = cm_node->cm_id;
1197 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1198 nesqp = (struct nes_qp *)recv_entry->skb;
1199 spin_lock_irqsave(&nesqp->lock, qplockflags);
1200 if (nesqp->cm_id) {
1201 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: HIT A "
1202 "NES_TIMER_TYPE_CLOSE with something to do!\n",
1203 nesqp->hwqp.qp_id, cm_id);
1204 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
1205 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
1206 nesqp->ibqp_state = IB_QPS_ERR;
1207 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1208 nes_cm_disconn(nesqp);
1209 } else {
1210 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
1211 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p: HIT A "
1212 "NES_TIMER_TYPE_CLOSE with nothing to do!\n",
1213 nesqp->hwqp.qp_id, cm_id);
1214 }
1215 cm_id->rem_ref(cm_id);
1216
1217 kfree(recv_entry);
1218 spin_lock_irqsave(&cm_node->recv_list_lock, flags);
1219 }
1220 spin_unlock_irqrestore(&cm_node->recv_list_lock, flags);
1221
1222 if (cm_node->listener) {
1223 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1224 } else {
1225 if (cm_node->apbvt_set && cm_node->nesvnic) {
1226 nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1227 PCI_FUNC(
1228 cm_node->nesvnic->nesdev->pcidev->devfn),
1229 NES_MANAGE_APBVT_DEL);
1230 }
1231 }
1232
1233 atomic_dec(&cm_core->node_cnt);
1234 atomic_inc(&cm_nodes_destroyed);
1235 nesqp = cm_node->nesqp;
1236 if (nesqp) {
1237 nesqp->cm_node = NULL;
1238 nes_rem_ref(&nesqp->ibqp);
1239 cm_node->nesqp = NULL;
1240 }
1241
1242 cm_node->freed = 1;
1243 kfree(cm_node);
1244 return 0;
1245 }
1246
1247 /**
1248 * process_options
1249 */
1250 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1251 u32 optionsize, u32 syn_packet)
1252 {
1253 u32 tmp;
1254 u32 offset = 0;
1255 union all_known_options *all_options;
1256 char got_mss_option = 0;
1257
1258 while (offset < optionsize) {
1259 all_options = (union all_known_options *)(optionsloc + offset);
1260 switch (all_options->as_base.optionnum) {
1261 case OPTION_NUMBER_END:
1262 offset = optionsize;
1263 break;
1264 case OPTION_NUMBER_NONE:
1265 offset += 1;
1266 continue;
1267 case OPTION_NUMBER_MSS:
1268 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1269 "Size: %d\n", __func__,
1270 all_options->as_mss.length, offset, optionsize);
1271 got_mss_option = 1;
1272 if (all_options->as_mss.length != 4) {
1273 return 1;
1274 } else {
1275 tmp = ntohs(all_options->as_mss.mss);
1276 if (tmp > 0 && tmp <
1277 cm_node->tcp_cntxt.mss)
1278 cm_node->tcp_cntxt.mss = tmp;
1279 }
1280 break;
1281 case OPTION_NUMBER_WINDOW_SCALE:
1282 cm_node->tcp_cntxt.snd_wscale =
1283 all_options->as_windowscale.shiftcount;
1284 break;
1285 case OPTION_NUMBER_WRITE0:
1286 cm_node->send_write0 = 1;
1287 break;
1288 default:
1289 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1290 all_options->as_base.optionnum);
1291 break;
1292 }
1293 offset += all_options->as_base.length;
1294 }
1295 if ((!got_mss_option) && (syn_packet))
1296 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1297 return 0;
1298 }
1299
1300 static void drop_packet(struct sk_buff *skb)
1301 {
1302 atomic_inc(&cm_accel_dropped_pkts);
1303 dev_kfree_skb_any(skb);
1304 }
1305
1306 static void handle_fin_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1307 struct tcphdr *tcph)
1308 {
1309 atomic_inc(&cm_resets_recvd);
1310 nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1311 "refcnt=%d\n", cm_node, cm_node->state,
1312 atomic_read(&cm_node->ref_count));
1313 cm_node->tcp_cntxt.rcv_nxt++;
1314 cleanup_retrans_entry(cm_node);
1315 switch (cm_node->state) {
1316 case NES_CM_STATE_SYN_RCVD:
1317 case NES_CM_STATE_SYN_SENT:
1318 case NES_CM_STATE_ESTABLISHED:
1319 case NES_CM_STATE_MPAREQ_SENT:
1320 cm_node->state = NES_CM_STATE_LAST_ACK;
1321 send_fin(cm_node, skb);
1322 break;
1323 case NES_CM_STATE_FIN_WAIT1:
1324 cm_node->state = NES_CM_STATE_CLOSING;
1325 send_ack(cm_node, skb);
1326 break;
1327 case NES_CM_STATE_FIN_WAIT2:
1328 cm_node->state = NES_CM_STATE_TIME_WAIT;
1329 send_ack(cm_node, skb);
1330 cm_node->state = NES_CM_STATE_CLOSED;
1331 break;
1332 case NES_CM_STATE_TSA:
1333 default:
1334 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1335 cm_node, cm_node->state);
1336 drop_packet(skb);
1337 break;
1338 }
1339 }
1340
1341
1342 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1343 struct tcphdr *tcph)
1344 {
1345
1346 int reset = 0; /* whether to send reset in case of err.. */
1347 atomic_inc(&cm_resets_recvd);
1348 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1349 " refcnt=%d\n", cm_node, cm_node->state,
1350 atomic_read(&cm_node->ref_count));
1351 cleanup_retrans_entry(cm_node);
1352 switch (cm_node->state) {
1353 case NES_CM_STATE_SYN_SENT:
1354 case NES_CM_STATE_MPAREQ_SENT:
1355 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1356 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1357 cm_node->listener, cm_node->state);
1358 active_open_err(cm_node, skb, reset);
1359 break;
1360 /* For PASSIVE open states, remove the cm_node event */
1361 case NES_CM_STATE_ESTABLISHED:
1362 case NES_CM_STATE_SYN_RCVD:
1363 case NES_CM_STATE_LISTENING:
1364 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1365 passive_open_err(cm_node, skb, reset);
1366 break;
1367 case NES_CM_STATE_TSA:
1368 default:
1369 break;
1370 }
1371 }
1372
1373 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb,
1374 enum nes_cm_event_type type)
1375 {
1376
1377 int ret;
1378 int datasize = skb->len;
1379 u8 *dataloc = skb->data;
1380 ret = parse_mpa(cm_node, dataloc, datasize);
1381 if (ret < 0) {
1382 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1383 if (type == NES_CM_EVENT_CONNECTED) {
1384 nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1385 "cm_node=%p listener=%p state=%d\n", __func__,
1386 __LINE__, cm_node, cm_node->listener,
1387 cm_node->state);
1388 active_open_err(cm_node, skb, 1);
1389 } else {
1390 passive_open_err(cm_node, skb, 1);
1391 }
1392 } else {
1393 cleanup_retrans_entry(cm_node);
1394 dev_kfree_skb_any(skb);
1395 if (type == NES_CM_EVENT_CONNECTED)
1396 cm_node->state = NES_CM_STATE_TSA;
1397 create_event(cm_node, type);
1398
1399 }
1400 return ;
1401 }
1402
1403 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1404 {
1405 switch (cm_node->state) {
1406 case NES_CM_STATE_SYN_SENT:
1407 case NES_CM_STATE_MPAREQ_SENT:
1408 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1409 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1410 cm_node->listener, cm_node->state);
1411 active_open_err(cm_node, skb, 1);
1412 break;
1413 case NES_CM_STATE_ESTABLISHED:
1414 case NES_CM_STATE_SYN_RCVD:
1415 passive_open_err(cm_node, skb, 1);
1416 break;
1417 case NES_CM_STATE_TSA:
1418 default:
1419 drop_packet(skb);
1420 }
1421 }
1422
1423 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1424 struct sk_buff *skb)
1425 {
1426 int err;
1427
1428 err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num))? 0 : 1;
1429 if (err)
1430 active_open_err(cm_node, skb, 1);
1431
1432 return err;
1433 }
1434
1435 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1436 struct sk_buff *skb)
1437 {
1438 int err = 0;
1439 u32 seq;
1440 u32 ack_seq;
1441 u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1442 u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1443 u32 rcv_wnd;
1444 seq = ntohl(tcph->seq);
1445 ack_seq = ntohl(tcph->ack_seq);
1446 rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1447 if (ack_seq != loc_seq_num)
1448 err = 1;
1449 else if ((seq + rcv_wnd) < rcv_nxt)
1450 err = 1;
1451 if (err) {
1452 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1453 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1454 cm_node->listener, cm_node->state);
1455 indicate_pkt_err(cm_node, skb);
1456 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1457 "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1458 rcv_wnd);
1459 }
1460 return err;
1461 }
1462
1463 /*
1464 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1465 * is created with a listener or it may comein as rexmitted packet which in
1466 * that case will be just dropped.
1467 */
1468
1469 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1470 struct tcphdr *tcph)
1471 {
1472 int ret;
1473 u32 inc_sequence;
1474 int optionsize;
1475
1476 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1477 skb_pull(skb, tcph->doff << 2);
1478 inc_sequence = ntohl(tcph->seq);
1479
1480 switch (cm_node->state) {
1481 case NES_CM_STATE_SYN_SENT:
1482 case NES_CM_STATE_MPAREQ_SENT:
1483 /* Rcvd syn on active open connection*/
1484 active_open_err(cm_node, skb, 1);
1485 break;
1486 case NES_CM_STATE_LISTENING:
1487 /* Passive OPEN */
1488 cm_node->accept_pend = 1;
1489 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1490 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1491 cm_node->listener->backlog) {
1492 nes_debug(NES_DBG_CM, "drop syn due to backlog "
1493 "pressure \n");
1494 cm_backlog_drops++;
1495 passive_open_err(cm_node, skb, 0);
1496 break;
1497 }
1498 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1499 1);
1500 if (ret) {
1501 passive_open_err(cm_node, skb, 0);
1502 /* drop pkt */
1503 break;
1504 }
1505 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1506 BUG_ON(cm_node->send_entry);
1507 cm_node->state = NES_CM_STATE_SYN_RCVD;
1508 send_syn(cm_node, 1, skb);
1509 break;
1510 case NES_CM_STATE_TSA:
1511 case NES_CM_STATE_ESTABLISHED:
1512 case NES_CM_STATE_FIN_WAIT1:
1513 case NES_CM_STATE_FIN_WAIT2:
1514 case NES_CM_STATE_MPAREQ_RCVD:
1515 case NES_CM_STATE_LAST_ACK:
1516 case NES_CM_STATE_CLOSING:
1517 case NES_CM_STATE_UNKNOWN:
1518 case NES_CM_STATE_CLOSED:
1519 default:
1520 drop_packet(skb);
1521 break;
1522 }
1523 }
1524
1525 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1526 struct tcphdr *tcph)
1527 {
1528
1529 int ret;
1530 u32 inc_sequence;
1531 int optionsize;
1532
1533 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1534 skb_pull(skb, tcph->doff << 2);
1535 inc_sequence = ntohl(tcph->seq);
1536 switch (cm_node->state) {
1537 case NES_CM_STATE_SYN_SENT:
1538 /* active open */
1539 if (check_syn(cm_node, tcph, skb))
1540 return;
1541 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1542 /* setup options */
1543 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1544 if (ret) {
1545 nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1546 cm_node);
1547 break;
1548 }
1549 cleanup_retrans_entry(cm_node);
1550 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1551 send_mpa_request(cm_node, skb);
1552 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1553 break;
1554 case NES_CM_STATE_MPAREQ_RCVD:
1555 /* passive open, so should not be here */
1556 passive_open_err(cm_node, skb, 1);
1557 break;
1558 case NES_CM_STATE_ESTABLISHED:
1559 case NES_CM_STATE_FIN_WAIT1:
1560 case NES_CM_STATE_FIN_WAIT2:
1561 case NES_CM_STATE_LAST_ACK:
1562 case NES_CM_STATE_TSA:
1563 case NES_CM_STATE_CLOSING:
1564 case NES_CM_STATE_UNKNOWN:
1565 case NES_CM_STATE_CLOSED:
1566 case NES_CM_STATE_MPAREQ_SENT:
1567 default:
1568 drop_packet(skb);
1569 break;
1570 }
1571 }
1572
1573 static void handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1574 struct tcphdr *tcph)
1575 {
1576 int datasize = 0;
1577 u32 inc_sequence;
1578 u32 rem_seq_ack;
1579 u32 rem_seq;
1580 if (check_seq(cm_node, tcph, skb))
1581 return;
1582
1583 skb_pull(skb, tcph->doff << 2);
1584 inc_sequence = ntohl(tcph->seq);
1585 rem_seq = ntohl(tcph->seq);
1586 rem_seq_ack = ntohl(tcph->ack_seq);
1587 datasize = skb->len;
1588
1589 switch (cm_node->state) {
1590 case NES_CM_STATE_SYN_RCVD:
1591 /* Passive OPEN */
1592 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1593 cm_node->state = NES_CM_STATE_ESTABLISHED;
1594 if (datasize) {
1595 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1596 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1597 handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_MPA_REQ);
1598 } else { /* rcvd ACK only */
1599 dev_kfree_skb_any(skb);
1600 cleanup_retrans_entry(cm_node);
1601 }
1602 break;
1603 case NES_CM_STATE_ESTABLISHED:
1604 /* Passive OPEN */
1605 /* We expect mpa frame to be received only */
1606 if (datasize) {
1607 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1608 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1609 handle_rcv_mpa(cm_node, skb,
1610 NES_CM_EVENT_MPA_REQ);
1611 } else
1612 drop_packet(skb);
1613 break;
1614 case NES_CM_STATE_MPAREQ_SENT:
1615 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1616 if (datasize) {
1617 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1618 handle_rcv_mpa(cm_node, skb, NES_CM_EVENT_CONNECTED);
1619 } else { /* Could be just an ack pkt.. */
1620 cleanup_retrans_entry(cm_node);
1621 dev_kfree_skb_any(skb);
1622 }
1623 break;
1624 case NES_CM_STATE_FIN_WAIT1:
1625 case NES_CM_STATE_SYN_SENT:
1626 case NES_CM_STATE_FIN_WAIT2:
1627 case NES_CM_STATE_TSA:
1628 case NES_CM_STATE_CLOSED:
1629 case NES_CM_STATE_MPAREQ_RCVD:
1630 case NES_CM_STATE_LAST_ACK:
1631 case NES_CM_STATE_CLOSING:
1632 case NES_CM_STATE_UNKNOWN:
1633 default:
1634 drop_packet(skb);
1635 break;
1636 }
1637 }
1638
1639
1640
1641 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1642 struct sk_buff *skb, int optionsize, int passive)
1643 {
1644 u8 *optionsloc = (u8 *)&tcph[1];
1645 if (optionsize) {
1646 if (process_options(cm_node, optionsloc, optionsize,
1647 (u32)tcph->syn)) {
1648 nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
1649 __func__, cm_node);
1650 if (passive)
1651 passive_open_err(cm_node, skb, 0);
1652 else
1653 active_open_err(cm_node, skb, 0);
1654 return 1;
1655 }
1656 }
1657
1658 cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
1659 cm_node->tcp_cntxt.snd_wscale;
1660
1661 if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
1662 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
1663 return 0;
1664 }
1665
1666 /*
1667 * active_open_err() will send reset() if flag set..
1668 * It will also send ABORT event.
1669 */
1670
1671 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1672 int reset)
1673 {
1674 cleanup_retrans_entry(cm_node);
1675 if (reset) {
1676 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
1677 "state=%d\n", cm_node, cm_node->state);
1678 add_ref_cm_node(cm_node);
1679 send_reset(cm_node, skb);
1680 } else
1681 dev_kfree_skb_any(skb);
1682
1683 cm_node->state = NES_CM_STATE_CLOSED;
1684 create_event(cm_node, NES_CM_EVENT_ABORTED);
1685 }
1686
1687 /*
1688 * passive_open_err() will either do a reset() or will free up the skb and
1689 * remove the cm_node.
1690 */
1691
1692 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
1693 int reset)
1694 {
1695 cleanup_retrans_entry(cm_node);
1696 cm_node->state = NES_CM_STATE_CLOSED;
1697 if (reset) {
1698 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
1699 "cm_node=%p state =%d\n", cm_node, cm_node->state);
1700 send_reset(cm_node, skb);
1701 } else {
1702 dev_kfree_skb_any(skb);
1703 rem_ref_cm_node(cm_node->cm_core, cm_node);
1704 }
1705 }
1706
1707 /*
1708 * free_retrans_entry() routines assumes that the retrans_list_lock has
1709 * been acquired before calling.
1710 */
1711 static void free_retrans_entry(struct nes_cm_node *cm_node)
1712 {
1713 struct nes_timer_entry *send_entry;
1714 send_entry = cm_node->send_entry;
1715 if (send_entry) {
1716 cm_node->send_entry = NULL;
1717 dev_kfree_skb_any(send_entry->skb);
1718 kfree(send_entry);
1719 rem_ref_cm_node(cm_node->cm_core, cm_node);
1720 }
1721 }
1722
1723 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
1724 {
1725 unsigned long flags;
1726
1727 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
1728 free_retrans_entry(cm_node);
1729 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
1730 }
1731
1732 /**
1733 * process_packet
1734 * Returns skb if to be freed, else it will return NULL if already used..
1735 */
1736 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
1737 struct nes_cm_core *cm_core)
1738 {
1739 enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
1740 struct tcphdr *tcph = tcp_hdr(skb);
1741 skb_pull(skb, ip_hdr(skb)->ihl << 2);
1742
1743 nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
1744 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
1745 tcph->ack, tcph->rst, tcph->fin);
1746
1747 if (tcph->rst)
1748 pkt_type = NES_PKT_TYPE_RST;
1749 else if (tcph->syn) {
1750 pkt_type = NES_PKT_TYPE_SYN;
1751 if (tcph->ack)
1752 pkt_type = NES_PKT_TYPE_SYNACK;
1753 } else if (tcph->fin)
1754 pkt_type = NES_PKT_TYPE_FIN;
1755 else if (tcph->ack)
1756 pkt_type = NES_PKT_TYPE_ACK;
1757
1758 switch (pkt_type) {
1759 case NES_PKT_TYPE_SYN:
1760 handle_syn_pkt(cm_node, skb, tcph);
1761 break;
1762 case NES_PKT_TYPE_SYNACK:
1763 handle_synack_pkt(cm_node, skb, tcph);
1764 break;
1765 case NES_PKT_TYPE_ACK:
1766 handle_ack_pkt(cm_node, skb, tcph);
1767 break;
1768 case NES_PKT_TYPE_RST:
1769 handle_rst_pkt(cm_node, skb, tcph);
1770 break;
1771 case NES_PKT_TYPE_FIN:
1772 handle_fin_pkt(cm_node, skb, tcph);
1773 break;
1774 default:
1775 drop_packet(skb);
1776 break;
1777 }
1778 }
1779
1780 /**
1781 * mini_cm_listen - create a listen node with params
1782 */
1783 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
1784 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
1785 {
1786 struct nes_cm_listener *listener;
1787 unsigned long flags;
1788
1789 nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
1790 cm_info->loc_addr, cm_info->loc_port);
1791
1792 /* cannot have multiple matching listeners */
1793 listener = find_listener(cm_core, htonl(cm_info->loc_addr),
1794 htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
1795 if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
1796 /* find automatically incs ref count ??? */
1797 atomic_dec(&listener->ref_count);
1798 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
1799 return NULL;
1800 }
1801
1802 if (!listener) {
1803 /* create a CM listen node (1/2 node to compare incoming traffic to) */
1804 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
1805 if (!listener) {
1806 nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
1807 return NULL;
1808 }
1809
1810 listener->loc_addr = htonl(cm_info->loc_addr);
1811 listener->loc_port = htons(cm_info->loc_port);
1812 listener->reused_node = 0;
1813
1814 atomic_set(&listener->ref_count, 1);
1815 }
1816 /* pasive case */
1817 /* find already inc'ed the ref count */
1818 else {
1819 listener->reused_node = 1;
1820 }
1821
1822 listener->cm_id = cm_info->cm_id;
1823 atomic_set(&listener->pend_accepts_cnt, 0);
1824 listener->cm_core = cm_core;
1825 listener->nesvnic = nesvnic;
1826 atomic_inc(&cm_core->node_cnt);
1827
1828 listener->conn_type = cm_info->conn_type;
1829 listener->backlog = cm_info->backlog;
1830 listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
1831
1832 if (!listener->reused_node) {
1833 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1834 list_add(&listener->list, &cm_core->listen_list.list);
1835 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1836 atomic_inc(&cm_core->listen_node_cnt);
1837 }
1838
1839 nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
1840 " listener = %p, backlog = %d, cm_id = %p.\n",
1841 cm_info->loc_addr, cm_info->loc_port,
1842 listener, listener->backlog, listener->cm_id);
1843
1844 return listener;
1845 }
1846
1847
1848 /**
1849 * mini_cm_connect - make a connection node with params
1850 */
1851 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
1852 struct nes_vnic *nesvnic, u16 private_data_len,
1853 void *private_data, struct nes_cm_info *cm_info)
1854 {
1855 int ret = 0;
1856 struct nes_cm_node *cm_node;
1857 struct nes_cm_listener *loopbackremotelistener;
1858 struct nes_cm_node *loopbackremotenode;
1859 struct nes_cm_info loopback_cm_info;
1860 u16 mpa_frame_size = sizeof(struct ietf_mpa_frame) + private_data_len;
1861 struct ietf_mpa_frame *mpa_frame = NULL;
1862
1863 /* create a CM connection node */
1864 cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
1865 if (!cm_node)
1866 return NULL;
1867 mpa_frame = &cm_node->mpa_frame;
1868 strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
1869 mpa_frame->flags = IETF_MPA_FLAGS_CRC;
1870 mpa_frame->rev = IETF_MPA_VERSION;
1871 mpa_frame->priv_data_len = htons(private_data_len);
1872
1873 /* set our node side to client (active) side */
1874 cm_node->tcp_cntxt.client = 1;
1875 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1876
1877 if (cm_info->loc_addr == cm_info->rem_addr) {
1878 loopbackremotelistener = find_listener(cm_core,
1879 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
1880 NES_CM_LISTENER_ACTIVE_STATE);
1881 if (loopbackremotelistener == NULL) {
1882 create_event(cm_node, NES_CM_EVENT_ABORTED);
1883 } else {
1884 atomic_inc(&cm_loopbacks);
1885 loopback_cm_info = *cm_info;
1886 loopback_cm_info.loc_port = cm_info->rem_port;
1887 loopback_cm_info.rem_port = cm_info->loc_port;
1888 loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
1889 loopbackremotenode = make_cm_node(cm_core, nesvnic,
1890 &loopback_cm_info, loopbackremotelistener);
1891 loopbackremotenode->loopbackpartner = cm_node;
1892 loopbackremotenode->tcp_cntxt.rcv_wscale =
1893 NES_CM_DEFAULT_RCV_WND_SCALE;
1894 cm_node->loopbackpartner = loopbackremotenode;
1895 memcpy(loopbackremotenode->mpa_frame_buf, private_data,
1896 private_data_len);
1897 loopbackremotenode->mpa_frame_size = private_data_len;
1898
1899 /* we are done handling this state. */
1900 /* set node to a TSA state */
1901 cm_node->state = NES_CM_STATE_TSA;
1902 cm_node->tcp_cntxt.rcv_nxt =
1903 loopbackremotenode->tcp_cntxt.loc_seq_num;
1904 loopbackremotenode->tcp_cntxt.rcv_nxt =
1905 cm_node->tcp_cntxt.loc_seq_num;
1906 cm_node->tcp_cntxt.max_snd_wnd =
1907 loopbackremotenode->tcp_cntxt.rcv_wnd;
1908 loopbackremotenode->tcp_cntxt.max_snd_wnd =
1909 cm_node->tcp_cntxt.rcv_wnd;
1910 cm_node->tcp_cntxt.snd_wnd =
1911 loopbackremotenode->tcp_cntxt.rcv_wnd;
1912 loopbackremotenode->tcp_cntxt.snd_wnd =
1913 cm_node->tcp_cntxt.rcv_wnd;
1914 cm_node->tcp_cntxt.snd_wscale =
1915 loopbackremotenode->tcp_cntxt.rcv_wscale;
1916 loopbackremotenode->tcp_cntxt.snd_wscale =
1917 cm_node->tcp_cntxt.rcv_wscale;
1918
1919 create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
1920 }
1921 return cm_node;
1922 }
1923
1924 /* set our node side to client (active) side */
1925 cm_node->tcp_cntxt.client = 1;
1926 /* init our MPA frame ptr */
1927 memcpy(mpa_frame->priv_data, private_data, private_data_len);
1928
1929 cm_node->mpa_frame_size = mpa_frame_size;
1930
1931 /* send a syn and goto syn sent state */
1932 cm_node->state = NES_CM_STATE_SYN_SENT;
1933 ret = send_syn(cm_node, 0, NULL);
1934
1935 if (ret) {
1936 /* error in sending the syn free up the cm_node struct */
1937 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
1938 "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
1939 cm_node->rem_addr, cm_node->rem_port, cm_node,
1940 cm_node->cm_id);
1941 rem_ref_cm_node(cm_node->cm_core, cm_node);
1942 cm_node = NULL;
1943 }
1944
1945 if (cm_node)
1946 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
1947 "port=0x%04x, cm_node=%p, cm_id = %p.\n",
1948 cm_node->rem_addr, cm_node->rem_port, cm_node,
1949 cm_node->cm_id);
1950
1951 return cm_node;
1952 }
1953
1954
1955 /**
1956 * mini_cm_accept - accept a connection
1957 * This function is never called
1958 */
1959 static int mini_cm_accept(struct nes_cm_core *cm_core,
1960 struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1961 {
1962 return 0;
1963 }
1964
1965
1966 /**
1967 * mini_cm_reject - reject and teardown a connection
1968 */
1969 static int mini_cm_reject(struct nes_cm_core *cm_core,
1970 struct ietf_mpa_frame *mpa_frame, struct nes_cm_node *cm_node)
1971 {
1972 int ret = 0;
1973
1974 nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
1975 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
1976
1977 if (cm_node->tcp_cntxt.client)
1978 return ret;
1979 cleanup_retrans_entry(cm_node);
1980 cm_node->state = NES_CM_STATE_CLOSED;
1981
1982 ret = send_reset(cm_node, NULL);
1983 return ret;
1984 }
1985
1986
1987 /**
1988 * mini_cm_close
1989 */
1990 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1991 {
1992 int ret = 0;
1993
1994 if (!cm_core || !cm_node)
1995 return -EINVAL;
1996
1997 switch (cm_node->state) {
1998 case NES_CM_STATE_SYN_RCVD:
1999 case NES_CM_STATE_SYN_SENT:
2000 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2001 case NES_CM_STATE_ESTABLISHED:
2002 case NES_CM_STATE_ACCEPTING:
2003 case NES_CM_STATE_MPAREQ_SENT:
2004 case NES_CM_STATE_MPAREQ_RCVD:
2005 cleanup_retrans_entry(cm_node);
2006 send_reset(cm_node, NULL);
2007 break;
2008 case NES_CM_STATE_CLOSE_WAIT:
2009 cm_node->state = NES_CM_STATE_LAST_ACK;
2010 send_fin(cm_node, NULL);
2011 break;
2012 case NES_CM_STATE_FIN_WAIT1:
2013 case NES_CM_STATE_FIN_WAIT2:
2014 case NES_CM_STATE_LAST_ACK:
2015 case NES_CM_STATE_TIME_WAIT:
2016 case NES_CM_STATE_CLOSING:
2017 ret = -1;
2018 break;
2019 case NES_CM_STATE_LISTENING:
2020 case NES_CM_STATE_UNKNOWN:
2021 case NES_CM_STATE_INITED:
2022 case NES_CM_STATE_CLOSED:
2023 ret = rem_ref_cm_node(cm_core, cm_node);
2024 break;
2025 case NES_CM_STATE_TSA:
2026 if (cm_node->send_entry)
2027 printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2028 "send_entry=%p\n", cm_node->send_entry);
2029 ret = rem_ref_cm_node(cm_core, cm_node);
2030 break;
2031 }
2032 return ret;
2033 }
2034
2035
2036 /**
2037 * recv_pkt - recv an ETHERNET packet, and process it through CM
2038 * node state machine
2039 */
2040 static void mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2041 struct nes_vnic *nesvnic, struct sk_buff *skb)
2042 {
2043 struct nes_cm_node *cm_node = NULL;
2044 struct nes_cm_listener *listener = NULL;
2045 struct iphdr *iph;
2046 struct tcphdr *tcph;
2047 struct nes_cm_info nfo;
2048
2049 if (!skb)
2050 return;
2051 if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr)) {
2052 dev_kfree_skb_any(skb);
2053 return;
2054 }
2055
2056 iph = (struct iphdr *)skb->data;
2057 tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2058 skb_reset_network_header(skb);
2059 skb_set_transport_header(skb, sizeof(*tcph));
2060 if (!tcph) {
2061 dev_kfree_skb_any(skb);
2062 return;
2063 }
2064 skb->len = ntohs(iph->tot_len);
2065
2066 nfo.loc_addr = ntohl(iph->daddr);
2067 nfo.loc_port = ntohs(tcph->dest);
2068 nfo.rem_addr = ntohl(iph->saddr);
2069 nfo.rem_port = ntohs(tcph->source);
2070
2071 nes_debug(NES_DBG_CM, "Received packet: dest=" NIPQUAD_FMT
2072 ":0x%04X src=" NIPQUAD_FMT ":0x%04X\n",
2073 NIPQUAD(iph->daddr), tcph->dest,
2074 NIPQUAD(iph->saddr), tcph->source);
2075
2076 do {
2077 cm_node = find_node(cm_core,
2078 nfo.rem_port, nfo.rem_addr,
2079 nfo.loc_port, nfo.loc_addr);
2080
2081 if (!cm_node) {
2082 /* Only type of packet accepted are for */
2083 /* the PASSIVE open (syn only) */
2084 if ((!tcph->syn) || (tcph->ack)) {
2085 cm_packets_dropped++;
2086 break;
2087 }
2088 listener = find_listener(cm_core, nfo.loc_addr,
2089 nfo.loc_port,
2090 NES_CM_LISTENER_ACTIVE_STATE);
2091 if (listener) {
2092 nfo.cm_id = listener->cm_id;
2093 nfo.conn_type = listener->conn_type;
2094 } else {
2095 nes_debug(NES_DBG_CM, "Unable to find listener "
2096 "for the pkt\n");
2097 cm_packets_dropped++;
2098 dev_kfree_skb_any(skb);
2099 break;
2100 }
2101
2102 cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2103 listener);
2104 if (!cm_node) {
2105 nes_debug(NES_DBG_CM, "Unable to allocate "
2106 "node\n");
2107 cm_packets_dropped++;
2108 atomic_dec(&listener->ref_count);
2109 dev_kfree_skb_any(skb);
2110 break;
2111 }
2112 if (!tcph->rst && !tcph->fin) {
2113 cm_node->state = NES_CM_STATE_LISTENING;
2114 } else {
2115 cm_packets_dropped++;
2116 rem_ref_cm_node(cm_core, cm_node);
2117 dev_kfree_skb_any(skb);
2118 break;
2119 }
2120 add_ref_cm_node(cm_node);
2121 } else if (cm_node->state == NES_CM_STATE_TSA) {
2122 rem_ref_cm_node(cm_core, cm_node);
2123 atomic_inc(&cm_accel_dropped_pkts);
2124 dev_kfree_skb_any(skb);
2125 break;
2126 }
2127 process_packet(cm_node, skb, cm_core);
2128 rem_ref_cm_node(cm_core, cm_node);
2129 } while (0);
2130 }
2131
2132
2133 /**
2134 * nes_cm_alloc_core - allocate a top level instance of a cm core
2135 */
2136 static struct nes_cm_core *nes_cm_alloc_core(void)
2137 {
2138 int i;
2139
2140 struct nes_cm_core *cm_core;
2141 struct sk_buff *skb = NULL;
2142
2143 /* setup the CM core */
2144 /* alloc top level core control structure */
2145 cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2146 if (!cm_core)
2147 return NULL;
2148
2149 INIT_LIST_HEAD(&cm_core->connected_nodes);
2150 init_timer(&cm_core->tcp_timer);
2151 cm_core->tcp_timer.function = nes_cm_timer_tick;
2152
2153 cm_core->mtu = NES_CM_DEFAULT_MTU;
2154 cm_core->state = NES_CM_STATE_INITED;
2155 cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2156
2157 atomic_set(&cm_core->events_posted, 0);
2158
2159 /* init the packet lists */
2160 skb_queue_head_init(&cm_core->tx_free_list);
2161
2162 for (i = 0; i < NES_CM_DEFAULT_FRAME_CNT; i++) {
2163 skb = dev_alloc_skb(cm_core->mtu);
2164 if (!skb) {
2165 kfree(cm_core);
2166 return NULL;
2167 }
2168 /* add 'raw' skb to free frame list */
2169 skb_queue_head(&cm_core->tx_free_list, skb);
2170 }
2171
2172 cm_core->api = &nes_cm_api;
2173
2174 spin_lock_init(&cm_core->ht_lock);
2175 spin_lock_init(&cm_core->listen_list_lock);
2176
2177 INIT_LIST_HEAD(&cm_core->listen_list.list);
2178
2179 nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2180
2181 nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2182 cm_core->event_wq = create_singlethread_workqueue("nesewq");
2183 cm_core->post_event = nes_cm_post_event;
2184 nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2185 cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2186
2187 print_core(cm_core);
2188 return cm_core;
2189 }
2190
2191
2192 /**
2193 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2194 */
2195 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2196 {
2197 nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2198
2199 if (!cm_core)
2200 return -EINVAL;
2201
2202 barrier();
2203
2204 if (timer_pending(&cm_core->tcp_timer)) {
2205 del_timer(&cm_core->tcp_timer);
2206 }
2207
2208 destroy_workqueue(cm_core->event_wq);
2209 destroy_workqueue(cm_core->disconn_wq);
2210 nes_debug(NES_DBG_CM, "\n");
2211 kfree(cm_core);
2212
2213 return 0;
2214 }
2215
2216
2217 /**
2218 * mini_cm_get
2219 */
2220 static int mini_cm_get(struct nes_cm_core *cm_core)
2221 {
2222 return cm_core->state;
2223 }
2224
2225
2226 /**
2227 * mini_cm_set
2228 */
2229 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2230 {
2231 int ret = 0;
2232
2233 switch (type) {
2234 case NES_CM_SET_PKT_SIZE:
2235 cm_core->mtu = value;
2236 break;
2237 case NES_CM_SET_FREE_PKT_Q_SIZE:
2238 cm_core->free_tx_pkt_max = value;
2239 break;
2240 default:
2241 /* unknown set option */
2242 ret = -EINVAL;
2243 }
2244
2245 return ret;
2246 }
2247
2248
2249 /**
2250 * nes_cm_init_tsa_conn setup HW; MPA frames must be
2251 * successfully exchanged when this is called
2252 */
2253 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2254 {
2255 int ret = 0;
2256
2257 if (!nesqp)
2258 return -EINVAL;
2259
2260 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2261 NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2262 NES_QPCONTEXT_MISC_DROS);
2263
2264 if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2265 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2266
2267 nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2268
2269 nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2270
2271 nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2272 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2273
2274 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2275 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2276 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2277
2278 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2279 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2280 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2281
2282 nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2283 nesqp->nesqp_context->ts_recent = 0;
2284 nesqp->nesqp_context->ts_age = 0;
2285 nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2286 nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2287 nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2288 nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2289 cm_node->tcp_cntxt.rcv_wscale);
2290 nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2291 nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2292 nesqp->nesqp_context->srtt = 0;
2293 nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2294 nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2295 nesqp->nesqp_context->cwnd = cpu_to_le32(2*cm_node->tcp_cntxt.mss);
2296 nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2297 nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2298 nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2299
2300 nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2301 " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2302 nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2303 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2304 cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2305 le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2306 le32_to_cpu(nesqp->nesqp_context->misc));
2307 nes_debug(NES_DBG_CM, " snd_wnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2308 nes_debug(NES_DBG_CM, " snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2309 nes_debug(NES_DBG_CM, " max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2310
2311 nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2312 cm_node->state = NES_CM_STATE_TSA;
2313
2314 return ret;
2315 }
2316
2317
2318 /**
2319 * nes_cm_disconn
2320 */
2321 int nes_cm_disconn(struct nes_qp *nesqp)
2322 {
2323 unsigned long flags;
2324
2325 spin_lock_irqsave(&nesqp->lock, flags);
2326 if (nesqp->disconn_pending == 0) {
2327 nesqp->disconn_pending++;
2328 spin_unlock_irqrestore(&nesqp->lock, flags);
2329 /* init our disconnect work element, to */
2330 INIT_WORK(&nesqp->disconn_work, nes_disconnect_worker);
2331
2332 queue_work(g_cm_core->disconn_wq, &nesqp->disconn_work);
2333 } else
2334 spin_unlock_irqrestore(&nesqp->lock, flags);
2335
2336 return 0;
2337 }
2338
2339
2340 /**
2341 * nes_disconnect_worker
2342 */
2343 static void nes_disconnect_worker(struct work_struct *work)
2344 {
2345 struct nes_qp *nesqp = container_of(work, struct nes_qp, disconn_work);
2346
2347 nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2348 nesqp->last_aeq, nesqp->hwqp.qp_id);
2349 nes_cm_disconn_true(nesqp);
2350 }
2351
2352
2353 /**
2354 * nes_cm_disconn_true
2355 */
2356 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2357 {
2358 unsigned long flags;
2359 int ret = 0;
2360 struct iw_cm_id *cm_id;
2361 struct iw_cm_event cm_event;
2362 struct nes_vnic *nesvnic;
2363 u16 last_ae;
2364 u8 original_hw_tcp_state;
2365 u8 original_ibqp_state;
2366 u8 issued_disconnect_reset = 0;
2367
2368 if (!nesqp) {
2369 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2370 return -1;
2371 }
2372
2373 spin_lock_irqsave(&nesqp->lock, flags);
2374 cm_id = nesqp->cm_id;
2375 /* make sure we havent already closed this connection */
2376 if (!cm_id) {
2377 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2378 nesqp->hwqp.qp_id);
2379 spin_unlock_irqrestore(&nesqp->lock, flags);
2380 return -1;
2381 }
2382
2383 nesvnic = to_nesvnic(nesqp->ibqp.device);
2384 nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2385
2386 original_hw_tcp_state = nesqp->hw_tcp_state;
2387 original_ibqp_state = nesqp->ibqp_state;
2388 last_ae = nesqp->last_aeq;
2389
2390
2391 nes_debug(NES_DBG_CM, "set ibqp_state=%u\n", nesqp->ibqp_state);
2392
2393 if ((nesqp->cm_id) && (cm_id->event_handler)) {
2394 if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2395 ((original_ibqp_state == IB_QPS_RTS) &&
2396 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2397 atomic_inc(&cm_disconnects);
2398 cm_event.event = IW_CM_EVENT_DISCONNECT;
2399 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET) {
2400 issued_disconnect_reset = 1;
2401 cm_event.status = IW_CM_EVENT_STATUS_RESET;
2402 nes_debug(NES_DBG_CM, "Generating a CM "
2403 "Disconnect Event (status reset) for "
2404 "QP%u, cm_id = %p. \n",
2405 nesqp->hwqp.qp_id, cm_id);
2406 } else
2407 cm_event.status = IW_CM_EVENT_STATUS_OK;
2408
2409 cm_event.local_addr = cm_id->local_addr;
2410 cm_event.remote_addr = cm_id->remote_addr;
2411 cm_event.private_data = NULL;
2412 cm_event.private_data_len = 0;
2413
2414 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2415 " for QP%u, SQ Head = %u, SQ Tail = %u. "
2416 "cm_id = %p, refcount = %u.\n",
2417 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2418 nesqp->hwqp.sq_tail, cm_id,
2419 atomic_read(&nesqp->refcount));
2420
2421 spin_unlock_irqrestore(&nesqp->lock, flags);
2422 ret = cm_id->event_handler(cm_id, &cm_event);
2423 if (ret)
2424 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2425 "returned, ret=%d\n", ret);
2426 spin_lock_irqsave(&nesqp->lock, flags);
2427 }
2428
2429 nesqp->disconn_pending = 0;
2430 /* There might have been another AE while the lock was released */
2431 original_hw_tcp_state = nesqp->hw_tcp_state;
2432 original_ibqp_state = nesqp->ibqp_state;
2433 last_ae = nesqp->last_aeq;
2434
2435 if ((issued_disconnect_reset == 0) && (nesqp->cm_id) &&
2436 ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2437 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2438 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2439 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2440 atomic_inc(&cm_closes);
2441 nesqp->cm_id = NULL;
2442 nesqp->in_disconnect = 0;
2443 spin_unlock_irqrestore(&nesqp->lock, flags);
2444 nes_disconnect(nesqp, 1);
2445
2446 cm_id->provider_data = nesqp;
2447 /* Send up the close complete event */
2448 cm_event.event = IW_CM_EVENT_CLOSE;
2449 cm_event.status = IW_CM_EVENT_STATUS_OK;
2450 cm_event.provider_data = cm_id->provider_data;
2451 cm_event.local_addr = cm_id->local_addr;
2452 cm_event.remote_addr = cm_id->remote_addr;
2453 cm_event.private_data = NULL;
2454 cm_event.private_data_len = 0;
2455
2456 ret = cm_id->event_handler(cm_id, &cm_event);
2457 if (ret) {
2458 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2459 }
2460
2461 cm_id->rem_ref(cm_id);
2462
2463 spin_lock_irqsave(&nesqp->lock, flags);
2464 if (nesqp->flush_issued == 0) {
2465 nesqp->flush_issued = 1;
2466 spin_unlock_irqrestore(&nesqp->lock, flags);
2467 flush_wqes(nesvnic->nesdev, nesqp,
2468 NES_CQP_FLUSH_RQ, 1);
2469 } else
2470 spin_unlock_irqrestore(&nesqp->lock, flags);
2471 } else {
2472 cm_id = nesqp->cm_id;
2473 spin_unlock_irqrestore(&nesqp->lock, flags);
2474 /* check to see if the inbound reset beat the outbound reset */
2475 if ((!cm_id) && (last_ae==NES_AEQE_AEID_RESET_SENT)) {
2476 nes_debug(NES_DBG_CM, "QP%u: Decing refcount "
2477 "due to inbound reset beating the "
2478 "outbound reset.\n", nesqp->hwqp.qp_id);
2479 }
2480 }
2481 } else {
2482 nesqp->disconn_pending = 0;
2483 spin_unlock_irqrestore(&nesqp->lock, flags);
2484 }
2485
2486 return 0;
2487 }
2488
2489
2490 /**
2491 * nes_disconnect
2492 */
2493 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2494 {
2495 int ret = 0;
2496 struct nes_vnic *nesvnic;
2497 struct nes_device *nesdev;
2498
2499 nesvnic = to_nesvnic(nesqp->ibqp.device);
2500 if (!nesvnic)
2501 return -EINVAL;
2502
2503 nesdev = nesvnic->nesdev;
2504
2505 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2506 atomic_read(&nesvnic->netdev->refcnt));
2507
2508 if (nesqp->active_conn) {
2509
2510 /* indicate this connection is NOT active */
2511 nesqp->active_conn = 0;
2512 } else {
2513 /* Need to free the Last Streaming Mode Message */
2514 if (nesqp->ietf_frame) {
2515 pci_free_consistent(nesdev->pcidev,
2516 nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
2517 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2518 }
2519 }
2520
2521 /* close the CM node down if it is still active */
2522 if (nesqp->cm_node) {
2523 nes_debug(NES_DBG_CM, "Call close API\n");
2524
2525 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2526 }
2527
2528 return ret;
2529 }
2530
2531
2532 /**
2533 * nes_accept
2534 */
2535 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2536 {
2537 u64 u64temp;
2538 struct ib_qp *ibqp;
2539 struct nes_qp *nesqp;
2540 struct nes_vnic *nesvnic;
2541 struct nes_device *nesdev;
2542 struct nes_cm_node *cm_node;
2543 struct nes_adapter *adapter;
2544 struct ib_qp_attr attr;
2545 struct iw_cm_event cm_event;
2546 struct nes_hw_qp_wqe *wqe;
2547 struct nes_v4_quad nes_quad;
2548 u32 crc_value;
2549 int ret;
2550
2551 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2552 if (!ibqp)
2553 return -EINVAL;
2554
2555 /* get all our handles */
2556 nesqp = to_nesqp(ibqp);
2557 nesvnic = to_nesvnic(nesqp->ibqp.device);
2558 nesdev = nesvnic->nesdev;
2559 adapter = nesdev->nesadapter;
2560
2561 cm_node = (struct nes_cm_node *)cm_id->provider_data;
2562 nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
2563 "%s\n", cm_node, nesvnic, nesvnic->netdev,
2564 nesvnic->netdev->name);
2565
2566 /* associate the node with the QP */
2567 nesqp->cm_node = (void *)cm_node;
2568 cm_node->nesqp = nesqp;
2569 nes_add_ref(&nesqp->ibqp);
2570
2571 nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
2572 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
2573 atomic_inc(&cm_accepts);
2574
2575 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2576 atomic_read(&nesvnic->netdev->refcnt));
2577
2578 /* allocate the ietf frame and space for private data */
2579 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
2580 sizeof(struct ietf_mpa_frame) + conn_param->private_data_len,
2581 &nesqp->ietf_frame_pbase);
2582
2583 if (!nesqp->ietf_frame) {
2584 nes_debug(NES_DBG_CM, "Unable to allocate memory for private "
2585 "data\n");
2586 return -ENOMEM;
2587 }
2588
2589
2590 /* setup the MPA frame */
2591 nesqp->private_data_len = conn_param->private_data_len;
2592 memcpy(nesqp->ietf_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
2593
2594 memcpy(nesqp->ietf_frame->priv_data, conn_param->private_data,
2595 conn_param->private_data_len);
2596
2597 nesqp->ietf_frame->priv_data_len =
2598 cpu_to_be16(conn_param->private_data_len);
2599 nesqp->ietf_frame->rev = mpa_version;
2600 nesqp->ietf_frame->flags = IETF_MPA_FLAGS_CRC;
2601
2602 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
2603 wqe = &nesqp->hwqp.sq_vbase[0];
2604
2605 if (cm_id->remote_addr.sin_addr.s_addr !=
2606 cm_id->local_addr.sin_addr.s_addr) {
2607 u64temp = (unsigned long)nesqp;
2608 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
2609 set_wqe_64bit_value(wqe->wqe_words,
2610 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
2611 u64temp);
2612 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
2613 cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
2614 NES_IWARP_SQ_WQE_WRPDU);
2615 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
2616 cpu_to_le32(conn_param->private_data_len +
2617 sizeof(struct ietf_mpa_frame));
2618 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
2619 cpu_to_le32((u32)nesqp->ietf_frame_pbase);
2620 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
2621 cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
2622 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
2623 cpu_to_le32(conn_param->private_data_len +
2624 sizeof(struct ietf_mpa_frame));
2625 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
2626
2627 nesqp->nesqp_context->ird_ord_sizes |=
2628 cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2629 NES_QPCONTEXT_ORDIRD_WRPDU);
2630 } else {
2631 nesqp->nesqp_context->ird_ord_sizes |=
2632 cpu_to_le32((NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
2633 NES_QPCONTEXT_ORDIRD_WRPDU |
2634 NES_QPCONTEXT_ORDIRD_ALSMM));
2635 }
2636 nesqp->skip_lsmm = 1;
2637
2638
2639 /* Cache the cm_id in the qp */
2640 nesqp->cm_id = cm_id;
2641 cm_node->cm_id = cm_id;
2642
2643 /* nesqp->cm_node = (void *)cm_id->provider_data; */
2644 cm_id->provider_data = nesqp;
2645 nesqp->active_conn = 0;
2646
2647 if (cm_node->state == NES_CM_STATE_TSA)
2648 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
2649 cm_node);
2650
2651 nes_cm_init_tsa_conn(nesqp, cm_node);
2652
2653 nesqp->nesqp_context->tcpPorts[0] =
2654 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
2655 nesqp->nesqp_context->tcpPorts[1] =
2656 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
2657
2658 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2659 nesqp->nesqp_context->ip0 =
2660 cpu_to_le32(ntohl(nesvnic->local_ipaddr));
2661 else
2662 nesqp->nesqp_context->ip0 =
2663 cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
2664
2665 nesqp->nesqp_context->misc2 |= cpu_to_le32(
2666 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
2667 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
2668
2669 nesqp->nesqp_context->arp_index_vlan |=
2670 cpu_to_le32(nes_arp_table(nesdev,
2671 le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
2672 NES_ARP_RESOLVE) << 16);
2673
2674 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
2675 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
2676
2677 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
2678
2679 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
2680 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
2681 nesqp->nesqp_context->ird_ord_sizes |=
2682 cpu_to_le32((u32)conn_param->ord);
2683
2684 memset(&nes_quad, 0, sizeof(nes_quad));
2685 nes_quad.DstIpAdrIndex =
2686 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
2687 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
2688 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
2689 else
2690 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
2691 nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
2692 nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
2693
2694 /* Produce hash key */
2695 crc_value = get_crc_value(&nes_quad);
2696 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
2697 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
2698 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
2699
2700 nesqp->hte_index &= adapter->hte_index_mask;
2701 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
2702
2703 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
2704
2705 nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
2706 "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
2707 "private data length=%zu.\n", nesqp->hwqp.qp_id,
2708 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2709 ntohs(cm_id->remote_addr.sin_port),
2710 ntohl(cm_id->local_addr.sin_addr.s_addr),
2711 ntohs(cm_id->local_addr.sin_port),
2712 le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2713 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2714 conn_param->private_data_len +
2715 sizeof(struct ietf_mpa_frame));
2716
2717 attr.qp_state = IB_QPS_RTS;
2718 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
2719
2720 /* notify OF layer that accept event was successfull */
2721 cm_id->add_ref(cm_id);
2722
2723 cm_event.event = IW_CM_EVENT_ESTABLISHED;
2724 cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
2725 cm_event.provider_data = (void *)nesqp;
2726 cm_event.local_addr = cm_id->local_addr;
2727 cm_event.remote_addr = cm_id->remote_addr;
2728 cm_event.private_data = NULL;
2729 cm_event.private_data_len = 0;
2730 ret = cm_id->event_handler(cm_id, &cm_event);
2731 if (cm_node->loopbackpartner) {
2732 cm_node->loopbackpartner->mpa_frame_size =
2733 nesqp->private_data_len;
2734 /* copy entire MPA frame to our cm_node's frame */
2735 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
2736 nesqp->ietf_frame->priv_data, nesqp->private_data_len);
2737 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
2738 }
2739 if (ret)
2740 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
2741 "ret=%d\n", __func__, __LINE__, ret);
2742
2743 return 0;
2744 }
2745
2746
2747 /**
2748 * nes_reject
2749 */
2750 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
2751 {
2752 struct nes_cm_node *cm_node;
2753 struct nes_cm_core *cm_core;
2754
2755 atomic_inc(&cm_rejects);
2756 cm_node = (struct nes_cm_node *) cm_id->provider_data;
2757 cm_core = cm_node->cm_core;
2758 cm_node->mpa_frame_size = sizeof(struct ietf_mpa_frame) + pdata_len;
2759
2760 strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
2761 memcpy(&cm_node->mpa_frame.priv_data, pdata, pdata_len);
2762
2763 cm_node->mpa_frame.priv_data_len = cpu_to_be16(pdata_len);
2764 cm_node->mpa_frame.rev = mpa_version;
2765 cm_node->mpa_frame.flags = IETF_MPA_FLAGS_CRC | IETF_MPA_FLAGS_REJECT;
2766
2767 cm_core->api->reject(cm_core, &cm_node->mpa_frame, cm_node);
2768
2769 return 0;
2770 }
2771
2772
2773 /**
2774 * nes_connect
2775 * setup and launch cm connect node
2776 */
2777 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2778 {
2779 struct ib_qp *ibqp;
2780 struct nes_qp *nesqp;
2781 struct nes_vnic *nesvnic;
2782 struct nes_device *nesdev;
2783 struct nes_cm_node *cm_node;
2784 struct nes_cm_info cm_info;
2785
2786 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
2787 if (!ibqp)
2788 return -EINVAL;
2789 nesqp = to_nesqp(ibqp);
2790 if (!nesqp)
2791 return -EINVAL;
2792 nesvnic = to_nesvnic(nesqp->ibqp.device);
2793 if (!nesvnic)
2794 return -EINVAL;
2795 nesdev = nesvnic->nesdev;
2796 if (!nesdev)
2797 return -EINVAL;
2798
2799 nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
2800 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
2801 ntohl(nesvnic->local_ipaddr),
2802 ntohl(cm_id->remote_addr.sin_addr.s_addr),
2803 ntohs(cm_id->remote_addr.sin_port),
2804 ntohl(cm_id->local_addr.sin_addr.s_addr),
2805 ntohs(cm_id->local_addr.sin_port));
2806
2807 atomic_inc(&cm_connects);
2808 nesqp->active_conn = 1;
2809
2810 /* cache the cm_id in the qp */
2811 nesqp->cm_id = cm_id;
2812
2813 cm_id->provider_data = nesqp;
2814
2815 nesqp->private_data_len = conn_param->private_data_len;
2816 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
2817 nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
2818 nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
2819 conn_param->private_data_len);
2820
2821 if (cm_id->local_addr.sin_addr.s_addr !=
2822 cm_id->remote_addr.sin_addr.s_addr)
2823 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2824 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
2825
2826 /* set up the connection params for the node */
2827 cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
2828 cm_info.loc_port = htons(cm_id->local_addr.sin_port);
2829 cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
2830 cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
2831 cm_info.cm_id = cm_id;
2832 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2833
2834 cm_id->add_ref(cm_id);
2835
2836 /* create a connect CM node connection */
2837 cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
2838 conn_param->private_data_len, (void *)conn_param->private_data,
2839 &cm_info);
2840 if (!cm_node) {
2841 if (cm_id->local_addr.sin_addr.s_addr !=
2842 cm_id->remote_addr.sin_addr.s_addr)
2843 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
2844 PCI_FUNC(nesdev->pcidev->devfn),
2845 NES_MANAGE_APBVT_DEL);
2846
2847 cm_id->rem_ref(cm_id);
2848 return -ENOMEM;
2849 }
2850
2851 cm_node->apbvt_set = 1;
2852 nesqp->cm_node = cm_node;
2853 cm_node->nesqp = nesqp;
2854 nes_add_ref(&nesqp->ibqp);
2855
2856 return 0;
2857 }
2858
2859
2860 /**
2861 * nes_create_listen
2862 */
2863 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
2864 {
2865 struct nes_vnic *nesvnic;
2866 struct nes_cm_listener *cm_node;
2867 struct nes_cm_info cm_info;
2868 struct nes_adapter *adapter;
2869 int err;
2870
2871
2872 nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
2873 cm_id, ntohs(cm_id->local_addr.sin_port));
2874
2875 nesvnic = to_nesvnic(cm_id->device);
2876 if (!nesvnic)
2877 return -EINVAL;
2878 adapter = nesvnic->nesdev->nesadapter;
2879 nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
2880 nesvnic, nesvnic->netdev, nesvnic->netdev->name);
2881
2882 nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
2883 nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
2884
2885 /* setup listen params in our api call struct */
2886 cm_info.loc_addr = nesvnic->local_ipaddr;
2887 cm_info.loc_port = cm_id->local_addr.sin_port;
2888 cm_info.backlog = backlog;
2889 cm_info.cm_id = cm_id;
2890
2891 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
2892
2893
2894 cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
2895 if (!cm_node) {
2896 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
2897 __func__, __LINE__);
2898 return -ENOMEM;
2899 }
2900
2901 cm_id->provider_data = cm_node;
2902
2903 if (!cm_node->reused_node) {
2904 err = nes_manage_apbvt(nesvnic,
2905 ntohs(cm_id->local_addr.sin_port),
2906 PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
2907 NES_MANAGE_APBVT_ADD);
2908 if (err) {
2909 printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
2910 err);
2911 g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
2912 return err;
2913 }
2914 cm_listens_created++;
2915 }
2916
2917 cm_id->add_ref(cm_id);
2918 cm_id->provider_data = (void *)cm_node;
2919
2920
2921 return 0;
2922 }
2923
2924
2925 /**
2926 * nes_destroy_listen
2927 */
2928 int nes_destroy_listen(struct iw_cm_id *cm_id)
2929 {
2930 if (cm_id->provider_data)
2931 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
2932 else
2933 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
2934
2935 cm_id->rem_ref(cm_id);
2936
2937 return 0;
2938 }
2939
2940
2941 /**
2942 * nes_cm_recv
2943 */
2944 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
2945 {
2946 cm_packets_received++;
2947 if ((g_cm_core) && (g_cm_core->api)) {
2948 g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
2949 } else {
2950 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
2951 " cm is not setup properly.\n");
2952 }
2953
2954 return 0;
2955 }
2956
2957
2958 /**
2959 * nes_cm_start
2960 * Start and init a cm core module
2961 */
2962 int nes_cm_start(void)
2963 {
2964 nes_debug(NES_DBG_CM, "\n");
2965 /* create the primary CM core, pass this handle to subsequent core inits */
2966 g_cm_core = nes_cm_alloc_core();
2967 if (g_cm_core) {
2968 return 0;
2969 } else {
2970 return -ENOMEM;
2971 }
2972 }
2973
2974
2975 /**
2976 * nes_cm_stop
2977 * stop and dealloc all cm core instances
2978 */
2979 int nes_cm_stop(void)
2980 {
2981 g_cm_core->api->destroy_cm_core(g_cm_core);
2982 return 0;
2983 }
2984
2985
2986 /**
2987 * cm_event_connected
2988 * handle a connected event, setup QPs and HW
2989 */
2990 static void cm_event_connected(struct nes_cm_event *event)
2991 {
2992 u64 u64temp;
2993 struct nes_qp *nesqp;
2994 struct nes_vnic *nesvnic;
2995 struct nes_device *nesdev;
2996 struct nes_cm_node *cm_node;
2997 struct nes_adapter *nesadapter;
2998 struct ib_qp_attr attr;
2999 struct iw_cm_id *cm_id;
3000 struct iw_cm_event cm_event;
3001 struct nes_hw_qp_wqe *wqe;
3002 struct nes_v4_quad nes_quad;
3003 u32 crc_value;
3004 int ret;
3005
3006 /* get all our handles */
3007 cm_node = event->cm_node;
3008 cm_id = cm_node->cm_id;
3009 nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3010 nesqp = (struct nes_qp *)cm_id->provider_data;
3011 nesvnic = to_nesvnic(nesqp->ibqp.device);
3012 nesdev = nesvnic->nesdev;
3013 nesadapter = nesdev->nesadapter;
3014
3015 if (nesqp->destroyed) {
3016 return;
3017 }
3018 atomic_inc(&cm_connecteds);
3019 nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
3020 " local port 0x%04X. jiffies = %lu.\n",
3021 nesqp->hwqp.qp_id,
3022 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3023 ntohs(cm_id->remote_addr.sin_port),
3024 ntohs(cm_id->local_addr.sin_port),
3025 jiffies);
3026
3027 nes_cm_init_tsa_conn(nesqp, cm_node);
3028
3029 /* set the QP tsa context */
3030 nesqp->nesqp_context->tcpPorts[0] =
3031 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3032 nesqp->nesqp_context->tcpPorts[1] =
3033 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3034 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3035 nesqp->nesqp_context->ip0 =
3036 cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3037 else
3038 nesqp->nesqp_context->ip0 =
3039 cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3040
3041 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3042 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3043 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3044 nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3045 nes_arp_table(nesdev,
3046 le32_to_cpu(nesqp->nesqp_context->ip0),
3047 NULL, NES_ARP_RESOLVE) << 16);
3048 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3049 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3050 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3051 nesqp->nesqp_context->ird_ord_sizes |=
3052 cpu_to_le32((u32)1 <<
3053 NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3054
3055 /* Adjust tail for not having a LSMM */
3056 nesqp->hwqp.sq_tail = 1;
3057
3058 #if defined(NES_SEND_FIRST_WRITE)
3059 if (cm_node->send_write0) {
3060 nes_debug(NES_DBG_CM, "Sending first write.\n");
3061 wqe = &nesqp->hwqp.sq_vbase[0];
3062 u64temp = (unsigned long)nesqp;
3063 u64temp |= NES_SW_CONTEXT_ALIGN>>1;
3064 set_wqe_64bit_value(wqe->wqe_words,
3065 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
3066 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3067 cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
3068 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
3069 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
3070 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
3071 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
3072 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
3073
3074 /* use the reserved spot on the WQ for the extra first WQE */
3075 nesqp->nesqp_context->ird_ord_sizes &=
3076 cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3077 NES_QPCONTEXT_ORDIRD_WRPDU |
3078 NES_QPCONTEXT_ORDIRD_ALSMM));
3079 nesqp->skip_lsmm = 1;
3080 nesqp->hwqp.sq_tail = 0;
3081 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3082 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3083 }
3084 #endif
3085
3086 memset(&nes_quad, 0, sizeof(nes_quad));
3087
3088 nes_quad.DstIpAdrIndex =
3089 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3090 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3091 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3092 else
3093 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3094 nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3095 nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3096
3097 /* Produce hash key */
3098 crc_value = get_crc_value(&nes_quad);
3099 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3100 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3101 nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3102
3103 nesqp->hte_index &= nesadapter->hte_index_mask;
3104 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3105
3106 nesqp->ietf_frame = &cm_node->mpa_frame;
3107 nesqp->private_data_len = (u8) cm_node->mpa_frame_size;
3108 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3109
3110 /* notify OF layer we successfully created the requested connection */
3111 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3112 cm_event.status = IW_CM_EVENT_STATUS_ACCEPTED;
3113 cm_event.provider_data = cm_id->provider_data;
3114 cm_event.local_addr.sin_family = AF_INET;
3115 cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3116 cm_event.remote_addr = cm_id->remote_addr;
3117
3118 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3119 cm_event.private_data_len = (u8) event->cm_node->mpa_frame_size;
3120
3121 cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3122 ret = cm_id->event_handler(cm_id, &cm_event);
3123 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3124
3125 if (ret)
3126 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3127 "ret=%d\n", __func__, __LINE__, ret);
3128 attr.qp_state = IB_QPS_RTS;
3129 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3130
3131 nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3132 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3133
3134 return;
3135 }
3136
3137
3138 /**
3139 * cm_event_connect_error
3140 */
3141 static void cm_event_connect_error(struct nes_cm_event *event)
3142 {
3143 struct nes_qp *nesqp;
3144 struct iw_cm_id *cm_id;
3145 struct iw_cm_event cm_event;
3146 /* struct nes_cm_info cm_info; */
3147 int ret;
3148
3149 if (!event->cm_node)
3150 return;
3151
3152 cm_id = event->cm_node->cm_id;
3153 if (!cm_id) {
3154 return;
3155 }
3156
3157 nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3158 nesqp = cm_id->provider_data;
3159
3160 if (!nesqp) {
3161 return;
3162 }
3163
3164 /* notify OF layer about this connection error event */
3165 /* cm_id->rem_ref(cm_id); */
3166 nesqp->cm_id = NULL;
3167 cm_id->provider_data = NULL;
3168 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3169 cm_event.status = IW_CM_EVENT_STATUS_REJECTED;
3170 cm_event.provider_data = cm_id->provider_data;
3171 cm_event.local_addr = cm_id->local_addr;
3172 cm_event.remote_addr = cm_id->remote_addr;
3173 cm_event.private_data = NULL;
3174 cm_event.private_data_len = 0;
3175
3176 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3177 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3178 cm_event.remote_addr.sin_addr.s_addr);
3179
3180 ret = cm_id->event_handler(cm_id, &cm_event);
3181 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3182 if (ret)
3183 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3184 "ret=%d\n", __func__, __LINE__, ret);
3185 cm_id->rem_ref(cm_id);
3186
3187 rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3188 return;
3189 }
3190
3191
3192 /**
3193 * cm_event_reset
3194 */
3195 static void cm_event_reset(struct nes_cm_event *event)
3196 {
3197 struct nes_qp *nesqp;
3198 struct iw_cm_id *cm_id;
3199 struct iw_cm_event cm_event;
3200 /* struct nes_cm_info cm_info; */
3201 int ret;
3202
3203 if (!event->cm_node)
3204 return;
3205
3206 if (!event->cm_node->cm_id)
3207 return;
3208
3209 cm_id = event->cm_node->cm_id;
3210
3211 nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3212 nesqp = cm_id->provider_data;
3213
3214 nesqp->cm_id = NULL;
3215 /* cm_id->provider_data = NULL; */
3216 cm_event.event = IW_CM_EVENT_DISCONNECT;
3217 cm_event.status = IW_CM_EVENT_STATUS_RESET;
3218 cm_event.provider_data = cm_id->provider_data;
3219 cm_event.local_addr = cm_id->local_addr;
3220 cm_event.remote_addr = cm_id->remote_addr;
3221 cm_event.private_data = NULL;
3222 cm_event.private_data_len = 0;
3223
3224 ret = cm_id->event_handler(cm_id, &cm_event);
3225 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3226
3227
3228 /* notify OF layer about this connection error event */
3229 cm_id->rem_ref(cm_id);
3230
3231 return;
3232 }
3233
3234
3235 /**
3236 * cm_event_mpa_req
3237 */
3238 static void cm_event_mpa_req(struct nes_cm_event *event)
3239 {
3240 struct iw_cm_id *cm_id;
3241 struct iw_cm_event cm_event;
3242 int ret;
3243 struct nes_cm_node *cm_node;
3244
3245 cm_node = event->cm_node;
3246 if (!cm_node)
3247 return;
3248 cm_id = cm_node->cm_id;
3249
3250 atomic_inc(&cm_connect_reqs);
3251 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3252 cm_node, cm_id, jiffies);
3253
3254 cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3255 cm_event.status = IW_CM_EVENT_STATUS_OK;
3256 cm_event.provider_data = (void *)cm_node;
3257
3258 cm_event.local_addr.sin_family = AF_INET;
3259 cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3260 cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3261
3262 cm_event.remote_addr.sin_family = AF_INET;
3263 cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3264 cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3265
3266 cm_event.private_data = cm_node->mpa_frame_buf;
3267 cm_event.private_data_len = (u8) cm_node->mpa_frame_size;
3268
3269 ret = cm_id->event_handler(cm_id, &cm_event);
3270 if (ret)
3271 printk("%s[%u] OFA CM event_handler returned, ret=%d\n",
3272 __func__, __LINE__, ret);
3273
3274 return;
3275 }
3276
3277
3278 static void nes_cm_event_handler(struct work_struct *);
3279
3280 /**
3281 * nes_cm_post_event
3282 * post an event to the cm event handler
3283 */
3284 static int nes_cm_post_event(struct nes_cm_event *event)
3285 {
3286 atomic_inc(&event->cm_node->cm_core->events_posted);
3287 add_ref_cm_node(event->cm_node);
3288 event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3289 INIT_WORK(&event->event_work, nes_cm_event_handler);
3290 nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3291 event->cm_node, event);
3292
3293 queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3294
3295 nes_debug(NES_DBG_CM, "Exit\n");
3296 return 0;
3297 }
3298
3299
3300 /**
3301 * nes_cm_event_handler
3302 * worker function to handle cm events
3303 * will free instance of nes_cm_event
3304 */
3305 static void nes_cm_event_handler(struct work_struct *work)
3306 {
3307 struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3308 event_work);
3309 struct nes_cm_core *cm_core;
3310
3311 if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3312 return;
3313
3314 cm_core = event->cm_node->cm_core;
3315 nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3316 event, event->type, atomic_read(&cm_core->events_posted));
3317
3318 switch (event->type) {
3319 case NES_CM_EVENT_MPA_REQ:
3320 cm_event_mpa_req(event);
3321 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3322 event->cm_node);
3323 break;
3324 case NES_CM_EVENT_RESET:
3325 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3326 event->cm_node);
3327 cm_event_reset(event);
3328 break;
3329 case NES_CM_EVENT_CONNECTED:
3330 if ((!event->cm_node->cm_id) ||
3331 (event->cm_node->state != NES_CM_STATE_TSA))
3332 break;
3333 cm_event_connected(event);
3334 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3335 break;
3336 case NES_CM_EVENT_ABORTED:
3337 if ((!event->cm_node->cm_id) ||
3338 (event->cm_node->state == NES_CM_STATE_TSA))
3339 break;
3340 cm_event_connect_error(event);
3341 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3342 break;
3343 case NES_CM_EVENT_DROPPED_PKT:
3344 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3345 break;
3346 default:
3347 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3348 break;
3349 }
3350
3351 atomic_dec(&cm_core->events_posted);
3352 event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3353 rem_ref_cm_node(cm_core, event->cm_node);
3354 kfree(event);
3355
3356 return;
3357 }
Linux kernel - Deliverables
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