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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / infiniband / hw / nes / nes_cm.c
blob7f0aa23aef9dada8e26fa0e4f4c69111f9ce6bef
1 /*
2 * Copyright (c) 2006 - 2014 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34
35 #define TCPOPT_TIMESTAMP 8
36
37 #include <linux/atomic.h>
38 #include <linux/skbuff.h>
39 #include <linux/ip.h>
40 #include <linux/tcp.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/if_vlan.h>
44 #include <linux/notifier.h>
45 #include <linux/net.h>
46 #include <linux/types.h>
47 #include <linux/timer.h>
48 #include <linux/time.h>
49 #include <linux/delay.h>
50 #include <linux/etherdevice.h>
51 #include <linux/netdevice.h>
52 #include <linux/random.h>
53 #include <linux/list.h>
54 #include <linux/threads.h>
55 #include <linux/highmem.h>
56 #include <linux/slab.h>
57 #include <net/arp.h>
58 #include <net/neighbour.h>
59 #include <net/route.h>
60 #include <net/ip_fib.h>
61 #include <net/tcp.h>
62 #include <linux/fcntl.h>
63
64 #include "nes.h"
65
66 u32 cm_packets_sent;
67 u32 cm_packets_bounced;
68 u32 cm_packets_dropped;
69 u32 cm_packets_retrans;
70 u32 cm_packets_created;
71 u32 cm_packets_received;
72 atomic_t cm_listens_created;
73 atomic_t cm_listens_destroyed;
74 u32 cm_backlog_drops;
75 atomic_t cm_loopbacks;
76 atomic_t cm_nodes_created;
77 atomic_t cm_nodes_destroyed;
78 atomic_t cm_accel_dropped_pkts;
79 atomic_t cm_resets_recvd;
80
81 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
82 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
83 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
84 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
85 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
86 static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
87 static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
88 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
89 static int mini_cm_dealloc_core(struct nes_cm_core *);
90 static int mini_cm_get(struct nes_cm_core *);
91 static int mini_cm_set(struct nes_cm_core *, u32, u32);
92
93 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
94 static int add_ref_cm_node(struct nes_cm_node *);
95 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
96
97 static int nes_cm_disconn_true(struct nes_qp *);
98 static int nes_cm_post_event(struct nes_cm_event *event);
99 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
100 static void nes_disconnect_worker(struct work_struct *work);
101
102 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
103 static int send_mpa_reject(struct nes_cm_node *);
104 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
105 static int send_reset(struct nes_cm_node *, struct sk_buff *);
106 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
107 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
108 static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
109
110 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
111 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
112 static void cleanup_retrans_entry(struct nes_cm_node *);
113 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
114 static void free_retrans_entry(struct nes_cm_node *cm_node);
115 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
116
117 /* CM event handler functions */
118 static void cm_event_connected(struct nes_cm_event *);
119 static void cm_event_connect_error(struct nes_cm_event *);
120 static void cm_event_reset(struct nes_cm_event *);
121 static void cm_event_mpa_req(struct nes_cm_event *);
122 static void cm_event_mpa_reject(struct nes_cm_event *);
123 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
124
125 /* MPA build functions */
126 static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
127 static void build_mpa_v2(struct nes_cm_node *, void *, u8);
128 static void build_mpa_v1(struct nes_cm_node *, void *, u8);
129 static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
130
131 static void print_core(struct nes_cm_core *core);
132 static void record_ird_ord(struct nes_cm_node *, u16, u16);
133
134 /* External CM API Interface */
135 /* instance of function pointers for client API */
136 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
137 static const struct nes_cm_ops nes_cm_api = {
138 mini_cm_accelerated,
139 mini_cm_listen,
140 mini_cm_del_listen,
141 mini_cm_connect,
142 mini_cm_close,
143 mini_cm_accept,
144 mini_cm_reject,
145 mini_cm_recv_pkt,
146 mini_cm_dealloc_core,
147 mini_cm_get,
148 mini_cm_set
149 };
150
151 static struct nes_cm_core *g_cm_core;
152
153 atomic_t cm_connects;
154 atomic_t cm_accepts;
155 atomic_t cm_disconnects;
156 atomic_t cm_closes;
157 atomic_t cm_connecteds;
158 atomic_t cm_connect_reqs;
159 atomic_t cm_rejects;
160
161 int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
162 {
163 return add_ref_cm_node(cm_node);
164 }
165
166 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
167 {
168 return rem_ref_cm_node(cm_node->cm_core, cm_node);
169 }
170 /**
171 * create_event
172 */
173 static struct nes_cm_event *create_event(struct nes_cm_node * cm_node,
174 enum nes_cm_event_type type)
175 {
176 struct nes_cm_event *event;
177
178 if (!cm_node->cm_id)
179 return NULL;
180
181 /* allocate an empty event */
182 event = kzalloc(sizeof(*event), GFP_ATOMIC);
183
184 if (!event)
185 return NULL;
186
187 event->type = type;
188 event->cm_node = cm_node;
189 event->cm_info.rem_addr = cm_node->rem_addr;
190 event->cm_info.loc_addr = cm_node->loc_addr;
191 event->cm_info.rem_port = cm_node->rem_port;
192 event->cm_info.loc_port = cm_node->loc_port;
193 event->cm_info.cm_id = cm_node->cm_id;
194
195 nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
196 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
197 cm_node, event, type, event->cm_info.loc_addr,
198 event->cm_info.loc_port, event->cm_info.rem_addr,
199 event->cm_info.rem_port);
200
201 nes_cm_post_event(event);
202 return event;
203 }
204
205
206 /**
207 * send_mpa_request
208 */
209 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
210 {
211 u8 start_addr = 0;
212 u8 *start_ptr = &start_addr;
213 u8 **start_buff = &start_ptr;
214 u16 buff_len = 0;
215
216 if (!skb) {
217 nes_debug(NES_DBG_CM, "skb set to NULL\n");
218 return -1;
219 }
220
221 /* send an MPA Request frame */
222 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
223 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
224
225 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
226 }
227
228
229
230 static int send_mpa_reject(struct nes_cm_node *cm_node)
231 {
232 struct sk_buff *skb = NULL;
233 u8 start_addr = 0;
234 u8 *start_ptr = &start_addr;
235 u8 **start_buff = &start_ptr;
236 u16 buff_len = 0;
237 struct ietf_mpa_v1 *mpa_frame;
238
239 skb = dev_alloc_skb(MAX_CM_BUFFER);
240 if (!skb) {
241 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
242 return -ENOMEM;
243 }
244
245 /* send an MPA reject frame */
246 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
247 mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
248 mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
249 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
250
251 cm_node->state = NES_CM_STATE_FIN_WAIT1;
252 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
253 }
254
255
256 /**
257 * recv_mpa - process a received TCP pkt, we are expecting an
258 * IETF MPA frame
259 */
260 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
261 u32 len)
262 {
263 struct ietf_mpa_v1 *mpa_frame;
264 struct ietf_mpa_v2 *mpa_v2_frame;
265 struct ietf_rtr_msg *rtr_msg;
266 int mpa_hdr_len;
267 int priv_data_len;
268
269 *type = NES_MPA_REQUEST_ACCEPT;
270
271 /* assume req frame is in tcp data payload */
272 if (len < sizeof(struct ietf_mpa_v1)) {
273 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
274 return -EINVAL;
275 }
276
277 /* points to the beginning of the frame, which could be MPA V1 or V2 */
278 mpa_frame = (struct ietf_mpa_v1 *)buffer;
279 mpa_hdr_len = sizeof(struct ietf_mpa_v1);
280 priv_data_len = ntohs(mpa_frame->priv_data_len);
281
282 /* make sure mpa private data len is less than 512 bytes */
283 if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
284 nes_debug(NES_DBG_CM, "The received Length of Private"
285 " Data field exceeds 512 octets\n");
286 return -EINVAL;
287 }
288 /*
289 * make sure MPA receiver interoperate with the
290 * received MPA version and MPA key information
291 *
292 */
293 if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
294 nes_debug(NES_DBG_CM, "The received mpa version"
295 " is not supported\n");
296 return -EINVAL;
297 }
298 /*
299 * backwards compatibility only
300 */
301 if (mpa_frame->rev > cm_node->mpa_frame_rev) {
302 nes_debug(NES_DBG_CM, "The received mpa version"
303 " can not be interoperated\n");
304 return -EINVAL;
305 } else {
306 cm_node->mpa_frame_rev = mpa_frame->rev;
307 }
308
309 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
310 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
311 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
312 return -EINVAL;
313 }
314 } else {
315 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
316 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
317 return -EINVAL;
318 }
319 }
320
321 if (priv_data_len + mpa_hdr_len != len) {
322 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
323 " complete (%x + %x != %x)\n",
324 priv_data_len, mpa_hdr_len, len);
325 return -EINVAL;
326 }
327 /* make sure it does not exceed the max size */
328 if (len > MAX_CM_BUFFER) {
329 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
330 " (%x + %x != %x)\n",
331 priv_data_len, mpa_hdr_len, len);
332 return -EINVAL;
333 }
334
335 cm_node->mpa_frame_size = priv_data_len;
336
337 switch (mpa_frame->rev) {
338 case IETF_MPA_V2: {
339 u16 ird_size;
340 u16 ord_size;
341 u16 rtr_ctrl_ird;
342 u16 rtr_ctrl_ord;
343
344 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
345 mpa_hdr_len += IETF_RTR_MSG_SIZE;
346 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
347 rtr_msg = &mpa_v2_frame->rtr_msg;
348
349 /* parse rtr message */
350 rtr_ctrl_ird = ntohs(rtr_msg->ctrl_ird);
351 rtr_ctrl_ord = ntohs(rtr_msg->ctrl_ord);
352 ird_size = rtr_ctrl_ird & IETF_NO_IRD_ORD;
353 ord_size = rtr_ctrl_ord & IETF_NO_IRD_ORD;
354
355 if (!(rtr_ctrl_ird & IETF_PEER_TO_PEER)) {
356 /* send reset */
357 return -EINVAL;
358 }
359 if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD)
360 cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
361
362 if (cm_node->mpav2_ird_ord != IETF_NO_IRD_ORD) {
363 /* responder */
364 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
365 /* we are still negotiating */
366 if (ord_size > NES_MAX_IRD) {
367 cm_node->ird_size = NES_MAX_IRD;
368 } else {
369 cm_node->ird_size = ord_size;
370 if (ord_size == 0 &&
371 (rtr_ctrl_ord & IETF_RDMA0_READ)) {
372 cm_node->ird_size = 1;
373 nes_debug(NES_DBG_CM,
374 "%s: Remote peer doesn't support RDMA0_READ (ord=%u)\n",
375 __func__, ord_size);
376 }
377 }
378 if (ird_size > NES_MAX_ORD)
379 cm_node->ord_size = NES_MAX_ORD;
380 else
381 cm_node->ord_size = ird_size;
382 } else { /* initiator */
383 if (ord_size > NES_MAX_IRD) {
384 nes_debug(NES_DBG_CM,
385 "%s: Unable to support the requested (ord =%u)\n",
386 __func__, ord_size);
387 return -EINVAL;
388 }
389 cm_node->ird_size = ord_size;
390
391 if (ird_size > NES_MAX_ORD) {
392 cm_node->ord_size = NES_MAX_ORD;
393 } else {
394 if (ird_size == 0 &&
395 (rtr_ctrl_ord & IETF_RDMA0_READ)) {
396 nes_debug(NES_DBG_CM,
397 "%s: Remote peer doesn't support RDMA0_READ (ird=%u)\n",
398 __func__, ird_size);
399 return -EINVAL;
400 } else {
401 cm_node->ord_size = ird_size;
402 }
403 }
404 }
405 }
406
407 if (rtr_ctrl_ord & IETF_RDMA0_READ) {
408 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
409
410 } else if (rtr_ctrl_ord & IETF_RDMA0_WRITE) {
411 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
412 } else { /* Not supported RDMA0 operation */
413 return -EINVAL;
414 }
415 break;
416 }
417 case IETF_MPA_V1:
418 default:
419 break;
420 }
421
422 /* copy entire MPA frame to our cm_node's frame */
423 memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
424
425 if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
426 *type = NES_MPA_REQUEST_REJECT;
427 return 0;
428 }
429
430
431 /**
432 * form_cm_frame - get a free packet and build empty frame Use
433 * node info to build.
434 */
435 static void form_cm_frame(struct sk_buff *skb,
436 struct nes_cm_node *cm_node, void *options, u32 optionsize,
437 void *data, u32 datasize, u8 flags)
438 {
439 struct tcphdr *tcph;
440 struct iphdr *iph;
441 struct ethhdr *ethh;
442 u8 *buf;
443 u16 packetsize = sizeof(*iph);
444
445 packetsize += sizeof(*tcph);
446 packetsize += optionsize + datasize;
447
448 skb_trim(skb, 0);
449 memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
450
451 buf = skb_put(skb, packetsize + ETH_HLEN);
452
453 ethh = (struct ethhdr *)buf;
454 buf += ETH_HLEN;
455
456 iph = (struct iphdr *)buf;
457 buf += sizeof(*iph);
458 tcph = (struct tcphdr *)buf;
459 skb_reset_mac_header(skb);
460 skb_set_network_header(skb, ETH_HLEN);
461 skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
462 buf += sizeof(*tcph);
463
464 skb->ip_summed = CHECKSUM_PARTIAL;
465 if (!(cm_node->netdev->features & NETIF_F_IP_CSUM))
466 skb->ip_summed = CHECKSUM_NONE;
467 skb->protocol = htons(0x800);
468 skb->data_len = 0;
469 skb->mac_len = ETH_HLEN;
470
471 memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
472 memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
473 ethh->h_proto = htons(0x0800);
474
475 iph->version = IPVERSION;
476 iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
477 iph->tos = 0;
478 iph->tot_len = htons(packetsize);
479 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
480
481 iph->frag_off = htons(0x4000);
482 iph->ttl = 0x40;
483 iph->protocol = 0x06; /* IPPROTO_TCP */
484
485 iph->saddr = htonl(cm_node->loc_addr);
486 iph->daddr = htonl(cm_node->rem_addr);
487
488 tcph->source = htons(cm_node->loc_port);
489 tcph->dest = htons(cm_node->rem_port);
490 tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
491
492 if (flags & SET_ACK) {
493 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
494 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
495 tcph->ack = 1;
496 } else {
497 tcph->ack_seq = 0;
498 }
499
500 if (flags & SET_SYN) {
501 cm_node->tcp_cntxt.loc_seq_num++;
502 tcph->syn = 1;
503 } else {
504 cm_node->tcp_cntxt.loc_seq_num += datasize;
505 }
506
507 if (flags & SET_FIN) {
508 cm_node->tcp_cntxt.loc_seq_num++;
509 tcph->fin = 1;
510 }
511
512 if (flags & SET_RST)
513 tcph->rst = 1;
514
515 tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
516 tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
517 tcph->urg_ptr = 0;
518 if (optionsize)
519 memcpy(buf, options, optionsize);
520 buf += optionsize;
521 if (datasize)
522 memcpy(buf, data, datasize);
523
524 skb_shinfo(skb)->nr_frags = 0;
525 cm_packets_created++;
526 }
527
528 /**
529 * print_core - dump a cm core
530 */
531 static void print_core(struct nes_cm_core *core)
532 {
533 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
534 nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
535 if (!core)
536 return;
537 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
538
539 nes_debug(NES_DBG_CM, "State : %u \n", core->state);
540
541 nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
542 nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
543
544 nes_debug(NES_DBG_CM, "core : %p \n", core);
545
546 nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
547 }
548
549 static void record_ird_ord(struct nes_cm_node *cm_node,
550 u16 conn_ird, u16 conn_ord)
551 {
552 if (conn_ird > NES_MAX_IRD)
553 conn_ird = NES_MAX_IRD;
554
555 if (conn_ord > NES_MAX_ORD)
556 conn_ord = NES_MAX_ORD;
557
558 cm_node->ird_size = conn_ird;
559 cm_node->ord_size = conn_ord;
560 }
561
562 /**
563 * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
564 */
565 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
566 u16 *buff_len, u8 *pci_mem, u8 mpa_key)
567 {
568 int ret = 0;
569
570 *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
571
572 switch (cm_node->mpa_frame_rev) {
573 case IETF_MPA_V1:
574 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
575 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
576 build_mpa_v1(cm_node, *start_buff, mpa_key);
577 break;
578 case IETF_MPA_V2:
579 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
580 build_mpa_v2(cm_node, *start_buff, mpa_key);
581 break;
582 default:
583 ret = -EINVAL;
584 }
585 return ret;
586 }
587
588 /**
589 * build_mpa_v2 - build a MPA V2 frame
590 */
591 static void build_mpa_v2(struct nes_cm_node *cm_node,
592 void *start_addr, u8 mpa_key)
593 {
594 struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
595 struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
596 u16 ctrl_ird;
597 u16 ctrl_ord;
598
599 /* initialize the upper 5 bytes of the frame */
600 build_mpa_v1(cm_node, start_addr, mpa_key);
601 mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
602 mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
603
604 /* initialize RTR msg */
605 if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
606 ctrl_ird = IETF_NO_IRD_ORD;
607 ctrl_ord = IETF_NO_IRD_ORD;
608 } else {
609 ctrl_ird = cm_node->ird_size & IETF_NO_IRD_ORD;
610 ctrl_ord = cm_node->ord_size & IETF_NO_IRD_ORD;
611 }
612 ctrl_ird |= IETF_PEER_TO_PEER;
613 ctrl_ird |= IETF_FLPDU_ZERO_LEN;
614
615 switch (mpa_key) {
616 case MPA_KEY_REQUEST:
617 ctrl_ord |= IETF_RDMA0_WRITE;
618 ctrl_ord |= IETF_RDMA0_READ;
619 break;
620 case MPA_KEY_REPLY:
621 switch (cm_node->send_rdma0_op) {
622 case SEND_RDMA_WRITE_ZERO:
623 ctrl_ord |= IETF_RDMA0_WRITE;
624 break;
625 case SEND_RDMA_READ_ZERO:
626 ctrl_ord |= IETF_RDMA0_READ;
627 break;
628 }
629 }
630 rtr_msg->ctrl_ird = htons(ctrl_ird);
631 rtr_msg->ctrl_ord = htons(ctrl_ord);
632 }
633
634 /**
635 * build_mpa_v1 - build a MPA V1 frame
636 */
637 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
638 {
639 struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
640
641 switch (mpa_key) {
642 case MPA_KEY_REQUEST:
643 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
644 break;
645 case MPA_KEY_REPLY:
646 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
647 break;
648 }
649 mpa_frame->flags = IETF_MPA_FLAGS_CRC;
650 mpa_frame->rev = cm_node->mpa_frame_rev;
651 mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
652 }
653
654 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
655 {
656 u64 u64temp;
657 struct nes_qp *nesqp = *nesqp_addr;
658 struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
659
660 u64temp = (unsigned long)nesqp->nesuqp_addr;
661 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
662 set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
663
664 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
665 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
666
667 switch (cm_node->send_rdma0_op) {
668 case SEND_RDMA_WRITE_ZERO:
669 nes_debug(NES_DBG_CM, "Sending first write.\n");
670 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
671 cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
672 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
673 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
674 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
675 break;
676
677 case SEND_RDMA_READ_ZERO:
678 default:
679 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO)
680 WARN(1, "Unsupported RDMA0 len operation=%u\n",
681 cm_node->send_rdma0_op);
682 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
683 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
684 cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
685 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
686 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
687 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
688 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
689 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
690 break;
691 }
692
693 if (nesqp->sq_kmapped) {
694 nesqp->sq_kmapped = 0;
695 kunmap(nesqp->page);
696 }
697
698 /*use the reserved spot on the WQ for the extra first WQE*/
699 nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
700 NES_QPCONTEXT_ORDIRD_WRPDU |
701 NES_QPCONTEXT_ORDIRD_ALSMM));
702 nesqp->skip_lsmm = 1;
703 nesqp->hwqp.sq_tail = 0;
704 }
705
706 /**
707 * schedule_nes_timer
708 * note - cm_node needs to be protected before calling this. Encase in:
709 * rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
710 */
711 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
712 enum nes_timer_type type, int send_retrans,
713 int close_when_complete)
714 {
715 unsigned long flags;
716 struct nes_cm_core *cm_core = cm_node->cm_core;
717 struct nes_timer_entry *new_send;
718 int ret = 0;
719
720 new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
721 if (!new_send)
722 return -ENOMEM;
723
724 /* new_send->timetosend = currenttime */
725 new_send->retrycount = NES_DEFAULT_RETRYS;
726 new_send->retranscount = NES_DEFAULT_RETRANS;
727 new_send->skb = skb;
728 new_send->timetosend = jiffies;
729 new_send->type = type;
730 new_send->netdev = cm_node->netdev;
731 new_send->send_retrans = send_retrans;
732 new_send->close_when_complete = close_when_complete;
733
734 if (type == NES_TIMER_TYPE_CLOSE) {
735 new_send->timetosend += (HZ / 10);
736 if (cm_node->recv_entry) {
737 kfree(new_send);
738 WARN_ON(1);
739 return -EINVAL;
740 }
741 cm_node->recv_entry = new_send;
742 }
743
744 if (type == NES_TIMER_TYPE_SEND) {
745 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
746 atomic_inc(&new_send->skb->users);
747 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
748 cm_node->send_entry = new_send;
749 add_ref_cm_node(cm_node);
750 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
751 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
752
753 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
754 if (ret != NETDEV_TX_OK) {
755 nes_debug(NES_DBG_CM, "Error sending packet %p "
756 "(jiffies = %lu)\n", new_send, jiffies);
757 new_send->timetosend = jiffies;
758 ret = NETDEV_TX_OK;
759 } else {
760 cm_packets_sent++;
761 if (!send_retrans) {
762 cleanup_retrans_entry(cm_node);
763 if (close_when_complete)
764 rem_ref_cm_node(cm_core, cm_node);
765 return ret;
766 }
767 }
768 }
769
770 if (!timer_pending(&cm_core->tcp_timer))
771 mod_timer(&cm_core->tcp_timer, new_send->timetosend);
772
773 return ret;
774 }
775
776 static void nes_retrans_expired(struct nes_cm_node *cm_node)
777 {
778 struct iw_cm_id *cm_id = cm_node->cm_id;
779 enum nes_cm_node_state state = cm_node->state;
780 cm_node->state = NES_CM_STATE_CLOSED;
781
782 switch (state) {
783 case NES_CM_STATE_SYN_RCVD:
784 case NES_CM_STATE_CLOSING:
785 rem_ref_cm_node(cm_node->cm_core, cm_node);
786 break;
787 case NES_CM_STATE_LAST_ACK:
788 case NES_CM_STATE_FIN_WAIT1:
789 if (cm_node->cm_id)
790 cm_id->rem_ref(cm_id);
791 send_reset(cm_node, NULL);
792 break;
793 default:
794 add_ref_cm_node(cm_node);
795 send_reset(cm_node, NULL);
796 create_event(cm_node, NES_CM_EVENT_ABORTED);
797 }
798 }
799
800 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
801 {
802 struct nes_timer_entry *recv_entry = cm_node->recv_entry;
803 struct iw_cm_id *cm_id = cm_node->cm_id;
804 struct nes_qp *nesqp;
805 unsigned long qplockflags;
806
807 if (!recv_entry)
808 return;
809 nesqp = (struct nes_qp *)recv_entry->skb;
810 if (nesqp) {
811 spin_lock_irqsave(&nesqp->lock, qplockflags);
812 if (nesqp->cm_id) {
813 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
814 "refcount = %d: HIT A "
815 "NES_TIMER_TYPE_CLOSE with something "
816 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
817 atomic_read(&nesqp->refcount));
818 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
819 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
820 nesqp->ibqp_state = IB_QPS_ERR;
821 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
822 nes_cm_disconn(nesqp);
823 } else {
824 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
825 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
826 "refcount = %d: HIT A "
827 "NES_TIMER_TYPE_CLOSE with nothing "
828 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
829 atomic_read(&nesqp->refcount));
830 }
831 } else if (rem_node) {
832 /* TIME_WAIT state */
833 rem_ref_cm_node(cm_node->cm_core, cm_node);
834 }
835 if (cm_node->cm_id)
836 cm_id->rem_ref(cm_id);
837 kfree(recv_entry);
838 cm_node->recv_entry = NULL;
839 }
840
841 /**
842 * nes_cm_timer_tick
843 */
844 static void nes_cm_timer_tick(unsigned long pass)
845 {
846 unsigned long flags;
847 unsigned long nexttimeout = jiffies + NES_LONG_TIME;
848 struct nes_cm_node *cm_node;
849 struct nes_timer_entry *send_entry, *recv_entry;
850 struct list_head *list_core_temp;
851 struct list_head *list_node;
852 struct nes_cm_core *cm_core = g_cm_core;
853 u32 settimer = 0;
854 unsigned long timetosend;
855 int ret = NETDEV_TX_OK;
856
857 struct list_head timer_list;
858
859 INIT_LIST_HEAD(&timer_list);
860 spin_lock_irqsave(&cm_core->ht_lock, flags);
861
862 list_for_each_safe(list_node, list_core_temp,
863 &cm_core->connected_nodes) {
864 cm_node = container_of(list_node, struct nes_cm_node, list);
865 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
866 add_ref_cm_node(cm_node);
867 list_add(&cm_node->timer_entry, &timer_list);
868 }
869 }
870 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
871
872 list_for_each_safe(list_node, list_core_temp, &timer_list) {
873 cm_node = container_of(list_node, struct nes_cm_node,
874 timer_entry);
875 recv_entry = cm_node->recv_entry;
876
877 if (recv_entry) {
878 if (time_after(recv_entry->timetosend, jiffies)) {
879 if (nexttimeout > recv_entry->timetosend ||
880 !settimer) {
881 nexttimeout = recv_entry->timetosend;
882 settimer = 1;
883 }
884 } else {
885 handle_recv_entry(cm_node, 1);
886 }
887 }
888
889 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
890 do {
891 send_entry = cm_node->send_entry;
892 if (!send_entry)
893 break;
894 if (time_after(send_entry->timetosend, jiffies)) {
895 if (cm_node->state != NES_CM_STATE_TSA) {
896 if ((nexttimeout >
897 send_entry->timetosend) ||
898 !settimer) {
899 nexttimeout =
900 send_entry->timetosend;
901 settimer = 1;
902 }
903 } else {
904 free_retrans_entry(cm_node);
905 }
906 break;
907 }
908
909 if ((cm_node->state == NES_CM_STATE_TSA) ||
910 (cm_node->state == NES_CM_STATE_CLOSED)) {
911 free_retrans_entry(cm_node);
912 break;
913 }
914
915 if (!send_entry->retranscount ||
916 !send_entry->retrycount) {
917 cm_packets_dropped++;
918 free_retrans_entry(cm_node);
919
920 spin_unlock_irqrestore(
921 &cm_node->retrans_list_lock, flags);
922 nes_retrans_expired(cm_node);
923 cm_node->state = NES_CM_STATE_CLOSED;
924 spin_lock_irqsave(&cm_node->retrans_list_lock,
925 flags);
926 break;
927 }
928 atomic_inc(&send_entry->skb->users);
929 cm_packets_retrans++;
930 nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
931 "for node %p, jiffies = %lu, time to send = "
932 "%lu, retranscount = %u, send_entry->seq_num = "
933 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
934 "0x%08X\n", send_entry, cm_node, jiffies,
935 send_entry->timetosend,
936 send_entry->retranscount,
937 send_entry->seq_num,
938 cm_node->tcp_cntxt.rem_ack_num);
939
940 spin_unlock_irqrestore(&cm_node->retrans_list_lock,
941 flags);
942 ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
943 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
944 if (ret != NETDEV_TX_OK) {
945 nes_debug(NES_DBG_CM, "rexmit failed for "
946 "node=%p\n", cm_node);
947 cm_packets_bounced++;
948 send_entry->retrycount--;
949 nexttimeout = jiffies + NES_SHORT_TIME;
950 settimer = 1;
951 break;
952 } else {
953 cm_packets_sent++;
954 }
955 nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
956 "%u, retry count = %u.\n",
957 send_entry->retranscount,
958 send_entry->retrycount);
959 if (send_entry->send_retrans) {
960 send_entry->retranscount--;
961 timetosend = (NES_RETRY_TIMEOUT <<
962 (NES_DEFAULT_RETRANS - send_entry->retranscount));
963
964 send_entry->timetosend = jiffies +
965 min(timetosend, NES_MAX_TIMEOUT);
966 if (nexttimeout > send_entry->timetosend ||
967 !settimer) {
968 nexttimeout = send_entry->timetosend;
969 settimer = 1;
970 }
971 } else {
972 int close_when_complete;
973 close_when_complete =
974 send_entry->close_when_complete;
975 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
976 cm_node, cm_node->state);
977 free_retrans_entry(cm_node);
978 if (close_when_complete)
979 rem_ref_cm_node(cm_node->cm_core,
980 cm_node);
981 }
982 } while (0);
983
984 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
985 rem_ref_cm_node(cm_node->cm_core, cm_node);
986 }
987
988 if (settimer) {
989 if (!timer_pending(&cm_core->tcp_timer))
990 mod_timer(&cm_core->tcp_timer, nexttimeout);
991 }
992 }
993
994
995 /**
996 * send_syn
997 */
998 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
999 struct sk_buff *skb)
1000 {
1001 int ret;
1002 int flags = SET_SYN;
1003 char optionsbuffer[sizeof(struct option_mss) +
1004 sizeof(struct option_windowscale) + sizeof(struct option_base) +
1005 TCP_OPTIONS_PADDING];
1006
1007 int optionssize = 0;
1008 /* Sending MSS option */
1009 union all_known_options *options;
1010
1011 if (!cm_node)
1012 return -EINVAL;
1013
1014 options = (union all_known_options *)&optionsbuffer[optionssize];
1015 options->as_mss.optionnum = OPTION_NUMBER_MSS;
1016 options->as_mss.length = sizeof(struct option_mss);
1017 options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1018 optionssize += sizeof(struct option_mss);
1019
1020 options = (union all_known_options *)&optionsbuffer[optionssize];
1021 options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1022 options->as_windowscale.length = sizeof(struct option_windowscale);
1023 options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1024 optionssize += sizeof(struct option_windowscale);
1025
1026 if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
1027 options = (union all_known_options *)&optionsbuffer[optionssize];
1028 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
1029 options->as_base.length = sizeof(struct option_base);
1030 optionssize += sizeof(struct option_base);
1031 /* we need the size to be a multiple of 4 */
1032 options = (union all_known_options *)&optionsbuffer[optionssize];
1033 options->as_end = 1;
1034 optionssize += 1;
1035 options = (union all_known_options *)&optionsbuffer[optionssize];
1036 options->as_end = 1;
1037 optionssize += 1;
1038 }
1039
1040 options = (union all_known_options *)&optionsbuffer[optionssize];
1041 options->as_end = OPTION_NUMBER_END;
1042 optionssize += 1;
1043
1044 if (!skb)
1045 skb = dev_alloc_skb(MAX_CM_BUFFER);
1046 if (!skb) {
1047 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1048 return -1;
1049 }
1050
1051 if (sendack)
1052 flags |= SET_ACK;
1053
1054 form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1055 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1056
1057 return ret;
1058 }
1059
1060
1061 /**
1062 * send_reset
1063 */
1064 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1065 {
1066 int ret;
1067 int flags = SET_RST | SET_ACK;
1068
1069 if (!skb)
1070 skb = dev_alloc_skb(MAX_CM_BUFFER);
1071 if (!skb) {
1072 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1073 return -ENOMEM;
1074 }
1075
1076 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1077 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1078
1079 return ret;
1080 }
1081
1082
1083 /**
1084 * send_ack
1085 */
1086 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1087 {
1088 int ret;
1089
1090 if (!skb)
1091 skb = dev_alloc_skb(MAX_CM_BUFFER);
1092
1093 if (!skb) {
1094 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1095 return -1;
1096 }
1097
1098 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1099 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1100
1101 return ret;
1102 }
1103
1104
1105 /**
1106 * send_fin
1107 */
1108 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1109 {
1110 int ret;
1111
1112 /* if we didn't get a frame get one */
1113 if (!skb)
1114 skb = dev_alloc_skb(MAX_CM_BUFFER);
1115
1116 if (!skb) {
1117 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1118 return -1;
1119 }
1120
1121 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1122 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1123
1124 return ret;
1125 }
1126
1127
1128 /**
1129 * find_node - find a cm node that matches the reference cm node
1130 */
1131 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1132 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1133 {
1134 unsigned long flags;
1135 struct list_head *hte;
1136 struct nes_cm_node *cm_node;
1137
1138 /* get a handle on the hte */
1139 hte = &cm_core->connected_nodes;
1140
1141 /* walk list and find cm_node associated with this session ID */
1142 spin_lock_irqsave(&cm_core->ht_lock, flags);
1143 list_for_each_entry(cm_node, hte, list) {
1144 /* compare quad, return node handle if a match */
1145 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1146 cm_node->loc_addr, cm_node->loc_port,
1147 loc_addr, loc_port,
1148 cm_node->rem_addr, cm_node->rem_port,
1149 rem_addr, rem_port);
1150 if ((cm_node->loc_addr == loc_addr) &&
1151 (cm_node->loc_port == loc_port) &&
1152 (cm_node->rem_addr == rem_addr) &&
1153 (cm_node->rem_port == rem_port)) {
1154 add_ref_cm_node(cm_node);
1155 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1156 return cm_node;
1157 }
1158 }
1159 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1160
1161 /* no owner node */
1162 return NULL;
1163 }
1164
1165
1166 /**
1167 * find_listener - find a cm node listening on this addr-port pair
1168 */
1169 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1170 nes_addr_t dst_addr, u16 dst_port,
1171 enum nes_cm_listener_state listener_state)
1172 {
1173 unsigned long flags;
1174 struct nes_cm_listener *listen_node;
1175 nes_addr_t listen_addr;
1176 u16 listen_port;
1177
1178 /* walk list and find cm_node associated with this session ID */
1179 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1180 list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1181 listen_addr = listen_node->loc_addr;
1182 listen_port = listen_node->loc_port;
1183
1184 /* compare node pair, return node handle if a match */
1185 if (((listen_addr == dst_addr) ||
1186 listen_addr == 0x00000000) &&
1187 (listen_port == dst_port) &&
1188 (listener_state & listen_node->listener_state)) {
1189 atomic_inc(&listen_node->ref_count);
1190 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1191 return listen_node;
1192 }
1193 }
1194 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1195
1196 /* no listener */
1197 return NULL;
1198 }
1199
1200 /**
1201 * add_hte_node - add a cm node to the hash table
1202 */
1203 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1204 {
1205 unsigned long flags;
1206 struct list_head *hte;
1207
1208 if (!cm_node || !cm_core)
1209 return -EINVAL;
1210
1211 nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1212 cm_node);
1213
1214 spin_lock_irqsave(&cm_core->ht_lock, flags);
1215
1216 /* get a handle on the hash table element (list head for this slot) */
1217 hte = &cm_core->connected_nodes;
1218 list_add_tail(&cm_node->list, hte);
1219 atomic_inc(&cm_core->ht_node_cnt);
1220
1221 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1222
1223 return 0;
1224 }
1225
1226
1227 /**
1228 * mini_cm_dec_refcnt_listen
1229 */
1230 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1231 struct nes_cm_listener *listener, int free_hanging_nodes)
1232 {
1233 int ret = -EINVAL;
1234 int err = 0;
1235 unsigned long flags;
1236 struct list_head *list_pos = NULL;
1237 struct list_head *list_temp = NULL;
1238 struct nes_cm_node *cm_node = NULL;
1239 struct list_head reset_list;
1240
1241 nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1242 "refcnt=%d\n", listener, free_hanging_nodes,
1243 atomic_read(&listener->ref_count));
1244 /* free non-accelerated child nodes for this listener */
1245 INIT_LIST_HEAD(&reset_list);
1246 if (free_hanging_nodes) {
1247 spin_lock_irqsave(&cm_core->ht_lock, flags);
1248 list_for_each_safe(list_pos, list_temp,
1249 &g_cm_core->connected_nodes) {
1250 cm_node = container_of(list_pos, struct nes_cm_node,
1251 list);
1252 if ((cm_node->listener == listener) &&
1253 (!cm_node->accelerated)) {
1254 add_ref_cm_node(cm_node);
1255 list_add(&cm_node->reset_entry, &reset_list);
1256 }
1257 }
1258 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1259 }
1260
1261 list_for_each_safe(list_pos, list_temp, &reset_list) {
1262 cm_node = container_of(list_pos, struct nes_cm_node,
1263 reset_entry);
1264 {
1265 struct nes_cm_node *loopback = cm_node->loopbackpartner;
1266 enum nes_cm_node_state old_state;
1267 if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1268 rem_ref_cm_node(cm_node->cm_core, cm_node);
1269 } else {
1270 if (!loopback) {
1271 cleanup_retrans_entry(cm_node);
1272 err = send_reset(cm_node, NULL);
1273 if (err) {
1274 cm_node->state =
1275 NES_CM_STATE_CLOSED;
1276 WARN_ON(1);
1277 } else {
1278 old_state = cm_node->state;
1279 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1280 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1281 rem_ref_cm_node(
1282 cm_node->cm_core,
1283 cm_node);
1284 }
1285 } else {
1286 struct nes_cm_event event;
1287
1288 event.cm_node = loopback;
1289 event.cm_info.rem_addr =
1290 loopback->rem_addr;
1291 event.cm_info.loc_addr =
1292 loopback->loc_addr;
1293 event.cm_info.rem_port =
1294 loopback->rem_port;
1295 event.cm_info.loc_port =
1296 loopback->loc_port;
1297 event.cm_info.cm_id = loopback->cm_id;
1298 add_ref_cm_node(loopback);
1299 loopback->state = NES_CM_STATE_CLOSED;
1300 cm_event_connect_error(&event);
1301 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1302
1303 rem_ref_cm_node(cm_node->cm_core,
1304 cm_node);
1305
1306 }
1307 }
1308 }
1309 }
1310
1311 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1312 if (!atomic_dec_return(&listener->ref_count)) {
1313 list_del(&listener->list);
1314
1315 /* decrement our listen node count */
1316 atomic_dec(&cm_core->listen_node_cnt);
1317
1318 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1319
1320 if (listener->nesvnic) {
1321 nes_manage_apbvt(listener->nesvnic,
1322 listener->loc_port,
1323 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn),
1324 NES_MANAGE_APBVT_DEL);
1325
1326 nes_debug(NES_DBG_NLMSG,
1327 "Delete APBVT loc_port = %04X\n",
1328 listener->loc_port);
1329 }
1330
1331 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1332
1333 kfree(listener);
1334 listener = NULL;
1335 ret = 0;
1336 atomic_inc(&cm_listens_destroyed);
1337 } else {
1338 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1339 }
1340 if (listener) {
1341 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1342 nes_debug(NES_DBG_CM, "destroying listener (%p)"
1343 " with non-zero pending accepts=%u\n",
1344 listener, atomic_read(&listener->pend_accepts_cnt));
1345 }
1346
1347 return ret;
1348 }
1349
1350
1351 /**
1352 * mini_cm_del_listen
1353 */
1354 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1355 struct nes_cm_listener *listener)
1356 {
1357 listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1358 listener->cm_id = NULL; /* going to be destroyed pretty soon */
1359 return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1360 }
1361
1362
1363 /**
1364 * mini_cm_accelerated
1365 */
1366 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1367 struct nes_cm_node *cm_node)
1368 {
1369 cm_node->accelerated = 1;
1370
1371 if (cm_node->accept_pend) {
1372 BUG_ON(!cm_node->listener);
1373 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1374 cm_node->accept_pend = 0;
1375 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1376 }
1377
1378 if (!timer_pending(&cm_core->tcp_timer))
1379 mod_timer(&cm_core->tcp_timer, (jiffies + NES_SHORT_TIME));
1380
1381 return 0;
1382 }
1383
1384
1385 /**
1386 * nes_addr_resolve_neigh
1387 */
1388 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1389 {
1390 struct rtable *rt;
1391 struct neighbour *neigh;
1392 int rc = arpindex;
1393 struct net_device *netdev;
1394 struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1395 __be32 dst_ipaddr = htonl(dst_ip);
1396
1397 rt = ip_route_output(&init_net, dst_ipaddr, nesvnic->local_ipaddr, 0, 0);
1398 if (IS_ERR(rt)) {
1399 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1400 __func__, dst_ip);
1401 return rc;
1402 }
1403
1404 if (netif_is_bond_slave(nesvnic->netdev))
1405 netdev = netdev_master_upper_dev_get(nesvnic->netdev);
1406 else
1407 netdev = nesvnic->netdev;
1408
1409 neigh = dst_neigh_lookup(&rt->dst, &dst_ipaddr);
1410
1411 rcu_read_lock();
1412 if (neigh) {
1413 if (neigh->nud_state & NUD_VALID) {
1414 nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1415 " is %pM, Gateway is 0x%08X \n", dst_ip,
1416 neigh->ha, ntohl(rt->rt_gateway));
1417
1418 if (arpindex >= 0) {
1419 if (ether_addr_equal(nesadapter->arp_table[arpindex].mac_addr, neigh->ha)) {
1420 /* Mac address same as in nes_arp_table */
1421 goto out;
1422 }
1423
1424 nes_manage_arp_cache(nesvnic->netdev,
1425 nesadapter->arp_table[arpindex].mac_addr,
1426 dst_ip, NES_ARP_DELETE);
1427 }
1428
1429 nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1430 dst_ip, NES_ARP_ADD);
1431 rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1432 NES_ARP_RESOLVE);
1433 } else {
1434 neigh_event_send(neigh, NULL);
1435 }
1436 }
1437 out:
1438 rcu_read_unlock();
1439
1440 if (neigh)
1441 neigh_release(neigh);
1442
1443 ip_rt_put(rt);
1444 return rc;
1445 }
1446
1447 /**
1448 * make_cm_node - create a new instance of a cm node
1449 */
1450 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1451 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1452 struct nes_cm_listener *listener)
1453 {
1454 struct nes_cm_node *cm_node;
1455 struct timespec ts;
1456 int oldarpindex = 0;
1457 int arpindex = 0;
1458 struct nes_device *nesdev;
1459 struct nes_adapter *nesadapter;
1460
1461 /* create an hte and cm_node for this instance */
1462 cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1463 if (!cm_node)
1464 return NULL;
1465
1466 /* set our node specific transport info */
1467 if (listener) {
1468 cm_node->loc_addr = listener->loc_addr;
1469 cm_node->loc_port = listener->loc_port;
1470 } else {
1471 cm_node->loc_addr = cm_info->loc_addr;
1472 cm_node->loc_port = cm_info->loc_port;
1473 }
1474 cm_node->rem_addr = cm_info->rem_addr;
1475 cm_node->rem_port = cm_info->rem_port;
1476
1477 cm_node->mpa_frame_rev = mpa_version;
1478 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1479 cm_node->mpav2_ird_ord = 0;
1480 cm_node->ird_size = 0;
1481 cm_node->ord_size = 0;
1482
1483 nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1484 &cm_node->loc_addr, cm_node->loc_port,
1485 &cm_node->rem_addr, cm_node->rem_port);
1486 cm_node->listener = listener;
1487 if (listener)
1488 cm_node->tos = listener->tos;
1489 cm_node->netdev = nesvnic->netdev;
1490 cm_node->cm_id = cm_info->cm_id;
1491 memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1492
1493 nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1494 cm_node->cm_id);
1495
1496 spin_lock_init(&cm_node->retrans_list_lock);
1497
1498 cm_node->loopbackpartner = NULL;
1499 atomic_set(&cm_node->ref_count, 1);
1500 /* associate our parent CM core */
1501 cm_node->cm_core = cm_core;
1502 cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1503 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1504 cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1505 NES_CM_DEFAULT_RCV_WND_SCALE;
1506 ts = current_kernel_time();
1507 cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1508 cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1509 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1510 cm_node->tcp_cntxt.rcv_nxt = 0;
1511 /* get a unique session ID , add thread_id to an upcounter to handle race */
1512 atomic_inc(&cm_core->node_cnt);
1513 cm_node->conn_type = cm_info->conn_type;
1514 cm_node->apbvt_set = 0;
1515 cm_node->accept_pend = 0;
1516
1517 cm_node->nesvnic = nesvnic;
1518 /* get some device handles, for arp lookup */
1519 nesdev = nesvnic->nesdev;
1520 nesadapter = nesdev->nesadapter;
1521
1522 cm_node->loopbackpartner = NULL;
1523
1524 /* get the mac addr for the remote node */
1525 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr,
1526 NULL, NES_ARP_RESOLVE);
1527 arpindex = nes_addr_resolve_neigh(nesvnic, cm_node->rem_addr,
1528 oldarpindex);
1529 if (arpindex < 0) {
1530 kfree(cm_node);
1531 return NULL;
1532 }
1533
1534 /* copy the mac addr to node context */
1535 memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1536 nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1537 cm_node->rem_mac);
1538
1539 add_hte_node(cm_core, cm_node);
1540 atomic_inc(&cm_nodes_created);
1541
1542 return cm_node;
1543 }
1544
1545
1546 /**
1547 * add_ref_cm_node - destroy an instance of a cm node
1548 */
1549 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1550 {
1551 atomic_inc(&cm_node->ref_count);
1552 return 0;
1553 }
1554
1555
1556 /**
1557 * rem_ref_cm_node - destroy an instance of a cm node
1558 */
1559 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1560 struct nes_cm_node *cm_node)
1561 {
1562 unsigned long flags;
1563 struct nes_qp *nesqp;
1564
1565 if (!cm_node)
1566 return -EINVAL;
1567
1568 spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1569 if (atomic_dec_return(&cm_node->ref_count)) {
1570 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1571 return 0;
1572 }
1573 list_del(&cm_node->list);
1574 atomic_dec(&cm_core->ht_node_cnt);
1575 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1576
1577 /* if the node is destroyed before connection was accelerated */
1578 if (!cm_node->accelerated && cm_node->accept_pend) {
1579 BUG_ON(!cm_node->listener);
1580 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1581 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1582 }
1583 WARN_ON(cm_node->send_entry);
1584 if (cm_node->recv_entry)
1585 handle_recv_entry(cm_node, 0);
1586 if (cm_node->listener) {
1587 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1588 } else {
1589 if (cm_node->apbvt_set && cm_node->nesvnic) {
1590 nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1591 PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1592 NES_MANAGE_APBVT_DEL);
1593 }
1594 nes_debug(NES_DBG_NLMSG, "Delete APBVT loc_port = %04X\n",
1595 cm_node->loc_port);
1596 }
1597
1598 atomic_dec(&cm_core->node_cnt);
1599 atomic_inc(&cm_nodes_destroyed);
1600 nesqp = cm_node->nesqp;
1601 if (nesqp) {
1602 nesqp->cm_node = NULL;
1603 nes_rem_ref(&nesqp->ibqp);
1604 cm_node->nesqp = NULL;
1605 }
1606
1607 kfree(cm_node);
1608 return 0;
1609 }
1610
1611 /**
1612 * process_options
1613 */
1614 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1615 u32 optionsize, u32 syn_packet)
1616 {
1617 u32 tmp;
1618 u32 offset = 0;
1619 union all_known_options *all_options;
1620 char got_mss_option = 0;
1621
1622 while (offset < optionsize) {
1623 all_options = (union all_known_options *)(optionsloc + offset);
1624 switch (all_options->as_base.optionnum) {
1625 case OPTION_NUMBER_END:
1626 offset = optionsize;
1627 break;
1628 case OPTION_NUMBER_NONE:
1629 offset += 1;
1630 continue;
1631 case OPTION_NUMBER_MSS:
1632 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1633 "Size: %d\n", __func__,
1634 all_options->as_mss.length, offset, optionsize);
1635 got_mss_option = 1;
1636 if (all_options->as_mss.length != 4) {
1637 return 1;
1638 } else {
1639 tmp = ntohs(all_options->as_mss.mss);
1640 if (tmp > 0 && tmp <
1641 cm_node->tcp_cntxt.mss)
1642 cm_node->tcp_cntxt.mss = tmp;
1643 }
1644 break;
1645 case OPTION_NUMBER_WINDOW_SCALE:
1646 cm_node->tcp_cntxt.snd_wscale =
1647 all_options->as_windowscale.shiftcount;
1648 break;
1649 default:
1650 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1651 all_options->as_base.optionnum);
1652 break;
1653 }
1654 offset += all_options->as_base.length;
1655 }
1656 if ((!got_mss_option) && (syn_packet))
1657 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1658 return 0;
1659 }
1660
1661 static void drop_packet(struct sk_buff *skb)
1662 {
1663 atomic_inc(&cm_accel_dropped_pkts);
1664 dev_kfree_skb_any(skb);
1665 }
1666
1667 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1668 {
1669 nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1670 "refcnt=%d\n", cm_node, cm_node->state,
1671 atomic_read(&cm_node->ref_count));
1672 switch (cm_node->state) {
1673 case NES_CM_STATE_SYN_RCVD:
1674 case NES_CM_STATE_SYN_SENT:
1675 case NES_CM_STATE_ESTABLISHED:
1676 case NES_CM_STATE_MPAREJ_RCVD:
1677 cm_node->tcp_cntxt.rcv_nxt++;
1678 cleanup_retrans_entry(cm_node);
1679 cm_node->state = NES_CM_STATE_LAST_ACK;
1680 send_fin(cm_node, NULL);
1681 break;
1682 case NES_CM_STATE_MPAREQ_SENT:
1683 create_event(cm_node, NES_CM_EVENT_ABORTED);
1684 cm_node->tcp_cntxt.rcv_nxt++;
1685 cleanup_retrans_entry(cm_node);
1686 cm_node->state = NES_CM_STATE_CLOSED;
1687 add_ref_cm_node(cm_node);
1688 send_reset(cm_node, NULL);
1689 break;
1690 case NES_CM_STATE_FIN_WAIT1:
1691 cm_node->tcp_cntxt.rcv_nxt++;
1692 cleanup_retrans_entry(cm_node);
1693 cm_node->state = NES_CM_STATE_CLOSING;
1694 send_ack(cm_node, NULL);
1695 /* Wait for ACK as this is simultaneous close..
1696 * After we receive ACK, do not send anything..
1697 * Just rm the node.. Done.. */
1698 break;
1699 case NES_CM_STATE_FIN_WAIT2:
1700 cm_node->tcp_cntxt.rcv_nxt++;
1701 cleanup_retrans_entry(cm_node);
1702 cm_node->state = NES_CM_STATE_TIME_WAIT;
1703 send_ack(cm_node, NULL);
1704 schedule_nes_timer(cm_node, NULL, NES_TIMER_TYPE_CLOSE, 1, 0);
1705 break;
1706 case NES_CM_STATE_TIME_WAIT:
1707 cm_node->tcp_cntxt.rcv_nxt++;
1708 cleanup_retrans_entry(cm_node);
1709 cm_node->state = NES_CM_STATE_CLOSED;
1710 rem_ref_cm_node(cm_node->cm_core, cm_node);
1711 break;
1712 case NES_CM_STATE_TSA:
1713 default:
1714 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1715 cm_node, cm_node->state);
1716 break;
1717 }
1718 }
1719
1720
1721 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1722 struct tcphdr *tcph)
1723 {
1724
1725 int reset = 0; /* whether to send reset in case of err.. */
1726 atomic_inc(&cm_resets_recvd);
1727 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1728 " refcnt=%d\n", cm_node, cm_node->state,
1729 atomic_read(&cm_node->ref_count));
1730 cleanup_retrans_entry(cm_node);
1731 switch (cm_node->state) {
1732 case NES_CM_STATE_SYN_SENT:
1733 case NES_CM_STATE_MPAREQ_SENT:
1734 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1735 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1736 cm_node->listener, cm_node->state);
1737 switch (cm_node->mpa_frame_rev) {
1738 case IETF_MPA_V2:
1739 cm_node->mpa_frame_rev = IETF_MPA_V1;
1740 /* send a syn and goto syn sent state */
1741 cm_node->state = NES_CM_STATE_SYN_SENT;
1742 if (send_syn(cm_node, 0, NULL)) {
1743 active_open_err(cm_node, skb, reset);
1744 }
1745 break;
1746 case IETF_MPA_V1:
1747 default:
1748 active_open_err(cm_node, skb, reset);
1749 break;
1750 }
1751 break;
1752 case NES_CM_STATE_MPAREQ_RCVD:
1753 atomic_inc(&cm_node->passive_state);
1754 dev_kfree_skb_any(skb);
1755 break;
1756 case NES_CM_STATE_ESTABLISHED:
1757 case NES_CM_STATE_SYN_RCVD:
1758 case NES_CM_STATE_LISTENING:
1759 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1760 passive_open_err(cm_node, skb, reset);
1761 break;
1762 case NES_CM_STATE_TSA:
1763 active_open_err(cm_node, skb, reset);
1764 break;
1765 case NES_CM_STATE_CLOSED:
1766 drop_packet(skb);
1767 break;
1768 case NES_CM_STATE_FIN_WAIT2:
1769 case NES_CM_STATE_FIN_WAIT1:
1770 case NES_CM_STATE_LAST_ACK:
1771 cm_node->cm_id->rem_ref(cm_node->cm_id);
1772 case NES_CM_STATE_TIME_WAIT:
1773 cm_node->state = NES_CM_STATE_CLOSED;
1774 rem_ref_cm_node(cm_node->cm_core, cm_node);
1775 drop_packet(skb);
1776 break;
1777 default:
1778 drop_packet(skb);
1779 break;
1780 }
1781 }
1782
1783
1784 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1785 {
1786 int ret = 0;
1787 int datasize = skb->len;
1788 u8 *dataloc = skb->data;
1789
1790 enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1791 u32 res_type;
1792
1793 ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1794 if (ret) {
1795 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1796 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1797 nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1798 "cm_node=%p listener=%p state=%d\n", __func__,
1799 __LINE__, cm_node, cm_node->listener,
1800 cm_node->state);
1801 active_open_err(cm_node, skb, 1);
1802 } else {
1803 passive_open_err(cm_node, skb, 1);
1804 }
1805 return;
1806 }
1807
1808 switch (cm_node->state) {
1809 case NES_CM_STATE_ESTABLISHED:
1810 if (res_type == NES_MPA_REQUEST_REJECT)
1811 /*BIG problem as we are receiving the MPA.. So should
1812 * not be REJECT.. This is Passive Open.. We can
1813 * only receive it Reject for Active Open...*/
1814 WARN_ON(1);
1815 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1816 type = NES_CM_EVENT_MPA_REQ;
1817 atomic_set(&cm_node->passive_state,
1818 NES_PASSIVE_STATE_INDICATED);
1819 break;
1820 case NES_CM_STATE_MPAREQ_SENT:
1821 cleanup_retrans_entry(cm_node);
1822 if (res_type == NES_MPA_REQUEST_REJECT) {
1823 type = NES_CM_EVENT_MPA_REJECT;
1824 cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1825 } else {
1826 type = NES_CM_EVENT_CONNECTED;
1827 cm_node->state = NES_CM_STATE_TSA;
1828 }
1829
1830 break;
1831 default:
1832 WARN_ON(1);
1833 break;
1834 }
1835 dev_kfree_skb_any(skb);
1836 create_event(cm_node, type);
1837 }
1838
1839 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1840 {
1841 switch (cm_node->state) {
1842 case NES_CM_STATE_SYN_SENT:
1843 case NES_CM_STATE_MPAREQ_SENT:
1844 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1845 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1846 cm_node->listener, cm_node->state);
1847 active_open_err(cm_node, skb, 1);
1848 break;
1849 case NES_CM_STATE_ESTABLISHED:
1850 case NES_CM_STATE_SYN_RCVD:
1851 passive_open_err(cm_node, skb, 1);
1852 break;
1853 case NES_CM_STATE_TSA:
1854 default:
1855 drop_packet(skb);
1856 }
1857 }
1858
1859 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1860 struct sk_buff *skb)
1861 {
1862 int err;
1863
1864 err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1865 if (err)
1866 active_open_err(cm_node, skb, 1);
1867
1868 return err;
1869 }
1870
1871 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1872 struct sk_buff *skb)
1873 {
1874 int err = 0;
1875 u32 seq;
1876 u32 ack_seq;
1877 u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1878 u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1879 u32 rcv_wnd;
1880
1881 seq = ntohl(tcph->seq);
1882 ack_seq = ntohl(tcph->ack_seq);
1883 rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1884 if (ack_seq != loc_seq_num)
1885 err = 1;
1886 else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1887 err = 1;
1888 if (err) {
1889 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1890 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1891 cm_node->listener, cm_node->state);
1892 indicate_pkt_err(cm_node, skb);
1893 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1894 "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1895 rcv_wnd);
1896 }
1897 return err;
1898 }
1899
1900 /*
1901 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1902 * is created with a listener or it may comein as rexmitted packet which in
1903 * that case will be just dropped.
1904 */
1905 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1906 struct tcphdr *tcph)
1907 {
1908 int ret;
1909 u32 inc_sequence;
1910 int optionsize;
1911
1912 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1913 skb_trim(skb, 0);
1914 inc_sequence = ntohl(tcph->seq);
1915
1916 switch (cm_node->state) {
1917 case NES_CM_STATE_SYN_SENT:
1918 case NES_CM_STATE_MPAREQ_SENT:
1919 /* Rcvd syn on active open connection*/
1920 active_open_err(cm_node, skb, 1);
1921 break;
1922 case NES_CM_STATE_LISTENING:
1923 /* Passive OPEN */
1924 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1925 cm_node->listener->backlog) {
1926 nes_debug(NES_DBG_CM, "drop syn due to backlog "
1927 "pressure \n");
1928 cm_backlog_drops++;
1929 passive_open_err(cm_node, skb, 0);
1930 break;
1931 }
1932 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1933 1);
1934 if (ret) {
1935 passive_open_err(cm_node, skb, 0);
1936 /* drop pkt */
1937 break;
1938 }
1939 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1940 BUG_ON(cm_node->send_entry);
1941 cm_node->accept_pend = 1;
1942 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1943
1944 cm_node->state = NES_CM_STATE_SYN_RCVD;
1945 send_syn(cm_node, 1, skb);
1946 break;
1947 case NES_CM_STATE_CLOSED:
1948 cleanup_retrans_entry(cm_node);
1949 add_ref_cm_node(cm_node);
1950 send_reset(cm_node, skb);
1951 break;
1952 case NES_CM_STATE_TSA:
1953 case NES_CM_STATE_ESTABLISHED:
1954 case NES_CM_STATE_FIN_WAIT1:
1955 case NES_CM_STATE_FIN_WAIT2:
1956 case NES_CM_STATE_MPAREQ_RCVD:
1957 case NES_CM_STATE_LAST_ACK:
1958 case NES_CM_STATE_CLOSING:
1959 case NES_CM_STATE_UNKNOWN:
1960 default:
1961 drop_packet(skb);
1962 break;
1963 }
1964 }
1965
1966 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1967 struct tcphdr *tcph)
1968 {
1969 int ret;
1970 u32 inc_sequence;
1971 int optionsize;
1972
1973 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1974 skb_trim(skb, 0);
1975 inc_sequence = ntohl(tcph->seq);
1976 switch (cm_node->state) {
1977 case NES_CM_STATE_SYN_SENT:
1978 cleanup_retrans_entry(cm_node);
1979 /* active open */
1980 if (check_syn(cm_node, tcph, skb))
1981 return;
1982 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1983 /* setup options */
1984 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1985 if (ret) {
1986 nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1987 cm_node);
1988 break;
1989 }
1990 cleanup_retrans_entry(cm_node);
1991 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1992 send_mpa_request(cm_node, skb);
1993 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1994 break;
1995 case NES_CM_STATE_MPAREQ_RCVD:
1996 /* passive open, so should not be here */
1997 passive_open_err(cm_node, skb, 1);
1998 break;
1999 case NES_CM_STATE_LISTENING:
2000 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2001 cleanup_retrans_entry(cm_node);
2002 cm_node->state = NES_CM_STATE_CLOSED;
2003 send_reset(cm_node, skb);
2004 break;
2005 case NES_CM_STATE_CLOSED:
2006 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2007 cleanup_retrans_entry(cm_node);
2008 add_ref_cm_node(cm_node);
2009 send_reset(cm_node, skb);
2010 break;
2011 case NES_CM_STATE_ESTABLISHED:
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_TSA:
2016 case NES_CM_STATE_CLOSING:
2017 case NES_CM_STATE_UNKNOWN:
2018 case NES_CM_STATE_MPAREQ_SENT:
2019 default:
2020 drop_packet(skb);
2021 break;
2022 }
2023 }
2024
2025 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
2026 struct tcphdr *tcph)
2027 {
2028 int datasize = 0;
2029 u32 inc_sequence;
2030 int ret = 0;
2031 int optionsize;
2032
2033 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2034
2035 if (check_seq(cm_node, tcph, skb))
2036 return -EINVAL;
2037
2038 skb_pull(skb, tcph->doff << 2);
2039 inc_sequence = ntohl(tcph->seq);
2040 datasize = skb->len;
2041 switch (cm_node->state) {
2042 case NES_CM_STATE_SYN_RCVD:
2043 /* Passive OPEN */
2044 cleanup_retrans_entry(cm_node);
2045 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
2046 if (ret)
2047 break;
2048 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2049 cm_node->state = NES_CM_STATE_ESTABLISHED;
2050 if (datasize) {
2051 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2052 handle_rcv_mpa(cm_node, skb);
2053 } else { /* rcvd ACK only */
2054 dev_kfree_skb_any(skb);
2055 }
2056 break;
2057 case NES_CM_STATE_ESTABLISHED:
2058 /* Passive OPEN */
2059 cleanup_retrans_entry(cm_node);
2060 if (datasize) {
2061 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2062 handle_rcv_mpa(cm_node, skb);
2063 } else {
2064 drop_packet(skb);
2065 }
2066 break;
2067 case NES_CM_STATE_MPAREQ_SENT:
2068 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2069 if (datasize) {
2070 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2071 handle_rcv_mpa(cm_node, skb);
2072 } else { /* Could be just an ack pkt.. */
2073 dev_kfree_skb_any(skb);
2074 }
2075 break;
2076 case NES_CM_STATE_LISTENING:
2077 cleanup_retrans_entry(cm_node);
2078 cm_node->state = NES_CM_STATE_CLOSED;
2079 send_reset(cm_node, skb);
2080 break;
2081 case NES_CM_STATE_CLOSED:
2082 cleanup_retrans_entry(cm_node);
2083 add_ref_cm_node(cm_node);
2084 send_reset(cm_node, skb);
2085 break;
2086 case NES_CM_STATE_LAST_ACK:
2087 case NES_CM_STATE_CLOSING:
2088 cleanup_retrans_entry(cm_node);
2089 cm_node->state = NES_CM_STATE_CLOSED;
2090 cm_node->cm_id->rem_ref(cm_node->cm_id);
2091 rem_ref_cm_node(cm_node->cm_core, cm_node);
2092 drop_packet(skb);
2093 break;
2094 case NES_CM_STATE_FIN_WAIT1:
2095 cleanup_retrans_entry(cm_node);
2096 drop_packet(skb);
2097 cm_node->state = NES_CM_STATE_FIN_WAIT2;
2098 break;
2099 case NES_CM_STATE_SYN_SENT:
2100 case NES_CM_STATE_FIN_WAIT2:
2101 case NES_CM_STATE_TSA:
2102 case NES_CM_STATE_MPAREQ_RCVD:
2103 case NES_CM_STATE_UNKNOWN:
2104 default:
2105 cleanup_retrans_entry(cm_node);
2106 drop_packet(skb);
2107 break;
2108 }
2109 return ret;
2110 }
2111
2112
2113
2114 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2115 struct sk_buff *skb, int optionsize, int passive)
2116 {
2117 u8 *optionsloc = (u8 *)&tcph[1];
2118
2119 if (optionsize) {
2120 if (process_options(cm_node, optionsloc, optionsize,
2121 (u32)tcph->syn)) {
2122 nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2123 __func__, cm_node);
2124 if (passive)
2125 passive_open_err(cm_node, skb, 1);
2126 else
2127 active_open_err(cm_node, skb, 1);
2128 return 1;
2129 }
2130 }
2131
2132 cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2133 cm_node->tcp_cntxt.snd_wscale;
2134
2135 if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2136 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2137 return 0;
2138 }
2139
2140 /*
2141 * active_open_err() will send reset() if flag set..
2142 * It will also send ABORT event.
2143 */
2144 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2145 int reset)
2146 {
2147 cleanup_retrans_entry(cm_node);
2148 if (reset) {
2149 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2150 "state=%d\n", cm_node, cm_node->state);
2151 add_ref_cm_node(cm_node);
2152 send_reset(cm_node, skb);
2153 } else {
2154 dev_kfree_skb_any(skb);
2155 }
2156
2157 cm_node->state = NES_CM_STATE_CLOSED;
2158 create_event(cm_node, NES_CM_EVENT_ABORTED);
2159 }
2160
2161 /*
2162 * passive_open_err() will either do a reset() or will free up the skb and
2163 * remove the cm_node.
2164 */
2165 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2166 int reset)
2167 {
2168 cleanup_retrans_entry(cm_node);
2169 cm_node->state = NES_CM_STATE_CLOSED;
2170 if (reset) {
2171 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2172 "cm_node=%p state =%d\n", cm_node, cm_node->state);
2173 send_reset(cm_node, skb);
2174 } else {
2175 dev_kfree_skb_any(skb);
2176 rem_ref_cm_node(cm_node->cm_core, cm_node);
2177 }
2178 }
2179
2180 /*
2181 * free_retrans_entry() routines assumes that the retrans_list_lock has
2182 * been acquired before calling.
2183 */
2184 static void free_retrans_entry(struct nes_cm_node *cm_node)
2185 {
2186 struct nes_timer_entry *send_entry;
2187
2188 send_entry = cm_node->send_entry;
2189 if (send_entry) {
2190 cm_node->send_entry = NULL;
2191 dev_kfree_skb_any(send_entry->skb);
2192 kfree(send_entry);
2193 rem_ref_cm_node(cm_node->cm_core, cm_node);
2194 }
2195 }
2196
2197 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2198 {
2199 unsigned long flags;
2200
2201 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2202 free_retrans_entry(cm_node);
2203 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2204 }
2205
2206 /**
2207 * process_packet
2208 * Returns skb if to be freed, else it will return NULL if already used..
2209 */
2210 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2211 struct nes_cm_core *cm_core)
2212 {
2213 enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2214 struct tcphdr *tcph = tcp_hdr(skb);
2215 u32 fin_set = 0;
2216 int ret = 0;
2217
2218 skb_pull(skb, ip_hdr(skb)->ihl << 2);
2219
2220 nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2221 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2222 tcph->ack, tcph->rst, tcph->fin);
2223
2224 if (tcph->rst) {
2225 pkt_type = NES_PKT_TYPE_RST;
2226 } else if (tcph->syn) {
2227 pkt_type = NES_PKT_TYPE_SYN;
2228 if (tcph->ack)
2229 pkt_type = NES_PKT_TYPE_SYNACK;
2230 } else if (tcph->ack) {
2231 pkt_type = NES_PKT_TYPE_ACK;
2232 }
2233 if (tcph->fin)
2234 fin_set = 1;
2235
2236 switch (pkt_type) {
2237 case NES_PKT_TYPE_SYN:
2238 handle_syn_pkt(cm_node, skb, tcph);
2239 break;
2240 case NES_PKT_TYPE_SYNACK:
2241 handle_synack_pkt(cm_node, skb, tcph);
2242 break;
2243 case NES_PKT_TYPE_ACK:
2244 ret = handle_ack_pkt(cm_node, skb, tcph);
2245 if (fin_set && !ret)
2246 handle_fin_pkt(cm_node);
2247 break;
2248 case NES_PKT_TYPE_RST:
2249 handle_rst_pkt(cm_node, skb, tcph);
2250 break;
2251 default:
2252 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2253 handle_fin_pkt(cm_node);
2254 drop_packet(skb);
2255 break;
2256 }
2257 }
2258
2259 /**
2260 * mini_cm_listen - create a listen node with params
2261 */
2262 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2263 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2264 {
2265 struct nes_cm_listener *listener;
2266 unsigned long flags;
2267
2268 nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2269 cm_info->loc_addr, cm_info->loc_port);
2270
2271 /* cannot have multiple matching listeners */
2272 listener = find_listener(cm_core, cm_info->loc_addr, cm_info->loc_port,
2273 NES_CM_LISTENER_EITHER_STATE);
2274
2275 if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2276 /* find automatically incs ref count ??? */
2277 atomic_dec(&listener->ref_count);
2278 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2279 return NULL;
2280 }
2281
2282 if (!listener) {
2283 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2284 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2285 if (!listener) {
2286 nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
2287 return NULL;
2288 }
2289
2290 listener->loc_addr = cm_info->loc_addr;
2291 listener->loc_port = cm_info->loc_port;
2292 listener->reused_node = 0;
2293
2294 atomic_set(&listener->ref_count, 1);
2295 }
2296 /* pasive case */
2297 /* find already inc'ed the ref count */
2298 else {
2299 listener->reused_node = 1;
2300 }
2301
2302 listener->cm_id = cm_info->cm_id;
2303 atomic_set(&listener->pend_accepts_cnt, 0);
2304 listener->cm_core = cm_core;
2305 listener->nesvnic = nesvnic;
2306 atomic_inc(&cm_core->node_cnt);
2307
2308 listener->conn_type = cm_info->conn_type;
2309 listener->backlog = cm_info->backlog;
2310 listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2311
2312 if (!listener->reused_node) {
2313 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2314 list_add(&listener->list, &cm_core->listen_list.list);
2315 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2316 atomic_inc(&cm_core->listen_node_cnt);
2317 }
2318
2319 nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2320 " listener = %p, backlog = %d, cm_id = %p.\n",
2321 cm_info->loc_addr, cm_info->loc_port,
2322 listener, listener->backlog, listener->cm_id);
2323
2324 return listener;
2325 }
2326
2327
2328 /**
2329 * mini_cm_connect - make a connection node with params
2330 */
2331 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2332 struct nes_vnic *nesvnic, u16 private_data_len,
2333 void *private_data, struct nes_cm_info *cm_info)
2334 {
2335 int ret = 0;
2336 struct nes_cm_node *cm_node;
2337 struct nes_cm_listener *loopbackremotelistener;
2338 struct nes_cm_node *loopbackremotenode;
2339 struct nes_cm_info loopback_cm_info;
2340 u8 *start_buff;
2341
2342 /* create a CM connection node */
2343 cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2344 if (!cm_node)
2345 return NULL;
2346
2347 /* set our node side to client (active) side */
2348 cm_node->tcp_cntxt.client = 1;
2349 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2350
2351 if (cm_info->loc_addr == cm_info->rem_addr) {
2352 loopbackremotelistener = find_listener(cm_core,
2353 cm_node->loc_addr, cm_node->rem_port,
2354 NES_CM_LISTENER_ACTIVE_STATE);
2355 if (loopbackremotelistener == NULL) {
2356 create_event(cm_node, NES_CM_EVENT_ABORTED);
2357 } else {
2358 loopback_cm_info = *cm_info;
2359 loopback_cm_info.loc_port = cm_info->rem_port;
2360 loopback_cm_info.rem_port = cm_info->loc_port;
2361 loopback_cm_info.loc_port =
2362 cm_info->rem_port;
2363 loopback_cm_info.rem_port =
2364 cm_info->loc_port;
2365 loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2366 loopbackremotenode = make_cm_node(cm_core, nesvnic,
2367 &loopback_cm_info, loopbackremotelistener);
2368 if (!loopbackremotenode) {
2369 rem_ref_cm_node(cm_node->cm_core, cm_node);
2370 return NULL;
2371 }
2372 atomic_inc(&cm_loopbacks);
2373 loopbackremotenode->loopbackpartner = cm_node;
2374 loopbackremotenode->tcp_cntxt.rcv_wscale =
2375 NES_CM_DEFAULT_RCV_WND_SCALE;
2376 cm_node->loopbackpartner = loopbackremotenode;
2377 memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2378 private_data_len);
2379 loopbackremotenode->mpa_frame_size = private_data_len;
2380
2381 /* we are done handling this state. */
2382 /* set node to a TSA state */
2383 cm_node->state = NES_CM_STATE_TSA;
2384 cm_node->tcp_cntxt.rcv_nxt =
2385 loopbackremotenode->tcp_cntxt.loc_seq_num;
2386 loopbackremotenode->tcp_cntxt.rcv_nxt =
2387 cm_node->tcp_cntxt.loc_seq_num;
2388 cm_node->tcp_cntxt.max_snd_wnd =
2389 loopbackremotenode->tcp_cntxt.rcv_wnd;
2390 loopbackremotenode->tcp_cntxt.max_snd_wnd =
2391 cm_node->tcp_cntxt.rcv_wnd;
2392 cm_node->tcp_cntxt.snd_wnd =
2393 loopbackremotenode->tcp_cntxt.rcv_wnd;
2394 loopbackremotenode->tcp_cntxt.snd_wnd =
2395 cm_node->tcp_cntxt.rcv_wnd;
2396 cm_node->tcp_cntxt.snd_wscale =
2397 loopbackremotenode->tcp_cntxt.rcv_wscale;
2398 loopbackremotenode->tcp_cntxt.snd_wscale =
2399 cm_node->tcp_cntxt.rcv_wscale;
2400 loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2401 create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2402 }
2403 return cm_node;
2404 }
2405
2406 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2407 cm_node->mpa_frame_size = private_data_len;
2408
2409 memcpy(start_buff, private_data, private_data_len);
2410
2411 /* send a syn and goto syn sent state */
2412 cm_node->state = NES_CM_STATE_SYN_SENT;
2413 ret = send_syn(cm_node, 0, NULL);
2414
2415 if (ret) {
2416 /* error in sending the syn free up the cm_node struct */
2417 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2418 "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2419 cm_node->rem_addr, cm_node->rem_port, cm_node,
2420 cm_node->cm_id);
2421 rem_ref_cm_node(cm_node->cm_core, cm_node);
2422 cm_node = NULL;
2423 }
2424
2425 if (cm_node) {
2426 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2427 "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2428 cm_node->rem_addr, cm_node->rem_port, cm_node,
2429 cm_node->cm_id);
2430 }
2431
2432 return cm_node;
2433 }
2434
2435
2436 /**
2437 * mini_cm_accept - accept a connection
2438 * This function is never called
2439 */
2440 static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2441 {
2442 return 0;
2443 }
2444
2445
2446 /**
2447 * mini_cm_reject - reject and teardown a connection
2448 */
2449 static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2450 {
2451 int ret = 0;
2452 int err = 0;
2453 int passive_state;
2454 struct nes_cm_event event;
2455 struct iw_cm_id *cm_id = cm_node->cm_id;
2456 struct nes_cm_node *loopback = cm_node->loopbackpartner;
2457
2458 nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2459 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2460
2461 if (cm_node->tcp_cntxt.client)
2462 return ret;
2463 cleanup_retrans_entry(cm_node);
2464
2465 if (!loopback) {
2466 passive_state = atomic_add_return(1, &cm_node->passive_state);
2467 if (passive_state == NES_SEND_RESET_EVENT) {
2468 cm_node->state = NES_CM_STATE_CLOSED;
2469 rem_ref_cm_node(cm_core, cm_node);
2470 } else {
2471 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2472 rem_ref_cm_node(cm_core, cm_node);
2473 } else {
2474 ret = send_mpa_reject(cm_node);
2475 if (ret) {
2476 cm_node->state = NES_CM_STATE_CLOSED;
2477 err = send_reset(cm_node, NULL);
2478 if (err)
2479 WARN_ON(1);
2480 } else {
2481 cm_id->add_ref(cm_id);
2482 }
2483 }
2484 }
2485 } else {
2486 cm_node->cm_id = NULL;
2487 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2488 rem_ref_cm_node(cm_core, cm_node);
2489 rem_ref_cm_node(cm_core, loopback);
2490 } else {
2491 event.cm_node = loopback;
2492 event.cm_info.rem_addr = loopback->rem_addr;
2493 event.cm_info.loc_addr = loopback->loc_addr;
2494 event.cm_info.rem_port = loopback->rem_port;
2495 event.cm_info.loc_port = loopback->loc_port;
2496 event.cm_info.cm_id = loopback->cm_id;
2497 cm_event_mpa_reject(&event);
2498 rem_ref_cm_node(cm_core, cm_node);
2499 loopback->state = NES_CM_STATE_CLOSING;
2500
2501 cm_id = loopback->cm_id;
2502 rem_ref_cm_node(cm_core, loopback);
2503 cm_id->rem_ref(cm_id);
2504 }
2505 }
2506
2507 return ret;
2508 }
2509
2510
2511 /**
2512 * mini_cm_close
2513 */
2514 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2515 {
2516 int ret = 0;
2517
2518 if (!cm_core || !cm_node)
2519 return -EINVAL;
2520
2521 switch (cm_node->state) {
2522 case NES_CM_STATE_SYN_RCVD:
2523 case NES_CM_STATE_SYN_SENT:
2524 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2525 case NES_CM_STATE_ESTABLISHED:
2526 case NES_CM_STATE_ACCEPTING:
2527 case NES_CM_STATE_MPAREQ_SENT:
2528 case NES_CM_STATE_MPAREQ_RCVD:
2529 cleanup_retrans_entry(cm_node);
2530 send_reset(cm_node, NULL);
2531 break;
2532 case NES_CM_STATE_CLOSE_WAIT:
2533 cm_node->state = NES_CM_STATE_LAST_ACK;
2534 send_fin(cm_node, NULL);
2535 break;
2536 case NES_CM_STATE_FIN_WAIT1:
2537 case NES_CM_STATE_FIN_WAIT2:
2538 case NES_CM_STATE_LAST_ACK:
2539 case NES_CM_STATE_TIME_WAIT:
2540 case NES_CM_STATE_CLOSING:
2541 ret = -1;
2542 break;
2543 case NES_CM_STATE_LISTENING:
2544 cleanup_retrans_entry(cm_node);
2545 send_reset(cm_node, NULL);
2546 break;
2547 case NES_CM_STATE_MPAREJ_RCVD:
2548 case NES_CM_STATE_UNKNOWN:
2549 case NES_CM_STATE_INITED:
2550 case NES_CM_STATE_CLOSED:
2551 case NES_CM_STATE_LISTENER_DESTROYED:
2552 ret = rem_ref_cm_node(cm_core, cm_node);
2553 break;
2554 case NES_CM_STATE_TSA:
2555 if (cm_node->send_entry)
2556 printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2557 "send_entry=%p\n", cm_node->send_entry);
2558 ret = rem_ref_cm_node(cm_core, cm_node);
2559 break;
2560 }
2561 return ret;
2562 }
2563
2564
2565 /**
2566 * recv_pkt - recv an ETHERNET packet, and process it through CM
2567 * node state machine
2568 */
2569 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2570 struct nes_vnic *nesvnic, struct sk_buff *skb)
2571 {
2572 struct nes_cm_node *cm_node = NULL;
2573 struct nes_cm_listener *listener = NULL;
2574 struct iphdr *iph;
2575 struct tcphdr *tcph;
2576 struct nes_cm_info nfo;
2577 int skb_handled = 1;
2578 __be32 tmp_daddr, tmp_saddr;
2579
2580 if (!skb)
2581 return 0;
2582 if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2583 return 0;
2584
2585 iph = (struct iphdr *)skb->data;
2586 tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2587
2588 nfo.loc_addr = ntohl(iph->daddr);
2589 nfo.loc_port = ntohs(tcph->dest);
2590 nfo.rem_addr = ntohl(iph->saddr);
2591 nfo.rem_port = ntohs(tcph->source);
2592
2593 tmp_daddr = cpu_to_be32(iph->daddr);
2594 tmp_saddr = cpu_to_be32(iph->saddr);
2595
2596 nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2597 &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2598
2599 do {
2600 cm_node = find_node(cm_core,
2601 nfo.rem_port, nfo.rem_addr,
2602 nfo.loc_port, nfo.loc_addr);
2603
2604 if (!cm_node) {
2605 /* Only type of packet accepted are for */
2606 /* the PASSIVE open (syn only) */
2607 if ((!tcph->syn) || (tcph->ack)) {
2608 skb_handled = 0;
2609 break;
2610 }
2611 listener = find_listener(cm_core, nfo.loc_addr,
2612 nfo.loc_port,
2613 NES_CM_LISTENER_ACTIVE_STATE);
2614 if (!listener) {
2615 nfo.cm_id = NULL;
2616 nfo.conn_type = 0;
2617 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2618 skb_handled = 0;
2619 break;
2620 }
2621 nfo.cm_id = listener->cm_id;
2622 nfo.conn_type = listener->conn_type;
2623 cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2624 listener);
2625 if (!cm_node) {
2626 nes_debug(NES_DBG_CM, "Unable to allocate "
2627 "node\n");
2628 cm_packets_dropped++;
2629 atomic_dec(&listener->ref_count);
2630 dev_kfree_skb_any(skb);
2631 break;
2632 }
2633 if (!tcph->rst && !tcph->fin) {
2634 cm_node->state = NES_CM_STATE_LISTENING;
2635 } else {
2636 cm_packets_dropped++;
2637 rem_ref_cm_node(cm_core, cm_node);
2638 dev_kfree_skb_any(skb);
2639 break;
2640 }
2641 add_ref_cm_node(cm_node);
2642 } else if (cm_node->state == NES_CM_STATE_TSA) {
2643 if (cm_node->nesqp->pau_mode)
2644 nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2645 else {
2646 rem_ref_cm_node(cm_core, cm_node);
2647 atomic_inc(&cm_accel_dropped_pkts);
2648 dev_kfree_skb_any(skb);
2649 }
2650 break;
2651 }
2652 skb_reset_network_header(skb);
2653 skb_set_transport_header(skb, sizeof(*tcph));
2654 skb->len = ntohs(iph->tot_len);
2655 process_packet(cm_node, skb, cm_core);
2656 rem_ref_cm_node(cm_core, cm_node);
2657 } while (0);
2658 return skb_handled;
2659 }
2660
2661
2662 /**
2663 * nes_cm_alloc_core - allocate a top level instance of a cm core
2664 */
2665 static struct nes_cm_core *nes_cm_alloc_core(void)
2666 {
2667 struct nes_cm_core *cm_core;
2668
2669 /* setup the CM core */
2670 /* alloc top level core control structure */
2671 cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2672 if (!cm_core)
2673 return NULL;
2674
2675 INIT_LIST_HEAD(&cm_core->connected_nodes);
2676 init_timer(&cm_core->tcp_timer);
2677 cm_core->tcp_timer.function = nes_cm_timer_tick;
2678
2679 cm_core->mtu = NES_CM_DEFAULT_MTU;
2680 cm_core->state = NES_CM_STATE_INITED;
2681 cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2682
2683 atomic_set(&cm_core->events_posted, 0);
2684
2685 cm_core->api = &nes_cm_api;
2686
2687 spin_lock_init(&cm_core->ht_lock);
2688 spin_lock_init(&cm_core->listen_list_lock);
2689
2690 INIT_LIST_HEAD(&cm_core->listen_list.list);
2691
2692 nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2693
2694 nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2695 cm_core->event_wq = create_singlethread_workqueue("nesewq");
2696 if (!cm_core->event_wq)
2697 goto out_free_cmcore;
2698 cm_core->post_event = nes_cm_post_event;
2699 nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2700 cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2701 if (!cm_core->disconn_wq)
2702 goto out_free_wq;
2703
2704 print_core(cm_core);
2705 return cm_core;
2706
2707 out_free_wq:
2708 destroy_workqueue(cm_core->event_wq);
2709 out_free_cmcore:
2710 kfree(cm_core);
2711 return NULL;
2712 }
2713
2714
2715 /**
2716 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2717 */
2718 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2719 {
2720 nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2721
2722 if (!cm_core)
2723 return -EINVAL;
2724
2725 barrier();
2726
2727 if (timer_pending(&cm_core->tcp_timer))
2728 del_timer(&cm_core->tcp_timer);
2729
2730 destroy_workqueue(cm_core->event_wq);
2731 destroy_workqueue(cm_core->disconn_wq);
2732 nes_debug(NES_DBG_CM, "\n");
2733 kfree(cm_core);
2734
2735 return 0;
2736 }
2737
2738
2739 /**
2740 * mini_cm_get
2741 */
2742 static int mini_cm_get(struct nes_cm_core *cm_core)
2743 {
2744 return cm_core->state;
2745 }
2746
2747
2748 /**
2749 * mini_cm_set
2750 */
2751 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2752 {
2753 int ret = 0;
2754
2755 switch (type) {
2756 case NES_CM_SET_PKT_SIZE:
2757 cm_core->mtu = value;
2758 break;
2759 case NES_CM_SET_FREE_PKT_Q_SIZE:
2760 cm_core->free_tx_pkt_max = value;
2761 break;
2762 default:
2763 /* unknown set option */
2764 ret = -EINVAL;
2765 }
2766
2767 return ret;
2768 }
2769
2770
2771 /**
2772 * nes_cm_init_tsa_conn setup HW; MPA frames must be
2773 * successfully exchanged when this is called
2774 */
2775 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2776 {
2777 int ret = 0;
2778
2779 if (!nesqp)
2780 return -EINVAL;
2781
2782 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2783 NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2784 NES_QPCONTEXT_MISC_DROS);
2785
2786 if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2787 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2788
2789 nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2790
2791 nesqp->nesqp_context->misc2 |= cpu_to_le32(
2792 cm_node->tos << NES_QPCONTEXT_MISC2_TOS_SHIFT);
2793
2794 nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2795
2796 nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2797 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2798
2799 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2800 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2801 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2802
2803 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2804 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2805 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2806
2807 nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2808 nesqp->nesqp_context->ts_recent = 0;
2809 nesqp->nesqp_context->ts_age = 0;
2810 nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2811 nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2812 nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2813 nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2814 cm_node->tcp_cntxt.rcv_wscale);
2815 nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2816 nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2817 nesqp->nesqp_context->srtt = 0;
2818 nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2819 nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2820 nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2821 nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2822 nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2823 nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2824
2825 nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2826 " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2827 nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2828 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2829 cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2830 le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2831 le32_to_cpu(nesqp->nesqp_context->misc));
2832 nes_debug(NES_DBG_CM, " snd_wnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2833 nes_debug(NES_DBG_CM, " snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2834 nes_debug(NES_DBG_CM, " max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2835
2836 nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2837 cm_node->state = NES_CM_STATE_TSA;
2838
2839 return ret;
2840 }
2841
2842
2843 /**
2844 * nes_cm_disconn
2845 */
2846 int nes_cm_disconn(struct nes_qp *nesqp)
2847 {
2848 struct disconn_work *work;
2849
2850 work = kzalloc(sizeof *work, GFP_ATOMIC);
2851 if (!work)
2852 return -ENOMEM; /* Timer will clean up */
2853
2854 nes_add_ref(&nesqp->ibqp);
2855 work->nesqp = nesqp;
2856 INIT_WORK(&work->work, nes_disconnect_worker);
2857 queue_work(g_cm_core->disconn_wq, &work->work);
2858 return 0;
2859 }
2860
2861
2862 /**
2863 * nes_disconnect_worker
2864 */
2865 static void nes_disconnect_worker(struct work_struct *work)
2866 {
2867 struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2868 struct nes_qp *nesqp = dwork->nesqp;
2869
2870 kfree(dwork);
2871 nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2872 nesqp->last_aeq, nesqp->hwqp.qp_id);
2873 nes_cm_disconn_true(nesqp);
2874 nes_rem_ref(&nesqp->ibqp);
2875 }
2876
2877
2878 /**
2879 * nes_cm_disconn_true
2880 */
2881 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2882 {
2883 unsigned long flags;
2884 int ret = 0;
2885 struct iw_cm_id *cm_id;
2886 struct iw_cm_event cm_event;
2887 struct nes_vnic *nesvnic;
2888 u16 last_ae;
2889 u8 original_hw_tcp_state;
2890 u8 original_ibqp_state;
2891 int disconn_status = 0;
2892 int issue_disconn = 0;
2893 int issue_close = 0;
2894 int issue_flush = 0;
2895 u32 flush_q = NES_CQP_FLUSH_RQ;
2896 struct ib_event ibevent;
2897
2898 if (!nesqp) {
2899 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2900 return -1;
2901 }
2902
2903 spin_lock_irqsave(&nesqp->lock, flags);
2904 cm_id = nesqp->cm_id;
2905 /* make sure we havent already closed this connection */
2906 if (!cm_id) {
2907 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2908 nesqp->hwqp.qp_id);
2909 spin_unlock_irqrestore(&nesqp->lock, flags);
2910 return -1;
2911 }
2912
2913 nesvnic = to_nesvnic(nesqp->ibqp.device);
2914 nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2915
2916 original_hw_tcp_state = nesqp->hw_tcp_state;
2917 original_ibqp_state = nesqp->ibqp_state;
2918 last_ae = nesqp->last_aeq;
2919
2920 if (nesqp->term_flags) {
2921 issue_disconn = 1;
2922 issue_close = 1;
2923 nesqp->cm_id = NULL;
2924 del_timer(&nesqp->terminate_timer);
2925 if (nesqp->flush_issued == 0) {
2926 nesqp->flush_issued = 1;
2927 issue_flush = 1;
2928 }
2929 } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2930 ((original_ibqp_state == IB_QPS_RTS) &&
2931 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2932 issue_disconn = 1;
2933 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2934 disconn_status = -ECONNRESET;
2935 }
2936
2937 if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2938 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2939 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2940 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2941 issue_close = 1;
2942 nesqp->cm_id = NULL;
2943 if (nesqp->flush_issued == 0) {
2944 nesqp->flush_issued = 1;
2945 issue_flush = 1;
2946 }
2947 }
2948
2949 spin_unlock_irqrestore(&nesqp->lock, flags);
2950
2951 if ((issue_flush) && (nesqp->destroyed == 0)) {
2952 /* Flush the queue(s) */
2953 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2954 flush_q |= NES_CQP_FLUSH_SQ;
2955 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2956
2957 if (nesqp->term_flags) {
2958 ibevent.device = nesqp->ibqp.device;
2959 ibevent.event = nesqp->terminate_eventtype;
2960 ibevent.element.qp = &nesqp->ibqp;
2961 if (nesqp->ibqp.event_handler)
2962 nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2963 }
2964 }
2965
2966 if ((cm_id) && (cm_id->event_handler)) {
2967 if (issue_disconn) {
2968 atomic_inc(&cm_disconnects);
2969 cm_event.event = IW_CM_EVENT_DISCONNECT;
2970 cm_event.status = disconn_status;
2971 cm_event.local_addr = cm_id->m_local_addr;
2972 cm_event.remote_addr = cm_id->m_remote_addr;
2973 cm_event.private_data = NULL;
2974 cm_event.private_data_len = 0;
2975
2976 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2977 " for QP%u, SQ Head = %u, SQ Tail = %u. "
2978 "cm_id = %p, refcount = %u.\n",
2979 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2980 nesqp->hwqp.sq_tail, cm_id,
2981 atomic_read(&nesqp->refcount));
2982
2983 ret = cm_id->event_handler(cm_id, &cm_event);
2984 if (ret)
2985 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2986 "returned, ret=%d\n", ret);
2987 }
2988
2989 if (issue_close) {
2990 atomic_inc(&cm_closes);
2991 nes_disconnect(nesqp, 1);
2992
2993 cm_id->provider_data = nesqp;
2994 /* Send up the close complete event */
2995 cm_event.event = IW_CM_EVENT_CLOSE;
2996 cm_event.status = 0;
2997 cm_event.provider_data = cm_id->provider_data;
2998 cm_event.local_addr = cm_id->m_local_addr;
2999 cm_event.remote_addr = cm_id->m_remote_addr;
3000 cm_event.private_data = NULL;
3001 cm_event.private_data_len = 0;
3002
3003 ret = cm_id->event_handler(cm_id, &cm_event);
3004 if (ret)
3005 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3006
3007 cm_id->rem_ref(cm_id);
3008 }
3009 }
3010
3011 return 0;
3012 }
3013
3014
3015 /**
3016 * nes_disconnect
3017 */
3018 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
3019 {
3020 int ret = 0;
3021 struct nes_vnic *nesvnic;
3022 struct nes_device *nesdev;
3023 struct nes_ib_device *nesibdev;
3024
3025 nesvnic = to_nesvnic(nesqp->ibqp.device);
3026 if (!nesvnic)
3027 return -EINVAL;
3028
3029 nesdev = nesvnic->nesdev;
3030 nesibdev = nesvnic->nesibdev;
3031
3032 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3033 netdev_refcnt_read(nesvnic->netdev));
3034
3035 if (nesqp->active_conn) {
3036
3037 /* indicate this connection is NOT active */
3038 nesqp->active_conn = 0;
3039 } else {
3040 /* Need to free the Last Streaming Mode Message */
3041 if (nesqp->ietf_frame) {
3042 if (nesqp->lsmm_mr)
3043 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
3044 pci_free_consistent(nesdev->pcidev,
3045 nesqp->private_data_len + nesqp->ietf_frame_size,
3046 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3047 }
3048 }
3049
3050 /* close the CM node down if it is still active */
3051 if (nesqp->cm_node) {
3052 nes_debug(NES_DBG_CM, "Call close API\n");
3053
3054 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
3055 }
3056
3057 return ret;
3058 }
3059
3060
3061 /**
3062 * nes_accept
3063 */
3064 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3065 {
3066 u64 u64temp;
3067 struct ib_qp *ibqp;
3068 struct nes_qp *nesqp;
3069 struct nes_vnic *nesvnic;
3070 struct nes_device *nesdev;
3071 struct nes_cm_node *cm_node;
3072 struct nes_adapter *adapter;
3073 struct ib_qp_attr attr;
3074 struct iw_cm_event cm_event;
3075 struct nes_hw_qp_wqe *wqe;
3076 struct nes_v4_quad nes_quad;
3077 u32 crc_value;
3078 int ret;
3079 int passive_state;
3080 struct nes_ib_device *nesibdev;
3081 struct ib_mr *ibmr = NULL;
3082 struct nes_pd *nespd;
3083 u64 tagged_offset;
3084 u8 mpa_frame_offset = 0;
3085 struct ietf_mpa_v2 *mpa_v2_frame;
3086 u8 start_addr = 0;
3087 u8 *start_ptr = &start_addr;
3088 u8 **start_buff = &start_ptr;
3089 u16 buff_len = 0;
3090 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3091 struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3092
3093 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3094 if (!ibqp)
3095 return -EINVAL;
3096
3097 /* get all our handles */
3098 nesqp = to_nesqp(ibqp);
3099 nesvnic = to_nesvnic(nesqp->ibqp.device);
3100 nesdev = nesvnic->nesdev;
3101 adapter = nesdev->nesadapter;
3102
3103 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3104 nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3105 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3106 nesvnic->netdev->name);
3107
3108 if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3109 if (cm_node->loopbackpartner)
3110 rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3111 rem_ref_cm_node(cm_node->cm_core, cm_node);
3112 return -EINVAL;
3113 }
3114
3115 passive_state = atomic_add_return(1, &cm_node->passive_state);
3116 if (passive_state == NES_SEND_RESET_EVENT) {
3117 rem_ref_cm_node(cm_node->cm_core, cm_node);
3118 return -ECONNRESET;
3119 }
3120 /* associate the node with the QP */
3121 nesqp->cm_node = (void *)cm_node;
3122 cm_node->nesqp = nesqp;
3123
3124
3125 nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3126 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3127 atomic_inc(&cm_accepts);
3128
3129 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3130 netdev_refcnt_read(nesvnic->netdev));
3131
3132 nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3133 /* allocate the ietf frame and space for private data */
3134 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3135 nesqp->ietf_frame_size + conn_param->private_data_len,
3136 &nesqp->ietf_frame_pbase);
3137
3138 if (!nesqp->ietf_frame) {
3139 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3140 return -ENOMEM;
3141 }
3142 mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3143
3144 if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3145 mpa_frame_offset = 4;
3146
3147 if (cm_node->mpa_frame_rev == IETF_MPA_V1 ||
3148 cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
3149 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3150 }
3151
3152 memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3153 conn_param->private_data_len);
3154
3155 cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3156 nesqp->private_data_len = conn_param->private_data_len;
3157
3158 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3159 wqe = &nesqp->hwqp.sq_vbase[0];
3160
3161 if (raddr->sin_addr.s_addr != laddr->sin_addr.s_addr) {
3162 u64temp = (unsigned long)nesqp;
3163 nesibdev = nesvnic->nesibdev;
3164 nespd = nesqp->nespd;
3165 tagged_offset = (u64)(unsigned long)*start_buff;
3166 ibmr = nes_reg_phys_mr(&nespd->ibpd,
3167 nesqp->ietf_frame_pbase + mpa_frame_offset,
3168 buff_len, IB_ACCESS_LOCAL_WRITE,
3169 &tagged_offset);
3170 if (IS_ERR(ibmr)) {
3171 nes_debug(NES_DBG_CM, "Unable to register memory region"
3172 "for lSMM for cm_node = %p \n",
3173 cm_node);
3174 pci_free_consistent(nesdev->pcidev,
3175 nesqp->private_data_len + nesqp->ietf_frame_size,
3176 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3177 return PTR_ERR(ibmr);
3178 }
3179
3180 ibmr->pd = &nespd->ibpd;
3181 ibmr->device = nespd->ibpd.device;
3182 nesqp->lsmm_mr = ibmr;
3183
3184 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3185 set_wqe_64bit_value(wqe->wqe_words,
3186 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3187 u64temp);
3188 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3189 cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3190 NES_IWARP_SQ_WQE_WRPDU);
3191 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3192 cpu_to_le32(buff_len);
3193 set_wqe_64bit_value(wqe->wqe_words,
3194 NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3195 (u64)(unsigned long)(*start_buff));
3196 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3197 cpu_to_le32(buff_len);
3198 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3199 if (nesqp->sq_kmapped) {
3200 nesqp->sq_kmapped = 0;
3201 kunmap(nesqp->page);
3202 }
3203
3204 nesqp->nesqp_context->ird_ord_sizes |=
3205 cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3206 NES_QPCONTEXT_ORDIRD_WRPDU);
3207 } else {
3208 nesqp->nesqp_context->ird_ord_sizes |=
3209 cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3210 }
3211 nesqp->skip_lsmm = 1;
3212
3213 /* Cache the cm_id in the qp */
3214 nesqp->cm_id = cm_id;
3215 cm_node->cm_id = cm_id;
3216
3217 /* nesqp->cm_node = (void *)cm_id->provider_data; */
3218 cm_id->provider_data = nesqp;
3219 nesqp->active_conn = 0;
3220
3221 if (cm_node->state == NES_CM_STATE_TSA)
3222 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3223 cm_node);
3224
3225 nes_cm_init_tsa_conn(nesqp, cm_node);
3226
3227 nesqp->nesqp_context->tcpPorts[0] =
3228 cpu_to_le16(cm_node->loc_port);
3229 nesqp->nesqp_context->tcpPorts[1] =
3230 cpu_to_le16(cm_node->rem_port);
3231
3232 nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->rem_addr);
3233
3234 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3235 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3236 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3237
3238 nesqp->nesqp_context->arp_index_vlan |=
3239 cpu_to_le32(nes_arp_table(nesdev,
3240 le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3241 NES_ARP_RESOLVE) << 16);
3242
3243 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3244 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3245
3246 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3247
3248 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3249 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3250 nesqp->nesqp_context->ird_ord_sizes |=
3251 cpu_to_le32((u32)cm_node->ord_size);
3252
3253 memset(&nes_quad, 0, sizeof(nes_quad));
3254 nes_quad.DstIpAdrIndex =
3255 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3256 nes_quad.SrcIpadr = htonl(cm_node->rem_addr);
3257 nes_quad.TcpPorts[0] = htons(cm_node->rem_port);
3258 nes_quad.TcpPorts[1] = htons(cm_node->loc_port);
3259
3260 /* Produce hash key */
3261 crc_value = get_crc_value(&nes_quad);
3262 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3263 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3264 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3265
3266 nesqp->hte_index &= adapter->hte_index_mask;
3267 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3268
3269 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3270
3271 nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3272 "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3273 "private data length=%u.\n", nesqp->hwqp.qp_id,
3274 ntohl(raddr->sin_addr.s_addr), ntohs(raddr->sin_port),
3275 ntohl(laddr->sin_addr.s_addr), ntohs(laddr->sin_port),
3276 le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3277 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3278 buff_len);
3279
3280 /* notify OF layer that accept event was successful */
3281 cm_id->add_ref(cm_id);
3282 nes_add_ref(&nesqp->ibqp);
3283
3284 cm_event.event = IW_CM_EVENT_ESTABLISHED;
3285 cm_event.status = 0;
3286 cm_event.provider_data = (void *)nesqp;
3287 cm_event.local_addr = cm_id->m_local_addr;
3288 cm_event.remote_addr = cm_id->m_remote_addr;
3289 cm_event.private_data = NULL;
3290 cm_event.private_data_len = 0;
3291 cm_event.ird = cm_node->ird_size;
3292 cm_event.ord = cm_node->ord_size;
3293
3294 ret = cm_id->event_handler(cm_id, &cm_event);
3295 attr.qp_state = IB_QPS_RTS;
3296 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3297 if (cm_node->loopbackpartner) {
3298 cm_node->loopbackpartner->mpa_frame_size =
3299 nesqp->private_data_len;
3300 /* copy entire MPA frame to our cm_node's frame */
3301 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3302 conn_param->private_data, conn_param->private_data_len);
3303 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3304 }
3305 if (ret)
3306 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3307 "ret=%d\n", __func__, __LINE__, ret);
3308
3309 return 0;
3310 }
3311
3312
3313 /**
3314 * nes_reject
3315 */
3316 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3317 {
3318 struct nes_cm_node *cm_node;
3319 struct nes_cm_node *loopback;
3320 struct nes_cm_core *cm_core;
3321 u8 *start_buff;
3322
3323 atomic_inc(&cm_rejects);
3324 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3325 loopback = cm_node->loopbackpartner;
3326 cm_core = cm_node->cm_core;
3327 cm_node->cm_id = cm_id;
3328
3329 if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3330 return -EINVAL;
3331
3332 if (loopback) {
3333 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3334 loopback->mpa_frame.priv_data_len = pdata_len;
3335 loopback->mpa_frame_size = pdata_len;
3336 } else {
3337 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3338 cm_node->mpa_frame_size = pdata_len;
3339 memcpy(start_buff, pdata, pdata_len);
3340 }
3341 return cm_core->api->reject(cm_core, cm_node);
3342 }
3343
3344
3345 /**
3346 * nes_connect
3347 * setup and launch cm connect node
3348 */
3349 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3350 {
3351 struct ib_qp *ibqp;
3352 struct nes_qp *nesqp;
3353 struct nes_vnic *nesvnic;
3354 struct nes_device *nesdev;
3355 struct nes_cm_node *cm_node;
3356 struct nes_cm_info cm_info;
3357 int apbvt_set = 0;
3358 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3359 struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3360
3361 if (cm_id->remote_addr.ss_family != AF_INET)
3362 return -ENOSYS;
3363 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3364 if (!ibqp)
3365 return -EINVAL;
3366 nesqp = to_nesqp(ibqp);
3367 if (!nesqp)
3368 return -EINVAL;
3369 nesvnic = to_nesvnic(nesqp->ibqp.device);
3370 if (!nesvnic)
3371 return -EINVAL;
3372 nesdev = nesvnic->nesdev;
3373 if (!nesdev)
3374 return -EINVAL;
3375
3376 if (!laddr->sin_port || !raddr->sin_port)
3377 return -EINVAL;
3378
3379 nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3380 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3381 ntohl(nesvnic->local_ipaddr), ntohl(raddr->sin_addr.s_addr),
3382 ntohs(raddr->sin_port), ntohl(laddr->sin_addr.s_addr),
3383 ntohs(laddr->sin_port));
3384
3385 atomic_inc(&cm_connects);
3386 nesqp->active_conn = 1;
3387
3388 /* cache the cm_id in the qp */
3389 nesqp->cm_id = cm_id;
3390 cm_id->provider_data = nesqp;
3391 nesqp->private_data_len = conn_param->private_data_len;
3392
3393 nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3394 nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3395 conn_param->private_data_len);
3396
3397 /* set up the connection params for the node */
3398 cm_info.loc_addr = ntohl(laddr->sin_addr.s_addr);
3399 cm_info.loc_port = ntohs(laddr->sin_port);
3400 cm_info.rem_addr = ntohl(raddr->sin_addr.s_addr);
3401 cm_info.rem_port = ntohs(raddr->sin_port);
3402 cm_info.cm_id = cm_id;
3403 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3404
3405 if (laddr->sin_addr.s_addr != raddr->sin_addr.s_addr) {
3406 nes_manage_apbvt(nesvnic, cm_info.loc_port,
3407 PCI_FUNC(nesdev->pcidev->devfn),
3408 NES_MANAGE_APBVT_ADD);
3409 apbvt_set = 1;
3410 }
3411
3412 cm_id->add_ref(cm_id);
3413
3414 /* create a connect CM node connection */
3415 cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3416 conn_param->private_data_len, (void *)conn_param->private_data,
3417 &cm_info);
3418 if (!cm_node) {
3419 if (apbvt_set)
3420 nes_manage_apbvt(nesvnic, cm_info.loc_port,
3421 PCI_FUNC(nesdev->pcidev->devfn),
3422 NES_MANAGE_APBVT_DEL);
3423
3424 nes_debug(NES_DBG_NLMSG, "Delete loc_port = %04X\n",
3425 cm_info.loc_port);
3426 cm_id->rem_ref(cm_id);
3427 return -ENOMEM;
3428 }
3429
3430 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3431 if (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO &&
3432 cm_node->ord_size == 0)
3433 cm_node->ord_size = 1;
3434
3435 cm_node->apbvt_set = apbvt_set;
3436 cm_node->tos = cm_id->tos;
3437 nesqp->cm_node = cm_node;
3438 cm_node->nesqp = nesqp;
3439 nes_add_ref(&nesqp->ibqp);
3440
3441 return 0;
3442 }
3443
3444
3445 /**
3446 * nes_create_listen
3447 */
3448 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3449 {
3450 struct nes_vnic *nesvnic;
3451 struct nes_cm_listener *cm_node;
3452 struct nes_cm_info cm_info;
3453 int err;
3454 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3455
3456 nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3457 cm_id, ntohs(laddr->sin_port));
3458
3459 if (cm_id->m_local_addr.ss_family != AF_INET)
3460 return -ENOSYS;
3461 nesvnic = to_nesvnic(cm_id->device);
3462 if (!nesvnic)
3463 return -EINVAL;
3464
3465 nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3466 nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3467
3468 nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3469 nesvnic->local_ipaddr, laddr->sin_addr.s_addr);
3470
3471 /* setup listen params in our api call struct */
3472 cm_info.loc_addr = ntohl(nesvnic->local_ipaddr);
3473 cm_info.loc_port = ntohs(laddr->sin_port);
3474 cm_info.backlog = backlog;
3475 cm_info.cm_id = cm_id;
3476
3477 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3478
3479 cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3480 if (!cm_node) {
3481 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3482 __func__, __LINE__);
3483 return -ENOMEM;
3484 }
3485
3486 cm_id->provider_data = cm_node;
3487 cm_node->tos = cm_id->tos;
3488
3489 if (!cm_node->reused_node) {
3490 err = nes_manage_apbvt(nesvnic, cm_node->loc_port,
3491 PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3492 NES_MANAGE_APBVT_ADD);
3493 if (err) {
3494 printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3495 err);
3496 g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3497 return err;
3498 }
3499 atomic_inc(&cm_listens_created);
3500 }
3501
3502 cm_id->add_ref(cm_id);
3503 cm_id->provider_data = (void *)cm_node;
3504
3505
3506 return 0;
3507 }
3508
3509
3510 /**
3511 * nes_destroy_listen
3512 */
3513 int nes_destroy_listen(struct iw_cm_id *cm_id)
3514 {
3515 if (cm_id->provider_data)
3516 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3517 else
3518 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3519
3520 cm_id->rem_ref(cm_id);
3521
3522 return 0;
3523 }
3524
3525
3526 /**
3527 * nes_cm_recv
3528 */
3529 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3530 {
3531 int rc = 0;
3532
3533 cm_packets_received++;
3534 if ((g_cm_core) && (g_cm_core->api))
3535 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3536 else
3537 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3538 " cm is not setup properly.\n");
3539
3540 return rc;
3541 }
3542
3543
3544 /**
3545 * nes_cm_start
3546 * Start and init a cm core module
3547 */
3548 int nes_cm_start(void)
3549 {
3550 nes_debug(NES_DBG_CM, "\n");
3551 /* create the primary CM core, pass this handle to subsequent core inits */
3552 g_cm_core = nes_cm_alloc_core();
3553 if (g_cm_core)
3554 return 0;
3555 else
3556 return -ENOMEM;
3557 }
3558
3559
3560 /**
3561 * nes_cm_stop
3562 * stop and dealloc all cm core instances
3563 */
3564 int nes_cm_stop(void)
3565 {
3566 g_cm_core->api->destroy_cm_core(g_cm_core);
3567 return 0;
3568 }
3569
3570
3571 /**
3572 * cm_event_connected
3573 * handle a connected event, setup QPs and HW
3574 */
3575 static void cm_event_connected(struct nes_cm_event *event)
3576 {
3577 struct nes_qp *nesqp;
3578 struct nes_vnic *nesvnic;
3579 struct nes_device *nesdev;
3580 struct nes_cm_node *cm_node;
3581 struct nes_adapter *nesadapter;
3582 struct ib_qp_attr attr;
3583 struct iw_cm_id *cm_id;
3584 struct iw_cm_event cm_event;
3585 struct nes_v4_quad nes_quad;
3586 u32 crc_value;
3587 int ret;
3588 struct sockaddr_in *laddr;
3589 struct sockaddr_in *raddr;
3590 struct sockaddr_in *cm_event_laddr;
3591
3592 /* get all our handles */
3593 cm_node = event->cm_node;
3594 cm_id = cm_node->cm_id;
3595 nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3596 nesqp = (struct nes_qp *)cm_id->provider_data;
3597 nesvnic = to_nesvnic(nesqp->ibqp.device);
3598 nesdev = nesvnic->nesdev;
3599 nesadapter = nesdev->nesadapter;
3600 laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3601 raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3602 cm_event_laddr = (struct sockaddr_in *)&cm_event.local_addr;
3603
3604 if (nesqp->destroyed)
3605 return;
3606 atomic_inc(&cm_connecteds);
3607 nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
3608 " local port 0x%04X. jiffies = %lu.\n",
3609 nesqp->hwqp.qp_id, ntohl(raddr->sin_addr.s_addr),
3610 ntohs(raddr->sin_port), ntohs(laddr->sin_port), jiffies);
3611
3612 nes_cm_init_tsa_conn(nesqp, cm_node);
3613
3614 /* set the QP tsa context */
3615 nesqp->nesqp_context->tcpPorts[0] =
3616 cpu_to_le16(cm_node->loc_port);
3617 nesqp->nesqp_context->tcpPorts[1] =
3618 cpu_to_le16(cm_node->rem_port);
3619 nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->rem_addr);
3620
3621 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3622 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3623 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3624 nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3625 nes_arp_table(nesdev,
3626 le32_to_cpu(nesqp->nesqp_context->ip0),
3627 NULL, NES_ARP_RESOLVE) << 16);
3628 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3629 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3630 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3631 nesqp->nesqp_context->ird_ord_sizes |=
3632 cpu_to_le32((u32)1 <<
3633 NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3634 nesqp->nesqp_context->ird_ord_sizes |=
3635 cpu_to_le32((u32)cm_node->ord_size);
3636
3637 /* Adjust tail for not having a LSMM */
3638 /*nesqp->hwqp.sq_tail = 1;*/
3639
3640 build_rdma0_msg(cm_node, &nesqp);
3641
3642 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3643 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3644
3645 memset(&nes_quad, 0, sizeof(nes_quad));
3646
3647 nes_quad.DstIpAdrIndex =
3648 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3649 nes_quad.SrcIpadr = htonl(cm_node->rem_addr);
3650 nes_quad.TcpPorts[0] = htons(cm_node->rem_port);
3651 nes_quad.TcpPorts[1] = htons(cm_node->loc_port);
3652
3653 /* Produce hash key */
3654 crc_value = get_crc_value(&nes_quad);
3655 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3656 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3657 nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3658
3659 nesqp->hte_index &= nesadapter->hte_index_mask;
3660 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3661
3662 nesqp->ietf_frame = &cm_node->mpa_frame;
3663 nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3664 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3665
3666 /* notify OF layer we successfully created the requested connection */
3667 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3668 cm_event.status = 0;
3669 cm_event.provider_data = cm_id->provider_data;
3670 cm_event_laddr->sin_family = AF_INET;
3671 cm_event_laddr->sin_port = laddr->sin_port;
3672 cm_event.remote_addr = cm_id->m_remote_addr;
3673
3674 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3675 cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3676 cm_event.ird = cm_node->ird_size;
3677 cm_event.ord = cm_node->ord_size;
3678
3679 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3680 ret = cm_id->event_handler(cm_id, &cm_event);
3681 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3682
3683 if (ret)
3684 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3685 "ret=%d\n", __func__, __LINE__, ret);
3686 attr.qp_state = IB_QPS_RTS;
3687 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3688
3689 nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3690 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3691
3692 return;
3693 }
3694
3695
3696 /**
3697 * cm_event_connect_error
3698 */
3699 static void cm_event_connect_error(struct nes_cm_event *event)
3700 {
3701 struct nes_qp *nesqp;
3702 struct iw_cm_id *cm_id;
3703 struct iw_cm_event cm_event;
3704 /* struct nes_cm_info cm_info; */
3705 int ret;
3706
3707 if (!event->cm_node)
3708 return;
3709
3710 cm_id = event->cm_node->cm_id;
3711 if (!cm_id)
3712 return;
3713
3714 nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3715 nesqp = cm_id->provider_data;
3716
3717 if (!nesqp)
3718 return;
3719
3720 /* notify OF layer about this connection error event */
3721 /* cm_id->rem_ref(cm_id); */
3722 nesqp->cm_id = NULL;
3723 cm_id->provider_data = NULL;
3724 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3725 cm_event.status = -ECONNRESET;
3726 cm_event.provider_data = cm_id->provider_data;
3727 cm_event.local_addr = cm_id->m_local_addr;
3728 cm_event.remote_addr = cm_id->m_remote_addr;
3729 cm_event.private_data = NULL;
3730 cm_event.private_data_len = 0;
3731
3732 #ifdef CONFIG_INFINIBAND_NES_DEBUG
3733 {
3734 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3735 &cm_event.local_addr;
3736 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3737 &cm_event.remote_addr;
3738 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remote_addr=%08x\n",
3739 cm_event_laddr->sin_addr.s_addr, cm_event_raddr->sin_addr.s_addr);
3740 }
3741 #endif
3742
3743 ret = cm_id->event_handler(cm_id, &cm_event);
3744 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3745 if (ret)
3746 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3747 "ret=%d\n", __func__, __LINE__, ret);
3748 cm_id->rem_ref(cm_id);
3749
3750 rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3751 return;
3752 }
3753
3754
3755 /**
3756 * cm_event_reset
3757 */
3758 static void cm_event_reset(struct nes_cm_event *event)
3759 {
3760 struct nes_qp *nesqp;
3761 struct iw_cm_id *cm_id;
3762 struct iw_cm_event cm_event;
3763 /* struct nes_cm_info cm_info; */
3764 int ret;
3765
3766 if (!event->cm_node)
3767 return;
3768
3769 if (!event->cm_node->cm_id)
3770 return;
3771
3772 cm_id = event->cm_node->cm_id;
3773
3774 nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3775 nesqp = cm_id->provider_data;
3776 if (!nesqp)
3777 return;
3778
3779 nesqp->cm_id = NULL;
3780 /* cm_id->provider_data = NULL; */
3781 cm_event.event = IW_CM_EVENT_DISCONNECT;
3782 cm_event.status = -ECONNRESET;
3783 cm_event.provider_data = cm_id->provider_data;
3784 cm_event.local_addr = cm_id->m_local_addr;
3785 cm_event.remote_addr = cm_id->m_remote_addr;
3786 cm_event.private_data = NULL;
3787 cm_event.private_data_len = 0;
3788
3789 cm_id->add_ref(cm_id);
3790 ret = cm_id->event_handler(cm_id, &cm_event);
3791 atomic_inc(&cm_closes);
3792 cm_event.event = IW_CM_EVENT_CLOSE;
3793 cm_event.status = 0;
3794 cm_event.provider_data = cm_id->provider_data;
3795 cm_event.local_addr = cm_id->m_local_addr;
3796 cm_event.remote_addr = cm_id->m_remote_addr;
3797 cm_event.private_data = NULL;
3798 cm_event.private_data_len = 0;
3799 nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3800 ret = cm_id->event_handler(cm_id, &cm_event);
3801
3802 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3803
3804
3805 /* notify OF layer about this connection error event */
3806 cm_id->rem_ref(cm_id);
3807
3808 return;
3809 }
3810
3811
3812 /**
3813 * cm_event_mpa_req
3814 */
3815 static void cm_event_mpa_req(struct nes_cm_event *event)
3816 {
3817 struct iw_cm_id *cm_id;
3818 struct iw_cm_event cm_event;
3819 int ret;
3820 struct nes_cm_node *cm_node;
3821 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3822 &cm_event.local_addr;
3823 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3824 &cm_event.remote_addr;
3825
3826 cm_node = event->cm_node;
3827 if (!cm_node)
3828 return;
3829 cm_id = cm_node->cm_id;
3830
3831 atomic_inc(&cm_connect_reqs);
3832 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3833 cm_node, cm_id, jiffies);
3834
3835 cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3836 cm_event.status = 0;
3837 cm_event.provider_data = (void *)cm_node;
3838
3839 cm_event_laddr->sin_family = AF_INET;
3840 cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3841 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3842
3843 cm_event_raddr->sin_family = AF_INET;
3844 cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3845 cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3846 cm_event.private_data = cm_node->mpa_frame_buf;
3847 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3848 if (cm_node->mpa_frame_rev == IETF_MPA_V1) {
3849 cm_event.ird = NES_MAX_IRD;
3850 cm_event.ord = NES_MAX_ORD;
3851 } else {
3852 cm_event.ird = cm_node->ird_size;
3853 cm_event.ord = cm_node->ord_size;
3854 }
3855
3856 ret = cm_id->event_handler(cm_id, &cm_event);
3857 if (ret)
3858 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3859 __func__, __LINE__, ret);
3860 return;
3861 }
3862
3863
3864 static void cm_event_mpa_reject(struct nes_cm_event *event)
3865 {
3866 struct iw_cm_id *cm_id;
3867 struct iw_cm_event cm_event;
3868 struct nes_cm_node *cm_node;
3869 int ret;
3870 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3871 &cm_event.local_addr;
3872 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3873 &cm_event.remote_addr;
3874
3875 cm_node = event->cm_node;
3876 if (!cm_node)
3877 return;
3878 cm_id = cm_node->cm_id;
3879
3880 atomic_inc(&cm_connect_reqs);
3881 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3882 cm_node, cm_id, jiffies);
3883
3884 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3885 cm_event.status = -ECONNREFUSED;
3886 cm_event.provider_data = cm_id->provider_data;
3887
3888 cm_event_laddr->sin_family = AF_INET;
3889 cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3890 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3891
3892 cm_event_raddr->sin_family = AF_INET;
3893 cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3894 cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3895
3896 cm_event.private_data = cm_node->mpa_frame_buf;
3897 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3898
3899 nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3900 "remove_addr=%08x\n",
3901 cm_event_laddr->sin_addr.s_addr,
3902 cm_event_raddr->sin_addr.s_addr);
3903
3904 ret = cm_id->event_handler(cm_id, &cm_event);
3905 if (ret)
3906 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3907 __func__, __LINE__, ret);
3908
3909 return;
3910 }
3911
3912
3913 static void nes_cm_event_handler(struct work_struct *);
3914
3915 /**
3916 * nes_cm_post_event
3917 * post an event to the cm event handler
3918 */
3919 static int nes_cm_post_event(struct nes_cm_event *event)
3920 {
3921 atomic_inc(&event->cm_node->cm_core->events_posted);
3922 add_ref_cm_node(event->cm_node);
3923 event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3924 INIT_WORK(&event->event_work, nes_cm_event_handler);
3925 nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3926 event->cm_node, event);
3927
3928 queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3929
3930 nes_debug(NES_DBG_CM, "Exit\n");
3931 return 0;
3932 }
3933
3934
3935 /**
3936 * nes_cm_event_handler
3937 * worker function to handle cm events
3938 * will free instance of nes_cm_event
3939 */
3940 static void nes_cm_event_handler(struct work_struct *work)
3941 {
3942 struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3943 event_work);
3944 struct nes_cm_core *cm_core;
3945
3946 if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3947 return;
3948
3949 cm_core = event->cm_node->cm_core;
3950 nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3951 event, event->type, atomic_read(&cm_core->events_posted));
3952
3953 switch (event->type) {
3954 case NES_CM_EVENT_MPA_REQ:
3955 cm_event_mpa_req(event);
3956 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3957 event->cm_node);
3958 break;
3959 case NES_CM_EVENT_RESET:
3960 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3961 event->cm_node);
3962 cm_event_reset(event);
3963 break;
3964 case NES_CM_EVENT_CONNECTED:
3965 if ((!event->cm_node->cm_id) ||
3966 (event->cm_node->state != NES_CM_STATE_TSA))
3967 break;
3968 cm_event_connected(event);
3969 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3970 break;
3971 case NES_CM_EVENT_MPA_REJECT:
3972 if ((!event->cm_node->cm_id) ||
3973 (event->cm_node->state == NES_CM_STATE_TSA))
3974 break;
3975 cm_event_mpa_reject(event);
3976 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3977 break;
3978
3979 case NES_CM_EVENT_ABORTED:
3980 if ((!event->cm_node->cm_id) ||
3981 (event->cm_node->state == NES_CM_STATE_TSA))
3982 break;
3983 cm_event_connect_error(event);
3984 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3985 break;
3986 case NES_CM_EVENT_DROPPED_PKT:
3987 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3988 break;
3989 default:
3990 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3991 break;
3992 }
3993
3994 atomic_dec(&cm_core->events_posted);
3995 event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3996 rem_ref_cm_node(cm_core, event->cm_node);
3997 kfree(event);
3998
3999 return;
4000 }
Linux with added FPC-III support