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[mirror_ubuntu-bionic-kernel.git] / drivers / infiniband / hw / nes / nes_cm.c
1 /*
2 * Copyright (c) 2006 - 2009 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34
35 #define TCPOPT_TIMESTAMP 8
36
37 #include <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
63 #include "nes.h"
64
65 u32 cm_packets_sent;
66 u32 cm_packets_bounced;
67 u32 cm_packets_dropped;
68 u32 cm_packets_retrans;
69 u32 cm_packets_created;
70 u32 cm_packets_received;
71 atomic_t cm_listens_created;
72 atomic_t cm_listens_destroyed;
73 u32 cm_backlog_drops;
74 atomic_t cm_loopbacks;
75 atomic_t cm_nodes_created;
76 atomic_t cm_nodes_destroyed;
77 atomic_t cm_accel_dropped_pkts;
78 atomic_t cm_resets_recvd;
79
80 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
81 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
82 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
83 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
84 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
85 static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
86 static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
87 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
88 static int mini_cm_dealloc_core(struct nes_cm_core *);
89 static int mini_cm_get(struct nes_cm_core *);
90 static int mini_cm_set(struct nes_cm_core *, u32, u32);
91
92 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
93 static int add_ref_cm_node(struct nes_cm_node *);
94 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
95
96 static int nes_cm_disconn_true(struct nes_qp *);
97 static int nes_cm_post_event(struct nes_cm_event *event);
98 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
99 static void nes_disconnect_worker(struct work_struct *work);
100
101 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
102 static int send_mpa_reject(struct nes_cm_node *);
103 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
104 static int send_reset(struct nes_cm_node *, struct sk_buff *);
105 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
106 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
107 static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
108
109 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
110 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
111 static void cleanup_retrans_entry(struct nes_cm_node *);
112 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
113 static void free_retrans_entry(struct nes_cm_node *cm_node);
114 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
115
116 /* CM event handler functions */
117 static void cm_event_connected(struct nes_cm_event *);
118 static void cm_event_connect_error(struct nes_cm_event *);
119 static void cm_event_reset(struct nes_cm_event *);
120 static void cm_event_mpa_req(struct nes_cm_event *);
121 static void cm_event_mpa_reject(struct nes_cm_event *);
122 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
123
124 /* MPA build functions */
125 static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
126 static void build_mpa_v2(struct nes_cm_node *, void *, u8);
127 static void build_mpa_v1(struct nes_cm_node *, void *, u8);
128 static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
129
130 static void print_core(struct nes_cm_core *core);
131
132 /* External CM API Interface */
133 /* instance of function pointers for client API */
134 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
135 static struct nes_cm_ops nes_cm_api = {
136 mini_cm_accelerated,
137 mini_cm_listen,
138 mini_cm_del_listen,
139 mini_cm_connect,
140 mini_cm_close,
141 mini_cm_accept,
142 mini_cm_reject,
143 mini_cm_recv_pkt,
144 mini_cm_dealloc_core,
145 mini_cm_get,
146 mini_cm_set
147 };
148
149 static struct nes_cm_core *g_cm_core;
150
151 atomic_t cm_connects;
152 atomic_t cm_accepts;
153 atomic_t cm_disconnects;
154 atomic_t cm_closes;
155 atomic_t cm_connecteds;
156 atomic_t cm_connect_reqs;
157 atomic_t cm_rejects;
158
159 int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
160 {
161 return add_ref_cm_node(cm_node);
162 }
163
164 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
165 {
166 return rem_ref_cm_node(cm_node->cm_core, cm_node);
167 }
168
169 /**
170 * create_event
171 */
172 static struct nes_cm_event *create_event(struct nes_cm_node * cm_node,
173 enum nes_cm_event_type type)
174 {
175 struct nes_cm_event *event;
176
177 if (!cm_node->cm_id)
178 return NULL;
179
180 /* allocate an empty event */
181 event = kzalloc(sizeof(*event), GFP_ATOMIC);
182
183 if (!event)
184 return NULL;
185
186 event->type = type;
187 event->cm_node = cm_node;
188 event->cm_info.rem_addr = cm_node->rem_addr;
189 event->cm_info.loc_addr = cm_node->loc_addr;
190 event->cm_info.rem_port = cm_node->rem_port;
191 event->cm_info.loc_port = cm_node->loc_port;
192 event->cm_info.cm_id = cm_node->cm_id;
193
194 nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
195 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
196 cm_node, event, type, event->cm_info.loc_addr,
197 event->cm_info.loc_port, event->cm_info.rem_addr,
198 event->cm_info.rem_port);
199
200 nes_cm_post_event(event);
201 return event;
202 }
203
204
205 /**
206 * send_mpa_request
207 */
208 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
209 {
210 u8 start_addr = 0;
211 u8 *start_ptr = &start_addr;
212 u8 **start_buff = &start_ptr;
213 u16 buff_len = 0;
214
215 if (!skb) {
216 nes_debug(NES_DBG_CM, "skb set to NULL\n");
217 return -1;
218 }
219
220 /* send an MPA Request frame */
221 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
222 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
223
224 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
225 }
226
227
228
229 static int send_mpa_reject(struct nes_cm_node *cm_node)
230 {
231 struct sk_buff *skb = NULL;
232 u8 start_addr = 0;
233 u8 *start_ptr = &start_addr;
234 u8 **start_buff = &start_ptr;
235 u16 buff_len = 0;
236
237 skb = dev_alloc_skb(MAX_CM_BUFFER);
238 if (!skb) {
239 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
240 return -ENOMEM;
241 }
242
243 /* send an MPA reject frame */
244 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
245 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
246
247 cm_node->state = NES_CM_STATE_FIN_WAIT1;
248 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
249 }
250
251
252 /**
253 * recv_mpa - process a received TCP pkt, we are expecting an
254 * IETF MPA frame
255 */
256 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
257 u32 len)
258 {
259 struct ietf_mpa_v1 *mpa_frame;
260 struct ietf_mpa_v2 *mpa_v2_frame;
261 struct ietf_rtr_msg *rtr_msg;
262 int mpa_hdr_len;
263 int priv_data_len;
264
265 *type = NES_MPA_REQUEST_ACCEPT;
266
267 /* assume req frame is in tcp data payload */
268 if (len < sizeof(struct ietf_mpa_v1)) {
269 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
270 return -EINVAL;
271 }
272
273 /* points to the beginning of the frame, which could be MPA V1 or V2 */
274 mpa_frame = (struct ietf_mpa_v1 *)buffer;
275 mpa_hdr_len = sizeof(struct ietf_mpa_v1);
276 priv_data_len = ntohs(mpa_frame->priv_data_len);
277
278 /* make sure mpa private data len is less than 512 bytes */
279 if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
280 nes_debug(NES_DBG_CM, "The received Length of Private"
281 " Data field exceeds 512 octets\n");
282 return -EINVAL;
283 }
284 /*
285 * make sure MPA receiver interoperate with the
286 * received MPA version and MPA key information
287 *
288 */
289 if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
290 nes_debug(NES_DBG_CM, "The received mpa version"
291 " is not supported\n");
292 return -EINVAL;
293 }
294 /*
295 * backwards compatibility only
296 */
297 if (mpa_frame->rev > cm_node->mpa_frame_rev) {
298 nes_debug(NES_DBG_CM, "The received mpa version"
299 " can not be interoperated\n");
300 return -EINVAL;
301 } else {
302 cm_node->mpa_frame_rev = mpa_frame->rev;
303 }
304
305 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
306 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
307 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
308 return -EINVAL;
309 }
310 } else {
311 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
312 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
313 return -EINVAL;
314 }
315 }
316
317
318 if (priv_data_len + mpa_hdr_len != len) {
319 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
320 " complete (%x + %x != %x)\n",
321 priv_data_len, mpa_hdr_len, len);
322 return -EINVAL;
323 }
324 /* make sure it does not exceed the max size */
325 if (len > MAX_CM_BUFFER) {
326 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
327 " (%x + %x != %x)\n",
328 priv_data_len, mpa_hdr_len, len);
329 return -EINVAL;
330 }
331
332 cm_node->mpa_frame_size = priv_data_len;
333
334 switch (mpa_frame->rev) {
335 case IETF_MPA_V2: {
336 u16 ird_size;
337 u16 ord_size;
338 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
339 mpa_hdr_len += IETF_RTR_MSG_SIZE;
340 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
341 rtr_msg = &mpa_v2_frame->rtr_msg;
342
343 /* parse rtr message */
344 rtr_msg->ctrl_ird = ntohs(rtr_msg->ctrl_ird);
345 rtr_msg->ctrl_ord = ntohs(rtr_msg->ctrl_ord);
346 ird_size = rtr_msg->ctrl_ird & IETF_NO_IRD_ORD;
347 ord_size = rtr_msg->ctrl_ord & IETF_NO_IRD_ORD;
348
349 if (!(rtr_msg->ctrl_ird & IETF_PEER_TO_PEER)) {
350 /* send reset */
351 return -EINVAL;
352 }
353
354 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
355 /* responder */
356 if (cm_node->ord_size > ird_size)
357 cm_node->ord_size = ird_size;
358 } else {
359 /* initiator */
360 if (cm_node->ord_size > ird_size)
361 cm_node->ord_size = ird_size;
362
363 if (cm_node->ird_size < ord_size) {
364 /* no resources available */
365 /* send terminate message */
366 return -EINVAL;
367 }
368 }
369
370 if (rtr_msg->ctrl_ord & IETF_RDMA0_READ) {
371 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
372 } else if (rtr_msg->ctrl_ord & IETF_RDMA0_WRITE) {
373 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
374 } else { /* Not supported RDMA0 operation */
375 return -EINVAL;
376 }
377 break;
378 }
379 case IETF_MPA_V1:
380 default:
381 break;
382 }
383
384 /* copy entire MPA frame to our cm_node's frame */
385 memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
386
387 if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
388 *type = NES_MPA_REQUEST_REJECT;
389 return 0;
390 }
391
392
393 /**
394 * form_cm_frame - get a free packet and build empty frame Use
395 * node info to build.
396 */
397 static void form_cm_frame(struct sk_buff *skb,
398 struct nes_cm_node *cm_node, void *options, u32 optionsize,
399 void *data, u32 datasize, u8 flags)
400 {
401 struct tcphdr *tcph;
402 struct iphdr *iph;
403 struct ethhdr *ethh;
404 u8 *buf;
405 u16 packetsize = sizeof(*iph);
406
407 packetsize += sizeof(*tcph);
408 packetsize += optionsize + datasize;
409
410 skb_trim(skb, 0);
411 memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
412
413 buf = skb_put(skb, packetsize + ETH_HLEN);
414
415 ethh = (struct ethhdr *)buf;
416 buf += ETH_HLEN;
417
418 iph = (struct iphdr *)buf;
419 buf += sizeof(*iph);
420 tcph = (struct tcphdr *)buf;
421 skb_reset_mac_header(skb);
422 skb_set_network_header(skb, ETH_HLEN);
423 skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
424 buf += sizeof(*tcph);
425
426 skb->ip_summed = CHECKSUM_PARTIAL;
427 skb->protocol = htons(0x800);
428 skb->data_len = 0;
429 skb->mac_len = ETH_HLEN;
430
431 memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
432 memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
433 ethh->h_proto = htons(0x0800);
434
435 iph->version = IPVERSION;
436 iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
437 iph->tos = 0;
438 iph->tot_len = htons(packetsize);
439 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
440
441 iph->frag_off = htons(0x4000);
442 iph->ttl = 0x40;
443 iph->protocol = 0x06; /* IPPROTO_TCP */
444
445 iph->saddr = htonl(cm_node->loc_addr);
446 iph->daddr = htonl(cm_node->rem_addr);
447
448 tcph->source = htons(cm_node->loc_port);
449 tcph->dest = htons(cm_node->rem_port);
450 tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
451
452 if (flags & SET_ACK) {
453 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
454 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
455 tcph->ack = 1;
456 } else {
457 tcph->ack_seq = 0;
458 }
459
460 if (flags & SET_SYN) {
461 cm_node->tcp_cntxt.loc_seq_num++;
462 tcph->syn = 1;
463 } else {
464 cm_node->tcp_cntxt.loc_seq_num += datasize;
465 }
466
467 if (flags & SET_FIN) {
468 cm_node->tcp_cntxt.loc_seq_num++;
469 tcph->fin = 1;
470 }
471
472 if (flags & SET_RST)
473 tcph->rst = 1;
474
475 tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
476 tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
477 tcph->urg_ptr = 0;
478 if (optionsize)
479 memcpy(buf, options, optionsize);
480 buf += optionsize;
481 if (datasize)
482 memcpy(buf, data, datasize);
483
484 skb_shinfo(skb)->nr_frags = 0;
485 cm_packets_created++;
486 }
487
488 /**
489 * print_core - dump a cm core
490 */
491 static void print_core(struct nes_cm_core *core)
492 {
493 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
494 nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
495 if (!core)
496 return;
497 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
498
499 nes_debug(NES_DBG_CM, "State : %u \n", core->state);
500
501 nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
502 nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
503
504 nes_debug(NES_DBG_CM, "core : %p \n", core);
505
506 nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
507 }
508
509 /**
510 * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
511 */
512 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
513 u16 *buff_len, u8 *pci_mem, u8 mpa_key)
514 {
515 int ret = 0;
516
517 *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
518
519 switch (cm_node->mpa_frame_rev) {
520 case IETF_MPA_V1:
521 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
522 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
523 build_mpa_v1(cm_node, *start_buff, mpa_key);
524 break;
525 case IETF_MPA_V2:
526 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
527 build_mpa_v2(cm_node, *start_buff, mpa_key);
528 break;
529 default:
530 ret = -EINVAL;
531 }
532 return ret;
533 }
534
535 /**
536 * build_mpa_v2 - build a MPA V2 frame
537 */
538 static void build_mpa_v2(struct nes_cm_node *cm_node,
539 void *start_addr, u8 mpa_key)
540 {
541 struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
542 struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
543
544 /* initialize the upper 5 bytes of the frame */
545 build_mpa_v1(cm_node, start_addr, mpa_key);
546 mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
547 mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
548
549 /* initialize RTR msg */
550 rtr_msg->ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
551 IETF_NO_IRD_ORD : cm_node->ird_size;
552 rtr_msg->ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
553 IETF_NO_IRD_ORD : cm_node->ord_size;
554
555 rtr_msg->ctrl_ird |= IETF_PEER_TO_PEER;
556 rtr_msg->ctrl_ird |= IETF_FLPDU_ZERO_LEN;
557
558 switch (mpa_key) {
559 case MPA_KEY_REQUEST:
560 rtr_msg->ctrl_ord |= IETF_RDMA0_WRITE;
561 rtr_msg->ctrl_ord |= IETF_RDMA0_READ;
562 break;
563 case MPA_KEY_REPLY:
564 switch (cm_node->send_rdma0_op) {
565 case SEND_RDMA_WRITE_ZERO:
566 rtr_msg->ctrl_ord |= IETF_RDMA0_WRITE;
567 break;
568 case SEND_RDMA_READ_ZERO:
569 rtr_msg->ctrl_ord |= IETF_RDMA0_READ;
570 break;
571 }
572 }
573 rtr_msg->ctrl_ird = htons(rtr_msg->ctrl_ird);
574 rtr_msg->ctrl_ord = htons(rtr_msg->ctrl_ord);
575 }
576
577 /**
578 * build_mpa_v1 - build a MPA V1 frame
579 */
580 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
581 {
582 struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
583
584 switch (mpa_key) {
585 case MPA_KEY_REQUEST:
586 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
587 break;
588 case MPA_KEY_REPLY:
589 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
590 break;
591 }
592 mpa_frame->flags = IETF_MPA_FLAGS_CRC;
593 mpa_frame->rev = cm_node->mpa_frame_rev;
594 mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
595 }
596
597 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
598 {
599 u64 u64temp;
600 struct nes_qp *nesqp = *nesqp_addr;
601 struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
602
603 u64temp = (unsigned long)nesqp;
604 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
605 set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
606
607 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
608 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
609
610 switch (cm_node->send_rdma0_op) {
611 case SEND_RDMA_WRITE_ZERO:
612 nes_debug(NES_DBG_CM, "Sending first write.\n");
613 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
614 cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
615 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
616 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
617 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
618 break;
619
620 case SEND_RDMA_READ_ZERO:
621 default:
622 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO) {
623 printk(KERN_ERR "%s[%u]: Unsupported RDMA0 len operation=%u\n",
624 __func__, __LINE__, cm_node->send_rdma0_op);
625 WARN_ON(1);
626 }
627 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
628 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
629 cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
630 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
631 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
632 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
633 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
634 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
635 break;
636 }
637
638 if (nesqp->sq_kmapped) {
639 nesqp->sq_kmapped = 0;
640 kunmap(nesqp->page);
641 }
642
643 /*use the reserved spot on the WQ for the extra first WQE*/
644 nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
645 NES_QPCONTEXT_ORDIRD_WRPDU |
646 NES_QPCONTEXT_ORDIRD_ALSMM));
647 nesqp->skip_lsmm = 1;
648 nesqp->hwqp.sq_tail = 0;
649 }
650
651 /**
652 * schedule_nes_timer
653 * note - cm_node needs to be protected before calling this. Encase in:
654 * rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
655 */
656 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
657 enum nes_timer_type type, int send_retrans,
658 int close_when_complete)
659 {
660 unsigned long flags;
661 struct nes_cm_core *cm_core = cm_node->cm_core;
662 struct nes_timer_entry *new_send;
663 int ret = 0;
664 u32 was_timer_set;
665
666 new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
667 if (!new_send)
668 return -ENOMEM;
669
670 /* new_send->timetosend = currenttime */
671 new_send->retrycount = NES_DEFAULT_RETRYS;
672 new_send->retranscount = NES_DEFAULT_RETRANS;
673 new_send->skb = skb;
674 new_send->timetosend = jiffies;
675 new_send->type = type;
676 new_send->netdev = cm_node->netdev;
677 new_send->send_retrans = send_retrans;
678 new_send->close_when_complete = close_when_complete;
679
680 if (type == NES_TIMER_TYPE_CLOSE) {
681 new_send->timetosend += (HZ / 10);
682 if (cm_node->recv_entry) {
683 kfree(new_send);
684 WARN_ON(1);
685 return -EINVAL;
686 }
687 cm_node->recv_entry = new_send;
688 }
689
690 if (type == NES_TIMER_TYPE_SEND) {
691 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
692 atomic_inc(&new_send->skb->users);
693 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
694 cm_node->send_entry = new_send;
695 add_ref_cm_node(cm_node);
696 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
697 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
698
699 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
700 if (ret != NETDEV_TX_OK) {
701 nes_debug(NES_DBG_CM, "Error sending packet %p "
702 "(jiffies = %lu)\n", new_send, jiffies);
703 new_send->timetosend = jiffies;
704 ret = NETDEV_TX_OK;
705 } else {
706 cm_packets_sent++;
707 if (!send_retrans) {
708 cleanup_retrans_entry(cm_node);
709 if (close_when_complete)
710 rem_ref_cm_node(cm_core, cm_node);
711 return ret;
712 }
713 }
714 }
715
716 was_timer_set = timer_pending(&cm_core->tcp_timer);
717
718 if (!was_timer_set) {
719 cm_core->tcp_timer.expires = new_send->timetosend;
720 add_timer(&cm_core->tcp_timer);
721 }
722
723 return ret;
724 }
725
726 static void nes_retrans_expired(struct nes_cm_node *cm_node)
727 {
728 struct iw_cm_id *cm_id = cm_node->cm_id;
729 enum nes_cm_node_state state = cm_node->state;
730 cm_node->state = NES_CM_STATE_CLOSED;
731
732 switch (state) {
733 case NES_CM_STATE_SYN_RCVD:
734 case NES_CM_STATE_CLOSING:
735 rem_ref_cm_node(cm_node->cm_core, cm_node);
736 break;
737 case NES_CM_STATE_LAST_ACK:
738 case NES_CM_STATE_FIN_WAIT1:
739 if (cm_node->cm_id)
740 cm_id->rem_ref(cm_id);
741 send_reset(cm_node, NULL);
742 break;
743 default:
744 add_ref_cm_node(cm_node);
745 send_reset(cm_node, NULL);
746 create_event(cm_node, NES_CM_EVENT_ABORTED);
747 }
748 }
749
750 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
751 {
752 struct nes_timer_entry *recv_entry = cm_node->recv_entry;
753 struct iw_cm_id *cm_id = cm_node->cm_id;
754 struct nes_qp *nesqp;
755 unsigned long qplockflags;
756
757 if (!recv_entry)
758 return;
759 nesqp = (struct nes_qp *)recv_entry->skb;
760 if (nesqp) {
761 spin_lock_irqsave(&nesqp->lock, qplockflags);
762 if (nesqp->cm_id) {
763 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
764 "refcount = %d: HIT A "
765 "NES_TIMER_TYPE_CLOSE with something "
766 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
767 atomic_read(&nesqp->refcount));
768 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
769 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
770 nesqp->ibqp_state = IB_QPS_ERR;
771 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
772 nes_cm_disconn(nesqp);
773 } else {
774 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
775 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
776 "refcount = %d: HIT A "
777 "NES_TIMER_TYPE_CLOSE with nothing "
778 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
779 atomic_read(&nesqp->refcount));
780 }
781 } else if (rem_node) {
782 /* TIME_WAIT state */
783 rem_ref_cm_node(cm_node->cm_core, cm_node);
784 }
785 if (cm_node->cm_id)
786 cm_id->rem_ref(cm_id);
787 kfree(recv_entry);
788 cm_node->recv_entry = NULL;
789 }
790
791 /**
792 * nes_cm_timer_tick
793 */
794 static void nes_cm_timer_tick(unsigned long pass)
795 {
796 unsigned long flags;
797 unsigned long nexttimeout = jiffies + NES_LONG_TIME;
798 struct nes_cm_node *cm_node;
799 struct nes_timer_entry *send_entry, *recv_entry;
800 struct list_head *list_core_temp;
801 struct list_head *list_node;
802 struct nes_cm_core *cm_core = g_cm_core;
803 u32 settimer = 0;
804 unsigned long timetosend;
805 int ret = NETDEV_TX_OK;
806
807 struct list_head timer_list;
808
809 INIT_LIST_HEAD(&timer_list);
810 spin_lock_irqsave(&cm_core->ht_lock, flags);
811
812 list_for_each_safe(list_node, list_core_temp,
813 &cm_core->connected_nodes) {
814 cm_node = container_of(list_node, struct nes_cm_node, list);
815 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
816 add_ref_cm_node(cm_node);
817 list_add(&cm_node->timer_entry, &timer_list);
818 }
819 }
820 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
821
822 list_for_each_safe(list_node, list_core_temp, &timer_list) {
823 cm_node = container_of(list_node, struct nes_cm_node,
824 timer_entry);
825 recv_entry = cm_node->recv_entry;
826
827 if (recv_entry) {
828 if (time_after(recv_entry->timetosend, jiffies)) {
829 if (nexttimeout > recv_entry->timetosend ||
830 !settimer) {
831 nexttimeout = recv_entry->timetosend;
832 settimer = 1;
833 }
834 } else {
835 handle_recv_entry(cm_node, 1);
836 }
837 }
838
839 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
840 do {
841 send_entry = cm_node->send_entry;
842 if (!send_entry)
843 break;
844 if (time_after(send_entry->timetosend, jiffies)) {
845 if (cm_node->state != NES_CM_STATE_TSA) {
846 if ((nexttimeout >
847 send_entry->timetosend) ||
848 !settimer) {
849 nexttimeout =
850 send_entry->timetosend;
851 settimer = 1;
852 }
853 } else {
854 free_retrans_entry(cm_node);
855 }
856 break;
857 }
858
859 if ((cm_node->state == NES_CM_STATE_TSA) ||
860 (cm_node->state == NES_CM_STATE_CLOSED)) {
861 free_retrans_entry(cm_node);
862 break;
863 }
864
865 if (!send_entry->retranscount ||
866 !send_entry->retrycount) {
867 cm_packets_dropped++;
868 free_retrans_entry(cm_node);
869
870 spin_unlock_irqrestore(
871 &cm_node->retrans_list_lock, flags);
872 nes_retrans_expired(cm_node);
873 cm_node->state = NES_CM_STATE_CLOSED;
874 spin_lock_irqsave(&cm_node->retrans_list_lock,
875 flags);
876 break;
877 }
878 atomic_inc(&send_entry->skb->users);
879 cm_packets_retrans++;
880 nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
881 "for node %p, jiffies = %lu, time to send = "
882 "%lu, retranscount = %u, send_entry->seq_num = "
883 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
884 "0x%08X\n", send_entry, cm_node, jiffies,
885 send_entry->timetosend,
886 send_entry->retranscount,
887 send_entry->seq_num,
888 cm_node->tcp_cntxt.rem_ack_num);
889
890 spin_unlock_irqrestore(&cm_node->retrans_list_lock,
891 flags);
892 ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
893 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
894 if (ret != NETDEV_TX_OK) {
895 nes_debug(NES_DBG_CM, "rexmit failed for "
896 "node=%p\n", cm_node);
897 cm_packets_bounced++;
898 send_entry->retrycount--;
899 nexttimeout = jiffies + NES_SHORT_TIME;
900 settimer = 1;
901 break;
902 } else {
903 cm_packets_sent++;
904 }
905 nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
906 "%u, retry count = %u.\n",
907 send_entry->retranscount,
908 send_entry->retrycount);
909 if (send_entry->send_retrans) {
910 send_entry->retranscount--;
911 timetosend = (NES_RETRY_TIMEOUT <<
912 (NES_DEFAULT_RETRANS - send_entry->retranscount));
913
914 send_entry->timetosend = jiffies +
915 min(timetosend, NES_MAX_TIMEOUT);
916 if (nexttimeout > send_entry->timetosend ||
917 !settimer) {
918 nexttimeout = send_entry->timetosend;
919 settimer = 1;
920 }
921 } else {
922 int close_when_complete;
923 close_when_complete =
924 send_entry->close_when_complete;
925 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
926 cm_node, cm_node->state);
927 free_retrans_entry(cm_node);
928 if (close_when_complete)
929 rem_ref_cm_node(cm_node->cm_core,
930 cm_node);
931 }
932 } while (0);
933
934 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
935 rem_ref_cm_node(cm_node->cm_core, cm_node);
936 }
937
938 if (settimer) {
939 if (!timer_pending(&cm_core->tcp_timer)) {
940 cm_core->tcp_timer.expires = nexttimeout;
941 add_timer(&cm_core->tcp_timer);
942 }
943 }
944 }
945
946
947 /**
948 * send_syn
949 */
950 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
951 struct sk_buff *skb)
952 {
953 int ret;
954 int flags = SET_SYN;
955 char optionsbuffer[sizeof(struct option_mss) +
956 sizeof(struct option_windowscale) + sizeof(struct option_base) +
957 TCP_OPTIONS_PADDING];
958
959 int optionssize = 0;
960 /* Sending MSS option */
961 union all_known_options *options;
962
963 if (!cm_node)
964 return -EINVAL;
965
966 options = (union all_known_options *)&optionsbuffer[optionssize];
967 options->as_mss.optionnum = OPTION_NUMBER_MSS;
968 options->as_mss.length = sizeof(struct option_mss);
969 options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
970 optionssize += sizeof(struct option_mss);
971
972 options = (union all_known_options *)&optionsbuffer[optionssize];
973 options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
974 options->as_windowscale.length = sizeof(struct option_windowscale);
975 options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
976 optionssize += sizeof(struct option_windowscale);
977
978 if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
979 options = (union all_known_options *)&optionsbuffer[optionssize];
980 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
981 options->as_base.length = sizeof(struct option_base);
982 optionssize += sizeof(struct option_base);
983 /* we need the size to be a multiple of 4 */
984 options = (union all_known_options *)&optionsbuffer[optionssize];
985 options->as_end = 1;
986 optionssize += 1;
987 options = (union all_known_options *)&optionsbuffer[optionssize];
988 options->as_end = 1;
989 optionssize += 1;
990 }
991
992 options = (union all_known_options *)&optionsbuffer[optionssize];
993 options->as_end = OPTION_NUMBER_END;
994 optionssize += 1;
995
996 if (!skb)
997 skb = dev_alloc_skb(MAX_CM_BUFFER);
998 if (!skb) {
999 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1000 return -1;
1001 }
1002
1003 if (sendack)
1004 flags |= SET_ACK;
1005
1006 form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1007 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1008
1009 return ret;
1010 }
1011
1012
1013 /**
1014 * send_reset
1015 */
1016 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1017 {
1018 int ret;
1019 int flags = SET_RST | SET_ACK;
1020
1021 if (!skb)
1022 skb = dev_alloc_skb(MAX_CM_BUFFER);
1023 if (!skb) {
1024 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1025 return -ENOMEM;
1026 }
1027
1028 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1029 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1030
1031 return ret;
1032 }
1033
1034
1035 /**
1036 * send_ack
1037 */
1038 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1039 {
1040 int ret;
1041
1042 if (!skb)
1043 skb = dev_alloc_skb(MAX_CM_BUFFER);
1044
1045 if (!skb) {
1046 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1047 return -1;
1048 }
1049
1050 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1051 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1052
1053 return ret;
1054 }
1055
1056
1057 /**
1058 * send_fin
1059 */
1060 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1061 {
1062 int ret;
1063
1064 /* if we didn't get a frame get one */
1065 if (!skb)
1066 skb = dev_alloc_skb(MAX_CM_BUFFER);
1067
1068 if (!skb) {
1069 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1070 return -1;
1071 }
1072
1073 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1074 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1075
1076 return ret;
1077 }
1078
1079
1080 /**
1081 * find_node - find a cm node that matches the reference cm node
1082 */
1083 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1084 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1085 {
1086 unsigned long flags;
1087 struct list_head *hte;
1088 struct nes_cm_node *cm_node;
1089
1090 /* get a handle on the hte */
1091 hte = &cm_core->connected_nodes;
1092
1093 /* walk list and find cm_node associated with this session ID */
1094 spin_lock_irqsave(&cm_core->ht_lock, flags);
1095 list_for_each_entry(cm_node, hte, list) {
1096 /* compare quad, return node handle if a match */
1097 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1098 cm_node->loc_addr, cm_node->loc_port,
1099 loc_addr, loc_port,
1100 cm_node->rem_addr, cm_node->rem_port,
1101 rem_addr, rem_port);
1102 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
1103 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
1104 add_ref_cm_node(cm_node);
1105 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1106 return cm_node;
1107 }
1108 }
1109 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1110
1111 /* no owner node */
1112 return NULL;
1113 }
1114
1115
1116 /**
1117 * find_listener - find a cm node listening on this addr-port pair
1118 */
1119 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1120 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
1121 {
1122 unsigned long flags;
1123 struct nes_cm_listener *listen_node;
1124
1125 /* walk list and find cm_node associated with this session ID */
1126 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1127 list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1128 /* compare node pair, return node handle if a match */
1129 if (((listen_node->loc_addr == dst_addr) ||
1130 listen_node->loc_addr == 0x00000000) &&
1131 (listen_node->loc_port == dst_port) &&
1132 (listener_state & listen_node->listener_state)) {
1133 atomic_inc(&listen_node->ref_count);
1134 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1135 return listen_node;
1136 }
1137 }
1138 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1139
1140 /* no listener */
1141 return NULL;
1142 }
1143
1144
1145 /**
1146 * add_hte_node - add a cm node to the hash table
1147 */
1148 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1149 {
1150 unsigned long flags;
1151 struct list_head *hte;
1152
1153 if (!cm_node || !cm_core)
1154 return -EINVAL;
1155
1156 nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1157 cm_node);
1158
1159 spin_lock_irqsave(&cm_core->ht_lock, flags);
1160
1161 /* get a handle on the hash table element (list head for this slot) */
1162 hte = &cm_core->connected_nodes;
1163 list_add_tail(&cm_node->list, hte);
1164 atomic_inc(&cm_core->ht_node_cnt);
1165
1166 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1167
1168 return 0;
1169 }
1170
1171
1172 /**
1173 * mini_cm_dec_refcnt_listen
1174 */
1175 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1176 struct nes_cm_listener *listener, int free_hanging_nodes)
1177 {
1178 int ret = -EINVAL;
1179 int err = 0;
1180 unsigned long flags;
1181 struct list_head *list_pos = NULL;
1182 struct list_head *list_temp = NULL;
1183 struct nes_cm_node *cm_node = NULL;
1184 struct list_head reset_list;
1185
1186 nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1187 "refcnt=%d\n", listener, free_hanging_nodes,
1188 atomic_read(&listener->ref_count));
1189 /* free non-accelerated child nodes for this listener */
1190 INIT_LIST_HEAD(&reset_list);
1191 if (free_hanging_nodes) {
1192 spin_lock_irqsave(&cm_core->ht_lock, flags);
1193 list_for_each_safe(list_pos, list_temp,
1194 &g_cm_core->connected_nodes) {
1195 cm_node = container_of(list_pos, struct nes_cm_node,
1196 list);
1197 if ((cm_node->listener == listener) &&
1198 (!cm_node->accelerated)) {
1199 add_ref_cm_node(cm_node);
1200 list_add(&cm_node->reset_entry, &reset_list);
1201 }
1202 }
1203 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1204 }
1205
1206 list_for_each_safe(list_pos, list_temp, &reset_list) {
1207 cm_node = container_of(list_pos, struct nes_cm_node,
1208 reset_entry);
1209 {
1210 struct nes_cm_node *loopback = cm_node->loopbackpartner;
1211 enum nes_cm_node_state old_state;
1212 if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1213 rem_ref_cm_node(cm_node->cm_core, cm_node);
1214 } else {
1215 if (!loopback) {
1216 cleanup_retrans_entry(cm_node);
1217 err = send_reset(cm_node, NULL);
1218 if (err) {
1219 cm_node->state =
1220 NES_CM_STATE_CLOSED;
1221 WARN_ON(1);
1222 } else {
1223 old_state = cm_node->state;
1224 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1225 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1226 rem_ref_cm_node(
1227 cm_node->cm_core,
1228 cm_node);
1229 }
1230 } else {
1231 struct nes_cm_event event;
1232
1233 event.cm_node = loopback;
1234 event.cm_info.rem_addr =
1235 loopback->rem_addr;
1236 event.cm_info.loc_addr =
1237 loopback->loc_addr;
1238 event.cm_info.rem_port =
1239 loopback->rem_port;
1240 event.cm_info.loc_port =
1241 loopback->loc_port;
1242 event.cm_info.cm_id = loopback->cm_id;
1243 add_ref_cm_node(loopback);
1244 loopback->state = NES_CM_STATE_CLOSED;
1245 cm_event_connect_error(&event);
1246 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1247
1248 rem_ref_cm_node(cm_node->cm_core,
1249 cm_node);
1250
1251 }
1252 }
1253 }
1254 }
1255
1256 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1257 if (!atomic_dec_return(&listener->ref_count)) {
1258 list_del(&listener->list);
1259
1260 /* decrement our listen node count */
1261 atomic_dec(&cm_core->listen_node_cnt);
1262
1263 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1264
1265 if (listener->nesvnic)
1266 nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1267 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1268
1269 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1270
1271 kfree(listener);
1272 listener = NULL;
1273 ret = 0;
1274 atomic_inc(&cm_listens_destroyed);
1275 } else {
1276 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1277 }
1278 if (listener) {
1279 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1280 nes_debug(NES_DBG_CM, "destroying listener (%p)"
1281 " with non-zero pending accepts=%u\n",
1282 listener, atomic_read(&listener->pend_accepts_cnt));
1283 }
1284
1285 return ret;
1286 }
1287
1288
1289 /**
1290 * mini_cm_del_listen
1291 */
1292 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1293 struct nes_cm_listener *listener)
1294 {
1295 listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1296 listener->cm_id = NULL; /* going to be destroyed pretty soon */
1297 return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1298 }
1299
1300
1301 /**
1302 * mini_cm_accelerated
1303 */
1304 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1305 struct nes_cm_node *cm_node)
1306 {
1307 u32 was_timer_set;
1308
1309 cm_node->accelerated = 1;
1310
1311 if (cm_node->accept_pend) {
1312 BUG_ON(!cm_node->listener);
1313 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1314 cm_node->accept_pend = 0;
1315 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1316 }
1317
1318 was_timer_set = timer_pending(&cm_core->tcp_timer);
1319 if (!was_timer_set) {
1320 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1321 add_timer(&cm_core->tcp_timer);
1322 }
1323
1324 return 0;
1325 }
1326
1327
1328 /**
1329 * nes_addr_resolve_neigh
1330 */
1331 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1332 {
1333 struct rtable *rt;
1334 struct neighbour *neigh;
1335 int rc = arpindex;
1336 struct net_device *netdev;
1337 struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1338
1339 rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
1340 if (IS_ERR(rt)) {
1341 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1342 __func__, dst_ip);
1343 return rc;
1344 }
1345
1346 if (netif_is_bond_slave(nesvnic->netdev))
1347 netdev = nesvnic->netdev->master;
1348 else
1349 netdev = nesvnic->netdev;
1350
1351 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, netdev);
1352 if (neigh) {
1353 if (neigh->nud_state & NUD_VALID) {
1354 nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1355 " is %pM, Gateway is 0x%08X \n", dst_ip,
1356 neigh->ha, ntohl(rt->rt_gateway));
1357
1358 if (arpindex >= 0) {
1359 if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1360 neigh->ha, ETH_ALEN)) {
1361 /* Mac address same as in nes_arp_table */
1362 neigh_release(neigh);
1363 ip_rt_put(rt);
1364 return rc;
1365 }
1366
1367 nes_manage_arp_cache(nesvnic->netdev,
1368 nesadapter->arp_table[arpindex].mac_addr,
1369 dst_ip, NES_ARP_DELETE);
1370 }
1371
1372 nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1373 dst_ip, NES_ARP_ADD);
1374 rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1375 NES_ARP_RESOLVE);
1376 }
1377 neigh_release(neigh);
1378 }
1379
1380 if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID))) {
1381 rcu_read_lock();
1382 neigh_event_send(dst_get_neighbour_noref(&rt->dst), NULL);
1383 rcu_read_unlock();
1384 }
1385 ip_rt_put(rt);
1386 return rc;
1387 }
1388
1389 /**
1390 * make_cm_node - create a new instance of a cm node
1391 */
1392 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1393 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1394 struct nes_cm_listener *listener)
1395 {
1396 struct nes_cm_node *cm_node;
1397 struct timespec ts;
1398 int oldarpindex = 0;
1399 int arpindex = 0;
1400 struct nes_device *nesdev;
1401 struct nes_adapter *nesadapter;
1402
1403 /* create an hte and cm_node for this instance */
1404 cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1405 if (!cm_node)
1406 return NULL;
1407
1408 /* set our node specific transport info */
1409 cm_node->loc_addr = cm_info->loc_addr;
1410 cm_node->rem_addr = cm_info->rem_addr;
1411 cm_node->loc_port = cm_info->loc_port;
1412 cm_node->rem_port = cm_info->rem_port;
1413
1414 cm_node->mpa_frame_rev = mpa_version;
1415 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1416 cm_node->ird_size = IETF_NO_IRD_ORD;
1417 cm_node->ord_size = IETF_NO_IRD_ORD;
1418
1419 nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1420 &cm_node->loc_addr, cm_node->loc_port,
1421 &cm_node->rem_addr, cm_node->rem_port);
1422 cm_node->listener = listener;
1423 cm_node->netdev = nesvnic->netdev;
1424 cm_node->cm_id = cm_info->cm_id;
1425 memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1426
1427 nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1428 cm_node->cm_id);
1429
1430 spin_lock_init(&cm_node->retrans_list_lock);
1431
1432 cm_node->loopbackpartner = NULL;
1433 atomic_set(&cm_node->ref_count, 1);
1434 /* associate our parent CM core */
1435 cm_node->cm_core = cm_core;
1436 cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1437 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1438 cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1439 NES_CM_DEFAULT_RCV_WND_SCALE;
1440 ts = current_kernel_time();
1441 cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1442 cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1443 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1444 cm_node->tcp_cntxt.rcv_nxt = 0;
1445 /* get a unique session ID , add thread_id to an upcounter to handle race */
1446 atomic_inc(&cm_core->node_cnt);
1447 cm_node->conn_type = cm_info->conn_type;
1448 cm_node->apbvt_set = 0;
1449 cm_node->accept_pend = 0;
1450
1451 cm_node->nesvnic = nesvnic;
1452 /* get some device handles, for arp lookup */
1453 nesdev = nesvnic->nesdev;
1454 nesadapter = nesdev->nesadapter;
1455
1456 cm_node->loopbackpartner = NULL;
1457
1458 /* get the mac addr for the remote node */
1459 if (ipv4_is_loopback(htonl(cm_node->rem_addr))) {
1460 arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
1461 } else {
1462 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
1463 arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
1464 }
1465 if (arpindex < 0) {
1466 kfree(cm_node);
1467 return NULL;
1468 }
1469
1470 /* copy the mac addr to node context */
1471 memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1472 nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1473 cm_node->rem_mac);
1474
1475 add_hte_node(cm_core, cm_node);
1476 atomic_inc(&cm_nodes_created);
1477
1478 return cm_node;
1479 }
1480
1481
1482 /**
1483 * add_ref_cm_node - destroy an instance of a cm node
1484 */
1485 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1486 {
1487 atomic_inc(&cm_node->ref_count);
1488 return 0;
1489 }
1490
1491
1492 /**
1493 * rem_ref_cm_node - destroy an instance of a cm node
1494 */
1495 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1496 struct nes_cm_node *cm_node)
1497 {
1498 unsigned long flags;
1499 struct nes_qp *nesqp;
1500
1501 if (!cm_node)
1502 return -EINVAL;
1503
1504 spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1505 if (atomic_dec_return(&cm_node->ref_count)) {
1506 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1507 return 0;
1508 }
1509 list_del(&cm_node->list);
1510 atomic_dec(&cm_core->ht_node_cnt);
1511 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1512
1513 /* if the node is destroyed before connection was accelerated */
1514 if (!cm_node->accelerated && cm_node->accept_pend) {
1515 BUG_ON(!cm_node->listener);
1516 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1517 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1518 }
1519 WARN_ON(cm_node->send_entry);
1520 if (cm_node->recv_entry)
1521 handle_recv_entry(cm_node, 0);
1522 if (cm_node->listener) {
1523 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1524 } else {
1525 if (cm_node->apbvt_set && cm_node->nesvnic) {
1526 nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1527 PCI_FUNC(
1528 cm_node->nesvnic->nesdev->pcidev->devfn),
1529 NES_MANAGE_APBVT_DEL);
1530 }
1531 }
1532
1533 atomic_dec(&cm_core->node_cnt);
1534 atomic_inc(&cm_nodes_destroyed);
1535 nesqp = cm_node->nesqp;
1536 if (nesqp) {
1537 nesqp->cm_node = NULL;
1538 nes_rem_ref(&nesqp->ibqp);
1539 cm_node->nesqp = NULL;
1540 }
1541
1542 kfree(cm_node);
1543 return 0;
1544 }
1545
1546 /**
1547 * process_options
1548 */
1549 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1550 u32 optionsize, u32 syn_packet)
1551 {
1552 u32 tmp;
1553 u32 offset = 0;
1554 union all_known_options *all_options;
1555 char got_mss_option = 0;
1556
1557 while (offset < optionsize) {
1558 all_options = (union all_known_options *)(optionsloc + offset);
1559 switch (all_options->as_base.optionnum) {
1560 case OPTION_NUMBER_END:
1561 offset = optionsize;
1562 break;
1563 case OPTION_NUMBER_NONE:
1564 offset += 1;
1565 continue;
1566 case OPTION_NUMBER_MSS:
1567 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1568 "Size: %d\n", __func__,
1569 all_options->as_mss.length, offset, optionsize);
1570 got_mss_option = 1;
1571 if (all_options->as_mss.length != 4) {
1572 return 1;
1573 } else {
1574 tmp = ntohs(all_options->as_mss.mss);
1575 if (tmp > 0 && tmp <
1576 cm_node->tcp_cntxt.mss)
1577 cm_node->tcp_cntxt.mss = tmp;
1578 }
1579 break;
1580 case OPTION_NUMBER_WINDOW_SCALE:
1581 cm_node->tcp_cntxt.snd_wscale =
1582 all_options->as_windowscale.shiftcount;
1583 break;
1584 default:
1585 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1586 all_options->as_base.optionnum);
1587 break;
1588 }
1589 offset += all_options->as_base.length;
1590 }
1591 if ((!got_mss_option) && (syn_packet))
1592 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1593 return 0;
1594 }
1595
1596 static void drop_packet(struct sk_buff *skb)
1597 {
1598 atomic_inc(&cm_accel_dropped_pkts);
1599 dev_kfree_skb_any(skb);
1600 }
1601
1602 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1603 {
1604 nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1605 "refcnt=%d\n", cm_node, cm_node->state,
1606 atomic_read(&cm_node->ref_count));
1607 switch (cm_node->state) {
1608 case NES_CM_STATE_SYN_RCVD:
1609 case NES_CM_STATE_SYN_SENT:
1610 case NES_CM_STATE_ESTABLISHED:
1611 case NES_CM_STATE_MPAREJ_RCVD:
1612 cm_node->tcp_cntxt.rcv_nxt++;
1613 cleanup_retrans_entry(cm_node);
1614 cm_node->state = NES_CM_STATE_LAST_ACK;
1615 send_fin(cm_node, NULL);
1616 break;
1617 case NES_CM_STATE_MPAREQ_SENT:
1618 create_event(cm_node, NES_CM_EVENT_ABORTED);
1619 cm_node->tcp_cntxt.rcv_nxt++;
1620 cleanup_retrans_entry(cm_node);
1621 cm_node->state = NES_CM_STATE_CLOSED;
1622 add_ref_cm_node(cm_node);
1623 send_reset(cm_node, NULL);
1624 break;
1625 case NES_CM_STATE_FIN_WAIT1:
1626 cm_node->tcp_cntxt.rcv_nxt++;
1627 cleanup_retrans_entry(cm_node);
1628 cm_node->state = NES_CM_STATE_CLOSING;
1629 send_ack(cm_node, NULL);
1630 /* Wait for ACK as this is simultaneous close..
1631 * After we receive ACK, do not send anything..
1632 * Just rm the node.. Done.. */
1633 break;
1634 case NES_CM_STATE_FIN_WAIT2:
1635 cm_node->tcp_cntxt.rcv_nxt++;
1636 cleanup_retrans_entry(cm_node);
1637 cm_node->state = NES_CM_STATE_TIME_WAIT;
1638 send_ack(cm_node, NULL);
1639 schedule_nes_timer(cm_node, NULL, NES_TIMER_TYPE_CLOSE, 1, 0);
1640 break;
1641 case NES_CM_STATE_TIME_WAIT:
1642 cm_node->tcp_cntxt.rcv_nxt++;
1643 cleanup_retrans_entry(cm_node);
1644 cm_node->state = NES_CM_STATE_CLOSED;
1645 rem_ref_cm_node(cm_node->cm_core, cm_node);
1646 break;
1647 case NES_CM_STATE_TSA:
1648 default:
1649 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1650 cm_node, cm_node->state);
1651 break;
1652 }
1653 }
1654
1655
1656 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1657 struct tcphdr *tcph)
1658 {
1659
1660 int reset = 0; /* whether to send reset in case of err.. */
1661 atomic_inc(&cm_resets_recvd);
1662 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1663 " refcnt=%d\n", cm_node, cm_node->state,
1664 atomic_read(&cm_node->ref_count));
1665 cleanup_retrans_entry(cm_node);
1666 switch (cm_node->state) {
1667 case NES_CM_STATE_SYN_SENT:
1668 case NES_CM_STATE_MPAREQ_SENT:
1669 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1670 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1671 cm_node->listener, cm_node->state);
1672 switch (cm_node->mpa_frame_rev) {
1673 case IETF_MPA_V2:
1674 cm_node->mpa_frame_rev = IETF_MPA_V1;
1675 /* send a syn and goto syn sent state */
1676 cm_node->state = NES_CM_STATE_SYN_SENT;
1677 if (send_syn(cm_node, 0, NULL)) {
1678 active_open_err(cm_node, skb, reset);
1679 }
1680 break;
1681 case IETF_MPA_V1:
1682 default:
1683 active_open_err(cm_node, skb, reset);
1684 break;
1685 }
1686 break;
1687 case NES_CM_STATE_MPAREQ_RCVD:
1688 atomic_inc(&cm_node->passive_state);
1689 dev_kfree_skb_any(skb);
1690 break;
1691 case NES_CM_STATE_ESTABLISHED:
1692 case NES_CM_STATE_SYN_RCVD:
1693 case NES_CM_STATE_LISTENING:
1694 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1695 passive_open_err(cm_node, skb, reset);
1696 break;
1697 case NES_CM_STATE_TSA:
1698 active_open_err(cm_node, skb, reset);
1699 break;
1700 case NES_CM_STATE_CLOSED:
1701 drop_packet(skb);
1702 break;
1703 case NES_CM_STATE_FIN_WAIT2:
1704 case NES_CM_STATE_FIN_WAIT1:
1705 case NES_CM_STATE_LAST_ACK:
1706 cm_node->cm_id->rem_ref(cm_node->cm_id);
1707 case NES_CM_STATE_TIME_WAIT:
1708 cm_node->state = NES_CM_STATE_CLOSED;
1709 rem_ref_cm_node(cm_node->cm_core, cm_node);
1710 drop_packet(skb);
1711 break;
1712 default:
1713 drop_packet(skb);
1714 break;
1715 }
1716 }
1717
1718
1719 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1720 {
1721 int ret = 0;
1722 int datasize = skb->len;
1723 u8 *dataloc = skb->data;
1724
1725 enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1726 u32 res_type;
1727
1728 ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1729 if (ret) {
1730 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1731 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1732 nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1733 "cm_node=%p listener=%p state=%d\n", __func__,
1734 __LINE__, cm_node, cm_node->listener,
1735 cm_node->state);
1736 active_open_err(cm_node, skb, 1);
1737 } else {
1738 passive_open_err(cm_node, skb, 1);
1739 }
1740 return;
1741 }
1742
1743 switch (cm_node->state) {
1744 case NES_CM_STATE_ESTABLISHED:
1745 if (res_type == NES_MPA_REQUEST_REJECT)
1746 /*BIG problem as we are receiving the MPA.. So should
1747 * not be REJECT.. This is Passive Open.. We can
1748 * only receive it Reject for Active Open...*/
1749 WARN_ON(1);
1750 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1751 type = NES_CM_EVENT_MPA_REQ;
1752 atomic_set(&cm_node->passive_state,
1753 NES_PASSIVE_STATE_INDICATED);
1754 break;
1755 case NES_CM_STATE_MPAREQ_SENT:
1756 cleanup_retrans_entry(cm_node);
1757 if (res_type == NES_MPA_REQUEST_REJECT) {
1758 type = NES_CM_EVENT_MPA_REJECT;
1759 cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1760 } else {
1761 type = NES_CM_EVENT_CONNECTED;
1762 cm_node->state = NES_CM_STATE_TSA;
1763 }
1764
1765 break;
1766 default:
1767 WARN_ON(1);
1768 break;
1769 }
1770 dev_kfree_skb_any(skb);
1771 create_event(cm_node, type);
1772 }
1773
1774 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1775 {
1776 switch (cm_node->state) {
1777 case NES_CM_STATE_SYN_SENT:
1778 case NES_CM_STATE_MPAREQ_SENT:
1779 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1780 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1781 cm_node->listener, cm_node->state);
1782 active_open_err(cm_node, skb, 1);
1783 break;
1784 case NES_CM_STATE_ESTABLISHED:
1785 case NES_CM_STATE_SYN_RCVD:
1786 passive_open_err(cm_node, skb, 1);
1787 break;
1788 case NES_CM_STATE_TSA:
1789 default:
1790 drop_packet(skb);
1791 }
1792 }
1793
1794 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1795 struct sk_buff *skb)
1796 {
1797 int err;
1798
1799 err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1800 if (err)
1801 active_open_err(cm_node, skb, 1);
1802
1803 return err;
1804 }
1805
1806 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1807 struct sk_buff *skb)
1808 {
1809 int err = 0;
1810 u32 seq;
1811 u32 ack_seq;
1812 u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1813 u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1814 u32 rcv_wnd;
1815
1816 seq = ntohl(tcph->seq);
1817 ack_seq = ntohl(tcph->ack_seq);
1818 rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1819 if (ack_seq != loc_seq_num)
1820 err = 1;
1821 else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1822 err = 1;
1823 if (err) {
1824 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1825 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1826 cm_node->listener, cm_node->state);
1827 indicate_pkt_err(cm_node, skb);
1828 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1829 "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1830 rcv_wnd);
1831 }
1832 return err;
1833 }
1834
1835 /*
1836 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1837 * is created with a listener or it may comein as rexmitted packet which in
1838 * that case will be just dropped.
1839 */
1840 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1841 struct tcphdr *tcph)
1842 {
1843 int ret;
1844 u32 inc_sequence;
1845 int optionsize;
1846
1847 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1848 skb_trim(skb, 0);
1849 inc_sequence = ntohl(tcph->seq);
1850
1851 switch (cm_node->state) {
1852 case NES_CM_STATE_SYN_SENT:
1853 case NES_CM_STATE_MPAREQ_SENT:
1854 /* Rcvd syn on active open connection*/
1855 active_open_err(cm_node, skb, 1);
1856 break;
1857 case NES_CM_STATE_LISTENING:
1858 /* Passive OPEN */
1859 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1860 cm_node->listener->backlog) {
1861 nes_debug(NES_DBG_CM, "drop syn due to backlog "
1862 "pressure \n");
1863 cm_backlog_drops++;
1864 passive_open_err(cm_node, skb, 0);
1865 break;
1866 }
1867 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1868 1);
1869 if (ret) {
1870 passive_open_err(cm_node, skb, 0);
1871 /* drop pkt */
1872 break;
1873 }
1874 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1875 BUG_ON(cm_node->send_entry);
1876 cm_node->accept_pend = 1;
1877 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1878
1879 cm_node->state = NES_CM_STATE_SYN_RCVD;
1880 send_syn(cm_node, 1, skb);
1881 break;
1882 case NES_CM_STATE_CLOSED:
1883 cleanup_retrans_entry(cm_node);
1884 add_ref_cm_node(cm_node);
1885 send_reset(cm_node, skb);
1886 break;
1887 case NES_CM_STATE_TSA:
1888 case NES_CM_STATE_ESTABLISHED:
1889 case NES_CM_STATE_FIN_WAIT1:
1890 case NES_CM_STATE_FIN_WAIT2:
1891 case NES_CM_STATE_MPAREQ_RCVD:
1892 case NES_CM_STATE_LAST_ACK:
1893 case NES_CM_STATE_CLOSING:
1894 case NES_CM_STATE_UNKNOWN:
1895 default:
1896 drop_packet(skb);
1897 break;
1898 }
1899 }
1900
1901 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1902 struct tcphdr *tcph)
1903 {
1904 int ret;
1905 u32 inc_sequence;
1906 int optionsize;
1907
1908 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1909 skb_trim(skb, 0);
1910 inc_sequence = ntohl(tcph->seq);
1911 switch (cm_node->state) {
1912 case NES_CM_STATE_SYN_SENT:
1913 cleanup_retrans_entry(cm_node);
1914 /* active open */
1915 if (check_syn(cm_node, tcph, skb))
1916 return;
1917 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1918 /* setup options */
1919 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1920 if (ret) {
1921 nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1922 cm_node);
1923 break;
1924 }
1925 cleanup_retrans_entry(cm_node);
1926 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1927 send_mpa_request(cm_node, skb);
1928 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1929 break;
1930 case NES_CM_STATE_MPAREQ_RCVD:
1931 /* passive open, so should not be here */
1932 passive_open_err(cm_node, skb, 1);
1933 break;
1934 case NES_CM_STATE_LISTENING:
1935 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1936 cleanup_retrans_entry(cm_node);
1937 cm_node->state = NES_CM_STATE_CLOSED;
1938 send_reset(cm_node, skb);
1939 break;
1940 case NES_CM_STATE_CLOSED:
1941 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1942 cleanup_retrans_entry(cm_node);
1943 add_ref_cm_node(cm_node);
1944 send_reset(cm_node, skb);
1945 break;
1946 case NES_CM_STATE_ESTABLISHED:
1947 case NES_CM_STATE_FIN_WAIT1:
1948 case NES_CM_STATE_FIN_WAIT2:
1949 case NES_CM_STATE_LAST_ACK:
1950 case NES_CM_STATE_TSA:
1951 case NES_CM_STATE_CLOSING:
1952 case NES_CM_STATE_UNKNOWN:
1953 case NES_CM_STATE_MPAREQ_SENT:
1954 default:
1955 drop_packet(skb);
1956 break;
1957 }
1958 }
1959
1960 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1961 struct tcphdr *tcph)
1962 {
1963 int datasize = 0;
1964 u32 inc_sequence;
1965 int ret = 0;
1966 int optionsize;
1967
1968 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1969
1970 if (check_seq(cm_node, tcph, skb))
1971 return -EINVAL;
1972
1973 skb_pull(skb, tcph->doff << 2);
1974 inc_sequence = ntohl(tcph->seq);
1975 datasize = skb->len;
1976 switch (cm_node->state) {
1977 case NES_CM_STATE_SYN_RCVD:
1978 /* Passive OPEN */
1979 cleanup_retrans_entry(cm_node);
1980 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
1981 if (ret)
1982 break;
1983 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1984 cm_node->state = NES_CM_STATE_ESTABLISHED;
1985 if (datasize) {
1986 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1987 handle_rcv_mpa(cm_node, skb);
1988 } else { /* rcvd ACK only */
1989 dev_kfree_skb_any(skb);
1990 }
1991 break;
1992 case NES_CM_STATE_ESTABLISHED:
1993 /* Passive OPEN */
1994 cleanup_retrans_entry(cm_node);
1995 if (datasize) {
1996 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
1997 handle_rcv_mpa(cm_node, skb);
1998 } else {
1999 drop_packet(skb);
2000 }
2001 break;
2002 case NES_CM_STATE_MPAREQ_SENT:
2003 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2004 if (datasize) {
2005 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2006 handle_rcv_mpa(cm_node, skb);
2007 } else { /* Could be just an ack pkt.. */
2008 dev_kfree_skb_any(skb);
2009 }
2010 break;
2011 case NES_CM_STATE_LISTENING:
2012 cleanup_retrans_entry(cm_node);
2013 cm_node->state = NES_CM_STATE_CLOSED;
2014 send_reset(cm_node, skb);
2015 break;
2016 case NES_CM_STATE_CLOSED:
2017 cleanup_retrans_entry(cm_node);
2018 add_ref_cm_node(cm_node);
2019 send_reset(cm_node, skb);
2020 break;
2021 case NES_CM_STATE_LAST_ACK:
2022 case NES_CM_STATE_CLOSING:
2023 cleanup_retrans_entry(cm_node);
2024 cm_node->state = NES_CM_STATE_CLOSED;
2025 cm_node->cm_id->rem_ref(cm_node->cm_id);
2026 rem_ref_cm_node(cm_node->cm_core, cm_node);
2027 drop_packet(skb);
2028 break;
2029 case NES_CM_STATE_FIN_WAIT1:
2030 cleanup_retrans_entry(cm_node);
2031 drop_packet(skb);
2032 cm_node->state = NES_CM_STATE_FIN_WAIT2;
2033 break;
2034 case NES_CM_STATE_SYN_SENT:
2035 case NES_CM_STATE_FIN_WAIT2:
2036 case NES_CM_STATE_TSA:
2037 case NES_CM_STATE_MPAREQ_RCVD:
2038 case NES_CM_STATE_UNKNOWN:
2039 default:
2040 cleanup_retrans_entry(cm_node);
2041 drop_packet(skb);
2042 break;
2043 }
2044 return ret;
2045 }
2046
2047
2048
2049 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2050 struct sk_buff *skb, int optionsize, int passive)
2051 {
2052 u8 *optionsloc = (u8 *)&tcph[1];
2053
2054 if (optionsize) {
2055 if (process_options(cm_node, optionsloc, optionsize,
2056 (u32)tcph->syn)) {
2057 nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2058 __func__, cm_node);
2059 if (passive)
2060 passive_open_err(cm_node, skb, 1);
2061 else
2062 active_open_err(cm_node, skb, 1);
2063 return 1;
2064 }
2065 }
2066
2067 cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2068 cm_node->tcp_cntxt.snd_wscale;
2069
2070 if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2071 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2072 return 0;
2073 }
2074
2075 /*
2076 * active_open_err() will send reset() if flag set..
2077 * It will also send ABORT event.
2078 */
2079 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2080 int reset)
2081 {
2082 cleanup_retrans_entry(cm_node);
2083 if (reset) {
2084 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2085 "state=%d\n", cm_node, cm_node->state);
2086 add_ref_cm_node(cm_node);
2087 send_reset(cm_node, skb);
2088 } else {
2089 dev_kfree_skb_any(skb);
2090 }
2091
2092 cm_node->state = NES_CM_STATE_CLOSED;
2093 create_event(cm_node, NES_CM_EVENT_ABORTED);
2094 }
2095
2096 /*
2097 * passive_open_err() will either do a reset() or will free up the skb and
2098 * remove the cm_node.
2099 */
2100 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2101 int reset)
2102 {
2103 cleanup_retrans_entry(cm_node);
2104 cm_node->state = NES_CM_STATE_CLOSED;
2105 if (reset) {
2106 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2107 "cm_node=%p state =%d\n", cm_node, cm_node->state);
2108 send_reset(cm_node, skb);
2109 } else {
2110 dev_kfree_skb_any(skb);
2111 rem_ref_cm_node(cm_node->cm_core, cm_node);
2112 }
2113 }
2114
2115 /*
2116 * free_retrans_entry() routines assumes that the retrans_list_lock has
2117 * been acquired before calling.
2118 */
2119 static void free_retrans_entry(struct nes_cm_node *cm_node)
2120 {
2121 struct nes_timer_entry *send_entry;
2122
2123 send_entry = cm_node->send_entry;
2124 if (send_entry) {
2125 cm_node->send_entry = NULL;
2126 dev_kfree_skb_any(send_entry->skb);
2127 kfree(send_entry);
2128 rem_ref_cm_node(cm_node->cm_core, cm_node);
2129 }
2130 }
2131
2132 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2133 {
2134 unsigned long flags;
2135
2136 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2137 free_retrans_entry(cm_node);
2138 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2139 }
2140
2141 /**
2142 * process_packet
2143 * Returns skb if to be freed, else it will return NULL if already used..
2144 */
2145 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2146 struct nes_cm_core *cm_core)
2147 {
2148 enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2149 struct tcphdr *tcph = tcp_hdr(skb);
2150 u32 fin_set = 0;
2151 int ret = 0;
2152
2153 skb_pull(skb, ip_hdr(skb)->ihl << 2);
2154
2155 nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2156 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2157 tcph->ack, tcph->rst, tcph->fin);
2158
2159 if (tcph->rst) {
2160 pkt_type = NES_PKT_TYPE_RST;
2161 } else if (tcph->syn) {
2162 pkt_type = NES_PKT_TYPE_SYN;
2163 if (tcph->ack)
2164 pkt_type = NES_PKT_TYPE_SYNACK;
2165 } else if (tcph->ack) {
2166 pkt_type = NES_PKT_TYPE_ACK;
2167 }
2168 if (tcph->fin)
2169 fin_set = 1;
2170
2171 switch (pkt_type) {
2172 case NES_PKT_TYPE_SYN:
2173 handle_syn_pkt(cm_node, skb, tcph);
2174 break;
2175 case NES_PKT_TYPE_SYNACK:
2176 handle_synack_pkt(cm_node, skb, tcph);
2177 break;
2178 case NES_PKT_TYPE_ACK:
2179 ret = handle_ack_pkt(cm_node, skb, tcph);
2180 if (fin_set && !ret)
2181 handle_fin_pkt(cm_node);
2182 break;
2183 case NES_PKT_TYPE_RST:
2184 handle_rst_pkt(cm_node, skb, tcph);
2185 break;
2186 default:
2187 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2188 handle_fin_pkt(cm_node);
2189 drop_packet(skb);
2190 break;
2191 }
2192 }
2193
2194 /**
2195 * mini_cm_listen - create a listen node with params
2196 */
2197 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2198 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2199 {
2200 struct nes_cm_listener *listener;
2201 unsigned long flags;
2202
2203 nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2204 cm_info->loc_addr, cm_info->loc_port);
2205
2206 /* cannot have multiple matching listeners */
2207 listener = find_listener(cm_core, htonl(cm_info->loc_addr),
2208 htons(cm_info->loc_port), NES_CM_LISTENER_EITHER_STATE);
2209 if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2210 /* find automatically incs ref count ??? */
2211 atomic_dec(&listener->ref_count);
2212 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2213 return NULL;
2214 }
2215
2216 if (!listener) {
2217 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2218 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2219 if (!listener) {
2220 nes_debug(NES_DBG_CM, "Not creating listener memory allocation failed\n");
2221 return NULL;
2222 }
2223
2224 listener->loc_addr = htonl(cm_info->loc_addr);
2225 listener->loc_port = htons(cm_info->loc_port);
2226 listener->reused_node = 0;
2227
2228 atomic_set(&listener->ref_count, 1);
2229 }
2230 /* pasive case */
2231 /* find already inc'ed the ref count */
2232 else {
2233 listener->reused_node = 1;
2234 }
2235
2236 listener->cm_id = cm_info->cm_id;
2237 atomic_set(&listener->pend_accepts_cnt, 0);
2238 listener->cm_core = cm_core;
2239 listener->nesvnic = nesvnic;
2240 atomic_inc(&cm_core->node_cnt);
2241
2242 listener->conn_type = cm_info->conn_type;
2243 listener->backlog = cm_info->backlog;
2244 listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2245
2246 if (!listener->reused_node) {
2247 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2248 list_add(&listener->list, &cm_core->listen_list.list);
2249 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2250 atomic_inc(&cm_core->listen_node_cnt);
2251 }
2252
2253 nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2254 " listener = %p, backlog = %d, cm_id = %p.\n",
2255 cm_info->loc_addr, cm_info->loc_port,
2256 listener, listener->backlog, listener->cm_id);
2257
2258 return listener;
2259 }
2260
2261
2262 /**
2263 * mini_cm_connect - make a connection node with params
2264 */
2265 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2266 struct nes_vnic *nesvnic, u16 private_data_len,
2267 void *private_data, struct nes_cm_info *cm_info)
2268 {
2269 int ret = 0;
2270 struct nes_cm_node *cm_node;
2271 struct nes_cm_listener *loopbackremotelistener;
2272 struct nes_cm_node *loopbackremotenode;
2273 struct nes_cm_info loopback_cm_info;
2274 u8 *start_buff;
2275
2276 /* create a CM connection node */
2277 cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2278 if (!cm_node)
2279 return NULL;
2280
2281 /* set our node side to client (active) side */
2282 cm_node->tcp_cntxt.client = 1;
2283 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2284
2285 if (cm_info->loc_addr == cm_info->rem_addr) {
2286 loopbackremotelistener = find_listener(cm_core,
2287 ntohl(nesvnic->local_ipaddr), cm_node->rem_port,
2288 NES_CM_LISTENER_ACTIVE_STATE);
2289 if (loopbackremotelistener == NULL) {
2290 create_event(cm_node, NES_CM_EVENT_ABORTED);
2291 } else {
2292 loopback_cm_info = *cm_info;
2293 loopback_cm_info.loc_port = cm_info->rem_port;
2294 loopback_cm_info.rem_port = cm_info->loc_port;
2295 loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2296 loopbackremotenode = make_cm_node(cm_core, nesvnic,
2297 &loopback_cm_info, loopbackremotelistener);
2298 if (!loopbackremotenode) {
2299 rem_ref_cm_node(cm_node->cm_core, cm_node);
2300 return NULL;
2301 }
2302 atomic_inc(&cm_loopbacks);
2303 loopbackremotenode->loopbackpartner = cm_node;
2304 loopbackremotenode->tcp_cntxt.rcv_wscale =
2305 NES_CM_DEFAULT_RCV_WND_SCALE;
2306 cm_node->loopbackpartner = loopbackremotenode;
2307 memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2308 private_data_len);
2309 loopbackremotenode->mpa_frame_size = private_data_len;
2310
2311 /* we are done handling this state. */
2312 /* set node to a TSA state */
2313 cm_node->state = NES_CM_STATE_TSA;
2314 cm_node->tcp_cntxt.rcv_nxt =
2315 loopbackremotenode->tcp_cntxt.loc_seq_num;
2316 loopbackremotenode->tcp_cntxt.rcv_nxt =
2317 cm_node->tcp_cntxt.loc_seq_num;
2318 cm_node->tcp_cntxt.max_snd_wnd =
2319 loopbackremotenode->tcp_cntxt.rcv_wnd;
2320 loopbackremotenode->tcp_cntxt.max_snd_wnd =
2321 cm_node->tcp_cntxt.rcv_wnd;
2322 cm_node->tcp_cntxt.snd_wnd =
2323 loopbackremotenode->tcp_cntxt.rcv_wnd;
2324 loopbackremotenode->tcp_cntxt.snd_wnd =
2325 cm_node->tcp_cntxt.rcv_wnd;
2326 cm_node->tcp_cntxt.snd_wscale =
2327 loopbackremotenode->tcp_cntxt.rcv_wscale;
2328 loopbackremotenode->tcp_cntxt.snd_wscale =
2329 cm_node->tcp_cntxt.rcv_wscale;
2330 loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2331 create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2332 }
2333 return cm_node;
2334 }
2335
2336 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2337 cm_node->mpa_frame_size = private_data_len;
2338
2339 memcpy(start_buff, private_data, private_data_len);
2340
2341 /* send a syn and goto syn sent state */
2342 cm_node->state = NES_CM_STATE_SYN_SENT;
2343 ret = send_syn(cm_node, 0, NULL);
2344
2345 if (ret) {
2346 /* error in sending the syn free up the cm_node struct */
2347 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2348 "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2349 cm_node->rem_addr, cm_node->rem_port, cm_node,
2350 cm_node->cm_id);
2351 rem_ref_cm_node(cm_node->cm_core, cm_node);
2352 cm_node = NULL;
2353 }
2354
2355 if (cm_node) {
2356 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2357 "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2358 cm_node->rem_addr, cm_node->rem_port, cm_node,
2359 cm_node->cm_id);
2360 }
2361
2362 return cm_node;
2363 }
2364
2365
2366 /**
2367 * mini_cm_accept - accept a connection
2368 * This function is never called
2369 */
2370 static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2371 {
2372 return 0;
2373 }
2374
2375
2376 /**
2377 * mini_cm_reject - reject and teardown a connection
2378 */
2379 static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2380 {
2381 int ret = 0;
2382 int err = 0;
2383 int passive_state;
2384 struct nes_cm_event event;
2385 struct iw_cm_id *cm_id = cm_node->cm_id;
2386 struct nes_cm_node *loopback = cm_node->loopbackpartner;
2387
2388 nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2389 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2390
2391 if (cm_node->tcp_cntxt.client)
2392 return ret;
2393 cleanup_retrans_entry(cm_node);
2394
2395 if (!loopback) {
2396 passive_state = atomic_add_return(1, &cm_node->passive_state);
2397 if (passive_state == NES_SEND_RESET_EVENT) {
2398 cm_node->state = NES_CM_STATE_CLOSED;
2399 rem_ref_cm_node(cm_core, cm_node);
2400 } else {
2401 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2402 rem_ref_cm_node(cm_core, cm_node);
2403 } else {
2404 ret = send_mpa_reject(cm_node);
2405 if (ret) {
2406 cm_node->state = NES_CM_STATE_CLOSED;
2407 err = send_reset(cm_node, NULL);
2408 if (err)
2409 WARN_ON(1);
2410 } else {
2411 cm_id->add_ref(cm_id);
2412 }
2413 }
2414 }
2415 } else {
2416 cm_node->cm_id = NULL;
2417 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2418 rem_ref_cm_node(cm_core, cm_node);
2419 rem_ref_cm_node(cm_core, loopback);
2420 } else {
2421 event.cm_node = loopback;
2422 event.cm_info.rem_addr = loopback->rem_addr;
2423 event.cm_info.loc_addr = loopback->loc_addr;
2424 event.cm_info.rem_port = loopback->rem_port;
2425 event.cm_info.loc_port = loopback->loc_port;
2426 event.cm_info.cm_id = loopback->cm_id;
2427 cm_event_mpa_reject(&event);
2428 rem_ref_cm_node(cm_core, cm_node);
2429 loopback->state = NES_CM_STATE_CLOSING;
2430
2431 cm_id = loopback->cm_id;
2432 rem_ref_cm_node(cm_core, loopback);
2433 cm_id->rem_ref(cm_id);
2434 }
2435 }
2436
2437 return ret;
2438 }
2439
2440
2441 /**
2442 * mini_cm_close
2443 */
2444 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2445 {
2446 int ret = 0;
2447
2448 if (!cm_core || !cm_node)
2449 return -EINVAL;
2450
2451 switch (cm_node->state) {
2452 case NES_CM_STATE_SYN_RCVD:
2453 case NES_CM_STATE_SYN_SENT:
2454 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2455 case NES_CM_STATE_ESTABLISHED:
2456 case NES_CM_STATE_ACCEPTING:
2457 case NES_CM_STATE_MPAREQ_SENT:
2458 case NES_CM_STATE_MPAREQ_RCVD:
2459 cleanup_retrans_entry(cm_node);
2460 send_reset(cm_node, NULL);
2461 break;
2462 case NES_CM_STATE_CLOSE_WAIT:
2463 cm_node->state = NES_CM_STATE_LAST_ACK;
2464 send_fin(cm_node, NULL);
2465 break;
2466 case NES_CM_STATE_FIN_WAIT1:
2467 case NES_CM_STATE_FIN_WAIT2:
2468 case NES_CM_STATE_LAST_ACK:
2469 case NES_CM_STATE_TIME_WAIT:
2470 case NES_CM_STATE_CLOSING:
2471 ret = -1;
2472 break;
2473 case NES_CM_STATE_LISTENING:
2474 cleanup_retrans_entry(cm_node);
2475 send_reset(cm_node, NULL);
2476 break;
2477 case NES_CM_STATE_MPAREJ_RCVD:
2478 case NES_CM_STATE_UNKNOWN:
2479 case NES_CM_STATE_INITED:
2480 case NES_CM_STATE_CLOSED:
2481 case NES_CM_STATE_LISTENER_DESTROYED:
2482 ret = rem_ref_cm_node(cm_core, cm_node);
2483 break;
2484 case NES_CM_STATE_TSA:
2485 if (cm_node->send_entry)
2486 printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2487 "send_entry=%p\n", cm_node->send_entry);
2488 ret = rem_ref_cm_node(cm_core, cm_node);
2489 break;
2490 }
2491 return ret;
2492 }
2493
2494
2495 /**
2496 * recv_pkt - recv an ETHERNET packet, and process it through CM
2497 * node state machine
2498 */
2499 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2500 struct nes_vnic *nesvnic, struct sk_buff *skb)
2501 {
2502 struct nes_cm_node *cm_node = NULL;
2503 struct nes_cm_listener *listener = NULL;
2504 struct iphdr *iph;
2505 struct tcphdr *tcph;
2506 struct nes_cm_info nfo;
2507 int skb_handled = 1;
2508 __be32 tmp_daddr, tmp_saddr;
2509
2510 if (!skb)
2511 return 0;
2512 if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2513 return 0;
2514
2515 iph = (struct iphdr *)skb->data;
2516 tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2517
2518 nfo.loc_addr = ntohl(iph->daddr);
2519 nfo.loc_port = ntohs(tcph->dest);
2520 nfo.rem_addr = ntohl(iph->saddr);
2521 nfo.rem_port = ntohs(tcph->source);
2522
2523 tmp_daddr = cpu_to_be32(iph->daddr);
2524 tmp_saddr = cpu_to_be32(iph->saddr);
2525
2526 nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2527 &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2528
2529 do {
2530 cm_node = find_node(cm_core,
2531 nfo.rem_port, nfo.rem_addr,
2532 nfo.loc_port, nfo.loc_addr);
2533
2534 if (!cm_node) {
2535 /* Only type of packet accepted are for */
2536 /* the PASSIVE open (syn only) */
2537 if ((!tcph->syn) || (tcph->ack)) {
2538 skb_handled = 0;
2539 break;
2540 }
2541 listener = find_listener(cm_core, nfo.loc_addr,
2542 nfo.loc_port,
2543 NES_CM_LISTENER_ACTIVE_STATE);
2544 if (!listener) {
2545 nfo.cm_id = NULL;
2546 nfo.conn_type = 0;
2547 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2548 skb_handled = 0;
2549 break;
2550 }
2551 nfo.cm_id = listener->cm_id;
2552 nfo.conn_type = listener->conn_type;
2553 cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2554 listener);
2555 if (!cm_node) {
2556 nes_debug(NES_DBG_CM, "Unable to allocate "
2557 "node\n");
2558 cm_packets_dropped++;
2559 atomic_dec(&listener->ref_count);
2560 dev_kfree_skb_any(skb);
2561 break;
2562 }
2563 if (!tcph->rst && !tcph->fin) {
2564 cm_node->state = NES_CM_STATE_LISTENING;
2565 } else {
2566 cm_packets_dropped++;
2567 rem_ref_cm_node(cm_core, cm_node);
2568 dev_kfree_skb_any(skb);
2569 break;
2570 }
2571 add_ref_cm_node(cm_node);
2572 } else if (cm_node->state == NES_CM_STATE_TSA) {
2573 if (cm_node->nesqp->pau_mode)
2574 nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2575 else {
2576 rem_ref_cm_node(cm_core, cm_node);
2577 atomic_inc(&cm_accel_dropped_pkts);
2578 dev_kfree_skb_any(skb);
2579 }
2580 break;
2581 }
2582 skb_reset_network_header(skb);
2583 skb_set_transport_header(skb, sizeof(*tcph));
2584 skb->len = ntohs(iph->tot_len);
2585 process_packet(cm_node, skb, cm_core);
2586 rem_ref_cm_node(cm_core, cm_node);
2587 } while (0);
2588 return skb_handled;
2589 }
2590
2591
2592 /**
2593 * nes_cm_alloc_core - allocate a top level instance of a cm core
2594 */
2595 static struct nes_cm_core *nes_cm_alloc_core(void)
2596 {
2597 struct nes_cm_core *cm_core;
2598
2599 /* setup the CM core */
2600 /* alloc top level core control structure */
2601 cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2602 if (!cm_core)
2603 return NULL;
2604
2605 INIT_LIST_HEAD(&cm_core->connected_nodes);
2606 init_timer(&cm_core->tcp_timer);
2607 cm_core->tcp_timer.function = nes_cm_timer_tick;
2608
2609 cm_core->mtu = NES_CM_DEFAULT_MTU;
2610 cm_core->state = NES_CM_STATE_INITED;
2611 cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2612
2613 atomic_set(&cm_core->events_posted, 0);
2614
2615 cm_core->api = &nes_cm_api;
2616
2617 spin_lock_init(&cm_core->ht_lock);
2618 spin_lock_init(&cm_core->listen_list_lock);
2619
2620 INIT_LIST_HEAD(&cm_core->listen_list.list);
2621
2622 nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2623
2624 nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2625 cm_core->event_wq = create_singlethread_workqueue("nesewq");
2626 cm_core->post_event = nes_cm_post_event;
2627 nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2628 cm_core->disconn_wq = create_singlethread_workqueue("nesdwq");
2629
2630 print_core(cm_core);
2631 return cm_core;
2632 }
2633
2634
2635 /**
2636 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2637 */
2638 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2639 {
2640 nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2641
2642 if (!cm_core)
2643 return -EINVAL;
2644
2645 barrier();
2646
2647 if (timer_pending(&cm_core->tcp_timer))
2648 del_timer(&cm_core->tcp_timer);
2649
2650 destroy_workqueue(cm_core->event_wq);
2651 destroy_workqueue(cm_core->disconn_wq);
2652 nes_debug(NES_DBG_CM, "\n");
2653 kfree(cm_core);
2654
2655 return 0;
2656 }
2657
2658
2659 /**
2660 * mini_cm_get
2661 */
2662 static int mini_cm_get(struct nes_cm_core *cm_core)
2663 {
2664 return cm_core->state;
2665 }
2666
2667
2668 /**
2669 * mini_cm_set
2670 */
2671 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2672 {
2673 int ret = 0;
2674
2675 switch (type) {
2676 case NES_CM_SET_PKT_SIZE:
2677 cm_core->mtu = value;
2678 break;
2679 case NES_CM_SET_FREE_PKT_Q_SIZE:
2680 cm_core->free_tx_pkt_max = value;
2681 break;
2682 default:
2683 /* unknown set option */
2684 ret = -EINVAL;
2685 }
2686
2687 return ret;
2688 }
2689
2690
2691 /**
2692 * nes_cm_init_tsa_conn setup HW; MPA frames must be
2693 * successfully exchanged when this is called
2694 */
2695 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2696 {
2697 int ret = 0;
2698
2699 if (!nesqp)
2700 return -EINVAL;
2701
2702 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2703 NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2704 NES_QPCONTEXT_MISC_DROS);
2705
2706 if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2707 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2708
2709 nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2710
2711 nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2712
2713 nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2714 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2715
2716 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2717 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2718 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2719
2720 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2721 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2722 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2723
2724 nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2725 nesqp->nesqp_context->ts_recent = 0;
2726 nesqp->nesqp_context->ts_age = 0;
2727 nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2728 nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2729 nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2730 nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2731 cm_node->tcp_cntxt.rcv_wscale);
2732 nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2733 nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2734 nesqp->nesqp_context->srtt = 0;
2735 nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2736 nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2737 nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2738 nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2739 nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2740 nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2741
2742 nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2743 " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2744 nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2745 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2746 cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2747 le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2748 le32_to_cpu(nesqp->nesqp_context->misc));
2749 nes_debug(NES_DBG_CM, " snd_wnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2750 nes_debug(NES_DBG_CM, " snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2751 nes_debug(NES_DBG_CM, " max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2752
2753 nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2754 cm_node->state = NES_CM_STATE_TSA;
2755
2756 return ret;
2757 }
2758
2759
2760 /**
2761 * nes_cm_disconn
2762 */
2763 int nes_cm_disconn(struct nes_qp *nesqp)
2764 {
2765 struct disconn_work *work;
2766
2767 work = kzalloc(sizeof *work, GFP_ATOMIC);
2768 if (!work)
2769 return -ENOMEM; /* Timer will clean up */
2770
2771 nes_add_ref(&nesqp->ibqp);
2772 work->nesqp = nesqp;
2773 INIT_WORK(&work->work, nes_disconnect_worker);
2774 queue_work(g_cm_core->disconn_wq, &work->work);
2775 return 0;
2776 }
2777
2778
2779 /**
2780 * nes_disconnect_worker
2781 */
2782 static void nes_disconnect_worker(struct work_struct *work)
2783 {
2784 struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2785 struct nes_qp *nesqp = dwork->nesqp;
2786
2787 kfree(dwork);
2788 nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2789 nesqp->last_aeq, nesqp->hwqp.qp_id);
2790 nes_cm_disconn_true(nesqp);
2791 nes_rem_ref(&nesqp->ibqp);
2792 }
2793
2794
2795 /**
2796 * nes_cm_disconn_true
2797 */
2798 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2799 {
2800 unsigned long flags;
2801 int ret = 0;
2802 struct iw_cm_id *cm_id;
2803 struct iw_cm_event cm_event;
2804 struct nes_vnic *nesvnic;
2805 u16 last_ae;
2806 u8 original_hw_tcp_state;
2807 u8 original_ibqp_state;
2808 int disconn_status = 0;
2809 int issue_disconn = 0;
2810 int issue_close = 0;
2811 int issue_flush = 0;
2812 u32 flush_q = NES_CQP_FLUSH_RQ;
2813 struct ib_event ibevent;
2814
2815 if (!nesqp) {
2816 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2817 return -1;
2818 }
2819
2820 spin_lock_irqsave(&nesqp->lock, flags);
2821 cm_id = nesqp->cm_id;
2822 /* make sure we havent already closed this connection */
2823 if (!cm_id) {
2824 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2825 nesqp->hwqp.qp_id);
2826 spin_unlock_irqrestore(&nesqp->lock, flags);
2827 return -1;
2828 }
2829
2830 nesvnic = to_nesvnic(nesqp->ibqp.device);
2831 nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2832
2833 original_hw_tcp_state = nesqp->hw_tcp_state;
2834 original_ibqp_state = nesqp->ibqp_state;
2835 last_ae = nesqp->last_aeq;
2836
2837 if (nesqp->term_flags) {
2838 issue_disconn = 1;
2839 issue_close = 1;
2840 nesqp->cm_id = NULL;
2841 if (nesqp->flush_issued == 0) {
2842 nesqp->flush_issued = 1;
2843 issue_flush = 1;
2844 }
2845 } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2846 ((original_ibqp_state == IB_QPS_RTS) &&
2847 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2848 issue_disconn = 1;
2849 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2850 disconn_status = -ECONNRESET;
2851 }
2852
2853 if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2854 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2855 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2856 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2857 issue_close = 1;
2858 nesqp->cm_id = NULL;
2859 if (nesqp->flush_issued == 0) {
2860 nesqp->flush_issued = 1;
2861 issue_flush = 1;
2862 }
2863 }
2864
2865 spin_unlock_irqrestore(&nesqp->lock, flags);
2866
2867 if ((issue_flush) && (nesqp->destroyed == 0)) {
2868 /* Flush the queue(s) */
2869 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2870 flush_q |= NES_CQP_FLUSH_SQ;
2871 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2872
2873 if (nesqp->term_flags) {
2874 ibevent.device = nesqp->ibqp.device;
2875 ibevent.event = nesqp->terminate_eventtype;
2876 ibevent.element.qp = &nesqp->ibqp;
2877 nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2878 }
2879 }
2880
2881 if ((cm_id) && (cm_id->event_handler)) {
2882 if (issue_disconn) {
2883 atomic_inc(&cm_disconnects);
2884 cm_event.event = IW_CM_EVENT_DISCONNECT;
2885 cm_event.status = disconn_status;
2886 cm_event.local_addr = cm_id->local_addr;
2887 cm_event.remote_addr = cm_id->remote_addr;
2888 cm_event.private_data = NULL;
2889 cm_event.private_data_len = 0;
2890
2891 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2892 " for QP%u, SQ Head = %u, SQ Tail = %u. "
2893 "cm_id = %p, refcount = %u.\n",
2894 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2895 nesqp->hwqp.sq_tail, cm_id,
2896 atomic_read(&nesqp->refcount));
2897
2898 ret = cm_id->event_handler(cm_id, &cm_event);
2899 if (ret)
2900 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2901 "returned, ret=%d\n", ret);
2902 }
2903
2904 if (issue_close) {
2905 atomic_inc(&cm_closes);
2906 nes_disconnect(nesqp, 1);
2907
2908 cm_id->provider_data = nesqp;
2909 /* Send up the close complete event */
2910 cm_event.event = IW_CM_EVENT_CLOSE;
2911 cm_event.status = 0;
2912 cm_event.provider_data = cm_id->provider_data;
2913 cm_event.local_addr = cm_id->local_addr;
2914 cm_event.remote_addr = cm_id->remote_addr;
2915 cm_event.private_data = NULL;
2916 cm_event.private_data_len = 0;
2917
2918 ret = cm_id->event_handler(cm_id, &cm_event);
2919 if (ret)
2920 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2921
2922 cm_id->rem_ref(cm_id);
2923 }
2924 }
2925
2926 return 0;
2927 }
2928
2929
2930 /**
2931 * nes_disconnect
2932 */
2933 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2934 {
2935 int ret = 0;
2936 struct nes_vnic *nesvnic;
2937 struct nes_device *nesdev;
2938 struct nes_ib_device *nesibdev;
2939
2940 nesvnic = to_nesvnic(nesqp->ibqp.device);
2941 if (!nesvnic)
2942 return -EINVAL;
2943
2944 nesdev = nesvnic->nesdev;
2945 nesibdev = nesvnic->nesibdev;
2946
2947 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2948 netdev_refcnt_read(nesvnic->netdev));
2949
2950 if (nesqp->active_conn) {
2951
2952 /* indicate this connection is NOT active */
2953 nesqp->active_conn = 0;
2954 } else {
2955 /* Need to free the Last Streaming Mode Message */
2956 if (nesqp->ietf_frame) {
2957 if (nesqp->lsmm_mr)
2958 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2959 pci_free_consistent(nesdev->pcidev,
2960 nesqp->private_data_len + nesqp->ietf_frame_size,
2961 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2962 }
2963 }
2964
2965 /* close the CM node down if it is still active */
2966 if (nesqp->cm_node) {
2967 nes_debug(NES_DBG_CM, "Call close API\n");
2968
2969 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2970 }
2971
2972 return ret;
2973 }
2974
2975
2976 /**
2977 * nes_accept
2978 */
2979 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2980 {
2981 u64 u64temp;
2982 struct ib_qp *ibqp;
2983 struct nes_qp *nesqp;
2984 struct nes_vnic *nesvnic;
2985 struct nes_device *nesdev;
2986 struct nes_cm_node *cm_node;
2987 struct nes_adapter *adapter;
2988 struct ib_qp_attr attr;
2989 struct iw_cm_event cm_event;
2990 struct nes_hw_qp_wqe *wqe;
2991 struct nes_v4_quad nes_quad;
2992 u32 crc_value;
2993 int ret;
2994 int passive_state;
2995 struct nes_ib_device *nesibdev;
2996 struct ib_mr *ibmr = NULL;
2997 struct ib_phys_buf ibphysbuf;
2998 struct nes_pd *nespd;
2999 u64 tagged_offset;
3000 u8 mpa_frame_offset = 0;
3001 struct ietf_mpa_v2 *mpa_v2_frame;
3002 u8 start_addr = 0;
3003 u8 *start_ptr = &start_addr;
3004 u8 **start_buff = &start_ptr;
3005 u16 buff_len = 0;
3006
3007 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3008 if (!ibqp)
3009 return -EINVAL;
3010
3011 /* get all our handles */
3012 nesqp = to_nesqp(ibqp);
3013 nesvnic = to_nesvnic(nesqp->ibqp.device);
3014 nesdev = nesvnic->nesdev;
3015 adapter = nesdev->nesadapter;
3016
3017 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3018 nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3019 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3020 nesvnic->netdev->name);
3021
3022 if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3023 if (cm_node->loopbackpartner)
3024 rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3025 rem_ref_cm_node(cm_node->cm_core, cm_node);
3026 return -EINVAL;
3027 }
3028
3029 passive_state = atomic_add_return(1, &cm_node->passive_state);
3030 if (passive_state == NES_SEND_RESET_EVENT) {
3031 rem_ref_cm_node(cm_node->cm_core, cm_node);
3032 return -ECONNRESET;
3033 }
3034
3035 /* associate the node with the QP */
3036 nesqp->cm_node = (void *)cm_node;
3037 cm_node->nesqp = nesqp;
3038
3039 nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3040 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3041 atomic_inc(&cm_accepts);
3042
3043 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3044 netdev_refcnt_read(nesvnic->netdev));
3045
3046 nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3047 /* allocate the ietf frame and space for private data */
3048 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3049 nesqp->ietf_frame_size + conn_param->private_data_len,
3050 &nesqp->ietf_frame_pbase);
3051
3052 if (!nesqp->ietf_frame) {
3053 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3054 return -ENOMEM;
3055 }
3056 mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3057
3058 if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3059 mpa_frame_offset = 4;
3060
3061 memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3062 conn_param->private_data_len);
3063
3064 cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3065 nesqp->private_data_len = conn_param->private_data_len;
3066
3067 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3068 wqe = &nesqp->hwqp.sq_vbase[0];
3069
3070 if (cm_id->remote_addr.sin_addr.s_addr !=
3071 cm_id->local_addr.sin_addr.s_addr) {
3072 u64temp = (unsigned long)nesqp;
3073 nesibdev = nesvnic->nesibdev;
3074 nespd = nesqp->nespd;
3075 ibphysbuf.addr = nesqp->ietf_frame_pbase + mpa_frame_offset;
3076 ibphysbuf.size = buff_len;
3077 tagged_offset = (u64)(unsigned long)*start_buff;
3078 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
3079 &ibphysbuf, 1,
3080 IB_ACCESS_LOCAL_WRITE,
3081 &tagged_offset);
3082 if (!ibmr) {
3083 nes_debug(NES_DBG_CM, "Unable to register memory region"
3084 "for lSMM for cm_node = %p \n",
3085 cm_node);
3086 pci_free_consistent(nesdev->pcidev,
3087 nesqp->private_data_len + nesqp->ietf_frame_size,
3088 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3089 return -ENOMEM;
3090 }
3091
3092 ibmr->pd = &nespd->ibpd;
3093 ibmr->device = nespd->ibpd.device;
3094 nesqp->lsmm_mr = ibmr;
3095
3096 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3097 set_wqe_64bit_value(wqe->wqe_words,
3098 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3099 u64temp);
3100 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3101 cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3102 NES_IWARP_SQ_WQE_WRPDU);
3103 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3104 cpu_to_le32(buff_len);
3105 set_wqe_64bit_value(wqe->wqe_words,
3106 NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3107 (u64)(unsigned long)(*start_buff));
3108 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3109 cpu_to_le32(buff_len);
3110 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3111 if (nesqp->sq_kmapped) {
3112 nesqp->sq_kmapped = 0;
3113 kunmap(nesqp->page);
3114 }
3115
3116 nesqp->nesqp_context->ird_ord_sizes |=
3117 cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3118 NES_QPCONTEXT_ORDIRD_WRPDU);
3119 } else {
3120 nesqp->nesqp_context->ird_ord_sizes |=
3121 cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3122 }
3123 nesqp->skip_lsmm = 1;
3124
3125
3126 /* Cache the cm_id in the qp */
3127 nesqp->cm_id = cm_id;
3128 cm_node->cm_id = cm_id;
3129
3130 /* nesqp->cm_node = (void *)cm_id->provider_data; */
3131 cm_id->provider_data = nesqp;
3132 nesqp->active_conn = 0;
3133
3134 if (cm_node->state == NES_CM_STATE_TSA)
3135 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3136 cm_node);
3137
3138 nes_cm_init_tsa_conn(nesqp, cm_node);
3139
3140 nesqp->nesqp_context->tcpPorts[0] =
3141 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3142 nesqp->nesqp_context->tcpPorts[1] =
3143 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3144
3145 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3146 nesqp->nesqp_context->ip0 =
3147 cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3148 else
3149 nesqp->nesqp_context->ip0 =
3150 cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3151
3152 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3153 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3154 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3155
3156 nesqp->nesqp_context->arp_index_vlan |=
3157 cpu_to_le32(nes_arp_table(nesdev,
3158 le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3159 NES_ARP_RESOLVE) << 16);
3160
3161 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3162 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3163
3164 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3165
3166 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3167 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3168 nesqp->nesqp_context->ird_ord_sizes |=
3169 cpu_to_le32((u32)conn_param->ord);
3170
3171 memset(&nes_quad, 0, sizeof(nes_quad));
3172 nes_quad.DstIpAdrIndex =
3173 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3174 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3175 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3176 else
3177 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3178 nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3179 nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3180
3181 /* Produce hash key */
3182 crc_value = get_crc_value(&nes_quad);
3183 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3184 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3185 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3186
3187 nesqp->hte_index &= adapter->hte_index_mask;
3188 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3189
3190 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3191
3192 nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3193 "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3194 "private data length=%u.\n", nesqp->hwqp.qp_id,
3195 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3196 ntohs(cm_id->remote_addr.sin_port),
3197 ntohl(cm_id->local_addr.sin_addr.s_addr),
3198 ntohs(cm_id->local_addr.sin_port),
3199 le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3200 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3201 buff_len);
3202
3203 /* notify OF layer that accept event was successful */
3204 cm_id->add_ref(cm_id);
3205 nes_add_ref(&nesqp->ibqp);
3206
3207 cm_event.event = IW_CM_EVENT_ESTABLISHED;
3208 cm_event.status = 0;
3209 cm_event.provider_data = (void *)nesqp;
3210 cm_event.local_addr = cm_id->local_addr;
3211 cm_event.remote_addr = cm_id->remote_addr;
3212 cm_event.private_data = NULL;
3213 cm_event.private_data_len = 0;
3214 ret = cm_id->event_handler(cm_id, &cm_event);
3215 attr.qp_state = IB_QPS_RTS;
3216 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3217 if (cm_node->loopbackpartner) {
3218 cm_node->loopbackpartner->mpa_frame_size =
3219 nesqp->private_data_len;
3220 /* copy entire MPA frame to our cm_node's frame */
3221 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3222 conn_param->private_data, conn_param->private_data_len);
3223 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3224 }
3225 if (ret)
3226 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3227 "ret=%d\n", __func__, __LINE__, ret);
3228
3229 return 0;
3230 }
3231
3232
3233 /**
3234 * nes_reject
3235 */
3236 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3237 {
3238 struct nes_cm_node *cm_node;
3239 struct nes_cm_node *loopback;
3240 struct nes_cm_core *cm_core;
3241 u8 *start_buff;
3242
3243 atomic_inc(&cm_rejects);
3244 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3245 loopback = cm_node->loopbackpartner;
3246 cm_core = cm_node->cm_core;
3247 cm_node->cm_id = cm_id;
3248
3249 if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3250 return -EINVAL;
3251
3252 if (loopback) {
3253 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3254 loopback->mpa_frame.priv_data_len = pdata_len;
3255 loopback->mpa_frame_size = pdata_len;
3256 } else {
3257 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3258 cm_node->mpa_frame_size = pdata_len;
3259 memcpy(start_buff, pdata, pdata_len);
3260 }
3261 return cm_core->api->reject(cm_core, cm_node);
3262 }
3263
3264
3265 /**
3266 * nes_connect
3267 * setup and launch cm connect node
3268 */
3269 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3270 {
3271 struct ib_qp *ibqp;
3272 struct nes_qp *nesqp;
3273 struct nes_vnic *nesvnic;
3274 struct nes_device *nesdev;
3275 struct nes_cm_node *cm_node;
3276 struct nes_cm_info cm_info;
3277 int apbvt_set = 0;
3278
3279 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3280 if (!ibqp)
3281 return -EINVAL;
3282 nesqp = to_nesqp(ibqp);
3283 if (!nesqp)
3284 return -EINVAL;
3285 nesvnic = to_nesvnic(nesqp->ibqp.device);
3286 if (!nesvnic)
3287 return -EINVAL;
3288 nesdev = nesvnic->nesdev;
3289 if (!nesdev)
3290 return -EINVAL;
3291
3292 if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3293 return -EINVAL;
3294
3295 nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3296 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3297 ntohl(nesvnic->local_ipaddr),
3298 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3299 ntohs(cm_id->remote_addr.sin_port),
3300 ntohl(cm_id->local_addr.sin_addr.s_addr),
3301 ntohs(cm_id->local_addr.sin_port));
3302
3303 atomic_inc(&cm_connects);
3304 nesqp->active_conn = 1;
3305
3306 /* cache the cm_id in the qp */
3307 nesqp->cm_id = cm_id;
3308
3309 cm_id->provider_data = nesqp;
3310
3311 nesqp->private_data_len = conn_param->private_data_len;
3312 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3313 nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3314 nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3315 conn_param->private_data_len);
3316
3317 if (cm_id->local_addr.sin_addr.s_addr !=
3318 cm_id->remote_addr.sin_addr.s_addr) {
3319 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3320 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3321 apbvt_set = 1;
3322 }
3323
3324 /* set up the connection params for the node */
3325 cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3326 cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3327 cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3328 cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3329 cm_info.cm_id = cm_id;
3330 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3331
3332 cm_id->add_ref(cm_id);
3333
3334 /* create a connect CM node connection */
3335 cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3336 conn_param->private_data_len, (void *)conn_param->private_data,
3337 &cm_info);
3338 if (!cm_node) {
3339 if (apbvt_set)
3340 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3341 PCI_FUNC(nesdev->pcidev->devfn),
3342 NES_MANAGE_APBVT_DEL);
3343
3344 cm_id->rem_ref(cm_id);
3345 return -ENOMEM;
3346 }
3347
3348 cm_node->apbvt_set = apbvt_set;
3349 nesqp->cm_node = cm_node;
3350 cm_node->nesqp = nesqp;
3351 nes_add_ref(&nesqp->ibqp);
3352
3353 return 0;
3354 }
3355
3356
3357 /**
3358 * nes_create_listen
3359 */
3360 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3361 {
3362 struct nes_vnic *nesvnic;
3363 struct nes_cm_listener *cm_node;
3364 struct nes_cm_info cm_info;
3365 int err;
3366
3367 nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3368 cm_id, ntohs(cm_id->local_addr.sin_port));
3369
3370 nesvnic = to_nesvnic(cm_id->device);
3371 if (!nesvnic)
3372 return -EINVAL;
3373
3374 nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3375 nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3376
3377 nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3378 nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3379
3380 /* setup listen params in our api call struct */
3381 cm_info.loc_addr = nesvnic->local_ipaddr;
3382 cm_info.loc_port = cm_id->local_addr.sin_port;
3383 cm_info.backlog = backlog;
3384 cm_info.cm_id = cm_id;
3385
3386 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3387
3388
3389 cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3390 if (!cm_node) {
3391 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3392 __func__, __LINE__);
3393 return -ENOMEM;
3394 }
3395
3396 cm_id->provider_data = cm_node;
3397
3398 if (!cm_node->reused_node) {
3399 err = nes_manage_apbvt(nesvnic,
3400 ntohs(cm_id->local_addr.sin_port),
3401 PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3402 NES_MANAGE_APBVT_ADD);
3403 if (err) {
3404 printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3405 err);
3406 g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3407 return err;
3408 }
3409 atomic_inc(&cm_listens_created);
3410 }
3411
3412 cm_id->add_ref(cm_id);
3413 cm_id->provider_data = (void *)cm_node;
3414
3415
3416 return 0;
3417 }
3418
3419
3420 /**
3421 * nes_destroy_listen
3422 */
3423 int nes_destroy_listen(struct iw_cm_id *cm_id)
3424 {
3425 if (cm_id->provider_data)
3426 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3427 else
3428 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3429
3430 cm_id->rem_ref(cm_id);
3431
3432 return 0;
3433 }
3434
3435
3436 /**
3437 * nes_cm_recv
3438 */
3439 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3440 {
3441 int rc = 0;
3442
3443 cm_packets_received++;
3444 if ((g_cm_core) && (g_cm_core->api))
3445 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3446 else
3447 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3448 " cm is not setup properly.\n");
3449
3450 return rc;
3451 }
3452
3453
3454 /**
3455 * nes_cm_start
3456 * Start and init a cm core module
3457 */
3458 int nes_cm_start(void)
3459 {
3460 nes_debug(NES_DBG_CM, "\n");
3461 /* create the primary CM core, pass this handle to subsequent core inits */
3462 g_cm_core = nes_cm_alloc_core();
3463 if (g_cm_core)
3464 return 0;
3465 else
3466 return -ENOMEM;
3467 }
3468
3469
3470 /**
3471 * nes_cm_stop
3472 * stop and dealloc all cm core instances
3473 */
3474 int nes_cm_stop(void)
3475 {
3476 g_cm_core->api->destroy_cm_core(g_cm_core);
3477 return 0;
3478 }
3479
3480
3481 /**
3482 * cm_event_connected
3483 * handle a connected event, setup QPs and HW
3484 */
3485 static void cm_event_connected(struct nes_cm_event *event)
3486 {
3487 struct nes_qp *nesqp;
3488 struct nes_vnic *nesvnic;
3489 struct nes_device *nesdev;
3490 struct nes_cm_node *cm_node;
3491 struct nes_adapter *nesadapter;
3492 struct ib_qp_attr attr;
3493 struct iw_cm_id *cm_id;
3494 struct iw_cm_event cm_event;
3495 struct nes_v4_quad nes_quad;
3496 u32 crc_value;
3497 int ret;
3498
3499 /* get all our handles */
3500 cm_node = event->cm_node;
3501 cm_id = cm_node->cm_id;
3502 nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3503 nesqp = (struct nes_qp *)cm_id->provider_data;
3504 nesvnic = to_nesvnic(nesqp->ibqp.device);
3505 nesdev = nesvnic->nesdev;
3506 nesadapter = nesdev->nesadapter;
3507
3508 if (nesqp->destroyed)
3509 return;
3510 atomic_inc(&cm_connecteds);
3511 nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
3512 " local port 0x%04X. jiffies = %lu.\n",
3513 nesqp->hwqp.qp_id,
3514 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3515 ntohs(cm_id->remote_addr.sin_port),
3516 ntohs(cm_id->local_addr.sin_port),
3517 jiffies);
3518
3519 nes_cm_init_tsa_conn(nesqp, cm_node);
3520
3521 /* set the QP tsa context */
3522 nesqp->nesqp_context->tcpPorts[0] =
3523 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3524 nesqp->nesqp_context->tcpPorts[1] =
3525 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3526 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3527 nesqp->nesqp_context->ip0 =
3528 cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3529 else
3530 nesqp->nesqp_context->ip0 =
3531 cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3532
3533 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3534 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3535 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3536 nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3537 nes_arp_table(nesdev,
3538 le32_to_cpu(nesqp->nesqp_context->ip0),
3539 NULL, NES_ARP_RESOLVE) << 16);
3540 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3541 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3542 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3543 nesqp->nesqp_context->ird_ord_sizes |=
3544 cpu_to_le32((u32)1 <<
3545 NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3546
3547 /* Adjust tail for not having a LSMM */
3548 /*nesqp->hwqp.sq_tail = 1;*/
3549
3550 build_rdma0_msg(cm_node, &nesqp);
3551
3552 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3553 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3554
3555 memset(&nes_quad, 0, sizeof(nes_quad));
3556
3557 nes_quad.DstIpAdrIndex =
3558 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3559 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3560 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3561 else
3562 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3563 nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3564 nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3565
3566 /* Produce hash key */
3567 crc_value = get_crc_value(&nes_quad);
3568 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3569 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3570 nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3571
3572 nesqp->hte_index &= nesadapter->hte_index_mask;
3573 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3574
3575 nesqp->ietf_frame = &cm_node->mpa_frame;
3576 nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3577 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3578
3579 /* notify OF layer we successfully created the requested connection */
3580 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3581 cm_event.status = 0;
3582 cm_event.provider_data = cm_id->provider_data;
3583 cm_event.local_addr.sin_family = AF_INET;
3584 cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3585 cm_event.remote_addr = cm_id->remote_addr;
3586
3587 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3588 cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3589 cm_event.ird = cm_node->ird_size;
3590 cm_event.ord = cm_node->ord_size;
3591
3592 cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3593 ret = cm_id->event_handler(cm_id, &cm_event);
3594 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3595
3596 if (ret)
3597 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3598 "ret=%d\n", __func__, __LINE__, ret);
3599 attr.qp_state = IB_QPS_RTS;
3600 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3601
3602 nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3603 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3604
3605 return;
3606 }
3607
3608
3609 /**
3610 * cm_event_connect_error
3611 */
3612 static void cm_event_connect_error(struct nes_cm_event *event)
3613 {
3614 struct nes_qp *nesqp;
3615 struct iw_cm_id *cm_id;
3616 struct iw_cm_event cm_event;
3617 /* struct nes_cm_info cm_info; */
3618 int ret;
3619
3620 if (!event->cm_node)
3621 return;
3622
3623 cm_id = event->cm_node->cm_id;
3624 if (!cm_id)
3625 return;
3626
3627 nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3628 nesqp = cm_id->provider_data;
3629
3630 if (!nesqp)
3631 return;
3632
3633 /* notify OF layer about this connection error event */
3634 /* cm_id->rem_ref(cm_id); */
3635 nesqp->cm_id = NULL;
3636 cm_id->provider_data = NULL;
3637 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3638 cm_event.status = -ECONNRESET;
3639 cm_event.provider_data = cm_id->provider_data;
3640 cm_event.local_addr = cm_id->local_addr;
3641 cm_event.remote_addr = cm_id->remote_addr;
3642 cm_event.private_data = NULL;
3643 cm_event.private_data_len = 0;
3644
3645 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3646 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3647 cm_event.remote_addr.sin_addr.s_addr);
3648
3649 ret = cm_id->event_handler(cm_id, &cm_event);
3650 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3651 if (ret)
3652 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3653 "ret=%d\n", __func__, __LINE__, ret);
3654 cm_id->rem_ref(cm_id);
3655
3656 rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3657 return;
3658 }
3659
3660
3661 /**
3662 * cm_event_reset
3663 */
3664 static void cm_event_reset(struct nes_cm_event *event)
3665 {
3666 struct nes_qp *nesqp;
3667 struct iw_cm_id *cm_id;
3668 struct iw_cm_event cm_event;
3669 /* struct nes_cm_info cm_info; */
3670 int ret;
3671
3672 if (!event->cm_node)
3673 return;
3674
3675 if (!event->cm_node->cm_id)
3676 return;
3677
3678 cm_id = event->cm_node->cm_id;
3679
3680 nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3681 nesqp = cm_id->provider_data;
3682 if (!nesqp)
3683 return;
3684
3685 nesqp->cm_id = NULL;
3686 /* cm_id->provider_data = NULL; */
3687 cm_event.event = IW_CM_EVENT_DISCONNECT;
3688 cm_event.status = -ECONNRESET;
3689 cm_event.provider_data = cm_id->provider_data;
3690 cm_event.local_addr = cm_id->local_addr;
3691 cm_event.remote_addr = cm_id->remote_addr;
3692 cm_event.private_data = NULL;
3693 cm_event.private_data_len = 0;
3694
3695 cm_id->add_ref(cm_id);
3696 ret = cm_id->event_handler(cm_id, &cm_event);
3697 atomic_inc(&cm_closes);
3698 cm_event.event = IW_CM_EVENT_CLOSE;
3699 cm_event.status = 0;
3700 cm_event.provider_data = cm_id->provider_data;
3701 cm_event.local_addr = cm_id->local_addr;
3702 cm_event.remote_addr = cm_id->remote_addr;
3703 cm_event.private_data = NULL;
3704 cm_event.private_data_len = 0;
3705 nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3706 ret = cm_id->event_handler(cm_id, &cm_event);
3707
3708 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3709
3710
3711 /* notify OF layer about this connection error event */
3712 cm_id->rem_ref(cm_id);
3713
3714 return;
3715 }
3716
3717
3718 /**
3719 * cm_event_mpa_req
3720 */
3721 static void cm_event_mpa_req(struct nes_cm_event *event)
3722 {
3723 struct iw_cm_id *cm_id;
3724 struct iw_cm_event cm_event;
3725 int ret;
3726 struct nes_cm_node *cm_node;
3727
3728 cm_node = event->cm_node;
3729 if (!cm_node)
3730 return;
3731 cm_id = cm_node->cm_id;
3732
3733 atomic_inc(&cm_connect_reqs);
3734 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3735 cm_node, cm_id, jiffies);
3736
3737 cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3738 cm_event.status = 0;
3739 cm_event.provider_data = (void *)cm_node;
3740
3741 cm_event.local_addr.sin_family = AF_INET;
3742 cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3743 cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3744
3745 cm_event.remote_addr.sin_family = AF_INET;
3746 cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3747 cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3748 cm_event.private_data = cm_node->mpa_frame_buf;
3749 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3750 cm_event.ird = cm_node->ird_size;
3751 cm_event.ord = cm_node->ord_size;
3752
3753 ret = cm_id->event_handler(cm_id, &cm_event);
3754 if (ret)
3755 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3756 __func__, __LINE__, ret);
3757 return;
3758 }
3759
3760
3761 static void cm_event_mpa_reject(struct nes_cm_event *event)
3762 {
3763 struct iw_cm_id *cm_id;
3764 struct iw_cm_event cm_event;
3765 struct nes_cm_node *cm_node;
3766 int ret;
3767
3768 cm_node = event->cm_node;
3769 if (!cm_node)
3770 return;
3771 cm_id = cm_node->cm_id;
3772
3773 atomic_inc(&cm_connect_reqs);
3774 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3775 cm_node, cm_id, jiffies);
3776
3777 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3778 cm_event.status = -ECONNREFUSED;
3779 cm_event.provider_data = cm_id->provider_data;
3780
3781 cm_event.local_addr.sin_family = AF_INET;
3782 cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3783 cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3784
3785 cm_event.remote_addr.sin_family = AF_INET;
3786 cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3787 cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3788
3789 cm_event.private_data = cm_node->mpa_frame_buf;
3790 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3791
3792 nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3793 "remove_addr=%08x\n",
3794 cm_event.local_addr.sin_addr.s_addr,
3795 cm_event.remote_addr.sin_addr.s_addr);
3796
3797 ret = cm_id->event_handler(cm_id, &cm_event);
3798 if (ret)
3799 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3800 __func__, __LINE__, ret);
3801
3802 return;
3803 }
3804
3805
3806 static void nes_cm_event_handler(struct work_struct *);
3807
3808 /**
3809 * nes_cm_post_event
3810 * post an event to the cm event handler
3811 */
3812 static int nes_cm_post_event(struct nes_cm_event *event)
3813 {
3814 atomic_inc(&event->cm_node->cm_core->events_posted);
3815 add_ref_cm_node(event->cm_node);
3816 event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3817 INIT_WORK(&event->event_work, nes_cm_event_handler);
3818 nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3819 event->cm_node, event);
3820
3821 queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3822
3823 nes_debug(NES_DBG_CM, "Exit\n");
3824 return 0;
3825 }
3826
3827
3828 /**
3829 * nes_cm_event_handler
3830 * worker function to handle cm events
3831 * will free instance of nes_cm_event
3832 */
3833 static void nes_cm_event_handler(struct work_struct *work)
3834 {
3835 struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3836 event_work);
3837 struct nes_cm_core *cm_core;
3838
3839 if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3840 return;
3841
3842 cm_core = event->cm_node->cm_core;
3843 nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3844 event, event->type, atomic_read(&cm_core->events_posted));
3845
3846 switch (event->type) {
3847 case NES_CM_EVENT_MPA_REQ:
3848 cm_event_mpa_req(event);
3849 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3850 event->cm_node);
3851 break;
3852 case NES_CM_EVENT_RESET:
3853 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3854 event->cm_node);
3855 cm_event_reset(event);
3856 break;
3857 case NES_CM_EVENT_CONNECTED:
3858 if ((!event->cm_node->cm_id) ||
3859 (event->cm_node->state != NES_CM_STATE_TSA))
3860 break;
3861 cm_event_connected(event);
3862 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3863 break;
3864 case NES_CM_EVENT_MPA_REJECT:
3865 if ((!event->cm_node->cm_id) ||
3866 (event->cm_node->state == NES_CM_STATE_TSA))
3867 break;
3868 cm_event_mpa_reject(event);
3869 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3870 break;
3871
3872 case NES_CM_EVENT_ABORTED:
3873 if ((!event->cm_node->cm_id) ||
3874 (event->cm_node->state == NES_CM_STATE_TSA))
3875 break;
3876 cm_event_connect_error(event);
3877 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3878 break;
3879 case NES_CM_EVENT_DROPPED_PKT:
3880 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3881 break;
3882 default:
3883 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3884 break;
3885 }
3886
3887 atomic_dec(&cm_core->events_posted);
3888 event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3889 rem_ref_cm_node(cm_core, event->cm_node);
3890 kfree(event);
3891
3892 return;
3893 }
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