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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / infiniband / hw / nes / nes_cm.c
bloba4972abedef1e967acafc123cfe3fe14bbbabecb
1 /*
2 * Copyright (c) 2006 - 2011 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 struct ietf_mpa_v1 *mpa_frame;
237
238 skb = dev_alloc_skb(MAX_CM_BUFFER);
239 if (!skb) {
240 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
241 return -ENOMEM;
242 }
243
244 /* send an MPA reject frame */
245 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
246 mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
247 mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
248 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
249
250 cm_node->state = NES_CM_STATE_FIN_WAIT1;
251 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
252 }
253
254
255 /**
256 * recv_mpa - process a received TCP pkt, we are expecting an
257 * IETF MPA frame
258 */
259 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
260 u32 len)
261 {
262 struct ietf_mpa_v1 *mpa_frame;
263 struct ietf_mpa_v2 *mpa_v2_frame;
264 struct ietf_rtr_msg *rtr_msg;
265 int mpa_hdr_len;
266 int priv_data_len;
267
268 *type = NES_MPA_REQUEST_ACCEPT;
269
270 /* assume req frame is in tcp data payload */
271 if (len < sizeof(struct ietf_mpa_v1)) {
272 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
273 return -EINVAL;
274 }
275
276 /* points to the beginning of the frame, which could be MPA V1 or V2 */
277 mpa_frame = (struct ietf_mpa_v1 *)buffer;
278 mpa_hdr_len = sizeof(struct ietf_mpa_v1);
279 priv_data_len = ntohs(mpa_frame->priv_data_len);
280
281 /* make sure mpa private data len is less than 512 bytes */
282 if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
283 nes_debug(NES_DBG_CM, "The received Length of Private"
284 " Data field exceeds 512 octets\n");
285 return -EINVAL;
286 }
287 /*
288 * make sure MPA receiver interoperate with the
289 * received MPA version and MPA key information
290 *
291 */
292 if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
293 nes_debug(NES_DBG_CM, "The received mpa version"
294 " is not supported\n");
295 return -EINVAL;
296 }
297 /*
298 * backwards compatibility only
299 */
300 if (mpa_frame->rev > cm_node->mpa_frame_rev) {
301 nes_debug(NES_DBG_CM, "The received mpa version"
302 " can not be interoperated\n");
303 return -EINVAL;
304 } else {
305 cm_node->mpa_frame_rev = mpa_frame->rev;
306 }
307
308 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
309 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
310 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
311 return -EINVAL;
312 }
313 } else {
314 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
315 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
316 return -EINVAL;
317 }
318 }
319
320
321 if (priv_data_len + mpa_hdr_len != len) {
322 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
323 " complete (%x + %x != %x)\n",
324 priv_data_len, mpa_hdr_len, len);
325 return -EINVAL;
326 }
327 /* make sure it does not exceed the max size */
328 if (len > MAX_CM_BUFFER) {
329 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
330 " (%x + %x != %x)\n",
331 priv_data_len, mpa_hdr_len, len);
332 return -EINVAL;
333 }
334
335 cm_node->mpa_frame_size = priv_data_len;
336
337 switch (mpa_frame->rev) {
338 case IETF_MPA_V2: {
339 u16 ird_size;
340 u16 ord_size;
341 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
342 mpa_hdr_len += IETF_RTR_MSG_SIZE;
343 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
344 rtr_msg = &mpa_v2_frame->rtr_msg;
345
346 /* parse rtr message */
347 rtr_msg->ctrl_ird = ntohs(rtr_msg->ctrl_ird);
348 rtr_msg->ctrl_ord = ntohs(rtr_msg->ctrl_ord);
349 ird_size = rtr_msg->ctrl_ird & IETF_NO_IRD_ORD;
350 ord_size = rtr_msg->ctrl_ord & IETF_NO_IRD_ORD;
351
352 if (!(rtr_msg->ctrl_ird & IETF_PEER_TO_PEER)) {
353 /* send reset */
354 return -EINVAL;
355 }
356
357 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
358 /* responder */
359 if (cm_node->ord_size > ird_size)
360 cm_node->ord_size = ird_size;
361 } else {
362 /* initiator */
363 if (cm_node->ord_size > ird_size)
364 cm_node->ord_size = ird_size;
365
366 if (cm_node->ird_size < ord_size) {
367 /* no resources available */
368 /* send terminate message */
369 return -EINVAL;
370 }
371 }
372
373 if (rtr_msg->ctrl_ord & IETF_RDMA0_READ) {
374 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
375 } else if (rtr_msg->ctrl_ord & IETF_RDMA0_WRITE) {
376 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
377 } else { /* Not supported RDMA0 operation */
378 return -EINVAL;
379 }
380 break;
381 }
382 case IETF_MPA_V1:
383 default:
384 break;
385 }
386
387 /* copy entire MPA frame to our cm_node's frame */
388 memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
389
390 if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
391 *type = NES_MPA_REQUEST_REJECT;
392 return 0;
393 }
394
395
396 /**
397 * form_cm_frame - get a free packet and build empty frame Use
398 * node info to build.
399 */
400 static void form_cm_frame(struct sk_buff *skb,
401 struct nes_cm_node *cm_node, void *options, u32 optionsize,
402 void *data, u32 datasize, u8 flags)
403 {
404 struct tcphdr *tcph;
405 struct iphdr *iph;
406 struct ethhdr *ethh;
407 u8 *buf;
408 u16 packetsize = sizeof(*iph);
409
410 packetsize += sizeof(*tcph);
411 packetsize += optionsize + datasize;
412
413 skb_trim(skb, 0);
414 memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
415
416 buf = skb_put(skb, packetsize + ETH_HLEN);
417
418 ethh = (struct ethhdr *)buf;
419 buf += ETH_HLEN;
420
421 iph = (struct iphdr *)buf;
422 buf += sizeof(*iph);
423 tcph = (struct tcphdr *)buf;
424 skb_reset_mac_header(skb);
425 skb_set_network_header(skb, ETH_HLEN);
426 skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
427 buf += sizeof(*tcph);
428
429 skb->ip_summed = CHECKSUM_PARTIAL;
430 skb->protocol = htons(0x800);
431 skb->data_len = 0;
432 skb->mac_len = ETH_HLEN;
433
434 memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
435 memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
436 ethh->h_proto = htons(0x0800);
437
438 iph->version = IPVERSION;
439 iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
440 iph->tos = 0;
441 iph->tot_len = htons(packetsize);
442 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
443
444 iph->frag_off = htons(0x4000);
445 iph->ttl = 0x40;
446 iph->protocol = 0x06; /* IPPROTO_TCP */
447
448 iph->saddr = htonl(cm_node->loc_addr);
449 iph->daddr = htonl(cm_node->rem_addr);
450
451 tcph->source = htons(cm_node->loc_port);
452 tcph->dest = htons(cm_node->rem_port);
453 tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
454
455 if (flags & SET_ACK) {
456 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
457 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
458 tcph->ack = 1;
459 } else {
460 tcph->ack_seq = 0;
461 }
462
463 if (flags & SET_SYN) {
464 cm_node->tcp_cntxt.loc_seq_num++;
465 tcph->syn = 1;
466 } else {
467 cm_node->tcp_cntxt.loc_seq_num += datasize;
468 }
469
470 if (flags & SET_FIN) {
471 cm_node->tcp_cntxt.loc_seq_num++;
472 tcph->fin = 1;
473 }
474
475 if (flags & SET_RST)
476 tcph->rst = 1;
477
478 tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
479 tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
480 tcph->urg_ptr = 0;
481 if (optionsize)
482 memcpy(buf, options, optionsize);
483 buf += optionsize;
484 if (datasize)
485 memcpy(buf, data, datasize);
486
487 skb_shinfo(skb)->nr_frags = 0;
488 cm_packets_created++;
489 }
490
491 /**
492 * print_core - dump a cm core
493 */
494 static void print_core(struct nes_cm_core *core)
495 {
496 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
497 nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
498 if (!core)
499 return;
500 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
501
502 nes_debug(NES_DBG_CM, "State : %u \n", core->state);
503
504 nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
505 nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
506
507 nes_debug(NES_DBG_CM, "core : %p \n", core);
508
509 nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
510 }
511
512 /**
513 * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
514 */
515 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
516 u16 *buff_len, u8 *pci_mem, u8 mpa_key)
517 {
518 int ret = 0;
519
520 *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
521
522 switch (cm_node->mpa_frame_rev) {
523 case IETF_MPA_V1:
524 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
525 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
526 build_mpa_v1(cm_node, *start_buff, mpa_key);
527 break;
528 case IETF_MPA_V2:
529 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
530 build_mpa_v2(cm_node, *start_buff, mpa_key);
531 break;
532 default:
533 ret = -EINVAL;
534 }
535 return ret;
536 }
537
538 /**
539 * build_mpa_v2 - build a MPA V2 frame
540 */
541 static void build_mpa_v2(struct nes_cm_node *cm_node,
542 void *start_addr, u8 mpa_key)
543 {
544 struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
545 struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
546
547 /* initialize the upper 5 bytes of the frame */
548 build_mpa_v1(cm_node, start_addr, mpa_key);
549 mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
550 mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
551
552 /* initialize RTR msg */
553 rtr_msg->ctrl_ird = (cm_node->ird_size > IETF_NO_IRD_ORD) ?
554 IETF_NO_IRD_ORD : cm_node->ird_size;
555 rtr_msg->ctrl_ord = (cm_node->ord_size > IETF_NO_IRD_ORD) ?
556 IETF_NO_IRD_ORD : cm_node->ord_size;
557
558 rtr_msg->ctrl_ird |= IETF_PEER_TO_PEER;
559 rtr_msg->ctrl_ird |= IETF_FLPDU_ZERO_LEN;
560
561 switch (mpa_key) {
562 case MPA_KEY_REQUEST:
563 rtr_msg->ctrl_ord |= IETF_RDMA0_WRITE;
564 rtr_msg->ctrl_ord |= IETF_RDMA0_READ;
565 break;
566 case MPA_KEY_REPLY:
567 switch (cm_node->send_rdma0_op) {
568 case SEND_RDMA_WRITE_ZERO:
569 rtr_msg->ctrl_ord |= IETF_RDMA0_WRITE;
570 break;
571 case SEND_RDMA_READ_ZERO:
572 rtr_msg->ctrl_ord |= IETF_RDMA0_READ;
573 break;
574 }
575 }
576 rtr_msg->ctrl_ird = htons(rtr_msg->ctrl_ird);
577 rtr_msg->ctrl_ord = htons(rtr_msg->ctrl_ord);
578 }
579
580 /**
581 * build_mpa_v1 - build a MPA V1 frame
582 */
583 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
584 {
585 struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
586
587 switch (mpa_key) {
588 case MPA_KEY_REQUEST:
589 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
590 break;
591 case MPA_KEY_REPLY:
592 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
593 break;
594 }
595 mpa_frame->flags = IETF_MPA_FLAGS_CRC;
596 mpa_frame->rev = cm_node->mpa_frame_rev;
597 mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
598 }
599
600 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
601 {
602 u64 u64temp;
603 struct nes_qp *nesqp = *nesqp_addr;
604 struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
605
606 u64temp = (unsigned long)nesqp;
607 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
608 set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
609
610 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
611 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
612
613 switch (cm_node->send_rdma0_op) {
614 case SEND_RDMA_WRITE_ZERO:
615 nes_debug(NES_DBG_CM, "Sending first write.\n");
616 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
617 cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
618 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
619 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
620 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
621 break;
622
623 case SEND_RDMA_READ_ZERO:
624 default:
625 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO) {
626 printk(KERN_ERR "%s[%u]: Unsupported RDMA0 len operation=%u\n",
627 __func__, __LINE__, cm_node->send_rdma0_op);
628 WARN_ON(1);
629 }
630 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
631 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
632 cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
633 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
634 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
635 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
636 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
637 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
638 break;
639 }
640
641 if (nesqp->sq_kmapped) {
642 nesqp->sq_kmapped = 0;
643 kunmap(nesqp->page);
644 }
645
646 /*use the reserved spot on the WQ for the extra first WQE*/
647 nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
648 NES_QPCONTEXT_ORDIRD_WRPDU |
649 NES_QPCONTEXT_ORDIRD_ALSMM));
650 nesqp->skip_lsmm = 1;
651 nesqp->hwqp.sq_tail = 0;
652 }
653
654 /**
655 * schedule_nes_timer
656 * note - cm_node needs to be protected before calling this. Encase in:
657 * rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
658 */
659 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
660 enum nes_timer_type type, int send_retrans,
661 int close_when_complete)
662 {
663 unsigned long flags;
664 struct nes_cm_core *cm_core = cm_node->cm_core;
665 struct nes_timer_entry *new_send;
666 int ret = 0;
667 u32 was_timer_set;
668
669 new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
670 if (!new_send)
671 return -ENOMEM;
672
673 /* new_send->timetosend = currenttime */
674 new_send->retrycount = NES_DEFAULT_RETRYS;
675 new_send->retranscount = NES_DEFAULT_RETRANS;
676 new_send->skb = skb;
677 new_send->timetosend = jiffies;
678 new_send->type = type;
679 new_send->netdev = cm_node->netdev;
680 new_send->send_retrans = send_retrans;
681 new_send->close_when_complete = close_when_complete;
682
683 if (type == NES_TIMER_TYPE_CLOSE) {
684 new_send->timetosend += (HZ / 10);
685 if (cm_node->recv_entry) {
686 kfree(new_send);
687 WARN_ON(1);
688 return -EINVAL;
689 }
690 cm_node->recv_entry = new_send;
691 }
692
693 if (type == NES_TIMER_TYPE_SEND) {
694 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
695 atomic_inc(&new_send->skb->users);
696 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
697 cm_node->send_entry = new_send;
698 add_ref_cm_node(cm_node);
699 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
700 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
701
702 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
703 if (ret != NETDEV_TX_OK) {
704 nes_debug(NES_DBG_CM, "Error sending packet %p "
705 "(jiffies = %lu)\n", new_send, jiffies);
706 new_send->timetosend = jiffies;
707 ret = NETDEV_TX_OK;
708 } else {
709 cm_packets_sent++;
710 if (!send_retrans) {
711 cleanup_retrans_entry(cm_node);
712 if (close_when_complete)
713 rem_ref_cm_node(cm_core, cm_node);
714 return ret;
715 }
716 }
717 }
718
719 was_timer_set = timer_pending(&cm_core->tcp_timer);
720
721 if (!was_timer_set) {
722 cm_core->tcp_timer.expires = new_send->timetosend;
723 add_timer(&cm_core->tcp_timer);
724 }
725
726 return ret;
727 }
728
729 static void nes_retrans_expired(struct nes_cm_node *cm_node)
730 {
731 struct iw_cm_id *cm_id = cm_node->cm_id;
732 enum nes_cm_node_state state = cm_node->state;
733 cm_node->state = NES_CM_STATE_CLOSED;
734
735 switch (state) {
736 case NES_CM_STATE_SYN_RCVD:
737 case NES_CM_STATE_CLOSING:
738 rem_ref_cm_node(cm_node->cm_core, cm_node);
739 break;
740 case NES_CM_STATE_LAST_ACK:
741 case NES_CM_STATE_FIN_WAIT1:
742 if (cm_node->cm_id)
743 cm_id->rem_ref(cm_id);
744 send_reset(cm_node, NULL);
745 break;
746 default:
747 add_ref_cm_node(cm_node);
748 send_reset(cm_node, NULL);
749 create_event(cm_node, NES_CM_EVENT_ABORTED);
750 }
751 }
752
753 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
754 {
755 struct nes_timer_entry *recv_entry = cm_node->recv_entry;
756 struct iw_cm_id *cm_id = cm_node->cm_id;
757 struct nes_qp *nesqp;
758 unsigned long qplockflags;
759
760 if (!recv_entry)
761 return;
762 nesqp = (struct nes_qp *)recv_entry->skb;
763 if (nesqp) {
764 spin_lock_irqsave(&nesqp->lock, qplockflags);
765 if (nesqp->cm_id) {
766 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
767 "refcount = %d: HIT A "
768 "NES_TIMER_TYPE_CLOSE with something "
769 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
770 atomic_read(&nesqp->refcount));
771 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
772 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
773 nesqp->ibqp_state = IB_QPS_ERR;
774 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
775 nes_cm_disconn(nesqp);
776 } else {
777 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
778 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
779 "refcount = %d: HIT A "
780 "NES_TIMER_TYPE_CLOSE with nothing "
781 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
782 atomic_read(&nesqp->refcount));
783 }
784 } else if (rem_node) {
785 /* TIME_WAIT state */
786 rem_ref_cm_node(cm_node->cm_core, cm_node);
787 }
788 if (cm_node->cm_id)
789 cm_id->rem_ref(cm_id);
790 kfree(recv_entry);
791 cm_node->recv_entry = NULL;
792 }
793
794 /**
795 * nes_cm_timer_tick
796 */
797 static void nes_cm_timer_tick(unsigned long pass)
798 {
799 unsigned long flags;
800 unsigned long nexttimeout = jiffies + NES_LONG_TIME;
801 struct nes_cm_node *cm_node;
802 struct nes_timer_entry *send_entry, *recv_entry;
803 struct list_head *list_core_temp;
804 struct list_head *list_node;
805 struct nes_cm_core *cm_core = g_cm_core;
806 u32 settimer = 0;
807 unsigned long timetosend;
808 int ret = NETDEV_TX_OK;
809
810 struct list_head timer_list;
811
812 INIT_LIST_HEAD(&timer_list);
813 spin_lock_irqsave(&cm_core->ht_lock, flags);
814
815 list_for_each_safe(list_node, list_core_temp,
816 &cm_core->connected_nodes) {
817 cm_node = container_of(list_node, struct nes_cm_node, list);
818 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
819 add_ref_cm_node(cm_node);
820 list_add(&cm_node->timer_entry, &timer_list);
821 }
822 }
823 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
824
825 list_for_each_safe(list_node, list_core_temp, &timer_list) {
826 cm_node = container_of(list_node, struct nes_cm_node,
827 timer_entry);
828 recv_entry = cm_node->recv_entry;
829
830 if (recv_entry) {
831 if (time_after(recv_entry->timetosend, jiffies)) {
832 if (nexttimeout > recv_entry->timetosend ||
833 !settimer) {
834 nexttimeout = recv_entry->timetosend;
835 settimer = 1;
836 }
837 } else {
838 handle_recv_entry(cm_node, 1);
839 }
840 }
841
842 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
843 do {
844 send_entry = cm_node->send_entry;
845 if (!send_entry)
846 break;
847 if (time_after(send_entry->timetosend, jiffies)) {
848 if (cm_node->state != NES_CM_STATE_TSA) {
849 if ((nexttimeout >
850 send_entry->timetosend) ||
851 !settimer) {
852 nexttimeout =
853 send_entry->timetosend;
854 settimer = 1;
855 }
856 } else {
857 free_retrans_entry(cm_node);
858 }
859 break;
860 }
861
862 if ((cm_node->state == NES_CM_STATE_TSA) ||
863 (cm_node->state == NES_CM_STATE_CLOSED)) {
864 free_retrans_entry(cm_node);
865 break;
866 }
867
868 if (!send_entry->retranscount ||
869 !send_entry->retrycount) {
870 cm_packets_dropped++;
871 free_retrans_entry(cm_node);
872
873 spin_unlock_irqrestore(
874 &cm_node->retrans_list_lock, flags);
875 nes_retrans_expired(cm_node);
876 cm_node->state = NES_CM_STATE_CLOSED;
877 spin_lock_irqsave(&cm_node->retrans_list_lock,
878 flags);
879 break;
880 }
881 atomic_inc(&send_entry->skb->users);
882 cm_packets_retrans++;
883 nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
884 "for node %p, jiffies = %lu, time to send = "
885 "%lu, retranscount = %u, send_entry->seq_num = "
886 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
887 "0x%08X\n", send_entry, cm_node, jiffies,
888 send_entry->timetosend,
889 send_entry->retranscount,
890 send_entry->seq_num,
891 cm_node->tcp_cntxt.rem_ack_num);
892
893 spin_unlock_irqrestore(&cm_node->retrans_list_lock,
894 flags);
895 ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
896 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
897 if (ret != NETDEV_TX_OK) {
898 nes_debug(NES_DBG_CM, "rexmit failed for "
899 "node=%p\n", cm_node);
900 cm_packets_bounced++;
901 send_entry->retrycount--;
902 nexttimeout = jiffies + NES_SHORT_TIME;
903 settimer = 1;
904 break;
905 } else {
906 cm_packets_sent++;
907 }
908 nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
909 "%u, retry count = %u.\n",
910 send_entry->retranscount,
911 send_entry->retrycount);
912 if (send_entry->send_retrans) {
913 send_entry->retranscount--;
914 timetosend = (NES_RETRY_TIMEOUT <<
915 (NES_DEFAULT_RETRANS - send_entry->retranscount));
916
917 send_entry->timetosend = jiffies +
918 min(timetosend, NES_MAX_TIMEOUT);
919 if (nexttimeout > send_entry->timetosend ||
920 !settimer) {
921 nexttimeout = send_entry->timetosend;
922 settimer = 1;
923 }
924 } else {
925 int close_when_complete;
926 close_when_complete =
927 send_entry->close_when_complete;
928 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
929 cm_node, cm_node->state);
930 free_retrans_entry(cm_node);
931 if (close_when_complete)
932 rem_ref_cm_node(cm_node->cm_core,
933 cm_node);
934 }
935 } while (0);
936
937 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
938 rem_ref_cm_node(cm_node->cm_core, cm_node);
939 }
940
941 if (settimer) {
942 if (!timer_pending(&cm_core->tcp_timer)) {
943 cm_core->tcp_timer.expires = nexttimeout;
944 add_timer(&cm_core->tcp_timer);
945 }
946 }
947 }
948
949
950 /**
951 * send_syn
952 */
953 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
954 struct sk_buff *skb)
955 {
956 int ret;
957 int flags = SET_SYN;
958 char optionsbuffer[sizeof(struct option_mss) +
959 sizeof(struct option_windowscale) + sizeof(struct option_base) +
960 TCP_OPTIONS_PADDING];
961
962 int optionssize = 0;
963 /* Sending MSS option */
964 union all_known_options *options;
965
966 if (!cm_node)
967 return -EINVAL;
968
969 options = (union all_known_options *)&optionsbuffer[optionssize];
970 options->as_mss.optionnum = OPTION_NUMBER_MSS;
971 options->as_mss.length = sizeof(struct option_mss);
972 options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
973 optionssize += sizeof(struct option_mss);
974
975 options = (union all_known_options *)&optionsbuffer[optionssize];
976 options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
977 options->as_windowscale.length = sizeof(struct option_windowscale);
978 options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
979 optionssize += sizeof(struct option_windowscale);
980
981 if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
982 options = (union all_known_options *)&optionsbuffer[optionssize];
983 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
984 options->as_base.length = sizeof(struct option_base);
985 optionssize += sizeof(struct option_base);
986 /* we need the size to be a multiple of 4 */
987 options = (union all_known_options *)&optionsbuffer[optionssize];
988 options->as_end = 1;
989 optionssize += 1;
990 options = (union all_known_options *)&optionsbuffer[optionssize];
991 options->as_end = 1;
992 optionssize += 1;
993 }
994
995 options = (union all_known_options *)&optionsbuffer[optionssize];
996 options->as_end = OPTION_NUMBER_END;
997 optionssize += 1;
998
999 if (!skb)
1000 skb = dev_alloc_skb(MAX_CM_BUFFER);
1001 if (!skb) {
1002 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1003 return -1;
1004 }
1005
1006 if (sendack)
1007 flags |= SET_ACK;
1008
1009 form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1010 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1011
1012 return ret;
1013 }
1014
1015
1016 /**
1017 * send_reset
1018 */
1019 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1020 {
1021 int ret;
1022 int flags = SET_RST | SET_ACK;
1023
1024 if (!skb)
1025 skb = dev_alloc_skb(MAX_CM_BUFFER);
1026 if (!skb) {
1027 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1028 return -ENOMEM;
1029 }
1030
1031 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1032 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1033
1034 return ret;
1035 }
1036
1037
1038 /**
1039 * send_ack
1040 */
1041 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1042 {
1043 int ret;
1044
1045 if (!skb)
1046 skb = dev_alloc_skb(MAX_CM_BUFFER);
1047
1048 if (!skb) {
1049 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1050 return -1;
1051 }
1052
1053 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1054 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1055
1056 return ret;
1057 }
1058
1059
1060 /**
1061 * send_fin
1062 */
1063 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1064 {
1065 int ret;
1066
1067 /* if we didn't get a frame get one */
1068 if (!skb)
1069 skb = dev_alloc_skb(MAX_CM_BUFFER);
1070
1071 if (!skb) {
1072 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1073 return -1;
1074 }
1075
1076 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1077 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1078
1079 return ret;
1080 }
1081
1082
1083 /**
1084 * find_node - find a cm node that matches the reference cm node
1085 */
1086 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1087 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1088 {
1089 unsigned long flags;
1090 struct list_head *hte;
1091 struct nes_cm_node *cm_node;
1092
1093 /* get a handle on the hte */
1094 hte = &cm_core->connected_nodes;
1095
1096 /* walk list and find cm_node associated with this session ID */
1097 spin_lock_irqsave(&cm_core->ht_lock, flags);
1098 list_for_each_entry(cm_node, hte, list) {
1099 /* compare quad, return node handle if a match */
1100 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1101 cm_node->loc_addr, cm_node->loc_port,
1102 loc_addr, loc_port,
1103 cm_node->rem_addr, cm_node->rem_port,
1104 rem_addr, rem_port);
1105 if ((cm_node->loc_addr == loc_addr) && (cm_node->loc_port == loc_port) &&
1106 (cm_node->rem_addr == rem_addr) && (cm_node->rem_port == rem_port)) {
1107 add_ref_cm_node(cm_node);
1108 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1109 return cm_node;
1110 }
1111 }
1112 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1113
1114 /* no owner node */
1115 return NULL;
1116 }
1117
1118
1119 /**
1120 * find_listener - find a cm node listening on this addr-port pair
1121 */
1122 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1123 nes_addr_t dst_addr, u16 dst_port, enum nes_cm_listener_state listener_state)
1124 {
1125 unsigned long flags;
1126 struct nes_cm_listener *listen_node;
1127
1128 /* walk list and find cm_node associated with this session ID */
1129 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1130 list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1131 /* compare node pair, return node handle if a match */
1132 if (((listen_node->loc_addr == dst_addr) ||
1133 listen_node->loc_addr == 0x00000000) &&
1134 (listen_node->loc_port == dst_port) &&
1135 (listener_state & listen_node->listener_state)) {
1136 atomic_inc(&listen_node->ref_count);
1137 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1138 return listen_node;
1139 }
1140 }
1141 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1142
1143 /* no listener */
1144 return NULL;
1145 }
1146
1147
1148 /**
1149 * add_hte_node - add a cm node to the hash table
1150 */
1151 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1152 {
1153 unsigned long flags;
1154 struct list_head *hte;
1155
1156 if (!cm_node || !cm_core)
1157 return -EINVAL;
1158
1159 nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1160 cm_node);
1161
1162 spin_lock_irqsave(&cm_core->ht_lock, flags);
1163
1164 /* get a handle on the hash table element (list head for this slot) */
1165 hte = &cm_core->connected_nodes;
1166 list_add_tail(&cm_node->list, hte);
1167 atomic_inc(&cm_core->ht_node_cnt);
1168
1169 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1170
1171 return 0;
1172 }
1173
1174
1175 /**
1176 * mini_cm_dec_refcnt_listen
1177 */
1178 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1179 struct nes_cm_listener *listener, int free_hanging_nodes)
1180 {
1181 int ret = -EINVAL;
1182 int err = 0;
1183 unsigned long flags;
1184 struct list_head *list_pos = NULL;
1185 struct list_head *list_temp = NULL;
1186 struct nes_cm_node *cm_node = NULL;
1187 struct list_head reset_list;
1188
1189 nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1190 "refcnt=%d\n", listener, free_hanging_nodes,
1191 atomic_read(&listener->ref_count));
1192 /* free non-accelerated child nodes for this listener */
1193 INIT_LIST_HEAD(&reset_list);
1194 if (free_hanging_nodes) {
1195 spin_lock_irqsave(&cm_core->ht_lock, flags);
1196 list_for_each_safe(list_pos, list_temp,
1197 &g_cm_core->connected_nodes) {
1198 cm_node = container_of(list_pos, struct nes_cm_node,
1199 list);
1200 if ((cm_node->listener == listener) &&
1201 (!cm_node->accelerated)) {
1202 add_ref_cm_node(cm_node);
1203 list_add(&cm_node->reset_entry, &reset_list);
1204 }
1205 }
1206 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1207 }
1208
1209 list_for_each_safe(list_pos, list_temp, &reset_list) {
1210 cm_node = container_of(list_pos, struct nes_cm_node,
1211 reset_entry);
1212 {
1213 struct nes_cm_node *loopback = cm_node->loopbackpartner;
1214 enum nes_cm_node_state old_state;
1215 if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1216 rem_ref_cm_node(cm_node->cm_core, cm_node);
1217 } else {
1218 if (!loopback) {
1219 cleanup_retrans_entry(cm_node);
1220 err = send_reset(cm_node, NULL);
1221 if (err) {
1222 cm_node->state =
1223 NES_CM_STATE_CLOSED;
1224 WARN_ON(1);
1225 } else {
1226 old_state = cm_node->state;
1227 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1228 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1229 rem_ref_cm_node(
1230 cm_node->cm_core,
1231 cm_node);
1232 }
1233 } else {
1234 struct nes_cm_event event;
1235
1236 event.cm_node = loopback;
1237 event.cm_info.rem_addr =
1238 loopback->rem_addr;
1239 event.cm_info.loc_addr =
1240 loopback->loc_addr;
1241 event.cm_info.rem_port =
1242 loopback->rem_port;
1243 event.cm_info.loc_port =
1244 loopback->loc_port;
1245 event.cm_info.cm_id = loopback->cm_id;
1246 add_ref_cm_node(loopback);
1247 loopback->state = NES_CM_STATE_CLOSED;
1248 cm_event_connect_error(&event);
1249 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1250
1251 rem_ref_cm_node(cm_node->cm_core,
1252 cm_node);
1253
1254 }
1255 }
1256 }
1257 }
1258
1259 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1260 if (!atomic_dec_return(&listener->ref_count)) {
1261 list_del(&listener->list);
1262
1263 /* decrement our listen node count */
1264 atomic_dec(&cm_core->listen_node_cnt);
1265
1266 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1267
1268 if (listener->nesvnic)
1269 nes_manage_apbvt(listener->nesvnic, listener->loc_port,
1270 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
1271
1272 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1273
1274 kfree(listener);
1275 listener = NULL;
1276 ret = 0;
1277 atomic_inc(&cm_listens_destroyed);
1278 } else {
1279 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1280 }
1281 if (listener) {
1282 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1283 nes_debug(NES_DBG_CM, "destroying listener (%p)"
1284 " with non-zero pending accepts=%u\n",
1285 listener, atomic_read(&listener->pend_accepts_cnt));
1286 }
1287
1288 return ret;
1289 }
1290
1291
1292 /**
1293 * mini_cm_del_listen
1294 */
1295 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1296 struct nes_cm_listener *listener)
1297 {
1298 listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1299 listener->cm_id = NULL; /* going to be destroyed pretty soon */
1300 return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1301 }
1302
1303
1304 /**
1305 * mini_cm_accelerated
1306 */
1307 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1308 struct nes_cm_node *cm_node)
1309 {
1310 u32 was_timer_set;
1311
1312 cm_node->accelerated = 1;
1313
1314 if (cm_node->accept_pend) {
1315 BUG_ON(!cm_node->listener);
1316 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1317 cm_node->accept_pend = 0;
1318 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1319 }
1320
1321 was_timer_set = timer_pending(&cm_core->tcp_timer);
1322 if (!was_timer_set) {
1323 cm_core->tcp_timer.expires = jiffies + NES_SHORT_TIME;
1324 add_timer(&cm_core->tcp_timer);
1325 }
1326
1327 return 0;
1328 }
1329
1330
1331 /**
1332 * nes_addr_resolve_neigh
1333 */
1334 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1335 {
1336 struct rtable *rt;
1337 struct neighbour *neigh;
1338 int rc = arpindex;
1339 struct net_device *netdev;
1340 struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1341
1342 rt = ip_route_output(&init_net, htonl(dst_ip), 0, 0, 0);
1343 if (IS_ERR(rt)) {
1344 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1345 __func__, dst_ip);
1346 return rc;
1347 }
1348
1349 if (netif_is_bond_slave(nesvnic->netdev))
1350 netdev = nesvnic->netdev->master;
1351 else
1352 netdev = nesvnic->netdev;
1353
1354 rcu_read_lock();
1355 neigh = dst_get_neighbour_noref(&rt->dst);
1356 if (neigh) {
1357 if (neigh->nud_state & NUD_VALID) {
1358 nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1359 " is %pM, Gateway is 0x%08X \n", dst_ip,
1360 neigh->ha, ntohl(rt->rt_gateway));
1361
1362 if (arpindex >= 0) {
1363 if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
1364 neigh->ha, ETH_ALEN)) {
1365 /* Mac address same as in nes_arp_table */
1366 goto out;
1367 }
1368
1369 nes_manage_arp_cache(nesvnic->netdev,
1370 nesadapter->arp_table[arpindex].mac_addr,
1371 dst_ip, NES_ARP_DELETE);
1372 }
1373
1374 nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1375 dst_ip, NES_ARP_ADD);
1376 rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1377 NES_ARP_RESOLVE);
1378 } else {
1379 neigh_event_send(neigh, NULL);
1380 }
1381 }
1382
1383 out:
1384 rcu_read_unlock();
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 del_timer(&nesqp->terminate_timer);
2842 if (nesqp->flush_issued == 0) {
2843 nesqp->flush_issued = 1;
2844 issue_flush = 1;
2845 }
2846 } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2847 ((original_ibqp_state == IB_QPS_RTS) &&
2848 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2849 issue_disconn = 1;
2850 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2851 disconn_status = -ECONNRESET;
2852 }
2853
2854 if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2855 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2856 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2857 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2858 issue_close = 1;
2859 nesqp->cm_id = NULL;
2860 if (nesqp->flush_issued == 0) {
2861 nesqp->flush_issued = 1;
2862 issue_flush = 1;
2863 }
2864 }
2865
2866 spin_unlock_irqrestore(&nesqp->lock, flags);
2867
2868 if ((issue_flush) && (nesqp->destroyed == 0)) {
2869 /* Flush the queue(s) */
2870 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2871 flush_q |= NES_CQP_FLUSH_SQ;
2872 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2873
2874 if (nesqp->term_flags) {
2875 ibevent.device = nesqp->ibqp.device;
2876 ibevent.event = nesqp->terminate_eventtype;
2877 ibevent.element.qp = &nesqp->ibqp;
2878 nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2879 }
2880 }
2881
2882 if ((cm_id) && (cm_id->event_handler)) {
2883 if (issue_disconn) {
2884 atomic_inc(&cm_disconnects);
2885 cm_event.event = IW_CM_EVENT_DISCONNECT;
2886 cm_event.status = disconn_status;
2887 cm_event.local_addr = cm_id->local_addr;
2888 cm_event.remote_addr = cm_id->remote_addr;
2889 cm_event.private_data = NULL;
2890 cm_event.private_data_len = 0;
2891
2892 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2893 " for QP%u, SQ Head = %u, SQ Tail = %u. "
2894 "cm_id = %p, refcount = %u.\n",
2895 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2896 nesqp->hwqp.sq_tail, cm_id,
2897 atomic_read(&nesqp->refcount));
2898
2899 ret = cm_id->event_handler(cm_id, &cm_event);
2900 if (ret)
2901 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2902 "returned, ret=%d\n", ret);
2903 }
2904
2905 if (issue_close) {
2906 atomic_inc(&cm_closes);
2907 nes_disconnect(nesqp, 1);
2908
2909 cm_id->provider_data = nesqp;
2910 /* Send up the close complete event */
2911 cm_event.event = IW_CM_EVENT_CLOSE;
2912 cm_event.status = 0;
2913 cm_event.provider_data = cm_id->provider_data;
2914 cm_event.local_addr = cm_id->local_addr;
2915 cm_event.remote_addr = cm_id->remote_addr;
2916 cm_event.private_data = NULL;
2917 cm_event.private_data_len = 0;
2918
2919 ret = cm_id->event_handler(cm_id, &cm_event);
2920 if (ret)
2921 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2922
2923 cm_id->rem_ref(cm_id);
2924 }
2925 }
2926
2927 return 0;
2928 }
2929
2930
2931 /**
2932 * nes_disconnect
2933 */
2934 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
2935 {
2936 int ret = 0;
2937 struct nes_vnic *nesvnic;
2938 struct nes_device *nesdev;
2939 struct nes_ib_device *nesibdev;
2940
2941 nesvnic = to_nesvnic(nesqp->ibqp.device);
2942 if (!nesvnic)
2943 return -EINVAL;
2944
2945 nesdev = nesvnic->nesdev;
2946 nesibdev = nesvnic->nesibdev;
2947
2948 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
2949 netdev_refcnt_read(nesvnic->netdev));
2950
2951 if (nesqp->active_conn) {
2952
2953 /* indicate this connection is NOT active */
2954 nesqp->active_conn = 0;
2955 } else {
2956 /* Need to free the Last Streaming Mode Message */
2957 if (nesqp->ietf_frame) {
2958 if (nesqp->lsmm_mr)
2959 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
2960 pci_free_consistent(nesdev->pcidev,
2961 nesqp->private_data_len + nesqp->ietf_frame_size,
2962 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
2963 }
2964 }
2965
2966 /* close the CM node down if it is still active */
2967 if (nesqp->cm_node) {
2968 nes_debug(NES_DBG_CM, "Call close API\n");
2969
2970 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
2971 }
2972
2973 return ret;
2974 }
2975
2976
2977 /**
2978 * nes_accept
2979 */
2980 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
2981 {
2982 u64 u64temp;
2983 struct ib_qp *ibqp;
2984 struct nes_qp *nesqp;
2985 struct nes_vnic *nesvnic;
2986 struct nes_device *nesdev;
2987 struct nes_cm_node *cm_node;
2988 struct nes_adapter *adapter;
2989 struct ib_qp_attr attr;
2990 struct iw_cm_event cm_event;
2991 struct nes_hw_qp_wqe *wqe;
2992 struct nes_v4_quad nes_quad;
2993 u32 crc_value;
2994 int ret;
2995 int passive_state;
2996 struct nes_ib_device *nesibdev;
2997 struct ib_mr *ibmr = NULL;
2998 struct ib_phys_buf ibphysbuf;
2999 struct nes_pd *nespd;
3000 u64 tagged_offset;
3001 u8 mpa_frame_offset = 0;
3002 struct ietf_mpa_v2 *mpa_v2_frame;
3003 u8 start_addr = 0;
3004 u8 *start_ptr = &start_addr;
3005 u8 **start_buff = &start_ptr;
3006 u16 buff_len = 0;
3007
3008 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3009 if (!ibqp)
3010 return -EINVAL;
3011
3012 /* get all our handles */
3013 nesqp = to_nesqp(ibqp);
3014 nesvnic = to_nesvnic(nesqp->ibqp.device);
3015 nesdev = nesvnic->nesdev;
3016 adapter = nesdev->nesadapter;
3017
3018 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3019 nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3020 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3021 nesvnic->netdev->name);
3022
3023 if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3024 if (cm_node->loopbackpartner)
3025 rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3026 rem_ref_cm_node(cm_node->cm_core, cm_node);
3027 return -EINVAL;
3028 }
3029
3030 passive_state = atomic_add_return(1, &cm_node->passive_state);
3031 if (passive_state == NES_SEND_RESET_EVENT) {
3032 rem_ref_cm_node(cm_node->cm_core, cm_node);
3033 return -ECONNRESET;
3034 }
3035
3036 /* associate the node with the QP */
3037 nesqp->cm_node = (void *)cm_node;
3038 cm_node->nesqp = nesqp;
3039
3040 nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3041 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3042 atomic_inc(&cm_accepts);
3043
3044 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3045 netdev_refcnt_read(nesvnic->netdev));
3046
3047 nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3048 /* allocate the ietf frame and space for private data */
3049 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3050 nesqp->ietf_frame_size + conn_param->private_data_len,
3051 &nesqp->ietf_frame_pbase);
3052
3053 if (!nesqp->ietf_frame) {
3054 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3055 return -ENOMEM;
3056 }
3057 mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3058
3059 if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3060 mpa_frame_offset = 4;
3061
3062 memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3063 conn_param->private_data_len);
3064
3065 cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3066 nesqp->private_data_len = conn_param->private_data_len;
3067
3068 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3069 wqe = &nesqp->hwqp.sq_vbase[0];
3070
3071 if (cm_id->remote_addr.sin_addr.s_addr !=
3072 cm_id->local_addr.sin_addr.s_addr) {
3073 u64temp = (unsigned long)nesqp;
3074 nesibdev = nesvnic->nesibdev;
3075 nespd = nesqp->nespd;
3076 ibphysbuf.addr = nesqp->ietf_frame_pbase + mpa_frame_offset;
3077 ibphysbuf.size = buff_len;
3078 tagged_offset = (u64)(unsigned long)*start_buff;
3079 ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
3080 &ibphysbuf, 1,
3081 IB_ACCESS_LOCAL_WRITE,
3082 &tagged_offset);
3083 if (!ibmr) {
3084 nes_debug(NES_DBG_CM, "Unable to register memory region"
3085 "for lSMM for cm_node = %p \n",
3086 cm_node);
3087 pci_free_consistent(nesdev->pcidev,
3088 nesqp->private_data_len + nesqp->ietf_frame_size,
3089 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3090 return -ENOMEM;
3091 }
3092
3093 ibmr->pd = &nespd->ibpd;
3094 ibmr->device = nespd->ibpd.device;
3095 nesqp->lsmm_mr = ibmr;
3096
3097 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3098 set_wqe_64bit_value(wqe->wqe_words,
3099 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3100 u64temp);
3101 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3102 cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3103 NES_IWARP_SQ_WQE_WRPDU);
3104 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3105 cpu_to_le32(buff_len);
3106 set_wqe_64bit_value(wqe->wqe_words,
3107 NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3108 (u64)(unsigned long)(*start_buff));
3109 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3110 cpu_to_le32(buff_len);
3111 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3112 if (nesqp->sq_kmapped) {
3113 nesqp->sq_kmapped = 0;
3114 kunmap(nesqp->page);
3115 }
3116
3117 nesqp->nesqp_context->ird_ord_sizes |=
3118 cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3119 NES_QPCONTEXT_ORDIRD_WRPDU);
3120 } else {
3121 nesqp->nesqp_context->ird_ord_sizes |=
3122 cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3123 }
3124 nesqp->skip_lsmm = 1;
3125
3126
3127 /* Cache the cm_id in the qp */
3128 nesqp->cm_id = cm_id;
3129 cm_node->cm_id = cm_id;
3130
3131 /* nesqp->cm_node = (void *)cm_id->provider_data; */
3132 cm_id->provider_data = nesqp;
3133 nesqp->active_conn = 0;
3134
3135 if (cm_node->state == NES_CM_STATE_TSA)
3136 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3137 cm_node);
3138
3139 nes_cm_init_tsa_conn(nesqp, cm_node);
3140
3141 nesqp->nesqp_context->tcpPorts[0] =
3142 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3143 nesqp->nesqp_context->tcpPorts[1] =
3144 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3145
3146 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3147 nesqp->nesqp_context->ip0 =
3148 cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3149 else
3150 nesqp->nesqp_context->ip0 =
3151 cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3152
3153 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3154 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3155 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3156
3157 nesqp->nesqp_context->arp_index_vlan |=
3158 cpu_to_le32(nes_arp_table(nesdev,
3159 le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3160 NES_ARP_RESOLVE) << 16);
3161
3162 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3163 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3164
3165 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3166
3167 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3168 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3169 nesqp->nesqp_context->ird_ord_sizes |=
3170 cpu_to_le32((u32)conn_param->ord);
3171
3172 memset(&nes_quad, 0, sizeof(nes_quad));
3173 nes_quad.DstIpAdrIndex =
3174 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3175 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3176 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3177 else
3178 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3179 nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3180 nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3181
3182 /* Produce hash key */
3183 crc_value = get_crc_value(&nes_quad);
3184 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3185 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3186 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3187
3188 nesqp->hte_index &= adapter->hte_index_mask;
3189 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3190
3191 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3192
3193 nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3194 "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3195 "private data length=%u.\n", nesqp->hwqp.qp_id,
3196 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3197 ntohs(cm_id->remote_addr.sin_port),
3198 ntohl(cm_id->local_addr.sin_addr.s_addr),
3199 ntohs(cm_id->local_addr.sin_port),
3200 le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3201 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3202 buff_len);
3203
3204 /* notify OF layer that accept event was successful */
3205 cm_id->add_ref(cm_id);
3206 nes_add_ref(&nesqp->ibqp);
3207
3208 cm_event.event = IW_CM_EVENT_ESTABLISHED;
3209 cm_event.status = 0;
3210 cm_event.provider_data = (void *)nesqp;
3211 cm_event.local_addr = cm_id->local_addr;
3212 cm_event.remote_addr = cm_id->remote_addr;
3213 cm_event.private_data = NULL;
3214 cm_event.private_data_len = 0;
3215 ret = cm_id->event_handler(cm_id, &cm_event);
3216 attr.qp_state = IB_QPS_RTS;
3217 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3218 if (cm_node->loopbackpartner) {
3219 cm_node->loopbackpartner->mpa_frame_size =
3220 nesqp->private_data_len;
3221 /* copy entire MPA frame to our cm_node's frame */
3222 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3223 conn_param->private_data, conn_param->private_data_len);
3224 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3225 }
3226 if (ret)
3227 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3228 "ret=%d\n", __func__, __LINE__, ret);
3229
3230 return 0;
3231 }
3232
3233
3234 /**
3235 * nes_reject
3236 */
3237 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3238 {
3239 struct nes_cm_node *cm_node;
3240 struct nes_cm_node *loopback;
3241 struct nes_cm_core *cm_core;
3242 u8 *start_buff;
3243
3244 atomic_inc(&cm_rejects);
3245 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3246 loopback = cm_node->loopbackpartner;
3247 cm_core = cm_node->cm_core;
3248 cm_node->cm_id = cm_id;
3249
3250 if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3251 return -EINVAL;
3252
3253 if (loopback) {
3254 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3255 loopback->mpa_frame.priv_data_len = pdata_len;
3256 loopback->mpa_frame_size = pdata_len;
3257 } else {
3258 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3259 cm_node->mpa_frame_size = pdata_len;
3260 memcpy(start_buff, pdata, pdata_len);
3261 }
3262 return cm_core->api->reject(cm_core, cm_node);
3263 }
3264
3265
3266 /**
3267 * nes_connect
3268 * setup and launch cm connect node
3269 */
3270 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3271 {
3272 struct ib_qp *ibqp;
3273 struct nes_qp *nesqp;
3274 struct nes_vnic *nesvnic;
3275 struct nes_device *nesdev;
3276 struct nes_cm_node *cm_node;
3277 struct nes_cm_info cm_info;
3278 int apbvt_set = 0;
3279
3280 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3281 if (!ibqp)
3282 return -EINVAL;
3283 nesqp = to_nesqp(ibqp);
3284 if (!nesqp)
3285 return -EINVAL;
3286 nesvnic = to_nesvnic(nesqp->ibqp.device);
3287 if (!nesvnic)
3288 return -EINVAL;
3289 nesdev = nesvnic->nesdev;
3290 if (!nesdev)
3291 return -EINVAL;
3292
3293 if (!(cm_id->local_addr.sin_port) || !(cm_id->remote_addr.sin_port))
3294 return -EINVAL;
3295
3296 nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3297 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3298 ntohl(nesvnic->local_ipaddr),
3299 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3300 ntohs(cm_id->remote_addr.sin_port),
3301 ntohl(cm_id->local_addr.sin_addr.s_addr),
3302 ntohs(cm_id->local_addr.sin_port));
3303
3304 atomic_inc(&cm_connects);
3305 nesqp->active_conn = 1;
3306
3307 /* cache the cm_id in the qp */
3308 nesqp->cm_id = cm_id;
3309
3310 cm_id->provider_data = nesqp;
3311
3312 nesqp->private_data_len = conn_param->private_data_len;
3313 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32((u32)conn_param->ord);
3314 nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3315 nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3316 conn_param->private_data_len);
3317
3318 if (cm_id->local_addr.sin_addr.s_addr !=
3319 cm_id->remote_addr.sin_addr.s_addr) {
3320 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3321 PCI_FUNC(nesdev->pcidev->devfn), NES_MANAGE_APBVT_ADD);
3322 apbvt_set = 1;
3323 }
3324
3325 /* set up the connection params for the node */
3326 cm_info.loc_addr = htonl(cm_id->local_addr.sin_addr.s_addr);
3327 cm_info.loc_port = htons(cm_id->local_addr.sin_port);
3328 cm_info.rem_addr = htonl(cm_id->remote_addr.sin_addr.s_addr);
3329 cm_info.rem_port = htons(cm_id->remote_addr.sin_port);
3330 cm_info.cm_id = cm_id;
3331 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3332
3333 cm_id->add_ref(cm_id);
3334
3335 /* create a connect CM node connection */
3336 cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3337 conn_param->private_data_len, (void *)conn_param->private_data,
3338 &cm_info);
3339 if (!cm_node) {
3340 if (apbvt_set)
3341 nes_manage_apbvt(nesvnic, ntohs(cm_id->local_addr.sin_port),
3342 PCI_FUNC(nesdev->pcidev->devfn),
3343 NES_MANAGE_APBVT_DEL);
3344
3345 cm_id->rem_ref(cm_id);
3346 return -ENOMEM;
3347 }
3348
3349 cm_node->apbvt_set = apbvt_set;
3350 nesqp->cm_node = cm_node;
3351 cm_node->nesqp = nesqp;
3352 nes_add_ref(&nesqp->ibqp);
3353
3354 return 0;
3355 }
3356
3357
3358 /**
3359 * nes_create_listen
3360 */
3361 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3362 {
3363 struct nes_vnic *nesvnic;
3364 struct nes_cm_listener *cm_node;
3365 struct nes_cm_info cm_info;
3366 int err;
3367
3368 nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3369 cm_id, ntohs(cm_id->local_addr.sin_port));
3370
3371 nesvnic = to_nesvnic(cm_id->device);
3372 if (!nesvnic)
3373 return -EINVAL;
3374
3375 nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3376 nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3377
3378 nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3379 nesvnic->local_ipaddr, cm_id->local_addr.sin_addr.s_addr);
3380
3381 /* setup listen params in our api call struct */
3382 cm_info.loc_addr = nesvnic->local_ipaddr;
3383 cm_info.loc_port = cm_id->local_addr.sin_port;
3384 cm_info.backlog = backlog;
3385 cm_info.cm_id = cm_id;
3386
3387 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3388
3389
3390 cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3391 if (!cm_node) {
3392 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3393 __func__, __LINE__);
3394 return -ENOMEM;
3395 }
3396
3397 cm_id->provider_data = cm_node;
3398
3399 if (!cm_node->reused_node) {
3400 err = nes_manage_apbvt(nesvnic,
3401 ntohs(cm_id->local_addr.sin_port),
3402 PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3403 NES_MANAGE_APBVT_ADD);
3404 if (err) {
3405 printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3406 err);
3407 g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3408 return err;
3409 }
3410 atomic_inc(&cm_listens_created);
3411 }
3412
3413 cm_id->add_ref(cm_id);
3414 cm_id->provider_data = (void *)cm_node;
3415
3416
3417 return 0;
3418 }
3419
3420
3421 /**
3422 * nes_destroy_listen
3423 */
3424 int nes_destroy_listen(struct iw_cm_id *cm_id)
3425 {
3426 if (cm_id->provider_data)
3427 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3428 else
3429 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3430
3431 cm_id->rem_ref(cm_id);
3432
3433 return 0;
3434 }
3435
3436
3437 /**
3438 * nes_cm_recv
3439 */
3440 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3441 {
3442 int rc = 0;
3443
3444 cm_packets_received++;
3445 if ((g_cm_core) && (g_cm_core->api))
3446 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3447 else
3448 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3449 " cm is not setup properly.\n");
3450
3451 return rc;
3452 }
3453
3454
3455 /**
3456 * nes_cm_start
3457 * Start and init a cm core module
3458 */
3459 int nes_cm_start(void)
3460 {
3461 nes_debug(NES_DBG_CM, "\n");
3462 /* create the primary CM core, pass this handle to subsequent core inits */
3463 g_cm_core = nes_cm_alloc_core();
3464 if (g_cm_core)
3465 return 0;
3466 else
3467 return -ENOMEM;
3468 }
3469
3470
3471 /**
3472 * nes_cm_stop
3473 * stop and dealloc all cm core instances
3474 */
3475 int nes_cm_stop(void)
3476 {
3477 g_cm_core->api->destroy_cm_core(g_cm_core);
3478 return 0;
3479 }
3480
3481
3482 /**
3483 * cm_event_connected
3484 * handle a connected event, setup QPs and HW
3485 */
3486 static void cm_event_connected(struct nes_cm_event *event)
3487 {
3488 struct nes_qp *nesqp;
3489 struct nes_vnic *nesvnic;
3490 struct nes_device *nesdev;
3491 struct nes_cm_node *cm_node;
3492 struct nes_adapter *nesadapter;
3493 struct ib_qp_attr attr;
3494 struct iw_cm_id *cm_id;
3495 struct iw_cm_event cm_event;
3496 struct nes_v4_quad nes_quad;
3497 u32 crc_value;
3498 int ret;
3499
3500 /* get all our handles */
3501 cm_node = event->cm_node;
3502 cm_id = cm_node->cm_id;
3503 nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3504 nesqp = (struct nes_qp *)cm_id->provider_data;
3505 nesvnic = to_nesvnic(nesqp->ibqp.device);
3506 nesdev = nesvnic->nesdev;
3507 nesadapter = nesdev->nesadapter;
3508
3509 if (nesqp->destroyed)
3510 return;
3511 atomic_inc(&cm_connecteds);
3512 nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
3513 " local port 0x%04X. jiffies = %lu.\n",
3514 nesqp->hwqp.qp_id,
3515 ntohl(cm_id->remote_addr.sin_addr.s_addr),
3516 ntohs(cm_id->remote_addr.sin_port),
3517 ntohs(cm_id->local_addr.sin_port),
3518 jiffies);
3519
3520 nes_cm_init_tsa_conn(nesqp, cm_node);
3521
3522 /* set the QP tsa context */
3523 nesqp->nesqp_context->tcpPorts[0] =
3524 cpu_to_le16(ntohs(cm_id->local_addr.sin_port));
3525 nesqp->nesqp_context->tcpPorts[1] =
3526 cpu_to_le16(ntohs(cm_id->remote_addr.sin_port));
3527 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3528 nesqp->nesqp_context->ip0 =
3529 cpu_to_le32(ntohl(nesvnic->local_ipaddr));
3530 else
3531 nesqp->nesqp_context->ip0 =
3532 cpu_to_le32(ntohl(cm_id->remote_addr.sin_addr.s_addr));
3533
3534 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3535 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3536 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3537 nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3538 nes_arp_table(nesdev,
3539 le32_to_cpu(nesqp->nesqp_context->ip0),
3540 NULL, NES_ARP_RESOLVE) << 16);
3541 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3542 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3543 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3544 nesqp->nesqp_context->ird_ord_sizes |=
3545 cpu_to_le32((u32)1 <<
3546 NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3547
3548 /* Adjust tail for not having a LSMM */
3549 /*nesqp->hwqp.sq_tail = 1;*/
3550
3551 build_rdma0_msg(cm_node, &nesqp);
3552
3553 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3554 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3555
3556 memset(&nes_quad, 0, sizeof(nes_quad));
3557
3558 nes_quad.DstIpAdrIndex =
3559 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3560 if (ipv4_is_loopback(cm_id->remote_addr.sin_addr.s_addr))
3561 nes_quad.SrcIpadr = nesvnic->local_ipaddr;
3562 else
3563 nes_quad.SrcIpadr = cm_id->remote_addr.sin_addr.s_addr;
3564 nes_quad.TcpPorts[0] = cm_id->remote_addr.sin_port;
3565 nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
3566
3567 /* Produce hash key */
3568 crc_value = get_crc_value(&nes_quad);
3569 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3570 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3571 nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3572
3573 nesqp->hte_index &= nesadapter->hte_index_mask;
3574 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3575
3576 nesqp->ietf_frame = &cm_node->mpa_frame;
3577 nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3578 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3579
3580 /* notify OF layer we successfully created the requested connection */
3581 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3582 cm_event.status = 0;
3583 cm_event.provider_data = cm_id->provider_data;
3584 cm_event.local_addr.sin_family = AF_INET;
3585 cm_event.local_addr.sin_port = cm_id->local_addr.sin_port;
3586 cm_event.remote_addr = cm_id->remote_addr;
3587
3588 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3589 cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3590 cm_event.ird = cm_node->ird_size;
3591 cm_event.ord = cm_node->ord_size;
3592
3593 cm_event.local_addr.sin_addr.s_addr = event->cm_info.rem_addr;
3594 ret = cm_id->event_handler(cm_id, &cm_event);
3595 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3596
3597 if (ret)
3598 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3599 "ret=%d\n", __func__, __LINE__, ret);
3600 attr.qp_state = IB_QPS_RTS;
3601 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3602
3603 nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3604 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3605
3606 return;
3607 }
3608
3609
3610 /**
3611 * cm_event_connect_error
3612 */
3613 static void cm_event_connect_error(struct nes_cm_event *event)
3614 {
3615 struct nes_qp *nesqp;
3616 struct iw_cm_id *cm_id;
3617 struct iw_cm_event cm_event;
3618 /* struct nes_cm_info cm_info; */
3619 int ret;
3620
3621 if (!event->cm_node)
3622 return;
3623
3624 cm_id = event->cm_node->cm_id;
3625 if (!cm_id)
3626 return;
3627
3628 nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3629 nesqp = cm_id->provider_data;
3630
3631 if (!nesqp)
3632 return;
3633
3634 /* notify OF layer about this connection error event */
3635 /* cm_id->rem_ref(cm_id); */
3636 nesqp->cm_id = NULL;
3637 cm_id->provider_data = NULL;
3638 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3639 cm_event.status = -ECONNRESET;
3640 cm_event.provider_data = cm_id->provider_data;
3641 cm_event.local_addr = cm_id->local_addr;
3642 cm_event.remote_addr = cm_id->remote_addr;
3643 cm_event.private_data = NULL;
3644 cm_event.private_data_len = 0;
3645
3646 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, "
3647 "remove_addr=%08x\n", cm_event.local_addr.sin_addr.s_addr,
3648 cm_event.remote_addr.sin_addr.s_addr);
3649
3650 ret = cm_id->event_handler(cm_id, &cm_event);
3651 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3652 if (ret)
3653 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3654 "ret=%d\n", __func__, __LINE__, ret);
3655 cm_id->rem_ref(cm_id);
3656
3657 rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3658 return;
3659 }
3660
3661
3662 /**
3663 * cm_event_reset
3664 */
3665 static void cm_event_reset(struct nes_cm_event *event)
3666 {
3667 struct nes_qp *nesqp;
3668 struct iw_cm_id *cm_id;
3669 struct iw_cm_event cm_event;
3670 /* struct nes_cm_info cm_info; */
3671 int ret;
3672
3673 if (!event->cm_node)
3674 return;
3675
3676 if (!event->cm_node->cm_id)
3677 return;
3678
3679 cm_id = event->cm_node->cm_id;
3680
3681 nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3682 nesqp = cm_id->provider_data;
3683 if (!nesqp)
3684 return;
3685
3686 nesqp->cm_id = NULL;
3687 /* cm_id->provider_data = NULL; */
3688 cm_event.event = IW_CM_EVENT_DISCONNECT;
3689 cm_event.status = -ECONNRESET;
3690 cm_event.provider_data = cm_id->provider_data;
3691 cm_event.local_addr = cm_id->local_addr;
3692 cm_event.remote_addr = cm_id->remote_addr;
3693 cm_event.private_data = NULL;
3694 cm_event.private_data_len = 0;
3695
3696 cm_id->add_ref(cm_id);
3697 ret = cm_id->event_handler(cm_id, &cm_event);
3698 atomic_inc(&cm_closes);
3699 cm_event.event = IW_CM_EVENT_CLOSE;
3700 cm_event.status = 0;
3701 cm_event.provider_data = cm_id->provider_data;
3702 cm_event.local_addr = cm_id->local_addr;
3703 cm_event.remote_addr = cm_id->remote_addr;
3704 cm_event.private_data = NULL;
3705 cm_event.private_data_len = 0;
3706 nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3707 ret = cm_id->event_handler(cm_id, &cm_event);
3708
3709 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3710
3711
3712 /* notify OF layer about this connection error event */
3713 cm_id->rem_ref(cm_id);
3714
3715 return;
3716 }
3717
3718
3719 /**
3720 * cm_event_mpa_req
3721 */
3722 static void cm_event_mpa_req(struct nes_cm_event *event)
3723 {
3724 struct iw_cm_id *cm_id;
3725 struct iw_cm_event cm_event;
3726 int ret;
3727 struct nes_cm_node *cm_node;
3728
3729 cm_node = event->cm_node;
3730 if (!cm_node)
3731 return;
3732 cm_id = cm_node->cm_id;
3733
3734 atomic_inc(&cm_connect_reqs);
3735 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3736 cm_node, cm_id, jiffies);
3737
3738 cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3739 cm_event.status = 0;
3740 cm_event.provider_data = (void *)cm_node;
3741
3742 cm_event.local_addr.sin_family = AF_INET;
3743 cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3744 cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3745
3746 cm_event.remote_addr.sin_family = AF_INET;
3747 cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3748 cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3749 cm_event.private_data = cm_node->mpa_frame_buf;
3750 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3751 cm_event.ird = cm_node->ird_size;
3752 cm_event.ord = cm_node->ord_size;
3753
3754 ret = cm_id->event_handler(cm_id, &cm_event);
3755 if (ret)
3756 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3757 __func__, __LINE__, ret);
3758 return;
3759 }
3760
3761
3762 static void cm_event_mpa_reject(struct nes_cm_event *event)
3763 {
3764 struct iw_cm_id *cm_id;
3765 struct iw_cm_event cm_event;
3766 struct nes_cm_node *cm_node;
3767 int ret;
3768
3769 cm_node = event->cm_node;
3770 if (!cm_node)
3771 return;
3772 cm_id = cm_node->cm_id;
3773
3774 atomic_inc(&cm_connect_reqs);
3775 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3776 cm_node, cm_id, jiffies);
3777
3778 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3779 cm_event.status = -ECONNREFUSED;
3780 cm_event.provider_data = cm_id->provider_data;
3781
3782 cm_event.local_addr.sin_family = AF_INET;
3783 cm_event.local_addr.sin_port = htons(event->cm_info.loc_port);
3784 cm_event.local_addr.sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3785
3786 cm_event.remote_addr.sin_family = AF_INET;
3787 cm_event.remote_addr.sin_port = htons(event->cm_info.rem_port);
3788 cm_event.remote_addr.sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3789
3790 cm_event.private_data = cm_node->mpa_frame_buf;
3791 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3792
3793 nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3794 "remove_addr=%08x\n",
3795 cm_event.local_addr.sin_addr.s_addr,
3796 cm_event.remote_addr.sin_addr.s_addr);
3797
3798 ret = cm_id->event_handler(cm_id, &cm_event);
3799 if (ret)
3800 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3801 __func__, __LINE__, ret);
3802
3803 return;
3804 }
3805
3806
3807 static void nes_cm_event_handler(struct work_struct *);
3808
3809 /**
3810 * nes_cm_post_event
3811 * post an event to the cm event handler
3812 */
3813 static int nes_cm_post_event(struct nes_cm_event *event)
3814 {
3815 atomic_inc(&event->cm_node->cm_core->events_posted);
3816 add_ref_cm_node(event->cm_node);
3817 event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3818 INIT_WORK(&event->event_work, nes_cm_event_handler);
3819 nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3820 event->cm_node, event);
3821
3822 queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3823
3824 nes_debug(NES_DBG_CM, "Exit\n");
3825 return 0;
3826 }
3827
3828
3829 /**
3830 * nes_cm_event_handler
3831 * worker function to handle cm events
3832 * will free instance of nes_cm_event
3833 */
3834 static void nes_cm_event_handler(struct work_struct *work)
3835 {
3836 struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3837 event_work);
3838 struct nes_cm_core *cm_core;
3839
3840 if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3841 return;
3842
3843 cm_core = event->cm_node->cm_core;
3844 nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3845 event, event->type, atomic_read(&cm_core->events_posted));
3846
3847 switch (event->type) {
3848 case NES_CM_EVENT_MPA_REQ:
3849 cm_event_mpa_req(event);
3850 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3851 event->cm_node);
3852 break;
3853 case NES_CM_EVENT_RESET:
3854 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3855 event->cm_node);
3856 cm_event_reset(event);
3857 break;
3858 case NES_CM_EVENT_CONNECTED:
3859 if ((!event->cm_node->cm_id) ||
3860 (event->cm_node->state != NES_CM_STATE_TSA))
3861 break;
3862 cm_event_connected(event);
3863 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3864 break;
3865 case NES_CM_EVENT_MPA_REJECT:
3866 if ((!event->cm_node->cm_id) ||
3867 (event->cm_node->state == NES_CM_STATE_TSA))
3868 break;
3869 cm_event_mpa_reject(event);
3870 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3871 break;
3872
3873 case NES_CM_EVENT_ABORTED:
3874 if ((!event->cm_node->cm_id) ||
3875 (event->cm_node->state == NES_CM_STATE_TSA))
3876 break;
3877 cm_event_connect_error(event);
3878 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3879 break;
3880 case NES_CM_EVENT_DROPPED_PKT:
3881 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3882 break;
3883 default:
3884 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3885 break;
3886 }
3887
3888 atomic_dec(&cm_core->events_posted);
3889 event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3890 rem_ref_cm_node(cm_core, event->cm_node);
3891 kfree(event);
3892
3893 return;
3894 }