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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / infiniband / hw / nes / nes_cm.c
blob6cdfbf8c5674f55af43b6e22dd50b7065bc28858
1 /*
2 * Copyright (c) 2006 - 2014 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34
35 #define TCPOPT_TIMESTAMP 8
36
37 #include <linux/atomic.h>
38 #include <linux/skbuff.h>
39 #include <linux/ip.h>
40 #include <linux/tcp.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/if_vlan.h>
44 #include <linux/notifier.h>
45 #include <linux/net.h>
46 #include <linux/types.h>
47 #include <linux/timer.h>
48 #include <linux/time.h>
49 #include <linux/delay.h>
50 #include <linux/etherdevice.h>
51 #include <linux/netdevice.h>
52 #include <linux/random.h>
53 #include <linux/list.h>
54 #include <linux/threads.h>
55 #include <linux/highmem.h>
56 #include <linux/slab.h>
57 #include <net/arp.h>
58 #include <net/neighbour.h>
59 #include <net/route.h>
60 #include <net/ip_fib.h>
61 #include <net/tcp.h>
62 #include <linux/fcntl.h>
63
64 #include "nes.h"
65
66 u32 cm_packets_sent;
67 u32 cm_packets_bounced;
68 u32 cm_packets_dropped;
69 u32 cm_packets_retrans;
70 u32 cm_packets_created;
71 u32 cm_packets_received;
72 atomic_t cm_listens_created;
73 atomic_t cm_listens_destroyed;
74 u32 cm_backlog_drops;
75 atomic_t cm_loopbacks;
76 atomic_t cm_nodes_created;
77 atomic_t cm_nodes_destroyed;
78 atomic_t cm_accel_dropped_pkts;
79 atomic_t cm_resets_recvd;
80
81 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
82 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
83 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
84 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
85 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
86 static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
87 static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
88 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
89 static int mini_cm_dealloc_core(struct nes_cm_core *);
90 static int mini_cm_get(struct nes_cm_core *);
91 static int mini_cm_set(struct nes_cm_core *, u32, u32);
92
93 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
94 static int add_ref_cm_node(struct nes_cm_node *);
95 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
96
97 static int nes_cm_disconn_true(struct nes_qp *);
98 static int nes_cm_post_event(struct nes_cm_event *event);
99 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
100 static void nes_disconnect_worker(struct work_struct *work);
101
102 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
103 static int send_mpa_reject(struct nes_cm_node *);
104 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
105 static int send_reset(struct nes_cm_node *, struct sk_buff *);
106 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
107 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
108 static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
109
110 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
111 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
112 static void cleanup_retrans_entry(struct nes_cm_node *);
113 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
114 static void free_retrans_entry(struct nes_cm_node *cm_node);
115 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
116
117 /* CM event handler functions */
118 static void cm_event_connected(struct nes_cm_event *);
119 static void cm_event_connect_error(struct nes_cm_event *);
120 static void cm_event_reset(struct nes_cm_event *);
121 static void cm_event_mpa_req(struct nes_cm_event *);
122 static void cm_event_mpa_reject(struct nes_cm_event *);
123 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
124
125 /* MPA build functions */
126 static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
127 static void build_mpa_v2(struct nes_cm_node *, void *, u8);
128 static void build_mpa_v1(struct nes_cm_node *, void *, u8);
129 static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
130
131 static void print_core(struct nes_cm_core *core);
132 static void record_ird_ord(struct nes_cm_node *, u16, u16);
133
134 /* External CM API Interface */
135 /* instance of function pointers for client API */
136 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
137 static const struct nes_cm_ops nes_cm_api = {
138 .accelerated = mini_cm_accelerated,
139 .listen = mini_cm_listen,
140 .stop_listener = mini_cm_del_listen,
141 .connect = mini_cm_connect,
142 .close = mini_cm_close,
143 .accept = mini_cm_accept,
144 .reject = mini_cm_reject,
145 .recv_pkt = mini_cm_recv_pkt,
146 .destroy_cm_core = mini_cm_dealloc_core,
147 .get = mini_cm_get,
148 .set = mini_cm_set
149 };
150
151 static struct nes_cm_core *g_cm_core;
152
153 atomic_t cm_connects;
154 atomic_t cm_accepts;
155 atomic_t cm_disconnects;
156 atomic_t cm_closes;
157 atomic_t cm_connecteds;
158 atomic_t cm_connect_reqs;
159 atomic_t cm_rejects;
160
161 int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
162 {
163 return add_ref_cm_node(cm_node);
164 }
165
166 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
167 {
168 return rem_ref_cm_node(cm_node->cm_core, cm_node);
169 }
170 /**
171 * create_event
172 */
173 static struct nes_cm_event *create_event(struct nes_cm_node * cm_node,
174 enum nes_cm_event_type type)
175 {
176 struct nes_cm_event *event;
177
178 if (!cm_node->cm_id)
179 return NULL;
180
181 /* allocate an empty event */
182 event = kzalloc(sizeof(*event), GFP_ATOMIC);
183
184 if (!event)
185 return NULL;
186
187 event->type = type;
188 event->cm_node = cm_node;
189 event->cm_info.rem_addr = cm_node->rem_addr;
190 event->cm_info.loc_addr = cm_node->loc_addr;
191 event->cm_info.rem_port = cm_node->rem_port;
192 event->cm_info.loc_port = cm_node->loc_port;
193 event->cm_info.cm_id = cm_node->cm_id;
194
195 nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
196 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
197 cm_node, event, type, event->cm_info.loc_addr,
198 event->cm_info.loc_port, event->cm_info.rem_addr,
199 event->cm_info.rem_port);
200
201 nes_cm_post_event(event);
202 return event;
203 }
204
205
206 /**
207 * send_mpa_request
208 */
209 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
210 {
211 u8 start_addr = 0;
212 u8 *start_ptr = &start_addr;
213 u8 **start_buff = &start_ptr;
214 u16 buff_len = 0;
215
216 if (!skb) {
217 nes_debug(NES_DBG_CM, "skb set to NULL\n");
218 return -1;
219 }
220
221 /* send an MPA Request frame */
222 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
223 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
224
225 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
226 }
227
228
229
230 static int send_mpa_reject(struct nes_cm_node *cm_node)
231 {
232 struct sk_buff *skb = NULL;
233 u8 start_addr = 0;
234 u8 *start_ptr = &start_addr;
235 u8 **start_buff = &start_ptr;
236 u16 buff_len = 0;
237 struct ietf_mpa_v1 *mpa_frame;
238
239 skb = dev_alloc_skb(MAX_CM_BUFFER);
240 if (!skb) {
241 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
242 return -ENOMEM;
243 }
244
245 /* send an MPA reject frame */
246 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
247 mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
248 mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
249 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
250
251 cm_node->state = NES_CM_STATE_FIN_WAIT1;
252 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
253 }
254
255
256 /**
257 * recv_mpa - process a received TCP pkt, we are expecting an
258 * IETF MPA frame
259 */
260 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
261 u32 len)
262 {
263 struct ietf_mpa_v1 *mpa_frame;
264 struct ietf_mpa_v2 *mpa_v2_frame;
265 struct ietf_rtr_msg *rtr_msg;
266 int mpa_hdr_len;
267 int priv_data_len;
268
269 *type = NES_MPA_REQUEST_ACCEPT;
270
271 /* assume req frame is in tcp data payload */
272 if (len < sizeof(struct ietf_mpa_v1)) {
273 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
274 return -EINVAL;
275 }
276
277 /* points to the beginning of the frame, which could be MPA V1 or V2 */
278 mpa_frame = (struct ietf_mpa_v1 *)buffer;
279 mpa_hdr_len = sizeof(struct ietf_mpa_v1);
280 priv_data_len = ntohs(mpa_frame->priv_data_len);
281
282 /* make sure mpa private data len is less than 512 bytes */
283 if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
284 nes_debug(NES_DBG_CM, "The received Length of Private"
285 " Data field exceeds 512 octets\n");
286 return -EINVAL;
287 }
288 /*
289 * make sure MPA receiver interoperate with the
290 * received MPA version and MPA key information
291 *
292 */
293 if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
294 nes_debug(NES_DBG_CM, "The received mpa version"
295 " is not supported\n");
296 return -EINVAL;
297 }
298 /*
299 * backwards compatibility only
300 */
301 if (mpa_frame->rev > cm_node->mpa_frame_rev) {
302 nes_debug(NES_DBG_CM, "The received mpa version"
303 " can not be interoperated\n");
304 return -EINVAL;
305 } else {
306 cm_node->mpa_frame_rev = mpa_frame->rev;
307 }
308
309 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
310 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
311 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
312 return -EINVAL;
313 }
314 } else {
315 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
316 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
317 return -EINVAL;
318 }
319 }
320
321 if (priv_data_len + mpa_hdr_len != len) {
322 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
323 " complete (%x + %x != %x)\n",
324 priv_data_len, mpa_hdr_len, len);
325 return -EINVAL;
326 }
327 /* make sure it does not exceed the max size */
328 if (len > MAX_CM_BUFFER) {
329 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
330 " (%x + %x != %x)\n",
331 priv_data_len, mpa_hdr_len, len);
332 return -EINVAL;
333 }
334
335 cm_node->mpa_frame_size = priv_data_len;
336
337 switch (mpa_frame->rev) {
338 case IETF_MPA_V2: {
339 u16 ird_size;
340 u16 ord_size;
341 u16 rtr_ctrl_ird;
342 u16 rtr_ctrl_ord;
343
344 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
345 mpa_hdr_len += IETF_RTR_MSG_SIZE;
346 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
347 rtr_msg = &mpa_v2_frame->rtr_msg;
348
349 /* parse rtr message */
350 rtr_ctrl_ird = ntohs(rtr_msg->ctrl_ird);
351 rtr_ctrl_ord = ntohs(rtr_msg->ctrl_ord);
352 ird_size = rtr_ctrl_ird & IETF_NO_IRD_ORD;
353 ord_size = rtr_ctrl_ord & IETF_NO_IRD_ORD;
354
355 if (!(rtr_ctrl_ird & IETF_PEER_TO_PEER)) {
356 /* send reset */
357 return -EINVAL;
358 }
359 if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD)
360 cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
361
362 if (cm_node->mpav2_ird_ord != IETF_NO_IRD_ORD) {
363 /* responder */
364 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
365 /* we are still negotiating */
366 if (ord_size > NES_MAX_IRD) {
367 cm_node->ird_size = NES_MAX_IRD;
368 } else {
369 cm_node->ird_size = ord_size;
370 if (ord_size == 0 &&
371 (rtr_ctrl_ord & IETF_RDMA0_READ)) {
372 cm_node->ird_size = 1;
373 nes_debug(NES_DBG_CM,
374 "%s: Remote peer doesn't support RDMA0_READ (ord=%u)\n",
375 __func__, ord_size);
376 }
377 }
378 if (ird_size > NES_MAX_ORD)
379 cm_node->ord_size = NES_MAX_ORD;
380 else
381 cm_node->ord_size = ird_size;
382 } else { /* initiator */
383 if (ord_size > NES_MAX_IRD) {
384 nes_debug(NES_DBG_CM,
385 "%s: Unable to support the requested (ord =%u)\n",
386 __func__, ord_size);
387 return -EINVAL;
388 }
389 cm_node->ird_size = ord_size;
390
391 if (ird_size > NES_MAX_ORD) {
392 cm_node->ord_size = NES_MAX_ORD;
393 } else {
394 if (ird_size == 0 &&
395 (rtr_ctrl_ord & IETF_RDMA0_READ)) {
396 nes_debug(NES_DBG_CM,
397 "%s: Remote peer doesn't support RDMA0_READ (ird=%u)\n",
398 __func__, ird_size);
399 return -EINVAL;
400 } else {
401 cm_node->ord_size = ird_size;
402 }
403 }
404 }
405 }
406
407 if (rtr_ctrl_ord & IETF_RDMA0_READ) {
408 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
409
410 } else if (rtr_ctrl_ord & IETF_RDMA0_WRITE) {
411 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
412 } else { /* Not supported RDMA0 operation */
413 return -EINVAL;
414 }
415 break;
416 }
417 case IETF_MPA_V1:
418 default:
419 break;
420 }
421
422 /* copy entire MPA frame to our cm_node's frame */
423 memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
424
425 if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
426 *type = NES_MPA_REQUEST_REJECT;
427 return 0;
428 }
429
430
431 /**
432 * form_cm_frame - get a free packet and build empty frame Use
433 * node info to build.
434 */
435 static void form_cm_frame(struct sk_buff *skb,
436 struct nes_cm_node *cm_node, void *options, u32 optionsize,
437 void *data, u32 datasize, u8 flags)
438 {
439 struct tcphdr *tcph;
440 struct iphdr *iph;
441 struct ethhdr *ethh;
442 u8 *buf;
443 u16 packetsize = sizeof(*iph);
444
445 packetsize += sizeof(*tcph);
446 packetsize += optionsize + datasize;
447
448 skb_trim(skb, 0);
449 memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
450
451 buf = skb_put(skb, packetsize + ETH_HLEN);
452
453 ethh = (struct ethhdr *)buf;
454 buf += ETH_HLEN;
455
456 iph = (struct iphdr *)buf;
457 buf += sizeof(*iph);
458 tcph = (struct tcphdr *)buf;
459 skb_reset_mac_header(skb);
460 skb_set_network_header(skb, ETH_HLEN);
461 skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
462 buf += sizeof(*tcph);
463
464 skb->ip_summed = CHECKSUM_PARTIAL;
465 if (!(cm_node->netdev->features & NETIF_F_IP_CSUM))
466 skb->ip_summed = CHECKSUM_NONE;
467 skb->protocol = htons(0x800);
468 skb->data_len = 0;
469 skb->mac_len = ETH_HLEN;
470
471 memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
472 memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
473 ethh->h_proto = htons(0x0800);
474
475 iph->version = IPVERSION;
476 iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
477 iph->tos = 0;
478 iph->tot_len = htons(packetsize);
479 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
480
481 iph->frag_off = htons(0x4000);
482 iph->ttl = 0x40;
483 iph->protocol = 0x06; /* IPPROTO_TCP */
484
485 iph->saddr = htonl(cm_node->loc_addr);
486 iph->daddr = htonl(cm_node->rem_addr);
487
488 tcph->source = htons(cm_node->loc_port);
489 tcph->dest = htons(cm_node->rem_port);
490 tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
491
492 if (flags & SET_ACK) {
493 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
494 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
495 tcph->ack = 1;
496 } else {
497 tcph->ack_seq = 0;
498 }
499
500 if (flags & SET_SYN) {
501 cm_node->tcp_cntxt.loc_seq_num++;
502 tcph->syn = 1;
503 } else {
504 cm_node->tcp_cntxt.loc_seq_num += datasize;
505 }
506
507 if (flags & SET_FIN) {
508 cm_node->tcp_cntxt.loc_seq_num++;
509 tcph->fin = 1;
510 }
511
512 if (flags & SET_RST)
513 tcph->rst = 1;
514
515 tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
516 tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
517 tcph->urg_ptr = 0;
518 if (optionsize)
519 memcpy(buf, options, optionsize);
520 buf += optionsize;
521 if (datasize)
522 memcpy(buf, data, datasize);
523
524 skb_shinfo(skb)->nr_frags = 0;
525 cm_packets_created++;
526 }
527
528 /**
529 * print_core - dump a cm core
530 */
531 static void print_core(struct nes_cm_core *core)
532 {
533 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
534 nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
535 if (!core)
536 return;
537 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
538
539 nes_debug(NES_DBG_CM, "State : %u \n", core->state);
540
541 nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
542 nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
543
544 nes_debug(NES_DBG_CM, "core : %p \n", core);
545
546 nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
547 }
548
549 static void record_ird_ord(struct nes_cm_node *cm_node,
550 u16 conn_ird, u16 conn_ord)
551 {
552 if (conn_ird > NES_MAX_IRD)
553 conn_ird = NES_MAX_IRD;
554
555 if (conn_ord > NES_MAX_ORD)
556 conn_ord = NES_MAX_ORD;
557
558 cm_node->ird_size = conn_ird;
559 cm_node->ord_size = conn_ord;
560 }
561
562 /**
563 * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
564 */
565 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
566 u16 *buff_len, u8 *pci_mem, u8 mpa_key)
567 {
568 int ret = 0;
569
570 *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
571
572 switch (cm_node->mpa_frame_rev) {
573 case IETF_MPA_V1:
574 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
575 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
576 build_mpa_v1(cm_node, *start_buff, mpa_key);
577 break;
578 case IETF_MPA_V2:
579 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
580 build_mpa_v2(cm_node, *start_buff, mpa_key);
581 break;
582 default:
583 ret = -EINVAL;
584 }
585 return ret;
586 }
587
588 /**
589 * build_mpa_v2 - build a MPA V2 frame
590 */
591 static void build_mpa_v2(struct nes_cm_node *cm_node,
592 void *start_addr, u8 mpa_key)
593 {
594 struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
595 struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
596 u16 ctrl_ird;
597 u16 ctrl_ord;
598
599 /* initialize the upper 5 bytes of the frame */
600 build_mpa_v1(cm_node, start_addr, mpa_key);
601 mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
602 mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
603
604 /* initialize RTR msg */
605 if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
606 ctrl_ird = IETF_NO_IRD_ORD;
607 ctrl_ord = IETF_NO_IRD_ORD;
608 } else {
609 ctrl_ird = cm_node->ird_size & IETF_NO_IRD_ORD;
610 ctrl_ord = cm_node->ord_size & IETF_NO_IRD_ORD;
611 }
612 ctrl_ird |= IETF_PEER_TO_PEER;
613
614 switch (mpa_key) {
615 case MPA_KEY_REQUEST:
616 ctrl_ord |= IETF_RDMA0_WRITE;
617 ctrl_ord |= IETF_RDMA0_READ;
618 break;
619 case MPA_KEY_REPLY:
620 switch (cm_node->send_rdma0_op) {
621 case SEND_RDMA_WRITE_ZERO:
622 ctrl_ord |= IETF_RDMA0_WRITE;
623 break;
624 case SEND_RDMA_READ_ZERO:
625 ctrl_ord |= IETF_RDMA0_READ;
626 break;
627 }
628 }
629 rtr_msg->ctrl_ird = htons(ctrl_ird);
630 rtr_msg->ctrl_ord = htons(ctrl_ord);
631 }
632
633 /**
634 * build_mpa_v1 - build a MPA V1 frame
635 */
636 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
637 {
638 struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
639
640 switch (mpa_key) {
641 case MPA_KEY_REQUEST:
642 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
643 break;
644 case MPA_KEY_REPLY:
645 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
646 break;
647 }
648 mpa_frame->flags = IETF_MPA_FLAGS_CRC;
649 mpa_frame->rev = cm_node->mpa_frame_rev;
650 mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
651 }
652
653 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
654 {
655 u64 u64temp;
656 struct nes_qp *nesqp = *nesqp_addr;
657 struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
658
659 u64temp = (unsigned long)nesqp->nesuqp_addr;
660 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
661 set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
662
663 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
664 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
665
666 switch (cm_node->send_rdma0_op) {
667 case SEND_RDMA_WRITE_ZERO:
668 nes_debug(NES_DBG_CM, "Sending first write.\n");
669 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
670 cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
671 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
672 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
673 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
674 break;
675
676 case SEND_RDMA_READ_ZERO:
677 default:
678 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO)
679 WARN(1, "Unsupported RDMA0 len operation=%u\n",
680 cm_node->send_rdma0_op);
681 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
682 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
683 cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
684 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
685 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
686 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
687 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
688 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
689 break;
690 }
691
692 if (nesqp->sq_kmapped) {
693 nesqp->sq_kmapped = 0;
694 kunmap(nesqp->page);
695 }
696
697 /*use the reserved spot on the WQ for the extra first WQE*/
698 nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
699 NES_QPCONTEXT_ORDIRD_WRPDU |
700 NES_QPCONTEXT_ORDIRD_ALSMM));
701 nesqp->skip_lsmm = 1;
702 nesqp->hwqp.sq_tail = 0;
703 }
704
705 /**
706 * schedule_nes_timer
707 * note - cm_node needs to be protected before calling this. Encase in:
708 * rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
709 */
710 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
711 enum nes_timer_type type, int send_retrans,
712 int close_when_complete)
713 {
714 unsigned long flags;
715 struct nes_cm_core *cm_core = cm_node->cm_core;
716 struct nes_timer_entry *new_send;
717 int ret = 0;
718
719 new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
720 if (!new_send)
721 return -ENOMEM;
722
723 /* new_send->timetosend = currenttime */
724 new_send->retrycount = NES_DEFAULT_RETRYS;
725 new_send->retranscount = NES_DEFAULT_RETRANS;
726 new_send->skb = skb;
727 new_send->timetosend = jiffies;
728 new_send->type = type;
729 new_send->netdev = cm_node->netdev;
730 new_send->send_retrans = send_retrans;
731 new_send->close_when_complete = close_when_complete;
732
733 if (type == NES_TIMER_TYPE_CLOSE) {
734 new_send->timetosend += (HZ / 10);
735 if (cm_node->recv_entry) {
736 kfree(new_send);
737 WARN_ON(1);
738 return -EINVAL;
739 }
740 cm_node->recv_entry = new_send;
741 }
742
743 if (type == NES_TIMER_TYPE_SEND) {
744 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
745 refcount_inc(&new_send->skb->users);
746 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
747 cm_node->send_entry = new_send;
748 add_ref_cm_node(cm_node);
749 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
750 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
751
752 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
753 if (ret != NETDEV_TX_OK) {
754 nes_debug(NES_DBG_CM, "Error sending packet %p "
755 "(jiffies = %lu)\n", new_send, jiffies);
756 new_send->timetosend = jiffies;
757 ret = NETDEV_TX_OK;
758 } else {
759 cm_packets_sent++;
760 if (!send_retrans) {
761 cleanup_retrans_entry(cm_node);
762 if (close_when_complete)
763 rem_ref_cm_node(cm_core, cm_node);
764 return ret;
765 }
766 }
767 }
768
769 if (!timer_pending(&cm_core->tcp_timer))
770 mod_timer(&cm_core->tcp_timer, new_send->timetosend);
771
772 return ret;
773 }
774
775 static void nes_retrans_expired(struct nes_cm_node *cm_node)
776 {
777 struct iw_cm_id *cm_id = cm_node->cm_id;
778 enum nes_cm_node_state state = cm_node->state;
779 cm_node->state = NES_CM_STATE_CLOSED;
780
781 switch (state) {
782 case NES_CM_STATE_SYN_RCVD:
783 case NES_CM_STATE_CLOSING:
784 rem_ref_cm_node(cm_node->cm_core, cm_node);
785 break;
786 case NES_CM_STATE_LAST_ACK:
787 case NES_CM_STATE_FIN_WAIT1:
788 if (cm_node->cm_id)
789 cm_id->rem_ref(cm_id);
790 send_reset(cm_node, NULL);
791 break;
792 default:
793 add_ref_cm_node(cm_node);
794 send_reset(cm_node, NULL);
795 create_event(cm_node, NES_CM_EVENT_ABORTED);
796 }
797 }
798
799 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
800 {
801 struct nes_timer_entry *recv_entry = cm_node->recv_entry;
802 struct iw_cm_id *cm_id = cm_node->cm_id;
803 struct nes_qp *nesqp;
804 unsigned long qplockflags;
805
806 if (!recv_entry)
807 return;
808 nesqp = (struct nes_qp *)recv_entry->skb;
809 if (nesqp) {
810 spin_lock_irqsave(&nesqp->lock, qplockflags);
811 if (nesqp->cm_id) {
812 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
813 "refcount = %d: HIT A "
814 "NES_TIMER_TYPE_CLOSE with something "
815 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
816 atomic_read(&nesqp->refcount));
817 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
818 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
819 nesqp->ibqp_state = IB_QPS_ERR;
820 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
821 nes_cm_disconn(nesqp);
822 } else {
823 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
824 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
825 "refcount = %d: HIT A "
826 "NES_TIMER_TYPE_CLOSE with nothing "
827 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
828 atomic_read(&nesqp->refcount));
829 }
830 } else if (rem_node) {
831 /* TIME_WAIT state */
832 rem_ref_cm_node(cm_node->cm_core, cm_node);
833 }
834 if (cm_node->cm_id)
835 cm_id->rem_ref(cm_id);
836 kfree(recv_entry);
837 cm_node->recv_entry = NULL;
838 }
839
840 /**
841 * nes_cm_timer_tick
842 */
843 static void nes_cm_timer_tick(struct timer_list *unused)
844 {
845 unsigned long flags;
846 unsigned long nexttimeout = jiffies + NES_LONG_TIME;
847 struct nes_cm_node *cm_node;
848 struct nes_timer_entry *send_entry, *recv_entry;
849 struct list_head *list_core_temp;
850 struct list_head *list_node;
851 struct nes_cm_core *cm_core = g_cm_core;
852 u32 settimer = 0;
853 unsigned long timetosend;
854 int ret = NETDEV_TX_OK;
855
856 struct list_head timer_list;
857
858 INIT_LIST_HEAD(&timer_list);
859 spin_lock_irqsave(&cm_core->ht_lock, flags);
860
861 list_for_each_safe(list_node, list_core_temp,
862 &cm_core->connected_nodes) {
863 cm_node = container_of(list_node, struct nes_cm_node, list);
864 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
865 add_ref_cm_node(cm_node);
866 list_add(&cm_node->timer_entry, &timer_list);
867 }
868 }
869 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
870
871 list_for_each_safe(list_node, list_core_temp, &timer_list) {
872 cm_node = container_of(list_node, struct nes_cm_node,
873 timer_entry);
874 recv_entry = cm_node->recv_entry;
875
876 if (recv_entry) {
877 if (time_after(recv_entry->timetosend, jiffies)) {
878 if (nexttimeout > recv_entry->timetosend ||
879 !settimer) {
880 nexttimeout = recv_entry->timetosend;
881 settimer = 1;
882 }
883 } else {
884 handle_recv_entry(cm_node, 1);
885 }
886 }
887
888 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
889 do {
890 send_entry = cm_node->send_entry;
891 if (!send_entry)
892 break;
893 if (time_after(send_entry->timetosend, jiffies)) {
894 if (cm_node->state != NES_CM_STATE_TSA) {
895 if ((nexttimeout >
896 send_entry->timetosend) ||
897 !settimer) {
898 nexttimeout =
899 send_entry->timetosend;
900 settimer = 1;
901 }
902 } else {
903 free_retrans_entry(cm_node);
904 }
905 break;
906 }
907
908 if ((cm_node->state == NES_CM_STATE_TSA) ||
909 (cm_node->state == NES_CM_STATE_CLOSED)) {
910 free_retrans_entry(cm_node);
911 break;
912 }
913
914 if (!send_entry->retranscount ||
915 !send_entry->retrycount) {
916 cm_packets_dropped++;
917 free_retrans_entry(cm_node);
918
919 spin_unlock_irqrestore(
920 &cm_node->retrans_list_lock, flags);
921 nes_retrans_expired(cm_node);
922 cm_node->state = NES_CM_STATE_CLOSED;
923 spin_lock_irqsave(&cm_node->retrans_list_lock,
924 flags);
925 break;
926 }
927 refcount_inc(&send_entry->skb->users);
928 cm_packets_retrans++;
929 nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
930 "for node %p, jiffies = %lu, time to send = "
931 "%lu, retranscount = %u, send_entry->seq_num = "
932 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
933 "0x%08X\n", send_entry, cm_node, jiffies,
934 send_entry->timetosend,
935 send_entry->retranscount,
936 send_entry->seq_num,
937 cm_node->tcp_cntxt.rem_ack_num);
938
939 spin_unlock_irqrestore(&cm_node->retrans_list_lock,
940 flags);
941 ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
942 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
943 if (ret != NETDEV_TX_OK) {
944 nes_debug(NES_DBG_CM, "rexmit failed for "
945 "node=%p\n", cm_node);
946 cm_packets_bounced++;
947 send_entry->retrycount--;
948 nexttimeout = jiffies + NES_SHORT_TIME;
949 settimer = 1;
950 break;
951 } else {
952 cm_packets_sent++;
953 }
954 nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
955 "%u, retry count = %u.\n",
956 send_entry->retranscount,
957 send_entry->retrycount);
958 if (send_entry->send_retrans) {
959 send_entry->retranscount--;
960 timetosend = (NES_RETRY_TIMEOUT <<
961 (NES_DEFAULT_RETRANS - send_entry->retranscount));
962
963 send_entry->timetosend = jiffies +
964 min(timetosend, NES_MAX_TIMEOUT);
965 if (nexttimeout > send_entry->timetosend ||
966 !settimer) {
967 nexttimeout = send_entry->timetosend;
968 settimer = 1;
969 }
970 } else {
971 int close_when_complete;
972 close_when_complete =
973 send_entry->close_when_complete;
974 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
975 cm_node, cm_node->state);
976 free_retrans_entry(cm_node);
977 if (close_when_complete)
978 rem_ref_cm_node(cm_node->cm_core,
979 cm_node);
980 }
981 } while (0);
982
983 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
984 rem_ref_cm_node(cm_node->cm_core, cm_node);
985 }
986
987 if (settimer) {
988 if (!timer_pending(&cm_core->tcp_timer))
989 mod_timer(&cm_core->tcp_timer, nexttimeout);
990 }
991 }
992
993
994 /**
995 * send_syn
996 */
997 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
998 struct sk_buff *skb)
999 {
1000 int ret;
1001 int flags = SET_SYN;
1002 char optionsbuffer[sizeof(struct option_mss) +
1003 sizeof(struct option_windowscale) + sizeof(struct option_base) +
1004 TCP_OPTIONS_PADDING];
1005
1006 int optionssize = 0;
1007 /* Sending MSS option */
1008 union all_known_options *options;
1009
1010 if (!cm_node)
1011 return -EINVAL;
1012
1013 options = (union all_known_options *)&optionsbuffer[optionssize];
1014 options->as_mss.optionnum = OPTION_NUMBER_MSS;
1015 options->as_mss.length = sizeof(struct option_mss);
1016 options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1017 optionssize += sizeof(struct option_mss);
1018
1019 options = (union all_known_options *)&optionsbuffer[optionssize];
1020 options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1021 options->as_windowscale.length = sizeof(struct option_windowscale);
1022 options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1023 optionssize += sizeof(struct option_windowscale);
1024
1025 if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
1026 options = (union all_known_options *)&optionsbuffer[optionssize];
1027 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
1028 options->as_base.length = sizeof(struct option_base);
1029 optionssize += sizeof(struct option_base);
1030 /* we need the size to be a multiple of 4 */
1031 options = (union all_known_options *)&optionsbuffer[optionssize];
1032 options->as_end = 1;
1033 optionssize += 1;
1034 options = (union all_known_options *)&optionsbuffer[optionssize];
1035 options->as_end = 1;
1036 optionssize += 1;
1037 }
1038
1039 options = (union all_known_options *)&optionsbuffer[optionssize];
1040 options->as_end = OPTION_NUMBER_END;
1041 optionssize += 1;
1042
1043 if (!skb)
1044 skb = dev_alloc_skb(MAX_CM_BUFFER);
1045 if (!skb) {
1046 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1047 return -1;
1048 }
1049
1050 if (sendack)
1051 flags |= SET_ACK;
1052
1053 form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1054 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1055
1056 return ret;
1057 }
1058
1059
1060 /**
1061 * send_reset
1062 */
1063 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1064 {
1065 int ret;
1066 int flags = SET_RST | SET_ACK;
1067
1068 if (!skb)
1069 skb = dev_alloc_skb(MAX_CM_BUFFER);
1070 if (!skb) {
1071 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1072 return -ENOMEM;
1073 }
1074
1075 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1076 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1077
1078 return ret;
1079 }
1080
1081
1082 /**
1083 * send_ack
1084 */
1085 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1086 {
1087 int ret;
1088
1089 if (!skb)
1090 skb = dev_alloc_skb(MAX_CM_BUFFER);
1091
1092 if (!skb) {
1093 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1094 return -1;
1095 }
1096
1097 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1098 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1099
1100 return ret;
1101 }
1102
1103
1104 /**
1105 * send_fin
1106 */
1107 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1108 {
1109 int ret;
1110
1111 /* if we didn't get a frame get one */
1112 if (!skb)
1113 skb = dev_alloc_skb(MAX_CM_BUFFER);
1114
1115 if (!skb) {
1116 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1117 return -1;
1118 }
1119
1120 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1121 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1122
1123 return ret;
1124 }
1125
1126
1127 /**
1128 * find_node - find a cm node that matches the reference cm node
1129 */
1130 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1131 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1132 {
1133 unsigned long flags;
1134 struct list_head *hte;
1135 struct nes_cm_node *cm_node;
1136
1137 /* get a handle on the hte */
1138 hte = &cm_core->connected_nodes;
1139
1140 /* walk list and find cm_node associated with this session ID */
1141 spin_lock_irqsave(&cm_core->ht_lock, flags);
1142 list_for_each_entry(cm_node, hte, list) {
1143 /* compare quad, return node handle if a match */
1144 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1145 cm_node->loc_addr, cm_node->loc_port,
1146 loc_addr, loc_port,
1147 cm_node->rem_addr, cm_node->rem_port,
1148 rem_addr, rem_port);
1149 if ((cm_node->loc_addr == loc_addr) &&
1150 (cm_node->loc_port == loc_port) &&
1151 (cm_node->rem_addr == rem_addr) &&
1152 (cm_node->rem_port == rem_port)) {
1153 add_ref_cm_node(cm_node);
1154 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1155 return cm_node;
1156 }
1157 }
1158 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1159
1160 /* no owner node */
1161 return NULL;
1162 }
1163
1164
1165 /**
1166 * find_listener - find a cm node listening on this addr-port pair
1167 */
1168 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1169 nes_addr_t dst_addr, u16 dst_port,
1170 enum nes_cm_listener_state listener_state)
1171 {
1172 unsigned long flags;
1173 struct nes_cm_listener *listen_node;
1174 nes_addr_t listen_addr;
1175 u16 listen_port;
1176
1177 /* walk list and find cm_node associated with this session ID */
1178 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1179 list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1180 listen_addr = listen_node->loc_addr;
1181 listen_port = listen_node->loc_port;
1182
1183 /* compare node pair, return node handle if a match */
1184 if (((listen_addr == dst_addr) ||
1185 listen_addr == 0x00000000) &&
1186 (listen_port == dst_port) &&
1187 (listener_state & listen_node->listener_state)) {
1188 atomic_inc(&listen_node->ref_count);
1189 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1190 return listen_node;
1191 }
1192 }
1193 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1194
1195 /* no listener */
1196 return NULL;
1197 }
1198
1199 /**
1200 * add_hte_node - add a cm node to the hash table
1201 */
1202 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1203 {
1204 unsigned long flags;
1205 struct list_head *hte;
1206
1207 if (!cm_node || !cm_core)
1208 return -EINVAL;
1209
1210 nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1211 cm_node);
1212
1213 spin_lock_irqsave(&cm_core->ht_lock, flags);
1214
1215 /* get a handle on the hash table element (list head for this slot) */
1216 hte = &cm_core->connected_nodes;
1217 list_add_tail(&cm_node->list, hte);
1218 atomic_inc(&cm_core->ht_node_cnt);
1219
1220 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1221
1222 return 0;
1223 }
1224
1225
1226 /**
1227 * mini_cm_dec_refcnt_listen
1228 */
1229 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1230 struct nes_cm_listener *listener, int free_hanging_nodes)
1231 {
1232 int ret = -EINVAL;
1233 int err = 0;
1234 unsigned long flags;
1235 struct list_head *list_pos = NULL;
1236 struct list_head *list_temp = NULL;
1237 struct nes_cm_node *cm_node = NULL;
1238 struct list_head reset_list;
1239
1240 nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1241 "refcnt=%d\n", listener, free_hanging_nodes,
1242 atomic_read(&listener->ref_count));
1243 /* free non-accelerated child nodes for this listener */
1244 INIT_LIST_HEAD(&reset_list);
1245 if (free_hanging_nodes) {
1246 spin_lock_irqsave(&cm_core->ht_lock, flags);
1247 list_for_each_safe(list_pos, list_temp,
1248 &g_cm_core->connected_nodes) {
1249 cm_node = container_of(list_pos, struct nes_cm_node,
1250 list);
1251 if ((cm_node->listener == listener) &&
1252 (!cm_node->accelerated)) {
1253 add_ref_cm_node(cm_node);
1254 list_add(&cm_node->reset_entry, &reset_list);
1255 }
1256 }
1257 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1258 }
1259
1260 list_for_each_safe(list_pos, list_temp, &reset_list) {
1261 cm_node = container_of(list_pos, struct nes_cm_node,
1262 reset_entry);
1263 {
1264 struct nes_cm_node *loopback = cm_node->loopbackpartner;
1265 enum nes_cm_node_state old_state;
1266 if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1267 rem_ref_cm_node(cm_node->cm_core, cm_node);
1268 } else {
1269 if (!loopback) {
1270 cleanup_retrans_entry(cm_node);
1271 err = send_reset(cm_node, NULL);
1272 if (err) {
1273 cm_node->state =
1274 NES_CM_STATE_CLOSED;
1275 WARN_ON(1);
1276 } else {
1277 old_state = cm_node->state;
1278 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1279 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1280 rem_ref_cm_node(
1281 cm_node->cm_core,
1282 cm_node);
1283 }
1284 } else {
1285 struct nes_cm_event event;
1286
1287 event.cm_node = loopback;
1288 event.cm_info.rem_addr =
1289 loopback->rem_addr;
1290 event.cm_info.loc_addr =
1291 loopback->loc_addr;
1292 event.cm_info.rem_port =
1293 loopback->rem_port;
1294 event.cm_info.loc_port =
1295 loopback->loc_port;
1296 event.cm_info.cm_id = loopback->cm_id;
1297 add_ref_cm_node(loopback);
1298 loopback->state = NES_CM_STATE_CLOSED;
1299 cm_event_connect_error(&event);
1300 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1301
1302 rem_ref_cm_node(cm_node->cm_core,
1303 cm_node);
1304
1305 }
1306 }
1307 }
1308 }
1309
1310 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1311 if (!atomic_dec_return(&listener->ref_count)) {
1312 list_del(&listener->list);
1313
1314 /* decrement our listen node count */
1315 atomic_dec(&cm_core->listen_node_cnt);
1316
1317 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1318
1319 if (listener->nesvnic) {
1320 nes_manage_apbvt(listener->nesvnic,
1321 listener->loc_port,
1322 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn),
1323 NES_MANAGE_APBVT_DEL);
1324
1325 nes_debug(NES_DBG_NLMSG,
1326 "Delete APBVT loc_port = %04X\n",
1327 listener->loc_port);
1328 }
1329
1330 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1331
1332 kfree(listener);
1333 listener = NULL;
1334 ret = 0;
1335 atomic_inc(&cm_listens_destroyed);
1336 } else {
1337 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1338 }
1339 if (listener) {
1340 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1341 nes_debug(NES_DBG_CM, "destroying listener (%p)"
1342 " with non-zero pending accepts=%u\n",
1343 listener, atomic_read(&listener->pend_accepts_cnt));
1344 }
1345
1346 return ret;
1347 }
1348
1349
1350 /**
1351 * mini_cm_del_listen
1352 */
1353 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1354 struct nes_cm_listener *listener)
1355 {
1356 listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1357 listener->cm_id = NULL; /* going to be destroyed pretty soon */
1358 return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1359 }
1360
1361
1362 /**
1363 * mini_cm_accelerated
1364 */
1365 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1366 struct nes_cm_node *cm_node)
1367 {
1368 cm_node->accelerated = true;
1369
1370 if (cm_node->accept_pend) {
1371 BUG_ON(!cm_node->listener);
1372 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1373 cm_node->accept_pend = 0;
1374 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1375 }
1376
1377 if (!timer_pending(&cm_core->tcp_timer))
1378 mod_timer(&cm_core->tcp_timer, (jiffies + NES_SHORT_TIME));
1379
1380 return 0;
1381 }
1382
1383
1384 /**
1385 * nes_addr_resolve_neigh
1386 */
1387 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1388 {
1389 struct rtable *rt;
1390 struct neighbour *neigh;
1391 int rc = arpindex;
1392 struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1393 __be32 dst_ipaddr = htonl(dst_ip);
1394
1395 rt = ip_route_output(&init_net, dst_ipaddr, nesvnic->local_ipaddr, 0, 0);
1396 if (IS_ERR(rt)) {
1397 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1398 __func__, dst_ip);
1399 return rc;
1400 }
1401
1402 neigh = dst_neigh_lookup(&rt->dst, &dst_ipaddr);
1403
1404 rcu_read_lock();
1405 if (neigh) {
1406 if (neigh->nud_state & NUD_VALID) {
1407 nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1408 " is %pM, Gateway is 0x%08X \n", dst_ip,
1409 neigh->ha, ntohl(rt->rt_gateway));
1410
1411 if (arpindex >= 0) {
1412 if (ether_addr_equal(nesadapter->arp_table[arpindex].mac_addr, neigh->ha)) {
1413 /* Mac address same as in nes_arp_table */
1414 goto out;
1415 }
1416
1417 nes_manage_arp_cache(nesvnic->netdev,
1418 nesadapter->arp_table[arpindex].mac_addr,
1419 dst_ip, NES_ARP_DELETE);
1420 }
1421
1422 nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1423 dst_ip, NES_ARP_ADD);
1424 rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1425 NES_ARP_RESOLVE);
1426 } else {
1427 neigh_event_send(neigh, NULL);
1428 }
1429 }
1430 out:
1431 rcu_read_unlock();
1432
1433 if (neigh)
1434 neigh_release(neigh);
1435
1436 ip_rt_put(rt);
1437 return rc;
1438 }
1439
1440 /**
1441 * make_cm_node - create a new instance of a cm node
1442 */
1443 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1444 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1445 struct nes_cm_listener *listener)
1446 {
1447 struct nes_cm_node *cm_node;
1448 struct timespec ts;
1449 int oldarpindex = 0;
1450 int arpindex = 0;
1451 struct nes_device *nesdev;
1452 struct nes_adapter *nesadapter;
1453
1454 /* create an hte and cm_node for this instance */
1455 cm_node = kzalloc(sizeof(*cm_node), GFP_ATOMIC);
1456 if (!cm_node)
1457 return NULL;
1458
1459 /* set our node specific transport info */
1460 if (listener) {
1461 cm_node->loc_addr = listener->loc_addr;
1462 cm_node->loc_port = listener->loc_port;
1463 } else {
1464 cm_node->loc_addr = cm_info->loc_addr;
1465 cm_node->loc_port = cm_info->loc_port;
1466 }
1467 cm_node->rem_addr = cm_info->rem_addr;
1468 cm_node->rem_port = cm_info->rem_port;
1469
1470 cm_node->mpa_frame_rev = mpa_version;
1471 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
1472 cm_node->mpav2_ird_ord = 0;
1473 cm_node->ird_size = 0;
1474 cm_node->ord_size = 0;
1475
1476 nes_debug(NES_DBG_CM, "Make node addresses : loc = %pI4:%x, rem = %pI4:%x\n",
1477 &cm_node->loc_addr, cm_node->loc_port,
1478 &cm_node->rem_addr, cm_node->rem_port);
1479 cm_node->listener = listener;
1480 if (listener)
1481 cm_node->tos = listener->tos;
1482 cm_node->netdev = nesvnic->netdev;
1483 cm_node->cm_id = cm_info->cm_id;
1484 memcpy(cm_node->loc_mac, nesvnic->netdev->dev_addr, ETH_ALEN);
1485
1486 nes_debug(NES_DBG_CM, "listener=%p, cm_id=%p\n", cm_node->listener,
1487 cm_node->cm_id);
1488
1489 spin_lock_init(&cm_node->retrans_list_lock);
1490
1491 cm_node->loopbackpartner = NULL;
1492 atomic_set(&cm_node->ref_count, 1);
1493 /* associate our parent CM core */
1494 cm_node->cm_core = cm_core;
1495 cm_node->tcp_cntxt.loc_id = NES_CM_DEF_LOCAL_ID;
1496 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
1497 cm_node->tcp_cntxt.rcv_wnd = NES_CM_DEFAULT_RCV_WND_SCALED >>
1498 NES_CM_DEFAULT_RCV_WND_SCALE;
1499 ts = current_kernel_time();
1500 cm_node->tcp_cntxt.loc_seq_num = htonl(ts.tv_nsec);
1501 cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1502 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1503 cm_node->tcp_cntxt.rcv_nxt = 0;
1504 /* get a unique session ID , add thread_id to an upcounter to handle race */
1505 atomic_inc(&cm_core->node_cnt);
1506 cm_node->conn_type = cm_info->conn_type;
1507 cm_node->apbvt_set = 0;
1508 cm_node->accept_pend = 0;
1509
1510 cm_node->nesvnic = nesvnic;
1511 /* get some device handles, for arp lookup */
1512 nesdev = nesvnic->nesdev;
1513 nesadapter = nesdev->nesadapter;
1514
1515 cm_node->loopbackpartner = NULL;
1516
1517 /* get the mac addr for the remote node */
1518 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr,
1519 NULL, NES_ARP_RESOLVE);
1520 arpindex = nes_addr_resolve_neigh(nesvnic, cm_node->rem_addr,
1521 oldarpindex);
1522 if (arpindex < 0) {
1523 kfree(cm_node);
1524 return NULL;
1525 }
1526
1527 /* copy the mac addr to node context */
1528 memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1529 nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1530 cm_node->rem_mac);
1531
1532 add_hte_node(cm_core, cm_node);
1533 atomic_inc(&cm_nodes_created);
1534
1535 return cm_node;
1536 }
1537
1538
1539 /**
1540 * add_ref_cm_node - destroy an instance of a cm node
1541 */
1542 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1543 {
1544 atomic_inc(&cm_node->ref_count);
1545 return 0;
1546 }
1547
1548
1549 /**
1550 * rem_ref_cm_node - destroy an instance of a cm node
1551 */
1552 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1553 struct nes_cm_node *cm_node)
1554 {
1555 unsigned long flags;
1556 struct nes_qp *nesqp;
1557
1558 if (!cm_node)
1559 return -EINVAL;
1560
1561 spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1562 if (atomic_dec_return(&cm_node->ref_count)) {
1563 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1564 return 0;
1565 }
1566 list_del(&cm_node->list);
1567 atomic_dec(&cm_core->ht_node_cnt);
1568 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1569
1570 /* if the node is destroyed before connection was accelerated */
1571 if (!cm_node->accelerated && cm_node->accept_pend) {
1572 BUG_ON(!cm_node->listener);
1573 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1574 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1575 }
1576 WARN_ON(cm_node->send_entry);
1577 if (cm_node->recv_entry)
1578 handle_recv_entry(cm_node, 0);
1579 if (cm_node->listener) {
1580 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1581 } else {
1582 if (cm_node->apbvt_set && cm_node->nesvnic) {
1583 nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1584 PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1585 NES_MANAGE_APBVT_DEL);
1586 }
1587 nes_debug(NES_DBG_NLMSG, "Delete APBVT loc_port = %04X\n",
1588 cm_node->loc_port);
1589 }
1590
1591 atomic_dec(&cm_core->node_cnt);
1592 atomic_inc(&cm_nodes_destroyed);
1593 nesqp = cm_node->nesqp;
1594 if (nesqp) {
1595 nesqp->cm_node = NULL;
1596 nes_rem_ref(&nesqp->ibqp);
1597 cm_node->nesqp = NULL;
1598 }
1599
1600 kfree(cm_node);
1601 return 0;
1602 }
1603
1604 /**
1605 * process_options
1606 */
1607 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1608 u32 optionsize, u32 syn_packet)
1609 {
1610 u32 tmp;
1611 u32 offset = 0;
1612 union all_known_options *all_options;
1613 char got_mss_option = 0;
1614
1615 while (offset < optionsize) {
1616 all_options = (union all_known_options *)(optionsloc + offset);
1617 switch (all_options->as_base.optionnum) {
1618 case OPTION_NUMBER_END:
1619 offset = optionsize;
1620 break;
1621 case OPTION_NUMBER_NONE:
1622 offset += 1;
1623 continue;
1624 case OPTION_NUMBER_MSS:
1625 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1626 "Size: %d\n", __func__,
1627 all_options->as_mss.length, offset, optionsize);
1628 got_mss_option = 1;
1629 if (all_options->as_mss.length != 4) {
1630 return 1;
1631 } else {
1632 tmp = ntohs(all_options->as_mss.mss);
1633 if (tmp > 0 && tmp <
1634 cm_node->tcp_cntxt.mss)
1635 cm_node->tcp_cntxt.mss = tmp;
1636 }
1637 break;
1638 case OPTION_NUMBER_WINDOW_SCALE:
1639 cm_node->tcp_cntxt.snd_wscale =
1640 all_options->as_windowscale.shiftcount;
1641 break;
1642 default:
1643 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1644 all_options->as_base.optionnum);
1645 break;
1646 }
1647 offset += all_options->as_base.length;
1648 }
1649 if ((!got_mss_option) && (syn_packet))
1650 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1651 return 0;
1652 }
1653
1654 static void drop_packet(struct sk_buff *skb)
1655 {
1656 atomic_inc(&cm_accel_dropped_pkts);
1657 dev_kfree_skb_any(skb);
1658 }
1659
1660 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1661 {
1662 nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1663 "refcnt=%d\n", cm_node, cm_node->state,
1664 atomic_read(&cm_node->ref_count));
1665 switch (cm_node->state) {
1666 case NES_CM_STATE_SYN_RCVD:
1667 case NES_CM_STATE_SYN_SENT:
1668 case NES_CM_STATE_ESTABLISHED:
1669 case NES_CM_STATE_MPAREJ_RCVD:
1670 cm_node->tcp_cntxt.rcv_nxt++;
1671 cleanup_retrans_entry(cm_node);
1672 cm_node->state = NES_CM_STATE_LAST_ACK;
1673 send_fin(cm_node, NULL);
1674 break;
1675 case NES_CM_STATE_MPAREQ_SENT:
1676 create_event(cm_node, NES_CM_EVENT_ABORTED);
1677 cm_node->tcp_cntxt.rcv_nxt++;
1678 cleanup_retrans_entry(cm_node);
1679 cm_node->state = NES_CM_STATE_CLOSED;
1680 add_ref_cm_node(cm_node);
1681 send_reset(cm_node, NULL);
1682 break;
1683 case NES_CM_STATE_FIN_WAIT1:
1684 cm_node->tcp_cntxt.rcv_nxt++;
1685 cleanup_retrans_entry(cm_node);
1686 cm_node->state = NES_CM_STATE_CLOSING;
1687 send_ack(cm_node, NULL);
1688 /* Wait for ACK as this is simultaneous close..
1689 * After we receive ACK, do not send anything..
1690 * Just rm the node.. Done.. */
1691 break;
1692 case NES_CM_STATE_FIN_WAIT2:
1693 cm_node->tcp_cntxt.rcv_nxt++;
1694 cleanup_retrans_entry(cm_node);
1695 cm_node->state = NES_CM_STATE_TIME_WAIT;
1696 send_ack(cm_node, NULL);
1697 schedule_nes_timer(cm_node, NULL, NES_TIMER_TYPE_CLOSE, 1, 0);
1698 break;
1699 case NES_CM_STATE_TIME_WAIT:
1700 cm_node->tcp_cntxt.rcv_nxt++;
1701 cleanup_retrans_entry(cm_node);
1702 cm_node->state = NES_CM_STATE_CLOSED;
1703 rem_ref_cm_node(cm_node->cm_core, cm_node);
1704 break;
1705 case NES_CM_STATE_TSA:
1706 default:
1707 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1708 cm_node, cm_node->state);
1709 break;
1710 }
1711 }
1712
1713
1714 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1715 struct tcphdr *tcph)
1716 {
1717
1718 int reset = 0; /* whether to send reset in case of err.. */
1719 atomic_inc(&cm_resets_recvd);
1720 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1721 " refcnt=%d\n", cm_node, cm_node->state,
1722 atomic_read(&cm_node->ref_count));
1723 cleanup_retrans_entry(cm_node);
1724 switch (cm_node->state) {
1725 case NES_CM_STATE_SYN_SENT:
1726 case NES_CM_STATE_MPAREQ_SENT:
1727 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1728 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1729 cm_node->listener, cm_node->state);
1730 switch (cm_node->mpa_frame_rev) {
1731 case IETF_MPA_V2:
1732 cm_node->mpa_frame_rev = IETF_MPA_V1;
1733 /* send a syn and goto syn sent state */
1734 cm_node->state = NES_CM_STATE_SYN_SENT;
1735 if (send_syn(cm_node, 0, NULL)) {
1736 active_open_err(cm_node, skb, reset);
1737 }
1738 break;
1739 case IETF_MPA_V1:
1740 default:
1741 active_open_err(cm_node, skb, reset);
1742 break;
1743 }
1744 break;
1745 case NES_CM_STATE_MPAREQ_RCVD:
1746 atomic_inc(&cm_node->passive_state);
1747 dev_kfree_skb_any(skb);
1748 break;
1749 case NES_CM_STATE_ESTABLISHED:
1750 case NES_CM_STATE_SYN_RCVD:
1751 case NES_CM_STATE_LISTENING:
1752 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1753 passive_open_err(cm_node, skb, reset);
1754 break;
1755 case NES_CM_STATE_TSA:
1756 active_open_err(cm_node, skb, reset);
1757 break;
1758 case NES_CM_STATE_CLOSED:
1759 drop_packet(skb);
1760 break;
1761 case NES_CM_STATE_FIN_WAIT2:
1762 case NES_CM_STATE_FIN_WAIT1:
1763 case NES_CM_STATE_LAST_ACK:
1764 cm_node->cm_id->rem_ref(cm_node->cm_id);
1765 /* fall through */
1766 case NES_CM_STATE_TIME_WAIT:
1767 cm_node->state = NES_CM_STATE_CLOSED;
1768 rem_ref_cm_node(cm_node->cm_core, cm_node);
1769 drop_packet(skb);
1770 break;
1771 default:
1772 drop_packet(skb);
1773 break;
1774 }
1775 }
1776
1777
1778 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1779 {
1780 int ret = 0;
1781 int datasize = skb->len;
1782 u8 *dataloc = skb->data;
1783
1784 enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1785 u32 res_type;
1786
1787 ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1788 if (ret) {
1789 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1790 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1791 nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1792 "cm_node=%p listener=%p state=%d\n", __func__,
1793 __LINE__, cm_node, cm_node->listener,
1794 cm_node->state);
1795 active_open_err(cm_node, skb, 1);
1796 } else {
1797 passive_open_err(cm_node, skb, 1);
1798 }
1799 return;
1800 }
1801
1802 switch (cm_node->state) {
1803 case NES_CM_STATE_ESTABLISHED:
1804 if (res_type == NES_MPA_REQUEST_REJECT)
1805 /*BIG problem as we are receiving the MPA.. So should
1806 * not be REJECT.. This is Passive Open.. We can
1807 * only receive it Reject for Active Open...*/
1808 WARN_ON(1);
1809 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1810 type = NES_CM_EVENT_MPA_REQ;
1811 atomic_set(&cm_node->passive_state,
1812 NES_PASSIVE_STATE_INDICATED);
1813 break;
1814 case NES_CM_STATE_MPAREQ_SENT:
1815 cleanup_retrans_entry(cm_node);
1816 if (res_type == NES_MPA_REQUEST_REJECT) {
1817 type = NES_CM_EVENT_MPA_REJECT;
1818 cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1819 } else {
1820 type = NES_CM_EVENT_CONNECTED;
1821 cm_node->state = NES_CM_STATE_TSA;
1822 }
1823 send_ack(cm_node, NULL);
1824 break;
1825 default:
1826 WARN_ON(1);
1827 break;
1828 }
1829 dev_kfree_skb_any(skb);
1830 create_event(cm_node, type);
1831 }
1832
1833 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1834 {
1835 switch (cm_node->state) {
1836 case NES_CM_STATE_SYN_SENT:
1837 case NES_CM_STATE_MPAREQ_SENT:
1838 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1839 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1840 cm_node->listener, cm_node->state);
1841 active_open_err(cm_node, skb, 1);
1842 break;
1843 case NES_CM_STATE_ESTABLISHED:
1844 case NES_CM_STATE_SYN_RCVD:
1845 passive_open_err(cm_node, skb, 1);
1846 break;
1847 case NES_CM_STATE_TSA:
1848 default:
1849 drop_packet(skb);
1850 }
1851 }
1852
1853 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1854 struct sk_buff *skb)
1855 {
1856 int err;
1857
1858 err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1859 if (err)
1860 active_open_err(cm_node, skb, 1);
1861
1862 return err;
1863 }
1864
1865 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1866 struct sk_buff *skb)
1867 {
1868 int err = 0;
1869 u32 seq;
1870 u32 ack_seq;
1871 u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1872 u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1873 u32 rcv_wnd;
1874
1875 seq = ntohl(tcph->seq);
1876 ack_seq = ntohl(tcph->ack_seq);
1877 rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1878 if (ack_seq != loc_seq_num)
1879 err = 1;
1880 else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1881 err = 1;
1882 if (err) {
1883 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1884 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1885 cm_node->listener, cm_node->state);
1886 indicate_pkt_err(cm_node, skb);
1887 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1888 "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1889 rcv_wnd);
1890 }
1891 return err;
1892 }
1893
1894 /*
1895 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1896 * is created with a listener or it may comein as rexmitted packet which in
1897 * that case will be just dropped.
1898 */
1899 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1900 struct tcphdr *tcph)
1901 {
1902 int ret;
1903 u32 inc_sequence;
1904 int optionsize;
1905
1906 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1907 skb_trim(skb, 0);
1908 inc_sequence = ntohl(tcph->seq);
1909
1910 switch (cm_node->state) {
1911 case NES_CM_STATE_SYN_SENT:
1912 case NES_CM_STATE_MPAREQ_SENT:
1913 /* Rcvd syn on active open connection*/
1914 active_open_err(cm_node, skb, 1);
1915 break;
1916 case NES_CM_STATE_LISTENING:
1917 /* Passive OPEN */
1918 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1919 cm_node->listener->backlog) {
1920 nes_debug(NES_DBG_CM, "drop syn due to backlog "
1921 "pressure \n");
1922 cm_backlog_drops++;
1923 passive_open_err(cm_node, skb, 0);
1924 break;
1925 }
1926 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1927 1);
1928 if (ret) {
1929 passive_open_err(cm_node, skb, 0);
1930 /* drop pkt */
1931 break;
1932 }
1933 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1934 BUG_ON(cm_node->send_entry);
1935 cm_node->accept_pend = 1;
1936 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1937
1938 cm_node->state = NES_CM_STATE_SYN_RCVD;
1939 send_syn(cm_node, 1, skb);
1940 break;
1941 case NES_CM_STATE_CLOSED:
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_TSA:
1947 case NES_CM_STATE_ESTABLISHED:
1948 case NES_CM_STATE_FIN_WAIT1:
1949 case NES_CM_STATE_FIN_WAIT2:
1950 case NES_CM_STATE_MPAREQ_RCVD:
1951 case NES_CM_STATE_LAST_ACK:
1952 case NES_CM_STATE_CLOSING:
1953 case NES_CM_STATE_UNKNOWN:
1954 default:
1955 drop_packet(skb);
1956 break;
1957 }
1958 }
1959
1960 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1961 struct tcphdr *tcph)
1962 {
1963 int ret;
1964 u32 inc_sequence;
1965 int optionsize;
1966
1967 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1968 skb_trim(skb, 0);
1969 inc_sequence = ntohl(tcph->seq);
1970 switch (cm_node->state) {
1971 case NES_CM_STATE_SYN_SENT:
1972 cleanup_retrans_entry(cm_node);
1973 /* active open */
1974 if (check_syn(cm_node, tcph, skb))
1975 return;
1976 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1977 /* setup options */
1978 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1979 if (ret) {
1980 nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1981 cm_node);
1982 break;
1983 }
1984 cleanup_retrans_entry(cm_node);
1985 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1986 send_mpa_request(cm_node, skb);
1987 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1988 break;
1989 case NES_CM_STATE_MPAREQ_RCVD:
1990 /* passive open, so should not be here */
1991 passive_open_err(cm_node, skb, 1);
1992 break;
1993 case NES_CM_STATE_LISTENING:
1994 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1995 cleanup_retrans_entry(cm_node);
1996 cm_node->state = NES_CM_STATE_CLOSED;
1997 send_reset(cm_node, skb);
1998 break;
1999 case NES_CM_STATE_CLOSED:
2000 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2001 cleanup_retrans_entry(cm_node);
2002 add_ref_cm_node(cm_node);
2003 send_reset(cm_node, skb);
2004 break;
2005 case NES_CM_STATE_ESTABLISHED:
2006 case NES_CM_STATE_FIN_WAIT1:
2007 case NES_CM_STATE_FIN_WAIT2:
2008 case NES_CM_STATE_LAST_ACK:
2009 case NES_CM_STATE_TSA:
2010 case NES_CM_STATE_CLOSING:
2011 case NES_CM_STATE_UNKNOWN:
2012 case NES_CM_STATE_MPAREQ_SENT:
2013 default:
2014 drop_packet(skb);
2015 break;
2016 }
2017 }
2018
2019 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
2020 struct tcphdr *tcph)
2021 {
2022 int datasize = 0;
2023 u32 inc_sequence;
2024 int ret = 0;
2025 int optionsize;
2026
2027 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2028
2029 if (check_seq(cm_node, tcph, skb))
2030 return -EINVAL;
2031
2032 skb_pull(skb, tcph->doff << 2);
2033 inc_sequence = ntohl(tcph->seq);
2034 datasize = skb->len;
2035 switch (cm_node->state) {
2036 case NES_CM_STATE_SYN_RCVD:
2037 /* Passive OPEN */
2038 cleanup_retrans_entry(cm_node);
2039 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
2040 if (ret)
2041 break;
2042 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2043 cm_node->state = NES_CM_STATE_ESTABLISHED;
2044 if (datasize) {
2045 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2046 handle_rcv_mpa(cm_node, skb);
2047 } else { /* rcvd ACK only */
2048 dev_kfree_skb_any(skb);
2049 }
2050 break;
2051 case NES_CM_STATE_ESTABLISHED:
2052 /* Passive OPEN */
2053 cleanup_retrans_entry(cm_node);
2054 if (datasize) {
2055 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2056 handle_rcv_mpa(cm_node, skb);
2057 } else {
2058 drop_packet(skb);
2059 }
2060 break;
2061 case NES_CM_STATE_MPAREQ_SENT:
2062 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2063 if (datasize) {
2064 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2065 handle_rcv_mpa(cm_node, skb);
2066 } else { /* Could be just an ack pkt.. */
2067 dev_kfree_skb_any(skb);
2068 }
2069 break;
2070 case NES_CM_STATE_LISTENING:
2071 cleanup_retrans_entry(cm_node);
2072 cm_node->state = NES_CM_STATE_CLOSED;
2073 send_reset(cm_node, skb);
2074 break;
2075 case NES_CM_STATE_CLOSED:
2076 cleanup_retrans_entry(cm_node);
2077 add_ref_cm_node(cm_node);
2078 send_reset(cm_node, skb);
2079 break;
2080 case NES_CM_STATE_LAST_ACK:
2081 case NES_CM_STATE_CLOSING:
2082 cleanup_retrans_entry(cm_node);
2083 cm_node->state = NES_CM_STATE_CLOSED;
2084 cm_node->cm_id->rem_ref(cm_node->cm_id);
2085 rem_ref_cm_node(cm_node->cm_core, cm_node);
2086 drop_packet(skb);
2087 break;
2088 case NES_CM_STATE_FIN_WAIT1:
2089 cleanup_retrans_entry(cm_node);
2090 drop_packet(skb);
2091 cm_node->state = NES_CM_STATE_FIN_WAIT2;
2092 break;
2093 case NES_CM_STATE_SYN_SENT:
2094 case NES_CM_STATE_FIN_WAIT2:
2095 case NES_CM_STATE_TSA:
2096 case NES_CM_STATE_MPAREQ_RCVD:
2097 case NES_CM_STATE_UNKNOWN:
2098 default:
2099 cleanup_retrans_entry(cm_node);
2100 drop_packet(skb);
2101 break;
2102 }
2103 return ret;
2104 }
2105
2106
2107
2108 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2109 struct sk_buff *skb, int optionsize, int passive)
2110 {
2111 u8 *optionsloc = (u8 *)&tcph[1];
2112
2113 if (optionsize) {
2114 if (process_options(cm_node, optionsloc, optionsize,
2115 (u32)tcph->syn)) {
2116 nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2117 __func__, cm_node);
2118 if (passive)
2119 passive_open_err(cm_node, skb, 1);
2120 else
2121 active_open_err(cm_node, skb, 1);
2122 return 1;
2123 }
2124 }
2125
2126 cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2127 cm_node->tcp_cntxt.snd_wscale;
2128
2129 if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2130 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2131 return 0;
2132 }
2133
2134 /*
2135 * active_open_err() will send reset() if flag set..
2136 * It will also send ABORT event.
2137 */
2138 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2139 int reset)
2140 {
2141 cleanup_retrans_entry(cm_node);
2142 if (reset) {
2143 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2144 "state=%d\n", cm_node, cm_node->state);
2145 add_ref_cm_node(cm_node);
2146 send_reset(cm_node, skb);
2147 } else {
2148 dev_kfree_skb_any(skb);
2149 }
2150
2151 cm_node->state = NES_CM_STATE_CLOSED;
2152 create_event(cm_node, NES_CM_EVENT_ABORTED);
2153 }
2154
2155 /*
2156 * passive_open_err() will either do a reset() or will free up the skb and
2157 * remove the cm_node.
2158 */
2159 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2160 int reset)
2161 {
2162 cleanup_retrans_entry(cm_node);
2163 cm_node->state = NES_CM_STATE_CLOSED;
2164 if (reset) {
2165 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2166 "cm_node=%p state =%d\n", cm_node, cm_node->state);
2167 send_reset(cm_node, skb);
2168 } else {
2169 dev_kfree_skb_any(skb);
2170 rem_ref_cm_node(cm_node->cm_core, cm_node);
2171 }
2172 }
2173
2174 /*
2175 * free_retrans_entry() routines assumes that the retrans_list_lock has
2176 * been acquired before calling.
2177 */
2178 static void free_retrans_entry(struct nes_cm_node *cm_node)
2179 {
2180 struct nes_timer_entry *send_entry;
2181
2182 send_entry = cm_node->send_entry;
2183 if (send_entry) {
2184 cm_node->send_entry = NULL;
2185 dev_kfree_skb_any(send_entry->skb);
2186 kfree(send_entry);
2187 rem_ref_cm_node(cm_node->cm_core, cm_node);
2188 }
2189 }
2190
2191 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2192 {
2193 unsigned long flags;
2194
2195 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2196 free_retrans_entry(cm_node);
2197 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2198 }
2199
2200 /**
2201 * process_packet
2202 * Returns skb if to be freed, else it will return NULL if already used..
2203 */
2204 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2205 struct nes_cm_core *cm_core)
2206 {
2207 enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2208 struct tcphdr *tcph = tcp_hdr(skb);
2209 u32 fin_set = 0;
2210 int ret = 0;
2211
2212 skb_pull(skb, ip_hdr(skb)->ihl << 2);
2213
2214 nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2215 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2216 tcph->ack, tcph->rst, tcph->fin);
2217
2218 if (tcph->rst) {
2219 pkt_type = NES_PKT_TYPE_RST;
2220 } else if (tcph->syn) {
2221 pkt_type = NES_PKT_TYPE_SYN;
2222 if (tcph->ack)
2223 pkt_type = NES_PKT_TYPE_SYNACK;
2224 } else if (tcph->ack) {
2225 pkt_type = NES_PKT_TYPE_ACK;
2226 }
2227 if (tcph->fin)
2228 fin_set = 1;
2229
2230 switch (pkt_type) {
2231 case NES_PKT_TYPE_SYN:
2232 handle_syn_pkt(cm_node, skb, tcph);
2233 break;
2234 case NES_PKT_TYPE_SYNACK:
2235 handle_synack_pkt(cm_node, skb, tcph);
2236 break;
2237 case NES_PKT_TYPE_ACK:
2238 ret = handle_ack_pkt(cm_node, skb, tcph);
2239 if (fin_set && !ret)
2240 handle_fin_pkt(cm_node);
2241 break;
2242 case NES_PKT_TYPE_RST:
2243 handle_rst_pkt(cm_node, skb, tcph);
2244 break;
2245 default:
2246 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2247 handle_fin_pkt(cm_node);
2248 drop_packet(skb);
2249 break;
2250 }
2251 }
2252
2253 /**
2254 * mini_cm_listen - create a listen node with params
2255 */
2256 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2257 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2258 {
2259 struct nes_cm_listener *listener;
2260 unsigned long flags;
2261
2262 nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2263 cm_info->loc_addr, cm_info->loc_port);
2264
2265 /* cannot have multiple matching listeners */
2266 listener = find_listener(cm_core, cm_info->loc_addr, cm_info->loc_port,
2267 NES_CM_LISTENER_EITHER_STATE);
2268
2269 if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2270 /* find automatically incs ref count ??? */
2271 atomic_dec(&listener->ref_count);
2272 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2273 return NULL;
2274 }
2275
2276 if (!listener) {
2277 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2278 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2279 if (!listener)
2280 return NULL;
2281
2282 listener->loc_addr = cm_info->loc_addr;
2283 listener->loc_port = cm_info->loc_port;
2284 listener->reused_node = 0;
2285
2286 atomic_set(&listener->ref_count, 1);
2287 }
2288 /* pasive case */
2289 /* find already inc'ed the ref count */
2290 else {
2291 listener->reused_node = 1;
2292 }
2293
2294 listener->cm_id = cm_info->cm_id;
2295 atomic_set(&listener->pend_accepts_cnt, 0);
2296 listener->cm_core = cm_core;
2297 listener->nesvnic = nesvnic;
2298 atomic_inc(&cm_core->node_cnt);
2299
2300 listener->conn_type = cm_info->conn_type;
2301 listener->backlog = cm_info->backlog;
2302 listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2303
2304 if (!listener->reused_node) {
2305 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2306 list_add(&listener->list, &cm_core->listen_list.list);
2307 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2308 atomic_inc(&cm_core->listen_node_cnt);
2309 }
2310
2311 nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2312 " listener = %p, backlog = %d, cm_id = %p.\n",
2313 cm_info->loc_addr, cm_info->loc_port,
2314 listener, listener->backlog, listener->cm_id);
2315
2316 return listener;
2317 }
2318
2319
2320 /**
2321 * mini_cm_connect - make a connection node with params
2322 */
2323 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2324 struct nes_vnic *nesvnic, u16 private_data_len,
2325 void *private_data, struct nes_cm_info *cm_info)
2326 {
2327 int ret = 0;
2328 struct nes_cm_node *cm_node;
2329 struct nes_cm_listener *loopbackremotelistener;
2330 struct nes_cm_node *loopbackremotenode;
2331 struct nes_cm_info loopback_cm_info;
2332 u8 *start_buff;
2333
2334 /* create a CM connection node */
2335 cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2336 if (!cm_node)
2337 return NULL;
2338
2339 /* set our node side to client (active) side */
2340 cm_node->tcp_cntxt.client = 1;
2341 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2342
2343 if (cm_info->loc_addr == cm_info->rem_addr) {
2344 loopbackremotelistener = find_listener(cm_core,
2345 cm_node->loc_addr, cm_node->rem_port,
2346 NES_CM_LISTENER_ACTIVE_STATE);
2347 if (loopbackremotelistener == NULL) {
2348 create_event(cm_node, NES_CM_EVENT_ABORTED);
2349 } else {
2350 loopback_cm_info = *cm_info;
2351 loopback_cm_info.loc_port = cm_info->rem_port;
2352 loopback_cm_info.rem_port = cm_info->loc_port;
2353 loopback_cm_info.loc_port =
2354 cm_info->rem_port;
2355 loopback_cm_info.rem_port =
2356 cm_info->loc_port;
2357 loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2358 loopbackremotenode = make_cm_node(cm_core, nesvnic,
2359 &loopback_cm_info, loopbackremotelistener);
2360 if (!loopbackremotenode) {
2361 rem_ref_cm_node(cm_node->cm_core, cm_node);
2362 return NULL;
2363 }
2364 atomic_inc(&cm_loopbacks);
2365 loopbackremotenode->loopbackpartner = cm_node;
2366 loopbackremotenode->tcp_cntxt.rcv_wscale =
2367 NES_CM_DEFAULT_RCV_WND_SCALE;
2368 cm_node->loopbackpartner = loopbackremotenode;
2369 memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2370 private_data_len);
2371 loopbackremotenode->mpa_frame_size = private_data_len;
2372
2373 /* we are done handling this state. */
2374 /* set node to a TSA state */
2375 cm_node->state = NES_CM_STATE_TSA;
2376 cm_node->tcp_cntxt.rcv_nxt =
2377 loopbackremotenode->tcp_cntxt.loc_seq_num;
2378 loopbackremotenode->tcp_cntxt.rcv_nxt =
2379 cm_node->tcp_cntxt.loc_seq_num;
2380 cm_node->tcp_cntxt.max_snd_wnd =
2381 loopbackremotenode->tcp_cntxt.rcv_wnd;
2382 loopbackremotenode->tcp_cntxt.max_snd_wnd =
2383 cm_node->tcp_cntxt.rcv_wnd;
2384 cm_node->tcp_cntxt.snd_wnd =
2385 loopbackremotenode->tcp_cntxt.rcv_wnd;
2386 loopbackremotenode->tcp_cntxt.snd_wnd =
2387 cm_node->tcp_cntxt.rcv_wnd;
2388 cm_node->tcp_cntxt.snd_wscale =
2389 loopbackremotenode->tcp_cntxt.rcv_wscale;
2390 loopbackremotenode->tcp_cntxt.snd_wscale =
2391 cm_node->tcp_cntxt.rcv_wscale;
2392 loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2393 create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2394 }
2395 return cm_node;
2396 }
2397
2398 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2399 cm_node->mpa_frame_size = private_data_len;
2400
2401 memcpy(start_buff, private_data, private_data_len);
2402
2403 /* send a syn and goto syn sent state */
2404 cm_node->state = NES_CM_STATE_SYN_SENT;
2405 ret = send_syn(cm_node, 0, NULL);
2406
2407 if (ret) {
2408 /* error in sending the syn free up the cm_node struct */
2409 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2410 "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2411 cm_node->rem_addr, cm_node->rem_port, cm_node,
2412 cm_node->cm_id);
2413 rem_ref_cm_node(cm_node->cm_core, cm_node);
2414 cm_node = NULL;
2415 }
2416
2417 if (cm_node) {
2418 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2419 "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2420 cm_node->rem_addr, cm_node->rem_port, cm_node,
2421 cm_node->cm_id);
2422 }
2423
2424 return cm_node;
2425 }
2426
2427
2428 /**
2429 * mini_cm_accept - accept a connection
2430 * This function is never called
2431 */
2432 static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2433 {
2434 return 0;
2435 }
2436
2437
2438 /**
2439 * mini_cm_reject - reject and teardown a connection
2440 */
2441 static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2442 {
2443 int ret = 0;
2444 int err = 0;
2445 int passive_state;
2446 struct nes_cm_event event;
2447 struct iw_cm_id *cm_id = cm_node->cm_id;
2448 struct nes_cm_node *loopback = cm_node->loopbackpartner;
2449
2450 nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2451 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2452
2453 if (cm_node->tcp_cntxt.client)
2454 return ret;
2455 cleanup_retrans_entry(cm_node);
2456
2457 if (!loopback) {
2458 passive_state = atomic_add_return(1, &cm_node->passive_state);
2459 if (passive_state == NES_SEND_RESET_EVENT) {
2460 cm_node->state = NES_CM_STATE_CLOSED;
2461 rem_ref_cm_node(cm_core, cm_node);
2462 } else {
2463 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2464 rem_ref_cm_node(cm_core, cm_node);
2465 } else {
2466 ret = send_mpa_reject(cm_node);
2467 if (ret) {
2468 cm_node->state = NES_CM_STATE_CLOSED;
2469 err = send_reset(cm_node, NULL);
2470 if (err)
2471 WARN_ON(1);
2472 } else {
2473 cm_id->add_ref(cm_id);
2474 }
2475 }
2476 }
2477 } else {
2478 cm_node->cm_id = NULL;
2479 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2480 rem_ref_cm_node(cm_core, cm_node);
2481 rem_ref_cm_node(cm_core, loopback);
2482 } else {
2483 event.cm_node = loopback;
2484 event.cm_info.rem_addr = loopback->rem_addr;
2485 event.cm_info.loc_addr = loopback->loc_addr;
2486 event.cm_info.rem_port = loopback->rem_port;
2487 event.cm_info.loc_port = loopback->loc_port;
2488 event.cm_info.cm_id = loopback->cm_id;
2489 cm_event_mpa_reject(&event);
2490 rem_ref_cm_node(cm_core, cm_node);
2491 loopback->state = NES_CM_STATE_CLOSING;
2492
2493 cm_id = loopback->cm_id;
2494 rem_ref_cm_node(cm_core, loopback);
2495 cm_id->rem_ref(cm_id);
2496 }
2497 }
2498
2499 return ret;
2500 }
2501
2502
2503 /**
2504 * mini_cm_close
2505 */
2506 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2507 {
2508 int ret = 0;
2509
2510 if (!cm_core || !cm_node)
2511 return -EINVAL;
2512
2513 switch (cm_node->state) {
2514 case NES_CM_STATE_SYN_RCVD:
2515 case NES_CM_STATE_SYN_SENT:
2516 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2517 case NES_CM_STATE_ESTABLISHED:
2518 case NES_CM_STATE_ACCEPTING:
2519 case NES_CM_STATE_MPAREQ_SENT:
2520 case NES_CM_STATE_MPAREQ_RCVD:
2521 cleanup_retrans_entry(cm_node);
2522 send_reset(cm_node, NULL);
2523 break;
2524 case NES_CM_STATE_CLOSE_WAIT:
2525 cm_node->state = NES_CM_STATE_LAST_ACK;
2526 send_fin(cm_node, NULL);
2527 break;
2528 case NES_CM_STATE_FIN_WAIT1:
2529 case NES_CM_STATE_FIN_WAIT2:
2530 case NES_CM_STATE_LAST_ACK:
2531 case NES_CM_STATE_TIME_WAIT:
2532 case NES_CM_STATE_CLOSING:
2533 ret = -1;
2534 break;
2535 case NES_CM_STATE_LISTENING:
2536 cleanup_retrans_entry(cm_node);
2537 send_reset(cm_node, NULL);
2538 break;
2539 case NES_CM_STATE_MPAREJ_RCVD:
2540 case NES_CM_STATE_UNKNOWN:
2541 case NES_CM_STATE_INITED:
2542 case NES_CM_STATE_CLOSED:
2543 case NES_CM_STATE_LISTENER_DESTROYED:
2544 ret = rem_ref_cm_node(cm_core, cm_node);
2545 break;
2546 case NES_CM_STATE_TSA:
2547 if (cm_node->send_entry)
2548 printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2549 "send_entry=%p\n", cm_node->send_entry);
2550 ret = rem_ref_cm_node(cm_core, cm_node);
2551 break;
2552 }
2553 return ret;
2554 }
2555
2556
2557 /**
2558 * recv_pkt - recv an ETHERNET packet, and process it through CM
2559 * node state machine
2560 */
2561 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2562 struct nes_vnic *nesvnic, struct sk_buff *skb)
2563 {
2564 struct nes_cm_node *cm_node = NULL;
2565 struct nes_cm_listener *listener = NULL;
2566 struct iphdr *iph;
2567 struct tcphdr *tcph;
2568 struct nes_cm_info nfo;
2569 int skb_handled = 1;
2570 __be32 tmp_daddr, tmp_saddr;
2571
2572 if (!skb)
2573 return 0;
2574 if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2575 return 0;
2576
2577 iph = (struct iphdr *)skb->data;
2578 tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2579
2580 nfo.loc_addr = ntohl(iph->daddr);
2581 nfo.loc_port = ntohs(tcph->dest);
2582 nfo.rem_addr = ntohl(iph->saddr);
2583 nfo.rem_port = ntohs(tcph->source);
2584
2585 tmp_daddr = cpu_to_be32(iph->daddr);
2586 tmp_saddr = cpu_to_be32(iph->saddr);
2587
2588 nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2589 &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2590
2591 do {
2592 cm_node = find_node(cm_core,
2593 nfo.rem_port, nfo.rem_addr,
2594 nfo.loc_port, nfo.loc_addr);
2595
2596 if (!cm_node) {
2597 /* Only type of packet accepted are for */
2598 /* the PASSIVE open (syn only) */
2599 if ((!tcph->syn) || (tcph->ack)) {
2600 skb_handled = 0;
2601 break;
2602 }
2603 listener = find_listener(cm_core, nfo.loc_addr,
2604 nfo.loc_port,
2605 NES_CM_LISTENER_ACTIVE_STATE);
2606 if (!listener) {
2607 nfo.cm_id = NULL;
2608 nfo.conn_type = 0;
2609 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2610 skb_handled = 0;
2611 break;
2612 }
2613 nfo.cm_id = listener->cm_id;
2614 nfo.conn_type = listener->conn_type;
2615 cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2616 listener);
2617 if (!cm_node) {
2618 nes_debug(NES_DBG_CM, "Unable to allocate "
2619 "node\n");
2620 cm_packets_dropped++;
2621 atomic_dec(&listener->ref_count);
2622 dev_kfree_skb_any(skb);
2623 break;
2624 }
2625 if (!tcph->rst && !tcph->fin) {
2626 cm_node->state = NES_CM_STATE_LISTENING;
2627 } else {
2628 cm_packets_dropped++;
2629 rem_ref_cm_node(cm_core, cm_node);
2630 dev_kfree_skb_any(skb);
2631 break;
2632 }
2633 add_ref_cm_node(cm_node);
2634 } else if (cm_node->state == NES_CM_STATE_TSA) {
2635 if (cm_node->nesqp->pau_mode)
2636 nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2637 else {
2638 rem_ref_cm_node(cm_core, cm_node);
2639 atomic_inc(&cm_accel_dropped_pkts);
2640 dev_kfree_skb_any(skb);
2641 }
2642 break;
2643 }
2644 skb_reset_network_header(skb);
2645 skb_set_transport_header(skb, sizeof(*tcph));
2646 skb->len = ntohs(iph->tot_len);
2647 process_packet(cm_node, skb, cm_core);
2648 rem_ref_cm_node(cm_core, cm_node);
2649 } while (0);
2650 return skb_handled;
2651 }
2652
2653
2654 /**
2655 * nes_cm_alloc_core - allocate a top level instance of a cm core
2656 */
2657 static struct nes_cm_core *nes_cm_alloc_core(void)
2658 {
2659 struct nes_cm_core *cm_core;
2660
2661 /* setup the CM core */
2662 /* alloc top level core control structure */
2663 cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2664 if (!cm_core)
2665 return NULL;
2666
2667 INIT_LIST_HEAD(&cm_core->connected_nodes);
2668 timer_setup(&cm_core->tcp_timer, nes_cm_timer_tick, 0);
2669
2670 cm_core->mtu = NES_CM_DEFAULT_MTU;
2671 cm_core->state = NES_CM_STATE_INITED;
2672 cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2673
2674 atomic_set(&cm_core->events_posted, 0);
2675
2676 cm_core->api = &nes_cm_api;
2677
2678 spin_lock_init(&cm_core->ht_lock);
2679 spin_lock_init(&cm_core->listen_list_lock);
2680
2681 INIT_LIST_HEAD(&cm_core->listen_list.list);
2682
2683 nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2684
2685 nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2686 cm_core->event_wq = alloc_ordered_workqueue("nesewq", 0);
2687 if (!cm_core->event_wq)
2688 goto out_free_cmcore;
2689 cm_core->post_event = nes_cm_post_event;
2690 nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2691 cm_core->disconn_wq = alloc_ordered_workqueue("nesdwq", 0);
2692 if (!cm_core->disconn_wq)
2693 goto out_free_wq;
2694
2695 print_core(cm_core);
2696 return cm_core;
2697
2698 out_free_wq:
2699 destroy_workqueue(cm_core->event_wq);
2700 out_free_cmcore:
2701 kfree(cm_core);
2702 return NULL;
2703 }
2704
2705
2706 /**
2707 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2708 */
2709 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2710 {
2711 nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2712
2713 if (!cm_core)
2714 return -EINVAL;
2715
2716 barrier();
2717
2718 if (timer_pending(&cm_core->tcp_timer))
2719 del_timer(&cm_core->tcp_timer);
2720
2721 destroy_workqueue(cm_core->event_wq);
2722 destroy_workqueue(cm_core->disconn_wq);
2723 nes_debug(NES_DBG_CM, "\n");
2724 kfree(cm_core);
2725
2726 return 0;
2727 }
2728
2729
2730 /**
2731 * mini_cm_get
2732 */
2733 static int mini_cm_get(struct nes_cm_core *cm_core)
2734 {
2735 return cm_core->state;
2736 }
2737
2738
2739 /**
2740 * mini_cm_set
2741 */
2742 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2743 {
2744 int ret = 0;
2745
2746 switch (type) {
2747 case NES_CM_SET_PKT_SIZE:
2748 cm_core->mtu = value;
2749 break;
2750 case NES_CM_SET_FREE_PKT_Q_SIZE:
2751 cm_core->free_tx_pkt_max = value;
2752 break;
2753 default:
2754 /* unknown set option */
2755 ret = -EINVAL;
2756 }
2757
2758 return ret;
2759 }
2760
2761
2762 /**
2763 * nes_cm_init_tsa_conn setup HW; MPA frames must be
2764 * successfully exchanged when this is called
2765 */
2766 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2767 {
2768 int ret = 0;
2769
2770 if (!nesqp)
2771 return -EINVAL;
2772
2773 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2774 NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2775 NES_QPCONTEXT_MISC_DROS);
2776
2777 if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2778 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2779
2780 nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2781
2782 nesqp->nesqp_context->misc2 |= cpu_to_le32(
2783 cm_node->tos << NES_QPCONTEXT_MISC2_TOS_SHIFT);
2784
2785 nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2786
2787 nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2788 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2789
2790 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2791 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2792 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2793
2794 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2795 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2796 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2797
2798 nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2799 nesqp->nesqp_context->ts_recent = 0;
2800 nesqp->nesqp_context->ts_age = 0;
2801 nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2802 nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2803 nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2804 nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2805 cm_node->tcp_cntxt.rcv_wscale);
2806 nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2807 nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2808 nesqp->nesqp_context->srtt = 0;
2809 nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2810 nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2811 nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2812 nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2813 nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2814 nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2815
2816 nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2817 " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2818 nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2819 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2820 cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2821 le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2822 le32_to_cpu(nesqp->nesqp_context->misc));
2823 nes_debug(NES_DBG_CM, " snd_wnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2824 nes_debug(NES_DBG_CM, " snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2825 nes_debug(NES_DBG_CM, " max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2826
2827 nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2828 cm_node->state = NES_CM_STATE_TSA;
2829
2830 return ret;
2831 }
2832
2833
2834 /**
2835 * nes_cm_disconn
2836 */
2837 int nes_cm_disconn(struct nes_qp *nesqp)
2838 {
2839 struct disconn_work *work;
2840
2841 work = kzalloc(sizeof *work, GFP_ATOMIC);
2842 if (!work)
2843 return -ENOMEM; /* Timer will clean up */
2844
2845 nes_add_ref(&nesqp->ibqp);
2846 work->nesqp = nesqp;
2847 INIT_WORK(&work->work, nes_disconnect_worker);
2848 queue_work(g_cm_core->disconn_wq, &work->work);
2849 return 0;
2850 }
2851
2852
2853 /**
2854 * nes_disconnect_worker
2855 */
2856 static void nes_disconnect_worker(struct work_struct *work)
2857 {
2858 struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2859 struct nes_qp *nesqp = dwork->nesqp;
2860
2861 kfree(dwork);
2862 nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2863 nesqp->last_aeq, nesqp->hwqp.qp_id);
2864 nes_cm_disconn_true(nesqp);
2865 nes_rem_ref(&nesqp->ibqp);
2866 }
2867
2868
2869 /**
2870 * nes_cm_disconn_true
2871 */
2872 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2873 {
2874 unsigned long flags;
2875 int ret = 0;
2876 struct iw_cm_id *cm_id;
2877 struct iw_cm_event cm_event;
2878 struct nes_vnic *nesvnic;
2879 u16 last_ae;
2880 u8 original_hw_tcp_state;
2881 u8 original_ibqp_state;
2882 int disconn_status = 0;
2883 int issue_disconn = 0;
2884 int issue_close = 0;
2885 int issue_flush = 0;
2886 u32 flush_q = NES_CQP_FLUSH_RQ;
2887 struct ib_event ibevent;
2888
2889 if (!nesqp) {
2890 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2891 return -1;
2892 }
2893
2894 spin_lock_irqsave(&nesqp->lock, flags);
2895 cm_id = nesqp->cm_id;
2896 /* make sure we havent already closed this connection */
2897 if (!cm_id) {
2898 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2899 nesqp->hwqp.qp_id);
2900 spin_unlock_irqrestore(&nesqp->lock, flags);
2901 return -1;
2902 }
2903
2904 nesvnic = to_nesvnic(nesqp->ibqp.device);
2905 nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2906
2907 original_hw_tcp_state = nesqp->hw_tcp_state;
2908 original_ibqp_state = nesqp->ibqp_state;
2909 last_ae = nesqp->last_aeq;
2910
2911 if (nesqp->term_flags) {
2912 issue_disconn = 1;
2913 issue_close = 1;
2914 nesqp->cm_id = NULL;
2915 del_timer(&nesqp->terminate_timer);
2916 if (nesqp->flush_issued == 0) {
2917 nesqp->flush_issued = 1;
2918 issue_flush = 1;
2919 }
2920 } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2921 ((original_ibqp_state == IB_QPS_RTS) &&
2922 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2923 issue_disconn = 1;
2924 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2925 disconn_status = -ECONNRESET;
2926 }
2927
2928 if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2929 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2930 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2931 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2932 issue_close = 1;
2933 nesqp->cm_id = NULL;
2934 if (nesqp->flush_issued == 0) {
2935 nesqp->flush_issued = 1;
2936 issue_flush = 1;
2937 }
2938 }
2939
2940 spin_unlock_irqrestore(&nesqp->lock, flags);
2941
2942 if ((issue_flush) && (nesqp->destroyed == 0)) {
2943 /* Flush the queue(s) */
2944 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2945 flush_q |= NES_CQP_FLUSH_SQ;
2946 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2947
2948 if (nesqp->term_flags) {
2949 ibevent.device = nesqp->ibqp.device;
2950 ibevent.event = nesqp->terminate_eventtype;
2951 ibevent.element.qp = &nesqp->ibqp;
2952 if (nesqp->ibqp.event_handler)
2953 nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2954 }
2955 }
2956
2957 if ((cm_id) && (cm_id->event_handler)) {
2958 if (issue_disconn) {
2959 atomic_inc(&cm_disconnects);
2960 cm_event.event = IW_CM_EVENT_DISCONNECT;
2961 cm_event.status = disconn_status;
2962 cm_event.local_addr = cm_id->m_local_addr;
2963 cm_event.remote_addr = cm_id->m_remote_addr;
2964 cm_event.private_data = NULL;
2965 cm_event.private_data_len = 0;
2966
2967 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2968 " for QP%u, SQ Head = %u, SQ Tail = %u. "
2969 "cm_id = %p, refcount = %u.\n",
2970 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2971 nesqp->hwqp.sq_tail, cm_id,
2972 atomic_read(&nesqp->refcount));
2973
2974 ret = cm_id->event_handler(cm_id, &cm_event);
2975 if (ret)
2976 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2977 "returned, ret=%d\n", ret);
2978 }
2979
2980 if (issue_close) {
2981 atomic_inc(&cm_closes);
2982 nes_disconnect(nesqp, 1);
2983
2984 cm_id->provider_data = nesqp;
2985 /* Send up the close complete event */
2986 cm_event.event = IW_CM_EVENT_CLOSE;
2987 cm_event.status = 0;
2988 cm_event.provider_data = cm_id->provider_data;
2989 cm_event.local_addr = cm_id->m_local_addr;
2990 cm_event.remote_addr = cm_id->m_remote_addr;
2991 cm_event.private_data = NULL;
2992 cm_event.private_data_len = 0;
2993
2994 ret = cm_id->event_handler(cm_id, &cm_event);
2995 if (ret)
2996 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2997
2998 cm_id->rem_ref(cm_id);
2999 }
3000 }
3001
3002 return 0;
3003 }
3004
3005
3006 /**
3007 * nes_disconnect
3008 */
3009 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
3010 {
3011 int ret = 0;
3012 struct nes_vnic *nesvnic;
3013 struct nes_device *nesdev;
3014 struct nes_ib_device *nesibdev;
3015
3016 nesvnic = to_nesvnic(nesqp->ibqp.device);
3017 if (!nesvnic)
3018 return -EINVAL;
3019
3020 nesdev = nesvnic->nesdev;
3021 nesibdev = nesvnic->nesibdev;
3022
3023 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3024 netdev_refcnt_read(nesvnic->netdev));
3025
3026 if (nesqp->active_conn) {
3027
3028 /* indicate this connection is NOT active */
3029 nesqp->active_conn = 0;
3030 } else {
3031 /* Need to free the Last Streaming Mode Message */
3032 if (nesqp->ietf_frame) {
3033 if (nesqp->lsmm_mr)
3034 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
3035 pci_free_consistent(nesdev->pcidev,
3036 nesqp->private_data_len + nesqp->ietf_frame_size,
3037 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3038 }
3039 }
3040
3041 /* close the CM node down if it is still active */
3042 if (nesqp->cm_node) {
3043 nes_debug(NES_DBG_CM, "Call close API\n");
3044
3045 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
3046 }
3047
3048 return ret;
3049 }
3050
3051
3052 /**
3053 * nes_accept
3054 */
3055 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3056 {
3057 u64 u64temp;
3058 struct ib_qp *ibqp;
3059 struct nes_qp *nesqp;
3060 struct nes_vnic *nesvnic;
3061 struct nes_device *nesdev;
3062 struct nes_cm_node *cm_node;
3063 struct nes_adapter *adapter;
3064 struct ib_qp_attr attr;
3065 struct iw_cm_event cm_event;
3066 struct nes_hw_qp_wqe *wqe;
3067 struct nes_v4_quad nes_quad;
3068 u32 crc_value;
3069 int ret;
3070 int passive_state;
3071 struct ib_mr *ibmr = NULL;
3072 struct nes_pd *nespd;
3073 u64 tagged_offset;
3074 u8 mpa_frame_offset = 0;
3075 struct ietf_mpa_v2 *mpa_v2_frame;
3076 u8 start_addr = 0;
3077 u8 *start_ptr = &start_addr;
3078 u8 **start_buff = &start_ptr;
3079 u16 buff_len = 0;
3080 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3081 struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3082
3083 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3084 if (!ibqp)
3085 return -EINVAL;
3086
3087 /* get all our handles */
3088 nesqp = to_nesqp(ibqp);
3089 nesvnic = to_nesvnic(nesqp->ibqp.device);
3090 nesdev = nesvnic->nesdev;
3091 adapter = nesdev->nesadapter;
3092
3093 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3094 nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3095 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3096 nesvnic->netdev->name);
3097
3098 if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3099 if (cm_node->loopbackpartner)
3100 rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3101 rem_ref_cm_node(cm_node->cm_core, cm_node);
3102 return -EINVAL;
3103 }
3104
3105 passive_state = atomic_add_return(1, &cm_node->passive_state);
3106 if (passive_state == NES_SEND_RESET_EVENT) {
3107 rem_ref_cm_node(cm_node->cm_core, cm_node);
3108 return -ECONNRESET;
3109 }
3110 /* associate the node with the QP */
3111 nesqp->cm_node = (void *)cm_node;
3112 cm_node->nesqp = nesqp;
3113
3114
3115 nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3116 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3117 atomic_inc(&cm_accepts);
3118
3119 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3120 netdev_refcnt_read(nesvnic->netdev));
3121
3122 nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3123 /* allocate the ietf frame and space for private data */
3124 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3125 nesqp->ietf_frame_size + conn_param->private_data_len,
3126 &nesqp->ietf_frame_pbase);
3127
3128 if (!nesqp->ietf_frame) {
3129 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3130 return -ENOMEM;
3131 }
3132 mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3133
3134 if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3135 mpa_frame_offset = 4;
3136
3137 if (cm_node->mpa_frame_rev == IETF_MPA_V1 ||
3138 cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
3139 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3140 }
3141
3142 memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3143 conn_param->private_data_len);
3144
3145 cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3146 nesqp->private_data_len = conn_param->private_data_len;
3147
3148 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3149 wqe = &nesqp->hwqp.sq_vbase[0];
3150
3151 if (raddr->sin_addr.s_addr != laddr->sin_addr.s_addr) {
3152 u64temp = (unsigned long)nesqp;
3153 nespd = nesqp->nespd;
3154 tagged_offset = (u64)(unsigned long)*start_buff;
3155 ibmr = nes_reg_phys_mr(&nespd->ibpd,
3156 nesqp->ietf_frame_pbase + mpa_frame_offset,
3157 buff_len, IB_ACCESS_LOCAL_WRITE,
3158 &tagged_offset);
3159 if (IS_ERR(ibmr)) {
3160 nes_debug(NES_DBG_CM, "Unable to register memory region"
3161 "for lSMM for cm_node = %p \n",
3162 cm_node);
3163 pci_free_consistent(nesdev->pcidev,
3164 nesqp->private_data_len + nesqp->ietf_frame_size,
3165 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3166 return PTR_ERR(ibmr);
3167 }
3168
3169 ibmr->pd = &nespd->ibpd;
3170 ibmr->device = nespd->ibpd.device;
3171 nesqp->lsmm_mr = ibmr;
3172
3173 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3174 set_wqe_64bit_value(wqe->wqe_words,
3175 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3176 u64temp);
3177 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3178 cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3179 NES_IWARP_SQ_WQE_WRPDU);
3180 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3181 cpu_to_le32(buff_len);
3182 set_wqe_64bit_value(wqe->wqe_words,
3183 NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3184 (u64)(unsigned long)(*start_buff));
3185 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3186 cpu_to_le32(buff_len);
3187 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3188 if (nesqp->sq_kmapped) {
3189 nesqp->sq_kmapped = 0;
3190 kunmap(nesqp->page);
3191 }
3192
3193 nesqp->nesqp_context->ird_ord_sizes |=
3194 cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3195 NES_QPCONTEXT_ORDIRD_WRPDU);
3196 } else {
3197 nesqp->nesqp_context->ird_ord_sizes |=
3198 cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3199 }
3200 nesqp->skip_lsmm = 1;
3201
3202 /* Cache the cm_id in the qp */
3203 nesqp->cm_id = cm_id;
3204 cm_node->cm_id = cm_id;
3205
3206 /* nesqp->cm_node = (void *)cm_id->provider_data; */
3207 cm_id->provider_data = nesqp;
3208 nesqp->active_conn = 0;
3209
3210 if (cm_node->state == NES_CM_STATE_TSA)
3211 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3212 cm_node);
3213
3214 nes_cm_init_tsa_conn(nesqp, cm_node);
3215
3216 nesqp->nesqp_context->tcpPorts[0] =
3217 cpu_to_le16(cm_node->loc_port);
3218 nesqp->nesqp_context->tcpPorts[1] =
3219 cpu_to_le16(cm_node->rem_port);
3220
3221 nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->rem_addr);
3222
3223 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3224 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3225 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3226
3227 nesqp->nesqp_context->arp_index_vlan |=
3228 cpu_to_le32(nes_arp_table(nesdev,
3229 le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3230 NES_ARP_RESOLVE) << 16);
3231
3232 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3233 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3234
3235 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3236
3237 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3238 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3239 nesqp->nesqp_context->ird_ord_sizes |=
3240 cpu_to_le32((u32)cm_node->ord_size);
3241
3242 memset(&nes_quad, 0, sizeof(nes_quad));
3243 nes_quad.DstIpAdrIndex =
3244 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3245 nes_quad.SrcIpadr = htonl(cm_node->rem_addr);
3246 nes_quad.TcpPorts[0] = htons(cm_node->rem_port);
3247 nes_quad.TcpPorts[1] = htons(cm_node->loc_port);
3248
3249 /* Produce hash key */
3250 crc_value = get_crc_value(&nes_quad);
3251 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3252 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3253 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3254
3255 nesqp->hte_index &= adapter->hte_index_mask;
3256 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3257
3258 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3259
3260 nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3261 "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3262 "private data length=%u.\n", nesqp->hwqp.qp_id,
3263 ntohl(raddr->sin_addr.s_addr), ntohs(raddr->sin_port),
3264 ntohl(laddr->sin_addr.s_addr), ntohs(laddr->sin_port),
3265 le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3266 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3267 buff_len);
3268
3269 /* notify OF layer that accept event was successful */
3270 cm_id->add_ref(cm_id);
3271 nes_add_ref(&nesqp->ibqp);
3272
3273 cm_event.event = IW_CM_EVENT_ESTABLISHED;
3274 cm_event.status = 0;
3275 cm_event.provider_data = (void *)nesqp;
3276 cm_event.local_addr = cm_id->m_local_addr;
3277 cm_event.remote_addr = cm_id->m_remote_addr;
3278 cm_event.private_data = NULL;
3279 cm_event.private_data_len = 0;
3280 cm_event.ird = cm_node->ird_size;
3281 cm_event.ord = cm_node->ord_size;
3282
3283 ret = cm_id->event_handler(cm_id, &cm_event);
3284 attr.qp_state = IB_QPS_RTS;
3285 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3286 if (cm_node->loopbackpartner) {
3287 cm_node->loopbackpartner->mpa_frame_size =
3288 nesqp->private_data_len;
3289 /* copy entire MPA frame to our cm_node's frame */
3290 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3291 conn_param->private_data, conn_param->private_data_len);
3292 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3293 }
3294 if (ret)
3295 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3296 "ret=%d\n", __func__, __LINE__, ret);
3297
3298 return 0;
3299 }
3300
3301
3302 /**
3303 * nes_reject
3304 */
3305 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3306 {
3307 struct nes_cm_node *cm_node;
3308 struct nes_cm_node *loopback;
3309 struct nes_cm_core *cm_core;
3310 u8 *start_buff;
3311
3312 atomic_inc(&cm_rejects);
3313 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3314 loopback = cm_node->loopbackpartner;
3315 cm_core = cm_node->cm_core;
3316 cm_node->cm_id = cm_id;
3317
3318 if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3319 return -EINVAL;
3320
3321 if (loopback) {
3322 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3323 loopback->mpa_frame.priv_data_len = pdata_len;
3324 loopback->mpa_frame_size = pdata_len;
3325 } else {
3326 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3327 cm_node->mpa_frame_size = pdata_len;
3328 memcpy(start_buff, pdata, pdata_len);
3329 }
3330 return cm_core->api->reject(cm_core, cm_node);
3331 }
3332
3333
3334 /**
3335 * nes_connect
3336 * setup and launch cm connect node
3337 */
3338 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3339 {
3340 struct ib_qp *ibqp;
3341 struct nes_qp *nesqp;
3342 struct nes_vnic *nesvnic;
3343 struct nes_device *nesdev;
3344 struct nes_cm_node *cm_node;
3345 struct nes_cm_info cm_info;
3346 int apbvt_set = 0;
3347 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3348 struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3349
3350 if (cm_id->remote_addr.ss_family != AF_INET)
3351 return -ENOSYS;
3352 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3353 if (!ibqp)
3354 return -EINVAL;
3355 nesqp = to_nesqp(ibqp);
3356 if (!nesqp)
3357 return -EINVAL;
3358 nesvnic = to_nesvnic(nesqp->ibqp.device);
3359 if (!nesvnic)
3360 return -EINVAL;
3361 nesdev = nesvnic->nesdev;
3362 if (!nesdev)
3363 return -EINVAL;
3364
3365 if (!laddr->sin_port || !raddr->sin_port)
3366 return -EINVAL;
3367
3368 nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3369 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3370 ntohl(nesvnic->local_ipaddr), ntohl(raddr->sin_addr.s_addr),
3371 ntohs(raddr->sin_port), ntohl(laddr->sin_addr.s_addr),
3372 ntohs(laddr->sin_port));
3373
3374 atomic_inc(&cm_connects);
3375 nesqp->active_conn = 1;
3376
3377 /* cache the cm_id in the qp */
3378 nesqp->cm_id = cm_id;
3379 cm_id->provider_data = nesqp;
3380 nesqp->private_data_len = conn_param->private_data_len;
3381
3382 nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3383 nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3384 conn_param->private_data_len);
3385
3386 /* set up the connection params for the node */
3387 cm_info.loc_addr = ntohl(laddr->sin_addr.s_addr);
3388 cm_info.loc_port = ntohs(laddr->sin_port);
3389 cm_info.rem_addr = ntohl(raddr->sin_addr.s_addr);
3390 cm_info.rem_port = ntohs(raddr->sin_port);
3391 cm_info.cm_id = cm_id;
3392 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3393
3394 if (laddr->sin_addr.s_addr != raddr->sin_addr.s_addr) {
3395 nes_manage_apbvt(nesvnic, cm_info.loc_port,
3396 PCI_FUNC(nesdev->pcidev->devfn),
3397 NES_MANAGE_APBVT_ADD);
3398 apbvt_set = 1;
3399 }
3400
3401 cm_id->add_ref(cm_id);
3402
3403 /* create a connect CM node connection */
3404 cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3405 conn_param->private_data_len, (void *)conn_param->private_data,
3406 &cm_info);
3407 if (!cm_node) {
3408 if (apbvt_set)
3409 nes_manage_apbvt(nesvnic, cm_info.loc_port,
3410 PCI_FUNC(nesdev->pcidev->devfn),
3411 NES_MANAGE_APBVT_DEL);
3412
3413 nes_debug(NES_DBG_NLMSG, "Delete loc_port = %04X\n",
3414 cm_info.loc_port);
3415 cm_id->rem_ref(cm_id);
3416 return -ENOMEM;
3417 }
3418
3419 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3420 if (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO &&
3421 cm_node->ord_size == 0)
3422 cm_node->ord_size = 1;
3423
3424 cm_node->apbvt_set = apbvt_set;
3425 cm_node->tos = cm_id->tos;
3426 nesqp->cm_node = cm_node;
3427 cm_node->nesqp = nesqp;
3428 nes_add_ref(&nesqp->ibqp);
3429
3430 return 0;
3431 }
3432
3433
3434 /**
3435 * nes_create_listen
3436 */
3437 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3438 {
3439 struct nes_vnic *nesvnic;
3440 struct nes_cm_listener *cm_node;
3441 struct nes_cm_info cm_info;
3442 int err;
3443 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3444
3445 nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3446 cm_id, ntohs(laddr->sin_port));
3447
3448 if (cm_id->m_local_addr.ss_family != AF_INET)
3449 return -ENOSYS;
3450 nesvnic = to_nesvnic(cm_id->device);
3451 if (!nesvnic)
3452 return -EINVAL;
3453
3454 nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3455 nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3456
3457 nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3458 nesvnic->local_ipaddr, laddr->sin_addr.s_addr);
3459
3460 /* setup listen params in our api call struct */
3461 cm_info.loc_addr = ntohl(nesvnic->local_ipaddr);
3462 cm_info.loc_port = ntohs(laddr->sin_port);
3463 cm_info.backlog = backlog;
3464 cm_info.cm_id = cm_id;
3465
3466 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3467
3468 cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3469 if (!cm_node) {
3470 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3471 __func__, __LINE__);
3472 return -ENOMEM;
3473 }
3474
3475 cm_id->provider_data = cm_node;
3476 cm_node->tos = cm_id->tos;
3477
3478 if (!cm_node->reused_node) {
3479 err = nes_manage_apbvt(nesvnic, cm_node->loc_port,
3480 PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3481 NES_MANAGE_APBVT_ADD);
3482 if (err) {
3483 printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3484 err);
3485 g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3486 return err;
3487 }
3488 atomic_inc(&cm_listens_created);
3489 }
3490
3491 cm_id->add_ref(cm_id);
3492 cm_id->provider_data = (void *)cm_node;
3493
3494
3495 return 0;
3496 }
3497
3498
3499 /**
3500 * nes_destroy_listen
3501 */
3502 int nes_destroy_listen(struct iw_cm_id *cm_id)
3503 {
3504 if (cm_id->provider_data)
3505 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3506 else
3507 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3508
3509 cm_id->rem_ref(cm_id);
3510
3511 return 0;
3512 }
3513
3514
3515 /**
3516 * nes_cm_recv
3517 */
3518 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3519 {
3520 int rc = 0;
3521
3522 cm_packets_received++;
3523 if ((g_cm_core) && (g_cm_core->api))
3524 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3525 else
3526 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3527 " cm is not setup properly.\n");
3528
3529 return rc;
3530 }
3531
3532
3533 /**
3534 * nes_cm_start
3535 * Start and init a cm core module
3536 */
3537 int nes_cm_start(void)
3538 {
3539 nes_debug(NES_DBG_CM, "\n");
3540 /* create the primary CM core, pass this handle to subsequent core inits */
3541 g_cm_core = nes_cm_alloc_core();
3542 if (g_cm_core)
3543 return 0;
3544 else
3545 return -ENOMEM;
3546 }
3547
3548
3549 /**
3550 * nes_cm_stop
3551 * stop and dealloc all cm core instances
3552 */
3553 int nes_cm_stop(void)
3554 {
3555 g_cm_core->api->destroy_cm_core(g_cm_core);
3556 return 0;
3557 }
3558
3559
3560 /**
3561 * cm_event_connected
3562 * handle a connected event, setup QPs and HW
3563 */
3564 static void cm_event_connected(struct nes_cm_event *event)
3565 {
3566 struct nes_qp *nesqp;
3567 struct nes_vnic *nesvnic;
3568 struct nes_device *nesdev;
3569 struct nes_cm_node *cm_node;
3570 struct nes_adapter *nesadapter;
3571 struct ib_qp_attr attr;
3572 struct iw_cm_id *cm_id;
3573 struct iw_cm_event cm_event;
3574 struct nes_v4_quad nes_quad;
3575 u32 crc_value;
3576 int ret;
3577 struct sockaddr_in *laddr;
3578 struct sockaddr_in *raddr;
3579 struct sockaddr_in *cm_event_laddr;
3580
3581 /* get all our handles */
3582 cm_node = event->cm_node;
3583 cm_id = cm_node->cm_id;
3584 nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3585 nesqp = (struct nes_qp *)cm_id->provider_data;
3586 nesvnic = to_nesvnic(nesqp->ibqp.device);
3587 nesdev = nesvnic->nesdev;
3588 nesadapter = nesdev->nesadapter;
3589 laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3590 raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3591 cm_event_laddr = (struct sockaddr_in *)&cm_event.local_addr;
3592
3593 if (nesqp->destroyed)
3594 return;
3595 atomic_inc(&cm_connecteds);
3596 nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
3597 " local port 0x%04X. jiffies = %lu.\n",
3598 nesqp->hwqp.qp_id, ntohl(raddr->sin_addr.s_addr),
3599 ntohs(raddr->sin_port), ntohs(laddr->sin_port), jiffies);
3600
3601 nes_cm_init_tsa_conn(nesqp, cm_node);
3602
3603 /* set the QP tsa context */
3604 nesqp->nesqp_context->tcpPorts[0] =
3605 cpu_to_le16(cm_node->loc_port);
3606 nesqp->nesqp_context->tcpPorts[1] =
3607 cpu_to_le16(cm_node->rem_port);
3608 nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->rem_addr);
3609
3610 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3611 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3612 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3613 nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3614 nes_arp_table(nesdev,
3615 le32_to_cpu(nesqp->nesqp_context->ip0),
3616 NULL, NES_ARP_RESOLVE) << 16);
3617 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3618 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3619 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3620 nesqp->nesqp_context->ird_ord_sizes |=
3621 cpu_to_le32((u32)1 <<
3622 NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3623 nesqp->nesqp_context->ird_ord_sizes |=
3624 cpu_to_le32((u32)cm_node->ord_size);
3625
3626 /* Adjust tail for not having a LSMM */
3627 /*nesqp->hwqp.sq_tail = 1;*/
3628
3629 build_rdma0_msg(cm_node, &nesqp);
3630
3631 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3632 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3633
3634 memset(&nes_quad, 0, sizeof(nes_quad));
3635
3636 nes_quad.DstIpAdrIndex =
3637 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3638 nes_quad.SrcIpadr = htonl(cm_node->rem_addr);
3639 nes_quad.TcpPorts[0] = htons(cm_node->rem_port);
3640 nes_quad.TcpPorts[1] = htons(cm_node->loc_port);
3641
3642 /* Produce hash key */
3643 crc_value = get_crc_value(&nes_quad);
3644 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3645 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3646 nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3647
3648 nesqp->hte_index &= nesadapter->hte_index_mask;
3649 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3650
3651 nesqp->ietf_frame = &cm_node->mpa_frame;
3652 nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3653 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3654
3655 /* notify OF layer we successfully created the requested connection */
3656 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3657 cm_event.status = 0;
3658 cm_event.provider_data = cm_id->provider_data;
3659 cm_event_laddr->sin_family = AF_INET;
3660 cm_event_laddr->sin_port = laddr->sin_port;
3661 cm_event.remote_addr = cm_id->m_remote_addr;
3662
3663 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3664 cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3665 cm_event.ird = cm_node->ird_size;
3666 cm_event.ord = cm_node->ord_size;
3667
3668 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3669 ret = cm_id->event_handler(cm_id, &cm_event);
3670 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3671
3672 if (ret)
3673 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3674 "ret=%d\n", __func__, __LINE__, ret);
3675 attr.qp_state = IB_QPS_RTS;
3676 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3677
3678 nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3679 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3680
3681 return;
3682 }
3683
3684
3685 /**
3686 * cm_event_connect_error
3687 */
3688 static void cm_event_connect_error(struct nes_cm_event *event)
3689 {
3690 struct nes_qp *nesqp;
3691 struct iw_cm_id *cm_id;
3692 struct iw_cm_event cm_event;
3693 /* struct nes_cm_info cm_info; */
3694 int ret;
3695
3696 if (!event->cm_node)
3697 return;
3698
3699 cm_id = event->cm_node->cm_id;
3700 if (!cm_id)
3701 return;
3702
3703 nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3704 nesqp = cm_id->provider_data;
3705
3706 if (!nesqp)
3707 return;
3708
3709 /* notify OF layer about this connection error event */
3710 /* cm_id->rem_ref(cm_id); */
3711 nesqp->cm_id = NULL;
3712 cm_id->provider_data = NULL;
3713 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3714 cm_event.status = -ECONNRESET;
3715 cm_event.provider_data = cm_id->provider_data;
3716 cm_event.local_addr = cm_id->m_local_addr;
3717 cm_event.remote_addr = cm_id->m_remote_addr;
3718 cm_event.private_data = NULL;
3719 cm_event.private_data_len = 0;
3720
3721 #ifdef CONFIG_INFINIBAND_NES_DEBUG
3722 {
3723 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3724 &cm_event.local_addr;
3725 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3726 &cm_event.remote_addr;
3727 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remote_addr=%08x\n",
3728 cm_event_laddr->sin_addr.s_addr, cm_event_raddr->sin_addr.s_addr);
3729 }
3730 #endif
3731
3732 ret = cm_id->event_handler(cm_id, &cm_event);
3733 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3734 if (ret)
3735 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3736 "ret=%d\n", __func__, __LINE__, ret);
3737 cm_id->rem_ref(cm_id);
3738
3739 rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3740 return;
3741 }
3742
3743
3744 /**
3745 * cm_event_reset
3746 */
3747 static void cm_event_reset(struct nes_cm_event *event)
3748 {
3749 struct nes_qp *nesqp;
3750 struct iw_cm_id *cm_id;
3751 struct iw_cm_event cm_event;
3752 /* struct nes_cm_info cm_info; */
3753 int ret;
3754
3755 if (!event->cm_node)
3756 return;
3757
3758 if (!event->cm_node->cm_id)
3759 return;
3760
3761 cm_id = event->cm_node->cm_id;
3762
3763 nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3764 nesqp = cm_id->provider_data;
3765 if (!nesqp)
3766 return;
3767
3768 nesqp->cm_id = NULL;
3769 /* cm_id->provider_data = NULL; */
3770 cm_event.event = IW_CM_EVENT_DISCONNECT;
3771 cm_event.status = -ECONNRESET;
3772 cm_event.provider_data = cm_id->provider_data;
3773 cm_event.local_addr = cm_id->m_local_addr;
3774 cm_event.remote_addr = cm_id->m_remote_addr;
3775 cm_event.private_data = NULL;
3776 cm_event.private_data_len = 0;
3777
3778 cm_id->add_ref(cm_id);
3779 ret = cm_id->event_handler(cm_id, &cm_event);
3780 atomic_inc(&cm_closes);
3781 cm_event.event = IW_CM_EVENT_CLOSE;
3782 cm_event.status = 0;
3783 cm_event.provider_data = cm_id->provider_data;
3784 cm_event.local_addr = cm_id->m_local_addr;
3785 cm_event.remote_addr = cm_id->m_remote_addr;
3786 cm_event.private_data = NULL;
3787 cm_event.private_data_len = 0;
3788 nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3789 ret = cm_id->event_handler(cm_id, &cm_event);
3790
3791 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3792
3793
3794 /* notify OF layer about this connection error event */
3795 cm_id->rem_ref(cm_id);
3796
3797 return;
3798 }
3799
3800
3801 /**
3802 * cm_event_mpa_req
3803 */
3804 static void cm_event_mpa_req(struct nes_cm_event *event)
3805 {
3806 struct iw_cm_id *cm_id;
3807 struct iw_cm_event cm_event;
3808 int ret;
3809 struct nes_cm_node *cm_node;
3810 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3811 &cm_event.local_addr;
3812 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3813 &cm_event.remote_addr;
3814
3815 cm_node = event->cm_node;
3816 if (!cm_node)
3817 return;
3818 cm_id = cm_node->cm_id;
3819
3820 atomic_inc(&cm_connect_reqs);
3821 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3822 cm_node, cm_id, jiffies);
3823
3824 cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3825 cm_event.status = 0;
3826 cm_event.provider_data = (void *)cm_node;
3827
3828 cm_event_laddr->sin_family = AF_INET;
3829 cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3830 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3831
3832 cm_event_raddr->sin_family = AF_INET;
3833 cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3834 cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3835 cm_event.private_data = cm_node->mpa_frame_buf;
3836 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3837 if (cm_node->mpa_frame_rev == IETF_MPA_V1) {
3838 cm_event.ird = NES_MAX_IRD;
3839 cm_event.ord = NES_MAX_ORD;
3840 } else {
3841 cm_event.ird = cm_node->ird_size;
3842 cm_event.ord = cm_node->ord_size;
3843 }
3844
3845 ret = cm_id->event_handler(cm_id, &cm_event);
3846 if (ret)
3847 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3848 __func__, __LINE__, ret);
3849 return;
3850 }
3851
3852
3853 static void cm_event_mpa_reject(struct nes_cm_event *event)
3854 {
3855 struct iw_cm_id *cm_id;
3856 struct iw_cm_event cm_event;
3857 struct nes_cm_node *cm_node;
3858 int ret;
3859 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3860 &cm_event.local_addr;
3861 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3862 &cm_event.remote_addr;
3863
3864 cm_node = event->cm_node;
3865 if (!cm_node)
3866 return;
3867 cm_id = cm_node->cm_id;
3868
3869 atomic_inc(&cm_connect_reqs);
3870 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3871 cm_node, cm_id, jiffies);
3872
3873 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3874 cm_event.status = -ECONNREFUSED;
3875 cm_event.provider_data = cm_id->provider_data;
3876
3877 cm_event_laddr->sin_family = AF_INET;
3878 cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3879 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3880
3881 cm_event_raddr->sin_family = AF_INET;
3882 cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3883 cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3884
3885 cm_event.private_data = cm_node->mpa_frame_buf;
3886 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3887
3888 nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3889 "remove_addr=%08x\n",
3890 cm_event_laddr->sin_addr.s_addr,
3891 cm_event_raddr->sin_addr.s_addr);
3892
3893 ret = cm_id->event_handler(cm_id, &cm_event);
3894 if (ret)
3895 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3896 __func__, __LINE__, ret);
3897
3898 return;
3899 }
3900
3901
3902 static void nes_cm_event_handler(struct work_struct *);
3903
3904 /**
3905 * nes_cm_post_event
3906 * post an event to the cm event handler
3907 */
3908 static int nes_cm_post_event(struct nes_cm_event *event)
3909 {
3910 atomic_inc(&event->cm_node->cm_core->events_posted);
3911 add_ref_cm_node(event->cm_node);
3912 event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3913 INIT_WORK(&event->event_work, nes_cm_event_handler);
3914 nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3915 event->cm_node, event);
3916
3917 queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3918
3919 nes_debug(NES_DBG_CM, "Exit\n");
3920 return 0;
3921 }
3922
3923
3924 /**
3925 * nes_cm_event_handler
3926 * worker function to handle cm events
3927 * will free instance of nes_cm_event
3928 */
3929 static void nes_cm_event_handler(struct work_struct *work)
3930 {
3931 struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3932 event_work);
3933 struct nes_cm_core *cm_core;
3934
3935 if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3936 return;
3937
3938 cm_core = event->cm_node->cm_core;
3939 nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3940 event, event->type, atomic_read(&cm_core->events_posted));
3941
3942 switch (event->type) {
3943 case NES_CM_EVENT_MPA_REQ:
3944 cm_event_mpa_req(event);
3945 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3946 event->cm_node);
3947 break;
3948 case NES_CM_EVENT_RESET:
3949 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3950 event->cm_node);
3951 cm_event_reset(event);
3952 break;
3953 case NES_CM_EVENT_CONNECTED:
3954 if ((!event->cm_node->cm_id) ||
3955 (event->cm_node->state != NES_CM_STATE_TSA))
3956 break;
3957 cm_event_connected(event);
3958 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3959 break;
3960 case NES_CM_EVENT_MPA_REJECT:
3961 if ((!event->cm_node->cm_id) ||
3962 (event->cm_node->state == NES_CM_STATE_TSA))
3963 break;
3964 cm_event_mpa_reject(event);
3965 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3966 break;
3967
3968 case NES_CM_EVENT_ABORTED:
3969 if ((!event->cm_node->cm_id) ||
3970 (event->cm_node->state == NES_CM_STATE_TSA))
3971 break;
3972 cm_event_connect_error(event);
3973 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3974 break;
3975 case NES_CM_EVENT_DROPPED_PKT:
3976 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3977 break;
3978 default:
3979 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3980 break;
3981 }
3982
3983 atomic_dec(&cm_core->events_posted);
3984 event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3985 rem_ref_cm_node(cm_core, event->cm_node);
3986 kfree(event);
3987
3988 return;
3989 }
CRIS linux kernel tree