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/secure_seq.h>
62 #include <net/tcp.h>
63 #include <linux/fcntl.h>
64
65 #include "nes.h"
66
67 u32 cm_packets_sent;
68 u32 cm_packets_bounced;
69 u32 cm_packets_dropped;
70 u32 cm_packets_retrans;
71 u32 cm_packets_created;
72 u32 cm_packets_received;
73 atomic_t cm_listens_created;
74 atomic_t cm_listens_destroyed;
75 u32 cm_backlog_drops;
76 atomic_t cm_loopbacks;
77 atomic_t cm_nodes_created;
78 atomic_t cm_nodes_destroyed;
79 atomic_t cm_accel_dropped_pkts;
80 atomic_t cm_resets_recvd;
81
82 static inline int mini_cm_accelerated(struct nes_cm_core *, struct nes_cm_node *);
83 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *, struct nes_vnic *, struct nes_cm_info *);
84 static int mini_cm_del_listen(struct nes_cm_core *, struct nes_cm_listener *);
85 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *, struct nes_vnic *, u16, void *, struct nes_cm_info *);
86 static int mini_cm_close(struct nes_cm_core *, struct nes_cm_node *);
87 static int mini_cm_accept(struct nes_cm_core *, struct nes_cm_node *);
88 static int mini_cm_reject(struct nes_cm_core *, struct nes_cm_node *);
89 static int mini_cm_recv_pkt(struct nes_cm_core *, struct nes_vnic *, struct sk_buff *);
90 static int mini_cm_dealloc_core(struct nes_cm_core *);
91 static int mini_cm_get(struct nes_cm_core *);
92 static int mini_cm_set(struct nes_cm_core *, u32, u32);
93
94 static void form_cm_frame(struct sk_buff *, struct nes_cm_node *, void *, u32, void *, u32, u8);
95 static int add_ref_cm_node(struct nes_cm_node *);
96 static int rem_ref_cm_node(struct nes_cm_core *, struct nes_cm_node *);
97
98 static int nes_cm_disconn_true(struct nes_qp *);
99 static int nes_cm_post_event(struct nes_cm_event *event);
100 static int nes_disconnect(struct nes_qp *nesqp, int abrupt);
101 static void nes_disconnect_worker(struct work_struct *work);
102
103 static int send_mpa_request(struct nes_cm_node *, struct sk_buff *);
104 static int send_mpa_reject(struct nes_cm_node *);
105 static int send_syn(struct nes_cm_node *, u32, struct sk_buff *);
106 static int send_reset(struct nes_cm_node *, struct sk_buff *);
107 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb);
108 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb);
109 static void process_packet(struct nes_cm_node *, struct sk_buff *, struct nes_cm_core *);
110
111 static void active_open_err(struct nes_cm_node *, struct sk_buff *, int);
112 static void passive_open_err(struct nes_cm_node *, struct sk_buff *, int);
113 static void cleanup_retrans_entry(struct nes_cm_node *);
114 static void handle_rcv_mpa(struct nes_cm_node *, struct sk_buff *);
115 static void free_retrans_entry(struct nes_cm_node *cm_node);
116 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph, struct sk_buff *skb, int optionsize, int passive);
117
118 /* CM event handler functions */
119 static void cm_event_connected(struct nes_cm_event *);
120 static void cm_event_connect_error(struct nes_cm_event *);
121 static void cm_event_reset(struct nes_cm_event *);
122 static void cm_event_mpa_req(struct nes_cm_event *);
123 static void cm_event_mpa_reject(struct nes_cm_event *);
124 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node);
125
126 /* MPA build functions */
127 static int cm_build_mpa_frame(struct nes_cm_node *, u8 **, u16 *, u8 *, u8);
128 static void build_mpa_v2(struct nes_cm_node *, void *, u8);
129 static void build_mpa_v1(struct nes_cm_node *, void *, u8);
130 static void build_rdma0_msg(struct nes_cm_node *, struct nes_qp **);
131
132 static void print_core(struct nes_cm_core *core);
133 static void record_ird_ord(struct nes_cm_node *, u16, u16);
134
135 /* External CM API Interface */
136 /* instance of function pointers for client API */
137 /* set address of this instance to cm_core->cm_ops at cm_core alloc */
138 static const struct nes_cm_ops nes_cm_api = {
139 .accelerated = mini_cm_accelerated,
140 .listen = mini_cm_listen,
141 .stop_listener = mini_cm_del_listen,
142 .connect = mini_cm_connect,
143 .close = mini_cm_close,
144 .accept = mini_cm_accept,
145 .reject = mini_cm_reject,
146 .recv_pkt = mini_cm_recv_pkt,
147 .destroy_cm_core = mini_cm_dealloc_core,
148 .get = mini_cm_get,
149 .set = mini_cm_set
150 };
151
152 static struct nes_cm_core *g_cm_core;
153
154 atomic_t cm_connects;
155 atomic_t cm_accepts;
156 atomic_t cm_disconnects;
157 atomic_t cm_closes;
158 atomic_t cm_connecteds;
159 atomic_t cm_connect_reqs;
160 atomic_t cm_rejects;
161
nes_add_ref_cm_node(struct nes_cm_node * cm_node)162 int nes_add_ref_cm_node(struct nes_cm_node *cm_node)
163 {
164 return add_ref_cm_node(cm_node);
165 }
166
nes_rem_ref_cm_node(struct nes_cm_node * cm_node)167 int nes_rem_ref_cm_node(struct nes_cm_node *cm_node)
168 {
169 return rem_ref_cm_node(cm_node->cm_core, cm_node);
170 }
171 /**
172 * create_event
173 */
create_event(struct nes_cm_node * cm_node,enum nes_cm_event_type type)174 static struct nes_cm_event *create_event(struct nes_cm_node * cm_node,
175 enum nes_cm_event_type type)
176 {
177 struct nes_cm_event *event;
178
179 if (!cm_node->cm_id)
180 return NULL;
181
182 /* allocate an empty event */
183 event = kzalloc(sizeof(*event), GFP_ATOMIC);
184
185 if (!event)
186 return NULL;
187
188 event->type = type;
189 event->cm_node = cm_node;
190 event->cm_info.rem_addr = cm_node->rem_addr;
191 event->cm_info.loc_addr = cm_node->loc_addr;
192 event->cm_info.rem_port = cm_node->rem_port;
193 event->cm_info.loc_port = cm_node->loc_port;
194 event->cm_info.cm_id = cm_node->cm_id;
195
196 nes_debug(NES_DBG_CM, "cm_node=%p Created event=%p, type=%u, "
197 "dst_addr=%08x[%x], src_addr=%08x[%x]\n",
198 cm_node, event, type, event->cm_info.loc_addr,
199 event->cm_info.loc_port, event->cm_info.rem_addr,
200 event->cm_info.rem_port);
201
202 nes_cm_post_event(event);
203 return event;
204 }
205
206
207 /**
208 * send_mpa_request
209 */
send_mpa_request(struct nes_cm_node * cm_node,struct sk_buff * skb)210 static int send_mpa_request(struct nes_cm_node *cm_node, struct sk_buff *skb)
211 {
212 u8 start_addr = 0;
213 u8 *start_ptr = &start_addr;
214 u8 **start_buff = &start_ptr;
215 u16 buff_len = 0;
216
217 if (!skb) {
218 nes_debug(NES_DBG_CM, "skb set to NULL\n");
219 return -1;
220 }
221
222 /* send an MPA Request frame */
223 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REQUEST);
224 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK);
225
226 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
227 }
228
229
230
send_mpa_reject(struct nes_cm_node * cm_node)231 static int send_mpa_reject(struct nes_cm_node *cm_node)
232 {
233 struct sk_buff *skb = NULL;
234 u8 start_addr = 0;
235 u8 *start_ptr = &start_addr;
236 u8 **start_buff = &start_ptr;
237 u16 buff_len = 0;
238 struct ietf_mpa_v1 *mpa_frame;
239
240 skb = dev_alloc_skb(MAX_CM_BUFFER);
241 if (!skb) {
242 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
243 return -ENOMEM;
244 }
245
246 /* send an MPA reject frame */
247 cm_build_mpa_frame(cm_node, start_buff, &buff_len, NULL, MPA_KEY_REPLY);
248 mpa_frame = (struct ietf_mpa_v1 *)*start_buff;
249 mpa_frame->flags |= IETF_MPA_FLAGS_REJECT;
250 form_cm_frame(skb, cm_node, NULL, 0, *start_buff, buff_len, SET_ACK | SET_FIN);
251
252 cm_node->state = NES_CM_STATE_FIN_WAIT1;
253 return schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
254 }
255
256
257 /**
258 * recv_mpa - process a received TCP pkt, we are expecting an
259 * IETF MPA frame
260 */
parse_mpa(struct nes_cm_node * cm_node,u8 * buffer,u32 * type,u32 len)261 static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
262 u32 len)
263 {
264 struct ietf_mpa_v1 *mpa_frame;
265 struct ietf_mpa_v2 *mpa_v2_frame;
266 struct ietf_rtr_msg *rtr_msg;
267 int mpa_hdr_len;
268 int priv_data_len;
269
270 *type = NES_MPA_REQUEST_ACCEPT;
271
272 /* assume req frame is in tcp data payload */
273 if (len < sizeof(struct ietf_mpa_v1)) {
274 nes_debug(NES_DBG_CM, "The received ietf buffer was too small (%x)\n", len);
275 return -EINVAL;
276 }
277
278 /* points to the beginning of the frame, which could be MPA V1 or V2 */
279 mpa_frame = (struct ietf_mpa_v1 *)buffer;
280 mpa_hdr_len = sizeof(struct ietf_mpa_v1);
281 priv_data_len = ntohs(mpa_frame->priv_data_len);
282
283 /* make sure mpa private data len is less than 512 bytes */
284 if (priv_data_len > IETF_MAX_PRIV_DATA_LEN) {
285 nes_debug(NES_DBG_CM, "The received Length of Private"
286 " Data field exceeds 512 octets\n");
287 return -EINVAL;
288 }
289 /*
290 * make sure MPA receiver interoperate with the
291 * received MPA version and MPA key information
292 *
293 */
294 if (mpa_frame->rev != IETF_MPA_V1 && mpa_frame->rev != IETF_MPA_V2) {
295 nes_debug(NES_DBG_CM, "The received mpa version"
296 " is not supported\n");
297 return -EINVAL;
298 }
299 /*
300 * backwards compatibility only
301 */
302 if (mpa_frame->rev > cm_node->mpa_frame_rev) {
303 nes_debug(NES_DBG_CM, "The received mpa version"
304 " can not be interoperated\n");
305 return -EINVAL;
306 } else {
307 cm_node->mpa_frame_rev = mpa_frame->rev;
308 }
309
310 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
311 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
312 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
313 return -EINVAL;
314 }
315 } else {
316 if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
317 nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
318 return -EINVAL;
319 }
320 }
321
322 if (priv_data_len + mpa_hdr_len != len) {
323 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
324 " complete (%x + %x != %x)\n",
325 priv_data_len, mpa_hdr_len, len);
326 return -EINVAL;
327 }
328 /* make sure it does not exceed the max size */
329 if (len > MAX_CM_BUFFER) {
330 nes_debug(NES_DBG_CM, "The received ietf buffer was too large"
331 " (%x + %x != %x)\n",
332 priv_data_len, mpa_hdr_len, len);
333 return -EINVAL;
334 }
335
336 cm_node->mpa_frame_size = priv_data_len;
337
338 switch (mpa_frame->rev) {
339 case IETF_MPA_V2: {
340 u16 ird_size;
341 u16 ord_size;
342 u16 rtr_ctrl_ird;
343 u16 rtr_ctrl_ord;
344
345 mpa_v2_frame = (struct ietf_mpa_v2 *)buffer;
346 mpa_hdr_len += IETF_RTR_MSG_SIZE;
347 cm_node->mpa_frame_size -= IETF_RTR_MSG_SIZE;
348 rtr_msg = &mpa_v2_frame->rtr_msg;
349
350 /* parse rtr message */
351 rtr_ctrl_ird = ntohs(rtr_msg->ctrl_ird);
352 rtr_ctrl_ord = ntohs(rtr_msg->ctrl_ord);
353 ird_size = rtr_ctrl_ird & IETF_NO_IRD_ORD;
354 ord_size = rtr_ctrl_ord & IETF_NO_IRD_ORD;
355
356 if (!(rtr_ctrl_ird & IETF_PEER_TO_PEER)) {
357 /* send reset */
358 return -EINVAL;
359 }
360 if (ird_size == IETF_NO_IRD_ORD || ord_size == IETF_NO_IRD_ORD)
361 cm_node->mpav2_ird_ord = IETF_NO_IRD_ORD;
362
363 if (cm_node->mpav2_ird_ord != IETF_NO_IRD_ORD) {
364 /* responder */
365 if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
366 /* we are still negotiating */
367 if (ord_size > NES_MAX_IRD) {
368 cm_node->ird_size = NES_MAX_IRD;
369 } else {
370 cm_node->ird_size = ord_size;
371 if (ord_size == 0 &&
372 (rtr_ctrl_ord & IETF_RDMA0_READ)) {
373 cm_node->ird_size = 1;
374 nes_debug(NES_DBG_CM,
375 "%s: Remote peer doesn't support RDMA0_READ (ord=%u)\n",
376 __func__, ord_size);
377 }
378 }
379 if (ird_size > NES_MAX_ORD)
380 cm_node->ord_size = NES_MAX_ORD;
381 else
382 cm_node->ord_size = ird_size;
383 } else { /* initiator */
384 if (ord_size > NES_MAX_IRD) {
385 nes_debug(NES_DBG_CM,
386 "%s: Unable to support the requested (ord =%u)\n",
387 __func__, ord_size);
388 return -EINVAL;
389 }
390 cm_node->ird_size = ord_size;
391
392 if (ird_size > NES_MAX_ORD) {
393 cm_node->ord_size = NES_MAX_ORD;
394 } else {
395 if (ird_size == 0 &&
396 (rtr_ctrl_ord & IETF_RDMA0_READ)) {
397 nes_debug(NES_DBG_CM,
398 "%s: Remote peer doesn't support RDMA0_READ (ird=%u)\n",
399 __func__, ird_size);
400 return -EINVAL;
401 } else {
402 cm_node->ord_size = ird_size;
403 }
404 }
405 }
406 }
407
408 if (rtr_ctrl_ord & IETF_RDMA0_READ) {
409 cm_node->send_rdma0_op = SEND_RDMA_READ_ZERO;
410
411 } else if (rtr_ctrl_ord & IETF_RDMA0_WRITE) {
412 cm_node->send_rdma0_op = SEND_RDMA_WRITE_ZERO;
413 } else { /* Not supported RDMA0 operation */
414 return -EINVAL;
415 }
416 break;
417 }
418 case IETF_MPA_V1:
419 default:
420 break;
421 }
422
423 /* copy entire MPA frame to our cm_node's frame */
424 memcpy(cm_node->mpa_frame_buf, buffer + mpa_hdr_len, cm_node->mpa_frame_size);
425
426 if (mpa_frame->flags & IETF_MPA_FLAGS_REJECT)
427 *type = NES_MPA_REQUEST_REJECT;
428 return 0;
429 }
430
431
432 /**
433 * form_cm_frame - get a free packet and build empty frame Use
434 * node info to build.
435 */
form_cm_frame(struct sk_buff * skb,struct nes_cm_node * cm_node,void * options,u32 optionsize,void * data,u32 datasize,u8 flags)436 static void form_cm_frame(struct sk_buff *skb,
437 struct nes_cm_node *cm_node, void *options, u32 optionsize,
438 void *data, u32 datasize, u8 flags)
439 {
440 struct tcphdr *tcph;
441 struct iphdr *iph;
442 struct ethhdr *ethh;
443 u8 *buf;
444 u16 packetsize = sizeof(*iph);
445
446 packetsize += sizeof(*tcph);
447 packetsize += optionsize + datasize;
448
449 skb_trim(skb, 0);
450 memset(skb->data, 0x00, ETH_HLEN + sizeof(*iph) + sizeof(*tcph));
451
452 buf = skb_put(skb, packetsize + ETH_HLEN);
453
454 ethh = (struct ethhdr *)buf;
455 buf += ETH_HLEN;
456
457 iph = (struct iphdr *)buf;
458 buf += sizeof(*iph);
459 tcph = (struct tcphdr *)buf;
460 skb_reset_mac_header(skb);
461 skb_set_network_header(skb, ETH_HLEN);
462 skb_set_transport_header(skb, ETH_HLEN + sizeof(*iph));
463 buf += sizeof(*tcph);
464
465 skb->ip_summed = CHECKSUM_PARTIAL;
466 if (!(cm_node->netdev->features & NETIF_F_IP_CSUM))
467 skb->ip_summed = CHECKSUM_NONE;
468 skb->protocol = htons(0x800);
469 skb->data_len = 0;
470 skb->mac_len = ETH_HLEN;
471
472 memcpy(ethh->h_dest, cm_node->rem_mac, ETH_ALEN);
473 memcpy(ethh->h_source, cm_node->loc_mac, ETH_ALEN);
474 ethh->h_proto = htons(0x0800);
475
476 iph->version = IPVERSION;
477 iph->ihl = 5; /* 5 * 4Byte words, IP headr len */
478 iph->tos = 0;
479 iph->tot_len = htons(packetsize);
480 iph->id = htons(++cm_node->tcp_cntxt.loc_id);
481
482 iph->frag_off = htons(0x4000);
483 iph->ttl = 0x40;
484 iph->protocol = 0x06; /* IPPROTO_TCP */
485
486 iph->saddr = htonl(cm_node->loc_addr);
487 iph->daddr = htonl(cm_node->rem_addr);
488
489 tcph->source = htons(cm_node->loc_port);
490 tcph->dest = htons(cm_node->rem_port);
491 tcph->seq = htonl(cm_node->tcp_cntxt.loc_seq_num);
492
493 if (flags & SET_ACK) {
494 cm_node->tcp_cntxt.loc_ack_num = cm_node->tcp_cntxt.rcv_nxt;
495 tcph->ack_seq = htonl(cm_node->tcp_cntxt.loc_ack_num);
496 tcph->ack = 1;
497 } else {
498 tcph->ack_seq = 0;
499 }
500
501 if (flags & SET_SYN) {
502 cm_node->tcp_cntxt.loc_seq_num++;
503 tcph->syn = 1;
504 } else {
505 cm_node->tcp_cntxt.loc_seq_num += datasize;
506 }
507
508 if (flags & SET_FIN) {
509 cm_node->tcp_cntxt.loc_seq_num++;
510 tcph->fin = 1;
511 }
512
513 if (flags & SET_RST)
514 tcph->rst = 1;
515
516 tcph->doff = (u16)((sizeof(*tcph) + optionsize + 3) >> 2);
517 tcph->window = htons(cm_node->tcp_cntxt.rcv_wnd);
518 tcph->urg_ptr = 0;
519 if (optionsize)
520 memcpy(buf, options, optionsize);
521 buf += optionsize;
522 if (datasize)
523 memcpy(buf, data, datasize);
524
525 skb_shinfo(skb)->nr_frags = 0;
526 cm_packets_created++;
527 }
528
529 /**
530 * print_core - dump a cm core
531 */
print_core(struct nes_cm_core * core)532 static void print_core(struct nes_cm_core *core)
533 {
534 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
535 nes_debug(NES_DBG_CM, "CM Core -- (core = %p )\n", core);
536 if (!core)
537 return;
538 nes_debug(NES_DBG_CM, "---------------------------------------------\n");
539
540 nes_debug(NES_DBG_CM, "State : %u \n", core->state);
541
542 nes_debug(NES_DBG_CM, "Listen Nodes : %u \n", atomic_read(&core->listen_node_cnt));
543 nes_debug(NES_DBG_CM, "Active Nodes : %u \n", atomic_read(&core->node_cnt));
544
545 nes_debug(NES_DBG_CM, "core : %p \n", core);
546
547 nes_debug(NES_DBG_CM, "-------------- end core ---------------\n");
548 }
549
record_ird_ord(struct nes_cm_node * cm_node,u16 conn_ird,u16 conn_ord)550 static void record_ird_ord(struct nes_cm_node *cm_node,
551 u16 conn_ird, u16 conn_ord)
552 {
553 if (conn_ird > NES_MAX_IRD)
554 conn_ird = NES_MAX_IRD;
555
556 if (conn_ord > NES_MAX_ORD)
557 conn_ord = NES_MAX_ORD;
558
559 cm_node->ird_size = conn_ird;
560 cm_node->ord_size = conn_ord;
561 }
562
563 /**
564 * cm_build_mpa_frame - build a MPA V1 frame or MPA V2 frame
565 */
cm_build_mpa_frame(struct nes_cm_node * cm_node,u8 ** start_buff,u16 * buff_len,u8 * pci_mem,u8 mpa_key)566 static int cm_build_mpa_frame(struct nes_cm_node *cm_node, u8 **start_buff,
567 u16 *buff_len, u8 *pci_mem, u8 mpa_key)
568 {
569 int ret = 0;
570
571 *start_buff = (pci_mem) ? pci_mem : &cm_node->mpa_frame_buf[0];
572
573 switch (cm_node->mpa_frame_rev) {
574 case IETF_MPA_V1:
575 *start_buff = (u8 *)*start_buff + sizeof(struct ietf_rtr_msg);
576 *buff_len = sizeof(struct ietf_mpa_v1) + cm_node->mpa_frame_size;
577 build_mpa_v1(cm_node, *start_buff, mpa_key);
578 break;
579 case IETF_MPA_V2:
580 *buff_len = sizeof(struct ietf_mpa_v2) + cm_node->mpa_frame_size;
581 build_mpa_v2(cm_node, *start_buff, mpa_key);
582 break;
583 default:
584 ret = -EINVAL;
585 }
586 return ret;
587 }
588
589 /**
590 * build_mpa_v2 - build a MPA V2 frame
591 */
build_mpa_v2(struct nes_cm_node * cm_node,void * start_addr,u8 mpa_key)592 static void build_mpa_v2(struct nes_cm_node *cm_node,
593 void *start_addr, u8 mpa_key)
594 {
595 struct ietf_mpa_v2 *mpa_frame = (struct ietf_mpa_v2 *)start_addr;
596 struct ietf_rtr_msg *rtr_msg = &mpa_frame->rtr_msg;
597 u16 ctrl_ird;
598 u16 ctrl_ord;
599
600 /* initialize the upper 5 bytes of the frame */
601 build_mpa_v1(cm_node, start_addr, mpa_key);
602 mpa_frame->flags |= IETF_MPA_V2_FLAG; /* set a bit to indicate MPA V2 */
603 mpa_frame->priv_data_len += htons(IETF_RTR_MSG_SIZE);
604
605 /* initialize RTR msg */
606 if (cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
607 ctrl_ird = IETF_NO_IRD_ORD;
608 ctrl_ord = IETF_NO_IRD_ORD;
609 } else {
610 ctrl_ird = cm_node->ird_size & IETF_NO_IRD_ORD;
611 ctrl_ord = cm_node->ord_size & IETF_NO_IRD_ORD;
612 }
613 ctrl_ird |= IETF_PEER_TO_PEER;
614
615 switch (mpa_key) {
616 case MPA_KEY_REQUEST:
617 ctrl_ord |= IETF_RDMA0_WRITE;
618 ctrl_ord |= IETF_RDMA0_READ;
619 break;
620 case MPA_KEY_REPLY:
621 switch (cm_node->send_rdma0_op) {
622 case SEND_RDMA_WRITE_ZERO:
623 ctrl_ord |= IETF_RDMA0_WRITE;
624 break;
625 case SEND_RDMA_READ_ZERO:
626 ctrl_ord |= IETF_RDMA0_READ;
627 break;
628 }
629 }
630 rtr_msg->ctrl_ird = htons(ctrl_ird);
631 rtr_msg->ctrl_ord = htons(ctrl_ord);
632 }
633
634 /**
635 * build_mpa_v1 - build a MPA V1 frame
636 */
build_mpa_v1(struct nes_cm_node * cm_node,void * start_addr,u8 mpa_key)637 static void build_mpa_v1(struct nes_cm_node *cm_node, void *start_addr, u8 mpa_key)
638 {
639 struct ietf_mpa_v1 *mpa_frame = (struct ietf_mpa_v1 *)start_addr;
640
641 switch (mpa_key) {
642 case MPA_KEY_REQUEST:
643 memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
644 break;
645 case MPA_KEY_REPLY:
646 memcpy(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
647 break;
648 }
649 mpa_frame->flags = IETF_MPA_FLAGS_CRC;
650 mpa_frame->rev = cm_node->mpa_frame_rev;
651 mpa_frame->priv_data_len = htons(cm_node->mpa_frame_size);
652 }
653
build_rdma0_msg(struct nes_cm_node * cm_node,struct nes_qp ** nesqp_addr)654 static void build_rdma0_msg(struct nes_cm_node *cm_node, struct nes_qp **nesqp_addr)
655 {
656 u64 u64temp;
657 struct nes_qp *nesqp = *nesqp_addr;
658 struct nes_hw_qp_wqe *wqe = &nesqp->hwqp.sq_vbase[0];
659
660 u64temp = (unsigned long)nesqp->nesuqp_addr;
661 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
662 set_wqe_64bit_value(wqe->wqe_words, NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX, u64temp);
663
664 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] = 0;
665 wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] = 0;
666
667 switch (cm_node->send_rdma0_op) {
668 case SEND_RDMA_WRITE_ZERO:
669 nes_debug(NES_DBG_CM, "Sending first write.\n");
670 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
671 cpu_to_le32(NES_IWARP_SQ_OP_RDMAW);
672 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] = 0;
673 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] = 0;
674 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
675 break;
676
677 case SEND_RDMA_READ_ZERO:
678 default:
679 if (cm_node->send_rdma0_op != SEND_RDMA_READ_ZERO)
680 WARN(1, "Unsupported RDMA0 len operation=%u\n",
681 cm_node->send_rdma0_op);
682 nes_debug(NES_DBG_CM, "Sending first rdma operation.\n");
683 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
684 cpu_to_le32(NES_IWARP_SQ_OP_RDMAR);
685 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_LOW_IDX] = 1;
686 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_TO_HIGH_IDX] = 0;
687 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_LENGTH_IDX] = 0;
688 wqe->wqe_words[NES_IWARP_SQ_WQE_RDMA_STAG_IDX] = 1;
689 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 1;
690 break;
691 }
692
693 if (nesqp->sq_kmapped) {
694 nesqp->sq_kmapped = 0;
695 kunmap(nesqp->page);
696 }
697
698 /*use the reserved spot on the WQ for the extra first WQE*/
699 nesqp->nesqp_context->ird_ord_sizes &= cpu_to_le32(~(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
700 NES_QPCONTEXT_ORDIRD_WRPDU |
701 NES_QPCONTEXT_ORDIRD_ALSMM));
702 nesqp->skip_lsmm = 1;
703 nesqp->hwqp.sq_tail = 0;
704 }
705
706 /**
707 * schedule_nes_timer
708 * note - cm_node needs to be protected before calling this. Encase in:
709 * rem_ref_cm_node(cm_core, cm_node);add_ref_cm_node(cm_node);
710 */
schedule_nes_timer(struct nes_cm_node * cm_node,struct sk_buff * skb,enum nes_timer_type type,int send_retrans,int close_when_complete)711 int schedule_nes_timer(struct nes_cm_node *cm_node, struct sk_buff *skb,
712 enum nes_timer_type type, int send_retrans,
713 int close_when_complete)
714 {
715 unsigned long flags;
716 struct nes_cm_core *cm_core = cm_node->cm_core;
717 struct nes_timer_entry *new_send;
718 int ret = 0;
719
720 new_send = kzalloc(sizeof(*new_send), GFP_ATOMIC);
721 if (!new_send)
722 return -ENOMEM;
723
724 /* new_send->timetosend = currenttime */
725 new_send->retrycount = NES_DEFAULT_RETRYS;
726 new_send->retranscount = NES_DEFAULT_RETRANS;
727 new_send->skb = skb;
728 new_send->timetosend = jiffies;
729 new_send->type = type;
730 new_send->netdev = cm_node->netdev;
731 new_send->send_retrans = send_retrans;
732 new_send->close_when_complete = close_when_complete;
733
734 if (type == NES_TIMER_TYPE_CLOSE) {
735 new_send->timetosend += (HZ / 10);
736 if (cm_node->recv_entry) {
737 kfree(new_send);
738 WARN_ON(1);
739 return -EINVAL;
740 }
741 cm_node->recv_entry = new_send;
742 }
743
744 if (type == NES_TIMER_TYPE_SEND) {
745 new_send->seq_num = ntohl(tcp_hdr(skb)->seq);
746 refcount_inc(&new_send->skb->users);
747 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
748 cm_node->send_entry = new_send;
749 add_ref_cm_node(cm_node);
750 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
751 new_send->timetosend = jiffies + NES_RETRY_TIMEOUT;
752
753 ret = nes_nic_cm_xmit(new_send->skb, cm_node->netdev);
754 if (ret != NETDEV_TX_OK) {
755 nes_debug(NES_DBG_CM, "Error sending packet %p "
756 "(jiffies = %lu)\n", new_send, jiffies);
757 new_send->timetosend = jiffies;
758 ret = NETDEV_TX_OK;
759 } else {
760 cm_packets_sent++;
761 if (!send_retrans) {
762 cleanup_retrans_entry(cm_node);
763 if (close_when_complete)
764 rem_ref_cm_node(cm_core, cm_node);
765 return ret;
766 }
767 }
768 }
769
770 if (!timer_pending(&cm_core->tcp_timer))
771 mod_timer(&cm_core->tcp_timer, new_send->timetosend);
772
773 return ret;
774 }
775
nes_retrans_expired(struct nes_cm_node * cm_node)776 static void nes_retrans_expired(struct nes_cm_node *cm_node)
777 {
778 struct iw_cm_id *cm_id = cm_node->cm_id;
779 enum nes_cm_node_state state = cm_node->state;
780 cm_node->state = NES_CM_STATE_CLOSED;
781
782 switch (state) {
783 case NES_CM_STATE_SYN_RCVD:
784 case NES_CM_STATE_CLOSING:
785 rem_ref_cm_node(cm_node->cm_core, cm_node);
786 break;
787 case NES_CM_STATE_LAST_ACK:
788 case NES_CM_STATE_FIN_WAIT1:
789 if (cm_node->cm_id)
790 cm_id->rem_ref(cm_id);
791 send_reset(cm_node, NULL);
792 break;
793 default:
794 add_ref_cm_node(cm_node);
795 send_reset(cm_node, NULL);
796 create_event(cm_node, NES_CM_EVENT_ABORTED);
797 }
798 }
799
handle_recv_entry(struct nes_cm_node * cm_node,u32 rem_node)800 static void handle_recv_entry(struct nes_cm_node *cm_node, u32 rem_node)
801 {
802 struct nes_timer_entry *recv_entry = cm_node->recv_entry;
803 struct iw_cm_id *cm_id = cm_node->cm_id;
804 struct nes_qp *nesqp;
805 unsigned long qplockflags;
806
807 if (!recv_entry)
808 return;
809 nesqp = (struct nes_qp *)recv_entry->skb;
810 if (nesqp) {
811 spin_lock_irqsave(&nesqp->lock, qplockflags);
812 if (nesqp->cm_id) {
813 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
814 "refcount = %d: HIT A "
815 "NES_TIMER_TYPE_CLOSE with something "
816 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
817 atomic_read(&nesqp->refcount));
818 nesqp->hw_tcp_state = NES_AEQE_TCP_STATE_CLOSED;
819 nesqp->last_aeq = NES_AEQE_AEID_RESET_SENT;
820 nesqp->ibqp_state = IB_QPS_ERR;
821 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
822 nes_cm_disconn(nesqp);
823 } else {
824 spin_unlock_irqrestore(&nesqp->lock, qplockflags);
825 nes_debug(NES_DBG_CM, "QP%u: cm_id = %p, "
826 "refcount = %d: HIT A "
827 "NES_TIMER_TYPE_CLOSE with nothing "
828 "to do!!!\n", nesqp->hwqp.qp_id, cm_id,
829 atomic_read(&nesqp->refcount));
830 }
831 } else if (rem_node) {
832 /* TIME_WAIT state */
833 rem_ref_cm_node(cm_node->cm_core, cm_node);
834 }
835 if (cm_node->cm_id)
836 cm_id->rem_ref(cm_id);
837 kfree(recv_entry);
838 cm_node->recv_entry = NULL;
839 }
840
841 /**
842 * nes_cm_timer_tick
843 */
nes_cm_timer_tick(struct timer_list * unused)844 static void nes_cm_timer_tick(struct timer_list *unused)
845 {
846 unsigned long flags;
847 unsigned long nexttimeout = jiffies + NES_LONG_TIME;
848 struct nes_cm_node *cm_node;
849 struct nes_timer_entry *send_entry, *recv_entry;
850 struct list_head *list_core_temp;
851 struct list_head *list_node;
852 struct nes_cm_core *cm_core = g_cm_core;
853 u32 settimer = 0;
854 unsigned long timetosend;
855 int ret = NETDEV_TX_OK;
856
857 struct list_head timer_list;
858
859 INIT_LIST_HEAD(&timer_list);
860 spin_lock_irqsave(&cm_core->ht_lock, flags);
861
862 list_for_each_safe(list_node, list_core_temp,
863 &cm_core->connected_nodes) {
864 cm_node = container_of(list_node, struct nes_cm_node, list);
865 if ((cm_node->recv_entry) || (cm_node->send_entry)) {
866 add_ref_cm_node(cm_node);
867 list_add(&cm_node->timer_entry, &timer_list);
868 }
869 }
870 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
871
872 list_for_each_safe(list_node, list_core_temp, &timer_list) {
873 cm_node = container_of(list_node, struct nes_cm_node,
874 timer_entry);
875 recv_entry = cm_node->recv_entry;
876
877 if (recv_entry) {
878 if (time_after(recv_entry->timetosend, jiffies)) {
879 if (nexttimeout > recv_entry->timetosend ||
880 !settimer) {
881 nexttimeout = recv_entry->timetosend;
882 settimer = 1;
883 }
884 } else {
885 handle_recv_entry(cm_node, 1);
886 }
887 }
888
889 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
890 do {
891 send_entry = cm_node->send_entry;
892 if (!send_entry)
893 break;
894 if (time_after(send_entry->timetosend, jiffies)) {
895 if (cm_node->state != NES_CM_STATE_TSA) {
896 if ((nexttimeout >
897 send_entry->timetosend) ||
898 !settimer) {
899 nexttimeout =
900 send_entry->timetosend;
901 settimer = 1;
902 }
903 } else {
904 free_retrans_entry(cm_node);
905 }
906 break;
907 }
908
909 if ((cm_node->state == NES_CM_STATE_TSA) ||
910 (cm_node->state == NES_CM_STATE_CLOSED)) {
911 free_retrans_entry(cm_node);
912 break;
913 }
914
915 if (!send_entry->retranscount ||
916 !send_entry->retrycount) {
917 cm_packets_dropped++;
918 free_retrans_entry(cm_node);
919
920 spin_unlock_irqrestore(
921 &cm_node->retrans_list_lock, flags);
922 nes_retrans_expired(cm_node);
923 cm_node->state = NES_CM_STATE_CLOSED;
924 spin_lock_irqsave(&cm_node->retrans_list_lock,
925 flags);
926 break;
927 }
928 refcount_inc(&send_entry->skb->users);
929 cm_packets_retrans++;
930 nes_debug(NES_DBG_CM, "Retransmitting send_entry %p "
931 "for node %p, jiffies = %lu, time to send = "
932 "%lu, retranscount = %u, send_entry->seq_num = "
933 "0x%08X, cm_node->tcp_cntxt.rem_ack_num = "
934 "0x%08X\n", send_entry, cm_node, jiffies,
935 send_entry->timetosend,
936 send_entry->retranscount,
937 send_entry->seq_num,
938 cm_node->tcp_cntxt.rem_ack_num);
939
940 spin_unlock_irqrestore(&cm_node->retrans_list_lock,
941 flags);
942 ret = nes_nic_cm_xmit(send_entry->skb, cm_node->netdev);
943 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
944 if (ret != NETDEV_TX_OK) {
945 nes_debug(NES_DBG_CM, "rexmit failed for "
946 "node=%p\n", cm_node);
947 cm_packets_bounced++;
948 send_entry->retrycount--;
949 nexttimeout = jiffies + NES_SHORT_TIME;
950 settimer = 1;
951 break;
952 } else {
953 cm_packets_sent++;
954 }
955 nes_debug(NES_DBG_CM, "Packet Sent: retrans count = "
956 "%u, retry count = %u.\n",
957 send_entry->retranscount,
958 send_entry->retrycount);
959 if (send_entry->send_retrans) {
960 send_entry->retranscount--;
961 timetosend = (NES_RETRY_TIMEOUT <<
962 (NES_DEFAULT_RETRANS - send_entry->retranscount));
963
964 send_entry->timetosend = jiffies +
965 min(timetosend, NES_MAX_TIMEOUT);
966 if (nexttimeout > send_entry->timetosend ||
967 !settimer) {
968 nexttimeout = send_entry->timetosend;
969 settimer = 1;
970 }
971 } else {
972 int close_when_complete;
973 close_when_complete =
974 send_entry->close_when_complete;
975 nes_debug(NES_DBG_CM, "cm_node=%p state=%d\n",
976 cm_node, cm_node->state);
977 free_retrans_entry(cm_node);
978 if (close_when_complete)
979 rem_ref_cm_node(cm_node->cm_core,
980 cm_node);
981 }
982 } while (0);
983
984 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
985 rem_ref_cm_node(cm_node->cm_core, cm_node);
986 }
987
988 if (settimer) {
989 if (!timer_pending(&cm_core->tcp_timer))
990 mod_timer(&cm_core->tcp_timer, nexttimeout);
991 }
992 }
993
994
995 /**
996 * send_syn
997 */
send_syn(struct nes_cm_node * cm_node,u32 sendack,struct sk_buff * skb)998 static int send_syn(struct nes_cm_node *cm_node, u32 sendack,
999 struct sk_buff *skb)
1000 {
1001 int ret;
1002 int flags = SET_SYN;
1003 char optionsbuffer[sizeof(struct option_mss) +
1004 sizeof(struct option_windowscale) + sizeof(struct option_base) +
1005 TCP_OPTIONS_PADDING];
1006
1007 int optionssize = 0;
1008 /* Sending MSS option */
1009 union all_known_options *options;
1010
1011 if (!cm_node)
1012 return -EINVAL;
1013
1014 options = (union all_known_options *)&optionsbuffer[optionssize];
1015 options->as_mss.optionnum = OPTION_NUMBER_MSS;
1016 options->as_mss.length = sizeof(struct option_mss);
1017 options->as_mss.mss = htons(cm_node->tcp_cntxt.mss);
1018 optionssize += sizeof(struct option_mss);
1019
1020 options = (union all_known_options *)&optionsbuffer[optionssize];
1021 options->as_windowscale.optionnum = OPTION_NUMBER_WINDOW_SCALE;
1022 options->as_windowscale.length = sizeof(struct option_windowscale);
1023 options->as_windowscale.shiftcount = cm_node->tcp_cntxt.rcv_wscale;
1024 optionssize += sizeof(struct option_windowscale);
1025
1026 if (sendack && !(NES_DRV_OPT_SUPRESS_OPTION_BC & nes_drv_opt)) {
1027 options = (union all_known_options *)&optionsbuffer[optionssize];
1028 options->as_base.optionnum = OPTION_NUMBER_WRITE0;
1029 options->as_base.length = sizeof(struct option_base);
1030 optionssize += sizeof(struct option_base);
1031 /* we need the size to be a multiple of 4 */
1032 options = (union all_known_options *)&optionsbuffer[optionssize];
1033 options->as_end = 1;
1034 optionssize += 1;
1035 options = (union all_known_options *)&optionsbuffer[optionssize];
1036 options->as_end = 1;
1037 optionssize += 1;
1038 }
1039
1040 options = (union all_known_options *)&optionsbuffer[optionssize];
1041 options->as_end = OPTION_NUMBER_END;
1042 optionssize += 1;
1043
1044 if (!skb)
1045 skb = dev_alloc_skb(MAX_CM_BUFFER);
1046 if (!skb) {
1047 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1048 return -1;
1049 }
1050
1051 if (sendack)
1052 flags |= SET_ACK;
1053
1054 form_cm_frame(skb, cm_node, optionsbuffer, optionssize, NULL, 0, flags);
1055 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1056
1057 return ret;
1058 }
1059
1060
1061 /**
1062 * send_reset
1063 */
send_reset(struct nes_cm_node * cm_node,struct sk_buff * skb)1064 static int send_reset(struct nes_cm_node *cm_node, struct sk_buff *skb)
1065 {
1066 int ret;
1067 int flags = SET_RST | SET_ACK;
1068
1069 if (!skb)
1070 skb = dev_alloc_skb(MAX_CM_BUFFER);
1071 if (!skb) {
1072 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1073 return -ENOMEM;
1074 }
1075
1076 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, flags);
1077 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 1);
1078
1079 return ret;
1080 }
1081
1082
1083 /**
1084 * send_ack
1085 */
send_ack(struct nes_cm_node * cm_node,struct sk_buff * skb)1086 static int send_ack(struct nes_cm_node *cm_node, struct sk_buff *skb)
1087 {
1088 int ret;
1089
1090 if (!skb)
1091 skb = dev_alloc_skb(MAX_CM_BUFFER);
1092
1093 if (!skb) {
1094 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1095 return -1;
1096 }
1097
1098 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK);
1099 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 0, 0);
1100
1101 return ret;
1102 }
1103
1104
1105 /**
1106 * send_fin
1107 */
send_fin(struct nes_cm_node * cm_node,struct sk_buff * skb)1108 static int send_fin(struct nes_cm_node *cm_node, struct sk_buff *skb)
1109 {
1110 int ret;
1111
1112 /* if we didn't get a frame get one */
1113 if (!skb)
1114 skb = dev_alloc_skb(MAX_CM_BUFFER);
1115
1116 if (!skb) {
1117 nes_debug(NES_DBG_CM, "Failed to get a Free pkt\n");
1118 return -1;
1119 }
1120
1121 form_cm_frame(skb, cm_node, NULL, 0, NULL, 0, SET_ACK | SET_FIN);
1122 ret = schedule_nes_timer(cm_node, skb, NES_TIMER_TYPE_SEND, 1, 0);
1123
1124 return ret;
1125 }
1126
1127
1128 /**
1129 * find_node - find a cm node that matches the reference cm node
1130 */
find_node(struct nes_cm_core * cm_core,u16 rem_port,nes_addr_t rem_addr,u16 loc_port,nes_addr_t loc_addr)1131 static struct nes_cm_node *find_node(struct nes_cm_core *cm_core,
1132 u16 rem_port, nes_addr_t rem_addr, u16 loc_port, nes_addr_t loc_addr)
1133 {
1134 unsigned long flags;
1135 struct list_head *hte;
1136 struct nes_cm_node *cm_node;
1137
1138 /* get a handle on the hte */
1139 hte = &cm_core->connected_nodes;
1140
1141 /* walk list and find cm_node associated with this session ID */
1142 spin_lock_irqsave(&cm_core->ht_lock, flags);
1143 list_for_each_entry(cm_node, hte, list) {
1144 /* compare quad, return node handle if a match */
1145 nes_debug(NES_DBG_CM, "finding node %x:%x =? %x:%x ^ %x:%x =? %x:%x\n",
1146 cm_node->loc_addr, cm_node->loc_port,
1147 loc_addr, loc_port,
1148 cm_node->rem_addr, cm_node->rem_port,
1149 rem_addr, rem_port);
1150 if ((cm_node->loc_addr == loc_addr) &&
1151 (cm_node->loc_port == loc_port) &&
1152 (cm_node->rem_addr == rem_addr) &&
1153 (cm_node->rem_port == rem_port)) {
1154 add_ref_cm_node(cm_node);
1155 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1156 return cm_node;
1157 }
1158 }
1159 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1160
1161 /* no owner node */
1162 return NULL;
1163 }
1164
1165
1166 /**
1167 * find_listener - find a cm node listening on this addr-port pair
1168 */
find_listener(struct nes_cm_core * cm_core,nes_addr_t dst_addr,u16 dst_port,enum nes_cm_listener_state listener_state)1169 static struct nes_cm_listener *find_listener(struct nes_cm_core *cm_core,
1170 nes_addr_t dst_addr, u16 dst_port,
1171 enum nes_cm_listener_state listener_state)
1172 {
1173 unsigned long flags;
1174 struct nes_cm_listener *listen_node;
1175 nes_addr_t listen_addr;
1176 u16 listen_port;
1177
1178 /* walk list and find cm_node associated with this session ID */
1179 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1180 list_for_each_entry(listen_node, &cm_core->listen_list.list, list) {
1181 listen_addr = listen_node->loc_addr;
1182 listen_port = listen_node->loc_port;
1183
1184 /* compare node pair, return node handle if a match */
1185 if (((listen_addr == dst_addr) ||
1186 listen_addr == 0x00000000) &&
1187 (listen_port == dst_port) &&
1188 (listener_state & listen_node->listener_state)) {
1189 atomic_inc(&listen_node->ref_count);
1190 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1191 return listen_node;
1192 }
1193 }
1194 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1195
1196 /* no listener */
1197 return NULL;
1198 }
1199
1200 /**
1201 * add_hte_node - add a cm node to the hash table
1202 */
add_hte_node(struct nes_cm_core * cm_core,struct nes_cm_node * cm_node)1203 static int add_hte_node(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
1204 {
1205 unsigned long flags;
1206 struct list_head *hte;
1207
1208 if (!cm_node || !cm_core)
1209 return -EINVAL;
1210
1211 nes_debug(NES_DBG_CM, "Adding Node %p to Active Connection HT\n",
1212 cm_node);
1213
1214 spin_lock_irqsave(&cm_core->ht_lock, flags);
1215
1216 /* get a handle on the hash table element (list head for this slot) */
1217 hte = &cm_core->connected_nodes;
1218 list_add_tail(&cm_node->list, hte);
1219 atomic_inc(&cm_core->ht_node_cnt);
1220
1221 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1222
1223 return 0;
1224 }
1225
1226
1227 /**
1228 * mini_cm_dec_refcnt_listen
1229 */
mini_cm_dec_refcnt_listen(struct nes_cm_core * cm_core,struct nes_cm_listener * listener,int free_hanging_nodes)1230 static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
1231 struct nes_cm_listener *listener, int free_hanging_nodes)
1232 {
1233 int ret = -EINVAL;
1234 int err = 0;
1235 unsigned long flags;
1236 struct list_head *list_pos = NULL;
1237 struct list_head *list_temp = NULL;
1238 struct nes_cm_node *cm_node = NULL;
1239 struct list_head reset_list;
1240
1241 nes_debug(NES_DBG_CM, "attempting listener= %p free_nodes= %d, "
1242 "refcnt=%d\n", listener, free_hanging_nodes,
1243 atomic_read(&listener->ref_count));
1244 /* free non-accelerated child nodes for this listener */
1245 INIT_LIST_HEAD(&reset_list);
1246 if (free_hanging_nodes) {
1247 spin_lock_irqsave(&cm_core->ht_lock, flags);
1248 list_for_each_safe(list_pos, list_temp,
1249 &g_cm_core->connected_nodes) {
1250 cm_node = container_of(list_pos, struct nes_cm_node,
1251 list);
1252 if ((cm_node->listener == listener) &&
1253 (!cm_node->accelerated)) {
1254 add_ref_cm_node(cm_node);
1255 list_add(&cm_node->reset_entry, &reset_list);
1256 }
1257 }
1258 spin_unlock_irqrestore(&cm_core->ht_lock, flags);
1259 }
1260
1261 list_for_each_safe(list_pos, list_temp, &reset_list) {
1262 cm_node = container_of(list_pos, struct nes_cm_node,
1263 reset_entry);
1264 {
1265 struct nes_cm_node *loopback = cm_node->loopbackpartner;
1266 enum nes_cm_node_state old_state;
1267 if (NES_CM_STATE_FIN_WAIT1 <= cm_node->state) {
1268 rem_ref_cm_node(cm_node->cm_core, cm_node);
1269 } else {
1270 if (!loopback) {
1271 cleanup_retrans_entry(cm_node);
1272 err = send_reset(cm_node, NULL);
1273 if (err) {
1274 cm_node->state =
1275 NES_CM_STATE_CLOSED;
1276 WARN_ON(1);
1277 } else {
1278 old_state = cm_node->state;
1279 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1280 if (old_state != NES_CM_STATE_MPAREQ_RCVD)
1281 rem_ref_cm_node(
1282 cm_node->cm_core,
1283 cm_node);
1284 }
1285 } else {
1286 struct nes_cm_event event;
1287
1288 event.cm_node = loopback;
1289 event.cm_info.rem_addr =
1290 loopback->rem_addr;
1291 event.cm_info.loc_addr =
1292 loopback->loc_addr;
1293 event.cm_info.rem_port =
1294 loopback->rem_port;
1295 event.cm_info.loc_port =
1296 loopback->loc_port;
1297 event.cm_info.cm_id = loopback->cm_id;
1298 add_ref_cm_node(loopback);
1299 loopback->state = NES_CM_STATE_CLOSED;
1300 cm_event_connect_error(&event);
1301 cm_node->state = NES_CM_STATE_LISTENER_DESTROYED;
1302
1303 rem_ref_cm_node(cm_node->cm_core,
1304 cm_node);
1305
1306 }
1307 }
1308 }
1309 }
1310
1311 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
1312 if (!atomic_dec_return(&listener->ref_count)) {
1313 list_del(&listener->list);
1314
1315 /* decrement our listen node count */
1316 atomic_dec(&cm_core->listen_node_cnt);
1317
1318 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1319
1320 if (listener->nesvnic) {
1321 nes_manage_apbvt(listener->nesvnic,
1322 listener->loc_port,
1323 PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn),
1324 NES_MANAGE_APBVT_DEL);
1325
1326 nes_debug(NES_DBG_NLMSG,
1327 "Delete APBVT loc_port = %04X\n",
1328 listener->loc_port);
1329 }
1330
1331 nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);
1332
1333 kfree(listener);
1334 listener = NULL;
1335 ret = 0;
1336 atomic_inc(&cm_listens_destroyed);
1337 } else {
1338 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
1339 }
1340 if (listener) {
1341 if (atomic_read(&listener->pend_accepts_cnt) > 0)
1342 nes_debug(NES_DBG_CM, "destroying listener (%p)"
1343 " with non-zero pending accepts=%u\n",
1344 listener, atomic_read(&listener->pend_accepts_cnt));
1345 }
1346
1347 return ret;
1348 }
1349
1350
1351 /**
1352 * mini_cm_del_listen
1353 */
mini_cm_del_listen(struct nes_cm_core * cm_core,struct nes_cm_listener * listener)1354 static int mini_cm_del_listen(struct nes_cm_core *cm_core,
1355 struct nes_cm_listener *listener)
1356 {
1357 listener->listener_state = NES_CM_LISTENER_PASSIVE_STATE;
1358 listener->cm_id = NULL; /* going to be destroyed pretty soon */
1359 return mini_cm_dec_refcnt_listen(cm_core, listener, 1);
1360 }
1361
1362
1363 /**
1364 * mini_cm_accelerated
1365 */
mini_cm_accelerated(struct nes_cm_core * cm_core,struct nes_cm_node * cm_node)1366 static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
1367 struct nes_cm_node *cm_node)
1368 {
1369 cm_node->accelerated = true;
1370
1371 if (cm_node->accept_pend) {
1372 BUG_ON(!cm_node->listener);
1373 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1374 cm_node->accept_pend = 0;
1375 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1376 }
1377
1378 if (!timer_pending(&cm_core->tcp_timer))
1379 mod_timer(&cm_core->tcp_timer, (jiffies + NES_SHORT_TIME));
1380
1381 return 0;
1382 }
1383
1384
1385 /**
1386 * nes_addr_resolve_neigh
1387 */
nes_addr_resolve_neigh(struct nes_vnic * nesvnic,u32 dst_ip,int arpindex)1388 static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
1389 {
1390 struct rtable *rt;
1391 struct neighbour *neigh;
1392 int rc = arpindex;
1393 struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
1394 __be32 dst_ipaddr = htonl(dst_ip);
1395
1396 rt = ip_route_output(&init_net, dst_ipaddr, nesvnic->local_ipaddr, 0, 0);
1397 if (IS_ERR(rt)) {
1398 printk(KERN_ERR "%s: ip_route_output_key failed for 0x%08X\n",
1399 __func__, dst_ip);
1400 return rc;
1401 }
1402
1403 neigh = dst_neigh_lookup(&rt->dst, &dst_ipaddr);
1404
1405 rcu_read_lock();
1406 if (neigh) {
1407 if (neigh->nud_state & NUD_VALID) {
1408 nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
1409 " is %pM, Gateway is 0x%08X \n", dst_ip,
1410 neigh->ha, ntohl(rt->rt_gateway));
1411
1412 if (arpindex >= 0) {
1413 if (ether_addr_equal(nesadapter->arp_table[arpindex].mac_addr, neigh->ha)) {
1414 /* Mac address same as in nes_arp_table */
1415 goto out;
1416 }
1417
1418 nes_manage_arp_cache(nesvnic->netdev,
1419 nesadapter->arp_table[arpindex].mac_addr,
1420 dst_ip, NES_ARP_DELETE);
1421 }
1422
1423 nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
1424 dst_ip, NES_ARP_ADD);
1425 rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
1426 NES_ARP_RESOLVE);
1427 } else {
1428 neigh_event_send(neigh, NULL);
1429 }
1430 }
1431 out:
1432 rcu_read_unlock();
1433
1434 if (neigh)
1435 neigh_release(neigh);
1436
1437 ip_rt_put(rt);
1438 return rc;
1439 }
1440
1441 /**
1442 * make_cm_node - create a new instance of a cm node
1443 */
make_cm_node(struct nes_cm_core * cm_core,struct nes_vnic * nesvnic,struct nes_cm_info * cm_info,struct nes_cm_listener * listener)1444 static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
1445 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info,
1446 struct nes_cm_listener *listener)
1447 {
1448 struct nes_cm_node *cm_node;
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 cm_node->tcp_cntxt.loc_seq_num = secure_tcp_seq(htonl(cm_node->loc_addr),
1500 htonl(cm_node->rem_addr),
1501 htons(cm_node->loc_port),
1502 htons(cm_node->rem_port));
1503 cm_node->tcp_cntxt.mss = nesvnic->max_frame_size - sizeof(struct iphdr) -
1504 sizeof(struct tcphdr) - ETH_HLEN - VLAN_HLEN;
1505 cm_node->tcp_cntxt.rcv_nxt = 0;
1506 /* get a unique session ID , add thread_id to an upcounter to handle race */
1507 atomic_inc(&cm_core->node_cnt);
1508 cm_node->conn_type = cm_info->conn_type;
1509 cm_node->apbvt_set = 0;
1510 cm_node->accept_pend = 0;
1511
1512 cm_node->nesvnic = nesvnic;
1513 /* get some device handles, for arp lookup */
1514 nesdev = nesvnic->nesdev;
1515 nesadapter = nesdev->nesadapter;
1516
1517 cm_node->loopbackpartner = NULL;
1518
1519 /* get the mac addr for the remote node */
1520 oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr,
1521 NULL, NES_ARP_RESOLVE);
1522 arpindex = nes_addr_resolve_neigh(nesvnic, cm_node->rem_addr,
1523 oldarpindex);
1524 if (arpindex < 0) {
1525 kfree(cm_node);
1526 return NULL;
1527 }
1528
1529 /* copy the mac addr to node context */
1530 memcpy(cm_node->rem_mac, nesadapter->arp_table[arpindex].mac_addr, ETH_ALEN);
1531 nes_debug(NES_DBG_CM, "Remote mac addr from arp table: %pM\n",
1532 cm_node->rem_mac);
1533
1534 add_hte_node(cm_core, cm_node);
1535 atomic_inc(&cm_nodes_created);
1536
1537 return cm_node;
1538 }
1539
1540
1541 /**
1542 * add_ref_cm_node - destroy an instance of a cm node
1543 */
add_ref_cm_node(struct nes_cm_node * cm_node)1544 static int add_ref_cm_node(struct nes_cm_node *cm_node)
1545 {
1546 atomic_inc(&cm_node->ref_count);
1547 return 0;
1548 }
1549
1550
1551 /**
1552 * rem_ref_cm_node - destroy an instance of a cm node
1553 */
rem_ref_cm_node(struct nes_cm_core * cm_core,struct nes_cm_node * cm_node)1554 static int rem_ref_cm_node(struct nes_cm_core *cm_core,
1555 struct nes_cm_node *cm_node)
1556 {
1557 unsigned long flags;
1558 struct nes_qp *nesqp;
1559
1560 if (!cm_node)
1561 return -EINVAL;
1562
1563 spin_lock_irqsave(&cm_node->cm_core->ht_lock, flags);
1564 if (atomic_dec_return(&cm_node->ref_count)) {
1565 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1566 return 0;
1567 }
1568 list_del(&cm_node->list);
1569 atomic_dec(&cm_core->ht_node_cnt);
1570 spin_unlock_irqrestore(&cm_node->cm_core->ht_lock, flags);
1571
1572 /* if the node is destroyed before connection was accelerated */
1573 if (!cm_node->accelerated && cm_node->accept_pend) {
1574 BUG_ON(!cm_node->listener);
1575 atomic_dec(&cm_node->listener->pend_accepts_cnt);
1576 BUG_ON(atomic_read(&cm_node->listener->pend_accepts_cnt) < 0);
1577 }
1578 WARN_ON(cm_node->send_entry);
1579 if (cm_node->recv_entry)
1580 handle_recv_entry(cm_node, 0);
1581 if (cm_node->listener) {
1582 mini_cm_dec_refcnt_listen(cm_core, cm_node->listener, 0);
1583 } else {
1584 if (cm_node->apbvt_set && cm_node->nesvnic) {
1585 nes_manage_apbvt(cm_node->nesvnic, cm_node->loc_port,
1586 PCI_FUNC(cm_node->nesvnic->nesdev->pcidev->devfn),
1587 NES_MANAGE_APBVT_DEL);
1588 }
1589 nes_debug(NES_DBG_NLMSG, "Delete APBVT loc_port = %04X\n",
1590 cm_node->loc_port);
1591 }
1592
1593 atomic_dec(&cm_core->node_cnt);
1594 atomic_inc(&cm_nodes_destroyed);
1595 nesqp = cm_node->nesqp;
1596 if (nesqp) {
1597 nesqp->cm_node = NULL;
1598 nes_rem_ref(&nesqp->ibqp);
1599 cm_node->nesqp = NULL;
1600 }
1601
1602 kfree(cm_node);
1603 return 0;
1604 }
1605
1606 /**
1607 * process_options
1608 */
process_options(struct nes_cm_node * cm_node,u8 * optionsloc,u32 optionsize,u32 syn_packet)1609 static int process_options(struct nes_cm_node *cm_node, u8 *optionsloc,
1610 u32 optionsize, u32 syn_packet)
1611 {
1612 u32 tmp;
1613 u32 offset = 0;
1614 union all_known_options *all_options;
1615 char got_mss_option = 0;
1616
1617 while (offset < optionsize) {
1618 all_options = (union all_known_options *)(optionsloc + offset);
1619 switch (all_options->as_base.optionnum) {
1620 case OPTION_NUMBER_END:
1621 offset = optionsize;
1622 break;
1623 case OPTION_NUMBER_NONE:
1624 offset += 1;
1625 continue;
1626 case OPTION_NUMBER_MSS:
1627 nes_debug(NES_DBG_CM, "%s: MSS Length: %d Offset: %d "
1628 "Size: %d\n", __func__,
1629 all_options->as_mss.length, offset, optionsize);
1630 got_mss_option = 1;
1631 if (all_options->as_mss.length != 4) {
1632 return 1;
1633 } else {
1634 tmp = ntohs(all_options->as_mss.mss);
1635 if (tmp > 0 && tmp <
1636 cm_node->tcp_cntxt.mss)
1637 cm_node->tcp_cntxt.mss = tmp;
1638 }
1639 break;
1640 case OPTION_NUMBER_WINDOW_SCALE:
1641 cm_node->tcp_cntxt.snd_wscale =
1642 all_options->as_windowscale.shiftcount;
1643 break;
1644 default:
1645 nes_debug(NES_DBG_CM, "TCP Option not understood: %x\n",
1646 all_options->as_base.optionnum);
1647 break;
1648 }
1649 offset += all_options->as_base.length;
1650 }
1651 if ((!got_mss_option) && (syn_packet))
1652 cm_node->tcp_cntxt.mss = NES_CM_DEFAULT_MSS;
1653 return 0;
1654 }
1655
drop_packet(struct sk_buff * skb)1656 static void drop_packet(struct sk_buff *skb)
1657 {
1658 atomic_inc(&cm_accel_dropped_pkts);
1659 dev_kfree_skb_any(skb);
1660 }
1661
handle_fin_pkt(struct nes_cm_node * cm_node)1662 static void handle_fin_pkt(struct nes_cm_node *cm_node)
1663 {
1664 nes_debug(NES_DBG_CM, "Received FIN, cm_node = %p, state = %u. "
1665 "refcnt=%d\n", cm_node, cm_node->state,
1666 atomic_read(&cm_node->ref_count));
1667 switch (cm_node->state) {
1668 case NES_CM_STATE_SYN_RCVD:
1669 case NES_CM_STATE_SYN_SENT:
1670 case NES_CM_STATE_ESTABLISHED:
1671 case NES_CM_STATE_MPAREJ_RCVD:
1672 cm_node->tcp_cntxt.rcv_nxt++;
1673 cleanup_retrans_entry(cm_node);
1674 cm_node->state = NES_CM_STATE_LAST_ACK;
1675 send_fin(cm_node, NULL);
1676 break;
1677 case NES_CM_STATE_MPAREQ_SENT:
1678 create_event(cm_node, NES_CM_EVENT_ABORTED);
1679 cm_node->tcp_cntxt.rcv_nxt++;
1680 cleanup_retrans_entry(cm_node);
1681 cm_node->state = NES_CM_STATE_CLOSED;
1682 add_ref_cm_node(cm_node);
1683 send_reset(cm_node, NULL);
1684 break;
1685 case NES_CM_STATE_FIN_WAIT1:
1686 cm_node->tcp_cntxt.rcv_nxt++;
1687 cleanup_retrans_entry(cm_node);
1688 cm_node->state = NES_CM_STATE_CLOSING;
1689 send_ack(cm_node, NULL);
1690 /* Wait for ACK as this is simultaneous close..
1691 * After we receive ACK, do not send anything..
1692 * Just rm the node.. Done.. */
1693 break;
1694 case NES_CM_STATE_FIN_WAIT2:
1695 cm_node->tcp_cntxt.rcv_nxt++;
1696 cleanup_retrans_entry(cm_node);
1697 cm_node->state = NES_CM_STATE_TIME_WAIT;
1698 send_ack(cm_node, NULL);
1699 schedule_nes_timer(cm_node, NULL, NES_TIMER_TYPE_CLOSE, 1, 0);
1700 break;
1701 case NES_CM_STATE_TIME_WAIT:
1702 cm_node->tcp_cntxt.rcv_nxt++;
1703 cleanup_retrans_entry(cm_node);
1704 cm_node->state = NES_CM_STATE_CLOSED;
1705 rem_ref_cm_node(cm_node->cm_core, cm_node);
1706 break;
1707 case NES_CM_STATE_TSA:
1708 default:
1709 nes_debug(NES_DBG_CM, "Error Rcvd FIN for node-%p state = %d\n",
1710 cm_node, cm_node->state);
1711 break;
1712 }
1713 }
1714
1715
handle_rst_pkt(struct nes_cm_node * cm_node,struct sk_buff * skb,struct tcphdr * tcph)1716 static void handle_rst_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1717 struct tcphdr *tcph)
1718 {
1719
1720 int reset = 0; /* whether to send reset in case of err.. */
1721 atomic_inc(&cm_resets_recvd);
1722 nes_debug(NES_DBG_CM, "Received Reset, cm_node = %p, state = %u."
1723 " refcnt=%d\n", cm_node, cm_node->state,
1724 atomic_read(&cm_node->ref_count));
1725 cleanup_retrans_entry(cm_node);
1726 switch (cm_node->state) {
1727 case NES_CM_STATE_SYN_SENT:
1728 case NES_CM_STATE_MPAREQ_SENT:
1729 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1730 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1731 cm_node->listener, cm_node->state);
1732 switch (cm_node->mpa_frame_rev) {
1733 case IETF_MPA_V2:
1734 cm_node->mpa_frame_rev = IETF_MPA_V1;
1735 /* send a syn and goto syn sent state */
1736 cm_node->state = NES_CM_STATE_SYN_SENT;
1737 if (send_syn(cm_node, 0, NULL)) {
1738 active_open_err(cm_node, skb, reset);
1739 }
1740 break;
1741 case IETF_MPA_V1:
1742 default:
1743 active_open_err(cm_node, skb, reset);
1744 break;
1745 }
1746 break;
1747 case NES_CM_STATE_MPAREQ_RCVD:
1748 atomic_inc(&cm_node->passive_state);
1749 dev_kfree_skb_any(skb);
1750 break;
1751 case NES_CM_STATE_ESTABLISHED:
1752 case NES_CM_STATE_SYN_RCVD:
1753 case NES_CM_STATE_LISTENING:
1754 nes_debug(NES_DBG_CM, "Bad state %s[%u]\n", __func__, __LINE__);
1755 passive_open_err(cm_node, skb, reset);
1756 break;
1757 case NES_CM_STATE_TSA:
1758 active_open_err(cm_node, skb, reset);
1759 break;
1760 case NES_CM_STATE_CLOSED:
1761 drop_packet(skb);
1762 break;
1763 case NES_CM_STATE_FIN_WAIT2:
1764 case NES_CM_STATE_FIN_WAIT1:
1765 case NES_CM_STATE_LAST_ACK:
1766 cm_node->cm_id->rem_ref(cm_node->cm_id);
1767 /* fall through */
1768 case NES_CM_STATE_TIME_WAIT:
1769 cm_node->state = NES_CM_STATE_CLOSED;
1770 rem_ref_cm_node(cm_node->cm_core, cm_node);
1771 drop_packet(skb);
1772 break;
1773 default:
1774 drop_packet(skb);
1775 break;
1776 }
1777 }
1778
1779
handle_rcv_mpa(struct nes_cm_node * cm_node,struct sk_buff * skb)1780 static void handle_rcv_mpa(struct nes_cm_node *cm_node, struct sk_buff *skb)
1781 {
1782 int ret = 0;
1783 int datasize = skb->len;
1784 u8 *dataloc = skb->data;
1785
1786 enum nes_cm_event_type type = NES_CM_EVENT_UNKNOWN;
1787 u32 res_type;
1788
1789 ret = parse_mpa(cm_node, dataloc, &res_type, datasize);
1790 if (ret) {
1791 nes_debug(NES_DBG_CM, "didn't like MPA Request\n");
1792 if (cm_node->state == NES_CM_STATE_MPAREQ_SENT) {
1793 nes_debug(NES_DBG_CM, "%s[%u] create abort for "
1794 "cm_node=%p listener=%p state=%d\n", __func__,
1795 __LINE__, cm_node, cm_node->listener,
1796 cm_node->state);
1797 active_open_err(cm_node, skb, 1);
1798 } else {
1799 passive_open_err(cm_node, skb, 1);
1800 }
1801 return;
1802 }
1803
1804 switch (cm_node->state) {
1805 case NES_CM_STATE_ESTABLISHED:
1806 if (res_type == NES_MPA_REQUEST_REJECT)
1807 /*BIG problem as we are receiving the MPA.. So should
1808 * not be REJECT.. This is Passive Open.. We can
1809 * only receive it Reject for Active Open...*/
1810 WARN_ON(1);
1811 cm_node->state = NES_CM_STATE_MPAREQ_RCVD;
1812 type = NES_CM_EVENT_MPA_REQ;
1813 atomic_set(&cm_node->passive_state,
1814 NES_PASSIVE_STATE_INDICATED);
1815 break;
1816 case NES_CM_STATE_MPAREQ_SENT:
1817 cleanup_retrans_entry(cm_node);
1818 if (res_type == NES_MPA_REQUEST_REJECT) {
1819 type = NES_CM_EVENT_MPA_REJECT;
1820 cm_node->state = NES_CM_STATE_MPAREJ_RCVD;
1821 } else {
1822 type = NES_CM_EVENT_CONNECTED;
1823 cm_node->state = NES_CM_STATE_TSA;
1824 }
1825 send_ack(cm_node, NULL);
1826 break;
1827 default:
1828 WARN_ON(1);
1829 break;
1830 }
1831 dev_kfree_skb_any(skb);
1832 create_event(cm_node, type);
1833 }
1834
indicate_pkt_err(struct nes_cm_node * cm_node,struct sk_buff * skb)1835 static void indicate_pkt_err(struct nes_cm_node *cm_node, struct sk_buff *skb)
1836 {
1837 switch (cm_node->state) {
1838 case NES_CM_STATE_SYN_SENT:
1839 case NES_CM_STATE_MPAREQ_SENT:
1840 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1841 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1842 cm_node->listener, cm_node->state);
1843 active_open_err(cm_node, skb, 1);
1844 break;
1845 case NES_CM_STATE_ESTABLISHED:
1846 case NES_CM_STATE_SYN_RCVD:
1847 passive_open_err(cm_node, skb, 1);
1848 break;
1849 case NES_CM_STATE_TSA:
1850 default:
1851 drop_packet(skb);
1852 }
1853 }
1854
check_syn(struct nes_cm_node * cm_node,struct tcphdr * tcph,struct sk_buff * skb)1855 static int check_syn(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1856 struct sk_buff *skb)
1857 {
1858 int err;
1859
1860 err = ((ntohl(tcph->ack_seq) == cm_node->tcp_cntxt.loc_seq_num)) ? 0 : 1;
1861 if (err)
1862 active_open_err(cm_node, skb, 1);
1863
1864 return err;
1865 }
1866
check_seq(struct nes_cm_node * cm_node,struct tcphdr * tcph,struct sk_buff * skb)1867 static int check_seq(struct nes_cm_node *cm_node, struct tcphdr *tcph,
1868 struct sk_buff *skb)
1869 {
1870 int err = 0;
1871 u32 seq;
1872 u32 ack_seq;
1873 u32 loc_seq_num = cm_node->tcp_cntxt.loc_seq_num;
1874 u32 rcv_nxt = cm_node->tcp_cntxt.rcv_nxt;
1875 u32 rcv_wnd;
1876
1877 seq = ntohl(tcph->seq);
1878 ack_seq = ntohl(tcph->ack_seq);
1879 rcv_wnd = cm_node->tcp_cntxt.rcv_wnd;
1880 if (ack_seq != loc_seq_num)
1881 err = 1;
1882 else if (!between(seq, rcv_nxt, (rcv_nxt + rcv_wnd)))
1883 err = 1;
1884 if (err) {
1885 nes_debug(NES_DBG_CM, "%s[%u] create abort for cm_node=%p "
1886 "listener=%p state=%d\n", __func__, __LINE__, cm_node,
1887 cm_node->listener, cm_node->state);
1888 indicate_pkt_err(cm_node, skb);
1889 nes_debug(NES_DBG_CM, "seq ERROR cm_node =%p seq=0x%08X "
1890 "rcv_nxt=0x%08X rcv_wnd=0x%x\n", cm_node, seq, rcv_nxt,
1891 rcv_wnd);
1892 }
1893 return err;
1894 }
1895
1896 /*
1897 * handle_syn_pkt() is for Passive node. The syn packet is received when a node
1898 * is created with a listener or it may comein as rexmitted packet which in
1899 * that case will be just dropped.
1900 */
handle_syn_pkt(struct nes_cm_node * cm_node,struct sk_buff * skb,struct tcphdr * tcph)1901 static void handle_syn_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1902 struct tcphdr *tcph)
1903 {
1904 int ret;
1905 u32 inc_sequence;
1906 int optionsize;
1907
1908 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1909 skb_trim(skb, 0);
1910 inc_sequence = ntohl(tcph->seq);
1911
1912 switch (cm_node->state) {
1913 case NES_CM_STATE_SYN_SENT:
1914 case NES_CM_STATE_MPAREQ_SENT:
1915 /* Rcvd syn on active open connection*/
1916 active_open_err(cm_node, skb, 1);
1917 break;
1918 case NES_CM_STATE_LISTENING:
1919 /* Passive OPEN */
1920 if (atomic_read(&cm_node->listener->pend_accepts_cnt) >
1921 cm_node->listener->backlog) {
1922 nes_debug(NES_DBG_CM, "drop syn due to backlog "
1923 "pressure \n");
1924 cm_backlog_drops++;
1925 passive_open_err(cm_node, skb, 0);
1926 break;
1927 }
1928 ret = handle_tcp_options(cm_node, tcph, skb, optionsize,
1929 1);
1930 if (ret) {
1931 passive_open_err(cm_node, skb, 0);
1932 /* drop pkt */
1933 break;
1934 }
1935 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1936 BUG_ON(cm_node->send_entry);
1937 cm_node->accept_pend = 1;
1938 atomic_inc(&cm_node->listener->pend_accepts_cnt);
1939
1940 cm_node->state = NES_CM_STATE_SYN_RCVD;
1941 send_syn(cm_node, 1, skb);
1942 break;
1943 case NES_CM_STATE_CLOSED:
1944 cleanup_retrans_entry(cm_node);
1945 add_ref_cm_node(cm_node);
1946 send_reset(cm_node, skb);
1947 break;
1948 case NES_CM_STATE_TSA:
1949 case NES_CM_STATE_ESTABLISHED:
1950 case NES_CM_STATE_FIN_WAIT1:
1951 case NES_CM_STATE_FIN_WAIT2:
1952 case NES_CM_STATE_MPAREQ_RCVD:
1953 case NES_CM_STATE_LAST_ACK:
1954 case NES_CM_STATE_CLOSING:
1955 case NES_CM_STATE_UNKNOWN:
1956 default:
1957 drop_packet(skb);
1958 break;
1959 }
1960 }
1961
handle_synack_pkt(struct nes_cm_node * cm_node,struct sk_buff * skb,struct tcphdr * tcph)1962 static void handle_synack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
1963 struct tcphdr *tcph)
1964 {
1965 int ret;
1966 u32 inc_sequence;
1967 int optionsize;
1968
1969 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
1970 skb_trim(skb, 0);
1971 inc_sequence = ntohl(tcph->seq);
1972 switch (cm_node->state) {
1973 case NES_CM_STATE_SYN_SENT:
1974 cleanup_retrans_entry(cm_node);
1975 /* active open */
1976 if (check_syn(cm_node, tcph, skb))
1977 return;
1978 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
1979 /* setup options */
1980 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 0);
1981 if (ret) {
1982 nes_debug(NES_DBG_CM, "cm_node=%p tcp_options failed\n",
1983 cm_node);
1984 break;
1985 }
1986 cleanup_retrans_entry(cm_node);
1987 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + 1;
1988 send_mpa_request(cm_node, skb);
1989 cm_node->state = NES_CM_STATE_MPAREQ_SENT;
1990 break;
1991 case NES_CM_STATE_MPAREQ_RCVD:
1992 /* passive open, so should not be here */
1993 passive_open_err(cm_node, skb, 1);
1994 break;
1995 case NES_CM_STATE_LISTENING:
1996 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
1997 cleanup_retrans_entry(cm_node);
1998 cm_node->state = NES_CM_STATE_CLOSED;
1999 send_reset(cm_node, skb);
2000 break;
2001 case NES_CM_STATE_CLOSED:
2002 cm_node->tcp_cntxt.loc_seq_num = ntohl(tcph->ack_seq);
2003 cleanup_retrans_entry(cm_node);
2004 add_ref_cm_node(cm_node);
2005 send_reset(cm_node, skb);
2006 break;
2007 case NES_CM_STATE_ESTABLISHED:
2008 case NES_CM_STATE_FIN_WAIT1:
2009 case NES_CM_STATE_FIN_WAIT2:
2010 case NES_CM_STATE_LAST_ACK:
2011 case NES_CM_STATE_TSA:
2012 case NES_CM_STATE_CLOSING:
2013 case NES_CM_STATE_UNKNOWN:
2014 case NES_CM_STATE_MPAREQ_SENT:
2015 default:
2016 drop_packet(skb);
2017 break;
2018 }
2019 }
2020
handle_ack_pkt(struct nes_cm_node * cm_node,struct sk_buff * skb,struct tcphdr * tcph)2021 static int handle_ack_pkt(struct nes_cm_node *cm_node, struct sk_buff *skb,
2022 struct tcphdr *tcph)
2023 {
2024 int datasize = 0;
2025 u32 inc_sequence;
2026 int ret = 0;
2027 int optionsize;
2028
2029 optionsize = (tcph->doff << 2) - sizeof(struct tcphdr);
2030
2031 if (check_seq(cm_node, tcph, skb))
2032 return -EINVAL;
2033
2034 skb_pull(skb, tcph->doff << 2);
2035 inc_sequence = ntohl(tcph->seq);
2036 datasize = skb->len;
2037 switch (cm_node->state) {
2038 case NES_CM_STATE_SYN_RCVD:
2039 /* Passive OPEN */
2040 cleanup_retrans_entry(cm_node);
2041 ret = handle_tcp_options(cm_node, tcph, skb, optionsize, 1);
2042 if (ret)
2043 break;
2044 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2045 cm_node->state = NES_CM_STATE_ESTABLISHED;
2046 if (datasize) {
2047 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2048 handle_rcv_mpa(cm_node, skb);
2049 } else { /* rcvd ACK only */
2050 dev_kfree_skb_any(skb);
2051 }
2052 break;
2053 case NES_CM_STATE_ESTABLISHED:
2054 /* Passive OPEN */
2055 cleanup_retrans_entry(cm_node);
2056 if (datasize) {
2057 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2058 handle_rcv_mpa(cm_node, skb);
2059 } else {
2060 drop_packet(skb);
2061 }
2062 break;
2063 case NES_CM_STATE_MPAREQ_SENT:
2064 cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
2065 if (datasize) {
2066 cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
2067 handle_rcv_mpa(cm_node, skb);
2068 } else { /* Could be just an ack pkt.. */
2069 dev_kfree_skb_any(skb);
2070 }
2071 break;
2072 case NES_CM_STATE_LISTENING:
2073 cleanup_retrans_entry(cm_node);
2074 cm_node->state = NES_CM_STATE_CLOSED;
2075 send_reset(cm_node, skb);
2076 break;
2077 case NES_CM_STATE_CLOSED:
2078 cleanup_retrans_entry(cm_node);
2079 add_ref_cm_node(cm_node);
2080 send_reset(cm_node, skb);
2081 break;
2082 case NES_CM_STATE_LAST_ACK:
2083 case NES_CM_STATE_CLOSING:
2084 cleanup_retrans_entry(cm_node);
2085 cm_node->state = NES_CM_STATE_CLOSED;
2086 cm_node->cm_id->rem_ref(cm_node->cm_id);
2087 rem_ref_cm_node(cm_node->cm_core, cm_node);
2088 drop_packet(skb);
2089 break;
2090 case NES_CM_STATE_FIN_WAIT1:
2091 cleanup_retrans_entry(cm_node);
2092 drop_packet(skb);
2093 cm_node->state = NES_CM_STATE_FIN_WAIT2;
2094 break;
2095 case NES_CM_STATE_SYN_SENT:
2096 case NES_CM_STATE_FIN_WAIT2:
2097 case NES_CM_STATE_TSA:
2098 case NES_CM_STATE_MPAREQ_RCVD:
2099 case NES_CM_STATE_UNKNOWN:
2100 default:
2101 cleanup_retrans_entry(cm_node);
2102 drop_packet(skb);
2103 break;
2104 }
2105 return ret;
2106 }
2107
2108
2109
handle_tcp_options(struct nes_cm_node * cm_node,struct tcphdr * tcph,struct sk_buff * skb,int optionsize,int passive)2110 static int handle_tcp_options(struct nes_cm_node *cm_node, struct tcphdr *tcph,
2111 struct sk_buff *skb, int optionsize, int passive)
2112 {
2113 u8 *optionsloc = (u8 *)&tcph[1];
2114
2115 if (optionsize) {
2116 if (process_options(cm_node, optionsloc, optionsize,
2117 (u32)tcph->syn)) {
2118 nes_debug(NES_DBG_CM, "%s: Node %p, Sending RESET\n",
2119 __func__, cm_node);
2120 if (passive)
2121 passive_open_err(cm_node, skb, 1);
2122 else
2123 active_open_err(cm_node, skb, 1);
2124 return 1;
2125 }
2126 }
2127
2128 cm_node->tcp_cntxt.snd_wnd = ntohs(tcph->window) <<
2129 cm_node->tcp_cntxt.snd_wscale;
2130
2131 if (cm_node->tcp_cntxt.snd_wnd > cm_node->tcp_cntxt.max_snd_wnd)
2132 cm_node->tcp_cntxt.max_snd_wnd = cm_node->tcp_cntxt.snd_wnd;
2133 return 0;
2134 }
2135
2136 /*
2137 * active_open_err() will send reset() if flag set..
2138 * It will also send ABORT event.
2139 */
active_open_err(struct nes_cm_node * cm_node,struct sk_buff * skb,int reset)2140 static void active_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2141 int reset)
2142 {
2143 cleanup_retrans_entry(cm_node);
2144 if (reset) {
2145 nes_debug(NES_DBG_CM, "ERROR active err called for cm_node=%p, "
2146 "state=%d\n", cm_node, cm_node->state);
2147 add_ref_cm_node(cm_node);
2148 send_reset(cm_node, skb);
2149 } else {
2150 dev_kfree_skb_any(skb);
2151 }
2152
2153 cm_node->state = NES_CM_STATE_CLOSED;
2154 create_event(cm_node, NES_CM_EVENT_ABORTED);
2155 }
2156
2157 /*
2158 * passive_open_err() will either do a reset() or will free up the skb and
2159 * remove the cm_node.
2160 */
passive_open_err(struct nes_cm_node * cm_node,struct sk_buff * skb,int reset)2161 static void passive_open_err(struct nes_cm_node *cm_node, struct sk_buff *skb,
2162 int reset)
2163 {
2164 cleanup_retrans_entry(cm_node);
2165 cm_node->state = NES_CM_STATE_CLOSED;
2166 if (reset) {
2167 nes_debug(NES_DBG_CM, "passive_open_err sending RST for "
2168 "cm_node=%p state =%d\n", cm_node, cm_node->state);
2169 send_reset(cm_node, skb);
2170 } else {
2171 dev_kfree_skb_any(skb);
2172 rem_ref_cm_node(cm_node->cm_core, cm_node);
2173 }
2174 }
2175
2176 /*
2177 * free_retrans_entry() routines assumes that the retrans_list_lock has
2178 * been acquired before calling.
2179 */
free_retrans_entry(struct nes_cm_node * cm_node)2180 static void free_retrans_entry(struct nes_cm_node *cm_node)
2181 {
2182 struct nes_timer_entry *send_entry;
2183
2184 send_entry = cm_node->send_entry;
2185 if (send_entry) {
2186 cm_node->send_entry = NULL;
2187 dev_kfree_skb_any(send_entry->skb);
2188 kfree(send_entry);
2189 rem_ref_cm_node(cm_node->cm_core, cm_node);
2190 }
2191 }
2192
cleanup_retrans_entry(struct nes_cm_node * cm_node)2193 static void cleanup_retrans_entry(struct nes_cm_node *cm_node)
2194 {
2195 unsigned long flags;
2196
2197 spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
2198 free_retrans_entry(cm_node);
2199 spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
2200 }
2201
2202 /**
2203 * process_packet
2204 * Returns skb if to be freed, else it will return NULL if already used..
2205 */
process_packet(struct nes_cm_node * cm_node,struct sk_buff * skb,struct nes_cm_core * cm_core)2206 static void process_packet(struct nes_cm_node *cm_node, struct sk_buff *skb,
2207 struct nes_cm_core *cm_core)
2208 {
2209 enum nes_tcpip_pkt_type pkt_type = NES_PKT_TYPE_UNKNOWN;
2210 struct tcphdr *tcph = tcp_hdr(skb);
2211 u32 fin_set = 0;
2212 int ret = 0;
2213
2214 skb_pull(skb, ip_hdr(skb)->ihl << 2);
2215
2216 nes_debug(NES_DBG_CM, "process_packet: cm_node=%p state =%d syn=%d "
2217 "ack=%d rst=%d fin=%d\n", cm_node, cm_node->state, tcph->syn,
2218 tcph->ack, tcph->rst, tcph->fin);
2219
2220 if (tcph->rst) {
2221 pkt_type = NES_PKT_TYPE_RST;
2222 } else if (tcph->syn) {
2223 pkt_type = NES_PKT_TYPE_SYN;
2224 if (tcph->ack)
2225 pkt_type = NES_PKT_TYPE_SYNACK;
2226 } else if (tcph->ack) {
2227 pkt_type = NES_PKT_TYPE_ACK;
2228 }
2229 if (tcph->fin)
2230 fin_set = 1;
2231
2232 switch (pkt_type) {
2233 case NES_PKT_TYPE_SYN:
2234 handle_syn_pkt(cm_node, skb, tcph);
2235 break;
2236 case NES_PKT_TYPE_SYNACK:
2237 handle_synack_pkt(cm_node, skb, tcph);
2238 break;
2239 case NES_PKT_TYPE_ACK:
2240 ret = handle_ack_pkt(cm_node, skb, tcph);
2241 if (fin_set && !ret)
2242 handle_fin_pkt(cm_node);
2243 break;
2244 case NES_PKT_TYPE_RST:
2245 handle_rst_pkt(cm_node, skb, tcph);
2246 break;
2247 default:
2248 if ((fin_set) && (!check_seq(cm_node, tcph, skb)))
2249 handle_fin_pkt(cm_node);
2250 drop_packet(skb);
2251 break;
2252 }
2253 }
2254
2255 /**
2256 * mini_cm_listen - create a listen node with params
2257 */
mini_cm_listen(struct nes_cm_core * cm_core,struct nes_vnic * nesvnic,struct nes_cm_info * cm_info)2258 static struct nes_cm_listener *mini_cm_listen(struct nes_cm_core *cm_core,
2259 struct nes_vnic *nesvnic, struct nes_cm_info *cm_info)
2260 {
2261 struct nes_cm_listener *listener;
2262 unsigned long flags;
2263
2264 nes_debug(NES_DBG_CM, "Search for 0x%08x : 0x%04x\n",
2265 cm_info->loc_addr, cm_info->loc_port);
2266
2267 /* cannot have multiple matching listeners */
2268 listener = find_listener(cm_core, cm_info->loc_addr, cm_info->loc_port,
2269 NES_CM_LISTENER_EITHER_STATE);
2270
2271 if (listener && listener->listener_state == NES_CM_LISTENER_ACTIVE_STATE) {
2272 /* find automatically incs ref count ??? */
2273 atomic_dec(&listener->ref_count);
2274 nes_debug(NES_DBG_CM, "Not creating listener since it already exists\n");
2275 return NULL;
2276 }
2277
2278 if (!listener) {
2279 /* create a CM listen node (1/2 node to compare incoming traffic to) */
2280 listener = kzalloc(sizeof(*listener), GFP_ATOMIC);
2281 if (!listener)
2282 return NULL;
2283
2284 listener->loc_addr = cm_info->loc_addr;
2285 listener->loc_port = cm_info->loc_port;
2286 listener->reused_node = 0;
2287
2288 atomic_set(&listener->ref_count, 1);
2289 }
2290 /* pasive case */
2291 /* find already inc'ed the ref count */
2292 else {
2293 listener->reused_node = 1;
2294 }
2295
2296 listener->cm_id = cm_info->cm_id;
2297 atomic_set(&listener->pend_accepts_cnt, 0);
2298 listener->cm_core = cm_core;
2299 listener->nesvnic = nesvnic;
2300 atomic_inc(&cm_core->node_cnt);
2301
2302 listener->conn_type = cm_info->conn_type;
2303 listener->backlog = cm_info->backlog;
2304 listener->listener_state = NES_CM_LISTENER_ACTIVE_STATE;
2305
2306 if (!listener->reused_node) {
2307 spin_lock_irqsave(&cm_core->listen_list_lock, flags);
2308 list_add(&listener->list, &cm_core->listen_list.list);
2309 spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
2310 atomic_inc(&cm_core->listen_node_cnt);
2311 }
2312
2313 nes_debug(NES_DBG_CM, "Api - listen(): addr=0x%08X, port=0x%04x,"
2314 " listener = %p, backlog = %d, cm_id = %p.\n",
2315 cm_info->loc_addr, cm_info->loc_port,
2316 listener, listener->backlog, listener->cm_id);
2317
2318 return listener;
2319 }
2320
2321
2322 /**
2323 * mini_cm_connect - make a connection node with params
2324 */
mini_cm_connect(struct nes_cm_core * cm_core,struct nes_vnic * nesvnic,u16 private_data_len,void * private_data,struct nes_cm_info * cm_info)2325 static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
2326 struct nes_vnic *nesvnic, u16 private_data_len,
2327 void *private_data, struct nes_cm_info *cm_info)
2328 {
2329 int ret = 0;
2330 struct nes_cm_node *cm_node;
2331 struct nes_cm_listener *loopbackremotelistener;
2332 struct nes_cm_node *loopbackremotenode;
2333 struct nes_cm_info loopback_cm_info;
2334 u8 *start_buff;
2335
2336 /* create a CM connection node */
2337 cm_node = make_cm_node(cm_core, nesvnic, cm_info, NULL);
2338 if (!cm_node)
2339 return NULL;
2340
2341 /* set our node side to client (active) side */
2342 cm_node->tcp_cntxt.client = 1;
2343 cm_node->tcp_cntxt.rcv_wscale = NES_CM_DEFAULT_RCV_WND_SCALE;
2344
2345 if (cm_info->loc_addr == cm_info->rem_addr) {
2346 loopbackremotelistener = find_listener(cm_core,
2347 cm_node->loc_addr, cm_node->rem_port,
2348 NES_CM_LISTENER_ACTIVE_STATE);
2349 if (loopbackremotelistener == NULL) {
2350 create_event(cm_node, NES_CM_EVENT_ABORTED);
2351 } else {
2352 loopback_cm_info = *cm_info;
2353 loopback_cm_info.loc_port = cm_info->rem_port;
2354 loopback_cm_info.rem_port = cm_info->loc_port;
2355 loopback_cm_info.loc_port =
2356 cm_info->rem_port;
2357 loopback_cm_info.rem_port =
2358 cm_info->loc_port;
2359 loopback_cm_info.cm_id = loopbackremotelistener->cm_id;
2360 loopbackremotenode = make_cm_node(cm_core, nesvnic,
2361 &loopback_cm_info, loopbackremotelistener);
2362 if (!loopbackremotenode) {
2363 rem_ref_cm_node(cm_node->cm_core, cm_node);
2364 return NULL;
2365 }
2366 atomic_inc(&cm_loopbacks);
2367 loopbackremotenode->loopbackpartner = cm_node;
2368 loopbackremotenode->tcp_cntxt.rcv_wscale =
2369 NES_CM_DEFAULT_RCV_WND_SCALE;
2370 cm_node->loopbackpartner = loopbackremotenode;
2371 memcpy(loopbackremotenode->mpa_frame_buf, private_data,
2372 private_data_len);
2373 loopbackremotenode->mpa_frame_size = private_data_len;
2374
2375 /* we are done handling this state. */
2376 /* set node to a TSA state */
2377 cm_node->state = NES_CM_STATE_TSA;
2378 cm_node->tcp_cntxt.rcv_nxt =
2379 loopbackremotenode->tcp_cntxt.loc_seq_num;
2380 loopbackremotenode->tcp_cntxt.rcv_nxt =
2381 cm_node->tcp_cntxt.loc_seq_num;
2382 cm_node->tcp_cntxt.max_snd_wnd =
2383 loopbackremotenode->tcp_cntxt.rcv_wnd;
2384 loopbackremotenode->tcp_cntxt.max_snd_wnd =
2385 cm_node->tcp_cntxt.rcv_wnd;
2386 cm_node->tcp_cntxt.snd_wnd =
2387 loopbackremotenode->tcp_cntxt.rcv_wnd;
2388 loopbackremotenode->tcp_cntxt.snd_wnd =
2389 cm_node->tcp_cntxt.rcv_wnd;
2390 cm_node->tcp_cntxt.snd_wscale =
2391 loopbackremotenode->tcp_cntxt.rcv_wscale;
2392 loopbackremotenode->tcp_cntxt.snd_wscale =
2393 cm_node->tcp_cntxt.rcv_wscale;
2394 loopbackremotenode->state = NES_CM_STATE_MPAREQ_RCVD;
2395 create_event(loopbackremotenode, NES_CM_EVENT_MPA_REQ);
2396 }
2397 return cm_node;
2398 }
2399
2400 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
2401 cm_node->mpa_frame_size = private_data_len;
2402
2403 memcpy(start_buff, private_data, private_data_len);
2404
2405 /* send a syn and goto syn sent state */
2406 cm_node->state = NES_CM_STATE_SYN_SENT;
2407 ret = send_syn(cm_node, 0, NULL);
2408
2409 if (ret) {
2410 /* error in sending the syn free up the cm_node struct */
2411 nes_debug(NES_DBG_CM, "Api - connect() FAILED: dest "
2412 "addr=0x%08X, port=0x%04x, cm_node=%p, cm_id = %p.\n",
2413 cm_node->rem_addr, cm_node->rem_port, cm_node,
2414 cm_node->cm_id);
2415 rem_ref_cm_node(cm_node->cm_core, cm_node);
2416 cm_node = NULL;
2417 }
2418
2419 if (cm_node) {
2420 nes_debug(NES_DBG_CM, "Api - connect(): dest addr=0x%08X,"
2421 "port=0x%04x, cm_node=%p, cm_id = %p.\n",
2422 cm_node->rem_addr, cm_node->rem_port, cm_node,
2423 cm_node->cm_id);
2424 }
2425
2426 return cm_node;
2427 }
2428
2429
2430 /**
2431 * mini_cm_accept - accept a connection
2432 * This function is never called
2433 */
mini_cm_accept(struct nes_cm_core * cm_core,struct nes_cm_node * cm_node)2434 static int mini_cm_accept(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2435 {
2436 return 0;
2437 }
2438
2439
2440 /**
2441 * mini_cm_reject - reject and teardown a connection
2442 */
mini_cm_reject(struct nes_cm_core * cm_core,struct nes_cm_node * cm_node)2443 static int mini_cm_reject(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2444 {
2445 int ret = 0;
2446 int err = 0;
2447 int passive_state;
2448 struct nes_cm_event event;
2449 struct iw_cm_id *cm_id = cm_node->cm_id;
2450 struct nes_cm_node *loopback = cm_node->loopbackpartner;
2451
2452 nes_debug(NES_DBG_CM, "%s cm_node=%p type=%d state=%d\n",
2453 __func__, cm_node, cm_node->tcp_cntxt.client, cm_node->state);
2454
2455 if (cm_node->tcp_cntxt.client)
2456 return ret;
2457 cleanup_retrans_entry(cm_node);
2458
2459 if (!loopback) {
2460 passive_state = atomic_add_return(1, &cm_node->passive_state);
2461 if (passive_state == NES_SEND_RESET_EVENT) {
2462 cm_node->state = NES_CM_STATE_CLOSED;
2463 rem_ref_cm_node(cm_core, cm_node);
2464 } else {
2465 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2466 rem_ref_cm_node(cm_core, cm_node);
2467 } else {
2468 ret = send_mpa_reject(cm_node);
2469 if (ret) {
2470 cm_node->state = NES_CM_STATE_CLOSED;
2471 err = send_reset(cm_node, NULL);
2472 if (err)
2473 WARN_ON(1);
2474 } else {
2475 cm_id->add_ref(cm_id);
2476 }
2477 }
2478 }
2479 } else {
2480 cm_node->cm_id = NULL;
2481 if (cm_node->state == NES_CM_STATE_LISTENER_DESTROYED) {
2482 rem_ref_cm_node(cm_core, cm_node);
2483 rem_ref_cm_node(cm_core, loopback);
2484 } else {
2485 event.cm_node = loopback;
2486 event.cm_info.rem_addr = loopback->rem_addr;
2487 event.cm_info.loc_addr = loopback->loc_addr;
2488 event.cm_info.rem_port = loopback->rem_port;
2489 event.cm_info.loc_port = loopback->loc_port;
2490 event.cm_info.cm_id = loopback->cm_id;
2491 cm_event_mpa_reject(&event);
2492 rem_ref_cm_node(cm_core, cm_node);
2493 loopback->state = NES_CM_STATE_CLOSING;
2494
2495 cm_id = loopback->cm_id;
2496 rem_ref_cm_node(cm_core, loopback);
2497 cm_id->rem_ref(cm_id);
2498 }
2499 }
2500
2501 return ret;
2502 }
2503
2504
2505 /**
2506 * mini_cm_close
2507 */
mini_cm_close(struct nes_cm_core * cm_core,struct nes_cm_node * cm_node)2508 static int mini_cm_close(struct nes_cm_core *cm_core, struct nes_cm_node *cm_node)
2509 {
2510 int ret = 0;
2511
2512 if (!cm_core || !cm_node)
2513 return -EINVAL;
2514
2515 switch (cm_node->state) {
2516 case NES_CM_STATE_SYN_RCVD:
2517 case NES_CM_STATE_SYN_SENT:
2518 case NES_CM_STATE_ONE_SIDE_ESTABLISHED:
2519 case NES_CM_STATE_ESTABLISHED:
2520 case NES_CM_STATE_ACCEPTING:
2521 case NES_CM_STATE_MPAREQ_SENT:
2522 case NES_CM_STATE_MPAREQ_RCVD:
2523 cleanup_retrans_entry(cm_node);
2524 send_reset(cm_node, NULL);
2525 break;
2526 case NES_CM_STATE_CLOSE_WAIT:
2527 cm_node->state = NES_CM_STATE_LAST_ACK;
2528 send_fin(cm_node, NULL);
2529 break;
2530 case NES_CM_STATE_FIN_WAIT1:
2531 case NES_CM_STATE_FIN_WAIT2:
2532 case NES_CM_STATE_LAST_ACK:
2533 case NES_CM_STATE_TIME_WAIT:
2534 case NES_CM_STATE_CLOSING:
2535 ret = -1;
2536 break;
2537 case NES_CM_STATE_LISTENING:
2538 cleanup_retrans_entry(cm_node);
2539 send_reset(cm_node, NULL);
2540 break;
2541 case NES_CM_STATE_MPAREJ_RCVD:
2542 case NES_CM_STATE_UNKNOWN:
2543 case NES_CM_STATE_INITED:
2544 case NES_CM_STATE_CLOSED:
2545 case NES_CM_STATE_LISTENER_DESTROYED:
2546 ret = rem_ref_cm_node(cm_core, cm_node);
2547 break;
2548 case NES_CM_STATE_TSA:
2549 if (cm_node->send_entry)
2550 printk(KERN_ERR "ERROR Close got called from STATE_TSA "
2551 "send_entry=%p\n", cm_node->send_entry);
2552 ret = rem_ref_cm_node(cm_core, cm_node);
2553 break;
2554 }
2555 return ret;
2556 }
2557
2558
2559 /**
2560 * recv_pkt - recv an ETHERNET packet, and process it through CM
2561 * node state machine
2562 */
mini_cm_recv_pkt(struct nes_cm_core * cm_core,struct nes_vnic * nesvnic,struct sk_buff * skb)2563 static int mini_cm_recv_pkt(struct nes_cm_core *cm_core,
2564 struct nes_vnic *nesvnic, struct sk_buff *skb)
2565 {
2566 struct nes_cm_node *cm_node = NULL;
2567 struct nes_cm_listener *listener = NULL;
2568 struct iphdr *iph;
2569 struct tcphdr *tcph;
2570 struct nes_cm_info nfo;
2571 int skb_handled = 1;
2572 __be32 tmp_daddr, tmp_saddr;
2573
2574 if (!skb)
2575 return 0;
2576 if (skb->len < sizeof(struct iphdr) + sizeof(struct tcphdr))
2577 return 0;
2578
2579 iph = (struct iphdr *)skb->data;
2580 tcph = (struct tcphdr *)(skb->data + sizeof(struct iphdr));
2581
2582 nfo.loc_addr = ntohl(iph->daddr);
2583 nfo.loc_port = ntohs(tcph->dest);
2584 nfo.rem_addr = ntohl(iph->saddr);
2585 nfo.rem_port = ntohs(tcph->source);
2586
2587 tmp_daddr = cpu_to_be32(iph->daddr);
2588 tmp_saddr = cpu_to_be32(iph->saddr);
2589
2590 nes_debug(NES_DBG_CM, "Received packet: dest=%pI4:0x%04X src=%pI4:0x%04X\n",
2591 &tmp_daddr, tcph->dest, &tmp_saddr, tcph->source);
2592
2593 do {
2594 cm_node = find_node(cm_core,
2595 nfo.rem_port, nfo.rem_addr,
2596 nfo.loc_port, nfo.loc_addr);
2597
2598 if (!cm_node) {
2599 /* Only type of packet accepted are for */
2600 /* the PASSIVE open (syn only) */
2601 if ((!tcph->syn) || (tcph->ack)) {
2602 skb_handled = 0;
2603 break;
2604 }
2605 listener = find_listener(cm_core, nfo.loc_addr,
2606 nfo.loc_port,
2607 NES_CM_LISTENER_ACTIVE_STATE);
2608 if (!listener) {
2609 nfo.cm_id = NULL;
2610 nfo.conn_type = 0;
2611 nes_debug(NES_DBG_CM, "Unable to find listener for the pkt\n");
2612 skb_handled = 0;
2613 break;
2614 }
2615 nfo.cm_id = listener->cm_id;
2616 nfo.conn_type = listener->conn_type;
2617 cm_node = make_cm_node(cm_core, nesvnic, &nfo,
2618 listener);
2619 if (!cm_node) {
2620 nes_debug(NES_DBG_CM, "Unable to allocate "
2621 "node\n");
2622 cm_packets_dropped++;
2623 atomic_dec(&listener->ref_count);
2624 dev_kfree_skb_any(skb);
2625 break;
2626 }
2627 if (!tcph->rst && !tcph->fin) {
2628 cm_node->state = NES_CM_STATE_LISTENING;
2629 } else {
2630 cm_packets_dropped++;
2631 rem_ref_cm_node(cm_core, cm_node);
2632 dev_kfree_skb_any(skb);
2633 break;
2634 }
2635 add_ref_cm_node(cm_node);
2636 } else if (cm_node->state == NES_CM_STATE_TSA) {
2637 if (cm_node->nesqp->pau_mode)
2638 nes_queue_mgt_skbs(skb, nesvnic, cm_node->nesqp);
2639 else {
2640 rem_ref_cm_node(cm_core, cm_node);
2641 atomic_inc(&cm_accel_dropped_pkts);
2642 dev_kfree_skb_any(skb);
2643 }
2644 break;
2645 }
2646 skb_reset_network_header(skb);
2647 skb_set_transport_header(skb, sizeof(*tcph));
2648 skb->len = ntohs(iph->tot_len);
2649 process_packet(cm_node, skb, cm_core);
2650 rem_ref_cm_node(cm_core, cm_node);
2651 } while (0);
2652 return skb_handled;
2653 }
2654
2655
2656 /**
2657 * nes_cm_alloc_core - allocate a top level instance of a cm core
2658 */
nes_cm_alloc_core(void)2659 static struct nes_cm_core *nes_cm_alloc_core(void)
2660 {
2661 struct nes_cm_core *cm_core;
2662
2663 /* setup the CM core */
2664 /* alloc top level core control structure */
2665 cm_core = kzalloc(sizeof(*cm_core), GFP_KERNEL);
2666 if (!cm_core)
2667 return NULL;
2668
2669 INIT_LIST_HEAD(&cm_core->connected_nodes);
2670 timer_setup(&cm_core->tcp_timer, nes_cm_timer_tick, 0);
2671
2672 cm_core->mtu = NES_CM_DEFAULT_MTU;
2673 cm_core->state = NES_CM_STATE_INITED;
2674 cm_core->free_tx_pkt_max = NES_CM_DEFAULT_FREE_PKTS;
2675
2676 atomic_set(&cm_core->events_posted, 0);
2677
2678 cm_core->api = &nes_cm_api;
2679
2680 spin_lock_init(&cm_core->ht_lock);
2681 spin_lock_init(&cm_core->listen_list_lock);
2682
2683 INIT_LIST_HEAD(&cm_core->listen_list.list);
2684
2685 nes_debug(NES_DBG_CM, "Init CM Core completed -- cm_core=%p\n", cm_core);
2686
2687 nes_debug(NES_DBG_CM, "Enable QUEUE EVENTS\n");
2688 cm_core->event_wq = alloc_ordered_workqueue("nesewq", 0);
2689 if (!cm_core->event_wq)
2690 goto out_free_cmcore;
2691 cm_core->post_event = nes_cm_post_event;
2692 nes_debug(NES_DBG_CM, "Enable QUEUE DISCONNECTS\n");
2693 cm_core->disconn_wq = alloc_ordered_workqueue("nesdwq", 0);
2694 if (!cm_core->disconn_wq)
2695 goto out_free_wq;
2696
2697 print_core(cm_core);
2698 return cm_core;
2699
2700 out_free_wq:
2701 destroy_workqueue(cm_core->event_wq);
2702 out_free_cmcore:
2703 kfree(cm_core);
2704 return NULL;
2705 }
2706
2707
2708 /**
2709 * mini_cm_dealloc_core - deallocate a top level instance of a cm core
2710 */
mini_cm_dealloc_core(struct nes_cm_core * cm_core)2711 static int mini_cm_dealloc_core(struct nes_cm_core *cm_core)
2712 {
2713 nes_debug(NES_DBG_CM, "De-Alloc CM Core (%p)\n", cm_core);
2714
2715 if (!cm_core)
2716 return -EINVAL;
2717
2718 barrier();
2719
2720 if (timer_pending(&cm_core->tcp_timer))
2721 del_timer(&cm_core->tcp_timer);
2722
2723 destroy_workqueue(cm_core->event_wq);
2724 destroy_workqueue(cm_core->disconn_wq);
2725 nes_debug(NES_DBG_CM, "\n");
2726 kfree(cm_core);
2727
2728 return 0;
2729 }
2730
2731
2732 /**
2733 * mini_cm_get
2734 */
mini_cm_get(struct nes_cm_core * cm_core)2735 static int mini_cm_get(struct nes_cm_core *cm_core)
2736 {
2737 return cm_core->state;
2738 }
2739
2740
2741 /**
2742 * mini_cm_set
2743 */
mini_cm_set(struct nes_cm_core * cm_core,u32 type,u32 value)2744 static int mini_cm_set(struct nes_cm_core *cm_core, u32 type, u32 value)
2745 {
2746 int ret = 0;
2747
2748 switch (type) {
2749 case NES_CM_SET_PKT_SIZE:
2750 cm_core->mtu = value;
2751 break;
2752 case NES_CM_SET_FREE_PKT_Q_SIZE:
2753 cm_core->free_tx_pkt_max = value;
2754 break;
2755 default:
2756 /* unknown set option */
2757 ret = -EINVAL;
2758 }
2759
2760 return ret;
2761 }
2762
2763
2764 /**
2765 * nes_cm_init_tsa_conn setup HW; MPA frames must be
2766 * successfully exchanged when this is called
2767 */
nes_cm_init_tsa_conn(struct nes_qp * nesqp,struct nes_cm_node * cm_node)2768 static int nes_cm_init_tsa_conn(struct nes_qp *nesqp, struct nes_cm_node *cm_node)
2769 {
2770 int ret = 0;
2771
2772 if (!nesqp)
2773 return -EINVAL;
2774
2775 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_IPV4 |
2776 NES_QPCONTEXT_MISC_NO_NAGLE | NES_QPCONTEXT_MISC_DO_NOT_FRAG |
2777 NES_QPCONTEXT_MISC_DROS);
2778
2779 if (cm_node->tcp_cntxt.snd_wscale || cm_node->tcp_cntxt.rcv_wscale)
2780 nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_WSCALE);
2781
2782 nesqp->nesqp_context->misc2 |= cpu_to_le32(64 << NES_QPCONTEXT_MISC2_TTL_SHIFT);
2783
2784 nesqp->nesqp_context->misc2 |= cpu_to_le32(
2785 cm_node->tos << NES_QPCONTEXT_MISC2_TOS_SHIFT);
2786
2787 nesqp->nesqp_context->mss |= cpu_to_le32(((u32)cm_node->tcp_cntxt.mss) << 16);
2788
2789 nesqp->nesqp_context->tcp_state_flow_label |= cpu_to_le32(
2790 (u32)NES_QPCONTEXT_TCPSTATE_EST << NES_QPCONTEXT_TCPFLOW_TCP_STATE_SHIFT);
2791
2792 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2793 (cm_node->tcp_cntxt.snd_wscale << NES_QPCONTEXT_PDWSCALE_SND_WSCALE_SHIFT) &
2794 NES_QPCONTEXT_PDWSCALE_SND_WSCALE_MASK);
2795
2796 nesqp->nesqp_context->pd_index_wscale |= cpu_to_le32(
2797 (cm_node->tcp_cntxt.rcv_wscale << NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_SHIFT) &
2798 NES_QPCONTEXT_PDWSCALE_RCV_WSCALE_MASK);
2799
2800 nesqp->nesqp_context->keepalive = cpu_to_le32(0x80);
2801 nesqp->nesqp_context->ts_recent = 0;
2802 nesqp->nesqp_context->ts_age = 0;
2803 nesqp->nesqp_context->snd_nxt = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2804 nesqp->nesqp_context->snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.snd_wnd);
2805 nesqp->nesqp_context->rcv_nxt = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2806 nesqp->nesqp_context->rcv_wnd = cpu_to_le32(cm_node->tcp_cntxt.rcv_wnd <<
2807 cm_node->tcp_cntxt.rcv_wscale);
2808 nesqp->nesqp_context->snd_max = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2809 nesqp->nesqp_context->snd_una = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2810 nesqp->nesqp_context->srtt = 0;
2811 nesqp->nesqp_context->rttvar = cpu_to_le32(0x6);
2812 nesqp->nesqp_context->ssthresh = cpu_to_le32(0x3FFFC000);
2813 nesqp->nesqp_context->cwnd = cpu_to_le32(2 * cm_node->tcp_cntxt.mss);
2814 nesqp->nesqp_context->snd_wl1 = cpu_to_le32(cm_node->tcp_cntxt.rcv_nxt);
2815 nesqp->nesqp_context->snd_wl2 = cpu_to_le32(cm_node->tcp_cntxt.loc_seq_num);
2816 nesqp->nesqp_context->max_snd_wnd = cpu_to_le32(cm_node->tcp_cntxt.max_snd_wnd);
2817
2818 nes_debug(NES_DBG_CM, "QP%u: rcv_nxt = 0x%08X, snd_nxt = 0x%08X,"
2819 " Setting MSS to %u, PDWscale = 0x%08X, rcv_wnd = %u, context misc = 0x%08X.\n",
2820 nesqp->hwqp.qp_id, le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
2821 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
2822 cm_node->tcp_cntxt.mss, le32_to_cpu(nesqp->nesqp_context->pd_index_wscale),
2823 le32_to_cpu(nesqp->nesqp_context->rcv_wnd),
2824 le32_to_cpu(nesqp->nesqp_context->misc));
2825 nes_debug(NES_DBG_CM, " snd_wnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->snd_wnd));
2826 nes_debug(NES_DBG_CM, " snd_cwnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->cwnd));
2827 nes_debug(NES_DBG_CM, " max_swnd = 0x%08X.\n", le32_to_cpu(nesqp->nesqp_context->max_snd_wnd));
2828
2829 nes_debug(NES_DBG_CM, "Change cm_node state to TSA\n");
2830 cm_node->state = NES_CM_STATE_TSA;
2831
2832 return ret;
2833 }
2834
2835
2836 /**
2837 * nes_cm_disconn
2838 */
nes_cm_disconn(struct nes_qp * nesqp)2839 int nes_cm_disconn(struct nes_qp *nesqp)
2840 {
2841 struct disconn_work *work;
2842
2843 work = kzalloc(sizeof *work, GFP_ATOMIC);
2844 if (!work)
2845 return -ENOMEM; /* Timer will clean up */
2846
2847 nes_add_ref(&nesqp->ibqp);
2848 work->nesqp = nesqp;
2849 INIT_WORK(&work->work, nes_disconnect_worker);
2850 queue_work(g_cm_core->disconn_wq, &work->work);
2851 return 0;
2852 }
2853
2854
2855 /**
2856 * nes_disconnect_worker
2857 */
nes_disconnect_worker(struct work_struct * work)2858 static void nes_disconnect_worker(struct work_struct *work)
2859 {
2860 struct disconn_work *dwork = container_of(work, struct disconn_work, work);
2861 struct nes_qp *nesqp = dwork->nesqp;
2862
2863 kfree(dwork);
2864 nes_debug(NES_DBG_CM, "processing AEQE id 0x%04X for QP%u.\n",
2865 nesqp->last_aeq, nesqp->hwqp.qp_id);
2866 nes_cm_disconn_true(nesqp);
2867 nes_rem_ref(&nesqp->ibqp);
2868 }
2869
2870
2871 /**
2872 * nes_cm_disconn_true
2873 */
nes_cm_disconn_true(struct nes_qp * nesqp)2874 static int nes_cm_disconn_true(struct nes_qp *nesqp)
2875 {
2876 unsigned long flags;
2877 int ret = 0;
2878 struct iw_cm_id *cm_id;
2879 struct iw_cm_event cm_event;
2880 struct nes_vnic *nesvnic;
2881 u16 last_ae;
2882 u8 original_hw_tcp_state;
2883 u8 original_ibqp_state;
2884 int disconn_status = 0;
2885 int issue_disconn = 0;
2886 int issue_close = 0;
2887 int issue_flush = 0;
2888 u32 flush_q = NES_CQP_FLUSH_RQ;
2889 struct ib_event ibevent;
2890
2891 if (!nesqp) {
2892 nes_debug(NES_DBG_CM, "disconnect_worker nesqp is NULL\n");
2893 return -1;
2894 }
2895
2896 spin_lock_irqsave(&nesqp->lock, flags);
2897 cm_id = nesqp->cm_id;
2898 /* make sure we havent already closed this connection */
2899 if (!cm_id) {
2900 nes_debug(NES_DBG_CM, "QP%u disconnect_worker cmid is NULL\n",
2901 nesqp->hwqp.qp_id);
2902 spin_unlock_irqrestore(&nesqp->lock, flags);
2903 return -1;
2904 }
2905
2906 nesvnic = to_nesvnic(nesqp->ibqp.device);
2907 nes_debug(NES_DBG_CM, "Disconnecting QP%u\n", nesqp->hwqp.qp_id);
2908
2909 original_hw_tcp_state = nesqp->hw_tcp_state;
2910 original_ibqp_state = nesqp->ibqp_state;
2911 last_ae = nesqp->last_aeq;
2912
2913 if (nesqp->term_flags) {
2914 issue_disconn = 1;
2915 issue_close = 1;
2916 nesqp->cm_id = NULL;
2917 del_timer(&nesqp->terminate_timer);
2918 if (nesqp->flush_issued == 0) {
2919 nesqp->flush_issued = 1;
2920 issue_flush = 1;
2921 }
2922 } else if ((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSE_WAIT) ||
2923 ((original_ibqp_state == IB_QPS_RTS) &&
2924 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2925 issue_disconn = 1;
2926 if (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET)
2927 disconn_status = -ECONNRESET;
2928 }
2929
2930 if (((original_hw_tcp_state == NES_AEQE_TCP_STATE_CLOSED) ||
2931 (original_hw_tcp_state == NES_AEQE_TCP_STATE_TIME_WAIT) ||
2932 (last_ae == NES_AEQE_AEID_RDMAP_ROE_BAD_LLP_CLOSE) ||
2933 (last_ae == NES_AEQE_AEID_LLP_CONNECTION_RESET))) {
2934 issue_close = 1;
2935 nesqp->cm_id = NULL;
2936 if (nesqp->flush_issued == 0) {
2937 nesqp->flush_issued = 1;
2938 issue_flush = 1;
2939 }
2940 }
2941
2942 spin_unlock_irqrestore(&nesqp->lock, flags);
2943
2944 if ((issue_flush) && (nesqp->destroyed == 0)) {
2945 /* Flush the queue(s) */
2946 if (nesqp->hw_iwarp_state >= NES_AEQE_IWARP_STATE_TERMINATE)
2947 flush_q |= NES_CQP_FLUSH_SQ;
2948 flush_wqes(nesvnic->nesdev, nesqp, flush_q, 1);
2949
2950 if (nesqp->term_flags) {
2951 ibevent.device = nesqp->ibqp.device;
2952 ibevent.event = nesqp->terminate_eventtype;
2953 ibevent.element.qp = &nesqp->ibqp;
2954 if (nesqp->ibqp.event_handler)
2955 nesqp->ibqp.event_handler(&ibevent, nesqp->ibqp.qp_context);
2956 }
2957 }
2958
2959 if ((cm_id) && (cm_id->event_handler)) {
2960 if (issue_disconn) {
2961 atomic_inc(&cm_disconnects);
2962 cm_event.event = IW_CM_EVENT_DISCONNECT;
2963 cm_event.status = disconn_status;
2964 cm_event.local_addr = cm_id->m_local_addr;
2965 cm_event.remote_addr = cm_id->m_remote_addr;
2966 cm_event.private_data = NULL;
2967 cm_event.private_data_len = 0;
2968
2969 nes_debug(NES_DBG_CM, "Generating a CM Disconnect Event"
2970 " for QP%u, SQ Head = %u, SQ Tail = %u. "
2971 "cm_id = %p, refcount = %u.\n",
2972 nesqp->hwqp.qp_id, nesqp->hwqp.sq_head,
2973 nesqp->hwqp.sq_tail, cm_id,
2974 atomic_read(&nesqp->refcount));
2975
2976 ret = cm_id->event_handler(cm_id, &cm_event);
2977 if (ret)
2978 nes_debug(NES_DBG_CM, "OFA CM event_handler "
2979 "returned, ret=%d\n", ret);
2980 }
2981
2982 if (issue_close) {
2983 atomic_inc(&cm_closes);
2984 nes_disconnect(nesqp, 1);
2985
2986 cm_id->provider_data = nesqp;
2987 /* Send up the close complete event */
2988 cm_event.event = IW_CM_EVENT_CLOSE;
2989 cm_event.status = 0;
2990 cm_event.provider_data = cm_id->provider_data;
2991 cm_event.local_addr = cm_id->m_local_addr;
2992 cm_event.remote_addr = cm_id->m_remote_addr;
2993 cm_event.private_data = NULL;
2994 cm_event.private_data_len = 0;
2995
2996 ret = cm_id->event_handler(cm_id, &cm_event);
2997 if (ret)
2998 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
2999
3000 cm_id->rem_ref(cm_id);
3001 }
3002 }
3003
3004 return 0;
3005 }
3006
3007
3008 /**
3009 * nes_disconnect
3010 */
nes_disconnect(struct nes_qp * nesqp,int abrupt)3011 static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
3012 {
3013 int ret = 0;
3014 struct nes_vnic *nesvnic;
3015 struct nes_device *nesdev;
3016 struct nes_ib_device *nesibdev;
3017
3018 nesvnic = to_nesvnic(nesqp->ibqp.device);
3019 if (!nesvnic)
3020 return -EINVAL;
3021
3022 nesdev = nesvnic->nesdev;
3023 nesibdev = nesvnic->nesibdev;
3024
3025 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3026 netdev_refcnt_read(nesvnic->netdev));
3027
3028 if (nesqp->active_conn) {
3029
3030 /* indicate this connection is NOT active */
3031 nesqp->active_conn = 0;
3032 } else {
3033 /* Need to free the Last Streaming Mode Message */
3034 if (nesqp->ietf_frame) {
3035 if (nesqp->lsmm_mr)
3036 nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
3037 pci_free_consistent(nesdev->pcidev,
3038 nesqp->private_data_len + nesqp->ietf_frame_size,
3039 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3040 }
3041 }
3042
3043 /* close the CM node down if it is still active */
3044 if (nesqp->cm_node) {
3045 nes_debug(NES_DBG_CM, "Call close API\n");
3046
3047 g_cm_core->api->close(g_cm_core, nesqp->cm_node);
3048 }
3049
3050 return ret;
3051 }
3052
3053
3054 /**
3055 * nes_accept
3056 */
nes_accept(struct iw_cm_id * cm_id,struct iw_cm_conn_param * conn_param)3057 int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3058 {
3059 u64 u64temp;
3060 struct ib_qp *ibqp;
3061 struct nes_qp *nesqp;
3062 struct nes_vnic *nesvnic;
3063 struct nes_device *nesdev;
3064 struct nes_cm_node *cm_node;
3065 struct nes_adapter *adapter;
3066 struct ib_qp_attr attr;
3067 struct iw_cm_event cm_event;
3068 struct nes_hw_qp_wqe *wqe;
3069 struct nes_v4_quad nes_quad;
3070 u32 crc_value;
3071 int ret;
3072 int passive_state;
3073 struct ib_mr *ibmr = NULL;
3074 struct nes_pd *nespd;
3075 u64 tagged_offset;
3076 u8 mpa_frame_offset = 0;
3077 struct ietf_mpa_v2 *mpa_v2_frame;
3078 u8 start_addr = 0;
3079 u8 *start_ptr = &start_addr;
3080 u8 **start_buff = &start_ptr;
3081 u16 buff_len = 0;
3082 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3083 struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3084
3085 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3086 if (!ibqp)
3087 return -EINVAL;
3088
3089 /* get all our handles */
3090 nesqp = to_nesqp(ibqp);
3091 nesvnic = to_nesvnic(nesqp->ibqp.device);
3092 nesdev = nesvnic->nesdev;
3093 adapter = nesdev->nesadapter;
3094
3095 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3096 nes_debug(NES_DBG_CM, "nes_accept: cm_node= %p nesvnic=%p, netdev=%p,"
3097 "%s\n", cm_node, nesvnic, nesvnic->netdev,
3098 nesvnic->netdev->name);
3099
3100 if (NES_CM_STATE_LISTENER_DESTROYED == cm_node->state) {
3101 if (cm_node->loopbackpartner)
3102 rem_ref_cm_node(cm_node->cm_core, cm_node->loopbackpartner);
3103 rem_ref_cm_node(cm_node->cm_core, cm_node);
3104 return -EINVAL;
3105 }
3106
3107 passive_state = atomic_add_return(1, &cm_node->passive_state);
3108 if (passive_state == NES_SEND_RESET_EVENT) {
3109 rem_ref_cm_node(cm_node->cm_core, cm_node);
3110 return -ECONNRESET;
3111 }
3112 /* associate the node with the QP */
3113 nesqp->cm_node = (void *)cm_node;
3114 cm_node->nesqp = nesqp;
3115
3116
3117 nes_debug(NES_DBG_CM, "QP%u, cm_node=%p, jiffies = %lu listener = %p\n",
3118 nesqp->hwqp.qp_id, cm_node, jiffies, cm_node->listener);
3119 atomic_inc(&cm_accepts);
3120
3121 nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
3122 netdev_refcnt_read(nesvnic->netdev));
3123
3124 nesqp->ietf_frame_size = sizeof(struct ietf_mpa_v2);
3125 /* allocate the ietf frame and space for private data */
3126 nesqp->ietf_frame = pci_alloc_consistent(nesdev->pcidev,
3127 nesqp->ietf_frame_size + conn_param->private_data_len,
3128 &nesqp->ietf_frame_pbase);
3129
3130 if (!nesqp->ietf_frame) {
3131 nes_debug(NES_DBG_CM, "Unable to allocate memory for private data\n");
3132 return -ENOMEM;
3133 }
3134 mpa_v2_frame = (struct ietf_mpa_v2 *)nesqp->ietf_frame;
3135
3136 if (cm_node->mpa_frame_rev == IETF_MPA_V1)
3137 mpa_frame_offset = 4;
3138
3139 if (cm_node->mpa_frame_rev == IETF_MPA_V1 ||
3140 cm_node->mpav2_ird_ord == IETF_NO_IRD_ORD) {
3141 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3142 }
3143
3144 memcpy(mpa_v2_frame->priv_data, conn_param->private_data,
3145 conn_param->private_data_len);
3146
3147 cm_build_mpa_frame(cm_node, start_buff, &buff_len, nesqp->ietf_frame, MPA_KEY_REPLY);
3148 nesqp->private_data_len = conn_param->private_data_len;
3149
3150 /* setup our first outgoing iWarp send WQE (the IETF frame response) */
3151 wqe = &nesqp->hwqp.sq_vbase[0];
3152
3153 if (raddr->sin_addr.s_addr != laddr->sin_addr.s_addr) {
3154 u64temp = (unsigned long)nesqp;
3155 nespd = nesqp->nespd;
3156 tagged_offset = (u64)(unsigned long)*start_buff;
3157 ibmr = nes_reg_phys_mr(&nespd->ibpd,
3158 nesqp->ietf_frame_pbase + mpa_frame_offset,
3159 buff_len, IB_ACCESS_LOCAL_WRITE,
3160 &tagged_offset);
3161 if (IS_ERR(ibmr)) {
3162 nes_debug(NES_DBG_CM, "Unable to register memory region"
3163 "for lSMM for cm_node = %p \n",
3164 cm_node);
3165 pci_free_consistent(nesdev->pcidev,
3166 nesqp->private_data_len + nesqp->ietf_frame_size,
3167 nesqp->ietf_frame, nesqp->ietf_frame_pbase);
3168 return PTR_ERR(ibmr);
3169 }
3170
3171 ibmr->pd = &nespd->ibpd;
3172 ibmr->device = nespd->ibpd.device;
3173 nesqp->lsmm_mr = ibmr;
3174
3175 u64temp |= NES_SW_CONTEXT_ALIGN >> 1;
3176 set_wqe_64bit_value(wqe->wqe_words,
3177 NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
3178 u64temp);
3179 wqe->wqe_words[NES_IWARP_SQ_WQE_MISC_IDX] =
3180 cpu_to_le32(NES_IWARP_SQ_WQE_STREAMING |
3181 NES_IWARP_SQ_WQE_WRPDU);
3182 wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
3183 cpu_to_le32(buff_len);
3184 set_wqe_64bit_value(wqe->wqe_words,
3185 NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
3186 (u64)(unsigned long)(*start_buff));
3187 wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
3188 cpu_to_le32(buff_len);
3189 wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
3190 if (nesqp->sq_kmapped) {
3191 nesqp->sq_kmapped = 0;
3192 kunmap(nesqp->page);
3193 }
3194
3195 nesqp->nesqp_context->ird_ord_sizes |=
3196 cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |
3197 NES_QPCONTEXT_ORDIRD_WRPDU);
3198 } else {
3199 nesqp->nesqp_context->ird_ord_sizes |=
3200 cpu_to_le32(NES_QPCONTEXT_ORDIRD_WRPDU);
3201 }
3202 nesqp->skip_lsmm = 1;
3203
3204 /* Cache the cm_id in the qp */
3205 nesqp->cm_id = cm_id;
3206 cm_node->cm_id = cm_id;
3207
3208 /* nesqp->cm_node = (void *)cm_id->provider_data; */
3209 cm_id->provider_data = nesqp;
3210 nesqp->active_conn = 0;
3211
3212 if (cm_node->state == NES_CM_STATE_TSA)
3213 nes_debug(NES_DBG_CM, "Already state = TSA for cm_node=%p\n",
3214 cm_node);
3215
3216 nes_cm_init_tsa_conn(nesqp, cm_node);
3217
3218 nesqp->nesqp_context->tcpPorts[0] =
3219 cpu_to_le16(cm_node->loc_port);
3220 nesqp->nesqp_context->tcpPorts[1] =
3221 cpu_to_le16(cm_node->rem_port);
3222
3223 nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->rem_addr);
3224
3225 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3226 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3227 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3228
3229 nesqp->nesqp_context->arp_index_vlan |=
3230 cpu_to_le32(nes_arp_table(nesdev,
3231 le32_to_cpu(nesqp->nesqp_context->ip0), NULL,
3232 NES_ARP_RESOLVE) << 16);
3233
3234 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3235 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3236
3237 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3238
3239 nesqp->nesqp_context->ird_ord_sizes |= cpu_to_le32(
3240 ((u32)1 << NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT));
3241 nesqp->nesqp_context->ird_ord_sizes |=
3242 cpu_to_le32((u32)cm_node->ord_size);
3243
3244 memset(&nes_quad, 0, sizeof(nes_quad));
3245 nes_quad.DstIpAdrIndex =
3246 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3247 nes_quad.SrcIpadr = htonl(cm_node->rem_addr);
3248 nes_quad.TcpPorts[0] = htons(cm_node->rem_port);
3249 nes_quad.TcpPorts[1] = htons(cm_node->loc_port);
3250
3251 /* Produce hash key */
3252 crc_value = get_crc_value(&nes_quad);
3253 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3254 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
3255 nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
3256
3257 nesqp->hte_index &= adapter->hte_index_mask;
3258 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3259
3260 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3261
3262 nes_debug(NES_DBG_CM, "QP%u, Destination IP = 0x%08X:0x%04X, local = "
3263 "0x%08X:0x%04X, rcv_nxt=0x%08X, snd_nxt=0x%08X, mpa + "
3264 "private data length=%u.\n", nesqp->hwqp.qp_id,
3265 ntohl(raddr->sin_addr.s_addr), ntohs(raddr->sin_port),
3266 ntohl(laddr->sin_addr.s_addr), ntohs(laddr->sin_port),
3267 le32_to_cpu(nesqp->nesqp_context->rcv_nxt),
3268 le32_to_cpu(nesqp->nesqp_context->snd_nxt),
3269 buff_len);
3270
3271 /* notify OF layer that accept event was successful */
3272 cm_id->add_ref(cm_id);
3273 nes_add_ref(&nesqp->ibqp);
3274
3275 cm_event.event = IW_CM_EVENT_ESTABLISHED;
3276 cm_event.status = 0;
3277 cm_event.provider_data = (void *)nesqp;
3278 cm_event.local_addr = cm_id->m_local_addr;
3279 cm_event.remote_addr = cm_id->m_remote_addr;
3280 cm_event.private_data = NULL;
3281 cm_event.private_data_len = 0;
3282 cm_event.ird = cm_node->ird_size;
3283 cm_event.ord = cm_node->ord_size;
3284
3285 ret = cm_id->event_handler(cm_id, &cm_event);
3286 attr.qp_state = IB_QPS_RTS;
3287 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3288 if (cm_node->loopbackpartner) {
3289 cm_node->loopbackpartner->mpa_frame_size =
3290 nesqp->private_data_len;
3291 /* copy entire MPA frame to our cm_node's frame */
3292 memcpy(cm_node->loopbackpartner->mpa_frame_buf,
3293 conn_param->private_data, conn_param->private_data_len);
3294 create_event(cm_node->loopbackpartner, NES_CM_EVENT_CONNECTED);
3295 }
3296 if (ret)
3297 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3298 "ret=%d\n", __func__, __LINE__, ret);
3299
3300 return 0;
3301 }
3302
3303
3304 /**
3305 * nes_reject
3306 */
nes_reject(struct iw_cm_id * cm_id,const void * pdata,u8 pdata_len)3307 int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
3308 {
3309 struct nes_cm_node *cm_node;
3310 struct nes_cm_node *loopback;
3311 struct nes_cm_core *cm_core;
3312 u8 *start_buff;
3313
3314 atomic_inc(&cm_rejects);
3315 cm_node = (struct nes_cm_node *)cm_id->provider_data;
3316 loopback = cm_node->loopbackpartner;
3317 cm_core = cm_node->cm_core;
3318 cm_node->cm_id = cm_id;
3319
3320 if (pdata_len + sizeof(struct ietf_mpa_v2) > MAX_CM_BUFFER)
3321 return -EINVAL;
3322
3323 if (loopback) {
3324 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
3325 loopback->mpa_frame.priv_data_len = pdata_len;
3326 loopback->mpa_frame_size = pdata_len;
3327 } else {
3328 start_buff = &cm_node->mpa_frame_buf[0] + sizeof(struct ietf_mpa_v2);
3329 cm_node->mpa_frame_size = pdata_len;
3330 memcpy(start_buff, pdata, pdata_len);
3331 }
3332 return cm_core->api->reject(cm_core, cm_node);
3333 }
3334
3335
3336 /**
3337 * nes_connect
3338 * setup and launch cm connect node
3339 */
nes_connect(struct iw_cm_id * cm_id,struct iw_cm_conn_param * conn_param)3340 int nes_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
3341 {
3342 struct ib_qp *ibqp;
3343 struct nes_qp *nesqp;
3344 struct nes_vnic *nesvnic;
3345 struct nes_device *nesdev;
3346 struct nes_cm_node *cm_node;
3347 struct nes_cm_info cm_info;
3348 int apbvt_set = 0;
3349 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3350 struct sockaddr_in *raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3351
3352 if (cm_id->remote_addr.ss_family != AF_INET)
3353 return -ENOSYS;
3354 ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
3355 if (!ibqp)
3356 return -EINVAL;
3357 nesqp = to_nesqp(ibqp);
3358 if (!nesqp)
3359 return -EINVAL;
3360 nesvnic = to_nesvnic(nesqp->ibqp.device);
3361 if (!nesvnic)
3362 return -EINVAL;
3363 nesdev = nesvnic->nesdev;
3364 if (!nesdev)
3365 return -EINVAL;
3366
3367 if (!laddr->sin_port || !raddr->sin_port)
3368 return -EINVAL;
3369
3370 nes_debug(NES_DBG_CM, "QP%u, current IP = 0x%08X, Destination IP = "
3371 "0x%08X:0x%04X, local = 0x%08X:0x%04X.\n", nesqp->hwqp.qp_id,
3372 ntohl(nesvnic->local_ipaddr), ntohl(raddr->sin_addr.s_addr),
3373 ntohs(raddr->sin_port), ntohl(laddr->sin_addr.s_addr),
3374 ntohs(laddr->sin_port));
3375
3376 atomic_inc(&cm_connects);
3377 nesqp->active_conn = 1;
3378
3379 /* cache the cm_id in the qp */
3380 nesqp->cm_id = cm_id;
3381 cm_id->provider_data = nesqp;
3382 nesqp->private_data_len = conn_param->private_data_len;
3383
3384 nes_debug(NES_DBG_CM, "requested ord = 0x%08X.\n", (u32)conn_param->ord);
3385 nes_debug(NES_DBG_CM, "mpa private data len =%u\n",
3386 conn_param->private_data_len);
3387
3388 /* set up the connection params for the node */
3389 cm_info.loc_addr = ntohl(laddr->sin_addr.s_addr);
3390 cm_info.loc_port = ntohs(laddr->sin_port);
3391 cm_info.rem_addr = ntohl(raddr->sin_addr.s_addr);
3392 cm_info.rem_port = ntohs(raddr->sin_port);
3393 cm_info.cm_id = cm_id;
3394 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3395
3396 if (laddr->sin_addr.s_addr != raddr->sin_addr.s_addr) {
3397 nes_manage_apbvt(nesvnic, cm_info.loc_port,
3398 PCI_FUNC(nesdev->pcidev->devfn),
3399 NES_MANAGE_APBVT_ADD);
3400 apbvt_set = 1;
3401 }
3402
3403 cm_id->add_ref(cm_id);
3404
3405 /* create a connect CM node connection */
3406 cm_node = g_cm_core->api->connect(g_cm_core, nesvnic,
3407 conn_param->private_data_len, (void *)conn_param->private_data,
3408 &cm_info);
3409 if (!cm_node) {
3410 if (apbvt_set)
3411 nes_manage_apbvt(nesvnic, cm_info.loc_port,
3412 PCI_FUNC(nesdev->pcidev->devfn),
3413 NES_MANAGE_APBVT_DEL);
3414
3415 nes_debug(NES_DBG_NLMSG, "Delete loc_port = %04X\n",
3416 cm_info.loc_port);
3417 cm_id->rem_ref(cm_id);
3418 return -ENOMEM;
3419 }
3420
3421 record_ird_ord(cm_node, (u16)conn_param->ird, (u16)conn_param->ord);
3422 if (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO &&
3423 cm_node->ord_size == 0)
3424 cm_node->ord_size = 1;
3425
3426 cm_node->apbvt_set = apbvt_set;
3427 cm_node->tos = cm_id->tos;
3428 nesqp->cm_node = cm_node;
3429 cm_node->nesqp = nesqp;
3430 nes_add_ref(&nesqp->ibqp);
3431
3432 return 0;
3433 }
3434
3435
3436 /**
3437 * nes_create_listen
3438 */
nes_create_listen(struct iw_cm_id * cm_id,int backlog)3439 int nes_create_listen(struct iw_cm_id *cm_id, int backlog)
3440 {
3441 struct nes_vnic *nesvnic;
3442 struct nes_cm_listener *cm_node;
3443 struct nes_cm_info cm_info;
3444 int err;
3445 struct sockaddr_in *laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3446
3447 nes_debug(NES_DBG_CM, "cm_id = %p, local port = 0x%04X.\n",
3448 cm_id, ntohs(laddr->sin_port));
3449
3450 if (cm_id->m_local_addr.ss_family != AF_INET)
3451 return -ENOSYS;
3452 nesvnic = to_nesvnic(cm_id->device);
3453 if (!nesvnic)
3454 return -EINVAL;
3455
3456 nes_debug(NES_DBG_CM, "nesvnic=%p, netdev=%p, %s\n",
3457 nesvnic, nesvnic->netdev, nesvnic->netdev->name);
3458
3459 nes_debug(NES_DBG_CM, "nesvnic->local_ipaddr=0x%08x, sin_addr.s_addr=0x%08x\n",
3460 nesvnic->local_ipaddr, laddr->sin_addr.s_addr);
3461
3462 /* setup listen params in our api call struct */
3463 cm_info.loc_addr = ntohl(nesvnic->local_ipaddr);
3464 cm_info.loc_port = ntohs(laddr->sin_port);
3465 cm_info.backlog = backlog;
3466 cm_info.cm_id = cm_id;
3467
3468 cm_info.conn_type = NES_CM_IWARP_CONN_TYPE;
3469
3470 cm_node = g_cm_core->api->listen(g_cm_core, nesvnic, &cm_info);
3471 if (!cm_node) {
3472 printk(KERN_ERR "%s[%u] Error returned from listen API call\n",
3473 __func__, __LINE__);
3474 return -ENOMEM;
3475 }
3476
3477 cm_id->provider_data = cm_node;
3478 cm_node->tos = cm_id->tos;
3479
3480 if (!cm_node->reused_node) {
3481 err = nes_manage_apbvt(nesvnic, cm_node->loc_port,
3482 PCI_FUNC(nesvnic->nesdev->pcidev->devfn),
3483 NES_MANAGE_APBVT_ADD);
3484 if (err) {
3485 printk(KERN_ERR "nes_manage_apbvt call returned %d.\n",
3486 err);
3487 g_cm_core->api->stop_listener(g_cm_core, (void *)cm_node);
3488 return err;
3489 }
3490 atomic_inc(&cm_listens_created);
3491 }
3492
3493 cm_id->add_ref(cm_id);
3494 cm_id->provider_data = (void *)cm_node;
3495
3496
3497 return 0;
3498 }
3499
3500
3501 /**
3502 * nes_destroy_listen
3503 */
nes_destroy_listen(struct iw_cm_id * cm_id)3504 int nes_destroy_listen(struct iw_cm_id *cm_id)
3505 {
3506 if (cm_id->provider_data)
3507 g_cm_core->api->stop_listener(g_cm_core, cm_id->provider_data);
3508 else
3509 nes_debug(NES_DBG_CM, "cm_id->provider_data was NULL\n");
3510
3511 cm_id->rem_ref(cm_id);
3512
3513 return 0;
3514 }
3515
3516
3517 /**
3518 * nes_cm_recv
3519 */
nes_cm_recv(struct sk_buff * skb,struct net_device * netdevice)3520 int nes_cm_recv(struct sk_buff *skb, struct net_device *netdevice)
3521 {
3522 int rc = 0;
3523
3524 cm_packets_received++;
3525 if ((g_cm_core) && (g_cm_core->api))
3526 rc = g_cm_core->api->recv_pkt(g_cm_core, netdev_priv(netdevice), skb);
3527 else
3528 nes_debug(NES_DBG_CM, "Unable to process packet for CM,"
3529 " cm is not setup properly.\n");
3530
3531 return rc;
3532 }
3533
3534
3535 /**
3536 * nes_cm_start
3537 * Start and init a cm core module
3538 */
nes_cm_start(void)3539 int nes_cm_start(void)
3540 {
3541 nes_debug(NES_DBG_CM, "\n");
3542 /* create the primary CM core, pass this handle to subsequent core inits */
3543 g_cm_core = nes_cm_alloc_core();
3544 if (g_cm_core)
3545 return 0;
3546 else
3547 return -ENOMEM;
3548 }
3549
3550
3551 /**
3552 * nes_cm_stop
3553 * stop and dealloc all cm core instances
3554 */
nes_cm_stop(void)3555 int nes_cm_stop(void)
3556 {
3557 g_cm_core->api->destroy_cm_core(g_cm_core);
3558 return 0;
3559 }
3560
3561
3562 /**
3563 * cm_event_connected
3564 * handle a connected event, setup QPs and HW
3565 */
cm_event_connected(struct nes_cm_event * event)3566 static void cm_event_connected(struct nes_cm_event *event)
3567 {
3568 struct nes_qp *nesqp;
3569 struct nes_vnic *nesvnic;
3570 struct nes_device *nesdev;
3571 struct nes_cm_node *cm_node;
3572 struct nes_adapter *nesadapter;
3573 struct ib_qp_attr attr;
3574 struct iw_cm_id *cm_id;
3575 struct iw_cm_event cm_event;
3576 struct nes_v4_quad nes_quad;
3577 u32 crc_value;
3578 int ret;
3579 struct sockaddr_in *laddr;
3580 struct sockaddr_in *raddr;
3581 struct sockaddr_in *cm_event_laddr;
3582
3583 /* get all our handles */
3584 cm_node = event->cm_node;
3585 cm_id = cm_node->cm_id;
3586 nes_debug(NES_DBG_CM, "cm_event_connected - %p - cm_id = %p\n", cm_node, cm_id);
3587 nesqp = (struct nes_qp *)cm_id->provider_data;
3588 nesvnic = to_nesvnic(nesqp->ibqp.device);
3589 nesdev = nesvnic->nesdev;
3590 nesadapter = nesdev->nesadapter;
3591 laddr = (struct sockaddr_in *)&cm_id->m_local_addr;
3592 raddr = (struct sockaddr_in *)&cm_id->m_remote_addr;
3593 cm_event_laddr = (struct sockaddr_in *)&cm_event.local_addr;
3594
3595 if (nesqp->destroyed)
3596 return;
3597 atomic_inc(&cm_connecteds);
3598 nes_debug(NES_DBG_CM, "QP%u attempting to connect to 0x%08X:0x%04X on"
3599 " local port 0x%04X. jiffies = %lu.\n",
3600 nesqp->hwqp.qp_id, ntohl(raddr->sin_addr.s_addr),
3601 ntohs(raddr->sin_port), ntohs(laddr->sin_port), jiffies);
3602
3603 nes_cm_init_tsa_conn(nesqp, cm_node);
3604
3605 /* set the QP tsa context */
3606 nesqp->nesqp_context->tcpPorts[0] =
3607 cpu_to_le16(cm_node->loc_port);
3608 nesqp->nesqp_context->tcpPorts[1] =
3609 cpu_to_le16(cm_node->rem_port);
3610 nesqp->nesqp_context->ip0 = cpu_to_le32(cm_node->rem_addr);
3611
3612 nesqp->nesqp_context->misc2 |= cpu_to_le32(
3613 (u32)PCI_FUNC(nesdev->pcidev->devfn) <<
3614 NES_QPCONTEXT_MISC2_SRC_IP_SHIFT);
3615 nesqp->nesqp_context->arp_index_vlan |= cpu_to_le32(
3616 nes_arp_table(nesdev,
3617 le32_to_cpu(nesqp->nesqp_context->ip0),
3618 NULL, NES_ARP_RESOLVE) << 16);
3619 nesqp->nesqp_context->ts_val_delta = cpu_to_le32(
3620 jiffies - nes_read_indexed(nesdev, NES_IDX_TCP_NOW));
3621 nesqp->nesqp_context->ird_index = cpu_to_le32(nesqp->hwqp.qp_id);
3622 nesqp->nesqp_context->ird_ord_sizes |=
3623 cpu_to_le32((u32)1 <<
3624 NES_QPCONTEXT_ORDIRD_IWARP_MODE_SHIFT);
3625 nesqp->nesqp_context->ird_ord_sizes |=
3626 cpu_to_le32((u32)cm_node->ord_size);
3627
3628 /* Adjust tail for not having a LSMM */
3629 /*nesqp->hwqp.sq_tail = 1;*/
3630
3631 build_rdma0_msg(cm_node, &nesqp);
3632
3633 nes_write32(nesdev->regs + NES_WQE_ALLOC,
3634 (1 << 24) | 0x00800000 | nesqp->hwqp.qp_id);
3635
3636 memset(&nes_quad, 0, sizeof(nes_quad));
3637
3638 nes_quad.DstIpAdrIndex =
3639 cpu_to_le32((u32)PCI_FUNC(nesdev->pcidev->devfn) << 24);
3640 nes_quad.SrcIpadr = htonl(cm_node->rem_addr);
3641 nes_quad.TcpPorts[0] = htons(cm_node->rem_port);
3642 nes_quad.TcpPorts[1] = htons(cm_node->loc_port);
3643
3644 /* Produce hash key */
3645 crc_value = get_crc_value(&nes_quad);
3646 nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
3647 nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
3648 nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);
3649
3650 nesqp->hte_index &= nesadapter->hte_index_mask;
3651 nesqp->nesqp_context->hte_index = cpu_to_le32(nesqp->hte_index);
3652
3653 nesqp->ietf_frame = &cm_node->mpa_frame;
3654 nesqp->private_data_len = (u8)cm_node->mpa_frame_size;
3655 cm_node->cm_core->api->accelerated(cm_node->cm_core, cm_node);
3656
3657 /* notify OF layer we successfully created the requested connection */
3658 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3659 cm_event.status = 0;
3660 cm_event.provider_data = cm_id->provider_data;
3661 cm_event_laddr->sin_family = AF_INET;
3662 cm_event_laddr->sin_port = laddr->sin_port;
3663 cm_event.remote_addr = cm_id->m_remote_addr;
3664
3665 cm_event.private_data = (void *)event->cm_node->mpa_frame_buf;
3666 cm_event.private_data_len = (u8)event->cm_node->mpa_frame_size;
3667 cm_event.ird = cm_node->ird_size;
3668 cm_event.ord = cm_node->ord_size;
3669
3670 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3671 ret = cm_id->event_handler(cm_id, &cm_event);
3672 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3673
3674 if (ret)
3675 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3676 "ret=%d\n", __func__, __LINE__, ret);
3677 attr.qp_state = IB_QPS_RTS;
3678 nes_modify_qp(&nesqp->ibqp, &attr, IB_QP_STATE, NULL);
3679
3680 nes_debug(NES_DBG_CM, "Exiting connect thread for QP%u. jiffies = "
3681 "%lu\n", nesqp->hwqp.qp_id, jiffies);
3682
3683 return;
3684 }
3685
3686
3687 /**
3688 * cm_event_connect_error
3689 */
cm_event_connect_error(struct nes_cm_event * event)3690 static void cm_event_connect_error(struct nes_cm_event *event)
3691 {
3692 struct nes_qp *nesqp;
3693 struct iw_cm_id *cm_id;
3694 struct iw_cm_event cm_event;
3695 /* struct nes_cm_info cm_info; */
3696 int ret;
3697
3698 if (!event->cm_node)
3699 return;
3700
3701 cm_id = event->cm_node->cm_id;
3702 if (!cm_id)
3703 return;
3704
3705 nes_debug(NES_DBG_CM, "cm_node=%p, cm_id=%p\n", event->cm_node, cm_id);
3706 nesqp = cm_id->provider_data;
3707
3708 if (!nesqp)
3709 return;
3710
3711 /* notify OF layer about this connection error event */
3712 /* cm_id->rem_ref(cm_id); */
3713 nesqp->cm_id = NULL;
3714 cm_id->provider_data = NULL;
3715 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3716 cm_event.status = -ECONNRESET;
3717 cm_event.provider_data = cm_id->provider_data;
3718 cm_event.local_addr = cm_id->m_local_addr;
3719 cm_event.remote_addr = cm_id->m_remote_addr;
3720 cm_event.private_data = NULL;
3721 cm_event.private_data_len = 0;
3722
3723 #ifdef CONFIG_INFINIBAND_NES_DEBUG
3724 {
3725 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3726 &cm_event.local_addr;
3727 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3728 &cm_event.remote_addr;
3729 nes_debug(NES_DBG_CM, "call CM_EVENT REJECTED, local_addr=%08x, remote_addr=%08x\n",
3730 cm_event_laddr->sin_addr.s_addr, cm_event_raddr->sin_addr.s_addr);
3731 }
3732 #endif
3733
3734 ret = cm_id->event_handler(cm_id, &cm_event);
3735 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3736 if (ret)
3737 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, "
3738 "ret=%d\n", __func__, __LINE__, ret);
3739 cm_id->rem_ref(cm_id);
3740
3741 rem_ref_cm_node(event->cm_node->cm_core, event->cm_node);
3742 return;
3743 }
3744
3745
3746 /**
3747 * cm_event_reset
3748 */
cm_event_reset(struct nes_cm_event * event)3749 static void cm_event_reset(struct nes_cm_event *event)
3750 {
3751 struct nes_qp *nesqp;
3752 struct iw_cm_id *cm_id;
3753 struct iw_cm_event cm_event;
3754 /* struct nes_cm_info cm_info; */
3755 int ret;
3756
3757 if (!event->cm_node)
3758 return;
3759
3760 if (!event->cm_node->cm_id)
3761 return;
3762
3763 cm_id = event->cm_node->cm_id;
3764
3765 nes_debug(NES_DBG_CM, "%p - cm_id = %p\n", event->cm_node, cm_id);
3766 nesqp = cm_id->provider_data;
3767 if (!nesqp)
3768 return;
3769
3770 nesqp->cm_id = NULL;
3771 /* cm_id->provider_data = NULL; */
3772 cm_event.event = IW_CM_EVENT_DISCONNECT;
3773 cm_event.status = -ECONNRESET;
3774 cm_event.provider_data = cm_id->provider_data;
3775 cm_event.local_addr = cm_id->m_local_addr;
3776 cm_event.remote_addr = cm_id->m_remote_addr;
3777 cm_event.private_data = NULL;
3778 cm_event.private_data_len = 0;
3779
3780 cm_id->add_ref(cm_id);
3781 ret = cm_id->event_handler(cm_id, &cm_event);
3782 atomic_inc(&cm_closes);
3783 cm_event.event = IW_CM_EVENT_CLOSE;
3784 cm_event.status = 0;
3785 cm_event.provider_data = cm_id->provider_data;
3786 cm_event.local_addr = cm_id->m_local_addr;
3787 cm_event.remote_addr = cm_id->m_remote_addr;
3788 cm_event.private_data = NULL;
3789 cm_event.private_data_len = 0;
3790 nes_debug(NES_DBG_CM, "NODE %p Generating CLOSE\n", event->cm_node);
3791 ret = cm_id->event_handler(cm_id, &cm_event);
3792
3793 nes_debug(NES_DBG_CM, "OFA CM event_handler returned, ret=%d\n", ret);
3794
3795
3796 /* notify OF layer about this connection error event */
3797 cm_id->rem_ref(cm_id);
3798
3799 return;
3800 }
3801
3802
3803 /**
3804 * cm_event_mpa_req
3805 */
cm_event_mpa_req(struct nes_cm_event * event)3806 static void cm_event_mpa_req(struct nes_cm_event *event)
3807 {
3808 struct iw_cm_id *cm_id;
3809 struct iw_cm_event cm_event;
3810 int ret;
3811 struct nes_cm_node *cm_node;
3812 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3813 &cm_event.local_addr;
3814 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3815 &cm_event.remote_addr;
3816
3817 cm_node = event->cm_node;
3818 if (!cm_node)
3819 return;
3820 cm_id = cm_node->cm_id;
3821
3822 atomic_inc(&cm_connect_reqs);
3823 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3824 cm_node, cm_id, jiffies);
3825
3826 cm_event.event = IW_CM_EVENT_CONNECT_REQUEST;
3827 cm_event.status = 0;
3828 cm_event.provider_data = (void *)cm_node;
3829
3830 cm_event_laddr->sin_family = AF_INET;
3831 cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3832 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3833
3834 cm_event_raddr->sin_family = AF_INET;
3835 cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3836 cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3837 cm_event.private_data = cm_node->mpa_frame_buf;
3838 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3839 if (cm_node->mpa_frame_rev == IETF_MPA_V1) {
3840 cm_event.ird = NES_MAX_IRD;
3841 cm_event.ord = NES_MAX_ORD;
3842 } else {
3843 cm_event.ird = cm_node->ird_size;
3844 cm_event.ord = cm_node->ord_size;
3845 }
3846
3847 ret = cm_id->event_handler(cm_id, &cm_event);
3848 if (ret)
3849 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3850 __func__, __LINE__, ret);
3851 return;
3852 }
3853
3854
cm_event_mpa_reject(struct nes_cm_event * event)3855 static void cm_event_mpa_reject(struct nes_cm_event *event)
3856 {
3857 struct iw_cm_id *cm_id;
3858 struct iw_cm_event cm_event;
3859 struct nes_cm_node *cm_node;
3860 int ret;
3861 struct sockaddr_in *cm_event_laddr = (struct sockaddr_in *)
3862 &cm_event.local_addr;
3863 struct sockaddr_in *cm_event_raddr = (struct sockaddr_in *)
3864 &cm_event.remote_addr;
3865
3866 cm_node = event->cm_node;
3867 if (!cm_node)
3868 return;
3869 cm_id = cm_node->cm_id;
3870
3871 atomic_inc(&cm_connect_reqs);
3872 nes_debug(NES_DBG_CM, "cm_node = %p - cm_id = %p, jiffies = %lu\n",
3873 cm_node, cm_id, jiffies);
3874
3875 cm_event.event = IW_CM_EVENT_CONNECT_REPLY;
3876 cm_event.status = -ECONNREFUSED;
3877 cm_event.provider_data = cm_id->provider_data;
3878
3879 cm_event_laddr->sin_family = AF_INET;
3880 cm_event_laddr->sin_port = htons(event->cm_info.loc_port);
3881 cm_event_laddr->sin_addr.s_addr = htonl(event->cm_info.loc_addr);
3882
3883 cm_event_raddr->sin_family = AF_INET;
3884 cm_event_raddr->sin_port = htons(event->cm_info.rem_port);
3885 cm_event_raddr->sin_addr.s_addr = htonl(event->cm_info.rem_addr);
3886
3887 cm_event.private_data = cm_node->mpa_frame_buf;
3888 cm_event.private_data_len = (u8)cm_node->mpa_frame_size;
3889
3890 nes_debug(NES_DBG_CM, "call CM_EVENT_MPA_REJECTED, local_addr=%08x, "
3891 "remove_addr=%08x\n",
3892 cm_event_laddr->sin_addr.s_addr,
3893 cm_event_raddr->sin_addr.s_addr);
3894
3895 ret = cm_id->event_handler(cm_id, &cm_event);
3896 if (ret)
3897 printk(KERN_ERR "%s[%u] OFA CM event_handler returned, ret=%d\n",
3898 __func__, __LINE__, ret);
3899
3900 return;
3901 }
3902
3903
3904 static void nes_cm_event_handler(struct work_struct *);
3905
3906 /**
3907 * nes_cm_post_event
3908 * post an event to the cm event handler
3909 */
nes_cm_post_event(struct nes_cm_event * event)3910 static int nes_cm_post_event(struct nes_cm_event *event)
3911 {
3912 atomic_inc(&event->cm_node->cm_core->events_posted);
3913 add_ref_cm_node(event->cm_node);
3914 event->cm_info.cm_id->add_ref(event->cm_info.cm_id);
3915 INIT_WORK(&event->event_work, nes_cm_event_handler);
3916 nes_debug(NES_DBG_CM, "cm_node=%p queue_work, event=%p\n",
3917 event->cm_node, event);
3918
3919 queue_work(event->cm_node->cm_core->event_wq, &event->event_work);
3920
3921 nes_debug(NES_DBG_CM, "Exit\n");
3922 return 0;
3923 }
3924
3925
3926 /**
3927 * nes_cm_event_handler
3928 * worker function to handle cm events
3929 * will free instance of nes_cm_event
3930 */
nes_cm_event_handler(struct work_struct * work)3931 static void nes_cm_event_handler(struct work_struct *work)
3932 {
3933 struct nes_cm_event *event = container_of(work, struct nes_cm_event,
3934 event_work);
3935 struct nes_cm_core *cm_core;
3936
3937 if ((!event) || (!event->cm_node) || (!event->cm_node->cm_core))
3938 return;
3939
3940 cm_core = event->cm_node->cm_core;
3941 nes_debug(NES_DBG_CM, "event=%p, event->type=%u, events posted=%u\n",
3942 event, event->type, atomic_read(&cm_core->events_posted));
3943
3944 switch (event->type) {
3945 case NES_CM_EVENT_MPA_REQ:
3946 cm_event_mpa_req(event);
3947 nes_debug(NES_DBG_CM, "cm_node=%p CM Event: MPA REQUEST\n",
3948 event->cm_node);
3949 break;
3950 case NES_CM_EVENT_RESET:
3951 nes_debug(NES_DBG_CM, "cm_node = %p CM Event: RESET\n",
3952 event->cm_node);
3953 cm_event_reset(event);
3954 break;
3955 case NES_CM_EVENT_CONNECTED:
3956 if ((!event->cm_node->cm_id) ||
3957 (event->cm_node->state != NES_CM_STATE_TSA))
3958 break;
3959 cm_event_connected(event);
3960 nes_debug(NES_DBG_CM, "CM Event: CONNECTED\n");
3961 break;
3962 case NES_CM_EVENT_MPA_REJECT:
3963 if ((!event->cm_node->cm_id) ||
3964 (event->cm_node->state == NES_CM_STATE_TSA))
3965 break;
3966 cm_event_mpa_reject(event);
3967 nes_debug(NES_DBG_CM, "CM Event: REJECT\n");
3968 break;
3969
3970 case NES_CM_EVENT_ABORTED:
3971 if ((!event->cm_node->cm_id) ||
3972 (event->cm_node->state == NES_CM_STATE_TSA))
3973 break;
3974 cm_event_connect_error(event);
3975 nes_debug(NES_DBG_CM, "CM Event: ABORTED\n");
3976 break;
3977 case NES_CM_EVENT_DROPPED_PKT:
3978 nes_debug(NES_DBG_CM, "CM Event: DROPPED PKT\n");
3979 break;
3980 default:
3981 nes_debug(NES_DBG_CM, "CM Event: UNKNOWN EVENT TYPE\n");
3982 break;
3983 }
3984
3985 atomic_dec(&cm_core->events_posted);
3986 event->cm_info.cm_id->rem_ref(event->cm_info.cm_id);
3987 rem_ref_cm_node(cm_core, event->cm_node);
3988 kfree(event);
3989
3990 return;
3991 }
3992
