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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * CLC (connection layer control) handshake over initial TCP socket to
6 * prepare for RDMA traffic
7 *
8 * Copyright IBM Corp. 2016, 2018
9 *
10 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
11 */
12
13#include <linux/in.h>
14#include <linux/inetdevice.h>
15#include <linux/if_ether.h>
16#include <linux/sched/signal.h>
17
18#include <net/addrconf.h>
19#include <net/sock.h>
20#include <net/tcp.h>
21
22#include "smc.h"
23#include "smc_core.h"
24#include "smc_clc.h"
25#include "smc_ib.h"
26#include "smc_ism.h"
27
28#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
29#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
30
31/* eye catcher "SMCR" EBCDIC for CLC messages */
32static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
33/* eye catcher "SMCD" EBCDIC for CLC messages */
34static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
35
36/* check if received message has a correct header length and contains valid
37 * heading and trailing eyecatchers
38 */
39static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm)
40{
41 struct smc_clc_msg_proposal_prefix *pclc_prfx;
42 struct smc_clc_msg_accept_confirm *clc;
43 struct smc_clc_msg_proposal *pclc;
44 struct smc_clc_msg_decline *dclc;
45 struct smc_clc_msg_trail *trl;
46
47 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
48 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
49 return false;
50 switch (clcm->type) {
51 case SMC_CLC_PROPOSAL:
52 if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D &&
53 clcm->path != SMC_TYPE_B)
54 return false;
55 pclc = (struct smc_clc_msg_proposal *)clcm;
56 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
57 if (ntohs(pclc->hdr.length) !=
58 sizeof(*pclc) + ntohs(pclc->iparea_offset) +
59 sizeof(*pclc_prfx) +
60 pclc_prfx->ipv6_prefixes_cnt *
61 sizeof(struct smc_clc_ipv6_prefix) +
62 sizeof(*trl))
63 return false;
64 trl = (struct smc_clc_msg_trail *)
65 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
66 break;
67 case SMC_CLC_ACCEPT:
68 case SMC_CLC_CONFIRM:
69 if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D)
70 return false;
71 clc = (struct smc_clc_msg_accept_confirm *)clcm;
72 if ((clcm->path == SMC_TYPE_R &&
73 ntohs(clc->hdr.length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
74 (clcm->path == SMC_TYPE_D &&
75 ntohs(clc->hdr.length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
76 return false;
77 trl = (struct smc_clc_msg_trail *)
78 ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl));
79 break;
80 case SMC_CLC_DECLINE:
81 dclc = (struct smc_clc_msg_decline *)clcm;
82 if (ntohs(dclc->hdr.length) != sizeof(*dclc))
83 return false;
84 trl = &dclc->trl;
85 break;
86 default:
87 return false;
88 }
89 if (memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
90 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
91 return false;
92 return true;
93}
94
95/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
96static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
97 struct smc_clc_msg_proposal_prefix *prop)
98{
99 struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
100 const struct in_ifaddr *ifa;
101
102 if (!in_dev)
103 return -ENODEV;
104
105 in_dev_for_each_ifa_rcu(ifa, in_dev) {
106 if (!inet_ifa_match(ipv4, ifa))
107 continue;
108 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
109 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
110 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
111 return 0;
112 }
113 return -ENOENT;
114}
115
116/* fill CLC proposal msg with ipv6 prefixes from device */
117static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
118 struct smc_clc_msg_proposal_prefix *prop,
119 struct smc_clc_ipv6_prefix *ipv6_prfx)
120{
121#if IS_ENABLED(CONFIG_IPV6)
122 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
123 struct inet6_ifaddr *ifa;
124 int cnt = 0;
125
126 if (!in6_dev)
127 return -ENODEV;
128 /* use a maximum of 8 IPv6 prefixes from device */
129 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
130 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
131 continue;
132 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
133 &ifa->addr, ifa->prefix_len);
134 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
135 cnt++;
136 if (cnt == SMC_CLC_MAX_V6_PREFIX)
137 break;
138 }
139 prop->ipv6_prefixes_cnt = cnt;
140 if (cnt)
141 return 0;
142#endif
143 return -ENOENT;
144}
145
146/* retrieve and set prefixes in CLC proposal msg */
147static int smc_clc_prfx_set(struct socket *clcsock,
148 struct smc_clc_msg_proposal_prefix *prop,
149 struct smc_clc_ipv6_prefix *ipv6_prfx)
150{
151 struct dst_entry *dst = sk_dst_get(clcsock->sk);
152 struct sockaddr_storage addrs;
153 struct sockaddr_in6 *addr6;
154 struct sockaddr_in *addr;
155 int rc = -ENOENT;
156
157 memset(prop, 0, sizeof(*prop));
158 if (!dst) {
159 rc = -ENOTCONN;
160 goto out;
161 }
162 if (!dst->dev) {
163 rc = -ENODEV;
164 goto out_rel;
165 }
166 /* get address to which the internal TCP socket is bound */
167 kernel_getsockname(clcsock, (struct sockaddr *)&addrs);
168 /* analyze IP specific data of net_device belonging to TCP socket */
169 addr6 = (struct sockaddr_in6 *)&addrs;
170 rcu_read_lock();
171 if (addrs.ss_family == PF_INET) {
172 /* IPv4 */
173 addr = (struct sockaddr_in *)&addrs;
174 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
175 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
176 /* mapped IPv4 address - peer is IPv4 only */
177 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
178 prop);
179 } else {
180 /* IPv6 */
181 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
182 }
183 rcu_read_unlock();
184out_rel:
185 dst_release(dst);
186out:
187 return rc;
188}
189
190/* match ipv4 addrs of dev against addr in CLC proposal */
191static int smc_clc_prfx_match4_rcu(struct net_device *dev,
192 struct smc_clc_msg_proposal_prefix *prop)
193{
194 struct in_device *in_dev = __in_dev_get_rcu(dev);
195 const struct in_ifaddr *ifa;
196
197 if (!in_dev)
198 return -ENODEV;
199 in_dev_for_each_ifa_rcu(ifa, in_dev) {
200 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
201 inet_ifa_match(prop->outgoing_subnet, ifa))
202 return 0;
203 }
204
205 return -ENOENT;
206}
207
208/* match ipv6 addrs of dev against addrs in CLC proposal */
209static int smc_clc_prfx_match6_rcu(struct net_device *dev,
210 struct smc_clc_msg_proposal_prefix *prop)
211{
212#if IS_ENABLED(CONFIG_IPV6)
213 struct inet6_dev *in6_dev = __in6_dev_get(dev);
214 struct smc_clc_ipv6_prefix *ipv6_prfx;
215 struct inet6_ifaddr *ifa;
216 int i, max;
217
218 if (!in6_dev)
219 return -ENODEV;
220 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
221 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
222 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
223 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
224 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
225 continue;
226 for (i = 0; i < max; i++) {
227 if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
228 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
229 ifa->prefix_len))
230 return 0;
231 }
232 }
233#endif
234 return -ENOENT;
235}
236
237/* check if proposed prefixes match one of our device prefixes */
238int smc_clc_prfx_match(struct socket *clcsock,
239 struct smc_clc_msg_proposal_prefix *prop)
240{
241 struct dst_entry *dst = sk_dst_get(clcsock->sk);
242 int rc;
243
244 if (!dst) {
245 rc = -ENOTCONN;
246 goto out;
247 }
248 if (!dst->dev) {
249 rc = -ENODEV;
250 goto out_rel;
251 }
252 rcu_read_lock();
253 if (!prop->ipv6_prefixes_cnt)
254 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
255 else
256 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
257 rcu_read_unlock();
258out_rel:
259 dst_release(dst);
260out:
261 return rc;
262}
263
264/* Wait for data on the tcp-socket, analyze received data
265 * Returns:
266 * 0 if success and it was not a decline that we received.
267 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
268 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
269 */
270int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
271 u8 expected_type, unsigned long timeout)
272{
273 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
274 struct sock *clc_sk = smc->clcsock->sk;
275 struct smc_clc_msg_hdr *clcm = buf;
276 struct msghdr msg = {NULL, 0};
277 int reason_code = 0;
278 struct kvec vec = {buf, buflen};
279 int len, datlen;
280 int krflags;
281
282 /* peek the first few bytes to determine length of data to receive
283 * so we don't consume any subsequent CLC message or payload data
284 * in the TCP byte stream
285 */
286 /*
287 * Caller must make sure that buflen is no less than
288 * sizeof(struct smc_clc_msg_hdr)
289 */
290 krflags = MSG_PEEK | MSG_WAITALL;
291 clc_sk->sk_rcvtimeo = timeout;
292 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1,
293 sizeof(struct smc_clc_msg_hdr));
294 len = sock_recvmsg(smc->clcsock, &msg, krflags);
295 if (signal_pending(current)) {
296 reason_code = -EINTR;
297 clc_sk->sk_err = EINTR;
298 smc->sk.sk_err = EINTR;
299 goto out;
300 }
301 if (clc_sk->sk_err) {
302 reason_code = -clc_sk->sk_err;
303 if (clc_sk->sk_err == EAGAIN &&
304 expected_type == SMC_CLC_DECLINE)
305 clc_sk->sk_err = 0; /* reset for fallback usage */
306 else
307 smc->sk.sk_err = clc_sk->sk_err;
308 goto out;
309 }
310 if (!len) { /* peer has performed orderly shutdown */
311 smc->sk.sk_err = ECONNRESET;
312 reason_code = -ECONNRESET;
313 goto out;
314 }
315 if (len < 0) {
316 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
317 smc->sk.sk_err = -len;
318 reason_code = len;
319 goto out;
320 }
321 datlen = ntohs(clcm->length);
322 if ((len < sizeof(struct smc_clc_msg_hdr)) ||
323 (datlen > buflen) ||
324 (clcm->version != SMC_CLC_V1) ||
325 (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D &&
326 clcm->path != SMC_TYPE_B) ||
327 ((clcm->type != SMC_CLC_DECLINE) &&
328 (clcm->type != expected_type))) {
329 smc->sk.sk_err = EPROTO;
330 reason_code = -EPROTO;
331 goto out;
332 }
333
334 /* receive the complete CLC message */
335 memset(&msg, 0, sizeof(struct msghdr));
336 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, datlen);
337 krflags = MSG_WAITALL;
338 len = sock_recvmsg(smc->clcsock, &msg, krflags);
339 if (len < datlen || !smc_clc_msg_hdr_valid(clcm)) {
340 smc->sk.sk_err = EPROTO;
341 reason_code = -EPROTO;
342 goto out;
343 }
344 if (clcm->type == SMC_CLC_DECLINE) {
345 struct smc_clc_msg_decline *dclc;
346
347 dclc = (struct smc_clc_msg_decline *)clcm;
348 reason_code = SMC_CLC_DECL_PEERDECL;
349 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
350 if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
351 smc->conn.lgr->sync_err = 1;
352 smc_lgr_terminate(smc->conn.lgr);
353 }
354 }
355
356out:
357 clc_sk->sk_rcvtimeo = rcvtimeo;
358 return reason_code;
359}
360
361/* send CLC DECLINE message across internal TCP socket */
362int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
363{
364 struct smc_clc_msg_decline dclc;
365 struct msghdr msg;
366 struct kvec vec;
367 int len;
368
369 memset(&dclc, 0, sizeof(dclc));
370 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
371 dclc.hdr.type = SMC_CLC_DECLINE;
372 dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
373 dclc.hdr.version = SMC_CLC_V1;
374 dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0;
375 memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid));
376 dclc.peer_diagnosis = htonl(peer_diag_info);
377 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
378
379 memset(&msg, 0, sizeof(msg));
380 vec.iov_base = &dclc;
381 vec.iov_len = sizeof(struct smc_clc_msg_decline);
382 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
383 sizeof(struct smc_clc_msg_decline));
384 if (len < 0 || len < sizeof(struct smc_clc_msg_decline))
385 len = -EPROTO;
386 return len > 0 ? 0 : len;
387}
388
389/* send CLC PROPOSAL message across internal TCP socket */
390int smc_clc_send_proposal(struct smc_sock *smc, int smc_type,
391 struct smc_init_info *ini)
392{
393 struct smc_clc_ipv6_prefix ipv6_prfx[SMC_CLC_MAX_V6_PREFIX];
394 struct smc_clc_msg_proposal_prefix pclc_prfx;
395 struct smc_clc_msg_smcd pclc_smcd;
396 struct smc_clc_msg_proposal pclc;
397 struct smc_clc_msg_trail trl;
398 int len, i, plen, rc;
399 int reason_code = 0;
400 struct kvec vec[5];
401 struct msghdr msg;
402
403 /* retrieve ip prefixes for CLC proposal msg */
404 rc = smc_clc_prfx_set(smc->clcsock, &pclc_prfx, ipv6_prfx);
405 if (rc)
406 return SMC_CLC_DECL_CNFERR; /* configuration error */
407
408 /* send SMC Proposal CLC message */
409 plen = sizeof(pclc) + sizeof(pclc_prfx) +
410 (pclc_prfx.ipv6_prefixes_cnt * sizeof(ipv6_prfx[0])) +
411 sizeof(trl);
412 memset(&pclc, 0, sizeof(pclc));
413 memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
414 pclc.hdr.type = SMC_CLC_PROPOSAL;
415 pclc.hdr.version = SMC_CLC_V1; /* SMC version */
416 pclc.hdr.path = smc_type;
417 if (smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B) {
418 /* add SMC-R specifics */
419 memcpy(pclc.lcl.id_for_peer, local_systemid,
420 sizeof(local_systemid));
421 memcpy(&pclc.lcl.gid, ini->ib_gid, SMC_GID_SIZE);
422 memcpy(&pclc.lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
423 ETH_ALEN);
424 pclc.iparea_offset = htons(0);
425 }
426 if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) {
427 /* add SMC-D specifics */
428 memset(&pclc_smcd, 0, sizeof(pclc_smcd));
429 plen += sizeof(pclc_smcd);
430 pclc.iparea_offset = htons(SMC_CLC_PROPOSAL_MAX_OFFSET);
431 pclc_smcd.gid = ini->ism_dev->local_gid;
432 }
433 pclc.hdr.length = htons(plen);
434
435 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
436 memset(&msg, 0, sizeof(msg));
437 i = 0;
438 vec[i].iov_base = &pclc;
439 vec[i++].iov_len = sizeof(pclc);
440 if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) {
441 vec[i].iov_base = &pclc_smcd;
442 vec[i++].iov_len = sizeof(pclc_smcd);
443 }
444 vec[i].iov_base = &pclc_prfx;
445 vec[i++].iov_len = sizeof(pclc_prfx);
446 if (pclc_prfx.ipv6_prefixes_cnt > 0) {
447 vec[i].iov_base = &ipv6_prfx[0];
448 vec[i++].iov_len = pclc_prfx.ipv6_prefixes_cnt *
449 sizeof(ipv6_prfx[0]);
450 }
451 vec[i].iov_base = &trl;
452 vec[i++].iov_len = sizeof(trl);
453 /* due to the few bytes needed for clc-handshake this cannot block */
454 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
455 if (len < 0) {
456 smc->sk.sk_err = smc->clcsock->sk->sk_err;
457 reason_code = -smc->sk.sk_err;
458 } else if (len < (int)sizeof(pclc)) {
459 reason_code = -ENETUNREACH;
460 smc->sk.sk_err = -reason_code;
461 }
462
463 return reason_code;
464}
465
466/* send CLC CONFIRM message across internal TCP socket */
467int smc_clc_send_confirm(struct smc_sock *smc)
468{
469 struct smc_connection *conn = &smc->conn;
470 struct smc_clc_msg_accept_confirm cclc;
471 struct smc_link *link;
472 int reason_code = 0;
473 struct msghdr msg;
474 struct kvec vec;
475 int len;
476
477 /* send SMC Confirm CLC msg */
478 memset(&cclc, 0, sizeof(cclc));
479 cclc.hdr.type = SMC_CLC_CONFIRM;
480 cclc.hdr.version = SMC_CLC_V1; /* SMC version */
481 if (smc->conn.lgr->is_smcd) {
482 /* SMC-D specific settings */
483 memcpy(cclc.hdr.eyecatcher, SMCD_EYECATCHER,
484 sizeof(SMCD_EYECATCHER));
485 cclc.hdr.path = SMC_TYPE_D;
486 cclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
487 cclc.gid = conn->lgr->smcd->local_gid;
488 cclc.token = conn->rmb_desc->token;
489 cclc.dmbe_size = conn->rmbe_size_short;
490 cclc.dmbe_idx = 0;
491 memcpy(&cclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
492 memcpy(cclc.smcd_trl.eyecatcher, SMCD_EYECATCHER,
493 sizeof(SMCD_EYECATCHER));
494 } else {
495 /* SMC-R specific settings */
496 link = &conn->lgr->lnk[SMC_SINGLE_LINK];
497 memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER,
498 sizeof(SMC_EYECATCHER));
499 cclc.hdr.path = SMC_TYPE_R;
500 cclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
501 memcpy(cclc.lcl.id_for_peer, local_systemid,
502 sizeof(local_systemid));
503 memcpy(&cclc.lcl.gid, link->gid, SMC_GID_SIZE);
504 memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
505 ETH_ALEN);
506 hton24(cclc.qpn, link->roce_qp->qp_num);
507 cclc.rmb_rkey =
508 htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
509 cclc.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
510 cclc.rmbe_alert_token = htonl(conn->alert_token_local);
511 cclc.qp_mtu = min(link->path_mtu, link->peer_mtu);
512 cclc.rmbe_size = conn->rmbe_size_short;
513 cclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
514 (conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
515 hton24(cclc.psn, link->psn_initial);
516 memcpy(cclc.smcr_trl.eyecatcher, SMC_EYECATCHER,
517 sizeof(SMC_EYECATCHER));
518 }
519
520 memset(&msg, 0, sizeof(msg));
521 vec.iov_base = &cclc;
522 vec.iov_len = ntohs(cclc.hdr.length);
523 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
524 ntohs(cclc.hdr.length));
525 if (len < ntohs(cclc.hdr.length)) {
526 if (len >= 0) {
527 reason_code = -ENETUNREACH;
528 smc->sk.sk_err = -reason_code;
529 } else {
530 smc->sk.sk_err = smc->clcsock->sk->sk_err;
531 reason_code = -smc->sk.sk_err;
532 }
533 }
534 return reason_code;
535}
536
537/* send CLC ACCEPT message across internal TCP socket */
538int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact)
539{
540 struct smc_connection *conn = &new_smc->conn;
541 struct smc_clc_msg_accept_confirm aclc;
542 struct smc_link *link;
543 struct msghdr msg;
544 struct kvec vec;
545 int len;
546
547 memset(&aclc, 0, sizeof(aclc));
548 aclc.hdr.type = SMC_CLC_ACCEPT;
549 aclc.hdr.version = SMC_CLC_V1; /* SMC version */
550 if (srv_first_contact)
551 aclc.hdr.flag = 1;
552
553 if (new_smc->conn.lgr->is_smcd) {
554 /* SMC-D specific settings */
555 aclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
556 memcpy(aclc.hdr.eyecatcher, SMCD_EYECATCHER,
557 sizeof(SMCD_EYECATCHER));
558 aclc.hdr.path = SMC_TYPE_D;
559 aclc.gid = conn->lgr->smcd->local_gid;
560 aclc.token = conn->rmb_desc->token;
561 aclc.dmbe_size = conn->rmbe_size_short;
562 aclc.dmbe_idx = 0;
563 memcpy(&aclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
564 memcpy(aclc.smcd_trl.eyecatcher, SMCD_EYECATCHER,
565 sizeof(SMCD_EYECATCHER));
566 } else {
567 /* SMC-R specific settings */
568 aclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
569 memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER,
570 sizeof(SMC_EYECATCHER));
571 aclc.hdr.path = SMC_TYPE_R;
572 link = &conn->lgr->lnk[SMC_SINGLE_LINK];
573 memcpy(aclc.lcl.id_for_peer, local_systemid,
574 sizeof(local_systemid));
575 memcpy(&aclc.lcl.gid, link->gid, SMC_GID_SIZE);
576 memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1],
577 ETH_ALEN);
578 hton24(aclc.qpn, link->roce_qp->qp_num);
579 aclc.rmb_rkey =
580 htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey);
581 aclc.rmbe_idx = 1; /* as long as 1 RMB = 1 RMBE */
582 aclc.rmbe_alert_token = htonl(conn->alert_token_local);
583 aclc.qp_mtu = link->path_mtu;
584 aclc.rmbe_size = conn->rmbe_size_short,
585 aclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
586 (conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl));
587 hton24(aclc.psn, link->psn_initial);
588 memcpy(aclc.smcr_trl.eyecatcher, SMC_EYECATCHER,
589 sizeof(SMC_EYECATCHER));
590 }
591
592 memset(&msg, 0, sizeof(msg));
593 vec.iov_base = &aclc;
594 vec.iov_len = ntohs(aclc.hdr.length);
595 len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1,
596 ntohs(aclc.hdr.length));
597 if (len < ntohs(aclc.hdr.length))
598 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
599
600 return len > 0 ? 0 : len;
601}