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WIP FPC-III support
[linux/fpc-iii.git] / net / smc / smc_clc.c
blobe286dafd6e886b53162ea121b5d86878b9f283c6
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 #include <linux/utsname.h>
18 #include <linux/ctype.h>
19
20 #include <net/addrconf.h>
21 #include <net/sock.h>
22 #include <net/tcp.h>
23
24 #include "smc.h"
25 #include "smc_core.h"
26 #include "smc_clc.h"
27 #include "smc_ib.h"
28 #include "smc_ism.h"
29
30 #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
31 #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
32 #define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
33 #define SMC_CLC_RECV_BUF_LEN 100
34
35 /* eye catcher "SMCR" EBCDIC for CLC messages */
36 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
37 /* eye catcher "SMCD" EBCDIC for CLC messages */
38 static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
39
40 static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
41
42 /* check arriving CLC proposal */
43 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
44 {
45 struct smc_clc_msg_proposal_prefix *pclc_prfx;
46 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
47 struct smc_clc_msg_hdr *hdr = &pclc->hdr;
48 struct smc_clc_v2_extension *v2_ext;
49
50 v2_ext = smc_get_clc_v2_ext(pclc);
51 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
52 if (hdr->version == SMC_V1) {
53 if (hdr->typev1 == SMC_TYPE_N)
54 return false;
55 if (ntohs(hdr->length) !=
56 sizeof(*pclc) + ntohs(pclc->iparea_offset) +
57 sizeof(*pclc_prfx) +
58 pclc_prfx->ipv6_prefixes_cnt *
59 sizeof(struct smc_clc_ipv6_prefix) +
60 sizeof(struct smc_clc_msg_trail))
61 return false;
62 } else {
63 if (ntohs(hdr->length) !=
64 sizeof(*pclc) +
65 sizeof(struct smc_clc_msg_smcd) +
66 (hdr->typev1 != SMC_TYPE_N ?
67 sizeof(*pclc_prfx) +
68 pclc_prfx->ipv6_prefixes_cnt *
69 sizeof(struct smc_clc_ipv6_prefix) : 0) +
70 (hdr->typev2 != SMC_TYPE_N ?
71 sizeof(*v2_ext) +
72 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
73 (smcd_indicated(hdr->typev2) ?
74 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
75 sizeof(struct smc_clc_smcd_gid_chid) :
76 0) +
77 sizeof(struct smc_clc_msg_trail))
78 return false;
79 }
80 return true;
81 }
82
83 /* check arriving CLC accept or confirm */
84 static bool
85 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
86 {
87 struct smc_clc_msg_hdr *hdr = &clc_v2->hdr;
88
89 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
90 return false;
91 if (hdr->version == SMC_V1) {
92 if ((hdr->typev1 == SMC_TYPE_R &&
93 ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
94 (hdr->typev1 == SMC_TYPE_D &&
95 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
96 return false;
97 } else {
98 if (hdr->typev1 == SMC_TYPE_D &&
99 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
100 (ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
101 sizeof(struct smc_clc_first_contact_ext)))
102 return false;
103 }
104 return true;
105 }
106
107 static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
108 {
109 memset(fce, 0, sizeof(*fce));
110 fce->os_type = SMC_CLC_OS_LINUX;
111 fce->release = SMC_RELEASE;
112 memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
113 (*len) += sizeof(*fce);
114 }
115
116 /* check if received message has a correct header length and contains valid
117 * heading and trailing eyecatchers
118 */
119 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
120 {
121 struct smc_clc_msg_accept_confirm_v2 *clc_v2;
122 struct smc_clc_msg_proposal *pclc;
123 struct smc_clc_msg_decline *dclc;
124 struct smc_clc_msg_trail *trl;
125
126 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
127 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
128 return false;
129 switch (clcm->type) {
130 case SMC_CLC_PROPOSAL:
131 pclc = (struct smc_clc_msg_proposal *)clcm;
132 if (!smc_clc_msg_prop_valid(pclc))
133 return false;
134 trl = (struct smc_clc_msg_trail *)
135 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
136 break;
137 case SMC_CLC_ACCEPT:
138 case SMC_CLC_CONFIRM:
139 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm;
140 if (!smc_clc_msg_acc_conf_valid(clc_v2))
141 return false;
142 trl = (struct smc_clc_msg_trail *)
143 ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) -
144 sizeof(*trl));
145 break;
146 case SMC_CLC_DECLINE:
147 dclc = (struct smc_clc_msg_decline *)clcm;
148 if (ntohs(dclc->hdr.length) != sizeof(*dclc))
149 return false;
150 trl = &dclc->trl;
151 break;
152 default:
153 return false;
154 }
155 if (check_trl &&
156 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
157 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
158 return false;
159 return true;
160 }
161
162 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
163 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
164 struct smc_clc_msg_proposal_prefix *prop)
165 {
166 struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
167 const struct in_ifaddr *ifa;
168
169 if (!in_dev)
170 return -ENODEV;
171
172 in_dev_for_each_ifa_rcu(ifa, in_dev) {
173 if (!inet_ifa_match(ipv4, ifa))
174 continue;
175 prop->prefix_len = inet_mask_len(ifa->ifa_mask);
176 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
177 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */
178 return 0;
179 }
180 return -ENOENT;
181 }
182
183 /* fill CLC proposal msg with ipv6 prefixes from device */
184 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
185 struct smc_clc_msg_proposal_prefix *prop,
186 struct smc_clc_ipv6_prefix *ipv6_prfx)
187 {
188 #if IS_ENABLED(CONFIG_IPV6)
189 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
190 struct inet6_ifaddr *ifa;
191 int cnt = 0;
192
193 if (!in6_dev)
194 return -ENODEV;
195 /* use a maximum of 8 IPv6 prefixes from device */
196 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
197 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
198 continue;
199 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
200 &ifa->addr, ifa->prefix_len);
201 ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
202 cnt++;
203 if (cnt == SMC_CLC_MAX_V6_PREFIX)
204 break;
205 }
206 prop->ipv6_prefixes_cnt = cnt;
207 if (cnt)
208 return 0;
209 #endif
210 return -ENOENT;
211 }
212
213 /* retrieve and set prefixes in CLC proposal msg */
214 static int smc_clc_prfx_set(struct socket *clcsock,
215 struct smc_clc_msg_proposal_prefix *prop,
216 struct smc_clc_ipv6_prefix *ipv6_prfx)
217 {
218 struct dst_entry *dst = sk_dst_get(clcsock->sk);
219 struct sockaddr_storage addrs;
220 struct sockaddr_in6 *addr6;
221 struct sockaddr_in *addr;
222 int rc = -ENOENT;
223
224 if (!dst) {
225 rc = -ENOTCONN;
226 goto out;
227 }
228 if (!dst->dev) {
229 rc = -ENODEV;
230 goto out_rel;
231 }
232 /* get address to which the internal TCP socket is bound */
233 kernel_getsockname(clcsock, (struct sockaddr *)&addrs);
234 /* analyze IP specific data of net_device belonging to TCP socket */
235 addr6 = (struct sockaddr_in6 *)&addrs;
236 rcu_read_lock();
237 if (addrs.ss_family == PF_INET) {
238 /* IPv4 */
239 addr = (struct sockaddr_in *)&addrs;
240 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
241 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
242 /* mapped IPv4 address - peer is IPv4 only */
243 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
244 prop);
245 } else {
246 /* IPv6 */
247 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
248 }
249 rcu_read_unlock();
250 out_rel:
251 dst_release(dst);
252 out:
253 return rc;
254 }
255
256 /* match ipv4 addrs of dev against addr in CLC proposal */
257 static int smc_clc_prfx_match4_rcu(struct net_device *dev,
258 struct smc_clc_msg_proposal_prefix *prop)
259 {
260 struct in_device *in_dev = __in_dev_get_rcu(dev);
261 const struct in_ifaddr *ifa;
262
263 if (!in_dev)
264 return -ENODEV;
265 in_dev_for_each_ifa_rcu(ifa, in_dev) {
266 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
267 inet_ifa_match(prop->outgoing_subnet, ifa))
268 return 0;
269 }
270
271 return -ENOENT;
272 }
273
274 /* match ipv6 addrs of dev against addrs in CLC proposal */
275 static int smc_clc_prfx_match6_rcu(struct net_device *dev,
276 struct smc_clc_msg_proposal_prefix *prop)
277 {
278 #if IS_ENABLED(CONFIG_IPV6)
279 struct inet6_dev *in6_dev = __in6_dev_get(dev);
280 struct smc_clc_ipv6_prefix *ipv6_prfx;
281 struct inet6_ifaddr *ifa;
282 int i, max;
283
284 if (!in6_dev)
285 return -ENODEV;
286 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
287 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
288 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
289 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
290 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
291 continue;
292 for (i = 0; i < max; i++) {
293 if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
294 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
295 ifa->prefix_len))
296 return 0;
297 }
298 }
299 #endif
300 return -ENOENT;
301 }
302
303 /* check if proposed prefixes match one of our device prefixes */
304 int smc_clc_prfx_match(struct socket *clcsock,
305 struct smc_clc_msg_proposal_prefix *prop)
306 {
307 struct dst_entry *dst = sk_dst_get(clcsock->sk);
308 int rc;
309
310 if (!dst) {
311 rc = -ENOTCONN;
312 goto out;
313 }
314 if (!dst->dev) {
315 rc = -ENODEV;
316 goto out_rel;
317 }
318 rcu_read_lock();
319 if (!prop->ipv6_prefixes_cnt)
320 rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
321 else
322 rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
323 rcu_read_unlock();
324 out_rel:
325 dst_release(dst);
326 out:
327 return rc;
328 }
329
330 /* Wait for data on the tcp-socket, analyze received data
331 * Returns:
332 * 0 if success and it was not a decline that we received.
333 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
334 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
335 */
336 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
337 u8 expected_type, unsigned long timeout)
338 {
339 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
340 struct sock *clc_sk = smc->clcsock->sk;
341 struct smc_clc_msg_hdr *clcm = buf;
342 struct msghdr msg = {NULL, 0};
343 int reason_code = 0;
344 struct kvec vec = {buf, buflen};
345 int len, datlen, recvlen;
346 bool check_trl = true;
347 int krflags;
348
349 /* peek the first few bytes to determine length of data to receive
350 * so we don't consume any subsequent CLC message or payload data
351 * in the TCP byte stream
352 */
353 /*
354 * Caller must make sure that buflen is no less than
355 * sizeof(struct smc_clc_msg_hdr)
356 */
357 krflags = MSG_PEEK | MSG_WAITALL;
358 clc_sk->sk_rcvtimeo = timeout;
359 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1,
360 sizeof(struct smc_clc_msg_hdr));
361 len = sock_recvmsg(smc->clcsock, &msg, krflags);
362 if (signal_pending(current)) {
363 reason_code = -EINTR;
364 clc_sk->sk_err = EINTR;
365 smc->sk.sk_err = EINTR;
366 goto out;
367 }
368 if (clc_sk->sk_err) {
369 reason_code = -clc_sk->sk_err;
370 if (clc_sk->sk_err == EAGAIN &&
371 expected_type == SMC_CLC_DECLINE)
372 clc_sk->sk_err = 0; /* reset for fallback usage */
373 else
374 smc->sk.sk_err = clc_sk->sk_err;
375 goto out;
376 }
377 if (!len) { /* peer has performed orderly shutdown */
378 smc->sk.sk_err = ECONNRESET;
379 reason_code = -ECONNRESET;
380 goto out;
381 }
382 if (len < 0) {
383 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
384 smc->sk.sk_err = -len;
385 reason_code = len;
386 goto out;
387 }
388 datlen = ntohs(clcm->length);
389 if ((len < sizeof(struct smc_clc_msg_hdr)) ||
390 (clcm->version < SMC_V1) ||
391 ((clcm->type != SMC_CLC_DECLINE) &&
392 (clcm->type != expected_type))) {
393 smc->sk.sk_err = EPROTO;
394 reason_code = -EPROTO;
395 goto out;
396 }
397
398 /* receive the complete CLC message */
399 memset(&msg, 0, sizeof(struct msghdr));
400 if (datlen > buflen) {
401 check_trl = false;
402 recvlen = buflen;
403 } else {
404 recvlen = datlen;
405 }
406 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen);
407 krflags = MSG_WAITALL;
408 len = sock_recvmsg(smc->clcsock, &msg, krflags);
409 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
410 smc->sk.sk_err = EPROTO;
411 reason_code = -EPROTO;
412 goto out;
413 }
414 datlen -= len;
415 while (datlen) {
416 u8 tmp[SMC_CLC_RECV_BUF_LEN];
417
418 vec.iov_base = &tmp;
419 vec.iov_len = SMC_CLC_RECV_BUF_LEN;
420 /* receive remaining proposal message */
421 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
422 SMC_CLC_RECV_BUF_LEN : datlen;
423 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen);
424 len = sock_recvmsg(smc->clcsock, &msg, krflags);
425 datlen -= len;
426 }
427 if (clcm->type == SMC_CLC_DECLINE) {
428 struct smc_clc_msg_decline *dclc;
429
430 dclc = (struct smc_clc_msg_decline *)clcm;
431 reason_code = SMC_CLC_DECL_PEERDECL;
432 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
433 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
434 SMC_FIRST_CONTACT_MASK) {
435 smc->conn.lgr->sync_err = 1;
436 smc_lgr_terminate_sched(smc->conn.lgr);
437 }
438 }
439
440 out:
441 clc_sk->sk_rcvtimeo = rcvtimeo;
442 return reason_code;
443 }
444
445 /* send CLC DECLINE message across internal TCP socket */
446 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
447 {
448 struct smc_clc_msg_decline dclc;
449 struct msghdr msg;
450 struct kvec vec;
451 int len;
452
453 memset(&dclc, 0, sizeof(dclc));
454 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
455 dclc.hdr.type = SMC_CLC_DECLINE;
456 dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
457 dclc.hdr.version = version;
458 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
459 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
460 SMC_FIRST_CONTACT_MASK : 0;
461 if ((!smc->conn.lgr || !smc->conn.lgr->is_smcd) &&
462 smc_ib_is_valid_local_systemid())
463 memcpy(dclc.id_for_peer, local_systemid,
464 sizeof(local_systemid));
465 dclc.peer_diagnosis = htonl(peer_diag_info);
466 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
467
468 memset(&msg, 0, sizeof(msg));
469 vec.iov_base = &dclc;
470 vec.iov_len = sizeof(struct smc_clc_msg_decline);
471 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
472 sizeof(struct smc_clc_msg_decline));
473 if (len < 0 || len < sizeof(struct smc_clc_msg_decline))
474 len = -EPROTO;
475 return len > 0 ? 0 : len;
476 }
477
478 /* send CLC PROPOSAL message across internal TCP socket */
479 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
480 {
481 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
482 struct smc_clc_msg_proposal_prefix *pclc_prfx;
483 struct smc_clc_msg_proposal *pclc_base;
484 struct smc_clc_smcd_gid_chid *gidchids;
485 struct smc_clc_msg_proposal_area *pclc;
486 struct smc_clc_ipv6_prefix *ipv6_prfx;
487 struct smc_clc_v2_extension *v2_ext;
488 struct smc_clc_msg_smcd *pclc_smcd;
489 struct smc_clc_msg_trail *trl;
490 int len, i, plen, rc;
491 int reason_code = 0;
492 struct kvec vec[8];
493 struct msghdr msg;
494
495 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
496 if (!pclc)
497 return -ENOMEM;
498
499 pclc_base = &pclc->pclc_base;
500 pclc_smcd = &pclc->pclc_smcd;
501 pclc_prfx = &pclc->pclc_prfx;
502 ipv6_prfx = pclc->pclc_prfx_ipv6;
503 v2_ext = &pclc->pclc_v2_ext;
504 smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
505 gidchids = pclc->pclc_gidchids;
506 trl = &pclc->pclc_trl;
507
508 pclc_base->hdr.version = SMC_V2;
509 pclc_base->hdr.typev1 = ini->smc_type_v1;
510 pclc_base->hdr.typev2 = ini->smc_type_v2;
511 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
512
513 /* retrieve ip prefixes for CLC proposal msg */
514 if (ini->smc_type_v1 != SMC_TYPE_N) {
515 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
516 if (rc) {
517 if (ini->smc_type_v2 == SMC_TYPE_N) {
518 kfree(pclc);
519 return SMC_CLC_DECL_CNFERR;
520 }
521 pclc_base->hdr.typev1 = SMC_TYPE_N;
522 } else {
523 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
524 plen += sizeof(*pclc_prfx) +
525 pclc_prfx->ipv6_prefixes_cnt *
526 sizeof(ipv6_prfx[0]);
527 }
528 }
529
530 /* build SMC Proposal CLC message */
531 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
532 sizeof(SMC_EYECATCHER));
533 pclc_base->hdr.type = SMC_CLC_PROPOSAL;
534 if (smcr_indicated(ini->smc_type_v1)) {
535 /* add SMC-R specifics */
536 memcpy(pclc_base->lcl.id_for_peer, local_systemid,
537 sizeof(local_systemid));
538 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
539 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
540 ETH_ALEN);
541 }
542 if (smcd_indicated(ini->smc_type_v1)) {
543 /* add SMC-D specifics */
544 if (ini->ism_dev[0]) {
545 pclc_smcd->ism.gid = htonll(ini->ism_dev[0]->local_gid);
546 pclc_smcd->ism.chid =
547 htons(smc_ism_get_chid(ini->ism_dev[0]));
548 }
549 }
550 if (ini->smc_type_v2 == SMC_TYPE_N) {
551 pclc_smcd->v2_ext_offset = 0;
552 } else {
553 u16 v2_ext_offset;
554 u8 *eid = NULL;
555
556 v2_ext_offset = sizeof(*pclc_smcd) -
557 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
558 if (ini->smc_type_v1 != SMC_TYPE_N)
559 v2_ext_offset += sizeof(*pclc_prfx) +
560 pclc_prfx->ipv6_prefixes_cnt *
561 sizeof(ipv6_prfx[0]);
562 pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
563 v2_ext->hdr.eid_cnt = 0;
564 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt;
565 v2_ext->hdr.flag.release = SMC_RELEASE;
566 v2_ext->hdr.flag.seid = 1;
567 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
568 offsetofend(struct smc_clnt_opts_area_hdr,
569 smcd_v2_ext_offset) +
570 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
571 if (ini->ism_dev[0])
572 smc_ism_get_system_eid(ini->ism_dev[0], &eid);
573 else
574 smc_ism_get_system_eid(ini->ism_dev[1], &eid);
575 if (eid)
576 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
577 plen += sizeof(*v2_ext) + sizeof(*smcd_v2_ext);
578 if (ini->ism_offered_cnt) {
579 for (i = 1; i <= ini->ism_offered_cnt; i++) {
580 gidchids[i - 1].gid =
581 htonll(ini->ism_dev[i]->local_gid);
582 gidchids[i - 1].chid =
583 htons(smc_ism_get_chid(ini->ism_dev[i]));
584 }
585 plen += ini->ism_offered_cnt *
586 sizeof(struct smc_clc_smcd_gid_chid);
587 }
588 }
589 pclc_base->hdr.length = htons(plen);
590 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
591
592 /* send SMC Proposal CLC message */
593 memset(&msg, 0, sizeof(msg));
594 i = 0;
595 vec[i].iov_base = pclc_base;
596 vec[i++].iov_len = sizeof(*pclc_base);
597 vec[i].iov_base = pclc_smcd;
598 vec[i++].iov_len = sizeof(*pclc_smcd);
599 if (ini->smc_type_v1 != SMC_TYPE_N) {
600 vec[i].iov_base = pclc_prfx;
601 vec[i++].iov_len = sizeof(*pclc_prfx);
602 if (pclc_prfx->ipv6_prefixes_cnt > 0) {
603 vec[i].iov_base = ipv6_prfx;
604 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
605 sizeof(ipv6_prfx[0]);
606 }
607 }
608 if (ini->smc_type_v2 != SMC_TYPE_N) {
609 vec[i].iov_base = v2_ext;
610 vec[i++].iov_len = sizeof(*v2_ext);
611 vec[i].iov_base = smcd_v2_ext;
612 vec[i++].iov_len = sizeof(*smcd_v2_ext);
613 if (ini->ism_offered_cnt) {
614 vec[i].iov_base = gidchids;
615 vec[i++].iov_len = ini->ism_offered_cnt *
616 sizeof(struct smc_clc_smcd_gid_chid);
617 }
618 }
619 vec[i].iov_base = trl;
620 vec[i++].iov_len = sizeof(*trl);
621 /* due to the few bytes needed for clc-handshake this cannot block */
622 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
623 if (len < 0) {
624 smc->sk.sk_err = smc->clcsock->sk->sk_err;
625 reason_code = -smc->sk.sk_err;
626 } else if (len < ntohs(pclc_base->hdr.length)) {
627 reason_code = -ENETUNREACH;
628 smc->sk.sk_err = -reason_code;
629 }
630
631 kfree(pclc);
632 return reason_code;
633 }
634
635 /* build and send CLC CONFIRM / ACCEPT message */
636 static int smc_clc_send_confirm_accept(struct smc_sock *smc,
637 struct smc_clc_msg_accept_confirm_v2 *clc_v2,
638 int first_contact, u8 version)
639 {
640 struct smc_connection *conn = &smc->conn;
641 struct smc_clc_msg_accept_confirm *clc;
642 struct smc_clc_first_contact_ext fce;
643 struct smc_clc_msg_trail trl;
644 struct kvec vec[3];
645 struct msghdr msg;
646 int i, len;
647
648 /* send SMC Confirm CLC msg */
649 clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
650 clc->hdr.version = version; /* SMC version */
651 if (first_contact)
652 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK;
653 if (conn->lgr->is_smcd) {
654 /* SMC-D specific settings */
655 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER,
656 sizeof(SMCD_EYECATCHER));
657 clc->hdr.typev1 = SMC_TYPE_D;
658 clc->d0.gid = conn->lgr->smcd->local_gid;
659 clc->d0.token = conn->rmb_desc->token;
660 clc->d0.dmbe_size = conn->rmbe_size_short;
661 clc->d0.dmbe_idx = 0;
662 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE);
663 if (version == SMC_V1) {
664 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN);
665 } else {
666 u8 *eid = NULL;
667
668 clc_v2->chid = htons(smc_ism_get_chid(conn->lgr->smcd));
669 smc_ism_get_system_eid(conn->lgr->smcd, &eid);
670 if (eid)
671 memcpy(clc_v2->eid, eid, SMC_MAX_EID_LEN);
672 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
673 if (first_contact)
674 smc_clc_fill_fce(&fce, &len);
675 clc_v2->hdr.length = htons(len);
676 }
677 memcpy(trl.eyecatcher, SMCD_EYECATCHER,
678 sizeof(SMCD_EYECATCHER));
679 } else {
680 struct smc_link *link = conn->lnk;
681
682 /* SMC-R specific settings */
683 link = conn->lnk;
684 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER,
685 sizeof(SMC_EYECATCHER));
686 clc->hdr.typev1 = SMC_TYPE_R;
687 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN);
688 memcpy(clc->r0.lcl.id_for_peer, local_systemid,
689 sizeof(local_systemid));
690 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE);
691 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1],
692 ETH_ALEN);
693 hton24(clc->r0.qpn, link->roce_qp->qp_num);
694 clc->r0.rmb_rkey =
695 htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey);
696 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */
697 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local);
698 switch (clc->hdr.type) {
699 case SMC_CLC_ACCEPT:
700 clc->r0.qp_mtu = link->path_mtu;
701 break;
702 case SMC_CLC_CONFIRM:
703 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu);
704 break;
705 }
706 clc->r0.rmbe_size = conn->rmbe_size_short;
707 clc->r0.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address
708 (conn->rmb_desc->sgt[link->link_idx].sgl));
709 hton24(clc->r0.psn, link->psn_initial);
710 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
711 }
712
713 memset(&msg, 0, sizeof(msg));
714 i = 0;
715 vec[i].iov_base = clc_v2;
716 if (version > SMC_V1)
717 vec[i++].iov_len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 - sizeof(trl);
718 else
719 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ?
720 SMCD_CLC_ACCEPT_CONFIRM_LEN :
721 SMCR_CLC_ACCEPT_CONFIRM_LEN) -
722 sizeof(trl);
723 if (version > SMC_V1 && first_contact) {
724 vec[i].iov_base = &fce;
725 vec[i++].iov_len = sizeof(fce);
726 }
727 vec[i].iov_base = &trl;
728 vec[i++].iov_len = sizeof(trl);
729 return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
730 ntohs(clc->hdr.length));
731 }
732
733 /* send CLC CONFIRM message across internal TCP socket */
734 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
735 u8 version)
736 {
737 struct smc_clc_msg_accept_confirm_v2 cclc_v2;
738 int reason_code = 0;
739 int len;
740
741 /* send SMC Confirm CLC msg */
742 memset(&cclc_v2, 0, sizeof(cclc_v2));
743 cclc_v2.hdr.type = SMC_CLC_CONFIRM;
744 len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact,
745 version);
746 if (len < ntohs(cclc_v2.hdr.length)) {
747 if (len >= 0) {
748 reason_code = -ENETUNREACH;
749 smc->sk.sk_err = -reason_code;
750 } else {
751 smc->sk.sk_err = smc->clcsock->sk->sk_err;
752 reason_code = -smc->sk.sk_err;
753 }
754 }
755 return reason_code;
756 }
757
758 /* send CLC ACCEPT message across internal TCP socket */
759 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
760 u8 version)
761 {
762 struct smc_clc_msg_accept_confirm_v2 aclc_v2;
763 int len;
764
765 memset(&aclc_v2, 0, sizeof(aclc_v2));
766 aclc_v2.hdr.type = SMC_CLC_ACCEPT;
767 len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact,
768 version);
769 if (len < ntohs(aclc_v2.hdr.length))
770 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err;
771
772 return len > 0 ? 0 : len;
773 }
774
775 void smc_clc_get_hostname(u8 **host)
776 {
777 *host = &smc_hostname[0];
778 }
779
780 void __init smc_clc_init(void)
781 {
782 struct new_utsname *u;
783
784 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
785 u = utsname();
786 memcpy(smc_hostname, u->nodename,
787 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
788 }
Linux with added FPC-III support