1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Basic Transport Functions exploiting Infiniband API 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 12 #include <linux/socket.h> 13 #include <linux/if_vlan.h> 14 #include <linux/random.h> 15 #include <linux/workqueue.h> 16 #include <linux/wait.h> 17 #include <linux/reboot.h> 18 #include <linux/mutex.h> 19 #include <linux/list.h> 20 #include <linux/smc.h> 21 #include <net/tcp.h> 22 #include <net/sock.h> 23 #include <rdma/ib_verbs.h> 24 #include <rdma/ib_cache.h> 25 26 #include "smc.h" 27 #include "smc_clc.h" 28 #include "smc_core.h" 29 #include "smc_ib.h" 30 #include "smc_wr.h" 31 #include "smc_llc.h" 32 #include "smc_cdc.h" 33 #include "smc_close.h" 34 #include "smc_ism.h" 35 #include "smc_netlink.h" 36 #include "smc_stats.h" 37 #include "smc_tracepoint.h" 38 39 #define SMC_LGR_NUM_INCR 256 40 #define SMC_LGR_FREE_DELAY_SERV (600 * HZ) 41 #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ) 42 43 struct smc_lgr_list smc_lgr_list = { /* established link groups */ 44 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), 45 .list = LIST_HEAD_INIT(smc_lgr_list.list), 46 .num = 0, 47 }; 48 49 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */ 50 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted); 51 52 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 53 struct smc_buf_desc *buf_desc); 54 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft); 55 56 static void smc_link_down_work(struct work_struct *work); 57 58 /* return head of link group list and its lock for a given link group */ 59 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr, 60 spinlock_t **lgr_lock) 61 { 62 if (lgr->is_smcd) { 63 *lgr_lock = &lgr->smcd->lgr_lock; 64 return &lgr->smcd->lgr_list; 65 } 66 67 *lgr_lock = &smc_lgr_list.lock; 68 return &smc_lgr_list.list; 69 } 70 71 static void smc_ibdev_cnt_inc(struct smc_link *lnk) 72 { 73 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]); 74 } 75 76 static void smc_ibdev_cnt_dec(struct smc_link *lnk) 77 { 78 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]); 79 } 80 81 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr) 82 { 83 /* client link group creation always follows the server link group 84 * creation. For client use a somewhat higher removal delay time, 85 * otherwise there is a risk of out-of-sync link groups. 86 */ 87 if (!lgr->freeing) { 88 mod_delayed_work(system_wq, &lgr->free_work, 89 (!lgr->is_smcd && lgr->role == SMC_CLNT) ? 90 SMC_LGR_FREE_DELAY_CLNT : 91 SMC_LGR_FREE_DELAY_SERV); 92 } 93 } 94 95 /* Register connection's alert token in our lookup structure. 96 * To use rbtrees we have to implement our own insert core. 97 * Requires @conns_lock 98 * @smc connection to register 99 * Returns 0 on success, != otherwise. 100 */ 101 static void smc_lgr_add_alert_token(struct smc_connection *conn) 102 { 103 struct rb_node **link, *parent = NULL; 104 u32 token = conn->alert_token_local; 105 106 link = &conn->lgr->conns_all.rb_node; 107 while (*link) { 108 struct smc_connection *cur = rb_entry(*link, 109 struct smc_connection, alert_node); 110 111 parent = *link; 112 if (cur->alert_token_local > token) 113 link = &parent->rb_left; 114 else 115 link = &parent->rb_right; 116 } 117 /* Put the new node there */ 118 rb_link_node(&conn->alert_node, parent, link); 119 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); 120 } 121 122 /* assign an SMC-R link to the connection */ 123 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first) 124 { 125 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING : 126 SMC_LNK_ACTIVE; 127 int i, j; 128 129 /* do link balancing */ 130 conn->lnk = NULL; /* reset conn->lnk first */ 131 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 132 struct smc_link *lnk = &conn->lgr->lnk[i]; 133 134 if (lnk->state != expected || lnk->link_is_asym) 135 continue; 136 if (conn->lgr->role == SMC_CLNT) { 137 conn->lnk = lnk; /* temporary, SMC server assigns link*/ 138 break; 139 } 140 if (conn->lgr->conns_num % 2) { 141 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) { 142 struct smc_link *lnk2; 143 144 lnk2 = &conn->lgr->lnk[j]; 145 if (lnk2->state == expected && 146 !lnk2->link_is_asym) { 147 conn->lnk = lnk2; 148 break; 149 } 150 } 151 } 152 if (!conn->lnk) 153 conn->lnk = lnk; 154 break; 155 } 156 if (!conn->lnk) 157 return SMC_CLC_DECL_NOACTLINK; 158 atomic_inc(&conn->lnk->conn_cnt); 159 return 0; 160 } 161 162 /* Register connection in link group by assigning an alert token 163 * registered in a search tree. 164 * Requires @conns_lock 165 * Note that '0' is a reserved value and not assigned. 166 */ 167 static int smc_lgr_register_conn(struct smc_connection *conn, bool first) 168 { 169 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 170 static atomic_t nexttoken = ATOMIC_INIT(0); 171 int rc; 172 173 if (!conn->lgr->is_smcd) { 174 rc = smcr_lgr_conn_assign_link(conn, first); 175 if (rc) { 176 conn->lgr = NULL; 177 return rc; 178 } 179 } 180 /* find a new alert_token_local value not yet used by some connection 181 * in this link group 182 */ 183 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ 184 while (!conn->alert_token_local) { 185 conn->alert_token_local = atomic_inc_return(&nexttoken); 186 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) 187 conn->alert_token_local = 0; 188 } 189 smc_lgr_add_alert_token(conn); 190 conn->lgr->conns_num++; 191 return 0; 192 } 193 194 /* Unregister connection and reset the alert token of the given connection< 195 */ 196 static void __smc_lgr_unregister_conn(struct smc_connection *conn) 197 { 198 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 199 struct smc_link_group *lgr = conn->lgr; 200 201 rb_erase(&conn->alert_node, &lgr->conns_all); 202 if (conn->lnk) 203 atomic_dec(&conn->lnk->conn_cnt); 204 lgr->conns_num--; 205 conn->alert_token_local = 0; 206 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ 207 } 208 209 /* Unregister connection from lgr 210 */ 211 static void smc_lgr_unregister_conn(struct smc_connection *conn) 212 { 213 struct smc_link_group *lgr = conn->lgr; 214 215 if (!smc_conn_lgr_valid(conn)) 216 return; 217 write_lock_bh(&lgr->conns_lock); 218 if (conn->alert_token_local) { 219 __smc_lgr_unregister_conn(conn); 220 } 221 write_unlock_bh(&lgr->conns_lock); 222 } 223 224 static void smc_lgr_buf_list_add(struct smc_link_group *lgr, 225 bool is_rmb, 226 struct list_head *buf_list, 227 struct smc_buf_desc *buf_desc) 228 { 229 list_add(&buf_desc->list, buf_list); 230 if (is_rmb) { 231 lgr->alloc_rmbs += buf_desc->len; 232 lgr->alloc_rmbs += 233 lgr->is_smcd ? sizeof(struct smcd_cdc_msg) : 0; 234 } else { 235 lgr->alloc_sndbufs += buf_desc->len; 236 } 237 } 238 239 static void smc_lgr_buf_list_del(struct smc_link_group *lgr, 240 bool is_rmb, 241 struct smc_buf_desc *buf_desc) 242 { 243 list_del(&buf_desc->list); 244 if (is_rmb) { 245 lgr->alloc_rmbs -= buf_desc->len; 246 lgr->alloc_rmbs -= 247 lgr->is_smcd ? sizeof(struct smcd_cdc_msg) : 0; 248 } else { 249 lgr->alloc_sndbufs -= buf_desc->len; 250 } 251 } 252 253 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb) 254 { 255 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 256 char hostname[SMC_MAX_HOSTNAME_LEN + 1]; 257 char smc_seid[SMC_MAX_EID_LEN + 1]; 258 struct nlattr *attrs; 259 u8 *seid = NULL; 260 u8 *host = NULL; 261 void *nlh; 262 263 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 264 &smc_gen_nl_family, NLM_F_MULTI, 265 SMC_NETLINK_GET_SYS_INFO); 266 if (!nlh) 267 goto errmsg; 268 if (cb_ctx->pos[0]) 269 goto errout; 270 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO); 271 if (!attrs) 272 goto errout; 273 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2)) 274 goto errattr; 275 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE)) 276 goto errattr; 277 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable())) 278 goto errattr; 279 if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true)) 280 goto errattr; 281 smc_clc_get_hostname(&host); 282 if (host) { 283 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN); 284 hostname[SMC_MAX_HOSTNAME_LEN] = 0; 285 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname)) 286 goto errattr; 287 } 288 if (smc_ism_is_v2_capable()) { 289 smc_ism_get_system_eid(&seid); 290 memcpy(smc_seid, seid, SMC_MAX_EID_LEN); 291 smc_seid[SMC_MAX_EID_LEN] = 0; 292 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid)) 293 goto errattr; 294 } 295 nla_nest_end(skb, attrs); 296 genlmsg_end(skb, nlh); 297 cb_ctx->pos[0] = 1; 298 return skb->len; 299 300 errattr: 301 nla_nest_cancel(skb, attrs); 302 errout: 303 genlmsg_cancel(skb, nlh); 304 errmsg: 305 return skb->len; 306 } 307 308 /* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */ 309 static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr, 310 struct sk_buff *skb, 311 struct netlink_callback *cb, 312 struct nlattr *v2_attrs) 313 { 314 char smc_host[SMC_MAX_HOSTNAME_LEN + 1]; 315 char smc_eid[SMC_MAX_EID_LEN + 1]; 316 317 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version)) 318 goto errv2attr; 319 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release)) 320 goto errv2attr; 321 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os)) 322 goto errv2attr; 323 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN); 324 smc_host[SMC_MAX_HOSTNAME_LEN] = 0; 325 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host)) 326 goto errv2attr; 327 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN); 328 smc_eid[SMC_MAX_EID_LEN] = 0; 329 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid)) 330 goto errv2attr; 331 332 nla_nest_end(skb, v2_attrs); 333 return 0; 334 335 errv2attr: 336 nla_nest_cancel(skb, v2_attrs); 337 return -EMSGSIZE; 338 } 339 340 static int smc_nl_fill_smcr_lgr_v2(struct smc_link_group *lgr, 341 struct sk_buff *skb, 342 struct netlink_callback *cb) 343 { 344 struct nlattr *v2_attrs; 345 346 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2); 347 if (!v2_attrs) 348 goto errattr; 349 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_DIRECT, !lgr->uses_gateway)) 350 goto errv2attr; 351 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_MAX_CONNS, lgr->max_conns)) 352 goto errv2attr; 353 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_MAX_LINKS, lgr->max_links)) 354 goto errv2attr; 355 356 nla_nest_end(skb, v2_attrs); 357 return 0; 358 359 errv2attr: 360 nla_nest_cancel(skb, v2_attrs); 361 errattr: 362 return -EMSGSIZE; 363 } 364 365 static int smc_nl_fill_lgr(struct smc_link_group *lgr, 366 struct sk_buff *skb, 367 struct netlink_callback *cb) 368 { 369 char smc_target[SMC_MAX_PNETID_LEN + 1]; 370 struct nlattr *attrs, *v2_attrs; 371 372 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR); 373 if (!attrs) 374 goto errout; 375 376 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id))) 377 goto errattr; 378 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num)) 379 goto errattr; 380 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role)) 381 goto errattr; 382 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type)) 383 goto errattr; 384 if (nla_put_u8(skb, SMC_NLA_LGR_R_BUF_TYPE, lgr->buf_type)) 385 goto errattr; 386 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id)) 387 goto errattr; 388 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE, 389 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD)) 390 goto errattr; 391 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN); 392 smc_target[SMC_MAX_PNETID_LEN] = 0; 393 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target)) 394 goto errattr; 395 if (nla_put_uint(skb, SMC_NLA_LGR_R_SNDBUF_ALLOC, lgr->alloc_sndbufs)) 396 goto errattr; 397 if (nla_put_uint(skb, SMC_NLA_LGR_R_RMB_ALLOC, lgr->alloc_rmbs)) 398 goto errattr; 399 if (lgr->smc_version > SMC_V1) { 400 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON); 401 if (!v2_attrs) 402 goto errattr; 403 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 404 goto errattr; 405 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb)) 406 goto errattr; 407 } 408 409 nla_nest_end(skb, attrs); 410 return 0; 411 errattr: 412 nla_nest_cancel(skb, attrs); 413 errout: 414 return -EMSGSIZE; 415 } 416 417 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr, 418 struct smc_link *link, 419 struct sk_buff *skb, 420 struct netlink_callback *cb) 421 { 422 char smc_ibname[IB_DEVICE_NAME_MAX]; 423 u8 smc_gid_target[41]; 424 struct nlattr *attrs; 425 u32 link_uid = 0; 426 void *nlh; 427 428 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 429 &smc_gen_nl_family, NLM_F_MULTI, 430 SMC_NETLINK_GET_LINK_SMCR); 431 if (!nlh) 432 goto errmsg; 433 434 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR); 435 if (!attrs) 436 goto errout; 437 438 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id)) 439 goto errattr; 440 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state)) 441 goto errattr; 442 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT, 443 atomic_read(&link->conn_cnt))) 444 goto errattr; 445 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport)) 446 goto errattr; 447 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx)) 448 goto errattr; 449 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname); 450 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname)) 451 goto errattr; 452 memcpy(&link_uid, link->link_uid, sizeof(link_uid)); 453 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid)) 454 goto errattr; 455 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid)); 456 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid)) 457 goto errattr; 458 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 459 smc_gid_be16_convert(smc_gid_target, link->gid); 460 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target)) 461 goto errattr; 462 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 463 smc_gid_be16_convert(smc_gid_target, link->peer_gid); 464 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target)) 465 goto errattr; 466 467 nla_nest_end(skb, attrs); 468 genlmsg_end(skb, nlh); 469 return 0; 470 errattr: 471 nla_nest_cancel(skb, attrs); 472 errout: 473 genlmsg_cancel(skb, nlh); 474 errmsg: 475 return -EMSGSIZE; 476 } 477 478 static int smc_nl_handle_lgr(struct smc_link_group *lgr, 479 struct sk_buff *skb, 480 struct netlink_callback *cb, 481 bool list_links) 482 { 483 void *nlh; 484 int i; 485 486 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 487 &smc_gen_nl_family, NLM_F_MULTI, 488 SMC_NETLINK_GET_LGR_SMCR); 489 if (!nlh) 490 goto errmsg; 491 if (smc_nl_fill_lgr(lgr, skb, cb)) 492 goto errout; 493 494 genlmsg_end(skb, nlh); 495 if (!list_links) 496 goto out; 497 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 498 if (!smc_link_usable(&lgr->lnk[i])) 499 continue; 500 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb)) 501 goto errout; 502 } 503 out: 504 return 0; 505 506 errout: 507 genlmsg_cancel(skb, nlh); 508 errmsg: 509 return -EMSGSIZE; 510 } 511 512 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr, 513 struct sk_buff *skb, 514 struct netlink_callback *cb, 515 bool list_links) 516 { 517 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 518 struct smc_link_group *lgr; 519 int snum = cb_ctx->pos[0]; 520 int num = 0; 521 522 spin_lock_bh(&smc_lgr->lock); 523 list_for_each_entry(lgr, &smc_lgr->list, list) { 524 if (num < snum) 525 goto next; 526 if (smc_nl_handle_lgr(lgr, skb, cb, list_links)) 527 goto errout; 528 next: 529 num++; 530 } 531 errout: 532 spin_unlock_bh(&smc_lgr->lock); 533 cb_ctx->pos[0] = num; 534 } 535 536 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr, 537 struct sk_buff *skb, 538 struct netlink_callback *cb) 539 { 540 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 541 struct smcd_dev *smcd = lgr->smcd; 542 struct smcd_gid smcd_gid; 543 struct nlattr *attrs; 544 void *nlh; 545 546 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 547 &smc_gen_nl_family, NLM_F_MULTI, 548 SMC_NETLINK_GET_LGR_SMCD); 549 if (!nlh) 550 goto errmsg; 551 552 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD); 553 if (!attrs) 554 goto errout; 555 556 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id))) 557 goto errattr; 558 smcd->ops->get_local_gid(smcd, &smcd_gid); 559 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, 560 smcd_gid.gid, SMC_NLA_LGR_D_PAD)) 561 goto errattr; 562 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_EXT_GID, 563 smcd_gid.gid_ext, SMC_NLA_LGR_D_PAD)) 564 goto errattr; 565 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid.gid, 566 SMC_NLA_LGR_D_PAD)) 567 goto errattr; 568 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_EXT_GID, 569 lgr->peer_gid.gid_ext, SMC_NLA_LGR_D_PAD)) 570 goto errattr; 571 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id)) 572 goto errattr; 573 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num)) 574 goto errattr; 575 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd))) 576 goto errattr; 577 if (nla_put_uint(skb, SMC_NLA_LGR_D_SNDBUF_ALLOC, lgr->alloc_sndbufs)) 578 goto errattr; 579 if (nla_put_uint(skb, SMC_NLA_LGR_D_DMB_ALLOC, lgr->alloc_rmbs)) 580 goto errattr; 581 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN); 582 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 583 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet)) 584 goto errattr; 585 if (lgr->smc_version > SMC_V1) { 586 struct nlattr *v2_attrs; 587 588 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON); 589 if (!v2_attrs) 590 goto errattr; 591 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 592 goto errattr; 593 } 594 nla_nest_end(skb, attrs); 595 genlmsg_end(skb, nlh); 596 return 0; 597 598 errattr: 599 nla_nest_cancel(skb, attrs); 600 errout: 601 genlmsg_cancel(skb, nlh); 602 errmsg: 603 return -EMSGSIZE; 604 } 605 606 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev, 607 struct sk_buff *skb, 608 struct netlink_callback *cb) 609 { 610 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 611 struct smc_link_group *lgr; 612 int snum = cb_ctx->pos[1]; 613 int rc = 0, num = 0; 614 615 spin_lock_bh(&dev->lgr_lock); 616 list_for_each_entry(lgr, &dev->lgr_list, list) { 617 if (!lgr->is_smcd) 618 continue; 619 if (num < snum) 620 goto next; 621 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb); 622 if (rc) 623 goto errout; 624 next: 625 num++; 626 } 627 errout: 628 spin_unlock_bh(&dev->lgr_lock); 629 cb_ctx->pos[1] = num; 630 return rc; 631 } 632 633 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list, 634 struct sk_buff *skb, 635 struct netlink_callback *cb) 636 { 637 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 638 struct smcd_dev *smcd_dev; 639 int snum = cb_ctx->pos[0]; 640 int rc = 0, num = 0; 641 642 mutex_lock(&dev_list->mutex); 643 list_for_each_entry(smcd_dev, &dev_list->list, list) { 644 if (list_empty(&smcd_dev->lgr_list)) 645 continue; 646 if (num < snum) 647 goto next; 648 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb); 649 if (rc) 650 goto errout; 651 next: 652 num++; 653 } 654 errout: 655 mutex_unlock(&dev_list->mutex); 656 cb_ctx->pos[0] = num; 657 return rc; 658 } 659 660 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 661 { 662 bool list_links = false; 663 664 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 665 return skb->len; 666 } 667 668 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb) 669 { 670 bool list_links = true; 671 672 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 673 return skb->len; 674 } 675 676 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 677 { 678 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb); 679 return skb->len; 680 } 681 682 void smc_lgr_cleanup_early(struct smc_link_group *lgr) 683 { 684 spinlock_t *lgr_lock; 685 686 if (!lgr) 687 return; 688 689 smc_lgr_list_head(lgr, &lgr_lock); 690 spin_lock_bh(lgr_lock); 691 /* do not use this link group for new connections */ 692 if (!list_empty(&lgr->list)) 693 list_del_init(&lgr->list); 694 spin_unlock_bh(lgr_lock); 695 __smc_lgr_terminate(lgr, true); 696 } 697 698 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 699 { 700 int i; 701 702 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 703 struct smc_link *lnk = &lgr->lnk[i]; 704 705 if (smc_link_sendable(lnk)) 706 lnk->state = SMC_LNK_INACTIVE; 707 } 708 wake_up_all(&lgr->llc_msg_waiter); 709 wake_up_all(&lgr->llc_flow_waiter); 710 } 711 712 static void smc_lgr_free(struct smc_link_group *lgr); 713 714 static void smc_lgr_free_work(struct work_struct *work) 715 { 716 struct smc_link_group *lgr = container_of(to_delayed_work(work), 717 struct smc_link_group, 718 free_work); 719 spinlock_t *lgr_lock; 720 bool conns; 721 722 smc_lgr_list_head(lgr, &lgr_lock); 723 spin_lock_bh(lgr_lock); 724 if (lgr->freeing) { 725 spin_unlock_bh(lgr_lock); 726 return; 727 } 728 read_lock_bh(&lgr->conns_lock); 729 conns = RB_EMPTY_ROOT(&lgr->conns_all); 730 read_unlock_bh(&lgr->conns_lock); 731 if (!conns) { /* number of lgr connections is no longer zero */ 732 spin_unlock_bh(lgr_lock); 733 return; 734 } 735 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 736 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 737 spin_unlock_bh(lgr_lock); 738 cancel_delayed_work(&lgr->free_work); 739 740 if (!lgr->is_smcd && !lgr->terminating) 741 smc_llc_send_link_delete_all(lgr, true, 742 SMC_LLC_DEL_PROG_INIT_TERM); 743 if (lgr->is_smcd && !lgr->terminating) 744 smc_ism_signal_shutdown(lgr); 745 if (!lgr->is_smcd) 746 smcr_lgr_link_deactivate_all(lgr); 747 smc_lgr_free(lgr); 748 } 749 750 static void smc_lgr_terminate_work(struct work_struct *work) 751 { 752 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 753 terminate_work); 754 755 __smc_lgr_terminate(lgr, true); 756 } 757 758 /* return next unique link id for the lgr */ 759 static u8 smcr_next_link_id(struct smc_link_group *lgr) 760 { 761 u8 link_id; 762 int i; 763 764 while (1) { 765 again: 766 link_id = ++lgr->next_link_id; 767 if (!link_id) /* skip zero as link_id */ 768 link_id = ++lgr->next_link_id; 769 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 770 if (smc_link_usable(&lgr->lnk[i]) && 771 lgr->lnk[i].link_id == link_id) 772 goto again; 773 } 774 break; 775 } 776 return link_id; 777 } 778 779 static void smcr_copy_dev_info_to_link(struct smc_link *link) 780 { 781 struct smc_ib_device *smcibdev = link->smcibdev; 782 783 snprintf(link->ibname, sizeof(link->ibname), "%s", 784 smcibdev->ibdev->name); 785 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; 786 } 787 788 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 789 u8 link_idx, struct smc_init_info *ini) 790 { 791 struct smc_ib_device *smcibdev; 792 u8 rndvec[3]; 793 int rc; 794 795 if (lgr->smc_version == SMC_V2) { 796 lnk->smcibdev = ini->smcrv2.ib_dev_v2; 797 lnk->ibport = ini->smcrv2.ib_port_v2; 798 } else { 799 lnk->smcibdev = ini->ib_dev; 800 lnk->ibport = ini->ib_port; 801 } 802 get_device(&lnk->smcibdev->ibdev->dev); 803 atomic_inc(&lnk->smcibdev->lnk_cnt); 804 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 805 lnk->clearing = 0; 806 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 807 lnk->link_id = smcr_next_link_id(lgr); 808 lnk->lgr = lgr; 809 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 810 lnk->link_idx = link_idx; 811 lnk->wr_rx_id_compl = 0; 812 smc_ibdev_cnt_inc(lnk); 813 smcr_copy_dev_info_to_link(lnk); 814 atomic_set(&lnk->conn_cnt, 0); 815 smc_llc_link_set_uid(lnk); 816 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 817 if (!lnk->smcibdev->initialized) { 818 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 819 if (rc) 820 goto out; 821 } 822 get_random_bytes(rndvec, sizeof(rndvec)); 823 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 824 (rndvec[2] << 16); 825 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 826 ini->vlan_id, lnk->gid, &lnk->sgid_index, 827 lgr->smc_version == SMC_V2 ? 828 &ini->smcrv2 : NULL); 829 if (rc) 830 goto out; 831 rc = smc_llc_link_init(lnk); 832 if (rc) 833 goto out; 834 rc = smc_wr_alloc_link_mem(lnk); 835 if (rc) 836 goto clear_llc_lnk; 837 rc = smc_ib_create_protection_domain(lnk); 838 if (rc) 839 goto free_link_mem; 840 rc = smc_ib_create_queue_pair(lnk); 841 if (rc) 842 goto dealloc_pd; 843 rc = smc_wr_create_link(lnk); 844 if (rc) 845 goto destroy_qp; 846 lnk->state = SMC_LNK_ACTIVATING; 847 return 0; 848 849 destroy_qp: 850 smc_ib_destroy_queue_pair(lnk); 851 dealloc_pd: 852 smc_ib_dealloc_protection_domain(lnk); 853 free_link_mem: 854 smc_wr_free_link_mem(lnk); 855 clear_llc_lnk: 856 smc_llc_link_clear(lnk, false); 857 out: 858 smc_ibdev_cnt_dec(lnk); 859 put_device(&lnk->smcibdev->ibdev->dev); 860 smcibdev = lnk->smcibdev; 861 memset(lnk, 0, sizeof(struct smc_link)); 862 lnk->state = SMC_LNK_UNUSED; 863 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 864 wake_up(&smcibdev->lnks_deleted); 865 smc_lgr_put(lgr); /* lgr_hold above */ 866 return rc; 867 } 868 869 /* create a new SMC link group */ 870 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 871 { 872 struct smc_link_group *lgr; 873 struct list_head *lgr_list; 874 struct smcd_dev *smcd; 875 struct smc_link *lnk; 876 spinlock_t *lgr_lock; 877 u8 link_idx; 878 int rc = 0; 879 int i; 880 881 if (ini->is_smcd && ini->vlan_id) { 882 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 883 ini->vlan_id)) { 884 rc = SMC_CLC_DECL_ISMVLANERR; 885 goto out; 886 } 887 } 888 889 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 890 if (!lgr) { 891 rc = SMC_CLC_DECL_MEM; 892 goto ism_put_vlan; 893 } 894 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 895 SMC_LGR_ID_SIZE, &lgr->id); 896 if (!lgr->tx_wq) { 897 rc = -ENOMEM; 898 goto free_lgr; 899 } 900 lgr->is_smcd = ini->is_smcd; 901 lgr->sync_err = 0; 902 lgr->terminating = 0; 903 lgr->freeing = 0; 904 lgr->vlan_id = ini->vlan_id; 905 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 906 init_rwsem(&lgr->sndbufs_lock); 907 init_rwsem(&lgr->rmbs_lock); 908 rwlock_init(&lgr->conns_lock); 909 for (i = 0; i < SMC_RMBE_SIZES; i++) { 910 INIT_LIST_HEAD(&lgr->sndbufs[i]); 911 INIT_LIST_HEAD(&lgr->rmbs[i]); 912 } 913 lgr->next_link_id = 0; 914 smc_lgr_list.num += SMC_LGR_NUM_INCR; 915 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 916 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 917 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 918 lgr->conns_all = RB_ROOT; 919 if (ini->is_smcd) { 920 /* SMC-D specific settings */ 921 smcd = ini->ism_dev[ini->ism_selected]; 922 get_device(smcd->ops->get_dev(smcd)); 923 lgr->peer_gid.gid = 924 ini->ism_peer_gid[ini->ism_selected].gid; 925 lgr->peer_gid.gid_ext = 926 ini->ism_peer_gid[ini->ism_selected].gid_ext; 927 lgr->smcd = ini->ism_dev[ini->ism_selected]; 928 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 929 lgr_lock = &lgr->smcd->lgr_lock; 930 lgr->smc_version = ini->smcd_version; 931 lgr->peer_shutdown = 0; 932 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 933 } else { 934 /* SMC-R specific settings */ 935 struct smc_ib_device *ibdev; 936 int ibport; 937 938 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 939 lgr->smc_version = ini->smcr_version; 940 memcpy(lgr->peer_systemid, ini->peer_systemid, 941 SMC_SYSTEMID_LEN); 942 if (lgr->smc_version == SMC_V2) { 943 ibdev = ini->smcrv2.ib_dev_v2; 944 ibport = ini->smcrv2.ib_port_v2; 945 lgr->saddr = ini->smcrv2.saddr; 946 lgr->uses_gateway = ini->smcrv2.uses_gateway; 947 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 948 ETH_ALEN); 949 lgr->max_conns = ini->max_conns; 950 lgr->max_links = ini->max_links; 951 } else { 952 ibdev = ini->ib_dev; 953 ibport = ini->ib_port; 954 lgr->max_conns = SMC_CONN_PER_LGR_MAX; 955 lgr->max_links = SMC_LINKS_ADD_LNK_MAX; 956 } 957 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 958 SMC_MAX_PNETID_LEN); 959 rc = smc_wr_alloc_lgr_mem(lgr); 960 if (rc) 961 goto free_wq; 962 smc_llc_lgr_init(lgr, smc); 963 964 link_idx = SMC_SINGLE_LINK; 965 lnk = &lgr->lnk[link_idx]; 966 rc = smcr_link_init(lgr, lnk, link_idx, ini); 967 if (rc) { 968 smc_wr_free_lgr_mem(lgr); 969 goto free_wq; 970 } 971 lgr->net = smc_ib_net(lnk->smcibdev); 972 lgr_list = &smc_lgr_list.list; 973 lgr_lock = &smc_lgr_list.lock; 974 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 975 atomic_inc(&lgr_cnt); 976 } 977 smc->conn.lgr = lgr; 978 spin_lock_bh(lgr_lock); 979 list_add_tail(&lgr->list, lgr_list); 980 spin_unlock_bh(lgr_lock); 981 return 0; 982 983 free_wq: 984 destroy_workqueue(lgr->tx_wq); 985 free_lgr: 986 kfree(lgr); 987 ism_put_vlan: 988 if (ini->is_smcd && ini->vlan_id) 989 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 990 out: 991 if (rc < 0) { 992 if (rc == -ENOMEM) 993 rc = SMC_CLC_DECL_MEM; 994 else 995 rc = SMC_CLC_DECL_INTERR; 996 } 997 return rc; 998 } 999 1000 static int smc_write_space(struct smc_connection *conn) 1001 { 1002 int buffer_len = conn->peer_rmbe_size; 1003 union smc_host_cursor prod; 1004 union smc_host_cursor cons; 1005 int space; 1006 1007 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 1008 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 1009 /* determine rx_buf space */ 1010 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 1011 return space; 1012 } 1013 1014 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 1015 struct smc_wr_buf *wr_buf) 1016 { 1017 struct smc_connection *conn = &smc->conn; 1018 union smc_host_cursor cons, fin; 1019 int rc = 0; 1020 int diff; 1021 1022 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 1023 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 1024 /* set prod cursor to old state, enforce tx_rdma_writes() */ 1025 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 1026 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 1027 1028 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 1029 /* cons cursor advanced more than fin, and prod was set 1030 * fin above, so now prod is smaller than cons. Fix that. 1031 */ 1032 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 1033 smc_curs_add(conn->sndbuf_desc->len, 1034 &conn->tx_curs_sent, diff); 1035 smc_curs_add(conn->sndbuf_desc->len, 1036 &conn->tx_curs_fin, diff); 1037 1038 smp_mb__before_atomic(); 1039 atomic_add(diff, &conn->sndbuf_space); 1040 smp_mb__after_atomic(); 1041 1042 smc_curs_add(conn->peer_rmbe_size, 1043 &conn->local_tx_ctrl.prod, diff); 1044 smc_curs_add(conn->peer_rmbe_size, 1045 &conn->local_tx_ctrl_fin, diff); 1046 } 1047 /* recalculate, value is used by tx_rdma_writes() */ 1048 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 1049 1050 if (smc->sk.sk_state != SMC_INIT && 1051 smc->sk.sk_state != SMC_CLOSED) { 1052 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 1053 if (!rc) { 1054 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 1055 smc->sk.sk_data_ready(&smc->sk); 1056 } 1057 } else { 1058 smc_wr_tx_put_slot(conn->lnk, 1059 (struct smc_wr_tx_pend_priv *)pend); 1060 } 1061 return rc; 1062 } 1063 1064 void smc_switch_link_and_count(struct smc_connection *conn, 1065 struct smc_link *to_lnk) 1066 { 1067 atomic_dec(&conn->lnk->conn_cnt); 1068 /* link_hold in smc_conn_create() */ 1069 smcr_link_put(conn->lnk); 1070 conn->lnk = to_lnk; 1071 atomic_inc(&conn->lnk->conn_cnt); 1072 /* link_put in smc_conn_free() */ 1073 smcr_link_hold(conn->lnk); 1074 } 1075 1076 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1077 struct smc_link *from_lnk, bool is_dev_err) 1078 { 1079 struct smc_link *to_lnk = NULL; 1080 struct smc_cdc_tx_pend *pend; 1081 struct smc_connection *conn; 1082 struct smc_wr_buf *wr_buf; 1083 struct smc_sock *smc; 1084 struct rb_node *node; 1085 int i, rc = 0; 1086 1087 /* link is inactive, wake up tx waiters */ 1088 smc_wr_wakeup_tx_wait(from_lnk); 1089 1090 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1091 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1092 continue; 1093 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1094 from_lnk->ibport == lgr->lnk[i].ibport) { 1095 continue; 1096 } 1097 to_lnk = &lgr->lnk[i]; 1098 break; 1099 } 1100 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1101 smc_lgr_terminate_sched(lgr); 1102 return NULL; 1103 } 1104 again: 1105 read_lock_bh(&lgr->conns_lock); 1106 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1107 conn = rb_entry(node, struct smc_connection, alert_node); 1108 if (conn->lnk != from_lnk) 1109 continue; 1110 smc = container_of(conn, struct smc_sock, conn); 1111 /* conn->lnk not yet set in SMC_INIT state */ 1112 if (smc->sk.sk_state == SMC_INIT) 1113 continue; 1114 if (smc->sk.sk_state == SMC_CLOSED || 1115 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1116 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1117 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1118 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1119 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1120 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1121 smc->sk.sk_state == SMC_PEERABORTWAIT || 1122 smc->sk.sk_state == SMC_PROCESSABORT) { 1123 spin_lock_bh(&conn->send_lock); 1124 smc_switch_link_and_count(conn, to_lnk); 1125 spin_unlock_bh(&conn->send_lock); 1126 continue; 1127 } 1128 sock_hold(&smc->sk); 1129 read_unlock_bh(&lgr->conns_lock); 1130 /* pre-fetch buffer outside of send_lock, might sleep */ 1131 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1132 if (rc) 1133 goto err_out; 1134 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1135 spin_lock_bh(&conn->send_lock); 1136 smc_switch_link_and_count(conn, to_lnk); 1137 rc = smc_switch_cursor(smc, pend, wr_buf); 1138 spin_unlock_bh(&conn->send_lock); 1139 sock_put(&smc->sk); 1140 if (rc) 1141 goto err_out; 1142 goto again; 1143 } 1144 read_unlock_bh(&lgr->conns_lock); 1145 smc_wr_tx_link_put(to_lnk); 1146 return to_lnk; 1147 1148 err_out: 1149 smcr_link_down_cond_sched(to_lnk); 1150 smc_wr_tx_link_put(to_lnk); 1151 return NULL; 1152 } 1153 1154 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1155 struct smc_link_group *lgr) 1156 { 1157 struct rw_semaphore *lock; /* lock buffer list */ 1158 int rc; 1159 1160 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1161 /* unregister rmb with peer */ 1162 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1163 if (!rc) { 1164 /* protect against smc_llc_cli_rkey_exchange() */ 1165 down_read(&lgr->llc_conf_mutex); 1166 smc_llc_do_delete_rkey(lgr, buf_desc); 1167 buf_desc->is_conf_rkey = false; 1168 up_read(&lgr->llc_conf_mutex); 1169 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1170 } 1171 } 1172 1173 if (buf_desc->is_reg_err) { 1174 /* buf registration failed, reuse not possible */ 1175 lock = is_rmb ? &lgr->rmbs_lock : 1176 &lgr->sndbufs_lock; 1177 down_write(lock); 1178 smc_lgr_buf_list_del(lgr, is_rmb, buf_desc); 1179 up_write(lock); 1180 1181 smc_buf_free(lgr, is_rmb, buf_desc); 1182 } else { 1183 /* memzero_explicit provides potential memory barrier semantics */ 1184 memzero_explicit(buf_desc->cpu_addr, buf_desc->len); 1185 WRITE_ONCE(buf_desc->used, 0); 1186 } 1187 } 1188 1189 static void smcd_buf_detach(struct smc_connection *conn) 1190 { 1191 struct smcd_dev *smcd = conn->lgr->smcd; 1192 u64 peer_token = conn->peer_token; 1193 1194 if (!conn->sndbuf_desc) 1195 return; 1196 1197 smc_ism_detach_dmb(smcd, peer_token); 1198 1199 kfree(conn->sndbuf_desc); 1200 conn->sndbuf_desc = NULL; 1201 } 1202 1203 static void smc_buf_unuse(struct smc_connection *conn, 1204 struct smc_link_group *lgr) 1205 { 1206 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1207 bool is_smcd = lgr->is_smcd; 1208 int bufsize; 1209 1210 if (conn->sndbuf_desc) { 1211 bufsize = conn->sndbuf_desc->len; 1212 if (!is_smcd && conn->sndbuf_desc->is_vm) { 1213 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1214 } else { 1215 memzero_explicit(conn->sndbuf_desc->cpu_addr, bufsize); 1216 WRITE_ONCE(conn->sndbuf_desc->used, 0); 1217 } 1218 SMC_STAT_RMB_SIZE(smc, is_smcd, false, false, bufsize); 1219 } 1220 if (conn->rmb_desc) { 1221 bufsize = conn->rmb_desc->len; 1222 if (!is_smcd) { 1223 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1224 } else { 1225 bufsize += sizeof(struct smcd_cdc_msg); 1226 memzero_explicit(conn->rmb_desc->cpu_addr, bufsize); 1227 WRITE_ONCE(conn->rmb_desc->used, 0); 1228 } 1229 SMC_STAT_RMB_SIZE(smc, is_smcd, true, false, bufsize); 1230 } 1231 } 1232 1233 /* remove a finished connection from its link group */ 1234 void smc_conn_free(struct smc_connection *conn) 1235 { 1236 struct smc_link_group *lgr = conn->lgr; 1237 1238 if (!lgr || conn->freed) 1239 /* Connection has never been registered in a 1240 * link group, or has already been freed. 1241 */ 1242 return; 1243 1244 conn->freed = 1; 1245 if (!smc_conn_lgr_valid(conn)) 1246 /* Connection has already unregistered from 1247 * link group. 1248 */ 1249 goto lgr_put; 1250 1251 if (lgr->is_smcd) { 1252 if (!list_empty(&lgr->list)) 1253 smc_ism_unset_conn(conn); 1254 if (smc_ism_support_dmb_nocopy(lgr->smcd)) 1255 smcd_buf_detach(conn); 1256 tasklet_kill(&conn->rx_tsklet); 1257 } else { 1258 smc_cdc_wait_pend_tx_wr(conn); 1259 if (current_work() != &conn->abort_work) 1260 cancel_work_sync(&conn->abort_work); 1261 } 1262 if (!list_empty(&lgr->list)) { 1263 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1264 smc_lgr_unregister_conn(conn); 1265 } 1266 1267 if (!lgr->conns_num) 1268 smc_lgr_schedule_free_work(lgr); 1269 lgr_put: 1270 if (!lgr->is_smcd) 1271 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1272 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1273 } 1274 1275 /* unregister a link from a buf_desc */ 1276 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1277 struct smc_link *lnk) 1278 { 1279 if (is_rmb || buf_desc->is_vm) 1280 buf_desc->is_reg_mr[lnk->link_idx] = false; 1281 if (!buf_desc->is_map_ib[lnk->link_idx]) 1282 return; 1283 1284 if ((is_rmb || buf_desc->is_vm) && 1285 buf_desc->mr[lnk->link_idx]) { 1286 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1287 buf_desc->mr[lnk->link_idx] = NULL; 1288 } 1289 if (is_rmb) 1290 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1291 else 1292 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1293 1294 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1295 buf_desc->is_map_ib[lnk->link_idx] = false; 1296 } 1297 1298 /* unmap all buffers of lgr for a deleted link */ 1299 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1300 { 1301 struct smc_link_group *lgr = lnk->lgr; 1302 struct smc_buf_desc *buf_desc, *bf; 1303 int i; 1304 1305 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1306 down_write(&lgr->rmbs_lock); 1307 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1308 smcr_buf_unmap_link(buf_desc, true, lnk); 1309 up_write(&lgr->rmbs_lock); 1310 1311 down_write(&lgr->sndbufs_lock); 1312 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1313 list) 1314 smcr_buf_unmap_link(buf_desc, false, lnk); 1315 up_write(&lgr->sndbufs_lock); 1316 } 1317 } 1318 1319 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1320 { 1321 struct smc_link_group *lgr = lnk->lgr; 1322 int i; 1323 1324 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1325 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1326 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1327 } 1328 } 1329 1330 static void __smcr_link_clear(struct smc_link *lnk) 1331 { 1332 struct smc_link_group *lgr = lnk->lgr; 1333 struct smc_ib_device *smcibdev; 1334 1335 smc_wr_free_link_mem(lnk); 1336 smc_ibdev_cnt_dec(lnk); 1337 put_device(&lnk->smcibdev->ibdev->dev); 1338 smcibdev = lnk->smcibdev; 1339 memset(lnk, 0, sizeof(struct smc_link)); 1340 lnk->state = SMC_LNK_UNUSED; 1341 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1342 wake_up(&smcibdev->lnks_deleted); 1343 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1344 } 1345 1346 /* must be called under lgr->llc_conf_mutex lock */ 1347 void smcr_link_clear(struct smc_link *lnk, bool log) 1348 { 1349 if (!lnk->lgr || lnk->clearing || 1350 lnk->state == SMC_LNK_UNUSED) 1351 return; 1352 lnk->clearing = 1; 1353 lnk->peer_qpn = 0; 1354 smc_llc_link_clear(lnk, log); 1355 smcr_buf_unmap_lgr(lnk); 1356 smcr_rtoken_clear_link(lnk); 1357 smc_ib_modify_qp_error(lnk); 1358 smc_wr_free_link(lnk); 1359 smc_ib_destroy_queue_pair(lnk); 1360 smc_ib_dealloc_protection_domain(lnk); 1361 smcr_link_put(lnk); /* theoretically last link_put */ 1362 } 1363 1364 void smcr_link_hold(struct smc_link *lnk) 1365 { 1366 refcount_inc(&lnk->refcnt); 1367 } 1368 1369 void smcr_link_put(struct smc_link *lnk) 1370 { 1371 if (refcount_dec_and_test(&lnk->refcnt)) 1372 __smcr_link_clear(lnk); 1373 } 1374 1375 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1376 struct smc_buf_desc *buf_desc) 1377 { 1378 int i; 1379 1380 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1381 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1382 1383 if (!buf_desc->is_vm && buf_desc->pages) 1384 __free_pages(buf_desc->pages, buf_desc->order); 1385 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1386 vfree(buf_desc->cpu_addr); 1387 kfree(buf_desc); 1388 } 1389 1390 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1391 struct smc_buf_desc *buf_desc) 1392 { 1393 if (is_dmb) { 1394 /* restore original buf len */ 1395 buf_desc->len += sizeof(struct smcd_cdc_msg); 1396 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1397 } else { 1398 kfree(buf_desc->cpu_addr); 1399 } 1400 kfree(buf_desc); 1401 } 1402 1403 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1404 struct smc_buf_desc *buf_desc) 1405 { 1406 if (lgr->is_smcd) 1407 smcd_buf_free(lgr, is_rmb, buf_desc); 1408 else 1409 smcr_buf_free(lgr, is_rmb, buf_desc); 1410 } 1411 1412 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1413 { 1414 struct smc_buf_desc *buf_desc, *bf_desc; 1415 struct list_head *buf_list; 1416 int i; 1417 1418 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1419 if (is_rmb) 1420 buf_list = &lgr->rmbs[i]; 1421 else 1422 buf_list = &lgr->sndbufs[i]; 1423 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1424 list) { 1425 smc_lgr_buf_list_del(lgr, is_rmb, buf_desc); 1426 smc_buf_free(lgr, is_rmb, buf_desc); 1427 } 1428 } 1429 } 1430 1431 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1432 { 1433 /* free send buffers */ 1434 __smc_lgr_free_bufs(lgr, false); 1435 /* free rmbs */ 1436 __smc_lgr_free_bufs(lgr, true); 1437 } 1438 1439 /* won't be freed until no one accesses to lgr anymore */ 1440 static void __smc_lgr_free(struct smc_link_group *lgr) 1441 { 1442 smc_lgr_free_bufs(lgr); 1443 if (lgr->is_smcd) { 1444 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1445 wake_up(&lgr->smcd->lgrs_deleted); 1446 } else { 1447 smc_wr_free_lgr_mem(lgr); 1448 if (!atomic_dec_return(&lgr_cnt)) 1449 wake_up(&lgrs_deleted); 1450 } 1451 kfree(lgr); 1452 } 1453 1454 /* remove a link group */ 1455 static void smc_lgr_free(struct smc_link_group *lgr) 1456 { 1457 int i; 1458 1459 if (!lgr->is_smcd) { 1460 down_write(&lgr->llc_conf_mutex); 1461 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1462 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1463 smcr_link_clear(&lgr->lnk[i], false); 1464 } 1465 up_write(&lgr->llc_conf_mutex); 1466 smc_llc_lgr_clear(lgr); 1467 } 1468 1469 destroy_workqueue(lgr->tx_wq); 1470 if (lgr->is_smcd) { 1471 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1472 put_device(lgr->smcd->ops->get_dev(lgr->smcd)); 1473 } 1474 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1475 } 1476 1477 void smc_lgr_hold(struct smc_link_group *lgr) 1478 { 1479 refcount_inc(&lgr->refcnt); 1480 } 1481 1482 void smc_lgr_put(struct smc_link_group *lgr) 1483 { 1484 if (refcount_dec_and_test(&lgr->refcnt)) 1485 __smc_lgr_free(lgr); 1486 } 1487 1488 static void smc_sk_wake_ups(struct smc_sock *smc) 1489 { 1490 smc->sk.sk_write_space(&smc->sk); 1491 smc->sk.sk_data_ready(&smc->sk); 1492 smc->sk.sk_state_change(&smc->sk); 1493 } 1494 1495 /* kill a connection */ 1496 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1497 { 1498 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1499 1500 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1501 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1502 else 1503 smc_close_abort(conn); 1504 conn->killed = 1; 1505 smc->sk.sk_err = ECONNABORTED; 1506 smc_sk_wake_ups(smc); 1507 if (conn->lgr->is_smcd) { 1508 smc_ism_unset_conn(conn); 1509 if (smc_ism_support_dmb_nocopy(conn->lgr->smcd)) 1510 smcd_buf_detach(conn); 1511 if (soft) 1512 tasklet_kill(&conn->rx_tsklet); 1513 else 1514 tasklet_unlock_wait(&conn->rx_tsklet); 1515 } else { 1516 smc_cdc_wait_pend_tx_wr(conn); 1517 } 1518 smc_lgr_unregister_conn(conn); 1519 smc_close_active_abort(smc); 1520 } 1521 1522 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1523 { 1524 if (lgr->is_smcd) { 1525 smc_ism_signal_shutdown(lgr); 1526 } else { 1527 u32 rsn = lgr->llc_termination_rsn; 1528 1529 if (!rsn) 1530 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1531 smc_llc_send_link_delete_all(lgr, false, rsn); 1532 smcr_lgr_link_deactivate_all(lgr); 1533 } 1534 } 1535 1536 /* terminate link group 1537 * @soft: true if link group shutdown can take its time 1538 * false if immediate link group shutdown is required 1539 */ 1540 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1541 { 1542 struct smc_connection *conn; 1543 struct smc_sock *smc; 1544 struct rb_node *node; 1545 1546 if (lgr->terminating) 1547 return; /* lgr already terminating */ 1548 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1549 cancel_delayed_work(&lgr->free_work); 1550 lgr->terminating = 1; 1551 1552 /* kill remaining link group connections */ 1553 read_lock_bh(&lgr->conns_lock); 1554 node = rb_first(&lgr->conns_all); 1555 while (node) { 1556 read_unlock_bh(&lgr->conns_lock); 1557 conn = rb_entry(node, struct smc_connection, alert_node); 1558 smc = container_of(conn, struct smc_sock, conn); 1559 sock_hold(&smc->sk); /* sock_put below */ 1560 lock_sock(&smc->sk); 1561 smc_conn_kill(conn, soft); 1562 release_sock(&smc->sk); 1563 sock_put(&smc->sk); /* sock_hold above */ 1564 read_lock_bh(&lgr->conns_lock); 1565 node = rb_first(&lgr->conns_all); 1566 } 1567 read_unlock_bh(&lgr->conns_lock); 1568 smc_lgr_cleanup(lgr); 1569 smc_lgr_free(lgr); 1570 } 1571 1572 /* unlink link group and schedule termination */ 1573 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1574 { 1575 spinlock_t *lgr_lock; 1576 1577 smc_lgr_list_head(lgr, &lgr_lock); 1578 spin_lock_bh(lgr_lock); 1579 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1580 spin_unlock_bh(lgr_lock); 1581 return; /* lgr already terminating */ 1582 } 1583 list_del_init(&lgr->list); 1584 lgr->freeing = 1; 1585 spin_unlock_bh(lgr_lock); 1586 schedule_work(&lgr->terminate_work); 1587 } 1588 1589 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1590 void smc_smcd_terminate(struct smcd_dev *dev, struct smcd_gid *peer_gid, 1591 unsigned short vlan) 1592 { 1593 struct smc_link_group *lgr, *l; 1594 LIST_HEAD(lgr_free_list); 1595 1596 /* run common cleanup function and build free list */ 1597 spin_lock_bh(&dev->lgr_lock); 1598 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1599 if ((!peer_gid->gid || 1600 (lgr->peer_gid.gid == peer_gid->gid && 1601 !smc_ism_is_emulated(dev) ? 1 : 1602 lgr->peer_gid.gid_ext == peer_gid->gid_ext)) && 1603 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1604 if (peer_gid->gid) /* peer triggered termination */ 1605 lgr->peer_shutdown = 1; 1606 list_move(&lgr->list, &lgr_free_list); 1607 lgr->freeing = 1; 1608 } 1609 } 1610 spin_unlock_bh(&dev->lgr_lock); 1611 1612 /* cancel the regular free workers and actually free lgrs */ 1613 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1614 list_del_init(&lgr->list); 1615 schedule_work(&lgr->terminate_work); 1616 } 1617 } 1618 1619 /* Called when an SMCD device is removed or the smc module is unloaded */ 1620 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1621 { 1622 struct smc_link_group *lgr, *lg; 1623 LIST_HEAD(lgr_free_list); 1624 1625 spin_lock_bh(&smcd->lgr_lock); 1626 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1627 list_for_each_entry(lgr, &lgr_free_list, list) 1628 lgr->freeing = 1; 1629 spin_unlock_bh(&smcd->lgr_lock); 1630 1631 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1632 list_del_init(&lgr->list); 1633 __smc_lgr_terminate(lgr, false); 1634 } 1635 1636 if (atomic_read(&smcd->lgr_cnt)) 1637 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1638 } 1639 1640 /* Called when an SMCR device is removed or the smc module is unloaded. 1641 * If smcibdev is given, all SMCR link groups using this device are terminated. 1642 * If smcibdev is NULL, all SMCR link groups are terminated. 1643 */ 1644 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1645 { 1646 struct smc_link_group *lgr, *lg; 1647 LIST_HEAD(lgr_free_list); 1648 int i; 1649 1650 spin_lock_bh(&smc_lgr_list.lock); 1651 if (!smcibdev) { 1652 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1653 list_for_each_entry(lgr, &lgr_free_list, list) 1654 lgr->freeing = 1; 1655 } else { 1656 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1657 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1658 if (lgr->lnk[i].smcibdev == smcibdev) 1659 smcr_link_down_cond_sched(&lgr->lnk[i]); 1660 } 1661 } 1662 } 1663 spin_unlock_bh(&smc_lgr_list.lock); 1664 1665 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1666 list_del_init(&lgr->list); 1667 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1668 __smc_lgr_terminate(lgr, false); 1669 } 1670 1671 if (smcibdev) { 1672 if (atomic_read(&smcibdev->lnk_cnt)) 1673 wait_event(smcibdev->lnks_deleted, 1674 !atomic_read(&smcibdev->lnk_cnt)); 1675 } else { 1676 if (atomic_read(&lgr_cnt)) 1677 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1678 } 1679 } 1680 1681 /* set new lgr type and clear all asymmetric link tagging */ 1682 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1683 { 1684 char *lgr_type = ""; 1685 int i; 1686 1687 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1688 if (smc_link_usable(&lgr->lnk[i])) 1689 lgr->lnk[i].link_is_asym = false; 1690 if (lgr->type == new_type) 1691 return; 1692 lgr->type = new_type; 1693 1694 switch (lgr->type) { 1695 case SMC_LGR_NONE: 1696 lgr_type = "NONE"; 1697 break; 1698 case SMC_LGR_SINGLE: 1699 lgr_type = "SINGLE"; 1700 break; 1701 case SMC_LGR_SYMMETRIC: 1702 lgr_type = "SYMMETRIC"; 1703 break; 1704 case SMC_LGR_ASYMMETRIC_PEER: 1705 lgr_type = "ASYMMETRIC_PEER"; 1706 break; 1707 case SMC_LGR_ASYMMETRIC_LOCAL: 1708 lgr_type = "ASYMMETRIC_LOCAL"; 1709 break; 1710 } 1711 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1712 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1713 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1714 } 1715 1716 /* set new lgr type and tag a link as asymmetric */ 1717 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1718 enum smc_lgr_type new_type, int asym_lnk_idx) 1719 { 1720 smcr_lgr_set_type(lgr, new_type); 1721 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1722 } 1723 1724 /* abort connection, abort_work scheduled from tasklet context */ 1725 static void smc_conn_abort_work(struct work_struct *work) 1726 { 1727 struct smc_connection *conn = container_of(work, 1728 struct smc_connection, 1729 abort_work); 1730 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1731 1732 lock_sock(&smc->sk); 1733 smc_conn_kill(conn, true); 1734 release_sock(&smc->sk); 1735 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1736 } 1737 1738 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1739 { 1740 struct smc_link_group *lgr, *n; 1741 1742 spin_lock_bh(&smc_lgr_list.lock); 1743 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1744 struct smc_link *link; 1745 1746 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1747 SMC_MAX_PNETID_LEN) || 1748 lgr->type == SMC_LGR_SYMMETRIC || 1749 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1750 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1751 continue; 1752 1753 if (lgr->type == SMC_LGR_SINGLE && lgr->max_links <= 1) 1754 continue; 1755 1756 /* trigger local add link processing */ 1757 link = smc_llc_usable_link(lgr); 1758 if (link) 1759 smc_llc_add_link_local(link); 1760 } 1761 spin_unlock_bh(&smc_lgr_list.lock); 1762 } 1763 1764 /* link is down - switch connections to alternate link, 1765 * must be called under lgr->llc_conf_mutex lock 1766 */ 1767 static void smcr_link_down(struct smc_link *lnk) 1768 { 1769 struct smc_link_group *lgr = lnk->lgr; 1770 struct smc_link *to_lnk; 1771 int del_link_id; 1772 1773 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1774 return; 1775 1776 to_lnk = smc_switch_conns(lgr, lnk, true); 1777 if (!to_lnk) { /* no backup link available */ 1778 smcr_link_clear(lnk, true); 1779 return; 1780 } 1781 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1782 del_link_id = lnk->link_id; 1783 1784 if (lgr->role == SMC_SERV) { 1785 /* trigger local delete link processing */ 1786 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1787 } else { 1788 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1789 /* another llc task is ongoing */ 1790 up_write(&lgr->llc_conf_mutex); 1791 wait_event_timeout(lgr->llc_flow_waiter, 1792 (list_empty(&lgr->list) || 1793 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1794 SMC_LLC_WAIT_TIME); 1795 down_write(&lgr->llc_conf_mutex); 1796 } 1797 if (!list_empty(&lgr->list)) { 1798 smc_llc_send_delete_link(to_lnk, del_link_id, 1799 SMC_LLC_REQ, true, 1800 SMC_LLC_DEL_LOST_PATH); 1801 smcr_link_clear(lnk, true); 1802 } 1803 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1804 } 1805 } 1806 1807 /* must be called under lgr->llc_conf_mutex lock */ 1808 void smcr_link_down_cond(struct smc_link *lnk) 1809 { 1810 if (smc_link_downing(&lnk->state)) { 1811 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1812 smcr_link_down(lnk); 1813 } 1814 } 1815 1816 /* will get the lgr->llc_conf_mutex lock */ 1817 void smcr_link_down_cond_sched(struct smc_link *lnk) 1818 { 1819 if (smc_link_downing(&lnk->state)) { 1820 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1821 schedule_work(&lnk->link_down_wrk); 1822 } 1823 } 1824 1825 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1826 { 1827 struct smc_link_group *lgr, *n; 1828 int i; 1829 1830 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1831 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1832 SMC_MAX_PNETID_LEN)) 1833 continue; /* lgr is not affected */ 1834 if (list_empty(&lgr->list)) 1835 continue; 1836 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1837 struct smc_link *lnk = &lgr->lnk[i]; 1838 1839 if (smc_link_usable(lnk) && 1840 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1841 smcr_link_down_cond_sched(lnk); 1842 } 1843 } 1844 } 1845 1846 static void smc_link_down_work(struct work_struct *work) 1847 { 1848 struct smc_link *link = container_of(work, struct smc_link, 1849 link_down_wrk); 1850 struct smc_link_group *lgr = link->lgr; 1851 1852 if (list_empty(&lgr->list)) 1853 return; 1854 wake_up_all(&lgr->llc_msg_waiter); 1855 down_write(&lgr->llc_conf_mutex); 1856 smcr_link_down(link); 1857 up_write(&lgr->llc_conf_mutex); 1858 } 1859 1860 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1861 struct netdev_nested_priv *priv) 1862 { 1863 unsigned short *vlan_id = (unsigned short *)priv->data; 1864 1865 if (is_vlan_dev(lower_dev)) { 1866 *vlan_id = vlan_dev_vlan_id(lower_dev); 1867 return 1; 1868 } 1869 1870 return 0; 1871 } 1872 1873 /* Determine vlan of internal TCP socket. */ 1874 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1875 { 1876 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1877 struct netdev_nested_priv priv; 1878 struct net_device *ndev; 1879 int rc = 0; 1880 1881 ini->vlan_id = 0; 1882 if (!dst) { 1883 rc = -ENOTCONN; 1884 goto out; 1885 } 1886 if (!dst->dev) { 1887 rc = -ENODEV; 1888 goto out_rel; 1889 } 1890 1891 ndev = dst->dev; 1892 if (is_vlan_dev(ndev)) { 1893 ini->vlan_id = vlan_dev_vlan_id(ndev); 1894 goto out_rel; 1895 } 1896 1897 priv.data = (void *)&ini->vlan_id; 1898 rtnl_lock(); 1899 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1900 rtnl_unlock(); 1901 1902 out_rel: 1903 dst_release(dst); 1904 out: 1905 return rc; 1906 } 1907 1908 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1909 u8 peer_systemid[], 1910 u8 peer_gid[], 1911 u8 peer_mac_v1[], 1912 enum smc_lgr_role role, u32 clcqpn, 1913 struct net *net) 1914 { 1915 struct smc_link *lnk; 1916 int i; 1917 1918 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1919 lgr->role != role) 1920 return false; 1921 1922 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1923 lnk = &lgr->lnk[i]; 1924 1925 if (!smc_link_active(lnk)) 1926 continue; 1927 /* use verbs API to check netns, instead of lgr->net */ 1928 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1929 return false; 1930 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1931 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1932 (smcr_version == SMC_V2 || 1933 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1934 return true; 1935 } 1936 return false; 1937 } 1938 1939 static bool smcd_lgr_match(struct smc_link_group *lgr, 1940 struct smcd_dev *smcismdev, 1941 struct smcd_gid *peer_gid) 1942 { 1943 if (lgr->peer_gid.gid != peer_gid->gid || 1944 lgr->smcd != smcismdev) 1945 return false; 1946 1947 if (smc_ism_is_emulated(smcismdev) && 1948 lgr->peer_gid.gid_ext != peer_gid->gid_ext) 1949 return false; 1950 1951 return true; 1952 } 1953 1954 /* create a new SMC connection (and a new link group if necessary) */ 1955 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1956 { 1957 struct smc_connection *conn = &smc->conn; 1958 struct net *net = sock_net(&smc->sk); 1959 struct list_head *lgr_list; 1960 struct smc_link_group *lgr; 1961 enum smc_lgr_role role; 1962 spinlock_t *lgr_lock; 1963 int rc = 0; 1964 1965 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1966 &smc_lgr_list.list; 1967 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1968 &smc_lgr_list.lock; 1969 ini->first_contact_local = 1; 1970 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1971 if (role == SMC_CLNT && ini->first_contact_peer) 1972 /* create new link group as well */ 1973 goto create; 1974 1975 /* determine if an existing link group can be reused */ 1976 spin_lock_bh(lgr_lock); 1977 list_for_each_entry(lgr, lgr_list, list) { 1978 write_lock_bh(&lgr->conns_lock); 1979 if ((ini->is_smcd ? 1980 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1981 &ini->ism_peer_gid[ini->ism_selected]) : 1982 smcr_lgr_match(lgr, ini->smcr_version, 1983 ini->peer_systemid, 1984 ini->peer_gid, ini->peer_mac, role, 1985 ini->ib_clcqpn, net)) && 1986 !lgr->sync_err && 1987 (ini->smcd_version == SMC_V2 || 1988 lgr->vlan_id == ini->vlan_id) && 1989 (role == SMC_CLNT || ini->is_smcd || 1990 (lgr->conns_num < lgr->max_conns && 1991 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1992 /* link group found */ 1993 ini->first_contact_local = 0; 1994 conn->lgr = lgr; 1995 rc = smc_lgr_register_conn(conn, false); 1996 write_unlock_bh(&lgr->conns_lock); 1997 if (!rc && delayed_work_pending(&lgr->free_work)) 1998 cancel_delayed_work(&lgr->free_work); 1999 break; 2000 } 2001 write_unlock_bh(&lgr->conns_lock); 2002 } 2003 spin_unlock_bh(lgr_lock); 2004 if (rc) 2005 return rc; 2006 2007 if (role == SMC_CLNT && !ini->first_contact_peer && 2008 ini->first_contact_local) { 2009 /* Server reuses a link group, but Client wants to start 2010 * a new one 2011 * send out_of_sync decline, reason synchr. error 2012 */ 2013 return SMC_CLC_DECL_SYNCERR; 2014 } 2015 2016 create: 2017 if (ini->first_contact_local) { 2018 rc = smc_lgr_create(smc, ini); 2019 if (rc) 2020 goto out; 2021 lgr = conn->lgr; 2022 write_lock_bh(&lgr->conns_lock); 2023 rc = smc_lgr_register_conn(conn, true); 2024 write_unlock_bh(&lgr->conns_lock); 2025 if (rc) { 2026 smc_lgr_cleanup_early(lgr); 2027 goto out; 2028 } 2029 } 2030 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 2031 if (!conn->lgr->is_smcd) 2032 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 2033 conn->freed = 0; 2034 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 2035 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 2036 conn->urg_state = SMC_URG_READ; 2037 init_waitqueue_head(&conn->cdc_pend_tx_wq); 2038 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 2039 if (ini->is_smcd) { 2040 conn->rx_off = sizeof(struct smcd_cdc_msg); 2041 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 2042 } else { 2043 conn->rx_off = 0; 2044 } 2045 #ifndef KERNEL_HAS_ATOMIC64 2046 spin_lock_init(&conn->acurs_lock); 2047 #endif 2048 2049 out: 2050 return rc; 2051 } 2052 2053 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 2054 #define SMCR_RMBE_SIZES 15 /* 0 -> 16KB, 1 -> 32KB, .. 15 -> 512MB */ 2055 2056 /* convert the RMB size into the compressed notation (minimum 16K, see 2057 * SMCD/R_DMBE_SIZES. 2058 * In contrast to plain ilog2, this rounds towards the next power of 2, 2059 * so the socket application gets at least its desired sndbuf / rcvbuf size. 2060 */ 2061 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 2062 { 2063 u8 compressed; 2064 2065 if (size <= SMC_BUF_MIN_SIZE) 2066 return 0; 2067 2068 size = (size - 1) >> 14; /* convert to 16K multiple */ 2069 compressed = min_t(u8, ilog2(size) + 1, 2070 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 2071 2072 #ifdef CONFIG_ARCH_NO_SG_CHAIN 2073 if (!is_smcd && is_rmb) 2074 /* RMBs are backed by & limited to max size of scatterlists */ 2075 compressed = min_t(u8, compressed, ilog2((SG_MAX_SINGLE_ALLOC * PAGE_SIZE) >> 14)); 2076 #endif 2077 2078 return compressed; 2079 } 2080 2081 /* convert the RMB size from compressed notation into integer */ 2082 int smc_uncompress_bufsize(u8 compressed) 2083 { 2084 u32 size; 2085 2086 size = 0x00000001 << (((int)compressed) + 14); 2087 return (int)size; 2088 } 2089 2090 /* try to reuse a sndbuf or rmb description slot for a certain 2091 * buffer size; if not available, return NULL 2092 */ 2093 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 2094 struct rw_semaphore *lock, 2095 struct list_head *buf_list) 2096 { 2097 struct smc_buf_desc *buf_slot; 2098 2099 down_read(lock); 2100 list_for_each_entry(buf_slot, buf_list, list) { 2101 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 2102 up_read(lock); 2103 return buf_slot; 2104 } 2105 } 2106 up_read(lock); 2107 return NULL; 2108 } 2109 2110 /* one of the conditions for announcing a receiver's current window size is 2111 * that it "results in a minimum increase in the window size of 10% of the 2112 * receive buffer space" [RFC7609] 2113 */ 2114 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2115 { 2116 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2117 } 2118 2119 /* map an buf to a link */ 2120 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2121 struct smc_link *lnk) 2122 { 2123 int rc, i, nents, offset, buf_size, size, access_flags; 2124 struct scatterlist *sg; 2125 void *buf; 2126 2127 if (buf_desc->is_map_ib[lnk->link_idx]) 2128 return 0; 2129 2130 if (buf_desc->is_vm) { 2131 buf = buf_desc->cpu_addr; 2132 buf_size = buf_desc->len; 2133 offset = offset_in_page(buf_desc->cpu_addr); 2134 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2135 } else { 2136 nents = 1; 2137 } 2138 2139 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2140 if (rc) 2141 return rc; 2142 2143 if (buf_desc->is_vm) { 2144 /* virtually contiguous buffer */ 2145 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2146 size = min_t(int, PAGE_SIZE - offset, buf_size); 2147 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2148 buf += size / sizeof(*buf); 2149 buf_size -= size; 2150 offset = 0; 2151 } 2152 } else { 2153 /* physically contiguous buffer */ 2154 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2155 buf_desc->cpu_addr, buf_desc->len); 2156 } 2157 2158 /* map sg table to DMA address */ 2159 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2160 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2161 /* SMC protocol depends on mapping to one DMA address only */ 2162 if (rc != nents) { 2163 rc = -EAGAIN; 2164 goto free_table; 2165 } 2166 2167 buf_desc->is_dma_need_sync |= 2168 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2169 2170 if (is_rmb || buf_desc->is_vm) { 2171 /* create a new memory region for the RMB or vzalloced sndbuf */ 2172 access_flags = is_rmb ? 2173 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2174 IB_ACCESS_LOCAL_WRITE; 2175 2176 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2177 buf_desc, lnk->link_idx); 2178 if (rc) 2179 goto buf_unmap; 2180 smc_ib_sync_sg_for_device(lnk, buf_desc, 2181 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2182 } 2183 buf_desc->is_map_ib[lnk->link_idx] = true; 2184 return 0; 2185 2186 buf_unmap: 2187 smc_ib_buf_unmap_sg(lnk, buf_desc, 2188 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2189 free_table: 2190 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2191 return rc; 2192 } 2193 2194 /* register a new buf on IB device, rmb or vzalloced sndbuf 2195 * must be called under lgr->llc_conf_mutex lock 2196 */ 2197 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2198 { 2199 if (list_empty(&link->lgr->list)) 2200 return -ENOLINK; 2201 if (!buf_desc->is_reg_mr[link->link_idx]) { 2202 /* register memory region for new buf */ 2203 if (buf_desc->is_vm) 2204 buf_desc->mr[link->link_idx]->iova = 2205 (uintptr_t)buf_desc->cpu_addr; 2206 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2207 buf_desc->is_reg_err = true; 2208 return -EFAULT; 2209 } 2210 buf_desc->is_reg_mr[link->link_idx] = true; 2211 } 2212 return 0; 2213 } 2214 2215 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct rw_semaphore *lock, 2216 struct list_head *lst, bool is_rmb) 2217 { 2218 struct smc_buf_desc *buf_desc, *bf; 2219 int rc = 0; 2220 2221 down_write(lock); 2222 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2223 if (!buf_desc->used) 2224 continue; 2225 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2226 if (rc) 2227 goto out; 2228 } 2229 out: 2230 up_write(lock); 2231 return rc; 2232 } 2233 2234 /* map all used buffers of lgr for a new link */ 2235 int smcr_buf_map_lgr(struct smc_link *lnk) 2236 { 2237 struct smc_link_group *lgr = lnk->lgr; 2238 int i, rc = 0; 2239 2240 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2241 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2242 &lgr->rmbs[i], true); 2243 if (rc) 2244 return rc; 2245 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2246 &lgr->sndbufs[i], false); 2247 if (rc) 2248 return rc; 2249 } 2250 return 0; 2251 } 2252 2253 /* register all used buffers of lgr for a new link, 2254 * must be called under lgr->llc_conf_mutex lock 2255 */ 2256 int smcr_buf_reg_lgr(struct smc_link *lnk) 2257 { 2258 struct smc_link_group *lgr = lnk->lgr; 2259 struct smc_buf_desc *buf_desc, *bf; 2260 int i, rc = 0; 2261 2262 /* reg all RMBs for a new link */ 2263 down_write(&lgr->rmbs_lock); 2264 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2265 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2266 if (!buf_desc->used) 2267 continue; 2268 rc = smcr_link_reg_buf(lnk, buf_desc); 2269 if (rc) { 2270 up_write(&lgr->rmbs_lock); 2271 return rc; 2272 } 2273 } 2274 } 2275 up_write(&lgr->rmbs_lock); 2276 2277 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2278 return rc; 2279 2280 /* reg all vzalloced sndbufs for a new link */ 2281 down_write(&lgr->sndbufs_lock); 2282 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2283 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2284 if (!buf_desc->used || !buf_desc->is_vm) 2285 continue; 2286 rc = smcr_link_reg_buf(lnk, buf_desc); 2287 if (rc) { 2288 up_write(&lgr->sndbufs_lock); 2289 return rc; 2290 } 2291 } 2292 } 2293 up_write(&lgr->sndbufs_lock); 2294 return rc; 2295 } 2296 2297 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2298 int bufsize) 2299 { 2300 struct smc_buf_desc *buf_desc; 2301 2302 /* try to alloc a new buffer */ 2303 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2304 if (!buf_desc) 2305 return ERR_PTR(-ENOMEM); 2306 2307 switch (lgr->buf_type) { 2308 case SMCR_PHYS_CONT_BUFS: 2309 case SMCR_MIXED_BUFS: 2310 buf_desc->order = get_order(bufsize); 2311 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2312 __GFP_NOMEMALLOC | __GFP_COMP | 2313 __GFP_NORETRY | __GFP_ZERO, 2314 buf_desc->order); 2315 if (buf_desc->pages) { 2316 buf_desc->cpu_addr = 2317 (void *)page_address(buf_desc->pages); 2318 buf_desc->len = bufsize; 2319 buf_desc->is_vm = false; 2320 break; 2321 } 2322 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2323 goto out; 2324 fallthrough; // try virtually continguous buf 2325 case SMCR_VIRT_CONT_BUFS: 2326 buf_desc->order = get_order(bufsize); 2327 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2328 if (!buf_desc->cpu_addr) 2329 goto out; 2330 buf_desc->pages = NULL; 2331 buf_desc->len = bufsize; 2332 buf_desc->is_vm = true; 2333 break; 2334 } 2335 return buf_desc; 2336 2337 out: 2338 kfree(buf_desc); 2339 return ERR_PTR(-EAGAIN); 2340 } 2341 2342 /* map buf_desc on all usable links, 2343 * unused buffers stay mapped as long as the link is up 2344 */ 2345 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2346 struct smc_buf_desc *buf_desc, bool is_rmb) 2347 { 2348 int i, rc = 0, cnt = 0; 2349 2350 /* protect against parallel link reconfiguration */ 2351 down_read(&lgr->llc_conf_mutex); 2352 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2353 struct smc_link *lnk = &lgr->lnk[i]; 2354 2355 if (!smc_link_usable(lnk)) 2356 continue; 2357 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2358 rc = -ENOMEM; 2359 goto out; 2360 } 2361 cnt++; 2362 } 2363 out: 2364 up_read(&lgr->llc_conf_mutex); 2365 if (!rc && !cnt) 2366 rc = -EINVAL; 2367 return rc; 2368 } 2369 2370 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2371 bool is_dmb, int bufsize) 2372 { 2373 struct smc_buf_desc *buf_desc; 2374 int rc; 2375 2376 /* try to alloc a new DMB */ 2377 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2378 if (!buf_desc) 2379 return ERR_PTR(-ENOMEM); 2380 if (is_dmb) { 2381 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2382 if (rc) { 2383 kfree(buf_desc); 2384 if (rc == -ENOMEM) 2385 return ERR_PTR(-EAGAIN); 2386 if (rc == -ENOSPC) 2387 return ERR_PTR(-ENOSPC); 2388 return ERR_PTR(-EIO); 2389 } 2390 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2391 /* CDC header stored in buf. So, pretend it was smaller */ 2392 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2393 } else { 2394 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2395 __GFP_NOWARN | __GFP_NORETRY | 2396 __GFP_NOMEMALLOC); 2397 if (!buf_desc->cpu_addr) { 2398 kfree(buf_desc); 2399 return ERR_PTR(-EAGAIN); 2400 } 2401 buf_desc->len = bufsize; 2402 } 2403 return buf_desc; 2404 } 2405 2406 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2407 { 2408 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2409 struct smc_connection *conn = &smc->conn; 2410 struct smc_link_group *lgr = conn->lgr; 2411 struct list_head *buf_list; 2412 int bufsize, bufsize_comp; 2413 struct rw_semaphore *lock; /* lock buffer list */ 2414 bool is_dgraded = false; 2415 2416 if (is_rmb) 2417 /* use socket recv buffer size (w/o overhead) as start value */ 2418 bufsize = smc->sk.sk_rcvbuf / 2; 2419 else 2420 /* use socket send buffer size (w/o overhead) as start value */ 2421 bufsize = smc->sk.sk_sndbuf / 2; 2422 2423 for (bufsize_comp = smc_compress_bufsize(bufsize, is_smcd, is_rmb); 2424 bufsize_comp >= 0; bufsize_comp--) { 2425 if (is_rmb) { 2426 lock = &lgr->rmbs_lock; 2427 buf_list = &lgr->rmbs[bufsize_comp]; 2428 } else { 2429 lock = &lgr->sndbufs_lock; 2430 buf_list = &lgr->sndbufs[bufsize_comp]; 2431 } 2432 bufsize = smc_uncompress_bufsize(bufsize_comp); 2433 2434 /* check for reusable slot in the link group */ 2435 buf_desc = smc_buf_get_slot(bufsize_comp, lock, buf_list); 2436 if (buf_desc) { 2437 buf_desc->is_dma_need_sync = 0; 2438 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, true, bufsize); 2439 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2440 break; /* found reusable slot */ 2441 } 2442 2443 if (is_smcd) 2444 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2445 else 2446 buf_desc = smcr_new_buf_create(lgr, bufsize); 2447 2448 if (PTR_ERR(buf_desc) == -ENOMEM) 2449 break; 2450 if (IS_ERR(buf_desc)) { 2451 if (!is_dgraded) { 2452 is_dgraded = true; 2453 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2454 } 2455 continue; 2456 } 2457 2458 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2459 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, true, bufsize); 2460 buf_desc->used = 1; 2461 down_write(lock); 2462 smc_lgr_buf_list_add(lgr, is_rmb, buf_list, buf_desc); 2463 up_write(lock); 2464 break; /* found */ 2465 } 2466 2467 if (IS_ERR(buf_desc)) 2468 return PTR_ERR(buf_desc); 2469 2470 if (!is_smcd) { 2471 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2472 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2473 return -ENOMEM; 2474 } 2475 } 2476 2477 if (is_rmb) { 2478 conn->rmb_desc = buf_desc; 2479 conn->rmbe_size_comp = bufsize_comp; 2480 smc->sk.sk_rcvbuf = bufsize * 2; 2481 atomic_set(&conn->bytes_to_rcv, 0); 2482 conn->rmbe_update_limit = 2483 smc_rmb_wnd_update_limit(buf_desc->len); 2484 if (is_smcd) 2485 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2486 } else { 2487 conn->sndbuf_desc = buf_desc; 2488 smc->sk.sk_sndbuf = bufsize * 2; 2489 atomic_set(&conn->sndbuf_space, bufsize); 2490 } 2491 return 0; 2492 } 2493 2494 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2495 { 2496 if (!conn->sndbuf_desc->is_dma_need_sync) 2497 return; 2498 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2499 !smc_link_active(conn->lnk)) 2500 return; 2501 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2502 } 2503 2504 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2505 { 2506 int i; 2507 2508 if (!conn->rmb_desc->is_dma_need_sync) 2509 return; 2510 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2511 return; 2512 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2513 if (!smc_link_active(&conn->lgr->lnk[i])) 2514 continue; 2515 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2516 DMA_FROM_DEVICE); 2517 } 2518 } 2519 2520 /* create the send and receive buffer for an SMC socket; 2521 * receive buffers are called RMBs; 2522 * (even though the SMC protocol allows more than one RMB-element per RMB, 2523 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2524 * extra RMB for every connection in a link group 2525 */ 2526 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2527 { 2528 int rc; 2529 2530 /* create send buffer */ 2531 if (is_smcd && 2532 smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) 2533 goto create_rmb; 2534 2535 rc = __smc_buf_create(smc, is_smcd, false); 2536 if (rc) 2537 return rc; 2538 2539 create_rmb: 2540 /* create rmb */ 2541 rc = __smc_buf_create(smc, is_smcd, true); 2542 if (rc && smc->conn.sndbuf_desc) { 2543 down_write(&smc->conn.lgr->sndbufs_lock); 2544 smc_lgr_buf_list_del(smc->conn.lgr, false, 2545 smc->conn.sndbuf_desc); 2546 up_write(&smc->conn.lgr->sndbufs_lock); 2547 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2548 smc->conn.sndbuf_desc = NULL; 2549 } 2550 return rc; 2551 } 2552 2553 int smcd_buf_attach(struct smc_sock *smc) 2554 { 2555 struct smc_connection *conn = &smc->conn; 2556 struct smcd_dev *smcd = conn->lgr->smcd; 2557 u64 peer_token = conn->peer_token; 2558 struct smc_buf_desc *buf_desc; 2559 int rc; 2560 2561 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2562 if (!buf_desc) 2563 return -ENOMEM; 2564 2565 /* The ghost sndbuf_desc describes the same memory region as 2566 * peer RMB. Its lifecycle is consistent with the connection's 2567 * and it will be freed with the connections instead of the 2568 * link group. 2569 */ 2570 rc = smc_ism_attach_dmb(smcd, peer_token, buf_desc); 2571 if (rc) 2572 goto free; 2573 2574 smc->sk.sk_sndbuf = buf_desc->len; 2575 buf_desc->cpu_addr = 2576 (u8 *)buf_desc->cpu_addr + sizeof(struct smcd_cdc_msg); 2577 buf_desc->len -= sizeof(struct smcd_cdc_msg); 2578 conn->sndbuf_desc = buf_desc; 2579 conn->sndbuf_desc->used = 1; 2580 atomic_set(&conn->sndbuf_space, conn->sndbuf_desc->len); 2581 return 0; 2582 2583 free: 2584 kfree(buf_desc); 2585 return rc; 2586 } 2587 2588 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2589 { 2590 int i; 2591 2592 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2593 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2594 return i; 2595 } 2596 return -ENOSPC; 2597 } 2598 2599 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2600 u32 rkey) 2601 { 2602 int i; 2603 2604 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2605 if (test_bit(i, lgr->rtokens_used_mask) && 2606 lgr->rtokens[i][lnk_idx].rkey == rkey) 2607 return i; 2608 } 2609 return -ENOENT; 2610 } 2611 2612 /* set rtoken for a new link to an existing rmb */ 2613 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2614 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2615 { 2616 int rtok_idx; 2617 2618 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2619 if (rtok_idx == -ENOENT) 2620 return; 2621 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2622 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2623 } 2624 2625 /* set rtoken for a new link whose link_id is given */ 2626 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2627 __be64 nw_vaddr, __be32 nw_rkey) 2628 { 2629 u64 dma_addr = be64_to_cpu(nw_vaddr); 2630 u32 rkey = ntohl(nw_rkey); 2631 bool found = false; 2632 int link_idx; 2633 2634 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2635 if (lgr->lnk[link_idx].link_id == link_id) { 2636 found = true; 2637 break; 2638 } 2639 } 2640 if (!found) 2641 return; 2642 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2643 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2644 } 2645 2646 /* add a new rtoken from peer */ 2647 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2648 { 2649 struct smc_link_group *lgr = smc_get_lgr(lnk); 2650 u64 dma_addr = be64_to_cpu(nw_vaddr); 2651 u32 rkey = ntohl(nw_rkey); 2652 int i; 2653 2654 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2655 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2656 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2657 test_bit(i, lgr->rtokens_used_mask)) { 2658 /* already in list */ 2659 return i; 2660 } 2661 } 2662 i = smc_rmb_reserve_rtoken_idx(lgr); 2663 if (i < 0) 2664 return i; 2665 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2666 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2667 return i; 2668 } 2669 2670 /* delete an rtoken from all links */ 2671 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2672 { 2673 struct smc_link_group *lgr = smc_get_lgr(lnk); 2674 u32 rkey = ntohl(nw_rkey); 2675 int i, j; 2676 2677 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2678 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2679 test_bit(i, lgr->rtokens_used_mask)) { 2680 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2681 lgr->rtokens[i][j].rkey = 0; 2682 lgr->rtokens[i][j].dma_addr = 0; 2683 } 2684 clear_bit(i, lgr->rtokens_used_mask); 2685 return 0; 2686 } 2687 } 2688 return -ENOENT; 2689 } 2690 2691 /* save rkey and dma_addr received from peer during clc handshake */ 2692 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2693 struct smc_link *lnk, 2694 struct smc_clc_msg_accept_confirm *clc) 2695 { 2696 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2697 clc->r0.rmb_rkey); 2698 if (conn->rtoken_idx < 0) 2699 return conn->rtoken_idx; 2700 return 0; 2701 } 2702 2703 static void smc_core_going_away(void) 2704 { 2705 struct smc_ib_device *smcibdev; 2706 struct smcd_dev *smcd; 2707 2708 mutex_lock(&smc_ib_devices.mutex); 2709 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2710 int i; 2711 2712 for (i = 0; i < SMC_MAX_PORTS; i++) 2713 set_bit(i, smcibdev->ports_going_away); 2714 } 2715 mutex_unlock(&smc_ib_devices.mutex); 2716 2717 mutex_lock(&smcd_dev_list.mutex); 2718 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2719 smcd->going_away = 1; 2720 } 2721 mutex_unlock(&smcd_dev_list.mutex); 2722 } 2723 2724 /* Clean up all SMC link groups */ 2725 static void smc_lgrs_shutdown(void) 2726 { 2727 struct smcd_dev *smcd; 2728 2729 smc_core_going_away(); 2730 2731 smc_smcr_terminate_all(NULL); 2732 2733 mutex_lock(&smcd_dev_list.mutex); 2734 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2735 smc_smcd_terminate_all(smcd); 2736 mutex_unlock(&smcd_dev_list.mutex); 2737 } 2738 2739 static int smc_core_reboot_event(struct notifier_block *this, 2740 unsigned long event, void *ptr) 2741 { 2742 smc_lgrs_shutdown(); 2743 smc_ib_unregister_client(); 2744 smc_ism_exit(); 2745 return 0; 2746 } 2747 2748 static struct notifier_block smc_reboot_notifier = { 2749 .notifier_call = smc_core_reboot_event, 2750 }; 2751 2752 int __init smc_core_init(void) 2753 { 2754 return register_reboot_notifier(&smc_reboot_notifier); 2755 } 2756 2757 /* Called (from smc_exit) when module is removed */ 2758 void smc_core_exit(void) 2759 { 2760 unregister_reboot_notifier(&smc_reboot_notifier); 2761 smc_lgrs_shutdown(); 2762 } 2763