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_percpu_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 copy_to_smcdgid(&smcd_gid, &smcd->dibs->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 lnk->wr_rx_sge_cnt = lnk->smcibdev->ibdev->attrs.max_recv_sge < 2 ? 1 : 2; 799 lnk->wr_rx_buflen = smc_link_shared_v2_rxbuf(lnk) ? 800 SMC_WR_BUF_SIZE : SMC_WR_BUF_V2_SIZE; 801 } else { 802 lnk->smcibdev = ini->ib_dev; 803 lnk->ibport = ini->ib_port; 804 lnk->wr_rx_sge_cnt = 1; 805 lnk->wr_rx_buflen = SMC_WR_BUF_SIZE; 806 } 807 get_device(&lnk->smcibdev->ibdev->dev); 808 atomic_inc(&lnk->smcibdev->lnk_cnt); 809 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 810 lnk->clearing = 0; 811 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 812 lnk->link_id = smcr_next_link_id(lgr); 813 lnk->max_send_wr = lgr->max_send_wr; 814 lnk->max_recv_wr = lgr->max_recv_wr; 815 lnk->lgr = lgr; 816 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 817 lnk->link_idx = link_idx; 818 lnk->wr_rx_id_compl = 0; 819 smc_ibdev_cnt_inc(lnk); 820 smcr_copy_dev_info_to_link(lnk); 821 atomic_set(&lnk->conn_cnt, 0); 822 smc_llc_link_set_uid(lnk); 823 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 824 if (!lnk->smcibdev->initialized) { 825 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 826 if (rc) 827 goto out; 828 } 829 get_random_bytes(rndvec, sizeof(rndvec)); 830 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 831 (rndvec[2] << 16); 832 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 833 ini->vlan_id, lnk->gid, &lnk->sgid_index, 834 lgr->smc_version == SMC_V2 ? 835 &ini->smcrv2 : NULL); 836 if (rc) 837 goto out; 838 rc = smc_llc_link_init(lnk); 839 if (rc) 840 goto out; 841 rc = smc_ib_create_protection_domain(lnk); 842 if (rc) 843 goto clear_llc_lnk; 844 do { 845 rc = smc_ib_create_queue_pair(lnk); 846 if (rc) 847 goto dealloc_pd; 848 rc = smc_wr_alloc_link_mem(lnk); 849 if (!rc) 850 break; 851 else if (rc != -ENOMEM) /* give up */ 852 goto destroy_qp; 853 /* retry with smaller ... */ 854 lnk->max_send_wr /= 2; 855 lnk->max_recv_wr /= 2; 856 /* ... unless droping below old SMC_WR_BUF_SIZE */ 857 if (lnk->max_send_wr < 16 || lnk->max_recv_wr < 48) 858 goto destroy_qp; 859 smc_ib_destroy_queue_pair(lnk); 860 } while (1); 861 862 rc = smc_wr_create_link(lnk); 863 if (rc) 864 goto free_link_mem; 865 lnk->state = SMC_LNK_ACTIVATING; 866 return 0; 867 868 free_link_mem: 869 smc_wr_free_link_mem(lnk); 870 destroy_qp: 871 smc_ib_destroy_queue_pair(lnk); 872 dealloc_pd: 873 smc_ib_dealloc_protection_domain(lnk); 874 clear_llc_lnk: 875 smc_llc_link_clear(lnk, false); 876 out: 877 smc_ibdev_cnt_dec(lnk); 878 put_device(&lnk->smcibdev->ibdev->dev); 879 smcibdev = lnk->smcibdev; 880 memset(lnk, 0, sizeof(struct smc_link)); 881 lnk->state = SMC_LNK_UNUSED; 882 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 883 wake_up(&smcibdev->lnks_deleted); 884 smc_lgr_put(lgr); /* lgr_hold above */ 885 return rc; 886 } 887 888 /* create a new SMC link group */ 889 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 890 { 891 struct smc_link_group *lgr; 892 struct list_head *lgr_list; 893 struct smcd_dev *smcd; 894 struct smc_link *lnk; 895 spinlock_t *lgr_lock; 896 u8 link_idx; 897 int rc = 0; 898 int i; 899 900 if (ini->is_smcd && ini->vlan_id) { 901 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 902 ini->vlan_id)) { 903 rc = SMC_CLC_DECL_ISMVLANERR; 904 goto out; 905 } 906 } 907 908 lgr = kzalloc_obj(*lgr); 909 if (!lgr) { 910 rc = SMC_CLC_DECL_MEM; 911 goto ism_put_vlan; 912 } 913 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", WQ_PERCPU, 0, 914 SMC_LGR_ID_SIZE, &lgr->id); 915 if (!lgr->tx_wq) { 916 rc = -ENOMEM; 917 goto free_lgr; 918 } 919 lgr->is_smcd = ini->is_smcd; 920 lgr->sync_err = 0; 921 lgr->terminating = 0; 922 lgr->freeing = 0; 923 lgr->vlan_id = ini->vlan_id; 924 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 925 init_rwsem(&lgr->sndbufs_lock); 926 init_rwsem(&lgr->rmbs_lock); 927 rwlock_init(&lgr->conns_lock); 928 for (i = 0; i < SMC_RMBE_SIZES; i++) { 929 INIT_LIST_HEAD(&lgr->sndbufs[i]); 930 INIT_LIST_HEAD(&lgr->rmbs[i]); 931 } 932 lgr->next_link_id = 0; 933 smc_lgr_list.num += SMC_LGR_NUM_INCR; 934 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 935 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 936 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 937 lgr->conns_all = RB_ROOT; 938 if (ini->is_smcd) { 939 /* SMC-D specific settings */ 940 smcd = ini->ism_dev[ini->ism_selected]; 941 get_device(&smcd->dibs->dev); 942 lgr->peer_gid.gid = 943 ini->ism_peer_gid[ini->ism_selected].gid; 944 lgr->peer_gid.gid_ext = 945 ini->ism_peer_gid[ini->ism_selected].gid_ext; 946 lgr->smcd = ini->ism_dev[ini->ism_selected]; 947 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 948 lgr_lock = &lgr->smcd->lgr_lock; 949 lgr->smc_version = ini->smcd_version; 950 lgr->peer_shutdown = 0; 951 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 952 } else { 953 /* SMC-R specific settings */ 954 struct smc_ib_device *ibdev; 955 int ibport; 956 957 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 958 lgr->smc_version = ini->smcr_version; 959 memcpy(lgr->peer_systemid, ini->peer_systemid, 960 SMC_SYSTEMID_LEN); 961 if (lgr->smc_version == SMC_V2) { 962 ibdev = ini->smcrv2.ib_dev_v2; 963 ibport = ini->smcrv2.ib_port_v2; 964 lgr->saddr = ini->smcrv2.saddr; 965 lgr->uses_gateway = ini->smcrv2.uses_gateway; 966 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 967 ETH_ALEN); 968 lgr->max_conns = ini->max_conns; 969 lgr->max_links = ini->max_links; 970 } else { 971 ibdev = ini->ib_dev; 972 ibport = ini->ib_port; 973 lgr->max_conns = SMC_CONN_PER_LGR_MAX; 974 lgr->max_links = SMC_LINKS_ADD_LNK_MAX; 975 } 976 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 977 SMC_MAX_PNETID_LEN); 978 rc = smc_wr_alloc_lgr_mem(lgr); 979 if (rc) 980 goto free_wq; 981 smc_llc_lgr_init(lgr, smc); 982 983 link_idx = SMC_SINGLE_LINK; 984 lnk = &lgr->lnk[link_idx]; 985 rc = smcr_link_init(lgr, lnk, link_idx, ini); 986 if (rc) { 987 smc_wr_free_lgr_mem(lgr); 988 goto free_wq; 989 } 990 lgr->net = smc_ib_net(lnk->smcibdev); 991 lgr_list = &smc_lgr_list.list; 992 lgr_lock = &smc_lgr_list.lock; 993 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 994 atomic_inc(&lgr_cnt); 995 } 996 smc->conn.lgr = lgr; 997 spin_lock_bh(lgr_lock); 998 list_add_tail(&lgr->list, lgr_list); 999 spin_unlock_bh(lgr_lock); 1000 return 0; 1001 1002 free_wq: 1003 destroy_workqueue(lgr->tx_wq); 1004 free_lgr: 1005 kfree(lgr); 1006 ism_put_vlan: 1007 if (ini->is_smcd && ini->vlan_id) 1008 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 1009 out: 1010 if (rc < 0) { 1011 if (rc == -ENOMEM) 1012 rc = SMC_CLC_DECL_MEM; 1013 else 1014 rc = SMC_CLC_DECL_INTERR; 1015 } 1016 return rc; 1017 } 1018 1019 static int smc_write_space(struct smc_connection *conn) 1020 { 1021 int buffer_len = conn->peer_rmbe_size; 1022 union smc_host_cursor prod; 1023 union smc_host_cursor cons; 1024 int space; 1025 1026 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 1027 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 1028 /* determine rx_buf space */ 1029 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 1030 return space; 1031 } 1032 1033 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 1034 struct smc_wr_buf *wr_buf) 1035 { 1036 struct smc_connection *conn = &smc->conn; 1037 union smc_host_cursor cons, fin; 1038 int rc = 0; 1039 int diff; 1040 1041 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 1042 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 1043 /* set prod cursor to old state, enforce tx_rdma_writes() */ 1044 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 1045 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 1046 1047 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 1048 /* cons cursor advanced more than fin, and prod was set 1049 * fin above, so now prod is smaller than cons. Fix that. 1050 */ 1051 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 1052 smc_curs_add(conn->sndbuf_desc->len, 1053 &conn->tx_curs_sent, diff); 1054 smc_curs_add(conn->sndbuf_desc->len, 1055 &conn->tx_curs_fin, diff); 1056 1057 smp_mb__before_atomic(); 1058 atomic_add(diff, &conn->sndbuf_space); 1059 smp_mb__after_atomic(); 1060 1061 smc_curs_add(conn->peer_rmbe_size, 1062 &conn->local_tx_ctrl.prod, diff); 1063 smc_curs_add(conn->peer_rmbe_size, 1064 &conn->local_tx_ctrl_fin, diff); 1065 } 1066 /* recalculate, value is used by tx_rdma_writes() */ 1067 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 1068 1069 if (smc->sk.sk_state != SMC_INIT && 1070 smc->sk.sk_state != SMC_CLOSED) { 1071 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 1072 if (!rc) { 1073 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 1074 smc->sk.sk_data_ready(&smc->sk); 1075 } 1076 } else { 1077 smc_wr_tx_put_slot(conn->lnk, 1078 (struct smc_wr_tx_pend_priv *)pend); 1079 } 1080 return rc; 1081 } 1082 1083 void smc_switch_link_and_count(struct smc_connection *conn, 1084 struct smc_link *to_lnk) 1085 { 1086 atomic_dec(&conn->lnk->conn_cnt); 1087 /* link_hold in smc_conn_create() */ 1088 smcr_link_put(conn->lnk); 1089 conn->lnk = to_lnk; 1090 atomic_inc(&conn->lnk->conn_cnt); 1091 /* link_put in smc_conn_free() */ 1092 smcr_link_hold(conn->lnk); 1093 } 1094 1095 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1096 struct smc_link *from_lnk, bool is_dev_err) 1097 { 1098 struct smc_link *to_lnk = NULL; 1099 struct smc_cdc_tx_pend *pend; 1100 struct smc_connection *conn; 1101 struct smc_wr_buf *wr_buf; 1102 struct smc_sock *smc; 1103 struct rb_node *node; 1104 int i, rc = 0; 1105 1106 /* link is inactive, wake up tx waiters */ 1107 smc_wr_wakeup_tx_wait(from_lnk); 1108 1109 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1110 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1111 continue; 1112 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1113 from_lnk->ibport == lgr->lnk[i].ibport) { 1114 continue; 1115 } 1116 to_lnk = &lgr->lnk[i]; 1117 break; 1118 } 1119 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1120 smc_lgr_terminate_sched(lgr); 1121 return NULL; 1122 } 1123 again: 1124 read_lock_bh(&lgr->conns_lock); 1125 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1126 conn = rb_entry(node, struct smc_connection, alert_node); 1127 if (conn->lnk != from_lnk) 1128 continue; 1129 smc = container_of(conn, struct smc_sock, conn); 1130 /* conn->lnk not yet set in SMC_INIT state */ 1131 if (smc->sk.sk_state == SMC_INIT) 1132 continue; 1133 if (smc->sk.sk_state == SMC_CLOSED || 1134 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1135 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1136 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1137 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1138 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1139 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1140 smc->sk.sk_state == SMC_PEERABORTWAIT || 1141 smc->sk.sk_state == SMC_PROCESSABORT) { 1142 spin_lock_bh(&conn->send_lock); 1143 smc_switch_link_and_count(conn, to_lnk); 1144 spin_unlock_bh(&conn->send_lock); 1145 continue; 1146 } 1147 sock_hold(&smc->sk); 1148 read_unlock_bh(&lgr->conns_lock); 1149 /* pre-fetch buffer outside of send_lock, might sleep */ 1150 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1151 if (!rc) { 1152 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1153 spin_lock_bh(&conn->send_lock); 1154 smc_switch_link_and_count(conn, to_lnk); 1155 rc = smc_switch_cursor(smc, pend, wr_buf); 1156 spin_unlock_bh(&conn->send_lock); 1157 } 1158 sock_put(&smc->sk); 1159 if (rc) 1160 goto err_out; 1161 goto again; 1162 } 1163 read_unlock_bh(&lgr->conns_lock); 1164 smc_wr_tx_link_put(to_lnk); 1165 return to_lnk; 1166 1167 err_out: 1168 smcr_link_down_cond_sched(to_lnk); 1169 smc_wr_tx_link_put(to_lnk); 1170 return NULL; 1171 } 1172 1173 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1174 struct smc_link_group *lgr) 1175 { 1176 struct rw_semaphore *lock; /* lock buffer list */ 1177 int rc; 1178 1179 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1180 /* unregister rmb with peer */ 1181 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1182 if (!rc) { 1183 /* protect against smc_llc_cli_rkey_exchange() */ 1184 down_read(&lgr->llc_conf_mutex); 1185 smc_llc_do_delete_rkey(lgr, buf_desc); 1186 buf_desc->is_conf_rkey = false; 1187 up_read(&lgr->llc_conf_mutex); 1188 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1189 } 1190 } 1191 1192 if (buf_desc->is_reg_err) { 1193 /* buf registration failed, reuse not possible */ 1194 lock = is_rmb ? &lgr->rmbs_lock : 1195 &lgr->sndbufs_lock; 1196 down_write(lock); 1197 smc_lgr_buf_list_del(lgr, is_rmb, buf_desc); 1198 up_write(lock); 1199 1200 smc_buf_free(lgr, is_rmb, buf_desc); 1201 } else { 1202 /* memzero_explicit provides potential memory barrier semantics */ 1203 memzero_explicit(buf_desc->cpu_addr, buf_desc->len); 1204 WRITE_ONCE(buf_desc->used, 0); 1205 } 1206 } 1207 1208 static void smcd_buf_detach(struct smc_connection *conn) 1209 { 1210 struct smcd_dev *smcd = conn->lgr->smcd; 1211 u64 peer_token = conn->peer_token; 1212 struct smc_buf_desc *buf_desc; 1213 1214 if (!conn->sndbuf_desc) 1215 return; 1216 1217 smc_ism_detach_dmb(smcd, peer_token); 1218 1219 buf_desc = conn->sndbuf_desc; 1220 conn->sndbuf_desc = NULL; 1221 kfree(buf_desc); 1222 } 1223 1224 static void smc_buf_unuse(struct smc_connection *conn, 1225 struct smc_link_group *lgr) 1226 { 1227 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1228 bool is_smcd = lgr->is_smcd; 1229 int bufsize; 1230 1231 if (conn->sndbuf_desc) { 1232 bufsize = conn->sndbuf_desc->len; 1233 if (!is_smcd && conn->sndbuf_desc->is_vm) { 1234 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1235 } else { 1236 memzero_explicit(conn->sndbuf_desc->cpu_addr, bufsize); 1237 WRITE_ONCE(conn->sndbuf_desc->used, 0); 1238 } 1239 SMC_STAT_RMB_SIZE(smc, is_smcd, false, false, bufsize); 1240 } 1241 if (conn->rmb_desc) { 1242 bufsize = conn->rmb_desc->len; 1243 if (!is_smcd) { 1244 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1245 } else { 1246 bufsize += sizeof(struct smcd_cdc_msg); 1247 memzero_explicit(conn->rmb_desc->cpu_addr, bufsize); 1248 WRITE_ONCE(conn->rmb_desc->used, 0); 1249 } 1250 SMC_STAT_RMB_SIZE(smc, is_smcd, true, false, bufsize); 1251 } 1252 } 1253 1254 /* remove a finished connection from its link group */ 1255 void smc_conn_free(struct smc_connection *conn) 1256 { 1257 struct smc_link_group *lgr = conn->lgr; 1258 1259 if (!lgr || conn->freed) 1260 /* Connection has never been registered in a 1261 * link group, or has already been freed. 1262 */ 1263 return; 1264 1265 conn->freed = 1; 1266 if (!smc_conn_lgr_valid(conn)) 1267 /* Connection has already unregistered from 1268 * link group. 1269 */ 1270 goto lgr_put; 1271 1272 if (lgr->is_smcd) { 1273 smc_ism_unset_conn(conn); 1274 tasklet_kill(&conn->rx_tsklet); 1275 if (smc_ism_support_dmb_nocopy(lgr->smcd)) 1276 smcd_buf_detach(conn); 1277 } else { 1278 smc_cdc_wait_pend_tx_wr(conn); 1279 if (current_work() != &conn->abort_work) 1280 cancel_work_sync(&conn->abort_work); 1281 } 1282 if (!list_empty(&lgr->list)) { 1283 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1284 smc_lgr_unregister_conn(conn); 1285 } 1286 1287 if (!lgr->conns_num) 1288 smc_lgr_schedule_free_work(lgr); 1289 lgr_put: 1290 if (!lgr->is_smcd) 1291 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1292 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1293 } 1294 1295 /* unregister a link from a buf_desc */ 1296 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1297 struct smc_link *lnk) 1298 { 1299 if (is_rmb || buf_desc->is_vm) 1300 buf_desc->is_reg_mr[lnk->link_idx] = false; 1301 if (!buf_desc->is_map_ib[lnk->link_idx]) 1302 return; 1303 1304 if ((is_rmb || buf_desc->is_vm) && 1305 buf_desc->mr[lnk->link_idx]) { 1306 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1307 buf_desc->mr[lnk->link_idx] = NULL; 1308 } 1309 if (is_rmb) 1310 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1311 else 1312 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1313 1314 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1315 buf_desc->is_map_ib[lnk->link_idx] = false; 1316 } 1317 1318 /* unmap all buffers of lgr for a deleted link */ 1319 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1320 { 1321 struct smc_link_group *lgr = lnk->lgr; 1322 struct smc_buf_desc *buf_desc, *bf; 1323 int i; 1324 1325 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1326 down_write(&lgr->rmbs_lock); 1327 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1328 smcr_buf_unmap_link(buf_desc, true, lnk); 1329 up_write(&lgr->rmbs_lock); 1330 1331 down_write(&lgr->sndbufs_lock); 1332 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1333 list) 1334 smcr_buf_unmap_link(buf_desc, false, lnk); 1335 up_write(&lgr->sndbufs_lock); 1336 } 1337 } 1338 1339 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1340 { 1341 struct smc_link_group *lgr = lnk->lgr; 1342 int i; 1343 1344 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1345 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1346 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1347 } 1348 } 1349 1350 static void __smcr_link_clear(struct smc_link *lnk) 1351 { 1352 struct smc_link_group *lgr = lnk->lgr; 1353 struct smc_ib_device *smcibdev; 1354 1355 smc_wr_free_link_mem(lnk); 1356 smc_ibdev_cnt_dec(lnk); 1357 put_device(&lnk->smcibdev->ibdev->dev); 1358 smcibdev = lnk->smcibdev; 1359 memset(lnk, 0, sizeof(struct smc_link)); 1360 lnk->state = SMC_LNK_UNUSED; 1361 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1362 wake_up(&smcibdev->lnks_deleted); 1363 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1364 } 1365 1366 /* must be called under lgr->llc_conf_mutex lock */ 1367 void smcr_link_clear(struct smc_link *lnk, bool log) 1368 { 1369 if (!lnk->lgr || lnk->clearing || 1370 lnk->state == SMC_LNK_UNUSED) 1371 return; 1372 lnk->clearing = 1; 1373 lnk->peer_qpn = 0; 1374 smc_llc_link_clear(lnk, log); 1375 smcr_buf_unmap_lgr(lnk); 1376 smcr_rtoken_clear_link(lnk); 1377 smc_ib_modify_qp_error(lnk); 1378 smc_wr_free_link(lnk); 1379 smc_ib_destroy_queue_pair(lnk); 1380 smc_ib_dealloc_protection_domain(lnk); 1381 smcr_link_put(lnk); /* theoretically last link_put */ 1382 } 1383 1384 void smcr_link_hold(struct smc_link *lnk) 1385 { 1386 refcount_inc(&lnk->refcnt); 1387 } 1388 1389 void smcr_link_put(struct smc_link *lnk) 1390 { 1391 if (refcount_dec_and_test(&lnk->refcnt)) 1392 __smcr_link_clear(lnk); 1393 } 1394 1395 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1396 struct smc_buf_desc *buf_desc) 1397 { 1398 int i; 1399 1400 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1401 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1402 1403 if (!buf_desc->is_vm && buf_desc->pages) 1404 __free_pages(buf_desc->pages, buf_desc->order); 1405 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1406 vfree(buf_desc->cpu_addr); 1407 kfree(buf_desc); 1408 } 1409 1410 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1411 struct smc_buf_desc *buf_desc) 1412 { 1413 if (is_dmb) { 1414 /* restore original buf len */ 1415 buf_desc->len += sizeof(struct smcd_cdc_msg); 1416 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1417 } else { 1418 kfree(buf_desc->cpu_addr); 1419 } 1420 kfree(buf_desc); 1421 } 1422 1423 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1424 struct smc_buf_desc *buf_desc) 1425 { 1426 if (lgr->is_smcd) 1427 smcd_buf_free(lgr, is_rmb, buf_desc); 1428 else 1429 smcr_buf_free(lgr, is_rmb, buf_desc); 1430 } 1431 1432 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1433 { 1434 struct smc_buf_desc *buf_desc, *bf_desc; 1435 struct list_head *buf_list; 1436 int i; 1437 1438 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1439 if (is_rmb) 1440 buf_list = &lgr->rmbs[i]; 1441 else 1442 buf_list = &lgr->sndbufs[i]; 1443 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1444 list) { 1445 smc_lgr_buf_list_del(lgr, is_rmb, buf_desc); 1446 smc_buf_free(lgr, is_rmb, buf_desc); 1447 } 1448 } 1449 } 1450 1451 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1452 { 1453 /* free send buffers */ 1454 __smc_lgr_free_bufs(lgr, false); 1455 /* free rmbs */ 1456 __smc_lgr_free_bufs(lgr, true); 1457 } 1458 1459 /* won't be freed until no one accesses to lgr anymore */ 1460 static void __smc_lgr_free(struct smc_link_group *lgr) 1461 { 1462 smc_lgr_free_bufs(lgr); 1463 if (lgr->is_smcd) { 1464 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1465 wake_up(&lgr->smcd->lgrs_deleted); 1466 } else { 1467 smc_wr_free_lgr_mem(lgr); 1468 if (!atomic_dec_return(&lgr_cnt)) 1469 wake_up(&lgrs_deleted); 1470 } 1471 kfree(lgr); 1472 } 1473 1474 /* remove a link group */ 1475 static void smc_lgr_free(struct smc_link_group *lgr) 1476 { 1477 int i; 1478 1479 if (!lgr->is_smcd) { 1480 down_write(&lgr->llc_conf_mutex); 1481 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1482 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1483 smcr_link_clear(&lgr->lnk[i], false); 1484 } 1485 up_write(&lgr->llc_conf_mutex); 1486 smc_llc_lgr_clear(lgr); 1487 } 1488 1489 destroy_workqueue(lgr->tx_wq); 1490 if (lgr->is_smcd) { 1491 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1492 put_device(&lgr->smcd->dibs->dev); 1493 } 1494 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1495 } 1496 1497 void smc_lgr_hold(struct smc_link_group *lgr) 1498 { 1499 refcount_inc(&lgr->refcnt); 1500 } 1501 1502 void smc_lgr_put(struct smc_link_group *lgr) 1503 { 1504 if (refcount_dec_and_test(&lgr->refcnt)) 1505 __smc_lgr_free(lgr); 1506 } 1507 1508 static void smc_sk_wake_ups(struct smc_sock *smc) 1509 { 1510 smc->sk.sk_write_space(&smc->sk); 1511 smc->sk.sk_data_ready(&smc->sk); 1512 smc->sk.sk_state_change(&smc->sk); 1513 } 1514 1515 /* kill a connection */ 1516 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1517 { 1518 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1519 1520 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1521 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1522 else 1523 smc_close_abort(conn); 1524 conn->killed = 1; 1525 smc->sk.sk_err = ECONNABORTED; 1526 smc_sk_wake_ups(smc); 1527 if (conn->lgr->is_smcd) { 1528 smc_ism_unset_conn(conn); 1529 if (soft) 1530 tasklet_kill(&conn->rx_tsklet); 1531 else 1532 tasklet_unlock_wait(&conn->rx_tsklet); 1533 if (smc_ism_support_dmb_nocopy(conn->lgr->smcd)) 1534 smcd_buf_detach(conn); 1535 } else { 1536 smc_cdc_wait_pend_tx_wr(conn); 1537 } 1538 smc_lgr_unregister_conn(conn); 1539 smc_close_active_abort(smc); 1540 } 1541 1542 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1543 { 1544 if (lgr->is_smcd) { 1545 smc_ism_signal_shutdown(lgr); 1546 } else { 1547 u32 rsn = lgr->llc_termination_rsn; 1548 1549 if (!rsn) 1550 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1551 smc_llc_send_link_delete_all(lgr, false, rsn); 1552 smcr_lgr_link_deactivate_all(lgr); 1553 } 1554 } 1555 1556 /* terminate link group 1557 * @soft: true if link group shutdown can take its time 1558 * false if immediate link group shutdown is required 1559 */ 1560 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1561 { 1562 struct smc_connection *conn; 1563 struct smc_sock *smc; 1564 struct rb_node *node; 1565 1566 if (lgr->terminating) 1567 return; /* lgr already terminating */ 1568 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1569 cancel_delayed_work(&lgr->free_work); 1570 lgr->terminating = 1; 1571 1572 /* kill remaining link group connections */ 1573 read_lock_bh(&lgr->conns_lock); 1574 node = rb_first(&lgr->conns_all); 1575 while (node) { 1576 conn = rb_entry(node, struct smc_connection, alert_node); 1577 smc = container_of(conn, struct smc_sock, conn); 1578 sock_hold(&smc->sk); /* sock_put below */ 1579 read_unlock_bh(&lgr->conns_lock); 1580 lock_sock(&smc->sk); 1581 smc_conn_kill(conn, soft); 1582 release_sock(&smc->sk); 1583 sock_put(&smc->sk); /* sock_hold above */ 1584 read_lock_bh(&lgr->conns_lock); 1585 node = rb_first(&lgr->conns_all); 1586 } 1587 read_unlock_bh(&lgr->conns_lock); 1588 smc_lgr_cleanup(lgr); 1589 smc_lgr_free(lgr); 1590 } 1591 1592 /* unlink link group and schedule termination */ 1593 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1594 { 1595 spinlock_t *lgr_lock; 1596 1597 smc_lgr_list_head(lgr, &lgr_lock); 1598 spin_lock_bh(lgr_lock); 1599 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1600 spin_unlock_bh(lgr_lock); 1601 return; /* lgr already terminating */ 1602 } 1603 list_del_init(&lgr->list); 1604 lgr->freeing = 1; 1605 spin_unlock_bh(lgr_lock); 1606 schedule_work(&lgr->terminate_work); 1607 } 1608 1609 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1610 void smc_smcd_terminate(struct smcd_dev *dev, struct smcd_gid *peer_gid, 1611 unsigned short vlan) 1612 { 1613 struct smc_link_group *lgr, *l; 1614 LIST_HEAD(lgr_free_list); 1615 1616 /* run common cleanup function and build free list */ 1617 spin_lock_bh(&dev->lgr_lock); 1618 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1619 if ((!peer_gid->gid || 1620 (lgr->peer_gid.gid == peer_gid->gid && 1621 !smc_ism_is_emulated(dev) ? 1 : 1622 lgr->peer_gid.gid_ext == peer_gid->gid_ext)) && 1623 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1624 if (peer_gid->gid) /* peer triggered termination */ 1625 lgr->peer_shutdown = 1; 1626 list_move(&lgr->list, &lgr_free_list); 1627 lgr->freeing = 1; 1628 } 1629 } 1630 spin_unlock_bh(&dev->lgr_lock); 1631 1632 /* cancel the regular free workers and actually free lgrs */ 1633 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1634 list_del_init(&lgr->list); 1635 schedule_work(&lgr->terminate_work); 1636 } 1637 } 1638 1639 /* Called when an SMCD device is removed or the smc module is unloaded */ 1640 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1641 { 1642 struct smc_link_group *lgr, *lg; 1643 LIST_HEAD(lgr_free_list); 1644 1645 spin_lock_bh(&smcd->lgr_lock); 1646 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1647 list_for_each_entry(lgr, &lgr_free_list, list) 1648 lgr->freeing = 1; 1649 spin_unlock_bh(&smcd->lgr_lock); 1650 1651 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1652 list_del_init(&lgr->list); 1653 __smc_lgr_terminate(lgr, false); 1654 } 1655 1656 if (atomic_read(&smcd->lgr_cnt)) 1657 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1658 } 1659 1660 /* Called when an SMCR device is removed or the smc module is unloaded. 1661 * If smcibdev is given, all SMCR link groups using this device are terminated. 1662 * If smcibdev is NULL, all SMCR link groups are terminated. 1663 */ 1664 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1665 { 1666 struct smc_link_group *lgr, *lg; 1667 LIST_HEAD(lgr_free_list); 1668 int i; 1669 1670 spin_lock_bh(&smc_lgr_list.lock); 1671 if (!smcibdev) { 1672 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1673 list_for_each_entry(lgr, &lgr_free_list, list) 1674 lgr->freeing = 1; 1675 } else { 1676 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1677 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1678 if (lgr->lnk[i].smcibdev == smcibdev) 1679 smcr_link_down_cond_sched(&lgr->lnk[i]); 1680 } 1681 } 1682 } 1683 spin_unlock_bh(&smc_lgr_list.lock); 1684 1685 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1686 list_del_init(&lgr->list); 1687 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1688 __smc_lgr_terminate(lgr, false); 1689 } 1690 1691 if (smcibdev) { 1692 if (atomic_read(&smcibdev->lnk_cnt)) 1693 wait_event(smcibdev->lnks_deleted, 1694 !atomic_read(&smcibdev->lnk_cnt)); 1695 } else { 1696 if (atomic_read(&lgr_cnt)) 1697 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1698 } 1699 } 1700 1701 /* set new lgr type and clear all asymmetric link tagging */ 1702 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1703 { 1704 char *lgr_type = ""; 1705 int i; 1706 1707 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1708 if (smc_link_usable(&lgr->lnk[i])) 1709 lgr->lnk[i].link_is_asym = false; 1710 if (lgr->type == new_type) 1711 return; 1712 lgr->type = new_type; 1713 1714 switch (lgr->type) { 1715 case SMC_LGR_NONE: 1716 lgr_type = "NONE"; 1717 break; 1718 case SMC_LGR_SINGLE: 1719 lgr_type = "SINGLE"; 1720 break; 1721 case SMC_LGR_SYMMETRIC: 1722 lgr_type = "SYMMETRIC"; 1723 break; 1724 case SMC_LGR_ASYMMETRIC_PEER: 1725 lgr_type = "ASYMMETRIC_PEER"; 1726 break; 1727 case SMC_LGR_ASYMMETRIC_LOCAL: 1728 lgr_type = "ASYMMETRIC_LOCAL"; 1729 break; 1730 } 1731 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1732 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1733 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1734 } 1735 1736 /* set new lgr type and tag a link as asymmetric */ 1737 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1738 enum smc_lgr_type new_type, int asym_lnk_idx) 1739 { 1740 smcr_lgr_set_type(lgr, new_type); 1741 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1742 } 1743 1744 /* abort connection, abort_work scheduled from tasklet context */ 1745 static void smc_conn_abort_work(struct work_struct *work) 1746 { 1747 struct smc_connection *conn = container_of(work, 1748 struct smc_connection, 1749 abort_work); 1750 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1751 1752 lock_sock(&smc->sk); 1753 smc_conn_kill(conn, true); 1754 release_sock(&smc->sk); 1755 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1756 } 1757 1758 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1759 { 1760 struct smc_link_group *lgr, *n; 1761 1762 spin_lock_bh(&smc_lgr_list.lock); 1763 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1764 struct smc_link *link; 1765 1766 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1767 SMC_MAX_PNETID_LEN) || 1768 lgr->type == SMC_LGR_SYMMETRIC || 1769 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1770 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1771 continue; 1772 1773 if (lgr->type == SMC_LGR_SINGLE && lgr->max_links <= 1) 1774 continue; 1775 1776 /* trigger local add link processing */ 1777 link = smc_llc_usable_link(lgr); 1778 if (link) 1779 smc_llc_add_link_local(link); 1780 } 1781 spin_unlock_bh(&smc_lgr_list.lock); 1782 } 1783 1784 /* link is down - switch connections to alternate link, 1785 * must be called under lgr->llc_conf_mutex lock 1786 */ 1787 static void smcr_link_down(struct smc_link *lnk) 1788 { 1789 struct smc_link_group *lgr = lnk->lgr; 1790 struct smc_link *to_lnk; 1791 int del_link_id; 1792 1793 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1794 return; 1795 1796 to_lnk = smc_switch_conns(lgr, lnk, true); 1797 if (!to_lnk) { /* no backup link available */ 1798 smcr_link_clear(lnk, true); 1799 return; 1800 } 1801 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1802 del_link_id = lnk->link_id; 1803 1804 if (lgr->role == SMC_SERV) { 1805 /* trigger local delete link processing */ 1806 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1807 } else { 1808 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1809 /* another llc task is ongoing */ 1810 up_write(&lgr->llc_conf_mutex); 1811 wait_event_timeout(lgr->llc_flow_waiter, 1812 (list_empty(&lgr->list) || 1813 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1814 SMC_LLC_WAIT_TIME); 1815 down_write(&lgr->llc_conf_mutex); 1816 } 1817 if (!list_empty(&lgr->list)) { 1818 smc_llc_send_delete_link(to_lnk, del_link_id, 1819 SMC_LLC_REQ, true, 1820 SMC_LLC_DEL_LOST_PATH); 1821 smcr_link_clear(lnk, true); 1822 } 1823 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1824 } 1825 } 1826 1827 /* must be called under lgr->llc_conf_mutex lock */ 1828 void smcr_link_down_cond(struct smc_link *lnk) 1829 { 1830 if (smc_link_downing(&lnk->state)) { 1831 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1832 smcr_link_down(lnk); 1833 } 1834 } 1835 1836 /* will get the lgr->llc_conf_mutex lock */ 1837 void smcr_link_down_cond_sched(struct smc_link *lnk) 1838 { 1839 if (smc_link_downing(&lnk->state)) { 1840 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1841 smcr_link_hold(lnk); /* smcr_link_put in link_down_wrk */ 1842 if (!schedule_work(&lnk->link_down_wrk)) 1843 smcr_link_put(lnk); 1844 } 1845 } 1846 1847 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1848 { 1849 struct smc_link_group *lgr, *n; 1850 int i; 1851 1852 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1853 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1854 SMC_MAX_PNETID_LEN)) 1855 continue; /* lgr is not affected */ 1856 if (list_empty(&lgr->list)) 1857 continue; 1858 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1859 struct smc_link *lnk = &lgr->lnk[i]; 1860 1861 if (smc_link_usable(lnk) && 1862 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1863 smcr_link_down_cond_sched(lnk); 1864 } 1865 } 1866 } 1867 1868 static void smc_link_down_work(struct work_struct *work) 1869 { 1870 struct smc_link *link = container_of(work, struct smc_link, 1871 link_down_wrk); 1872 struct smc_link_group *lgr = link->lgr; 1873 1874 if (list_empty(&lgr->list)) 1875 goto out; 1876 wake_up_all(&lgr->llc_msg_waiter); 1877 down_write(&lgr->llc_conf_mutex); 1878 smcr_link_down(link); 1879 up_write(&lgr->llc_conf_mutex); 1880 1881 out: 1882 smcr_link_put(link); /* smcr_link_hold by schedulers of link_down_work */ 1883 } 1884 1885 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1886 struct netdev_nested_priv *priv) 1887 { 1888 unsigned short *vlan_id = (unsigned short *)priv->data; 1889 1890 if (is_vlan_dev(lower_dev)) { 1891 *vlan_id = vlan_dev_vlan_id(lower_dev); 1892 return 1; 1893 } 1894 1895 return 0; 1896 } 1897 1898 /* Determine vlan of internal TCP socket. */ 1899 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1900 { 1901 struct netdev_nested_priv priv; 1902 struct net_device *ndev; 1903 struct dst_entry *dst; 1904 int rc = 0; 1905 1906 ini->vlan_id = 0; 1907 1908 rcu_read_lock(); 1909 1910 dst = __sk_dst_get(clcsock->sk); 1911 ndev = dst ? dst_dev_rcu(dst) : NULL; 1912 if (!ndev) { 1913 rc = -ENODEV; 1914 goto out; 1915 } 1916 1917 if (is_vlan_dev(ndev)) { 1918 ini->vlan_id = vlan_dev_vlan_id(ndev); 1919 goto out; 1920 } 1921 1922 priv.data = (void *)&ini->vlan_id; 1923 netdev_walk_all_lower_dev_rcu(ndev, smc_vlan_by_tcpsk_walk, &priv); 1924 out: 1925 rcu_read_unlock(); 1926 1927 return rc; 1928 } 1929 1930 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1931 u8 peer_systemid[], 1932 u8 peer_gid[], 1933 u8 peer_mac_v1[], 1934 enum smc_lgr_role role, u32 clcqpn, 1935 struct net *net) 1936 { 1937 struct smc_link *lnk; 1938 int i; 1939 1940 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1941 lgr->role != role) 1942 return false; 1943 1944 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1945 lnk = &lgr->lnk[i]; 1946 1947 if (!smc_link_active(lnk)) 1948 continue; 1949 /* use verbs API to check netns, instead of lgr->net */ 1950 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1951 return false; 1952 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1953 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1954 (smcr_version == SMC_V2 || 1955 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1956 return true; 1957 } 1958 return false; 1959 } 1960 1961 static bool smcd_lgr_match(struct smc_link_group *lgr, 1962 struct smcd_dev *smcismdev, 1963 struct smcd_gid *peer_gid) 1964 { 1965 if (lgr->peer_gid.gid != peer_gid->gid || 1966 lgr->smcd != smcismdev) 1967 return false; 1968 1969 if (smc_ism_is_emulated(smcismdev) && 1970 lgr->peer_gid.gid_ext != peer_gid->gid_ext) 1971 return false; 1972 1973 return true; 1974 } 1975 1976 /* create a new SMC connection (and a new link group if necessary) */ 1977 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1978 { 1979 struct smc_connection *conn = &smc->conn; 1980 struct net *net = sock_net(&smc->sk); 1981 struct list_head *lgr_list; 1982 struct smc_link_group *lgr; 1983 enum smc_lgr_role role; 1984 spinlock_t *lgr_lock; 1985 int rc = 0; 1986 1987 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1988 &smc_lgr_list.list; 1989 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1990 &smc_lgr_list.lock; 1991 ini->first_contact_local = 1; 1992 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1993 if (role == SMC_CLNT && ini->first_contact_peer) 1994 /* create new link group as well */ 1995 goto create; 1996 1997 /* determine if an existing link group can be reused */ 1998 spin_lock_bh(lgr_lock); 1999 list_for_each_entry(lgr, lgr_list, list) { 2000 write_lock_bh(&lgr->conns_lock); 2001 if ((ini->is_smcd ? 2002 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 2003 &ini->ism_peer_gid[ini->ism_selected]) : 2004 smcr_lgr_match(lgr, ini->smcr_version, 2005 ini->peer_systemid, 2006 ini->peer_gid, ini->peer_mac, role, 2007 ini->ib_clcqpn, net)) && 2008 !lgr->sync_err && 2009 (ini->smcd_version == SMC_V2 || 2010 lgr->vlan_id == ini->vlan_id) && 2011 (role == SMC_CLNT || ini->is_smcd || 2012 (lgr->conns_num < lgr->max_conns && 2013 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 2014 /* link group found */ 2015 ini->first_contact_local = 0; 2016 conn->lgr = lgr; 2017 rc = smc_lgr_register_conn(conn, false); 2018 write_unlock_bh(&lgr->conns_lock); 2019 if (!rc && delayed_work_pending(&lgr->free_work)) 2020 cancel_delayed_work(&lgr->free_work); 2021 break; 2022 } 2023 write_unlock_bh(&lgr->conns_lock); 2024 } 2025 spin_unlock_bh(lgr_lock); 2026 if (rc) 2027 return rc; 2028 2029 if (role == SMC_CLNT && !ini->first_contact_peer && 2030 ini->first_contact_local) { 2031 /* Server reuses a link group, but Client wants to start 2032 * a new one 2033 * send out_of_sync decline, reason synchr. error 2034 */ 2035 return SMC_CLC_DECL_SYNCERR; 2036 } 2037 2038 create: 2039 if (ini->first_contact_local) { 2040 rc = smc_lgr_create(smc, ini); 2041 if (rc) 2042 goto out; 2043 lgr = conn->lgr; 2044 write_lock_bh(&lgr->conns_lock); 2045 rc = smc_lgr_register_conn(conn, true); 2046 write_unlock_bh(&lgr->conns_lock); 2047 if (rc) { 2048 smc_lgr_cleanup_early(lgr); 2049 goto out; 2050 } 2051 } 2052 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 2053 if (!conn->lgr->is_smcd) 2054 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 2055 conn->freed = 0; 2056 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 2057 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 2058 conn->urg_state = SMC_URG_READ; 2059 init_waitqueue_head(&conn->cdc_pend_tx_wq); 2060 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 2061 if (ini->is_smcd) { 2062 conn->rx_off = sizeof(struct smcd_cdc_msg); 2063 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 2064 } else { 2065 conn->rx_off = 0; 2066 } 2067 #ifndef KERNEL_HAS_ATOMIC64 2068 spin_lock_init(&conn->acurs_lock); 2069 #endif 2070 2071 out: 2072 return rc; 2073 } 2074 2075 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 2076 #define SMCR_RMBE_SIZES 15 /* 0 -> 16KB, 1 -> 32KB, .. 15 -> 512MB */ 2077 2078 /* convert the RMB size into the compressed notation (minimum 16K, see 2079 * SMCD/R_DMBE_SIZES. 2080 * In contrast to plain ilog2, this rounds towards the next power of 2, 2081 * so the socket application gets at least its desired sndbuf / rcvbuf size. 2082 */ 2083 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 2084 { 2085 u8 compressed; 2086 2087 if (size <= SMC_BUF_MIN_SIZE) 2088 return 0; 2089 2090 size = (size - 1) >> 14; /* convert to 16K multiple */ 2091 compressed = min_t(u8, ilog2(size) + 1, 2092 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 2093 2094 #ifdef CONFIG_ARCH_NO_SG_CHAIN 2095 if (!is_smcd && is_rmb) 2096 /* RMBs are backed by & limited to max size of scatterlists */ 2097 compressed = min_t(u8, compressed, ilog2((SG_MAX_SINGLE_ALLOC * PAGE_SIZE) >> 14)); 2098 #endif 2099 2100 return compressed; 2101 } 2102 2103 /* convert the RMB size from compressed notation into integer */ 2104 int smc_uncompress_bufsize(u8 compressed) 2105 { 2106 u32 size; 2107 2108 size = 0x00000001 << (((int)compressed) + 14); 2109 return (int)size; 2110 } 2111 2112 /* try to reuse a sndbuf or rmb description slot for a certain 2113 * buffer size; if not available, return NULL 2114 */ 2115 static struct smc_buf_desc *smc_buf_get_slot(struct rw_semaphore *lock, 2116 struct list_head *buf_list) 2117 { 2118 struct smc_buf_desc *buf_slot; 2119 2120 down_read(lock); 2121 list_for_each_entry(buf_slot, buf_list, list) { 2122 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 2123 up_read(lock); 2124 return buf_slot; 2125 } 2126 } 2127 up_read(lock); 2128 return NULL; 2129 } 2130 2131 /* one of the conditions for announcing a receiver's current window size is 2132 * that it "results in a minimum increase in the window size of 10% of the 2133 * receive buffer space" [RFC7609] 2134 */ 2135 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2136 { 2137 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2138 } 2139 2140 /* map an buf to a link */ 2141 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2142 struct smc_link *lnk) 2143 { 2144 int rc, i, nents, offset, buf_size, size, access_flags; 2145 struct scatterlist *sg; 2146 void *buf; 2147 2148 if (buf_desc->is_map_ib[lnk->link_idx]) 2149 return 0; 2150 2151 if (buf_desc->is_vm) { 2152 buf = buf_desc->cpu_addr; 2153 buf_size = buf_desc->len; 2154 offset = offset_in_page(buf_desc->cpu_addr); 2155 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2156 } else { 2157 nents = 1; 2158 } 2159 2160 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2161 if (rc) 2162 return rc; 2163 2164 if (buf_desc->is_vm) { 2165 /* virtually contiguous buffer */ 2166 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2167 size = min_t(int, PAGE_SIZE - offset, buf_size); 2168 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2169 buf += size; 2170 buf_size -= size; 2171 offset = 0; 2172 } 2173 } else { 2174 /* physically contiguous buffer */ 2175 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2176 buf_desc->cpu_addr, buf_desc->len); 2177 } 2178 2179 /* map sg table to DMA address */ 2180 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2181 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2182 /* SMC protocol depends on mapping to one DMA address only */ 2183 if (rc != nents) { 2184 rc = -EAGAIN; 2185 goto free_table; 2186 } 2187 2188 buf_desc->is_dma_need_sync |= 2189 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2190 2191 if (is_rmb || buf_desc->is_vm) { 2192 /* create a new memory region for the RMB or vzalloced sndbuf */ 2193 access_flags = is_rmb ? 2194 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2195 IB_ACCESS_LOCAL_WRITE; 2196 2197 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2198 buf_desc, lnk->link_idx); 2199 if (rc) 2200 goto buf_unmap; 2201 smc_ib_sync_sg_for_device(lnk, buf_desc, 2202 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2203 } 2204 buf_desc->is_map_ib[lnk->link_idx] = true; 2205 return 0; 2206 2207 buf_unmap: 2208 smc_ib_buf_unmap_sg(lnk, buf_desc, 2209 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2210 free_table: 2211 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2212 return rc; 2213 } 2214 2215 /* register a new buf on IB device, rmb or vzalloced sndbuf 2216 * must be called under lgr->llc_conf_mutex lock 2217 */ 2218 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2219 { 2220 if (list_empty(&link->lgr->list)) 2221 return -ENOLINK; 2222 if (!buf_desc->is_reg_mr[link->link_idx]) { 2223 /* register memory region for new buf */ 2224 if (buf_desc->is_vm) 2225 buf_desc->mr[link->link_idx]->iova = 2226 (uintptr_t)buf_desc->cpu_addr; 2227 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2228 buf_desc->is_reg_err = true; 2229 return -EFAULT; 2230 } 2231 buf_desc->is_reg_mr[link->link_idx] = true; 2232 } 2233 return 0; 2234 } 2235 2236 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct rw_semaphore *lock, 2237 struct list_head *lst, bool is_rmb) 2238 { 2239 struct smc_buf_desc *buf_desc, *bf; 2240 int rc = 0; 2241 2242 down_write(lock); 2243 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2244 if (!buf_desc->used) 2245 continue; 2246 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2247 if (rc) 2248 goto out; 2249 } 2250 out: 2251 up_write(lock); 2252 return rc; 2253 } 2254 2255 /* map all used buffers of lgr for a new link */ 2256 int smcr_buf_map_lgr(struct smc_link *lnk) 2257 { 2258 struct smc_link_group *lgr = lnk->lgr; 2259 int i, rc = 0; 2260 2261 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2262 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2263 &lgr->rmbs[i], true); 2264 if (rc) 2265 return rc; 2266 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2267 &lgr->sndbufs[i], false); 2268 if (rc) 2269 return rc; 2270 } 2271 return 0; 2272 } 2273 2274 /* register all used buffers of lgr for a new link, 2275 * must be called under lgr->llc_conf_mutex lock 2276 */ 2277 int smcr_buf_reg_lgr(struct smc_link *lnk) 2278 { 2279 struct smc_link_group *lgr = lnk->lgr; 2280 struct smc_buf_desc *buf_desc, *bf; 2281 int i, rc = 0; 2282 2283 /* reg all RMBs for a new link */ 2284 down_write(&lgr->rmbs_lock); 2285 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2286 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2287 if (!buf_desc->used) 2288 continue; 2289 rc = smcr_link_reg_buf(lnk, buf_desc); 2290 if (rc) { 2291 up_write(&lgr->rmbs_lock); 2292 return rc; 2293 } 2294 } 2295 } 2296 up_write(&lgr->rmbs_lock); 2297 2298 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2299 return rc; 2300 2301 /* reg all vzalloced sndbufs for a new link */ 2302 down_write(&lgr->sndbufs_lock); 2303 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2304 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2305 if (!buf_desc->used || !buf_desc->is_vm) 2306 continue; 2307 rc = smcr_link_reg_buf(lnk, buf_desc); 2308 if (rc) { 2309 up_write(&lgr->sndbufs_lock); 2310 return rc; 2311 } 2312 } 2313 } 2314 up_write(&lgr->sndbufs_lock); 2315 return rc; 2316 } 2317 2318 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2319 int bufsize) 2320 { 2321 struct smc_buf_desc *buf_desc; 2322 2323 /* try to alloc a new buffer */ 2324 buf_desc = kzalloc_obj(*buf_desc); 2325 if (!buf_desc) 2326 return ERR_PTR(-ENOMEM); 2327 2328 switch (lgr->buf_type) { 2329 case SMCR_PHYS_CONT_BUFS: 2330 case SMCR_MIXED_BUFS: 2331 buf_desc->order = get_order(bufsize); 2332 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2333 __GFP_NOMEMALLOC | __GFP_COMP | 2334 __GFP_NORETRY | __GFP_ZERO, 2335 buf_desc->order); 2336 if (buf_desc->pages) { 2337 buf_desc->cpu_addr = 2338 (void *)page_address(buf_desc->pages); 2339 buf_desc->len = bufsize; 2340 buf_desc->is_vm = false; 2341 break; 2342 } 2343 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2344 goto out; 2345 fallthrough; // try virtually contiguous buf 2346 case SMCR_VIRT_CONT_BUFS: 2347 buf_desc->order = get_order(bufsize); 2348 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2349 if (!buf_desc->cpu_addr) 2350 goto out; 2351 buf_desc->pages = NULL; 2352 buf_desc->len = bufsize; 2353 buf_desc->is_vm = true; 2354 break; 2355 } 2356 return buf_desc; 2357 2358 out: 2359 kfree(buf_desc); 2360 return ERR_PTR(-EAGAIN); 2361 } 2362 2363 /* map buf_desc on all usable links, 2364 * unused buffers stay mapped as long as the link is up 2365 */ 2366 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2367 struct smc_buf_desc *buf_desc, bool is_rmb) 2368 { 2369 int i, rc = 0, cnt = 0; 2370 2371 /* protect against parallel link reconfiguration */ 2372 down_read(&lgr->llc_conf_mutex); 2373 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2374 struct smc_link *lnk = &lgr->lnk[i]; 2375 2376 if (!smc_link_usable(lnk)) 2377 continue; 2378 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2379 rc = -ENOMEM; 2380 goto out; 2381 } 2382 cnt++; 2383 } 2384 out: 2385 up_read(&lgr->llc_conf_mutex); 2386 if (!rc && !cnt) 2387 rc = -EINVAL; 2388 return rc; 2389 } 2390 2391 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2392 bool is_dmb, int bufsize) 2393 { 2394 struct smc_buf_desc *buf_desc; 2395 int rc; 2396 2397 /* try to alloc a new DMB */ 2398 buf_desc = kzalloc_obj(*buf_desc); 2399 if (!buf_desc) 2400 return ERR_PTR(-ENOMEM); 2401 if (is_dmb) { 2402 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2403 if (rc) { 2404 kfree(buf_desc); 2405 if (rc == -ENOMEM) 2406 return ERR_PTR(-EAGAIN); 2407 if (rc == -ENOSPC) 2408 return ERR_PTR(-ENOSPC); 2409 return ERR_PTR(-EIO); 2410 } 2411 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2412 /* CDC header stored in buf. So, pretend it was smaller */ 2413 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2414 } else { 2415 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2416 __GFP_NOWARN | __GFP_NORETRY | 2417 __GFP_NOMEMALLOC); 2418 if (!buf_desc->cpu_addr) { 2419 kfree(buf_desc); 2420 return ERR_PTR(-EAGAIN); 2421 } 2422 buf_desc->len = bufsize; 2423 } 2424 return buf_desc; 2425 } 2426 2427 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2428 { 2429 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2430 struct smc_connection *conn = &smc->conn; 2431 struct smc_link_group *lgr = conn->lgr; 2432 struct list_head *buf_list; 2433 int bufsize, bufsize_comp; 2434 struct rw_semaphore *lock; /* lock buffer list */ 2435 bool is_dgraded = false; 2436 2437 if (is_rmb) 2438 /* use socket recv buffer size (w/o overhead) as start value */ 2439 bufsize = smc->sk.sk_rcvbuf / 2; 2440 else 2441 /* use socket send buffer size (w/o overhead) as start value */ 2442 bufsize = smc->sk.sk_sndbuf / 2; 2443 2444 /* limit bufsize for physically contiguous buffers */ 2445 if (!is_smcd && lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2446 bufsize = min_t(int, bufsize, PAGE_SIZE << MAX_PAGE_ORDER); 2447 2448 for (bufsize_comp = smc_compress_bufsize(bufsize, is_smcd, is_rmb); 2449 bufsize_comp >= 0; bufsize_comp--) { 2450 if (is_rmb) { 2451 lock = &lgr->rmbs_lock; 2452 buf_list = &lgr->rmbs[bufsize_comp]; 2453 } else { 2454 lock = &lgr->sndbufs_lock; 2455 buf_list = &lgr->sndbufs[bufsize_comp]; 2456 } 2457 bufsize = smc_uncompress_bufsize(bufsize_comp); 2458 2459 /* check for reusable slot in the link group */ 2460 buf_desc = smc_buf_get_slot(lock, buf_list); 2461 if (buf_desc) { 2462 buf_desc->is_dma_need_sync = 0; 2463 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, true, bufsize); 2464 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2465 break; /* found reusable slot */ 2466 } 2467 2468 if (is_smcd) 2469 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2470 else 2471 buf_desc = smcr_new_buf_create(lgr, bufsize); 2472 2473 if (PTR_ERR(buf_desc) == -ENOMEM) 2474 break; 2475 if (IS_ERR(buf_desc)) { 2476 if (!is_dgraded) { 2477 is_dgraded = true; 2478 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2479 } 2480 continue; 2481 } 2482 2483 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2484 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, true, bufsize); 2485 buf_desc->used = 1; 2486 down_write(lock); 2487 smc_lgr_buf_list_add(lgr, is_rmb, buf_list, buf_desc); 2488 up_write(lock); 2489 break; /* found */ 2490 } 2491 2492 if (IS_ERR(buf_desc)) 2493 return PTR_ERR(buf_desc); 2494 2495 if (!is_smcd) { 2496 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2497 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2498 return -ENOMEM; 2499 } 2500 } 2501 2502 if (is_rmb) { 2503 conn->rmb_desc = buf_desc; 2504 conn->rmbe_size_comp = bufsize_comp; 2505 smc->sk.sk_rcvbuf = bufsize * 2; 2506 atomic_set(&conn->bytes_to_rcv, 0); 2507 conn->rmbe_update_limit = 2508 smc_rmb_wnd_update_limit(buf_desc->len); 2509 if (is_smcd) 2510 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2511 } else { 2512 conn->sndbuf_desc = buf_desc; 2513 smc->sk.sk_sndbuf = bufsize * 2; 2514 atomic_set(&conn->sndbuf_space, bufsize); 2515 } 2516 return 0; 2517 } 2518 2519 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2520 { 2521 if (!conn->sndbuf_desc->is_dma_need_sync) 2522 return; 2523 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2524 !smc_link_active(conn->lnk)) 2525 return; 2526 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2527 } 2528 2529 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2530 { 2531 int i; 2532 2533 if (!conn->rmb_desc->is_dma_need_sync) 2534 return; 2535 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2536 return; 2537 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2538 if (!smc_link_active(&conn->lgr->lnk[i])) 2539 continue; 2540 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2541 DMA_FROM_DEVICE); 2542 } 2543 } 2544 2545 /* create the send and receive buffer for an SMC socket; 2546 * receive buffers are called RMBs; 2547 * (even though the SMC protocol allows more than one RMB-element per RMB, 2548 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2549 * extra RMB for every connection in a link group 2550 */ 2551 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2552 { 2553 int rc; 2554 2555 /* create send buffer */ 2556 if (is_smcd && 2557 smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) 2558 goto create_rmb; 2559 2560 rc = __smc_buf_create(smc, is_smcd, false); 2561 if (rc) 2562 return rc; 2563 2564 create_rmb: 2565 /* create rmb */ 2566 rc = __smc_buf_create(smc, is_smcd, true); 2567 if (rc && smc->conn.sndbuf_desc) { 2568 down_write(&smc->conn.lgr->sndbufs_lock); 2569 smc_lgr_buf_list_del(smc->conn.lgr, false, 2570 smc->conn.sndbuf_desc); 2571 up_write(&smc->conn.lgr->sndbufs_lock); 2572 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2573 smc->conn.sndbuf_desc = NULL; 2574 } 2575 return rc; 2576 } 2577 2578 int smcd_buf_attach(struct smc_sock *smc) 2579 { 2580 struct smc_connection *conn = &smc->conn; 2581 struct smcd_dev *smcd = conn->lgr->smcd; 2582 u64 peer_token = conn->peer_token; 2583 struct smc_buf_desc *buf_desc; 2584 int rc; 2585 2586 buf_desc = kzalloc_obj(*buf_desc); 2587 if (!buf_desc) 2588 return -ENOMEM; 2589 2590 /* The ghost sndbuf_desc describes the same memory region as 2591 * peer RMB. Its lifecycle is consistent with the connection's 2592 * and it will be freed with the connections instead of the 2593 * link group. 2594 */ 2595 rc = smc_ism_attach_dmb(smcd, peer_token, buf_desc); 2596 if (rc) 2597 goto free; 2598 2599 smc->sk.sk_sndbuf = buf_desc->len; 2600 buf_desc->cpu_addr = 2601 (u8 *)buf_desc->cpu_addr + sizeof(struct smcd_cdc_msg); 2602 buf_desc->len -= sizeof(struct smcd_cdc_msg); 2603 conn->sndbuf_desc = buf_desc; 2604 conn->sndbuf_desc->used = 1; 2605 atomic_set(&conn->sndbuf_space, conn->sndbuf_desc->len); 2606 return 0; 2607 2608 free: 2609 kfree(buf_desc); 2610 return rc; 2611 } 2612 2613 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2614 { 2615 int i; 2616 2617 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2618 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2619 return i; 2620 } 2621 return -ENOSPC; 2622 } 2623 2624 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2625 u32 rkey) 2626 { 2627 int i; 2628 2629 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2630 if (test_bit(i, lgr->rtokens_used_mask) && 2631 lgr->rtokens[i][lnk_idx].rkey == rkey) 2632 return i; 2633 } 2634 return -ENOENT; 2635 } 2636 2637 /* set rtoken for a new link to an existing rmb */ 2638 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2639 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2640 { 2641 int rtok_idx; 2642 2643 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2644 if (rtok_idx == -ENOENT) 2645 return; 2646 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2647 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2648 } 2649 2650 /* set rtoken for a new link whose link_id is given */ 2651 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2652 __be64 nw_vaddr, __be32 nw_rkey) 2653 { 2654 u64 dma_addr = be64_to_cpu(nw_vaddr); 2655 u32 rkey = ntohl(nw_rkey); 2656 bool found = false; 2657 int link_idx; 2658 2659 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2660 if (lgr->lnk[link_idx].link_id == link_id) { 2661 found = true; 2662 break; 2663 } 2664 } 2665 if (!found) 2666 return; 2667 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2668 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2669 } 2670 2671 /* add a new rtoken from peer */ 2672 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2673 { 2674 struct smc_link_group *lgr = smc_get_lgr(lnk); 2675 u64 dma_addr = be64_to_cpu(nw_vaddr); 2676 u32 rkey = ntohl(nw_rkey); 2677 int i; 2678 2679 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2680 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2681 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2682 test_bit(i, lgr->rtokens_used_mask)) { 2683 /* already in list */ 2684 return i; 2685 } 2686 } 2687 i = smc_rmb_reserve_rtoken_idx(lgr); 2688 if (i < 0) 2689 return i; 2690 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2691 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2692 return i; 2693 } 2694 2695 /* delete an rtoken from all links */ 2696 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2697 { 2698 struct smc_link_group *lgr = smc_get_lgr(lnk); 2699 u32 rkey = ntohl(nw_rkey); 2700 int i, j; 2701 2702 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2703 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2704 test_bit(i, lgr->rtokens_used_mask)) { 2705 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2706 lgr->rtokens[i][j].rkey = 0; 2707 lgr->rtokens[i][j].dma_addr = 0; 2708 } 2709 clear_bit(i, lgr->rtokens_used_mask); 2710 return 0; 2711 } 2712 } 2713 return -ENOENT; 2714 } 2715 2716 /* save rkey and dma_addr received from peer during clc handshake */ 2717 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2718 struct smc_link *lnk, 2719 struct smc_clc_msg_accept_confirm *clc) 2720 { 2721 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2722 clc->r0.rmb_rkey); 2723 if (conn->rtoken_idx < 0) 2724 return conn->rtoken_idx; 2725 return 0; 2726 } 2727 2728 static void smc_core_going_away(void) 2729 { 2730 struct smc_ib_device *smcibdev; 2731 struct smcd_dev *smcd; 2732 2733 mutex_lock(&smc_ib_devices.mutex); 2734 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2735 int i; 2736 2737 for (i = 0; i < SMC_MAX_PORTS; i++) 2738 set_bit(i, smcibdev->ports_going_away); 2739 } 2740 mutex_unlock(&smc_ib_devices.mutex); 2741 2742 mutex_lock(&smcd_dev_list.mutex); 2743 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2744 smcd->going_away = 1; 2745 } 2746 mutex_unlock(&smcd_dev_list.mutex); 2747 } 2748 2749 /* Clean up all SMC link groups */ 2750 static void smc_lgrs_shutdown(void) 2751 { 2752 struct smcd_dev *smcd; 2753 2754 smc_core_going_away(); 2755 2756 smc_smcr_terminate_all(NULL); 2757 2758 mutex_lock(&smcd_dev_list.mutex); 2759 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2760 smc_smcd_terminate_all(smcd); 2761 mutex_unlock(&smcd_dev_list.mutex); 2762 } 2763 2764 static int smc_core_reboot_event(struct notifier_block *this, 2765 unsigned long event, void *ptr) 2766 { 2767 smc_lgrs_shutdown(); 2768 smc_ib_unregister_client(); 2769 smc_ism_exit(); 2770 return 0; 2771 } 2772 2773 static struct notifier_block smc_reboot_notifier = { 2774 .notifier_call = smc_core_reboot_event, 2775 }; 2776 2777 int __init smc_core_init(void) 2778 { 2779 return register_reboot_notifier(&smc_reboot_notifier); 2780 } 2781 2782 /* Called (from smc_exit) when module is removed */ 2783 void smc_core_exit(void) 2784 { 2785 unregister_reboot_notifier(&smc_reboot_notifier); 2786 smc_lgrs_shutdown(); 2787 } 2788