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