net/smc/smc_core.c

   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
  37 #define SMC_LGR_NUM_INCR                256
  38 #define SMC_LGR_FREE_DELAY_SERV         (600 * HZ)
  39 #define SMC_LGR_FREE_DELAY_CLNT         (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
  40
  41 struct smc_lgr_list smc_lgr_list = {    /* established link groups */
  42         .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
  43         .list = LIST_HEAD_INIT(smc_lgr_list.list),
  44         .num = 0,
  45 };
  46
  47 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
  48 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
  49
  50 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
  51                          struct smc_buf_desc *buf_desc);
  52 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
  53
  54 static void smc_link_down_work(struct work_struct *work);
  55
  56 /* return head of link group list and its lock for a given link group */
  57 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
  58                                                   spinlock_t **lgr_lock)
  59 {
  60         if (lgr->is_smcd) {
  61                 *lgr_lock = &lgr->smcd->lgr_lock;
  62                 return &lgr->smcd->lgr_list;
  63         }
  64
  65         *lgr_lock = &smc_lgr_list.lock;
  66         return &smc_lgr_list.list;
  67 }
  68
  69 static void smc_ibdev_cnt_inc(struct smc_link *lnk)
  70 {
  71         atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
  72 }
  73
  74 static void smc_ibdev_cnt_dec(struct smc_link *lnk)
  75 {
  76         atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
  77 }
  78
  79 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
  80 {
  81         /* client link group creation always follows the server link group
  82          * creation. For client use a somewhat higher removal delay time,
  83          * otherwise there is a risk of out-of-sync link groups.
  84          */
  85         if (!lgr->freeing) {
  86                 mod_delayed_work(system_wq, &lgr->free_work,
  87                                  (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
  88                                                 SMC_LGR_FREE_DELAY_CLNT :
  89                                                 SMC_LGR_FREE_DELAY_SERV);
  90         }
  91 }
  92
  93 /* Register connection's alert token in our lookup structure.
  94  * To use rbtrees we have to implement our own insert core.
  95  * Requires @conns_lock
  96  * @smc         connection to register
  97  * Returns 0 on success, != otherwise.
  98  */
  99 static void smc_lgr_add_alert_token(struct smc_connection *conn)
 100 {
 101         struct rb_node **link, *parent = NULL;
 102         u32 token = conn->alert_token_local;
 103
 104         link = &conn->lgr->conns_all.rb_node;
 105         while (*link) {
 106                 struct smc_connection *cur = rb_entry(*link,
 107                                         struct smc_connection, alert_node);
 108
 109                 parent = *link;
 110                 if (cur->alert_token_local > token)
 111                         link = &parent->rb_left;
 112                 else
 113                         link = &parent->rb_right;
 114         }
 115         /* Put the new node there */
 116         rb_link_node(&conn->alert_node, parent, link);
 117         rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
 118 }
 119
 120 /* assign an SMC-R link to the connection */
 121 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
 122 {
 123         enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
 124                                        SMC_LNK_ACTIVE;
 125         int i, j;
 126
 127         /* do link balancing */
 128         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 129                 struct smc_link *lnk = &conn->lgr->lnk[i];
 130
 131                 if (lnk->state != expected || lnk->link_is_asym)
 132                         continue;
 133                 if (conn->lgr->role == SMC_CLNT) {
 134                         conn->lnk = lnk; /* temporary, SMC server assigns link*/
 135                         break;
 136                 }
 137                 if (conn->lgr->conns_num % 2) {
 138                         for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
 139                                 struct smc_link *lnk2;
 140
 141                                 lnk2 = &conn->lgr->lnk[j];
 142                                 if (lnk2->state == expected &&
 143                                     !lnk2->link_is_asym) {
 144                                         conn->lnk = lnk2;
 145                                         break;
 146                                 }
 147                         }
 148                 }
 149                 if (!conn->lnk)
 150                         conn->lnk = lnk;
 151                 break;
 152         }
 153         if (!conn->lnk)
 154                 return SMC_CLC_DECL_NOACTLINK;
 155         atomic_inc(&conn->lnk->conn_cnt);
 156         return 0;
 157 }
 158
 159 /* Register connection in link group by assigning an alert token
 160  * registered in a search tree.
 161  * Requires @conns_lock
 162  * Note that '0' is a reserved value and not assigned.
 163  */
 164 static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
 165 {
 166         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 167         static atomic_t nexttoken = ATOMIC_INIT(0);
 168         int rc;
 169
 170         if (!conn->lgr->is_smcd) {
 171                 rc = smcr_lgr_conn_assign_link(conn, first);
 172                 if (rc)
 173                         return rc;
 174         }
 175         /* find a new alert_token_local value not yet used by some connection
 176          * in this link group
 177          */
 178         sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
 179         while (!conn->alert_token_local) {
 180                 conn->alert_token_local = atomic_inc_return(&nexttoken);
 181                 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
 182                         conn->alert_token_local = 0;
 183         }
 184         smc_lgr_add_alert_token(conn);
 185         conn->lgr->conns_num++;
 186         return 0;
 187 }
 188
 189 /* Unregister connection and reset the alert token of the given connection<
 190  */
 191 static void __smc_lgr_unregister_conn(struct smc_connection *conn)
 192 {
 193         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 194         struct smc_link_group *lgr = conn->lgr;
 195
 196         rb_erase(&conn->alert_node, &lgr->conns_all);
 197         if (conn->lnk)
 198                 atomic_dec(&conn->lnk->conn_cnt);
 199         lgr->conns_num--;
 200         conn->alert_token_local = 0;
 201         sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
 202 }
 203
 204 /* Unregister connection from lgr
 205  */
 206 static void smc_lgr_unregister_conn(struct smc_connection *conn)
 207 {
 208         struct smc_link_group *lgr = conn->lgr;
 209
 210         if (!lgr)
 211                 return;
 212         write_lock_bh(&lgr->conns_lock);
 213         if (conn->alert_token_local) {
 214                 __smc_lgr_unregister_conn(conn);
 215         }
 216         write_unlock_bh(&lgr->conns_lock);
 217         conn->lgr = NULL;
 218 }
 219
 220 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
 221 {
 222         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 223         char hostname[SMC_MAX_HOSTNAME_LEN + 1];
 224         char smc_seid[SMC_MAX_EID_LEN + 1];
 225         struct smcd_dev *smcd_dev;
 226         struct nlattr *attrs;
 227         u8 *seid = NULL;
 228         u8 *host = NULL;
 229         void *nlh;
 230
 231         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 232                           &smc_gen_nl_family, NLM_F_MULTI,
 233                           SMC_NETLINK_GET_SYS_INFO);
 234         if (!nlh)
 235                 goto errmsg;
 236         if (cb_ctx->pos[0])
 237                 goto errout;
 238         attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
 239         if (!attrs)
 240                 goto errout;
 241         if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
 242                 goto errattr;
 243         if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
 244                 goto errattr;
 245         if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
 246                 goto errattr;
 247         smc_clc_get_hostname(&host);
 248         if (host) {
 249                 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
 250                 hostname[SMC_MAX_HOSTNAME_LEN] = 0;
 251                 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
 252                         goto errattr;
 253         }
 254         mutex_lock(&smcd_dev_list.mutex);
 255         smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
 256                                             struct smcd_dev, list);
 257         if (smcd_dev)
 258                 smc_ism_get_system_eid(smcd_dev, &seid);
 259         mutex_unlock(&smcd_dev_list.mutex);
 260         if (seid && smc_ism_is_v2_capable()) {
 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
 271 errattr:
 272         nla_nest_cancel(skb, attrs);
 273 errout:
 274         genlmsg_cancel(skb, nlh);
 275 errmsg:
 276         return skb->len;
 277 }
 278
 279 static int smc_nl_fill_lgr(struct smc_link_group *lgr,
 280                            struct sk_buff *skb,
 281                            struct netlink_callback *cb)
 282 {
 283         char smc_target[SMC_MAX_PNETID_LEN + 1];
 284         struct nlattr *attrs;
 285
 286         attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
 287         if (!attrs)
 288                 goto errout;
 289
 290         if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
 291                 goto errattr;
 292         if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
 293                 goto errattr;
 294         if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
 295                 goto errattr;
 296         if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
 297                 goto errattr;
 298         if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
 299                 goto errattr;
 300         memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
 301         smc_target[SMC_MAX_PNETID_LEN] = 0;
 302         if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
 303                 goto errattr;
 304
 305         nla_nest_end(skb, attrs);
 306         return 0;
 307 errattr:
 308         nla_nest_cancel(skb, attrs);
 309 errout:
 310         return -EMSGSIZE;
 311 }
 312
 313 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
 314                                 struct smc_link *link,
 315                                 struct sk_buff *skb,
 316                                 struct netlink_callback *cb)
 317 {
 318         char smc_ibname[IB_DEVICE_NAME_MAX];
 319         u8 smc_gid_target[41];
 320         struct nlattr *attrs;
 321         u32 link_uid = 0;
 322         void *nlh;
 323
 324         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 325                           &smc_gen_nl_family, NLM_F_MULTI,
 326                           SMC_NETLINK_GET_LINK_SMCR);
 327         if (!nlh)
 328                 goto errmsg;
 329
 330         attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
 331         if (!attrs)
 332                 goto errout;
 333
 334         if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
 335                 goto errattr;
 336         if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
 337                 goto errattr;
 338         if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
 339                         atomic_read(&link->conn_cnt)))
 340                 goto errattr;
 341         if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
 342                 goto errattr;
 343         if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
 344                 goto errattr;
 345         snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
 346         if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
 347                 goto errattr;
 348         memcpy(&link_uid, link->link_uid, sizeof(link_uid));
 349         if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
 350                 goto errattr;
 351         memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
 352         if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
 353                 goto errattr;
 354         memset(smc_gid_target, 0, sizeof(smc_gid_target));
 355         smc_gid_be16_convert(smc_gid_target, link->gid);
 356         if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
 357                 goto errattr;
 358         memset(smc_gid_target, 0, sizeof(smc_gid_target));
 359         smc_gid_be16_convert(smc_gid_target, link->peer_gid);
 360         if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
 361                 goto errattr;
 362
 363         nla_nest_end(skb, attrs);
 364         genlmsg_end(skb, nlh);
 365         return 0;
 366 errattr:
 367         nla_nest_cancel(skb, attrs);
 368 errout:
 369         genlmsg_cancel(skb, nlh);
 370 errmsg:
 371         return -EMSGSIZE;
 372 }
 373
 374 static int smc_nl_handle_lgr(struct smc_link_group *lgr,
 375                              struct sk_buff *skb,
 376                              struct netlink_callback *cb,
 377                              bool list_links)
 378 {
 379         void *nlh;
 380         int i;
 381
 382         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 383                           &smc_gen_nl_family, NLM_F_MULTI,
 384                           SMC_NETLINK_GET_LGR_SMCR);
 385         if (!nlh)
 386                 goto errmsg;
 387         if (smc_nl_fill_lgr(lgr, skb, cb))
 388                 goto errout;
 389
 390         genlmsg_end(skb, nlh);
 391         if (!list_links)
 392                 goto out;
 393         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 394                 if (!smc_link_usable(&lgr->lnk[i]))
 395                         continue;
 396                 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
 397                         goto errout;
 398         }
 399 out:
 400         return 0;
 401
 402 errout:
 403         genlmsg_cancel(skb, nlh);
 404 errmsg:
 405         return -EMSGSIZE;
 406 }
 407
 408 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
 409                                  struct sk_buff *skb,
 410                                  struct netlink_callback *cb,
 411                                  bool list_links)
 412 {
 413         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 414         struct smc_link_group *lgr;
 415         int snum = cb_ctx->pos[0];
 416         int num = 0;
 417
 418         spin_lock_bh(&smc_lgr->lock);
 419         list_for_each_entry(lgr, &smc_lgr->list, list) {
 420                 if (num < snum)
 421                         goto next;
 422                 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
 423                         goto errout;
 424 next:
 425                 num++;
 426         }
 427 errout:
 428         spin_unlock_bh(&smc_lgr->lock);
 429         cb_ctx->pos[0] = num;
 430 }
 431
 432 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
 433                                 struct sk_buff *skb,
 434                                 struct netlink_callback *cb)
 435 {
 436         char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
 437         char smc_pnet[SMC_MAX_PNETID_LEN + 1];
 438         char smc_eid[SMC_MAX_EID_LEN + 1];
 439         struct nlattr *v2_attrs;
 440         struct nlattr *attrs;
 441         void *nlh;
 442
 443         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 444                           &smc_gen_nl_family, NLM_F_MULTI,
 445                           SMC_NETLINK_GET_LGR_SMCD);
 446         if (!nlh)
 447                 goto errmsg;
 448
 449         attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
 450         if (!attrs)
 451                 goto errout;
 452
 453         if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
 454                 goto errattr;
 455         if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
 456                               SMC_NLA_LGR_D_PAD))
 457                 goto errattr;
 458         if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
 459                               SMC_NLA_LGR_D_PAD))
 460                 goto errattr;
 461         if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
 462                 goto errattr;
 463         if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
 464                 goto errattr;
 465         if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
 466                 goto errattr;
 467         memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
 468         smc_pnet[SMC_MAX_PNETID_LEN] = 0;
 469         if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
 470                 goto errattr;
 471
 472         v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_V2);
 473         if (!v2_attrs)
 474                 goto errattr;
 475         if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
 476                 goto errv2attr;
 477         if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
 478                 goto errv2attr;
 479         if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
 480                 goto errv2attr;
 481         memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN);
 482         smc_host[SMC_MAX_HOSTNAME_LEN] = 0;
 483         if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
 484                 goto errv2attr;
 485         memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN);
 486         smc_eid[SMC_MAX_EID_LEN] = 0;
 487         if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
 488                 goto errv2attr;
 489
 490         nla_nest_end(skb, v2_attrs);
 491         nla_nest_end(skb, attrs);
 492         genlmsg_end(skb, nlh);
 493         return 0;
 494
 495 errv2attr:
 496         nla_nest_cancel(skb, v2_attrs);
 497 errattr:
 498         nla_nest_cancel(skb, attrs);
 499 errout:
 500         genlmsg_cancel(skb, nlh);
 501 errmsg:
 502         return -EMSGSIZE;
 503 }
 504
 505 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
 506                                   struct sk_buff *skb,
 507                                   struct netlink_callback *cb)
 508 {
 509         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 510         struct smc_link_group *lgr;
 511         int snum = cb_ctx->pos[1];
 512         int rc = 0, num = 0;
 513
 514         spin_lock_bh(&dev->lgr_lock);
 515         list_for_each_entry(lgr, &dev->lgr_list, list) {
 516                 if (!lgr->is_smcd)
 517                         continue;
 518                 if (num < snum)
 519                         goto next;
 520                 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
 521                 if (rc)
 522                         goto errout;
 523 next:
 524                 num++;
 525         }
 526 errout:
 527         spin_unlock_bh(&dev->lgr_lock);
 528         cb_ctx->pos[1] = num;
 529         return rc;
 530 }
 531
 532 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
 533                                 struct sk_buff *skb,
 534                                 struct netlink_callback *cb)
 535 {
 536         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 537         struct smcd_dev *smcd_dev;
 538         int snum = cb_ctx->pos[0];
 539         int rc = 0, num = 0;
 540
 541         mutex_lock(&dev_list->mutex);
 542         list_for_each_entry(smcd_dev, &dev_list->list, list) {
 543                 if (list_empty(&smcd_dev->lgr_list))
 544                         continue;
 545                 if (num < snum)
 546                         goto next;
 547                 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
 548                 if (rc)
 549                         goto errout;
 550 next:
 551                 num++;
 552         }
 553 errout:
 554         mutex_unlock(&dev_list->mutex);
 555         cb_ctx->pos[0] = num;
 556         return rc;
 557 }
 558
 559 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
 560 {
 561         bool list_links = false;
 562
 563         smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
 564         return skb->len;
 565 }
 566
 567 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
 568 {
 569         bool list_links = true;
 570
 571         smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
 572         return skb->len;
 573 }
 574
 575 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
 576 {
 577         smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
 578         return skb->len;
 579 }
 580
 581 void smc_lgr_cleanup_early(struct smc_connection *conn)
 582 {
 583         struct smc_link_group *lgr = conn->lgr;
 584         struct list_head *lgr_list;
 585         spinlock_t *lgr_lock;
 586
 587         if (!lgr)
 588                 return;
 589
 590         smc_conn_free(conn);
 591         lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
 592         spin_lock_bh(lgr_lock);
 593         /* do not use this link group for new connections */
 594         if (!list_empty(lgr_list))
 595                 list_del_init(lgr_list);
 596         spin_unlock_bh(lgr_lock);
 597         __smc_lgr_terminate(lgr, true);
 598 }
 599
 600 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
 601 {
 602         int i;
 603
 604         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 605                 struct smc_link *lnk = &lgr->lnk[i];
 606
 607                 if (smc_link_usable(lnk))
 608                         lnk->state = SMC_LNK_INACTIVE;
 609         }
 610         wake_up_all(&lgr->llc_msg_waiter);
 611         wake_up_all(&lgr->llc_flow_waiter);
 612 }
 613
 614 static void smc_lgr_free(struct smc_link_group *lgr);
 615
 616 static void smc_lgr_free_work(struct work_struct *work)
 617 {
 618         struct smc_link_group *lgr = container_of(to_delayed_work(work),
 619                                                   struct smc_link_group,
 620                                                   free_work);
 621         spinlock_t *lgr_lock;
 622         bool conns;
 623
 624         smc_lgr_list_head(lgr, &lgr_lock);
 625         spin_lock_bh(lgr_lock);
 626         if (lgr->freeing) {
 627                 spin_unlock_bh(lgr_lock);
 628                 return;
 629         }
 630         read_lock_bh(&lgr->conns_lock);
 631         conns = RB_EMPTY_ROOT(&lgr->conns_all);
 632         read_unlock_bh(&lgr->conns_lock);
 633         if (!conns) { /* number of lgr connections is no longer zero */
 634                 spin_unlock_bh(lgr_lock);
 635                 return;
 636         }
 637         list_del_init(&lgr->list); /* remove from smc_lgr_list */
 638         lgr->freeing = 1; /* this instance does the freeing, no new schedule */
 639         spin_unlock_bh(lgr_lock);
 640         cancel_delayed_work(&lgr->free_work);
 641
 642         if (!lgr->is_smcd && !lgr->terminating)
 643                 smc_llc_send_link_delete_all(lgr, true,
 644                                              SMC_LLC_DEL_PROG_INIT_TERM);
 645         if (lgr->is_smcd && !lgr->terminating)
 646                 smc_ism_signal_shutdown(lgr);
 647         if (!lgr->is_smcd)
 648                 smcr_lgr_link_deactivate_all(lgr);
 649         smc_lgr_free(lgr);
 650 }
 651
 652 static void smc_lgr_terminate_work(struct work_struct *work)
 653 {
 654         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
 655                                                   terminate_work);
 656
 657         __smc_lgr_terminate(lgr, true);
 658 }
 659
 660 /* return next unique link id for the lgr */
 661 static u8 smcr_next_link_id(struct smc_link_group *lgr)
 662 {
 663         u8 link_id;
 664         int i;
 665
 666         while (1) {
 667                 link_id = ++lgr->next_link_id;
 668                 if (!link_id)   /* skip zero as link_id */
 669                         link_id = ++lgr->next_link_id;
 670                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 671                         if (smc_link_usable(&lgr->lnk[i]) &&
 672                             lgr->lnk[i].link_id == link_id)
 673                                 continue;
 674                 }
 675                 break;
 676         }
 677         return link_id;
 678 }
 679
 680 static void smcr_copy_dev_info_to_link(struct smc_link *link)
 681 {
 682         struct smc_ib_device *smcibdev = link->smcibdev;
 683
 684         snprintf(link->ibname, sizeof(link->ibname), "%s",
 685                  smcibdev->ibdev->name);
 686         link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
 687 }
 688
 689 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
 690                    u8 link_idx, struct smc_init_info *ini)
 691 {
 692         u8 rndvec[3];
 693         int rc;
 694
 695         get_device(&ini->ib_dev->ibdev->dev);
 696         atomic_inc(&ini->ib_dev->lnk_cnt);
 697         lnk->link_id = smcr_next_link_id(lgr);
 698         lnk->lgr = lgr;
 699         lnk->link_idx = link_idx;
 700         lnk->smcibdev = ini->ib_dev;
 701         lnk->ibport = ini->ib_port;
 702         smc_ibdev_cnt_inc(lnk);
 703         smcr_copy_dev_info_to_link(lnk);
 704         lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
 705         atomic_set(&lnk->conn_cnt, 0);
 706         smc_llc_link_set_uid(lnk);
 707         INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
 708         if (!ini->ib_dev->initialized) {
 709                 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
 710                 if (rc)
 711                         goto out;
 712         }
 713         get_random_bytes(rndvec, sizeof(rndvec));
 714         lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
 715                 (rndvec[2] << 16);
 716         rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
 717                                   ini->vlan_id, lnk->gid, &lnk->sgid_index);
 718         if (rc)
 719                 goto out;
 720         rc = smc_llc_link_init(lnk);
 721         if (rc)
 722                 goto out;
 723         rc = smc_wr_alloc_link_mem(lnk);
 724         if (rc)
 725                 goto clear_llc_lnk;
 726         rc = smc_ib_create_protection_domain(lnk);
 727         if (rc)
 728                 goto free_link_mem;
 729         rc = smc_ib_create_queue_pair(lnk);
 730         if (rc)
 731                 goto dealloc_pd;
 732         rc = smc_wr_create_link(lnk);
 733         if (rc)
 734                 goto destroy_qp;
 735         lnk->state = SMC_LNK_ACTIVATING;
 736         return 0;
 737
 738 destroy_qp:
 739         smc_ib_destroy_queue_pair(lnk);
 740 dealloc_pd:
 741         smc_ib_dealloc_protection_domain(lnk);
 742 free_link_mem:
 743         smc_wr_free_link_mem(lnk);
 744 clear_llc_lnk:
 745         smc_llc_link_clear(lnk, false);
 746 out:
 747         smc_ibdev_cnt_dec(lnk);
 748         put_device(&ini->ib_dev->ibdev->dev);
 749         memset(lnk, 0, sizeof(struct smc_link));
 750         lnk->state = SMC_LNK_UNUSED;
 751         if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
 752                 wake_up(&ini->ib_dev->lnks_deleted);
 753         return rc;
 754 }
 755
 756 /* create a new SMC link group */
 757 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 758 {
 759         struct smc_link_group *lgr;
 760         struct list_head *lgr_list;
 761         struct smc_link *lnk;
 762         spinlock_t *lgr_lock;
 763         u8 link_idx;
 764         int rc = 0;
 765         int i;
 766
 767         if (ini->is_smcd && ini->vlan_id) {
 768                 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
 769                                      ini->vlan_id)) {
 770                         rc = SMC_CLC_DECL_ISMVLANERR;
 771                         goto out;
 772                 }
 773         }
 774
 775         lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
 776         if (!lgr) {
 777                 rc = SMC_CLC_DECL_MEM;
 778                 goto ism_put_vlan;
 779         }
 780         lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
 781                                      SMC_LGR_ID_SIZE, &lgr->id);
 782         if (!lgr->tx_wq) {
 783                 rc = -ENOMEM;
 784                 goto free_lgr;
 785         }
 786         lgr->is_smcd = ini->is_smcd;
 787         lgr->sync_err = 0;
 788         lgr->terminating = 0;
 789         lgr->freeing = 0;
 790         lgr->vlan_id = ini->vlan_id;
 791         mutex_init(&lgr->sndbufs_lock);
 792         mutex_init(&lgr->rmbs_lock);
 793         rwlock_init(&lgr->conns_lock);
 794         for (i = 0; i < SMC_RMBE_SIZES; i++) {
 795                 INIT_LIST_HEAD(&lgr->sndbufs[i]);
 796                 INIT_LIST_HEAD(&lgr->rmbs[i]);
 797         }
 798         lgr->next_link_id = 0;
 799         smc_lgr_list.num += SMC_LGR_NUM_INCR;
 800         memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
 801         INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
 802         INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
 803         lgr->conns_all = RB_ROOT;
 804         if (ini->is_smcd) {
 805                 /* SMC-D specific settings */
 806                 get_device(&ini->ism_dev[ini->ism_selected]->dev);
 807                 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
 808                 lgr->smcd = ini->ism_dev[ini->ism_selected];
 809                 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
 810                 lgr_lock = &lgr->smcd->lgr_lock;
 811                 lgr->smc_version = ini->smcd_version;
 812                 lgr->peer_shutdown = 0;
 813                 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
 814         } else {
 815                 /* SMC-R specific settings */
 816                 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
 817                 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
 818                        SMC_SYSTEMID_LEN);
 819                 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
 820                        SMC_MAX_PNETID_LEN);
 821                 smc_llc_lgr_init(lgr, smc);
 822
 823                 link_idx = SMC_SINGLE_LINK;
 824                 lnk = &lgr->lnk[link_idx];
 825                 rc = smcr_link_init(lgr, lnk, link_idx, ini);
 826                 if (rc)
 827                         goto free_wq;
 828                 lgr_list = &smc_lgr_list.list;
 829                 lgr_lock = &smc_lgr_list.lock;
 830                 atomic_inc(&lgr_cnt);
 831         }
 832         smc->conn.lgr = lgr;
 833         spin_lock_bh(lgr_lock);
 834         list_add_tail(&lgr->list, lgr_list);
 835         spin_unlock_bh(lgr_lock);
 836         return 0;
 837
 838 free_wq:
 839         destroy_workqueue(lgr->tx_wq);
 840 free_lgr:
 841         kfree(lgr);
 842 ism_put_vlan:
 843         if (ini->is_smcd && ini->vlan_id)
 844                 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
 845 out:
 846         if (rc < 0) {
 847                 if (rc == -ENOMEM)
 848                         rc = SMC_CLC_DECL_MEM;
 849                 else
 850                         rc = SMC_CLC_DECL_INTERR;
 851         }
 852         return rc;
 853 }
 854
 855 static int smc_write_space(struct smc_connection *conn)
 856 {
 857         int buffer_len = conn->peer_rmbe_size;
 858         union smc_host_cursor prod;
 859         union smc_host_cursor cons;
 860         int space;
 861
 862         smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
 863         smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
 864         /* determine rx_buf space */
 865         space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
 866         return space;
 867 }
 868
 869 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
 870                              struct smc_wr_buf *wr_buf)
 871 {
 872         struct smc_connection *conn = &smc->conn;
 873         union smc_host_cursor cons, fin;
 874         int rc = 0;
 875         int diff;
 876
 877         smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
 878         smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
 879         /* set prod cursor to old state, enforce tx_rdma_writes() */
 880         smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
 881         smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
 882
 883         if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
 884                 /* cons cursor advanced more than fin, and prod was set
 885                  * fin above, so now prod is smaller than cons. Fix that.
 886                  */
 887                 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
 888                 smc_curs_add(conn->sndbuf_desc->len,
 889                              &conn->tx_curs_sent, diff);
 890                 smc_curs_add(conn->sndbuf_desc->len,
 891                              &conn->tx_curs_fin, diff);
 892
 893                 smp_mb__before_atomic();
 894                 atomic_add(diff, &conn->sndbuf_space);
 895                 smp_mb__after_atomic();
 896
 897                 smc_curs_add(conn->peer_rmbe_size,
 898                              &conn->local_tx_ctrl.prod, diff);
 899                 smc_curs_add(conn->peer_rmbe_size,
 900                              &conn->local_tx_ctrl_fin, diff);
 901         }
 902         /* recalculate, value is used by tx_rdma_writes() */
 903         atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
 904
 905         if (smc->sk.sk_state != SMC_INIT &&
 906             smc->sk.sk_state != SMC_CLOSED) {
 907                 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
 908                 if (!rc) {
 909                         queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
 910                         smc->sk.sk_data_ready(&smc->sk);
 911                 }
 912         } else {
 913                 smc_wr_tx_put_slot(conn->lnk,
 914                                    (struct smc_wr_tx_pend_priv *)pend);
 915         }
 916         return rc;
 917 }
 918
 919 static void smc_switch_link_and_count(struct smc_connection *conn,
 920                                       struct smc_link *to_lnk)
 921 {
 922         atomic_dec(&conn->lnk->conn_cnt);
 923         conn->lnk = to_lnk;
 924         atomic_inc(&conn->lnk->conn_cnt);
 925 }
 926
 927 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
 928                                   struct smc_link *from_lnk, bool is_dev_err)
 929 {
 930         struct smc_link *to_lnk = NULL;
 931         struct smc_cdc_tx_pend *pend;
 932         struct smc_connection *conn;
 933         struct smc_wr_buf *wr_buf;
 934         struct smc_sock *smc;
 935         struct rb_node *node;
 936         int i, rc = 0;
 937
 938         /* link is inactive, wake up tx waiters */
 939         smc_wr_wakeup_tx_wait(from_lnk);
 940
 941         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 942                 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
 943                         continue;
 944                 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
 945                     from_lnk->ibport == lgr->lnk[i].ibport) {
 946                         continue;
 947                 }
 948                 to_lnk = &lgr->lnk[i];
 949                 break;
 950         }
 951         if (!to_lnk) {
 952                 smc_lgr_terminate_sched(lgr);
 953                 return NULL;
 954         }
 955 again:
 956         read_lock_bh(&lgr->conns_lock);
 957         for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
 958                 conn = rb_entry(node, struct smc_connection, alert_node);
 959                 if (conn->lnk != from_lnk)
 960                         continue;
 961                 smc = container_of(conn, struct smc_sock, conn);
 962                 /* conn->lnk not yet set in SMC_INIT state */
 963                 if (smc->sk.sk_state == SMC_INIT)
 964                         continue;
 965                 if (smc->sk.sk_state == SMC_CLOSED ||
 966                     smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
 967                     smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
 968                     smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
 969                     smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
 970                     smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
 971                     smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
 972                     smc->sk.sk_state == SMC_PEERABORTWAIT ||
 973                     smc->sk.sk_state == SMC_PROCESSABORT) {
 974                         spin_lock_bh(&conn->send_lock);
 975                         smc_switch_link_and_count(conn, to_lnk);
 976                         spin_unlock_bh(&conn->send_lock);
 977                         continue;
 978                 }
 979                 sock_hold(&smc->sk);
 980                 read_unlock_bh(&lgr->conns_lock);
 981                 /* pre-fetch buffer outside of send_lock, might sleep */
 982                 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
 983                 if (rc) {
 984                         smcr_link_down_cond_sched(to_lnk);
 985                         return NULL;
 986                 }
 987                 /* avoid race with smcr_tx_sndbuf_nonempty() */
 988                 spin_lock_bh(&conn->send_lock);
 989                 smc_switch_link_and_count(conn, to_lnk);
 990                 rc = smc_switch_cursor(smc, pend, wr_buf);
 991                 spin_unlock_bh(&conn->send_lock);
 992                 sock_put(&smc->sk);
 993                 if (rc) {
 994                         smcr_link_down_cond_sched(to_lnk);
 995                         return NULL;
 996                 }
 997                 goto again;
 998         }
 999         read_unlock_bh(&lgr->conns_lock);
1000         return to_lnk;
1001 }
1002
1003 static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
1004                            struct smc_link_group *lgr)
1005 {
1006         int rc;
1007
1008         if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1009                 /* unregister rmb with peer */
1010                 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1011                 if (!rc) {
1012                         /* protect against smc_llc_cli_rkey_exchange() */
1013                         mutex_lock(&lgr->llc_conf_mutex);
1014                         smc_llc_do_delete_rkey(lgr, rmb_desc);
1015                         rmb_desc->is_conf_rkey = false;
1016                         mutex_unlock(&lgr->llc_conf_mutex);
1017                         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1018                 }
1019         }
1020
1021         if (rmb_desc->is_reg_err) {
1022                 /* buf registration failed, reuse not possible */
1023                 mutex_lock(&lgr->rmbs_lock);
1024                 list_del(&rmb_desc->list);
1025                 mutex_unlock(&lgr->rmbs_lock);
1026
1027                 smc_buf_free(lgr, true, rmb_desc);
1028         } else {
1029                 rmb_desc->used = 0;
1030         }
1031 }
1032
1033 static void smc_buf_unuse(struct smc_connection *conn,
1034                           struct smc_link_group *lgr)
1035 {
1036         if (conn->sndbuf_desc)
1037                 conn->sndbuf_desc->used = 0;
1038         if (conn->rmb_desc && lgr->is_smcd)
1039                 conn->rmb_desc->used = 0;
1040         else if (conn->rmb_desc)
1041                 smcr_buf_unuse(conn->rmb_desc, lgr);
1042 }
1043
1044 /* remove a finished connection from its link group */
1045 void smc_conn_free(struct smc_connection *conn)
1046 {
1047         struct smc_link_group *lgr = conn->lgr;
1048
1049         if (!lgr)
1050                 return;
1051         if (lgr->is_smcd) {
1052                 if (!list_empty(&lgr->list))
1053                         smc_ism_unset_conn(conn);
1054                 tasklet_kill(&conn->rx_tsklet);
1055         } else {
1056                 smc_cdc_tx_dismiss_slots(conn);
1057                 if (current_work() != &conn->abort_work)
1058                         cancel_work_sync(&conn->abort_work);
1059         }
1060         if (!list_empty(&lgr->list)) {
1061                 smc_lgr_unregister_conn(conn);
1062                 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1063         }
1064
1065         if (!lgr->conns_num)
1066                 smc_lgr_schedule_free_work(lgr);
1067 }
1068
1069 /* unregister a link from a buf_desc */
1070 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1071                                 struct smc_link *lnk)
1072 {
1073         if (is_rmb)
1074                 buf_desc->is_reg_mr[lnk->link_idx] = false;
1075         if (!buf_desc->is_map_ib[lnk->link_idx])
1076                 return;
1077         if (is_rmb) {
1078                 if (buf_desc->mr_rx[lnk->link_idx]) {
1079                         smc_ib_put_memory_region(
1080                                         buf_desc->mr_rx[lnk->link_idx]);
1081                         buf_desc->mr_rx[lnk->link_idx] = NULL;
1082                 }
1083                 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1084         } else {
1085                 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1086         }
1087         sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1088         buf_desc->is_map_ib[lnk->link_idx] = false;
1089 }
1090
1091 /* unmap all buffers of lgr for a deleted link */
1092 static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1093 {
1094         struct smc_link_group *lgr = lnk->lgr;
1095         struct smc_buf_desc *buf_desc, *bf;
1096         int i;
1097
1098         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1099                 mutex_lock(&lgr->rmbs_lock);
1100                 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1101                         smcr_buf_unmap_link(buf_desc, true, lnk);
1102                 mutex_unlock(&lgr->rmbs_lock);
1103                 mutex_lock(&lgr->sndbufs_lock);
1104                 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1105                                          list)
1106                         smcr_buf_unmap_link(buf_desc, false, lnk);
1107                 mutex_unlock(&lgr->sndbufs_lock);
1108         }
1109 }
1110
1111 static void smcr_rtoken_clear_link(struct smc_link *lnk)
1112 {
1113         struct smc_link_group *lgr = lnk->lgr;
1114         int i;
1115
1116         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1117                 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1118                 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1119         }
1120 }
1121
1122 /* must be called under lgr->llc_conf_mutex lock */
1123 void smcr_link_clear(struct smc_link *lnk, bool log)
1124 {
1125         struct smc_ib_device *smcibdev;
1126
1127         if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
1128                 return;
1129         lnk->peer_qpn = 0;
1130         smc_llc_link_clear(lnk, log);
1131         smcr_buf_unmap_lgr(lnk);
1132         smcr_rtoken_clear_link(lnk);
1133         smc_ib_modify_qp_reset(lnk);
1134         smc_wr_free_link(lnk);
1135         smc_ib_destroy_queue_pair(lnk);
1136         smc_ib_dealloc_protection_domain(lnk);
1137         smc_wr_free_link_mem(lnk);
1138         smc_ibdev_cnt_dec(lnk);
1139         put_device(&lnk->smcibdev->ibdev->dev);
1140         smcibdev = lnk->smcibdev;
1141         memset(lnk, 0, sizeof(struct smc_link));
1142         lnk->state = SMC_LNK_UNUSED;
1143         if (!atomic_dec_return(&smcibdev->lnk_cnt))
1144                 wake_up(&smcibdev->lnks_deleted);
1145 }
1146
1147 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1148                           struct smc_buf_desc *buf_desc)
1149 {
1150         int i;
1151
1152         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1153                 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1154
1155         if (buf_desc->pages)
1156                 __free_pages(buf_desc->pages, buf_desc->order);
1157         kfree(buf_desc);
1158 }
1159
1160 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1161                           struct smc_buf_desc *buf_desc)
1162 {
1163         if (is_dmb) {
1164                 /* restore original buf len */
1165                 buf_desc->len += sizeof(struct smcd_cdc_msg);
1166                 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1167         } else {
1168                 kfree(buf_desc->cpu_addr);
1169         }
1170         kfree(buf_desc);
1171 }
1172
1173 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1174                          struct smc_buf_desc *buf_desc)
1175 {
1176         if (lgr->is_smcd)
1177                 smcd_buf_free(lgr, is_rmb, buf_desc);
1178         else
1179                 smcr_buf_free(lgr, is_rmb, buf_desc);
1180 }
1181
1182 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1183 {
1184         struct smc_buf_desc *buf_desc, *bf_desc;
1185         struct list_head *buf_list;
1186         int i;
1187
1188         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1189                 if (is_rmb)
1190                         buf_list = &lgr->rmbs[i];
1191                 else
1192                         buf_list = &lgr->sndbufs[i];
1193                 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1194                                          list) {
1195                         list_del(&buf_desc->list);
1196                         smc_buf_free(lgr, is_rmb, buf_desc);
1197                 }
1198         }
1199 }
1200
1201 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1202 {
1203         /* free send buffers */
1204         __smc_lgr_free_bufs(lgr, false);
1205         /* free rmbs */
1206         __smc_lgr_free_bufs(lgr, true);
1207 }
1208
1209 /* remove a link group */
1210 static void smc_lgr_free(struct smc_link_group *lgr)
1211 {
1212         int i;
1213
1214         if (!lgr->is_smcd) {
1215                 mutex_lock(&lgr->llc_conf_mutex);
1216                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1217                         if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1218                                 smcr_link_clear(&lgr->lnk[i], false);
1219                 }
1220                 mutex_unlock(&lgr->llc_conf_mutex);
1221                 smc_llc_lgr_clear(lgr);
1222         }
1223
1224         smc_lgr_free_bufs(lgr);
1225         destroy_workqueue(lgr->tx_wq);
1226         if (lgr->is_smcd) {
1227                 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1228                 put_device(&lgr->smcd->dev);
1229                 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1230                         wake_up(&lgr->smcd->lgrs_deleted);
1231         } else {
1232                 if (!atomic_dec_return(&lgr_cnt))
1233                         wake_up(&lgrs_deleted);
1234         }
1235         kfree(lgr);
1236 }
1237
1238 static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
1239 {
1240         int i;
1241
1242         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1243                 struct smc_buf_desc *buf_desc;
1244
1245                 list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
1246                         buf_desc->len += sizeof(struct smcd_cdc_msg);
1247                         smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1248                 }
1249         }
1250 }
1251
1252 static void smc_sk_wake_ups(struct smc_sock *smc)
1253 {
1254         smc->sk.sk_write_space(&smc->sk);
1255         smc->sk.sk_data_ready(&smc->sk);
1256         smc->sk.sk_state_change(&smc->sk);
1257 }
1258
1259 /* kill a connection */
1260 static void smc_conn_kill(struct smc_connection *conn, bool soft)
1261 {
1262         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1263
1264         if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1265                 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1266         else
1267                 smc_close_abort(conn);
1268         conn->killed = 1;
1269         smc->sk.sk_err = ECONNABORTED;
1270         smc_sk_wake_ups(smc);
1271         if (conn->lgr->is_smcd) {
1272                 smc_ism_unset_conn(conn);
1273                 if (soft)
1274                         tasklet_kill(&conn->rx_tsklet);
1275                 else
1276                         tasklet_unlock_wait(&conn->rx_tsklet);
1277         } else {
1278                 smc_cdc_tx_dismiss_slots(conn);
1279         }
1280         smc_lgr_unregister_conn(conn);
1281         smc_close_active_abort(smc);
1282 }
1283
1284 static void smc_lgr_cleanup(struct smc_link_group *lgr)
1285 {
1286         if (lgr->is_smcd) {
1287                 smc_ism_signal_shutdown(lgr);
1288                 smcd_unregister_all_dmbs(lgr);
1289         } else {
1290                 u32 rsn = lgr->llc_termination_rsn;
1291
1292                 if (!rsn)
1293                         rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1294                 smc_llc_send_link_delete_all(lgr, false, rsn);
1295                 smcr_lgr_link_deactivate_all(lgr);
1296         }
1297 }
1298
1299 /* terminate link group
1300  * @soft: true if link group shutdown can take its time
1301  *        false if immediate link group shutdown is required
1302  */
1303 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1304 {
1305         struct smc_connection *conn;
1306         struct smc_sock *smc;
1307         struct rb_node *node;
1308
1309         if (lgr->terminating)
1310                 return; /* lgr already terminating */
1311         /* cancel free_work sync, will terminate when lgr->freeing is set */
1312         cancel_delayed_work_sync(&lgr->free_work);
1313         lgr->terminating = 1;
1314
1315         /* kill remaining link group connections */
1316         read_lock_bh(&lgr->conns_lock);
1317         node = rb_first(&lgr->conns_all);
1318         while (node) {
1319                 read_unlock_bh(&lgr->conns_lock);
1320                 conn = rb_entry(node, struct smc_connection, alert_node);
1321                 smc = container_of(conn, struct smc_sock, conn);
1322                 sock_hold(&smc->sk); /* sock_put below */
1323                 lock_sock(&smc->sk);
1324                 smc_conn_kill(conn, soft);
1325                 release_sock(&smc->sk);
1326                 sock_put(&smc->sk); /* sock_hold above */
1327                 read_lock_bh(&lgr->conns_lock);
1328                 node = rb_first(&lgr->conns_all);
1329         }
1330         read_unlock_bh(&lgr->conns_lock);
1331         smc_lgr_cleanup(lgr);
1332         smc_lgr_free(lgr);
1333 }
1334
1335 /* unlink link group and schedule termination */
1336 void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1337 {
1338         spinlock_t *lgr_lock;
1339
1340         smc_lgr_list_head(lgr, &lgr_lock);
1341         spin_lock_bh(lgr_lock);
1342         if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1343                 spin_unlock_bh(lgr_lock);
1344                 return; /* lgr already terminating */
1345         }
1346         list_del_init(&lgr->list);
1347         lgr->freeing = 1;
1348         spin_unlock_bh(lgr_lock);
1349         schedule_work(&lgr->terminate_work);
1350 }
1351
1352 /* Called when peer lgr shutdown (regularly or abnormally) is received */
1353 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1354 {
1355         struct smc_link_group *lgr, *l;
1356         LIST_HEAD(lgr_free_list);
1357
1358         /* run common cleanup function and build free list */
1359         spin_lock_bh(&dev->lgr_lock);
1360         list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1361                 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1362                     (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1363                         if (peer_gid) /* peer triggered termination */
1364                                 lgr->peer_shutdown = 1;
1365                         list_move(&lgr->list, &lgr_free_list);
1366                         lgr->freeing = 1;
1367                 }
1368         }
1369         spin_unlock_bh(&dev->lgr_lock);
1370
1371         /* cancel the regular free workers and actually free lgrs */
1372         list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1373                 list_del_init(&lgr->list);
1374                 schedule_work(&lgr->terminate_work);
1375         }
1376 }
1377
1378 /* Called when an SMCD device is removed or the smc module is unloaded */
1379 void smc_smcd_terminate_all(struct smcd_dev *smcd)
1380 {
1381         struct smc_link_group *lgr, *lg;
1382         LIST_HEAD(lgr_free_list);
1383
1384         spin_lock_bh(&smcd->lgr_lock);
1385         list_splice_init(&smcd->lgr_list, &lgr_free_list);
1386         list_for_each_entry(lgr, &lgr_free_list, list)
1387                 lgr->freeing = 1;
1388         spin_unlock_bh(&smcd->lgr_lock);
1389
1390         list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1391                 list_del_init(&lgr->list);
1392                 __smc_lgr_terminate(lgr, false);
1393         }
1394
1395         if (atomic_read(&smcd->lgr_cnt))
1396                 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1397 }
1398
1399 /* Called when an SMCR device is removed or the smc module is unloaded.
1400  * If smcibdev is given, all SMCR link groups using this device are terminated.
1401  * If smcibdev is NULL, all SMCR link groups are terminated.
1402  */
1403 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1404 {
1405         struct smc_link_group *lgr, *lg;
1406         LIST_HEAD(lgr_free_list);
1407         int i;
1408
1409         spin_lock_bh(&smc_lgr_list.lock);
1410         if (!smcibdev) {
1411                 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1412                 list_for_each_entry(lgr, &lgr_free_list, list)
1413                         lgr->freeing = 1;
1414         } else {
1415                 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1416                         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1417                                 if (lgr->lnk[i].smcibdev == smcibdev)
1418                                         smcr_link_down_cond_sched(&lgr->lnk[i]);
1419                         }
1420                 }
1421         }
1422         spin_unlock_bh(&smc_lgr_list.lock);
1423
1424         list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1425                 list_del_init(&lgr->list);
1426                 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1427                 __smc_lgr_terminate(lgr, false);
1428         }
1429
1430         if (smcibdev) {
1431                 if (atomic_read(&smcibdev->lnk_cnt))
1432                         wait_event(smcibdev->lnks_deleted,
1433                                    !atomic_read(&smcibdev->lnk_cnt));
1434         } else {
1435                 if (atomic_read(&lgr_cnt))
1436                         wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1437         }
1438 }
1439
1440 /* set new lgr type and clear all asymmetric link tagging */
1441 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1442 {
1443         char *lgr_type = "";
1444         int i;
1445
1446         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1447                 if (smc_link_usable(&lgr->lnk[i]))
1448                         lgr->lnk[i].link_is_asym = false;
1449         if (lgr->type == new_type)
1450                 return;
1451         lgr->type = new_type;
1452
1453         switch (lgr->type) {
1454         case SMC_LGR_NONE:
1455                 lgr_type = "NONE";
1456                 break;
1457         case SMC_LGR_SINGLE:
1458                 lgr_type = "SINGLE";
1459                 break;
1460         case SMC_LGR_SYMMETRIC:
1461                 lgr_type = "SYMMETRIC";
1462                 break;
1463         case SMC_LGR_ASYMMETRIC_PEER:
1464                 lgr_type = "ASYMMETRIC_PEER";
1465                 break;
1466         case SMC_LGR_ASYMMETRIC_LOCAL:
1467                 lgr_type = "ASYMMETRIC_LOCAL";
1468                 break;
1469         }
1470         pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1471                             "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1472                             lgr_type, lgr->pnet_id);
1473 }
1474
1475 /* set new lgr type and tag a link as asymmetric */
1476 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1477                             enum smc_lgr_type new_type, int asym_lnk_idx)
1478 {
1479         smcr_lgr_set_type(lgr, new_type);
1480         lgr->lnk[asym_lnk_idx].link_is_asym = true;
1481 }
1482
1483 /* abort connection, abort_work scheduled from tasklet context */
1484 static void smc_conn_abort_work(struct work_struct *work)
1485 {
1486         struct smc_connection *conn = container_of(work,
1487                                                    struct smc_connection,
1488                                                    abort_work);
1489         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1490
1491         smc_conn_kill(conn, true);
1492         sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1493 }
1494
1495 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1496 {
1497         struct smc_link_group *lgr, *n;
1498
1499         list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1500                 struct smc_link *link;
1501
1502                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1503                             SMC_MAX_PNETID_LEN) ||
1504                     lgr->type == SMC_LGR_SYMMETRIC ||
1505                     lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1506                         continue;
1507
1508                 /* trigger local add link processing */
1509                 link = smc_llc_usable_link(lgr);
1510                 if (link)
1511                         smc_llc_add_link_local(link);
1512         }
1513 }
1514
1515 /* link is down - switch connections to alternate link,
1516  * must be called under lgr->llc_conf_mutex lock
1517  */
1518 static void smcr_link_down(struct smc_link *lnk)
1519 {
1520         struct smc_link_group *lgr = lnk->lgr;
1521         struct smc_link *to_lnk;
1522         int del_link_id;
1523
1524         if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1525                 return;
1526
1527         smc_ib_modify_qp_reset(lnk);
1528         to_lnk = smc_switch_conns(lgr, lnk, true);
1529         if (!to_lnk) { /* no backup link available */
1530                 smcr_link_clear(lnk, true);
1531                 return;
1532         }
1533         smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1534         del_link_id = lnk->link_id;
1535
1536         if (lgr->role == SMC_SERV) {
1537                 /* trigger local delete link processing */
1538                 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1539         } else {
1540                 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1541                         /* another llc task is ongoing */
1542                         mutex_unlock(&lgr->llc_conf_mutex);
1543                         wait_event_timeout(lgr->llc_flow_waiter,
1544                                 (list_empty(&lgr->list) ||
1545                                  lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1546                                 SMC_LLC_WAIT_TIME);
1547                         mutex_lock(&lgr->llc_conf_mutex);
1548                 }
1549                 if (!list_empty(&lgr->list)) {
1550                         smc_llc_send_delete_link(to_lnk, del_link_id,
1551                                                  SMC_LLC_REQ, true,
1552                                                  SMC_LLC_DEL_LOST_PATH);
1553                         smcr_link_clear(lnk, true);
1554                 }
1555                 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1556         }
1557 }
1558
1559 /* must be called under lgr->llc_conf_mutex lock */
1560 void smcr_link_down_cond(struct smc_link *lnk)
1561 {
1562         if (smc_link_downing(&lnk->state))
1563                 smcr_link_down(lnk);
1564 }
1565
1566 /* will get the lgr->llc_conf_mutex lock */
1567 void smcr_link_down_cond_sched(struct smc_link *lnk)
1568 {
1569         if (smc_link_downing(&lnk->state))
1570                 schedule_work(&lnk->link_down_wrk);
1571 }
1572
1573 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1574 {
1575         struct smc_link_group *lgr, *n;
1576         int i;
1577
1578         list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1579                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1580                             SMC_MAX_PNETID_LEN))
1581                         continue; /* lgr is not affected */
1582                 if (list_empty(&lgr->list))
1583                         continue;
1584                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1585                         struct smc_link *lnk = &lgr->lnk[i];
1586
1587                         if (smc_link_usable(lnk) &&
1588                             lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1589                                 smcr_link_down_cond_sched(lnk);
1590                 }
1591         }
1592 }
1593
1594 static void smc_link_down_work(struct work_struct *work)
1595 {
1596         struct smc_link *link = container_of(work, struct smc_link,
1597                                              link_down_wrk);
1598         struct smc_link_group *lgr = link->lgr;
1599
1600         if (list_empty(&lgr->list))
1601                 return;
1602         wake_up_all(&lgr->llc_msg_waiter);
1603         mutex_lock(&lgr->llc_conf_mutex);
1604         smcr_link_down(link);
1605         mutex_unlock(&lgr->llc_conf_mutex);
1606 }
1607
1608 /* Determine vlan of internal TCP socket.
1609  * @vlan_id: address to store the determined vlan id into
1610  */
1611 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1612 {
1613         struct dst_entry *dst = sk_dst_get(clcsock->sk);
1614         struct net_device *ndev;
1615         int i, nest_lvl, rc = 0;
1616
1617         ini->vlan_id = 0;
1618         if (!dst) {
1619                 rc = -ENOTCONN;
1620                 goto out;
1621         }
1622         if (!dst->dev) {
1623                 rc = -ENODEV;
1624                 goto out_rel;
1625         }
1626
1627         ndev = dst->dev;
1628         if (is_vlan_dev(ndev)) {
1629                 ini->vlan_id = vlan_dev_vlan_id(ndev);
1630                 goto out_rel;
1631         }
1632
1633         rtnl_lock();
1634         nest_lvl = ndev->lower_level;
1635         for (i = 0; i < nest_lvl; i++) {
1636                 struct list_head *lower = &ndev->adj_list.lower;
1637
1638                 if (list_empty(lower))
1639                         break;
1640                 lower = lower->next;
1641                 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
1642                 if (is_vlan_dev(ndev)) {
1643                         ini->vlan_id = vlan_dev_vlan_id(ndev);
1644                         break;
1645                 }
1646         }
1647         rtnl_unlock();
1648
1649 out_rel:
1650         dst_release(dst);
1651 out:
1652         return rc;
1653 }
1654
1655 static bool smcr_lgr_match(struct smc_link_group *lgr,
1656                            struct smc_clc_msg_local *lcl,
1657                            enum smc_lgr_role role, u32 clcqpn)
1658 {
1659         int i;
1660
1661         if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1662             lgr->role != role)
1663                 return false;
1664
1665         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1666                 if (!smc_link_active(&lgr->lnk[i]))
1667                         continue;
1668                 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1669                     !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1670                     !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1671                         return true;
1672         }
1673         return false;
1674 }
1675
1676 static bool smcd_lgr_match(struct smc_link_group *lgr,
1677                            struct smcd_dev *smcismdev, u64 peer_gid)
1678 {
1679         return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1680 }
1681
1682 /* create a new SMC connection (and a new link group if necessary) */
1683 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1684 {
1685         struct smc_connection *conn = &smc->conn;
1686         struct list_head *lgr_list;
1687         struct smc_link_group *lgr;
1688         enum smc_lgr_role role;
1689         spinlock_t *lgr_lock;
1690         int rc = 0;
1691
1692         lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1693                                   &smc_lgr_list.list;
1694         lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1695                                   &smc_lgr_list.lock;
1696         ini->first_contact_local = 1;
1697         role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1698         if (role == SMC_CLNT && ini->first_contact_peer)
1699                 /* create new link group as well */
1700                 goto create;
1701
1702         /* determine if an existing link group can be reused */
1703         spin_lock_bh(lgr_lock);
1704         list_for_each_entry(lgr, lgr_list, list) {
1705                 write_lock_bh(&lgr->conns_lock);
1706                 if ((ini->is_smcd ?
1707                      smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1708                                     ini->ism_peer_gid[ini->ism_selected]) :
1709                      smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
1710                     !lgr->sync_err &&
1711                     (ini->smcd_version == SMC_V2 ||
1712                      lgr->vlan_id == ini->vlan_id) &&
1713                     (role == SMC_CLNT || ini->is_smcd ||
1714                      lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
1715                         /* link group found */
1716                         ini->first_contact_local = 0;
1717                         conn->lgr = lgr;
1718                         rc = smc_lgr_register_conn(conn, false);
1719                         write_unlock_bh(&lgr->conns_lock);
1720                         if (!rc && delayed_work_pending(&lgr->free_work))
1721                                 cancel_delayed_work(&lgr->free_work);
1722                         break;
1723                 }
1724                 write_unlock_bh(&lgr->conns_lock);
1725         }
1726         spin_unlock_bh(lgr_lock);
1727         if (rc)
1728                 return rc;
1729
1730         if (role == SMC_CLNT && !ini->first_contact_peer &&
1731             ini->first_contact_local) {
1732                 /* Server reuses a link group, but Client wants to start
1733                  * a new one
1734                  * send out_of_sync decline, reason synchr. error
1735                  */
1736                 return SMC_CLC_DECL_SYNCERR;
1737         }
1738
1739 create:
1740         if (ini->first_contact_local) {
1741                 rc = smc_lgr_create(smc, ini);
1742                 if (rc)
1743                         goto out;
1744                 lgr = conn->lgr;
1745                 write_lock_bh(&lgr->conns_lock);
1746                 rc = smc_lgr_register_conn(conn, true);
1747                 write_unlock_bh(&lgr->conns_lock);
1748                 if (rc)
1749                         goto out;
1750         }
1751         conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1752         conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1753         conn->urg_state = SMC_URG_READ;
1754         INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1755         if (ini->is_smcd) {
1756                 conn->rx_off = sizeof(struct smcd_cdc_msg);
1757                 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1758         } else {
1759                 conn->rx_off = 0;
1760         }
1761 #ifndef KERNEL_HAS_ATOMIC64
1762         spin_lock_init(&conn->acurs_lock);
1763 #endif
1764
1765 out:
1766         return rc;
1767 }
1768
1769 /* convert the RMB size into the compressed notation - minimum 16K.
1770  * In contrast to plain ilog2, this rounds towards the next power of 2,
1771  * so the socket application gets at least its desired sndbuf / rcvbuf size.
1772  */
1773 static u8 smc_compress_bufsize(int size)
1774 {
1775         u8 compressed;
1776
1777         if (size <= SMC_BUF_MIN_SIZE)
1778                 return 0;
1779
1780         size = (size - 1) >> 14;
1781         compressed = ilog2(size) + 1;
1782         if (compressed >= SMC_RMBE_SIZES)
1783                 compressed = SMC_RMBE_SIZES - 1;
1784         return compressed;
1785 }
1786
1787 /* convert the RMB size from compressed notation into integer */
1788 int smc_uncompress_bufsize(u8 compressed)
1789 {
1790         u32 size;
1791
1792         size = 0x00000001 << (((int)compressed) + 14);
1793         return (int)size;
1794 }
1795
1796 /* try to reuse a sndbuf or rmb description slot for a certain
1797  * buffer size; if not available, return NULL
1798  */
1799 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1800                                              struct mutex *lock,
1801                                              struct list_head *buf_list)
1802 {
1803         struct smc_buf_desc *buf_slot;
1804
1805         mutex_lock(lock);
1806         list_for_each_entry(buf_slot, buf_list, list) {
1807                 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1808                         mutex_unlock(lock);
1809                         return buf_slot;
1810                 }
1811         }
1812         mutex_unlock(lock);
1813         return NULL;
1814 }
1815
1816 /* one of the conditions for announcing a receiver's current window size is
1817  * that it "results in a minimum increase in the window size of 10% of the
1818  * receive buffer space" [RFC7609]
1819  */
1820 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1821 {
1822         return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1823 }
1824
1825 /* map an rmb buf to a link */
1826 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1827                              struct smc_link *lnk)
1828 {
1829         int rc;
1830
1831         if (buf_desc->is_map_ib[lnk->link_idx])
1832                 return 0;
1833
1834         rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1835         if (rc)
1836                 return rc;
1837         sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1838                    buf_desc->cpu_addr, buf_desc->len);
1839
1840         /* map sg table to DMA address */
1841         rc = smc_ib_buf_map_sg(lnk, buf_desc,
1842                                is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1843         /* SMC protocol depends on mapping to one DMA address only */
1844         if (rc != 1) {
1845                 rc = -EAGAIN;
1846                 goto free_table;
1847         }
1848
1849         /* create a new memory region for the RMB */
1850         if (is_rmb) {
1851                 rc = smc_ib_get_memory_region(lnk->roce_pd,
1852                                               IB_ACCESS_REMOTE_WRITE |
1853                                               IB_ACCESS_LOCAL_WRITE,
1854                                               buf_desc, lnk->link_idx);
1855                 if (rc)
1856                         goto buf_unmap;
1857                 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1858         }
1859         buf_desc->is_map_ib[lnk->link_idx] = true;
1860         return 0;
1861
1862 buf_unmap:
1863         smc_ib_buf_unmap_sg(lnk, buf_desc,
1864                             is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1865 free_table:
1866         sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1867         return rc;
1868 }
1869
1870 /* register a new rmb on IB device,
1871  * must be called under lgr->llc_conf_mutex lock
1872  */
1873 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1874 {
1875         if (list_empty(&link->lgr->list))
1876                 return -ENOLINK;
1877         if (!rmb_desc->is_reg_mr[link->link_idx]) {
1878                 /* register memory region for new rmb */
1879                 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1880                         rmb_desc->is_reg_err = true;
1881                         return -EFAULT;
1882                 }
1883                 rmb_desc->is_reg_mr[link->link_idx] = true;
1884         }
1885         return 0;
1886 }
1887
1888 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1889                              struct list_head *lst, bool is_rmb)
1890 {
1891         struct smc_buf_desc *buf_desc, *bf;
1892         int rc = 0;
1893
1894         mutex_lock(lock);
1895         list_for_each_entry_safe(buf_desc, bf, lst, list) {
1896                 if (!buf_desc->used)
1897                         continue;
1898                 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1899                 if (rc)
1900                         goto out;
1901         }
1902 out:
1903         mutex_unlock(lock);
1904         return rc;
1905 }
1906
1907 /* map all used buffers of lgr for a new link */
1908 int smcr_buf_map_lgr(struct smc_link *lnk)
1909 {
1910         struct smc_link_group *lgr = lnk->lgr;
1911         int i, rc = 0;
1912
1913         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1914                 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1915                                        &lgr->rmbs[i], true);
1916                 if (rc)
1917                         return rc;
1918                 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1919                                        &lgr->sndbufs[i], false);
1920                 if (rc)
1921                         return rc;
1922         }
1923         return 0;
1924 }
1925
1926 /* register all used buffers of lgr for a new link,
1927  * must be called under lgr->llc_conf_mutex lock
1928  */
1929 int smcr_buf_reg_lgr(struct smc_link *lnk)
1930 {
1931         struct smc_link_group *lgr = lnk->lgr;
1932         struct smc_buf_desc *buf_desc, *bf;
1933         int i, rc = 0;
1934
1935         mutex_lock(&lgr->rmbs_lock);
1936         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1937                 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1938                         if (!buf_desc->used)
1939                                 continue;
1940                         rc = smcr_link_reg_rmb(lnk, buf_desc);
1941                         if (rc)
1942                                 goto out;
1943                 }
1944         }
1945 out:
1946         mutex_unlock(&lgr->rmbs_lock);
1947         return rc;
1948 }
1949
1950 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1951                                                 bool is_rmb, int bufsize)
1952 {
1953         struct smc_buf_desc *buf_desc;
1954
1955         /* try to alloc a new buffer */
1956         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1957         if (!buf_desc)
1958                 return ERR_PTR(-ENOMEM);
1959
1960         buf_desc->order = get_order(bufsize);
1961         buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1962                                       __GFP_NOMEMALLOC | __GFP_COMP |
1963                                       __GFP_NORETRY | __GFP_ZERO,
1964                                       buf_desc->order);
1965         if (!buf_desc->pages) {
1966                 kfree(buf_desc);
1967                 return ERR_PTR(-EAGAIN);
1968         }
1969         buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
1970         buf_desc->len = bufsize;
1971         return buf_desc;
1972 }
1973
1974 /* map buf_desc on all usable links,
1975  * unused buffers stay mapped as long as the link is up
1976  */
1977 static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1978                                      struct smc_buf_desc *buf_desc, bool is_rmb)
1979 {
1980         int i, rc = 0;
1981
1982         /* protect against parallel link reconfiguration */
1983         mutex_lock(&lgr->llc_conf_mutex);
1984         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1985                 struct smc_link *lnk = &lgr->lnk[i];
1986
1987                 if (!smc_link_usable(lnk))
1988                         continue;
1989                 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
1990                         rc = -ENOMEM;
1991                         goto out;
1992                 }
1993         }
1994 out:
1995         mutex_unlock(&lgr->llc_conf_mutex);
1996         return rc;
1997 }
1998
1999 #define SMCD_DMBE_SIZES         6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
2000
2001 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
2002                                                 bool is_dmb, int bufsize)
2003 {
2004         struct smc_buf_desc *buf_desc;
2005         int rc;
2006
2007         if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
2008                 return ERR_PTR(-EAGAIN);
2009
2010         /* try to alloc a new DMB */
2011         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2012         if (!buf_desc)
2013                 return ERR_PTR(-ENOMEM);
2014         if (is_dmb) {
2015                 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2016                 if (rc) {
2017                         kfree(buf_desc);
2018                         if (rc == -ENOMEM)
2019                                 return ERR_PTR(-EAGAIN);
2020                         if (rc == -ENOSPC)
2021                                 return ERR_PTR(-ENOSPC);
2022                         return ERR_PTR(-EIO);
2023                 }
2024                 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2025                 /* CDC header stored in buf. So, pretend it was smaller */
2026                 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2027         } else {
2028                 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2029                                              __GFP_NOWARN | __GFP_NORETRY |
2030                                              __GFP_NOMEMALLOC);
2031                 if (!buf_desc->cpu_addr) {
2032                         kfree(buf_desc);
2033                         return ERR_PTR(-EAGAIN);
2034                 }
2035                 buf_desc->len = bufsize;
2036         }
2037         return buf_desc;
2038 }
2039
2040 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2041 {
2042         struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2043         struct smc_connection *conn = &smc->conn;
2044         struct smc_link_group *lgr = conn->lgr;
2045         struct list_head *buf_list;
2046         int bufsize, bufsize_short;
2047         struct mutex *lock;     /* lock buffer list */
2048         int sk_buf_size;
2049
2050         if (is_rmb)
2051                 /* use socket recv buffer size (w/o overhead) as start value */
2052                 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2053         else
2054                 /* use socket send buffer size (w/o overhead) as start value */
2055                 sk_buf_size = smc->sk.sk_sndbuf / 2;
2056
2057         for (bufsize_short = smc_compress_bufsize(sk_buf_size);
2058              bufsize_short >= 0; bufsize_short--) {
2059
2060                 if (is_rmb) {
2061                         lock = &lgr->rmbs_lock;
2062                         buf_list = &lgr->rmbs[bufsize_short];
2063                 } else {
2064                         lock = &lgr->sndbufs_lock;
2065                         buf_list = &lgr->sndbufs[bufsize_short];
2066                 }
2067                 bufsize = smc_uncompress_bufsize(bufsize_short);
2068                 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
2069                         continue;
2070
2071                 /* check for reusable slot in the link group */
2072                 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2073                 if (buf_desc) {
2074                         memset(buf_desc->cpu_addr, 0, bufsize);
2075                         break; /* found reusable slot */
2076                 }
2077
2078                 if (is_smcd)
2079                         buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2080                 else
2081                         buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2082
2083                 if (PTR_ERR(buf_desc) == -ENOMEM)
2084                         break;
2085                 if (IS_ERR(buf_desc))
2086                         continue;
2087
2088                 buf_desc->used = 1;
2089                 mutex_lock(lock);
2090                 list_add(&buf_desc->list, buf_list);
2091                 mutex_unlock(lock);
2092                 break; /* found */
2093         }
2094
2095         if (IS_ERR(buf_desc))
2096                 return PTR_ERR(buf_desc);
2097
2098         if (!is_smcd) {
2099                 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2100                         smcr_buf_unuse(buf_desc, lgr);
2101                         return -ENOMEM;
2102                 }
2103         }
2104
2105         if (is_rmb) {
2106                 conn->rmb_desc = buf_desc;
2107                 conn->rmbe_size_short = bufsize_short;
2108                 smc->sk.sk_rcvbuf = bufsize * 2;
2109                 atomic_set(&conn->bytes_to_rcv, 0);
2110                 conn->rmbe_update_limit =
2111                         smc_rmb_wnd_update_limit(buf_desc->len);
2112                 if (is_smcd)
2113                         smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2114         } else {
2115                 conn->sndbuf_desc = buf_desc;
2116                 smc->sk.sk_sndbuf = bufsize * 2;
2117                 atomic_set(&conn->sndbuf_space, bufsize);
2118         }
2119         return 0;
2120 }
2121
2122 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2123 {
2124         if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2125                 return;
2126         smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2127 }
2128
2129 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2130 {
2131         if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2132                 return;
2133         smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2134 }
2135
2136 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2137 {
2138         int i;
2139
2140         if (!conn->lgr || conn->lgr->is_smcd)
2141                 return;
2142         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2143                 if (!smc_link_active(&conn->lgr->lnk[i]))
2144                         continue;
2145                 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2146                                        DMA_FROM_DEVICE);
2147         }
2148 }
2149
2150 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2151 {
2152         int i;
2153
2154         if (!conn->lgr || conn->lgr->is_smcd)
2155                 return;
2156         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2157                 if (!smc_link_active(&conn->lgr->lnk[i]))
2158                         continue;
2159                 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2160                                           DMA_FROM_DEVICE);
2161         }
2162 }
2163
2164 /* create the send and receive buffer for an SMC socket;
2165  * receive buffers are called RMBs;
2166  * (even though the SMC protocol allows more than one RMB-element per RMB,
2167  * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2168  * extra RMB for every connection in a link group
2169  */
2170 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2171 {
2172         int rc;
2173
2174         /* create send buffer */
2175         rc = __smc_buf_create(smc, is_smcd, false);
2176         if (rc)
2177                 return rc;
2178         /* create rmb */
2179         rc = __smc_buf_create(smc, is_smcd, true);
2180         if (rc) {
2181                 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2182                 list_del(&smc->conn.sndbuf_desc->list);
2183                 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2184                 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2185                 smc->conn.sndbuf_desc = NULL;
2186         }
2187         return rc;
2188 }
2189
2190 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2191 {
2192         int i;
2193
2194         for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2195                 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2196                         return i;
2197         }
2198         return -ENOSPC;
2199 }
2200
2201 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2202                                    u32 rkey)
2203 {
2204         int i;
2205
2206         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2207                 if (test_bit(i, lgr->rtokens_used_mask) &&
2208                     lgr->rtokens[i][lnk_idx].rkey == rkey)
2209                         return i;
2210         }
2211         return -ENOENT;
2212 }
2213
2214 /* set rtoken for a new link to an existing rmb */
2215 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2216                     __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2217 {
2218         int rtok_idx;
2219
2220         rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2221         if (rtok_idx == -ENOENT)
2222                 return;
2223         lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2224         lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2225 }
2226
2227 /* set rtoken for a new link whose link_id is given */
2228 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2229                      __be64 nw_vaddr, __be32 nw_rkey)
2230 {
2231         u64 dma_addr = be64_to_cpu(nw_vaddr);
2232         u32 rkey = ntohl(nw_rkey);
2233         bool found = false;
2234         int link_idx;
2235
2236         for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2237                 if (lgr->lnk[link_idx].link_id == link_id) {
2238                         found = true;
2239                         break;
2240                 }
2241         }
2242         if (!found)
2243                 return;
2244         lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2245         lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2246 }
2247
2248 /* add a new rtoken from peer */
2249 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2250 {
2251         struct smc_link_group *lgr = smc_get_lgr(lnk);
2252         u64 dma_addr = be64_to_cpu(nw_vaddr);
2253         u32 rkey = ntohl(nw_rkey);
2254         int i;
2255
2256         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2257                 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2258                     lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2259                     test_bit(i, lgr->rtokens_used_mask)) {
2260                         /* already in list */
2261                         return i;
2262                 }
2263         }
2264         i = smc_rmb_reserve_rtoken_idx(lgr);
2265         if (i < 0)
2266                 return i;
2267         lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2268         lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2269         return i;
2270 }
2271
2272 /* delete an rtoken from all links */
2273 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2274 {
2275         struct smc_link_group *lgr = smc_get_lgr(lnk);
2276         u32 rkey = ntohl(nw_rkey);
2277         int i, j;
2278
2279         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2280                 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2281                     test_bit(i, lgr->rtokens_used_mask)) {
2282                         for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2283                                 lgr->rtokens[i][j].rkey = 0;
2284                                 lgr->rtokens[i][j].dma_addr = 0;
2285                         }
2286                         clear_bit(i, lgr->rtokens_used_mask);
2287                         return 0;
2288                 }
2289         }
2290         return -ENOENT;
2291 }
2292
2293 /* save rkey and dma_addr received from peer during clc handshake */
2294 int smc_rmb_rtoken_handling(struct smc_connection *conn,
2295                             struct smc_link *lnk,
2296                             struct smc_clc_msg_accept_confirm *clc)
2297 {
2298         conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2299                                           clc->r0.rmb_rkey);
2300         if (conn->rtoken_idx < 0)
2301                 return conn->rtoken_idx;
2302         return 0;
2303 }
2304
2305 static void smc_core_going_away(void)
2306 {
2307         struct smc_ib_device *smcibdev;
2308         struct smcd_dev *smcd;
2309
2310         mutex_lock(&smc_ib_devices.mutex);
2311         list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2312                 int i;
2313
2314                 for (i = 0; i < SMC_MAX_PORTS; i++)
2315                         set_bit(i, smcibdev->ports_going_away);
2316         }
2317         mutex_unlock(&smc_ib_devices.mutex);
2318
2319         mutex_lock(&smcd_dev_list.mutex);
2320         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2321                 smcd->going_away = 1;
2322         }
2323         mutex_unlock(&smcd_dev_list.mutex);
2324 }
2325
2326 /* Clean up all SMC link groups */
2327 static void smc_lgrs_shutdown(void)
2328 {
2329         struct smcd_dev *smcd;
2330
2331         smc_core_going_away();
2332
2333         smc_smcr_terminate_all(NULL);
2334
2335         mutex_lock(&smcd_dev_list.mutex);
2336         list_for_each_entry(smcd, &smcd_dev_list.list, list)
2337                 smc_smcd_terminate_all(smcd);
2338         mutex_unlock(&smcd_dev_list.mutex);
2339 }
2340
2341 static int smc_core_reboot_event(struct notifier_block *this,
2342                                  unsigned long event, void *ptr)
2343 {
2344         smc_lgrs_shutdown();
2345         smc_ib_unregister_client();
2346         return 0;
2347 }
2348
2349 static struct notifier_block smc_reboot_notifier = {
2350         .notifier_call = smc_core_reboot_event,
2351 };
2352
2353 int __init smc_core_init(void)
2354 {
2355         return register_reboot_notifier(&smc_reboot_notifier);
2356 }
2357
2358 /* Called (from smc_exit) when module is removed */
2359 void smc_core_exit(void)
2360 {
2361         unregister_reboot_notifier(&smc_reboot_notifier);
2362         smc_lgrs_shutdown();
2363 }