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