net/smc/smc_llc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  Link Layer Control (LLC)
   6  *
   7  *  Copyright IBM Corp. 2016
   8  *
   9  *  Author(s):  Klaus Wacker <Klaus.Wacker@de.ibm.com>
  10  *              Ursula Braun <ubraun@linux.vnet.ibm.com>
  11  */
  12
  13 #include <net/tcp.h>
  14 #include <rdma/ib_verbs.h>
  15
  16 #include "smc.h"
  17 #include "smc_core.h"
  18 #include "smc_clc.h"
  19 #include "smc_llc.h"
  20 #include "smc_pnet.h"
  21
  22 #define SMC_LLC_DATA_LEN                40
  23
  24 struct smc_llc_hdr {
  25         struct smc_wr_rx_hdr common;
  26         union {
  27                 struct {
  28                         u8 length;      /* 44 */
  29         #if defined(__BIG_ENDIAN_BITFIELD)
  30                         u8 reserved:4,
  31                            add_link_rej_rsn:4;
  32 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  33                         u8 add_link_rej_rsn:4,
  34                            reserved:4;
  35 #endif
  36                 };
  37                 u16 length_v2;  /* 44 - 8192*/
  38         };
  39         u8 flags;
  40 } __packed;             /* format defined in
  41                          * IBM Shared Memory Communications Version 2
  42                          * (https://www.ibm.com/support/pages/node/6326337)
  43                          */
  44
  45 #define SMC_LLC_FLAG_NO_RMBE_EYEC       0x03
  46
  47 struct smc_llc_msg_confirm_link {       /* type 0x01 */
  48         struct smc_llc_hdr hd;
  49         u8 sender_mac[ETH_ALEN];
  50         u8 sender_gid[SMC_GID_SIZE];
  51         u8 sender_qp_num[3];
  52         u8 link_num;
  53         u8 link_uid[SMC_LGR_ID_SIZE];
  54         u8 max_links;
  55         u8 reserved[9];
  56 };
  57
  58 #define SMC_LLC_FLAG_ADD_LNK_REJ        0x40
  59 #define SMC_LLC_REJ_RSN_NO_ALT_PATH     1
  60
  61 #define SMC_LLC_ADD_LNK_MAX_LINKS       2
  62
  63 struct smc_llc_msg_add_link {           /* type 0x02 */
  64         struct smc_llc_hdr hd;
  65         u8 sender_mac[ETH_ALEN];
  66         u8 reserved2[2];
  67         u8 sender_gid[SMC_GID_SIZE];
  68         u8 sender_qp_num[3];
  69         u8 link_num;
  70 #if defined(__BIG_ENDIAN_BITFIELD)
  71         u8 reserved3 : 4,
  72            qp_mtu   : 4;
  73 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  74         u8 qp_mtu   : 4,
  75            reserved3 : 4;
  76 #endif
  77         u8 initial_psn[3];
  78         u8 reserved[8];
  79 };
  80
  81 struct smc_llc_msg_add_link_cont_rt {
  82         __be32 rmb_key;
  83         __be32 rmb_key_new;
  84         __be64 rmb_vaddr_new;
  85 };
  86
  87 struct smc_llc_msg_add_link_v2_ext {
  88 #if defined(__BIG_ENDIAN_BITFIELD)
  89         u8 v2_direct : 1,
  90            reserved  : 7;
  91 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  92         u8 reserved  : 7,
  93            v2_direct : 1;
  94 #endif
  95         u8 reserved2;
  96         u8 client_target_gid[SMC_GID_SIZE];
  97         u8 reserved3[8];
  98         u16 num_rkeys;
  99         struct smc_llc_msg_add_link_cont_rt rt[];
 100 } __packed;             /* format defined in
 101                          * IBM Shared Memory Communications Version 2
 102                          * (https://www.ibm.com/support/pages/node/6326337)
 103                          */
 104
 105 struct smc_llc_msg_req_add_link_v2 {
 106         struct smc_llc_hdr hd;
 107         u8 reserved[20];
 108         u8 gid_cnt;
 109         u8 reserved2[3];
 110         u8 gid[][SMC_GID_SIZE];
 111 };
 112
 113 #define SMC_LLC_RKEYS_PER_CONT_MSG      2
 114
 115 struct smc_llc_msg_add_link_cont {      /* type 0x03 */
 116         struct smc_llc_hdr hd;
 117         u8 link_num;
 118         u8 num_rkeys;
 119         u8 reserved2[2];
 120         struct smc_llc_msg_add_link_cont_rt rt[SMC_LLC_RKEYS_PER_CONT_MSG];
 121         u8 reserved[4];
 122 } __packed;                     /* format defined in RFC7609 */
 123
 124 #define SMC_LLC_FLAG_DEL_LINK_ALL       0x40
 125 #define SMC_LLC_FLAG_DEL_LINK_ORDERLY   0x20
 126
 127 struct smc_llc_msg_del_link {           /* type 0x04 */
 128         struct smc_llc_hdr hd;
 129         u8 link_num;
 130         __be32 reason;
 131         u8 reserved[35];
 132 } __packed;                     /* format defined in RFC7609 */
 133
 134 struct smc_llc_msg_test_link {          /* type 0x07 */
 135         struct smc_llc_hdr hd;
 136         u8 user_data[16];
 137         u8 reserved[24];
 138 };
 139
 140 struct smc_rmb_rtoken {
 141         union {
 142                 u8 num_rkeys;   /* first rtoken byte of CONFIRM LINK msg */
 143                                 /* is actually the num of rtokens, first */
 144                                 /* rtoken is always for the current link */
 145                 u8 link_id;     /* link id of the rtoken */
 146         };
 147         __be32 rmb_key;
 148         __be64 rmb_vaddr;
 149 } __packed;                     /* format defined in RFC7609 */
 150
 151 #define SMC_LLC_RKEYS_PER_MSG           3
 152 #define SMC_LLC_RKEYS_PER_MSG_V2        255
 153
 154 struct smc_llc_msg_confirm_rkey {       /* type 0x06 */
 155         struct smc_llc_hdr hd;
 156         struct smc_rmb_rtoken rtoken[SMC_LLC_RKEYS_PER_MSG];
 157         u8 reserved;
 158 };
 159
 160 #define SMC_LLC_DEL_RKEY_MAX    8
 161 #define SMC_LLC_FLAG_RKEY_RETRY 0x10
 162 #define SMC_LLC_FLAG_RKEY_NEG   0x20
 163
 164 struct smc_llc_msg_delete_rkey {        /* type 0x09 */
 165         struct smc_llc_hdr hd;
 166         u8 num_rkeys;
 167         u8 err_mask;
 168         u8 reserved[2];
 169         __be32 rkey[8];
 170         u8 reserved2[4];
 171 };
 172
 173 struct smc_llc_msg_delete_rkey_v2 {     /* type 0x29 */
 174         struct smc_llc_hdr hd;
 175         u8 num_rkeys;
 176         u8 num_inval_rkeys;
 177         u8 reserved[2];
 178         __be32 rkey[];
 179 };
 180
 181 union smc_llc_msg {
 182         struct smc_llc_msg_confirm_link confirm_link;
 183         struct smc_llc_msg_add_link add_link;
 184         struct smc_llc_msg_req_add_link_v2 req_add_link;
 185         struct smc_llc_msg_add_link_cont add_link_cont;
 186         struct smc_llc_msg_del_link delete_link;
 187
 188         struct smc_llc_msg_confirm_rkey confirm_rkey;
 189         struct smc_llc_msg_delete_rkey delete_rkey;
 190
 191         struct smc_llc_msg_test_link test_link;
 192         struct {
 193                 struct smc_llc_hdr hdr;
 194                 u8 data[SMC_LLC_DATA_LEN];
 195         } raw;
 196 };
 197
 198 #define SMC_LLC_FLAG_RESP               0x80
 199
 200 struct smc_llc_qentry {
 201         struct list_head list;
 202         struct smc_link *link;
 203         union smc_llc_msg msg;
 204 };
 205
 206 static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc);
 207
 208 struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow)
 209 {
 210         struct smc_llc_qentry *qentry = flow->qentry;
 211
 212         flow->qentry = NULL;
 213         return qentry;
 214 }
 215
 216 void smc_llc_flow_qentry_del(struct smc_llc_flow *flow)
 217 {
 218         struct smc_llc_qentry *qentry;
 219
 220         if (flow->qentry) {
 221                 qentry = flow->qentry;
 222                 flow->qentry = NULL;
 223                 kfree(qentry);
 224         }
 225 }
 226
 227 static inline void smc_llc_flow_qentry_set(struct smc_llc_flow *flow,
 228                                            struct smc_llc_qentry *qentry)
 229 {
 230         flow->qentry = qentry;
 231 }
 232
 233 static void smc_llc_flow_parallel(struct smc_link_group *lgr, u8 flow_type,
 234                                   struct smc_llc_qentry *qentry)
 235 {
 236         u8 msg_type = qentry->msg.raw.hdr.common.llc_type;
 237
 238         if ((msg_type == SMC_LLC_ADD_LINK || msg_type == SMC_LLC_DELETE_LINK) &&
 239             flow_type != msg_type && !lgr->delayed_event) {
 240                 lgr->delayed_event = qentry;
 241                 return;
 242         }
 243         /* drop parallel or already-in-progress llc requests */
 244         if (flow_type != msg_type)
 245                 pr_warn_once("smc: SMC-R lg %*phN net %llu dropped parallel "
 246                              "LLC msg: msg %d flow %d role %d\n",
 247                              SMC_LGR_ID_SIZE, &lgr->id,
 248                              lgr->net->net_cookie,
 249                              qentry->msg.raw.hdr.common.type,
 250                              flow_type, lgr->role);
 251         kfree(qentry);
 252 }
 253
 254 /* try to start a new llc flow, initiated by an incoming llc msg */
 255 static bool smc_llc_flow_start(struct smc_llc_flow *flow,
 256                                struct smc_llc_qentry *qentry)
 257 {
 258         struct smc_link_group *lgr = qentry->link->lgr;
 259
 260         spin_lock_bh(&lgr->llc_flow_lock);
 261         if (flow->type) {
 262                 /* a flow is already active */
 263                 smc_llc_flow_parallel(lgr, flow->type, qentry);
 264                 spin_unlock_bh(&lgr->llc_flow_lock);
 265                 return false;
 266         }
 267         switch (qentry->msg.raw.hdr.common.llc_type) {
 268         case SMC_LLC_ADD_LINK:
 269                 flow->type = SMC_LLC_FLOW_ADD_LINK;
 270                 break;
 271         case SMC_LLC_DELETE_LINK:
 272                 flow->type = SMC_LLC_FLOW_DEL_LINK;
 273                 break;
 274         case SMC_LLC_CONFIRM_RKEY:
 275         case SMC_LLC_DELETE_RKEY:
 276                 flow->type = SMC_LLC_FLOW_RKEY;
 277                 break;
 278         default:
 279                 flow->type = SMC_LLC_FLOW_NONE;
 280         }
 281         smc_llc_flow_qentry_set(flow, qentry);
 282         spin_unlock_bh(&lgr->llc_flow_lock);
 283         return true;
 284 }
 285
 286 /* start a new local llc flow, wait till current flow finished */
 287 int smc_llc_flow_initiate(struct smc_link_group *lgr,
 288                           enum smc_llc_flowtype type)
 289 {
 290         enum smc_llc_flowtype allowed_remote = SMC_LLC_FLOW_NONE;
 291         int rc;
 292
 293         /* all flows except confirm_rkey and delete_rkey are exclusive,
 294          * confirm/delete rkey flows can run concurrently (local and remote)
 295          */
 296         if (type == SMC_LLC_FLOW_RKEY)
 297                 allowed_remote = SMC_LLC_FLOW_RKEY;
 298 again:
 299         if (list_empty(&lgr->list))
 300                 return -ENODEV;
 301         spin_lock_bh(&lgr->llc_flow_lock);
 302         if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE &&
 303             (lgr->llc_flow_rmt.type == SMC_LLC_FLOW_NONE ||
 304              lgr->llc_flow_rmt.type == allowed_remote)) {
 305                 lgr->llc_flow_lcl.type = type;
 306                 spin_unlock_bh(&lgr->llc_flow_lock);
 307                 return 0;
 308         }
 309         spin_unlock_bh(&lgr->llc_flow_lock);
 310         rc = wait_event_timeout(lgr->llc_flow_waiter, (list_empty(&lgr->list) ||
 311                                 (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE &&
 312                                  (lgr->llc_flow_rmt.type == SMC_LLC_FLOW_NONE ||
 313                                   lgr->llc_flow_rmt.type == allowed_remote))),
 314                                 SMC_LLC_WAIT_TIME * 10);
 315         if (!rc)
 316                 return -ETIMEDOUT;
 317         goto again;
 318 }
 319
 320 /* finish the current llc flow */
 321 void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow)
 322 {
 323         spin_lock_bh(&lgr->llc_flow_lock);
 324         memset(flow, 0, sizeof(*flow));
 325         flow->type = SMC_LLC_FLOW_NONE;
 326         spin_unlock_bh(&lgr->llc_flow_lock);
 327         if (!list_empty(&lgr->list) && lgr->delayed_event &&
 328             flow == &lgr->llc_flow_lcl)
 329                 schedule_work(&lgr->llc_event_work);
 330         else
 331                 wake_up(&lgr->llc_flow_waiter);
 332 }
 333
 334 /* lnk is optional and used for early wakeup when link goes down, useful in
 335  * cases where we wait for a response on the link after we sent a request
 336  */
 337 struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
 338                                     struct smc_link *lnk,
 339                                     int time_out, u8 exp_msg)
 340 {
 341         struct smc_llc_flow *flow = &lgr->llc_flow_lcl;
 342         u8 rcv_msg;
 343
 344         wait_event_timeout(lgr->llc_msg_waiter,
 345                            (flow->qentry ||
 346                             (lnk && !smc_link_usable(lnk)) ||
 347                             list_empty(&lgr->list)),
 348                            time_out);
 349         if (!flow->qentry ||
 350             (lnk && !smc_link_usable(lnk)) || list_empty(&lgr->list)) {
 351                 smc_llc_flow_qentry_del(flow);
 352                 goto out;
 353         }
 354         rcv_msg = flow->qentry->msg.raw.hdr.common.llc_type;
 355         if (exp_msg && rcv_msg != exp_msg) {
 356                 if (exp_msg == SMC_LLC_ADD_LINK &&
 357                     rcv_msg == SMC_LLC_DELETE_LINK) {
 358                         /* flow_start will delay the unexpected msg */
 359                         smc_llc_flow_start(&lgr->llc_flow_lcl,
 360                                            smc_llc_flow_qentry_clr(flow));
 361                         return NULL;
 362                 }
 363                 pr_warn_once("smc: SMC-R lg %*phN net %llu dropped unexpected LLC msg: "
 364                              "msg %d exp %d flow %d role %d flags %x\n",
 365                              SMC_LGR_ID_SIZE, &lgr->id, lgr->net->net_cookie,
 366                              rcv_msg, exp_msg,
 367                              flow->type, lgr->role,
 368                              flow->qentry->msg.raw.hdr.flags);
 369                 smc_llc_flow_qentry_del(flow);
 370         }
 371 out:
 372         return flow->qentry;
 373 }
 374
 375 /********************************** send *************************************/
 376
 377 struct smc_llc_tx_pend {
 378 };
 379
 380 /* handler for send/transmission completion of an LLC msg */
 381 static void smc_llc_tx_handler(struct smc_wr_tx_pend_priv *pend,
 382                                struct smc_link *link,
 383                                enum ib_wc_status wc_status)
 384 {
 385         /* future work: handle wc_status error for recovery and failover */
 386 }
 387
 388 /**
 389  * smc_llc_add_pending_send() - add LLC control message to pending WQE transmits
 390  * @link: Pointer to SMC link used for sending LLC control message.
 391  * @wr_buf: Out variable returning pointer to work request payload buffer.
 392  * @pend: Out variable returning pointer to private pending WR tracking.
 393  *        It's the context the transmit complete handler will get.
 394  *
 395  * Reserves and pre-fills an entry for a pending work request send/tx.
 396  * Used by mid-level smc_llc_send_msg() to prepare for later actual send/tx.
 397  * Can sleep due to smc_get_ctrl_buf (if not in softirq context).
 398  *
 399  * Return: 0 on success, otherwise an error value.
 400  */
 401 static int smc_llc_add_pending_send(struct smc_link *link,
 402                                     struct smc_wr_buf **wr_buf,
 403                                     struct smc_wr_tx_pend_priv **pend)
 404 {
 405         int rc;
 406
 407         rc = smc_wr_tx_get_free_slot(link, smc_llc_tx_handler, wr_buf, NULL,
 408                                      pend);
 409         if (rc < 0)
 410                 return rc;
 411         BUILD_BUG_ON_MSG(
 412                 sizeof(union smc_llc_msg) > SMC_WR_BUF_SIZE,
 413                 "must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg)");
 414         BUILD_BUG_ON_MSG(
 415                 sizeof(union smc_llc_msg) != SMC_WR_TX_SIZE,
 416                 "must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send()");
 417         BUILD_BUG_ON_MSG(
 418                 sizeof(struct smc_llc_tx_pend) > SMC_WR_TX_PEND_PRIV_SIZE,
 419                 "must increase SMC_WR_TX_PEND_PRIV_SIZE to at least sizeof(struct smc_llc_tx_pend)");
 420         return 0;
 421 }
 422
 423 static int smc_llc_add_pending_send_v2(struct smc_link *link,
 424                                        struct smc_wr_v2_buf **wr_buf,
 425                                        struct smc_wr_tx_pend_priv **pend)
 426 {
 427         int rc;
 428
 429         rc = smc_wr_tx_get_v2_slot(link, smc_llc_tx_handler, wr_buf, pend);
 430         if (rc < 0)
 431                 return rc;
 432         return 0;
 433 }
 434
 435 static void smc_llc_init_msg_hdr(struct smc_llc_hdr *hdr,
 436                                  struct smc_link_group *lgr, size_t len)
 437 {
 438         if (lgr->smc_version == SMC_V2) {
 439                 hdr->common.llc_version = SMC_V2;
 440                 hdr->length_v2 = len;
 441         } else {
 442                 hdr->common.llc_version = 0;
 443                 hdr->length = len;
 444         }
 445 }
 446
 447 /* high-level API to send LLC confirm link */
 448 int smc_llc_send_confirm_link(struct smc_link *link,
 449                               enum smc_llc_reqresp reqresp)
 450 {
 451         struct smc_llc_msg_confirm_link *confllc;
 452         struct smc_wr_tx_pend_priv *pend;
 453         struct smc_wr_buf *wr_buf;
 454         int rc;
 455
 456         if (!smc_wr_tx_link_hold(link))
 457                 return -ENOLINK;
 458         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 459         if (rc)
 460                 goto put_out;
 461         confllc = (struct smc_llc_msg_confirm_link *)wr_buf;
 462         memset(confllc, 0, sizeof(*confllc));
 463         confllc->hd.common.llc_type = SMC_LLC_CONFIRM_LINK;
 464         smc_llc_init_msg_hdr(&confllc->hd, link->lgr, sizeof(*confllc));
 465         confllc->hd.flags |= SMC_LLC_FLAG_NO_RMBE_EYEC;
 466         if (reqresp == SMC_LLC_RESP)
 467                 confllc->hd.flags |= SMC_LLC_FLAG_RESP;
 468         memcpy(confllc->sender_mac, link->smcibdev->mac[link->ibport - 1],
 469                ETH_ALEN);
 470         memcpy(confllc->sender_gid, link->gid, SMC_GID_SIZE);
 471         hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
 472         confllc->link_num = link->link_id;
 473         memcpy(confllc->link_uid, link->link_uid, SMC_LGR_ID_SIZE);
 474         confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS;
 475         /* send llc message */
 476         rc = smc_wr_tx_send(link, pend);
 477 put_out:
 478         smc_wr_tx_link_put(link);
 479         return rc;
 480 }
 481
 482 /* send LLC confirm rkey request */
 483 static int smc_llc_send_confirm_rkey(struct smc_link *send_link,
 484                                      struct smc_buf_desc *rmb_desc)
 485 {
 486         struct smc_llc_msg_confirm_rkey *rkeyllc;
 487         struct smc_wr_tx_pend_priv *pend;
 488         struct smc_wr_buf *wr_buf;
 489         struct smc_link *link;
 490         int i, rc, rtok_ix;
 491
 492         if (!smc_wr_tx_link_hold(send_link))
 493                 return -ENOLINK;
 494         rc = smc_llc_add_pending_send(send_link, &wr_buf, &pend);
 495         if (rc)
 496                 goto put_out;
 497         rkeyllc = (struct smc_llc_msg_confirm_rkey *)wr_buf;
 498         memset(rkeyllc, 0, sizeof(*rkeyllc));
 499         rkeyllc->hd.common.llc_type = SMC_LLC_CONFIRM_RKEY;
 500         smc_llc_init_msg_hdr(&rkeyllc->hd, send_link->lgr, sizeof(*rkeyllc));
 501
 502         rtok_ix = 1;
 503         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 504                 link = &send_link->lgr->lnk[i];
 505                 if (smc_link_active(link) && link != send_link) {
 506                         rkeyllc->rtoken[rtok_ix].link_id = link->link_id;
 507                         rkeyllc->rtoken[rtok_ix].rmb_key =
 508                                 htonl(rmb_desc->mr[link->link_idx]->rkey);
 509                         rkeyllc->rtoken[rtok_ix].rmb_vaddr = rmb_desc->is_vm ?
 510                                 cpu_to_be64((uintptr_t)rmb_desc->cpu_addr) :
 511                                 cpu_to_be64((u64)sg_dma_address
 512                                             (rmb_desc->sgt[link->link_idx].sgl));
 513                         rtok_ix++;
 514                 }
 515         }
 516         /* rkey of send_link is in rtoken[0] */
 517         rkeyllc->rtoken[0].num_rkeys = rtok_ix - 1;
 518         rkeyllc->rtoken[0].rmb_key =
 519                 htonl(rmb_desc->mr[send_link->link_idx]->rkey);
 520         rkeyllc->rtoken[0].rmb_vaddr = rmb_desc->is_vm ?
 521                 cpu_to_be64((uintptr_t)rmb_desc->cpu_addr) :
 522                 cpu_to_be64((u64)sg_dma_address
 523                             (rmb_desc->sgt[send_link->link_idx].sgl));
 524         /* send llc message */
 525         rc = smc_wr_tx_send(send_link, pend);
 526 put_out:
 527         smc_wr_tx_link_put(send_link);
 528         return rc;
 529 }
 530
 531 /* send LLC delete rkey request */
 532 static int smc_llc_send_delete_rkey(struct smc_link *link,
 533                                     struct smc_buf_desc *rmb_desc)
 534 {
 535         struct smc_llc_msg_delete_rkey *rkeyllc;
 536         struct smc_wr_tx_pend_priv *pend;
 537         struct smc_wr_buf *wr_buf;
 538         int rc;
 539
 540         if (!smc_wr_tx_link_hold(link))
 541                 return -ENOLINK;
 542         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 543         if (rc)
 544                 goto put_out;
 545         rkeyllc = (struct smc_llc_msg_delete_rkey *)wr_buf;
 546         memset(rkeyllc, 0, sizeof(*rkeyllc));
 547         rkeyllc->hd.common.llc_type = SMC_LLC_DELETE_RKEY;
 548         smc_llc_init_msg_hdr(&rkeyllc->hd, link->lgr, sizeof(*rkeyllc));
 549         rkeyllc->num_rkeys = 1;
 550         rkeyllc->rkey[0] = htonl(rmb_desc->mr[link->link_idx]->rkey);
 551         /* send llc message */
 552         rc = smc_wr_tx_send(link, pend);
 553 put_out:
 554         smc_wr_tx_link_put(link);
 555         return rc;
 556 }
 557
 558 /* return first buffer from any of the next buf lists */
 559 static struct smc_buf_desc *_smc_llc_get_next_rmb(struct smc_link_group *lgr,
 560                                                   int *buf_lst)
 561 {
 562         struct smc_buf_desc *buf_pos;
 563
 564         while (*buf_lst < SMC_RMBE_SIZES) {
 565                 buf_pos = list_first_entry_or_null(&lgr->rmbs[*buf_lst],
 566                                                    struct smc_buf_desc, list);
 567                 if (buf_pos)
 568                         return buf_pos;
 569                 (*buf_lst)++;
 570         }
 571         return NULL;
 572 }
 573
 574 /* return next rmb from buffer lists */
 575 static struct smc_buf_desc *smc_llc_get_next_rmb(struct smc_link_group *lgr,
 576                                                  int *buf_lst,
 577                                                  struct smc_buf_desc *buf_pos)
 578 {
 579         struct smc_buf_desc *buf_next;
 580
 581         if (!buf_pos || list_is_last(&buf_pos->list, &lgr->rmbs[*buf_lst])) {
 582                 (*buf_lst)++;
 583                 return _smc_llc_get_next_rmb(lgr, buf_lst);
 584         }
 585         buf_next = list_next_entry(buf_pos, list);
 586         return buf_next;
 587 }
 588
 589 static struct smc_buf_desc *smc_llc_get_first_rmb(struct smc_link_group *lgr,
 590                                                   int *buf_lst)
 591 {
 592         *buf_lst = 0;
 593         return smc_llc_get_next_rmb(lgr, buf_lst, NULL);
 594 }
 595
 596 static int smc_llc_fill_ext_v2(struct smc_llc_msg_add_link_v2_ext *ext,
 597                                struct smc_link *link, struct smc_link *link_new)
 598 {
 599         struct smc_link_group *lgr = link->lgr;
 600         struct smc_buf_desc *buf_pos;
 601         int prim_lnk_idx, lnk_idx, i;
 602         struct smc_buf_desc *rmb;
 603         int len = sizeof(*ext);
 604         int buf_lst;
 605
 606         ext->v2_direct = !lgr->uses_gateway;
 607         memcpy(ext->client_target_gid, link_new->gid, SMC_GID_SIZE);
 608
 609         prim_lnk_idx = link->link_idx;
 610         lnk_idx = link_new->link_idx;
 611         down_write(&lgr->rmbs_lock);
 612         ext->num_rkeys = lgr->conns_num;
 613         if (!ext->num_rkeys)
 614                 goto out;
 615         buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);
 616         for (i = 0; i < ext->num_rkeys; i++) {
 617                 if (!buf_pos)
 618                         break;
 619                 rmb = buf_pos;
 620                 ext->rt[i].rmb_key = htonl(rmb->mr[prim_lnk_idx]->rkey);
 621                 ext->rt[i].rmb_key_new = htonl(rmb->mr[lnk_idx]->rkey);
 622                 ext->rt[i].rmb_vaddr_new = rmb->is_vm ?
 623                         cpu_to_be64((uintptr_t)rmb->cpu_addr) :
 624                         cpu_to_be64((u64)sg_dma_address(rmb->sgt[lnk_idx].sgl));
 625                 buf_pos = smc_llc_get_next_rmb(lgr, &buf_lst, buf_pos);
 626                 while (buf_pos && !(buf_pos)->used)
 627                         buf_pos = smc_llc_get_next_rmb(lgr, &buf_lst, buf_pos);
 628         }
 629         len += i * sizeof(ext->rt[0]);
 630 out:
 631         up_write(&lgr->rmbs_lock);
 632         return len;
 633 }
 634
 635 /* send ADD LINK request or response */
 636 int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
 637                           struct smc_link *link_new,
 638                           enum smc_llc_reqresp reqresp)
 639 {
 640         struct smc_llc_msg_add_link_v2_ext *ext = NULL;
 641         struct smc_llc_msg_add_link *addllc;
 642         struct smc_wr_tx_pend_priv *pend;
 643         int len = sizeof(*addllc);
 644         int rc;
 645
 646         if (!smc_wr_tx_link_hold(link))
 647                 return -ENOLINK;
 648         if (link->lgr->smc_version == SMC_V2) {
 649                 struct smc_wr_v2_buf *wr_buf;
 650
 651                 rc = smc_llc_add_pending_send_v2(link, &wr_buf, &pend);
 652                 if (rc)
 653                         goto put_out;
 654                 addllc = (struct smc_llc_msg_add_link *)wr_buf;
 655                 ext = (struct smc_llc_msg_add_link_v2_ext *)
 656                                                 &wr_buf->raw[sizeof(*addllc)];
 657                 memset(ext, 0, SMC_WR_TX_SIZE);
 658         } else {
 659                 struct smc_wr_buf *wr_buf;
 660
 661                 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 662                 if (rc)
 663                         goto put_out;
 664                 addllc = (struct smc_llc_msg_add_link *)wr_buf;
 665         }
 666
 667         memset(addllc, 0, sizeof(*addllc));
 668         addllc->hd.common.llc_type = SMC_LLC_ADD_LINK;
 669         if (reqresp == SMC_LLC_RESP)
 670                 addllc->hd.flags |= SMC_LLC_FLAG_RESP;
 671         memcpy(addllc->sender_mac, mac, ETH_ALEN);
 672         memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
 673         if (link_new) {
 674                 addllc->link_num = link_new->link_id;
 675                 hton24(addllc->sender_qp_num, link_new->roce_qp->qp_num);
 676                 hton24(addllc->initial_psn, link_new->psn_initial);
 677                 if (reqresp == SMC_LLC_REQ)
 678                         addllc->qp_mtu = link_new->path_mtu;
 679                 else
 680                         addllc->qp_mtu = min(link_new->path_mtu,
 681                                              link_new->peer_mtu);
 682         }
 683         if (ext && link_new)
 684                 len += smc_llc_fill_ext_v2(ext, link, link_new);
 685         smc_llc_init_msg_hdr(&addllc->hd, link->lgr, len);
 686         /* send llc message */
 687         if (link->lgr->smc_version == SMC_V2)
 688                 rc = smc_wr_tx_v2_send(link, pend, len);
 689         else
 690                 rc = smc_wr_tx_send(link, pend);
 691 put_out:
 692         smc_wr_tx_link_put(link);
 693         return rc;
 694 }
 695
 696 /* send DELETE LINK request or response */
 697 int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
 698                              enum smc_llc_reqresp reqresp, bool orderly,
 699                              u32 reason)
 700 {
 701         struct smc_llc_msg_del_link *delllc;
 702         struct smc_wr_tx_pend_priv *pend;
 703         struct smc_wr_buf *wr_buf;
 704         int rc;
 705
 706         if (!smc_wr_tx_link_hold(link))
 707                 return -ENOLINK;
 708         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 709         if (rc)
 710                 goto put_out;
 711         delllc = (struct smc_llc_msg_del_link *)wr_buf;
 712
 713         memset(delllc, 0, sizeof(*delllc));
 714         delllc->hd.common.llc_type = SMC_LLC_DELETE_LINK;
 715         smc_llc_init_msg_hdr(&delllc->hd, link->lgr, sizeof(*delllc));
 716         if (reqresp == SMC_LLC_RESP)
 717                 delllc->hd.flags |= SMC_LLC_FLAG_RESP;
 718         if (orderly)
 719                 delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
 720         if (link_del_id)
 721                 delllc->link_num = link_del_id;
 722         else
 723                 delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
 724         delllc->reason = htonl(reason);
 725         /* send llc message */
 726         rc = smc_wr_tx_send(link, pend);
 727 put_out:
 728         smc_wr_tx_link_put(link);
 729         return rc;
 730 }
 731
 732 /* send LLC test link request */
 733 static int smc_llc_send_test_link(struct smc_link *link, u8 user_data[16])
 734 {
 735         struct smc_llc_msg_test_link *testllc;
 736         struct smc_wr_tx_pend_priv *pend;
 737         struct smc_wr_buf *wr_buf;
 738         int rc;
 739
 740         if (!smc_wr_tx_link_hold(link))
 741                 return -ENOLINK;
 742         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 743         if (rc)
 744                 goto put_out;
 745         testllc = (struct smc_llc_msg_test_link *)wr_buf;
 746         memset(testllc, 0, sizeof(*testllc));
 747         testllc->hd.common.llc_type = SMC_LLC_TEST_LINK;
 748         smc_llc_init_msg_hdr(&testllc->hd, link->lgr, sizeof(*testllc));
 749         memcpy(testllc->user_data, user_data, sizeof(testllc->user_data));
 750         /* send llc message */
 751         rc = smc_wr_tx_send(link, pend);
 752 put_out:
 753         smc_wr_tx_link_put(link);
 754         return rc;
 755 }
 756
 757 /* schedule an llc send on link, may wait for buffers */
 758 static int smc_llc_send_message(struct smc_link *link, void *llcbuf)
 759 {
 760         struct smc_wr_tx_pend_priv *pend;
 761         struct smc_wr_buf *wr_buf;
 762         int rc;
 763
 764         if (!smc_wr_tx_link_hold(link))
 765                 return -ENOLINK;
 766         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 767         if (rc)
 768                 goto put_out;
 769         memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg));
 770         rc = smc_wr_tx_send(link, pend);
 771 put_out:
 772         smc_wr_tx_link_put(link);
 773         return rc;
 774 }
 775
 776 /* schedule an llc send on link, may wait for buffers,
 777  * and wait for send completion notification.
 778  * @return 0 on success
 779  */
 780 static int smc_llc_send_message_wait(struct smc_link *link, void *llcbuf)
 781 {
 782         struct smc_wr_tx_pend_priv *pend;
 783         struct smc_wr_buf *wr_buf;
 784         int rc;
 785
 786         if (!smc_wr_tx_link_hold(link))
 787                 return -ENOLINK;
 788         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 789         if (rc)
 790                 goto put_out;
 791         memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg));
 792         rc = smc_wr_tx_send_wait(link, pend, SMC_LLC_WAIT_TIME);
 793 put_out:
 794         smc_wr_tx_link_put(link);
 795         return rc;
 796 }
 797
 798 /********************************* receive ***********************************/
 799
 800 static int smc_llc_alloc_alt_link(struct smc_link_group *lgr,
 801                                   enum smc_lgr_type lgr_new_t)
 802 {
 803         int i;
 804
 805         if (lgr->type == SMC_LGR_SYMMETRIC ||
 806             (lgr->type != SMC_LGR_SINGLE &&
 807              (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
 808               lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)))
 809                 return -EMLINK;
 810
 811         if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
 812             lgr_new_t == SMC_LGR_ASYMMETRIC_PEER) {
 813                 for (i = SMC_LINKS_PER_LGR_MAX - 1; i >= 0; i--)
 814                         if (lgr->lnk[i].state == SMC_LNK_UNUSED)
 815                                 return i;
 816         } else {
 817                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
 818                         if (lgr->lnk[i].state == SMC_LNK_UNUSED)
 819                                 return i;
 820         }
 821         return -EMLINK;
 822 }
 823
 824 /* send one add_link_continue msg */
 825 static int smc_llc_add_link_cont(struct smc_link *link,
 826                                  struct smc_link *link_new, u8 *num_rkeys_todo,
 827                                  int *buf_lst, struct smc_buf_desc **buf_pos)
 828 {
 829         struct smc_llc_msg_add_link_cont *addc_llc;
 830         struct smc_link_group *lgr = link->lgr;
 831         int prim_lnk_idx, lnk_idx, i, rc;
 832         struct smc_wr_tx_pend_priv *pend;
 833         struct smc_wr_buf *wr_buf;
 834         struct smc_buf_desc *rmb;
 835         u8 n;
 836
 837         if (!smc_wr_tx_link_hold(link))
 838                 return -ENOLINK;
 839         rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
 840         if (rc)
 841                 goto put_out;
 842         addc_llc = (struct smc_llc_msg_add_link_cont *)wr_buf;
 843         memset(addc_llc, 0, sizeof(*addc_llc));
 844
 845         prim_lnk_idx = link->link_idx;
 846         lnk_idx = link_new->link_idx;
 847         addc_llc->link_num = link_new->link_id;
 848         addc_llc->num_rkeys = *num_rkeys_todo;
 849         n = *num_rkeys_todo;
 850         for (i = 0; i < min_t(u8, n, SMC_LLC_RKEYS_PER_CONT_MSG); i++) {
 851                 if (!*buf_pos) {
 852                         addc_llc->num_rkeys = addc_llc->num_rkeys -
 853                                               *num_rkeys_todo;
 854                         *num_rkeys_todo = 0;
 855                         break;
 856                 }
 857                 rmb = *buf_pos;
 858
 859                 addc_llc->rt[i].rmb_key = htonl(rmb->mr[prim_lnk_idx]->rkey);
 860                 addc_llc->rt[i].rmb_key_new = htonl(rmb->mr[lnk_idx]->rkey);
 861                 addc_llc->rt[i].rmb_vaddr_new = rmb->is_vm ?
 862                         cpu_to_be64((uintptr_t)rmb->cpu_addr) :
 863                         cpu_to_be64((u64)sg_dma_address(rmb->sgt[lnk_idx].sgl));
 864
 865                 (*num_rkeys_todo)--;
 866                 *buf_pos = smc_llc_get_next_rmb(lgr, buf_lst, *buf_pos);
 867                 while (*buf_pos && !(*buf_pos)->used)
 868                         *buf_pos = smc_llc_get_next_rmb(lgr, buf_lst, *buf_pos);
 869         }
 870         addc_llc->hd.common.llc_type = SMC_LLC_ADD_LINK_CONT;
 871         addc_llc->hd.length = sizeof(struct smc_llc_msg_add_link_cont);
 872         if (lgr->role == SMC_CLNT)
 873                 addc_llc->hd.flags |= SMC_LLC_FLAG_RESP;
 874         rc = smc_wr_tx_send(link, pend);
 875 put_out:
 876         smc_wr_tx_link_put(link);
 877         return rc;
 878 }
 879
 880 static int smc_llc_cli_rkey_exchange(struct smc_link *link,
 881                                      struct smc_link *link_new)
 882 {
 883         struct smc_llc_msg_add_link_cont *addc_llc;
 884         struct smc_link_group *lgr = link->lgr;
 885         u8 max, num_rkeys_send, num_rkeys_recv;
 886         struct smc_llc_qentry *qentry;
 887         struct smc_buf_desc *buf_pos;
 888         int buf_lst;
 889         int rc = 0;
 890         int i;
 891
 892         down_write(&lgr->rmbs_lock);
 893         num_rkeys_send = lgr->conns_num;
 894         buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);
 895         do {
 896                 qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_TIME,
 897                                       SMC_LLC_ADD_LINK_CONT);
 898                 if (!qentry) {
 899                         rc = -ETIMEDOUT;
 900                         break;
 901                 }
 902                 addc_llc = &qentry->msg.add_link_cont;
 903                 num_rkeys_recv = addc_llc->num_rkeys;
 904                 max = min_t(u8, num_rkeys_recv, SMC_LLC_RKEYS_PER_CONT_MSG);
 905                 for (i = 0; i < max; i++) {
 906                         smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,
 907                                        addc_llc->rt[i].rmb_key,
 908                                        addc_llc->rt[i].rmb_vaddr_new,
 909                                        addc_llc->rt[i].rmb_key_new);
 910                         num_rkeys_recv--;
 911                 }
 912                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
 913                 rc = smc_llc_add_link_cont(link, link_new, &num_rkeys_send,
 914                                            &buf_lst, &buf_pos);
 915                 if (rc)
 916                         break;
 917         } while (num_rkeys_send || num_rkeys_recv);
 918
 919         up_write(&lgr->rmbs_lock);
 920         return rc;
 921 }
 922
 923 /* prepare and send an add link reject response */
 924 static int smc_llc_cli_add_link_reject(struct smc_llc_qentry *qentry)
 925 {
 926         qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
 927         qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
 928         qentry->msg.raw.hdr.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
 929         smc_llc_init_msg_hdr(&qentry->msg.raw.hdr, qentry->link->lgr,
 930                              sizeof(qentry->msg));
 931         return smc_llc_send_message(qentry->link, &qentry->msg);
 932 }
 933
 934 static int smc_llc_cli_conf_link(struct smc_link *link,
 935                                  struct smc_init_info *ini,
 936                                  struct smc_link *link_new,
 937                                  enum smc_lgr_type lgr_new_t)
 938 {
 939         struct smc_link_group *lgr = link->lgr;
 940         struct smc_llc_qentry *qentry = NULL;
 941         int rc = 0;
 942
 943         /* receive CONFIRM LINK request over RoCE fabric */
 944         qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_FIRST_TIME, 0);
 945         if (!qentry) {
 946                 rc = smc_llc_send_delete_link(link, link_new->link_id,
 947                                               SMC_LLC_REQ, false,
 948                                               SMC_LLC_DEL_LOST_PATH);
 949                 return -ENOLINK;
 950         }
 951         if (qentry->msg.raw.hdr.common.llc_type != SMC_LLC_CONFIRM_LINK) {
 952                 /* received DELETE_LINK instead */
 953                 qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
 954                 smc_llc_send_message(link, &qentry->msg);
 955                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
 956                 return -ENOLINK;
 957         }
 958         smc_llc_save_peer_uid(qentry);
 959         smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
 960
 961         rc = smc_ib_modify_qp_rts(link_new);
 962         if (rc) {
 963                 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
 964                                          false, SMC_LLC_DEL_LOST_PATH);
 965                 return -ENOLINK;
 966         }
 967         smc_wr_remember_qp_attr(link_new);
 968
 969         rc = smcr_buf_reg_lgr(link_new);
 970         if (rc) {
 971                 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
 972                                          false, SMC_LLC_DEL_LOST_PATH);
 973                 return -ENOLINK;
 974         }
 975
 976         /* send CONFIRM LINK response over RoCE fabric */
 977         rc = smc_llc_send_confirm_link(link_new, SMC_LLC_RESP);
 978         if (rc) {
 979                 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
 980                                          false, SMC_LLC_DEL_LOST_PATH);
 981                 return -ENOLINK;
 982         }
 983         smc_llc_link_active(link_new);
 984         if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
 985             lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)
 986                 smcr_lgr_set_type_asym(lgr, lgr_new_t, link_new->link_idx);
 987         else
 988                 smcr_lgr_set_type(lgr, lgr_new_t);
 989         return 0;
 990 }
 991
 992 static void smc_llc_save_add_link_rkeys(struct smc_link *link,
 993                                         struct smc_link *link_new)
 994 {
 995         struct smc_llc_msg_add_link_v2_ext *ext;
 996         struct smc_link_group *lgr = link->lgr;
 997         int max, i;
 998
 999         ext = (struct smc_llc_msg_add_link_v2_ext *)((u8 *)lgr->wr_rx_buf_v2 +
1000                                                      SMC_WR_TX_SIZE);
1001         max = min_t(u8, ext->num_rkeys, SMC_LLC_RKEYS_PER_MSG_V2);
1002         down_write(&lgr->rmbs_lock);
1003         for (i = 0; i < max; i++) {
1004                 smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,
1005                                ext->rt[i].rmb_key,
1006                                ext->rt[i].rmb_vaddr_new,
1007                                ext->rt[i].rmb_key_new);
1008         }
1009         up_write(&lgr->rmbs_lock);
1010 }
1011
1012 static void smc_llc_save_add_link_info(struct smc_link *link,
1013                                        struct smc_llc_msg_add_link *add_llc)
1014 {
1015         link->peer_qpn = ntoh24(add_llc->sender_qp_num);
1016         memcpy(link->peer_gid, add_llc->sender_gid, SMC_GID_SIZE);
1017         memcpy(link->peer_mac, add_llc->sender_mac, ETH_ALEN);
1018         link->peer_psn = ntoh24(add_llc->initial_psn);
1019         link->peer_mtu = add_llc->qp_mtu;
1020 }
1021
1022 /* as an SMC client, process an add link request */
1023 int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
1024 {
1025         struct smc_llc_msg_add_link *llc = &qentry->msg.add_link;
1026         enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
1027         struct smc_link_group *lgr = smc_get_lgr(link);
1028         struct smc_init_info *ini = NULL;
1029         struct smc_link *lnk_new = NULL;
1030         int lnk_idx, rc = 0;
1031
1032         if (!llc->qp_mtu)
1033                 goto out_reject;
1034
1035         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1036         if (!ini) {
1037                 rc = -ENOMEM;
1038                 goto out_reject;
1039         }
1040
1041         ini->vlan_id = lgr->vlan_id;
1042         if (lgr->smc_version == SMC_V2) {
1043                 ini->check_smcrv2 = true;
1044                 ini->smcrv2.saddr = lgr->saddr;
1045                 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(llc->sender_gid);
1046         }
1047         smc_pnet_find_alt_roce(lgr, ini, link->smcibdev);
1048         if (!memcmp(llc->sender_gid, link->peer_gid, SMC_GID_SIZE) &&
1049             (lgr->smc_version == SMC_V2 ||
1050              !memcmp(llc->sender_mac, link->peer_mac, ETH_ALEN))) {
1051                 if (!ini->ib_dev && !ini->smcrv2.ib_dev_v2)
1052                         goto out_reject;
1053                 lgr_new_t = SMC_LGR_ASYMMETRIC_PEER;
1054         }
1055         if (lgr->smc_version == SMC_V2 && !ini->smcrv2.ib_dev_v2) {
1056                 lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
1057                 ini->smcrv2.ib_dev_v2 = link->smcibdev;
1058                 ini->smcrv2.ib_port_v2 = link->ibport;
1059         } else if (lgr->smc_version < SMC_V2 && !ini->ib_dev) {
1060                 lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
1061                 ini->ib_dev = link->smcibdev;
1062                 ini->ib_port = link->ibport;
1063         }
1064         lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
1065         if (lnk_idx < 0)
1066                 goto out_reject;
1067         lnk_new = &lgr->lnk[lnk_idx];
1068         rc = smcr_link_init(lgr, lnk_new, lnk_idx, ini);
1069         if (rc)
1070                 goto out_reject;
1071         smc_llc_save_add_link_info(lnk_new, llc);
1072         lnk_new->link_id = llc->link_num;       /* SMC server assigns link id */
1073         smc_llc_link_set_uid(lnk_new);
1074
1075         rc = smc_ib_ready_link(lnk_new);
1076         if (rc)
1077                 goto out_clear_lnk;
1078
1079         rc = smcr_buf_map_lgr(lnk_new);
1080         if (rc)
1081                 goto out_clear_lnk;
1082
1083         rc = smc_llc_send_add_link(link,
1084                                    lnk_new->smcibdev->mac[lnk_new->ibport - 1],
1085                                    lnk_new->gid, lnk_new, SMC_LLC_RESP);
1086         if (rc)
1087                 goto out_clear_lnk;
1088         if (lgr->smc_version == SMC_V2) {
1089                 smc_llc_save_add_link_rkeys(link, lnk_new);
1090         } else {
1091                 rc = smc_llc_cli_rkey_exchange(link, lnk_new);
1092                 if (rc) {
1093                         rc = 0;
1094                         goto out_clear_lnk;
1095                 }
1096         }
1097         rc = smc_llc_cli_conf_link(link, ini, lnk_new, lgr_new_t);
1098         if (!rc)
1099                 goto out;
1100 out_clear_lnk:
1101         lnk_new->state = SMC_LNK_INACTIVE;
1102         smcr_link_clear(lnk_new, false);
1103 out_reject:
1104         smc_llc_cli_add_link_reject(qentry);
1105 out:
1106         kfree(ini);
1107         kfree(qentry);
1108         return rc;
1109 }
1110
1111 static void smc_llc_send_request_add_link(struct smc_link *link)
1112 {
1113         struct smc_llc_msg_req_add_link_v2 *llc;
1114         struct smc_wr_tx_pend_priv *pend;
1115         struct smc_wr_v2_buf *wr_buf;
1116         struct smc_gidlist gidlist;
1117         int rc, len, i;
1118
1119         if (!smc_wr_tx_link_hold(link))
1120                 return;
1121         if (link->lgr->type == SMC_LGR_SYMMETRIC ||
1122             link->lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1123                 goto put_out;
1124
1125         smc_fill_gid_list(link->lgr, &gidlist, link->smcibdev, link->gid);
1126         if (gidlist.len <= 1)
1127                 goto put_out;
1128
1129         rc = smc_llc_add_pending_send_v2(link, &wr_buf, &pend);
1130         if (rc)
1131                 goto put_out;
1132         llc = (struct smc_llc_msg_req_add_link_v2 *)wr_buf;
1133         memset(llc, 0, SMC_WR_TX_SIZE);
1134
1135         llc->hd.common.llc_type = SMC_LLC_REQ_ADD_LINK;
1136         for (i = 0; i < gidlist.len; i++)
1137                 memcpy(llc->gid[i], gidlist.list[i], sizeof(gidlist.list[0]));
1138         llc->gid_cnt = gidlist.len;
1139         len = sizeof(*llc) + (gidlist.len * sizeof(gidlist.list[0]));
1140         smc_llc_init_msg_hdr(&llc->hd, link->lgr, len);
1141         rc = smc_wr_tx_v2_send(link, pend, len);
1142         if (!rc)
1143                 /* set REQ_ADD_LINK flow and wait for response from peer */
1144                 link->lgr->llc_flow_lcl.type = SMC_LLC_FLOW_REQ_ADD_LINK;
1145 put_out:
1146         smc_wr_tx_link_put(link);
1147 }
1148
1149 /* as an SMC client, invite server to start the add_link processing */
1150 static void smc_llc_cli_add_link_invite(struct smc_link *link,
1151                                         struct smc_llc_qentry *qentry)
1152 {
1153         struct smc_link_group *lgr = smc_get_lgr(link);
1154         struct smc_init_info *ini = NULL;
1155
1156         if (lgr->smc_version == SMC_V2) {
1157                 smc_llc_send_request_add_link(link);
1158                 goto out;
1159         }
1160
1161         if (lgr->type == SMC_LGR_SYMMETRIC ||
1162             lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1163                 goto out;
1164
1165         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1166         if (!ini)
1167                 goto out;
1168
1169         ini->vlan_id = lgr->vlan_id;
1170         smc_pnet_find_alt_roce(lgr, ini, link->smcibdev);
1171         if (!ini->ib_dev)
1172                 goto out;
1173
1174         smc_llc_send_add_link(link, ini->ib_dev->mac[ini->ib_port - 1],
1175                               ini->ib_gid, NULL, SMC_LLC_REQ);
1176 out:
1177         kfree(ini);
1178         kfree(qentry);
1179 }
1180
1181 static bool smc_llc_is_empty_llc_message(union smc_llc_msg *llc)
1182 {
1183         int i;
1184
1185         for (i = 0; i < ARRAY_SIZE(llc->raw.data); i++)
1186                 if (llc->raw.data[i])
1187                         return false;
1188         return true;
1189 }
1190
1191 static bool smc_llc_is_local_add_link(union smc_llc_msg *llc)
1192 {
1193         if (llc->raw.hdr.common.llc_type == SMC_LLC_ADD_LINK &&
1194             smc_llc_is_empty_llc_message(llc))
1195                 return true;
1196         return false;
1197 }
1198
1199 static void smc_llc_process_cli_add_link(struct smc_link_group *lgr)
1200 {
1201         struct smc_llc_qentry *qentry;
1202
1203         qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
1204
1205         down_write(&lgr->llc_conf_mutex);
1206         if (smc_llc_is_local_add_link(&qentry->msg))
1207                 smc_llc_cli_add_link_invite(qentry->link, qentry);
1208         else
1209                 smc_llc_cli_add_link(qentry->link, qentry);
1210         up_write(&lgr->llc_conf_mutex);
1211 }
1212
1213 static int smc_llc_active_link_count(struct smc_link_group *lgr)
1214 {
1215         int i, link_count = 0;
1216
1217         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1218                 if (!smc_link_active(&lgr->lnk[i]))
1219                         continue;
1220                 link_count++;
1221         }
1222         return link_count;
1223 }
1224
1225 /* find the asymmetric link when 3 links are established  */
1226 static struct smc_link *smc_llc_find_asym_link(struct smc_link_group *lgr)
1227 {
1228         int asym_idx = -ENOENT;
1229         int i, j, k;
1230         bool found;
1231
1232         /* determine asymmetric link */
1233         found = false;
1234         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1235                 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
1236                         if (!smc_link_usable(&lgr->lnk[i]) ||
1237                             !smc_link_usable(&lgr->lnk[j]))
1238                                 continue;
1239                         if (!memcmp(lgr->lnk[i].gid, lgr->lnk[j].gid,
1240                                     SMC_GID_SIZE)) {
1241                                 found = true;   /* asym_lnk is i or j */
1242                                 break;
1243                         }
1244                 }
1245                 if (found)
1246                         break;
1247         }
1248         if (!found)
1249                 goto out; /* no asymmetric link */
1250         for (k = 0; k < SMC_LINKS_PER_LGR_MAX; k++) {
1251                 if (!smc_link_usable(&lgr->lnk[k]))
1252                         continue;
1253                 if (k != i &&
1254                     !memcmp(lgr->lnk[i].peer_gid, lgr->lnk[k].peer_gid,
1255                             SMC_GID_SIZE)) {
1256                         asym_idx = i;
1257                         break;
1258                 }
1259                 if (k != j &&
1260                     !memcmp(lgr->lnk[j].peer_gid, lgr->lnk[k].peer_gid,
1261                             SMC_GID_SIZE)) {
1262                         asym_idx = j;
1263                         break;
1264                 }
1265         }
1266 out:
1267         return (asym_idx < 0) ? NULL : &lgr->lnk[asym_idx];
1268 }
1269
1270 static void smc_llc_delete_asym_link(struct smc_link_group *lgr)
1271 {
1272         struct smc_link *lnk_new = NULL, *lnk_asym;
1273         struct smc_llc_qentry *qentry;
1274         int rc;
1275
1276         lnk_asym = smc_llc_find_asym_link(lgr);
1277         if (!lnk_asym)
1278                 return; /* no asymmetric link */
1279         if (!smc_link_downing(&lnk_asym->state))
1280                 return;
1281         lnk_new = smc_switch_conns(lgr, lnk_asym, false);
1282         smc_wr_tx_wait_no_pending_sends(lnk_asym);
1283         if (!lnk_new)
1284                 goto out_free;
1285         /* change flow type from ADD_LINK into DEL_LINK */
1286         lgr->llc_flow_lcl.type = SMC_LLC_FLOW_DEL_LINK;
1287         rc = smc_llc_send_delete_link(lnk_new, lnk_asym->link_id, SMC_LLC_REQ,
1288                                       true, SMC_LLC_DEL_NO_ASYM_NEEDED);
1289         if (rc) {
1290                 smcr_link_down_cond(lnk_new);
1291                 goto out_free;
1292         }
1293         qentry = smc_llc_wait(lgr, lnk_new, SMC_LLC_WAIT_TIME,
1294                               SMC_LLC_DELETE_LINK);
1295         if (!qentry) {
1296                 smcr_link_down_cond(lnk_new);
1297                 goto out_free;
1298         }
1299         smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1300 out_free:
1301         smcr_link_clear(lnk_asym, true);
1302 }
1303
1304 static int smc_llc_srv_rkey_exchange(struct smc_link *link,
1305                                      struct smc_link *link_new)
1306 {
1307         struct smc_llc_msg_add_link_cont *addc_llc;
1308         struct smc_link_group *lgr = link->lgr;
1309         u8 max, num_rkeys_send, num_rkeys_recv;
1310         struct smc_llc_qentry *qentry = NULL;
1311         struct smc_buf_desc *buf_pos;
1312         int buf_lst;
1313         int rc = 0;
1314         int i;
1315
1316         down_write(&lgr->rmbs_lock);
1317         num_rkeys_send = lgr->conns_num;
1318         buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);
1319         do {
1320                 smc_llc_add_link_cont(link, link_new, &num_rkeys_send,
1321                                       &buf_lst, &buf_pos);
1322                 qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME,
1323                                       SMC_LLC_ADD_LINK_CONT);
1324                 if (!qentry) {
1325                         rc = -ETIMEDOUT;
1326                         goto out;
1327                 }
1328                 addc_llc = &qentry->msg.add_link_cont;
1329                 num_rkeys_recv = addc_llc->num_rkeys;
1330                 max = min_t(u8, num_rkeys_recv, SMC_LLC_RKEYS_PER_CONT_MSG);
1331                 for (i = 0; i < max; i++) {
1332                         smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,
1333                                        addc_llc->rt[i].rmb_key,
1334                                        addc_llc->rt[i].rmb_vaddr_new,
1335                                        addc_llc->rt[i].rmb_key_new);
1336                         num_rkeys_recv--;
1337                 }
1338                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1339         } while (num_rkeys_send || num_rkeys_recv);
1340 out:
1341         up_write(&lgr->rmbs_lock);
1342         return rc;
1343 }
1344
1345 static int smc_llc_srv_conf_link(struct smc_link *link,
1346                                  struct smc_link *link_new,
1347                                  enum smc_lgr_type lgr_new_t)
1348 {
1349         struct smc_link_group *lgr = link->lgr;
1350         struct smc_llc_qentry *qentry = NULL;
1351         int rc;
1352
1353         /* send CONFIRM LINK request over the RoCE fabric */
1354         rc = smc_llc_send_confirm_link(link_new, SMC_LLC_REQ);
1355         if (rc)
1356                 return -ENOLINK;
1357         /* receive CONFIRM LINK response over the RoCE fabric */
1358         qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_FIRST_TIME, 0);
1359         if (!qentry ||
1360             qentry->msg.raw.hdr.common.llc_type != SMC_LLC_CONFIRM_LINK) {
1361                 /* send DELETE LINK */
1362                 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
1363                                          false, SMC_LLC_DEL_LOST_PATH);
1364                 if (qentry)
1365                         smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1366                 return -ENOLINK;
1367         }
1368         smc_llc_save_peer_uid(qentry);
1369         smc_llc_link_active(link_new);
1370         if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
1371             lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)
1372                 smcr_lgr_set_type_asym(lgr, lgr_new_t, link_new->link_idx);
1373         else
1374                 smcr_lgr_set_type(lgr, lgr_new_t);
1375         smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1376         return 0;
1377 }
1378
1379 static void smc_llc_send_req_add_link_response(struct smc_llc_qentry *qentry)
1380 {
1381         qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
1382         smc_llc_init_msg_hdr(&qentry->msg.raw.hdr, qentry->link->lgr,
1383                              sizeof(qentry->msg));
1384         memset(&qentry->msg.raw.data, 0, sizeof(qentry->msg.raw.data));
1385         smc_llc_send_message(qentry->link, &qentry->msg);
1386 }
1387
1388 int smc_llc_srv_add_link(struct smc_link *link,
1389                          struct smc_llc_qentry *req_qentry)
1390 {
1391         enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
1392         struct smc_link_group *lgr = link->lgr;
1393         struct smc_llc_msg_add_link *add_llc;
1394         struct smc_llc_qentry *qentry = NULL;
1395         bool send_req_add_link_resp = false;
1396         struct smc_link *link_new = NULL;
1397         struct smc_init_info *ini = NULL;
1398         int lnk_idx, rc = 0;
1399
1400         if (req_qentry &&
1401             req_qentry->msg.raw.hdr.common.llc_type == SMC_LLC_REQ_ADD_LINK)
1402                 send_req_add_link_resp = true;
1403
1404         ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1405         if (!ini) {
1406                 rc = -ENOMEM;
1407                 goto out;
1408         }
1409
1410         /* ignore client add link recommendation, start new flow */
1411         ini->vlan_id = lgr->vlan_id;
1412         if (lgr->smc_version == SMC_V2) {
1413                 ini->check_smcrv2 = true;
1414                 ini->smcrv2.saddr = lgr->saddr;
1415                 if (send_req_add_link_resp) {
1416                         struct smc_llc_msg_req_add_link_v2 *req_add =
1417                                 &req_qentry->msg.req_add_link;
1418
1419                         ini->smcrv2.daddr = smc_ib_gid_to_ipv4(req_add->gid[0]);
1420                 }
1421         }
1422         smc_pnet_find_alt_roce(lgr, ini, link->smcibdev);
1423         if (lgr->smc_version == SMC_V2 && !ini->smcrv2.ib_dev_v2) {
1424                 lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
1425                 ini->smcrv2.ib_dev_v2 = link->smcibdev;
1426                 ini->smcrv2.ib_port_v2 = link->ibport;
1427         } else if (lgr->smc_version < SMC_V2 && !ini->ib_dev) {
1428                 lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
1429                 ini->ib_dev = link->smcibdev;
1430                 ini->ib_port = link->ibport;
1431         }
1432         lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
1433         if (lnk_idx < 0) {
1434                 rc = 0;
1435                 goto out;
1436         }
1437
1438         rc = smcr_link_init(lgr, &lgr->lnk[lnk_idx], lnk_idx, ini);
1439         if (rc)
1440                 goto out;
1441         link_new = &lgr->lnk[lnk_idx];
1442
1443         rc = smcr_buf_map_lgr(link_new);
1444         if (rc)
1445                 goto out_err;
1446
1447         rc = smc_llc_send_add_link(link,
1448                                    link_new->smcibdev->mac[link_new->ibport-1],
1449                                    link_new->gid, link_new, SMC_LLC_REQ);
1450         if (rc)
1451                 goto out_err;
1452         send_req_add_link_resp = false;
1453         /* receive ADD LINK response over the RoCE fabric */
1454         qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME, SMC_LLC_ADD_LINK);
1455         if (!qentry) {
1456                 rc = -ETIMEDOUT;
1457                 goto out_err;
1458         }
1459         add_llc = &qentry->msg.add_link;
1460         if (add_llc->hd.flags & SMC_LLC_FLAG_ADD_LNK_REJ) {
1461                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1462                 rc = -ENOLINK;
1463                 goto out_err;
1464         }
1465         if (lgr->type == SMC_LGR_SINGLE &&
1466             (!memcmp(add_llc->sender_gid, link->peer_gid, SMC_GID_SIZE) &&
1467              (lgr->smc_version == SMC_V2 ||
1468               !memcmp(add_llc->sender_mac, link->peer_mac, ETH_ALEN)))) {
1469                 lgr_new_t = SMC_LGR_ASYMMETRIC_PEER;
1470         }
1471         smc_llc_save_add_link_info(link_new, add_llc);
1472         smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1473
1474         rc = smc_ib_ready_link(link_new);
1475         if (rc)
1476                 goto out_err;
1477         rc = smcr_buf_reg_lgr(link_new);
1478         if (rc)
1479                 goto out_err;
1480         if (lgr->smc_version == SMC_V2) {
1481                 smc_llc_save_add_link_rkeys(link, link_new);
1482         } else {
1483                 rc = smc_llc_srv_rkey_exchange(link, link_new);
1484                 if (rc)
1485                         goto out_err;
1486         }
1487         rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t);
1488         if (rc)
1489                 goto out_err;
1490         kfree(ini);
1491         return 0;
1492 out_err:
1493         if (link_new) {
1494                 link_new->state = SMC_LNK_INACTIVE;
1495                 smcr_link_clear(link_new, false);
1496         }
1497 out:
1498         kfree(ini);
1499         if (send_req_add_link_resp)
1500                 smc_llc_send_req_add_link_response(req_qentry);
1501         return rc;
1502 }
1503
1504 static void smc_llc_process_srv_add_link(struct smc_link_group *lgr)
1505 {
1506         struct smc_link *link = lgr->llc_flow_lcl.qentry->link;
1507         struct smc_llc_qentry *qentry;
1508         int rc;
1509
1510         qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
1511
1512         down_write(&lgr->llc_conf_mutex);
1513         rc = smc_llc_srv_add_link(link, qentry);
1514         if (!rc && lgr->type == SMC_LGR_SYMMETRIC) {
1515                 /* delete any asymmetric link */
1516                 smc_llc_delete_asym_link(lgr);
1517         }
1518         up_write(&lgr->llc_conf_mutex);
1519         kfree(qentry);
1520 }
1521
1522 /* enqueue a local add_link req to trigger a new add_link flow */
1523 void smc_llc_add_link_local(struct smc_link *link)
1524 {
1525         struct smc_llc_msg_add_link add_llc = {};
1526
1527         add_llc.hd.common.llc_type = SMC_LLC_ADD_LINK;
1528         smc_llc_init_msg_hdr(&add_llc.hd, link->lgr, sizeof(add_llc));
1529         /* no dev and port needed */
1530         smc_llc_enqueue(link, (union smc_llc_msg *)&add_llc);
1531 }
1532
1533 /* worker to process an add link message */
1534 static void smc_llc_add_link_work(struct work_struct *work)
1535 {
1536         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
1537                                                   llc_add_link_work);
1538
1539         if (list_empty(&lgr->list)) {
1540                 /* link group is terminating */
1541                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1542                 goto out;
1543         }
1544
1545         if (lgr->role == SMC_CLNT)
1546                 smc_llc_process_cli_add_link(lgr);
1547         else
1548                 smc_llc_process_srv_add_link(lgr);
1549 out:
1550         if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_REQ_ADD_LINK)
1551                 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1552 }
1553
1554 /* enqueue a local del_link msg to trigger a new del_link flow,
1555  * called only for role SMC_SERV
1556  */
1557 void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id)
1558 {
1559         struct smc_llc_msg_del_link del_llc = {};
1560
1561         del_llc.hd.common.llc_type = SMC_LLC_DELETE_LINK;
1562         smc_llc_init_msg_hdr(&del_llc.hd, link->lgr, sizeof(del_llc));
1563         del_llc.link_num = del_link_id;
1564         del_llc.reason = htonl(SMC_LLC_DEL_LOST_PATH);
1565         del_llc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
1566         smc_llc_enqueue(link, (union smc_llc_msg *)&del_llc);
1567 }
1568
1569 static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr)
1570 {
1571         struct smc_link *lnk_del = NULL, *lnk_asym, *lnk;
1572         struct smc_llc_msg_del_link *del_llc;
1573         struct smc_llc_qentry *qentry;
1574         int active_links;
1575         int lnk_idx;
1576
1577         qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
1578         lnk = qentry->link;
1579         del_llc = &qentry->msg.delete_link;
1580
1581         if (del_llc->hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
1582                 smc_lgr_terminate_sched(lgr);
1583                 goto out;
1584         }
1585         down_write(&lgr->llc_conf_mutex);
1586         /* delete single link */
1587         for (lnk_idx = 0; lnk_idx < SMC_LINKS_PER_LGR_MAX; lnk_idx++) {
1588                 if (lgr->lnk[lnk_idx].link_id != del_llc->link_num)
1589                         continue;
1590                 lnk_del = &lgr->lnk[lnk_idx];
1591                 break;
1592         }
1593         del_llc->hd.flags |= SMC_LLC_FLAG_RESP;
1594         if (!lnk_del) {
1595                 /* link was not found */
1596                 del_llc->reason = htonl(SMC_LLC_DEL_NOLNK);
1597                 smc_llc_send_message(lnk, &qentry->msg);
1598                 goto out_unlock;
1599         }
1600         lnk_asym = smc_llc_find_asym_link(lgr);
1601
1602         del_llc->reason = 0;
1603         smc_llc_send_message(lnk, &qentry->msg); /* response */
1604
1605         if (smc_link_downing(&lnk_del->state))
1606                 smc_switch_conns(lgr, lnk_del, false);
1607         smcr_link_clear(lnk_del, true);
1608
1609         active_links = smc_llc_active_link_count(lgr);
1610         if (lnk_del == lnk_asym) {
1611                 /* expected deletion of asym link, don't change lgr state */
1612         } else if (active_links == 1) {
1613                 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1614         } else if (!active_links) {
1615                 smcr_lgr_set_type(lgr, SMC_LGR_NONE);
1616                 smc_lgr_terminate_sched(lgr);
1617         }
1618 out_unlock:
1619         up_write(&lgr->llc_conf_mutex);
1620 out:
1621         kfree(qentry);
1622 }
1623
1624 /* try to send a DELETE LINK ALL request on any active link,
1625  * waiting for send completion
1626  */
1627 void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord, u32 rsn)
1628 {
1629         struct smc_llc_msg_del_link delllc = {};
1630         int i;
1631
1632         delllc.hd.common.llc_type = SMC_LLC_DELETE_LINK;
1633         smc_llc_init_msg_hdr(&delllc.hd, lgr, sizeof(delllc));
1634         if (ord)
1635                 delllc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
1636         delllc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
1637         delllc.reason = htonl(rsn);
1638
1639         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1640                 if (!smc_link_sendable(&lgr->lnk[i]))
1641                         continue;
1642                 if (!smc_llc_send_message_wait(&lgr->lnk[i], &delllc))
1643                         break;
1644         }
1645 }
1646
1647 static void smc_llc_process_srv_delete_link(struct smc_link_group *lgr)
1648 {
1649         struct smc_llc_msg_del_link *del_llc;
1650         struct smc_link *lnk, *lnk_del;
1651         struct smc_llc_qentry *qentry;
1652         int active_links;
1653         int i;
1654
1655         down_write(&lgr->llc_conf_mutex);
1656         qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
1657         lnk = qentry->link;
1658         del_llc = &qentry->msg.delete_link;
1659
1660         if (qentry->msg.delete_link.hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
1661                 /* delete entire lgr */
1662                 smc_llc_send_link_delete_all(lgr, true, ntohl(
1663                                               qentry->msg.delete_link.reason));
1664                 smc_lgr_terminate_sched(lgr);
1665                 goto out;
1666         }
1667         /* delete single link */
1668         lnk_del = NULL;
1669         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1670                 if (lgr->lnk[i].link_id == del_llc->link_num) {
1671                         lnk_del = &lgr->lnk[i];
1672                         break;
1673                 }
1674         }
1675         if (!lnk_del)
1676                 goto out; /* asymmetric link already deleted */
1677
1678         if (smc_link_downing(&lnk_del->state)) {
1679                 if (smc_switch_conns(lgr, lnk_del, false))
1680                         smc_wr_tx_wait_no_pending_sends(lnk_del);
1681         }
1682         if (!list_empty(&lgr->list)) {
1683                 /* qentry is either a request from peer (send it back to
1684                  * initiate the DELETE_LINK processing), or a locally
1685                  * enqueued DELETE_LINK request (forward it)
1686                  */
1687                 if (!smc_llc_send_message(lnk, &qentry->msg)) {
1688                         struct smc_llc_qentry *qentry2;
1689
1690                         qentry2 = smc_llc_wait(lgr, lnk, SMC_LLC_WAIT_TIME,
1691                                                SMC_LLC_DELETE_LINK);
1692                         if (qentry2)
1693                                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1694                 }
1695         }
1696         smcr_link_clear(lnk_del, true);
1697
1698         active_links = smc_llc_active_link_count(lgr);
1699         if (active_links == 1) {
1700                 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1701         } else if (!active_links) {
1702                 smcr_lgr_set_type(lgr, SMC_LGR_NONE);
1703                 smc_lgr_terminate_sched(lgr);
1704         }
1705
1706         if (lgr->type == SMC_LGR_SINGLE && !list_empty(&lgr->list)) {
1707                 /* trigger setup of asymm alt link */
1708                 smc_llc_add_link_local(lnk);
1709         }
1710 out:
1711         up_write(&lgr->llc_conf_mutex);
1712         kfree(qentry);
1713 }
1714
1715 static void smc_llc_delete_link_work(struct work_struct *work)
1716 {
1717         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
1718                                                   llc_del_link_work);
1719
1720         if (list_empty(&lgr->list)) {
1721                 /* link group is terminating */
1722                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1723                 goto out;
1724         }
1725
1726         if (lgr->role == SMC_CLNT)
1727                 smc_llc_process_cli_delete_link(lgr);
1728         else
1729                 smc_llc_process_srv_delete_link(lgr);
1730 out:
1731         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1732 }
1733
1734 /* process a confirm_rkey request from peer, remote flow */
1735 static void smc_llc_rmt_conf_rkey(struct smc_link_group *lgr)
1736 {
1737         struct smc_llc_msg_confirm_rkey *llc;
1738         struct smc_llc_qentry *qentry;
1739         struct smc_link *link;
1740         int num_entries;
1741         int rk_idx;
1742         int i;
1743
1744         qentry = lgr->llc_flow_rmt.qentry;
1745         llc = &qentry->msg.confirm_rkey;
1746         link = qentry->link;
1747
1748         num_entries = llc->rtoken[0].num_rkeys;
1749         if (num_entries > SMC_LLC_RKEYS_PER_MSG)
1750                 goto out_err;
1751         /* first rkey entry is for receiving link */
1752         rk_idx = smc_rtoken_add(link,
1753                                 llc->rtoken[0].rmb_vaddr,
1754                                 llc->rtoken[0].rmb_key);
1755         if (rk_idx < 0)
1756                 goto out_err;
1757
1758         for (i = 1; i <= min_t(u8, num_entries, SMC_LLC_RKEYS_PER_MSG - 1); i++)
1759                 smc_rtoken_set2(lgr, rk_idx, llc->rtoken[i].link_id,
1760                                 llc->rtoken[i].rmb_vaddr,
1761                                 llc->rtoken[i].rmb_key);
1762         /* max links is 3 so there is no need to support conf_rkey_cont msgs */
1763         goto out;
1764 out_err:
1765         llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
1766         llc->hd.flags |= SMC_LLC_FLAG_RKEY_RETRY;
1767 out:
1768         llc->hd.flags |= SMC_LLC_FLAG_RESP;
1769         smc_llc_init_msg_hdr(&llc->hd, link->lgr, sizeof(*llc));
1770         smc_llc_send_message(link, &qentry->msg);
1771         smc_llc_flow_qentry_del(&lgr->llc_flow_rmt);
1772 }
1773
1774 /* process a delete_rkey request from peer, remote flow */
1775 static void smc_llc_rmt_delete_rkey(struct smc_link_group *lgr)
1776 {
1777         struct smc_llc_msg_delete_rkey *llc;
1778         struct smc_llc_qentry *qentry;
1779         struct smc_link *link;
1780         u8 err_mask = 0;
1781         int i, max;
1782
1783         qentry = lgr->llc_flow_rmt.qentry;
1784         llc = &qentry->msg.delete_rkey;
1785         link = qentry->link;
1786
1787         if (lgr->smc_version == SMC_V2) {
1788                 struct smc_llc_msg_delete_rkey_v2 *llcv2;
1789
1790                 memcpy(lgr->wr_rx_buf_v2, llc, sizeof(*llc));
1791                 llcv2 = (struct smc_llc_msg_delete_rkey_v2 *)lgr->wr_rx_buf_v2;
1792                 llcv2->num_inval_rkeys = 0;
1793
1794                 max = min_t(u8, llcv2->num_rkeys, SMC_LLC_RKEYS_PER_MSG_V2);
1795                 for (i = 0; i < max; i++) {
1796                         if (smc_rtoken_delete(link, llcv2->rkey[i]))
1797                                 llcv2->num_inval_rkeys++;
1798                 }
1799                 memset(&llc->rkey[0], 0, sizeof(llc->rkey));
1800                 memset(&llc->reserved2, 0, sizeof(llc->reserved2));
1801                 smc_llc_init_msg_hdr(&llc->hd, link->lgr, sizeof(*llc));
1802                 if (llcv2->num_inval_rkeys) {
1803                         llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
1804                         llc->err_mask = llcv2->num_inval_rkeys;
1805                 }
1806                 goto finish;
1807         }
1808
1809         max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
1810         for (i = 0; i < max; i++) {
1811                 if (smc_rtoken_delete(link, llc->rkey[i]))
1812                         err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i);
1813         }
1814         if (err_mask) {
1815                 llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
1816                 llc->err_mask = err_mask;
1817         }
1818 finish:
1819         llc->hd.flags |= SMC_LLC_FLAG_RESP;
1820         smc_llc_send_message(link, &qentry->msg);
1821         smc_llc_flow_qentry_del(&lgr->llc_flow_rmt);
1822 }
1823
1824 static void smc_llc_protocol_violation(struct smc_link_group *lgr, u8 type)
1825 {
1826         pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu LLC protocol violation: "
1827                             "llc_type %d\n", SMC_LGR_ID_SIZE, &lgr->id,
1828                             lgr->net->net_cookie, type);
1829         smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_PROT_VIOL);
1830         smc_lgr_terminate_sched(lgr);
1831 }
1832
1833 /* flush the llc event queue */
1834 static void smc_llc_event_flush(struct smc_link_group *lgr)
1835 {
1836         struct smc_llc_qentry *qentry, *q;
1837
1838         spin_lock_bh(&lgr->llc_event_q_lock);
1839         list_for_each_entry_safe(qentry, q, &lgr->llc_event_q, list) {
1840                 list_del_init(&qentry->list);
1841                 kfree(qentry);
1842         }
1843         spin_unlock_bh(&lgr->llc_event_q_lock);
1844 }
1845
1846 static void smc_llc_event_handler(struct smc_llc_qentry *qentry)
1847 {
1848         union smc_llc_msg *llc = &qentry->msg;
1849         struct smc_link *link = qentry->link;
1850         struct smc_link_group *lgr = link->lgr;
1851
1852         if (!smc_link_usable(link))
1853                 goto out;
1854
1855         switch (llc->raw.hdr.common.llc_type) {
1856         case SMC_LLC_TEST_LINK:
1857                 llc->test_link.hd.flags |= SMC_LLC_FLAG_RESP;
1858                 smc_llc_send_message(link, llc);
1859                 break;
1860         case SMC_LLC_ADD_LINK:
1861                 if (list_empty(&lgr->list))
1862                         goto out;       /* lgr is terminating */
1863                 if (lgr->role == SMC_CLNT) {
1864                         if (smc_llc_is_local_add_link(llc)) {
1865                                 if (lgr->llc_flow_lcl.type ==
1866                                     SMC_LLC_FLOW_ADD_LINK)
1867                                         break;  /* add_link in progress */
1868                                 if (smc_llc_flow_start(&lgr->llc_flow_lcl,
1869                                                        qentry)) {
1870                                         schedule_work(&lgr->llc_add_link_work);
1871                                 }
1872                                 return;
1873                         }
1874                         if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK &&
1875                             !lgr->llc_flow_lcl.qentry) {
1876                                 /* a flow is waiting for this message */
1877                                 smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
1878                                                         qentry);
1879                                 wake_up(&lgr->llc_msg_waiter);
1880                                 return;
1881                         }
1882                         if (lgr->llc_flow_lcl.type ==
1883                                         SMC_LLC_FLOW_REQ_ADD_LINK) {
1884                                 /* server started add_link processing */
1885                                 lgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK;
1886                                 smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
1887                                                         qentry);
1888                                 schedule_work(&lgr->llc_add_link_work);
1889                                 return;
1890                         }
1891                         if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) {
1892                                 schedule_work(&lgr->llc_add_link_work);
1893                         }
1894                 } else if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) {
1895                         /* as smc server, handle client suggestion */
1896                         schedule_work(&lgr->llc_add_link_work);
1897                 }
1898                 return;
1899         case SMC_LLC_CONFIRM_LINK:
1900         case SMC_LLC_ADD_LINK_CONT:
1901                 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1902                         /* a flow is waiting for this message */
1903                         smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry);
1904                         wake_up(&lgr->llc_msg_waiter);
1905                         return;
1906                 }
1907                 break;
1908         case SMC_LLC_DELETE_LINK:
1909                 if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK &&
1910                     !lgr->llc_flow_lcl.qentry) {
1911                         /* DEL LINK REQ during ADD LINK SEQ */
1912                         smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry);
1913                         wake_up(&lgr->llc_msg_waiter);
1914                 } else if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) {
1915                         schedule_work(&lgr->llc_del_link_work);
1916                 }
1917                 return;
1918         case SMC_LLC_CONFIRM_RKEY:
1919                 /* new request from remote, assign to remote flow */
1920                 if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) {
1921                         /* process here, does not wait for more llc msgs */
1922                         smc_llc_rmt_conf_rkey(lgr);
1923                         smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt);
1924                 }
1925                 return;
1926         case SMC_LLC_CONFIRM_RKEY_CONT:
1927                 /* not used because max links is 3, and 3 rkeys fit into
1928                  * one CONFIRM_RKEY message
1929                  */
1930                 break;
1931         case SMC_LLC_DELETE_RKEY:
1932                 /* new request from remote, assign to remote flow */
1933                 if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) {
1934                         /* process here, does not wait for more llc msgs */
1935                         smc_llc_rmt_delete_rkey(lgr);
1936                         smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt);
1937                 }
1938                 return;
1939         case SMC_LLC_REQ_ADD_LINK:
1940                 /* handle response here, smc_llc_flow_stop() cannot be called
1941                  * in tasklet context
1942                  */
1943                 if (lgr->role == SMC_CLNT &&
1944                     lgr->llc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK &&
1945                     (llc->raw.hdr.flags & SMC_LLC_FLAG_RESP)) {
1946                         smc_llc_flow_stop(link->lgr, &lgr->llc_flow_lcl);
1947                 } else if (lgr->role == SMC_SERV) {
1948                         if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) {
1949                                 /* as smc server, handle client suggestion */
1950                                 lgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK;
1951                                 schedule_work(&lgr->llc_add_link_work);
1952                         }
1953                         return;
1954                 }
1955                 break;
1956         default:
1957                 smc_llc_protocol_violation(lgr, llc->raw.hdr.common.type);
1958                 break;
1959         }
1960 out:
1961         kfree(qentry);
1962 }
1963
1964 /* worker to process llc messages on the event queue */
1965 static void smc_llc_event_work(struct work_struct *work)
1966 {
1967         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
1968                                                   llc_event_work);
1969         struct smc_llc_qentry *qentry;
1970
1971         if (!lgr->llc_flow_lcl.type && lgr->delayed_event) {
1972                 qentry = lgr->delayed_event;
1973                 lgr->delayed_event = NULL;
1974                 if (smc_link_usable(qentry->link))
1975                         smc_llc_event_handler(qentry);
1976                 else
1977                         kfree(qentry);
1978         }
1979
1980 again:
1981         spin_lock_bh(&lgr->llc_event_q_lock);
1982         if (!list_empty(&lgr->llc_event_q)) {
1983                 qentry = list_first_entry(&lgr->llc_event_q,
1984                                           struct smc_llc_qentry, list);
1985                 list_del_init(&qentry->list);
1986                 spin_unlock_bh(&lgr->llc_event_q_lock);
1987                 smc_llc_event_handler(qentry);
1988                 goto again;
1989         }
1990         spin_unlock_bh(&lgr->llc_event_q_lock);
1991 }
1992
1993 /* process llc responses in tasklet context */
1994 static void smc_llc_rx_response(struct smc_link *link,
1995                                 struct smc_llc_qentry *qentry)
1996 {
1997         enum smc_llc_flowtype flowtype = link->lgr->llc_flow_lcl.type;
1998         struct smc_llc_flow *flow = &link->lgr->llc_flow_lcl;
1999         u8 llc_type = qentry->msg.raw.hdr.common.llc_type;
2000
2001         switch (llc_type) {
2002         case SMC_LLC_TEST_LINK:
2003                 if (smc_link_active(link))
2004                         complete(&link->llc_testlink_resp);
2005                 break;
2006         case SMC_LLC_ADD_LINK:
2007         case SMC_LLC_ADD_LINK_CONT:
2008         case SMC_LLC_CONFIRM_LINK:
2009                 if (flowtype != SMC_LLC_FLOW_ADD_LINK || flow->qentry)
2010                         break;  /* drop out-of-flow response */
2011                 goto assign;
2012         case SMC_LLC_DELETE_LINK:
2013                 if (flowtype != SMC_LLC_FLOW_DEL_LINK || flow->qentry)
2014                         break;  /* drop out-of-flow response */
2015                 goto assign;
2016         case SMC_LLC_CONFIRM_RKEY:
2017         case SMC_LLC_DELETE_RKEY:
2018                 if (flowtype != SMC_LLC_FLOW_RKEY || flow->qentry)
2019                         break;  /* drop out-of-flow response */
2020                 goto assign;
2021         case SMC_LLC_CONFIRM_RKEY_CONT:
2022                 /* not used because max links is 3 */
2023                 break;
2024         default:
2025                 smc_llc_protocol_violation(link->lgr,
2026                                            qentry->msg.raw.hdr.common.type);
2027                 break;
2028         }
2029         kfree(qentry);
2030         return;
2031 assign:
2032         /* assign responses to the local flow, we requested them */
2033         smc_llc_flow_qentry_set(&link->lgr->llc_flow_lcl, qentry);
2034         wake_up(&link->lgr->llc_msg_waiter);
2035 }
2036
2037 static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc)
2038 {
2039         struct smc_link_group *lgr = link->lgr;
2040         struct smc_llc_qentry *qentry;
2041         unsigned long flags;
2042
2043         qentry = kmalloc(sizeof(*qentry), GFP_ATOMIC);
2044         if (!qentry)
2045                 return;
2046         qentry->link = link;
2047         INIT_LIST_HEAD(&qentry->list);
2048         memcpy(&qentry->msg, llc, sizeof(union smc_llc_msg));
2049
2050         /* process responses immediately */
2051         if ((llc->raw.hdr.flags & SMC_LLC_FLAG_RESP) &&
2052             llc->raw.hdr.common.llc_type != SMC_LLC_REQ_ADD_LINK) {
2053                 smc_llc_rx_response(link, qentry);
2054                 return;
2055         }
2056
2057         /* add requests to event queue */
2058         spin_lock_irqsave(&lgr->llc_event_q_lock, flags);
2059         list_add_tail(&qentry->list, &lgr->llc_event_q);
2060         spin_unlock_irqrestore(&lgr->llc_event_q_lock, flags);
2061         queue_work(system_highpri_wq, &lgr->llc_event_work);
2062 }
2063
2064 /* copy received msg and add it to the event queue */
2065 static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
2066 {
2067         struct smc_link *link = (struct smc_link *)wc->qp->qp_context;
2068         union smc_llc_msg *llc = buf;
2069
2070         if (wc->byte_len < sizeof(*llc))
2071                 return; /* short message */
2072         if (!llc->raw.hdr.common.llc_version) {
2073                 if (llc->raw.hdr.length != sizeof(*llc))
2074                         return; /* invalid message */
2075         } else {
2076                 if (llc->raw.hdr.length_v2 < sizeof(*llc))
2077                         return; /* invalid message */
2078         }
2079
2080         smc_llc_enqueue(link, llc);
2081 }
2082
2083 /***************************** worker, utils *********************************/
2084
2085 static void smc_llc_testlink_work(struct work_struct *work)
2086 {
2087         struct smc_link *link = container_of(to_delayed_work(work),
2088                                              struct smc_link, llc_testlink_wrk);
2089         unsigned long next_interval;
2090         unsigned long expire_time;
2091         u8 user_data[16] = { 0 };
2092         int rc;
2093
2094         if (!smc_link_active(link))
2095                 return;         /* don't reschedule worker */
2096         expire_time = link->wr_rx_tstamp + link->llc_testlink_time;
2097         if (time_is_after_jiffies(expire_time)) {
2098                 next_interval = expire_time - jiffies;
2099                 goto out;
2100         }
2101         reinit_completion(&link->llc_testlink_resp);
2102         smc_llc_send_test_link(link, user_data);
2103         /* receive TEST LINK response over RoCE fabric */
2104         rc = wait_for_completion_interruptible_timeout(&link->llc_testlink_resp,
2105                                                        SMC_LLC_WAIT_TIME);
2106         if (!smc_link_active(link))
2107                 return;         /* link state changed */
2108         if (rc <= 0) {
2109                 smcr_link_down_cond_sched(link);
2110                 return;
2111         }
2112         next_interval = link->llc_testlink_time;
2113 out:
2114         schedule_delayed_work(&link->llc_testlink_wrk, next_interval);
2115 }
2116
2117 void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc)
2118 {
2119         struct net *net = sock_net(smc->clcsock->sk);
2120
2121         INIT_WORK(&lgr->llc_event_work, smc_llc_event_work);
2122         INIT_WORK(&lgr->llc_add_link_work, smc_llc_add_link_work);
2123         INIT_WORK(&lgr->llc_del_link_work, smc_llc_delete_link_work);
2124         INIT_LIST_HEAD(&lgr->llc_event_q);
2125         spin_lock_init(&lgr->llc_event_q_lock);
2126         spin_lock_init(&lgr->llc_flow_lock);
2127         init_waitqueue_head(&lgr->llc_flow_waiter);
2128         init_waitqueue_head(&lgr->llc_msg_waiter);
2129         init_rwsem(&lgr->llc_conf_mutex);
2130         lgr->llc_testlink_time = READ_ONCE(net->smc.sysctl_smcr_testlink_time);
2131 }
2132
2133 /* called after lgr was removed from lgr_list */
2134 void smc_llc_lgr_clear(struct smc_link_group *lgr)
2135 {
2136         smc_llc_event_flush(lgr);
2137         wake_up_all(&lgr->llc_flow_waiter);
2138         wake_up_all(&lgr->llc_msg_waiter);
2139         cancel_work_sync(&lgr->llc_event_work);
2140         cancel_work_sync(&lgr->llc_add_link_work);
2141         cancel_work_sync(&lgr->llc_del_link_work);
2142         if (lgr->delayed_event) {
2143                 kfree(lgr->delayed_event);
2144                 lgr->delayed_event = NULL;
2145         }
2146 }
2147
2148 int smc_llc_link_init(struct smc_link *link)
2149 {
2150         init_completion(&link->llc_testlink_resp);
2151         INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work);
2152         return 0;
2153 }
2154
2155 void smc_llc_link_active(struct smc_link *link)
2156 {
2157         pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu link added: id %*phN, "
2158                             "peerid %*phN, ibdev %s, ibport %d\n",
2159                             SMC_LGR_ID_SIZE, &link->lgr->id,
2160                             link->lgr->net->net_cookie,
2161                             SMC_LGR_ID_SIZE, &link->link_uid,
2162                             SMC_LGR_ID_SIZE, &link->peer_link_uid,
2163                             link->smcibdev->ibdev->name, link->ibport);
2164         link->state = SMC_LNK_ACTIVE;
2165         if (link->lgr->llc_testlink_time) {
2166                 link->llc_testlink_time = link->lgr->llc_testlink_time;
2167                 schedule_delayed_work(&link->llc_testlink_wrk,
2168                                       link->llc_testlink_time);
2169         }
2170 }
2171
2172 /* called in worker context */
2173 void smc_llc_link_clear(struct smc_link *link, bool log)
2174 {
2175         if (log)
2176                 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu link removed: id %*phN"
2177                                     ", peerid %*phN, ibdev %s, ibport %d\n",
2178                                     SMC_LGR_ID_SIZE, &link->lgr->id,
2179                                     link->lgr->net->net_cookie,
2180                                     SMC_LGR_ID_SIZE, &link->link_uid,
2181                                     SMC_LGR_ID_SIZE, &link->peer_link_uid,
2182                                     link->smcibdev->ibdev->name, link->ibport);
2183         complete(&link->llc_testlink_resp);
2184         cancel_delayed_work_sync(&link->llc_testlink_wrk);
2185 }
2186
2187 /* register a new rtoken at the remote peer (for all links) */
2188 int smc_llc_do_confirm_rkey(struct smc_link *send_link,
2189                             struct smc_buf_desc *rmb_desc)
2190 {
2191         struct smc_link_group *lgr = send_link->lgr;
2192         struct smc_llc_qentry *qentry = NULL;
2193         int rc = 0;
2194
2195         rc = smc_llc_send_confirm_rkey(send_link, rmb_desc);
2196         if (rc)
2197                 goto out;
2198         /* receive CONFIRM RKEY response from server over RoCE fabric */
2199         qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME,
2200                               SMC_LLC_CONFIRM_RKEY);
2201         if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG))
2202                 rc = -EFAULT;
2203 out:
2204         if (qentry)
2205                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
2206         return rc;
2207 }
2208
2209 /* unregister an rtoken at the remote peer */
2210 int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
2211                            struct smc_buf_desc *rmb_desc)
2212 {
2213         struct smc_llc_qentry *qentry = NULL;
2214         struct smc_link *send_link;
2215         int rc = 0;
2216
2217         send_link = smc_llc_usable_link(lgr);
2218         if (!send_link)
2219                 return -ENOLINK;
2220
2221         /* protected by llc_flow control */
2222         rc = smc_llc_send_delete_rkey(send_link, rmb_desc);
2223         if (rc)
2224                 goto out;
2225         /* receive DELETE RKEY response from server over RoCE fabric */
2226         qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME,
2227                               SMC_LLC_DELETE_RKEY);
2228         if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG))
2229                 rc = -EFAULT;
2230 out:
2231         if (qentry)
2232                 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
2233         return rc;
2234 }
2235
2236 void smc_llc_link_set_uid(struct smc_link *link)
2237 {
2238         __be32 link_uid;
2239
2240         link_uid = htonl(*((u32 *)link->lgr->id) + link->link_id);
2241         memcpy(link->link_uid, &link_uid, SMC_LGR_ID_SIZE);
2242 }
2243
2244 /* save peers link user id, used for debug purposes */
2245 void smc_llc_save_peer_uid(struct smc_llc_qentry *qentry)
2246 {
2247         memcpy(qentry->link->peer_link_uid, qentry->msg.confirm_link.link_uid,
2248                SMC_LGR_ID_SIZE);
2249 }
2250
2251 /* evaluate confirm link request or response */
2252 int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
2253                            enum smc_llc_reqresp type)
2254 {
2255         if (type == SMC_LLC_REQ) {      /* SMC server assigns link_id */
2256                 qentry->link->link_id = qentry->msg.confirm_link.link_num;
2257                 smc_llc_link_set_uid(qentry->link);
2258         }
2259         if (!(qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_NO_RMBE_EYEC))
2260                 return -ENOTSUPP;
2261         return 0;
2262 }
2263
2264 /***************************** init, exit, misc ******************************/
2265
2266 static struct smc_wr_rx_handler smc_llc_rx_handlers[] = {
2267         {
2268                 .handler        = smc_llc_rx_handler,
2269                 .type           = SMC_LLC_CONFIRM_LINK
2270         },
2271         {
2272                 .handler        = smc_llc_rx_handler,
2273                 .type           = SMC_LLC_TEST_LINK
2274         },
2275         {
2276                 .handler        = smc_llc_rx_handler,
2277                 .type           = SMC_LLC_ADD_LINK
2278         },
2279         {
2280                 .handler        = smc_llc_rx_handler,
2281                 .type           = SMC_LLC_ADD_LINK_CONT
2282         },
2283         {
2284                 .handler        = smc_llc_rx_handler,
2285                 .type           = SMC_LLC_DELETE_LINK
2286         },
2287         {
2288                 .handler        = smc_llc_rx_handler,
2289                 .type           = SMC_LLC_CONFIRM_RKEY
2290         },
2291         {
2292                 .handler        = smc_llc_rx_handler,
2293                 .type           = SMC_LLC_CONFIRM_RKEY_CONT
2294         },
2295         {
2296                 .handler        = smc_llc_rx_handler,
2297                 .type           = SMC_LLC_DELETE_RKEY
2298         },
2299         /* V2 types */
2300         {
2301                 .handler        = smc_llc_rx_handler,
2302                 .type           = SMC_LLC_CONFIRM_LINK_V2
2303         },
2304         {
2305                 .handler        = smc_llc_rx_handler,
2306                 .type           = SMC_LLC_TEST_LINK_V2
2307         },
2308         {
2309                 .handler        = smc_llc_rx_handler,
2310                 .type           = SMC_LLC_ADD_LINK_V2
2311         },
2312         {
2313                 .handler        = smc_llc_rx_handler,
2314                 .type           = SMC_LLC_DELETE_LINK_V2
2315         },
2316         {
2317                 .handler        = smc_llc_rx_handler,
2318                 .type           = SMC_LLC_REQ_ADD_LINK_V2
2319         },
2320         {
2321                 .handler        = smc_llc_rx_handler,
2322                 .type           = SMC_LLC_CONFIRM_RKEY_V2
2323         },
2324         {
2325                 .handler        = smc_llc_rx_handler,
2326                 .type           = SMC_LLC_DELETE_RKEY_V2
2327         },
2328         {
2329                 .handler        = NULL,
2330         }
2331 };
2332
2333 int __init smc_llc_init(void)
2334 {
2335         struct smc_wr_rx_handler *handler;
2336         int rc = 0;
2337
2338         for (handler = smc_llc_rx_handlers; handler->handler; handler++) {
2339                 INIT_HLIST_NODE(&handler->list);
2340                 rc = smc_wr_rx_register_handler(handler);
2341                 if (rc)
2342                         break;
2343         }
2344         return rc;
2345 }