drivers/infiniband/hw/cxgb4/qp.c

   1 /*
   2  * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/module.h>
  34
  35 #include "iw_cxgb4.h"
  36
  37 static int db_delay_usecs = 1;
  38 module_param(db_delay_usecs, int, 0644);
  39 MODULE_PARM_DESC(db_delay_usecs, "Usecs to delay awaiting db fifo to drain");
  40
  41 static int ocqp_support = 1;
  42 module_param(ocqp_support, int, 0644);
  43 MODULE_PARM_DESC(ocqp_support, "Support on-chip SQs (default=1)");
  44
  45 int db_fc_threshold = 1000;
  46 module_param(db_fc_threshold, int, 0644);
  47 MODULE_PARM_DESC(db_fc_threshold,
  48                  "QP count/threshold that triggers"
  49                  " automatic db flow control mode (default = 1000)");
  50
  51 int db_coalescing_threshold;
  52 module_param(db_coalescing_threshold, int, 0644);
  53 MODULE_PARM_DESC(db_coalescing_threshold,
  54                  "QP count/threshold that triggers"
  55                  " disabling db coalescing (default = 0)");
  56
  57 static int max_fr_immd = T4_MAX_FR_IMMD;
  58 module_param(max_fr_immd, int, 0644);
  59 MODULE_PARM_DESC(max_fr_immd, "fastreg threshold for using DSGL instead of immedate");
  60
  61 static int alloc_ird(struct c4iw_dev *dev, u32 ird)
  62 {
  63         int ret = 0;
  64
  65         spin_lock_irq(&dev->lock);
  66         if (ird <= dev->avail_ird)
  67                 dev->avail_ird -= ird;
  68         else
  69                 ret = -ENOMEM;
  70         spin_unlock_irq(&dev->lock);
  71
  72         if (ret)
  73                 dev_warn(&dev->rdev.lldi.pdev->dev,
  74                          "device IRD resources exhausted\n");
  75
  76         return ret;
  77 }
  78
  79 static void free_ird(struct c4iw_dev *dev, int ird)
  80 {
  81         spin_lock_irq(&dev->lock);
  82         dev->avail_ird += ird;
  83         spin_unlock_irq(&dev->lock);
  84 }
  85
  86 static void set_state(struct c4iw_qp *qhp, enum c4iw_qp_state state)
  87 {
  88         unsigned long flag;
  89         spin_lock_irqsave(&qhp->lock, flag);
  90         qhp->attr.state = state;
  91         spin_unlock_irqrestore(&qhp->lock, flag);
  92 }
  93
  94 static void dealloc_oc_sq(struct c4iw_rdev *rdev, struct t4_sq *sq)
  95 {
  96         c4iw_ocqp_pool_free(rdev, sq->dma_addr, sq->memsize);
  97 }
  98
  99 static void dealloc_host_sq(struct c4iw_rdev *rdev, struct t4_sq *sq)
 100 {
 101         dma_free_coherent(&(rdev->lldi.pdev->dev), sq->memsize, sq->queue,
 102                           pci_unmap_addr(sq, mapping));
 103 }
 104
 105 static void dealloc_sq(struct c4iw_rdev *rdev, struct t4_sq *sq)
 106 {
 107         if (t4_sq_onchip(sq))
 108                 dealloc_oc_sq(rdev, sq);
 109         else
 110                 dealloc_host_sq(rdev, sq);
 111 }
 112
 113 static int alloc_oc_sq(struct c4iw_rdev *rdev, struct t4_sq *sq)
 114 {
 115         if (!ocqp_support || !ocqp_supported(&rdev->lldi))
 116                 return -ENOSYS;
 117         sq->dma_addr = c4iw_ocqp_pool_alloc(rdev, sq->memsize);
 118         if (!sq->dma_addr)
 119                 return -ENOMEM;
 120         sq->phys_addr = rdev->oc_mw_pa + sq->dma_addr -
 121                         rdev->lldi.vr->ocq.start;
 122         sq->queue = (__force union t4_wr *)(rdev->oc_mw_kva + sq->dma_addr -
 123                                             rdev->lldi.vr->ocq.start);
 124         sq->flags |= T4_SQ_ONCHIP;
 125         return 0;
 126 }
 127
 128 static int alloc_host_sq(struct c4iw_rdev *rdev, struct t4_sq *sq)
 129 {
 130         sq->queue = dma_alloc_coherent(&(rdev->lldi.pdev->dev), sq->memsize,
 131                                        &(sq->dma_addr), GFP_KERNEL);
 132         if (!sq->queue)
 133                 return -ENOMEM;
 134         sq->phys_addr = virt_to_phys(sq->queue);
 135         pci_unmap_addr_set(sq, mapping, sq->dma_addr);
 136         return 0;
 137 }
 138
 139 static int alloc_sq(struct c4iw_rdev *rdev, struct t4_sq *sq, int user)
 140 {
 141         int ret = -ENOSYS;
 142         if (user)
 143                 ret = alloc_oc_sq(rdev, sq);
 144         if (ret)
 145                 ret = alloc_host_sq(rdev, sq);
 146         return ret;
 147 }
 148
 149 static int destroy_qp(struct c4iw_rdev *rdev, struct t4_wq *wq,
 150                       struct c4iw_dev_ucontext *uctx)
 151 {
 152         /*
 153          * uP clears EQ contexts when the connection exits rdma mode,
 154          * so no need to post a RESET WR for these EQs.
 155          */
 156         dma_free_coherent(&(rdev->lldi.pdev->dev),
 157                           wq->rq.memsize, wq->rq.queue,
 158                           dma_unmap_addr(&wq->rq, mapping));
 159         dealloc_sq(rdev, &wq->sq);
 160         c4iw_rqtpool_free(rdev, wq->rq.rqt_hwaddr, wq->rq.rqt_size);
 161         kfree(wq->rq.sw_rq);
 162         kfree(wq->sq.sw_sq);
 163         c4iw_put_qpid(rdev, wq->rq.qid, uctx);
 164         c4iw_put_qpid(rdev, wq->sq.qid, uctx);
 165         return 0;
 166 }
 167
 168 /*
 169  * Determine the BAR2 virtual address and qid. If pbar2_pa is not NULL,
 170  * then this is a user mapping so compute the page-aligned physical address
 171  * for mapping.
 172  */
 173 void __iomem *c4iw_bar2_addrs(struct c4iw_rdev *rdev, unsigned int qid,
 174                               enum cxgb4_bar2_qtype qtype,
 175                               unsigned int *pbar2_qid, u64 *pbar2_pa)
 176 {
 177         u64 bar2_qoffset;
 178         int ret;
 179
 180         ret = cxgb4_bar2_sge_qregs(rdev->lldi.ports[0], qid, qtype,
 181                                    pbar2_pa ? 1 : 0,
 182                                    &bar2_qoffset, pbar2_qid);
 183         if (ret)
 184                 return NULL;
 185
 186         if (pbar2_pa)
 187                 *pbar2_pa = (rdev->bar2_pa + bar2_qoffset) & PAGE_MASK;
 188
 189         if (is_t4(rdev->lldi.adapter_type))
 190                 return NULL;
 191
 192         return rdev->bar2_kva + bar2_qoffset;
 193 }
 194
 195 static int create_qp(struct c4iw_rdev *rdev, struct t4_wq *wq,
 196                      struct t4_cq *rcq, struct t4_cq *scq,
 197                      struct c4iw_dev_ucontext *uctx,
 198                      struct c4iw_wr_wait *wr_waitp)
 199 {
 200         int user = (uctx != &rdev->uctx);
 201         struct fw_ri_res_wr *res_wr;
 202         struct fw_ri_res *res;
 203         int wr_len;
 204         struct sk_buff *skb;
 205         int ret = 0;
 206         int eqsize;
 207
 208         wq->sq.qid = c4iw_get_qpid(rdev, uctx);
 209         if (!wq->sq.qid)
 210                 return -ENOMEM;
 211
 212         wq->rq.qid = c4iw_get_qpid(rdev, uctx);
 213         if (!wq->rq.qid) {
 214                 ret = -ENOMEM;
 215                 goto free_sq_qid;
 216         }
 217
 218         if (!user) {
 219                 wq->sq.sw_sq = kzalloc(wq->sq.size * sizeof *wq->sq.sw_sq,
 220                                  GFP_KERNEL);
 221                 if (!wq->sq.sw_sq) {
 222                         ret = -ENOMEM;
 223                         goto free_rq_qid;
 224                 }
 225
 226                 wq->rq.sw_rq = kzalloc(wq->rq.size * sizeof *wq->rq.sw_rq,
 227                                  GFP_KERNEL);
 228                 if (!wq->rq.sw_rq) {
 229                         ret = -ENOMEM;
 230                         goto free_sw_sq;
 231                 }
 232         }
 233
 234         /*
 235          * RQT must be a power of 2 and at least 16 deep.
 236          */
 237         wq->rq.rqt_size = roundup_pow_of_two(max_t(u16, wq->rq.size, 16));
 238         wq->rq.rqt_hwaddr = c4iw_rqtpool_alloc(rdev, wq->rq.rqt_size);
 239         if (!wq->rq.rqt_hwaddr) {
 240                 ret = -ENOMEM;
 241                 goto free_sw_rq;
 242         }
 243
 244         ret = alloc_sq(rdev, &wq->sq, user);
 245         if (ret)
 246                 goto free_hwaddr;
 247         memset(wq->sq.queue, 0, wq->sq.memsize);
 248         dma_unmap_addr_set(&wq->sq, mapping, wq->sq.dma_addr);
 249
 250         wq->rq.queue = dma_alloc_coherent(&(rdev->lldi.pdev->dev),
 251                                           wq->rq.memsize, &(wq->rq.dma_addr),
 252                                           GFP_KERNEL);
 253         if (!wq->rq.queue) {
 254                 ret = -ENOMEM;
 255                 goto free_sq;
 256         }
 257         pr_debug("sq base va 0x%p pa 0x%llx rq base va 0x%p pa 0x%llx\n",
 258                  wq->sq.queue,
 259                  (unsigned long long)virt_to_phys(wq->sq.queue),
 260                  wq->rq.queue,
 261                  (unsigned long long)virt_to_phys(wq->rq.queue));
 262         memset(wq->rq.queue, 0, wq->rq.memsize);
 263         dma_unmap_addr_set(&wq->rq, mapping, wq->rq.dma_addr);
 264
 265         wq->db = rdev->lldi.db_reg;
 266
 267         wq->sq.bar2_va = c4iw_bar2_addrs(rdev, wq->sq.qid, T4_BAR2_QTYPE_EGRESS,
 268                                          &wq->sq.bar2_qid,
 269                                          user ? &wq->sq.bar2_pa : NULL);
 270         wq->rq.bar2_va = c4iw_bar2_addrs(rdev, wq->rq.qid, T4_BAR2_QTYPE_EGRESS,
 271                                          &wq->rq.bar2_qid,
 272                                          user ? &wq->rq.bar2_pa : NULL);
 273
 274         /*
 275          * User mode must have bar2 access.
 276          */
 277         if (user && (!wq->sq.bar2_pa || !wq->rq.bar2_pa)) {
 278                 pr_warn("%s: sqid %u or rqid %u not in BAR2 range\n",
 279                         pci_name(rdev->lldi.pdev), wq->sq.qid, wq->rq.qid);
 280                 goto free_dma;
 281         }
 282
 283         wq->rdev = rdev;
 284         wq->rq.msn = 1;
 285
 286         /* build fw_ri_res_wr */
 287         wr_len = sizeof *res_wr + 2 * sizeof *res;
 288
 289         skb = alloc_skb(wr_len, GFP_KERNEL);
 290         if (!skb) {
 291                 ret = -ENOMEM;
 292                 goto free_dma;
 293         }
 294         set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0);
 295
 296         res_wr = __skb_put_zero(skb, wr_len);
 297         res_wr->op_nres = cpu_to_be32(
 298                         FW_WR_OP_V(FW_RI_RES_WR) |
 299                         FW_RI_RES_WR_NRES_V(2) |
 300                         FW_WR_COMPL_F);
 301         res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16));
 302         res_wr->cookie = (uintptr_t)wr_waitp;
 303         res = res_wr->res;
 304         res->u.sqrq.restype = FW_RI_RES_TYPE_SQ;
 305         res->u.sqrq.op = FW_RI_RES_OP_WRITE;
 306
 307         /*
 308          * eqsize is the number of 64B entries plus the status page size.
 309          */
 310         eqsize = wq->sq.size * T4_SQ_NUM_SLOTS +
 311                 rdev->hw_queue.t4_eq_status_entries;
 312
 313         res->u.sqrq.fetchszm_to_iqid = cpu_to_be32(
 314                 FW_RI_RES_WR_HOSTFCMODE_V(0) |  /* no host cidx updates */
 315                 FW_RI_RES_WR_CPRIO_V(0) |       /* don't keep in chip cache */
 316                 FW_RI_RES_WR_PCIECHN_V(0) |     /* set by uP at ri_init time */
 317                 (t4_sq_onchip(&wq->sq) ? FW_RI_RES_WR_ONCHIP_F : 0) |
 318                 FW_RI_RES_WR_IQID_V(scq->cqid));
 319         res->u.sqrq.dcaen_to_eqsize = cpu_to_be32(
 320                 FW_RI_RES_WR_DCAEN_V(0) |
 321                 FW_RI_RES_WR_DCACPU_V(0) |
 322                 FW_RI_RES_WR_FBMIN_V(2) |
 323                 (t4_sq_onchip(&wq->sq) ? FW_RI_RES_WR_FBMAX_V(2) :
 324                                          FW_RI_RES_WR_FBMAX_V(3)) |
 325                 FW_RI_RES_WR_CIDXFTHRESHO_V(0) |
 326                 FW_RI_RES_WR_CIDXFTHRESH_V(0) |
 327                 FW_RI_RES_WR_EQSIZE_V(eqsize));
 328         res->u.sqrq.eqid = cpu_to_be32(wq->sq.qid);
 329         res->u.sqrq.eqaddr = cpu_to_be64(wq->sq.dma_addr);
 330         res++;
 331         res->u.sqrq.restype = FW_RI_RES_TYPE_RQ;
 332         res->u.sqrq.op = FW_RI_RES_OP_WRITE;
 333
 334         /*
 335          * eqsize is the number of 64B entries plus the status page size.
 336          */
 337         eqsize = wq->rq.size * T4_RQ_NUM_SLOTS +
 338                 rdev->hw_queue.t4_eq_status_entries;
 339         res->u.sqrq.fetchszm_to_iqid = cpu_to_be32(
 340                 FW_RI_RES_WR_HOSTFCMODE_V(0) |  /* no host cidx updates */
 341                 FW_RI_RES_WR_CPRIO_V(0) |       /* don't keep in chip cache */
 342                 FW_RI_RES_WR_PCIECHN_V(0) |     /* set by uP at ri_init time */
 343                 FW_RI_RES_WR_IQID_V(rcq->cqid));
 344         res->u.sqrq.dcaen_to_eqsize = cpu_to_be32(
 345                 FW_RI_RES_WR_DCAEN_V(0) |
 346                 FW_RI_RES_WR_DCACPU_V(0) |
 347                 FW_RI_RES_WR_FBMIN_V(2) |
 348                 FW_RI_RES_WR_FBMAX_V(3) |
 349                 FW_RI_RES_WR_CIDXFTHRESHO_V(0) |
 350                 FW_RI_RES_WR_CIDXFTHRESH_V(0) |
 351                 FW_RI_RES_WR_EQSIZE_V(eqsize));
 352         res->u.sqrq.eqid = cpu_to_be32(wq->rq.qid);
 353         res->u.sqrq.eqaddr = cpu_to_be64(wq->rq.dma_addr);
 354
 355         c4iw_init_wr_wait(wr_waitp);
 356         ret = c4iw_ref_send_wait(rdev, skb, wr_waitp, 0, wq->sq.qid, __func__);
 357         if (ret)
 358                 goto free_dma;
 359
 360         pr_debug("sqid 0x%x rqid 0x%x kdb 0x%p sq_bar2_addr %p rq_bar2_addr %p\n",
 361                  wq->sq.qid, wq->rq.qid, wq->db,
 362                  wq->sq.bar2_va, wq->rq.bar2_va);
 363
 364         return 0;
 365 free_dma:
 366         dma_free_coherent(&(rdev->lldi.pdev->dev),
 367                           wq->rq.memsize, wq->rq.queue,
 368                           dma_unmap_addr(&wq->rq, mapping));
 369 free_sq:
 370         dealloc_sq(rdev, &wq->sq);
 371 free_hwaddr:
 372         c4iw_rqtpool_free(rdev, wq->rq.rqt_hwaddr, wq->rq.rqt_size);
 373 free_sw_rq:
 374         kfree(wq->rq.sw_rq);
 375 free_sw_sq:
 376         kfree(wq->sq.sw_sq);
 377 free_rq_qid:
 378         c4iw_put_qpid(rdev, wq->rq.qid, uctx);
 379 free_sq_qid:
 380         c4iw_put_qpid(rdev, wq->sq.qid, uctx);
 381         return ret;
 382 }
 383
 384 static int build_immd(struct t4_sq *sq, struct fw_ri_immd *immdp,
 385                       struct ib_send_wr *wr, int max, u32 *plenp)
 386 {
 387         u8 *dstp, *srcp;
 388         u32 plen = 0;
 389         int i;
 390         int rem, len;
 391
 392         dstp = (u8 *)immdp->data;
 393         for (i = 0; i < wr->num_sge; i++) {
 394                 if ((plen + wr->sg_list[i].length) > max)
 395                         return -EMSGSIZE;
 396                 srcp = (u8 *)(unsigned long)wr->sg_list[i].addr;
 397                 plen += wr->sg_list[i].length;
 398                 rem = wr->sg_list[i].length;
 399                 while (rem) {
 400                         if (dstp == (u8 *)&sq->queue[sq->size])
 401                                 dstp = (u8 *)sq->queue;
 402                         if (rem <= (u8 *)&sq->queue[sq->size] - dstp)
 403                                 len = rem;
 404                         else
 405                                 len = (u8 *)&sq->queue[sq->size] - dstp;
 406                         memcpy(dstp, srcp, len);
 407                         dstp += len;
 408                         srcp += len;
 409                         rem -= len;
 410                 }
 411         }
 412         len = roundup(plen + sizeof *immdp, 16) - (plen + sizeof *immdp);
 413         if (len)
 414                 memset(dstp, 0, len);
 415         immdp->op = FW_RI_DATA_IMMD;
 416         immdp->r1 = 0;
 417         immdp->r2 = 0;
 418         immdp->immdlen = cpu_to_be32(plen);
 419         *plenp = plen;
 420         return 0;
 421 }
 422
 423 static int build_isgl(__be64 *queue_start, __be64 *queue_end,
 424                       struct fw_ri_isgl *isglp, struct ib_sge *sg_list,
 425                       int num_sge, u32 *plenp)
 426
 427 {
 428         int i;
 429         u32 plen = 0;
 430         __be64 *flitp = (__be64 *)isglp->sge;
 431
 432         for (i = 0; i < num_sge; i++) {
 433                 if ((plen + sg_list[i].length) < plen)
 434                         return -EMSGSIZE;
 435                 plen += sg_list[i].length;
 436                 *flitp = cpu_to_be64(((u64)sg_list[i].lkey << 32) |
 437                                      sg_list[i].length);
 438                 if (++flitp == queue_end)
 439                         flitp = queue_start;
 440                 *flitp = cpu_to_be64(sg_list[i].addr);
 441                 if (++flitp == queue_end)
 442                         flitp = queue_start;
 443         }
 444         *flitp = (__force __be64)0;
 445         isglp->op = FW_RI_DATA_ISGL;
 446         isglp->r1 = 0;
 447         isglp->nsge = cpu_to_be16(num_sge);
 448         isglp->r2 = 0;
 449         if (plenp)
 450                 *plenp = plen;
 451         return 0;
 452 }
 453
 454 static int build_rdma_send(struct t4_sq *sq, union t4_wr *wqe,
 455                            struct ib_send_wr *wr, u8 *len16)
 456 {
 457         u32 plen;
 458         int size;
 459         int ret;
 460
 461         if (wr->num_sge > T4_MAX_SEND_SGE)
 462                 return -EINVAL;
 463         switch (wr->opcode) {
 464         case IB_WR_SEND:
 465                 if (wr->send_flags & IB_SEND_SOLICITED)
 466                         wqe->send.sendop_pkd = cpu_to_be32(
 467                                 FW_RI_SEND_WR_SENDOP_V(FW_RI_SEND_WITH_SE));
 468                 else
 469                         wqe->send.sendop_pkd = cpu_to_be32(
 470                                 FW_RI_SEND_WR_SENDOP_V(FW_RI_SEND));
 471                 wqe->send.stag_inv = 0;
 472                 break;
 473         case IB_WR_SEND_WITH_INV:
 474                 if (wr->send_flags & IB_SEND_SOLICITED)
 475                         wqe->send.sendop_pkd = cpu_to_be32(
 476                                 FW_RI_SEND_WR_SENDOP_V(FW_RI_SEND_WITH_SE_INV));
 477                 else
 478                         wqe->send.sendop_pkd = cpu_to_be32(
 479                                 FW_RI_SEND_WR_SENDOP_V(FW_RI_SEND_WITH_INV));
 480                 wqe->send.stag_inv = cpu_to_be32(wr->ex.invalidate_rkey);
 481                 break;
 482
 483         default:
 484                 return -EINVAL;
 485         }
 486         wqe->send.r3 = 0;
 487         wqe->send.r4 = 0;
 488
 489         plen = 0;
 490         if (wr->num_sge) {
 491                 if (wr->send_flags & IB_SEND_INLINE) {
 492                         ret = build_immd(sq, wqe->send.u.immd_src, wr,
 493                                          T4_MAX_SEND_INLINE, &plen);
 494                         if (ret)
 495                                 return ret;
 496                         size = sizeof wqe->send + sizeof(struct fw_ri_immd) +
 497                                plen;
 498                 } else {
 499                         ret = build_isgl((__be64 *)sq->queue,
 500                                          (__be64 *)&sq->queue[sq->size],
 501                                          wqe->send.u.isgl_src,
 502                                          wr->sg_list, wr->num_sge, &plen);
 503                         if (ret)
 504                                 return ret;
 505                         size = sizeof wqe->send + sizeof(struct fw_ri_isgl) +
 506                                wr->num_sge * sizeof(struct fw_ri_sge);
 507                 }
 508         } else {
 509                 wqe->send.u.immd_src[0].op = FW_RI_DATA_IMMD;
 510                 wqe->send.u.immd_src[0].r1 = 0;
 511                 wqe->send.u.immd_src[0].r2 = 0;
 512                 wqe->send.u.immd_src[0].immdlen = 0;
 513                 size = sizeof wqe->send + sizeof(struct fw_ri_immd);
 514                 plen = 0;
 515         }
 516         *len16 = DIV_ROUND_UP(size, 16);
 517         wqe->send.plen = cpu_to_be32(plen);
 518         return 0;
 519 }
 520
 521 static int build_rdma_write(struct t4_sq *sq, union t4_wr *wqe,
 522                             struct ib_send_wr *wr, u8 *len16)
 523 {
 524         u32 plen;
 525         int size;
 526         int ret;
 527
 528         if (wr->num_sge > T4_MAX_SEND_SGE)
 529                 return -EINVAL;
 530         wqe->write.r2 = 0;
 531         wqe->write.stag_sink = cpu_to_be32(rdma_wr(wr)->rkey);
 532         wqe->write.to_sink = cpu_to_be64(rdma_wr(wr)->remote_addr);
 533         if (wr->num_sge) {
 534                 if (wr->send_flags & IB_SEND_INLINE) {
 535                         ret = build_immd(sq, wqe->write.u.immd_src, wr,
 536                                          T4_MAX_WRITE_INLINE, &plen);
 537                         if (ret)
 538                                 return ret;
 539                         size = sizeof wqe->write + sizeof(struct fw_ri_immd) +
 540                                plen;
 541                 } else {
 542                         ret = build_isgl((__be64 *)sq->queue,
 543                                          (__be64 *)&sq->queue[sq->size],
 544                                          wqe->write.u.isgl_src,
 545                                          wr->sg_list, wr->num_sge, &plen);
 546                         if (ret)
 547                                 return ret;
 548                         size = sizeof wqe->write + sizeof(struct fw_ri_isgl) +
 549                                wr->num_sge * sizeof(struct fw_ri_sge);
 550                 }
 551         } else {
 552                 wqe->write.u.immd_src[0].op = FW_RI_DATA_IMMD;
 553                 wqe->write.u.immd_src[0].r1 = 0;
 554                 wqe->write.u.immd_src[0].r2 = 0;
 555                 wqe->write.u.immd_src[0].immdlen = 0;
 556                 size = sizeof wqe->write + sizeof(struct fw_ri_immd);
 557                 plen = 0;
 558         }
 559         *len16 = DIV_ROUND_UP(size, 16);
 560         wqe->write.plen = cpu_to_be32(plen);
 561         return 0;
 562 }
 563
 564 static int build_rdma_read(union t4_wr *wqe, struct ib_send_wr *wr, u8 *len16)
 565 {
 566         if (wr->num_sge > 1)
 567                 return -EINVAL;
 568         if (wr->num_sge && wr->sg_list[0].length) {
 569                 wqe->read.stag_src = cpu_to_be32(rdma_wr(wr)->rkey);
 570                 wqe->read.to_src_hi = cpu_to_be32((u32)(rdma_wr(wr)->remote_addr
 571                                                         >> 32));
 572                 wqe->read.to_src_lo = cpu_to_be32((u32)rdma_wr(wr)->remote_addr);
 573                 wqe->read.stag_sink = cpu_to_be32(wr->sg_list[0].lkey);
 574                 wqe->read.plen = cpu_to_be32(wr->sg_list[0].length);
 575                 wqe->read.to_sink_hi = cpu_to_be32((u32)(wr->sg_list[0].addr
 576                                                          >> 32));
 577                 wqe->read.to_sink_lo = cpu_to_be32((u32)(wr->sg_list[0].addr));
 578         } else {
 579                 wqe->read.stag_src = cpu_to_be32(2);
 580                 wqe->read.to_src_hi = 0;
 581                 wqe->read.to_src_lo = 0;
 582                 wqe->read.stag_sink = cpu_to_be32(2);
 583                 wqe->read.plen = 0;
 584                 wqe->read.to_sink_hi = 0;
 585                 wqe->read.to_sink_lo = 0;
 586         }
 587         wqe->read.r2 = 0;
 588         wqe->read.r5 = 0;
 589         *len16 = DIV_ROUND_UP(sizeof wqe->read, 16);
 590         return 0;
 591 }
 592
 593 static int build_rdma_recv(struct c4iw_qp *qhp, union t4_recv_wr *wqe,
 594                            struct ib_recv_wr *wr, u8 *len16)
 595 {
 596         int ret;
 597
 598         ret = build_isgl((__be64 *)qhp->wq.rq.queue,
 599                          (__be64 *)&qhp->wq.rq.queue[qhp->wq.rq.size],
 600                          &wqe->recv.isgl, wr->sg_list, wr->num_sge, NULL);
 601         if (ret)
 602                 return ret;
 603         *len16 = DIV_ROUND_UP(sizeof wqe->recv +
 604                               wr->num_sge * sizeof(struct fw_ri_sge), 16);
 605         return 0;
 606 }
 607
 608 static void build_tpte_memreg(struct fw_ri_fr_nsmr_tpte_wr *fr,
 609                               struct ib_reg_wr *wr, struct c4iw_mr *mhp,
 610                               u8 *len16)
 611 {
 612         __be64 *p = (__be64 *)fr->pbl;
 613
 614         fr->r2 = cpu_to_be32(0);
 615         fr->stag = cpu_to_be32(mhp->ibmr.rkey);
 616
 617         fr->tpte.valid_to_pdid = cpu_to_be32(FW_RI_TPTE_VALID_F |
 618                 FW_RI_TPTE_STAGKEY_V((mhp->ibmr.rkey & FW_RI_TPTE_STAGKEY_M)) |
 619                 FW_RI_TPTE_STAGSTATE_V(1) |
 620                 FW_RI_TPTE_STAGTYPE_V(FW_RI_STAG_NSMR) |
 621                 FW_RI_TPTE_PDID_V(mhp->attr.pdid));
 622         fr->tpte.locread_to_qpid = cpu_to_be32(
 623                 FW_RI_TPTE_PERM_V(c4iw_ib_to_tpt_access(wr->access)) |
 624                 FW_RI_TPTE_ADDRTYPE_V(FW_RI_VA_BASED_TO) |
 625                 FW_RI_TPTE_PS_V(ilog2(wr->mr->page_size) - 12));
 626         fr->tpte.nosnoop_pbladdr = cpu_to_be32(FW_RI_TPTE_PBLADDR_V(
 627                 PBL_OFF(&mhp->rhp->rdev, mhp->attr.pbl_addr)>>3));
 628         fr->tpte.dca_mwbcnt_pstag = cpu_to_be32(0);
 629         fr->tpte.len_hi = cpu_to_be32(0);
 630         fr->tpte.len_lo = cpu_to_be32(mhp->ibmr.length);
 631         fr->tpte.va_hi = cpu_to_be32(mhp->ibmr.iova >> 32);
 632         fr->tpte.va_lo_fbo = cpu_to_be32(mhp->ibmr.iova & 0xffffffff);
 633
 634         p[0] = cpu_to_be64((u64)mhp->mpl[0]);
 635         p[1] = cpu_to_be64((u64)mhp->mpl[1]);
 636
 637         *len16 = DIV_ROUND_UP(sizeof(*fr), 16);
 638 }
 639
 640 static int build_memreg(struct t4_sq *sq, union t4_wr *wqe,
 641                         struct ib_reg_wr *wr, struct c4iw_mr *mhp, u8 *len16,
 642                         bool dsgl_supported)
 643 {
 644         struct fw_ri_immd *imdp;
 645         __be64 *p;
 646         int i;
 647         int pbllen = roundup(mhp->mpl_len * sizeof(u64), 32);
 648         int rem;
 649
 650         if (mhp->mpl_len > t4_max_fr_depth(dsgl_supported && use_dsgl))
 651                 return -EINVAL;
 652
 653         wqe->fr.qpbinde_to_dcacpu = 0;
 654         wqe->fr.pgsz_shift = ilog2(wr->mr->page_size) - 12;
 655         wqe->fr.addr_type = FW_RI_VA_BASED_TO;
 656         wqe->fr.mem_perms = c4iw_ib_to_tpt_access(wr->access);
 657         wqe->fr.len_hi = 0;
 658         wqe->fr.len_lo = cpu_to_be32(mhp->ibmr.length);
 659         wqe->fr.stag = cpu_to_be32(wr->key);
 660         wqe->fr.va_hi = cpu_to_be32(mhp->ibmr.iova >> 32);
 661         wqe->fr.va_lo_fbo = cpu_to_be32(mhp->ibmr.iova &
 662                                         0xffffffff);
 663
 664         if (dsgl_supported && use_dsgl && (pbllen > max_fr_immd)) {
 665                 struct fw_ri_dsgl *sglp;
 666
 667                 for (i = 0; i < mhp->mpl_len; i++)
 668                         mhp->mpl[i] = (__force u64)cpu_to_be64((u64)mhp->mpl[i]);
 669
 670                 sglp = (struct fw_ri_dsgl *)(&wqe->fr + 1);
 671                 sglp->op = FW_RI_DATA_DSGL;
 672                 sglp->r1 = 0;
 673                 sglp->nsge = cpu_to_be16(1);
 674                 sglp->addr0 = cpu_to_be64(mhp->mpl_addr);
 675                 sglp->len0 = cpu_to_be32(pbllen);
 676
 677                 *len16 = DIV_ROUND_UP(sizeof(wqe->fr) + sizeof(*sglp), 16);
 678         } else {
 679                 imdp = (struct fw_ri_immd *)(&wqe->fr + 1);
 680                 imdp->op = FW_RI_DATA_IMMD;
 681                 imdp->r1 = 0;
 682                 imdp->r2 = 0;
 683                 imdp->immdlen = cpu_to_be32(pbllen);
 684                 p = (__be64 *)(imdp + 1);
 685                 rem = pbllen;
 686                 for (i = 0; i < mhp->mpl_len; i++) {
 687                         *p = cpu_to_be64((u64)mhp->mpl[i]);
 688                         rem -= sizeof(*p);
 689                         if (++p == (__be64 *)&sq->queue[sq->size])
 690                                 p = (__be64 *)sq->queue;
 691                 }
 692                 while (rem) {
 693                         *p = 0;
 694                         rem -= sizeof(*p);
 695                         if (++p == (__be64 *)&sq->queue[sq->size])
 696                                 p = (__be64 *)sq->queue;
 697                 }
 698                 *len16 = DIV_ROUND_UP(sizeof(wqe->fr) + sizeof(*imdp)
 699                                       + pbllen, 16);
 700         }
 701         return 0;
 702 }
 703
 704 static int build_inv_stag(union t4_wr *wqe, struct ib_send_wr *wr, u8 *len16)
 705 {
 706         wqe->inv.stag_inv = cpu_to_be32(wr->ex.invalidate_rkey);
 707         wqe->inv.r2 = 0;
 708         *len16 = DIV_ROUND_UP(sizeof wqe->inv, 16);
 709         return 0;
 710 }
 711
 712 static void free_qp_work(struct work_struct *work)
 713 {
 714         struct c4iw_ucontext *ucontext;
 715         struct c4iw_qp *qhp;
 716         struct c4iw_dev *rhp;
 717
 718         qhp = container_of(work, struct c4iw_qp, free_work);
 719         ucontext = qhp->ucontext;
 720         rhp = qhp->rhp;
 721
 722         pr_debug("qhp %p ucontext %p\n", qhp, ucontext);
 723         destroy_qp(&rhp->rdev, &qhp->wq,
 724                    ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
 725
 726         if (ucontext)
 727                 c4iw_put_ucontext(ucontext);
 728         c4iw_put_wr_wait(qhp->wr_waitp);
 729         kfree(qhp);
 730 }
 731
 732 static void queue_qp_free(struct kref *kref)
 733 {
 734         struct c4iw_qp *qhp;
 735
 736         qhp = container_of(kref, struct c4iw_qp, kref);
 737         pr_debug("qhp %p\n", qhp);
 738         queue_work(qhp->rhp->rdev.free_workq, &qhp->free_work);
 739 }
 740
 741 void c4iw_qp_add_ref(struct ib_qp *qp)
 742 {
 743         pr_debug("ib_qp %p\n", qp);
 744         kref_get(&to_c4iw_qp(qp)->kref);
 745 }
 746
 747 void c4iw_qp_rem_ref(struct ib_qp *qp)
 748 {
 749         pr_debug("ib_qp %p\n", qp);
 750         kref_put(&to_c4iw_qp(qp)->kref, queue_qp_free);
 751 }
 752
 753 static void add_to_fc_list(struct list_head *head, struct list_head *entry)
 754 {
 755         if (list_empty(entry))
 756                 list_add_tail(entry, head);
 757 }
 758
 759 static int ring_kernel_sq_db(struct c4iw_qp *qhp, u16 inc)
 760 {
 761         unsigned long flags;
 762
 763         spin_lock_irqsave(&qhp->rhp->lock, flags);
 764         spin_lock(&qhp->lock);
 765         if (qhp->rhp->db_state == NORMAL)
 766                 t4_ring_sq_db(&qhp->wq, inc, NULL);
 767         else {
 768                 add_to_fc_list(&qhp->rhp->db_fc_list, &qhp->db_fc_entry);
 769                 qhp->wq.sq.wq_pidx_inc += inc;
 770         }
 771         spin_unlock(&qhp->lock);
 772         spin_unlock_irqrestore(&qhp->rhp->lock, flags);
 773         return 0;
 774 }
 775
 776 static int ring_kernel_rq_db(struct c4iw_qp *qhp, u16 inc)
 777 {
 778         unsigned long flags;
 779
 780         spin_lock_irqsave(&qhp->rhp->lock, flags);
 781         spin_lock(&qhp->lock);
 782         if (qhp->rhp->db_state == NORMAL)
 783                 t4_ring_rq_db(&qhp->wq, inc, NULL);
 784         else {
 785                 add_to_fc_list(&qhp->rhp->db_fc_list, &qhp->db_fc_entry);
 786                 qhp->wq.rq.wq_pidx_inc += inc;
 787         }
 788         spin_unlock(&qhp->lock);
 789         spin_unlock_irqrestore(&qhp->rhp->lock, flags);
 790         return 0;
 791 }
 792
 793 static void complete_sq_drain_wr(struct c4iw_qp *qhp, struct ib_send_wr *wr)
 794 {
 795         struct t4_cqe cqe = {};
 796         struct c4iw_cq *schp;
 797         unsigned long flag;
 798         struct t4_cq *cq;
 799
 800         schp = to_c4iw_cq(qhp->ibqp.send_cq);
 801         cq = &schp->cq;
 802
 803         cqe.u.drain_cookie = wr->wr_id;
 804         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 805                                  CQE_OPCODE_V(C4IW_DRAIN_OPCODE) |
 806                                  CQE_TYPE_V(1) |
 807                                  CQE_SWCQE_V(1) |
 808                                  CQE_QPID_V(qhp->wq.sq.qid));
 809
 810         spin_lock_irqsave(&schp->lock, flag);
 811         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 812         cq->sw_queue[cq->sw_pidx] = cqe;
 813         t4_swcq_produce(cq);
 814         spin_unlock_irqrestore(&schp->lock, flag);
 815
 816         spin_lock_irqsave(&schp->comp_handler_lock, flag);
 817         (*schp->ibcq.comp_handler)(&schp->ibcq,
 818                                    schp->ibcq.cq_context);
 819         spin_unlock_irqrestore(&schp->comp_handler_lock, flag);
 820 }
 821
 822 static void complete_rq_drain_wr(struct c4iw_qp *qhp, struct ib_recv_wr *wr)
 823 {
 824         struct t4_cqe cqe = {};
 825         struct c4iw_cq *rchp;
 826         unsigned long flag;
 827         struct t4_cq *cq;
 828
 829         rchp = to_c4iw_cq(qhp->ibqp.recv_cq);
 830         cq = &rchp->cq;
 831
 832         cqe.u.drain_cookie = wr->wr_id;
 833         cqe.header = cpu_to_be32(CQE_STATUS_V(T4_ERR_SWFLUSH) |
 834                                  CQE_OPCODE_V(C4IW_DRAIN_OPCODE) |
 835                                  CQE_TYPE_V(0) |
 836                                  CQE_SWCQE_V(1) |
 837                                  CQE_QPID_V(qhp->wq.sq.qid));
 838
 839         spin_lock_irqsave(&rchp->lock, flag);
 840         cqe.bits_type_ts = cpu_to_be64(CQE_GENBIT_V((u64)cq->gen));
 841         cq->sw_queue[cq->sw_pidx] = cqe;
 842         t4_swcq_produce(cq);
 843         spin_unlock_irqrestore(&rchp->lock, flag);
 844
 845         spin_lock_irqsave(&rchp->comp_handler_lock, flag);
 846         (*rchp->ibcq.comp_handler)(&rchp->ibcq,
 847                                    rchp->ibcq.cq_context);
 848         spin_unlock_irqrestore(&rchp->comp_handler_lock, flag);
 849 }
 850
 851 int c4iw_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 852                    struct ib_send_wr **bad_wr)
 853 {
 854         int err = 0;
 855         u8 len16 = 0;
 856         enum fw_wr_opcodes fw_opcode = 0;
 857         enum fw_ri_wr_flags fw_flags;
 858         struct c4iw_qp *qhp;
 859         union t4_wr *wqe = NULL;
 860         u32 num_wrs;
 861         struct t4_swsqe *swsqe;
 862         unsigned long flag;
 863         u16 idx = 0;
 864
 865         qhp = to_c4iw_qp(ibqp);
 866         spin_lock_irqsave(&qhp->lock, flag);
 867         if (t4_wq_in_error(&qhp->wq)) {
 868                 spin_unlock_irqrestore(&qhp->lock, flag);
 869                 complete_sq_drain_wr(qhp, wr);
 870                 return err;
 871         }
 872         num_wrs = t4_sq_avail(&qhp->wq);
 873         if (num_wrs == 0) {
 874                 spin_unlock_irqrestore(&qhp->lock, flag);
 875                 *bad_wr = wr;
 876                 return -ENOMEM;
 877         }
 878         while (wr) {
 879                 if (num_wrs == 0) {
 880                         err = -ENOMEM;
 881                         *bad_wr = wr;
 882                         break;
 883                 }
 884                 wqe = (union t4_wr *)((u8 *)qhp->wq.sq.queue +
 885                       qhp->wq.sq.wq_pidx * T4_EQ_ENTRY_SIZE);
 886
 887                 fw_flags = 0;
 888                 if (wr->send_flags & IB_SEND_SOLICITED)
 889                         fw_flags |= FW_RI_SOLICITED_EVENT_FLAG;
 890                 if (wr->send_flags & IB_SEND_SIGNALED || qhp->sq_sig_all)
 891                         fw_flags |= FW_RI_COMPLETION_FLAG;
 892                 swsqe = &qhp->wq.sq.sw_sq[qhp->wq.sq.pidx];
 893                 switch (wr->opcode) {
 894                 case IB_WR_SEND_WITH_INV:
 895                 case IB_WR_SEND:
 896                         if (wr->send_flags & IB_SEND_FENCE)
 897                                 fw_flags |= FW_RI_READ_FENCE_FLAG;
 898                         fw_opcode = FW_RI_SEND_WR;
 899                         if (wr->opcode == IB_WR_SEND)
 900                                 swsqe->opcode = FW_RI_SEND;
 901                         else
 902                                 swsqe->opcode = FW_RI_SEND_WITH_INV;
 903                         err = build_rdma_send(&qhp->wq.sq, wqe, wr, &len16);
 904                         break;
 905                 case IB_WR_RDMA_WRITE:
 906                         fw_opcode = FW_RI_RDMA_WRITE_WR;
 907                         swsqe->opcode = FW_RI_RDMA_WRITE;
 908                         err = build_rdma_write(&qhp->wq.sq, wqe, wr, &len16);
 909                         break;
 910                 case IB_WR_RDMA_READ:
 911                 case IB_WR_RDMA_READ_WITH_INV:
 912                         fw_opcode = FW_RI_RDMA_READ_WR;
 913                         swsqe->opcode = FW_RI_READ_REQ;
 914                         if (wr->opcode == IB_WR_RDMA_READ_WITH_INV) {
 915                                 c4iw_invalidate_mr(qhp->rhp,
 916                                                    wr->sg_list[0].lkey);
 917                                 fw_flags = FW_RI_RDMA_READ_INVALIDATE;
 918                         } else {
 919                                 fw_flags = 0;
 920                         }
 921                         err = build_rdma_read(wqe, wr, &len16);
 922                         if (err)
 923                                 break;
 924                         swsqe->read_len = wr->sg_list[0].length;
 925                         if (!qhp->wq.sq.oldest_read)
 926                                 qhp->wq.sq.oldest_read = swsqe;
 927                         break;
 928                 case IB_WR_REG_MR: {
 929                         struct c4iw_mr *mhp = to_c4iw_mr(reg_wr(wr)->mr);
 930
 931                         swsqe->opcode = FW_RI_FAST_REGISTER;
 932                         if (qhp->rhp->rdev.lldi.fr_nsmr_tpte_wr_support &&
 933                             !mhp->attr.state && mhp->mpl_len <= 2) {
 934                                 fw_opcode = FW_RI_FR_NSMR_TPTE_WR;
 935                                 build_tpte_memreg(&wqe->fr_tpte, reg_wr(wr),
 936                                                   mhp, &len16);
 937                         } else {
 938                                 fw_opcode = FW_RI_FR_NSMR_WR;
 939                                 err = build_memreg(&qhp->wq.sq, wqe, reg_wr(wr),
 940                                        mhp, &len16,
 941                                        qhp->rhp->rdev.lldi.ulptx_memwrite_dsgl);
 942                                 if (err)
 943                                         break;
 944                         }
 945                         mhp->attr.state = 1;
 946                         break;
 947                 }
 948                 case IB_WR_LOCAL_INV:
 949                         if (wr->send_flags & IB_SEND_FENCE)
 950                                 fw_flags |= FW_RI_LOCAL_FENCE_FLAG;
 951                         fw_opcode = FW_RI_INV_LSTAG_WR;
 952                         swsqe->opcode = FW_RI_LOCAL_INV;
 953                         err = build_inv_stag(wqe, wr, &len16);
 954                         c4iw_invalidate_mr(qhp->rhp, wr->ex.invalidate_rkey);
 955                         break;
 956                 default:
 957                         pr_warn("%s post of type=%d TBD!\n", __func__,
 958                                 wr->opcode);
 959                         err = -EINVAL;
 960                 }
 961                 if (err) {
 962                         *bad_wr = wr;
 963                         break;
 964                 }
 965                 swsqe->idx = qhp->wq.sq.pidx;
 966                 swsqe->complete = 0;
 967                 swsqe->signaled = (wr->send_flags & IB_SEND_SIGNALED) ||
 968                                   qhp->sq_sig_all;
 969                 swsqe->flushed = 0;
 970                 swsqe->wr_id = wr->wr_id;
 971                 if (c4iw_wr_log) {
 972                         swsqe->sge_ts = cxgb4_read_sge_timestamp(
 973                                         qhp->rhp->rdev.lldi.ports[0]);
 974                         getnstimeofday(&swsqe->host_ts);
 975                 }
 976
 977                 init_wr_hdr(wqe, qhp->wq.sq.pidx, fw_opcode, fw_flags, len16);
 978
 979                 pr_debug("cookie 0x%llx pidx 0x%x opcode 0x%x read_len %u\n",
 980                          (unsigned long long)wr->wr_id, qhp->wq.sq.pidx,
 981                          swsqe->opcode, swsqe->read_len);
 982                 wr = wr->next;
 983                 num_wrs--;
 984                 t4_sq_produce(&qhp->wq, len16);
 985                 idx += DIV_ROUND_UP(len16*16, T4_EQ_ENTRY_SIZE);
 986         }
 987         if (!qhp->rhp->rdev.status_page->db_off) {
 988                 t4_ring_sq_db(&qhp->wq, idx, wqe);
 989                 spin_unlock_irqrestore(&qhp->lock, flag);
 990         } else {
 991                 spin_unlock_irqrestore(&qhp->lock, flag);
 992                 ring_kernel_sq_db(qhp, idx);
 993         }
 994         return err;
 995 }
 996
 997 int c4iw_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 998                       struct ib_recv_wr **bad_wr)
 999 {
1000         int err = 0;
1001         struct c4iw_qp *qhp;
1002         union t4_recv_wr *wqe = NULL;
1003         u32 num_wrs;
1004         u8 len16 = 0;
1005         unsigned long flag;
1006         u16 idx = 0;
1007
1008         qhp = to_c4iw_qp(ibqp);
1009         spin_lock_irqsave(&qhp->lock, flag);
1010         if (t4_wq_in_error(&qhp->wq)) {
1011                 spin_unlock_irqrestore(&qhp->lock, flag);
1012                 complete_rq_drain_wr(qhp, wr);
1013                 return err;
1014         }
1015         num_wrs = t4_rq_avail(&qhp->wq);
1016         if (num_wrs == 0) {
1017                 spin_unlock_irqrestore(&qhp->lock, flag);
1018                 *bad_wr = wr;
1019                 return -ENOMEM;
1020         }
1021         while (wr) {
1022                 if (wr->num_sge > T4_MAX_RECV_SGE) {
1023                         err = -EINVAL;
1024                         *bad_wr = wr;
1025                         break;
1026                 }
1027                 wqe = (union t4_recv_wr *)((u8 *)qhp->wq.rq.queue +
1028                                            qhp->wq.rq.wq_pidx *
1029                                            T4_EQ_ENTRY_SIZE);
1030                 if (num_wrs)
1031                         err = build_rdma_recv(qhp, wqe, wr, &len16);
1032                 else
1033                         err = -ENOMEM;
1034                 if (err) {
1035                         *bad_wr = wr;
1036                         break;
1037                 }
1038
1039                 qhp->wq.rq.sw_rq[qhp->wq.rq.pidx].wr_id = wr->wr_id;
1040                 if (c4iw_wr_log) {
1041                         qhp->wq.rq.sw_rq[qhp->wq.rq.pidx].sge_ts =
1042                                 cxgb4_read_sge_timestamp(
1043                                                 qhp->rhp->rdev.lldi.ports[0]);
1044                         getnstimeofday(
1045                                 &qhp->wq.rq.sw_rq[qhp->wq.rq.pidx].host_ts);
1046                 }
1047
1048                 wqe->recv.opcode = FW_RI_RECV_WR;
1049                 wqe->recv.r1 = 0;
1050                 wqe->recv.wrid = qhp->wq.rq.pidx;
1051                 wqe->recv.r2[0] = 0;
1052                 wqe->recv.r2[1] = 0;
1053                 wqe->recv.r2[2] = 0;
1054                 wqe->recv.len16 = len16;
1055                 pr_debug("cookie 0x%llx pidx %u\n",
1056                          (unsigned long long)wr->wr_id, qhp->wq.rq.pidx);
1057                 t4_rq_produce(&qhp->wq, len16);
1058                 idx += DIV_ROUND_UP(len16*16, T4_EQ_ENTRY_SIZE);
1059                 wr = wr->next;
1060                 num_wrs--;
1061         }
1062         if (!qhp->rhp->rdev.status_page->db_off) {
1063                 t4_ring_rq_db(&qhp->wq, idx, wqe);
1064                 spin_unlock_irqrestore(&qhp->lock, flag);
1065         } else {
1066                 spin_unlock_irqrestore(&qhp->lock, flag);
1067                 ring_kernel_rq_db(qhp, idx);
1068         }
1069         return err;
1070 }
1071
1072 static inline void build_term_codes(struct t4_cqe *err_cqe, u8 *layer_type,
1073                                     u8 *ecode)
1074 {
1075         int status;
1076         int tagged;
1077         int opcode;
1078         int rqtype;
1079         int send_inv;
1080
1081         if (!err_cqe) {
1082                 *layer_type = LAYER_RDMAP|DDP_LOCAL_CATA;
1083                 *ecode = 0;
1084                 return;
1085         }
1086
1087         status = CQE_STATUS(err_cqe);
1088         opcode = CQE_OPCODE(err_cqe);
1089         rqtype = RQ_TYPE(err_cqe);
1090         send_inv = (opcode == FW_RI_SEND_WITH_INV) ||
1091                    (opcode == FW_RI_SEND_WITH_SE_INV);
1092         tagged = (opcode == FW_RI_RDMA_WRITE) ||
1093                  (rqtype && (opcode == FW_RI_READ_RESP));
1094
1095         switch (status) {
1096         case T4_ERR_STAG:
1097                 if (send_inv) {
1098                         *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
1099                         *ecode = RDMAP_CANT_INV_STAG;
1100                 } else {
1101                         *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
1102                         *ecode = RDMAP_INV_STAG;
1103                 }
1104                 break;
1105         case T4_ERR_PDID:
1106                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
1107                 if ((opcode == FW_RI_SEND_WITH_INV) ||
1108                     (opcode == FW_RI_SEND_WITH_SE_INV))
1109                         *ecode = RDMAP_CANT_INV_STAG;
1110                 else
1111                         *ecode = RDMAP_STAG_NOT_ASSOC;
1112                 break;
1113         case T4_ERR_QPID:
1114                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
1115                 *ecode = RDMAP_STAG_NOT_ASSOC;
1116                 break;
1117         case T4_ERR_ACCESS:
1118                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
1119                 *ecode = RDMAP_ACC_VIOL;
1120                 break;
1121         case T4_ERR_WRAP:
1122                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
1123                 *ecode = RDMAP_TO_WRAP;
1124                 break;
1125         case T4_ERR_BOUND:
1126                 if (tagged) {
1127                         *layer_type = LAYER_DDP|DDP_TAGGED_ERR;
1128                         *ecode = DDPT_BASE_BOUNDS;
1129                 } else {
1130                         *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
1131                         *ecode = RDMAP_BASE_BOUNDS;
1132                 }
1133                 break;
1134         case T4_ERR_INVALIDATE_SHARED_MR:
1135         case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND:
1136                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
1137                 *ecode = RDMAP_CANT_INV_STAG;
1138                 break;
1139         case T4_ERR_ECC:
1140         case T4_ERR_ECC_PSTAG:
1141         case T4_ERR_INTERNAL_ERR:
1142                 *layer_type = LAYER_RDMAP|RDMAP_LOCAL_CATA;
1143                 *ecode = 0;
1144                 break;
1145         case T4_ERR_OUT_OF_RQE:
1146                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
1147                 *ecode = DDPU_INV_MSN_NOBUF;
1148                 break;
1149         case T4_ERR_PBL_ADDR_BOUND:
1150                 *layer_type = LAYER_DDP|DDP_TAGGED_ERR;
1151                 *ecode = DDPT_BASE_BOUNDS;
1152                 break;
1153         case T4_ERR_CRC:
1154                 *layer_type = LAYER_MPA|DDP_LLP;
1155                 *ecode = MPA_CRC_ERR;
1156                 break;
1157         case T4_ERR_MARKER:
1158                 *layer_type = LAYER_MPA|DDP_LLP;
1159                 *ecode = MPA_MARKER_ERR;
1160                 break;
1161         case T4_ERR_PDU_LEN_ERR:
1162                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
1163                 *ecode = DDPU_MSG_TOOBIG;
1164                 break;
1165         case T4_ERR_DDP_VERSION:
1166                 if (tagged) {
1167                         *layer_type = LAYER_DDP|DDP_TAGGED_ERR;
1168                         *ecode = DDPT_INV_VERS;
1169                 } else {
1170                         *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
1171                         *ecode = DDPU_INV_VERS;
1172                 }
1173                 break;
1174         case T4_ERR_RDMA_VERSION:
1175                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
1176                 *ecode = RDMAP_INV_VERS;
1177                 break;
1178         case T4_ERR_OPCODE:
1179                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
1180                 *ecode = RDMAP_INV_OPCODE;
1181                 break;
1182         case T4_ERR_DDP_QUEUE_NUM:
1183                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
1184                 *ecode = DDPU_INV_QN;
1185                 break;
1186         case T4_ERR_MSN:
1187         case T4_ERR_MSN_GAP:
1188         case T4_ERR_MSN_RANGE:
1189         case T4_ERR_IRD_OVERFLOW:
1190                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
1191                 *ecode = DDPU_INV_MSN_RANGE;
1192                 break;
1193         case T4_ERR_TBIT:
1194                 *layer_type = LAYER_DDP|DDP_LOCAL_CATA;
1195                 *ecode = 0;
1196                 break;
1197         case T4_ERR_MO:
1198                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
1199                 *ecode = DDPU_INV_MO;
1200                 break;
1201         default:
1202                 *layer_type = LAYER_RDMAP|DDP_LOCAL_CATA;
1203                 *ecode = 0;
1204                 break;
1205         }
1206 }
1207
1208 static void post_terminate(struct c4iw_qp *qhp, struct t4_cqe *err_cqe,
1209                            gfp_t gfp)
1210 {
1211         struct fw_ri_wr *wqe;
1212         struct sk_buff *skb;
1213         struct terminate_message *term;
1214
1215         pr_debug("qhp %p qid 0x%x tid %u\n", qhp, qhp->wq.sq.qid,
1216                  qhp->ep->hwtid);
1217
1218         skb = skb_dequeue(&qhp->ep->com.ep_skb_list);
1219         if (WARN_ON(!skb))
1220                 return;
1221
1222         set_wr_txq(skb, CPL_PRIORITY_DATA, qhp->ep->txq_idx);
1223
1224         wqe = __skb_put(skb, sizeof(*wqe));
1225         memset(wqe, 0, sizeof *wqe);
1226         wqe->op_compl = cpu_to_be32(FW_WR_OP_V(FW_RI_INIT_WR));
1227         wqe->flowid_len16 = cpu_to_be32(
1228                 FW_WR_FLOWID_V(qhp->ep->hwtid) |
1229                 FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*wqe), 16)));
1230
1231         wqe->u.terminate.type = FW_RI_TYPE_TERMINATE;
1232         wqe->u.terminate.immdlen = cpu_to_be32(sizeof *term);
1233         term = (struct terminate_message *)wqe->u.terminate.termmsg;
1234         if (qhp->attr.layer_etype == (LAYER_MPA|DDP_LLP)) {
1235                 term->layer_etype = qhp->attr.layer_etype;
1236                 term->ecode = qhp->attr.ecode;
1237         } else
1238                 build_term_codes(err_cqe, &term->layer_etype, &term->ecode);
1239         c4iw_ofld_send(&qhp->rhp->rdev, skb);
1240 }
1241
1242 /*
1243  * Assumes qhp lock is held.
1244  */
1245 static void __flush_qp(struct c4iw_qp *qhp, struct c4iw_cq *rchp,
1246                        struct c4iw_cq *schp)
1247 {
1248         int count;
1249         int rq_flushed, sq_flushed;
1250         unsigned long flag;
1251
1252         pr_debug("qhp %p rchp %p schp %p\n", qhp, rchp, schp);
1253
1254         /* locking hierarchy: cq lock first, then qp lock. */
1255         spin_lock_irqsave(&rchp->lock, flag);
1256         spin_lock(&qhp->lock);
1257
1258         if (qhp->wq.flushed) {
1259                 spin_unlock(&qhp->lock);
1260                 spin_unlock_irqrestore(&rchp->lock, flag);
1261                 return;
1262         }
1263         qhp->wq.flushed = 1;
1264
1265         c4iw_flush_hw_cq(rchp);
1266         c4iw_count_rcqes(&rchp->cq, &qhp->wq, &count);
1267         rq_flushed = c4iw_flush_rq(&qhp->wq, &rchp->cq, count);
1268         spin_unlock(&qhp->lock);
1269         spin_unlock_irqrestore(&rchp->lock, flag);
1270
1271         /* locking hierarchy: cq lock first, then qp lock. */
1272         spin_lock_irqsave(&schp->lock, flag);
1273         spin_lock(&qhp->lock);
1274         if (schp != rchp)
1275                 c4iw_flush_hw_cq(schp);
1276         sq_flushed = c4iw_flush_sq(qhp);
1277         spin_unlock(&qhp->lock);
1278         spin_unlock_irqrestore(&schp->lock, flag);
1279
1280         if (schp == rchp) {
1281                 if (t4_clear_cq_armed(&rchp->cq) &&
1282                     (rq_flushed || sq_flushed)) {
1283                         spin_lock_irqsave(&rchp->comp_handler_lock, flag);
1284                         (*rchp->ibcq.comp_handler)(&rchp->ibcq,
1285                                                    rchp->ibcq.cq_context);
1286                         spin_unlock_irqrestore(&rchp->comp_handler_lock, flag);
1287                 }
1288         } else {
1289                 if (t4_clear_cq_armed(&rchp->cq) && rq_flushed) {
1290                         spin_lock_irqsave(&rchp->comp_handler_lock, flag);
1291                         (*rchp->ibcq.comp_handler)(&rchp->ibcq,
1292                                                    rchp->ibcq.cq_context);
1293                         spin_unlock_irqrestore(&rchp->comp_handler_lock, flag);
1294                 }
1295                 if (t4_clear_cq_armed(&schp->cq) && sq_flushed) {
1296                         spin_lock_irqsave(&schp->comp_handler_lock, flag);
1297                         (*schp->ibcq.comp_handler)(&schp->ibcq,
1298                                                    schp->ibcq.cq_context);
1299                         spin_unlock_irqrestore(&schp->comp_handler_lock, flag);
1300                 }
1301         }
1302 }
1303
1304 static void flush_qp(struct c4iw_qp *qhp)
1305 {
1306         struct c4iw_cq *rchp, *schp;
1307         unsigned long flag;
1308
1309         rchp = to_c4iw_cq(qhp->ibqp.recv_cq);
1310         schp = to_c4iw_cq(qhp->ibqp.send_cq);
1311
1312         t4_set_wq_in_error(&qhp->wq);
1313         if (qhp->ibqp.uobject) {
1314                 t4_set_cq_in_error(&rchp->cq);
1315                 spin_lock_irqsave(&rchp->comp_handler_lock, flag);
1316                 (*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
1317                 spin_unlock_irqrestore(&rchp->comp_handler_lock, flag);
1318                 if (schp != rchp) {
1319                         t4_set_cq_in_error(&schp->cq);
1320                         spin_lock_irqsave(&schp->comp_handler_lock, flag);
1321                         (*schp->ibcq.comp_handler)(&schp->ibcq,
1322                                         schp->ibcq.cq_context);
1323                         spin_unlock_irqrestore(&schp->comp_handler_lock, flag);
1324                 }
1325                 return;
1326         }
1327         __flush_qp(qhp, rchp, schp);
1328 }
1329
1330 static int rdma_fini(struct c4iw_dev *rhp, struct c4iw_qp *qhp,
1331                      struct c4iw_ep *ep)
1332 {
1333         struct fw_ri_wr *wqe;
1334         int ret;
1335         struct sk_buff *skb;
1336
1337         pr_debug("qhp %p qid 0x%x tid %u\n", qhp, qhp->wq.sq.qid, ep->hwtid);
1338
1339         skb = skb_dequeue(&ep->com.ep_skb_list);
1340         if (WARN_ON(!skb))
1341                 return -ENOMEM;
1342
1343         set_wr_txq(skb, CPL_PRIORITY_DATA, ep->txq_idx);
1344
1345         wqe = __skb_put(skb, sizeof(*wqe));
1346         memset(wqe, 0, sizeof *wqe);
1347         wqe->op_compl = cpu_to_be32(
1348                 FW_WR_OP_V(FW_RI_INIT_WR) |
1349                 FW_WR_COMPL_F);
1350         wqe->flowid_len16 = cpu_to_be32(
1351                 FW_WR_FLOWID_V(ep->hwtid) |
1352                 FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*wqe), 16)));
1353         wqe->cookie = (uintptr_t)ep->com.wr_waitp;
1354
1355         wqe->u.fini.type = FW_RI_TYPE_FINI;
1356
1357         ret = c4iw_ref_send_wait(&rhp->rdev, skb, ep->com.wr_waitp,
1358                                  qhp->ep->hwtid, qhp->wq.sq.qid, __func__);
1359
1360         pr_debug("ret %d\n", ret);
1361         return ret;
1362 }
1363
1364 static void build_rtr_msg(u8 p2p_type, struct fw_ri_init *init)
1365 {
1366         pr_debug("p2p_type = %d\n", p2p_type);
1367         memset(&init->u, 0, sizeof init->u);
1368         switch (p2p_type) {
1369         case FW_RI_INIT_P2PTYPE_RDMA_WRITE:
1370                 init->u.write.opcode = FW_RI_RDMA_WRITE_WR;
1371                 init->u.write.stag_sink = cpu_to_be32(1);
1372                 init->u.write.to_sink = cpu_to_be64(1);
1373                 init->u.write.u.immd_src[0].op = FW_RI_DATA_IMMD;
1374                 init->u.write.len16 = DIV_ROUND_UP(sizeof init->u.write +
1375                                                    sizeof(struct fw_ri_immd),
1376                                                    16);
1377                 break;
1378         case FW_RI_INIT_P2PTYPE_READ_REQ:
1379                 init->u.write.opcode = FW_RI_RDMA_READ_WR;
1380                 init->u.read.stag_src = cpu_to_be32(1);
1381                 init->u.read.to_src_lo = cpu_to_be32(1);
1382                 init->u.read.stag_sink = cpu_to_be32(1);
1383                 init->u.read.to_sink_lo = cpu_to_be32(1);
1384                 init->u.read.len16 = DIV_ROUND_UP(sizeof init->u.read, 16);
1385                 break;
1386         }
1387 }
1388
1389 static int rdma_init(struct c4iw_dev *rhp, struct c4iw_qp *qhp)
1390 {
1391         struct fw_ri_wr *wqe;
1392         int ret;
1393         struct sk_buff *skb;
1394
1395         pr_debug("qhp %p qid 0x%x tid %u ird %u ord %u\n", qhp,
1396                  qhp->wq.sq.qid, qhp->ep->hwtid, qhp->ep->ird, qhp->ep->ord);
1397
1398         skb = alloc_skb(sizeof *wqe, GFP_KERNEL);
1399         if (!skb) {
1400                 ret = -ENOMEM;
1401                 goto out;
1402         }
1403         ret = alloc_ird(rhp, qhp->attr.max_ird);
1404         if (ret) {
1405                 qhp->attr.max_ird = 0;
1406                 kfree_skb(skb);
1407                 goto out;
1408         }
1409         set_wr_txq(skb, CPL_PRIORITY_DATA, qhp->ep->txq_idx);
1410
1411         wqe = __skb_put(skb, sizeof(*wqe));
1412         memset(wqe, 0, sizeof *wqe);
1413         wqe->op_compl = cpu_to_be32(
1414                 FW_WR_OP_V(FW_RI_INIT_WR) |
1415                 FW_WR_COMPL_F);
1416         wqe->flowid_len16 = cpu_to_be32(
1417                 FW_WR_FLOWID_V(qhp->ep->hwtid) |
1418                 FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*wqe), 16)));
1419
1420         wqe->cookie = (uintptr_t)qhp->ep->com.wr_waitp;
1421
1422         wqe->u.init.type = FW_RI_TYPE_INIT;
1423         wqe->u.init.mpareqbit_p2ptype =
1424                 FW_RI_WR_MPAREQBIT_V(qhp->attr.mpa_attr.initiator) |
1425                 FW_RI_WR_P2PTYPE_V(qhp->attr.mpa_attr.p2p_type);
1426         wqe->u.init.mpa_attrs = FW_RI_MPA_IETF_ENABLE;
1427         if (qhp->attr.mpa_attr.recv_marker_enabled)
1428                 wqe->u.init.mpa_attrs |= FW_RI_MPA_RX_MARKER_ENABLE;
1429         if (qhp->attr.mpa_attr.xmit_marker_enabled)
1430                 wqe->u.init.mpa_attrs |= FW_RI_MPA_TX_MARKER_ENABLE;
1431         if (qhp->attr.mpa_attr.crc_enabled)
1432                 wqe->u.init.mpa_attrs |= FW_RI_MPA_CRC_ENABLE;
1433
1434         wqe->u.init.qp_caps = FW_RI_QP_RDMA_READ_ENABLE |
1435                             FW_RI_QP_RDMA_WRITE_ENABLE |
1436                             FW_RI_QP_BIND_ENABLE;
1437         if (!qhp->ibqp.uobject)
1438                 wqe->u.init.qp_caps |= FW_RI_QP_FAST_REGISTER_ENABLE |
1439                                      FW_RI_QP_STAG0_ENABLE;
1440         wqe->u.init.nrqe = cpu_to_be16(t4_rqes_posted(&qhp->wq));
1441         wqe->u.init.pdid = cpu_to_be32(qhp->attr.pd);
1442         wqe->u.init.qpid = cpu_to_be32(qhp->wq.sq.qid);
1443         wqe->u.init.sq_eqid = cpu_to_be32(qhp->wq.sq.qid);
1444         wqe->u.init.rq_eqid = cpu_to_be32(qhp->wq.rq.qid);
1445         wqe->u.init.scqid = cpu_to_be32(qhp->attr.scq);
1446         wqe->u.init.rcqid = cpu_to_be32(qhp->attr.rcq);
1447         wqe->u.init.ord_max = cpu_to_be32(qhp->attr.max_ord);
1448         wqe->u.init.ird_max = cpu_to_be32(qhp->attr.max_ird);
1449         wqe->u.init.iss = cpu_to_be32(qhp->ep->snd_seq);
1450         wqe->u.init.irs = cpu_to_be32(qhp->ep->rcv_seq);
1451         wqe->u.init.hwrqsize = cpu_to_be32(qhp->wq.rq.rqt_size);
1452         wqe->u.init.hwrqaddr = cpu_to_be32(qhp->wq.rq.rqt_hwaddr -
1453                                          rhp->rdev.lldi.vr->rq.start);
1454         if (qhp->attr.mpa_attr.initiator)
1455                 build_rtr_msg(qhp->attr.mpa_attr.p2p_type, &wqe->u.init);
1456
1457         ret = c4iw_ref_send_wait(&rhp->rdev, skb, qhp->ep->com.wr_waitp,
1458                                  qhp->ep->hwtid, qhp->wq.sq.qid, __func__);
1459         if (!ret)
1460                 goto out;
1461
1462         free_ird(rhp, qhp->attr.max_ird);
1463 out:
1464         pr_debug("ret %d\n", ret);
1465         return ret;
1466 }
1467
1468 int c4iw_modify_qp(struct c4iw_dev *rhp, struct c4iw_qp *qhp,
1469                    enum c4iw_qp_attr_mask mask,
1470                    struct c4iw_qp_attributes *attrs,
1471                    int internal)
1472 {
1473         int ret = 0;
1474         struct c4iw_qp_attributes newattr = qhp->attr;
1475         int disconnect = 0;
1476         int terminate = 0;
1477         int abort = 0;
1478         int free = 0;
1479         struct c4iw_ep *ep = NULL;
1480
1481         pr_debug("qhp %p sqid 0x%x rqid 0x%x ep %p state %d -> %d\n",
1482                  qhp, qhp->wq.sq.qid, qhp->wq.rq.qid, qhp->ep, qhp->attr.state,
1483                  (mask & C4IW_QP_ATTR_NEXT_STATE) ? attrs->next_state : -1);
1484
1485         mutex_lock(&qhp->mutex);
1486
1487         /* Process attr changes if in IDLE */
1488         if (mask & C4IW_QP_ATTR_VALID_MODIFY) {
1489                 if (qhp->attr.state != C4IW_QP_STATE_IDLE) {
1490                         ret = -EIO;
1491                         goto out;
1492                 }
1493                 if (mask & C4IW_QP_ATTR_ENABLE_RDMA_READ)
1494                         newattr.enable_rdma_read = attrs->enable_rdma_read;
1495                 if (mask & C4IW_QP_ATTR_ENABLE_RDMA_WRITE)
1496                         newattr.enable_rdma_write = attrs->enable_rdma_write;
1497                 if (mask & C4IW_QP_ATTR_ENABLE_RDMA_BIND)
1498                         newattr.enable_bind = attrs->enable_bind;
1499                 if (mask & C4IW_QP_ATTR_MAX_ORD) {
1500                         if (attrs->max_ord > c4iw_max_read_depth) {
1501                                 ret = -EINVAL;
1502                                 goto out;
1503                         }
1504                         newattr.max_ord = attrs->max_ord;
1505                 }
1506                 if (mask & C4IW_QP_ATTR_MAX_IRD) {
1507                         if (attrs->max_ird > cur_max_read_depth(rhp)) {
1508                                 ret = -EINVAL;
1509                                 goto out;
1510                         }
1511                         newattr.max_ird = attrs->max_ird;
1512                 }
1513                 qhp->attr = newattr;
1514         }
1515
1516         if (mask & C4IW_QP_ATTR_SQ_DB) {
1517                 ret = ring_kernel_sq_db(qhp, attrs->sq_db_inc);
1518                 goto out;
1519         }
1520         if (mask & C4IW_QP_ATTR_RQ_DB) {
1521                 ret = ring_kernel_rq_db(qhp, attrs->rq_db_inc);
1522                 goto out;
1523         }
1524
1525         if (!(mask & C4IW_QP_ATTR_NEXT_STATE))
1526                 goto out;
1527         if (qhp->attr.state == attrs->next_state)
1528                 goto out;
1529
1530         switch (qhp->attr.state) {
1531         case C4IW_QP_STATE_IDLE:
1532                 switch (attrs->next_state) {
1533                 case C4IW_QP_STATE_RTS:
1534                         if (!(mask & C4IW_QP_ATTR_LLP_STREAM_HANDLE)) {
1535                                 ret = -EINVAL;
1536                                 goto out;
1537                         }
1538                         if (!(mask & C4IW_QP_ATTR_MPA_ATTR)) {
1539                                 ret = -EINVAL;
1540                                 goto out;
1541                         }
1542                         qhp->attr.mpa_attr = attrs->mpa_attr;
1543                         qhp->attr.llp_stream_handle = attrs->llp_stream_handle;
1544                         qhp->ep = qhp->attr.llp_stream_handle;
1545                         set_state(qhp, C4IW_QP_STATE_RTS);
1546
1547                         /*
1548                          * Ref the endpoint here and deref when we
1549                          * disassociate the endpoint from the QP.  This
1550                          * happens in CLOSING->IDLE transition or *->ERROR
1551                          * transition.
1552                          */
1553                         c4iw_get_ep(&qhp->ep->com);
1554                         ret = rdma_init(rhp, qhp);
1555                         if (ret)
1556                                 goto err;
1557                         break;
1558                 case C4IW_QP_STATE_ERROR:
1559                         set_state(qhp, C4IW_QP_STATE_ERROR);
1560                         flush_qp(qhp);
1561                         break;
1562                 default:
1563                         ret = -EINVAL;
1564                         goto out;
1565                 }
1566                 break;
1567         case C4IW_QP_STATE_RTS:
1568                 switch (attrs->next_state) {
1569                 case C4IW_QP_STATE_CLOSING:
1570                         t4_set_wq_in_error(&qhp->wq);
1571                         set_state(qhp, C4IW_QP_STATE_CLOSING);
1572                         ep = qhp->ep;
1573                         if (!internal) {
1574                                 abort = 0;
1575                                 disconnect = 1;
1576                                 c4iw_get_ep(&qhp->ep->com);
1577                         }
1578                         ret = rdma_fini(rhp, qhp, ep);
1579                         if (ret)
1580                                 goto err;
1581                         break;
1582                 case C4IW_QP_STATE_TERMINATE:
1583                         t4_set_wq_in_error(&qhp->wq);
1584                         set_state(qhp, C4IW_QP_STATE_TERMINATE);
1585                         qhp->attr.layer_etype = attrs->layer_etype;
1586                         qhp->attr.ecode = attrs->ecode;
1587                         ep = qhp->ep;
1588                         if (!internal) {
1589                                 c4iw_get_ep(&qhp->ep->com);
1590                                 terminate = 1;
1591                                 disconnect = 1;
1592                         } else {
1593                                 terminate = qhp->attr.send_term;
1594                                 ret = rdma_fini(rhp, qhp, ep);
1595                                 if (ret)
1596                                         goto err;
1597                         }
1598                         break;
1599                 case C4IW_QP_STATE_ERROR:
1600                         t4_set_wq_in_error(&qhp->wq);
1601                         set_state(qhp, C4IW_QP_STATE_ERROR);
1602                         if (!internal) {
1603                                 abort = 1;
1604                                 disconnect = 1;
1605                                 ep = qhp->ep;
1606                                 c4iw_get_ep(&qhp->ep->com);
1607                         }
1608                         goto err;
1609                         break;
1610                 default:
1611                         ret = -EINVAL;
1612                         goto out;
1613                 }
1614                 break;
1615         case C4IW_QP_STATE_CLOSING:
1616
1617                 /*
1618                  * Allow kernel users to move to ERROR for qp draining.
1619                  */
1620                 if (!internal && (qhp->ibqp.uobject || attrs->next_state !=
1621                                   C4IW_QP_STATE_ERROR)) {
1622                         ret = -EINVAL;
1623                         goto out;
1624                 }
1625                 switch (attrs->next_state) {
1626                 case C4IW_QP_STATE_IDLE:
1627                         flush_qp(qhp);
1628                         set_state(qhp, C4IW_QP_STATE_IDLE);
1629                         qhp->attr.llp_stream_handle = NULL;
1630                         c4iw_put_ep(&qhp->ep->com);
1631                         qhp->ep = NULL;
1632                         wake_up(&qhp->wait);
1633                         break;
1634                 case C4IW_QP_STATE_ERROR:
1635                         goto err;
1636                 default:
1637                         ret = -EINVAL;
1638                         goto err;
1639                 }
1640                 break;
1641         case C4IW_QP_STATE_ERROR:
1642                 if (attrs->next_state != C4IW_QP_STATE_IDLE) {
1643                         ret = -EINVAL;
1644                         goto out;
1645                 }
1646                 if (!t4_sq_empty(&qhp->wq) || !t4_rq_empty(&qhp->wq)) {
1647                         ret = -EINVAL;
1648                         goto out;
1649                 }
1650                 set_state(qhp, C4IW_QP_STATE_IDLE);
1651                 break;
1652         case C4IW_QP_STATE_TERMINATE:
1653                 if (!internal) {
1654                         ret = -EINVAL;
1655                         goto out;
1656                 }
1657                 goto err;
1658                 break;
1659         default:
1660                 pr_err("%s in a bad state %d\n", __func__, qhp->attr.state);
1661                 ret = -EINVAL;
1662                 goto err;
1663                 break;
1664         }
1665         goto out;
1666 err:
1667         pr_debug("disassociating ep %p qpid 0x%x\n", qhp->ep,
1668                  qhp->wq.sq.qid);
1669
1670         /* disassociate the LLP connection */
1671         qhp->attr.llp_stream_handle = NULL;
1672         if (!ep)
1673                 ep = qhp->ep;
1674         qhp->ep = NULL;
1675         set_state(qhp, C4IW_QP_STATE_ERROR);
1676         free = 1;
1677         abort = 1;
1678         flush_qp(qhp);
1679         wake_up(&qhp->wait);
1680 out:
1681         mutex_unlock(&qhp->mutex);
1682
1683         if (terminate)
1684                 post_terminate(qhp, NULL, internal ? GFP_ATOMIC : GFP_KERNEL);
1685
1686         /*
1687          * If disconnect is 1, then we need to initiate a disconnect
1688          * on the EP.  This can be a normal close (RTS->CLOSING) or
1689          * an abnormal close (RTS/CLOSING->ERROR).
1690          */
1691         if (disconnect) {
1692                 c4iw_ep_disconnect(ep, abort, internal ? GFP_ATOMIC :
1693                                                          GFP_KERNEL);
1694                 c4iw_put_ep(&ep->com);
1695         }
1696
1697         /*
1698          * If free is 1, then we've disassociated the EP from the QP
1699          * and we need to dereference the EP.
1700          */
1701         if (free)
1702                 c4iw_put_ep(&ep->com);
1703         pr_debug("exit state %d\n", qhp->attr.state);
1704         return ret;
1705 }
1706
1707 int c4iw_destroy_qp(struct ib_qp *ib_qp)
1708 {
1709         struct c4iw_dev *rhp;
1710         struct c4iw_qp *qhp;
1711         struct c4iw_qp_attributes attrs;
1712
1713         qhp = to_c4iw_qp(ib_qp);
1714         rhp = qhp->rhp;
1715
1716         attrs.next_state = C4IW_QP_STATE_ERROR;
1717         if (qhp->attr.state == C4IW_QP_STATE_TERMINATE)
1718                 c4iw_modify_qp(rhp, qhp, C4IW_QP_ATTR_NEXT_STATE, &attrs, 1);
1719         else
1720                 c4iw_modify_qp(rhp, qhp, C4IW_QP_ATTR_NEXT_STATE, &attrs, 0);
1721         wait_event(qhp->wait, !qhp->ep);
1722
1723         remove_handle(rhp, &rhp->qpidr, qhp->wq.sq.qid);
1724
1725         spin_lock_irq(&rhp->lock);
1726         if (!list_empty(&qhp->db_fc_entry))
1727                 list_del_init(&qhp->db_fc_entry);
1728         spin_unlock_irq(&rhp->lock);
1729         free_ird(rhp, qhp->attr.max_ird);
1730
1731         c4iw_qp_rem_ref(ib_qp);
1732
1733         pr_debug("ib_qp %p qpid 0x%0x\n", ib_qp, qhp->wq.sq.qid);
1734         return 0;
1735 }
1736
1737 struct ib_qp *c4iw_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *attrs,
1738                              struct ib_udata *udata)
1739 {
1740         struct c4iw_dev *rhp;
1741         struct c4iw_qp *qhp;
1742         struct c4iw_pd *php;
1743         struct c4iw_cq *schp;
1744         struct c4iw_cq *rchp;
1745         struct c4iw_create_qp_resp uresp;
1746         unsigned int sqsize, rqsize;
1747         struct c4iw_ucontext *ucontext;
1748         int ret;
1749         struct c4iw_mm_entry *sq_key_mm, *rq_key_mm = NULL, *sq_db_key_mm;
1750         struct c4iw_mm_entry *rq_db_key_mm = NULL, *ma_sync_key_mm = NULL;
1751
1752         pr_debug("ib_pd %p\n", pd);
1753
1754         if (attrs->qp_type != IB_QPT_RC)
1755                 return ERR_PTR(-EINVAL);
1756
1757         php = to_c4iw_pd(pd);
1758         rhp = php->rhp;
1759         schp = get_chp(rhp, ((struct c4iw_cq *)attrs->send_cq)->cq.cqid);
1760         rchp = get_chp(rhp, ((struct c4iw_cq *)attrs->recv_cq)->cq.cqid);
1761         if (!schp || !rchp)
1762                 return ERR_PTR(-EINVAL);
1763
1764         if (attrs->cap.max_inline_data > T4_MAX_SEND_INLINE)
1765                 return ERR_PTR(-EINVAL);
1766
1767         if (attrs->cap.max_recv_wr > rhp->rdev.hw_queue.t4_max_rq_size)
1768                 return ERR_PTR(-E2BIG);
1769         rqsize = attrs->cap.max_recv_wr + 1;
1770         if (rqsize < 8)
1771                 rqsize = 8;
1772
1773         if (attrs->cap.max_send_wr > rhp->rdev.hw_queue.t4_max_sq_size)
1774                 return ERR_PTR(-E2BIG);
1775         sqsize = attrs->cap.max_send_wr + 1;
1776         if (sqsize < 8)
1777                 sqsize = 8;
1778
1779         ucontext = pd->uobject ? to_c4iw_ucontext(pd->uobject->context) : NULL;
1780
1781         qhp = kzalloc(sizeof(*qhp), GFP_KERNEL);
1782         if (!qhp)
1783                 return ERR_PTR(-ENOMEM);
1784
1785         qhp->wr_waitp = c4iw_alloc_wr_wait(GFP_KERNEL);
1786         if (!qhp->wr_waitp) {
1787                 ret = -ENOMEM;
1788                 goto err_free_qhp;
1789         }
1790
1791         qhp->wq.sq.size = sqsize;
1792         qhp->wq.sq.memsize =
1793                 (sqsize + rhp->rdev.hw_queue.t4_eq_status_entries) *
1794                 sizeof(*qhp->wq.sq.queue) + 16 * sizeof(__be64);
1795         qhp->wq.sq.flush_cidx = -1;
1796         qhp->wq.rq.size = rqsize;
1797         qhp->wq.rq.memsize =
1798                 (rqsize + rhp->rdev.hw_queue.t4_eq_status_entries) *
1799                 sizeof(*qhp->wq.rq.queue);
1800
1801         if (ucontext) {
1802                 qhp->wq.sq.memsize = roundup(qhp->wq.sq.memsize, PAGE_SIZE);
1803                 qhp->wq.rq.memsize = roundup(qhp->wq.rq.memsize, PAGE_SIZE);
1804         }
1805
1806         ret = create_qp(&rhp->rdev, &qhp->wq, &schp->cq, &rchp->cq,
1807                         ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
1808                         qhp->wr_waitp);
1809         if (ret)
1810                 goto err_free_wr_wait;
1811
1812         attrs->cap.max_recv_wr = rqsize - 1;
1813         attrs->cap.max_send_wr = sqsize - 1;
1814         attrs->cap.max_inline_data = T4_MAX_SEND_INLINE;
1815
1816         qhp->rhp = rhp;
1817         qhp->attr.pd = php->pdid;
1818         qhp->attr.scq = ((struct c4iw_cq *) attrs->send_cq)->cq.cqid;
1819         qhp->attr.rcq = ((struct c4iw_cq *) attrs->recv_cq)->cq.cqid;
1820         qhp->attr.sq_num_entries = attrs->cap.max_send_wr;
1821         qhp->attr.rq_num_entries = attrs->cap.max_recv_wr;
1822         qhp->attr.sq_max_sges = attrs->cap.max_send_sge;
1823         qhp->attr.sq_max_sges_rdma_write = attrs->cap.max_send_sge;
1824         qhp->attr.rq_max_sges = attrs->cap.max_recv_sge;
1825         qhp->attr.state = C4IW_QP_STATE_IDLE;
1826         qhp->attr.next_state = C4IW_QP_STATE_IDLE;
1827         qhp->attr.enable_rdma_read = 1;
1828         qhp->attr.enable_rdma_write = 1;
1829         qhp->attr.enable_bind = 1;
1830         qhp->attr.max_ord = 0;
1831         qhp->attr.max_ird = 0;
1832         qhp->sq_sig_all = attrs->sq_sig_type == IB_SIGNAL_ALL_WR;
1833         spin_lock_init(&qhp->lock);
1834         mutex_init(&qhp->mutex);
1835         init_waitqueue_head(&qhp->wait);
1836         kref_init(&qhp->kref);
1837         INIT_WORK(&qhp->free_work, free_qp_work);
1838
1839         ret = insert_handle(rhp, &rhp->qpidr, qhp, qhp->wq.sq.qid);
1840         if (ret)
1841                 goto err_destroy_qp;
1842
1843         if (udata && ucontext) {
1844                 sq_key_mm = kmalloc(sizeof(*sq_key_mm), GFP_KERNEL);
1845                 if (!sq_key_mm) {
1846                         ret = -ENOMEM;
1847                         goto err_remove_handle;
1848                 }
1849                 rq_key_mm = kmalloc(sizeof(*rq_key_mm), GFP_KERNEL);
1850                 if (!rq_key_mm) {
1851                         ret = -ENOMEM;
1852                         goto err_free_sq_key;
1853                 }
1854                 sq_db_key_mm = kmalloc(sizeof(*sq_db_key_mm), GFP_KERNEL);
1855                 if (!sq_db_key_mm) {
1856                         ret = -ENOMEM;
1857                         goto err_free_rq_key;
1858                 }
1859                 rq_db_key_mm = kmalloc(sizeof(*rq_db_key_mm), GFP_KERNEL);
1860                 if (!rq_db_key_mm) {
1861                         ret = -ENOMEM;
1862                         goto err_free_sq_db_key;
1863                 }
1864                 if (t4_sq_onchip(&qhp->wq.sq)) {
1865                         ma_sync_key_mm = kmalloc(sizeof(*ma_sync_key_mm),
1866                                                  GFP_KERNEL);
1867                         if (!ma_sync_key_mm) {
1868                                 ret = -ENOMEM;
1869                                 goto err_free_rq_db_key;
1870                         }
1871                         uresp.flags = C4IW_QPF_ONCHIP;
1872                 } else
1873                         uresp.flags = 0;
1874                 uresp.qid_mask = rhp->rdev.qpmask;
1875                 uresp.sqid = qhp->wq.sq.qid;
1876                 uresp.sq_size = qhp->wq.sq.size;
1877                 uresp.sq_memsize = qhp->wq.sq.memsize;
1878                 uresp.rqid = qhp->wq.rq.qid;
1879                 uresp.rq_size = qhp->wq.rq.size;
1880                 uresp.rq_memsize = qhp->wq.rq.memsize;
1881                 spin_lock(&ucontext->mmap_lock);
1882                 if (ma_sync_key_mm) {
1883                         uresp.ma_sync_key = ucontext->key;
1884                         ucontext->key += PAGE_SIZE;
1885                 } else {
1886                         uresp.ma_sync_key =  0;
1887                 }
1888                 uresp.sq_key = ucontext->key;
1889                 ucontext->key += PAGE_SIZE;
1890                 uresp.rq_key = ucontext->key;
1891                 ucontext->key += PAGE_SIZE;
1892                 uresp.sq_db_gts_key = ucontext->key;
1893                 ucontext->key += PAGE_SIZE;
1894                 uresp.rq_db_gts_key = ucontext->key;
1895                 ucontext->key += PAGE_SIZE;
1896                 spin_unlock(&ucontext->mmap_lock);
1897                 ret = ib_copy_to_udata(udata, &uresp, sizeof uresp);
1898                 if (ret)
1899                         goto err_free_ma_sync_key;
1900                 sq_key_mm->key = uresp.sq_key;
1901                 sq_key_mm->addr = qhp->wq.sq.phys_addr;
1902                 sq_key_mm->len = PAGE_ALIGN(qhp->wq.sq.memsize);
1903                 insert_mmap(ucontext, sq_key_mm);
1904                 rq_key_mm->key = uresp.rq_key;
1905                 rq_key_mm->addr = virt_to_phys(qhp->wq.rq.queue);
1906                 rq_key_mm->len = PAGE_ALIGN(qhp->wq.rq.memsize);
1907                 insert_mmap(ucontext, rq_key_mm);
1908                 sq_db_key_mm->key = uresp.sq_db_gts_key;
1909                 sq_db_key_mm->addr = (u64)(unsigned long)qhp->wq.sq.bar2_pa;
1910                 sq_db_key_mm->len = PAGE_SIZE;
1911                 insert_mmap(ucontext, sq_db_key_mm);
1912                 rq_db_key_mm->key = uresp.rq_db_gts_key;
1913                 rq_db_key_mm->addr = (u64)(unsigned long)qhp->wq.rq.bar2_pa;
1914                 rq_db_key_mm->len = PAGE_SIZE;
1915                 insert_mmap(ucontext, rq_db_key_mm);
1916                 if (ma_sync_key_mm) {
1917                         ma_sync_key_mm->key = uresp.ma_sync_key;
1918                         ma_sync_key_mm->addr =
1919                                 (pci_resource_start(rhp->rdev.lldi.pdev, 0) +
1920                                 PCIE_MA_SYNC_A) & PAGE_MASK;
1921                         ma_sync_key_mm->len = PAGE_SIZE;
1922                         insert_mmap(ucontext, ma_sync_key_mm);
1923                 }
1924
1925                 c4iw_get_ucontext(ucontext);
1926                 qhp->ucontext = ucontext;
1927         }
1928         qhp->ibqp.qp_num = qhp->wq.sq.qid;
1929         INIT_LIST_HEAD(&qhp->db_fc_entry);
1930         pr_debug("sq id %u size %u memsize %zu num_entries %u rq id %u size %u memsize %zu num_entries %u\n",
1931                  qhp->wq.sq.qid, qhp->wq.sq.size, qhp->wq.sq.memsize,
1932                  attrs->cap.max_send_wr, qhp->wq.rq.qid, qhp->wq.rq.size,
1933                  qhp->wq.rq.memsize, attrs->cap.max_recv_wr);
1934         return &qhp->ibqp;
1935 err_free_ma_sync_key:
1936         kfree(ma_sync_key_mm);
1937 err_free_rq_db_key:
1938         kfree(rq_db_key_mm);
1939 err_free_sq_db_key:
1940         kfree(sq_db_key_mm);
1941 err_free_rq_key:
1942         kfree(rq_key_mm);
1943 err_free_sq_key:
1944         kfree(sq_key_mm);
1945 err_remove_handle:
1946         remove_handle(rhp, &rhp->qpidr, qhp->wq.sq.qid);
1947 err_destroy_qp:
1948         destroy_qp(&rhp->rdev, &qhp->wq,
1949                    ucontext ? &ucontext->uctx : &rhp->rdev.uctx);
1950 err_free_wr_wait:
1951         c4iw_put_wr_wait(qhp->wr_waitp);
1952 err_free_qhp:
1953         kfree(qhp);
1954         return ERR_PTR(ret);
1955 }
1956
1957 int c4iw_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
1958                       int attr_mask, struct ib_udata *udata)
1959 {
1960         struct c4iw_dev *rhp;
1961         struct c4iw_qp *qhp;
1962         enum c4iw_qp_attr_mask mask = 0;
1963         struct c4iw_qp_attributes attrs;
1964
1965         pr_debug("ib_qp %p\n", ibqp);
1966
1967         /* iwarp does not support the RTR state */
1968         if ((attr_mask & IB_QP_STATE) && (attr->qp_state == IB_QPS_RTR))
1969                 attr_mask &= ~IB_QP_STATE;
1970
1971         /* Make sure we still have something left to do */
1972         if (!attr_mask)
1973                 return 0;
1974
1975         memset(&attrs, 0, sizeof attrs);
1976         qhp = to_c4iw_qp(ibqp);
1977         rhp = qhp->rhp;
1978
1979         attrs.next_state = c4iw_convert_state(attr->qp_state);
1980         attrs.enable_rdma_read = (attr->qp_access_flags &
1981                                IB_ACCESS_REMOTE_READ) ?  1 : 0;
1982         attrs.enable_rdma_write = (attr->qp_access_flags &
1983                                 IB_ACCESS_REMOTE_WRITE) ? 1 : 0;
1984         attrs.enable_bind = (attr->qp_access_flags & IB_ACCESS_MW_BIND) ? 1 : 0;
1985
1986
1987         mask |= (attr_mask & IB_QP_STATE) ? C4IW_QP_ATTR_NEXT_STATE : 0;
1988         mask |= (attr_mask & IB_QP_ACCESS_FLAGS) ?
1989                         (C4IW_QP_ATTR_ENABLE_RDMA_READ |
1990                          C4IW_QP_ATTR_ENABLE_RDMA_WRITE |
1991                          C4IW_QP_ATTR_ENABLE_RDMA_BIND) : 0;
1992
1993         /*
1994          * Use SQ_PSN and RQ_PSN to pass in IDX_INC values for
1995          * ringing the queue db when we're in DB_FULL mode.
1996          * Only allow this on T4 devices.
1997          */
1998         attrs.sq_db_inc = attr->sq_psn;
1999         attrs.rq_db_inc = attr->rq_psn;
2000         mask |= (attr_mask & IB_QP_SQ_PSN) ? C4IW_QP_ATTR_SQ_DB : 0;
2001         mask |= (attr_mask & IB_QP_RQ_PSN) ? C4IW_QP_ATTR_RQ_DB : 0;
2002         if (!is_t4(to_c4iw_qp(ibqp)->rhp->rdev.lldi.adapter_type) &&
2003             (mask & (C4IW_QP_ATTR_SQ_DB|C4IW_QP_ATTR_RQ_DB)))
2004                 return -EINVAL;
2005
2006         return c4iw_modify_qp(rhp, qhp, mask, &attrs, 0);
2007 }
2008
2009 struct ib_qp *c4iw_get_qp(struct ib_device *dev, int qpn)
2010 {
2011         pr_debug("ib_dev %p qpn 0x%x\n", dev, qpn);
2012         return (struct ib_qp *)get_qhp(to_c4iw_dev(dev), qpn);
2013 }
2014
2015 int c4iw_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
2016                      int attr_mask, struct ib_qp_init_attr *init_attr)
2017 {
2018         struct c4iw_qp *qhp = to_c4iw_qp(ibqp);
2019
2020         memset(attr, 0, sizeof *attr);
2021         memset(init_attr, 0, sizeof *init_attr);
2022         attr->qp_state = to_ib_qp_state(qhp->attr.state);
2023         init_attr->cap.max_send_wr = qhp->attr.sq_num_entries;
2024         init_attr->cap.max_recv_wr = qhp->attr.rq_num_entries;
2025         init_attr->cap.max_send_sge = qhp->attr.sq_max_sges;
2026         init_attr->cap.max_recv_sge = qhp->attr.sq_max_sges;
2027         init_attr->cap.max_inline_data = T4_MAX_SEND_INLINE;
2028         init_attr->sq_sig_type = qhp->sq_sig_all ? IB_SIGNAL_ALL_WR : 0;
2029         return 0;
2030 }