drivers/infiniband/hw/cxgb3/iwch_qp.c

   1 /*
   2  * Copyright (c) 2006 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 #include <linux/sched.h>
  33 #include "iwch_provider.h"
  34 #include "iwch.h"
  35 #include "iwch_cm.h"
  36 #include "cxio_hal.h"
  37 #include "cxio_resource.h"
  38
  39 #define NO_SUPPORT -1
  40
  41 static int build_rdma_send(union t3_wr *wqe, struct ib_send_wr *wr,
  42                                 u8 * flit_cnt)
  43 {
  44         int i;
  45         u32 plen;
  46
  47         switch (wr->opcode) {
  48         case IB_WR_SEND:
  49                 if (wr->send_flags & IB_SEND_SOLICITED)
  50                         wqe->send.rdmaop = T3_SEND_WITH_SE;
  51                 else
  52                         wqe->send.rdmaop = T3_SEND;
  53                 wqe->send.rem_stag = 0;
  54                 break;
  55         case IB_WR_SEND_WITH_INV:
  56                 if (wr->send_flags & IB_SEND_SOLICITED)
  57                         wqe->send.rdmaop = T3_SEND_WITH_SE_INV;
  58                 else
  59                         wqe->send.rdmaop = T3_SEND_WITH_INV;
  60                 wqe->send.rem_stag = cpu_to_be32(wr->ex.invalidate_rkey);
  61                 break;
  62         default:
  63                 return -EINVAL;
  64         }
  65         if (wr->num_sge > T3_MAX_SGE)
  66                 return -EINVAL;
  67         wqe->send.reserved[0] = 0;
  68         wqe->send.reserved[1] = 0;
  69         wqe->send.reserved[2] = 0;
  70         plen = 0;
  71         for (i = 0; i < wr->num_sge; i++) {
  72                 if ((plen + wr->sg_list[i].length) < plen)
  73                         return -EMSGSIZE;
  74
  75                 plen += wr->sg_list[i].length;
  76                 wqe->send.sgl[i].stag = cpu_to_be32(wr->sg_list[i].lkey);
  77                 wqe->send.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
  78                 wqe->send.sgl[i].to = cpu_to_be64(wr->sg_list[i].addr);
  79         }
  80         wqe->send.num_sgle = cpu_to_be32(wr->num_sge);
  81         *flit_cnt = 4 + ((wr->num_sge) << 1);
  82         wqe->send.plen = cpu_to_be32(plen);
  83         return 0;
  84 }
  85
  86 static int build_rdma_write(union t3_wr *wqe, struct ib_send_wr *wr,
  87                                  u8 *flit_cnt)
  88 {
  89         int i;
  90         u32 plen;
  91         if (wr->num_sge > T3_MAX_SGE)
  92                 return -EINVAL;
  93         wqe->write.rdmaop = T3_RDMA_WRITE;
  94         wqe->write.reserved[0] = 0;
  95         wqe->write.reserved[1] = 0;
  96         wqe->write.reserved[2] = 0;
  97         wqe->write.stag_sink = cpu_to_be32(wr->wr.rdma.rkey);
  98         wqe->write.to_sink = cpu_to_be64(wr->wr.rdma.remote_addr);
  99
 100         if (wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
 101                 plen = 4;
 102                 wqe->write.sgl[0].stag = wr->ex.imm_data;
 103                 wqe->write.sgl[0].len = cpu_to_be32(0);
 104                 wqe->write.num_sgle = cpu_to_be32(0);
 105                 *flit_cnt = 6;
 106         } else {
 107                 plen = 0;
 108                 for (i = 0; i < wr->num_sge; i++) {
 109                         if ((plen + wr->sg_list[i].length) < plen) {
 110                                 return -EMSGSIZE;
 111                         }
 112                         plen += wr->sg_list[i].length;
 113                         wqe->write.sgl[i].stag =
 114                             cpu_to_be32(wr->sg_list[i].lkey);
 115                         wqe->write.sgl[i].len =
 116                             cpu_to_be32(wr->sg_list[i].length);
 117                         wqe->write.sgl[i].to =
 118                             cpu_to_be64(wr->sg_list[i].addr);
 119                 }
 120                 wqe->write.num_sgle = cpu_to_be32(wr->num_sge);
 121                 *flit_cnt = 5 + ((wr->num_sge) << 1);
 122         }
 123         wqe->write.plen = cpu_to_be32(plen);
 124         return 0;
 125 }
 126
 127 static int build_rdma_read(union t3_wr *wqe, struct ib_send_wr *wr,
 128                                 u8 *flit_cnt)
 129 {
 130         if (wr->num_sge > 1)
 131                 return -EINVAL;
 132         wqe->read.rdmaop = T3_READ_REQ;
 133         if (wr->opcode == IB_WR_RDMA_READ_WITH_INV)
 134                 wqe->read.local_inv = 1;
 135         else
 136                 wqe->read.local_inv = 0;
 137         wqe->read.reserved[0] = 0;
 138         wqe->read.reserved[1] = 0;
 139         wqe->read.rem_stag = cpu_to_be32(wr->wr.rdma.rkey);
 140         wqe->read.rem_to = cpu_to_be64(wr->wr.rdma.remote_addr);
 141         wqe->read.local_stag = cpu_to_be32(wr->sg_list[0].lkey);
 142         wqe->read.local_len = cpu_to_be32(wr->sg_list[0].length);
 143         wqe->read.local_to = cpu_to_be64(wr->sg_list[0].addr);
 144         *flit_cnt = sizeof(struct t3_rdma_read_wr) >> 3;
 145         return 0;
 146 }
 147
 148 static int build_fastreg(union t3_wr *wqe, struct ib_send_wr *wr,
 149                                 u8 *flit_cnt, int *wr_cnt, struct t3_wq *wq)
 150 {
 151         int i;
 152         __be64 *p;
 153
 154         if (wr->wr.fast_reg.page_list_len > T3_MAX_FASTREG_DEPTH)
 155                 return -EINVAL;
 156         *wr_cnt = 1;
 157         wqe->fastreg.stag = cpu_to_be32(wr->wr.fast_reg.rkey);
 158         wqe->fastreg.len = cpu_to_be32(wr->wr.fast_reg.length);
 159         wqe->fastreg.va_base_hi = cpu_to_be32(wr->wr.fast_reg.iova_start >> 32);
 160         wqe->fastreg.va_base_lo_fbo =
 161                                 cpu_to_be32(wr->wr.fast_reg.iova_start & 0xffffffff);
 162         wqe->fastreg.page_type_perms = cpu_to_be32(
 163                 V_FR_PAGE_COUNT(wr->wr.fast_reg.page_list_len) |
 164                 V_FR_PAGE_SIZE(wr->wr.fast_reg.page_shift-12) |
 165                 V_FR_TYPE(TPT_VATO) |
 166                 V_FR_PERMS(iwch_ib_to_tpt_access(wr->wr.fast_reg.access_flags)));
 167         p = &wqe->fastreg.pbl_addrs[0];
 168         for (i = 0; i < wr->wr.fast_reg.page_list_len; i++, p++) {
 169
 170                 /* If we need a 2nd WR, then set it up */
 171                 if (i == T3_MAX_FASTREG_FRAG) {
 172                         *wr_cnt = 2;
 173                         wqe = (union t3_wr *)(wq->queue +
 174                                 Q_PTR2IDX((wq->wptr+1), wq->size_log2));
 175                         build_fw_riwrh((void *)wqe, T3_WR_FASTREG, 0,
 176                                Q_GENBIT(wq->wptr + 1, wq->size_log2),
 177                                0, 1 + wr->wr.fast_reg.page_list_len - T3_MAX_FASTREG_FRAG,
 178                                T3_EOP);
 179
 180                         p = &wqe->pbl_frag.pbl_addrs[0];
 181                 }
 182                 *p = cpu_to_be64((u64)wr->wr.fast_reg.page_list->page_list[i]);
 183         }
 184         *flit_cnt = 5 + wr->wr.fast_reg.page_list_len;
 185         if (*flit_cnt > 15)
 186                 *flit_cnt = 15;
 187         return 0;
 188 }
 189
 190 static int build_inv_stag(union t3_wr *wqe, struct ib_send_wr *wr,
 191                                 u8 *flit_cnt)
 192 {
 193         wqe->local_inv.stag = cpu_to_be32(wr->ex.invalidate_rkey);
 194         wqe->local_inv.reserved = 0;
 195         *flit_cnt = sizeof(struct t3_local_inv_wr) >> 3;
 196         return 0;
 197 }
 198
 199 static int iwch_sgl2pbl_map(struct iwch_dev *rhp, struct ib_sge *sg_list,
 200                             u32 num_sgle, u32 * pbl_addr, u8 * page_size)
 201 {
 202         int i;
 203         struct iwch_mr *mhp;
 204         u64 offset;
 205         for (i = 0; i < num_sgle; i++) {
 206
 207                 mhp = get_mhp(rhp, (sg_list[i].lkey) >> 8);
 208                 if (!mhp) {
 209                         PDBG("%s %d\n", __func__, __LINE__);
 210                         return -EIO;
 211                 }
 212                 if (!mhp->attr.state) {
 213                         PDBG("%s %d\n", __func__, __LINE__);
 214                         return -EIO;
 215                 }
 216                 if (mhp->attr.zbva) {
 217                         PDBG("%s %d\n", __func__, __LINE__);
 218                         return -EIO;
 219                 }
 220
 221                 if (sg_list[i].addr < mhp->attr.va_fbo) {
 222                         PDBG("%s %d\n", __func__, __LINE__);
 223                         return -EINVAL;
 224                 }
 225                 if (sg_list[i].addr + ((u64) sg_list[i].length) <
 226                     sg_list[i].addr) {
 227                         PDBG("%s %d\n", __func__, __LINE__);
 228                         return -EINVAL;
 229                 }
 230                 if (sg_list[i].addr + ((u64) sg_list[i].length) >
 231                     mhp->attr.va_fbo + ((u64) mhp->attr.len)) {
 232                         PDBG("%s %d\n", __func__, __LINE__);
 233                         return -EINVAL;
 234                 }
 235                 offset = sg_list[i].addr - mhp->attr.va_fbo;
 236                 offset += mhp->attr.va_fbo &
 237                           ((1UL << (12 + mhp->attr.page_size)) - 1);
 238                 pbl_addr[i] = ((mhp->attr.pbl_addr -
 239                                 rhp->rdev.rnic_info.pbl_base) >> 3) +
 240                               (offset >> (12 + mhp->attr.page_size));
 241                 page_size[i] = mhp->attr.page_size;
 242         }
 243         return 0;
 244 }
 245
 246 static int build_rdma_recv(struct iwch_qp *qhp, union t3_wr *wqe,
 247                                 struct ib_recv_wr *wr)
 248 {
 249         int i, err = 0;
 250         u32 pbl_addr[T3_MAX_SGE];
 251         u8 page_size[T3_MAX_SGE];
 252
 253         err = iwch_sgl2pbl_map(qhp->rhp, wr->sg_list, wr->num_sge, pbl_addr,
 254                                page_size);
 255         if (err)
 256                 return err;
 257         wqe->recv.pagesz[0] = page_size[0];
 258         wqe->recv.pagesz[1] = page_size[1];
 259         wqe->recv.pagesz[2] = page_size[2];
 260         wqe->recv.pagesz[3] = page_size[3];
 261         wqe->recv.num_sgle = cpu_to_be32(wr->num_sge);
 262         for (i = 0; i < wr->num_sge; i++) {
 263                 wqe->recv.sgl[i].stag = cpu_to_be32(wr->sg_list[i].lkey);
 264                 wqe->recv.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
 265
 266                 /* to in the WQE == the offset into the page */
 267                 wqe->recv.sgl[i].to = cpu_to_be64(((u32)wr->sg_list[i].addr) &
 268                                 ((1UL << (12 + page_size[i])) - 1));
 269
 270                 /* pbl_addr is the adapters address in the PBL */
 271                 wqe->recv.pbl_addr[i] = cpu_to_be32(pbl_addr[i]);
 272         }
 273         for (; i < T3_MAX_SGE; i++) {
 274                 wqe->recv.sgl[i].stag = 0;
 275                 wqe->recv.sgl[i].len = 0;
 276                 wqe->recv.sgl[i].to = 0;
 277                 wqe->recv.pbl_addr[i] = 0;
 278         }
 279         qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
 280                              qhp->wq.rq_size_log2)].wr_id = wr->wr_id;
 281         qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
 282                              qhp->wq.rq_size_log2)].pbl_addr = 0;
 283         return 0;
 284 }
 285
 286 static int build_zero_stag_recv(struct iwch_qp *qhp, union t3_wr *wqe,
 287                                 struct ib_recv_wr *wr)
 288 {
 289         int i;
 290         u32 pbl_addr;
 291         u32 pbl_offset;
 292
 293
 294         /*
 295          * The T3 HW requires the PBL in the HW recv descriptor to reference
 296          * a PBL entry.  So we allocate the max needed PBL memory here and pass
 297          * it to the uP in the recv WR.  The uP will build the PBL and setup
 298          * the HW recv descriptor.
 299          */
 300         pbl_addr = cxio_hal_pblpool_alloc(&qhp->rhp->rdev, T3_STAG0_PBL_SIZE);
 301         if (!pbl_addr)
 302                 return -ENOMEM;
 303
 304         /*
 305          * Compute the 8B aligned offset.
 306          */
 307         pbl_offset = (pbl_addr - qhp->rhp->rdev.rnic_info.pbl_base) >> 3;
 308
 309         wqe->recv.num_sgle = cpu_to_be32(wr->num_sge);
 310
 311         for (i = 0; i < wr->num_sge; i++) {
 312
 313                 /*
 314                  * Use a 128MB page size. This and an imposed 128MB
 315                  * sge length limit allows us to require only a 2-entry HW
 316                  * PBL for each SGE.  This restriction is acceptable since
 317                  * since it is not possible to allocate 128MB of contiguous
 318                  * DMA coherent memory!
 319                  */
 320                 if (wr->sg_list[i].length > T3_STAG0_MAX_PBE_LEN)
 321                         return -EINVAL;
 322                 wqe->recv.pagesz[i] = T3_STAG0_PAGE_SHIFT;
 323
 324                 /*
 325                  * T3 restricts a recv to all zero-stag or all non-zero-stag.
 326                  */
 327                 if (wr->sg_list[i].lkey != 0)
 328                         return -EINVAL;
 329                 wqe->recv.sgl[i].stag = 0;
 330                 wqe->recv.sgl[i].len = cpu_to_be32(wr->sg_list[i].length);
 331                 wqe->recv.sgl[i].to = cpu_to_be64(wr->sg_list[i].addr);
 332                 wqe->recv.pbl_addr[i] = cpu_to_be32(pbl_offset);
 333                 pbl_offset += 2;
 334         }
 335         for (; i < T3_MAX_SGE; i++) {
 336                 wqe->recv.pagesz[i] = 0;
 337                 wqe->recv.sgl[i].stag = 0;
 338                 wqe->recv.sgl[i].len = 0;
 339                 wqe->recv.sgl[i].to = 0;
 340                 wqe->recv.pbl_addr[i] = 0;
 341         }
 342         qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
 343                              qhp->wq.rq_size_log2)].wr_id = wr->wr_id;
 344         qhp->wq.rq[Q_PTR2IDX(qhp->wq.rq_wptr,
 345                              qhp->wq.rq_size_log2)].pbl_addr = pbl_addr;
 346         return 0;
 347 }
 348
 349 int iwch_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 350                       struct ib_send_wr **bad_wr)
 351 {
 352         int err = 0;
 353         u8 uninitialized_var(t3_wr_flit_cnt);
 354         enum t3_wr_opcode t3_wr_opcode = 0;
 355         enum t3_wr_flags t3_wr_flags;
 356         struct iwch_qp *qhp;
 357         u32 idx;
 358         union t3_wr *wqe;
 359         u32 num_wrs;
 360         unsigned long flag;
 361         struct t3_swsq *sqp;
 362         int wr_cnt = 1;
 363
 364         qhp = to_iwch_qp(ibqp);
 365         spin_lock_irqsave(&qhp->lock, flag);
 366         if (qhp->attr.state > IWCH_QP_STATE_RTS) {
 367                 spin_unlock_irqrestore(&qhp->lock, flag);
 368                 err = -EINVAL;
 369                 goto out;
 370         }
 371         num_wrs = Q_FREECNT(qhp->wq.sq_rptr, qhp->wq.sq_wptr,
 372                   qhp->wq.sq_size_log2);
 373         if (num_wrs <= 0) {
 374                 spin_unlock_irqrestore(&qhp->lock, flag);
 375                 err = -ENOMEM;
 376                 goto out;
 377         }
 378         while (wr) {
 379                 if (num_wrs == 0) {
 380                         err = -ENOMEM;
 381                         break;
 382                 }
 383                 idx = Q_PTR2IDX(qhp->wq.wptr, qhp->wq.size_log2);
 384                 wqe = (union t3_wr *) (qhp->wq.queue + idx);
 385                 t3_wr_flags = 0;
 386                 if (wr->send_flags & IB_SEND_SOLICITED)
 387                         t3_wr_flags |= T3_SOLICITED_EVENT_FLAG;
 388                 if (wr->send_flags & IB_SEND_SIGNALED)
 389                         t3_wr_flags |= T3_COMPLETION_FLAG;
 390                 sqp = qhp->wq.sq +
 391                       Q_PTR2IDX(qhp->wq.sq_wptr, qhp->wq.sq_size_log2);
 392                 switch (wr->opcode) {
 393                 case IB_WR_SEND:
 394                 case IB_WR_SEND_WITH_INV:
 395                         if (wr->send_flags & IB_SEND_FENCE)
 396                                 t3_wr_flags |= T3_READ_FENCE_FLAG;
 397                         t3_wr_opcode = T3_WR_SEND;
 398                         err = build_rdma_send(wqe, wr, &t3_wr_flit_cnt);
 399                         break;
 400                 case IB_WR_RDMA_WRITE:
 401                 case IB_WR_RDMA_WRITE_WITH_IMM:
 402                         t3_wr_opcode = T3_WR_WRITE;
 403                         err = build_rdma_write(wqe, wr, &t3_wr_flit_cnt);
 404                         break;
 405                 case IB_WR_RDMA_READ:
 406                 case IB_WR_RDMA_READ_WITH_INV:
 407                         t3_wr_opcode = T3_WR_READ;
 408                         t3_wr_flags = 0; /* T3 reads are always signaled */
 409                         err = build_rdma_read(wqe, wr, &t3_wr_flit_cnt);
 410                         if (err)
 411                                 break;
 412                         sqp->read_len = wqe->read.local_len;
 413                         if (!qhp->wq.oldest_read)
 414                                 qhp->wq.oldest_read = sqp;
 415                         break;
 416                 case IB_WR_FAST_REG_MR:
 417                         t3_wr_opcode = T3_WR_FASTREG;
 418                         err = build_fastreg(wqe, wr, &t3_wr_flit_cnt,
 419                                                  &wr_cnt, &qhp->wq);
 420                         break;
 421                 case IB_WR_LOCAL_INV:
 422                         if (wr->send_flags & IB_SEND_FENCE)
 423                                 t3_wr_flags |= T3_LOCAL_FENCE_FLAG;
 424                         t3_wr_opcode = T3_WR_INV_STAG;
 425                         err = build_inv_stag(wqe, wr, &t3_wr_flit_cnt);
 426                         break;
 427                 default:
 428                         PDBG("%s post of type=%d TBD!\n", __func__,
 429                              wr->opcode);
 430                         err = -EINVAL;
 431                 }
 432                 if (err)
 433                         break;
 434                 wqe->send.wrid.id0.hi = qhp->wq.sq_wptr;
 435                 sqp->wr_id = wr->wr_id;
 436                 sqp->opcode = wr2opcode(t3_wr_opcode);
 437                 sqp->sq_wptr = qhp->wq.sq_wptr;
 438                 sqp->complete = 0;
 439                 sqp->signaled = (wr->send_flags & IB_SEND_SIGNALED);
 440
 441                 build_fw_riwrh((void *) wqe, t3_wr_opcode, t3_wr_flags,
 442                                Q_GENBIT(qhp->wq.wptr, qhp->wq.size_log2),
 443                                0, t3_wr_flit_cnt,
 444                                (wr_cnt == 1) ? T3_SOPEOP : T3_SOP);
 445                 PDBG("%s cookie 0x%llx wq idx 0x%x swsq idx %ld opcode %d\n",
 446                      __func__, (unsigned long long) wr->wr_id, idx,
 447                      Q_PTR2IDX(qhp->wq.sq_wptr, qhp->wq.sq_size_log2),
 448                      sqp->opcode);
 449                 wr = wr->next;
 450                 num_wrs--;
 451                 qhp->wq.wptr += wr_cnt;
 452                 ++(qhp->wq.sq_wptr);
 453         }
 454         spin_unlock_irqrestore(&qhp->lock, flag);
 455         if (cxio_wq_db_enabled(&qhp->wq))
 456                 ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
 457
 458 out:
 459         if (err)
 460                 *bad_wr = wr;
 461         return err;
 462 }
 463
 464 int iwch_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 465                       struct ib_recv_wr **bad_wr)
 466 {
 467         int err = 0;
 468         struct iwch_qp *qhp;
 469         u32 idx;
 470         union t3_wr *wqe;
 471         u32 num_wrs;
 472         unsigned long flag;
 473
 474         qhp = to_iwch_qp(ibqp);
 475         spin_lock_irqsave(&qhp->lock, flag);
 476         if (qhp->attr.state > IWCH_QP_STATE_RTS) {
 477                 spin_unlock_irqrestore(&qhp->lock, flag);
 478                 err = -EINVAL;
 479                 goto out;
 480         }
 481         num_wrs = Q_FREECNT(qhp->wq.rq_rptr, qhp->wq.rq_wptr,
 482                             qhp->wq.rq_size_log2) - 1;
 483         if (!wr) {
 484                 spin_unlock_irqrestore(&qhp->lock, flag);
 485                 err = -ENOMEM;
 486                 goto out;
 487         }
 488         while (wr) {
 489                 if (wr->num_sge > T3_MAX_SGE) {
 490                         err = -EINVAL;
 491                         break;
 492                 }
 493                 idx = Q_PTR2IDX(qhp->wq.wptr, qhp->wq.size_log2);
 494                 wqe = (union t3_wr *) (qhp->wq.queue + idx);
 495                 if (num_wrs)
 496                         if (wr->sg_list[0].lkey)
 497                                 err = build_rdma_recv(qhp, wqe, wr);
 498                         else
 499                                 err = build_zero_stag_recv(qhp, wqe, wr);
 500                 else
 501                         err = -ENOMEM;
 502
 503                 if (err)
 504                         break;
 505
 506                 build_fw_riwrh((void *) wqe, T3_WR_RCV, T3_COMPLETION_FLAG,
 507                                Q_GENBIT(qhp->wq.wptr, qhp->wq.size_log2),
 508                                0, sizeof(struct t3_receive_wr) >> 3, T3_SOPEOP);
 509                 PDBG("%s cookie 0x%llx idx 0x%x rq_wptr 0x%x rw_rptr 0x%x "
 510                      "wqe %p \n", __func__, (unsigned long long) wr->wr_id,
 511                      idx, qhp->wq.rq_wptr, qhp->wq.rq_rptr, wqe);
 512                 ++(qhp->wq.rq_wptr);
 513                 ++(qhp->wq.wptr);
 514                 wr = wr->next;
 515                 num_wrs--;
 516         }
 517         spin_unlock_irqrestore(&qhp->lock, flag);
 518         if (cxio_wq_db_enabled(&qhp->wq))
 519                 ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
 520
 521 out:
 522         if (err)
 523                 *bad_wr = wr;
 524         return err;
 525 }
 526
 527 int iwch_bind_mw(struct ib_qp *qp,
 528                              struct ib_mw *mw,
 529                              struct ib_mw_bind *mw_bind)
 530 {
 531         struct iwch_dev *rhp;
 532         struct iwch_mw *mhp;
 533         struct iwch_qp *qhp;
 534         union t3_wr *wqe;
 535         u32 pbl_addr;
 536         u8 page_size;
 537         u32 num_wrs;
 538         unsigned long flag;
 539         struct ib_sge sgl;
 540         int err=0;
 541         enum t3_wr_flags t3_wr_flags;
 542         u32 idx;
 543         struct t3_swsq *sqp;
 544
 545         qhp = to_iwch_qp(qp);
 546         mhp = to_iwch_mw(mw);
 547         rhp = qhp->rhp;
 548
 549         spin_lock_irqsave(&qhp->lock, flag);
 550         if (qhp->attr.state > IWCH_QP_STATE_RTS) {
 551                 spin_unlock_irqrestore(&qhp->lock, flag);
 552                 return -EINVAL;
 553         }
 554         num_wrs = Q_FREECNT(qhp->wq.sq_rptr, qhp->wq.sq_wptr,
 555                             qhp->wq.sq_size_log2);
 556         if ((num_wrs) <= 0) {
 557                 spin_unlock_irqrestore(&qhp->lock, flag);
 558                 return -ENOMEM;
 559         }
 560         idx = Q_PTR2IDX(qhp->wq.wptr, qhp->wq.size_log2);
 561         PDBG("%s: idx 0x%0x, mw 0x%p, mw_bind 0x%p\n", __func__, idx,
 562              mw, mw_bind);
 563         wqe = (union t3_wr *) (qhp->wq.queue + idx);
 564
 565         t3_wr_flags = 0;
 566         if (mw_bind->send_flags & IB_SEND_SIGNALED)
 567                 t3_wr_flags = T3_COMPLETION_FLAG;
 568
 569         sgl.addr = mw_bind->addr;
 570         sgl.lkey = mw_bind->mr->lkey;
 571         sgl.length = mw_bind->length;
 572         wqe->bind.reserved = 0;
 573         wqe->bind.type = TPT_VATO;
 574
 575         /* TBD: check perms */
 576         wqe->bind.perms = iwch_ib_to_tpt_bind_access(mw_bind->mw_access_flags);
 577         wqe->bind.mr_stag = cpu_to_be32(mw_bind->mr->lkey);
 578         wqe->bind.mw_stag = cpu_to_be32(mw->rkey);
 579         wqe->bind.mw_len = cpu_to_be32(mw_bind->length);
 580         wqe->bind.mw_va = cpu_to_be64(mw_bind->addr);
 581         err = iwch_sgl2pbl_map(rhp, &sgl, 1, &pbl_addr, &page_size);
 582         if (err) {
 583                 spin_unlock_irqrestore(&qhp->lock, flag);
 584                 return err;
 585         }
 586         wqe->send.wrid.id0.hi = qhp->wq.sq_wptr;
 587         sqp = qhp->wq.sq + Q_PTR2IDX(qhp->wq.sq_wptr, qhp->wq.sq_size_log2);
 588         sqp->wr_id = mw_bind->wr_id;
 589         sqp->opcode = T3_BIND_MW;
 590         sqp->sq_wptr = qhp->wq.sq_wptr;
 591         sqp->complete = 0;
 592         sqp->signaled = (mw_bind->send_flags & IB_SEND_SIGNALED);
 593         wqe->bind.mr_pbl_addr = cpu_to_be32(pbl_addr);
 594         wqe->bind.mr_pagesz = page_size;
 595         build_fw_riwrh((void *)wqe, T3_WR_BIND, t3_wr_flags,
 596                        Q_GENBIT(qhp->wq.wptr, qhp->wq.size_log2), 0,
 597                        sizeof(struct t3_bind_mw_wr) >> 3, T3_SOPEOP);
 598         ++(qhp->wq.wptr);
 599         ++(qhp->wq.sq_wptr);
 600         spin_unlock_irqrestore(&qhp->lock, flag);
 601
 602         if (cxio_wq_db_enabled(&qhp->wq))
 603                 ring_doorbell(qhp->wq.doorbell, qhp->wq.qpid);
 604
 605         return err;
 606 }
 607
 608 static inline void build_term_codes(struct respQ_msg_t *rsp_msg,
 609                                     u8 *layer_type, u8 *ecode)
 610 {
 611         int status = TPT_ERR_INTERNAL_ERR;
 612         int tagged = 0;
 613         int opcode = -1;
 614         int rqtype = 0;
 615         int send_inv = 0;
 616
 617         if (rsp_msg) {
 618                 status = CQE_STATUS(rsp_msg->cqe);
 619                 opcode = CQE_OPCODE(rsp_msg->cqe);
 620                 rqtype = RQ_TYPE(rsp_msg->cqe);
 621                 send_inv = (opcode == T3_SEND_WITH_INV) ||
 622                            (opcode == T3_SEND_WITH_SE_INV);
 623                 tagged = (opcode == T3_RDMA_WRITE) ||
 624                          (rqtype && (opcode == T3_READ_RESP));
 625         }
 626
 627         switch (status) {
 628         case TPT_ERR_STAG:
 629                 if (send_inv) {
 630                         *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
 631                         *ecode = RDMAP_CANT_INV_STAG;
 632                 } else {
 633                         *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
 634                         *ecode = RDMAP_INV_STAG;
 635                 }
 636                 break;
 637         case TPT_ERR_PDID:
 638                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
 639                 if ((opcode == T3_SEND_WITH_INV) ||
 640                     (opcode == T3_SEND_WITH_SE_INV))
 641                         *ecode = RDMAP_CANT_INV_STAG;
 642                 else
 643                         *ecode = RDMAP_STAG_NOT_ASSOC;
 644                 break;
 645         case TPT_ERR_QPID:
 646                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
 647                 *ecode = RDMAP_STAG_NOT_ASSOC;
 648                 break;
 649         case TPT_ERR_ACCESS:
 650                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
 651                 *ecode = RDMAP_ACC_VIOL;
 652                 break;
 653         case TPT_ERR_WRAP:
 654                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
 655                 *ecode = RDMAP_TO_WRAP;
 656                 break;
 657         case TPT_ERR_BOUND:
 658                 if (tagged) {
 659                         *layer_type = LAYER_DDP|DDP_TAGGED_ERR;
 660                         *ecode = DDPT_BASE_BOUNDS;
 661                 } else {
 662                         *layer_type = LAYER_RDMAP|RDMAP_REMOTE_PROT;
 663                         *ecode = RDMAP_BASE_BOUNDS;
 664                 }
 665                 break;
 666         case TPT_ERR_INVALIDATE_SHARED_MR:
 667         case TPT_ERR_INVALIDATE_MR_WITH_MW_BOUND:
 668                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
 669                 *ecode = RDMAP_CANT_INV_STAG;
 670                 break;
 671         case TPT_ERR_ECC:
 672         case TPT_ERR_ECC_PSTAG:
 673         case TPT_ERR_INTERNAL_ERR:
 674                 *layer_type = LAYER_RDMAP|RDMAP_LOCAL_CATA;
 675                 *ecode = 0;
 676                 break;
 677         case TPT_ERR_OUT_OF_RQE:
 678                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
 679                 *ecode = DDPU_INV_MSN_NOBUF;
 680                 break;
 681         case TPT_ERR_PBL_ADDR_BOUND:
 682                 *layer_type = LAYER_DDP|DDP_TAGGED_ERR;
 683                 *ecode = DDPT_BASE_BOUNDS;
 684                 break;
 685         case TPT_ERR_CRC:
 686                 *layer_type = LAYER_MPA|DDP_LLP;
 687                 *ecode = MPA_CRC_ERR;
 688                 break;
 689         case TPT_ERR_MARKER:
 690                 *layer_type = LAYER_MPA|DDP_LLP;
 691                 *ecode = MPA_MARKER_ERR;
 692                 break;
 693         case TPT_ERR_PDU_LEN_ERR:
 694                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
 695                 *ecode = DDPU_MSG_TOOBIG;
 696                 break;
 697         case TPT_ERR_DDP_VERSION:
 698                 if (tagged) {
 699                         *layer_type = LAYER_DDP|DDP_TAGGED_ERR;
 700                         *ecode = DDPT_INV_VERS;
 701                 } else {
 702                         *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
 703                         *ecode = DDPU_INV_VERS;
 704                 }
 705                 break;
 706         case TPT_ERR_RDMA_VERSION:
 707                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
 708                 *ecode = RDMAP_INV_VERS;
 709                 break;
 710         case TPT_ERR_OPCODE:
 711                 *layer_type = LAYER_RDMAP|RDMAP_REMOTE_OP;
 712                 *ecode = RDMAP_INV_OPCODE;
 713                 break;
 714         case TPT_ERR_DDP_QUEUE_NUM:
 715                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
 716                 *ecode = DDPU_INV_QN;
 717                 break;
 718         case TPT_ERR_MSN:
 719         case TPT_ERR_MSN_GAP:
 720         case TPT_ERR_MSN_RANGE:
 721         case TPT_ERR_IRD_OVERFLOW:
 722                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
 723                 *ecode = DDPU_INV_MSN_RANGE;
 724                 break;
 725         case TPT_ERR_TBIT:
 726                 *layer_type = LAYER_DDP|DDP_LOCAL_CATA;
 727                 *ecode = 0;
 728                 break;
 729         case TPT_ERR_MO:
 730                 *layer_type = LAYER_DDP|DDP_UNTAGGED_ERR;
 731                 *ecode = DDPU_INV_MO;
 732                 break;
 733         default:
 734                 *layer_type = LAYER_RDMAP|DDP_LOCAL_CATA;
 735                 *ecode = 0;
 736                 break;
 737         }
 738 }
 739
 740 int iwch_post_zb_read(struct iwch_qp *qhp)
 741 {
 742         union t3_wr *wqe;
 743         struct sk_buff *skb;
 744         u8 flit_cnt = sizeof(struct t3_rdma_read_wr) >> 3;
 745
 746         PDBG("%s enter\n", __func__);
 747         skb = alloc_skb(40, GFP_KERNEL);
 748         if (!skb) {
 749                 printk(KERN_ERR "%s cannot send zb_read!!\n", __func__);
 750                 return -ENOMEM;
 751         }
 752         wqe = (union t3_wr *)skb_put(skb, sizeof(struct t3_rdma_read_wr));
 753         memset(wqe, 0, sizeof(struct t3_rdma_read_wr));
 754         wqe->read.rdmaop = T3_READ_REQ;
 755         wqe->read.reserved[0] = 0;
 756         wqe->read.reserved[1] = 0;
 757         wqe->read.rem_stag = cpu_to_be32(1);
 758         wqe->read.rem_to = cpu_to_be64(1);
 759         wqe->read.local_stag = cpu_to_be32(1);
 760         wqe->read.local_len = cpu_to_be32(0);
 761         wqe->read.local_to = cpu_to_be64(1);
 762         wqe->send.wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_READ));
 763         wqe->send.wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(qhp->ep->hwtid)|
 764                                                 V_FW_RIWR_LEN(flit_cnt));
 765         skb->priority = CPL_PRIORITY_DATA;
 766         return iwch_cxgb3_ofld_send(qhp->rhp->rdev.t3cdev_p, skb);
 767 }
 768
 769 /*
 770  * This posts a TERMINATE with layer=RDMA, type=catastrophic.
 771  */
 772 int iwch_post_terminate(struct iwch_qp *qhp, struct respQ_msg_t *rsp_msg)
 773 {
 774         union t3_wr *wqe;
 775         struct terminate_message *term;
 776         struct sk_buff *skb;
 777
 778         PDBG("%s %d\n", __func__, __LINE__);
 779         skb = alloc_skb(40, GFP_ATOMIC);
 780         if (!skb) {
 781                 printk(KERN_ERR "%s cannot send TERMINATE!\n", __func__);
 782                 return -ENOMEM;
 783         }
 784         wqe = (union t3_wr *)skb_put(skb, 40);
 785         memset(wqe, 0, 40);
 786         wqe->send.rdmaop = T3_TERMINATE;
 787
 788         /* immediate data length */
 789         wqe->send.plen = htonl(4);
 790
 791         /* immediate data starts here. */
 792         term = (struct terminate_message *)wqe->send.sgl;
 793         build_term_codes(rsp_msg, &term->layer_etype, &term->ecode);
 794         wqe->send.wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_SEND) |
 795                          V_FW_RIWR_FLAGS(T3_COMPLETION_FLAG | T3_NOTIFY_FLAG));
 796         wqe->send.wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(qhp->ep->hwtid));
 797         skb->priority = CPL_PRIORITY_DATA;
 798         return iwch_cxgb3_ofld_send(qhp->rhp->rdev.t3cdev_p, skb);
 799 }
 800
 801 /*
 802  * Assumes qhp lock is held.
 803  */
 804 static void __flush_qp(struct iwch_qp *qhp, unsigned long *flag)
 805 {
 806         struct iwch_cq *rchp, *schp;
 807         int count;
 808         int flushed;
 809
 810         rchp = get_chp(qhp->rhp, qhp->attr.rcq);
 811         schp = get_chp(qhp->rhp, qhp->attr.scq);
 812
 813         PDBG("%s qhp %p rchp %p schp %p\n", __func__, qhp, rchp, schp);
 814         /* take a ref on the qhp since we must release the lock */
 815         atomic_inc(&qhp->refcnt);
 816         spin_unlock_irqrestore(&qhp->lock, *flag);
 817
 818         /* locking heirarchy: cq lock first, then qp lock. */
 819         spin_lock_irqsave(&rchp->lock, *flag);
 820         spin_lock(&qhp->lock);
 821         cxio_flush_hw_cq(&rchp->cq);
 822         cxio_count_rcqes(&rchp->cq, &qhp->wq, &count);
 823         flushed = cxio_flush_rq(&qhp->wq, &rchp->cq, count);
 824         spin_unlock(&qhp->lock);
 825         spin_unlock_irqrestore(&rchp->lock, *flag);
 826         if (flushed)
 827                 (*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
 828
 829         /* locking heirarchy: cq lock first, then qp lock. */
 830         spin_lock_irqsave(&schp->lock, *flag);
 831         spin_lock(&qhp->lock);
 832         cxio_flush_hw_cq(&schp->cq);
 833         cxio_count_scqes(&schp->cq, &qhp->wq, &count);
 834         flushed = cxio_flush_sq(&qhp->wq, &schp->cq, count);
 835         spin_unlock(&qhp->lock);
 836         spin_unlock_irqrestore(&schp->lock, *flag);
 837         if (flushed)
 838                 (*schp->ibcq.comp_handler)(&schp->ibcq, schp->ibcq.cq_context);
 839
 840         /* deref */
 841         if (atomic_dec_and_test(&qhp->refcnt))
 842                 wake_up(&qhp->wait);
 843
 844         spin_lock_irqsave(&qhp->lock, *flag);
 845 }
 846
 847 static void flush_qp(struct iwch_qp *qhp, unsigned long *flag)
 848 {
 849         if (qhp->ibqp.uobject)
 850                 cxio_set_wq_in_error(&qhp->wq);
 851         else
 852                 __flush_qp(qhp, flag);
 853 }
 854
 855
 856 /*
 857  * Return count of RECV WRs posted
 858  */
 859 u16 iwch_rqes_posted(struct iwch_qp *qhp)
 860 {
 861         union t3_wr *wqe = qhp->wq.queue;
 862         u16 count = 0;
 863         while ((count+1) != 0 && fw_riwrh_opcode((struct fw_riwrh *)wqe) == T3_WR_RCV) {
 864                 count++;
 865                 wqe++;
 866         }
 867         PDBG("%s qhp %p count %u\n", __func__, qhp, count);
 868         return count;
 869 }
 870
 871 static int rdma_init(struct iwch_dev *rhp, struct iwch_qp *qhp,
 872                                 enum iwch_qp_attr_mask mask,
 873                                 struct iwch_qp_attributes *attrs)
 874 {
 875         struct t3_rdma_init_attr init_attr;
 876         int ret;
 877
 878         init_attr.tid = qhp->ep->hwtid;
 879         init_attr.qpid = qhp->wq.qpid;
 880         init_attr.pdid = qhp->attr.pd;
 881         init_attr.scqid = qhp->attr.scq;
 882         init_attr.rcqid = qhp->attr.rcq;
 883         init_attr.rq_addr = qhp->wq.rq_addr;
 884         init_attr.rq_size = 1 << qhp->wq.rq_size_log2;
 885         init_attr.mpaattrs = uP_RI_MPA_IETF_ENABLE |
 886                 qhp->attr.mpa_attr.recv_marker_enabled |
 887                 (qhp->attr.mpa_attr.xmit_marker_enabled << 1) |
 888                 (qhp->attr.mpa_attr.crc_enabled << 2);
 889
 890         init_attr.qpcaps = uP_RI_QP_RDMA_READ_ENABLE |
 891                            uP_RI_QP_RDMA_WRITE_ENABLE |
 892                            uP_RI_QP_BIND_ENABLE;
 893         if (!qhp->ibqp.uobject)
 894                 init_attr.qpcaps |= uP_RI_QP_STAG0_ENABLE |
 895                                     uP_RI_QP_FAST_REGISTER_ENABLE;
 896
 897         init_attr.tcp_emss = qhp->ep->emss;
 898         init_attr.ord = qhp->attr.max_ord;
 899         init_attr.ird = qhp->attr.max_ird;
 900         init_attr.qp_dma_addr = qhp->wq.dma_addr;
 901         init_attr.qp_dma_size = (1UL << qhp->wq.size_log2);
 902         init_attr.rqe_count = iwch_rqes_posted(qhp);
 903         init_attr.flags = qhp->attr.mpa_attr.initiator ? MPA_INITIATOR : 0;
 904         init_attr.chan = qhp->ep->l2t->smt_idx;
 905         if (peer2peer) {
 906                 init_attr.rtr_type = RTR_READ;
 907                 if (init_attr.ord == 0 && qhp->attr.mpa_attr.initiator)
 908                         init_attr.ord = 1;
 909                 if (init_attr.ird == 0 && !qhp->attr.mpa_attr.initiator)
 910                         init_attr.ird = 1;
 911         } else
 912                 init_attr.rtr_type = 0;
 913         init_attr.irs = qhp->ep->rcv_seq;
 914         PDBG("%s init_attr.rq_addr 0x%x init_attr.rq_size = %d "
 915              "flags 0x%x qpcaps 0x%x\n", __func__,
 916              init_attr.rq_addr, init_attr.rq_size,
 917              init_attr.flags, init_attr.qpcaps);
 918         ret = cxio_rdma_init(&rhp->rdev, &init_attr);
 919         PDBG("%s ret %d\n", __func__, ret);
 920         return ret;
 921 }
 922
 923 int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
 924                                 enum iwch_qp_attr_mask mask,
 925                                 struct iwch_qp_attributes *attrs,
 926                                 int internal)
 927 {
 928         int ret = 0;
 929         struct iwch_qp_attributes newattr = qhp->attr;
 930         unsigned long flag;
 931         int disconnect = 0;
 932         int terminate = 0;
 933         int abort = 0;
 934         int free = 0;
 935         struct iwch_ep *ep = NULL;
 936
 937         PDBG("%s qhp %p qpid 0x%x ep %p state %d -> %d\n", __func__,
 938              qhp, qhp->wq.qpid, qhp->ep, qhp->attr.state,
 939              (mask & IWCH_QP_ATTR_NEXT_STATE) ? attrs->next_state : -1);
 940
 941         spin_lock_irqsave(&qhp->lock, flag);
 942
 943         /* Process attr changes if in IDLE */
 944         if (mask & IWCH_QP_ATTR_VALID_MODIFY) {
 945                 if (qhp->attr.state != IWCH_QP_STATE_IDLE) {
 946                         ret = -EIO;
 947                         goto out;
 948                 }
 949                 if (mask & IWCH_QP_ATTR_ENABLE_RDMA_READ)
 950                         newattr.enable_rdma_read = attrs->enable_rdma_read;
 951                 if (mask & IWCH_QP_ATTR_ENABLE_RDMA_WRITE)
 952                         newattr.enable_rdma_write = attrs->enable_rdma_write;
 953                 if (mask & IWCH_QP_ATTR_ENABLE_RDMA_BIND)
 954                         newattr.enable_bind = attrs->enable_bind;
 955                 if (mask & IWCH_QP_ATTR_MAX_ORD) {
 956                         if (attrs->max_ord >
 957                             rhp->attr.max_rdma_read_qp_depth) {
 958                                 ret = -EINVAL;
 959                                 goto out;
 960                         }
 961                         newattr.max_ord = attrs->max_ord;
 962                 }
 963                 if (mask & IWCH_QP_ATTR_MAX_IRD) {
 964                         if (attrs->max_ird >
 965                             rhp->attr.max_rdma_reads_per_qp) {
 966                                 ret = -EINVAL;
 967                                 goto out;
 968                         }
 969                         newattr.max_ird = attrs->max_ird;
 970                 }
 971                 qhp->attr = newattr;
 972         }
 973
 974         if (!(mask & IWCH_QP_ATTR_NEXT_STATE))
 975                 goto out;
 976         if (qhp->attr.state == attrs->next_state)
 977                 goto out;
 978
 979         switch (qhp->attr.state) {
 980         case IWCH_QP_STATE_IDLE:
 981                 switch (attrs->next_state) {
 982                 case IWCH_QP_STATE_RTS:
 983                         if (!(mask & IWCH_QP_ATTR_LLP_STREAM_HANDLE)) {
 984                                 ret = -EINVAL;
 985                                 goto out;
 986                         }
 987                         if (!(mask & IWCH_QP_ATTR_MPA_ATTR)) {
 988                                 ret = -EINVAL;
 989                                 goto out;
 990                         }
 991                         qhp->attr.mpa_attr = attrs->mpa_attr;
 992                         qhp->attr.llp_stream_handle = attrs->llp_stream_handle;
 993                         qhp->ep = qhp->attr.llp_stream_handle;
 994                         qhp->attr.state = IWCH_QP_STATE_RTS;
 995
 996                         /*
 997                          * Ref the endpoint here and deref when we
 998                          * disassociate the endpoint from the QP.  This
 999                          * happens in CLOSING->IDLE transition or *->ERROR
1000                          * transition.
1001                          */
1002                         get_ep(&qhp->ep->com);
1003                         spin_unlock_irqrestore(&qhp->lock, flag);
1004                         ret = rdma_init(rhp, qhp, mask, attrs);
1005                         spin_lock_irqsave(&qhp->lock, flag);
1006                         if (ret)
1007                                 goto err;
1008                         break;
1009                 case IWCH_QP_STATE_ERROR:
1010                         qhp->attr.state = IWCH_QP_STATE_ERROR;
1011                         flush_qp(qhp, &flag);
1012                         break;
1013                 default:
1014                         ret = -EINVAL;
1015                         goto out;
1016                 }
1017                 break;
1018         case IWCH_QP_STATE_RTS:
1019                 switch (attrs->next_state) {
1020                 case IWCH_QP_STATE_CLOSING:
1021                         BUG_ON(atomic_read(&qhp->ep->com.kref.refcount) < 2);
1022                         qhp->attr.state = IWCH_QP_STATE_CLOSING;
1023                         if (!internal) {
1024                                 abort=0;
1025                                 disconnect = 1;
1026                                 ep = qhp->ep;
1027                                 get_ep(&ep->com);
1028                         }
1029                         break;
1030                 case IWCH_QP_STATE_TERMINATE:
1031                         qhp->attr.state = IWCH_QP_STATE_TERMINATE;
1032                         if (qhp->ibqp.uobject)
1033                                 cxio_set_wq_in_error(&qhp->wq);
1034                         if (!internal)
1035                                 terminate = 1;
1036                         break;
1037                 case IWCH_QP_STATE_ERROR:
1038                         qhp->attr.state = IWCH_QP_STATE_ERROR;
1039                         if (!internal) {
1040                                 abort=1;
1041                                 disconnect = 1;
1042                                 ep = qhp->ep;
1043                                 get_ep(&ep->com);
1044                         }
1045                         goto err;
1046                         break;
1047                 default:
1048                         ret = -EINVAL;
1049                         goto out;
1050                 }
1051                 break;
1052         case IWCH_QP_STATE_CLOSING:
1053                 if (!internal) {
1054                         ret = -EINVAL;
1055                         goto out;
1056                 }
1057                 switch (attrs->next_state) {
1058                         case IWCH_QP_STATE_IDLE:
1059                                 flush_qp(qhp, &flag);
1060                                 qhp->attr.state = IWCH_QP_STATE_IDLE;
1061                                 qhp->attr.llp_stream_handle = NULL;
1062                                 put_ep(&qhp->ep->com);
1063                                 qhp->ep = NULL;
1064                                 wake_up(&qhp->wait);
1065                                 break;
1066                         case IWCH_QP_STATE_ERROR:
1067                                 goto err;
1068                         default:
1069                                 ret = -EINVAL;
1070                                 goto err;
1071                 }
1072                 break;
1073         case IWCH_QP_STATE_ERROR:
1074                 if (attrs->next_state != IWCH_QP_STATE_IDLE) {
1075                         ret = -EINVAL;
1076                         goto out;
1077                 }
1078
1079                 if (!Q_EMPTY(qhp->wq.sq_rptr, qhp->wq.sq_wptr) ||
1080                     !Q_EMPTY(qhp->wq.rq_rptr, qhp->wq.rq_wptr)) {
1081                         ret = -EINVAL;
1082                         goto out;
1083                 }
1084                 qhp->attr.state = IWCH_QP_STATE_IDLE;
1085                 break;
1086         case IWCH_QP_STATE_TERMINATE:
1087                 if (!internal) {
1088                         ret = -EINVAL;
1089                         goto out;
1090                 }
1091                 goto err;
1092                 break;
1093         default:
1094                 printk(KERN_ERR "%s in a bad state %d\n",
1095                        __func__, qhp->attr.state);
1096                 ret = -EINVAL;
1097                 goto err;
1098                 break;
1099         }
1100         goto out;
1101 err:
1102         PDBG("%s disassociating ep %p qpid 0x%x\n", __func__, qhp->ep,
1103              qhp->wq.qpid);
1104
1105         /* disassociate the LLP connection */
1106         qhp->attr.llp_stream_handle = NULL;
1107         ep = qhp->ep;
1108         qhp->ep = NULL;
1109         qhp->attr.state = IWCH_QP_STATE_ERROR;
1110         free=1;
1111         wake_up(&qhp->wait);
1112         BUG_ON(!ep);
1113         flush_qp(qhp, &flag);
1114 out:
1115         spin_unlock_irqrestore(&qhp->lock, flag);
1116
1117         if (terminate)
1118                 iwch_post_terminate(qhp, NULL);
1119
1120         /*
1121          * If disconnect is 1, then we need to initiate a disconnect
1122          * on the EP.  This can be a normal close (RTS->CLOSING) or
1123          * an abnormal close (RTS/CLOSING->ERROR).
1124          */
1125         if (disconnect) {
1126                 iwch_ep_disconnect(ep, abort, GFP_KERNEL);
1127                 put_ep(&ep->com);
1128         }
1129
1130         /*
1131          * If free is 1, then we've disassociated the EP from the QP
1132          * and we need to dereference the EP.
1133          */
1134         if (free)
1135                 put_ep(&ep->com);
1136
1137         PDBG("%s exit state %d\n", __func__, qhp->attr.state);
1138         return ret;
1139 }
1140
1141 static int quiesce_qp(struct iwch_qp *qhp)
1142 {
1143         spin_lock_irq(&qhp->lock);
1144         iwch_quiesce_tid(qhp->ep);
1145         qhp->flags |= QP_QUIESCED;
1146         spin_unlock_irq(&qhp->lock);
1147         return 0;
1148 }
1149
1150 static int resume_qp(struct iwch_qp *qhp)
1151 {
1152         spin_lock_irq(&qhp->lock);
1153         iwch_resume_tid(qhp->ep);
1154         qhp->flags &= ~QP_QUIESCED;
1155         spin_unlock_irq(&qhp->lock);
1156         return 0;
1157 }
1158
1159 int iwch_quiesce_qps(struct iwch_cq *chp)
1160 {
1161         int i;
1162         struct iwch_qp *qhp;
1163
1164         for (i=0; i < T3_MAX_NUM_QP; i++) {
1165                 qhp = get_qhp(chp->rhp, i);
1166                 if (!qhp)
1167                         continue;
1168                 if ((qhp->attr.rcq == chp->cq.cqid) && !qp_quiesced(qhp)) {
1169                         quiesce_qp(qhp);
1170                         continue;
1171                 }
1172                 if ((qhp->attr.scq == chp->cq.cqid) && !qp_quiesced(qhp))
1173                         quiesce_qp(qhp);
1174         }
1175         return 0;
1176 }
1177
1178 int iwch_resume_qps(struct iwch_cq *chp)
1179 {
1180         int i;
1181         struct iwch_qp *qhp;
1182
1183         for (i=0; i < T3_MAX_NUM_QP; i++) {
1184                 qhp = get_qhp(chp->rhp, i);
1185                 if (!qhp)
1186                         continue;
1187                 if ((qhp->attr.rcq == chp->cq.cqid) && qp_quiesced(qhp)) {
1188                         resume_qp(qhp);
1189                         continue;
1190                 }
1191                 if ((qhp->attr.scq == chp->cq.cqid) && qp_quiesced(qhp))
1192                         resume_qp(qhp);
1193         }
1194         return 0;
1195 }