contrib/ofed/libmlx4/srq.c

   1 /*
   2  * Copyright (c) 2007 Cisco, 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 <config.h>
  34
  35 #include <stdlib.h>
  36 #include <pthread.h>
  37 #include <string.h>
  38
  39 #include "mlx4.h"
  40 #include "doorbell.h"
  41 #include "wqe.h"
  42 #include "mlx4-abi.h"
  43
  44 static void *get_wqe(struct mlx4_srq *srq, int n)
  45 {
  46         return srq->buf.buf + (n << srq->wqe_shift);
  47 }
  48
  49 void mlx4_free_srq_wqe(struct mlx4_srq *srq, int ind)
  50 {
  51         struct mlx4_wqe_srq_next_seg *next;
  52
  53         pthread_spin_lock(&srq->lock);
  54
  55         next = get_wqe(srq, srq->tail);
  56         next->next_wqe_index = htobe16(ind);
  57         srq->tail = ind;
  58
  59         pthread_spin_unlock(&srq->lock);
  60 }
  61
  62 int mlx4_post_srq_recv(struct ibv_srq *ibsrq,
  63                        struct ibv_recv_wr *wr,
  64                        struct ibv_recv_wr **bad_wr)
  65 {
  66         struct mlx4_srq *srq = to_msrq(ibsrq);
  67         struct mlx4_wqe_srq_next_seg *next;
  68         struct mlx4_wqe_data_seg *scat;
  69         int err = 0;
  70         int nreq;
  71         int i;
  72
  73         pthread_spin_lock(&srq->lock);
  74
  75         for (nreq = 0; wr; ++nreq, wr = wr->next) {
  76                 if (wr->num_sge > srq->max_gs) {
  77                         err = -1;
  78                         *bad_wr = wr;
  79                         break;
  80                 }
  81
  82                 if (srq->head == srq->tail) {
  83                         /* SRQ is full*/
  84                         err = -1;
  85                         *bad_wr = wr;
  86                         break;
  87                 }
  88
  89                 srq->wrid[srq->head] = wr->wr_id;
  90
  91                 next      = get_wqe(srq, srq->head);
  92                 srq->head = be16toh(next->next_wqe_index);
  93                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
  94
  95                 for (i = 0; i < wr->num_sge; ++i) {
  96                         scat[i].byte_count = htobe32(wr->sg_list[i].length);
  97                         scat[i].lkey       = htobe32(wr->sg_list[i].lkey);
  98                         scat[i].addr       = htobe64(wr->sg_list[i].addr);
  99                 }
 100
 101                 if (i < srq->max_gs) {
 102                         scat[i].byte_count = 0;
 103                         scat[i].lkey       = htobe32(MLX4_INVALID_LKEY);
 104                         scat[i].addr       = 0;
 105                 }
 106         }
 107
 108         if (nreq) {
 109                 srq->counter += nreq;
 110
 111                 /*
 112                  * Make sure that descriptors are written before
 113                  * we write doorbell record.
 114                  */
 115                 udma_to_device_barrier();
 116
 117                 *srq->db = htobe32(srq->counter);
 118         }
 119
 120         pthread_spin_unlock(&srq->lock);
 121
 122         return err;
 123 }
 124
 125 int mlx4_alloc_srq_buf(struct ibv_pd *pd, struct ibv_srq_attr *attr,
 126                        struct mlx4_srq *srq)
 127 {
 128         struct mlx4_wqe_srq_next_seg *next;
 129         struct mlx4_wqe_data_seg *scatter;
 130         int size;
 131         int buf_size;
 132         int i;
 133
 134         srq->wrid = malloc(srq->max * sizeof (uint64_t));
 135         if (!srq->wrid)
 136                 return -1;
 137
 138         size = sizeof (struct mlx4_wqe_srq_next_seg) +
 139                 srq->max_gs * sizeof (struct mlx4_wqe_data_seg);
 140
 141         for (srq->wqe_shift = 5; 1 << srq->wqe_shift < size; ++srq->wqe_shift)
 142                 ; /* nothing */
 143
 144         buf_size = srq->max << srq->wqe_shift;
 145
 146         if (mlx4_alloc_buf(&srq->buf, buf_size,
 147                            to_mdev(pd->context->device)->page_size)) {
 148                 free(srq->wrid);
 149                 return -1;
 150         }
 151
 152         memset(srq->buf.buf, 0, buf_size);
 153
 154         /*
 155          * Now initialize the SRQ buffer so that all of the WQEs are
 156          * linked into the list of free WQEs.
 157          */
 158
 159         for (i = 0; i < srq->max; ++i) {
 160                 next = get_wqe(srq, i);
 161                 next->next_wqe_index = htobe16((i + 1) & (srq->max - 1));
 162
 163                 for (scatter = (void *) (next + 1);
 164                      (void *) scatter < (void *) next + (1 << srq->wqe_shift);
 165                      ++scatter)
 166                         scatter->lkey = htobe32(MLX4_INVALID_LKEY);
 167         }
 168
 169         srq->head = 0;
 170         srq->tail = srq->max - 1;
 171
 172         return 0;
 173 }
 174
 175 void mlx4_init_xsrq_table(struct mlx4_xsrq_table *xsrq_table, int size)
 176 {
 177         memset(xsrq_table, 0, sizeof *xsrq_table);
 178         xsrq_table->num_xsrq = size;
 179         xsrq_table->shift = ffs(size) - 1 - MLX4_XSRQ_TABLE_BITS;
 180         xsrq_table->mask = (1 << xsrq_table->shift) - 1;
 181
 182         pthread_mutex_init(&xsrq_table->mutex, NULL);
 183 }
 184
 185 struct mlx4_srq *mlx4_find_xsrq(struct mlx4_xsrq_table *xsrq_table, uint32_t srqn)
 186 {
 187         int index;
 188
 189         index = (srqn & (xsrq_table->num_xsrq - 1)) >> xsrq_table->shift;
 190         if (xsrq_table->xsrq_table[index].refcnt)
 191                 return xsrq_table->xsrq_table[index].table[srqn & xsrq_table->mask];
 192
 193         return NULL;
 194 }
 195
 196 int mlx4_store_xsrq(struct mlx4_xsrq_table *xsrq_table, uint32_t srqn,
 197                     struct mlx4_srq *srq)
 198 {
 199         int index, ret = 0;
 200
 201         index = (srqn & (xsrq_table->num_xsrq - 1)) >> xsrq_table->shift;
 202         pthread_mutex_lock(&xsrq_table->mutex);
 203         if (!xsrq_table->xsrq_table[index].refcnt) {
 204                 xsrq_table->xsrq_table[index].table = calloc(xsrq_table->mask + 1,
 205                                                              sizeof(struct mlx4_srq *));
 206                 if (!xsrq_table->xsrq_table[index].table) {
 207                         ret = -1;
 208                         goto out;
 209                 }
 210         }
 211
 212         xsrq_table->xsrq_table[index].refcnt++;
 213         xsrq_table->xsrq_table[index].table[srqn & xsrq_table->mask] = srq;
 214
 215 out:
 216         pthread_mutex_unlock(&xsrq_table->mutex);
 217         return ret;
 218 }
 219
 220 void mlx4_clear_xsrq(struct mlx4_xsrq_table *xsrq_table, uint32_t srqn)
 221 {
 222         int index;
 223
 224         index = (srqn & (xsrq_table->num_xsrq - 1)) >> xsrq_table->shift;
 225         pthread_mutex_lock(&xsrq_table->mutex);
 226
 227         if (--xsrq_table->xsrq_table[index].refcnt)
 228                 xsrq_table->xsrq_table[index].table[srqn & xsrq_table->mask] = NULL;
 229         else
 230                 free(xsrq_table->xsrq_table[index].table);
 231
 232         pthread_mutex_unlock(&xsrq_table->mutex);
 233 }
 234
 235 struct ibv_srq *mlx4_create_xrc_srq(struct ibv_context *context,
 236                                     struct ibv_srq_init_attr_ex *attr_ex)
 237 {
 238         struct mlx4_create_xsrq cmd;
 239         struct mlx4_create_srq_resp resp;
 240         struct mlx4_srq *srq;
 241         int ret;
 242
 243         /* Sanity check SRQ size before proceeding */
 244         if (attr_ex->attr.max_wr > 1 << 16 || attr_ex->attr.max_sge > 64)
 245                 return NULL;
 246
 247         srq = calloc(1, sizeof *srq);
 248         if (!srq)
 249                 return NULL;
 250
 251         if (pthread_spin_init(&srq->lock, PTHREAD_PROCESS_PRIVATE))
 252                 goto err;
 253
 254         srq->max     = align_queue_size(attr_ex->attr.max_wr + 1);
 255         srq->max_gs  = attr_ex->attr.max_sge;
 256         srq->counter = 0;
 257         srq->ext_srq = 1;
 258
 259         if (mlx4_alloc_srq_buf(attr_ex->pd, &attr_ex->attr, srq))
 260                 goto err;
 261
 262         srq->db = mlx4_alloc_db(to_mctx(context), MLX4_DB_TYPE_RQ);
 263         if (!srq->db)
 264                 goto err_free;
 265
 266         *srq->db = 0;
 267
 268         cmd.buf_addr = (uintptr_t) srq->buf.buf;
 269         cmd.db_addr  = (uintptr_t) srq->db;
 270
 271         ret = ibv_cmd_create_srq_ex(context, &srq->verbs_srq,
 272                                     sizeof(srq->verbs_srq),
 273                                     attr_ex,
 274                                     &cmd.ibv_cmd, sizeof cmd,
 275                                     &resp.ibv_resp, sizeof resp);
 276         if (ret)
 277                 goto err_db;
 278
 279         ret = mlx4_store_xsrq(&to_mctx(context)->xsrq_table,
 280                               srq->verbs_srq.srq_num, srq);
 281         if (ret)
 282                 goto err_destroy;
 283
 284         return &srq->verbs_srq.srq;
 285
 286 err_destroy:
 287         ibv_cmd_destroy_srq(&srq->verbs_srq.srq);
 288 err_db:
 289         mlx4_free_db(to_mctx(context), MLX4_DB_TYPE_RQ, srq->db);
 290 err_free:
 291         free(srq->wrid);
 292         mlx4_free_buf(&srq->buf);
 293 err:
 294         free(srq);
 295         return NULL;
 296 }
 297
 298 int mlx4_destroy_xrc_srq(struct ibv_srq *srq)
 299 {
 300         struct mlx4_context *mctx = to_mctx(srq->context);
 301         struct mlx4_srq *msrq = to_msrq(srq);
 302         struct mlx4_cq *mcq;
 303         int ret;
 304
 305         mcq = to_mcq(msrq->verbs_srq.cq);
 306         mlx4_cq_clean(mcq, 0, msrq);
 307         pthread_spin_lock(&mcq->lock);
 308         mlx4_clear_xsrq(&mctx->xsrq_table, msrq->verbs_srq.srq_num);
 309         pthread_spin_unlock(&mcq->lock);
 310
 311         ret = ibv_cmd_destroy_srq(srq);
 312         if (ret) {
 313                 pthread_spin_lock(&mcq->lock);
 314                 mlx4_store_xsrq(&mctx->xsrq_table, msrq->verbs_srq.srq_num, msrq);
 315                 pthread_spin_unlock(&mcq->lock);
 316                 return ret;
 317         }
 318
 319         mlx4_free_db(mctx, MLX4_DB_TYPE_RQ, msrq->db);
 320         mlx4_free_buf(&msrq->buf);
 321         free(msrq->wrid);
 322         free(msrq);
 323
 324         return 0;
 325 }