drivers/infiniband/hw/mlx4/srq.c

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This source file includes following definitions.
get_wqe
mlx4_ib_srq_event
mlx4_ib_create_srq
mlx4_ib_modify_srq
mlx4_ib_query_srq
mlx4_ib_destroy_srq
mlx4_ib_free_srq_wqe
mlx4_ib_post_srq_recv
   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33 
  34 #include <linux/mlx4/qp.h>
  35 #include <linux/mlx4/srq.h>
  36 #include <linux/slab.h>
  37 
  38 #include "mlx4_ib.h"
  39 #include <rdma/mlx4-abi.h>
  40 #include <rdma/uverbs_ioctl.h>
  41 
  42 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
  43 {
  44         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  45 }
  46 
  47 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  48 {
  49         struct ib_event event;
  50         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  51 
  52         if (ibsrq->event_handler) {
  53                 event.device      = ibsrq->device;
  54                 event.element.srq = ibsrq;
  55                 switch (type) {
  56                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
  57                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  58                         break;
  59                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
  60                         event.event = IB_EVENT_SRQ_ERR;
  61                         break;
  62                 default:
  63                         pr_warn("Unexpected event type %d "
  64                                "on SRQ %06x\n", type, srq->srqn);
  65                         return;
  66                 }
  67 
  68                 ibsrq->event_handler(&event, ibsrq->srq_context);
  69         }
  70 }
  71 
  72 int mlx4_ib_create_srq(struct ib_srq *ib_srq,
  73                        struct ib_srq_init_attr *init_attr,
  74                        struct ib_udata *udata)
  75 {
  76         struct mlx4_ib_dev *dev = to_mdev(ib_srq->device);
  77         struct mlx4_ib_ucontext *ucontext = rdma_udata_to_drv_context(
  78                 udata, struct mlx4_ib_ucontext, ibucontext);
  79         struct mlx4_ib_srq *srq = to_msrq(ib_srq);
  80         struct mlx4_wqe_srq_next_seg *next;
  81         struct mlx4_wqe_data_seg *scatter;
  82         u32 cqn;
  83         u16 xrcdn;
  84         int desc_size;
  85         int buf_size;
  86         int err;
  87         int i;
  88 
  89         /* Sanity check SRQ size before proceeding */
  90         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  91             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  92                 return -EINVAL;
  93 
  94         mutex_init(&srq->mutex);
  95         spin_lock_init(&srq->lock);
  96         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
  97         srq->msrq.max_gs = init_attr->attr.max_sge;
  98 
  99         desc_size = max(32UL,
 100                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
 101                                            srq->msrq.max_gs *
 102                                            sizeof (struct mlx4_wqe_data_seg)));
 103         srq->msrq.wqe_shift = ilog2(desc_size);
 104 
 105         buf_size = srq->msrq.max * desc_size;
 106 
 107         if (udata) {
 108                 struct mlx4_ib_create_srq ucmd;
 109 
 110                 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)))
 111                         return -EFAULT;
 112 
 113                 srq->umem = ib_umem_get(udata, ucmd.buf_addr, buf_size, 0, 0);
 114                 if (IS_ERR(srq->umem))
 115                         return PTR_ERR(srq->umem);
 116 
 117                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 118                                     PAGE_SHIFT, &srq->mtt);
 119                 if (err)
 120                         goto err_buf;
 121 
 122                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 123                 if (err)
 124                         goto err_mtt;
 125 
 126                 err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &srq->db);
 127                 if (err)
 128                         goto err_mtt;
 129         } else {
 130                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 131                 if (err)
 132                         return err;
 133 
 134                 *srq->db.db = 0;
 135 
 136                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2,
 137                                    &srq->buf)) {
 138                         err = -ENOMEM;
 139                         goto err_db;
 140                 }
 141 
 142                 srq->head    = 0;
 143                 srq->tail    = srq->msrq.max - 1;
 144                 srq->wqe_ctr = 0;
 145 
 146                 for (i = 0; i < srq->msrq.max; ++i) {
 147                         next = get_wqe(srq, i);
 148                         next->next_wqe_index =
 149                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 150 
 151                         for (scatter = (void *) (next + 1);
 152                              (void *) scatter < (void *) next + desc_size;
 153                              ++scatter)
 154                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 155                 }
 156 
 157                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 158                                     &srq->mtt);
 159                 if (err)
 160                         goto err_buf;
 161 
 162                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 163                 if (err)
 164                         goto err_mtt;
 165 
 166                 srq->wrid = kvmalloc_array(srq->msrq.max,
 167                                            sizeof(u64), GFP_KERNEL);
 168                 if (!srq->wrid) {
 169                         err = -ENOMEM;
 170                         goto err_mtt;
 171                 }
 172         }
 173 
 174         cqn = ib_srq_has_cq(init_attr->srq_type) ?
 175                 to_mcq(init_attr->ext.cq)->mcq.cqn : 0;
 176         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
 177                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
 178                 (u16) dev->dev->caps.reserved_xrcds;
 179         err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn,
 180                              &srq->mtt, srq->db.dma, &srq->msrq);
 181         if (err)
 182                 goto err_wrid;
 183 
 184         srq->msrq.event = mlx4_ib_srq_event;
 185         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 186 
 187         if (udata)
 188                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 189                         err = -EFAULT;
 190                         goto err_wrid;
 191                 }
 192 
 193         init_attr->attr.max_wr = srq->msrq.max - 1;
 194 
 195         return 0;
 196 
 197 err_wrid:
 198         if (udata)
 199                 mlx4_ib_db_unmap_user(ucontext, &srq->db);
 200         else
 201                 kvfree(srq->wrid);
 202 
 203 err_mtt:
 204         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 205 
 206 err_buf:
 207         if (!srq->umem)
 208                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 209         ib_umem_release(srq->umem);
 210 
 211 err_db:
 212         if (!udata)
 213                 mlx4_db_free(dev->dev, &srq->db);
 214 
 215         return err;
 216 }
 217 
 218 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 219                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 220 {
 221         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 222         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 223         int ret;
 224 
 225         /* We don't support resizing SRQs (yet?) */
 226         if (attr_mask & IB_SRQ_MAX_WR)
 227                 return -EINVAL;
 228 
 229         if (attr_mask & IB_SRQ_LIMIT) {
 230                 if (attr->srq_limit >= srq->msrq.max)
 231                         return -EINVAL;
 232 
 233                 mutex_lock(&srq->mutex);
 234                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 235                 mutex_unlock(&srq->mutex);
 236 
 237                 if (ret)
 238                         return ret;
 239         }
 240 
 241         return 0;
 242 }
 243 
 244 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 245 {
 246         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 247         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 248         int ret;
 249         int limit_watermark;
 250 
 251         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 252         if (ret)
 253                 return ret;
 254 
 255         srq_attr->srq_limit = limit_watermark;
 256         srq_attr->max_wr    = srq->msrq.max - 1;
 257         srq_attr->max_sge   = srq->msrq.max_gs;
 258 
 259         return 0;
 260 }
 261 
 262 void mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
 263 {
 264         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 265         struct mlx4_ib_srq *msrq = to_msrq(srq);
 266 
 267         mlx4_srq_free(dev->dev, &msrq->msrq);
 268         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 269 
 270         if (udata) {
 271                 mlx4_ib_db_unmap_user(
 272                         rdma_udata_to_drv_context(
 273                                 udata,
 274                                 struct mlx4_ib_ucontext,
 275                                 ibucontext),
 276                         &msrq->db);
 277         } else {
 278                 kvfree(msrq->wrid);
 279                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 280                               &msrq->buf);
 281                 mlx4_db_free(dev->dev, &msrq->db);
 282         }
 283         ib_umem_release(msrq->umem);
 284 }
 285 
 286 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 287 {
 288         struct mlx4_wqe_srq_next_seg *next;
 289 
 290         /* always called with interrupts disabled. */
 291         spin_lock(&srq->lock);
 292 
 293         next = get_wqe(srq, srq->tail);
 294         next->next_wqe_index = cpu_to_be16(wqe_index);
 295         srq->tail = wqe_index;
 296 
 297         spin_unlock(&srq->lock);
 298 }
 299 
 300 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 301                           const struct ib_recv_wr **bad_wr)
 302 {
 303         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 304         struct mlx4_wqe_srq_next_seg *next;
 305         struct mlx4_wqe_data_seg *scat;
 306         unsigned long flags;
 307         int err = 0;
 308         int nreq;
 309         int i;
 310         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
 311 
 312         spin_lock_irqsave(&srq->lock, flags);
 313         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
 314                 err = -EIO;
 315                 *bad_wr = wr;
 316                 nreq = 0;
 317                 goto out;
 318         }
 319 
 320         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 321                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 322                         err = -EINVAL;
 323                         *bad_wr = wr;
 324                         break;
 325                 }
 326 
 327                 if (unlikely(srq->head == srq->tail)) {
 328                         err = -ENOMEM;
 329                         *bad_wr = wr;
 330                         break;
 331                 }
 332 
 333                 srq->wrid[srq->head] = wr->wr_id;
 334 
 335                 next      = get_wqe(srq, srq->head);
 336                 srq->head = be16_to_cpu(next->next_wqe_index);
 337                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 338 
 339                 for (i = 0; i < wr->num_sge; ++i) {
 340                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 341                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 342                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 343                 }
 344 
 345                 if (i < srq->msrq.max_gs) {
 346                         scat[i].byte_count = 0;
 347                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 348                         scat[i].addr       = 0;
 349                 }
 350         }
 351 
 352         if (likely(nreq)) {
 353                 srq->wqe_ctr += nreq;
 354 
 355                 /*
 356                  * Make sure that descriptors are written before
 357                  * doorbell record.
 358                  */
 359                 wmb();
 360 
 361                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 362         }
 363 out:
 364 
 365         spin_unlock_irqrestore(&srq->lock, flags);
 366 
 367         return err;
 368 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/hw/mlx4/srq.c

DEFINITIONS
