drivers/infiniband/hw/mlx4/srq.c

   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         if (init_attr->srq_type != IB_SRQT_BASIC &&
  90             init_attr->srq_type != IB_SRQT_XRC)
  91                 return -EOPNOTSUPP;
  92
  93         /* Sanity check SRQ size before proceeding */
  94         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  95             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  96                 return -EINVAL;
  97
  98         mutex_init(&srq->mutex);
  99         spin_lock_init(&srq->lock);
 100         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 101         srq->msrq.max_gs = init_attr->attr.max_sge;
 102
 103         desc_size = max(32UL,
 104                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
 105                                            srq->msrq.max_gs *
 106                                            sizeof (struct mlx4_wqe_data_seg)));
 107         srq->msrq.wqe_shift = ilog2(desc_size);
 108
 109         buf_size = srq->msrq.max * desc_size;
 110
 111         if (udata) {
 112                 struct mlx4_ib_create_srq ucmd;
 113
 114                 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)))
 115                         return -EFAULT;
 116
 117                 srq->umem =
 118                         ib_umem_get(ib_srq->device, ucmd.buf_addr, buf_size, 0);
 119                 if (IS_ERR(srq->umem))
 120                         return PTR_ERR(srq->umem);
 121
 122                 err = mlx4_mtt_init(
 123                         dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE),
 124                         PAGE_SHIFT, &srq->mtt);
 125                 if (err)
 126                         goto err_buf;
 127
 128                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 129                 if (err)
 130                         goto err_mtt;
 131
 132                 err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &srq->db);
 133                 if (err)
 134                         goto err_mtt;
 135         } else {
 136                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 137                 if (err)
 138                         return err;
 139
 140                 *srq->db.db = 0;
 141
 142                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2,
 143                                    &srq->buf)) {
 144                         err = -ENOMEM;
 145                         goto err_db;
 146                 }
 147
 148                 srq->head    = 0;
 149                 srq->tail    = srq->msrq.max - 1;
 150                 srq->wqe_ctr = 0;
 151
 152                 for (i = 0; i < srq->msrq.max; ++i) {
 153                         next = get_wqe(srq, i);
 154                         next->next_wqe_index =
 155                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 156
 157                         for (scatter = (void *) (next + 1);
 158                              (void *) scatter < (void *) next + desc_size;
 159                              ++scatter)
 160                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 161                 }
 162
 163                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 164                                     &srq->mtt);
 165                 if (err)
 166                         goto err_buf;
 167
 168                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 169                 if (err)
 170                         goto err_mtt;
 171
 172                 srq->wrid = kvmalloc_array(srq->msrq.max,
 173                                            sizeof(u64), GFP_KERNEL);
 174                 if (!srq->wrid) {
 175                         err = -ENOMEM;
 176                         goto err_mtt;
 177                 }
 178         }
 179
 180         cqn = ib_srq_has_cq(init_attr->srq_type) ?
 181                 to_mcq(init_attr->ext.cq)->mcq.cqn : 0;
 182         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
 183                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
 184                 (u16) dev->dev->caps.reserved_xrcds;
 185         err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn,
 186                              &srq->mtt, srq->db.dma, &srq->msrq);
 187         if (err)
 188                 goto err_wrid;
 189
 190         srq->msrq.event = mlx4_ib_srq_event;
 191         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 192
 193         if (udata)
 194                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 195                         err = -EFAULT;
 196                         goto err_wrid;
 197                 }
 198
 199         init_attr->attr.max_wr = srq->msrq.max - 1;
 200
 201         return 0;
 202
 203 err_wrid:
 204         if (udata)
 205                 mlx4_ib_db_unmap_user(ucontext, &srq->db);
 206         else
 207                 kvfree(srq->wrid);
 208
 209 err_mtt:
 210         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 211
 212 err_buf:
 213         if (!srq->umem)
 214                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 215         ib_umem_release(srq->umem);
 216
 217 err_db:
 218         if (!udata)
 219                 mlx4_db_free(dev->dev, &srq->db);
 220
 221         return err;
 222 }
 223
 224 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 225                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 226 {
 227         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 228         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 229         int ret;
 230
 231         /* We don't support resizing SRQs (yet?) */
 232         if (attr_mask & IB_SRQ_MAX_WR)
 233                 return -EINVAL;
 234
 235         if (attr_mask & IB_SRQ_LIMIT) {
 236                 if (attr->srq_limit >= srq->msrq.max)
 237                         return -EINVAL;
 238
 239                 mutex_lock(&srq->mutex);
 240                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 241                 mutex_unlock(&srq->mutex);
 242
 243                 if (ret)
 244                         return ret;
 245         }
 246
 247         return 0;
 248 }
 249
 250 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 251 {
 252         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 253         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 254         int ret;
 255         int limit_watermark;
 256
 257         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 258         if (ret)
 259                 return ret;
 260
 261         srq_attr->srq_limit = limit_watermark;
 262         srq_attr->max_wr    = srq->msrq.max - 1;
 263         srq_attr->max_sge   = srq->msrq.max_gs;
 264
 265         return 0;
 266 }
 267
 268 int mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
 269 {
 270         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 271         struct mlx4_ib_srq *msrq = to_msrq(srq);
 272
 273         mlx4_srq_free(dev->dev, &msrq->msrq);
 274         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 275
 276         if (udata) {
 277                 mlx4_ib_db_unmap_user(
 278                         rdma_udata_to_drv_context(
 279                                 udata,
 280                                 struct mlx4_ib_ucontext,
 281                                 ibucontext),
 282                         &msrq->db);
 283         } else {
 284                 kvfree(msrq->wrid);
 285                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 286                               &msrq->buf);
 287                 mlx4_db_free(dev->dev, &msrq->db);
 288         }
 289         ib_umem_release(msrq->umem);
 290         return 0;
 291 }
 292
 293 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 294 {
 295         struct mlx4_wqe_srq_next_seg *next;
 296
 297         /* always called with interrupts disabled. */
 298         spin_lock(&srq->lock);
 299
 300         next = get_wqe(srq, srq->tail);
 301         next->next_wqe_index = cpu_to_be16(wqe_index);
 302         srq->tail = wqe_index;
 303
 304         spin_unlock(&srq->lock);
 305 }
 306
 307 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 308                           const struct ib_recv_wr **bad_wr)
 309 {
 310         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 311         struct mlx4_wqe_srq_next_seg *next;
 312         struct mlx4_wqe_data_seg *scat;
 313         unsigned long flags;
 314         int err = 0;
 315         int nreq;
 316         int i;
 317         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
 318
 319         spin_lock_irqsave(&srq->lock, flags);
 320         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
 321                 err = -EIO;
 322                 *bad_wr = wr;
 323                 goto out;
 324         }
 325
 326         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 327                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 328                         err = -EINVAL;
 329                         *bad_wr = wr;
 330                         break;
 331                 }
 332
 333                 if (unlikely(srq->head == srq->tail)) {
 334                         err = -ENOMEM;
 335                         *bad_wr = wr;
 336                         break;
 337                 }
 338
 339                 srq->wrid[srq->head] = wr->wr_id;
 340
 341                 next      = get_wqe(srq, srq->head);
 342                 srq->head = be16_to_cpu(next->next_wqe_index);
 343                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 344
 345                 for (i = 0; i < wr->num_sge; ++i) {
 346                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 347                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 348                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 349                 }
 350
 351                 if (i < srq->msrq.max_gs) {
 352                         scat[i].byte_count = 0;
 353                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 354                         scat[i].addr       = 0;
 355                 }
 356         }
 357
 358         if (likely(nreq)) {
 359                 srq->wqe_ctr += nreq;
 360
 361                 /*
 362                  * Make sure that descriptors are written before
 363                  * doorbell record.
 364                  */
 365                 wmb();
 366
 367                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 368         }
 369 out:
 370
 371         spin_unlock_irqrestore(&srq->lock, flags);
 372
 373         return err;
 374 }