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 #include <linux/vmalloc.h>
  38
  39 #include "mlx4_ib.h"
  40 #include <rdma/mlx4-abi.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 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
  73                                   struct ib_srq_init_attr *init_attr,
  74                                   struct ib_udata *udata)
  75 {
  76         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  77         struct mlx4_ib_srq *srq;
  78         struct mlx4_wqe_srq_next_seg *next;
  79         struct mlx4_wqe_data_seg *scatter;
  80         u32 cqn;
  81         u16 xrcdn;
  82         int desc_size;
  83         int buf_size;
  84         int err;
  85         int i;
  86
  87         /* Sanity check SRQ size before proceeding */
  88         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  89             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  90                 return ERR_PTR(-EINVAL);
  91
  92         srq = kmalloc(sizeof *srq, GFP_KERNEL);
  93         if (!srq)
  94                 return ERR_PTR(-ENOMEM);
  95
  96         mutex_init(&srq->mutex);
  97         spin_lock_init(&srq->lock);
  98         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
  99         srq->msrq.max_gs = init_attr->attr.max_sge;
 100
 101         desc_size = max(32UL,
 102                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
 103                                            srq->msrq.max_gs *
 104                                            sizeof (struct mlx4_wqe_data_seg)));
 105         srq->msrq.wqe_shift = ilog2(desc_size);
 106
 107         buf_size = srq->msrq.max * desc_size;
 108
 109         if (pd->uobject) {
 110                 struct mlx4_ib_create_srq ucmd;
 111
 112                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 113                         err = -EFAULT;
 114                         goto err_srq;
 115                 }
 116
 117                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 118                                         buf_size, 0, 0);
 119                 if (IS_ERR(srq->umem)) {
 120                         err = PTR_ERR(srq->umem);
 121                         goto err_srq;
 122                 }
 123
 124                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 125                                     srq->umem->page_shift, &srq->mtt);
 126                 if (err)
 127                         goto err_buf;
 128
 129                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 130                 if (err)
 131                         goto err_mtt;
 132
 133                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 134                                           ucmd.db_addr, &srq->db);
 135                 if (err)
 136                         goto err_mtt;
 137         } else {
 138                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 139                 if (err)
 140                         goto err_srq;
 141
 142                 *srq->db.db = 0;
 143
 144                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2,
 145                                    &srq->buf)) {
 146                         err = -ENOMEM;
 147                         goto err_db;
 148                 }
 149
 150                 srq->head    = 0;
 151                 srq->tail    = srq->msrq.max - 1;
 152                 srq->wqe_ctr = 0;
 153
 154                 for (i = 0; i < srq->msrq.max; ++i) {
 155                         next = get_wqe(srq, i);
 156                         next->next_wqe_index =
 157                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 158
 159                         for (scatter = (void *) (next + 1);
 160                              (void *) scatter < (void *) next + desc_size;
 161                              ++scatter)
 162                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 163                 }
 164
 165                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 166                                     &srq->mtt);
 167                 if (err)
 168                         goto err_buf;
 169
 170                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 171                 if (err)
 172                         goto err_mtt;
 173
 174                 srq->wrid = kmalloc_array(srq->msrq.max, sizeof(u64),
 175                                         GFP_KERNEL | __GFP_NOWARN);
 176                 if (!srq->wrid) {
 177                         srq->wrid = __vmalloc(srq->msrq.max * sizeof(u64),
 178                                               GFP_KERNEL, PAGE_KERNEL);
 179                         if (!srq->wrid) {
 180                                 err = -ENOMEM;
 181                                 goto err_mtt;
 182                         }
 183                 }
 184         }
 185
 186         cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
 187                 to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
 188         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
 189                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
 190                 (u16) dev->dev->caps.reserved_xrcds;
 191         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
 192                              srq->db.dma, &srq->msrq);
 193         if (err)
 194                 goto err_wrid;
 195
 196         srq->msrq.event = mlx4_ib_srq_event;
 197         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 198
 199         if (pd->uobject)
 200                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 201                         err = -EFAULT;
 202                         goto err_wrid;
 203                 }
 204
 205         init_attr->attr.max_wr = srq->msrq.max - 1;
 206
 207         return &srq->ibsrq;
 208
 209 err_wrid:
 210         if (pd->uobject)
 211                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 212         else
 213                 kvfree(srq->wrid);
 214
 215 err_mtt:
 216         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 217
 218 err_buf:
 219         if (pd->uobject)
 220                 ib_umem_release(srq->umem);
 221         else
 222                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 223
 224 err_db:
 225         if (!pd->uobject)
 226                 mlx4_db_free(dev->dev, &srq->db);
 227
 228 err_srq:
 229         kfree(srq);
 230
 231         return ERR_PTR(err);
 232 }
 233
 234 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 235                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 236 {
 237         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 238         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 239         int ret;
 240
 241         /* We don't support resizing SRQs (yet?) */
 242         if (attr_mask & IB_SRQ_MAX_WR)
 243                 return -EINVAL;
 244
 245         if (attr_mask & IB_SRQ_LIMIT) {
 246                 if (attr->srq_limit >= srq->msrq.max)
 247                         return -EINVAL;
 248
 249                 mutex_lock(&srq->mutex);
 250                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 251                 mutex_unlock(&srq->mutex);
 252
 253                 if (ret)
 254                         return ret;
 255         }
 256
 257         return 0;
 258 }
 259
 260 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 261 {
 262         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 263         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 264         int ret;
 265         int limit_watermark;
 266
 267         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 268         if (ret)
 269                 return ret;
 270
 271         srq_attr->srq_limit = limit_watermark;
 272         srq_attr->max_wr    = srq->msrq.max - 1;
 273         srq_attr->max_sge   = srq->msrq.max_gs;
 274
 275         return 0;
 276 }
 277
 278 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 279 {
 280         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 281         struct mlx4_ib_srq *msrq = to_msrq(srq);
 282
 283         mlx4_srq_free(dev->dev, &msrq->msrq);
 284         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 285
 286         if (srq->uobject) {
 287                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 288                 ib_umem_release(msrq->umem);
 289         } else {
 290                 kvfree(msrq->wrid);
 291                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 292                               &msrq->buf);
 293                 mlx4_db_free(dev->dev, &msrq->db);
 294         }
 295
 296         kfree(msrq);
 297
 298         return 0;
 299 }
 300
 301 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 302 {
 303         struct mlx4_wqe_srq_next_seg *next;
 304
 305         /* always called with interrupts disabled. */
 306         spin_lock(&srq->lock);
 307
 308         next = get_wqe(srq, srq->tail);
 309         next->next_wqe_index = cpu_to_be16(wqe_index);
 310         srq->tail = wqe_index;
 311
 312         spin_unlock(&srq->lock);
 313 }
 314
 315 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 316                           struct ib_recv_wr **bad_wr)
 317 {
 318         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 319         struct mlx4_wqe_srq_next_seg *next;
 320         struct mlx4_wqe_data_seg *scat;
 321         unsigned long flags;
 322         int err = 0;
 323         int nreq;
 324         int i;
 325         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
 326
 327         spin_lock_irqsave(&srq->lock, flags);
 328         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
 329                 err = -EIO;
 330                 *bad_wr = wr;
 331                 nreq = 0;
 332                 goto out;
 333         }
 334
 335         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 336                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 337                         err = -EINVAL;
 338                         *bad_wr = wr;
 339                         break;
 340                 }
 341
 342                 if (unlikely(srq->head == srq->tail)) {
 343                         err = -ENOMEM;
 344                         *bad_wr = wr;
 345                         break;
 346                 }
 347
 348                 srq->wrid[srq->head] = wr->wr_id;
 349
 350                 next      = get_wqe(srq, srq->head);
 351                 srq->head = be16_to_cpu(next->next_wqe_index);
 352                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 353
 354                 for (i = 0; i < wr->num_sge; ++i) {
 355                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 356                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 357                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 358                 }
 359
 360                 if (i < srq->msrq.max_gs) {
 361                         scat[i].byte_count = 0;
 362                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 363                         scat[i].addr       = 0;
 364                 }
 365         }
 366
 367         if (likely(nreq)) {
 368                 srq->wqe_ctr += nreq;
 369
 370                 /*
 371                  * Make sure that descriptors are written before
 372                  * doorbell record.
 373                  */
 374                 wmb();
 375
 376                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 377         }
 378 out:
 379
 380         spin_unlock_irqrestore(&srq->lock, flags);
 381
 382         return err;
 383 }