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 "user.h"
  40
  41 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
  42 {
  43         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  44 }
  45
  46 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  47 {
  48         struct ib_event event;
  49         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  50
  51         if (ibsrq->event_handler) {
  52                 event.device      = ibsrq->device;
  53                 event.element.srq = ibsrq;
  54                 switch (type) {
  55                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
  56                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  57                         break;
  58                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
  59                         event.event = IB_EVENT_SRQ_ERR;
  60                         break;
  61                 default:
  62                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
  63                                "on SRQ %06x\n", type, srq->srqn);
  64                         return;
  65                 }
  66
  67                 ibsrq->event_handler(&event, ibsrq->srq_context);
  68         }
  69 }
  70
  71 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
  72                                   struct ib_srq_init_attr *init_attr,
  73                                   struct ib_udata *udata)
  74 {
  75         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  76         struct mlx4_ib_srq *srq;
  77         struct mlx4_wqe_srq_next_seg *next;
  78         struct mlx4_wqe_data_seg *scatter;
  79         int desc_size;
  80         int buf_size;
  81         int err;
  82         int i;
  83
  84         /* Sanity check SRQ size before proceeding */
  85         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  86             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  87                 return ERR_PTR(-EINVAL);
  88
  89         srq = kmalloc(sizeof *srq, GFP_KERNEL);
  90         if (!srq)
  91                 return ERR_PTR(-ENOMEM);
  92
  93         mutex_init(&srq->mutex);
  94         spin_lock_init(&srq->lock);
  95         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
  96         srq->msrq.max_gs = init_attr->attr.max_sge;
  97
  98         desc_size = max(32UL,
  99                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
 100                                            srq->msrq.max_gs *
 101                                            sizeof (struct mlx4_wqe_data_seg)));
 102         srq->msrq.wqe_shift = ilog2(desc_size);
 103
 104         buf_size = srq->msrq.max * desc_size;
 105
 106         if (pd->uobject) {
 107                 struct mlx4_ib_create_srq ucmd;
 108
 109                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 110                         err = -EFAULT;
 111                         goto err_srq;
 112                 }
 113
 114                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 115                                         buf_size, 0, 0);
 116                 if (IS_ERR(srq->umem)) {
 117                         err = PTR_ERR(srq->umem);
 118                         goto err_srq;
 119                 }
 120
 121                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 122                                     ilog2(srq->umem->page_size), &srq->mtt);
 123                 if (err)
 124                         goto err_buf;
 125
 126                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 127                 if (err)
 128                         goto err_mtt;
 129
 130                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 131                                           ucmd.db_addr, &srq->db);
 132                 if (err)
 133                         goto err_mtt;
 134         } else {
 135                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 136                 if (err)
 137                         goto err_srq;
 138
 139                 *srq->db.db = 0;
 140
 141                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
 142                         err = -ENOMEM;
 143                         goto err_db;
 144                 }
 145
 146                 srq->head    = 0;
 147                 srq->tail    = srq->msrq.max - 1;
 148                 srq->wqe_ctr = 0;
 149
 150                 for (i = 0; i < srq->msrq.max; ++i) {
 151                         next = get_wqe(srq, i);
 152                         next->next_wqe_index =
 153                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 154
 155                         for (scatter = (void *) (next + 1);
 156                              (void *) scatter < (void *) next + desc_size;
 157                              ++scatter)
 158                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 159                 }
 160
 161                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 162                                     &srq->mtt);
 163                 if (err)
 164                         goto err_buf;
 165
 166                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 167                 if (err)
 168                         goto err_mtt;
 169
 170                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
 171                 if (!srq->wrid) {
 172                         err = -ENOMEM;
 173                         goto err_mtt;
 174                 }
 175         }
 176
 177         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
 178                              srq->db.dma, &srq->msrq);
 179         if (err)
 180                 goto err_wrid;
 181
 182         srq->msrq.event = mlx4_ib_srq_event;
 183
 184         if (pd->uobject)
 185                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 186                         err = -EFAULT;
 187                         goto err_wrid;
 188                 }
 189
 190         init_attr->attr.max_wr = srq->msrq.max - 1;
 191
 192         return &srq->ibsrq;
 193
 194 err_wrid:
 195         if (pd->uobject)
 196                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 197         else
 198                 kfree(srq->wrid);
 199
 200 err_mtt:
 201         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 202
 203 err_buf:
 204         if (pd->uobject)
 205                 ib_umem_release(srq->umem);
 206         else
 207                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 208
 209 err_db:
 210         if (!pd->uobject)
 211                 mlx4_db_free(dev->dev, &srq->db);
 212
 213 err_srq:
 214         kfree(srq);
 215
 216         return ERR_PTR(err);
 217 }
 218
 219 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 220                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 221 {
 222         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 223         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 224         int ret;
 225
 226         /* We don't support resizing SRQs (yet?) */
 227         if (attr_mask & IB_SRQ_MAX_WR)
 228                 return -EINVAL;
 229
 230         if (attr_mask & IB_SRQ_LIMIT) {
 231                 if (attr->srq_limit >= srq->msrq.max)
 232                         return -EINVAL;
 233
 234                 mutex_lock(&srq->mutex);
 235                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 236                 mutex_unlock(&srq->mutex);
 237
 238                 if (ret)
 239                         return ret;
 240         }
 241
 242         return 0;
 243 }
 244
 245 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 246 {
 247         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 248         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 249         int ret;
 250         int limit_watermark;
 251
 252         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 253         if (ret)
 254                 return ret;
 255
 256         srq_attr->srq_limit = limit_watermark;
 257         srq_attr->max_wr    = srq->msrq.max - 1;
 258         srq_attr->max_sge   = srq->msrq.max_gs;
 259
 260         return 0;
 261 }
 262
 263 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 264 {
 265         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 266         struct mlx4_ib_srq *msrq = to_msrq(srq);
 267
 268         mlx4_srq_free(dev->dev, &msrq->msrq);
 269         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 270
 271         if (srq->uobject) {
 272                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 273                 ib_umem_release(msrq->umem);
 274         } else {
 275                 kfree(msrq->wrid);
 276                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 277                               &msrq->buf);
 278                 mlx4_db_free(dev->dev, &msrq->db);
 279         }
 280
 281         kfree(msrq);
 282
 283         return 0;
 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, struct ib_recv_wr *wr,
 301                           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
 311         spin_lock_irqsave(&srq->lock, flags);
 312
 313         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 314                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 315                         err = -EINVAL;
 316                         *bad_wr = wr;
 317                         break;
 318                 }
 319
 320                 if (unlikely(srq->head == srq->tail)) {
 321                         err = -ENOMEM;
 322                         *bad_wr = wr;
 323                         break;
 324                 }
 325
 326                 srq->wrid[srq->head] = wr->wr_id;
 327
 328                 next      = get_wqe(srq, srq->head);
 329                 srq->head = be16_to_cpu(next->next_wqe_index);
 330                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 331
 332                 for (i = 0; i < wr->num_sge; ++i) {
 333                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 334                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 335                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 336                 }
 337
 338                 if (i < srq->msrq.max_gs) {
 339                         scat[i].byte_count = 0;
 340                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 341                         scat[i].addr       = 0;
 342                 }
 343         }
 344
 345         if (likely(nreq)) {
 346                 srq->wqe_ctr += nreq;
 347
 348                 /*
 349                  * Make sure that descriptors are written before
 350                  * doorbell record.
 351                  */
 352                 wmb();
 353
 354                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 355         }
 356
 357         spin_unlock_irqrestore(&srq->lock, flags);
 358
 359         return err;
 360 }