drivers/infiniband/hw/mlx4/srq.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, 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 <linux/mlx4/qp.h>
  34 #include <linux/mlx4/srq.h>
  35
  36 #include "mlx4_ib.h"
  37 #include "user.h"
  38
  39 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
  40 {
  41         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  42 }
  43
  44 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  45 {
  46         struct ib_event event;
  47         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  48
  49         if (ibsrq->event_handler) {
  50                 event.device      = ibsrq->device;
  51                 event.element.srq = ibsrq;
  52                 switch (type) {
  53                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
  54                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  55                         break;
  56                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
  57                         event.event = IB_EVENT_SRQ_ERR;
  58                         break;
  59                 default:
  60                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
  61                                "on SRQ %06x\n", type, srq->srqn);
  62                         return;
  63                 }
  64
  65                 ibsrq->event_handler(&event, ibsrq->srq_context);
  66         }
  67 }
  68
  69 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
  70                                   struct ib_srq_init_attr *init_attr,
  71                                   struct ib_udata *udata)
  72 {
  73         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  74         struct mlx4_ib_srq *srq;
  75         struct mlx4_wqe_srq_next_seg *next;
  76         int desc_size;
  77         int buf_size;
  78         int err;
  79         int i;
  80
  81         /* Sanity check SRQ size before proceeding */
  82         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  83             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  84                 return ERR_PTR(-EINVAL);
  85
  86         srq = kmalloc(sizeof *srq, GFP_KERNEL);
  87         if (!srq)
  88                 return ERR_PTR(-ENOMEM);
  89
  90         mutex_init(&srq->mutex);
  91         spin_lock_init(&srq->lock);
  92         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
  93         srq->msrq.max_gs = init_attr->attr.max_sge;
  94
  95         desc_size = max(32UL,
  96                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
  97                                            srq->msrq.max_gs *
  98                                            sizeof (struct mlx4_wqe_data_seg)));
  99         srq->msrq.wqe_shift = ilog2(desc_size);
 100
 101         buf_size = srq->msrq.max * desc_size;
 102
 103         if (pd->uobject) {
 104                 struct mlx4_ib_create_srq ucmd;
 105
 106                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 107                         err = -EFAULT;
 108                         goto err_srq;
 109                 }
 110
 111                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 112                                         buf_size, 0);
 113                 if (IS_ERR(srq->umem)) {
 114                         err = PTR_ERR(srq->umem);
 115                         goto err_srq;
 116                 }
 117
 118                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 119                                     ilog2(srq->umem->page_size), &srq->mtt);
 120                 if (err)
 121                         goto err_buf;
 122
 123                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 124                 if (err)
 125                         goto err_mtt;
 126
 127                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 128                                           ucmd.db_addr, &srq->db);
 129                 if (err)
 130                         goto err_mtt;
 131         } else {
 132                 err = mlx4_ib_db_alloc(dev, &srq->db, 0);
 133                 if (err)
 134                         goto err_srq;
 135
 136                 *srq->db.db = 0;
 137
 138                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
 139                         err = -ENOMEM;
 140                         goto err_db;
 141                 }
 142
 143                 srq->head    = 0;
 144                 srq->tail    = srq->msrq.max - 1;
 145                 srq->wqe_ctr = 0;
 146
 147                 for (i = 0; i < srq->msrq.max; ++i) {
 148                         next = get_wqe(srq, i);
 149                         next->next_wqe_index =
 150                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 151                 }
 152
 153                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 154                                     &srq->mtt);
 155                 if (err)
 156                         goto err_buf;
 157
 158                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 159                 if (err)
 160                         goto err_mtt;
 161
 162                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
 163                 if (!srq->wrid) {
 164                         err = -ENOMEM;
 165                         goto err_mtt;
 166                 }
 167         }
 168
 169         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
 170                              srq->db.dma, &srq->msrq);
 171         if (err)
 172                 goto err_wrid;
 173
 174         srq->msrq.event = mlx4_ib_srq_event;
 175
 176         if (pd->uobject)
 177                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 178                         err = -EFAULT;
 179                         goto err_wrid;
 180                 }
 181
 182         init_attr->attr.max_wr = srq->msrq.max - 1;
 183
 184         return &srq->ibsrq;
 185
 186 err_wrid:
 187         if (pd->uobject)
 188                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 189         else
 190                 kfree(srq->wrid);
 191
 192 err_mtt:
 193         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 194
 195 err_buf:
 196         if (pd->uobject)
 197                 ib_umem_release(srq->umem);
 198         else
 199                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 200
 201 err_db:
 202         if (!pd->uobject)
 203                 mlx4_ib_db_free(dev, &srq->db);
 204
 205 err_srq:
 206         kfree(srq);
 207
 208         return ERR_PTR(err);
 209 }
 210
 211 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 212                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 213 {
 214         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 215         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 216         int ret;
 217
 218         /* We don't support resizing SRQs (yet?) */
 219         if (attr_mask & IB_SRQ_MAX_WR)
 220                 return -EINVAL;
 221
 222         if (attr_mask & IB_SRQ_LIMIT) {
 223                 if (attr->srq_limit >= srq->msrq.max)
 224                         return -EINVAL;
 225
 226                 mutex_lock(&srq->mutex);
 227                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 228                 mutex_unlock(&srq->mutex);
 229
 230                 if (ret)
 231                         return ret;
 232         }
 233
 234         return 0;
 235 }
 236
 237 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 238 {
 239         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 240         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 241         int ret;
 242         int limit_watermark;
 243
 244         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 245         if (ret)
 246                 return ret;
 247
 248         srq_attr->srq_limit = limit_watermark;
 249         srq_attr->max_wr    = srq->msrq.max - 1;
 250         srq_attr->max_sge   = srq->msrq.max_gs;
 251
 252         return 0;
 253 }
 254
 255 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 256 {
 257         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 258         struct mlx4_ib_srq *msrq = to_msrq(srq);
 259
 260         mlx4_srq_free(dev->dev, &msrq->msrq);
 261         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 262
 263         if (srq->uobject) {
 264                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 265                 ib_umem_release(msrq->umem);
 266         } else {
 267                 kfree(msrq->wrid);
 268                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 269                               &msrq->buf);
 270                 mlx4_ib_db_free(dev, &msrq->db);
 271         }
 272
 273         kfree(msrq);
 274
 275         return 0;
 276 }
 277
 278 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 279 {
 280         struct mlx4_wqe_srq_next_seg *next;
 281
 282         /* always called with interrupts disabled. */
 283         spin_lock(&srq->lock);
 284
 285         next = get_wqe(srq, srq->tail);
 286         next->next_wqe_index = cpu_to_be16(wqe_index);
 287         srq->tail = wqe_index;
 288
 289         spin_unlock(&srq->lock);
 290 }
 291
 292 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 293                           struct ib_recv_wr **bad_wr)
 294 {
 295         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 296         struct mlx4_wqe_srq_next_seg *next;
 297         struct mlx4_wqe_data_seg *scat;
 298         unsigned long flags;
 299         int err = 0;
 300         int nreq;
 301         int i;
 302
 303         spin_lock_irqsave(&srq->lock, flags);
 304
 305         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 306                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 307                         err = -EINVAL;
 308                         *bad_wr = wr;
 309                         break;
 310                 }
 311
 312                 if (unlikely(srq->head == srq->tail)) {
 313                         err = -ENOMEM;
 314                         *bad_wr = wr;
 315                         break;
 316                 }
 317
 318                 srq->wrid[srq->head] = wr->wr_id;
 319
 320                 next      = get_wqe(srq, srq->head);
 321                 srq->head = be16_to_cpu(next->next_wqe_index);
 322                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 323
 324                 for (i = 0; i < wr->num_sge; ++i) {
 325                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 326                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 327                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 328                 }
 329
 330                 if (i < srq->msrq.max_gs) {
 331                         scat[i].byte_count = 0;
 332                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 333                         scat[i].addr       = 0;
 334                 }
 335         }
 336
 337         if (likely(nreq)) {
 338                 srq->wqe_ctr += nreq;
 339
 340                 /*
 341                  * Make sure that descriptors are written before
 342                  * doorbell record.
 343                  */
 344                 wmb();
 345
 346                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 347         }
 348
 349         spin_unlock_irqrestore(&srq->lock, flags);
 350
 351         return err;
 352 }