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         int offset = n << srq->msrq.wqe_shift;
  42
  43         if (srq->buf.nbufs == 1)
  44                 return srq->buf.u.direct.buf + offset;
  45         else
  46                 return srq->buf.u.page_list[offset >> PAGE_SHIFT].buf +
  47                         (offset & (PAGE_SIZE - 1));
  48 }
  49
  50 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  51 {
  52         struct ib_event event;
  53         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  54
  55         if (ibsrq->event_handler) {
  56                 event.device      = ibsrq->device;
  57                 event.element.srq = ibsrq;
  58                 switch (type) {
  59                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
  60                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  61                         break;
  62                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
  63                         event.event = IB_EVENT_SRQ_ERR;
  64                         break;
  65                 default:
  66                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
  67                                "on SRQ %06x\n", type, srq->srqn);
  68                         return;
  69                 }
  70
  71                 ibsrq->event_handler(&event, ibsrq->srq_context);
  72         }
  73 }
  74
  75 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
  76                                   struct ib_srq_init_attr *init_attr,
  77                                   struct ib_udata *udata)
  78 {
  79         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  80         struct mlx4_ib_srq *srq;
  81         struct mlx4_wqe_srq_next_seg *next;
  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);
 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                                     ilog2(srq->umem->page_size), &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_ib_db_alloc(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, &srq->buf)) {
 145                         err = -ENOMEM;
 146                         goto err_db;
 147                 }
 148
 149                 srq->head    = 0;
 150                 srq->tail    = srq->msrq.max - 1;
 151                 srq->wqe_ctr = 0;
 152
 153                 for (i = 0; i < srq->msrq.max; ++i) {
 154                         next = get_wqe(srq, i);
 155                         next->next_wqe_index =
 156                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 157                 }
 158
 159                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 160                                     &srq->mtt);
 161                 if (err)
 162                         goto err_buf;
 163
 164                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 165                 if (err)
 166                         goto err_mtt;
 167
 168                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
 169                 if (!srq->wrid) {
 170                         err = -ENOMEM;
 171                         goto err_mtt;
 172                 }
 173         }
 174
 175         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
 176                              srq->db.dma, &srq->msrq);
 177         if (err)
 178                 goto err_wrid;
 179
 180         srq->msrq.event = mlx4_ib_srq_event;
 181
 182         if (pd->uobject)
 183                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 184                         err = -EFAULT;
 185                         goto err_wrid;
 186                 }
 187
 188         init_attr->attr.max_wr = srq->msrq.max - 1;
 189
 190         return &srq->ibsrq;
 191
 192 err_wrid:
 193         if (pd->uobject)
 194                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 195         else
 196                 kfree(srq->wrid);
 197
 198 err_mtt:
 199         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 200
 201 err_buf:
 202         if (pd->uobject)
 203                 ib_umem_release(srq->umem);
 204         else
 205                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 206
 207 err_db:
 208         if (!pd->uobject)
 209                 mlx4_ib_db_free(dev, &srq->db);
 210
 211 err_srq:
 212         kfree(srq);
 213
 214         return ERR_PTR(err);
 215 }
 216
 217 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 218                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 219 {
 220         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 221         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 222         int ret;
 223
 224         /* We don't support resizing SRQs (yet?) */
 225         if (attr_mask & IB_SRQ_MAX_WR)
 226                 return -EINVAL;
 227
 228         if (attr_mask & IB_SRQ_LIMIT) {
 229                 if (attr->srq_limit >= srq->msrq.max)
 230                         return -EINVAL;
 231
 232                 mutex_lock(&srq->mutex);
 233                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 234                 mutex_unlock(&srq->mutex);
 235
 236                 if (ret)
 237                         return ret;
 238         }
 239
 240         return 0;
 241 }
 242
 243 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 244 {
 245         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 246         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 247         int ret;
 248         int limit_watermark;
 249
 250         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 251         if (ret)
 252                 return ret;
 253
 254         srq_attr->srq_limit = limit_watermark;
 255         srq_attr->max_wr    = srq->msrq.max - 1;
 256         srq_attr->max_sge   = srq->msrq.max_gs;
 257
 258         return 0;
 259 }
 260
 261 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 262 {
 263         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 264         struct mlx4_ib_srq *msrq = to_msrq(srq);
 265
 266         mlx4_srq_free(dev->dev, &msrq->msrq);
 267         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 268
 269         if (srq->uobject) {
 270                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 271                 ib_umem_release(msrq->umem);
 272         } else {
 273                 kfree(msrq->wrid);
 274                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 275                               &msrq->buf);
 276                 mlx4_ib_db_free(dev, &msrq->db);
 277         }
 278
 279         kfree(msrq);
 280
 281         return 0;
 282 }
 283
 284 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 285 {
 286         struct mlx4_wqe_srq_next_seg *next;
 287
 288         /* always called with interrupts disabled. */
 289         spin_lock(&srq->lock);
 290
 291         next = get_wqe(srq, srq->tail);
 292         next->next_wqe_index = cpu_to_be16(wqe_index);
 293         srq->tail = wqe_index;
 294
 295         spin_unlock(&srq->lock);
 296 }
 297
 298 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 299                           struct ib_recv_wr **bad_wr)
 300 {
 301         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 302         struct mlx4_wqe_srq_next_seg *next;
 303         struct mlx4_wqe_data_seg *scat;
 304         unsigned long flags;
 305         int err = 0;
 306         int nreq;
 307         int i;
 308
 309         spin_lock_irqsave(&srq->lock, flags);
 310
 311         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 312                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 313                         err = -EINVAL;
 314                         *bad_wr = wr;
 315                         break;
 316                 }
 317
 318                 if (unlikely(srq->head == srq->tail)) {
 319                         err = -ENOMEM;
 320                         *bad_wr = wr;
 321                         break;
 322                 }
 323
 324                 srq->wrid[srq->head] = wr->wr_id;
 325
 326                 next      = get_wqe(srq, srq->head);
 327                 srq->head = be16_to_cpu(next->next_wqe_index);
 328                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 329
 330                 for (i = 0; i < wr->num_sge; ++i) {
 331                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 332                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 333                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 334                 }
 335
 336                 if (i < srq->msrq.max_gs) {
 337                         scat[i].byte_count = 0;
 338                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 339                         scat[i].addr       = 0;
 340                 }
 341         }
 342
 343         if (likely(nreq)) {
 344                 srq->wqe_ctr += nreq;
 345
 346                 /*
 347                  * Make sure that descriptors are written before
 348                  * doorbell record.
 349                  */
 350                 wmb();
 351
 352                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 353         }
 354
 355         spin_unlock_irqrestore(&srq->lock, flags);
 356
 357         return err;
 358 }