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
  37 #include "mlx4_ib.h"
  38 #include "user.h"
  39
  40 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
  41 {
  42         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  43 }
  44
  45 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  46 {
  47         struct ib_event event;
  48         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  49
  50         if (ibsrq->event_handler) {
  51                 event.device      = ibsrq->device;
  52                 event.element.srq = ibsrq;
  53                 switch (type) {
  54                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
  55                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  56                         break;
  57                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
  58                         event.event = IB_EVENT_SRQ_ERR;
  59                         break;
  60                 default:
  61                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
  62                                "on SRQ %06x\n", type, srq->srqn);
  63                         return;
  64                 }
  65
  66                 ibsrq->event_handler(&event, ibsrq->srq_context);
  67         }
  68 }
  69
  70 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
  71                                   struct ib_srq_init_attr *init_attr,
  72                                   struct ib_udata *udata)
  73 {
  74         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  75         struct mlx4_ib_srq *srq;
  76         struct mlx4_wqe_srq_next_seg *next;
  77         int desc_size;
  78         int buf_size;
  79         int err;
  80         int i;
  81
  82         /* Sanity check SRQ size before proceeding */
  83         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  84             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  85                 return ERR_PTR(-EINVAL);
  86
  87         srq = kmalloc(sizeof *srq, GFP_KERNEL);
  88         if (!srq)
  89                 return ERR_PTR(-ENOMEM);
  90
  91         mutex_init(&srq->mutex);
  92         spin_lock_init(&srq->lock);
  93         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
  94         srq->msrq.max_gs = init_attr->attr.max_sge;
  95
  96         desc_size = max(32UL,
  97                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
  98                                            srq->msrq.max_gs *
  99                                            sizeof (struct mlx4_wqe_data_seg)));
 100         srq->msrq.wqe_shift = ilog2(desc_size);
 101
 102         buf_size = srq->msrq.max * desc_size;
 103
 104         if (pd->uobject) {
 105                 struct mlx4_ib_create_srq ucmd;
 106
 107                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 108                         err = -EFAULT;
 109                         goto err_srq;
 110                 }
 111
 112                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 113                                         buf_size, 0, 0);
 114                 if (IS_ERR(srq->umem)) {
 115                         err = PTR_ERR(srq->umem);
 116                         goto err_srq;
 117                 }
 118
 119                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 120                                     ilog2(srq->umem->page_size), &srq->mtt);
 121                 if (err)
 122                         goto err_buf;
 123
 124                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 125                 if (err)
 126                         goto err_mtt;
 127
 128                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 129                                           ucmd.db_addr, &srq->db);
 130                 if (err)
 131                         goto err_mtt;
 132         } else {
 133                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 134                 if (err)
 135                         goto err_srq;
 136
 137                 *srq->db.db = 0;
 138
 139                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
 140                         err = -ENOMEM;
 141                         goto err_db;
 142                 }
 143
 144                 srq->head    = 0;
 145                 srq->tail    = srq->msrq.max - 1;
 146                 srq->wqe_ctr = 0;
 147
 148                 for (i = 0; i < srq->msrq.max; ++i) {
 149                         next = get_wqe(srq, i);
 150                         next->next_wqe_index =
 151                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 152                 }
 153
 154                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 155                                     &srq->mtt);
 156                 if (err)
 157                         goto err_buf;
 158
 159                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 160                 if (err)
 161                         goto err_mtt;
 162
 163                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
 164                 if (!srq->wrid) {
 165                         err = -ENOMEM;
 166                         goto err_mtt;
 167                 }
 168         }
 169
 170         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
 171                              srq->db.dma, &srq->msrq);
 172         if (err)
 173                 goto err_wrid;
 174
 175         srq->msrq.event = mlx4_ib_srq_event;
 176
 177         if (pd->uobject)
 178                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 179                         err = -EFAULT;
 180                         goto err_wrid;
 181                 }
 182
 183         init_attr->attr.max_wr = srq->msrq.max - 1;
 184
 185         return &srq->ibsrq;
 186
 187 err_wrid:
 188         if (pd->uobject)
 189                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 190         else
 191                 kfree(srq->wrid);
 192
 193 err_mtt:
 194         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 195
 196 err_buf:
 197         if (pd->uobject)
 198                 ib_umem_release(srq->umem);
 199         else
 200                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 201
 202 err_db:
 203         if (!pd->uobject)
 204                 mlx4_db_free(dev->dev, &srq->db);
 205
 206 err_srq:
 207         kfree(srq);
 208
 209         return ERR_PTR(err);
 210 }
 211
 212 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 213                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 214 {
 215         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 216         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 217         int ret;
 218
 219         /* We don't support resizing SRQs (yet?) */
 220         if (attr_mask & IB_SRQ_MAX_WR)
 221                 return -EINVAL;
 222
 223         if (attr_mask & IB_SRQ_LIMIT) {
 224                 if (attr->srq_limit >= srq->msrq.max)
 225                         return -EINVAL;
 226
 227                 mutex_lock(&srq->mutex);
 228                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 229                 mutex_unlock(&srq->mutex);
 230
 231                 if (ret)
 232                         return ret;
 233         }
 234
 235         return 0;
 236 }
 237
 238 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 239 {
 240         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 241         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 242         int ret;
 243         int limit_watermark;
 244
 245         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 246         if (ret)
 247                 return ret;
 248
 249         srq_attr->srq_limit = limit_watermark;
 250         srq_attr->max_wr    = srq->msrq.max - 1;
 251         srq_attr->max_sge   = srq->msrq.max_gs;
 252
 253         return 0;
 254 }
 255
 256 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 257 {
 258         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 259         struct mlx4_ib_srq *msrq = to_msrq(srq);
 260
 261         mlx4_srq_free(dev->dev, &msrq->msrq);
 262         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 263
 264         if (srq->uobject) {
 265                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 266                 ib_umem_release(msrq->umem);
 267         } else {
 268                 kfree(msrq->wrid);
 269                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 270                               &msrq->buf);
 271                 mlx4_db_free(dev->dev, &msrq->db);
 272         }
 273
 274         kfree(msrq);
 275
 276         return 0;
 277 }
 278
 279 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 280 {
 281         struct mlx4_wqe_srq_next_seg *next;
 282
 283         /* always called with interrupts disabled. */
 284         spin_lock(&srq->lock);
 285
 286         next = get_wqe(srq, srq->tail);
 287         next->next_wqe_index = cpu_to_be16(wqe_index);
 288         srq->tail = wqe_index;
 289
 290         spin_unlock(&srq->lock);
 291 }
 292
 293 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 294                           struct ib_recv_wr **bad_wr)
 295 {
 296         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 297         struct mlx4_wqe_srq_next_seg *next;
 298         struct mlx4_wqe_data_seg *scat;
 299         unsigned long flags;
 300         int err = 0;
 301         int nreq;
 302         int i;
 303
 304         spin_lock_irqsave(&srq->lock, flags);
 305
 306         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 307                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 308                         err = -EINVAL;
 309                         *bad_wr = wr;
 310                         break;
 311                 }
 312
 313                 if (unlikely(srq->head == srq->tail)) {
 314                         err = -ENOMEM;
 315                         *bad_wr = wr;
 316                         break;
 317                 }
 318
 319                 srq->wrid[srq->head] = wr->wr_id;
 320
 321                 next      = get_wqe(srq, srq->head);
 322                 srq->head = be16_to_cpu(next->next_wqe_index);
 323                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 324
 325                 for (i = 0; i < wr->num_sge; ++i) {
 326                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 327                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 328                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 329                 }
 330
 331                 if (i < srq->msrq.max_gs) {
 332                         scat[i].byte_count = 0;
 333                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 334                         scat[i].addr       = 0;
 335                 }
 336         }
 337
 338         if (likely(nreq)) {
 339                 srq->wqe_ctr += nreq;
 340
 341                 /*
 342                  * Make sure that descriptors are written before
 343                  * doorbell record.
 344                  */
 345                 wmb();
 346
 347                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 348         }
 349
 350         spin_unlock_irqrestore(&srq->lock, flags);
 351
 352         return err;
 353 }