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