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 <rdma/mlx4-abi.h>
  40 #include <rdma/uverbs_ioctl.h>
  41
  42 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
  43 {
  44         return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  45 }
  46
  47 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
  48 {
  49         struct ib_event event;
  50         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  51
  52         if (ibsrq->event_handler) {
  53                 event.device      = ibsrq->device;
  54                 event.element.srq = ibsrq;
  55                 switch (type) {
  56                 case MLX4_EVENT_TYPE_SRQ_LIMIT:
  57                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  58                         break;
  59                 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
  60                         event.event = IB_EVENT_SRQ_ERR;
  61                         break;
  62                 default:
  63                         pr_warn("Unexpected event type %d "
  64                                "on SRQ %06x\n", type, srq->srqn);
  65                         return;
  66                 }
  67
  68                 ibsrq->event_handler(&event, ibsrq->srq_context);
  69         }
  70 }
  71
  72 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
  73                                   struct ib_srq_init_attr *init_attr,
  74                                   struct ib_udata *udata)
  75 {
  76         struct mlx4_ib_dev *dev = to_mdev(pd->device);
  77         struct mlx4_ib_ucontext *ucontext = rdma_udata_to_drv_context(
  78                 udata, struct mlx4_ib_ucontext, ibucontext);
  79         struct mlx4_ib_srq *srq;
  80         struct mlx4_wqe_srq_next_seg *next;
  81         struct mlx4_wqe_data_seg *scatter;
  82         u32 cqn;
  83         u16 xrcdn;
  84         int desc_size;
  85         int buf_size;
  86         int err;
  87         int i;
  88
  89         /* Sanity check SRQ size before proceeding */
  90         if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
  91             init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
  92                 return ERR_PTR(-EINVAL);
  93
  94         srq = kmalloc(sizeof *srq, GFP_KERNEL);
  95         if (!srq)
  96                 return ERR_PTR(-ENOMEM);
  97
  98         mutex_init(&srq->mutex);
  99         spin_lock_init(&srq->lock);
 100         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 101         srq->msrq.max_gs = init_attr->attr.max_sge;
 102
 103         desc_size = max(32UL,
 104                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
 105                                            srq->msrq.max_gs *
 106                                            sizeof (struct mlx4_wqe_data_seg)));
 107         srq->msrq.wqe_shift = ilog2(desc_size);
 108
 109         buf_size = srq->msrq.max * desc_size;
 110
 111         if (udata) {
 112                 struct mlx4_ib_create_srq ucmd;
 113
 114                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 115                         err = -EFAULT;
 116                         goto err_srq;
 117                 }
 118
 119                 srq->umem = ib_umem_get(udata, ucmd.buf_addr, buf_size, 0, 0);
 120                 if (IS_ERR(srq->umem)) {
 121                         err = PTR_ERR(srq->umem);
 122                         goto err_srq;
 123                 }
 124
 125                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 126                                     srq->umem->page_shift, &srq->mtt);
 127                 if (err)
 128                         goto err_buf;
 129
 130                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 131                 if (err)
 132                         goto err_mtt;
 133
 134                 err = mlx4_ib_db_map_user(ucontext, udata, ucmd.db_addr,
 135                                           &srq->db);
 136                 if (err)
 137                         goto err_mtt;
 138         } else {
 139                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 140                 if (err)
 141                         goto err_srq;
 142
 143                 *srq->db.db = 0;
 144
 145                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2,
 146                                    &srq->buf)) {
 147                         err = -ENOMEM;
 148                         goto err_db;
 149                 }
 150
 151                 srq->head    = 0;
 152                 srq->tail    = srq->msrq.max - 1;
 153                 srq->wqe_ctr = 0;
 154
 155                 for (i = 0; i < srq->msrq.max; ++i) {
 156                         next = get_wqe(srq, i);
 157                         next->next_wqe_index =
 158                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 159
 160                         for (scatter = (void *) (next + 1);
 161                              (void *) scatter < (void *) next + desc_size;
 162                              ++scatter)
 163                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 164                 }
 165
 166                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 167                                     &srq->mtt);
 168                 if (err)
 169                         goto err_buf;
 170
 171                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 172                 if (err)
 173                         goto err_mtt;
 174
 175                 srq->wrid = kvmalloc_array(srq->msrq.max,
 176                                            sizeof(u64), GFP_KERNEL);
 177                 if (!srq->wrid) {
 178                         err = -ENOMEM;
 179                         goto err_mtt;
 180                 }
 181         }
 182
 183         cqn = ib_srq_has_cq(init_attr->srq_type) ?
 184                 to_mcq(init_attr->ext.cq)->mcq.cqn : 0;
 185         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
 186                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
 187                 (u16) dev->dev->caps.reserved_xrcds;
 188         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
 189                              srq->db.dma, &srq->msrq);
 190         if (err)
 191                 goto err_wrid;
 192
 193         srq->msrq.event = mlx4_ib_srq_event;
 194         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 195
 196         if (udata)
 197                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 198                         err = -EFAULT;
 199                         goto err_wrid;
 200                 }
 201
 202         init_attr->attr.max_wr = srq->msrq.max - 1;
 203
 204         return &srq->ibsrq;
 205
 206 err_wrid:
 207         if (udata)
 208                 mlx4_ib_db_unmap_user(ucontext, &srq->db);
 209         else
 210                 kvfree(srq->wrid);
 211
 212 err_mtt:
 213         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 214
 215 err_buf:
 216         if (srq->umem)
 217                 ib_umem_release(srq->umem);
 218         else
 219                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 220
 221 err_db:
 222         if (!udata)
 223                 mlx4_db_free(dev->dev, &srq->db);
 224
 225 err_srq:
 226         kfree(srq);
 227
 228         return ERR_PTR(err);
 229 }
 230
 231 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 232                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 233 {
 234         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 235         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 236         int ret;
 237
 238         /* We don't support resizing SRQs (yet?) */
 239         if (attr_mask & IB_SRQ_MAX_WR)
 240                 return -EINVAL;
 241
 242         if (attr_mask & IB_SRQ_LIMIT) {
 243                 if (attr->srq_limit >= srq->msrq.max)
 244                         return -EINVAL;
 245
 246                 mutex_lock(&srq->mutex);
 247                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 248                 mutex_unlock(&srq->mutex);
 249
 250                 if (ret)
 251                         return ret;
 252         }
 253
 254         return 0;
 255 }
 256
 257 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 258 {
 259         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 260         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 261         int ret;
 262         int limit_watermark;
 263
 264         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 265         if (ret)
 266                 return ret;
 267
 268         srq_attr->srq_limit = limit_watermark;
 269         srq_attr->max_wr    = srq->msrq.max - 1;
 270         srq_attr->max_sge   = srq->msrq.max_gs;
 271
 272         return 0;
 273 }
 274
 275 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 276 {
 277         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 278         struct mlx4_ib_srq *msrq = to_msrq(srq);
 279
 280         mlx4_srq_free(dev->dev, &msrq->msrq);
 281         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 282
 283         if (srq->uobject) {
 284                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 285                 ib_umem_release(msrq->umem);
 286         } else {
 287                 kvfree(msrq->wrid);
 288                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 289                               &msrq->buf);
 290                 mlx4_db_free(dev->dev, &msrq->db);
 291         }
 292
 293         kfree(msrq);
 294
 295         return 0;
 296 }
 297
 298 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 299 {
 300         struct mlx4_wqe_srq_next_seg *next;
 301
 302         /* always called with interrupts disabled. */
 303         spin_lock(&srq->lock);
 304
 305         next = get_wqe(srq, srq->tail);
 306         next->next_wqe_index = cpu_to_be16(wqe_index);
 307         srq->tail = wqe_index;
 308
 309         spin_unlock(&srq->lock);
 310 }
 311
 312 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 313                           const struct ib_recv_wr **bad_wr)
 314 {
 315         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 316         struct mlx4_wqe_srq_next_seg *next;
 317         struct mlx4_wqe_data_seg *scat;
 318         unsigned long flags;
 319         int err = 0;
 320         int nreq;
 321         int i;
 322         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
 323
 324         spin_lock_irqsave(&srq->lock, flags);
 325         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
 326                 err = -EIO;
 327                 *bad_wr = wr;
 328                 nreq = 0;
 329                 goto out;
 330         }
 331
 332         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 333                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 334                         err = -EINVAL;
 335                         *bad_wr = wr;
 336                         break;
 337                 }
 338
 339                 if (unlikely(srq->head == srq->tail)) {
 340                         err = -ENOMEM;
 341                         *bad_wr = wr;
 342                         break;
 343                 }
 344
 345                 srq->wrid[srq->head] = wr->wr_id;
 346
 347                 next      = get_wqe(srq, srq->head);
 348                 srq->head = be16_to_cpu(next->next_wqe_index);
 349                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 350
 351                 for (i = 0; i < wr->num_sge; ++i) {
 352                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 353                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 354                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 355                 }
 356
 357                 if (i < srq->msrq.max_gs) {
 358                         scat[i].byte_count = 0;
 359                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 360                         scat[i].addr       = 0;
 361                 }
 362         }
 363
 364         if (likely(nreq)) {
 365                 srq->wqe_ctr += nreq;
 366
 367                 /*
 368                  * Make sure that descriptors are written before
 369                  * doorbell record.
 370                  */
 371                 wmb();
 372
 373                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 374         }
 375 out:
 376
 377         spin_unlock_irqrestore(&srq->lock, flags);
 378
 379         return err;
 380 }