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                         pr_warn("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, GFP_KERNEL);
 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                                    GFP_KERNEL)) {
 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                         for (scatter = (void *) (next + 1);
 159                              (void *) scatter < (void *) next + desc_size;
 160                              ++scatter)
 161                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 162                 }
 163
 164                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 165                                     &srq->mtt);
 166                 if (err)
 167                         goto err_buf;
 168
 169                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
 170                 if (err)
 171                         goto err_mtt;
 172
 173                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
 174                 if (!srq->wrid) {
 175                         err = -ENOMEM;
 176                         goto err_mtt;
 177                 }
 178         }
 179
 180         cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
 181                 to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
 182         xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
 183                 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
 184                 (u16) dev->dev->caps.reserved_xrcds;
 185         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
 186                              srq->db.dma, &srq->msrq);
 187         if (err)
 188                 goto err_wrid;
 189
 190         srq->msrq.event = mlx4_ib_srq_event;
 191         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 192
 193         if (pd->uobject)
 194                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 195                         err = -EFAULT;
 196                         goto err_wrid;
 197                 }
 198
 199         init_attr->attr.max_wr = srq->msrq.max - 1;
 200
 201         return &srq->ibsrq;
 202
 203 err_wrid:
 204         if (pd->uobject)
 205                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 206         else
 207                 kfree(srq->wrid);
 208
 209 err_mtt:
 210         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 211
 212 err_buf:
 213         if (pd->uobject)
 214                 ib_umem_release(srq->umem);
 215         else
 216                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 217
 218 err_db:
 219         if (!pd->uobject)
 220                 mlx4_db_free(dev->dev, &srq->db);
 221
 222 err_srq:
 223         kfree(srq);
 224
 225         return ERR_PTR(err);
 226 }
 227
 228 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 229                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 230 {
 231         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 232         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 233         int ret;
 234
 235         /* We don't support resizing SRQs (yet?) */
 236         if (attr_mask & IB_SRQ_MAX_WR)
 237                 return -EINVAL;
 238
 239         if (attr_mask & IB_SRQ_LIMIT) {
 240                 if (attr->srq_limit >= srq->msrq.max)
 241                         return -EINVAL;
 242
 243                 mutex_lock(&srq->mutex);
 244                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 245                 mutex_unlock(&srq->mutex);
 246
 247                 if (ret)
 248                         return ret;
 249         }
 250
 251         return 0;
 252 }
 253
 254 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 255 {
 256         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 257         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 258         int ret;
 259         int limit_watermark;
 260
 261         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 262         if (ret)
 263                 return ret;
 264
 265         srq_attr->srq_limit = limit_watermark;
 266         srq_attr->max_wr    = srq->msrq.max - 1;
 267         srq_attr->max_sge   = srq->msrq.max_gs;
 268
 269         return 0;
 270 }
 271
 272 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 273 {
 274         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 275         struct mlx4_ib_srq *msrq = to_msrq(srq);
 276
 277         mlx4_srq_free(dev->dev, &msrq->msrq);
 278         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 279
 280         if (srq->uobject) {
 281                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 282                 ib_umem_release(msrq->umem);
 283         } else {
 284                 kfree(msrq->wrid);
 285                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 286                               &msrq->buf);
 287                 mlx4_db_free(dev->dev, &msrq->db);
 288         }
 289
 290         kfree(msrq);
 291
 292         return 0;
 293 }
 294
 295 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 296 {
 297         struct mlx4_wqe_srq_next_seg *next;
 298
 299         /* always called with interrupts disabled. */
 300         spin_lock(&srq->lock);
 301
 302         next = get_wqe(srq, srq->tail);
 303         next->next_wqe_index = cpu_to_be16(wqe_index);
 304         srq->tail = wqe_index;
 305
 306         spin_unlock(&srq->lock);
 307 }
 308
 309 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 310                           struct ib_recv_wr **bad_wr)
 311 {
 312         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 313         struct mlx4_wqe_srq_next_seg *next;
 314         struct mlx4_wqe_data_seg *scat;
 315         unsigned long flags;
 316         int err = 0;
 317         int nreq;
 318         int i;
 319
 320         spin_lock_irqsave(&srq->lock, flags);
 321
 322         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 323                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 324                         err = -EINVAL;
 325                         *bad_wr = wr;
 326                         break;
 327                 }
 328
 329                 if (unlikely(srq->head == srq->tail)) {
 330                         err = -ENOMEM;
 331                         *bad_wr = wr;
 332                         break;
 333                 }
 334
 335                 srq->wrid[srq->head] = wr->wr_id;
 336
 337                 next      = get_wqe(srq, srq->head);
 338                 srq->head = be16_to_cpu(next->next_wqe_index);
 339                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 340
 341                 for (i = 0; i < wr->num_sge; ++i) {
 342                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 343                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 344                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 345                 }
 346
 347                 if (i < srq->msrq.max_gs) {
 348                         scat[i].byte_count = 0;
 349                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 350                         scat[i].addr       = 0;
 351                 }
 352         }
 353
 354         if (likely(nreq)) {
 355                 srq->wqe_ctr += nreq;
 356
 357                 /*
 358                  * Make sure that descriptors are written before
 359                  * doorbell record.
 360                  */
 361                 wmb();
 362
 363                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 364         }
 365
 366         spin_unlock_irqrestore(&srq->lock, flags);
 367
 368         return err;
 369 }