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