sys/ofed/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_xrc_srq(struct ib_pd *pd,
  71                                       struct ib_cq *xrc_cq,
  72                                       struct ib_xrcd *xrcd,
  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_srq *srq;
  78         struct mlx4_wqe_srq_next_seg *next;
  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                 mlx4_ib_dbg("a size param is out of range. "
  90                             "max_wr = 0x%x, max_sge = 0x%x",
  91                             init_attr->attr.max_wr, init_attr->attr.max_sge);
  92                 return ERR_PTR(-EINVAL);
  93         }
  94
  95         srq = kzalloc(sizeof *srq, GFP_KERNEL);
  96         if (!srq)
  97                 return ERR_PTR(-ENOMEM);
  98
  99         mutex_init(&srq->mutex);
 100         spin_lock_init(&srq->lock);
 101         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 102         srq->msrq.max_gs = init_attr->attr.max_sge;
 103
 104         desc_size = max(32UL,
 105                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
 106                                            srq->msrq.max_gs *
 107                                            sizeof (struct mlx4_wqe_data_seg)));
 108         srq->msrq.wqe_shift = ilog2(desc_size);
 109
 110         buf_size = srq->msrq.max * desc_size;
 111
 112         if (pd->uobject) {
 113                 struct mlx4_ib_create_srq ucmd;
 114
 115                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 116                         err = -EFAULT;
 117                         goto err_srq;
 118                 }
 119
 120                 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 121                                         buf_size, 0, 0);
 122                 if (IS_ERR(srq->umem)) {
 123                         err = PTR_ERR(srq->umem);
 124                         goto err_srq;
 125                 }
 126
 127                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
 128                                     ilog2(srq->umem->page_size), &srq->mtt);
 129                 if (err)
 130                         goto err_buf;
 131
 132                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
 133                 if (err)
 134                         goto err_mtt;
 135
 136                 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 137                                           ucmd.db_addr, &srq->db);
 138                 if (err)
 139                         goto err_mtt;
 140         } else {
 141                 struct mlx4_wqe_data_seg *scatter;
 142
 143                 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
 144                 if (err)
 145                         goto err_srq;
 146
 147                 *srq->db.db = 0;
 148
 149                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
 150                         err = -ENOMEM;
 151                         goto err_db;
 152                 }
 153
 154                 srq->head    = 0;
 155                 srq->tail    = srq->msrq.max - 1;
 156                 srq->wqe_ctr = 0;
 157
 158                 for (i = 0; i < srq->msrq.max; ++i) {
 159                         next = get_wqe(srq, i);
 160                         next->next_wqe_index =
 161                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 162
 163                         for (scatter = (void *) (next + 1);
 164                              (void *) scatter < (void *) next + desc_size;
 165                              ++scatter)
 166                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
 167                 }
 168
 169                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
 170                                     &srq->mtt);
 171                 if (err)
 172                         goto err_buf;
 173
 174                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
 175                 if (err)
 176                         goto err_mtt;
 177
 178                 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
 179                 if (!srq->wrid) {
 180                         err = -ENOMEM;
 181                         goto err_mtt;
 182                 }
 183         }
 184
 185         cqn = xrc_cq ? (u32) (to_mcq(xrc_cq)->mcq.cqn) : 0;
 186         xrcdn = xrcd ? (u16) (to_mxrcd(xrcd)->xrcdn) :
 187                 (u16) dev->dev->caps.reserved_xrcds;
 188
 189         err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
 190                              srq->db.dma, &srq->msrq);
 191         if (err)
 192                 goto err_wrid;
 193
 194         srq->msrq.event = mlx4_ib_srq_event;
 195
 196         if (pd->uobject) {
 197                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
 198                         err = -EFAULT;
 199                         goto err_wrid;
 200                 }
 201         } else
 202                 srq->ibsrq.xrc_srq_num = srq->msrq.srqn;
 203
 204         init_attr->attr.max_wr = srq->msrq.max - 1;
 205
 206         return &srq->ibsrq;
 207
 208 err_wrid:
 209         if (pd->uobject)
 210                 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 211         else
 212                 kfree(srq->wrid);
 213
 214 err_mtt:
 215         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
 216
 217 err_buf:
 218         if (pd->uobject)
 219                 ib_umem_release(srq->umem);
 220         else
 221                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
 222
 223 err_db:
 224         if (!pd->uobject)
 225                 mlx4_db_free(dev->dev, &srq->db);
 226
 227 err_srq:
 228         kfree(srq);
 229
 230         return ERR_PTR(err);
 231 }
 232
 233 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 234                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 235 {
 236         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 237         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 238         int ret;
 239
 240         /* We don't support resizing SRQs (yet?) */
 241         if (attr_mask & IB_SRQ_MAX_WR) {
 242                 mlx4_ib_dbg("resize not yet supported");
 243                 return -EINVAL;
 244         }
 245
 246         if (attr_mask & IB_SRQ_LIMIT) {
 247                 if (attr->srq_limit >= srq->msrq.max){
 248                         mlx4_ib_dbg("limit (0x%x) too high", attr->srq_limit);
 249                         return -EINVAL;
 250                 }
 251
 252                 mutex_lock(&srq->mutex);
 253                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
 254                 mutex_unlock(&srq->mutex);
 255
 256                 if (ret)
 257                         return ret;
 258         }
 259
 260         return 0;
 261 }
 262
 263 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
 264                                   struct ib_srq_init_attr *init_attr,
 265                                   struct ib_udata *udata)
 266 {
 267         return mlx4_ib_create_xrc_srq(pd, NULL, NULL, init_attr, udata);
 268 }
 269
 270 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 271 {
 272         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
 273         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 274         int ret;
 275         int limit_watermark;
 276
 277         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
 278         if (ret)
 279                 return ret;
 280
 281         srq_attr->srq_limit = limit_watermark;
 282         srq_attr->max_wr    = srq->msrq.max - 1;
 283         srq_attr->max_sge   = srq->msrq.max_gs;
 284
 285         return 0;
 286 }
 287
 288 int mlx4_ib_destroy_srq(struct ib_srq *srq)
 289 {
 290         struct mlx4_ib_dev *dev = to_mdev(srq->device);
 291         struct mlx4_ib_srq *msrq = to_msrq(srq);
 292         struct mlx4_ib_cq *cq;
 293
 294         mlx4_srq_invalidate(dev->dev, &msrq->msrq);
 295
 296         if (srq->xrc_cq && !srq->uobject) {
 297                 cq = to_mcq(srq->xrc_cq);
 298                 spin_lock_irq(&cq->lock);
 299                 __mlx4_ib_cq_clean(cq, -1, msrq);
 300                 mlx4_srq_remove(dev->dev, &msrq->msrq);
 301                 spin_unlock_irq(&cq->lock);
 302         } else
 303                 mlx4_srq_remove(dev->dev, &msrq->msrq);
 304
 305         mlx4_srq_free(dev->dev, &msrq->msrq);
 306         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
 307
 308         if (srq->uobject) {
 309                 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 310                 ib_umem_release(msrq->umem);
 311         } else {
 312                 kfree(msrq->wrid);
 313                 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
 314                               &msrq->buf);
 315                 mlx4_db_free(dev->dev, &msrq->db);
 316         }
 317
 318         kfree(msrq);
 319
 320         return 0;
 321 }
 322
 323 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
 324 {
 325         struct mlx4_wqe_srq_next_seg *next;
 326
 327         /* always called with interrupts disabled. */
 328         spin_lock(&srq->lock);
 329
 330         next = get_wqe(srq, srq->tail);
 331         next->next_wqe_index = cpu_to_be16(wqe_index);
 332         srq->tail = wqe_index;
 333
 334         spin_unlock(&srq->lock);
 335 }
 336
 337 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 338                           struct ib_recv_wr **bad_wr)
 339 {
 340         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
 341         struct mlx4_wqe_srq_next_seg *next;
 342         struct mlx4_wqe_data_seg *scat;
 343         unsigned long flags;
 344         int err = 0;
 345         int nreq;
 346         int i;
 347
 348         spin_lock_irqsave(&srq->lock, flags);
 349
 350         for (nreq = 0; wr; ++nreq, wr = wr->next) {
 351                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 352                         mlx4_ib_dbg("srq num 0x%x: num s/g entries too large (%d)",
 353                                     srq->msrq.srqn, wr->num_sge);
 354                         err = -EINVAL;
 355                         *bad_wr = wr;
 356                         break;
 357                 }
 358
 359                 if (unlikely(srq->head == srq->tail)) {
 360                         mlx4_ib_dbg("srq num 0x%x: No entries available to post.",
 361                                     srq->msrq.srqn);
 362                         err = -ENOMEM;
 363                         *bad_wr = wr;
 364                         break;
 365                 }
 366
 367                 srq->wrid[srq->head] = wr->wr_id;
 368
 369                 next      = get_wqe(srq, srq->head);
 370                 srq->head = be16_to_cpu(next->next_wqe_index);
 371                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
 372
 373                 for (i = 0; i < wr->num_sge; ++i) {
 374                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 375                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 376                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 377                 }
 378
 379                 if (i < srq->msrq.max_gs) {
 380                         scat[i].byte_count = 0;
 381                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
 382                         scat[i].addr       = 0;
 383                 }
 384         }
 385
 386         if (likely(nreq)) {
 387                 srq->wqe_ctr += nreq;
 388
 389                 /*
 390                  * Make sure that descriptors are written before
 391                  * doorbell record.
 392                  */
 393                 wmb();
 394
 395                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 396         }
 397
 398         spin_unlock_irqrestore(&srq->lock, flags);
 399
 400         return err;
 401 }