mlx4_ib_srq.c

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    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 <dev/mlx4/qp.h>
   35 #include <dev/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 int mlx4_ib_create_srq(struct ib_srq *ib_srq,
   73                        struct ib_srq_init_attr *init_attr,
   74                        struct ib_udata *udata)
   75 {
   76         struct mlx4_ib_dev *dev = to_mdev(ib_srq->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 = to_msrq(ib_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 -EINVAL;
   93 
   94         mutex_init(&srq->mutex);
   95         spin_lock_init(&srq->lock);
   96         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
   97         srq->msrq.max_gs = init_attr->attr.max_sge;
   98 
   99         desc_size = max(32UL,
  100                         roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
  101                                            srq->msrq.max_gs *
  102                                            sizeof (struct mlx4_wqe_data_seg)));
  103         srq->msrq.wqe_shift = ilog2(desc_size);
  104 
  105         buf_size = srq->msrq.max * desc_size;
  106 
  107         if (udata) {
  108                 struct mlx4_ib_create_srq ucmd;
  109 
  110                 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)))
  111                         return -EFAULT;
  112 
  113                 srq->umem =
  114                         ib_umem_get(&ucontext->ibucontext, ucmd.buf_addr, buf_size, 0, 0);
  115                 if (IS_ERR(srq->umem))
  116                         return PTR_ERR(srq->umem);
  117 
  118                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
  119                                     ilog2(srq->umem->page_size), &srq->mtt);
  120                 if (err)
  121                         goto err_buf;
  122 
  123                 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
  124                 if (err)
  125                         goto err_mtt;
  126 
  127                 err = mlx4_ib_db_map_user(ucontext,
  128                                           ucmd.db_addr, &srq->db);
  129                 if (err)
  130                         goto err_mtt;
  131         } else {
  132                 err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL);
  133                 if (err)
  134                         return err;
  135 
  136                 *srq->db.db = 0;
  137 
  138                 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf,
  139                                    GFP_KERNEL)) {
  140                         err = -ENOMEM;
  141                         goto err_db;
  142                 }
  143 
  144                 srq->head    = 0;
  145                 srq->tail    = srq->msrq.max - 1;
  146                 srq->wqe_ctr = 0;
  147 
  148                 for (i = 0; i < srq->msrq.max; ++i) {
  149                         next = get_wqe(srq, i);
  150                         next->next_wqe_index =
  151                                 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
  152 
  153                         for (scatter = (void *) (next + 1);
  154                              (void *) scatter < (void *) next + desc_size;
  155                              ++scatter)
  156                                 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
  157                 }
  158 
  159                 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
  160                                     &srq->mtt);
  161                 if (err)
  162                         goto err_buf;
  163 
  164                 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
  165                 if (err)
  166                         goto err_mtt;
  167 
  168                 srq->wrid = kmalloc_array(srq->msrq.max, sizeof(u64),
  169                                         GFP_KERNEL | __GFP_NOWARN);
  170                 if (!srq->wrid) {
  171                         srq->wrid = __vmalloc(srq->msrq.max * sizeof(u64),
  172                                               GFP_KERNEL, 0 /*PAGE_KERNEL*/);
  173                         if (!srq->wrid) {
  174                                 err = -ENOMEM;
  175                                 goto err_mtt;
  176                         }
  177                 }
  178         }
  179 
  180         cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
  181                 to_mcq(init_attr->ext.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(ib_srq->pd)->pdn, cqn, xrcdn,
  186                              &srq->mtt, 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 (udata)
  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 0;
  202 
  203 err_wrid:
  204         if (udata)
  205                 mlx4_ib_db_unmap_user(ucontext, &srq->db);
  206         else
  207                 kvfree(srq->wrid);
  208 
  209 err_mtt:
  210         mlx4_mtt_cleanup(dev->dev, &srq->mtt);
  211 
  212 err_buf:
  213         if (!srq->umem)
  214                 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
  215         ib_umem_release(srq->umem);
  216 
  217 err_db:
  218         if (!udata)
  219                 mlx4_db_free(dev->dev, &srq->db);
  220 
  221         return err;
  222 }
  223 
  224 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
  225                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
  226 {
  227         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
  228         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
  229         int ret;
  230 
  231         /* We don't support resizing SRQs (yet?) */
  232         if (attr_mask & IB_SRQ_MAX_WR)
  233                 return -EINVAL;
  234 
  235         if (attr_mask & IB_SRQ_LIMIT) {
  236                 if (attr->srq_limit >= srq->msrq.max)
  237                         return -EINVAL;
  238 
  239                 mutex_lock(&srq->mutex);
  240                 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
  241                 mutex_unlock(&srq->mutex);
  242 
  243                 if (ret)
  244                         return ret;
  245         }
  246 
  247         return 0;
  248 }
  249 
  250 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
  251 {
  252         struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
  253         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
  254         int ret;
  255         int limit_watermark;
  256 
  257         ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
  258         if (ret)
  259                 return ret;
  260 
  261         srq_attr->srq_limit = limit_watermark;
  262         srq_attr->max_wr    = srq->msrq.max - 1;
  263         srq_attr->max_sge   = srq->msrq.max_gs;
  264 
  265         return 0;
  266 }
  267 
  268 void mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
  269 {
  270         struct mlx4_ib_dev *dev = to_mdev(srq->device);
  271         struct mlx4_ib_srq *msrq = to_msrq(srq);
  272 
  273         mlx4_srq_free(dev->dev, &msrq->msrq);
  274         mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
  275 
  276         if (udata) {
  277                 mlx4_ib_db_unmap_user(
  278                         rdma_udata_to_drv_context(
  279                                 udata,
  280                                 struct mlx4_ib_ucontext,
  281                                 ibucontext),
  282                         &msrq->db);
  283         } else {
  284                 kvfree(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         ib_umem_release(msrq->umem);
  290 }
  291 
  292 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
  293 {
  294         struct mlx4_wqe_srq_next_seg *next;
  295 
  296         /* always called with interrupts disabled. */
  297         spin_lock(&srq->lock);
  298 
  299         next = get_wqe(srq, srq->tail);
  300         next->next_wqe_index = cpu_to_be16(wqe_index);
  301         srq->tail = wqe_index;
  302 
  303         spin_unlock(&srq->lock);
  304 }
  305 
  306 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
  307                           const struct ib_recv_wr **bad_wr)
  308 {
  309         struct mlx4_ib_srq *srq = to_msrq(ibsrq);
  310         struct mlx4_wqe_srq_next_seg *next;
  311         struct mlx4_wqe_data_seg *scat;
  312         unsigned long flags;
  313         int err = 0;
  314         int nreq;
  315         int i;
  316         struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
  317 
  318         spin_lock_irqsave(&srq->lock, flags);
  319         if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
  320                 err = -EIO;
  321                 *bad_wr = wr;
  322                 nreq = 0;
  323                 goto out;
  324         }
  325 
  326         for (nreq = 0; wr; ++nreq, wr = wr->next) {
  327                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
  328                         err = -EINVAL;
  329                         *bad_wr = wr;
  330                         break;
  331                 }
  332 
  333                 if (unlikely(srq->head == srq->tail)) {
  334                         err = -ENOMEM;
  335                         *bad_wr = wr;
  336                         break;
  337                 }
  338 
  339                 srq->wrid[srq->head] = wr->wr_id;
  340 
  341                 next      = get_wqe(srq, srq->head);
  342                 srq->head = be16_to_cpu(next->next_wqe_index);
  343                 scat      = (struct mlx4_wqe_data_seg *) (next + 1);
  344 
  345                 for (i = 0; i < wr->num_sge; ++i) {
  346                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
  347                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
  348                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
  349                 }
  350 
  351                 if (i < srq->msrq.max_gs) {
  352                         scat[i].byte_count = 0;
  353                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
  354                         scat[i].addr       = 0;
  355                 }
  356         }
  357 
  358         if (likely(nreq)) {
  359                 srq->wqe_ctr += nreq;
  360 
  361                 /*
  362                  * Make sure that descriptors are written before
  363                  * doorbell record.
  364                  */
  365                 wmb();
  366 
  367                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
  368         }
  369 out:
  370 
  371         spin_unlock_irqrestore(&srq->lock, flags);
  372 
  373         return err;
  374 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx4/mlx4_ib/mlx4_ib_srq.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx4/mlx4_ib/mlx4_ib_srq.c
