mlx5_ib_srq.c

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    1 /*-
    2  * Copyright (c) 2013-2020, Mellanox Technologies, Ltd.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 #include "opt_rss.h"
   29 #include "opt_ratelimit.h"
   30 
   31 #include <linux/module.h>
   32 #include <dev/mlx5/qp.h>
   33 #include <dev/mlx5/srq.h>
   34 #include <linux/slab.h>
   35 #include <rdma/ib_umem.h>
   36 #include <rdma/ib_user_verbs.h>
   37 #include <rdma/uverbs_ioctl.h>
   38 
   39 #include <dev/mlx5/mlx5_ib/mlx5_ib.h>
   40 
   41 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
   42 {
   43         return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
   44 }
   45 
   46 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, int 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 MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
   56                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
   57                         break;
   58                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
   59                         event.event = IB_EVENT_SRQ_ERR;
   60                         break;
   61                 default:
   62                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
   63                                 type, srq->srqn);
   64                         return;
   65                 }
   66 
   67                 ibsrq->event_handler(&event, ibsrq->srq_context);
   68         }
   69 }
   70 
   71 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
   72                            struct mlx5_srq_attr *in,
   73                            struct ib_udata *udata, int buf_size)
   74 {
   75         struct mlx5_ib_dev *dev = to_mdev(pd->device);
   76         struct mlx5_ib_create_srq ucmd = {};
   77         struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
   78                 udata, struct mlx5_ib_ucontext, ibucontext);
   79         size_t ucmdlen;
   80         int err;
   81         int npages;
   82         int page_shift;
   83         int ncont;
   84         u32 offset;
   85         u32 uidx = MLX5_IB_DEFAULT_UIDX;
   86 
   87         ucmdlen = min(udata->inlen, sizeof(ucmd));
   88 
   89         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
   90                 mlx5_ib_dbg(dev, "failed copy udata\n");
   91                 return -EFAULT;
   92         }
   93 
   94         if (ucmd.reserved0 || ucmd.reserved1)
   95                 return -EINVAL;
   96 
   97         if (udata->inlen > sizeof(ucmd) &&
   98             !ib_is_udata_cleared(udata, sizeof(ucmd),
   99                                  udata->inlen - sizeof(ucmd)))
  100                 return -EINVAL;
  101 
  102         if (in->type != IB_SRQT_BASIC) {
  103                 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
  104                 if (err)
  105                         return err;
  106         }
  107 
  108         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
  109 
  110         srq->umem = ib_umem_get(&ucontext->ibucontext, ucmd.buf_addr, buf_size, 0, 0);
  111         if (IS_ERR(srq->umem)) {
  112                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
  113                 err = PTR_ERR(srq->umem);
  114                 return err;
  115         }
  116 
  117         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages,
  118                            &page_shift, &ncont, NULL);
  119         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
  120                                      &offset);
  121         if (err) {
  122                 mlx5_ib_warn(dev, "bad offset\n");
  123                 goto err_umem;
  124         }
  125 
  126         in->pas = mlx5_vzalloc(sizeof(*in->pas) * ncont);
  127         if (!in->pas) {
  128                 err = -ENOMEM;
  129                 goto err_umem;
  130         }
  131 
  132         mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
  133 
  134         err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);
  135         if (err) {
  136                 mlx5_ib_dbg(dev, "map doorbell failed\n");
  137                 goto err_in;
  138         }
  139 
  140         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
  141         in->page_offset = offset;
  142         in->uid = (in->type != IB_SRQT_XRC) ?  to_mpd(pd)->uid : 0;
  143         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
  144             in->type != IB_SRQT_BASIC)
  145                 in->user_index = uidx;
  146 
  147         return 0;
  148 
  149 err_in:
  150         kvfree(in->pas);
  151 
  152 err_umem:
  153         ib_umem_release(srq->umem);
  154 
  155         return err;
  156 }
  157 
  158 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
  159                              struct mlx5_srq_attr *in, int buf_size)
  160 {
  161         int err;
  162         int i;
  163         struct mlx5_wqe_srq_next_seg *next;
  164 
  165         err = mlx5_db_alloc(dev->mdev, &srq->db);
  166         if (err) {
  167                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
  168                 return err;
  169         }
  170 
  171         if (mlx5_buf_alloc(dev->mdev, buf_size, 2 * PAGE_SIZE, &srq->buf)) {
  172                 mlx5_ib_dbg(dev, "buf alloc failed\n");
  173                 err = -ENOMEM;
  174                 goto err_db;
  175         }
  176 
  177         srq->head    = 0;
  178         srq->tail    = srq->msrq.max - 1;
  179         srq->wqe_ctr = 0;
  180 
  181         for (i = 0; i < srq->msrq.max; i++) {
  182                 next = get_wqe(srq, i);
  183                 next->next_wqe_index =
  184                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
  185         }
  186 
  187         mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
  188         in->pas = mlx5_vzalloc(sizeof(*in->pas) * srq->buf.npages);
  189         if (!in->pas) {
  190                 err = -ENOMEM;
  191                 goto err_buf;
  192         }
  193         mlx5_fill_page_array(&srq->buf, in->pas);
  194 
  195         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
  196         if (!srq->wrid) {
  197                 err = -ENOMEM;
  198                 goto err_in;
  199         }
  200         srq->wq_sig = 0;
  201 
  202         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
  203         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
  204             in->type != IB_SRQT_BASIC)
  205                 in->user_index = MLX5_IB_DEFAULT_UIDX;
  206 
  207         return 0;
  208 
  209 err_in:
  210         kvfree(in->pas);
  211 
  212 err_buf:
  213         mlx5_buf_free(dev->mdev, &srq->buf);
  214 
  215 err_db:
  216         mlx5_db_free(dev->mdev, &srq->db);
  217         return err;
  218 }
  219 
  220 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
  221                              struct ib_udata *udata)
  222 {
  223         mlx5_ib_db_unmap_user(
  224                 rdma_udata_to_drv_context(
  225                         udata,
  226                         struct mlx5_ib_ucontext,
  227                         ibucontext),
  228                 &srq->db);
  229         ib_umem_release(srq->umem);
  230 }
  231 
  232 
  233 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
  234 {
  235         kfree(srq->wrid);
  236         mlx5_buf_free(dev->mdev, &srq->buf);
  237         mlx5_db_free(dev->mdev, &srq->db);
  238 }
  239 
  240 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
  241                        struct ib_srq_init_attr *init_attr,
  242                        struct ib_udata *udata)
  243 {
  244         struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
  245         struct mlx5_ib_srq *srq = to_msrq(ib_srq);
  246         size_t desc_size;
  247         size_t buf_size;
  248         int err;
  249         struct mlx5_srq_attr in = {};
  250         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
  251 
  252         /* Sanity check SRQ size before proceeding */
  253         if (init_attr->attr.max_wr >= max_srq_wqes) {
  254                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
  255                             init_attr->attr.max_wr,
  256                             max_srq_wqes);
  257                 return -EINVAL;
  258         }
  259 
  260         mutex_init(&srq->mutex);
  261         spin_lock_init(&srq->lock);
  262         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
  263         srq->msrq.max_gs = init_attr->attr.max_sge;
  264 
  265         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
  266                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
  267         if (desc_size == 0 || srq->msrq.max_gs > desc_size)
  268                 return -EINVAL;
  269 
  270         desc_size = roundup_pow_of_two(desc_size);
  271         desc_size = max_t(size_t, 32, desc_size);
  272         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
  273                 return -EINVAL;
  274 
  275         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
  276                 sizeof(struct mlx5_wqe_data_seg);
  277         srq->msrq.wqe_shift = ilog2(desc_size);
  278         buf_size = srq->msrq.max * desc_size;
  279         if (buf_size < desc_size)
  280                 return -EINVAL;
  281 
  282         in.type = init_attr->srq_type;
  283 
  284         if (udata)
  285                 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
  286         else
  287                 err = create_srq_kernel(dev, srq, &in, buf_size);
  288 
  289         if (err) {
  290                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
  291                              udata ? "user" : "kernel", err);
  292                 return err;
  293         }
  294 
  295         in.log_size = ilog2(srq->msrq.max);
  296         in.wqe_shift = srq->msrq.wqe_shift - 4;
  297         if (srq->wq_sig)
  298                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
  299 
  300         if (init_attr->srq_type == IB_SRQT_XRC)
  301                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
  302         else
  303                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
  304 
  305         if (ib_srq_has_cq(init_attr->srq_type))
  306                 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
  307         else
  308                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
  309 
  310         in.pd = to_mpd(ib_srq->pd)->pdn;
  311         in.db_record = srq->db.dma;
  312         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
  313         kvfree(in.pas);
  314         if (err) {
  315                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
  316                 goto err_usr_kern_srq;
  317         }
  318 
  319         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
  320 
  321         srq->msrq.event = mlx5_ib_srq_event;
  322         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
  323 
  324         if (udata)
  325                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
  326                         mlx5_ib_dbg(dev, "copy to user failed\n");
  327                         err = -EFAULT;
  328                         goto err_core;
  329                 }
  330 
  331         init_attr->attr.max_wr = srq->msrq.max - 1;
  332 
  333         return 0;
  334 
  335 err_core:
  336         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
  337 
  338 err_usr_kern_srq:
  339         if (udata)
  340                 destroy_srq_user(ib_srq->pd, srq, udata);
  341         else
  342                 destroy_srq_kernel(dev, srq);
  343 
  344         return err;
  345 }
  346 
  347 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
  348                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
  349 {
  350         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
  351         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
  352         int ret;
  353 
  354         /* We don't support resizing SRQs yet */
  355         if (attr_mask & IB_SRQ_MAX_WR)
  356                 return -EINVAL;
  357 
  358         if (attr_mask & IB_SRQ_LIMIT) {
  359                 if (attr->srq_limit >= srq->msrq.max)
  360                         return -EINVAL;
  361 
  362                 mutex_lock(&srq->mutex);
  363                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
  364                 mutex_unlock(&srq->mutex);
  365 
  366                 if (ret)
  367                         return ret;
  368         }
  369 
  370         return 0;
  371 }
  372 
  373 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
  374 {
  375         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
  376         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
  377         int ret;
  378         struct mlx5_srq_attr *out;
  379 
  380         out = kzalloc(sizeof(*out), GFP_KERNEL);
  381         if (!out)
  382                 return -ENOMEM;
  383 
  384         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
  385         if (ret)
  386                 goto out_box;
  387 
  388         srq_attr->srq_limit = out->lwm;
  389         srq_attr->max_wr    = srq->msrq.max - 1;
  390         srq_attr->max_sge   = srq->msrq.max_gs;
  391 
  392 out_box:
  393         kfree(out);
  394         return ret;
  395 }
  396 
  397 void mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
  398 {
  399         struct mlx5_ib_dev *dev = to_mdev(srq->device);
  400         struct mlx5_ib_srq *msrq = to_msrq(srq);
  401 
  402         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
  403 
  404         if (srq->uobject) {
  405                 mlx5_ib_db_unmap_user(
  406                         rdma_udata_to_drv_context(
  407                                 udata,
  408                                 struct mlx5_ib_ucontext,
  409                                 ibucontext),
  410                         &msrq->db);
  411                 ib_umem_release(msrq->umem);
  412         } else {
  413                 destroy_srq_kernel(dev, msrq);
  414         }
  415 }
  416 
  417 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
  418 {
  419         struct mlx5_wqe_srq_next_seg *next;
  420 
  421         /* always called with interrupts disabled. */
  422         spin_lock(&srq->lock);
  423 
  424         next = get_wqe(srq, srq->tail);
  425         next->next_wqe_index = cpu_to_be16(wqe_index);
  426         srq->tail = wqe_index;
  427 
  428         spin_unlock(&srq->lock);
  429 }
  430 
  431 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
  432                           const struct ib_recv_wr **bad_wr)
  433 {
  434         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
  435         struct mlx5_wqe_srq_next_seg *next;
  436         struct mlx5_wqe_data_seg *scat;
  437         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
  438         struct mlx5_core_dev *mdev = dev->mdev;
  439         unsigned long flags;
  440         int err = 0;
  441         int nreq;
  442         int i;
  443 
  444         spin_lock_irqsave(&srq->lock, flags);
  445 
  446         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
  447                 err = -EIO;
  448                 *bad_wr = wr;
  449                 goto out;
  450         }
  451 
  452         for (nreq = 0; wr; nreq++, wr = wr->next) {
  453                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
  454                         err = -EINVAL;
  455                         *bad_wr = wr;
  456                         break;
  457                 }
  458 
  459                 if (unlikely(srq->head == srq->tail)) {
  460                         err = -ENOMEM;
  461                         *bad_wr = wr;
  462                         break;
  463                 }
  464 
  465                 srq->wrid[srq->head] = wr->wr_id;
  466 
  467                 next      = get_wqe(srq, srq->head);
  468                 srq->head = be16_to_cpu(next->next_wqe_index);
  469                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
  470 
  471                 for (i = 0; i < wr->num_sge; i++) {
  472                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
  473                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
  474                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
  475                 }
  476 
  477                 if (i < srq->msrq.max_avail_gather) {
  478                         scat[i].byte_count = 0;
  479                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
  480                         scat[i].addr       = 0;
  481                 }
  482         }
  483 
  484         if (likely(nreq)) {
  485                 srq->wqe_ctr += nreq;
  486 
  487                 /* Make sure that descriptors are written before
  488                  * doorbell record.
  489                  */
  490                 wmb();
  491 
  492                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
  493         }
  494 out:
  495         spin_unlock_irqrestore(&srq->lock, flags);
  496 
  497         return err;
  498 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx5/mlx5_ib/mlx5_ib_srq.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx5/mlx5_ib/mlx5_ib_srq.c
