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srq.c

/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/mlx4/qp.h>
#include <linux/mlx4/srq.h>

#include "mlx4_ib.h"
#include "user.h"

static void *get_wqe(struct mlx4_ib_srq *srq, int n)
{
      int offset = n << srq->msrq.wqe_shift;

      if (srq->buf.nbufs == 1)
            return srq->buf.u.direct.buf + offset;
      else
            return srq->buf.u.page_list[offset >> PAGE_SHIFT].buf +
                  (offset & (PAGE_SIZE - 1));
}

static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
{
      struct ib_event event;
      struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;

      if (ibsrq->event_handler) {
            event.device      = ibsrq->device;
            event.element.srq = ibsrq;
            switch (type) {
            case MLX4_EVENT_TYPE_SRQ_LIMIT:
                  event.event = IB_EVENT_SRQ_LIMIT_REACHED;
                  break;
            case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
                  event.event = IB_EVENT_SRQ_ERR;
                  break;
            default:
                  printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
                         "on SRQ %06x\n", type, srq->srqn);
                  return;
            }

            ibsrq->event_handler(&event, ibsrq->srq_context);
      }
}

struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
                          struct ib_srq_init_attr *init_attr,
                          struct ib_udata *udata)
{
      struct mlx4_ib_dev *dev = to_mdev(pd->device);
      struct mlx4_ib_srq *srq;
      struct mlx4_wqe_srq_next_seg *next;
      int desc_size;
      int buf_size;
      int err;
      int i;

      /* Sanity check SRQ size before proceeding */
      if (init_attr->attr.max_wr  >= dev->dev->caps.max_srq_wqes ||
          init_attr->attr.max_sge >  dev->dev->caps.max_srq_sge)
            return ERR_PTR(-EINVAL);

      srq = kmalloc(sizeof *srq, GFP_KERNEL);
      if (!srq)
            return ERR_PTR(-ENOMEM);

      mutex_init(&srq->mutex);
      spin_lock_init(&srq->lock);
      srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
      srq->msrq.max_gs = init_attr->attr.max_sge;

      desc_size = max(32UL,
                  roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
                                 srq->msrq.max_gs *
                                 sizeof (struct mlx4_wqe_data_seg)));
      srq->msrq.wqe_shift = ilog2(desc_size);

      buf_size = srq->msrq.max * desc_size;

      if (pd->uobject) {
            struct mlx4_ib_create_srq ucmd;

            if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
                  err = -EFAULT;
                  goto err_srq;
            }

            srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
                              buf_size, 0);
            if (IS_ERR(srq->umem)) {
                  err = PTR_ERR(srq->umem);
                  goto err_srq;
            }

            err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
                            ilog2(srq->umem->page_size), &srq->mtt);
            if (err)
                  goto err_buf;

            err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
            if (err)
                  goto err_mtt;

            err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
                                ucmd.db_addr, &srq->db);
            if (err)
                  goto err_mtt;
      } else {
            err = mlx4_ib_db_alloc(dev, &srq->db, 0);
            if (err)
                  goto err_srq;

            *srq->db.db = 0;

            if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
                  err = -ENOMEM;
                  goto err_db;
            }

            srq->head    = 0;
            srq->tail    = srq->msrq.max - 1;
            srq->wqe_ctr = 0;

            for (i = 0; i < srq->msrq.max; ++i) {
                  next = get_wqe(srq, i);
                  next->next_wqe_index =
                        cpu_to_be16((i + 1) & (srq->msrq.max - 1));
            }

            err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
                            &srq->mtt);
            if (err)
                  goto err_buf;

            err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
            if (err)
                  goto err_mtt;

            srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
            if (!srq->wrid) {
                  err = -ENOMEM;
                  goto err_mtt;
            }
      }

      err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
                       srq->db.dma, &srq->msrq);
      if (err)
            goto err_wrid;

      srq->msrq.event = mlx4_ib_srq_event;

      if (pd->uobject)
            if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
                  err = -EFAULT;
                  goto err_wrid;
            }

      init_attr->attr.max_wr = srq->msrq.max - 1;

      return &srq->ibsrq;

err_wrid:
      if (pd->uobject)
            mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
      else
            kfree(srq->wrid);

err_mtt:
      mlx4_mtt_cleanup(dev->dev, &srq->mtt);

err_buf:
      if (pd->uobject)
            ib_umem_release(srq->umem);
      else
            mlx4_buf_free(dev->dev, buf_size, &srq->buf);

err_db:
      if (!pd->uobject)
            mlx4_ib_db_free(dev, &srq->db);

err_srq:
      kfree(srq);

      return ERR_PTR(err);
}

int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
                   enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
{
      struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
      struct mlx4_ib_srq *srq = to_msrq(ibsrq);
      int ret;

      /* We don't support resizing SRQs (yet?) */
      if (attr_mask & IB_SRQ_MAX_WR)
            return -EINVAL;

      if (attr_mask & IB_SRQ_LIMIT) {
            if (attr->srq_limit >= srq->msrq.max)
                  return -EINVAL;

            mutex_lock(&srq->mutex);
            ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
            mutex_unlock(&srq->mutex);

            if (ret)
                  return ret;
      }

      return 0;
}

int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
{
      struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
      struct mlx4_ib_srq *srq = to_msrq(ibsrq);
      int ret;
      int limit_watermark;

      ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
      if (ret)
            return ret;

      srq_attr->srq_limit = limit_watermark;
      srq_attr->max_wr    = srq->msrq.max - 1;
      srq_attr->max_sge   = srq->msrq.max_gs;

      return 0;
}

int mlx4_ib_destroy_srq(struct ib_srq *srq)
{
      struct mlx4_ib_dev *dev = to_mdev(srq->device);
      struct mlx4_ib_srq *msrq = to_msrq(srq);

      mlx4_srq_free(dev->dev, &msrq->msrq);
      mlx4_mtt_cleanup(dev->dev, &msrq->mtt);

      if (srq->uobject) {
            mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
            ib_umem_release(msrq->umem);
      } else {
            kfree(msrq->wrid);
            mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
                        &msrq->buf);
            mlx4_ib_db_free(dev, &msrq->db);
      }

      kfree(msrq);

      return 0;
}

void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
{
      struct mlx4_wqe_srq_next_seg *next;

      /* always called with interrupts disabled. */
      spin_lock(&srq->lock);

      next = get_wqe(srq, srq->tail);
      next->next_wqe_index = cpu_to_be16(wqe_index);
      srq->tail = wqe_index;

      spin_unlock(&srq->lock);
}

int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
                    struct ib_recv_wr **bad_wr)
{
      struct mlx4_ib_srq *srq = to_msrq(ibsrq);
      struct mlx4_wqe_srq_next_seg *next;
      struct mlx4_wqe_data_seg *scat;
      unsigned long flags;
      int err = 0;
      int nreq;
      int i;

      spin_lock_irqsave(&srq->lock, flags);

      for (nreq = 0; wr; ++nreq, wr = wr->next) {
            if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
                  err = -EINVAL;
                  *bad_wr = wr;
                  break;
            }

            if (unlikely(srq->head == srq->tail)) {
                  err = -ENOMEM;
                  *bad_wr = wr;
                  break;
            }

            srq->wrid[srq->head] = wr->wr_id;

            next      = get_wqe(srq, srq->head);
            srq->head = be16_to_cpu(next->next_wqe_index);
            scat      = (struct mlx4_wqe_data_seg *) (next + 1);

            for (i = 0; i < wr->num_sge; ++i) {
                  scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
                  scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
                  scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
            }

            if (i < srq->msrq.max_gs) {
                  scat[i].byte_count = 0;
                  scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
                  scat[i].addr       = 0;
            }
      }

      if (likely(nreq)) {
            srq->wqe_ctr += nreq;

            /*
             * Make sure that descriptors are written before
             * doorbell record.
             */
            wmb();

            *srq->db.db = cpu_to_be32(srq->wqe_ctr);
      }

      spin_unlock_irqrestore(&srq->lock, flags);

      return err;
}

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