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-rw-r--r--drivers/infiniband/hw/mlx4/srq.c374
1 files changed, 374 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
new file mode 100644
index 000000000..c4cf91235
--- /dev/null
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -0,0 +1,374 @@
+/*
+ * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2007, 2008 Mellanox Technologies. 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 <linux/slab.h>
+
+#include "mlx4_ib.h"
+#include <rdma/mlx4-abi.h>
+#include <rdma/uverbs_ioctl.h>
+
+static void *get_wqe(struct mlx4_ib_srq *srq, int n)
+{
+ return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
+}
+
+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:
+ pr_warn("Unexpected event type %d "
+ "on SRQ %06x\n", type, srq->srqn);
+ return;
+ }
+
+ ibsrq->event_handler(&event, ibsrq->srq_context);
+ }
+}
+
+int mlx4_ib_create_srq(struct ib_srq *ib_srq,
+ struct ib_srq_init_attr *init_attr,
+ struct ib_udata *udata)
+{
+ struct mlx4_ib_dev *dev = to_mdev(ib_srq->device);
+ struct mlx4_ib_ucontext *ucontext = rdma_udata_to_drv_context(
+ udata, struct mlx4_ib_ucontext, ibucontext);
+ struct mlx4_ib_srq *srq = to_msrq(ib_srq);
+ struct mlx4_wqe_srq_next_seg *next;
+ struct mlx4_wqe_data_seg *scatter;
+ u32 cqn;
+ u16 xrcdn;
+ int desc_size;
+ int buf_size;
+ int err;
+ int i;
+
+ if (init_attr->srq_type != IB_SRQT_BASIC &&
+ init_attr->srq_type != IB_SRQT_XRC)
+ return -EOPNOTSUPP;
+
+ /* 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 -EINVAL;
+
+ 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 (udata) {
+ struct mlx4_ib_create_srq ucmd;
+
+ if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)))
+ return -EFAULT;
+
+ srq->umem =
+ ib_umem_get(ib_srq->device, ucmd.buf_addr, buf_size, 0);
+ if (IS_ERR(srq->umem))
+ return PTR_ERR(srq->umem);
+
+ err = mlx4_mtt_init(
+ dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE),
+ PAGE_SHIFT, &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(udata, ucmd.db_addr, &srq->db);
+ if (err)
+ goto err_mtt;
+ } else {
+ err = mlx4_db_alloc(dev->dev, &srq->db, 0);
+ if (err)
+ return err;
+
+ *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));
+
+ for (scatter = (void *) (next + 1);
+ (void *) scatter < (void *) next + desc_size;
+ ++scatter)
+ scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
+ }
+
+ 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 = kvmalloc_array(srq->msrq.max,
+ sizeof(u64), GFP_KERNEL);
+ if (!srq->wrid) {
+ err = -ENOMEM;
+ goto err_mtt;
+ }
+ }
+
+ cqn = ib_srq_has_cq(init_attr->srq_type) ?
+ to_mcq(init_attr->ext.cq)->mcq.cqn : 0;
+ xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
+ to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
+ (u16) dev->dev->caps.reserved_xrcds;
+ err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn,
+ &srq->mtt, srq->db.dma, &srq->msrq);
+ if (err)
+ goto err_wrid;
+
+ srq->msrq.event = mlx4_ib_srq_event;
+ srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
+
+ if (udata)
+ 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 0;
+
+err_wrid:
+ if (udata)
+ mlx4_ib_db_unmap_user(ucontext, &srq->db);
+ else
+ kvfree(srq->wrid);
+
+err_mtt:
+ mlx4_mtt_cleanup(dev->dev, &srq->mtt);
+
+err_buf:
+ if (!srq->umem)
+ mlx4_buf_free(dev->dev, buf_size, &srq->buf);
+ ib_umem_release(srq->umem);
+
+err_db:
+ if (!udata)
+ mlx4_db_free(dev->dev, &srq->db);
+
+ return 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 ib_udata *udata)
+{
+ 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 (udata) {
+ mlx4_ib_db_unmap_user(
+ rdma_udata_to_drv_context(
+ udata,
+ struct mlx4_ib_ucontext,
+ ibucontext),
+ &msrq->db);
+ } else {
+ kvfree(msrq->wrid);
+ mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
+ &msrq->buf);
+ mlx4_db_free(dev->dev, &msrq->db);
+ }
+ ib_umem_release(msrq->umem);
+ 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, const struct ib_recv_wr *wr,
+ const 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;
+ struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
+
+ spin_lock_irqsave(&srq->lock, flags);
+ if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
+ err = -EIO;
+ *bad_wr = wr;
+ goto out;
+ }
+
+ 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);
+ }
+out:
+
+ spin_unlock_irqrestore(&srq->lock, flags);
+
+ return err;
+}
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