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375 lines
9.3 KiB
375 lines
9.3 KiB
/* |
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* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. |
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* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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#include <linux/mlx4/qp.h> |
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#include <linux/mlx4/srq.h> |
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#include <linux/slab.h> |
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#include "mlx4_ib.h" |
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#include <rdma/mlx4-abi.h> |
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#include <rdma/uverbs_ioctl.h> |
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static void *get_wqe(struct mlx4_ib_srq *srq, int n) |
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{ |
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return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); |
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} |
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static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type) |
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{ |
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struct ib_event event; |
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struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; |
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|
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if (ibsrq->event_handler) { |
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event.device = ibsrq->device; |
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event.element.srq = ibsrq; |
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switch (type) { |
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case MLX4_EVENT_TYPE_SRQ_LIMIT: |
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event.event = IB_EVENT_SRQ_LIMIT_REACHED; |
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break; |
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case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR: |
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event.event = IB_EVENT_SRQ_ERR; |
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break; |
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default: |
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pr_warn("Unexpected event type %d " |
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"on SRQ %06x\n", type, srq->srqn); |
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return; |
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} |
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ibsrq->event_handler(&event, ibsrq->srq_context); |
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} |
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} |
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int mlx4_ib_create_srq(struct ib_srq *ib_srq, |
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struct ib_srq_init_attr *init_attr, |
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struct ib_udata *udata) |
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{ |
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struct mlx4_ib_dev *dev = to_mdev(ib_srq->device); |
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struct mlx4_ib_ucontext *ucontext = rdma_udata_to_drv_context( |
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udata, struct mlx4_ib_ucontext, ibucontext); |
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struct mlx4_ib_srq *srq = to_msrq(ib_srq); |
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struct mlx4_wqe_srq_next_seg *next; |
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struct mlx4_wqe_data_seg *scatter; |
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u32 cqn; |
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u16 xrcdn; |
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int desc_size; |
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int buf_size; |
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int err; |
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int i; |
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if (init_attr->srq_type != IB_SRQT_BASIC && |
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init_attr->srq_type != IB_SRQT_XRC) |
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return -EOPNOTSUPP; |
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/* Sanity check SRQ size before proceeding */ |
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if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || |
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init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) |
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return -EINVAL; |
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mutex_init(&srq->mutex); |
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spin_lock_init(&srq->lock); |
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srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); |
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srq->msrq.max_gs = init_attr->attr.max_sge; |
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desc_size = max(32UL, |
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roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + |
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srq->msrq.max_gs * |
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sizeof (struct mlx4_wqe_data_seg))); |
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srq->msrq.wqe_shift = ilog2(desc_size); |
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buf_size = srq->msrq.max * desc_size; |
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if (udata) { |
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struct mlx4_ib_create_srq ucmd; |
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if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) |
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return -EFAULT; |
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srq->umem = |
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ib_umem_get(ib_srq->device, ucmd.buf_addr, buf_size, 0); |
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if (IS_ERR(srq->umem)) |
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return PTR_ERR(srq->umem); |
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err = mlx4_mtt_init( |
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dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE), |
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PAGE_SHIFT, &srq->mtt); |
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if (err) |
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goto err_buf; |
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err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); |
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if (err) |
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goto err_mtt; |
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err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &srq->db); |
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if (err) |
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goto err_mtt; |
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} else { |
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err = mlx4_db_alloc(dev->dev, &srq->db, 0); |
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if (err) |
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return err; |
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*srq->db.db = 0; |
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if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, |
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&srq->buf)) { |
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err = -ENOMEM; |
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goto err_db; |
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} |
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srq->head = 0; |
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srq->tail = srq->msrq.max - 1; |
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srq->wqe_ctr = 0; |
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for (i = 0; i < srq->msrq.max; ++i) { |
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next = get_wqe(srq, i); |
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next->next_wqe_index = |
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cpu_to_be16((i + 1) & (srq->msrq.max - 1)); |
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for (scatter = (void *) (next + 1); |
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(void *) scatter < (void *) next + desc_size; |
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++scatter) |
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scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); |
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} |
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err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, |
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&srq->mtt); |
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if (err) |
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goto err_buf; |
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err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf); |
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if (err) |
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goto err_mtt; |
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srq->wrid = kvmalloc_array(srq->msrq.max, |
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sizeof(u64), GFP_KERNEL); |
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if (!srq->wrid) { |
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err = -ENOMEM; |
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goto err_mtt; |
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} |
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} |
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cqn = ib_srq_has_cq(init_attr->srq_type) ? |
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to_mcq(init_attr->ext.cq)->mcq.cqn : 0; |
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xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? |
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to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : |
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(u16) dev->dev->caps.reserved_xrcds; |
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err = mlx4_srq_alloc(dev->dev, to_mpd(ib_srq->pd)->pdn, cqn, xrcdn, |
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&srq->mtt, srq->db.dma, &srq->msrq); |
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if (err) |
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goto err_wrid; |
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srq->msrq.event = mlx4_ib_srq_event; |
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srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; |
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if (udata) |
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if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { |
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err = -EFAULT; |
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goto err_wrid; |
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} |
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init_attr->attr.max_wr = srq->msrq.max - 1; |
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return 0; |
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err_wrid: |
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if (udata) |
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mlx4_ib_db_unmap_user(ucontext, &srq->db); |
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else |
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kvfree(srq->wrid); |
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err_mtt: |
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mlx4_mtt_cleanup(dev->dev, &srq->mtt); |
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err_buf: |
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if (!srq->umem) |
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mlx4_buf_free(dev->dev, buf_size, &srq->buf); |
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ib_umem_release(srq->umem); |
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err_db: |
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if (!udata) |
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mlx4_db_free(dev->dev, &srq->db); |
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return err; |
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} |
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int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, |
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enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) |
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{ |
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struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); |
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struct mlx4_ib_srq *srq = to_msrq(ibsrq); |
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int ret; |
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/* We don't support resizing SRQs (yet?) */ |
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if (attr_mask & IB_SRQ_MAX_WR) |
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return -EINVAL; |
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if (attr_mask & IB_SRQ_LIMIT) { |
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if (attr->srq_limit >= srq->msrq.max) |
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return -EINVAL; |
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mutex_lock(&srq->mutex); |
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ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); |
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mutex_unlock(&srq->mutex); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) |
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{ |
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struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); |
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struct mlx4_ib_srq *srq = to_msrq(ibsrq); |
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int ret; |
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int limit_watermark; |
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ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); |
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if (ret) |
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return ret; |
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srq_attr->srq_limit = limit_watermark; |
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srq_attr->max_wr = srq->msrq.max - 1; |
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srq_attr->max_sge = srq->msrq.max_gs; |
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return 0; |
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} |
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int mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata) |
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{ |
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struct mlx4_ib_dev *dev = to_mdev(srq->device); |
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struct mlx4_ib_srq *msrq = to_msrq(srq); |
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mlx4_srq_free(dev->dev, &msrq->msrq); |
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mlx4_mtt_cleanup(dev->dev, &msrq->mtt); |
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if (udata) { |
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mlx4_ib_db_unmap_user( |
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rdma_udata_to_drv_context( |
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udata, |
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struct mlx4_ib_ucontext, |
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ibucontext), |
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&msrq->db); |
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} else { |
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kvfree(msrq->wrid); |
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mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, |
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&msrq->buf); |
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mlx4_db_free(dev->dev, &msrq->db); |
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} |
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ib_umem_release(msrq->umem); |
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return 0; |
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} |
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void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) |
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{ |
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struct mlx4_wqe_srq_next_seg *next; |
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/* always called with interrupts disabled. */ |
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spin_lock(&srq->lock); |
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next = get_wqe(srq, srq->tail); |
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next->next_wqe_index = cpu_to_be16(wqe_index); |
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srq->tail = wqe_index; |
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spin_unlock(&srq->lock); |
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} |
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int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, |
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const struct ib_recv_wr **bad_wr) |
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{ |
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struct mlx4_ib_srq *srq = to_msrq(ibsrq); |
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struct mlx4_wqe_srq_next_seg *next; |
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struct mlx4_wqe_data_seg *scat; |
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unsigned long flags; |
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int err = 0; |
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int nreq; |
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int i; |
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struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device); |
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spin_lock_irqsave(&srq->lock, flags); |
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if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) { |
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err = -EIO; |
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*bad_wr = wr; |
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nreq = 0; |
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goto out; |
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} |
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for (nreq = 0; wr; ++nreq, wr = wr->next) { |
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if (unlikely(wr->num_sge > srq->msrq.max_gs)) { |
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err = -EINVAL; |
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*bad_wr = wr; |
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break; |
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} |
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if (unlikely(srq->head == srq->tail)) { |
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err = -ENOMEM; |
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*bad_wr = wr; |
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break; |
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} |
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srq->wrid[srq->head] = wr->wr_id; |
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next = get_wqe(srq, srq->head); |
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srq->head = be16_to_cpu(next->next_wqe_index); |
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scat = (struct mlx4_wqe_data_seg *) (next + 1); |
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for (i = 0; i < wr->num_sge; ++i) { |
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scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); |
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scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); |
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scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); |
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} |
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if (i < srq->msrq.max_gs) { |
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scat[i].byte_count = 0; |
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scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); |
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scat[i].addr = 0; |
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} |
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} |
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if (likely(nreq)) { |
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srq->wqe_ctr += nreq; |
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|
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/* |
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* Make sure that descriptors are written before |
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* doorbell record. |
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*/ |
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wmb(); |
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*srq->db.db = cpu_to_be32(srq->wqe_ctr); |
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} |
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out: |
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spin_unlock_irqrestore(&srq->lock, flags); |
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return err; |
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}
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