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446 lines
12 KiB
446 lines
12 KiB
/* |
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* Copyright (c) 2016 Oracle. 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 "ib_mr.h" |
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static inline void |
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rds_transition_frwr_state(struct rds_ib_mr *ibmr, |
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enum rds_ib_fr_state old_state, |
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enum rds_ib_fr_state new_state) |
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{ |
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if (cmpxchg(&ibmr->u.frmr.fr_state, |
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old_state, new_state) == old_state && |
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old_state == FRMR_IS_INUSE) { |
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/* enforce order of ibmr->u.frmr.fr_state update |
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* before decrementing i_fastreg_inuse_count |
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*/ |
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smp_mb__before_atomic(); |
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atomic_dec(&ibmr->ic->i_fastreg_inuse_count); |
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if (waitqueue_active(&rds_ib_ring_empty_wait)) |
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wake_up(&rds_ib_ring_empty_wait); |
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} |
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} |
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static struct rds_ib_mr *rds_ib_alloc_frmr(struct rds_ib_device *rds_ibdev, |
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int npages) |
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{ |
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struct rds_ib_mr_pool *pool; |
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struct rds_ib_mr *ibmr = NULL; |
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struct rds_ib_frmr *frmr; |
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int err = 0; |
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if (npages <= RDS_MR_8K_MSG_SIZE) |
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pool = rds_ibdev->mr_8k_pool; |
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else |
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pool = rds_ibdev->mr_1m_pool; |
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ibmr = rds_ib_try_reuse_ibmr(pool); |
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if (ibmr) |
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return ibmr; |
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ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, |
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rdsibdev_to_node(rds_ibdev)); |
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if (!ibmr) { |
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err = -ENOMEM; |
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goto out_no_cigar; |
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} |
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frmr = &ibmr->u.frmr; |
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frmr->mr = ib_alloc_mr(rds_ibdev->pd, IB_MR_TYPE_MEM_REG, |
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pool->max_pages); |
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if (IS_ERR(frmr->mr)) { |
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pr_warn("RDS/IB: %s failed to allocate MR", __func__); |
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err = PTR_ERR(frmr->mr); |
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goto out_no_cigar; |
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} |
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ibmr->pool = pool; |
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if (pool->pool_type == RDS_IB_MR_8K_POOL) |
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rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); |
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else |
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rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); |
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if (atomic_read(&pool->item_count) > pool->max_items_soft) |
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pool->max_items_soft = pool->max_items; |
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frmr->fr_state = FRMR_IS_FREE; |
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init_waitqueue_head(&frmr->fr_inv_done); |
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init_waitqueue_head(&frmr->fr_reg_done); |
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return ibmr; |
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out_no_cigar: |
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kfree(ibmr); |
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atomic_dec(&pool->item_count); |
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return ERR_PTR(err); |
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} |
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static void rds_ib_free_frmr(struct rds_ib_mr *ibmr, bool drop) |
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{ |
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struct rds_ib_mr_pool *pool = ibmr->pool; |
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if (drop) |
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llist_add(&ibmr->llnode, &pool->drop_list); |
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else |
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llist_add(&ibmr->llnode, &pool->free_list); |
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atomic_add(ibmr->sg_len, &pool->free_pinned); |
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atomic_inc(&pool->dirty_count); |
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/* If we've pinned too many pages, request a flush */ |
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if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || |
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atomic_read(&pool->dirty_count) >= pool->max_items / 5) |
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queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10); |
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} |
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static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr) |
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{ |
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struct rds_ib_frmr *frmr = &ibmr->u.frmr; |
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struct ib_reg_wr reg_wr; |
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int ret, off = 0; |
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while (atomic_dec_return(&ibmr->ic->i_fastreg_wrs) <= 0) { |
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atomic_inc(&ibmr->ic->i_fastreg_wrs); |
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cpu_relax(); |
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} |
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ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_dma_len, |
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&off, PAGE_SIZE); |
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if (unlikely(ret != ibmr->sg_dma_len)) |
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return ret < 0 ? ret : -EINVAL; |
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if (cmpxchg(&frmr->fr_state, |
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FRMR_IS_FREE, FRMR_IS_INUSE) != FRMR_IS_FREE) |
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return -EBUSY; |
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atomic_inc(&ibmr->ic->i_fastreg_inuse_count); |
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/* Perform a WR for the fast_reg_mr. Each individual page |
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* in the sg list is added to the fast reg page list and placed |
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* inside the fast_reg_mr WR. The key used is a rolling 8bit |
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* counter, which should guarantee uniqueness. |
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*/ |
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ib_update_fast_reg_key(frmr->mr, ibmr->remap_count++); |
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frmr->fr_reg = true; |
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memset(®_wr, 0, sizeof(reg_wr)); |
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reg_wr.wr.wr_id = (unsigned long)(void *)ibmr; |
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reg_wr.wr.opcode = IB_WR_REG_MR; |
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reg_wr.wr.num_sge = 0; |
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reg_wr.mr = frmr->mr; |
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reg_wr.key = frmr->mr->rkey; |
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reg_wr.access = IB_ACCESS_LOCAL_WRITE | |
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IB_ACCESS_REMOTE_READ | |
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IB_ACCESS_REMOTE_WRITE; |
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reg_wr.wr.send_flags = IB_SEND_SIGNALED; |
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ret = ib_post_send(ibmr->ic->i_cm_id->qp, ®_wr.wr, NULL); |
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if (unlikely(ret)) { |
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/* Failure here can be because of -ENOMEM as well */ |
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rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_STALE); |
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atomic_inc(&ibmr->ic->i_fastreg_wrs); |
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if (printk_ratelimit()) |
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pr_warn("RDS/IB: %s returned error(%d)\n", |
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__func__, ret); |
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goto out; |
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} |
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/* Wait for the registration to complete in order to prevent an invalid |
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* access error resulting from a race between the memory region already |
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* being accessed while registration is still pending. |
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*/ |
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wait_event(frmr->fr_reg_done, !frmr->fr_reg); |
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out: |
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return ret; |
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} |
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static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev, |
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struct rds_ib_mr_pool *pool, |
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struct rds_ib_mr *ibmr, |
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struct scatterlist *sg, unsigned int sg_len) |
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{ |
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struct ib_device *dev = rds_ibdev->dev; |
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struct rds_ib_frmr *frmr = &ibmr->u.frmr; |
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int i; |
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u32 len; |
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int ret = 0; |
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/* We want to teardown old ibmr values here and fill it up with |
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* new sg values |
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*/ |
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rds_ib_teardown_mr(ibmr); |
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ibmr->sg = sg; |
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ibmr->sg_len = sg_len; |
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ibmr->sg_dma_len = 0; |
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frmr->sg_byte_len = 0; |
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WARN_ON(ibmr->sg_dma_len); |
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ibmr->sg_dma_len = ib_dma_map_sg(dev, ibmr->sg, ibmr->sg_len, |
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DMA_BIDIRECTIONAL); |
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if (unlikely(!ibmr->sg_dma_len)) { |
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pr_warn("RDS/IB: %s failed!\n", __func__); |
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return -EBUSY; |
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} |
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frmr->sg_byte_len = 0; |
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frmr->dma_npages = 0; |
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len = 0; |
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ret = -EINVAL; |
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for (i = 0; i < ibmr->sg_dma_len; ++i) { |
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unsigned int dma_len = sg_dma_len(&ibmr->sg[i]); |
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u64 dma_addr = sg_dma_address(&ibmr->sg[i]); |
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frmr->sg_byte_len += dma_len; |
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if (dma_addr & ~PAGE_MASK) { |
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if (i > 0) |
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goto out_unmap; |
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else |
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++frmr->dma_npages; |
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} |
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if ((dma_addr + dma_len) & ~PAGE_MASK) { |
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if (i < ibmr->sg_dma_len - 1) |
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goto out_unmap; |
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else |
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++frmr->dma_npages; |
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} |
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len += dma_len; |
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} |
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frmr->dma_npages += len >> PAGE_SHIFT; |
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if (frmr->dma_npages > ibmr->pool->max_pages) { |
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ret = -EMSGSIZE; |
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goto out_unmap; |
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} |
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ret = rds_ib_post_reg_frmr(ibmr); |
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if (ret) |
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goto out_unmap; |
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if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) |
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rds_ib_stats_inc(s_ib_rdma_mr_8k_used); |
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else |
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rds_ib_stats_inc(s_ib_rdma_mr_1m_used); |
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return ret; |
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out_unmap: |
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ib_dma_unmap_sg(rds_ibdev->dev, ibmr->sg, ibmr->sg_len, |
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DMA_BIDIRECTIONAL); |
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ibmr->sg_dma_len = 0; |
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return ret; |
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} |
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static int rds_ib_post_inv(struct rds_ib_mr *ibmr) |
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{ |
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struct ib_send_wr *s_wr; |
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struct rds_ib_frmr *frmr = &ibmr->u.frmr; |
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struct rdma_cm_id *i_cm_id = ibmr->ic->i_cm_id; |
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int ret = -EINVAL; |
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if (!i_cm_id || !i_cm_id->qp || !frmr->mr) |
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goto out; |
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if (frmr->fr_state != FRMR_IS_INUSE) |
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goto out; |
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while (atomic_dec_return(&ibmr->ic->i_fastreg_wrs) <= 0) { |
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atomic_inc(&ibmr->ic->i_fastreg_wrs); |
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cpu_relax(); |
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} |
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frmr->fr_inv = true; |
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s_wr = &frmr->fr_wr; |
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memset(s_wr, 0, sizeof(*s_wr)); |
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s_wr->wr_id = (unsigned long)(void *)ibmr; |
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s_wr->opcode = IB_WR_LOCAL_INV; |
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s_wr->ex.invalidate_rkey = frmr->mr->rkey; |
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s_wr->send_flags = IB_SEND_SIGNALED; |
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ret = ib_post_send(i_cm_id->qp, s_wr, NULL); |
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if (unlikely(ret)) { |
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rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_STALE); |
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frmr->fr_inv = false; |
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/* enforce order of frmr->fr_inv update |
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* before incrementing i_fastreg_wrs |
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*/ |
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smp_mb__before_atomic(); |
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atomic_inc(&ibmr->ic->i_fastreg_wrs); |
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pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret); |
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goto out; |
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} |
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/* Wait for the FRMR_IS_FREE (or FRMR_IS_STALE) transition in order to |
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* 1) avoid a silly bouncing between "clean_list" and "drop_list" |
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* triggered by function "rds_ib_reg_frmr" as it is releases frmr |
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* regions whose state is not "FRMR_IS_FREE" right away. |
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* 2) prevents an invalid access error in a race |
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* from a pending "IB_WR_LOCAL_INV" operation |
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* with a teardown ("dma_unmap_sg", "put_page") |
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* and de-registration ("ib_dereg_mr") of the corresponding |
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* memory region. |
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*/ |
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wait_event(frmr->fr_inv_done, frmr->fr_state != FRMR_IS_INUSE); |
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out: |
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return ret; |
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} |
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void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc) |
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{ |
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struct rds_ib_mr *ibmr = (void *)(unsigned long)wc->wr_id; |
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struct rds_ib_frmr *frmr = &ibmr->u.frmr; |
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if (wc->status != IB_WC_SUCCESS) { |
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rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_STALE); |
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if (rds_conn_up(ic->conn)) |
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rds_ib_conn_error(ic->conn, |
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"frmr completion <%pI4,%pI4> status %u(%s), vendor_err 0x%x, disconnecting and reconnecting\n", |
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&ic->conn->c_laddr, |
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&ic->conn->c_faddr, |
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wc->status, |
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ib_wc_status_msg(wc->status), |
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wc->vendor_err); |
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} |
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if (frmr->fr_inv) { |
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rds_transition_frwr_state(ibmr, FRMR_IS_INUSE, FRMR_IS_FREE); |
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frmr->fr_inv = false; |
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wake_up(&frmr->fr_inv_done); |
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} |
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if (frmr->fr_reg) { |
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frmr->fr_reg = false; |
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wake_up(&frmr->fr_reg_done); |
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} |
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/* enforce order of frmr->{fr_reg,fr_inv} update |
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* before incrementing i_fastreg_wrs |
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*/ |
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smp_mb__before_atomic(); |
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atomic_inc(&ic->i_fastreg_wrs); |
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} |
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void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed, |
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unsigned long *unpinned, unsigned int goal) |
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{ |
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struct rds_ib_mr *ibmr, *next; |
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struct rds_ib_frmr *frmr; |
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int ret = 0, ret2; |
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unsigned int freed = *nfreed; |
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/* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ |
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list_for_each_entry(ibmr, list, unmap_list) { |
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if (ibmr->sg_dma_len) { |
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ret2 = rds_ib_post_inv(ibmr); |
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if (ret2 && !ret) |
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ret = ret2; |
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} |
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} |
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if (ret) |
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pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, ret); |
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/* Now we can destroy the DMA mapping and unpin any pages */ |
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list_for_each_entry_safe(ibmr, next, list, unmap_list) { |
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*unpinned += ibmr->sg_len; |
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frmr = &ibmr->u.frmr; |
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__rds_ib_teardown_mr(ibmr); |
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if (freed < goal || frmr->fr_state == FRMR_IS_STALE) { |
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/* Don't de-allocate if the MR is not free yet */ |
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if (frmr->fr_state == FRMR_IS_INUSE) |
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continue; |
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if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) |
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rds_ib_stats_inc(s_ib_rdma_mr_8k_free); |
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else |
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rds_ib_stats_inc(s_ib_rdma_mr_1m_free); |
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list_del(&ibmr->unmap_list); |
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if (frmr->mr) |
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ib_dereg_mr(frmr->mr); |
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kfree(ibmr); |
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freed++; |
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} |
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} |
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*nfreed = freed; |
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} |
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struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev, |
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struct rds_ib_connection *ic, |
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struct scatterlist *sg, |
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unsigned long nents, u32 *key) |
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{ |
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struct rds_ib_mr *ibmr = NULL; |
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struct rds_ib_frmr *frmr; |
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int ret; |
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if (!ic) { |
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/* TODO: Add FRWR support for RDS_GET_MR using proxy qp*/ |
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return ERR_PTR(-EOPNOTSUPP); |
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} |
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do { |
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if (ibmr) |
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rds_ib_free_frmr(ibmr, true); |
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ibmr = rds_ib_alloc_frmr(rds_ibdev, nents); |
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if (IS_ERR(ibmr)) |
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return ibmr; |
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frmr = &ibmr->u.frmr; |
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} while (frmr->fr_state != FRMR_IS_FREE); |
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ibmr->ic = ic; |
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ibmr->device = rds_ibdev; |
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ret = rds_ib_map_frmr(rds_ibdev, ibmr->pool, ibmr, sg, nents); |
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if (ret == 0) { |
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*key = frmr->mr->rkey; |
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} else { |
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rds_ib_free_frmr(ibmr, false); |
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ibmr = ERR_PTR(ret); |
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} |
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return ibmr; |
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} |
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void rds_ib_free_frmr_list(struct rds_ib_mr *ibmr) |
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{ |
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struct rds_ib_mr_pool *pool = ibmr->pool; |
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struct rds_ib_frmr *frmr = &ibmr->u.frmr; |
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if (frmr->fr_state == FRMR_IS_STALE) |
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llist_add(&ibmr->llnode, &pool->drop_list); |
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else |
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llist_add(&ibmr->llnode, &pool->free_list); |
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}
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