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![santosh.shilimkar@oracle.com](/assets/img/avatar_default.png)
No functional changes. This is in preperation towards adding fastreg memory resgitration support. Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
217 lines
5.7 KiB
C
217 lines
5.7 KiB
C
/*
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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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struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, 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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int err = 0, iter = 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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if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
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queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10);
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/* Switch pools if one of the pool is reaching upper limit */
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if (atomic_read(&pool->dirty_count) >= pool->max_items * 9 / 10) {
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if (pool->pool_type == RDS_IB_MR_8K_POOL)
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pool = rds_ibdev->mr_1m_pool;
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else
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pool = rds_ibdev->mr_8k_pool;
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}
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while (1) {
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ibmr = rds_ib_reuse_mr(pool);
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if (ibmr)
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return ibmr;
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/* No clean MRs - now we have the choice of either
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* allocating a fresh MR up to the limit imposed by the
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* driver, or flush any dirty unused MRs.
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* We try to avoid stalling in the send path if possible,
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* so we allocate as long as we're allowed to.
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*
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* We're fussy with enforcing the FMR limit, though. If the
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* driver tells us we can't use more than N fmrs, we shouldn't
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* start arguing with it
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*/
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if (atomic_inc_return(&pool->item_count) <= pool->max_items)
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break;
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atomic_dec(&pool->item_count);
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if (++iter > 2) {
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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_pool_depleted);
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else
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rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_depleted);
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return ERR_PTR(-EAGAIN);
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}
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/* We do have some empty MRs. Flush them out. */
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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_pool_wait);
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else
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rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_wait);
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rds_ib_flush_mr_pool(pool, 0, &ibmr);
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if (ibmr)
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return ibmr;
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}
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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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ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
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(IB_ACCESS_LOCAL_WRITE |
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IB_ACCESS_REMOTE_READ |
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IB_ACCESS_REMOTE_WRITE |
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IB_ACCESS_REMOTE_ATOMIC),
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&pool->fmr_attr);
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if (IS_ERR(ibmr->fmr)) {
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err = PTR_ERR(ibmr->fmr);
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ibmr->fmr = NULL;
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pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, err);
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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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return ibmr;
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out_no_cigar:
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if (ibmr) {
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if (ibmr->fmr)
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ib_dealloc_fmr(ibmr->fmr);
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kfree(ibmr);
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}
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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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int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr,
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struct scatterlist *sg, unsigned int nents)
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{
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struct ib_device *dev = rds_ibdev->dev;
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struct scatterlist *scat = sg;
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u64 io_addr = 0;
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u64 *dma_pages;
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u32 len;
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int page_cnt, sg_dma_len;
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int i, j;
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int ret;
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sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
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if (unlikely(!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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len = 0;
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page_cnt = 0;
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for (i = 0; i < sg_dma_len; ++i) {
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unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
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u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
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if (dma_addr & ~PAGE_MASK) {
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if (i > 0)
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return -EINVAL;
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else
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++page_cnt;
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}
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if ((dma_addr + dma_len) & ~PAGE_MASK) {
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if (i < sg_dma_len - 1)
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return -EINVAL;
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else
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++page_cnt;
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}
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len += dma_len;
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}
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page_cnt += len >> PAGE_SHIFT;
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if (page_cnt > ibmr->pool->fmr_attr.max_pages)
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return -EINVAL;
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dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC,
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rdsibdev_to_node(rds_ibdev));
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if (!dma_pages)
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return -ENOMEM;
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page_cnt = 0;
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for (i = 0; i < sg_dma_len; ++i) {
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unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
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u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
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for (j = 0; j < dma_len; j += PAGE_SIZE)
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dma_pages[page_cnt++] =
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(dma_addr & PAGE_MASK) + j;
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}
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ret = ib_map_phys_fmr(ibmr->fmr, dma_pages, page_cnt, io_addr);
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if (ret)
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goto out;
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/* Success - we successfully remapped the MR, so we can
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* safely tear down the old mapping.
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*/
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rds_ib_teardown_mr(ibmr);
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ibmr->sg = scat;
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ibmr->sg_len = nents;
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ibmr->sg_dma_len = sg_dma_len;
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ibmr->remap_count++;
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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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ret = 0;
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out:
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kfree(dma_pages);
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return ret;
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}
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