diff options
Diffstat (limited to 'net/rds/ib_fmr.c')
| -rw-r--r-- | net/rds/ib_fmr.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/net/rds/ib_fmr.c b/net/rds/ib_fmr.c new file mode 100644 index 000000000000..4fe8f4fec4ee --- /dev/null +++ b/net/rds/ib_fmr.c @@ -0,0 +1,248 @@ +/* + * Copyright (c) 2016 Oracle. 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 "ib_mr.h" + +struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, int npages) +{ + struct rds_ib_mr_pool *pool; + struct rds_ib_mr *ibmr = NULL; + struct rds_ib_fmr *fmr; + int err = 0; + + if (npages <= RDS_MR_8K_MSG_SIZE) + pool = rds_ibdev->mr_8k_pool; + else + pool = rds_ibdev->mr_1m_pool; + + ibmr = rds_ib_try_reuse_ibmr(pool); + if (ibmr) + return ibmr; + + ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, + rdsibdev_to_node(rds_ibdev)); + if (!ibmr) { + err = -ENOMEM; + goto out_no_cigar; + } + + fmr = &ibmr->u.fmr; + fmr->fmr = ib_alloc_fmr(rds_ibdev->pd, + (IB_ACCESS_LOCAL_WRITE | + IB_ACCESS_REMOTE_READ | + IB_ACCESS_REMOTE_WRITE | + IB_ACCESS_REMOTE_ATOMIC), + &pool->fmr_attr); + if (IS_ERR(fmr->fmr)) { + err = PTR_ERR(fmr->fmr); + fmr->fmr = NULL; + pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, err); + goto out_no_cigar; + } + + ibmr->pool = pool; + if (pool->pool_type == RDS_IB_MR_8K_POOL) + rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc); + else + rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc); + + return ibmr; + +out_no_cigar: + if (ibmr) { + if (fmr->fmr) + ib_dealloc_fmr(fmr->fmr); + kfree(ibmr); + } + atomic_dec(&pool->item_count); + return ERR_PTR(err); +} + +int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr, + struct scatterlist *sg, unsigned int nents) +{ + struct ib_device *dev = rds_ibdev->dev; + struct rds_ib_fmr *fmr = &ibmr->u.fmr; + struct scatterlist *scat = sg; + u64 io_addr = 0; + u64 *dma_pages; + u32 len; + int page_cnt, sg_dma_len; + int i, j; + int ret; + + sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL); + if (unlikely(!sg_dma_len)) { + pr_warn("RDS/IB: %s failed!\n", __func__); + return -EBUSY; + } + + len = 0; + page_cnt = 0; + + for (i = 0; i < sg_dma_len; ++i) { + unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); + u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); + + if (dma_addr & ~PAGE_MASK) { + if (i > 0) + return -EINVAL; + else + ++page_cnt; + } + if ((dma_addr + dma_len) & ~PAGE_MASK) { + if (i < sg_dma_len - 1) + return -EINVAL; + else + ++page_cnt; + } + + len += dma_len; + } + + page_cnt += len >> PAGE_SHIFT; + if (page_cnt > ibmr->pool->fmr_attr.max_pages) + return -EINVAL; + + dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC, + rdsibdev_to_node(rds_ibdev)); + if (!dma_pages) + return -ENOMEM; + + page_cnt = 0; + for (i = 0; i < sg_dma_len; ++i) { + unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]); + u64 dma_addr = ib_sg_dma_address(dev, &scat[i]); + + for (j = 0; j < dma_len; j += PAGE_SIZE) + dma_pages[page_cnt++] = + (dma_addr & PAGE_MASK) + j; + } + + ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr); + if (ret) + goto out; + + /* Success - we successfully remapped the MR, so we can + * safely tear down the old mapping. + */ + rds_ib_teardown_mr(ibmr); + + ibmr->sg = scat; + ibmr->sg_len = nents; + ibmr->sg_dma_len = sg_dma_len; + ibmr->remap_count++; + + if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) + rds_ib_stats_inc(s_ib_rdma_mr_8k_used); + else + rds_ib_stats_inc(s_ib_rdma_mr_1m_used); + ret = 0; + +out: + kfree(dma_pages); + + return ret; +} + +struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *rds_ibdev, + struct scatterlist *sg, + unsigned long nents, + u32 *key) +{ + struct rds_ib_mr *ibmr = NULL; + struct rds_ib_fmr *fmr; + int ret; + + ibmr = rds_ib_alloc_fmr(rds_ibdev, nents); + if (IS_ERR(ibmr)) + return ibmr; + + ibmr->device = rds_ibdev; + fmr = &ibmr->u.fmr; + ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents); + if (ret == 0) + *key = fmr->fmr->rkey; + else + rds_ib_free_mr(ibmr, 0); + + return ibmr; +} + +void rds_ib_unreg_fmr(struct list_head *list, unsigned int *nfreed, + unsigned long *unpinned, unsigned int goal) +{ + struct rds_ib_mr *ibmr, *next; + struct rds_ib_fmr *fmr; + LIST_HEAD(fmr_list); + int ret = 0; + unsigned int freed = *nfreed; + + /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */ + list_for_each_entry(ibmr, list, unmap_list) { + fmr = &ibmr->u.fmr; + list_add(&fmr->fmr->list, &fmr_list); + } + + ret = ib_unmap_fmr(&fmr_list); + if (ret) + pr_warn("RDS/IB: FMR invalidation failed (err=%d)\n", ret); + + /* Now we can destroy the DMA mapping and unpin any pages */ + list_for_each_entry_safe(ibmr, next, list, unmap_list) { + fmr = &ibmr->u.fmr; + *unpinned += ibmr->sg_len; + __rds_ib_teardown_mr(ibmr); + if (freed < goal || + ibmr->remap_count >= ibmr->pool->fmr_attr.max_maps) { + if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL) + rds_ib_stats_inc(s_ib_rdma_mr_8k_free); + else + rds_ib_stats_inc(s_ib_rdma_mr_1m_free); + list_del(&ibmr->unmap_list); + ib_dealloc_fmr(fmr->fmr); + kfree(ibmr); + freed++; + } + } + *nfreed = freed; +} + +void rds_ib_free_fmr_list(struct rds_ib_mr *ibmr) +{ + struct rds_ib_mr_pool *pool = ibmr->pool; + + if (ibmr->remap_count >= pool->fmr_attr.max_maps) + llist_add(&ibmr->llnode, &pool->drop_list); + else + llist_add(&ibmr->llnode, &pool->free_list); +} |