RDMA/rds: Remove FMR support for memory registration

Use FRWR method for memory registration by default and remove the ancient
and unsafe FMR method.

Link: https://lore.kernel.org/r/3-v3-f58e6669d5d3+2cf-fmr_removal_jgg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 0 insertions, 269 deletions

diff --git a/net/rds/ib_fmr.c b/net/rds/ib_fmr.c
deleted file mode 100644
index 93c0437e6a5f..000000000000
--- a/net/rds/ib_fmr.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/*
- * 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;
-
-	if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
-		queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10);
-
-	/* Switch pools if one of the pool is reaching upper limit */
-	if (atomic_read(&pool->dirty_count) >=  pool->max_items * 9 / 10) {
-		if (pool->pool_type == RDS_IB_MR_8K_POOL)
-			pool = rds_ibdev->mr_1m_pool;
-		else
-			pool = rds_ibdev->mr_8k_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:
-	kfree(ibmr);
-	atomic_dec(&pool->item_count);
-
-	return ERR_PTR(err);
-}
-
-static 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 = sg_dma_len(&scat[i]);
-		u64 dma_addr = sg_dma_address(&scat[i]);
-
-		if (dma_addr & ~PAGE_MASK) {
-			if (i > 0) {
-				ib_dma_unmap_sg(dev, sg, nents,
-						DMA_BIDIRECTIONAL);
-				return -EINVAL;
-			} else {
-				++page_cnt;
-			}
-		}
-		if ((dma_addr + dma_len) & ~PAGE_MASK) {
-			if (i < sg_dma_len - 1) {
-				ib_dma_unmap_sg(dev, sg, nents,
-						DMA_BIDIRECTIONAL);
-				return -EINVAL;
-			} else {
-				++page_cnt;
-			}
-		}
-
-		len += dma_len;
-	}
-
-	page_cnt += len >> PAGE_SHIFT;
-	if (page_cnt > ibmr->pool->fmr_attr.max_pages) {
-		ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
-		return -EINVAL;
-	}
-
-	dma_pages = kmalloc_array_node(sizeof(u64), page_cnt, GFP_ATOMIC,
-				       rdsibdev_to_node(rds_ibdev));
-	if (!dma_pages) {
-		ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
-		return -ENOMEM;
-	}
-
-	page_cnt = 0;
-	for (i = 0; i < sg_dma_len; ++i) {
-		unsigned int dma_len = sg_dma_len(&scat[i]);
-		u64 dma_addr = sg_dma_address(&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) {
-		ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
-		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);
-}