RDS: IB: Re-organise ibmr code
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>
diff --git a/net/rds/ib_fmr.c b/net/rds/ib_fmr.c
new file mode 100644
index 0000000..d4f200d
--- /dev/null
+++ b/net/rds/ib_fmr.c
@@ -0,0 +1,217 @@
+/*
+ * 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;
+ int err = 0, iter = 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;
+ }
+
+ while (1) {
+ ibmr = rds_ib_reuse_mr(pool);
+ if (ibmr)
+ return ibmr;
+
+ /* No clean MRs - now we have the choice of either
+ * allocating a fresh MR up to the limit imposed by the
+ * driver, or flush any dirty unused MRs.
+ * We try to avoid stalling in the send path if possible,
+ * so we allocate as long as we're allowed to.
+ *
+ * We're fussy with enforcing the FMR limit, though. If the
+ * driver tells us we can't use more than N fmrs, we shouldn't
+ * start arguing with it
+ */
+ if (atomic_inc_return(&pool->item_count) <= pool->max_items)
+ break;
+
+ atomic_dec(&pool->item_count);
+
+ if (++iter > 2) {
+ if (pool->pool_type == RDS_IB_MR_8K_POOL)
+ rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_depleted);
+ else
+ rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_depleted);
+ return ERR_PTR(-EAGAIN);
+ }
+
+ /* We do have some empty MRs. Flush them out. */
+ if (pool->pool_type == RDS_IB_MR_8K_POOL)
+ rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_wait);
+ else
+ rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_wait);
+ rds_ib_flush_mr_pool(pool, 0, &ibmr);
+ if (ibmr)
+ return ibmr;
+ }
+
+ ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL,
+ rdsibdev_to_node(rds_ibdev));
+ if (!ibmr) {
+ err = -ENOMEM;
+ goto out_no_cigar;
+ }
+
+ ibmr->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(ibmr->fmr)) {
+ err = PTR_ERR(ibmr->fmr);
+ ibmr->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 (ibmr->fmr)
+ ib_dealloc_fmr(ibmr->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 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(ibmr->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;
+}