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RDS: IB: move FMR code to its own file
No functional change. 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>
This commit is contained in:
santosh.shilimkar@oracle.com
David S. Miller
parent
a69365a39c
commit
490ea5967b
126
net/rds/ib_fmr.c
126
net/rds/ib_fmr.c
@ -37,61 +37,16 @@ struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, int npages)
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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_fmr *fmr;
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int err = 0, iter = 0;
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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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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 = 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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@ -218,3 +173,76 @@ out:
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return ret;
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}
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struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *rds_ibdev,
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struct scatterlist *sg,
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unsigned long nents,
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u32 *key)
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{
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struct rds_ib_mr *ibmr = NULL;
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struct rds_ib_fmr *fmr;
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int ret;
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ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
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if (IS_ERR(ibmr))
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return ibmr;
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ibmr->device = rds_ibdev;
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fmr = &ibmr->u.fmr;
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ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
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if (ret == 0)
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*key = fmr->fmr->rkey;
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else
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rds_ib_free_mr(ibmr, 0);
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return ibmr;
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}
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void rds_ib_unreg_fmr(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_fmr *fmr;
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LIST_HEAD(fmr_list);
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int ret = 0;
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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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fmr = &ibmr->u.fmr;
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list_add(&fmr->fmr->list, &fmr_list);
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}
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ret = ib_unmap_fmr(&fmr_list);
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if (ret)
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pr_warn("RDS/IB: FMR invalidation failed (err=%d)\n", 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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fmr = &ibmr->u.fmr;
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*unpinned += ibmr->sg_len;
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__rds_ib_teardown_mr(ibmr);
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if (freed < goal ||
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ibmr->remap_count >= ibmr->pool->fmr_attr.max_maps) {
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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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ib_dealloc_fmr(fmr->fmr);
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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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void rds_ib_free_fmr_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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if (ibmr->remap_count >= pool->fmr_attr.max_maps)
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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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@ -113,4 +113,10 @@ int rds_ib_map_fmr(struct rds_ib_device *, struct rds_ib_mr *,
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struct scatterlist *, unsigned int);
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struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
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int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
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struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *,
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unsigned long, u32 *);
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struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
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void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
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unsigned long *, unsigned int);
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void rds_ib_free_fmr_list(struct rds_ib_mr *);
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#endif
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@ -333,15 +333,12 @@ static void list_to_llist_nodes(struct rds_ib_mr_pool *pool,
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int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
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int free_all, struct rds_ib_mr **ibmr_ret)
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{
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struct rds_ib_mr *ibmr, *next;
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struct rds_ib_fmr *fmr;
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struct rds_ib_mr *ibmr;
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struct llist_node *clean_nodes;
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struct llist_node *clean_tail;
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LIST_HEAD(unmap_list);
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LIST_HEAD(fmr_list);
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unsigned long unpinned = 0;
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unsigned int nfreed = 0, dirty_to_clean = 0, free_goal;
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int ret = 0;
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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_flush);
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@ -395,33 +392,7 @@ int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
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if (list_empty(&unmap_list))
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goto out;
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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, &unmap_list, unmap_list) {
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fmr = &ibmr->u.fmr;
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list_add(&fmr->fmr->list, &fmr_list);
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}
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ret = ib_unmap_fmr(&fmr_list);
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if (ret)
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printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", 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, &unmap_list, unmap_list) {
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unpinned += ibmr->sg_len;
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fmr = &ibmr->u.fmr;
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__rds_ib_teardown_mr(ibmr);
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if (nfreed < free_goal ||
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ibmr->remap_count >= pool->fmr_attr.max_maps) {
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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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ib_dealloc_fmr(fmr->fmr);
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kfree(ibmr);
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nfreed++;
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}
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}
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rds_ib_unreg_fmr(&unmap_list, &nfreed, &unpinned, free_goal);
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if (!list_empty(&unmap_list)) {
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/* we have to make sure that none of the things we're about
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@ -454,7 +425,47 @@ out:
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if (waitqueue_active(&pool->flush_wait))
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wake_up(&pool->flush_wait);
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out_nolock:
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return ret;
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return 0;
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}
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struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *pool)
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{
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struct rds_ib_mr *ibmr = NULL;
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int iter = 0;
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if (atomic_read(&pool->dirty_count) >= pool->max_items_soft / 10)
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queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10);
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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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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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return ibmr;
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}
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static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
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@ -473,10 +484,7 @@ void rds_ib_free_mr(void *trans_private, int invalidate)
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rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len);
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/* Return it to the pool's free list */
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if (ibmr->remap_count >= pool->fmr_attr.max_maps)
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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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rds_ib_free_fmr_list(ibmr);
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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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@ -521,7 +529,6 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
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{
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struct rds_ib_device *rds_ibdev;
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struct rds_ib_mr *ibmr = NULL;
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struct rds_ib_fmr *fmr;
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int ret;
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rds_ibdev = rds_ib_get_device(rs->rs_bound_addr);
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@ -535,30 +542,17 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
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goto out;
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}
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ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
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if (IS_ERR(ibmr)) {
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rds_ib_dev_put(rds_ibdev);
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return ibmr;
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}
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fmr = &ibmr->u.fmr;
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ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
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if (ret == 0)
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*key_ret = fmr->fmr->rkey;
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else
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printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret);
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ibmr->device = rds_ibdev;
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rds_ibdev = NULL;
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ibmr = rds_ib_reg_fmr(rds_ibdev, sg, nents, key_ret);
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if (ibmr)
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rds_ibdev = NULL;
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out:
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if (ret) {
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if (ibmr)
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rds_ib_free_mr(ibmr, 0);
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ibmr = ERR_PTR(ret);
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}
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if (!ibmr)
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pr_warn("RDS/IB: rds_ib_get_mr failed (errno=%d)\n", ret);
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if (rds_ibdev)
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rds_ib_dev_put(rds_ibdev);
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return ibmr;
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}
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