RDS: IB: move FMR code to its own file

[cascardo/linux.git] / net / rds / ib_rdma.c

diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index 9e608d9..0e84843 100644 (file)
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -333,15 +333,12 @@ static void list_to_llist_nodes(struct rds_ib_mr_pool *pool,
 int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
                         int free_all, struct rds_ib_mr **ibmr_ret)
 {
-       struct rds_ib_mr *ibmr, *next;
-       struct rds_ib_fmr *fmr;
+       struct rds_ib_mr *ibmr;
        struct llist_node *clean_nodes;
        struct llist_node *clean_tail;
        LIST_HEAD(unmap_list);
-       LIST_HEAD(fmr_list);
        unsigned long unpinned = 0;
        unsigned int nfreed = 0, dirty_to_clean = 0, free_goal;
-       int ret = 0;
 
        if (pool->pool_type == RDS_IB_MR_8K_POOL)
                rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_flush);
@@ -395,33 +392,7 @@ int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
        if (list_empty(&unmap_list))
                goto out;
 
-       /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
-       list_for_each_entry(ibmr, &unmap_list, unmap_list) {
-               fmr = &ibmr->u.fmr;
-               list_add(&fmr->fmr->list, &fmr_list);
-       }
-
-       ret = ib_unmap_fmr(&fmr_list);
-       if (ret)
-               printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret);
-
-       /* Now we can destroy the DMA mapping and unpin any pages */
-       list_for_each_entry_safe(ibmr, next, &unmap_list, unmap_list) {
-               unpinned += ibmr->sg_len;
-               fmr = &ibmr->u.fmr;
-               __rds_ib_teardown_mr(ibmr);
-               if (nfreed < free_goal ||
-                   ibmr->remap_count >= 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);
-                       nfreed++;
-               }
-       }
+       rds_ib_unreg_fmr(&unmap_list, &nfreed, &unpinned, free_goal);
 
        if (!list_empty(&unmap_list)) {
                /* we have to make sure that none of the things we're about
@@ -454,7 +425,47 @@ out:
        if (waitqueue_active(&pool->flush_wait))
                wake_up(&pool->flush_wait);
 out_nolock:
-       return ret;
+       return 0;
+}
+
+struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *pool)
+{
+       struct rds_ib_mr *ibmr = NULL;
+       int iter = 0;
+
+       if (atomic_read(&pool->dirty_count) >= pool->max_items_soft / 10)
+               queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10);
+
+       while (1) {
+               ibmr = rds_ib_reuse_mr(pool);
+               if (ibmr)
+                       return ibmr;
+
+               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;
+       }
+
+       return ibmr;
 }
 
 static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
@@ -473,10 +484,7 @@ void rds_ib_free_mr(void *trans_private, int invalidate)
        rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len);
 
        /* Return it to the pool's free list */
-       if (ibmr->remap_count >= pool->fmr_attr.max_maps)
-               llist_add(&ibmr->llnode, &pool->drop_list);
-       else
-               llist_add(&ibmr->llnode, &pool->free_list);
+       rds_ib_free_fmr_list(ibmr);
 
        atomic_add(ibmr->sg_len, &pool->free_pinned);
        atomic_inc(&pool->dirty_count);
@@ -521,7 +529,6 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 {
        struct rds_ib_device *rds_ibdev;
        struct rds_ib_mr *ibmr = NULL;
-       struct rds_ib_fmr *fmr;
        int ret;
 
        rds_ibdev = rds_ib_get_device(rs->rs_bound_addr);
@@ -535,30 +542,17 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
                goto out;
        }
 
-       ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
-       if (IS_ERR(ibmr)) {
-               rds_ib_dev_put(rds_ibdev);
-               return ibmr;
-       }
-
-       fmr = &ibmr->u.fmr;
-       ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
-       if (ret == 0)
-               *key_ret = fmr->fmr->rkey;
-       else
-               printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret);
-
-       ibmr->device = rds_ibdev;
-       rds_ibdev = NULL;
+       ibmr = rds_ib_reg_fmr(rds_ibdev, sg, nents, key_ret);
+       if (ibmr)
+               rds_ibdev = NULL;
 
  out:
-       if (ret) {
-               if (ibmr)
-                       rds_ib_free_mr(ibmr, 0);
-               ibmr = ERR_PTR(ret);
-       }
+       if (!ibmr)
+               pr_warn("RDS/IB: rds_ib_get_mr failed (errno=%d)\n", ret);
+
        if (rds_ibdev)
                rds_ib_dev_put(rds_ibdev);
+
        return ibmr;
 }