diff options
| -rw-r--r-- | net/rds/ib_fmr.c | 126 | ||||
| -rw-r--r-- | net/rds/ib_mr.h | 6 | ||||
| -rw-r--r-- | net/rds/ib_rdma.c | 108 |
3 files changed, 134 insertions, 106 deletions
diff --git a/net/rds/ib_fmr.c b/net/rds/ib_fmr.c index 74f2c21ebc7a..4fe8f4fec4ee 100644 --- a/net/rds/ib_fmr.c +++ b/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) struct rds_ib_mr_pool *pool; struct rds_ib_mr *ibmr = NULL; struct rds_ib_fmr *fmr; - int err = 0, iter = 0; + 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; - } - - 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 = rds_ib_try_reuse_ibmr(pool); + if (ibmr) + return ibmr; ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev)); @@ -218,3 +173,76 @@ out: 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); +} diff --git a/net/rds/ib_mr.h b/net/rds/ib_mr.h index 309ad59bf218..f5c1fcb4b91e 100644 --- a/net/rds/ib_mr.h +++ b/net/rds/ib_mr.h @@ -113,4 +113,10 @@ int rds_ib_map_fmr(struct rds_ib_device *, struct rds_ib_mr *, struct scatterlist *, unsigned int); struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *); int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **); +struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *, + unsigned long, u32 *); +struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *); +void rds_ib_unreg_fmr(struct list_head *, unsigned int *, + unsigned long *, unsigned int); +void rds_ib_free_fmr_list(struct rds_ib_mr *); #endif diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index 9e608d99a570..0e848433597f 100644 --- 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; } |