6.8-stable review patch. If anyone has any objections, please let me know.
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From: Or Har-Toov ohartoov@nvidia.com
[ Upstream commit 8c1185fef68cc603b954fece2a434c9f851d6a86 ]
umem can be NULL for user application mkeys in some cases. Therefore umem can't be used for checking if the mkey is cacheable and it is changed for checking a flag that indicates it. Also make sure that all mkeys which are not returned to the cache will be destroyed.
Fixes: dd1b913fb0d0 ("RDMA/mlx5: Cache all user cacheable mkeys on dereg MR flow") Signed-off-by: Or Har-Toov ohartoov@nvidia.com Link: https://lore.kernel.org/r/2690bc5c6896bcb937f89af16a1ff0343a7ab3d0.171214037... Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 + drivers/infiniband/hw/mlx5/mr.c | 32 +++++++++++++++++++--------- 2 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index 989968ba74153..79ebafecca22a 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -646,6 +646,7 @@ struct mlx5_ib_mkey { /* Cacheable user Mkey must hold either a rb_key or a cache_ent. */ struct mlx5r_cache_rb_key rb_key; struct mlx5_cache_ent *cache_ent; + u8 cacheable : 1; };
#define MLX5_IB_MTT_PRESENT (MLX5_IB_MTT_READ | MLX5_IB_MTT_WRITE) diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index a8ee2ca1f4a17..7f7b1f59b5f05 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1158,6 +1158,7 @@ static struct mlx5_ib_mr *alloc_cacheable_mr(struct ib_pd *pd, if (IS_ERR(mr)) return mr; mr->mmkey.rb_key = rb_key; + mr->mmkey.cacheable = true; return mr; }
@@ -1168,6 +1169,7 @@ static struct mlx5_ib_mr *alloc_cacheable_mr(struct ib_pd *pd, mr->ibmr.pd = pd; mr->umem = umem; mr->page_shift = order_base_2(page_size); + mr->mmkey.cacheable = true; set_mr_fields(dev, mr, umem->length, access_flags, iova);
return mr; @@ -1835,6 +1837,23 @@ static int cache_ent_find_and_store(struct mlx5_ib_dev *dev, return ret; }
+static int mlx5_revoke_mr(struct mlx5_ib_mr *mr) +{ + struct mlx5_ib_dev *dev = to_mdev(mr->ibmr.device); + struct mlx5_cache_ent *ent = mr->mmkey.cache_ent; + + if (mr->mmkey.cacheable && !mlx5r_umr_revoke_mr(mr) && !cache_ent_find_and_store(dev, mr)) + return 0; + + if (ent) { + spin_lock_irq(&ent->mkeys_queue.lock); + ent->in_use--; + mr->mmkey.cache_ent = NULL; + spin_unlock_irq(&ent->mkeys_queue.lock); + } + return destroy_mkey(dev, mr); +} + int mlx5_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) { struct mlx5_ib_mr *mr = to_mmr(ibmr); @@ -1880,16 +1899,9 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) }
/* Stop DMA */ - if (mr->umem && mlx5r_umr_can_load_pas(dev, mr->umem->length)) - if (mlx5r_umr_revoke_mr(mr) || - cache_ent_find_and_store(dev, mr)) - mr->mmkey.cache_ent = NULL; - - if (!mr->mmkey.cache_ent) { - rc = destroy_mkey(to_mdev(mr->ibmr.device), mr); - if (rc) - return rc; - } + rc = mlx5_revoke_mr(mr); + if (rc) + return rc;
if (mr->umem) { bool is_odp = is_odp_mr(mr);