From 8c1185fef68cc603b954fece2a434c9f851d6a86 Mon Sep 17 00:00:00 2001 From: Or Har-Toov Date: Wed, 3 Apr 2024 13:36:00 +0300 Subject: [PATCH] RDMA/mlx5: Change check for cacheable mkeys 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 Link: https://lore.kernel.org/r/2690bc5c6896bcb937f89af16a1ff0343a7ab3d0.1712140377.git.leon@kernel.org Signed-off-by: Leon Romanovsky --- 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 e74f04865062..f255a12e26a0 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 a8ee2ca1f4a1..7f7b1f59b5f0 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 @@ end: 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); -- 2.20.1