diff options
| author | Artemy Kovalyov <artemyko@mellanox.com> | 2019-03-19 12:24:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 16:43:46 +0300 |
| commit | 1a2fdf1c536a81a39006506dc8567dc7d5ed0d7d (patch) | |
| tree | 5f7620266a262f7ef37e7b3d3d28833e3f6a7e65 /drivers/infiniband | |
| parent | 5e04fcbab4b417ac1110ec917f653d7eb38fd056 (diff) | |
| download | linux-1a2fdf1c536a81a39006506dc8567dc7d5ed0d7d.tar.xz | |
IB/mlx5: Compare only index part of a memory window rkey
[ Upstream commit d623dfd2836114507d647c9793a80d213d8bffe8 ]
The InfiniBand Architecture Specification section 10.6.7.2.4 TYPE 2 MEMORY
WINDOWS says that if the CI supports the Base Memory Management Extensions
defined in this specification, the R_Key format for a Type 2 Memory Window
must consist of:
* 24 bit index in the most significant bits of the R_Key, which is owned
by the CI, and
* 8 bit key in the least significant bits of the R_Key, which is owned by
the Consumer.
This means that the kernel should compare only the index part of a R_Key
to determine equality with another R_Key.
Fixes: db570d7deafb ("IB/mlx5: Add ODP support to MW")
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/odp.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c index 0aa10ebda5d9..91669e35c6ca 100644 --- a/drivers/infiniband/hw/mlx5/odp.c +++ b/drivers/infiniband/hw/mlx5/odp.c @@ -711,6 +711,15 @@ struct pf_frame { int depth; }; +static bool mkey_is_eq(struct mlx5_core_mkey *mmkey, u32 key) +{ + if (!mmkey) + return false; + if (mmkey->type == MLX5_MKEY_MW) + return mlx5_base_mkey(mmkey->key) == mlx5_base_mkey(key); + return mmkey->key == key; +} + static int get_indirect_num_descs(struct mlx5_core_mkey *mmkey) { struct mlx5_ib_mw *mw; @@ -760,7 +769,7 @@ static int pagefault_single_data_segment(struct mlx5_ib_dev *dev, next_mr: mmkey = __mlx5_mr_lookup(dev->mdev, mlx5_base_mkey(key)); - if (!mmkey || mmkey->key != key) { + if (!mkey_is_eq(mmkey, key)) { mlx5_ib_dbg(dev, "failed to find mkey %x\n", key); ret = -EFAULT; goto srcu_unlock; |