linux-kernel - [PATCH 5.1 296/405] IB/mlx5: Compare only index part of a memory window rkey

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Date:   Wed, 29 May 2019 20:04:54 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Artemy Kovalyov <artemyko@...lanox.com>,
        Moni Shoua <monis@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.1 296/405] 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@...lanox.com>
Signed-off-by: Moni Shoua <monis@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/hw/mlx5/odp.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 0aa10ebda5d9a..91669e35c6ca8 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;
-- 
2.20.1