From: Michael Guralnik <michaelgur@nvidia.com>
Date: Wed, 10 Jun 2026 00:01:38 +0000 (+0300)
Subject: RDMA/mlx5: Fix TPH extraction in FRMR pool key
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe683274fee497834d2e6b54b7342642e1f21892;p=thirdparty%2Fkernel%2Flinux.git

RDMA/mlx5: Fix TPH extraction in FRMR pool key

Fix reading the PH value from the FRMR pool key by shifting the pool key
to the relevant bits.

Fixes: 36680ef7bceb ("RDMA/mlx5: Switch from MR cache to FRMR pools")
Link: https://patch.msgid.link/r/20260610000145.820592-3-michaelgur@nvidia.com
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index a0f23339387b3..6e7de9d2f0bd1 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -31,6 +31,7 @@
  * SOFTWARE.
  */
 
+#include <linux/bitfield.h>
 #include <linux/kref.h>
 #include <linux/random.h>
 #include <linux/debugfs.h>
@@ -163,9 +164,8 @@ static int get_unchangeable_access_flags(struct mlx5_ib_dev *dev,
 #define MLX5_FRMR_POOLS_KEY_VENDOR_KEY_SUPPORTED \
 	MLX5_FRMR_POOLS_KEY_ACCESS_MODE_KSM_MASK
 
-#define MLX5_FRMR_POOLS_KERNEL_KEY_PH_SHIFT 16
-#define MLX5_FRMR_POOLS_KERNEL_KEY_PH_MASK 0xFF0000
-#define MLX5_FRMR_POOLS_KERNEL_KEY_ST_INDEX_MASK 0xFFFF
+#define MLX5_FRMR_POOLS_KERNEL_KEY_PH_MASK GENMASK_ULL(23, 16)
+#define MLX5_FRMR_POOLS_KERNEL_KEY_ST_INDEX_MASK GENMASK_ULL(15, 0)
 
 static struct mlx5_ib_mr *
 _mlx5_frmr_pool_alloc(struct mlx5_ib_dev *dev, struct ib_umem *umem,
@@ -194,7 +194,8 @@ _mlx5_frmr_pool_alloc(struct mlx5_ib_dev *dev, struct ib_umem *umem,
 		ph ^= MLX5_IB_NO_PH;
 
 	mr->ibmr.frmr.key.kernel_vendor_key =
-		st_index | (ph << MLX5_FRMR_POOLS_KERNEL_KEY_PH_SHIFT);
+		FIELD_PREP(MLX5_FRMR_POOLS_KERNEL_KEY_ST_INDEX_MASK, st_index) |
+		FIELD_PREP(MLX5_FRMR_POOLS_KERNEL_KEY_PH_MASK, ph);
 	err = ib_frmr_pool_pop(&dev->ib_dev, &mr->ibmr);
 	if (err) {
 		kfree(mr);
@@ -271,9 +272,10 @@ static int mlx5r_create_mkeys(struct ib_device *device, struct ib_frmr_key *key,
 		 get_mkc_octo_size(access_mode, key->num_dma_blocks));
 	MLX5_SET(mkc, mkc, log_page_size, PAGE_SHIFT);
 
-	st_index = key->kernel_vendor_key &
-		   MLX5_FRMR_POOLS_KERNEL_KEY_ST_INDEX_MASK;
-	ph = key->kernel_vendor_key & MLX5_FRMR_POOLS_KERNEL_KEY_PH_MASK;
+	st_index = FIELD_GET(MLX5_FRMR_POOLS_KERNEL_KEY_ST_INDEX_MASK,
+			     key->kernel_vendor_key);
+	ph = FIELD_GET(MLX5_FRMR_POOLS_KERNEL_KEY_PH_MASK,
+		       key->kernel_vendor_key);
 	if (ph) {
 		/* Normalize ph: swap MLX5_IB_NO_PH for 0 */
 		if (ph == MLX5_IB_NO_PH)