[PATCH] common/mlx5: fix MR range calculation

[PATCH] common/mlx5: fix MR range calculation

[Dmitry Kozlyuk]

MR end for a mempool chunk may be calculated incorrectly.
For example, for chunk with addr=1.5M and len=1M with 2M page size
the range would be [0, 2M), while the proper result is [0, 4M).
Fix the calculation.

Fixes: 690b2a88c2f7 ("common/mlx5: add mempool registration facilities")
Cc: stable@dpdk.org

Signed-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/common/mlx5/mlx5_common_mr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/common/mlx5/mlx5_common_mr.c b/drivers/common/mlx5/mlx5_common_mr.c
index fa27bd98de..06e4c8f187 100644
--- a/drivers/common/mlx5/mlx5_common_mr.c
+++ b/drivers/common/mlx5/mlx5_common_mr.c
@@ -1289,11 +1289,12 @@ mlx5_range_from_mempool_chunk(struct rte_mempool *mp, void *opaque,
 			      unsigned int idx)
 {
 	struct mlx5_range *ranges = opaque, *range = &ranges[idx];
+	uintptr_t start = (uintptr_t)memhdr->addr;
 	uint64_t page_size = rte_mem_page_size();
 
 	RTE_SET_USED(mp);
-	range->start = RTE_ALIGN_FLOOR((uintptr_t)memhdr->addr, page_size);
-	range->end = RTE_ALIGN_CEIL(range->start + memhdr->len, page_size);
+	range->start = RTE_ALIGN_FLOOR(start, page_size);
+	range->end = RTE_ALIGN_CEIL(start + memhdr->len, page_size);
 }
 
 /**
-- 
2.25.1

RE: [PATCH] common/mlx5: fix MR range calculation

[Raslan Darawsheh]

Hi,

> -----Original Message-----
> From: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
> Sent: Thursday, March 31, 2022 5:33 PM
> To: dev@dpdk.org
> Cc: stable@dpdk.org; Matan Azrad <matan@nvidia.com>; Slava Ovsiienko
> <viacheslavo@nvidia.com>
> Subject: [PATCH] common/mlx5: fix MR range calculation
> 
> MR end for a mempool chunk may be calculated incorrectly.
> For example, for chunk with addr=1.5M and len=1M with 2M page size the
> range would be [0, 2M), while the proper result is [0, 4M).
> Fix the calculation.
> 
> Fixes: 690b2a88c2f7 ("common/mlx5: add mempool registration facilities")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
> Acked-by: Matan Azrad <matan@nvidia.com>

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh