[PATCH net v2 2/2] net/mlx5: HWS, fix modify header pool match for copy actions
flat view
COOLING10d
SUPERSEDED
From: Alexandre Cassen <hidden>
Date: 2026-10-12 10:19:46
Also in:
linux-rdma
Subsystem:
mellanox mlx5 core vpi driver, networking drivers, the rest · Maintainers:
Saeed Mahameed, Leon Romanovsky, Tariq Toukan, Mark Bloch, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Status: Superseded by v3 (posted 2026-10-19). [go to v3]
Revision v2 (2 revisions archived).
Revisions (2)
- v2 current
- v3 [diff against previous]
mlx5_fs_hws_mh_pool_match() compares a single dword of each action
since rules pass their values as arguments. Copy and add_field actions
keep their destination in the second dword and HWS reads them from the
pattern alone. Two modify headers whose copies differ only in
destination then share a pool and the second rule writes to the wrong
field.
Use the HWS core comparison that checks these actions in full.
Found while checking a Sashiko AI review report and confirmed against
the HWS pattern code. Not reproduced. No in-kernel user puts such
actions on the FDB but RDMA flow actions can.
Fixes: b36315ca69cb ("net/mlx5: fs, add HWS modify header API function")
Signed-off-by: Alexandre Cassen <redacted>
---
.../mlx5/core/steering/hws/fs_hws_pools.c | 10 +++-------
.../mellanox/mlx5/core/steering/hws/mlx5hws.h | 15 +++++++++++++++
.../mellanox/mlx5/core/steering/hws/pat_arg.c | 8 ++++----
3 files changed, 22 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c
index 86828e329187..cd888756e942 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws_pools.c@@ -389,7 +389,7 @@ bool mlx5_fs_hws_mh_pool_match(struct mlx5_fs_pool *mh_pool, struct mlx5hws_action_mh_pattern *pattern) { struct mlx5hws_action_mh_pattern *pool_pattern; - int num_actions, i; + int num_actions; pool_pattern = mh_pool->pool_ctx; if (WARN_ON_ONCE(!pool_pattern))
@@ -398,12 +398,8 @@ bool mlx5_fs_hws_mh_pool_match(struct mlx5_fs_pool *mh_pool, if (pattern->sz != pool_pattern->sz) return false; num_actions = pattern->sz / MLX5_UN_SZ_BYTES(set_add_copy_action_in_auto); - for (i = 0; i < num_actions; i++) { - if ((__force __be32)pattern->data[i] != - (__force __be32)pool_pattern->data[i]) - return false; - } - return true; + return mlx5hws_pat_compare_pattern(num_actions, pool_pattern->data, + num_actions, pattern->data); } struct mlx5hws_action *mlx5_fc_get_hws_action(struct mlx5hws_context *ctx,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws.h
index 1ad7a50d938b..13e9cdbc5d47 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws.h@@ -688,6 +688,21 @@ mlx5hws_action_create_modify_header(struct mlx5hws_context *ctx, u32 log_bulk_size, u32 flags); +/** + * mlx5hws_pat_compare_pattern - Compare two modify header patterns. + * + * @cur_num_of_actions: Number of actions in "cur_actions" array. + * @cur_actions: First pattern actions. + * @num_of_actions: Number of actions in "actions" array. + * @actions: Second pattern actions. + * + * Return: true if the patterns differ only in values, false otherwise. + */ +bool mlx5hws_pat_compare_pattern(int cur_num_of_actions, + __be64 cur_actions[], + int num_of_actions, + __be64 actions[]); + /** * mlx5hws_action_create_aso_meter - Create direct rule ASO flow meter action. *
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.c
index 512299b59fd0..a49115f04025 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.c@@ -96,10 +96,10 @@ void mlx5hws_pat_uninit_pattern_cache(struct mlx5hws_pattern_cache *cache) kfree(cache); } -static bool mlx5hws_pat_compare_pattern(int cur_num_of_actions, - __be64 cur_actions[], - int num_of_actions, - __be64 actions[]) +bool mlx5hws_pat_compare_pattern(int cur_num_of_actions, + __be64 cur_actions[], + int num_of_actions, + __be64 actions[]) { int i;
--
2.43.0