Merge branch 'net-mlx5-hws-fix-modify-header-pattern-compare'

Alexandre Cassen says:

====================
net/mlx5: HWS, fix modify header pattern compare

The fs_hws modify header pools and the HWS pattern cache decide whether
two modify headers can share a pattern. Two bugs let different patterns
compare equal:

- On big-endian the HWS core comparison checks the data dword of each
  action instead of its control dword.
- The fs_hws pool match ignores the destination of copy and add_field
  actions.

Patch 2 moves the pool match to the HWS core comparison that patch 1
fixes.

v2: https://lore.kernel.org/netdev/20261012101937.1335231-1-acassen@corp.free.fr/
v1: https://lore.kernel.org/netdev/20261010120147.135825-1-acassen@corp.free.fr/
====================

Link: https://patch.msgid.link/20261019133159.1742411-1-acassen@corp.free.fr
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

3 files changed, 15 insertions, 13 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..05aa143fa088 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
@@ -3,6 +3,7 @@
 
 #include <mlx5_core.h>
 #include "fs_hws_pools.h"
+#include "internal.h"
 
 #define MLX5_FS_HWS_DEFAULT_BULK_LEN 65536
 #define MLX5_FS_HWS_POOL_MAX_THRESHOLD BIT(18)
@@ -389,7 +390,7 @@ 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 +399,8 @@ 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/pat_arg.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.c
index 9af449c2b4d5..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;
 
@@ -116,8 +116,8 @@ static bool mlx5hws_pat_compare_pattern(int cur_num_of_actions,
 				return false;
 		} else {
 			/* Compare just the control, not the values */
-			if ((__force __be32)actions[i] !=
-			    (__force __be32)cur_actions[i])
+			if (*(__be32 *)&actions[i] !=
+			    *(__be32 *)&cur_actions[i])
 				return false;
 		}
 	}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.h
index 7fbd8dc7aa18..2be7787104e1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/hws/pat_arg.h
@@ -49,6 +49,11 @@ int mlx5hws_pat_init_pattern_cache(struct mlx5hws_pattern_cache **cache);
 
 void mlx5hws_pat_uninit_pattern_cache(struct mlx5hws_pattern_cache *cache);
 
+bool mlx5hws_pat_compare_pattern(int cur_num_of_actions,
+				 __be64 cur_actions[],
+				 int num_of_actions,
+				 __be64 actions[]);
+
 bool mlx5hws_pat_verify_actions(struct mlx5hws_context *ctx, __be64 pattern[], size_t sz);
 
 int mlx5hws_arg_create(struct mlx5hws_context *ctx,