net/mlx5: HWS, rework the check if matcher size can be increased

When checking if the matcher size can be increased, check both
match and action RTCs. Also, consider the increasing step - check
that it won't cause the new matcher size to become unsupported.

Additionally, since we're using '+ 1' for action RTC size yet
again, define it as macro and use in all the required places.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20250114130646.1937192-2-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c

@@ -468,8 +468,22 @@ hws_bwc_matcher_size_maxed_out(struct mlx5hws_bwc_matcher *bwc_matcher)
 {
 	struct mlx5hws_cmd_query_caps *caps = bwc_matcher->matcher->tbl->ctx->caps;
 
-	return bwc_matcher->size_log + MLX5HWS_MATCHER_ASSURED_MAIN_TBL_DEPTH >=
-	       caps->ste_alloc_log_max - 1;
+	/* check the match RTC size */
+	if ((bwc_matcher->size_log +
+	     MLX5HWS_MATCHER_ASSURED_MAIN_TBL_DEPTH +
+	     MLX5HWS_BWC_MATCHER_SIZE_LOG_STEP) >
+	    (caps->ste_alloc_log_max - 1))
+		return true;
+
+	/* check the action RTC size */
+	if ((bwc_matcher->size_log +
+	     MLX5HWS_BWC_MATCHER_SIZE_LOG_STEP +
+	     ilog2(roundup_pow_of_two(bwc_matcher->matcher->action_ste.max_stes)) +
+	     MLX5HWS_MATCHER_ACTION_RTC_UPDATE_MULT) >
+	    (caps->ste_alloc_log_max - 1))
+		return true;
+
+	return false;
 }
 
 static bool

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/matcher.c

@@ -289,7 +289,8 @@ static int hws_matcher_create_rtc(struct mlx5hws_matcher *matcher,
 		 *     (2 to support writing new STEs for update rule))
 		 */
 		ste->order = ilog2(roundup_pow_of_two(action_ste->max_stes)) +
-			     attr->table.sz_row_log + 1;
+			     attr->table.sz_row_log +
+			     MLX5HWS_MATCHER_ACTION_RTC_UPDATE_MULT;
 		rtc_attr.log_size = ste->order;
 		rtc_attr.log_depth = 0;
 		rtc_attr.update_index_mode = MLX5_IFC_RTC_STE_UPDATE_MODE_BY_OFFSET;
@@ -561,7 +562,8 @@ static int hws_matcher_bind_at(struct mlx5hws_matcher *matcher)
 	pool_attr.flags = MLX5HWS_POOL_FLAGS_FOR_STE_ACTION_POOL;
 	/* Pool size is similar to action RTC size */
 	pool_attr.alloc_log_sz = ilog2(roundup_pow_of_two(action_ste->max_stes)) +
-				 matcher->attr.table.sz_row_log + 1;
+				 matcher->attr.table.sz_row_log +
+				 MLX5HWS_MATCHER_ACTION_RTC_UPDATE_MULT;
 	hws_matcher_set_pool_attr(&pool_attr, matcher);
 	action_ste->pool = mlx5hws_pool_create(ctx, &pool_attr);
 	if (!action_ste->pool) {

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/matcher.h

@@ -18,6 +18,11 @@
 /* Required depth of the main large table */
 #define MLX5HWS_MATCHER_ASSURED_MAIN_TBL_DEPTH 2
 
+/* Action RTC size multiplier that is required in order
+ * to support rule update for rules with action STEs.
+ */
+#define MLX5HWS_MATCHER_ACTION_RTC_UPDATE_MULT 1
+
 enum mlx5hws_matcher_offset {
 	MLX5HWS_MATCHER_OFFSET_TAG_DW1 = 12,
 	MLX5HWS_MATCHER_OFFSET_TAG_DW0 = 13,