[dpdk-dev] [PATCH v2] net/mlx5: fix default mark copy flow

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

In extensive metadata mode the MARK copy table is engaged,
if the application creates the flow with zero MARK ID action:

flow create 1 ingress pattern eth / ... / end actions mark id 0 / .. end

And then destroys that, the traffic to the port stops. This happens
due to default flow for the copy table has the zero ID and is removed
with the application rule. The patch extends internal ID variable
to 64 bits and provide the UINT64_MAX ID for the copy table default
rule.

Fixes: dd3c774f6ffb ("net/mlx5: add metadata register copy table")

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5_defs.h |  1 +
 drivers/net/mlx5/mlx5_flow.c | 13 +++++++------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h
index 9e113c5..042e1f3 100644
--- a/drivers/net/mlx5/mlx5_defs.h
+++ b/drivers/net/mlx5/mlx5_defs.h
@@ -174,6 +174,7 @@
 /* Size of the simple hash table for metadata register table. */
 #define MLX5_FLOW_MREG_HTABLE_SZ 4096
 #define MLX5_FLOW_MREG_HNAME "MARK_COPY_TABLE"
+#define MLX5_DEFAULT_COPY_ID UINT32_MAX
 
 /* Definition of static_assert found in /usr/include/assert.h */
 #ifndef HAVE_STATIC_ASSERT
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 5c78ea7..0087163 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -2947,16 +2947,16 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 	mcp_res = (void *)mlx5_hlist_lookup(priv->mreg_cp_tbl, mark_id);
 	if (mcp_res) {
 		/* For non-default rule. */
-		if (mark_id)
+		if (mark_id != MLX5_DEFAULT_COPY_ID)
 			mcp_res->refcnt++;
-		assert(mark_id || mcp_res->refcnt == 1);
+		assert(mark_id != MLX5_DEFAULT_COPY_ID || mcp_res->refcnt == 1);
 		return mcp_res;
 	}
 	/* Provide the full width of FLAG specific value. */
 	if (mark_id == (priv->sh->dv_regc0_mask & MLX5_FLOW_MARK_DEFAULT))
 		tag_spec.data = MLX5_FLOW_MARK_DEFAULT;
 	/* Build a new flow. */
-	if (mark_id) {
+	if (mark_id != MLX5_DEFAULT_COPY_ID) {
 		items[0] = (struct rte_flow_item){
 			.type = MLX5_RTE_FLOW_ITEM_TYPE_TAG,
 			.spec = &tag_spec,
@@ -3054,7 +3054,7 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 	}
 	/*
 	 * We do not check availability of metadata registers here,
-	 * because copy resources are allocated in this case.
+	 * because copy resources are not allocated in this case.
 	 */
 	if (--mcp_res->refcnt)
 		return;
@@ -3133,7 +3133,8 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 	/* Check if default flow is registered. */
 	if (!priv->mreg_cp_tbl)
 		return;
-	mcp_res = (void *)mlx5_hlist_lookup(priv->mreg_cp_tbl, 0ULL);
+	mcp_res = (void *)mlx5_hlist_lookup(priv->mreg_cp_tbl,
+					    MLX5_DEFAULT_COPY_ID);
 	if (!mcp_res)
 		return;
 	assert(mcp_res->flow);
@@ -3166,7 +3167,7 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 	    !mlx5_flow_ext_mreg_supported(dev) ||
 	    !priv->sh->dv_regc0_mask)
 		return 0;
-	mcp_res = flow_mreg_add_copy_action(dev, 0, error);
+	mcp_res = flow_mreg_add_copy_action(dev, MLX5_DEFAULT_COPY_ID, error);
 	if (!mcp_res)
 		return -rte_errno;
 	return 0;
-- 
1.8.3.1