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

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

[Viacheslav Ovsiienko]

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 | 19 ++++++++++---------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h
index 9e113c5..a577ad8 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 UINT64_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..f464d01 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -2903,7 +2903,7 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
  *   Associated resource on success, NULL otherwise and rte_errno is set.
  */
 static struct mlx5_flow_mreg_copy_resource *
-flow_mreg_add_copy_action(struct rte_eth_dev *dev, uint32_t mark_id,
+flow_mreg_add_copy_action(struct rte_eth_dev *dev, uint64_t mark_id,
 			  struct rte_flow_error *error)
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
@@ -2912,13 +2912,13 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		.ingress = 1,
 	};
 	struct mlx5_rte_flow_item_tag tag_spec = {
-		.data = mark_id,
+		.data = (uint32_t)(mark_id & UINT32_MAX),
 	};
 	struct rte_flow_item items[] = {
 		[1] = { .type = RTE_FLOW_ITEM_TYPE_END, },
 	};
 	struct rte_flow_action_mark ftag = {
-		.id = mark_id,
+		.id = (uint32_t)(mark_id & UINT32_MAX),
 	};
 	struct mlx5_flow_action_copy_mreg cp_mreg = {
 		.dst = REG_B,
@@ -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

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

[Matan Azrad]

From: Viacheslav Ovsiienko
> 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>
Acked-by: Matan Azrad <matan@mellanox.com>