[dpdk-dev] [PATCH v5 1/2] net/mlx5: fix crashing testpmd on null drv opts

[Moti Haimovsky <motih@mellanox.com>]

mlx5 implements mlx5_flow_null_drv_ops to be used when a specific
flow typei/driver is not available or invalid.
This routines return error without modifying the rte_flow_error
parameter passed to them which causes testpmd, for example, to crash.
This commit addresses the issue by modifying the rte_flow_error
parameter in theses routines.

Fixes: 0c76d1c9a18d ("net/mlx5: add abstraction for multiple flow drivers")
Fixes: 684dafe795d0 ("net/mlx5: add flow query abstraction interface")
Cc: stable@dpdk.org

Signed-off-by: Moti Haimovsky <motih@mellanox.com>
---
v4, v5:
 * Resend the message from a server not inserting DOS line-termination
   symbols.

v3:
 * Modified patch subject.

v2:
 * Fixed checkpatch warnings.
---

 drivers/net/mlx5/mlx5_flow.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 9887018..e5a8e33 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -1694,19 +1694,20 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		   const struct rte_flow_attr *attr __rte_unused,
 		   const struct rte_flow_item items[] __rte_unused,
 		   const struct rte_flow_action actions[] __rte_unused,
-		   struct rte_flow_error *error __rte_unused)
+		   struct rte_flow_error *error)
 {
-	rte_errno = ENOTSUP;
-	return -rte_errno;
+	return rte_flow_error_set(error, ENOTSUP,
+				  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, NULL);
 }
 
 static struct mlx5_flow *
 flow_null_prepare(const struct rte_flow_attr *attr __rte_unused,
 		  const struct rte_flow_item items[] __rte_unused,
 		  const struct rte_flow_action actions[] __rte_unused,
-		  struct rte_flow_error *error __rte_unused)
+		  struct rte_flow_error *error)
 {
-	rte_errno = ENOTSUP;
+	rte_flow_error_set(error, ENOTSUP,
+			   RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, NULL);
 	return NULL;
 }
 
@@ -1716,19 +1717,19 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		    const struct rte_flow_attr *attr __rte_unused,
 		    const struct rte_flow_item items[] __rte_unused,
 		    const struct rte_flow_action actions[] __rte_unused,
-		    struct rte_flow_error *error __rte_unused)
+		    struct rte_flow_error *error)
 {
-	rte_errno = ENOTSUP;
-	return -rte_errno;
+	return rte_flow_error_set(error, ENOTSUP,
+				  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, NULL);
 }
 
 static int
 flow_null_apply(struct rte_eth_dev *dev __rte_unused,
 		struct rte_flow *flow __rte_unused,
-		struct rte_flow_error *error __rte_unused)
+		struct rte_flow_error *error)
 {
-	rte_errno = ENOTSUP;
-	return -rte_errno;
+	return rte_flow_error_set(error, ENOTSUP,
+				  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, NULL);
 }
 
 static void
@@ -1748,10 +1749,10 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		struct rte_flow *flow __rte_unused,
 		const struct rte_flow_action *actions __rte_unused,
 		void *data __rte_unused,
-		struct rte_flow_error *error __rte_unused)
+		struct rte_flow_error *error)
 {
-	rte_errno = ENOTSUP;
-	return -rte_errno;
+	return rte_flow_error_set(error, ENOTSUP,
+				  RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL, NULL);
 }
 
 /* Void driver to protect from null pointer reference. */
-- 
1.8.3.1