[dpdk-dev] [PATCH 5/5] net/mlx5: add RH7.2 VXLAN device metadata workaround

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

RH7.2 with kernel 3.10.0-327 does not support VXLAN
devices metadata and IFLA_VXLAN_COLLECT_METADATA
key is neither defined nor supported. We must specify
VNI parameter, which will be actually ignored by kernel,
applied rules will be processed by mlx5 kernel driver
and the actual VNI from rules will be used.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow_tcf.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow_tcf.c b/drivers/net/mlx5/mlx5_flow_tcf.c
index 7f9a76c..72bad85 100644
--- a/drivers/net/mlx5/mlx5_flow_tcf.c
+++ b/drivers/net/mlx5/mlx5_flow_tcf.c
@@ -351,9 +351,8 @@ struct tc_tunnel_key {
 #define TCA_ACT_MAX_PRIO 32
 #endif
 
-/** UDP port range of VXLAN devices created by driver. */
-#define MLX5_VXLAN_PORT_MIN 30000
-#define MLX5_VXLAN_PORT_MAX 60000
+/** Parameters of VXLAN devices created by driver. */
+#define MLX5_VXLAN_DEFAULT_VNI	1
 #define MLX5_VXLAN_DEVICE_PFX "vmlx_"
 
 /** Tunnel action type, used for @p type in header structure. */
@@ -5115,7 +5114,6 @@ struct tcf_nlcb_context {
  * Pointer to created device structure on success,
  * NULL otherwise and rte_errno is set.
  */
-#ifdef HAVE_IFLA_VXLAN_COLLECT_METADATA
 static struct tcf_vtep*
 flow_tcf_vtep_create(struct mlx5_flow_tcf_context *tcf,
 		     uint16_t port, struct rte_flow_error *error)
@@ -5165,10 +5163,24 @@ struct tcf_nlcb_context {
 	mnl_attr_put_strz(nlh, IFLA_INFO_KIND, "vxlan");
 	na_vxlan = mnl_attr_nest_start(nlh, IFLA_INFO_DATA);
 	assert(na_vxlan);
+#ifdef HAVE_IFLA_VXLAN_COLLECT_METADATA
+	/*
+	 * RH 7.2 does not support metadata for tunnel device.
+	 * It does not matter because we are going to use the
+	 * hardware offload by mlx5 driver.
+	 */
 	mnl_attr_put_u8(nlh, IFLA_VXLAN_COLLECT_METADATA, 1);
+#endif
 	mnl_attr_put_u8(nlh, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, 1);
 	mnl_attr_put_u8(nlh, IFLA_VXLAN_LEARNING, 0);
 	mnl_attr_put_u16(nlh, IFLA_VXLAN_PORT, vxlan_port);
+#ifndef HAVE_IFLA_VXLAN_COLLECT_METADATA
+	/*
+	 *  We must specify VNI explicitly if metadata not supported.
+	 *  Note, VNI is transferred with native endianness format.
+	 */
+	mnl_attr_put_u16(nlh, IFLA_VXLAN_ID, MLX5_VXLAN_DEFAULT_VNI);
+#endif
 	mnl_attr_nest_end(nlh, na_vxlan);
 	mnl_attr_nest_end(nlh, na_info);
 	assert(sizeof(buf) >= nlh->nlmsg_len);
@@ -5237,19 +5249,6 @@ struct tcf_nlcb_context {
 	rte_free(vtep);
 	return NULL;
 }
-#else
-static struct tcf_vtep*
-flow_tcf_vtep_create(struct mlx5_flow_tcf_context *tcf __rte_unused,
-		     uint16_t port __rte_unused,
-		     struct rte_flow_error *error)
-{
-	rte_flow_error_set(error, ENOTSUP,
-			   RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
-			   "netlink: failed to create VTEP, "
-			   "vxlan metadata are not supported by kernel");
-	return NULL;
-}
-#endif /* HAVE_IFLA_VXLAN_COLLECT_METADATA */
 
 /**
  * Acquire target interface index for VXLAN tunneling decapsulation.
-- 
1.8.3.1