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-rw-r--r--src/plugins/dpdk/device/init.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c
index 1a7792bf197..eaeda32f3b7 100644
--- a/src/plugins/dpdk/device/init.c
+++ b/src/plugins/dpdk/device/init.c
@@ -695,19 +695,30 @@ dpdk_lib_init (dpdk_main_t * dm)
}
/*
- * For cisco VIC vNIC, set default to VLAN strip enabled, unless
- * specified otherwise in the startup config.
- * For other NICs default to VLAN strip disabled, unless specified
+ * A note on Cisco VIC (PMD_ENIC) and VLAN:
+ *
+ * With Cisco VIC vNIC, every ingress packet is tagged. On a
+ * trunk vNIC (C series "standalone" server), packets on no VLAN
+ * are tagged with vlan 0. On an access vNIC (standalone or B
+ * series "blade" server), packets on the default/native VLAN
+ * are tagged with that vNIC's VLAN. VPP expects these packets
+ * to be untagged, and previously enabled VLAN strip on VIC by
+ * default. But it also broke vlan sub-interfaces.
+ *
+ * The VIC adapter has "untag default vlan" ingress VLAN rewrite
+ * mode, which removes tags from these packets. VPP now includes
+ * a local patch for the enic driver to use this untag mode, so
+ * enabling vlan stripping is no longer needed. In future, the
+ * driver + dpdk will have an API to set the mode after
+ * rte_eal_init. Then, this note and local patch will be
+ * removed.
+ */
+
+ /*
+ * VLAN stripping: default to VLAN strip disabled, unless specified
* otherwise in the startup config.
*/
- if (xd->pmd == VNET_DPDK_PMD_ENIC)
- {
- if (devconf->vlan_strip_offload != DPDK_DEVICE_VLAN_STRIP_OFF)
- vlan_strip = 1; /* remove vlan tag from VIC port by default */
- else
- dpdk_log_warn ("VLAN strip disabled for interface\n");
- }
- else if (devconf->vlan_strip_offload == DPDK_DEVICE_VLAN_STRIP_ON)
+ if (devconf->vlan_strip_offload == DPDK_DEVICE_VLAN_STRIP_ON)
vlan_strip = 1;
if (vlan_strip)