[dpdk-dev] [PATCH v2 12/13] net/enic: fix an endian bug in VLAN match

[Hyong Youb Kim <hyonkim@cisco.com>]

The VLAN fields in the NIC filter use little endian. The VLAN item is
in big endian, so swap bytes.

Fixes: 6ced137607d0 ("net/enic: flow API for NICs with advanced filters enabled")
Cc: stable@dpdk.org

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
---
 doc/guides/nics/enic.rst     | 10 ++++++++--
 drivers/net/enic/enic_flow.c | 12 ++++++++----
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/doc/guides/nics/enic.rst b/doc/guides/nics/enic.rst
index c1415dc0d..d4241ef45 100644
--- a/doc/guides/nics/enic.rst
+++ b/doc/guides/nics/enic.rst
@@ -247,7 +247,7 @@ Generic Flow API is supported. The baseline support is:
   in the pattern.
 
   - Attributes: ingress
-  - Items: eth, ipv4, ipv6, udp, tcp, vxlan, inner eth, ipv4, ipv6, udp, tcp
+  - Items: eth, vlan, ipv4, ipv6, udp, tcp, vxlan, inner eth, vlan, ipv4, ipv6, udp, tcp
   - Actions: queue and void
   - Selectors: 'is', 'spec' and 'mask'. 'last' is not supported
   - In total, up to 64 bytes of mask is allowed across all headers
@@ -255,7 +255,7 @@ Generic Flow API is supported. The baseline support is:
 - **1300 and later series VICS with advanced filters enabled**
 
   - Attributes: ingress
-  - Items: eth, ipv4, ipv6, udp, tcp, vxlan, raw, inner eth, ipv4, ipv6, udp, tcp
+  - Items: eth, vlan, ipv4, ipv6, udp, tcp, vxlan, raw, inner eth, vlan, ipv4, ipv6, udp, tcp
   - Actions: queue, mark, drop, flag, rss, passthru, and void
   - Selectors: 'is', 'spec' and 'mask'. 'last' is not supported
   - In total, up to 64 bytes of mask is allowed across all headers
@@ -266,6 +266,12 @@ Generic Flow API is supported. The baseline support is:
 
   - Action: count
 
+The VIC performs packet matching after applying VLAN strip. If VLAN
+stripping is enabled, EtherType in the ETH item corresponds to the
+stripped VLAN header's EtherType. Stripping does not affect the VLAN
+item. TCI and EtherType in the VLAN item are matched against those in
+the (stripped) VLAN header whether stripping is enabled or disabled.
+
 More features may be added in future firmware and new versions of the VIC.
 Please refer to the release notes.
 
diff --git a/drivers/net/enic/enic_flow.c b/drivers/net/enic/enic_flow.c
index da43b31dc..b3172e7be 100644
--- a/drivers/net/enic/enic_flow.c
+++ b/drivers/net/enic/enic_flow.c
@@ -579,12 +579,16 @@ enic_copy_item_vlan_v2(struct copy_item_args *arg)
 		/* Outer TPID cannot be matched */
 		if (eth_mask->ether_type)
 			return ENOTSUP;
+		/*
+		 * When packet matching, the VIC always compares vlan-stripped
+		 * L2, regardless of vlan stripping settings. So, the inner type
+		 * from vlan becomes the ether type of the eth header.
+		 */
 		eth_mask->ether_type = mask->inner_type;
 		eth_val->ether_type = spec->inner_type;
-
-		/* Outer header. Use the vlan mask/val fields */
-		gp->mask_vlan = mask->tci;
-		gp->val_vlan = spec->tci;
+		/* For TCI, use the vlan mask/val fields (little endian). */
+		gp->mask_vlan = rte_be_to_cpu_16(mask->tci);
+		gp->val_vlan = rte_be_to_cpu_16(spec->tci);
 	} else {
 		/* Inner header. Mask/Val start at *inner_ofst into L5 */
 		if ((*inner_ofst + sizeof(struct vlan_hdr)) >
-- 
2.16.2