netdev - [PATCH v2 net-next 1/5] net/flow_dissector: Save vlan ethertype from headers

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Date:   Fri,  6 Jul 2018 05:38:12 +0000
From:   Jianbo Liu <jianbol@...lanox.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, jiri@...nulli.us
Cc:     Jianbo Liu <jianbol@...lanox.com>, Jiri Pirko <jiri@...lanox.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Andrew Lunn <andrew@...n.ch>, Tom Herbert <tom@...ntonium.net>,
        John Crispin <john@...ozen.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sven Eckelmann <sven.eckelmann@...nmesh.com>,
        WANG Cong <xiyou.wangcong@...il.com>,
        David Ahern <dsahern@...il.com>,
        Jon Maloy <jon.maloy@...csson.com>
Subject: [PATCH v2 net-next 1/5] net/flow_dissector: Save vlan ethertype from headers

Change vlan dissector key to save vlan tpid to support both 802.1Q
and 802.1AD ethertype.

Signed-off-by: Jianbo Liu <jianbol@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/flow_dissector.h | 2 +-
 net/core/flow_dissector.c    | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index adc24df5..8f89968 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -47,7 +47,7 @@ struct flow_dissector_key_tags {
 struct flow_dissector_key_vlan {
 	u16	vlan_id:12,
 		vlan_priority:3;
-	u16	padding;
+	__be16	vlan_tpid;
 };
 
 struct flow_dissector_key_mpls {
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 53f96e4..18cb99b 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -751,6 +751,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 		const struct vlan_hdr *vlan;
 		struct vlan_hdr _vlan;
 		bool vlan_tag_present = skb && skb_vlan_tag_present(skb);
+		__be16 saved_vlan_tpid = proto;
 
 		if (vlan_tag_present)
 			proto = skb->protocol;
@@ -789,6 +790,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 					(ntohs(vlan->h_vlan_TCI) &
 					 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 			}
+			key_vlan->vlan_tpid = saved_vlan_tpid;
 		}
 
 		fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
-- 
2.9.5