linux-kernel - [PATCH 2/4] net-next: dsa: add flow_dissect callback to struct dsa_device

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Date:   Wed,  9 Aug 2017 14:41:17 +0200
From:   John Crispin <john@...ozen.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sean Wang <sean.wang@...iatek.com>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Muciri Gatimu <muciri@...nmesh.com>,
        Shashidhar Lakkavalli <shashidhar.lakkavalli@...nmesh.com>,
        John Crispin <john@...ozen.org>
Subject: [PATCH 2/4] net-next: dsa: add flow_dissect callback to struct dsa_device_ops

When the flow dissector first sees packets coming in on a DSA devices the
802.3 header wont be located where the code expects it to be as the tag
is still present. Adding this new callback allows a DSA device to provide a
new function that the flow_dissector can use to get the correct protocol
and offset of the network header.

Signed-off-by: Muciri Gatimu <muciri@...nmesh.com>
Signed-off-by: Shashidhar Lakkavalli <shashidhar.lakkavalli@...nmesh.com>
Signed-off-by: John Crispin <john@...ozen.org>
---
 include/net/dsa.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 65d7804c6f69..7f46b521313e 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -106,6 +106,8 @@ struct dsa_device_ops {
 	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
 			       struct packet_type *pt,
 			       struct net_device *orig_dev);
+	int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
+			    int *offset);
 };
 
 struct dsa_switch_tree {
-- 
2.11.0