netdev - [PATCH net-next 18/27] net/skbuff: add macros for VLAN

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Date:   Tue, 13 Dec 2016 01:12:38 +0100 (CET)
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     netdev@...r.kernel.org
Cc:     Russell King <linux@...linux.org.uk> (maintainer:ARM PORT),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM PORT),
        Ralf Baechle <ralf@...ux-mips.org> (supporter:MIPS),
        linux-mips@...ux-mips.org (open list:MIPS),
        Benjamin Herrenschmidt <benh@...nel.crashing.org> (supporter:LINUX
        FOR POWERPC (32-BIT AND 64-BIT)),
        Paul Mackerras <paulus@...ba.org> (supporter:LINUX FOR POWERPC
        (32-BIT AND 64-BIT)),
        Michael Ellerman <mpe@...erman.id.au> (supporter:LINUX FOR POWERPC
        (32-BIT AND 64-BIT),commit_signer:2/5=40%),
        linuxppc-dev@...ts.ozlabs.org (open list:LINUX FOR POWERPC (32-BIT AND
        64-BIT)),
        "David S. Miller" <davem@...emloft.net> (maintainer:SPARC + UltraSPARC
        (sparc/sparc64),commit_signer:2/4=50%),
        sparclinux@...r.kernel.org (open list:SPARC + UltraSPARC
        (sparc/sparc64))
Subject: [PATCH net-next 18/27] net/skbuff: add macros for VLAN_PRESENT bit

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 include/linux/skbuff.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 332e767..4a85a1f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -768,6 +768,12 @@ struct sk_buff {
 	__u32			priority;
 	int			skb_iif;
 	__u32			hash;
+#define PKT_VLAN_PRESENT_BIT	4	// CFI (12-th bit) in TCI
+#ifdef __BIG_ENDIAN
+#define PKT_VLAN_PRESENT_OFFSET()	offsetof(struct sk_buff, vlan_tci)
+#else
+#define PKT_VLAN_PRESENT_OFFSET()	(offsetof(struct sk_buff, vlan_tci) + 1)
+#endif
 	__be16			vlan_proto;
 	__u16			vlan_tci;
 #if defined(CONFIG_NET_RX_BUSY_POLL) || defined(CONFIG_XPS)
-- 
2.10.2