netdev - [PATCH V4 1/3] can: add can_is_canfd

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Date:	Fri, 7 Nov 2014 16:45:12 +0800
From:	Dong Aisheng <b29396@...escale.com>
To:	<linux-can@...r.kernel.org>
CC:	<mkl@...gutronix.de>, <wg@...ndegger.com>,
	<varkabhadram@...il.com>, <netdev@...r.kernel.org>,
	<socketcan@...tkopp.net>, <b29396@...escale.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH V4 1/3] can: add can_is_canfd_skb() API

The CAN device drivers can use it to check if the frame to send is on
CAN FD mode or normal CAN mode.

Acked-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: Dong Aisheng <b29396@...escale.com>
---
ChangesLog:
 * v3->v4: add comments and change prototype a bit
 * v1->v2: change to skb->len == CANFD_MTU;
---
 include/linux/can/dev.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 6992afc..b37ea95 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -99,6 +99,12 @@ inval_skb:
 	return 1;
 }
 
+static inline bool can_is_canfd_skb(const struct sk_buff *skb)
+{
+	/* the CAN specific type of skb is identified by its data length */
+	return skb->len == CANFD_MTU;
+}
+
 /* get data length from can_dlc with sanitized can_dlc */
 u8 can_dlc2len(u8 can_dlc);
 
-- 
1.9.1

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