netdev - Re: [PATCH V3 1/3] can: add can_is_canfd

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Date:	Thu, 6 Nov 2014 09:52:28 +0800
From:	Dong Aisheng <b29396@...escale.com>
To:	Oliver Hartkopp <socketcan@...tkopp.net>
CC:	Eric Dumazet <eric.dumazet@...il.com>, <linux-can@...r.kernel.org>,
	<mkl@...gutronix.de>, <wg@...ndegger.com>,
	<varkabhadram@...il.com>, <netdev@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V3 1/3] can: add can_is_canfd_skb() API

On Wed, Nov 05, 2014 at 06:33:09PM +0100, Oliver Hartkopp wrote:
> On 05.11.2014 17:22, Eric Dumazet wrote:
> >On Wed, 2014-11-05 at 21:16 +0800, Dong Aisheng wrote:
> 
> >
> >This looks a bit strange to assume that skb->len == magical_value is CAN
> >FD. A comment would be nice.
> >
> 
> Yes. Due to exactly two types of struct can(fd)_frame which can be
> contained in a skb the skbs are distinguished by the length which
> can be either CAN_MTU or CANFD_MTU.
> 
> >>+static inline int can_is_canfd_skb(struct sk_buff *skb)
> >
> >static inline bool can_is_canfd_skb(const struct sk_buff *skb)
> >
> 
> ok.
> 

Got it.

> >>+{
> 
> What about:
> 
> 	/* the CAN specific type of skb is identified by its data length */
> 

Looks good to me.
I will send a updated version with these changes.

> >>+	return skb->len == CANFD_MTU;
> >>+}
> >>+
> >>  /* get data length from can_dlc with sanitized can_dlc */
> >>  u8 can_dlc2len(u8 can_dlc);
> 
> Regards,
> Oliver
>

Regards
Dong Aisheng
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