netdev - Re: [patch net-next-2.6] net: comment rx

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Date:	Sat, 05 Mar 2011 16:27:52 +0100
From:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
CC:	Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org,
	davem@...emloft.net, shemminger@...ux-foundation.org,
	kaber@...sh.net, fubar@...ibm.com, eric.dumazet@...il.com,
	andy@...yhouse.net
Subject: Re: [patch net-next-2.6] net: comment rx_handler results

Le 05/03/2011 16:13, Jiri Pirko a écrit :
>
> Signed-off-by: Jiri Pirko<jpirko@...hat.com>
> ---
>   include/linux/netdevice.h |   12 ++++++++----
>   1 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 48a9638..26e03f9 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -391,10 +391,14 @@ enum gro_result {
>   typedef enum gro_result gro_result_t;
>
>   enum rx_handler_result {
> -	RX_HANDLER_CONSUMED,
> -	RX_HANDLER_ANOTHER,
> -	RX_HANDLER_EXACT,
> -	RX_HANDLER_PASS,
> +	RX_HANDLER_CONSUMED,	/* skb was consumed by rx_handler,
> +				   do not process it further. */
> +	RX_HANDLER_ANOTHER,	/* Do another round in receive path.
> +				   This is indicated in case skb->dev
> +				   was changed by rx_handler */
> +	RX_HANDLER_EXACT,	/* Force exact delivery, no wildcard */
> +	RX_HANDLER_PASS,	/* Do nothing, pass the skb as if
> +				   no rx_handler was called */

Changing skb->dev should always cause another_round.

So, RX_HANDLER_ANOTHER could be removed and replaced with a test for skb->dev change, with 
RX_HANDER_EXACT and RX_HANDLER_PASS.

 > +	RX_HANDLER_CONSUMED,	/* skb was consumed by rx_handler,
 > +				   do not process it further. */
 > +	RX_HANDLER_EXACT,	/* Force exact delivery, no wildcard */
 > +	RX_HANDLER_PASS,	/* Do normal (wildcard and exact) delivery */

And any rx_handler returning RX_HANDLER_EXACT should cause exact delivery, even if possible next 
rx_handlers return RX_HANDLER_PASS.

	Nicolas.
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