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

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Date:	Sat, 5 Mar 2011 16:37:05 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.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

Sat, Mar 05, 2011 at 04:27:52PM CET, nicolas.2p.debian@...il.com wrote:
>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.

Not if you reinject the skb.

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

That was there before. Needs extra variable and I think this way, via
results the code is much easier to read.

>
>> +	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.

When rx_handler returns RX_HANDLER_EXACT, there will bo no other call to
any rx_handler (that is the case only when RX_HANDLER_ANOTHER is
returned)
>
>	Nicolas.
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