netdev - Re: [UDP6]: Restore sk

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Message-Id: <20071029.154150.106134742.yoshfuji@linux-ipv6.org>
Date:	Mon, 29 Oct 2007 15:41:50 +0900 (JST)
From:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
To:	mitch@...ux.vnet.ibm.com, herbert@...dor.apana.org.au
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org
Subject: Re: [UDP6]: Restore sk_filter optimisation

In article <20071029153320.d2c00f62.mitch@...ux.vnet.ibm.com> (at Mon, 29 Oct 2007 15:33:20 +0900), Mitsuru Chinen <mitch@...ux.vnet.ibm.com> says:

> Hello Herbert,
> 
> Let me ask a question about this patch.
> After this patch was applied, 2 of the protocol stack behaviors were
> changed when it receives a UDP datagram with broken checksum:
> 
>  1. udp6InDatagrams is incremented instead of udpInErrors
>  2. In userland, recvfrom() replies an error with EAGAIN.
>     recvfrom() wasn't aware of such a packet before.
> 
> Are these changes intentional?

And, we're not sure how much the "optimization"'s benefit is.
It is even worse when we are handling multicast packets.

--yoshfuji
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