linux-kernel - Re: icmp: account for ICMP out errors because of socket limit

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Message-Id: <20140514.140753.222006976691406699.davem@davemloft.net>
Date:	Wed, 14 May 2014 14:07:53 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	zyjzyj2000@...il.com
Cc:	eric.dumazet@...il.com, Yue.Tao@...driver.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: icmp: account for ICMP out errors because of socket limit

From: zhuyj <zyjzyj2000@...il.com>
Date: Mon, 12 May 2014 11:19:28 +0800

> Hi, Eric && David
> 
>  ____           ______________
> |    |         |              |
> | PC |<------->| MIPS 32 core |
> |____|         |______________|
> 
> When ping from a PC to a board (MIPS 32 core), because of socket
> limit,
> ping echo will fail. But ICMP_MIB_OUTERRORS counter is not
> incremented.
> In this case, "netstat -s" can not report these errors.
> 
> This patch will fix this problem. Now it is in the attachment. Please
> check it.

The only time icmp_xmit_lock() can fail is if we try to generate an ICMP
response to a failure to send another ICMP packet.

It is an entirely different situation from Eric's other patch which
you've mentioned in this thread, and I do not think this case warrants
a statistic bump at all.
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