netdev - Re: [PATCH] net/hyperv: fix the issue that large packets be dropped by bridge

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Date:	Wed, 01 Feb 2012 23:07:33 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	weiyj.lk@...il.com
Cc:	haiyangz@...rosoft.com, kys@...rosoft.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net/hyperv: fix the issue that large packets be
 dropped by bridge

From: Wei Yongjun <weiyj.lk@...il.com>
Date: Thu, 2 Feb 2012 10:43:50 +0800

> On 02/02/2012 03:28 AM, David Miller wrote:
>> From: Wei Yongjun <weiyj.lk@...il.com>
>> Date: Mon, 30 Jan 2012 16:12:45 +0800
>>
>>> +	/*
>>> +	 * Make sure we got a valid packet message, now total_data_buflen
>>> +	 * should be the data packet size plus the trailer padding size
>>> +	 */
>>> +	if (pkt->total_data_buflen < rndis_pkt->data_len) {
>>> +		netdev_err(dev->net_dev->ndev, "incoming packet message "
>>> +			   "buffer overflow detected (got %u, min %u)"
>>> +			   "...dropping this message!\n",
>>> +			   pkt->total_data_buflen, rndis_pkt->data_len);
>>> +		return;
>>> +	}
>> This is inappropriate.  Any logging message that is potentially remotely
>> triggerable must at a minimum be rate limited.  But to be honest I'd
>> much prefer a statistic counter for this kind of event, rather then
>> a log message.
> Maybe the badly described error message confuse you, this error can not be
> triggered remotely, it is the RNDIS control messages, which is sent
> between the host and the RNDIS device.
> 
> Remain this error message may help us to detect the host device driver
> bugs or the netvsc ringbuffer bugs.
> 
> So how about to change the error message?

Ok.
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