netdev - Re: ICMP packets - ll_temac with Microblaze

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Date:	Wed, 21 Dec 2011 17:05:43 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jun Zhao <mypopydev@...il.com>
Cc:	monstr@...str.eu, David Miller <davem@...emloft.net>,
	John Williams <john.williams@...alogix.com>,
	netdev@...r.kernel.org
Subject: Re: ICMP packets - ll_temac with Microblaze

Le jeudi 22 décembre 2011 à 00:01 +0800, Jun Zhao a écrit :

> Why receive buffer size MUST bigger than the jumbo frames size even if
> the packet size is small?

Thats the way it is in linux.

We count the memory size used by the packet.

If not, a malicious attacker could send 1-byte frames and exhaust your
kernel memory.

If you want to reduce it, you might use copybreak : Some drivers copy
the data into a small skb instead of providing a jumbo frame to upper
stack.

tg3 for example.

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