netdev - Re: [net-next 1/1] tipc: enforce valid ratio between skb truesize and contents

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Date:   Thu, 16 Nov 2017 10:50:48 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     jon.maloy@...csson.com
Cc:     netdev@...r.kernel.org,
        mohan.krishna.ghanta.krishnamurthy@...csson.com,
        tung.q.nguyen@...tech.com.au, hoang.h.le@...tech.com.au,
        canh.d.luu@...tech.com.au, ying.xue@...driver.com,
        tipc-discussion@...ts.sourceforge.net
Subject: Re: [net-next 1/1] tipc: enforce valid ratio between skb truesize
 and contents

From: Jon Maloy <jon.maloy@...csson.com>
Date: Wed, 15 Nov 2017 21:23:56 +0100

> The socket level flow control is based on the assumption that incoming
> buffers meet the condition (skb->truesize / roundup(skb->len) <= 4),
> where the latter value is rounded off upwards to the nearest 1k number.
> This does empirically hold true for the device drivers we know, but we
> cannot trust that it will always be so, e.g., in a system with jumbo
> frames and very small packets.
> 
> We now introduce a check for this condition at packet arrival, and if
> we find it to be false, we copy the packet to a new, smaller buffer,
> where the condition will be true. We expect this to affect only a small
> fraction of all incoming packets, if at all.
> 
> Acked-by: Ying Xue <ying.xue@...driver.com>
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>

Applied.