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Date:   Mon, 29 Aug 2016 12:22:37 -0700
From:   Eric Dumazet <>
To:     Marcelo Ricardo Leitner <>
Cc:     David Miller <>,
        netdev <>,
        Neal Cardwell <>,
        Yuchung Cheng <>
Subject: Re: [PATCH net-next] tcp: add tcp_add_backlog()

On Mon, 2016-08-29 at 15:51 -0300, Marcelo Ricardo Leitner wrote:
> 	skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
> Shouldn't __pskb_pull_tail() already fix this? As it seems the expected
> behavior and it would have a more global effect then. For drivers not
> using copybreak, that's needed here anyway, but maybe this help other
> protocols/situations too.

That would be difficult, because some callers do their own truesize
tacking (skb might be attached/charged to a socket, so changing
skb->truesize would need to adjust the amount that was charged)

This is why pskb_expand_head() is not allowed to mess with skb->truesize
(but in the opposite way, since we probably are increasing

Not sure it is worth the pain in fast path, where packets are consumed
so fast that their skb->truesize being slightly over estimated is not an

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