netdev - Re: [PATCH net-next] tcp: reduce skb overhead in selected places

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Message-ID: <1485369532.5145.50.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 25 Jan 2017 10:38:52 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: reduce skb overhead in selected places

On Wed, 2017-01-25 at 13:17 -0500, David Miller wrote:

> Applied, thanks Eric.

Thanks David.

It looks IPv6 potential big network headers are also a threat :

Various pskb_may_pull() to pull headers might reallocate skb->head,
but skb->truesize is not updated in __pskb_pull_tail()

We probably need to update skb->truesize, but it is tricky as the prior
skb->truesize value might have been used for memory accounting when skb
was stored in some queue.

Do you think we could change __pskb_pull_tail() right away and fix the
few places that would break, or should we add various helpers with extra
parameters to take a safe route ?