From: Eric Dumazet <eric.dumazet@gmail.com>
To: Joe Smith <codesoldier1@gmail.com>
Cc: netdev@vger.kernel.org, David Miller <davem@davemloft.net>
Subject: Re: SKB Reference Question
Date: Wed, 01 Nov 2017 10:33:31 -0700 [thread overview]
Message-ID: <1509557611.3828.45.camel@edumazet-glaptop3.roam.corp.google.com> (raw)
In-Reply-To: <CABGNecw9thLB4XOFdWRghj6E_uMrFroVko-Up6hodS75hmb4sg@mail.gmail.com>
On Wed, 2017-11-01 at 10:27 -0700, Joe Smith wrote:
> How strictly are references on the SKB enforced. For example,
> tcp_transmit_skb() clones the SKB and adds a TCP header. Can I assume
> that in case of re-transmission the header added will be there and can
> be reused instead of creating a new one from scratch. Some fields like
> time stamp would need to be updated but they should be unmodified.
Not sure what you are trying to do, but this seems messy ;)
At rtx time, there is no guarantee that the master skb has not been
changed, so the content of TCP header might be wrong anyway.
next prev parent reply other threads:[~2017-11-01 17:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-01 17:27 SKB Reference Question Joe Smith
2017-11-01 17:33 ` Eric Dumazet [this message]
2017-11-01 19:22 ` Joe Smith
2017-11-01 19:44 ` Eric Dumazet
2017-11-02 5:35 ` David Miller
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