From: David Miller <davem@davemloft.net>
To: codesoldier1@gmail.com
Cc: netdev@vger.kernel.org, eric.dumazet@gmail.com
Subject: Re: SKB Reference Question
Date: Thu, 02 Nov 2017 14:35:57 +0900 (KST) [thread overview]
Message-ID: <20171102.143557.1541082339282323563.davem@davemloft.net> (raw)
In-Reply-To: <CABGNecw9thLB4XOFdWRghj6E_uMrFroVko-Up6hodS75hmb4sg@mail.gmail.com>
From: Joe Smith <codesoldier1@gmail.com>
Date: Wed, 1 Nov 2017 10:27:49 -0700
> 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.
Every time a data packet goes out, whether it is the initial transmission
or a retransmission, it goes through tcp_transmit_skb() which pushes the
TCP headers and fills in all of the TCP header options as well.
prev parent reply other threads:[~2017-11-02 5:36 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
2017-11-01 19:22 ` Joe Smith
2017-11-01 19:44 ` Eric Dumazet
2017-11-02 5:35 ` David Miller [this message]
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