netdev - SKB Reference Question

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Message-ID: <CABGNecw9thLB4XOFdWRghj6E_uMrFroVko-Up6hodS75hmb4sg@mail.gmail.com>
Date:   Wed, 1 Nov 2017 10:27:49 -0700
From:   Joe Smith <codesoldier1@...il.com>
To:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: SKB Reference Question

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.

Regards,

-- 
JS