netdev - Re: [RFC PATCH net-next 2/2] net: Reset forwarded skb->tstamp before delivering to user space

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Message-ID: <CANn89iLXjnDZunHx04UUGQFLxWhq52HhdhcPiKiJW4mkLaLbOA@mail.gmail.com>
Date:   Wed, 8 Dec 2021 10:27:51 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Kernel-team@...com
Subject: Re: [RFC PATCH net-next 2/2] net: Reset forwarded skb->tstamp before
 delivering to user space

On Wed, Dec 8, 2021 at 12:30 AM Martin KaFai Lau <kafai@...com> wrote:

> For non bpf ingress, hmmm.... yeah, not sure if it is indeed an issue :/
> may be save the tx tstamp first and then temporarily restamp with __net_timestamp()

Martin, have you looked at time namespaces (CLONE_NEWTIME) ?

Perhaps we need to have more than one bit to describe time bases.