netdev - Re: [PATCH net-next] skbuff: only inherit relevant tx

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Message-ID: <CACSApvY3taHwTV4RdPEnj4d8FU6FSt8kxqZiY=tB+pbxZRCCAA@mail.gmail.com>
Date:   Thu, 8 Jun 2017 11:59:40 -0400
From:   Soheil Hassas Yeganeh <soheil@...gle.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net-next] skbuff: only inherit relevant tx_flags

On Thu, Jun 8, 2017 at 11:35 AM, Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>
> From: Willem de Bruijn <willemb@...gle.com>
>
> When inheriting tx_flags from one skbuff to another, always apply a
> mask to avoid overwriting unrelated other bits in the field.
>
> The two SKBTX_SHARED_FRAG cases clears all other bits. In practice,
> tx_flags are zero at this point now. But this is fragile. Timestamp
> flags are set, for instance, if in tcp_gso_segment, after this clear
> in skb_segment.
>
> The SKBTX_ANY_TSTAMP mask in __skb_tstamp_tx ensures that new
> skbs do not accidentally inherit flags such as SKBTX_SHARED_FRAG.
>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>