linux-kernel - Re: [PATCH net-next 0/2] Make [IP6]GRE[TAP] devices always NETIF_F

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Date:   Mon, 25 Apr 2022 11:02:59 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Peilin Ye <peilin.ye@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] Make [IP6]GRE[TAP] devices always
 NETIF_F_LLTX

On Thu, 21 Apr 2022 15:43:42 -0700 Peilin Ye wrote:
> This patchset depends on these fixes [1].  Since o_seqno is now atomic_t,
> we can always turn on NETIF_F_LLTX for [IP6]GRE[TAP] devices, since we no
> longer need the TX lock (&txq->_xmit_lock).

LGTM, thanks, but please repost on Thu / Fri. The fixes make their way
into net-next on Thu so until then we can't apply.

> We could probably do the same thing to [IP6]ERSPAN devices as well, but
> I'm not familiar with them yet.  For example, ERSPAN devices are
> initialized as |= GRE_FEATURES in erspan_tunnel_init(), but I don't see
> IP6ERSPAN devices being initialized as |= GRE6_FEATURES.  Please suggest
> if I'm missing something, thanks!

Probably good to CC William when you repost.