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

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Message-Id: <cover.1650580763.git.peilin.ye@bytedance.com>
Date:   Thu, 21 Apr 2022 15:43:42 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     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, Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net-next 0/2] Make [IP6]GRE[TAP] devices always NETIF_F_LLTX

From: Peilin Ye <peilin.ye@...edance.com>

Hi all,

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).

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!

[1] https://lore.kernel.org/netdev/cover.1650575919.git.peilin.ye@bytedance.com/

Thanks,
Peilin Ye (2):
  ip_gre: Make GRE and GRETAP devices always NETIF_F_LLTX
  ip6_gre: Make IP6GRE and IP6GRETAP devices always NETIF_F_LLTX

 net/ipv4/ip_gre.c  | 50 ++++++++++++++++++++--------------------------
 net/ipv6/ip6_gre.c | 34 ++++++++++++-------------------
 2 files changed, 35 insertions(+), 49 deletions(-)

-- 
2.20.1