Merge branch 'devices-always-netif_f_lltx'

Peilin Ye says:

====================
devices always NETIF_F_LLTX

v1: https://lore.kernel.org/netdev/[email protected]/

change since v1:
  - deleted "depends on patch..." in [1/2]'s commit message

This patchset depends on these fixes [1], which has been merged into
net-next.  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.  Where should we
initialize IP6ERSPAN devices' ->features?  Please suggest if I'm missing
something, thanks!

[1] https://lore.kernel.org/netdev/[email protected]/
====================

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

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