netdev - [PATCH net-next 0/4] ipv6: remove addrconf reliance on loopback

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Date:   Thu, 10 Feb 2022 13:42:27 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 0/4] ipv6: remove addrconf reliance on loopback

From: Eric Dumazet <edumazet@...gle.com>

Second patch in this series removes IPv6 requirement about the netns
loopback device being the last device being dismantled.

This was needed because rt6_uncached_list_flush_dev()
and ip6_dst_ifdown() had to switch dst dev to a known
device (loopback).

Instead of loopback, we can use the (hidden) blackhole_netdev
which is also always there.

This will allow future simplfications of netdev_run_to()
and other parts of the stack like default_device_exit_batch().

Last two patches are optimizations for both IP families.

Eric Dumazet (4):
  ipv6: get rid of net->ipv6.rt6_stats->fib_rt_uncache
  ipv6: give an IPv6 dev to blackhole_netdev
  ipv6: add (struct uncached_list)->quarantine list
  ipv4: add (struct uncached_list)->quarantine list

 include/net/ip6_fib.h   |  3 +-
 net/ipv4/route.c        | 12 +++++--
 net/ipv6/addrconf.c     | 78 +++++++++++++++++------------------------
 net/ipv6/route.c        | 42 +++++++++++-----------
 net/ipv6/xfrm6_policy.c |  1 -
 5 files changed, 64 insertions(+), 72 deletions(-)

-- 
2.35.1.265.g69c8d7142f-goog