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

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Message-ID: <20220211155739.66f5483b@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 11 Feb 2022 15:57:39 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Mahesh Bandewar <maheshb@...gle.com>
Subject: Re: [PATCH net-next 0/4] ipv6: remove addrconf reliance on loopback

On Thu, 10 Feb 2022 13:42:27 -0800 Eric Dumazet wrote:
> Second patch in this series removes IPv6 requirement about the netns
> loopback device being the last device being dismantled.

Great!

> 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()

Should I take a stab at it, or is it on your todo list, anyway?

> and other parts of the stack like default_device_exit_batch().
> 
> Last two patches are optimizations for both IP families.