netdev - Re: [PATCH net] inet: bring NLM_DONE out to a separate recv() in inet_dump

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Date: Mon, 3 Jun 2024 07:59:41 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: David Ahern <dsahern@...nel.org>, Stephen Hemminger
 <stephen@...workplumber.org>, davem@...emloft.net, netdev@...r.kernel.org,
 pabeni@...hat.com, Jaroslav Pulchart <jaroslav.pulchart@...ddata.com>
Subject: Re: [PATCH net] inet: bring NLM_DONE out to a separate recv() in
 inet_dump_ifaddr()

On Mon, 3 Jun 2024 16:22:19 +0200 Eric Dumazet wrote:
> > Hi Eric, how do you feel about this approach? It would also let us
> > extract the "RTNL unlocked dump" handling from af_netlink.c, which
> > would be nice.  
> 
> Sure, I have not thought of af_netlink
> 
> > BTW it will probably need to be paired with fixing the
> > for_each_netdev_dump() foot gun, maybe (untested):
> 
> I confess I am a bit lost : this part relates to your original submission,
> when you set "ctx->ifindex = ULONG_MAX;"  in inet_dump_ifaddr() ?

Yes, xa_for_each_start() leaves ifindex at the last valid entry, so
without this snippet it's not safe to call dump again after we reached
the end.