netdev - Re: [Patch net v2] net/ipv6: do not copy dst flags on rt init

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Message-Id: <20180917.194337.206158871668725470.davem@davemloft.net>
Date:   Mon, 17 Sep 2018 19:43:37 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     posk@...gle.com
Cc:     netdev@...r.kernel.org, dsahern@...il.com
Subject: Re: [Patch net v2] net/ipv6: do not copy dst flags on rt init

From: Peter Oskolkov <posk@...gle.com>
Date: Mon, 17 Sep 2018 10:20:53 -0700

> DST_NOCOUNT in dst_entry::flags tracks whether the entry counts
> toward route cache size (net->ipv6.sysctl.ip6_rt_max_size).
> 
> If the flag is NOT set, dst_ops::pcpuc_entries counter is incremented
> in dist_init() and decremented in dst_destroy().
> 
> This flag is tied to allocation/deallocation of dst_entry and
> should not be copied from another dst/route. Otherwise it can happen
> that dst_ops::pcpuc_entries counter grows until no new routes can
> be allocated because the counter reached ip6_rt_max_size due to
> DST_NOCOUNT not set and thus no counter decrements on gc-ed routes.
> 
> Fixes: 3b6761d18bc1 ("net/ipv6: Move dst flags to booleans in fib entries")
> Cc: David Ahern <dsahern@...il.com>
> Acked-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Peter Oskolkov <posk@...gle.com>

Applied and queued up for -stable, thank you.