netdev - Re: [PATCH v2 net-next 4/7] ipv6: Plumb support for nexthop object in a fib6

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Message-ID: <453565b0-d08a-be96-3cd7-5608d4c21541@gmail.com>
Date:   Mon, 3 Jun 2019 19:36:06 -0600
From:   David Ahern <dsahern@...il.com>
To:     Martin Lau <kafai@...com>
Cc:     Wei Wang <weiwan@...gle.com>, David Ahern <dsahern@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "idosch@...lanox.com" <idosch@...lanox.com>,
        "saeedm@...lanox.com" <saeedm@...lanox.com>
Subject: Re: [PATCH v2 net-next 4/7] ipv6: Plumb support for nexthop object in
 a fib6_info

On 6/3/19 6:58 PM, Martin Lau wrote:
> I have concern on calling ip6_create_rt_rcu() in general which seems
> to trace back to this commit
> dec9b0e295f6 ("net/ipv6: Add rt6_info create function for ip6_pol_route_lookup")
> 
> This rt is not tracked in pcpu_rt, rt6_uncached_list or exception bucket.
> In particular, how to react to NETDEV_UNREGISTER/DOWN like
> the rt6_uncached_list_flush_dev() does and calls dev_put()?
> 
> The existing callers seem to do dst_release() immediately without
> caching it, but still concerning.

those are the callers that don't care about the dst_entry, but are
forced to deal with it. Removing the tie between fib lookups an
dst_entry is again the right solution.