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.
