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

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Message-ID: <5263d3ae-1865-d935-cb03-f6dfd4604d15@gmail.com>
Date:   Mon, 3 Jun 2019 16:35:49 -0600
From:   David Ahern <dsahern@...il.com>
To:     Wei Wang <weiwan@...gle.com>
Cc:     David Ahern <dsahern@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        idosch@...lanox.com, saeedm@...lanox.com,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH v2 net-next 4/7] ipv6: Plumb support for nexthop object in
 a fib6_info

On 6/3/19 3:58 PM, Wei Wang wrote:
> Hmm... I am still a bit concerned with the ip6_create_rt_rcu() call.
> If we have a blackholed nexthop, the lookup code here always tries to
> create an rt cache entry for every lookup.
> Maybe we could reuse the pcpu cache logic for this? So we only create
> new dst cache on the CPU if there is no cache created before.

I'll take a look.

Long term, I would like to see IPv6 separate FIB lookups from dst's -
like IPv4 does. In that case reject routes would not use a dst_entry;
rather the fib lookups return an error code.