netdev - Re: [Patch net] ipv4: restore rt->fi for reference counting

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Message-ID: <CAM_iQpU-+8rVswnfMcOtQ8Lb0PrnGJEwm2MjQWMLEZdEycSZmg@mail.gmail.com>
Date:   Fri, 12 May 2017 14:13:03 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Julian Anastasov <ja@....bg>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [Patch net] ipv4: restore rt->fi for reference counting

On Fri, May 12, 2017 at 1:58 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Fri, May 12, 2017 at 10:27 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> Or maybe don't touch nh_oif but using a new flag in
>> nh_flags?? We only need to know if we should call
>> dev_put() in free_fib_info_rcu().
>>
>> Again, I am still not sure if it is any better than just
>> putting these fib_nh into a linked list.
>>
>
> I am afraid we have to use a linked list, because either a flag or
> nh_oif is per nh, but one nh could have multiple different nh_devs...

Scratch that. Each fib_nh has one nh_dev...
I am trying to use a flag.