netdev - Re: [PATCH v2 net 3/3] wireguard: send: account for mtu=0 devices

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Message-ID: <CAHmME9ok5ktHCvn0o1M-qjK68He-AsKJvKQMPkWnZL7Tq1GWVw@mail.gmail.com>
Date:   Fri, 14 Feb 2020 23:53:23 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net 3/3] wireguard: send: account for mtu=0 devices

On Fri, Feb 14, 2020 at 11:30 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
> Also note that UDP sockets have SOCK_RCU_FREE flag set, so core
> networking also respect one RCU grace period before freeing them.

       if (use_call_rcu)
               call_rcu(&sk->sk_rcu, __sk_destruct);
       else
               __sk_destruct(&sk->sk_rcu);

Ah, that's handy indeed.

> It is possible that no extra synchronize_{net|rcu}() call is needed,
> but this is left as an exercise for future kernels :)

Cool, yea, sounds like something I should play with for 5.7.

Sending v3 out in a few minutes.