netdev - Re: [PATCH v3 net-next 10/12] net: bonding: ensure .ndo_get

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Date:   Fri, 8 Jan 2021 10:14:01 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        George McCollister <george.mccollister@...il.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Arnd Bergmann <arnd@...db.de>, Taehee Yoo <ap420073@...il.com>,
        Jiri Pirko <jiri@...lanox.com>, Florian Westphal <fw@...len.de>
Subject: Re: [PATCH v3 net-next 10/12] net: bonding: ensure .ndo_get_stats64
 can sleep

On Fri, Jan 8, 2021 at 4:59 AM Saeed Mahameed <saeed@...nel.org> wrote:
>
> Eric, about two years ago you were totally against sleeping in
> ndo_get_stats, what happened ? :)
> https://lore.kernel.org/netdev/4cc44e85-cb5e-502c-30f3-c6ea564fe9ac@gmail.com/
>
> My approach to solve this was much simpler and didn't require  a new
> mutex nor RTNL lock, all i did is to reduce the rcu critical section to
> not include the call to the driver by simply holding the netdev via
> dev_hold()
>

Yeah, and how have you dealt with bonding at that time ?

Look, it seems to me Vladimir's work is more polished.

If you disagree, repost a rebased patch series so that we can
test/compare and choose the best solution.

And make sure to test it with LOCKDEP enabled ;)

Thanks.