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Date: Tue, 10 Oct 2017 16:31:52 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: David Laight <David.Laight@...LAB.COM>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"jhs@...atatu.com" <jhs@...atatu.com>,
"xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
"saeedm@...lanox.com" <saeedm@...lanox.com>,
"matanb@...lanox.com" <matanb@...lanox.com>,
"leonro@...lanox.com" <leonro@...lanox.com>,
"mlxsw@...lanox.com" <mlxsw@...lanox.com>
Subject: Re: [patch net-next 2/4] net: sched: introduce per-egress action
device callbacks
Tue, Oct 10, 2017 at 03:31:59PM CEST, David.Laight@...LAB.COM wrote:
>From: Jiri Pirko
>> Sent: 10 October 2017 08:30
>> Introduce infrastructure that allows drivers to register callbacks that
>> are called whenever tc would offload inserted rule and specified device
>> acts as tc action egress device.
>
>How does a driver safely unregister a callback?
>(to avoid a race with the callback being called.)
>
>Usually this requires a callback in the context that makes the
>notification callbacks indicating that no more such callbacks
>will be made.
rtnl is your answer. It is being held during register/unregister/cb
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