linux-kernel - Re: [PATCH] net: mvneta: fix changing MTU when using per-cpu processing

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Date:	Fri, 01 Apr 2016 15:18:20 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mw@...ihalf.com
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org, linux@....linux.org.uk,
	sebastian.hesselbarth@...il.com, andrew@...n.ch,
	jason@...edaemon.net, thomas.petazzoni@...e-electrons.com,
	gregory.clement@...e-electrons.com, nadavh@...vell.com,
	alior@...vell.com, nitroshift@...oo.com, jaz@...ihalf.com
Subject: Re: [PATCH] net: mvneta: fix changing MTU when using per-cpu
 processing

From: Marcin Wojtas <mw@...ihalf.com>
Date: Fri,  1 Apr 2016 15:21:18 +0200

> After enabling per-cpu processing it appeared that under heavy load
> changing MTU can result in blocking all port's interrupts and transmitting
> data is not possible after the change.
> 
> This commit fixes above issue by disabling percpu interrupts for the
> time, when TXQs and RXQs are reconfigured.
> 
> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>

Applied, thanks.

When I reviewed this I was worried that this was yet another case where
the ndo op could be invoked in a potentially atomic or similar context,
whereby on_each_cpu() would be illegal to use.

But that appears to not be the case, and thus this change is just fine.

Thanks.