netdev - Re: [PATCH net-next] bridge: Add ability to always enable TSO/UFO

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Date:	Wed, 10 Dec 2014 21:13:06 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	makita.toshiaki@....ntt.co.jp
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next] bridge: Add ability to always enable TSO/UFO

From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Date: Thu, 11 Dec 2014 11:04:44 +0900

> On 2014/12/11 4:50, David Miller wrote:
>> From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
>> Date: Wed, 10 Dec 2014 11:43:14 +0900
>> 
>>> -	features &= ~NETIF_F_ONE_FOR_ALL;
>>> +	features &= ~NETIF_F_ONE_FOR_ALL | NETIF_F_GSO_SOFTWARE;
>> 
>> I don't think this is the expression you intend to use.
> 
> Thank you, but this is really my intended expression.
> 
> "features &= ~NETIF_F_ONE_FOR_ALL" drops all of ONE_FOR_ALL bits
> including GSO_SOFTWARE.
> But I want to leave GSO_SOFTWARE bits here.

It is clearer to say this as:

	~(NETIF_F_ONE_FOR_ALL & ~NETIF_F_GSO_SOFTWARE)

Or create a new NETIF_F_* macro to express this idea succinctly.
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