linux-kernel - Re: [PATCH 5/6] Drivers: net: hyperv: Enable send side checksum offload

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Date:	Thu, 06 Mar 2014 15:48:42 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	kys@...rosoft.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Subject: Re: [PATCH 5/6] Drivers: net: hyperv: Enable send side checksum
 offload

From: KY Srinivasan <kys@...rosoft.com>
Date: Thu, 6 Mar 2014 20:29:13 +0000

> 
> 
>> -----Original Message-----
>> From: David Miller [mailto:davem@...emloft.net]
>> Sent: Friday, March 7, 2014 1:04 AM
>> To: KY Srinivasan
>> Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
>> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
>> jasowang@...hat.com
>> Subject: Re: [PATCH 5/6] Drivers: net: hyperv: Enable send side checksum
>> offload
>> 
>> From: "K. Y. Srinivasan" <kys@...rosoft.com>
>> Date: Thu,  6 Mar 2014 03:13:09 -0800
>> 
>> > +bool get_net_transport_info(struct sk_buff *skb, bool *is_v4,
>> > +				bool *is_tcp, bool *is_udp, u32 *trans_off) {
>> 
>> Returning so many values like this is awkward, at best.
>> 
>> Why not return a well defined bitmask:
>> 
>> #define TRANSPORT_INFO_SUCCESS	0x00000001
>> #define TRANSPORT_INFO_TCP	0x00000002
>> #define TRANSPORT_INFO_UDP	0x00000004
>> 
>> Then the only value you have to return by reference is trans_off.
> 
> I also need information on the IP version as well. If it is ok with you, I will use the return
> value to get information on the network protocol and return information on transport via
> reference - protocol and the offset.

Just add "TRANSPORT_INFO_IPv4" as another bitmask in the return value.
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