netdev - Re: [PATCH v3] net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)

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Date:	Wed, 21 Aug 2013 23:05:57 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Joe Perches <joe@...ches.com>
CC:	Arvid Brodin <arvid.brodin@...n.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Javier Boticario <jboticario@...il.com>,
	balferreira <balferreira@...glemail.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v3] net/hsr: Add support for the High-availability Seamless
 Redundancy protocol (HSRv0)

Hello.

On 08/21/2013 11:01 PM, Joe Perches wrote:

>> High-availability Seamless Redundancy ("HSR") provides instant failover
>> redundancy for Ethernet networks. It requires a special network topology where
>> all nodes are connected in a ring (each node having two physical network
>> interfaces). It is suited for applications that demand high availability and
>> very short reaction time.

> Hi Arvid.

> just trivia:

>> diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
> []
>> +static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
> []
>> +	if (likely(res1 == NET_XMIT_SUCCESS || res1 == NET_XMIT_CN ||
>> +		   res2 == NET_XMIT_SUCCESS || res2 == NET_XMIT_CN)) {

> This might be faster using | instead of ||

    Doesn't || use shortcut evaluation in C? I.e. if the 1st == evaluates to 
true, other comparisons are not even done.

WBR, Sergei

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