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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: dev@dpdk.org, jigsaw <jigsaw@gmail.com>
Subject: Re: [dpdk-dev] [PATCH] Add user defined tag calculation callback to librte_distributor.
Date: Thu, 06 Nov 2014 11:36:09 +0100	[thread overview]
Message-ID: <9190772.1rnKUO3oNV@xps13> (raw)
In-Reply-To: <20141106092228.GA3056@bricha3-MOBL3>

2014-11-06 09:22, Bruce Richardson:
> On Wed, Nov 05, 2014 at 07:24:13PM +0200, jigsaw wrote:
> > http://dpdk.org/browse/dpdk/tree/lib/librte_distributor/rte_distributor.c#n285
> > 
> >         new_tag = (next_mb->hash.rss | 1);
> > 
> > Why the logical OR is needed?
> 
> That's needed to ensure that we never track a tag with an actual value of zero.
> We instead always force the low bit to be 1, so that we can use zero as an
> "empty" value.

Bruce, could you check how this code may be better commented please?
This discussion shows that the distributor library probably needs more
explanations in the code or doxygen.

Thanks
-- 
Thomas

  parent reply	other threads:[~2014-11-06 10:27 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-05 13:30 Qinglai Xiao
2014-11-05 14:27 ` Bruce Richardson
2014-11-05 15:11   ` jigsaw
2014-11-05 16:36     ` Bruce Richardson
2014-11-05 17:24       ` jigsaw
2014-11-06  9:22         ` Bruce Richardson
2014-11-06 10:14           ` jigsaw
2014-11-06 10:36           ` Thomas Monjalon [this message]
2014-11-06 12:36             ` [dpdk-dev] 答复: [PATCH] Add user defined tag calculation callback tolibrte_distributor Qinglai Xiao
2014-11-06 13:59               ` Bruce Richardson
2014-11-06 18:01                 ` jigsaw
2014-11-06 19:52                   ` jigsaw
2014-11-07  9:45                     ` Bruce Richardson
2014-11-07 12:38                       ` jigsaw
2014-11-07 13:53                         ` Bruce Richardson
2014-11-07 14:31                           ` jigsaw
     [not found]                             ` <20141107144410.GC12092@bricha3-MOBL3>
2014-11-07 14:52                               ` jigsaw
2014-11-07 15:04                                 ` Bruce Richardson
2014-11-07 15:18                                   ` jigsaw
2014-11-06 13:55             ` [dpdk-dev] [PATCH] distributor: add comments to make code more readable Bruce Richardson
2014-11-07 14:08               ` Thomas Monjalon
2014-11-07 14:31                 ` jigsaw
2014-11-06 13:57             ` [dpdk-dev] [PATCH] Add user defined tag calculation callback to librte_distributor Bruce Richardson
2014-11-05 15:13   ` Ananyev, Konstantin
2014-11-05 15:24     ` jigsaw

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