netdev - Re: [PATCH 2/4 ethtool] ethtool: Support for configurable RSS hash key.

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Message-ID: <1390455756.3651.139.camel@deadeye.wl.decadent.org.uk>
Date:	Thu, 23 Jan 2014 05:42:36 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Venkata Duvvuru <VenkatKumar.Duvvuru@...lex.Com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/4 ethtool] ethtool: Support for configurable RSS hash
 key.

On Wed, 2014-01-22 at 12:06 +0000, Venkata Duvvuru wrote:
> > -----Original Message-----
> > From: Ben Hutchings [mailto:ben@...adent.org.uk]
> > Sent: Monday, January 20, 2014 7:13 PM
> > To: Venkata Duvvuru
> > Cc: netdev@...r.kernel.org
> > Subject: Re: [PATCH 2/4 ethtool] ethtool: Support for configurable RSS hash
> > key.
> > 
> > On Mon, 2014-01-20 at 13:28 +0000, Venkata Duvvuru wrote:
> > > Ben, Please ignore my previous reply. My reply options were screwed up in
> > that.
> > >
> > > > -----Original Message-----
> > > > From: Ben Hutchings [mailto:ben@...adent.org.uk]
> > > > Sent: Monday, January 20, 2014 12:06 AM
> > > > To: Venkata Duvvuru
> > > > Cc: netdev@...r.kernel.org
> > > > Subject: Re: [PATCH 2/4 ethtool] ethtool: Support for configurable
> > > > RSS hash key.
> > > >
> > > > On Fri, 2014-01-17 at 13:02 +0000, Venkata Duvvuru wrote:
> > > > > This ethtool patch will primarily implement the parser for the
> > > > > options
> > > > provided by the user for set and get hashkey before invoking the ioctl.
> > > > > This patch also has Ethtool man page changes which describes the
> > > > > Usage of
> > > > set and get hashkey options.
> > > >
> > > > I'd prefer to have this combined with the -x/-X options (and add new
> > > > long options to reflect that they cover the key as well).
> > >
> > > if we add hashkey options to the existing -x/-X (--show-rxfh-indir/ --set-
> > rxfh-indir), I think it won't be appropriate going by the command name.
> > > We could change the command name to something like --show-rssconfig /-
> > -rss-config but I'm afraid would that be backward compatible?
> > [...]
> > 
> > That's why I said 'add new long options'.  The ethtool argument parser allows
> > arbitrarily many aliases for each sub-command.
> 
> Just to make sure that we are in sync
>         { "-x|--show-rxfh-indir|--show-hashkey", 1, do_getrssconfig,
>           "Show RSS configuration" },
> 
>         { "-X|--set-rxfh-indir|--hashkey", 1, do_setrssconfig,
>           "Set RSS configuration",
>           "             equal N | weight W0 W1 ...\n"
>           "             hkey %x:%x:%x:%x:%x:....:%x\n" },
> 
> And equal/weight will be mutually exclusive with hkey.
> Does it makes sense?

No, you should be able to set both the key and the indirection table at
once.  And the new aliases should then be something like --set-rxfh and
--show-rxfh.

Ben.

-- 
Ben Hutchings
compatible: Gracefully accepts erroneous data from any source

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