netdev - Re: (Lack of) specification for RX n-tuple filtering

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Date:	Wed, 08 Dec 2010 19:39:06 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Vladislav Zolotarov <vladz@...adcom.com>
Cc:	Dimitris Michailidis <dm@...lsio.com>,
	Peter Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: (Lack of) specification for RX n-tuple filtering

On Wed, 2010-12-08 at 19:14 +0000, Ben Hutchings wrote:
> On Wed, 2010-12-08 at 21:10 +0200, Vladislav Zolotarov wrote:
> > > The implementation of the -U
> > > option could potentially be made to fallback to ETHTOOL_SRXCLSRLINS if
> > > vlan_tag and user_def are not specified.
> > > 
> > 
> > Having said that, don't u think that it could be more user friendly to
> > extend the ETHTOOL_SRXCLSRLINS interface to handle the lan_tag and
> > user_def and drop the n-tuple interface at all?
> 
> No, we can't remove userland interfaces.

Having said that, this particular interface is fairly broken...

$ cat test.c
#include <stddef.h>
#include <stdio.h>

#include <linux/ethtool.h>

int main(void)
{
    printf("%zd\n", offsetof(struct ethtool_rx_flow_spec, ring_cookie));
    return 0;
}
$ cc -m64 -Wall test.c
$ ./a.out 
152
$ cc -m32 -Wall test.c
$ ./a.out 
148

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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