netdev - RE: [PATCH V3 1/6] net/ethtool: introduce a new ioctl for per queue setting

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Date:	Mon, 18 Jan 2016 02:25:10 +0000
From:	"Liang, Kan" <kan.liang@...el.com>
To:	Ben Hutchings <ben@...adent.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"bwh@...nel.org" <bwh@...nel.org>,
	"decot@...glers.com" <decot@...glers.com>
CC:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"f.fainelli@...il.com" <f.fainelli@...il.com>,
	"alexander.duyck@...il.com" <alexander.duyck@...il.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Nelson, Shannon" <shannon.nelson@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Williams, Mitch A" <mitch.a.williams@...el.com>,
	"ogerlitz@...lanox.com" <ogerlitz@...lanox.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"jiri@...lanox.com" <jiri@...lanox.com>,
	"sfeldma@...il.com" <sfeldma@...il.com>,
	"gospo@...ulusnetworks.com" <gospo@...ulusnetworks.com>,
	"sasha.levin@...cle.com" <sasha.levin@...cle.com>,
	"dsahern@...il.com" <dsahern@...il.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"cascardo@...hat.com" <cascardo@...hat.com>,
	"corbet@....net" <corbet@....net>
Subject: RE: [PATCH V3 1/6] net/ethtool: introduce a new ioctl for per queue
 setting

> 
> On Thu, 2016-01-14 at 09:08 -0500, kan.liang@...el.com wrote:
> [...]
> > --- a/include/uapi/linux/ethtool.h
> > +++ b/include/uapi/linux/ethtool.h
> > @@ -1144,6 +1144,21 @@ enum ethtool_sfeatures_retval_bits {
> >  #define ETHTOOL_F_WISH          (1 << ETHTOOL_F_WISH__BIT)
> >  #define ETHTOOL_F_COMPAT        (1 << ETHTOOL_F_COMPAT__BIT)
> >
> > +#define MAX_NUM_QUEUE		4096
> > +
> > +/**
> > + * struct ethtool_per_queue_op - apply sub command to the queues in
> mask.
> > + * @cmd: ETHTOOL_PERQUEUE
> > + * @sub_command: the sub command which apply to each queues
> > + * @queue_mask: Bitmap of the queues which sub command apply to
> > + * @data: A complete command structure following for each of the
> > +queues addressed  */ struct ethtool_per_queue_op {
> > +	__u32	cmd;
> > +	__u32	sub_command;
> > +	unsigned long
> queue_mask[BITS_TO_LONGS(MAX_NUM_QUEUE)];
> [...]
> 
> I thought we already agreed that this won't work for 32-bit userland on a
> big-endian 64-bit kernel?

I found David Decotigny's patch. https://lkml.org/lkml/2015/12/14/728
But it looks like it is not merged yet. 
Any idea when it will be merged to net-next or net?
So I can build my patch on top of his patch.

Thanks,
Kan

> 
> Ben.
> 
> --
> Ben Hutchings
> Theory and practice are closer in theory than in practice.
>                                 - John Levine, moderator of comp.compilers