netdev - RE: [RFC net-next PATCH 3/4] ethtool: Add new set commands

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Date:	Thu, 28 Jul 2011 08:51:05 -0700
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: RE: [RFC net-next PATCH 3/4] ethtool: Add new set commands

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Wednesday, July 27, 2011 10:28 PM
> To: Rose, Gregory V
> Cc: netdev@...r.kernel.org; bhutchings@...arflare.com; Kirsher, Jeffrey T
> Subject: Re: [RFC net-next PATCH 3/4] ethtool: Add new set commands
> 
> From: Greg Rose <gregory.v.rose@...el.com>
> Date: Wed, 27 Jul 2011 15:17:59 -0700
> 
> > Add new set commands to configure the number of SR-IOV VFs, the
> > number of VM queues and spoof checking on/off switch.
> >
> > Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> > ---
> >
> >  include/linux/ethtool.h |   11 ++++++++++-
> >  1 files changed, 10 insertions(+), 1 deletions(-)
> >
> > diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> > index c6e427a..c4972ba 100644
> > --- a/include/linux/ethtool.h
> > +++ b/include/linux/ethtool.h
> > @@ -36,12 +36,14 @@ struct ethtool_cmd {
> >  	__u8	mdio_support;
> >  	__u32	maxtxpkt;	/* Tx pkts before generating tx int */
> >  	__u32	maxrxpkt;	/* Rx pkts before generating rx int */
> > +	__u32	num_vfs;	/* Enable SR-IOV VFs */
> > +	__u32	num_vmqs;	/* Set number of queues for VMDq */
> 
> You can't change the layout of this datastructure in this way without
> breaking every ethtool binary out there.
> 
> You have to find another place to add these knobs.

Perhaps at the end of the ethtool_cmd structure?  Something like this:

/* This should work for both 32 and 64 bit userland. */
struct ethtool_cmd {
        __u32   cmd;
        __u32   supported;      /* Features this interface supports */
        __u32   advertising;    /* Features this interface advertises */
        __u16   speed;          /* The forced speed (lower bits) in
                                 * Mbps. Please use
                                 * ethtool_cmd_speed()/_set() to
                                 * access it */
        __u8    duplex;         /* Duplex, half or full */
        __u8    port;           /* Which connector port */
        __u8    phy_address;
        __u8    transceiver;    /* Which transceiver to use */
        __u8    autoneg;        /* Enable or disable autonegotiation */
        __u8    mdio_support;
        __u32   maxtxpkt;       /* Tx pkts before generating tx int */
        __u32   maxrxpkt;       /* Rx pkts before generating rx int */
        __u16   speed_hi;       /* The forced speed (upper
                                 * bits) in Mbps. Please use
                                 * ethtool_cmd_speed()/_set() to
                                 * access it */
        __u8    eth_tp_mdix;
        __u8    spoof_check;    /* Enable/Disable anti-spoofing */
        __u32   lp_advertising; /* Features the link partner advertises */
        __u32   reserved[2];
        __u32   num_vfs;        /* Enable SR-IOV VFs */
        __u32   num_vmqs;       /* Set number of queues for VMDq */
};

- Greg


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