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Date:	Mon, 9 May 2011 09:36:35 +0200
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com,
	Mahesh Bandewar <maheshb@...gle.com>
Subject: Re: [PATCH net-next-2.6] sfc: Implement NETIF_F_LOOPBACK

On Fri, May 06, 2011 at 01:12:31AM +0100, Ben Hutchings wrote:
> We already have comprehensive support for loopback testing, so pick
> the nearest mode and run with it.
> 
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> ---
> David, this depends on Mahesh's patch to define NETIF_F_LOOPBACK
> <http://patchwork.ozlabs.org/patch/94190/>.  Although you've marked that
> as RFC, I think it is ready to apply.
> 
> Ben.
> 
>  drivers/net/sfc/efx.c |   24 ++++++++++++++++++++++--
>  1 files changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
> index 38a55e9..b7bfb49 100644
> --- a/drivers/net/sfc/efx.c
> +++ b/drivers/net/sfc/efx.c
> @@ -1884,6 +1884,25 @@ static int efx_set_features(struct net_device *net_dev, u32 data)
>  	if (net_dev->features & ~data & NETIF_F_NTUPLE)
>  		efx_filter_clear_rx(efx, EFX_FILTER_PRI_MANUAL);
>  
> +	/* Toggle loopback if required */
> +	if ((net_dev->features ^ data) & NETIF_F_LOOPBACK) {
> +		enum efx_loopback_mode old_mode;
> +		int rc;
> +
> +		mutex_lock(&efx->mac_lock);
> +		old_mode = efx->loopback_mode;
> +		if (data & NETIF_F_LOOPBACK)
> +			efx->loopback_mode = __ffs(efx->loopback_modes);
> +		else
> +			efx->loopback_mode = LOOPBACK_NONE;
> +		rc = __efx_reconfigure_port(efx);
> +		if (rc)
> +			efx->loopback_mode = old_mode;
> +		mutex_unlock(&efx->mac_lock);
> +		if (rc)
> +			return rc;
> +	}
> +
>  	return 0;
>  }

If other features than NETIF_F_LOOPBACK were changed correctly, this should
update dev->features of what changed before error return. If not, device's
state will diverge to what is in dev->features.

> @@ -2472,8 +2491,9 @@ static int __devinit efx_pci_probe(struct pci_dev *pci_dev,
>  	net_dev->vlan_features |= (NETIF_F_ALL_CSUM | NETIF_F_SG |
>  				   NETIF_F_HIGHDMA | NETIF_F_ALL_TSO |
>  				   NETIF_F_RXCSUM);
> -	/* All offloads can be toggled */
> -	net_dev->hw_features = net_dev->features & ~NETIF_F_HIGHDMA;
> +	/* All offloads can be toggled, and so can loopback */
> +	net_dev->hw_features = ((net_dev->features & ~NETIF_F_HIGHDMA) |
> +				NETIF_F_LOOPBACK);
>  	efx = netdev_priv(net_dev);
>  	pci_set_drvdata(pci_dev, efx);
>  	SET_NETDEV_DEV(net_dev, &pci_dev->dev);

You can remove the '& ~NETIF_F_HIGHDMA' part, as it's now allowed to be
changed (commit fa2bd7ff9247f4218dfc907db14d000cd7edd862).

Best Regards,
Michał Mirosław
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