netdev - Re: [PATCH] net: forcedeth: convert to hw

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Date:	Fri, 15 Apr 2011 17:39:48 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net: forcedeth: convert to hw_features

On Fri, 2011-04-15 at 16:50 +0200, Michał Mirosław wrote:
> This also fixes a race around np->txrxctl_bits while changing RXCSUM offload.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
>  drivers/net/forcedeth.c |   78 +++++++++++++++-------------------------------
>  1 files changed, 26 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
> index d5ab4da..ec9a32d 100644
> --- a/drivers/net/forcedeth.c
> +++ b/drivers/net/forcedeth.c
> @@ -774,7 +774,6 @@ struct fe_priv {
>  	u32 driver_data;
>  	u32 device_id;
>  	u32 register_size;
> -	int rx_csum;
>  	u32 mac_in_use;
>  	int mgmt_version;
>  	int mgmt_sema;
> @@ -4480,58 +4479,36 @@ static int nv_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam*
>  	return 0;
>  }
>  
> -static u32 nv_get_rx_csum(struct net_device *dev)
> +static u32 nv_fix_features(struct net_device *dev, u32 features)
>  {
> -	struct fe_priv *np = netdev_priv(dev);
> -	return np->rx_csum != 0;
> +	/* vlan is dependent on rx checksum offload */
> +	if (features & (NETIF_F_HW_VLAN_TX|NETIF_F_HW_VLAN_RX))
> +		features |= NETIF_F_RXCSUM;
[...]

Shouldn't this be done the other way round:

	if (!(features & NETIF_F_RXCSUM))
		features &= ~(NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX);

So long as the VLAN feature flags are still set in wanted_features, they
will be turned back on automatically if RXCSUM is re-enabled.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
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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