netdev - Re: [PATCH 2/2 net-next] net: drivers: set TSO/UFO offload option explicitly

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Date:	Wed, 4 May 2011 14:36:39 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Shan Wei <shanwei@...fujitsu.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, rusty@...tcorp.com.au,
	mst@...hat.com, Eric Dumazet <eric.dumazet@...il.com>,
	mirq-linux@...e.qmqm.pl, bhutchings@...arflare.com, dm@...lsio.com
Subject: Re: [PATCH 2/2 net-next] net: drivers: set TSO/UFO offload option explicitly

2011/4/29 Shan Wei <shanwei@...fujitsu.com>:
> The device drivers should not use NETIF_F_ALL_TSO mask to set hw_features(or features),
> but have to explicitly set offload option. Because, This would make drivers automatically
> clain to support any new TSO feature an the moment of NETIF_F_ALL_TSO is expanded.
>
> Some code style tuning. Just compile test.
>
> Signed-off-by: Shan Wei <shanwei@...fujitsu.com>
> ---
>  drivers/net/loopback.c   |   18 ++++++++----------
>  drivers/net/virtio_net.c |    9 ++++++---
>  2 files changed, 14 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
> index d70fb76..bfb6a4a 100644
> --- a/drivers/net/loopback.c
> +++ b/drivers/net/loopback.c
> @@ -152,6 +152,9 @@ static const struct net_device_ops loopback_ops = {
>        .ndo_get_stats64 = loopback_get_stats64,
>  };
>
> +#define LOOPBACK_USER_FEATURES (NETIF_F_TSO | NETIF_F_TSO_ECN | \
> +                               NETIF_F_TSO6 | NETIF_F_UFO)
> +
>  /*
>  * The loopback device is special. There is only one instance
>  * per network namespace.
> @@ -165,16 +168,11 @@ static void loopback_setup(struct net_device *dev)
>        dev->type               = ARPHRD_LOOPBACK;      /* 0x0001*/
>        dev->flags              = IFF_LOOPBACK;
>        dev->priv_flags        &= ~IFF_XMIT_DST_RELEASE;
> -       dev->hw_features        = NETIF_F_ALL_TSO | NETIF_F_UFO;
> -       dev->features           = NETIF_F_SG | NETIF_F_FRAGLIST
> -               | NETIF_F_ALL_TSO
> -               | NETIF_F_UFO
> -               | NETIF_F_NO_CSUM
> -               | NETIF_F_RXCSUM
> -               | NETIF_F_HIGHDMA
> -               | NETIF_F_LLTX
> -               | NETIF_F_NETNS_LOCAL
> -               | NETIF_F_VLAN_CHALLENGED;
> +       dev->hw_features        = LOOPBACK_USER_FEATURES;
> +       dev->features           = NETIF_F_SG | NETIF_F_FRAGLIST
> +               | LOOPBACK_USER_FEATURES | NETIF_F_NO_CSUM | NETIF_F_RXCSUM
> +               | NETIF_F_HIGHDMA | NETIF_F_LLTX
> +               | NETIF_F_NETNS_LOCAL | NETIF_F_VLAN_CHALLENGED;
>        dev->ethtool_ops        = &loopback_ethtool_ops;
>        dev->header_ops         = &eth_header_ops;
>        dev->netdev_ops         = &loopback_ops;

You can add NETIF_F_HIGHDMA and NETIF_F_NO_CSUM to
LOOPBACK_USER_FEATURES in one go. NETIF_F_RXCSUM could match
NETIF_F_NO_CSUM state (this needs ndo_fix_features callback), but this
won't have much real functional impact.

Best Regards,
Michał Mirosław
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