netdev - Re: [PATCH v2 net-next-2.6] ifb: add performance flags

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Date:	Mon, 3 Jan 2011 20:37:03 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, xiaosuo@...il.com,
	pstaszewski@...are.pl, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next-2.6] ifb: add performance flags

On Sun, Jan 02, 2011 at 09:24:36PM +0100, Eric Dumazet wrote:
> Le mercredi 29 décembre 2010 ?? 00:07 +0100, Jarek Poplawski a écrit :
> 
> > Ingress is before vlans handler so these features and the
> > NETIF_F_HW_VLAN_TX flag seem useful for ifb considering
> > dev_hard_start_xmit() checks.
> 
> OK, here is v2 of the patch then, thanks everybody.
> 
> 
> [PATCH v2 net-next-2.6] ifb: add performance flags
> 
> IFB can use the full set of features flags (NETIF_F_SG |
> NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
> avoid unnecessary split of some packets (GRO for example)
> 
> Changli suggested to also set vlan_features,

He also suggested more GSO flags of which especially NETIF_F_TSO6
seems interesting (wrt GRO)?

Jarek P.

> Jarek suggested to add NETIF_F_HW_VLAN_TX as well.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Changli Gao <xiaosuo@...il.com>
> Cc: Jarek Poplawski <jarkao2@...il.com>
> Cc: Pawel Staszewski <pstaszewski@...are.pl>
> ---
>  drivers/net/ifb.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
> index 124dac4..66ca7bf 100644
> --- a/drivers/net/ifb.c
> +++ b/drivers/net/ifb.c
> @@ -126,6 +126,9 @@ static const struct net_device_ops ifb_netdev_ops = {
>  	.ndo_validate_addr = eth_validate_addr,
>  };
>  
> +#define IFB_FEATURES (NETIF_F_NO_CSUM | NETIF_F_SG  | NETIF_F_FRAGLIST | \
> +		      NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_HW_VLAN_TX)
> +
>  static void ifb_setup(struct net_device *dev)
>  {
>  	/* Initialize the device structure. */
> @@ -136,6 +139,9 @@ static void ifb_setup(struct net_device *dev)
>  	ether_setup(dev);
>  	dev->tx_queue_len = TX_Q_LIMIT;
>  
> +	dev->features |= IFB_FEATURES;
> +	dev->vlan_features |= IFB_FEATURES;
> +
>  	dev->flags |= IFF_NOARP;
>  	dev->flags &= ~IFF_MULTICAST;
>  	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
> 
> 
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