netdev - Re: [PATCH v4 net-next] MPLS: Use mpls_features to activate software MPLS GSO segmentation

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Date:	Mon, 02 Jun 2014 20:42:02 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Jesse Gross <jesse@...ira.com>, Thomas Graf <tgraf@...g.ch>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>
Subject: Re: [PATCH v4 net-next] MPLS: Use mpls_features to activate
 software MPLS GSO segmentation

Hi Simon

On Tue, 2014-06-03 at 11:38 +0900, Simon Horman wrote:
> +/* If MPLS offload request, verify we are testing hardware MPLS features
> + * instead of standard features for the netdev.
> + */
> +#ifdef CONFIG_NET_MPLS_GSO
> +static netdev_features_t net_mpls_features(struct sk_buff *skb,
> +					   netdev_features_t features)
> +{
> +	int tmp;
> +	__be16 type;
> +
> +	type = skb_network_protocol(skb, &tmp);
> +	if (unlikely(type == cpu_to_be16(ETH_P_MPLS_UC) ||
> +		     type == cpu_to_be16(ETH_P_MPLS_MC)))

I believe net/core/dev.c prefers to use htons(ETH_P_MPLS_UC)

(check netif_skb_features())

> +		features &= skb->dev->mpls_features;
> +
> +	return features;
> +}
> +#else
> +static netdev_features_t net_mpls_features(struct sk_buff *skb,
> +					   netdev_features_t features)
> +{
> +	return features;
> +}
> +#endif
> +
>  static netdev_features_t harmonize_features(struct sk_buff *skb,
>  	netdev_features_t features)
>  {
>  	int tmp;

	_be16 type;

	type = skb_network_protocol(skb, &tmp);

>  
> +	features = net_mpls_features(skb, features);

	features = net_mpls_features(skb, features, type);

> +
>  	if (skb->ip_summed != CHECKSUM_NONE &&
>  	    !can_checksum_protocol(features, skb_network_protocol(skb, &tmp))) {

	!can_checksum_protocol(features, type)) {

>  		features &= ~NETIF_F_ALL_CSUM;



I guess CONFIG_NET_MPLS_GSO will be set by all distros, right ?



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