netdev - Re: [PATCH net-next v4 4/5] xen-netback: handle IPv6 TCP GSO packets from the guest

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Date:	Wed, 16 Oct 2013 17:15:13 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Paul Durrant <paul.durrant@...rix.com>
CC:	<xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>,
	Wei Liu <wei.liu2@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH net-next v4 4/5] xen-netback: handle IPv6 TCP GSO
 packets from the guest

On Fri, 2013-10-11 at 16:06 +0100, Paul Durrant wrote:
> This patch adds a xenstore feature flag, festure-gso-tcpv6, to advertise
> that netback can handle IPv6 TCP GSO packets. It creates SKB_GSO_TCPV6 skbs
> if the frontend passes an extra segment with the new type
> XEN_NETIF_GSO_TYPE_TCPV6 added to netif.h.
> 
> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>

This patch looks fine but should it not be after the following patch
which actually causes the necessary pull ups to happen?

> Cc: Wei Liu <wei.liu2@...rix.com>
> Cc: David Vrabel <david.vrabel@...rix.com>
> Cc: Ian Campbell <ian.campbell@...rix.com>
> ---
>  drivers/net/xen-netback/netback.c |   11 ++++++++---
>  drivers/net/xen-netback/xenbus.c  |    7 +++++++
>  include/xen/interface/io/netif.h  |   10 +++++++++-
>  3 files changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
> index 74c13b9..65f04e7 100644
> --- a/drivers/net/xen-netback/netback.c
> +++ b/drivers/net/xen-netback/netback.c
> @@ -1096,15 +1096,20 @@ static int xenvif_set_skb_gso(struct xenvif *vif,
>  		return -EINVAL;
>  	}
>  
> -	/* Currently only TCPv4 S.O. is supported. */
> -	if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) {
> +	switch (gso->u.gso.type) {
> +	case XEN_NETIF_GSO_TYPE_TCPV4:
> +		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
> +		break;
> +	case XEN_NETIF_GSO_TYPE_TCPV6:
> +		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
> +		break;
> +	default:
>  		netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type);
>  		xenvif_fatal_tx_err(vif);
>  		return -EINVAL;
>  	}
>  
>  	skb_shinfo(skb)->gso_size = gso->u.gso.size;
> -	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
>  
>  	/* Header must be checked, and gso_segs computed. */
>  	skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
> diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
> index 9c9b37d..7e4dcc9 100644
> --- a/drivers/net/xen-netback/xenbus.c
> +++ b/drivers/net/xen-netback/xenbus.c
> @@ -105,6 +105,13 @@ static int netback_probe(struct xenbus_device *dev,
>  			goto abort_transaction;
>  		}
>  
> +		err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6",
> +				    "%d", sg);
> +		if (err) {
> +			message = "writing feature-gso-tcpv6";
> +			goto abort_transaction;
> +		}
> +
>  		/* We support partial checksum setup for IPv6 packets */
>  		err = xenbus_printf(xbt, dev->nodename,
>  				    "feature-ipv6-csum-offload",
> diff --git a/include/xen/interface/io/netif.h b/include/xen/interface/io/netif.h
> index d9fb44739..d7dd8d7 100644
> --- a/include/xen/interface/io/netif.h
> +++ b/include/xen/interface/io/netif.h
> @@ -61,6 +61,13 @@
>   */
>  
>  /*
> + * "feature-gso-tcpv4" and "feature-gso-tcpv6" advertise the capability to
> + * handle large TCP packets (in IPv4 or IPv6 form respectively). Neither
> + * frontends nor backends are assumed to be capable unless the flags are
> + * present.
> + */
> +
> +/*
>   * This is the 'wire' format for packets:
>   *  Request 1: xen_netif_tx_request  -- XEN_NETTXF_* (any flags)
>   * [Request 2: xen_netif_extra_info]    (only if request 1 has XEN_NETTXF_extra_info)
> @@ -105,8 +112,9 @@ struct xen_netif_tx_request {
>  #define _XEN_NETIF_EXTRA_FLAG_MORE	(0)
>  #define  XEN_NETIF_EXTRA_FLAG_MORE	(1U<<_XEN_NETIF_EXTRA_FLAG_MORE)
>  
> -/* GSO types - only TCPv4 currently supported. */
> +/* GSO types */
>  #define XEN_NETIF_GSO_TYPE_TCPV4	(1)
> +#define XEN_NETIF_GSO_TYPE_TCPV6	(2)
>  
>  /*
>   * This structure needs to fit within both netif_tx_request and


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