netdev - Re: [RFC net-next 2/6] net: Preparation for vrf device

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Date:	Wed, 08 Jul 2015 10:37:10 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	David Ahern <dsa@...ulusnetworks.com>, netdev@...r.kernel.org
CC:	shm@...ulusnetworks.com, roopa@...ulusnetworks.com,
	gospo@...ulusnetworks.com, jtoppins@...ulusnetworks.com,
	nikolay@...ulusnetworks.com, ddutt@...ulusnetworks.com,
	hannes@...essinduktion.org, stephen@...workplumber.org,
	hadi@...atatu.com, ebiederm@...ssion.com, davem@...emloft.net
Subject: Re: [RFC net-next 2/6] net: Preparation for vrf device

Le 06/07/2015 17:03, David Ahern a écrit :
> Add a VRF_MASTER flag for interfaces and helper functions for determining
> if a device is a VRF_MASTER.
>
> Also, add link attribute for passing VRF_TABLE id.
>
> Both are used in the following patch that adds a VRF device driver.
>
> Signed-off-by: Shrijeet Mukherjee <shm@...ulusnetworks.com>
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
> ---
>   include/linux/netdevice.h    | 21 +++++++++++++++++++++
>   include/uapi/linux/if_link.h |  9 +++++++++
>   2 files changed, 30 insertions(+)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index e20979dfd6a9..142cb64f139c 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1274,6 +1274,7 @@ enum netdev_priv_flags {
>   	IFF_XMIT_DST_RELEASE_PERM	= 1<<22,
>   	IFF_IPVLAN_MASTER		= 1<<23,
>   	IFF_IPVLAN_SLAVE		= 1<<24,
> +	IFF_VRF_MASTER		        = 1<<25,
nit: use tab instead space here  ^^^^^^^

Also, why calling this '_MASTER', is there a notion of SLAVE?

>   };
>
>   #define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
> @@ -1301,6 +1302,7 @@ enum netdev_priv_flags {
>   #define IFF_XMIT_DST_RELEASE_PERM	IFF_XMIT_DST_RELEASE_PERM
>   #define IFF_IPVLAN_MASTER		IFF_IPVLAN_MASTER
>   #define IFF_IPVLAN_SLAVE		IFF_IPVLAN_SLAVE
> +#define IFF_VRF_MASTER		        IFF_VRF_MASTER
nit: use tab instead space here          ^^^^^^^

>
>   /**
>    *	struct net_device - The DEVICE structure.
> @@ -1417,6 +1419,7 @@ enum netdev_priv_flags {
>    *	@dn_ptr:	DECnet specific data
>    *	@ip6_ptr:	IPv6 specific data
>    *	@ax25_ptr:	AX.25 specific data
> + *	@vrf_ptr:	VRF specific data
>    *	@ieee80211_ptr:	IEEE 802.11 specific data, assign before registering
>    *
>    *	@last_rx:	Time of last Rx
> @@ -1629,6 +1632,7 @@ struct net_device {
>   	struct dn_dev __rcu     *dn_ptr;
>   	struct inet6_dev __rcu	*ip6_ptr;
>   	void			*ax25_ptr;
> +	struct net_vrf_dev      *vrf_ptr;
nit: use tab here         ^^^^^^

>   	struct wireless_dev	*ieee80211_ptr;
>   	struct wpan_dev		*ieee802154_ptr;
>   #if IS_ENABLED(CONFIG_MPLS_ROUTING)
> @@ -3781,6 +3785,23 @@ static inline bool netif_supports_nofcs(struct net_device *dev)
>   	return dev->priv_flags & IFF_SUPP_NOFCS;
>   }
>
> +static inline bool netif_is_vrf(struct net_device *dev)
> +{
> +	return dev->priv_flags & IFF_VRF_MASTER;
> +}
> +
> +static inline bool netif_idx_is_vrf(struct net *net, int idx)
Usally, the index of an interface is named 'ifindex', it eases code reading
to keep the same name. Something like:
netif_index_is_vrf(struct net *net, int ifindex)

> +{
> +	struct net_device *dev = dev_get_by_index(net, idx);
> +	bool rc = false;
> +
> +	if (dev) {
> +		rc = netif_is_vrf(dev);
> +		dev_put(dev);
> +	}
> +	return rc;
> +}
> +
[snip]
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