20d29d7a91
In order to use macvlan with qemu and other tools that require a tap file descriptor, the macvtap driver adds a small backend with a character device with the same interface as the tun driver, with a minimum set of features. Macvtap interfaces are created in the same way as macvlan interfaces using ip link, but the netif is just used as a handle for configuration and accounting, while the data goes through the chardev. Each macvtap interface has its own character device, simplifying permission management significantly over the generic tun/tap driver. Cc: Patrick McHardy <kaber@trash.net> Cc: Stephen Hemminger <shemminger@linux-foundation.org> Cc: David S. Miller" <davem@davemloft.net> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Or Gerlitz <ogerlitz@voltaire.com> Cc: netdev@vger.kernel.org Cc: bridge@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
78 lines
2 KiB
C
78 lines
2 KiB
C
#ifndef _LINUX_IF_MACVLAN_H
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#define _LINUX_IF_MACVLAN_H
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#include <linux/if_link.h>
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/netlink.h>
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#include <net/netlink.h>
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struct macvlan_port;
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struct macvtap_queue;
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/**
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* struct macvlan_rx_stats - MACVLAN percpu rx stats
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* @rx_packets: number of received packets
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* @rx_bytes: number of received bytes
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* @multicast: number of received multicast packets
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* @rx_errors: number of errors
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*/
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struct macvlan_rx_stats {
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unsigned long rx_packets;
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unsigned long rx_bytes;
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unsigned long multicast;
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unsigned long rx_errors;
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};
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struct macvlan_dev {
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struct net_device *dev;
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struct list_head list;
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struct hlist_node hlist;
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struct macvlan_port *port;
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struct net_device *lowerdev;
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struct macvlan_rx_stats *rx_stats;
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enum macvlan_mode mode;
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int (*receive)(struct sk_buff *skb);
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int (*forward)(struct net_device *dev, struct sk_buff *skb);
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struct macvtap_queue *tap;
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};
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static inline void macvlan_count_rx(const struct macvlan_dev *vlan,
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unsigned int len, bool success,
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bool multicast)
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{
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struct macvlan_rx_stats *rx_stats;
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rx_stats = per_cpu_ptr(vlan->rx_stats, smp_processor_id());
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if (likely(success)) {
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rx_stats->rx_packets++;;
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rx_stats->rx_bytes += len;
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if (multicast)
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rx_stats->multicast++;
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} else {
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rx_stats->rx_errors++;
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}
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}
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extern int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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int (*receive)(struct sk_buff *skb),
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int (*forward)(struct net_device *dev,
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struct sk_buff *skb));
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extern void macvlan_count_rx(const struct macvlan_dev *vlan,
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unsigned int len, bool success,
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bool multicast);
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extern void macvlan_dellink(struct net_device *dev, struct list_head *head);
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extern int macvlan_link_register(struct rtnl_link_ops *ops);
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extern netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
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struct net_device *dev);
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extern struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *);
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#endif /* _LINUX_IF_MACVLAN_H */
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