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tap: Abstract type of virtual interface from tap implementation

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macvlan object is re-structured to hold tap related elements in a separate
entity, tap_dev. Upon NETDEV_REGISTER device_event, tap_dev is registered with
idr and fetched again on tap_open. Few of the tap functions are modified to
accepted tap_dev as argument. tap_dev object includes callbacks to be used by
underlying virtual interface to take care of tx and rx accounting.

Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sainath Grandhi
2017-02-10 16:03:49 -08:00
committed by David S. Miller
parent ebc05ba7e8
commit 6fe3faf867
4 changed files with 229 additions and 165 deletions
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57
include/linux/if_tap.h
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@@ -14,11 +14,60 @@ static inline struct socket *tap_get_socket(struct file *f)
}
#endif /* CONFIG_MACVTAP */
#include <net/sock.h>
#include <linux/skb_array.h>
#define MAX_TAP_QUEUES 256
struct tap_queue;
struct tap_dev {
struct net_device *dev;
u16 flags;
/* This array tracks active taps. */
struct tap_queue __rcu *taps[MAX_TAP_QUEUES];
/* This list tracks all taps (both enabled and disabled) */
struct list_head queue_list;
int numvtaps;
int numqueues;
netdev_features_t tap_features;
int minor;
void (*update_features)(struct tap_dev *tap, netdev_features_t features);
void (*count_tx_dropped)(struct tap_dev *tap);
void (*count_rx_dropped)(struct tap_dev *tap);
};
/*
* A tap queue is the central object of tap module, it connects
* an open character device to virtual interface. There can be
* multiple queues on one interface, which map back to queues
* implemented in hardware on the underlying device.
*
* tap_proto is used to allocate queues through the sock allocation
* mechanism.
*
*/
struct tap_queue {
struct sock sk;
struct socket sock;
struct socket_wq wq;
int vnet_hdr_sz;
struct tap_dev __rcu *tap;
struct file *file;
unsigned int flags;
u16 queue_index;
bool enabled;
struct list_head next;
struct skb_array skb_array;
};
rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
void tap_del_queues(struct net_device *dev);
int tap_get_minor(struct macvlan_dev *vlan);
void tap_free_minor(struct macvlan_dev *vlan);
int tap_queue_resize(struct macvlan_dev *vlan);
void tap_del_queues(struct tap_dev *tap);
int tap_get_minor(struct tap_dev *tap);
void tap_free_minor(struct tap_dev *tap);
int tap_queue_resize(struct tap_dev *tap);
int tap_create_cdev(struct cdev *tap_cdev,
dev_t *tap_major, const char *device_name);
void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);