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/* vif.h
*
* This is the hypervisor end of the network code. The net_ring structure
* stored in each vif is placed on a shared page to interact with the guest VM.
*
* Copyright (c) 2002, A K Warfield and K A Fraser
*/
/* virtual network interface struct and associated defines. */
/* net_vif_st is the larger struct that describes a virtual network interface
* it contains a pointer to the net_ring_t structure that needs to be on a
* shared page between the hypervisor and guest. The vif struct is private
* to the hypervisor and is used primarily as a container to allow routing
* and interface administration. This define should eventually be moved to
* a non-shared interface file, as it is of no relevance to the guest.
*/
#include <hypervisor-ifs/network.h>
#include <xeno/skbuff.h>
/*
* shadow ring structures are used to protect the descriptors from
* tampering after they have been passed to the hypervisor.
*
* TX_RING_SIZE and RX_RING_SIZE are defined in the shared network.h.
*/
typedef struct rx_shadow_entry_st {
unsigned long addr;
unsigned short size;
unsigned short status;
unsigned long flush_count;
} rx_shadow_entry_t;
typedef struct tx_shadow_entry_st {
void *header;
unsigned long payload;
unsigned short size;
unsigned short status;
} tx_shadow_entry_t;
typedef struct net_shadow_ring_st {
rx_shadow_entry_t *rx_ring;
tx_shadow_entry_t *tx_ring;
/*
* Private copy of producer. Follows guest OS version, but never
* catches up with our consumer index.
*/
unsigned int rx_prod;
/* Points at next buffer to be filled by NIC. Chases rx_prod. */
unsigned int rx_idx;
/* Points at next buffer to be returned to the guest OS. Chases rx_idx. */
unsigned int rx_cons;
/*
* Private copy of producer. Follows guest OS version, but never
* catches up with our consumer index.
*/
unsigned int tx_prod;
/* Points at next buffer to be scheduled. Chases tx_prod. */
unsigned int tx_idx;
/* Points at next buffer to be returned to the guest OS. Chases tx_idx. */
unsigned int tx_cons;
} net_shadow_ring_t;
typedef struct net_vif_st {
net_ring_t *net_ring;
net_shadow_ring_t *shadow_ring;
int id;
struct task_struct *domain;
struct list_head list;
} net_vif_t;
/* VIF-related defines. */
#define MAX_GUEST_VIFS 2 // each VIF is a small overhead in task_struct
#define MAX_SYSTEM_VIFS 256
/* vif globals */
extern int sys_vif_count;
extern net_vif_t *sys_vif_list[];
/* vif prototypes */
net_vif_t *create_net_vif(int domain);
void destroy_net_vif(struct task_struct *p);
void add_default_net_rule(int vif_id, u32 ipaddr);
int __net_get_target_vif(u8 *data, unsigned int len, int src_vif);
void add_default_net_rule(int vif_id, u32 ipaddr);
#define net_get_target_vif(skb) __net_get_target_vif(skb->data, skb->len, skb->src_vif)
/* status fields per-descriptor:
*/
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