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/******************************************************************************
* netif.h
*
* Unified network-device I/O interface for Xen guest OSes.
*
* Copyright (c) 2003-2004, Keir Fraser
*/
#ifndef __XEN_PUBLIC_IO_NETIF_H__
#define __XEN_PUBLIC_IO_NETIF_H__
typedef struct {
memory_t addr; /* 0: Machine address of packet. */
MEMORY_PADDING;
u16 id; /* 8: Echoed in response message. */
u16 size; /* 10: Packet size in bytes. */
} PACKED netif_tx_request_t; /* 12 bytes */
typedef struct {
u16 id; /* 0 */
s8 status; /* 2 */
u8 __pad; /* 3 */
} PACKED netif_tx_response_t; /* 4 bytes */
typedef struct {
u16 id; /* 0: Echoed in response message. */
} PACKED netif_rx_request_t; /* 2 bytes */
typedef struct {
memory_t addr; /* 0: Machine address of packet. */
MEMORY_PADDING;
u16 id; /* 8: */
s16 status; /* 10: -ve: BLKIF_RSP_* ; +ve: Rx'ed pkt size. */
} PACKED netif_rx_response_t; /* 12 bytes */
/*
* We use a special capitalised type name because it is _essential_ that all
* arithmetic on indexes is done on an integer type of the correct size.
*/
typedef u32 NETIF_RING_IDX;
/*
* Ring indexes are 'free running'. That is, they are not stored modulo the
* size of the ring buffer. The following macros convert a free-running counter
* into a value that can directly index a ring-buffer array.
*/
#define MASK_NETIF_RX_IDX(_i) ((_i)&(NETIF_RX_RING_SIZE-1))
#define MASK_NETIF_TX_IDX(_i) ((_i)&(NETIF_TX_RING_SIZE-1))
#define NETIF_TX_RING_SIZE 256
#define NETIF_RX_RING_SIZE 256
/* This structure must fit in a memory page. */
typedef struct {
/*
* Frontend places packets into ring at tx_req_prod.
* Frontend receives event when tx_resp_prod passes tx_event.
* 'req_cons' is a shadow of the backend's request consumer -- the frontend
* may use it to determine if all queued packets have been seen by the
* backend.
*/
NETIF_RING_IDX req_prod; /* 0 */
NETIF_RING_IDX req_cons; /* 4 */
NETIF_RING_IDX resp_prod; /* 8 */
NETIF_RING_IDX event; /* 12 */
union { /* 16 */
netif_tx_request_t req;
netif_tx_response_t resp;
} PACKED ring[NETIF_TX_RING_SIZE];
} PACKED netif_tx_interface_t;
/* This structure must fit in a memory page. */
typedef struct {
/*
* Frontend places empty buffers into ring at rx_req_prod.
* Frontend receives event when rx_resp_prod passes rx_event.
*/
NETIF_RING_IDX req_prod; /* 0 */
NETIF_RING_IDX resp_prod; /* 4 */
NETIF_RING_IDX event; /* 8 */
union { /* 12 */
netif_rx_request_t req;
netif_rx_response_t resp;
} PACKED ring[NETIF_RX_RING_SIZE];
} PACKED netif_rx_interface_t;
/* Descriptor status values */
#define NETIF_RSP_DROPPED -2
#define NETIF_RSP_ERROR -1
#define NETIF_RSP_OKAY 0
#endif
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