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https://github.com/xen-project/xen.git
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kaf24@freefall.cl.cam.ac.uk
908871cf62
Rename Xen public interfaces.
1. hypervisor-if.h is now xen.h
2. hypervisor-ifs/ directory is now:
<include/public/...> in Xen
<asm/xen-public/...> in Linux
<xen/...> in user space
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/******************************************************************************
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* netif.h
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*
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* Unified network-device I/O interface for Xen guest OSes.
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*
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* Copyright (c) 2003-2004, Keir Fraser
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*/
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#ifndef __XEN_PUBLIC_IO_NETIF_H__
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#define __XEN_PUBLIC_IO_NETIF_H__
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typedef struct {
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memory_t addr; /* 0: Machine address of packet. */
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MEMORY_PADDING;
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u16 id; /* 8: Echoed in response message. */
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u16 size; /* 10: Packet size in bytes. */
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} PACKED netif_tx_request_t; /* 12 bytes */
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typedef struct {
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u16 id; /* 0 */
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s8 status; /* 2 */
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u8 __pad; /* 3 */
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} PACKED netif_tx_response_t; /* 4 bytes */
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typedef struct {
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u16 id; /* 0: Echoed in response message. */
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} PACKED netif_rx_request_t; /* 2 bytes */
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typedef struct {
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memory_t addr; /* 0: Machine address of packet. */
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MEMORY_PADDING;
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u16 id; /* 8: */
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s16 status; /* 10: -ve: BLKIF_RSP_* ; +ve: Rx'ed pkt size. */
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} PACKED netif_rx_response_t; /* 12 bytes */
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/*
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* We use a special capitalised type name because it is _essential_ that all
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* arithmetic on indexes is done on an integer type of the correct size.
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*/
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typedef u32 NETIF_RING_IDX;
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/*
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* Ring indexes are 'free running'. That is, they are not stored modulo the
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* size of the ring buffer. The following macros convert a free-running counter
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* into a value that can directly index a ring-buffer array.
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*/
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#define MASK_NETIF_RX_IDX(_i) ((_i)&(NETIF_RX_RING_SIZE-1))
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#define MASK_NETIF_TX_IDX(_i) ((_i)&(NETIF_TX_RING_SIZE-1))
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#define NETIF_TX_RING_SIZE 256
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#define NETIF_RX_RING_SIZE 256
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/* This structure must fit in a memory page. */
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typedef struct {
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/*
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* Frontend places packets into ring at tx_req_prod.
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* Frontend receives event when tx_resp_prod passes tx_event.
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* 'req_cons' is a shadow of the backend's request consumer -- the frontend
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* may use it to determine if all queued packets have been seen by the
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* backend.
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*/
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NETIF_RING_IDX req_prod; /* 0 */
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NETIF_RING_IDX req_cons; /* 4 */
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NETIF_RING_IDX resp_prod; /* 8 */
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NETIF_RING_IDX event; /* 12 */
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union { /* 16 */
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netif_tx_request_t req;
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netif_tx_response_t resp;
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} PACKED ring[NETIF_TX_RING_SIZE];
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} PACKED netif_tx_interface_t;
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/* This structure must fit in a memory page. */
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typedef struct {
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/*
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* Frontend places empty buffers into ring at rx_req_prod.
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* Frontend receives event when rx_resp_prod passes rx_event.
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*/
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NETIF_RING_IDX req_prod; /* 0 */
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NETIF_RING_IDX resp_prod; /* 4 */
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NETIF_RING_IDX event; /* 8 */
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union { /* 12 */
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netif_rx_request_t req;
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netif_rx_response_t resp;
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} PACKED ring[NETIF_RX_RING_SIZE];
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} PACKED netif_rx_interface_t;
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/* Descriptor status values */
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#define NETIF_RSP_DROPPED -2
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#define NETIF_RSP_ERROR -1
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#define NETIF_RSP_OKAY 0
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#endif
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