rawtx.h.3

实现一个网卡到内存空间的零拷贝程序

/*
 *  rawtx.h
 *  Joris van Rantwijk, May 2001.
 *
 *  Desperate attempt to implement a quick-and-dirty zero-copy
 *  networking interface in the Linux kernel.
 */

#include <linux/types.h>
#include <linux/unistd.h>
#include <asm/atomic.h>

#define RAWTX_MAJOR		241

#define RAWTX_BUFPOOL_SIZE	65536
#define RAWTX_BUF_SIZE		2048

#define RAWTX_IOCTL_SETDEVICE   1
#define RAWTX_IOCTL_SETPROTO	2
#define RAWTX_IOCTL_SETSADDR    3
#define RAWTX_IOCTL_SETDADDR    4
#define RAWTX_IOCTL_SETSRCADDR	5
#define RAWTX_IOCTL_SETDSTADDR	6
#define RAWTX_IOCTL_SETQUEUELEN 7
#define RAWTX_IOCTL_GETBUFFER	8
#define RAWTX_IOCTL_SENDBUFFER	9

#define RAWTX_PROTO_RAW		1
#define RAWTX_PROTO_ETHERNET	2
#define RAWTX_PROTO_UDPIP	3
#define RAWTX_PROTO_UDPIP_NOSUM 4

struct rawtx_private_data;

struct rawtx_buffer {
	struct rawtx_buffer * nextfree;
	struct rawtx_private_data * used_by;
	atomic_t usecount;
	unsigned int data_ofs;
	int data_len;
};

/* end */