/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#ifndef RING_H
#define RING_H

/*
 * "I love the smell of 10GbE in the morning. Smells like ... victory."
 *     - W. Richard Stevens, "Secret Teachings of the UNIX Environment"
 */

#include <stdio.h>
#include <stdint.h>
#include <linux/if_packet.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <sys/ioctl.h>
#include <string.h>
#include <poll.h>
#include <sys/poll.h>

#include "xutils.h"
#include "built_in.h"
#include "die.h"

union tpacket_uhdr {
	struct tpacket_hdr  *h1;
	struct tpacket2_hdr *h2;
	struct tpacket3_hdr *h3;
	void *raw;
};

struct frame_map {
	struct tpacket2_hdr tp_h __aligned_tpacket;
	struct sockaddr_ll s_ll __align_tpacket(sizeof(struct tpacket2_hdr));
};

struct block_desc {
	uint32_t version;
	uint32_t offset_to_priv;
	struct tpacket_hdr_v1 h1;
};

struct ring {
	struct iovec *frames;
	uint8_t *mm_space;
	size_t mm_len;
	struct sockaddr_ll s_ll;
	union {
		struct tpacket_req layout;
		struct tpacket_req3 layout3;
		uint8_t raw;
	};
};

static inline void next_rnd_slot(unsigned int *it, struct ring *ring)
{
	*it = rand() % ring->layout.tp_frame_nr;
}

static inline unsigned int ring_size(char *ifname, unsigned int size)
{
	if (size > 0)
		return size;

	/*
	 * Device bitrate in bytes times two as ring size.
	 *    Fallback => ~    64,00 MB
	 *     10 MBit => ~     2,38 MB
	 *     54 MBit => ~    12,88 MB
	 *    100 MBit => ~    23,84 MB
	 *    300 MBit => ~    71,52 MB
	 *  1.000 MBit => ~   238,42 MB
	 * 10.000 MBit => ~ 2.384.18 MB
	 */
	size = device_bitrate(ifname);
	size = (size * 1000000) / 8;
	size = size * 2;
	if (size == 0)
		size = 1 << 26;

	return round_up_cacheline(size);
}

static inline unsigned int ring_frame_size(struct ring *ring)
{
	return ring->layout.tp_frame_size;
}

static inline void ring_verify_layout(struct ring *ring)
{
	bug_on(ring->layout.tp_block_size  < ring->layout.tp_frame_size);
	bug_on((ring->layout.tp_block_size % ring->layout.tp_frame_size) != 0);
	bug_on((ring->layout.tp_block_size % getpagesize()) != 0);
}

static inline void tpacket_hdr_clone(struct tpacket2_hdr *thdrd,
				     struct tpacket2_hdr *thdrs)
{
        thdrd->tp_sec = thdrs->tp_sec;
        thdrd->tp_nsec = thdrs->tp_nsec;
        thdrd->tp_snaplen = thdrs->tp_snaplen;
        thdrd->tp_len = thdrs->tp_len;
}

static inline void prepare_polling(int sock, struct pollfd *pfd)
{
	memset(pfd, 0, sizeof(*pfd));
	pfd->fd = sock;
	pfd->revents = 0;
	pfd->events = POLLIN | POLLRDNORM | POLLERR;
}

static inline void __set_sockopt_tpacket(int sock, int val)
{
	int ret = setsockopt(sock, SOL_PACKET, PACKET_VERSION, &val, sizeof(val));
	if (ret)
		panic("Cannot set tpacketv2!\n");
}

static inline int __get_sockopt_tpacket(int sock)
{
	int val, ret;
	socklen_t len = sizeof(val);

	ret = getsockopt(sock, SOL_PACKET, PACKET_VERSION, &val, &len);
	if (ret)
		panic("Cannot get tpacket version!\n");

	return val;
}

static inline void set_sockopt_tpacket_v2(int sock)
{
	__set_sockopt_tpacket(sock, TPACKET_V2);
}

static inline void set_sockopt_tpacket_v3(int sock)
{
	__set_sockopt_tpacket(sock, TPACKET_V3);
}

static inline int get_sockopt_tpacket(int sock)
{
	return __get_sockopt_tpacket(sock);
}

extern void mmap_ring_generic(int sock, struct ring *ring);
extern void alloc_ring_frames_generic(struct ring *ring, int num, size_t size);
extern void bind_ring_generic(int sock, struct ring *ring, int ifindex);

#endif /* RING_H */
umentation/devicetree/bindings?id=a56711fa0b418a2cf5eefa00ee65e16443e47790&amp;id2=bf16200689118d19de1b8d2a3c314fc21f5dc7bb'>bindings</a>/<a href='/cgit.cgi/linux/net-next.git/diff/Documentation/devicetree/bindings/mmc?id=a56711fa0b418a2cf5eefa00ee65e16443e47790&amp;id2=bf16200689118d19de1b8d2a3c314fc21f5dc7bb'>mmc</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='a56711fa0b418a2cf5eefa00ee65e16443e47790'/><input type='hidden' name='id2' value='bf16200689118d19de1b8d2a3c314fc21f5dc7bb'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=a56711fa0b418a2cf5eefa00ee65e16443e47790&amp;id2=bf16200689118d19de1b8d2a3c314fc21f5dc7bb'>Diffstat</a> (limited to 'Documentation/devicetree/bindings/mmc')</div><table summary='diffstat' class='diffstat'>