/*
 * 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 "built_in.h"
#include "die.h"
#include "dev.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 */
ss='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><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Chao Yu &lt;yuchao0@huawei.com&gt;</td><td class='right'>2016-08-19 23:13:47 +0800</td></tr>
<tr><th>committer</th><td>Jaegeuk Kim &lt;jaegeuk@kernel.org&gt;</td><td class='right'>2016-08-29 18:31:09 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=d600af236da51d9e3b90d21a23f95b820bd02e2f'>d600af236da51d9e3b90d21a23f95b820bd02e2f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=d600af236da51d9e3b90d21a23f95b820bd02e2f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d600af236da51d9e3b90d21a23f95b820bd02e2f'>062e92b147c18b8f125ef30f1fdfd7da736064f4</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=43ced84ec8a7cb1b2e56dd1e262a0c63db79c3c1'>43ced84ec8a7cb1b2e56dd1e262a0c63db79c3c1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=d600af236da51d9e3b90d21a23f95b820bd02e2f&amp;id2=43ced84ec8a7cb1b2e56dd1e262a0c63db79c3c1'>diff</a>)</td></tr></table>
<div class='commit-subject'>f2fs: avoid unneeded loop in build_sit_entries</div><div class='commit-msg'>When building each sit entry in cache, firstly, we will load it from
sit page, and then check all entries in sit journal, if there is one
updated entry in journal, cover cached entry with the journaled one.

Actually, most of check operation is unneeded since we only need
to update cached entries with journaled entries in batch, so
changing the flow as below for more efficient:
1. load all sit entries into cache from sit pages;
2. update sit entries with journal.

Signed-off-by: Chao Yu &lt;yuchao0@huawei.com&gt;
Signed-off-by: Jaegeuk Kim &lt;jaegeuk@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d600af236da51d9e3b90d21a23f95b820bd02e2f'>Diffstat</a></div><table summary='diffstat' class='diffstat'>