#include <linux/unistd.h>
#include <linux/bpf.h>

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/socket.h>

#include "bpf_load.h"
#include "libbpf.h"
#include "sock_example.h"

#define BPF_F_PIN	(1 << 0)
#define BPF_F_GET	(1 << 1)
#define BPF_F_PIN_GET	(BPF_F_PIN | BPF_F_GET)

#define BPF_F_KEY	(1 << 2)
#define BPF_F_VAL	(1 << 3)
#define BPF_F_KEY_VAL	(BPF_F_KEY | BPF_F_VAL)

#define BPF_M_UNSPEC	0
#define BPF_M_MAP	1
#define BPF_M_PROG	2

static void usage(void)
{
	printf("Usage: fds_example [...]\n");
	printf("       -F <file>   File to pin/get object\n");
	printf("       -P          |- pin object\n");
	printf("       -G          `- get object\n");
	printf("       -m          eBPF map mode\n");
	printf("       -k <key>    |- map key\n");
	printf("       -v <value>  `- map value\n");
	printf("       -p          eBPF prog mode\n");
	printf("       -o <object> `- object file\n");
	printf("       -h          Display this help.\n");
}

static int bpf_map_create(void)
{
	return bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(uint32_t),
			      sizeof(uint32_t), 1024, 0);
}

static int bpf_prog_create(const char *object)
{
	static struct bpf_insn insns[] = {
		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
	};
	size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn);

	if (object) {
		assert(!load_bpf_file((char *)object));
		return prog_fd[0];
	} else {
		return bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER,
					insns, insns_cnt, "GPL", 0,
					bpf_log_buf, BPF_LOG_BUF_SIZE);
	}
}

static int bpf_do_map(const char *file, uint32_t flags, uint32_t key,
		      uint32_t value)
{
	int fd, ret;

	if (flags & BPF_F_PIN) {
		fd = bpf_map_create();
		printf("bpf: map fd:%d (%s)\n", fd, strerror(errno));
		assert(fd > 0);

		ret = bpf_obj_pin(fd, file);
		printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
		assert(ret == 0);
	} else {
		fd = bpf_obj_get(file);
		printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
		assert(fd > 0);
	}

	if ((flags & BPF_F_KEY_VAL) == BPF_F_KEY_VAL) {
		ret = bpf_map_update_elem(fd, &key, &value, 0);
		printf("bpf: fd:%d u->(%u:%u) ret:(%d,%s)\n", fd, key, value,
		       ret, strerror(errno));
		assert(ret == 0);
	} else if (flags & BPF_F_KEY) {
		ret = bpf_map_lookup_elem(fd, &key, &value);
		printf("bpf: fd:%d l->(%u):%u ret:(%d,%s)\n", fd, key, value,
		       ret, strerror(errno));
		assert(ret == 0);
	}

	return 0;
}

static int bpf_do_prog(const char *file, uint32_t flags, const char *object)
{
	int fd, sock, ret;

	if (flags & BPF_F_PIN) {
		fd = bpf_prog_create(object);
		printf("bpf: prog fd:%d (%s)\n", fd, strerror(errno));
		assert(fd > 0);

		ret = bpf_obj_pin(fd, file);
		printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
		assert(ret == 0);
	} else {
		fd = bpf_obj_get(file);
		printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
		assert(fd > 0);
	}

	sock = open_raw_sock("lo");
	assert(sock > 0);

	ret = setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &fd, sizeof(fd));
	printf("bpf: sock:%d <- fd:%d attached ret:(%d,%s)\n", sock, fd,
	       ret, strerror(errno));
	assert(ret == 0);

	return 0;
}

int main(int argc, char **argv)
{
	const char *file = NULL, *object = NULL;
	uint32_t key = 0, value = 0, flags = 0;
	int opt, mode = BPF_M_UNSPEC;

	while ((opt = getopt(argc, argv, "F:PGmk:v:po:")) != -1) {
		switch (opt) {
		/* General args */
		case 'F':
			file = optarg;
			break;
		case 'P':
			flags |= BPF_F_PIN;
			break;
		case 'G':
			flags |= BPF_F_GET;
			break;
		/* Map-related args */
		case 'm':
			mode = BPF_M_MAP;
			break;
		case 'k':
			key = strtoul(optarg, NULL, 0);
			flags |= BPF_F_KEY;
			break;
		case 'v':
			value = strtoul(optarg, NULL, 0);
			flags |= BPF_F_VAL;
			break;
		/* Prog-related args */
		case 'p':
			mode = BPF_M_PROG;
			break;
		case 'o':
			object = optarg;
			break;
		default:
			goto out;
		}
	}

	if (!(flags & BPF_F_PIN_GET) || !file)
		goto out;

	switch (mode) {
	case BPF_M_MAP:
		return bpf_do_map(file, flags, key, value);
	case BPF_M_PROG:
		return bpf_do_prog(file, flags, object);
	}
out:
	usage();
	return -1;
}
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><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Dexuan Cui &lt;decui@microsoft.com&gt;</td><td class='right'>2017-01-28 11:46:02 -0700</td></tr>
<tr><th>committer</th><td>Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;</td><td class='right'>2017-01-31 10:59:48 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/exynos5433.h?id=433e19cf33d34bb6751c874a9c00980552fe508c'>433e19cf33d34bb6751c874a9c00980552fe508c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/dt-bindings/clock/exynos5433.h?id=433e19cf33d34bb6751c874a9c00980552fe508c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=433e19cf33d34bb6751c874a9c00980552fe508c'>ce6547ef2987fbb289fa28f03536328a42781651</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/clock/exynos5433.h?id=433e19cf33d34bb6751c874a9c00980552fe508c'>include/dt-bindings/clock/exynos5433.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/exynos5433.h?id=191e885a2e130e639bb0c8ee350d7047294f2ce6'>191e885a2e130e639bb0c8ee350d7047294f2ce6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/exynos5433.h?id=433e19cf33d34bb6751c874a9c00980552fe508c&amp;id2=191e885a2e130e639bb0c8ee350d7047294f2ce6'>diff</a>)</td></tr></table>
<div class='commit-subject'>Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()</div><div class='commit-msg'>Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")
added the proper mb(), but removed the test "prev_write_sz &lt; pending_sz"
when making the signal decision.

As a result, the guest can signal the host unnecessarily,
and then the host can throttle the guest because the host
thinks the guest is buggy or malicious; finally the user
running stress test can perceive intermittent freeze of
the guest.

This patch brings back the test, and properly handles the
in-place consumption APIs used by NetVSC (see get_next_pkt_raw(),
put_pkt_raw() and commit_rd_index()).

Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")

Signed-off-by: Dexuan Cui &lt;decui@microsoft.com&gt;
Reported-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Tested-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Cc: "K. Y. Srinivasan" &lt;kys@microsoft.com&gt;
Cc: Haiyang Zhang &lt;haiyangz@microsoft.com&gt;
Cc: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: K. Y. Srinivasan &lt;kys@microsoft.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=433e19cf33d34bb6751c874a9c00980552fe508c'>Diffstat</a> (limited to 'include/dt-bindings/clock/exynos5433.h')</div><table summary='diffstat' class='diffstat'>