tools/testing/selftests/net/psock_fanout.c - third_party/linux - Git at Google

 /*
  * Copyright 2013 Google Inc.
  * Author: Willem de Bruijn (willemb@google.com)
  *
  * A basic test of packet socket fanout behavior.
  *
  * Control:
  * - create fanout fails as expected with illegal flag combinations
  * - join   fanout fails as expected with diverging types or flags
  *
  * Datapath:
  *   Open a pair of packet sockets and a pair of INET sockets, send a known
  *   number of packets across the two INET sockets and count the number of
  *   packets enqueued onto the two packet sockets.
  *
  *   The test currently runs for
  *   - PACKET_FANOUT_HASH
  *   - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
  *   - PACKET_FANOUT_LB
  *   - PACKET_FANOUT_CPU
  *   - PACKET_FANOUT_ROLLOVER
  *   - PACKET_FANOUT_CBPF
  *   - PACKET_FANOUT_EBPF
  *
  * Todo:
  * - functionality: PACKET_FANOUT_FLAG_DEFRAG
  *
  * License (GPLv2):
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  */

 #define _GNU_SOURCE		/* for sched_setaffinity */

 #include <arpa/inet.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/unistd.h>	/* for __NR_bpf */
 #include <linux/filter.h>
 #include <linux/bpf.h>
 #include <linux/if_packet.h>
 #include <net/ethernet.h>
 #include <netinet/ip.h>
 #include <netinet/udp.h>
 #include <poll.h>
 #include <sched.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>

 #include "psock_lib.h"

 #define RING_NUM_FRAMES			20

 /* Open a socket in a given fanout mode.
  * @return -1 if mode is bad, a valid socket otherwise */
 static int sock_fanout_open(uint16_t typeflags, int num_packets)
 {
 	int fd, val;

 	fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
 	if (fd < 0) {
 		perror("socket packet");
 		exit(1);
 	}

 	/* fanout group ID is always 0: tests whether old groups are deleted */
 	val = ((int) typeflags) << 16;
 	if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
 		if (close(fd)) {
 			perror("close packet");
 			exit(1);
 		}
 		return -1;
 	}

 	pair_udp_setfilter(fd);
 	return fd;
 }

 static void sock_fanout_set_ebpf(int fd)
 {
 	const int len_off = __builtin_offsetof(struct __sk_buff, len);
 	struct bpf_insn prog[] = {
 		{ BPF_ALU64 | BPF_MOV | BPF_X,   6, 1, 0, 0 },
 		{ BPF_LDX   | BPF_W   | BPF_MEM, 0, 6, len_off, 0 },
 		{ BPF_JMP   | BPF_JGE | BPF_K,   0, 0, 1, DATA_LEN },
 		{ BPF_JMP   | BPF_JA  | BPF_K,   0, 0, 4, 0 },
 		{ BPF_LD    | BPF_B   | BPF_ABS, 0, 0, 0, 0x50 },
 		{ BPF_JMP   | BPF_JEQ | BPF_K,   0, 0, 2, DATA_CHAR },
 		{ BPF_JMP   | BPF_JEQ | BPF_K,   0, 0, 1, DATA_CHAR_1 },
 		{ BPF_ALU   | BPF_MOV | BPF_K,   0, 0, 0, 0 },
 		{ BPF_JMP   | BPF_EXIT,          0, 0, 0, 0 }
 	};
 	char log_buf[512];
 	union bpf_attr attr;
 	int pfd;

 	memset(&attr, 0, sizeof(attr));
 	attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
 	attr.insns = (unsigned long) prog;
 	attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
 	attr.license = (unsigned long) "GPL";
 	attr.log_buf = (unsigned long) log_buf,
 	attr.log_size = sizeof(log_buf),
 	attr.log_level = 1,

 	pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
 	if (pfd < 0) {
 		perror("bpf");
 		fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
 		exit(1);
 	}

 	if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
 		perror("fanout data ebpf");
 		exit(1);
 	}

 	if (close(pfd)) {
 		perror("close ebpf");
 		exit(1);
 	}
 }

 static char *sock_fanout_open_ring(int fd)
 {
 	struct tpacket_req req = {
 		.tp_block_size = getpagesize(),
 		.tp_frame_size = getpagesize(),
 		.tp_block_nr   = RING_NUM_FRAMES,
 		.tp_frame_nr   = RING_NUM_FRAMES,
 	};
 	char *ring;
 	int val = TPACKET_V2;

 	if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
 		       sizeof(val))) {
 		perror("packetsock ring setsockopt version");
 		exit(1);
 	}
 	if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
 		       sizeof(req))) {
 		perror("packetsock ring setsockopt");
 		exit(1);
 	}

 	ring = mmap(0, req.tp_block_size * req.tp_block_nr,
 		    PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 	if (ring == MAP_FAILED) {
 		perror("packetsock ring mmap");
 		exit(1);
 	}

 	return ring;
 }

 static int sock_fanout_read_ring(int fd, void *ring)
 {
 	struct tpacket2_hdr *header = ring;
 	int count = 0;

 	while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
 		count++;
 		header = ring + (count * getpagesize());
 	}

 	return count;
 }

 static int sock_fanout_read(int fds[], char *rings[], const int expect[])
 {
 	int ret[2];

 	ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
 	ret[1] = sock_fanout_read_ring(fds[1], rings[1]);

 	fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
 			ret[0], ret[1], expect[0], expect[1]);

 	if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
 	    (!(ret[0] == expect[1] && ret[1] == expect[0]))) {
 		fprintf(stderr, "ERROR: incorrect queue lengths\n");
 		return 1;
 	}

 	return 0;
 }

 /* Test illegal mode + flag combination */
 static void test_control_single(void)
 {
 	fprintf(stderr, "test: control single socket\n");

 	if (sock_fanout_open(PACKET_FANOUT_ROLLOVER |
 			       PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
 		fprintf(stderr, "ERROR: opened socket with dual rollover\n");
 		exit(1);
 	}
 }

 /* Test illegal group with different modes or flags */
 static void test_control_group(void)
 {
 	int fds[2];

 	fprintf(stderr, "test: control multiple sockets\n");

 	fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
 	if (fds[0] == -1) {
 		fprintf(stderr, "ERROR: failed to open HASH socket\n");
 		exit(1);
 	}
 	if (sock_fanout_open(PACKET_FANOUT_HASH |
 			       PACKET_FANOUT_FLAG_DEFRAG, 10) != -1) {
 		fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
 		exit(1);
 	}
 	if (sock_fanout_open(PACKET_FANOUT_HASH |
 			       PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) {
 		fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
 		exit(1);
 	}
 	if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) {
 		fprintf(stderr, "ERROR: joined group with wrong mode\n");
 		exit(1);
 	}
 	fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
 	if (fds[1] == -1) {
 		fprintf(stderr, "ERROR: failed to join group\n");
 		exit(1);
 	}
 	if (close(fds[1]) || close(fds[0])) {
 		fprintf(stderr, "ERROR: closing sockets\n");
 		exit(1);
 	}
 }

 static int test_datapath(uint16_t typeflags, int port_off,
 			 const int expect1[], const int expect2[])
 {
 	const int expect0[] = { 0, 0 };
 	char *rings[2];
 	uint8_t type = typeflags & 0xFF;
 	int fds[2], fds_udp[2][2], ret;

 	fprintf(stderr, "test: datapath 0x%hx\n", typeflags);

 	fds[0] = sock_fanout_open(typeflags, 20);
 	fds[1] = sock_fanout_open(typeflags, 20);
 	if (fds[0] == -1 || fds[1] == -1) {
 		fprintf(stderr, "ERROR: failed open\n");
 		exit(1);
 	}
 	if (type == PACKET_FANOUT_CBPF)
 		sock_setfilter(fds[0], SOL_PACKET, PACKET_FANOUT_DATA);
 	else if (type == PACKET_FANOUT_EBPF)
 		sock_fanout_set_ebpf(fds[0]);

 	rings[0] = sock_fanout_open_ring(fds[0]);
 	rings[1] = sock_fanout_open_ring(fds[1]);
 	pair_udp_open(fds_udp[0], PORT_BASE);
 	pair_udp_open(fds_udp[1], PORT_BASE + port_off);
 	sock_fanout_read(fds, rings, expect0);

 	/* Send data, but not enough to overflow a queue */
 	pair_udp_send(fds_udp[0], 15);
 	pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);
 	ret = sock_fanout_read(fds, rings, expect1);

 	/* Send more data, overflow the queue */
 	pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);
 	/* TODO: ensure consistent order between expect1 and expect2 */
 	ret |= sock_fanout_read(fds, rings, expect2);

 	if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) ||
 	    munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
 		fprintf(stderr, "close rings\n");
 		exit(1);
 	}
 	if (close(fds_udp[1][1]) || close(fds_udp[1][0]) ||
 	    close(fds_udp[0][1]) || close(fds_udp[0][0]) ||
 	    close(fds[1]) || close(fds[0])) {
 		fprintf(stderr, "close datapath\n");
 		exit(1);
 	}

 	return ret;
 }

 static int set_cpuaffinity(int cpuid)
 {
 	cpu_set_t mask;

 	CPU_ZERO(&mask);
 	CPU_SET(cpuid, &mask);
 	if (sched_setaffinity(0, sizeof(mask), &mask)) {
 		if (errno != EINVAL) {
 			fprintf(stderr, "setaffinity %d\n", cpuid);
 			exit(1);
 		}
 		return 1;
 	}

 	return 0;
 }

 int main(int argc, char **argv)
 {
 	const int expect_hash[2][2]	= { { 15, 5 },  { 20, 5 } };
 	const int expect_hash_rb[2][2]	= { { 15, 5 },  { 20, 15 } };
 	const int expect_lb[2][2]	= { { 10, 10 }, { 18, 17 } };
 	const int expect_rb[2][2]	= { { 15, 5 },  { 20, 15 } };
 	const int expect_cpu0[2][2]	= { { 20, 0 },  { 20, 0 } };
 	const int expect_cpu1[2][2]	= { { 0, 20 },  { 0, 20 } };
 	const int expect_bpf[2][2]	= { { 15, 5 },  { 15, 20 } };
 	int port_off = 2, tries = 5, ret;

 	test_control_single();
 	test_control_group();

 	/* find a set of ports that do not collide onto the same socket */
 	ret = test_datapath(PACKET_FANOUT_HASH, port_off,
 			    expect_hash[0], expect_hash[1]);
 	while (ret && tries--) {
 		fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
 		ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
 				    expect_hash[0], expect_hash[1]);
 	}

 	ret |= test_datapath(PACKET_FANOUT_HASH | PACKET_FANOUT_FLAG_ROLLOVER,
 			     port_off, expect_hash_rb[0], expect_hash_rb[1]);
 	ret |= test_datapath(PACKET_FANOUT_LB,
 			     port_off, expect_lb[0], expect_lb[1]);
 	ret |= test_datapath(PACKET_FANOUT_ROLLOVER,
 			     port_off, expect_rb[0], expect_rb[1]);

 	ret |= test_datapath(PACKET_FANOUT_CBPF,
 			     port_off, expect_bpf[0], expect_bpf[1]);
 	ret |= test_datapath(PACKET_FANOUT_EBPF,
 			     port_off, expect_bpf[0], expect_bpf[1]);

 	set_cpuaffinity(0);
 	ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
 			     expect_cpu0[0], expect_cpu0[1]);
 	if (!set_cpuaffinity(1))
 		/* TODO: test that choice alternates with previous */
 		ret |= test_datapath(PACKET_FANOUT_CPU, port_off,
 				     expect_cpu1[0], expect_cpu1[1]);

 	if (ret)
 		return 1;

 	printf("OK. All tests passed\n");
 	return 0;
 }
	/*
	* Copyright 2013 Google Inc.
	* Author: Willem de Bruijn (willemb@google.com)
	*
	* A basic test of packet socket fanout behavior.
	*
	* Control:
	* - create fanout fails as expected with illegal flag combinations
	* - join fanout fails as expected with diverging types or flags
	*
	* Datapath:
	* Open a pair of packet sockets and a pair of INET sockets, send a known
	* number of packets across the two INET sockets and count the number of
	* packets enqueued onto the two packet sockets.
	*
	* The test currently runs for
	* - PACKET_FANOUT_HASH
	* - PACKET_FANOUT_HASH with PACKET_FANOUT_FLAG_ROLLOVER
	* - PACKET_FANOUT_LB
	* - PACKET_FANOUT_CPU
	* - PACKET_FANOUT_ROLLOVER
	* - PACKET_FANOUT_CBPF
	* - PACKET_FANOUT_EBPF
	*
	* Todo:
	* - functionality: PACKET_FANOUT_FLAG_DEFRAG
	*
	* License (GPLv2):
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#define _GNU_SOURCE /* for sched_setaffinity */

	#include <arpa/inet.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <linux/unistd.h> /* for __NR_bpf */
	#include <linux/filter.h>
	#include <linux/bpf.h>
	#include <linux/if_packet.h>
	#include <net/ethernet.h>
	#include <netinet/ip.h>
	#include <netinet/udp.h>
	#include <poll.h>
	#include <sched.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/mman.h>
	#include <sys/socket.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <unistd.h>

	#include "psock_lib.h"

	#define RING_NUM_FRAMES 20

	/* Open a socket in a given fanout mode.
	* @return -1 if mode is bad, a valid socket otherwise */
	static int sock_fanout_open(uint16_t typeflags, int num_packets)
	{
	int fd, val;

	fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
	if (fd < 0) {
	perror("socket packet");
	exit(1);
	}

	/* fanout group ID is always 0: tests whether old groups are deleted */
	val = ((int) typeflags) << 16;
	if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val))) {
	if (close(fd)) {
	perror("close packet");
	exit(1);
	}
	return -1;
	}

	pair_udp_setfilter(fd);
	return fd;
	}

	static void sock_fanout_set_ebpf(int fd)
	{
	const int len_off = __builtin_offsetof(struct __sk_buff, len);
	struct bpf_insn prog[] = {
	{ BPF_ALU64 \| BPF_MOV \| BPF_X, 6, 1, 0, 0 },
	{ BPF_LDX \| BPF_W \| BPF_MEM, 0, 6, len_off, 0 },
	{ BPF_JMP \| BPF_JGE \| BPF_K, 0, 0, 1, DATA_LEN },
	{ BPF_JMP \| BPF_JA \| BPF_K, 0, 0, 4, 0 },
	{ BPF_LD \| BPF_B \| BPF_ABS, 0, 0, 0, 0x50 },
	{ BPF_JMP \| BPF_JEQ \| BPF_K, 0, 0, 2, DATA_CHAR },
	{ BPF_JMP \| BPF_JEQ \| BPF_K, 0, 0, 1, DATA_CHAR_1 },
	{ BPF_ALU \| BPF_MOV \| BPF_K, 0, 0, 0, 0 },
	{ BPF_JMP \| BPF_EXIT, 0, 0, 0, 0 }
	};
	char log_buf[512];
	union bpf_attr attr;
	int pfd;

	memset(&attr, 0, sizeof(attr));
	attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;
	attr.insns = (unsigned long) prog;
	attr.insn_cnt = sizeof(prog) / sizeof(prog[0]);
	attr.license = (unsigned long) "GPL";
	attr.log_buf = (unsigned long) log_buf,
	attr.log_size = sizeof(log_buf),
	attr.log_level = 1,

	pfd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
	if (pfd < 0) {
	perror("bpf");
	fprintf(stderr, "bpf verifier:\n%s\n", log_buf);
	exit(1);
	}

	if (setsockopt(fd, SOL_PACKET, PACKET_FANOUT_DATA, &pfd, sizeof(pfd))) {
	perror("fanout data ebpf");
	exit(1);
	}

	if (close(pfd)) {
	perror("close ebpf");
	exit(1);
	}
	}

	static char *sock_fanout_open_ring(int fd)
	{
	struct tpacket_req req = {
	.tp_block_size = getpagesize(),
	.tp_frame_size = getpagesize(),
	.tp_block_nr = RING_NUM_FRAMES,
	.tp_frame_nr = RING_NUM_FRAMES,
	};
	char *ring;
	int val = TPACKET_V2;

	if (setsockopt(fd, SOL_PACKET, PACKET_VERSION, (void *) &val,
	sizeof(val))) {
	perror("packetsock ring setsockopt version");
	exit(1);
	}
	if (setsockopt(fd, SOL_PACKET, PACKET_RX_RING, (void *) &req,
	sizeof(req))) {
	perror("packetsock ring setsockopt");
	exit(1);
	}

	ring = mmap(0, req.tp_block_size * req.tp_block_nr,
	PROT_READ \| PROT_WRITE, MAP_SHARED, fd, 0);
	if (ring == MAP_FAILED) {
	perror("packetsock ring mmap");
	exit(1);
	}

	return ring;
	}

	static int sock_fanout_read_ring(int fd, void *ring)
	{
	struct tpacket2_hdr *header = ring;
	int count = 0;

	while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
	count++;
	header = ring + (count * getpagesize());
	}

	return count;
	}

	static int sock_fanout_read(int fds[], char *rings[], const int expect[])
	{
	int ret[2];

	ret[0] = sock_fanout_read_ring(fds[0], rings[0]);
	ret[1] = sock_fanout_read_ring(fds[1], rings[1]);

	fprintf(stderr, "info: count=%d,%d, expect=%d,%d\n",
	ret[0], ret[1], expect[0], expect[1]);

	if ((!(ret[0] == expect[0] && ret[1] == expect[1])) &&
	(!(ret[0] == expect[1] && ret[1] == expect[0]))) {
	fprintf(stderr, "ERROR: incorrect queue lengths\n");
	return 1;
	}

	return 0;
	}

	/* Test illegal mode + flag combination */
	static void test_control_single(void)
	{
	fprintf(stderr, "test: control single socket\n");

	if (sock_fanout_open(PACKET_FANOUT_ROLLOVER \|
	PACKET_FANOUT_FLAG_ROLLOVER, 0) != -1) {
	fprintf(stderr, "ERROR: opened socket with dual rollover\n");
	exit(1);
	}
	}

	/* Test illegal group with different modes or flags */
	static void test_control_group(void)
	{
	int fds[2];

	fprintf(stderr, "test: control multiple sockets\n");

	fds[0] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
	if (fds[0] == -1) {
	fprintf(stderr, "ERROR: failed to open HASH socket\n");
	exit(1);
	}
	if (sock_fanout_open(PACKET_FANOUT_HASH \|
	PACKET_FANOUT_FLAG_DEFRAG, 10) != -1) {
	fprintf(stderr, "ERROR: joined group with wrong flag defrag\n");
	exit(1);
	}
	if (sock_fanout_open(PACKET_FANOUT_HASH \|
	PACKET_FANOUT_FLAG_ROLLOVER, 10) != -1) {
	fprintf(stderr, "ERROR: joined group with wrong flag ro\n");
	exit(1);
	}
	if (sock_fanout_open(PACKET_FANOUT_CPU, 10) != -1) {
	fprintf(stderr, "ERROR: joined group with wrong mode\n");
	exit(1);
	}
	fds[1] = sock_fanout_open(PACKET_FANOUT_HASH, 20);
	if (fds[1] == -1) {
	fprintf(stderr, "ERROR: failed to join group\n");
	exit(1);
	}
	if (close(fds[1]) \|\| close(fds[0])) {
	fprintf(stderr, "ERROR: closing sockets\n");
	exit(1);
	}
	}

	static int test_datapath(uint16_t typeflags, int port_off,
	const int expect1[], const int expect2[])
	{
	const int expect0[] = { 0, 0 };
	char *rings[2];
	uint8_t type = typeflags & 0xFF;
	int fds[2], fds_udp[2][2], ret;

	fprintf(stderr, "test: datapath 0x%hx\n", typeflags);

	fds[0] = sock_fanout_open(typeflags, 20);
	fds[1] = sock_fanout_open(typeflags, 20);
	if (fds[0] == -1 \|\| fds[1] == -1) {
	fprintf(stderr, "ERROR: failed open\n");
	exit(1);
	}
	if (type == PACKET_FANOUT_CBPF)
	sock_setfilter(fds[0], SOL_PACKET, PACKET_FANOUT_DATA);
	else if (type == PACKET_FANOUT_EBPF)
	sock_fanout_set_ebpf(fds[0]);

	rings[0] = sock_fanout_open_ring(fds[0]);
	rings[1] = sock_fanout_open_ring(fds[1]);
	pair_udp_open(fds_udp[0], PORT_BASE);
	pair_udp_open(fds_udp[1], PORT_BASE + port_off);
	sock_fanout_read(fds, rings, expect0);

	/* Send data, but not enough to overflow a queue */
	pair_udp_send(fds_udp[0], 15);
	pair_udp_send_char(fds_udp[1], 5, DATA_CHAR_1);
	ret = sock_fanout_read(fds, rings, expect1);

	/* Send more data, overflow the queue */
	pair_udp_send_char(fds_udp[0], 15, DATA_CHAR_1);
	/* TODO: ensure consistent order between expect1 and expect2 */
	ret \|= sock_fanout_read(fds, rings, expect2);

	if (munmap(rings[1], RING_NUM_FRAMES * getpagesize()) \|\|
	munmap(rings[0], RING_NUM_FRAMES * getpagesize())) {
	fprintf(stderr, "close rings\n");
	exit(1);
	}
	if (close(fds_udp[1][1]) \|\| close(fds_udp[1][0]) \|\|
	close(fds_udp[0][1]) \|\| close(fds_udp[0][0]) \|\|
	close(fds[1]) \|\| close(fds[0])) {
	fprintf(stderr, "close datapath\n");
	exit(1);
	}

	return ret;
	}

	static int set_cpuaffinity(int cpuid)
	{
	cpu_set_t mask;

	CPU_ZERO(&mask);
	CPU_SET(cpuid, &mask);
	if (sched_setaffinity(0, sizeof(mask), &mask)) {
	if (errno != EINVAL) {
	fprintf(stderr, "setaffinity %d\n", cpuid);
	exit(1);
	}
	return 1;
	}

	return 0;
	}

	int main(int argc, char **argv)
	{
	const int expect_hash[2][2] = { { 15, 5 }, { 20, 5 } };
	const int expect_hash_rb[2][2] = { { 15, 5 }, { 20, 15 } };
	const int expect_lb[2][2] = { { 10, 10 }, { 18, 17 } };
	const int expect_rb[2][2] = { { 15, 5 }, { 20, 15 } };
	const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } };
	const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 20 } };
	const int expect_bpf[2][2] = { { 15, 5 }, { 15, 20 } };
	int port_off = 2, tries = 5, ret;

	test_control_single();
	test_control_group();

	/* find a set of ports that do not collide onto the same socket */
	ret = test_datapath(PACKET_FANOUT_HASH, port_off,
	expect_hash[0], expect_hash[1]);
	while (ret && tries--) {
	fprintf(stderr, "info: trying alternate ports (%d)\n", tries);
	ret = test_datapath(PACKET_FANOUT_HASH, ++port_off,
	expect_hash[0], expect_hash[1]);
	}

	ret \|= test_datapath(PACKET_FANOUT_HASH \| PACKET_FANOUT_FLAG_ROLLOVER,
	port_off, expect_hash_rb[0], expect_hash_rb[1]);
	ret \|= test_datapath(PACKET_FANOUT_LB,
	port_off, expect_lb[0], expect_lb[1]);
	ret \|= test_datapath(PACKET_FANOUT_ROLLOVER,
	port_off, expect_rb[0], expect_rb[1]);

	ret \|= test_datapath(PACKET_FANOUT_CBPF,
	port_off, expect_bpf[0], expect_bpf[1]);
	ret \|= test_datapath(PACKET_FANOUT_EBPF,
	port_off, expect_bpf[0], expect_bpf[1]);

	set_cpuaffinity(0);
	ret \|= test_datapath(PACKET_FANOUT_CPU, port_off,
	expect_cpu0[0], expect_cpu0[1]);
	if (!set_cpuaffinity(1))
	/* TODO: test that choice alternates with previous */
	ret \|= test_datapath(PACKET_FANOUT_CPU, port_off,
	expect_cpu1[0], expect_cpu1[1]);

	if (ret)
	return 1;

	printf("OK. All tests passed\n");
	return 0;
	}