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- net
- psock_fanout.c
/*
* 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
*
* 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/filter.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 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) {
fprintf(stderr, "packetsock ring mmap\n");
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];
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);
}
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(fds_udp[1], 5);
ret = sock_fanout_read(fds, rings, expect1);
/* Send more data, overflow the queue */
pair_udp_send(fds_udp[0], 15);
/* 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] = { { 20, 0 }, { 20, 15 } };
const int expect_cpu0[2][2] = { { 20, 0 }, { 20, 0 } };
const int expect_cpu1[2][2] = { { 0, 20 }, { 0, 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]);
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;
}