// SPDX-License-Identifier: GPL-2.0
/* Copyright Amazon.com Inc. or its affiliates. */
#define _GNU_SOURCE
#include <sched.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/sysinfo.h>
#include "../kselftest_harness.h"
FIXTURE(so_incoming_cpu)
{
int *servers;
union {
struct sockaddr addr;
struct sockaddr_in in_addr;
};
socklen_t addrlen;
};
enum when_to_set {
BEFORE_REUSEPORT,
BEFORE_LISTEN,
AFTER_LISTEN,
AFTER_ALL_LISTEN,
};
FIXTURE_VARIANT(so_incoming_cpu)
{
int when_to_set;
};
FIXTURE_VARIANT_ADD(so_incoming_cpu, before_reuseport)
{
.when_to_set = BEFORE_REUSEPORT,
};
FIXTURE_VARIANT_ADD(so_incoming_cpu, before_listen)
{
.when_to_set = BEFORE_LISTEN,
};
FIXTURE_VARIANT_ADD(so_incoming_cpu, after_listen)
{
.when_to_set = AFTER_LISTEN,
};
FIXTURE_VARIANT_ADD(so_incoming_cpu, after_all_listen)
{
.when_to_set = AFTER_ALL_LISTEN,
};
static void write_sysctl(struct __test_metadata *_metadata,
char *filename, char *string)
{
int fd, len, ret;
fd = open(filename, O_WRONLY);
ASSERT_NE(fd, -1);
len = strlen(string);
ret = write(fd, string, len);
ASSERT_EQ(ret, len);
}
static void setup_netns(struct __test_metadata *_metadata)
{
ASSERT_EQ(unshare(CLONE_NEWNET), 0);
ASSERT_EQ(system("ip link set lo up"), 0);
write_sysctl(_metadata, "/proc/sys/net/ipv4/ip_local_port_range", "10000 60001");
write_sysctl(_metadata, "/proc/sys/net/ipv4/tcp_tw_reuse", "0");
}
#define NR_PORT (60001 - 10000 - 1)
#define NR_CLIENT_PER_SERVER_DEFAULT 32
static int nr_client_per_server, nr_server, nr_client;
FIXTURE_SETUP(so_incoming_cpu)
{
setup_netns(_metadata);
nr_server = get_nprocs();
ASSERT_LE(2, nr_server);
if (NR_CLIENT_PER_SERVER_DEFAULT * nr_server < NR_PORT)
nr_client_per_server = NR_CLIENT_PER_SERVER_DEFAULT;
else
nr_client_per_server = NR_PORT / nr_server;
nr_client = nr_client_per_server * nr_server;
self->servers = malloc(sizeof(int) * nr_server);
ASSERT_NE(self->servers, NULL);
self->in_addr.sin_family = AF_INET;
self->in_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
self->in_addr.sin_port = htons(0);
self->addrlen = sizeof(struct sockaddr_in);
}
FIXTURE_TEARDOWN(so_incoming_cpu)
{
int i;
for (i = 0; i < nr_server; i++)
close(self->servers[i]);
free(self->servers);
}
void set_so_incoming_cpu(struct __test_metadata *_metadata, int fd, int cpu)
{
int ret;
ret = setsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, &cpu, sizeof(int));
ASSERT_EQ(ret, 0);
}
int create_server(struct __test_metadata *_metadata,
FIXTURE_DATA(so_incoming_cpu) *self,
const FIXTURE_VARIANT(so_incoming_cpu) *variant,
int cpu)
{
int fd, ret;
fd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
ASSERT_NE(fd, -1);
if (variant->when_to_set == BEFORE_REUSEPORT)
set_so_incoming_cpu(_metadata, fd, cpu);
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &(int){1}, sizeof(int));
ASSERT_EQ(ret, 0);
ret = bind(fd, &self->addr, self->addrlen);
ASSERT_EQ(ret, 0);
if (variant->when_to_set == BEFORE_LISTEN)
set_so_incoming_cpu(_metadata, fd, cpu);
/* We don't use nr_client_per_server here not to block
* this test at connect() if SO_INCOMING_CPU is broken.
*/
ret = listen(fd, nr_client);
ASSERT_EQ(ret, 0);
if (variant->when_to_set == AFTER_LISTEN)
set_so_incoming_cpu(_metadata, fd, cpu);
return fd;
}
void create_servers(struct __test_metadata *_metadata,
FIXTURE_DATA(so_incoming_cpu) *self,
const FIXTURE_VARIANT(so_incoming_cpu) *variant)
{
int i, ret;
for (i = 0; i < nr_server; i++) {
self->servers[i] = create_server(_metadata, self, variant, i);
if (i == 0) {
ret = getsockname(self->servers[i], &self->addr, &self->addrlen);
ASSERT_EQ(ret, 0);
}
}
if (variant->when_to_set == AFTER_ALL_LISTEN) {
for (i = 0; i < nr_server; i++)
set_so_incoming_cpu(_metadata, self->servers[i], i);
}
}
void create_clients(struct __test_metadata *_metadata,
FIXTURE_DATA(so_incoming_cpu) *self)
{
cpu_set_t cpu_set;
int i, j, fd, ret;
for (i = 0; i < nr_server; i++) {
CPU_ZERO(&cpu_set);
CPU_SET(i, &cpu_set);
ASSERT_EQ(CPU_COUNT(&cpu_set), 1);
ASSERT_NE(CPU_ISSET(i, &cpu_set), 0);
/* Make sure SYN will be processed on the i-th CPU
* and finally distributed to the i-th listener.
*/
ret = sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
ASSERT_EQ(ret, 0);
for (j = 0; j < nr_client_per_server; j++) {
fd = socket(AF_INET, SOCK_STREAM, 0);
ASSERT_NE(fd, -1);
ret = connect(fd, &self->addr, self->addrlen);
ASSERT_EQ(ret, 0);
close(fd);
}
}
}
void verify_incoming_cpu(struct __test_metadata *_metadata,
FIXTURE_DATA(so_incoming_cpu) *self)
{
int i, j, fd, cpu, ret, total = 0;
socklen_t len = sizeof(int);
for (i = 0; i < nr_server; i++) {
for (j = 0; j < nr_client_per_server; j++) {
/* If we see -EAGAIN here, SO_INCOMING_CPU is broken */
fd = accept(self->servers[i], &self->addr, &self->addrlen);
ASSERT_NE(fd, -1);
ret = getsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, &cpu, &len);
ASSERT_EQ(ret, 0);
ASSERT_EQ(cpu, i);
close(fd);
total++;
}
}
ASSERT_EQ(total, nr_client);
TH_LOG("SO_INCOMING_CPU is very likely to be "
"working correctly with %d sockets.", total);
}
TEST_F(so_incoming_cpu, test1)
{
create_servers(_metadata, self, variant);
create_clients(_metadata, self);
verify_incoming_cpu(_metadata, self);
}
TEST_F(so_incoming_cpu, test2)
{
int server;
create_servers(_metadata, self, variant);
/* No CPU specified */
server = create_server(_metadata, self, variant, -1);
close(server);
create_clients(_metadata, self);
verify_incoming_cpu(_metadata, self);
}
TEST_F(so_incoming_cpu, test3)
{
int server, client;
create_servers(_metadata, self, variant);
/* No CPU specified */
server = create_server(_metadata, self, variant, -1);
create_clients(_metadata, self);
/* Never receive any requests */
client = accept(server, &self->addr, &self->addrlen);
ASSERT_EQ(client, -1);
verify_incoming_cpu(_metadata, self);
}
TEST_HARNESS_MAIN
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