diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore index 3d7adee7a3e6..ff8807cc9c2e 100644 --- a/tools/testing/selftests/net/.gitignore +++ b/tools/testing/selftests/net/.gitignore @@ -25,6 +25,7 @@ rxtimestamp sk_bind_sendto_listen sk_connect_zero_addr socket +so_incoming_cpu so_netns_cookie so_txtime stress_reuseport_listen diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 69c58362c0ed..cec4800cb017 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -71,6 +71,7 @@ TEST_GEN_FILES += bind_bhash TEST_GEN_PROGS += sk_bind_sendto_listen TEST_GEN_PROGS += sk_connect_zero_addr TEST_PROGS += test_ingress_egress_chaining.sh +TEST_GEN_PROGS += so_incoming_cpu TEST_FILES := settings diff --git a/tools/testing/selftests/net/so_incoming_cpu.c b/tools/testing/selftests/net/so_incoming_cpu.c new file mode 100644 index 000000000000..0e04f9fef986 --- /dev/null +++ b/tools/testing/selftests/net/so_incoming_cpu.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright Amazon.com Inc. or its affiliates. */ +#define _GNU_SOURCE +#include + +#include +#include +#include + +#include "../kselftest_harness.h" + +#define CLIENT_PER_SERVER 32 /* More sockets, more reliable */ +#define NR_SERVER self->nproc +#define NR_CLIENT (CLIENT_PER_SERVER * NR_SERVER) + +FIXTURE(so_incoming_cpu) +{ + int nproc; + 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, +}; + +FIXTURE_SETUP(so_incoming_cpu) +{ + self->nproc = get_nprocs(); + ASSERT_LE(2, self->nproc); + + 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 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. + */ + sched_setaffinity(0, sizeof(cpu_set), &cpu_set); + ASSERT_EQ(ret, 0); + + for (j = 0; j < 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 < 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