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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <linux/err.h>
#include <test_progs.h>
#include "bpf_dctcp.skel.h"
#define min(a, b) ((a) < (b) ? (a) : (b))
static const unsigned int total_bytes = 10 * 1024 * 1024;
static const struct timeval timeo_sec = { .tv_sec = 10 };
static const size_t timeo_optlen = sizeof(timeo_sec);
static int stop, duration;
static int settimeo(int fd)
{
int err;
err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeo_sec,
timeo_optlen);
if (CHECK(err == -1, "setsockopt(fd, SO_RCVTIMEO)", "errno:%d\n",
errno))
return -1;
err = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo_sec,
timeo_optlen);
if (CHECK(err == -1, "setsockopt(fd, SO_SNDTIMEO)", "errno:%d\n",
errno))
return -1;
return 0;
}
static int settcpca(int fd, const char *tcp_ca)
{
int err;
err = setsockopt(fd, IPPROTO_TCP, TCP_CONGESTION, tcp_ca, strlen(tcp_ca));
if (CHECK(err == -1, "setsockopt(fd, TCP_CONGESTION)", "errno:%d\n",
errno))
return -1;
return 0;
}
static void *server(void *arg)
{
int lfd = (int)(long)arg, err = 0, fd;
ssize_t nr_sent = 0, bytes = 0;
char batch[1500];
fd = accept(lfd, NULL, NULL);
while (fd == -1) {
if (errno == EINTR)
continue;
err = -errno;
goto done;
}
if (settimeo(fd)) {
err = -errno;
goto done;
}
while (bytes < total_bytes && !READ_ONCE(stop)) {
nr_sent = send(fd, &batch,
min(total_bytes - bytes, sizeof(batch)), 0);
if (nr_sent == -1 && errno == EINTR)
continue;
if (nr_sent == -1) {
err = -errno;
break;
}
bytes += nr_sent;
}
CHECK(bytes != total_bytes, "send", "%zd != %u nr_sent:%zd errno:%d\n",
bytes, total_bytes, nr_sent, errno);
done:
if (fd != -1)
close(fd);
if (err) {
WRITE_ONCE(stop, 1);
return ERR_PTR(err);
}
return NULL;
}
static void do_test(const char *tcp_ca)
{
struct sockaddr_in6 sa6 = {};
ssize_t nr_recv = 0, bytes = 0;
int lfd = -1, fd = -1;
pthread_t srv_thread;
socklen_t addrlen = sizeof(sa6);
void *thread_ret;
char batch[1500];
int err;
WRITE_ONCE(stop, 0);
lfd = socket(AF_INET6, SOCK_STREAM, 0);
if (CHECK(lfd == -1, "socket", "errno:%d\n", errno))
return;
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (CHECK(fd == -1, "socket", "errno:%d\n", errno)) {
close(lfd);
return;
}
if (settcpca(lfd, tcp_ca) || settcpca(fd, tcp_ca) ||
settimeo(lfd) || settimeo(fd))
goto done;
/* bind, listen and start server thread to accept */
sa6.sin6_family = AF_INET6;
sa6.sin6_addr = in6addr_loopback;
err = bind(lfd, (struct sockaddr *)&sa6, addrlen);
if (CHECK(err == -1, "bind", "errno:%d\n", errno))
goto done;
err = getsockname(lfd, (struct sockaddr *)&sa6, &addrlen);
if (CHECK(err == -1, "getsockname", "errno:%d\n", errno))
goto done;
err = listen(lfd, 1);
if (CHECK(err == -1, "listen", "errno:%d\n", errno))
goto done;
err = pthread_create(&srv_thread, NULL, server, (void *)(long)lfd);
if (CHECK(err != 0, "pthread_create", "err:%d\n", err))
goto done;
/* connect to server */
err = connect(fd, (struct sockaddr *)&sa6, addrlen);
if (CHECK(err == -1, "connect", "errno:%d\n", errno))
goto wait_thread;
/* recv total_bytes */
while (bytes < total_bytes && !READ_ONCE(stop)) {
nr_recv = recv(fd, &batch,
min(total_bytes - bytes, sizeof(batch)), 0);
if (nr_recv == -1 && errno == EINTR)
continue;
if (nr_recv == -1)
break;
bytes += nr_recv;
}
CHECK(bytes != total_bytes, "recv", "%zd != %u nr_recv:%zd errno:%d\n",
bytes, total_bytes, nr_recv, errno);
wait_thread:
WRITE_ONCE(stop, 1);
pthread_join(srv_thread, &thread_ret);
CHECK(IS_ERR(thread_ret), "pthread_join", "thread_ret:%ld",
PTR_ERR(thread_ret));
done:
close(lfd);
close(fd);
}
static void test_dctcp(void)
{
struct bpf_dctcp *dctcp_skel;
struct bpf_link *link;
dctcp_skel = bpf_dctcp__open_and_load();
if (CHECK(!dctcp_skel, "bpf_dctcp__open_and_load", "failed\n"))
return;
link = bpf_map__attach_struct_ops(dctcp_skel->maps.dctcp);
if (CHECK(IS_ERR(link), "bpf_map__attach_struct_ops", "err:%ld\n",
PTR_ERR(link))) {
bpf_dctcp__destroy(dctcp_skel);
return;
}
do_test("bpf_dctcp");
bpf_link__destroy(link);
bpf_dctcp__destroy(dctcp_skel);
}
void test_bpf_tcp_ca(void)
{
if (test__start_subtest("dctcp"))
test_dctcp();
}
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