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linux/tools/testing/selftests/net/io_uring_zerocopy_tx.c
Breno Leitao ba6e0e5cb5 selftests/net: Extract uring helpers to be reusable 
Instead of defining basic io_uring functions in the test case, move them
to a common directory, so, other tests can use them.

This simplify the test code and reuse the common liburing
infrastructure. This is basically a copy of what we have in
io_uring_zerocopy_tx with some minor improvements to make checkpatch
happy.

A follow-up test will use the same helpers in a BPF sockopt test.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20231016134750.1381153-8-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-10-19 16:42:03 -06:00

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/* SPDX-License-Identifier: MIT */
/* based on linux-kernel/tools/testing/selftests/net/msg_zerocopy.c */
#include <assert.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <linux/errqueue.h>
#include <linux/if_packet.h>
#include <linux/io_uring.h>
#include <linux/ipv6.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <io_uring/mini_liburing.h>
#define NOTIF_TAG 0xfffffffULL
#define NONZC_TAG 0
#define ZC_TAG 1
enum {
MODE_NONZC = 0,
MODE_ZC = 1,
MODE_ZC_FIXED = 2,
MODE_MIXED = 3,
};
static bool cfg_cork = false;
static int cfg_mode = MODE_ZC_FIXED;
static int cfg_nr_reqs = 8;
static int cfg_family = PF_UNSPEC;
static int cfg_payload_len;
static int cfg_port = 8000;
static int cfg_runtime_ms = 4200;
static socklen_t cfg_alen;
static struct sockaddr_storage cfg_dst_addr;
static char payload[IP_MAXPACKET] __attribute__((aligned(4096)));
static unsigned long gettimeofday_ms(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
}
static void do_setsockopt(int fd, int level, int optname, int val)
{
if (setsockopt(fd, level, optname, &val, sizeof(val)))
error(1, errno, "setsockopt %d.%d: %d", level, optname, val);
}
static int do_setup_tx(int domain, int type, int protocol)
{
int fd;
fd = socket(domain, type, protocol);
if (fd == -1)
error(1, errno, "socket t");
do_setsockopt(fd, SOL_SOCKET, SO_SNDBUF, 1 << 21);
if (connect(fd, (void *) &cfg_dst_addr, cfg_alen))
error(1, errno, "connect");
return fd;
}
static void do_tx(int domain, int type, int protocol)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
unsigned long packets = 0, bytes = 0;
struct io_uring ring;
struct iovec iov;
uint64_t tstop;
int i, fd, ret;
int compl_cqes = 0;
fd = do_setup_tx(domain, type, protocol);
ret = io_uring_queue_init(512, &ring, 0);
if (ret)
error(1, ret, "io_uring: queue init");
iov.iov_base = payload;
iov.iov_len = cfg_payload_len;
ret = io_uring_register_buffers(&ring, &iov, 1);
if (ret)
error(1, ret, "io_uring: buffer registration");
tstop = gettimeofday_ms() + cfg_runtime_ms;
do {
if (cfg_cork)
do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 1);
for (i = 0; i < cfg_nr_reqs; i++) {
unsigned zc_flags = 0;
unsigned buf_idx = 0;
unsigned mode = cfg_mode;
unsigned msg_flags = MSG_WAITALL;
if (cfg_mode == MODE_MIXED)
mode = rand() % 3;
sqe = io_uring_get_sqe(&ring);
if (mode == MODE_NONZC) {
io_uring_prep_send(sqe, fd, payload,
cfg_payload_len, msg_flags);
sqe->user_data = NONZC_TAG;
} else {
io_uring_prep_sendzc(sqe, fd, payload,
cfg_payload_len,
msg_flags, zc_flags);
if (mode == MODE_ZC_FIXED) {
sqe->ioprio |= IORING_RECVSEND_FIXED_BUF;
sqe->buf_index = buf_idx;
}
sqe->user_data = ZC_TAG;
}
}
ret = io_uring_submit(&ring);
if (ret != cfg_nr_reqs)
error(1, ret, "submit");
if (cfg_cork)
do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 0);
for (i = 0; i < cfg_nr_reqs; i++) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret)
error(1, ret, "wait cqe");
if (cqe->user_data != NONZC_TAG &&
cqe->user_data != ZC_TAG)
error(1, -EINVAL, "invalid cqe->user_data");
if (cqe->flags & IORING_CQE_F_NOTIF) {
if (cqe->flags & IORING_CQE_F_MORE)
error(1, -EINVAL, "invalid notif flags");
if (compl_cqes <= 0)
error(1, -EINVAL, "notification mismatch");
compl_cqes--;
i--;
io_uring_cqe_seen(&ring);
continue;
}
if (cqe->flags & IORING_CQE_F_MORE) {
if (cqe->user_data != ZC_TAG)
error(1, cqe->res, "unexpected F_MORE");
compl_cqes++;
}
if (cqe->res >= 0) {
packets++;
bytes += cqe->res;
} else if (cqe->res != -EAGAIN) {
error(1, cqe->res, "send failed");
}
io_uring_cqe_seen(&ring);
}
} while (gettimeofday_ms() < tstop);
while (compl_cqes) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret)
error(1, ret, "wait cqe");
if (cqe->flags & IORING_CQE_F_MORE)
error(1, -EINVAL, "invalid notif flags");
if (!(cqe->flags & IORING_CQE_F_NOTIF))
error(1, -EINVAL, "missing notif flag");
io_uring_cqe_seen(&ring);
compl_cqes--;
}
fprintf(stderr, "tx=%lu (MB=%lu), tx/s=%lu (MB/s=%lu)\n",
packets, bytes >> 20,
packets / (cfg_runtime_ms / 1000),
(bytes >> 20) / (cfg_runtime_ms / 1000));
if (close(fd))
error(1, errno, "close");
}
static void do_test(int domain, int type, int protocol)
{
int i;
for (i = 0; i < IP_MAXPACKET; i++)
payload[i] = 'a' + (i % 26);
do_tx(domain, type, protocol);
}
static void usage(const char *filepath)
{
error(1, 0, "Usage: %s (-4|-6) (udp|tcp) -D<dst_ip> [-s<payload size>] "
"[-t<time s>] [-n<batch>] [-p<port>] [-m<mode>]", filepath);
}
static void parse_opts(int argc, char **argv)
{
const int max_payload_len = sizeof(payload) -
sizeof(struct ipv6hdr) -
sizeof(struct tcphdr) -
40 /* max tcp options */;
struct sockaddr_in6 *addr6 = (void *) &cfg_dst_addr;
struct sockaddr_in *addr4 = (void *) &cfg_dst_addr;
char *daddr = NULL;
int c;
if (argc <= 1)
usage(argv[0]);
cfg_payload_len = max_payload_len;
while ((c = getopt(argc, argv, "46D:p:s:t:n:c:m:")) != -1) {
switch (c) {
case '4':
if (cfg_family != PF_UNSPEC)
error(1, 0, "Pass one of -4 or -6");
cfg_family = PF_INET;
cfg_alen = sizeof(struct sockaddr_in);
break;
case '6':
if (cfg_family != PF_UNSPEC)
error(1, 0, "Pass one of -4 or -6");
cfg_family = PF_INET6;
cfg_alen = sizeof(struct sockaddr_in6);
break;
case 'D':
daddr = optarg;
break;
case 'p':
cfg_port = strtoul(optarg, NULL, 0);
break;
case 's':
cfg_payload_len = strtoul(optarg, NULL, 0);
break;
case 't':
cfg_runtime_ms = 200 + strtoul(optarg, NULL, 10) * 1000;
break;
case 'n':
cfg_nr_reqs = strtoul(optarg, NULL, 0);
break;
case 'c':
cfg_cork = strtol(optarg, NULL, 0);
break;
case 'm':
cfg_mode = strtol(optarg, NULL, 0);
break;
}
}
switch (cfg_family) {
case PF_INET:
memset(addr4, 0, sizeof(*addr4));
addr4->sin_family = AF_INET;
addr4->sin_port = htons(cfg_port);
if (daddr &&
inet_pton(AF_INET, daddr, &(addr4->sin_addr)) != 1)
error(1, 0, "ipv4 parse error: %s", daddr);
break;
case PF_INET6:
memset(addr6, 0, sizeof(*addr6));
addr6->sin6_family = AF_INET6;
addr6->sin6_port = htons(cfg_port);
if (daddr &&
inet_pton(AF_INET6, daddr, &(addr6->sin6_addr)) != 1)
error(1, 0, "ipv6 parse error: %s", daddr);
break;
default:
error(1, 0, "illegal domain");
}
if (cfg_payload_len > max_payload_len)
error(1, 0, "-s: payload exceeds max (%d)", max_payload_len);
if (optind != argc - 1)
usage(argv[0]);
}
int main(int argc, char **argv)
{
const char *cfg_test = argv[argc - 1];
parse_opts(argc, argv);
if (!strcmp(cfg_test, "tcp"))
do_test(cfg_family, SOCK_STREAM, 0);
else if (!strcmp(cfg_test, "udp"))
do_test(cfg_family, SOCK_DGRAM, 0);
else
error(1, 0, "unknown cfg_test %s", cfg_test);
return 0;
}
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