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selftests/io_uring: test zerocopy send 

Add selftests for io_uring zerocopy sends and io_uring's notification
infrastructure. It's largely influenced by msg_zerocopy and uses it on
the receive side.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/03d5ec78061cf52db420f88ed0b48eb8f47ce9f7.1657643355.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-07-12 21:52:51 +01:00 committed by Jens Axboe
parent 3ff1a0d395
commit d8b6171bd5
3 changed files with 737 additions and 0 deletions
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1
tools/testing/selftests/net/Makefile
View File

@ -59,6 +59,7 @@ TEST_GEN_FILES += toeplitz
TEST_GEN_FILES += cmsg_sender
TEST_GEN_FILES += stress_reuseport_listen
TEST_PROGS += test_vxlan_vnifiltering.sh
TEST_GEN_FILES += io_uring_zerocopy_tx
TEST_FILES := settings

605
tools/testing/selftests/net/io_uring_zerocopy_tx.c Normal file
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@ -0,0 +1,605 @@
/* 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>
#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_flush = false;
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)));
struct io_sq_ring {
unsigned *head;
unsigned *tail;
unsigned *ring_mask;
unsigned *ring_entries;
unsigned *flags;
unsigned *array;
};
struct io_cq_ring {
unsigned *head;
unsigned *tail;
unsigned *ring_mask;
unsigned *ring_entries;
struct io_uring_cqe *cqes;
};
struct io_uring_sq {
unsigned *khead;
unsigned *ktail;
unsigned *kring_mask;
unsigned *kring_entries;
unsigned *kflags;
unsigned *kdropped;
unsigned *array;
struct io_uring_sqe *sqes;
unsigned sqe_head;
unsigned sqe_tail;
size_t ring_sz;
};
struct io_uring_cq {
unsigned *khead;
unsigned *ktail;
unsigned *kring_mask;
unsigned *kring_entries;
unsigned *koverflow;
struct io_uring_cqe *cqes;
size_t ring_sz;
};
struct io_uring {
struct io_uring_sq sq;
struct io_uring_cq cq;
int ring_fd;
};
#ifdef __alpha__
# ifndef __NR_io_uring_setup
# define __NR_io_uring_setup 535
# endif
# ifndef __NR_io_uring_enter
# define __NR_io_uring_enter 536
# endif
# ifndef __NR_io_uring_register
# define __NR_io_uring_register 537
# endif
#else /* !__alpha__ */
# ifndef __NR_io_uring_setup
# define __NR_io_uring_setup 425
# endif
# ifndef __NR_io_uring_enter
# define __NR_io_uring_enter 426
# endif
# ifndef __NR_io_uring_register
# define __NR_io_uring_register 427
# endif
#endif
#if defined(__x86_64) || defined(__i386__)
#define read_barrier() __asm__ __volatile__("":::"memory")
#define write_barrier() __asm__ __volatile__("":::"memory")
#else
#define read_barrier() __sync_synchronize()
#define write_barrier() __sync_synchronize()
#endif
static int io_uring_setup(unsigned int entries, struct io_uring_params *p)
{
return syscall(__NR_io_uring_setup, entries, p);
}
static int io_uring_enter(int fd, unsigned int to_submit,
unsigned int min_complete,
unsigned int flags, sigset_t *sig)
{
return syscall(__NR_io_uring_enter, fd, to_submit, min_complete,
flags, sig, _NSIG / 8);
}
static int io_uring_register_buffers(struct io_uring *ring,
const struct iovec *iovecs,
unsigned nr_iovecs)
{
int ret;
ret = syscall(__NR_io_uring_register, ring->ring_fd,
IORING_REGISTER_BUFFERS, iovecs, nr_iovecs);
return (ret < 0) ? -errno : ret;
}
static int io_uring_register_notifications(struct io_uring *ring,
unsigned nr,
struct io_uring_notification_slot *slots)
{
int ret;
struct io_uring_notification_register r = {
.nr_slots = nr,
.data = (unsigned long)slots,
};
ret = syscall(__NR_io_uring_register, ring->ring_fd,
IORING_REGISTER_NOTIFIERS, &r, sizeof(r));
return (ret < 0) ? -errno : ret;
}
static int io_uring_mmap(int fd, struct io_uring_params *p,
struct io_uring_sq *sq, struct io_uring_cq *cq)
{
size_t size;
void *ptr;
int ret;
sq->ring_sz = p->sq_off.array + p->sq_entries * sizeof(unsigned);
ptr = mmap(0, sq->ring_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQ_RING);
if (ptr == MAP_FAILED)
return -errno;
sq->khead = ptr + p->sq_off.head;
sq->ktail = ptr + p->sq_off.tail;
sq->kring_mask = ptr + p->sq_off.ring_mask;
sq->kring_entries = ptr + p->sq_off.ring_entries;
sq->kflags = ptr + p->sq_off.flags;
sq->kdropped = ptr + p->sq_off.dropped;
sq->array = ptr + p->sq_off.array;
size = p->sq_entries * sizeof(struct io_uring_sqe);
sq->sqes = mmap(0, size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQES);
if (sq->sqes == MAP_FAILED) {
ret = -errno;
err:
munmap(sq->khead, sq->ring_sz);
return ret;
}
cq->ring_sz = p->cq_off.cqes + p->cq_entries * sizeof(struct io_uring_cqe);
ptr = mmap(0, cq->ring_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING);
if (ptr == MAP_FAILED) {
ret = -errno;
munmap(sq->sqes, p->sq_entries * sizeof(struct io_uring_sqe));
goto err;
}
cq->khead = ptr + p->cq_off.head;
cq->ktail = ptr + p->cq_off.tail;
cq->kring_mask = ptr + p->cq_off.ring_mask;
cq->kring_entries = ptr + p->cq_off.ring_entries;
cq->koverflow = ptr + p->cq_off.overflow;
cq->cqes = ptr + p->cq_off.cqes;
return 0;
}
static int io_uring_queue_init(unsigned entries, struct io_uring *ring,
unsigned flags)
{
struct io_uring_params p;
int fd, ret;
memset(ring, 0, sizeof(*ring));
memset(&p, 0, sizeof(p));
p.flags = flags;
fd = io_uring_setup(entries, &p);
if (fd < 0)
return fd;
ret = io_uring_mmap(fd, &p, &ring->sq, &ring->cq);
if (!ret)
ring->ring_fd = fd;
else
close(fd);
return ret;
}
static int io_uring_submit(struct io_uring *ring)
{
struct io_uring_sq *sq = &ring->sq;
const unsigned mask = *sq->kring_mask;
unsigned ktail, submitted, to_submit;
int ret;
read_barrier();
if (*sq->khead != *sq->ktail) {
submitted = *sq->kring_entries;
goto submit;
}
if (sq->sqe_head == sq->sqe_tail)
return 0;
ktail = *sq->ktail;
to_submit = sq->sqe_tail - sq->sqe_head;
for (submitted = 0; submitted < to_submit; submitted++) {
read_barrier();
sq->array[ktail++ & mask] = sq->sqe_head++ & mask;
}
if (!submitted)
return 0;
if (*sq->ktail != ktail) {
write_barrier();
*sq->ktail = ktail;
write_barrier();
}
submit:
ret = io_uring_enter(ring->ring_fd, submitted, 0,
IORING_ENTER_GETEVENTS, NULL);
return ret < 0 ? -errno : ret;
}
static inline void io_uring_prep_send(struct io_uring_sqe *sqe, int sockfd,
const void *buf, size_t len, int flags)
{
memset(sqe, 0, sizeof(*sqe));
sqe->opcode = (__u8) IORING_OP_SEND;
sqe->fd = sockfd;
sqe->addr = (unsigned long) buf;
sqe->len = len;
sqe->msg_flags = (__u32) flags;
}
static inline void io_uring_prep_sendzc(struct io_uring_sqe *sqe, int sockfd,
const void *buf, size_t len, int flags,
unsigned slot_idx, unsigned zc_flags)
{
io_uring_prep_send(sqe, sockfd, buf, len, flags);
sqe->opcode = (__u8) IORING_OP_SENDZC_NOTIF;
sqe->notification_idx = slot_idx;
sqe->ioprio = zc_flags;
}
static struct io_uring_sqe *io_uring_get_sqe(struct io_uring *ring)
{
struct io_uring_sq *sq = &ring->sq;
if (sq->sqe_tail + 1 - sq->sqe_head > *sq->kring_entries)
return NULL;
return &sq->sqes[sq->sqe_tail++ & *sq->kring_mask];
}
static int io_uring_wait_cqe(struct io_uring *ring, struct io_uring_cqe **cqe_ptr)
{
struct io_uring_cq *cq = &ring->cq;
const unsigned mask = *cq->kring_mask;
unsigned head = *cq->khead;
int ret;
*cqe_ptr = NULL;
do {
read_barrier();
if (head != *cq->ktail) {
*cqe_ptr = &cq->cqes[head & mask];
break;
}
ret = io_uring_enter(ring->ring_fd, 0, 1,
IORING_ENTER_GETEVENTS, NULL);
if (ret < 0)
return -errno;
} while (1);
return 0;
}
static inline void io_uring_cqe_seen(struct io_uring *ring)
{
*(&ring->cq)->khead += 1;
write_barrier();
}
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_notification_slot b[1] = {{.tag = NOTIF_TAG}};
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");
ret = io_uring_register_notifications(&ring, 1, b);
if (ret)
error(1, ret, "io_uring: tx ctx registration");
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 slot_idx = 0;
unsigned mode = cfg_mode;
unsigned msg_flags = 0;
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 {
if (cfg_flush) {
zc_flags |= IORING_RECVSEND_NOTIF_FLUSH;
compl_cqes++;
}
io_uring_prep_sendzc(sqe, fd, payload,
cfg_payload_len,
msg_flags, slot_idx, 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");
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 == NOTIF_TAG) {
compl_cqes--;
i--;
} else if (cqe->user_data != NONZC_TAG &&
cqe->user_data != ZC_TAG) {
error(1, cqe->res, "invalid user_data");
} else if (cqe->res <= 0 && cqe->res != -EAGAIN) {
error(1, cqe->res, "send failed");
} else {
if (cqe->res > 0) {
packets++;
bytes += cqe->res;
}
/* failed requests don't flush */
if (cfg_flush &&
cqe->res <= 0 &&
cqe->user_data == ZC_TAG)
compl_cqes--;
}
io_uring_cqe_seen(&ring);
}
if (cfg_cork)
do_setsockopt(fd, IPPROTO_UDP, UDP_CORK, 0);
} while (gettimeofday_ms() < tstop);
if (close(fd))
error(1, errno, "close");
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));
while (compl_cqes) {
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret)
error(1, ret, "wait cqe");
io_uring_cqe_seen(&ring);
compl_cqes--;
}
}
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 [-f] [-n<N>] [-z0] [-s<payload size>] "
"(-4|-6) [-t<time s>] -D<dst_ip> udp", 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:fc: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 'f':
cfg_flush = 1;
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 (cfg_mode == MODE_NONZC && cfg_flush)
error(1, 0, "-f: only zerocopy modes support notifications");
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;
}

131
tools/testing/selftests/net/io_uring_zerocopy_tx.sh Executable file
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@ -0,0 +1,131 @@
#!/bin/bash
#
# Send data between two processes across namespaces
# Run twice: once without and once with zerocopy
set -e
readonly DEV="veth0"
readonly DEV_MTU=65535
readonly BIN_TX="./io_uring_zerocopy_tx"
readonly BIN_RX="./msg_zerocopy"
readonly RAND="$(mktemp -u XXXXXX)"
readonly NSPREFIX="ns-${RAND}"
readonly NS1="${NSPREFIX}1"
readonly NS2="${NSPREFIX}2"
readonly SADDR4='192.168.1.1'
readonly DADDR4='192.168.1.2'
readonly SADDR6='fd::1'
readonly DADDR6='fd::2'
readonly path_sysctl_mem="net.core.optmem_max"
# No arguments: automated test
if [[ "$#" -eq "0" ]]; then
IPs=( "4" "6" )
protocols=( "tcp" "udp" )
for IP in "${IPs[@]}"; do
for proto in "${protocols[@]}"; do
for mode in $(seq 1 3); do
$0 "$IP" "$proto" -m "$mode" -t 1 -n 32
$0 "$IP" "$proto" -m "$mode" -t 1 -n 32 -f
$0 "$IP" "$proto" -m "$mode" -t 1 -n 32 -c -f
done
done
done
echo "OK. All tests passed"
exit 0
fi
# Argument parsing
if [[ "$#" -lt "2" ]]; then
echo "Usage: $0 [4|6] [tcp|udp|raw|raw_hdrincl|packet|packet_dgram] <args>"
exit 1
fi
readonly IP="$1"
shift
readonly TXMODE="$1"
shift
readonly EXTRA_ARGS="$@"
# Argument parsing: configure addresses
if [[ "${IP}" == "4" ]]; then
readonly SADDR="${SADDR4}"
readonly DADDR="${DADDR4}"
elif [[ "${IP}" == "6" ]]; then
readonly SADDR="${SADDR6}"
readonly DADDR="${DADDR6}"
else
echo "Invalid IP version ${IP}"
exit 1
fi
# Argument parsing: select receive mode
#
# This differs from send mode for
# - packet: use raw recv, because packet receives skb clones
# - raw_hdrinc: use raw recv, because hdrincl is a tx-only option
case "${TXMODE}" in
'packet' | 'packet_dgram' | 'raw_hdrincl')
RXMODE='raw'
;;
*)
RXMODE="${TXMODE}"
;;
esac
# Start of state changes: install cleanup handler
save_sysctl_mem="$(sysctl -n ${path_sysctl_mem})"
cleanup() {
ip netns del "${NS2}"
ip netns del "${NS1}"
sysctl -w -q "${path_sysctl_mem}=${save_sysctl_mem}"
}
trap cleanup EXIT
# Configure system settings
sysctl -w -q "${path_sysctl_mem}=1000000"
# Create virtual ethernet pair between network namespaces
ip netns add "${NS1}"
ip netns add "${NS2}"
ip link add "${DEV}" mtu "${DEV_MTU}" netns "${NS1}" type veth \
peer name "${DEV}" mtu "${DEV_MTU}" netns "${NS2}"
# Bring the devices up
ip -netns "${NS1}" link set "${DEV}" up
ip -netns "${NS2}" link set "${DEV}" up
# Set fixed MAC addresses on the devices
ip -netns "${NS1}" link set dev "${DEV}" address 02:02:02:02:02:02
ip -netns "${NS2}" link set dev "${DEV}" address 06:06:06:06:06:06
# Add fixed IP addresses to the devices
ip -netns "${NS1}" addr add 192.168.1.1/24 dev "${DEV}"
ip -netns "${NS2}" addr add 192.168.1.2/24 dev "${DEV}"
ip -netns "${NS1}" addr add fd::1/64 dev "${DEV}" nodad
ip -netns "${NS2}" addr add fd::2/64 dev "${DEV}" nodad
# Optionally disable sg or csum offload to test edge cases
# ip netns exec "${NS1}" ethtool -K "${DEV}" sg off
do_test() {
local readonly ARGS="$1"
echo "ipv${IP} ${TXMODE} ${ARGS}"
ip netns exec "${NS2}" "${BIN_RX}" "-${IP}" -t 2 -C 2 -S "${SADDR}" -D "${DADDR}" -r "${RXMODE}" &
sleep 0.2
ip netns exec "${NS1}" "${BIN_TX}" "-${IP}" -t 1 -D "${DADDR}" ${ARGS} "${TXMODE}"
wait
}
do_test "${EXTRA_ARGS}"
echo ok