test/zcrx.c - master - githubmirror/liburing

test/zcrx.c
928 строк20 KB
Haiyue Wang
test/zcrx: use uring_ptr_to_u64() helper to convert ptr to u64
18 июн 2025, 19:02
18 июн 2025, 19:02c2b3a10
/* SPDX-License-Identifier: MIT */
/*
 * Simple test case showing using send and recv through io_uring
 */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <pthread.h>
#include <net/if.h>

#include "liburing.h"
#include "helpers.h"

static unsigned int ifidx, rxq;

static long page_size;

/* the hw rxq must consume 128 of these pages, leaving 4 left */
#define AREA_PAGES	132
#define AREA_SZ		(AREA_PAGES * page_size)
#define RQ_ENTRIES	128
/* this is one more than the # of free pages after filling hw rxq */
#define LOOP_COUNT	5
#define DEV_ENV_VAR	"NETIF"
#define RXQ_ENV_VAR	"NETRXQ"
#define RING_FLAGS	(IORING_SETUP_DEFER_TASKRUN | \
			 IORING_SETUP_CQE32 | \
			 IORING_SETUP_SINGLE_ISSUER)

static char str[] = "iv5t4dl500w7wsrf14fsuq8thptto0z7i2q62z1p8dwrv5u4kaxpqhm2rb7bapddi5gfkh7f9695eh46t2o5yap2y43gstbsq3n90bg1i7zx1m4wojoqbuxhsrw4s4y3sh9qp57ovbaa2o9yaqa7d4to2vak1otvgkoxs5t0ovjbe6roginrjeh906kmjn1289jlho9a1bud02ex4xr3cvfcybpl6axnr117p0aesb3070wlvj91en7tpf8nyb1e";

#define MSG_SIZE 512

#define PORT	10202
#define HOST	"127.0.0.1"

static int probe_zcrx(void *area)
{
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area),
		.len = AREA_SZ,
		.flags = 0,
	};
	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};
	struct io_uring ring;
	int ret;

	ret = t_create_ring(8, &ring, RING_FLAGS);
	if (ret == T_SETUP_SKIP) {
		fprintf(stderr, "required ring flags are not supported, skip\n");
		return T_EXIT_SKIP;
	}
	if (ret) {
		fprintf(stderr, "probe ring setup failure\n");
		return T_EXIT_FAIL;
	}

	ret = io_uring_register_ifq(&ring, &reg);
	if (ret == -EINVAL) {
		fprintf(stderr, "zcrx is not supported, skip\n");
		return T_EXIT_SKIP;
	}
	if (ret) {
		fprintf(stderr, "probe zcrx register fail %i\n", ret);
		return T_EXIT_FAIL;
	}
	io_uring_queue_exit(&ring);
	return T_EXIT_PASS;
}

static int try_register_ifq(struct io_uring_zcrx_ifq_reg *reg)
{
	struct io_uring ring;
	int ret;

	ret = t_create_ring(8, &ring, RING_FLAGS);
	if (ret != T_SETUP_OK) {
		fprintf(stderr, "ring create failed: %d\n", ret);
		exit(T_EXIT_FAIL);
	}

	ret = io_uring_register_ifq(&ring, reg);
	io_uring_queue_exit(&ring);
	return ret;
}

static int test_invalid_if(void *area)
{
	int ret;
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area),
		.len = AREA_SZ,
		.flags = 0,
	};
	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = -1,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};

	ret = try_register_ifq(&reg);
	if (ret != -EINVAL && ret != -ENODEV) {
		fprintf(stderr, "registered invalid IF %i\n", ret);
		return T_EXIT_FAIL;
	}

	reg.if_idx = ifidx;
	reg.if_rxq = -1;

	ret = try_register_ifq(&reg);
	if (ret != -EINVAL) {
		fprintf(stderr, "registered invalid IFQ %i\n", ret);
		return T_EXIT_FAIL;
	}
	return T_EXIT_PASS;
}

static int test_invalid_ifq_collision(void *area)
{
	struct io_uring ring, ring2;
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area),
		.len = AREA_SZ,
		.flags = 0,
	};
	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};
	int ret;

	ret = t_create_ring(8, &ring, RING_FLAGS);
	if (ret != T_SETUP_OK) {
		fprintf(stderr, "ring create failed: %d\n", ret);
		return T_EXIT_FAIL;
	}
	ret = t_create_ring(8, &ring2, RING_FLAGS);
	if (ret != T_SETUP_OK) {
		fprintf(stderr, "ring2 create failed: %d\n", ret);
		return T_EXIT_FAIL;
	}

	ret = io_uring_register_ifq(&ring, &reg);
	if (ret) {
		fprintf(stderr, "initial registration failed %i\n", ret);
		return T_EXIT_FAIL;
	}

	/* register taken ifq */
	ret = io_uring_register_ifq(&ring, &reg);
	if (!ret) {
		fprintf(stderr, "registered taken queue\n");
		return T_EXIT_FAIL;
	}

	ret = io_uring_register_ifq(&ring2, &reg);
	if (!ret) {
		fprintf(stderr, "registered taken queue ring2\n");
		return T_EXIT_FAIL;
	}

	io_uring_queue_exit(&ring);
	io_uring_queue_exit(&ring2);
	return T_EXIT_PASS;
}

static int test_rq_setup(void *area)
{
	int ret;
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area),
		.len = AREA_SZ,
		.flags = 0,
	};

	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = 0,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};

	ret = try_register_ifq(&reg);
	if (ret != -EINVAL) {
		fprintf(stderr, "registered 0 rq entries\n");
		return T_EXIT_FAIL;
	}

	reg.rq_entries = (__u32)-1;

	ret = try_register_ifq(&reg);
	if (ret != -EINVAL) {
		fprintf(stderr, "registered unlimited nr of rq entries\n");
		return T_EXIT_FAIL;
	}

	reg.rq_entries = RQ_ENTRIES - 1;
	ret = try_register_ifq(&reg);
	if (ret != 0) {
		fprintf(stderr, "ifq registration failed %i\n", ret);
		return T_EXIT_FAIL;
	}

	if (reg.rq_entries == RQ_ENTRIES - 1) {
		fprintf(stderr, "registered non pow2 refill entries %i\n",
			reg.rq_entries);
		return T_EXIT_FAIL;
	}

	return T_EXIT_PASS;
}

static int test_null_area_reg_struct(void)
{
	int ret;

	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(0),
	};

	ret = try_register_ifq(&reg);
	return ret ? T_EXIT_PASS : T_EXIT_FAIL;
}

static int test_null_area(void)
{
	int ret;

	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(0),
		.len = AREA_SZ,
		.flags = 0,
	};

	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};

	ret = try_register_ifq(&reg);
	return ret ? T_EXIT_PASS : T_EXIT_FAIL;
}

static int test_misaligned_area(void *area)
{
	int ret;
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area + 1),
		.len = AREA_SZ,
		.flags = 0,
	};

	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};

	if (!try_register_ifq(&reg))
		return T_EXIT_FAIL;

	area_reg.addr = uring_ptr_to_u64(area);
	area_reg.len = AREA_SZ - 1;
	ret = try_register_ifq(&reg);
	return ret ? T_EXIT_PASS : T_EXIT_FAIL;
}

static int test_larger_than_alloc_area(void *area)
{
	int ret;
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area),
		.len = AREA_SZ + 4096,
		.flags = 0,
	};

	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};

	ret = try_register_ifq(&reg);
	return ret ? T_EXIT_PASS : T_EXIT_FAIL;
}

static int test_area_access(void)
{
	struct io_uring_zcrx_area_reg area_reg = {
		.len = AREA_SZ,
		.flags = 0,
	};
	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};
	int i, ret;
	void *area;

	for (i = 0; i < 2; i++) {
		int ro = i & 1;
		int prot = ro ? PROT_READ : PROT_WRITE;

		area = mmap(NULL, AREA_SZ, prot,
			    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
		if (area == MAP_FAILED) {
			perror("mmap");
			return T_EXIT_FAIL;
		}

		area_reg.addr = uring_ptr_to_u64(area);

		ret = try_register_ifq(&reg);
		if (ret != -EFAULT) {
			fprintf(stderr, "registered unaccessible memory\n");
			return T_EXIT_FAIL;
		}

		munmap(area, AREA_SZ);
	}

	return T_EXIT_PASS;
}

static int create_ring_with_ifq(struct io_uring *ring, void *area, __u32 *id)
{
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(area),
		.len = AREA_SZ,
		.flags = 0,
	};
	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};
	int ret;

	ret = t_create_ring(128, ring, RING_FLAGS);
	if (ret != T_SETUP_OK) {
		fprintf(stderr, "ring create failed: %d\n", ret);
		return T_EXIT_FAIL;
	}

	ret = io_uring_register_ifq(ring, &reg);
	if (ret) {
		io_uring_queue_exit(ring);
		fprintf(stderr, "ifq register failed %d\n", ret);
		return T_EXIT_FAIL;
	}
	*id = reg.zcrx_id;
	return 0;
}

static void test_io_uring_prep_zcrx(struct io_uring_sqe *sqe, int fd, int ifq)
{
	io_uring_prep_rw(IORING_OP_RECV_ZC, sqe, fd, NULL, 0, 0);
	sqe->zcrx_ifq_idx = ifq;
	sqe->ioprio |= IORING_RECV_MULTISHOT;
}

static struct io_uring_cqe *submit_and_wait_one(struct io_uring *ring)
{
	struct io_uring_cqe *cqe;
	int ret;

	ret = io_uring_submit(ring);
	if (ret != 1) {
		fprintf(stderr, "sqe submit failed: %d\n", ret);
		return NULL;
	}

	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret < 0) {
		fprintf(stderr, "wait completion %d\n", ret);
		return NULL;
	}

	return cqe;
}

static int test_invalid_zcrx_request(void *area)
{
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	struct io_uring ring;
	__u32 zcrx_id;
	int ret, fds[2];

	ret = create_ring_with_ifq(&ring, area, &zcrx_id);
	if (ret != T_SETUP_OK) {
		fprintf(stderr, "ifq-ring create failed: %d\n", ret);
		return T_EXIT_FAIL;
	}

	ret = t_create_socket_pair(fds, true);
	if (ret) {
		fprintf(stderr, "t_create_socket_pair failed: %d\n", ret);
		return ret;
	}

	/* invalid file */
	sqe = io_uring_get_sqe(&ring);
	test_io_uring_prep_zcrx(sqe, ring.ring_fd, zcrx_id);

	cqe = submit_and_wait_one(&ring);
	if (!cqe) {
		fprintf(stderr, "submit_and_wait_one failed\n");
		return T_EXIT_FAIL;
	}
	if (cqe->flags & IORING_CQE_F_MORE) {
		fprintf(stderr, "unexpected F_MORE for invalid fd\n");
		return T_EXIT_FAIL;
	}
	if (cqe->res != -ENOTSOCK) {
		fprintf(stderr, "zcrx for non-socket file\n");
		return T_EXIT_FAIL;
	}
	io_uring_cqe_seen(&ring, cqe);

	/* invalid ifq idx */
	sqe = io_uring_get_sqe(&ring);
	test_io_uring_prep_zcrx(sqe, fds[0], zcrx_id + 1);

	cqe = submit_and_wait_one(&ring);
	if (!cqe) {
		fprintf(stderr, "submit_and_wait_one failed\n");
		return T_EXIT_FAIL;
	}
	if (cqe->flags & IORING_CQE_F_MORE) {
		fprintf(stderr, "unexpected F_MORE for invalid fd\n");
		return T_EXIT_FAIL;
	}
	if (cqe->res != -EINVAL) {
		fprintf(stderr, "zcrx recv with non-existent zcrx ifq\n");
		return T_EXIT_FAIL;
	}
	io_uring_cqe_seen(&ring, cqe);

	close(fds[0]);
	close(fds[1]);
	io_uring_queue_exit(&ring);
	return 0;
}

struct recv_data {
	pthread_barrier_t connect;
	pthread_barrier_t startup;
	pthread_barrier_t barrier;
	pthread_barrier_t finish;

	int accept_fd;
	char buf[MSG_SIZE];
	void *area;
	void *ring_ptr;
	unsigned int ring_sz;
	struct io_uring_zcrx_rq rq_ring;
};

static int recv_prep(struct io_uring *ring, struct recv_data *rd, int *sock,
		     __u32 zcrx_id)
{
	struct sockaddr_in saddr;
	struct io_uring_sqe *sqe;
	int sockfd, ret, val, use_fd;
	socklen_t socklen;

	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_family = AF_INET;
	saddr.sin_addr.s_addr = htonl(INADDR_ANY);
	saddr.sin_port = htons(PORT);

	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	if (sockfd < 0) {
		perror("socket");
		return 1;
	}

	val = 1;
	setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));

	ret = bind(sockfd, (struct sockaddr *)&saddr, sizeof(saddr));
	if (ret < 0) {
		perror("bind");
		goto err;
	}

	ret = listen(sockfd, 1);
	if (ret < 0) {
		perror("listen");
		goto err;
	}

	pthread_barrier_wait(&rd->connect);

	socklen = sizeof(saddr);
	use_fd = accept(sockfd, (struct sockaddr *)&saddr, &socklen);
	if (use_fd < 0) {
		perror("accept");
		goto err;
	}

	rd->accept_fd = use_fd;
	pthread_barrier_wait(&rd->startup);
	pthread_barrier_wait(&rd->barrier);

	sqe = io_uring_get_sqe(ring);
	io_uring_prep_rw(IORING_OP_RECV_ZC, sqe, use_fd, NULL, 0, 0);
	sqe->zcrx_ifq_idx = zcrx_id;
	sqe->ioprio |= IORING_RECV_MULTISHOT;
	sqe->user_data = 2;

	ret = io_uring_submit(ring);
	if (ret <= 0) {
		fprintf(stderr, "submit failed: %d\n", ret);
		goto err;
	}

	*sock = sockfd;
	return 0;
err:
	close(sockfd);
	return 1;
}

static struct io_uring_zcrx_rqe* get_refill_entry(struct io_uring_zcrx_rq *rq_ring)
{
	unsigned mask = rq_ring->ring_entries - 1;
	struct io_uring_zcrx_rqe* rqe;

	rqe = &rq_ring->rqes[rq_ring->rq_tail & mask];
	rq_ring->rq_tail++;
	return rqe;
}

static void refill_garbage(struct recv_data *rd, uint64_t area_token)
{
	struct io_uring_zcrx_rq *rq_ring = &rd->rq_ring;
	struct io_uring_zcrx_rqe* rqe;
	int i = 0;

	/* invalid area */
	rqe = get_refill_entry(rq_ring);
	rqe->off = (area_token + 1) << IORING_ZCRX_AREA_SHIFT;
	i++;

	/* invalid area offset */
	rqe = get_refill_entry(rq_ring);
	rqe->off = AREA_SZ | (area_token << IORING_ZCRX_AREA_SHIFT);
	rqe->off += AREA_SZ;
	i++;

	for (; i < rq_ring->ring_entries; i++) {
		rqe = get_refill_entry(rq_ring);
		rqe->off = ((uint64_t)1 << IORING_ZCRX_AREA_SHIFT) - 1;
	}

	io_uring_smp_store_release(rq_ring->ktail, rq_ring->rq_tail);
}

static int do_recv(struct io_uring *ring, struct recv_data *rd,
		   uint64_t refill_area_token)
{
	struct io_uring_cqe *cqe;
	struct io_uring_zcrx_cqe *zcqe;
	int i, ret;

	refill_garbage(rd, refill_area_token);

	for (i = 0; i < LOOP_COUNT - 1; i++) {
		uint64_t off, mask = (1ULL << IORING_ZCRX_AREA_SHIFT) - 1;
		void *addr;

		ret = io_uring_wait_cqe(ring, &cqe);
		if (ret) {
			fprintf(stdout, "wait_cqe: %d\n", ret);
			return 1;
		}
		if (cqe->res == -EINVAL) {
			fprintf(stdout, "recv not supported, skipping\n");
			goto out;
		}
		if (cqe->res < 0) {
			fprintf(stderr, "failed recv cqe: %d\n", cqe->res);
			goto err;
		}
		if (cqe->res - 1 != strlen(str)) {
			fprintf(stderr, "got wrong length: %d/%d\n", cqe->res,
								(int) strlen(str) + 1);
			goto err;
		}

		zcqe = (struct io_uring_zcrx_cqe *)(cqe + 1);
		off = zcqe->off & mask;
		addr = (char *) rd->area + off;
		ret = strncmp(str, addr, sizeof(str));
		if (ret != 0) {
			fprintf(stderr, "recv incorrect payload: %s\n", (const char *)addr);
			goto err;
		}

		io_uring_cqe_seen(ring, cqe);
	}

	ret = io_uring_wait_cqe(ring, &cqe);
	if (ret) {
		fprintf(stdout, "wait_cqe: %d\n", ret);
		return 1;
	}
	if (cqe->res != -ENOMEM) {
		fprintf(stdout, "final recv cqe did not return ENOMEM\n");
		goto err;
	}

out:
	io_uring_cqe_seen(ring, cqe);
	pthread_barrier_wait(&rd->finish);
	return 0;
err:
	io_uring_cqe_seen(ring, cqe);
	pthread_barrier_wait(&rd->finish);
	return 1;
}

static void *recv_fn(void *data)
{
	struct recv_data *rd = data;
	struct io_uring_params p = { };
	struct io_uring ring;
	int ret, sock;
	struct io_uring_zcrx_area_reg area_reg = {
		.addr = uring_ptr_to_u64(rd->area),
		.len = AREA_SZ,
		.flags = 0,
	};
	struct io_uring_zcrx_ifq_reg reg = {
		.if_idx = ifidx,
		.if_rxq = rxq,
		.rq_entries = RQ_ENTRIES,
		.area_ptr = uring_ptr_to_u64(&area_reg),
	};

	p.flags = RING_FLAGS;
	ret = t_create_ring_params(8, &ring, &p);
	if (ret == T_SETUP_SKIP) {
		ret = 0;
		goto err;
	} else if (ret < 0) {
		goto err;
	}

	ret = io_uring_register_ifq(&ring, &reg);
	if (ret != 0) {
		fprintf(stderr, "register_ifq failed: %d\n", ret);
		goto err_ring_exit;
	}

	/*
	rd->ring_ptr = mmap(
		0,
		reg.offsets.mmap_sz,
		PROT_READ | PROT_WRITE,
		MAP_SHARED | MAP_POPULATE,
		ring.enter_ring_fd,
		IORING_OFF_RQ_RING
	);

	rd->ring_sz = reg.offsets.mmap_sz;
	*/
	rd->rq_ring.khead = (__u32*)((char*)rd->ring_ptr + reg.offsets.head);
	rd->rq_ring.ktail = (__u32*)((char*)rd->ring_ptr + reg.offsets.tail);
	rd->rq_ring.rqes = (struct io_uring_zcrx_rqe*)((char*)rd->ring_ptr + reg.offsets.rqes);
	rd->rq_ring.rq_tail = 0;
	rd->rq_ring.ring_entries = reg.rq_entries;

	ret = recv_prep(&ring, rd, &sock, reg.zcrx_id);
	if (ret) {
		fprintf(stderr, "recv_prep failed: %d\n", ret);
		goto err;
	}
	ret = do_recv(&ring, rd, area_reg.rq_area_token);

	close(sock);
	close(rd->accept_fd);
err_ring_exit:
	io_uring_queue_exit(&ring);
err:
	return (void *)(intptr_t)ret;
}

static int do_send(struct recv_data *rd)
{
	struct sockaddr_in saddr;
	struct iovec iov = {
		.iov_base = str,
		.iov_len = sizeof(str),
	};
	struct io_uring ring;
	struct io_uring_cqe *cqe;
	struct io_uring_sqe *sqe;
	int i, sockfd, ret;

	ret = io_uring_queue_init(8, &ring, 0);
	if (ret) {
		fprintf(stderr, "queue init failed: %d\n", ret);
		return 1;
	}

	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_family = AF_INET;
	saddr.sin_port = htons(PORT);
	inet_pton(AF_INET, HOST, &saddr.sin_addr);

	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	if (sockfd < 0) {
		perror("socket");
		goto err2;
	}

	pthread_barrier_wait(&rd->connect);

	ret = connect(sockfd, (struct sockaddr *)&saddr, sizeof(saddr));
	if (ret < 0) {
		perror("connect");
		goto err;
	}

	pthread_barrier_wait(&rd->startup);

	for (i = 0; i < LOOP_COUNT; i++) {
		sqe = io_uring_get_sqe(&ring);
		io_uring_prep_send(sqe, sockfd, iov.iov_base, iov.iov_len, 0);
		sqe->user_data = 1;
	}

	ret = io_uring_submit(&ring);
	if (ret <= 0) {
		fprintf(stderr, "submit failed: %d\n", ret);
		goto err;
	}

	pthread_barrier_wait(&rd->barrier);

	ret = io_uring_wait_cqe(&ring, &cqe);
	if (cqe->res == -EINVAL) {
		fprintf(stdout, "send not supported, skipping\n");
		goto err;
	}
	if (cqe->res != iov.iov_len) {
		fprintf(stderr, "failed cqe: %d\n", cqe->res);
		goto err;
	}

	pthread_barrier_wait(&rd->finish);

	close(sockfd);
	io_uring_queue_exit(&ring);
	return 0;

err:
	close(sockfd);
err2:
	io_uring_queue_exit(&ring);
	pthread_barrier_wait(&rd->finish);
	return 1;
}

static int test_recv(void *area)
{
	pthread_t recv_thread;
	struct recv_data rd;
	int ret;
	void *retval;

	memset(&rd, 0, sizeof(rd));
	pthread_barrier_init(&rd.connect, NULL, 2);
	pthread_barrier_init(&rd.startup, NULL, 2);
	pthread_barrier_init(&rd.barrier, NULL, 2);
	pthread_barrier_init(&rd.finish, NULL, 2);
	rd.area = area;

	ret = pthread_create(&recv_thread, NULL, recv_fn, &rd);
	if (ret) {
		fprintf(stderr, "Thread create failed: %d\n", ret);
		return 1;
	}

	do_send(&rd);
	pthread_join(recv_thread, &retval);
	return (intptr_t)retval;
}

int main(int argc, char *argv[])
{
	char *dev, *rxq_str, *rxq_end;
	void *area_outer, *area;
	int ret;

	if (argc > 1)
		return T_EXIT_SKIP;

	page_size = sysconf(_SC_PAGESIZE);
	if (page_size < 0) {
		perror("sysconf(_SC_PAGESIZE)");
		return T_EXIT_FAIL;
	}

	area_outer = mmap(NULL, AREA_SZ + 8192, PROT_NONE,
		MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE, -1, 0);
	if (area_outer == MAP_FAILED) {
		perror("mmap");
		return T_EXIT_FAIL;
	}

	area = mmap(area_outer, AREA_SZ, PROT_READ | PROT_WRITE,
			MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
	if (area == MAP_FAILED) {
		perror("mmap");
		return T_EXIT_FAIL;
	}

	dev = getenv(DEV_ENV_VAR);
	if (!dev)
		return T_EXIT_SKIP;

	ifidx = if_nametoindex(dev);
	if (!ifidx)
		return T_EXIT_SKIP;

	rxq_str = getenv(RXQ_ENV_VAR);
	if (!rxq_str)
		return T_EXIT_SKIP;

	rxq = strtol(rxq_str, &rxq_end, 10);
	if (rxq_end == rxq_str || *rxq_end != '\0')
		return T_EXIT_SKIP;

	ret = probe_zcrx(area);
	if (ret != T_EXIT_PASS)
		return ret;

	ret = test_rq_setup(area);
	if (ret) {
		fprintf(stderr, "test_invalid_reg_struct failed\n");
		return ret;
	}

	ret = test_null_area_reg_struct();
	if (ret) {
		fprintf(stderr, "test_null_area_reg_struct failed\n");
		return ret;
	}

	ret = test_null_area();
	if (ret) {
		fprintf(stderr, "test_null_area failed\n");
		return ret;
	}

	ret = test_misaligned_area(area);
	if (ret) {
		fprintf(stderr, "test_misaligned_area failed\n");
		return ret;
	}

	ret = test_larger_than_alloc_area(area);
	if (ret) {
		fprintf(stderr, "test_larger_than_alloc_area failed\n");
		return ret;
	}

	ret = test_area_access();
	if (ret) {
		fprintf(stderr, "test_area_access failed\n");
		return ret;
	}

	ret = test_invalid_if(area);
	if (ret) {
		fprintf(stderr, "test_invalid_if failed\n");
		return ret;
	}

	ret = test_invalid_ifq_collision(area);
	if (ret) {
		fprintf(stderr, "test_invalid_ifq_collision failed\n");
		return ret;
	}

	ret = test_invalid_zcrx_request(area);
	if (ret) {
		fprintf(stderr, "test_invalid_ifq_collision failed\n");
		return ret;
	}

	ret = test_recv(area);
	if (ret) {
		fprintf(stderr, "test_recv failed\n");
		return ret;
	}

	munmap(area, AREA_SZ);
	return T_EXIT_PASS;
}