// SPDX-License-Identifier: GPL-2.0-only
/* io_uring tests for vsock
 *
 * Copyright (C) 2023 SberDevices.
 *
 * Author: Arseniy Krasnov <avkrasnov@salutedevices.com>
 */

#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <liburing.h>
#include <unistd.h>
#include <sys/mman.h>
#include <linux/kernel.h>
#include <error.h>

#include "util.h"
#include "control.h"
#include "msg_zerocopy_common.h"

#ifndef PAGE_SIZE
#define PAGE_SIZE		4096
#endif

#define RING_ENTRIES_NUM	4

#define VSOCK_TEST_DATA_MAX_IOV 3

struct vsock_io_uring_test {
	/* Number of valid elements in 'vecs'. */
	int vecs_cnt;
	struct iovec vecs[VSOCK_TEST_DATA_MAX_IOV];
};

static struct vsock_io_uring_test test_data_array[] = {
	/* All elements have page aligned base and size. */
	{
		.vecs_cnt = 3,
		{
			{ NULL, PAGE_SIZE },
			{ NULL, 2 * PAGE_SIZE },
			{ NULL, 3 * PAGE_SIZE },
		}
	},
	/* Middle element has both non-page aligned base and size. */
	{
		.vecs_cnt = 3,
		{
			{ NULL, PAGE_SIZE },
			{ (void *)1, 200  },
			{ NULL, 3 * PAGE_SIZE },
		}
	}
};

static void vsock_io_uring_client(const struct test_opts *opts,
				  const struct vsock_io_uring_test *test_data,
				  bool msg_zerocopy)
{
	struct io_uring_sqe *sqe;
	struct io_uring_cqe *cqe;
	struct io_uring ring;
	struct iovec *iovec;
	struct msghdr msg;
	int fd;

	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
	if (fd < 0) {
		perror("connect");
		exit(EXIT_FAILURE);
	}

	if (msg_zerocopy)
		enable_so_zerocopy(fd);

	iovec = alloc_test_iovec(test_data->vecs, test_data->vecs_cnt);

	if (io_uring_queue_init(RING_ENTRIES_NUM, &ring, 0))
		error(1, errno, "io_uring_queue_init");

	if (io_uring_register_buffers(&ring, iovec, test_data->vecs_cnt))
		error(1, errno, "io_uring_register_buffers");

	memset(&msg, 0, sizeof(msg));
	msg.msg_iov = iovec;
	msg.msg_iovlen = test_data->vecs_cnt;
	sqe = io_uring_get_sqe(&ring);

	if (msg_zerocopy)
		io_uring_prep_sendmsg_zc(sqe, fd, &msg, 0);
	else
		io_uring_prep_sendmsg(sqe, fd, &msg, 0);

	if (io_uring_submit(&ring) != 1)
		error(1, errno, "io_uring_submit");

	if (io_uring_wait_cqe(&ring, &cqe))
		error(1, errno, "io_uring_wait_cqe");

	io_uring_cqe_seen(&ring, cqe);

	control_writeulong(iovec_hash_djb2(iovec, test_data->vecs_cnt));

	control_writeln("DONE");
	io_uring_queue_exit(&ring);
	free_test_iovec(test_data->vecs, iovec, test_data->vecs_cnt);
	close(fd);
}

static void vsock_io_uring_server(const struct test_opts *opts,
				  const struct vsock_io_uring_test *test_data)
{
	unsigned long remote_hash;
	unsigned long local_hash;
	struct io_uring ring;
	size_t data_len;
	size_t recv_len;
	void *data;
	int fd;

	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
	if (fd < 0) {
		perror("accept");
		exit(EXIT_FAILURE);
	}

	data_len = iovec_bytes(test_data->vecs, test_data->vecs_cnt);

	data = malloc(data_len);
	if (!data) {
		perror("malloc");
		exit(EXIT_FAILURE);
	}

	if (io_uring_queue_init(RING_ENTRIES_NUM, &ring, 0))
		error(1, errno, "io_uring_queue_init");

	recv_len = 0;

	while (recv_len < data_len) {
		struct io_uring_sqe *sqe;
		struct io_uring_cqe *cqe;
		struct iovec iovec;

		sqe = io_uring_get_sqe(&ring);
		iovec.iov_base = data + recv_len;
		iovec.iov_len = data_len;

		io_uring_prep_readv(sqe, fd, &iovec, 1, 0);

		if (io_uring_submit(&ring) != 1)
			error(1, errno, "io_uring_submit");

		if (io_uring_wait_cqe(&ring, &cqe))
			error(1, errno, "io_uring_wait_cqe");

		recv_len += cqe->res;
		io_uring_cqe_seen(&ring, cqe);
	}

	if (recv_len != data_len) {
		fprintf(stderr, "expected %zu, got %zu\n", data_len,
			recv_len);
		exit(EXIT_FAILURE);
	}

	local_hash = hash_djb2(data, data_len);

	remote_hash = control_readulong();
	if (remote_hash != local_hash) {
		fprintf(stderr, "hash mismatch\n");
		exit(EXIT_FAILURE);
	}

	control_expectln("DONE");
	io_uring_queue_exit(&ring);
	free(data);
}

void test_stream_uring_server(const struct test_opts *opts)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(test_data_array); i++)
		vsock_io_uring_server(opts, &test_data_array[i]);
}

void test_stream_uring_client(const struct test_opts *opts)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(test_data_array); i++)
		vsock_io_uring_client(opts, &test_data_array[i], false);
}

void test_stream_uring_msg_zc_server(const struct test_opts *opts)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(test_data_array); i++)
		vsock_io_uring_server(opts, &test_data_array[i]);
}

void test_stream_uring_msg_zc_client(const struct test_opts *opts)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(test_data_array); i++)
		vsock_io_uring_client(opts, &test_data_array[i], true);
}

static struct test_case test_cases[] = {
	{
		.name = "SOCK_STREAM io_uring test",
		.run_server = test_stream_uring_server,
		.run_client = test_stream_uring_client,
	},
	{
		.name = "SOCK_STREAM io_uring MSG_ZEROCOPY test",
		.run_server = test_stream_uring_msg_zc_server,
		.run_client = test_stream_uring_msg_zc_client,
	},
	{},
};

static const char optstring[] = "";
static const struct option longopts[] = {
	{
		.name = "control-host",
		.has_arg = required_argument,
		.val = 'H',
	},
	{
		.name = "control-port",
		.has_arg = required_argument,
		.val = 'P',
	},
	{
		.name = "mode",
		.has_arg = required_argument,
		.val = 'm',
	},
	{
		.name = "peer-cid",
		.has_arg = required_argument,
		.val = 'p',
	},
	{
		.name = "peer-port",
		.has_arg = required_argument,
		.val = 'q',
	},
	{
		.name = "help",
		.has_arg = no_argument,
		.val = '?',
	},
	{},
};

static void usage(void)
{
	fprintf(stderr, "Usage: vsock_uring_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--peer-port=<port>]\n"
		"\n"
		"  Server: vsock_uring_test --control-port=1234 --mode=server --peer-cid=3\n"
		"  Client: vsock_uring_test --control-host=192.168.0.1 --control-port=1234 --mode=client --peer-cid=2\n"
		"\n"
		"Run transmission tests using io_uring. Usage is the same as\n"
		"in ./vsock_test\n"
		"\n"
		"Options:\n"
		"  --help                 This help message\n"
		"  --control-host <host>  Server IP address to connect to\n"
		"  --control-port <port>  Server port to listen on/connect to\n"
		"  --mode client|server   Server or client mode\n"
		"  --peer-cid <cid>       CID of the other side\n"
		"  --peer-port <port>     AF_VSOCK port used for the test [default: %d]\n",
		DEFAULT_PEER_PORT
		);
	exit(EXIT_FAILURE);
}

int main(int argc, char **argv)
{
	const char *control_host = NULL;
	const char *control_port = NULL;
	struct test_opts opts = {
		.mode = TEST_MODE_UNSET,
		.peer_cid = VMADDR_CID_ANY,
		.peer_port = DEFAULT_PEER_PORT,
	};

	init_signals();

	for (;;) {
		int opt = getopt_long(argc, argv, optstring, longopts, NULL);

		if (opt == -1)
			break;

		switch (opt) {
		case 'H':
			control_host = optarg;
			break;
		case 'm':
			if (strcmp(optarg, "client") == 0) {
				opts.mode = TEST_MODE_CLIENT;
			} else if (strcmp(optarg, "server") == 0) {
				opts.mode = TEST_MODE_SERVER;
			} else {
				fprintf(stderr, "--mode must be \"client\" or \"server\"\n");
				return EXIT_FAILURE;
			}
			break;
		case 'p':
			opts.peer_cid = parse_cid(optarg);
			break;
		case 'q':
			opts.peer_port = parse_port(optarg);
			break;
		case 'P':
			control_port = optarg;
			break;
		case '?':
		default:
			usage();
		}
	}

	if (!control_port)
		usage();
	if (opts.mode == TEST_MODE_UNSET)
		usage();
	if (opts.peer_cid == VMADDR_CID_ANY)
		usage();

	if (!control_host) {
		if (opts.mode != TEST_MODE_SERVER)
			usage();
		control_host = "0.0.0.0";
	}

	control_init(control_host, control_port,
		     opts.mode == TEST_MODE_SERVER);

	run_tests(test_cases, &opts);

	control_cleanup();

	return 0;
}