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/* SPDX-License-Identifier: MIT */
/*
* Description: ring mapped provided buffers with reads
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "liburing.h"
#include "helpers.h"
#define BUF_SIZE 4096
#define NR_BUFS 128
#define FSIZE (BUF_SIZE * NR_BUFS)
#define BR_MASK (NR_BUFS - 1)
static int no_buf_ring;
static int verify_buffer(char *buf, char val)
{
int i;
for (i = 0; i < BUF_SIZE; i++) {
if (buf[i] != val) {
fprintf(stderr, "got %d, wanted %d\n", buf[i], val);
return 1;
}
}
return 0;
}
static int test(const char *filename, int dio, int async)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
struct io_uring_buf_ring *br;
int ret, fd, i;
char *buf;
void *ptr;
ret = io_uring_queue_init(NR_BUFS, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
if (dio) {
fd = open(filename, O_DIRECT | O_RDONLY);
if (fd < 0 && errno == EINVAL)
return T_EXIT_SKIP;
} else {
fd = open(filename, O_RDONLY);
}
if (fd < 0) {
if (errno == EPERM || errno == EACCES)
return T_EXIT_SKIP;
perror("open");
return 1;
}
posix_fadvise(fd, 0, FSIZE, POSIX_FADV_DONTNEED);
if (posix_memalign((void **) &buf, 4096, FSIZE))
return 1;
br = io_uring_setup_buf_ring(&ring, NR_BUFS, 1, 0, &ret);
if (!br) {
if (ret == -EINVAL) {
no_buf_ring = 1;
return 0;
}
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
ptr = buf;
for (i = 0; i < NR_BUFS; i++) {
io_uring_buf_ring_add(br, ptr, BUF_SIZE, i + 1, BR_MASK, i);
ptr += BUF_SIZE;
}
io_uring_buf_ring_advance(br, NR_BUFS);
for (i = 0; i < NR_BUFS / 2; i++) {
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fd, NULL, BUF_SIZE, i * BUF_SIZE);
sqe->buf_group = 1;
sqe->flags |= IOSQE_BUFFER_SELECT;
if (async && !(i & 1))
sqe->flags |= IOSQE_ASYNC;
sqe->user_data = i + 1;
}
ret = io_uring_submit(&ring);
if (ret != NR_BUFS / 2) {
fprintf(stderr, "submit: %d\n", ret);
return 1;
}
for (i = 0; i < NR_BUFS / 2; i++) {
int bid, ud;
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait cqe failed %d\n", ret);
return 1;
}
if (cqe->res != BUF_SIZE) {
fprintf(stderr, "cqe res %d\n", cqe->res);
return 1;
}
if (!(cqe->flags & IORING_CQE_F_BUFFER)) {
fprintf(stderr, "no buffer selected\n");
return 1;
}
bid = cqe->flags >> IORING_CQE_BUFFER_SHIFT;
ud = cqe->user_data;
io_uring_cqe_seen(&ring, cqe);
if (verify_buffer(buf + ((bid - 1) * BUF_SIZE), ud))
return 1;
}
free(buf);
return 0;
}
int main(int argc, char *argv[])
{
char buf[BUF_SIZE];
char fname[80];
int ret, fd, i, do_unlink;
if (argc > 1) {
strcpy(fname, argv[1]);
do_unlink = 0;
} else {
sprintf(fname, ".ringbuf-read.%d", getpid());
t_create_file(fname, FSIZE);
do_unlink = 1;
}
fd = open(fname, O_WRONLY);
if (fd < 0) {
if (errno == EPERM || errno == EACCES)
return T_EXIT_SKIP;
perror("open");
goto err;
}
for (i = 0; i < NR_BUFS; i++) {
memset(buf, i + 1, BUF_SIZE);
ret = write(fd, buf, BUF_SIZE);
if (ret != BUF_SIZE) {
fprintf(stderr, "bad file prep write\n");
close(fd);
goto err;
}
}
close(fd);
ret = test(fname, 1, 0);
if (ret == T_EXIT_FAIL) {
fprintf(stderr, "dio test failed\n");
goto err;
}
if (no_buf_ring)
goto pass;
ret = test(fname, 0, 0);
if (ret) {
fprintf(stderr, "buffered test failed\n");
goto err;
}
ret = test(fname, 1, 1);
if (ret == T_EXIT_FAIL) {
fprintf(stderr, "dio async test failed\n");
goto err;
}
ret = test(fname, 0, 1);
if (ret == T_EXIT_FAIL) {
fprintf(stderr, "buffered async test failed\n");
goto err;
}
pass:
ret = T_EXIT_PASS;
goto out;
err:
ret = T_EXIT_FAIL;
out:
if (do_unlink)
unlink(fname);
return ret;
}
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