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#include "../config-host.h"
/* SPDX-License-Identifier: MIT */
/*
* Description: test reading provided ring buf head
*
*/
#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 32
#define NR_BUFS 8
#define FSIZE (BUF_SIZE * NR_BUFS)
#define BR_MASK (NR_BUFS - 1)
#define BGID 1
static int no_buf_ring;
static int no_buf_ring_status;
static int test_max(void)
{
struct io_uring_buf_ring *br;
struct io_uring ring;
int nr_bufs = 32768;
int ret, i;
char *buf;
ret = io_uring_queue_init(1, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
if (posix_memalign((void **) &buf, 4096, FSIZE))
return 1;
br = io_uring_setup_buf_ring(&ring, nr_bufs, BGID, 0, &ret);
if (!br) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
ret = io_uring_buf_ring_available(&ring, br, BGID);
if (ret) {
fprintf(stderr, "Bad available count %d\n", ret);
return 1;
}
for (i = 0; i < nr_bufs / 2; i++)
io_uring_buf_ring_add(br, buf, BUF_SIZE, i + 1, nr_bufs - 1, i);
io_uring_buf_ring_advance(br, nr_bufs / 2);
ret = io_uring_buf_ring_available(&ring, br, BGID);
if (ret != nr_bufs / 2) {
fprintf(stderr, "Bad half full available count %d\n", ret);
return 1;
}
for (i = 0; i < nr_bufs / 2; i++)
io_uring_buf_ring_add(br, buf, BUF_SIZE, i + 1, nr_bufs - 1, i);
io_uring_buf_ring_advance(br, nr_bufs / 2);
ret = io_uring_buf_ring_available(&ring, br, BGID);
if (ret != nr_bufs) {
fprintf(stderr, "Bad half full available count %d\n", ret);
return 1;
}
free(buf);
io_uring_queue_exit(&ring);
return T_EXIT_PASS;
}
static int test(int invalid)
{
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
struct io_uring_buf_ring *br;
int ret, i, fds[2];
uint16_t head;
char *buf;
void *ptr;
char output[16];
memset(output, 0x55, sizeof(output));
ret = io_uring_queue_init(NR_BUFS, &ring, 0);
if (ret) {
fprintf(stderr, "ring setup failed: %d\n", ret);
return 1;
}
if (pipe(fds) < 0) {
perror("pipe");
return T_EXIT_FAIL;
}
if (posix_memalign((void **) &buf, 4096, FSIZE))
return 1;
br = io_uring_setup_buf_ring(&ring, NR_BUFS, BGID, 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);
/* head should be zero at this point */
head = 1;
if (!invalid)
ret = io_uring_buf_ring_head(&ring, BGID, &head);
else
ret = io_uring_buf_ring_head(&ring, BGID + 10, &head);
if (ret) {
if (ret == -EINVAL) {
no_buf_ring_status = 1;
return T_EXIT_SKIP;
}
if (invalid && ret == -ENOENT)
return T_EXIT_PASS;
fprintf(stderr, "buf_ring_head: %d\n", ret);
return T_EXIT_FAIL;
}
if (invalid) {
fprintf(stderr, "lookup of bad group id succeeded\n");
return T_EXIT_FAIL;
}
if (head != 0) {
fprintf(stderr, "bad head %d\n", head);
return T_EXIT_FAIL;
}
ret = io_uring_buf_ring_available(&ring, br, BGID);
if (ret != NR_BUFS) {
fprintf(stderr, "ring available %d\n", ret);
return T_EXIT_FAIL;
}
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fds[0], NULL, BUF_SIZE, i * BUF_SIZE);
sqe->buf_group = BGID;
sqe->flags |= IOSQE_BUFFER_SELECT;
sqe->user_data = 1;
ret = io_uring_submit(&ring);
if (ret != 1) {
fprintf(stderr, "submit: %d\n", ret);
return T_EXIT_FAIL;
}
/* head should still be zero at this point, no buffers consumed */
head = 1;
ret = io_uring_buf_ring_head(&ring, BGID, &head);
if (head != 0) {
fprintf(stderr, "bad head after submit %d\n", head);
return T_EXIT_FAIL;
}
ret = write(fds[1], output, sizeof(output));
if (ret != sizeof(output)) {
fprintf(stderr, "pipe buffer write %d\n", ret);
return T_EXIT_FAIL;
}
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait cqe failed %d\n", ret);
return T_EXIT_FAIL;
}
if (cqe->res != sizeof(output)) {
fprintf(stderr, "cqe res %d\n", cqe->res);
return T_EXIT_FAIL;
}
if (!(cqe->flags & IORING_CQE_F_BUFFER)) {
fprintf(stderr, "no buffer selected\n");
return T_EXIT_FAIL;
}
io_uring_cqe_seen(&ring, cqe);
/* head should now be one, we consumed a buffer */
ret = io_uring_buf_ring_head(&ring, BGID, &head);
if (head != 1) {
fprintf(stderr, "bad head after cqe %d\n", head);
return T_EXIT_FAIL;
}
ret = io_uring_buf_ring_available(&ring, br, BGID);
if (ret != NR_BUFS - 1) {
fprintf(stderr, "ring available %d\n", ret);
return T_EXIT_FAIL;
}
close(fds[0]);
close(fds[1]);
free(buf);
io_uring_queue_exit(&ring);
return T_EXIT_PASS;
}
int main(int argc, char *argv[])
{
int ret;
ret = test(0);
if (ret == T_EXIT_FAIL) {
fprintf(stderr, "test 0 failed\n");
return T_EXIT_FAIL;
}
if (no_buf_ring || no_buf_ring_status)
return T_EXIT_SKIP;
ret = test(1);
if (ret == T_EXIT_FAIL) {
fprintf(stderr, "test 1 failed\n");
return T_EXIT_FAIL;
}
ret = test_max();
if (ret == T_EXIT_FAIL) {
fprintf(stderr, "test_max failed\n");
return T_EXIT_FAIL;
}
return T_EXIT_PASS;
}
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