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/* SPDX-License-Identifier: MIT */
/*
* Description: test IOU_PBUF_RING_MMAP with a ring setup with a ring
* setup without mmap'ing sq/cq arrays
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include "liburing.h"
#include "helpers.h"
static int bgid = 5;
static int bid = 89;
int main(int argc, char *argv[])
{
struct io_uring_buf_ring *br;
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
size_t ring_size;
int ret, ring_mask, fds[2];
struct io_uring_buf_reg reg = {
.ring_entries = 1,
.bgid = bgid,
.flags = IOU_PBUF_RING_MMAP,
};
struct io_uring_params p = { };
void *ring_mem;
char buf[32];
off_t off;
if (argc > 1)
return T_EXIT_SKIP;
if (posix_memalign(&ring_mem, 16384, 16384))
return T_EXIT_FAIL;
memset(ring_mem, 0, 16384);
p.flags = IORING_SETUP_NO_MMAP;
ret = io_uring_queue_init_mem(1, &ring, &p, ring_mem, 16384);
if (ret < 0) {
if (ret == -EINVAL || ret == -ENOMEM) {
free(ring_mem);
return T_EXIT_SKIP;
}
fprintf(stderr, "queue init failed %d\n", ret);
return T_EXIT_FAIL;
}
if (pipe(fds) < 0) {
perror("pipe");
return T_EXIT_FAIL;
}
ring_size = sizeof(struct io_uring_buf);
ring_mask = io_uring_buf_ring_mask(1);
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret) {
if (ret == -EINVAL) {
free(ring_mem);
return T_EXIT_SKIP;
}
fprintf(stderr, "reg buf ring: %d\n", ret);
return T_EXIT_FAIL;
}
off = IORING_OFF_PBUF_RING |
(unsigned long long) bgid << IORING_OFF_PBUF_SHIFT;
br = mmap(NULL, ring_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, ring.ring_fd, off);
if (br == MAP_FAILED) {
if (errno == ENOMEM) {
free(ring_mem);
return T_EXIT_SKIP;
}
perror("mmap");
return T_EXIT_FAIL;
}
io_uring_buf_ring_add(br, buf, sizeof(buf), bid, ring_mask, 0);
io_uring_buf_ring_advance(br, 1);
sqe = io_uring_get_sqe(&ring);
io_uring_prep_read(sqe, fds[0], NULL, 0, 0);
sqe->flags |= IOSQE_BUFFER_SELECT;
sqe->buf_group = bgid;
io_uring_submit(&ring);
ret = write(fds[1], "Hello", 5);
if (ret < 0) {
perror("write");
return T_EXIT_FAIL;
} else if (ret != 5) {
fprintf(stderr, "short write %d\n", ret);
return T_EXIT_FAIL;
}
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait %d\n", ret);
return T_EXIT_FAIL;
}
if (cqe->res < 0) {
fprintf(stderr, "cqe res %d\n", cqe->res);
return T_EXIT_FAIL;
}
if (!(cqe->flags & IORING_CQE_F_BUFFER)) {
fprintf(stderr, "buffer not selected in cqe\n");
return T_EXIT_FAIL;
}
if ((cqe->flags >> IORING_CQE_BUFFER_SHIFT) != bid) {
fprintf(stderr, "wrong buffer id returned\n");
return T_EXIT_FAIL;
}
io_uring_cqe_seen(&ring, cqe);
io_uring_queue_exit(&ring);
free(ring_mem);
return T_EXIT_PASS;
}
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