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#include "../config-host.h"
/* SPDX-License-Identifier: MIT */
/*
* Description: run various shared buffer ring sanity checks
*
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include "liburing.h"
#include "helpers.h"
static int no_buf_ring;
/* test trying to register classic group when ring group exists */
static int test_mixed_reg2(int bgid)
{
struct io_uring_buf_reg reg = { };
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
void *ptr, *bufs;
int ret;
ret = t_create_ring(1, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret != T_SETUP_OK)
return 1;
if (posix_memalign(&ptr, 4096, 4096))
return 1;
reg.ring_addr = (unsigned long) ptr;
reg.ring_entries = 32;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
/* provide classic buffers, group 1 */
bufs = malloc(8 * 1024);
sqe = io_uring_get_sqe(&ring);
io_uring_prep_provide_buffers(sqe, bufs, 1024, 8, bgid, 0);
io_uring_submit(&ring);
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait_cqe %d\n", ret);
return 1;
}
if (cqe->res != -EEXIST && cqe->res != -EINVAL) {
fprintf(stderr, "cqe res %d\n", cqe->res);
return 1;
}
io_uring_cqe_seen(&ring, cqe);
io_uring_queue_exit(&ring);
return 0;
}
/* test trying to register ring group when classic group exists */
static int test_mixed_reg(int bgid)
{
struct io_uring_buf_reg reg = { };
struct io_uring_sqe *sqe;
struct io_uring_cqe *cqe;
struct io_uring ring;
void *ptr, *bufs;
int ret;
ret = t_create_ring(1, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret != T_SETUP_OK)
return 1;
/* provide classic buffers, group 1 */
bufs = malloc(8 * 1024);
sqe = io_uring_get_sqe(&ring);
io_uring_prep_provide_buffers(sqe, bufs, 1024, 8, bgid, 0);
io_uring_submit(&ring);
ret = io_uring_wait_cqe(&ring, &cqe);
if (ret) {
fprintf(stderr, "wait_cqe %d\n", ret);
return 1;
}
if (cqe->res) {
fprintf(stderr, "cqe res %d\n", cqe->res);
return 1;
}
io_uring_cqe_seen(&ring, cqe);
if (posix_memalign(&ptr, 4096, 4096))
return 1;
reg.ring_addr = (unsigned long) ptr;
reg.ring_entries = 32;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret != -EEXIST) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
io_uring_queue_exit(&ring);
return 0;
}
static int test_double_reg_unreg(int bgid)
{
struct io_uring_buf_reg reg = { };
struct io_uring ring;
void *ptr;
int ret;
ret = t_create_ring(1, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret != T_SETUP_OK)
return 1;
if (posix_memalign(&ptr, 4096, 4096))
return 1;
reg.ring_addr = (unsigned long) ptr;
reg.ring_entries = 32;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
/* check that 2nd register with same bgid fails */
reg.ring_addr = (unsigned long) ptr;
reg.ring_entries = 32;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret != -EEXIST) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
ret = io_uring_unregister_buf_ring(&ring, bgid);
if (ret) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
ret = io_uring_unregister_buf_ring(&ring, bgid);
if (ret != -EINVAL && ret != -ENOENT) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
io_uring_queue_exit(&ring);
return 0;
}
static int test_reg_unreg(int bgid)
{
struct io_uring_buf_reg reg = { };
struct io_uring ring;
void *ptr;
int ret;
ret = t_create_ring(1, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret != T_SETUP_OK)
return 1;
if (posix_memalign(&ptr, 4096, 4096))
return 1;
reg.ring_addr = (unsigned long) ptr;
reg.ring_entries = 32;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret) {
if (ret == -EINVAL) {
no_buf_ring = 1;
return 0;
}
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
ret = io_uring_unregister_buf_ring(&ring, bgid);
if (ret) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
io_uring_queue_exit(&ring);
return 0;
}
static int test_bad_reg(int bgid)
{
struct io_uring ring;
int ret;
struct io_uring_buf_reg reg = { };
ret = t_create_ring(1, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret != T_SETUP_OK)
return 1;
reg.ring_addr = 4096;
reg.ring_entries = 32;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (!ret)
fprintf(stderr, "Buffer ring register worked unexpectedly\n");
io_uring_queue_exit(&ring);
return !ret;
}
static int test_one_read(int fd, int bgid, struct io_uring *ring)
{
int ret;
struct io_uring_cqe *cqe;
struct io_uring_sqe *sqe;
sqe = io_uring_get_sqe(ring);
if (!sqe) {
fprintf(stderr, "get sqe failed\n");
return -1;
}
io_uring_prep_read(sqe, fd, NULL, 1, 0);
sqe->flags |= IOSQE_BUFFER_SELECT;
sqe->buf_group = bgid;
ret = io_uring_submit(ring);
if (ret <= 0) {
fprintf(stderr, "sqe submit failed: %d\n", ret);
return -1;
}
ret = io_uring_wait_cqe(ring, &cqe);
if (ret < 0) {
fprintf(stderr, "wait completion %d\n", ret);
return -1;
}
ret = cqe->res;
io_uring_cqe_seen(ring, cqe);
if (ret == -ENOBUFS)
return ret;
if (ret != 1) {
fprintf(stderr, "read result %d\n", ret);
return -1;
}
return cqe->flags >> 16;
}
static int test_running(int bgid, int entries, int loops)
{
struct io_uring_buf_reg reg = { };
struct io_uring ring;
void *ptr;
char buffer[8];
int ret;
int ring_size = (entries * sizeof(struct io_uring_buf) + 4095) & (~4095);
int ring_mask = io_uring_buf_ring_mask(entries);
int loop, idx;
bool *buffers;
struct io_uring_buf_ring *br;
int read_fd;
ret = t_create_ring(1, &ring, 0);
if (ret == T_SETUP_SKIP)
return 0;
else if (ret != T_SETUP_OK)
return 1;
if (posix_memalign(&ptr, 4096, ring_size))
return 1;
br = (struct io_uring_buf_ring *)ptr;
io_uring_buf_ring_init(br);
buffers = malloc(sizeof(bool) * entries);
if (!buffers)
return 1;
read_fd = open("/dev/zero", O_RDONLY);
if (read_fd < 0)
return 1;
reg.ring_addr = (unsigned long) ptr;
reg.ring_entries = entries;
reg.bgid = bgid;
ret = io_uring_register_buf_ring(&ring, ®, 0);
if (ret) {
/* by now should have checked if this is supported or not */
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
for (loop = 0; loop < loops; loop++) {
memset(buffers, 0, sizeof(bool) * entries);
for (idx = 0; idx < entries; idx++)
io_uring_buf_ring_add(br, buffer, sizeof(buffer), idx, ring_mask, idx);
io_uring_buf_ring_advance(br, entries);
for (idx = 0; idx < entries; idx++) {
memset(buffer, 1, sizeof(buffer));
ret = test_one_read(read_fd, bgid, &ring);
if (ret < 0) {
fprintf(stderr, "bad run %d/%d = %d\n", loop, idx, ret);
return ret;
}
if (buffers[ret]) {
fprintf(stderr, "reused buffer %d/%d = %d!\n", loop, idx, ret);
return 1;
}
if (buffer[0] != 0) {
fprintf(stderr, "unexpected read %d %d/%d = %d!\n",
(int)buffer[0], loop, idx, ret);
return 1;
}
if (buffer[1] != 1) {
fprintf(stderr, "unexpected spilled read %d %d/%d = %d!\n",
(int)buffer[1], loop, idx, ret);
return 1;
}
buffers[ret] = true;
}
ret = test_one_read(read_fd, bgid, &ring);
if (ret != -ENOBUFS) {
fprintf(stderr, "expected enobufs run %d = %d\n", loop, ret);
return 1;
}
}
ret = io_uring_unregister_buf_ring(&ring, bgid);
if (ret) {
fprintf(stderr, "Buffer ring register failed %d\n", ret);
return 1;
}
close(read_fd);
io_uring_queue_exit(&ring);
free(buffers);
return 0;
}
int main(int argc, char *argv[])
{
int bgids[] = { 1, 127, -1 };
int entries[] = {1, 32768, 4096, -1 };
int ret, i;
if (argc > 1)
return T_EXIT_SKIP;
for (i = 0; bgids[i] != -1; i++) {
ret = test_reg_unreg(bgids[i]);
if (ret) {
fprintf(stderr, "test_reg_unreg failed\n");
return T_EXIT_FAIL;
}
if (no_buf_ring)
break;
ret = test_bad_reg(bgids[i]);
if (ret) {
fprintf(stderr, "test_bad_reg failed\n");
return T_EXIT_FAIL;
}
ret = test_double_reg_unreg(bgids[i]);
if (ret) {
fprintf(stderr, "test_double_reg_unreg failed\n");
return T_EXIT_FAIL;
}
ret = test_mixed_reg(bgids[i]);
if (ret) {
fprintf(stderr, "test_mixed_reg failed\n");
return T_EXIT_FAIL;
}
ret = test_mixed_reg2(bgids[i]);
if (ret) {
fprintf(stderr, "test_mixed_reg2 failed\n");
return T_EXIT_FAIL;
}
}
for (i = 0; !no_buf_ring && entries[i] != -1; i++) {
ret = test_running(2, entries[i], 3);
if (ret) {
fprintf(stderr, "test_running(%d) failed\n", entries[i]);
return T_EXIT_FAIL;
}
}
return T_EXIT_PASS;
}
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