DPDK  20.11.3
examples/vhost_blk/vhost_blk_compat.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2019 Intel Corporation
*/
#ifndef _VHOST_BLK_COMPAT_H_
#define _VHOST_BLK_COMPAT_H_
#include <sys/uio.h>
#include <stdint.h>
#include <linux/virtio_blk.h>
#include <linux/virtio_ring.h>
#include <rte_vhost.h>
#include "vhost_blk.h"
#include "blk_spec.h"
#define VHOST_MAX_VQUEUES 256
#define SPDK_VHOST_MAX_VQ_SIZE 1024
#define VHOST_USER_GET_CONFIG 24
#define VHOST_USER_SET_CONFIG 25
static int
vhost_blk_get_config(struct vhost_block_dev *bdev, uint8_t *config,
uint32_t len)
{
struct virtio_blk_config blkcfg;
uint32_t blk_size;
uint64_t blkcnt;
if (bdev == NULL) {
/* We can't just return -1 here as this GET_CONFIG message might
* be caused by a QEMU VM reboot. Returning -1 will indicate an
* error to QEMU, who might then decide to terminate itself.
* We don't want that. A simple reboot shouldn't break the
* system.
*
* Presenting a block device with block size 0 and block count 0
* doesn't cause any problems on QEMU side and the virtio-pci
* device is even still available inside the VM, but there will
* be no block device created for it - the kernel drivers will
* silently reject it.
*/
blk_size = 0;
blkcnt = 0;
} else {
blk_size = bdev->blocklen;
blkcnt = bdev->blockcnt;
}
memset(&blkcfg, 0, sizeof(blkcfg));
blkcfg.blk_size = blk_size;
/* minimum I/O size in blocks */
blkcfg.min_io_size = 1;
/* expressed in 512 Bytes sectors */
blkcfg.capacity = (blkcnt * blk_size) / 512;
/* QEMU can overwrite this value when started */
blkcfg.num_queues = VHOST_MAX_VQUEUES;
fprintf(stdout, "block device:blk_size = %d, blkcnt = %"PRIx64"\n",
blk_size, blkcnt);
memcpy(config, &blkcfg, RTE_MIN(len, sizeof(blkcfg)));
return 0;
}
extern_vhost_pre_msg_handler(int vid, void *_msg)
{
char path[PATH_MAX];
struct vhost_blk_ctrlr *ctrlr;
struct vhost_user_msg *msg = _msg;
int ret;
ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
if (ret) {
fprintf(stderr, "Cannot get socket name\n");
return -1;
}
ctrlr = vhost_blk_ctrlr_find(path);
if (!ctrlr) {
fprintf(stderr, "Controller is not ready\n");
return -1;
}
switch ((int)msg->request) {
case VHOST_USER_GET_VRING_BASE:
case VHOST_USER_SET_VRING_BASE:
case VHOST_USER_SET_VRING_ADDR:
case VHOST_USER_SET_VRING_NUM:
case VHOST_USER_SET_VRING_KICK:
case VHOST_USER_SET_VRING_CALL:
case VHOST_USER_SET_MEM_TABLE:
break;
case VHOST_USER_GET_CONFIG: {
int rc = 0;
rc = vhost_blk_get_config(ctrlr->bdev,
msg->payload.cfg.region,
msg->payload.cfg.size);
if (rc != 0)
msg->size = 0;
return RTE_VHOST_MSG_RESULT_REPLY;
}
case VHOST_USER_SET_CONFIG:
default:
break;
}
return RTE_VHOST_MSG_RESULT_NOT_HANDLED;
}
extern_vhost_post_msg_handler(int vid, void *_msg)
{
char path[PATH_MAX];
struct vhost_blk_ctrlr *ctrlr;
struct vhost_user_msg *msg = _msg;
int ret;
ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
if (ret) {
fprintf(stderr, "Cannot get socket name\n");
return -1;
}
ctrlr = vhost_blk_ctrlr_find(path);
if (!ctrlr) {
fprintf(stderr, "Controller is not ready\n");
return -1;
}
switch (msg->request) {
case VHOST_USER_SET_FEATURES:
case VHOST_USER_SET_VRING_KICK:
default:
break;
}
return RTE_VHOST_MSG_RESULT_NOT_HANDLED;
}
struct rte_vhost_user_extern_ops g_extern_vhost_ops = {
.pre_msg_handle = extern_vhost_pre_msg_handler,
.post_msg_handle = extern_vhost_post_msg_handler,
};
void
vhost_session_install_rte_compat_hooks(uint32_t vid)
{
int rc;
rc = rte_vhost_extern_callback_register(vid, &g_extern_vhost_ops, NULL);
if (rc != 0)
fprintf(stderr,
"rte_vhost_extern_callback_register() failed for vid = %d\n",
vid);
}
void
vhost_dev_install_rte_compat_hooks(const char *path)
{
uint64_t protocol_features = 0;
rte_vhost_driver_get_protocol_features(path, &protocol_features);
protocol_features |= (1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
protocol_features |= (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD);
rte_vhost_driver_set_protocol_features(path, protocol_features);
}
#endif