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virtio_user_dev.c
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virtio_user_dev.c
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2016 Intel Corporation
*/
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/eventfd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <rte_string_fns.h>
#include <rte_eal_memconfig.h>
#include "vhost.h"
#include "virtio_user_dev.h"
#include "../virtio_ethdev.h"
#define VIRTIO_USER_MEM_EVENT_CLB_NAME "virtio_user_mem_event_clb"
const char * const virtio_user_backend_strings[] = {
[VIRTIO_USER_BACKEND_UNKNOWN] = "VIRTIO_USER_BACKEND_UNKNOWN",
[VIRTIO_USER_BACKEND_VHOST_USER] = "VHOST_USER",
[VIRTIO_USER_BACKEND_VHOST_KERNEL] = "VHOST_NET",
[VIRTIO_USER_BACKEND_VHOST_VDPA] = "VHOST_VDPA",
};
static int
virtio_user_create_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
{
/* Of all per virtqueue MSGs, make sure VHOST_SET_VRING_CALL come
* firstly because vhost depends on this msg to allocate virtqueue
* pair.
*/
struct vhost_vring_file file;
file.index = queue_sel;
file.fd = dev->callfds[queue_sel];
dev->ops->send_request(dev, VHOST_USER_SET_VRING_CALL, &file);
return 0;
}
static int
virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
{
struct vhost_vring_file file;
struct vhost_vring_state state;
struct vring *vring = &dev->vrings[queue_sel];
struct vring_packed *pq_vring = &dev->packed_vrings[queue_sel];
struct vhost_vring_addr addr = {
.index = queue_sel,
.log_guest_addr = 0,
.flags = 0, /* disable log */
};
if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
addr.desc_user_addr =
(uint64_t)(uintptr_t)pq_vring->desc;
addr.avail_user_addr =
(uint64_t)(uintptr_t)pq_vring->driver;
addr.used_user_addr =
(uint64_t)(uintptr_t)pq_vring->device;
} else {
addr.desc_user_addr = (uint64_t)(uintptr_t)vring->desc;
addr.avail_user_addr = (uint64_t)(uintptr_t)vring->avail;
addr.used_user_addr = (uint64_t)(uintptr_t)vring->used;
}
state.index = queue_sel;
state.num = vring->num;
dev->ops->send_request(dev, VHOST_USER_SET_VRING_NUM, &state);
state.index = queue_sel;
state.num = 0; /* no reservation */
if (dev->features & (1ULL << VIRTIO_F_RING_PACKED))
state.num |= (1 << 15);
dev->ops->send_request(dev, VHOST_USER_SET_VRING_BASE, &state);
dev->ops->send_request(dev, VHOST_USER_SET_VRING_ADDR, &addr);
/* Of all per virtqueue MSGs, make sure VHOST_USER_SET_VRING_KICK comes
* lastly because vhost depends on this msg to judge if
* virtio is ready.
*/
file.index = queue_sel;
file.fd = dev->kickfds[queue_sel];
dev->ops->send_request(dev, VHOST_USER_SET_VRING_KICK, &file);
return 0;
}
static int
virtio_user_queue_setup(struct virtio_user_dev *dev,
int (*fn)(struct virtio_user_dev *, uint32_t))
{
uint32_t i, queue_sel;
for (i = 0; i < dev->max_queue_pairs; ++i) {
queue_sel = 2 * i + VTNET_SQ_RQ_QUEUE_IDX;
if (fn(dev, queue_sel) < 0) {
PMD_DRV_LOG(INFO, "setup rx vq fails: %u", i);
return -1;
}
}
for (i = 0; i < dev->max_queue_pairs; ++i) {
queue_sel = 2 * i + VTNET_SQ_TQ_QUEUE_IDX;
if (fn(dev, queue_sel) < 0) {
PMD_DRV_LOG(INFO, "setup tx vq fails: %u", i);
return -1;
}
}
return 0;
}
int
virtio_user_dev_set_features(struct virtio_user_dev *dev)
{
uint64_t features;
int ret = -1;
pthread_mutex_lock(&dev->mutex);
if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER &&
dev->vhostfd < 0)
goto error;
/* Step 0: tell vhost to create queues */
if (virtio_user_queue_setup(dev, virtio_user_create_queue) < 0)
goto error;
features = dev->features;
/* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
features &= ~(1ull << VIRTIO_NET_F_MAC);
/* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
features &= ~(1ull << VIRTIO_NET_F_STATUS);
ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
if (ret < 0)
goto error;
PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
error:
pthread_mutex_unlock(&dev->mutex);
return ret;
}
int
virtio_user_start_device(struct virtio_user_dev *dev)
{
int ret;
/*
* XXX workaround!
*
* We need to make sure that the locks will be
* taken in the correct order to avoid deadlocks.
*
* Before releasing this lock, this thread should
* not trigger any memory hotplug events.
*
* This is a temporary workaround, and should be
* replaced when we get proper supports from the
* memory subsystem in the future.
*/
rte_mcfg_mem_read_lock();
pthread_mutex_lock(&dev->mutex);
if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER &&
dev->vhostfd < 0)
goto error;
/* Step 2: share memory regions */
ret = dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
if (ret < 0)
goto error;
/* Step 3: kick queues */
if (virtio_user_queue_setup(dev, virtio_user_kick_queue) < 0)
goto error;
/* Step 4: enable queues
* we enable the 1st queue pair by default.
*/
dev->ops->enable_qp(dev, 0, 1);
dev->started = true;
pthread_mutex_unlock(&dev->mutex);
rte_mcfg_mem_read_unlock();
return 0;
error:
pthread_mutex_unlock(&dev->mutex);
rte_mcfg_mem_read_unlock();
/* TODO: free resource here or caller to check */
return -1;
}
int virtio_user_stop_device(struct virtio_user_dev *dev)
{
struct vhost_vring_state state;
uint32_t i;
int error = 0;
pthread_mutex_lock(&dev->mutex);
if (!dev->started)
goto out;
for (i = 0; i < dev->max_queue_pairs; ++i)
dev->ops->enable_qp(dev, i, 0);
/* Stop the backend. */
for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
state.index = i;
if (dev->ops->send_request(dev, VHOST_USER_GET_VRING_BASE,
&state) < 0) {
PMD_DRV_LOG(ERR, "get_vring_base failed, index=%u\n",
i);
error = -1;
goto out;
}
}
dev->started = false;
out:
pthread_mutex_unlock(&dev->mutex);
return error;
}
static inline void
parse_mac(struct virtio_user_dev *dev, const char *mac)
{
struct rte_ether_addr tmp;
if (!mac)
return;
if (rte_ether_unformat_addr(mac, &tmp) == 0) {
memcpy(dev->mac_addr, &tmp, RTE_ETHER_ADDR_LEN);
dev->mac_specified = 1;
} else {
/* ignore the wrong mac, use random mac */
PMD_DRV_LOG(ERR, "wrong format of mac: %s", mac);
}
}
static int
virtio_user_dev_init_notify(struct virtio_user_dev *dev)
{
uint32_t i, j;
int callfd;
int kickfd;
for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
if (i >= dev->max_queue_pairs * 2) {
dev->kickfds[i] = -1;
dev->callfds[i] = -1;
continue;
}
/* May use invalid flag, but some backend uses kickfd and
* callfd as criteria to judge if dev is alive. so finally we
* use real event_fd.
*/
callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (callfd < 0) {
PMD_DRV_LOG(ERR, "callfd error, %s", strerror(errno));
break;
}
kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (kickfd < 0) {
close(callfd);
PMD_DRV_LOG(ERR, "kickfd error, %s", strerror(errno));
break;
}
dev->callfds[i] = callfd;
dev->kickfds[i] = kickfd;
}
if (i < VIRTIO_MAX_VIRTQUEUES) {
for (j = 0; j < i; ++j) {
close(dev->callfds[j]);
close(dev->kickfds[j]);
}
return -1;
}
return 0;
}
static int
virtio_user_fill_intr_handle(struct virtio_user_dev *dev)
{
uint32_t i;
struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->port_id];
if (!eth_dev->intr_handle) {
eth_dev->intr_handle = malloc(sizeof(*eth_dev->intr_handle));
if (!eth_dev->intr_handle) {
PMD_DRV_LOG(ERR, "fail to allocate intr_handle");
return -1;
}
memset(eth_dev->intr_handle, 0, sizeof(*eth_dev->intr_handle));
}
for (i = 0; i < dev->max_queue_pairs; ++i)
eth_dev->intr_handle->efds[i] = dev->callfds[i];
eth_dev->intr_handle->nb_efd = dev->max_queue_pairs;
eth_dev->intr_handle->max_intr = dev->max_queue_pairs + 1;
eth_dev->intr_handle->type = RTE_INTR_HANDLE_VDEV;
/* For virtio vdev, no need to read counter for clean */
eth_dev->intr_handle->efd_counter_size = 0;
eth_dev->intr_handle->fd = -1;
if (dev->vhostfd >= 0)
eth_dev->intr_handle->fd = dev->vhostfd;
else if (dev->is_server)
eth_dev->intr_handle->fd = dev->listenfd;
return 0;
}
static void
virtio_user_mem_event_cb(enum rte_mem_event type __rte_unused,
const void *addr,
size_t len __rte_unused,
void *arg)
{
struct virtio_user_dev *dev = arg;
struct rte_memseg_list *msl;
uint16_t i;
/* ignore externally allocated memory */
msl = rte_mem_virt2memseg_list(addr);
if (msl->external)
return;
pthread_mutex_lock(&dev->mutex);
if (dev->started == false)
goto exit;
/* Step 1: pause the active queues */
for (i = 0; i < dev->queue_pairs; i++)
dev->ops->enable_qp(dev, i, 0);
/* Step 2: update memory regions */
dev->ops->send_request(dev, VHOST_USER_SET_MEM_TABLE, NULL);
/* Step 3: resume the active queues */
for (i = 0; i < dev->queue_pairs; i++)
dev->ops->enable_qp(dev, i, 1);
exit:
pthread_mutex_unlock(&dev->mutex);
}
static int
virtio_user_dev_setup(struct virtio_user_dev *dev)
{
uint32_t q;
dev->vhostfd = -1;
dev->vhostfds = NULL;
dev->tapfds = NULL;
if (dev->is_server) {
if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER) {
PMD_DRV_LOG(ERR, "Server mode only supports vhost-user!");
return -1;
}
dev->ops = &virtio_ops_user;
} else {
if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER) {
dev->ops = &virtio_ops_user;
} else if (dev->backend_type ==
VIRTIO_USER_BACKEND_VHOST_KERNEL) {
dev->ops = &virtio_ops_kernel;
dev->vhostfds = malloc(dev->max_queue_pairs *
sizeof(int));
dev->tapfds = malloc(dev->max_queue_pairs *
sizeof(int));
if (!dev->vhostfds || !dev->tapfds) {
PMD_INIT_LOG(ERR, "Failed to malloc");
return -1;
}
for (q = 0; q < dev->max_queue_pairs; ++q) {
dev->vhostfds[q] = -1;
dev->tapfds[q] = -1;
}
} else if (dev->backend_type ==
VIRTIO_USER_BACKEND_VHOST_VDPA) {
dev->ops = &virtio_ops_vdpa;
} else {
PMD_DRV_LOG(ERR, "Unknown backend type");
return -1;
}
}
if (dev->ops->setup(dev) < 0)
return -1;
if (virtio_user_dev_init_notify(dev) < 0)
return -1;
if (virtio_user_fill_intr_handle(dev) < 0)
return -1;
return 0;
}
/* Use below macro to filter features from vhost backend */
#define VIRTIO_USER_SUPPORTED_FEATURES \
(1ULL << VIRTIO_NET_F_MAC | \
1ULL << VIRTIO_NET_F_STATUS | \
1ULL << VIRTIO_NET_F_MQ | \
1ULL << VIRTIO_NET_F_CTRL_MAC_ADDR | \
1ULL << VIRTIO_NET_F_CTRL_VQ | \
1ULL << VIRTIO_NET_F_CTRL_RX | \
1ULL << VIRTIO_NET_F_CTRL_VLAN | \
1ULL << VIRTIO_NET_F_CSUM | \
1ULL << VIRTIO_NET_F_HOST_TSO4 | \
1ULL << VIRTIO_NET_F_HOST_TSO6 | \
1ULL << VIRTIO_NET_F_MRG_RXBUF | \
1ULL << VIRTIO_RING_F_INDIRECT_DESC | \
1ULL << VIRTIO_NET_F_GUEST_CSUM | \
1ULL << VIRTIO_NET_F_GUEST_TSO4 | \
1ULL << VIRTIO_NET_F_GUEST_TSO6 | \
1ULL << VIRTIO_F_IN_ORDER | \
1ULL << VIRTIO_F_VERSION_1 | \
1ULL << VIRTIO_F_RING_PACKED | \
1ULL << VHOST_USER_F_PROTOCOL_FEATURES)
#define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES \
(1ULL << VHOST_USER_PROTOCOL_F_MQ | \
1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK | \
1ULL << VHOST_USER_PROTOCOL_F_STATUS)
int
virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
int cq, int queue_size, const char *mac, char **ifname,
int server, int mrg_rxbuf, int in_order, int packed_vq,
enum virtio_user_backend_type backend_type)
{
uint64_t protocol_features = 0;
pthread_mutex_init(&dev->mutex, NULL);
strlcpy(dev->path, path, PATH_MAX);
dev->started = 0;
dev->max_queue_pairs = queues;
dev->queue_pairs = 1; /* mq disabled by default */
dev->queue_size = queue_size;
dev->is_server = server;
dev->mac_specified = 0;
dev->frontend_features = 0;
dev->unsupported_features = ~VIRTIO_USER_SUPPORTED_FEATURES;
dev->protocol_features = VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES;
dev->backend_type = backend_type;
parse_mac(dev, mac);
if (*ifname) {
dev->ifname = *ifname;
*ifname = NULL;
}
if (virtio_user_dev_setup(dev) < 0) {
PMD_INIT_LOG(ERR, "backend set up fails");
return -1;
}
if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER)
dev->unsupported_features |=
(1ULL << VHOST_USER_F_PROTOCOL_FEATURES);
if (!dev->is_server) {
if (dev->ops->send_request(dev, VHOST_USER_SET_OWNER,
NULL) < 0) {
PMD_INIT_LOG(ERR, "set_owner fails: %s",
strerror(errno));
return -1;
}
if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
&dev->device_features) < 0) {
PMD_INIT_LOG(ERR, "get_features failed: %s",
strerror(errno));
return -1;
}
if (dev->device_features &
(1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) {
if (dev->ops->send_request(dev,
VHOST_USER_GET_PROTOCOL_FEATURES,
&protocol_features))
return -1;
dev->protocol_features &= protocol_features;
if (dev->ops->send_request(dev,
VHOST_USER_SET_PROTOCOL_FEATURES,
&dev->protocol_features))
return -1;
if (!(dev->protocol_features &
(1ULL << VHOST_USER_PROTOCOL_F_MQ)))
dev->unsupported_features |=
(1ull << VIRTIO_NET_F_MQ);
}
} else {
/* We just pretend vhost-user can support all these features.
* Note that this could be problematic that if some feature is
* negotiated but not supported by the vhost-user which comes
* later.
*/
dev->device_features = VIRTIO_USER_SUPPORTED_FEATURES;
/* We cannot assume VHOST_USER_PROTOCOL_F_STATUS is supported
* until it's negotiated
*/
dev->protocol_features &=
~(1ULL << VHOST_USER_PROTOCOL_F_STATUS);
}
if (!mrg_rxbuf)
dev->unsupported_features |= (1ull << VIRTIO_NET_F_MRG_RXBUF);
if (!in_order)
dev->unsupported_features |= (1ull << VIRTIO_F_IN_ORDER);
if (!packed_vq)
dev->unsupported_features |= (1ull << VIRTIO_F_RING_PACKED);
if (dev->mac_specified)
dev->frontend_features |= (1ull << VIRTIO_NET_F_MAC);
else
dev->unsupported_features |= (1ull << VIRTIO_NET_F_MAC);
if (cq) {
/* device does not really need to know anything about CQ,
* so if necessary, we just claim to support CQ
*/
dev->frontend_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
} else {
dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VQ);
/* Also disable features that depend on VIRTIO_NET_F_CTRL_VQ */
dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_RX);
dev->unsupported_features |= (1ull << VIRTIO_NET_F_CTRL_VLAN);
dev->unsupported_features |=
(1ull << VIRTIO_NET_F_GUEST_ANNOUNCE);
dev->unsupported_features |= (1ull << VIRTIO_NET_F_MQ);
dev->unsupported_features |=
(1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
}
/* The backend will not report this feature, we add it explicitly */
if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS);
/*
* Device features =
* (frontend_features | backend_features) & ~unsupported_features;
*/
dev->device_features |= dev->frontend_features;
dev->device_features &= ~dev->unsupported_features;
if (rte_mem_event_callback_register(VIRTIO_USER_MEM_EVENT_CLB_NAME,
virtio_user_mem_event_cb, dev)) {
if (rte_errno != ENOTSUP) {
PMD_INIT_LOG(ERR, "Failed to register mem event"
" callback\n");
return -1;
}
}
return 0;
}
void
virtio_user_dev_uninit(struct virtio_user_dev *dev)
{
uint32_t i;
virtio_user_stop_device(dev);
rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
close(dev->callfds[i]);
close(dev->kickfds[i]);
}
if (dev->vhostfd >= 0)
close(dev->vhostfd);
if (dev->is_server && dev->listenfd >= 0) {
close(dev->listenfd);
dev->listenfd = -1;
}
if (dev->vhostfds) {
for (i = 0; i < dev->max_queue_pairs; ++i) {
close(dev->vhostfds[i]);
if (dev->tapfds[i] >= 0)
close(dev->tapfds[i]);
}
free(dev->vhostfds);
free(dev->tapfds);
}
free(dev->ifname);
if (dev->is_server)
unlink(dev->path);
}
uint8_t
virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs)
{
uint16_t i;
uint8_t ret = 0;
if (q_pairs > dev->max_queue_pairs) {
PMD_INIT_LOG(ERR, "multi-q config %u, but only %u supported",
q_pairs, dev->max_queue_pairs);
return -1;
}
/* Server mode can't enable queue pairs if vhostfd is invalid,
* always return 0 in this case.
*/
if (!dev->is_server || dev->vhostfd >= 0) {
for (i = 0; i < q_pairs; ++i)
ret |= dev->ops->enable_qp(dev, i, 1);
for (i = q_pairs; i < dev->max_queue_pairs; ++i)
ret |= dev->ops->enable_qp(dev, i, 0);
}
dev->queue_pairs = q_pairs;
return ret;
}
static uint32_t
virtio_user_handle_ctrl_msg(struct virtio_user_dev *dev, struct vring *vring,
uint16_t idx_hdr)
{
struct virtio_net_ctrl_hdr *hdr;
virtio_net_ctrl_ack status = ~0;
uint16_t i, idx_data, idx_status;
uint32_t n_descs = 0;
/* locate desc for header, data, and status */
idx_data = vring->desc[idx_hdr].next;
n_descs++;
i = idx_data;
while (vring->desc[i].flags == VRING_DESC_F_NEXT) {
i = vring->desc[i].next;
n_descs++;
}
/* locate desc for status */
idx_status = i;
n_descs++;
hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
if (hdr->class == VIRTIO_NET_CTRL_MQ &&
hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
uint16_t queues;
queues = *(uint16_t *)(uintptr_t)vring->desc[idx_data].addr;
status = virtio_user_handle_mq(dev, queues);
} else if (hdr->class == VIRTIO_NET_CTRL_RX ||
hdr->class == VIRTIO_NET_CTRL_MAC ||
hdr->class == VIRTIO_NET_CTRL_VLAN) {
status = 0;
}
/* Update status */
*(virtio_net_ctrl_ack *)(uintptr_t)vring->desc[idx_status].addr = status;
return n_descs;
}
static inline int
desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
{
uint16_t flags = __atomic_load_n(&desc->flags, __ATOMIC_ACQUIRE);
return wrap_counter == !!(flags & VRING_PACKED_DESC_F_AVAIL) &&
wrap_counter != !!(flags & VRING_PACKED_DESC_F_USED);
}
static uint32_t
virtio_user_handle_ctrl_msg_packed(struct virtio_user_dev *dev,
struct vring_packed *vring,
uint16_t idx_hdr)
{
struct virtio_net_ctrl_hdr *hdr;
virtio_net_ctrl_ack status = ~0;
uint16_t idx_data, idx_status;
/* initialize to one, header is first */
uint32_t n_descs = 1;
/* locate desc for header, data, and status */
idx_data = idx_hdr + 1;
if (idx_data >= dev->queue_size)
idx_data -= dev->queue_size;
n_descs++;
idx_status = idx_data;
while (vring->desc[idx_status].flags & VRING_DESC_F_NEXT) {
idx_status++;
if (idx_status >= dev->queue_size)
idx_status -= dev->queue_size;
n_descs++;
}
hdr = (void *)(uintptr_t)vring->desc[idx_hdr].addr;
if (hdr->class == VIRTIO_NET_CTRL_MQ &&
hdr->cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
uint16_t queues;
queues = *(uint16_t *)(uintptr_t)
vring->desc[idx_data].addr;
status = virtio_user_handle_mq(dev, queues);
} else if (hdr->class == VIRTIO_NET_CTRL_RX ||
hdr->class == VIRTIO_NET_CTRL_MAC ||
hdr->class == VIRTIO_NET_CTRL_VLAN) {
status = 0;
}
/* Update status */
*(virtio_net_ctrl_ack *)(uintptr_t)
vring->desc[idx_status].addr = status;
/* Update used descriptor */
vring->desc[idx_hdr].id = vring->desc[idx_status].id;
vring->desc[idx_hdr].len = sizeof(status);
return n_descs;
}
void
virtio_user_handle_cq_packed(struct virtio_user_dev *dev, uint16_t queue_idx)
{
struct virtio_user_queue *vq = &dev->packed_queues[queue_idx];
struct vring_packed *vring = &dev->packed_vrings[queue_idx];
uint16_t n_descs, flags;
/* Perform a load-acquire barrier in desc_is_avail to
* enforce the ordering between desc flags and desc
* content.
*/
while (desc_is_avail(&vring->desc[vq->used_idx],
vq->used_wrap_counter)) {
n_descs = virtio_user_handle_ctrl_msg_packed(dev, vring,
vq->used_idx);
flags = VRING_DESC_F_WRITE;
if (vq->used_wrap_counter)
flags |= VRING_PACKED_DESC_F_AVAIL_USED;
__atomic_store_n(&vring->desc[vq->used_idx].flags, flags,
__ATOMIC_RELEASE);
vq->used_idx += n_descs;
if (vq->used_idx >= dev->queue_size) {
vq->used_idx -= dev->queue_size;
vq->used_wrap_counter ^= 1;
}
}
}
void
virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
{
uint16_t avail_idx, desc_idx;
struct vring_used_elem *uep;
uint32_t n_descs;
struct vring *vring = &dev->vrings[queue_idx];
/* Consume avail ring, using used ring idx as first one */
while (__atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
!= vring->avail->idx) {
avail_idx = __atomic_load_n(&vring->used->idx, __ATOMIC_RELAXED)
& (vring->num - 1);
desc_idx = vring->avail->ring[avail_idx];
n_descs = virtio_user_handle_ctrl_msg(dev, vring, desc_idx);
/* Update used ring */
uep = &vring->used->ring[avail_idx];
uep->id = desc_idx;
uep->len = n_descs;
__atomic_add_fetch(&vring->used->idx, 1, __ATOMIC_RELAXED);
}
}
int
virtio_user_dev_set_status(struct virtio_user_dev *dev, uint8_t status)
{
int ret;
uint64_t arg = status;
pthread_mutex_lock(&dev->mutex);
dev->status = status;
if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
ret = dev->ops->send_request(dev,
VHOST_USER_SET_STATUS, &arg);
else if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_VDPA)
ret = dev->ops->send_request(dev,
VHOST_USER_SET_STATUS, &status);
else
ret = -ENOTSUP;
if (ret && ret != -ENOTSUP) {
PMD_INIT_LOG(ERR, "VHOST_USER_SET_STATUS failed (%d): %s", ret,
strerror(errno));
}
pthread_mutex_unlock(&dev->mutex);
return ret;
}
int
virtio_user_dev_update_status(struct virtio_user_dev *dev)
{
uint64_t ret;
uint8_t status;
int err;
pthread_mutex_lock(&dev->mutex);
if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER) {
err = dev->ops->send_request(dev, VHOST_USER_GET_STATUS, &ret);
if (!err && ret > UINT8_MAX) {
PMD_INIT_LOG(ERR, "Invalid VHOST_USER_GET_STATUS "
"response 0x%" PRIx64 "\n", ret);
err = -1;
goto error;
}
status = ret;
} else if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_VDPA) {
err = dev->ops->send_request(dev, VHOST_USER_GET_STATUS,
&status);
} else {
err = -ENOTSUP;
}
if (!err) {
dev->status = status;
PMD_INIT_LOG(DEBUG, "Updated Device Status(0x%08x):\n"
"\t-RESET: %u\n"
"\t-ACKNOWLEDGE: %u\n"
"\t-DRIVER: %u\n"
"\t-DRIVER_OK: %u\n"
"\t-FEATURES_OK: %u\n"
"\t-DEVICE_NEED_RESET: %u\n"
"\t-FAILED: %u\n",
dev->status,
(dev->status == VIRTIO_CONFIG_STATUS_RESET),
!!(dev->status & VIRTIO_CONFIG_STATUS_ACK),
!!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER),
!!(dev->status & VIRTIO_CONFIG_STATUS_DRIVER_OK),
!!(dev->status & VIRTIO_CONFIG_STATUS_FEATURES_OK),
!!(dev->status & VIRTIO_CONFIG_STATUS_DEV_NEED_RESET),
!!(dev->status & VIRTIO_CONFIG_STATUS_FAILED));
} else if (err != -ENOTSUP) {
PMD_INIT_LOG(ERR, "VHOST_USER_GET_STATUS failed (%d): %s", err,
strerror(errno));
}
error:
pthread_mutex_unlock(&dev->mutex);
return err;
}