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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_alarm.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;
int ret;
file.index = queue_sel;
file.fd = dev->callfds[queue_sel];
ret = dev->ops->set_vring_call(dev, &file);
if (ret < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to create queue %u", dev->path, queue_sel);
return -1;
}
return 0;
}
static int
virtio_user_kick_queue(struct virtio_user_dev *dev, uint32_t queue_sel)
{
int ret;
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;
ret = dev->ops->set_vring_num(dev, &state);
if (ret < 0)
goto err;
state.index = queue_sel;
state.num = 0; /* no reservation */
if (dev->features & (1ULL << VIRTIO_F_RING_PACKED))
state.num |= (1 << 15);
ret = dev->ops->set_vring_base(dev, &state);
if (ret < 0)
goto err;
ret = dev->ops->set_vring_addr(dev, &addr);
if (ret < 0)
goto err;
/* 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];
ret = dev->ops->set_vring_kick(dev, &file);
if (ret < 0)
goto err;
return 0;
err:
PMD_INIT_LOG(ERR, "(%s) Failed to kick queue %u", dev->path, queue_sel);
return -1;
}
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(ERR, "(%s) setup rx vq %u failed", dev->path, 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, "(%s) setup tx vq %u failed", dev->path, 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);
/* 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->set_features(dev, features);
if (ret < 0)
goto error;
PMD_DRV_LOG(INFO, "(%s) set features: 0x%" PRIx64, dev->path, 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);
/* Step 2: share memory regions */
ret = dev->ops->set_memory_table(dev);
if (ret < 0)
goto error;
/* Step 3: kick queues */
ret = virtio_user_queue_setup(dev, virtio_user_kick_queue);
if (ret < 0)
goto error;
/* Step 4: enable queues
* we enable the 1st queue pair by default.
*/
ret = dev->ops->enable_qp(dev, 0, 1);
if (ret < 0)
goto error;
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();
PMD_INIT_LOG(ERR, "(%s) Failed to start device", dev->path);
/* 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 ret;
pthread_mutex_lock(&dev->mutex);
if (!dev->started)
goto out;
for (i = 0; i < dev->max_queue_pairs; ++i) {
ret = dev->ops->enable_qp(dev, i, 0);
if (ret < 0)
goto err;
}
/* Stop the backend. */
for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
state.index = i;
ret = dev->ops->get_vring_base(dev, &state);
if (ret < 0) {
PMD_DRV_LOG(ERR, "(%s) get_vring_base failed, index=%u", dev->path, i);
goto err;
}
}
dev->started = false;
out:
pthread_mutex_unlock(&dev->mutex);
return 0;
err:
pthread_mutex_unlock(&dev->mutex);
PMD_INIT_LOG(ERR, "(%s) Failed to stop device", dev->path);
return -1;
}
int
virtio_user_dev_set_mac(struct virtio_user_dev *dev)
{
int ret = 0;
if (!(dev->device_features & (1ULL << VIRTIO_NET_F_MAC)))
return -ENOTSUP;
if (!dev->ops->set_config)
return -ENOTSUP;
ret = dev->ops->set_config(dev, dev->mac_addr,
offsetof(struct virtio_net_config, mac),
RTE_ETHER_ADDR_LEN);
if (ret)
PMD_DRV_LOG(ERR, "(%s) Failed to set MAC address in device", dev->path);
return ret;
}
int
virtio_user_dev_get_mac(struct virtio_user_dev *dev)
{
int ret = 0;
if (!(dev->device_features & (1ULL << VIRTIO_NET_F_MAC)))
return -ENOTSUP;
if (!dev->ops->get_config)
return -ENOTSUP;
ret = dev->ops->get_config(dev, dev->mac_addr,
offsetof(struct virtio_net_config, mac),
RTE_ETHER_ADDR_LEN);
if (ret)
PMD_DRV_LOG(ERR, "(%s) Failed to get MAC address from device", dev->path);
return ret;
}
static void
virtio_user_dev_init_mac(struct virtio_user_dev *dev, const char *mac)
{
struct rte_ether_addr cmdline_mac;
char buf[RTE_ETHER_ADDR_FMT_SIZE];
int ret;
if (mac && rte_ether_unformat_addr(mac, &cmdline_mac) == 0) {
/*
* MAC address was passed from command-line, try to store
* it in the device if it supports it. Otherwise try to use
* the device one.
*/
memcpy(dev->mac_addr, &cmdline_mac, RTE_ETHER_ADDR_LEN);
dev->mac_specified = 1;
/* Setting MAC may fail, continue to get the device one in this case */
virtio_user_dev_set_mac(dev);
ret = virtio_user_dev_get_mac(dev);
if (ret == -ENOTSUP)
goto out;
if (memcmp(&cmdline_mac, dev->mac_addr, RTE_ETHER_ADDR_LEN))
PMD_DRV_LOG(INFO, "(%s) Device MAC update failed", dev->path);
} else {
ret = virtio_user_dev_get_mac(dev);
if (ret) {
PMD_DRV_LOG(ERR, "(%s) No valid MAC in devargs or device, use random",
dev->path);
return;
}
dev->mac_specified = 1;
}
out:
rte_ether_format_addr(buf, RTE_ETHER_ADDR_FMT_SIZE,
(struct rte_ether_addr *)dev->mac_addr);
PMD_DRV_LOG(INFO, "(%s) MAC %s specified", dev->path, buf);
}
static int
virtio_user_dev_init_notify(struct virtio_user_dev *dev)
{
uint32_t i, j;
int callfd;
int kickfd;
for (i = 0; i < dev->max_queue_pairs * 2; i++) {
/* 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, "(%s) callfd error, %s", dev->path, strerror(errno));
goto err;
}
kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (kickfd < 0) {
close(callfd);
PMD_DRV_LOG(ERR, "(%s) kickfd error, %s", dev->path, strerror(errno));
goto err;
}
dev->callfds[i] = callfd;
dev->kickfds[i] = kickfd;
}
return 0;
err:
for (j = 0; j < i; j++) {
if (dev->kickfds[j] >= 0) {
close(dev->kickfds[j]);
dev->kickfds[j] = -1;
}
if (dev->callfds[j] >= 0) {
close(dev->callfds[j]);
dev->callfds[j] = -1;
}
}
return -1;
}
static void
virtio_user_dev_uninit_notify(struct virtio_user_dev *dev)
{
uint32_t i;
for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
if (dev->kickfds[i] >= 0) {
close(dev->kickfds[i]);
dev->kickfds[i] = -1;
}
if (dev->callfds[i] >= 0) {
close(dev->callfds[i]);
dev->callfds[i] = -1;
}
}
}
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->hw.port_id];
if (eth_dev->intr_handle == NULL) {
eth_dev->intr_handle =
rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_PRIVATE);
if (eth_dev->intr_handle == NULL) {
PMD_DRV_LOG(ERR, "(%s) failed to allocate intr_handle", dev->path);
return -1;
}
}
for (i = 0; i < dev->max_queue_pairs; ++i) {
if (rte_intr_efds_index_set(eth_dev->intr_handle, i,
dev->callfds[2 * i + VTNET_SQ_RQ_QUEUE_IDX]))
return -rte_errno;
}
if (rte_intr_nb_efd_set(eth_dev->intr_handle, dev->max_queue_pairs))
return -rte_errno;
if (rte_intr_max_intr_set(eth_dev->intr_handle,
dev->max_queue_pairs + 1))
return -rte_errno;
if (rte_intr_type_set(eth_dev->intr_handle, RTE_INTR_HANDLE_VDEV))
return -rte_errno;
/* For virtio vdev, no need to read counter for clean */
if (rte_intr_efd_counter_size_set(eth_dev->intr_handle, 0))
return -rte_errno;
if (rte_intr_fd_set(eth_dev->intr_handle, dev->ops->get_intr_fd(dev)))
return -rte_errno;
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;
int ret = 0;
/* 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++) {
ret = dev->ops->enable_qp(dev, i, 0);
if (ret < 0)
goto exit;
}
/* Step 2: update memory regions */
ret = dev->ops->set_memory_table(dev);
if (ret < 0)
goto exit;
/* Step 3: resume the active queues */
for (i = 0; i < dev->queue_pairs; i++) {
ret = dev->ops->enable_qp(dev, i, 1);
if (ret < 0)
goto exit;
}
exit:
pthread_mutex_unlock(&dev->mutex);
if (ret < 0)
PMD_DRV_LOG(ERR, "(%s) Failed to update memory table", dev->path);
}
static int
virtio_user_dev_setup(struct virtio_user_dev *dev)
{
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;
}
}
switch (dev->backend_type) {
case VIRTIO_USER_BACKEND_VHOST_USER:
dev->ops = &virtio_ops_user;
break;
case VIRTIO_USER_BACKEND_VHOST_KERNEL:
dev->ops = &virtio_ops_kernel;
break;
case VIRTIO_USER_BACKEND_VHOST_VDPA:
dev->ops = &virtio_ops_vdpa;
break;
default:
PMD_DRV_LOG(ERR, "(%s) Unknown backend type", dev->path);
return -1;
}
if (dev->ops->setup(dev) < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to setup backend", dev->path);
return -1;
}
if (virtio_user_dev_init_notify(dev) < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to init notifiers", dev->path);
goto destroy;
}
if (virtio_user_fill_intr_handle(dev) < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to init interrupt handler", dev->path);
goto uninit;
}
return 0;
uninit:
virtio_user_dev_uninit_notify(dev);
destroy:
dev->ops->destroy(dev);
return -1;
}
/* 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)
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 backend_features;
int i;
pthread_mutex_init(&dev->mutex, NULL);
strlcpy(dev->path, path, PATH_MAX);
for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; i++) {
dev->kickfds[i] = -1;
dev->callfds[i] = -1;
}
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 = 0;
dev->backend_type = backend_type;
if (*ifname) {
dev->ifname = *ifname;
*ifname = NULL;
}
if (virtio_user_dev_setup(dev) < 0) {
PMD_INIT_LOG(ERR, "(%s) backend set up fails", dev->path);
return -1;
}
if (dev->ops->set_owner(dev) < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to set backend owner", dev->path);
return -1;
}
if (dev->ops->get_backend_features(&backend_features) < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to get backend features", dev->path);
return -1;
}
dev->unsupported_features = ~(VIRTIO_USER_SUPPORTED_FEATURES | backend_features);
if (dev->ops->get_features(dev, &dev->device_features) < 0) {
PMD_INIT_LOG(ERR, "(%s) Failed to get device features", dev->path);
return -1;
}
virtio_user_dev_init_mac(dev, mac);
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);
dev->frontend_features &= ~dev->unsupported_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, "(%s) Failed to register mem event callback",
dev->path);
return -1;
}
}
return 0;
}
void
virtio_user_dev_uninit(struct virtio_user_dev *dev)
{
struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
rte_intr_instance_free(eth_dev->intr_handle);
eth_dev->intr_handle = NULL;
virtio_user_stop_device(dev);
rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
virtio_user_dev_uninit_notify(dev);
free(dev->ifname);
if (dev->is_server)
unlink(dev->path);
dev->ops->destroy(dev);
}
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, "(%s) multi-q config %u, but only %u supported",
dev->path, q_pairs, dev->max_queue_pairs);
return -1;
}
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;
pthread_mutex_lock(&dev->mutex);
dev->status = status;
ret = dev->ops->set_status(dev, status);
if (ret && ret != -ENOTSUP)
PMD_INIT_LOG(ERR, "(%s) Failed to set backend status", dev->path);
pthread_mutex_unlock(&dev->mutex);
return ret;
}
int
virtio_user_dev_update_status(struct virtio_user_dev *dev)
{
int ret;
uint8_t status;
pthread_mutex_lock(&dev->mutex);
ret = dev->ops->get_status(dev, &status);
if (!ret) {
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",
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 (ret != -ENOTSUP) {
PMD_INIT_LOG(ERR, "(%s) Failed to get backend status", dev->path);
}
pthread_mutex_unlock(&dev->mutex);
return ret;
}
int
virtio_user_dev_update_link_state(struct virtio_user_dev *dev)
{
if (dev->ops->update_link_state)
return dev->ops->update_link_state(dev);
return 0;
}
static void
virtio_user_dev_reset_queues_packed(struct rte_eth_dev *eth_dev)
{
struct virtio_user_dev *dev = eth_dev->data->dev_private;
struct virtio_hw *hw = &dev->hw;
struct virtnet_rx *rxvq;
struct virtnet_tx *txvq;
uint16_t i;
/* Add lock to avoid queue contention. */
rte_spinlock_lock(&hw->state_lock);
hw->started = 0;
/*
* Waiting for datapath to complete before resetting queues.
* 1 ms should be enough for the ongoing Tx/Rx function to finish.
*/
rte_delay_ms(1);
/* Vring reset for each Tx queue and Rx queue. */
for (i = 0; i < eth_dev->data->nb_rx_queues; i++) {
rxvq = eth_dev->data->rx_queues[i];
virtqueue_rxvq_reset_packed(virtnet_rxq_to_vq(rxvq));
virtio_dev_rx_queue_setup_finish(eth_dev, i);
}
for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
txvq = eth_dev->data->tx_queues[i];
virtqueue_txvq_reset_packed(virtnet_txq_to_vq(txvq));
}
hw->started = 1;
rte_spinlock_unlock(&hw->state_lock);
}
void
virtio_user_dev_delayed_disconnect_handler(void *param)
{
struct virtio_user_dev *dev = param;
struct rte_eth_dev *eth_dev = &rte_eth_devices[dev->hw.port_id];
if (rte_intr_disable(eth_dev->intr_handle) < 0) {
PMD_DRV_LOG(ERR, "interrupt disable failed");
return;
}
PMD_DRV_LOG(DEBUG, "Unregistering intr fd: %d",
rte_intr_fd_get(eth_dev->intr_handle));
if (rte_intr_callback_unregister(eth_dev->intr_handle,
virtio_interrupt_handler,
eth_dev) != 1)
PMD_DRV_LOG(ERR, "interrupt unregister failed");
if (dev->is_server) {
if (dev->ops->server_disconnect)
dev->ops->server_disconnect(dev);
rte_intr_fd_set(eth_dev->intr_handle,
dev->ops->get_intr_fd(dev));
PMD_DRV_LOG(DEBUG, "Registering intr fd: %d",
rte_intr_fd_get(eth_dev->intr_handle));
if (rte_intr_callback_register(eth_dev->intr_handle,
virtio_interrupt_handler,
eth_dev))
PMD_DRV_LOG(ERR, "interrupt register failed");
if (rte_intr_enable(eth_dev->intr_handle) < 0) {
PMD_DRV_LOG(ERR, "interrupt enable failed");
return;