numam-spdk/lib/rte_vhost/vhost_user.c

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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/mman.h>
#include <asm/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numaif.h>
#endif
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_log.h>
#include "vhost.h"
#include "vhost_user.h"
#define VIRTIO_MIN_MTU 68
#define VIRTIO_MAX_MTU 65535
static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_NONE] = "VHOST_USER_NONE",
[VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
[VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
[VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
[VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
[VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
[VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
[VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
[VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
[VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
[VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
[VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
[VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
[VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
[VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR",
[VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES",
[VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES",
[VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM",
[VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
[VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP",
[VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU",
[VHOST_USER_GET_CONFIG] = "VHOST_USER_GET_CONFIG",
[VHOST_USER_SET_CONFIG] = "VHOST_USER_SET_CONFIG",
[VHOST_USER_NVME_ADMIN] = "VHOST_USER_NVME_ADMIN",
[VHOST_USER_NVME_SET_CQ_CALL] = "VHOST_USER_NVME_SET_CQ_CALL",
[VHOST_USER_NVME_GET_CAP] = "VHOST_USER_NVME_GET_CAP",
[VHOST_USER_NVME_START_STOP] = "VHOST_USER_NVME_START_STOP",
[VHOST_USER_NVME_SET_BAR_MR] = "VHOST_USER_NVME_SET_BAR_MR"
};
static uint64_t
get_blk_size(int fd)
{
struct stat stat;
int ret;
ret = fstat(fd, &stat);
return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
}
static void
free_mem_region(struct virtio_net *dev)
{
uint32_t i;
struct rte_vhost_mem_region *reg;
if (!dev || !dev->mem)
return;
for (i = 0; i < dev->mem->nregions; i++) {
reg = &dev->mem->regions[i];
if (reg->host_user_addr) {
munmap(reg->mmap_addr, reg->mmap_size);
close(reg->fd);
}
}
}
void
vhost_backend_cleanup(struct virtio_net *dev)
{
uint32_t i;
if (dev->has_new_mem_table) {
for (i = 0; i < dev->mem_table.nregions; i++) {
close(dev->mem_table_fds[i]);
}
dev->has_new_mem_table = 0;
}
if (dev->mem) {
free_mem_region(dev);
rte_free(dev->mem);
dev->mem = NULL;
}
free(dev->guest_pages);
dev->guest_pages = NULL;
if (dev->log_addr) {
munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
dev->log_addr = 0;
}
if (dev->bar_addr) {
munmap((void *)(uintptr_t)dev->bar_addr, dev->bar_size);
dev->bar_addr = NULL;
dev->bar_size = 0;
}
}
/*
* This function just returns success at the moment unless
* the device hasn't been initialised.
*/
static int
vhost_user_set_owner(void)
{
return 0;
}
static int
vhost_user_reset_owner(struct virtio_net *dev)
{
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
cleanup_device(dev, 0);
reset_device(dev);
return 0;
}
/*
* The features that we support are requested.
*/
static uint64_t
vhost_user_get_features(struct virtio_net *dev)
{
return dev->features;
}
/*
* We receive the negotiated features supported by us and the virtio device.
*/
static int
vhost_user_set_features(struct virtio_net *dev, uint64_t features)
{
uint64_t vhost_features = 0;
vhost_features = vhost_user_get_features(dev);
if (features & ~vhost_features) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) received invalid negotiated features.\n",
dev->vid);
return -1;
}
if ((dev->flags & VIRTIO_DEV_RUNNING) && dev->negotiated_features != features) {
if (dev->notify_ops->features_changed) {
dev->notify_ops->features_changed(dev->vid, features);
} else {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
}
dev->negotiated_features = features;
if (dev->negotiated_features &
((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
} else {
dev->vhost_hlen = sizeof(struct virtio_net_hdr);
}
VHOST_LOG_DEBUG(VHOST_CONFIG,
"(%d) mergeable RX buffers %s, virtio 1 %s\n",
dev->vid,
(dev->negotiated_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
(dev->negotiated_features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
return 0;
}
/*
* The virtio device sends us the size of the descriptor ring.
*/
static int
vhost_user_set_vring_num(struct virtio_net *dev,
VhostUserMsg *msg)
{
struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
vq->size = msg->payload.state.num;
if (dev->dequeue_zero_copy) {
vq->nr_zmbuf = 0;
vq->last_zmbuf_idx = 0;
vq->zmbuf_size = vq->size;
vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
sizeof(struct zcopy_mbuf), 0);
if (vq->zmbufs == NULL) {
RTE_LOG(WARNING, VHOST_CONFIG,
"failed to allocate mem for zero copy; "
"zero copy is force disabled\n");
dev->dequeue_zero_copy = 0;
}
}
vq->shadow_used_ring = rte_malloc(NULL,
vq->size * sizeof(struct vring_used_elem),
RTE_CACHE_LINE_SIZE);
if (!vq->shadow_used_ring) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to allocate memory for shadow used ring.\n");
return -1;
}
return 0;
}
/*
* Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
* same numa node as the memory of vring descriptor.
*/
#ifdef RTE_LIBRTE_VHOST_NUMA
static struct virtio_net*
numa_realloc(struct virtio_net *dev, int index)
{
int oldnode, newnode;
struct virtio_net *old_dev;
struct vhost_virtqueue *old_vq, *vq;
int ret;
old_dev = dev;
vq = old_vq = dev->virtqueue[index];
ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
MPOL_F_NODE | MPOL_F_ADDR);
/* check if we need to reallocate vq */
ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
MPOL_F_NODE | MPOL_F_ADDR);
if (ret) {
RTE_LOG(ERR, VHOST_CONFIG,
"Unable to get vq numa information.\n");
return dev;
}
if (oldnode != newnode) {
RTE_LOG(INFO, VHOST_CONFIG,
"reallocate vq from %d to %d node\n", oldnode, newnode);
vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
if (!vq)
return dev;
memcpy(vq, old_vq, sizeof(*vq));
rte_free(old_vq);
}
/* check if we need to reallocate dev */
ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
MPOL_F_NODE | MPOL_F_ADDR);
if (ret) {
RTE_LOG(ERR, VHOST_CONFIG,
"Unable to get dev numa information.\n");
goto out;
}
if (oldnode != newnode) {
RTE_LOG(INFO, VHOST_CONFIG,
"reallocate dev from %d to %d node\n",
oldnode, newnode);
dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
if (!dev) {
dev = old_dev;
goto out;
}
memcpy(dev, old_dev, sizeof(*dev));
rte_free(old_dev);
}
out:
dev->virtqueue[index] = vq;
vhost_devices[dev->vid] = dev;
return dev;
}
#else
static struct virtio_net*
numa_realloc(struct virtio_net *dev, int index __rte_unused)
{
return dev;
}
#endif
/*
* Converts QEMU virtual address to Vhost virtual address. This function is
* used to convert the ring addresses to our address space.
*/
static uint64_t
qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
{
struct rte_vhost_mem_region *reg;
uint32_t i;
/* Find the region where the address lives. */
for (i = 0; i < dev->mem->nregions; i++) {
reg = &dev->mem->regions[i];
if (qva >= reg->guest_user_addr &&
qva < reg->guest_user_addr + reg->size) {
if (unlikely(*len > reg->guest_user_addr + reg->size - qva))
*len = reg->guest_user_addr + reg->size - qva;
return qva - reg->guest_user_addr +
reg->host_user_addr;
}
}
return 0;
}
static int vhost_setup_mem_table(struct virtio_net *dev);
/*
* The virtio device sends us the desc, used and avail ring addresses.
* This function then converts these to our address space.
*/
static int
vhost_user_set_vring_addr(struct virtio_net *dev, VhostUserMsg *msg)
{
struct vhost_virtqueue *vq;
uint64_t len;
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
if (dev->has_new_mem_table) {
vhost_setup_mem_table(dev);
dev->has_new_mem_table = 0;
}
if (dev->mem == NULL)
return -1;
/* addr->index refers to the queue index. The txq 1, rxq is 0. */
vq = dev->virtqueue[msg->payload.addr.index];
/* The addresses are converted from QEMU virtual to Vhost virtual. */
len = sizeof(struct vring_desc) * vq->size;
vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
msg->payload.addr.desc_user_addr, &len);
if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to map desc ring.\n",
dev->vid);
return -1;
}
dev = numa_realloc(dev, msg->payload.addr.index);
vq = dev->virtqueue[msg->payload.addr.index];
len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
msg->payload.addr.avail_user_addr, &len);
if (vq->avail == 0 ||
len != sizeof(struct vring_avail)
+ sizeof(uint16_t) * vq->size) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to find avail ring address.\n",
dev->vid);
return -1;
}
len = sizeof(struct vring_used) +
sizeof(struct vring_used_elem) * vq->size;
vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
msg->payload.addr.used_user_addr, &len);
if (vq->used == 0 || len != sizeof(struct vring_used) +
sizeof(struct vring_used_elem) * vq->size) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to find used ring address.\n",
dev->vid);
return -1;
}
if (vq->last_used_idx != vq->used->idx) {
RTE_LOG(WARNING, VHOST_CONFIG,
"last_used_idx (%u) and vq->used->idx (%u) mismatches; "
"some packets maybe resent for Tx and dropped for Rx\n",
vq->last_used_idx, vq->used->idx);
vq->last_used_idx = vq->used->idx;
vq->last_avail_idx = vq->used->idx;
}
vq->log_guest_addr = msg->payload.addr.log_guest_addr;
VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
dev->vid, vq->desc);
VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
dev->vid, vq->avail);
VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
dev->vid, vq->used);
VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
dev->vid, vq->log_guest_addr);
return 0;
}
/*
* The virtio device sends us the available ring last used index.
*/
static int
vhost_user_set_vring_base(struct virtio_net *dev,
VhostUserMsg *msg)
{
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
dev->virtqueue[msg->payload.state.index]->last_used_idx = msg->payload.state.num;
dev->virtqueue[msg->payload.state.index]->last_avail_idx = msg->payload.state.num;
return 0;
}
static void
add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
uint64_t host_phys_addr, uint64_t size)
{
struct guest_page *page, *last_page;
if (dev->nr_guest_pages == dev->max_guest_pages) {
dev->max_guest_pages = RTE_MAX(8U, dev->max_guest_pages * 2);
dev->guest_pages = realloc(dev->guest_pages,
dev->max_guest_pages * sizeof(*page));
}
if (dev->nr_guest_pages > 0) {
last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
/* merge if the two pages are continuous */
if (host_phys_addr == last_page->host_phys_addr +
last_page->size) {
last_page->size += size;
return;
}
}
page = &dev->guest_pages[dev->nr_guest_pages++];
page->guest_phys_addr = guest_phys_addr;
page->host_phys_addr = host_phys_addr;
page->size = size;
}
static void
add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
uint64_t page_size)
{
uint64_t reg_size = reg->size;
uint64_t host_user_addr = reg->host_user_addr;
uint64_t guest_phys_addr = reg->guest_phys_addr;
uint64_t host_phys_addr;
uint64_t size;
host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)host_user_addr);
size = page_size - (guest_phys_addr & (page_size - 1));
size = RTE_MIN(size, reg_size);
add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
host_user_addr += size;
guest_phys_addr += size;
reg_size -= size;
while (reg_size > 0) {
size = RTE_MIN(reg_size, page_size);
host_phys_addr = rte_mem_virt2phy((void *)(uintptr_t)
host_user_addr);
add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size);
host_user_addr += size;
guest_phys_addr += size;
reg_size -= size;
}
}
#ifdef RTE_LIBRTE_VHOST_DEBUG
/* TODO: enable it only in debug mode? */
static void
dump_guest_pages(struct virtio_net *dev)
{
uint32_t i;
struct guest_page *page;
for (i = 0; i < dev->nr_guest_pages; i++) {
page = &dev->guest_pages[i];
RTE_LOG(INFO, VHOST_CONFIG,
"guest physical page region %u\n"
"\t guest_phys_addr: %" PRIx64 "\n"
"\t host_phys_addr : %" PRIx64 "\n"
"\t size : %" PRIx64 "\n",
i,
page->guest_phys_addr,
page->host_phys_addr,
page->size);
}
}
#else
#define dump_guest_pages(dev)
#endif
static int
vhost_user_set_mem_table(struct virtio_net *dev, struct VhostUserMsg *pmsg)
{
uint32_t i;
if (dev->has_new_mem_table) {
/*
* The previous mem table was not consumed, so close the
* file descriptors from that mem table before copying
* the new one.
*/
for (i = 0; i < dev->mem_table.nregions; i++) {
close(dev->mem_table_fds[i]);
}
}
memcpy(&dev->mem_table, &pmsg->payload.memory, sizeof(dev->mem_table));
memcpy(dev->mem_table_fds, pmsg->fds, sizeof(dev->mem_table_fds));
dev->has_new_mem_table = 1;
/* vhost-user-nvme will not send
* set vring addr message, enable
* memory address table now.
*/
if (dev->has_new_mem_table && dev->is_nvme) {
vhost_setup_mem_table(dev);
dev->has_new_mem_table = 0;
}
return 0;
}
static int
vhost_setup_mem_table(struct virtio_net *dev)
{
struct VhostUserMemory memory = dev->mem_table;
struct rte_vhost_mem_region *reg;
struct vhost_virtqueue *vq;
void *mmap_addr;
uint64_t mmap_size;
uint64_t mmap_offset;
uint64_t alignment;
uint32_t i;
int fd;
if (dev->mem) {
free_mem_region(dev);
rte_free(dev->mem);
dev->mem = NULL;
}
for (i = 0; i < dev->nr_vring; i++) {
vq = dev->virtqueue[i];
/* Those addresses won't be valid anymore in host address space
* after setting new mem table. Initiator need to resend these
* addresses.
*/
vq->desc = NULL;
vq->avail = NULL;
vq->used = NULL;
}
dev->nr_guest_pages = 0;
if (!dev->guest_pages) {
dev->max_guest_pages = 8;
dev->guest_pages = malloc(dev->max_guest_pages *
sizeof(struct guest_page));
}
dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
sizeof(struct rte_vhost_mem_region) * memory.nregions, 0);
if (dev->mem == NULL) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to allocate memory for dev->mem\n",
dev->vid);
return -1;
}
dev->mem->nregions = memory.nregions;
for (i = 0; i < memory.nregions; i++) {
fd = dev->mem_table_fds[i];
reg = &dev->mem->regions[i];
reg->guest_phys_addr = memory.regions[i].guest_phys_addr;
reg->guest_user_addr = memory.regions[i].userspace_addr;
reg->size = memory.regions[i].memory_size;
reg->fd = fd;
mmap_offset = memory.regions[i].mmap_offset;
mmap_size = reg->size + mmap_offset;
/* mmap() without flag of MAP_ANONYMOUS, should be called
* with length argument aligned with hugepagesz at older
* longterm version Linux, like 2.6.32 and 3.2.72, or
* mmap() will fail with EINVAL.
*
* to avoid failure, make sure in caller to keep length
* aligned.
*/
alignment = get_blk_size(fd);
if (alignment == (uint64_t)-1) {
RTE_LOG(ERR, VHOST_CONFIG,
"couldn't get hugepage size through fstat\n");
goto err_mmap;
}
mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, 0);
if (mmap_addr == MAP_FAILED) {
RTE_LOG(ERR, VHOST_CONFIG,
"mmap region %u failed.\n", i);
goto err_mmap;
}
if (madvise(mmap_addr, mmap_size, MADV_DONTDUMP) != 0) {
RTE_LOG(INFO, VHOST_CONFIG,
"MADV_DONTDUMP advice setting failed.\n");
}
reg->mmap_addr = mmap_addr;
reg->mmap_size = mmap_size;
reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
mmap_offset;
if (dev->dequeue_zero_copy)
add_guest_pages(dev, reg, alignment);
RTE_LOG(INFO, VHOST_CONFIG,
"guest memory region %u, size: 0x%" PRIx64 "\n"
"\t guest physical addr: 0x%" PRIx64 "\n"
"\t guest virtual addr: 0x%" PRIx64 "\n"
"\t host virtual addr: 0x%" PRIx64 "\n"
"\t mmap addr : 0x%" PRIx64 "\n"
"\t mmap size : 0x%" PRIx64 "\n"
"\t mmap align: 0x%" PRIx64 "\n"
"\t mmap off : 0x%" PRIx64 "\n",
i, reg->size,
reg->guest_phys_addr,
reg->guest_user_addr,
reg->host_user_addr,
(uint64_t)(uintptr_t)mmap_addr,
mmap_size,
alignment,
mmap_offset);
}
dump_guest_pages(dev);
return 0;
err_mmap:
free_mem_region(dev);
rte_free(dev->mem);
dev->mem = NULL;
return -1;
}
static int
vq_is_ready(struct vhost_virtqueue *vq)
{
return vq && vq->desc &&
vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
vq->kickfd != VIRTIO_INVALID_EVENTFD &&
vq->callfd != VIRTIO_INVALID_EVENTFD;
}
static int
virtio_is_ready(struct virtio_net *dev)
{
struct vhost_virtqueue *vq;
uint32_t i;
if (dev->nr_vring == 0)
return 0;
for (i = 0; i < dev->nr_vring; i++) {
vq = dev->virtqueue[i];
if (vq_is_ready(vq)) {
RTE_LOG(INFO, VHOST_CONFIG,
"virtio is now ready for processing.\n");
return 1;
}
}
return 0;
}
static void
vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
{
struct vhost_vring_file file;
struct vhost_virtqueue *vq;
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
file.fd = VIRTIO_INVALID_EVENTFD;
else
file.fd = pmsg->fds[0];
RTE_LOG(INFO, VHOST_CONFIG,
"vring call idx:%d file:%d\n", file.index, file.fd);
vq = dev->virtqueue[file.index];
if (vq->callfd >= 0)
close(vq->callfd);
vq->callfd = file.fd;
}
static void
vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
{
struct vhost_vring_file file;
struct vhost_virtqueue *vq;
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
file.fd = VIRTIO_INVALID_EVENTFD;
else
file.fd = pmsg->fds[0];
RTE_LOG(INFO, VHOST_CONFIG,
"vring kick idx:%d file:%d\n", file.index, file.fd);
vq = dev->virtqueue[file.index];
if (vq->kickfd >= 0)
close(vq->kickfd);
vq->kickfd = file.fd;
}
static void
free_zmbufs(struct vhost_virtqueue *vq)
{
struct zcopy_mbuf *zmbuf, *next;
for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
zmbuf != NULL; zmbuf = next) {
next = TAILQ_NEXT(zmbuf, next);
rte_pktmbuf_free(zmbuf->mbuf);
TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
}
rte_free(vq->zmbufs);
}
/*
* when virtio is stopped, qemu will send us the GET_VRING_BASE message.
*/
static int
vhost_user_get_vring_base(struct virtio_net *dev,
VhostUserMsg *msg)
{
struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
/* We have to stop the queue (virtio) if it is running. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
dev->flags &= ~VIRTIO_DEV_READY;
/* Here we are safe to get the last used index */
msg->payload.state.num = vq->last_used_idx;
RTE_LOG(INFO, VHOST_CONFIG,
"vring base idx:%d file:%d\n", msg->payload.state.index, msg->payload.state.num);
/*
* Based on current qemu vhost-user implementation, this message is
* sent and only sent in vhost_vring_stop.
* TODO: cleanup the vring, it isn't usable since here.
*/
if (vq->kickfd >= 0)
close(vq->kickfd);
vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
if (vq->callfd >= 0)
close(vq->callfd);
vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
if (dev->dequeue_zero_copy)
free_zmbufs(vq);
rte_free(vq->shadow_used_ring);
vq->shadow_used_ring = NULL;
return 0;
}
/*
* when virtio queues are ready to work, qemu will send us to
* enable the virtio queue pair.
*/
static int
vhost_user_set_vring_enable(struct virtio_net *dev,
VhostUserMsg *msg)
{
int enable = (int)msg->payload.state.num;
RTE_LOG(INFO, VHOST_CONFIG,
"set queue enable: %d to qp idx: %d\n",
enable, msg->payload.state.index);
if (dev->notify_ops->vring_state_changed)
dev->notify_ops->vring_state_changed(dev->vid, msg->payload.state.index, enable);
dev->virtqueue[msg->payload.state.index]->enabled = enable;
return 0;
}
static void
vhost_user_set_protocol_features(struct virtio_net *dev,
uint64_t protocol_features)
{
if (protocol_features & ~VHOST_USER_PROTOCOL_FEATURES)
return;
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
dev->protocol_features = protocol_features;
}
static int
vhost_user_set_log_base(struct virtio_net *dev, struct VhostUserMsg *msg)
{
int fd = msg->fds[0];
uint64_t size, off;
void *addr;
if (fd < 0) {
RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
return -1;
}
if (msg->size != sizeof(VhostUserLog)) {
RTE_LOG(ERR, VHOST_CONFIG,
"invalid log base msg size: %"PRId32" != %d\n",
msg->size, (int)sizeof(VhostUserLog));
return -1;
}
/* Remove from the data plane. */
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
size = msg->payload.log.mmap_size;
off = msg->payload.log.mmap_offset;
RTE_LOG(INFO, VHOST_CONFIG,
"log mmap size: %"PRId64", offset: %"PRId64"\n",
size, off);
/*
* mmap from 0 to workaround a hugepage mmap bug: mmap will
* fail when offset is not page size aligned.
*/
addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
close(fd);
if (addr == MAP_FAILED) {
RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
return -1;
}
/*
* Free previously mapped log memory on occasionally
* multiple VHOST_USER_SET_LOG_BASE.
*/
if (dev->log_addr) {
munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
}
dev->log_addr = (uint64_t)(uintptr_t)addr;
dev->log_base = dev->log_addr + off;
dev->log_size = size;
return 0;
}
/*
* An rarp packet is constructed and broadcasted to notify switches about
* the new location of the migrated VM, so that packets from outside will
* not be lost after migration.
*
* However, we don't actually "send" a rarp packet here, instead, we set
* a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
*/
static int
vhost_user_send_rarp(struct virtio_net *dev, struct VhostUserMsg *msg)
{
uint8_t *mac = (uint8_t *)&msg->payload.u64;
RTE_LOG(DEBUG, VHOST_CONFIG,
":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
memcpy(dev->mac.addr_bytes, mac, 6);
/*
* Set the flag to inject a RARP broadcast packet at
* rte_vhost_dequeue_burst().
*
* rte_smp_wmb() is for making sure the mac is copied
* before the flag is set.
*/
rte_smp_wmb();
rte_atomic16_set(&dev->broadcast_rarp, 1);
return 0;
}
static int
vhost_user_net_set_mtu(struct virtio_net *dev, struct VhostUserMsg *msg)
{
if (msg->payload.u64 < VIRTIO_MIN_MTU ||
msg->payload.u64 > VIRTIO_MAX_MTU) {
RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
msg->payload.u64);
return -1;
}
dev->mtu = msg->payload.u64;
return 0;
}
/* return bytes# of read on success or negative val on failure. */
static int
read_vhost_message(int sockfd, struct VhostUserMsg *msg)
{
int ret;
ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
msg->fds, VHOST_MEMORY_MAX_NREGIONS);
if (ret <= 0)
return ret;
if (msg && msg->size) {
if (msg->size > sizeof(msg->payload)) {
RTE_LOG(ERR, VHOST_CONFIG,
"invalid msg size: %d\n", msg->size);
return -1;
}
ret = read(sockfd, &msg->payload, msg->size);
if (ret <= 0)
return ret;
if (ret != (int)msg->size) {
RTE_LOG(ERR, VHOST_CONFIG,
"read control message failed\n");
return -1;
}
}
return ret;
}
static int
send_vhost_message(int sockfd, struct VhostUserMsg *msg)
{
int ret;
if (!msg)
return 0;
msg->flags &= ~VHOST_USER_VERSION_MASK;
msg->flags &= ~VHOST_USER_NEED_REPLY;
msg->flags |= VHOST_USER_VERSION;
msg->flags |= VHOST_USER_REPLY_MASK;
ret = send_fd_message(sockfd, (char *)msg,
VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
return ret;
}
/*
* Allocate a queue pair if it hasn't been allocated yet
*/
static int
vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg)
{
uint16_t vring_idx;
switch (msg->request) {
case VHOST_USER_SET_VRING_KICK:
case VHOST_USER_SET_VRING_CALL:
case VHOST_USER_SET_VRING_ERR:
vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
break;
case VHOST_USER_SET_VRING_NUM:
case VHOST_USER_SET_VRING_BASE:
case VHOST_USER_SET_VRING_ENABLE:
vring_idx = msg->payload.state.index;
break;
case VHOST_USER_SET_VRING_ADDR:
vring_idx = msg->payload.addr.index;
break;
default:
return 0;
}
if (vring_idx >= VHOST_MAX_VRING) {
RTE_LOG(ERR, VHOST_CONFIG,
"invalid vring index: %u\n", vring_idx);
return -1;
}
if (dev->virtqueue[vring_idx])
return 0;
return alloc_vring_queue(dev, vring_idx);
}
static int
vhost_user_nvme_admin_passthrough(struct virtio_net *dev,
void *cmd, void *cqe, void *buf)
{
if (dev->notify_ops->vhost_nvme_admin_passthrough) {
return dev->notify_ops->vhost_nvme_admin_passthrough(dev->vid, cmd, cqe, buf);
}
return -1;
}
static int
vhost_user_nvme_set_cq_call(struct virtio_net *dev, uint16_t qid, int fd)
{
if (dev->notify_ops->vhost_nvme_set_cq_call) {
return dev->notify_ops->vhost_nvme_set_cq_call(dev->vid, qid, fd);
}
return -1;
}
static int
vhost_user_nvme_get_cap(struct virtio_net *dev, uint64_t *cap)
{
if (dev->notify_ops->vhost_nvme_get_cap) {
return dev->notify_ops->vhost_nvme_get_cap(dev->vid, cap);
}
return -1;
}
static int
vhost_user_nvme_set_bar_mr(struct virtio_net *dev, struct VhostUserMsg *pmsg)
{
struct VhostUserMemory mem_table;
int fd = pmsg->fds[0];
void *mmap_addr;
uint64_t mmap_size;
uint64_t mmap_offset;
uint64_t alignment;
struct rte_vhost_mem_region reg;
int ret = 0;
memcpy(&mem_table, &pmsg->payload.memory, sizeof(mem_table));
reg.guest_phys_addr = mem_table.regions[0].guest_phys_addr;
reg.guest_user_addr = mem_table.regions[0].userspace_addr;
reg.size = mem_table.regions[0].memory_size;
reg.fd = fd;
mmap_offset = mem_table.regions[0].mmap_offset;
mmap_size = reg.size + mmap_offset;
alignment = get_blk_size(fd);
if (alignment == (uint64_t)-1) {
RTE_LOG(ERR, VHOST_CONFIG,
"couldn't get hugepage size through fstat\n");
return -1;
}
mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, fd, 0);
if (mmap_addr == MAP_FAILED) {
RTE_LOG(ERR, VHOST_CONFIG,
"mmap region failed.\n");
return -1;
}
if (madvise(mmap_addr, mmap_size, MADV_DONTDUMP) != 0) {
RTE_LOG(INFO, VHOST_CONFIG,
"MADV_DONTDUMP advice setting failed.\n");
}
reg.mmap_addr = mmap_addr;
reg.mmap_size = mmap_size;
reg.host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
mmap_offset;
RTE_LOG(INFO, VHOST_CONFIG,
"BAR memory region %u, size: 0x%" PRIx64 "\n"
"\t guest physical addr: 0x%" PRIx64 "\n"
"\t guest virtual addr: 0x%" PRIx64 "\n"
"\t host virtual addr: 0x%" PRIx64 "\n"
"\t mmap addr : 0x%" PRIx64 "\n"
"\t mmap size : 0x%" PRIx64 "\n"
"\t mmap align: 0x%" PRIx64 "\n"
"\t mmap off : 0x%" PRIx64 "\n",
0, reg.size,
reg.guest_phys_addr,
reg.guest_user_addr,
reg.host_user_addr,
(uint64_t)(uintptr_t)mmap_addr,
mmap_size,
alignment,
mmap_offset);
if (dev->bar_addr) {
munmap((void *)(uintptr_t)dev->bar_addr, dev->bar_size);
}
dev->bar_addr = (void *)(uintptr_t)reg.host_user_addr;
dev->bar_size = reg.mmap_size;
if (dev->notify_ops->vhost_nvme_set_bar_mr) {
ret = dev->notify_ops->vhost_nvme_set_bar_mr(dev->vid, dev->bar_addr, dev->bar_size);
if (ret) {
munmap((void *)(uintptr_t)dev->bar_addr, dev->bar_size);
dev->bar_addr = NULL;
dev->bar_size = 0;
}
}
return ret;
}
int
vhost_user_msg_handler(int vid, int fd)
{
struct virtio_net *dev;
struct VhostUserMsg msg;
struct vhost_vring_file file;
int ret;
uint64_t cap;
uint64_t enable;
uint8_t cqe[16];
uint8_t cmd[64];
uint8_t buf[4096];
dev = get_device(vid);
if (dev == NULL)
return -1;
ret = read_vhost_message(fd, &msg);
if (ret <= 0 || msg.request >= VHOST_USER_MAX) {
if (ret < 0)
RTE_LOG(ERR, VHOST_CONFIG,
"vhost read message failed\n");
else if (ret == 0)
RTE_LOG(INFO, VHOST_CONFIG,
"vhost peer closed\n");
else
RTE_LOG(ERR, VHOST_CONFIG,
"vhost read incorrect message\n");
return -1;
}
RTE_LOG(INFO, VHOST_CONFIG, "%s: read message %s\n",
dev->ifname, vhost_message_str[msg.request]);
ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to alloc queue\n");
return -1;
}
switch (msg.request) {
case VHOST_USER_GET_CONFIG:
if (dev->notify_ops->get_config(dev->vid,
msg.payload.config.region,
msg.payload.config.size) != 0) {
msg.size = sizeof(uint64_t);
}
send_vhost_message(fd, &msg);
break;
case VHOST_USER_SET_CONFIG:
if ((dev->notify_ops->set_config(dev->vid,
msg.payload.config.region,
msg.payload.config.offset,
msg.payload.config.size,
msg.payload.config.flags)) != 0) {
ret = 1;
} else {
ret = 0;
}
break;
case VHOST_USER_NVME_ADMIN:
if (!dev->is_nvme) {
dev->is_nvme = 1;
}
memcpy(cmd, msg.payload.nvme.cmd.req, sizeof(cmd));
ret = vhost_user_nvme_admin_passthrough(dev, cmd, cqe, buf);
memcpy(msg.payload.nvme.cmd.cqe, cqe, sizeof(cqe));
msg.size = sizeof(cqe);
/* NVMe Identify Command */
if (cmd[0] == 0x06) {
memcpy(msg.payload.nvme.buf, &buf, 4096);
msg.size += 4096;
}
send_vhost_message(fd, &msg);
break;
case VHOST_USER_NVME_SET_CQ_CALL:
file.index = msg.payload.u64 & VHOST_USER_VRING_IDX_MASK;
file.fd = msg.fds[0];
ret = vhost_user_nvme_set_cq_call(dev, file.index, file.fd);
break;
case VHOST_USER_NVME_GET_CAP:
ret = vhost_user_nvme_get_cap(dev, &cap);
if (!ret)
msg.payload.u64 = cap;
else
msg.payload.u64 = 0;
msg.size = sizeof(msg.payload.u64);
send_vhost_message(fd, &msg);
break;
case VHOST_USER_NVME_START_STOP:
enable = msg.payload.u64;
/* device must be started before set cq call */
if (enable) {
if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
if (dev->notify_ops->new_device(dev->vid) == 0)
dev->flags |= VIRTIO_DEV_RUNNING;
}
} else {
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
}
break;
case VHOST_USER_NVME_SET_BAR_MR:
ret = vhost_user_nvme_set_bar_mr(dev, &msg);
break;
case VHOST_USER_GET_FEATURES:
msg.payload.u64 = vhost_user_get_features(dev);
msg.size = sizeof(msg.payload.u64);
send_vhost_message(fd, &msg);
break;
case VHOST_USER_SET_FEATURES:
vhost_user_set_features(dev, msg.payload.u64);
break;
case VHOST_USER_GET_PROTOCOL_FEATURES:
msg.payload.u64 = VHOST_USER_PROTOCOL_FEATURES;
msg.size = sizeof(msg.payload.u64);
send_vhost_message(fd, &msg);
break;
case VHOST_USER_SET_PROTOCOL_FEATURES:
vhost_user_set_protocol_features(dev, msg.payload.u64);
break;
case VHOST_USER_SET_OWNER:
vhost_user_set_owner();
break;
case VHOST_USER_RESET_OWNER:
vhost_user_reset_owner(dev);
break;
case VHOST_USER_SET_MEM_TABLE:
ret = vhost_user_set_mem_table(dev, &msg);
break;
case VHOST_USER_SET_LOG_BASE:
vhost_user_set_log_base(dev, &msg);
/* it needs a reply */
msg.size = sizeof(msg.payload.u64);
send_vhost_message(fd, &msg);
break;
case VHOST_USER_SET_LOG_FD:
close(msg.fds[0]);
RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
break;
case VHOST_USER_SET_VRING_NUM:
vhost_user_set_vring_num(dev, &msg);
break;
case VHOST_USER_SET_VRING_ADDR:
vhost_user_set_vring_addr(dev, &msg);
break;
case VHOST_USER_SET_VRING_BASE:
vhost_user_set_vring_base(dev, &msg);
break;
case VHOST_USER_GET_VRING_BASE:
vhost_user_get_vring_base(dev, &msg);
msg.size = sizeof(msg.payload.state);
send_vhost_message(fd, &msg);
break;
case VHOST_USER_SET_VRING_KICK:
vhost_user_set_vring_kick(dev, &msg);
break;
case VHOST_USER_SET_VRING_CALL:
vhost_user_set_vring_call(dev, &msg);
break;
case VHOST_USER_SET_VRING_ERR:
if (!(msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK))
close(msg.fds[0]);
RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
break;
case VHOST_USER_GET_QUEUE_NUM:
msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
msg.size = sizeof(msg.payload.u64);
send_vhost_message(fd, &msg);
break;
case VHOST_USER_SET_VRING_ENABLE:
vhost_user_set_vring_enable(dev, &msg);
break;
case VHOST_USER_SEND_RARP:
vhost_user_send_rarp(dev, &msg);
break;
case VHOST_USER_NET_SET_MTU:
ret = vhost_user_net_set_mtu(dev, &msg);
break;
default:
ret = -1;
break;
}
if (msg.flags & VHOST_USER_NEED_REPLY) {
msg.payload.u64 = !!ret;
msg.size = sizeof(msg.payload.u64);
send_vhost_message(fd, &msg);
}
if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
dev->flags |= VIRTIO_DEV_READY;
if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
if (dev->dequeue_zero_copy) {
RTE_LOG(INFO, VHOST_CONFIG,
"dequeue zero copy is enabled\n");
}
if (dev->notify_ops->new_device(dev->vid) == 0)
dev->flags |= VIRTIO_DEV_RUNNING;
}
}
return 0;
}