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numam-dpdk/lib/librte_vhost/vhost.c
Junjie Chen e37ff95440 vhost: support virtqueue interrupt/notification suppression 
The driver can suppress interrupt when VIRTIO_F_EVENT_IDX feature bit is
negotiated. The driver set vring flags to 0, and MAY use used_event in
available ring to advise device interrupt util reach an index specified
by used_event. The device ignore the lower bit of vring flags, and send
an interrupt when index reach used_event.

The device can suppress notification in a manner analogous to the ways
driver suppress interrupt. The device manipulates flags or avail_event in
the used ring in the same way the driver manipulates flags or used_event in
available ring.

Signed-off-by: Junjie Chen <junjie.j.chen@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Tested-by: Lei Yao <lei.a.yao@intel.com>
Acked-by: Yuanhan Liu <yliu@fridaylinux.org>
2018-01-16 18:47:49 +01:00

607 lines
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2016 Intel Corporation
*/
#include <linux/vhost.h>
#include <linux/virtio_net.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numaif.h>
#endif
#include <rte_errno.h>
#include <rte_ethdev.h>
#include <rte_log.h>
#include <rte_string_fns.h>
#include <rte_memory.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include <rte_rwlock.h>
#include "iotlb.h"
#include "vhost.h"
#include "vhost_user.h"
struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
/* Called with iotlb_lock read-locked */
uint64_t
__vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t iova, uint64_t size, uint8_t perm)
{
uint64_t vva, tmp_size;
if (unlikely(!size))
return 0;
tmp_size = size;
vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
if (tmp_size == size)
return vva;
if (!vhost_user_iotlb_pending_miss(vq, iova + tmp_size, perm)) {
/*
* iotlb_lock is read-locked for a full burst,
* but it only protects the iotlb cache.
* In case of IOTLB miss, we might block on the socket,
* which could cause a deadlock with QEMU if an IOTLB update
* is being handled. We can safely unlock here to avoid it.
*/
vhost_user_iotlb_rd_unlock(vq);
vhost_user_iotlb_pending_insert(vq, iova + tmp_size, perm);
vhost_user_iotlb_miss(dev, iova + tmp_size, perm);
vhost_user_iotlb_rd_lock(vq);
}
return 0;
}
struct virtio_net *
get_device(int vid)
{
struct virtio_net *dev = vhost_devices[vid];
if (unlikely(!dev)) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) device not found.\n", vid);
}
return dev;
}
void
cleanup_vq(struct vhost_virtqueue *vq, int destroy)
{
if ((vq->callfd >= 0) && (destroy != 0))
close(vq->callfd);
if (vq->kickfd >= 0)
close(vq->kickfd);
}
/*
* Unmap any memory, close any file descriptors and
* free any memory owned by a device.
*/
void
cleanup_device(struct virtio_net *dev, int destroy)
{
uint32_t i;
vhost_backend_cleanup(dev);
for (i = 0; i < dev->nr_vring; i++)
cleanup_vq(dev->virtqueue[i], destroy);
}
void
free_vq(struct vhost_virtqueue *vq)
{
rte_free(vq->shadow_used_ring);
rte_free(vq->batch_copy_elems);
rte_mempool_free(vq->iotlb_pool);
rte_free(vq);
}
/*
* Release virtqueues and device memory.
*/
static void
free_device(struct virtio_net *dev)
{
uint32_t i;
for (i = 0; i < dev->nr_vring; i++)
free_vq(dev->virtqueue[i]);
rte_free(dev);
}
int
vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
uint64_t size;
if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
goto out;
size = sizeof(struct vring_desc) * vq->size;
vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
vq->ring_addrs.desc_user_addr,
size, VHOST_ACCESS_RW);
if (!vq->desc)
return -1;
size = sizeof(struct vring_avail);
size += sizeof(uint16_t) * vq->size;
vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
vq->ring_addrs.avail_user_addr,
size, VHOST_ACCESS_RW);
if (!vq->avail)
return -1;
size = sizeof(struct vring_used);
size += sizeof(struct vring_used_elem) * vq->size;
vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
vq->ring_addrs.used_user_addr,
size, VHOST_ACCESS_RW);
if (!vq->used)
return -1;
out:
vq->access_ok = 1;
return 0;
}
void
vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
vhost_user_iotlb_wr_lock(vq);
vq->access_ok = 0;
vq->desc = NULL;
vq->avail = NULL;
vq->used = NULL;
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
vhost_user_iotlb_wr_unlock(vq);
}
static void
init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
struct vhost_virtqueue *vq;
if (vring_idx >= VHOST_MAX_VRING) {
RTE_LOG(ERR, VHOST_CONFIG,
"Failed not init vring, out of bound (%d)\n",
vring_idx);
return;
}
vq = dev->virtqueue[vring_idx];
memset(vq, 0, sizeof(struct vhost_virtqueue));
vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
vhost_user_iotlb_init(dev, vring_idx);
/* Backends are set to -1 indicating an inactive device. */
vq->backend = -1;
TAILQ_INIT(&vq->zmbuf_list);
}
static void
reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
struct vhost_virtqueue *vq;
int callfd;
if (vring_idx >= VHOST_MAX_VRING) {
RTE_LOG(ERR, VHOST_CONFIG,
"Failed not init vring, out of bound (%d)\n",
vring_idx);
return;
}
vq = dev->virtqueue[vring_idx];
callfd = vq->callfd;
init_vring_queue(dev, vring_idx);
vq->callfd = callfd;
}
int
alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
struct vhost_virtqueue *vq;
vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
if (vq == NULL) {
RTE_LOG(ERR, VHOST_CONFIG,
"Failed to allocate memory for vring:%u.\n", vring_idx);
return -1;
}
dev->virtqueue[vring_idx] = vq;
init_vring_queue(dev, vring_idx);
dev->nr_vring += 1;
return 0;
}
/*
* Reset some variables in device structure, while keeping few
* others untouched, such as vid, ifname, nr_vring: they
* should be same unless the device is removed.
*/
void
reset_device(struct virtio_net *dev)
{
uint32_t i;
dev->features = 0;
dev->protocol_features = 0;
dev->flags = 0;
for (i = 0; i < dev->nr_vring; i++)
reset_vring_queue(dev, i);
}
/*
* Invoked when there is a new vhost-user connection established (when
* there is a new virtio device being attached).
*/
int
vhost_new_device(void)
{
struct virtio_net *dev;
int i;
dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
if (dev == NULL) {
RTE_LOG(ERR, VHOST_CONFIG,
"Failed to allocate memory for new dev.\n");
return -1;
}
for (i = 0; i < MAX_VHOST_DEVICE; i++) {
if (vhost_devices[i] == NULL)
break;
}
if (i == MAX_VHOST_DEVICE) {
RTE_LOG(ERR, VHOST_CONFIG,
"Failed to find a free slot for new device.\n");
rte_free(dev);
return -1;
}
vhost_devices[i] = dev;
dev->vid = i;
dev->slave_req_fd = -1;
return i;
}
/*
* Invoked when there is the vhost-user connection is broken (when
* the virtio device is being detached).
*/
void
vhost_destroy_device(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
if (dev->flags & VIRTIO_DEV_RUNNING) {
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(vid);
}
cleanup_device(dev, 1);
free_device(dev);
vhost_devices[vid] = NULL;
}
void
vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
{
struct virtio_net *dev;
unsigned int len;
dev = get_device(vid);
if (dev == NULL)
return;
len = if_len > sizeof(dev->ifname) ?
sizeof(dev->ifname) : if_len;
strncpy(dev->ifname, if_name, len);
dev->ifname[sizeof(dev->ifname) - 1] = '\0';
}
void
vhost_enable_dequeue_zero_copy(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
dev->dequeue_zero_copy = 1;
}
int
rte_vhost_get_mtu(int vid, uint16_t *mtu)
{
struct virtio_net *dev = get_device(vid);
if (!dev)
return -ENODEV;
if (!(dev->flags & VIRTIO_DEV_READY))
return -EAGAIN;
if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
return -ENOTSUP;
*mtu = dev->mtu;
return 0;
}
int
rte_vhost_get_numa_node(int vid)
{
#ifdef RTE_LIBRTE_VHOST_NUMA
struct virtio_net *dev = get_device(vid);
int numa_node;
int ret;
if (dev == NULL)
return -1;
ret = get_mempolicy(&numa_node, NULL, 0, dev,
MPOL_F_NODE | MPOL_F_ADDR);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to query numa node: %s\n",
vid, rte_strerror(errno));
return -1;
}
return numa_node;
#else
RTE_SET_USED(vid);
return -1;
#endif
}
uint32_t
rte_vhost_get_queue_num(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return 0;
return dev->nr_vring / 2;
}
uint16_t
rte_vhost_get_vring_num(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return 0;
return dev->nr_vring;
}
int
rte_vhost_get_ifname(int vid, char *buf, size_t len)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return -1;
len = RTE_MIN(len, sizeof(dev->ifname));
strncpy(buf, dev->ifname, len);
buf[len - 1] = '\0';
return 0;
}
int
rte_vhost_get_negotiated_features(int vid, uint64_t *features)
{
struct virtio_net *dev;
dev = get_device(vid);
if (!dev)
return -1;
*features = dev->features;
return 0;
}
int
rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
{
struct virtio_net *dev;
struct rte_vhost_memory *m;
size_t size;
dev = get_device(vid);
if (!dev)
return -1;
size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
m = malloc(sizeof(struct rte_vhost_memory) + size);
if (!m)
return -1;
m->nregions = dev->mem->nregions;
memcpy(m->regions, dev->mem->regions, size);
*mem = m;
return 0;
}
int
rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
struct rte_vhost_vring *vring)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (!dev)
return -1;
if (vring_idx >= VHOST_MAX_VRING)
return -1;
vq = dev->virtqueue[vring_idx];
if (!vq)
return -1;
vring->desc = vq->desc;
vring->avail = vq->avail;
vring->used = vq->used;
vring->log_guest_addr = vq->log_guest_addr;
vring->callfd = vq->callfd;
vring->kickfd = vq->kickfd;
vring->size = vq->size;
return 0;
}
int
rte_vhost_vring_call(int vid, uint16_t vring_idx)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (!dev)
return -1;
if (vring_idx >= VHOST_MAX_VRING)
return -1;
vq = dev->virtqueue[vring_idx];
if (!vq)
return -1;
vhost_vring_call(dev, vq);
return 0;
}
uint16_t
rte_vhost_avail_entries(int vid, uint16_t queue_id)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (!dev)
return 0;
vq = dev->virtqueue[queue_id];
if (!vq->enabled)
return 0;
return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
}
int
rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return -1;
if (enable) {
RTE_LOG(ERR, VHOST_CONFIG,
"guest notification isn't supported.\n");
return -1;
}
dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
return 0;
}
void
rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
vhost_log_write(dev, addr, len);
}
void
rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
uint64_t offset, uint64_t len)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (dev == NULL)
return;
if (vring_idx >= VHOST_MAX_VRING)
return;
vq = dev->virtqueue[vring_idx];
if (!vq)
return;
vhost_log_used_vring(dev, vq, offset, len);
}
uint32_t
rte_vhost_rx_queue_count(int vid, uint16_t qid)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (dev == NULL)
return 0;
if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
dev->vid, __func__, qid);
return 0;
}
vq = dev->virtqueue[qid];
if (vq == NULL)
return 0;
if (unlikely(vq->enabled == 0 || vq->avail == NULL))
return 0;
return *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
}
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