[dpdk-dev] [PATCH 16/21] vhost: postpone rings addresses translation
Maxime Coquelin
maxime.coquelin at redhat.com
Thu Aug 31 11:50:18 CEST 2017
This patch postpones rings addresses translations and checks, as
addresses sent by the master shuld not be interpreted as long as
ring is not started and enabled[0].
When protocol features aren't negotiated, the ring is started in
enabled state, so the addresses translations are postponed to
vhost_user_set_vring_kick().
Otherwise, it is postponed to when ring is enabled, in
vhost_user_set_vring_enable().
[0]: http://lists.nongnu.org/archive/html/qemu-devel/2017-05/msg04355.html
Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
lib/librte_vhost/vhost.h | 1 +
lib/librte_vhost/vhost_user.c | 74 +++++++++++++++++++++++++++++++++----------
2 files changed, 58 insertions(+), 17 deletions(-)
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 2653ec123..c90e73268 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -115,6 +115,7 @@ struct vhost_virtqueue {
struct vring_used_elem *shadow_used_ring;
uint16_t shadow_used_idx;
+ struct vhost_vring_addr ring_addrs;
rte_rwlock_t iotlb_lock;
struct rte_mempool *iotlb_pool;
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index a0c7c2f86..a2e030308 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -313,10 +313,10 @@ qva_to_vva(struct virtio_net *dev, uint64_t qva)
* This function then converts these to our address space.
*/
static int
-vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
+vhost_user_set_vring_addr(struct virtio_net *dev, VhostUserMsg *msg)
{
struct vhost_virtqueue *vq;
- struct virtio_net *dev = *pdev;
+ struct vhost_vring_addr *addr = &msg->payload.addr;
if (dev->mem == NULL)
return -1;
@@ -324,35 +324,50 @@ vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
/* addr->index refers to the queue index. The txq 1, rxq is 0. */
vq = dev->virtqueue[msg->payload.addr.index];
+ /*
+ * Rings addresses should not be interpreted as long as the ring is not
+ * started and enabled
+ */
+ memcpy(&vq->ring_addrs, addr, sizeof(*addr));
+
+ return 0;
+}
+
+static struct virtio_net *translate_ring_addresses(struct virtio_net *dev,
+ int vq_index)
+{
+ struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
+ struct vhost_vring_addr *addr = &vq->ring_addrs;
+
/* The addresses are converted from QEMU virtual to Vhost virtual. */
vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
- msg->payload.addr.desc_user_addr);
+ addr->desc_user_addr);
if (vq->desc == 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to find desc ring address.\n",
dev->vid);
- return -1;
+ return NULL;
}
- *pdev = dev = numa_realloc(dev, msg->payload.addr.index);
- vq = dev->virtqueue[msg->payload.addr.index];
+ dev = numa_realloc(dev, vq_index);
+ vq = dev->virtqueue[vq_index];
vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
- msg->payload.addr.avail_user_addr);
+ addr->avail_user_addr);
if (vq->avail == 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to find avail ring address.\n",
dev->vid);
- return -1;
+ return NULL;
}
vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
- msg->payload.addr.used_user_addr);
+ addr->used_user_addr);
if (vq->used == 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"(%d) failed to find used ring address.\n",
dev->vid);
- return -1;
+ return NULL;
}
if (vq->last_used_idx != vq->used->idx) {
@@ -364,7 +379,7 @@ vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
vq->last_avail_idx = vq->used->idx;
}
- vq->log_guest_addr = msg->payload.addr.log_guest_addr;
+ vq->log_guest_addr = addr->log_guest_addr;
LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
dev->vid, vq->desc);
@@ -375,7 +390,7 @@ vhost_user_set_vring_addr(struct virtio_net **pdev, VhostUserMsg *msg)
LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
dev->vid, vq->log_guest_addr);
- return 0;
+ return dev;
}
/*
@@ -646,10 +661,11 @@ vhost_user_set_vring_call(struct virtio_net *dev, struct VhostUserMsg *pmsg)
}
static void
-vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
+vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *pmsg)
{
struct vhost_vring_file file;
struct vhost_virtqueue *vq;
+ struct virtio_net *dev = *pdev;
file.index = pmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
if (pmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
@@ -659,6 +675,16 @@ vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
RTE_LOG(INFO, VHOST_CONFIG,
"vring kick idx:%d file:%d\n", file.index, file.fd);
+ /*
+ * Interpret ring addresses only when ring is started and enabled.
+ * This is now if protocol features aren't supported.
+ */
+ if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
+ *pdev = dev = translate_ring_addresses(dev, file.index);
+ if (!dev)
+ return;
+ }
+
vq = dev->virtqueue[file.index];
/*
@@ -736,15 +762,29 @@ vhost_user_get_vring_base(struct virtio_net *dev,
* enable the virtio queue pair.
*/
static int
-vhost_user_set_vring_enable(struct virtio_net *dev,
+vhost_user_set_vring_enable(struct virtio_net **pdev,
VhostUserMsg *msg)
{
+ struct virtio_net *dev = *pdev;
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);
+ /*
+ * Interpret ring addresses only when ring is started and enabled.
+ * This is now if protocol features are supported.
+ */
+ if (enable && (dev->features &
+ (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
+ dev = translate_ring_addresses(dev, msg->payload.state.index);
+ if (!dev)
+ return -1;
+
+ *pdev = dev;
+ }
+
if (dev->notify_ops->vring_state_changed)
dev->notify_ops->vring_state_changed(dev->vid,
msg->payload.state.index, enable);
@@ -1102,7 +1142,7 @@ vhost_user_msg_handler(int vid, int fd)
vhost_user_set_vring_num(dev, &msg);
break;
case VHOST_USER_SET_VRING_ADDR:
- vhost_user_set_vring_addr(&dev, &msg);
+ vhost_user_set_vring_addr(dev, &msg);
break;
case VHOST_USER_SET_VRING_BASE:
vhost_user_set_vring_base(dev, &msg);
@@ -1115,7 +1155,7 @@ vhost_user_msg_handler(int vid, int fd)
break;
case VHOST_USER_SET_VRING_KICK:
- vhost_user_set_vring_kick(dev, &msg);
+ vhost_user_set_vring_kick(&dev, &msg);
break;
case VHOST_USER_SET_VRING_CALL:
vhost_user_set_vring_call(dev, &msg);
@@ -1134,7 +1174,7 @@ vhost_user_msg_handler(int vid, int fd)
break;
case VHOST_USER_SET_VRING_ENABLE:
- vhost_user_set_vring_enable(dev, &msg);
+ vhost_user_set_vring_enable(&dev, &msg);
break;
case VHOST_USER_SEND_RARP:
vhost_user_send_rarp(dev, &msg);
--
2.13.3
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