This patch adds support to the new Virtio device status
Vhost-user protocol feature.
Getting such information in the backend helps to know
when the driver is done with the device configuration
and so makes the initialization phase more robust.
Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
lib/librte_vhost/rte_vhost.h | 4 ++++
lib/librte_vhost/vhost.h | 9 ++++++++
lib/librte_vhost/vhost_user.c | 40 +++++++++++++++++++++++++++++++++++
lib/librte_vhost/vhost_user.h | 6 ++++--
4 files changed, 57 insertions(+), 2 deletions(-)
diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 5c72fba797..b4b7aa1928 100644
--- a/lib/librte_vhost/rte_vhost.h
+++ b/lib/librte_vhost/rte_vhost.h
@@ -85,6 +85,10 @@ extern "C" {
#define VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD 12
#endif
+#ifndef VHOST_USER_PROTOCOL_F_STATUS
+#define VHOST_USER_PROTOCOL_F_STATUS 15
+#endif
+
/** Indicate whether protocol features negotiation is supported. */
#ifndef VHOST_USER_F_PROTOCOL_FEATURES
#define VHOST_USER_F_PROTOCOL_FEATURES 30
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index df98d15de6..9a9c0a98f5 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -202,6 +202,14 @@ struct vhost_virtqueue {
TAILQ_HEAD(, vhost_iotlb_entry) iotlb_pending_list;
} __rte_cache_aligned;
+/* Virtio device status as per Virtio specification */
+#define VIRTIO_DEVICE_STATUS_ACK 0x01
+#define VIRTIO_DEVICE_STATUS_DRIVER 0x02
+#define VIRTIO_DEVICE_STATUS_DRIVER_OK 0x04
+#define VIRTIO_DEVICE_STATUS_FEATURES_OK 0x08
+#define VIRTIO_DEVICE_STATUS_DEV_NEED_RESET 0x40
+#define VIRTIO_DEVICE_STATUS_FAILED 0x80
+
/* Old kernels have no such macros defined */
#ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
#define VIRTIO_NET_F_GUEST_ANNOUNCE 21
@@ -364,6 +372,7 @@ struct virtio_net {
uint64_t log_addr;
struct rte_ether_addr mac;
uint16_t mtu;
+ uint8_t status;
struct vhost_device_ops const *notify_ops;
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 4a847f368c..e5a44be58d 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -87,6 +87,7 @@ static const char *vhost_message_str[VHOST_USER_MAX] = {
[VHOST_USER_POSTCOPY_END] = "VHOST_USER_POSTCOPY_END",
[VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
[VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
+ [VHOST_USER_SET_STATUS] = "VHOST_USER_SET_STATUS",
};
static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
@@ -1328,6 +1329,11 @@ virtio_is_ready(struct virtio_net *dev)
return 0;
}
+ /* If supported, ensure the frontend is really done with config */
+ if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS))
+ if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK))
+ return 0;
+
dev->flags |= VIRTIO_DEV_READY;
VHOST_LOG_CONFIG(INFO,
@@ -2425,6 +2431,39 @@ vhost_user_postcopy_end(struct virtio_net **pdev, struct
VhostUserMsg *msg,
return RTE_VHOST_MSG_RESULT_REPLY;
}
+static int
+vhost_user_set_status(struct virtio_net **pdev, struct VhostUserMsg *msg,
+ int main_fd __rte_unused)
+{
+ struct virtio_net *dev = *pdev;
+
+ /* As per Virtio specification, the device status is 8bits long */
+ if (msg->payload.u64 > UINT8_MAX) {
+ VHOST_LOG_CONFIG(ERR, "Invalid VHOST_USER_SET_STATUS payload
0x%" PRIx64 "\n",
+ msg->payload.u64);
+ return RTE_VHOST_MSG_RESULT_ERR;
+ }
+
+ dev->status = msg->payload.u64;
+
+ VHOST_LOG_CONFIG(INFO, "New device status(0x%08x):\n"
+ "\t-ACKNOWLEDGE: %u\n"
+ "\t-DRIVER: %u\n"
+ "\t-FEATURES_OK: %u\n"
+ "\t-DRIVER_OK: %u\n"
+ "\t-DEVICE_NEED_RESET: %u\n"
+ "\t-FAILED: %u\n",
+ dev->status,
+ !!(dev->status & VIRTIO_DEVICE_STATUS_ACK),
+ !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER),
+ !!(dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK),
+ !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK),
+ !!(dev->status & VIRTIO_DEVICE_STATUS_DEV_NEED_RESET),
+ !!(dev->status & VIRTIO_DEVICE_STATUS_FAILED));
+
+ return RTE_VHOST_MSG_RESULT_OK;
+}
+
typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
struct VhostUserMsg *msg,
int main_fd);
@@ -2457,6 +2496,7 @@ static vhost_message_handler_t
vhost_message_handlers[VHOST_USER_MAX] = {
[VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
[VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
[VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
+ [VHOST_USER_SET_STATUS] = vhost_user_set_status,
};
/* return bytes# of read on success or negative val on failure. */
diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h
index 1f65efa4a9..74fd361e3a 100644
--- a/lib/librte_vhost/vhost_user.h
+++ b/lib/librte_vhost/vhost_user.h
@@ -23,7 +23,8 @@
(1ULL <<
VHOST_USER_PROTOCOL_F_CRYPTO_SESSION) | \
(1ULL <<
VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) | \
(1ULL <<
VHOST_USER_PROTOCOL_F_HOST_NOTIFIER) | \
- (1ULL <<
VHOST_USER_PROTOCOL_F_PAGEFAULT))
+ (1ULL <<
VHOST_USER_PROTOCOL_F_PAGEFAULT) | \
+ (1ULL << VHOST_USER_PROTOCOL_F_STATUS))
typedef enum VhostUserRequest {
VHOST_USER_NONE = 0,
@@ -56,7 +57,8 @@ typedef enum VhostUserRequest {
VHOST_USER_POSTCOPY_END = 30,
VHOST_USER_GET_INFLIGHT_FD = 31,
VHOST_USER_SET_INFLIGHT_FD = 32,
- VHOST_USER_MAX = 33
+ VHOST_USER_SET_STATUS = 36,
+ VHOST_USER_MAX = 37
} VhostUserRequest;
typedef enum VhostUserSlaveRequest {
--
2.25.4
