[dpdk-dev] [PATCH 6/9] vhost: add support for virtio status

[Maxime Coquelin]

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.coquelin at 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