[dpdk-dev] [PATCH 3/3] net/virtio: add Virtio status support to Virtio-user

[Maxime Coquelin <maxime.coquelin@redhat.com>]

This patch adds support for VHOST_USER_SET_STATUS
request. It is used to make the backend aware of
Virtio devices status update.

It is useful for the backend to know when the Virtio
driver is done with the Virtio device configuration.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/virtio/virtio_user/vhost.h        |  5 +++++
 drivers/net/virtio/virtio_user/vhost_user.c   |  8 ++++++++
 .../net/virtio/virtio_user/virtio_user_dev.c  | 20 ++++++++++++++++++-
 .../net/virtio/virtio_user/virtio_user_dev.h  |  1 +
 drivers/net/virtio/virtio_user_ethdev.c       |  1 +
 5 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index 260e1c3081..fc360564eb 100644
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -57,6 +57,10 @@ struct vhost_vring_addr {
 #define VHOST_USER_PROTOCOL_F_REPLY_ACK 3
 #endif
 
+#ifndef VHOST_USER_PROTOCOL_F_STATUS
+#define VHOST_USER_PROTOCOL_F_STATUS 15
+#endif
+
 enum vhost_user_request {
 	VHOST_USER_NONE = 0,
 	VHOST_USER_GET_FEATURES = 1,
@@ -77,6 +81,7 @@ enum vhost_user_request {
 	VHOST_USER_SET_PROTOCOL_FEATURES = 16,
 	VHOST_USER_GET_QUEUE_NUM = 17,
 	VHOST_USER_SET_VRING_ENABLE = 18,
+	VHOST_USER_SET_STATUS = 36,
 	VHOST_USER_MAX
 };
 
diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index f8d751c98e..68232d75d7 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -278,6 +278,14 @@ vhost_user_sock(struct virtio_user_dev *dev,
 		need_reply = 1;
 		break;
 
+	case VHOST_USER_SET_STATUS:
+		if (!(dev->protocol_features &
+				(1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
+			return 0;
+
+		if (has_reply_ack)
+			msg.flags |= VHOST_USER_NEED_REPLY_MASK;
+		/* Fallthrough */
 	case VHOST_USER_SET_FEATURES:
 	case VHOST_USER_SET_PROTOCOL_FEATURES:
 	case VHOST_USER_SET_LOG_BASE:
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index ea22af5dc4..cf29ea0b88 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -424,7 +424,8 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
 
 #define VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES		\
 	(1ULL << VHOST_USER_PROTOCOL_F_MQ |		\
-	 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK)
+	 1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK |	\
+	 1ULL << VHOST_USER_PROTOCOL_F_STATUS)
 
 int
 virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
@@ -782,3 +783,20 @@ virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
 		__atomic_add_fetch(&vring->used->idx, 1, __ATOMIC_RELAXED);
 	}
 }
+
+int
+virtio_user_update_status(struct virtio_user_dev *dev, uint8_t status)
+{
+	int ret;
+	uint64_t arg = status;
+
+	/* Vhost-user only for now */
+	if (!is_vhost_user_by_type(dev->path))
+		return 0;
+
+	ret = dev->ops->send_request(dev, VHOST_USER_SET_STATUS, &arg);
+	if (ret)
+		return -1;
+
+	return 0;
+}
diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h b/drivers/net/virtio/virtio_user/virtio_user_dev.h
index 56e638f8a6..c49a896a88 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
@@ -71,4 +71,5 @@ void virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx);
 void virtio_user_handle_cq_packed(struct virtio_user_dev *dev,
 				  uint16_t queue_idx);
 uint8_t virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs);
+int virtio_user_update_status(struct virtio_user_dev *dev, uint8_t status);
 #endif
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index ccb5a18e25..bed161ba07 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -271,6 +271,7 @@ virtio_user_set_status(struct virtio_hw *hw, uint8_t status)
 	else if (status == VIRTIO_CONFIG_STATUS_RESET)
 		virtio_user_reset(hw);
 	dev->status = status;
+	virtio_user_update_status(dev, status);
 }
 
 static uint8_t
-- 
2.26.2