[dpdk-dev] [PATCH 3/5] net/virtio: add VIRTIO_SET_STATUS support to Virtio-user

[Adrian Moreno <amorenoz@redhat.com>]

From: 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>
Signed-off-by: Adrian Moreno <amorenoz@redhat.com>
---
 drivers/net/virtio/virtio_user/vhost.h        |  6 +++++
 drivers/net/virtio/virtio_user/vhost_user.c   | 10 ++++++++
 .../net/virtio/virtio_user/virtio_user_dev.c  | 23 ++++++++++++++++++-
 .../net/virtio/virtio_user/virtio_user_dev.h  |  1 +
 drivers/net/virtio/virtio_user_ethdev.c       |  1 +
 5 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index 260e1c308..8f49ef457 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 16
+#endif
+
 enum vhost_user_request {
 	VHOST_USER_NONE = 0,
 	VHOST_USER_GET_FEATURES = 1,
@@ -77,6 +81,8 @@ 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 = 39,
+	VHOST_USER_GET_STATUS = 40,
 	VHOST_USER_MAX
 };
 
diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index 631d0e353..2332e01d1 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -244,6 +244,8 @@ const char * const vhost_msg_strings[] = {
 	[VHOST_USER_SET_VRING_ENABLE] = "VHOST_SET_VRING_ENABLE",
 	[VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES",
 	[VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES",
+	[VHOST_USER_SET_STATUS] = "VHOST_SET_STATUS",
+	[VHOST_USER_GET_STATUS] = "VHOST_GET_STATUS",
 };
 
 static int
@@ -280,6 +282,14 @@ 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 0a6991bcc..2c400a448 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,
@@ -783,3 +784,23 @@ 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_send_status_update(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;
+
+	if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS)))
+		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 10b274d19..a76d7cfaf 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
@@ -74,4 +74,5 @@ 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_send_status_update(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 5b06d8e89..e52f11341 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -273,6 +273,7 @@ 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_send_status_update(dev, status);
 }
 
 static uint8_t
-- 
2.26.2