[dpdk-dev] [PATCH v3 4/5] net/virtio-user: support to report net status

[Jianfeng Tan]

Originally, we did not report support of VIRTIO_NET_F_STATUS.
This feature is not reported by vhost backend, instead, it
is added/removed by QEMU in virtio PCI case.

We report the support of this feature so that following patch
will depend on this feature to enable LSC interrupt.

Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
---
 drivers/net/virtio/virtio_user/virtio_user_dev.c | 4 ++++
 drivers/net/virtio/virtio_user_ethdev.c          | 8 ++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c b/drivers/net/virtio/virtio_user/virtio_user_dev.c
index ce4ead0..6e26df0 100644
--- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
+++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
@@ -139,6 +139,7 @@ virtio_user_start_device(struct virtio_user_dev *dev)
 	features &= ~(1ull << VIRTIO_NET_F_MAC);
 	/* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
 	features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
+	features &= ~(1ull << VIRTIO_NET_F_STATUS);
 	ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
 	if (ret < 0)
 		goto error;
@@ -356,6 +357,9 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
 		dev->device_features &= ~(1ull << VIRTIO_NET_F_CTRL_MAC_ADDR);
 	}
 
+	/* The backend will not report this feature, we add it explicitly */
+	dev->device_features |= (1ull << VIRTIO_NET_F_STATUS);
+
 	return 0;
 }
 
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index 335d70d..e8b14e5 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -135,17 +135,17 @@ virtio_user_set_features(struct virtio_hw *hw, uint64_t features)
 static uint8_t
 virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
 {
-	/* When config interrupt happens, driver calls this function to query
-	 * what kinds of change happen. Interrupt mode not supported for now.
+	/* rxq interrupts and config interrupt are separated in virtio-user,
+	 * here we only report config change.
 	 */
-	return 0;
+	return VIRTIO_PCI_ISR_CONFIG;
 }
 
 static uint16_t
 virtio_user_set_config_irq(struct virtio_hw *hw __rte_unused,
 		    uint16_t vec __rte_unused)
 {
-	return VIRTIO_MSI_NO_VECTOR;
+	return 0;
 }
 
 static uint16_t
-- 
2.7.4