[dpdk-stable] [PATCH 1/3] net/virtio: fix wrong MSI-X for modern devices

[dpdk-stable] [PATCH 1/3] net/virtio: fix wrong MSI-X for modern devices

[Jianfeng Tan]

The field, use_msix, in struct virtio_hw is not updated for modern
device, and is always zero. And now we depend on the status feature
and MSI-X to report LSC support (which is also not a correct
behavior). As a result, LSC is always disabled for modern devices.

Te fix this, we just recognize MSI-X capability when going through
capability list, and update the info in virtio.

Fixes: 6ba1f63b5ab0 ("virtio: support specification 1.0")
Cc: stable@dpdk.org

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 drivers/net/virtio/virtio_pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index b767c03..ecad46e 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -50,6 +50,7 @@
  */
 #define PCI_CAPABILITY_LIST	0x34
 #define PCI_CAP_ID_VNDR		0x09
+#define PCI_CAP_ID_MSIX		0x11
 
 /*
  * The remaining space is defined by each driver as the per-driver
@@ -650,6 +651,9 @@ virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw)
 			break;
 		}
 
+		if (cap.cap_vndr == PCI_CAP_ID_MSIX)
+			hw->use_msix = 1;
+
 		if (cap.cap_vndr != PCI_CAP_ID_VNDR) {
 			PMD_INIT_LOG(DEBUG,
 				"[%2x] skipping non VNDR cap id: %02x",
-- 
2.7.4

[dpdk-stable] [PATCH 3/3] net/virtio: fix link status always being down

[Jianfeng Tan]

The virtio port link status will always be DOWN:

The commit aa9f06061765 ("net/virtio: fix link status always being up")
introduces a flag to help checking the status. If this flag is not set,
status will be always down. However, in dev start, this flag is set
after link status update, then we miss the chance to change the status
to UP in dev start.

To fix this bug, we simply move the link status update after the flag
setting so that the status can be correctly updated.

Fixes: aa9f06061765 ("net/virtio: fix link status always being up")
Cc: stable@dpdk.org

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index e79748e..cd87c0e 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1742,9 +1742,6 @@ virtio_dev_start(struct rte_eth_dev *dev)
 		}
 	}
 
-	/* Initialize Link state */
-	virtio_dev_link_update(dev, 0);
-
 	/*Notify the backend
 	 *Otherwise the tap backend might already stop its queue due to fullness.
 	 *vhost backend will have no chance to be waked up
@@ -1773,8 +1770,12 @@ virtio_dev_start(struct rte_eth_dev *dev)
 		txvq = dev->data->tx_queues[i];
 		VIRTQUEUE_DUMP(txvq->vq);
 	}
+
 	hw->started = 1;
 
+	/* Initialize Link state */
+	virtio_dev_link_update(dev, 0);
+
 	return 0;
 }
 
-- 
2.7.4

[dpdk-stable] [PATCH v2 1/4] net/virtio: fix wrong MSI-X for modern devices

[Jianfeng Tan]

The field, use_msix, in struct virtio_hw is not updated for modern
device, and is always zero. And now we depend on the status feature
and MSI-X to report LSC support (which is also not a correct
behavior). As a result, LSC is always disabled for modern devices.

Te fix this, we just recognize MSI-X capability when going through
capability list, and update the info in virtio.

Fixes: 6ba1f63b5ab0 ("virtio: support specification 1.0")
Cc: stable@dpdk.org

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 drivers/net/virtio/virtio_pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index b767c03..ecad46e 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -50,6 +50,7 @@
  */
 #define PCI_CAPABILITY_LIST	0x34
 #define PCI_CAP_ID_VNDR		0x09
+#define PCI_CAP_ID_MSIX		0x11
 
 /*
  * The remaining space is defined by each driver as the per-driver
@@ -650,6 +651,9 @@ virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw)
 			break;
 		}
 
+		if (cap.cap_vndr == PCI_CAP_ID_MSIX)
+			hw->use_msix = 1;
+
 		if (cap.cap_vndr != PCI_CAP_ID_VNDR) {
 			PMD_INIT_LOG(DEBUG,
 				"[%2x] skipping non VNDR cap id: %02x",
-- 
2.7.4

[dpdk-stable] [PATCH v2 4/4] net/virtio: fix link status always being down

[Jianfeng Tan]

The virtio port link status will always be DOWN:

The commit aa9f06061765 ("net/virtio: fix link status always being up")
introduces a flag to help checking the status. If this flag is not set,
status will be always down. However, in dev start, this flag is set
after link status update, then we miss the chance to change the status
to UP in dev start.

To fix this bug, we simply move the link status update after the flag
setting so that the status can be correctly updated.

Fixes: aa9f06061765 ("net/virtio: fix link status always being up")
Cc: stable@dpdk.org

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index e79748e..cd87c0e 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1742,9 +1742,6 @@ virtio_dev_start(struct rte_eth_dev *dev)
 		}
 	}
 
-	/* Initialize Link state */
-	virtio_dev_link_update(dev, 0);
-
 	/*Notify the backend
 	 *Otherwise the tap backend might already stop its queue due to fullness.
 	 *vhost backend will have no chance to be waked up
@@ -1773,8 +1770,12 @@ virtio_dev_start(struct rte_eth_dev *dev)
 		txvq = dev->data->tx_queues[i];
 		VIRTQUEUE_DUMP(txvq->vq);
 	}
+
 	hw->started = 1;
 
+	/* Initialize Link state */
+	virtio_dev_link_update(dev, 0);
+
 	return 0;
 }
 
-- 
2.7.4