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Message-ID: <20240520010302.68611-1-jasowang@redhat.com>
Date: Mon, 20 May 2024 09:03:02 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com,
jasowang@...hat.com,
xuanzhuo@...ux.alibaba.com
Cc: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
virtualization@...ts.linux.dev,
netdev@...r.kernel.org,
Venkat Venkatsubra <venkat.x.venkatsubra@...cle.com>,
Gia-Khanh Nguyen <gia-khanh.nguyen@...cle.com>
Subject: [PATCH net-next] virtio-net: synchronize operstate with admin state on up/down
This patch synchronize operstate with admin state per RFC2863.
This is done by trying to toggle the carrier upon open/close and
synchronize with the config change work. This allows propagate status
correctly to stacked devices like:
ip link add link enp0s3 macvlan0 type macvlan
ip link set link enp0s3 down
ip link show
Before this patch:
3: enp0s3: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
link/ether 00:00:05:00:00:09 brd ff:ff:ff:ff:ff:ff
......
5: macvlan0@...0s3: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether b2:a9:c5:04:da:53 brd ff:ff:ff:ff:ff:ff
After this patch:
3: enp0s3: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
link/ether 00:00:05:00:00:09 brd ff:ff:ff:ff:ff:ff
...
5: macvlan0@...0s3: <NO-CARRIER,BROADCAST,MULTICAST,UP,M-DOWN> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
link/ether b2:a9:c5:04:da:53 brd ff:ff:ff:ff:ff:ff
Cc: Venkat Venkatsubra <venkat.x.venkatsubra@...cle.com>
Cc: Gia-Khanh Nguyen <gia-khanh.nguyen@...cle.com>
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
drivers/net/virtio_net.c | 94 +++++++++++++++++++++++++++-------------
1 file changed, 63 insertions(+), 31 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 4e1a0fc0d555..24d880a5023d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -433,6 +433,12 @@ struct virtnet_info {
/* The lock to synchronize the access to refill_enabled */
spinlock_t refill_lock;
+ /* Is config change enabled? */
+ bool config_change_enabled;
+
+ /* The lock to synchronize the access to config_change_enabled */
+ spinlock_t config_change_lock;
+
/* Work struct for config space updates */
struct work_struct config_work;
@@ -623,6 +629,20 @@ static void disable_delayed_refill(struct virtnet_info *vi)
spin_unlock_bh(&vi->refill_lock);
}
+static void enable_config_change(struct virtnet_info *vi)
+{
+ spin_lock_irq(&vi->config_change_lock);
+ vi->config_change_enabled = true;
+ spin_unlock_irq(&vi->config_change_lock);
+}
+
+static void disable_config_change(struct virtnet_info *vi)
+{
+ spin_lock_irq(&vi->config_change_lock);
+ vi->config_change_enabled = false;
+ spin_unlock_irq(&vi->config_change_lock);
+}
+
static void enable_rx_mode_work(struct virtnet_info *vi)
{
rtnl_lock();
@@ -2421,6 +2441,25 @@ static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
return err;
}
+static void virtnet_update_settings(struct virtnet_info *vi)
+{
+ u32 speed;
+ u8 duplex;
+
+ if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
+ return;
+
+ virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
+
+ if (ethtool_validate_speed(speed))
+ vi->speed = speed;
+
+ virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
+
+ if (ethtool_validate_duplex(duplex))
+ vi->duplex = duplex;
+}
+
static int virtnet_open(struct net_device *dev)
{
struct virtnet_info *vi = netdev_priv(dev);
@@ -2439,6 +2478,18 @@ static int virtnet_open(struct net_device *dev)
goto err_enable_qp;
}
+ /* Assume link up if device can't report link status,
+ otherwise get link status from config. */
+ netif_carrier_off(dev);
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
+ enable_config_change(vi);
+ schedule_work(&vi->config_work);
+ } else {
+ vi->status = VIRTIO_NET_S_LINK_UP;
+ virtnet_update_settings(vi);
+ netif_carrier_on(dev);
+ }
+
return 0;
err_enable_qp:
@@ -2875,12 +2926,19 @@ static int virtnet_close(struct net_device *dev)
disable_delayed_refill(vi);
/* Make sure refill_work doesn't re-enable napi! */
cancel_delayed_work_sync(&vi->refill);
+ /* Make sure config notification doesn't schedule config work */
+ disable_config_change(vi);
+ /* Make sure status updating is cancelled */
+ cancel_work_sync(&vi->config_work);
for (i = 0; i < vi->max_queue_pairs; i++) {
virtnet_disable_queue_pair(vi, i);
cancel_work_sync(&vi->rq[i].dim.work);
}
+ vi->status &= ~VIRTIO_NET_S_LINK_UP;
+ netif_carrier_off(dev);
+
return 0;
}
@@ -4583,25 +4641,6 @@ static void virtnet_init_settings(struct net_device *dev)
vi->duplex = DUPLEX_UNKNOWN;
}
-static void virtnet_update_settings(struct virtnet_info *vi)
-{
- u32 speed;
- u8 duplex;
-
- if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
- return;
-
- virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
-
- if (ethtool_validate_speed(speed))
- vi->speed = speed;
-
- virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
-
- if (ethtool_validate_duplex(duplex))
- vi->duplex = duplex;
-}
-
static u32 virtnet_get_rxfh_key_size(struct net_device *dev)
{
return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size;
@@ -5163,7 +5202,10 @@ static void virtnet_config_changed(struct virtio_device *vdev)
{
struct virtnet_info *vi = vdev->priv;
- schedule_work(&vi->config_work);
+ spin_lock_irq(&vi->config_change_lock);
+ if (vi->config_change_enabled)
+ schedule_work(&vi->config_work);
+ spin_unlock_irq(&vi->config_change_lock);
}
static void virtnet_free_queues(struct virtnet_info *vi)
@@ -5706,6 +5748,7 @@ static int virtnet_probe(struct virtio_device *vdev)
INIT_WORK(&vi->config_work, virtnet_config_changed_work);
INIT_WORK(&vi->rx_mode_work, virtnet_rx_mode_work);
spin_lock_init(&vi->refill_lock);
+ spin_lock_init(&vi->config_change_lock);
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) {
vi->mergeable_rx_bufs = true;
@@ -5901,17 +5944,6 @@ static int virtnet_probe(struct virtio_device *vdev)
goto free_unregister_netdev;
}
- /* Assume link up if device can't report link status,
- otherwise get link status from config. */
- netif_carrier_off(dev);
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
- schedule_work(&vi->config_work);
- } else {
- vi->status = VIRTIO_NET_S_LINK_UP;
- virtnet_update_settings(vi);
- netif_carrier_on(dev);
- }
-
for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
if (virtio_has_feature(vi->vdev, guest_offloads[i]))
set_bit(guest_offloads[i], &vi->guest_offloads);
--
2.31.1
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