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Message-ID: <20240801015914-mutt-send-email-mst@kernel.org>
Date: Thu, 1 Aug 2024 02:05:54 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: xuanzhuo@...ux.alibaba.com, eperezma@...hat.com, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
virtualization@...ts.linux.dev, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Venkat Venkatsubra <venkat.x.venkatsubra@...cle.com>,
Gia-Khanh Nguyen <gia-khanh.nguyen@...cle.com>
Subject: Re: [PATCH V4 net-next 3/3] virtio-net: synchronize operstate with
admin state on up/down
On Wed, Jul 31, 2024 at 10:59:47AM +0800, Jason Wang wrote:
> 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 | 84 ++++++++++++++++++++++++++--------------
> 1 file changed, 54 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 0383a3e136d6..0cb93261eba1 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2878,6 +2878,7 @@ static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
> return err;
> }
>
> +
> static void virtnet_cancel_dim(struct virtnet_info *vi, struct dim *dim)
> {
> if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
> @@ -2885,6 +2886,25 @@ static void virtnet_cancel_dim(struct virtnet_info *vi, struct dim *dim)
> net_dim_work_cancel(dim);
> }
>
> +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);
> @@ -2903,6 +2923,16 @@ static int virtnet_open(struct net_device *dev)
> goto err_enable_qp;
> }
>
> + if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
> + if (vi->status & VIRTIO_NET_S_LINK_UP)
> + netif_carrier_on(vi->dev);
> + virtio_config_driver_enable(vi->vdev);
> + } else {
> + vi->status = VIRTIO_NET_S_LINK_UP;
> + netif_carrier_on(dev);
> + virtnet_update_settings(vi);
> + }
> +
> return 0;
>
> err_enable_qp:
> @@ -3381,12 +3411,18 @@ 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 */
> + virtio_config_driver_disable(vi->vdev);
> + /* 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);
> virtnet_cancel_dim(vi, &vi->rq[i].dim);
> }
>
> + netif_carrier_off(dev);
> +
> return 0;
> }
>
> @@ -5085,25 +5121,6 @@ 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;
> @@ -6514,6 +6531,11 @@ static int virtnet_probe(struct virtio_device *vdev)
> goto free_failover;
> }
>
> + /* Forbid config change notification until ndo_open. */
> + virtio_config_driver_disable(vi->vdev);
> + /* Make sure status updating work is done */
Wait a second, how can anything run here, this is probe,
config change callbacks are never invoked at all.
> + cancel_work_sync(&vi->config_work);
> +
this is pointless, too.
> virtio_device_ready(vdev);
>
> virtnet_set_queues(vi, vi->curr_queue_pairs);
> @@ -6563,6 +6585,19 @@ static int virtnet_probe(struct virtio_device *vdev)
> vi->device_stats_cap = le64_to_cpu(v);
> }
>
> + /* 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)) {
> + /* This is safe as config notification change has been
> + disabled. */
What "this"? pls explain what this does: get config data from
device.
Actually not because it was disabled. probe can poke at
config with impunity no change callbacks trigger during probe.
> + virtnet_config_changed_work(&vi->config_work);
> + } else {
> + vi->status = VIRTIO_NET_S_LINK_UP;
> + virtnet_update_settings(vi);
> + netif_carrier_on(dev);
> + }
> +
> rtnl_unlock();
>
> err = virtnet_cpu_notif_add(vi);
> @@ -6571,17 +6606,6 @@ 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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