On 2025-03-01 at 04:11:59, longli@xxxxxxxxxxxxxxxxx (longli@xxxxxxxxxxxxxxxxx) wrote:
> From: Long Li <longli@xxxxxxxxxxxxx>
>
> When running under Hyper-V, the master device to the RDMA device is always
> bonded to this RDMA device if it's present in the kernel. This is not
> user-configurable.
>
> The master device can be unbind/bind from the kernel. During those events,
> the RDMA device should set to the current netdev to relect the change of
> master device from those events.
>
> Signed-off-by: Long Li <longli@xxxxxxxxxxxxx>
> ---
> drivers/infiniband/hw/mana/device.c | 35 ++++++++++++++++++++++++++++
> drivers/infiniband/hw/mana/mana_ib.h | 1 +
> 2 files changed, 36 insertions(+)
>
> diff --git a/drivers/infiniband/hw/mana/device.c b/drivers/infiniband/hw/mana/device.c
> index 3416a85f8738..3e4f069c2258 100644
> --- a/drivers/infiniband/hw/mana/device.c
> +++ b/drivers/infiniband/hw/mana/device.c
> @@ -51,6 +51,37 @@ static const struct ib_device_ops mana_ib_dev_ops = {
> ib_ind_table),
> };
>
> +static int mana_ib_netdev_event(struct notifier_block *this,
> + unsigned long event, void *ptr)
> +{
> + struct mana_ib_dev *dev = container_of(this, struct mana_ib_dev, nb);
> + struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
> + struct gdma_context *gc = dev->gdma_dev->gdma_context;
> + struct mana_context *mc = gc->mana.driver_data;
> + struct net_device *ndev;
> +
> + if (event_dev != mc->ports[0])
> + return NOTIFY_DONE;
> +
> + switch (event) {
> + case NETDEV_CHANGEUPPER:
> + rcu_read_lock();
> + ndev = mana_get_primary_netdev_rcu(mc, 0);
> + rcu_read_unlock();
...
> +
> + /*
> + * RDMA core will setup GID based on updated netdev.
> + * It's not possible to race with the core as rtnl lock is being
> + * held.
> + */
> + ib_device_set_netdev(&dev->ib_dev, ndev, 1);
rcu_read_unlock() should be here, right ?
> +
> + return NOTIFY_OK;
> + default:
> + return NOTIFY_DONE;
> + }
> +}
> +
>
