Dexuan Cui <decui@xxxxxxxxxxxxx> writes:
> For now only 1 event is defined: HVSOCK_RESCIND_CHANNEL.
> We'll have more events in the future.
>
> Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
> ---
> drivers/hv/channel_mgmt.c | 18 ++++++++++++++++++
> include/linux/hyperv.h | 17 +++++++++++++++++
> 2 files changed, 35 insertions(+)
>
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index 4611b50..87fc7d2 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -608,6 +608,16 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
> spin_unlock_irqrestore(&channel->lock, flags);
>
> if (channel->device_obj) {
> + if (is_hvsock_channel(channel) &&
> + channel->hvsock_event_callback) {
> + channel->hvsock_event_callback(channel,
> + HVSOCK_RESCIND_CHANNEL);
> + /*
> + * We can't invoke vmbus_device_unregister()
> + * until the socket fd is closed.
> + */
> + return;
> + }
> /*
> * We will have to unregister this device from the
> * driver core.
> @@ -977,3 +987,11 @@ bool vmbus_are_subchannels_present(struct vmbus_channel *primary)
> return ret;
> }
> EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present);
> +
> +void vmbus_set_hvsock_event_callback(struct vmbus_channel *channel,
> + void (*hvsock_event_callback)(struct vmbus_channel *,
> + enum hvsock_event))
> +{
> + channel->hvsock_event_callback = hvsock_event_callback;
> +}
> +EXPORT_SYMBOL_GPL(vmbus_set_hvsock_event_callback);
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index b4cc44c..7e507bb 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -645,6 +645,12 @@ enum hv_signal_policy {
> HV_SIGNAL_POLICY_EXPLICIT,
> };
>
> +/* hvsock related definitions */
> +enum hvsock_event {
> + /* The host application is close()-ing the connection */
> + HVSOCK_RESCIND_CHANNEL,
> +};
> +
> struct vmbus_channel {
> /* Unique channel id */
> int id;
> @@ -740,6 +746,13 @@ struct vmbus_channel {
> void (*sc_creation_callback)(struct vmbus_channel *new_sc);
>
> /*
> + * hvsock event callback.
> + * For now only 1 event is defined: HVSOCK_RESCIND_CHANNEL.
> + */
> + void (*hvsock_event_callback)(struct vmbus_channel *channel,
> + enum hvsock_event event);
Would it make sense to rename it to something more general,
e.g. sc_rescind_callback and call it for all drivers (even if we don't
need it now) intead of introducing enum hvsock_event? When new events
arrive we'll just add new callbacks (or, alternatively, we could unify
it to 'channel_event_callback' and merging with sc_creation_callback()
but I'd say it is uglier).
> +
> + /*
> * The spinlock to protect the structure. It is being used to protect
> * test-and-set access to various attributes of the structure as well
> * as all sc_list operations.
> @@ -825,6 +838,10 @@ int vmbus_request_offers(void);
> void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
> void (*sc_cr_cb)(struct vmbus_channel *new_sc));
>
> +void vmbus_set_hvsock_event_callback(struct vmbus_channel *channel,
> + void (*hvsock_event_callback)(struct vmbus_channel *,
> + enum hvsock_event));
> +
> /*
> * Retrieve the (sub) channel on which to send an outgoing request.
> * When a primary channel has multiple sub-channels, we choose a
--
Vitaly
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