freebsd-dev/etc/devd/hyperv.conf

# $FreeBSD$
#
# Hyper-V specific events

notify 10 {
	match "system"		"DEVFS";
	match "subsystem"	"CDEV";
	match "type"		"CREATE";
	match "cdev"		"hv_kvp_dev";
	action "/usr/sbin/hv_kvp_daemon";
};

notify 10 {
	match "system"		"DEVFS";
	match "subsystem"	"CDEV";
	match "type"		"DESTROY";
	match "cdev"		"hv_kvp_dev";
	action "pkill -x hv_kvp_daemon";
};

notify 11 {
	match "system"		"DEVFS";
	match "subsystem"	"CDEV";
	match "type"		"CREATE";
	match "cdev"		"hv_fsvss_dev";
	action "/usr/sbin/hv_vss_daemon";
};

notify 11 {
	match "system"		"DEVFS";
	match "subsystem"	"CDEV";
	match "type"		"DESTROY";
	match "cdev"		"hv_fsvss_dev";
	action "pkill -x hv_vss_daemon";
};

#
# Rules for non-transparent network VF.
#
# How network VF works with hn(4) on Hyper-V in non-transparent mode:
#
# - Each network VF has a cooresponding hn(4).
# - The network VF and the it's cooresponding hn(4) have the same hardware
#   address.
# - Once the network VF is up, e.g. ifconfig VF up:
#   o  All of the transmission should go through the network VF.
#   o  Most of the reception goes through the network VF.
#   o  Small amount of reception may go through the cooresponding hn(4).
#      This reception will happen, even if the the cooresponding hn(4) is
#      down.  The cooresponding hn(4) will change the reception interface
#      to the network VF, so that network layer and application layer will
#      be tricked into thinking that these packets were received by the
#      network VF.
#   o  The cooresponding hn(4) pretends the physical link is down.
# - Once the network VF is down or detached:
#   o  All of the transmission should go through the cooresponding hn(4).
#   o  All of the reception goes through the cooresponding hn(4).
#   o  The cooresponding hn(4) fallbacks to the original physical link
#      detection logic.
#
# All these features are mainly used to help live migration, during which
# the network VF will be detached, while the network communication to the
# VM must not be cut off.  In order to reach this level of live migration
# transparency, we use failover mode lagg(4) with the network VF and the
# cooresponding hn(4) attached to it.
#
# To ease user configuration for both network VF and non-network VF, the
# lagg(4) will be created by the following rules, and the configuration
# of the cooresponding hn(4) will be applied to the lagg(4) automatically.
#
# NOTE:
# If live migration is not needed at all, the following rules could be
# commented out, and the network VF interface could be used exclusively.
# Most often the cooresponding hn(4) could be completely ignored.
#
#
# Default workflow for the network VF bringup:
# 1) ETHERNET/IFATTACH -> VF interface up (delayed by rc.conf hyperv_vf_delay
#    seconds).  This operation will trigger HYPERV_NIC_VF/VF_UP.
# 2) HYPERV_NIC_VF/VF_UP:
#    a) Create laggX coresponding to hnX.
#    b) Add hnX and VF to laggX.
#    c) Whack all previous network configuration on hnX, including stopping
#       dhclient.
#    d) Apply rc.conf ifconfig_hnX to laggX; i.e. including starting dhclient.
#
# NOTE:
# HYPERV_NIC_VF/VF_UP action script could be customized per-interface by
# adding /usr/libexec/hyperv/hyperv_vfup.hnX script.
# /usr/libexec/hyperv/hyperv_vfup could be used as the template for the
# customized per-interface script.
#
# NOTE:
# For transparent network VF, hyperv_vfattach does nothing and
# HYPERV_NIC_VF/VF_UP will not be triggered at all.
#

notify 10 {
	match "system"		"HYPERV_NIC_VF";
	match "type"		"VF_UP";
	action "/usr/libexec/hyperv/hyperv_vfup $subsystem";
};

notify 10 {
	match "system"		"ETHERNET";
	match "type"		"IFATTACH";
	action "/usr/libexec/hyperv/hyperv_vfattach $subsystem 0";
};