system-userspace-macros.at

# _ADD_BR([name])
#
# Expands into the proper ovs-vsctl commands to create a bridge with the
# appropriate type and properties
m4_define([_ADD_BR], [[add-br $1 -- set Bridge $1 datapath_type="netdev" protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13,OpenFlow14,OpenFlow15 fail-mode=secure ]])

# OVS_TRAFFIC_VSWITCHD_START([vsctl-args], [vsctl-output], [=override])
#
# Creates a database and starts ovsdb-server, starts ovs-vswitchd
# connected to that database, calls ovs-vsctl to create a bridge named
# br0 with predictable settings, passing 'vsctl-args' as additional
# commands to ovs-vsctl.  If 'vsctl-args' causes ovs-vsctl to provide
# output (e.g. because it includes "create" commands) then 'vsctl-output'
# specifies the expected output after filtering through uuidfilt.pl.
m4_define([OVS_TRAFFIC_VSWITCHD_START],
  [
   OVS_WAIT_WHILE([ip link show ovs-netdev])
   _OVS_VSWITCHD_START([--disable-system])
   dnl Add bridges, ports, etc.
   OVS_WAIT_WHILE([ip link show br0])
   AT_CHECK([ovs-vsctl -- _ADD_BR([br0]) -- $1 m4_if([$2], [], [], [| ${PERL} $srcdir/uuidfilt.pl])], [0], [$2])
])

# OVS_TRAFFIC_VSWITCHD_STOP([WHITELIST], [extra_cmds])
#
# Gracefully stops ovs-vswitchd and ovsdb-server, checking their log files
# for messages with severity WARN or higher and signaling an error if any
# is present.  The optional WHITELIST may contain shell-quoted "sed"
# commands to delete any warnings that are actually expected, e.g.:
#
#   OVS_TRAFFIC_VSWITCHD_STOP(["/expected error/d"])
#
# 'extra_cmds' are shell commands to be executed afte OVS_VSWITCHD_STOP() is
# invoked. They can be used to perform additional cleanups such as name space
# removal.
m4_define([OVS_TRAFFIC_VSWITCHD_STOP],
  [OVS_VSWITCHD_STOP([dnl
"/netdev_linux.*obtaining netdev stats via vport failed/d
/dpif_netlink.*Generic Netlink family 'ovs_datapath' does not exist. The Open vSwitch kernel module is probably not loaded./d"])
   AT_CHECK([:; $2])
  ])

# CONFIGURE_VETH_OFFLOADS([VETH])
#
# Disable TX offloads for veths.  The userspace datapath uses the AF_PACKET
# socket to receive packets for veths.  Unfortunately, the AF_PACKET socket
# doesn't play well with offloads:
# 1. GSO packets are received without segmentation and therefore discarded.
# 2. Packets with offloaded partial checksum are received with the wrong
#    checksum, therefore discarded by the receiver.
#
# By disabling tx offloads in the non-OVS side of the veth peer we make sure
# that the AF_PACKET socket will not receive bad packets.
#
# This is a workaround, and should be removed when offloads are properly
# supported in netdev-linux.
m4_define([CONFIGURE_VETH_OFFLOADS],
    [ethtool -K $1 tx off]
)

# CHECK_CONNTRACK()
#
# Perform requirements checks for running conntrack tests, and flush the
# kernel conntrack tables when the test is finished.
#
m4_define([CHECK_CONNTRACK],
    [AT_SKIP_IF(true)]
)

# CHECK_KERNEL_DP, CHECK_USER_DP
#
# Ignore the CHECK_KERNEL_DP and execute the CHECK_USER_DP
#
m4_define([CHECK_KERNEL_DP], [])
m4_define([CHECK_USER_DP], [$1])