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https://github.com/openvswitch/ovs
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aaca4fe0ce
The patch adds a new action to support packet truncation. The new action
is formatted as 'output(port=n,max_len=m)', as output to port n, with
packet size being MIN(original_size, m).
One use case is to enable port mirroring to send smaller packets to the
destination port so that only useful packet information is mirrored/copied,
saving some performance overhead of copying entire packet payload. Example
use case is below as well as shown in the testcases:
- Output to port 1 with max_len 100 bytes.
- The output packet size on port 1 will be MIN(original_packet_size, 100).
# ovs-ofctl add-flow br0 'actions=output(port=1,max_len=100)'
- The scope of max_len is limited to output action itself. The following
packet size of output:1 and output:2 will be intact.
# ovs-ofctl add-flow br0 \
'actions=output(port=1,max_len=100),output:1,output:2'
- The Datapath actions shows:
# Datapath actions: trunc(100),1,1,2
Tested-at: https://travis-ci.org/williamtu/ovs-travis/builds/140037134
Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
76 lines
2.8 KiB
Plaintext
76 lines
2.8 KiB
Plaintext
# _ADD_BR([name])
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#
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# Expands into the proper ovs-vsctl commands to create a bridge with the
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# appropriate type and properties
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m4_define([_ADD_BR], [[add-br $1 -- set Bridge $1 protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13,OpenFlow14,OpenFlow15 fail-mode=secure ]])
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# OVS_TRAFFIC_VSWITCHD_START([vsctl-args], [vsctl-output], [=override])
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#
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# Creates a database and starts ovsdb-server, starts ovs-vswitchd
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# connected to that database, calls ovs-vsctl to create a bridge named
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# br0 with predictable settings, passing 'vsctl-args' as additional
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# commands to ovs-vsctl. If 'vsctl-args' causes ovs-vsctl to provide
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# output (e.g. because it includes "create" commands) then 'vsctl-output'
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# specifies the expected output after filtering through uuidfilt.pl.
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#
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# Best-effort loading of all available vport modules is performed.
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#
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m4_define([OVS_TRAFFIC_VSWITCHD_START],
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[AT_CHECK([modprobe openvswitch])
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on_exit 'modprobe -r openvswitch'
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m4_foreach([mod], [[vport_geneve], [vport_gre], [vport_lisp], [vport_stt], [vport_vxlan]],
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[modprobe -q mod || echo "Module mod not loaded."
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on_exit 'modprobe -q -r mod'
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])
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on_exit 'ovs-dpctl del-dp ovs-system'
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_OVS_VSWITCHD_START([])
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dnl Add bridges, ports, etc.
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AT_CHECK([ovs-vsctl -- _ADD_BR([br0]) -- $1 m4_if([$2], [], [], [| ${PERL} $srcdir/uuidfilt.pl])], [0], [$2])
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])
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# OVS_TRAFFIC_VSWITCHD_STOP([WHITELIST], [extra_cmds])
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#
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# Gracefully stops ovs-vswitchd and ovsdb-server, checking their log files
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# for messages with severity WARN or higher and signaling an error if any
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# is present. The optional WHITELIST may contain shell-quoted "sed"
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# commands to delete any warnings that are actually expected, e.g.:
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#
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# OVS_TRAFFIC_VSWITCHD_STOP(["/expected error/d"])
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#
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# 'extra_cmds' are shell commands to be executed afte OVS_VSWITCHD_STOP() is
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# invoked. They can be used to perform additional cleanups such as name space
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# removal.
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m4_define([OVS_TRAFFIC_VSWITCHD_STOP],
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[OVS_VSWITCHD_STOP([$1])
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AT_CHECK([:; $2])
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])
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# CONFIGURE_VETH_OFFLOADS([VETH])
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#
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# The kernel datapath has no problem with offloads and veths. Nothing
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# to do here.
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m4_define([CONFIGURE_VETH_OFFLOADS],
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)
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# CHECK_CONNTRACK()
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#
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# Perform requirements checks for running conntrack tests, and flush the
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# kernel conntrack tables when the test is finished.
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#
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m4_define([CHECK_CONNTRACK],
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[AT_SKIP_IF([test $HAVE_PYTHON = no])
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m4_foreach([mod], [[nf_conntrack_ipv4], [nf_conntrack_ipv6], [nf_nat_ftp]],
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[modprobe mod || echo "Module mod not loaded."
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on_exit 'modprobe -r mod'
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])
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on_exit 'ovstest test-netlink-conntrack flush'
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]
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)
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# CHECK_KERNEL_DP, CHECK_USER_DP
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#
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# Ignore the CHECK_USER_DP and execute the CHECK_KERNEL_DP
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#
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m4_define([CHECK_KERNEL_DP], [$1])
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m4_define([CHECK_USER_DP], [])
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