[ovs-dev] Delete Flows matching specific cookie - OpenFlow 1.3.5 Spec support by OpenVSwitch

Carlos Ferreira carlosmf.pt at gmail.com
Tue Apr 24 01:52:51 UTC 2018


@IWAMOTO

Hello IWAMOTO,
No, I do not get any kind of error from Ryu. I have also verified the
structure of the Openflow messages sent to the switch using Wireshark
and no anomalies were found. The packet was well structured.

@Darrell,

Darrel, thank you for the info. I tried to use the del-flows using the
"ovs-ofctl del-flows" command with the specific cookie and in fact, it
did work. I'm lost here, because it does not seems to work if the
communication is done via OpenFlow with a remote controller.



On 24 April 2018 at 02:42, Darrell Ball <dball at vmware.com> wrote:
> //You can verify that OVS supports deletion by cookie specification by checking these tests:
>
>  932: ofproto.at:1746    ofproto - del flows based on cookie
>  933: ofproto.at:1767    ofproto - del flows based on cookie mask
>
> // Run the tests using “make check” like this:
> sudo make check TESTSUITEFLAGS='932-933' -C _gcc
>
> //Look at what is being tested here:
> tests/ofproto.at
>
> Thanks Darrell
>
>
> On 4/23/18, 4:17 PM, "ovs-dev-bounces at openvswitch.org on behalf of Carlos Ferreira" <ovs-dev-bounces at openvswitch.org on behalf of carlosmf.pt at gmail.com> wrote:
>
>     Hello to all
>
>     According to the OpenFlow 1.3.5 spec, page 44 specifies the following:
>
>
>     "Modify and delete commands can also be filtered by cookie value, if
>     the cookie_mask field contains
>     a value other than 0. This constraint is that the bits specified by
>     the cookie_mask in both
>     the cookie field of the flow mod and a flow entry’s cookie value must
>     be equal. In other words,
>     (flow entry.cookie&flow mod.cookie mask) == (flow mod.cookie&flow
>     mod.cookie mask)."
>
>
>     Now, using the Ryu python-based controller, I tried to delete a flow
>     by specifying the flow's cookie value, but the procedure was not
>     successful.
>
>     The following code is a test-example which I used.
>
>         from ryu.base.app_manager import RyuApp
>         from ryu.controller.dpset import EventDP
>         from ryu.controller.handler import MAIN_DISPATCHER
>         from ryu.controller.handler import set_ev_cls
>         from ryu.ofproto import ofproto_v1_3
>         from ryu.ofproto import ether, inet
>
>         class MPLS_Testing(RyuApp):
>           OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
>
>           @set_ev_cls(EventDP, MAIN_DISPATCHER)
>           def switch_connect_event(self, ev):
>             ofp_parser = ev.dp.ofproto_parser
>             ofp = ev.dp.ofproto
>             datapath_obj = ev.dp
>             if ev.enter:
>               datapath_obj.send_msg(  # Removes all flows registered in this switch.
>                 ofp_parser.OFPFlowMod(
>                   datapath=datapath_obj,
>                   table_id=ofp.OFPTT_ALL,
>                   command=ofp.OFPFC_DELETE,
>                   out_port=ofp.OFPP_ANY,
>                   out_group=ofp.OFPG_ANY,
>                 )
>               )
>               add_label_flow = ofp_parser.OFPFlowMod(
>                 datapath=datapath_obj,
>                 cookie=1,
>                 table_id=0,
>                 command=ofp.OFPFC_ADD,
>                 match=ofp_parser.OFPMatch(
>                   in_port=1
>                 ),
>                 instructions=[
>                   ofp_parser.OFPInstructionActions(
>                     ofp.OFPIT_APPLY_ACTIONS,
>                     [
>                       ofp_parser.OFPActionPushMpls(),
>                       ofp_parser.OFPActionSetField(mpls_label=16),
>                     ]
>                   ),
>                   ofp_parser.OFPInstructionGotoTable(table_id=1),
>                 ]
>               )
>               datapath_obj.send_msg(add_label_flow)
>
>               add_label_flow2 = ofp_parser.OFPFlowMod(
>                 datapath=datapath_obj,
>                 cookie=2,
>                 table_id=1,
>                 command=ofp.OFPFC_ADD,
>                 match=ofp_parser.OFPMatch(
>                   in_port=1
>                 ),
>                 instructions=[
>                   ofp_parser.OFPInstructionActions(
>                     ofp.OFPIT_APPLY_ACTIONS,
>                     [
>                       ofp_parser.OFPActionPushMpls(),
>                       ofp_parser.OFPActionSetField(mpls_label=12),
>                     ]
>                   ),
>                   ofp_parser.OFPInstructionGotoTable(table_id=2),
>                 ]
>               )
>               datapath_obj.send_msg(add_label_flow2)
>
>               # Deletes flow with cookie equal to 2.
>               datapath_obj.send_msg(
>                 ofp_parser.OFPFlowMod(
>                   cookie=2,
>                   cookie_mask=0xFFFFFFFFFFFFFFFF,
>                   datapath=datapath_obj,
>                   command=ofp.OFPFC_DELETE,
>                   out_port=ofp.OFPP_ANY,
>                   out_group=ofp.OFPG_ANY,
>                 )
>               )
>
>     Can anyone tell me if OpenVSwitch 2.9 supports cookie match when
>     deleting a flow from the tables? OpenFlow 1.3.5 spec clearly states
>     that a Delete command could also filter flows using the cookie value,
>     when the cookie_mask is different than zero. Currently, I'm kinda lost
>     here.
>
>     Thank you!
>
>     --
>
>     Carlos Miguel Ferreira
>     Researcher at Telecommunications Institute
>     Aveiro - Portugal
>     Work E-mail - cmf at av.it.pt
>     Skype & GTalk -> carlosmf.pt at gmail.com
>     LinkedIn -> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.linkedin.com_in_carlosmferreira&d=DwIGaQ&c=uilaK90D4TOVoH58JNXRgQ&r=BVhFA09CGX7JQ5Ih-uZnsw&m=ND4lqlTir-Ukyp2WkESK_WJ7j0b1dAUdptpdObaFU7Y&s=saz4uZw1U4C3pxnJSK9cRxTNXucuBUokJFvgmL3P3Wg&e=
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>



-- 

Carlos Miguel Ferreira
Researcher at Telecommunications Institute
Aveiro - Portugal
Work E-mail - cmf at av.it.pt
Skype & GTalk -> carlosmf.pt at gmail.com
LinkedIn -> http://www.linkedin.com/in/carlosmferreira


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