<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Hi Ashish Varma, </div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">I think I have misunderstand the experimental message and nxm_match. <br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">The match field is only contained in "flow_mod" or other messages. </div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">But experimental openflow message could not be "flow_mod" message. For example, it could be "nxm_set_packet_in" message.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Thanks. Regards</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">kai xi fan <<a href="mailto:kaixi.f@gmail.com">kaixi.f@gmail.com</a>> 于2019年9月4日周三 下午12:12写道:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Hi Ashish Varma,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">I have read the document as <a href="https://patchwork.ozlabs.org/patch/1145870/" style="font-family:Arial,Helvetica,sans-serif" target="_blank">https://patchwork.ozlabs.org/patch/1145870/</a></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">When controller wants to send a flow to ovs through openflow, and the flow both contains nicira match and openflow match. What's the value of "message type" in "struct ofp_header".</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Do the message contain both nxm_match and oxm_match structures ?</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">thanks. Regards</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">kai xi fan <<a href="mailto:kaixi.f@gmail.com" target="_blank">kaixi.f@gmail.com</a>> 于2019年8月21日周三 下午2:42写道:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Many thanks. I will check that.</div><div class="gmail_default" style="font-size:small"><font face="verdana, sans-serif">The "</font><span style="font-family:Arial,Helvetica,sans-serif">nxm_packet_in_2" packet_in format contains userdata field. It could be used to save arp or dhcp data corresponded to the host in the flow. Then the controller do not need to constructor these caches.</span></div><div class="gmail_default" style="font-size:small"><span style="font-family:Arial,Helvetica,sans-serif">It's used in ovn.</span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Ashish Varma <<a href="mailto:ashishvarma.ovs@gmail.com" target="_blank">ashishvarma.ovs@gmail.com</a>> 于2019年8月21日周三 上午12:46写道:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I have attempted to write a document explaining the Nicira extension which is still a v1 patch for review.<div><br></div><div><a href="https://patchwork.ozlabs.org/patch/1145870/" target="_blank">https://patchwork.ozlabs.org/patch/1145870/</a><br></div><div><br></div><div>Nicira extensions were added in the early days of OVS during early OpenFlow versions and a lot of those extensions made it to standard OpenFlow specifications.</div><div>packet_in message is supported in OpenFlow 1.3. Any specific reason to use nxm_packet_in_2?</div><div><br></div><div>Below is an example of OpenFlow 1.0 Nicira Vendor message 'Flow Mod' with 'NXM' or Nicira Extensible Match fields generated using:</div><div>ovs-ofctl add-flow br1 "table=10, priority=100, cookie=0x0102030405060708 ip, sctp, sctp_dst=9, actions=drop"<br></div><div><br></div><div>This is an example to show how NXM is encoded.</div><div><br></div><div>OVS NXM fields are described at </div><div><a href="http://www.openvswitch.org/support/dist-docs/ovs-fields.7.txt" target="_blank">http://www.openvswitch.org/support/dist-docs/ovs-fields.7.txt</a></div><div><br></div><div><font face="courier new, monospace">0x01 0x04 0x00 0x48 0x00 0x00 0x00 0x0a<br>0x00 0x00 0x23 0x20 0x00 0x00 0x00 0x0d<br>0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08<br>0x0a 0x00 0x00 0x00 0x00 0x00 0x00 0x64<br>0xff 0xff 0xff 0xff 0xff 0xff 0x00 0x00<br>0x00 0x11 0x00 0x00 0x00 0x00 0x00 0x00<br>0x00 0x00 0x06 0x02 0x08 0x00 0x00 0x00<br>0x0c 0x01 0x84 0x80 0x00 0x24 0x02 0x00<br>0x09 0x00 0x00 0x00 0x00 0x00 0x00 0x00<br><br><br>// ofp_header with Version=1, Message Type=4 (Vendor)<br>0x01 0x04 0x00 0x48 0x00 0x00 0x00 0x0a<br><br>// Vendor id = 0x00002320 Subtype = 0x00 0x0d (Where are these defined ??)<br>0x00 0x00 0x23 0x20 0x00 0x00 0x00 0x0d<br><br>// Cookie<br>0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08<br><br>// Command = 0x0a 0x00 (table-id=0x0a,command=add(0x00)) idle_time = 0 hard_time = 0 priority = 100<br>0x0a 0x00 0x00 0x00 0x00 0x00 0x00 0x64<br><br>// buffer_id = 0xffffffff out_port = OFPP_NONE(0xffff) flags = 0<br>0xff 0xff 0xff 0xff 0xff 0xff 0x00 0x00<br><br>// match_len = 0x11 padding= 0x000000000000<br>0x00 0x11 0x00 0x00 0x00 0x00 0x00 0x00<br><br>// OFPXMC12_NXM_0 (nxm_vendor 0x0000) nxm_field+hm=0x06,nxm_field=0x03,hm=0 nxm_length=0x02 value=0x0800 (ethernet)<br>0x00 0x00 0x06 0x02 0x08 0x00<br><br>// OFPXMC12_NXM_0 (nxm_vendor 0x0000) nxm_field+hm=0x0c,nxm_field=0x06,hm=0 nxm_length=0x01 value=0x84 (sctp)<br>0x00 0x00 0x0c 0x01 0x84<br><br>// OFPXMC_OPENFLOW_BASIC (0x8000) nxm_field+hm=0x24,nxm_field=0x12,hm=0 nxm_length=0x02 value=0x09 (sctp_dst_port)<br>0x80 0x00 0x24 0x02 0x00 0x09<br><br>// padding 7 bytes of 0s<br>0x00 0x00 0x00 0x00 0x00 0x00 0x00<br></font></div><div><font face="courier new, monospace"><br></font></div><div><br></div><div><br></div><div>Thanks,</div><div>Ashish</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 20, 2019 at 3:45 AM kai xi fan <<a href="mailto:kaixi.f@gmail.com" target="_blank">kaixi.f@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Thanks.</div><div class="gmail_default" style="font-family:verdana,sans-serif">I have read the following file.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><a href="https://github.com/openvswitch/ovs/blob/master/include/openflow/nicira-ext.h" style="font-family:Arial,Helvetica,sans-serif" target="_blank">https://github.com/openvswitch/ovs/blob/master/include/openflow/<span class="gmail-m_4907846401497782793gmail-m_-8427598025717144450gmail-m_-1979964944260726479gmail-m_-2400348285952197317gmail-il">nicira</span>-ext.h</a> </div><div class="gmail_default" style="font-family:verdana,sans-serif">But it's too simple to understand. For example, nicira extension use properties in <span style="color:rgb(80,0,80)">"nxm packet_in_2" packet in format. But there is no such openflow message format in detail.</span><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><span style="color:rgb(80,0,80)">I have to tcpdump the openflow packet to understand it.</span></div><div class="gmail_default" style="font-family:verdana,sans-serif"><span style="color:rgb(80,0,80)">May be there is a official document about this ?</span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Numan Siddique <<a href="mailto:nusiddiq@redhat.com" target="_blank">nusiddiq@redhat.com</a>> 于2019年8月20日周二 下午3:37写道:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 20, 2019 at 7:35 AM kai xi fan <<a href="mailto:kaixi.f@gmail.com" target="_blank">kaixi.f@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><font face="verdana, sans-serif">I am writing a controller to control ovs through openflow protocol. </font></div><div><font face="verdana, sans-serif">I found that when I dump flows from ovs using ovs-ofctl. </font><span style="font-family:verdana,sans-serif">It shows me so many fields prefixed with "NXM". </span></div><div><font face="verdana, sans-serif">And we plan to use "nxm packet_in_2" format. It also needs nicira extensions.</font></div><div><font face="verdana, sans-serif">So if the controller wants to communicate with ovs using openflow 1.3, I have to deal with nicira extensions.</font></div><div><font face="verdana, sans-serif">But I could not found any document about its format and the corresponding openflow message format.</font></div><div><font face="verdana, sans-serif">Could any one help me ?</font></div></div></blockquote><div><br></div><div>I think you can find useful information here - <a href="https://github.com/openvswitch/ovs/blob/master/include/openflow/nicira-ext.h" target="_blank">https://github.com/openvswitch/ovs/blob/master/include/openflow/nicira-ext.h</a></div><div><br></div><div>Thanks</div><div>Numan</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><font face="verdana, sans-serif">thanks.</font></div></div>
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