<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/">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">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">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_-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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