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<p class="MsoNormal"><span style="font-size:11.0pt">Query regarding phosphor-networkd:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">With the openbmc version 2.18, I have written a custom software module that registers a callback to monitor the Dbus interface signals: “InterfacesAdded” and “InterfacesRemoved” from the phosphor-networkd.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I tried switching my ethernet interface eth0 on AST2600 SoC from DHCP to Static IP.
<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I could assign static IP successfully to eth0 interface and DHCP IP resource is released. But, I have several observations:<o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">I see “InterfaceAdded” Dbus signal emitted
<b>first</b> from the phosphor-network for DHCP->Static transition. I believe it represents a creation of a dbus static IP object, interface, and properties.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">Followed with it, “InterfaceRemoved” signal is emitted from the phosphor-network that deletes existing DHCP IP object.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1"><span style="font-size:11.0pt">In the signal callback handlers, I have a custom implementation that consists of a mutex lock for my database that is acquired when the “InterfaceRemoved”
signal is received and same lock is released when “InterfaceAdded” signal is received. Additionally, I did several database updates based on the signal received.<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Now, I see an issue where this database lock is always acquired after DHCP->Static transition. Additionally, some of the database properties are corrupted. After root cause analysis for both the issues, i
concluded that it is due to the order of the signals mentioned in point 1 and 2. Consistently, I see a similar order of the signals from phosphor-network i.e. “InterfacAdded” first followed by "InterfaceRemoved”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I want to understand if there is a mechanism to control this order of the “InterfaceAdded” and “InterfaceRemoved” signals from phosphor-network to achieve consistent behavior align to my expectations. My expectation
in this case is “IntefaceRemoved” shall always be emitted first and then “InterfaceAdded”.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Pankaj Patil<o:p></o:p></span></p>
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