meta-ampere: network: workaround: avoid high dbus traffic

During the DC power cycle, if an interface is lost and re-gained
(especially an inband interface, like usb0), phosphor-network will jump
to the method "createChildObjects()" to create  these two object paths
"/xyz/openbmc_project/network/config and
/xyz/openbmc_project/network/config/dhcp" and it will keep recursively
triggering the org.freedesktop.hostname1 service to query for hostname.
This leads to the dbus become busy and will affect other services like
ipmid which also query for data during DC power cycle.

This commit adds a workaround for this issue, derived from below commits
currently reviewed
https://gerrit.openbmc.org/c/openbmc/phosphor-networkd/+/58755
https://gerrit.openbmc.org/c/openbmc/phosphor-networkd/+/58725

Tested:
1. Run stress DC power cycle 100 times and do not see ssif interface
   issue.

Signed-off-by: quang.name <[email protected]>

meta-ampere/meta-common/recipes-phosphor/network/phosphor-network/0001_avoid_hostnamed_is_triggered.patch

@@ -0,0 +1,28 @@
+diff --git a/src/network_manager.cpp b/src/network_manager.cpp
+index 86d892fb..6c627de5 100644
+--- a/src/network_manager.cpp
++++ b/src/network_manager.cpp
+@@ -149,20 +149,9 @@ void Manager::createChildObjects()
+
+     // creates the ethernet interface dbus object.
+     createInterfaces();
+-
+-    systemConf.reset(nullptr);
+-    dhcpConf.reset(nullptr);
+-
+-    fs::path objPath = objectPath;
+-    objPath /= "config";
+-
+-    // create the system conf object.
+-    systemConf = std::make_unique<phosphor::network::SystemConfiguration>(
+-        bus, objPath.string());
+-    // create the dhcp conf object.
+-    objPath /= "dhcp";
+-    dhcpConf = std::make_unique<phosphor::network::dhcp::Configuration>(
+-        bus, objPath.string(), *this);
++    
++    //simply return to prevent hostnamed service is called
++    return;
+ }
+
+ ObjectPath Manager::vlan(IntfName interfaceName, uint32_t id)

meta-ampere/meta-common/recipes-phosphor/network/phosphor-network_%.bbappend

@@ -1 +1,7 @@
 PACKAGECONFIG:append = " nic-ethtool"
+
+FILESEXTRAPATHS:append := "${THISDIR}/${PN}:"
+
+SRC_URI:append = " \
+                  file://0001_avoid_hostnamed_is_triggered.patch \
+                 "