systemd: enable mac based names in NamePolicy

Some BSPs only provide information to construct a
predictable network interface named based on a mac
address, so we enable that NamePolicy option.

This policy has been adopted for sysvinit as of
commit 4a7b42fcf6981d3120c08091a7ed3d4d7bcd41f0.

(From OE-Core rev: 37bd8e8dddce9d0b5bfbcf9244225c3b853d7077)

Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 34 insertions, 0 deletions

diff --git a/meta/recipes-core/systemd/systemd/0001-NamePolicy.patch b/meta/recipes-core/systemd/systemd/0001-NamePolicy.patch
new file mode 100644
index 0000000000..46955cbcbb
--- /dev/null
+++ b/meta/recipes-core/systemd/systemd/0001-NamePolicy.patch
@@ -0,0 +1,33 @@
+From 9bb09886320eb286108fb370b2634a66b3e3b9ff Mon Sep 17 00:00:00 2001
+From: Joe Slater <joe.slater@windriver.com>
+Date: Thu, 21 Mar 2024 16:28:31 +0000
+Subject: [PATCH] systemd: enable mac based names in NamePolicy
+
+The default NamePolicy for network interface names does not
+include names based on mac addresses.  Some BSPs, though, do
+not provide information to compute other names, so we enable
+mac names as a last resort.
+
+Upstream-Status: Inappropriate [enable feature]
+
+Signed-off-by: Joe Slater <joe.slater@windriver.com>
+---
+ network/99-default.link | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/network/99-default.link b/network/99-default.link
+index 429ac31e80..543ce54661 100644
+--- a/network/99-default.link
++++ b/network/99-default.link
+@@ -15,6 +15,6 @@
+ OriginalName=*
+ 
+ [Link]
+-NamePolicy=keep kernel database onboard slot path
+-AlternativeNamesPolicy=database onboard slot path
++NamePolicy=keep kernel database onboard slot path mac
++AlternativeNamesPolicy=database onboard slot path mac
+ MACAddressPolicy=persistent
+-- 
+2.35.5
+
diff --git a/meta/recipes-core/systemd/systemd_255.4.bb b/meta/recipes-core/systemd/systemd_255.4.bb
index bcef3e6b7a..b02e44d9c0 100644
--- a/meta/recipes-core/systemd/systemd_255.4.bb
+++ b/meta/recipes-core/systemd/systemd_255.4.bb
@@ -28,6 +28,7 @@ SRC_URI += " \
            file://systemd-pager.sh \
            file://0002-binfmt-Don-t-install-dependency-links-at-install-tim.patch \
            file://0008-implment-systemd-sysv-install-for-OE.patch \
+           file://0001-NamePolicy.patch \
            "
 
 # patches needed by musl