From 76ec341c5efbeb0c47ec28c518820c1b4beac2fa Mon Sep 17 00:00:00 2001
From: Kairui Song <kasong@redhat.com>
Date: Thu, 5 Mar 2020 18:44:45 +0800
Subject: [PATCH] 95znet: Add a rd.znet_ifname= option
qeth device may have a different IP for each boot, so the rd.ifname=
option will no longer work. So for znet device, introduce a
rd.znet_ifname= options, to subchannel id instead of MAC address as the
identifier and rename the interface.
Signed-off-by: Kairui Song <kasong@redhat.com>
---
dracut.cmdline.7.asc | 5 +++++
modules.d/95znet/parse-ccw.sh | 18 ++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/dracut.cmdline.7.asc b/dracut.cmdline.7.asc
index 1204aeb2..3c70c82d 100644
--- a/dracut.cmdline.7.asc
+++ b/dracut.cmdline.7.asc
@@ -762,6 +762,11 @@ ZNET
~~~~
**rd.znet=**__<nettype>__,__<subchannels>__,__<options>__::
rd.znet can be specified multiple times on the kernel command line.
+
+**rd.znet_ifname=**__<ifname>__:__<subchannels>__::
+ Assign network device name <interface> (i.e. "bootnet") to the NIC
+ corresponds to the subchannels. This is useful when dracut's default
+ "ifname=" doesn't work due to device having a changing MAC address.
+
[listing]
.Example
diff --git a/modules.d/95znet/parse-ccw.sh b/modules.d/95znet/parse-ccw.sh
index cf1f41d4..c8085eda 100755
--- a/modules.d/95znet/parse-ccw.sh
+++ b/modules.d/95znet/parse-ccw.sh
@@ -6,4 +6,22 @@ for ccw_arg in $(getargs rd.ccw -d 'rd_CCW=') $(getargs rd.znet -d 'rd_ZNET=');
echo $ccw_arg >> /etc/ccw.conf
done
+for ifname in $(getargs rd.znet_ifname); do
+ IFS=: read ifname_if ifname_subchannels _rest <<< "$ifname"
+ if [ -z "$ifname_if" ] || [ -z "$ifname_subchannels" ] || [ -n "$_rest" ]; then
+ warn "Invalid arguments for rd.znet_ifname="
+ else
+ {
+ ifname_subchannels=${ifname_subchannels//,/|}
+
+ echo 'ACTION!="add|change", GOTO="ccw_ifname_end"'
+ echo 'ATTR{type}!="1", GOTO="ccw_ifname_end"'
+ echo 'SUBSYSTEM!="net", GOTO="ccw_ifname_end"'
+ echo "SUBSYSTEMS==\"ccwgroup\", KERNELS==\"$ifname_subchannels\", DRIVERS==\"?*\" NAME=\"$ifname_if\""
+ echo 'LABEL="ccw_ifname_end"'
+
+ } > /etc/udev/rules.d/81-ccw-ifname.rules
+ fi
+done
+
znet_cio_free