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From 9eb855e073c077966a011146484b9b9596857361 Mon Sep 17 00:00:00 2001
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From: Kairui Song <kasong@redhat.com>
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Date: Thu, 5 Mar 2020 18:44:45 +0800
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Subject: [PATCH] 95znet: Add a rd.znet_ifname= option
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qeth device may have a different IP for each boot, so the rd.ifname=
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option will no longer work. So for znet device, introduce a
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rd.znet_ifname= options, to subchannel id instead of MAC address as the
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identifier and rename the interface.
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Signed-off-by: Kairui Song <kasong@redhat.com>
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(cherry picked from commit 872eb69936bd849eec6d1974dd6569f23a7ad3db)
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Resolves: #1811977
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---
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dracut.cmdline.7.asc | 5 +++++
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modules.d/95znet/parse-ccw.sh | 18 ++++++++++++++++++
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2 files changed, 23 insertions(+)
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diff --git a/dracut.cmdline.7.asc b/dracut.cmdline.7.asc
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index 7f31fbae..4a7c2517 100644
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--- a/dracut.cmdline.7.asc
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+++ b/dracut.cmdline.7.asc
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@@ -829,6 +829,11 @@ ZNET
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RHEL/Fedora with ccw_init, which is called from udev for certain
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devices on z-series.
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rd.znet can be specified multiple times on the kernel command line.
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+
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+**rd.znet_ifname=**__<ifname>__:__<subchannels>__::
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+ Assign network device name <interface> (i.e. "bootnet") to the NIC
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+ corresponds to the subchannels. This is useful when dracut's default
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+ "ifname=" doesn't work due to device having a changing MAC address.
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+
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[listing]
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.Example
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diff --git a/modules.d/95znet/parse-ccw.sh b/modules.d/95znet/parse-ccw.sh
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index 7d40a1aa..59b588f3 100755
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--- a/modules.d/95znet/parse-ccw.sh
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+++ b/modules.d/95znet/parse-ccw.sh
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@@ -4,4 +4,22 @@ for ccw_arg in $(getargs rd.ccw -d 'rd_CCW=') $(getargs rd.znet -d 'rd_ZNET=');
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echo $ccw_arg >> /etc/ccw.conf
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done
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+for ifname in $(getargs rd.znet_ifname); do
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+ IFS=: read ifname_if ifname_subchannels _rest <<< "$ifname"
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+ if [ -z "$ifname_if" ] || [ -z "$ifname_subchannels" ] || [ -n "$_rest" ]; then
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+ warn "Invalid arguments for rd.znet_ifname="
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+ else
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+ {
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+ ifname_subchannels=${ifname_subchannels//,/|}
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+
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+ echo 'ACTION!="add|change", GOTO="ccw_ifname_end"'
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+ echo 'ATTR{type}!="1", GOTO="ccw_ifname_end"'
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+ echo 'SUBSYSTEM!="net", GOTO="ccw_ifname_end"'
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+ echo "SUBSYSTEMS==\"ccwgroup\", KERNELS==\"$ifname_subchannels\", DRIVERS==\"?*\" NAME=\"$ifname_if\""
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+ echo 'LABEL="ccw_ifname_end"'
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+
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+ } > /etc/udev/rules.d/81-ccw-ifname.rules
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+ fi
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+done
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+
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znet_cio_free
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