From 5314d83193be465afd747659ed72d24ed2f6aeab Mon Sep 17 00:00:00 2001
From: Coiby Xu <coxu@redhat.com>
Date: Fri, 2 Feb 2024 14:24:25 +0800
Subject: [PATCH] dracut-module-setup.sh: also install the driver of physical
 NIC for Hyper-V VM with accelerated networking

Resolves: https://issues.redhat.com/browse/RHEL-23831
Upstream: Fedora
Conflict: None

commit bc101086e2c32594c8e01b50f0353f50d71f87f5
Author: Coiby Xu <coxu@redhat.com>
Date:   Mon Dec 12 18:37:25 2022 +0800

    dracut-module-setup.sh: also install the driver of physical NIC for
    Hyper-V VM with accelerated networking

    Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2151842

    Currently, vmcore dumping to remote fs fails on Azure Hyper-V VM with
    accelerated networking because it uses a physical NIC for accrelarated
    networking [1]. In this case, the driver for this physical NIC should be
    installed as well.

    [1] https://learn.microsoft.com/en-us/azure/virtual-network/accelerated-networking-overview

    Fixes: a65dde2d ("Reduce kdump memory consumption by only installing needed NIC drivers")

    Reported-by: Xiaoqiang Xiong <xxiong@redhat.com>
    Signed-off-by: Coiby Xu <coxu@redhat.com>
    Reviewed-by: Philipp Rudo <prudo@redhat.com>

Signed-off-by: Coiby Xu <coxu@redhat.com>
---
 dracut-module-setup.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 1fa3011..19066ea 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -363,6 +363,14 @@ _get_nic_driver() {
     ethtool -i "$1" | sed -n -E "s/driver: (.*)/\1/p"
 }
 
+_get_hpyerv_physical_driver() {
+    local _physical_nic
+
+    _physical_nic=$(find /sys/class/net/"$1"/ -name 'lower_*' | sed -En "s/\/.*lower_(.*)/\1/p")
+    [[ -n $_physical_nic ]] || return
+    _get_nic_driver "$_physical_nic"
+}
+
 kdump_install_nic_driver() {
     local _netif _driver _drivers
 
@@ -382,6 +390,11 @@ kdump_install_nic_driver() {
         elif [[ $_driver == "team" ]]; then
             # install the team mode drivers like team_mode_roundrobin.ko as well
             _driver='=drivers/net/team'
+        elif [[ $_driver == "hv_netvsc" ]]; then
+            # A Hyper-V VM may have accelerated networking
+            # https://learn.microsoft.com/en-us/azure/virtual-network/accelerated-networking-overview
+            # Install the driver of physical NIC as well
+            _drivers+=("$(_get_hpyerv_physical_driver "$_netif")")
         fi
 
         _drivers+=("$_driver")