File kdump-net-0002-iface-kind.patch of Package kdump

From: Petr Tesarik <ptesarik@suse.com>
Date: Fri, 19 Aug 2016 18:50:04 +0200
Subject: Add initrd options according to interface kind
References: bsc#980328
Patch-mainline: v0.8.16
Git-commit: 25426224ccd2801446d050b0487eab3f29847b24

Query the interface kind (kdump_ifkind) and handle known kinds in
a case statement. Unhandled kinds return an error, so the caller
can check whether the interface was handled or not. This allows to
filter out unwanted interfaces (such as tunnel devices).

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 init/setup-kdump.functions |  100 ++++++++++++++++++++++++++++-----------------
 1 file changed, 64 insertions(+), 36 deletions(-)

--- a/init/setup-kdump.functions
+++ b/init/setup-kdump.functions
@@ -108,34 +108,6 @@ function kdump_default_netdev()
     echo "$ifname"
 }									   # }}}
 
-# Get the underlying physical devices of a bridge.
-#
-# Virtual devices (tap or vif) are ignored.
-#
-# Parameters:
-#   1) ifname  bridge interface name
-# Output:
-#   ifnames  list of underlying physical interfaces;
-function kdump_bridge_phys_dev()					   # {{{
-{
-    local ifname="$1"
-
-    [ -d "/sys/class/net/$ifname/bridge" -a \
-      -d "/sys/class/net/$ifname/brif" ] || return 1
-
-    local ifname2 count=0
-    local -a res
-    for ifname2 in "/sys/class/net/$ifname/brif"/*; do
-        case "$(readlink -f "$ifname2")" in
-        /sys/devices/virtual/*)
-            continue
-        esac
-        res[count]="${ifname2##*/}"
-        count=$(( count+1 ))
-    done
-    echo "${res[@]}"
-}									   # }}}
-
 #
 # Determine the default network mode of a given device.
 #
@@ -190,6 +162,58 @@ function kdump_netdev_mode()						   # {
 }									   # }}}
 
 #
+# Get the interface kind
+#
+# Parameters:
+#   1) iface  device name
+# Output:
+#   interface kind (IFLA_INFO_KIND)
+function kdump_ifkind()							   # {{{
+{
+    ip -d link show "$1" | sed -n '3{s/^ *\([^ ]*\).*/\1/;s/.*_slave$//;p}'
+}									   # }}}
+
+#
+# Get a list of slave interfaces
+#
+# Parameters:
+#   1) iface  master device name
+# Output:
+#   list of slave interfaces
+function kdump_list_slaves()						   # {{{
+{
+    local syspath="/sys/class/net/$1/lower_"
+    local lower=$(echo ${syspath}*)
+    local if
+    for if in $lower
+    do
+	echo -n " ${if#$syspath}"
+    done
+}									   # }}}
+
+#
+# Get the bridge configuration options
+#
+# Parameters:
+#   1) iface  device name
+# Output:
+#   corresponding bridge= initrd parameter and dependencies
+function kdump_bridge_config()						   # {{{
+{
+    local iface="$1"
+    local if slaves
+
+    for if in $(kdump_list_slaves "$iface")
+    do
+	kdump_ifname_config "$if" || continue
+	slaves="$slaves $if"
+    done
+    [ -n "$slaves" ] || return 1
+
+    slaves="${slaves# }"
+    echo -n " bridge=$iface:${slaves// /,}"
+}									   # }}}
+
 # Get the ifname parameter for a given device
 #
 # Parameters:
@@ -199,17 +223,21 @@ function kdump_netdev_mode()						   # {
 function kdump_ifname_config()						   # {{{
 {
     local iface="$1"
+    local ifkind=$(kdump_ifkind "$iface")
 
-    local phys
-    if phys=$(kdump_bridge_phys_dev "$iface") ; then
-	echo -n " bridge=$iface:${phys// */,}"
-	for iface in ${phys}
-	do
-	    kdump_ifname_config "$iface"
-	done
-    else
+    if [ -z "$ifkind" ]
+    then
 	local hwaddr=$(<"/sys/class/net/$iface/address")
 	[ -n "$hwaddr" ] && echo -n " ifname=$iface:$hwaddr"
+    else
+	case "$ifkind" in
+	    bridge)
+		kdump_bridge_config "$iface"
+		;;
+	    *)
+		return 1
+		;;
+	esac
     fi
 }									   # }}}