95iscsi: Autodetect iSCSI firmware

Some iSCSI initiator present firmware information in
/sys/firmware/ibft or /sys/firmware/iscsi_bootX

Whenever we detect one of those directories we should assume
that the iSCSI devices should be activated.

Also incorporates SUSE patches:
0049:
95iscsi: Use 'ip=ibft' for ibft autoconfiguration

For iBFT autoconfiguration we should be setting 'ip=ibft'
instead of rd.neednet. This should instruct dracut to only
enable the iBFT interfaces and leave the rest alone.

References: bnc#879038

0054:
95iscsi: update commandline printing

dracut has a separate callout 'cmdline' which should be used
for printing out the generated commandline.

Signed-off-by: Pavel Wieczorkiewicz <pwieczorkiewicz@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Thomas Renninger <trenn@suse.de>

modules.d/95iscsi/module-setup.sh

@@ -28,6 +28,21 @@ check() {
     return 0
 }
 
+install_ibft() {
+    # When iBFT / iscsi_boot is detected:
+    # - Use 'ip=ibft' to set up iBFT network interface
+    # - specify firmware booting cmdline parameter
+
+    for d in /sys/firmware/* ; do
+        if [ -d ${d}/initiator ] ; then
+            if [ ${d##*/} = "ibft" ] ; then
+                echo -n "ip=ibft "
+            fi
+            echo -n "rd.iscsi.firmware=1"
+        fi
+    done
+}
+
 # called by dracut
 depends() {
     echo network rootfs-block
@@ -37,6 +52,12 @@ depends() {
 installkernel() {
     local _arch=$(uname -m)
 
+    # Detect iBFT and perform mandatory steps
+    if [[ $hostonly_cmdline == "yes" ]] ; then
+        install_ibft > "${initdir}/etc/cmdline.d/95iscsi.conf"
+        echo >> "${initdir}/etc/cmdline.d/95iscsi.conf"
+    fi
+
     instmods bnx2i qla4xxx cxgb3i cxgb4i be2iscsi
     hostonly="" instmods iscsi_tcp iscsi_ibft crc32c iscsi_boot_sysfs
     iscsi_module_filter() {
@@ -76,6 +97,11 @@ installkernel() {
     | iscsi_module_filter  |  instmods
 }
 
+# called by dracut
+cmdline() {
+    install_ibft
+}
+
 # called by dracut
 install() {
     inst_multiple umount iscsistart hostname iscsi-iname