nvmf-autoconnect: add NetworkManager dispatcher script

If an interface is brought up that is configured in the NVMeoF
Boot Firmware Table (NBFT), we need to establish possibly missing
NVMe connections from the NBFT. This can happen if an interface couldn't be
brought up during initramfs processing, but is activated later on.

Add a NM-dispatcher script that takes care of the connection attempt.

Signed-off-by: Martin Wilck <mwilck@suse.com>

Author: mwilck

meson.build

@@ -103,6 +103,7 @@ sysconfdir     = join_paths(prefixdir, get_option('sysconfdir'))
 udevrulesdir   = join_paths(prefixdir, get_option('udevrulesdir'))
 dracutrulesdir = join_paths(prefixdir, get_option('dracutrulesdir'))
 systemddir     = join_paths(prefixdir, get_option('systemddir'))
+nmdispatchdir  = join_paths(prefixdir, get_option('nmdispatchdir'))
 rundir         = join_paths(prefixdir, get_option('rundir'))
 
 std_prefix = prefixdir == '/usr' or prefixdir == '/usr/local'
@@ -571,6 +572,21 @@ if want_nvme
         )
     endforeach
 
+    nm_dispatcher_files = [
+        '80-nvmf-connect-nbft.sh'
+    ]
+
+    foreach file : nm_dispatcher_files
+        configure_file(
+            input: 'nvmf-autoconnect/nm-dispatcher/' + file + '.in',
+            output: file,
+            configuration: substs,
+            install: true,
+            install_mode: 'rwxr-xr-x',
+            install_dir: nmdispatchdir
+        )
+    endforeach
+
     install_data(
         'completions/bash-nvme-completion.sh',
         rename: 'nvme',
@@ -596,6 +612,7 @@ path_dict = {
     'dracutrulesdir':   dracutrulesdir,
     'rundir':           rundir,
     'systemddir':       systemddir,
+    'nmdispatchdir':    nmdispatchdir,
     'build location':   meson.current_build_dir(),
 }
 summary(path_dict, section: 'Paths')

meson_options.txt

@@ -95,6 +95,12 @@ option(
   value : 'lib/udev/rules.d',
   description : 'directory for udev rules files'
 )
+option(
+  'nmdispatchdir',
+  type : 'string',
+  value : 'lib/NetworkManager/dispatcher.d',
+  description : 'directory for NetworkManager dispatcher scripts'
+)
 option(
   'version-tag',
   type : 'string',

nvmf-autoconnect/nm-dispatcher/80-nvmf-connect-nbft.sh.in

@@ -0,0 +1,26 @@
+#! /bin/sh
+
+# If an interface is brought up that is configured in the NVMeoF
+# Boot Firmware Table (NBFT), try to establish possibly missing
+# NVMe connections from the NBFT.
+# This can happen if an interface couldn't be brought up during
+# initramfs processing, but is activated later on.
+
+start_nvmf=
+
+if [ "$2" = up ]; then
+    case $1 in
+	nbft*)
+	    start_nvmf=yes
+	    ;;
+    esac
+    case $CONNECTION_ID in
+        "NBFT connection HFI"*)
+	    start_nvmf=yes
+            ;;
+    esac
+fi
+
+if [ "$start_nvmf" ]; then
+    @SYSTEMCTL@ --no-block start nvmf-connect-nbft.service || true
+fi