fix(nvmf): autoconnect logic for nvme-cli 2.5 and newer

In nvme-cli 2.5, the "nvme connect-nbft" functionality has been
included in the "nvme connect-all" command. "connect-all" will now
try  connecting to NBFT targets, too, unless the --no-nbft option
is used. "connect-all --nbft" will attempt connecting to NBFT targets
only.

Preserve the previous priority logic for the 2.5+ command line syntax.
The "timeout" case is simplified, it just attempts a "connect-all" and
an FC autoconnect. For the regular connect attempts, the priorities
remain as before:

 1 FC autoconnect from kernel commandline ("rd.nvmf.discover=fc,auto")
 2 NBFT
 3 discovery.conf / config.json / hostonly parameters determined at
   initramfs build time
 4 FC autoconnect without kernel command line

Note that NBFT settings take precedence over explicit command line settings.
To enforce use of (only) kernel command line settings for NVMe-oF, use this:

   rd.nvmf.nostatic rd.nvmf.nonbft rd.nvmf.discover=...

Because nvme-cli 2.5 is not released yet and older versions will be around for
some time, check whether the nbft-related options are supported, and fall
back to plain "connect-all" if not (this will not connect to NBFT targets).

modules.d/95nvmf/nvmf-autoconnect.sh

@@ -6,25 +6,45 @@
 
 [ "$RD_DEBUG" != yes ] || set -x
 
+if [ "$1" = timeout ]; then
+    [ ! -f /sys/class/fc/fc_udev_device/nvme_discovery ] \
+        || echo add > /sys/class/fc/fc_udev_device/nvme_discovery
+    /usr/sbin/nvme connect-all
+    exit 0
+fi
+
 NVMF_HOSTNQN_OK=
 [ ! -f "/etc/nvme/hostnqn" ] || [ ! -f "/etc/nvme/hostid" ] || NVMF_HOSTNQN_OK=1
 
+# Only nvme-cli 2.5 or newer supports the options --nbft and --no-nbft
+# for the connect-all command.
+# Make sure we don't use unsupported options with earlier versions.
+NBFT_SUPPORTED=
+# shellcheck disable=SC2016
+/usr/sbin/nvme connect-all --help 2>&1 | sed -n '/[[:space:]]--nbft[[:space:]]/q1;$q0' \
+    || NBFT_SUPPORTED=1
+
 if [ -e /tmp/nvmf-fc-auto ] && [ "$NVMF_HOSTNQN_OK" ] \
     && [ -f /sys/class/fc/fc_udev_device/nvme_discovery ]; then
     # prio 1: cmdline override "rd.nvmf.discovery=fc,auto"
     echo add > /sys/class/fc/fc_udev_device/nvme_discovery
-    [ "$1" = timeout ] || exit 0
+    exit 0
 fi
-if [ -e /tmp/valid_nbft_entry_found ]; then
+if [ "$NBFT_SUPPORTED" ] && [ -e /tmp/valid_nbft_entry_found ]; then
     # prio 2: NBFT
-    /usr/sbin/nvme connect-all
-    [ "$1" = timeout ] || exit 0
+    /usr/sbin/nvme connect-all --nbft
+    exit 0
 fi
 if [ -f /etc/nvme/discovery.conf ] || [ -f /etc/nvme/config.json ] \
     && [ "$NVMF_HOSTNQN_OK" ]; then
-    # prio 3: discovery.conf from initrd
-    /usr/sbin/nvme connect-all
-    [ "$1" = timeout ] || exit 0
+    # prio 3: configuration from initrd and/or kernel command line
+    # We can get here even if "rd.nvmf.nonbft" was given, thus use --no-nbft
+    if [ "$NBFT_SUPPORTED" ]; then
+        /usr/sbin/nvme connect-all --no-nbft
+    else
+        /usr/sbin/nvme connect-all
+    fi
+    exit 0
 fi
 if [ "$NVMF_HOSTNQN_OK" ] \
     && [ -f /sys/class/fc/fc_udev_device/nvme_discovery ]; then