test: add interleave set compatibility test

Per the realization that Linux was incompatible with other
implementations of the interleave-set-cookie algorithm [1], add a
regression test to check for compatibility with the original Linux
implementation.

This also serves as a unit test for the new 'write-labels' command.

[1]: commit 86ef58a4e35e ("nfit, libnvdimm: fix interleave set cookie calculation")

Reported-by: Nicholas Moulin <[email protected]>
Signed-off-by: Dan Williams <[email protected]>

Author: djbw

test/Makefile.am

@@ -10,7 +10,8 @@ TESTS =\
 	clear.sh \
 	dax-errors.sh \
 	daxdev-errors.sh \
-	btt-check.sh
+	btt-check.sh \
+	label-compat.sh
 
 check_PROGRAMS =\
 	libndctl \

test/label-compat.sh

@@ -0,0 +1,61 @@
+#!/bin/bash -x
+NDCTL="../ndctl/ndctl"
+BUS="-b nfit_test.0"
+BUS1="-b nfit_test.1"
+rc=77
+
+set -e
+
+err() {
+	echo "test/label-compat.sh: failed at line $1"
+	exit $rc
+}
+
+check_min_kver()
+{
+	local ver="$1"
+	: "${KVER:=$(uname -r)}"
+
+	[ -n "$ver" ] || return 1
+	[[ "$ver" == "$(echo -e "$ver\n$KVER" | sort -V | head -1)" ]]
+}
+
+check_min_kver "4.11" || { echo "kernel $KVER may not provide reliable isetcookie values"; exit $rc; }
+
+set -e
+trap 'err $LINENO' ERR
+
+# setup (reset nfit_test dimms)
+modprobe nfit_test
+$NDCTL disable-region $BUS all
+$NDCTL zero-labels $BUS all
+
+# grab the largest pmem region on $BUS
+query=". | sort_by(.available_size) | reverse | .[0].dev"
+region=$($NDCTL list $BUS -t pmem -Ri | jq -r "$query")
+
+# we assume that $region is comprised of 4 dimms
+query=". | .regions[0].mappings | sort_by(.dimm) | .[].dimm"
+dimms=$($NDCTL list -DRi -r $region | jq -r "$query" | xargs)
+i=1
+for d in $dimms
+do
+	$NDCTL write-labels $d -i nmem${i}.bin
+	i=$((i+1))
+done
+
+$NDCTL enable-region $BUS all
+
+len=$($NDCTL list -r 7 -N | jq -r "length")
+
+if [ -z $len ]; then
+	rc=1
+	echo "failed to find legacy isetcookie namespace"
+	exit 1
+fi
+
+$NDCTL disable-region $BUS all
+$NDCTL disable-region $BUS1 all
+modprobe -r nfit_test
+
+exit 0