selftests: mptcp: add more arguments for chk_join_nr

This patch added five more arguments for chk_join_nr(). The default
values of them are all zero.

The first two, csum_ns1 and csum_ns1, are passed to chk_csum_nr(), to
check the mib counters of the checksum errors in ns1 and ns2. A '+'
can be added into this two arguments to represent that multiple
checksum errors are allowed when doing this check. For example,

        chk_csum_nr "" +2 +2

indicates that two or more checksum errors are allowed in both ns1 and
ns2.

The remaining two, fail_nr and rst_nr, are passed to chk_fail_nr() and
chk_rst_nr() respectively, to check the sending and receiving mib
counters of MP_FAIL and MP_RST.

Also did some cleanups in chk_fail_nr(), renamed two local variables
and updated the output message.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/mptcp/mptcp_join.sh

@@ -766,8 +766,21 @@ dump_stats()
 chk_csum_nr()
 {
 	local msg=${1:-""}
+	local csum_ns1=${2:-0}
+	local csum_ns2=${3:-0}
 	local count
 	local dump_stats
+	local allow_multi_errors_ns1=0
+	local allow_multi_errors_ns2=0
+
+	if [[ "${csum_ns1}" = "+"* ]]; then
+		allow_multi_errors_ns1=1
+		csum_ns1=${csum_ns1:1}
+	fi
+	if [[ "${csum_ns2}" = "+"* ]]; then
+		allow_multi_errors_ns2=1
+		csum_ns2=${csum_ns2:1}
+	fi
 
 	if [ ! -z "$msg" ]; then
 		printf "%03u" "$TEST_COUNT"
@@ -777,8 +790,9 @@ chk_csum_nr()
 	printf " %-36s %s" "$msg" "sum"
 	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}'`
 	[ -z "$count" ] && count=0
-	if [ "$count" != 0 ]; then
-		echo "[fail] got $count data checksum error[s] expected 0"
+	if [ "$count" != $csum_ns1 -a $allow_multi_errors_ns1 -eq 0 ] ||
+	   [ "$count" -lt $csum_ns1 -a $allow_multi_errors_ns1 -eq 1 ]; then
+		echo "[fail] got $count data checksum error[s] expected $csum_ns1"
 		ret=1
 		dump_stats=1
 	else
@@ -787,8 +801,9 @@ chk_csum_nr()
 	echo -n " - csum  "
 	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}'`
 	[ -z "$count" ] && count=0
-	if [ "$count" != 0 ]; then
-		echo "[fail] got $count data checksum error[s] expected 0"
+	if [ "$count" != $csum_ns2 -a $allow_multi_errors_ns2 -eq 0 ] ||
+	   [ "$count" -lt $csum_ns2 -a $allow_multi_errors_ns2 -eq 1 ]; then
+		echo "[fail] got $count data checksum error[s] expected $csum_ns2"
 		ret=1
 		dump_stats=1
 	else
@@ -799,27 +814,27 @@ chk_csum_nr()
 
 chk_fail_nr()
 {
-	local mp_fail_nr_tx=$1
-	local mp_fail_nr_rx=$2
+	local fail_tx=$1
+	local fail_rx=$2
 	local count
 	local dump_stats
 
 	printf "%-${nr_blank}s %s" " " "ftx"
 	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPFailTx | awk '{print $2}'`
 	[ -z "$count" ] && count=0
-	if [ "$count" != "$mp_fail_nr_tx" ]; then
-		echo "[fail] got $count MP_FAIL[s] TX expected $mp_fail_nr_tx"
+	if [ "$count" != "$fail_tx" ]; then
+		echo "[fail] got $count MP_FAIL[s] TX expected $fail_tx"
 		ret=1
 		dump_stats=1
 	else
 		echo -n "[ ok ]"
 	fi
 
-	echo -n " - frx   "
+	echo -n " - failrx"
 	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPFailRx | awk '{print $2}'`
 	[ -z "$count" ] && count=0
-	if [ "$count" != "$mp_fail_nr_rx" ]; then
-		echo "[fail] got $count MP_FAIL[s] RX expected $mp_fail_nr_rx"
+	if [ "$count" != "$fail_rx" ]; then
+		echo "[fail] got $count MP_FAIL[s] RX expected $fail_rx"
 		ret=1
 		dump_stats=1
 	else
@@ -911,6 +926,10 @@ chk_join_nr()
 	local syn_nr=$2
 	local syn_ack_nr=$3
 	local ack_nr=$4
+	local csum_ns1=${5:-0}
+	local csum_ns2=${6:-0}
+	local fail_nr=${7:-0}
+	local rst_nr=${8:-0}
 	local count
 	local dump_stats
 	local with_cookie
@@ -957,9 +976,9 @@ chk_join_nr()
 	fi
 	[ "${dump_stats}" = 1 ] && dump_stats
 	if [ $checksum -eq 1 ]; then
-		chk_csum_nr
-		chk_fail_nr 0 0
-		chk_rst_nr 0 0
+		chk_csum_nr "" $csum_ns1 $csum_ns2
+		chk_fail_nr $fail_nr $fail_nr
+		chk_rst_nr $rst_nr $rst_nr
 	fi
 }