[PATCH v3 3/3] selftests: net: Fix udpgro_frglist.sh shellcheck warnings and errors

[Andrei Gherzan <andrei.gherzan@canonical.com>]

This change fixes the following shellcheck warnings and errors:

* SC2155 (warning): Declare and assign separately to avoid masking return
  values.
* SC2124 (warning): Assigning an array to a string! Assign as array, or use
  instead of @ to concatenate.
* SC2034 (warning): ipv4_args appears unused. Verify use (or export if used
  externally).
* SC2242 (error): Can only exit with status 0-255. Other data should be
  written to stdout/stderr.
* SC2068 (error): Double quote array expansions to avoid re-splitting
  elements.

Fixes: edae34a3ed92 ("selftests net: add UDP GRO fraglist + bpf self-tests")
Signed-off-by: Andrei Gherzan <andrei.gherzan@canonical.com>
---
 tools/testing/selftests/net/udpgro_frglist.sh | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/net/udpgro_frglist.sh b/tools/testing/selftests/net/udpgro_frglist.sh
index e1ca49de2491..97bf20e9afd8 100755
--- a/tools/testing/selftests/net/udpgro_frglist.sh
+++ b/tools/testing/selftests/net/udpgro_frglist.sh
@@ -3,7 +3,8 @@
 #
 # Run a series of udpgro benchmarks
 
-readonly PEER_NS="ns-peer-$(mktemp -u XXXXXX)"
+PEER_NS="ns-peer-$(mktemp -u XXXXXX)"
+readonly PEER_NS
 
 BPF_FILE="../bpf/xdp_dummy.bpf.o"
 BPF_NAT6TO4_FILE="nat6to4.o"
@@ -19,7 +20,7 @@ trap cleanup EXIT
 
 run_one() {
 	# use 'rx' as separator between sender args and receiver args
-	local -r all="$@"
+	local -r all="$*"
 	local -r tx_args=${all%rx*}
 	local rx_args=${all#*rx}
 
@@ -56,13 +57,13 @@ run_one() {
 }
 
 run_in_netns() {
-	local -r args=$@
+	local -r args="$*"
   echo ${args}
 	./in_netns.sh $0 __subprocess ${args}
 }
 
 run_udp() {
-	local -r args=$@
+	local -r args="$*"
 
 	echo "udp gso - over veth touching data"
 	run_in_netns ${args} -u -S 0 rx -4 -v
@@ -72,7 +73,7 @@ run_udp() {
 }
 
 run_tcp() {
-	local -r args=$@
+	local -r args="$*"
 
 	echo "tcp - over veth touching data"
 	run_in_netns ${args} -t rx -4 -t
@@ -80,7 +81,6 @@ run_tcp() {
 
 run_all() {
 	local -r core_args="-l 4"
-	local -r ipv4_args="${core_args} -4  -D 192.168.1.1"
 	local -r ipv6_args="${core_args} -6  -D 2001:db8::1"
 
 	echo "ipv6"
@@ -90,19 +90,19 @@ run_all() {
 
 if [ ! -f ${BPF_FILE} ]; then
 	echo "Missing ${BPF_FILE}. Build bpf selftest first"
-	exit -1
+	exit 1
 fi
 
 if [ ! -f "$BPF_NAT6TO4_FILE" ]; then
 	echo "Missing nat6to4 helper. Build bpf nat6to4.o selftest first"
-	exit -1
+	exit 1
 fi
 
 if [[ $# -eq 0 ]]; then
 	run_all
 elif [[ $1 == "__subprocess" ]]; then
 	shift
-	run_one $@
+	run_one "$@"
 else
-	run_in_netns $@
+	run_in_netns "$@"
 fi
-- 
2.34.1