samples/bpf: refactor BPF functionality testing scripts

Currently, some test scripts are experiencing minor errors related to
executing tests.

    $ sudo ./test_cgrp2_sock.sh
    ./test_cgrp2_sock.sh: 22: test_cgrp2_sock: not found

This problem occurs because the path to the execution target is not
properly specified. Therefore, this commit solves this problem by
specifying a relative path to its executables. This commit also makes
a concise refactoring of hard-coded BPF program names.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20230115071613.125791-3-danieltimlee@gmail.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

samples/bpf/lwt_len_hist.sh

@@ -4,7 +4,7 @@
 NS1=lwt_ns1
 VETH0=tst_lwt1a
 VETH1=tst_lwt1b
-
+BPF_PROG=lwt_len_hist_kern.o
 TRACE_ROOT=/sys/kernel/debug/tracing
 
 function cleanup {
@@ -30,7 +30,7 @@ ip netns exec $NS1 netserver
 
 echo 1 > ${TRACE_ROOT}/tracing_on
 cp /dev/null ${TRACE_ROOT}/trace
-ip route add 192.168.253.2/32 encap bpf out obj lwt_len_hist_kern.o section len_hist dev $VETH0
+ip route add 192.168.253.2/32 encap bpf out obj $BPF_PROG section len_hist dev $VETH0
 netperf -H 192.168.253.2 -t TCP_STREAM
 cat ${TRACE_ROOT}/trace | grep -v '^#'
 ./lwt_len_hist

samples/bpf/test_cgrp2_sock.sh

@@ -3,6 +3,8 @@
 
 # Test various socket options that can be set by attaching programs to cgroups.
 
+MY_DIR=$(dirname $0)
+TEST=$MY_DIR/test_cgrp2_sock
 CGRP_MNT="/tmp/cgroupv2-test_cgrp2_sock"
 
 ################################################################################
@@ -19,7 +21,7 @@ print_result()
 
 check_sock()
 {
-	out=$(test_cgrp2_sock)
+	out=$($TEST)
 	echo $out | grep -q "$1"
 	if [ $? -ne 0 ]; then
 		print_result 1 "IPv4: $2"
@@ -33,7 +35,7 @@ check_sock()
 
 check_sock6()
 {
-	out=$(test_cgrp2_sock -6)
+	out=$($TEST -6)
 	echo $out | grep -q "$1"
 	if [ $? -ne 0 ]; then
 		print_result 1 "IPv6: $2"
@@ -61,7 +63,7 @@ cleanup_and_exit()
 
 	[ -n "$msg" ] && echo "ERROR: $msg"
 
-	test_cgrp2_sock -d ${CGRP_MNT}/sockopts
+	$TEST -d ${CGRP_MNT}/sockopts
 	ip li del cgrp2_sock
 	umount ${CGRP_MNT}
 
@@ -98,7 +100,7 @@ check_sock6 "dev , mark 0, priority 0" "No programs attached"
 
 # verify device is set
 #
-test_cgrp2_sock -b cgrp2_sock ${CGRP_MNT}/sockopts
+$TEST -b cgrp2_sock ${CGRP_MNT}/sockopts
 if [ $? -ne 0 ]; then
 	cleanup_and_exit 1 "Failed to install program to set device"
 fi
@@ -107,7 +109,7 @@ check_sock6 "dev cgrp2_sock, mark 0, priority 0" "Device set"
 
 # verify mark is set
 #
-test_cgrp2_sock -m 666 ${CGRP_MNT}/sockopts
+$TEST -m 666 ${CGRP_MNT}/sockopts
 if [ $? -ne 0 ]; then
 	cleanup_and_exit 1 "Failed to install program to set mark"
 fi
@@ -116,7 +118,7 @@ check_sock6 "dev , mark 666, priority 0" "Mark set"
 
 # verify priority is set
 #
-test_cgrp2_sock -p 123 ${CGRP_MNT}/sockopts
+$TEST -p 123 ${CGRP_MNT}/sockopts
 if [ $? -ne 0 ]; then
 	cleanup_and_exit 1 "Failed to install program to set priority"
 fi
@@ -125,7 +127,7 @@ check_sock6 "dev , mark 0, priority 123" "Priority set"
 
 # all 3 at once
 #
-test_cgrp2_sock -b cgrp2_sock -m 666 -p 123 ${CGRP_MNT}/sockopts
+$TEST -b cgrp2_sock -m 666 -p 123 ${CGRP_MNT}/sockopts
 if [ $? -ne 0 ]; then
 	cleanup_and_exit 1 "Failed to install program to set device, mark and priority"
 fi

samples/bpf/test_cgrp2_sock2.sh

@@ -2,7 +2,10 @@
 # SPDX-License-Identifier: GPL-2.0
 
 BPFFS=/sys/fs/bpf
+MY_DIR=$(dirname $0)
+TEST=$MY_DIR/test_cgrp2_sock2
 LINK_PIN=$BPFFS/test_cgrp2_sock2
+BPF_PROG=$MY_DIR/sock_flags_kern.o
 
 function config_device {
 	ip netns add at_ns0
@@ -36,7 +39,7 @@ function config_bpffs {
 }
 
 function attach_bpf {
-	./test_cgrp2_sock2 /tmp/cgroupv2/foo sock_flags_kern.o $1
+	$TEST /tmp/cgroupv2/foo $BPF_PROG $1
 	[ $? -ne 0 ] && exit 1
 }
 

samples/bpf/test_cgrp2_tc.sh

@@ -76,8 +76,8 @@ setup_net() {
 	    sysctl -q net.ipv6.conf.$HOST_IFC.disable_ipv6=0
 	    sysctl -q net.ipv6.conf.$HOST_IFC.accept_dad=0
 
-	    $IP netns add ns || return $?
-	    $IP link set dev $NS_IFC netns ns || return $?
+	    $IP netns add $NS || return $?
+	    $IP link set dev $NS_IFC netns $NS || return $?
 	    $IP -n $NS link set dev $NS_IFC up || return $?
 	    $IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.disable_ipv6=0
 	    $IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.accept_dad=0

samples/bpf/test_lwt_bpf.sh

@@ -19,6 +19,8 @@ IPVETH3="192.168.111.2"
 
 IP_LOCAL="192.168.99.1"
 
+PROG_SRC="test_lwt_bpf.c"
+BPF_PROG="test_lwt_bpf.o"
 TRACE_ROOT=/sys/kernel/debug/tracing
 
 function lookup_mac()
@@ -36,7 +38,7 @@ function lookup_mac()
 
 function cleanup {
 	set +ex
-	rm test_lwt_bpf.o 2> /dev/null
+	rm $BPF_PROG 2> /dev/null
 	ip link del $VETH0 2> /dev/null
 	ip link del $VETH1 2> /dev/null
 	ip link del $VETH2 2> /dev/null
@@ -76,7 +78,7 @@ function install_test {
 	cleanup_routes
 	cp /dev/null ${TRACE_ROOT}/trace
 
-	OPTS="encap bpf headroom 14 $1 obj test_lwt_bpf.o section $2 $VERBOSE"
+	OPTS="encap bpf headroom 14 $1 obj $BPF_PROG section $2 $VERBOSE"
 
 	if [ "$1" == "in" ];  then
 		ip route add table local local ${IP_LOCAL}/32 $OPTS dev lo
@@ -374,7 +376,7 @@ DST_IFINDEX=$(cat /sys/class/net/$VETH0/ifindex)
 
 CLANG_OPTS="-O2 -target bpf -I ../include/"
 CLANG_OPTS+=" -DSRC_MAC=$SRC_MAC -DDST_MAC=$DST_MAC -DDST_IFINDEX=$DST_IFINDEX"
-clang $CLANG_OPTS -c test_lwt_bpf.c -o test_lwt_bpf.o
+clang $CLANG_OPTS -c $PROG_SRC -o $BPF_PROG
 
 test_ctx_xmit
 test_ctx_out