selftests/bpf: test_xdp_redirect: Rename BPF sections

SEC("redirect_to_111") and SEC("redirect_to_222") can't be loaded by the
__load() helper.

Rename both sections SEC("xdp") so it can be interpreted by the __load()
helper in upcoming patch.
Update the test_xdp_redirect.sh to use the program name instead of the
section name to load the BPF program.

Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Link: https://patch.msgid.link/20250110-xdp_redirect-v2-1-b8f3ae53e894@bootlin.com

Author: bastien-curutchet

tools/testing/selftests/bpf/progs/test_xdp_redirect.c

@@ -12,12 +12,12 @@
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 
-SEC("redirect_to_111")
+SEC("xdp")
 int xdp_redirect_to_111(struct xdp_md *xdp)
 {
 	return bpf_redirect(111, 0);
 }
-SEC("redirect_to_222")
+SEC("xdp")
 int xdp_redirect_to_222(struct xdp_md *xdp)
 {
 	return bpf_redirect(222, 0);

tools/testing/selftests/bpf/test_xdp_redirect.sh

@@ -56,8 +56,8 @@ test_xdp_redirect()
 
 	ip -n ${NS1} link set veth11 $xdpmode obj xdp_dummy.bpf.o sec xdp &> /dev/null
 	ip -n ${NS2} link set veth22 $xdpmode obj xdp_dummy.bpf.o sec xdp &> /dev/null
-	ip link set dev veth1 $xdpmode obj test_xdp_redirect.bpf.o sec redirect_to_222 &> /dev/null
-	ip link set dev veth2 $xdpmode obj test_xdp_redirect.bpf.o sec redirect_to_111 &> /dev/null
+	ip link set dev veth1 $xdpmode obj test_xdp_redirect.bpf.o program xdp_redirect_to_222 &> /dev/null
+	ip link set dev veth2 $xdpmode obj test_xdp_redirect.bpf.o program xdp_redirect_to_111 &> /dev/null
 
 	if ip netns exec ${NS1} ping -c 1 10.1.1.22 &> /dev/null &&
 	   ip netns exec ${NS2} ping -c 1 10.1.1.11 &> /dev/null; then