selftests/bpf: test_xdp_vlan: Rename BPF sections

The __load() helper expects BPF sections to be names 'xdp' or 'tc'

Rename BPF sections so they can be loaded with the __load() helper in
upcoming patch.
Rename the BPF functions with their previous section's name.
Update the 'ip link' commands in the script to use the program name
instead of the section name to load the BPF program.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250221-xdp_vlan-v1-1-7d29847169af@bootlin.com

Author: bastien-curutchet

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

@@ -102,8 +102,8 @@ bool parse_eth_frame(struct ethhdr *eth, void *data_end, struct parse_pkt *pkt)
 #define TESTVLAN 4011 /* 0xFAB */
 // #define TO_VLAN  4000 /* 0xFA0 (hint 0xOA0 = 160) */
 
-SEC("xdp_drop_vlan_4011")
-int  xdp_prognum0(struct xdp_md *ctx)
+SEC("xdp")
+int xdp_drop_vlan_4011(struct xdp_md *ctx)
 {
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data     = (void *)(long)ctx->data;
@@ -144,8 +144,8 @@ Load prog with ip tool:
 /* Changing VLAN to zero, have same practical effect as removing the VLAN. */
 #define TO_VLAN	0
 
-SEC("xdp_vlan_change")
-int  xdp_prognum1(struct xdp_md *ctx)
+SEC("xdp")
+int xdp_vlan_change(struct xdp_md *ctx)
 {
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data     = (void *)(long)ctx->data;
@@ -178,8 +178,8 @@ int  xdp_prognum1(struct xdp_md *ctx)
 #endif
 #define VLAN_HDR_SZ	4	/* bytes */
 
-SEC("xdp_vlan_remove_outer")
-int  xdp_prognum2(struct xdp_md *ctx)
+SEC("xdp")
+int xdp_vlan_remove_outer(struct xdp_md *ctx)
 {
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data     = (void *)(long)ctx->data;
@@ -224,8 +224,8 @@ void shift_mac_4bytes_32bit(void *data)
 	p[1] = p[0];
 }
 
-SEC("xdp_vlan_remove_outer2")
-int  xdp_prognum3(struct xdp_md *ctx)
+SEC("xdp")
+int xdp_vlan_remove_outer2(struct xdp_md *ctx)
 {
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data     = (void *)(long)ctx->data;
@@ -254,8 +254,8 @@ int  xdp_prognum3(struct xdp_md *ctx)
  * The TC-clsact eBPF programs (currently) need to be attach via TC commands
  */
 
-SEC("tc_vlan_push")
-int _tc_progA(struct __sk_buff *ctx)
+SEC("tc")
+int tc_vlan_push(struct __sk_buff *ctx)
 {
 	bpf_skb_vlan_push(ctx, bpf_htons(ETH_P_8021Q), TESTVLAN);
 

tools/testing/selftests/bpf/test_xdp_vlan.sh

@@ -204,15 +204,15 @@ export BPF_FILE=test_xdp_vlan.bpf.o
 
 # First test: Remove VLAN by setting VLAN ID 0, using "xdp_vlan_change"
 export XDP_PROG=xdp_vlan_change
-ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE object $BPF_FILE section $XDP_PROG
+ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE object $BPF_FILE program $XDP_PROG
 
 # In ns1: egress use TC to add back VLAN tag 4011
 #  (del cmd)
 #  tc qdisc del dev $DEVNS1 clsact 2> /dev/null
 #
 ip netns exec ${NS1} tc qdisc add dev $DEVNS1 clsact
 ip netns exec ${NS1} tc filter add dev $DEVNS1 egress \
-  prio 1 handle 1 bpf da obj $BPF_FILE sec tc_vlan_push
+  prio 1 handle 1 bpf da obj $BPF_FILE program tc_vlan_push
 
 # Now the namespaces can reach each-other, test with ping:
 ip netns exec ${NS2} ping -i 0.2 -W 2 -c 2 $IPADDR1
@@ -226,7 +226,7 @@ ip netns exec ${NS1} ping -i 0.2 -W 2 -c 2 $IPADDR2
 #
 export XDP_PROG=xdp_vlan_remove_outer2
 ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE off
-ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE object $BPF_FILE section $XDP_PROG
+ip netns exec ${NS1} ip link set $DEVNS1 $XDP_MODE object $BPF_FILE program $XDP_PROG
 
 # Now the namespaces should still be able reach each-other, test with ping:
 ip netns exec ${NS2} ping -i 0.2 -W 2 -c 2 $IPADDR1