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authorDaniel Borkmann <daniel@iogearbox.net>2020-09-30 17:18:19 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-09-30 11:50:35 -0700
commitfaef26fa444dc44eeff70c9a63ebe7fef00b6c37 (patch)
tree842d71671220a2634e8cfbe51b07565cc0820347 /samples/bpf
parent0e9f6841f664f801a69d27f765dc70b8a93e1959 (diff)
downloadlinux-stericsson-faef26fa444dc44eeff70c9a63ebe7fef00b6c37.tar.gz
bpf, selftests: Use bpf_tail_call_static where appropriate
For those locations where we use an immediate tail call map index use the newly added bpf_tail_call_static() helper. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/3cfb2b799a62d22c6e7ae5897c23940bdcc24cbc.1601477936.git.daniel@iogearbox.net
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/sockex3_kern.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/samples/bpf/sockex3_kern.c b/samples/bpf/sockex3_kern.c
index cab9cca0b8eb..8142d02b33e6 100644
--- a/samples/bpf/sockex3_kern.c
+++ b/samples/bpf/sockex3_kern.c
@@ -31,28 +31,30 @@ struct {
#define PARSE_IP 3
#define PARSE_IPV6 4
-/* protocol dispatch routine.
- * It tail-calls next BPF program depending on eth proto
- * Note, we could have used:
- * bpf_tail_call(skb, &jmp_table, proto);
- * but it would need large prog_array
+/* Protocol dispatch routine. It tail-calls next BPF program depending
+ * on eth proto. Note, we could have used ...
+ *
+ * bpf_tail_call(skb, &jmp_table, proto);
+ *
+ * ... but it would need large prog_array and cannot be optimised given
+ * the map key is not static.
*/
static inline void parse_eth_proto(struct __sk_buff *skb, u32 proto)
{
switch (proto) {
case ETH_P_8021Q:
case ETH_P_8021AD:
- bpf_tail_call(skb, &jmp_table, PARSE_VLAN);
+ bpf_tail_call_static(skb, &jmp_table, PARSE_VLAN);
break;
case ETH_P_MPLS_UC:
case ETH_P_MPLS_MC:
- bpf_tail_call(skb, &jmp_table, PARSE_MPLS);
+ bpf_tail_call_static(skb, &jmp_table, PARSE_MPLS);
break;
case ETH_P_IP:
- bpf_tail_call(skb, &jmp_table, PARSE_IP);
+ bpf_tail_call_static(skb, &jmp_table, PARSE_IP);
break;
case ETH_P_IPV6:
- bpf_tail_call(skb, &jmp_table, PARSE_IPV6);
+ bpf_tail_call_static(skb, &jmp_table, PARSE_IPV6);
break;
}
}