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bpf, selftests: Use bpf_tail_call_static where appropriate

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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
This commit is contained in:
Daniel Borkmann
2020-09-30 17:18:19 +02:00
committed by Alexei Starovoitov
parent 0e9f6841f6
commit faef26fa44
9 changed files with 49 additions and 47 deletions
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20
samples/bpf/sockex3_kern.c
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@@ -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;
}
}