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| author | Alexei Starovoitov <ast@plumgrid.com> | 2014-12-02 02:06:38 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-12-06 08:47:33 +0300 |
| commit | a80857822b0c2ed608c93504bd3687b78f20c619 (patch) | |
| tree | 8fb218a13a13a16d5083c7b831398f967137f152 /samples/bpf/libbpf.h | |
| parent | 249b812d8005ec38e351ee763ceb85d56b155064 (diff) | |
| download | linux-a80857822b0c2ed608c93504bd3687b78f20c619.tar.xz | |
samples: bpf: trivial eBPF program in C
this example does the same task as previous socket example
in assembler, but this one does it in C.
eBPF program in kernel does:
/* assume that packet is IPv4, load one byte of IP->proto */
int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
long *value;
value = bpf_map_lookup_elem(&my_map, &index);
if (value)
__sync_fetch_and_add(value, 1);
Corresponding user space reads map[tcp], map[udp], map[icmp]
and prints protocol stats every second
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf/libbpf.h')
| -rw-r--r-- | samples/bpf/libbpf.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h index cc62ad4d95de..58c5fe1bdba1 100644 --- a/samples/bpf/libbpf.h +++ b/samples/bpf/libbpf.h @@ -15,7 +15,7 @@ int bpf_prog_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns, int insn_len, const char *license); -#define LOG_BUF_SIZE 8192 +#define LOG_BUF_SIZE 65536 extern char bpf_log_buf[LOG_BUF_SIZE]; /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ |