afs: Provide a splice-read wrapper
[linux-block.git] / samples / bpf / xdp_redirect_map_multi.bpf.c
1 // SPDX-License-Identifier: GPL-2.0
2 #define KBUILD_MODNAME "foo"
3
4 #include "vmlinux.h"
5 #include "xdp_sample.bpf.h"
6 #include "xdp_sample_shared.h"
7
8 struct {
9         __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
10         __uint(key_size, sizeof(int));
11         __uint(value_size, sizeof(int));
12         __uint(max_entries, 32);
13 } forward_map_general SEC(".maps");
14
15 struct {
16         __uint(type, BPF_MAP_TYPE_DEVMAP_HASH);
17         __uint(key_size, sizeof(int));
18         __uint(value_size, sizeof(struct bpf_devmap_val));
19         __uint(max_entries, 32);
20 } forward_map_native SEC(".maps");
21
22 /* map to store egress interfaces mac addresses */
23 struct {
24         __uint(type, BPF_MAP_TYPE_HASH);
25         __type(key, u32);
26         __type(value, __be64);
27         __uint(max_entries, 32);
28 } mac_map SEC(".maps");
29
30 static int xdp_redirect_map(struct xdp_md *ctx, void *forward_map)
31 {
32         u32 key = bpf_get_smp_processor_id();
33         struct datarec *rec;
34
35         rec = bpf_map_lookup_elem(&rx_cnt, &key);
36         if (!rec)
37                 return XDP_PASS;
38         NO_TEAR_INC(rec->processed);
39
40         return bpf_redirect_map(forward_map, 0,
41                                 BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS);
42 }
43
44 SEC("xdp")
45 int xdp_redirect_map_general(struct xdp_md *ctx)
46 {
47         return xdp_redirect_map(ctx, &forward_map_general);
48 }
49
50 SEC("xdp")
51 int xdp_redirect_map_native(struct xdp_md *ctx)
52 {
53         return xdp_redirect_map(ctx, &forward_map_native);
54 }
55
56 SEC("xdp/devmap")
57 int xdp_devmap_prog(struct xdp_md *ctx)
58 {
59         void *data_end = (void *)(long)ctx->data_end;
60         void *data = (void *)(long)ctx->data;
61         u32 key = ctx->egress_ifindex;
62         struct ethhdr *eth = data;
63         __be64 *mac;
64         u64 nh_off;
65
66         nh_off = sizeof(*eth);
67         if (data + nh_off > data_end)
68                 return XDP_DROP;
69
70         mac = bpf_map_lookup_elem(&mac_map, &key);
71         if (mac)
72                 __builtin_memcpy(eth->h_source, mac, ETH_ALEN);
73
74         return XDP_PASS;
75 }
76
77 char _license[] SEC("license") = "GPL";