1 // SPDX-License-Identifier: GPL-2.0
2 #define KBUILD_MODNAME "foo"
3 #include <uapi/linux/bpf.h>
4 #include "bpf_helpers.h"
5
6 #include "xdpsock.h"
7
8 struct bpf_map_def SEC("maps") qidconf_map = {
9 .type = BPF_MAP_TYPE_ARRAY,
10 .key_size = sizeof(int),
11 .value_size = sizeof(int),
12 .max_entries = 1,
13 };
14
15 struct bpf_map_def SEC("maps") xsks_map = {
16 .type = BPF_MAP_TYPE_XSKMAP,
17 .key_size = sizeof(int),
18 .value_size = sizeof(int),
19 .max_entries = 4,
20 };
21
22 struct bpf_map_def SEC("maps") rr_map = {
23 .type = BPF_MAP_TYPE_PERCPU_ARRAY,
24 .key_size = sizeof(int),
25 .value_size = sizeof(unsigned int),
26 .max_entries = 1,
27 };
28
29 SEC("xdp_sock")
xdp_sock_prog(struct xdp_md * ctx)30 int xdp_sock_prog(struct xdp_md *ctx)
31 {
32 int *qidconf, key = 0, idx;
33 unsigned int *rr;
34
35 qidconf = bpf_map_lookup_elem(&qidconf_map, &key);
36 if (!qidconf)
37 return XDP_ABORTED;
38
39 if (*qidconf != ctx->rx_queue_index)
40 return XDP_PASS;
41
42 #if RR_LB /* NB! RR_LB is configured in xdpsock.h */
43 rr = bpf_map_lookup_elem(&rr_map, &key);
44 if (!rr)
45 return XDP_ABORTED;
46
47 *rr = (*rr + 1) & (MAX_SOCKS - 1);
48 idx = *rr;
49 #else
50 idx = 0;
51 #endif
52
53 return bpf_redirect_map(&xsks_map, idx, 0);
54 }
55
56 char _license[] SEC("license") = "GPL";
57
