// SPDX-License-Identifier: GPL-2.0 #include <vmlinux.h> #include "xdp_metadata.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> struct { __uint(type, BPF_MAP_TYPE_XSKMAP); __uint(max_entries, 4); __type(key, __u32); __type(value, __u32); } xsk SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 1); __type(key, __u32); __type(value, __u32); } prog_arr SEC(".maps"); extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx, __u64 *timestamp) __ksym; extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash, enum xdp_rss_hash_type *rss_type) __ksym; SEC("xdp") int rx(struct xdp_md *ctx) { void *data, *data_meta; struct xdp_meta *meta; u64 timestamp = -1; int ret; /* Reserve enough for all custom metadata. */ ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta)); if (ret != 0) return XDP_DROP; data = (void *)(long)ctx->data; data_meta = (void *)(long)ctx->data_meta; if (data_meta + sizeof(struct xdp_meta) > data) return XDP_DROP; meta = data_meta; /* Export metadata. */ /* We expect veth bpf_xdp_metadata_rx_timestamp to return 0 HW * timestamp, so put some non-zero value into AF_XDP frame for * the userspace. */ bpf_xdp_metadata_rx_timestamp(ctx, ×tamp); if (timestamp == 0) meta->rx_timestamp = 1; bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type); return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS); } char _license[] SEC("license") = "GPL";