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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
7cf245a37e
Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.
To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.
Fixes: 6910d7d386 ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
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*
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* Example howto extract XDP RX-queue info
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*/
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/if_ether.h>
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#include <uapi/linux/in.h>
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#include <bpf/bpf_helpers.h>
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/* Config setup from with userspace
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*
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* User-side setup ifindex in config_map, to verify that
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* ctx->ingress_ifindex is correct (against configured ifindex)
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*/
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struct config {
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__u32 action;
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int ifindex;
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__u32 options;
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};
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enum cfg_options_flags {
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NO_TOUCH = 0x0U,
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READ_MEM = 0x1U,
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SWAP_MAC = 0x2U,
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, int);
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__type(value, struct config);
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__uint(max_entries, 1);
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} config_map SEC(".maps");
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/* Common stats data record (shared with userspace) */
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struct datarec {
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__u64 processed;
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__u64 issue;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, struct datarec);
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__uint(max_entries, 1);
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} stats_global_map SEC(".maps");
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#define MAX_RXQs 64
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/* Stats per rx_queue_index (per CPU) */
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, struct datarec);
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__uint(max_entries, MAX_RXQs + 1);
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} rx_queue_index_map SEC(".maps");
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static __always_inline
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void swap_src_dst_mac(void *data)
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{
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unsigned short *p = data;
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unsigned short dst[3];
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dst[0] = p[0];
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dst[1] = p[1];
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dst[2] = p[2];
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p[0] = p[3];
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p[1] = p[4];
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p[2] = p[5];
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p[3] = dst[0];
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p[4] = dst[1];
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p[5] = dst[2];
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}
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SEC("xdp_prog0")
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int xdp_prognum0(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct datarec *rec, *rxq_rec;
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int ingress_ifindex;
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struct config *config;
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u32 key = 0;
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/* Global stats record */
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rec = bpf_map_lookup_elem(&stats_global_map, &key);
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if (!rec)
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return XDP_ABORTED;
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rec->processed++;
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/* Accessing ctx->ingress_ifindex, cause BPF to rewrite BPF
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* instructions inside kernel to access xdp_rxq->dev->ifindex
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*/
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ingress_ifindex = ctx->ingress_ifindex;
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config = bpf_map_lookup_elem(&config_map, &key);
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if (!config)
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return XDP_ABORTED;
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/* Simple test: check ctx provided ifindex is as expected */
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if (ingress_ifindex != config->ifindex) {
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/* count this error case */
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rec->issue++;
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return XDP_ABORTED;
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}
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/* Update stats per rx_queue_index. Handle if rx_queue_index
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* is larger than stats map can contain info for.
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*/
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key = ctx->rx_queue_index;
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if (key >= MAX_RXQs)
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key = MAX_RXQs;
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rxq_rec = bpf_map_lookup_elem(&rx_queue_index_map, &key);
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if (!rxq_rec)
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return XDP_ABORTED;
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rxq_rec->processed++;
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if (key == MAX_RXQs)
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rxq_rec->issue++;
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/* Default: Don't touch packet data, only count packets */
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if (unlikely(config->options & (READ_MEM|SWAP_MAC))) {
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struct ethhdr *eth = data;
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if (eth + 1 > data_end)
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return XDP_ABORTED;
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/* Avoid compiler removing this: Drop non 802.3 Ethertypes */
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if (ntohs(eth->h_proto) < ETH_P_802_3_MIN)
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return XDP_ABORTED;
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/* XDP_TX requires changing MAC-addrs, else HW may drop.
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* Can also be enabled with --swapmac (for test purposes)
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*/
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if (unlikely(config->options & SWAP_MAC))
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swap_src_dst_mac(data);
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}
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return config->action;
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}
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char _license[] SEC("license") = "GPL";
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