mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +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
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/ptrace.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
|
|
#define SAMPLE_SIZE 64ul
|
|
#define MAX_CPUS 128
|
|
|
|
struct bpf_map_def SEC("maps") my_map = {
|
|
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
|
|
.key_size = sizeof(int),
|
|
.value_size = sizeof(u32),
|
|
.max_entries = MAX_CPUS,
|
|
};
|
|
|
|
SEC("xdp_sample")
|
|
int xdp_sample_prog(struct xdp_md *ctx)
|
|
{
|
|
void *data_end = (void *)(long)ctx->data_end;
|
|
void *data = (void *)(long)ctx->data;
|
|
|
|
/* Metadata will be in the perf event before the packet data. */
|
|
struct S {
|
|
u16 cookie;
|
|
u16 pkt_len;
|
|
} __packed metadata;
|
|
|
|
if (data < data_end) {
|
|
/* The XDP perf_event_output handler will use the upper 32 bits
|
|
* of the flags argument as a number of bytes to include of the
|
|
* packet payload in the event data. If the size is too big, the
|
|
* call to bpf_perf_event_output will fail and return -EFAULT.
|
|
*
|
|
* See bpf_xdp_event_output in net/core/filter.c.
|
|
*
|
|
* The BPF_F_CURRENT_CPU flag means that the event output fd
|
|
* will be indexed by the CPU number in the event map.
|
|
*/
|
|
u64 flags = BPF_F_CURRENT_CPU;
|
|
u16 sample_size;
|
|
int ret;
|
|
|
|
metadata.cookie = 0xdead;
|
|
metadata.pkt_len = (u16)(data_end - data);
|
|
sample_size = min(metadata.pkt_len, SAMPLE_SIZE);
|
|
flags |= (u64)sample_size << 32;
|
|
|
|
ret = bpf_perf_event_output(ctx, &my_map, flags,
|
|
&metadata, sizeof(metadata));
|
|
if (ret)
|
|
bpf_printk("perf_event_output failed: %d\n", ret);
|
|
}
|
|
|
|
return XDP_PASS;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|