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/* SPDX-License-Identifier: GPL-2.0 */
/* Used *ONLY* by BPF-prog running kernel side. */
#ifndef __XDP_STATS_KERN_H
#define __XDP_STATS_KERN_H
/* Data record type 'struct datarec' is defined in common/xdp_stats_kern_user.h,
* programs using this header must first include that file.
*/
#ifndef __XDP_STATS_KERN_USER_H
#warning "You forgot to #include <../common/xdp_stats_kern_user.h>"
#include <../common/xdp_stats_kern_user.h>
#endif
/* Keeps stats per (enum) xdp_action */
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__type(key, __u32);
__type(value, struct datarec);
__uint(max_entries, XDP_ACTION_MAX);
} xdp_stats_map SEC(".maps");
static __always_inline
__u32 xdp_stats_record_action(struct xdp_md *ctx, __u32 action)
{
if (action >= XDP_ACTION_MAX)
return XDP_ABORTED;
/* Lookup in kernel BPF-side return pointer to actual data record */
struct datarec *rec = bpf_map_lookup_elem(&xdp_stats_map, &action);
if (!rec)
return XDP_ABORTED;
/* BPF_MAP_TYPE_PERCPU_ARRAY returns a data record specific to current
* CPU and XDP hooks runs under Softirq, which makes it safe to update
* without atomic operations.
*/
rec->rx_packets++;
rec->rx_bytes += (ctx->data_end - ctx->data);
return action;
}
#endif /* __XDP_STATS_KERN_H */
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