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xdp: add tracepoint for devmap like cpumap have

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Notice how this allow us get XDP statistic without affecting the XDP
performance, as tracepoint is no-longer activated on a per packet basis.

V5: Spotted by John Fastabend.
 Fix 'sent' also counted 'drops' in this patch, a later patch corrected
 this, but it was a mistake in this intermediate step.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jesper Dangaard Brouer
2018-05-24 16:45:57 +02:00
committed by Alexei Starovoitov
parent 5d053f9da4
commit 38edddb811
4 changed files with 67 additions and 7 deletions
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39
include/trace/events/xdp.h
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@@ -229,6 +229,45 @@ TRACE_EVENT(xdp_cpumap_enqueue,
__entry->to_cpu)
);
TRACE_EVENT(xdp_devmap_xmit,
TP_PROTO(const struct bpf_map *map, u32 map_index,
int sent, int drops,
const struct net_device *from_dev,
const struct net_device *to_dev),
TP_ARGS(map, map_index, sent, drops, from_dev, to_dev),
TP_STRUCT__entry(
__field(int, map_id)
__field(u32, act)
__field(u32, map_index)
__field(int, drops)
__field(int, sent)
__field(int, from_ifindex)
__field(int, to_ifindex)
),
TP_fast_assign(
__entry->map_id = map->id;
__entry->act = XDP_REDIRECT;
__entry->map_index = map_index;
__entry->drops = drops;
__entry->sent = sent;
__entry->from_ifindex = from_dev->ifindex;
__entry->to_ifindex = to_dev->ifindex;
),
TP_printk("ndo_xdp_xmit"
" map_id=%d map_index=%d action=%s"
" sent=%d drops=%d"
" from_ifindex=%d to_ifindex=%d",
__entry->map_id, __entry->map_index,
__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
__entry->sent, __entry->drops,
__entry->from_ifindex, __entry->to_ifindex)
);
#endif /* _TRACE_XDP_H */
#include <trace/define_trace.h>