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xdp/trace: extend tracepoint in devmap with an err

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Extending tracepoint xdp:xdp_devmap_xmit in devmap with an err code
allow people to easier identify the reason behind the ndo_xdp_xmit
call to a given driver is failing.

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 16:46:17 +02:00 committed by Alexei Starovoitov
parent 735fc4054b
commit e74de52e55
2 changed files with 9 additions and 6 deletions
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10
include/trace/events/xdp.h
View File

@ -234,9 +234,9 @@ 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),
const struct net_device *to_dev, int err),
TP_ARGS(map, map_index, sent, drops, from_dev, to_dev),
TP_ARGS(map, map_index, sent, drops, from_dev, to_dev, err),
TP_STRUCT__entry(
__field(int, map_id)
@ -246,6 +246,7 @@ TRACE_EVENT(xdp_devmap_xmit,
__field(int, sent)
__field(int, from_ifindex)
__field(int, to_ifindex)
__field(int, err)
),
TP_fast_assign(
@ -256,16 +257,17 @@ TRACE_EVENT(xdp_devmap_xmit,
__entry->sent = sent;
__entry->from_ifindex = from_dev->ifindex;
__entry->to_ifindex = to_dev->ifindex;
__entry->err = err;
),
TP_printk("ndo_xdp_xmit"
" map_id=%d map_index=%d action=%s"
" sent=%d drops=%d"
" from_ifindex=%d to_ifindex=%d",
" from_ifindex=%d to_ifindex=%d err=%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)
__entry->from_ifindex, __entry->to_ifindex, __entry->err)
);
#endif /* _TRACE_XDP_H */

5
kernel/bpf/devmap.c
View File

@ -220,7 +220,7 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj,
struct xdp_bulk_queue *bq)
{
struct net_device *dev = obj->dev;
int sent = 0, drops = 0;
int sent = 0, drops = 0, err = 0;
int i;
if (unlikely(!bq->count))
@ -234,6 +234,7 @@ static int bq_xmit_all(struct bpf_dtab_netdev *obj,
sent = dev->netdev_ops->ndo_xdp_xmit(dev, bq->count, bq->q);
if (sent < 0) {
err = sent;
sent = 0;
goto error;
}
@ -242,7 +243,7 @@ out:
bq->count = 0;
trace_xdp_devmap_xmit(&obj->dtab->map, obj->bit,
sent, drops, bq->dev_rx, dev);
sent, drops, bq->dev_rx, dev, err);
bq->dev_rx = NULL;
return 0;
error: