diff options
| author | Jesper Dangaard Brouer <brouer@redhat.com> | 2018-05-24 17:46:17 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-05-25 04:36:15 +0300 |
| commit | e74de52e55c092e7113f839e74400ce9dbe12ceb (patch) | |
| tree | 811913647e2becd8bfa53ea1a36bf4dc631aeb1d | |
| parent | 735fc4054b3a25034445c6713d259da0f96f8131 (diff) | |
| download | linux-e74de52e55c092e7113f839e74400ce9dbe12ceb.tar.xz | |
xdp/trace: extend tracepoint in devmap with an err
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>
| -rw-r--r-- | include/trace/events/xdp.h | 10 | ||||
| -rw-r--r-- | kernel/bpf/devmap.c | 5 |
2 files changed, 9 insertions, 6 deletions
diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h index 2e9ef0650144..1ecf4c67fcf7 100644 --- a/include/trace/events/xdp.h +++ b/include/trace/events/xdp.h @@ -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 */ diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 77908311ec98..ae16d0c373ef 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -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: |