On Wed, 5 Jun 2019 14:36:12 +0900 Toshiaki Makita <toshiaki.makita1@xxxxxxxxx> wrote: > This is introduced for admins to check what is happening on XDP_TX when > bulk XDP_TX is in use, which will be first introduced in veth in next > commit. Is the plan that this tracepoint 'xdp:xdp_bulk_tx' should be used by all drivers? (more below) > Signed-off-by: Toshiaki Makita <toshiaki.makita1@xxxxxxxxx> > --- > include/trace/events/xdp.h | 25 +++++++++++++++++++++++++ > kernel/bpf/core.c | 1 + > 2 files changed, 26 insertions(+) > > diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h > index e95cb86..e06ea65 100644 > --- a/include/trace/events/xdp.h > +++ b/include/trace/events/xdp.h > @@ -50,6 +50,31 @@ > __entry->ifindex) > ); > > +TRACE_EVENT(xdp_bulk_tx, > + > + TP_PROTO(const struct net_device *dev, > + int sent, int drops, int err), > + > + TP_ARGS(dev, sent, drops, err), > + > + TP_STRUCT__entry( All other tracepoints in this file starts with: __field(int, prog_id) __field(u32, act) or __field(int, map_id) __field(u32, act) Could you please add those? > + __field(int, ifindex) > + __field(int, drops) > + __field(int, sent) > + __field(int, err) > + ), The reason is that this make is easier to attach to multiple tracepoints, and extract the same value. Example with bpftrace oneliner: $ sudo bpftrace -e 'tracepoint:xdp:xdp_* { @action[args->act] = count(); }' Attaching 8 probes... ^C @action[4]: 30259246 @action[0]: 34489024 XDP_ABORTED = 0 XDP_REDIRECT= 4 > + > + TP_fast_assign( __entry->act = XDP_TX; > + __entry->ifindex = dev->ifindex; > + __entry->drops = drops; > + __entry->sent = sent; > + __entry->err = err; > + ), > + > + TP_printk("ifindex=%d sent=%d drops=%d err=%d", > + __entry->ifindex, __entry->sent, __entry->drops, __entry->err) > +); > + Other fun bpftrace stuff: sudo bpftrace -e 'tracepoint:xdp:xdp_*map* { @map_id[comm, args->map_id] = count(); }' Attaching 5 probes... ^C @map_id[swapper/2, 113]: 1428 @map_id[swapper/0, 113]: 2085 @map_id[ksoftirqd/4, 113]: 2253491 @map_id[ksoftirqd/2, 113]: 25677560 @map_id[ksoftirqd/0, 113]: 29004338 @map_id[ksoftirqd/3, 113]: 31034885 $ bpftool map list id 113 113: devmap name tx_port flags 0x0 key 4B value 4B max_entries 100 memlock 4096B p.s. People should look out for Brendan Gregg's upcoming book on BPF performance tools, from which I learned to use bpftrace :-) -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer