From 3ffab54602644f69485632435ef154a442ae7189 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Tue, 29 Aug 2017 16:38:11 +0200 Subject: samples/bpf: xdp_monitor tool based on tracepoints This tool xdp_monitor demonstrate how to use the different xdp_redirect tracepoints xdp_redirect{,_map}{,_err} from a BPF program. The default mode is to only monitor the error counters, to avoid affecting the per packet performance. Tracepoints comes with a base overhead of 25 nanosec for an attached bpf_prog, and 48 nanosec for using a full perf record (with non-matching filter). Thus, default loading the --stats mode could affect the maximum performance. This version of the tool is very simple and count all types of errors as one. It will be natural to extend this later with the different types of errors that can occur, which should help users quickly identify common mistakes. Because the TP_STRUCT was kept in sync all the tracepoints loads the same BPF code. It would also be natural to extend the map version to demonstrate how the map information could be used. Signed-off-by: Jesper Dangaard Brouer Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- samples/bpf/Makefile | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'samples/bpf/Makefile') diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index f1010fe759fe..cf17c7932a6e 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -39,6 +39,7 @@ hostprogs-y += per_socket_stats_example hostprogs-y += load_sock_ops hostprogs-y += xdp_redirect hostprogs-y += xdp_redirect_map +hostprogs-y += xdp_monitor hostprogs-y += syscall_tp # Libbpf dependencies @@ -83,6 +84,7 @@ test_map_in_map-objs := bpf_load.o $(LIBBPF) test_map_in_map_user.o per_socket_stats_example-objs := $(LIBBPF) cookie_uid_helper_example.o xdp_redirect-objs := bpf_load.o $(LIBBPF) xdp_redirect_user.o xdp_redirect_map-objs := bpf_load.o $(LIBBPF) xdp_redirect_map_user.o +xdp_monitor-objs := bpf_load.o $(LIBBPF) xdp_monitor_user.o syscall_tp-objs := bpf_load.o $(LIBBPF) syscall_tp_user.o # Tell kbuild to always build the programs @@ -127,6 +129,7 @@ always += tcp_iw_kern.o always += tcp_clamp_kern.o always += xdp_redirect_kern.o always += xdp_redirect_map_kern.o +always += xdp_monitor_kern.o always += syscall_tp_kern.o HOSTCFLAGS += -I$(objtree)/usr/include @@ -166,6 +169,7 @@ HOSTLOADLIBES_xdp_tx_iptunnel += -lelf HOSTLOADLIBES_test_map_in_map += -lelf HOSTLOADLIBES_xdp_redirect += -lelf HOSTLOADLIBES_xdp_redirect_map += -lelf +HOSTLOADLIBES_xdp_monitor += -lelf HOSTLOADLIBES_syscall_tp += -lelf # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline: -- cgit v1.2.3