On Thu, Jul 21, 2022 at 05:36:24PM +0200, Benjamin Tissoires wrote:
Add a more complete HID-BPF example.
Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com
changes in v7:
- remove unnecessary __must_check definition
new in v6
fix surface dial
samples/bpf/.gitignore | 1 + samples/bpf/Makefile | 6 +- samples/bpf/hid_surface_dial.bpf.c | 161 ++++++++++++++++++++++ samples/bpf/hid_surface_dial.c | 212 +++++++++++++++++++++++++++++ 4 files changed, 379 insertions(+), 1 deletion(-) create mode 100644 samples/bpf/hid_surface_dial.bpf.c create mode 100644 samples/bpf/hid_surface_dial.c
diff --git a/samples/bpf/.gitignore b/samples/bpf/.gitignore index 65440bd618b2..6a1079d3d064 100644 --- a/samples/bpf/.gitignore +++ b/samples/bpf/.gitignore @@ -3,6 +3,7 @@ cpustat fds_example hbm hid_mouse +hid_surface_dial ibumad lathist lwt_len_hist diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index a965bbfaca47..5f5aa7b32565 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -58,6 +58,7 @@ tprogs-y += xdp_redirect tprogs-y += xdp_monitor tprogs-y += hid_mouse +tprogs-y += hid_surface_dial # Libbpf dependencies LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf @@ -122,6 +123,7 @@ xdp_monitor-objs := xdp_monitor_user.o $(XDP_SAMPLE) xdp_router_ipv4-objs := xdp_router_ipv4_user.o $(XDP_SAMPLE) hid_mouse-objs := hid_mouse.o +hid_surface_dial-objs := hid_surface_dial.o # Tell kbuild to always build the programs always-y := $(tprogs-y) @@ -343,6 +345,7 @@ $(obj)/hbm.o: $(src)/hbm.h $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h $(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h +$(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h # Override includes for xdp_sample_user.o because $(srctree)/usr/include in # TPROGS_CFLAGS causes conflicts @@ -429,9 +432,10 @@ $(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL) $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@ # Generate BPF skeletons for non XDP progs -OTHER_BPF_SKELS := hid_mouse.skel.h +OTHER_BPF_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h hid_mouse.skel.h-deps := hid_mouse.bpf.o +hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o OTHER_BPF_SRCS_LINKED := $(patsubst %.skel.h,%.bpf.c, $(OTHER_BPF_SKELS)) OTHER_BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(OTHER_BPF_SRCS_LINKED)) diff --git a/samples/bpf/hid_surface_dial.bpf.c b/samples/bpf/hid_surface_dial.bpf.c new file mode 100644 index 000000000000..16c821d3decf --- /dev/null +++ b/samples/bpf/hid_surface_dial.bpf.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2022 Benjamin Tissoires
- */
No hints as to what this, and the other program are doing here in a comment?
- while (running)
;
That's burning up a CPU, why not sleep/yield/something to allow the cpu to not just pound on this variable and allow other things to happen?
thanks,
greg k-h