ebpf: Added eBPF RSS program.

RSS program and Makefile to build it.
The bpftool used to generate '.h' file.
The data in that file may be loaded by libbpf.
EBPF compilation is not required for building qemu.
You can use Makefile if you need to regenerate rss.bpf.skeleton.h.

Signed-off-by: Yuri Benditovich <[email protected]>
Signed-off-by: Andrew Melnychenko <[email protected]>
Signed-off-by: Jason Wang <[email protected]>

Author: AndrewAtDaynix

tools/ebpf/Makefile.ebpf

@@ -0,0 +1,21 @@
+OBJS = rss.bpf.o
+
+LLC ?= llc
+CLANG ?= clang
+INC_FLAGS = `$(CLANG) -print-file-name=include`
+EXTRA_CFLAGS ?= -O2 -emit-llvm -fno-stack-protector
+
+all: $(OBJS)
+
+.PHONY: clean
+
+clean:
+	rm -f $(OBJS)
+
+$(OBJS):  %.o:%.c
+	$(CLANG) $(INC_FLAGS) \
+                -D__KERNEL__ -D__ASM_SYSREG_H \
+                -I../include $(LINUXINCLUDE) \
+                $(EXTRA_CFLAGS) -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
+	bpftool gen skeleton rss.bpf.o > rss.bpf.skeleton.h
+	cp rss.bpf.skeleton.h ../../ebpf/