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Date: Fri, 19 Oct 2018 16:25:18 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Willem de Bruijn <willemb@...gle.com>,
Steffen Klassert <steffen.klassert@...unet.com>
Subject: [RFC PATCH v2 08/10] selftests: conditionally enable XDP support in udpgso_bench_rx
XDP support will be used by a later patch to test the GRO path
in a net namespace, leveraging the veth XDP implementation.
To avoid breaking existing setup, XDP support is conditionally
enabled and build only if llc is locally available.
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
tools/testing/selftests/net/Makefile | 69 +++++++++++++++++++
tools/testing/selftests/net/udpgso_bench_rx.c | 37 ++++++++++
tools/testing/selftests/net/xdp_dummy.c | 13 ++++
3 files changed, 119 insertions(+)
create mode 100644 tools/testing/selftests/net/xdp_dummy.c
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 256d82d5fa87..176459b7c4d6 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -16,8 +16,77 @@ TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls
KSFT_KHDR_INSTALL := 1
+
+# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
+# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
+LLC ?= llc
+CLANG ?= clang
+LLVM_OBJCOPY ?= llvm-objcopy
+BTF_PAHOLE ?= pahole
+HAS_LLC := $(shell which $(LLC) 2>/dev/null)
+
+# conditional enable testes requiring llc
+ifneq (, $(HAS_LLC))
+TEST_GEN_FILES += xdp_dummy.o
+endif
+
include ../lib.mk
+ifneq (, $(HAS_LLC))
+
+# Detect that we're cross compiling and use the cross compiler
+ifdef CROSS_COMPILE
+CLANG_ARCH_ARGS = -target $(ARCH)
+endif
+
+PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)
+
+# Let newer LLVM versions transparently probe the kernel for availability
+# of full BPF instruction set.
+ifeq ($(PROBE),)
+ CPU ?= probe
+else
+ CPU ?= generic
+endif
+
+SRC_PATH := $(abspath ../../../..)
+LIB_PATH := $(SRC_PATH)/tools/lib
+XDP_CFLAGS := -D SUPPORT_XDP=1 -I$(LIB_PATH)
+LIBBPF = $(LIB_PATH)/bpf/libbpf.a
+BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
+BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
+BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
+CLANG_SYS_INCLUDES := $(shell $(CLANG) -v -E - </dev/null 2>&1 \
+ | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }')
+CLANG_FLAGS = -I. -I$(SRC_PATH)/include -I../bpf/ \
+ $(CLANG_SYS_INCLUDES) -Wno-compare-distinct-pointer-types
+
+ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)
+ CLANG_CFLAGS += -g
+ LLC_FLAGS += -mattr=dwarfris
+ DWARF2BTF = y
+endif
+
+$(LIBBPF): FORCE
+# Fix up variables inherited from Kbuild that tools/ build system won't like
+ $(MAKE) -C $(dir $@) RM='rm -rf' LDFLAGS= srctree=$(SRC_PATH) O= $(nodir $@)
+
+$(OUTPUT)/udpgso_bench_rx: $(OUTPUT)/udpgso_bench_rx.c $(LIBBPF)
+ $(CC) -o $@ $(XDP_CFLAGS) $(CFLAGS) $(LOADLIBES) $(LDLIBS) $^ -lelf
+
+FORCE:
+
+# bpf program[s] generation
+$(OUTPUT)/%.o: %.c
+ $(CLANG) $(CLANG_FLAGS) \
+ -O2 -target bpf -emit-llvm -c $< -o - | \
+ $(LLC) -march=bpf -mcpu=$(CPU) $(LLC_FLAGS) -filetype=obj -o $@
+ifeq ($(DWARF2BTF),y)
+ $(BTF_PAHOLE) -J $@
+endif
+
+endif
+
$(OUTPUT)/reuseport_bpf_numa: LDFLAGS += -lnuma
$(OUTPUT)/tcp_mmap: LDFLAGS += -lpthread
$(OUTPUT)/tcp_inq: LDFLAGS += -lpthread
diff --git a/tools/testing/selftests/net/udpgso_bench_rx.c b/tools/testing/selftests/net/udpgso_bench_rx.c
index c55acdd1e27b..84f101852805 100644
--- a/tools/testing/selftests/net/udpgso_bench_rx.c
+++ b/tools/testing/selftests/net/udpgso_bench_rx.c
@@ -31,6 +31,10 @@
#include <sys/wait.h>
#include <unistd.h>
+#ifdef SUPPORT_XDP
+#include "bpf/libbpf.h"
+#endif
+
#ifndef UDP_GRO
#define UDP_GRO 104
#endif
@@ -40,6 +44,9 @@ static bool cfg_tcp;
static bool cfg_verify;
static bool cfg_read_all;
static bool cfg_gro_segment;
+#ifdef SUPPORT_XDP
+static int cfg_xdp_iface;
+#endif
static bool interrupted;
static unsigned long packets, bytes;
@@ -227,6 +234,13 @@ static void parse_opts(int argc, char **argv)
cfg_verify = true;
cfg_read_all = true;
break;
+#ifdef SUPPORT_XDP
+ case 'x':
+ cfg_xdp_iface = if_nametoindex(optarg);
+ if (!cfg_xdp_iface)
+ error(1, errno, "unknown interface %s", optarg);
+ break;
+#endif
}
}
@@ -240,6 +254,9 @@ static void parse_opts(int argc, char **argv)
static void do_recv(void)
{
unsigned long tnow, treport;
+#ifdef SUPPORT_XDP
+ int prog_fd = -1;
+#endif
int fd;
fd = do_socket(cfg_tcp);
@@ -250,6 +267,22 @@ static void do_recv(void)
error(1, errno, "setsockopt UDP_GRO");
}
+#ifdef SUPPORT_XDP
+ if (cfg_xdp_iface) {
+ struct bpf_prog_load_attr prog_load_attr = {
+ .prog_type = BPF_PROG_TYPE_XDP,
+ .file = "xdp_dummy.o",
+ };
+ struct bpf_object *obj;
+
+ if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
+ error(1, errno, "xdp program load failed\n");
+
+ if (bpf_set_link_xdp_fd(cfg_xdp_iface, prog_fd, 0) < 0)
+ error(1, errno, "link set xdp fd failed\n");
+ }
+#endif
+
treport = gettimeofday_ms() + 1000;
do {
do_poll(fd);
@@ -274,6 +307,10 @@ static void do_recv(void)
if (close(fd))
error(1, errno, "close");
+#ifdef SUPPORT_XDP
+ if (cfg_xdp_iface && bpf_set_link_xdp_fd(cfg_xdp_iface, -1, 0))
+ error(1, errno, "removing xdp program");
+#endif
}
int main(int argc, char **argv)
diff --git a/tools/testing/selftests/net/xdp_dummy.c b/tools/testing/selftests/net/xdp_dummy.c
new file mode 100644
index 000000000000..1a64cf5099ed
--- /dev/null
+++ b/tools/testing/selftests/net/xdp_dummy.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define KBUILD_MODNAME "xdp_dummy"
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+SEC("xdp_dummy")
+int xdp_dummy_prog(struct xdp_md *ctx)
+{
+ return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.17.2
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