[PATCH bpf-next] selftests/bpf: drop xdping tool

["Alexis Lothoré (eBPF Foundation)" <alexis.lothore@bootlin.com>]

As part of a larger cleanup effort in the bpf selftests directory,
tests and scripts are either being converted to the test_progs framework
(so they are executed automatically in bpf CI), or removed if not
relevant for such integration.

The test_xdping.sh script (with the associated xdping.c) acts as a RTT
measurement tool, by attaching two small xdp programs to two interfaces.
Converting this test to test_progs may not make much sense:
- RTT measurement does not really fit in the scope of a functional test,
  this is rather about measuring some performance level.
- there are other existing tests in test_progs that actively validate
  XDP features like program attachment, return value processing, packet
  modification, etc

Drop test_xdping.sh and the corresponding xdping.c userspace part. Keep
the ebpf part (xdping_kern.c), as it is used by another test integrated
in test_progs (btf_dump)

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
---
 tools/testing/selftests/bpf/.gitignore     |   1 -
 tools/testing/selftests/bpf/Makefile       |   3 -
 tools/testing/selftests/bpf/test_xdping.sh | 103 ------------
 tools/testing/selftests/bpf/xdping.c       | 254 -----------------------------
 4 files changed, 361 deletions(-)

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index bfdc5518ecc8..986a6389186b 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore
@@ -21,7 +21,6 @@ test_lirc_mode2_user
 flow_dissector_load
 test_tcpnotify_user
 test_libbpf
-xdping
 test_cpp
 *.d
 *.subskel.h
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 78e60040811e..00a986a7d088 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -111,7 +111,6 @@ TEST_FILES = xsk_prereqs.sh $(wildcard progs/btf_dump_test_case_*.c)
 # Order correspond to 'make run_tests' order
 TEST_PROGS := test_kmod.sh \
 	test_lirc_mode2.sh \
-	test_xdping.sh \
 	test_bpftool_build.sh \
 	test_doc_build.sh \
 	test_xsk.sh \
@@ -134,7 +133,6 @@ TEST_GEN_PROGS_EXTENDED = \
 	xdp_features \
 	xdp_hw_metadata \
 	xdp_synproxy \
-	xdping \
 	xskxceiver
 
 TEST_GEN_FILES += $(TEST_KMODS) liburandom_read.so urandom_read sign-file uprobe_multi
@@ -320,7 +318,6 @@ $(OUTPUT)/test_tcpnotify_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(TRACE_HELP
 $(OUTPUT)/test_sock_fields: $(CGROUP_HELPERS) $(TESTING_HELPERS)
 $(OUTPUT)/test_tag: $(TESTING_HELPERS)
 $(OUTPUT)/test_lirc_mode2_user: $(TESTING_HELPERS)
-$(OUTPUT)/xdping: $(TESTING_HELPERS)
 $(OUTPUT)/flow_dissector_load: $(TESTING_HELPERS)
 $(OUTPUT)/test_maps: $(TESTING_HELPERS)
 $(OUTPUT)/test_verifier: $(TESTING_HELPERS) $(CAP_HELPERS) $(UNPRIV_HELPERS)
diff --git a/tools/testing/selftests/bpf/test_xdping.sh b/tools/testing/selftests/bpf/test_xdping.sh
deleted file mode 100755
index c3d82e0a7378..000000000000
--- a/tools/testing/selftests/bpf/test_xdping.sh
+++ /dev/null
@@ -1,103 +0,0 @@
-#!/bin/bash
-# SPDX-License-Identifier: GPL-2.0
-
-# xdping tests
-#   Here we setup and teardown configuration required to run
-#   xdping, exercising its options.
-#
-#   Setup is similar to test_tunnel tests but without the tunnel.
-#
-# Topology:
-# ---------
-#     root namespace   |     tc_ns0 namespace
-#                      |
-#      ----------      |     ----------
-#      |  veth1  | --------- |  veth0  |
-#      ----------    peer    ----------
-#
-# Device Configuration
-# --------------------
-# Root namespace with BPF
-# Device names and addresses:
-#	veth1 IP: 10.1.1.200
-#	xdp added to veth1, xdpings originate from here.
-#
-# Namespace tc_ns0 with BPF
-# Device names and addresses:
-#       veth0 IPv4: 10.1.1.100
-#	For some tests xdping run in server mode here.
-#
-
-readonly TARGET_IP="10.1.1.100"
-readonly TARGET_NS="xdp_ns0"
-
-readonly LOCAL_IP="10.1.1.200"
-
-setup()
-{
-	ip netns add $TARGET_NS
-	ip link add veth0 type veth peer name veth1
-	ip link set veth0 netns $TARGET_NS
-	ip netns exec $TARGET_NS ip addr add ${TARGET_IP}/24 dev veth0
-	ip addr add ${LOCAL_IP}/24 dev veth1
-	ip netns exec $TARGET_NS ip link set veth0 up
-	ip link set veth1 up
-}
-
-cleanup()
-{
-	set +e
-	ip netns delete $TARGET_NS 2>/dev/null
-	ip link del veth1 2>/dev/null
-	if [[ $server_pid -ne 0 ]]; then
-		kill -TERM $server_pid
-	fi
-}
-
-test()
-{
-	client_args="$1"
-	server_args="$2"
-
-	echo "Test client args '$client_args'; server args '$server_args'"
-
-	server_pid=0
-	if [[ -n "$server_args" ]]; then
-		ip netns exec $TARGET_NS ./xdping $server_args &
-		server_pid=$!
-		sleep 10
-	fi
-	./xdping $client_args $TARGET_IP
-
-	if [[ $server_pid -ne 0 ]]; then
-		kill -TERM $server_pid
-		server_pid=0
-	fi
-
-	echo "Test client args '$client_args'; server args '$server_args': PASS"
-}
-
-set -e
-
-server_pid=0
-
-trap cleanup EXIT
-
-setup
-
-for server_args in "" "-I veth0 -s -S" ; do
-	# client in skb mode
-	client_args="-I veth1 -S"
-	test "$client_args" "$server_args"
-
-	# client with count of 10 RTT measurements.
-	client_args="-I veth1 -S -c 10"
-	test "$client_args" "$server_args"
-done
-
-# Test drv mode
-test "-I veth1 -N" "-I veth0 -s -N"
-test "-I veth1 -N -c 10" "-I veth0 -s -N"
-
-echo "OK. All tests passed"
-exit 0
diff --git a/tools/testing/selftests/bpf/xdping.c b/tools/testing/selftests/bpf/xdping.c
deleted file mode 100644
index 9ed8c796645d..000000000000
--- a/tools/testing/selftests/bpf/xdping.c
+++ /dev/null
@@ -1,254 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
-
-#include <linux/bpf.h>
-#include <linux/if_link.h>
-#include <arpa/inet.h>
-#include <assert.h>
-#include <errno.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <libgen.h>
-#include <net/if.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netdb.h>
-
-#include "bpf/bpf.h"
-#include "bpf/libbpf.h"
-
-#include "xdping.h"
-#include "testing_helpers.h"
-
-static int ifindex;
-static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
-
-static void cleanup(int sig)
-{
-	bpf_xdp_detach(ifindex, xdp_flags, NULL);
-	if (sig)
-		exit(1);
-}
-
-static int get_stats(int fd, __u16 count, __u32 raddr)
-{
-	struct pinginfo pinginfo = { 0 };
-	char inaddrbuf[INET_ADDRSTRLEN];
-	struct in_addr inaddr;
-	__u16 i;
-
-	inaddr.s_addr = raddr;
-
-	printf("\nXDP RTT data:\n");
-
-	if (bpf_map_lookup_elem(fd, &raddr, &pinginfo)) {
-		perror("bpf_map_lookup elem");
-		return 1;
-	}
-
-	for (i = 0; i < count; i++) {
-		if (pinginfo.times[i] == 0)
-			break;
-
-		printf("64 bytes from %s: icmp_seq=%d ttl=64 time=%#.5f ms\n",
-		       inet_ntop(AF_INET, &inaddr, inaddrbuf,
-				 sizeof(inaddrbuf)),
-		       count + i + 1,
-		       (double)pinginfo.times[i]/1000000);
-	}
-
-	if (i < count) {
-		fprintf(stderr, "Expected %d samples, got %d.\n", count, i);
-		return 1;
-	}
-
-	bpf_map_delete_elem(fd, &raddr);
-
-	return 0;
-}
-
-static void show_usage(const char *prog)
-{
-	fprintf(stderr,
-		"usage: %s [OPTS] -I interface destination\n\n"
-		"OPTS:\n"
-		"    -c count		Stop after sending count requests\n"
-		"			(default %d, max %d)\n"
-		"    -I interface	interface name\n"
-		"    -N			Run in driver mode\n"
-		"    -s			Server mode\n"
-		"    -S			Run in skb mode\n",
-		prog, XDPING_DEFAULT_COUNT, XDPING_MAX_COUNT);
-}
-
-int main(int argc, char **argv)
-{
-	__u32 mode_flags = XDP_FLAGS_DRV_MODE | XDP_FLAGS_SKB_MODE;
-	struct addrinfo *a, hints = { .ai_family = AF_INET };
-	__u16 count = XDPING_DEFAULT_COUNT;
-	struct pinginfo pinginfo = { 0 };
-	const char *optstr = "c:I:NsS";
-	struct bpf_program *main_prog;
-	int prog_fd = -1, map_fd = -1;
-	struct sockaddr_in rin;
-	struct bpf_object *obj;
-	struct bpf_map *map;
-	char *ifname = NULL;
-	char filename[256];
-	int opt, ret = 1;
-	__u32 raddr = 0;
-	int server = 0;
-	char cmd[256];
-
-	while ((opt = getopt(argc, argv, optstr)) != -1) {
-		switch (opt) {
-		case 'c':
-			count = atoi(optarg);
-			if (count < 1 || count > XDPING_MAX_COUNT) {
-				fprintf(stderr,
-					"min count is 1, max count is %d\n",
-					XDPING_MAX_COUNT);
-				return 1;
-			}
-			break;
-		case 'I':
-			ifname = optarg;
-			ifindex = if_nametoindex(ifname);
-			if (!ifindex) {
-				fprintf(stderr, "Could not get interface %s\n",
-					ifname);
-				return 1;
-			}
-			break;
-		case 'N':
-			xdp_flags |= XDP_FLAGS_DRV_MODE;
-			break;
-		case 's':
-			/* use server program */
-			server = 1;
-			break;
-		case 'S':
-			xdp_flags |= XDP_FLAGS_SKB_MODE;
-			break;
-		default:
-			show_usage(basename(argv[0]));
-			return 1;
-		}
-	}
-
-	if (!ifname) {
-		show_usage(basename(argv[0]));
-		return 1;
-	}
-	if (!server && optind == argc) {
-		show_usage(basename(argv[0]));
-		return 1;
-	}
-
-	if ((xdp_flags & mode_flags) == mode_flags) {
-		fprintf(stderr, "-N or -S can be specified, not both.\n");
-		show_usage(basename(argv[0]));
-		return 1;
-	}
-
-	if (!server) {
-		/* Only supports IPv4; see hints initialization above. */
-		if (getaddrinfo(argv[optind], NULL, &hints, &a) || !a) {
-			fprintf(stderr, "Could not resolve %s\n", argv[optind]);
-			return 1;
-		}
-		memcpy(&rin, a->ai_addr, sizeof(rin));
-		raddr = rin.sin_addr.s_addr;
-		freeaddrinfo(a);
-	}
-
-	/* Use libbpf 1.0 API mode */
-	libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
-
-	snprintf(filename, sizeof(filename), "%s_kern.bpf.o", argv[0]);
-
-	if (bpf_prog_test_load(filename, BPF_PROG_TYPE_XDP, &obj, &prog_fd)) {
-		fprintf(stderr, "load of %s failed\n", filename);
-		return 1;
-	}
-
-	main_prog = bpf_object__find_program_by_name(obj,
-						     server ? "xdping_server" : "xdping_client");
-	if (main_prog)
-		prog_fd = bpf_program__fd(main_prog);
-	if (!main_prog || prog_fd < 0) {
-		fprintf(stderr, "could not find xdping program");
-		return 1;
-	}
-
-	map = bpf_object__next_map(obj, NULL);
-	if (map)
-		map_fd = bpf_map__fd(map);
-	if (!map || map_fd < 0) {
-		fprintf(stderr, "Could not find ping map");
-		goto done;
-	}
-
-	signal(SIGINT, cleanup);
-	signal(SIGTERM, cleanup);
-
-	printf("Setting up XDP for %s, please wait...\n", ifname);
-
-	printf("XDP setup disrupts network connectivity, hit Ctrl+C to quit\n");
-
-	if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
-		fprintf(stderr, "Link set xdp fd failed for %s\n", ifname);
-		goto done;
-	}
-
-	if (server) {
-		close(prog_fd);
-		close(map_fd);
-		printf("Running server on %s; press Ctrl+C to exit...\n",
-		       ifname);
-		do { } while (1);
-	}
-
-	/* Start xdping-ing from last regular ping reply, e.g. for a count
-	 * of 10 ICMP requests, we start xdping-ing using reply with seq number
-	 * 10.  The reason the last "real" ping RTT is much higher is that
-	 * the ping program sees the ICMP reply associated with the last
-	 * XDP-generated packet, so ping doesn't get a reply until XDP is done.
-	 */
-	pinginfo.seq = htons(count);
-	pinginfo.count = count;
-
-	if (bpf_map_update_elem(map_fd, &raddr, &pinginfo, BPF_ANY)) {
-		fprintf(stderr, "could not communicate with BPF map: %s\n",
-			strerror(errno));
-		cleanup(0);
-		goto done;
-	}
-
-	/* We need to wait for XDP setup to complete. */
-	sleep(10);
-
-	snprintf(cmd, sizeof(cmd), "ping -c %d -I %s %s",
-		 count, ifname, argv[optind]);
-
-	printf("\nNormal ping RTT data\n");
-	printf("[Ignore final RTT; it is distorted by XDP using the reply]\n");
-
-	ret = system(cmd);
-
-	if (!ret)
-		ret = get_stats(map_fd, count, raddr);
-
-	cleanup(0);
-
-done:
-	if (prog_fd > 0)
-		close(prog_fd);
-	if (map_fd > 0)
-		close(map_fd);
-
-	return ret;
-}

---
base-commit: b7fb68124aa80db90394236a9a4a6add12f4425d
change-id: 20260417-xdping-5c2ef5a63899

Best regards,
--  
Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>