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

Alexis Lothoré
2026-04-22T15:49:07Z

On Wed Apr 22, 2026 at 4:30 PM CEST, Alan Maguire wrote:
> On 17/04/2026 16:33, Alexis Lothoré (eBPF Foundation) wrote:
>> 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>
>
> Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
>
> as discussed, switching to loading xdp_dummy.bpf.o in prog_tests/btf_dump.c
> would be good too (feel free to retain the Reviewed-by: with that v2 change).

Great, I was kind of hoping to get your feedback, as you are the one who
have originally introduced the test. Thanks !

Alexis
>
> Thanks!
>
>
>> ---
>> 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>
>>

--
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering