samples/bpf: Remove the xdp1 and xdp2 utilities

The functionality of these utilities have been incorporated into the
xdp-bench utility in xdp-tools.

Equivalent functionality is:

xdp1 eth0
  --> xdp-bench drop -p parse-ip -l load-bytes eth0

xdp2 eth0
  --> xdp-bench drop -p swap-macs eth0

Note that there's a slight difference in behaviour of those examples: the
swap-macs operation of xdp-bench doesn't use the bpf_xdp_load_bytes()
helper to load the packet data, whereas the xdp2 utility did so
unconditionally. For the parse-ip action the use of bpf_xdp_load_bytes()
can be selected by the '-l load-bytes' switch, with the difference that the
xdp-bench utility will perform two separate calls to the helper, one to
load the ethernet header and another to load the IP header; where the xdp1
utility only performed one call always loading 60 bytes of data.
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20230824102255.1561885-5-toke@redhat.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

samples/bpf/Makefile

@@ -30,8 +30,6 @@ tprogs-y += test_cgrp2_array_pin
 tprogs-y += test_cgrp2_attach
 tprogs-y += test_cgrp2_sock
 tprogs-y += test_cgrp2_sock2
-tprogs-y += xdp1
-tprogs-y += xdp2
 tprogs-y += xdp_router_ipv4
 tprogs-y += test_current_task_under_cgroup
 tprogs-y += trace_event
@@ -83,9 +81,6 @@ test_cgrp2_array_pin-objs := test_cgrp2_array_pin.o
 test_cgrp2_attach-objs := test_cgrp2_attach.o
 test_cgrp2_sock-objs := test_cgrp2_sock.o
 test_cgrp2_sock2-objs := test_cgrp2_sock2.o
-xdp1-objs := xdp1_user.o
-# reuse xdp1 source intentionally
-xdp2-objs := xdp1_user.o
 test_current_task_under_cgroup-objs := $(CGROUP_HELPERS) \
 				       test_current_task_under_cgroup_user.o
 trace_event-objs := trace_event_user.o $(TRACE_HELPERS)
@@ -132,8 +127,6 @@ always-y += test_overhead_raw_tp.bpf.o
 always-y += test_overhead_kprobe.bpf.o
 always-y += parse_varlen.o parse_simple.o parse_ldabs.o
 always-y += test_cgrp2_tc.bpf.o
-always-y += xdp1_kern.o
-always-y += xdp2_kern.o
 always-y += test_current_task_under_cgroup.bpf.o
 always-y += trace_event_kern.o
 always-y += sampleip_kern.o

samples/bpf/xdp1_kern.c

-/* Copyright (c) 2016 PLUMgrid
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- */
-#define KBUILD_MODNAME "foo"
-#include <uapi/linux/bpf.h>
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/if_packet.h>
-#include <linux/if_vlan.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <bpf/bpf_helpers.h>
-
-struct {
-	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
-	__type(key, u32);
-	__type(value, long);
-	__uint(max_entries, 256);
-} rxcnt SEC(".maps");
-
-static int parse_ipv4(void *data, u64 nh_off, void *data_end)
-{
-	struct iphdr *iph = data + nh_off;
-
-	if (iph + 1 > data_end)
-		return 0;
-	return iph->protocol;
-}
-
-static int parse_ipv6(void *data, u64 nh_off, void *data_end)
-{
-	struct ipv6hdr *ip6h = data + nh_off;
-
-	if (ip6h + 1 > data_end)
-		return 0;
-	return ip6h->nexthdr;
-}
-
-#define XDPBUFSIZE	60
-SEC("xdp.frags")
-int xdp_prog1(struct xdp_md *ctx)
-{
-	__u8 pkt[XDPBUFSIZE] = {};
-	void *data_end = &pkt[XDPBUFSIZE-1];
-	void *data = pkt;
-	struct ethhdr *eth = data;
-	int rc = XDP_DROP;
-	long *value;
-	u16 h_proto;
-	u64 nh_off;
-	u32 ipproto;
-
-	if (bpf_xdp_load_bytes(ctx, 0, pkt, sizeof(pkt)))
-		return rc;
-
-	nh_off = sizeof(*eth);
-	if (data + nh_off > data_end)
-		return rc;
-
-	h_proto = eth->h_proto;
-
-	/* Handle VLAN tagged packet */
-	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
-		struct vlan_hdr *vhdr;
-
-		vhdr = data + nh_off;
-		nh_off += sizeof(struct vlan_hdr);
-		if (data + nh_off > data_end)
-			return rc;
-		h_proto = vhdr->h_vlan_encapsulated_proto;
-	}
-	/* Handle double VLAN tagged packet */
-	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
-		struct vlan_hdr *vhdr;
-
-		vhdr = data + nh_off;
-		nh_off += sizeof(struct vlan_hdr);
-		if (data + nh_off > data_end)
-			return rc;
-		h_proto = vhdr->h_vlan_encapsulated_proto;
-	}
-
-	if (h_proto == htons(ETH_P_IP))
-		ipproto = parse_ipv4(data, nh_off, data_end);
-	else if (h_proto == htons(ETH_P_IPV6))
-		ipproto = parse_ipv6(data, nh_off, data_end);
-	else
-		ipproto = 0;
-
-	value = bpf_map_lookup_elem(&rxcnt, &ipproto);
-	if (value)
-		*value += 1;
-
-	return rc;
-}
-
-char _license[] SEC("license") = "GPL";

samples/bpf/xdp1_user.c

-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2016 PLUMgrid
- */
-#include <linux/bpf.h>
-#include <linux/if_link.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 "bpf_util.h"
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-
-static int ifindex;
-static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
-static __u32 prog_id;
-
-static void int_exit(int sig)
-{
-	__u32 curr_prog_id = 0;
-
-	if (bpf_xdp_query_id(ifindex, xdp_flags, &curr_prog_id)) {
-		printf("bpf_xdp_query_id failed\n");
-		exit(1);
-	}
-	if (prog_id == curr_prog_id)
-		bpf_xdp_detach(ifindex, xdp_flags, NULL);
-	else if (!curr_prog_id)
-		printf("couldn't find a prog id on a given interface\n");
-	else
-		printf("program on interface changed, not removing\n");
-	exit(0);
-}
-
-/* simple per-protocol drop counter
- */
-static void poll_stats(int map_fd, int interval)
-{
-	unsigned int nr_cpus = bpf_num_possible_cpus();
-	__u64 values[nr_cpus], prev[UINT8_MAX] = { 0 };
-	int i;
-
-	while (1) {
-		__u32 key = UINT32_MAX;
-
-		sleep(interval);
-
-		while (bpf_map_get_next_key(map_fd, &key, &key) == 0) {
-			__u64 sum = 0;
-
-			assert(bpf_map_lookup_elem(map_fd, &key, values) == 0);
-			for (i = 0; i < nr_cpus; i++)
-				sum += values[i];
-			if (sum > prev[key])
-				printf("proto %u: %10llu pkt/s\n",
-				       key, (sum - prev[key]) / interval);
-			prev[key] = sum;
-		}
-	}
-}
-
-static void usage(const char *prog)
-{
-	fprintf(stderr,
-		"usage: %s [OPTS] IFACE\n\n"
-		"OPTS:\n"
-		"    -S    use skb-mode\n"
-		"    -N    enforce native mode\n"
-		"    -F    force loading prog\n",
-		prog);
-}
-
-int main(int argc, char **argv)
-{
-	struct bpf_prog_info info = {};
-	__u32 info_len = sizeof(info);
-	const char *optstr = "FSN";
-	int prog_fd, map_fd, opt;
-	struct bpf_program *prog;
-	struct bpf_object *obj;
-	struct bpf_map *map;
-	char filename[256];
-	int err;
-
-	while ((opt = getopt(argc, argv, optstr)) != -1) {
-		switch (opt) {
-		case 'S':
-			xdp_flags |= XDP_FLAGS_SKB_MODE;
-			break;
-		case 'N':
-			/* default, set below */
-			break;
-		case 'F':
-			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
-			break;
-		default:
-			usage(basename(argv[0]));
-			return 1;
-		}
-	}
-
-	if (!(xdp_flags & XDP_FLAGS_SKB_MODE))
-		xdp_flags |= XDP_FLAGS_DRV_MODE;
-
-	if (optind == argc) {
-		usage(basename(argv[0]));
-		return 1;
-	}
-
-	ifindex = if_nametoindex(argv[optind]);
-	if (!ifindex) {
-		perror("if_nametoindex");
-		return 1;
-	}
-
-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
-	obj = bpf_object__open_file(filename, NULL);
-	if (libbpf_get_error(obj))
-		return 1;
-
-	prog = bpf_object__next_program(obj, NULL);
-	bpf_program__set_type(prog, BPF_PROG_TYPE_XDP);
-
-	err = bpf_object__load(obj);
-	if (err)
-		return 1;
-
-	prog_fd = bpf_program__fd(prog);
-
-	map = bpf_object__next_map(obj, NULL);
-	if (!map) {
-		printf("finding a map in obj file failed\n");
-		return 1;
-	}
-	map_fd = bpf_map__fd(map);
-
-	if (!prog_fd) {
-		printf("bpf_prog_load_xattr: %s\n", strerror(errno));
-		return 1;
-	}
-
-	signal(SIGINT, int_exit);
-	signal(SIGTERM, int_exit);
-
-	if (bpf_xdp_attach(ifindex, prog_fd, xdp_flags, NULL) < 0) {
-		printf("link set xdp fd failed\n");
-		return 1;
-	}
-
-	err = bpf_prog_get_info_by_fd(prog_fd, &info, &info_len);
-	if (err) {
-		printf("can't get prog info - %s\n", strerror(errno));
-		return err;
-	}
-	prog_id = info.id;
-
-	poll_stats(map_fd, 1);
-
-	return 0;
-}

samples/bpf/xdp2_kern.c

-/* Copyright (c) 2016 PLUMgrid
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- */
-#define KBUILD_MODNAME "foo"
-#include <uapi/linux/bpf.h>
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/if_packet.h>
-#include <linux/if_vlan.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <bpf/bpf_helpers.h>
-
-struct {
-	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
-	__type(key, u32);
-	__type(value, long);
-	__uint(max_entries, 256);
-} rxcnt SEC(".maps");
-
-static void swap_src_dst_mac(void *data)
-{
-	unsigned short *p = data;
-	unsigned short dst[3];
-
-	dst[0] = p[0];
-	dst[1] = p[1];
-	dst[2] = p[2];
-	p[0] = p[3];
-	p[1] = p[4];
-	p[2] = p[5];
-	p[3] = dst[0];
-	p[4] = dst[1];
-	p[5] = dst[2];
-}
-
-static int parse_ipv4(void *data, u64 nh_off, void *data_end)
-{
-	struct iphdr *iph = data + nh_off;
-
-	if (iph + 1 > data_end)
-		return 0;
-	return iph->protocol;
-}
-
-static int parse_ipv6(void *data, u64 nh_off, void *data_end)
-{
-	struct ipv6hdr *ip6h = data + nh_off;
-
-	if (ip6h + 1 > data_end)
-		return 0;
-	return ip6h->nexthdr;
-}
-
-#define XDPBUFSIZE	60
-SEC("xdp.frags")
-int xdp_prog1(struct xdp_md *ctx)
-{
-	__u8 pkt[XDPBUFSIZE] = {};
-	void *data_end = &pkt[XDPBUFSIZE-1];
-	void *data = pkt;
-	struct ethhdr *eth = data;
-	int rc = XDP_DROP;
-	long *value;
-	u16 h_proto;
-	u64 nh_off;
-	u32 ipproto;
-
-	if (bpf_xdp_load_bytes(ctx, 0, pkt, sizeof(pkt)))
-		return rc;
-
-	nh_off = sizeof(*eth);
-	if (data + nh_off > data_end)
-		return rc;
-
-	h_proto = eth->h_proto;
-
-	/* Handle VLAN tagged packet */
-	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
-		struct vlan_hdr *vhdr;
-
-		vhdr = data + nh_off;
-		nh_off += sizeof(struct vlan_hdr);
-		if (data + nh_off > data_end)
-			return rc;
-		h_proto = vhdr->h_vlan_encapsulated_proto;
-	}
-	/* Handle double VLAN tagged packet */
-	if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
-		struct vlan_hdr *vhdr;
-
-		vhdr = data + nh_off;
-		nh_off += sizeof(struct vlan_hdr);
-		if (data + nh_off > data_end)
-			return rc;
-		h_proto = vhdr->h_vlan_encapsulated_proto;
-	}
-
-	if (h_proto == htons(ETH_P_IP))
-		ipproto = parse_ipv4(data, nh_off, data_end);
-	else if (h_proto == htons(ETH_P_IPV6))
-		ipproto = parse_ipv6(data, nh_off, data_end);
-	else
-		ipproto = 0;
-
-	value = bpf_map_lookup_elem(&rxcnt, &ipproto);
-	if (value)
-		*value += 1;
-
-	if (ipproto == IPPROTO_UDP) {
-		swap_src_dst_mac(data);
-
-		if (bpf_xdp_store_bytes(ctx, 0, pkt, sizeof(pkt)))
-			return rc;
-
-		rc = XDP_TX;
-	}
-
-	return rc;
-}
-
-char _license[] SEC("license") = "GPL";