Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 226 insertions, 0 deletions

diff --git a/samples/bpf/xdp_fwd_user.c b/samples/bpf/xdp_fwd_user.c
new file mode 100644
index 0000000000..193b3b79b3
--- /dev/null
+++ b/samples/bpf/xdp_fwd_user.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2017-18 David Ahern <dsahern@gmail.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/bpf.h>
+#include <linux/if_link.h>
+#include <linux/limits.h>
+#include <net/if.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <libgen.h>
+
+#include <bpf/libbpf.h>
+#include <bpf/bpf.h>
+
+static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
+
+static int do_attach(int idx, int prog_fd, int map_fd, const char *name)
+{
+	int err;
+
+	err = bpf_xdp_attach(idx, prog_fd, xdp_flags, NULL);
+	if (err < 0) {
+		printf("ERROR: failed to attach program to %s\n", name);
+		return err;
+	}
+
+	/* Adding ifindex as a possible egress TX port */
+	err = bpf_map_update_elem(map_fd, &idx, &idx, 0);
+	if (err)
+		printf("ERROR: failed using device %s as TX-port\n", name);
+
+	return err;
+}
+
+static int do_detach(int ifindex, const char *ifname, const char *app_name)
+{
+	LIBBPF_OPTS(bpf_xdp_attach_opts, opts);
+	struct bpf_prog_info prog_info = {};
+	char prog_name[BPF_OBJ_NAME_LEN];
+	__u32 info_len, curr_prog_id;
+	int prog_fd;
+	int err = 1;
+
+	if (bpf_xdp_query_id(ifindex, xdp_flags, &curr_prog_id)) {
+		printf("ERROR: bpf_xdp_query_id failed (%s)\n",
+		       strerror(errno));
+		return err;
+	}
+
+	if (!curr_prog_id) {
+		printf("ERROR: flags(0x%x) xdp prog is not attached to %s\n",
+		       xdp_flags, ifname);
+		return err;
+	}
+
+	info_len = sizeof(prog_info);
+	prog_fd = bpf_prog_get_fd_by_id(curr_prog_id);
+	if (prog_fd < 0) {
+		printf("ERROR: bpf_prog_get_fd_by_id failed (%s)\n",
+		       strerror(errno));
+		return prog_fd;
+	}
+
+	err = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &info_len);
+	if (err) {
+		printf("ERROR: bpf_prog_get_info_by_fd failed (%s)\n",
+		       strerror(errno));
+		goto close_out;
+	}
+	snprintf(prog_name, sizeof(prog_name), "%s_prog", app_name);
+	prog_name[BPF_OBJ_NAME_LEN - 1] = '\0';
+
+	if (strcmp(prog_info.name, prog_name)) {
+		printf("ERROR: %s isn't attached to %s\n", app_name, ifname);
+		err = 1;
+		goto close_out;
+	}
+
+	opts.old_prog_fd = prog_fd;
+	err = bpf_xdp_detach(ifindex, xdp_flags, &opts);
+	if (err < 0)
+		printf("ERROR: failed to detach program from %s (%s)\n",
+		       ifname, strerror(errno));
+	/* TODO: Remember to cleanup map, when adding use of shared map
+	 *  bpf_map_delete_elem((map_fd, &idx);
+	 */
+close_out:
+	close(prog_fd);
+	return err;
+}
+
+static void usage(const char *prog)
+{
+	fprintf(stderr,
+		"usage: %s [OPTS] interface-list\n"
+		"\nOPTS:\n"
+		"    -d    detach program\n"
+		"    -S    use skb-mode\n"
+		"    -F    force loading prog\n"
+		"    -D    direct table lookups (skip fib rules)\n",
+		prog);
+}
+
+int main(int argc, char **argv)
+{
+	const char *prog_name = "xdp_fwd";
+	struct bpf_program *prog = NULL;
+	struct bpf_program *pos;
+	const char *sec_name;
+	int prog_fd = -1, map_fd = -1;
+	char filename[PATH_MAX];
+	struct bpf_object *obj;
+	int opt, i, idx, err;
+	int attach = 1;
+	int ret = 0;
+
+	while ((opt = getopt(argc, argv, ":dDSF")) != -1) {
+		switch (opt) {
+		case 'd':
+			attach = 0;
+			break;
+		case 'S':
+			xdp_flags |= XDP_FLAGS_SKB_MODE;
+			break;
+		case 'F':
+			xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
+			break;
+		case 'D':
+			prog_name = "xdp_fwd_direct";
+			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;
+	}
+
+	if (attach) {
+		snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+		if (access(filename, O_RDONLY) < 0) {
+			printf("error accessing file %s: %s\n",
+				filename, strerror(errno));
+			return 1;
+		}
+
+		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) {
+			printf("Does kernel support devmap lookup?\n");
+			/* If not, the error message will be:
+			 *  "cannot pass map_type 14 into func bpf_map_lookup_elem#1"
+			 */
+			return 1;
+		}
+
+		bpf_object__for_each_program(pos, obj) {
+			sec_name = bpf_program__section_name(pos);
+			if (sec_name && !strcmp(sec_name, prog_name)) {
+				prog = pos;
+				break;
+			}
+		}
+		prog_fd = bpf_program__fd(prog);
+		if (prog_fd < 0) {
+			printf("program not found: %s\n", strerror(prog_fd));
+			return 1;
+		}
+		map_fd = bpf_map__fd(bpf_object__find_map_by_name(obj,
+							"xdp_tx_ports"));
+		if (map_fd < 0) {
+			printf("map not found: %s\n", strerror(map_fd));
+			return 1;
+		}
+	}
+
+	for (i = optind; i < argc; ++i) {
+		idx = if_nametoindex(argv[i]);
+		if (!idx)
+			idx = strtoul(argv[i], NULL, 0);
+
+		if (!idx) {
+			fprintf(stderr, "Invalid arg\n");
+			return 1;
+		}
+		if (!attach) {
+			err = do_detach(idx, argv[i], prog_name);
+			if (err)
+				ret = err;
+		} else {
+			err = do_attach(idx, prog_fd, map_fd, argv[i]);
+			if (err)
+				ret = err;
+		}
+	}
+
+	return ret;
+}