From patchwork Tue Apr 13 09:41:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hangbin Liu X-Patchwork-Id: 12199837 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D218BC433ED for ; Tue, 13 Apr 2021 09:42:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2058613AB for ; Tue, 13 Apr 2021 09:42:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231140AbhDMJmd (ORCPT ); Tue, 13 Apr 2021 05:42:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52128 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230386AbhDMJmY (ORCPT ); Tue, 13 Apr 2021 05:42:24 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9CA42C061574; Tue, 13 Apr 2021 02:42:05 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id u11so4520722pjr.0; Tue, 13 Apr 2021 02:42:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=rbMZ3uTowb0oEigO6WQ5nMAUIC/eZ22+oCNyQT8Gs/A=; b=MSLFgc0JQH1qMaPiXR81OJVetoVgZymLulMj/nqP2Ocj0l/w43jqTxdduQdamJ7G3X /82p6tyuVVlQqBWCO2z+vfJyBAdl1XmVa0IersxfF5vZiQFFssPWZSGQtCmlNPnLWlyq fWx7MGJIj7c6RbF1yrGfW+fIXmTwSlrBx69ArdC2vOyl9egIzhS8rCLKookl/l4avo2f NXypD+BeOGj3XSsLwlrxd8XWuLWG0GnnZONJkIY3rMRAE9w0Mi1/O5GBsfrDNLhQH4aN 11zZNdGg8drzAv3+lspcXhZTChM5vved9JCWuP+JiakmaDgJCKmiqyAgdx0wUexEtlgQ uuUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=rbMZ3uTowb0oEigO6WQ5nMAUIC/eZ22+oCNyQT8Gs/A=; b=qQbLP1ES/xEu4ZYayGWgJM8lGgRi5SbXqtJTl6pM4oKHfcaJMWi4ggHtksLnVDuSrQ Z7uS+8pwBH5znTm1llMm41H4eQ1a3qs8rbu0O9lpmXOrPA8Xia96wKuNMxWFkl1knqg7 L2yFJ+KVVaCfdMYpvOx+dG1ICsJJW7dcJ04c3ZzBIrR5HFky/Idnm7MFNMoGdlqLziT9 WHTx/vx4/dthXyyaInYYvcKQOoCLmWu/LY0sRGakltyis5O3fBIRXRGVdrwMeueAWBAw hOOmvBlSQI+FxrzM0Uczcwiwq/Jgwgr94GEQtGGB9D34ZRutQUMj2ziJVxW2DOZKMM1L YB+Q== X-Gm-Message-State: AOAM5324gQ/Qo+iAUAbqpIa26UKDkHnPBzeDk4Y6dcdDyDXhXZE5Pcvu rhDDe+p2D4NjnoRTlJAz6fBBpp8LzbjQWA== X-Google-Smtp-Source: ABdhPJzEJrAdCP6tLxdFIcGsryYanZohVxjc6GQMbfxMWWjp3EmrXtv4yzXFUc2lTWPChsPbsX17og== X-Received: by 2002:a17:90a:4406:: with SMTP id s6mr3827989pjg.93.1618306924930; Tue, 13 Apr 2021 02:42:04 -0700 (PDT) Received: from Leo-laptop-t470s.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id y193sm12442732pfc.72.2021.04.13.02.42.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Apr 2021 02:42:04 -0700 (PDT) From: Hangbin Liu To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Jiri Benc , Jesper Dangaard Brouer , Eelco Chaudron , ast@kernel.org, Daniel Borkmann , Lorenzo Bianconi , David Ahern , Andrii Nakryiko , Alexei Starovoitov , John Fastabend , Maciej Fijalkowski , =?utf-8?b?QmrDtnJuIFQ=?= =?utf-8?b?w7ZwZWw=?= , Hangbin Liu Subject: [PATCHv5 bpf-next 3/4] sample/bpf: add xdp_redirect_map_multi for redirect_map broadcast test Date: Tue, 13 Apr 2021 17:41:32 +0800 Message-Id: <20210413094133.3966678-4-liuhangbin@gmail.com> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210413094133.3966678-1-liuhangbin@gmail.com> References: <20210413094133.3966678-1-liuhangbin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net This is a sample for xdp redirect broadcast. In the sample we could forward all packets between given interfaces. There is also an option -X that could enable 2nd xdp_prog on egress interface. Signed-off-by: Hangbin Liu --- samples/bpf/Makefile | 3 + samples/bpf/xdp_redirect_map_multi_kern.c | 87 +++++++ samples/bpf/xdp_redirect_map_multi_user.c | 302 ++++++++++++++++++++++ 3 files changed, 392 insertions(+) create mode 100644 samples/bpf/xdp_redirect_map_multi_kern.c create mode 100644 samples/bpf/xdp_redirect_map_multi_user.c diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 45ceca4e2c70..520434ea966f 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -41,6 +41,7 @@ tprogs-y += test_map_in_map tprogs-y += per_socket_stats_example tprogs-y += xdp_redirect tprogs-y += xdp_redirect_map +tprogs-y += xdp_redirect_map_multi tprogs-y += xdp_redirect_cpu tprogs-y += xdp_monitor tprogs-y += xdp_rxq_info @@ -99,6 +100,7 @@ test_map_in_map-objs := test_map_in_map_user.o per_socket_stats_example-objs := cookie_uid_helper_example.o xdp_redirect-objs := xdp_redirect_user.o xdp_redirect_map-objs := xdp_redirect_map_user.o +xdp_redirect_map_multi-objs := xdp_redirect_map_multi_user.o xdp_redirect_cpu-objs := xdp_redirect_cpu_user.o xdp_monitor-objs := xdp_monitor_user.o xdp_rxq_info-objs := xdp_rxq_info_user.o @@ -160,6 +162,7 @@ always-y += tcp_tos_reflect_kern.o always-y += tcp_dumpstats_kern.o always-y += xdp_redirect_kern.o always-y += xdp_redirect_map_kern.o +always-y += xdp_redirect_map_multi_kern.o always-y += xdp_redirect_cpu_kern.o always-y += xdp_monitor_kern.o always-y += xdp_rxq_info_kern.o diff --git a/samples/bpf/xdp_redirect_map_multi_kern.c b/samples/bpf/xdp_redirect_map_multi_kern.c new file mode 100644 index 000000000000..e6be70225ee1 --- /dev/null +++ b/samples/bpf/xdp_redirect_map_multi_kern.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0 +#define KBUILD_MODNAME "foo" +#include +#include +#include +#include +#include +#include + +struct { + __uint(type, BPF_MAP_TYPE_DEVMAP_HASH); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(int)); + __uint(max_entries, 32); +} forward_map_general SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_DEVMAP_HASH); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(struct bpf_devmap_val)); + __uint(max_entries, 32); +} forward_map_native SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); + __type(key, u32); + __type(value, long); + __uint(max_entries, 1); +} rxcnt SEC(".maps"); + +/* map to store egress interfaces mac addresses, set the + * max_entries to 1 and extend it in user sapce prog. + */ +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, u32); + __type(value, __be64); + __uint(max_entries, 1); +} mac_map SEC(".maps"); + +static int xdp_redirect_map(struct xdp_md *ctx, void *forward_map) +{ + long *value; + u32 key = 0; + + /* count packet in global counter */ + value = bpf_map_lookup_elem(&rxcnt, &key); + if (value) + *value += 1; + + return bpf_redirect_map(forward_map, key, BPF_F_REDIR_MASK); +} + +SEC("xdp_redirect_general") +int xdp_redirect_map_general(struct xdp_md *ctx) +{ + return xdp_redirect_map(ctx, &forward_map_general); +} + +SEC("xdp_redirect_native") +int xdp_redirect_map_native(struct xdp_md *ctx) +{ + return xdp_redirect_map(ctx, &forward_map_native); +} + +SEC("xdp_devmap/map_prog") +int xdp_devmap_prog(struct xdp_md *ctx) +{ + void *data_end = (void *)(long)ctx->data_end; + void *data = (void *)(long)ctx->data; + u32 key = ctx->egress_ifindex; + struct ethhdr *eth = data; + __be64 *mac; + u64 nh_off; + + nh_off = sizeof(*eth); + if (data + nh_off > data_end) + return XDP_DROP; + + mac = bpf_map_lookup_elem(&mac_map, &key); + if (mac) + __builtin_memcpy(eth->h_source, mac, ETH_ALEN); + + return XDP_PASS; +} + +char _license[] SEC("license") = "GPL"; diff --git a/samples/bpf/xdp_redirect_map_multi_user.c b/samples/bpf/xdp_redirect_map_multi_user.c new file mode 100644 index 000000000000..84cdbbed20b7 --- /dev/null +++ b/samples/bpf/xdp_redirect_map_multi_user.c @@ -0,0 +1,302 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "bpf_util.h" +#include +#include + +#define MAX_IFACE_NUM 32 + +static __u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST; +static int ifaces[MAX_IFACE_NUM] = {}; +static int rxcnt_map_fd; + +static void int_exit(int sig) +{ + __u32 prog_id = 0; + int i; + + for (i = 0; ifaces[i] > 0; i++) { + if (bpf_get_link_xdp_id(ifaces[i], &prog_id, xdp_flags)) { + printf("bpf_get_link_xdp_id failed\n"); + exit(1); + } + if (prog_id) + bpf_set_link_xdp_fd(ifaces[i], -1, xdp_flags); + } + + exit(0); +} + +static void poll_stats(int interval) +{ + unsigned int nr_cpus = bpf_num_possible_cpus(); + __u64 values[nr_cpus], prev[nr_cpus]; + + memset(prev, 0, sizeof(prev)); + + while (1) { + __u64 sum = 0; + __u32 key = 0; + int i; + + sleep(interval); + assert(bpf_map_lookup_elem(rxcnt_map_fd, &key, values) == 0); + for (i = 0; i < nr_cpus; i++) + sum += (values[i] - prev[i]); + if (sum) + printf("Forwarding %10llu pkt/s\n", sum / interval); + memcpy(prev, values, sizeof(values)); + } +} + +static int get_mac_addr(unsigned int ifindex, void *mac_addr) +{ + char ifname[IF_NAMESIZE]; + struct ifreq ifr; + int fd, ret = -1; + + fd = socket(AF_INET, SOCK_DGRAM, 0); + if (fd < 0) + return ret; + + if (!if_indextoname(ifindex, ifname)) + goto err_out; + + strcpy(ifr.ifr_name, ifname); + + if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) + goto err_out; + + memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char)); + ret = 0; + +err_out: + close(fd); + return ret; +} + +static int update_mac_map(struct bpf_object *obj) +{ + int i, ret = -1, mac_map_fd; + unsigned char mac_addr[6]; + unsigned int ifindex; + + mac_map_fd = bpf_object__find_map_fd_by_name(obj, "mac_map"); + if (mac_map_fd < 0) { + printf("find mac map fd failed\n"); + return ret; + } + + for (i = 0; ifaces[i] > 0; i++) { + ifindex = ifaces[i]; + + ret = get_mac_addr(ifindex, mac_addr); + if (ret < 0) { + printf("get interface %d mac failed\n", ifindex); + return ret; + } + + ret = bpf_map_update_elem(mac_map_fd, &ifindex, mac_addr, 0); + if (ret) { + perror("bpf_update_elem mac_map_fd"); + return ret; + } + } + + return 0; +} + +static void usage(const char *prog) +{ + fprintf(stderr, + "usage: %s [OPTS] ...\n" + "OPTS:\n" + " -S use skb-mode\n" + " -N enforce native mode\n" + " -F force loading prog\n" + " -X load xdp program on egress\n", + prog); +} + +int main(int argc, char **argv) +{ + int i, ret, opt, forward_map_fd, max_ifindex = 0; + struct bpf_program *ingress_prog, *egress_prog; + int ingress_prog_fd, egress_prog_fd = 0; + struct bpf_devmap_val devmap_val; + bool attach_egress_prog = false; + char ifname[IF_NAMESIZE]; + struct bpf_map *mac_map; + struct bpf_object *obj; + unsigned int ifindex; + char filename[256]; + + while ((opt = getopt(argc, argv, "SNFX")) != -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; + case 'X': + attach_egress_prog = true; + break; + default: + usage(basename(argv[0])); + return 1; + } + } + + if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) { + xdp_flags |= XDP_FLAGS_DRV_MODE; + } else if (attach_egress_prog) { + printf("Load xdp program on egress with SKB mode not supported yet\n"); + return 1; + } + + if (optind == argc) { + printf("usage: %s ...\n", argv[0]); + return 1; + } + + printf("Get interfaces"); + for (i = 0; i < MAX_IFACE_NUM && argv[optind + i]; i++) { + ifaces[i] = if_nametoindex(argv[optind + i]); + if (!ifaces[i]) + ifaces[i] = strtoul(argv[optind + i], NULL, 0); + if (!if_indextoname(ifaces[i], ifname)) { + perror("Invalid interface name or i"); + return 1; + } + + /* Find the largest index number */ + if (ifaces[i] > max_ifindex) + max_ifindex = ifaces[i]; + + printf(" %d", ifaces[i]); + } + printf("\n"); + + snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); + + obj = bpf_object__open(filename); + if (libbpf_get_error(obj)) { + printf("ERROR: opening BPF object file failed\n"); + obj = NULL; + goto err_out; + } + + /* Reset the map size to max ifindex + 1 */ + if (attach_egress_prog) { + mac_map = bpf_object__find_map_by_name(obj, "mac_map"); + ret = bpf_map__resize(mac_map, max_ifindex + 1); + if (ret < 0) { + printf("ERROR: reset mac map size failed\n"); + goto err_out; + } + } + + /* load BPF program */ + if (bpf_object__load(obj)) { + printf("ERROR: loading BPF object file failed\n"); + goto err_out; + } + + if (xdp_flags & XDP_FLAGS_SKB_MODE) { + ingress_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_general"); + forward_map_fd = bpf_object__find_map_fd_by_name(obj, "forward_map_general"); + } else { + ingress_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_native"); + forward_map_fd = bpf_object__find_map_fd_by_name(obj, "forward_map_native"); + } + if (!ingress_prog || forward_map_fd < 0) { + printf("finding ingress_prog/forward_map in obj file failed\n"); + goto err_out; + } + + ingress_prog_fd = bpf_program__fd(ingress_prog); + if (ingress_prog_fd < 0) { + printf("find ingress_prog fd failed\n"); + goto err_out; + } + + rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt"); + if (rxcnt_map_fd < 0) { + printf("bpf_object__find_map_fd_by_name failed\n"); + goto err_out; + } + + if (attach_egress_prog) { + /* Update mac_map with all egress interfaces' mac addr */ + if (update_mac_map(obj) < 0) { + printf("Error: update mac map failed"); + goto err_out; + } + + /* Find egress prog fd */ + egress_prog = bpf_object__find_program_by_name(obj, "xdp_devmap_prog"); + if (!egress_prog) { + printf("finding egress_prog in obj file failed\n"); + goto err_out; + } + egress_prog_fd = bpf_program__fd(egress_prog); + if (egress_prog_fd < 0) { + printf("find egress_prog fd failed\n"); + goto err_out; + } + } + + /* Remove attached program when program is interrupted or killed */ + signal(SIGINT, int_exit); + signal(SIGTERM, int_exit); + + /* Init forward multicast groups */ + for (i = 0; ifaces[i] > 0; i++) { + ifindex = ifaces[i]; + + /* bind prog_fd to each interface */ + ret = bpf_set_link_xdp_fd(ifindex, ingress_prog_fd, xdp_flags); + if (ret) { + printf("Set xdp fd failed on %d\n", ifindex); + goto err_out; + } + + /* Add all the interfaces to forward group and attach + * egress devmap programe if exist + */ + devmap_val.ifindex = ifindex; + devmap_val.bpf_prog.fd = egress_prog_fd; + ret = bpf_map_update_elem(forward_map_fd, &ifindex, &devmap_val, 0); + if (ret) { + perror("bpf_map_update_elem forward_map"); + goto err_out; + } + } + + poll_stats(2); + + return 0; + +err_out: + return 1; +}