Add sample for adding simple drop program to link
Add a sample program that only drops packets at the BPF_PROG_TYPE_XDP_RX hook of a link. With the drop-only program, observed single core rate is ~20Mpps. Other tests were run, for instance without the dropcnt increment or without reading from the packet header, the packet rate was mostly unchanged. $ perf record -a samples/bpf/xdp1 $(</sys/class/net/eth0/ifindex) proto 17: 20403027 drops/s ./pktgen_sample03_burst_single_flow.sh -i $DEV -d $IP -m $MAC -t 4 Running... ctrl^C to stop Device: eth4@0 Result: OK: 11791017(c11788327+d2689) usec, 59622913 (60byte,0frags) 5056638pps 2427Mb/sec (2427186240bps) errors: 0 Device: eth4@1 Result: OK: 11791012(c11787906+d3106) usec, 60526944 (60byte,0frags) 5133311pps 2463Mb/sec (2463989280bps) errors: 0 Device: eth4@2 Result: OK: 11791019(c11788249+d2769) usec, 59868091 (60byte,0frags) 5077431pps 2437Mb/sec (2437166880bps) errors: 0 Device: eth4@3 Result: OK: 11795039(c11792403+d2636) usec, 59483181 (60byte,0frags) 5043067pps 2420Mb/sec (2420672160bps) errors: 0 perf report --no-children: 26.05% ksoftirqd/0 [mlx4_en] [k] mlx4_en_process_rx_cq 17.84% ksoftirqd/0 [mlx4_en] [k] mlx4_en_alloc_frags 5.52% ksoftirqd/0 [mlx4_en] [k] mlx4_en_free_frag 4.90% swapper [kernel.vmlinux] [k] poll_idle 4.14% ksoftirqd/0 [kernel.vmlinux] [k] get_page_from_freelist 2.78% ksoftirqd/0 [kernel.vmlinux] [k] __free_pages_ok 2.57% ksoftirqd/0 [kernel.vmlinux] [k] bpf_map_lookup_elem 2.51% swapper [mlx4_en] [k] mlx4_en_process_rx_cq 1.94% ksoftirqd/0 [kernel.vmlinux] [k] percpu_array_map_lookup_elem 1.45% swapper [mlx4_en] [k] mlx4_en_alloc_frags 1.35% ksoftirqd/0 [kernel.vmlinux] [k] free_one_page 1.33% swapper [kernel.vmlinux] [k] intel_idle 1.04% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5c5 0.96% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c58d 0.93% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6ee 0.92% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6b9 0.89% ksoftirqd/0 [kernel.vmlinux] [k] __alloc_pages_nodemask 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c686 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5d5 0.78% ksoftirqd/0 [mlx4_en] [k] mlx4_alloc_pages.isra.23 0.77% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5b4 0.77% ksoftirqd/0 [kernel.vmlinux] [k] net_rx_action machine specs: receiver - Intel E5-1630 v3 @ 3.70GHz sender - Intel E5645 @ 2.40GHz Mellanox ConnectX-3 @40G Signed-off-by: Brenden Blanco <bblanco@plumgrid.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brenden Blanco
David S. Miller
parent
47a38e1550
commit
86af8b4191
@ -21,6 +21,7 @@ hostprogs-y += spintest
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hostprogs-y += map_perf_test
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hostprogs-y += test_overhead
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hostprogs-y += test_cgrp2_array_pin
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hostprogs-y += xdp1
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test_verifier-objs := test_verifier.o libbpf.o
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test_maps-objs := test_maps.o libbpf.o
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@ -42,6 +43,7 @@ spintest-objs := bpf_load.o libbpf.o spintest_user.o
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map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o
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test_overhead-objs := bpf_load.o libbpf.o test_overhead_user.o
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test_cgrp2_array_pin-objs := libbpf.o test_cgrp2_array_pin.o
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xdp1-objs := bpf_load.o libbpf.o xdp1_user.o
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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@ -64,6 +66,7 @@ always += test_overhead_tp_kern.o
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always += test_overhead_kprobe_kern.o
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always += parse_varlen.o parse_simple.o parse_ldabs.o
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always += test_cgrp2_tc_kern.o
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always += xdp1_kern.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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@ -84,6 +87,7 @@ HOSTLOADLIBES_offwaketime += -lelf
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HOSTLOADLIBES_spintest += -lelf
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HOSTLOADLIBES_map_perf_test += -lelf -lrt
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HOSTLOADLIBES_test_overhead += -lelf -lrt
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HOSTLOADLIBES_xdp1 += -lelf
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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@ -50,6 +50,7 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
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bool is_kprobe = strncmp(event, "kprobe/", 7) == 0;
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bool is_kretprobe = strncmp(event, "kretprobe/", 10) == 0;
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bool is_tracepoint = strncmp(event, "tracepoint/", 11) == 0;
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bool is_xdp = strncmp(event, "xdp", 3) == 0;
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enum bpf_prog_type prog_type;
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char buf[256];
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int fd, efd, err, id;
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@ -66,6 +67,8 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
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prog_type = BPF_PROG_TYPE_KPROBE;
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} else if (is_tracepoint) {
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prog_type = BPF_PROG_TYPE_TRACEPOINT;
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} else if (is_xdp) {
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prog_type = BPF_PROG_TYPE_XDP;
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} else {
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printf("Unknown event '%s'\n", event);
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return -1;
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@ -79,6 +82,9 @@ static int load_and_attach(const char *event, struct bpf_insn *prog, int size)
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prog_fd[prog_cnt++] = fd;
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if (is_xdp)
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return 0;
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if (is_socket) {
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event += 6;
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if (*event != '/')
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@ -319,6 +325,7 @@ int load_bpf_file(char *path)
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if (memcmp(shname_prog, "kprobe/", 7) == 0 ||
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memcmp(shname_prog, "kretprobe/", 10) == 0 ||
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memcmp(shname_prog, "tracepoint/", 11) == 0 ||
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memcmp(shname_prog, "xdp", 3) == 0 ||
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memcmp(shname_prog, "socket", 6) == 0)
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load_and_attach(shname_prog, insns, data_prog->d_size);
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}
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@ -336,6 +343,7 @@ int load_bpf_file(char *path)
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if (memcmp(shname, "kprobe/", 7) == 0 ||
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memcmp(shname, "kretprobe/", 10) == 0 ||
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memcmp(shname, "tracepoint/", 11) == 0 ||
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memcmp(shname, "xdp", 3) == 0 ||
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memcmp(shname, "socket", 6) == 0)
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load_and_attach(shname, data->d_buf, data->d_size);
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}
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93
samples/bpf/xdp1_kern.c
Normal file
93
samples/bpf/xdp1_kern.c
Normal file
@ -0,0 +1,93 @@
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/* Copyright (c) 2016 PLUMgrid
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#define KBUILD_MODNAME "foo"
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#include <uapi/linux/bpf.h>
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#include <linux/in.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include "bpf_helpers.h"
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struct bpf_map_def SEC("maps") dropcnt = {
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.type = BPF_MAP_TYPE_PERCPU_ARRAY,
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.key_size = sizeof(u32),
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.value_size = sizeof(long),
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.max_entries = 256,
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};
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static int parse_ipv4(void *data, u64 nh_off, void *data_end)
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{
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struct iphdr *iph = data + nh_off;
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if (iph + 1 > data_end)
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return 0;
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return iph->protocol;
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}
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static int parse_ipv6(void *data, u64 nh_off, void *data_end)
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{
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struct ipv6hdr *ip6h = data + nh_off;
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if (ip6h + 1 > data_end)
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return 0;
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return ip6h->nexthdr;
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}
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SEC("xdp1")
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int xdp_prog1(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct ethhdr *eth = data;
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int rc = XDP_DROP;
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long *value;
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u16 h_proto;
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u64 nh_off;
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u32 index;
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nh_off = sizeof(*eth);
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if (data + nh_off > data_end)
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return rc;
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h_proto = eth->h_proto;
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if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
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struct vlan_hdr *vhdr;
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vhdr = data + nh_off;
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nh_off += sizeof(struct vlan_hdr);
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if (data + nh_off > data_end)
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return rc;
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h_proto = vhdr->h_vlan_encapsulated_proto;
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}
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if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
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struct vlan_hdr *vhdr;
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vhdr = data + nh_off;
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nh_off += sizeof(struct vlan_hdr);
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if (data + nh_off > data_end)
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return rc;
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h_proto = vhdr->h_vlan_encapsulated_proto;
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}
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if (h_proto == htons(ETH_P_IP))
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index = parse_ipv4(data, nh_off, data_end);
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else if (h_proto == htons(ETH_P_IPV6))
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index = parse_ipv6(data, nh_off, data_end);
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else
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index = 0;
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value = bpf_map_lookup_elem(&dropcnt, &index);
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if (value)
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*value += 1;
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return rc;
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}
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char _license[] SEC("license") = "GPL";
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181
samples/bpf/xdp1_user.c
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181
samples/bpf/xdp1_user.c
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@ -0,0 +1,181 @@
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/* Copyright (c) 2016 PLUMgrid
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/bpf.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include "bpf_load.h"
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#include "libbpf.h"
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static int set_link_xdp_fd(int ifindex, int fd)
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{
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struct sockaddr_nl sa;
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int sock, seq = 0, len, ret = -1;
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char buf[4096];
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struct nlattr *nla, *nla_xdp;
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struct {
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struct nlmsghdr nh;
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struct ifinfomsg ifinfo;
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char attrbuf[64];
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} req;
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struct nlmsghdr *nh;
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struct nlmsgerr *err;
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memset(&sa, 0, sizeof(sa));
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sa.nl_family = AF_NETLINK;
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sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (sock < 0) {
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printf("open netlink socket: %s\n", strerror(errno));
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return -1;
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}
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if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
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printf("bind to netlink: %s\n", strerror(errno));
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goto cleanup;
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}
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memset(&req, 0, sizeof(req));
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req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
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req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
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req.nh.nlmsg_type = RTM_SETLINK;
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req.nh.nlmsg_pid = 0;
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req.nh.nlmsg_seq = ++seq;
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req.ifinfo.ifi_family = AF_UNSPEC;
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req.ifinfo.ifi_index = ifindex;
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nla = (struct nlattr *)(((char *)&req)
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+ NLMSG_ALIGN(req.nh.nlmsg_len));
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nla->nla_type = NLA_F_NESTED | 43/*IFLA_XDP*/;
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nla_xdp = (struct nlattr *)((char *)nla + NLA_HDRLEN);
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nla_xdp->nla_type = 1/*IFLA_XDP_FD*/;
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nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
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memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
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nla->nla_len = NLA_HDRLEN + nla_xdp->nla_len;
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req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
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if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
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printf("send to netlink: %s\n", strerror(errno));
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goto cleanup;
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}
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len = recv(sock, buf, sizeof(buf), 0);
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if (len < 0) {
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printf("recv from netlink: %s\n", strerror(errno));
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goto cleanup;
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}
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for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
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nh = NLMSG_NEXT(nh, len)) {
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if (nh->nlmsg_pid != getpid()) {
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printf("Wrong pid %d, expected %d\n",
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nh->nlmsg_pid, getpid());
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goto cleanup;
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}
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if (nh->nlmsg_seq != seq) {
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printf("Wrong seq %d, expected %d\n",
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nh->nlmsg_seq, seq);
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goto cleanup;
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}
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switch (nh->nlmsg_type) {
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case NLMSG_ERROR:
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err = (struct nlmsgerr *)NLMSG_DATA(nh);
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if (!err->error)
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continue;
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printf("nlmsg error %s\n", strerror(-err->error));
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goto cleanup;
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case NLMSG_DONE:
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break;
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}
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}
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ret = 0;
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cleanup:
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close(sock);
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return ret;
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}
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static int ifindex;
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static void int_exit(int sig)
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{
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set_link_xdp_fd(ifindex, -1);
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exit(0);
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}
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/* simple per-protocol drop counter
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*/
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static void poll_stats(int interval)
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{
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unsigned int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
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const unsigned int nr_keys = 256;
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__u64 values[nr_cpus], prev[nr_keys][nr_cpus];
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__u32 key;
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int i;
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memset(prev, 0, sizeof(prev));
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while (1) {
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sleep(interval);
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for (key = 0; key < nr_keys; key++) {
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__u64 sum = 0;
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assert(bpf_lookup_elem(map_fd[0], &key, values) == 0);
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for (i = 0; i < nr_cpus; i++)
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sum += (values[i] - prev[key][i]);
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if (sum)
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printf("proto %u: %10llu pkt/s\n",
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key, sum / interval);
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memcpy(prev[key], values, sizeof(values));
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}
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}
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}
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int main(int ac, char **argv)
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{
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char filename[256];
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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if (ac != 2) {
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printf("usage: %s IFINDEX\n", argv[0]);
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return 1;
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}
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ifindex = strtoul(argv[1], NULL, 0);
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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if (!prog_fd[0]) {
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printf("load_bpf_file: %s\n", strerror(errno));
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return 1;
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}
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signal(SIGINT, int_exit);
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if (set_link_xdp_fd(ifindex, prog_fd[0]) < 0) {
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printf("link set xdp fd failed\n");
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return 1;
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}
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poll_stats(2);
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return 0;
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}
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