forked from Minki/linux
86af8b4191
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>
94 lines
2.1 KiB
C
94 lines
2.1 KiB
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_helpers.h"
|
|
|
|
struct bpf_map_def SEC("maps") dropcnt = {
|
|
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(long),
|
|
.max_entries = 256,
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
SEC("xdp1")
|
|
int xdp_prog1(struct xdp_md *ctx)
|
|
{
|
|
void *data_end = (void *)(long)ctx->data_end;
|
|
void *data = (void *)(long)ctx->data;
|
|
struct ethhdr *eth = data;
|
|
int rc = XDP_DROP;
|
|
long *value;
|
|
u16 h_proto;
|
|
u64 nh_off;
|
|
u32 index;
|
|
|
|
nh_off = sizeof(*eth);
|
|
if (data + nh_off > data_end)
|
|
return rc;
|
|
|
|
h_proto = eth->h_proto;
|
|
|
|
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_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))
|
|
index = parse_ipv4(data, nh_off, data_end);
|
|
else if (h_proto == htons(ETH_P_IPV6))
|
|
index = parse_ipv6(data, nh_off, data_end);
|
|
else
|
|
index = 0;
|
|
|
|
value = bpf_map_lookup_elem(&dropcnt, &index);
|
|
if (value)
|
|
*value += 1;
|
|
|
|
return rc;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|