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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (c) 2019 Facebook
*
* 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.
*
* Include file for sample Host Bandwidth Manager (HBM) BPF programs
*/
#define KBUILD_MODNAME "foo"
#include <stddef.h>
#include <stdbool.h>
#include <uapi/linux/bpf.h>
#include <uapi/linux/if_ether.h>
#include <uapi/linux/if_packet.h>
#include <uapi/linux/ip.h>
#include <uapi/linux/ipv6.h>
#include <uapi/linux/in.h>
#include <uapi/linux/tcp.h>
#include <uapi/linux/filter.h>
#include <uapi/linux/pkt_cls.h>
#include <net/ipv6.h>
#include <net/inet_ecn.h>
#include "bpf_endian.h"
#include "bpf_helpers.h"
#include "hbm.h"
#define DROP_PKT 0
#define ALLOW_PKT 1
#define TCP_ECN_OK 1
#define HBM_DEBUG 0 // Set to 1 to enable debugging
#if HBM_DEBUG
#define bpf_printk(fmt, ...) \
({ \
char ____fmt[] = fmt; \
bpf_trace_printk(____fmt, sizeof(____fmt), \
##__VA_ARGS__); \
})
#else
#define bpf_printk(fmt, ...)
#endif
#define INITIAL_CREDIT_PACKETS 100
#define MAX_BYTES_PER_PACKET 1500
#define MARK_THRESH (40 * MAX_BYTES_PER_PACKET)
#define DROP_THRESH (80 * 5 * MAX_BYTES_PER_PACKET)
#define LARGE_PKT_DROP_THRESH (DROP_THRESH - (15 * MAX_BYTES_PER_PACKET))
#define MARK_REGION_SIZE (LARGE_PKT_DROP_THRESH - MARK_THRESH)
#define LARGE_PKT_THRESH 120
#define MAX_CREDIT (100 * MAX_BYTES_PER_PACKET)
#define INIT_CREDIT (INITIAL_CREDIT_PACKETS * MAX_BYTES_PER_PACKET)
// rate in bytes per ns << 20
#define CREDIT_PER_NS(delta, rate) ((((u64)(delta)) * (rate)) >> 20)
struct bpf_map_def SEC("maps") queue_state = {
.type = BPF_MAP_TYPE_CGROUP_STORAGE,
.key_size = sizeof(struct bpf_cgroup_storage_key),
.value_size = sizeof(struct hbm_vqueue),
};
BPF_ANNOTATE_KV_PAIR(queue_state, struct bpf_cgroup_storage_key,
struct hbm_vqueue);
struct bpf_map_def SEC("maps") queue_stats = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(u32),
.value_size = sizeof(struct hbm_queue_stats),
.max_entries = 1,
};
BPF_ANNOTATE_KV_PAIR(queue_stats, int, struct hbm_queue_stats);
struct hbm_pkt_info {
bool is_ip;
bool is_tcp;
short ecn;
};
static __always_inline void hbm_get_pkt_info(struct __sk_buff *skb,
struct hbm_pkt_info *pkti)
{
struct iphdr iph;
struct ipv6hdr *ip6h;
bpf_skb_load_bytes(skb, 0, &iph, 12);
if (iph.version == 6) {
ip6h = (struct ipv6hdr *)&iph;
pkti->is_ip = true;
pkti->is_tcp = (ip6h->nexthdr == 6);
pkti->ecn = (ip6h->flow_lbl[0] >> 4) & INET_ECN_MASK;
} else if (iph.version == 4) {
pkti->is_ip = true;
pkti->is_tcp = (iph.protocol == 6);
pkti->ecn = iph.tos & INET_ECN_MASK;
} else {
pkti->is_ip = false;
pkti->is_tcp = false;
pkti->ecn = 0;
}
}
static __always_inline void hbm_init_vqueue(struct hbm_vqueue *qdp, int rate)
{
bpf_printk("Initializing queue_state, rate:%d\n", rate * 128);
qdp->lasttime = bpf_ktime_get_ns();
qdp->credit = INIT_CREDIT;
qdp->rate = rate * 128;
}
static __always_inline void hbm_update_stats(struct hbm_queue_stats *qsp,
int len,
unsigned long long curtime,
bool congestion_flag,
bool drop_flag)
{
if (qsp != NULL) {
// Following is needed for work conserving
__sync_add_and_fetch(&(qsp->bytes_total), len);
if (qsp->stats) {
// Optionally update statistics
if (qsp->firstPacketTime == 0)
qsp->firstPacketTime = curtime;
qsp->lastPacketTime = curtime;
__sync_add_and_fetch(&(qsp->pkts_total), 1);
if (congestion_flag || drop_flag) {
__sync_add_and_fetch(&(qsp->pkts_marked), 1);
__sync_add_and_fetch(&(qsp->bytes_marked), len);
}
if (drop_flag) {
__sync_add_and_fetch(&(qsp->pkts_dropped), 1);
__sync_add_and_fetch(&(qsp->bytes_dropped),
len);
}
}
}
}
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