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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_PKT_SCHED_H
#define __NET_PKT_SCHED_H

#include <linux/jiffies.h>
#include <linux/ktime.h>
#include <linux/if_vlan.h>
#include <linux/netdevice.h>
#include <net/sch_generic.h>
#include <net/net_namespace.h>
#include <uapi/linux/pkt_sched.h>

#define DEFAULT_TX_QUEUE_LEN	1000

struct qdisc_walker {
	int	stop;
	int	skip;
	int	count;
	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
};

#define QDISC_ALIGNTO		64
#define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))

static inline void *qdisc_priv(struct Qdisc *q)
{
	return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
}

/* 
   Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
   
   Normal IP packet size ~ 512byte, hence:

   0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
   10Mbit ethernet.

   10msec resolution -> <50Kbit/sec.
   
   The result: [34]86 is not good choice for QoS router :-(

   The things are not so bad, because we may use artificial
   clock evaluated by integration of network data flow
   in the most critical places.
 */

typedef u64	psched_time_t;
typedef long	psched_tdiff_t;

/* Avoid doing 64 bit divide */
#define PSCHED_SHIFT			6
#define PSCHED_TICKS2NS(x)		((s64)(x) << PSCHED_SHIFT)
#define PSCHED_NS2TICKS(x)		((x) >> PSCHED_SHIFT)

#define PSCHED_TICKS_PER_SEC		PSCHED_NS2TICKS(NSEC_PER_SEC)
#define PSCHED_PASTPERFECT		0

static inline psched_time_t psched_get_time(void)
{
	return PSCHED_NS2TICKS(ktime_get_ns());
}

static inline psched_tdiff_t
psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
{
	return min(tv1 - tv2, bound);
}

struct qdisc_watchdog {
	u64		last_expires;
	struct hrtimer	timer;
	struct Qdisc	*qdisc;
};

void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);

static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
					   psched_time_t expires)
{
	qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
}

void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);

extern struct Qdisc_ops pfifo_qdisc_ops;
extern struct Qdisc_ops bfifo_qdisc_ops;
extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;

int fifo_set_limit(struct Qdisc *q, unsigned int limit);
struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
			       unsigned int limit);

int register_qdisc(struct Qdisc_ops *qops);
int unregister_qdisc(struct Qdisc_ops *qops);
void qdisc_get_default(char *id, size_t len);
int qdisc_set_default(const char *id);

void qdisc_hash_add(struct Qdisc *q, bool invisible);
void qdisc_hash_del(struct Qdisc *q);
struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
					struct nlattr *tab);
void qdisc_put_rtab(struct qdisc_rate_table *tab);
void qdisc_put_stab(struct qdisc_size_table *tab);
void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
		    struct net_device *dev, struct netdev_queue *txq,
		    spinlock_t *root_lock, bool validate);

void __qdisc_run(struct Qdisc *q);

static inline void qdisc_run(struct Qdisc *q)
{
	if (qdisc_run_begin(q))
		__qdisc_run(q);
}

static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
{
	/* We need to take extra care in case the skb came via
	 * vlan accelerated path. In that case, use skb->vlan_proto
	 * as the original vlan header was already stripped.
	 */
	if (skb_vlan_tag_present(skb))
		return skb->vlan_proto;
	return skb->protocol;
}

/* Calculate maximal size of packet seen by hard_start_xmit
   routine of this device.
 */
static inline unsigned int psched_mtu(const struct net_device *dev)
{
	return dev->mtu + dev->hard_header_len;
}

static inline struct net *qdisc_net(struct Qdisc *q)
{
	return dev_net(q->dev_queue->dev);
}

struct tc_cbs_qopt_offload {
	u8 enable;
	s32 queue;
	s32 hicredit;
	s32 locredit;
	s32 idleslope;
	s32 sendslope;
};

#endif

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Name Type Size Permission Actions
9p Folder 0755
bluetooth Folder 0755
caif Folder 0755
iucv Folder 0755
netfilter Folder 0755
netns Folder 0755
nfc Folder 0755
phonet Folder 0755
sctp Folder 0755
tc_act Folder 0755
6lowpan.h File 10.03 KB 0644
Space.h File 1.15 KB 0644
act_api.h File 6.38 KB 0644
addrconf.h File 12.63 KB 0644
af_ieee802154.h File 1.55 KB 0644
af_rxrpc.h File 2.79 KB 0644
af_unix.h File 2.22 KB 0644
af_vsock.h File 7.21 KB 0644
ah.h File 382 B 0644
arp.h File 2 KB 0644
atmclip.h File 1.48 KB 0644
ax25.h File 15.02 KB 0644
ax88796.h File 998 B 0644
bond_3ad.h File 9.79 KB 0644
bond_alb.h File 6.6 KB 0644
bond_options.h File 3.92 KB 0644
bonding.h File 19.1 KB 0644
busy_poll.h File 3.8 KB 0644
calipso.h File 2.15 KB 0644
cfg80211-wext.h File 1.95 KB 0644
cfg80211.h File 221.24 KB 0644
cfg802154.h File 10.89 KB 0644
checksum.h File 4.76 KB 0644
cipso_ipv4.h File 8.2 KB 0644
cls_cgroup.h File 2.15 KB 0644
codel.h File 5.65 KB 0644
codel_impl.h File 7.98 KB 0644
codel_qdisc.h File 2.9 KB 0644
compat.h File 2.11 KB 0644
datalink.h File 619 B 0644
dcbevent.h File 1.26 KB 0644
dcbnl.h File 4.2 KB 0644
devlink.h File 13.25 KB 0644
dn.h File 6.88 KB 0644
dn_dev.h File 5.36 KB 0644
dn_fib.h File 3.98 KB 0644
dn_neigh.h File 968 B 0644
dn_nsp.h File 5.83 KB 0644
dn_route.h File 4.36 KB 0644
dsa.h File 13.94 KB 0644
dsfield.h File 1.11 KB 0644
dst.h File 13.48 KB 0644
dst_cache.h File 2.53 KB 0644
dst_metadata.h File 5.39 KB 0644
dst_ops.h File 2 KB 0644
erspan.h File 2.11 KB 0644
esp.h File 877 B 0644
ethoc.h File 538 B 0644
fib_notifier.h File 1.29 KB 0644
fib_rules.h File 4.18 KB 0644
firewire.h File 636 B 0644
flow.h File 6.16 KB 0644
flow_dissector.h File 7.55 KB 0644
fou.h File 549 B 0644
fq.h File 2.67 KB 0644
fq_impl.h File 6.9 KB 0644
garp.h File 2.62 KB 0644
gen_stats.h File 2.34 KB 0644
genetlink.h File 11.3 KB 0644
geneve.h File 1.67 KB 0644
gre.h File 2.99 KB 0644
gro_cells.h File 443 B 0644
gtp.h File 633 B 0644
gue.h File 3.23 KB 0644
hwbm.h File 937 B 0644
icmp.h File 2.01 KB 0644
ieee80211_radiotap.h File 6.63 KB 0644
ieee802154_netdev.h File 9.14 KB 0644
if_inet6.h File 6.13 KB 0644
ife.h File 1.06 KB 0644
ila.h File 498 B 0644
inet6_connection_sock.h File 976 B 0644
inet6_hashtables.h File 3.7 KB 0644
inet_common.h File 1.89 KB 0644
inet_connection_sock.h File 10.48 KB 0644
inet_ecn.h File 6.02 KB 0644
inet_frag.h File 4.51 KB 0644
inet_hashtables.h File 12.91 KB 0644
inet_sock.h File 8.25 KB 0644
inet_timewait_sock.h File 3.82 KB 0644
inetpeer.h File 3.29 KB 0644
ip.h File 18.51 KB 0644
ip6_checksum.h File 2.89 KB 0644
ip6_fib.h File 10.04 KB 0644
ip6_route.h File 7.63 KB 0644
ip6_tunnel.h File 4.72 KB 0644
ip_fib.h File 10.72 KB 0644
ip_tunnels.h File 13.61 KB 0644
ip_vs.h File 46.78 KB 0644
ipcomp.h File 659 B 0644
ipconfig.h File 811 B 0644
ipv6.h File 29.97 KB 0644
ipv6_frag.h File 2.54 KB 0644
ipx.h File 4.4 KB 0644
iw_handler.h File 20.91 KB 0644
kcm.h File 4.96 KB 0644
l3mdev.h File 5.86 KB 0644
lapb.h File 4.75 KB 0644
lib80211.h File 3.92 KB 0644
llc.h File 4.41 KB 0644
llc_c_ac.h File 9.31 KB 0644
llc_c_ev.h File 10.68 KB 0644
llc_c_st.h File 1.72 KB 0644
llc_conn.h File 4.06 KB 0644
llc_if.h File 2.16 KB 0644
llc_pdu.h File 14.44 KB 0644
llc_s_ac.h File 1.55 KB 0644
llc_s_ev.h File 2.2 KB 0644
llc_s_st.h File 947 B 0644
llc_sap.h File 1.08 KB 0644
lwtunnel.h File 5.84 KB 0644
mac80211.h File 230.36 KB 0644
mac802154.h File 15.27 KB 0644
mip6.h File 1.58 KB 0644
mld.h File 2.8 KB 0644
mpls.h File 932 B 0644
mpls_iptunnel.h File 827 B 0644
mrp.h File 3.03 KB 0644
ncsi.h File 1.92 KB 0644
ndisc.h File 13.77 KB 0644
neighbour.h File 15.06 KB 0644
net_namespace.h File 10.08 KB 0644
net_ratelimit.h File 220 B 0644
netevent.h File 910 B 0644
netlabel.h File 20.74 KB 0644
netlink.h File 40.39 KB 0644
netprio_cgroup.h File 1.24 KB 0644
netrom.h File 7.68 KB 0644
nexthop.h File 865 B 0644
nl802154.h File 12.09 KB 0644
nsh.h File 12.31 KB 0644
p8022.h File 447 B 0644
ping.h File 3.45 KB 0644
pkt_cls.h File 17.34 KB 0644
pkt_sched.h File 4.05 KB 0644
pptp.h File 557 B 0644
protocol.h File 4.08 KB 0644
psample.h File 860 B 0644
psnap.h File 351 B 0644
raw.h File 2.07 KB 0644
rawv6.h File 854 B 0644
red.h File 10.45 KB 0644
regulatory.h File 10.12 KB 0644
request_sock.h File 6.46 KB 0644
rose.h File 7.62 KB 0644
route.h File 10.02 KB 0644
rtnetlink.h File 6.13 KB 0644
sch_generic.h File 23.3 KB 0644
scm.h File 3.5 KB 0644
secure_seq.h File 855 B 0644
seg6.h File 1.66 KB 0644
seg6_hmac.h File 1.65 KB 0644
slhc_vj.h File 6.67 KB 0644
smc.h File 440 B 0644
snmp.h File 5.23 KB 0644
sock.h File 69.75 KB 0644
sock_reuseport.h File 863 B 0644
stp.h File 383 B 0644
strparser.h File 3.75 KB 0644
switchdev.h File 6.52 KB 0644
tcp.h File 62.8 KB 0644
tcp_states.h File 1.26 KB 0644
timewait_sock.h File 1.11 KB 0644
tipc.h File 2.34 KB 0644
tls.h File 7.12 KB 0644
transp_v6.h File 2.08 KB 0644
tso.h File 515 B 0644
tun_proto.h File 988 B 0644
udp.h File 12.82 KB 0644
udp_tunnel.h File 5.12 KB 0644
udplite.h File 3.83 KB 0644
vsock_addr.h File 1.05 KB 0644
vxlan.h File 10.43 KB 0644
wext.h File 1.51 KB 0644
wimax.h File 19.97 KB 0644
x25.h File 9.43 KB 0644
x25device.h File 387 B 0644
xfrm.h File 53.72 KB 0644