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6lowpan.h	10.03 MB	View DL Edit
act_api.h	9.26 MB	View DL Edit
addrconf.h	14.09 MB	View DL Edit
af_ieee802154.h	1.19 MB	View DL Edit
af_rxrpc.h	2.94 MB	View DL Edit
af_unix.h	2.89 MB	View DL Edit
af_vsock.h	8.21 MB	View DL Edit
ah.h	382 B	View DL Edit
arp.h	2.09 MB	View DL Edit
atmclip.h	1.48 MB	View DL Edit
ax25.h	14.87 MB	View DL Edit
ax88796.h	1.33 MB	View DL Edit
bareudp.h	333 B	View DL Edit
bonding.h	20.88 MB	View DL Edit
bond_3ad.h	9.4 MB	View DL Edit
bond_alb.h	6.1 MB	View DL Edit
bond_options.h	4.66 MB	View DL Edit
bpf_sk_storage.h	1.74 MB	View DL Edit
busy_poll.h	3.87 MB	View DL Edit
calipso.h	1.55 MB	View DL Edit
cfg80211-wext.h	1.86 MB	View DL Edit
cfg80211.h	326.77 MB	View DL Edit
cfg802154.h	10.57 MB	View DL Edit
checksum.h	4.59 MB	View DL Edit
cipso_ipv4.h	7.37 MB	View DL Edit
cls_cgroup.h	2.04 MB	View DL Edit
codel.h	5.86 MB	View DL Edit
codel_impl.h	8.3 MB	View DL Edit
codel_qdisc.h	2.95 MB	View DL Edit
compat.h	2.18 MB	View DL Edit
datalink.h	716 B	View DL Edit
dcbevent.h	766 B	View DL Edit
dcbnl.h	4.42 MB	View DL Edit
devlink.h	71.25 MB	View DL Edit
dn.h	6.88 MB	View DL Edit
dn_dev.h	5.39 MB	View DL Edit
dn_fib.h	4.04 MB	View DL Edit
dn_neigh.h	996 B	View DL Edit
dn_nsp.h	5.5 MB	View DL Edit
dn_route.h	4.01 MB	View DL Edit
dropreason-core.h	11.96 MB	View DL Edit
dropreason.h	1.36 MB	View DL Edit
dsa.h	33.42 MB	View DL Edit
dsa_stubs.h	1.3 MB	View DL Edit
dsfield.h	1.12 MB	View DL Edit
dst.h	14.69 MB	View DL Edit
dst_cache.h	2.96 MB	View DL Edit
dst_metadata.h	6.34 MB	View DL Edit
dst_ops.h	2.34 MB	View DL Edit
erspan.h	9.04 MB	View DL Edit
esp.h	1.18 MB	View DL Edit
espintcp.h	966 B	View DL Edit
ethoc.h	439 B	View DL Edit
failover.h	1.18 MB	View DL Edit
fib_notifier.h	1.35 MB	View DL Edit
fib_rules.h	6.48 MB	View DL Edit
firewire.h	662 B	View DL Edit
flow.h	5.87 MB	View DL Edit
flow_dissector.h	11.74 MB	View DL Edit
flow_offload.h	17.18 MB	View DL Edit
fou.h	549 B	View DL Edit
fq.h	2.55 MB	View DL Edit
fq_impl.h	7.98 MB	View DL Edit
garp.h	2.67 MB	View DL Edit
genetlink.h	16.99 MB	View DL Edit
geneve.h	1.85 MB	View DL Edit
gen_stats.h	2.99 MB	View DL Edit
gre.h	3.29 MB	View DL Edit
gro.h	11.69 MB	View DL Edit
gro_cells.h	443 B	View DL Edit
gso.h	3.2 MB	View DL Edit
gtp.h	1.46 MB	View DL Edit
gue.h	3.29 MB	View DL Edit
handshake.h	1.39 MB	View DL Edit
hwbm.h	995 B	View DL Edit
icmp.h	1.87 MB	View DL Edit
ieee80211_radiotap.h	22.96 MB	View DL Edit
ieee802154_netdev.h	8.75 MB	View DL Edit
ife.h	1.03 MB	View DL Edit
if_inet6.h	6.62 MB	View DL Edit
ila.h	308 B	View DL Edit
inet6_connection_sock.h	794 B	View DL Edit
inet6_hashtables.h	3.6 MB	View DL Edit
inetpeer.h	3.29 MB	View DL Edit
inet_common.h	2.89 MB	View DL Edit
inet_connection_sock.h	10.76 MB	View DL Edit
inet_dscp.h	1.55 MB	View DL Edit
inet_ecn.h	7.83 MB	View DL Edit
inet_frag.h	5.26 MB	View DL Edit
inet_hashtables.h	12.28 MB	View DL Edit
inet_sock.h	9.45 MB	View DL Edit
inet_timewait_sock.h	3.65 MB	View DL Edit
ip.h	21.98 MB	View DL Edit
ip6_checksum.h	2.47 MB	View DL Edit
ip6_fib.h	15.89 MB	View DL Edit
ip6_route.h	9.97 MB	View DL Edit
ip6_tunnel.h	5.01 MB	View DL Edit
ipcomp.h	737 B	View DL Edit
ipconfig.h	837 B	View DL Edit
ipv6.h	37.62 MB	View DL Edit
ipv6_frag.h	3.36 MB	View DL Edit
ipv6_stubs.h	3.45 MB	View DL Edit
ipx.h	4.28 MB	View DL Edit
ip_fib.h	16.23 MB	View DL Edit
ip_tunnels.h	13.98 MB	View DL Edit
ip_vs.h	49.62 MB	View DL Edit
iw_handler.h	20.66 MB	View DL Edit
kcm.h	4.82 MB	View DL Edit
l3mdev.h	7.18 MB	View DL Edit
lag.h	409 B	View DL Edit
lapb.h	4.81 MB	View DL Edit
lib80211.h	3.92 MB	View DL Edit
llc.h	4.38 MB	View DL Edit
llc_conn.h	4.09 MB	View DL Edit
llc_c_ac.h	9.39 MB	View DL Edit
llc_c_ev.h	10.68 MB	View DL Edit
llc_c_st.h	1.77 MB	View DL Edit
llc_if.h	2.16 MB	View DL Edit
llc_pdu.h	14.44 MB	View DL Edit
llc_sap.h	1.08 MB	View DL Edit
llc_s_ac.h	1.59 MB	View DL Edit
llc_s_ev.h	2.22 MB	View DL Edit
llc_s_st.h	947 B	View DL Edit
lwtunnel.h	6.75 MB	View DL Edit
mac80211.h	291.99 MB	View DL Edit
mac802154.h	14.88 MB	View DL Edit
macsec.h	8.12 MB	View DL Edit
mip6.h	1016 B	View DL Edit
mld.h	2.85 MB	View DL Edit
mpls.h	943 B	View DL Edit
mpls_iptunnel.h	481 B	View DL Edit
mptcp.h	7.35 MB	View DL Edit
mrp.h	3.11 MB	View DL Edit
ncsi.h	1.94 MB	View DL Edit
ndisc.h	15.05 MB	View DL Edit
neighbour.h	16.54 MB	View DL Edit
netdev_queues.h	5.75 MB	View DL Edit
netevent.h	1.04 MB	View DL Edit
netlabel.h	20.14 MB	View DL Edit
netlink.h	62.05 MB	View DL Edit
netprio_cgroup.h	1.02 MB	View DL Edit
netrom.h	7.73 MB	View DL Edit
net_debug.h	5.07 MB	View DL Edit
net_failover.h	1023 B	View DL Edit
net_namespace.h	12.99 MB	View DL Edit
net_ratelimit.h	220 B	View DL Edit
net_trackers.h	424 B	View DL Edit
nexthop.h	12.34 MB	View DL Edit
nl802154.h	12 MB	View DL Edit
nsh.h	12.31 MB	View DL Edit
p8022.h	504 B	View DL Edit
pie.h	3.6 MB	View DL Edit
ping.h	2.8 MB	View DL Edit
pkt_cls.h	25.72 MB	View DL Edit
pkt_sched.h	7.57 MB	View DL Edit
pptp.h	604 B	View DL Edit
protocol.h	3.81 MB	View DL Edit
psample.h	1.06 MB	View DL Edit
psnap.h	430 B	View DL Edit
raw.h	2.48 MB	View DL Edit
rawv6.h	856 B	View DL Edit
red.h	11.33 MB	View DL Edit
regulatory.h	9.96 MB	View DL Edit
request_sock.h	6.47 MB	View DL Edit
rose.h	7.64 MB	View DL Edit
route.h	11.18 MB	View DL Edit
rpl.h	839 B	View DL Edit
rsi_91x.h	1.67 MB	View DL Edit
rtnetlink.h	7.16 MB	View DL Edit
rtnh.h	859 B	View DL Edit
sch_generic.h	32.44 MB	View DL Edit
scm.h	3.54 MB	View DL Edit
secure_seq.h	868 B	View DL Edit
seg6.h	2.18 MB	View DL Edit
seg6_hmac.h	1.44 MB	View DL Edit
seg6_local.h	644 B	View DL Edit
selftests.h	582 B	View DL Edit
slhc_vj.h	6.67 MB	View DL Edit
smc.h	2.24 MB	View DL Edit
snmp.h	5.14 MB	View DL Edit
sock.h	84.3 MB	View DL Edit
sock_reuseport.h	1.83 MB	View DL Edit
Space.h	1.07 MB	View DL Edit
stp.h	412 B	View DL Edit
strparser.h	4.25 MB	View DL Edit
switchdev.h	14.96 MB	View DL Edit
tcp.h	74.89 MB	View DL Edit
tcp_states.h	1.3 MB	View DL Edit
tcx.h	4.22 MB	View DL Edit
tc_wrapper.h	6.38 MB	View DL Edit
timewait_sock.h	925 B	View DL Edit
tipc.h	2.35 MB	View DL Edit
tls.h	13.68 MB	View DL Edit
tls_prot.h	1.84 MB	View DL Edit
tls_toe.h	2.94 MB	View DL Edit
transp_v6.h	1.95 MB	View DL Edit
tso.h	566 B	View DL Edit
tun_proto.h	1015 B	View DL Edit
udp.h	15.83 MB	View DL Edit
udplite.h	2.38 MB	View DL Edit
udp_tunnel.h	12.08 MB	View DL Edit
vsock_addr.h	662 B	View DL Edit
vxlan.h	14.49 MB	View DL Edit
wext.h	1.47 MB	View DL Edit
x25.h	9.49 MB	View DL Edit
x25device.h	387 B	View DL Edit
xdp.h	14.66 MB	View DL Edit
xdp_priv.h	427 B	View DL Edit
xdp_sock.h	2.37 MB	View DL Edit
xdp_sock_drv.h	7.63 MB	View DL Edit
xfrm.h	57.64 MB	View DL Edit
xsk_buff_pool.h	6.69 MB	View DL Edit

Edit file: /usr/src/kernels/5.14.0-427.31.1.el9_4.x86_64/include/net/codel_impl.h

#ifndef __NET_SCHED_CODEL_IMPL_H
#define __NET_SCHED_CODEL_IMPL_H

/*
 * Codel - The Controlled-Delay Active Queue Management algorithm
 *
 *  Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com>
 *  Copyright (C) 2011-2012 Van Jacobson <van@pollere.net>
 *  Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net>
 *  Copyright (C) 2012,2015 Eric Dumazet <edumazet@google.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, provided that this notice is retained in full, this
 * software may be distributed under the terms of the GNU General
 * Public License ("GPL") version 2, in which case the provisions of the
 * GPL apply INSTEAD OF those given above.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 */

/* Controlling Queue Delay (CoDel) algorithm
 * =========================================
 * Source : Kathleen Nichols and Van Jacobson
 * http://queue.acm.org/detail.cfm?id=2209336
 *
 * Implemented on linux by Dave Taht and Eric Dumazet
 */

#include <net/inet_ecn.h>

static void codel_params_init(struct codel_params *params)
{
	params->interval = MS2TIME(100);
	params->target = MS2TIME(5);
	params->ce_threshold = CODEL_DISABLED_THRESHOLD;
	params->ce_threshold_mask = 0;
	params->ce_threshold_selector = 0;
	params->ecn = false;
}

static void codel_vars_init(struct codel_vars *vars)
{
	memset(vars, 0, sizeof(*vars));
}

static void codel_stats_init(struct codel_stats *stats)
{
	stats->maxpacket = 0;
}

/*
 * http://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Iterative_methods_for_reciprocal_square_roots
 * new_invsqrt = (invsqrt / 2) * (3 - count * invsqrt^2)
 *
 * Here, invsqrt is a fixed point number (< 1.0), 32bit mantissa, aka Q0.32
 */
static void codel_Newton_step(struct codel_vars *vars)
{
	u32 invsqrt = ((u32)vars->rec_inv_sqrt) << REC_INV_SQRT_SHIFT;
	u32 invsqrt2 = ((u64)invsqrt * invsqrt) >> 32;
	u64 val = (3LL << 32) - ((u64)vars->count * invsqrt2);

val >>= 2; /* avoid overflow in following multiply */
	val = (val * invsqrt) >> (32 - 2 + 1);

vars->rec_inv_sqrt = val >> REC_INV_SQRT_SHIFT;
}

/*
 * CoDel control_law is t + interval/sqrt(count)
 * We maintain in rec_inv_sqrt the reciprocal value of sqrt(count) to avoid
 * both sqrt() and divide operation.
 */
static codel_time_t codel_control_law(codel_time_t t,
				      codel_time_t interval,
				      u32 rec_inv_sqrt)
{
	return t + reciprocal_scale(interval, rec_inv_sqrt << REC_INV_SQRT_SHIFT);
}

static bool codel_should_drop(const struct sk_buff *skb,
			      void *ctx,
			      struct codel_vars *vars,
			      struct codel_params *params,
			      struct codel_stats *stats,
			      codel_skb_len_t skb_len_func,
			      codel_skb_time_t skb_time_func,
			      u32 *backlog,
			      codel_time_t now)
{
	bool ok_to_drop;
	u32 skb_len;

if (!skb) {
		vars->first_above_time = 0;
		return false;
	}

skb_len = skb_len_func(skb);
	vars->ldelay = now - skb_time_func(skb);

if (unlikely(skb_len > stats->maxpacket))
		stats->maxpacket = skb_len;

if (codel_time_before(vars->ldelay, params->target) ||
	    *backlog <= params->mtu) {
		/* went below - stay below for at least interval */
		vars->first_above_time = 0;
		return false;
	}
	ok_to_drop = false;
	if (vars->first_above_time == 0) {
		/* just went above from below. If we stay above
		 * for at least interval we'll say it's ok to drop
		 */
		vars->first_above_time = now + params->interval;
	} else if (codel_time_after(now, vars->first_above_time)) {
		ok_to_drop = true;
	}
	return ok_to_drop;
}

static struct sk_buff *codel_dequeue(void *ctx,
				     u32 *backlog,
				     struct codel_params *params,
				     struct codel_vars *vars,
				     struct codel_stats *stats,
				     codel_skb_len_t skb_len_func,
				     codel_skb_time_t skb_time_func,
				     codel_skb_drop_t drop_func,
				     codel_skb_dequeue_t dequeue_func)
{
	struct sk_buff *skb = dequeue_func(vars, ctx);
	codel_time_t now;
	bool drop;

if (!skb) {
		vars->dropping = false;
		return skb;
	}
	now = codel_get_time();
	drop = codel_should_drop(skb, ctx, vars, params, stats,
				 skb_len_func, skb_time_func, backlog, now);
	if (vars->dropping) {
		if (!drop) {
			/* sojourn time below target - leave dropping state */
			vars->dropping = false;
		} else if (codel_time_after_eq(now, vars->drop_next)) {
			/* It's time for the next drop. Drop the current
			 * packet and dequeue the next. The dequeue might
			 * take us out of dropping state.
			 * If not, schedule the next drop.
			 * A large backlog might result in drop rates so high
			 * that the next drop should happen now,
			 * hence the while loop.
			 */
			while (vars->dropping &&
			       codel_time_after_eq(now, vars->drop_next)) {
				vars->count++; /* dont care of possible wrap
						* since there is no more divide
						*/
				codel_Newton_step(vars);
				if (params->ecn && INET_ECN_set_ce(skb)) {
					stats->ecn_mark++;
					vars->drop_next =
						codel_control_law(vars->drop_next,
								  params->interval,
								  vars->rec_inv_sqrt);
					goto end;
				}
				stats->drop_len += skb_len_func(skb);
				drop_func(skb, ctx);
				stats->drop_count++;
				skb = dequeue_func(vars, ctx);
				if (!codel_should_drop(skb, ctx,
						       vars, params, stats,
						       skb_len_func,
						       skb_time_func,
						       backlog, now)) {
					/* leave dropping state */
					vars->dropping = false;
				} else {
					/* and schedule the next drop */
					vars->drop_next =
						codel_control_law(vars->drop_next,
								  params->interval,
								  vars->rec_inv_sqrt);
				}
			}
		}
	} else if (drop) {
		u32 delta;

if (params->ecn && INET_ECN_set_ce(skb)) {
			stats->ecn_mark++;
		} else {
			stats->drop_len += skb_len_func(skb);
			drop_func(skb, ctx);
			stats->drop_count++;

skb = dequeue_func(vars, ctx);
			drop = codel_should_drop(skb, ctx, vars, params,
						 stats, skb_len_func,
						 skb_time_func, backlog, now);
		}
		vars->dropping = true;
		/* if min went above target close to when we last went below it
		 * assume that the drop rate that controlled the queue on the
		 * last cycle is a good starting point to control it now.
		 */
		delta = vars->count - vars->lastcount;
		if (delta > 1 &&
		    codel_time_before(now - vars->drop_next,
				      16 * params->interval)) {
			vars->count = delta;
			/* we dont care if rec_inv_sqrt approximation
			 * is not very precise :
			 * Next Newton steps will correct it quadratically.
			 */
			codel_Newton_step(vars);
		} else {
			vars->count = 1;
			vars->rec_inv_sqrt = ~0U >> REC_INV_SQRT_SHIFT;
		}
		vars->lastcount = vars->count;
		vars->drop_next = codel_control_law(now, params->interval,
						    vars->rec_inv_sqrt);
	}
end:
	if (skb && codel_time_after(vars->ldelay, params->ce_threshold)) {
		bool set_ce = true;

if (params->ce_threshold_mask) {
			int dsfield = skb_get_dsfield(skb);

set_ce = (dsfield >= 0 &&
				  (((u8)dsfield & params->ce_threshold_mask) ==
				   params->ce_threshold_selector));
		}
		if (set_ce && INET_ECN_set_ce(skb))
			stats->ce_mark++;
	}
	return skb;
}

#endif

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