ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / src / linux-headers-5.4.0-216 / include / net

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2016 Qualcomm Atheros, Inc
 *
 * Based on net/sched/sch_fq_codel.c
 */
#ifndef __NET_SCHED_FQ_IMPL_H
#define __NET_SCHED_FQ_IMPL_H

#include <net/fq.h>

/* functions that are embedded into includer */

static void fq_adjust_removal(struct fq *fq,
			      struct fq_flow *flow,
			      struct sk_buff *skb)
{
	struct fq_tin *tin = flow->tin;

tin->backlog_bytes -= skb->len;
	tin->backlog_packets--;
	flow->backlog -= skb->len;
	fq->backlog--;
	fq->memory_usage -= skb->truesize;
}

static void fq_rejigger_backlog(struct fq *fq, struct fq_flow *flow)
{
	struct fq_flow *i;

if (flow->backlog == 0) {
		list_del_init(&flow->backlogchain);
	} else {
		i = flow;

list_for_each_entry_continue(i, &fq->backlogs, backlogchain)
			if (i->backlog < flow->backlog)
				break;

list_move_tail(&flow->backlogchain,
			       &i->backlogchain);
	}
}

static struct sk_buff *fq_flow_dequeue(struct fq *fq,
				       struct fq_flow *flow)
{
	struct sk_buff *skb;

lockdep_assert_held(&fq->lock);

skb = __skb_dequeue(&flow->queue);
	if (!skb)
		return NULL;

fq_adjust_removal(fq, flow, skb);
	fq_rejigger_backlog(fq, flow);

return skb;
}

static struct sk_buff *fq_tin_dequeue(struct fq *fq,
				      struct fq_tin *tin,
				      fq_tin_dequeue_t dequeue_func)
{
	struct fq_flow *flow;
	struct list_head *head;
	struct sk_buff *skb;

lockdep_assert_held(&fq->lock);

begin:
	head = &tin->new_flows;
	if (list_empty(head)) {
		head = &tin->old_flows;
		if (list_empty(head))
			return NULL;
	}

flow = list_first_entry(head, struct fq_flow, flowchain);

if (flow->deficit <= 0) {
		flow->deficit += fq->quantum;
		list_move_tail(&flow->flowchain,
			       &tin->old_flows);
		goto begin;
	}

skb = dequeue_func(fq, tin, flow);
	if (!skb) {
		/* force a pass through old_flows to prevent starvation */
		if ((head == &tin->new_flows) &&
		    !list_empty(&tin->old_flows)) {
			list_move_tail(&flow->flowchain, &tin->old_flows);
		} else {
			list_del_init(&flow->flowchain);
			flow->tin = NULL;
		}
		goto begin;
	}

flow->deficit -= skb->len;
	tin->tx_bytes += skb->len;
	tin->tx_packets++;

return skb;
}

static u32 fq_flow_idx(struct fq *fq, struct sk_buff *skb)
{
	u32 hash = skb_get_hash_perturb(skb, &fq->perturbation);

return reciprocal_scale(hash, fq->flows_cnt);
}

static struct fq_flow *fq_flow_classify(struct fq *fq,
					struct fq_tin *tin, u32 idx,
					struct sk_buff *skb,
					fq_flow_get_default_t get_default_func)
{
	struct fq_flow *flow;

lockdep_assert_held(&fq->lock);

flow = &fq->flows[idx];
	if (flow->tin && flow->tin != tin) {
		flow = get_default_func(fq, tin, idx, skb);
		tin->collisions++;
		fq->collisions++;
	}

if (!flow->tin)
		tin->flows++;

return flow;
}

static void fq_recalc_backlog(struct fq *fq,
			      struct fq_tin *tin,
			      struct fq_flow *flow)
{
	struct fq_flow *i;

if (list_empty(&flow->backlogchain))
		list_add_tail(&flow->backlogchain, &fq->backlogs);

i = flow;
	list_for_each_entry_continue_reverse(i, &fq->backlogs,
					     backlogchain)
		if (i->backlog > flow->backlog)
			break;

list_move(&flow->backlogchain, &i->backlogchain);
}

static void fq_tin_enqueue(struct fq *fq,
			   struct fq_tin *tin, u32 idx,
			   struct sk_buff *skb,
			   fq_skb_free_t free_func,
			   fq_flow_get_default_t get_default_func)
{
	struct fq_flow *flow;
	bool oom;

lockdep_assert_held(&fq->lock);

flow = fq_flow_classify(fq, tin, idx, skb, get_default_func);

flow->tin = tin;
	flow->backlog += skb->len;
	tin->backlog_bytes += skb->len;
	tin->backlog_packets++;
	fq->memory_usage += skb->truesize;
	fq->backlog++;

fq_recalc_backlog(fq, tin, flow);

if (list_empty(&flow->flowchain)) {
		flow->deficit = fq->quantum;
		list_add_tail(&flow->flowchain,
			      &tin->new_flows);
	}

__skb_queue_tail(&flow->queue, skb);
	oom = (fq->memory_usage > fq->memory_limit);
	while (fq->backlog > fq->limit || oom) {
		flow = list_first_entry_or_null(&fq->backlogs,
						struct fq_flow,
						backlogchain);
		if (!flow)
			return;

skb = fq_flow_dequeue(fq, flow);
		if (!skb)
			return;

free_func(fq, flow->tin, flow, skb);

flow->tin->overlimit++;
		fq->overlimit++;
		if (oom) {
			fq->overmemory++;
			oom = (fq->memory_usage > fq->memory_limit);
		}
	}
}

static void fq_flow_filter(struct fq *fq,
			   struct fq_flow *flow,
			   fq_skb_filter_t filter_func,
			   void *filter_data,
			   fq_skb_free_t free_func)
{
	struct fq_tin *tin = flow->tin;
	struct sk_buff *skb, *tmp;

lockdep_assert_held(&fq->lock);

skb_queue_walk_safe(&flow->queue, skb, tmp) {
		if (!filter_func(fq, tin, flow, skb, filter_data))
			continue;

__skb_unlink(skb, &flow->queue);
		fq_adjust_removal(fq, flow, skb);
		free_func(fq, tin, flow, skb);
	}

fq_rejigger_backlog(fq, flow);
}

static void fq_tin_filter(struct fq *fq,
			  struct fq_tin *tin,
			  fq_skb_filter_t filter_func,
			  void *filter_data,
			  fq_skb_free_t free_func)
{
	struct fq_flow *flow;

lockdep_assert_held(&fq->lock);

list_for_each_entry(flow, &tin->new_flows, flowchain)
		fq_flow_filter(fq, flow, filter_func, filter_data, free_func);
	list_for_each_entry(flow, &tin->old_flows, flowchain)
		fq_flow_filter(fq, flow, filter_func, filter_data, free_func);
}

static void fq_flow_reset(struct fq *fq,
			  struct fq_flow *flow,
			  fq_skb_free_t free_func)
{
	struct sk_buff *skb;

while ((skb = fq_flow_dequeue(fq, flow)))
		free_func(fq, flow->tin, flow, skb);

if (!list_empty(&flow->flowchain))
		list_del_init(&flow->flowchain);

if (!list_empty(&flow->backlogchain))
		list_del_init(&flow->backlogchain);

flow->tin = NULL;

WARN_ON_ONCE(flow->backlog);
}

static void fq_tin_reset(struct fq *fq,
			 struct fq_tin *tin,
			 fq_skb_free_t free_func)
{
	struct list_head *head;
	struct fq_flow *flow;

for (;;) {
		head = &tin->new_flows;
		if (list_empty(head)) {
			head = &tin->old_flows;
			if (list_empty(head))
				break;
		}

flow = list_first_entry(head, struct fq_flow, flowchain);
		fq_flow_reset(fq, flow, free_func);
	}

WARN_ON_ONCE(tin->backlog_bytes);
	WARN_ON_ONCE(tin->backlog_packets);
}

static void fq_flow_init(struct fq_flow *flow)
{
	INIT_LIST_HEAD(&flow->flowchain);
	INIT_LIST_HEAD(&flow->backlogchain);
	__skb_queue_head_init(&flow->queue);
}

static void fq_tin_init(struct fq_tin *tin)
{
	INIT_LIST_HEAD(&tin->new_flows);
	INIT_LIST_HEAD(&tin->old_flows);
}

static int fq_init(struct fq *fq, int flows_cnt)
{
	int i;

memset(fq, 0, sizeof(fq[0]));
	INIT_LIST_HEAD(&fq->backlogs);
	spin_lock_init(&fq->lock);
	fq->flows_cnt = max_t(u32, flows_cnt, 1);
	get_random_bytes(&fq->perturbation, sizeof(fq->perturbation));
	fq->quantum = 300;
	fq->limit = 8192;
	fq->memory_limit = 16 << 20; /* 16 MBytes */

fq->flows = kvcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
	if (!fq->flows)
		return -ENOMEM;

for (i = 0; i < fq->flows_cnt; i++)
		fq_flow_init(&fq->flows[i]);

return 0;
}

static void fq_reset(struct fq *fq,
		     fq_skb_free_t free_func)
{
	int i;

for (i = 0; i < fq->flows_cnt; i++)
		fq_flow_reset(fq, &fq->flows[i], free_func);

kvfree(fq->flows);
	fq->flows = NULL;
}

#endif

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[+] netfilter
[-] slhc_vj.h [edit]
[-] ipconfig.h [edit]
[-] ax88796.h [edit]
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[-] stp.h [edit]
[-] mac80211.h [edit]
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[-] fq.h [edit]
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[-] llc_c_ev.h [edit]
[-] ah.h [edit]
[-] pkt_cls.h [edit]
[-] ping.h [edit]
[-] cipso_ipv4.h [edit]
[-] af_rxrpc.h [edit]
[+] bluetooth
[-] inet_sock.h [edit]
[-] llc_c_ac.h [edit]
[-] iw_handler.h [edit]
[-] wext.h [edit]
[-] mac802154.h [edit]
[-] 6lowpan.h [edit]
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[-] seg6_local.h [edit]
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[-] snmp.h [edit]
[-] netevent.h [edit]
[-] ip6_route.h [edit]
[-] raw.h [edit]
[-] secure_seq.h [edit]
[-] flow_offload.h [edit]
[-] pptp.h [edit]
[-] ip6_fib.h [edit]
[+] tc_act
[-] calipso.h [edit]
[-] busy_poll.h [edit]
[-] request_sock.h [edit]
[-] firewire.h [edit]
[-] ipv6_stubs.h [edit]
[-] p8022.h [edit]
[+] phonet
[-] fib_notifier.h [edit]
[-] kcm.h [edit]
[-] ip6_tunnel.h [edit]
[-] psample.h [edit]
[-] inet_hashtables.h [edit]
[-] drop_monitor.h [edit]
[-] sock_reuseport.h [edit]
[-] tls.h [edit]
[-] mld.h [edit]
[-] tcp_states.h [edit]
[-] ieee802154_netdev.h [edit]
[-] datalink.h [edit]
[-] codel.h [edit]
[+] nfc
[-] rtnetlink.h [edit]
[-] llc_sap.h [edit]
[-] geneve.h [edit]
[-] xdp_sock.h [edit]
[-] compat.h [edit]
[-] bond_3ad.h [edit]
[-] fq_impl.h [edit]
[-] x25.h [edit]
[-] ife.h [edit]
[-] fib_rules.h [edit]
[-] transp_v6.h [edit]
[-] ncsi.h [edit]
[-] lapb.h [edit]
[-] ipv6.h [edit]
[-] inet_common.h [edit]
[-] inet_timewait_sock.h [edit]
[-] protocol.h [edit]
[-] inet6_hashtables.h [edit]
[-] llc_s_ev.h [edit]
[-] inet_connection_sock.h [edit]
[-] bond_alb.h [edit]
[-] flow.h [edit]
[-] sock.h [edit]
[-] dsa.h [edit]
[+] netns
[-] net_namespace.h [edit]
[-] checksum.h [edit]
[-] xdp_priv.h [edit]
[-] vxlan.h [edit]
[-] cfg802154.h [edit]
[-] netlabel.h [edit]
[-] red.h [edit]
[-] scm.h [edit]
[-] rsi_91x.h [edit]
[-] llc_s_st.h [edit]
[-] gro_cells.h [edit]
[-] addrconf.h [edit]
[-] if_inet6.h [edit]
[-] udp_tunnel.h [edit]
[+] caif
[-] ax25.h [edit]
[-] dcbnl.h [edit]
[-] lag.h [edit]
[-] cls_cgroup.h [edit]
[-] lwtunnel.h [edit]
[-] llc_s_ac.h [edit]