/* 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_H#define __NET_SCHED_FQ_H #include <linux/skbuff.h>#include <linux/spinlock.h>#include <linux/types.h> struct fq_tin; /** * struct fq_flow - per traffic flow queue * * @tin: owner of this flow. Used to manage collisions, i.e. when a packet *	hashes to an index which points to a flow that is already owned by a *	different tin the packet is destined to. In such case the implementer *	must provide a fallback flow * @flowchain: can be linked to fq_tin's new_flows or old_flows. Used for DRR++ *	(deficit round robin) based round robin queuing similar to the one *	found in net/sched/sch_fq_codel.c * @queue: sk_buff queue to hold packets * @backlog: number of bytes pending in the queue. The number of packets can be *	found in @queue.qlen * @deficit: used for DRR++ */struct fq_flow {	struct fq_tin *tin;	struct list_head flowchain;	struct sk_buff_head queue;	u32 backlog;	int deficit;}; /** * struct fq_tin - a logical container of fq_flows * * Used to group fq_flows into a logical aggregate. DRR++ scheme is used to * pull interleaved packets out of the associated flows. * * @new_flows: linked list of fq_flow * @old_flows: linked list of fq_flow */struct fq_tin {	struct list_head new_flows;	struct list_head old_flows;	struct list_head tin_list;	struct fq_flow default_flow;	u32 backlog_bytes;	u32 backlog_packets;	u32 overlimit;	u32 collisions;	u32 flows;	u32 tx_bytes;	u32 tx_packets;}; /** * struct fq - main container for fair queuing purposes * * @limit: max number of packets that can be queued across all flows * @backlog: number of packets queued across all flows */struct fq {	struct fq_flow *flows;	unsigned long *flows_bitmap; 	struct list_head tin_backlog;	spinlock_t lock;	u32 flows_cnt;	u32 limit;	u32 memory_limit;	u32 memory_usage;	u32 quantum;	u32 backlog;	u32 overlimit;	u32 overmemory;	u32 collisions;}; typedef struct sk_buff *fq_tin_dequeue_t(struct fq *,					 struct fq_tin *,					 struct fq_flow *flow); typedef void fq_skb_free_t(struct fq *,			   struct fq_tin *,			   struct fq_flow *,			   struct sk_buff *); /* Return %true to filter (drop) the frame. */typedef bool fq_skb_filter_t(struct fq *,			     struct fq_tin *,			     struct fq_flow *,			     struct sk_buff *,			     void *); #endif