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1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2016 Qualcomm Atheros, Inc
5 * Based on net/sched/sch_fq_codel.c
7 #ifndef __NET_SCHED_FQ_H
8 #define __NET_SCHED_FQ_H
13 * struct fq_flow - per traffic flow queue
15 * @tin: owner of this flow. Used to manage collisions, i.e. when a packet
16 * hashes to an index which points to a flow that is already owned by a
17 * different tin the packet is destined to. In such case the implementer
18 * must provide a fallback flow
19 * @flowchain: can be linked to fq_tin's new_flows or old_flows. Used for DRR++
20 * (deficit round robin) based round robin queuing similar to the one
21 * found in net/sched/sch_fq_codel.c
22 * @backlogchain: can be linked to other fq_flow and fq. Used to keep track of
23 * fat flows and efficient head-dropping if packet limit is reached
24 * @queue: sk_buff queue to hold packets
25 * @backlog: number of bytes pending in the queue. The number of packets can be
26 * found in @queue.qlen
27 * @deficit: used for DRR++
31 struct list_head flowchain
;
32 struct list_head backlogchain
;
33 struct sk_buff_head queue
;
39 * struct fq_tin - a logical container of fq_flows
41 * Used to group fq_flows into a logical aggregate. DRR++ scheme is used to
42 * pull interleaved packets out of the associated flows.
44 * @new_flows: linked list of fq_flow
45 * @old_flows: linked list of fq_flow
48 struct list_head new_flows
;
49 struct list_head old_flows
;
60 * struct fq - main container for fair queuing purposes
62 * @backlogs: linked to fq_flows. Used to maintain fat flows for efficient
63 * head-dropping when @backlog reaches @limit
64 * @limit: max number of packets that can be queued across all flows
65 * @backlog: number of packets queued across all flows
68 struct fq_flow
*flows
;
69 struct list_head backlogs
;
82 typedef struct sk_buff
*fq_tin_dequeue_t(struct fq
*,
84 struct fq_flow
*flow
);
86 typedef void fq_skb_free_t(struct fq
*,
91 /* Return %true to filter (drop) the frame. */
92 typedef bool fq_skb_filter_t(struct fq
*,
98 typedef struct fq_flow
*fq_flow_get_default_t(struct fq
*,