1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2016 Qualcomm Atheros, Inc 4 * 5 * Based on net/sched/sch_fq_codel.c 6 */ 7 #ifndef __NET_SCHED_FQ_H 8 #define __NET_SCHED_FQ_H 9 10 struct fq_tin; 11 12 /** 13 * struct fq_flow - per traffic flow queue 14 * 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 * @queue: sk_buff queue to hold packets 23 * @backlog: number of bytes pending in the queue. The number of packets can be 24 * found in @queue.qlen 25 * @deficit: used for DRR++ 26 */ 27 struct fq_flow { 28 struct fq_tin *tin; 29 struct list_head flowchain; 30 struct sk_buff_head queue; 31 u32 backlog; 32 int deficit; 33 }; 34 35 /** 36 * struct fq_tin - a logical container of fq_flows 37 * 38 * Used to group fq_flows into a logical aggregate. DRR++ scheme is used to 39 * pull interleaved packets out of the associated flows. 40 * 41 * @new_flows: linked list of fq_flow 42 * @old_flows: linked list of fq_flow 43 */ 44 struct fq_tin { 45 struct list_head new_flows; 46 struct list_head old_flows; 47 struct list_head tin_list; 48 struct fq_flow default_flow; 49 u32 backlog_bytes; 50 u32 backlog_packets; 51 u32 overlimit; 52 u32 collisions; 53 u32 flows; 54 u32 tx_bytes; 55 u32 tx_packets; 56 }; 57 58 /** 59 * struct fq - main container for fair queuing purposes 60 * 61 * @limit: max number of packets that can be queued across all flows 62 * @backlog: number of packets queued across all flows 63 */ 64 struct fq { 65 struct fq_flow *flows; 66 unsigned long *flows_bitmap; 67 68 struct list_head tin_backlog; 69 spinlock_t lock; 70 u32 flows_cnt; 71 u32 limit; 72 u32 memory_limit; 73 u32 memory_usage; 74 u32 quantum; 75 u32 backlog; 76 u32 overlimit; 77 u32 overmemory; 78 u32 collisions; 79 }; 80 81 typedef struct sk_buff *fq_tin_dequeue_t(struct fq *, 82 struct fq_tin *, 83 struct fq_flow *flow); 84 85 typedef void fq_skb_free_t(struct fq *, 86 struct fq_tin *, 87 struct fq_flow *, 88 struct sk_buff *); 89 90 /* Return %true to filter (drop) the frame. */ 91 typedef bool fq_skb_filter_t(struct fq *, 92 struct fq_tin *, 93 struct fq_flow *, 94 struct sk_buff *, 95 void *); 96 97 typedef struct fq_flow *fq_flow_get_default_t(struct fq *, 98 struct fq_tin *, 99 int idx, 100 struct sk_buff *); 101 102 #endif 103
