| Michal Kazior | 557fc4a | 2016-04-22 14:20:13 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2016 Qualcomm Atheros, Inc |
| 3 | * |
| 4 | * GPL v2 |
| 5 | * |
| 6 | * Based on net/sched/sch_fq_codel.c |
| 7 | */ |
| 8 | #ifndef __NET_SCHED_FQ_H |
| 9 | #define __NET_SCHED_FQ_H |
| 10 | |
| 11 | struct fq_tin; |
| 12 | |
| 13 | /** |
| 14 | * struct fq_flow - per traffic flow queue |
| 15 | * |
| 16 | * @tin: owner of this flow. Used to manage collisions, i.e. when a packet |
| 17 | * hashes to an index which points to a flow that is already owned by a |
| 18 | * different tin the packet is destined to. In such case the implementer |
| 19 | * must provide a fallback flow |
| 20 | * @flowchain: can be linked to fq_tin's new_flows or old_flows. Used for DRR++ |
| 21 | * (deficit round robin) based round robin queuing similar to the one |
| 22 | * found in net/sched/sch_fq_codel.c |
| 23 | * @backlogchain: can be linked to other fq_flow and fq. Used to keep track of |
| 24 | * fat flows and efficient head-dropping if packet limit is reached |
| 25 | * @queue: sk_buff queue to hold packets |
| 26 | * @backlog: number of bytes pending in the queue. The number of packets can be |
| 27 | * found in @queue.qlen |
| 28 | * @deficit: used for DRR++ |
| 29 | */ |
| 30 | struct fq_flow { |
| 31 | struct fq_tin *tin; |
| 32 | struct list_head flowchain; |
| 33 | struct list_head backlogchain; |
| 34 | struct sk_buff_head queue; |
| 35 | u32 backlog; |
| 36 | int deficit; |
| 37 | }; |
| 38 | |
| 39 | /** |
| 40 | * struct fq_tin - a logical container of fq_flows |
| 41 | * |
| 42 | * Used to group fq_flows into a logical aggregate. DRR++ scheme is used to |
| 43 | * pull interleaved packets out of the associated flows. |
| 44 | * |
| 45 | * @new_flows: linked list of fq_flow |
| 46 | * @old_flows: linked list of fq_flow |
| 47 | */ |
| 48 | struct fq_tin { |
| 49 | struct list_head new_flows; |
| 50 | struct list_head old_flows; |
| 51 | u32 backlog_bytes; |
| 52 | u32 backlog_packets; |
| 53 | u32 overlimit; |
| 54 | u32 collisions; |
| 55 | u32 flows; |
| 56 | u32 tx_bytes; |
| 57 | u32 tx_packets; |
| 58 | }; |
| 59 | |
| 60 | /** |
| 61 | * struct fq - main container for fair queuing purposes |
| 62 | * |
| 63 | * @backlogs: linked to fq_flows. Used to maintain fat flows for efficient |
| 64 | * head-dropping when @backlog reaches @limit |
| 65 | * @limit: max number of packets that can be queued across all flows |
| 66 | * @backlog: number of packets queued across all flows |
| 67 | */ |
| 68 | struct fq { |
| 69 | struct fq_flow *flows; |
| 70 | struct list_head backlogs; |
| 71 | spinlock_t lock; |
| 72 | u32 flows_cnt; |
| 73 | u32 perturbation; |
| 74 | u32 limit; |
| 75 | u32 quantum; |
| 76 | u32 backlog; |
| 77 | u32 overlimit; |
| 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 | typedef struct fq_flow *fq_flow_get_default_t(struct fq *, |
| 91 | struct fq_tin *, |
| 92 | int idx, |
| 93 | struct sk_buff *); |
| 94 | |
| 95 | #endif |