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097b065b5c
The reusable fairness queueing implementation (fq.h) lacks the memory usage limit that the fq_codel qdisc has. This means that small devices (e.g. WiFi routers) can run out of memory when flooded with a large number of packets. This ports the memory limit feature from fq_codel to fq.h. Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*
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* Copyright (c) 2016 Qualcomm Atheros, Inc
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*
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* GPL v2
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*
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* Based on net/sched/sch_fq_codel.c
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*/
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#ifndef __NET_SCHED_FQ_H
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#define __NET_SCHED_FQ_H
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struct fq_tin;
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/**
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* struct fq_flow - per traffic flow queue
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*
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* @tin: owner of this flow. Used to manage collisions, i.e. when a packet
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* hashes to an index which points to a flow that is already owned by a
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* different tin the packet is destined to. In such case the implementer
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* must provide a fallback flow
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* @flowchain: can be linked to fq_tin's new_flows or old_flows. Used for DRR++
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* (deficit round robin) based round robin queuing similar to the one
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* found in net/sched/sch_fq_codel.c
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* @backlogchain: can be linked to other fq_flow and fq. Used to keep track of
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* fat flows and efficient head-dropping if packet limit is reached
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* @queue: sk_buff queue to hold packets
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* @backlog: number of bytes pending in the queue. The number of packets can be
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* found in @queue.qlen
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* @deficit: used for DRR++
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*/
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struct fq_flow {
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struct fq_tin *tin;
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struct list_head flowchain;
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struct list_head backlogchain;
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struct sk_buff_head queue;
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u32 backlog;
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int deficit;
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};
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/**
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* struct fq_tin - a logical container of fq_flows
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*
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* Used to group fq_flows into a logical aggregate. DRR++ scheme is used to
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* pull interleaved packets out of the associated flows.
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*
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* @new_flows: linked list of fq_flow
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* @old_flows: linked list of fq_flow
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*/
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struct fq_tin {
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struct list_head new_flows;
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struct list_head old_flows;
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u32 backlog_bytes;
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u32 backlog_packets;
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u32 overlimit;
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u32 collisions;
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u32 flows;
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u32 tx_bytes;
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u32 tx_packets;
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};
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/**
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* struct fq - main container for fair queuing purposes
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*
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* @backlogs: linked to fq_flows. Used to maintain fat flows for efficient
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* head-dropping when @backlog reaches @limit
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* @limit: max number of packets that can be queued across all flows
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* @backlog: number of packets queued across all flows
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*/
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struct fq {
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struct fq_flow *flows;
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struct list_head backlogs;
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spinlock_t lock;
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u32 flows_cnt;
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u32 perturbation;
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u32 limit;
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u32 memory_limit;
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u32 memory_usage;
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u32 quantum;
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u32 backlog;
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u32 overlimit;
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u32 overmemory;
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u32 collisions;
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};
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typedef struct sk_buff *fq_tin_dequeue_t(struct fq *,
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struct fq_tin *,
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struct fq_flow *flow);
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typedef void fq_skb_free_t(struct fq *,
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struct fq_tin *,
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struct fq_flow *,
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struct sk_buff *);
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typedef struct fq_flow *fq_flow_get_default_t(struct fq *,
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struct fq_tin *,
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int idx,
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struct sk_buff *);
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#endif
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