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fq.h: Port memory limit mechanism from fq_codel 

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>
This commit is contained in:
Toke Høiland-Jørgensen 2016-09-23 21:59:09 +02:00 committed by Johannes Berg
parent 92bc43bce2
commit 097b065b5c
2 changed files with 9 additions and 1 deletions
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3
include/net/fq.h
View File

@ -72,9 +72,12 @@ struct fq {
u32 flows_cnt;
u32 perturbation;
u32 limit;
u32 memory_limit;
u32 memory_usage;
u32 quantum;
u32 backlog;
u32 overlimit;
u32 overmemory;
u32 collisions;
};

7
include/net/fq_impl.h
View File

@ -29,6 +29,7 @@ static struct sk_buff *fq_flow_dequeue(struct fq *fq,
tin->backlog_packets--;
flow->backlog -= skb->len;
fq->backlog--;
fq->memory_usage -= skb->truesize;
if (flow->backlog == 0) {
list_del_init(&flow->backlogchain);
@ -154,6 +155,7 @@ static void fq_tin_enqueue(struct fq *fq,
flow->backlog += skb->len;
tin->backlog_bytes += skb->len;
tin->backlog_packets++;
fq->memory_usage += skb->truesize;
fq->backlog++;
fq_recalc_backlog(fq, tin, flow);
@ -166,7 +168,7 @@ static void fq_tin_enqueue(struct fq *fq,
__skb_queue_tail(&flow->queue, skb);
if (fq->backlog > fq->limit) {
if (fq->backlog > fq->limit || fq->memory_usage > fq->memory_limit) {
flow = list_first_entry_or_null(&fq->backlogs,
struct fq_flow,
backlogchain);
@ -181,6 +183,8 @@ static void fq_tin_enqueue(struct fq *fq,
flow->tin->overlimit++;
fq->overlimit++;
if (fq->memory_usage > fq->memory_limit)
fq->overmemory++;
}
}
@ -251,6 +255,7 @@ static int fq_init(struct fq *fq, int flows_cnt)
fq->perturbation = prandom_u32();
fq->quantum = 300;
fq->limit = 8192;
fq->memory_limit = 16 << 20; /* 16 MBytes */
fq->flows = kcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
if (!fq->flows)