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96 lines
2.4 KiB
Diff
96 lines
2.4 KiB
Diff
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From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 25 Nov 2020 18:03:46 +0100
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Subject: [PATCH] net/fq_impl: bulk-free packets from a flow on overmemory
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This is similar to what sch_fq_codel does. It also amortizes the worst
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case cost of a follow-up patch that changes the selection of the biggest
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flow for dropping packets
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/include/net/fq_impl.h
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+++ b/include/net/fq_impl.h
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@@ -11,17 +11,25 @@
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/* functions that are embedded into includer */
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+
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+static void
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+__fq_adjust_removal(struct fq *fq, struct fq_flow *flow, unsigned int packets,
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+ unsigned int bytes, unsigned int truesize)
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+{
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+ struct fq_tin *tin = flow->tin;
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+
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+ tin->backlog_bytes -= bytes;
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+ tin->backlog_packets -= packets;
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+ flow->backlog -= bytes;
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+ fq->backlog -= packets;
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+ fq->memory_usage -= truesize;
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+}
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+
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static void fq_adjust_removal(struct fq *fq,
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struct fq_flow *flow,
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struct sk_buff *skb)
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{
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- struct fq_tin *tin = flow->tin;
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-
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- tin->backlog_bytes -= skb->len;
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- tin->backlog_packets--;
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- flow->backlog -= skb->len;
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- fq->backlog--;
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- fq->memory_usage -= skb->truesize;
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+ __fq_adjust_removal(fq, flow, 1, skb->len, skb->truesize);
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}
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static void fq_rejigger_backlog(struct fq *fq, struct fq_flow *flow)
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@@ -59,6 +67,34 @@ static struct sk_buff *fq_flow_dequeue(s
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return skb;
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}
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+static int fq_flow_drop(struct fq *fq, struct fq_flow *flow,
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+ fq_skb_free_t free_func)
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+{
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+ unsigned int packets = 0, bytes = 0, truesize = 0;
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+ struct fq_tin *tin = flow->tin;
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+ struct sk_buff *skb;
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+ int pending;
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+
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+ lockdep_assert_held(&fq->lock);
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+
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+ pending = min_t(int, 32, skb_queue_len(&flow->queue) / 2);
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+ do {
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+ skb = __skb_dequeue(&flow->queue);
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+ if (!skb)
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+ break;
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+
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+ packets++;
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+ bytes += skb->len;
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+ truesize += skb->truesize;
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+ free_func(fq, tin, flow, skb);
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+ } while (packets < pending);
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+
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+ __fq_adjust_removal(fq, flow, packets, bytes, truesize);
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+ fq_rejigger_backlog(fq, flow);
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+
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+ return packets;
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+}
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+
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static struct sk_buff *fq_tin_dequeue(struct fq *fq,
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struct fq_tin *tin,
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fq_tin_dequeue_t dequeue_func)
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@@ -190,12 +226,9 @@ static void fq_tin_enqueue(struct fq *fq
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if (!flow)
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return;
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- skb = fq_flow_dequeue(fq, flow);
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- if (!skb)
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+ if (!fq_flow_drop(fq, flow, free_func))
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return;
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- free_func(fq, flow->tin, flow, skb);
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-
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flow->tin->overlimit++;
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fq->overlimit++;
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if (oom) {
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