mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 06:57:57 +00:00
59 lines
1.7 KiB
Diff
59 lines
1.7 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Date: Thu, 8 Mar 2018 21:00:56 +0100
|
|
Subject: [PATCH] mac80211: fix memory accounting with A-MSDU aggregation
|
|
|
|
fq uses skb->truesize for memory usage tracking. Increments/decrements
|
|
are done on enqueue/dequeue.
|
|
When A-MSDU aggregation is performed on tx side, the packet is
|
|
aggregated with the last packet in the queue belonging to the same flow.
|
|
There are multiple bugs here:
|
|
- The truesize field of the aggregated packet isn't updated, so memory
|
|
usage is underestimated
|
|
- fq->memory_usage isn't adjusted.
|
|
|
|
Because of the combination of both bugs, this only causes tx issues in
|
|
rare cases, mainly when the A-MSDU head needs to be reallocated.
|
|
|
|
Fix this by adjusting both truesize of the A-MSDU head and adding the
|
|
truesize delta to fq->memory_usage.
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/net/mac80211/tx.c
|
|
+++ b/net/mac80211/tx.c
|
|
@@ -3185,6 +3185,7 @@ static bool ieee80211_amsdu_aggregate(st
|
|
u8 max_subframes = sta->sta.max_amsdu_subframes;
|
|
int max_frags = local->hw.max_tx_fragments;
|
|
int max_amsdu_len = sta->sta.max_amsdu_len;
|
|
+ int orig_truesize;
|
|
__be16 len;
|
|
void *data;
|
|
bool ret = false;
|
|
@@ -3216,12 +3217,13 @@ static bool ieee80211_amsdu_aggregate(st
|
|
flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
|
|
head = skb_peek_tail(&flow->queue);
|
|
if (!head)
|
|
- goto out;
|
|
+ goto unlock;
|
|
|
|
+ orig_truesize = head->truesize;
|
|
orig_len = head->len;
|
|
|
|
if (skb->len + head->len > max_amsdu_len)
|
|
- goto out;
|
|
+ goto unlock;
|
|
|
|
nfrags = 1 + skb_shinfo(skb)->nr_frags;
|
|
nfrags += 1 + skb_shinfo(head)->nr_frags;
|
|
@@ -3279,6 +3281,9 @@ out_recalc:
|
|
fq_recalc_backlog(fq, tin, flow);
|
|
}
|
|
out:
|
|
+ fq->memory_usage += head->truesize - orig_truesize;
|
|
+
|
|
+unlock:
|
|
spin_unlock_bh(&fq->lock);
|
|
|
|
return ret;
|