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mac80211: do not convert to A-MSDU if frag/subframe limited 

Do not start to aggregate packets in a A-MSDU frame (converting the
first subframe to A-MSDU, adding the header) if max_tx_fragments or
max_amsdu_subframes limits are already exceeded by it. In particular,
this happens when drivers set the limit to 1 to avoid A-MSDUs at all.

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
[reword commit message to be more precise]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Lorenzo Bianconi 2018-08-29 21:03:25 +02:00 committed by Johannes Berg
parent 4f0223bfe9
commit 1eb5079036
1 changed files with 3 additions and 3 deletions
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6
net/mac80211/tx.c
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@ -3208,9 +3208,6 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
if (skb->len + head->len > max_amsdu_len)
goto out;
if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
goto out;
nfrags = 1 + skb_shinfo(skb)->nr_frags;
nfrags += 1 + skb_shinfo(head)->nr_frags;
frag_tail = &skb_shinfo(head)->frag_list;
@ -3226,6 +3223,9 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
if (max_frags && nfrags > max_frags)
goto out;
if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
goto out;
/*
* Pad out the previous subframe to a multiple of 4 by adding the
* padding to the next one, that's being added. Note that head->len