Commit 5595870f authored Sep 16, 2020 by Felix Fietkau Committed by Johannes Berg Sep 18, 2020

mac80211: allow bigger A-MSDU sizes in VHT, even if HT is limited

Some APs (e.g. Asus RT-AC88U) have been observed to report an HT MSDU size
limit of 3839 and a VHT limit of 7991. These APs can handle bigger frames
than 3839 bytes just fine, so we should remove the VHT limit based on the
HT capabilities. This improves tx throughput.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20200916164611.8022-1-nbd@nbd.name

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

parent 11b34737

net/mac80211/vht.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -315,10 +315,6 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,

		sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);

		/* If HT IE reported 3839 bytes only, stay with that size. */
		if (sta->sta.max_amsdu_len == IEEE80211_MAX_MPDU_LEN_HT_3839)
		return;

		switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
		case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
		sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;