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mac80211: limit the A-MSDU Tx based on peer's capabilities

Telusuri Sumber 
In VHT, the specification allows to limit the number of
MSDUs in an A-MSDU in the Extended Capabilities IE. There
is also a limitation on the byte size in the VHT IE.
In HT, the only limitation is on the byte size.
Parse the capabilities from the peer and make them
available to the driver.

In HT, there is another limitation when a BA agreement
is active: the byte size can't be greater than 4095.
This is not enforced here.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Emmanuel Grumbach
2015-12-13 15:41:05 +02:00
committed by Johannes Berg
orang tua a7201a6c5e
melakukan 506bcfa8ab
5 mengubah file dengan 84 tambahan dan 0 penghapusan
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17
net/mac80211/vht.c
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@@ -281,6 +281,23 @@ 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;
break;
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
break;
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
default:
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
break;
}
}
enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta)