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

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
parent a7201a6c5e
commit 506bcfa8ab
5 changed files with 84 additions and 0 deletions
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19
include/linux/ieee80211.h
View File

@ -163,6 +163,14 @@ static inline u16 ieee80211_sn_sub(u16 sn1, u16 sn2)
/* 30 byte 4 addr hdr, 2 byte QoS, 2304 byte MSDU, 12 byte crypt, 4 byte FCS */
#define IEEE80211_MAX_FRAME_LEN 2352
/* Maximal size of an A-MSDU */
#define IEEE80211_MAX_MPDU_LEN_HT_3839 3839
#define IEEE80211_MAX_MPDU_LEN_HT_7935 7935
#define IEEE80211_MAX_MPDU_LEN_VHT_3895 3895
#define IEEE80211_MAX_MPDU_LEN_VHT_7991 7991
#define IEEE80211_MAX_MPDU_LEN_VHT_11454 11454
#define IEEE80211_MAX_SSID_LEN 32
#define IEEE80211_MAX_MESH_ID_LEN 32
@ -1505,6 +1513,7 @@ struct ieee80211_vht_operation {
#define IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 0x00000000
#define IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 0x00000001
#define IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 0x00000002
#define IEEE80211_VHT_CAP_MAX_MPDU_MASK 0x00000003
#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ 0x00000004
#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ 0x00000008
#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK 0x0000000C
@ -2086,6 +2095,16 @@ enum ieee80211_tdls_actioncode {
#define WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED BIT(5)
#define WLAN_EXT_CAPA8_OPMODE_NOTIF BIT(6)
/* Defines the maximal number of MSDUs in an A-MSDU. */
#define WLAN_EXT_CAPA8_MAX_MSDU_IN_AMSDU_LSB BIT(7)
#define WLAN_EXT_CAPA9_MAX_MSDU_IN_AMSDU_MSB BIT(0)
/*
* Fine Timing Measurement Initiator - bit 71 of @WLAN_EID_EXT_CAPABILITY
* information element
*/
#define WLAN_EXT_CAPA9_FTM_INITIATOR BIT(7)
/* TDLS specific payload type in the LLC/SNAP header */
#define WLAN_TDLS_SNAP_RFTYPE 0x2

14
include/net/mac80211.h
View File

@ -1714,6 +1714,18 @@ struct ieee80211_sta_rates {
* @tdls_initiator: indicates the STA is an initiator of the TDLS link. Only
* valid if the STA is a TDLS peer in the first place.
* @mfp: indicates whether the STA uses management frame protection or not.
* @max_amsdu_subframes: indicates the maximal number of MSDUs in a single
* A-MSDU. Taken from the Extended Capabilities element. 0 means
* unlimited.
* @max_amsdu_len: indicates the maximal length of an A-MSDU in bytes. This
* field is always valid for packets with a VHT preamble. For packets
* with a HT preamble, additional limits apply:
* + If the skb is transmitted as part of a BA agreement, the
* A-MSDU maximal size is min(max_amsdu_len, 4065) bytes.
* + If the skb is not part of a BA aggreement, the A-MSDU maximal
* size is min(max_amsdu_len, 7935) bytes.
* Both additional HT limits must be enforced by the low level driver.
* This is defined by the spec (IEEE 802.11-2012 section 8.3.2.2 NOTE 2).
* @txq: per-TID data TX queues (if driver uses the TXQ abstraction)
*/
struct ieee80211_sta {
@ -1732,6 +1744,8 @@ struct ieee80211_sta {
bool tdls;
bool tdls_initiator;
bool mfp;
u8 max_amsdu_subframes;
u16 max_amsdu_len;
struct ieee80211_txq *txq[IEEE80211_NUM_TIDS];

29
net/mac80211/cfg.c
View File

@ -1131,6 +1131,34 @@ static int sta_apply_parameters(struct ieee80211_local *local,
sta->sta.max_sp = params->max_sp;
}
/* The sender might not have sent the last bit, consider it to be 0 */
if (params->ext_capab_len >= 8) {
u8 val = (params->ext_capab[7] &
WLAN_EXT_CAPA8_MAX_MSDU_IN_AMSDU_LSB) >> 7;
/* we did get all the bits, take the MSB as well */
if (params->ext_capab_len >= 9) {
u8 val_msb = params->ext_capab[8] &
WLAN_EXT_CAPA9_MAX_MSDU_IN_AMSDU_MSB;
val_msb <<= 1;
val |= val_msb;
}
switch (val) {
case 1:
sta->sta.max_amsdu_subframes = 32;
break;
case 2:
sta->sta.max_amsdu_subframes = 16;
break;
case 3:
sta->sta.max_amsdu_subframes = 8;
break;
default:
sta->sta.max_amsdu_subframes = 0;
}
}
/*
* cfg80211 validates this (1-2007) and allows setting the AID
* only when creating a new station entry
@ -1160,6 +1188,7 @@ static int sta_apply_parameters(struct ieee80211_local *local,
ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
params->ht_capa, sta);
/* VHT can override some HT caps such as the A-MSDU max length */
if (params->vht_capa)
ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
params->vht_capa, sta);

5
net/mac80211/ht.c
View File

@ -230,6 +230,11 @@ bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
/* set Rx highest rate */
ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
else
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
apply:
changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));

17
net/mac80211/vht.c
View File

@ -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)