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>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index e9506eb0fd59f4f504b31d0e56b179b0bd6896da..2ab55a59d36082cc8b31a1b7ea8b47eae18388aa 100644 (file)
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -158,6 +158,14 @@ 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
@@ -1525,6 +1533,7 @@ 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_RXLDPC                               0x00000010
@@ -2105,6 +2114,16 @@ 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