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mac80211: AMPDU handling for rekeys with Extended Key ID

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Extended Key ID allows A-MPDU sessions while rekeying as long as each
A-MPDU aggregates only MPDUs with one keyid together.

Drivers able to segregate MPDUs accordingly can tell mac80211 to not
stop A-MPDU sessions when rekeying by setting the new flag
IEEE80211_HW_AMPDU_KEYBORDER_SUPPORT.

Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
Link: https://lore.kernel.org/r/20190629195015.19680-3-alexander@wetzel-home.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alexander Wetzel 2019-06-29 21:50:14 +02:00 committed by Johannes Berg
parent 3e47bf1ca4
commit dc3998ec5c
3 changed files with 14 additions and 6 deletions
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5
include/net/mac80211.h
View File

@ -2268,6 +2268,10 @@ struct ieee80211_txq {
* @IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID: Hardware supports multi BSSID
* only for HE APs. Applies if @IEEE80211_HW_SUPPORTS_MULTI_BSSID is set.
*
* @IEEE80211_HW_AMPDU_KEYBORDER_SUPPORT: The card and driver is only
* aggregating MPDUs with the same keyid, allowing mac80211 to keep Tx
* A-MPDU sessions active while rekeying with Extended Key ID.
*
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@ -2319,6 +2323,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN,
IEEE80211_HW_SUPPORTS_MULTI_BSSID,
IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID,
IEEE80211_HW_AMPDU_KEYBORDER_SUPPORT,
/* keep last, obviously */
NUM_IEEE80211_HW_FLAGS

1
net/mac80211/debugfs.c
View File

@ -271,6 +271,7 @@ static const char *hw_flag_names[] = {
FLAG(TX_STATUS_NO_AMPDU_LEN),
FLAG(SUPPORTS_MULTI_BSSID),
FLAG(SUPPORTS_ONLY_HE_MULTI_BSSID),
FLAG(AMPDU_KEYBORDER_SUPPORT),
#undef FLAG
};

14
net/mac80211/key.c
View File

@ -270,7 +270,8 @@ int ieee80211_set_tx_key(struct ieee80211_key *key)
sta->ptk_idx = key->conf.keyidx;
clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
if (!ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
ieee80211_check_fast_xmit(sta);
return 0;
@ -288,15 +289,16 @@ static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
/* Extended Key ID key install, initial one or rekey */
if (sta->ptk_idx != INVALID_PTK_KEYIDX) {
if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
!ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
/* Aggregation Sessions with Extended Key ID must not
* mix MPDUs with different keyIDs within one A-MPDU.
* Tear down running Tx aggregation sessions and block
* new Rx/Tx aggregation requests during rekey to
* ensure there are no A-MPDUs for the driver to
* aggregate. (Blocking Tx only would be sufficient but
* WLAN_STA_BLOCK_BA gets the job done for the few ms
* we need it.)
* ensure there are no A-MPDUs when the driver is not
* supporting A-MPDU key borders. (Blocking Tx only
* would be sufficient but WLAN_STA_BLOCK_BA gets the
* job done for the few ms we need it.)
*/
set_sta_flag(sta, WLAN_STA_BLOCK_BA);
mutex_lock(&sta->ampdu_mlme.mtx);