netdev - [PATCH 3/7] staging: wfx: fix BA sessions for older firmwares

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Date:   Wed,  7 Oct 2020 12:19:39 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH 3/7] staging: wfx: fix BA sessions for older firmwares

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

Firmwares with API < 3.6 do not forward DELBA requests. Thus, when a
Block Ack session is restarted, the reordering buffer is not flushed and
the received sequence number is not contiguous. Therefore, mac80211
starts to wait some missing frames that it will never receive.

This patch disables the reordering buffer for old firmware. It is
harmless when the network is unencrypted. When the network is encrypted,
the non-contiguous frames will be thrown away by the TKIP/CCMP replay
protection. So, the user will observe some packet loss with UDP and
performance drop with TCP.

Fixes: e5da5fbd7741 ("staging: wfx: fix CCMP/TKIP replay protection")
Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/data_rx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/wfx/data_rx.c b/drivers/staging/wfx/data_rx.c
index 86781098edc0..3822a22b9fe3 100644
--- a/drivers/staging/wfx/data_rx.c
+++ b/drivers/staging/wfx/data_rx.c
@@ -17,6 +17,9 @@ static void wfx_rx_handle_ba(struct wfx_vif *wvif, struct ieee80211_mgmt *mgmt)
 {
 	int params, tid;

+	if (wfx_api_older_than(wvif->wdev, 3, 6))
+		return;
+
 	switch (mgmt->u.action.u.addba_req.action_code) {
 	case WLAN_ACTION_ADDBA_REQ:
 		params = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
-- 
2.28.0