linux-kernel - [PATCH 1/3] cfg80211: Add wiphy flag to trigger STA disconnect after hardware restart

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Message-Id: <20201215172133.5111-1-youghand@codeaurora.org>
Date:   Tue, 15 Dec 2020 22:51:33 +0530
From:   Youghandhar Chintala <youghand@...eaurora.org>
To:     johannes@...solutions.net
Cc:     davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kuabhs@...omium.org,
        dianders@...omium.org, briannorris@...omium.org,
        pillair@...eaurora.org,
        Youghandhar Chintala <youghand@...eaurora.org>
Subject: [PATCH 1/3] cfg80211: Add wiphy flag to trigger STA disconnect after hardware restart

Many wifi drivers (e.g. ath10k using qualcomm wifi chipsets)
support silent target hardware restart/recovery. Out of these
drivers which support target hw restart, certain chipsets
have the wifi mac sequence number addition for transmitted
frames done by the firmware. For such chipsets, a silent
target hardware restart breaks the continuity of the wifi
mac sequence number, since the wifi mac sequence number
restarts from 0 after the restart, which in-turn leads
to the peer access point dropping all the frames from device
until it receives the frame with the mac sequence which was
expected by the AP.

Add a wiphy flag for the driver to indicate that it needs a
trigger for STA disconnect after hardware restart.

Tested on ath10k using WCN3990, QCA6174.

Signed-off-by: Youghandhar Chintala <youghand@...eaurora.org>
---
 include/net/cfg80211.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index ab249ca..7fba6f6 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -4311,6 +4311,9 @@ struct cfg80211_ops {
  * @WIPHY_FLAG_HAS_STATIC_WEP: The device supports static WEP key installation
  *	before connection.
  * @WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK: The device supports bigger kek and kck keys
+ * @WIPHY_FLAG_STA_DISCONNECT_ON_HW_RESTART: The device needs a trigger to
+ *	disconnect STA after target hardware restart. This flag should be
+ *	exposed by drivers which support target recovery.
  */
 enum wiphy_flags {
 	WIPHY_FLAG_SUPPORTS_EXT_KEK_KCK		= BIT(0),
@@ -4337,6 +4340,7 @@ enum wiphy_flags {
 	WIPHY_FLAG_SUPPORTS_5_10_MHZ		= BIT(22),
 	WIPHY_FLAG_HAS_CHANNEL_SWITCH		= BIT(23),
 	WIPHY_FLAG_HAS_STATIC_WEP		= BIT(24),
+	WIPHY_FLAG_STA_DISCONNECT_ON_HW_RESTART	= BIT(25),
 };

 /**
-- 
2.7.4