ath10k: Trigger sta disconnect on hardware restart

Currently after the hardware restart triggered from the driver,
the station interface connection remains intact, since a disconnect
trigger is not sent to userspace. This can lead to a problem in
targets where the wifi mac sequence is added by the firmware.

After the target restart, its wifi mac sequence number gets
reset to zero. Hence AP to which our device is connected will receive
frames with a  wifi mac sequence number jump to the past, thereby
resulting in the AP dropping all these frames, until the frame
arrives with a wifi mac sequence number which AP was expecting.

To avoid such frame drops, its better to trigger a station disconnect
upon target hardware restart which can be done with API
ieee80211_reconfig_disconnect exposed to mac80211.

The other targets are not affected by this change, since the hardware
params flag is not set.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1
Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00110-QCARMSWP-1
Tested-on: QCA6174 hw3.2 SDIO WLAN.RMH.4.4.1-00048

Signed-off-by: Youghandhar Chintala <youghand@codeaurora.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220315082944.12406-3-youghand@codeaurora.org

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 9e1f483e1362a827b892afb3a7a373377f6f59ed..2092bfd02cd1cec3bc0f39d81a2f883b59b7f2e2 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -94,6 +94,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = true,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA988X_HW_2_0_VERSION,
@@ -131,6 +132,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = true,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA9887_HW_1_0_VERSION,
@@ -169,6 +171,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA6174_HW_3_2_VERSION,
@@ -202,6 +205,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .bmi_large_size_download = true,
                .supports_peer_stats_info = true,
                .dynamic_sar_support = true,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA6174_HW_2_1_VERSION,
@@ -239,6 +243,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA6174_HW_2_1_VERSION,
@@ -276,6 +281,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA6174_HW_3_0_VERSION,
@@ -313,6 +319,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA6174_HW_3_2_VERSION,
@@ -354,6 +361,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .tx_stats_over_pktlog = false,
                .supports_peer_stats_info = true,
                .dynamic_sar_support = true,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA99X0_HW_2_0_DEV_VERSION,
@@ -397,6 +405,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA9984_HW_1_0_DEV_VERSION,
@@ -447,6 +456,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA9888_HW_2_0_DEV_VERSION,
@@ -494,6 +504,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA9377_HW_1_0_DEV_VERSION,
@@ -531,6 +542,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA9377_HW_1_1_DEV_VERSION,
@@ -570,6 +582,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA9377_HW_1_1_DEV_VERSION,
@@ -600,6 +613,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .uart_pin_workaround = true,
                .credit_size_workaround = true,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = QCA4019_HW_1_0_DEV_VERSION,
@@ -644,6 +658,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = false,
+               .hw_restart_disconnect = false,
        },
        {
                .id = WCN3990_HW_1_0_DEV_VERSION,
@@ -674,6 +689,7 @@ static const struct ath10k_hw_params ath10k_hw_params_list[] = {
                .credit_size_workaround = false,
                .tx_stats_over_pktlog = false,
                .dynamic_sar_support = true,
+               .hw_restart_disconnect = true,
        },
 };
 
@@ -2442,6 +2458,7 @@ EXPORT_SYMBOL(ath10k_core_napi_sync_disable);
 static void ath10k_core_restart(struct work_struct *work)
 {
        struct ath10k *ar = container_of(work, struct ath10k, restart_work);
+       struct ath10k_vif *arvif;
        int ret;
 
        set_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags);
@@ -2480,6 +2497,14 @@ static void ath10k_core_restart(struct work_struct *work)
                ar->state = ATH10K_STATE_RESTARTING;
                ath10k_halt(ar);
                ath10k_scan_finish(ar);
+               if (ar->hw_params.hw_restart_disconnect) {
+                       list_for_each_entry(arvif, &ar->arvifs, list) {
+                               if (arvif->is_up &&
+                                   arvif->vdev_type == WMI_VDEV_TYPE_STA)
+                                       ieee80211_hw_restart_disconnect(arvif->vif);
+                       }
+               }
+
                ieee80211_restart_hw(ar->hw);
                break;
        case ATH10K_STATE_OFF:

diff --git a/drivers/net/wireless/ath/ath10k/hw.h b/drivers/net/wireless/ath/ath10k/hw.h
index 5215a6816d71876f6c804d887fee792ac7c4fd7f..93acf0dd580a6f0f5e076fb6d6106887c39791ef 100644 (file)
--- a/drivers/net/wireless/ath/ath10k/hw.h
+++ b/drivers/net/wireless/ath/ath10k/hw.h
@@ -633,6 +633,8 @@ struct ath10k_hw_params {
        bool supports_peer_stats_info;
 
        bool dynamic_sar_support;
+
+       bool hw_restart_disconnect;
 };
 
 struct htt_resp;