| Message ID | 20230714092555.2018-1-quic_wgong@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] wifi: ath12k: trigger station disconnect on hardware restart | expand |
Wen Gong <quic_wgong@quicinc.com> wrote: > 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. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Signed-off-by: Wen Gong <quic_wgong@quicinc.com> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> This added a new warning: drivers/net/wireless/ath/ath12k/mac.c:6762: networking block comments don't use an empty /* line, use /* Comment... Please remember to run ath12k-check. I fixed this in the pending branch.
Wen Gong <quic_wgong@quicinc.com> wrote: > 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. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Signed-off-by: Wen Gong <quic_wgong@quicinc.com> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Patch applied to ath-next branch of ath.git, thanks. 68c35cc39b41 wifi: ath12k: trigger station disconnect on hardware restart
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c index ee792822b411..044a5901a2a0 100644 --- a/drivers/net/wireless/ath/ath12k/mac.c +++ b/drivers/net/wireless/ath/ath12k/mac.c @@ -6364,6 +6364,7 @@ ath12k_mac_op_reconfig_complete(struct ieee80211_hw *hw, { struct ath12k *ar = hw->priv; struct ath12k_base *ab = ar->ab; + struct ath12k_vif *arvif; int recovery_count; if (reconfig_type != IEEE80211_RECONFIG_TYPE_RESTART) @@ -6392,6 +6393,27 @@ ath12k_mac_op_reconfig_complete(struct ieee80211_hw *hw, ath12k_dbg(ab, ATH12K_DBG_BOOT, "reset success\n"); } } + + list_for_each_entry(arvif, &ar->arvifs, list) { + ath12k_dbg(ab, ATH12K_DBG_BOOT, + "reconfig cipher %d up %d vdev type %d\n", + arvif->key_cipher, + arvif->is_up, + arvif->vdev_type); + /* + * After trigger disconnect, then upper layer will + * trigger connect again, then the PN number of + * upper layer will be reset to keep up with AP + * side, hence PN number mis-match will not happened. + */ + if (arvif->is_up && + arvif->vdev_type == WMI_VDEV_TYPE_STA && + arvif->vdev_subtype == WMI_VDEV_SUBTYPE_NONE) { + ieee80211_hw_restart_disconnect(arvif->vif); + ath12k_dbg(ab, ATH12K_DBG_BOOT, + "restart disconnect\n"); + } + } } mutex_unlock(&ar->conf_mutex);
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. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 Signed-off-by: Wen Gong <quic_wgong@quicinc.com> --- v2: add code comment explaining why disconnect needs to be done. drivers/net/wireless/ath/ath12k/mac.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) base-commit: 0a00db612b6df1fad80485e3642529d1f28ea084