Re: RTL8192CU continually reconnecting

[Larry Finger <Larry.Finger@lwfinger.net>]

[-- Attachment #1: Type: text/plain, Size: 968 bytes --]

On 09/09/2013 12:29 PM, Mark Cave-Ayland wrote:
> Please find the attached dmesg output from my current environment which is
> Linus' git commit 6a7492a4b2e05051a44458d7187023e22d580666 along with your
> beacon patch.
>
> Does that help provide any further insight? To my untrained eye, it really looks
> as if I'm not getting beacons every 6s as suggested by the comments in base.c.
>
> (Feel free to CC any replies back to the list if you're happy no secrets are
> being revealed)

There were no secrets in that dump, but it did reveal a major clue.

A response from your system for your AP was:

mode 2, state 0, is_beacon 0, is_probe_resp 1, length 147

For the number of beacons to be updated, the state has to be 2 or 3. My system 
has scan_ssid=1 in the wpa_supplicant configuration file. When the scan 
finishes, then a value of 2 is set into the mode variable.

The attached updated patch should set the correct mode even if scanning is not 
enabled.

Larry


[-- Attachment #2: rtl8192cu_dump_AP_off --]
[-- Type: text/plain, Size: 1781 bytes --]

Index: wireless-testing-save/drivers/net/wireless/rtlwifi/base.c
===================================================================
--- wireless-testing-save.orig/drivers/net/wireless/rtlwifi/base.c
+++ wireless-testing-save/drivers/net/wireless/rtlwifi/base.c
@@ -1287,7 +1287,13 @@ void rtl_beacon_statistic(struct ieee802
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	static int count;
 
+	if (count++ < 100) {
+		pr_info("mode %d, state %d, is_beacon %d, is_probe_resp %d, length %d, MAC %pM\n",
+			rtlpriv->mac80211.opmode, rtlpriv->mac80211.link_state, ieee80211_is_beacon(hdr->frame_control),
+			ieee80211_is_probe_resp(hdr->frame_control), skb->len, hdr->addr3);
+	}
 	if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION)
 		return;
 
Index: wireless-testing-save/drivers/net/wireless/rtlwifi/usb.c
===================================================================
--- wireless-testing-save.orig/drivers/net/wireless/rtlwifi/usb.c
+++ wireless-testing-save/drivers/net/wireless/rtlwifi/usb.c
@@ -484,6 +484,8 @@ static void _rtl_usb_rx_process_agg(stru
 			if (unicast)
 				rtlpriv->link_info.num_rx_inperiod++;
 		}
+		/* static bcn for roaming */
+		rtl_beacon_statistic(hw, skb);
 	}
 }
 
Index: wireless-testing-save/drivers/net/wireless/rtlwifi/core.c
===================================================================
--- wireless-testing-save.orig/drivers/net/wireless/rtlwifi/core.c
+++ wireless-testing-save/drivers/net/wireless/rtlwifi/core.c
@@ -184,6 +184,7 @@ static int rtl_op_add_interface(struct i
 					rtlpriv->cfg->maps
 					[RTL_IBSS_INT_MASKS]);
 		}
+		mac->link_state = MAC80211_LINKED;
 		break;
 	case NL80211_IFTYPE_ADHOC:
 		RT_TRACE(rtlpriv, COMP_MAC80211, DBG_LOUD,