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* [ath9k-devel] Looking for help while using Ath9k to make multi virtual station
@ 2014-11-06  4:47 小伦子
  2014-11-06  5:04 ` Ben Greear
  0 siblings, 1 reply; 2+ messages in thread
From: 小伦子 @ 2014-11-06  4:47 UTC (permalink / raw)
  To: ath9k-devel

Dear ALL:
        I am tring to use ath9k driver with AR9380 chips to make multi virtual station to connect to an ap.Here is the problem i have meet.
        I am using linux kernel 3.14.8 #14 SMP PREEMPT?
        As the (http://www.candelatech.com/vsta.php) web suggest i create vif and using wpa_supplicant to connect to the ap. Then i got some very strange problem : 
        1. the AR9380 is support ht_40 and the ap i got is support ht_40 too, but i can't connect with in 300Mbps, all i can connect is 150Mbps. i have google the same problem that find out in kernel 3.8 seems have the problem in intel card(https://bugzilla.kernel.org/show_bug.cgi?id=54851#c17,https://bbs.archlinux.org/viewtopic.php?id=161056).??
        
        2. system is getting very slow and the kernel memory kmalloc-4096 object was increase very fast , the system's memory was running out very quick. so i dig the kernel code and find out that every one phy receive pkt will copy to each vif in /net/mac80211/rx.c:3211 so i change it to skb_clone, it seems the system went well and the kmalloc-4096 object is not increase that fast, memory looks ok.But i don't known is that i am right to make that change? and it seems that it bring another problem to me (problems 3)???
kernel/linux-3.14.dev.y/net/mac80211/rx.c?
@@ -3208,7 +3208,11 @@
32083208 		return false;
32093209  
32103210 	if (!consume) {
3211 -		skb = skb_copy(skb, GFP_ATOMIC);
 3211+		//skb = skb_copy(skb, GFP_ATOMIC);
 3212+        // here get a bug if skb_copy over memory use
 3213+        // if kernel never change this pkt is ok for clone
 3214+        // woolen
 3215+		skb = skb_clone(skb, GFP_ATOMIC);
32123216 		if (!skb) {
32133217 			if (net_ratelimit())
32143218 				wiphy_debug(local->hw.wiphy, ?

         3. when i use the change i make in problem 2, i use 7 AR9380 card connect to 24 aps each one ap connects 60 vif stations.Each card phy make 240 sta, while the wpa_supplicant start to connect to the ap ,the driver get some error message :
tx hung, queue: %i axq-depth: %i, ampdu-depth: %i resetting the chip.?
i found the message in kernel/drivers/net/wireless/ath/ath9k/link.c : 46. it seems like while tx process the hardware didn't push the pkt out to the ap.This problem almost make me crazy. I have try many way to fix( ignore the hung and continue, reinvoke the tx pkt tasklet to tx the pkt and then reset chips) but faile.So i am ask for help~! ?


        the attach is some env info.


       Thank you all
------------------
 ???  Mail:Just_woolen at qq.com
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2014-11-06  4:47 [ath9k-devel] Looking for help while using Ath9k to make multi virtual station 小伦子
2014-11-06  5:04 ` Ben Greear

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