[ath9k-devel] tx99 memory allocate failure

Hi Mathieu,

Add the monitor interface like this:

#iw phy phy0 interface add moni0 type monitor flags active


BR,
Eduardo Abinader
________________________________
From: Mathieu Slabbinck [matty.slabbinck at gmail.com]
Sent: Tuesday, May 17, 2016 4:11 PM
To: Eduardo Abinader
Cc: ath9k-devel at lists.ath9k.org
Subject: Re: [ath9k-devel] tx99 memory allocate failure

Hi Eduardo,

I'm using this:
#!/bin/bash
mount -t debugfs nodev /sys/kernel/debug

echo "Prep for tx99"
iw phy phy0 interface add moni0 type monitor
ip link set dev moni0 up

echo "Activating tx99"
echo 15 > /sys/kernel/debug/ieee80211/phy0/ath9k/tx99_power
echo 1 > /sys/kernel/debug/ieee80211/phy0/ath9k/tx99

Is that not enough?
Ifconfig lists moni0 as follows:
moni0     Link encap:UNSPEC  HWaddr BC-30-7E-BC-59-98-35-65-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B

Kr

On Tue, May 17, 2016 at 4:07 PM, Eduardo Abinader <Eduardo.Abinader at riverbed.com<mailto:[email protected]>> wrote:
Hi,

Create the monitor interface with active flag set.

BR.
________________________________
From: [email protected]<mailto:[email protected]> [ath9k-devel-bounces at lists.ath9k.org<mailto:[email protected]>] on behalf of Mathieu Slabbinck [matty.slabbinck at gmail.com<mailto:[email protected]>]
Sent: Tuesday, May 17, 2016 3:52 PM
To: ath9k-devel at lists.ath9k.org<mailto:[email protected]>
Subject: [ath9k-devel] tx99 memory allocate failure

Hi,

I'm having some issues running the tx99 features of the ath9k driver.
Seems like every time I try to run it, I get this:
sh: write error: cannot allocate memory.

After some poking, I found it's returning -ENOMEN in tx99.c.
Which is due to !sc-tx99_skb
Which on it's turn is due to an empty value for sc->tx99_vif.

So essentially, it's going wrong in ath9k_build_tx99_skb and returns NULL when checking:
if (!sc->tx99_vif) {
    return NULL;
}

Anybody some ideas on what the actual root cause can be of this and/or how to solve it?

Kernel version: 4.1.0

Thanks & Kr

Mathieu

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