From: Johannes Berg <johannes@sipsolutions.net>
To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Intel Linux Wireless <ilw@linux.intel.com>,
linux-wireless@vger.kernel.org
Subject: Re: iwlwifi 6235 AGN: hardware limitation on number of stations that can connect in ap mode ?
Date: Sat, 06 Dec 2014 09:18:41 +0100 [thread overview]
Message-ID: <1417853921.2046.1.camel@sipsolutions.net> (raw)
In-Reply-To: <955277702.20141205105522@eikelenboom.it> (sfid-20141205_110059_932860_1A930067)
Hi Sander,
> So i'm wondering is there a hardware limitation of stations that can connect to
> this mini-pci card in ap-mode ?
Yes, there's a hardware/firmware limitation of 16 "station entries".
> the first clients connect perfectly well but after 12 client have connected, for
> the 13th i get:
>
> [ 784.301106] wlan0: Allocated STA 00:0d:f0:2e:ee:02
> [ 784.301117] wlan0: moving STA 00:0d:f0:2e:ee:02 to state 2
> [ 784.301122] wlan0: moving STA 00:0d:f0:2e:ee:02 to state 3
> [ 784.301141] iwlwifi 0000:00:05.0: Unable to prepare station 00:0d:f0:2e:ee:02 for addition
> [ 784.481399] iwlwifi 0000:00:05.0: Unable to add station 00:0d:f0:2e:ee:02 (-22)
> [ 784.647835] wlan0: Destroyed STA 00:0d:f0:2e:ee:02
> [ 785.828588] wlan0: Allocated STA 00:0d:f0:2e:ee:02
> [ 785.828600] wlan0: moving STA 00:0d:f0:2e:ee:02 to state 2
> [ 785.828605] wlan0: moving STA 00:0d:f0:2e:ee:02 to state 3
> [ 785.828624] iwlwifi 0000:00:05.0: Unable to prepare station 00:0d:f0:2e:ee:02 for addition
> [ 786.044379] iwlwifi 0000:00:05.0: Unable to add station 00:0d:f0:2e:ee:02 (-22)
> [ 786.219632] wlan0: Destroyed STA 00:0d:f0:2e:ee:02
Right. I'm not exactly sure why we put -EINVAL rather than -ENOSPC or
something like that, but this is a limitation.
> If it is a hardware limitation, are there any other intel mini-pci adapters that
> don't have this hardware limitation (or at least a highter one).
With the newer 7260/7265 adapters you might be able to go up to 14 or 15
stations (I haven't checked exactly), but that's not a significant
increase - the fundamental limit of 16 station entries is still there
and at least one is needed for internal tracking for multi-/broadcast
transmit transmit (and another one might be reserved for P2P on those
devices, and I might be forgetting another one perhaps which would mean
13 is the max)
I don't believe that the driver (or even firmware) would be able to work
around this.
johannes
next prev parent reply other threads:[~2014-12-06 8:18 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-05 9:55 iwlwifi 6235 AGN: hardware limitation on number of stations that can connect in ap mode ? Sander Eikelenboom
2014-12-05 15:17 ` Dan Williams
2014-12-06 8:18 ` Johannes Berg [this message]
2014-12-09 10:26 ` Sander Eikelenboom
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