linux-kernel - Re: iwlwifi A-MSDU tx

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Message-ID: <CANUX_P0P5A6q1yQwrgagO5rVpE=6Zk0Fq2gNA-WVhkc7Ov2NdQ@mail.gmail.com>
Date:	Fri, 4 Dec 2015 10:18:10 +0200
From:	Emmanuel Grumbach <egrumbach@...il.com>
To:	Stefan Sperling <stsp@...nbsd.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: iwlwifi A-MSDU tx

On Fri, Dec 4, 2015 at 9:35 AM, Emmanuel Grumbach <egrumbach@...il.com> wrote:
> Hi,
>
> On Fri, Dec 4, 2015 at 12:05 AM, Stefan Sperling <stsp@...nbsd.org> wrote:
>> Hi Emmanuel,
>>
>> As part of implementing 802.11n support in OpenBSD I'm looking for
>> an AP which sends A-MSDUs. Preferrably under software control rather
>> than firmware.
>>
>> I found your iwlwifi A-MSDU patches at
>> http://marc.info/?l=linux-wireless&m=144553311122495&w=2
>> and http://marc.info/?l=linux-wireless&m=144553311822496&w=2
>>
>> Would these patches make it possible to run an AP with an 5300 or 7260
>> card and send A-MSDUs? That would be great as I have the necessary hardware.
>
> 7260 will go. Not 5300.
> Note that this code simulates Tx TCP Csum offload. I did that to write
> the code while we still don't have the hardware that has this
> capability. But for testing purposes, it should do the work. The
> testing teams have reported that AP mode didn't work quite well with
> this and I haven't taken the time to look into yet, but if you see
> issues, please report them or even better: fix them :)
>
>>
>> Which Linux tree do these patches apply to? I've tried the following
>> but had no luck in getting these patches applied without rejects:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next.git
>>
>
> Right. These patches had a long internal review cycle. They are now
> merge in our internal tree.
> You can find them in our internal tree [1] (backport based). I will
> push them soon in iwlwifi-next.git.

I forgot to mention that you need to change the define of
IWL_MVM_SW_TX_CSUM_OFFLOAD to 1.

>
> [1] - https://git.kernel.org/cgit/linux/kernel/git/iwlwifi/backport-iwlwifi.git/
> Please read https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi/core_release#how_to_install_the_driver.
>
>> Thanks,
>> Stefan
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