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Re: [compat-masters] Backported MQ requirement on 802.11n for older kernels

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On Tue, Jun 10, 2008 at 4:57 PM, Tomas Winkler <tomasw@xxxxxxxxx> wrote:
> On Mon, Jun 9, 2008 at 1:25 PM, Luis R. Rodriguez <mcgrof@xxxxxxxxx> wrote:
>> On Mon, Jun 9, 2008 at 2:01 AM, Luis R. Rodriguez <mcgrof@xxxxxxxxx> wrote:
>>> On Mon, Jun 9, 2008 at 1:56 AM, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
>>>> On Mon, 2008-06-09 at 10:53 +0300, Ron Rindjunsky wrote:
>>>>> >
>>>>> > I just finished trying to backport CONFIG_NETDEVICES_MULTIQUEUE
>>>>> > requirement for 802.11n to older kernels by relying on the old
>>>>> > internal mac80211 hacked up MQ support. I've tested the build on
>>>>> > 2.6.22, 2.6.23, and 2.6.24. Let me know if you get to test this,
>>>>> > particularly iwl4965 using 11n on 2.6.22.
>>>>> >
>>>>>
>>>>> in config.mk you put MAC80211_QOS=m, and i guess that the intention was to put
>>>>> CONFIG_MAC80211_QOS=m
>>>>> if this is the case then the compilation fails
>>>>
>>>> It should be "y"
>>>>
>>>> johannes
>>>>
>>>
>>> Danke
>>
>> OK found some more issues. v4.2 pushed out and new tarball
>> regenerated. This has been tested by Intel on 802.11n on iwl4965.
>
> I couldn't  make wme.c compiled for kernels > 22 unless I've added the
> else statement  bellow into confg.mk
> You've reported that it worked for you so what did I wrong?
>
> ifeq ($(CONFIG_NETDEVICES_MULTIQUEUE),)
> $(warning "WARNING: You are running a kernel >= 2.6.23, you should
> enable CONFIG_NETDEVICES_MULTIQUEUE for 802.11n support")
> else
> CONFIG_MAC80211_QOS=y

Well this is forcing this option on kernels where it probably was
available. I don't recall where we added this but I was relying on
your .config. We forced this for older kernels as we are providing the
infrastructure within the code but for newer kernels you need MQ
support and NET_SCHED. If we force enable it and if those options are
not enabled it'll fail. This is why we have this big fat warning if MQ
is detected as disabled for >= 2.6.23.

Let me know what you think.

  Luis
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