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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 9:36 PM, Luis R. Rodriguez <mcgrof@xxxxxxxxx> wrote:
> On Tue, Jun 10, 2008 at 9:32 PM, Luis R. Rodriguez <mcgrof@xxxxxxxxx> wrote:
>> 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.
>
> OK I guess we should just enable it if MQ is enabled, point taken.
> Committed and pushed, thanks.

Actually no, take that back. CONFIG_MAC80211_QOS should probably just
be enabled if NET_SCHED is present.

Johannes -- why do we have the requirement for NETDEVICES_MULTIQUEUE
on CONFIG_MAC80211_QOS? My current config doesn't have it it and
CONFIG_MAC80211_QOS still works right now enabled. Of course the
driver I'm testing doesn't have 11n though.

Shouldn't we just make MAC80211_QOS depend on NET_SCHED and figure out
we can't support 11n based on NETDEVICES_MULTIQUEUE?

  Luis
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