net80211 and interface requests

[Bernhard Schmidt]

On Thursday, March 31, 2011 14:20:33 Adam Stylinski wrote:
> On Thu, Mar 31, 2011 at 09:02:45AM +0200, Bernhard Schmidt wrote:
> > On Wednesday, March 30, 2011 23:17:53 Adam Stylinski wrote:
> > > Hello,
> > > 
> > > This list has helped me before so I'll email again with the hopes that
> > > somebody has an answer.  All is working well with my project, however for
> > > the life of me I cannot get the interface to inject the raw frames faster
> > > than 11mbps.  I'm following the example given in
> > > /usr/src/tools/tools/net80211/wlaninject.c, and manually specifying
> > > parameters such as ucastrate, mcastrate, and mgmtrate within ifconfig.  I'm
> > > putting the card into pureg mode, and yet I still can't inject any faster.
> > >  I've even gone so far as to specify an ieee802211_txparam struct giving
> > > values of 255 both mcast and ucast rates within the struct (and of course
> > > anding them by 0xff).  I then used the ioctl call to set the flags within
> > > the interface request.  Any help would be greatly appreciated.
> > 
> > You've set the ibp_rate0 parameter right? This one is in half-mbps, so
> > a value of 108 should give you 54m. The only thing I can think of right
> > now is that the device (or channel) is actually configured for 11b not
> > 11g mode. Can we rule that out? Which device are you using?
> > 
> > > I am doing nanosleeps in between transmissions as if I don't the bpf clone
> > > can't inject due to the buffer being too full.  There's probably a better
> > > way of doing this, but I doubt the nanosleeps are the issue (afterall, I get
> > > almost exactly 11mbps).  I should probably note I'm not doing any ACKs, this
> > > is pure transmits.
> > > 
> > > If anybody cares enough to look at my unpolished code to get a better idea,
> > > look here:
> > > 
> > > http://projhinternet.svn.sourceforge.net/
> > > 
> > > The idea is to allow unidirectional traffic so that with an FCC amateur
> > > license (yes I know I'm not currently broadcasting the call sign as of yet)
> > > you can broadcast unencrypted transmissions for miles (with a linear
> > > amplifier spec'd to 2.4ghz).  With the license FCC part15 no longer applies
> > > and you can operate just like in any other amateur band.
> > > _______________________________________________
> > > freebsd-net at freebsd.org mailing list
> > > http://lists.freebsd.org/mailman/listinfo/freebsd-net
> > > To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
> > > 
> > 
> 
> I'm using an atheros AR2413 chipset, running in pure g mode, with also the card put into "mode 11g" and ucast, mcast, and mgmt rates set to 54.  I think the parameter for ibp_rate0 is just for setting it in the header (but I could be wrong).  Regardless I am doing this, let me give you the exact source files I'm doing this in.

Well, the ath_rate_* modules afaik do not honor the fixed rate
settings. At least I've heard something about those being broken. The
ibp_rate0 parameter set to 108 seems to be correct though.

No clue why that doesn't work, you may have to debug ath_tx_findrix().
Adding a printf of the passed over rate and ridx should shed some light
on this I guess.

> Line 38 in this file:
> http://projhinternet.svn.sourceforge.net/viewvc/projhinternet/src/callbacks.c?revision=69&view=markup 
> 
> And the setup_if function in this:
> http://projhinternet.svn.sourceforge.net/viewvc/projhinternet/src/libinject.c?revision=69&view=markup
> 

-- 
Bernhard