Hi Shay, > It's useful in case you need to be able to support 160Mhz BW but only at 1/2 NSS > (the 2nd row in Table 9-272 of "IEEE P802.11-REVmdTM/D3.0, October 2019") It'd help to write the table caption too - in this case I found the exact same document and it's "Setting of the Supported Channel Width Set subfield and Extended NSS BW Support subfield at a STA transmitting the VHT Capabilities Information Field" ... OK what a mouthful :) Anyway, you're making my point ;-) If you look at the second row, you'll note that in this case you have to put the "Location of 160 MHz channel center frequency if BSS bandwidth is 160 MHz" into CCFS2 (see second-to-last column), so having just this bit isn't enough. Also, we should then have the ability to also set the "Extended NSS BW Support" field to 2/3, not just 1, and probably then automatically encode everything according to this table, i.e. setting CCFS2 etc. In fact, I'd argue we need to be able to have the *driver* advertise this NSS restriction (1/2, 3/4) in the VHT capabilities in nl80211, and then hostapd build everything according to this table automatically? johannes > In this case, you need to set bit30 (Extended NSS BW Support) of VHT Capabilities Information field. > > -----Original Message----- > From: Johannes Berg <johannes@xxxxxxxxxxxxxxxx> > Sent: Thursday, 26 March 2020 16:27 > To: Shay Bar <Shay.Bar@xxxxxxxxxx>; hostap@xxxxxxxxxxxxxxxxxxx > Cc: Eliav Farber <Eliav.Farber@xxxxxxxxxx> > Subject: Re: [PATCH] Add Extended NSS BW Support > > External Email > > > On Thu, 2020-03-26 at 15:57 +0200, Shay Bar wrote: > > Based on IEEE P802.11-REVmdTM/D3.0, October 2019 > > section 9.4.2.157.2 VHT Capabilities Information field > > Hmm. How's this useful if you cannot set CF2 etc.? > > johannes > > > ---------- > > This email has been scanned for spam and viruses by Proofpoint Essentials. Visit the following link to report this email as spam: > https://eu1.proofpointessentials.com/index01.php?mod_id=11&mod_option=logitem&mail_id=1585232810-kfA4zDF1zYZC&r_address=shay.bar%40celeno.com&report=1 > > ________________________________ > The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any retransmission, dissemination, copying or other use of, or taking of any action in reliance upon this information is prohibited. If you received this in error, please contact the sender and delete the material from any computer. Nothing contained herein shall be deemed as a representation, warranty or a commitment by Celeno. No warranties are expressed or implied, including, but not limited to, any implied warranties of non-infringement, merchantability and fitness for a particular purpose. > ________________________________ > _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
