Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
Hi Aditya I think by changing PLL control register setting u sud b able to achieve your goal.(also u will require som sw changes) look in reg.h of ath5k /* * PHY PLL (Phase Locked Loop) control register */ #define AR5K_PHY_PLL0x987c #define AR5K_PHY_PLL_20MHZ 0x0013 /* For half rate (?) */ i have never done this bt its my understanding that this is the way. FULLRATE40 MHz core clock BW = 20Mhz HALF_RATE 20 MHz core clock BW = 10Mhz QUARTER_RATE10 MHz core clock BW = 5Mhz u sud also check legacy or Sams HAL for a better understanding. Hope this helps Shashi ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
On Thu, 2009-08-20 at 04:41 -0700, shashi raj singh wrote: Hi Aditya I think by changing PLL control register setting u sud b able to achieve your goal.(also u will require som sw changes) look in reg.h of ath5k The question is not how to do it in the chipset. The question is how to make it properly on all layers. Should we use the same channel numbers for narrow bandwidth or different channels? How should the userspace set the bandwidth? Are there any regulatory considerations? How can we integrate the new functionality smoothly with the already existing support for setting 40 MHz bandwidth for 802.11n? How should the collision avoidance work? I think linux-wirel...@vger.kernel.org would be a better place to discuss it. Once the design issues are resolved, ath5k would be probably the first driver to implement the narrow channels. But implementing a hack specific to ath5k won't be appreciated upstream. -- Regards, Pavel Roskin ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Pavel Roskin a écrit : On Thu, 2009-08-20 at 04:41 -0700, shashi raj singh wrote: Hi Aditya I think by changing PLL control register setting u sud b able to achieve your goal.(also u will require som sw changes) look in reg.h of ath5k The question is not how to do it in the chipset. The question is how to make it properly on all layers. Should we use the same channel numbers for narrow bandwidth or different channels? How should the userspace set the bandwidth? Are there any regulatory considerations? How can we integrate the new functionality smoothly with the already existing support for setting 40 MHz bandwidth for 802.11n? How should the collision avoidance work? I think linux-wirel...@vger.kernel.org would be a better place to discuss it. Once the design issues are resolved, ath5k would be probably the first driver to implement the narrow channels. But implementing a hack specific to ath5k won't be appreciated upstream. Probably adding new values to the enum nl80211_channel_type might be a good start? I think -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkqNhNEACgkQOR6EySwP7oI+tQCgkAk2yrjBskxExEhROffEbrAb FYIAn2V1eZTmNq/ZdFpsNGCmcf//dSBZ =9LCP -END PGP SIGNATURE- ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
Hi, Thanks for your prompt responses. Another member posted some time back that the 'iw' command can set the bandwidth to be 40 MHz in addition to the default 20. So I guess user-level API support is already built in for this kind of change. Don't we just need to extend it's implementation to accept bandwidths (within the ISM band) of any width? I understand there will also be regulatory concerns, but for my research work at the moment, I was wondering how many software changes (hacks) need to be done in ath5k/9k in order to make this work? Thanks regards, Aditya Bhave Pavel Roskin wrote: On Thu, 2009-08-20 at 04:41 -0700, shashi raj singh wrote: Hi Aditya I think by changing PLL control register setting u sud b able to achieve your goal.(also u will require som sw changes) look in reg.h of ath5k The question is not how to do it in the chipset. The question is how to make it properly on all layers. Should we use the same channel numbers for narrow bandwidth or different channels? How should the userspace set the bandwidth? Are there any regulatory considerations? How can we integrate the new functionality smoothly with the already existing support for setting 40 MHz bandwidth for 802.11n? How should the collision avoidance work? I think linux-wirel...@vger.kernel.org would be a better place to discuss it. Once the design issues are resolved, ath5k would be probably the first driver to implement the narrow channels. But implementing a hack specific to ath5k won't be appreciated upstream. ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
On Thu, Aug 20, 2009 at 10:16 AM, Benoit PAPILLAULTbenoit.papilla...@free.fr wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Pavel Roskin a écrit : On Thu, 2009-08-20 at 04:41 -0700, shashi raj singh wrote: Hi Aditya I think by changing PLL control register setting u sud b able to achieve your goal.(also u will require som sw changes) look in reg.h of ath5k The question is not how to do it in the chipset. The question is how to make it properly on all layers. Should we use the same channel numbers for narrow bandwidth or different channels? How should the userspace set the bandwidth? Are there any regulatory considerations? How can we integrate the new functionality smoothly with the already existing support for setting 40 MHz bandwidth for 802.11n? How should the collision avoidance work? I think linux-wirel...@vger.kernel.org would be a better place to discuss it. Once the design issues are resolved, ath5k would be probably the first driver to implement the narrow channels. But implementing a hack specific to ath5k won't be appreciated upstream. Probably adding new values to the enum nl80211_channel_type might be a good start? As Pavel noted, this needs to be talked on linux-wireless, not here. Luis ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Aditya a écrit : Hi, I am a completely newbie to ath5k. My question is: Is there a command I can use to dynamically (within a program) change the channel width of the radio between the values 5, 10, 20, 40 MHz? Thanks for your help regards, Aditya Bhave Good questions. There is a way in mac80211 to change to 40MHz versus 20 MHz with iw (iw dev wlan0 set channel 1 ht40+). For sure, it's not supported by ath5k since it does not support 802.11n. Regarding 5 and 10 MHz, I have not seen anything in mac80211 despite it's in the IEEE 802.11-2007 specifications Regards, Benoit -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkqL5k8ACgkQOR6EySwP7oLGQACg1ULl8u7xZWfoaxFBUG/YKbns 3/IAnjoAe+J1vgqeW0foIc4y5SGRrxZu =5wDo -END PGP SIGNATURE- ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
Thanks Benoit for your prompt response. So you are saying that 'ath9k' has this command, but not 'ath5k'? Can you please tell me the sections of code I need to look at in order to understand how to change the channel width? A recent SIGCOMM paper did some research on adapting channel width in wireless networks. They used Windows drivers for the Atheros chipsets and were able to program 5,10,20,40 MHz channels. No details were given apart from the hint that they manipulated the clock rate of the card. Any idea on how to do this in the present 'ath5k' or 'ath9k' code? Thanks regards, Aditya Bhave Benoit PAPILLAULT wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Aditya a écrit : Hi, I am a completely newbie to ath5k. My question is: Is there a command I can use to dynamically (within a program) change the channel width of the radio between the values 5, 10, 20, 40 MHz? Thanks for your help regards, Aditya Bhave Good questions. There is a way in mac80211 to change to 40MHz versus 20 MHz with iw (iw dev wlan0 set channel 1 ht40+). For sure, it's not supported by ath5k since it does not support 802.11n. Regarding 5 and 10 MHz, I have not seen anything in mac80211 despite it's in the IEEE 802.11-2007 specifications Regards, Benoit -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkqL5k8ACgkQOR6EySwP7oLGQACg1ULl8u7xZWfoaxFBUG/YKbns 3/IAnjoAe+J1vgqeW0foIc4y5SGRrxZu =5wDo -END PGP SIGNATURE- ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Aditya Bhave a écrit : Thanks Benoit for your prompt response. So you are saying that 'ath9k' has this command, but not 'ath5k'? Can you please tell me the sections of code I need to look at in order to understand how to change the channel width? A recent SIGCOMM paper did some research on adapting channel width in wireless networks. They used Windows drivers for the Atheros chipsets and were able to program 5,10,20,40 MHz channels. No details were given apart from the hint that they manipulated the clock rate of the card. Any idea on how to do this in the present 'ath5k' or 'ath9k' code? Thanks regards, Aditya Bhave For sure, ath5k compatible cards are able to do 5 and 10 MHz (besides 20 MHz), but I'm not sure it's supported by ath5k, nor mac80211. The same may apply to ath9k as well. I guess you need to dig into the source code yourself :-) Regards, Benoit -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkqMLqQACgkQOR6EySwP7oIfMgCeMoZcMARFnFJVqKFQGW24fgQL qtkAoIaPYzPcKMMfA39MyoFa6hrqYei0 =qO20 -END PGP SIGNATURE- ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
On Wed, Aug 19, 2009 at 12:56 PM, Benoit PAPILLAULTbenoit.papilla...@free.fr wrote: For sure, ath5k compatible cards are able to do 5 and 10 MHz (besides 20 MHz), but I'm not sure it's supported by ath5k, nor mac80211. The same may apply to ath9k as well. I guess you need to dig into the source code yourself :-) I'm pretty sure that it is not currently supported, but Pat Erley is working on it. See: http://marc.info/?l=linux-wirelessm=124917094707512w=2 -- Bob Copeland %% www.bobcopeland.com ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
Re: [ath5k-devel] Regarding how to change channel width for 802.11a/b/g
On Wed, Aug 19, 2009 at 10:12:01AM -0700, Bob Copeland wrote: On Wed, Aug 19, 2009 at 12:56 PM, Benoit PAPILLAULTbenoit.papilla...@free.fr wrote: For sure, ath5k compatible cards are able to do 5 and 10 MHz (besides 20 MHz), but I'm not sure it's supported by ath5k, nor mac80211. The same may apply to ath9k as well. I guess you need to dig into the source code yourself :-) I'm pretty sure that it is not currently supported, but Pat Erley is working on it. See: http://marc.info/?l=linux-wirelessm=124917094707512w=2 This is currently not supported by mac80211/cfg80211 but such work is greatly welcomed, specially if you follow standards. Luis ___ ath5k-devel mailing list ath5k-devel@lists.ath5k.org https://lists.ath5k.org/mailman/listinfo/ath5k-devel
