P2P GO operating channel width

Arend van Spriel arend at broadcom.com
Mon May 12 09:26:23 EDT 2014


Hi Johannes, Jouni,

I was wondering how to configure the bandwidth of the operating channel 
in P2P-GO scenario. In nl80211.c I do see the use of .set_ap_chanwidth() 
callback. Reading the spec it seems the operating channel is exchanged 
during GO negotiation, but I do not see any reference about the 
bandwidth. It does exchange the operating class and I found some info in 
p2p_supplicant.c (see below). I am just not sure how this is configured 
to the driver, ie. what nl80211 commands will be used.

Gr. AvS
--8<------------------------------------------------------------
static struct p2p_oper_class_map op_class[] = {
	{ HOSTAPD_MODE_IEEE80211G, 81, 1, 13, 1, BW20 },
#if 0 /* Do not enable HT40 on 2 GHz for now */
	{ HOSTAPD_MODE_IEEE80211G, 83, 1, 9, 1, BW40PLUS },
	{ HOSTAPD_MODE_IEEE80211G, 84, 5, 13, 1, BW40MINUS },
#endif
	{ HOSTAPD_MODE_IEEE80211A, 115, 36, 48, 4, BW20 },
	{ HOSTAPD_MODE_IEEE80211A, 124, 149, 161, 4, BW20 },
	{ HOSTAPD_MODE_IEEE80211A, 116, 36, 44, 8, BW40PLUS },
	{ HOSTAPD_MODE_IEEE80211A, 117, 40, 48, 8, BW40MINUS },
	{ HOSTAPD_MODE_IEEE80211A, 126, 149, 157, 8, BW40PLUS },
	{ HOSTAPD_MODE_IEEE80211A, 127, 153, 161, 8, BW40MINUS },
	{ HOSTAPD_MODE_IEEE80211A, 128, 36, 161, 4, BW80 },
	{ -1, 0, 0, 0, 0, BW20 }
};


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