On Wed, Jun 19, 2019 at 03:49:11PM +0300, Andrei Otcheretianski wrote:
> Add support for new hardware mode for 6GHz band. 6GHz operation is
> defined in "Draft IEEE P802.11ax/D4.1".
> 6GHz band adds 131-135 operating classes that define channels in
> frequency range from 5940MHz to 7105MHz.
> diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
> @@ -147,7 +147,8 @@ ssid=test
> # Operation mode (a = IEEE 802.11a (5 GHz), b = IEEE 802.11b (2.4 GHz),
> # g = IEEE 802.11g (2.4 GHz), ad = IEEE 802.11ad (60 GHz); a/g options are used
> # with IEEE 802.11n (HT), too, to specify band). For IEEE 802.11ac (VHT), this
> -# needs to be set to hw_mode=a. When using ACS (see channel parameter), a
> +# needs to be set to hw_mode=a. For IEEE 802.11ax (HE) on 6-7 GHz this needs
> +# to be set to hw_mode=ax. When using ACS (see channel parameter), a
This feels pretty confusing. Why would hw_mode=ax be used for the 6 GHz
band while all other cases of 802.11ax would not use hw_mode=ax? I'd
much rather continue using hw_mode=a for these and instead of trying to
encode the band somehow in the not exactly clear hw_mode, add a new
configuration parameter op_class that takes the global operating class
number (Table E-4 in the standard) to get the op_class,channel pair to
define the channel.
> # HE operating channel information; see matching vht_* parameters for details.
> +# On 6GHz band (hw_mode=ax) the center freq calculation starts from 5.940 offset.
> +# For example idx=3 would result in 5955MHz center frequency. In addition,
> +# he_oper_chwidth is ignored, and the channel width is derived from the
> +# configured center frequencies (See IEEE802.11ax/D4.1 Annex E)
The bandwidth should really be from the op_class,channel pair, not
center frequency, so this is yet another justification for adding
op_class instead of trying to extend hw_mode.
> diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
> @@ -158,6 +158,7 @@ int hostapd_prepare_rates(struct hostapd_iface *iface,
> else switch (mode->mode) {
> case HOSTAPD_MODE_IEEE80211A:
> + case HOSTAPD_MODE_IEEE80211AX: /* same as 5GHz */
Just like this type of cases where hw_mode=a would really be usable
as-is.
--
Jouni Malinen PGP id EFC895FA
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