[PATCH v5] cfg80211: save power spectral density(psd) of regulatory rule
Wen Gong
wgong at codeaurora.org
Sun Oct 10 21:06:10 PDT 2021
On 2021-09-30 20:50, Johannes Berg wrote:
> On Thu, 2021-09-30 at 10:53 +0800, Wen Gong wrote:
>> > >
>> > > chan->max_reg_power =
>> > > min_t(int, MBM_TO_DBM(power_rule1->max_eirp),
>> > > MBM_TO_DBM(power_rule2->max_eirp));
>> > >
>> > > For AP + STA concurrency, it should to maintain 2 group of reg rules,
>> > > one is for AP, another is for STA.
>> >
>> > Can we maintain two power rules in the same channel one for AP and one
>> > for STA. In this way, we can update the power rules in the same
>> > channel for both AP and STA from the reg rules.
>> >
>> > Otherwise, we need to maintain multiple channel lists in sband for all
>> > supported power mode combinations to apply the respective power rules
>> > and build channel flags from the multiple reg rules.
>> > right?
>>
>> If AP+STA is up in the same wiphy/ieee80211_hw, and AP's reg rules is
>> different
>> with STA, then it should maintain muti channel list for each band of
>> the
>> wiphy/ieee80211_hw by my understand.
>
> I don't think that's how it works. You can today have AP/STA
> concurrency
> on a single wiphy with different netdevs, even with mesh or whatever.
>
>> Currently there is only one "struct ieee80211_supported_band
>> *bands[NUM_NL80211_BANDS]"
>> in "struct wiphy".
>>
>> I advise to discuss the AP + STA concurrency in another mail thread
>> since it is not relative with this patch.
>
> I actually explicitly pointed to this thread, but I'm not sure it's so
> clear cut?
>
> If we have completely separate rules here for AP and STA, we probably
> should have different "max_reg_power" values for AP and STA? Maybe mesh
> is treated like AP, maybe not?
>
> But I don't know - does PSD really differ between AP and STA?
>
> Maybe this discussion belongs rather to the power type patch? But that
> didn't add any state!
>
>
> So - does this PSD depend on mode? It kind of seems like it shouldn't
> and then this *isn't* the right place to be discussing this, but if PSD
> does in fact depend on the mode then we should be discussing it here?
>
> Venkatesh seemed to be worried more about LPI/client power etc. as in
> commit 405fca8a9461 ("ieee80211: add power type definition for 6 GHz"),
> but that doesn't add state?
>
> So what gives? From a regulatory POV it seems PSD should be
> independent,
> but some other things might be dependent on mode?
>
As I know, below values maybe all different for the AP and
STATION in the same wiphy/ieee80211_hw, not only PSD.
struct ieee80211_reg_rule {
struct ieee80211_freq_range freq_range;
struct ieee80211_power_rule power_rule;
struct ieee80211_wmm_rule wmm_rule;
u32 flags;
u32 dfs_cac_ms;
bool has_wmm;
s8 psd;
};
@Venkateswara, please feel free to give more info to Johannes:)
> johannes
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