Re: wifi: mac80211: mlo rx nss value 0 of wifi

[Wen Gong <quic_wgong@quicinc.com>]

On 10/17/2022 3:49 PM, Johannes Berg wrote:
> On Mon, 2022-10-17 at 09:48 +0200, Johannes Berg wrote:
>> Hi,
>>
>>>> Currently for MLO test, the others links's rx_nss of struct
>>>> ieee80211_link_sta is still value 0 in ieee80211_set_associated(),
>>>> becaue they are not pass into ieee80211_sta_set_rx_nss() in
>>>> mac80211 except the deflink which means the primary link in
>>>> rate_control_rate_init(). This lead driver get nss = 0 for
>>>> other links. Will you fix it or is it design by default?
>>>>
>>>> Only primary link has valid rx_nss value which is not 0 by below call
>>>> stack.
>>>> ieee80211_assoc_success()
>>>>      ->rate_control_rate_init(sta);
>>>>          ->ieee80211_sta_set_rx_nss(&sta->deflink);
>> Right, none of the rate scaling related stuff was updated yet.
>>
> Though for this case maybe we can just move ieee80211_sta_set_rx_nss()
> to some better place outside of rate_control_rate_init() and have it
> done with the right link, and also on changes?
>
> johannes

I did below change in my internal test, and not found the NSS=0 issue 
again for 2 link MLO.

wifi: mac80211: update all links rx nss by ieee80211_sta_set_rx_nss() in 
ieee80211_assoc_success()


diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index a21e0f34423b..f03568512f05 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4972,6 +4972,13 @@ static bool ieee80211_assoc_success(struct 
ieee80211_sub_if_data *sdata,
         }

         rate_control_rate_init(sta);
+       for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; 
link_id++) {
+               if (!(sta->sta.valid_links & BIT(link_id)) ||
+                   sta->deflink.link_id == link_id)
+                       continue;
+
+               ieee80211_sta_set_rx_nss(sta->link[link_id]);
+       }

         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
                 set_sta_flag(sta, WLAN_STA_MFP);