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wifi: mac80211: re-order assigning channel in activate links

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The current flow in _ieee80211_set_active_links() does not align with the
operational requirements of drivers that groups multiple hardware
under a single wiphy. These drivers (e.g ath12k) rely on channel
assignment to determine the appropriate hardware for each link. Without
this, the drivers cannot correctly establish the link interface.

Currently in _ieee80211_set_active_links(), after calling
drv_change_vif_links() on the driver, the state of all connected stations
is updated via drv_change_sta_links(). This is followed by handling keys
in the links, and finally, assigning the channel to the links.
Consequently, drv_change_sta_links() prompts drivers to create the station
entry at their level and within their firmware. However, since channels
have not yet been assigned to links at this stage, drivers have not
created the necessary link interface for establishing link stations,
leading to failures in activating the links.

Therefore, re-order the logic so that after drv_change_vif_links() and
removing the old links, channels are assigned to newly added links.
Following this, the flow proceeds to station handling.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Link: https://patch.msgid.link/20241001085034.2745669-1-quic_adisi@quicinc.com
[Johannes: fix iwlwifi to deal with the changes]
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Aditya Kumar Singh 2024-10-01 14:20:34 +05:30 committed by Johannes Berg
parent 31cb94f71c
commit 188a1bf894
3 changed files with 50 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
View File

@ -331,23 +331,18 @@ __iwl_mvm_mld_assign_vif_chanctx(struct iwl_mvm *mvm,
if (ret)
goto out;
/* Initialize rate control for the AP station, since we might be
* doing a link switch here - we cannot initialize it before since
* this needs the phy context assigned (and in FW?), and we cannot
* do it later because it needs to be initialized as soon as we're
* able to TX on the link, i.e. when active.
/*
* if link switching (link not active yet) we'll activate it in
* firmware later on link-info change, which mac80211 guarantees
* for link switch after the stations are set up
*/
if (mvmvif->ap_sta) {
struct ieee80211_link_sta *link_sta;
rcu_read_lock();
link_sta = rcu_dereference(mvmvif->ap_sta->link[link_id]);
if (!WARN_ON_ONCE(!link_sta))
iwl_mvm_rs_rate_init(mvm, vif, mvmvif->ap_sta,
link_conf, link_sta,
phy_ctxt->channel->band);
rcu_read_unlock();
if (ieee80211_vif_link_active(vif, link_conf->link_id)) {
ret = iwl_mvm_link_changed(mvm, vif, link_conf,
LINK_CONTEXT_MODIFY_ACTIVE |
LINK_CONTEXT_MODIFY_RATES_INFO,
true);
if (ret)
goto out;
}
if (vif->type == NL80211_IFTYPE_STATION)
@ -355,14 +350,6 @@ __iwl_mvm_mld_assign_vif_chanctx(struct iwl_mvm *mvm,
link_conf,
false);
/* then activate */
ret = iwl_mvm_link_changed(mvm, vif, link_conf,
LINK_CONTEXT_MODIFY_ACTIVE |
LINK_CONTEXT_MODIFY_RATES_INFO,
true);
if (ret)
goto out;
/*
* Power state must be updated before quotas,
* otherwise fw will complain.
@ -775,6 +762,11 @@ iwl_mvm_mld_link_info_changed_station(struct iwl_mvm *mvm,
if (WARN_ON_ONCE(!mvmvif->link[link_conf->link_id]))
return;
/* not yet marked active in vif means during link switch */
if (!ieee80211_vif_link_active(vif, link_conf->link_id) &&
vif->cfg.assoc && mvmvif->link[link_conf->link_id]->phy_ctxt)
link_changes |= LINK_CONTEXT_MODIFY_ACTIVE;
has_he = link_conf->he_support && !iwlwifi_mod_params.disable_11ax;
has_eht = link_conf->eht_support && !iwlwifi_mod_params.disable_11be;

3
drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
View File

@ -1182,6 +1182,9 @@ int iwl_mvm_mld_update_sta_links(struct iwl_mvm *mvm,
link_sta_added_to_fw |= BIT(link_id);
iwl_mvm_rs_add_sta_link(mvm, mvm_sta_link);
iwl_mvm_rs_rate_init(mvm, vif, sta, link_conf, link_sta,
link_conf->chanreq.oper.chan->band);
}
if (sta_mask_added) {

51
net/mac80211/link.c
View File

@ -388,6 +388,37 @@ static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
jiffies);
}
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
struct ieee80211_link_data *link;
link = sdata_dereference(sdata->link[link_id], sdata);
/*
* This call really should not fail. Unfortunately, it appears
* that this may happen occasionally with some drivers. Should
* it happen, we are stuck in a bad place as going backwards is
* not really feasible.
*
* So lets just tell link_use_channel that it must not fail to
* assign the channel context (from mac80211's perspective) and
* assume the driver is going to trigger a recovery flow if it
* had a failure.
* That really is not great nor guaranteed to work. But at least
* the internal mac80211 state remains consistent and there is
* a chance that we can recover.
*/
ret = _ieee80211_link_use_channel(link,
&link->conf->chanreq,
IEEE80211_CHANCTX_SHARED,
true);
WARN_ON_ONCE(ret);
/*
* inform about the link info changed parameters after all
* stations are also added
*/
}
list_for_each_entry(sta, &local->sta_list, list) {
if (sdata != sta->sdata)
continue;
@ -431,26 +462,6 @@ static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
link = sdata_dereference(sdata->link[link_id], sdata);
/*
* This call really should not fail. Unfortunately, it appears
* that this may happen occasionally with some drivers. Should
* it happen, we are stuck in a bad place as going backwards is
* not really feasible.
*
* So lets just tell link_use_channel that it must not fail to
* assign the channel context (from mac80211's perspective) and
* assume the driver is going to trigger a recovery flow if it
* had a failure.
* That really is not great nor guaranteed to work. But at least
* the internal mac80211 state remains consistent and there is
* a chance that we can recover.
*/
ret = _ieee80211_link_use_channel(link,
&link->conf->chanreq,
IEEE80211_CHANCTX_SHARED,
true);
WARN_ON_ONCE(ret);
ieee80211_mgd_set_link_qos_params(link);
ieee80211_link_info_change_notify(sdata, link,
BSS_CHANGED_ERP_CTS_PROT |