mac80211: add support for MLD AP client probing

Select a link for outgoing probe packets

Signed-off-by: Felix Fietkau <[email protected]>

diff --git a/package/kernel/mac80211/patches/subsys/370-wifi-mac80211-add-MLO-support-to-ieee80211_probe_cli.patch b/package/kernel/mac80211/patches/subsys/370-wifi-mac80211-add-MLO-support-to-ieee80211_probe_cli.patch
new file mode 100644 (file)
index 0000000..1f9d6a1
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/370-wifi-mac80211-add-MLO-support-to-ieee80211_probe_cli.patch
@@ -0,0 +1,64 @@
+From: Felix Fietkau <[email protected]>
+Date: Thu, 28 Aug 2025 14:41:57 +0200
+Subject: [PATCH] wifi: mac80211: add MLO support to ieee80211_probe_client
+
+Use the first available link to probe the client.
+
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/net/mac80211/cfg.c
++++ b/net/mac80211/cfg.c
+@@ -4320,7 +4320,9 @@ static int ieee80211_probe_client(struct
+       struct ieee80211_tx_info *info;
+       struct sta_info *sta;
+       struct ieee80211_chanctx_conf *chanctx_conf;
++      struct ieee80211_bss_conf *link_conf;
+       enum nl80211_band band;
++      u8 link_id;
+       int ret;
+ 
+       /* the lock is needed to assign the cookie later */
+@@ -4335,7 +4337,23 @@ static int ieee80211_probe_client(struct
+ 
+       qos = sta->sta.wme;
+ 
+-      chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
++      if (ieee80211_vif_is_mld(&sdata->vif)) {
++              if (sta->sta.valid_links)
++                      link_id = ffs(sta->sta.valid_links) - 1;
++              else
++                      link_id = sta->deflink.link_id;
++
++              link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
++              if (unlikely(!link_conf)) {
++                      ret = -ENOLINK;
++                      goto unlock;
++              }
++      } else {
++              link_id = IEEE80211_LINK_UNSPECIFIED;
++              link_conf = &sdata->vif.bss_conf;
++      }
++
++      chanctx_conf = rcu_dereference(link_conf->chanctx_conf);
+       if (WARN_ON(!chanctx_conf)) {
+               ret = -EINVAL;
+               goto unlock;
+@@ -4367,14 +4385,15 @@ static int ieee80211_probe_client(struct
+       nullfunc->frame_control = fc;
+       nullfunc->duration_id = 0;
+       memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
+-      memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
+-      memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
++      memcpy(nullfunc->addr2, link_conf->addr, ETH_ALEN);
++      memcpy(nullfunc->addr3, link_conf->addr, ETH_ALEN);
+       nullfunc->seq_ctrl = 0;
+ 
+       info = IEEE80211_SKB_CB(skb);
+ 
+       info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
+                      IEEE80211_TX_INTFL_NL80211_FRAME_TX;
++      info->control.flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK);
+       info->band = band;
+ 
+       skb_set_queue_mapping(skb, IEEE80211_AC_VO);