wifi: mac80211: Add eMLSR/eMLMR action frame parsing support

Introduce support in AP mode for parsing of the Operating Mode Notification
frame sent by the client to enable/disable MLO eMLSR or eMLMR if supported
by both the AP and the client.
Add drv_set_eml_op_mode mac80211 callback in order to configure underlay
driver with eMLSR/eMLMR info.

Tested-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260129-mac80211-emlsr-v4-1-14bdadf57380@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 49 insertions, 0 deletions

diff --git a/include/linux/ieee80211-eht.h b/include/linux/ieee80211-eht.h
index 620dad3995cc..f8e9f5d36d2a 100644
--- a/include/linux/ieee80211-eht.h
+++ b/include/linux/ieee80211-eht.h
@@ -558,6 +558,17 @@ struct ieee80211_mle_tdls_common_info {
 
 #define IEEE80211_MLC_PRIO_ACCESS_PRES_AP_MLD_MAC_ADDR	0x0010
 
+#define IEEE80211_EML_CTRL_EMLSR_MODE		BIT(0)
+#define IEEE80211_EML_CTRL_EMLMR_MODE		BIT(1)
+#define IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE	BIT(2)
+#define IEEE80211_EML_CTRL_INDEV_COEX_ACT	BIT(3)
+
+#define IEEE80211_EML_EMLSR_PAD_DELAY		0x07
+#define IEEE80211_EML_EMLSR_TRANS_DELAY		0x38
+
+#define IEEE80211_EML_EMLMR_RX_MCS_MAP		0xf0
+#define IEEE80211_EML_EMLMR_TX_MCS_MAP		0x0f
+
 /* no fixed fields in PRIO_ACCESS */
 
 /**
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 82d797be95b9..0aa2fb8f88de 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -1186,6 +1186,12 @@ struct ieee80211_mgmt {
 					u8 action_code;
 					u8 variable[];
 				} __packed epcs;
+				struct {
+					u8 action_code;
+					u8 dialog_token;
+					u8 control;
+					u8 variable[];
+				} __packed eml_omn;
 			} u;
 		} __packed action;
 		DECLARE_FLEX_ARRAY(u8, body); /* Generic frame body */
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7a55762f9af8..7f9d96939a4e 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1918,6 +1918,31 @@ enum ieee80211_offload_flags {
 };
 
 /**
+ * struct ieee80211_eml_params - EHT Operating mode notification parameters
+ *
+ * EML Operating mode notification parameters received in the Operating mode
+ * notification frame. This struct is used as a container to pass the info to
+ * the underlay driver.
+ *
+ * @link_id: the link ID where the Operating mode notification frame has been
+ *	received.
+ * @control: EML control field defined in P802.11be section 9.4.1.76.
+ * @link_bitmap: eMLSR/eMLMR enabled links defined in P802.11be
+ *	section 9.4.1.76.
+ * @emlmr_mcs_map_count: eMLMR number of valid mcs_map_bw fields according to
+ *	P802.11be section 9.4.1.76 (valid if eMLMR mode control bit is set).
+ * @emlmr_mcs_map_bw: eMLMR supported MCS and NSS set subfileds defined in
+ *	P802.11be section 9.4.1.76 (valid if eMLMR mode control bit is set).
+ */
+struct ieee80211_eml_params {
+	u8 link_id;
+	u8 control;
+	u16 link_bitmap;
+	u8 emlmr_mcs_map_count;
+	u8 emlmr_mcs_map_bw[9];
+};
+
+/**
  * struct ieee80211_vif_cfg - interface configuration
  * @assoc: association status
  * @ibss_joined: indicates whether this station is part of an IBSS or not
@@ -4530,6 +4555,9 @@ struct ieee80211_prep_tx_info {
  *      interface with the specified type would be added, and thus drivers that
  *      implement this callback need to handle such cases. The type is the full
  *      &enum nl80211_iftype.
+ * @set_eml_op_mode: Configure eMLSR/eMLMR operation mode in the underlay
+ *	driver according to the parameter received in the EML Operating mode
+ *	notification frame.
  */
 struct ieee80211_ops {
 	void (*tx)(struct ieee80211_hw *hw,
@@ -4925,6 +4953,10 @@ struct ieee80211_ops {
 			struct ieee80211_neg_ttlm *ttlm);
 	void (*prep_add_interface)(struct ieee80211_hw *hw,
 				   enum nl80211_iftype type);
+	int (*set_eml_op_mode)(struct ieee80211_hw *hw,
+			       struct ieee80211_vif *vif,
+			       struct ieee80211_sta *sta,
+			       struct ieee80211_eml_params *eml_params);
 };
 
 /**