[01/14] wifi: mac80211: Add support to indicate that a new interface is to be added

Commit Message

Korenblit, Miriam Rachel Oct. 7, 2024, noon UTC

From: Ilan Peer <[e-mail]>

Add support to indicate to the driver that an interface is about to be
added so that the driver could prepare its resources early if it needs
so.

Signed-off-by: Ilan Peer <[e-mail]>
Reviewed-by: Johannes Berg <[e-mail]>
Signed-off-by: Miri Korenblit <[e-mail]>
---
 include/net/mac80211.h    |  8 ++++++++
 net/mac80211/cfg.c        | 18 ++++++++++++++++++
 net/mac80211/driver-ops.h | 12 ++++++++++++
 net/mac80211/trace.h      | 19 +++++++++++++++++++
 4 files changed, 57 insertions(+)

Patch

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 954dff901b69..479b61fdfb96 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -4444,6 +4444,12 @@  struct ieee80211_prep_tx_info {
  *	if the requested TID-To-Link mapping can be accepted or not.
  *	If it's not accepted the driver may suggest a preferred mapping and
  *	modify @ttlm parameter with the suggested TID-to-Link mapping.
+ * @prep_add_interface: prepare for interface addition. This can be used by
+ *      drivers to prepare for the addition of a new interface, e.g., allocate
+ *      the needed resources etc. This callback doesn't guarantee that an
+ *      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.
  */
 struct ieee80211_ops {
 	void (*tx)(struct ieee80211_hw *hw,
@@ -4828,6 +4834,8 @@  struct ieee80211_ops {
 	enum ieee80211_neg_ttlm_res
 	(*can_neg_ttlm)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 			struct ieee80211_neg_ttlm *ttlm);
+	void (*prep_add_interface)(struct ieee80211_hw *hw,
+				   enum nl80211_iftype type);
 };
 
 /**
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 847304a3a29a..ce9558cd1576 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -194,6 +194,24 @@  static struct wireless_dev *ieee80211_add_iface(struct wiphy *wiphy,
 		}
 	}
 
+	/* Let the driver know that an interface is going to be added.
+	 * Indicate so only for interface types that will be added to the
+	 * driver.
+	 */
+	switch (type) {
+	case NL80211_IFTYPE_AP_VLAN:
+		break;
+	case NL80211_IFTYPE_MONITOR:
+		if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF) ||
+		    !(params->flags & MONITOR_FLAG_ACTIVE))
+			break;
+		fallthrough;
+	default:
+		drv_prep_add_interface(local,
+				       ieee80211_vif_type_p2p(&sdata->vif));
+		break;
+	}
+
 	return wdev;
 }
 
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index d382d9729e85..48bc2da728c0 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -1728,4 +1728,16 @@  drv_can_neg_ttlm(struct ieee80211_local *local,
 
 	return res;
 }
+
+static inline void
+drv_prep_add_interface(struct ieee80211_local *local,
+		       enum nl80211_iftype type)
+{
+	trace_drv_prep_add_interface(local, type);
+	if (local->ops->prep_add_interface)
+		local->ops->prep_add_interface(&local->hw, type);
+
+	trace_drv_return_void(local);
+}
+
 #endif /* __MAC80211_DRIVER_OPS */
diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h
index dc498cd8cd91..e6f0ce8e5d43 100644
--- a/net/mac80211/trace.h
+++ b/net/mac80211/trace.h
@@ -3154,6 +3154,25 @@  TRACE_EVENT(drv_neg_ttlm_res,
 		  LOCAL_PR_ARG, VIF_PR_ARG, __entry->res
 	)
 );
+
+TRACE_EVENT(drv_prep_add_interface,
+	    TP_PROTO(struct ieee80211_local *local,
+		     enum nl80211_iftype type),
+
+	TP_ARGS(local, type),
+	TP_STRUCT__entry(LOCAL_ENTRY
+			 __field(u32, type)
+	),
+
+	TP_fast_assign(LOCAL_ASSIGN;
+		       __entry->type = type;
+	),
+
+	TP_printk(LOCAL_PR_FMT  " type: %u\n ",
+		  LOCAL_PR_ARG, __entry->type
+	)
+);
+
 #endif /* !__MAC80211_DRIVER_TRACE || TRACE_HEADER_MULTI_READ */
 
 #undef TRACE_INCLUDE_PATH