net80211: Add framework for debugnet(4) support

Allow net80211 drivers to register a small vtable of debugnet-related
methods.

This is not a functional change.  Driver support is needed, similar to
debugnet(4) for wired NICs.

Reviewed by:	adrian, markj (earlier version both)
Differential Revision:	https://reviews.freebsd.org/D17308

3 files changed, 94 insertions, 1 deletions

diff --git a/sys/net80211/ieee80211_freebsd.c b/sys/net80211/ieee80211_freebsd.c
index 8802c6fb41d9..a8482ab0930e 100644
--- a/sys/net80211/ieee80211_freebsd.c
+++ b/sys/net80211/ieee80211_freebsd.c
@@ -60,6 +60,7 @@ __FBSDID("$FreeBSD$");
 #include <net80211/ieee80211_var.h>
 #include <net80211/ieee80211_input.h>
 
+DEBUGNET_DEFINE(ieee80211);
 SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
     "IEEE 80211 parameters");
 
@@ -111,7 +112,14 @@ wlan_clone_create(struct if_clone *ifc, int unit, caddr_t params)
 			cp.icp_flags & IEEE80211_CLONE_MACADDR ?
 			    cp.icp_macaddr : ic->ic_macaddr);
 
-	return (vap == NULL ? EIO : 0);
+	if (vap == NULL)
+		return (EIO);
+
+#ifdef DEBUGNET
+	if (ic->ic_debugnet_meth != NULL)
+		DEBUGNET_SET(vap->iv_ifp, ieee80211);
+#endif
+	return (0);
 }
 
 static void
@@ -1047,6 +1055,54 @@ ieee80211_get_vap_ifname(struct ieee80211vap *vap)
 	return vap->iv_ifp->if_xname;
 }
 
+#ifdef DEBUGNET
+static void
+ieee80211_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize)
+{
+	struct ieee80211vap *vap;
+	struct ieee80211com *ic;
+
+	vap = if_getsoftc(ifp);
+	ic = vap->iv_ic;
+
+	IEEE80211_LOCK(ic);
+	ic->ic_debugnet_meth->dn8_init(ic, nrxr, ncl, clsize);
+	IEEE80211_UNLOCK(ic);
+}
+
+static void
+ieee80211_debugnet_event(struct ifnet *ifp, enum debugnet_ev ev)
+{
+	struct ieee80211vap *vap;
+	struct ieee80211com *ic;
+
+	vap = if_getsoftc(ifp);
+	ic = vap->iv_ic;
+
+	IEEE80211_LOCK(ic);
+	ic->ic_debugnet_meth->dn8_event(ic, ev);
+	IEEE80211_UNLOCK(ic);
+}
+
+static int
+ieee80211_debugnet_transmit(struct ifnet *ifp, struct mbuf *m)
+{
+	return (ieee80211_vap_transmit(ifp, m));
+}
+
+static int
+ieee80211_debugnet_poll(struct ifnet *ifp, int count)
+{
+	struct ieee80211vap *vap;
+	struct ieee80211com *ic;
+
+	vap = if_getsoftc(ifp);
+	ic = vap->iv_ic;
+
+	return (ic->ic_debugnet_meth->dn8_poll(ic, count));
+}
+#endif
+
 /*
  * Module glue.
  *
diff --git a/sys/net80211/ieee80211_freebsd.h b/sys/net80211/ieee80211_freebsd.h
index 19a8e45672a9..ac4f96a753f0 100644
--- a/sys/net80211/ieee80211_freebsd.h
+++ b/sys/net80211/ieee80211_freebsd.h
@@ -40,6 +40,10 @@
 #include <sys/taskqueue.h>
 #include <sys/time.h>
 
+#ifdef DEBUGNET
+#include <net/debugnet.h>
+#endif
+
 /*
  * Common state locking definitions.
  */
@@ -492,6 +496,36 @@ typedef int ieee80211_ioctl_setfunc(struct ieee80211vap *,
     struct ieee80211req *);
 SET_DECLARE(ieee80211_ioctl_setset, ieee80211_ioctl_setfunc);
 #define	IEEE80211_IOCTL_SET(_name, _set) TEXT_SET(ieee80211_ioctl_setset, _set)
+
+#ifdef DEBUGNET
+typedef void debugnet80211_init_t(struct ieee80211com *, int *nrxr, int *ncl,
+    int *clsize);
+typedef void debugnet80211_event_t(struct ieee80211com *, enum debugnet_ev);
+typedef int debugnet80211_poll_t(struct ieee80211com *, int);
+
+struct debugnet80211_methods {
+	debugnet80211_init_t		*dn8_init;
+	debugnet80211_event_t		*dn8_event;
+	debugnet80211_poll_t		*dn8_poll;
+};
+
+#define	DEBUGNET80211_DEFINE(driver)					\
+	static debugnet80211_init_t driver##_debugnet80211_init;		\
+	static debugnet80211_event_t driver##_debugnet80211_event;	\
+	static debugnet80211_poll_t driver##_debugnet80211_poll;		\
+									\
+	static struct debugnet80211_methods driver##_debugnet80211_methods = { \
+		.dn8_init = driver##_debugnet80211_init,			\
+		.dn8_event = driver##_debugnet80211_event,		\
+		.dn8_poll = driver##_debugnet80211_poll,			\
+	}
+#define DEBUGNET80211_SET(ic, driver)					\
+	(ic)->ic_debugnet_meth = &driver##_debugnet80211_methods
+#else
+#define DEBUGNET80211_DEFINE(driver)
+#define DEBUGNET80211_SET(ic, driver)
+#endif /* DEBUGNET */
+
 #endif /* _KERNEL */
 
 /* XXX this stuff belongs elsewhere */
diff --git a/sys/net80211/ieee80211_var.h b/sys/net80211/ieee80211_var.h
index 1fa596b2391d..6af94ed343c8 100644
--- a/sys/net80211/ieee80211_var.h
+++ b/sys/net80211/ieee80211_var.h
@@ -132,6 +132,8 @@ struct ieee80211_rx_ampdu;
 struct ieee80211_superg;
 struct ieee80211_frame;
 
+struct net80211dump_methods;
+
 struct ieee80211com {
 	void			*ic_softc;	/* driver softc */
 	const char		*ic_name;	/* usually device name */
@@ -370,6 +372,7 @@ struct ieee80211com {
 	/* The channel width has changed (20<->2040) */
 	void			(*ic_update_chw)(struct ieee80211com *);
 
+	const struct debugnet80211_methods	*ic_debugnet_meth;
 	uint64_t		ic_spare[7];
 };