From 8819ad852fcc38e42412f60687955b48439e1db7 Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@FreeBSD.org>
Date: Mon, 24 Jul 2017 03:32:10 +0000
Subject: [PATCH] ethernet: Add ethernet interface attached event and devctl
 notification.

ifnet_arrival_event may not be adequate under certain situation; e.g.
when the LLADDR is needed.  So the ethernet ifattach event is announced
after all necessary bits are setup.

MFC after:	3 days
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D11617
---
 sys/net/ethernet.h     | 6 ++++++
 sys/net/if_ethersubr.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/sys/net/ethernet.h b/sys/net/ethernet.h
index bc5fa9cb33f7..5cd1dc501343 100644
--- a/sys/net/ethernet.h
+++ b/sys/net/ethernet.h
@@ -406,6 +406,12 @@ void	ether_vlan_mtap(struct bpf_if *, struct mbuf *,
 	    void *, u_int);
 struct mbuf  *ether_vlanencap(struct mbuf *, uint16_t);
 
+#ifdef _SYS_EVENTHANDLER_H_
+/* new ethernet interface attached event */
+typedef void (*ether_ifattach_event_handler_t)(void *, struct ifnet *);
+EVENTHANDLER_DECLARE(ether_ifattach_event, ether_ifattach_event_handler_t);
+#endif
+
 #else /* _KERNEL */
 
 #include <sys/cdefs.h>
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index 7b1ba85c617f..7d5f1dc61c11 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -38,6 +38,8 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/eventhandler.h>
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
@@ -931,6 +933,11 @@ ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
 		if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
 
 	uuid_ether_add(LLADDR(sdl));
+
+	/* Add necessary bits are setup; announce it now. */
+	EVENTHANDLER_INVOKE(ether_ifattach_event, ifp);
+	if (IS_DEFAULT_VNET(curvnet))
+		devctl_notify("ETHERNET", ifp->if_xname, "IFATTACH", NULL);
 }
 
 /*