Introduce a per-VNET flag to enable/disable netisr prcessing on that VNET.

Add accessor functions to toggle the state per VNET.
The base system (vnet0) will always enable itself with the normal
registration. We will share the registered protocol handlers in all
VNETs minimising duplication and management.
Upon disabling netisr processing for a VNET drain the netisr queue from
packets for that VNET.

Update netisr consumers to (de)register on a per-VNET start/teardown using
VNET_SYS(UN)INIT functionality.

The change should be transparent for non-VIMAGE kernels.

Reviewed by:	gnn (, hiren)
Obtained from:	projects/vnet
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D6691

1 files changed, 17 insertions, 1 deletions

diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index 9346aecb9f82..2542ab68afd4 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -702,12 +702,16 @@ vnet_ether_init(__unused void *arg)
 	if ((i = pfil_head_register(&V_link_pfil_hook)) != 0)
 		printf("%s: WARNING: unable to register pfil link hook, "
 			"error %d\n", __func__, i);
+#ifdef VIMAGE
+	netisr_register_vnet(&ether_nh);
+#endif
 }
 VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
     vnet_ether_init, NULL);
  
+#ifdef VIMAGE
 static void
-vnet_ether_destroy(__unused void *arg)
+vnet_ether_pfil_destroy(__unused void *arg)
 {
 	int i;
 
@@ -715,8 +719,18 @@ vnet_ether_destroy(__unused void *arg)
 		printf("%s: WARNING: unable to unregister pfil link hook, "
 			"error %d\n", __func__, i);
 }
+VNET_SYSUNINIT(vnet_ether_pfil_uninit, SI_SUB_PROTO_PFIL, SI_ORDER_ANY,
+    vnet_ether_pfil_destroy, NULL);
+
+static void
+vnet_ether_destroy(__unused void *arg)
+{
+
+	netisr_unregister_vnet(&ether_nh);
+}
 VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
     vnet_ether_destroy, NULL);
+#endif
 
 
 
@@ -740,7 +754,9 @@ ether_input(struct ifnet *ifp, struct mbuf *m)
 		 * so assert it is correct here.
 		 */
 		KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
+		CURVNET_SET_QUIET(ifp->if_vnet);
 		netisr_dispatch(NETISR_ETHER, m);
+		CURVNET_RESTORE();
 		m = mn;
 	}
 }