Introduce and use a sysinit-based initialization scheme for virtual

network stacks, VNET_SYSINIT:

- Add VNET_SYSINIT and VNET_SYSUNINIT macros to declare events that will
  occur each time a network stack is instantiated and destroyed.  In the
  !VIMAGE case, these are simply mapped into regular SYSINIT/SYSUNINIT.
  For the VIMAGE case, we instead use SYSINIT's to track their order and
  properties on registration, using them for each vnet when created/
  destroyed, or immediately on module load for already-started vnets.
- Remove vnet_modinfo mechanism that existed to serve this purpose
  previously, as well as its dependency scheme: we now just use the
  SYSINIT ordering scheme.
- Implement VNET_DOMAIN_SET() to allow protocol domains to declare that
  they want init functions to be called for each virtual network stack
  rather than just once at boot, compiling down to DOMAIN_SET() in the
  non-VIMAGE case.
- Walk all virtualized kernel subsystems and make use of these instead
  of modinfo or DOMAIN_SET() for init/uninit events.  In some cases,
  convert modular components from using modevent to using sysinit (where
  appropriate).  In some cases, do minor rejuggling of SYSINIT ordering
  to make room for or better manage events.

Portions submitted by:	jhb (VNET_SYSINIT), bz (cleanup)
Discussed with:		jhb, bz, julian, zec
Reviewed by:		bz
Approved by:		re (VIMAGE blanket)

1 files changed, 10 insertions, 30 deletions

diff --git a/sys/net/flowtable.c b/sys/net/flowtable.c
index d16ffa3..1fe2bbe 100644
--- a/sys/net/flowtable.c
+++ b/sys/net/flowtable.c
@@ -55,6 +55,7 @@ __FBSDID("$FreeBSD$");
 #include <net/if_var.h>
 #include <net/route.h> 
 #include <net/flowtable.h>
+#include <net/vnet.h>
 
 #include <netinet/in.h>
 #include <netinet/in_systm.h>
@@ -173,18 +174,6 @@ static VNET_DEFINE(uma_zone_t, flow_ipv6_zone);
 #define	V_flow_ipv4_zone	VNET(flow_ipv4_zone)
 #define	V_flow_ipv6_zone	VNET(flow_ipv6_zone)
 
-static int	flowtable_iattach(const void *);
-#ifdef VIMAGE
-static int	flowtable_idetach(const void *);
-
-static const vnet_modinfo_t flowtable_modinfo = {
-	.vmi_id		= VNET_MOD_FLOWTABLE,
-	.vmi_name	= "flowtable",
-	.vmi_iattach    = flowtable_iattach,
-	.vmi_idetach    = flowtable_idetach
-};
-#endif
-
 /*
  * TODO:
  * - Make flowtable stats per-cpu, aggregated at sysctl call time,
@@ -802,18 +791,7 @@ flowtable_alloc(int nentry, int flags)
 }
 
 static void
-flowtable_setup(void *arg)
-{
-
-#ifdef VIMAGE
-	vnet_mod_register(&flowtable_modinfo);
-#else
-	flowtable_iattach(NULL);
-#endif
-}
-
-static int
-flowtable_iattach(const void *unused __unused)
+flowtable_init(const void *unused __unused)
 {
 
 	V_flow_ipv4_zone = uma_zcreate("ip4flow", sizeof(struct flentry_v4),
@@ -822,21 +800,23 @@ flowtable_iattach(const void *unused __unused)
 	    NULL, NULL, NULL, NULL, 64, UMA_ZONE_MAXBUCKET);	
 	uma_zone_set_max(V_flow_ipv4_zone, V_flowtable_nmbflows);
 	uma_zone_set_max(V_flow_ipv6_zone, V_flowtable_nmbflows);
-	return (0);
 }
 
+VNET_SYSINIT(flowtable_init, SI_SUB_KTHREAD_INIT, SI_ORDER_ANY,
+    flowtable_init, NULL);
+
 #ifdef VIMAGE
-static int
-flowtable_idetach(const void *unused __unused)
+static void
+flowtable_uninit(const void *unused __unused)
 {
 
 	uma_zdestroy(V_flow_ipv4_zone);
 	uma_zdestroy(V_flow_ipv6_zone);
-	return (0);
 }
-#endif
 
-SYSINIT(flowtable_setup, SI_SUB_KTHREAD_INIT, SI_ORDER_ANY, flowtable_setup, NULL);
+VNET_SYSUNINIT(flowtable_uninit, SI_SUB_KTHREAD_INIT, SI_ORDER_ANY,
+    flowtable_uninit, NULL);
+#endif
 
 /*
  * The rest of the code is devoted to garbage collection of expired entries.