Build on Jeff Roberson's linker-set based dynamic per-CPU allocator

(DPCPU), as suggested by Peter Wemm, and implement a new per-virtual
network stack memory allocator.  Modify vnet to use the allocator
instead of monolithic global container structures (vinet, ...).  This
change solves many binary compatibility problems associated with
VIMAGE, and restores ELF symbols for virtualized global variables.

Each virtualized global variable exists as a "reference copy", and also
once per virtual network stack.  Virtualized global variables are
tagged at compile-time, placing the in a special linker set, which is
loaded into a contiguous region of kernel memory.  Virtualized global
variables in the base kernel are linked as normal, but those in modules
are copied and relocated to a reserved portion of the kernel's vnet
region with the help of a the kernel linker.

Virtualized global variables exist in per-vnet memory set up when the
network stack instance is created, and are initialized statically from
the reference copy.  Run-time access occurs via an accessor macro, which
converts from the current vnet and requested symbol to a per-vnet
address.  When "options VIMAGE" is not compiled into the kernel, normal
global ELF symbols will be used instead and indirection is avoided.

This change restores static initialization for network stack global
variables, restores support for non-global symbols and types, eliminates
the need for many subsystem constructors, eliminates large per-subsystem
structures that caused many binary compatibility issues both for
monitoring applications (netstat) and kernel modules, removes the
per-function INIT_VNET_*() macros throughout the stack, eliminates the
need for vnet_symmap ksym(2) munging, and eliminates duplicate
definitions of virtualized globals under VIMAGE_GLOBALS.

Bump __FreeBSD_version and update UPDATING.

Portions submitted by:  bz
Reviewed by:            bz, zec
Discussed with:         gnn, jamie, jeff, jhb, julian, sam
Suggested by:           peter
Approved by:            re (kensmith)

1 files changed, 0 insertions, 19 deletions

diff --git a/sys/netinet6/udp6_usrreq.c b/sys/netinet6/udp6_usrreq.c
index 5eb4a47..ab173a8 100644
--- a/sys/netinet6/udp6_usrreq.c
+++ b/sys/netinet6/udp6_usrreq.c
@@ -102,14 +102,12 @@ __FBSDID("$FreeBSD$");
 #include <netinet/ip_var.h>
 #include <netinet/udp.h>
 #include <netinet/udp_var.h>
-#include <netinet/vinet.h>
 
 #include <netinet6/ip6protosw.h>
 #include <netinet6/ip6_var.h>
 #include <netinet6/in6_pcb.h>
 #include <netinet6/udp6_var.h>
 #include <netinet6/scope6_var.h>
-#include <netinet6/vinet6.h>
 
 #ifdef IPSEC
 #include <netipsec/ipsec.h>
@@ -130,7 +128,6 @@ static void
 udp6_append(struct inpcb *inp, struct mbuf *n, int off,
     struct sockaddr_in6 *fromsa)
 {
-	INIT_VNET_INET(inp->inp_vnet);
 	struct socket *so;
 	struct mbuf *opts;
 
@@ -139,7 +136,6 @@ udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 #ifdef IPSEC
 	/* Check AH/ESP integrity. */
 	if (ipsec6_in_reject(n, inp)) {
-		INIT_VNET_IPSEC(inp->inp_vnet);
 		m_freem(n);
 		V_ipsec6stat.in_polvio++;
 		return;
@@ -173,8 +169,6 @@ udp6_append(struct inpcb *inp, struct mbuf *n, int off,
 int
 udp6_input(struct mbuf **mp, int *offp, int proto)
 {
-	INIT_VNET_INET(curvnet);
-	INIT_VNET_INET6(curvnet);
 	struct mbuf *m = *mp;
 	struct ifnet *ifp;
 	struct ip6_hdr *ip6;
@@ -427,7 +421,6 @@ badunlocked:
 void
 udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 {
-	INIT_VNET_INET(curvnet);
 	struct udphdr uh;
 	struct ip6_hdr *ip6;
 	struct mbuf *m;
@@ -493,8 +486,6 @@ udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
 static int
 udp6_getcred(SYSCTL_HANDLER_ARGS)
 {
-	INIT_VNET_INET(curvnet);
-	INIT_VNET_INET6(curvnet);
 	struct xucred xuc;
 	struct sockaddr_in6 addrs[2];
 	struct inpcb *inp;
@@ -546,8 +537,6 @@ static int
 udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
     struct mbuf *control, struct thread *td)
 {
-	INIT_VNET_INET(curvnet);
-	INIT_VNET_INET6(curvnet);
 	u_int32_t ulen = m->m_pkthdr.len;
 	u_int32_t plen = sizeof(struct udphdr) + ulen;
 	struct ip6_hdr *ip6;
@@ -766,7 +755,6 @@ releaseopt:
 static void
 udp6_abort(struct socket *so)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 
 	inp = sotoinpcb(so);
@@ -796,7 +784,6 @@ udp6_abort(struct socket *so)
 static int
 udp6_attach(struct socket *so, int proto, struct thread *td)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 	int error;
 
@@ -843,7 +830,6 @@ udp6_attach(struct socket *so, int proto, struct thread *td)
 static int
 udp6_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 	int error;
 
@@ -883,7 +869,6 @@ out:
 static void
 udp6_close(struct socket *so)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 
 	inp = sotoinpcb(so);
@@ -912,7 +897,6 @@ udp6_close(struct socket *so)
 static int
 udp6_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 	struct sockaddr_in6 *sin6;
 	int error;
@@ -969,7 +953,6 @@ out:
 static void
 udp6_detach(struct socket *so)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 	struct udpcb *up;
 
@@ -989,7 +972,6 @@ udp6_detach(struct socket *so)
 static int
 udp6_disconnect(struct socket *so)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 	int error;
 
@@ -1029,7 +1011,6 @@ static int
 udp6_send(struct socket *so, int flags, struct mbuf *m,
     struct sockaddr *addr, struct mbuf *control, struct thread *td)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct inpcb *inp;
 	int error = 0;