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)

2 files changed, 0 insertions, 8 deletions

diff --git a/sys/dev/cxgb/ulp/iw_cxgb/iw_cxgb.c b/sys/dev/cxgb/ulp/iw_cxgb/iw_cxgb.c
index db1c406..8fd1e97 100644
--- a/sys/dev/cxgb/ulp/iw_cxgb/iw_cxgb.c
+++ b/sys/dev/cxgb/ulp/iw_cxgb/iw_cxgb.c
@@ -240,7 +240,6 @@ iwch_init_module(void)
 	VNET_LIST_RLOCK();
 	VNET_FOREACH(vnet_iter) {
 		CURVNET_SET(vnet_iter); /* XXX CURVNET_SET_QUIET() ? */
-		INIT_VNET_NET(vnet_iter);
 		TAILQ_FOREACH(ifp, &V_ifnet, if_link)
 			(void)ifaddr_event_handler(NULL, ifp);
 		CURVNET_RESTORE();
diff --git a/sys/dev/cxgb/ulp/tom/cxgb_cpl_io.c b/sys/dev/cxgb/ulp/tom/cxgb_cpl_io.c
index f04d54f..1cbaaff 100644
--- a/sys/dev/cxgb/ulp/tom/cxgb_cpl_io.c
+++ b/sys/dev/cxgb/ulp/tom/cxgb_cpl_io.c
@@ -78,9 +78,6 @@ __FBSDID("$FreeBSD$");
 #include <netinet/tcp_seq.h>
 #include <netinet/tcp_syncache.h>
 #include <netinet/tcp_timer.h>
-#if __FreeBSD_version >= 800056
-#include <netinet/vinet.h>
-#endif
 #include <net/route.h>
 
 #include <t3cdev.h>
@@ -274,7 +271,6 @@ mk_tid_release(struct mbuf *m, const struct toepcb *toep, unsigned int tid)
 static inline void
 make_tx_data_wr(struct socket *so, struct mbuf *m, int len, struct mbuf *tail)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct tcpcb *tp = so_sototcpcb(so);
 	struct toepcb *toep = tp->t_toe;
 	struct tx_data_wr *req;
@@ -1219,7 +1215,6 @@ install_offload_ops(struct socket *so)
 static __inline int
 select_rcv_wscale(int space, struct vnet *vnet)
 {
-	INIT_VNET_INET(vnet);
 	int wscale = 0;
 
 	if (space > MAX_RCV_WND)
@@ -1237,7 +1232,6 @@ select_rcv_wscale(int space, struct vnet *vnet)
 static unsigned long
 select_rcv_wnd(struct toedev *dev, struct socket *so)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct tom_data *d = TOM_DATA(dev);
 	unsigned int wnd;
 	unsigned int max_rcv_wnd;
@@ -3780,7 +3774,6 @@ fixup_and_send_ofo(struct toepcb *toep)
 static void
 socket_act_establish(struct socket *so, struct mbuf *m)
 {
-	INIT_VNET_INET(so->so_vnet);
 	struct cpl_act_establish *req = cplhdr(m);
 	u32 rcv_isn = ntohl(req->rcv_isn);	/* real RCV_ISN + 1 */
 	struct tcpcb *tp = so_sototcpcb(so);