eddfbb763d
(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)
146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/*-
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* Copyright (c) 2007, Chelsio Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Neither the name of the Chelsio Corporation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/vimage.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_pcb.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcp_offload.h>
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#include <netinet/toedev.h>
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uint32_t toedev_registration_count;
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int
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tcp_offload_connect(struct socket *so, struct sockaddr *nam)
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{
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struct ifnet *ifp;
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struct toedev *tdev;
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struct rtentry *rt;
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int error;
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if (toedev_registration_count == 0)
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return (EINVAL);
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/*
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* Look up the route used for the connection to
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* determine if it uses an interface capable of
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* offloading the connection.
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*/
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rt = rtalloc1(nam, 0 /*report*/, 0 /*ignflags*/);
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if (rt)
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RT_UNLOCK(rt);
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else
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return (EHOSTUNREACH);
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ifp = rt->rt_ifp;
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if ((ifp->if_capenable & IFCAP_TOE) == 0) {
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error = EINVAL;
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goto fail;
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}
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tdev = TOEDEV(ifp);
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if (tdev == NULL) {
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error = EPERM;
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goto fail;
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}
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if (tdev->tod_can_offload(tdev, so) == 0) {
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error = EPERM;
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goto fail;
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}
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return (tdev->tod_connect(tdev, so, rt, nam));
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fail:
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RTFREE(rt);
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return (error);
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}
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/*
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* This file contains code as a short-term staging area before it is moved in
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* to sys/netinet/tcp_offload.c
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*/
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void
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tcp_offload_twstart(struct tcpcb *tp)
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{
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INP_INFO_WLOCK(&V_tcbinfo);
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INP_WLOCK(tp->t_inpcb);
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tcp_twstart(tp);
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INP_INFO_WUNLOCK(&V_tcbinfo);
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}
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struct tcpcb *
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tcp_offload_close(struct tcpcb *tp)
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{
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INP_INFO_WLOCK(&V_tcbinfo);
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INP_WLOCK(tp->t_inpcb);
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tp = tcp_close(tp);
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INP_INFO_WUNLOCK(&V_tcbinfo);
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if (tp)
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INP_WUNLOCK(tp->t_inpcb);
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return (tp);
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}
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struct tcpcb *
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tcp_offload_drop(struct tcpcb *tp, int error)
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{
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INP_INFO_WLOCK(&V_tcbinfo);
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INP_WLOCK(tp->t_inpcb);
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tp = tcp_drop(tp, error);
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INP_INFO_WUNLOCK(&V_tcbinfo);
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if (tp)
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INP_WUNLOCK(tp->t_inpcb);
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return (tp);
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}
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