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985 lines
26 KiB
C
985 lines
26 KiB
C
/*-
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* Copyright (c) 2008 The FreeBSD Foundation
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* Copyright (c) 2009-2010 Bjoern A. Zeeb <bz@FreeBSD.org>
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* All rights reserved.
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*
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* This software was developed by CK Software GmbH under sponsorship
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* from the FreeBSD Foundation.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* A pair of virtual back-to-back connected ethernet like interfaces
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* (``two interfaces with a virtual cross-over cable'').
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*
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* This is mostly intended to be used to provide connectivity between
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* different virtual network stack instances.
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*/
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/*
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* Things to re-think once we have more experience:
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* - ifp->if_reassign function once we can test with vimage. Depending on
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* how if_vmove() is going to be improved.
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* - Real random etheraddrs that are checked to be uniquish; we would need
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* to re-do them in case we move the interface between network stacks
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* in a private if_reassign function.
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* In case we bridge to a real interface/network or between indepedent
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* epairs on multiple stacks/machines, we may need this.
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* For now let the user handle that case.
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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/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/refcount.h>
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#include <sys/queue.h>
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#include <sys/smp.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <net/bpf.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_clone.h>
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#include <net/if_media.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/vnet.h>
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SYSCTL_DECL(_net_link);
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static SYSCTL_NODE(_net_link, OID_AUTO, epair, CTLFLAG_RW, 0, "epair sysctl");
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#ifdef EPAIR_DEBUG
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static int epair_debug = 0;
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SYSCTL_INT(_net_link_epair, OID_AUTO, epair_debug, CTLFLAG_RW,
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&epair_debug, 0, "if_epair(4) debugging.");
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#define DPRINTF(fmt, arg...) \
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if (epair_debug) \
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printf("[%s:%d] " fmt, __func__, __LINE__, ##arg)
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#else
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#define DPRINTF(fmt, arg...)
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#endif
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static void epair_nh_sintr(struct mbuf *);
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static struct mbuf *epair_nh_m2cpuid(struct mbuf *, uintptr_t, u_int *);
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static void epair_nh_drainedcpu(u_int);
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static void epair_start_locked(struct ifnet *);
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static int epair_media_change(struct ifnet *);
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static void epair_media_status(struct ifnet *, struct ifmediareq *);
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static int epair_clone_match(struct if_clone *, const char *);
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static int epair_clone_create(struct if_clone *, char *, size_t, caddr_t);
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static int epair_clone_destroy(struct if_clone *, struct ifnet *);
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static const char epairname[] = "epair";
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/* Netisr realted definitions and sysctl. */
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static struct netisr_handler epair_nh = {
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.nh_name = epairname,
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.nh_proto = NETISR_EPAIR,
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.nh_policy = NETISR_POLICY_CPU,
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.nh_handler = epair_nh_sintr,
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.nh_m2cpuid = epair_nh_m2cpuid,
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.nh_drainedcpu = epair_nh_drainedcpu,
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};
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static int
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sysctl_epair_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
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{
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int error, qlimit;
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netisr_getqlimit(&epair_nh, &qlimit);
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error = sysctl_handle_int(oidp, &qlimit, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qlimit < 1)
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return (EINVAL);
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return (netisr_setqlimit(&epair_nh, qlimit));
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}
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SYSCTL_PROC(_net_link_epair, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
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0, 0, sysctl_epair_netisr_maxqlen, "I",
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"Maximum if_epair(4) netisr \"hw\" queue length");
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struct epair_softc {
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struct ifnet *ifp; /* This ifp. */
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struct ifnet *oifp; /* other ifp of pair. */
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struct ifmedia media; /* Media config (fake). */
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u_int refcount; /* # of mbufs in flight. */
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u_int cpuid; /* CPU ID assigned upon creation. */
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void (*if_qflush)(struct ifnet *);
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/* Original if_qflush routine. */
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};
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/*
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* Per-CPU list of ifps with data in the ifq that needs to be flushed
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* to the netisr ``hw'' queue before we allow any further direct queuing
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* to the ``hw'' queue.
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*/
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struct epair_ifp_drain {
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STAILQ_ENTRY(epair_ifp_drain) ifp_next;
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struct ifnet *ifp;
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};
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STAILQ_HEAD(eid_list, epair_ifp_drain);
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#define EPAIR_LOCK_INIT(dpcpu) mtx_init(&(dpcpu)->if_epair_mtx, \
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"if_epair", NULL, MTX_DEF)
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#define EPAIR_LOCK_DESTROY(dpcpu) mtx_destroy(&(dpcpu)->if_epair_mtx)
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#define EPAIR_LOCK_ASSERT(dpcpu) mtx_assert(&(dpcpu)->if_epair_mtx, \
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MA_OWNED)
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#define EPAIR_LOCK(dpcpu) mtx_lock(&(dpcpu)->if_epair_mtx)
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#define EPAIR_UNLOCK(dpcpu) mtx_unlock(&(dpcpu)->if_epair_mtx)
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#ifdef INVARIANTS
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#define EPAIR_REFCOUNT_INIT(r, v) refcount_init((r), (v))
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#define EPAIR_REFCOUNT_AQUIRE(r) refcount_acquire((r))
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#define EPAIR_REFCOUNT_RELEASE(r) refcount_release((r))
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#define EPAIR_REFCOUNT_ASSERT(a, p) KASSERT(a, p)
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#else
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#define EPAIR_REFCOUNT_INIT(r, v)
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#define EPAIR_REFCOUNT_AQUIRE(r)
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#define EPAIR_REFCOUNT_RELEASE(r)
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#define EPAIR_REFCOUNT_ASSERT(a, p)
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#endif
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static MALLOC_DEFINE(M_EPAIR, epairname,
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"Pair of virtual cross-over connected Ethernet-like interfaces");
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static struct if_clone *epair_cloner;
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/*
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* DPCPU area and functions.
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*/
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struct epair_dpcpu {
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struct mtx if_epair_mtx; /* Per-CPU locking. */
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int epair_drv_flags; /* Per-CPU ``hw'' drv flags. */
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struct eid_list epair_ifp_drain_list; /* Per-CPU list of ifps with
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* data in the ifq. */
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};
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DPCPU_DEFINE(struct epair_dpcpu, epair_dpcpu);
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static void
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epair_dpcpu_init(void)
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{
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struct epair_dpcpu *epair_dpcpu;
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struct eid_list *s;
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u_int cpuid;
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CPU_FOREACH(cpuid) {
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epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
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/* Initialize per-cpu lock. */
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EPAIR_LOCK_INIT(epair_dpcpu);
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/* Driver flags are per-cpu as are our netisr "hw" queues. */
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epair_dpcpu->epair_drv_flags = 0;
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/*
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* Initialize per-cpu drain list.
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* Manually do what STAILQ_HEAD_INITIALIZER would do.
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*/
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s = &epair_dpcpu->epair_ifp_drain_list;
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s->stqh_first = NULL;
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s->stqh_last = &s->stqh_first;
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}
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}
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static void
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epair_dpcpu_detach(void)
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{
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struct epair_dpcpu *epair_dpcpu;
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u_int cpuid;
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CPU_FOREACH(cpuid) {
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epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
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/* Destroy per-cpu lock. */
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EPAIR_LOCK_DESTROY(epair_dpcpu);
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}
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}
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/*
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* Helper functions.
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*/
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static u_int
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cpuid_from_ifp(struct ifnet *ifp)
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{
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struct epair_softc *sc;
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if (ifp == NULL)
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return (0);
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sc = ifp->if_softc;
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return (sc->cpuid);
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}
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/*
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* Netisr handler functions.
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*/
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static void
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epair_nh_sintr(struct mbuf *m)
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{
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struct ifnet *ifp;
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struct epair_softc *sc;
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ifp = m->m_pkthdr.rcvif;
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(*ifp->if_input)(ifp, m);
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sc = ifp->if_softc;
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EPAIR_REFCOUNT_RELEASE(&sc->refcount);
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EPAIR_REFCOUNT_ASSERT((int)sc->refcount >= 1,
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("%s: ifp=%p sc->refcount not >= 1: %d",
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__func__, ifp, sc->refcount));
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DPRINTF("ifp=%p refcount=%u\n", ifp, sc->refcount);
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}
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static struct mbuf *
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epair_nh_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid)
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{
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*cpuid = cpuid_from_ifp(m->m_pkthdr.rcvif);
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return (m);
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}
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static void
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epair_nh_drainedcpu(u_int cpuid)
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{
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struct epair_dpcpu *epair_dpcpu;
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struct epair_ifp_drain *elm, *tvar;
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struct ifnet *ifp;
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epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
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EPAIR_LOCK(epair_dpcpu);
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/*
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* Assume our "hw" queue and possibly ifq will be emptied
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* again. In case we will overflow the "hw" queue while
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* draining, epair_start_locked will set IFF_DRV_OACTIVE
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* again and we will stop and return.
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*/
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STAILQ_FOREACH_SAFE(elm, &epair_dpcpu->epair_ifp_drain_list,
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ifp_next, tvar) {
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ifp = elm->ifp;
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epair_dpcpu->epair_drv_flags &= ~IFF_DRV_OACTIVE;
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ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
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epair_start_locked(ifp);
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IFQ_LOCK(&ifp->if_snd);
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if (IFQ_IS_EMPTY(&ifp->if_snd)) {
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struct epair_softc *sc;
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STAILQ_REMOVE(&epair_dpcpu->epair_ifp_drain_list,
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elm, epair_ifp_drain, ifp_next);
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/* The cached ifp goes off the list. */
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sc = ifp->if_softc;
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EPAIR_REFCOUNT_RELEASE(&sc->refcount);
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EPAIR_REFCOUNT_ASSERT((int)sc->refcount >= 1,
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("%s: ifp=%p sc->refcount not >= 1: %d",
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__func__, ifp, sc->refcount));
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free(elm, M_EPAIR);
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}
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IFQ_UNLOCK(&ifp->if_snd);
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if ((ifp->if_drv_flags & IFF_DRV_OACTIVE) != 0) {
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/* Our "hw"q overflew again. */
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epair_dpcpu->epair_drv_flags |= IFF_DRV_OACTIVE;
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DPRINTF("hw queue length overflow at %u\n",
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epair_nh.nh_qlimit);
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break;
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}
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}
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EPAIR_UNLOCK(epair_dpcpu);
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}
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/*
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* Network interface (`if') related functions.
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*/
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static void
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epair_remove_ifp_from_draining(struct ifnet *ifp)
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{
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struct epair_dpcpu *epair_dpcpu;
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struct epair_ifp_drain *elm, *tvar;
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u_int cpuid;
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CPU_FOREACH(cpuid) {
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epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
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EPAIR_LOCK(epair_dpcpu);
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STAILQ_FOREACH_SAFE(elm, &epair_dpcpu->epair_ifp_drain_list,
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ifp_next, tvar) {
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if (ifp == elm->ifp) {
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struct epair_softc *sc;
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STAILQ_REMOVE(
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&epair_dpcpu->epair_ifp_drain_list, elm,
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epair_ifp_drain, ifp_next);
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/* The cached ifp goes off the list. */
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sc = ifp->if_softc;
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EPAIR_REFCOUNT_RELEASE(&sc->refcount);
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EPAIR_REFCOUNT_ASSERT((int)sc->refcount >= 1,
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("%s: ifp=%p sc->refcount not >= 1: %d",
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__func__, ifp, sc->refcount));
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free(elm, M_EPAIR);
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}
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}
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EPAIR_UNLOCK(epair_dpcpu);
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}
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}
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static int
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epair_add_ifp_for_draining(struct ifnet *ifp)
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{
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struct epair_dpcpu *epair_dpcpu;
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struct epair_softc *sc;
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struct epair_ifp_drain *elm = NULL;
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sc = ifp->if_softc;
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epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
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EPAIR_LOCK_ASSERT(epair_dpcpu);
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STAILQ_FOREACH(elm, &epair_dpcpu->epair_ifp_drain_list, ifp_next)
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if (elm->ifp == ifp)
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break;
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/* If the ifp is there already, return success. */
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if (elm != NULL)
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return (0);
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elm = malloc(sizeof(struct epair_ifp_drain), M_EPAIR, M_NOWAIT|M_ZERO);
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if (elm == NULL)
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return (ENOMEM);
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elm->ifp = ifp;
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/* Add a reference for the ifp pointer on the list. */
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EPAIR_REFCOUNT_AQUIRE(&sc->refcount);
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STAILQ_INSERT_TAIL(&epair_dpcpu->epair_ifp_drain_list, elm, ifp_next);
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return (0);
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}
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static void
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epair_start_locked(struct ifnet *ifp)
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{
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struct epair_dpcpu *epair_dpcpu;
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struct mbuf *m;
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struct epair_softc *sc;
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struct ifnet *oifp;
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int error;
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DPRINTF("ifp=%p\n", ifp);
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sc = ifp->if_softc;
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epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
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EPAIR_LOCK_ASSERT(epair_dpcpu);
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if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
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return;
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if ((ifp->if_flags & IFF_UP) == 0)
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return;
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/*
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* We get patckets here from ether_output via if_handoff()
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* and ned to put them into the input queue of the oifp
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* and call oifp->if_input() via netisr/epair_sintr().
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*/
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oifp = sc->oifp;
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sc = oifp->if_softc;
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for (;;) {
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IFQ_DEQUEUE(&ifp->if_snd, m);
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if (m == NULL)
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break;
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BPF_MTAP(ifp, m);
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/*
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* In case the outgoing interface is not usable,
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* drop the packet.
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*/
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if ((oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
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(oifp->if_flags & IFF_UP) ==0) {
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ifp->if_oerrors++;
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m_freem(m);
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continue;
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}
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DPRINTF("packet %s -> %s\n", ifp->if_xname, oifp->if_xname);
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/*
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* Add a reference so the interface cannot go while the
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* packet is in transit as we rely on rcvif to stay valid.
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*/
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EPAIR_REFCOUNT_AQUIRE(&sc->refcount);
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m->m_pkthdr.rcvif = oifp;
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CURVNET_SET_QUIET(oifp->if_vnet);
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error = netisr_queue(NETISR_EPAIR, m);
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CURVNET_RESTORE();
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if (!error) {
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ifp->if_opackets++;
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/* Someone else received the packet. */
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oifp->if_ipackets++;
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} else {
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/* The packet was freed already. */
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epair_dpcpu->epair_drv_flags |= IFF_DRV_OACTIVE;
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ifp->if_drv_flags |= IFF_DRV_OACTIVE;
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(void) epair_add_ifp_for_draining(ifp);
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ifp->if_oerrors++;
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EPAIR_REFCOUNT_RELEASE(&sc->refcount);
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EPAIR_REFCOUNT_ASSERT((int)sc->refcount >= 1,
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("%s: ifp=%p sc->refcount not >= 1: %d",
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__func__, oifp, sc->refcount));
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}
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}
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}
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static void
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epair_start(struct ifnet *ifp)
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{
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struct epair_dpcpu *epair_dpcpu;
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epair_dpcpu = DPCPU_ID_PTR(cpuid_from_ifp(ifp), epair_dpcpu);
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EPAIR_LOCK(epair_dpcpu);
|
|
epair_start_locked(ifp);
|
|
EPAIR_UNLOCK(epair_dpcpu);
|
|
}
|
|
|
|
static int
|
|
epair_transmit_locked(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct epair_dpcpu *epair_dpcpu;
|
|
struct epair_softc *sc;
|
|
struct ifnet *oifp;
|
|
int error, len;
|
|
short mflags;
|
|
|
|
DPRINTF("ifp=%p m=%p\n", ifp, m);
|
|
sc = ifp->if_softc;
|
|
epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
|
|
EPAIR_LOCK_ASSERT(epair_dpcpu);
|
|
|
|
if (m == NULL)
|
|
return (0);
|
|
|
|
/*
|
|
* We are not going to use the interface en/dequeue mechanism
|
|
* on the TX side. We are called from ether_output_frame()
|
|
* and will put the packet into the incoming queue of the
|
|
* other interface of our pair via the netsir.
|
|
*/
|
|
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
|
|
m_freem(m);
|
|
return (ENXIO);
|
|
}
|
|
if ((ifp->if_flags & IFF_UP) == 0) {
|
|
m_freem(m);
|
|
return (ENETDOWN);
|
|
}
|
|
|
|
BPF_MTAP(ifp, m);
|
|
|
|
/*
|
|
* In case the outgoing interface is not usable,
|
|
* drop the packet.
|
|
*/
|
|
oifp = sc->oifp;
|
|
if ((oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
|
|
(oifp->if_flags & IFF_UP) ==0) {
|
|
ifp->if_oerrors++;
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
len = m->m_pkthdr.len;
|
|
mflags = m->m_flags;
|
|
DPRINTF("packet %s -> %s\n", ifp->if_xname, oifp->if_xname);
|
|
|
|
#ifdef ALTQ
|
|
/* Support ALTQ via the clasic if_start() path. */
|
|
IF_LOCK(&ifp->if_snd);
|
|
if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
|
|
ALTQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
|
|
if (error)
|
|
ifp->if_snd.ifq_drops++;
|
|
IF_UNLOCK(&ifp->if_snd);
|
|
if (!error) {
|
|
ifp->if_obytes += len;
|
|
if (mflags & (M_BCAST|M_MCAST))
|
|
ifp->if_omcasts++;
|
|
|
|
if ((ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
|
|
epair_start_locked(ifp);
|
|
else
|
|
(void)epair_add_ifp_for_draining(ifp);
|
|
}
|
|
return (error);
|
|
}
|
|
IF_UNLOCK(&ifp->if_snd);
|
|
#endif
|
|
|
|
if ((epair_dpcpu->epair_drv_flags & IFF_DRV_OACTIVE) != 0) {
|
|
/*
|
|
* Our hardware queue is full, try to fall back
|
|
* queuing to the ifq but do not call ifp->if_start.
|
|
* Either we are lucky or the packet is gone.
|
|
*/
|
|
IFQ_ENQUEUE(&ifp->if_snd, m, error);
|
|
if (!error)
|
|
(void)epair_add_ifp_for_draining(ifp);
|
|
return (error);
|
|
}
|
|
sc = oifp->if_softc;
|
|
/*
|
|
* Add a reference so the interface cannot go while the
|
|
* packet is in transit as we rely on rcvif to stay valid.
|
|
*/
|
|
EPAIR_REFCOUNT_AQUIRE(&sc->refcount);
|
|
m->m_pkthdr.rcvif = oifp;
|
|
CURVNET_SET_QUIET(oifp->if_vnet);
|
|
error = netisr_queue(NETISR_EPAIR, m);
|
|
CURVNET_RESTORE();
|
|
if (!error) {
|
|
ifp->if_opackets++;
|
|
/*
|
|
* IFQ_HANDOFF_ADJ/ip_handoff() update statistics,
|
|
* but as we bypass all this we have to duplicate
|
|
* the logic another time.
|
|
*/
|
|
ifp->if_obytes += len;
|
|
if (mflags & (M_BCAST|M_MCAST))
|
|
ifp->if_omcasts++;
|
|
/* Someone else received the packet. */
|
|
oifp->if_ipackets++;
|
|
} else {
|
|
/* The packet was freed already. */
|
|
epair_dpcpu->epair_drv_flags |= IFF_DRV_OACTIVE;
|
|
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
|
|
ifp->if_oerrors++;
|
|
EPAIR_REFCOUNT_RELEASE(&sc->refcount);
|
|
EPAIR_REFCOUNT_ASSERT((int)sc->refcount >= 1,
|
|
("%s: ifp=%p sc->refcount not >= 1: %d",
|
|
__func__, oifp, sc->refcount));
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
epair_transmit(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct epair_dpcpu *epair_dpcpu;
|
|
int error;
|
|
|
|
epair_dpcpu = DPCPU_ID_PTR(cpuid_from_ifp(ifp), epair_dpcpu);
|
|
EPAIR_LOCK(epair_dpcpu);
|
|
error = epair_transmit_locked(ifp, m);
|
|
EPAIR_UNLOCK(epair_dpcpu);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
epair_qflush(struct ifnet *ifp)
|
|
{
|
|
struct epair_softc *sc;
|
|
|
|
sc = ifp->if_softc;
|
|
KASSERT(sc != NULL, ("%s: ifp=%p, epair_softc gone? sc=%p\n",
|
|
__func__, ifp, sc));
|
|
/*
|
|
* Remove this ifp from all backpointer lists. The interface will not
|
|
* usable for flushing anyway nor should it have anything to flush
|
|
* after if_qflush().
|
|
*/
|
|
epair_remove_ifp_from_draining(ifp);
|
|
|
|
if (sc->if_qflush)
|
|
sc->if_qflush(ifp);
|
|
}
|
|
|
|
static int
|
|
epair_media_change(struct ifnet *ifp __unused)
|
|
{
|
|
|
|
/* Do nothing. */
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
epair_media_status(struct ifnet *ifp __unused, struct ifmediareq *imr)
|
|
{
|
|
|
|
imr->ifm_status = IFM_AVALID | IFM_ACTIVE;
|
|
imr->ifm_active = IFM_ETHER | IFM_10G_T | IFM_FDX;
|
|
}
|
|
|
|
static int
|
|
epair_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct epair_softc *sc;
|
|
struct ifreq *ifr;
|
|
int error;
|
|
|
|
ifr = (struct ifreq *)data;
|
|
switch (cmd) {
|
|
case SIOCSIFFLAGS:
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
error = 0;
|
|
break;
|
|
|
|
case SIOCSIFMEDIA:
|
|
case SIOCGIFMEDIA:
|
|
sc = ifp->if_softc;
|
|
error = ifmedia_ioctl(ifp, ifr, &sc->media, cmd);
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
/* We basically allow all kinds of MTUs. */
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
error = 0;
|
|
break;
|
|
|
|
default:
|
|
/* Let the common ethernet handler process this. */
|
|
error = ether_ioctl(ifp, cmd, data);
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
epair_init(void *dummy __unused)
|
|
{
|
|
}
|
|
|
|
|
|
/*
|
|
* Interface cloning functions.
|
|
* We use our private ones so that we can create/destroy our secondary
|
|
* device along with the primary one.
|
|
*/
|
|
static int
|
|
epair_clone_match(struct if_clone *ifc, const char *name)
|
|
{
|
|
const char *cp;
|
|
|
|
DPRINTF("name='%s'\n", name);
|
|
|
|
/*
|
|
* Our base name is epair.
|
|
* Our interfaces will be named epair<n>[ab].
|
|
* So accept anything of the following list:
|
|
* - epair
|
|
* - epair<n>
|
|
* but not the epair<n>[ab] versions.
|
|
*/
|
|
if (strncmp(epairname, name, sizeof(epairname)-1) != 0)
|
|
return (0);
|
|
|
|
for (cp = name + sizeof(epairname) - 1; *cp != '\0'; cp++) {
|
|
if (*cp < '0' || *cp > '9')
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
|
|
{
|
|
struct epair_softc *sca, *scb;
|
|
struct ifnet *ifp;
|
|
char *dp;
|
|
int error, unit, wildcard;
|
|
uint8_t eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
|
|
|
|
/*
|
|
* We are abusing params to create our second interface.
|
|
* Actually we already created it and called if_clone_create()
|
|
* for it to do the official insertion procedure the moment we knew
|
|
* it cannot fail anymore. So just do attach it here.
|
|
*/
|
|
if (params) {
|
|
scb = (struct epair_softc *)params;
|
|
ifp = scb->ifp;
|
|
/* Assign a hopefully unique, locally administered etheraddr. */
|
|
eaddr[0] = 0x02;
|
|
eaddr[3] = (ifp->if_index >> 8) & 0xff;
|
|
eaddr[4] = ifp->if_index & 0xff;
|
|
eaddr[5] = 0x0b;
|
|
ether_ifattach(ifp, eaddr);
|
|
/* Correctly set the name for the cloner list. */
|
|
strlcpy(name, scb->ifp->if_xname, len);
|
|
return (0);
|
|
}
|
|
|
|
/* Try to see if a special unit was requested. */
|
|
error = ifc_name2unit(name, &unit);
|
|
if (error != 0)
|
|
return (error);
|
|
wildcard = (unit < 0);
|
|
|
|
error = ifc_alloc_unit(ifc, &unit);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* If no unit had been given, we need to adjust the ifName.
|
|
* Also make sure there is space for our extra [ab] suffix.
|
|
*/
|
|
for (dp = name; *dp != '\0'; dp++);
|
|
if (wildcard) {
|
|
error = snprintf(dp, len - (dp - name), "%d", unit);
|
|
if (error > len - (dp - name) - 1) {
|
|
/* ifName too long. */
|
|
ifc_free_unit(ifc, unit);
|
|
return (ENOSPC);
|
|
}
|
|
dp += error;
|
|
}
|
|
if (len - (dp - name) - 1 < 1) {
|
|
/* No space left for our [ab] suffix. */
|
|
ifc_free_unit(ifc, unit);
|
|
return (ENOSPC);
|
|
}
|
|
*dp = 'a';
|
|
/* Must not change dp so we can replace 'a' by 'b' later. */
|
|
*(dp+1) = '\0';
|
|
|
|
/* Allocate memory for both [ab] interfaces */
|
|
sca = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
|
|
EPAIR_REFCOUNT_INIT(&sca->refcount, 1);
|
|
sca->ifp = if_alloc(IFT_ETHER);
|
|
if (sca->ifp == NULL) {
|
|
free(sca, M_EPAIR);
|
|
ifc_free_unit(ifc, unit);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
scb = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
|
|
EPAIR_REFCOUNT_INIT(&scb->refcount, 1);
|
|
scb->ifp = if_alloc(IFT_ETHER);
|
|
if (scb->ifp == NULL) {
|
|
free(scb, M_EPAIR);
|
|
if_free(sca->ifp);
|
|
free(sca, M_EPAIR);
|
|
ifc_free_unit(ifc, unit);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
/*
|
|
* Cross-reference the interfaces so we will be able to free both.
|
|
*/
|
|
sca->oifp = scb->ifp;
|
|
scb->oifp = sca->ifp;
|
|
|
|
/*
|
|
* Calculate the cpuid for netisr queueing based on the
|
|
* ifIndex of the interfaces. As long as we cannot configure
|
|
* this or use cpuset information easily we cannot guarantee
|
|
* cache locality but we can at least allow parallelism.
|
|
*/
|
|
sca->cpuid =
|
|
netisr_get_cpuid(sca->ifp->if_index % netisr_get_cpucount());
|
|
scb->cpuid =
|
|
netisr_get_cpuid(scb->ifp->if_index % netisr_get_cpucount());
|
|
|
|
/* Finish initialization of interface <n>a. */
|
|
ifp = sca->ifp;
|
|
ifp->if_softc = sca;
|
|
strlcpy(ifp->if_xname, name, IFNAMSIZ);
|
|
ifp->if_dname = epairname;
|
|
ifp->if_dunit = unit;
|
|
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
|
|
ifp->if_capabilities = IFCAP_VLAN_MTU;
|
|
ifp->if_capenable = IFCAP_VLAN_MTU;
|
|
ifp->if_start = epair_start;
|
|
ifp->if_ioctl = epair_ioctl;
|
|
ifp->if_init = epair_init;
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
/* Assign a hopefully unique, locally administered etheraddr. */
|
|
eaddr[0] = 0x02;
|
|
eaddr[3] = (ifp->if_index >> 8) & 0xff;
|
|
eaddr[4] = ifp->if_index & 0xff;
|
|
eaddr[5] = 0x0a;
|
|
ether_ifattach(ifp, eaddr);
|
|
sca->if_qflush = ifp->if_qflush;
|
|
ifp->if_qflush = epair_qflush;
|
|
ifp->if_transmit = epair_transmit;
|
|
if_initbaudrate(ifp, IF_Gbps(10)); /* arbitrary maximum */
|
|
|
|
/* Swap the name and finish initialization of interface <n>b. */
|
|
*dp = 'b';
|
|
|
|
ifp = scb->ifp;
|
|
ifp->if_softc = scb;
|
|
strlcpy(ifp->if_xname, name, IFNAMSIZ);
|
|
ifp->if_dname = epairname;
|
|
ifp->if_dunit = unit;
|
|
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
|
|
ifp->if_capabilities = IFCAP_VLAN_MTU;
|
|
ifp->if_capenable = IFCAP_VLAN_MTU;
|
|
ifp->if_start = epair_start;
|
|
ifp->if_ioctl = epair_ioctl;
|
|
ifp->if_init = epair_init;
|
|
ifp->if_snd.ifq_maxlen = ifqmaxlen;
|
|
/* We need to play some tricks here for the second interface. */
|
|
strlcpy(name, epairname, len);
|
|
error = if_clone_create(name, len, (caddr_t)scb);
|
|
if (error)
|
|
panic("%s: if_clone_create() for our 2nd iface failed: %d",
|
|
__func__, error);
|
|
scb->if_qflush = ifp->if_qflush;
|
|
ifp->if_qflush = epair_qflush;
|
|
ifp->if_transmit = epair_transmit;
|
|
if_initbaudrate(ifp, IF_Gbps(10)); /* arbitrary maximum */
|
|
|
|
/*
|
|
* Restore name to <n>a as the ifp for this will go into the
|
|
* cloner list for the initial call.
|
|
*/
|
|
strlcpy(name, sca->ifp->if_xname, len);
|
|
DPRINTF("name='%s/%db' created sca=%p scb=%p\n", name, unit, sca, scb);
|
|
|
|
/* Initialise pseudo media types. */
|
|
ifmedia_init(&sca->media, 0, epair_media_change, epair_media_status);
|
|
ifmedia_add(&sca->media, IFM_ETHER | IFM_10G_T, 0, NULL);
|
|
ifmedia_set(&sca->media, IFM_ETHER | IFM_10G_T);
|
|
ifmedia_init(&scb->media, 0, epair_media_change, epair_media_status);
|
|
ifmedia_add(&scb->media, IFM_ETHER | IFM_10G_T, 0, NULL);
|
|
ifmedia_set(&scb->media, IFM_ETHER | IFM_10G_T);
|
|
|
|
/* Tell the world, that we are ready to rock. */
|
|
sca->ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
scb->ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
if_link_state_change(sca->ifp, LINK_STATE_UP);
|
|
if_link_state_change(scb->ifp, LINK_STATE_UP);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
epair_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
|
|
{
|
|
struct ifnet *oifp;
|
|
struct epair_softc *sca, *scb;
|
|
int unit, error;
|
|
|
|
DPRINTF("ifp=%p\n", ifp);
|
|
|
|
/*
|
|
* In case we called into if_clone_destroyif() ourselves
|
|
* again to remove the second interface, the softc will be
|
|
* NULL. In that case so not do anything but return success.
|
|
*/
|
|
if (ifp->if_softc == NULL)
|
|
return (0);
|
|
|
|
unit = ifp->if_dunit;
|
|
sca = ifp->if_softc;
|
|
oifp = sca->oifp;
|
|
scb = oifp->if_softc;
|
|
|
|
DPRINTF("ifp=%p oifp=%p\n", ifp, oifp);
|
|
if_link_state_change(ifp, LINK_STATE_DOWN);
|
|
if_link_state_change(oifp, LINK_STATE_DOWN);
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
oifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
|
|
/*
|
|
* Get rid of our second half. As the other of the two
|
|
* interfaces may reside in a different vnet, we need to
|
|
* switch before freeing them.
|
|
*/
|
|
CURVNET_SET_QUIET(oifp->if_vnet);
|
|
ether_ifdetach(oifp);
|
|
/*
|
|
* Wait for all packets to be dispatched to if_input.
|
|
* The numbers can only go down as the interface is
|
|
* detached so there is no need to use atomics.
|
|
*/
|
|
DPRINTF("scb refcnt=%u\n", scb->refcount);
|
|
EPAIR_REFCOUNT_ASSERT(scb->refcount == 1,
|
|
("%s: ifp=%p scb->refcount!=1: %d", __func__, oifp, scb->refcount));
|
|
oifp->if_softc = NULL;
|
|
error = if_clone_destroyif(ifc, oifp);
|
|
if (error)
|
|
panic("%s: if_clone_destroyif() for our 2nd iface failed: %d",
|
|
__func__, error);
|
|
if_free(oifp);
|
|
ifmedia_removeall(&scb->media);
|
|
free(scb, M_EPAIR);
|
|
CURVNET_RESTORE();
|
|
|
|
ether_ifdetach(ifp);
|
|
/*
|
|
* Wait for all packets to be dispatched to if_input.
|
|
*/
|
|
DPRINTF("sca refcnt=%u\n", sca->refcount);
|
|
EPAIR_REFCOUNT_ASSERT(sca->refcount == 1,
|
|
("%s: ifp=%p sca->refcount!=1: %d", __func__, ifp, sca->refcount));
|
|
if_free(ifp);
|
|
ifmedia_removeall(&sca->media);
|
|
free(sca, M_EPAIR);
|
|
ifc_free_unit(ifc, unit);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
epair_modevent(module_t mod, int type, void *data)
|
|
{
|
|
int qlimit;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
/* For now limit us to one global mutex and one inq. */
|
|
epair_dpcpu_init();
|
|
epair_nh.nh_qlimit = 42 * ifqmaxlen; /* 42 shall be the number. */
|
|
if (TUNABLE_INT_FETCH("net.link.epair.netisr_maxqlen", &qlimit))
|
|
epair_nh.nh_qlimit = qlimit;
|
|
netisr_register(&epair_nh);
|
|
epair_cloner = if_clone_advanced(epairname, 0,
|
|
epair_clone_match, epair_clone_create, epair_clone_destroy);
|
|
if (bootverbose)
|
|
printf("%s initialized.\n", epairname);
|
|
break;
|
|
case MOD_UNLOAD:
|
|
if_clone_detach(epair_cloner);
|
|
netisr_unregister(&epair_nh);
|
|
epair_dpcpu_detach();
|
|
if (bootverbose)
|
|
printf("%s unloaded.\n", epairname);
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static moduledata_t epair_mod = {
|
|
"if_epair",
|
|
epair_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(if_epair, epair_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_epair, 1);
|