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before adding/removing packets from the queue. Also, the if_obytes and if_omcasts fields should only be manipulated under protection of the mutex. IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on the queue. An IF_LOCK macro is provided, as well as the old (mutex-less) versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which needs them, but their use is discouraged. Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF, which takes care of locking/enqueue, and also statistics updating/start if necessary.
101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*-
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* Copyright (c) 2000 Brian Somers <brian@Awfulhak.org>
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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
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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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/netisr.h>
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#include <net/intrq.h>
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/*
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* If the appropriate intrq_present variable is zero, don't use
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* the queue (as it'll never get processed).
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* When defined, each of the network stacks declares their own
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* *intrq_present variable to be non-zero.
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*/
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const int atintrq1_present;
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const int atintrq2_present;
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const int atmintrq_present;
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const int ipintrq_present;
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const int ip6intrq_present;
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const int ipxintrq_present;
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const int natmintrq_present;
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const int nsintrq_present;
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struct ifqueue atintrq1;
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struct ifqueue atintrq2;
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struct ifqueue atm_intrq;
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struct ifqueue ipintrq;
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struct ifqueue ip6intrq;
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struct ifqueue ipxintrq;
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struct ifqueue natmintrq;
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struct ifqueue nsintrq;
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static const struct {
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sa_family_t family;
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struct ifqueue *q;
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int const *present;
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int isr;
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} queue[] = {
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{ AF_ATM, &atm_intrq, &atmintrq_present, NETISR_ATM },
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{ AF_INET, &ipintrq, &ipintrq_present, NETISR_IP },
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{ AF_INET6, &ip6intrq, &ip6intrq_present, NETISR_IPV6 },
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{ AF_IPX, &ipxintrq, &ipxintrq_present, NETISR_IPX },
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{ AF_NATM, &natmintrq, &natmintrq_present, NETISR_NATM },
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{ AF_APPLETALK, &atintrq2, &atintrq2_present, NETISR_ATALK },
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{ AF_NS, &nsintrq, &nsintrq_present, NETISR_NS }
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};
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int
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family_enqueue(family, m)
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sa_family_t family;
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struct mbuf *m;
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{
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int entry;
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for (entry = 0; entry < sizeof queue / sizeof queue[0]; entry++)
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if (queue[entry].family == family) {
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if (queue[entry].present) {
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if (! IF_HANDOFF(queue[entry].q, m, NULL))
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return ENOBUFS;
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schednetisr(queue[entry].isr);
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return 0;
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} else
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break;
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}
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m_freem(m);
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return EAFNOSUPPORT;
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}
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