772e66a6fc
discontinued by its initial authors. In FreeBSD the code was already slightly edited during the pf(4) SMP project. It is about to be edited more in the projects/ifnet. Moving out of contrib also allows to remove several hacks to the make glue. Reviewed by: net@
485 lines
12 KiB
C
485 lines
12 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. 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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* From: @(#)if.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_IFQ_H_
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#define _NET_IFQ_H_
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#ifdef _KERNEL
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#include <sys/mbuf.h> /* ifqueue only? */
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#include <sys/buf_ring.h>
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#include <net/vnet.h>
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#endif /* _KERNEL */
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#include <sys/lock.h> /* XXX */
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#include <sys/mutex.h> /* struct ifqueue */
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/*
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* Couple of ugly extra definitions that are required since ifq.h
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* is splitted from if_var.h.
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*/
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#define IF_DUNIT_NONE -1
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#include <net/altq/if_altq.h>
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/*
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* Structure defining a queue for a network interface.
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*/
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struct ifqueue {
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struct mbuf *ifq_head;
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struct mbuf *ifq_tail;
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int ifq_len;
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int ifq_maxlen;
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struct mtx ifq_mtx;
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};
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#ifdef _KERNEL
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/*
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* Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
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* are queues of messages stored on ifqueue structures
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* (defined above). Entries are added to and deleted from these structures
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* by these macros.
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*/
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#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx)
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#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx)
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#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
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#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
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#define _IF_QLEN(ifq) ((ifq)->ifq_len)
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#define _IF_ENQUEUE(ifq, m) do { \
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(m)->m_nextpkt = NULL; \
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if ((ifq)->ifq_tail == NULL) \
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(ifq)->ifq_head = m; \
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else \
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(ifq)->ifq_tail->m_nextpkt = m; \
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(ifq)->ifq_tail = m; \
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(ifq)->ifq_len++; \
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} while (0)
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#define IF_ENQUEUE(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_ENQUEUE(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define _IF_PREPEND(ifq, m) do { \
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(m)->m_nextpkt = (ifq)->ifq_head; \
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if ((ifq)->ifq_tail == NULL) \
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(ifq)->ifq_tail = (m); \
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(ifq)->ifq_head = (m); \
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(ifq)->ifq_len++; \
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} while (0)
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#define IF_PREPEND(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_PREPEND(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define _IF_DEQUEUE(ifq, m) do { \
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(m) = (ifq)->ifq_head; \
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if (m) { \
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if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
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(ifq)->ifq_tail = NULL; \
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(m)->m_nextpkt = NULL; \
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(ifq)->ifq_len--; \
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} \
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} while (0)
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#define IF_DEQUEUE(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_DEQUEUE(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define _IF_DEQUEUE_ALL(ifq, m) do { \
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(m) = (ifq)->ifq_head; \
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(ifq)->ifq_head = (ifq)->ifq_tail = NULL; \
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(ifq)->ifq_len = 0; \
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} while (0)
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#define IF_DEQUEUE_ALL(ifq, m) do { \
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IF_LOCK(ifq); \
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_IF_DEQUEUE_ALL(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
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#define IF_POLL(ifq, m) _IF_POLL(ifq, m)
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#define _IF_DRAIN(ifq) do { \
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struct mbuf *m; \
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for (;;) { \
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_IF_DEQUEUE(ifq, m); \
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if (m == NULL) \
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break; \
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m_freem(m); \
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} \
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} while (0)
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#define IF_DRAIN(ifq) do { \
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IF_LOCK(ifq); \
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_IF_DRAIN(ifq); \
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IF_UNLOCK(ifq); \
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} while(0)
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int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
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int adjust);
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#define IF_HANDOFF(ifq, m, ifp) \
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if_handoff((struct ifqueue *)ifq, m, ifp, 0)
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#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \
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if_handoff((struct ifqueue *)ifq, m, ifp, adj)
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void if_start(struct ifnet *);
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#define IFQ_ENQUEUE(ifq, m, err) \
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do { \
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IF_LOCK(ifq); \
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if (ALTQ_IS_ENABLED(ifq)) \
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ALTQ_ENQUEUE(ifq, m, NULL, err); \
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else { \
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if (_IF_QFULL(ifq)) { \
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m_freem(m); \
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(err) = ENOBUFS; \
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} else { \
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_IF_ENQUEUE(ifq, m); \
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(err) = 0; \
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} \
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} \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_DEQUEUE_NOLOCK(ifq, m) \
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do { \
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if (TBR_IS_ENABLED(ifq)) \
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(m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \
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else if (ALTQ_IS_ENABLED(ifq)) \
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ALTQ_DEQUEUE(ifq, m); \
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else \
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_IF_DEQUEUE(ifq, m); \
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} while (0)
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#define IFQ_DEQUEUE(ifq, m) \
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do { \
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IF_LOCK(ifq); \
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IFQ_DEQUEUE_NOLOCK(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_POLL_NOLOCK(ifq, m) \
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do { \
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if (TBR_IS_ENABLED(ifq)) \
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(m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \
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else if (ALTQ_IS_ENABLED(ifq)) \
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ALTQ_POLL(ifq, m); \
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else \
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_IF_POLL(ifq, m); \
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} while (0)
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#define IFQ_POLL(ifq, m) \
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do { \
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IF_LOCK(ifq); \
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IFQ_POLL_NOLOCK(ifq, m); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_PURGE_NOLOCK(ifq) \
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do { \
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if (ALTQ_IS_ENABLED(ifq)) { \
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ALTQ_PURGE(ifq); \
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} else \
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_IF_DRAIN(ifq); \
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} while (0)
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#define IFQ_PURGE(ifq) \
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do { \
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IF_LOCK(ifq); \
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IFQ_PURGE_NOLOCK(ifq); \
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IF_UNLOCK(ifq); \
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} while (0)
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#define IFQ_SET_READY(ifq) \
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do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
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#define IFQ_LOCK(ifq) IF_LOCK(ifq)
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#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq)
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#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq)
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#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0)
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#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++)
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#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len)
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#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len))
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/*
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* The IFF_DRV_OACTIVE test should really occur in the device driver, not in
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* the handoff logic, as that flag is locked by the device driver.
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*/
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#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \
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do { \
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int len; \
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short mflags; \
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\
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len = (m)->m_pkthdr.len; \
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mflags = (m)->m_flags; \
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IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \
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if ((err) == 0) { \
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if_inc_counter((ifp), IFCOUNTER_OBYTES, len + (adj)); \
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if (mflags & M_MCAST) \
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if_inc_counter((ifp), IFCOUNTER_OMCASTS, 1); \
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if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \
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if_start(ifp); \
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} else \
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if_inc_counter((ifp), IFCOUNTER_OQDROPS, 1); \
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} while (0)
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#define IFQ_HANDOFF(ifp, m, err) \
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IFQ_HANDOFF_ADJ(ifp, m, 0, err)
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#define IFQ_DRV_DEQUEUE(ifq, m) \
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do { \
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(m) = (ifq)->ifq_drv_head; \
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if (m) { \
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if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \
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(ifq)->ifq_drv_tail = NULL; \
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(m)->m_nextpkt = NULL; \
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(ifq)->ifq_drv_len--; \
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} else { \
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IFQ_LOCK(ifq); \
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IFQ_DEQUEUE_NOLOCK(ifq, m); \
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while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \
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struct mbuf *m0; \
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IFQ_DEQUEUE_NOLOCK(ifq, m0); \
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if (m0 == NULL) \
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break; \
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m0->m_nextpkt = NULL; \
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if ((ifq)->ifq_drv_tail == NULL) \
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(ifq)->ifq_drv_head = m0; \
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else \
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(ifq)->ifq_drv_tail->m_nextpkt = m0; \
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(ifq)->ifq_drv_tail = m0; \
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(ifq)->ifq_drv_len++; \
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} \
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IFQ_UNLOCK(ifq); \
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} \
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} while (0)
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#define IFQ_DRV_PREPEND(ifq, m) \
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do { \
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(m)->m_nextpkt = (ifq)->ifq_drv_head; \
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if ((ifq)->ifq_drv_tail == NULL) \
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(ifq)->ifq_drv_tail = (m); \
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(ifq)->ifq_drv_head = (m); \
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(ifq)->ifq_drv_len++; \
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} while (0)
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#define IFQ_DRV_IS_EMPTY(ifq) \
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(((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
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#define IFQ_DRV_PURGE(ifq) \
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do { \
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struct mbuf *m, *n = (ifq)->ifq_drv_head; \
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while((m = n) != NULL) { \
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n = m->m_nextpkt; \
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m_freem(m); \
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} \
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(ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \
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(ifq)->ifq_drv_len = 0; \
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IFQ_PURGE(ifq); \
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} while (0)
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static __inline int
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drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m)
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{
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int error = 0;
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#ifdef ALTQ
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if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
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IFQ_ENQUEUE(&ifp->if_snd, m, error);
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if (error)
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if_inc_counter((ifp), IFCOUNTER_OQDROPS, 1);
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return (error);
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}
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#endif
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error = buf_ring_enqueue(br, m);
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if (error)
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m_freem(m);
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return (error);
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}
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static __inline void
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drbr_putback(struct ifnet *ifp, struct buf_ring *br, struct mbuf *new)
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{
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/*
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* The top of the list needs to be swapped
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* for this one.
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*/
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#ifdef ALTQ
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if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
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/*
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* Peek in altq case dequeued it
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* so put it back.
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*/
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IFQ_DRV_PREPEND(&ifp->if_snd, new);
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return;
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}
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#endif
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buf_ring_putback_sc(br, new);
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}
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static __inline struct mbuf *
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drbr_peek(struct ifnet *ifp, struct buf_ring *br)
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{
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#ifdef ALTQ
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struct mbuf *m;
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if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
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/*
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* Pull it off like a dequeue
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* since drbr_advance() does nothing
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* for altq and drbr_putback() will
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* use the old prepend function.
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*/
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IFQ_DEQUEUE(&ifp->if_snd, m);
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return (m);
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}
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#endif
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return(buf_ring_peek(br));
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}
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static __inline void
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drbr_flush(struct ifnet *ifp, struct buf_ring *br)
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{
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struct mbuf *m;
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#ifdef ALTQ
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if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
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IFQ_PURGE(&ifp->if_snd);
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#endif
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while ((m = buf_ring_dequeue_sc(br)) != NULL)
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m_freem(m);
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}
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static __inline void
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drbr_free(struct buf_ring *br, struct malloc_type *type)
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{
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drbr_flush(NULL, br);
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buf_ring_free(br, type);
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}
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static __inline struct mbuf *
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drbr_dequeue(struct ifnet *ifp, struct buf_ring *br)
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{
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#ifdef ALTQ
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struct mbuf *m;
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if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
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IFQ_DEQUEUE(&ifp->if_snd, m);
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return (m);
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}
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#endif
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return (buf_ring_dequeue_sc(br));
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}
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static __inline void
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drbr_advance(struct ifnet *ifp, struct buf_ring *br)
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{
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#ifdef ALTQ
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/* Nothing to do here since peek dequeues in altq case */
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if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
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return;
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#endif
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return (buf_ring_advance_sc(br));
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}
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static __inline struct mbuf *
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drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br,
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int (*func) (struct mbuf *, void *), void *arg)
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{
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struct mbuf *m;
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#ifdef ALTQ
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if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
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IFQ_LOCK(&ifp->if_snd);
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IFQ_POLL_NOLOCK(&ifp->if_snd, m);
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if (m != NULL && func(m, arg) == 0) {
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IFQ_UNLOCK(&ifp->if_snd);
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return (NULL);
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}
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IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
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IFQ_UNLOCK(&ifp->if_snd);
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return (m);
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}
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#endif
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m = buf_ring_peek(br);
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if (m == NULL || func(m, arg) == 0)
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return (NULL);
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return (buf_ring_dequeue_sc(br));
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}
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static __inline int
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drbr_empty(struct ifnet *ifp, struct buf_ring *br)
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{
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#ifdef ALTQ
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if (ALTQ_IS_ENABLED(&ifp->if_snd))
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return (IFQ_IS_EMPTY(&ifp->if_snd));
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#endif
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return (buf_ring_empty(br));
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}
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static __inline int
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drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br)
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{
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#ifdef ALTQ
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if (ALTQ_IS_ENABLED(&ifp->if_snd))
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return (1);
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#endif
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return (!buf_ring_empty(br));
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}
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static __inline int
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drbr_inuse(struct ifnet *ifp, struct buf_ring *br)
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{
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#ifdef ALTQ
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if (ALTQ_IS_ENABLED(&ifp->if_snd))
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return (ifp->if_snd.ifq_len);
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#endif
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return (buf_ring_count(br));
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}
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extern int ifqmaxlen;
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void if_qflush(struct ifnet *);
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void ifq_init(struct ifaltq *, struct ifnet *ifp);
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void ifq_delete(struct ifaltq *);
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#endif /* _KERNEL */
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#endif /* !_NET_IFQ_H_ */
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