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5881181d8c
on architectures without 64-bit atomics Reported by: Augustin Cavalier <waddlesplash@gmail.com>
76 lines
2.8 KiB
C
76 lines
2.8 KiB
C
/*-
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* Copyright (c) 2014 Chelsio Communications, Inc.
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* All rights reserved.
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* Written by: Navdeep Parhar <np@FreeBSD.org>
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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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*/
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#ifndef __NET_MP_RING_H
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#define __NET_MP_RING_H
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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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struct ifmp_ring;
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typedef u_int (*mp_ring_drain_t)(struct ifmp_ring *, u_int, u_int);
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typedef u_int (*mp_ring_can_drain_t)(struct ifmp_ring *);
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typedef void (*mp_ring_serial_t)(struct ifmp_ring *);
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#if defined(__powerpc__) || defined(__mips__) || defined(__i386__)
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#define MP_RING_NO_64BIT_ATOMICS
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#endif
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struct ifmp_ring {
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volatile uint64_t state __aligned(CACHE_LINE_SIZE);
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int size __aligned(CACHE_LINE_SIZE);
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void * cookie;
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struct malloc_type * mt;
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mp_ring_drain_t drain;
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mp_ring_can_drain_t can_drain; /* cheap, may be unreliable */
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counter_u64_t enqueues;
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counter_u64_t drops;
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counter_u64_t starts;
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counter_u64_t stalls;
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counter_u64_t restarts; /* recovered after stalling */
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counter_u64_t abdications;
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#ifdef MP_RING_NO_64BIT_ATOMICS
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struct mtx lock;
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#endif
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void * volatile items[] __aligned(CACHE_LINE_SIZE);
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};
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int ifmp_ring_alloc(struct ifmp_ring **, int, void *, mp_ring_drain_t,
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mp_ring_can_drain_t, struct malloc_type *, int);
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void ifmp_ring_free(struct ifmp_ring *);
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int ifmp_ring_enqueue(struct ifmp_ring *, void **, int, int, int);
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void ifmp_ring_check_drainage(struct ifmp_ring *, int);
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void ifmp_ring_reset_stats(struct ifmp_ring *);
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int ifmp_ring_is_idle(struct ifmp_ring *);
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int ifmp_ring_is_stalled(struct ifmp_ring *r);
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#endif
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