/*-
* Copyright (c) 2014 Chelsio Communications, Inc.
* All rights reserved.
* Written by: Navdeep Parhar <np@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef __NET_MP_RING_H
#define __NET_MP_RING_H
#ifndef _KERNEL
#error "no user-serviceable parts inside"
#endif
struct ifmp_ring;
typedef u_int (*mp_ring_drain_t)(struct ifmp_ring *, u_int, u_int);
typedef u_int (*mp_ring_can_drain_t)(struct ifmp_ring *);
typedef void (*mp_ring_serial_t)(struct ifmp_ring *);
#if defined(__powerpc__) || defined(__i386__)
#define MP_RING_NO_64BIT_ATOMICS
#endif
struct ifmp_ring {
volatile uint64_t state __aligned(CACHE_LINE_SIZE);
int size __aligned(CACHE_LINE_SIZE);
void * cookie;
struct malloc_type * mt;
mp_ring_drain_t drain;
mp_ring_can_drain_t can_drain; /* cheap, may be unreliable */
counter_u64_t enqueues;
counter_u64_t drops;
counter_u64_t starts;
counter_u64_t stalls;
counter_u64_t restarts; /* recovered after stalling */
counter_u64_t abdications;
#ifdef MP_RING_NO_64BIT_ATOMICS
struct mtx lock;
#endif
void * volatile items[] __aligned(CACHE_LINE_SIZE);
};
int ifmp_ring_alloc(struct ifmp_ring **, int, void *, mp_ring_drain_t,
mp_ring_can_drain_t, struct malloc_type *, int);
void ifmp_ring_free(struct ifmp_ring *);
int ifmp_ring_enqueue(struct ifmp_ring *, void **, int, int, int);
void ifmp_ring_check_drainage(struct ifmp_ring *, int);
void ifmp_ring_reset_stats(struct ifmp_ring *);
int ifmp_ring_is_idle(struct ifmp_ring *);
int ifmp_ring_is_stalled(struct ifmp_ring *r);
#endif
plain