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- /*-
- * 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
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