The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/mp_ring.h

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    1 /*-
    2  * Copyright (c) 2014 Chelsio Communications, Inc.
    3  * All rights reserved.
    4  * Written by: Navdeep Parhar <np@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  *
   29  */
   30 
   31 #ifndef __NET_MP_RING_H
   32 #define __NET_MP_RING_H
   33 
   34 #ifndef _KERNEL
   35 #error "no user-serviceable parts inside"
   36 #endif
   37 
   38 struct ifmp_ring;
   39 typedef u_int (*mp_ring_drain_t)(struct ifmp_ring *, u_int, u_int);
   40 typedef u_int (*mp_ring_can_drain_t)(struct ifmp_ring *);
   41 typedef void (*mp_ring_serial_t)(struct ifmp_ring *);
   42 
   43 #if defined(__powerpc__) || defined(__mips__) || defined(__i386__)
   44 #define MP_RING_NO_64BIT_ATOMICS
   45 #endif
   46 
   47 struct ifmp_ring {
   48         volatile uint64_t       state __aligned(CACHE_LINE_SIZE);
   49 
   50         int                     size __aligned(CACHE_LINE_SIZE);
   51         void *                  cookie;
   52         struct malloc_type *    mt;
   53         mp_ring_drain_t         drain;
   54         mp_ring_can_drain_t     can_drain;      /* cheap, may be unreliable */
   55         counter_u64_t           enqueues;
   56         counter_u64_t           drops;
   57         counter_u64_t           starts;
   58         counter_u64_t           stalls;
   59         counter_u64_t           restarts;       /* recovered after stalling */
   60         counter_u64_t           abdications;
   61 #ifdef MP_RING_NO_64BIT_ATOMICS
   62         struct mtx              lock;
   63 #endif
   64         void * volatile         items[] __aligned(CACHE_LINE_SIZE);
   65 };
   66 
   67 int ifmp_ring_alloc(struct ifmp_ring **, int, void *, mp_ring_drain_t,
   68     mp_ring_can_drain_t, struct malloc_type *, int);
   69 void ifmp_ring_free(struct ifmp_ring *);
   70 int ifmp_ring_enqueue(struct ifmp_ring *, void **, int, int);
   71 void ifmp_ring_check_drainage(struct ifmp_ring *, int);
   72 void ifmp_ring_reset_stats(struct ifmp_ring *);
   73 int ifmp_ring_is_idle(struct ifmp_ring *);
   74 int ifmp_ring_is_stalled(struct ifmp_ring *r);
   75 #endif

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