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, 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 76