1*4c7070dbSScott Long /*- 2*4c7070dbSScott Long * Copyright (c) 2014 Chelsio Communications, Inc. 3*4c7070dbSScott Long * All rights reserved. 4*4c7070dbSScott Long * Written by: Navdeep Parhar <np@FreeBSD.org> 5*4c7070dbSScott Long * 6*4c7070dbSScott Long * Redistribution and use in source and binary forms, with or without 7*4c7070dbSScott Long * modification, are permitted provided that the following conditions 8*4c7070dbSScott Long * are met: 9*4c7070dbSScott Long * 1. Redistributions of source code must retain the above copyright 10*4c7070dbSScott Long * notice, this list of conditions and the following disclaimer. 11*4c7070dbSScott Long * 2. Redistributions in binary form must reproduce the above copyright 12*4c7070dbSScott Long * notice, this list of conditions and the following disclaimer in the 13*4c7070dbSScott Long * documentation and/or other materials provided with the distribution. 14*4c7070dbSScott Long * 15*4c7070dbSScott Long * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16*4c7070dbSScott Long * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17*4c7070dbSScott Long * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18*4c7070dbSScott Long * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19*4c7070dbSScott Long * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20*4c7070dbSScott Long * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21*4c7070dbSScott Long * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22*4c7070dbSScott Long * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23*4c7070dbSScott Long * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24*4c7070dbSScott Long * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25*4c7070dbSScott Long * SUCH DAMAGE. 26*4c7070dbSScott Long * 27*4c7070dbSScott Long * $FreeBSD$ 28*4c7070dbSScott Long * 29*4c7070dbSScott Long */ 30*4c7070dbSScott Long 31*4c7070dbSScott Long #ifndef __NET_MP_RING_H 32*4c7070dbSScott Long #define __NET_MP_RING_H 33*4c7070dbSScott Long 34*4c7070dbSScott Long #ifndef _KERNEL 35*4c7070dbSScott Long #error "no user-serviceable parts inside" 36*4c7070dbSScott Long #endif 37*4c7070dbSScott Long 38*4c7070dbSScott Long struct ifmp_ring; 39*4c7070dbSScott Long typedef u_int (*mp_ring_drain_t)(struct ifmp_ring *, u_int, u_int); 40*4c7070dbSScott Long typedef u_int (*mp_ring_can_drain_t)(struct ifmp_ring *); 41*4c7070dbSScott Long typedef void (*mp_ring_serial_t)(struct ifmp_ring *); 42*4c7070dbSScott Long 43*4c7070dbSScott Long struct ifmp_ring { 44*4c7070dbSScott Long volatile uint64_t state __aligned(CACHE_LINE_SIZE); 45*4c7070dbSScott Long 46*4c7070dbSScott Long int size __aligned(CACHE_LINE_SIZE); 47*4c7070dbSScott Long void * cookie; 48*4c7070dbSScott Long struct malloc_type * mt; 49*4c7070dbSScott Long mp_ring_drain_t drain; 50*4c7070dbSScott Long mp_ring_can_drain_t can_drain; /* cheap, may be unreliable */ 51*4c7070dbSScott Long counter_u64_t enqueues; 52*4c7070dbSScott Long counter_u64_t drops; 53*4c7070dbSScott Long counter_u64_t starts; 54*4c7070dbSScott Long counter_u64_t stalls; 55*4c7070dbSScott Long counter_u64_t restarts; /* recovered after stalling */ 56*4c7070dbSScott Long counter_u64_t abdications; 57*4c7070dbSScott Long #ifdef NO_64BIT_ATOMICS 58*4c7070dbSScott Long struct mtx lock; 59*4c7070dbSScott Long #endif 60*4c7070dbSScott Long void * volatile items[] __aligned(CACHE_LINE_SIZE); 61*4c7070dbSScott Long }; 62*4c7070dbSScott Long 63*4c7070dbSScott Long int ifmp_ring_alloc(struct ifmp_ring **, int, void *, mp_ring_drain_t, 64*4c7070dbSScott Long mp_ring_can_drain_t, struct malloc_type *, int); 65*4c7070dbSScott Long void ifmp_ring_free(struct ifmp_ring *); 66*4c7070dbSScott Long int ifmp_ring_enqueue(struct ifmp_ring *, void **, int, int); 67*4c7070dbSScott Long void ifmp_ring_check_drainage(struct ifmp_ring *, int); 68*4c7070dbSScott Long void ifmp_ring_reset_stats(struct ifmp_ring *); 69*4c7070dbSScott Long int ifmp_ring_is_idle(struct ifmp_ring *); 70*4c7070dbSScott Long int ifmp_ring_is_stalled(struct ifmp_ring *r); 71*4c7070dbSScott Long #endif 72