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