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: releng/11.1/sys/net/mp_ring.h 300113 2016-05-18 04:35:58Z scottl $
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 struct ifmp_ring {
44 volatile uint64_t state __aligned(CACHE_LINE_SIZE);
45
46 int size __aligned(CACHE_LINE_SIZE);
47 void * cookie;
48 struct malloc_type * mt;
49 mp_ring_drain_t drain;
50 mp_ring_can_drain_t can_drain; /* cheap, may be unreliable */
51 counter_u64_t enqueues;
52 counter_u64_t drops;
53 counter_u64_t starts;
54 counter_u64_t stalls;
55 counter_u64_t restarts; /* recovered after stalling */
56 counter_u64_t abdications;
57 #ifdef NO_64BIT_ATOMICS
58 struct mtx lock;
59 #endif
60 void * volatile items[] __aligned(CACHE_LINE_SIZE);
61 };
62
63 int ifmp_ring_alloc(struct ifmp_ring **, int, void *, mp_ring_drain_t,
64 mp_ring_can_drain_t, struct malloc_type *, int);
65 void ifmp_ring_free(struct ifmp_ring *);
66 int ifmp_ring_enqueue(struct ifmp_ring *, void **, int, int);
67 void ifmp_ring_check_drainage(struct ifmp_ring *, int);
68 void ifmp_ring_reset_stats(struct ifmp_ring *);
69 int ifmp_ring_is_idle(struct ifmp_ring *);
70 int ifmp_ring_is_stalled(struct ifmp_ring *r);
71 #endif
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