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 __CXGBE_MP_RING_H
32 #define __CXGBE_MP_RING_H
33
34 #ifndef _KERNEL
35 #error "no user-serviceable parts inside"
36 #endif
37
38 struct mp_ring;
39 typedef u_int (*ring_drain_t)(struct mp_ring *, u_int, u_int, bool *);
40 typedef u_int (*ring_can_drain_t)(struct mp_ring *);
41
42 struct mp_ring {
43 volatile uint64_t state __aligned(CACHE_LINE_SIZE);
44 struct malloc_type * mt;
45
46 int size __aligned(CACHE_LINE_SIZE);
47 void * cookie;
48 ring_drain_t drain;
49 ring_can_drain_t can_drain; /* cheap, may be unreliable */
50 struct mtx * cons_lock;
51 counter_u64_t dropped;
52 counter_u64_t consumer[4];
53 counter_u64_t not_consumer;
54 counter_u64_t abdications;
55 counter_u64_t consumed;
56 counter_u64_t cons_idle;
57 counter_u64_t cons_idle2;
58 counter_u64_t stalls;
59
60 void * volatile items[] __aligned(CACHE_LINE_SIZE);
61 };
62
63 int mp_ring_alloc(struct mp_ring **, int, void *, ring_drain_t,
64 ring_can_drain_t, struct malloc_type *, struct mtx *, int);
65 void mp_ring_free(struct mp_ring *);
66 int mp_ring_enqueue(struct mp_ring *, void **, int, int);
67 void mp_ring_check_drainage(struct mp_ring *, int);
68 void mp_ring_reset_stats(struct mp_ring *);
69 bool mp_ring_is_idle(struct mp_ring *);
70 void mp_ring_sysctls(struct mp_ring *, struct sysctl_ctx_list *,
71 struct sysctl_oid_list *);
72
73 #endif
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