2 * Copyright (c) 2014 Chelsio Communications, Inc.
4 * Written by: Navdeep Parhar <np@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
31 #ifndef __CXGBE_MP_RING_H
32 #define __CXGBE_MP_RING_H
35 #error "no user-serviceable parts inside"
39 typedef u_int (*ring_drain_t)(struct mp_ring *, u_int, u_int);
40 typedef u_int (*ring_can_drain_t)(struct mp_ring *);
43 volatile uint64_t state __aligned(CACHE_LINE_SIZE);
45 int size __aligned(CACHE_LINE_SIZE);
47 struct malloc_type * mt;
49 ring_can_drain_t can_drain; /* cheap, may be unreliable */
50 counter_u64_t enqueues;
54 counter_u64_t restarts; /* recovered after stalling */
55 counter_u64_t abdications;
57 void * volatile items[] __aligned(CACHE_LINE_SIZE);
60 int mp_ring_alloc(struct mp_ring **, int, void *, ring_drain_t,
61 ring_can_drain_t, struct malloc_type *, int);
62 void mp_ring_free(struct mp_ring *);
63 int mp_ring_enqueue(struct mp_ring *, void **, int, int);
64 void mp_ring_check_drainage(struct mp_ring *, int);
65 void mp_ring_reset_stats(struct mp_ring *);
66 int mp_ring_is_idle(struct mp_ring *);