18e0ad55aSJoel Dahl /*- 2*4d846d26SWarner Losh * SPDX-License-Identifier: BSD-2-Clause 38a36da99SPedro F. Giffuni * 48e0ad55aSJoel Dahl * Copyright (c) 2007, 2008 Kip Macy <kmacy@freebsd.org> 5db7f0b97SKip Macy * All rights reserved. 6db7f0b97SKip Macy * 7db7f0b97SKip Macy * Redistribution and use in source and binary forms, with or without 88e0ad55aSJoel Dahl * modification, are permitted provided that the following conditions 98e0ad55aSJoel Dahl * are met: 108e0ad55aSJoel Dahl * 1. Redistributions of source code must retain the above copyright 118e0ad55aSJoel Dahl * notice, this list of conditions and the following disclaimer. 128e0ad55aSJoel Dahl * 2. Redistributions in binary form must reproduce the above copyright 138e0ad55aSJoel Dahl * notice, this list of conditions and the following disclaimer in the 148e0ad55aSJoel Dahl * documentation and/or other materials provided with the distribution. 15db7f0b97SKip Macy * 168e0ad55aSJoel Dahl * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 178e0ad55aSJoel Dahl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18db7f0b97SKip Macy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 198e0ad55aSJoel Dahl * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 208e0ad55aSJoel Dahl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 218e0ad55aSJoel Dahl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 228e0ad55aSJoel Dahl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 238e0ad55aSJoel Dahl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 248e0ad55aSJoel Dahl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 258e0ad55aSJoel Dahl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 268e0ad55aSJoel Dahl * SUCH DAMAGE. 278e0ad55aSJoel Dahl */ 288e0ad55aSJoel Dahl 29db7f0b97SKip Macy #include <sys/cdefs.h> 30db7f0b97SKip Macy __FBSDID("$FreeBSD$"); 31db7f0b97SKip Macy 32db7f0b97SKip Macy #include <sys/param.h> 33db7f0b97SKip Macy #include <sys/systm.h> 34db7f0b97SKip Macy #include <sys/kernel.h> 35db7f0b97SKip Macy #include <sys/malloc.h> 36db7f0b97SKip Macy #include <sys/ktr.h> 37db7f0b97SKip Macy #include <sys/buf_ring.h> 38db7f0b97SKip Macy 39db7f0b97SKip Macy struct buf_ring * 40db7f0b97SKip Macy buf_ring_alloc(int count, struct malloc_type *type, int flags, struct mtx *lock) 41db7f0b97SKip Macy { 42db7f0b97SKip Macy struct buf_ring *br; 43db7f0b97SKip Macy 44db7f0b97SKip Macy KASSERT(powerof2(count), ("buf ring must be size power of 2")); 45db7f0b97SKip Macy 46db7f0b97SKip Macy br = malloc(sizeof(struct buf_ring) + count*sizeof(caddr_t), 47db7f0b97SKip Macy type, flags|M_ZERO); 48db7f0b97SKip Macy if (br == NULL) 49db7f0b97SKip Macy return (NULL); 50db7f0b97SKip Macy #ifdef DEBUG_BUFRING 51db7f0b97SKip Macy br->br_lock = lock; 52db7f0b97SKip Macy #endif 53db7f0b97SKip Macy br->br_prod_size = br->br_cons_size = count; 54db7f0b97SKip Macy br->br_prod_mask = br->br_cons_mask = count-1; 55db7f0b97SKip Macy br->br_prod_head = br->br_cons_head = 0; 56db7f0b97SKip Macy br->br_prod_tail = br->br_cons_tail = 0; 57db7f0b97SKip Macy 58db7f0b97SKip Macy return (br); 59db7f0b97SKip Macy } 60db7f0b97SKip Macy 61db7f0b97SKip Macy void 62db7f0b97SKip Macy buf_ring_free(struct buf_ring *br, struct malloc_type *type) 63db7f0b97SKip Macy { 64db7f0b97SKip Macy free(br, type); 65db7f0b97SKip Macy } 66