1219393Sadrian/* $FreeBSD: releng/11.0/sys/dev/usb/usb_mbuf.h 196219 2009-08-14 20:03:53Z jhb $ */ 2219393Sadrian/*- 3219393Sadrian * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 4219393Sadrian * 5219393Sadrian * Redistribution and use in source and binary forms, with or without 6219393Sadrian * modification, are permitted provided that the following conditions 7219393Sadrian * are met: 8219393Sadrian * 1. Redistributions of source code must retain the above copyright 9219393Sadrian * notice, this list of conditions and the following disclaimer. 10219393Sadrian * 2. Redistributions in binary form must reproduce the above copyright 11219393Sadrian * notice, this list of conditions and the following disclaimer in the 12219393Sadrian * documentation and/or other materials provided with the distribution. 13219393Sadrian * 14219393Sadrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15219393Sadrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16219393Sadrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17219393Sadrian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18219393Sadrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19219393Sadrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20219393Sadrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21219393Sadrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22219393Sadrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23219393Sadrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24219393Sadrian * SUCH DAMAGE. 25219393Sadrian */ 26219393Sadrian 27219393Sadrian#ifndef _USB_MBUF_H_ 28219393Sadrian#define _USB_MBUF_H_ 29219393Sadrian 30219393Sadrian/* 31219393Sadrian * The following structure defines a minimum re-implementation of the 32219393Sadrian * mbuf system in the kernel. 33219393Sadrian */ 34219393Sadrianstruct usb_mbuf { 35219393Sadrian uint8_t *cur_data_ptr; 36219393Sadrian uint8_t *min_data_ptr; 37219393Sadrian struct usb_mbuf *usb_nextpkt; 38219393Sadrian struct usb_mbuf *usb_next; 39219393Sadrian 40219393Sadrian usb_size_t cur_data_len; 41219393Sadrian usb_size_t max_data_len; 42219393Sadrian uint8_t last_packet:1; 43219393Sadrian uint8_t unused:7; 44219393Sadrian}; 45219393Sadrian 46219393Sadrian#define USB_IF_ENQUEUE(ifq, m) do { \ 47219393Sadrian (m)->usb_nextpkt = NULL; \ 48219393Sadrian if ((ifq)->ifq_tail == NULL) \ 49219393Sadrian (ifq)->ifq_head = (m); \ 50219393Sadrian else \ 51219393Sadrian (ifq)->ifq_tail->usb_nextpkt = (m); \ 52219393Sadrian (ifq)->ifq_tail = (m); \ 53219393Sadrian (ifq)->ifq_len++; \ 54219393Sadrian } while (0) 55219393Sadrian 56219393Sadrian#define USB_IF_DEQUEUE(ifq, m) do { \ 57219393Sadrian (m) = (ifq)->ifq_head; \ 58219393Sadrian if (m) { \ 59219393Sadrian if (((ifq)->ifq_head = (m)->usb_nextpkt) == NULL) { \ 60219393Sadrian (ifq)->ifq_tail = NULL; \ 61219393Sadrian } \ 62219393Sadrian (m)->usb_nextpkt = NULL; \ 63219393Sadrian (ifq)->ifq_len--; \ 64219393Sadrian } \ 65219393Sadrian } while (0) 66219393Sadrian 67219393Sadrian#define USB_IF_PREPEND(ifq, m) do { \ 68219393Sadrian (m)->usb_nextpkt = (ifq)->ifq_head; \ 69219393Sadrian if ((ifq)->ifq_tail == NULL) { \ 70219586Sadrian (ifq)->ifq_tail = (m); \ 71219393Sadrian } \ 72219393Sadrian (ifq)->ifq_head = (m); \ 73219393Sadrian (ifq)->ifq_len++; \ 74219393Sadrian } while (0) 75219393Sadrian 76219393Sadrian#define USB_IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 77219393Sadrian#define USB_IF_QLEN(ifq) ((ifq)->ifq_len) 78219393Sadrian#define USB_IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 79219393Sadrian 80219393Sadrian#define USB_MBUF_RESET(m) do { \ 81219393Sadrian (m)->cur_data_ptr = (m)->min_data_ptr; \ 82219393Sadrian (m)->cur_data_len = (m)->max_data_len; \ 83219393Sadrian (m)->last_packet = 0; \ 84219393Sadrian } while (0) 85219393Sadrian 86219393Sadrian/* prototypes */ 87219393Sadrianvoid *usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq, 88219393Sadrian usb_size_t block_size, uint16_t nblocks); 89219393Sadrian 90219393Sadrian#endif /* _USB_MBUF_H_ */ 91219393Sadrian