usb_mbuf.h revision 193074
1184610Salfred/* $FreeBSD: head/sys/dev/usb/usb_mbuf.h 193074 2009-05-30 00:22:57Z thompsa $ */ 2184610Salfred/*- 3184610Salfred * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 4184610Salfred * 5184610Salfred * Redistribution and use in source and binary forms, with or without 6184610Salfred * modification, are permitted provided that the following conditions 7184610Salfred * are met: 8184610Salfred * 1. Redistributions of source code must retain the above copyright 9184610Salfred * notice, this list of conditions and the following disclaimer. 10184610Salfred * 2. Redistributions in binary form must reproduce the above copyright 11184610Salfred * notice, this list of conditions and the following disclaimer in the 12184610Salfred * documentation and/or other materials provided with the distribution. 13184610Salfred * 14184610Salfred * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15184610Salfred * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16184610Salfred * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17184610Salfred * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18184610Salfred * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19184610Salfred * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20184610Salfred * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21184610Salfred * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22184610Salfred * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23184610Salfred * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24184610Salfred * SUCH DAMAGE. 25184610Salfred */ 26184610Salfred 27184610Salfred#ifndef _USB2_MBUF_H_ 28184610Salfred#define _USB2_MBUF_H_ 29184610Salfred 30184610Salfred/* 31184610Salfred * The following structure defines a minimum re-implementation of the 32184610Salfred * mbuf system in the kernel. 33184610Salfred */ 34192984Sthompsastruct usb_mbuf { 35184610Salfred uint8_t *cur_data_ptr; 36184610Salfred uint8_t *min_data_ptr; 37192984Sthompsa struct usb_mbuf *usb2_nextpkt; 38192984Sthompsa struct usb_mbuf *usb2_next; 39184610Salfred 40193074Sthompsa usb_size_t cur_data_len; 41193074Sthompsa usb_size_t max_data_len; 42187183Sthompsa uint8_t last_packet:1; 43187183Sthompsa uint8_t unused:7; 44184610Salfred}; 45184610Salfred 46184610Salfred/* 47184610Salfred * The following structure defines a minimum re-implementation of the 48184610Salfred * ifqueue structure in the kernel. 49184610Salfred */ 50192984Sthompsastruct usb_ifqueue { 51192984Sthompsa struct usb_mbuf *ifq_head; 52192984Sthompsa struct usb_mbuf *ifq_tail; 53184610Salfred 54193074Sthompsa usb_size_t ifq_len; 55193074Sthompsa usb_size_t ifq_maxlen; 56184610Salfred}; 57184610Salfred 58184610Salfred#define USB_IF_ENQUEUE(ifq, m) do { \ 59184610Salfred (m)->usb2_nextpkt = NULL; \ 60184610Salfred if ((ifq)->ifq_tail == NULL) \ 61184610Salfred (ifq)->ifq_head = (m); \ 62184610Salfred else \ 63184610Salfred (ifq)->ifq_tail->usb2_nextpkt = (m); \ 64184610Salfred (ifq)->ifq_tail = (m); \ 65184610Salfred (ifq)->ifq_len++; \ 66184610Salfred } while (0) 67184610Salfred 68184610Salfred#define USB_IF_DEQUEUE(ifq, m) do { \ 69184610Salfred (m) = (ifq)->ifq_head; \ 70184610Salfred if (m) { \ 71184610Salfred if (((ifq)->ifq_head = (m)->usb2_nextpkt) == NULL) { \ 72184610Salfred (ifq)->ifq_tail = NULL; \ 73184610Salfred } \ 74184610Salfred (m)->usb2_nextpkt = NULL; \ 75184610Salfred (ifq)->ifq_len--; \ 76184610Salfred } \ 77184610Salfred } while (0) 78184610Salfred 79184610Salfred#define USB_IF_PREPEND(ifq, m) do { \ 80184610Salfred (m)->usb2_nextpkt = (ifq)->ifq_head; \ 81184610Salfred if ((ifq)->ifq_tail == NULL) { \ 82184610Salfred (ifq)->ifq_tail = (m); \ 83184610Salfred } \ 84184610Salfred (ifq)->ifq_head = (m); \ 85184610Salfred (ifq)->ifq_len++; \ 86184610Salfred } while (0) 87184610Salfred 88184610Salfred#define USB_IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 89184610Salfred#define USB_IF_QLEN(ifq) ((ifq)->ifq_len) 90184610Salfred#define USB_IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 91184610Salfred 92184610Salfred#define USB_MBUF_RESET(m) do { \ 93184610Salfred (m)->cur_data_ptr = (m)->min_data_ptr; \ 94184610Salfred (m)->cur_data_len = (m)->max_data_len; \ 95184610Salfred (m)->last_packet = 0; \ 96184610Salfred } while (0) 97184610Salfred 98184610Salfred/* prototypes */ 99192984Sthompsavoid *usb2_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq, 100193074Sthompsa usb_size_t block_size, uint16_t nblocks); 101184610Salfred 102184610Salfred#endif /* _USB2_MBUF_H_ */ 103