1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 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 28 #ifndef _USB_MBUF_H_ 29 #define _USB_MBUF_H_ 30 31 /* 32 * The following structure defines a minimum re-implementation of the 33 * mbuf system in the kernel. 34 */ 35 struct usb_mbuf { 36 uint8_t *cur_data_ptr; 37 uint8_t *min_data_ptr; 38 struct usb_mbuf *usb_nextpkt; 39 struct usb_mbuf *usb_next; 40 41 usb_size_t cur_data_len; 42 usb_size_t max_data_len; 43 uint8_t last_packet:1; 44 uint8_t unused:7; 45 }; 46 47 #define USB_IF_ENQUEUE(ifq, m) do { \ 48 (m)->usb_nextpkt = NULL; \ 49 if ((ifq)->ifq_tail == NULL) \ 50 (ifq)->ifq_head = (m); \ 51 else \ 52 (ifq)->ifq_tail->usb_nextpkt = (m); \ 53 (ifq)->ifq_tail = (m); \ 54 (ifq)->ifq_len++; \ 55 } while (0) 56 57 #define USB_IF_DEQUEUE(ifq, m) do { \ 58 (m) = (ifq)->ifq_head; \ 59 if (m) { \ 60 if (((ifq)->ifq_head = (m)->usb_nextpkt) == NULL) { \ 61 (ifq)->ifq_tail = NULL; \ 62 } \ 63 (m)->usb_nextpkt = NULL; \ 64 (ifq)->ifq_len--; \ 65 } \ 66 } while (0) 67 68 #define USB_IF_PREPEND(ifq, m) do { \ 69 (m)->usb_nextpkt = (ifq)->ifq_head; \ 70 if ((ifq)->ifq_tail == NULL) { \ 71 (ifq)->ifq_tail = (m); \ 72 } \ 73 (ifq)->ifq_head = (m); \ 74 (ifq)->ifq_len++; \ 75 } while (0) 76 77 #define USB_IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 78 #define USB_IF_QLEN(ifq) ((ifq)->ifq_len) 79 #define USB_IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 80 81 #define USB_MBUF_RESET(m) do { \ 82 (m)->cur_data_ptr = (m)->min_data_ptr; \ 83 (m)->cur_data_len = (m)->max_data_len; \ 84 (m)->last_packet = 0; \ 85 } while (0) 86 87 /* prototypes */ 88 void *usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq, 89 usb_size_t block_size, uint16_t nblocks); 90 91 #endif /* _USB_MBUF_H_ */ 92