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92 lines
3 KiB
C
92 lines
3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _USB_MBUF_H_
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#define _USB_MBUF_H_
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/*
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* The following structure defines a minimum re-implementation of the
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* mbuf system in the kernel.
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*/
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struct usb_mbuf {
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uint8_t *cur_data_ptr;
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uint8_t *min_data_ptr;
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struct usb_mbuf *usb_nextpkt;
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struct usb_mbuf *usb_next;
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usb_size_t cur_data_len;
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usb_size_t max_data_len;
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uint8_t last_packet:1;
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uint8_t unused:7;
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};
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#define USB_IF_ENQUEUE(ifq, m) do { \
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(m)->usb_nextpkt = NULL; \
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if ((ifq)->ifq_tail == NULL) \
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(ifq)->ifq_head = (m); \
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else \
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(ifq)->ifq_tail->usb_nextpkt = (m); \
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(ifq)->ifq_tail = (m); \
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(ifq)->ifq_len++; \
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} while (0)
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#define USB_IF_DEQUEUE(ifq, m) do { \
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(m) = (ifq)->ifq_head; \
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if (m) { \
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if (((ifq)->ifq_head = (m)->usb_nextpkt) == NULL) { \
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(ifq)->ifq_tail = NULL; \
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} \
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(m)->usb_nextpkt = NULL; \
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(ifq)->ifq_len--; \
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} \
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} while (0)
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#define USB_IF_PREPEND(ifq, m) do { \
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(m)->usb_nextpkt = (ifq)->ifq_head; \
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if ((ifq)->ifq_tail == NULL) { \
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(ifq)->ifq_tail = (m); \
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} \
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(ifq)->ifq_head = (m); \
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(ifq)->ifq_len++; \
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} while (0)
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#define USB_IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
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#define USB_IF_QLEN(ifq) ((ifq)->ifq_len)
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#define USB_IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
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#define USB_MBUF_RESET(m) do { \
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(m)->cur_data_ptr = (m)->min_data_ptr; \
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(m)->cur_data_len = (m)->max_data_len; \
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(m)->last_packet = 0; \
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} while (0)
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/* prototypes */
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void *usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
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usb_size_t block_size, uint16_t nblocks);
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#endif /* _USB_MBUF_H_ */
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