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/* $FreeBSD: release/9.1.0/sys/dev/usb/usb_mbuf.h 196219 2009-08-14 20:03:53Z jhb $ */
/*-
* Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _USB_MBUF_H_
#define _USB_MBUF_H_
/*
* The following structure defines a minimum re-implementation of the
* mbuf system in the kernel.
*/
struct usb_mbuf {
uint8_t *cur_data_ptr;
uint8_t *min_data_ptr;
struct usb_mbuf *usb_nextpkt;
struct usb_mbuf *usb_next;
usb_size_t cur_data_len;
usb_size_t max_data_len;
uint8_t last_packet:1;
uint8_t unused:7;
};
#define USB_IF_ENQUEUE(ifq, m) do { \
(m)->usb_nextpkt = NULL; \
if ((ifq)->ifq_tail == NULL) \
(ifq)->ifq_head = (m); \
else \
(ifq)->ifq_tail->usb_nextpkt = (m); \
(ifq)->ifq_tail = (m); \
(ifq)->ifq_len++; \
} while (0)
#define USB_IF_DEQUEUE(ifq, m) do { \
(m) = (ifq)->ifq_head; \
if (m) { \
if (((ifq)->ifq_head = (m)->usb_nextpkt) == NULL) { \
(ifq)->ifq_tail = NULL; \
} \
(m)->usb_nextpkt = NULL; \
(ifq)->ifq_len--; \
} \
} while (0)
#define USB_IF_PREPEND(ifq, m) do { \
(m)->usb_nextpkt = (ifq)->ifq_head; \
if ((ifq)->ifq_tail == NULL) { \
(ifq)->ifq_tail = (m); \
} \
(ifq)->ifq_head = (m); \
(ifq)->ifq_len++; \
} while (0)
#define USB_IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
#define USB_IF_QLEN(ifq) ((ifq)->ifq_len)
#define USB_IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
#define USB_MBUF_RESET(m) do { \
(m)->cur_data_ptr = (m)->min_data_ptr; \
(m)->cur_data_len = (m)->max_data_len; \
(m)->last_packet = 0; \
} while (0)
/* prototypes */
void *usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
usb_size_t block_size, uint16_t nblocks);
#endif /* _USB_MBUF_H_ */