usb_mbuf.h

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    1 /* $FreeBSD$ */
    2 /*-
    3  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    4  *
    5  * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #ifndef _USB_MBUF_H_
   30 #define _USB_MBUF_H_
   31 
   32 /*
   33  * The following structure defines a minimum re-implementation of the
   34  * mbuf system in the kernel.
   35  */
   36 struct usb_mbuf {
   37         uint8_t *cur_data_ptr;
   38         uint8_t *min_data_ptr;
   39         struct usb_mbuf *usb_nextpkt;
   40         struct usb_mbuf *usb_next;
   41 
   42         usb_size_t cur_data_len;
   43         usb_size_t max_data_len;
   44         uint8_t last_packet:1;
   45         uint8_t unused:7;
   46 };
   47 
   48 #define USB_IF_ENQUEUE(ifq, m) do {             \
   49     (m)->usb_nextpkt = NULL;                    \
   50     if ((ifq)->ifq_tail == NULL)                \
   51         (ifq)->ifq_head = (m);                  \
   52     else                                        \
   53         (ifq)->ifq_tail->usb_nextpkt = (m);     \
   54     (ifq)->ifq_tail = (m);                      \
   55     (ifq)->ifq_len++;                           \
   56   } while (0)
   57 
   58 #define USB_IF_DEQUEUE(ifq, m) do {                             \
   59     (m) = (ifq)->ifq_head;                                      \
   60     if (m) {                                                    \
   61         if (((ifq)->ifq_head = (m)->usb_nextpkt) == NULL) {     \
   62              (ifq)->ifq_tail = NULL;                            \
   63         }                                                       \
   64         (m)->usb_nextpkt = NULL;                                \
   65         (ifq)->ifq_len--;                                       \
   66     }                                                           \
   67   } while (0)
   68 
   69 #define USB_IF_PREPEND(ifq, m) do {             \
   70       (m)->usb_nextpkt = (ifq)->ifq_head;       \
   71       if ((ifq)->ifq_tail == NULL) {            \
   72           (ifq)->ifq_tail = (m);                \
   73       }                                         \
   74       (ifq)->ifq_head = (m);                    \
   75       (ifq)->ifq_len++;                         \
   76   } while (0)
   77 
   78 #define USB_IF_QFULL(ifq)   ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
   79 #define USB_IF_QLEN(ifq)    ((ifq)->ifq_len)
   80 #define USB_IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
   81 
   82 #define USB_MBUF_RESET(m) do {                  \
   83     (m)->cur_data_ptr = (m)->min_data_ptr;      \
   84     (m)->cur_data_len = (m)->max_data_len;      \
   85     (m)->last_packet = 0;                       \
   86   } while (0)
   87 
   88 /* prototypes */
   89 void   *usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
   90             usb_size_t block_size, uint16_t nblocks);
   91 
   92 #endif                                  /* _USB_MBUF_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/dev/usb/usb_mbuf.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/usb_mbuf.h