sys/bus/usb/usb_ethersubr.c

   1 /*
   2  * Copyright (c) 1997, 1998, 1999, 2000
   3  *      Bill Paul <wpaul@ee.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  30  * THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  *
  33  * $FreeBSD: src/sys/dev/usb/usb_ethersubr.c,v 1.17 2003/11/14 11:09:45 johan Exp $
  34  * $DragonFly: src/sys/bus/usb/usb_ethersubr.c,v 1.18 2007/05/23 08:57:10 dillon Exp $
  35  */
  36
  37 /*
  38  * Callbacks in the USB code operate in a critical section.
  39  *
  40  * It is conceivable that this arrangement could trigger a condition
  41  * where the input queues could get trampled in spite of our best effors
  42  * to prevent it. To work around this, we implement a special input queue
  43  * for USB ethernet adapter drivers. Rather than passing the frames directly
  44  * to ether_input(), we pass them here, then schedule a soft interrupt to
  45  * hand them to ether_input() later, outside of the USB interrupt context.
  46  *
  47  * It's questional as to whether this code should be expanded to
  48  * handle other kinds of devices, or handle USB transfer callbacks
  49  * in general. Right now, I need USB network interfaces to work
  50  * properly.
  51  */
  52
  53 #include <sys/param.h>
  54 #include <sys/systm.h>
  55 #include <sys/sockio.h>
  56 #include <sys/mbuf.h>
  57 #include <sys/malloc.h>
  58 #include <sys/socket.h>
  59
  60 #include <sys/thread2.h>
  61 #include <sys/msgport2.h>
  62
  63 #include <net/if.h>
  64 #include <net/ifq_var.h>
  65 #include <net/if_types.h>
  66 #include <net/if_arp.h>
  67 #include <net/ethernet.h>
  68 #include <net/netisr.h>
  69 #include <net/bpf.h>
  70
  71 #include "usb.h"
  72 #include "usb_ethersubr.h"
  73
  74 Static int netisr_inited = 0;
  75
  76 Static void
  77 usbintr(struct netmsg *msg)
  78 {
  79         struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
  80         struct ifnet *ifp;
  81
  82         ifp = m->m_pkthdr.rcvif;
  83         lwkt_serialize_enter(ifp->if_serializer);
  84         (*ifp->if_input)(ifp, m);
  85         lwkt_serialize_exit(ifp->if_serializer);
  86         /* the msg is embedded in the mbuf, do not reply it */
  87 }
  88
  89 void
  90 usb_register_netisr(void)
  91 {
  92         if (netisr_inited == 0) {
  93                 netisr_inited = 1;
  94                 netisr_register(NETISR_USB, cpu0_portfn, usbintr);
  95         }
  96 }
  97
  98 /*
  99  * Must be called from a critical section.  This should be the case when
 100  * called from a transfer callback routine.  Don't trust it, though.
 101  */
 102 void
 103 usb_ether_input(struct mbuf *m)
 104 {
 105         crit_enter();
 106         netisr_queue(NETISR_USB, m);
 107         crit_exit();
 108 }