2 * Copyright (c) 1997, 1998, 1999, 2000
3 * Bill Paul <wpaul@ee.columbia.edu>. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
32 * $FreeBSD: src/sys/dev/usb/usb_ethersubr.c,v 1.4.2.4 2002/11/06 14:23:20 joe Exp $
36 * Callbacks in the USB code operate at splusb() (actually splbio()
37 * in FreeBSD). However adding packets to the input queues has to be
38 * done at splimp(). It is conceivable that this arrangement could
39 * trigger a condition where the splimp() is ignored and the input
40 * queues could get trampled in spite of our best effors to prevent
41 * it. To work around this, we implement a special input queue for
42 * USB ethernet adapter drivers. Rather than passing the frames directly
43 * to ether_input(), we pass them here, then schedule a soft interrupt
44 * to hand them to ether_input() later, outside of the USB interrupt
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
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/sockio.h>
57 #include <sys/malloc.h>
58 #include <sys/socket.h>
61 #include <net/if_types.h>
62 #include <net/if_arp.h>
63 #include <net/ethernet.h>
64 #include <net/netisr.h>
67 #include <dev/usb/usb.h>
68 #include <dev/usb/usb_ethersubr.h>
71 static const char rcsid[] =
72 "$FreeBSD: src/sys/dev/usb/usb_ethersubr.c,v 1.4.2.4 2002/11/06 14:23:20 joe Exp $";
75 Static struct ifqueue usbq_rx;
76 Static struct ifqueue usbq_tx;
78 Static void usbintr (void);
82 struct ether_header *eh;
90 /* Check the RX queue */
92 IF_DEQUEUE(&usbq_rx, m);
95 eh = mtod(m, struct ether_header *);
96 q = (struct usb_qdat *)m->m_pkthdr.rcvif;
98 m->m_pkthdr.rcvif = ifp;
99 m_adj(m, sizeof(struct ether_header));
100 ether_input(ifp, eh, m);
102 /* Re-arm the receiver */
103 (*q->if_rxstart)(ifp);
104 if (ifp->if_snd.ifq_head != NULL)
105 (*ifp->if_start)(ifp);
108 /* Check the TX queue */
110 IF_DEQUEUE(&usbq_tx, m);
113 ifp = m->m_pkthdr.rcvif;
115 if (ifp->if_snd.ifq_head != NULL)
116 (*ifp->if_start)(ifp);
124 void usb_register_netisr()
126 register_netisr(NETISR_USB, usbintr);
131 * Must be called at splusp() (actually splbio()). This should be
132 * the case when called from a transfer callback routine.
134 void usb_ether_input(m)
139 IF_ENQUEUE(&usbq_rx, m);
140 schednetisr(NETISR_USB);
150 IF_ENQUEUE(&usbq_tx, m);
151 schednetisr(NETISR_USB);