1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* Copyright (c) 1997, 1998, 1999, 2000
* Bill Paul <wpaul@ee.columbia.edu>. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
* 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.
*
* $FreeBSD$
*/
/*
* Callbacks in the USB code operate at splusb() (actually splbio()
* in FreeBSD). However adding packets to the input queues has to be
* done at splimp(). It is conceivable that this arrangement could
* trigger a condition where the splimp() is ignored and the input
* queues could get trampled in spite of our best effors to prevent
* it. To work around this, we implement a special input queue for
* USB ethernet adapter drivers. Rather than passing the frames directly
* to ether_input(), we pass them here, then schedule a soft interrupt
* to hand them to ether_input() later, outside of the USB interrupt
* context.
*
* It's questional as to whether this code should be expanded to
* handle other kinds of devices, or handle USB transfer callbacks
* in general. Right now, I need USB network interfaces to work
* properly.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/netisr.h>
#include <net/bpf.h>
#include <dev/usb/usb.h>
#include <dev/usb/usb_ethersubr.h>
#ifndef lint
Static const char rcsid[] =
"$FreeBSD$";
#endif
Static struct ifqueue usbq_rx;
Static struct ifqueue usbq_tx;
Static int mtx_inited = 0;
Static void usbintr (void);
Static void usbintr(void)
{
struct mbuf *m;
struct usb_qdat *q;
struct ifnet *ifp;
/* Check the RX queue */
while(1) {
IF_DEQUEUE(&usbq_rx, m);
if (m == NULL)
break;
q = (struct usb_qdat *)m->m_pkthdr.rcvif;
ifp = q->ifp;
m->m_pkthdr.rcvif = ifp;
(*ifp->if_input)(ifp, m);
/* Re-arm the receiver */
(*q->if_rxstart)(ifp);
if (ifp->if_snd.ifq_head != NULL)
(*ifp->if_start)(ifp);
}
/* Check the TX queue */
while(1) {
IF_DEQUEUE(&usbq_tx, m);
if (m == NULL)
break;
ifp = m->m_pkthdr.rcvif;
m_freem(m);
if (ifp->if_snd.ifq_head != NULL)
(*ifp->if_start)(ifp);
}
return;
}
void usb_register_netisr()
{
if (mtx_inited)
return;
netisr_register(NETISR_USB, (netisr_t *)usbintr, NULL);
mtx_init(&usbq_tx.ifq_mtx, "usbq_tx_mtx", NULL, MTX_DEF);
mtx_init(&usbq_rx.ifq_mtx, "usbq_rx_mtx", NULL, MTX_DEF);
mtx_inited++;
return;
}
/*
* Must be called at splusb() (actually splbio()). This should be
* the case when called from a transfer callback routine.
*/
void usb_ether_input(m)
struct mbuf *m;
{
IF_ENQUEUE(&usbq_rx, m);
schednetisr(NETISR_USB);
return;
}
void usb_tx_done(m)
struct mbuf *m;
{
IF_ENQUEUE(&usbq_tx, m);
schednetisr(NETISR_USB);
return;
}
|
