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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/* -*- c++ -*- */
/*
* Copyright 2008 Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <usrp2_eth_packet.h>
#include <usrp2/usrp2.h>
#include <boost/scoped_ptr.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include "ethernet.h"
#include "pktfilter.h"
#include <string.h>
#include <iostream>
#include <stdexcept>
#define FIND_DEBUG 0
// FIXME move to gruel
static struct timeval
time_duration_to_timeval(boost::posix_time::time_duration delta)
{
long total_us = delta.total_microseconds();
if (total_us < 0)
throw std::invalid_argument("duration_to_time: delta is negative");
struct timeval tv;
tv.tv_sec = total_us / 1000000;
tv.tv_usec = total_us % 1000000;
return tv;
}
namespace usrp2 {
static props
reply_to_props(const op_id_reply_t *r)
{
const uint8_t *mac = (const uint8_t *)&r->addr;
char addr_buf[128];
snprintf(addr_buf, sizeof(addr_buf), "%02x:%02x:%02x:%02x:%02x:%02x",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
props p;
p.addr = std::string(addr_buf);
p.hw_rev = ntohs(r->hw_rev);
memcpy(p.fpga_md5sum, r->fpga_md5sum, sizeof(p.fpga_md5sum));
memcpy(p.sw_md5sum, r->sw_md5sum, sizeof(p.sw_md5sum));
return p;
}
static void
read_replies(ethernet *enet, struct timeval timeout,
const std::string &target_addr, props_vector_t &result)
{
struct reply {
u2_eth_packet_t h;
op_id_reply_t op_id_reply;
};
uint8_t pktbuf[ethernet::MAX_PKTLEN];
memset(pktbuf, 0, sizeof(pktbuf));
fd_set read_fds;
FD_ZERO(&read_fds);
FD_SET(enet->fd(), &read_fds);
select(enet->fd()+1, &read_fds, 0, 0, &timeout);
while(1) {
memset(pktbuf, 0, sizeof(pktbuf));
int len = enet->read_packet_dont_block(pktbuf, sizeof(pktbuf));
if (len < 0){
perror("usrp2_basic: read_packet_dont_block");
return;
}
if (len == 0)
break;
reply *rp = (reply *)pktbuf;
if (u2p_chan(&rp->h.fixed) != CONTROL_CHAN) // ignore
continue;
if (rp->op_id_reply.opcode != OP_ID_REPLY) // ignore
continue;
props p = reply_to_props(&rp->op_id_reply);
if (FIND_DEBUG)
std::cerr << "usrp2::find: response from " << p.addr << std::endl;
if ((target_addr == "") || (target_addr == p.addr))
result.push_back(p);
}
}
props_vector_t
find(const std::string &ifc, const std::string &addr)
{
if (FIND_DEBUG) {
std::cerr << "usrp2::find: Searching interface " << ifc << " for "
<< (addr == "" ? "all USRP2s" : addr)
<< std::endl;
}
props_vector_t result;
struct command {
u2_eth_packet_t h;
op_generic_t op_id;
};
std::auto_ptr<ethernet> enet(new ethernet());
if (!enet->open(ifc, htons(U2_ETHERTYPE)))
return result;
std::auto_ptr<pktfilter> pf(pktfilter::make_ethertype_inbound(U2_ETHERTYPE, enet->mac()));
if (!enet->attach_pktfilter(pf.get()))
return result;
static u2_mac_addr_t broadcast_mac_addr =
{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }};
uint8_t pktbuf[ethernet::MAX_PKTLEN];
memset(pktbuf, 0, sizeof(pktbuf));
command *c = (command *)pktbuf;
c->h.ehdr.ethertype = htons(U2_ETHERTYPE);
c->h.ehdr.dst = broadcast_mac_addr;
memcpy(&c->h.ehdr.src, enet->mac(), 6);
c->h.thdr.flags = 0;
c->h.thdr.seqno = 0;
c->h.thdr.ack = 0;
u2p_set_word0(&c->h.fixed, 0, CONTROL_CHAN);
u2p_set_timestamp(&c->h.fixed, -1);
c->op_id.opcode = OP_ID;
c->op_id.len = sizeof(c->op_id);
int len = std::max((size_t) ethernet::MIN_PKTLEN, sizeof(command));
if (enet->write_packet(c, len) != len)
return result;
if (FIND_DEBUG)
std::cerr << "usrp2::find: broadcast ID command" << std::endl;
/*
* Gather all responses that occur within 50ms
*/
boost::posix_time::ptime start(boost::posix_time::microsec_clock::universal_time());
boost::posix_time::ptime limit(start + boost::posix_time::milliseconds(50));
boost::posix_time::ptime now;
while (1){
now = boost::posix_time::microsec_clock::universal_time();
if (now >= limit)
break;
boost::posix_time::time_duration delta(limit - now);
struct timeval timeout = time_duration_to_timeval(delta);
read_replies(enet.get(), timeout, addr, result);
}
return result;
}
} // namespace usrp2
|
