target/arm: Implement VFP fp16 for VABS, VNEG, VSQRT
[qemu.git] / net / can / can_socketcan.c
1 /*
2 * CAN c support to connect to the Linux host SocketCAN interfaces
3 *
4 * Copyright (c) 2013-2014 Jin Yang
5 * Copyright (c) 2014-2018 Pavel Pisa
6 *
7 * Initial development supported by Google GSoC 2013 from RTEMS project slot
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a copy
10 * of this software and associated documentation files (the "Software"), to deal
11 * in the Software without restriction, including without limitation the rights
12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 * copies of the Software, and to permit persons to whom the Software is
14 * furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 * THE SOFTWARE.
26 */
27
28 #include "qemu/osdep.h"
29 #include "qemu/log.h"
30 #include "qemu/main-loop.h"
31 #include "qemu/module.h"
32 #include "qapi/error.h"
33 #include "chardev/char.h"
34 #include "qemu/sockets.h"
35 #include "qemu/error-report.h"
36 #include "net/can_emu.h"
37 #include "net/can_host.h"
38
39 #include <sys/ioctl.h>
40 #include <net/if.h>
41 #include <linux/can.h>
42 #include <linux/can/raw.h>
43
44 #ifndef DEBUG_CAN
45 #define DEBUG_CAN 0
46 #endif /*DEBUG_CAN*/
47
48 #define TYPE_CAN_HOST_SOCKETCAN "can-host-socketcan"
49 #define CAN_HOST_SOCKETCAN(obj) \
50 OBJECT_CHECK(CanHostSocketCAN, (obj), TYPE_CAN_HOST_SOCKETCAN)
51
52 #define CAN_READ_BUF_LEN 5
53 typedef struct CanHostSocketCAN {
54 CanHostState parent;
55 char *ifname;
56
57 qemu_can_filter *rfilter;
58 int rfilter_num;
59 can_err_mask_t err_mask;
60
61 qemu_can_frame buf[CAN_READ_BUF_LEN];
62 int bufcnt;
63 int bufptr;
64
65 int fd;
66 } CanHostSocketCAN;
67
68 /* Check that QEMU and Linux kernel flags encoding and structure matches */
69 QEMU_BUILD_BUG_ON(QEMU_CAN_EFF_FLAG != CAN_EFF_FLAG);
70 QEMU_BUILD_BUG_ON(QEMU_CAN_RTR_FLAG != CAN_RTR_FLAG);
71 QEMU_BUILD_BUG_ON(QEMU_CAN_ERR_FLAG != CAN_ERR_FLAG);
72 QEMU_BUILD_BUG_ON(QEMU_CAN_INV_FILTER != CAN_INV_FILTER);
73 QEMU_BUILD_BUG_ON(offsetof(qemu_can_frame, data)
74 != offsetof(struct can_frame, data));
75
76 static void can_host_socketcan_display_msg(struct qemu_can_frame *msg)
77 {
78 int i;
79 FILE *logfile = qemu_log_lock();
80 qemu_log("[cansocketcan]: %03X [%01d] %s %s",
81 msg->can_id & QEMU_CAN_EFF_MASK,
82 msg->can_dlc,
83 msg->can_id & QEMU_CAN_EFF_FLAG ? "EFF" : "SFF",
84 msg->can_id & QEMU_CAN_RTR_FLAG ? "RTR" : "DAT");
85
86 for (i = 0; i < msg->can_dlc; i++) {
87 qemu_log(" %02X", msg->data[i]);
88 }
89 qemu_log("\n");
90 qemu_log_flush();
91 qemu_log_unlock(logfile);
92 }
93
94 static void can_host_socketcan_read(void *opaque)
95 {
96 CanHostSocketCAN *c = opaque;
97 CanHostState *ch = CAN_HOST(c);
98
99 /* CAN_READ_BUF_LEN for multiple messages syscall is possible for future */
100 c->bufcnt = read(c->fd, c->buf, sizeof(qemu_can_frame));
101 if (c->bufcnt < 0) {
102 warn_report("CAN bus host read failed (%s)", strerror(errno));
103 return;
104 }
105
106 can_bus_client_send(&ch->bus_client, c->buf, 1);
107
108 if (DEBUG_CAN) {
109 can_host_socketcan_display_msg(c->buf);
110 }
111 }
112
113 static bool can_host_socketcan_can_receive(CanBusClientState *client)
114 {
115 return true;
116 }
117
118 static ssize_t can_host_socketcan_receive(CanBusClientState *client,
119 const qemu_can_frame *frames, size_t frames_cnt)
120 {
121 CanHostState *ch = container_of(client, CanHostState, bus_client);
122 CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(ch);
123
124 size_t len = sizeof(qemu_can_frame);
125 int res;
126
127 if (c->fd < 0) {
128 return -1;
129 }
130
131 res = write(c->fd, frames, len);
132
133 if (!res) {
134 warn_report("[cansocketcan]: write message to host returns zero");
135 return -1;
136 }
137
138 if (res != len) {
139 if (res < 0) {
140 warn_report("[cansocketcan]: write to host failed (%s)",
141 strerror(errno));
142 } else {
143 warn_report("[cansocketcan]: write to host truncated");
144 }
145 return -1;
146 }
147
148 return 1;
149 }
150
151 static void can_host_socketcan_disconnect(CanHostState *ch)
152 {
153 CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(ch);
154
155 if (c->fd >= 0) {
156 qemu_set_fd_handler(c->fd, NULL, NULL, c);
157 close(c->fd);
158 c->fd = -1;
159 }
160
161 g_free(c->rfilter);
162 c->rfilter = NULL;
163 c->rfilter_num = 0;
164 }
165
166 static CanBusClientInfo can_host_socketcan_bus_client_info = {
167 .can_receive = can_host_socketcan_can_receive,
168 .receive = can_host_socketcan_receive,
169 };
170
171 static void can_host_socketcan_connect(CanHostState *ch, Error **errp)
172 {
173 CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(ch);
174 int s; /* can raw socket */
175 struct sockaddr_can addr;
176 struct ifreq ifr;
177
178 /* open socket */
179 s = qemu_socket(PF_CAN, SOCK_RAW, CAN_RAW);
180 if (s < 0) {
181 error_setg_errno(errp, errno, "failed to create CAN_RAW socket");
182 return;
183 }
184
185 addr.can_family = AF_CAN;
186 memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name));
187 strcpy(ifr.ifr_name, c->ifname);
188 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
189 error_setg_errno(errp, errno,
190 "SocketCAN host interface %s not available", c->ifname);
191 goto fail;
192 }
193 addr.can_ifindex = ifr.ifr_ifindex;
194
195 c->err_mask = 0xffffffff; /* Receive error frame. */
196 setsockopt(s, SOL_CAN_RAW, CAN_RAW_ERR_FILTER,
197 &c->err_mask, sizeof(c->err_mask));
198
199 c->rfilter_num = 1;
200 c->rfilter = g_new(struct qemu_can_filter, c->rfilter_num);
201
202 /* Receive all data frame. If |= CAN_INV_FILTER no data. */
203 c->rfilter[0].can_id = 0;
204 c->rfilter[0].can_mask = 0;
205 c->rfilter[0].can_mask &= ~CAN_ERR_FLAG;
206
207 setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, c->rfilter,
208 c->rfilter_num * sizeof(struct qemu_can_filter));
209
210 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
211 error_setg_errno(errp, errno, "failed to bind to host interface %s",
212 c->ifname);
213 goto fail;
214 }
215
216 c->fd = s;
217 ch->bus_client.info = &can_host_socketcan_bus_client_info;
218 qemu_set_fd_handler(c->fd, can_host_socketcan_read, NULL, c);
219 return;
220
221 fail:
222 close(s);
223 g_free(c->rfilter);
224 c->rfilter = NULL;
225 c->rfilter_num = 0;
226 }
227
228 static char *can_host_socketcan_get_if(Object *obj, Error **errp)
229 {
230 CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(obj);
231
232 return g_strdup(c->ifname);
233 }
234
235 static void can_host_socketcan_set_if(Object *obj, const char *value, Error **errp)
236 {
237 CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(obj);
238 struct ifreq ifr;
239
240 if (strlen(value) >= sizeof(ifr.ifr_name)) {
241 error_setg(errp, "CAN interface name longer than %zd characters",
242 sizeof(ifr.ifr_name) - 1);
243 return;
244 }
245
246 if (c->fd != -1) {
247 error_setg(errp, "CAN interface already connected");
248 return;
249 }
250
251 g_free(c->ifname);
252 c->ifname = g_strdup(value);
253 }
254
255 static void can_host_socketcan_instance_init(Object *obj)
256 {
257 CanHostSocketCAN *c = CAN_HOST_SOCKETCAN(obj);
258
259 c->fd = -1;
260 }
261
262 static void can_host_socketcan_class_init(ObjectClass *klass,
263 void *class_data G_GNUC_UNUSED)
264 {
265 CanHostClass *chc = CAN_HOST_CLASS(klass);
266
267 object_class_property_add_str(klass, "if",
268 can_host_socketcan_get_if,
269 can_host_socketcan_set_if);
270 chc->connect = can_host_socketcan_connect;
271 chc->disconnect = can_host_socketcan_disconnect;
272 }
273
274 static const TypeInfo can_host_socketcan_info = {
275 .parent = TYPE_CAN_HOST,
276 .name = TYPE_CAN_HOST_SOCKETCAN,
277 .instance_size = sizeof(CanHostSocketCAN),
278 .instance_init = can_host_socketcan_instance_init,
279 .class_init = can_host_socketcan_class_init,
280 };
281
282 static void can_host_register_types(void)
283 {
284 type_register_static(&can_host_socketcan_info);
285 }
286
287 type_init(can_host_register_types);