1 /*
2  * qdev property parsing and global properties
3  * (parts specific for qemu-system-*)
4  *
5  * This file is based on code from hw/qdev-properties.c from
6  * commit 074a86fccd185616469dfcdc0e157f438aebba18,
7  * Copyright (c) Gerd Hoffmann <kraxel@redhat.com> and other contributors.
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
10  * See the COPYING file in the top-level directory.
11  */
12 
13 #include "net/net.h"
14 #include "hw/qdev.h"
15 #include "qapi/qmp/qerror.h"
16 #include "sysemu/blockdev.h"
17 #include "hw/block/block.h"
18 #include "net/hub.h"
19 #include "qapi/visitor.h"
20 #include "sysemu/char.h"
21 
22 static void get_pointer(Object *obj, Visitor *v, Property *prop,
23                         const char *(*print)(void *ptr),
24                         const char *name, Error **errp)
25 {
26     DeviceState *dev = DEVICE(obj);
27     void **ptr = qdev_get_prop_ptr(dev, prop);
28     char *p;
29 
30     p = (char *) (*ptr ? print(*ptr) : "");
31     visit_type_str(v, &p, name, errp);
32 }
33 
34 static void set_pointer(Object *obj, Visitor *v, Property *prop,
35                         int (*parse)(DeviceState *dev, const char *str,
36                                      void **ptr),
37                         const char *name, Error **errp)
38 {
39     DeviceState *dev = DEVICE(obj);
40     Error *local_err = NULL;
41     void **ptr = qdev_get_prop_ptr(dev, prop);
42     char *str;
43     int ret;
44 
45     if (dev->realized) {
46         qdev_prop_set_after_realize(dev, name, errp);
47         return;
48     }
49 
50     visit_type_str(v, &str, name, &local_err);
51     if (local_err) {
52         error_propagate(errp, local_err);
53         return;
54     }
55     if (!*str) {
56         g_free(str);
57         *ptr = NULL;
58         return;
59     }
60     ret = parse(dev, str, ptr);
61     error_set_from_qdev_prop_error(errp, ret, dev, prop, str);
62     g_free(str);
63 }
64 
65 /* --- drive --- */
66 
67 static int parse_drive(DeviceState *dev, const char *str, void **ptr)
68 {
69     BlockDriverState *bs;
70 
71     bs = bdrv_find(str);
72     if (bs == NULL) {
73         return -ENOENT;
74     }
75     if (bdrv_attach_dev(bs, dev) < 0) {
76         return -EEXIST;
77     }
78     *ptr = bs;
79     return 0;
80 }
81 
82 static void release_drive(Object *obj, const char *name, void *opaque)
83 {
84     DeviceState *dev = DEVICE(obj);
85     Property *prop = opaque;
86     BlockDriverState **ptr = qdev_get_prop_ptr(dev, prop);
87 
88     if (*ptr) {
89         bdrv_detach_dev(*ptr, dev);
90         blockdev_auto_del(*ptr);
91     }
92 }
93 
94 static const char *print_drive(void *ptr)
95 {
96     return bdrv_get_device_name(ptr);
97 }
98 
99 static void get_drive(Object *obj, Visitor *v, void *opaque,
100                       const char *name, Error **errp)
101 {
102     get_pointer(obj, v, opaque, print_drive, name, errp);
103 }
104 
105 static void set_drive(Object *obj, Visitor *v, void *opaque,
106                       const char *name, Error **errp)
107 {
108     set_pointer(obj, v, opaque, parse_drive, name, errp);
109 }
110 
111 PropertyInfo qdev_prop_drive = {
112     .name  = "drive",
113     .get   = get_drive,
114     .set   = set_drive,
115     .release = release_drive,
116 };
117 
118 /* --- character device --- */
119 
120 static int parse_chr(DeviceState *dev, const char *str, void **ptr)
121 {
122     CharDriverState *chr = qemu_chr_find(str);
123     if (chr == NULL) {
124         return -ENOENT;
125     }
126     if (qemu_chr_fe_claim(chr) != 0) {
127         return -EEXIST;
128     }
129     *ptr = chr;
130     return 0;
131 }
132 
133 static void release_chr(Object *obj, const char *name, void *opaque)
134 {
135     DeviceState *dev = DEVICE(obj);
136     Property *prop = opaque;
137     CharDriverState **ptr = qdev_get_prop_ptr(dev, prop);
138     CharDriverState *chr = *ptr;
139 
140     if (chr) {
141         qemu_chr_add_handlers(chr, NULL, NULL, NULL, NULL);
142         qemu_chr_fe_release(chr);
143     }
144 }
145 
146 
147 static const char *print_chr(void *ptr)
148 {
149     CharDriverState *chr = ptr;
150 
151     return chr->label ? chr->label : "";
152 }
153 
154 static void get_chr(Object *obj, Visitor *v, void *opaque,
155                     const char *name, Error **errp)
156 {
157     get_pointer(obj, v, opaque, print_chr, name, errp);
158 }
159 
160 static void set_chr(Object *obj, Visitor *v, void *opaque,
161                     const char *name, Error **errp)
162 {
163     set_pointer(obj, v, opaque, parse_chr, name, errp);
164 }
165 
166 PropertyInfo qdev_prop_chr = {
167     .name  = "chr",
168     .get   = get_chr,
169     .set   = set_chr,
170     .release = release_chr,
171 };
172 
173 /* --- netdev device --- */
174 
175 static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
176 {
177     NICPeers *peers_ptr = (NICPeers *)ptr;
178     NICConf *conf = container_of(peers_ptr, NICConf, peers);
179     NetClientState **ncs = peers_ptr->ncs;
180     NetClientState *peers[MAX_QUEUE_NUM];
181     int queues, i = 0;
182     int ret;
183 
184     queues = qemu_find_net_clients_except(str, peers,
185                                           NET_CLIENT_OPTIONS_KIND_NIC,
186                                           MAX_QUEUE_NUM);
187     if (queues == 0) {
188         ret = -ENOENT;
189         goto err;
190     }
191 
192     if (queues > MAX_QUEUE_NUM) {
193         ret = -E2BIG;
194         goto err;
195     }
196 
197     for (i = 0; i < queues; i++) {
198         if (peers[i] == NULL) {
199             ret = -ENOENT;
200             goto err;
201         }
202 
203         if (peers[i]->peer) {
204             ret = -EEXIST;
205             goto err;
206         }
207 
208         ncs[i] = peers[i];
209         ncs[i]->queue_index = i;
210     }
211 
212     conf->queues = queues;
213 
214     return 0;
215 
216 err:
217     return ret;
218 }
219 
220 static const char *print_netdev(void *ptr)
221 {
222     NetClientState *netdev = ptr;
223 
224     return netdev->name ? netdev->name : "";
225 }
226 
227 static void get_netdev(Object *obj, Visitor *v, void *opaque,
228                        const char *name, Error **errp)
229 {
230     get_pointer(obj, v, opaque, print_netdev, name, errp);
231 }
232 
233 static void set_netdev(Object *obj, Visitor *v, void *opaque,
234                        const char *name, Error **errp)
235 {
236     set_pointer(obj, v, opaque, parse_netdev, name, errp);
237 }
238 
239 PropertyInfo qdev_prop_netdev = {
240     .name  = "netdev",
241     .get   = get_netdev,
242     .set   = set_netdev,
243 };
244 
245 /* --- vlan --- */
246 
247 static int print_vlan(DeviceState *dev, Property *prop, char *dest, size_t len)
248 {
249     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
250 
251     if (*ptr) {
252         int id;
253         if (!net_hub_id_for_client(*ptr, &id)) {
254             return snprintf(dest, len, "%d", id);
255         }
256     }
257 
258     return snprintf(dest, len, "<null>");
259 }
260 
261 static void get_vlan(Object *obj, Visitor *v, void *opaque,
262                      const char *name, Error **errp)
263 {
264     DeviceState *dev = DEVICE(obj);
265     Property *prop = opaque;
266     NetClientState **ptr = qdev_get_prop_ptr(dev, prop);
267     int32_t id = -1;
268 
269     if (*ptr) {
270         int hub_id;
271         if (!net_hub_id_for_client(*ptr, &hub_id)) {
272             id = hub_id;
273         }
274     }
275 
276     visit_type_int32(v, &id, name, errp);
277 }
278 
279 static void set_vlan(Object *obj, Visitor *v, void *opaque,
280                      const char *name, Error **errp)
281 {
282     DeviceState *dev = DEVICE(obj);
283     Property *prop = opaque;
284     NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
285     NetClientState **ptr = &peers_ptr->ncs[0];
286     Error *local_err = NULL;
287     int32_t id;
288     NetClientState *hubport;
289 
290     if (dev->realized) {
291         qdev_prop_set_after_realize(dev, name, errp);
292         return;
293     }
294 
295     visit_type_int32(v, &id, name, &local_err);
296     if (local_err) {
297         error_propagate(errp, local_err);
298         return;
299     }
300     if (id == -1) {
301         *ptr = NULL;
302         return;
303     }
304 
305     hubport = net_hub_port_find(id);
306     if (!hubport) {
307         error_set(errp, QERR_INVALID_PARAMETER_VALUE,
308                   name, prop->info->name);
309         return;
310     }
311     *ptr = hubport;
312 }
313 
314 PropertyInfo qdev_prop_vlan = {
315     .name  = "vlan",
316     .print = print_vlan,
317     .get   = get_vlan,
318     .set   = set_vlan,
319 };
320 
321 int qdev_prop_set_drive(DeviceState *dev, const char *name,
322                         BlockDriverState *value)
323 {
324     Error *errp = NULL;
325     const char *bdrv_name = value ? bdrv_get_device_name(value) : "";
326     object_property_set_str(OBJECT(dev), bdrv_name,
327                             name, &errp);
328     if (errp) {
329         qerror_report_err(errp);
330         error_free(errp);
331         return -1;
332     }
333     return 0;
334 }
335 
336 void qdev_prop_set_drive_nofail(DeviceState *dev, const char *name,
337                                 BlockDriverState *value)
338 {
339     if (qdev_prop_set_drive(dev, name, value) < 0) {
340         exit(1);
341     }
342 }
343 void qdev_prop_set_chr(DeviceState *dev, const char *name,
344                        CharDriverState *value)
345 {
346     Error *errp = NULL;
347     assert(!value || value->label);
348     object_property_set_str(OBJECT(dev),
349                             value ? value->label : "", name, &errp);
350     assert_no_error(errp);
351 }
352 
353 void qdev_prop_set_netdev(DeviceState *dev, const char *name,
354                           NetClientState *value)
355 {
356     Error *errp = NULL;
357     assert(!value || value->name);
358     object_property_set_str(OBJECT(dev),
359                             value ? value->name : "", name, &errp);
360     assert_no_error(errp);
361 }
362 
363 void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
364 {
365     qdev_prop_set_macaddr(dev, "mac", nd->macaddr.a);
366     if (nd->netdev) {
367         qdev_prop_set_netdev(dev, "netdev", nd->netdev);
368     }
369     if (nd->nvectors != DEV_NVECTORS_UNSPECIFIED &&
370         object_property_find(OBJECT(dev), "vectors", NULL)) {
371         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
372     }
373     nd->instantiated = 1;
374 }
375 
376 static int qdev_add_one_global(QemuOpts *opts, void *opaque)
377 {
378     GlobalProperty *g;
379 
380     g = g_malloc0(sizeof(*g));
381     g->driver   = qemu_opt_get(opts, "driver");
382     g->property = qemu_opt_get(opts, "property");
383     g->value    = qemu_opt_get(opts, "value");
384     qdev_prop_register_global(g);
385     return 0;
386 }
387 
388 void qemu_add_globals(void)
389 {
390     qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL, 0);
391 }
392