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1 | /* | |
2 | * xen paravirt network card backend | |
3 | * | |
4 | * (c) Gerd Hoffmann <kraxel@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; under version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, see <http://www.gnu.org/licenses/>. | |
17 | * | |
18 | * Contributions after 2012-01-13 are licensed under the terms of the | |
19 | * GNU GPL, version 2 or (at your option) any later version. | |
20 | */ | |
21 | ||
22 | #include "qemu/osdep.h" | |
23 | #include "qemu/main-loop.h" | |
24 | #include "qemu/cutils.h" | |
25 | #include "qemu/log.h" | |
26 | #include "qemu/qemu-print.h" | |
27 | #include "qapi/qmp/qdict.h" | |
28 | #include "qapi/error.h" | |
29 | ||
30 | #include <sys/socket.h> | |
31 | #include <sys/ioctl.h> | |
32 | #include <sys/wait.h> | |
33 | ||
34 | #include "net/net.h" | |
35 | #include "net/checksum.h" | |
36 | #include "net/util.h" | |
37 | ||
38 | #include "hw/xen/xen-backend.h" | |
39 | #include "hw/xen/xen-bus-helper.h" | |
40 | #include "hw/qdev-properties.h" | |
41 | #include "hw/qdev-properties-system.h" | |
42 | ||
43 | #include "hw/xen/interface/io/netif.h" | |
44 | #include "hw/xen/interface/io/xs_wire.h" | |
45 | ||
46 | #include "trace.h" | |
47 | ||
48 | /* ------------------------------------------------------------- */ | |
49 | ||
50 | struct XenNetDev { | |
51 | struct XenDevice xendev; /* must be first */ | |
52 | XenEventChannel *event_channel; | |
53 | int dev; | |
54 | int tx_work; | |
55 | unsigned int tx_ring_ref; | |
56 | unsigned int rx_ring_ref; | |
57 | struct netif_tx_sring *txs; | |
58 | struct netif_rx_sring *rxs; | |
59 | netif_tx_back_ring_t tx_ring; | |
60 | netif_rx_back_ring_t rx_ring; | |
61 | NICConf conf; | |
62 | NICState *nic; | |
63 | }; | |
64 | ||
65 | typedef struct XenNetDev XenNetDev; | |
66 | ||
67 | #define TYPE_XEN_NET_DEVICE "xen-net-device" | |
68 | OBJECT_DECLARE_SIMPLE_TYPE(XenNetDev, XEN_NET_DEVICE) | |
69 | ||
70 | /* ------------------------------------------------------------- */ | |
71 | ||
72 | static void net_tx_response(struct XenNetDev *netdev, netif_tx_request_t *txp, int8_t st) | |
73 | { | |
74 | RING_IDX i = netdev->tx_ring.rsp_prod_pvt; | |
75 | netif_tx_response_t *resp; | |
76 | int notify; | |
77 | ||
78 | resp = RING_GET_RESPONSE(&netdev->tx_ring, i); | |
79 | resp->id = txp->id; | |
80 | resp->status = st; | |
81 | ||
82 | #if 0 | |
83 | if (txp->flags & NETTXF_extra_info) { | |
84 | RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL; | |
85 | } | |
86 | #endif | |
87 | ||
88 | netdev->tx_ring.rsp_prod_pvt = ++i; | |
89 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify); | |
90 | if (notify) { | |
91 | xen_device_notify_event_channel(XEN_DEVICE(netdev), | |
92 | netdev->event_channel, NULL); | |
93 | } | |
94 | ||
95 | if (i == netdev->tx_ring.req_cons) { | |
96 | int more_to_do; | |
97 | RING_FINAL_CHECK_FOR_REQUESTS(&netdev->tx_ring, more_to_do); | |
98 | if (more_to_do) { | |
99 | netdev->tx_work++; | |
100 | } | |
101 | } | |
102 | } | |
103 | ||
104 | static void net_tx_error(struct XenNetDev *netdev, netif_tx_request_t *txp, RING_IDX end) | |
105 | { | |
106 | #if 0 | |
107 | /* | |
108 | * Hmm, why netback fails everything in the ring? | |
109 | * Should we do that even when not supporting SG and TSO? | |
110 | */ | |
111 | RING_IDX cons = netdev->tx_ring.req_cons; | |
112 | ||
113 | do { | |
114 | make_tx_response(netif, txp, NETIF_RSP_ERROR); | |
115 | if (cons >= end) { | |
116 | break; | |
117 | } | |
118 | txp = RING_GET_REQUEST(&netdev->tx_ring, cons++); | |
119 | } while (1); | |
120 | netdev->tx_ring.req_cons = cons; | |
121 | netif_schedule_work(netif); | |
122 | netif_put(netif); | |
123 | #else | |
124 | net_tx_response(netdev, txp, NETIF_RSP_ERROR); | |
125 | #endif | |
126 | } | |
127 | ||
128 | static bool net_tx_packets(struct XenNetDev *netdev) | |
129 | { | |
130 | bool done_something = false; | |
131 | netif_tx_request_t txreq; | |
132 | RING_IDX rc, rp; | |
133 | void *page; | |
134 | void *tmpbuf = NULL; | |
135 | ||
136 | assert(bql_locked()); | |
137 | ||
138 | for (;;) { | |
139 | rc = netdev->tx_ring.req_cons; | |
140 | rp = netdev->tx_ring.sring->req_prod; | |
141 | xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ | |
142 | ||
143 | while ((rc != rp)) { | |
144 | if (RING_REQUEST_CONS_OVERFLOW(&netdev->tx_ring, rc)) { | |
145 | break; | |
146 | } | |
147 | memcpy(&txreq, RING_GET_REQUEST(&netdev->tx_ring, rc), sizeof(txreq)); | |
148 | netdev->tx_ring.req_cons = ++rc; | |
149 | done_something = true; | |
150 | ||
151 | #if 1 | |
152 | /* should not happen in theory, we don't announce the * | |
153 | * feature-{sg,gso,whatelse} flags in xenstore (yet?) */ | |
154 | if (txreq.flags & NETTXF_extra_info) { | |
155 | qemu_log_mask(LOG_UNIMP, "vif%u: FIXME: extra info flag\n", | |
156 | netdev->dev); | |
157 | net_tx_error(netdev, &txreq, rc); | |
158 | continue; | |
159 | } | |
160 | if (txreq.flags & NETTXF_more_data) { | |
161 | qemu_log_mask(LOG_UNIMP, "vif%u: FIXME: more data flag\n", | |
162 | netdev->dev); | |
163 | net_tx_error(netdev, &txreq, rc); | |
164 | continue; | |
165 | } | |
166 | #endif | |
167 | ||
168 | if (txreq.size < 14) { | |
169 | qemu_log_mask(LOG_GUEST_ERROR, "vif%u: bad packet size: %d\n", | |
170 | netdev->dev, txreq.size); | |
171 | net_tx_error(netdev, &txreq, rc); | |
172 | continue; | |
173 | } | |
174 | ||
175 | if ((txreq.offset + txreq.size) > XEN_PAGE_SIZE) { | |
176 | qemu_log_mask(LOG_GUEST_ERROR, "vif%u: error: page crossing\n", | |
177 | netdev->dev); | |
178 | net_tx_error(netdev, &txreq, rc); | |
179 | continue; | |
180 | } | |
181 | ||
182 | trace_xen_netdev_tx(netdev->dev, txreq.gref, txreq.offset, | |
183 | txreq.size, txreq.flags, | |
184 | (txreq.flags & NETTXF_csum_blank) ? " csum_blank" : "", | |
185 | (txreq.flags & NETTXF_data_validated) ? " data_validated" : "", | |
186 | (txreq.flags & NETTXF_more_data) ? " more_data" : "", | |
187 | (txreq.flags & NETTXF_extra_info) ? " extra_info" : ""); | |
188 | ||
189 | page = xen_device_map_grant_refs(&netdev->xendev, &txreq.gref, 1, | |
190 | PROT_READ, NULL); | |
191 | if (page == NULL) { | |
192 | qemu_log_mask(LOG_GUEST_ERROR, | |
193 | "vif%u: tx gref dereference failed (%d)\n", | |
194 | netdev->dev, txreq.gref); | |
195 | net_tx_error(netdev, &txreq, rc); | |
196 | continue; | |
197 | } | |
198 | if (txreq.flags & NETTXF_csum_blank) { | |
199 | /* have read-only mapping -> can't fill checksum in-place */ | |
200 | if (!tmpbuf) { | |
201 | tmpbuf = g_malloc(XEN_PAGE_SIZE); | |
202 | } | |
203 | memcpy(tmpbuf, page + txreq.offset, txreq.size); | |
204 | net_checksum_calculate(tmpbuf, txreq.size, CSUM_ALL); | |
205 | qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf, | |
206 | txreq.size); | |
207 | } else { | |
208 | qemu_send_packet(qemu_get_queue(netdev->nic), | |
209 | page + txreq.offset, txreq.size); | |
210 | } | |
211 | xen_device_unmap_grant_refs(&netdev->xendev, page, &txreq.gref, 1, | |
212 | NULL); | |
213 | net_tx_response(netdev, &txreq, NETIF_RSP_OKAY); | |
214 | } | |
215 | if (!netdev->tx_work) { | |
216 | break; | |
217 | } | |
218 | netdev->tx_work = 0; | |
219 | } | |
220 | g_free(tmpbuf); | |
221 | return done_something; | |
222 | } | |
223 | ||
224 | /* ------------------------------------------------------------- */ | |
225 | ||
226 | static void net_rx_response(struct XenNetDev *netdev, | |
227 | netif_rx_request_t *req, int8_t st, | |
228 | uint16_t offset, uint16_t size, | |
229 | uint16_t flags) | |
230 | { | |
231 | RING_IDX i = netdev->rx_ring.rsp_prod_pvt; | |
232 | netif_rx_response_t *resp; | |
233 | int notify; | |
234 | ||
235 | resp = RING_GET_RESPONSE(&netdev->rx_ring, i); | |
236 | resp->offset = offset; | |
237 | resp->flags = flags; | |
238 | resp->id = req->id; | |
239 | resp->status = (int16_t)size; | |
240 | if (st < 0) { | |
241 | resp->status = (int16_t)st; | |
242 | } | |
243 | ||
244 | trace_xen_netdev_rx(netdev->dev, i, resp->status, resp->flags); | |
245 | ||
246 | netdev->rx_ring.rsp_prod_pvt = ++i; | |
247 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify); | |
248 | if (notify) { | |
249 | xen_device_notify_event_channel(XEN_DEVICE(netdev), | |
250 | netdev->event_channel, NULL); | |
251 | } | |
252 | } | |
253 | ||
254 | #define NET_IP_ALIGN 2 | |
255 | ||
256 | static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size) | |
257 | { | |
258 | struct XenNetDev *netdev = qemu_get_nic_opaque(nc); | |
259 | netif_rx_request_t rxreq; | |
260 | RING_IDX rc, rp; | |
261 | void *page; | |
262 | ||
263 | assert(bql_locked()); | |
264 | ||
265 | if (xen_device_backend_get_state(&netdev->xendev) != XenbusStateConnected) { | |
266 | return -1; | |
267 | } | |
268 | ||
269 | rc = netdev->rx_ring.req_cons; | |
270 | rp = netdev->rx_ring.sring->req_prod; | |
271 | xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ | |
272 | ||
273 | if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) { | |
274 | return 0; | |
275 | } | |
276 | if (size > XEN_PAGE_SIZE - NET_IP_ALIGN) { | |
277 | qemu_log_mask(LOG_GUEST_ERROR, "vif%u: packet too big (%lu > %ld)", | |
278 | netdev->dev, (unsigned long)size, | |
279 | XEN_PAGE_SIZE - NET_IP_ALIGN); | |
280 | return -1; | |
281 | } | |
282 | ||
283 | memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq)); | |
284 | netdev->rx_ring.req_cons = ++rc; | |
285 | ||
286 | page = xen_device_map_grant_refs(&netdev->xendev, &rxreq.gref, 1, | |
287 | PROT_WRITE, NULL); | |
288 | if (page == NULL) { | |
289 | qemu_log_mask(LOG_GUEST_ERROR, | |
290 | "vif%u: rx gref dereference failed (%d)\n", | |
291 | netdev->dev, rxreq.gref); | |
292 | net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0); | |
293 | return -1; | |
294 | } | |
295 | memcpy(page + NET_IP_ALIGN, buf, size); | |
296 | xen_device_unmap_grant_refs(&netdev->xendev, page, &rxreq.gref, 1, NULL); | |
297 | net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0); | |
298 | ||
299 | return size; | |
300 | } | |
301 | ||
302 | /* ------------------------------------------------------------- */ | |
303 | ||
304 | static NetClientInfo net_xen_info = { | |
305 | .type = NET_CLIENT_DRIVER_NIC, | |
306 | .size = sizeof(NICState), | |
307 | .receive = net_rx_packet, | |
308 | }; | |
309 | ||
310 | static void xen_netdev_realize(XenDevice *xendev, Error **errp) | |
311 | { | |
312 | ERRP_GUARD(); | |
313 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
314 | NetClientState *nc; | |
315 | ||
316 | qemu_macaddr_default_if_unset(&netdev->conf.macaddr); | |
317 | ||
318 | xen_device_frontend_printf(xendev, "mac", "%02x:%02x:%02x:%02x:%02x:%02x", | |
319 | netdev->conf.macaddr.a[0], | |
320 | netdev->conf.macaddr.a[1], | |
321 | netdev->conf.macaddr.a[2], | |
322 | netdev->conf.macaddr.a[3], | |
323 | netdev->conf.macaddr.a[4], | |
324 | netdev->conf.macaddr.a[5]); | |
325 | ||
326 | netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf, | |
327 | object_get_typename(OBJECT(xendev)), | |
328 | DEVICE(xendev)->id, | |
329 | &xendev->qdev.mem_reentrancy_guard, netdev); | |
330 | ||
331 | nc = qemu_get_queue(netdev->nic); | |
332 | qemu_format_nic_info_str(nc, netdev->conf.macaddr.a); | |
333 | ||
334 | /* fill info */ | |
335 | xen_device_backend_printf(xendev, "feature-rx-copy", "%u", 1); | |
336 | xen_device_backend_printf(xendev, "feature-rx-flip", "%u", 0); | |
337 | ||
338 | trace_xen_netdev_realize(netdev->dev, nc->info_str, nc->peer ? | |
339 | nc->peer->name : "(none)"); | |
340 | } | |
341 | ||
342 | static bool net_event(void *_xendev) | |
343 | { | |
344 | XenNetDev *netdev = XEN_NET_DEVICE(_xendev); | |
345 | bool done_something; | |
346 | ||
347 | done_something = net_tx_packets(netdev); | |
348 | qemu_flush_queued_packets(qemu_get_queue(netdev->nic)); | |
349 | return done_something; | |
350 | } | |
351 | ||
352 | static bool xen_netdev_connect(XenDevice *xendev, Error **errp) | |
353 | { | |
354 | ERRP_GUARD(); | |
355 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
356 | unsigned int port, rx_copy; | |
357 | ||
358 | assert(bql_locked()); | |
359 | ||
360 | if (xen_device_frontend_scanf(xendev, "tx-ring-ref", "%u", | |
361 | &netdev->tx_ring_ref) != 1) { | |
362 | error_setg(errp, "failed to read tx-ring-ref"); | |
363 | return false; | |
364 | } | |
365 | ||
366 | if (xen_device_frontend_scanf(xendev, "rx-ring-ref", "%u", | |
367 | &netdev->rx_ring_ref) != 1) { | |
368 | error_setg(errp, "failed to read rx-ring-ref"); | |
369 | return false; | |
370 | } | |
371 | ||
372 | if (xen_device_frontend_scanf(xendev, "event-channel", "%u", | |
373 | &port) != 1) { | |
374 | error_setg(errp, "failed to read event-channel"); | |
375 | return false; | |
376 | } | |
377 | ||
378 | if (xen_device_frontend_scanf(xendev, "request-rx-copy", "%u", | |
379 | &rx_copy) != 1) { | |
380 | rx_copy = 0; | |
381 | } | |
382 | if (rx_copy == 0) { | |
383 | error_setg(errp, "frontend doesn't support rx-copy"); | |
384 | return false; | |
385 | } | |
386 | ||
387 | netdev->txs = xen_device_map_grant_refs(xendev, | |
388 | &netdev->tx_ring_ref, 1, | |
389 | PROT_READ | PROT_WRITE, | |
390 | errp); | |
391 | if (!netdev->txs) { | |
392 | error_prepend(errp, "failed to map tx grant ref: "); | |
393 | return false; | |
394 | } | |
395 | ||
396 | netdev->rxs = xen_device_map_grant_refs(xendev, | |
397 | &netdev->rx_ring_ref, 1, | |
398 | PROT_READ | PROT_WRITE, | |
399 | errp); | |
400 | if (!netdev->rxs) { | |
401 | error_prepend(errp, "failed to map rx grant ref: "); | |
402 | return false; | |
403 | } | |
404 | ||
405 | BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XEN_PAGE_SIZE); | |
406 | BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XEN_PAGE_SIZE); | |
407 | ||
408 | netdev->event_channel = xen_device_bind_event_channel(xendev, port, | |
409 | net_event, | |
410 | netdev, | |
411 | errp); | |
412 | if (!netdev->event_channel) { | |
413 | return false; | |
414 | } | |
415 | ||
416 | trace_xen_netdev_connect(netdev->dev, netdev->tx_ring_ref, | |
417 | netdev->rx_ring_ref, port); | |
418 | ||
419 | net_tx_packets(netdev); | |
420 | return true; | |
421 | } | |
422 | ||
423 | static void xen_netdev_disconnect(XenDevice *xendev, Error **errp) | |
424 | { | |
425 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
426 | ||
427 | trace_xen_netdev_disconnect(netdev->dev); | |
428 | ||
429 | assert(bql_locked()); | |
430 | ||
431 | netdev->tx_ring.sring = NULL; | |
432 | netdev->rx_ring.sring = NULL; | |
433 | ||
434 | if (netdev->event_channel) { | |
435 | xen_device_unbind_event_channel(xendev, netdev->event_channel, | |
436 | errp); | |
437 | netdev->event_channel = NULL; | |
438 | } | |
439 | if (netdev->txs) { | |
440 | xen_device_unmap_grant_refs(xendev, netdev->txs, | |
441 | &netdev->tx_ring_ref, 1, errp); | |
442 | netdev->txs = NULL; | |
443 | } | |
444 | if (netdev->rxs) { | |
445 | xen_device_unmap_grant_refs(xendev, netdev->rxs, | |
446 | &netdev->rx_ring_ref, 1, errp); | |
447 | netdev->rxs = NULL; | |
448 | } | |
449 | } | |
450 | ||
451 | /* -------------------------------------------------------------------- */ | |
452 | ||
453 | ||
454 | static void xen_netdev_frontend_changed(XenDevice *xendev, | |
455 | enum xenbus_state frontend_state, | |
456 | Error **errp) | |
457 | { | |
458 | ERRP_GUARD(); | |
459 | enum xenbus_state backend_state = xen_device_backend_get_state(xendev); | |
460 | ||
461 | trace_xen_netdev_frontend_changed(xendev->name, frontend_state); | |
462 | ||
463 | switch (frontend_state) { | |
464 | case XenbusStateConnected: | |
465 | if (backend_state == XenbusStateConnected) { | |
466 | break; | |
467 | } | |
468 | ||
469 | xen_netdev_disconnect(xendev, errp); | |
470 | if (*errp) { | |
471 | break; | |
472 | } | |
473 | ||
474 | if (!xen_netdev_connect(xendev, errp)) { | |
475 | xen_netdev_disconnect(xendev, NULL); | |
476 | xen_device_backend_set_state(xendev, XenbusStateClosing); | |
477 | break; | |
478 | } | |
479 | ||
480 | xen_device_backend_set_state(xendev, XenbusStateConnected); | |
481 | break; | |
482 | ||
483 | case XenbusStateClosing: | |
484 | xen_device_backend_set_state(xendev, XenbusStateClosing); | |
485 | break; | |
486 | ||
487 | case XenbusStateClosed: | |
488 | case XenbusStateUnknown: | |
489 | xen_netdev_disconnect(xendev, errp); | |
490 | if (*errp) { | |
491 | break; | |
492 | } | |
493 | ||
494 | xen_device_backend_set_state(xendev, XenbusStateClosed); | |
495 | break; | |
496 | ||
497 | case XenbusStateInitialised: | |
498 | /* | |
499 | * Linux netback does nothing on the frontend going (back) to | |
500 | * XenbusStateInitialised, so do the same here. | |
501 | */ | |
502 | default: | |
503 | break; | |
504 | } | |
505 | } | |
506 | ||
507 | static char *xen_netdev_get_name(XenDevice *xendev, Error **errp) | |
508 | { | |
509 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
510 | ||
511 | if (netdev->dev == -1) { | |
512 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
513 | char fe_path[XENSTORE_ABS_PATH_MAX + 1]; | |
514 | int idx = (xen_mode == XEN_EMULATE) ? 0 : 1; | |
515 | char *value; | |
516 | ||
517 | /* Theoretically we could go up to INT_MAX here but that's overkill */ | |
518 | while (idx < 100) { | |
519 | snprintf(fe_path, sizeof(fe_path), | |
520 | "/local/domain/%u/device/vif/%u", | |
521 | xendev->frontend_id, idx); | |
522 | value = qemu_xen_xs_read(xenbus->xsh, XBT_NULL, fe_path, NULL); | |
523 | if (!value) { | |
524 | if (errno == ENOENT) { | |
525 | netdev->dev = idx; | |
526 | goto found; | |
527 | } | |
528 | error_setg(errp, "cannot read %s: %s", fe_path, | |
529 | strerror(errno)); | |
530 | return NULL; | |
531 | } | |
532 | free(value); | |
533 | idx++; | |
534 | } | |
535 | error_setg(errp, "cannot find device index for netdev device"); | |
536 | return NULL; | |
537 | } | |
538 | found: | |
539 | return g_strdup_printf("%u", netdev->dev); | |
540 | } | |
541 | ||
542 | static void xen_netdev_unrealize(XenDevice *xendev) | |
543 | { | |
544 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
545 | ||
546 | trace_xen_netdev_unrealize(netdev->dev); | |
547 | ||
548 | /* Disconnect from the frontend in case this has not already happened */ | |
549 | xen_netdev_disconnect(xendev, NULL); | |
550 | ||
551 | if (netdev->nic) { | |
552 | qemu_del_nic(netdev->nic); | |
553 | } | |
554 | } | |
555 | ||
556 | /* ------------------------------------------------------------- */ | |
557 | ||
558 | static Property xen_netdev_properties[] = { | |
559 | DEFINE_NIC_PROPERTIES(XenNetDev, conf), | |
560 | DEFINE_PROP_INT32("idx", XenNetDev, dev, -1), | |
561 | DEFINE_PROP_END_OF_LIST(), | |
562 | }; | |
563 | ||
564 | static void xen_netdev_class_init(ObjectClass *class, void *data) | |
565 | { | |
566 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
567 | XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); | |
568 | ||
569 | xendev_class->backend = "qnic"; | |
570 | xendev_class->device = "vif"; | |
571 | xendev_class->get_name = xen_netdev_get_name; | |
572 | xendev_class->realize = xen_netdev_realize; | |
573 | xendev_class->frontend_changed = xen_netdev_frontend_changed; | |
574 | xendev_class->unrealize = xen_netdev_unrealize; | |
575 | set_bit(DEVICE_CATEGORY_NETWORK, dev_class->categories); | |
576 | dev_class->user_creatable = true; | |
577 | ||
578 | device_class_set_props(dev_class, xen_netdev_properties); | |
579 | } | |
580 | ||
581 | static const TypeInfo xen_net_type_info = { | |
582 | .name = TYPE_XEN_NET_DEVICE, | |
583 | .parent = TYPE_XEN_DEVICE, | |
584 | .instance_size = sizeof(XenNetDev), | |
585 | .class_init = xen_netdev_class_init, | |
586 | }; | |
587 | ||
588 | static void xen_net_register_types(void) | |
589 | { | |
590 | type_register_static(&xen_net_type_info); | |
591 | } | |
592 | ||
593 | type_init(xen_net_register_types) | |
594 | ||
595 | /* Called to instantiate a XenNetDev when the backend is detected. */ | |
596 | static void xen_net_device_create(XenBackendInstance *backend, | |
597 | QDict *opts, Error **errp) | |
598 | { | |
599 | ERRP_GUARD(); | |
600 | XenBus *xenbus = xen_backend_get_bus(backend); | |
601 | const char *name = xen_backend_get_name(backend); | |
602 | XenDevice *xendev = NULL; | |
603 | unsigned long number; | |
604 | const char *macstr; | |
605 | XenNetDev *net; | |
606 | MACAddr mac; | |
607 | ||
608 | if (qemu_strtoul(name, NULL, 10, &number) || number >= INT_MAX) { | |
609 | error_setg(errp, "failed to parse name '%s'", name); | |
610 | goto fail; | |
611 | } | |
612 | ||
613 | trace_xen_netdev_create(number); | |
614 | ||
615 | macstr = qdict_get_try_str(opts, "mac"); | |
616 | if (macstr == NULL) { | |
617 | error_setg(errp, "no MAC address found"); | |
618 | goto fail; | |
619 | } | |
620 | ||
621 | if (net_parse_macaddr(mac.a, macstr) < 0) { | |
622 | error_setg(errp, "failed to parse MAC address"); | |
623 | goto fail; | |
624 | } | |
625 | ||
626 | xendev = XEN_DEVICE(qdev_new(TYPE_XEN_NET_DEVICE)); | |
627 | net = XEN_NET_DEVICE(xendev); | |
628 | ||
629 | net->dev = number; | |
630 | memcpy(&net->conf.macaddr, &mac, sizeof(mac)); | |
631 | ||
632 | if (qdev_realize_and_unref(DEVICE(xendev), BUS(xenbus), errp)) { | |
633 | xen_backend_set_device(backend, xendev); | |
634 | return; | |
635 | } | |
636 | ||
637 | error_prepend(errp, "realization of net device %lu failed: ", | |
638 | number); | |
639 | ||
640 | fail: | |
641 | if (xendev) { | |
642 | object_unparent(OBJECT(xendev)); | |
643 | } | |
644 | } | |
645 | ||
646 | static void xen_net_device_destroy(XenBackendInstance *backend, | |
647 | Error **errp) | |
648 | { | |
649 | ERRP_GUARD(); | |
650 | XenDevice *xendev = xen_backend_get_device(backend); | |
651 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
652 | ||
653 | trace_xen_netdev_destroy(netdev->dev); | |
654 | ||
655 | object_unparent(OBJECT(xendev)); | |
656 | } | |
657 | ||
658 | static const XenBackendInfo xen_net_backend_info = { | |
659 | .type = "qnic", | |
660 | .create = xen_net_device_create, | |
661 | .destroy = xen_net_device_destroy, | |
662 | }; | |
663 | ||
664 | static void xen_net_register_backend(void) | |
665 | { | |
666 | xen_backend_register(&xen_net_backend_info); | |
667 | } | |
668 | ||
669 | xen_backend_init(xen_net_register_backend); |