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e613b064 AL |
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 | |
8167ee88 | 16 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
6b620ca3 PB |
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. | |
e613b064 AL |
20 | */ |
21 | ||
21cbfe5f | 22 | #include "qemu/osdep.h" |
25967ff6 DW |
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 | ||
e613b064 AL |
30 | #include <sys/socket.h> |
31 | #include <sys/ioctl.h> | |
e613b064 | 32 | #include <sys/wait.h> |
e613b064 | 33 | |
1422e32d | 34 | #include "net/net.h" |
7200ac3c | 35 | #include "net/checksum.h" |
658788c5 | 36 | #include "net/util.h" |
25967ff6 DW |
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" | |
e613b064 | 42 | |
a3434a2d | 43 | #include "hw/xen/interface/io/netif.h" |
25967ff6 DW |
44 | #include "hw/xen/interface/io/xs_wire.h" |
45 | ||
46 | #include "trace.h" | |
b41f6719 | 47 | |
e613b064 AL |
48 | /* ------------------------------------------------------------- */ |
49 | ||
50 | struct XenNetDev { | |
25967ff6 DW |
51 | struct XenDevice xendev; /* must be first */ |
52 | XenEventChannel *event_channel; | |
53 | int dev; | |
e613b064 | 54 | int tx_work; |
25967ff6 DW |
55 | unsigned int tx_ring_ref; |
56 | unsigned int rx_ring_ref; | |
e613b064 AL |
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; | |
658788c5 MM |
61 | NICConf conf; |
62 | NICState *nic; | |
e613b064 AL |
63 | }; |
64 | ||
25967ff6 DW |
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 | ||
e613b064 AL |
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 | |
209cd7ab AP |
83 | if (txp->flags & NETTXF_extra_info) { |
84 | RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL; | |
85 | } | |
e613b064 AL |
86 | #endif |
87 | ||
88 | netdev->tx_ring.rsp_prod_pvt = ++i; | |
89 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify); | |
209cd7ab | 90 | if (notify) { |
25967ff6 DW |
91 | xen_device_notify_event_channel(XEN_DEVICE(netdev), |
92 | netdev->event_channel, NULL); | |
209cd7ab | 93 | } |
e613b064 AL |
94 | |
95 | if (i == netdev->tx_ring.req_cons) { | |
209cd7ab AP |
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 | } | |
e613b064 AL |
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 { | |
209cd7ab AP |
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++); | |
e613b064 AL |
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 | ||
25967ff6 | 128 | static bool net_tx_packets(struct XenNetDev *netdev) |
e613b064 | 129 | { |
25967ff6 | 130 | bool done_something = false; |
e613b064 AL |
131 | netif_tx_request_t txreq; |
132 | RING_IDX rc, rp; | |
133 | void *page; | |
134 | void *tmpbuf = NULL; | |
135 | ||
25967ff6 DW |
136 | assert(qemu_mutex_iothread_locked()); |
137 | ||
e613b064 | 138 | for (;;) { |
209cd7ab AP |
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'. */ | |
e613b064 | 142 | |
209cd7ab AP |
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; | |
25967ff6 | 149 | done_something = true; |
e613b064 AL |
150 | |
151 | #if 1 | |
209cd7ab AP |
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) { | |
25967ff6 DW |
155 | qemu_log_mask(LOG_UNIMP, "vif%u: FIXME: extra info flag\n", |
156 | netdev->dev); | |
209cd7ab AP |
157 | net_tx_error(netdev, &txreq, rc); |
158 | continue; | |
159 | } | |
160 | if (txreq.flags & NETTXF_more_data) { | |
25967ff6 DW |
161 | qemu_log_mask(LOG_UNIMP, "vif%u: FIXME: more data flag\n", |
162 | netdev->dev); | |
209cd7ab AP |
163 | net_tx_error(netdev, &txreq, rc); |
164 | continue; | |
165 | } | |
e613b064 AL |
166 | #endif |
167 | ||
209cd7ab | 168 | if (txreq.size < 14) { |
25967ff6 DW |
169 | qemu_log_mask(LOG_GUEST_ERROR, "vif%u: bad packet size: %d\n", |
170 | netdev->dev, txreq.size); | |
209cd7ab AP |
171 | net_tx_error(netdev, &txreq, rc); |
172 | continue; | |
173 | } | |
174 | ||
a9ae1418 | 175 | if ((txreq.offset + txreq.size) > XEN_PAGE_SIZE) { |
25967ff6 DW |
176 | qemu_log_mask(LOG_GUEST_ERROR, "vif%u: error: page crossing\n", |
177 | netdev->dev); | |
209cd7ab AP |
178 | net_tx_error(netdev, &txreq, rc); |
179 | continue; | |
180 | } | |
181 | ||
25967ff6 DW |
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" : ""); | |
209cd7ab | 188 | |
25967ff6 DW |
189 | page = xen_device_map_grant_refs(&netdev->xendev, &txreq.gref, 1, |
190 | PROT_READ, NULL); | |
209cd7ab | 191 | if (page == NULL) { |
25967ff6 DW |
192 | qemu_log_mask(LOG_GUEST_ERROR, |
193 | "vif%u: tx gref dereference failed (%d)\n", | |
194 | netdev->dev, txreq.gref); | |
209cd7ab AP |
195 | net_tx_error(netdev, &txreq, rc); |
196 | continue; | |
197 | } | |
198 | if (txreq.flags & NETTXF_csum_blank) { | |
e613b064 | 199 | /* have read-only mapping -> can't fill checksum in-place */ |
209cd7ab | 200 | if (!tmpbuf) { |
a9ae1418 | 201 | tmpbuf = g_malloc(XEN_PAGE_SIZE); |
209cd7ab | 202 | } |
e613b064 | 203 | memcpy(tmpbuf, page + txreq.offset, txreq.size); |
f5746335 | 204 | net_checksum_calculate(tmpbuf, txreq.size, CSUM_ALL); |
b356f76d JW |
205 | qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf, |
206 | txreq.size); | |
e613b064 | 207 | } else { |
b356f76d JW |
208 | qemu_send_packet(qemu_get_queue(netdev->nic), |
209 | page + txreq.offset, txreq.size); | |
e613b064 | 210 | } |
25967ff6 DW |
211 | xen_device_unmap_grant_refs(&netdev->xendev, page, &txreq.gref, 1, |
212 | NULL); | |
209cd7ab AP |
213 | net_tx_response(netdev, &txreq, NETIF_RSP_OKAY); |
214 | } | |
215 | if (!netdev->tx_work) { | |
216 | break; | |
217 | } | |
218 | netdev->tx_work = 0; | |
e613b064 | 219 | } |
7267c094 | 220 | g_free(tmpbuf); |
25967ff6 | 221 | return done_something; |
e613b064 AL |
222 | } |
223 | ||
224 | /* ------------------------------------------------------------- */ | |
225 | ||
226 | static void net_rx_response(struct XenNetDev *netdev, | |
209cd7ab AP |
227 | netif_rx_request_t *req, int8_t st, |
228 | uint16_t offset, uint16_t size, | |
229 | uint16_t flags) | |
e613b064 AL |
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; | |
209cd7ab AP |
240 | if (st < 0) { |
241 | resp->status = (int16_t)st; | |
242 | } | |
e613b064 | 243 | |
25967ff6 | 244 | trace_xen_netdev_rx(netdev->dev, i, resp->status, resp->flags); |
e613b064 AL |
245 | |
246 | netdev->rx_ring.rsp_prod_pvt = ++i; | |
247 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify); | |
209cd7ab | 248 | if (notify) { |
25967ff6 DW |
249 | xen_device_notify_event_channel(XEN_DEVICE(netdev), |
250 | netdev->event_channel, NULL); | |
209cd7ab | 251 | } |
e613b064 AL |
252 | } |
253 | ||
254 | #define NET_IP_ALIGN 2 | |
255 | ||
4e68f7a0 | 256 | static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size) |
e613b064 | 257 | { |
cc1f0f45 | 258 | struct XenNetDev *netdev = qemu_get_nic_opaque(nc); |
e613b064 AL |
259 | netif_rx_request_t rxreq; |
260 | RING_IDX rc, rp; | |
261 | void *page; | |
262 | ||
25967ff6 DW |
263 | assert(qemu_mutex_iothread_locked()); |
264 | ||
265 | if (xen_device_backend_get_state(&netdev->xendev) != XenbusStateConnected) { | |
209cd7ab AP |
266 | return -1; |
267 | } | |
e613b064 AL |
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)) { | |
7bba83bf | 274 | return 0; |
e613b064 | 275 | } |
a9ae1418 | 276 | if (size > XEN_PAGE_SIZE - NET_IP_ALIGN) { |
25967ff6 DW |
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); | |
209cd7ab | 280 | return -1; |
e613b064 AL |
281 | } |
282 | ||
283 | memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq)); | |
284 | netdev->rx_ring.req_cons = ++rc; | |
285 | ||
25967ff6 DW |
286 | page = xen_device_map_grant_refs(&netdev->xendev, &rxreq.gref, 1, |
287 | PROT_WRITE, NULL); | |
e613b064 | 288 | if (page == NULL) { |
25967ff6 DW |
289 | qemu_log_mask(LOG_GUEST_ERROR, |
290 | "vif%u: rx gref dereference failed (%d)\n", | |
291 | netdev->dev, rxreq.gref); | |
209cd7ab AP |
292 | net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0); |
293 | return -1; | |
e613b064 AL |
294 | } |
295 | memcpy(page + NET_IP_ALIGN, buf, size); | |
25967ff6 | 296 | xen_device_unmap_grant_refs(&netdev->xendev, page, &rxreq.gref, 1, NULL); |
e613b064 | 297 | net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0); |
4f1c942b MM |
298 | |
299 | return size; | |
e613b064 AL |
300 | } |
301 | ||
302 | /* ------------------------------------------------------------- */ | |
303 | ||
658788c5 | 304 | static NetClientInfo net_xen_info = { |
f394b2e2 | 305 | .type = NET_CLIENT_DRIVER_NIC, |
658788c5 | 306 | .size = sizeof(NICState), |
658788c5 MM |
307 | .receive = net_rx_packet, |
308 | }; | |
309 | ||
25967ff6 | 310 | static void xen_netdev_realize(XenDevice *xendev, Error **errp) |
e613b064 | 311 | { |
25967ff6 DW |
312 | ERRP_GUARD(); |
313 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
314 | NetClientState *nc; | |
e613b064 | 315 | |
25967ff6 | 316 | qemu_macaddr_default_if_unset(&netdev->conf.macaddr); |
e613b064 | 317 | |
25967ff6 DW |
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]); | |
658788c5 | 325 | |
658788c5 | 326 | netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf, |
25967ff6 | 327 | object_get_typename(OBJECT(xendev)), |
7d0fefdf AO |
328 | DEVICE(xendev)->id, |
329 | &xendev->qdev.mem_reentrancy_guard, netdev); | |
658788c5 | 330 | |
25967ff6 DW |
331 | nc = qemu_get_queue(netdev->nic); |
332 | qemu_format_nic_info_str(nc, netdev->conf.macaddr.a); | |
e613b064 AL |
333 | |
334 | /* fill info */ | |
25967ff6 DW |
335 | xen_device_backend_printf(xendev, "feature-rx-copy", "%u", 1); |
336 | xen_device_backend_printf(xendev, "feature-rx-flip", "%u", 0); | |
e613b064 | 337 | |
25967ff6 DW |
338 | trace_xen_netdev_realize(netdev->dev, nc->info_str, nc->peer ? |
339 | nc->peer->name : "(none)"); | |
e613b064 AL |
340 | } |
341 | ||
25967ff6 | 342 | static bool net_event(void *_xendev) |
e613b064 | 343 | { |
25967ff6 DW |
344 | XenNetDev *netdev = XEN_NET_DEVICE(_xendev); |
345 | bool done_something; | |
e613b064 | 346 | |
25967ff6 DW |
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 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
355 | unsigned int port, rx_copy; | |
356 | ||
357 | assert(qemu_mutex_iothread_locked()); | |
358 | ||
359 | if (xen_device_frontend_scanf(xendev, "tx-ring-ref", "%u", | |
360 | &netdev->tx_ring_ref) != 1) { | |
361 | error_setg(errp, "failed to read tx-ring-ref"); | |
362 | return false; | |
209cd7ab | 363 | } |
25967ff6 DW |
364 | |
365 | if (xen_device_frontend_scanf(xendev, "rx-ring-ref", "%u", | |
366 | &netdev->rx_ring_ref) != 1) { | |
367 | error_setg(errp, "failed to read rx-ring-ref"); | |
368 | return false; | |
209cd7ab | 369 | } |
25967ff6 DW |
370 | |
371 | if (xen_device_frontend_scanf(xendev, "event-channel", "%u", | |
372 | &port) != 1) { | |
373 | error_setg(errp, "failed to read event-channel"); | |
374 | return false; | |
209cd7ab | 375 | } |
e613b064 | 376 | |
25967ff6 DW |
377 | if (xen_device_frontend_scanf(xendev, "request-rx-copy", "%u", |
378 | &rx_copy) != 1) { | |
209cd7ab AP |
379 | rx_copy = 0; |
380 | } | |
e613b064 | 381 | if (rx_copy == 0) { |
25967ff6 DW |
382 | error_setg(errp, "frontend doesn't support rx-copy"); |
383 | return false; | |
e613b064 AL |
384 | } |
385 | ||
25967ff6 DW |
386 | netdev->txs = xen_device_map_grant_refs(xendev, |
387 | &netdev->tx_ring_ref, 1, | |
388 | PROT_READ | PROT_WRITE, | |
389 | errp); | |
b4f72e31 | 390 | if (!netdev->txs) { |
25967ff6 DW |
391 | error_prepend(errp, "failed to map tx grant ref: "); |
392 | return false; | |
b4f72e31 | 393 | } |
25967ff6 DW |
394 | |
395 | netdev->rxs = xen_device_map_grant_refs(xendev, | |
396 | &netdev->rx_ring_ref, 1, | |
397 | PROT_READ | PROT_WRITE, | |
398 | errp); | |
b4f72e31 | 399 | if (!netdev->rxs) { |
25967ff6 DW |
400 | error_prepend(errp, "failed to map rx grant ref: "); |
401 | return false; | |
209cd7ab | 402 | } |
25967ff6 | 403 | |
a9ae1418 DW |
404 | BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XEN_PAGE_SIZE); |
405 | BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XEN_PAGE_SIZE); | |
e613b064 | 406 | |
25967ff6 DW |
407 | netdev->event_channel = xen_device_bind_event_channel(xendev, port, |
408 | net_event, | |
409 | netdev, | |
410 | errp); | |
411 | if (!netdev->event_channel) { | |
412 | return false; | |
413 | } | |
e613b064 | 414 | |
25967ff6 DW |
415 | trace_xen_netdev_connect(netdev->dev, netdev->tx_ring_ref, |
416 | netdev->rx_ring_ref, port); | |
3e3cabcf GH |
417 | |
418 | net_tx_packets(netdev); | |
25967ff6 | 419 | return true; |
e613b064 AL |
420 | } |
421 | ||
25967ff6 | 422 | static void xen_netdev_disconnect(XenDevice *xendev, Error **errp) |
e613b064 | 423 | { |
25967ff6 DW |
424 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); |
425 | ||
426 | trace_xen_netdev_disconnect(netdev->dev); | |
427 | ||
428 | assert(qemu_mutex_iothread_locked()); | |
e613b064 | 429 | |
25967ff6 DW |
430 | netdev->tx_ring.sring = NULL; |
431 | netdev->rx_ring.sring = NULL; | |
e613b064 | 432 | |
25967ff6 DW |
433 | if (netdev->event_channel) { |
434 | xen_device_unbind_event_channel(xendev, netdev->event_channel, | |
435 | errp); | |
436 | netdev->event_channel = NULL; | |
437 | } | |
e613b064 | 438 | if (netdev->txs) { |
25967ff6 DW |
439 | xen_device_unmap_grant_refs(xendev, netdev->txs, |
440 | &netdev->tx_ring_ref, 1, errp); | |
209cd7ab | 441 | netdev->txs = NULL; |
e613b064 AL |
442 | } |
443 | if (netdev->rxs) { | |
25967ff6 DW |
444 | xen_device_unmap_grant_refs(xendev, netdev->rxs, |
445 | &netdev->rx_ring_ref, 1, errp); | |
209cd7ab | 446 | netdev->rxs = NULL; |
e613b064 | 447 | } |
e613b064 AL |
448 | } |
449 | ||
25967ff6 DW |
450 | /* -------------------------------------------------------------------- */ |
451 | ||
452 | ||
453 | static void xen_netdev_frontend_changed(XenDevice *xendev, | |
454 | enum xenbus_state frontend_state, | |
455 | Error **errp) | |
e613b064 | 456 | { |
25967ff6 DW |
457 | ERRP_GUARD(); |
458 | enum xenbus_state backend_state = xen_device_backend_get_state(xendev); | |
459 | ||
460 | trace_xen_netdev_frontend_changed(xendev->name, frontend_state); | |
461 | ||
462 | switch (frontend_state) { | |
463 | case XenbusStateConnected: | |
464 | if (backend_state == XenbusStateConnected) { | |
465 | break; | |
466 | } | |
467 | ||
468 | xen_netdev_disconnect(xendev, errp); | |
469 | if (*errp) { | |
470 | break; | |
471 | } | |
472 | ||
473 | if (!xen_netdev_connect(xendev, errp)) { | |
474 | xen_netdev_disconnect(xendev, NULL); | |
475 | xen_device_backend_set_state(xendev, XenbusStateClosing); | |
476 | break; | |
477 | } | |
478 | ||
479 | xen_device_backend_set_state(xendev, XenbusStateConnected); | |
480 | break; | |
481 | ||
482 | case XenbusStateClosing: | |
483 | xen_device_backend_set_state(xendev, XenbusStateClosing); | |
484 | break; | |
485 | ||
486 | case XenbusStateClosed: | |
487 | case XenbusStateUnknown: | |
488 | xen_netdev_disconnect(xendev, errp); | |
489 | if (*errp) { | |
490 | break; | |
491 | } | |
492 | ||
493 | xen_device_backend_set_state(xendev, XenbusStateClosed); | |
494 | break; | |
495 | ||
496 | case XenbusStateInitialised: | |
497 | /* | |
498 | * Linux netback does nothing on the frontend going (back) to | |
499 | * XenbusStateInitialised, so do the same here. | |
500 | */ | |
501 | default: | |
502 | break; | |
503 | } | |
e613b064 AL |
504 | } |
505 | ||
25967ff6 | 506 | static char *xen_netdev_get_name(XenDevice *xendev, Error **errp) |
e613b064 | 507 | { |
25967ff6 DW |
508 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); |
509 | ||
510 | if (netdev->dev == -1) { | |
511 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); | |
512 | char fe_path[XENSTORE_ABS_PATH_MAX + 1]; | |
513 | int idx = (xen_mode == XEN_EMULATE) ? 0 : 1; | |
514 | char *value; | |
515 | ||
516 | /* Theoretically we could go up to INT_MAX here but that's overkill */ | |
517 | while (idx < 100) { | |
518 | snprintf(fe_path, sizeof(fe_path), | |
519 | "/local/domain/%u/device/vif/%u", | |
520 | xendev->frontend_id, idx); | |
521 | value = qemu_xen_xs_read(xenbus->xsh, XBT_NULL, fe_path, NULL); | |
522 | if (!value) { | |
523 | if (errno == ENOENT) { | |
524 | netdev->dev = idx; | |
525 | goto found; | |
526 | } | |
527 | error_setg(errp, "cannot read %s: %s", fe_path, | |
528 | strerror(errno)); | |
529 | return NULL; | |
530 | } | |
531 | free(value); | |
532 | idx++; | |
533 | } | |
534 | error_setg(errp, "cannot find device index for netdev device"); | |
535 | return NULL; | |
536 | } | |
537 | found: | |
538 | return g_strdup_printf("%u", netdev->dev); | |
539 | } | |
540 | ||
541 | static void xen_netdev_unrealize(XenDevice *xendev) | |
542 | { | |
543 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
544 | ||
545 | trace_xen_netdev_unrealize(netdev->dev); | |
546 | ||
547 | /* Disconnect from the frontend in case this has not already happened */ | |
548 | xen_netdev_disconnect(xendev, NULL); | |
e613b064 | 549 | |
d4685837 CG |
550 | if (netdev->nic) { |
551 | qemu_del_nic(netdev->nic); | |
d4685837 | 552 | } |
e613b064 AL |
553 | } |
554 | ||
555 | /* ------------------------------------------------------------- */ | |
556 | ||
25967ff6 DW |
557 | static Property xen_netdev_properties[] = { |
558 | DEFINE_NIC_PROPERTIES(XenNetDev, conf), | |
559 | DEFINE_PROP_INT32("idx", XenNetDev, dev, -1), | |
560 | DEFINE_PROP_END_OF_LIST(), | |
561 | }; | |
562 | ||
563 | static void xen_netdev_class_init(ObjectClass *class, void *data) | |
564 | { | |
565 | DeviceClass *dev_class = DEVICE_CLASS(class); | |
566 | XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); | |
567 | ||
568 | xendev_class->backend = "qnic"; | |
569 | xendev_class->device = "vif"; | |
570 | xendev_class->get_name = xen_netdev_get_name; | |
571 | xendev_class->realize = xen_netdev_realize; | |
572 | xendev_class->frontend_changed = xen_netdev_frontend_changed; | |
573 | xendev_class->unrealize = xen_netdev_unrealize; | |
574 | set_bit(DEVICE_CATEGORY_NETWORK, dev_class->categories); | |
575 | dev_class->user_creatable = true; | |
576 | ||
577 | device_class_set_props(dev_class, xen_netdev_properties); | |
578 | } | |
579 | ||
580 | static const TypeInfo xen_net_type_info = { | |
581 | .name = TYPE_XEN_NET_DEVICE, | |
582 | .parent = TYPE_XEN_DEVICE, | |
583 | .instance_size = sizeof(XenNetDev), | |
584 | .class_init = xen_netdev_class_init, | |
585 | }; | |
586 | ||
587 | static void xen_net_register_types(void) | |
588 | { | |
589 | type_register_static(&xen_net_type_info); | |
590 | } | |
591 | ||
592 | type_init(xen_net_register_types) | |
593 | ||
594 | /* Called to instantiate a XenNetDev when the backend is detected. */ | |
595 | static void xen_net_device_create(XenBackendInstance *backend, | |
596 | QDict *opts, Error **errp) | |
597 | { | |
598 | ERRP_GUARD(); | |
599 | XenBus *xenbus = xen_backend_get_bus(backend); | |
600 | const char *name = xen_backend_get_name(backend); | |
601 | XenDevice *xendev = NULL; | |
602 | unsigned long number; | |
603 | const char *macstr; | |
604 | XenNetDev *net; | |
605 | MACAddr mac; | |
606 | ||
607 | if (qemu_strtoul(name, NULL, 10, &number) || number >= INT_MAX) { | |
608 | error_setg(errp, "failed to parse name '%s'", name); | |
609 | goto fail; | |
610 | } | |
611 | ||
612 | trace_xen_netdev_create(number); | |
613 | ||
614 | macstr = qdict_get_try_str(opts, "mac"); | |
615 | if (macstr == NULL) { | |
616 | error_setg(errp, "no MAC address found"); | |
617 | goto fail; | |
618 | } | |
619 | ||
620 | if (net_parse_macaddr(mac.a, macstr) < 0) { | |
621 | error_setg(errp, "failed to parse MAC address"); | |
622 | goto fail; | |
623 | } | |
624 | ||
625 | xendev = XEN_DEVICE(qdev_new(TYPE_XEN_NET_DEVICE)); | |
626 | net = XEN_NET_DEVICE(xendev); | |
627 | ||
628 | net->dev = number; | |
629 | memcpy(&net->conf.macaddr, &mac, sizeof(mac)); | |
630 | ||
631 | if (qdev_realize_and_unref(DEVICE(xendev), BUS(xenbus), errp)) { | |
632 | xen_backend_set_device(backend, xendev); | |
633 | return; | |
634 | } | |
635 | ||
636 | error_prepend(errp, "realization of net device %lu failed: ", | |
637 | number); | |
638 | ||
639 | fail: | |
640 | if (xendev) { | |
641 | object_unparent(OBJECT(xendev)); | |
642 | } | |
643 | } | |
644 | ||
645 | static void xen_net_device_destroy(XenBackendInstance *backend, | |
646 | Error **errp) | |
647 | { | |
648 | ERRP_GUARD(); | |
649 | XenDevice *xendev = xen_backend_get_device(backend); | |
650 | XenNetDev *netdev = XEN_NET_DEVICE(xendev); | |
651 | ||
652 | trace_xen_netdev_destroy(netdev->dev); | |
653 | ||
654 | object_unparent(OBJECT(xendev)); | |
655 | } | |
656 | ||
657 | static const XenBackendInfo xen_net_backend_info = { | |
658 | .type = "qnic", | |
659 | .create = xen_net_device_create, | |
660 | .destroy = xen_net_device_destroy, | |
e613b064 | 661 | }; |
25967ff6 DW |
662 | |
663 | static void xen_net_register_backend(void) | |
664 | { | |
665 | xen_backend_register(&xen_net_backend_info); | |
666 | } | |
667 | ||
668 | xen_backend_init(xen_net_register_backend); |