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