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if_vtnet - Disable rx csum offload due to unsupported ipv6 rx csum offload.
[dragonfly.git] / sys / dev / virtual / virtio / net / if_vtnet.c
blob467e1907c0970dbdf94709ff6ea1250584ed3c48
1 /*-
2 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 /* Driver for VirtIO network devices. */
28
29 #include <sys/cdefs.h>
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/sockio.h>
35 #include <sys/mbuf.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/socket.h>
39 #include <sys/sysctl.h>
40 #include <sys/taskqueue.h>
41 #include <sys/random.h>
42 #include <sys/sglist.h>
43 #include <sys/serialize.h>
44 #include <sys/bus.h>
45 #include <sys/rman.h>
46
47 #include <machine/limits.h>
48
49 #include <net/ethernet.h>
50 #include <net/if.h>
51 #include <net/if_arp.h>
52 #include <net/if_dl.h>
53 #include <net/if_types.h>
54 #include <net/if_media.h>
55 #include <net/vlan/if_vlan_var.h>
56 #include <net/vlan/if_vlan_ether.h>
57 #include <net/ifq_var.h>
58
59 #include <net/bpf.h>
60
61 #include <netinet/in_systm.h>
62 #include <netinet/in.h>
63 #include <netinet/ip.h>
64 #include <netinet/ip6.h>
65 #include <netinet/udp.h>
66 #include <netinet/tcp.h>
67
68 #include <dev/virtual/virtio/virtio/virtio.h>
69 #include <dev/virtual/virtio/virtio/virtqueue.h>
70 #include <dev/virtual/virtio/net/virtio_net.h>
71 #include <dev/virtual/virtio/net/if_vtnetvar.h>
72
73 #include "virtio_if.h"
74
75 MALLOC_DEFINE(M_VTNET, "VTNET_TX", "Outgoing VTNET TX frame header");
76
77 static int vtnet_probe(device_t);
78 static int vtnet_attach(device_t);
79 static int vtnet_detach(device_t);
80 static int vtnet_suspend(device_t);
81 static int vtnet_resume(device_t);
82 static int vtnet_shutdown(device_t);
83 static int vtnet_config_change(device_t);
84
85 static void vtnet_negotiate_features(struct vtnet_softc *);
86 static int vtnet_alloc_virtqueues(struct vtnet_softc *);
87 static void vtnet_get_hwaddr(struct vtnet_softc *);
88 static void vtnet_set_hwaddr(struct vtnet_softc *);
89 static int vtnet_is_link_up(struct vtnet_softc *);
90 static void vtnet_update_link_status(struct vtnet_softc *);
91 #if 0
92 static void vtnet_watchdog(struct vtnet_softc *);
93 #endif
94 static void vtnet_config_change_task(void *, int);
95 static int vtnet_setup_interface(struct vtnet_softc *);
96 static int vtnet_change_mtu(struct vtnet_softc *, int);
97 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
98
99 static int vtnet_init_rx_vq(struct vtnet_softc *);
100 static void vtnet_free_rx_mbufs(struct vtnet_softc *);
101 static void vtnet_free_tx_mbufs(struct vtnet_softc *);
102 static void vtnet_free_ctrl_vq(struct vtnet_softc *);
103
104 static struct mbuf * vtnet_alloc_rxbuf(struct vtnet_softc *, int,
105 struct mbuf **);
106 static int vtnet_replace_rxbuf(struct vtnet_softc *,
107 struct mbuf *, int);
108 static int vtnet_newbuf(struct vtnet_softc *);
109 static void vtnet_discard_merged_rxbuf(struct vtnet_softc *, int);
110 static void vtnet_discard_rxbuf(struct vtnet_softc *, struct mbuf *);
111 static int vtnet_enqueue_rxbuf(struct vtnet_softc *, struct mbuf *);
112 static void vtnet_vlan_tag_remove(struct mbuf *);
113 static int vtnet_rx_csum(struct vtnet_softc *, struct mbuf *,
114 struct virtio_net_hdr *);
115 static int vtnet_rxeof_merged(struct vtnet_softc *, struct mbuf *, int);
116 static int vtnet_rxeof(struct vtnet_softc *, int, int *);
117 static void vtnet_rx_intr_task(void *);
118 static int vtnet_rx_vq_intr(void *);
119
120 static void vtnet_enqueue_txhdr(struct vtnet_softc *,
121 struct vtnet_tx_header *);
122 static void vtnet_txeof(struct vtnet_softc *);
123 static struct mbuf * vtnet_tx_offload(struct vtnet_softc *, struct mbuf *,
124 struct virtio_net_hdr *);
125 static int vtnet_enqueue_txbuf(struct vtnet_softc *, struct mbuf **,
126 struct vtnet_tx_header *);
127 static int vtnet_encap(struct vtnet_softc *, struct mbuf **);
128 static void vtnet_start_locked(struct ifnet *, struct ifaltq_subque *);
129 static void vtnet_start(struct ifnet *, struct ifaltq_subque *);
130 static void vtnet_tick(void *);
131 static void vtnet_tx_intr_task(void *);
132 static int vtnet_tx_vq_intr(void *);
133
134 static void vtnet_stop(struct vtnet_softc *);
135 static int vtnet_virtio_reinit(struct vtnet_softc *);
136 static void vtnet_init_locked(struct vtnet_softc *);
137 static void vtnet_init(void *);
138
139 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *,
140 struct sglist *, int, int);
141
142 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *);
143 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, int, int);
144 static int vtnet_set_promisc(struct vtnet_softc *, int);
145 static int vtnet_set_allmulti(struct vtnet_softc *, int);
146 static void vtnet_rx_filter(struct vtnet_softc *sc);
147 static void vtnet_rx_filter_mac(struct vtnet_softc *);
148
149 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t);
150 static void vtnet_rx_filter_vlan(struct vtnet_softc *);
151 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t);
152 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t);
153 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t);
154
155 static int vtnet_ifmedia_upd(struct ifnet *);
156 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *);
157
158 static void vtnet_add_statistics(struct vtnet_softc *);
159
160 static int vtnet_enable_rx_intr(struct vtnet_softc *);
161 static int vtnet_enable_tx_intr(struct vtnet_softc *);
162 static void vtnet_disable_rx_intr(struct vtnet_softc *);
163 static void vtnet_disable_tx_intr(struct vtnet_softc *);
164
165 /* Tunables. */
166 static int vtnet_csum_disable = 0;
167 TUNABLE_INT("hw.vtnet.csum_disable", &vtnet_csum_disable);
168 static int vtnet_tso_disable = 1;
169 TUNABLE_INT("hw.vtnet.tso_disable", &vtnet_tso_disable);
170 static int vtnet_lro_disable = 0;
171 TUNABLE_INT("hw.vtnet.lro_disable", &vtnet_lro_disable);
172
173 /*
174 * Reducing the number of transmit completed interrupts can
175 * improve performance. To do so, the define below keeps the
176 * Tx vq interrupt disabled and adds calls to vtnet_txeof()
177 * in the start and watchdog paths. The price to pay for this
178 * is the m_free'ing of transmitted mbufs may be delayed until
179 * the watchdog fires.
180 */
181 #define VTNET_TX_INTR_MODERATION
182
183 static struct virtio_feature_desc vtnet_feature_desc[] = {
184 { VIRTIO_NET_F_CSUM, "TxChecksum" },
185 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" },
186 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "DynOffload" },
187 { VIRTIO_NET_F_MAC, "MacAddress" },
188 { VIRTIO_NET_F_GSO, "TxAllGSO" },
189 { VIRTIO_NET_F_GUEST_TSO4, "RxTSOv4" },
190 { VIRTIO_NET_F_GUEST_TSO6, "RxTSOv6" },
191 { VIRTIO_NET_F_GUEST_ECN, "RxECN" },
192 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" },
193 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" },
194 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" },
195 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" },
196 { VIRTIO_NET_F_HOST_UFO, "TxUFO" },
197 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" },
198 { VIRTIO_NET_F_STATUS, "Status" },
199 { VIRTIO_NET_F_CTRL_VQ, "ControlVq" },
200 { VIRTIO_NET_F_CTRL_RX, "RxMode" },
201 { VIRTIO_NET_F_CTRL_VLAN, "VLanFilter" },
202 { VIRTIO_NET_F_CTRL_RX_EXTRA, "RxModeExtra" },
203 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" },
204 { VIRTIO_NET_F_MQ, "RFS" },
205 { VIRTIO_NET_F_CTRL_MAC_ADDR, "SetMacAddress" },
206 { 0, NULL }
207 };
208
209 static device_method_t vtnet_methods[] = {
210 /* Device methods. */
211 DEVMETHOD(device_probe, vtnet_probe),
212 DEVMETHOD(device_attach, vtnet_attach),
213 DEVMETHOD(device_detach, vtnet_detach),
214 DEVMETHOD(device_suspend, vtnet_suspend),
215 DEVMETHOD(device_resume, vtnet_resume),
216 DEVMETHOD(device_shutdown, vtnet_shutdown),
217
218 /* VirtIO methods. */
219 DEVMETHOD(virtio_config_change, vtnet_config_change),
220
221 DEVMETHOD_END
222 };
223
224 static driver_t vtnet_driver = {
225 "vtnet",
226 vtnet_methods,
227 sizeof(struct vtnet_softc)
228 };
229
230 static devclass_t vtnet_devclass;
231
232 DRIVER_MODULE(vtnet, virtio_pci, vtnet_driver, vtnet_devclass, NULL, NULL);
233 MODULE_VERSION(vtnet, 1);
234 MODULE_DEPEND(vtnet, virtio, 1, 1, 1);
235
236 static int
237 vtnet_probe(device_t dev)
238 {
239 if (virtio_get_device_type(dev) != VIRTIO_ID_NETWORK)
240 return (ENXIO);
241
242 device_set_desc(dev, "VirtIO Networking Adapter");
243
244 return (BUS_PROBE_DEFAULT);
245 }
246
247 static int
248 vtnet_attach(device_t dev)
249 {
250 struct vtnet_softc *sc;
251 int error;
252
253 sc = device_get_softc(dev);
254 sc->vtnet_dev = dev;
255
256 lwkt_serialize_init(&sc->vtnet_slz);
257 callout_init(&sc->vtnet_tick_ch);
258
259 ifmedia_init(&sc->vtnet_media, IFM_IMASK, vtnet_ifmedia_upd,
260 vtnet_ifmedia_sts);
261 ifmedia_add(&sc->vtnet_media, VTNET_MEDIATYPE, 0, NULL);
262 ifmedia_set(&sc->vtnet_media, VTNET_MEDIATYPE);
263
264 vtnet_add_statistics(sc);
265 SLIST_INIT(&sc->vtnet_txhdr_free);
266
267 /* Register our feature descriptions. */
268 virtio_set_feature_desc(dev, vtnet_feature_desc);
269 vtnet_negotiate_features(sc);
270
271 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC))
272 sc->vtnet_flags |= VTNET_FLAG_INDIRECT;
273
274 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) {
275 /* This feature should always be negotiated. */
276 sc->vtnet_flags |= VTNET_FLAG_MAC;
277 }
278
279 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) {
280 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS;
281 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
282 } else {
283 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
284 }
285
286 sc->vtnet_rx_mbuf_size = MCLBYTES;
287 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc);
288
289 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
290 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ;
291
292 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
293 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX;
294 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN))
295 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER;
296 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
297 virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
298 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC;
299 }
300
301 /* Read (or generate) the MAC address for the adapter. */
302 vtnet_get_hwaddr(sc);
303
304 error = vtnet_alloc_virtqueues(sc);
305 if (error) {
306 device_printf(dev, "cannot allocate virtqueues\n");
307 goto fail;
308 }
309
310 error = vtnet_setup_interface(sc);
311 if (error) {
312 device_printf(dev, "cannot setup interface\n");
313 goto fail;
314 }
315
316 TASK_INIT(&sc->vtnet_cfgchg_task, 0, vtnet_config_change_task, sc);
317
318 error = virtio_setup_intr(dev, &sc->vtnet_slz);
319 if (error) {
320 device_printf(dev, "cannot setup virtqueue interrupts\n");
321 ether_ifdetach(sc->vtnet_ifp);
322 goto fail;
323 }
324
325 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) {
326 lwkt_serialize_enter(&sc->vtnet_slz);
327 vtnet_set_hwaddr(sc);
328 lwkt_serialize_exit(&sc->vtnet_slz);
329 }
330
331 /*
332 * Device defaults to promiscuous mode for backwards
333 * compatibility. Turn it off if possible.
334 */
335 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
336 lwkt_serialize_enter(&sc->vtnet_slz);
337 if (vtnet_set_promisc(sc, 0) != 0) {
338 sc->vtnet_ifp->if_flags |= IFF_PROMISC;
339 device_printf(dev,
340 "cannot disable promiscuous mode\n");
341 }
342 lwkt_serialize_exit(&sc->vtnet_slz);
343 } else
344 sc->vtnet_ifp->if_flags |= IFF_PROMISC;
345
346 fail:
347 if (error)
348 vtnet_detach(dev);
349
350 return (error);
351 }
352
353 static int
354 vtnet_detach(device_t dev)
355 {
356 struct vtnet_softc *sc;
357 struct ifnet *ifp;
358
359 sc = device_get_softc(dev);
360 ifp = sc->vtnet_ifp;
361
362 if (device_is_attached(dev)) {
363 lwkt_serialize_enter(&sc->vtnet_slz);
364 vtnet_stop(sc);
365 lwkt_serialize_exit(&sc->vtnet_slz);
366
367 callout_stop(&sc->vtnet_tick_ch);
368 taskqueue_drain(taskqueue_swi, &sc->vtnet_cfgchg_task);
369
370 ether_ifdetach(ifp);
371 }
372
373 if (sc->vtnet_vlan_attach != NULL) {
374 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach);
375 sc->vtnet_vlan_attach = NULL;
376 }
377 if (sc->vtnet_vlan_detach != NULL) {
378 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach);
379 sc->vtnet_vlan_detach = NULL;
380 }
381
382 if (ifp) {
383 if_free(ifp);
384 sc->vtnet_ifp = NULL;
385 }
386
387 if (sc->vtnet_rx_vq != NULL)
388 vtnet_free_rx_mbufs(sc);
389 if (sc->vtnet_tx_vq != NULL)
390 vtnet_free_tx_mbufs(sc);
391 if (sc->vtnet_ctrl_vq != NULL)
392 vtnet_free_ctrl_vq(sc);
393
394 if (sc->vtnet_txhdrarea != NULL) {
395 contigfree(sc->vtnet_txhdrarea,
396 sc->vtnet_txhdrcount * sizeof(struct vtnet_tx_header),
397 M_VTNET);
398 sc->vtnet_txhdrarea = NULL;
399 }
400 SLIST_INIT(&sc->vtnet_txhdr_free);
401 if (sc->vtnet_macfilter != NULL) {
402 contigfree(sc->vtnet_macfilter,
403 sizeof(struct vtnet_mac_filter), M_DEVBUF);
404 sc->vtnet_macfilter = NULL;
405 }
406
407 ifmedia_removeall(&sc->vtnet_media);
408
409 return (0);
410 }
411
412 static int
413 vtnet_suspend(device_t dev)
414 {
415 struct vtnet_softc *sc;
416
417 sc = device_get_softc(dev);
418
419 lwkt_serialize_enter(&sc->vtnet_slz);
420 vtnet_stop(sc);
421 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED;
422 lwkt_serialize_exit(&sc->vtnet_slz);
423
424 return (0);
425 }
426
427 static int
428 vtnet_resume(device_t dev)
429 {
430 struct vtnet_softc *sc;
431 struct ifnet *ifp;
432
433 sc = device_get_softc(dev);
434 ifp = sc->vtnet_ifp;
435
436 lwkt_serialize_enter(&sc->vtnet_slz);
437 if (ifp->if_flags & IFF_UP)
438 vtnet_init_locked(sc);
439 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED;
440 lwkt_serialize_exit(&sc->vtnet_slz);
441
442 return (0);
443 }
444
445 static int
446 vtnet_shutdown(device_t dev)
447 {
448
449 /*
450 * Suspend already does all of what we need to
451 * do here; we just never expect to be resumed.
452 */
453 return (vtnet_suspend(dev));
454 }
455
456 static int
457 vtnet_config_change(device_t dev)
458 {
459 struct vtnet_softc *sc;
460
461 sc = device_get_softc(dev);
462
463 taskqueue_enqueue(taskqueue_thread[mycpuid], &sc->vtnet_cfgchg_task);
464
465 return (1);
466 }
467
468 static void
469 vtnet_negotiate_features(struct vtnet_softc *sc)
470 {
471 device_t dev;
472 uint64_t mask, features;
473
474 dev = sc->vtnet_dev;
475 mask = 0;
476
477 if (vtnet_csum_disable)
478 mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
479
480 /*
481 * XXX DragonFly doesn't support receive checksum offload for ipv6 yet,
482 * hence always disable the virtio feature for now.
483 * XXX We need to support the DynOffload feature, in order to
484 * dynamically enable/disable this feature.
485 */
486 mask |= VIRTIO_NET_F_GUEST_CSUM;
487
488 /*
489 * TSO and LRO are only available when their corresponding checksum
490 * offload feature is also negotiated.
491 */
492
493 if (vtnet_csum_disable || vtnet_tso_disable)
494 mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 |
495 VIRTIO_NET_F_HOST_ECN;
496
497 if (vtnet_csum_disable || vtnet_lro_disable)
498 mask |= VTNET_LRO_FEATURES;
499
500 features = VTNET_FEATURES & ~mask;
501 features |= VIRTIO_F_NOTIFY_ON_EMPTY;
502 features |= VIRTIO_F_ANY_LAYOUT;
503 sc->vtnet_features = virtio_negotiate_features(dev, features);
504
505 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) &&
506 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) {
507 /*
508 * LRO without mergeable buffers requires special care. This
509 * is not ideal because every receive buffer must be large
510 * enough to hold the maximum TCP packet, the Ethernet header,
511 * and the header. This requires up to 34 descriptors with
512 * MCLBYTES clusters. If we do not have indirect descriptors,
513 * LRO is disabled since the virtqueue will not contain very
514 * many receive buffers.
515 */
516 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) {
517 device_printf(dev,
518 "LRO disabled due to both mergeable buffers and "
519 "indirect descriptors not negotiated\n");
520
521 features &= ~VTNET_LRO_FEATURES;
522 sc->vtnet_features =
523 virtio_negotiate_features(dev, features);
524 } else
525 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG;
526 }
527 }
528
529 static int
530 vtnet_alloc_virtqueues(struct vtnet_softc *sc)
531 {
532 device_t dev;
533 struct vq_alloc_info vq_info[3];
534 int nvqs;
535
536 dev = sc->vtnet_dev;
537 nvqs = 2;
538
539 /*
540 * Indirect descriptors are not needed for the Rx
541 * virtqueue when mergeable buffers are negotiated.
542 * The header is placed inline with the data, not
543 * in a separate descriptor, and mbuf clusters are
544 * always physically contiguous.
545 */
546 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
547 sc->vtnet_rx_nsegs = (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) ?
548 VTNET_MAX_RX_SEGS : VTNET_MIN_RX_SEGS;
549 } else
550 sc->vtnet_rx_nsegs = VTNET_MRG_RX_SEGS;
551
552 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) ||
553 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
554 sc->vtnet_tx_nsegs = VTNET_MAX_TX_SEGS;
555 else
556 sc->vtnet_tx_nsegs = VTNET_MIN_TX_SEGS;
557
558 VQ_ALLOC_INFO_INIT(&vq_info[0], sc->vtnet_rx_nsegs,
559 vtnet_rx_vq_intr, sc, &sc->vtnet_rx_vq,
560 "%s receive", device_get_nameunit(dev));
561
562 VQ_ALLOC_INFO_INIT(&vq_info[1], sc->vtnet_tx_nsegs,
563 vtnet_tx_vq_intr, sc, &sc->vtnet_tx_vq,
564 "%s transmit", device_get_nameunit(dev));
565
566 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
567 nvqs++;
568
569 VQ_ALLOC_INFO_INIT(&vq_info[2], 0, NULL, NULL,
570 &sc->vtnet_ctrl_vq, "%s control",
571 device_get_nameunit(dev));
572 }
573
574 return (virtio_alloc_virtqueues(dev, 0, nvqs, vq_info));
575 }
576
577 static int
578 vtnet_setup_interface(struct vtnet_softc *sc)
579 {
580 device_t dev;
581 struct ifnet *ifp;
582 int i;
583
584 dev = sc->vtnet_dev;
585
586 ifp = sc->vtnet_ifp = if_alloc(IFT_ETHER);
587 if (ifp == NULL) {
588 device_printf(dev, "cannot allocate ifnet structure\n");
589 return (ENOSPC);
590 }
591
592 ifp->if_softc = sc;
593 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
594 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
595 ifp->if_init = vtnet_init;
596 ifp->if_start = vtnet_start;
597 ifp->if_ioctl = vtnet_ioctl;
598
599 sc->vtnet_rx_process_limit = virtqueue_size(sc->vtnet_rx_vq);
600 sc->vtnet_tx_size = virtqueue_size(sc->vtnet_tx_vq);
601 if (sc->vtnet_flags & VTNET_FLAG_INDIRECT)
602 sc->vtnet_txhdrcount = sc->vtnet_tx_size;
603 else
604 sc->vtnet_txhdrcount = (sc->vtnet_tx_size / 2) + 1;
605 sc->vtnet_txhdrarea = contigmalloc(
606 sc->vtnet_txhdrcount * sizeof(struct vtnet_tx_header),
607 M_VTNET, M_WAITOK, 0, BUS_SPACE_MAXADDR, 4, 0);
608 if (sc->vtnet_txhdrarea == NULL) {
609 device_printf(dev, "cannot contigmalloc the tx headers\n");
610 return (ENOMEM);
611 }
612 for (i = 0; i < sc->vtnet_txhdrcount; i++)
613 vtnet_enqueue_txhdr(sc, &sc->vtnet_txhdrarea[i]);
614 sc->vtnet_macfilter = contigmalloc(
615 sizeof(struct vtnet_mac_filter),
616 M_DEVBUF, M_WAITOK, 0, BUS_SPACE_MAXADDR, 4, 0);
617 if (sc->vtnet_macfilter == NULL) {
618 device_printf(dev,
619 "cannot contigmalloc the mac filter table\n");
620 return (ENOMEM);
621 }
622 ifq_set_maxlen(&ifp->if_snd, sc->vtnet_tx_size - 1);
623 ifq_set_ready(&ifp->if_snd);
624
625 ether_ifattach(ifp, sc->vtnet_hwaddr, NULL);
626
627 /* Tell the upper layer(s) we support long frames. */
628 ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
629 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU;
630
631 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) {
632 ifp->if_capabilities |= IFCAP_TXCSUM;
633
634 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4))
635 ifp->if_capabilities |= IFCAP_TSO4;
636 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
637 ifp->if_capabilities |= IFCAP_TSO6;
638 if (ifp->if_capabilities & IFCAP_TSO)
639 ifp->if_capabilities |= IFCAP_VLAN_HWTSO;
640
641 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN))
642 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN;
643 }
644
645 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) {
646 ifp->if_capabilities |= IFCAP_RXCSUM;
647
648 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) ||
649 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6))
650 ifp->if_capabilities |= IFCAP_LRO;
651 }
652
653 if (ifp->if_capabilities & IFCAP_HWCSUM) {
654 /*
655 * VirtIO does not support VLAN tagging, but we can fake
656 * it by inserting and removing the 802.1Q header during
657 * transmit and receive. We are then able to do checksum
658 * offloading of VLAN frames.
659 */
660 ifp->if_capabilities |=
661 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM;
662 }
663
664 ifp->if_capenable = ifp->if_capabilities;
665
666 /*
667 * Capabilities after here are not enabled by default.
668 */
669
670 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
671 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER;
672
673 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
674 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
675 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
676 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
677 }
678
679 return (0);
680 }
681
682 static void
683 vtnet_set_hwaddr(struct vtnet_softc *sc)
684 {
685 device_t dev;
686
687 dev = sc->vtnet_dev;
688
689 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) &&
690 (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)) {
691 if (vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr) != 0)
692 device_printf(dev, "unable to set MAC address\n");
693 } else if (sc->vtnet_flags & VTNET_FLAG_MAC) {
694 virtio_write_device_config(dev,
695 offsetof(struct virtio_net_config, mac),
696 sc->vtnet_hwaddr, ETHER_ADDR_LEN);
697 }
698 }
699
700 static void
701 vtnet_get_hwaddr(struct vtnet_softc *sc)
702 {
703 device_t dev;
704
705 dev = sc->vtnet_dev;
706
707 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) {
708 /*
709 * Generate a random locally administered unicast address.
710 *
711 * It would be nice to generate the same MAC address across
712 * reboots, but it seems all the hosts currently available
713 * support the MAC feature, so this isn't too important.
714 */
715 sc->vtnet_hwaddr[0] = 0xB2;
716 karc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1);
717 return;
718 }
719
720 virtio_read_device_config(dev,
721 offsetof(struct virtio_net_config, mac),
722 sc->vtnet_hwaddr, ETHER_ADDR_LEN);
723 }
724
725 static int
726 vtnet_is_link_up(struct vtnet_softc *sc)
727 {
728 device_t dev;
729 struct ifnet *ifp;
730 uint16_t status;
731
732 dev = sc->vtnet_dev;
733 ifp = sc->vtnet_ifp;
734
735 ASSERT_SERIALIZED(&sc->vtnet_slz);
736
737 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) {
738 status = virtio_read_dev_config_2(dev,
739 offsetof(struct virtio_net_config, status));
740 } else {
741 status = VIRTIO_NET_S_LINK_UP;
742 }
743
744 return ((status & VIRTIO_NET_S_LINK_UP) != 0);
745 }
746
747 static void
748 vtnet_update_link_status(struct vtnet_softc *sc)
749 {
750 device_t dev;
751 struct ifnet *ifp;
752 struct ifaltq_subque *ifsq;
753 int link;
754
755 dev = sc->vtnet_dev;
756 ifp = sc->vtnet_ifp;
757 ifsq = ifq_get_subq_default(&ifp->if_snd);
758
759 link = vtnet_is_link_up(sc);
760
761 if (link && ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) {
762 sc->vtnet_flags |= VTNET_FLAG_LINK;
763 if (bootverbose)
764 device_printf(dev, "Link is up\n");
765 ifp->if_link_state = LINK_STATE_UP;
766 if_link_state_change(ifp);
767 if (!ifsq_is_empty(ifsq))
768 vtnet_start_locked(ifp, ifsq);
769 } else if (!link && (sc->vtnet_flags & VTNET_FLAG_LINK)) {
770 sc->vtnet_flags &= ~VTNET_FLAG_LINK;
771 if (bootverbose)
772 device_printf(dev, "Link is down\n");
773
774 ifp->if_link_state = LINK_STATE_DOWN;
775 if_link_state_change(ifp);
776 }
777 }
778
779 #if 0
780 static void
781 vtnet_watchdog(struct vtnet_softc *sc)
782 {
783 struct ifnet *ifp;
784
785 ifp = sc->vtnet_ifp;
786
787 #ifdef VTNET_TX_INTR_MODERATION
788 vtnet_txeof(sc);
789 #endif
790
791 if (sc->vtnet_watchdog_timer == 0 || --sc->vtnet_watchdog_timer)
792 return;
793
794 if_printf(ifp, "watchdog timeout -- resetting\n");
795 #ifdef VTNET_DEBUG
796 virtqueue_dump(sc->vtnet_tx_vq);
797 #endif
798 ifp->if_oerrors++;
799 ifp->if_flags &= ~IFF_RUNNING;
800 vtnet_init_locked(sc);
801 }
802 #endif
803
804 static void
805 vtnet_config_change_task(void *arg, int pending)
806 {
807 struct vtnet_softc *sc;
808
809 sc = arg;
810
811 lwkt_serialize_enter(&sc->vtnet_slz);
812 vtnet_update_link_status(sc);
813 lwkt_serialize_exit(&sc->vtnet_slz);
814 }
815
816 static int
817 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,struct ucred *cr)
818 {
819 struct vtnet_softc *sc;
820 struct ifreq *ifr;
821 int reinit, mask, error;
822
823 sc = ifp->if_softc;
824 ifr = (struct ifreq *) data;
825 reinit = 0;
826 error = 0;
827
828 switch (cmd) {
829 case SIOCSIFMTU:
830 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > VTNET_MAX_MTU)
831 error = EINVAL;
832 else if (ifp->if_mtu != ifr->ifr_mtu) {
833 lwkt_serialize_enter(&sc->vtnet_slz);
834 error = vtnet_change_mtu(sc, ifr->ifr_mtu);
835 lwkt_serialize_exit(&sc->vtnet_slz);
836 }
837 break;
838
839 case SIOCSIFFLAGS:
840 lwkt_serialize_enter(&sc->vtnet_slz);
841 if ((ifp->if_flags & IFF_UP) == 0) {
842 if (ifp->if_flags & IFF_RUNNING)
843 vtnet_stop(sc);
844 } else if (ifp->if_flags & IFF_RUNNING) {
845 if ((ifp->if_flags ^ sc->vtnet_if_flags) &
846 (IFF_PROMISC | IFF_ALLMULTI)) {
847 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
848 vtnet_rx_filter(sc);
849 else
850 error = ENOTSUP;
851 }
852 } else
853 vtnet_init_locked(sc);
854
855 if (error == 0)
856 sc->vtnet_if_flags = ifp->if_flags;
857 lwkt_serialize_exit(&sc->vtnet_slz);
858 break;
859
860 case SIOCADDMULTI:
861 case SIOCDELMULTI:
862 lwkt_serialize_enter(&sc->vtnet_slz);
863 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) &&
864 (ifp->if_flags & IFF_RUNNING))
865 vtnet_rx_filter_mac(sc);
866 lwkt_serialize_exit(&sc->vtnet_slz);
867 break;
868
869 case SIOCSIFMEDIA:
870 case SIOCGIFMEDIA:
871 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd);
872 break;
873
874 case SIOCSIFCAP:
875 mask = ifr->ifr_reqcap ^ ifp->if_capenable;
876
877 lwkt_serialize_enter(&sc->vtnet_slz);
878
879 if (mask & IFCAP_TXCSUM) {
880 ifp->if_capenable ^= IFCAP_TXCSUM;
881 if (ifp->if_capenable & IFCAP_TXCSUM)
882 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD;
883 else
884 ifp->if_hwassist &= ~VTNET_CSUM_OFFLOAD;
885 }
886
887 if (mask & IFCAP_TSO4) {
888 ifp->if_capenable ^= IFCAP_TSO4;
889 if (ifp->if_capenable & IFCAP_TSO4)
890 ifp->if_hwassist |= CSUM_TSO;
891 else
892 ifp->if_hwassist &= ~CSUM_TSO;
893 }
894
895 if (mask & IFCAP_RXCSUM) {
896 ifp->if_capenable ^= IFCAP_RXCSUM;
897 reinit = 1;
898 }
899
900 if (mask & IFCAP_LRO) {
901 ifp->if_capenable ^= IFCAP_LRO;
902 reinit = 1;
903 }
904
905 if (mask & IFCAP_VLAN_HWFILTER) {
906 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER;
907 reinit = 1;
908 }
909
910 if (mask & IFCAP_VLAN_HWTSO)
911 ifp->if_capenable ^= IFCAP_VLAN_HWTSO;
912
913 if (mask & IFCAP_VLAN_HWTAGGING)
914 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING;
915
916 if (reinit && (ifp->if_flags & IFF_RUNNING)) {
917 ifp->if_flags &= ~IFF_RUNNING;
918 vtnet_init_locked(sc);
919 }
920 //VLAN_CAPABILITIES(ifp);
921
922 lwkt_serialize_exit(&sc->vtnet_slz);
923 break;
924
925 default:
926 error = ether_ioctl(ifp, cmd, data);
927 break;
928 }
929
930 return (error);
931 }
932
933 static int
934 vtnet_change_mtu(struct vtnet_softc *sc, int new_mtu)
935 {
936 struct ifnet *ifp;
937 int new_frame_size, clsize;
938
939 ifp = sc->vtnet_ifp;
940
941 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
942 new_frame_size = sizeof(struct vtnet_rx_header) +
943 sizeof(struct ether_vlan_header) + new_mtu;
944
945 if (new_frame_size > MJUM9BYTES)
946 return (EINVAL);
947
948 if (new_frame_size <= MCLBYTES)
949 clsize = MCLBYTES;
950 else
951 clsize = MJUM9BYTES;
952 } else {
953 new_frame_size = sizeof(struct virtio_net_hdr_mrg_rxbuf) +
954 sizeof(struct ether_vlan_header) + new_mtu;
955
956 if (new_frame_size <= MCLBYTES)
957 clsize = MCLBYTES;
958 else
959 clsize = MJUMPAGESIZE;
960 }
961
962 sc->vtnet_rx_mbuf_size = clsize;
963 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc);
964 KASSERT(sc->vtnet_rx_mbuf_count < VTNET_MAX_RX_SEGS,
965 ("too many rx mbufs: %d", sc->vtnet_rx_mbuf_count));
966
967 ifp->if_mtu = new_mtu;
968
969 if (ifp->if_flags & IFF_RUNNING) {
970 ifp->if_flags &= ~IFF_RUNNING;
971 vtnet_init_locked(sc);
972 }
973
974 return (0);
975 }
976
977 static int
978 vtnet_init_rx_vq(struct vtnet_softc *sc)
979 {
980 struct virtqueue *vq;
981 int nbufs, error;
982
983 vq = sc->vtnet_rx_vq;
984 nbufs = 0;
985 error = ENOSPC;
986
987 while (!virtqueue_full(vq)) {
988 if ((error = vtnet_newbuf(sc)) != 0)
989 break;
990 nbufs++;
991 }
992
993 if (nbufs > 0) {
994 virtqueue_notify(vq, &sc->vtnet_slz);
995
996 /*
997 * EMSGSIZE signifies the virtqueue did not have enough
998 * entries available to hold the last mbuf. This is not
999 * an error. We should not get ENOSPC since we check if
1000 * the virtqueue is full before attempting to add a
1001 * buffer.
1002 */
1003 if (error == EMSGSIZE)
1004 error = 0;
1005 }
1006
1007 return (error);
1008 }
1009
1010 static void
1011 vtnet_free_rx_mbufs(struct vtnet_softc *sc)
1012 {
1013 struct virtqueue *vq;
1014 struct mbuf *m;
1015 int last;
1016
1017 vq = sc->vtnet_rx_vq;
1018 last = 0;
1019
1020 while ((m = virtqueue_drain(vq, &last)) != NULL)
1021 m_freem(m);
1022
1023 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Rx Vq"));
1024 }
1025
1026 static void
1027 vtnet_free_tx_mbufs(struct vtnet_softc *sc)
1028 {
1029 struct virtqueue *vq;
1030 struct vtnet_tx_header *txhdr;
1031 int last;
1032
1033 vq = sc->vtnet_tx_vq;
1034 last = 0;
1035
1036 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) {
1037 m_freem(txhdr->vth_mbuf);
1038 vtnet_enqueue_txhdr(sc, txhdr);
1039 }
1040
1041 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Tx Vq"));
1042 }
1043
1044 static void
1045 vtnet_free_ctrl_vq(struct vtnet_softc *sc)
1046 {
1047 /*
1048 * The control virtqueue is only polled, therefore
1049 * it should already be empty.
1050 */
1051 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq),
1052 ("Ctrl Vq not empty"));
1053 }
1054
1055 static struct mbuf *
1056 vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
1057 {
1058 struct mbuf *m_head, *m_tail, *m;
1059 int i, clsize;
1060
1061 clsize = sc->vtnet_rx_mbuf_size;
1062
1063 /*use getcl instead of getjcl. see if_mxge.c comment line 2398*/
1064 //m_head = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, clsize);
1065 m_head = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR );
1066 if (m_head == NULL)
1067 goto fail;
1068
1069 m_head->m_len = clsize;
1070 m_tail = m_head;
1071
1072 if (nbufs > 1) {
1073 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1074 ("chained Rx mbuf requested without LRO_NOMRG"));
1075
1076 for (i = 0; i < nbufs - 1; i++) {
1077 //m = m_getjcl(M_DONTWAIT, MT_DATA, 0, clsize);
1078 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1079 if (m == NULL)
1080 goto fail;
1081
1082 m->m_len = clsize;
1083 m_tail->m_next = m;
1084 m_tail = m;
1085 }
1086 }
1087
1088 if (m_tailp != NULL)
1089 *m_tailp = m_tail;
1090
1091 return (m_head);
1092
1093 fail:
1094 sc->vtnet_stats.mbuf_alloc_failed++;
1095 m_freem(m_head);
1096
1097 return (NULL);
1098 }
1099
1100 static int
1101 vtnet_replace_rxbuf(struct vtnet_softc *sc, struct mbuf *m0, int len0)
1102 {
1103 struct mbuf *m, *m_prev;
1104 struct mbuf *m_new, *m_tail;
1105 int len, clsize, nreplace, error;
1106
1107 m = m0;
1108 m_prev = NULL;
1109 len = len0;
1110
1111 m_tail = NULL;
1112 clsize = sc->vtnet_rx_mbuf_size;
1113 nreplace = 0;
1114
1115 if (m->m_next != NULL)
1116 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1117 ("chained Rx mbuf without LRO_NOMRG"));
1118
1119 /*
1120 * Since LRO_NOMRG mbuf chains are so large, we want to avoid
1121 * allocating an entire chain for each received frame. When
1122 * the received frame's length is less than that of the chain,
1123 * the unused mbufs are reassigned to the new chain.
1124 */
1125 while (len > 0) {
1126 /*
1127 * Something is seriously wrong if we received
1128 * a frame larger than the mbuf chain. Drop it.
1129 */
1130 if (m == NULL) {
1131 sc->vtnet_stats.rx_frame_too_large++;
1132 return (EMSGSIZE);
1133 }
1134
1135 KASSERT(m->m_len == clsize,
1136 ("mbuf length not expected cluster size: %d",
1137 m->m_len));
1138
1139 m->m_len = MIN(m->m_len, len);
1140 len -= m->m_len;
1141
1142 m_prev = m;
1143 m = m->m_next;
1144 nreplace++;
1145 }
1146
1147 KASSERT(m_prev != NULL, ("m_prev == NULL"));
1148 KASSERT(nreplace <= sc->vtnet_rx_mbuf_count,
1149 ("too many replacement mbufs: %d/%d", nreplace,
1150 sc->vtnet_rx_mbuf_count));
1151
1152 m_new = vtnet_alloc_rxbuf(sc, nreplace, &m_tail);
1153 if (m_new == NULL) {
1154 m_prev->m_len = clsize;
1155 return (ENOBUFS);
1156 }
1157
1158 /*
1159 * Move unused mbufs, if any, from the original chain
1160 * onto the end of the new chain.
1161 */
1162 if (m_prev->m_next != NULL) {
1163 m_tail->m_next = m_prev->m_next;
1164 m_prev->m_next = NULL;
1165 }
1166
1167 error = vtnet_enqueue_rxbuf(sc, m_new);
1168 if (error) {
1169 /*
1170 * BAD! We could not enqueue the replacement mbuf chain. We
1171 * must restore the m0 chain to the original state if it was
1172 * modified so we can subsequently discard it.
1173 *
1174 * NOTE: The replacement is suppose to be an identical copy
1175 * to the one just dequeued so this is an unexpected error.
1176 */
1177 sc->vtnet_stats.rx_enq_replacement_failed++;
1178
1179 if (m_tail->m_next != NULL) {
1180 m_prev->m_next = m_tail->m_next;
1181 m_tail->m_next = NULL;
1182 }
1183
1184 m_prev->m_len = clsize;
1185 m_freem(m_new);
1186 }
1187
1188 return (error);
1189 }
1190
1191 static int
1192 vtnet_newbuf(struct vtnet_softc *sc)
1193 {
1194 struct mbuf *m;
1195 int error;
1196
1197 m = vtnet_alloc_rxbuf(sc, sc->vtnet_rx_mbuf_count, NULL);
1198 if (m == NULL)
1199 return (ENOBUFS);
1200
1201 error = vtnet_enqueue_rxbuf(sc, m);
1202 if (error)
1203 m_freem(m);
1204
1205 return (error);
1206 }
1207
1208 static void
1209 vtnet_discard_merged_rxbuf(struct vtnet_softc *sc, int nbufs)
1210 {
1211 struct virtqueue *vq;
1212 struct mbuf *m;
1213
1214 vq = sc->vtnet_rx_vq;
1215
1216 while (--nbufs > 0) {
1217 if ((m = virtqueue_dequeue(vq, NULL)) == NULL)
1218 break;
1219 vtnet_discard_rxbuf(sc, m);
1220 }
1221 }
1222
1223 static void
1224 vtnet_discard_rxbuf(struct vtnet_softc *sc, struct mbuf *m)
1225 {
1226 int error;
1227
1228 /*
1229 * Requeue the discarded mbuf. This should always be
1230 * successful since it was just dequeued.
1231 */
1232 error = vtnet_enqueue_rxbuf(sc, m);
1233 KASSERT(error == 0, ("cannot requeue discarded mbuf"));
1234 }
1235
1236 static int
1237 vtnet_enqueue_rxbuf(struct vtnet_softc *sc, struct mbuf *m)
1238 {
1239 struct sglist sg;
1240 struct sglist_seg segs[VTNET_MAX_RX_SEGS];
1241 struct vtnet_rx_header *rxhdr;
1242 struct virtio_net_hdr *hdr;
1243 uint8_t *mdata;
1244 int offset, error;
1245
1246 ASSERT_SERIALIZED(&sc->vtnet_slz);
1247 if ((sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0)
1248 KASSERT(m->m_next == NULL, ("chained Rx mbuf"));
1249
1250 sglist_init(&sg, sc->vtnet_rx_nsegs, segs);
1251
1252 mdata = mtod(m, uint8_t *);
1253 offset = 0;
1254
1255 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
1256 rxhdr = (struct vtnet_rx_header *) mdata;
1257 hdr = &rxhdr->vrh_hdr;
1258 offset += sizeof(struct vtnet_rx_header);
1259
1260 error = sglist_append(&sg, hdr, sc->vtnet_hdr_size);
1261 KASSERT(error == 0, ("cannot add header to sglist"));
1262 }
1263
1264 error = sglist_append(&sg, mdata + offset, m->m_len - offset);
1265 if (error)
1266 return (error);
1267
1268 if (m->m_next != NULL) {
1269 error = sglist_append_mbuf(&sg, m->m_next);
1270 if (error)
1271 return (error);
1272 }
1273
1274 return (virtqueue_enqueue(sc->vtnet_rx_vq, m, &sg, 0, sg.sg_nseg));
1275 }
1276
1277 static void
1278 vtnet_vlan_tag_remove(struct mbuf *m)
1279 {
1280 struct ether_vlan_header *evl;
1281
1282 evl = mtod(m, struct ether_vlan_header *);
1283
1284 m->m_pkthdr.ether_vlantag = ntohs(evl->evl_tag);
1285 m->m_flags |= M_VLANTAG;
1286
1287 /* Strip the 802.1Q header. */
1288 bcopy((char *) evl, (char *) evl + ETHER_VLAN_ENCAP_LEN,
1289 ETHER_HDR_LEN - ETHER_TYPE_LEN);
1290 m_adj(m, ETHER_VLAN_ENCAP_LEN);
1291 }
1292
1293 /*
1294 * Alternative method of doing receive checksum offloading. Rather
1295 * than parsing the received frame down to the IP header, use the
1296 * csum_offset to determine which CSUM_* flags are appropriate. We
1297 * can get by with doing this only because the checksum offsets are
1298 * unique for the things we care about.
1299 */
1300 static int
1301 vtnet_rx_csum(struct vtnet_softc *sc, struct mbuf *m,
1302 struct virtio_net_hdr *hdr)
1303 {
1304 struct ether_header *eh;
1305 struct ether_vlan_header *evh;
1306 struct udphdr *udp;
1307 int csum_len;
1308 uint16_t eth_type;
1309
1310 csum_len = hdr->csum_start + hdr->csum_offset;
1311
1312 if (csum_len < sizeof(struct ether_header) + sizeof(struct ip))
1313 return (1);
1314 if (m->m_len < csum_len)
1315 return (1);
1316
1317 eh = mtod(m, struct ether_header *);
1318 eth_type = ntohs(eh->ether_type);
1319 if (eth_type == ETHERTYPE_VLAN) {
1320 evh = mtod(m, struct ether_vlan_header *);
1321 eth_type = ntohs(evh->evl_proto);
1322 }
1323
1324 if (eth_type != ETHERTYPE_IP && eth_type != ETHERTYPE_IPV6) {
1325 sc->vtnet_stats.rx_csum_bad_ethtype++;
1326 return (1);
1327 }
1328
1329 /* Use the offset to determine the appropriate CSUM_* flags. */
1330 switch (hdr->csum_offset) {
1331 case offsetof(struct udphdr, uh_sum):
1332 if (m->m_len < hdr->csum_start + sizeof(struct udphdr))
1333 return (1);
1334 udp = (struct udphdr *)(mtod(m, uint8_t *) + hdr->csum_start);
1335 if (udp->uh_sum == 0)
1336 return (0);
1337
1338 /* FALLTHROUGH */
1339
1340 case offsetof(struct tcphdr, th_sum):
1341 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1342 m->m_pkthdr.csum_data = 0xFFFF;
1343 break;
1344
1345 default:
1346 sc->vtnet_stats.rx_csum_bad_offset++;
1347 return (1);
1348 }
1349
1350 sc->vtnet_stats.rx_csum_offloaded++;
1351
1352 return (0);
1353 }
1354
1355 static int
1356 vtnet_rxeof_merged(struct vtnet_softc *sc, struct mbuf *m_head, int nbufs)
1357 {
1358 struct ifnet *ifp;
1359 struct virtqueue *vq;
1360 struct mbuf *m, *m_tail;
1361 int len;
1362
1363 ifp = sc->vtnet_ifp;
1364 vq = sc->vtnet_rx_vq;
1365 m_tail = m_head;
1366
1367 while (--nbufs > 0) {
1368 m = virtqueue_dequeue(vq, &len);
1369 if (m == NULL) {
1370 ifp->if_ierrors++;
1371 goto fail;
1372 }
1373
1374 if (vtnet_newbuf(sc) != 0) {
1375 ifp->if_iqdrops++;
1376 vtnet_discard_rxbuf(sc, m);
1377 if (nbufs > 1)
1378 vtnet_discard_merged_rxbuf(sc, nbufs);
1379 goto fail;
1380 }
1381
1382 if (m->m_len < len)
1383 len = m->m_len;
1384
1385 m->m_len = len;
1386 m->m_flags &= ~M_PKTHDR;
1387
1388 m_head->m_pkthdr.len += len;
1389 m_tail->m_next = m;
1390 m_tail = m;
1391 }
1392
1393 return (0);
1394
1395 fail:
1396 sc->vtnet_stats.rx_mergeable_failed++;
1397 m_freem(m_head);
1398
1399 return (1);
1400 }
1401
1402 static int
1403 vtnet_rxeof(struct vtnet_softc *sc, int count, int *rx_npktsp)
1404 {
1405 struct virtio_net_hdr lhdr;
1406 struct ifnet *ifp;
1407 struct virtqueue *vq;
1408 struct mbuf *m;
1409 struct ether_header *eh;
1410 struct virtio_net_hdr *hdr;
1411 struct virtio_net_hdr_mrg_rxbuf *mhdr;
1412 int len, deq, nbufs, adjsz, rx_npkts;
1413
1414 ifp = sc->vtnet_ifp;
1415 vq = sc->vtnet_rx_vq;
1416 hdr = &lhdr;
1417 deq = 0;
1418 rx_npkts = 0;
1419
1420 ASSERT_SERIALIZED(&sc->vtnet_slz);
1421
1422 while (--count >= 0) {
1423 m = virtqueue_dequeue(vq, &len);
1424 if (m == NULL)
1425 break;
1426 deq++;
1427
1428 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) {
1429 ifp->if_ierrors++;
1430 vtnet_discard_rxbuf(sc, m);
1431 continue;
1432 }
1433
1434 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
1435 nbufs = 1;
1436 adjsz = sizeof(struct vtnet_rx_header);
1437 /*
1438 * Account for our pad between the header and
1439 * the actual start of the frame.
1440 */
1441 len += VTNET_RX_HEADER_PAD;
1442 } else {
1443 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *);
1444 nbufs = mhdr->num_buffers;
1445 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1446 }
1447
1448 if (vtnet_replace_rxbuf(sc, m, len) != 0) {
1449 ifp->if_iqdrops++;
1450 vtnet_discard_rxbuf(sc, m);
1451 if (nbufs > 1)
1452 vtnet_discard_merged_rxbuf(sc, nbufs);
1453 continue;
1454 }
1455
1456 m->m_pkthdr.len = len;
1457 m->m_pkthdr.rcvif = ifp;
1458 m->m_pkthdr.csum_flags = 0;
1459
1460 if (nbufs > 1) {
1461 if (vtnet_rxeof_merged(sc, m, nbufs) != 0)
1462 continue;
1463 }
1464
1465 ifp->if_ipackets++;
1466
1467 /*
1468 * Save copy of header before we strip it. For both mergeable
1469 * and non-mergeable, the VirtIO header is placed first in the
1470 * mbuf's data. We no longer need num_buffers, so always use a
1471 * virtio_net_hdr.
1472 */
1473 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr));
1474 m_adj(m, adjsz);
1475
1476 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) {
1477 eh = mtod(m, struct ether_header *);
1478 if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
1479 vtnet_vlan_tag_remove(m);
1480
1481 /*
1482 * With the 802.1Q header removed, update the
1483 * checksum starting location accordingly.
1484 */
1485 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
1486 hdr->csum_start -=
1487 ETHER_VLAN_ENCAP_LEN;
1488 }
1489 }
1490
1491 if (ifp->if_capenable & IFCAP_RXCSUM &&
1492 hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1493 if (vtnet_rx_csum(sc, m, hdr) != 0)
1494 sc->vtnet_stats.rx_csum_failed++;
1495 }
1496
1497 lwkt_serialize_exit(&sc->vtnet_slz);
1498 rx_npkts++;
1499 ifp->if_input(ifp, m, NULL, -1);
1500 lwkt_serialize_enter(&sc->vtnet_slz);
1501
1502 /*
1503 * The interface may have been stopped while we were
1504 * passing the packet up the network stack.
1505 */
1506 if ((ifp->if_flags & IFF_RUNNING) == 0)
1507 break;
1508 }
1509
1510 virtqueue_notify(vq, &sc->vtnet_slz);
1511
1512 if (rx_npktsp != NULL)
1513 *rx_npktsp = rx_npkts;
1514
1515 return (count > 0 ? 0 : EAGAIN);
1516 }
1517
1518 static void
1519 vtnet_rx_intr_task(void *arg)
1520 {
1521 struct vtnet_softc *sc;
1522 struct ifnet *ifp;
1523 int more;
1524
1525 sc = arg;
1526 ifp = sc->vtnet_ifp;
1527
1528 next:
1529 // lwkt_serialize_enter(&sc->vtnet_slz);
1530
1531 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1532 vtnet_enable_rx_intr(sc);
1533 // lwkt_serialize_exit(&sc->vtnet_slz);
1534 return;
1535 }
1536
1537 more = vtnet_rxeof(sc, sc->vtnet_rx_process_limit, NULL);
1538 if (!more && vtnet_enable_rx_intr(sc) != 0) {
1539 vtnet_disable_rx_intr(sc);
1540 more = 1;
1541 }
1542
1543 // lwkt_serialize_exit(&sc->vtnet_slz);
1544
1545 if (more) {
1546 sc->vtnet_stats.rx_task_rescheduled++;
1547 goto next;
1548 }
1549 }
1550
1551 static int
1552 vtnet_rx_vq_intr(void *xsc)
1553 {
1554 struct vtnet_softc *sc;
1555
1556 sc = xsc;
1557
1558 vtnet_disable_rx_intr(sc);
1559 vtnet_rx_intr_task(sc);
1560
1561 return (1);
1562 }
1563
1564 static void
1565 vtnet_enqueue_txhdr(struct vtnet_softc *sc, struct vtnet_tx_header *txhdr)
1566 {
1567 bzero(txhdr, sizeof(*txhdr));
1568 SLIST_INSERT_HEAD(&sc->vtnet_txhdr_free, txhdr, link);
1569 }
1570
1571 static void
1572 vtnet_txeof(struct vtnet_softc *sc)
1573 {
1574 struct virtqueue *vq;
1575 struct ifnet *ifp;
1576 struct vtnet_tx_header *txhdr;
1577 int deq;
1578
1579 vq = sc->vtnet_tx_vq;
1580 ifp = sc->vtnet_ifp;
1581 deq = 0;
1582
1583 ASSERT_SERIALIZED(&sc->vtnet_slz);
1584
1585 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) {
1586 deq++;
1587 ifp->if_opackets++;
1588 m_freem(txhdr->vth_mbuf);
1589 vtnet_enqueue_txhdr(sc, txhdr);
1590 }
1591
1592 if (deq > 0) {
1593 ifq_clr_oactive(&ifp->if_snd);
1594 if (virtqueue_empty(vq))
1595 sc->vtnet_watchdog_timer = 0;
1596 }
1597 }
1598
1599 static struct mbuf *
1600 vtnet_tx_offload(struct vtnet_softc *sc, struct mbuf *m,
1601 struct virtio_net_hdr *hdr)
1602 {
1603 struct ifnet *ifp;
1604 struct ether_header *eh;
1605 struct ether_vlan_header *evh;
1606 struct ip *ip;
1607 struct ip6_hdr *ip6;
1608 struct tcphdr *tcp;
1609 int ip_offset;
1610 uint16_t eth_type, csum_start;
1611 uint8_t ip_proto, gso_type;
1612
1613 ifp = sc->vtnet_ifp;
1614 M_ASSERTPKTHDR(m);
1615
1616 ip_offset = sizeof(struct ether_header);
1617 if (m->m_len < ip_offset) {
1618 if ((m = m_pullup(m, ip_offset)) == NULL)
1619 return (NULL);
1620 }
1621
1622 eh = mtod(m, struct ether_header *);
1623 eth_type = ntohs(eh->ether_type);
1624 if (eth_type == ETHERTYPE_VLAN) {
1625 ip_offset = sizeof(struct ether_vlan_header);
1626 if (m->m_len < ip_offset) {
1627 if ((m = m_pullup(m, ip_offset)) == NULL)
1628 return (NULL);
1629 }
1630 evh = mtod(m, struct ether_vlan_header *);
1631 eth_type = ntohs(evh->evl_proto);
1632 }
1633
1634 switch (eth_type) {
1635 case ETHERTYPE_IP:
1636 if (m->m_len < ip_offset + sizeof(struct ip)) {
1637 m = m_pullup(m, ip_offset + sizeof(struct ip));
1638 if (m == NULL)
1639 return (NULL);
1640 }
1641
1642 ip = (struct ip *)(mtod(m, uint8_t *) + ip_offset);
1643 ip_proto = ip->ip_p;
1644 csum_start = ip_offset + (ip->ip_hl << 2);
1645 gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1646 break;
1647
1648 case ETHERTYPE_IPV6:
1649 if (m->m_len < ip_offset + sizeof(struct ip6_hdr)) {
1650 m = m_pullup(m, ip_offset + sizeof(struct ip6_hdr));
1651 if (m == NULL)
1652 return (NULL);
1653 }
1654
1655 ip6 = (struct ip6_hdr *)(mtod(m, uint8_t *) + ip_offset);
1656 /*
1657 * XXX Assume no extension headers are present. Presently,
1658 * this will always be true in the case of TSO, and FreeBSD
1659 * does not perform checksum offloading of IPv6 yet.
1660 */
1661 ip_proto = ip6->ip6_nxt;
1662 csum_start = ip_offset + sizeof(struct ip6_hdr);
1663 gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1664 break;
1665
1666 default:
1667 return (m);
1668 }
1669
1670 if (m->m_pkthdr.csum_flags & VTNET_CSUM_OFFLOAD) {
1671 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
1672 hdr->csum_start = csum_start;
1673 hdr->csum_offset = m->m_pkthdr.csum_data;
1674
1675 sc->vtnet_stats.tx_csum_offloaded++;
1676 }
1677
1678 if (m->m_pkthdr.csum_flags & CSUM_TSO) {
1679 if (ip_proto != IPPROTO_TCP)
1680 return (m);
1681
1682 if (m->m_len < csum_start + sizeof(struct tcphdr)) {
1683 m = m_pullup(m, csum_start + sizeof(struct tcphdr));
1684 if (m == NULL)
1685 return (NULL);
1686 }
1687
1688 tcp = (struct tcphdr *)(mtod(m, uint8_t *) + csum_start);
1689 hdr->gso_type = gso_type;
1690 hdr->hdr_len = csum_start + (tcp->th_off << 2);
1691 hdr->gso_size = m->m_pkthdr.tso_segsz;
1692
1693 if (tcp->th_flags & TH_CWR) {
1694 /*
1695 * Drop if we did not negotiate VIRTIO_NET_F_HOST_ECN.
1696 * ECN support is only configurable globally with the
1697 * net.inet.tcp.ecn.enable sysctl knob.
1698 */
1699 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) {
1700 if_printf(ifp, "TSO with ECN not supported "
1701 "by host\n");
1702 m_freem(m);
1703 return (NULL);
1704 }
1705
1706 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1707 }
1708
1709 sc->vtnet_stats.tx_tso_offloaded++;
1710 }
1711
1712 return (m);
1713 }
1714
1715 static int
1716 vtnet_enqueue_txbuf(struct vtnet_softc *sc, struct mbuf **m_head,
1717 struct vtnet_tx_header *txhdr)
1718 {
1719 struct sglist sg;
1720 struct sglist_seg segs[VTNET_MAX_TX_SEGS];
1721 struct virtqueue *vq;
1722 struct mbuf *m;
1723 int error;
1724
1725 vq = sc->vtnet_tx_vq;
1726 m = *m_head;
1727
1728 sglist_init(&sg, sc->vtnet_tx_nsegs, segs);
1729 error = sglist_append(&sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size);
1730 KASSERT(error == 0 && sg.sg_nseg == 1,
1731 ("%s: error %d adding header to sglist", __func__, error));
1732
1733 error = sglist_append_mbuf(&sg, m);
1734 if (error) {
1735 m = m_defrag(m, M_NOWAIT);
1736 if (m == NULL)
1737 goto fail;
1738
1739 *m_head = m;
1740 sc->vtnet_stats.tx_defragged++;
1741
1742 error = sglist_append_mbuf(&sg, m);
1743 if (error)
1744 goto fail;
1745 }
1746
1747 txhdr->vth_mbuf = m;
1748 error = virtqueue_enqueue(vq, txhdr, &sg, sg.sg_nseg, 0);
1749
1750 return (error);
1751
1752 fail:
1753 sc->vtnet_stats.tx_defrag_failed++;
1754 m_freem(*m_head);
1755 *m_head = NULL;
1756
1757 return (ENOBUFS);
1758 }
1759
1760 static struct mbuf *
1761 vtnet_vlan_tag_insert(struct mbuf *m)
1762 {
1763 struct mbuf *n;
1764 struct ether_vlan_header *evl;
1765
1766 if (M_WRITABLE(m) == 0) {
1767 n = m_dup(m, M_NOWAIT);
1768 m_freem(m);
1769 if ((m = n) == NULL)
1770 return (NULL);
1771 }
1772
1773 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1774 if (m == NULL)
1775 return (NULL);
1776 if (m->m_len < sizeof(struct ether_vlan_header)) {
1777 m = m_pullup(m, sizeof(struct ether_vlan_header));
1778 if (m == NULL)
1779 return (NULL);
1780 }
1781
1782 /* Insert 802.1Q header into the existing Ethernet header. */
1783 evl = mtod(m, struct ether_vlan_header *);
1784 bcopy((char *) evl + ETHER_VLAN_ENCAP_LEN,
1785 (char *) evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1786 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1787 evl->evl_tag = htons(m->m_pkthdr.ether_vlantag);
1788 m->m_flags &= ~M_VLANTAG;
1789
1790 return (m);
1791 }
1792
1793 static int
1794 vtnet_encap(struct vtnet_softc *sc, struct mbuf **m_head)
1795 {
1796 struct vtnet_tx_header *txhdr;
1797 struct virtio_net_hdr *hdr;
1798 struct mbuf *m;
1799 int error;
1800
1801 txhdr = SLIST_FIRST(&sc->vtnet_txhdr_free);
1802 if (txhdr == NULL)
1803 return (ENOBUFS);
1804 SLIST_REMOVE_HEAD(&sc->vtnet_txhdr_free, link);
1805
1806 /*
1807 * Always use the non-mergeable header to simplify things. When
1808 * the mergeable feature is negotiated, the num_buffers field
1809 * must be set to zero. We use vtnet_hdr_size later to enqueue
1810 * the correct header size to the host.
1811 */
1812 hdr = &txhdr->vth_uhdr.hdr;
1813 m = *m_head;
1814
1815 error = ENOBUFS;
1816
1817 if (m->m_flags & M_VLANTAG) {
1818 //m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1819 m = vtnet_vlan_tag_insert(m);
1820 if ((*m_head = m) == NULL)
1821 goto fail;
1822 m->m_flags &= ~M_VLANTAG;
1823 }
1824
1825 if (m->m_pkthdr.csum_flags != 0) {
1826 m = vtnet_tx_offload(sc, m, hdr);
1827 if ((*m_head = m) == NULL)
1828 goto fail;
1829 }
1830
1831 error = vtnet_enqueue_txbuf(sc, m_head, txhdr);
1832 fail:
1833 if (error != 0)
1834 vtnet_enqueue_txhdr(sc, txhdr);
1835 return (error);
1836 }
1837
1838 static void
1839 vtnet_start(struct ifnet *ifp, struct ifaltq_subque *ifsq)
1840 {
1841 struct vtnet_softc *sc;
1842
1843 sc = ifp->if_softc;
1844
1845 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
1846 lwkt_serialize_enter(&sc->vtnet_slz);
1847 vtnet_start_locked(ifp, ifsq);
1848 lwkt_serialize_exit(&sc->vtnet_slz);
1849 }
1850
1851 static void
1852 vtnet_start_locked(struct ifnet *ifp, struct ifaltq_subque *ifsq)
1853 {
1854 struct vtnet_softc *sc;
1855 struct virtqueue *vq;
1856 struct mbuf *m0;
1857 int enq;
1858
1859 sc = ifp->if_softc;
1860 vq = sc->vtnet_tx_vq;
1861 enq = 0;
1862
1863 ASSERT_SERIALIZED(&sc->vtnet_slz);
1864
1865 if ((ifp->if_flags & (IFF_RUNNING)) !=
1866 IFF_RUNNING || ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0))
1867 return;
1868
1869 #ifdef VTNET_TX_INTR_MODERATION
1870 if (virtqueue_nused(vq) >= sc->vtnet_tx_size / 2)
1871 vtnet_txeof(sc);
1872 #endif
1873
1874 while (!ifsq_is_empty(ifsq)) {
1875 if (virtqueue_full(vq)) {
1876 ifq_set_oactive(&ifp->if_snd);
1877 break;
1878 }
1879
1880 m0 = ifq_dequeue(&ifp->if_snd);
1881 if (m0 == NULL)
1882 break;
1883
1884 if (vtnet_encap(sc, &m0) != 0) {
1885 if (m0 == NULL)
1886 break;
1887 ifq_prepend(&ifp->if_snd, m0);
1888 ifq_set_oactive(&ifp->if_snd);
1889 break;
1890 }
1891
1892 enq++;
1893 ETHER_BPF_MTAP(ifp, m0);
1894 }
1895
1896 if (enq > 0) {
1897 virtqueue_notify(vq, &sc->vtnet_slz);
1898 sc->vtnet_watchdog_timer = VTNET_WATCHDOG_TIMEOUT;
1899 }
1900 }
1901
1902 static void
1903 vtnet_tick(void *xsc)
1904 {
1905 struct vtnet_softc *sc;
1906
1907 sc = xsc;
1908
1909 #if 0
1910 ASSERT_SERIALIZED(&sc->vtnet_slz);
1911 #ifdef VTNET_DEBUG
1912 virtqueue_dump(sc->vtnet_rx_vq);
1913 virtqueue_dump(sc->vtnet_tx_vq);
1914 #endif
1915
1916 vtnet_watchdog(sc);
1917 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
1918 #endif
1919 }
1920
1921 static void
1922 vtnet_tx_intr_task(void *arg)
1923 {
1924 struct vtnet_softc *sc;
1925 struct ifnet *ifp;
1926 struct ifaltq_subque *ifsq;
1927
1928 sc = arg;
1929 ifp = sc->vtnet_ifp;
1930 ifsq = ifq_get_subq_default(&ifp->if_snd);
1931
1932 next:
1933 // lwkt_serialize_enter(&sc->vtnet_slz);
1934
1935 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1936 vtnet_enable_tx_intr(sc);
1937 // lwkt_serialize_exit(&sc->vtnet_slz);
1938 return;
1939 }
1940
1941 vtnet_txeof(sc);
1942
1943 if (!ifsq_is_empty(ifsq))
1944 vtnet_start_locked(ifp, ifsq);
1945
1946 if (vtnet_enable_tx_intr(sc) != 0) {
1947 vtnet_disable_tx_intr(sc);
1948 sc->vtnet_stats.tx_task_rescheduled++;
1949 // lwkt_serialize_exit(&sc->vtnet_slz);
1950 goto next;
1951 }
1952
1953 // lwkt_serialize_exit(&sc->vtnet_slz);
1954 }
1955
1956 static int
1957 vtnet_tx_vq_intr(void *xsc)
1958 {
1959 struct vtnet_softc *sc;
1960
1961 sc = xsc;
1962
1963 vtnet_disable_tx_intr(sc);
1964 vtnet_tx_intr_task(sc);
1965
1966 return (1);
1967 }
1968
1969 static void
1970 vtnet_stop(struct vtnet_softc *sc)
1971 {
1972 device_t dev;
1973 struct ifnet *ifp;
1974
1975 dev = sc->vtnet_dev;
1976 ifp = sc->vtnet_ifp;
1977
1978 ASSERT_SERIALIZED(&sc->vtnet_slz);
1979
1980 sc->vtnet_watchdog_timer = 0;
1981 callout_stop(&sc->vtnet_tick_ch);
1982 ifq_clr_oactive(&ifp->if_snd);
1983 ifp->if_flags &= ~(IFF_RUNNING);
1984
1985 vtnet_disable_rx_intr(sc);
1986 vtnet_disable_tx_intr(sc);
1987
1988 /*
1989 * Stop the host VirtIO adapter. Note this will reset the host
1990 * adapter's state back to the pre-initialized state, so in
1991 * order to make the device usable again, we must drive it
1992 * through virtio_reinit() and virtio_reinit_complete().
1993 */
1994 virtio_stop(dev);
1995
1996 sc->vtnet_flags &= ~VTNET_FLAG_LINK;
1997
1998 vtnet_free_rx_mbufs(sc);
1999 vtnet_free_tx_mbufs(sc);
2000 }
2001
2002 static int
2003 vtnet_virtio_reinit(struct vtnet_softc *sc)
2004 {
2005 device_t dev;
2006 struct ifnet *ifp;
2007 uint64_t features;
2008 int error;
2009
2010 dev = sc->vtnet_dev;
2011 ifp = sc->vtnet_ifp;
2012 features = sc->vtnet_features;
2013
2014 /*
2015 * Re-negotiate with the host, removing any disabled receive
2016 * features. Transmit features are disabled only on our side
2017 * via if_capenable and if_hwassist.
2018 */
2019
2020 if (ifp->if_capabilities & IFCAP_RXCSUM) {
2021 if ((ifp->if_capenable & IFCAP_RXCSUM) == 0)
2022 features &= ~VIRTIO_NET_F_GUEST_CSUM;
2023 }
2024
2025 if (ifp->if_capabilities & IFCAP_LRO) {
2026 if ((ifp->if_capenable & IFCAP_LRO) == 0)
2027 features &= ~VTNET_LRO_FEATURES;
2028 }
2029
2030 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) {
2031 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0)
2032 features &= ~VIRTIO_NET_F_CTRL_VLAN;
2033 }
2034
2035 error = virtio_reinit(dev, features);
2036 if (error)
2037 device_printf(dev, "virtio reinit error %d\n", error);
2038
2039 return (error);
2040 }
2041
2042 static void
2043 vtnet_init_locked(struct vtnet_softc *sc)
2044 {
2045 device_t dev;
2046 struct ifnet *ifp;
2047 int error;
2048
2049 dev = sc->vtnet_dev;
2050 ifp = sc->vtnet_ifp;
2051
2052 ASSERT_SERIALIZED(&sc->vtnet_slz);
2053
2054 if (ifp->if_flags & IFF_RUNNING)
2055 return;
2056
2057 /* Stop host's adapter, cancel any pending I/O. */
2058 vtnet_stop(sc);
2059
2060 /* Reinitialize the host device. */
2061 error = vtnet_virtio_reinit(sc);
2062 if (error) {
2063 device_printf(dev,
2064 "reinitialization failed, stopping device...\n");
2065 vtnet_stop(sc);
2066 return;
2067 }
2068
2069 /* Update host with assigned MAC address. */
2070 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN);
2071 vtnet_set_hwaddr(sc);
2072
2073 ifp->if_hwassist = 0;
2074 if (ifp->if_capenable & IFCAP_TXCSUM)
2075 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD;
2076 if (ifp->if_capenable & IFCAP_TSO4)
2077 ifp->if_hwassist |= CSUM_TSO;
2078
2079 error = vtnet_init_rx_vq(sc);
2080 if (error) {
2081 device_printf(dev,
2082 "cannot allocate mbufs for Rx virtqueue\n");
2083 vtnet_stop(sc);
2084 return;
2085 }
2086
2087 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
2088 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
2089 /* Restore promiscuous and all-multicast modes. */
2090 vtnet_rx_filter(sc);
2091
2092 /* Restore filtered MAC addresses. */
2093 vtnet_rx_filter_mac(sc);
2094 }
2095
2096 /* Restore VLAN filters. */
2097 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER)
2098 vtnet_rx_filter_vlan(sc);
2099 }
2100
2101 {
2102 vtnet_enable_rx_intr(sc);
2103 vtnet_enable_tx_intr(sc);
2104 }
2105
2106 ifp->if_flags |= IFF_RUNNING;
2107 ifq_clr_oactive(&ifp->if_snd);
2108
2109 virtio_reinit_complete(dev);
2110
2111 vtnet_update_link_status(sc);
2112 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
2113 }
2114
2115 static void
2116 vtnet_init(void *xsc)
2117 {
2118 struct vtnet_softc *sc;
2119
2120 sc = xsc;
2121
2122 lwkt_serialize_enter(&sc->vtnet_slz);
2123 vtnet_init_locked(sc);
2124 lwkt_serialize_exit(&sc->vtnet_slz);
2125 }
2126
2127 static void
2128 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie,
2129 struct sglist *sg, int readable, int writable)
2130 {
2131 struct virtqueue *vq;
2132 void *c;
2133
2134 vq = sc->vtnet_ctrl_vq;
2135
2136 ASSERT_SERIALIZED(&sc->vtnet_slz);
2137 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ,
2138 ("no control virtqueue"));
2139 KASSERT(virtqueue_empty(vq),
2140 ("control command already enqueued"));
2141
2142 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0)
2143 return;
2144
2145 virtqueue_notify(vq, &sc->vtnet_slz);
2146
2147 /*
2148 * Poll until the command is complete. Previously, we would
2149 * sleep until the control virtqueue interrupt handler woke
2150 * us up, but dropping the VTNET_MTX leads to serialization
2151 * difficulties.
2152 *
2153 * Furthermore, it appears QEMU/KVM only allocates three MSIX
2154 * vectors. Two of those vectors are needed for the Rx and Tx
2155 * virtqueues. We do not support sharing both a Vq and config
2156 * changed notification on the same MSIX vector.
2157 */
2158 c = virtqueue_poll(vq, NULL);
2159 KASSERT(c == cookie, ("unexpected control command response"));
2160 }
2161
2162 static int
2163 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr)
2164 {
2165 struct {
2166 struct virtio_net_ctrl_hdr hdr __aligned(2);
2167 uint8_t pad1;
2168 char aligned_hwaddr[ETHER_ADDR_LEN] __aligned(8);
2169 uint8_t pad2;
2170 uint8_t ack;
2171 } s;
2172 struct sglist_seg segs[3];
2173 struct sglist sg;
2174 int error;
2175
2176 s.hdr.class = VIRTIO_NET_CTRL_MAC;
2177 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
2178 s.ack = VIRTIO_NET_ERR;
2179
2180 /* Copy the mac address into physically contiguous memory */
2181 memcpy(s.aligned_hwaddr, hwaddr, ETHER_ADDR_LEN);
2182
2183 sglist_init(&sg, 3, segs);
2184 error = 0;
2185 error |= sglist_append(&sg, &s.hdr,
2186 sizeof(struct virtio_net_ctrl_hdr));
2187 error |= sglist_append(&sg, s.aligned_hwaddr, ETHER_ADDR_LEN);
2188 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
2189 KASSERT(error == 0 && sg.sg_nseg == 3,
2190 ("%s: error %d adding set MAC msg to sglist", __func__, error));
2191
2192 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
2193
2194 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
2195 }
2196
2197 static void
2198 vtnet_rx_filter(struct vtnet_softc *sc)
2199 {
2200 device_t dev;
2201 struct ifnet *ifp;
2202
2203 dev = sc->vtnet_dev;
2204 ifp = sc->vtnet_ifp;
2205
2206 ASSERT_SERIALIZED(&sc->vtnet_slz);
2207 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
2208 ("CTRL_RX feature not negotiated"));
2209
2210 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0)
2211 device_printf(dev, "cannot %s promiscuous mode\n",
2212 (ifp->if_flags & IFF_PROMISC) ? "enable" : "disable");
2213
2214 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0)
2215 device_printf(dev, "cannot %s all-multicast mode\n",
2216 (ifp->if_flags & IFF_ALLMULTI) ? "enable" : "disable");
2217 }
2218
2219 static int
2220 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on)
2221 {
2222 struct sglist_seg segs[3];
2223 struct sglist sg;
2224 struct {
2225 struct virtio_net_ctrl_hdr hdr __aligned(2);
2226 uint8_t pad1;
2227 uint8_t onoff;
2228 uint8_t pad2;
2229 uint8_t ack;
2230 } s;
2231 int error;
2232
2233 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
2234 ("%s: CTRL_RX feature not negotiated", __func__));
2235
2236 s.hdr.class = VIRTIO_NET_CTRL_RX;
2237 s.hdr.cmd = cmd;
2238 s.onoff = !!on;
2239 s.ack = VIRTIO_NET_ERR;
2240
2241 sglist_init(&sg, 3, segs);
2242 error = 0;
2243 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
2244 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t));
2245 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
2246 KASSERT(error == 0 && sg.sg_nseg == 3,
2247 ("%s: error %d adding Rx message to sglist", __func__, error));
2248
2249 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
2250
2251 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
2252 }
2253
2254 static int
2255 vtnet_set_promisc(struct vtnet_softc *sc, int on)
2256 {
2257
2258 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on));
2259 }
2260
2261 static int
2262 vtnet_set_allmulti(struct vtnet_softc *sc, int on)
2263 {
2264
2265 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on));
2266 }
2267
2268 static void
2269 vtnet_rx_filter_mac(struct vtnet_softc *sc)
2270 {
2271 struct virtio_net_ctrl_hdr hdr __aligned(2);
2272 struct vtnet_mac_filter *filter;
2273 struct sglist_seg segs[4];
2274 struct sglist sg;
2275 struct ifnet *ifp;
2276 struct ifaddr *ifa;
2277 struct ifaddr_container *ifac;
2278 struct ifmultiaddr *ifma;
2279 int ucnt, mcnt, promisc, allmulti, error;
2280 uint8_t ack;
2281
2282 ifp = sc->vtnet_ifp;
2283 ucnt = 0;
2284 mcnt = 0;
2285 promisc = 0;
2286 allmulti = 0;
2287
2288 ASSERT_SERIALIZED(&sc->vtnet_slz);
2289 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
2290 ("%s: CTRL_RX feature not negotiated", __func__));
2291
2292 /* Use the MAC filtering table allocated in vtnet_attach. */
2293 filter = sc->vtnet_macfilter;
2294 memset(filter, 0, sizeof(struct vtnet_mac_filter));
2295
2296 /* Unicast MAC addresses: */
2297 //if_addr_rlock(ifp);
2298 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2299 ifa = ifac->ifa;
2300 if (ifa->ifa_addr->sa_family != AF_LINK)
2301 continue;
2302 else if (memcmp(LLADDR((struct sockaddr_dl *)ifa->ifa_addr),
2303 sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0)
2304 continue;
2305 else if (ucnt == VTNET_MAX_MAC_ENTRIES) {
2306 promisc = 1;
2307 break;
2308 }
2309
2310 bcopy(LLADDR((struct sockaddr_dl *)ifa->ifa_addr),
2311 &filter->vmf_unicast.macs[ucnt], ETHER_ADDR_LEN);
2312 ucnt++;
2313 }
2314 //if_addr_runlock(ifp);
2315
2316 if (promisc != 0) {
2317 filter->vmf_unicast.nentries = 0;
2318 if_printf(ifp, "more than %d MAC addresses assigned, "
2319 "falling back to promiscuous mode\n",
2320 VTNET_MAX_MAC_ENTRIES);
2321 } else
2322 filter->vmf_unicast.nentries = ucnt;
2323
2324 /* Multicast MAC addresses: */
2325 //if_maddr_rlock(ifp);
2326 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2327 if (ifma->ifma_addr->sa_family != AF_LINK)
2328 continue;
2329 else if (mcnt == VTNET_MAX_MAC_ENTRIES) {
2330 allmulti = 1;
2331 break;
2332 }
2333
2334 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
2335 &filter->vmf_multicast.macs[mcnt], ETHER_ADDR_LEN);
2336 mcnt++;
2337 }
2338 //if_maddr_runlock(ifp);
2339
2340 if (allmulti != 0) {
2341 filter->vmf_multicast.nentries = 0;
2342 if_printf(ifp, "more than %d multicast MAC addresses "
2343 "assigned, falling back to all-multicast mode\n",
2344 VTNET_MAX_MAC_ENTRIES);
2345 } else
2346 filter->vmf_multicast.nentries = mcnt;
2347
2348 if (promisc != 0 && allmulti != 0)
2349 goto out;
2350
2351 hdr.class = VIRTIO_NET_CTRL_MAC;
2352 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
2353 ack = VIRTIO_NET_ERR;
2354
2355 sglist_init(&sg, 4, segs);
2356 error = 0;
2357 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr));
2358 error |= sglist_append(&sg, &filter->vmf_unicast,
2359 sizeof(uint32_t) + filter->vmf_unicast.nentries * ETHER_ADDR_LEN);
2360 error |= sglist_append(&sg, &filter->vmf_multicast,
2361 sizeof(uint32_t) + filter->vmf_multicast.nentries * ETHER_ADDR_LEN);
2362 error |= sglist_append(&sg, &ack, sizeof(uint8_t));
2363 KASSERT(error == 0 && sg.sg_nseg == 4,
2364 ("%s: error %d adding MAC filter msg to sglist", __func__, error));
2365
2366 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1);
2367
2368 if (ack != VIRTIO_NET_OK)
2369 if_printf(ifp, "error setting host MAC filter table\n");
2370
2371 out:
2372 if (promisc != 0 && vtnet_set_promisc(sc, 1) != 0)
2373 if_printf(ifp, "cannot enable promiscuous mode\n");
2374 if (allmulti != 0 && vtnet_set_allmulti(sc, 1) != 0)
2375 if_printf(ifp, "cannot enable all-multicast mode\n");
2376 }
2377
2378 static int
2379 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
2380 {
2381 struct sglist_seg segs[3];
2382 struct sglist sg;
2383 struct {
2384 struct virtio_net_ctrl_hdr hdr __aligned(2);
2385 uint8_t pad1;
2386 uint16_t tag;
2387 uint8_t pad2;
2388 uint8_t ack;
2389 } s;
2390 int error;
2391
2392 s.hdr.class = VIRTIO_NET_CTRL_VLAN;
2393 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
2394 s.tag = tag;
2395 s.ack = VIRTIO_NET_ERR;
2396
2397 sglist_init(&sg, 3, segs);
2398 error = 0;
2399 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
2400 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t));
2401 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
2402 KASSERT(error == 0 && sg.sg_nseg == 3,
2403 ("%s: error %d adding VLAN message to sglist", __func__, error));
2404
2405 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
2406
2407 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
2408 }
2409
2410 static void
2411 vtnet_rx_filter_vlan(struct vtnet_softc *sc)
2412 {
2413 uint32_t w;
2414 uint16_t tag;
2415 int i, bit, nvlans;
2416
2417 ASSERT_SERIALIZED(&sc->vtnet_slz);
2418 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER,
2419 ("%s: VLAN_FILTER feature not negotiated", __func__));
2420
2421 nvlans = sc->vtnet_nvlans;
2422
2423 /* Enable the filter for each configured VLAN. */
2424 for (i = 0; i < VTNET_VLAN_SHADOW_SIZE && nvlans > 0; i++) {
2425 w = sc->vtnet_vlan_shadow[i];
2426 while ((bit = ffs(w) - 1) != -1) {
2427 w &= ~(1 << bit);
2428 tag = sizeof(w) * CHAR_BIT * i + bit;
2429 nvlans--;
2430
2431 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) {
2432 device_printf(sc->vtnet_dev,
2433 "cannot enable VLAN %d filter\n", tag);
2434 }
2435 }
2436 }
2437
2438 KASSERT(nvlans == 0, ("VLAN count incorrect"));
2439 }
2440
2441 static void
2442 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
2443 {
2444 struct ifnet *ifp;
2445 int idx, bit;
2446
2447 ifp = sc->vtnet_ifp;
2448 idx = (tag >> 5) & 0x7F;
2449 bit = tag & 0x1F;
2450
2451 if (tag == 0 || tag > 4095)
2452 return;
2453
2454 lwkt_serialize_enter(&sc->vtnet_slz);
2455
2456 /* Update shadow VLAN table. */
2457 if (add) {
2458 sc->vtnet_nvlans++;
2459 sc->vtnet_vlan_shadow[idx] |= (1 << bit);
2460 } else {
2461 sc->vtnet_nvlans--;
2462 sc->vtnet_vlan_shadow[idx] &= ~(1 << bit);
2463 }
2464
2465 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER &&
2466 vtnet_exec_vlan_filter(sc, add, tag) != 0) {
2467 device_printf(sc->vtnet_dev,
2468 "cannot %s VLAN %d %s the host filter table\n",
2469 add ? "add" : "remove", tag, add ? "to" : "from");
2470 }
2471
2472 lwkt_serialize_exit(&sc->vtnet_slz);
2473 }
2474
2475 static void
2476 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag)
2477 {
2478
2479 if (ifp->if_softc != arg)
2480 return;
2481
2482 vtnet_update_vlan_filter(arg, 1, tag);
2483 }
2484
2485 static void
2486 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag)
2487 {
2488
2489 if (ifp->if_softc != arg)
2490 return;
2491
2492 vtnet_update_vlan_filter(arg, 0, tag);
2493 }
2494
2495 static int
2496 vtnet_ifmedia_upd(struct ifnet *ifp)
2497 {
2498 struct vtnet_softc *sc;
2499 struct ifmedia *ifm;
2500
2501 sc = ifp->if_softc;
2502 ifm = &sc->vtnet_media;
2503
2504 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
2505 return (EINVAL);
2506
2507 return (0);
2508 }
2509
2510 static void
2511 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
2512 {
2513 struct vtnet_softc *sc;
2514
2515 sc = ifp->if_softc;
2516
2517 ifmr->ifm_status = IFM_AVALID;
2518 ifmr->ifm_active = IFM_ETHER;
2519
2520 lwkt_serialize_enter(&sc->vtnet_slz);
2521 if (vtnet_is_link_up(sc) != 0) {
2522 ifmr->ifm_status |= IFM_ACTIVE;
2523 ifmr->ifm_active |= VTNET_MEDIATYPE;
2524 } else
2525 ifmr->ifm_active |= IFM_NONE;
2526 lwkt_serialize_exit(&sc->vtnet_slz);
2527 }
2528
2529 static void
2530 vtnet_add_statistics(struct vtnet_softc *sc)
2531 {
2532 device_t dev;
2533 struct vtnet_statistics *stats;
2534 struct sysctl_ctx_list *ctx;
2535 struct sysctl_oid *tree;
2536 struct sysctl_oid_list *child;
2537
2538 dev = sc->vtnet_dev;
2539 stats = &sc->vtnet_stats;
2540 ctx = device_get_sysctl_ctx(dev);
2541 tree = device_get_sysctl_tree(dev);
2542 child = SYSCTL_CHILDREN(tree);
2543
2544 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed",
2545 CTLFLAG_RD, &stats->mbuf_alloc_failed, 0,
2546 "Mbuf cluster allocation failures");
2547
2548 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large",
2549 CTLFLAG_RD, &stats->rx_frame_too_large, 0,
2550 "Received frame larger than the mbuf chain");
2551 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed",
2552 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 0,
2553 "Enqueuing the replacement receive mbuf failed");
2554 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed",
2555 CTLFLAG_RD, &stats->rx_mergeable_failed, 0,
2556 "Mergeable buffers receive failures");
2557 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype",
2558 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 0,
2559 "Received checksum offloaded buffer with unsupported "
2560 "Ethernet type");
2561 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto",
2562 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 0,
2563 "Received checksum offloaded buffer with incorrect IP protocol");
2564 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset",
2565 CTLFLAG_RD, &stats->rx_csum_bad_offset, 0,
2566 "Received checksum offloaded buffer with incorrect offset");
2567 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed",
2568 CTLFLAG_RD, &stats->rx_csum_failed, 0,
2569 "Received buffer checksum offload failed");
2570 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded",
2571 CTLFLAG_RD, &stats->rx_csum_offloaded, 0,
2572 "Received buffer checksum offload succeeded");
2573 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled",
2574 CTLFLAG_RD, &stats->rx_task_rescheduled, 0,
2575 "Times the receive interrupt task rescheduled itself");
2576
2577 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_bad_ethtype",
2578 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 0,
2579 "Aborted transmit of checksum offloaded buffer with unknown "
2580 "Ethernet type");
2581 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_bad_ethtype",
2582 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 0,
2583 "Aborted transmit of TSO buffer with unknown Ethernet type");
2584 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged",
2585 CTLFLAG_RD, &stats->tx_defragged, 0,
2586 "Transmit mbufs defragged");
2587 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed",
2588 CTLFLAG_RD, &stats->tx_defrag_failed, 0,
2589 "Aborted transmit of buffer because defrag failed");
2590 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded",
2591 CTLFLAG_RD, &stats->tx_csum_offloaded, 0,
2592 "Offloaded checksum of transmitted buffer");
2593 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded",
2594 CTLFLAG_RD, &stats->tx_tso_offloaded, 0,
2595 "Segmentation offload of transmitted buffer");
2596 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled",
2597 CTLFLAG_RD, &stats->tx_task_rescheduled, 0,
2598 "Times the transmit interrupt task rescheduled itself");
2599 }
2600
2601 static int
2602 vtnet_enable_rx_intr(struct vtnet_softc *sc)
2603 {
2604
2605 return (virtqueue_enable_intr(sc->vtnet_rx_vq));
2606 }
2607
2608 static void
2609 vtnet_disable_rx_intr(struct vtnet_softc *sc)
2610 {
2611
2612 virtqueue_disable_intr(sc->vtnet_rx_vq);
2613 }
2614
2615 static int
2616 vtnet_enable_tx_intr(struct vtnet_softc *sc)
2617 {
2618
2619 #ifdef VTNET_TX_INTR_MODERATION
2620 return (0);
2621 #else
2622 return (virtqueue_enable_intr(sc->vtnet_tx_vq));
2623 #endif
2624 }
2625
2626 static void
2627 vtnet_disable_tx_intr(struct vtnet_softc *sc)
2628 {
2629
2630 virtqueue_disable_intr(sc->vtnet_tx_vq);
2631 }
DragonFly BSD