?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
if_vtnet - Add back vtnet_tx_size variable for now, to fix build.
[dragonfly.git] / sys / dev / virtual / virtio / net / if_vtnet.c
blob1e942aad2973bc371e58f0cd8071ff9b00c4d4dd
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 /*
326 * Device defaults to promiscuous mode for backwards
327 * compatibility. Turn it off if possible.
328 */
329 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
330 lwkt_serialize_enter(&sc->vtnet_slz);
331 if (vtnet_set_promisc(sc, 0) != 0) {
332 sc->vtnet_ifp->if_flags |= IFF_PROMISC;
333 device_printf(dev,
334 "cannot disable promiscuous mode\n");
335 }
336 lwkt_serialize_exit(&sc->vtnet_slz);
337 } else
338 sc->vtnet_ifp->if_flags |= IFF_PROMISC;
339
340 fail:
341 if (error)
342 vtnet_detach(dev);
343
344 return (error);
345 }
346
347 static int
348 vtnet_detach(device_t dev)
349 {
350 struct vtnet_softc *sc;
351 struct ifnet *ifp;
352
353 sc = device_get_softc(dev);
354 ifp = sc->vtnet_ifp;
355
356 if (device_is_attached(dev)) {
357 lwkt_serialize_enter(&sc->vtnet_slz);
358 vtnet_stop(sc);
359 lwkt_serialize_exit(&sc->vtnet_slz);
360
361 callout_stop(&sc->vtnet_tick_ch);
362 taskqueue_drain(taskqueue_swi, &sc->vtnet_cfgchg_task);
363
364 ether_ifdetach(ifp);
365 }
366
367 if (sc->vtnet_vlan_attach != NULL) {
368 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach);
369 sc->vtnet_vlan_attach = NULL;
370 }
371 if (sc->vtnet_vlan_detach != NULL) {
372 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach);
373 sc->vtnet_vlan_detach = NULL;
374 }
375
376 if (ifp) {
377 if_free(ifp);
378 sc->vtnet_ifp = NULL;
379 }
380
381 if (sc->vtnet_rx_vq != NULL)
382 vtnet_free_rx_mbufs(sc);
383 if (sc->vtnet_tx_vq != NULL)
384 vtnet_free_tx_mbufs(sc);
385 if (sc->vtnet_ctrl_vq != NULL)
386 vtnet_free_ctrl_vq(sc);
387
388 if (sc->vtnet_txhdrarea != NULL) {
389 contigfree(sc->vtnet_txhdrarea,
390 sc->vtnet_txhdrcount * sizeof(struct vtnet_tx_header),
391 M_VTNET);
392 sc->vtnet_txhdrarea = NULL;
393 }
394 SLIST_INIT(&sc->vtnet_txhdr_free);
395 if (sc->vtnet_macfilter != NULL) {
396 contigfree(sc->vtnet_macfilter,
397 sizeof(struct vtnet_mac_filter), M_DEVBUF);
398 sc->vtnet_macfilter = NULL;
399 }
400
401 ifmedia_removeall(&sc->vtnet_media);
402
403 return (0);
404 }
405
406 static int
407 vtnet_suspend(device_t dev)
408 {
409 struct vtnet_softc *sc;
410
411 sc = device_get_softc(dev);
412
413 lwkt_serialize_enter(&sc->vtnet_slz);
414 vtnet_stop(sc);
415 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED;
416 lwkt_serialize_exit(&sc->vtnet_slz);
417
418 return (0);
419 }
420
421 static int
422 vtnet_resume(device_t dev)
423 {
424 struct vtnet_softc *sc;
425 struct ifnet *ifp;
426
427 sc = device_get_softc(dev);
428 ifp = sc->vtnet_ifp;
429
430 lwkt_serialize_enter(&sc->vtnet_slz);
431 if (ifp->if_flags & IFF_UP)
432 vtnet_init_locked(sc);
433 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED;
434 lwkt_serialize_exit(&sc->vtnet_slz);
435
436 return (0);
437 }
438
439 static int
440 vtnet_shutdown(device_t dev)
441 {
442
443 /*
444 * Suspend already does all of what we need to
445 * do here; we just never expect to be resumed.
446 */
447 return (vtnet_suspend(dev));
448 }
449
450 static int
451 vtnet_config_change(device_t dev)
452 {
453 struct vtnet_softc *sc;
454
455 sc = device_get_softc(dev);
456
457 taskqueue_enqueue(taskqueue_thread[mycpuid], &sc->vtnet_cfgchg_task);
458
459 return (1);
460 }
461
462 static void
463 vtnet_negotiate_features(struct vtnet_softc *sc)
464 {
465 device_t dev;
466 uint64_t mask, features;
467
468 dev = sc->vtnet_dev;
469 mask = 0;
470
471 if (vtnet_csum_disable)
472 mask |= VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM;
473
474 /*
475 * TSO and LRO are only available when their corresponding checksum
476 * offload feature is also negotiated.
477 */
478
479 if (vtnet_csum_disable || vtnet_tso_disable)
480 mask |= VIRTIO_NET_F_HOST_TSO4 | VIRTIO_NET_F_HOST_TSO6 |
481 VIRTIO_NET_F_HOST_ECN;
482
483 if (vtnet_csum_disable || vtnet_lro_disable)
484 mask |= VTNET_LRO_FEATURES;
485
486 features = VTNET_FEATURES & ~mask;
487 features |= VIRTIO_F_NOTIFY_ON_EMPTY;
488 features |= VIRTIO_F_ANY_LAYOUT;
489 sc->vtnet_features = virtio_negotiate_features(dev, features);
490
491 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) &&
492 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) {
493 /*
494 * LRO without mergeable buffers requires special care. This
495 * is not ideal because every receive buffer must be large
496 * enough to hold the maximum TCP packet, the Ethernet header,
497 * and the header. This requires up to 34 descriptors with
498 * MCLBYTES clusters. If we do not have indirect descriptors,
499 * LRO is disabled since the virtqueue will not contain very
500 * many receive buffers.
501 */
502 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) {
503 device_printf(dev,
504 "LRO disabled due to both mergeable buffers and "
505 "indirect descriptors not negotiated\n");
506
507 features &= ~VTNET_LRO_FEATURES;
508 sc->vtnet_features =
509 virtio_negotiate_features(dev, features);
510 } else
511 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG;
512 }
513 }
514
515 static int
516 vtnet_alloc_virtqueues(struct vtnet_softc *sc)
517 {
518 device_t dev;
519 struct vq_alloc_info vq_info[3];
520 int nvqs;
521
522 dev = sc->vtnet_dev;
523 nvqs = 2;
524
525 /*
526 * Indirect descriptors are not needed for the Rx
527 * virtqueue when mergeable buffers are negotiated.
528 * The header is placed inline with the data, not
529 * in a separate descriptor, and mbuf clusters are
530 * always physically contiguous.
531 */
532 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
533 sc->vtnet_rx_nsegs = (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) ?
534 VTNET_MAX_RX_SEGS : VTNET_MIN_RX_SEGS;
535 } else
536 sc->vtnet_rx_nsegs = VTNET_MRG_RX_SEGS;
537
538 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) ||
539 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
540 sc->vtnet_tx_nsegs = VTNET_MAX_TX_SEGS;
541 else
542 sc->vtnet_tx_nsegs = VTNET_MIN_TX_SEGS;
543
544 VQ_ALLOC_INFO_INIT(&vq_info[0], sc->vtnet_rx_nsegs,
545 vtnet_rx_vq_intr, sc, &sc->vtnet_rx_vq,
546 "%s receive", device_get_nameunit(dev));
547
548 VQ_ALLOC_INFO_INIT(&vq_info[1], sc->vtnet_tx_nsegs,
549 vtnet_tx_vq_intr, sc, &sc->vtnet_tx_vq,
550 "%s transmit", device_get_nameunit(dev));
551
552 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
553 nvqs++;
554
555 VQ_ALLOC_INFO_INIT(&vq_info[2], 0, NULL, NULL,
556 &sc->vtnet_ctrl_vq, "%s control",
557 device_get_nameunit(dev));
558 }
559
560 return (virtio_alloc_virtqueues(dev, 0, nvqs, vq_info));
561 }
562
563 static int
564 vtnet_setup_interface(struct vtnet_softc *sc)
565 {
566 device_t dev;
567 struct ifnet *ifp;
568 int i;
569
570 dev = sc->vtnet_dev;
571
572 ifp = sc->vtnet_ifp = if_alloc(IFT_ETHER);
573 if (ifp == NULL) {
574 device_printf(dev, "cannot allocate ifnet structure\n");
575 return (ENOSPC);
576 }
577
578 ifp->if_softc = sc;
579 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
580 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
581 ifp->if_init = vtnet_init;
582 ifp->if_start = vtnet_start;
583 ifp->if_ioctl = vtnet_ioctl;
584
585 sc->vtnet_rx_process_limit = virtqueue_size(sc->vtnet_rx_vq);
586 sc->vtnet_tx_size = virtqueue_size(sc->vtnet_tx_vq);
587 if (sc->vtnet_flags & VTNET_FLAG_INDIRECT)
588 sc->vtnet_txhdrcount = sc->vtnet_tx_size;
589 else
590 sc->vtnet_txhdrcount = (sc->vtnet_tx_size / 2) + 1;
591 sc->vtnet_txhdrarea = contigmalloc(
592 sc->vtnet_txhdrcount * sizeof(struct vtnet_tx_header),
593 M_VTNET, M_WAITOK, 0, BUS_SPACE_MAXADDR, 4, 0);
594 if (sc->vtnet_txhdrarea == NULL) {
595 device_printf(dev, "cannot contigmalloc the tx headers\n");
596 return (ENOMEM);
597 }
598 for (i = 0; i < sc->vtnet_txhdrcount; i++)
599 vtnet_enqueue_txhdr(sc, &sc->vtnet_txhdrarea[i]);
600 sc->vtnet_macfilter = contigmalloc(
601 sizeof(struct vtnet_mac_filter),
602 M_DEVBUF, M_WAITOK, 0, BUS_SPACE_MAXADDR, 4, 0);
603 if (sc->vtnet_macfilter == NULL) {
604 device_printf(dev,
605 "cannot contigmalloc the mac filter table\n");
606 return (ENOMEM);
607 }
608 ifq_set_maxlen(&ifp->if_snd, sc->vtnet_tx_size - 1);
609 ifq_set_ready(&ifp->if_snd);
610
611 ether_ifattach(ifp, sc->vtnet_hwaddr, NULL);
612
613 /* Tell the upper layer(s) we support long frames. */
614 ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
615 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU;
616
617 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) {
618 ifp->if_capabilities |= IFCAP_TXCSUM;
619
620 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4))
621 ifp->if_capabilities |= IFCAP_TSO4;
622 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
623 ifp->if_capabilities |= IFCAP_TSO6;
624 if (ifp->if_capabilities & IFCAP_TSO)
625 ifp->if_capabilities |= IFCAP_VLAN_HWTSO;
626
627 if (virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN))
628 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN;
629 }
630
631 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) {
632 ifp->if_capabilities |= IFCAP_RXCSUM;
633
634 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) ||
635 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6))
636 ifp->if_capabilities |= IFCAP_LRO;
637 }
638
639 if (ifp->if_capabilities & IFCAP_HWCSUM) {
640 /*
641 * VirtIO does not support VLAN tagging, but we can fake
642 * it by inserting and removing the 802.1Q header during
643 * transmit and receive. We are then able to do checksum
644 * offloading of VLAN frames.
645 */
646 ifp->if_capabilities |=
647 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM;
648 }
649
650 ifp->if_capenable = ifp->if_capabilities;
651
652 /*
653 * Capabilities after here are not enabled by default.
654 */
655
656 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
657 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER;
658
659 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
660 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
661 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
662 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
663 }
664
665 return (0);
666 }
667
668 static void
669 vtnet_set_hwaddr(struct vtnet_softc *sc)
670 {
671 device_t dev;
672
673 dev = sc->vtnet_dev;
674
675 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) &&
676 (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)) {
677 if (vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr) != 0)
678 device_printf(dev, "unable to set MAC address\n");
679 } else if (sc->vtnet_flags & VTNET_FLAG_MAC) {
680 virtio_write_device_config(dev,
681 offsetof(struct virtio_net_config, mac),
682 sc->vtnet_hwaddr, ETHER_ADDR_LEN);
683 }
684 }
685
686 static void
687 vtnet_get_hwaddr(struct vtnet_softc *sc)
688 {
689 device_t dev;
690
691 dev = sc->vtnet_dev;
692
693 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0) {
694 /*
695 * Generate a random locally administered unicast address.
696 *
697 * It would be nice to generate the same MAC address across
698 * reboots, but it seems all the hosts currently available
699 * support the MAC feature, so this isn't too important.
700 */
701 sc->vtnet_hwaddr[0] = 0xB2;
702 karc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1);
703 vtnet_set_hwaddr(sc);
704 return;
705 }
706
707 virtio_read_device_config(dev,
708 offsetof(struct virtio_net_config, mac),
709 sc->vtnet_hwaddr, ETHER_ADDR_LEN);
710 }
711
712 static int
713 vtnet_is_link_up(struct vtnet_softc *sc)
714 {
715 device_t dev;
716 struct ifnet *ifp;
717 uint16_t status;
718
719 dev = sc->vtnet_dev;
720 ifp = sc->vtnet_ifp;
721
722 ASSERT_SERIALIZED(&sc->vtnet_slz);
723
724 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS)) {
725 status = virtio_read_dev_config_2(dev,
726 offsetof(struct virtio_net_config, status));
727 } else {
728 status = VIRTIO_NET_S_LINK_UP;
729 }
730
731 return ((status & VIRTIO_NET_S_LINK_UP) != 0);
732 }
733
734 static void
735 vtnet_update_link_status(struct vtnet_softc *sc)
736 {
737 device_t dev;
738 struct ifnet *ifp;
739 struct ifaltq_subque *ifsq;
740 int link;
741
742 dev = sc->vtnet_dev;
743 ifp = sc->vtnet_ifp;
744 ifsq = ifq_get_subq_default(&ifp->if_snd);
745
746 link = vtnet_is_link_up(sc);
747
748 if (link && ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0)) {
749 sc->vtnet_flags |= VTNET_FLAG_LINK;
750 if (bootverbose)
751 device_printf(dev, "Link is up\n");
752 ifp->if_link_state = LINK_STATE_UP;
753 if_link_state_change(ifp);
754 if (!ifsq_is_empty(ifsq))
755 vtnet_start_locked(ifp, ifsq);
756 } else if (!link && (sc->vtnet_flags & VTNET_FLAG_LINK)) {
757 sc->vtnet_flags &= ~VTNET_FLAG_LINK;
758 if (bootverbose)
759 device_printf(dev, "Link is down\n");
760
761 ifp->if_link_state = LINK_STATE_DOWN;
762 if_link_state_change(ifp);
763 }
764 }
765
766 #if 0
767 static void
768 vtnet_watchdog(struct vtnet_softc *sc)
769 {
770 struct ifnet *ifp;
771
772 ifp = sc->vtnet_ifp;
773
774 #ifdef VTNET_TX_INTR_MODERATION
775 vtnet_txeof(sc);
776 #endif
777
778 if (sc->vtnet_watchdog_timer == 0 || --sc->vtnet_watchdog_timer)
779 return;
780
781 if_printf(ifp, "watchdog timeout -- resetting\n");
782 #ifdef VTNET_DEBUG
783 virtqueue_dump(sc->vtnet_tx_vq);
784 #endif
785 ifp->if_oerrors++;
786 ifp->if_flags &= ~IFF_RUNNING;
787 vtnet_init_locked(sc);
788 }
789 #endif
790
791 static void
792 vtnet_config_change_task(void *arg, int pending)
793 {
794 struct vtnet_softc *sc;
795
796 sc = arg;
797
798 lwkt_serialize_enter(&sc->vtnet_slz);
799 vtnet_update_link_status(sc);
800 lwkt_serialize_exit(&sc->vtnet_slz);
801 }
802
803 static int
804 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data,struct ucred *cr)
805 {
806 struct vtnet_softc *sc;
807 struct ifreq *ifr;
808 int reinit, mask, error;
809
810 sc = ifp->if_softc;
811 ifr = (struct ifreq *) data;
812 reinit = 0;
813 error = 0;
814
815 switch (cmd) {
816 case SIOCSIFMTU:
817 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > VTNET_MAX_MTU)
818 error = EINVAL;
819 else if (ifp->if_mtu != ifr->ifr_mtu) {
820 lwkt_serialize_enter(&sc->vtnet_slz);
821 error = vtnet_change_mtu(sc, ifr->ifr_mtu);
822 lwkt_serialize_exit(&sc->vtnet_slz);
823 }
824 break;
825
826 case SIOCSIFFLAGS:
827 lwkt_serialize_enter(&sc->vtnet_slz);
828 if ((ifp->if_flags & IFF_UP) == 0) {
829 if (ifp->if_flags & IFF_RUNNING)
830 vtnet_stop(sc);
831 } else if (ifp->if_flags & IFF_RUNNING) {
832 if ((ifp->if_flags ^ sc->vtnet_if_flags) &
833 (IFF_PROMISC | IFF_ALLMULTI)) {
834 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
835 vtnet_rx_filter(sc);
836 else
837 error = ENOTSUP;
838 }
839 } else
840 vtnet_init_locked(sc);
841
842 if (error == 0)
843 sc->vtnet_if_flags = ifp->if_flags;
844 lwkt_serialize_exit(&sc->vtnet_slz);
845 break;
846
847 case SIOCADDMULTI:
848 case SIOCDELMULTI:
849 lwkt_serialize_enter(&sc->vtnet_slz);
850 if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) &&
851 (ifp->if_flags & IFF_RUNNING))
852 vtnet_rx_filter_mac(sc);
853 lwkt_serialize_exit(&sc->vtnet_slz);
854 break;
855
856 case SIOCSIFMEDIA:
857 case SIOCGIFMEDIA:
858 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd);
859 break;
860
861 case SIOCSIFCAP:
862 mask = ifr->ifr_reqcap ^ ifp->if_capenable;
863
864 lwkt_serialize_enter(&sc->vtnet_slz);
865
866 if (mask & IFCAP_TXCSUM) {
867 ifp->if_capenable ^= IFCAP_TXCSUM;
868 if (ifp->if_capenable & IFCAP_TXCSUM)
869 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD;
870 else
871 ifp->if_hwassist &= ~VTNET_CSUM_OFFLOAD;
872 }
873
874 if (mask & IFCAP_TSO4) {
875 ifp->if_capenable ^= IFCAP_TSO4;
876 if (ifp->if_capenable & IFCAP_TSO4)
877 ifp->if_hwassist |= CSUM_TSO;
878 else
879 ifp->if_hwassist &= ~CSUM_TSO;
880 }
881
882 if (mask & IFCAP_RXCSUM) {
883 ifp->if_capenable ^= IFCAP_RXCSUM;
884 reinit = 1;
885 }
886
887 if (mask & IFCAP_LRO) {
888 ifp->if_capenable ^= IFCAP_LRO;
889 reinit = 1;
890 }
891
892 if (mask & IFCAP_VLAN_HWFILTER) {
893 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER;
894 reinit = 1;
895 }
896
897 if (mask & IFCAP_VLAN_HWTSO)
898 ifp->if_capenable ^= IFCAP_VLAN_HWTSO;
899
900 if (mask & IFCAP_VLAN_HWTAGGING)
901 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING;
902
903 if (reinit && (ifp->if_flags & IFF_RUNNING)) {
904 ifp->if_flags &= ~IFF_RUNNING;
905 vtnet_init_locked(sc);
906 }
907 //VLAN_CAPABILITIES(ifp);
908
909 lwkt_serialize_exit(&sc->vtnet_slz);
910 break;
911
912 default:
913 error = ether_ioctl(ifp, cmd, data);
914 break;
915 }
916
917 return (error);
918 }
919
920 static int
921 vtnet_change_mtu(struct vtnet_softc *sc, int new_mtu)
922 {
923 struct ifnet *ifp;
924 int new_frame_size, clsize;
925
926 ifp = sc->vtnet_ifp;
927
928 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
929 new_frame_size = sizeof(struct vtnet_rx_header) +
930 sizeof(struct ether_vlan_header) + new_mtu;
931
932 if (new_frame_size > MJUM9BYTES)
933 return (EINVAL);
934
935 if (new_frame_size <= MCLBYTES)
936 clsize = MCLBYTES;
937 else
938 clsize = MJUM9BYTES;
939 } else {
940 new_frame_size = sizeof(struct virtio_net_hdr_mrg_rxbuf) +
941 sizeof(struct ether_vlan_header) + new_mtu;
942
943 if (new_frame_size <= MCLBYTES)
944 clsize = MCLBYTES;
945 else
946 clsize = MJUMPAGESIZE;
947 }
948
949 sc->vtnet_rx_mbuf_size = clsize;
950 sc->vtnet_rx_mbuf_count = VTNET_NEEDED_RX_MBUFS(sc);
951 KASSERT(sc->vtnet_rx_mbuf_count < VTNET_MAX_RX_SEGS,
952 ("too many rx mbufs: %d", sc->vtnet_rx_mbuf_count));
953
954 ifp->if_mtu = new_mtu;
955
956 if (ifp->if_flags & IFF_RUNNING) {
957 ifp->if_flags &= ~IFF_RUNNING;
958 vtnet_init_locked(sc);
959 }
960
961 return (0);
962 }
963
964 static int
965 vtnet_init_rx_vq(struct vtnet_softc *sc)
966 {
967 struct virtqueue *vq;
968 int nbufs, error;
969
970 vq = sc->vtnet_rx_vq;
971 nbufs = 0;
972 error = ENOSPC;
973
974 while (!virtqueue_full(vq)) {
975 if ((error = vtnet_newbuf(sc)) != 0)
976 break;
977 nbufs++;
978 }
979
980 if (nbufs > 0) {
981 virtqueue_notify(vq, &sc->vtnet_slz);
982
983 /*
984 * EMSGSIZE signifies the virtqueue did not have enough
985 * entries available to hold the last mbuf. This is not
986 * an error. We should not get ENOSPC since we check if
987 * the virtqueue is full before attempting to add a
988 * buffer.
989 */
990 if (error == EMSGSIZE)
991 error = 0;
992 }
993
994 return (error);
995 }
996
997 static void
998 vtnet_free_rx_mbufs(struct vtnet_softc *sc)
999 {
1000 struct virtqueue *vq;
1001 struct mbuf *m;
1002 int last;
1003
1004 vq = sc->vtnet_rx_vq;
1005 last = 0;
1006
1007 while ((m = virtqueue_drain(vq, &last)) != NULL)
1008 m_freem(m);
1009
1010 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Rx Vq"));
1011 }
1012
1013 static void
1014 vtnet_free_tx_mbufs(struct vtnet_softc *sc)
1015 {
1016 struct virtqueue *vq;
1017 struct vtnet_tx_header *txhdr;
1018 int last;
1019
1020 vq = sc->vtnet_tx_vq;
1021 last = 0;
1022
1023 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) {
1024 m_freem(txhdr->vth_mbuf);
1025 vtnet_enqueue_txhdr(sc, txhdr);
1026 }
1027
1028 KASSERT(virtqueue_empty(vq), ("mbufs remaining in Tx Vq"));
1029 }
1030
1031 static void
1032 vtnet_free_ctrl_vq(struct vtnet_softc *sc)
1033 {
1034 /*
1035 * The control virtqueue is only polled, therefore
1036 * it should already be empty.
1037 */
1038 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq),
1039 ("Ctrl Vq not empty"));
1040 }
1041
1042 static struct mbuf *
1043 vtnet_alloc_rxbuf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
1044 {
1045 struct mbuf *m_head, *m_tail, *m;
1046 int i, clsize;
1047
1048 clsize = sc->vtnet_rx_mbuf_size;
1049
1050 /*use getcl instead of getjcl. see if_mxge.c comment line 2398*/
1051 //m_head = m_getjcl(M_DONTWAIT, MT_DATA, M_PKTHDR, clsize);
1052 m_head = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR );
1053 if (m_head == NULL)
1054 goto fail;
1055
1056 m_head->m_len = clsize;
1057 m_tail = m_head;
1058
1059 if (nbufs > 1) {
1060 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1061 ("chained Rx mbuf requested without LRO_NOMRG"));
1062
1063 for (i = 0; i < nbufs - 1; i++) {
1064 //m = m_getjcl(M_DONTWAIT, MT_DATA, 0, clsize);
1065 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1066 if (m == NULL)
1067 goto fail;
1068
1069 m->m_len = clsize;
1070 m_tail->m_next = m;
1071 m_tail = m;
1072 }
1073 }
1074
1075 if (m_tailp != NULL)
1076 *m_tailp = m_tail;
1077
1078 return (m_head);
1079
1080 fail:
1081 sc->vtnet_stats.mbuf_alloc_failed++;
1082 m_freem(m_head);
1083
1084 return (NULL);
1085 }
1086
1087 static int
1088 vtnet_replace_rxbuf(struct vtnet_softc *sc, struct mbuf *m0, int len0)
1089 {
1090 struct mbuf *m, *m_prev;
1091 struct mbuf *m_new, *m_tail;
1092 int len, clsize, nreplace, error;
1093
1094 m = m0;
1095 m_prev = NULL;
1096 len = len0;
1097
1098 m_tail = NULL;
1099 clsize = sc->vtnet_rx_mbuf_size;
1100 nreplace = 0;
1101
1102 if (m->m_next != NULL)
1103 KASSERT(sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1104 ("chained Rx mbuf without LRO_NOMRG"));
1105
1106 /*
1107 * Since LRO_NOMRG mbuf chains are so large, we want to avoid
1108 * allocating an entire chain for each received frame. When
1109 * the received frame's length is less than that of the chain,
1110 * the unused mbufs are reassigned to the new chain.
1111 */
1112 while (len > 0) {
1113 /*
1114 * Something is seriously wrong if we received
1115 * a frame larger than the mbuf chain. Drop it.
1116 */
1117 if (m == NULL) {
1118 sc->vtnet_stats.rx_frame_too_large++;
1119 return (EMSGSIZE);
1120 }
1121
1122 KASSERT(m->m_len == clsize,
1123 ("mbuf length not expected cluster size: %d",
1124 m->m_len));
1125
1126 m->m_len = MIN(m->m_len, len);
1127 len -= m->m_len;
1128
1129 m_prev = m;
1130 m = m->m_next;
1131 nreplace++;
1132 }
1133
1134 KASSERT(m_prev != NULL, ("m_prev == NULL"));
1135 KASSERT(nreplace <= sc->vtnet_rx_mbuf_count,
1136 ("too many replacement mbufs: %d/%d", nreplace,
1137 sc->vtnet_rx_mbuf_count));
1138
1139 m_new = vtnet_alloc_rxbuf(sc, nreplace, &m_tail);
1140 if (m_new == NULL) {
1141 m_prev->m_len = clsize;
1142 return (ENOBUFS);
1143 }
1144
1145 /*
1146 * Move unused mbufs, if any, from the original chain
1147 * onto the end of the new chain.
1148 */
1149 if (m_prev->m_next != NULL) {
1150 m_tail->m_next = m_prev->m_next;
1151 m_prev->m_next = NULL;
1152 }
1153
1154 error = vtnet_enqueue_rxbuf(sc, m_new);
1155 if (error) {
1156 /*
1157 * BAD! We could not enqueue the replacement mbuf chain. We
1158 * must restore the m0 chain to the original state if it was
1159 * modified so we can subsequently discard it.
1160 *
1161 * NOTE: The replacement is suppose to be an identical copy
1162 * to the one just dequeued so this is an unexpected error.
1163 */
1164 sc->vtnet_stats.rx_enq_replacement_failed++;
1165
1166 if (m_tail->m_next != NULL) {
1167 m_prev->m_next = m_tail->m_next;
1168 m_tail->m_next = NULL;
1169 }
1170
1171 m_prev->m_len = clsize;
1172 m_freem(m_new);
1173 }
1174
1175 return (error);
1176 }
1177
1178 static int
1179 vtnet_newbuf(struct vtnet_softc *sc)
1180 {
1181 struct mbuf *m;
1182 int error;
1183
1184 m = vtnet_alloc_rxbuf(sc, sc->vtnet_rx_mbuf_count, NULL);
1185 if (m == NULL)
1186 return (ENOBUFS);
1187
1188 error = vtnet_enqueue_rxbuf(sc, m);
1189 if (error)
1190 m_freem(m);
1191
1192 return (error);
1193 }
1194
1195 static void
1196 vtnet_discard_merged_rxbuf(struct vtnet_softc *sc, int nbufs)
1197 {
1198 struct virtqueue *vq;
1199 struct mbuf *m;
1200
1201 vq = sc->vtnet_rx_vq;
1202
1203 while (--nbufs > 0) {
1204 if ((m = virtqueue_dequeue(vq, NULL)) == NULL)
1205 break;
1206 vtnet_discard_rxbuf(sc, m);
1207 }
1208 }
1209
1210 static void
1211 vtnet_discard_rxbuf(struct vtnet_softc *sc, struct mbuf *m)
1212 {
1213 int error;
1214
1215 /*
1216 * Requeue the discarded mbuf. This should always be
1217 * successful since it was just dequeued.
1218 */
1219 error = vtnet_enqueue_rxbuf(sc, m);
1220 KASSERT(error == 0, ("cannot requeue discarded mbuf"));
1221 }
1222
1223 static int
1224 vtnet_enqueue_rxbuf(struct vtnet_softc *sc, struct mbuf *m)
1225 {
1226 struct sglist sg;
1227 struct sglist_seg segs[VTNET_MAX_RX_SEGS];
1228 struct vtnet_rx_header *rxhdr;
1229 struct virtio_net_hdr *hdr;
1230 uint8_t *mdata;
1231 int offset, error;
1232
1233 ASSERT_SERIALIZED(&sc->vtnet_slz);
1234 if ((sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) == 0)
1235 KASSERT(m->m_next == NULL, ("chained Rx mbuf"));
1236
1237 sglist_init(&sg, sc->vtnet_rx_nsegs, segs);
1238
1239 mdata = mtod(m, uint8_t *);
1240 offset = 0;
1241
1242 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
1243 rxhdr = (struct vtnet_rx_header *) mdata;
1244 hdr = &rxhdr->vrh_hdr;
1245 offset += sizeof(struct vtnet_rx_header);
1246
1247 error = sglist_append(&sg, hdr, sc->vtnet_hdr_size);
1248 KASSERT(error == 0, ("cannot add header to sglist"));
1249 }
1250
1251 error = sglist_append(&sg, mdata + offset, m->m_len - offset);
1252 if (error)
1253 return (error);
1254
1255 if (m->m_next != NULL) {
1256 error = sglist_append_mbuf(&sg, m->m_next);
1257 if (error)
1258 return (error);
1259 }
1260
1261 return (virtqueue_enqueue(sc->vtnet_rx_vq, m, &sg, 0, sg.sg_nseg));
1262 }
1263
1264 static void
1265 vtnet_vlan_tag_remove(struct mbuf *m)
1266 {
1267 struct ether_vlan_header *evl;
1268
1269 evl = mtod(m, struct ether_vlan_header *);
1270
1271 m->m_pkthdr.ether_vlantag = ntohs(evl->evl_tag);
1272 m->m_flags |= M_VLANTAG;
1273
1274 /* Strip the 802.1Q header. */
1275 bcopy((char *) evl, (char *) evl + ETHER_VLAN_ENCAP_LEN,
1276 ETHER_HDR_LEN - ETHER_TYPE_LEN);
1277 m_adj(m, ETHER_VLAN_ENCAP_LEN);
1278 }
1279
1280 /*
1281 * Alternative method of doing receive checksum offloading. Rather
1282 * than parsing the received frame down to the IP header, use the
1283 * csum_offset to determine which CSUM_* flags are appropriate. We
1284 * can get by with doing this only because the checksum offsets are
1285 * unique for the things we care about.
1286 */
1287 static int
1288 vtnet_rx_csum(struct vtnet_softc *sc, struct mbuf *m,
1289 struct virtio_net_hdr *hdr)
1290 {
1291 struct ether_header *eh;
1292 struct ether_vlan_header *evh;
1293 struct udphdr *udp;
1294 int csum_len;
1295 uint16_t eth_type;
1296
1297 csum_len = hdr->csum_start + hdr->csum_offset;
1298
1299 if (csum_len < sizeof(struct ether_header) + sizeof(struct ip))
1300 return (1);
1301 if (m->m_len < csum_len)
1302 return (1);
1303
1304 eh = mtod(m, struct ether_header *);
1305 eth_type = ntohs(eh->ether_type);
1306 if (eth_type == ETHERTYPE_VLAN) {
1307 evh = mtod(m, struct ether_vlan_header *);
1308 eth_type = ntohs(evh->evl_proto);
1309 }
1310
1311 if (eth_type != ETHERTYPE_IP && eth_type != ETHERTYPE_IPV6) {
1312 sc->vtnet_stats.rx_csum_bad_ethtype++;
1313 return (1);
1314 }
1315
1316 /* Use the offset to determine the appropriate CSUM_* flags. */
1317 switch (hdr->csum_offset) {
1318 case offsetof(struct udphdr, uh_sum):
1319 if (m->m_len < hdr->csum_start + sizeof(struct udphdr))
1320 return (1);
1321 udp = (struct udphdr *)(mtod(m, uint8_t *) + hdr->csum_start);
1322 if (udp->uh_sum == 0)
1323 return (0);
1324
1325 /* FALLTHROUGH */
1326
1327 case offsetof(struct tcphdr, th_sum):
1328 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1329 m->m_pkthdr.csum_data = 0xFFFF;
1330 break;
1331
1332 default:
1333 sc->vtnet_stats.rx_csum_bad_offset++;
1334 return (1);
1335 }
1336
1337 sc->vtnet_stats.rx_csum_offloaded++;
1338
1339 return (0);
1340 }
1341
1342 static int
1343 vtnet_rxeof_merged(struct vtnet_softc *sc, struct mbuf *m_head, int nbufs)
1344 {
1345 struct ifnet *ifp;
1346 struct virtqueue *vq;
1347 struct mbuf *m, *m_tail;
1348 int len;
1349
1350 ifp = sc->vtnet_ifp;
1351 vq = sc->vtnet_rx_vq;
1352 m_tail = m_head;
1353
1354 while (--nbufs > 0) {
1355 m = virtqueue_dequeue(vq, &len);
1356 if (m == NULL) {
1357 ifp->if_ierrors++;
1358 goto fail;
1359 }
1360
1361 if (vtnet_newbuf(sc) != 0) {
1362 ifp->if_iqdrops++;
1363 vtnet_discard_rxbuf(sc, m);
1364 if (nbufs > 1)
1365 vtnet_discard_merged_rxbuf(sc, nbufs);
1366 goto fail;
1367 }
1368
1369 if (m->m_len < len)
1370 len = m->m_len;
1371
1372 m->m_len = len;
1373 m->m_flags &= ~M_PKTHDR;
1374
1375 m_head->m_pkthdr.len += len;
1376 m_tail->m_next = m;
1377 m_tail = m;
1378 }
1379
1380 return (0);
1381
1382 fail:
1383 sc->vtnet_stats.rx_mergeable_failed++;
1384 m_freem(m_head);
1385
1386 return (1);
1387 }
1388
1389 static int
1390 vtnet_rxeof(struct vtnet_softc *sc, int count, int *rx_npktsp)
1391 {
1392 struct virtio_net_hdr lhdr;
1393 struct ifnet *ifp;
1394 struct virtqueue *vq;
1395 struct mbuf *m;
1396 struct ether_header *eh;
1397 struct virtio_net_hdr *hdr;
1398 struct virtio_net_hdr_mrg_rxbuf *mhdr;
1399 int len, deq, nbufs, adjsz, rx_npkts;
1400
1401 ifp = sc->vtnet_ifp;
1402 vq = sc->vtnet_rx_vq;
1403 hdr = &lhdr;
1404 deq = 0;
1405 rx_npkts = 0;
1406
1407 ASSERT_SERIALIZED(&sc->vtnet_slz);
1408
1409 while (--count >= 0) {
1410 m = virtqueue_dequeue(vq, &len);
1411 if (m == NULL)
1412 break;
1413 deq++;
1414
1415 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) {
1416 ifp->if_ierrors++;
1417 vtnet_discard_rxbuf(sc, m);
1418 continue;
1419 }
1420
1421 if ((sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) == 0) {
1422 nbufs = 1;
1423 adjsz = sizeof(struct vtnet_rx_header);
1424 /*
1425 * Account for our pad between the header and
1426 * the actual start of the frame.
1427 */
1428 len += VTNET_RX_HEADER_PAD;
1429 } else {
1430 mhdr = mtod(m, struct virtio_net_hdr_mrg_rxbuf *);
1431 nbufs = mhdr->num_buffers;
1432 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1433 }
1434
1435 if (vtnet_replace_rxbuf(sc, m, len) != 0) {
1436 ifp->if_iqdrops++;
1437 vtnet_discard_rxbuf(sc, m);
1438 if (nbufs > 1)
1439 vtnet_discard_merged_rxbuf(sc, nbufs);
1440 continue;
1441 }
1442
1443 m->m_pkthdr.len = len;
1444 m->m_pkthdr.rcvif = ifp;
1445 m->m_pkthdr.csum_flags = 0;
1446
1447 if (nbufs > 1) {
1448 if (vtnet_rxeof_merged(sc, m, nbufs) != 0)
1449 continue;
1450 }
1451
1452 ifp->if_ipackets++;
1453
1454 /*
1455 * Save copy of header before we strip it. For both mergeable
1456 * and non-mergeable, the VirtIO header is placed first in the
1457 * mbuf's data. We no longer need num_buffers, so always use a
1458 * virtio_net_hdr.
1459 */
1460 memcpy(hdr, mtod(m, void *), sizeof(struct virtio_net_hdr));
1461 m_adj(m, adjsz);
1462
1463 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) {
1464 eh = mtod(m, struct ether_header *);
1465 if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
1466 vtnet_vlan_tag_remove(m);
1467
1468 /*
1469 * With the 802.1Q header removed, update the
1470 * checksum starting location accordingly.
1471 */
1472 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
1473 hdr->csum_start -=
1474 ETHER_VLAN_ENCAP_LEN;
1475 }
1476 }
1477
1478 if (ifp->if_capenable & IFCAP_RXCSUM &&
1479 hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1480 if (vtnet_rx_csum(sc, m, hdr) != 0)
1481 sc->vtnet_stats.rx_csum_failed++;
1482 }
1483
1484 lwkt_serialize_exit(&sc->vtnet_slz);
1485 rx_npkts++;
1486 ifp->if_input(ifp, m, NULL, -1);
1487 lwkt_serialize_enter(&sc->vtnet_slz);
1488
1489 /*
1490 * The interface may have been stopped while we were
1491 * passing the packet up the network stack.
1492 */
1493 if ((ifp->if_flags & IFF_RUNNING) == 0)
1494 break;
1495 }
1496
1497 virtqueue_notify(vq, &sc->vtnet_slz);
1498
1499 if (rx_npktsp != NULL)
1500 *rx_npktsp = rx_npkts;
1501
1502 return (count > 0 ? 0 : EAGAIN);
1503 }
1504
1505 static void
1506 vtnet_rx_intr_task(void *arg)
1507 {
1508 struct vtnet_softc *sc;
1509 struct ifnet *ifp;
1510 int more;
1511
1512 sc = arg;
1513 ifp = sc->vtnet_ifp;
1514
1515 next:
1516 // lwkt_serialize_enter(&sc->vtnet_slz);
1517
1518 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1519 vtnet_enable_rx_intr(sc);
1520 // lwkt_serialize_exit(&sc->vtnet_slz);
1521 return;
1522 }
1523
1524 more = vtnet_rxeof(sc, sc->vtnet_rx_process_limit, NULL);
1525 if (!more && vtnet_enable_rx_intr(sc) != 0) {
1526 vtnet_disable_rx_intr(sc);
1527 more = 1;
1528 }
1529
1530 // lwkt_serialize_exit(&sc->vtnet_slz);
1531
1532 if (more) {
1533 sc->vtnet_stats.rx_task_rescheduled++;
1534 goto next;
1535 }
1536 }
1537
1538 static int
1539 vtnet_rx_vq_intr(void *xsc)
1540 {
1541 struct vtnet_softc *sc;
1542
1543 sc = xsc;
1544
1545 vtnet_disable_rx_intr(sc);
1546 vtnet_rx_intr_task(sc);
1547
1548 return (1);
1549 }
1550
1551 static void
1552 vtnet_enqueue_txhdr(struct vtnet_softc *sc, struct vtnet_tx_header *txhdr)
1553 {
1554 bzero(txhdr, sizeof(*txhdr));
1555 SLIST_INSERT_HEAD(&sc->vtnet_txhdr_free, txhdr, link);
1556 }
1557
1558 static void
1559 vtnet_txeof(struct vtnet_softc *sc)
1560 {
1561 struct virtqueue *vq;
1562 struct ifnet *ifp;
1563 struct vtnet_tx_header *txhdr;
1564 int deq;
1565
1566 vq = sc->vtnet_tx_vq;
1567 ifp = sc->vtnet_ifp;
1568 deq = 0;
1569
1570 ASSERT_SERIALIZED(&sc->vtnet_slz);
1571
1572 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) {
1573 deq++;
1574 ifp->if_opackets++;
1575 m_freem(txhdr->vth_mbuf);
1576 vtnet_enqueue_txhdr(sc, txhdr);
1577 }
1578
1579 if (deq > 0) {
1580 ifq_clr_oactive(&ifp->if_snd);
1581 if (virtqueue_empty(vq))
1582 sc->vtnet_watchdog_timer = 0;
1583 }
1584 }
1585
1586 static struct mbuf *
1587 vtnet_tx_offload(struct vtnet_softc *sc, struct mbuf *m,
1588 struct virtio_net_hdr *hdr)
1589 {
1590 struct ifnet *ifp;
1591 struct ether_header *eh;
1592 struct ether_vlan_header *evh;
1593 struct ip *ip;
1594 struct ip6_hdr *ip6;
1595 struct tcphdr *tcp;
1596 int ip_offset;
1597 uint16_t eth_type, csum_start;
1598 uint8_t ip_proto, gso_type;
1599
1600 ifp = sc->vtnet_ifp;
1601 M_ASSERTPKTHDR(m);
1602
1603 ip_offset = sizeof(struct ether_header);
1604 if (m->m_len < ip_offset) {
1605 if ((m = m_pullup(m, ip_offset)) == NULL)
1606 return (NULL);
1607 }
1608
1609 eh = mtod(m, struct ether_header *);
1610 eth_type = ntohs(eh->ether_type);
1611 if (eth_type == ETHERTYPE_VLAN) {
1612 ip_offset = sizeof(struct ether_vlan_header);
1613 if (m->m_len < ip_offset) {
1614 if ((m = m_pullup(m, ip_offset)) == NULL)
1615 return (NULL);
1616 }
1617 evh = mtod(m, struct ether_vlan_header *);
1618 eth_type = ntohs(evh->evl_proto);
1619 }
1620
1621 switch (eth_type) {
1622 case ETHERTYPE_IP:
1623 if (m->m_len < ip_offset + sizeof(struct ip)) {
1624 m = m_pullup(m, ip_offset + sizeof(struct ip));
1625 if (m == NULL)
1626 return (NULL);
1627 }
1628
1629 ip = (struct ip *)(mtod(m, uint8_t *) + ip_offset);
1630 ip_proto = ip->ip_p;
1631 csum_start = ip_offset + (ip->ip_hl << 2);
1632 gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1633 break;
1634
1635 case ETHERTYPE_IPV6:
1636 if (m->m_len < ip_offset + sizeof(struct ip6_hdr)) {
1637 m = m_pullup(m, ip_offset + sizeof(struct ip6_hdr));
1638 if (m == NULL)
1639 return (NULL);
1640 }
1641
1642 ip6 = (struct ip6_hdr *)(mtod(m, uint8_t *) + ip_offset);
1643 /*
1644 * XXX Assume no extension headers are present. Presently,
1645 * this will always be true in the case of TSO, and FreeBSD
1646 * does not perform checksum offloading of IPv6 yet.
1647 */
1648 ip_proto = ip6->ip6_nxt;
1649 csum_start = ip_offset + sizeof(struct ip6_hdr);
1650 gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1651 break;
1652
1653 default:
1654 return (m);
1655 }
1656
1657 if (m->m_pkthdr.csum_flags & VTNET_CSUM_OFFLOAD) {
1658 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
1659 hdr->csum_start = csum_start;
1660 hdr->csum_offset = m->m_pkthdr.csum_data;
1661
1662 sc->vtnet_stats.tx_csum_offloaded++;
1663 }
1664
1665 if (m->m_pkthdr.csum_flags & CSUM_TSO) {
1666 if (ip_proto != IPPROTO_TCP)
1667 return (m);
1668
1669 if (m->m_len < csum_start + sizeof(struct tcphdr)) {
1670 m = m_pullup(m, csum_start + sizeof(struct tcphdr));
1671 if (m == NULL)
1672 return (NULL);
1673 }
1674
1675 tcp = (struct tcphdr *)(mtod(m, uint8_t *) + csum_start);
1676 hdr->gso_type = gso_type;
1677 hdr->hdr_len = csum_start + (tcp->th_off << 2);
1678 hdr->gso_size = m->m_pkthdr.tso_segsz;
1679
1680 if (tcp->th_flags & TH_CWR) {
1681 /*
1682 * Drop if we did not negotiate VIRTIO_NET_F_HOST_ECN.
1683 * ECN support is only configurable globally with the
1684 * net.inet.tcp.ecn.enable sysctl knob.
1685 */
1686 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) {
1687 if_printf(ifp, "TSO with ECN not supported "
1688 "by host\n");
1689 m_freem(m);
1690 return (NULL);
1691 }
1692
1693 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
1694 }
1695
1696 sc->vtnet_stats.tx_tso_offloaded++;
1697 }
1698
1699 return (m);
1700 }
1701
1702 static int
1703 vtnet_enqueue_txbuf(struct vtnet_softc *sc, struct mbuf **m_head,
1704 struct vtnet_tx_header *txhdr)
1705 {
1706 struct sglist sg;
1707 struct sglist_seg segs[VTNET_MAX_TX_SEGS];
1708 struct virtqueue *vq;
1709 struct mbuf *m;
1710 int error;
1711
1712 vq = sc->vtnet_tx_vq;
1713 m = *m_head;
1714
1715 sglist_init(&sg, sc->vtnet_tx_nsegs, segs);
1716 error = sglist_append(&sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size);
1717 KASSERT(error == 0 && sg.sg_nseg == 1,
1718 ("%s: error %d adding header to sglist", __func__, error));
1719
1720 error = sglist_append_mbuf(&sg, m);
1721 if (error) {
1722 m = m_defrag(m, M_NOWAIT);
1723 if (m == NULL)
1724 goto fail;
1725
1726 *m_head = m;
1727 sc->vtnet_stats.tx_defragged++;
1728
1729 error = sglist_append_mbuf(&sg, m);
1730 if (error)
1731 goto fail;
1732 }
1733
1734 txhdr->vth_mbuf = m;
1735 error = virtqueue_enqueue(vq, txhdr, &sg, sg.sg_nseg, 0);
1736
1737 return (error);
1738
1739 fail:
1740 sc->vtnet_stats.tx_defrag_failed++;
1741 m_freem(*m_head);
1742 *m_head = NULL;
1743
1744 return (ENOBUFS);
1745 }
1746
1747 static struct mbuf *
1748 vtnet_vlan_tag_insert(struct mbuf *m)
1749 {
1750 struct mbuf *n;
1751 struct ether_vlan_header *evl;
1752
1753 if (M_WRITABLE(m) == 0) {
1754 n = m_dup(m, M_NOWAIT);
1755 m_freem(m);
1756 if ((m = n) == NULL)
1757 return (NULL);
1758 }
1759
1760 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
1761 if (m == NULL)
1762 return (NULL);
1763 if (m->m_len < sizeof(struct ether_vlan_header)) {
1764 m = m_pullup(m, sizeof(struct ether_vlan_header));
1765 if (m == NULL)
1766 return (NULL);
1767 }
1768
1769 /* Insert 802.1Q header into the existing Ethernet header. */
1770 evl = mtod(m, struct ether_vlan_header *);
1771 bcopy((char *) evl + ETHER_VLAN_ENCAP_LEN,
1772 (char *) evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
1773 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
1774 evl->evl_tag = htons(m->m_pkthdr.ether_vlantag);
1775 m->m_flags &= ~M_VLANTAG;
1776
1777 return (m);
1778 }
1779
1780 static int
1781 vtnet_encap(struct vtnet_softc *sc, struct mbuf **m_head)
1782 {
1783 struct vtnet_tx_header *txhdr;
1784 struct virtio_net_hdr *hdr;
1785 struct mbuf *m;
1786 int error;
1787
1788 txhdr = SLIST_FIRST(&sc->vtnet_txhdr_free);
1789 if (txhdr == NULL)
1790 return (ENOBUFS);
1791 SLIST_REMOVE_HEAD(&sc->vtnet_txhdr_free, link);
1792
1793 /*
1794 * Always use the non-mergeable header to simplify things. When
1795 * the mergeable feature is negotiated, the num_buffers field
1796 * must be set to zero. We use vtnet_hdr_size later to enqueue
1797 * the correct header size to the host.
1798 */
1799 hdr = &txhdr->vth_uhdr.hdr;
1800 m = *m_head;
1801
1802 error = ENOBUFS;
1803
1804 if (m->m_flags & M_VLANTAG) {
1805 //m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
1806 m = vtnet_vlan_tag_insert(m);
1807 if ((*m_head = m) == NULL)
1808 goto fail;
1809 m->m_flags &= ~M_VLANTAG;
1810 }
1811
1812 if (m->m_pkthdr.csum_flags != 0) {
1813 m = vtnet_tx_offload(sc, m, hdr);
1814 if ((*m_head = m) == NULL)
1815 goto fail;
1816 }
1817
1818 error = vtnet_enqueue_txbuf(sc, m_head, txhdr);
1819 fail:
1820 if (error != 0)
1821 vtnet_enqueue_txhdr(sc, txhdr);
1822 return (error);
1823 }
1824
1825 static void
1826 vtnet_start(struct ifnet *ifp, struct ifaltq_subque *ifsq)
1827 {
1828 struct vtnet_softc *sc;
1829
1830 sc = ifp->if_softc;
1831
1832 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
1833 lwkt_serialize_enter(&sc->vtnet_slz);
1834 vtnet_start_locked(ifp, ifsq);
1835 lwkt_serialize_exit(&sc->vtnet_slz);
1836 }
1837
1838 static void
1839 vtnet_start_locked(struct ifnet *ifp, struct ifaltq_subque *ifsq)
1840 {
1841 struct vtnet_softc *sc;
1842 struct virtqueue *vq;
1843 struct mbuf *m0;
1844 int enq;
1845
1846 sc = ifp->if_softc;
1847 vq = sc->vtnet_tx_vq;
1848 enq = 0;
1849
1850 ASSERT_SERIALIZED(&sc->vtnet_slz);
1851
1852 if ((ifp->if_flags & (IFF_RUNNING)) !=
1853 IFF_RUNNING || ((sc->vtnet_flags & VTNET_FLAG_LINK) == 0))
1854 return;
1855
1856 #ifdef VTNET_TX_INTR_MODERATION
1857 if (virtqueue_nused(vq) >= sc->vtnet_tx_size / 2)
1858 vtnet_txeof(sc);
1859 #endif
1860
1861 while (!ifsq_is_empty(ifsq)) {
1862 if (virtqueue_full(vq)) {
1863 ifq_set_oactive(&ifp->if_snd);
1864 break;
1865 }
1866
1867 m0 = ifq_dequeue(&ifp->if_snd);
1868 if (m0 == NULL)
1869 break;
1870
1871 if (vtnet_encap(sc, &m0) != 0) {
1872 if (m0 == NULL)
1873 break;
1874 ifq_prepend(&ifp->if_snd, m0);
1875 ifq_set_oactive(&ifp->if_snd);
1876 break;
1877 }
1878
1879 enq++;
1880 ETHER_BPF_MTAP(ifp, m0);
1881 }
1882
1883 if (enq > 0) {
1884 virtqueue_notify(vq, &sc->vtnet_slz);
1885 sc->vtnet_watchdog_timer = VTNET_WATCHDOG_TIMEOUT;
1886 }
1887 }
1888
1889 static void
1890 vtnet_tick(void *xsc)
1891 {
1892 struct vtnet_softc *sc;
1893
1894 sc = xsc;
1895
1896 #if 0
1897 ASSERT_SERIALIZED(&sc->vtnet_slz);
1898 #ifdef VTNET_DEBUG
1899 virtqueue_dump(sc->vtnet_rx_vq);
1900 virtqueue_dump(sc->vtnet_tx_vq);
1901 #endif
1902
1903 vtnet_watchdog(sc);
1904 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
1905 #endif
1906 }
1907
1908 static void
1909 vtnet_tx_intr_task(void *arg)
1910 {
1911 struct vtnet_softc *sc;
1912 struct ifnet *ifp;
1913 struct ifaltq_subque *ifsq;
1914
1915 sc = arg;
1916 ifp = sc->vtnet_ifp;
1917 ifsq = ifq_get_subq_default(&ifp->if_snd);
1918
1919 next:
1920 // lwkt_serialize_enter(&sc->vtnet_slz);
1921
1922 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1923 vtnet_enable_tx_intr(sc);
1924 // lwkt_serialize_exit(&sc->vtnet_slz);
1925 return;
1926 }
1927
1928 vtnet_txeof(sc);
1929
1930 if (!ifsq_is_empty(ifsq))
1931 vtnet_start_locked(ifp, ifsq);
1932
1933 if (vtnet_enable_tx_intr(sc) != 0) {
1934 vtnet_disable_tx_intr(sc);
1935 sc->vtnet_stats.tx_task_rescheduled++;
1936 // lwkt_serialize_exit(&sc->vtnet_slz);
1937 goto next;
1938 }
1939
1940 // lwkt_serialize_exit(&sc->vtnet_slz);
1941 }
1942
1943 static int
1944 vtnet_tx_vq_intr(void *xsc)
1945 {
1946 struct vtnet_softc *sc;
1947
1948 sc = xsc;
1949
1950 vtnet_disable_tx_intr(sc);
1951 vtnet_tx_intr_task(sc);
1952
1953 return (1);
1954 }
1955
1956 static void
1957 vtnet_stop(struct vtnet_softc *sc)
1958 {
1959 device_t dev;
1960 struct ifnet *ifp;
1961
1962 dev = sc->vtnet_dev;
1963 ifp = sc->vtnet_ifp;
1964
1965 ASSERT_SERIALIZED(&sc->vtnet_slz);
1966
1967 sc->vtnet_watchdog_timer = 0;
1968 callout_stop(&sc->vtnet_tick_ch);
1969 ifq_clr_oactive(&ifp->if_snd);
1970 ifp->if_flags &= ~(IFF_RUNNING);
1971
1972 vtnet_disable_rx_intr(sc);
1973 vtnet_disable_tx_intr(sc);
1974
1975 /*
1976 * Stop the host VirtIO adapter. Note this will reset the host
1977 * adapter's state back to the pre-initialized state, so in
1978 * order to make the device usable again, we must drive it
1979 * through virtio_reinit() and virtio_reinit_complete().
1980 */
1981 virtio_stop(dev);
1982
1983 sc->vtnet_flags &= ~VTNET_FLAG_LINK;
1984
1985 vtnet_free_rx_mbufs(sc);
1986 vtnet_free_tx_mbufs(sc);
1987 }
1988
1989 static int
1990 vtnet_virtio_reinit(struct vtnet_softc *sc)
1991 {
1992 device_t dev;
1993 struct ifnet *ifp;
1994 uint64_t features;
1995 int error;
1996
1997 dev = sc->vtnet_dev;
1998 ifp = sc->vtnet_ifp;
1999 features = sc->vtnet_features;
2000
2001 /*
2002 * Re-negotiate with the host, removing any disabled receive
2003 * features. Transmit features are disabled only on our side
2004 * via if_capenable and if_hwassist.
2005 */
2006
2007 if (ifp->if_capabilities & IFCAP_RXCSUM) {
2008 if ((ifp->if_capenable & IFCAP_RXCSUM) == 0)
2009 features &= ~VIRTIO_NET_F_GUEST_CSUM;
2010 }
2011
2012 if (ifp->if_capabilities & IFCAP_LRO) {
2013 if ((ifp->if_capenable & IFCAP_LRO) == 0)
2014 features &= ~VTNET_LRO_FEATURES;
2015 }
2016
2017 if (ifp->if_capabilities & IFCAP_VLAN_HWFILTER) {
2018 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0)
2019 features &= ~VIRTIO_NET_F_CTRL_VLAN;
2020 }
2021
2022 error = virtio_reinit(dev, features);
2023 if (error)
2024 device_printf(dev, "virtio reinit error %d\n", error);
2025
2026 return (error);
2027 }
2028
2029 static void
2030 vtnet_init_locked(struct vtnet_softc *sc)
2031 {
2032 device_t dev;
2033 struct ifnet *ifp;
2034 int error;
2035
2036 dev = sc->vtnet_dev;
2037 ifp = sc->vtnet_ifp;
2038
2039 ASSERT_SERIALIZED(&sc->vtnet_slz);
2040
2041 if (ifp->if_flags & IFF_RUNNING)
2042 return;
2043
2044 /* Stop host's adapter, cancel any pending I/O. */
2045 vtnet_stop(sc);
2046
2047 /* Reinitialize the host device. */
2048 error = vtnet_virtio_reinit(sc);
2049 if (error) {
2050 device_printf(dev,
2051 "reinitialization failed, stopping device...\n");
2052 vtnet_stop(sc);
2053 return;
2054 }
2055
2056 /* Update host with assigned MAC address. */
2057 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN);
2058 vtnet_set_hwaddr(sc);
2059
2060 ifp->if_hwassist = 0;
2061 if (ifp->if_capenable & IFCAP_TXCSUM)
2062 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD;
2063 if (ifp->if_capenable & IFCAP_TSO4)
2064 ifp->if_hwassist |= CSUM_TSO;
2065
2066 error = vtnet_init_rx_vq(sc);
2067 if (error) {
2068 device_printf(dev,
2069 "cannot allocate mbufs for Rx virtqueue\n");
2070 vtnet_stop(sc);
2071 return;
2072 }
2073
2074 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
2075 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
2076 /* Restore promiscuous and all-multicast modes. */
2077 vtnet_rx_filter(sc);
2078
2079 /* Restore filtered MAC addresses. */
2080 vtnet_rx_filter_mac(sc);
2081 }
2082
2083 /* Restore VLAN filters. */
2084 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER)
2085 vtnet_rx_filter_vlan(sc);
2086 }
2087
2088 {
2089 vtnet_enable_rx_intr(sc);
2090 vtnet_enable_tx_intr(sc);
2091 }
2092
2093 ifp->if_flags |= IFF_RUNNING;
2094 ifq_clr_oactive(&ifp->if_snd);
2095
2096 virtio_reinit_complete(dev);
2097
2098 vtnet_update_link_status(sc);
2099 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
2100 }
2101
2102 static void
2103 vtnet_init(void *xsc)
2104 {
2105 struct vtnet_softc *sc;
2106
2107 sc = xsc;
2108
2109 lwkt_serialize_enter(&sc->vtnet_slz);
2110 vtnet_init_locked(sc);
2111 lwkt_serialize_exit(&sc->vtnet_slz);
2112 }
2113
2114 static void
2115 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie,
2116 struct sglist *sg, int readable, int writable)
2117 {
2118 struct virtqueue *vq;
2119 void *c;
2120
2121 vq = sc->vtnet_ctrl_vq;
2122
2123 ASSERT_SERIALIZED(&sc->vtnet_slz);
2124 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ,
2125 ("no control virtqueue"));
2126 KASSERT(virtqueue_empty(vq),
2127 ("control command already enqueued"));
2128
2129 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) != 0)
2130 return;
2131
2132 virtqueue_notify(vq, &sc->vtnet_slz);
2133
2134 /*
2135 * Poll until the command is complete. Previously, we would
2136 * sleep until the control virtqueue interrupt handler woke
2137 * us up, but dropping the VTNET_MTX leads to serialization
2138 * difficulties.
2139 *
2140 * Furthermore, it appears QEMU/KVM only allocates three MSIX
2141 * vectors. Two of those vectors are needed for the Rx and Tx
2142 * virtqueues. We do not support sharing both a Vq and config
2143 * changed notification on the same MSIX vector.
2144 */
2145 c = virtqueue_poll(vq, NULL);
2146 KASSERT(c == cookie, ("unexpected control command response"));
2147 }
2148
2149 static int
2150 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr)
2151 {
2152 struct {
2153 struct virtio_net_ctrl_hdr hdr __aligned(2);
2154 uint8_t pad1;
2155 char aligned_hwaddr[ETHER_ADDR_LEN] __aligned(8);
2156 uint8_t pad2;
2157 uint8_t ack;
2158 } s;
2159 struct sglist_seg segs[3];
2160 struct sglist sg;
2161 int error;
2162
2163 s.hdr.class = VIRTIO_NET_CTRL_MAC;
2164 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
2165 s.ack = VIRTIO_NET_ERR;
2166
2167 /* Copy the mac address into physically contiguous memory */
2168 memcpy(s.aligned_hwaddr, hwaddr, ETHER_ADDR_LEN);
2169
2170 sglist_init(&sg, 3, segs);
2171 error = 0;
2172 error |= sglist_append(&sg, &s.hdr,
2173 sizeof(struct virtio_net_ctrl_hdr));
2174 error |= sglist_append(&sg, s.aligned_hwaddr, ETHER_ADDR_LEN);
2175 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
2176 KASSERT(error == 0 && sg.sg_nseg == 3,
2177 ("%s: error %d adding set MAC msg to sglist", __func__, error));
2178
2179 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
2180
2181 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
2182 }
2183
2184 static void
2185 vtnet_rx_filter(struct vtnet_softc *sc)
2186 {
2187 device_t dev;
2188 struct ifnet *ifp;
2189
2190 dev = sc->vtnet_dev;
2191 ifp = sc->vtnet_ifp;
2192
2193 ASSERT_SERIALIZED(&sc->vtnet_slz);
2194 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
2195 ("CTRL_RX feature not negotiated"));
2196
2197 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0)
2198 device_printf(dev, "cannot %s promiscuous mode\n",
2199 (ifp->if_flags & IFF_PROMISC) ? "enable" : "disable");
2200
2201 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0)
2202 device_printf(dev, "cannot %s all-multicast mode\n",
2203 (ifp->if_flags & IFF_ALLMULTI) ? "enable" : "disable");
2204 }
2205
2206 static int
2207 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, int cmd, int on)
2208 {
2209 struct sglist_seg segs[3];
2210 struct sglist sg;
2211 struct {
2212 struct virtio_net_ctrl_hdr hdr __aligned(2);
2213 uint8_t pad1;
2214 uint8_t onoff;
2215 uint8_t pad2;
2216 uint8_t ack;
2217 } s;
2218 int error;
2219
2220 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
2221 ("%s: CTRL_RX feature not negotiated", __func__));
2222
2223 s.hdr.class = VIRTIO_NET_CTRL_RX;
2224 s.hdr.cmd = cmd;
2225 s.onoff = !!on;
2226 s.ack = VIRTIO_NET_ERR;
2227
2228 sglist_init(&sg, 3, segs);
2229 error = 0;
2230 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
2231 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t));
2232 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
2233 KASSERT(error == 0 && sg.sg_nseg == 3,
2234 ("%s: error %d adding Rx message to sglist", __func__, error));
2235
2236 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
2237
2238 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
2239 }
2240
2241 static int
2242 vtnet_set_promisc(struct vtnet_softc *sc, int on)
2243 {
2244
2245 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on));
2246 }
2247
2248 static int
2249 vtnet_set_allmulti(struct vtnet_softc *sc, int on)
2250 {
2251
2252 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on));
2253 }
2254
2255 static void
2256 vtnet_rx_filter_mac(struct vtnet_softc *sc)
2257 {
2258 struct virtio_net_ctrl_hdr hdr __aligned(2);
2259 struct vtnet_mac_filter *filter;
2260 struct sglist_seg segs[4];
2261 struct sglist sg;
2262 struct ifnet *ifp;
2263 struct ifaddr *ifa;
2264 struct ifaddr_container *ifac;
2265 struct ifmultiaddr *ifma;
2266 int ucnt, mcnt, promisc, allmulti, error;
2267 uint8_t ack;
2268
2269 ifp = sc->vtnet_ifp;
2270 ucnt = 0;
2271 mcnt = 0;
2272 promisc = 0;
2273 allmulti = 0;
2274
2275 ASSERT_SERIALIZED(&sc->vtnet_slz);
2276 KASSERT(sc->vtnet_flags & VTNET_FLAG_CTRL_RX,
2277 ("%s: CTRL_RX feature not negotiated", __func__));
2278
2279 /* Use the MAC filtering table allocated in vtnet_attach. */
2280 filter = sc->vtnet_macfilter;
2281 memset(filter, 0, sizeof(struct vtnet_mac_filter));
2282
2283 /* Unicast MAC addresses: */
2284 //if_addr_rlock(ifp);
2285 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2286 ifa = ifac->ifa;
2287 if (ifa->ifa_addr->sa_family != AF_LINK)
2288 continue;
2289 else if (memcmp(LLADDR((struct sockaddr_dl *)ifa->ifa_addr),
2290 sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0)
2291 continue;
2292 else if (ucnt == VTNET_MAX_MAC_ENTRIES) {
2293 promisc = 1;
2294 break;
2295 }
2296
2297 bcopy(LLADDR((struct sockaddr_dl *)ifa->ifa_addr),
2298 &filter->vmf_unicast.macs[ucnt], ETHER_ADDR_LEN);
2299 ucnt++;
2300 }
2301 //if_addr_runlock(ifp);
2302
2303 if (promisc != 0) {
2304 filter->vmf_unicast.nentries = 0;
2305 if_printf(ifp, "more than %d MAC addresses assigned, "
2306 "falling back to promiscuous mode\n",
2307 VTNET_MAX_MAC_ENTRIES);
2308 } else
2309 filter->vmf_unicast.nentries = ucnt;
2310
2311 /* Multicast MAC addresses: */
2312 //if_maddr_rlock(ifp);
2313 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2314 if (ifma->ifma_addr->sa_family != AF_LINK)
2315 continue;
2316 else if (mcnt == VTNET_MAX_MAC_ENTRIES) {
2317 allmulti = 1;
2318 break;
2319 }
2320
2321 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
2322 &filter->vmf_multicast.macs[mcnt], ETHER_ADDR_LEN);
2323 mcnt++;
2324 }
2325 //if_maddr_runlock(ifp);
2326
2327 if (allmulti != 0) {
2328 filter->vmf_multicast.nentries = 0;
2329 if_printf(ifp, "more than %d multicast MAC addresses "
2330 "assigned, falling back to all-multicast mode\n",
2331 VTNET_MAX_MAC_ENTRIES);
2332 } else
2333 filter->vmf_multicast.nentries = mcnt;
2334
2335 if (promisc != 0 && allmulti != 0)
2336 goto out;
2337
2338 hdr.class = VIRTIO_NET_CTRL_MAC;
2339 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
2340 ack = VIRTIO_NET_ERR;
2341
2342 sglist_init(&sg, 4, segs);
2343 error = 0;
2344 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr));
2345 error |= sglist_append(&sg, &filter->vmf_unicast,
2346 sizeof(uint32_t) + filter->vmf_unicast.nentries * ETHER_ADDR_LEN);
2347 error |= sglist_append(&sg, &filter->vmf_multicast,
2348 sizeof(uint32_t) + filter->vmf_multicast.nentries * ETHER_ADDR_LEN);
2349 error |= sglist_append(&sg, &ack, sizeof(uint8_t));
2350 KASSERT(error == 0 && sg.sg_nseg == 4,
2351 ("%s: error %d adding MAC filter msg to sglist", __func__, error));
2352
2353 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1);
2354
2355 if (ack != VIRTIO_NET_OK)
2356 if_printf(ifp, "error setting host MAC filter table\n");
2357
2358 out:
2359 if (promisc != 0 && vtnet_set_promisc(sc, 1) != 0)
2360 if_printf(ifp, "cannot enable promiscuous mode\n");
2361 if (allmulti != 0 && vtnet_set_allmulti(sc, 1) != 0)
2362 if_printf(ifp, "cannot enable all-multicast mode\n");
2363 }
2364
2365 static int
2366 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
2367 {
2368 struct sglist_seg segs[3];
2369 struct sglist sg;
2370 struct {
2371 struct virtio_net_ctrl_hdr hdr __aligned(2);
2372 uint8_t pad1;
2373 uint16_t tag;
2374 uint8_t pad2;
2375 uint8_t ack;
2376 } s;
2377 int error;
2378
2379 s.hdr.class = VIRTIO_NET_CTRL_VLAN;
2380 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
2381 s.tag = tag;
2382 s.ack = VIRTIO_NET_ERR;
2383
2384 sglist_init(&sg, 3, segs);
2385 error = 0;
2386 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
2387 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t));
2388 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
2389 KASSERT(error == 0 && sg.sg_nseg == 3,
2390 ("%s: error %d adding VLAN message to sglist", __func__, error));
2391
2392 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
2393
2394 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
2395 }
2396
2397 static void
2398 vtnet_rx_filter_vlan(struct vtnet_softc *sc)
2399 {
2400 uint32_t w;
2401 uint16_t tag;
2402 int i, bit, nvlans;
2403
2404 ASSERT_SERIALIZED(&sc->vtnet_slz);
2405 KASSERT(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER,
2406 ("%s: VLAN_FILTER feature not negotiated", __func__));
2407
2408 nvlans = sc->vtnet_nvlans;
2409
2410 /* Enable the filter for each configured VLAN. */
2411 for (i = 0; i < VTNET_VLAN_SHADOW_SIZE && nvlans > 0; i++) {
2412 w = sc->vtnet_vlan_shadow[i];
2413 while ((bit = ffs(w) - 1) != -1) {
2414 w &= ~(1 << bit);
2415 tag = sizeof(w) * CHAR_BIT * i + bit;
2416 nvlans--;
2417
2418 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) {
2419 device_printf(sc->vtnet_dev,
2420 "cannot enable VLAN %d filter\n", tag);
2421 }
2422 }
2423 }
2424
2425 KASSERT(nvlans == 0, ("VLAN count incorrect"));
2426 }
2427
2428 static void
2429 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
2430 {
2431 struct ifnet *ifp;
2432 int idx, bit;
2433
2434 ifp = sc->vtnet_ifp;
2435 idx = (tag >> 5) & 0x7F;
2436 bit = tag & 0x1F;
2437
2438 if (tag == 0 || tag > 4095)
2439 return;
2440
2441 lwkt_serialize_enter(&sc->vtnet_slz);
2442
2443 /* Update shadow VLAN table. */
2444 if (add) {
2445 sc->vtnet_nvlans++;
2446 sc->vtnet_vlan_shadow[idx] |= (1 << bit);
2447 } else {
2448 sc->vtnet_nvlans--;
2449 sc->vtnet_vlan_shadow[idx] &= ~(1 << bit);
2450 }
2451
2452 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER &&
2453 vtnet_exec_vlan_filter(sc, add, tag) != 0) {
2454 device_printf(sc->vtnet_dev,
2455 "cannot %s VLAN %d %s the host filter table\n",
2456 add ? "add" : "remove", tag, add ? "to" : "from");
2457 }
2458
2459 lwkt_serialize_exit(&sc->vtnet_slz);
2460 }
2461
2462 static void
2463 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag)
2464 {
2465
2466 if (ifp->if_softc != arg)
2467 return;
2468
2469 vtnet_update_vlan_filter(arg, 1, tag);
2470 }
2471
2472 static void
2473 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag)
2474 {
2475
2476 if (ifp->if_softc != arg)
2477 return;
2478
2479 vtnet_update_vlan_filter(arg, 0, tag);
2480 }
2481
2482 static int
2483 vtnet_ifmedia_upd(struct ifnet *ifp)
2484 {
2485 struct vtnet_softc *sc;
2486 struct ifmedia *ifm;
2487
2488 sc = ifp->if_softc;
2489 ifm = &sc->vtnet_media;
2490
2491 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
2492 return (EINVAL);
2493
2494 return (0);
2495 }
2496
2497 static void
2498 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
2499 {
2500 struct vtnet_softc *sc;
2501
2502 sc = ifp->if_softc;
2503
2504 ifmr->ifm_status = IFM_AVALID;
2505 ifmr->ifm_active = IFM_ETHER;
2506
2507 lwkt_serialize_enter(&sc->vtnet_slz);
2508 if (vtnet_is_link_up(sc) != 0) {
2509 ifmr->ifm_status |= IFM_ACTIVE;
2510 ifmr->ifm_active |= VTNET_MEDIATYPE;
2511 } else
2512 ifmr->ifm_active |= IFM_NONE;
2513 lwkt_serialize_exit(&sc->vtnet_slz);
2514 }
2515
2516 static void
2517 vtnet_add_statistics(struct vtnet_softc *sc)
2518 {
2519 device_t dev;
2520 struct vtnet_statistics *stats;
2521 struct sysctl_ctx_list *ctx;
2522 struct sysctl_oid *tree;
2523 struct sysctl_oid_list *child;
2524
2525 dev = sc->vtnet_dev;
2526 stats = &sc->vtnet_stats;
2527 ctx = device_get_sysctl_ctx(dev);
2528 tree = device_get_sysctl_tree(dev);
2529 child = SYSCTL_CHILDREN(tree);
2530
2531 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed",
2532 CTLFLAG_RD, &stats->mbuf_alloc_failed, 0,
2533 "Mbuf cluster allocation failures");
2534
2535 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large",
2536 CTLFLAG_RD, &stats->rx_frame_too_large, 0,
2537 "Received frame larger than the mbuf chain");
2538 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed",
2539 CTLFLAG_RD, &stats->rx_enq_replacement_failed, 0,
2540 "Enqueuing the replacement receive mbuf failed");
2541 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed",
2542 CTLFLAG_RD, &stats->rx_mergeable_failed, 0,
2543 "Mergeable buffers receive failures");
2544 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype",
2545 CTLFLAG_RD, &stats->rx_csum_bad_ethtype, 0,
2546 "Received checksum offloaded buffer with unsupported "
2547 "Ethernet type");
2548 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto",
2549 CTLFLAG_RD, &stats->rx_csum_bad_ipproto, 0,
2550 "Received checksum offloaded buffer with incorrect IP protocol");
2551 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset",
2552 CTLFLAG_RD, &stats->rx_csum_bad_offset, 0,
2553 "Received checksum offloaded buffer with incorrect offset");
2554 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed",
2555 CTLFLAG_RD, &stats->rx_csum_failed, 0,
2556 "Received buffer checksum offload failed");
2557 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded",
2558 CTLFLAG_RD, &stats->rx_csum_offloaded, 0,
2559 "Received buffer checksum offload succeeded");
2560 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled",
2561 CTLFLAG_RD, &stats->rx_task_rescheduled, 0,
2562 "Times the receive interrupt task rescheduled itself");
2563
2564 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_bad_ethtype",
2565 CTLFLAG_RD, &stats->tx_csum_bad_ethtype, 0,
2566 "Aborted transmit of checksum offloaded buffer with unknown "
2567 "Ethernet type");
2568 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_bad_ethtype",
2569 CTLFLAG_RD, &stats->tx_tso_bad_ethtype, 0,
2570 "Aborted transmit of TSO buffer with unknown Ethernet type");
2571 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged",
2572 CTLFLAG_RD, &stats->tx_defragged, 0,
2573 "Transmit mbufs defragged");
2574 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed",
2575 CTLFLAG_RD, &stats->tx_defrag_failed, 0,
2576 "Aborted transmit of buffer because defrag failed");
2577 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded",
2578 CTLFLAG_RD, &stats->tx_csum_offloaded, 0,
2579 "Offloaded checksum of transmitted buffer");
2580 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded",
2581 CTLFLAG_RD, &stats->tx_tso_offloaded, 0,
2582 "Segmentation offload of transmitted buffer");
2583 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled",
2584 CTLFLAG_RD, &stats->tx_task_rescheduled, 0,
2585 "Times the transmit interrupt task rescheduled itself");
2586 }
2587
2588 static int
2589 vtnet_enable_rx_intr(struct vtnet_softc *sc)
2590 {
2591
2592 return (virtqueue_enable_intr(sc->vtnet_rx_vq));
2593 }
2594
2595 static void
2596 vtnet_disable_rx_intr(struct vtnet_softc *sc)
2597 {
2598
2599 virtqueue_disable_intr(sc->vtnet_rx_vq);
2600 }
2601
2602 static int
2603 vtnet_enable_tx_intr(struct vtnet_softc *sc)
2604 {
2605
2606 #ifdef VTNET_TX_INTR_MODERATION
2607 return (0);
2608 #else
2609 return (virtqueue_enable_intr(sc->vtnet_tx_vq));
2610 #endif
2611 }
2612
2613 static void
2614 vtnet_disable_tx_intr(struct vtnet_softc *sc)
2615 {
2616
2617 virtqueue_disable_intr(sc->vtnet_tx_vq);
2618 }
DragonFly BSD