1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011, Bryan Venteicher <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /* Driver for VirtIO network devices. */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/eventhandler.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/sockio.h>
39 #include <sys/mbuf.h>
40 #include <sys/malloc.h>
41 #include <sys/module.h>
42 #include <sys/socket.h>
43 #include <sys/sysctl.h>
44 #include <sys/random.h>
45 #include <sys/sglist.h>
46 #include <sys/lock.h>
47 #include <sys/mutex.h>
48 #include <sys/taskqueue.h>
49 #include <sys/smp.h>
50 #include <machine/smp.h>
51
52 #include <vm/uma.h>
53
54 #include <net/debugnet.h>
55 #include <net/ethernet.h>
56 #include <net/pfil.h>
57 #include <net/if.h>
58 #include <net/if_var.h>
59 #include <net/if_arp.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
62 #include <net/if_media.h>
63 #include <net/if_vlan_var.h>
64
65 #include <net/bpf.h>
66
67 #include <netinet/in_systm.h>
68 #include <netinet/in.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip6.h>
71 #include <netinet6/ip6_var.h>
72 #include <netinet/udp.h>
73 #include <netinet/tcp.h>
74 #include <netinet/tcp_lro.h>
75
76 #include <machine/bus.h>
77 #include <machine/resource.h>
78 #include <sys/bus.h>
79 #include <sys/rman.h>
80
81 #include <dev/virtio/virtio.h>
82 #include <dev/virtio/virtqueue.h>
83 #include <dev/virtio/network/virtio_net.h>
84 #include <dev/virtio/network/if_vtnetvar.h>
85 #include "virtio_if.h"
86
87 #include "opt_inet.h"
88 #include "opt_inet6.h"
89
90 #if defined(INET) || defined(INET6)
91 #include <machine/in_cksum.h>
92 #endif
93
94 static int vtnet_modevent(module_t, int, void *);
95
96 static int vtnet_probe(device_t);
97 static int vtnet_attach(device_t);
98 static int vtnet_detach(device_t);
99 static int vtnet_suspend(device_t);
100 static int vtnet_resume(device_t);
101 static int vtnet_shutdown(device_t);
102 static int vtnet_attach_completed(device_t);
103 static int vtnet_config_change(device_t);
104
105 static int vtnet_negotiate_features(struct vtnet_softc *);
106 static int vtnet_setup_features(struct vtnet_softc *);
107 static int vtnet_init_rxq(struct vtnet_softc *, int);
108 static int vtnet_init_txq(struct vtnet_softc *, int);
109 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *);
110 static void vtnet_free_rxtx_queues(struct vtnet_softc *);
111 static int vtnet_alloc_rx_filters(struct vtnet_softc *);
112 static void vtnet_free_rx_filters(struct vtnet_softc *);
113 static int vtnet_alloc_virtqueues(struct vtnet_softc *);
114 static int vtnet_alloc_interface(struct vtnet_softc *);
115 static int vtnet_setup_interface(struct vtnet_softc *);
116 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int);
117 static int vtnet_ioctl_ifflags(struct vtnet_softc *);
118 static int vtnet_ioctl_multi(struct vtnet_softc *);
119 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *);
120 static int vtnet_ioctl(struct ifnet *, u_long, caddr_t);
121 static uint64_t vtnet_get_counter(struct ifnet *, ift_counter);
122
123 static int vtnet_rxq_populate(struct vtnet_rxq *);
124 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *);
125 static struct mbuf *
126 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **);
127 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *,
128 struct mbuf *, int);
129 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int);
130 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *);
131 static int vtnet_rxq_new_buf(struct vtnet_rxq *);
132 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *,
133 uint16_t, int, struct virtio_net_hdr *);
134 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *,
135 uint16_t, int, struct virtio_net_hdr *);
136 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *,
137 struct virtio_net_hdr *);
138 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int);
139 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *);
140 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int);
141 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *,
142 struct virtio_net_hdr *);
143 static int vtnet_rxq_eof(struct vtnet_rxq *);
144 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries);
145 static void vtnet_rx_vq_intr(void *);
146 static void vtnet_rxq_tq_intr(void *, int);
147
148 static int vtnet_txq_intr_threshold(struct vtnet_txq *);
149 static int vtnet_txq_below_threshold(struct vtnet_txq *);
150 static int vtnet_txq_notify(struct vtnet_txq *);
151 static void vtnet_txq_free_mbufs(struct vtnet_txq *);
152 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *,
153 int *, int *, int *);
154 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int,
155 int, struct virtio_net_hdr *);
156 static struct mbuf *
157 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *,
158 struct virtio_net_hdr *);
159 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **,
160 struct vtnet_tx_header *);
161 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int);
162 #ifdef VTNET_LEGACY_TX
163 static void vtnet_start_locked(struct vtnet_txq *, struct ifnet *);
164 static void vtnet_start(struct ifnet *);
165 #else
166 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *);
167 static int vtnet_txq_mq_start(struct ifnet *, struct mbuf *);
168 static void vtnet_txq_tq_deferred(void *, int);
169 #endif
170 static void vtnet_txq_start(struct vtnet_txq *);
171 static void vtnet_txq_tq_intr(void *, int);
172 static int vtnet_txq_eof(struct vtnet_txq *);
173 static void vtnet_tx_vq_intr(void *);
174 static void vtnet_tx_start_all(struct vtnet_softc *);
175
176 #ifndef VTNET_LEGACY_TX
177 static void vtnet_qflush(struct ifnet *);
178 #endif
179
180 static int vtnet_watchdog(struct vtnet_txq *);
181 static void vtnet_accum_stats(struct vtnet_softc *,
182 struct vtnet_rxq_stats *, struct vtnet_txq_stats *);
183 static void vtnet_tick(void *);
184
185 static void vtnet_start_taskqueues(struct vtnet_softc *);
186 static void vtnet_free_taskqueues(struct vtnet_softc *);
187 static void vtnet_drain_taskqueues(struct vtnet_softc *);
188
189 static void vtnet_drain_rxtx_queues(struct vtnet_softc *);
190 static void vtnet_stop_rendezvous(struct vtnet_softc *);
191 static void vtnet_stop(struct vtnet_softc *);
192 static int vtnet_virtio_reinit(struct vtnet_softc *);
193 static void vtnet_init_rx_filters(struct vtnet_softc *);
194 static int vtnet_init_rx_queues(struct vtnet_softc *);
195 static int vtnet_init_tx_queues(struct vtnet_softc *);
196 static int vtnet_init_rxtx_queues(struct vtnet_softc *);
197 static void vtnet_set_active_vq_pairs(struct vtnet_softc *);
198 static void vtnet_update_rx_offloads(struct vtnet_softc *);
199 static int vtnet_reinit(struct vtnet_softc *);
200 static void vtnet_init_locked(struct vtnet_softc *, int);
201 static void vtnet_init(void *);
202
203 static void vtnet_free_ctrl_vq(struct vtnet_softc *);
204 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *,
205 struct sglist *, int, int);
206 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *);
207 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t);
208 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t);
209 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool);
210 static int vtnet_set_promisc(struct vtnet_softc *, bool);
211 static int vtnet_set_allmulti(struct vtnet_softc *, bool);
212 static void vtnet_rx_filter(struct vtnet_softc *);
213 static void vtnet_rx_filter_mac(struct vtnet_softc *);
214 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t);
215 static void vtnet_rx_filter_vlan(struct vtnet_softc *);
216 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t);
217 static void vtnet_register_vlan(void *, struct ifnet *, uint16_t);
218 static void vtnet_unregister_vlan(void *, struct ifnet *, uint16_t);
219
220 static void vtnet_update_speed_duplex(struct vtnet_softc *);
221 static int vtnet_is_link_up(struct vtnet_softc *);
222 static void vtnet_update_link_status(struct vtnet_softc *);
223 static int vtnet_ifmedia_upd(struct ifnet *);
224 static void vtnet_ifmedia_sts(struct ifnet *, struct ifmediareq *);
225 static void vtnet_get_macaddr(struct vtnet_softc *);
226 static void vtnet_set_macaddr(struct vtnet_softc *);
227 static void vtnet_attached_set_macaddr(struct vtnet_softc *);
228 static void vtnet_vlan_tag_remove(struct mbuf *);
229 static void vtnet_set_rx_process_limit(struct vtnet_softc *);
230
231 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *,
232 struct sysctl_oid_list *, struct vtnet_rxq *);
233 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *,
234 struct sysctl_oid_list *, struct vtnet_txq *);
235 static void vtnet_setup_queue_sysctl(struct vtnet_softc *);
236 static void vtnet_load_tunables(struct vtnet_softc *);
237 static void vtnet_setup_sysctl(struct vtnet_softc *);
238
239 static int vtnet_rxq_enable_intr(struct vtnet_rxq *);
240 static void vtnet_rxq_disable_intr(struct vtnet_rxq *);
241 static int vtnet_txq_enable_intr(struct vtnet_txq *);
242 static void vtnet_txq_disable_intr(struct vtnet_txq *);
243 static void vtnet_enable_rx_interrupts(struct vtnet_softc *);
244 static void vtnet_enable_tx_interrupts(struct vtnet_softc *);
245 static void vtnet_enable_interrupts(struct vtnet_softc *);
246 static void vtnet_disable_rx_interrupts(struct vtnet_softc *);
247 static void vtnet_disable_tx_interrupts(struct vtnet_softc *);
248 static void vtnet_disable_interrupts(struct vtnet_softc *);
249
250 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int);
251
252 DEBUGNET_DEFINE(vtnet);
253
254 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val)
255 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val)
256 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val)
257 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val)
258 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val)
259 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val)
260
261 /* Tunables. */
262 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
263 "VirtIO Net driver parameters");
264
265 static int vtnet_csum_disable = 0;
266 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN,
267 &vtnet_csum_disable, 0, "Disables receive and send checksum offload");
268
269 static int vtnet_fixup_needs_csum = 0;
270 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN,
271 &vtnet_fixup_needs_csum, 0,
272 "Calculate valid checksum for NEEDS_CSUM packets");
273
274 static int vtnet_tso_disable = 0;
275 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN,
276 &vtnet_tso_disable, 0, "Disables TSO");
277
278 static int vtnet_lro_disable = 0;
279 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN,
280 &vtnet_lro_disable, 0, "Disables hardware LRO");
281
282 static int vtnet_mq_disable = 0;
283 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN,
284 &vtnet_mq_disable, 0, "Disables multiqueue support");
285
286 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS;
287 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN,
288 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs");
289
290 static int vtnet_tso_maxlen = IP_MAXPACKET;
291 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN,
292 &vtnet_tso_maxlen, 0, "TSO burst limit");
293
294 static int vtnet_rx_process_limit = 1024;
295 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN,
296 &vtnet_rx_process_limit, 0,
297 "Number of RX segments processed in one pass");
298
299 static int vtnet_lro_entry_count = 128;
300 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN,
301 &vtnet_lro_entry_count, 0, "Software LRO entry count");
302
303 /* Enable sorted LRO, and the depth of the mbuf queue. */
304 static int vtnet_lro_mbufq_depth = 0;
305 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN,
306 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue");
307
308 static uma_zone_t vtnet_tx_header_zone;
309
310 static struct virtio_feature_desc vtnet_feature_desc[] = {
311 { VIRTIO_NET_F_CSUM, "TxChecksum" },
312 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" },
313 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" },
314 { VIRTIO_NET_F_MAC, "MAC" },
315 { VIRTIO_NET_F_GSO, "TxGSO" },
316 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" },
317 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" },
318 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" },
319 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" },
320 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" },
321 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" },
322 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" },
323 { VIRTIO_NET_F_HOST_UFO, "TxUFO" },
324 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" },
325 { VIRTIO_NET_F_STATUS, "Status" },
326 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" },
327 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" },
328 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" },
329 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" },
330 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" },
331 { VIRTIO_NET_F_MQ, "Multiqueue" },
332 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" },
333 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" },
334
335 { 0, NULL }
336 };
337
338 static device_method_t vtnet_methods[] = {
339 /* Device methods. */
340 DEVMETHOD(device_probe, vtnet_probe),
341 DEVMETHOD(device_attach, vtnet_attach),
342 DEVMETHOD(device_detach, vtnet_detach),
343 DEVMETHOD(device_suspend, vtnet_suspend),
344 DEVMETHOD(device_resume, vtnet_resume),
345 DEVMETHOD(device_shutdown, vtnet_shutdown),
346
347 /* VirtIO methods. */
348 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed),
349 DEVMETHOD(virtio_config_change, vtnet_config_change),
350
351 DEVMETHOD_END
352 };
353
354 #ifdef DEV_NETMAP
355 #include <dev/netmap/if_vtnet_netmap.h>
356 #endif
357
358 static driver_t vtnet_driver = {
359 .name = "vtnet",
360 .methods = vtnet_methods,
361 .size = sizeof(struct vtnet_softc)
362 };
363 static devclass_t vtnet_devclass;
364
365 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_devclass,
366 vtnet_modevent, 0);
367 MODULE_VERSION(vtnet, 1);
368 MODULE_DEPEND(vtnet, virtio, 1, 1, 1);
369 #ifdef DEV_NETMAP
370 MODULE_DEPEND(vtnet, netmap, 1, 1, 1);
371 #endif
372
373 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter");
374
375 static int
vtnet_modevent(module_t mod __unused,int type,void * unused __unused)376 vtnet_modevent(module_t mod __unused, int type, void *unused __unused)
377 {
378 int error = 0;
379 static int loaded = 0;
380
381 switch (type) {
382 case MOD_LOAD:
383 if (loaded++ == 0) {
384 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr",
385 sizeof(struct vtnet_tx_header),
386 NULL, NULL, NULL, NULL, 0, 0);
387 #ifdef DEBUGNET
388 /*
389 * We need to allocate from this zone in the transmit path, so ensure
390 * that we have at least one item per header available.
391 * XXX add a separate zone like we do for mbufs? otherwise we may alloc
392 * buckets
393 */
394 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
395 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
396 #endif
397 }
398 break;
399 case MOD_QUIESCE:
400 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0)
401 error = EBUSY;
402 break;
403 case MOD_UNLOAD:
404 if (--loaded == 0) {
405 uma_zdestroy(vtnet_tx_header_zone);
406 vtnet_tx_header_zone = NULL;
407 }
408 break;
409 case MOD_SHUTDOWN:
410 break;
411 default:
412 error = EOPNOTSUPP;
413 break;
414 }
415
416 return (error);
417 }
418
419 static int
vtnet_probe(device_t dev)420 vtnet_probe(device_t dev)
421 {
422 return (VIRTIO_SIMPLE_PROBE(dev, vtnet));
423 }
424
425 static int
vtnet_attach(device_t dev)426 vtnet_attach(device_t dev)
427 {
428 struct vtnet_softc *sc;
429 int error;
430
431 sc = device_get_softc(dev);
432 sc->vtnet_dev = dev;
433 virtio_set_feature_desc(dev, vtnet_feature_desc);
434
435 VTNET_CORE_LOCK_INIT(sc);
436 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0);
437 vtnet_load_tunables(sc);
438
439 error = vtnet_alloc_interface(sc);
440 if (error) {
441 device_printf(dev, "cannot allocate interface\n");
442 goto fail;
443 }
444
445 vtnet_setup_sysctl(sc);
446
447 error = vtnet_setup_features(sc);
448 if (error) {
449 device_printf(dev, "cannot setup features\n");
450 goto fail;
451 }
452
453 error = vtnet_alloc_rx_filters(sc);
454 if (error) {
455 device_printf(dev, "cannot allocate Rx filters\n");
456 goto fail;
457 }
458
459 error = vtnet_alloc_rxtx_queues(sc);
460 if (error) {
461 device_printf(dev, "cannot allocate queues\n");
462 goto fail;
463 }
464
465 error = vtnet_alloc_virtqueues(sc);
466 if (error) {
467 device_printf(dev, "cannot allocate virtqueues\n");
468 goto fail;
469 }
470
471 error = vtnet_setup_interface(sc);
472 if (error) {
473 device_printf(dev, "cannot setup interface\n");
474 goto fail;
475 }
476
477 error = virtio_setup_intr(dev, INTR_TYPE_NET);
478 if (error) {
479 device_printf(dev, "cannot setup interrupts\n");
480 ether_ifdetach(sc->vtnet_ifp);
481 goto fail;
482 }
483
484 #ifdef DEV_NETMAP
485 vtnet_netmap_attach(sc);
486 #endif
487 vtnet_start_taskqueues(sc);
488
489 fail:
490 if (error)
491 vtnet_detach(dev);
492
493 return (error);
494 }
495
496 static int
vtnet_detach(device_t dev)497 vtnet_detach(device_t dev)
498 {
499 struct vtnet_softc *sc;
500 struct ifnet *ifp;
501
502 sc = device_get_softc(dev);
503 ifp = sc->vtnet_ifp;
504
505 if (device_is_attached(dev)) {
506 VTNET_CORE_LOCK(sc);
507 vtnet_stop(sc);
508 VTNET_CORE_UNLOCK(sc);
509
510 callout_drain(&sc->vtnet_tick_ch);
511 vtnet_drain_taskqueues(sc);
512
513 ether_ifdetach(ifp);
514 }
515
516 #ifdef DEV_NETMAP
517 netmap_detach(ifp);
518 #endif
519
520 vtnet_free_taskqueues(sc);
521
522 if (sc->vtnet_vlan_attach != NULL) {
523 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach);
524 sc->vtnet_vlan_attach = NULL;
525 }
526 if (sc->vtnet_vlan_detach != NULL) {
527 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach);
528 sc->vtnet_vlan_detach = NULL;
529 }
530
531 ifmedia_removeall(&sc->vtnet_media);
532
533 if (ifp != NULL) {
534 if_free(ifp);
535 sc->vtnet_ifp = NULL;
536 }
537
538 vtnet_free_rxtx_queues(sc);
539 vtnet_free_rx_filters(sc);
540
541 if (sc->vtnet_ctrl_vq != NULL)
542 vtnet_free_ctrl_vq(sc);
543
544 VTNET_CORE_LOCK_DESTROY(sc);
545
546 return (0);
547 }
548
549 static int
vtnet_suspend(device_t dev)550 vtnet_suspend(device_t dev)
551 {
552 struct vtnet_softc *sc;
553
554 sc = device_get_softc(dev);
555
556 VTNET_CORE_LOCK(sc);
557 vtnet_stop(sc);
558 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED;
559 VTNET_CORE_UNLOCK(sc);
560
561 return (0);
562 }
563
564 static int
vtnet_resume(device_t dev)565 vtnet_resume(device_t dev)
566 {
567 struct vtnet_softc *sc;
568 struct ifnet *ifp;
569
570 sc = device_get_softc(dev);
571 ifp = sc->vtnet_ifp;
572
573 VTNET_CORE_LOCK(sc);
574 if (ifp->if_flags & IFF_UP)
575 vtnet_init_locked(sc, 0);
576 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED;
577 VTNET_CORE_UNLOCK(sc);
578
579 return (0);
580 }
581
582 static int
vtnet_shutdown(device_t dev)583 vtnet_shutdown(device_t dev)
584 {
585 /*
586 * Suspend already does all of what we need to
587 * do here; we just never expect to be resumed.
588 */
589 return (vtnet_suspend(dev));
590 }
591
592 static int
vtnet_attach_completed(device_t dev)593 vtnet_attach_completed(device_t dev)
594 {
595 struct vtnet_softc *sc;
596
597 sc = device_get_softc(dev);
598
599 VTNET_CORE_LOCK(sc);
600 vtnet_attached_set_macaddr(sc);
601 VTNET_CORE_UNLOCK(sc);
602
603 return (0);
604 }
605
606 static int
vtnet_config_change(device_t dev)607 vtnet_config_change(device_t dev)
608 {
609 struct vtnet_softc *sc;
610
611 sc = device_get_softc(dev);
612
613 VTNET_CORE_LOCK(sc);
614 vtnet_update_link_status(sc);
615 if (sc->vtnet_link_active != 0)
616 vtnet_tx_start_all(sc);
617 VTNET_CORE_UNLOCK(sc);
618
619 return (0);
620 }
621
622 static int
vtnet_negotiate_features(struct vtnet_softc * sc)623 vtnet_negotiate_features(struct vtnet_softc *sc)
624 {
625 device_t dev;
626 uint64_t features, negotiated_features;
627 int no_csum;
628
629 dev = sc->vtnet_dev;
630 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES :
631 VTNET_LEGACY_FEATURES;
632
633 /*
634 * TSO and LRO are only available when their corresponding checksum
635 * offload feature is also negotiated.
636 */
637 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable);
638 if (no_csum)
639 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM);
640 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable))
641 features &= ~VTNET_TSO_FEATURES;
642 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable))
643 features &= ~VTNET_LRO_FEATURES;
644
645 #ifndef VTNET_LEGACY_TX
646 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable))
647 features &= ~VIRTIO_NET_F_MQ;
648 #else
649 features &= ~VIRTIO_NET_F_MQ;
650 #endif
651
652 negotiated_features = virtio_negotiate_features(dev, features);
653
654 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
655 uint16_t mtu;
656
657 mtu = virtio_read_dev_config_2(dev,
658 offsetof(struct virtio_net_config, mtu));
659 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) {
660 device_printf(dev, "Invalid MTU value: %d. "
661 "MTU feature disabled.\n", mtu);
662 features &= ~VIRTIO_NET_F_MTU;
663 negotiated_features =
664 virtio_negotiate_features(dev, features);
665 }
666 }
667
668 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
669 uint16_t npairs;
670
671 npairs = virtio_read_dev_config_2(dev,
672 offsetof(struct virtio_net_config, max_virtqueue_pairs));
673 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
674 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) {
675 device_printf(dev, "Invalid max_virtqueue_pairs value: "
676 "%d. Multiqueue feature disabled.\n", npairs);
677 features &= ~VIRTIO_NET_F_MQ;
678 negotiated_features =
679 virtio_negotiate_features(dev, features);
680 }
681 }
682
683 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) &&
684 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) {
685 /*
686 * LRO without mergeable buffers requires special care. This
687 * is not ideal because every receive buffer must be large
688 * enough to hold the maximum TCP packet, the Ethernet header,
689 * and the header. This requires up to 34 descriptors with
690 * MCLBYTES clusters. If we do not have indirect descriptors,
691 * LRO is disabled since the virtqueue will not contain very
692 * many receive buffers.
693 */
694 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) {
695 device_printf(dev,
696 "Host LRO disabled since both mergeable buffers "
697 "and indirect descriptors were not negotiated\n");
698 features &= ~VTNET_LRO_FEATURES;
699 negotiated_features =
700 virtio_negotiate_features(dev, features);
701 } else
702 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG;
703 }
704
705 sc->vtnet_features = negotiated_features;
706 sc->vtnet_negotiated_features = negotiated_features;
707
708 return (virtio_finalize_features(dev));
709 }
710
711 static int
vtnet_setup_features(struct vtnet_softc * sc)712 vtnet_setup_features(struct vtnet_softc *sc)
713 {
714 device_t dev;
715 int error;
716
717 dev = sc->vtnet_dev;
718
719 error = vtnet_negotiate_features(sc);
720 if (error)
721 return (error);
722
723 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1))
724 sc->vtnet_flags |= VTNET_FLAG_MODERN;
725 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC))
726 sc->vtnet_flags |= VTNET_FLAG_INDIRECT;
727 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX))
728 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX;
729
730 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) {
731 /* This feature should always be negotiated. */
732 sc->vtnet_flags |= VTNET_FLAG_MAC;
733 }
734
735 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
736 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev,
737 offsetof(struct virtio_net_config, mtu));
738 } else
739 sc->vtnet_max_mtu = VTNET_MAX_MTU;
740
741 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) {
742 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS;
743 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
744 } else if (vtnet_modern(sc)) {
745 /* This is identical to the mergeable header. */
746 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1);
747 } else
748 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
749
750 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
751 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE;
752 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
753 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG;
754 else
755 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE;
756
757 /*
758 * Favor "hardware" LRO if negotiated, but support software LRO as
759 * a fallback; there is usually little benefit (or worse) with both.
760 */
761 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 &&
762 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0)
763 sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
764
765 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) ||
766 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) ||
767 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
768 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX;
769 else
770 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN;
771
772 sc->vtnet_req_vq_pairs = 1;
773 sc->vtnet_max_vq_pairs = 1;
774
775 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
776 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ;
777
778 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
779 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX;
780 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN))
781 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER;
782 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR))
783 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC;
784
785 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
786 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev,
787 offsetof(struct virtio_net_config,
788 max_virtqueue_pairs));
789 }
790 }
791
792 if (sc->vtnet_max_vq_pairs > 1) {
793 int req;
794
795 /*
796 * Limit the maximum number of requested queue pairs to the
797 * number of CPUs and the configured maximum.
798 */
799 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs);
800 if (req < 0)
801 req = 1;
802 if (req == 0)
803 req = mp_ncpus;
804 if (req > sc->vtnet_max_vq_pairs)
805 req = sc->vtnet_max_vq_pairs;
806 if (req > mp_ncpus)
807 req = mp_ncpus;
808 if (req > 1) {
809 sc->vtnet_req_vq_pairs = req;
810 sc->vtnet_flags |= VTNET_FLAG_MQ;
811 }
812 }
813
814 return (0);
815 }
816
817 static int
vtnet_init_rxq(struct vtnet_softc * sc,int id)818 vtnet_init_rxq(struct vtnet_softc *sc, int id)
819 {
820 struct vtnet_rxq *rxq;
821
822 rxq = &sc->vtnet_rxqs[id];
823
824 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d",
825 device_get_nameunit(sc->vtnet_dev), id);
826 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF);
827
828 rxq->vtnrx_sc = sc;
829 rxq->vtnrx_id = id;
830
831 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT);
832 if (rxq->vtnrx_sg == NULL)
833 return (ENOMEM);
834
835 #if defined(INET) || defined(INET6)
836 if (vtnet_software_lro(sc)) {
837 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp,
838 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0)
839 return (ENOMEM);
840 }
841 #endif
842
843 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq);
844 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT,
845 taskqueue_thread_enqueue, &rxq->vtnrx_tq);
846
847 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0);
848 }
849
850 static int
vtnet_init_txq(struct vtnet_softc * sc,int id)851 vtnet_init_txq(struct vtnet_softc *sc, int id)
852 {
853 struct vtnet_txq *txq;
854
855 txq = &sc->vtnet_txqs[id];
856
857 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d",
858 device_get_nameunit(sc->vtnet_dev), id);
859 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF);
860
861 txq->vtntx_sc = sc;
862 txq->vtntx_id = id;
863
864 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT);
865 if (txq->vtntx_sg == NULL)
866 return (ENOMEM);
867
868 #ifndef VTNET_LEGACY_TX
869 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF,
870 M_NOWAIT, &txq->vtntx_mtx);
871 if (txq->vtntx_br == NULL)
872 return (ENOMEM);
873
874 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq);
875 #endif
876 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq);
877 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT,
878 taskqueue_thread_enqueue, &txq->vtntx_tq);
879 if (txq->vtntx_tq == NULL)
880 return (ENOMEM);
881
882 return (0);
883 }
884
885 static int
vtnet_alloc_rxtx_queues(struct vtnet_softc * sc)886 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc)
887 {
888 int i, npairs, error;
889
890 npairs = sc->vtnet_max_vq_pairs;
891
892 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF,
893 M_NOWAIT | M_ZERO);
894 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF,
895 M_NOWAIT | M_ZERO);
896 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL)
897 return (ENOMEM);
898
899 for (i = 0; i < npairs; i++) {
900 error = vtnet_init_rxq(sc, i);
901 if (error)
902 return (error);
903 error = vtnet_init_txq(sc, i);
904 if (error)
905 return (error);
906 }
907
908 vtnet_set_rx_process_limit(sc);
909 vtnet_setup_queue_sysctl(sc);
910
911 return (0);
912 }
913
914 static void
vtnet_destroy_rxq(struct vtnet_rxq * rxq)915 vtnet_destroy_rxq(struct vtnet_rxq *rxq)
916 {
917
918 rxq->vtnrx_sc = NULL;
919 rxq->vtnrx_id = -1;
920
921 #if defined(INET) || defined(INET6)
922 tcp_lro_free(&rxq->vtnrx_lro);
923 #endif
924
925 if (rxq->vtnrx_sg != NULL) {
926 sglist_free(rxq->vtnrx_sg);
927 rxq->vtnrx_sg = NULL;
928 }
929
930 if (mtx_initialized(&rxq->vtnrx_mtx) != 0)
931 mtx_destroy(&rxq->vtnrx_mtx);
932 }
933
934 static void
vtnet_destroy_txq(struct vtnet_txq * txq)935 vtnet_destroy_txq(struct vtnet_txq *txq)
936 {
937
938 txq->vtntx_sc = NULL;
939 txq->vtntx_id = -1;
940
941 if (txq->vtntx_sg != NULL) {
942 sglist_free(txq->vtntx_sg);
943 txq->vtntx_sg = NULL;
944 }
945
946 #ifndef VTNET_LEGACY_TX
947 if (txq->vtntx_br != NULL) {
948 buf_ring_free(txq->vtntx_br, M_DEVBUF);
949 txq->vtntx_br = NULL;
950 }
951 #endif
952
953 if (mtx_initialized(&txq->vtntx_mtx) != 0)
954 mtx_destroy(&txq->vtntx_mtx);
955 }
956
957 static void
vtnet_free_rxtx_queues(struct vtnet_softc * sc)958 vtnet_free_rxtx_queues(struct vtnet_softc *sc)
959 {
960 int i;
961
962 if (sc->vtnet_rxqs != NULL) {
963 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
964 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]);
965 free(sc->vtnet_rxqs, M_DEVBUF);
966 sc->vtnet_rxqs = NULL;
967 }
968
969 if (sc->vtnet_txqs != NULL) {
970 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
971 vtnet_destroy_txq(&sc->vtnet_txqs[i]);
972 free(sc->vtnet_txqs, M_DEVBUF);
973 sc->vtnet_txqs = NULL;
974 }
975 }
976
977 static int
vtnet_alloc_rx_filters(struct vtnet_softc * sc)978 vtnet_alloc_rx_filters(struct vtnet_softc *sc)
979 {
980
981 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
982 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter),
983 M_DEVBUF, M_NOWAIT | M_ZERO);
984 if (sc->vtnet_mac_filter == NULL)
985 return (ENOMEM);
986 }
987
988 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
989 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) *
990 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO);
991 if (sc->vtnet_vlan_filter == NULL)
992 return (ENOMEM);
993 }
994
995 return (0);
996 }
997
998 static void
vtnet_free_rx_filters(struct vtnet_softc * sc)999 vtnet_free_rx_filters(struct vtnet_softc *sc)
1000 {
1001
1002 if (sc->vtnet_mac_filter != NULL) {
1003 free(sc->vtnet_mac_filter, M_DEVBUF);
1004 sc->vtnet_mac_filter = NULL;
1005 }
1006
1007 if (sc->vtnet_vlan_filter != NULL) {
1008 free(sc->vtnet_vlan_filter, M_DEVBUF);
1009 sc->vtnet_vlan_filter = NULL;
1010 }
1011 }
1012
1013 static int
vtnet_alloc_virtqueues(struct vtnet_softc * sc)1014 vtnet_alloc_virtqueues(struct vtnet_softc *sc)
1015 {
1016 device_t dev;
1017 struct vq_alloc_info *info;
1018 struct vtnet_rxq *rxq;
1019 struct vtnet_txq *txq;
1020 int i, idx, flags, nvqs, error;
1021
1022 dev = sc->vtnet_dev;
1023 flags = 0;
1024
1025 nvqs = sc->vtnet_max_vq_pairs * 2;
1026 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
1027 nvqs++;
1028
1029 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT);
1030 if (info == NULL)
1031 return (ENOMEM);
1032
1033 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) {
1034 rxq = &sc->vtnet_rxqs[i];
1035 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs,
1036 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq,
1037 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id);
1038
1039 txq = &sc->vtnet_txqs[i];
1040 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs,
1041 vtnet_tx_vq_intr, txq, &txq->vtntx_vq,
1042 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id);
1043 }
1044
1045 /* These queues will not be used so allocate the minimum resources. */
1046 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) {
1047 rxq = &sc->vtnet_rxqs[i];
1048 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq,
1049 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id);
1050
1051 txq = &sc->vtnet_txqs[i];
1052 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq,
1053 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id);
1054 }
1055
1056 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
1057 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL,
1058 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev));
1059 }
1060
1061 /*
1062 * TODO: Enable interrupt binding if this is multiqueue. This will
1063 * only matter when per-virtqueue MSIX is available.
1064 */
1065 if (sc->vtnet_flags & VTNET_FLAG_MQ)
1066 flags |= 0;
1067
1068 error = virtio_alloc_virtqueues(dev, flags, nvqs, info);
1069 free(info, M_TEMP);
1070
1071 return (error);
1072 }
1073
1074 static int
vtnet_alloc_interface(struct vtnet_softc * sc)1075 vtnet_alloc_interface(struct vtnet_softc *sc)
1076 {
1077 device_t dev;
1078 struct ifnet *ifp;
1079
1080 dev = sc->vtnet_dev;
1081
1082 ifp = if_alloc(IFT_ETHER);
1083 if (ifp == NULL)
1084 return (ENOMEM);
1085
1086 sc->vtnet_ifp = ifp;
1087 ifp->if_softc = sc;
1088 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
1089
1090 return (0);
1091 }
1092
1093 static int
vtnet_setup_interface(struct vtnet_softc * sc)1094 vtnet_setup_interface(struct vtnet_softc *sc)
1095 {
1096 device_t dev;
1097 struct pfil_head_args pa;
1098 struct ifnet *ifp;
1099
1100 dev = sc->vtnet_dev;
1101 ifp = sc->vtnet_ifp;
1102
1103 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST |
1104 IFF_KNOWSEPOCH;
1105 ifp->if_baudrate = IF_Gbps(10);
1106 ifp->if_init = vtnet_init;
1107 ifp->if_ioctl = vtnet_ioctl;
1108 ifp->if_get_counter = vtnet_get_counter;
1109 #ifndef VTNET_LEGACY_TX
1110 ifp->if_transmit = vtnet_txq_mq_start;
1111 ifp->if_qflush = vtnet_qflush;
1112 #else
1113 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq;
1114 ifp->if_start = vtnet_start;
1115 IFQ_SET_MAXLEN(&ifp->if_snd, virtqueue_size(vq) - 1);
1116 ifp->if_snd.ifq_drv_maxlen = virtqueue_size(vq) - 1;
1117 IFQ_SET_READY(&ifp->if_snd);
1118 #endif
1119
1120 vtnet_get_macaddr(sc);
1121
1122 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS))
1123 ifp->if_capabilities |= IFCAP_LINKSTATE;
1124
1125 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts);
1126 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL);
1127 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO);
1128
1129 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) {
1130 int gso;
1131
1132 ifp->if_capabilities |= IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6;
1133
1134 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO);
1135 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4))
1136 ifp->if_capabilities |= IFCAP_TSO4;
1137 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
1138 ifp->if_capabilities |= IFCAP_TSO6;
1139 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN))
1140 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN;
1141
1142 if (ifp->if_capabilities & (IFCAP_TSO4 | IFCAP_TSO6)) {
1143 int tso_maxlen;
1144
1145 ifp->if_capabilities |= IFCAP_VLAN_HWTSO;
1146
1147 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen",
1148 vtnet_tso_maxlen);
1149 ifp->if_hw_tsomax = tso_maxlen -
1150 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN);
1151 ifp->if_hw_tsomaxsegcount = sc->vtnet_tx_nsegs - 1;
1152 ifp->if_hw_tsomaxsegsize = PAGE_SIZE;
1153 }
1154 }
1155
1156 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) {
1157 ifp->if_capabilities |= IFCAP_RXCSUM;
1158 #ifdef notyet
1159 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */
1160 ifp->if_capabilities |= IFCAP_RXCSUM_IPV6;
1161 #endif
1162
1163 if (vtnet_tunable_int(sc, "fixup_needs_csum",
1164 vtnet_fixup_needs_csum) != 0)
1165 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM;
1166
1167 /* Support either "hardware" or software LRO. */
1168 ifp->if_capabilities |= IFCAP_LRO;
1169 }
1170
1171 if (ifp->if_capabilities & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) {
1172 /*
1173 * VirtIO does not support VLAN tagging, but we can fake
1174 * it by inserting and removing the 802.1Q header during
1175 * transmit and receive. We are then able to do checksum
1176 * offloading of VLAN frames.
1177 */
1178 ifp->if_capabilities |=
1179 IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM;
1180 }
1181
1182 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO)
1183 ifp->if_capabilities |= IFCAP_JUMBO_MTU;
1184 ifp->if_capabilities |= IFCAP_VLAN_MTU;
1185
1186 /*
1187 * Capabilities after here are not enabled by default.
1188 */
1189 ifp->if_capenable = ifp->if_capabilities;
1190
1191 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
1192 ifp->if_capabilities |= IFCAP_VLAN_HWFILTER;
1193
1194 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
1195 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
1196 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
1197 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
1198 }
1199
1200 ether_ifattach(ifp, sc->vtnet_hwaddr);
1201
1202 /* Tell the upper layer(s) we support long frames. */
1203 ifp->if_hdrlen = sizeof(struct ether_vlan_header);
1204
1205 DEBUGNET_SET(ifp, vtnet);
1206
1207 pa.pa_version = PFIL_VERSION;
1208 pa.pa_flags = PFIL_IN;
1209 pa.pa_type = PFIL_TYPE_ETHERNET;
1210 pa.pa_headname = ifp->if_xname;
1211 sc->vtnet_pfil = pfil_head_register(&pa);
1212
1213 return (0);
1214 }
1215
1216 static int
vtnet_rx_cluster_size(struct vtnet_softc * sc,int mtu)1217 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu)
1218 {
1219 int framesz;
1220
1221 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
1222 return (MJUMPAGESIZE);
1223 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1224 return (MCLBYTES);
1225
1226 /*
1227 * Try to scale the receive mbuf cluster size from the MTU. We
1228 * could also use the VQ size to influence the selected size,
1229 * but that would only matter for very small queues.
1230 */
1231 if (vtnet_modern(sc)) {
1232 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1));
1233 framesz = sizeof(struct virtio_net_hdr_v1);
1234 } else
1235 framesz = sizeof(struct vtnet_rx_header);
1236 framesz += sizeof(struct ether_vlan_header) + mtu;
1237
1238 if (framesz <= MCLBYTES)
1239 return (MCLBYTES);
1240 else if (framesz <= MJUMPAGESIZE)
1241 return (MJUMPAGESIZE);
1242 else if (framesz <= MJUM9BYTES)
1243 return (MJUM9BYTES);
1244
1245 /* Sane default; avoid 16KB clusters. */
1246 return (MCLBYTES);
1247 }
1248
1249 static int
vtnet_ioctl_mtu(struct vtnet_softc * sc,u_int mtu)1250 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu)
1251 {
1252 struct ifnet *ifp;
1253 int clustersz;
1254
1255 ifp = sc->vtnet_ifp;
1256 VTNET_CORE_LOCK_ASSERT(sc);
1257
1258 if (ifp->if_mtu == mtu)
1259 return (0);
1260 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu)
1261 return (EINVAL);
1262
1263 ifp->if_mtu = mtu;
1264 clustersz = vtnet_rx_cluster_size(sc, mtu);
1265
1266 if (clustersz != sc->vtnet_rx_clustersz &&
1267 ifp->if_drv_flags & IFF_DRV_RUNNING) {
1268 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1269 vtnet_init_locked(sc, 0);
1270 }
1271
1272 return (0);
1273 }
1274
1275 static int
vtnet_ioctl_ifflags(struct vtnet_softc * sc)1276 vtnet_ioctl_ifflags(struct vtnet_softc *sc)
1277 {
1278 struct ifnet *ifp;
1279 int drv_running;
1280
1281 ifp = sc->vtnet_ifp;
1282 drv_running = (ifp->if_drv_flags & IFF_DRV_RUNNING) != 0;
1283
1284 VTNET_CORE_LOCK_ASSERT(sc);
1285
1286 if ((ifp->if_flags & IFF_UP) == 0) {
1287 if (drv_running)
1288 vtnet_stop(sc);
1289 goto out;
1290 }
1291
1292 if (!drv_running) {
1293 vtnet_init_locked(sc, 0);
1294 goto out;
1295 }
1296
1297 if ((ifp->if_flags ^ sc->vtnet_if_flags) &
1298 (IFF_PROMISC | IFF_ALLMULTI)) {
1299 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
1300 vtnet_rx_filter(sc);
1301 else {
1302 if ((ifp->if_flags ^ sc->vtnet_if_flags) & IFF_ALLMULTI)
1303 return (ENOTSUP);
1304 ifp->if_flags |= IFF_PROMISC;
1305 }
1306 }
1307
1308 out:
1309 sc->vtnet_if_flags = ifp->if_flags;
1310 return (0);
1311 }
1312
1313 static int
vtnet_ioctl_multi(struct vtnet_softc * sc)1314 vtnet_ioctl_multi(struct vtnet_softc *sc)
1315 {
1316 struct ifnet *ifp;
1317
1318 ifp = sc->vtnet_ifp;
1319
1320 VTNET_CORE_LOCK_ASSERT(sc);
1321
1322 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX &&
1323 ifp->if_drv_flags & IFF_DRV_RUNNING)
1324 vtnet_rx_filter_mac(sc);
1325
1326 return (0);
1327 }
1328
1329 static int
vtnet_ioctl_ifcap(struct vtnet_softc * sc,struct ifreq * ifr)1330 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr)
1331 {
1332 struct ifnet *ifp;
1333 int mask, reinit, update;
1334
1335 ifp = sc->vtnet_ifp;
1336 mask = (ifr->ifr_reqcap & ifp->if_capabilities) ^ ifp->if_capenable;
1337 reinit = update = 0;
1338
1339 VTNET_CORE_LOCK_ASSERT(sc);
1340
1341 if (mask & IFCAP_TXCSUM)
1342 ifp->if_capenable ^= IFCAP_TXCSUM;
1343 if (mask & IFCAP_TXCSUM_IPV6)
1344 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6;
1345 if (mask & IFCAP_TSO4)
1346 ifp->if_capenable ^= IFCAP_TSO4;
1347 if (mask & IFCAP_TSO6)
1348 ifp->if_capenable ^= IFCAP_TSO6;
1349
1350 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) {
1351 /*
1352 * These Rx features require the negotiated features to
1353 * be updated. Avoid a full reinit if possible.
1354 */
1355 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
1356 update = 1;
1357 else
1358 reinit = 1;
1359
1360 /* BMV: Avoid needless renegotiation for just software LRO. */
1361 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) ==
1362 IFCAP_LRO && vtnet_software_lro(sc))
1363 reinit = update = 0;
1364
1365 if (mask & IFCAP_RXCSUM)
1366 ifp->if_capenable ^= IFCAP_RXCSUM;
1367 if (mask & IFCAP_RXCSUM_IPV6)
1368 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6;
1369 if (mask & IFCAP_LRO)
1370 ifp->if_capenable ^= IFCAP_LRO;
1371
1372 /*
1373 * VirtIO does not distinguish between IPv4 and IPv6 checksums
1374 * so treat them as a pair. Guest TSO (LRO) requires receive
1375 * checksums.
1376 */
1377 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
1378 ifp->if_capenable |= IFCAP_RXCSUM;
1379 #ifdef notyet
1380 ifp->if_capenable |= IFCAP_RXCSUM_IPV6;
1381 #endif
1382 } else
1383 ifp->if_capenable &=
1384 ~(IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO);
1385 }
1386
1387 if (mask & IFCAP_VLAN_HWFILTER) {
1388 /* These Rx features require renegotiation. */
1389 reinit = 1;
1390
1391 if (mask & IFCAP_VLAN_HWFILTER)
1392 ifp->if_capenable ^= IFCAP_VLAN_HWFILTER;
1393 }
1394
1395 if (mask & IFCAP_VLAN_HWTSO)
1396 ifp->if_capenable ^= IFCAP_VLAN_HWTSO;
1397 if (mask & IFCAP_VLAN_HWTAGGING)
1398 ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING;
1399
1400 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1401 if (reinit) {
1402 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1403 vtnet_init_locked(sc, 0);
1404 } else if (update)
1405 vtnet_update_rx_offloads(sc);
1406 }
1407
1408 return (0);
1409 }
1410
1411 static int
vtnet_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)1412 vtnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1413 {
1414 struct vtnet_softc *sc;
1415 struct ifreq *ifr;
1416 int error;
1417
1418 sc = ifp->if_softc;
1419 ifr = (struct ifreq *) data;
1420 error = 0;
1421
1422 switch (cmd) {
1423 case SIOCSIFMTU:
1424 VTNET_CORE_LOCK(sc);
1425 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu);
1426 VTNET_CORE_UNLOCK(sc);
1427 break;
1428
1429 case SIOCSIFFLAGS:
1430 VTNET_CORE_LOCK(sc);
1431 error = vtnet_ioctl_ifflags(sc);
1432 VTNET_CORE_UNLOCK(sc);
1433 break;
1434
1435 case SIOCADDMULTI:
1436 case SIOCDELMULTI:
1437 VTNET_CORE_LOCK(sc);
1438 error = vtnet_ioctl_multi(sc);
1439 VTNET_CORE_UNLOCK(sc);
1440 break;
1441
1442 case SIOCSIFMEDIA:
1443 case SIOCGIFMEDIA:
1444 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd);
1445 break;
1446
1447 case SIOCSIFCAP:
1448 VTNET_CORE_LOCK(sc);
1449 error = vtnet_ioctl_ifcap(sc, ifr);
1450 VTNET_CORE_UNLOCK(sc);
1451 VLAN_CAPABILITIES(ifp);
1452 break;
1453
1454 default:
1455 error = ether_ioctl(ifp, cmd, data);
1456 break;
1457 }
1458
1459 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc);
1460
1461 return (error);
1462 }
1463
1464 static int
vtnet_rxq_populate(struct vtnet_rxq * rxq)1465 vtnet_rxq_populate(struct vtnet_rxq *rxq)
1466 {
1467 struct virtqueue *vq;
1468 int nbufs, error;
1469
1470 #ifdef DEV_NETMAP
1471 error = vtnet_netmap_rxq_populate(rxq);
1472 if (error >= 0)
1473 return (error);
1474 #endif /* DEV_NETMAP */
1475
1476 vq = rxq->vtnrx_vq;
1477 error = ENOSPC;
1478
1479 for (nbufs = 0; !virtqueue_full(vq); nbufs++) {
1480 error = vtnet_rxq_new_buf(rxq);
1481 if (error)
1482 break;
1483 }
1484
1485 if (nbufs > 0) {
1486 virtqueue_notify(vq);
1487 /*
1488 * EMSGSIZE signifies the virtqueue did not have enough
1489 * entries available to hold the last mbuf. This is not
1490 * an error.
1491 */
1492 if (error == EMSGSIZE)
1493 error = 0;
1494 }
1495
1496 return (error);
1497 }
1498
1499 static void
vtnet_rxq_free_mbufs(struct vtnet_rxq * rxq)1500 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq)
1501 {
1502 struct virtqueue *vq;
1503 struct mbuf *m;
1504 int last;
1505 #ifdef DEV_NETMAP
1506 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp),
1507 rxq->vtnrx_id, NR_RX);
1508 #else /* !DEV_NETMAP */
1509 void *kring = NULL;
1510 #endif /* !DEV_NETMAP */
1511
1512 vq = rxq->vtnrx_vq;
1513 last = 0;
1514
1515 while ((m = virtqueue_drain(vq, &last)) != NULL) {
1516 if (kring == NULL)
1517 m_freem(m);
1518 }
1519
1520 KASSERT(virtqueue_empty(vq),
1521 ("%s: mbufs remaining in rx queue %p", __func__, rxq));
1522 }
1523
1524 static struct mbuf *
vtnet_rx_alloc_buf(struct vtnet_softc * sc,int nbufs,struct mbuf ** m_tailp)1525 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
1526 {
1527 struct mbuf *m_head, *m_tail, *m;
1528 int i, size;
1529
1530 m_head = NULL;
1531 size = sc->vtnet_rx_clustersz;
1532
1533 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1534 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs));
1535
1536 for (i = 0; i < nbufs; i++) {
1537 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size);
1538 if (m == NULL) {
1539 sc->vtnet_stats.mbuf_alloc_failed++;
1540 m_freem(m_head);
1541 return (NULL);
1542 }
1543
1544 m->m_len = size;
1545 if (m_head != NULL) {
1546 m_tail->m_next = m;
1547 m_tail = m;
1548 } else
1549 m_head = m_tail = m;
1550 }
1551
1552 if (m_tailp != NULL)
1553 *m_tailp = m_tail;
1554
1555 return (m_head);
1556 }
1557
1558 /*
1559 * Slow path for when LRO without mergeable buffers is negotiated.
1560 */
1561 static int
vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq * rxq,struct mbuf * m0,int len0)1562 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0,
1563 int len0)
1564 {
1565 struct vtnet_softc *sc;
1566 struct mbuf *m, *m_prev, *m_new, *m_tail;
1567 int len, clustersz, nreplace, error;
1568
1569 sc = rxq->vtnrx_sc;
1570 clustersz = sc->vtnet_rx_clustersz;
1571
1572 m_prev = NULL;
1573 m_tail = NULL;
1574 nreplace = 0;
1575
1576 m = m0;
1577 len = len0;
1578
1579 /*
1580 * Since these mbuf chains are so large, avoid allocating a complete
1581 * replacement when the received frame did not consume the entire
1582 * chain. Unused mbufs are moved to the tail of the replacement mbuf.
1583 */
1584 while (len > 0) {
1585 if (m == NULL) {
1586 sc->vtnet_stats.rx_frame_too_large++;
1587 return (EMSGSIZE);
1588 }
1589
1590 /*
1591 * Every mbuf should have the expected cluster size since that
1592 * is also used to allocate the replacements.
1593 */
1594 KASSERT(m->m_len == clustersz,
1595 ("%s: mbuf size %d not expected cluster size %d", __func__,
1596 m->m_len, clustersz));
1597
1598 m->m_len = MIN(m->m_len, len);
1599 len -= m->m_len;
1600
1601 m_prev = m;
1602 m = m->m_next;
1603 nreplace++;
1604 }
1605
1606 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs,
1607 ("%s: invalid replacement mbuf count %d max %d", __func__,
1608 nreplace, sc->vtnet_rx_nmbufs));
1609
1610 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail);
1611 if (m_new == NULL) {
1612 m_prev->m_len = clustersz;
1613 return (ENOBUFS);
1614 }
1615
1616 /*
1617 * Move any unused mbufs from the received mbuf chain onto the
1618 * end of the replacement chain.
1619 */
1620 if (m_prev->m_next != NULL) {
1621 m_tail->m_next = m_prev->m_next;
1622 m_prev->m_next = NULL;
1623 }
1624
1625 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1626 if (error) {
1627 /*
1628 * The replacement is suppose to be an copy of the one
1629 * dequeued so this is a very unexpected error.
1630 *
1631 * Restore the m0 chain to the original state if it was
1632 * modified so we can then discard it.
1633 */
1634 if (m_tail->m_next != NULL) {
1635 m_prev->m_next = m_tail->m_next;
1636 m_tail->m_next = NULL;
1637 }
1638 m_prev->m_len = clustersz;
1639 sc->vtnet_stats.rx_enq_replacement_failed++;
1640 m_freem(m_new);
1641 }
1642
1643 return (error);
1644 }
1645
1646 static int
vtnet_rxq_replace_buf(struct vtnet_rxq * rxq,struct mbuf * m,int len)1647 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len)
1648 {
1649 struct vtnet_softc *sc;
1650 struct mbuf *m_new;
1651 int error;
1652
1653 sc = rxq->vtnrx_sc;
1654
1655 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1656 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len));
1657
1658 MPASS(m->m_next == NULL);
1659 if (m->m_len < len)
1660 return (EMSGSIZE);
1661
1662 m_new = vtnet_rx_alloc_buf(sc, 1, NULL);
1663 if (m_new == NULL)
1664 return (ENOBUFS);
1665
1666 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1667 if (error) {
1668 sc->vtnet_stats.rx_enq_replacement_failed++;
1669 m_freem(m_new);
1670 } else
1671 m->m_len = len;
1672
1673 return (error);
1674 }
1675
1676 static int
vtnet_rxq_enqueue_buf(struct vtnet_rxq * rxq,struct mbuf * m)1677 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1678 {
1679 struct vtnet_softc *sc;
1680 struct sglist *sg;
1681 int header_inlined, error;
1682
1683 sc = rxq->vtnrx_sc;
1684 sg = rxq->vtnrx_sg;
1685
1686 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1687 ("%s: mbuf chain without LRO_NOMRG", __func__));
1688 VTNET_RXQ_LOCK_ASSERT(rxq);
1689
1690 sglist_reset(sg);
1691 header_inlined = vtnet_modern(sc) ||
1692 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */
1693
1694 if (header_inlined)
1695 error = sglist_append_mbuf(sg, m);
1696 else {
1697 struct vtnet_rx_header *rxhdr =
1698 mtod(m, struct vtnet_rx_header *);
1699 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr));
1700
1701 /* Append the header and remaining mbuf data. */
1702 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size);
1703 if (error)
1704 return (error);
1705 error = sglist_append(sg, &rxhdr[1],
1706 m->m_len - sizeof(struct vtnet_rx_header));
1707 if (error)
1708 return (error);
1709
1710 if (m->m_next != NULL)
1711 error = sglist_append_mbuf(sg, m->m_next);
1712 }
1713
1714 if (error)
1715 return (error);
1716
1717 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg));
1718 }
1719
1720 static int
vtnet_rxq_new_buf(struct vtnet_rxq * rxq)1721 vtnet_rxq_new_buf(struct vtnet_rxq *rxq)
1722 {
1723 struct vtnet_softc *sc;
1724 struct mbuf *m;
1725 int error;
1726
1727 sc = rxq->vtnrx_sc;
1728
1729 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL);
1730 if (m == NULL)
1731 return (ENOBUFS);
1732
1733 error = vtnet_rxq_enqueue_buf(rxq, m);
1734 if (error)
1735 m_freem(m);
1736
1737 return (error);
1738 }
1739
1740 static int
vtnet_rxq_csum_needs_csum(struct vtnet_rxq * rxq,struct mbuf * m,uint16_t etype,int hoff,struct virtio_net_hdr * hdr)1741 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype,
1742 int hoff, struct virtio_net_hdr *hdr)
1743 {
1744 struct vtnet_softc *sc;
1745 int error;
1746
1747 sc = rxq->vtnrx_sc;
1748
1749 /*
1750 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does
1751 * not have an analogous CSUM flag. The checksum has been validated,
1752 * but is incomplete (TCP/UDP pseudo header).
1753 *
1754 * The packet is likely from another VM on the same host that itself
1755 * performed checksum offloading so Tx/Rx is basically a memcpy and
1756 * the checksum has little value.
1757 *
1758 * Default to receiving the packet as-is for performance reasons, but
1759 * this can cause issues if the packet is to be forwarded because it
1760 * does not contain a valid checksum. This patch may be helpful:
1761 * https://reviews.freebsd.org/D6611. In the meantime, have the driver
1762 * compute the checksum if requested.
1763 *
1764 * BMV: Need to add an CSUM_PARTIAL flag?
1765 */
1766 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) {
1767 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr);
1768 return (error);
1769 }
1770
1771 /*
1772 * Compute the checksum in the driver so the packet will contain a
1773 * valid checksum. The checksum is at csum_offset from csum_start.
1774 */
1775 switch (etype) {
1776 #if defined(INET) || defined(INET6)
1777 case ETHERTYPE_IP:
1778 case ETHERTYPE_IPV6: {
1779 int csum_off, csum_end;
1780 uint16_t csum;
1781
1782 csum_off = hdr->csum_start + hdr->csum_offset;
1783 csum_end = csum_off + sizeof(uint16_t);
1784
1785 /* Assume checksum will be in the first mbuf. */
1786 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end)
1787 return (1);
1788
1789 /*
1790 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the
1791 * checksum and write it at the specified offset. We could
1792 * try to verify the packet: csum_start should probably
1793 * correspond to the start of the TCP/UDP header.
1794 *
1795 * BMV: Need to properly handle UDP with zero checksum. Is
1796 * the IPv4 header checksum implicitly validated?
1797 */
1798 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start);
1799 *(uint16_t *)(mtodo(m, csum_off)) = csum;
1800 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1801 m->m_pkthdr.csum_data = 0xFFFF;
1802 break;
1803 }
1804 #endif
1805 default:
1806 sc->vtnet_stats.rx_csum_bad_ethtype++;
1807 return (1);
1808 }
1809
1810 return (0);
1811 }
1812
1813 static int
vtnet_rxq_csum_data_valid(struct vtnet_rxq * rxq,struct mbuf * m,uint16_t etype,int hoff,struct virtio_net_hdr * hdr __unused)1814 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m,
1815 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused)
1816 {
1817 struct vtnet_softc *sc;
1818 int protocol;
1819
1820 sc = rxq->vtnrx_sc;
1821
1822 switch (etype) {
1823 #if defined(INET)
1824 case ETHERTYPE_IP:
1825 if (__predict_false(m->m_len < hoff + sizeof(struct ip)))
1826 protocol = IPPROTO_DONE;
1827 else {
1828 struct ip *ip = (struct ip *)(m->m_data + hoff);
1829 protocol = ip->ip_p;
1830 }
1831 break;
1832 #endif
1833 #if defined(INET6)
1834 case ETHERTYPE_IPV6:
1835 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr))
1836 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0)
1837 protocol = IPPROTO_DONE;
1838 break;
1839 #endif
1840 default:
1841 protocol = IPPROTO_DONE;
1842 break;
1843 }
1844
1845 switch (protocol) {
1846 case IPPROTO_TCP:
1847 case IPPROTO_UDP:
1848 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1849 m->m_pkthdr.csum_data = 0xFFFF;
1850 break;
1851 default:
1852 /*
1853 * FreeBSD does not support checksum offloading of this
1854 * protocol. Let the stack re-verify the checksum later
1855 * if the protocol is supported.
1856 */
1857 #if 0
1858 if_printf(sc->vtnet_ifp,
1859 "%s: checksum offload of unsupported protocol "
1860 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n",
1861 __func__, etype, protocol, hdr->csum_start,
1862 hdr->csum_offset);
1863 #endif
1864 break;
1865 }
1866
1867 return (0);
1868 }
1869
1870 static int
vtnet_rxq_csum(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)1871 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m,
1872 struct virtio_net_hdr *hdr)
1873 {
1874 const struct ether_header *eh;
1875 int hoff;
1876 uint16_t etype;
1877
1878 eh = mtod(m, const struct ether_header *);
1879 etype = ntohs(eh->ether_type);
1880 if (etype == ETHERTYPE_VLAN) {
1881 /* TODO BMV: Handle QinQ. */
1882 const struct ether_vlan_header *evh =
1883 mtod(m, const struct ether_vlan_header *);
1884 etype = ntohs(evh->evl_proto);
1885 hoff = sizeof(struct ether_vlan_header);
1886 } else
1887 hoff = sizeof(struct ether_header);
1888
1889 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
1890 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr));
1891 else /* VIRTIO_NET_HDR_F_DATA_VALID */
1892 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr));
1893 }
1894
1895 static void
vtnet_rxq_discard_merged_bufs(struct vtnet_rxq * rxq,int nbufs)1896 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs)
1897 {
1898 struct mbuf *m;
1899
1900 while (--nbufs > 0) {
1901 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL);
1902 if (m == NULL)
1903 break;
1904 vtnet_rxq_discard_buf(rxq, m);
1905 }
1906 }
1907
1908 static void
vtnet_rxq_discard_buf(struct vtnet_rxq * rxq,struct mbuf * m)1909 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1910 {
1911 int error;
1912
1913 /*
1914 * Requeue the discarded mbuf. This should always be successful
1915 * since it was just dequeued.
1916 */
1917 error = vtnet_rxq_enqueue_buf(rxq, m);
1918 KASSERT(error == 0,
1919 ("%s: cannot requeue discarded mbuf %d", __func__, error));
1920 }
1921
1922 static int
vtnet_rxq_merged_eof(struct vtnet_rxq * rxq,struct mbuf * m_head,int nbufs)1923 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs)
1924 {
1925 struct vtnet_softc *sc;
1926 struct virtqueue *vq;
1927 struct mbuf *m_tail;
1928
1929 sc = rxq->vtnrx_sc;
1930 vq = rxq->vtnrx_vq;
1931 m_tail = m_head;
1932
1933 while (--nbufs > 0) {
1934 struct mbuf *m;
1935 uint32_t len;
1936
1937 m = virtqueue_dequeue(vq, &len);
1938 if (m == NULL) {
1939 rxq->vtnrx_stats.vrxs_ierrors++;
1940 goto fail;
1941 }
1942
1943 if (vtnet_rxq_new_buf(rxq) != 0) {
1944 rxq->vtnrx_stats.vrxs_iqdrops++;
1945 vtnet_rxq_discard_buf(rxq, m);
1946 if (nbufs > 1)
1947 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
1948 goto fail;
1949 }
1950
1951 if (m->m_len < len)
1952 len = m->m_len;
1953
1954 m->m_len = len;
1955 m->m_flags &= ~M_PKTHDR;
1956
1957 m_head->m_pkthdr.len += len;
1958 m_tail->m_next = m;
1959 m_tail = m;
1960 }
1961
1962 return (0);
1963
1964 fail:
1965 sc->vtnet_stats.rx_mergeable_failed++;
1966 m_freem(m_head);
1967
1968 return (1);
1969 }
1970
1971 #if defined(INET) || defined(INET6)
1972 static int
vtnet_lro_rx(struct vtnet_rxq * rxq,struct mbuf * m)1973 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m)
1974 {
1975 struct lro_ctrl *lro;
1976
1977 lro = &rxq->vtnrx_lro;
1978
1979 if (lro->lro_mbuf_max != 0) {
1980 tcp_lro_queue_mbuf(lro, m);
1981 return (0);
1982 }
1983
1984 return (tcp_lro_rx(lro, m, 0));
1985 }
1986 #endif
1987
1988 static void
vtnet_rxq_input(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)1989 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m,
1990 struct virtio_net_hdr *hdr)
1991 {
1992 struct vtnet_softc *sc;
1993 struct ifnet *ifp;
1994
1995 sc = rxq->vtnrx_sc;
1996 ifp = sc->vtnet_ifp;
1997
1998 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) {
1999 struct ether_header *eh = mtod(m, struct ether_header *);
2000 if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
2001 vtnet_vlan_tag_remove(m);
2002 /*
2003 * With the 802.1Q header removed, update the
2004 * checksum starting location accordingly.
2005 */
2006 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
2007 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN;
2008 }
2009 }
2010
2011 m->m_pkthdr.flowid = rxq->vtnrx_id;
2012 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
2013
2014 if (hdr->flags &
2015 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) {
2016 if (vtnet_rxq_csum(rxq, m, hdr) == 0)
2017 rxq->vtnrx_stats.vrxs_csum++;
2018 else
2019 rxq->vtnrx_stats.vrxs_csum_failed++;
2020 }
2021
2022 if (hdr->gso_size != 0) {
2023 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2024 case VIRTIO_NET_HDR_GSO_TCPV4:
2025 case VIRTIO_NET_HDR_GSO_TCPV6:
2026 m->m_pkthdr.lro_nsegs =
2027 howmany(m->m_pkthdr.len, hdr->gso_size);
2028 rxq->vtnrx_stats.vrxs_host_lro++;
2029 break;
2030 }
2031 }
2032
2033 rxq->vtnrx_stats.vrxs_ipackets++;
2034 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len;
2035
2036 #if defined(INET) || defined(INET6)
2037 if (vtnet_software_lro(sc) && ifp->if_capenable & IFCAP_LRO) {
2038 if (vtnet_lro_rx(rxq, m) == 0)
2039 return;
2040 }
2041 #endif
2042
2043 (*ifp->if_input)(ifp, m);
2044 }
2045
2046 static int
vtnet_rxq_eof(struct vtnet_rxq * rxq)2047 vtnet_rxq_eof(struct vtnet_rxq *rxq)
2048 {
2049 struct virtio_net_hdr lhdr, *hdr;
2050 struct vtnet_softc *sc;
2051 struct ifnet *ifp;
2052 struct virtqueue *vq;
2053 int deq, count;
2054
2055 sc = rxq->vtnrx_sc;
2056 vq = rxq->vtnrx_vq;
2057 ifp = sc->vtnet_ifp;
2058 deq = 0;
2059 count = sc->vtnet_rx_process_limit;
2060
2061 VTNET_RXQ_LOCK_ASSERT(rxq);
2062
2063 while (count-- > 0) {
2064 struct mbuf *m;
2065 uint32_t len, nbufs, adjsz;
2066
2067 m = virtqueue_dequeue(vq, &len);
2068 if (m == NULL)
2069 break;
2070 deq++;
2071
2072 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) {
2073 rxq->vtnrx_stats.vrxs_ierrors++;
2074 vtnet_rxq_discard_buf(rxq, m);
2075 continue;
2076 }
2077
2078 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) {
2079 struct virtio_net_hdr_mrg_rxbuf *mhdr =
2080 mtod(m, struct virtio_net_hdr_mrg_rxbuf *);
2081 nbufs = vtnet_htog16(sc, mhdr->num_buffers);
2082 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2083 } else if (vtnet_modern(sc)) {
2084 nbufs = 1; /* num_buffers is always 1 */
2085 adjsz = sizeof(struct virtio_net_hdr_v1);
2086 } else {
2087 nbufs = 1;
2088 adjsz = sizeof(struct vtnet_rx_header);
2089 /*
2090 * Account for our gap between the header and start of
2091 * data to keep the segments separated.
2092 */
2093 len += VTNET_RX_HEADER_PAD;
2094 }
2095
2096 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) {
2097 rxq->vtnrx_stats.vrxs_iqdrops++;
2098 vtnet_rxq_discard_buf(rxq, m);
2099 if (nbufs > 1)
2100 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
2101 continue;
2102 }
2103
2104 m->m_pkthdr.len = len;
2105 m->m_pkthdr.rcvif = ifp;
2106 m->m_pkthdr.csum_flags = 0;
2107
2108 if (nbufs > 1) {
2109 /* Dequeue the rest of chain. */
2110 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0)
2111 continue;
2112 }
2113
2114 /*
2115 * Save an endian swapped version of the header prior to it
2116 * being stripped. The header is always at the start of the
2117 * mbuf data. num_buffers was already saved (and not needed)
2118 * so use the standard header.
2119 */
2120 hdr = mtod(m, struct virtio_net_hdr *);
2121 lhdr.flags = hdr->flags;
2122 lhdr.gso_type = hdr->gso_type;
2123 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len);
2124 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size);
2125 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start);
2126 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset);
2127 m_adj(m, adjsz);
2128
2129 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) {
2130 pfil_return_t pfil;
2131
2132 pfil = pfil_run_hooks(sc->vtnet_pfil, &m, ifp, PFIL_IN,
2133 NULL);
2134 switch (pfil) {
2135 case PFIL_REALLOCED:
2136 m = pfil_mem2mbuf(m->m_data);
2137 break;
2138 case PFIL_DROPPED:
2139 case PFIL_CONSUMED:
2140 continue;
2141 default:
2142 KASSERT(pfil == PFIL_PASS,
2143 ("Filter returned %d!", pfil));
2144 }
2145 }
2146
2147 vtnet_rxq_input(rxq, m, &lhdr);
2148 }
2149
2150 if (deq > 0) {
2151 #if defined(INET) || defined(INET6)
2152 tcp_lro_flush_all(&rxq->vtnrx_lro);
2153 #endif
2154 virtqueue_notify(vq);
2155 }
2156
2157 return (count > 0 ? 0 : EAGAIN);
2158 }
2159
2160 static void
vtnet_rx_vq_process(struct vtnet_rxq * rxq,int tries)2161 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries)
2162 {
2163 struct vtnet_softc *sc;
2164 struct ifnet *ifp;
2165 u_int more;
2166 #ifdef DEV_NETMAP
2167 int nmirq;
2168 #endif /* DEV_NETMAP */
2169
2170 sc = rxq->vtnrx_sc;
2171 ifp = sc->vtnet_ifp;
2172
2173 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) {
2174 /*
2175 * Ignore this interrupt. Either this is a spurious interrupt
2176 * or multiqueue without per-VQ MSIX so every queue needs to
2177 * be polled (a brain dead configuration we could try harder
2178 * to avoid).
2179 */
2180 vtnet_rxq_disable_intr(rxq);
2181 return;
2182 }
2183
2184 VTNET_RXQ_LOCK(rxq);
2185
2186 #ifdef DEV_NETMAP
2187 /*
2188 * We call netmap_rx_irq() under lock to prevent concurrent calls.
2189 * This is not necessary to serialize the access to the RX vq, but
2190 * rather to avoid races that may happen if this interface is
2191 * attached to a VALE switch, which would cause received packets
2192 * to stall in the RX queue (nm_kr_tryget() could find the kring
2193 * busy when called from netmap_bwrap_intr_notify()).
2194 */
2195 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more);
2196 if (nmirq != NM_IRQ_PASS) {
2197 VTNET_RXQ_UNLOCK(rxq);
2198 if (nmirq == NM_IRQ_RESCHED) {
2199 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2200 }
2201 return;
2202 }
2203 #endif /* DEV_NETMAP */
2204
2205 again:
2206 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2207 VTNET_RXQ_UNLOCK(rxq);
2208 return;
2209 }
2210
2211 more = vtnet_rxq_eof(rxq);
2212 if (more || vtnet_rxq_enable_intr(rxq) != 0) {
2213 if (!more)
2214 vtnet_rxq_disable_intr(rxq);
2215 /*
2216 * This is an occasional condition or race (when !more),
2217 * so retry a few times before scheduling the taskqueue.
2218 */
2219 if (tries-- > 0)
2220 goto again;
2221
2222 rxq->vtnrx_stats.vrxs_rescheduled++;
2223 VTNET_RXQ_UNLOCK(rxq);
2224 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2225 } else
2226 VTNET_RXQ_UNLOCK(rxq);
2227 }
2228
2229 static void
vtnet_rx_vq_intr(void * xrxq)2230 vtnet_rx_vq_intr(void *xrxq)
2231 {
2232 struct vtnet_rxq *rxq;
2233
2234 rxq = xrxq;
2235 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES);
2236 }
2237
2238 static void
vtnet_rxq_tq_intr(void * xrxq,int pending __unused)2239 vtnet_rxq_tq_intr(void *xrxq, int pending __unused)
2240 {
2241 struct vtnet_rxq *rxq;
2242
2243 rxq = xrxq;
2244 vtnet_rx_vq_process(rxq, 0);
2245 }
2246
2247 static int
vtnet_txq_intr_threshold(struct vtnet_txq * txq)2248 vtnet_txq_intr_threshold(struct vtnet_txq *txq)
2249 {
2250 struct vtnet_softc *sc;
2251 int threshold;
2252
2253 sc = txq->vtntx_sc;
2254
2255 /*
2256 * The Tx interrupt is disabled until the queue free count falls
2257 * below our threshold. Completed frames are drained from the Tx
2258 * virtqueue before transmitting new frames and in the watchdog
2259 * callout, so the frequency of Tx interrupts is greatly reduced,
2260 * at the cost of not freeing mbufs as quickly as they otherwise
2261 * would be.
2262 */
2263 threshold = virtqueue_size(txq->vtntx_vq) / 4;
2264
2265 /*
2266 * Without indirect descriptors, leave enough room for the most
2267 * segments we handle.
2268 */
2269 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 &&
2270 threshold < sc->vtnet_tx_nsegs)
2271 threshold = sc->vtnet_tx_nsegs;
2272
2273 return (threshold);
2274 }
2275
2276 static int
vtnet_txq_below_threshold(struct vtnet_txq * txq)2277 vtnet_txq_below_threshold(struct vtnet_txq *txq)
2278 {
2279 struct virtqueue *vq;
2280
2281 vq = txq->vtntx_vq;
2282
2283 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold);
2284 }
2285
2286 static int
vtnet_txq_notify(struct vtnet_txq * txq)2287 vtnet_txq_notify(struct vtnet_txq *txq)
2288 {
2289 struct virtqueue *vq;
2290
2291 vq = txq->vtntx_vq;
2292
2293 txq->vtntx_watchdog = VTNET_TX_TIMEOUT;
2294 virtqueue_notify(vq);
2295
2296 if (vtnet_txq_enable_intr(txq) == 0)
2297 return (0);
2298
2299 /*
2300 * Drain frames that were completed since last checked. If this
2301 * causes the queue to go above the threshold, the caller should
2302 * continue transmitting.
2303 */
2304 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) {
2305 virtqueue_disable_intr(vq);
2306 return (1);
2307 }
2308
2309 return (0);
2310 }
2311
2312 static void
vtnet_txq_free_mbufs(struct vtnet_txq * txq)2313 vtnet_txq_free_mbufs(struct vtnet_txq *txq)
2314 {
2315 struct virtqueue *vq;
2316 struct vtnet_tx_header *txhdr;
2317 int last;
2318 #ifdef DEV_NETMAP
2319 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp),
2320 txq->vtntx_id, NR_TX);
2321 #else /* !DEV_NETMAP */
2322 void *kring = NULL;
2323 #endif /* !DEV_NETMAP */
2324
2325 vq = txq->vtntx_vq;
2326 last = 0;
2327
2328 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) {
2329 if (kring == NULL) {
2330 m_freem(txhdr->vth_mbuf);
2331 uma_zfree(vtnet_tx_header_zone, txhdr);
2332 }
2333 }
2334
2335 KASSERT(virtqueue_empty(vq),
2336 ("%s: mbufs remaining in tx queue %p", __func__, txq));
2337 }
2338
2339 /*
2340 * BMV: This can go away once we finally have offsets in the mbuf header.
2341 */
2342 static int
vtnet_txq_offload_ctx(struct vtnet_txq * txq,struct mbuf * m,int * etype,int * proto,int * start)2343 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype,
2344 int *proto, int *start)
2345 {
2346 struct vtnet_softc *sc;
2347 struct ether_vlan_header *evh;
2348 int offset;
2349
2350 sc = txq->vtntx_sc;
2351
2352 evh = mtod(m, struct ether_vlan_header *);
2353 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
2354 /* BMV: We should handle nested VLAN tags too. */
2355 *etype = ntohs(evh->evl_proto);
2356 offset = sizeof(struct ether_vlan_header);
2357 } else {
2358 *etype = ntohs(evh->evl_encap_proto);
2359 offset = sizeof(struct ether_header);
2360 }
2361
2362 switch (*etype) {
2363 #if defined(INET)
2364 case ETHERTYPE_IP: {
2365 struct ip *ip, iphdr;
2366 if (__predict_false(m->m_len < offset + sizeof(struct ip))) {
2367 m_copydata(m, offset, sizeof(struct ip),
2368 (caddr_t) &iphdr);
2369 ip = &iphdr;
2370 } else
2371 ip = (struct ip *)(m->m_data + offset);
2372 *proto = ip->ip_p;
2373 *start = offset + (ip->ip_hl << 2);
2374 break;
2375 }
2376 #endif
2377 #if defined(INET6)
2378 case ETHERTYPE_IPV6:
2379 *proto = -1;
2380 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto);
2381 /* Assert the network stack sent us a valid packet. */
2382 KASSERT(*start > offset,
2383 ("%s: mbuf %p start %d offset %d proto %d", __func__, m,
2384 *start, offset, *proto));
2385 break;
2386 #endif
2387 default:
2388 sc->vtnet_stats.tx_csum_unknown_ethtype++;
2389 return (EINVAL);
2390 }
2391
2392 return (0);
2393 }
2394
2395 static int
vtnet_txq_offload_tso(struct vtnet_txq * txq,struct mbuf * m,int eth_type,int offset,struct virtio_net_hdr * hdr)2396 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type,
2397 int offset, struct virtio_net_hdr *hdr)
2398 {
2399 static struct timeval lastecn;
2400 static int curecn;
2401 struct vtnet_softc *sc;
2402 struct tcphdr *tcp, tcphdr;
2403
2404 sc = txq->vtntx_sc;
2405
2406 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) {
2407 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr);
2408 tcp = &tcphdr;
2409 } else
2410 tcp = (struct tcphdr *)(m->m_data + offset);
2411
2412 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2));
2413 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz);
2414 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 :
2415 VIRTIO_NET_HDR_GSO_TCPV6;
2416
2417 if (__predict_false(tcp->th_flags & TH_CWR)) {
2418 /*
2419 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In
2420 * FreeBSD, ECN support is not on a per-interface basis,
2421 * but globally via the net.inet.tcp.ecn.enable sysctl
2422 * knob. The default is off.
2423 */
2424 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) {
2425 if (ppsratecheck(&lastecn, &curecn, 1))
2426 if_printf(sc->vtnet_ifp,
2427 "TSO with ECN not negotiated with host\n");
2428 return (ENOTSUP);
2429 }
2430 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2431 }
2432
2433 txq->vtntx_stats.vtxs_tso++;
2434
2435 return (0);
2436 }
2437
2438 static struct mbuf *
vtnet_txq_offload(struct vtnet_txq * txq,struct mbuf * m,struct virtio_net_hdr * hdr)2439 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m,
2440 struct virtio_net_hdr *hdr)
2441 {
2442 struct vtnet_softc *sc;
2443 int flags, etype, csum_start, proto, error;
2444
2445 sc = txq->vtntx_sc;
2446 flags = m->m_pkthdr.csum_flags;
2447
2448 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start);
2449 if (error)
2450 goto drop;
2451
2452 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) {
2453 /* Sanity check the parsed mbuf matches the offload flags. */
2454 if (__predict_false((flags & VTNET_CSUM_OFFLOAD &&
2455 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6
2456 && etype != ETHERTYPE_IPV6))) {
2457 sc->vtnet_stats.tx_csum_proto_mismatch++;
2458 goto drop;
2459 }
2460
2461 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
2462 hdr->csum_start = vtnet_gtoh16(sc, csum_start);
2463 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data);
2464 txq->vtntx_stats.vtxs_csum++;
2465 }
2466
2467 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) {
2468 /*
2469 * Sanity check the parsed mbuf IP protocol is TCP, and
2470 * VirtIO TSO reqires the checksum offloading above.
2471 */
2472 if (__predict_false(proto != IPPROTO_TCP)) {
2473 sc->vtnet_stats.tx_tso_not_tcp++;
2474 goto drop;
2475 } else if (__predict_false((hdr->flags &
2476 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) {
2477 sc->vtnet_stats.tx_tso_without_csum++;
2478 goto drop;
2479 }
2480
2481 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr);
2482 if (error)
2483 goto drop;
2484 }
2485
2486 return (m);
2487
2488 drop:
2489 m_freem(m);
2490 return (NULL);
2491 }
2492
2493 static int
vtnet_txq_enqueue_buf(struct vtnet_txq * txq,struct mbuf ** m_head,struct vtnet_tx_header * txhdr)2494 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head,
2495 struct vtnet_tx_header *txhdr)
2496 {
2497 struct vtnet_softc *sc;
2498 struct virtqueue *vq;
2499 struct sglist *sg;
2500 struct mbuf *m;
2501 int error;
2502
2503 sc = txq->vtntx_sc;
2504 vq = txq->vtntx_vq;
2505 sg = txq->vtntx_sg;
2506 m = *m_head;
2507
2508 sglist_reset(sg);
2509 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size);
2510 if (error != 0 || sg->sg_nseg != 1) {
2511 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d",
2512 __func__, error, sg->sg_nseg));
2513 goto fail;
2514 }
2515
2516 error = sglist_append_mbuf(sg, m);
2517 if (error) {
2518 m = m_defrag(m, M_NOWAIT);
2519 if (m == NULL)
2520 goto fail;
2521
2522 *m_head = m;
2523 sc->vtnet_stats.tx_defragged++;
2524
2525 error = sglist_append_mbuf(sg, m);
2526 if (error)
2527 goto fail;
2528 }
2529
2530 txhdr->vth_mbuf = m;
2531 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0);
2532
2533 return (error);
2534
2535 fail:
2536 sc->vtnet_stats.tx_defrag_failed++;
2537 m_freem(*m_head);
2538 *m_head = NULL;
2539
2540 return (ENOBUFS);
2541 }
2542
2543 static int
vtnet_txq_encap(struct vtnet_txq * txq,struct mbuf ** m_head,int flags)2544 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags)
2545 {
2546 struct vtnet_tx_header *txhdr;
2547 struct virtio_net_hdr *hdr;
2548 struct mbuf *m;
2549 int error;
2550
2551 m = *m_head;
2552 M_ASSERTPKTHDR(m);
2553
2554 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO);
2555 if (txhdr == NULL) {
2556 m_freem(m);
2557 *m_head = NULL;
2558 return (ENOMEM);
2559 }
2560
2561 /*
2562 * Always use the non-mergeable header, regardless if mergable headers
2563 * were negotiated, because for transmit num_buffers is always zero.
2564 * The vtnet_hdr_size is used to enqueue the right header size segment.
2565 */
2566 hdr = &txhdr->vth_uhdr.hdr;
2567
2568 if (m->m_flags & M_VLANTAG) {
2569 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2570 if ((*m_head = m) == NULL) {
2571 error = ENOBUFS;
2572 goto fail;
2573 }
2574 m->m_flags &= ~M_VLANTAG;
2575 }
2576
2577 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) {
2578 m = vtnet_txq_offload(txq, m, hdr);
2579 if ((*m_head = m) == NULL) {
2580 error = ENOBUFS;
2581 goto fail;
2582 }
2583 }
2584
2585 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr);
2586 fail:
2587 if (error)
2588 uma_zfree(vtnet_tx_header_zone, txhdr);
2589
2590 return (error);
2591 }
2592
2593 #ifdef VTNET_LEGACY_TX
2594
2595 static void
vtnet_start_locked(struct vtnet_txq * txq,struct ifnet * ifp)2596 vtnet_start_locked(struct vtnet_txq *txq, struct ifnet *ifp)
2597 {
2598 struct vtnet_softc *sc;
2599 struct virtqueue *vq;
2600 struct mbuf *m0;
2601 int tries, enq;
2602
2603 sc = txq->vtntx_sc;
2604 vq = txq->vtntx_vq;
2605 tries = 0;
2606
2607 VTNET_TXQ_LOCK_ASSERT(txq);
2608
2609 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
2610 sc->vtnet_link_active == 0)
2611 return;
2612
2613 vtnet_txq_eof(txq);
2614
2615 again:
2616 enq = 0;
2617
2618 while (!IFQ_DRV_IS_EMPTY(&ifp->if_snd)) {
2619 if (virtqueue_full(vq))
2620 break;
2621
2622 IFQ_DRV_DEQUEUE(&ifp->if_snd, m0);
2623 if (m0 == NULL)
2624 break;
2625
2626 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) {
2627 if (m0 != NULL)
2628 IFQ_DRV_PREPEND(&ifp->if_snd, m0);
2629 break;
2630 }
2631
2632 enq++;
2633 ETHER_BPF_MTAP(ifp, m0);
2634 }
2635
2636 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2637 if (tries++ < VTNET_NOTIFY_RETRIES)
2638 goto again;
2639
2640 txq->vtntx_stats.vtxs_rescheduled++;
2641 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2642 }
2643 }
2644
2645 static void
vtnet_start(struct ifnet * ifp)2646 vtnet_start(struct ifnet *ifp)
2647 {
2648 struct vtnet_softc *sc;
2649 struct vtnet_txq *txq;
2650
2651 sc = ifp->if_softc;
2652 txq = &sc->vtnet_txqs[0];
2653
2654 VTNET_TXQ_LOCK(txq);
2655 vtnet_start_locked(txq, ifp);
2656 VTNET_TXQ_UNLOCK(txq);
2657 }
2658
2659 #else /* !VTNET_LEGACY_TX */
2660
2661 static int
vtnet_txq_mq_start_locked(struct vtnet_txq * txq,struct mbuf * m)2662 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m)
2663 {
2664 struct vtnet_softc *sc;
2665 struct virtqueue *vq;
2666 struct buf_ring *br;
2667 struct ifnet *ifp;
2668 int enq, tries, error;
2669
2670 sc = txq->vtntx_sc;
2671 vq = txq->vtntx_vq;
2672 br = txq->vtntx_br;
2673 ifp = sc->vtnet_ifp;
2674 tries = 0;
2675 error = 0;
2676
2677 VTNET_TXQ_LOCK_ASSERT(txq);
2678
2679 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
2680 sc->vtnet_link_active == 0) {
2681 if (m != NULL)
2682 error = drbr_enqueue(ifp, br, m);
2683 return (error);
2684 }
2685
2686 if (m != NULL) {
2687 error = drbr_enqueue(ifp, br, m);
2688 if (error)
2689 return (error);
2690 }
2691
2692 vtnet_txq_eof(txq);
2693
2694 again:
2695 enq = 0;
2696
2697 while ((m = drbr_peek(ifp, br)) != NULL) {
2698 if (virtqueue_full(vq)) {
2699 drbr_putback(ifp, br, m);
2700 break;
2701 }
2702
2703 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) {
2704 if (m != NULL)
2705 drbr_putback(ifp, br, m);
2706 else
2707 drbr_advance(ifp, br);
2708 break;
2709 }
2710 drbr_advance(ifp, br);
2711
2712 enq++;
2713 ETHER_BPF_MTAP(ifp, m);
2714 }
2715
2716 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2717 if (tries++ < VTNET_NOTIFY_RETRIES)
2718 goto again;
2719
2720 txq->vtntx_stats.vtxs_rescheduled++;
2721 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2722 }
2723
2724 return (0);
2725 }
2726
2727 static int
vtnet_txq_mq_start(struct ifnet * ifp,struct mbuf * m)2728 vtnet_txq_mq_start(struct ifnet *ifp, struct mbuf *m)
2729 {
2730 struct vtnet_softc *sc;
2731 struct vtnet_txq *txq;
2732 int i, npairs, error;
2733
2734 sc = ifp->if_softc;
2735 npairs = sc->vtnet_act_vq_pairs;
2736
2737 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
2738 i = m->m_pkthdr.flowid % npairs;
2739 else
2740 i = curcpu % npairs;
2741
2742 txq = &sc->vtnet_txqs[i];
2743
2744 if (VTNET_TXQ_TRYLOCK(txq) != 0) {
2745 error = vtnet_txq_mq_start_locked(txq, m);
2746 VTNET_TXQ_UNLOCK(txq);
2747 } else {
2748 error = drbr_enqueue(ifp, txq->vtntx_br, m);
2749 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask);
2750 }
2751
2752 return (error);
2753 }
2754
2755 static void
vtnet_txq_tq_deferred(void * xtxq,int pending __unused)2756 vtnet_txq_tq_deferred(void *xtxq, int pending __unused)
2757 {
2758 struct vtnet_softc *sc;
2759 struct vtnet_txq *txq;
2760
2761 txq = xtxq;
2762 sc = txq->vtntx_sc;
2763
2764 VTNET_TXQ_LOCK(txq);
2765 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br))
2766 vtnet_txq_mq_start_locked(txq, NULL);
2767 VTNET_TXQ_UNLOCK(txq);
2768 }
2769
2770 #endif /* VTNET_LEGACY_TX */
2771
2772 static void
vtnet_txq_start(struct vtnet_txq * txq)2773 vtnet_txq_start(struct vtnet_txq *txq)
2774 {
2775 struct vtnet_softc *sc;
2776 struct ifnet *ifp;
2777
2778 sc = txq->vtntx_sc;
2779 ifp = sc->vtnet_ifp;
2780
2781 #ifdef VTNET_LEGACY_TX
2782 if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
2783 vtnet_start_locked(txq, ifp);
2784 #else
2785 if (!drbr_empty(ifp, txq->vtntx_br))
2786 vtnet_txq_mq_start_locked(txq, NULL);
2787 #endif
2788 }
2789
2790 static void
vtnet_txq_tq_intr(void * xtxq,int pending __unused)2791 vtnet_txq_tq_intr(void *xtxq, int pending __unused)
2792 {
2793 struct vtnet_softc *sc;
2794 struct vtnet_txq *txq;
2795 struct ifnet *ifp;
2796
2797 txq = xtxq;
2798 sc = txq->vtntx_sc;
2799 ifp = sc->vtnet_ifp;
2800
2801 VTNET_TXQ_LOCK(txq);
2802
2803 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2804 VTNET_TXQ_UNLOCK(txq);
2805 return;
2806 }
2807
2808 vtnet_txq_eof(txq);
2809 vtnet_txq_start(txq);
2810
2811 VTNET_TXQ_UNLOCK(txq);
2812 }
2813
2814 static int
vtnet_txq_eof(struct vtnet_txq * txq)2815 vtnet_txq_eof(struct vtnet_txq *txq)
2816 {
2817 struct virtqueue *vq;
2818 struct vtnet_tx_header *txhdr;
2819 struct mbuf *m;
2820 int deq;
2821
2822 vq = txq->vtntx_vq;
2823 deq = 0;
2824 VTNET_TXQ_LOCK_ASSERT(txq);
2825
2826 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) {
2827 m = txhdr->vth_mbuf;
2828 deq++;
2829
2830 txq->vtntx_stats.vtxs_opackets++;
2831 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len;
2832 if (m->m_flags & M_MCAST)
2833 txq->vtntx_stats.vtxs_omcasts++;
2834
2835 m_freem(m);
2836 uma_zfree(vtnet_tx_header_zone, txhdr);
2837 }
2838
2839 if (virtqueue_empty(vq))
2840 txq->vtntx_watchdog = 0;
2841
2842 return (deq);
2843 }
2844
2845 static void
vtnet_tx_vq_intr(void * xtxq)2846 vtnet_tx_vq_intr(void *xtxq)
2847 {
2848 struct vtnet_softc *sc;
2849 struct vtnet_txq *txq;
2850 struct ifnet *ifp;
2851
2852 txq = xtxq;
2853 sc = txq->vtntx_sc;
2854 ifp = sc->vtnet_ifp;
2855
2856 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) {
2857 /*
2858 * Ignore this interrupt. Either this is a spurious interrupt
2859 * or multiqueue without per-VQ MSIX so every queue needs to
2860 * be polled (a brain dead configuration we could try harder
2861 * to avoid).
2862 */
2863 vtnet_txq_disable_intr(txq);
2864 return;
2865 }
2866
2867 #ifdef DEV_NETMAP
2868 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS)
2869 return;
2870 #endif /* DEV_NETMAP */
2871
2872 VTNET_TXQ_LOCK(txq);
2873
2874 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
2875 VTNET_TXQ_UNLOCK(txq);
2876 return;
2877 }
2878
2879 vtnet_txq_eof(txq);
2880 vtnet_txq_start(txq);
2881
2882 VTNET_TXQ_UNLOCK(txq);
2883 }
2884
2885 static void
vtnet_tx_start_all(struct vtnet_softc * sc)2886 vtnet_tx_start_all(struct vtnet_softc *sc)
2887 {
2888 struct vtnet_txq *txq;
2889 int i;
2890
2891 VTNET_CORE_LOCK_ASSERT(sc);
2892
2893 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2894 txq = &sc->vtnet_txqs[i];
2895
2896 VTNET_TXQ_LOCK(txq);
2897 vtnet_txq_start(txq);
2898 VTNET_TXQ_UNLOCK(txq);
2899 }
2900 }
2901
2902 #ifndef VTNET_LEGACY_TX
2903 static void
vtnet_qflush(struct ifnet * ifp)2904 vtnet_qflush(struct ifnet *ifp)
2905 {
2906 struct vtnet_softc *sc;
2907 struct vtnet_txq *txq;
2908 struct mbuf *m;
2909 int i;
2910
2911 sc = ifp->if_softc;
2912
2913 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2914 txq = &sc->vtnet_txqs[i];
2915
2916 VTNET_TXQ_LOCK(txq);
2917 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL)
2918 m_freem(m);
2919 VTNET_TXQ_UNLOCK(txq);
2920 }
2921
2922 if_qflush(ifp);
2923 }
2924 #endif
2925
2926 static int
vtnet_watchdog(struct vtnet_txq * txq)2927 vtnet_watchdog(struct vtnet_txq *txq)
2928 {
2929 struct ifnet *ifp;
2930
2931 ifp = txq->vtntx_sc->vtnet_ifp;
2932
2933 VTNET_TXQ_LOCK(txq);
2934 if (txq->vtntx_watchdog == 1) {
2935 /*
2936 * Only drain completed frames if the watchdog is about to
2937 * expire. If any frames were drained, there may be enough
2938 * free descriptors now available to transmit queued frames.
2939 * In that case, the timer will immediately be decremented
2940 * below, but the timeout is generous enough that should not
2941 * be a problem.
2942 */
2943 if (vtnet_txq_eof(txq) != 0)
2944 vtnet_txq_start(txq);
2945 }
2946
2947 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) {
2948 VTNET_TXQ_UNLOCK(txq);
2949 return (0);
2950 }
2951 VTNET_TXQ_UNLOCK(txq);
2952
2953 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id);
2954 return (1);
2955 }
2956
2957 static void
vtnet_accum_stats(struct vtnet_softc * sc,struct vtnet_rxq_stats * rxacc,struct vtnet_txq_stats * txacc)2958 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc,
2959 struct vtnet_txq_stats *txacc)
2960 {
2961
2962 bzero(rxacc, sizeof(struct vtnet_rxq_stats));
2963 bzero(txacc, sizeof(struct vtnet_txq_stats));
2964
2965 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) {
2966 struct vtnet_rxq_stats *rxst;
2967 struct vtnet_txq_stats *txst;
2968
2969 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
2970 rxacc->vrxs_ipackets += rxst->vrxs_ipackets;
2971 rxacc->vrxs_ibytes += rxst->vrxs_ibytes;
2972 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops;
2973 rxacc->vrxs_csum += rxst->vrxs_csum;
2974 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed;
2975 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled;
2976
2977 txst = &sc->vtnet_txqs[i].vtntx_stats;
2978 txacc->vtxs_opackets += txst->vtxs_opackets;
2979 txacc->vtxs_obytes += txst->vtxs_obytes;
2980 txacc->vtxs_csum += txst->vtxs_csum;
2981 txacc->vtxs_tso += txst->vtxs_tso;
2982 txacc->vtxs_rescheduled += txst->vtxs_rescheduled;
2983 }
2984 }
2985
2986 static uint64_t
vtnet_get_counter(if_t ifp,ift_counter cnt)2987 vtnet_get_counter(if_t ifp, ift_counter cnt)
2988 {
2989 struct vtnet_softc *sc;
2990 struct vtnet_rxq_stats rxaccum;
2991 struct vtnet_txq_stats txaccum;
2992
2993 sc = if_getsoftc(ifp);
2994 vtnet_accum_stats(sc, &rxaccum, &txaccum);
2995
2996 switch (cnt) {
2997 case IFCOUNTER_IPACKETS:
2998 return (rxaccum.vrxs_ipackets);
2999 case IFCOUNTER_IQDROPS:
3000 return (rxaccum.vrxs_iqdrops);
3001 case IFCOUNTER_IERRORS:
3002 return (rxaccum.vrxs_ierrors);
3003 case IFCOUNTER_OPACKETS:
3004 return (txaccum.vtxs_opackets);
3005 #ifndef VTNET_LEGACY_TX
3006 case IFCOUNTER_OBYTES:
3007 return (txaccum.vtxs_obytes);
3008 case IFCOUNTER_OMCASTS:
3009 return (txaccum.vtxs_omcasts);
3010 #endif
3011 default:
3012 return (if_get_counter_default(ifp, cnt));
3013 }
3014 }
3015
3016 static void
vtnet_tick(void * xsc)3017 vtnet_tick(void *xsc)
3018 {
3019 struct vtnet_softc *sc;
3020 struct ifnet *ifp;
3021 int i, timedout;
3022
3023 sc = xsc;
3024 ifp = sc->vtnet_ifp;
3025 timedout = 0;
3026
3027 VTNET_CORE_LOCK_ASSERT(sc);
3028
3029 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
3030 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]);
3031
3032 if (timedout != 0) {
3033 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
3034 vtnet_init_locked(sc, 0);
3035 } else
3036 callout_schedule(&sc->vtnet_tick_ch, hz);
3037 }
3038
3039 static void
vtnet_start_taskqueues(struct vtnet_softc * sc)3040 vtnet_start_taskqueues(struct vtnet_softc *sc)
3041 {
3042 device_t dev;
3043 struct vtnet_rxq *rxq;
3044 struct vtnet_txq *txq;
3045 int i, error;
3046
3047 dev = sc->vtnet_dev;
3048
3049 /*
3050 * Errors here are very difficult to recover from - we cannot
3051 * easily fail because, if this is during boot, we will hang
3052 * when freeing any successfully started taskqueues because
3053 * the scheduler isn't up yet.
3054 *
3055 * Most drivers just ignore the return value - it only fails
3056 * with ENOMEM so an error is not likely.
3057 */
3058 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
3059 rxq = &sc->vtnet_rxqs[i];
3060 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET,
3061 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id);
3062 if (error) {
3063 device_printf(dev, "failed to start rx taskq %d\n",
3064 rxq->vtnrx_id);
3065 }
3066
3067 txq = &sc->vtnet_txqs[i];
3068 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET,
3069 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id);
3070 if (error) {
3071 device_printf(dev, "failed to start tx taskq %d\n",
3072 txq->vtntx_id);
3073 }
3074 }
3075 }
3076
3077 static void
vtnet_free_taskqueues(struct vtnet_softc * sc)3078 vtnet_free_taskqueues(struct vtnet_softc *sc)
3079 {
3080 struct vtnet_rxq *rxq;
3081 struct vtnet_txq *txq;
3082 int i;
3083
3084 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3085 rxq = &sc->vtnet_rxqs[i];
3086 if (rxq->vtnrx_tq != NULL) {
3087 taskqueue_free(rxq->vtnrx_tq);
3088 rxq->vtnrx_tq = NULL;
3089 }
3090
3091 txq = &sc->vtnet_txqs[i];
3092 if (txq->vtntx_tq != NULL) {
3093 taskqueue_free(txq->vtntx_tq);
3094 txq->vtntx_tq = NULL;
3095 }
3096 }
3097 }
3098
3099 static void
vtnet_drain_taskqueues(struct vtnet_softc * sc)3100 vtnet_drain_taskqueues(struct vtnet_softc *sc)
3101 {
3102 struct vtnet_rxq *rxq;
3103 struct vtnet_txq *txq;
3104 int i;
3105
3106 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3107 rxq = &sc->vtnet_rxqs[i];
3108 if (rxq->vtnrx_tq != NULL)
3109 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
3110
3111 txq = &sc->vtnet_txqs[i];
3112 if (txq->vtntx_tq != NULL) {
3113 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask);
3114 #ifndef VTNET_LEGACY_TX
3115 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask);
3116 #endif
3117 }
3118 }
3119 }
3120
3121 static void
vtnet_drain_rxtx_queues(struct vtnet_softc * sc)3122 vtnet_drain_rxtx_queues(struct vtnet_softc *sc)
3123 {
3124 struct vtnet_rxq *rxq;
3125 struct vtnet_txq *txq;
3126 int i;
3127
3128 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3129 rxq = &sc->vtnet_rxqs[i];
3130 vtnet_rxq_free_mbufs(rxq);
3131
3132 txq = &sc->vtnet_txqs[i];
3133 vtnet_txq_free_mbufs(txq);
3134 }
3135 }
3136
3137 static void
vtnet_stop_rendezvous(struct vtnet_softc * sc)3138 vtnet_stop_rendezvous(struct vtnet_softc *sc)
3139 {
3140 struct vtnet_rxq *rxq;
3141 struct vtnet_txq *txq;
3142 int i;
3143
3144 VTNET_CORE_LOCK_ASSERT(sc);
3145
3146 /*
3147 * Lock and unlock the per-queue mutex so we known the stop
3148 * state is visible. Doing only the active queues should be
3149 * sufficient, but it does not cost much extra to do all the
3150 * queues.
3151 */
3152 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3153 rxq = &sc->vtnet_rxqs[i];
3154 VTNET_RXQ_LOCK(rxq);
3155 VTNET_RXQ_UNLOCK(rxq);
3156
3157 txq = &sc->vtnet_txqs[i];
3158 VTNET_TXQ_LOCK(txq);
3159 VTNET_TXQ_UNLOCK(txq);
3160 }
3161 }
3162
3163 static void
vtnet_stop(struct vtnet_softc * sc)3164 vtnet_stop(struct vtnet_softc *sc)
3165 {
3166 device_t dev;
3167 struct ifnet *ifp;
3168
3169 dev = sc->vtnet_dev;
3170 ifp = sc->vtnet_ifp;
3171
3172 VTNET_CORE_LOCK_ASSERT(sc);
3173
3174 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
3175 sc->vtnet_link_active = 0;
3176 callout_stop(&sc->vtnet_tick_ch);
3177
3178 /* Only advisory. */
3179 vtnet_disable_interrupts(sc);
3180
3181 #ifdef DEV_NETMAP
3182 /* Stop any pending txsync/rxsync and disable them. */
3183 netmap_disable_all_rings(ifp);
3184 #endif /* DEV_NETMAP */
3185
3186 /*
3187 * Stop the host adapter. This resets it to the pre-initialized
3188 * state. It will not generate any interrupts until after it is
3189 * reinitialized.
3190 */
3191 virtio_stop(dev);
3192 vtnet_stop_rendezvous(sc);
3193
3194 vtnet_drain_rxtx_queues(sc);
3195 sc->vtnet_act_vq_pairs = 1;
3196 }
3197
3198 static int
vtnet_virtio_reinit(struct vtnet_softc * sc)3199 vtnet_virtio_reinit(struct vtnet_softc *sc)
3200 {
3201 device_t dev;
3202 struct ifnet *ifp;
3203 uint64_t features;
3204 int error;
3205
3206 dev = sc->vtnet_dev;
3207 ifp = sc->vtnet_ifp;
3208 features = sc->vtnet_negotiated_features;
3209
3210 /*
3211 * Re-negotiate with the host, removing any disabled receive
3212 * features. Transmit features are disabled only on our side
3213 * via if_capenable and if_hwassist.
3214 */
3215
3216 if ((ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0)
3217 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES);
3218
3219 if ((ifp->if_capenable & IFCAP_LRO) == 0)
3220 features &= ~VTNET_LRO_FEATURES;
3221
3222 if ((ifp->if_capenable & IFCAP_VLAN_HWFILTER) == 0)
3223 features &= ~VIRTIO_NET_F_CTRL_VLAN;
3224
3225 error = virtio_reinit(dev, features);
3226 if (error) {
3227 device_printf(dev, "virtio reinit error %d\n", error);
3228 return (error);
3229 }
3230
3231 sc->vtnet_features = features;
3232 virtio_reinit_complete(dev);
3233
3234 return (0);
3235 }
3236
3237 static void
vtnet_init_rx_filters(struct vtnet_softc * sc)3238 vtnet_init_rx_filters(struct vtnet_softc *sc)
3239 {
3240 struct ifnet *ifp;
3241
3242 ifp = sc->vtnet_ifp;
3243
3244 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
3245 vtnet_rx_filter(sc);
3246 vtnet_rx_filter_mac(sc);
3247 }
3248
3249 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER)
3250 vtnet_rx_filter_vlan(sc);
3251 }
3252
3253 static int
vtnet_init_rx_queues(struct vtnet_softc * sc)3254 vtnet_init_rx_queues(struct vtnet_softc *sc)
3255 {
3256 device_t dev;
3257 struct ifnet *ifp;
3258 struct vtnet_rxq *rxq;
3259 int i, clustersz, error;
3260
3261 dev = sc->vtnet_dev;
3262 ifp = sc->vtnet_ifp;
3263
3264 clustersz = vtnet_rx_cluster_size(sc, ifp->if_mtu);
3265 sc->vtnet_rx_clustersz = clustersz;
3266
3267 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) {
3268 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) +
3269 VTNET_MAX_RX_SIZE, clustersz);
3270 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs,
3271 ("%s: too many rx mbufs %d for %d segments", __func__,
3272 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs));
3273 } else
3274 sc->vtnet_rx_nmbufs = 1;
3275
3276 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3277 rxq = &sc->vtnet_rxqs[i];
3278
3279 /* Hold the lock to satisfy asserts. */
3280 VTNET_RXQ_LOCK(rxq);
3281 error = vtnet_rxq_populate(rxq);
3282 VTNET_RXQ_UNLOCK(rxq);
3283
3284 if (error) {
3285 device_printf(dev, "cannot populate Rx queue %d\n", i);
3286 return (error);
3287 }
3288 }
3289
3290 return (0);
3291 }
3292
3293 static int
vtnet_init_tx_queues(struct vtnet_softc * sc)3294 vtnet_init_tx_queues(struct vtnet_softc *sc)
3295 {
3296 struct vtnet_txq *txq;
3297 int i;
3298
3299 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3300 txq = &sc->vtnet_txqs[i];
3301 txq->vtntx_watchdog = 0;
3302 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq);
3303 #ifdef DEV_NETMAP
3304 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0);
3305 #endif /* DEV_NETMAP */
3306 }
3307
3308 return (0);
3309 }
3310
3311 static int
vtnet_init_rxtx_queues(struct vtnet_softc * sc)3312 vtnet_init_rxtx_queues(struct vtnet_softc *sc)
3313 {
3314 int error;
3315
3316 error = vtnet_init_rx_queues(sc);
3317 if (error)
3318 return (error);
3319
3320 error = vtnet_init_tx_queues(sc);
3321 if (error)
3322 return (error);
3323
3324 return (0);
3325 }
3326
3327 static void
vtnet_set_active_vq_pairs(struct vtnet_softc * sc)3328 vtnet_set_active_vq_pairs(struct vtnet_softc *sc)
3329 {
3330 device_t dev;
3331 int npairs;
3332
3333 dev = sc->vtnet_dev;
3334
3335 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) {
3336 sc->vtnet_act_vq_pairs = 1;
3337 return;
3338 }
3339
3340 npairs = sc->vtnet_req_vq_pairs;
3341
3342 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) {
3343 device_printf(dev, "cannot set active queue pairs to %d, "
3344 "falling back to 1 queue pair\n", npairs);
3345 npairs = 1;
3346 }
3347
3348 sc->vtnet_act_vq_pairs = npairs;
3349 }
3350
3351 static void
vtnet_update_rx_offloads(struct vtnet_softc * sc)3352 vtnet_update_rx_offloads(struct vtnet_softc *sc)
3353 {
3354 struct ifnet *ifp;
3355 uint64_t features;
3356 int error;
3357
3358 ifp = sc->vtnet_ifp;
3359 features = sc->vtnet_features;
3360
3361 VTNET_CORE_LOCK_ASSERT(sc);
3362
3363 if (ifp->if_capabilities & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
3364 if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6))
3365 features |= VIRTIO_NET_F_GUEST_CSUM;
3366 else
3367 features &= ~VIRTIO_NET_F_GUEST_CSUM;
3368 }
3369
3370 if (ifp->if_capabilities & IFCAP_LRO && !vtnet_software_lro(sc)) {
3371 if (ifp->if_capenable & IFCAP_LRO)
3372 features |= VTNET_LRO_FEATURES;
3373 else
3374 features &= ~VTNET_LRO_FEATURES;
3375 }
3376
3377 error = vtnet_ctrl_guest_offloads(sc,
3378 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 |
3379 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN |
3380 VIRTIO_NET_F_GUEST_UFO));
3381 if (error) {
3382 device_printf(sc->vtnet_dev,
3383 "%s: cannot update Rx features\n", __func__);
3384 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
3385 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
3386 vtnet_init_locked(sc, 0);
3387 }
3388 } else
3389 sc->vtnet_features = features;
3390 }
3391
3392 static int
vtnet_reinit(struct vtnet_softc * sc)3393 vtnet_reinit(struct vtnet_softc *sc)
3394 {
3395 device_t dev;
3396 struct ifnet *ifp;
3397 int error;
3398
3399 dev = sc->vtnet_dev;
3400 ifp = sc->vtnet_ifp;
3401
3402 bcopy(IF_LLADDR(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN);
3403
3404 error = vtnet_virtio_reinit(sc);
3405 if (error)
3406 return (error);
3407
3408 vtnet_set_macaddr(sc);
3409 vtnet_set_active_vq_pairs(sc);
3410
3411 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
3412 vtnet_init_rx_filters(sc);
3413
3414 ifp->if_hwassist = 0;
3415 if (ifp->if_capenable & IFCAP_TXCSUM)
3416 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD;
3417 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6)
3418 ifp->if_hwassist |= VTNET_CSUM_OFFLOAD_IPV6;
3419 if (ifp->if_capenable & IFCAP_TSO4)
3420 ifp->if_hwassist |= CSUM_IP_TSO;
3421 if (ifp->if_capenable & IFCAP_TSO6)
3422 ifp->if_hwassist |= CSUM_IP6_TSO;
3423
3424 error = vtnet_init_rxtx_queues(sc);
3425 if (error)
3426 return (error);
3427
3428 return (0);
3429 }
3430
3431 static void
vtnet_init_locked(struct vtnet_softc * sc,int init_mode)3432 vtnet_init_locked(struct vtnet_softc *sc, int init_mode)
3433 {
3434 device_t dev;
3435 struct ifnet *ifp;
3436
3437 dev = sc->vtnet_dev;
3438 ifp = sc->vtnet_ifp;
3439
3440 VTNET_CORE_LOCK_ASSERT(sc);
3441
3442 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
3443 return;
3444
3445 vtnet_stop(sc);
3446
3447 #ifdef DEV_NETMAP
3448 /* Once stopped we can update the netmap flags, if necessary. */
3449 switch (init_mode) {
3450 case VTNET_INIT_NETMAP_ENTER:
3451 nm_set_native_flags(NA(ifp));
3452 break;
3453 case VTNET_INIT_NETMAP_EXIT:
3454 nm_clear_native_flags(NA(ifp));
3455 break;
3456 }
3457 #endif /* DEV_NETMAP */
3458
3459 if (vtnet_reinit(sc) != 0) {
3460 vtnet_stop(sc);
3461 return;
3462 }
3463
3464 ifp->if_drv_flags |= IFF_DRV_RUNNING;
3465 vtnet_update_link_status(sc);
3466 vtnet_enable_interrupts(sc);
3467 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
3468
3469 #ifdef DEV_NETMAP
3470 /* Re-enable txsync/rxsync. */
3471 netmap_enable_all_rings(ifp);
3472 #endif /* DEV_NETMAP */
3473 }
3474
3475 static void
vtnet_init(void * xsc)3476 vtnet_init(void *xsc)
3477 {
3478 struct vtnet_softc *sc;
3479
3480 sc = xsc;
3481
3482 VTNET_CORE_LOCK(sc);
3483 vtnet_init_locked(sc, 0);
3484 VTNET_CORE_UNLOCK(sc);
3485 }
3486
3487 static void
vtnet_free_ctrl_vq(struct vtnet_softc * sc)3488 vtnet_free_ctrl_vq(struct vtnet_softc *sc)
3489 {
3490
3491 /*
3492 * The control virtqueue is only polled and therefore it should
3493 * already be empty.
3494 */
3495 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq),
3496 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq));
3497 }
3498
3499 static void
vtnet_exec_ctrl_cmd(struct vtnet_softc * sc,void * cookie,struct sglist * sg,int readable,int writable)3500 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie,
3501 struct sglist *sg, int readable, int writable)
3502 {
3503 struct virtqueue *vq;
3504
3505 vq = sc->vtnet_ctrl_vq;
3506
3507 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ);
3508 VTNET_CORE_LOCK_ASSERT(sc);
3509
3510 if (!virtqueue_empty(vq))
3511 return;
3512
3513 /*
3514 * Poll for the response, but the command is likely completed before
3515 * returning from the notify.
3516 */
3517 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) {
3518 virtqueue_notify(vq);
3519 virtqueue_poll(vq, NULL);
3520 }
3521 }
3522
3523 static int
vtnet_ctrl_mac_cmd(struct vtnet_softc * sc,uint8_t * hwaddr)3524 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr)
3525 {
3526 struct sglist_seg segs[3];
3527 struct sglist sg;
3528 struct {
3529 struct virtio_net_ctrl_hdr hdr __aligned(2);
3530 uint8_t pad1;
3531 uint8_t addr[ETHER_ADDR_LEN] __aligned(8);
3532 uint8_t pad2;
3533 uint8_t ack;
3534 } s;
3535 int error;
3536
3537 error = 0;
3538 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC);
3539
3540 s.hdr.class = VIRTIO_NET_CTRL_MAC;
3541 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
3542 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN);
3543 s.ack = VIRTIO_NET_ERR;
3544
3545 sglist_init(&sg, nitems(segs), segs);
3546 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3547 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN);
3548 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3549 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3550
3551 if (error == 0)
3552 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3553
3554 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3555 }
3556
3557 static int
vtnet_ctrl_guest_offloads(struct vtnet_softc * sc,uint64_t offloads)3558 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads)
3559 {
3560 struct sglist_seg segs[3];
3561 struct sglist sg;
3562 struct {
3563 struct virtio_net_ctrl_hdr hdr __aligned(2);
3564 uint8_t pad1;
3565 uint64_t offloads __aligned(8);
3566 uint8_t pad2;
3567 uint8_t ack;
3568 } s;
3569 int error;
3570
3571 error = 0;
3572 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
3573
3574 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS;
3575 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET;
3576 s.offloads = vtnet_gtoh64(sc, offloads);
3577 s.ack = VIRTIO_NET_ERR;
3578
3579 sglist_init(&sg, nitems(segs), segs);
3580 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3581 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t));
3582 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3583 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3584
3585 if (error == 0)
3586 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3587
3588 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3589 }
3590
3591 static int
vtnet_ctrl_mq_cmd(struct vtnet_softc * sc,uint16_t npairs)3592 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs)
3593 {
3594 struct sglist_seg segs[3];
3595 struct sglist sg;
3596 struct {
3597 struct virtio_net_ctrl_hdr hdr __aligned(2);
3598 uint8_t pad1;
3599 struct virtio_net_ctrl_mq mq __aligned(2);
3600 uint8_t pad2;
3601 uint8_t ack;
3602 } s;
3603 int error;
3604
3605 error = 0;
3606 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ);
3607
3608 s.hdr.class = VIRTIO_NET_CTRL_MQ;
3609 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
3610 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs);
3611 s.ack = VIRTIO_NET_ERR;
3612
3613 sglist_init(&sg, nitems(segs), segs);
3614 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3615 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq));
3616 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3617 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3618
3619 if (error == 0)
3620 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3621
3622 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3623 }
3624
3625 static int
vtnet_ctrl_rx_cmd(struct vtnet_softc * sc,uint8_t cmd,bool on)3626 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on)
3627 {
3628 struct sglist_seg segs[3];
3629 struct sglist sg;
3630 struct {
3631 struct virtio_net_ctrl_hdr hdr __aligned(2);
3632 uint8_t pad1;
3633 uint8_t onoff;
3634 uint8_t pad2;
3635 uint8_t ack;
3636 } s;
3637 int error;
3638
3639 error = 0;
3640 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3641
3642 s.hdr.class = VIRTIO_NET_CTRL_RX;
3643 s.hdr.cmd = cmd;
3644 s.onoff = on;
3645 s.ack = VIRTIO_NET_ERR;
3646
3647 sglist_init(&sg, nitems(segs), segs);
3648 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3649 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t));
3650 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3651 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3652
3653 if (error == 0)
3654 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3655
3656 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3657 }
3658
3659 static int
vtnet_set_promisc(struct vtnet_softc * sc,bool on)3660 vtnet_set_promisc(struct vtnet_softc *sc, bool on)
3661 {
3662 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on));
3663 }
3664
3665 static int
vtnet_set_allmulti(struct vtnet_softc * sc,bool on)3666 vtnet_set_allmulti(struct vtnet_softc *sc, bool on)
3667 {
3668 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on));
3669 }
3670
3671 static void
vtnet_rx_filter(struct vtnet_softc * sc)3672 vtnet_rx_filter(struct vtnet_softc *sc)
3673 {
3674 device_t dev;
3675 struct ifnet *ifp;
3676
3677 dev = sc->vtnet_dev;
3678 ifp = sc->vtnet_ifp;
3679
3680 VTNET_CORE_LOCK_ASSERT(sc);
3681
3682 if (vtnet_set_promisc(sc, ifp->if_flags & IFF_PROMISC) != 0) {
3683 device_printf(dev, "cannot %s promiscuous mode\n",
3684 ifp->if_flags & IFF_PROMISC ? "enable" : "disable");
3685 }
3686
3687 if (vtnet_set_allmulti(sc, ifp->if_flags & IFF_ALLMULTI) != 0) {
3688 device_printf(dev, "cannot %s all-multicast mode\n",
3689 ifp->if_flags & IFF_ALLMULTI ? "enable" : "disable");
3690 }
3691 }
3692
3693 static u_int
vtnet_copy_ifaddr(void * arg,struct sockaddr_dl * sdl,u_int ucnt)3694 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt)
3695 {
3696 struct vtnet_softc *sc = arg;
3697
3698 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0)
3699 return (0);
3700
3701 if (ucnt < VTNET_MAX_MAC_ENTRIES)
3702 bcopy(LLADDR(sdl),
3703 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt],
3704 ETHER_ADDR_LEN);
3705
3706 return (1);
3707 }
3708
3709 static u_int
vtnet_copy_maddr(void * arg,struct sockaddr_dl * sdl,u_int mcnt)3710 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt)
3711 {
3712 struct vtnet_mac_filter *filter = arg;
3713
3714 if (mcnt < VTNET_MAX_MAC_ENTRIES)
3715 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt],
3716 ETHER_ADDR_LEN);
3717
3718 return (1);
3719 }
3720
3721 static void
vtnet_rx_filter_mac(struct vtnet_softc * sc)3722 vtnet_rx_filter_mac(struct vtnet_softc *sc)
3723 {
3724 struct virtio_net_ctrl_hdr hdr __aligned(2);
3725 struct vtnet_mac_filter *filter;
3726 struct sglist_seg segs[4];
3727 struct sglist sg;
3728 struct ifnet *ifp;
3729 bool promisc, allmulti;
3730 u_int ucnt, mcnt;
3731 int error;
3732 uint8_t ack;
3733
3734 ifp = sc->vtnet_ifp;
3735 filter = sc->vtnet_mac_filter;
3736 error = 0;
3737
3738 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3739 VTNET_CORE_LOCK_ASSERT(sc);
3740
3741 /* Unicast MAC addresses: */
3742 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc);
3743 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES);
3744
3745 if (promisc) {
3746 ucnt = 0;
3747 if_printf(ifp, "more than %d MAC addresses assigned, "
3748 "falling back to promiscuous mode\n",
3749 VTNET_MAX_MAC_ENTRIES);
3750 }
3751
3752 /* Multicast MAC addresses: */
3753 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter);
3754 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES);
3755
3756 if (allmulti) {
3757 mcnt = 0;
3758 if_printf(ifp, "more than %d multicast MAC addresses "
3759 "assigned, falling back to all-multicast mode\n",
3760 VTNET_MAX_MAC_ENTRIES);
3761 }
3762
3763 if (promisc && allmulti)
3764 goto out;
3765
3766 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt);
3767 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt);
3768
3769 hdr.class = VIRTIO_NET_CTRL_MAC;
3770 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
3771 ack = VIRTIO_NET_ERR;
3772
3773 sglist_init(&sg, nitems(segs), segs);
3774 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr));
3775 error |= sglist_append(&sg, &filter->vmf_unicast,
3776 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN);
3777 error |= sglist_append(&sg, &filter->vmf_multicast,
3778 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN);
3779 error |= sglist_append(&sg, &ack, sizeof(uint8_t));
3780 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3781
3782 if (error == 0)
3783 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1);
3784 if (ack != VIRTIO_NET_OK)
3785 if_printf(ifp, "error setting host MAC filter table\n");
3786
3787 out:
3788 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0)
3789 if_printf(ifp, "cannot enable promiscuous mode\n");
3790 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0)
3791 if_printf(ifp, "cannot enable all-multicast mode\n");
3792 }
3793
3794 static int
vtnet_exec_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3795 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3796 {
3797 struct sglist_seg segs[3];
3798 struct sglist sg;
3799 struct {
3800 struct virtio_net_ctrl_hdr hdr __aligned(2);
3801 uint8_t pad1;
3802 uint16_t tag __aligned(2);
3803 uint8_t pad2;
3804 uint8_t ack;
3805 } s;
3806 int error;
3807
3808 error = 0;
3809 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3810
3811 s.hdr.class = VIRTIO_NET_CTRL_VLAN;
3812 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
3813 s.tag = vtnet_gtoh16(sc, tag);
3814 s.ack = VIRTIO_NET_ERR;
3815
3816 sglist_init(&sg, nitems(segs), segs);
3817 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3818 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t));
3819 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3820 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3821
3822 if (error == 0)
3823 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3824
3825 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3826 }
3827
3828 static void
vtnet_rx_filter_vlan(struct vtnet_softc * sc)3829 vtnet_rx_filter_vlan(struct vtnet_softc *sc)
3830 {
3831 int i, bit;
3832 uint32_t w;
3833 uint16_t tag;
3834
3835 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3836 VTNET_CORE_LOCK_ASSERT(sc);
3837
3838 /* Enable the filter for each configured VLAN. */
3839 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) {
3840 w = sc->vtnet_vlan_filter[i];
3841
3842 while ((bit = ffs(w) - 1) != -1) {
3843 w &= ~(1 << bit);
3844 tag = sizeof(w) * CHAR_BIT * i + bit;
3845
3846 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) {
3847 device_printf(sc->vtnet_dev,
3848 "cannot enable VLAN %d filter\n", tag);
3849 }
3850 }
3851 }
3852 }
3853
3854 static void
vtnet_update_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3855 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3856 {
3857 struct ifnet *ifp;
3858 int idx, bit;
3859
3860 ifp = sc->vtnet_ifp;
3861 idx = (tag >> 5) & 0x7F;
3862 bit = tag & 0x1F;
3863
3864 if (tag == 0 || tag > 4095)
3865 return;
3866
3867 VTNET_CORE_LOCK(sc);
3868
3869 if (add)
3870 sc->vtnet_vlan_filter[idx] |= (1 << bit);
3871 else
3872 sc->vtnet_vlan_filter[idx] &= ~(1 << bit);
3873
3874 if (ifp->if_capenable & IFCAP_VLAN_HWFILTER &&
3875 ifp->if_drv_flags & IFF_DRV_RUNNING &&
3876 vtnet_exec_vlan_filter(sc, add, tag) != 0) {
3877 device_printf(sc->vtnet_dev,
3878 "cannot %s VLAN %d %s the host filter table\n",
3879 add ? "add" : "remove", tag, add ? "to" : "from");
3880 }
3881
3882 VTNET_CORE_UNLOCK(sc);
3883 }
3884
3885 static void
vtnet_register_vlan(void * arg,struct ifnet * ifp,uint16_t tag)3886 vtnet_register_vlan(void *arg, struct ifnet *ifp, uint16_t tag)
3887 {
3888
3889 if (ifp->if_softc != arg)
3890 return;
3891
3892 vtnet_update_vlan_filter(arg, 1, tag);
3893 }
3894
3895 static void
vtnet_unregister_vlan(void * arg,struct ifnet * ifp,uint16_t tag)3896 vtnet_unregister_vlan(void *arg, struct ifnet *ifp, uint16_t tag)
3897 {
3898
3899 if (ifp->if_softc != arg)
3900 return;
3901
3902 vtnet_update_vlan_filter(arg, 0, tag);
3903 }
3904
3905 static void
vtnet_update_speed_duplex(struct vtnet_softc * sc)3906 vtnet_update_speed_duplex(struct vtnet_softc *sc)
3907 {
3908 struct ifnet *ifp;
3909 uint32_t speed;
3910
3911 ifp = sc->vtnet_ifp;
3912
3913 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0)
3914 return;
3915
3916 /* BMV: Ignore duplex. */
3917 speed = virtio_read_dev_config_4(sc->vtnet_dev,
3918 offsetof(struct virtio_net_config, speed));
3919 if (speed != UINT32_MAX)
3920 ifp->if_baudrate = IF_Mbps(speed);
3921 }
3922
3923 static int
vtnet_is_link_up(struct vtnet_softc * sc)3924 vtnet_is_link_up(struct vtnet_softc *sc)
3925 {
3926 uint16_t status;
3927
3928 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0)
3929 return (1);
3930
3931 status = virtio_read_dev_config_2(sc->vtnet_dev,
3932 offsetof(struct virtio_net_config, status));
3933
3934 return ((status & VIRTIO_NET_S_LINK_UP) != 0);
3935 }
3936
3937 static void
vtnet_update_link_status(struct vtnet_softc * sc)3938 vtnet_update_link_status(struct vtnet_softc *sc)
3939 {
3940 struct ifnet *ifp;
3941 int link;
3942
3943 ifp = sc->vtnet_ifp;
3944 VTNET_CORE_LOCK_ASSERT(sc);
3945 link = vtnet_is_link_up(sc);
3946
3947 /* Notify if the link status has changed. */
3948 if (link != 0 && sc->vtnet_link_active == 0) {
3949 vtnet_update_speed_duplex(sc);
3950 sc->vtnet_link_active = 1;
3951 if_link_state_change(ifp, LINK_STATE_UP);
3952 } else if (link == 0 && sc->vtnet_link_active != 0) {
3953 sc->vtnet_link_active = 0;
3954 if_link_state_change(ifp, LINK_STATE_DOWN);
3955 }
3956 }
3957
3958 static int
vtnet_ifmedia_upd(struct ifnet * ifp __unused)3959 vtnet_ifmedia_upd(struct ifnet *ifp __unused)
3960 {
3961 return (EOPNOTSUPP);
3962 }
3963
3964 static void
vtnet_ifmedia_sts(struct ifnet * ifp,struct ifmediareq * ifmr)3965 vtnet_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
3966 {
3967 struct vtnet_softc *sc;
3968
3969 sc = ifp->if_softc;
3970
3971 ifmr->ifm_status = IFM_AVALID;
3972 ifmr->ifm_active = IFM_ETHER;
3973
3974 VTNET_CORE_LOCK(sc);
3975 if (vtnet_is_link_up(sc) != 0) {
3976 ifmr->ifm_status |= IFM_ACTIVE;
3977 ifmr->ifm_active |= IFM_10G_T | IFM_FDX;
3978 } else
3979 ifmr->ifm_active |= IFM_NONE;
3980 VTNET_CORE_UNLOCK(sc);
3981 }
3982
3983 static void
vtnet_get_macaddr(struct vtnet_softc * sc)3984 vtnet_get_macaddr(struct vtnet_softc *sc)
3985 {
3986
3987 if (sc->vtnet_flags & VTNET_FLAG_MAC) {
3988 virtio_read_device_config_array(sc->vtnet_dev,
3989 offsetof(struct virtio_net_config, mac),
3990 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN);
3991 } else {
3992 /* Generate a random locally administered unicast address. */
3993 sc->vtnet_hwaddr[0] = 0xB2;
3994 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0);
3995 }
3996 }
3997
3998 static void
vtnet_set_macaddr(struct vtnet_softc * sc)3999 vtnet_set_macaddr(struct vtnet_softc *sc)
4000 {
4001 device_t dev;
4002 int error;
4003
4004 dev = sc->vtnet_dev;
4005
4006 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) {
4007 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr);
4008 if (error)
4009 device_printf(dev, "unable to set MAC address\n");
4010 return;
4011 }
4012
4013 /* MAC in config is read-only in modern VirtIO. */
4014 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) {
4015 for (int i = 0; i < ETHER_ADDR_LEN; i++) {
4016 virtio_write_dev_config_1(dev,
4017 offsetof(struct virtio_net_config, mac) + i,
4018 sc->vtnet_hwaddr[i]);
4019 }
4020 }
4021 }
4022
4023 static void
vtnet_attached_set_macaddr(struct vtnet_softc * sc)4024 vtnet_attached_set_macaddr(struct vtnet_softc *sc)
4025 {
4026
4027 /* Assign MAC address if it was generated. */
4028 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0)
4029 vtnet_set_macaddr(sc);
4030 }
4031
4032 static void
vtnet_vlan_tag_remove(struct mbuf * m)4033 vtnet_vlan_tag_remove(struct mbuf *m)
4034 {
4035 struct ether_vlan_header *evh;
4036
4037 evh = mtod(m, struct ether_vlan_header *);
4038 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag);
4039 m->m_flags |= M_VLANTAG;
4040
4041 /* Strip the 802.1Q header. */
4042 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN,
4043 ETHER_HDR_LEN - ETHER_TYPE_LEN);
4044 m_adj(m, ETHER_VLAN_ENCAP_LEN);
4045 }
4046
4047 static void
vtnet_set_rx_process_limit(struct vtnet_softc * sc)4048 vtnet_set_rx_process_limit(struct vtnet_softc *sc)
4049 {
4050 int limit;
4051
4052 limit = vtnet_tunable_int(sc, "rx_process_limit",
4053 vtnet_rx_process_limit);
4054 if (limit < 0)
4055 limit = INT_MAX;
4056 sc->vtnet_rx_process_limit = limit;
4057 }
4058
4059 static void
vtnet_setup_rxq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_rxq * rxq)4060 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx,
4061 struct sysctl_oid_list *child, struct vtnet_rxq *rxq)
4062 {
4063 struct sysctl_oid *node;
4064 struct sysctl_oid_list *list;
4065 struct vtnet_rxq_stats *stats;
4066 char namebuf[16];
4067
4068 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id);
4069 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4070 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue");
4071 list = SYSCTL_CHILDREN(node);
4072
4073 stats = &rxq->vtnrx_stats;
4074
4075 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD,
4076 &stats->vrxs_ipackets, "Receive packets");
4077 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD,
4078 &stats->vrxs_ibytes, "Receive bytes");
4079 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD,
4080 &stats->vrxs_iqdrops, "Receive drops");
4081 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD,
4082 &stats->vrxs_ierrors, "Receive errors");
4083 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD,
4084 &stats->vrxs_csum, "Receive checksum offloaded");
4085 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD,
4086 &stats->vrxs_csum_failed, "Receive checksum offload failed");
4087 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD,
4088 &stats->vrxs_host_lro, "Receive host segmentation offloaded");
4089 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD,
4090 &stats->vrxs_rescheduled,
4091 "Receive interrupt handler rescheduled");
4092 }
4093
4094 static void
vtnet_setup_txq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_txq * txq)4095 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx,
4096 struct sysctl_oid_list *child, struct vtnet_txq *txq)
4097 {
4098 struct sysctl_oid *node;
4099 struct sysctl_oid_list *list;
4100 struct vtnet_txq_stats *stats;
4101 char namebuf[16];
4102
4103 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id);
4104 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4105 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue");
4106 list = SYSCTL_CHILDREN(node);
4107
4108 stats = &txq->vtntx_stats;
4109
4110 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD,
4111 &stats->vtxs_opackets, "Transmit packets");
4112 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD,
4113 &stats->vtxs_obytes, "Transmit bytes");
4114 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD,
4115 &stats->vtxs_omcasts, "Transmit multicasts");
4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD,
4117 &stats->vtxs_csum, "Transmit checksum offloaded");
4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD,
4119 &stats->vtxs_tso, "Transmit TCP segmentation offloaded");
4120 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD,
4121 &stats->vtxs_rescheduled,
4122 "Transmit interrupt handler rescheduled");
4123 }
4124
4125 static void
vtnet_setup_queue_sysctl(struct vtnet_softc * sc)4126 vtnet_setup_queue_sysctl(struct vtnet_softc *sc)
4127 {
4128 device_t dev;
4129 struct sysctl_ctx_list *ctx;
4130 struct sysctl_oid *tree;
4131 struct sysctl_oid_list *child;
4132 int i;
4133
4134 dev = sc->vtnet_dev;
4135 ctx = device_get_sysctl_ctx(dev);
4136 tree = device_get_sysctl_tree(dev);
4137 child = SYSCTL_CHILDREN(tree);
4138
4139 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
4140 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]);
4141 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]);
4142 }
4143 }
4144
4145 static void
vtnet_setup_stat_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_softc * sc)4146 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx,
4147 struct sysctl_oid_list *child, struct vtnet_softc *sc)
4148 {
4149 struct vtnet_statistics *stats;
4150 struct vtnet_rxq_stats rxaccum;
4151 struct vtnet_txq_stats txaccum;
4152
4153 vtnet_accum_stats(sc, &rxaccum, &txaccum);
4154
4155 stats = &sc->vtnet_stats;
4156 stats->rx_csum_offloaded = rxaccum.vrxs_csum;
4157 stats->rx_csum_failed = rxaccum.vrxs_csum_failed;
4158 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled;
4159 stats->tx_csum_offloaded = txaccum.vtxs_csum;
4160 stats->tx_tso_offloaded = txaccum.vtxs_tso;
4161 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled;
4162
4163 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed",
4164 CTLFLAG_RD, &stats->mbuf_alloc_failed,
4165 "Mbuf cluster allocation failures");
4166
4167 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large",
4168 CTLFLAG_RD, &stats->rx_frame_too_large,
4169 "Received frame larger than the mbuf chain");
4170 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed",
4171 CTLFLAG_RD, &stats->rx_enq_replacement_failed,
4172 "Enqueuing the replacement receive mbuf failed");
4173 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed",
4174 CTLFLAG_RD, &stats->rx_mergeable_failed,
4175 "Mergeable buffers receive failures");
4176 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype",
4177 CTLFLAG_RD, &stats->rx_csum_bad_ethtype,
4178 "Received checksum offloaded buffer with unsupported "
4179 "Ethernet type");
4180 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto",
4181 CTLFLAG_RD, &stats->rx_csum_bad_ipproto,
4182 "Received checksum offloaded buffer with incorrect IP protocol");
4183 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset",
4184 CTLFLAG_RD, &stats->rx_csum_bad_offset,
4185 "Received checksum offloaded buffer with incorrect offset");
4186 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto",
4187 CTLFLAG_RD, &stats->rx_csum_bad_proto,
4188 "Received checksum offloaded buffer with incorrect protocol");
4189 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed",
4190 CTLFLAG_RD, &stats->rx_csum_failed,
4191 "Received buffer checksum offload failed");
4192 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded",
4193 CTLFLAG_RD, &stats->rx_csum_offloaded,
4194 "Received buffer checksum offload succeeded");
4195 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled",
4196 CTLFLAG_RD, &stats->rx_task_rescheduled,
4197 "Times the receive interrupt task rescheduled itself");
4198
4199 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype",
4200 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype,
4201 "Aborted transmit of checksum offloaded buffer with unknown "
4202 "Ethernet type");
4203 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch",
4204 CTLFLAG_RD, &stats->tx_csum_proto_mismatch,
4205 "Aborted transmit of checksum offloaded buffer because mismatched "
4206 "protocols");
4207 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp",
4208 CTLFLAG_RD, &stats->tx_tso_not_tcp,
4209 "Aborted transmit of TSO buffer with non TCP protocol");
4210 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum",
4211 CTLFLAG_RD, &stats->tx_tso_without_csum,
4212 "Aborted transmit of TSO buffer without TCP checksum offload");
4213 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged",
4214 CTLFLAG_RD, &stats->tx_defragged,
4215 "Transmit mbufs defragged");
4216 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed",
4217 CTLFLAG_RD, &stats->tx_defrag_failed,
4218 "Aborted transmit of buffer because defrag failed");
4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded",
4220 CTLFLAG_RD, &stats->tx_csum_offloaded,
4221 "Offloaded checksum of transmitted buffer");
4222 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded",
4223 CTLFLAG_RD, &stats->tx_tso_offloaded,
4224 "Segmentation offload of transmitted buffer");
4225 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled",
4226 CTLFLAG_RD, &stats->tx_task_rescheduled,
4227 "Times the transmit interrupt task rescheduled itself");
4228 }
4229
4230 static void
vtnet_setup_sysctl(struct vtnet_softc * sc)4231 vtnet_setup_sysctl(struct vtnet_softc *sc)
4232 {
4233 device_t dev;
4234 struct sysctl_ctx_list *ctx;
4235 struct sysctl_oid *tree;
4236 struct sysctl_oid_list *child;
4237
4238 dev = sc->vtnet_dev;
4239 ctx = device_get_sysctl_ctx(dev);
4240 tree = device_get_sysctl_tree(dev);
4241 child = SYSCTL_CHILDREN(tree);
4242
4243 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs",
4244 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0,
4245 "Number of maximum supported virtqueue pairs");
4246 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs",
4247 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0,
4248 "Number of requested virtqueue pairs");
4249 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
4250 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,
4251 "Number of active virtqueue pairs");
4252
4253 vtnet_setup_stat_sysctl(ctx, child, sc);
4254 }
4255
4256 static void
vtnet_load_tunables(struct vtnet_softc * sc)4257 vtnet_load_tunables(struct vtnet_softc *sc)
4258 {
4259
4260 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc,
4261 "lro_entry_count", vtnet_lro_entry_count);
4262 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES)
4263 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES;
4264
4265 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc,
4266 "lro_mbufq_depth", vtnet_lro_mbufq_depth);
4267 }
4268
4269 static int
vtnet_rxq_enable_intr(struct vtnet_rxq * rxq)4270 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq)
4271 {
4272
4273 return (virtqueue_enable_intr(rxq->vtnrx_vq));
4274 }
4275
4276 static void
vtnet_rxq_disable_intr(struct vtnet_rxq * rxq)4277 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq)
4278 {
4279
4280 virtqueue_disable_intr(rxq->vtnrx_vq);
4281 }
4282
4283 static int
vtnet_txq_enable_intr(struct vtnet_txq * txq)4284 vtnet_txq_enable_intr(struct vtnet_txq *txq)
4285 {
4286 struct virtqueue *vq;
4287
4288 vq = txq->vtntx_vq;
4289
4290 if (vtnet_txq_below_threshold(txq) != 0)
4291 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG));
4292
4293 /*
4294 * The free count is above our threshold. Keep the Tx interrupt
4295 * disabled until the queue is fuller.
4296 */
4297 return (0);
4298 }
4299
4300 static void
vtnet_txq_disable_intr(struct vtnet_txq * txq)4301 vtnet_txq_disable_intr(struct vtnet_txq *txq)
4302 {
4303
4304 virtqueue_disable_intr(txq->vtntx_vq);
4305 }
4306
4307 static void
vtnet_enable_rx_interrupts(struct vtnet_softc * sc)4308 vtnet_enable_rx_interrupts(struct vtnet_softc *sc)
4309 {
4310 struct vtnet_rxq *rxq;
4311 int i;
4312
4313 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
4314 rxq = &sc->vtnet_rxqs[i];
4315 if (vtnet_rxq_enable_intr(rxq) != 0)
4316 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
4317 }
4318 }
4319
4320 static void
vtnet_enable_tx_interrupts(struct vtnet_softc * sc)4321 vtnet_enable_tx_interrupts(struct vtnet_softc *sc)
4322 {
4323 int i;
4324
4325 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4326 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]);
4327 }
4328
4329 static void
vtnet_enable_interrupts(struct vtnet_softc * sc)4330 vtnet_enable_interrupts(struct vtnet_softc *sc)
4331 {
4332
4333 vtnet_enable_rx_interrupts(sc);
4334 vtnet_enable_tx_interrupts(sc);
4335 }
4336
4337 static void
vtnet_disable_rx_interrupts(struct vtnet_softc * sc)4338 vtnet_disable_rx_interrupts(struct vtnet_softc *sc)
4339 {
4340 int i;
4341
4342 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4343 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]);
4344 }
4345
4346 static void
vtnet_disable_tx_interrupts(struct vtnet_softc * sc)4347 vtnet_disable_tx_interrupts(struct vtnet_softc *sc)
4348 {
4349 int i;
4350
4351 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4352 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]);
4353 }
4354
4355 static void
vtnet_disable_interrupts(struct vtnet_softc * sc)4356 vtnet_disable_interrupts(struct vtnet_softc *sc)
4357 {
4358
4359 vtnet_disable_rx_interrupts(sc);
4360 vtnet_disable_tx_interrupts(sc);
4361 }
4362
4363 static int
vtnet_tunable_int(struct vtnet_softc * sc,const char * knob,int def)4364 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def)
4365 {
4366 char path[64];
4367
4368 snprintf(path, sizeof(path),
4369 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob);
4370 TUNABLE_INT_FETCH(path, &def);
4371
4372 return (def);
4373 }
4374
4375 #ifdef DEBUGNET
4376 static void
vtnet_debugnet_init(struct ifnet * ifp,int * nrxr,int * ncl,int * clsize)4377 vtnet_debugnet_init(struct ifnet *ifp, int *nrxr, int *ncl, int *clsize)
4378 {
4379 struct vtnet_softc *sc;
4380
4381 sc = if_getsoftc(ifp);
4382
4383 VTNET_CORE_LOCK(sc);
4384 *nrxr = sc->vtnet_req_vq_pairs;
4385 *ncl = DEBUGNET_MAX_IN_FLIGHT;
4386 *clsize = sc->vtnet_rx_clustersz;
4387 VTNET_CORE_UNLOCK(sc);
4388 }
4389
4390 static void
vtnet_debugnet_event(struct ifnet * ifp __unused,enum debugnet_ev event __unused)4391 vtnet_debugnet_event(struct ifnet *ifp __unused, enum debugnet_ev event __unused)
4392 {
4393 }
4394
4395 static int
vtnet_debugnet_transmit(struct ifnet * ifp,struct mbuf * m)4396 vtnet_debugnet_transmit(struct ifnet *ifp, struct mbuf *m)
4397 {
4398 struct vtnet_softc *sc;
4399 struct vtnet_txq *txq;
4400 int error;
4401
4402 sc = if_getsoftc(ifp);
4403 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4404 IFF_DRV_RUNNING)
4405 return (EBUSY);
4406
4407 txq = &sc->vtnet_txqs[0];
4408 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE);
4409 if (error == 0)
4410 (void)vtnet_txq_notify(txq);
4411 return (error);
4412 }
4413
4414 static int
vtnet_debugnet_poll(struct ifnet * ifp,int count)4415 vtnet_debugnet_poll(struct ifnet *ifp, int count)
4416 {
4417 struct vtnet_softc *sc;
4418 int i;
4419
4420 sc = if_getsoftc(ifp);
4421 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4422 IFF_DRV_RUNNING)
4423 return (EBUSY);
4424
4425 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]);
4426 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4427 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]);
4428 return (0);
4429 }
4430 #endif /* DEBUGNET */
4431