1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2011, Bryan Venteicher <bryanv@FreeBSD.org>
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 "opt_inet.h"
32 #include "opt_inet6.h"
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/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/module.h>
42 #include <sys/msan.h>
43 #include <sys/socket.h>
44 #include <sys/sysctl.h>
45 #include <sys/random.h>
46 #include <sys/sglist.h>
47 #include <sys/lock.h>
48 #include <sys/mutex.h>
49 #include <sys/taskqueue.h>
50 #include <sys/smp.h>
51 #include <machine/smp.h>
52
53 #include <vm/uma.h>
54
55 #include <net/debugnet.h>
56 #include <net/ethernet.h>
57 #include <net/pfil.h>
58 #include <net/if.h>
59 #include <net/if_var.h>
60 #include <net/if_arp.h>
61 #include <net/if_dl.h>
62 #include <net/if_types.h>
63 #include <net/if_media.h>
64 #include <net/if_vlan_var.h>
65
66 #include <net/bpf.h>
67
68 #include <netinet/in_systm.h>
69 #include <netinet/in.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip6.h>
72 #include <netinet6/ip6_var.h>
73 #include <netinet/udp.h>
74 #include <netinet/tcp.h>
75 #include <netinet/tcp_lro.h>
76
77 #include <machine/bus.h>
78 #include <machine/resource.h>
79 #include <sys/bus.h>
80 #include <sys/rman.h>
81
82 #include <dev/virtio/virtio.h>
83 #include <dev/virtio/virtqueue.h>
84 #include <dev/virtio/network/virtio_net.h>
85 #include <dev/virtio/network/if_vtnetvar.h>
86 #include "virtio_if.h"
87
88 #if defined(INET) || defined(INET6)
89 #include <machine/in_cksum.h>
90 #endif
91
92 #ifdef __NO_STRICT_ALIGNMENT
93 #define VTNET_ETHER_ALIGN 0
94 #else /* Strict alignment */
95 #define VTNET_ETHER_ALIGN ETHER_ALIGN
96 #endif
97
98 static int vtnet_modevent(module_t, int, void *);
99
100 static int vtnet_probe(device_t);
101 static int vtnet_attach(device_t);
102 static int vtnet_detach(device_t);
103 static int vtnet_suspend(device_t);
104 static int vtnet_resume(device_t);
105 static int vtnet_shutdown(device_t);
106 static int vtnet_attach_completed(device_t);
107 static int vtnet_config_change(device_t);
108
109 static int vtnet_negotiate_features(struct vtnet_softc *);
110 static int vtnet_setup_features(struct vtnet_softc *);
111 static int vtnet_init_rxq(struct vtnet_softc *, int);
112 static int vtnet_init_txq(struct vtnet_softc *, int);
113 static int vtnet_alloc_rxtx_queues(struct vtnet_softc *);
114 static void vtnet_free_rxtx_queues(struct vtnet_softc *);
115 static int vtnet_alloc_rx_filters(struct vtnet_softc *);
116 static void vtnet_free_rx_filters(struct vtnet_softc *);
117 static int vtnet_alloc_virtqueues(struct vtnet_softc *);
118 static void vtnet_alloc_interface(struct vtnet_softc *);
119 static int vtnet_setup_interface(struct vtnet_softc *);
120 static int vtnet_ioctl_mtu(struct vtnet_softc *, u_int);
121 static int vtnet_ioctl_ifflags(struct vtnet_softc *);
122 static int vtnet_ioctl_multi(struct vtnet_softc *);
123 static int vtnet_ioctl_ifcap(struct vtnet_softc *, struct ifreq *);
124 static int vtnet_ioctl(if_t, u_long, caddr_t);
125 static uint64_t vtnet_get_counter(if_t, ift_counter);
126
127 static int vtnet_rxq_populate(struct vtnet_rxq *);
128 static void vtnet_rxq_free_mbufs(struct vtnet_rxq *);
129 static struct mbuf *
130 vtnet_rx_alloc_buf(struct vtnet_softc *, int , struct mbuf **);
131 static int vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *,
132 struct mbuf *, int);
133 static int vtnet_rxq_replace_buf(struct vtnet_rxq *, struct mbuf *, int);
134 static int vtnet_rxq_enqueue_buf(struct vtnet_rxq *, struct mbuf *);
135 static int vtnet_rxq_new_buf(struct vtnet_rxq *);
136 #if defined(INET) || defined(INET6)
137 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *,
138 bool, int, struct virtio_net_hdr *);
139 static void vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *,
140 int);
141 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *,
142 struct virtio_net_hdr *);
143 #endif
144 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int);
145 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *);
146 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int);
147 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *,
148 struct virtio_net_hdr *);
149 static int vtnet_rxq_eof(struct vtnet_rxq *);
150 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries);
151 static void vtnet_rx_vq_intr(void *);
152 static void vtnet_rxq_tq_intr(void *, int);
153
154 static int vtnet_txq_intr_threshold(struct vtnet_txq *);
155 static int vtnet_txq_below_threshold(struct vtnet_txq *);
156 static int vtnet_txq_notify(struct vtnet_txq *);
157 static void vtnet_txq_free_mbufs(struct vtnet_txq *);
158 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *,
159 int *, int *, int *);
160 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int,
161 int, struct virtio_net_hdr *);
162 static struct mbuf *
163 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *,
164 struct virtio_net_hdr *);
165 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **,
166 struct vtnet_tx_header *);
167 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int);
168
169 /* Required for ALTQ */
170 static void vtnet_start_locked(struct vtnet_txq *, if_t);
171 static void vtnet_start(if_t);
172
173 /* Required for MQ */
174 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *);
175 static int vtnet_txq_mq_start(if_t, struct mbuf *);
176 static void vtnet_txq_tq_deferred(void *, int);
177 static void vtnet_qflush(if_t);
178
179
180 static void vtnet_txq_start(struct vtnet_txq *);
181 static void vtnet_txq_tq_intr(void *, int);
182 static int vtnet_txq_eof(struct vtnet_txq *);
183 static void vtnet_tx_vq_intr(void *);
184 static void vtnet_tx_start_all(struct vtnet_softc *);
185
186 static int vtnet_watchdog(struct vtnet_txq *);
187 static void vtnet_accum_stats(struct vtnet_softc *,
188 struct vtnet_rxq_stats *, struct vtnet_txq_stats *);
189 static void vtnet_tick(void *);
190
191 static void vtnet_start_taskqueues(struct vtnet_softc *);
192 static void vtnet_free_taskqueues(struct vtnet_softc *);
193 static void vtnet_drain_taskqueues(struct vtnet_softc *);
194
195 static void vtnet_drain_rxtx_queues(struct vtnet_softc *);
196 static void vtnet_stop_rendezvous(struct vtnet_softc *);
197 static void vtnet_stop(struct vtnet_softc *);
198 static int vtnet_virtio_reinit(struct vtnet_softc *);
199 static void vtnet_init_rx_filters(struct vtnet_softc *);
200 static int vtnet_init_rx_queues(struct vtnet_softc *);
201 static int vtnet_init_tx_queues(struct vtnet_softc *);
202 static int vtnet_init_rxtx_queues(struct vtnet_softc *);
203 static void vtnet_set_active_vq_pairs(struct vtnet_softc *);
204 static void vtnet_update_rx_offloads(struct vtnet_softc *);
205 static int vtnet_reinit(struct vtnet_softc *);
206 static void vtnet_init_locked(struct vtnet_softc *, int);
207 static void vtnet_init(void *);
208
209 static void vtnet_free_ctrl_vq(struct vtnet_softc *);
210 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *,
211 struct sglist *, int, int);
212 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *);
213 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t);
214 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t);
215 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool);
216 static int vtnet_set_promisc(struct vtnet_softc *, bool);
217 static int vtnet_set_allmulti(struct vtnet_softc *, bool);
218 static void vtnet_rx_filter(struct vtnet_softc *);
219 static void vtnet_rx_filter_mac(struct vtnet_softc *);
220 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t);
221 static void vtnet_rx_filter_vlan(struct vtnet_softc *);
222 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t);
223 static void vtnet_register_vlan(void *, if_t, uint16_t);
224 static void vtnet_unregister_vlan(void *, if_t, uint16_t);
225
226 static void vtnet_update_speed_duplex(struct vtnet_softc *);
227 static int vtnet_is_link_up(struct vtnet_softc *);
228 static void vtnet_update_link_status(struct vtnet_softc *);
229 static int vtnet_ifmedia_upd(if_t);
230 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *);
231 static void vtnet_get_macaddr(struct vtnet_softc *);
232 static void vtnet_set_macaddr(struct vtnet_softc *);
233 static void vtnet_attached_set_macaddr(struct vtnet_softc *);
234 static void vtnet_vlan_tag_remove(struct mbuf *);
235 static void vtnet_set_rx_process_limit(struct vtnet_softc *);
236
237 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *,
238 struct sysctl_oid_list *, struct vtnet_rxq *);
239 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *,
240 struct sysctl_oid_list *, struct vtnet_txq *);
241 static void vtnet_setup_queue_sysctl(struct vtnet_softc *);
242 static void vtnet_load_tunables(struct vtnet_softc *);
243 static void vtnet_setup_sysctl(struct vtnet_softc *);
244
245 static int vtnet_rxq_enable_intr(struct vtnet_rxq *);
246 static void vtnet_rxq_disable_intr(struct vtnet_rxq *);
247 static int vtnet_txq_enable_intr(struct vtnet_txq *);
248 static void vtnet_txq_disable_intr(struct vtnet_txq *);
249 static void vtnet_enable_rx_interrupts(struct vtnet_softc *);
250 static void vtnet_enable_tx_interrupts(struct vtnet_softc *);
251 static void vtnet_enable_interrupts(struct vtnet_softc *);
252 static void vtnet_disable_rx_interrupts(struct vtnet_softc *);
253 static void vtnet_disable_tx_interrupts(struct vtnet_softc *);
254 static void vtnet_disable_interrupts(struct vtnet_softc *);
255
256 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int);
257
258 DEBUGNET_DEFINE(vtnet);
259
260 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val)
261 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val)
262 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val)
263 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val)
264 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val)
265 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val)
266
267 /* Tunables. */
268 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
269 "VirtIO Net driver parameters");
270
271 static int vtnet_csum_disable = 0;
272 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN,
273 &vtnet_csum_disable, 0, "Disables receive and send checksum offload");
274
275 static int vtnet_fixup_needs_csum = 0;
276 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN,
277 &vtnet_fixup_needs_csum, 0,
278 "Calculate valid checksum for NEEDS_CSUM packets");
279
280 static int vtnet_tso_disable = 0;
281 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN,
282 &vtnet_tso_disable, 0, "Disables TSO");
283
284 static int vtnet_lro_disable = 0;
285 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN,
286 &vtnet_lro_disable, 0, "Disables hardware LRO");
287
288 static int vtnet_mq_disable = 0;
289 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN,
290 &vtnet_mq_disable, 0, "Disables multiqueue support");
291
292 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS;
293 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN,
294 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs");
295
296 static int vtnet_tso_maxlen = IP_MAXPACKET;
297 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN,
298 &vtnet_tso_maxlen, 0, "TSO burst limit");
299
300 static int vtnet_rx_process_limit = 1024;
301 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN,
302 &vtnet_rx_process_limit, 0,
303 "Number of RX segments processed in one pass");
304
305 static int vtnet_lro_entry_count = 128;
306 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN,
307 &vtnet_lro_entry_count, 0, "Software LRO entry count");
308
309 /* Enable sorted LRO, and the depth of the mbuf queue. */
310 static int vtnet_lro_mbufq_depth = 0;
311 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN,
312 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue");
313
314 /* Deactivate ALTQ Support */
315 static int vtnet_altq_disable = 0;
316 SYSCTL_INT(_hw_vtnet, OID_AUTO, altq_disable, CTLFLAG_RDTUN,
317 &vtnet_altq_disable, 0, "Disables ALTQ Support");
318
319 /*
320 * For the driver to be considered as having altq enabled,
321 * it must be compiled with an ALTQ capable kernel,
322 * and the tunable hw.vtnet.altq_disable must be zero
323 */
324 #define VTNET_ALTQ_ENABLED (VTNET_ALTQ_CAPABLE && (!vtnet_altq_disable))
325
326
327 static uma_zone_t vtnet_tx_header_zone;
328
329 static struct virtio_feature_desc vtnet_feature_desc[] = {
330 { VIRTIO_NET_F_CSUM, "TxChecksum" },
331 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" },
332 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" },
333 { VIRTIO_NET_F_MAC, "MAC" },
334 { VIRTIO_NET_F_GSO, "TxGSO" },
335 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" },
336 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" },
337 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" },
338 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" },
339 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" },
340 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" },
341 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" },
342 { VIRTIO_NET_F_HOST_UFO, "TxUFO" },
343 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" },
344 { VIRTIO_NET_F_STATUS, "Status" },
345 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" },
346 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" },
347 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" },
348 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" },
349 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" },
350 { VIRTIO_NET_F_MQ, "Multiqueue" },
351 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" },
352 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" },
353
354 { 0, NULL }
355 };
356
357 static device_method_t vtnet_methods[] = {
358 /* Device methods. */
359 DEVMETHOD(device_probe, vtnet_probe),
360 DEVMETHOD(device_attach, vtnet_attach),
361 DEVMETHOD(device_detach, vtnet_detach),
362 DEVMETHOD(device_suspend, vtnet_suspend),
363 DEVMETHOD(device_resume, vtnet_resume),
364 DEVMETHOD(device_shutdown, vtnet_shutdown),
365
366 /* VirtIO methods. */
367 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed),
368 DEVMETHOD(virtio_config_change, vtnet_config_change),
369
370 DEVMETHOD_END
371 };
372
373 #ifdef DEV_NETMAP
374 #include <dev/netmap/if_vtnet_netmap.h>
375 #endif
376
377 static driver_t vtnet_driver = {
378 .name = "vtnet",
379 .methods = vtnet_methods,
380 .size = sizeof(struct vtnet_softc)
381 };
382 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL);
383 MODULE_VERSION(vtnet, 1);
384 MODULE_DEPEND(vtnet, virtio, 1, 1, 1);
385 #ifdef DEV_NETMAP
386 MODULE_DEPEND(vtnet, netmap, 1, 1, 1);
387 #endif
388
389 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter");
390
391 static int
vtnet_modevent(module_t mod __unused,int type,void * unused __unused)392 vtnet_modevent(module_t mod __unused, int type, void *unused __unused)
393 {
394 int error = 0;
395 static int loaded = 0;
396
397 switch (type) {
398 case MOD_LOAD:
399 if (loaded++ == 0) {
400 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr",
401 sizeof(struct vtnet_tx_header),
402 NULL, NULL, NULL, NULL, 0, 0);
403 #ifdef DEBUGNET
404 /*
405 * We need to allocate from this zone in the transmit path, so ensure
406 * that we have at least one item per header available.
407 * XXX add a separate zone like we do for mbufs? otherwise we may alloc
408 * buckets
409 */
410 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
411 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
412 #endif
413 }
414 break;
415 case MOD_QUIESCE:
416 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0)
417 error = EBUSY;
418 break;
419 case MOD_UNLOAD:
420 if (--loaded == 0) {
421 uma_zdestroy(vtnet_tx_header_zone);
422 vtnet_tx_header_zone = NULL;
423 }
424 break;
425 case MOD_SHUTDOWN:
426 break;
427 default:
428 error = EOPNOTSUPP;
429 break;
430 }
431
432 return (error);
433 }
434
435 static int
vtnet_probe(device_t dev)436 vtnet_probe(device_t dev)
437 {
438 return (VIRTIO_SIMPLE_PROBE(dev, vtnet));
439 }
440
441 static int
vtnet_attach(device_t dev)442 vtnet_attach(device_t dev)
443 {
444 struct vtnet_softc *sc;
445 int error;
446
447 sc = device_get_softc(dev);
448 sc->vtnet_dev = dev;
449 virtio_set_feature_desc(dev, vtnet_feature_desc);
450
451 VTNET_CORE_LOCK_INIT(sc);
452 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0);
453 vtnet_load_tunables(sc);
454
455 vtnet_alloc_interface(sc);
456 vtnet_setup_sysctl(sc);
457
458 error = vtnet_setup_features(sc);
459 if (error) {
460 device_printf(dev, "cannot setup features\n");
461 goto fail;
462 }
463
464 error = vtnet_alloc_rx_filters(sc);
465 if (error) {
466 device_printf(dev, "cannot allocate Rx filters\n");
467 goto fail;
468 }
469
470 error = vtnet_alloc_rxtx_queues(sc);
471 if (error) {
472 device_printf(dev, "cannot allocate queues\n");
473 goto fail;
474 }
475
476 error = vtnet_alloc_virtqueues(sc);
477 if (error) {
478 device_printf(dev, "cannot allocate virtqueues\n");
479 goto fail;
480 }
481
482 error = vtnet_setup_interface(sc);
483 if (error) {
484 device_printf(dev, "cannot setup interface\n");
485 goto fail;
486 }
487
488 error = virtio_setup_intr(dev, INTR_TYPE_NET);
489 if (error) {
490 device_printf(dev, "cannot setup interrupts\n");
491 ether_ifdetach(sc->vtnet_ifp);
492 goto fail;
493 }
494
495 #ifdef DEV_NETMAP
496 vtnet_netmap_attach(sc);
497 #endif
498 vtnet_start_taskqueues(sc);
499
500 fail:
501 if (error)
502 vtnet_detach(dev);
503
504 return (error);
505 }
506
507 static int
vtnet_detach(device_t dev)508 vtnet_detach(device_t dev)
509 {
510 struct vtnet_softc *sc;
511 if_t ifp;
512
513 sc = device_get_softc(dev);
514 ifp = sc->vtnet_ifp;
515
516 if (device_is_attached(dev)) {
517 VTNET_CORE_LOCK(sc);
518 vtnet_stop(sc);
519 VTNET_CORE_UNLOCK(sc);
520
521 callout_drain(&sc->vtnet_tick_ch);
522 vtnet_drain_taskqueues(sc);
523
524 ether_ifdetach(ifp);
525 }
526
527 #ifdef DEV_NETMAP
528 netmap_detach(ifp);
529 #endif
530
531 if (sc->vtnet_pfil != NULL) {
532 pfil_head_unregister(sc->vtnet_pfil);
533 sc->vtnet_pfil = NULL;
534 }
535
536 vtnet_free_taskqueues(sc);
537
538 if (sc->vtnet_vlan_attach != NULL) {
539 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach);
540 sc->vtnet_vlan_attach = NULL;
541 }
542 if (sc->vtnet_vlan_detach != NULL) {
543 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach);
544 sc->vtnet_vlan_detach = NULL;
545 }
546
547 ifmedia_removeall(&sc->vtnet_media);
548
549 if (ifp != NULL) {
550 if_free(ifp);
551 sc->vtnet_ifp = NULL;
552 }
553
554 vtnet_free_rxtx_queues(sc);
555 vtnet_free_rx_filters(sc);
556
557 if (sc->vtnet_ctrl_vq != NULL)
558 vtnet_free_ctrl_vq(sc);
559
560 VTNET_CORE_LOCK_DESTROY(sc);
561
562 return (0);
563 }
564
565 static int
vtnet_suspend(device_t dev)566 vtnet_suspend(device_t dev)
567 {
568 struct vtnet_softc *sc;
569
570 sc = device_get_softc(dev);
571
572 VTNET_CORE_LOCK(sc);
573 vtnet_stop(sc);
574 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED;
575 VTNET_CORE_UNLOCK(sc);
576
577 return (0);
578 }
579
580 static int
vtnet_resume(device_t dev)581 vtnet_resume(device_t dev)
582 {
583 struct vtnet_softc *sc;
584 if_t ifp;
585
586 sc = device_get_softc(dev);
587 ifp = sc->vtnet_ifp;
588
589 VTNET_CORE_LOCK(sc);
590 if (if_getflags(ifp) & IFF_UP)
591 vtnet_init_locked(sc, 0);
592 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED;
593 VTNET_CORE_UNLOCK(sc);
594
595 return (0);
596 }
597
598 static int
vtnet_shutdown(device_t dev)599 vtnet_shutdown(device_t dev)
600 {
601 /*
602 * Suspend already does all of what we need to
603 * do here; we just never expect to be resumed.
604 */
605 return (vtnet_suspend(dev));
606 }
607
608 static int
vtnet_attach_completed(device_t dev)609 vtnet_attach_completed(device_t dev)
610 {
611 struct vtnet_softc *sc;
612
613 sc = device_get_softc(dev);
614
615 VTNET_CORE_LOCK(sc);
616 vtnet_attached_set_macaddr(sc);
617 VTNET_CORE_UNLOCK(sc);
618
619 return (0);
620 }
621
622 static int
vtnet_config_change(device_t dev)623 vtnet_config_change(device_t dev)
624 {
625 struct vtnet_softc *sc;
626
627 sc = device_get_softc(dev);
628
629 VTNET_CORE_LOCK(sc);
630 vtnet_update_link_status(sc);
631 if (sc->vtnet_link_active != 0)
632 vtnet_tx_start_all(sc);
633 VTNET_CORE_UNLOCK(sc);
634
635 return (0);
636 }
637
638 static int
vtnet_negotiate_features(struct vtnet_softc * sc)639 vtnet_negotiate_features(struct vtnet_softc *sc)
640 {
641 device_t dev;
642 uint64_t features, negotiated_features;
643 int no_csum;
644
645 dev = sc->vtnet_dev;
646 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES :
647 VTNET_LEGACY_FEATURES;
648
649 /*
650 * TSO and LRO are only available when their corresponding checksum
651 * offload feature is also negotiated.
652 */
653 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable);
654 if (no_csum)
655 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM);
656 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable))
657 features &= ~VTNET_TSO_FEATURES;
658 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable))
659 features &= ~VTNET_LRO_FEATURES;
660
661 /* Deactivate MQ Feature flag, if driver has ALTQ enabled, or MQ is explicitly disabled */
662 if (VTNET_ALTQ_ENABLED || vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable))
663 features &= ~VIRTIO_NET_F_MQ;
664
665 negotiated_features = virtio_negotiate_features(dev, features);
666
667 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
668 uint16_t mtu;
669
670 mtu = virtio_read_dev_config_2(dev,
671 offsetof(struct virtio_net_config, mtu));
672 if (mtu < VTNET_MIN_MTU) {
673 device_printf(dev, "Invalid MTU value: %d. "
674 "MTU feature disabled.\n", mtu);
675 features &= ~VIRTIO_NET_F_MTU;
676 negotiated_features =
677 virtio_negotiate_features(dev, features);
678 }
679 }
680
681 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
682 uint16_t npairs;
683
684 npairs = virtio_read_dev_config_2(dev,
685 offsetof(struct virtio_net_config, max_virtqueue_pairs));
686 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
687 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) {
688 device_printf(dev, "Invalid max_virtqueue_pairs value: "
689 "%d. Multiqueue feature disabled.\n", npairs);
690 features &= ~VIRTIO_NET_F_MQ;
691 negotiated_features =
692 virtio_negotiate_features(dev, features);
693 }
694 }
695
696 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) &&
697 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) {
698 /*
699 * LRO without mergeable buffers requires special care. This
700 * is not ideal because every receive buffer must be large
701 * enough to hold the maximum TCP packet, the Ethernet header,
702 * and the header. This requires up to 34 descriptors with
703 * MCLBYTES clusters. If we do not have indirect descriptors,
704 * LRO is disabled since the virtqueue will not contain very
705 * many receive buffers.
706 */
707 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) {
708 device_printf(dev,
709 "Host LRO disabled since both mergeable buffers "
710 "and indirect descriptors were not negotiated\n");
711 features &= ~VTNET_LRO_FEATURES;
712 negotiated_features =
713 virtio_negotiate_features(dev, features);
714 } else
715 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG;
716 }
717
718 sc->vtnet_features = negotiated_features;
719 sc->vtnet_negotiated_features = negotiated_features;
720
721 return (virtio_finalize_features(dev));
722 }
723
724 static int
vtnet_setup_features(struct vtnet_softc * sc)725 vtnet_setup_features(struct vtnet_softc *sc)
726 {
727 device_t dev;
728 int error;
729
730 dev = sc->vtnet_dev;
731
732 error = vtnet_negotiate_features(sc);
733 if (error)
734 return (error);
735
736 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1))
737 sc->vtnet_flags |= VTNET_FLAG_MODERN;
738 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC))
739 sc->vtnet_flags |= VTNET_FLAG_INDIRECT;
740 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX))
741 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX;
742
743 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) {
744 /* This feature should always be negotiated. */
745 sc->vtnet_flags |= VTNET_FLAG_MAC;
746 }
747
748 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
749 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev,
750 offsetof(struct virtio_net_config, mtu));
751 } else
752 sc->vtnet_max_mtu = VTNET_MAX_MTU;
753
754 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) {
755 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS;
756 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
757 } else if (vtnet_modern(sc)) {
758 /* This is identical to the mergeable header. */
759 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1);
760 } else
761 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
762
763 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
764 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE;
765 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
766 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG;
767 else
768 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE;
769
770 /*
771 * Favor "hardware" LRO if negotiated, but support software LRO as
772 * a fallback; there is usually little benefit (or worse) with both.
773 */
774 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 &&
775 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0)
776 sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
777
778 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) ||
779 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) ||
780 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
781 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX;
782 else
783 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN;
784
785 sc->vtnet_req_vq_pairs = 1;
786 sc->vtnet_max_vq_pairs = 1;
787
788 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
789 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ;
790
791 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
792 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX;
793 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN))
794 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER;
795 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR))
796 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC;
797
798 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
799 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev,
800 offsetof(struct virtio_net_config,
801 max_virtqueue_pairs));
802 }
803 }
804
805 if (sc->vtnet_max_vq_pairs > 1) {
806 int req;
807
808 /*
809 * Limit the maximum number of requested queue pairs to the
810 * number of CPUs and the configured maximum.
811 */
812 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs);
813 if (req < 0)
814 req = 1;
815 if (req == 0)
816 req = mp_ncpus;
817 if (req > sc->vtnet_max_vq_pairs)
818 req = sc->vtnet_max_vq_pairs;
819 if (req > mp_ncpus)
820 req = mp_ncpus;
821 if (req > 1) {
822 sc->vtnet_req_vq_pairs = req;
823 sc->vtnet_flags |= VTNET_FLAG_MQ;
824 }
825 }
826
827 return (0);
828 }
829
830 static int
vtnet_init_rxq(struct vtnet_softc * sc,int id)831 vtnet_init_rxq(struct vtnet_softc *sc, int id)
832 {
833 struct vtnet_rxq *rxq;
834
835 rxq = &sc->vtnet_rxqs[id];
836
837 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d",
838 device_get_nameunit(sc->vtnet_dev), id);
839 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF);
840
841 rxq->vtnrx_sc = sc;
842 rxq->vtnrx_id = id;
843
844 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT);
845 if (rxq->vtnrx_sg == NULL)
846 return (ENOMEM);
847
848 #if defined(INET) || defined(INET6)
849 if (vtnet_software_lro(sc)) {
850 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp,
851 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0)
852 return (ENOMEM);
853 }
854 #endif
855
856 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq);
857 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT,
858 taskqueue_thread_enqueue, &rxq->vtnrx_tq);
859
860 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0);
861 }
862
863 static int
vtnet_init_txq(struct vtnet_softc * sc,int id)864 vtnet_init_txq(struct vtnet_softc *sc, int id)
865 {
866 struct vtnet_txq *txq;
867
868 txq = &sc->vtnet_txqs[id];
869
870 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d",
871 device_get_nameunit(sc->vtnet_dev), id);
872 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF);
873
874 txq->vtntx_sc = sc;
875 txq->vtntx_id = id;
876
877 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT);
878 if (txq->vtntx_sg == NULL)
879 return (ENOMEM);
880
881 if (!VTNET_ALTQ_ENABLED) {
882 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF,
883 M_NOWAIT, &txq->vtntx_mtx);
884 if (txq->vtntx_br == NULL)
885 return (ENOMEM);
886
887 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq);
888 }
889 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq);
890 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT,
891 taskqueue_thread_enqueue, &txq->vtntx_tq);
892 if (txq->vtntx_tq == NULL)
893 return (ENOMEM);
894
895 return (0);
896 }
897
898 static int
vtnet_alloc_rxtx_queues(struct vtnet_softc * sc)899 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc)
900 {
901 int i, npairs, error;
902
903 npairs = sc->vtnet_max_vq_pairs;
904
905 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF,
906 M_NOWAIT | M_ZERO);
907 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF,
908 M_NOWAIT | M_ZERO);
909 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL)
910 return (ENOMEM);
911
912 for (i = 0; i < npairs; i++) {
913 error = vtnet_init_rxq(sc, i);
914 if (error)
915 return (error);
916 error = vtnet_init_txq(sc, i);
917 if (error)
918 return (error);
919 }
920
921 vtnet_set_rx_process_limit(sc);
922 vtnet_setup_queue_sysctl(sc);
923
924 return (0);
925 }
926
927 static void
vtnet_destroy_rxq(struct vtnet_rxq * rxq)928 vtnet_destroy_rxq(struct vtnet_rxq *rxq)
929 {
930
931 rxq->vtnrx_sc = NULL;
932 rxq->vtnrx_id = -1;
933
934 #if defined(INET) || defined(INET6)
935 tcp_lro_free(&rxq->vtnrx_lro);
936 #endif
937
938 if (rxq->vtnrx_sg != NULL) {
939 sglist_free(rxq->vtnrx_sg);
940 rxq->vtnrx_sg = NULL;
941 }
942
943 if (mtx_initialized(&rxq->vtnrx_mtx) != 0)
944 mtx_destroy(&rxq->vtnrx_mtx);
945 }
946
947 static void
vtnet_destroy_txq(struct vtnet_txq * txq)948 vtnet_destroy_txq(struct vtnet_txq *txq)
949 {
950
951 txq->vtntx_sc = NULL;
952 txq->vtntx_id = -1;
953
954 if (txq->vtntx_sg != NULL) {
955 sglist_free(txq->vtntx_sg);
956 txq->vtntx_sg = NULL;
957 }
958
959 if (!VTNET_ALTQ_ENABLED) {
960 if (txq->vtntx_br != NULL) {
961 buf_ring_free(txq->vtntx_br, M_DEVBUF);
962 txq->vtntx_br = NULL;
963 }
964 }
965
966 if (mtx_initialized(&txq->vtntx_mtx) != 0)
967 mtx_destroy(&txq->vtntx_mtx);
968 }
969
970 static void
vtnet_free_rxtx_queues(struct vtnet_softc * sc)971 vtnet_free_rxtx_queues(struct vtnet_softc *sc)
972 {
973 int i;
974
975 if (sc->vtnet_rxqs != NULL) {
976 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
977 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]);
978 free(sc->vtnet_rxqs, M_DEVBUF);
979 sc->vtnet_rxqs = NULL;
980 }
981
982 if (sc->vtnet_txqs != NULL) {
983 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
984 vtnet_destroy_txq(&sc->vtnet_txqs[i]);
985 free(sc->vtnet_txqs, M_DEVBUF);
986 sc->vtnet_txqs = NULL;
987 }
988 }
989
990 static int
vtnet_alloc_rx_filters(struct vtnet_softc * sc)991 vtnet_alloc_rx_filters(struct vtnet_softc *sc)
992 {
993
994 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
995 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter),
996 M_DEVBUF, M_NOWAIT | M_ZERO);
997 if (sc->vtnet_mac_filter == NULL)
998 return (ENOMEM);
999 }
1000
1001 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
1002 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) *
1003 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO);
1004 if (sc->vtnet_vlan_filter == NULL)
1005 return (ENOMEM);
1006 }
1007
1008 return (0);
1009 }
1010
1011 static void
vtnet_free_rx_filters(struct vtnet_softc * sc)1012 vtnet_free_rx_filters(struct vtnet_softc *sc)
1013 {
1014
1015 if (sc->vtnet_mac_filter != NULL) {
1016 free(sc->vtnet_mac_filter, M_DEVBUF);
1017 sc->vtnet_mac_filter = NULL;
1018 }
1019
1020 if (sc->vtnet_vlan_filter != NULL) {
1021 free(sc->vtnet_vlan_filter, M_DEVBUF);
1022 sc->vtnet_vlan_filter = NULL;
1023 }
1024 }
1025
1026 static int
vtnet_alloc_virtqueues(struct vtnet_softc * sc)1027 vtnet_alloc_virtqueues(struct vtnet_softc *sc)
1028 {
1029 device_t dev;
1030 struct vq_alloc_info *info;
1031 struct vtnet_rxq *rxq;
1032 struct vtnet_txq *txq;
1033 int i, idx, nvqs, error;
1034
1035 dev = sc->vtnet_dev;
1036
1037 nvqs = sc->vtnet_max_vq_pairs * 2;
1038 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
1039 nvqs++;
1040
1041 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT);
1042 if (info == NULL)
1043 return (ENOMEM);
1044
1045 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) {
1046 rxq = &sc->vtnet_rxqs[i];
1047 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs,
1048 vtnet_rx_vq_intr, 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], sc->vtnet_tx_nsegs,
1053 vtnet_tx_vq_intr, txq, &txq->vtntx_vq,
1054 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id);
1055 }
1056
1057 /* These queues will not be used so allocate the minimum resources. */
1058 for (; i < sc->vtnet_max_vq_pairs; i++, idx += 2) {
1059 rxq = &sc->vtnet_rxqs[i];
1060 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq,
1061 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id);
1062
1063 txq = &sc->vtnet_txqs[i];
1064 VQ_ALLOC_INFO_INIT(&info[idx + 1], 0, NULL, txq, &txq->vtntx_vq,
1065 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id);
1066 }
1067
1068 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
1069 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL,
1070 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev));
1071 }
1072
1073 error = virtio_alloc_virtqueues(dev, nvqs, info);
1074 free(info, M_TEMP);
1075
1076 return (error);
1077 }
1078
1079 static void
vtnet_alloc_interface(struct vtnet_softc * sc)1080 vtnet_alloc_interface(struct vtnet_softc *sc)
1081 {
1082 device_t dev;
1083 if_t ifp;
1084
1085 dev = sc->vtnet_dev;
1086
1087 ifp = if_alloc(IFT_ETHER);
1088 sc->vtnet_ifp = ifp;
1089 if_setsoftc(ifp, sc);
1090 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
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 if_t ifp;
1099
1100 dev = sc->vtnet_dev;
1101 ifp = sc->vtnet_ifp;
1102
1103 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
1104 if_setbaudrate(ifp, IF_Gbps(10));
1105 if_setinitfn(ifp, vtnet_init);
1106 if_setioctlfn(ifp, vtnet_ioctl);
1107 if_setgetcounterfn(ifp, vtnet_get_counter);
1108
1109 if (!VTNET_ALTQ_ENABLED) {
1110 if_settransmitfn(ifp, vtnet_txq_mq_start);
1111 if_setqflushfn(ifp, vtnet_qflush);
1112 } else {
1113 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq;
1114 if_setstartfn(ifp, vtnet_start);
1115 if_setsendqlen(ifp, virtqueue_size(vq) - 1);
1116 if_setsendqready(ifp);
1117 }
1118
1119 vtnet_get_macaddr(sc);
1120
1121 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS))
1122 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0);
1123
1124 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts);
1125 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL);
1126 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO);
1127
1128 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) {
1129 int gso;
1130
1131 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0);
1132
1133 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO);
1134 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4))
1135 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0);
1136 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
1137 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0);
1138 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN))
1139 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN;
1140
1141 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) {
1142 int tso_maxlen;
1143
1144 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0);
1145
1146 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen",
1147 vtnet_tso_maxlen);
1148 if_sethwtsomax(ifp, tso_maxlen -
1149 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
1150 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1);
1151 if_sethwtsomaxsegsize(ifp, PAGE_SIZE);
1152 }
1153 }
1154
1155 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) {
1156 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0);
1157 #ifdef notyet
1158 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */
1159 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0);
1160 #endif
1161
1162 if (vtnet_tunable_int(sc, "fixup_needs_csum",
1163 vtnet_fixup_needs_csum) != 0)
1164 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM;
1165
1166 /* Support either "hardware" or software LRO. */
1167 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0);
1168 }
1169
1170 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) {
1171 /*
1172 * VirtIO does not support VLAN tagging, but we can fake
1173 * it by inserting and removing the 802.1Q header during
1174 * transmit and receive. We are then able to do checksum
1175 * offloading of VLAN frames.
1176 */
1177 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0);
1178 }
1179
1180 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO)
1181 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0);
1182 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0);
1183 if_setcapabilitiesbit(ifp, IFCAP_HWSTATS, 0);
1184
1185 /*
1186 * Capabilities after here are not enabled by default.
1187 */
1188 if_setcapenable(ifp, if_getcapabilities(ifp));
1189
1190 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
1191 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0);
1192
1193 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
1194 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
1195 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
1196 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
1197 }
1198
1199 ether_ifattach(ifp, sc->vtnet_hwaddr);
1200
1201 /* Tell the upper layer(s) we support long frames. */
1202 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header));
1203
1204 DEBUGNET_SET(ifp, vtnet);
1205
1206 pa.pa_version = PFIL_VERSION;
1207 pa.pa_flags = PFIL_IN;
1208 pa.pa_type = PFIL_TYPE_ETHERNET;
1209 pa.pa_headname = if_name(ifp);
1210 sc->vtnet_pfil = pfil_head_register(&pa);
1211
1212 return (0);
1213 }
1214
1215 static int
vtnet_rx_cluster_size(struct vtnet_softc * sc,int mtu)1216 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu)
1217 {
1218 int framesz;
1219
1220 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
1221 return (MJUMPAGESIZE);
1222 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1223 return (MCLBYTES);
1224
1225 /*
1226 * Try to scale the receive mbuf cluster size from the MTU. We
1227 * could also use the VQ size to influence the selected size,
1228 * but that would only matter for very small queues.
1229 */
1230 if (vtnet_modern(sc)) {
1231 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1));
1232 framesz = sizeof(struct virtio_net_hdr_v1);
1233 } else
1234 framesz = sizeof(struct vtnet_rx_header);
1235 framesz += sizeof(struct ether_vlan_header) + mtu;
1236 /*
1237 * Account for the offsetting we'll do elsewhere so we allocate the
1238 * right size for the mtu.
1239 */
1240 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) {
1241 framesz += VTNET_ETHER_ALIGN;
1242 }
1243
1244 if (framesz <= MCLBYTES)
1245 return (MCLBYTES);
1246 else if (framesz <= MJUMPAGESIZE)
1247 return (MJUMPAGESIZE);
1248 else if (framesz <= MJUM9BYTES)
1249 return (MJUM9BYTES);
1250
1251 /* Sane default; avoid 16KB clusters. */
1252 return (MCLBYTES);
1253 }
1254
1255 static int
vtnet_ioctl_mtu(struct vtnet_softc * sc,u_int mtu)1256 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu)
1257 {
1258 if_t ifp;
1259 int clustersz;
1260
1261 ifp = sc->vtnet_ifp;
1262 VTNET_CORE_LOCK_ASSERT(sc);
1263
1264 if (if_getmtu(ifp) == mtu)
1265 return (0);
1266 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu)
1267 return (EINVAL);
1268
1269 if_setmtu(ifp, mtu);
1270 clustersz = vtnet_rx_cluster_size(sc, mtu);
1271
1272 if (clustersz != sc->vtnet_rx_clustersz &&
1273 if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
1274 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
1275 vtnet_init_locked(sc, 0);
1276 }
1277
1278 return (0);
1279 }
1280
1281 static int
vtnet_ioctl_ifflags(struct vtnet_softc * sc)1282 vtnet_ioctl_ifflags(struct vtnet_softc *sc)
1283 {
1284 if_t ifp;
1285 int drv_running;
1286
1287 ifp = sc->vtnet_ifp;
1288 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0;
1289
1290 VTNET_CORE_LOCK_ASSERT(sc);
1291
1292 if ((if_getflags(ifp) & IFF_UP) == 0) {
1293 if (drv_running)
1294 vtnet_stop(sc);
1295 goto out;
1296 }
1297
1298 if (!drv_running) {
1299 vtnet_init_locked(sc, 0);
1300 goto out;
1301 }
1302
1303 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) &
1304 (IFF_PROMISC | IFF_ALLMULTI)) {
1305 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
1306 vtnet_rx_filter(sc);
1307 else {
1308 /*
1309 * We don't support filtering out multicast, so
1310 * ALLMULTI is always set.
1311 */
1312 if_setflagbits(ifp, IFF_ALLMULTI, 0);
1313 if_setflagbits(ifp, IFF_PROMISC, 0);
1314 }
1315 }
1316
1317 out:
1318 sc->vtnet_if_flags = if_getflags(ifp);
1319 return (0);
1320 }
1321
1322 static int
vtnet_ioctl_multi(struct vtnet_softc * sc)1323 vtnet_ioctl_multi(struct vtnet_softc *sc)
1324 {
1325 if_t ifp;
1326
1327 ifp = sc->vtnet_ifp;
1328
1329 VTNET_CORE_LOCK_ASSERT(sc);
1330
1331 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX &&
1332 if_getdrvflags(ifp) & IFF_DRV_RUNNING)
1333 vtnet_rx_filter_mac(sc);
1334
1335 return (0);
1336 }
1337
1338 static int
vtnet_ioctl_ifcap(struct vtnet_softc * sc,struct ifreq * ifr)1339 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr)
1340 {
1341 if_t ifp;
1342 int mask, reinit, update;
1343
1344 ifp = sc->vtnet_ifp;
1345 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp);
1346 reinit = update = 0;
1347
1348 VTNET_CORE_LOCK_ASSERT(sc);
1349
1350 if (mask & IFCAP_TXCSUM)
1351 if_togglecapenable(ifp, IFCAP_TXCSUM);
1352 if (mask & IFCAP_TXCSUM_IPV6)
1353 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6);
1354 if (mask & IFCAP_TSO4)
1355 if_togglecapenable(ifp, IFCAP_TSO4);
1356 if (mask & IFCAP_TSO6)
1357 if_togglecapenable(ifp, IFCAP_TSO6);
1358
1359 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) {
1360 /*
1361 * These Rx features require the negotiated features to
1362 * be updated. Avoid a full reinit if possible.
1363 */
1364 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
1365 update = 1;
1366 else
1367 reinit = 1;
1368
1369 /* BMV: Avoid needless renegotiation for just software LRO. */
1370 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) ==
1371 IFCAP_LRO && vtnet_software_lro(sc))
1372 reinit = update = 0;
1373
1374 if (mask & IFCAP_RXCSUM)
1375 if_togglecapenable(ifp, IFCAP_RXCSUM);
1376 if (mask & IFCAP_RXCSUM_IPV6)
1377 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6);
1378 if (mask & IFCAP_LRO)
1379 if_togglecapenable(ifp, IFCAP_LRO);
1380
1381 /*
1382 * VirtIO does not distinguish between IPv4 and IPv6 checksums
1383 * so treat them as a pair. Guest TSO (LRO) requires receive
1384 * checksums.
1385 */
1386 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
1387 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0);
1388 #ifdef notyet
1389 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0);
1390 #endif
1391 } else
1392 if_setcapenablebit(ifp, 0,
1393 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO));
1394 }
1395
1396 if (mask & IFCAP_VLAN_HWFILTER) {
1397 /* These Rx features require renegotiation. */
1398 reinit = 1;
1399
1400 if (mask & IFCAP_VLAN_HWFILTER)
1401 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER);
1402 }
1403
1404 if (mask & IFCAP_VLAN_HWTSO)
1405 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO);
1406 if (mask & IFCAP_VLAN_HWTAGGING)
1407 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING);
1408
1409 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
1410 if (reinit) {
1411 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
1412 vtnet_init_locked(sc, 0);
1413 } else if (update)
1414 vtnet_update_rx_offloads(sc);
1415 }
1416
1417 return (0);
1418 }
1419
1420 static int
vtnet_ioctl(if_t ifp,u_long cmd,caddr_t data)1421 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data)
1422 {
1423 struct vtnet_softc *sc;
1424 struct ifreq *ifr;
1425 int error;
1426
1427 sc = if_getsoftc(ifp);
1428 ifr = (struct ifreq *) data;
1429 error = 0;
1430
1431 switch (cmd) {
1432 case SIOCSIFMTU:
1433 VTNET_CORE_LOCK(sc);
1434 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu);
1435 VTNET_CORE_UNLOCK(sc);
1436 break;
1437
1438 case SIOCSIFFLAGS:
1439 VTNET_CORE_LOCK(sc);
1440 error = vtnet_ioctl_ifflags(sc);
1441 VTNET_CORE_UNLOCK(sc);
1442 break;
1443
1444 case SIOCADDMULTI:
1445 case SIOCDELMULTI:
1446 VTNET_CORE_LOCK(sc);
1447 error = vtnet_ioctl_multi(sc);
1448 VTNET_CORE_UNLOCK(sc);
1449 break;
1450
1451 case SIOCSIFMEDIA:
1452 case SIOCGIFMEDIA:
1453 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd);
1454 break;
1455
1456 case SIOCSIFCAP:
1457 VTNET_CORE_LOCK(sc);
1458 error = vtnet_ioctl_ifcap(sc, ifr);
1459 VTNET_CORE_UNLOCK(sc);
1460 VLAN_CAPABILITIES(ifp);
1461 break;
1462
1463 default:
1464 error = ether_ioctl(ifp, cmd, data);
1465 break;
1466 }
1467
1468 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc);
1469
1470 return (error);
1471 }
1472
1473 static int
vtnet_rxq_populate(struct vtnet_rxq * rxq)1474 vtnet_rxq_populate(struct vtnet_rxq *rxq)
1475 {
1476 struct virtqueue *vq;
1477 int nbufs, error;
1478
1479 #ifdef DEV_NETMAP
1480 error = vtnet_netmap_rxq_populate(rxq);
1481 if (error >= 0)
1482 return (error);
1483 #endif /* DEV_NETMAP */
1484
1485 vq = rxq->vtnrx_vq;
1486 error = ENOSPC;
1487
1488 for (nbufs = 0; !virtqueue_full(vq); nbufs++) {
1489 error = vtnet_rxq_new_buf(rxq);
1490 if (error)
1491 break;
1492 }
1493
1494 if (nbufs > 0) {
1495 virtqueue_notify(vq);
1496 /*
1497 * EMSGSIZE signifies the virtqueue did not have enough
1498 * entries available to hold the last mbuf. This is not
1499 * an error.
1500 */
1501 if (error == EMSGSIZE)
1502 error = 0;
1503 }
1504
1505 return (error);
1506 }
1507
1508 static void
vtnet_rxq_free_mbufs(struct vtnet_rxq * rxq)1509 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq)
1510 {
1511 struct virtqueue *vq;
1512 struct mbuf *m;
1513 int last;
1514 #ifdef DEV_NETMAP
1515 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp),
1516 rxq->vtnrx_id, NR_RX);
1517 #else /* !DEV_NETMAP */
1518 void *kring = NULL;
1519 #endif /* !DEV_NETMAP */
1520
1521 vq = rxq->vtnrx_vq;
1522 last = 0;
1523
1524 while ((m = virtqueue_drain(vq, &last)) != NULL) {
1525 if (kring == NULL)
1526 m_freem(m);
1527 }
1528
1529 KASSERT(virtqueue_empty(vq),
1530 ("%s: mbufs remaining in rx queue %p", __func__, rxq));
1531 }
1532
1533 static struct mbuf *
vtnet_rx_alloc_buf(struct vtnet_softc * sc,int nbufs,struct mbuf ** m_tailp)1534 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
1535 {
1536 struct mbuf *m_head, *m_tail, *m;
1537 int i, size;
1538
1539 m_head = NULL;
1540 size = sc->vtnet_rx_clustersz;
1541
1542 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1543 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs));
1544
1545 for (i = 0; i < nbufs; i++) {
1546 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size);
1547 if (m == NULL) {
1548 sc->vtnet_stats.mbuf_alloc_failed++;
1549 m_freem(m_head);
1550 return (NULL);
1551 }
1552
1553 m->m_len = size;
1554 /*
1555 * Need to offset the mbuf if the header we're going to add
1556 * will misalign.
1557 */
1558 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) {
1559 m_adj(m, VTNET_ETHER_ALIGN);
1560 }
1561 if (m_head != NULL) {
1562 m_tail->m_next = m;
1563 m_tail = m;
1564 } else
1565 m_head = m_tail = m;
1566 }
1567
1568 if (m_tailp != NULL)
1569 *m_tailp = m_tail;
1570
1571 return (m_head);
1572 }
1573
1574 /*
1575 * Slow path for when LRO without mergeable buffers is negotiated.
1576 */
1577 static int
vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq * rxq,struct mbuf * m0,int len0)1578 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0,
1579 int len0)
1580 {
1581 struct vtnet_softc *sc;
1582 struct mbuf *m, *m_prev, *m_new, *m_tail;
1583 int len, clustersz, nreplace, error;
1584
1585 sc = rxq->vtnrx_sc;
1586 clustersz = sc->vtnet_rx_clustersz;
1587 /*
1588 * Need to offset the mbuf if the header we're going to add will
1589 * misalign, account for that here.
1590 */
1591 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0)
1592 clustersz -= VTNET_ETHER_ALIGN;
1593
1594 m_prev = NULL;
1595 m_tail = NULL;
1596 nreplace = 0;
1597
1598 m = m0;
1599 len = len0;
1600
1601 /*
1602 * Since these mbuf chains are so large, avoid allocating a complete
1603 * replacement when the received frame did not consume the entire
1604 * chain. Unused mbufs are moved to the tail of the replacement mbuf.
1605 */
1606 while (len > 0) {
1607 if (m == NULL) {
1608 sc->vtnet_stats.rx_frame_too_large++;
1609 return (EMSGSIZE);
1610 }
1611
1612 /*
1613 * Every mbuf should have the expected cluster size since that
1614 * is also used to allocate the replacements.
1615 */
1616 KASSERT(m->m_len == clustersz,
1617 ("%s: mbuf size %d not expected cluster size %d", __func__,
1618 m->m_len, clustersz));
1619
1620 m->m_len = MIN(m->m_len, len);
1621 len -= m->m_len;
1622
1623 m_prev = m;
1624 m = m->m_next;
1625 nreplace++;
1626 }
1627
1628 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs,
1629 ("%s: invalid replacement mbuf count %d max %d", __func__,
1630 nreplace, sc->vtnet_rx_nmbufs));
1631
1632 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail);
1633 if (m_new == NULL) {
1634 m_prev->m_len = clustersz;
1635 return (ENOBUFS);
1636 }
1637
1638 /*
1639 * Move any unused mbufs from the received mbuf chain onto the
1640 * end of the replacement chain.
1641 */
1642 if (m_prev->m_next != NULL) {
1643 m_tail->m_next = m_prev->m_next;
1644 m_prev->m_next = NULL;
1645 }
1646
1647 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1648 if (error) {
1649 /*
1650 * The replacement is suppose to be an copy of the one
1651 * dequeued so this is a very unexpected error.
1652 *
1653 * Restore the m0 chain to the original state if it was
1654 * modified so we can then discard it.
1655 */
1656 if (m_tail->m_next != NULL) {
1657 m_prev->m_next = m_tail->m_next;
1658 m_tail->m_next = NULL;
1659 }
1660 m_prev->m_len = clustersz;
1661 sc->vtnet_stats.rx_enq_replacement_failed++;
1662 m_freem(m_new);
1663 }
1664
1665 return (error);
1666 }
1667
1668 static int
vtnet_rxq_replace_buf(struct vtnet_rxq * rxq,struct mbuf * m,int len)1669 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len)
1670 {
1671 struct vtnet_softc *sc;
1672 struct mbuf *m_new;
1673 int error;
1674
1675 sc = rxq->vtnrx_sc;
1676
1677 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1678 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len));
1679
1680 MPASS(m->m_next == NULL);
1681 if (m->m_len < len)
1682 return (EMSGSIZE);
1683
1684 m_new = vtnet_rx_alloc_buf(sc, 1, NULL);
1685 if (m_new == NULL)
1686 return (ENOBUFS);
1687
1688 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1689 if (error) {
1690 sc->vtnet_stats.rx_enq_replacement_failed++;
1691 m_freem(m_new);
1692 } else
1693 m->m_len = len;
1694
1695 return (error);
1696 }
1697
1698 static int
vtnet_rxq_enqueue_buf(struct vtnet_rxq * rxq,struct mbuf * m)1699 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1700 {
1701 struct vtnet_softc *sc;
1702 struct sglist *sg;
1703 int header_inlined, error;
1704
1705 sc = rxq->vtnrx_sc;
1706 sg = rxq->vtnrx_sg;
1707
1708 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1709 ("%s: mbuf chain without LRO_NOMRG", __func__));
1710 VTNET_RXQ_LOCK_ASSERT(rxq);
1711
1712 sglist_reset(sg);
1713 header_inlined = vtnet_modern(sc) ||
1714 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */
1715
1716 /*
1717 * Note: The mbuf has been already adjusted when we allocate it if we
1718 * have to do strict alignment.
1719 */
1720 if (header_inlined)
1721 error = sglist_append_mbuf(sg, m);
1722 else {
1723 struct vtnet_rx_header *rxhdr =
1724 mtod(m, struct vtnet_rx_header *);
1725 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr));
1726
1727 /* Append the header and remaining mbuf data. */
1728 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size);
1729 if (error)
1730 return (error);
1731 error = sglist_append(sg, &rxhdr[1],
1732 m->m_len - sizeof(struct vtnet_rx_header));
1733 if (error)
1734 return (error);
1735
1736 if (m->m_next != NULL)
1737 error = sglist_append_mbuf(sg, m->m_next);
1738 }
1739
1740 if (error)
1741 return (error);
1742
1743 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg));
1744 }
1745
1746 static int
vtnet_rxq_new_buf(struct vtnet_rxq * rxq)1747 vtnet_rxq_new_buf(struct vtnet_rxq *rxq)
1748 {
1749 struct vtnet_softc *sc;
1750 struct mbuf *m;
1751 int error;
1752
1753 sc = rxq->vtnrx_sc;
1754
1755 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL);
1756 if (m == NULL)
1757 return (ENOBUFS);
1758
1759 error = vtnet_rxq_enqueue_buf(rxq, m);
1760 if (error)
1761 m_freem(m);
1762
1763 return (error);
1764 }
1765
1766 #if defined(INET) || defined(INET6)
1767 static int
vtnet_rxq_csum_needs_csum(struct vtnet_rxq * rxq,struct mbuf * m,bool isipv6,int protocol,struct virtio_net_hdr * hdr)1768 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, bool isipv6,
1769 int protocol, struct virtio_net_hdr *hdr)
1770 {
1771 struct vtnet_softc *sc;
1772
1773 /*
1774 * The packet is likely from another VM on the same host or from the
1775 * host that itself performed checksum offloading so Tx/Rx is basically
1776 * a memcpy and the checksum has little value so far.
1777 */
1778
1779 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP,
1780 ("%s: unsupported IP protocol %d", __func__, protocol));
1781
1782 /*
1783 * If the user don't want us to fix it up here by computing the
1784 * checksum, just forward the order to compute the checksum by setting
1785 * the corresponding mbuf flag (e.g., CSUM_TCP).
1786 */
1787 sc = rxq->vtnrx_sc;
1788 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) {
1789 switch (protocol) {
1790 case IPPROTO_TCP:
1791 m->m_pkthdr.csum_flags |=
1792 (isipv6 ? CSUM_TCP_IPV6 : CSUM_TCP);
1793 break;
1794 case IPPROTO_UDP:
1795 m->m_pkthdr.csum_flags |=
1796 (isipv6 ? CSUM_UDP_IPV6 : CSUM_UDP);
1797 break;
1798 }
1799 m->m_pkthdr.csum_data = hdr->csum_offset;
1800 return (0);
1801 }
1802
1803 /*
1804 * Compute the checksum in the driver so the packet will contain a
1805 * valid checksum. The checksum is at csum_offset from csum_start.
1806 */
1807 int csum_off, csum_end;
1808 uint16_t csum;
1809
1810 csum_off = hdr->csum_start + hdr->csum_offset;
1811 csum_end = csum_off + sizeof(uint16_t);
1812
1813 /* Assume checksum will be in the first mbuf. */
1814 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) {
1815 sc->vtnet_stats.rx_csum_bad_offset++;
1816 return (1);
1817 }
1818
1819 /*
1820 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the
1821 * checksum and write it at the specified offset. We could
1822 * try to verify the packet: csum_start should probably
1823 * correspond to the start of the TCP/UDP header.
1824 *
1825 * BMV: Need to properly handle UDP with zero checksum. Is
1826 * the IPv4 header checksum implicitly validated?
1827 */
1828 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start);
1829 *(uint16_t *)(mtodo(m, csum_off)) = csum;
1830 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1831 m->m_pkthdr.csum_data = 0xFFFF;
1832
1833 return (0);
1834 }
1835
1836 static void
vtnet_rxq_csum_data_valid(struct vtnet_rxq * rxq,struct mbuf * m,int protocol)1837 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, int protocol)
1838 {
1839 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP,
1840 ("%s: unsupported IP protocol %d", __func__, protocol));
1841
1842 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1843 m->m_pkthdr.csum_data = 0xFFFF;
1844 }
1845
1846 static int
vtnet_rxq_csum(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)1847 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m,
1848 struct virtio_net_hdr *hdr)
1849 {
1850 const struct ether_header *eh;
1851 struct vtnet_softc *sc;
1852 int hoff, protocol;
1853 uint16_t etype;
1854 bool isipv6;
1855
1856 KASSERT(hdr->flags &
1857 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID),
1858 ("%s: missing checksum offloading flag %x", __func__, hdr->flags));
1859
1860 eh = mtod(m, const struct ether_header *);
1861 etype = ntohs(eh->ether_type);
1862 if (etype == ETHERTYPE_VLAN) {
1863 /* TODO BMV: Handle QinQ. */
1864 const struct ether_vlan_header *evh =
1865 mtod(m, const struct ether_vlan_header *);
1866 etype = ntohs(evh->evl_proto);
1867 hoff = sizeof(struct ether_vlan_header);
1868 } else
1869 hoff = sizeof(struct ether_header);
1870
1871 sc = rxq->vtnrx_sc;
1872
1873 /* Check whether ethernet type is IP or IPv6, and get protocol. */
1874 switch (etype) {
1875 #if defined(INET)
1876 case ETHERTYPE_IP:
1877 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) {
1878 sc->vtnet_stats.rx_csum_inaccessible_ipproto++;
1879 return (1);
1880 } else {
1881 struct ip *ip = (struct ip *)(m->m_data + hoff);
1882 protocol = ip->ip_p;
1883 }
1884 isipv6 = false;
1885 break;
1886 #endif
1887 #if defined(INET6)
1888 case ETHERTYPE_IPV6:
1889 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr))
1890 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) {
1891 sc->vtnet_stats.rx_csum_inaccessible_ipproto++;
1892 return (1);
1893 }
1894 isipv6 = true;
1895 break;
1896 #endif
1897 default:
1898 sc->vtnet_stats.rx_csum_bad_ethtype++;
1899 return (1);
1900 }
1901
1902 /* Check whether protocol is TCP or UDP. */
1903 switch (protocol) {
1904 case IPPROTO_TCP:
1905 case IPPROTO_UDP:
1906 break;
1907 default:
1908 /*
1909 * FreeBSD does not support checksum offloading of this
1910 * protocol here.
1911 */
1912 sc->vtnet_stats.rx_csum_bad_ipproto++;
1913 return (1);
1914 }
1915
1916 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
1917 return (vtnet_rxq_csum_needs_csum(rxq, m, isipv6, protocol,
1918 hdr));
1919 else /* VIRTIO_NET_HDR_F_DATA_VALID */
1920 vtnet_rxq_csum_data_valid(rxq, m, protocol);
1921
1922 return (0);
1923 }
1924 #endif
1925
1926 static void
vtnet_rxq_discard_merged_bufs(struct vtnet_rxq * rxq,int nbufs)1927 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs)
1928 {
1929 struct mbuf *m;
1930
1931 while (--nbufs > 0) {
1932 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL);
1933 if (m == NULL)
1934 break;
1935 vtnet_rxq_discard_buf(rxq, m);
1936 }
1937 }
1938
1939 static void
vtnet_rxq_discard_buf(struct vtnet_rxq * rxq,struct mbuf * m)1940 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1941 {
1942 int error __diagused;
1943
1944 /*
1945 * Requeue the discarded mbuf. This should always be successful
1946 * since it was just dequeued.
1947 */
1948 error = vtnet_rxq_enqueue_buf(rxq, m);
1949 KASSERT(error == 0,
1950 ("%s: cannot requeue discarded mbuf %d", __func__, error));
1951 }
1952
1953 static int
vtnet_rxq_merged_eof(struct vtnet_rxq * rxq,struct mbuf * m_head,int nbufs)1954 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs)
1955 {
1956 struct vtnet_softc *sc;
1957 struct virtqueue *vq;
1958 struct mbuf *m_tail;
1959
1960 sc = rxq->vtnrx_sc;
1961 vq = rxq->vtnrx_vq;
1962 m_tail = m_head;
1963
1964 while (--nbufs > 0) {
1965 struct mbuf *m;
1966 uint32_t len;
1967
1968 m = virtqueue_dequeue(vq, &len);
1969 if (m == NULL) {
1970 rxq->vtnrx_stats.vrxs_ierrors++;
1971 goto fail;
1972 }
1973
1974 if (vtnet_rxq_new_buf(rxq) != 0) {
1975 rxq->vtnrx_stats.vrxs_iqdrops++;
1976 vtnet_rxq_discard_buf(rxq, m);
1977 if (nbufs > 1)
1978 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
1979 goto fail;
1980 }
1981
1982 if (m->m_len < len)
1983 len = m->m_len;
1984
1985 m->m_len = len;
1986 m->m_flags &= ~M_PKTHDR;
1987
1988 m_head->m_pkthdr.len += len;
1989 m_tail->m_next = m;
1990 m_tail = m;
1991 }
1992
1993 return (0);
1994
1995 fail:
1996 sc->vtnet_stats.rx_mergeable_failed++;
1997 m_freem(m_head);
1998
1999 return (1);
2000 }
2001
2002 #if defined(INET) || defined(INET6)
2003 static int
vtnet_lro_rx(struct vtnet_rxq * rxq,struct mbuf * m)2004 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m)
2005 {
2006 struct lro_ctrl *lro;
2007
2008 lro = &rxq->vtnrx_lro;
2009
2010 if (lro->lro_mbuf_max != 0) {
2011 tcp_lro_queue_mbuf(lro, m);
2012 return (0);
2013 }
2014
2015 return (tcp_lro_rx(lro, m, 0));
2016 }
2017 #endif
2018
2019 static void
vtnet_rxq_input(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)2020 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m,
2021 struct virtio_net_hdr *hdr)
2022 {
2023 struct vtnet_softc *sc;
2024 if_t ifp;
2025
2026 sc = rxq->vtnrx_sc;
2027 ifp = sc->vtnet_ifp;
2028
2029 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) {
2030 struct ether_header *eh = mtod(m, struct ether_header *);
2031 if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
2032 vtnet_vlan_tag_remove(m);
2033 /*
2034 * With the 802.1Q header removed, update the
2035 * checksum starting location accordingly.
2036 */
2037 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
2038 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN;
2039 }
2040 }
2041
2042 m->m_pkthdr.flowid = rxq->vtnrx_id;
2043 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
2044
2045 if (hdr->flags &
2046 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) {
2047 #if defined(INET) || defined(INET6)
2048 if (vtnet_rxq_csum(rxq, m, hdr) == 0)
2049 rxq->vtnrx_stats.vrxs_csum++;
2050 else
2051 rxq->vtnrx_stats.vrxs_csum_failed++;
2052 #else
2053 sc->vtnet_stats.rx_csum_bad_ethtype++;
2054 rxq->vtnrx_stats.vrxs_csum_failed++;
2055 #endif
2056 }
2057
2058 if (hdr->gso_size != 0) {
2059 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2060 case VIRTIO_NET_HDR_GSO_TCPV4:
2061 case VIRTIO_NET_HDR_GSO_TCPV6:
2062 m->m_pkthdr.lro_nsegs =
2063 howmany(m->m_pkthdr.len, hdr->gso_size);
2064 rxq->vtnrx_stats.vrxs_host_lro++;
2065 break;
2066 }
2067 }
2068
2069 rxq->vtnrx_stats.vrxs_ipackets++;
2070 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len;
2071
2072 #if defined(INET) || defined(INET6)
2073 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) {
2074 if (vtnet_lro_rx(rxq, m) == 0)
2075 return;
2076 }
2077 #endif
2078
2079 if_input(ifp, m);
2080 }
2081
2082 static int
vtnet_rxq_eof(struct vtnet_rxq * rxq)2083 vtnet_rxq_eof(struct vtnet_rxq *rxq)
2084 {
2085 struct virtio_net_hdr lhdr, *hdr;
2086 struct vtnet_softc *sc;
2087 if_t ifp;
2088 struct virtqueue *vq;
2089 int deq, count;
2090
2091 sc = rxq->vtnrx_sc;
2092 vq = rxq->vtnrx_vq;
2093 ifp = sc->vtnet_ifp;
2094 deq = 0;
2095 count = sc->vtnet_rx_process_limit;
2096
2097 VTNET_RXQ_LOCK_ASSERT(rxq);
2098
2099 CURVNET_SET(if_getvnet(ifp));
2100 while (count-- > 0) {
2101 struct mbuf *m;
2102 uint32_t len, nbufs, adjsz;
2103
2104 m = virtqueue_dequeue(vq, &len);
2105 if (m == NULL)
2106 break;
2107 deq++;
2108
2109 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) {
2110 rxq->vtnrx_stats.vrxs_ierrors++;
2111 vtnet_rxq_discard_buf(rxq, m);
2112 continue;
2113 }
2114
2115 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) {
2116 struct virtio_net_hdr_mrg_rxbuf *mhdr =
2117 mtod(m, struct virtio_net_hdr_mrg_rxbuf *);
2118 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED);
2119 nbufs = vtnet_htog16(sc, mhdr->num_buffers);
2120 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2121 } else if (vtnet_modern(sc)) {
2122 nbufs = 1; /* num_buffers is always 1 */
2123 adjsz = sizeof(struct virtio_net_hdr_v1);
2124 } else {
2125 nbufs = 1;
2126 adjsz = sizeof(struct vtnet_rx_header);
2127 /*
2128 * Account for our gap between the header and start of
2129 * data to keep the segments separated.
2130 */
2131 len += VTNET_RX_HEADER_PAD;
2132 }
2133
2134 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) {
2135 rxq->vtnrx_stats.vrxs_iqdrops++;
2136 vtnet_rxq_discard_buf(rxq, m);
2137 if (nbufs > 1)
2138 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
2139 continue;
2140 }
2141
2142 m->m_pkthdr.len = len;
2143 m->m_pkthdr.rcvif = ifp;
2144 m->m_pkthdr.csum_flags = 0;
2145
2146 if (nbufs > 1) {
2147 /* Dequeue the rest of chain. */
2148 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0)
2149 continue;
2150 }
2151
2152 kmsan_mark_mbuf(m, KMSAN_STATE_INITED);
2153
2154 /*
2155 * Save an endian swapped version of the header prior to it
2156 * being stripped. The header is always at the start of the
2157 * mbuf data. num_buffers was already saved (and not needed)
2158 * so use the standard header.
2159 */
2160 hdr = mtod(m, struct virtio_net_hdr *);
2161 lhdr.flags = hdr->flags;
2162 lhdr.gso_type = hdr->gso_type;
2163 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len);
2164 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size);
2165 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start);
2166 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset);
2167 m_adj(m, adjsz);
2168
2169 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) {
2170 pfil_return_t pfil;
2171
2172 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL);
2173 switch (pfil) {
2174 case PFIL_DROPPED:
2175 case PFIL_CONSUMED:
2176 continue;
2177 default:
2178 KASSERT(pfil == PFIL_PASS,
2179 ("Filter returned %d!", pfil));
2180 }
2181 }
2182
2183 vtnet_rxq_input(rxq, m, &lhdr);
2184 }
2185
2186 if (deq > 0) {
2187 #if defined(INET) || defined(INET6)
2188 if (vtnet_software_lro(sc))
2189 tcp_lro_flush_all(&rxq->vtnrx_lro);
2190 #endif
2191 virtqueue_notify(vq);
2192 }
2193 CURVNET_RESTORE();
2194
2195 return (count > 0 ? 0 : EAGAIN);
2196 }
2197
2198 static void
vtnet_rx_vq_process(struct vtnet_rxq * rxq,int tries)2199 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries)
2200 {
2201 struct vtnet_softc *sc;
2202 if_t ifp;
2203 u_int more;
2204 #ifdef DEV_NETMAP
2205 int nmirq;
2206 #endif /* DEV_NETMAP */
2207
2208 sc = rxq->vtnrx_sc;
2209 ifp = sc->vtnet_ifp;
2210
2211 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) {
2212 /*
2213 * Ignore this interrupt. Either this is a spurious interrupt
2214 * or multiqueue without per-VQ MSIX so every queue needs to
2215 * be polled (a brain dead configuration we could try harder
2216 * to avoid).
2217 */
2218 vtnet_rxq_disable_intr(rxq);
2219 return;
2220 }
2221
2222 VTNET_RXQ_LOCK(rxq);
2223
2224 #ifdef DEV_NETMAP
2225 /*
2226 * We call netmap_rx_irq() under lock to prevent concurrent calls.
2227 * This is not necessary to serialize the access to the RX vq, but
2228 * rather to avoid races that may happen if this interface is
2229 * attached to a VALE switch, which would cause received packets
2230 * to stall in the RX queue (nm_kr_tryget() could find the kring
2231 * busy when called from netmap_bwrap_intr_notify()).
2232 */
2233 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more);
2234 if (nmirq != NM_IRQ_PASS) {
2235 VTNET_RXQ_UNLOCK(rxq);
2236 if (nmirq == NM_IRQ_RESCHED) {
2237 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2238 }
2239 return;
2240 }
2241 #endif /* DEV_NETMAP */
2242
2243 again:
2244 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2245 VTNET_RXQ_UNLOCK(rxq);
2246 return;
2247 }
2248
2249 more = vtnet_rxq_eof(rxq);
2250 if (more || vtnet_rxq_enable_intr(rxq) != 0) {
2251 if (!more)
2252 vtnet_rxq_disable_intr(rxq);
2253 /*
2254 * This is an occasional condition or race (when !more),
2255 * so retry a few times before scheduling the taskqueue.
2256 */
2257 if (tries-- > 0)
2258 goto again;
2259
2260 rxq->vtnrx_stats.vrxs_rescheduled++;
2261 VTNET_RXQ_UNLOCK(rxq);
2262 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2263 } else
2264 VTNET_RXQ_UNLOCK(rxq);
2265 }
2266
2267 static void
vtnet_rx_vq_intr(void * xrxq)2268 vtnet_rx_vq_intr(void *xrxq)
2269 {
2270 struct vtnet_rxq *rxq;
2271
2272 rxq = xrxq;
2273 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES);
2274 }
2275
2276 static void
vtnet_rxq_tq_intr(void * xrxq,int pending __unused)2277 vtnet_rxq_tq_intr(void *xrxq, int pending __unused)
2278 {
2279 struct vtnet_rxq *rxq;
2280
2281 rxq = xrxq;
2282 vtnet_rx_vq_process(rxq, 0);
2283 }
2284
2285 static int
vtnet_txq_intr_threshold(struct vtnet_txq * txq)2286 vtnet_txq_intr_threshold(struct vtnet_txq *txq)
2287 {
2288 struct vtnet_softc *sc;
2289 int threshold;
2290
2291 sc = txq->vtntx_sc;
2292
2293 /*
2294 * The Tx interrupt is disabled until the queue free count falls
2295 * below our threshold. Completed frames are drained from the Tx
2296 * virtqueue before transmitting new frames and in the watchdog
2297 * callout, so the frequency of Tx interrupts is greatly reduced,
2298 * at the cost of not freeing mbufs as quickly as they otherwise
2299 * would be.
2300 */
2301 threshold = virtqueue_size(txq->vtntx_vq) / 4;
2302
2303 /*
2304 * Without indirect descriptors, leave enough room for the most
2305 * segments we handle.
2306 */
2307 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 &&
2308 threshold < sc->vtnet_tx_nsegs)
2309 threshold = sc->vtnet_tx_nsegs;
2310
2311 return (threshold);
2312 }
2313
2314 static int
vtnet_txq_below_threshold(struct vtnet_txq * txq)2315 vtnet_txq_below_threshold(struct vtnet_txq *txq)
2316 {
2317 struct virtqueue *vq;
2318
2319 vq = txq->vtntx_vq;
2320
2321 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold);
2322 }
2323
2324 static int
vtnet_txq_notify(struct vtnet_txq * txq)2325 vtnet_txq_notify(struct vtnet_txq *txq)
2326 {
2327 struct virtqueue *vq;
2328
2329 vq = txq->vtntx_vq;
2330
2331 txq->vtntx_watchdog = VTNET_TX_TIMEOUT;
2332 virtqueue_notify(vq);
2333
2334 if (vtnet_txq_enable_intr(txq) == 0)
2335 return (0);
2336
2337 /*
2338 * Drain frames that were completed since last checked. If this
2339 * causes the queue to go above the threshold, the caller should
2340 * continue transmitting.
2341 */
2342 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) {
2343 virtqueue_disable_intr(vq);
2344 return (1);
2345 }
2346
2347 return (0);
2348 }
2349
2350 static void
vtnet_txq_free_mbufs(struct vtnet_txq * txq)2351 vtnet_txq_free_mbufs(struct vtnet_txq *txq)
2352 {
2353 struct virtqueue *vq;
2354 struct vtnet_tx_header *txhdr;
2355 int last;
2356 #ifdef DEV_NETMAP
2357 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp),
2358 txq->vtntx_id, NR_TX);
2359 #else /* !DEV_NETMAP */
2360 void *kring = NULL;
2361 #endif /* !DEV_NETMAP */
2362
2363 vq = txq->vtntx_vq;
2364 last = 0;
2365
2366 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) {
2367 if (kring == NULL) {
2368 m_freem(txhdr->vth_mbuf);
2369 uma_zfree(vtnet_tx_header_zone, txhdr);
2370 }
2371 }
2372
2373 KASSERT(virtqueue_empty(vq),
2374 ("%s: mbufs remaining in tx queue %p", __func__, txq));
2375 }
2376
2377 /*
2378 * BMV: This can go away once we finally have offsets in the mbuf header.
2379 */
2380 static int
vtnet_txq_offload_ctx(struct vtnet_txq * txq,struct mbuf * m,int * etype,int * proto,int * start)2381 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype,
2382 int *proto, int *start)
2383 {
2384 struct vtnet_softc *sc;
2385 struct ether_vlan_header *evh;
2386 #if defined(INET) || defined(INET6)
2387 int offset;
2388 #endif
2389
2390 sc = txq->vtntx_sc;
2391
2392 evh = mtod(m, struct ether_vlan_header *);
2393 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
2394 /* BMV: We should handle nested VLAN tags too. */
2395 *etype = ntohs(evh->evl_proto);
2396 #if defined(INET) || defined(INET6)
2397 offset = sizeof(struct ether_vlan_header);
2398 #endif
2399 } else {
2400 *etype = ntohs(evh->evl_encap_proto);
2401 #if defined(INET) || defined(INET6)
2402 offset = sizeof(struct ether_header);
2403 #endif
2404 }
2405
2406 switch (*etype) {
2407 #if defined(INET)
2408 case ETHERTYPE_IP: {
2409 struct ip *ip, iphdr;
2410 if (__predict_false(m->m_len < offset + sizeof(struct ip))) {
2411 m_copydata(m, offset, sizeof(struct ip),
2412 (caddr_t) &iphdr);
2413 ip = &iphdr;
2414 } else
2415 ip = (struct ip *)(m->m_data + offset);
2416 *proto = ip->ip_p;
2417 *start = offset + (ip->ip_hl << 2);
2418 break;
2419 }
2420 #endif
2421 #if defined(INET6)
2422 case ETHERTYPE_IPV6:
2423 *proto = -1;
2424 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto);
2425 /* Assert the network stack sent us a valid packet. */
2426 KASSERT(*start > offset,
2427 ("%s: mbuf %p start %d offset %d proto %d", __func__, m,
2428 *start, offset, *proto));
2429 break;
2430 #endif
2431 default:
2432 sc->vtnet_stats.tx_csum_unknown_ethtype++;
2433 return (EINVAL);
2434 }
2435
2436 return (0);
2437 }
2438
2439 static int
vtnet_txq_offload_tso(struct vtnet_txq * txq,struct mbuf * m,int eth_type,int offset,struct virtio_net_hdr * hdr)2440 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type,
2441 int offset, struct virtio_net_hdr *hdr)
2442 {
2443 static struct timeval lastecn;
2444 static int curecn;
2445 struct vtnet_softc *sc;
2446 struct tcphdr *tcp, tcphdr;
2447
2448 sc = txq->vtntx_sc;
2449
2450 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) {
2451 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr);
2452 tcp = &tcphdr;
2453 } else
2454 tcp = (struct tcphdr *)(m->m_data + offset);
2455
2456 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2));
2457 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz);
2458 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 :
2459 VIRTIO_NET_HDR_GSO_TCPV6;
2460
2461 if (__predict_false(tcp_get_flags(tcp) & TH_CWR)) {
2462 /*
2463 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In
2464 * FreeBSD, ECN support is not on a per-interface basis,
2465 * but globally via the net.inet.tcp.ecn.enable sysctl
2466 * knob. The default is off.
2467 */
2468 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) {
2469 if (ppsratecheck(&lastecn, &curecn, 1))
2470 if_printf(sc->vtnet_ifp,
2471 "TSO with ECN not negotiated with host\n");
2472 return (ENOTSUP);
2473 }
2474 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2475 }
2476
2477 txq->vtntx_stats.vtxs_tso++;
2478
2479 return (0);
2480 }
2481
2482 static struct mbuf *
vtnet_txq_offload(struct vtnet_txq * txq,struct mbuf * m,struct virtio_net_hdr * hdr)2483 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m,
2484 struct virtio_net_hdr *hdr)
2485 {
2486 struct vtnet_softc *sc;
2487 int flags, etype, csum_start, proto, error;
2488
2489 sc = txq->vtntx_sc;
2490 flags = m->m_pkthdr.csum_flags;
2491
2492 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start);
2493 if (error)
2494 goto drop;
2495
2496 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) {
2497 /* Sanity check the parsed mbuf matches the offload flags. */
2498 if (__predict_false((flags & VTNET_CSUM_OFFLOAD &&
2499 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6
2500 && etype != ETHERTYPE_IPV6))) {
2501 sc->vtnet_stats.tx_csum_proto_mismatch++;
2502 goto drop;
2503 }
2504
2505 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
2506 hdr->csum_start = vtnet_gtoh16(sc, csum_start);
2507 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data);
2508 txq->vtntx_stats.vtxs_csum++;
2509 } else if ((flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) &&
2510 (proto == IPPROTO_TCP || proto == IPPROTO_UDP) &&
2511 (m->m_pkthdr.csum_data == 0xFFFF)) {
2512 hdr->flags |= VIRTIO_NET_HDR_F_DATA_VALID;
2513 }
2514
2515 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) {
2516 /*
2517 * Sanity check the parsed mbuf IP protocol is TCP, and
2518 * VirtIO TSO reqires the checksum offloading above.
2519 */
2520 if (__predict_false(proto != IPPROTO_TCP)) {
2521 sc->vtnet_stats.tx_tso_not_tcp++;
2522 goto drop;
2523 } else if (__predict_false((hdr->flags &
2524 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) {
2525 sc->vtnet_stats.tx_tso_without_csum++;
2526 goto drop;
2527 }
2528
2529 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr);
2530 if (error)
2531 goto drop;
2532 }
2533
2534 return (m);
2535
2536 drop:
2537 m_freem(m);
2538 return (NULL);
2539 }
2540
2541 static int
vtnet_txq_enqueue_buf(struct vtnet_txq * txq,struct mbuf ** m_head,struct vtnet_tx_header * txhdr)2542 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head,
2543 struct vtnet_tx_header *txhdr)
2544 {
2545 struct vtnet_softc *sc;
2546 struct virtqueue *vq;
2547 struct sglist *sg;
2548 struct mbuf *m;
2549 int error;
2550
2551 sc = txq->vtntx_sc;
2552 vq = txq->vtntx_vq;
2553 sg = txq->vtntx_sg;
2554 m = *m_head;
2555
2556 sglist_reset(sg);
2557 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size);
2558 if (error != 0 || sg->sg_nseg != 1) {
2559 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d",
2560 __func__, error, sg->sg_nseg));
2561 goto fail;
2562 }
2563
2564 error = sglist_append_mbuf(sg, m);
2565 if (error) {
2566 m = m_defrag(m, M_NOWAIT);
2567 if (m == NULL) {
2568 sc->vtnet_stats.tx_defrag_failed++;
2569 goto fail;
2570 }
2571
2572 *m_head = m;
2573 sc->vtnet_stats.tx_defragged++;
2574
2575 error = sglist_append_mbuf(sg, m);
2576 if (error)
2577 goto fail;
2578 }
2579
2580 txhdr->vth_mbuf = m;
2581 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0);
2582
2583 return (error);
2584
2585 fail:
2586 m_freem(*m_head);
2587 *m_head = NULL;
2588
2589 return (ENOBUFS);
2590 }
2591
2592 static int
vtnet_txq_encap(struct vtnet_txq * txq,struct mbuf ** m_head,int flags)2593 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags)
2594 {
2595 struct vtnet_tx_header *txhdr;
2596 struct virtio_net_hdr *hdr;
2597 struct mbuf *m;
2598 int error;
2599
2600 m = *m_head;
2601 M_ASSERTPKTHDR(m);
2602
2603 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO);
2604 if (txhdr == NULL) {
2605 m_freem(m);
2606 *m_head = NULL;
2607 return (ENOMEM);
2608 }
2609
2610 /*
2611 * Always use the non-mergeable header, regardless if mergable headers
2612 * were negotiated, because for transmit num_buffers is always zero.
2613 * The vtnet_hdr_size is used to enqueue the right header size segment.
2614 */
2615 hdr = &txhdr->vth_uhdr.hdr;
2616
2617 if (m->m_flags & M_VLANTAG) {
2618 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2619 if ((*m_head = m) == NULL) {
2620 error = ENOBUFS;
2621 goto fail;
2622 }
2623 m->m_flags &= ~M_VLANTAG;
2624 }
2625
2626 if (m->m_pkthdr.csum_flags &
2627 (VTNET_CSUM_ALL_OFFLOAD | CSUM_DATA_VALID)) {
2628 m = vtnet_txq_offload(txq, m, hdr);
2629 if ((*m_head = m) == NULL) {
2630 error = ENOBUFS;
2631 goto fail;
2632 }
2633 }
2634
2635 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr);
2636 fail:
2637 if (error)
2638 uma_zfree(vtnet_tx_header_zone, txhdr);
2639
2640 return (error);
2641 }
2642
2643
2644 static void
vtnet_start_locked(struct vtnet_txq * txq,if_t ifp)2645 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp)
2646 {
2647 struct vtnet_softc *sc;
2648 struct virtqueue *vq;
2649 struct mbuf *m0;
2650 int tries, enq;
2651
2652 sc = txq->vtntx_sc;
2653 vq = txq->vtntx_vq;
2654 tries = 0;
2655
2656 VTNET_TXQ_LOCK_ASSERT(txq);
2657
2658 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 ||
2659 sc->vtnet_link_active == 0)
2660 return;
2661
2662 vtnet_txq_eof(txq);
2663
2664 again:
2665 enq = 0;
2666
2667 while (!if_sendq_empty(ifp)) {
2668 if (virtqueue_full(vq))
2669 break;
2670
2671 m0 = if_dequeue(ifp);
2672 if (m0 == NULL)
2673 break;
2674
2675 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) {
2676 if (m0 != NULL)
2677 if_sendq_prepend(ifp, m0);
2678 break;
2679 }
2680
2681 enq++;
2682 ETHER_BPF_MTAP(ifp, m0);
2683 }
2684
2685 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2686 if (tries++ < VTNET_NOTIFY_RETRIES)
2687 goto again;
2688
2689 txq->vtntx_stats.vtxs_rescheduled++;
2690 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2691 }
2692 }
2693
2694 static void
vtnet_start(if_t ifp)2695 vtnet_start(if_t ifp)
2696 {
2697 struct vtnet_softc *sc;
2698 struct vtnet_txq *txq;
2699
2700 sc = if_getsoftc(ifp);
2701 txq = &sc->vtnet_txqs[0];
2702
2703 VTNET_TXQ_LOCK(txq);
2704 vtnet_start_locked(txq, ifp);
2705 VTNET_TXQ_UNLOCK(txq);
2706 }
2707
2708
2709 static int
vtnet_txq_mq_start_locked(struct vtnet_txq * txq,struct mbuf * m)2710 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m)
2711 {
2712 struct vtnet_softc *sc;
2713 struct virtqueue *vq;
2714 struct buf_ring *br;
2715 if_t ifp;
2716 int enq, tries, error;
2717
2718 sc = txq->vtntx_sc;
2719 vq = txq->vtntx_vq;
2720 br = txq->vtntx_br;
2721 ifp = sc->vtnet_ifp;
2722 tries = 0;
2723 error = 0;
2724
2725 VTNET_TXQ_LOCK_ASSERT(txq);
2726
2727 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 ||
2728 sc->vtnet_link_active == 0) {
2729 if (m != NULL)
2730 error = drbr_enqueue(ifp, br, m);
2731 return (error);
2732 }
2733
2734 if (m != NULL) {
2735 error = drbr_enqueue(ifp, br, m);
2736 if (error)
2737 return (error);
2738 }
2739
2740 vtnet_txq_eof(txq);
2741
2742 again:
2743 enq = 0;
2744
2745 while ((m = drbr_peek(ifp, br)) != NULL) {
2746 if (virtqueue_full(vq)) {
2747 drbr_putback(ifp, br, m);
2748 break;
2749 }
2750
2751 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) {
2752 if (m != NULL)
2753 drbr_putback(ifp, br, m);
2754 else
2755 drbr_advance(ifp, br);
2756 break;
2757 }
2758 drbr_advance(ifp, br);
2759
2760 enq++;
2761 ETHER_BPF_MTAP(ifp, m);
2762 }
2763
2764 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2765 if (tries++ < VTNET_NOTIFY_RETRIES)
2766 goto again;
2767
2768 txq->vtntx_stats.vtxs_rescheduled++;
2769 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2770 }
2771
2772 return (0);
2773 }
2774
2775 static int
vtnet_txq_mq_start(if_t ifp,struct mbuf * m)2776 vtnet_txq_mq_start(if_t ifp, struct mbuf *m)
2777 {
2778 struct vtnet_softc *sc;
2779 struct vtnet_txq *txq;
2780 int i, npairs, error;
2781
2782 sc = if_getsoftc(ifp);
2783 npairs = sc->vtnet_act_vq_pairs;
2784
2785 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
2786 i = m->m_pkthdr.flowid % npairs;
2787 else
2788 i = curcpu % npairs;
2789
2790 txq = &sc->vtnet_txqs[i];
2791
2792 if (VTNET_TXQ_TRYLOCK(txq) != 0) {
2793 error = vtnet_txq_mq_start_locked(txq, m);
2794 VTNET_TXQ_UNLOCK(txq);
2795 } else {
2796 error = drbr_enqueue(ifp, txq->vtntx_br, m);
2797 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask);
2798 }
2799
2800 return (error);
2801 }
2802
2803 static void
vtnet_txq_tq_deferred(void * xtxq,int pending __unused)2804 vtnet_txq_tq_deferred(void *xtxq, int pending __unused)
2805 {
2806 struct vtnet_softc *sc;
2807 struct vtnet_txq *txq;
2808
2809 txq = xtxq;
2810 sc = txq->vtntx_sc;
2811
2812 VTNET_TXQ_LOCK(txq);
2813 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br))
2814 vtnet_txq_mq_start_locked(txq, NULL);
2815 VTNET_TXQ_UNLOCK(txq);
2816 }
2817
2818
2819 static void
vtnet_txq_start(struct vtnet_txq * txq)2820 vtnet_txq_start(struct vtnet_txq *txq)
2821 {
2822 struct vtnet_softc *sc;
2823 if_t ifp;
2824
2825 sc = txq->vtntx_sc;
2826 ifp = sc->vtnet_ifp;
2827
2828 if (!VTNET_ALTQ_ENABLED) {
2829 if (!drbr_empty(ifp, txq->vtntx_br))
2830 vtnet_txq_mq_start_locked(txq, NULL);
2831 } else {
2832 if (!if_sendq_empty(ifp))
2833 vtnet_start_locked(txq, ifp);
2834
2835 }
2836 }
2837
2838 static void
vtnet_txq_tq_intr(void * xtxq,int pending __unused)2839 vtnet_txq_tq_intr(void *xtxq, int pending __unused)
2840 {
2841 struct vtnet_softc *sc;
2842 struct vtnet_txq *txq;
2843 if_t ifp;
2844
2845 txq = xtxq;
2846 sc = txq->vtntx_sc;
2847 ifp = sc->vtnet_ifp;
2848
2849 VTNET_TXQ_LOCK(txq);
2850
2851 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2852 VTNET_TXQ_UNLOCK(txq);
2853 return;
2854 }
2855
2856 vtnet_txq_eof(txq);
2857 vtnet_txq_start(txq);
2858
2859 VTNET_TXQ_UNLOCK(txq);
2860 }
2861
2862 static int
vtnet_txq_eof(struct vtnet_txq * txq)2863 vtnet_txq_eof(struct vtnet_txq *txq)
2864 {
2865 struct virtqueue *vq;
2866 struct vtnet_tx_header *txhdr;
2867 struct mbuf *m;
2868 int deq;
2869
2870 vq = txq->vtntx_vq;
2871 deq = 0;
2872 VTNET_TXQ_LOCK_ASSERT(txq);
2873
2874 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) {
2875 m = txhdr->vth_mbuf;
2876 deq++;
2877
2878 txq->vtntx_stats.vtxs_opackets++;
2879 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len;
2880 if (m->m_flags & M_MCAST)
2881 txq->vtntx_stats.vtxs_omcasts++;
2882
2883 m_freem(m);
2884 uma_zfree(vtnet_tx_header_zone, txhdr);
2885 }
2886
2887 if (virtqueue_empty(vq))
2888 txq->vtntx_watchdog = 0;
2889
2890 return (deq);
2891 }
2892
2893 static void
vtnet_tx_vq_intr(void * xtxq)2894 vtnet_tx_vq_intr(void *xtxq)
2895 {
2896 struct vtnet_softc *sc;
2897 struct vtnet_txq *txq;
2898 if_t ifp;
2899
2900 txq = xtxq;
2901 sc = txq->vtntx_sc;
2902 ifp = sc->vtnet_ifp;
2903
2904 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) {
2905 /*
2906 * Ignore this interrupt. Either this is a spurious interrupt
2907 * or multiqueue without per-VQ MSIX so every queue needs to
2908 * be polled (a brain dead configuration we could try harder
2909 * to avoid).
2910 */
2911 vtnet_txq_disable_intr(txq);
2912 return;
2913 }
2914
2915 #ifdef DEV_NETMAP
2916 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS)
2917 return;
2918 #endif /* DEV_NETMAP */
2919
2920 VTNET_TXQ_LOCK(txq);
2921
2922 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2923 VTNET_TXQ_UNLOCK(txq);
2924 return;
2925 }
2926
2927 vtnet_txq_eof(txq);
2928 vtnet_txq_start(txq);
2929
2930 VTNET_TXQ_UNLOCK(txq);
2931 }
2932
2933 static void
vtnet_tx_start_all(struct vtnet_softc * sc)2934 vtnet_tx_start_all(struct vtnet_softc *sc)
2935 {
2936 struct vtnet_txq *txq;
2937 int i;
2938
2939 VTNET_CORE_LOCK_ASSERT(sc);
2940
2941 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2942 txq = &sc->vtnet_txqs[i];
2943
2944 VTNET_TXQ_LOCK(txq);
2945 vtnet_txq_start(txq);
2946 VTNET_TXQ_UNLOCK(txq);
2947 }
2948 }
2949
2950 static void
vtnet_qflush(if_t ifp)2951 vtnet_qflush(if_t ifp)
2952 {
2953 struct vtnet_softc *sc;
2954 struct vtnet_txq *txq;
2955 struct mbuf *m;
2956 int i;
2957
2958 sc = if_getsoftc(ifp);
2959
2960 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2961 txq = &sc->vtnet_txqs[i];
2962
2963 VTNET_TXQ_LOCK(txq);
2964 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL)
2965 m_freem(m);
2966 VTNET_TXQ_UNLOCK(txq);
2967 }
2968
2969 if_qflush(ifp);
2970 }
2971
2972 static int
vtnet_watchdog(struct vtnet_txq * txq)2973 vtnet_watchdog(struct vtnet_txq *txq)
2974 {
2975 if_t ifp;
2976
2977 ifp = txq->vtntx_sc->vtnet_ifp;
2978
2979 VTNET_TXQ_LOCK(txq);
2980 if (txq->vtntx_watchdog == 1) {
2981 /*
2982 * Only drain completed frames if the watchdog is about to
2983 * expire. If any frames were drained, there may be enough
2984 * free descriptors now available to transmit queued frames.
2985 * In that case, the timer will immediately be decremented
2986 * below, but the timeout is generous enough that should not
2987 * be a problem.
2988 */
2989 if (vtnet_txq_eof(txq) != 0)
2990 vtnet_txq_start(txq);
2991 }
2992
2993 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) {
2994 VTNET_TXQ_UNLOCK(txq);
2995 return (0);
2996 }
2997 VTNET_TXQ_UNLOCK(txq);
2998
2999 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id);
3000 return (1);
3001 }
3002
3003 static void
vtnet_accum_stats(struct vtnet_softc * sc,struct vtnet_rxq_stats * rxacc,struct vtnet_txq_stats * txacc)3004 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc,
3005 struct vtnet_txq_stats *txacc)
3006 {
3007
3008 bzero(rxacc, sizeof(struct vtnet_rxq_stats));
3009 bzero(txacc, sizeof(struct vtnet_txq_stats));
3010
3011 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3012 struct vtnet_rxq_stats *rxst;
3013 struct vtnet_txq_stats *txst;
3014
3015 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
3016 rxacc->vrxs_ipackets += rxst->vrxs_ipackets;
3017 rxacc->vrxs_ibytes += rxst->vrxs_ibytes;
3018 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops;
3019 rxacc->vrxs_csum += rxst->vrxs_csum;
3020 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed;
3021 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled;
3022
3023 txst = &sc->vtnet_txqs[i].vtntx_stats;
3024 txacc->vtxs_opackets += txst->vtxs_opackets;
3025 txacc->vtxs_obytes += txst->vtxs_obytes;
3026 txacc->vtxs_csum += txst->vtxs_csum;
3027 txacc->vtxs_tso += txst->vtxs_tso;
3028 txacc->vtxs_rescheduled += txst->vtxs_rescheduled;
3029 }
3030 }
3031
3032 static uint64_t
vtnet_get_counter(if_t ifp,ift_counter cnt)3033 vtnet_get_counter(if_t ifp, ift_counter cnt)
3034 {
3035 struct vtnet_softc *sc;
3036 struct vtnet_rxq_stats rxaccum;
3037 struct vtnet_txq_stats txaccum;
3038
3039 sc = if_getsoftc(ifp);
3040 vtnet_accum_stats(sc, &rxaccum, &txaccum);
3041
3042 switch (cnt) {
3043 case IFCOUNTER_IPACKETS:
3044 return (rxaccum.vrxs_ipackets);
3045 case IFCOUNTER_IQDROPS:
3046 return (rxaccum.vrxs_iqdrops);
3047 case IFCOUNTER_IERRORS:
3048 return (rxaccum.vrxs_ierrors);
3049 case IFCOUNTER_IBYTES:
3050 return (rxaccum.vrxs_ibytes);
3051 case IFCOUNTER_OPACKETS:
3052 return (txaccum.vtxs_opackets);
3053 case IFCOUNTER_OBYTES:
3054 return (txaccum.vtxs_obytes);
3055 case IFCOUNTER_OMCASTS:
3056 return (txaccum.vtxs_omcasts);
3057 default:
3058 return (if_get_counter_default(ifp, cnt));
3059 }
3060 }
3061
3062 static void
vtnet_tick(void * xsc)3063 vtnet_tick(void *xsc)
3064 {
3065 struct vtnet_softc *sc;
3066 if_t ifp;
3067 int i, timedout;
3068
3069 sc = xsc;
3070 ifp = sc->vtnet_ifp;
3071 timedout = 0;
3072
3073 VTNET_CORE_LOCK_ASSERT(sc);
3074
3075 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
3076 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]);
3077
3078 if (timedout != 0) {
3079 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3080 vtnet_init_locked(sc, 0);
3081 } else
3082 callout_schedule(&sc->vtnet_tick_ch, hz);
3083 }
3084
3085 static void
vtnet_start_taskqueues(struct vtnet_softc * sc)3086 vtnet_start_taskqueues(struct vtnet_softc *sc)
3087 {
3088 device_t dev;
3089 struct vtnet_rxq *rxq;
3090 struct vtnet_txq *txq;
3091 int i, error;
3092
3093 dev = sc->vtnet_dev;
3094
3095 /*
3096 * Errors here are very difficult to recover from - we cannot
3097 * easily fail because, if this is during boot, we will hang
3098 * when freeing any successfully started taskqueues because
3099 * the scheduler isn't up yet.
3100 *
3101 * Most drivers just ignore the return value - it only fails
3102 * with ENOMEM so an error is not likely.
3103 */
3104 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
3105 rxq = &sc->vtnet_rxqs[i];
3106 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET,
3107 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id);
3108 if (error) {
3109 device_printf(dev, "failed to start rx taskq %d\n",
3110 rxq->vtnrx_id);
3111 }
3112
3113 txq = &sc->vtnet_txqs[i];
3114 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET,
3115 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id);
3116 if (error) {
3117 device_printf(dev, "failed to start tx taskq %d\n",
3118 txq->vtntx_id);
3119 }
3120 }
3121 }
3122
3123 static void
vtnet_free_taskqueues(struct vtnet_softc * sc)3124 vtnet_free_taskqueues(struct vtnet_softc *sc)
3125 {
3126 struct vtnet_rxq *rxq;
3127 struct vtnet_txq *txq;
3128 int i;
3129
3130 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3131 rxq = &sc->vtnet_rxqs[i];
3132 if (rxq->vtnrx_tq != NULL) {
3133 taskqueue_free(rxq->vtnrx_tq);
3134 rxq->vtnrx_tq = NULL;
3135 }
3136
3137 txq = &sc->vtnet_txqs[i];
3138 if (txq->vtntx_tq != NULL) {
3139 taskqueue_free(txq->vtntx_tq);
3140 txq->vtntx_tq = NULL;
3141 }
3142 }
3143 }
3144
3145 static void
vtnet_drain_taskqueues(struct vtnet_softc * sc)3146 vtnet_drain_taskqueues(struct vtnet_softc *sc)
3147 {
3148 struct vtnet_rxq *rxq;
3149 struct vtnet_txq *txq;
3150 int i;
3151
3152 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3153 rxq = &sc->vtnet_rxqs[i];
3154 if (rxq->vtnrx_tq != NULL)
3155 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
3156
3157 txq = &sc->vtnet_txqs[i];
3158 if (txq->vtntx_tq != NULL) {
3159 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask);
3160 if (!VTNET_ALTQ_ENABLED)
3161 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask);
3162 }
3163 }
3164 }
3165
3166 static void
vtnet_drain_rxtx_queues(struct vtnet_softc * sc)3167 vtnet_drain_rxtx_queues(struct vtnet_softc *sc)
3168 {
3169 struct vtnet_rxq *rxq;
3170 struct vtnet_txq *txq;
3171 int i;
3172
3173 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3174 rxq = &sc->vtnet_rxqs[i];
3175 vtnet_rxq_free_mbufs(rxq);
3176
3177 txq = &sc->vtnet_txqs[i];
3178 vtnet_txq_free_mbufs(txq);
3179 }
3180 }
3181
3182 static void
vtnet_stop_rendezvous(struct vtnet_softc * sc)3183 vtnet_stop_rendezvous(struct vtnet_softc *sc)
3184 {
3185 struct vtnet_rxq *rxq;
3186 struct vtnet_txq *txq;
3187 int i;
3188
3189 VTNET_CORE_LOCK_ASSERT(sc);
3190
3191 /*
3192 * Lock and unlock the per-queue mutex so we known the stop
3193 * state is visible. Doing only the active queues should be
3194 * sufficient, but it does not cost much extra to do all the
3195 * queues.
3196 */
3197 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3198 rxq = &sc->vtnet_rxqs[i];
3199 VTNET_RXQ_LOCK(rxq);
3200 VTNET_RXQ_UNLOCK(rxq);
3201
3202 txq = &sc->vtnet_txqs[i];
3203 VTNET_TXQ_LOCK(txq);
3204 VTNET_TXQ_UNLOCK(txq);
3205 }
3206 }
3207
3208 static void
vtnet_stop(struct vtnet_softc * sc)3209 vtnet_stop(struct vtnet_softc *sc)
3210 {
3211 device_t dev;
3212 if_t ifp;
3213
3214 dev = sc->vtnet_dev;
3215 ifp = sc->vtnet_ifp;
3216
3217 VTNET_CORE_LOCK_ASSERT(sc);
3218
3219 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3220 sc->vtnet_link_active = 0;
3221 callout_stop(&sc->vtnet_tick_ch);
3222
3223 /* Only advisory. */
3224 vtnet_disable_interrupts(sc);
3225
3226 #ifdef DEV_NETMAP
3227 /* Stop any pending txsync/rxsync and disable them. */
3228 netmap_disable_all_rings(ifp);
3229 #endif /* DEV_NETMAP */
3230
3231 /*
3232 * Stop the host adapter. This resets it to the pre-initialized
3233 * state. It will not generate any interrupts until after it is
3234 * reinitialized.
3235 */
3236 virtio_stop(dev);
3237 vtnet_stop_rendezvous(sc);
3238
3239 vtnet_drain_rxtx_queues(sc);
3240 sc->vtnet_act_vq_pairs = 1;
3241 }
3242
3243 static int
vtnet_virtio_reinit(struct vtnet_softc * sc)3244 vtnet_virtio_reinit(struct vtnet_softc *sc)
3245 {
3246 device_t dev;
3247 if_t ifp;
3248 uint64_t features;
3249 int error;
3250
3251 dev = sc->vtnet_dev;
3252 ifp = sc->vtnet_ifp;
3253 features = sc->vtnet_negotiated_features;
3254
3255 /*
3256 * Re-negotiate with the host, removing any disabled receive
3257 * features. Transmit features are disabled only on our side
3258 * via if_capenable and if_hwassist.
3259 */
3260
3261 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0)
3262 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES);
3263
3264 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0)
3265 features &= ~VTNET_LRO_FEATURES;
3266
3267 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0)
3268 features &= ~VIRTIO_NET_F_CTRL_VLAN;
3269
3270 error = virtio_reinit(dev, features);
3271 if (error) {
3272 device_printf(dev, "virtio reinit error %d\n", error);
3273 return (error);
3274 }
3275
3276 sc->vtnet_features = features;
3277 virtio_reinit_complete(dev);
3278
3279 return (0);
3280 }
3281
3282 static void
vtnet_init_rx_filters(struct vtnet_softc * sc)3283 vtnet_init_rx_filters(struct vtnet_softc *sc)
3284 {
3285 if_t ifp;
3286
3287 ifp = sc->vtnet_ifp;
3288
3289 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
3290 vtnet_rx_filter(sc);
3291 vtnet_rx_filter_mac(sc);
3292 }
3293
3294 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER)
3295 vtnet_rx_filter_vlan(sc);
3296 }
3297
3298 static int
vtnet_init_rx_queues(struct vtnet_softc * sc)3299 vtnet_init_rx_queues(struct vtnet_softc *sc)
3300 {
3301 device_t dev;
3302 if_t ifp;
3303 struct vtnet_rxq *rxq;
3304 int i, clustersz, error;
3305
3306 dev = sc->vtnet_dev;
3307 ifp = sc->vtnet_ifp;
3308
3309 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp));
3310 sc->vtnet_rx_clustersz = clustersz;
3311
3312 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) {
3313 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) +
3314 VTNET_MAX_RX_SIZE, clustersz);
3315 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs,
3316 ("%s: too many rx mbufs %d for %d segments", __func__,
3317 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs));
3318 } else
3319 sc->vtnet_rx_nmbufs = 1;
3320
3321 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3322 rxq = &sc->vtnet_rxqs[i];
3323
3324 /* Hold the lock to satisfy asserts. */
3325 VTNET_RXQ_LOCK(rxq);
3326 error = vtnet_rxq_populate(rxq);
3327 VTNET_RXQ_UNLOCK(rxq);
3328
3329 if (error) {
3330 device_printf(dev, "cannot populate Rx queue %d\n", i);
3331 return (error);
3332 }
3333 }
3334
3335 return (0);
3336 }
3337
3338 static int
vtnet_init_tx_queues(struct vtnet_softc * sc)3339 vtnet_init_tx_queues(struct vtnet_softc *sc)
3340 {
3341 struct vtnet_txq *txq;
3342 int i;
3343
3344 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3345 txq = &sc->vtnet_txqs[i];
3346 txq->vtntx_watchdog = 0;
3347 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq);
3348 #ifdef DEV_NETMAP
3349 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0);
3350 #endif /* DEV_NETMAP */
3351 }
3352
3353 return (0);
3354 }
3355
3356 static int
vtnet_init_rxtx_queues(struct vtnet_softc * sc)3357 vtnet_init_rxtx_queues(struct vtnet_softc *sc)
3358 {
3359 int error;
3360
3361 error = vtnet_init_rx_queues(sc);
3362 if (error)
3363 return (error);
3364
3365 error = vtnet_init_tx_queues(sc);
3366 if (error)
3367 return (error);
3368
3369 return (0);
3370 }
3371
3372 static void
vtnet_set_active_vq_pairs(struct vtnet_softc * sc)3373 vtnet_set_active_vq_pairs(struct vtnet_softc *sc)
3374 {
3375 device_t dev;
3376 int npairs;
3377
3378 dev = sc->vtnet_dev;
3379
3380 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) {
3381 sc->vtnet_act_vq_pairs = 1;
3382 return;
3383 }
3384
3385 npairs = sc->vtnet_req_vq_pairs;
3386
3387 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) {
3388 device_printf(dev, "cannot set active queue pairs to %d, "
3389 "falling back to 1 queue pair\n", npairs);
3390 npairs = 1;
3391 }
3392
3393 sc->vtnet_act_vq_pairs = npairs;
3394 }
3395
3396 static void
vtnet_update_rx_offloads(struct vtnet_softc * sc)3397 vtnet_update_rx_offloads(struct vtnet_softc *sc)
3398 {
3399 if_t ifp;
3400 uint64_t features;
3401 int error;
3402
3403 ifp = sc->vtnet_ifp;
3404 features = sc->vtnet_features;
3405
3406 VTNET_CORE_LOCK_ASSERT(sc);
3407
3408 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
3409 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6))
3410 features |= VIRTIO_NET_F_GUEST_CSUM;
3411 else
3412 features &= ~VIRTIO_NET_F_GUEST_CSUM;
3413 }
3414
3415 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) {
3416 if (if_getcapenable(ifp) & IFCAP_LRO)
3417 features |= VTNET_LRO_FEATURES;
3418 else
3419 features &= ~VTNET_LRO_FEATURES;
3420 }
3421
3422 error = vtnet_ctrl_guest_offloads(sc,
3423 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 |
3424 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN |
3425 VIRTIO_NET_F_GUEST_UFO));
3426 if (error) {
3427 device_printf(sc->vtnet_dev,
3428 "%s: cannot update Rx features\n", __func__);
3429 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
3430 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3431 vtnet_init_locked(sc, 0);
3432 }
3433 } else
3434 sc->vtnet_features = features;
3435 }
3436
3437 static int
vtnet_reinit(struct vtnet_softc * sc)3438 vtnet_reinit(struct vtnet_softc *sc)
3439 {
3440 if_t ifp;
3441 int error;
3442
3443 ifp = sc->vtnet_ifp;
3444
3445 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN);
3446
3447 error = vtnet_virtio_reinit(sc);
3448 if (error)
3449 return (error);
3450
3451 vtnet_set_macaddr(sc);
3452 vtnet_set_active_vq_pairs(sc);
3453
3454 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
3455 vtnet_init_rx_filters(sc);
3456
3457 if_sethwassist(ifp, 0);
3458 if (if_getcapenable(ifp) & IFCAP_TXCSUM)
3459 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0);
3460 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6)
3461 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0);
3462 if (if_getcapenable(ifp) & IFCAP_TSO4)
3463 if_sethwassistbits(ifp, CSUM_IP_TSO, 0);
3464 if (if_getcapenable(ifp) & IFCAP_TSO6)
3465 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0);
3466
3467 error = vtnet_init_rxtx_queues(sc);
3468 if (error)
3469 return (error);
3470
3471 return (0);
3472 }
3473
3474 static void
vtnet_init_locked(struct vtnet_softc * sc,int init_mode)3475 vtnet_init_locked(struct vtnet_softc *sc, int init_mode)
3476 {
3477 if_t ifp;
3478
3479 ifp = sc->vtnet_ifp;
3480
3481 VTNET_CORE_LOCK_ASSERT(sc);
3482
3483 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
3484 return;
3485
3486 vtnet_stop(sc);
3487
3488 #ifdef DEV_NETMAP
3489 /* Once stopped we can update the netmap flags, if necessary. */
3490 switch (init_mode) {
3491 case VTNET_INIT_NETMAP_ENTER:
3492 nm_set_native_flags(NA(ifp));
3493 break;
3494 case VTNET_INIT_NETMAP_EXIT:
3495 nm_clear_native_flags(NA(ifp));
3496 break;
3497 }
3498 #endif /* DEV_NETMAP */
3499
3500 if (vtnet_reinit(sc) != 0) {
3501 vtnet_stop(sc);
3502 return;
3503 }
3504
3505 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0);
3506 vtnet_update_link_status(sc);
3507 vtnet_enable_interrupts(sc);
3508 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
3509
3510 #ifdef DEV_NETMAP
3511 /* Re-enable txsync/rxsync. */
3512 netmap_enable_all_rings(ifp);
3513 #endif /* DEV_NETMAP */
3514 }
3515
3516 static void
vtnet_init(void * xsc)3517 vtnet_init(void *xsc)
3518 {
3519 struct vtnet_softc *sc;
3520
3521 sc = xsc;
3522
3523 VTNET_CORE_LOCK(sc);
3524 vtnet_init_locked(sc, 0);
3525 VTNET_CORE_UNLOCK(sc);
3526 }
3527
3528 static void
vtnet_free_ctrl_vq(struct vtnet_softc * sc)3529 vtnet_free_ctrl_vq(struct vtnet_softc *sc)
3530 {
3531
3532 /*
3533 * The control virtqueue is only polled and therefore it should
3534 * already be empty.
3535 */
3536 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq),
3537 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq));
3538 }
3539
3540 static void
vtnet_exec_ctrl_cmd(struct vtnet_softc * sc,void * cookie,struct sglist * sg,int readable,int writable)3541 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie,
3542 struct sglist *sg, int readable, int writable)
3543 {
3544 struct virtqueue *vq;
3545
3546 vq = sc->vtnet_ctrl_vq;
3547
3548 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ);
3549 VTNET_CORE_LOCK_ASSERT(sc);
3550
3551 if (!virtqueue_empty(vq))
3552 return;
3553
3554 /*
3555 * Poll for the response, but the command is likely completed before
3556 * returning from the notify.
3557 */
3558 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) {
3559 virtqueue_notify(vq);
3560 virtqueue_poll(vq, NULL);
3561 }
3562 }
3563
3564 static int
vtnet_ctrl_mac_cmd(struct vtnet_softc * sc,uint8_t * hwaddr)3565 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr)
3566 {
3567 struct sglist_seg segs[3];
3568 struct sglist sg;
3569 struct {
3570 struct virtio_net_ctrl_hdr hdr __aligned(2);
3571 uint8_t pad1;
3572 uint8_t addr[ETHER_ADDR_LEN] __aligned(8);
3573 uint8_t pad2;
3574 uint8_t ack;
3575 } s;
3576 int error;
3577
3578 error = 0;
3579 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC);
3580
3581 s.hdr.class = VIRTIO_NET_CTRL_MAC;
3582 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
3583 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN);
3584 s.ack = VIRTIO_NET_ERR;
3585
3586 sglist_init(&sg, nitems(segs), segs);
3587 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3588 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN);
3589 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3590 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3591
3592 if (error == 0)
3593 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3594
3595 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3596 }
3597
3598 static int
vtnet_ctrl_guest_offloads(struct vtnet_softc * sc,uint64_t offloads)3599 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads)
3600 {
3601 struct sglist_seg segs[3];
3602 struct sglist sg;
3603 struct {
3604 struct virtio_net_ctrl_hdr hdr __aligned(2);
3605 uint8_t pad1;
3606 uint64_t offloads __aligned(8);
3607 uint8_t pad2;
3608 uint8_t ack;
3609 } s;
3610 int error;
3611
3612 error = 0;
3613 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
3614
3615 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS;
3616 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET;
3617 s.offloads = vtnet_gtoh64(sc, offloads);
3618 s.ack = VIRTIO_NET_ERR;
3619
3620 sglist_init(&sg, nitems(segs), segs);
3621 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3622 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t));
3623 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3624 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3625
3626 if (error == 0)
3627 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3628
3629 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3630 }
3631
3632 static int
vtnet_ctrl_mq_cmd(struct vtnet_softc * sc,uint16_t npairs)3633 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs)
3634 {
3635 struct sglist_seg segs[3];
3636 struct sglist sg;
3637 struct {
3638 struct virtio_net_ctrl_hdr hdr __aligned(2);
3639 uint8_t pad1;
3640 struct virtio_net_ctrl_mq mq __aligned(2);
3641 uint8_t pad2;
3642 uint8_t ack;
3643 } s;
3644 int error;
3645
3646 error = 0;
3647 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ);
3648
3649 s.hdr.class = VIRTIO_NET_CTRL_MQ;
3650 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
3651 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs);
3652 s.ack = VIRTIO_NET_ERR;
3653
3654 sglist_init(&sg, nitems(segs), segs);
3655 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3656 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq));
3657 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3658 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3659
3660 if (error == 0)
3661 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3662
3663 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3664 }
3665
3666 static int
vtnet_ctrl_rx_cmd(struct vtnet_softc * sc,uint8_t cmd,bool on)3667 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on)
3668 {
3669 struct sglist_seg segs[3];
3670 struct sglist sg;
3671 struct {
3672 struct virtio_net_ctrl_hdr hdr __aligned(2);
3673 uint8_t pad1;
3674 uint8_t onoff;
3675 uint8_t pad2;
3676 uint8_t ack;
3677 } s;
3678 int error;
3679
3680 error = 0;
3681 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3682
3683 s.hdr.class = VIRTIO_NET_CTRL_RX;
3684 s.hdr.cmd = cmd;
3685 s.onoff = on;
3686 s.ack = VIRTIO_NET_ERR;
3687
3688 sglist_init(&sg, nitems(segs), segs);
3689 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3690 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t));
3691 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3692 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3693
3694 if (error == 0)
3695 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3696
3697 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3698 }
3699
3700 static int
vtnet_set_promisc(struct vtnet_softc * sc,bool on)3701 vtnet_set_promisc(struct vtnet_softc *sc, bool on)
3702 {
3703 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on));
3704 }
3705
3706 static int
vtnet_set_allmulti(struct vtnet_softc * sc,bool on)3707 vtnet_set_allmulti(struct vtnet_softc *sc, bool on)
3708 {
3709 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on));
3710 }
3711
3712 static void
vtnet_rx_filter(struct vtnet_softc * sc)3713 vtnet_rx_filter(struct vtnet_softc *sc)
3714 {
3715 device_t dev;
3716 if_t ifp;
3717
3718 dev = sc->vtnet_dev;
3719 ifp = sc->vtnet_ifp;
3720
3721 VTNET_CORE_LOCK_ASSERT(sc);
3722
3723 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) {
3724 device_printf(dev, "cannot %s promiscuous mode\n",
3725 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable");
3726 }
3727
3728 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) {
3729 device_printf(dev, "cannot %s all-multicast mode\n",
3730 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable");
3731 }
3732 }
3733
3734 static u_int
vtnet_copy_ifaddr(void * arg,struct sockaddr_dl * sdl,u_int ucnt)3735 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt)
3736 {
3737 struct vtnet_softc *sc = arg;
3738
3739 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0)
3740 return (0);
3741
3742 if (ucnt < VTNET_MAX_MAC_ENTRIES)
3743 bcopy(LLADDR(sdl),
3744 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt],
3745 ETHER_ADDR_LEN);
3746
3747 return (1);
3748 }
3749
3750 static u_int
vtnet_copy_maddr(void * arg,struct sockaddr_dl * sdl,u_int mcnt)3751 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt)
3752 {
3753 struct vtnet_mac_filter *filter = arg;
3754
3755 if (mcnt < VTNET_MAX_MAC_ENTRIES)
3756 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt],
3757 ETHER_ADDR_LEN);
3758
3759 return (1);
3760 }
3761
3762 static void
vtnet_rx_filter_mac(struct vtnet_softc * sc)3763 vtnet_rx_filter_mac(struct vtnet_softc *sc)
3764 {
3765 struct virtio_net_ctrl_hdr hdr __aligned(2);
3766 struct vtnet_mac_filter *filter;
3767 struct sglist_seg segs[4];
3768 struct sglist sg;
3769 if_t ifp;
3770 bool promisc, allmulti;
3771 u_int ucnt, mcnt;
3772 int error;
3773 uint8_t ack;
3774
3775 ifp = sc->vtnet_ifp;
3776 filter = sc->vtnet_mac_filter;
3777 error = 0;
3778
3779 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3780 VTNET_CORE_LOCK_ASSERT(sc);
3781
3782 /* Unicast MAC addresses: */
3783 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc);
3784 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES);
3785
3786 if (promisc) {
3787 ucnt = 0;
3788 if_printf(ifp, "more than %d MAC addresses assigned, "
3789 "falling back to promiscuous mode\n",
3790 VTNET_MAX_MAC_ENTRIES);
3791 }
3792
3793 /* Multicast MAC addresses: */
3794 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter);
3795 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES);
3796
3797 if (allmulti) {
3798 mcnt = 0;
3799 if_printf(ifp, "more than %d multicast MAC addresses "
3800 "assigned, falling back to all-multicast mode\n",
3801 VTNET_MAX_MAC_ENTRIES);
3802 }
3803
3804 if (promisc && allmulti)
3805 goto out;
3806
3807 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt);
3808 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt);
3809
3810 hdr.class = VIRTIO_NET_CTRL_MAC;
3811 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
3812 ack = VIRTIO_NET_ERR;
3813
3814 sglist_init(&sg, nitems(segs), segs);
3815 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr));
3816 error |= sglist_append(&sg, &filter->vmf_unicast,
3817 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN);
3818 error |= sglist_append(&sg, &filter->vmf_multicast,
3819 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN);
3820 error |= sglist_append(&sg, &ack, sizeof(uint8_t));
3821 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3822
3823 if (error == 0)
3824 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1);
3825 if (ack != VIRTIO_NET_OK)
3826 if_printf(ifp, "error setting host MAC filter table\n");
3827
3828 out:
3829 if (promisc && vtnet_set_promisc(sc, true) != 0)
3830 if_printf(ifp, "cannot enable promiscuous mode\n");
3831 if (allmulti && vtnet_set_allmulti(sc, true) != 0)
3832 if_printf(ifp, "cannot enable all-multicast mode\n");
3833 }
3834
3835 static int
vtnet_exec_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3836 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3837 {
3838 struct sglist_seg segs[3];
3839 struct sglist sg;
3840 struct {
3841 struct virtio_net_ctrl_hdr hdr __aligned(2);
3842 uint8_t pad1;
3843 uint16_t tag __aligned(2);
3844 uint8_t pad2;
3845 uint8_t ack;
3846 } s;
3847 int error;
3848
3849 error = 0;
3850 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3851
3852 s.hdr.class = VIRTIO_NET_CTRL_VLAN;
3853 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
3854 s.tag = vtnet_gtoh16(sc, tag);
3855 s.ack = VIRTIO_NET_ERR;
3856
3857 sglist_init(&sg, nitems(segs), segs);
3858 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3859 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t));
3860 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3861 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3862
3863 if (error == 0)
3864 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3865
3866 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3867 }
3868
3869 static void
vtnet_rx_filter_vlan(struct vtnet_softc * sc)3870 vtnet_rx_filter_vlan(struct vtnet_softc *sc)
3871 {
3872 int i, bit;
3873 uint32_t w;
3874 uint16_t tag;
3875
3876 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3877 VTNET_CORE_LOCK_ASSERT(sc);
3878
3879 /* Enable the filter for each configured VLAN. */
3880 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) {
3881 w = sc->vtnet_vlan_filter[i];
3882
3883 while ((bit = ffs(w) - 1) != -1) {
3884 w &= ~(1 << bit);
3885 tag = sizeof(w) * CHAR_BIT * i + bit;
3886
3887 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) {
3888 device_printf(sc->vtnet_dev,
3889 "cannot enable VLAN %d filter\n", tag);
3890 }
3891 }
3892 }
3893 }
3894
3895 static void
vtnet_update_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3896 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3897 {
3898 if_t ifp;
3899 int idx, bit;
3900
3901 ifp = sc->vtnet_ifp;
3902 idx = (tag >> 5) & 0x7F;
3903 bit = tag & 0x1F;
3904
3905 if (tag == 0 || tag > 4095)
3906 return;
3907
3908 VTNET_CORE_LOCK(sc);
3909
3910 if (add)
3911 sc->vtnet_vlan_filter[idx] |= (1 << bit);
3912 else
3913 sc->vtnet_vlan_filter[idx] &= ~(1 << bit);
3914
3915 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER &&
3916 if_getdrvflags(ifp) & IFF_DRV_RUNNING &&
3917 vtnet_exec_vlan_filter(sc, add, tag) != 0) {
3918 device_printf(sc->vtnet_dev,
3919 "cannot %s VLAN %d %s the host filter table\n",
3920 add ? "add" : "remove", tag, add ? "to" : "from");
3921 }
3922
3923 VTNET_CORE_UNLOCK(sc);
3924 }
3925
3926 static void
vtnet_register_vlan(void * arg,if_t ifp,uint16_t tag)3927 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag)
3928 {
3929
3930 if (if_getsoftc(ifp) != arg)
3931 return;
3932
3933 vtnet_update_vlan_filter(arg, 1, tag);
3934 }
3935
3936 static void
vtnet_unregister_vlan(void * arg,if_t ifp,uint16_t tag)3937 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag)
3938 {
3939
3940 if (if_getsoftc(ifp) != arg)
3941 return;
3942
3943 vtnet_update_vlan_filter(arg, 0, tag);
3944 }
3945
3946 static void
vtnet_update_speed_duplex(struct vtnet_softc * sc)3947 vtnet_update_speed_duplex(struct vtnet_softc *sc)
3948 {
3949 if_t ifp;
3950 uint32_t speed;
3951
3952 ifp = sc->vtnet_ifp;
3953
3954 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0)
3955 return;
3956
3957 /* BMV: Ignore duplex. */
3958 speed = virtio_read_dev_config_4(sc->vtnet_dev,
3959 offsetof(struct virtio_net_config, speed));
3960 if (speed != UINT32_MAX)
3961 if_setbaudrate(ifp, IF_Mbps(speed));
3962 }
3963
3964 static int
vtnet_is_link_up(struct vtnet_softc * sc)3965 vtnet_is_link_up(struct vtnet_softc *sc)
3966 {
3967 uint16_t status;
3968
3969 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0)
3970 return (1);
3971
3972 status = virtio_read_dev_config_2(sc->vtnet_dev,
3973 offsetof(struct virtio_net_config, status));
3974
3975 return ((status & VIRTIO_NET_S_LINK_UP) != 0);
3976 }
3977
3978 static void
vtnet_update_link_status(struct vtnet_softc * sc)3979 vtnet_update_link_status(struct vtnet_softc *sc)
3980 {
3981 if_t ifp;
3982 int link;
3983
3984 ifp = sc->vtnet_ifp;
3985 VTNET_CORE_LOCK_ASSERT(sc);
3986 link = vtnet_is_link_up(sc);
3987
3988 /* Notify if the link status has changed. */
3989 if (link != 0 && sc->vtnet_link_active == 0) {
3990 vtnet_update_speed_duplex(sc);
3991 sc->vtnet_link_active = 1;
3992 if_link_state_change(ifp, LINK_STATE_UP);
3993 } else if (link == 0 && sc->vtnet_link_active != 0) {
3994 sc->vtnet_link_active = 0;
3995 if_link_state_change(ifp, LINK_STATE_DOWN);
3996 }
3997 }
3998
3999 static int
vtnet_ifmedia_upd(if_t ifp __unused)4000 vtnet_ifmedia_upd(if_t ifp __unused)
4001 {
4002 return (EOPNOTSUPP);
4003 }
4004
4005 static void
vtnet_ifmedia_sts(if_t ifp,struct ifmediareq * ifmr)4006 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr)
4007 {
4008 struct vtnet_softc *sc;
4009
4010 sc = if_getsoftc(ifp);
4011
4012 ifmr->ifm_status = IFM_AVALID;
4013 ifmr->ifm_active = IFM_ETHER;
4014
4015 VTNET_CORE_LOCK(sc);
4016 if (vtnet_is_link_up(sc) != 0) {
4017 ifmr->ifm_status |= IFM_ACTIVE;
4018 ifmr->ifm_active |= IFM_10G_T | IFM_FDX;
4019 } else
4020 ifmr->ifm_active |= IFM_NONE;
4021 VTNET_CORE_UNLOCK(sc);
4022 }
4023
4024 static void
vtnet_get_macaddr(struct vtnet_softc * sc)4025 vtnet_get_macaddr(struct vtnet_softc *sc)
4026 {
4027
4028 if (sc->vtnet_flags & VTNET_FLAG_MAC) {
4029 virtio_read_device_config_array(sc->vtnet_dev,
4030 offsetof(struct virtio_net_config, mac),
4031 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN);
4032 } else {
4033 /* Generate a random locally administered unicast address. */
4034 sc->vtnet_hwaddr[0] = 0xB2;
4035 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0);
4036 }
4037 }
4038
4039 static void
vtnet_set_macaddr(struct vtnet_softc * sc)4040 vtnet_set_macaddr(struct vtnet_softc *sc)
4041 {
4042 device_t dev;
4043 int error;
4044
4045 dev = sc->vtnet_dev;
4046
4047 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) {
4048 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr);
4049 if (error)
4050 device_printf(dev, "unable to set MAC address\n");
4051 return;
4052 }
4053
4054 /* MAC in config is read-only in modern VirtIO. */
4055 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) {
4056 for (int i = 0; i < ETHER_ADDR_LEN; i++) {
4057 virtio_write_dev_config_1(dev,
4058 offsetof(struct virtio_net_config, mac) + i,
4059 sc->vtnet_hwaddr[i]);
4060 }
4061 }
4062 }
4063
4064 static void
vtnet_attached_set_macaddr(struct vtnet_softc * sc)4065 vtnet_attached_set_macaddr(struct vtnet_softc *sc)
4066 {
4067
4068 /* Assign MAC address if it was generated. */
4069 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0)
4070 vtnet_set_macaddr(sc);
4071 }
4072
4073 static void
vtnet_vlan_tag_remove(struct mbuf * m)4074 vtnet_vlan_tag_remove(struct mbuf *m)
4075 {
4076 struct ether_vlan_header *evh;
4077
4078 evh = mtod(m, struct ether_vlan_header *);
4079 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag);
4080 m->m_flags |= M_VLANTAG;
4081
4082 /* Strip the 802.1Q header. */
4083 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN,
4084 ETHER_HDR_LEN - ETHER_TYPE_LEN);
4085 m_adj(m, ETHER_VLAN_ENCAP_LEN);
4086 }
4087
4088 static void
vtnet_set_rx_process_limit(struct vtnet_softc * sc)4089 vtnet_set_rx_process_limit(struct vtnet_softc *sc)
4090 {
4091 int limit;
4092
4093 limit = vtnet_tunable_int(sc, "rx_process_limit",
4094 vtnet_rx_process_limit);
4095 if (limit < 0)
4096 limit = INT_MAX;
4097 sc->vtnet_rx_process_limit = limit;
4098 }
4099
4100 static void
vtnet_setup_rxq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_rxq * rxq)4101 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx,
4102 struct sysctl_oid_list *child, struct vtnet_rxq *rxq)
4103 {
4104 struct sysctl_oid *node;
4105 struct sysctl_oid_list *list;
4106 struct vtnet_rxq_stats *stats;
4107 char namebuf[16];
4108
4109 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id);
4110 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4111 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue");
4112 list = SYSCTL_CHILDREN(node);
4113
4114 stats = &rxq->vtnrx_stats;
4115
4116 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets",
4117 CTLFLAG_RD | CTLFLAG_STATS,
4118 &stats->vrxs_ipackets, "Receive packets");
4119 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes",
4120 CTLFLAG_RD | CTLFLAG_STATS,
4121 &stats->vrxs_ibytes, "Receive bytes");
4122 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops",
4123 CTLFLAG_RD | CTLFLAG_STATS,
4124 &stats->vrxs_iqdrops, "Receive drops");
4125 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors",
4126 CTLFLAG_RD | CTLFLAG_STATS,
4127 &stats->vrxs_ierrors, "Receive errors");
4128 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum",
4129 CTLFLAG_RD | CTLFLAG_STATS,
4130 &stats->vrxs_csum, "Receive checksum offloaded");
4131 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed",
4132 CTLFLAG_RD | CTLFLAG_STATS,
4133 &stats->vrxs_csum_failed, "Receive checksum offload failed");
4134 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro",
4135 CTLFLAG_RD | CTLFLAG_STATS,
4136 &stats->vrxs_host_lro, "Receive host segmentation offloaded");
4137 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled",
4138 CTLFLAG_RD | CTLFLAG_STATS,
4139 &stats->vrxs_rescheduled,
4140 "Receive interrupt handler rescheduled");
4141 }
4142
4143 static void
vtnet_setup_txq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_txq * txq)4144 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx,
4145 struct sysctl_oid_list *child, struct vtnet_txq *txq)
4146 {
4147 struct sysctl_oid *node;
4148 struct sysctl_oid_list *list;
4149 struct vtnet_txq_stats *stats;
4150 char namebuf[16];
4151
4152 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id);
4153 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4154 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue");
4155 list = SYSCTL_CHILDREN(node);
4156
4157 stats = &txq->vtntx_stats;
4158
4159 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets",
4160 CTLFLAG_RD | CTLFLAG_STATS,
4161 &stats->vtxs_opackets, "Transmit packets");
4162 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes",
4163 CTLFLAG_RD | CTLFLAG_STATS,
4164 &stats->vtxs_obytes, "Transmit bytes");
4165 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts",
4166 CTLFLAG_RD | CTLFLAG_STATS,
4167 &stats->vtxs_omcasts, "Transmit multicasts");
4168 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum",
4169 CTLFLAG_RD | CTLFLAG_STATS,
4170 &stats->vtxs_csum, "Transmit checksum offloaded");
4171 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso",
4172 CTLFLAG_RD | CTLFLAG_STATS,
4173 &stats->vtxs_tso, "Transmit TCP segmentation offloaded");
4174 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled",
4175 CTLFLAG_RD | CTLFLAG_STATS,
4176 &stats->vtxs_rescheduled,
4177 "Transmit interrupt handler rescheduled");
4178 }
4179
4180 static void
vtnet_setup_queue_sysctl(struct vtnet_softc * sc)4181 vtnet_setup_queue_sysctl(struct vtnet_softc *sc)
4182 {
4183 device_t dev;
4184 struct sysctl_ctx_list *ctx;
4185 struct sysctl_oid *tree;
4186 struct sysctl_oid_list *child;
4187 int i;
4188
4189 dev = sc->vtnet_dev;
4190 ctx = device_get_sysctl_ctx(dev);
4191 tree = device_get_sysctl_tree(dev);
4192 child = SYSCTL_CHILDREN(tree);
4193
4194 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
4195 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]);
4196 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]);
4197 }
4198 }
4199
4200 static int
vtnet_sysctl_rx_csum_failed(SYSCTL_HANDLER_ARGS)4201 vtnet_sysctl_rx_csum_failed(SYSCTL_HANDLER_ARGS)
4202 {
4203 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4204 struct vtnet_statistics *stats = &sc->vtnet_stats;
4205 struct vtnet_rxq_stats *rxst;
4206 int i;
4207
4208 stats->rx_csum_failed = 0;
4209 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4210 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
4211 stats->rx_csum_failed += rxst->vrxs_csum_failed;
4212 }
4213 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_failed, req));
4214 }
4215
4216 static int
vtnet_sysctl_rx_csum_offloaded(SYSCTL_HANDLER_ARGS)4217 vtnet_sysctl_rx_csum_offloaded(SYSCTL_HANDLER_ARGS)
4218 {
4219 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4220 struct vtnet_statistics *stats = &sc->vtnet_stats;
4221 struct vtnet_rxq_stats *rxst;
4222 int i;
4223
4224 stats->rx_csum_offloaded = 0;
4225 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4226 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
4227 stats->rx_csum_offloaded += rxst->vrxs_csum;
4228 }
4229 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_offloaded, req));
4230 }
4231
4232 static int
vtnet_sysctl_rx_task_rescheduled(SYSCTL_HANDLER_ARGS)4233 vtnet_sysctl_rx_task_rescheduled(SYSCTL_HANDLER_ARGS)
4234 {
4235 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4236 struct vtnet_statistics *stats = &sc->vtnet_stats;
4237 struct vtnet_rxq_stats *rxst;
4238 int i;
4239
4240 stats->rx_task_rescheduled = 0;
4241 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4242 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
4243 stats->rx_task_rescheduled += rxst->vrxs_rescheduled;
4244 }
4245 return (sysctl_handle_64(oidp, NULL, stats->rx_task_rescheduled, req));
4246 }
4247
4248 static int
vtnet_sysctl_tx_csum_offloaded(SYSCTL_HANDLER_ARGS)4249 vtnet_sysctl_tx_csum_offloaded(SYSCTL_HANDLER_ARGS)
4250 {
4251 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4252 struct vtnet_statistics *stats = &sc->vtnet_stats;
4253 struct vtnet_txq_stats *txst;
4254 int i;
4255
4256 stats->tx_csum_offloaded = 0;
4257 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4258 txst = &sc->vtnet_txqs[i].vtntx_stats;
4259 stats->tx_csum_offloaded += txst->vtxs_csum;
4260 }
4261 return (sysctl_handle_64(oidp, NULL, stats->tx_csum_offloaded, req));
4262 }
4263
4264 static int
vtnet_sysctl_tx_tso_offloaded(SYSCTL_HANDLER_ARGS)4265 vtnet_sysctl_tx_tso_offloaded(SYSCTL_HANDLER_ARGS)
4266 {
4267 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4268 struct vtnet_statistics *stats = &sc->vtnet_stats;
4269 struct vtnet_txq_stats *txst;
4270 int i;
4271
4272 stats->tx_tso_offloaded = 0;
4273 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4274 txst = &sc->vtnet_txqs[i].vtntx_stats;
4275 stats->tx_tso_offloaded += txst->vtxs_tso;
4276 }
4277 return (sysctl_handle_64(oidp, NULL, stats->tx_tso_offloaded, req));
4278 }
4279
4280 static int
vtnet_sysctl_tx_task_rescheduled(SYSCTL_HANDLER_ARGS)4281 vtnet_sysctl_tx_task_rescheduled(SYSCTL_HANDLER_ARGS)
4282 {
4283 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4284 struct vtnet_statistics *stats = &sc->vtnet_stats;
4285 struct vtnet_txq_stats *txst;
4286 int i;
4287
4288 stats->tx_task_rescheduled = 0;
4289 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4290 txst = &sc->vtnet_txqs[i].vtntx_stats;
4291 stats->tx_task_rescheduled += txst->vtxs_rescheduled;
4292 }
4293 return (sysctl_handle_64(oidp, NULL, stats->tx_task_rescheduled, req));
4294 }
4295
4296 static void
vtnet_setup_stat_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_softc * sc)4297 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx,
4298 struct sysctl_oid_list *child, struct vtnet_softc *sc)
4299 {
4300 struct vtnet_statistics *stats;
4301 struct vtnet_rxq_stats rxaccum;
4302 struct vtnet_txq_stats txaccum;
4303
4304 vtnet_accum_stats(sc, &rxaccum, &txaccum);
4305
4306 stats = &sc->vtnet_stats;
4307 stats->rx_csum_offloaded = rxaccum.vrxs_csum;
4308 stats->rx_csum_failed = rxaccum.vrxs_csum_failed;
4309 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled;
4310 stats->tx_csum_offloaded = txaccum.vtxs_csum;
4311 stats->tx_tso_offloaded = txaccum.vtxs_tso;
4312 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled;
4313
4314 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed",
4315 CTLFLAG_RD | CTLFLAG_STATS, &stats->mbuf_alloc_failed,
4316 "Mbuf cluster allocation failures");
4317
4318 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large",
4319 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_frame_too_large,
4320 "Received frame larger than the mbuf chain");
4321 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed",
4322 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_enq_replacement_failed,
4323 "Enqueuing the replacement receive mbuf failed");
4324 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed",
4325 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_mergeable_failed,
4326 "Mergeable buffers receive failures");
4327 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype",
4328 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ethtype,
4329 "Received checksum offloaded buffer with unsupported "
4330 "Ethernet type");
4331 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto",
4332 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ipproto,
4333 "Received checksum offloaded buffer with incorrect IP protocol");
4334 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset",
4335 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_offset,
4336 "Received checksum offloaded buffer with incorrect offset");
4337 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_inaccessible_ipproto",
4338 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_inaccessible_ipproto,
4339 "Received checksum offloaded buffer with inaccessible IP protocol");
4340 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_failed",
4341 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4342 sc, 0, vtnet_sysctl_rx_csum_failed, "QU",
4343 "Received buffer checksum offload failed");
4344 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_offloaded",
4345 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4346 sc, 0, vtnet_sysctl_rx_csum_offloaded, "QU",
4347 "Received buffer checksum offload succeeded");
4348 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_task_rescheduled",
4349 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4350 sc, 0, vtnet_sysctl_rx_task_rescheduled, "QU",
4351 "Times the receive interrupt task rescheduled itself");
4352
4353 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype",
4354 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_unknown_ethtype,
4355 "Aborted transmit of checksum offloaded buffer with unknown "
4356 "Ethernet type");
4357 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch",
4358 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_proto_mismatch,
4359 "Aborted transmit of checksum offloaded buffer because mismatched "
4360 "protocols");
4361 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp",
4362 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_not_tcp,
4363 "Aborted transmit of TSO buffer with non TCP protocol");
4364 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum",
4365 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_without_csum,
4366 "Aborted transmit of TSO buffer without TCP checksum offload");
4367 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged",
4368 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defragged,
4369 "Transmit mbufs defragged");
4370 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed",
4371 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defrag_failed,
4372 "Aborted transmit of buffer because defrag failed");
4373 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_csum_offloaded",
4374 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4375 sc, 0, vtnet_sysctl_tx_csum_offloaded, "QU",
4376 "Offloaded checksum of transmitted buffer");
4377 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_tso_offloaded",
4378 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4379 sc, 0, vtnet_sysctl_tx_tso_offloaded, "QU",
4380 "Segmentation offload of transmitted buffer");
4381 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_task_rescheduled",
4382 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4383 sc, 0, vtnet_sysctl_tx_task_rescheduled, "QU",
4384 "Times the transmit interrupt task rescheduled itself");
4385 }
4386
4387 static void
vtnet_setup_sysctl(struct vtnet_softc * sc)4388 vtnet_setup_sysctl(struct vtnet_softc *sc)
4389 {
4390 device_t dev;
4391 struct sysctl_ctx_list *ctx;
4392 struct sysctl_oid *tree;
4393 struct sysctl_oid_list *child;
4394
4395 dev = sc->vtnet_dev;
4396 ctx = device_get_sysctl_ctx(dev);
4397 tree = device_get_sysctl_tree(dev);
4398 child = SYSCTL_CHILDREN(tree);
4399
4400 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs",
4401 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0,
4402 "Number of maximum supported virtqueue pairs");
4403 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs",
4404 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0,
4405 "Number of requested virtqueue pairs");
4406 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
4407 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,
4408 "Number of active virtqueue pairs");
4409
4410 vtnet_setup_stat_sysctl(ctx, child, sc);
4411 }
4412
4413 static void
vtnet_load_tunables(struct vtnet_softc * sc)4414 vtnet_load_tunables(struct vtnet_softc *sc)
4415 {
4416
4417 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc,
4418 "lro_entry_count", vtnet_lro_entry_count);
4419 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES)
4420 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES;
4421
4422 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc,
4423 "lro_mbufq_depth", vtnet_lro_mbufq_depth);
4424 }
4425
4426 static int
vtnet_rxq_enable_intr(struct vtnet_rxq * rxq)4427 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq)
4428 {
4429
4430 return (virtqueue_enable_intr(rxq->vtnrx_vq));
4431 }
4432
4433 static void
vtnet_rxq_disable_intr(struct vtnet_rxq * rxq)4434 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq)
4435 {
4436
4437 virtqueue_disable_intr(rxq->vtnrx_vq);
4438 }
4439
4440 static int
vtnet_txq_enable_intr(struct vtnet_txq * txq)4441 vtnet_txq_enable_intr(struct vtnet_txq *txq)
4442 {
4443 struct virtqueue *vq;
4444
4445 vq = txq->vtntx_vq;
4446
4447 if (vtnet_txq_below_threshold(txq) != 0)
4448 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG));
4449
4450 /*
4451 * The free count is above our threshold. Keep the Tx interrupt
4452 * disabled until the queue is fuller.
4453 */
4454 return (0);
4455 }
4456
4457 static void
vtnet_txq_disable_intr(struct vtnet_txq * txq)4458 vtnet_txq_disable_intr(struct vtnet_txq *txq)
4459 {
4460
4461 virtqueue_disable_intr(txq->vtntx_vq);
4462 }
4463
4464 static void
vtnet_enable_rx_interrupts(struct vtnet_softc * sc)4465 vtnet_enable_rx_interrupts(struct vtnet_softc *sc)
4466 {
4467 struct vtnet_rxq *rxq;
4468 int i;
4469
4470 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
4471 rxq = &sc->vtnet_rxqs[i];
4472 if (vtnet_rxq_enable_intr(rxq) != 0)
4473 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
4474 }
4475 }
4476
4477 static void
vtnet_enable_tx_interrupts(struct vtnet_softc * sc)4478 vtnet_enable_tx_interrupts(struct vtnet_softc *sc)
4479 {
4480 int i;
4481
4482 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4483 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]);
4484 }
4485
4486 static void
vtnet_enable_interrupts(struct vtnet_softc * sc)4487 vtnet_enable_interrupts(struct vtnet_softc *sc)
4488 {
4489
4490 vtnet_enable_rx_interrupts(sc);
4491 vtnet_enable_tx_interrupts(sc);
4492 }
4493
4494 static void
vtnet_disable_rx_interrupts(struct vtnet_softc * sc)4495 vtnet_disable_rx_interrupts(struct vtnet_softc *sc)
4496 {
4497 int i;
4498
4499 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4500 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]);
4501 }
4502
4503 static void
vtnet_disable_tx_interrupts(struct vtnet_softc * sc)4504 vtnet_disable_tx_interrupts(struct vtnet_softc *sc)
4505 {
4506 int i;
4507
4508 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4509 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]);
4510 }
4511
4512 static void
vtnet_disable_interrupts(struct vtnet_softc * sc)4513 vtnet_disable_interrupts(struct vtnet_softc *sc)
4514 {
4515
4516 vtnet_disable_rx_interrupts(sc);
4517 vtnet_disable_tx_interrupts(sc);
4518 }
4519
4520 static int
vtnet_tunable_int(struct vtnet_softc * sc,const char * knob,int def)4521 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def)
4522 {
4523 char path[64];
4524
4525 snprintf(path, sizeof(path),
4526 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob);
4527 TUNABLE_INT_FETCH(path, &def);
4528
4529 return (def);
4530 }
4531
4532 #ifdef DEBUGNET
4533 static void
vtnet_debugnet_init(if_t ifp,int * nrxr,int * ncl,int * clsize)4534 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize)
4535 {
4536 struct vtnet_softc *sc;
4537
4538 sc = if_getsoftc(ifp);
4539
4540 VTNET_CORE_LOCK(sc);
4541 *nrxr = sc->vtnet_req_vq_pairs;
4542 *ncl = DEBUGNET_MAX_IN_FLIGHT;
4543 *clsize = sc->vtnet_rx_clustersz;
4544 VTNET_CORE_UNLOCK(sc);
4545 }
4546
4547 static void
vtnet_debugnet_event(if_t ifp __unused,enum debugnet_ev event)4548 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event)
4549 {
4550 struct vtnet_softc *sc;
4551 static bool sw_lro_enabled = false;
4552
4553 /*
4554 * Disable software LRO, since it would require entering the network
4555 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll().
4556 */
4557 sc = if_getsoftc(ifp);
4558 switch (event) {
4559 case DEBUGNET_START:
4560 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0;
4561 if (sw_lro_enabled)
4562 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO;
4563 break;
4564 case DEBUGNET_END:
4565 if (sw_lro_enabled)
4566 sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
4567 break;
4568 }
4569 }
4570
4571 static int
vtnet_debugnet_transmit(if_t ifp,struct mbuf * m)4572 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m)
4573 {
4574 struct vtnet_softc *sc;
4575 struct vtnet_txq *txq;
4576 int error;
4577
4578 sc = if_getsoftc(ifp);
4579 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4580 IFF_DRV_RUNNING)
4581 return (EBUSY);
4582
4583 txq = &sc->vtnet_txqs[0];
4584 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE);
4585 if (error == 0)
4586 (void)vtnet_txq_notify(txq);
4587 return (error);
4588 }
4589
4590 static int
vtnet_debugnet_poll(if_t ifp,int count)4591 vtnet_debugnet_poll(if_t ifp, int count)
4592 {
4593 struct vtnet_softc *sc;
4594 int i;
4595
4596 sc = if_getsoftc(ifp);
4597 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4598 IFF_DRV_RUNNING)
4599 return (EBUSY);
4600
4601 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]);
4602 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4603 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]);
4604 return (0);
4605 }
4606 #endif /* DEBUGNET */
4607