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 = 1;
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 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */
1157 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0);
1158 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0);
1159
1160 if (vtnet_tunable_int(sc, "fixup_needs_csum",
1161 vtnet_fixup_needs_csum) != 0)
1162 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM;
1163
1164 /* Support either "hardware" or software LRO. */
1165 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0);
1166 }
1167
1168 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) {
1169 /*
1170 * VirtIO does not support VLAN tagging, but we can fake
1171 * it by inserting and removing the 802.1Q header during
1172 * transmit and receive. We are then able to do checksum
1173 * offloading of VLAN frames.
1174 */
1175 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0);
1176 }
1177
1178 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO)
1179 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0);
1180 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0);
1181 if_setcapabilitiesbit(ifp, IFCAP_HWSTATS, 0);
1182
1183 /*
1184 * Capabilities after here are not enabled by default.
1185 */
1186 if_setcapenable(ifp, if_getcapabilities(ifp));
1187
1188 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
1189 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0);
1190
1191 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
1192 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
1193 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
1194 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
1195 }
1196
1197 ether_ifattach(ifp, sc->vtnet_hwaddr);
1198
1199 /* Tell the upper layer(s) we support long frames. */
1200 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header));
1201
1202 DEBUGNET_SET(ifp, vtnet);
1203
1204 pa.pa_version = PFIL_VERSION;
1205 pa.pa_flags = PFIL_IN;
1206 pa.pa_type = PFIL_TYPE_ETHERNET;
1207 pa.pa_headname = if_name(ifp);
1208 sc->vtnet_pfil = pfil_head_register(&pa);
1209
1210 return (0);
1211 }
1212
1213 static int
vtnet_rx_cluster_size(struct vtnet_softc * sc,int mtu)1214 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu)
1215 {
1216 int framesz;
1217
1218 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
1219 return (MJUMPAGESIZE);
1220 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1221 return (MCLBYTES);
1222
1223 /*
1224 * Try to scale the receive mbuf cluster size from the MTU. We
1225 * could also use the VQ size to influence the selected size,
1226 * but that would only matter for very small queues.
1227 */
1228 if (vtnet_modern(sc)) {
1229 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1));
1230 framesz = sizeof(struct virtio_net_hdr_v1);
1231 } else
1232 framesz = sizeof(struct vtnet_rx_header);
1233 framesz += sizeof(struct ether_vlan_header) + mtu;
1234 /*
1235 * Account for the offsetting we'll do elsewhere so we allocate the
1236 * right size for the mtu.
1237 */
1238 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) {
1239 framesz += VTNET_ETHER_ALIGN;
1240 }
1241
1242 if (framesz <= MCLBYTES)
1243 return (MCLBYTES);
1244 else if (framesz <= MJUMPAGESIZE)
1245 return (MJUMPAGESIZE);
1246 else if (framesz <= MJUM9BYTES)
1247 return (MJUM9BYTES);
1248
1249 /* Sane default; avoid 16KB clusters. */
1250 return (MCLBYTES);
1251 }
1252
1253 static int
vtnet_ioctl_mtu(struct vtnet_softc * sc,u_int mtu)1254 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu)
1255 {
1256 if_t ifp;
1257 int clustersz;
1258
1259 ifp = sc->vtnet_ifp;
1260 VTNET_CORE_LOCK_ASSERT(sc);
1261
1262 if (if_getmtu(ifp) == mtu)
1263 return (0);
1264 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu)
1265 return (EINVAL);
1266
1267 if_setmtu(ifp, mtu);
1268 clustersz = vtnet_rx_cluster_size(sc, mtu);
1269
1270 if (clustersz != sc->vtnet_rx_clustersz &&
1271 if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
1272 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
1273 vtnet_init_locked(sc, 0);
1274 }
1275
1276 return (0);
1277 }
1278
1279 static int
vtnet_ioctl_ifflags(struct vtnet_softc * sc)1280 vtnet_ioctl_ifflags(struct vtnet_softc *sc)
1281 {
1282 if_t ifp;
1283 int drv_running;
1284
1285 ifp = sc->vtnet_ifp;
1286 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0;
1287
1288 VTNET_CORE_LOCK_ASSERT(sc);
1289
1290 if ((if_getflags(ifp) & IFF_UP) == 0) {
1291 if (drv_running)
1292 vtnet_stop(sc);
1293 goto out;
1294 }
1295
1296 if (!drv_running) {
1297 vtnet_init_locked(sc, 0);
1298 goto out;
1299 }
1300
1301 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) &
1302 (IFF_PROMISC | IFF_ALLMULTI)) {
1303 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
1304 vtnet_rx_filter(sc);
1305 else {
1306 /*
1307 * We don't support filtering out multicast, so
1308 * ALLMULTI is always set.
1309 */
1310 if_setflagbits(ifp, IFF_ALLMULTI, 0);
1311 if_setflagbits(ifp, IFF_PROMISC, 0);
1312 }
1313 }
1314
1315 out:
1316 sc->vtnet_if_flags = if_getflags(ifp);
1317 return (0);
1318 }
1319
1320 static int
vtnet_ioctl_multi(struct vtnet_softc * sc)1321 vtnet_ioctl_multi(struct vtnet_softc *sc)
1322 {
1323 if_t ifp;
1324
1325 ifp = sc->vtnet_ifp;
1326
1327 VTNET_CORE_LOCK_ASSERT(sc);
1328
1329 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX &&
1330 if_getdrvflags(ifp) & IFF_DRV_RUNNING)
1331 vtnet_rx_filter_mac(sc);
1332
1333 return (0);
1334 }
1335
1336 static int
vtnet_ioctl_ifcap(struct vtnet_softc * sc,struct ifreq * ifr)1337 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr)
1338 {
1339 if_t ifp;
1340 int mask, reinit, update;
1341
1342 ifp = sc->vtnet_ifp;
1343 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp);
1344 reinit = update = 0;
1345
1346 VTNET_CORE_LOCK_ASSERT(sc);
1347
1348 if (mask & IFCAP_TXCSUM) {
1349 if_togglecapenable(ifp, IFCAP_TXCSUM);
1350 if_togglehwassist(ifp, VTNET_CSUM_OFFLOAD);
1351 }
1352 if (mask & IFCAP_TXCSUM_IPV6) {
1353 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6);
1354 if_togglehwassist(ifp, VTNET_CSUM_OFFLOAD_IPV6);
1355 }
1356 if (mask & IFCAP_TSO4) {
1357 if_togglecapenable(ifp, IFCAP_TSO4);
1358 if_togglehwassist(ifp, IFCAP_TSO4);
1359 }
1360 if (mask & IFCAP_TSO6) {
1361 if_togglecapenable(ifp, IFCAP_TSO6);
1362 if_togglehwassist(ifp, IFCAP_TSO6);
1363 }
1364
1365 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) {
1366 /*
1367 * These Rx features require the negotiated features to
1368 * be updated. Avoid a full reinit if possible.
1369 */
1370 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
1371 update = 1;
1372 else
1373 reinit = 1;
1374
1375 /* BMV: Avoid needless renegotiation for just software LRO. */
1376 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) ==
1377 IFCAP_LRO && vtnet_software_lro(sc))
1378 reinit = update = 0;
1379 /*
1380 * VirtIO does not distinguish between receive checksum offload
1381 * for IPv4 and IPv6 packets, so treat them as a pair.
1382 */
1383 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
1384 if_togglecapenable(ifp, IFCAP_RXCSUM);
1385 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6);
1386 }
1387 if (mask & IFCAP_LRO)
1388 if_togglecapenable(ifp, IFCAP_LRO);
1389 /* Both SW and HW TCP LRO require receive checksum offload. */
1390 if ((if_getcapenable(ifp) &
1391 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0)
1392 if_setcapenablebit(ifp, 0, IFCAP_LRO);
1393 }
1394
1395 if (mask & IFCAP_VLAN_HWFILTER) {
1396 /* These Rx features require renegotiation. */
1397 reinit = 1;
1398
1399 if (mask & IFCAP_VLAN_HWFILTER)
1400 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER);
1401 }
1402
1403 if (mask & IFCAP_VLAN_HWTSO)
1404 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO);
1405 if (mask & IFCAP_VLAN_HWTAGGING)
1406 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING);
1407
1408 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
1409 if (reinit) {
1410 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
1411 vtnet_init_locked(sc, 0);
1412 } else if (update)
1413 vtnet_update_rx_offloads(sc);
1414 }
1415
1416 return (0);
1417 }
1418
1419 static int
vtnet_ioctl(if_t ifp,u_long cmd,caddr_t data)1420 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data)
1421 {
1422 struct vtnet_softc *sc;
1423 struct ifreq *ifr;
1424 int error;
1425
1426 sc = if_getsoftc(ifp);
1427 ifr = (struct ifreq *) data;
1428 error = 0;
1429
1430 switch (cmd) {
1431 case SIOCSIFMTU:
1432 VTNET_CORE_LOCK(sc);
1433 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu);
1434 VTNET_CORE_UNLOCK(sc);
1435 break;
1436
1437 case SIOCSIFFLAGS:
1438 VTNET_CORE_LOCK(sc);
1439 error = vtnet_ioctl_ifflags(sc);
1440 VTNET_CORE_UNLOCK(sc);
1441 break;
1442
1443 case SIOCADDMULTI:
1444 case SIOCDELMULTI:
1445 VTNET_CORE_LOCK(sc);
1446 error = vtnet_ioctl_multi(sc);
1447 VTNET_CORE_UNLOCK(sc);
1448 break;
1449
1450 case SIOCSIFMEDIA:
1451 case SIOCGIFMEDIA:
1452 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd);
1453 break;
1454
1455 case SIOCSIFCAP:
1456 VTNET_CORE_LOCK(sc);
1457 error = vtnet_ioctl_ifcap(sc, ifr);
1458 VTNET_CORE_UNLOCK(sc);
1459 VLAN_CAPABILITIES(ifp);
1460 break;
1461
1462 default:
1463 error = ether_ioctl(ifp, cmd, data);
1464 break;
1465 }
1466
1467 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc);
1468
1469 return (error);
1470 }
1471
1472 static int
vtnet_rxq_populate(struct vtnet_rxq * rxq)1473 vtnet_rxq_populate(struct vtnet_rxq *rxq)
1474 {
1475 struct virtqueue *vq;
1476 int nbufs, error;
1477
1478 #ifdef DEV_NETMAP
1479 error = vtnet_netmap_rxq_populate(rxq);
1480 if (error >= 0)
1481 return (error);
1482 #endif /* DEV_NETMAP */
1483
1484 vq = rxq->vtnrx_vq;
1485 error = ENOSPC;
1486
1487 for (nbufs = 0; !virtqueue_full(vq); nbufs++) {
1488 error = vtnet_rxq_new_buf(rxq);
1489 if (error)
1490 break;
1491 }
1492
1493 if (nbufs > 0) {
1494 virtqueue_notify(vq);
1495 /*
1496 * EMSGSIZE signifies the virtqueue did not have enough
1497 * entries available to hold the last mbuf. This is not
1498 * an error.
1499 */
1500 if (error == EMSGSIZE)
1501 error = 0;
1502 }
1503
1504 return (error);
1505 }
1506
1507 static void
vtnet_rxq_free_mbufs(struct vtnet_rxq * rxq)1508 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq)
1509 {
1510 struct virtqueue *vq;
1511 struct mbuf *m;
1512 int last;
1513 #ifdef DEV_NETMAP
1514 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp),
1515 rxq->vtnrx_id, NR_RX);
1516 #else /* !DEV_NETMAP */
1517 void *kring = NULL;
1518 #endif /* !DEV_NETMAP */
1519
1520 vq = rxq->vtnrx_vq;
1521 last = 0;
1522
1523 while ((m = virtqueue_drain(vq, &last)) != NULL) {
1524 if (kring == NULL)
1525 m_freem(m);
1526 }
1527
1528 KASSERT(virtqueue_empty(vq),
1529 ("%s: mbufs remaining in rx queue %p", __func__, rxq));
1530 }
1531
1532 static struct mbuf *
vtnet_rx_alloc_buf(struct vtnet_softc * sc,int nbufs,struct mbuf ** m_tailp)1533 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
1534 {
1535 struct mbuf *m_head, *m_tail, *m;
1536 int i, size;
1537
1538 m_head = NULL;
1539 size = sc->vtnet_rx_clustersz;
1540
1541 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1542 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs));
1543
1544 for (i = 0; i < nbufs; i++) {
1545 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size);
1546 if (m == NULL) {
1547 sc->vtnet_stats.mbuf_alloc_failed++;
1548 m_freem(m_head);
1549 return (NULL);
1550 }
1551
1552 m->m_len = size;
1553 /*
1554 * Need to offset the mbuf if the header we're going to add
1555 * will misalign.
1556 */
1557 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) {
1558 m_adj(m, VTNET_ETHER_ALIGN);
1559 }
1560 if (m_head != NULL) {
1561 m_tail->m_next = m;
1562 m_tail = m;
1563 } else
1564 m_head = m_tail = m;
1565 }
1566
1567 if (m_tailp != NULL)
1568 *m_tailp = m_tail;
1569
1570 return (m_head);
1571 }
1572
1573 /*
1574 * Slow path for when LRO without mergeable buffers is negotiated.
1575 */
1576 static int
vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq * rxq,struct mbuf * m0,int len0)1577 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0,
1578 int len0)
1579 {
1580 struct vtnet_softc *sc;
1581 struct mbuf *m, *m_prev, *m_new, *m_tail;
1582 int len, clustersz, nreplace, error;
1583
1584 sc = rxq->vtnrx_sc;
1585 clustersz = sc->vtnet_rx_clustersz;
1586 /*
1587 * Need to offset the mbuf if the header we're going to add will
1588 * misalign, account for that here.
1589 */
1590 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0)
1591 clustersz -= VTNET_ETHER_ALIGN;
1592
1593 m_prev = NULL;
1594 m_tail = NULL;
1595 nreplace = 0;
1596
1597 m = m0;
1598 len = len0;
1599
1600 /*
1601 * Since these mbuf chains are so large, avoid allocating a complete
1602 * replacement when the received frame did not consume the entire
1603 * chain. Unused mbufs are moved to the tail of the replacement mbuf.
1604 */
1605 while (len > 0) {
1606 if (m == NULL) {
1607 sc->vtnet_stats.rx_frame_too_large++;
1608 return (EMSGSIZE);
1609 }
1610
1611 /*
1612 * Every mbuf should have the expected cluster size since that
1613 * is also used to allocate the replacements.
1614 */
1615 KASSERT(m->m_len == clustersz,
1616 ("%s: mbuf size %d not expected cluster size %d", __func__,
1617 m->m_len, clustersz));
1618
1619 m->m_len = MIN(m->m_len, len);
1620 len -= m->m_len;
1621
1622 m_prev = m;
1623 m = m->m_next;
1624 nreplace++;
1625 }
1626
1627 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs,
1628 ("%s: invalid replacement mbuf count %d max %d", __func__,
1629 nreplace, sc->vtnet_rx_nmbufs));
1630
1631 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail);
1632 if (m_new == NULL) {
1633 m_prev->m_len = clustersz;
1634 return (ENOBUFS);
1635 }
1636
1637 /*
1638 * Move any unused mbufs from the received mbuf chain onto the
1639 * end of the replacement chain.
1640 */
1641 if (m_prev->m_next != NULL) {
1642 m_tail->m_next = m_prev->m_next;
1643 m_prev->m_next = NULL;
1644 }
1645
1646 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1647 if (error) {
1648 /*
1649 * The replacement is suppose to be an copy of the one
1650 * dequeued so this is a very unexpected error.
1651 *
1652 * Restore the m0 chain to the original state if it was
1653 * modified so we can then discard it.
1654 */
1655 if (m_tail->m_next != NULL) {
1656 m_prev->m_next = m_tail->m_next;
1657 m_tail->m_next = NULL;
1658 }
1659 m_prev->m_len = clustersz;
1660 sc->vtnet_stats.rx_enq_replacement_failed++;
1661 m_freem(m_new);
1662 }
1663
1664 return (error);
1665 }
1666
1667 static int
vtnet_rxq_replace_buf(struct vtnet_rxq * rxq,struct mbuf * m,int len)1668 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len)
1669 {
1670 struct vtnet_softc *sc;
1671 struct mbuf *m_new;
1672 int error;
1673
1674 sc = rxq->vtnrx_sc;
1675
1676 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1677 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len));
1678
1679 MPASS(m->m_next == NULL);
1680 if (m->m_len < len)
1681 return (EMSGSIZE);
1682
1683 m_new = vtnet_rx_alloc_buf(sc, 1, NULL);
1684 if (m_new == NULL)
1685 return (ENOBUFS);
1686
1687 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1688 if (error) {
1689 sc->vtnet_stats.rx_enq_replacement_failed++;
1690 m_freem(m_new);
1691 } else
1692 m->m_len = len;
1693
1694 return (error);
1695 }
1696
1697 static int
vtnet_rxq_enqueue_buf(struct vtnet_rxq * rxq,struct mbuf * m)1698 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1699 {
1700 struct vtnet_softc *sc;
1701 struct sglist *sg;
1702 int header_inlined, error;
1703
1704 sc = rxq->vtnrx_sc;
1705 sg = rxq->vtnrx_sg;
1706
1707 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1708 ("%s: mbuf chain without LRO_NOMRG", __func__));
1709 VTNET_RXQ_LOCK_ASSERT(rxq);
1710
1711 sglist_reset(sg);
1712 header_inlined = vtnet_modern(sc) ||
1713 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */
1714
1715 /*
1716 * Note: The mbuf has been already adjusted when we allocate it if we
1717 * have to do strict alignment.
1718 */
1719 if (header_inlined)
1720 error = sglist_append_mbuf(sg, m);
1721 else {
1722 struct vtnet_rx_header *rxhdr =
1723 mtod(m, struct vtnet_rx_header *);
1724 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr));
1725
1726 /* Append the header and remaining mbuf data. */
1727 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size);
1728 if (error)
1729 return (error);
1730 error = sglist_append(sg, &rxhdr[1],
1731 m->m_len - sizeof(struct vtnet_rx_header));
1732 if (error)
1733 return (error);
1734
1735 if (m->m_next != NULL)
1736 error = sglist_append_mbuf(sg, m->m_next);
1737 }
1738
1739 if (error)
1740 return (error);
1741
1742 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg));
1743 }
1744
1745 static int
vtnet_rxq_new_buf(struct vtnet_rxq * rxq)1746 vtnet_rxq_new_buf(struct vtnet_rxq *rxq)
1747 {
1748 struct vtnet_softc *sc;
1749 struct mbuf *m;
1750 int error;
1751
1752 sc = rxq->vtnrx_sc;
1753
1754 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL);
1755 if (m == NULL)
1756 return (ENOBUFS);
1757
1758 error = vtnet_rxq_enqueue_buf(rxq, m);
1759 if (error)
1760 m_freem(m);
1761
1762 return (error);
1763 }
1764
1765 #if defined(INET) || defined(INET6)
1766 static int
vtnet_rxq_csum_needs_csum(struct vtnet_rxq * rxq,struct mbuf * m,bool isipv6,int protocol,struct virtio_net_hdr * hdr)1767 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, bool isipv6,
1768 int protocol, struct virtio_net_hdr *hdr)
1769 {
1770 struct vtnet_softc *sc;
1771
1772 /*
1773 * The packet is likely from another VM on the same host or from the
1774 * host that itself performed checksum offloading so Tx/Rx is basically
1775 * a memcpy and the checksum has little value so far.
1776 */
1777
1778 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP,
1779 ("%s: unsupported IP protocol %d", __func__, protocol));
1780
1781 /*
1782 * If the user don't want us to fix it up here by computing the
1783 * checksum, just forward the order to compute the checksum by setting
1784 * the corresponding mbuf flag (e.g., CSUM_TCP).
1785 */
1786 sc = rxq->vtnrx_sc;
1787 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) {
1788 switch (protocol) {
1789 case IPPROTO_TCP:
1790 m->m_pkthdr.csum_flags |=
1791 (isipv6 ? CSUM_TCP_IPV6 : CSUM_TCP);
1792 break;
1793 case IPPROTO_UDP:
1794 m->m_pkthdr.csum_flags |=
1795 (isipv6 ? CSUM_UDP_IPV6 : CSUM_UDP);
1796 break;
1797 }
1798 m->m_pkthdr.csum_data = hdr->csum_offset;
1799 return (0);
1800 }
1801
1802 /*
1803 * Compute the checksum in the driver so the packet will contain a
1804 * valid checksum. The checksum is at csum_offset from csum_start.
1805 */
1806 int csum_off, csum_end;
1807 uint16_t csum;
1808
1809 csum_off = hdr->csum_start + hdr->csum_offset;
1810 csum_end = csum_off + sizeof(uint16_t);
1811
1812 /* Assume checksum will be in the first mbuf. */
1813 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end) {
1814 sc->vtnet_stats.rx_csum_bad_offset++;
1815 return (1);
1816 }
1817
1818 /*
1819 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the
1820 * checksum and write it at the specified offset. We could
1821 * try to verify the packet: csum_start should probably
1822 * correspond to the start of the TCP/UDP header.
1823 *
1824 * BMV: Need to properly handle UDP with zero checksum. Is
1825 * the IPv4 header checksum implicitly validated?
1826 */
1827 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start);
1828 *(uint16_t *)(mtodo(m, csum_off)) = csum;
1829 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1830 m->m_pkthdr.csum_data = 0xFFFF;
1831
1832 return (0);
1833 }
1834
1835 static void
vtnet_rxq_csum_data_valid(struct vtnet_rxq * rxq,struct mbuf * m,int protocol)1836 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m, int protocol)
1837 {
1838 KASSERT(protocol == IPPROTO_TCP || protocol == IPPROTO_UDP,
1839 ("%s: unsupported IP protocol %d", __func__, protocol));
1840
1841 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1842 m->m_pkthdr.csum_data = 0xFFFF;
1843 }
1844
1845 static int
vtnet_rxq_csum(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)1846 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m,
1847 struct virtio_net_hdr *hdr)
1848 {
1849 const struct ether_header *eh;
1850 struct vtnet_softc *sc;
1851 int hoff, protocol;
1852 uint16_t etype;
1853 bool isipv6;
1854
1855 KASSERT(hdr->flags &
1856 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID),
1857 ("%s: missing checksum offloading flag %x", __func__, hdr->flags));
1858
1859 eh = mtod(m, const struct ether_header *);
1860 etype = ntohs(eh->ether_type);
1861 if (etype == ETHERTYPE_VLAN) {
1862 /* TODO BMV: Handle QinQ. */
1863 const struct ether_vlan_header *evh =
1864 mtod(m, const struct ether_vlan_header *);
1865 etype = ntohs(evh->evl_proto);
1866 hoff = sizeof(struct ether_vlan_header);
1867 } else
1868 hoff = sizeof(struct ether_header);
1869
1870 sc = rxq->vtnrx_sc;
1871
1872 /* Check whether ethernet type is IP or IPv6, and get protocol. */
1873 switch (etype) {
1874 #if defined(INET)
1875 case ETHERTYPE_IP:
1876 if (__predict_false(m->m_len < hoff + sizeof(struct ip))) {
1877 sc->vtnet_stats.rx_csum_inaccessible_ipproto++;
1878 return (1);
1879 } else {
1880 struct ip *ip = (struct ip *)(m->m_data + hoff);
1881 protocol = ip->ip_p;
1882 }
1883 isipv6 = false;
1884 break;
1885 #endif
1886 #if defined(INET6)
1887 case ETHERTYPE_IPV6:
1888 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr))
1889 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0) {
1890 sc->vtnet_stats.rx_csum_inaccessible_ipproto++;
1891 return (1);
1892 }
1893 isipv6 = true;
1894 break;
1895 #endif
1896 default:
1897 sc->vtnet_stats.rx_csum_bad_ethtype++;
1898 return (1);
1899 }
1900
1901 /* Check whether protocol is TCP or UDP. */
1902 switch (protocol) {
1903 case IPPROTO_TCP:
1904 case IPPROTO_UDP:
1905 break;
1906 default:
1907 /*
1908 * FreeBSD does not support checksum offloading of this
1909 * protocol here.
1910 */
1911 sc->vtnet_stats.rx_csum_bad_ipproto++;
1912 return (1);
1913 }
1914
1915 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
1916 return (vtnet_rxq_csum_needs_csum(rxq, m, isipv6, protocol,
1917 hdr));
1918 else /* VIRTIO_NET_HDR_F_DATA_VALID */
1919 vtnet_rxq_csum_data_valid(rxq, m, protocol);
1920
1921 return (0);
1922 }
1923 #endif
1924
1925 static void
vtnet_rxq_discard_merged_bufs(struct vtnet_rxq * rxq,int nbufs)1926 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs)
1927 {
1928 struct mbuf *m;
1929
1930 while (--nbufs > 0) {
1931 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL);
1932 if (m == NULL)
1933 break;
1934 vtnet_rxq_discard_buf(rxq, m);
1935 }
1936 }
1937
1938 static void
vtnet_rxq_discard_buf(struct vtnet_rxq * rxq,struct mbuf * m)1939 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1940 {
1941 int error __diagused;
1942
1943 /*
1944 * Requeue the discarded mbuf. This should always be successful
1945 * since it was just dequeued.
1946 */
1947 error = vtnet_rxq_enqueue_buf(rxq, m);
1948 KASSERT(error == 0,
1949 ("%s: cannot requeue discarded mbuf %d", __func__, error));
1950 }
1951
1952 static int
vtnet_rxq_merged_eof(struct vtnet_rxq * rxq,struct mbuf * m_head,int nbufs)1953 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs)
1954 {
1955 struct vtnet_softc *sc;
1956 struct virtqueue *vq;
1957 struct mbuf *m_tail;
1958
1959 sc = rxq->vtnrx_sc;
1960 vq = rxq->vtnrx_vq;
1961 m_tail = m_head;
1962
1963 while (--nbufs > 0) {
1964 struct mbuf *m;
1965 uint32_t len;
1966
1967 m = virtqueue_dequeue(vq, &len);
1968 if (m == NULL) {
1969 rxq->vtnrx_stats.vrxs_ierrors++;
1970 goto fail;
1971 }
1972
1973 if (vtnet_rxq_new_buf(rxq) != 0) {
1974 rxq->vtnrx_stats.vrxs_iqdrops++;
1975 vtnet_rxq_discard_buf(rxq, m);
1976 if (nbufs > 1)
1977 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
1978 goto fail;
1979 }
1980
1981 if (m->m_len < len)
1982 len = m->m_len;
1983
1984 m->m_len = len;
1985 m->m_flags &= ~M_PKTHDR;
1986
1987 m_head->m_pkthdr.len += len;
1988 m_tail->m_next = m;
1989 m_tail = m;
1990 }
1991
1992 return (0);
1993
1994 fail:
1995 sc->vtnet_stats.rx_mergeable_failed++;
1996 m_freem(m_head);
1997
1998 return (1);
1999 }
2000
2001 #if defined(INET) || defined(INET6)
2002 static int
vtnet_lro_rx(struct vtnet_rxq * rxq,struct mbuf * m)2003 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m)
2004 {
2005 struct lro_ctrl *lro;
2006
2007 lro = &rxq->vtnrx_lro;
2008
2009 if (lro->lro_mbuf_max != 0) {
2010 tcp_lro_queue_mbuf(lro, m);
2011 return (0);
2012 }
2013
2014 return (tcp_lro_rx(lro, m, 0));
2015 }
2016 #endif
2017
2018 static void
vtnet_rxq_input(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)2019 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m,
2020 struct virtio_net_hdr *hdr)
2021 {
2022 struct vtnet_softc *sc;
2023 if_t ifp;
2024
2025 sc = rxq->vtnrx_sc;
2026 ifp = sc->vtnet_ifp;
2027
2028 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) {
2029 struct ether_header *eh = mtod(m, struct ether_header *);
2030 if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
2031 vtnet_vlan_tag_remove(m);
2032 /*
2033 * With the 802.1Q header removed, update the
2034 * checksum starting location accordingly.
2035 */
2036 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
2037 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN;
2038 }
2039 }
2040
2041 m->m_pkthdr.flowid = rxq->vtnrx_id;
2042 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
2043
2044 if (hdr->flags &
2045 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) {
2046 #if defined(INET) || defined(INET6)
2047 if (vtnet_rxq_csum(rxq, m, hdr) == 0)
2048 rxq->vtnrx_stats.vrxs_csum++;
2049 else
2050 rxq->vtnrx_stats.vrxs_csum_failed++;
2051 #else
2052 sc->vtnet_stats.rx_csum_bad_ethtype++;
2053 rxq->vtnrx_stats.vrxs_csum_failed++;
2054 #endif
2055 }
2056
2057 if (hdr->gso_size != 0) {
2058 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2059 case VIRTIO_NET_HDR_GSO_TCPV4:
2060 case VIRTIO_NET_HDR_GSO_TCPV6:
2061 m->m_pkthdr.lro_nsegs =
2062 howmany(m->m_pkthdr.len, hdr->gso_size);
2063 rxq->vtnrx_stats.vrxs_host_lro++;
2064 break;
2065 }
2066 }
2067
2068 rxq->vtnrx_stats.vrxs_ipackets++;
2069 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len;
2070
2071 #if defined(INET) || defined(INET6)
2072 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) {
2073 if (vtnet_lro_rx(rxq, m) == 0)
2074 return;
2075 }
2076 #endif
2077
2078 if_input(ifp, m);
2079 }
2080
2081 static int
vtnet_rxq_eof(struct vtnet_rxq * rxq)2082 vtnet_rxq_eof(struct vtnet_rxq *rxq)
2083 {
2084 struct virtio_net_hdr lhdr, *hdr;
2085 struct vtnet_softc *sc;
2086 if_t ifp;
2087 struct virtqueue *vq;
2088 int deq, count;
2089
2090 sc = rxq->vtnrx_sc;
2091 vq = rxq->vtnrx_vq;
2092 ifp = sc->vtnet_ifp;
2093 deq = 0;
2094 count = sc->vtnet_rx_process_limit;
2095
2096 VTNET_RXQ_LOCK_ASSERT(rxq);
2097
2098 CURVNET_SET(if_getvnet(ifp));
2099 while (count-- > 0) {
2100 struct mbuf *m;
2101 uint32_t len, nbufs, adjsz;
2102
2103 m = virtqueue_dequeue(vq, &len);
2104 if (m == NULL)
2105 break;
2106 deq++;
2107
2108 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) {
2109 rxq->vtnrx_stats.vrxs_ierrors++;
2110 vtnet_rxq_discard_buf(rxq, m);
2111 continue;
2112 }
2113
2114 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) {
2115 struct virtio_net_hdr_mrg_rxbuf *mhdr =
2116 mtod(m, struct virtio_net_hdr_mrg_rxbuf *);
2117 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED);
2118 nbufs = vtnet_htog16(sc, mhdr->num_buffers);
2119 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2120 } else if (vtnet_modern(sc)) {
2121 nbufs = 1; /* num_buffers is always 1 */
2122 adjsz = sizeof(struct virtio_net_hdr_v1);
2123 } else {
2124 nbufs = 1;
2125 adjsz = sizeof(struct vtnet_rx_header);
2126 /*
2127 * Account for our gap between the header and start of
2128 * data to keep the segments separated.
2129 */
2130 len += VTNET_RX_HEADER_PAD;
2131 }
2132
2133 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) {
2134 rxq->vtnrx_stats.vrxs_iqdrops++;
2135 vtnet_rxq_discard_buf(rxq, m);
2136 if (nbufs > 1)
2137 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
2138 continue;
2139 }
2140
2141 m->m_pkthdr.len = len;
2142 m->m_pkthdr.rcvif = ifp;
2143 m->m_pkthdr.csum_flags = 0;
2144
2145 if (nbufs > 1) {
2146 /* Dequeue the rest of chain. */
2147 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0)
2148 continue;
2149 }
2150
2151 kmsan_mark_mbuf(m, KMSAN_STATE_INITED);
2152
2153 /*
2154 * Save an endian swapped version of the header prior to it
2155 * being stripped. The header is always at the start of the
2156 * mbuf data. num_buffers was already saved (and not needed)
2157 * so use the standard header.
2158 */
2159 hdr = mtod(m, struct virtio_net_hdr *);
2160 lhdr.flags = hdr->flags;
2161 lhdr.gso_type = hdr->gso_type;
2162 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len);
2163 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size);
2164 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start);
2165 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset);
2166 m_adj(m, adjsz);
2167
2168 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) {
2169 pfil_return_t pfil;
2170
2171 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL);
2172 switch (pfil) {
2173 case PFIL_DROPPED:
2174 case PFIL_CONSUMED:
2175 continue;
2176 default:
2177 KASSERT(pfil == PFIL_PASS,
2178 ("Filter returned %d!", pfil));
2179 }
2180 }
2181
2182 vtnet_rxq_input(rxq, m, &lhdr);
2183 }
2184
2185 if (deq > 0) {
2186 #if defined(INET) || defined(INET6)
2187 if (vtnet_software_lro(sc))
2188 tcp_lro_flush_all(&rxq->vtnrx_lro);
2189 #endif
2190 virtqueue_notify(vq);
2191 }
2192 CURVNET_RESTORE();
2193
2194 return (count > 0 ? 0 : EAGAIN);
2195 }
2196
2197 static void
vtnet_rx_vq_process(struct vtnet_rxq * rxq,int tries)2198 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries)
2199 {
2200 struct vtnet_softc *sc;
2201 if_t ifp;
2202 u_int more;
2203 #ifdef DEV_NETMAP
2204 int nmirq;
2205 #endif /* DEV_NETMAP */
2206
2207 sc = rxq->vtnrx_sc;
2208 ifp = sc->vtnet_ifp;
2209
2210 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) {
2211 /*
2212 * Ignore this interrupt. Either this is a spurious interrupt
2213 * or multiqueue without per-VQ MSIX so every queue needs to
2214 * be polled (a brain dead configuration we could try harder
2215 * to avoid).
2216 */
2217 vtnet_rxq_disable_intr(rxq);
2218 return;
2219 }
2220
2221 VTNET_RXQ_LOCK(rxq);
2222
2223 #ifdef DEV_NETMAP
2224 /*
2225 * We call netmap_rx_irq() under lock to prevent concurrent calls.
2226 * This is not necessary to serialize the access to the RX vq, but
2227 * rather to avoid races that may happen if this interface is
2228 * attached to a VALE switch, which would cause received packets
2229 * to stall in the RX queue (nm_kr_tryget() could find the kring
2230 * busy when called from netmap_bwrap_intr_notify()).
2231 */
2232 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more);
2233 if (nmirq != NM_IRQ_PASS) {
2234 VTNET_RXQ_UNLOCK(rxq);
2235 if (nmirq == NM_IRQ_RESCHED) {
2236 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2237 }
2238 return;
2239 }
2240 #endif /* DEV_NETMAP */
2241
2242 again:
2243 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2244 VTNET_RXQ_UNLOCK(rxq);
2245 return;
2246 }
2247
2248 more = vtnet_rxq_eof(rxq);
2249 if (more || vtnet_rxq_enable_intr(rxq) != 0) {
2250 if (!more)
2251 vtnet_rxq_disable_intr(rxq);
2252 /*
2253 * This is an occasional condition or race (when !more),
2254 * so retry a few times before scheduling the taskqueue.
2255 */
2256 if (tries-- > 0)
2257 goto again;
2258
2259 rxq->vtnrx_stats.vrxs_rescheduled++;
2260 VTNET_RXQ_UNLOCK(rxq);
2261 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2262 } else
2263 VTNET_RXQ_UNLOCK(rxq);
2264 }
2265
2266 static void
vtnet_rx_vq_intr(void * xrxq)2267 vtnet_rx_vq_intr(void *xrxq)
2268 {
2269 struct vtnet_rxq *rxq;
2270
2271 rxq = xrxq;
2272 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES);
2273 }
2274
2275 static void
vtnet_rxq_tq_intr(void * xrxq,int pending __unused)2276 vtnet_rxq_tq_intr(void *xrxq, int pending __unused)
2277 {
2278 struct vtnet_rxq *rxq;
2279
2280 rxq = xrxq;
2281 vtnet_rx_vq_process(rxq, 0);
2282 }
2283
2284 static int
vtnet_txq_intr_threshold(struct vtnet_txq * txq)2285 vtnet_txq_intr_threshold(struct vtnet_txq *txq)
2286 {
2287 struct vtnet_softc *sc;
2288 int threshold;
2289
2290 sc = txq->vtntx_sc;
2291
2292 /*
2293 * The Tx interrupt is disabled until the queue free count falls
2294 * below our threshold. Completed frames are drained from the Tx
2295 * virtqueue before transmitting new frames and in the watchdog
2296 * callout, so the frequency of Tx interrupts is greatly reduced,
2297 * at the cost of not freeing mbufs as quickly as they otherwise
2298 * would be.
2299 */
2300 threshold = virtqueue_size(txq->vtntx_vq) / 4;
2301
2302 /*
2303 * Without indirect descriptors, leave enough room for the most
2304 * segments we handle.
2305 */
2306 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 &&
2307 threshold < sc->vtnet_tx_nsegs)
2308 threshold = sc->vtnet_tx_nsegs;
2309
2310 return (threshold);
2311 }
2312
2313 static int
vtnet_txq_below_threshold(struct vtnet_txq * txq)2314 vtnet_txq_below_threshold(struct vtnet_txq *txq)
2315 {
2316 struct virtqueue *vq;
2317
2318 vq = txq->vtntx_vq;
2319
2320 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold);
2321 }
2322
2323 static int
vtnet_txq_notify(struct vtnet_txq * txq)2324 vtnet_txq_notify(struct vtnet_txq *txq)
2325 {
2326 struct virtqueue *vq;
2327
2328 vq = txq->vtntx_vq;
2329
2330 txq->vtntx_watchdog = VTNET_TX_TIMEOUT;
2331 virtqueue_notify(vq);
2332
2333 if (vtnet_txq_enable_intr(txq) == 0)
2334 return (0);
2335
2336 /*
2337 * Drain frames that were completed since last checked. If this
2338 * causes the queue to go above the threshold, the caller should
2339 * continue transmitting.
2340 */
2341 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) {
2342 virtqueue_disable_intr(vq);
2343 return (1);
2344 }
2345
2346 return (0);
2347 }
2348
2349 static void
vtnet_txq_free_mbufs(struct vtnet_txq * txq)2350 vtnet_txq_free_mbufs(struct vtnet_txq *txq)
2351 {
2352 struct virtqueue *vq;
2353 struct vtnet_tx_header *txhdr;
2354 int last;
2355 #ifdef DEV_NETMAP
2356 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp),
2357 txq->vtntx_id, NR_TX);
2358 #else /* !DEV_NETMAP */
2359 void *kring = NULL;
2360 #endif /* !DEV_NETMAP */
2361
2362 vq = txq->vtntx_vq;
2363 last = 0;
2364
2365 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) {
2366 if (kring == NULL) {
2367 m_freem(txhdr->vth_mbuf);
2368 uma_zfree(vtnet_tx_header_zone, txhdr);
2369 }
2370 }
2371
2372 KASSERT(virtqueue_empty(vq),
2373 ("%s: mbufs remaining in tx queue %p", __func__, txq));
2374 }
2375
2376 /*
2377 * BMV: This can go away once we finally have offsets in the mbuf header.
2378 */
2379 static int
vtnet_txq_offload_ctx(struct vtnet_txq * txq,struct mbuf * m,int * etype,int * proto,int * start)2380 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype,
2381 int *proto, int *start)
2382 {
2383 struct vtnet_softc *sc;
2384 struct ether_vlan_header *evh;
2385 #if defined(INET) || defined(INET6)
2386 int offset;
2387 #endif
2388
2389 sc = txq->vtntx_sc;
2390
2391 evh = mtod(m, struct ether_vlan_header *);
2392 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
2393 /* BMV: We should handle nested VLAN tags too. */
2394 *etype = ntohs(evh->evl_proto);
2395 #if defined(INET) || defined(INET6)
2396 offset = sizeof(struct ether_vlan_header);
2397 #endif
2398 } else {
2399 *etype = ntohs(evh->evl_encap_proto);
2400 #if defined(INET) || defined(INET6)
2401 offset = sizeof(struct ether_header);
2402 #endif
2403 }
2404
2405 switch (*etype) {
2406 #if defined(INET)
2407 case ETHERTYPE_IP: {
2408 struct ip *ip, iphdr;
2409 if (__predict_false(m->m_len < offset + sizeof(struct ip))) {
2410 m_copydata(m, offset, sizeof(struct ip),
2411 (caddr_t) &iphdr);
2412 ip = &iphdr;
2413 } else
2414 ip = (struct ip *)(m->m_data + offset);
2415 *proto = ip->ip_p;
2416 *start = offset + (ip->ip_hl << 2);
2417 break;
2418 }
2419 #endif
2420 #if defined(INET6)
2421 case ETHERTYPE_IPV6:
2422 *proto = -1;
2423 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto);
2424 /* Assert the network stack sent us a valid packet. */
2425 KASSERT(*start > offset,
2426 ("%s: mbuf %p start %d offset %d proto %d", __func__, m,
2427 *start, offset, *proto));
2428 break;
2429 #endif
2430 default:
2431 sc->vtnet_stats.tx_csum_unknown_ethtype++;
2432 return (EINVAL);
2433 }
2434
2435 return (0);
2436 }
2437
2438 static int
vtnet_txq_offload_tso(struct vtnet_txq * txq,struct mbuf * m,int eth_type,int offset,struct virtio_net_hdr * hdr)2439 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type,
2440 int offset, struct virtio_net_hdr *hdr)
2441 {
2442 static struct timeval lastecn;
2443 static int curecn;
2444 struct vtnet_softc *sc;
2445 struct tcphdr *tcp, tcphdr;
2446
2447 sc = txq->vtntx_sc;
2448
2449 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) {
2450 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr);
2451 tcp = &tcphdr;
2452 } else
2453 tcp = (struct tcphdr *)(m->m_data + offset);
2454
2455 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2));
2456 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz);
2457 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 :
2458 VIRTIO_NET_HDR_GSO_TCPV6;
2459
2460 if (__predict_false(tcp_get_flags(tcp) & TH_CWR)) {
2461 /*
2462 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In
2463 * FreeBSD, ECN support is not on a per-interface basis,
2464 * but globally via the net.inet.tcp.ecn.enable sysctl
2465 * knob. The default is off.
2466 */
2467 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) {
2468 if (ppsratecheck(&lastecn, &curecn, 1))
2469 if_printf(sc->vtnet_ifp,
2470 "TSO with ECN not negotiated with host\n");
2471 return (ENOTSUP);
2472 }
2473 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2474 }
2475
2476 txq->vtntx_stats.vtxs_tso++;
2477
2478 return (0);
2479 }
2480
2481 static struct mbuf *
vtnet_txq_offload(struct vtnet_txq * txq,struct mbuf * m,struct virtio_net_hdr * hdr)2482 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m,
2483 struct virtio_net_hdr *hdr)
2484 {
2485 struct vtnet_softc *sc;
2486 int flags, etype, csum_start, proto, error;
2487
2488 sc = txq->vtntx_sc;
2489 flags = m->m_pkthdr.csum_flags;
2490
2491 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start);
2492 if (error)
2493 goto drop;
2494
2495 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) {
2496 /* Sanity check the parsed mbuf matches the offload flags. */
2497 if (__predict_false((flags & VTNET_CSUM_OFFLOAD &&
2498 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6
2499 && etype != ETHERTYPE_IPV6))) {
2500 sc->vtnet_stats.tx_csum_proto_mismatch++;
2501 goto drop;
2502 }
2503
2504 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
2505 hdr->csum_start = vtnet_gtoh16(sc, csum_start);
2506 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data);
2507 txq->vtntx_stats.vtxs_csum++;
2508 } else if ((flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) &&
2509 (proto == IPPROTO_TCP || proto == IPPROTO_UDP) &&
2510 (m->m_pkthdr.csum_data == 0xFFFF)) {
2511 hdr->flags |= VIRTIO_NET_HDR_F_DATA_VALID;
2512 }
2513
2514 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) {
2515 /*
2516 * Sanity check the parsed mbuf IP protocol is TCP, and
2517 * VirtIO TSO reqires the checksum offloading above.
2518 */
2519 if (__predict_false(proto != IPPROTO_TCP)) {
2520 sc->vtnet_stats.tx_tso_not_tcp++;
2521 goto drop;
2522 } else if (__predict_false((hdr->flags &
2523 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) {
2524 sc->vtnet_stats.tx_tso_without_csum++;
2525 goto drop;
2526 }
2527
2528 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr);
2529 if (error)
2530 goto drop;
2531 }
2532
2533 return (m);
2534
2535 drop:
2536 m_freem(m);
2537 return (NULL);
2538 }
2539
2540 static int
vtnet_txq_enqueue_buf(struct vtnet_txq * txq,struct mbuf ** m_head,struct vtnet_tx_header * txhdr)2541 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head,
2542 struct vtnet_tx_header *txhdr)
2543 {
2544 struct vtnet_softc *sc;
2545 struct virtqueue *vq;
2546 struct sglist *sg;
2547 struct mbuf *m;
2548 int error;
2549
2550 sc = txq->vtntx_sc;
2551 vq = txq->vtntx_vq;
2552 sg = txq->vtntx_sg;
2553 m = *m_head;
2554
2555 sglist_reset(sg);
2556 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size);
2557 if (error != 0 || sg->sg_nseg != 1) {
2558 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d",
2559 __func__, error, sg->sg_nseg));
2560 goto fail;
2561 }
2562
2563 error = sglist_append_mbuf(sg, m);
2564 if (error) {
2565 m = m_defrag(m, M_NOWAIT);
2566 if (m == NULL) {
2567 sc->vtnet_stats.tx_defrag_failed++;
2568 goto fail;
2569 }
2570
2571 *m_head = m;
2572 sc->vtnet_stats.tx_defragged++;
2573
2574 error = sglist_append_mbuf(sg, m);
2575 if (error)
2576 goto fail;
2577 }
2578
2579 txhdr->vth_mbuf = m;
2580 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0);
2581
2582 return (error);
2583
2584 fail:
2585 m_freem(*m_head);
2586 *m_head = NULL;
2587
2588 return (ENOBUFS);
2589 }
2590
2591 static int
vtnet_txq_encap(struct vtnet_txq * txq,struct mbuf ** m_head,int flags)2592 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags)
2593 {
2594 struct vtnet_tx_header *txhdr;
2595 struct virtio_net_hdr *hdr;
2596 struct mbuf *m;
2597 int error;
2598
2599 m = *m_head;
2600 M_ASSERTPKTHDR(m);
2601
2602 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO);
2603 if (txhdr == NULL) {
2604 m_freem(m);
2605 *m_head = NULL;
2606 return (ENOMEM);
2607 }
2608
2609 /*
2610 * Always use the non-mergeable header, regardless if mergable headers
2611 * were negotiated, because for transmit num_buffers is always zero.
2612 * The vtnet_hdr_size is used to enqueue the right header size segment.
2613 */
2614 hdr = &txhdr->vth_uhdr.hdr;
2615
2616 if (m->m_flags & M_VLANTAG) {
2617 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2618 if ((*m_head = m) == NULL) {
2619 error = ENOBUFS;
2620 goto fail;
2621 }
2622 m->m_flags &= ~M_VLANTAG;
2623 }
2624
2625 if (m->m_pkthdr.csum_flags &
2626 (VTNET_CSUM_ALL_OFFLOAD | CSUM_DATA_VALID)) {
2627 m = vtnet_txq_offload(txq, m, hdr);
2628 if ((*m_head = m) == NULL) {
2629 error = ENOBUFS;
2630 goto fail;
2631 }
2632 }
2633
2634 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr);
2635 fail:
2636 if (error)
2637 uma_zfree(vtnet_tx_header_zone, txhdr);
2638
2639 return (error);
2640 }
2641
2642
2643 static void
vtnet_start_locked(struct vtnet_txq * txq,if_t ifp)2644 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp)
2645 {
2646 struct vtnet_softc *sc;
2647 struct virtqueue *vq;
2648 struct mbuf *m0;
2649 int tries, enq;
2650
2651 sc = txq->vtntx_sc;
2652 vq = txq->vtntx_vq;
2653 tries = 0;
2654
2655 VTNET_TXQ_LOCK_ASSERT(txq);
2656
2657 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 ||
2658 sc->vtnet_link_active == 0)
2659 return;
2660
2661 vtnet_txq_eof(txq);
2662
2663 again:
2664 enq = 0;
2665
2666 while (!if_sendq_empty(ifp)) {
2667 if (virtqueue_full(vq))
2668 break;
2669
2670 m0 = if_dequeue(ifp);
2671 if (m0 == NULL)
2672 break;
2673
2674 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) {
2675 if (m0 != NULL)
2676 if_sendq_prepend(ifp, m0);
2677 break;
2678 }
2679
2680 enq++;
2681 ETHER_BPF_MTAP(ifp, m0);
2682 }
2683
2684 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2685 if (tries++ < VTNET_NOTIFY_RETRIES)
2686 goto again;
2687
2688 txq->vtntx_stats.vtxs_rescheduled++;
2689 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2690 }
2691 }
2692
2693 static void
vtnet_start(if_t ifp)2694 vtnet_start(if_t ifp)
2695 {
2696 struct vtnet_softc *sc;
2697 struct vtnet_txq *txq;
2698
2699 sc = if_getsoftc(ifp);
2700 txq = &sc->vtnet_txqs[0];
2701
2702 VTNET_TXQ_LOCK(txq);
2703 vtnet_start_locked(txq, ifp);
2704 VTNET_TXQ_UNLOCK(txq);
2705 }
2706
2707
2708 static int
vtnet_txq_mq_start_locked(struct vtnet_txq * txq,struct mbuf * m)2709 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m)
2710 {
2711 struct vtnet_softc *sc;
2712 struct virtqueue *vq;
2713 struct buf_ring *br;
2714 if_t ifp;
2715 int enq, tries, error;
2716
2717 sc = txq->vtntx_sc;
2718 vq = txq->vtntx_vq;
2719 br = txq->vtntx_br;
2720 ifp = sc->vtnet_ifp;
2721 tries = 0;
2722 error = 0;
2723
2724 VTNET_TXQ_LOCK_ASSERT(txq);
2725
2726 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 ||
2727 sc->vtnet_link_active == 0) {
2728 if (m != NULL)
2729 error = drbr_enqueue(ifp, br, m);
2730 return (error);
2731 }
2732
2733 if (m != NULL) {
2734 error = drbr_enqueue(ifp, br, m);
2735 if (error)
2736 return (error);
2737 }
2738
2739 vtnet_txq_eof(txq);
2740
2741 again:
2742 enq = 0;
2743
2744 while ((m = drbr_peek(ifp, br)) != NULL) {
2745 if (virtqueue_full(vq)) {
2746 drbr_putback(ifp, br, m);
2747 break;
2748 }
2749
2750 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) {
2751 if (m != NULL)
2752 drbr_putback(ifp, br, m);
2753 else
2754 drbr_advance(ifp, br);
2755 break;
2756 }
2757 drbr_advance(ifp, br);
2758
2759 enq++;
2760 ETHER_BPF_MTAP(ifp, m);
2761 }
2762
2763 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2764 if (tries++ < VTNET_NOTIFY_RETRIES)
2765 goto again;
2766
2767 txq->vtntx_stats.vtxs_rescheduled++;
2768 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2769 }
2770
2771 return (0);
2772 }
2773
2774 static int
vtnet_txq_mq_start(if_t ifp,struct mbuf * m)2775 vtnet_txq_mq_start(if_t ifp, struct mbuf *m)
2776 {
2777 struct vtnet_softc *sc;
2778 struct vtnet_txq *txq;
2779 int i, npairs, error;
2780
2781 sc = if_getsoftc(ifp);
2782 npairs = sc->vtnet_act_vq_pairs;
2783
2784 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
2785 i = m->m_pkthdr.flowid % npairs;
2786 else
2787 i = curcpu % npairs;
2788
2789 txq = &sc->vtnet_txqs[i];
2790
2791 if (VTNET_TXQ_TRYLOCK(txq) != 0) {
2792 error = vtnet_txq_mq_start_locked(txq, m);
2793 VTNET_TXQ_UNLOCK(txq);
2794 } else {
2795 error = drbr_enqueue(ifp, txq->vtntx_br, m);
2796 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask);
2797 }
2798
2799 return (error);
2800 }
2801
2802 static void
vtnet_txq_tq_deferred(void * xtxq,int pending __unused)2803 vtnet_txq_tq_deferred(void *xtxq, int pending __unused)
2804 {
2805 struct vtnet_softc *sc;
2806 struct vtnet_txq *txq;
2807
2808 txq = xtxq;
2809 sc = txq->vtntx_sc;
2810
2811 VTNET_TXQ_LOCK(txq);
2812 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br))
2813 vtnet_txq_mq_start_locked(txq, NULL);
2814 VTNET_TXQ_UNLOCK(txq);
2815 }
2816
2817
2818 static void
vtnet_txq_start(struct vtnet_txq * txq)2819 vtnet_txq_start(struct vtnet_txq *txq)
2820 {
2821 struct vtnet_softc *sc;
2822 if_t ifp;
2823
2824 sc = txq->vtntx_sc;
2825 ifp = sc->vtnet_ifp;
2826
2827 if (!VTNET_ALTQ_ENABLED) {
2828 if (!drbr_empty(ifp, txq->vtntx_br))
2829 vtnet_txq_mq_start_locked(txq, NULL);
2830 } else {
2831 if (!if_sendq_empty(ifp))
2832 vtnet_start_locked(txq, ifp);
2833
2834 }
2835 }
2836
2837 static void
vtnet_txq_tq_intr(void * xtxq,int pending __unused)2838 vtnet_txq_tq_intr(void *xtxq, int pending __unused)
2839 {
2840 struct vtnet_softc *sc;
2841 struct vtnet_txq *txq;
2842 if_t ifp;
2843
2844 txq = xtxq;
2845 sc = txq->vtntx_sc;
2846 ifp = sc->vtnet_ifp;
2847
2848 VTNET_TXQ_LOCK(txq);
2849
2850 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2851 VTNET_TXQ_UNLOCK(txq);
2852 return;
2853 }
2854
2855 vtnet_txq_eof(txq);
2856 vtnet_txq_start(txq);
2857
2858 VTNET_TXQ_UNLOCK(txq);
2859 }
2860
2861 static int
vtnet_txq_eof(struct vtnet_txq * txq)2862 vtnet_txq_eof(struct vtnet_txq *txq)
2863 {
2864 struct virtqueue *vq;
2865 struct vtnet_tx_header *txhdr;
2866 struct mbuf *m;
2867 int deq;
2868
2869 vq = txq->vtntx_vq;
2870 deq = 0;
2871 VTNET_TXQ_LOCK_ASSERT(txq);
2872
2873 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) {
2874 m = txhdr->vth_mbuf;
2875 deq++;
2876
2877 txq->vtntx_stats.vtxs_opackets++;
2878 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len;
2879 if (m->m_flags & M_MCAST)
2880 txq->vtntx_stats.vtxs_omcasts++;
2881
2882 m_freem(m);
2883 uma_zfree(vtnet_tx_header_zone, txhdr);
2884 }
2885
2886 if (virtqueue_empty(vq))
2887 txq->vtntx_watchdog = 0;
2888
2889 return (deq);
2890 }
2891
2892 static void
vtnet_tx_vq_intr(void * xtxq)2893 vtnet_tx_vq_intr(void *xtxq)
2894 {
2895 struct vtnet_softc *sc;
2896 struct vtnet_txq *txq;
2897 if_t ifp;
2898
2899 txq = xtxq;
2900 sc = txq->vtntx_sc;
2901 ifp = sc->vtnet_ifp;
2902
2903 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) {
2904 /*
2905 * Ignore this interrupt. Either this is a spurious interrupt
2906 * or multiqueue without per-VQ MSIX so every queue needs to
2907 * be polled (a brain dead configuration we could try harder
2908 * to avoid).
2909 */
2910 vtnet_txq_disable_intr(txq);
2911 return;
2912 }
2913
2914 #ifdef DEV_NETMAP
2915 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS)
2916 return;
2917 #endif /* DEV_NETMAP */
2918
2919 VTNET_TXQ_LOCK(txq);
2920
2921 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2922 VTNET_TXQ_UNLOCK(txq);
2923 return;
2924 }
2925
2926 vtnet_txq_eof(txq);
2927 vtnet_txq_start(txq);
2928
2929 VTNET_TXQ_UNLOCK(txq);
2930 }
2931
2932 static void
vtnet_tx_start_all(struct vtnet_softc * sc)2933 vtnet_tx_start_all(struct vtnet_softc *sc)
2934 {
2935 struct vtnet_txq *txq;
2936 int i;
2937
2938 VTNET_CORE_LOCK_ASSERT(sc);
2939
2940 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2941 txq = &sc->vtnet_txqs[i];
2942
2943 VTNET_TXQ_LOCK(txq);
2944 vtnet_txq_start(txq);
2945 VTNET_TXQ_UNLOCK(txq);
2946 }
2947 }
2948
2949 static void
vtnet_qflush(if_t ifp)2950 vtnet_qflush(if_t ifp)
2951 {
2952 struct vtnet_softc *sc;
2953 struct vtnet_txq *txq;
2954 struct mbuf *m;
2955 int i;
2956
2957 sc = if_getsoftc(ifp);
2958
2959 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2960 txq = &sc->vtnet_txqs[i];
2961
2962 VTNET_TXQ_LOCK(txq);
2963 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL)
2964 m_freem(m);
2965 VTNET_TXQ_UNLOCK(txq);
2966 }
2967
2968 if_qflush(ifp);
2969 }
2970
2971 static int
vtnet_watchdog(struct vtnet_txq * txq)2972 vtnet_watchdog(struct vtnet_txq *txq)
2973 {
2974 if_t ifp;
2975
2976 ifp = txq->vtntx_sc->vtnet_ifp;
2977
2978 VTNET_TXQ_LOCK(txq);
2979 if (txq->vtntx_watchdog == 1) {
2980 /*
2981 * Only drain completed frames if the watchdog is about to
2982 * expire. If any frames were drained, there may be enough
2983 * free descriptors now available to transmit queued frames.
2984 * In that case, the timer will immediately be decremented
2985 * below, but the timeout is generous enough that should not
2986 * be a problem.
2987 */
2988 if (vtnet_txq_eof(txq) != 0)
2989 vtnet_txq_start(txq);
2990 }
2991
2992 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) {
2993 VTNET_TXQ_UNLOCK(txq);
2994 return (0);
2995 }
2996 VTNET_TXQ_UNLOCK(txq);
2997
2998 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id);
2999 return (1);
3000 }
3001
3002 static void
vtnet_accum_stats(struct vtnet_softc * sc,struct vtnet_rxq_stats * rxacc,struct vtnet_txq_stats * txacc)3003 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc,
3004 struct vtnet_txq_stats *txacc)
3005 {
3006
3007 bzero(rxacc, sizeof(struct vtnet_rxq_stats));
3008 bzero(txacc, sizeof(struct vtnet_txq_stats));
3009
3010 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3011 struct vtnet_rxq_stats *rxst;
3012 struct vtnet_txq_stats *txst;
3013
3014 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
3015 rxacc->vrxs_ipackets += rxst->vrxs_ipackets;
3016 rxacc->vrxs_ibytes += rxst->vrxs_ibytes;
3017 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops;
3018 rxacc->vrxs_csum += rxst->vrxs_csum;
3019 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed;
3020 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled;
3021
3022 txst = &sc->vtnet_txqs[i].vtntx_stats;
3023 txacc->vtxs_opackets += txst->vtxs_opackets;
3024 txacc->vtxs_obytes += txst->vtxs_obytes;
3025 txacc->vtxs_csum += txst->vtxs_csum;
3026 txacc->vtxs_tso += txst->vtxs_tso;
3027 txacc->vtxs_rescheduled += txst->vtxs_rescheduled;
3028 }
3029 }
3030
3031 static uint64_t
vtnet_get_counter(if_t ifp,ift_counter cnt)3032 vtnet_get_counter(if_t ifp, ift_counter cnt)
3033 {
3034 struct vtnet_softc *sc;
3035 struct vtnet_rxq_stats rxaccum;
3036 struct vtnet_txq_stats txaccum;
3037
3038 sc = if_getsoftc(ifp);
3039 vtnet_accum_stats(sc, &rxaccum, &txaccum);
3040
3041 switch (cnt) {
3042 case IFCOUNTER_IPACKETS:
3043 return (rxaccum.vrxs_ipackets);
3044 case IFCOUNTER_IQDROPS:
3045 return (rxaccum.vrxs_iqdrops);
3046 case IFCOUNTER_IERRORS:
3047 return (rxaccum.vrxs_ierrors);
3048 case IFCOUNTER_IBYTES:
3049 return (rxaccum.vrxs_ibytes);
3050 case IFCOUNTER_OPACKETS:
3051 return (txaccum.vtxs_opackets);
3052 case IFCOUNTER_OBYTES:
3053 return (txaccum.vtxs_obytes);
3054 case IFCOUNTER_OMCASTS:
3055 return (txaccum.vtxs_omcasts);
3056 default:
3057 return (if_get_counter_default(ifp, cnt));
3058 }
3059 }
3060
3061 static void
vtnet_tick(void * xsc)3062 vtnet_tick(void *xsc)
3063 {
3064 struct vtnet_softc *sc;
3065 if_t ifp;
3066 int i, timedout;
3067
3068 sc = xsc;
3069 ifp = sc->vtnet_ifp;
3070 timedout = 0;
3071
3072 VTNET_CORE_LOCK_ASSERT(sc);
3073
3074 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
3075 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]);
3076
3077 if (timedout != 0) {
3078 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3079 vtnet_init_locked(sc, 0);
3080 } else
3081 callout_schedule(&sc->vtnet_tick_ch, hz);
3082 }
3083
3084 static void
vtnet_start_taskqueues(struct vtnet_softc * sc)3085 vtnet_start_taskqueues(struct vtnet_softc *sc)
3086 {
3087 device_t dev;
3088 struct vtnet_rxq *rxq;
3089 struct vtnet_txq *txq;
3090 int i, error;
3091
3092 dev = sc->vtnet_dev;
3093
3094 /*
3095 * Errors here are very difficult to recover from - we cannot
3096 * easily fail because, if this is during boot, we will hang
3097 * when freeing any successfully started taskqueues because
3098 * the scheduler isn't up yet.
3099 *
3100 * Most drivers just ignore the return value - it only fails
3101 * with ENOMEM so an error is not likely.
3102 */
3103 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
3104 rxq = &sc->vtnet_rxqs[i];
3105 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET,
3106 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id);
3107 if (error) {
3108 device_printf(dev, "failed to start rx taskq %d\n",
3109 rxq->vtnrx_id);
3110 }
3111
3112 txq = &sc->vtnet_txqs[i];
3113 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET,
3114 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id);
3115 if (error) {
3116 device_printf(dev, "failed to start tx taskq %d\n",
3117 txq->vtntx_id);
3118 }
3119 }
3120 }
3121
3122 static void
vtnet_free_taskqueues(struct vtnet_softc * sc)3123 vtnet_free_taskqueues(struct vtnet_softc *sc)
3124 {
3125 struct vtnet_rxq *rxq;
3126 struct vtnet_txq *txq;
3127 int i;
3128
3129 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3130 rxq = &sc->vtnet_rxqs[i];
3131 if (rxq->vtnrx_tq != NULL) {
3132 taskqueue_free(rxq->vtnrx_tq);
3133 rxq->vtnrx_tq = NULL;
3134 }
3135
3136 txq = &sc->vtnet_txqs[i];
3137 if (txq->vtntx_tq != NULL) {
3138 taskqueue_free(txq->vtntx_tq);
3139 txq->vtntx_tq = NULL;
3140 }
3141 }
3142 }
3143
3144 static void
vtnet_drain_taskqueues(struct vtnet_softc * sc)3145 vtnet_drain_taskqueues(struct vtnet_softc *sc)
3146 {
3147 struct vtnet_rxq *rxq;
3148 struct vtnet_txq *txq;
3149 int i;
3150
3151 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3152 rxq = &sc->vtnet_rxqs[i];
3153 if (rxq->vtnrx_tq != NULL)
3154 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
3155
3156 txq = &sc->vtnet_txqs[i];
3157 if (txq->vtntx_tq != NULL) {
3158 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask);
3159 if (!VTNET_ALTQ_ENABLED)
3160 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask);
3161 }
3162 }
3163 }
3164
3165 static void
vtnet_drain_rxtx_queues(struct vtnet_softc * sc)3166 vtnet_drain_rxtx_queues(struct vtnet_softc *sc)
3167 {
3168 struct vtnet_rxq *rxq;
3169 struct vtnet_txq *txq;
3170 int i;
3171
3172 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3173 rxq = &sc->vtnet_rxqs[i];
3174 vtnet_rxq_free_mbufs(rxq);
3175
3176 txq = &sc->vtnet_txqs[i];
3177 vtnet_txq_free_mbufs(txq);
3178 }
3179 }
3180
3181 static void
vtnet_stop_rendezvous(struct vtnet_softc * sc)3182 vtnet_stop_rendezvous(struct vtnet_softc *sc)
3183 {
3184 struct vtnet_rxq *rxq;
3185 struct vtnet_txq *txq;
3186 int i;
3187
3188 VTNET_CORE_LOCK_ASSERT(sc);
3189
3190 /*
3191 * Lock and unlock the per-queue mutex so we known the stop
3192 * state is visible. Doing only the active queues should be
3193 * sufficient, but it does not cost much extra to do all the
3194 * queues.
3195 */
3196 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3197 rxq = &sc->vtnet_rxqs[i];
3198 VTNET_RXQ_LOCK(rxq);
3199 VTNET_RXQ_UNLOCK(rxq);
3200
3201 txq = &sc->vtnet_txqs[i];
3202 VTNET_TXQ_LOCK(txq);
3203 VTNET_TXQ_UNLOCK(txq);
3204 }
3205 }
3206
3207 static void
vtnet_stop(struct vtnet_softc * sc)3208 vtnet_stop(struct vtnet_softc *sc)
3209 {
3210 device_t dev;
3211 if_t ifp;
3212
3213 dev = sc->vtnet_dev;
3214 ifp = sc->vtnet_ifp;
3215
3216 VTNET_CORE_LOCK_ASSERT(sc);
3217
3218 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3219 sc->vtnet_link_active = 0;
3220 callout_stop(&sc->vtnet_tick_ch);
3221
3222 /* Only advisory. */
3223 vtnet_disable_interrupts(sc);
3224
3225 #ifdef DEV_NETMAP
3226 /* Stop any pending txsync/rxsync and disable them. */
3227 netmap_disable_all_rings(ifp);
3228 #endif /* DEV_NETMAP */
3229
3230 /*
3231 * Stop the host adapter. This resets it to the pre-initialized
3232 * state. It will not generate any interrupts until after it is
3233 * reinitialized.
3234 */
3235 virtio_stop(dev);
3236 vtnet_stop_rendezvous(sc);
3237
3238 vtnet_drain_rxtx_queues(sc);
3239 sc->vtnet_act_vq_pairs = 1;
3240 }
3241
3242 static int
vtnet_virtio_reinit(struct vtnet_softc * sc)3243 vtnet_virtio_reinit(struct vtnet_softc *sc)
3244 {
3245 device_t dev;
3246 if_t ifp;
3247 uint64_t features;
3248 int error;
3249
3250 dev = sc->vtnet_dev;
3251 ifp = sc->vtnet_ifp;
3252 features = sc->vtnet_negotiated_features;
3253
3254 /*
3255 * Re-negotiate with the host, removing any disabled receive
3256 * features. Transmit features are disabled only on our side
3257 * via if_capenable and if_hwassist.
3258 */
3259
3260 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0)
3261 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES);
3262
3263 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0)
3264 features &= ~VTNET_LRO_FEATURES;
3265
3266 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0)
3267 features &= ~VIRTIO_NET_F_CTRL_VLAN;
3268
3269 error = virtio_reinit(dev, features);
3270 if (error) {
3271 device_printf(dev, "virtio reinit error %d\n", error);
3272 return (error);
3273 }
3274
3275 sc->vtnet_features = features;
3276 virtio_reinit_complete(dev);
3277
3278 return (0);
3279 }
3280
3281 static void
vtnet_init_rx_filters(struct vtnet_softc * sc)3282 vtnet_init_rx_filters(struct vtnet_softc *sc)
3283 {
3284 if_t ifp;
3285
3286 ifp = sc->vtnet_ifp;
3287
3288 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
3289 vtnet_rx_filter(sc);
3290 vtnet_rx_filter_mac(sc);
3291 }
3292
3293 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER)
3294 vtnet_rx_filter_vlan(sc);
3295 }
3296
3297 static int
vtnet_init_rx_queues(struct vtnet_softc * sc)3298 vtnet_init_rx_queues(struct vtnet_softc *sc)
3299 {
3300 device_t dev;
3301 if_t ifp;
3302 struct vtnet_rxq *rxq;
3303 int i, clustersz, error;
3304
3305 dev = sc->vtnet_dev;
3306 ifp = sc->vtnet_ifp;
3307
3308 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp));
3309 sc->vtnet_rx_clustersz = clustersz;
3310
3311 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) {
3312 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) +
3313 VTNET_MAX_RX_SIZE, clustersz);
3314 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs,
3315 ("%s: too many rx mbufs %d for %d segments", __func__,
3316 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs));
3317 } else
3318 sc->vtnet_rx_nmbufs = 1;
3319
3320 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3321 rxq = &sc->vtnet_rxqs[i];
3322
3323 /* Hold the lock to satisfy asserts. */
3324 VTNET_RXQ_LOCK(rxq);
3325 error = vtnet_rxq_populate(rxq);
3326 VTNET_RXQ_UNLOCK(rxq);
3327
3328 if (error) {
3329 device_printf(dev, "cannot populate Rx queue %d\n", i);
3330 return (error);
3331 }
3332 }
3333
3334 return (0);
3335 }
3336
3337 static int
vtnet_init_tx_queues(struct vtnet_softc * sc)3338 vtnet_init_tx_queues(struct vtnet_softc *sc)
3339 {
3340 struct vtnet_txq *txq;
3341 int i;
3342
3343 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3344 txq = &sc->vtnet_txqs[i];
3345 txq->vtntx_watchdog = 0;
3346 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq);
3347 #ifdef DEV_NETMAP
3348 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0);
3349 #endif /* DEV_NETMAP */
3350 }
3351
3352 return (0);
3353 }
3354
3355 static int
vtnet_init_rxtx_queues(struct vtnet_softc * sc)3356 vtnet_init_rxtx_queues(struct vtnet_softc *sc)
3357 {
3358 int error;
3359
3360 error = vtnet_init_rx_queues(sc);
3361 if (error)
3362 return (error);
3363
3364 error = vtnet_init_tx_queues(sc);
3365 if (error)
3366 return (error);
3367
3368 return (0);
3369 }
3370
3371 static void
vtnet_set_active_vq_pairs(struct vtnet_softc * sc)3372 vtnet_set_active_vq_pairs(struct vtnet_softc *sc)
3373 {
3374 device_t dev;
3375 int npairs;
3376
3377 dev = sc->vtnet_dev;
3378
3379 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) {
3380 sc->vtnet_act_vq_pairs = 1;
3381 return;
3382 }
3383
3384 npairs = sc->vtnet_req_vq_pairs;
3385
3386 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) {
3387 device_printf(dev, "cannot set active queue pairs to %d, "
3388 "falling back to 1 queue pair\n", npairs);
3389 npairs = 1;
3390 }
3391
3392 sc->vtnet_act_vq_pairs = npairs;
3393 }
3394
3395 static void
vtnet_update_rx_offloads(struct vtnet_softc * sc)3396 vtnet_update_rx_offloads(struct vtnet_softc *sc)
3397 {
3398 if_t ifp;
3399 uint64_t features;
3400 int error;
3401
3402 ifp = sc->vtnet_ifp;
3403 features = sc->vtnet_features;
3404
3405 VTNET_CORE_LOCK_ASSERT(sc);
3406
3407 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
3408 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6))
3409 features |= VIRTIO_NET_F_GUEST_CSUM;
3410 else
3411 features &= ~VIRTIO_NET_F_GUEST_CSUM;
3412 }
3413
3414 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) {
3415 if (if_getcapenable(ifp) & IFCAP_LRO)
3416 features |= VTNET_LRO_FEATURES;
3417 else
3418 features &= ~VTNET_LRO_FEATURES;
3419 }
3420
3421 error = vtnet_ctrl_guest_offloads(sc,
3422 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 |
3423 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN |
3424 VIRTIO_NET_F_GUEST_UFO));
3425 if (error) {
3426 device_printf(sc->vtnet_dev,
3427 "%s: cannot update Rx features\n", __func__);
3428 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
3429 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3430 vtnet_init_locked(sc, 0);
3431 }
3432 } else
3433 sc->vtnet_features = features;
3434 }
3435
3436 static int
vtnet_reinit(struct vtnet_softc * sc)3437 vtnet_reinit(struct vtnet_softc *sc)
3438 {
3439 if_t ifp;
3440 int error;
3441
3442 ifp = sc->vtnet_ifp;
3443
3444 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN);
3445
3446 error = vtnet_virtio_reinit(sc);
3447 if (error)
3448 return (error);
3449
3450 vtnet_set_macaddr(sc);
3451 vtnet_set_active_vq_pairs(sc);
3452
3453 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
3454 vtnet_init_rx_filters(sc);
3455
3456 if_sethwassist(ifp, 0);
3457 if (if_getcapenable(ifp) & IFCAP_TXCSUM)
3458 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0);
3459 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6)
3460 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0);
3461 if (if_getcapenable(ifp) & IFCAP_TSO4)
3462 if_sethwassistbits(ifp, CSUM_IP_TSO, 0);
3463 if (if_getcapenable(ifp) & IFCAP_TSO6)
3464 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0);
3465
3466 error = vtnet_init_rxtx_queues(sc);
3467 if (error)
3468 return (error);
3469
3470 return (0);
3471 }
3472
3473 static void
vtnet_init_locked(struct vtnet_softc * sc,int init_mode)3474 vtnet_init_locked(struct vtnet_softc *sc, int init_mode)
3475 {
3476 if_t ifp;
3477
3478 ifp = sc->vtnet_ifp;
3479
3480 VTNET_CORE_LOCK_ASSERT(sc);
3481
3482 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
3483 return;
3484
3485 vtnet_stop(sc);
3486
3487 #ifdef DEV_NETMAP
3488 /* Once stopped we can update the netmap flags, if necessary. */
3489 switch (init_mode) {
3490 case VTNET_INIT_NETMAP_ENTER:
3491 nm_set_native_flags(NA(ifp));
3492 break;
3493 case VTNET_INIT_NETMAP_EXIT:
3494 nm_clear_native_flags(NA(ifp));
3495 break;
3496 }
3497 #endif /* DEV_NETMAP */
3498
3499 if (vtnet_reinit(sc) != 0) {
3500 vtnet_stop(sc);
3501 return;
3502 }
3503
3504 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0);
3505 vtnet_update_link_status(sc);
3506 vtnet_enable_interrupts(sc);
3507 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
3508
3509 #ifdef DEV_NETMAP
3510 /* Re-enable txsync/rxsync. */
3511 netmap_enable_all_rings(ifp);
3512 #endif /* DEV_NETMAP */
3513 }
3514
3515 static void
vtnet_init(void * xsc)3516 vtnet_init(void *xsc)
3517 {
3518 struct vtnet_softc *sc;
3519
3520 sc = xsc;
3521
3522 VTNET_CORE_LOCK(sc);
3523 vtnet_init_locked(sc, 0);
3524 VTNET_CORE_UNLOCK(sc);
3525 }
3526
3527 static void
vtnet_free_ctrl_vq(struct vtnet_softc * sc)3528 vtnet_free_ctrl_vq(struct vtnet_softc *sc)
3529 {
3530
3531 /*
3532 * The control virtqueue is only polled and therefore it should
3533 * already be empty.
3534 */
3535 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq),
3536 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq));
3537 }
3538
3539 static void
vtnet_exec_ctrl_cmd(struct vtnet_softc * sc,void * cookie,struct sglist * sg,int readable,int writable)3540 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie,
3541 struct sglist *sg, int readable, int writable)
3542 {
3543 struct virtqueue *vq;
3544
3545 vq = sc->vtnet_ctrl_vq;
3546
3547 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ);
3548 VTNET_CORE_LOCK_ASSERT(sc);
3549
3550 if (!virtqueue_empty(vq))
3551 return;
3552
3553 /*
3554 * Poll for the response, but the command is likely completed before
3555 * returning from the notify.
3556 */
3557 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) {
3558 virtqueue_notify(vq);
3559 virtqueue_poll(vq, NULL);
3560 }
3561 }
3562
3563 static int
vtnet_ctrl_mac_cmd(struct vtnet_softc * sc,uint8_t * hwaddr)3564 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr)
3565 {
3566 struct sglist_seg segs[3];
3567 struct sglist sg;
3568 struct {
3569 struct virtio_net_ctrl_hdr hdr __aligned(2);
3570 uint8_t pad1;
3571 uint8_t addr[ETHER_ADDR_LEN] __aligned(8);
3572 uint8_t pad2;
3573 uint8_t ack;
3574 } s;
3575 int error;
3576
3577 error = 0;
3578 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC);
3579
3580 s.hdr.class = VIRTIO_NET_CTRL_MAC;
3581 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
3582 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN);
3583 s.ack = VIRTIO_NET_ERR;
3584
3585 sglist_init(&sg, nitems(segs), segs);
3586 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3587 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN);
3588 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3589 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3590
3591 if (error == 0)
3592 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3593
3594 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3595 }
3596
3597 static int
vtnet_ctrl_guest_offloads(struct vtnet_softc * sc,uint64_t offloads)3598 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads)
3599 {
3600 struct sglist_seg segs[3];
3601 struct sglist sg;
3602 struct {
3603 struct virtio_net_ctrl_hdr hdr __aligned(2);
3604 uint8_t pad1;
3605 uint64_t offloads __aligned(8);
3606 uint8_t pad2;
3607 uint8_t ack;
3608 } s;
3609 int error;
3610
3611 error = 0;
3612 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
3613
3614 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS;
3615 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET;
3616 s.offloads = vtnet_gtoh64(sc, offloads);
3617 s.ack = VIRTIO_NET_ERR;
3618
3619 sglist_init(&sg, nitems(segs), segs);
3620 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3621 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t));
3622 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3623 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3624
3625 if (error == 0)
3626 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3627
3628 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3629 }
3630
3631 static int
vtnet_ctrl_mq_cmd(struct vtnet_softc * sc,uint16_t npairs)3632 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs)
3633 {
3634 struct sglist_seg segs[3];
3635 struct sglist sg;
3636 struct {
3637 struct virtio_net_ctrl_hdr hdr __aligned(2);
3638 uint8_t pad1;
3639 struct virtio_net_ctrl_mq mq __aligned(2);
3640 uint8_t pad2;
3641 uint8_t ack;
3642 } s;
3643 int error;
3644
3645 error = 0;
3646 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ);
3647
3648 s.hdr.class = VIRTIO_NET_CTRL_MQ;
3649 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
3650 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs);
3651 s.ack = VIRTIO_NET_ERR;
3652
3653 sglist_init(&sg, nitems(segs), segs);
3654 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3655 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq));
3656 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3657 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3658
3659 if (error == 0)
3660 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3661
3662 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3663 }
3664
3665 static int
vtnet_ctrl_rx_cmd(struct vtnet_softc * sc,uint8_t cmd,bool on)3666 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on)
3667 {
3668 struct sglist_seg segs[3];
3669 struct sglist sg;
3670 struct {
3671 struct virtio_net_ctrl_hdr hdr __aligned(2);
3672 uint8_t pad1;
3673 uint8_t onoff;
3674 uint8_t pad2;
3675 uint8_t ack;
3676 } s;
3677 int error;
3678
3679 error = 0;
3680 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3681
3682 s.hdr.class = VIRTIO_NET_CTRL_RX;
3683 s.hdr.cmd = cmd;
3684 s.onoff = on;
3685 s.ack = VIRTIO_NET_ERR;
3686
3687 sglist_init(&sg, nitems(segs), segs);
3688 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3689 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t));
3690 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3691 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3692
3693 if (error == 0)
3694 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3695
3696 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3697 }
3698
3699 static int
vtnet_set_promisc(struct vtnet_softc * sc,bool on)3700 vtnet_set_promisc(struct vtnet_softc *sc, bool on)
3701 {
3702 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on));
3703 }
3704
3705 static int
vtnet_set_allmulti(struct vtnet_softc * sc,bool on)3706 vtnet_set_allmulti(struct vtnet_softc *sc, bool on)
3707 {
3708 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on));
3709 }
3710
3711 static void
vtnet_rx_filter(struct vtnet_softc * sc)3712 vtnet_rx_filter(struct vtnet_softc *sc)
3713 {
3714 device_t dev;
3715 if_t ifp;
3716
3717 dev = sc->vtnet_dev;
3718 ifp = sc->vtnet_ifp;
3719
3720 VTNET_CORE_LOCK_ASSERT(sc);
3721
3722 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) {
3723 device_printf(dev, "cannot %s promiscuous mode\n",
3724 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable");
3725 }
3726
3727 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) {
3728 device_printf(dev, "cannot %s all-multicast mode\n",
3729 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable");
3730 }
3731 }
3732
3733 static u_int
vtnet_copy_ifaddr(void * arg,struct sockaddr_dl * sdl,u_int ucnt)3734 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt)
3735 {
3736 struct vtnet_softc *sc = arg;
3737
3738 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0)
3739 return (0);
3740
3741 if (ucnt < VTNET_MAX_MAC_ENTRIES)
3742 bcopy(LLADDR(sdl),
3743 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt],
3744 ETHER_ADDR_LEN);
3745
3746 return (1);
3747 }
3748
3749 static u_int
vtnet_copy_maddr(void * arg,struct sockaddr_dl * sdl,u_int mcnt)3750 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt)
3751 {
3752 struct vtnet_mac_filter *filter = arg;
3753
3754 if (mcnt < VTNET_MAX_MAC_ENTRIES)
3755 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt],
3756 ETHER_ADDR_LEN);
3757
3758 return (1);
3759 }
3760
3761 static void
vtnet_rx_filter_mac(struct vtnet_softc * sc)3762 vtnet_rx_filter_mac(struct vtnet_softc *sc)
3763 {
3764 struct virtio_net_ctrl_hdr hdr __aligned(2);
3765 struct vtnet_mac_filter *filter;
3766 struct sglist_seg segs[4];
3767 struct sglist sg;
3768 if_t ifp;
3769 bool promisc, allmulti;
3770 u_int ucnt, mcnt;
3771 int error;
3772 uint8_t ack;
3773
3774 ifp = sc->vtnet_ifp;
3775 filter = sc->vtnet_mac_filter;
3776 error = 0;
3777
3778 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3779 VTNET_CORE_LOCK_ASSERT(sc);
3780
3781 /* Unicast MAC addresses: */
3782 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc);
3783 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES);
3784
3785 if (promisc) {
3786 ucnt = 0;
3787 if_printf(ifp, "more than %d MAC addresses assigned, "
3788 "falling back to promiscuous mode\n",
3789 VTNET_MAX_MAC_ENTRIES);
3790 }
3791
3792 /* Multicast MAC addresses: */
3793 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter);
3794 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES);
3795
3796 if (allmulti) {
3797 mcnt = 0;
3798 if_printf(ifp, "more than %d multicast MAC addresses "
3799 "assigned, falling back to all-multicast mode\n",
3800 VTNET_MAX_MAC_ENTRIES);
3801 }
3802
3803 if (promisc && allmulti)
3804 goto out;
3805
3806 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt);
3807 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt);
3808
3809 hdr.class = VIRTIO_NET_CTRL_MAC;
3810 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
3811 ack = VIRTIO_NET_ERR;
3812
3813 sglist_init(&sg, nitems(segs), segs);
3814 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr));
3815 error |= sglist_append(&sg, &filter->vmf_unicast,
3816 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN);
3817 error |= sglist_append(&sg, &filter->vmf_multicast,
3818 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN);
3819 error |= sglist_append(&sg, &ack, sizeof(uint8_t));
3820 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3821
3822 if (error == 0)
3823 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1);
3824 if (ack != VIRTIO_NET_OK)
3825 if_printf(ifp, "error setting host MAC filter table\n");
3826
3827 out:
3828 if (promisc && vtnet_set_promisc(sc, true) != 0)
3829 if_printf(ifp, "cannot enable promiscuous mode\n");
3830 if (allmulti && vtnet_set_allmulti(sc, true) != 0)
3831 if_printf(ifp, "cannot enable all-multicast mode\n");
3832 }
3833
3834 static int
vtnet_exec_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3835 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3836 {
3837 struct sglist_seg segs[3];
3838 struct sglist sg;
3839 struct {
3840 struct virtio_net_ctrl_hdr hdr __aligned(2);
3841 uint8_t pad1;
3842 uint16_t tag __aligned(2);
3843 uint8_t pad2;
3844 uint8_t ack;
3845 } s;
3846 int error;
3847
3848 error = 0;
3849 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3850
3851 s.hdr.class = VIRTIO_NET_CTRL_VLAN;
3852 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
3853 s.tag = vtnet_gtoh16(sc, tag);
3854 s.ack = VIRTIO_NET_ERR;
3855
3856 sglist_init(&sg, nitems(segs), segs);
3857 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3858 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t));
3859 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3860 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3861
3862 if (error == 0)
3863 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3864
3865 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3866 }
3867
3868 static void
vtnet_rx_filter_vlan(struct vtnet_softc * sc)3869 vtnet_rx_filter_vlan(struct vtnet_softc *sc)
3870 {
3871 int i, bit;
3872 uint32_t w;
3873 uint16_t tag;
3874
3875 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3876 VTNET_CORE_LOCK_ASSERT(sc);
3877
3878 /* Enable the filter for each configured VLAN. */
3879 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) {
3880 w = sc->vtnet_vlan_filter[i];
3881
3882 while ((bit = ffs(w) - 1) != -1) {
3883 w &= ~(1 << bit);
3884 tag = sizeof(w) * CHAR_BIT * i + bit;
3885
3886 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) {
3887 device_printf(sc->vtnet_dev,
3888 "cannot enable VLAN %d filter\n", tag);
3889 }
3890 }
3891 }
3892 }
3893
3894 static void
vtnet_update_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3895 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3896 {
3897 if_t ifp;
3898 int idx, bit;
3899
3900 ifp = sc->vtnet_ifp;
3901 idx = (tag >> 5) & 0x7F;
3902 bit = tag & 0x1F;
3903
3904 if (tag == 0 || tag > 4095)
3905 return;
3906
3907 VTNET_CORE_LOCK(sc);
3908
3909 if (add)
3910 sc->vtnet_vlan_filter[idx] |= (1 << bit);
3911 else
3912 sc->vtnet_vlan_filter[idx] &= ~(1 << bit);
3913
3914 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER &&
3915 if_getdrvflags(ifp) & IFF_DRV_RUNNING &&
3916 vtnet_exec_vlan_filter(sc, add, tag) != 0) {
3917 device_printf(sc->vtnet_dev,
3918 "cannot %s VLAN %d %s the host filter table\n",
3919 add ? "add" : "remove", tag, add ? "to" : "from");
3920 }
3921
3922 VTNET_CORE_UNLOCK(sc);
3923 }
3924
3925 static void
vtnet_register_vlan(void * arg,if_t ifp,uint16_t tag)3926 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag)
3927 {
3928
3929 if (if_getsoftc(ifp) != arg)
3930 return;
3931
3932 vtnet_update_vlan_filter(arg, 1, tag);
3933 }
3934
3935 static void
vtnet_unregister_vlan(void * arg,if_t ifp,uint16_t tag)3936 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag)
3937 {
3938
3939 if (if_getsoftc(ifp) != arg)
3940 return;
3941
3942 vtnet_update_vlan_filter(arg, 0, tag);
3943 }
3944
3945 static void
vtnet_update_speed_duplex(struct vtnet_softc * sc)3946 vtnet_update_speed_duplex(struct vtnet_softc *sc)
3947 {
3948 if_t ifp;
3949 uint32_t speed;
3950
3951 ifp = sc->vtnet_ifp;
3952
3953 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0)
3954 return;
3955
3956 /* BMV: Ignore duplex. */
3957 speed = virtio_read_dev_config_4(sc->vtnet_dev,
3958 offsetof(struct virtio_net_config, speed));
3959 if (speed != UINT32_MAX)
3960 if_setbaudrate(ifp, IF_Mbps(speed));
3961 }
3962
3963 static int
vtnet_is_link_up(struct vtnet_softc * sc)3964 vtnet_is_link_up(struct vtnet_softc *sc)
3965 {
3966 uint16_t status;
3967
3968 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0)
3969 return (1);
3970
3971 status = virtio_read_dev_config_2(sc->vtnet_dev,
3972 offsetof(struct virtio_net_config, status));
3973
3974 return ((status & VIRTIO_NET_S_LINK_UP) != 0);
3975 }
3976
3977 static void
vtnet_update_link_status(struct vtnet_softc * sc)3978 vtnet_update_link_status(struct vtnet_softc *sc)
3979 {
3980 if_t ifp;
3981 int link;
3982
3983 ifp = sc->vtnet_ifp;
3984 VTNET_CORE_LOCK_ASSERT(sc);
3985 link = vtnet_is_link_up(sc);
3986
3987 /* Notify if the link status has changed. */
3988 if (link != 0 && sc->vtnet_link_active == 0) {
3989 vtnet_update_speed_duplex(sc);
3990 sc->vtnet_link_active = 1;
3991 if_link_state_change(ifp, LINK_STATE_UP);
3992 } else if (link == 0 && sc->vtnet_link_active != 0) {
3993 sc->vtnet_link_active = 0;
3994 if_link_state_change(ifp, LINK_STATE_DOWN);
3995 }
3996 }
3997
3998 static int
vtnet_ifmedia_upd(if_t ifp __unused)3999 vtnet_ifmedia_upd(if_t ifp __unused)
4000 {
4001 return (EOPNOTSUPP);
4002 }
4003
4004 static void
vtnet_ifmedia_sts(if_t ifp,struct ifmediareq * ifmr)4005 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr)
4006 {
4007 struct vtnet_softc *sc;
4008
4009 sc = if_getsoftc(ifp);
4010
4011 ifmr->ifm_status = IFM_AVALID;
4012 ifmr->ifm_active = IFM_ETHER;
4013
4014 VTNET_CORE_LOCK(sc);
4015 if (vtnet_is_link_up(sc) != 0) {
4016 ifmr->ifm_status |= IFM_ACTIVE;
4017 ifmr->ifm_active |= IFM_10G_T | IFM_FDX;
4018 } else
4019 ifmr->ifm_active |= IFM_NONE;
4020 VTNET_CORE_UNLOCK(sc);
4021 }
4022
4023 static void
vtnet_get_macaddr(struct vtnet_softc * sc)4024 vtnet_get_macaddr(struct vtnet_softc *sc)
4025 {
4026
4027 if (sc->vtnet_flags & VTNET_FLAG_MAC) {
4028 virtio_read_device_config_array(sc->vtnet_dev,
4029 offsetof(struct virtio_net_config, mac),
4030 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN);
4031 } else {
4032 /* Generate a random locally administered unicast address. */
4033 sc->vtnet_hwaddr[0] = 0xB2;
4034 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0);
4035 }
4036 }
4037
4038 static void
vtnet_set_macaddr(struct vtnet_softc * sc)4039 vtnet_set_macaddr(struct vtnet_softc *sc)
4040 {
4041 device_t dev;
4042 int error;
4043
4044 dev = sc->vtnet_dev;
4045
4046 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) {
4047 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr);
4048 if (error)
4049 device_printf(dev, "unable to set MAC address\n");
4050 return;
4051 }
4052
4053 /* MAC in config is read-only in modern VirtIO. */
4054 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) {
4055 for (int i = 0; i < ETHER_ADDR_LEN; i++) {
4056 virtio_write_dev_config_1(dev,
4057 offsetof(struct virtio_net_config, mac) + i,
4058 sc->vtnet_hwaddr[i]);
4059 }
4060 }
4061 }
4062
4063 static void
vtnet_attached_set_macaddr(struct vtnet_softc * sc)4064 vtnet_attached_set_macaddr(struct vtnet_softc *sc)
4065 {
4066
4067 /* Assign MAC address if it was generated. */
4068 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0)
4069 vtnet_set_macaddr(sc);
4070 }
4071
4072 static void
vtnet_vlan_tag_remove(struct mbuf * m)4073 vtnet_vlan_tag_remove(struct mbuf *m)
4074 {
4075 struct ether_vlan_header *evh;
4076
4077 evh = mtod(m, struct ether_vlan_header *);
4078 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag);
4079 m->m_flags |= M_VLANTAG;
4080
4081 /* Strip the 802.1Q header. */
4082 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN,
4083 ETHER_HDR_LEN - ETHER_TYPE_LEN);
4084 m_adj(m, ETHER_VLAN_ENCAP_LEN);
4085 }
4086
4087 static void
vtnet_set_rx_process_limit(struct vtnet_softc * sc)4088 vtnet_set_rx_process_limit(struct vtnet_softc *sc)
4089 {
4090 int limit;
4091
4092 limit = vtnet_tunable_int(sc, "rx_process_limit",
4093 vtnet_rx_process_limit);
4094 if (limit < 0)
4095 limit = INT_MAX;
4096 sc->vtnet_rx_process_limit = limit;
4097 }
4098
4099 static void
vtnet_setup_rxq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_rxq * rxq)4100 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx,
4101 struct sysctl_oid_list *child, struct vtnet_rxq *rxq)
4102 {
4103 struct sysctl_oid *node;
4104 struct sysctl_oid_list *list;
4105 struct vtnet_rxq_stats *stats;
4106 char namebuf[16];
4107
4108 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id);
4109 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4110 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue");
4111 list = SYSCTL_CHILDREN(node);
4112
4113 stats = &rxq->vtnrx_stats;
4114
4115 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets",
4116 CTLFLAG_RD | CTLFLAG_STATS,
4117 &stats->vrxs_ipackets, "Receive packets");
4118 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes",
4119 CTLFLAG_RD | CTLFLAG_STATS,
4120 &stats->vrxs_ibytes, "Receive bytes");
4121 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops",
4122 CTLFLAG_RD | CTLFLAG_STATS,
4123 &stats->vrxs_iqdrops, "Receive drops");
4124 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors",
4125 CTLFLAG_RD | CTLFLAG_STATS,
4126 &stats->vrxs_ierrors, "Receive errors");
4127 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum",
4128 CTLFLAG_RD | CTLFLAG_STATS,
4129 &stats->vrxs_csum, "Receive checksum offloaded");
4130 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed",
4131 CTLFLAG_RD | CTLFLAG_STATS,
4132 &stats->vrxs_csum_failed, "Receive checksum offload failed");
4133 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro",
4134 CTLFLAG_RD | CTLFLAG_STATS,
4135 &stats->vrxs_host_lro, "Receive host segmentation offloaded");
4136 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled",
4137 CTLFLAG_RD | CTLFLAG_STATS,
4138 &stats->vrxs_rescheduled,
4139 "Receive interrupt handler rescheduled");
4140 }
4141
4142 static void
vtnet_setup_txq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_txq * txq)4143 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx,
4144 struct sysctl_oid_list *child, struct vtnet_txq *txq)
4145 {
4146 struct sysctl_oid *node;
4147 struct sysctl_oid_list *list;
4148 struct vtnet_txq_stats *stats;
4149 char namebuf[16];
4150
4151 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id);
4152 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4153 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue");
4154 list = SYSCTL_CHILDREN(node);
4155
4156 stats = &txq->vtntx_stats;
4157
4158 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets",
4159 CTLFLAG_RD | CTLFLAG_STATS,
4160 &stats->vtxs_opackets, "Transmit packets");
4161 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes",
4162 CTLFLAG_RD | CTLFLAG_STATS,
4163 &stats->vtxs_obytes, "Transmit bytes");
4164 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts",
4165 CTLFLAG_RD | CTLFLAG_STATS,
4166 &stats->vtxs_omcasts, "Transmit multicasts");
4167 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum",
4168 CTLFLAG_RD | CTLFLAG_STATS,
4169 &stats->vtxs_csum, "Transmit checksum offloaded");
4170 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso",
4171 CTLFLAG_RD | CTLFLAG_STATS,
4172 &stats->vtxs_tso, "Transmit TCP segmentation offloaded");
4173 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled",
4174 CTLFLAG_RD | CTLFLAG_STATS,
4175 &stats->vtxs_rescheduled,
4176 "Transmit interrupt handler rescheduled");
4177 }
4178
4179 static void
vtnet_setup_queue_sysctl(struct vtnet_softc * sc)4180 vtnet_setup_queue_sysctl(struct vtnet_softc *sc)
4181 {
4182 device_t dev;
4183 struct sysctl_ctx_list *ctx;
4184 struct sysctl_oid *tree;
4185 struct sysctl_oid_list *child;
4186 int i;
4187
4188 dev = sc->vtnet_dev;
4189 ctx = device_get_sysctl_ctx(dev);
4190 tree = device_get_sysctl_tree(dev);
4191 child = SYSCTL_CHILDREN(tree);
4192
4193 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
4194 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]);
4195 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]);
4196 }
4197 }
4198
4199 static int
vtnet_sysctl_rx_csum_failed(SYSCTL_HANDLER_ARGS)4200 vtnet_sysctl_rx_csum_failed(SYSCTL_HANDLER_ARGS)
4201 {
4202 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4203 struct vtnet_statistics *stats = &sc->vtnet_stats;
4204 struct vtnet_rxq_stats *rxst;
4205 int i;
4206
4207 stats->rx_csum_failed = 0;
4208 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4209 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
4210 stats->rx_csum_failed += rxst->vrxs_csum_failed;
4211 }
4212 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_failed, req));
4213 }
4214
4215 static int
vtnet_sysctl_rx_csum_offloaded(SYSCTL_HANDLER_ARGS)4216 vtnet_sysctl_rx_csum_offloaded(SYSCTL_HANDLER_ARGS)
4217 {
4218 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4219 struct vtnet_statistics *stats = &sc->vtnet_stats;
4220 struct vtnet_rxq_stats *rxst;
4221 int i;
4222
4223 stats->rx_csum_offloaded = 0;
4224 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4225 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
4226 stats->rx_csum_offloaded += rxst->vrxs_csum;
4227 }
4228 return (sysctl_handle_64(oidp, NULL, stats->rx_csum_offloaded, req));
4229 }
4230
4231 static int
vtnet_sysctl_rx_task_rescheduled(SYSCTL_HANDLER_ARGS)4232 vtnet_sysctl_rx_task_rescheduled(SYSCTL_HANDLER_ARGS)
4233 {
4234 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4235 struct vtnet_statistics *stats = &sc->vtnet_stats;
4236 struct vtnet_rxq_stats *rxst;
4237 int i;
4238
4239 stats->rx_task_rescheduled = 0;
4240 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4241 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
4242 stats->rx_task_rescheduled += rxst->vrxs_rescheduled;
4243 }
4244 return (sysctl_handle_64(oidp, NULL, stats->rx_task_rescheduled, req));
4245 }
4246
4247 static int
vtnet_sysctl_tx_csum_offloaded(SYSCTL_HANDLER_ARGS)4248 vtnet_sysctl_tx_csum_offloaded(SYSCTL_HANDLER_ARGS)
4249 {
4250 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4251 struct vtnet_statistics *stats = &sc->vtnet_stats;
4252 struct vtnet_txq_stats *txst;
4253 int i;
4254
4255 stats->tx_csum_offloaded = 0;
4256 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4257 txst = &sc->vtnet_txqs[i].vtntx_stats;
4258 stats->tx_csum_offloaded += txst->vtxs_csum;
4259 }
4260 return (sysctl_handle_64(oidp, NULL, stats->tx_csum_offloaded, req));
4261 }
4262
4263 static int
vtnet_sysctl_tx_tso_offloaded(SYSCTL_HANDLER_ARGS)4264 vtnet_sysctl_tx_tso_offloaded(SYSCTL_HANDLER_ARGS)
4265 {
4266 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4267 struct vtnet_statistics *stats = &sc->vtnet_stats;
4268 struct vtnet_txq_stats *txst;
4269 int i;
4270
4271 stats->tx_tso_offloaded = 0;
4272 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4273 txst = &sc->vtnet_txqs[i].vtntx_stats;
4274 stats->tx_tso_offloaded += txst->vtxs_tso;
4275 }
4276 return (sysctl_handle_64(oidp, NULL, stats->tx_tso_offloaded, req));
4277 }
4278
4279 static int
vtnet_sysctl_tx_task_rescheduled(SYSCTL_HANDLER_ARGS)4280 vtnet_sysctl_tx_task_rescheduled(SYSCTL_HANDLER_ARGS)
4281 {
4282 struct vtnet_softc *sc = (struct vtnet_softc *)arg1;
4283 struct vtnet_statistics *stats = &sc->vtnet_stats;
4284 struct vtnet_txq_stats *txst;
4285 int i;
4286
4287 stats->tx_task_rescheduled = 0;
4288 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
4289 txst = &sc->vtnet_txqs[i].vtntx_stats;
4290 stats->tx_task_rescheduled += txst->vtxs_rescheduled;
4291 }
4292 return (sysctl_handle_64(oidp, NULL, stats->tx_task_rescheduled, req));
4293 }
4294
4295 static void
vtnet_setup_stat_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_softc * sc)4296 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx,
4297 struct sysctl_oid_list *child, struct vtnet_softc *sc)
4298 {
4299 struct vtnet_statistics *stats;
4300 struct vtnet_rxq_stats rxaccum;
4301 struct vtnet_txq_stats txaccum;
4302
4303 vtnet_accum_stats(sc, &rxaccum, &txaccum);
4304
4305 stats = &sc->vtnet_stats;
4306 stats->rx_csum_offloaded = rxaccum.vrxs_csum;
4307 stats->rx_csum_failed = rxaccum.vrxs_csum_failed;
4308 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled;
4309 stats->tx_csum_offloaded = txaccum.vtxs_csum;
4310 stats->tx_tso_offloaded = txaccum.vtxs_tso;
4311 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled;
4312
4313 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed",
4314 CTLFLAG_RD | CTLFLAG_STATS, &stats->mbuf_alloc_failed,
4315 "Mbuf cluster allocation failures");
4316
4317 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large",
4318 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_frame_too_large,
4319 "Received frame larger than the mbuf chain");
4320 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed",
4321 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_enq_replacement_failed,
4322 "Enqueuing the replacement receive mbuf failed");
4323 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed",
4324 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_mergeable_failed,
4325 "Mergeable buffers receive failures");
4326 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype",
4327 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ethtype,
4328 "Received checksum offloaded buffer with unsupported "
4329 "Ethernet type");
4330 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto",
4331 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_ipproto,
4332 "Received checksum offloaded buffer with incorrect IP protocol");
4333 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset",
4334 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_bad_offset,
4335 "Received checksum offloaded buffer with incorrect offset");
4336 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_inaccessible_ipproto",
4337 CTLFLAG_RD | CTLFLAG_STATS, &stats->rx_csum_inaccessible_ipproto,
4338 "Received checksum offloaded buffer with inaccessible IP protocol");
4339 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_failed",
4340 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4341 sc, 0, vtnet_sysctl_rx_csum_failed, "QU",
4342 "Received buffer checksum offload failed");
4343 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_csum_offloaded",
4344 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4345 sc, 0, vtnet_sysctl_rx_csum_offloaded, "QU",
4346 "Received buffer checksum offload succeeded");
4347 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_task_rescheduled",
4348 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4349 sc, 0, vtnet_sysctl_rx_task_rescheduled, "QU",
4350 "Times the receive interrupt task rescheduled itself");
4351
4352 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype",
4353 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_unknown_ethtype,
4354 "Aborted transmit of checksum offloaded buffer with unknown "
4355 "Ethernet type");
4356 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch",
4357 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_csum_proto_mismatch,
4358 "Aborted transmit of checksum offloaded buffer because mismatched "
4359 "protocols");
4360 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp",
4361 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_not_tcp,
4362 "Aborted transmit of TSO buffer with non TCP protocol");
4363 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum",
4364 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_tso_without_csum,
4365 "Aborted transmit of TSO buffer without TCP checksum offload");
4366 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged",
4367 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defragged,
4368 "Transmit mbufs defragged");
4369 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed",
4370 CTLFLAG_RD | CTLFLAG_STATS, &stats->tx_defrag_failed,
4371 "Aborted transmit of buffer because defrag failed");
4372 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_csum_offloaded",
4373 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4374 sc, 0, vtnet_sysctl_tx_csum_offloaded, "QU",
4375 "Offloaded checksum of transmitted buffer");
4376 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_tso_offloaded",
4377 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4378 sc, 0, vtnet_sysctl_tx_tso_offloaded, "QU",
4379 "Segmentation offload of transmitted buffer");
4380 SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tx_task_rescheduled",
4381 CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_STATS,
4382 sc, 0, vtnet_sysctl_tx_task_rescheduled, "QU",
4383 "Times the transmit interrupt task rescheduled itself");
4384 }
4385
4386 static void
vtnet_setup_sysctl(struct vtnet_softc * sc)4387 vtnet_setup_sysctl(struct vtnet_softc *sc)
4388 {
4389 device_t dev;
4390 struct sysctl_ctx_list *ctx;
4391 struct sysctl_oid *tree;
4392 struct sysctl_oid_list *child;
4393
4394 dev = sc->vtnet_dev;
4395 ctx = device_get_sysctl_ctx(dev);
4396 tree = device_get_sysctl_tree(dev);
4397 child = SYSCTL_CHILDREN(tree);
4398
4399 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs",
4400 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0,
4401 "Number of maximum supported virtqueue pairs");
4402 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs",
4403 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0,
4404 "Number of requested virtqueue pairs");
4405 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
4406 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,
4407 "Number of active virtqueue pairs");
4408
4409 vtnet_setup_stat_sysctl(ctx, child, sc);
4410 }
4411
4412 static void
vtnet_load_tunables(struct vtnet_softc * sc)4413 vtnet_load_tunables(struct vtnet_softc *sc)
4414 {
4415
4416 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc,
4417 "lro_entry_count", vtnet_lro_entry_count);
4418 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES)
4419 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES;
4420
4421 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc,
4422 "lro_mbufq_depth", vtnet_lro_mbufq_depth);
4423 }
4424
4425 static int
vtnet_rxq_enable_intr(struct vtnet_rxq * rxq)4426 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq)
4427 {
4428
4429 return (virtqueue_enable_intr(rxq->vtnrx_vq));
4430 }
4431
4432 static void
vtnet_rxq_disable_intr(struct vtnet_rxq * rxq)4433 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq)
4434 {
4435
4436 virtqueue_disable_intr(rxq->vtnrx_vq);
4437 }
4438
4439 static int
vtnet_txq_enable_intr(struct vtnet_txq * txq)4440 vtnet_txq_enable_intr(struct vtnet_txq *txq)
4441 {
4442 struct virtqueue *vq;
4443
4444 vq = txq->vtntx_vq;
4445
4446 if (vtnet_txq_below_threshold(txq) != 0)
4447 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG));
4448
4449 /*
4450 * The free count is above our threshold. Keep the Tx interrupt
4451 * disabled until the queue is fuller.
4452 */
4453 return (0);
4454 }
4455
4456 static void
vtnet_txq_disable_intr(struct vtnet_txq * txq)4457 vtnet_txq_disable_intr(struct vtnet_txq *txq)
4458 {
4459
4460 virtqueue_disable_intr(txq->vtntx_vq);
4461 }
4462
4463 static void
vtnet_enable_rx_interrupts(struct vtnet_softc * sc)4464 vtnet_enable_rx_interrupts(struct vtnet_softc *sc)
4465 {
4466 struct vtnet_rxq *rxq;
4467 int i;
4468
4469 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
4470 rxq = &sc->vtnet_rxqs[i];
4471 if (vtnet_rxq_enable_intr(rxq) != 0)
4472 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
4473 }
4474 }
4475
4476 static void
vtnet_enable_tx_interrupts(struct vtnet_softc * sc)4477 vtnet_enable_tx_interrupts(struct vtnet_softc *sc)
4478 {
4479 int i;
4480
4481 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4482 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]);
4483 }
4484
4485 static void
vtnet_enable_interrupts(struct vtnet_softc * sc)4486 vtnet_enable_interrupts(struct vtnet_softc *sc)
4487 {
4488
4489 vtnet_enable_rx_interrupts(sc);
4490 vtnet_enable_tx_interrupts(sc);
4491 }
4492
4493 static void
vtnet_disable_rx_interrupts(struct vtnet_softc * sc)4494 vtnet_disable_rx_interrupts(struct vtnet_softc *sc)
4495 {
4496 int i;
4497
4498 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4499 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]);
4500 }
4501
4502 static void
vtnet_disable_tx_interrupts(struct vtnet_softc * sc)4503 vtnet_disable_tx_interrupts(struct vtnet_softc *sc)
4504 {
4505 int i;
4506
4507 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4508 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]);
4509 }
4510
4511 static void
vtnet_disable_interrupts(struct vtnet_softc * sc)4512 vtnet_disable_interrupts(struct vtnet_softc *sc)
4513 {
4514
4515 vtnet_disable_rx_interrupts(sc);
4516 vtnet_disable_tx_interrupts(sc);
4517 }
4518
4519 static int
vtnet_tunable_int(struct vtnet_softc * sc,const char * knob,int def)4520 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def)
4521 {
4522 char path[64];
4523
4524 snprintf(path, sizeof(path),
4525 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob);
4526 TUNABLE_INT_FETCH(path, &def);
4527
4528 return (def);
4529 }
4530
4531 #ifdef DEBUGNET
4532 static void
vtnet_debugnet_init(if_t ifp,int * nrxr,int * ncl,int * clsize)4533 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize)
4534 {
4535 struct vtnet_softc *sc;
4536
4537 sc = if_getsoftc(ifp);
4538
4539 VTNET_CORE_LOCK(sc);
4540 *nrxr = sc->vtnet_req_vq_pairs;
4541 *ncl = DEBUGNET_MAX_IN_FLIGHT;
4542 *clsize = sc->vtnet_rx_clustersz;
4543 VTNET_CORE_UNLOCK(sc);
4544 }
4545
4546 static void
vtnet_debugnet_event(if_t ifp __unused,enum debugnet_ev event)4547 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event)
4548 {
4549 struct vtnet_softc *sc;
4550 static bool sw_lro_enabled = false;
4551
4552 /*
4553 * Disable software LRO, since it would require entering the network
4554 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll().
4555 */
4556 sc = if_getsoftc(ifp);
4557 switch (event) {
4558 case DEBUGNET_START:
4559 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0;
4560 if (sw_lro_enabled)
4561 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO;
4562 break;
4563 case DEBUGNET_END:
4564 if (sw_lro_enabled)
4565 sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
4566 break;
4567 }
4568 }
4569
4570 static int
vtnet_debugnet_transmit(if_t ifp,struct mbuf * m)4571 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m)
4572 {
4573 struct vtnet_softc *sc;
4574 struct vtnet_txq *txq;
4575 int error;
4576
4577 sc = if_getsoftc(ifp);
4578 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4579 IFF_DRV_RUNNING)
4580 return (EBUSY);
4581
4582 txq = &sc->vtnet_txqs[0];
4583 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE);
4584 if (error == 0)
4585 (void)vtnet_txq_notify(txq);
4586 return (error);
4587 }
4588
4589 static int
vtnet_debugnet_poll(if_t ifp,int count)4590 vtnet_debugnet_poll(if_t ifp, int count)
4591 {
4592 struct vtnet_softc *sc;
4593 int i;
4594
4595 sc = if_getsoftc(ifp);
4596 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4597 IFF_DRV_RUNNING)
4598 return (EBUSY);
4599
4600 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]);
4601 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4602 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]);
4603 return (0);
4604 }
4605 #endif /* DEBUGNET */
4606