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 <sys/param.h>
32 #include <sys/eventhandler.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/sockio.h>
36 #include <sys/malloc.h>
37 #include <sys/mbuf.h>
38 #include <sys/module.h>
39 #include <sys/msan.h>
40 #include <sys/socket.h>
41 #include <sys/sysctl.h>
42 #include <sys/random.h>
43 #include <sys/sglist.h>
44 #include <sys/lock.h>
45 #include <sys/mutex.h>
46 #include <sys/taskqueue.h>
47 #include <sys/smp.h>
48 #include <machine/smp.h>
49
50 #include <vm/uma.h>
51
52 #include <net/debugnet.h>
53 #include <net/ethernet.h>
54 #include <net/pfil.h>
55 #include <net/if.h>
56 #include <net/if_var.h>
57 #include <net/if_arp.h>
58 #include <net/if_dl.h>
59 #include <net/if_types.h>
60 #include <net/if_media.h>
61 #include <net/if_vlan_var.h>
62
63 #include <net/bpf.h>
64
65 #include <netinet/in_systm.h>
66 #include <netinet/in.h>
67 #include <netinet/ip.h>
68 #include <netinet/ip6.h>
69 #include <netinet6/ip6_var.h>
70 #include <netinet/udp.h>
71 #include <netinet/tcp.h>
72 #include <netinet/tcp_lro.h>
73
74 #include <machine/bus.h>
75 #include <machine/resource.h>
76 #include <sys/bus.h>
77 #include <sys/rman.h>
78
79 #include <dev/virtio/virtio.h>
80 #include <dev/virtio/virtqueue.h>
81 #include <dev/virtio/network/virtio_net.h>
82 #include <dev/virtio/network/if_vtnetvar.h>
83 #include "virtio_if.h"
84
85 #include "opt_inet.h"
86 #include "opt_inet6.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 static int vtnet_rxq_csum_needs_csum(struct vtnet_rxq *, struct mbuf *,
137 uint16_t, int, struct virtio_net_hdr *);
138 static int vtnet_rxq_csum_data_valid(struct vtnet_rxq *, struct mbuf *,
139 uint16_t, int, struct virtio_net_hdr *);
140 static int vtnet_rxq_csum(struct vtnet_rxq *, struct mbuf *,
141 struct virtio_net_hdr *);
142 static void vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *, int);
143 static void vtnet_rxq_discard_buf(struct vtnet_rxq *, struct mbuf *);
144 static int vtnet_rxq_merged_eof(struct vtnet_rxq *, struct mbuf *, int);
145 static void vtnet_rxq_input(struct vtnet_rxq *, struct mbuf *,
146 struct virtio_net_hdr *);
147 static int vtnet_rxq_eof(struct vtnet_rxq *);
148 static void vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries);
149 static void vtnet_rx_vq_intr(void *);
150 static void vtnet_rxq_tq_intr(void *, int);
151
152 static int vtnet_txq_intr_threshold(struct vtnet_txq *);
153 static int vtnet_txq_below_threshold(struct vtnet_txq *);
154 static int vtnet_txq_notify(struct vtnet_txq *);
155 static void vtnet_txq_free_mbufs(struct vtnet_txq *);
156 static int vtnet_txq_offload_ctx(struct vtnet_txq *, struct mbuf *,
157 int *, int *, int *);
158 static int vtnet_txq_offload_tso(struct vtnet_txq *, struct mbuf *, int,
159 int, struct virtio_net_hdr *);
160 static struct mbuf *
161 vtnet_txq_offload(struct vtnet_txq *, struct mbuf *,
162 struct virtio_net_hdr *);
163 static int vtnet_txq_enqueue_buf(struct vtnet_txq *, struct mbuf **,
164 struct vtnet_tx_header *);
165 static int vtnet_txq_encap(struct vtnet_txq *, struct mbuf **, int);
166 #ifdef VTNET_LEGACY_TX
167 static void vtnet_start_locked(struct vtnet_txq *, if_t);
168 static void vtnet_start(if_t);
169 #else
170 static int vtnet_txq_mq_start_locked(struct vtnet_txq *, struct mbuf *);
171 static int vtnet_txq_mq_start(if_t, struct mbuf *);
172 static void vtnet_txq_tq_deferred(void *, int);
173 #endif
174 static void vtnet_txq_start(struct vtnet_txq *);
175 static void vtnet_txq_tq_intr(void *, int);
176 static int vtnet_txq_eof(struct vtnet_txq *);
177 static void vtnet_tx_vq_intr(void *);
178 static void vtnet_tx_start_all(struct vtnet_softc *);
179
180 #ifndef VTNET_LEGACY_TX
181 static void vtnet_qflush(if_t);
182 #endif
183
184 static int vtnet_watchdog(struct vtnet_txq *);
185 static void vtnet_accum_stats(struct vtnet_softc *,
186 struct vtnet_rxq_stats *, struct vtnet_txq_stats *);
187 static void vtnet_tick(void *);
188
189 static void vtnet_start_taskqueues(struct vtnet_softc *);
190 static void vtnet_free_taskqueues(struct vtnet_softc *);
191 static void vtnet_drain_taskqueues(struct vtnet_softc *);
192
193 static void vtnet_drain_rxtx_queues(struct vtnet_softc *);
194 static void vtnet_stop_rendezvous(struct vtnet_softc *);
195 static void vtnet_stop(struct vtnet_softc *);
196 static int vtnet_virtio_reinit(struct vtnet_softc *);
197 static void vtnet_init_rx_filters(struct vtnet_softc *);
198 static int vtnet_init_rx_queues(struct vtnet_softc *);
199 static int vtnet_init_tx_queues(struct vtnet_softc *);
200 static int vtnet_init_rxtx_queues(struct vtnet_softc *);
201 static void vtnet_set_active_vq_pairs(struct vtnet_softc *);
202 static void vtnet_update_rx_offloads(struct vtnet_softc *);
203 static int vtnet_reinit(struct vtnet_softc *);
204 static void vtnet_init_locked(struct vtnet_softc *, int);
205 static void vtnet_init(void *);
206
207 static void vtnet_free_ctrl_vq(struct vtnet_softc *);
208 static void vtnet_exec_ctrl_cmd(struct vtnet_softc *, void *,
209 struct sglist *, int, int);
210 static int vtnet_ctrl_mac_cmd(struct vtnet_softc *, uint8_t *);
211 static int vtnet_ctrl_guest_offloads(struct vtnet_softc *, uint64_t);
212 static int vtnet_ctrl_mq_cmd(struct vtnet_softc *, uint16_t);
213 static int vtnet_ctrl_rx_cmd(struct vtnet_softc *, uint8_t, bool);
214 static int vtnet_set_promisc(struct vtnet_softc *, bool);
215 static int vtnet_set_allmulti(struct vtnet_softc *, bool);
216 static void vtnet_rx_filter(struct vtnet_softc *);
217 static void vtnet_rx_filter_mac(struct vtnet_softc *);
218 static int vtnet_exec_vlan_filter(struct vtnet_softc *, int, uint16_t);
219 static void vtnet_rx_filter_vlan(struct vtnet_softc *);
220 static void vtnet_update_vlan_filter(struct vtnet_softc *, int, uint16_t);
221 static void vtnet_register_vlan(void *, if_t, uint16_t);
222 static void vtnet_unregister_vlan(void *, if_t, uint16_t);
223
224 static void vtnet_update_speed_duplex(struct vtnet_softc *);
225 static int vtnet_is_link_up(struct vtnet_softc *);
226 static void vtnet_update_link_status(struct vtnet_softc *);
227 static int vtnet_ifmedia_upd(if_t);
228 static void vtnet_ifmedia_sts(if_t, struct ifmediareq *);
229 static void vtnet_get_macaddr(struct vtnet_softc *);
230 static void vtnet_set_macaddr(struct vtnet_softc *);
231 static void vtnet_attached_set_macaddr(struct vtnet_softc *);
232 static void vtnet_vlan_tag_remove(struct mbuf *);
233 static void vtnet_set_rx_process_limit(struct vtnet_softc *);
234
235 static void vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *,
236 struct sysctl_oid_list *, struct vtnet_rxq *);
237 static void vtnet_setup_txq_sysctl(struct sysctl_ctx_list *,
238 struct sysctl_oid_list *, struct vtnet_txq *);
239 static void vtnet_setup_queue_sysctl(struct vtnet_softc *);
240 static void vtnet_load_tunables(struct vtnet_softc *);
241 static void vtnet_setup_sysctl(struct vtnet_softc *);
242
243 static int vtnet_rxq_enable_intr(struct vtnet_rxq *);
244 static void vtnet_rxq_disable_intr(struct vtnet_rxq *);
245 static int vtnet_txq_enable_intr(struct vtnet_txq *);
246 static void vtnet_txq_disable_intr(struct vtnet_txq *);
247 static void vtnet_enable_rx_interrupts(struct vtnet_softc *);
248 static void vtnet_enable_tx_interrupts(struct vtnet_softc *);
249 static void vtnet_enable_interrupts(struct vtnet_softc *);
250 static void vtnet_disable_rx_interrupts(struct vtnet_softc *);
251 static void vtnet_disable_tx_interrupts(struct vtnet_softc *);
252 static void vtnet_disable_interrupts(struct vtnet_softc *);
253
254 static int vtnet_tunable_int(struct vtnet_softc *, const char *, int);
255
256 DEBUGNET_DEFINE(vtnet);
257
258 #define vtnet_htog16(_sc, _val) virtio_htog16(vtnet_modern(_sc), _val)
259 #define vtnet_htog32(_sc, _val) virtio_htog32(vtnet_modern(_sc), _val)
260 #define vtnet_htog64(_sc, _val) virtio_htog64(vtnet_modern(_sc), _val)
261 #define vtnet_gtoh16(_sc, _val) virtio_gtoh16(vtnet_modern(_sc), _val)
262 #define vtnet_gtoh32(_sc, _val) virtio_gtoh32(vtnet_modern(_sc), _val)
263 #define vtnet_gtoh64(_sc, _val) virtio_gtoh64(vtnet_modern(_sc), _val)
264
265 /* Tunables. */
266 static SYSCTL_NODE(_hw, OID_AUTO, vtnet, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
267 "VirtIO Net driver parameters");
268
269 static int vtnet_csum_disable = 0;
270 SYSCTL_INT(_hw_vtnet, OID_AUTO, csum_disable, CTLFLAG_RDTUN,
271 &vtnet_csum_disable, 0, "Disables receive and send checksum offload");
272
273 static int vtnet_fixup_needs_csum = 0;
274 SYSCTL_INT(_hw_vtnet, OID_AUTO, fixup_needs_csum, CTLFLAG_RDTUN,
275 &vtnet_fixup_needs_csum, 0,
276 "Calculate valid checksum for NEEDS_CSUM packets");
277
278 static int vtnet_tso_disable = 0;
279 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_disable, CTLFLAG_RDTUN,
280 &vtnet_tso_disable, 0, "Disables TSO");
281
282 static int vtnet_lro_disable = 0;
283 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_disable, CTLFLAG_RDTUN,
284 &vtnet_lro_disable, 0, "Disables hardware LRO");
285
286 static int vtnet_mq_disable = 0;
287 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_disable, CTLFLAG_RDTUN,
288 &vtnet_mq_disable, 0, "Disables multiqueue support");
289
290 static int vtnet_mq_max_pairs = VTNET_MAX_QUEUE_PAIRS;
291 SYSCTL_INT(_hw_vtnet, OID_AUTO, mq_max_pairs, CTLFLAG_RDTUN,
292 &vtnet_mq_max_pairs, 0, "Maximum number of multiqueue pairs");
293
294 static int vtnet_tso_maxlen = IP_MAXPACKET;
295 SYSCTL_INT(_hw_vtnet, OID_AUTO, tso_maxlen, CTLFLAG_RDTUN,
296 &vtnet_tso_maxlen, 0, "TSO burst limit");
297
298 static int vtnet_rx_process_limit = 1024;
299 SYSCTL_INT(_hw_vtnet, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN,
300 &vtnet_rx_process_limit, 0,
301 "Number of RX segments processed in one pass");
302
303 static int vtnet_lro_entry_count = 128;
304 SYSCTL_INT(_hw_vtnet, OID_AUTO, lro_entry_count, CTLFLAG_RDTUN,
305 &vtnet_lro_entry_count, 0, "Software LRO entry count");
306
307 /* Enable sorted LRO, and the depth of the mbuf queue. */
308 static int vtnet_lro_mbufq_depth = 0;
309 SYSCTL_UINT(_hw_vtnet, OID_AUTO, lro_mbufq_depth, CTLFLAG_RDTUN,
310 &vtnet_lro_mbufq_depth, 0, "Depth of software LRO mbuf queue");
311
312 static uma_zone_t vtnet_tx_header_zone;
313
314 static struct virtio_feature_desc vtnet_feature_desc[] = {
315 { VIRTIO_NET_F_CSUM, "TxChecksum" },
316 { VIRTIO_NET_F_GUEST_CSUM, "RxChecksum" },
317 { VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, "CtrlRxOffloads" },
318 { VIRTIO_NET_F_MAC, "MAC" },
319 { VIRTIO_NET_F_GSO, "TxGSO" },
320 { VIRTIO_NET_F_GUEST_TSO4, "RxLROv4" },
321 { VIRTIO_NET_F_GUEST_TSO6, "RxLROv6" },
322 { VIRTIO_NET_F_GUEST_ECN, "RxLROECN" },
323 { VIRTIO_NET_F_GUEST_UFO, "RxUFO" },
324 { VIRTIO_NET_F_HOST_TSO4, "TxTSOv4" },
325 { VIRTIO_NET_F_HOST_TSO6, "TxTSOv6" },
326 { VIRTIO_NET_F_HOST_ECN, "TxTSOECN" },
327 { VIRTIO_NET_F_HOST_UFO, "TxUFO" },
328 { VIRTIO_NET_F_MRG_RXBUF, "MrgRxBuf" },
329 { VIRTIO_NET_F_STATUS, "Status" },
330 { VIRTIO_NET_F_CTRL_VQ, "CtrlVq" },
331 { VIRTIO_NET_F_CTRL_RX, "CtrlRxMode" },
332 { VIRTIO_NET_F_CTRL_VLAN, "CtrlVLANFilter" },
333 { VIRTIO_NET_F_CTRL_RX_EXTRA, "CtrlRxModeExtra" },
334 { VIRTIO_NET_F_GUEST_ANNOUNCE, "GuestAnnounce" },
335 { VIRTIO_NET_F_MQ, "Multiqueue" },
336 { VIRTIO_NET_F_CTRL_MAC_ADDR, "CtrlMacAddr" },
337 { VIRTIO_NET_F_SPEED_DUPLEX, "SpeedDuplex" },
338
339 { 0, NULL }
340 };
341
342 static device_method_t vtnet_methods[] = {
343 /* Device methods. */
344 DEVMETHOD(device_probe, vtnet_probe),
345 DEVMETHOD(device_attach, vtnet_attach),
346 DEVMETHOD(device_detach, vtnet_detach),
347 DEVMETHOD(device_suspend, vtnet_suspend),
348 DEVMETHOD(device_resume, vtnet_resume),
349 DEVMETHOD(device_shutdown, vtnet_shutdown),
350
351 /* VirtIO methods. */
352 DEVMETHOD(virtio_attach_completed, vtnet_attach_completed),
353 DEVMETHOD(virtio_config_change, vtnet_config_change),
354
355 DEVMETHOD_END
356 };
357
358 #ifdef DEV_NETMAP
359 #include <dev/netmap/if_vtnet_netmap.h>
360 #endif
361
362 static driver_t vtnet_driver = {
363 .name = "vtnet",
364 .methods = vtnet_methods,
365 .size = sizeof(struct vtnet_softc)
366 };
367 VIRTIO_DRIVER_MODULE(vtnet, vtnet_driver, vtnet_modevent, NULL);
368 MODULE_VERSION(vtnet, 1);
369 MODULE_DEPEND(vtnet, virtio, 1, 1, 1);
370 #ifdef DEV_NETMAP
371 MODULE_DEPEND(vtnet, netmap, 1, 1, 1);
372 #endif
373
374 VIRTIO_SIMPLE_PNPINFO(vtnet, VIRTIO_ID_NETWORK, "VirtIO Networking Adapter");
375
376 static int
vtnet_modevent(module_t mod __unused,int type,void * unused __unused)377 vtnet_modevent(module_t mod __unused, int type, void *unused __unused)
378 {
379 int error = 0;
380 static int loaded = 0;
381
382 switch (type) {
383 case MOD_LOAD:
384 if (loaded++ == 0) {
385 vtnet_tx_header_zone = uma_zcreate("vtnet_tx_hdr",
386 sizeof(struct vtnet_tx_header),
387 NULL, NULL, NULL, NULL, 0, 0);
388 #ifdef DEBUGNET
389 /*
390 * We need to allocate from this zone in the transmit path, so ensure
391 * that we have at least one item per header available.
392 * XXX add a separate zone like we do for mbufs? otherwise we may alloc
393 * buckets
394 */
395 uma_zone_reserve(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
396 uma_prealloc(vtnet_tx_header_zone, DEBUGNET_MAX_IN_FLIGHT * 2);
397 #endif
398 }
399 break;
400 case MOD_QUIESCE:
401 if (uma_zone_get_cur(vtnet_tx_header_zone) > 0)
402 error = EBUSY;
403 break;
404 case MOD_UNLOAD:
405 if (--loaded == 0) {
406 uma_zdestroy(vtnet_tx_header_zone);
407 vtnet_tx_header_zone = NULL;
408 }
409 break;
410 case MOD_SHUTDOWN:
411 break;
412 default:
413 error = EOPNOTSUPP;
414 break;
415 }
416
417 return (error);
418 }
419
420 static int
vtnet_probe(device_t dev)421 vtnet_probe(device_t dev)
422 {
423 return (VIRTIO_SIMPLE_PROBE(dev, vtnet));
424 }
425
426 static int
vtnet_attach(device_t dev)427 vtnet_attach(device_t dev)
428 {
429 struct vtnet_softc *sc;
430 int error;
431
432 sc = device_get_softc(dev);
433 sc->vtnet_dev = dev;
434 virtio_set_feature_desc(dev, vtnet_feature_desc);
435
436 VTNET_CORE_LOCK_INIT(sc);
437 callout_init_mtx(&sc->vtnet_tick_ch, VTNET_CORE_MTX(sc), 0);
438 vtnet_load_tunables(sc);
439
440 vtnet_alloc_interface(sc);
441 vtnet_setup_sysctl(sc);
442
443 error = vtnet_setup_features(sc);
444 if (error) {
445 device_printf(dev, "cannot setup features\n");
446 goto fail;
447 }
448
449 error = vtnet_alloc_rx_filters(sc);
450 if (error) {
451 device_printf(dev, "cannot allocate Rx filters\n");
452 goto fail;
453 }
454
455 error = vtnet_alloc_rxtx_queues(sc);
456 if (error) {
457 device_printf(dev, "cannot allocate queues\n");
458 goto fail;
459 }
460
461 error = vtnet_alloc_virtqueues(sc);
462 if (error) {
463 device_printf(dev, "cannot allocate virtqueues\n");
464 goto fail;
465 }
466
467 error = vtnet_setup_interface(sc);
468 if (error) {
469 device_printf(dev, "cannot setup interface\n");
470 goto fail;
471 }
472
473 error = virtio_setup_intr(dev, INTR_TYPE_NET);
474 if (error) {
475 device_printf(dev, "cannot setup interrupts\n");
476 ether_ifdetach(sc->vtnet_ifp);
477 goto fail;
478 }
479
480 #ifdef DEV_NETMAP
481 vtnet_netmap_attach(sc);
482 #endif
483 vtnet_start_taskqueues(sc);
484
485 fail:
486 if (error)
487 vtnet_detach(dev);
488
489 return (error);
490 }
491
492 static int
vtnet_detach(device_t dev)493 vtnet_detach(device_t dev)
494 {
495 struct vtnet_softc *sc;
496 if_t ifp;
497
498 sc = device_get_softc(dev);
499 ifp = sc->vtnet_ifp;
500
501 if (device_is_attached(dev)) {
502 VTNET_CORE_LOCK(sc);
503 vtnet_stop(sc);
504 VTNET_CORE_UNLOCK(sc);
505
506 callout_drain(&sc->vtnet_tick_ch);
507 vtnet_drain_taskqueues(sc);
508
509 ether_ifdetach(ifp);
510 }
511
512 #ifdef DEV_NETMAP
513 netmap_detach(ifp);
514 #endif
515
516 if (sc->vtnet_pfil != NULL) {
517 pfil_head_unregister(sc->vtnet_pfil);
518 sc->vtnet_pfil = NULL;
519 }
520
521 vtnet_free_taskqueues(sc);
522
523 if (sc->vtnet_vlan_attach != NULL) {
524 EVENTHANDLER_DEREGISTER(vlan_config, sc->vtnet_vlan_attach);
525 sc->vtnet_vlan_attach = NULL;
526 }
527 if (sc->vtnet_vlan_detach != NULL) {
528 EVENTHANDLER_DEREGISTER(vlan_unconfig, sc->vtnet_vlan_detach);
529 sc->vtnet_vlan_detach = NULL;
530 }
531
532 ifmedia_removeall(&sc->vtnet_media);
533
534 if (ifp != NULL) {
535 if_free(ifp);
536 sc->vtnet_ifp = NULL;
537 }
538
539 vtnet_free_rxtx_queues(sc);
540 vtnet_free_rx_filters(sc);
541
542 if (sc->vtnet_ctrl_vq != NULL)
543 vtnet_free_ctrl_vq(sc);
544
545 VTNET_CORE_LOCK_DESTROY(sc);
546
547 return (0);
548 }
549
550 static int
vtnet_suspend(device_t dev)551 vtnet_suspend(device_t dev)
552 {
553 struct vtnet_softc *sc;
554
555 sc = device_get_softc(dev);
556
557 VTNET_CORE_LOCK(sc);
558 vtnet_stop(sc);
559 sc->vtnet_flags |= VTNET_FLAG_SUSPENDED;
560 VTNET_CORE_UNLOCK(sc);
561
562 return (0);
563 }
564
565 static int
vtnet_resume(device_t dev)566 vtnet_resume(device_t dev)
567 {
568 struct vtnet_softc *sc;
569 if_t ifp;
570
571 sc = device_get_softc(dev);
572 ifp = sc->vtnet_ifp;
573
574 VTNET_CORE_LOCK(sc);
575 if (if_getflags(ifp) & IFF_UP)
576 vtnet_init_locked(sc, 0);
577 sc->vtnet_flags &= ~VTNET_FLAG_SUSPENDED;
578 VTNET_CORE_UNLOCK(sc);
579
580 return (0);
581 }
582
583 static int
vtnet_shutdown(device_t dev)584 vtnet_shutdown(device_t dev)
585 {
586 /*
587 * Suspend already does all of what we need to
588 * do here; we just never expect to be resumed.
589 */
590 return (vtnet_suspend(dev));
591 }
592
593 static int
vtnet_attach_completed(device_t dev)594 vtnet_attach_completed(device_t dev)
595 {
596 struct vtnet_softc *sc;
597
598 sc = device_get_softc(dev);
599
600 VTNET_CORE_LOCK(sc);
601 vtnet_attached_set_macaddr(sc);
602 VTNET_CORE_UNLOCK(sc);
603
604 return (0);
605 }
606
607 static int
vtnet_config_change(device_t dev)608 vtnet_config_change(device_t dev)
609 {
610 struct vtnet_softc *sc;
611
612 sc = device_get_softc(dev);
613
614 VTNET_CORE_LOCK(sc);
615 vtnet_update_link_status(sc);
616 if (sc->vtnet_link_active != 0)
617 vtnet_tx_start_all(sc);
618 VTNET_CORE_UNLOCK(sc);
619
620 return (0);
621 }
622
623 static int
vtnet_negotiate_features(struct vtnet_softc * sc)624 vtnet_negotiate_features(struct vtnet_softc *sc)
625 {
626 device_t dev;
627 uint64_t features, negotiated_features;
628 int no_csum;
629
630 dev = sc->vtnet_dev;
631 features = virtio_bus_is_modern(dev) ? VTNET_MODERN_FEATURES :
632 VTNET_LEGACY_FEATURES;
633
634 /*
635 * TSO and LRO are only available when their corresponding checksum
636 * offload feature is also negotiated.
637 */
638 no_csum = vtnet_tunable_int(sc, "csum_disable", vtnet_csum_disable);
639 if (no_csum)
640 features &= ~(VIRTIO_NET_F_CSUM | VIRTIO_NET_F_GUEST_CSUM);
641 if (no_csum || vtnet_tunable_int(sc, "tso_disable", vtnet_tso_disable))
642 features &= ~VTNET_TSO_FEATURES;
643 if (no_csum || vtnet_tunable_int(sc, "lro_disable", vtnet_lro_disable))
644 features &= ~VTNET_LRO_FEATURES;
645
646 #ifndef VTNET_LEGACY_TX
647 if (vtnet_tunable_int(sc, "mq_disable", vtnet_mq_disable))
648 features &= ~VIRTIO_NET_F_MQ;
649 #else
650 features &= ~VIRTIO_NET_F_MQ;
651 #endif
652
653 negotiated_features = virtio_negotiate_features(dev, features);
654
655 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
656 uint16_t mtu;
657
658 mtu = virtio_read_dev_config_2(dev,
659 offsetof(struct virtio_net_config, mtu));
660 if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) {
661 device_printf(dev, "Invalid MTU value: %d. "
662 "MTU feature disabled.\n", mtu);
663 features &= ~VIRTIO_NET_F_MTU;
664 negotiated_features =
665 virtio_negotiate_features(dev, features);
666 }
667 }
668
669 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
670 uint16_t npairs;
671
672 npairs = virtio_read_dev_config_2(dev,
673 offsetof(struct virtio_net_config, max_virtqueue_pairs));
674 if (npairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
675 npairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) {
676 device_printf(dev, "Invalid max_virtqueue_pairs value: "
677 "%d. Multiqueue feature disabled.\n", npairs);
678 features &= ~VIRTIO_NET_F_MQ;
679 negotiated_features =
680 virtio_negotiate_features(dev, features);
681 }
682 }
683
684 if (virtio_with_feature(dev, VTNET_LRO_FEATURES) &&
685 virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF) == 0) {
686 /*
687 * LRO without mergeable buffers requires special care. This
688 * is not ideal because every receive buffer must be large
689 * enough to hold the maximum TCP packet, the Ethernet header,
690 * and the header. This requires up to 34 descriptors with
691 * MCLBYTES clusters. If we do not have indirect descriptors,
692 * LRO is disabled since the virtqueue will not contain very
693 * many receive buffers.
694 */
695 if (!virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC)) {
696 device_printf(dev,
697 "Host LRO disabled since both mergeable buffers "
698 "and indirect descriptors were not negotiated\n");
699 features &= ~VTNET_LRO_FEATURES;
700 negotiated_features =
701 virtio_negotiate_features(dev, features);
702 } else
703 sc->vtnet_flags |= VTNET_FLAG_LRO_NOMRG;
704 }
705
706 sc->vtnet_features = negotiated_features;
707 sc->vtnet_negotiated_features = negotiated_features;
708
709 return (virtio_finalize_features(dev));
710 }
711
712 static int
vtnet_setup_features(struct vtnet_softc * sc)713 vtnet_setup_features(struct vtnet_softc *sc)
714 {
715 device_t dev;
716 int error;
717
718 dev = sc->vtnet_dev;
719
720 error = vtnet_negotiate_features(sc);
721 if (error)
722 return (error);
723
724 if (virtio_with_feature(dev, VIRTIO_F_VERSION_1))
725 sc->vtnet_flags |= VTNET_FLAG_MODERN;
726 if (virtio_with_feature(dev, VIRTIO_RING_F_INDIRECT_DESC))
727 sc->vtnet_flags |= VTNET_FLAG_INDIRECT;
728 if (virtio_with_feature(dev, VIRTIO_RING_F_EVENT_IDX))
729 sc->vtnet_flags |= VTNET_FLAG_EVENT_IDX;
730
731 if (virtio_with_feature(dev, VIRTIO_NET_F_MAC)) {
732 /* This feature should always be negotiated. */
733 sc->vtnet_flags |= VTNET_FLAG_MAC;
734 }
735
736 if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
737 sc->vtnet_max_mtu = virtio_read_dev_config_2(dev,
738 offsetof(struct virtio_net_config, mtu));
739 } else
740 sc->vtnet_max_mtu = VTNET_MAX_MTU;
741
742 if (virtio_with_feature(dev, VIRTIO_NET_F_MRG_RXBUF)) {
743 sc->vtnet_flags |= VTNET_FLAG_MRG_RXBUFS;
744 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf);
745 } else if (vtnet_modern(sc)) {
746 /* This is identical to the mergeable header. */
747 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr_v1);
748 } else
749 sc->vtnet_hdr_size = sizeof(struct virtio_net_hdr);
750
751 if (vtnet_modern(sc) || sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
752 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_INLINE;
753 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
754 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_LRO_NOMRG;
755 else
756 sc->vtnet_rx_nsegs = VTNET_RX_SEGS_HDR_SEPARATE;
757
758 /*
759 * Favor "hardware" LRO if negotiated, but support software LRO as
760 * a fallback; there is usually little benefit (or worse) with both.
761 */
762 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO4) == 0 &&
763 virtio_with_feature(dev, VIRTIO_NET_F_GUEST_TSO6) == 0)
764 sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
765
766 if (virtio_with_feature(dev, VIRTIO_NET_F_GSO) ||
767 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4) ||
768 virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
769 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MAX;
770 else
771 sc->vtnet_tx_nsegs = VTNET_TX_SEGS_MIN;
772
773 sc->vtnet_req_vq_pairs = 1;
774 sc->vtnet_max_vq_pairs = 1;
775
776 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VQ)) {
777 sc->vtnet_flags |= VTNET_FLAG_CTRL_VQ;
778
779 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_RX))
780 sc->vtnet_flags |= VTNET_FLAG_CTRL_RX;
781 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_VLAN))
782 sc->vtnet_flags |= VTNET_FLAG_VLAN_FILTER;
783 if (virtio_with_feature(dev, VIRTIO_NET_F_CTRL_MAC_ADDR))
784 sc->vtnet_flags |= VTNET_FLAG_CTRL_MAC;
785
786 if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
787 sc->vtnet_max_vq_pairs = virtio_read_dev_config_2(dev,
788 offsetof(struct virtio_net_config,
789 max_virtqueue_pairs));
790 }
791 }
792
793 if (sc->vtnet_max_vq_pairs > 1) {
794 int req;
795
796 /*
797 * Limit the maximum number of requested queue pairs to the
798 * number of CPUs and the configured maximum.
799 */
800 req = vtnet_tunable_int(sc, "mq_max_pairs", vtnet_mq_max_pairs);
801 if (req < 0)
802 req = 1;
803 if (req == 0)
804 req = mp_ncpus;
805 if (req > sc->vtnet_max_vq_pairs)
806 req = sc->vtnet_max_vq_pairs;
807 if (req > mp_ncpus)
808 req = mp_ncpus;
809 if (req > 1) {
810 sc->vtnet_req_vq_pairs = req;
811 sc->vtnet_flags |= VTNET_FLAG_MQ;
812 }
813 }
814
815 return (0);
816 }
817
818 static int
vtnet_init_rxq(struct vtnet_softc * sc,int id)819 vtnet_init_rxq(struct vtnet_softc *sc, int id)
820 {
821 struct vtnet_rxq *rxq;
822
823 rxq = &sc->vtnet_rxqs[id];
824
825 snprintf(rxq->vtnrx_name, sizeof(rxq->vtnrx_name), "%s-rx%d",
826 device_get_nameunit(sc->vtnet_dev), id);
827 mtx_init(&rxq->vtnrx_mtx, rxq->vtnrx_name, NULL, MTX_DEF);
828
829 rxq->vtnrx_sc = sc;
830 rxq->vtnrx_id = id;
831
832 rxq->vtnrx_sg = sglist_alloc(sc->vtnet_rx_nsegs, M_NOWAIT);
833 if (rxq->vtnrx_sg == NULL)
834 return (ENOMEM);
835
836 #if defined(INET) || defined(INET6)
837 if (vtnet_software_lro(sc)) {
838 if (tcp_lro_init_args(&rxq->vtnrx_lro, sc->vtnet_ifp,
839 sc->vtnet_lro_entry_count, sc->vtnet_lro_mbufq_depth) != 0)
840 return (ENOMEM);
841 }
842 #endif
843
844 NET_TASK_INIT(&rxq->vtnrx_intrtask, 0, vtnet_rxq_tq_intr, rxq);
845 rxq->vtnrx_tq = taskqueue_create(rxq->vtnrx_name, M_NOWAIT,
846 taskqueue_thread_enqueue, &rxq->vtnrx_tq);
847
848 return (rxq->vtnrx_tq == NULL ? ENOMEM : 0);
849 }
850
851 static int
vtnet_init_txq(struct vtnet_softc * sc,int id)852 vtnet_init_txq(struct vtnet_softc *sc, int id)
853 {
854 struct vtnet_txq *txq;
855
856 txq = &sc->vtnet_txqs[id];
857
858 snprintf(txq->vtntx_name, sizeof(txq->vtntx_name), "%s-tx%d",
859 device_get_nameunit(sc->vtnet_dev), id);
860 mtx_init(&txq->vtntx_mtx, txq->vtntx_name, NULL, MTX_DEF);
861
862 txq->vtntx_sc = sc;
863 txq->vtntx_id = id;
864
865 txq->vtntx_sg = sglist_alloc(sc->vtnet_tx_nsegs, M_NOWAIT);
866 if (txq->vtntx_sg == NULL)
867 return (ENOMEM);
868
869 #ifndef VTNET_LEGACY_TX
870 txq->vtntx_br = buf_ring_alloc(VTNET_DEFAULT_BUFRING_SIZE, M_DEVBUF,
871 M_NOWAIT, &txq->vtntx_mtx);
872 if (txq->vtntx_br == NULL)
873 return (ENOMEM);
874
875 TASK_INIT(&txq->vtntx_defrtask, 0, vtnet_txq_tq_deferred, txq);
876 #endif
877 TASK_INIT(&txq->vtntx_intrtask, 0, vtnet_txq_tq_intr, txq);
878 txq->vtntx_tq = taskqueue_create(txq->vtntx_name, M_NOWAIT,
879 taskqueue_thread_enqueue, &txq->vtntx_tq);
880 if (txq->vtntx_tq == NULL)
881 return (ENOMEM);
882
883 return (0);
884 }
885
886 static int
vtnet_alloc_rxtx_queues(struct vtnet_softc * sc)887 vtnet_alloc_rxtx_queues(struct vtnet_softc *sc)
888 {
889 int i, npairs, error;
890
891 npairs = sc->vtnet_max_vq_pairs;
892
893 sc->vtnet_rxqs = malloc(sizeof(struct vtnet_rxq) * npairs, M_DEVBUF,
894 M_NOWAIT | M_ZERO);
895 sc->vtnet_txqs = malloc(sizeof(struct vtnet_txq) * npairs, M_DEVBUF,
896 M_NOWAIT | M_ZERO);
897 if (sc->vtnet_rxqs == NULL || sc->vtnet_txqs == NULL)
898 return (ENOMEM);
899
900 for (i = 0; i < npairs; i++) {
901 error = vtnet_init_rxq(sc, i);
902 if (error)
903 return (error);
904 error = vtnet_init_txq(sc, i);
905 if (error)
906 return (error);
907 }
908
909 vtnet_set_rx_process_limit(sc);
910 vtnet_setup_queue_sysctl(sc);
911
912 return (0);
913 }
914
915 static void
vtnet_destroy_rxq(struct vtnet_rxq * rxq)916 vtnet_destroy_rxq(struct vtnet_rxq *rxq)
917 {
918
919 rxq->vtnrx_sc = NULL;
920 rxq->vtnrx_id = -1;
921
922 #if defined(INET) || defined(INET6)
923 tcp_lro_free(&rxq->vtnrx_lro);
924 #endif
925
926 if (rxq->vtnrx_sg != NULL) {
927 sglist_free(rxq->vtnrx_sg);
928 rxq->vtnrx_sg = NULL;
929 }
930
931 if (mtx_initialized(&rxq->vtnrx_mtx) != 0)
932 mtx_destroy(&rxq->vtnrx_mtx);
933 }
934
935 static void
vtnet_destroy_txq(struct vtnet_txq * txq)936 vtnet_destroy_txq(struct vtnet_txq *txq)
937 {
938
939 txq->vtntx_sc = NULL;
940 txq->vtntx_id = -1;
941
942 if (txq->vtntx_sg != NULL) {
943 sglist_free(txq->vtntx_sg);
944 txq->vtntx_sg = NULL;
945 }
946
947 #ifndef VTNET_LEGACY_TX
948 if (txq->vtntx_br != NULL) {
949 buf_ring_free(txq->vtntx_br, M_DEVBUF);
950 txq->vtntx_br = NULL;
951 }
952 #endif
953
954 if (mtx_initialized(&txq->vtntx_mtx) != 0)
955 mtx_destroy(&txq->vtntx_mtx);
956 }
957
958 static void
vtnet_free_rxtx_queues(struct vtnet_softc * sc)959 vtnet_free_rxtx_queues(struct vtnet_softc *sc)
960 {
961 int i;
962
963 if (sc->vtnet_rxqs != NULL) {
964 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
965 vtnet_destroy_rxq(&sc->vtnet_rxqs[i]);
966 free(sc->vtnet_rxqs, M_DEVBUF);
967 sc->vtnet_rxqs = NULL;
968 }
969
970 if (sc->vtnet_txqs != NULL) {
971 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
972 vtnet_destroy_txq(&sc->vtnet_txqs[i]);
973 free(sc->vtnet_txqs, M_DEVBUF);
974 sc->vtnet_txqs = NULL;
975 }
976 }
977
978 static int
vtnet_alloc_rx_filters(struct vtnet_softc * sc)979 vtnet_alloc_rx_filters(struct vtnet_softc *sc)
980 {
981
982 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
983 sc->vtnet_mac_filter = malloc(sizeof(struct vtnet_mac_filter),
984 M_DEVBUF, M_NOWAIT | M_ZERO);
985 if (sc->vtnet_mac_filter == NULL)
986 return (ENOMEM);
987 }
988
989 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
990 sc->vtnet_vlan_filter = malloc(sizeof(uint32_t) *
991 VTNET_VLAN_FILTER_NWORDS, M_DEVBUF, M_NOWAIT | M_ZERO);
992 if (sc->vtnet_vlan_filter == NULL)
993 return (ENOMEM);
994 }
995
996 return (0);
997 }
998
999 static void
vtnet_free_rx_filters(struct vtnet_softc * sc)1000 vtnet_free_rx_filters(struct vtnet_softc *sc)
1001 {
1002
1003 if (sc->vtnet_mac_filter != NULL) {
1004 free(sc->vtnet_mac_filter, M_DEVBUF);
1005 sc->vtnet_mac_filter = NULL;
1006 }
1007
1008 if (sc->vtnet_vlan_filter != NULL) {
1009 free(sc->vtnet_vlan_filter, M_DEVBUF);
1010 sc->vtnet_vlan_filter = NULL;
1011 }
1012 }
1013
1014 static int
vtnet_alloc_virtqueues(struct vtnet_softc * sc)1015 vtnet_alloc_virtqueues(struct vtnet_softc *sc)
1016 {
1017 device_t dev;
1018 struct vq_alloc_info *info;
1019 struct vtnet_rxq *rxq;
1020 struct vtnet_txq *txq;
1021 int i, idx, nvqs, error;
1022
1023 dev = sc->vtnet_dev;
1024
1025 nvqs = sc->vtnet_max_vq_pairs * 2;
1026 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
1027 nvqs++;
1028
1029 info = malloc(sizeof(struct vq_alloc_info) * nvqs, M_TEMP, M_NOWAIT);
1030 if (info == NULL)
1031 return (ENOMEM);
1032
1033 for (i = 0, idx = 0; i < sc->vtnet_req_vq_pairs; i++, idx += 2) {
1034 rxq = &sc->vtnet_rxqs[i];
1035 VQ_ALLOC_INFO_INIT(&info[idx], sc->vtnet_rx_nsegs,
1036 vtnet_rx_vq_intr, rxq, &rxq->vtnrx_vq,
1037 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id);
1038
1039 txq = &sc->vtnet_txqs[i];
1040 VQ_ALLOC_INFO_INIT(&info[idx+1], sc->vtnet_tx_nsegs,
1041 vtnet_tx_vq_intr, txq, &txq->vtntx_vq,
1042 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id);
1043 }
1044
1045 /* These queues will not be used so allocate the minimum resources. */
1046 for (/**/; i < sc->vtnet_max_vq_pairs; i++, idx += 2) {
1047 rxq = &sc->vtnet_rxqs[i];
1048 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, rxq, &rxq->vtnrx_vq,
1049 "%s-rx%d", device_get_nameunit(dev), rxq->vtnrx_id);
1050
1051 txq = &sc->vtnet_txqs[i];
1052 VQ_ALLOC_INFO_INIT(&info[idx+1], 0, NULL, txq, &txq->vtntx_vq,
1053 "%s-tx%d", device_get_nameunit(dev), txq->vtntx_id);
1054 }
1055
1056 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ) {
1057 VQ_ALLOC_INFO_INIT(&info[idx], 0, NULL, NULL,
1058 &sc->vtnet_ctrl_vq, "%s ctrl", device_get_nameunit(dev));
1059 }
1060
1061 error = virtio_alloc_virtqueues(dev, nvqs, info);
1062 free(info, M_TEMP);
1063
1064 return (error);
1065 }
1066
1067 static void
vtnet_alloc_interface(struct vtnet_softc * sc)1068 vtnet_alloc_interface(struct vtnet_softc *sc)
1069 {
1070 device_t dev;
1071 if_t ifp;
1072
1073 dev = sc->vtnet_dev;
1074
1075 ifp = if_alloc(IFT_ETHER);
1076 sc->vtnet_ifp = ifp;
1077 if_setsoftc(ifp, sc);
1078 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
1079 }
1080
1081 static int
vtnet_setup_interface(struct vtnet_softc * sc)1082 vtnet_setup_interface(struct vtnet_softc *sc)
1083 {
1084 device_t dev;
1085 struct pfil_head_args pa;
1086 if_t ifp;
1087
1088 dev = sc->vtnet_dev;
1089 ifp = sc->vtnet_ifp;
1090
1091 if_setflags(ifp, IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
1092 if_setbaudrate(ifp, IF_Gbps(10));
1093 if_setinitfn(ifp, vtnet_init);
1094 if_setioctlfn(ifp, vtnet_ioctl);
1095 if_setgetcounterfn(ifp, vtnet_get_counter);
1096 #ifndef VTNET_LEGACY_TX
1097 if_settransmitfn(ifp, vtnet_txq_mq_start);
1098 if_setqflushfn(ifp, vtnet_qflush);
1099 #else
1100 struct virtqueue *vq = sc->vtnet_txqs[0].vtntx_vq;
1101 if_setstartfn(ifp, vtnet_start);
1102 if_setsendqlen(ifp, virtqueue_size(vq) - 1);
1103 if_setsendqready(ifp);
1104 #endif
1105
1106 vtnet_get_macaddr(sc);
1107
1108 if (virtio_with_feature(dev, VIRTIO_NET_F_STATUS))
1109 if_setcapabilitiesbit(ifp, IFCAP_LINKSTATE, 0);
1110
1111 ifmedia_init(&sc->vtnet_media, 0, vtnet_ifmedia_upd, vtnet_ifmedia_sts);
1112 ifmedia_add(&sc->vtnet_media, IFM_ETHER | IFM_AUTO, 0, NULL);
1113 ifmedia_set(&sc->vtnet_media, IFM_ETHER | IFM_AUTO);
1114
1115 if (virtio_with_feature(dev, VIRTIO_NET_F_CSUM)) {
1116 int gso;
1117
1118 if_setcapabilitiesbit(ifp, IFCAP_TXCSUM | IFCAP_TXCSUM_IPV6, 0);
1119
1120 gso = virtio_with_feature(dev, VIRTIO_NET_F_GSO);
1121 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO4))
1122 if_setcapabilitiesbit(ifp, IFCAP_TSO4, 0);
1123 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_TSO6))
1124 if_setcapabilitiesbit(ifp, IFCAP_TSO6, 0);
1125 if (gso || virtio_with_feature(dev, VIRTIO_NET_F_HOST_ECN))
1126 sc->vtnet_flags |= VTNET_FLAG_TSO_ECN;
1127
1128 if (if_getcapabilities(ifp) & (IFCAP_TSO4 | IFCAP_TSO6)) {
1129 int tso_maxlen;
1130
1131 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTSO, 0);
1132
1133 tso_maxlen = vtnet_tunable_int(sc, "tso_maxlen",
1134 vtnet_tso_maxlen);
1135 if_sethwtsomax(ifp, tso_maxlen -
1136 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN));
1137 if_sethwtsomaxsegcount(ifp, sc->vtnet_tx_nsegs - 1);
1138 if_sethwtsomaxsegsize(ifp, PAGE_SIZE);
1139 }
1140 }
1141
1142 if (virtio_with_feature(dev, VIRTIO_NET_F_GUEST_CSUM)) {
1143 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM, 0);
1144 #ifdef notyet
1145 /* BMV: Rx checksums not distinguished between IPv4 and IPv6. */
1146 if_setcapabilitiesbit(ifp, IFCAP_RXCSUM_IPV6, 0);
1147 #endif
1148
1149 if (vtnet_tunable_int(sc, "fixup_needs_csum",
1150 vtnet_fixup_needs_csum) != 0)
1151 sc->vtnet_flags |= VTNET_FLAG_FIXUP_NEEDS_CSUM;
1152
1153 /* Support either "hardware" or software LRO. */
1154 if_setcapabilitiesbit(ifp, IFCAP_LRO, 0);
1155 }
1156
1157 if (if_getcapabilities(ifp) & (IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6)) {
1158 /*
1159 * VirtIO does not support VLAN tagging, but we can fake
1160 * it by inserting and removing the 802.1Q header during
1161 * transmit and receive. We are then able to do checksum
1162 * offloading of VLAN frames.
1163 */
1164 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_HWCSUM, 0);
1165 }
1166
1167 if (sc->vtnet_max_mtu >= ETHERMTU_JUMBO)
1168 if_setcapabilitiesbit(ifp, IFCAP_JUMBO_MTU, 0);
1169 if_setcapabilitiesbit(ifp, IFCAP_VLAN_MTU, 0);
1170
1171 /*
1172 * Capabilities after here are not enabled by default.
1173 */
1174 if_setcapenable(ifp, if_getcapabilities(ifp));
1175
1176 if (sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER) {
1177 if_setcapabilitiesbit(ifp, IFCAP_VLAN_HWFILTER, 0);
1178
1179 sc->vtnet_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
1180 vtnet_register_vlan, sc, EVENTHANDLER_PRI_FIRST);
1181 sc->vtnet_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
1182 vtnet_unregister_vlan, sc, EVENTHANDLER_PRI_FIRST);
1183 }
1184
1185 ether_ifattach(ifp, sc->vtnet_hwaddr);
1186
1187 /* Tell the upper layer(s) we support long frames. */
1188 if_setifheaderlen(ifp, sizeof(struct ether_vlan_header));
1189
1190 DEBUGNET_SET(ifp, vtnet);
1191
1192 pa.pa_version = PFIL_VERSION;
1193 pa.pa_flags = PFIL_IN;
1194 pa.pa_type = PFIL_TYPE_ETHERNET;
1195 pa.pa_headname = if_name(ifp);
1196 sc->vtnet_pfil = pfil_head_register(&pa);
1197
1198 return (0);
1199 }
1200
1201 static int
vtnet_rx_cluster_size(struct vtnet_softc * sc,int mtu)1202 vtnet_rx_cluster_size(struct vtnet_softc *sc, int mtu)
1203 {
1204 int framesz;
1205
1206 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS)
1207 return (MJUMPAGESIZE);
1208 else if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1209 return (MCLBYTES);
1210
1211 /*
1212 * Try to scale the receive mbuf cluster size from the MTU. We
1213 * could also use the VQ size to influence the selected size,
1214 * but that would only matter for very small queues.
1215 */
1216 if (vtnet_modern(sc)) {
1217 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr_v1));
1218 framesz = sizeof(struct virtio_net_hdr_v1);
1219 } else
1220 framesz = sizeof(struct vtnet_rx_header);
1221 framesz += sizeof(struct ether_vlan_header) + mtu;
1222 /*
1223 * Account for the offsetting we'll do elsewhere so we allocate the
1224 * right size for the mtu.
1225 */
1226 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) {
1227 framesz += VTNET_ETHER_ALIGN;
1228 }
1229
1230 if (framesz <= MCLBYTES)
1231 return (MCLBYTES);
1232 else if (framesz <= MJUMPAGESIZE)
1233 return (MJUMPAGESIZE);
1234 else if (framesz <= MJUM9BYTES)
1235 return (MJUM9BYTES);
1236
1237 /* Sane default; avoid 16KB clusters. */
1238 return (MCLBYTES);
1239 }
1240
1241 static int
vtnet_ioctl_mtu(struct vtnet_softc * sc,u_int mtu)1242 vtnet_ioctl_mtu(struct vtnet_softc *sc, u_int mtu)
1243 {
1244 if_t ifp;
1245 int clustersz;
1246
1247 ifp = sc->vtnet_ifp;
1248 VTNET_CORE_LOCK_ASSERT(sc);
1249
1250 if (if_getmtu(ifp) == mtu)
1251 return (0);
1252 else if (mtu < ETHERMIN || mtu > sc->vtnet_max_mtu)
1253 return (EINVAL);
1254
1255 if_setmtu(ifp, mtu);
1256 clustersz = vtnet_rx_cluster_size(sc, mtu);
1257
1258 if (clustersz != sc->vtnet_rx_clustersz &&
1259 if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
1260 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
1261 vtnet_init_locked(sc, 0);
1262 }
1263
1264 return (0);
1265 }
1266
1267 static int
vtnet_ioctl_ifflags(struct vtnet_softc * sc)1268 vtnet_ioctl_ifflags(struct vtnet_softc *sc)
1269 {
1270 if_t ifp;
1271 int drv_running;
1272
1273 ifp = sc->vtnet_ifp;
1274 drv_running = (if_getdrvflags(ifp) & IFF_DRV_RUNNING) != 0;
1275
1276 VTNET_CORE_LOCK_ASSERT(sc);
1277
1278 if ((if_getflags(ifp) & IFF_UP) == 0) {
1279 if (drv_running)
1280 vtnet_stop(sc);
1281 goto out;
1282 }
1283
1284 if (!drv_running) {
1285 vtnet_init_locked(sc, 0);
1286 goto out;
1287 }
1288
1289 if ((if_getflags(ifp) ^ sc->vtnet_if_flags) &
1290 (IFF_PROMISC | IFF_ALLMULTI)) {
1291 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
1292 vtnet_rx_filter(sc);
1293 else {
1294 /*
1295 * We don't support filtering out multicast, so
1296 * ALLMULTI is always set.
1297 */
1298 if_setflagbits(ifp, IFF_ALLMULTI, 0);
1299 if_setflagbits(ifp, IFF_PROMISC, 0);
1300 }
1301 }
1302
1303 out:
1304 sc->vtnet_if_flags = if_getflags(ifp);
1305 return (0);
1306 }
1307
1308 static int
vtnet_ioctl_multi(struct vtnet_softc * sc)1309 vtnet_ioctl_multi(struct vtnet_softc *sc)
1310 {
1311 if_t ifp;
1312
1313 ifp = sc->vtnet_ifp;
1314
1315 VTNET_CORE_LOCK_ASSERT(sc);
1316
1317 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX &&
1318 if_getdrvflags(ifp) & IFF_DRV_RUNNING)
1319 vtnet_rx_filter_mac(sc);
1320
1321 return (0);
1322 }
1323
1324 static int
vtnet_ioctl_ifcap(struct vtnet_softc * sc,struct ifreq * ifr)1325 vtnet_ioctl_ifcap(struct vtnet_softc *sc, struct ifreq *ifr)
1326 {
1327 if_t ifp;
1328 int mask, reinit, update;
1329
1330 ifp = sc->vtnet_ifp;
1331 mask = (ifr->ifr_reqcap & if_getcapabilities(ifp)) ^ if_getcapenable(ifp);
1332 reinit = update = 0;
1333
1334 VTNET_CORE_LOCK_ASSERT(sc);
1335
1336 if (mask & IFCAP_TXCSUM)
1337 if_togglecapenable(ifp, IFCAP_TXCSUM);
1338 if (mask & IFCAP_TXCSUM_IPV6)
1339 if_togglecapenable(ifp, IFCAP_TXCSUM_IPV6);
1340 if (mask & IFCAP_TSO4)
1341 if_togglecapenable(ifp, IFCAP_TSO4);
1342 if (mask & IFCAP_TSO6)
1343 if_togglecapenable(ifp, IFCAP_TSO6);
1344
1345 if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) {
1346 /*
1347 * These Rx features require the negotiated features to
1348 * be updated. Avoid a full reinit if possible.
1349 */
1350 if (sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
1351 update = 1;
1352 else
1353 reinit = 1;
1354
1355 /* BMV: Avoid needless renegotiation for just software LRO. */
1356 if ((mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO)) ==
1357 IFCAP_LRO && vtnet_software_lro(sc))
1358 reinit = update = 0;
1359
1360 if (mask & IFCAP_RXCSUM)
1361 if_togglecapenable(ifp, IFCAP_RXCSUM);
1362 if (mask & IFCAP_RXCSUM_IPV6)
1363 if_togglecapenable(ifp, IFCAP_RXCSUM_IPV6);
1364 if (mask & IFCAP_LRO)
1365 if_togglecapenable(ifp, IFCAP_LRO);
1366
1367 /*
1368 * VirtIO does not distinguish between IPv4 and IPv6 checksums
1369 * so treat them as a pair. Guest TSO (LRO) requires receive
1370 * checksums.
1371 */
1372 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
1373 if_setcapenablebit(ifp, IFCAP_RXCSUM, 0);
1374 #ifdef notyet
1375 if_setcapenablebit(ifp, IFCAP_RXCSUM_IPV6, 0);
1376 #endif
1377 } else
1378 if_setcapenablebit(ifp, 0,
1379 (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | IFCAP_LRO));
1380 }
1381
1382 if (mask & IFCAP_VLAN_HWFILTER) {
1383 /* These Rx features require renegotiation. */
1384 reinit = 1;
1385
1386 if (mask & IFCAP_VLAN_HWFILTER)
1387 if_togglecapenable(ifp, IFCAP_VLAN_HWFILTER);
1388 }
1389
1390 if (mask & IFCAP_VLAN_HWTSO)
1391 if_togglecapenable(ifp, IFCAP_VLAN_HWTSO);
1392 if (mask & IFCAP_VLAN_HWTAGGING)
1393 if_togglecapenable(ifp, IFCAP_VLAN_HWTAGGING);
1394
1395 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
1396 if (reinit) {
1397 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
1398 vtnet_init_locked(sc, 0);
1399 } else if (update)
1400 vtnet_update_rx_offloads(sc);
1401 }
1402
1403 return (0);
1404 }
1405
1406 static int
vtnet_ioctl(if_t ifp,u_long cmd,caddr_t data)1407 vtnet_ioctl(if_t ifp, u_long cmd, caddr_t data)
1408 {
1409 struct vtnet_softc *sc;
1410 struct ifreq *ifr;
1411 int error;
1412
1413 sc = if_getsoftc(ifp);
1414 ifr = (struct ifreq *) data;
1415 error = 0;
1416
1417 switch (cmd) {
1418 case SIOCSIFMTU:
1419 VTNET_CORE_LOCK(sc);
1420 error = vtnet_ioctl_mtu(sc, ifr->ifr_mtu);
1421 VTNET_CORE_UNLOCK(sc);
1422 break;
1423
1424 case SIOCSIFFLAGS:
1425 VTNET_CORE_LOCK(sc);
1426 error = vtnet_ioctl_ifflags(sc);
1427 VTNET_CORE_UNLOCK(sc);
1428 break;
1429
1430 case SIOCADDMULTI:
1431 case SIOCDELMULTI:
1432 VTNET_CORE_LOCK(sc);
1433 error = vtnet_ioctl_multi(sc);
1434 VTNET_CORE_UNLOCK(sc);
1435 break;
1436
1437 case SIOCSIFMEDIA:
1438 case SIOCGIFMEDIA:
1439 error = ifmedia_ioctl(ifp, ifr, &sc->vtnet_media, cmd);
1440 break;
1441
1442 case SIOCSIFCAP:
1443 VTNET_CORE_LOCK(sc);
1444 error = vtnet_ioctl_ifcap(sc, ifr);
1445 VTNET_CORE_UNLOCK(sc);
1446 VLAN_CAPABILITIES(ifp);
1447 break;
1448
1449 default:
1450 error = ether_ioctl(ifp, cmd, data);
1451 break;
1452 }
1453
1454 VTNET_CORE_LOCK_ASSERT_NOTOWNED(sc);
1455
1456 return (error);
1457 }
1458
1459 static int
vtnet_rxq_populate(struct vtnet_rxq * rxq)1460 vtnet_rxq_populate(struct vtnet_rxq *rxq)
1461 {
1462 struct virtqueue *vq;
1463 int nbufs, error;
1464
1465 #ifdef DEV_NETMAP
1466 error = vtnet_netmap_rxq_populate(rxq);
1467 if (error >= 0)
1468 return (error);
1469 #endif /* DEV_NETMAP */
1470
1471 vq = rxq->vtnrx_vq;
1472 error = ENOSPC;
1473
1474 for (nbufs = 0; !virtqueue_full(vq); nbufs++) {
1475 error = vtnet_rxq_new_buf(rxq);
1476 if (error)
1477 break;
1478 }
1479
1480 if (nbufs > 0) {
1481 virtqueue_notify(vq);
1482 /*
1483 * EMSGSIZE signifies the virtqueue did not have enough
1484 * entries available to hold the last mbuf. This is not
1485 * an error.
1486 */
1487 if (error == EMSGSIZE)
1488 error = 0;
1489 }
1490
1491 return (error);
1492 }
1493
1494 static void
vtnet_rxq_free_mbufs(struct vtnet_rxq * rxq)1495 vtnet_rxq_free_mbufs(struct vtnet_rxq *rxq)
1496 {
1497 struct virtqueue *vq;
1498 struct mbuf *m;
1499 int last;
1500 #ifdef DEV_NETMAP
1501 struct netmap_kring *kring = netmap_kring_on(NA(rxq->vtnrx_sc->vtnet_ifp),
1502 rxq->vtnrx_id, NR_RX);
1503 #else /* !DEV_NETMAP */
1504 void *kring = NULL;
1505 #endif /* !DEV_NETMAP */
1506
1507 vq = rxq->vtnrx_vq;
1508 last = 0;
1509
1510 while ((m = virtqueue_drain(vq, &last)) != NULL) {
1511 if (kring == NULL)
1512 m_freem(m);
1513 }
1514
1515 KASSERT(virtqueue_empty(vq),
1516 ("%s: mbufs remaining in rx queue %p", __func__, rxq));
1517 }
1518
1519 static struct mbuf *
vtnet_rx_alloc_buf(struct vtnet_softc * sc,int nbufs,struct mbuf ** m_tailp)1520 vtnet_rx_alloc_buf(struct vtnet_softc *sc, int nbufs, struct mbuf **m_tailp)
1521 {
1522 struct mbuf *m_head, *m_tail, *m;
1523 int i, size;
1524
1525 m_head = NULL;
1526 size = sc->vtnet_rx_clustersz;
1527
1528 KASSERT(nbufs == 1 || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1529 ("%s: mbuf %d chain requested without LRO_NOMRG", __func__, nbufs));
1530
1531 for (i = 0; i < nbufs; i++) {
1532 m = m_getjcl(M_NOWAIT, MT_DATA, i == 0 ? M_PKTHDR : 0, size);
1533 if (m == NULL) {
1534 sc->vtnet_stats.mbuf_alloc_failed++;
1535 m_freem(m_head);
1536 return (NULL);
1537 }
1538
1539 m->m_len = size;
1540 /*
1541 * Need to offset the mbuf if the header we're going to add
1542 * will misalign.
1543 */
1544 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0) {
1545 m_adj(m, VTNET_ETHER_ALIGN);
1546 }
1547 if (m_head != NULL) {
1548 m_tail->m_next = m;
1549 m_tail = m;
1550 } else
1551 m_head = m_tail = m;
1552 }
1553
1554 if (m_tailp != NULL)
1555 *m_tailp = m_tail;
1556
1557 return (m_head);
1558 }
1559
1560 /*
1561 * Slow path for when LRO without mergeable buffers is negotiated.
1562 */
1563 static int
vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq * rxq,struct mbuf * m0,int len0)1564 vtnet_rxq_replace_lro_nomrg_buf(struct vtnet_rxq *rxq, struct mbuf *m0,
1565 int len0)
1566 {
1567 struct vtnet_softc *sc;
1568 struct mbuf *m, *m_prev, *m_new, *m_tail;
1569 int len, clustersz, nreplace, error;
1570
1571 sc = rxq->vtnrx_sc;
1572 clustersz = sc->vtnet_rx_clustersz;
1573 /*
1574 * Need to offset the mbuf if the header we're going to add will
1575 * misalign, account for that here.
1576 */
1577 if (VTNET_ETHER_ALIGN != 0 && sc->vtnet_hdr_size % 4 == 0)
1578 clustersz -= VTNET_ETHER_ALIGN;
1579
1580 m_prev = NULL;
1581 m_tail = NULL;
1582 nreplace = 0;
1583
1584 m = m0;
1585 len = len0;
1586
1587 /*
1588 * Since these mbuf chains are so large, avoid allocating a complete
1589 * replacement when the received frame did not consume the entire
1590 * chain. Unused mbufs are moved to the tail of the replacement mbuf.
1591 */
1592 while (len > 0) {
1593 if (m == NULL) {
1594 sc->vtnet_stats.rx_frame_too_large++;
1595 return (EMSGSIZE);
1596 }
1597
1598 /*
1599 * Every mbuf should have the expected cluster size since that
1600 * is also used to allocate the replacements.
1601 */
1602 KASSERT(m->m_len == clustersz,
1603 ("%s: mbuf size %d not expected cluster size %d", __func__,
1604 m->m_len, clustersz));
1605
1606 m->m_len = MIN(m->m_len, len);
1607 len -= m->m_len;
1608
1609 m_prev = m;
1610 m = m->m_next;
1611 nreplace++;
1612 }
1613
1614 KASSERT(nreplace > 0 && nreplace <= sc->vtnet_rx_nmbufs,
1615 ("%s: invalid replacement mbuf count %d max %d", __func__,
1616 nreplace, sc->vtnet_rx_nmbufs));
1617
1618 m_new = vtnet_rx_alloc_buf(sc, nreplace, &m_tail);
1619 if (m_new == NULL) {
1620 m_prev->m_len = clustersz;
1621 return (ENOBUFS);
1622 }
1623
1624 /*
1625 * Move any unused mbufs from the received mbuf chain onto the
1626 * end of the replacement chain.
1627 */
1628 if (m_prev->m_next != NULL) {
1629 m_tail->m_next = m_prev->m_next;
1630 m_prev->m_next = NULL;
1631 }
1632
1633 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1634 if (error) {
1635 /*
1636 * The replacement is suppose to be an copy of the one
1637 * dequeued so this is a very unexpected error.
1638 *
1639 * Restore the m0 chain to the original state if it was
1640 * modified so we can then discard it.
1641 */
1642 if (m_tail->m_next != NULL) {
1643 m_prev->m_next = m_tail->m_next;
1644 m_tail->m_next = NULL;
1645 }
1646 m_prev->m_len = clustersz;
1647 sc->vtnet_stats.rx_enq_replacement_failed++;
1648 m_freem(m_new);
1649 }
1650
1651 return (error);
1652 }
1653
1654 static int
vtnet_rxq_replace_buf(struct vtnet_rxq * rxq,struct mbuf * m,int len)1655 vtnet_rxq_replace_buf(struct vtnet_rxq *rxq, struct mbuf *m, int len)
1656 {
1657 struct vtnet_softc *sc;
1658 struct mbuf *m_new;
1659 int error;
1660
1661 sc = rxq->vtnrx_sc;
1662
1663 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG)
1664 return (vtnet_rxq_replace_lro_nomrg_buf(rxq, m, len));
1665
1666 MPASS(m->m_next == NULL);
1667 if (m->m_len < len)
1668 return (EMSGSIZE);
1669
1670 m_new = vtnet_rx_alloc_buf(sc, 1, NULL);
1671 if (m_new == NULL)
1672 return (ENOBUFS);
1673
1674 error = vtnet_rxq_enqueue_buf(rxq, m_new);
1675 if (error) {
1676 sc->vtnet_stats.rx_enq_replacement_failed++;
1677 m_freem(m_new);
1678 } else
1679 m->m_len = len;
1680
1681 return (error);
1682 }
1683
1684 static int
vtnet_rxq_enqueue_buf(struct vtnet_rxq * rxq,struct mbuf * m)1685 vtnet_rxq_enqueue_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1686 {
1687 struct vtnet_softc *sc;
1688 struct sglist *sg;
1689 int header_inlined, error;
1690
1691 sc = rxq->vtnrx_sc;
1692 sg = rxq->vtnrx_sg;
1693
1694 KASSERT(m->m_next == NULL || sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG,
1695 ("%s: mbuf chain without LRO_NOMRG", __func__));
1696 VTNET_RXQ_LOCK_ASSERT(rxq);
1697
1698 sglist_reset(sg);
1699 header_inlined = vtnet_modern(sc) ||
1700 (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) != 0; /* TODO: ANY_LAYOUT */
1701
1702 /*
1703 * Note: The mbuf has been already adjusted when we allocate it if we
1704 * have to do strict alignment.
1705 */
1706 if (header_inlined)
1707 error = sglist_append_mbuf(sg, m);
1708 else {
1709 struct vtnet_rx_header *rxhdr =
1710 mtod(m, struct vtnet_rx_header *);
1711 MPASS(sc->vtnet_hdr_size == sizeof(struct virtio_net_hdr));
1712
1713 /* Append the header and remaining mbuf data. */
1714 error = sglist_append(sg, &rxhdr->vrh_hdr, sc->vtnet_hdr_size);
1715 if (error)
1716 return (error);
1717 error = sglist_append(sg, &rxhdr[1],
1718 m->m_len - sizeof(struct vtnet_rx_header));
1719 if (error)
1720 return (error);
1721
1722 if (m->m_next != NULL)
1723 error = sglist_append_mbuf(sg, m->m_next);
1724 }
1725
1726 if (error)
1727 return (error);
1728
1729 return (virtqueue_enqueue(rxq->vtnrx_vq, m, sg, 0, sg->sg_nseg));
1730 }
1731
1732 static int
vtnet_rxq_new_buf(struct vtnet_rxq * rxq)1733 vtnet_rxq_new_buf(struct vtnet_rxq *rxq)
1734 {
1735 struct vtnet_softc *sc;
1736 struct mbuf *m;
1737 int error;
1738
1739 sc = rxq->vtnrx_sc;
1740
1741 m = vtnet_rx_alloc_buf(sc, sc->vtnet_rx_nmbufs, NULL);
1742 if (m == NULL)
1743 return (ENOBUFS);
1744
1745 error = vtnet_rxq_enqueue_buf(rxq, m);
1746 if (error)
1747 m_freem(m);
1748
1749 return (error);
1750 }
1751
1752 static int
vtnet_rxq_csum_needs_csum(struct vtnet_rxq * rxq,struct mbuf * m,uint16_t etype,int hoff,struct virtio_net_hdr * hdr)1753 vtnet_rxq_csum_needs_csum(struct vtnet_rxq *rxq, struct mbuf *m, uint16_t etype,
1754 int hoff, struct virtio_net_hdr *hdr)
1755 {
1756 struct vtnet_softc *sc;
1757 int error;
1758
1759 sc = rxq->vtnrx_sc;
1760
1761 /*
1762 * NEEDS_CSUM corresponds to Linux's CHECKSUM_PARTIAL, but FreeBSD does
1763 * not have an analogous CSUM flag. The checksum has been validated,
1764 * but is incomplete (TCP/UDP pseudo header).
1765 *
1766 * The packet is likely from another VM on the same host that itself
1767 * performed checksum offloading so Tx/Rx is basically a memcpy and
1768 * the checksum has little value.
1769 *
1770 * Default to receiving the packet as-is for performance reasons, but
1771 * this can cause issues if the packet is to be forwarded because it
1772 * does not contain a valid checksum. This patch may be helpful:
1773 * https://reviews.freebsd.org/D6611. In the meantime, have the driver
1774 * compute the checksum if requested.
1775 *
1776 * BMV: Need to add an CSUM_PARTIAL flag?
1777 */
1778 if ((sc->vtnet_flags & VTNET_FLAG_FIXUP_NEEDS_CSUM) == 0) {
1779 error = vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr);
1780 return (error);
1781 }
1782
1783 /*
1784 * Compute the checksum in the driver so the packet will contain a
1785 * valid checksum. The checksum is at csum_offset from csum_start.
1786 */
1787 switch (etype) {
1788 #if defined(INET) || defined(INET6)
1789 case ETHERTYPE_IP:
1790 case ETHERTYPE_IPV6: {
1791 int csum_off, csum_end;
1792 uint16_t csum;
1793
1794 csum_off = hdr->csum_start + hdr->csum_offset;
1795 csum_end = csum_off + sizeof(uint16_t);
1796
1797 /* Assume checksum will be in the first mbuf. */
1798 if (m->m_len < csum_end || m->m_pkthdr.len < csum_end)
1799 return (1);
1800
1801 /*
1802 * Like in_delayed_cksum()/in6_delayed_cksum(), compute the
1803 * checksum and write it at the specified offset. We could
1804 * try to verify the packet: csum_start should probably
1805 * correspond to the start of the TCP/UDP header.
1806 *
1807 * BMV: Need to properly handle UDP with zero checksum. Is
1808 * the IPv4 header checksum implicitly validated?
1809 */
1810 csum = in_cksum_skip(m, m->m_pkthdr.len, hdr->csum_start);
1811 *(uint16_t *)(mtodo(m, csum_off)) = csum;
1812 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1813 m->m_pkthdr.csum_data = 0xFFFF;
1814 break;
1815 }
1816 #endif
1817 default:
1818 sc->vtnet_stats.rx_csum_bad_ethtype++;
1819 return (1);
1820 }
1821
1822 return (0);
1823 }
1824
1825 static int
vtnet_rxq_csum_data_valid(struct vtnet_rxq * rxq,struct mbuf * m,uint16_t etype,int hoff,struct virtio_net_hdr * hdr __unused)1826 vtnet_rxq_csum_data_valid(struct vtnet_rxq *rxq, struct mbuf *m,
1827 uint16_t etype, int hoff, struct virtio_net_hdr *hdr __unused)
1828 {
1829 #if 0
1830 struct vtnet_softc *sc;
1831 #endif
1832 int protocol;
1833
1834 #if 0
1835 sc = rxq->vtnrx_sc;
1836 #endif
1837
1838 switch (etype) {
1839 #if defined(INET)
1840 case ETHERTYPE_IP:
1841 if (__predict_false(m->m_len < hoff + sizeof(struct ip)))
1842 protocol = IPPROTO_DONE;
1843 else {
1844 struct ip *ip = (struct ip *)(m->m_data + hoff);
1845 protocol = ip->ip_p;
1846 }
1847 break;
1848 #endif
1849 #if defined(INET6)
1850 case ETHERTYPE_IPV6:
1851 if (__predict_false(m->m_len < hoff + sizeof(struct ip6_hdr))
1852 || ip6_lasthdr(m, hoff, IPPROTO_IPV6, &protocol) < 0)
1853 protocol = IPPROTO_DONE;
1854 break;
1855 #endif
1856 default:
1857 protocol = IPPROTO_DONE;
1858 break;
1859 }
1860
1861 switch (protocol) {
1862 case IPPROTO_TCP:
1863 case IPPROTO_UDP:
1864 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
1865 m->m_pkthdr.csum_data = 0xFFFF;
1866 break;
1867 default:
1868 /*
1869 * FreeBSD does not support checksum offloading of this
1870 * protocol. Let the stack re-verify the checksum later
1871 * if the protocol is supported.
1872 */
1873 #if 0
1874 if_printf(sc->vtnet_ifp,
1875 "%s: checksum offload of unsupported protocol "
1876 "etype=%#x protocol=%d csum_start=%d csum_offset=%d\n",
1877 __func__, etype, protocol, hdr->csum_start,
1878 hdr->csum_offset);
1879 #endif
1880 break;
1881 }
1882
1883 return (0);
1884 }
1885
1886 static int
vtnet_rxq_csum(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)1887 vtnet_rxq_csum(struct vtnet_rxq *rxq, struct mbuf *m,
1888 struct virtio_net_hdr *hdr)
1889 {
1890 const struct ether_header *eh;
1891 int hoff;
1892 uint16_t etype;
1893
1894 eh = mtod(m, const struct ether_header *);
1895 etype = ntohs(eh->ether_type);
1896 if (etype == ETHERTYPE_VLAN) {
1897 /* TODO BMV: Handle QinQ. */
1898 const struct ether_vlan_header *evh =
1899 mtod(m, const struct ether_vlan_header *);
1900 etype = ntohs(evh->evl_proto);
1901 hoff = sizeof(struct ether_vlan_header);
1902 } else
1903 hoff = sizeof(struct ether_header);
1904
1905 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
1906 return (vtnet_rxq_csum_needs_csum(rxq, m, etype, hoff, hdr));
1907 else /* VIRTIO_NET_HDR_F_DATA_VALID */
1908 return (vtnet_rxq_csum_data_valid(rxq, m, etype, hoff, hdr));
1909 }
1910
1911 static void
vtnet_rxq_discard_merged_bufs(struct vtnet_rxq * rxq,int nbufs)1912 vtnet_rxq_discard_merged_bufs(struct vtnet_rxq *rxq, int nbufs)
1913 {
1914 struct mbuf *m;
1915
1916 while (--nbufs > 0) {
1917 m = virtqueue_dequeue(rxq->vtnrx_vq, NULL);
1918 if (m == NULL)
1919 break;
1920 vtnet_rxq_discard_buf(rxq, m);
1921 }
1922 }
1923
1924 static void
vtnet_rxq_discard_buf(struct vtnet_rxq * rxq,struct mbuf * m)1925 vtnet_rxq_discard_buf(struct vtnet_rxq *rxq, struct mbuf *m)
1926 {
1927 int error __diagused;
1928
1929 /*
1930 * Requeue the discarded mbuf. This should always be successful
1931 * since it was just dequeued.
1932 */
1933 error = vtnet_rxq_enqueue_buf(rxq, m);
1934 KASSERT(error == 0,
1935 ("%s: cannot requeue discarded mbuf %d", __func__, error));
1936 }
1937
1938 static int
vtnet_rxq_merged_eof(struct vtnet_rxq * rxq,struct mbuf * m_head,int nbufs)1939 vtnet_rxq_merged_eof(struct vtnet_rxq *rxq, struct mbuf *m_head, int nbufs)
1940 {
1941 struct vtnet_softc *sc;
1942 struct virtqueue *vq;
1943 struct mbuf *m_tail;
1944
1945 sc = rxq->vtnrx_sc;
1946 vq = rxq->vtnrx_vq;
1947 m_tail = m_head;
1948
1949 while (--nbufs > 0) {
1950 struct mbuf *m;
1951 uint32_t len;
1952
1953 m = virtqueue_dequeue(vq, &len);
1954 if (m == NULL) {
1955 rxq->vtnrx_stats.vrxs_ierrors++;
1956 goto fail;
1957 }
1958
1959 if (vtnet_rxq_new_buf(rxq) != 0) {
1960 rxq->vtnrx_stats.vrxs_iqdrops++;
1961 vtnet_rxq_discard_buf(rxq, m);
1962 if (nbufs > 1)
1963 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
1964 goto fail;
1965 }
1966
1967 if (m->m_len < len)
1968 len = m->m_len;
1969
1970 m->m_len = len;
1971 m->m_flags &= ~M_PKTHDR;
1972
1973 m_head->m_pkthdr.len += len;
1974 m_tail->m_next = m;
1975 m_tail = m;
1976 }
1977
1978 return (0);
1979
1980 fail:
1981 sc->vtnet_stats.rx_mergeable_failed++;
1982 m_freem(m_head);
1983
1984 return (1);
1985 }
1986
1987 #if defined(INET) || defined(INET6)
1988 static int
vtnet_lro_rx(struct vtnet_rxq * rxq,struct mbuf * m)1989 vtnet_lro_rx(struct vtnet_rxq *rxq, struct mbuf *m)
1990 {
1991 struct lro_ctrl *lro;
1992
1993 lro = &rxq->vtnrx_lro;
1994
1995 if (lro->lro_mbuf_max != 0) {
1996 tcp_lro_queue_mbuf(lro, m);
1997 return (0);
1998 }
1999
2000 return (tcp_lro_rx(lro, m, 0));
2001 }
2002 #endif
2003
2004 static void
vtnet_rxq_input(struct vtnet_rxq * rxq,struct mbuf * m,struct virtio_net_hdr * hdr)2005 vtnet_rxq_input(struct vtnet_rxq *rxq, struct mbuf *m,
2006 struct virtio_net_hdr *hdr)
2007 {
2008 struct vtnet_softc *sc;
2009 if_t ifp;
2010
2011 sc = rxq->vtnrx_sc;
2012 ifp = sc->vtnet_ifp;
2013
2014 if (if_getcapenable(ifp) & IFCAP_VLAN_HWTAGGING) {
2015 struct ether_header *eh = mtod(m, struct ether_header *);
2016 if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
2017 vtnet_vlan_tag_remove(m);
2018 /*
2019 * With the 802.1Q header removed, update the
2020 * checksum starting location accordingly.
2021 */
2022 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
2023 hdr->csum_start -= ETHER_VLAN_ENCAP_LEN;
2024 }
2025 }
2026
2027 m->m_pkthdr.flowid = rxq->vtnrx_id;
2028 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE);
2029
2030 if (hdr->flags &
2031 (VIRTIO_NET_HDR_F_NEEDS_CSUM | VIRTIO_NET_HDR_F_DATA_VALID)) {
2032 if (vtnet_rxq_csum(rxq, m, hdr) == 0)
2033 rxq->vtnrx_stats.vrxs_csum++;
2034 else
2035 rxq->vtnrx_stats.vrxs_csum_failed++;
2036 }
2037
2038 if (hdr->gso_size != 0) {
2039 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2040 case VIRTIO_NET_HDR_GSO_TCPV4:
2041 case VIRTIO_NET_HDR_GSO_TCPV6:
2042 m->m_pkthdr.lro_nsegs =
2043 howmany(m->m_pkthdr.len, hdr->gso_size);
2044 rxq->vtnrx_stats.vrxs_host_lro++;
2045 break;
2046 }
2047 }
2048
2049 rxq->vtnrx_stats.vrxs_ipackets++;
2050 rxq->vtnrx_stats.vrxs_ibytes += m->m_pkthdr.len;
2051
2052 #if defined(INET) || defined(INET6)
2053 if (vtnet_software_lro(sc) && if_getcapenable(ifp) & IFCAP_LRO) {
2054 if (vtnet_lro_rx(rxq, m) == 0)
2055 return;
2056 }
2057 #endif
2058
2059 if_input(ifp, m);
2060 }
2061
2062 static int
vtnet_rxq_eof(struct vtnet_rxq * rxq)2063 vtnet_rxq_eof(struct vtnet_rxq *rxq)
2064 {
2065 struct virtio_net_hdr lhdr, *hdr;
2066 struct vtnet_softc *sc;
2067 if_t ifp;
2068 struct virtqueue *vq;
2069 int deq, count;
2070
2071 sc = rxq->vtnrx_sc;
2072 vq = rxq->vtnrx_vq;
2073 ifp = sc->vtnet_ifp;
2074 deq = 0;
2075 count = sc->vtnet_rx_process_limit;
2076
2077 VTNET_RXQ_LOCK_ASSERT(rxq);
2078
2079 CURVNET_SET(if_getvnet(ifp));
2080 while (count-- > 0) {
2081 struct mbuf *m;
2082 uint32_t len, nbufs, adjsz;
2083
2084 m = virtqueue_dequeue(vq, &len);
2085 if (m == NULL)
2086 break;
2087 deq++;
2088
2089 if (len < sc->vtnet_hdr_size + ETHER_HDR_LEN) {
2090 rxq->vtnrx_stats.vrxs_ierrors++;
2091 vtnet_rxq_discard_buf(rxq, m);
2092 continue;
2093 }
2094
2095 if (sc->vtnet_flags & VTNET_FLAG_MRG_RXBUFS) {
2096 struct virtio_net_hdr_mrg_rxbuf *mhdr =
2097 mtod(m, struct virtio_net_hdr_mrg_rxbuf *);
2098 kmsan_mark(mhdr, sizeof(*mhdr), KMSAN_STATE_INITED);
2099 nbufs = vtnet_htog16(sc, mhdr->num_buffers);
2100 adjsz = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2101 } else if (vtnet_modern(sc)) {
2102 nbufs = 1; /* num_buffers is always 1 */
2103 adjsz = sizeof(struct virtio_net_hdr_v1);
2104 } else {
2105 nbufs = 1;
2106 adjsz = sizeof(struct vtnet_rx_header);
2107 /*
2108 * Account for our gap between the header and start of
2109 * data to keep the segments separated.
2110 */
2111 len += VTNET_RX_HEADER_PAD;
2112 }
2113
2114 if (vtnet_rxq_replace_buf(rxq, m, len) != 0) {
2115 rxq->vtnrx_stats.vrxs_iqdrops++;
2116 vtnet_rxq_discard_buf(rxq, m);
2117 if (nbufs > 1)
2118 vtnet_rxq_discard_merged_bufs(rxq, nbufs);
2119 continue;
2120 }
2121
2122 m->m_pkthdr.len = len;
2123 m->m_pkthdr.rcvif = ifp;
2124 m->m_pkthdr.csum_flags = 0;
2125
2126 if (nbufs > 1) {
2127 /* Dequeue the rest of chain. */
2128 if (vtnet_rxq_merged_eof(rxq, m, nbufs) != 0)
2129 continue;
2130 }
2131
2132 kmsan_mark_mbuf(m, KMSAN_STATE_INITED);
2133
2134 /*
2135 * Save an endian swapped version of the header prior to it
2136 * being stripped. The header is always at the start of the
2137 * mbuf data. num_buffers was already saved (and not needed)
2138 * so use the standard header.
2139 */
2140 hdr = mtod(m, struct virtio_net_hdr *);
2141 lhdr.flags = hdr->flags;
2142 lhdr.gso_type = hdr->gso_type;
2143 lhdr.hdr_len = vtnet_htog16(sc, hdr->hdr_len);
2144 lhdr.gso_size = vtnet_htog16(sc, hdr->gso_size);
2145 lhdr.csum_start = vtnet_htog16(sc, hdr->csum_start);
2146 lhdr.csum_offset = vtnet_htog16(sc, hdr->csum_offset);
2147 m_adj(m, adjsz);
2148
2149 if (PFIL_HOOKED_IN(sc->vtnet_pfil)) {
2150 pfil_return_t pfil;
2151
2152 pfil = pfil_mbuf_in(sc->vtnet_pfil, &m, ifp, NULL);
2153 switch (pfil) {
2154 case PFIL_DROPPED:
2155 case PFIL_CONSUMED:
2156 continue;
2157 default:
2158 KASSERT(pfil == PFIL_PASS,
2159 ("Filter returned %d!", pfil));
2160 }
2161 }
2162
2163 vtnet_rxq_input(rxq, m, &lhdr);
2164 }
2165
2166 if (deq > 0) {
2167 #if defined(INET) || defined(INET6)
2168 if (vtnet_software_lro(sc))
2169 tcp_lro_flush_all(&rxq->vtnrx_lro);
2170 #endif
2171 virtqueue_notify(vq);
2172 }
2173 CURVNET_RESTORE();
2174
2175 return (count > 0 ? 0 : EAGAIN);
2176 }
2177
2178 static void
vtnet_rx_vq_process(struct vtnet_rxq * rxq,int tries)2179 vtnet_rx_vq_process(struct vtnet_rxq *rxq, int tries)
2180 {
2181 struct vtnet_softc *sc;
2182 if_t ifp;
2183 u_int more;
2184 #ifdef DEV_NETMAP
2185 int nmirq;
2186 #endif /* DEV_NETMAP */
2187
2188 sc = rxq->vtnrx_sc;
2189 ifp = sc->vtnet_ifp;
2190
2191 if (__predict_false(rxq->vtnrx_id >= sc->vtnet_act_vq_pairs)) {
2192 /*
2193 * Ignore this interrupt. Either this is a spurious interrupt
2194 * or multiqueue without per-VQ MSIX so every queue needs to
2195 * be polled (a brain dead configuration we could try harder
2196 * to avoid).
2197 */
2198 vtnet_rxq_disable_intr(rxq);
2199 return;
2200 }
2201
2202 VTNET_RXQ_LOCK(rxq);
2203
2204 #ifdef DEV_NETMAP
2205 /*
2206 * We call netmap_rx_irq() under lock to prevent concurrent calls.
2207 * This is not necessary to serialize the access to the RX vq, but
2208 * rather to avoid races that may happen if this interface is
2209 * attached to a VALE switch, which would cause received packets
2210 * to stall in the RX queue (nm_kr_tryget() could find the kring
2211 * busy when called from netmap_bwrap_intr_notify()).
2212 */
2213 nmirq = netmap_rx_irq(ifp, rxq->vtnrx_id, &more);
2214 if (nmirq != NM_IRQ_PASS) {
2215 VTNET_RXQ_UNLOCK(rxq);
2216 if (nmirq == NM_IRQ_RESCHED) {
2217 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2218 }
2219 return;
2220 }
2221 #endif /* DEV_NETMAP */
2222
2223 again:
2224 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2225 VTNET_RXQ_UNLOCK(rxq);
2226 return;
2227 }
2228
2229 more = vtnet_rxq_eof(rxq);
2230 if (more || vtnet_rxq_enable_intr(rxq) != 0) {
2231 if (!more)
2232 vtnet_rxq_disable_intr(rxq);
2233 /*
2234 * This is an occasional condition or race (when !more),
2235 * so retry a few times before scheduling the taskqueue.
2236 */
2237 if (tries-- > 0)
2238 goto again;
2239
2240 rxq->vtnrx_stats.vrxs_rescheduled++;
2241 VTNET_RXQ_UNLOCK(rxq);
2242 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
2243 } else
2244 VTNET_RXQ_UNLOCK(rxq);
2245 }
2246
2247 static void
vtnet_rx_vq_intr(void * xrxq)2248 vtnet_rx_vq_intr(void *xrxq)
2249 {
2250 struct vtnet_rxq *rxq;
2251
2252 rxq = xrxq;
2253 vtnet_rx_vq_process(rxq, VTNET_INTR_DISABLE_RETRIES);
2254 }
2255
2256 static void
vtnet_rxq_tq_intr(void * xrxq,int pending __unused)2257 vtnet_rxq_tq_intr(void *xrxq, int pending __unused)
2258 {
2259 struct vtnet_rxq *rxq;
2260
2261 rxq = xrxq;
2262 vtnet_rx_vq_process(rxq, 0);
2263 }
2264
2265 static int
vtnet_txq_intr_threshold(struct vtnet_txq * txq)2266 vtnet_txq_intr_threshold(struct vtnet_txq *txq)
2267 {
2268 struct vtnet_softc *sc;
2269 int threshold;
2270
2271 sc = txq->vtntx_sc;
2272
2273 /*
2274 * The Tx interrupt is disabled until the queue free count falls
2275 * below our threshold. Completed frames are drained from the Tx
2276 * virtqueue before transmitting new frames and in the watchdog
2277 * callout, so the frequency of Tx interrupts is greatly reduced,
2278 * at the cost of not freeing mbufs as quickly as they otherwise
2279 * would be.
2280 */
2281 threshold = virtqueue_size(txq->vtntx_vq) / 4;
2282
2283 /*
2284 * Without indirect descriptors, leave enough room for the most
2285 * segments we handle.
2286 */
2287 if ((sc->vtnet_flags & VTNET_FLAG_INDIRECT) == 0 &&
2288 threshold < sc->vtnet_tx_nsegs)
2289 threshold = sc->vtnet_tx_nsegs;
2290
2291 return (threshold);
2292 }
2293
2294 static int
vtnet_txq_below_threshold(struct vtnet_txq * txq)2295 vtnet_txq_below_threshold(struct vtnet_txq *txq)
2296 {
2297 struct virtqueue *vq;
2298
2299 vq = txq->vtntx_vq;
2300
2301 return (virtqueue_nfree(vq) <= txq->vtntx_intr_threshold);
2302 }
2303
2304 static int
vtnet_txq_notify(struct vtnet_txq * txq)2305 vtnet_txq_notify(struct vtnet_txq *txq)
2306 {
2307 struct virtqueue *vq;
2308
2309 vq = txq->vtntx_vq;
2310
2311 txq->vtntx_watchdog = VTNET_TX_TIMEOUT;
2312 virtqueue_notify(vq);
2313
2314 if (vtnet_txq_enable_intr(txq) == 0)
2315 return (0);
2316
2317 /*
2318 * Drain frames that were completed since last checked. If this
2319 * causes the queue to go above the threshold, the caller should
2320 * continue transmitting.
2321 */
2322 if (vtnet_txq_eof(txq) != 0 && vtnet_txq_below_threshold(txq) == 0) {
2323 virtqueue_disable_intr(vq);
2324 return (1);
2325 }
2326
2327 return (0);
2328 }
2329
2330 static void
vtnet_txq_free_mbufs(struct vtnet_txq * txq)2331 vtnet_txq_free_mbufs(struct vtnet_txq *txq)
2332 {
2333 struct virtqueue *vq;
2334 struct vtnet_tx_header *txhdr;
2335 int last;
2336 #ifdef DEV_NETMAP
2337 struct netmap_kring *kring = netmap_kring_on(NA(txq->vtntx_sc->vtnet_ifp),
2338 txq->vtntx_id, NR_TX);
2339 #else /* !DEV_NETMAP */
2340 void *kring = NULL;
2341 #endif /* !DEV_NETMAP */
2342
2343 vq = txq->vtntx_vq;
2344 last = 0;
2345
2346 while ((txhdr = virtqueue_drain(vq, &last)) != NULL) {
2347 if (kring == NULL) {
2348 m_freem(txhdr->vth_mbuf);
2349 uma_zfree(vtnet_tx_header_zone, txhdr);
2350 }
2351 }
2352
2353 KASSERT(virtqueue_empty(vq),
2354 ("%s: mbufs remaining in tx queue %p", __func__, txq));
2355 }
2356
2357 /*
2358 * BMV: This can go away once we finally have offsets in the mbuf header.
2359 */
2360 static int
vtnet_txq_offload_ctx(struct vtnet_txq * txq,struct mbuf * m,int * etype,int * proto,int * start)2361 vtnet_txq_offload_ctx(struct vtnet_txq *txq, struct mbuf *m, int *etype,
2362 int *proto, int *start)
2363 {
2364 struct vtnet_softc *sc;
2365 struct ether_vlan_header *evh;
2366 #if defined(INET) || defined(INET6)
2367 int offset;
2368 #endif
2369
2370 sc = txq->vtntx_sc;
2371
2372 evh = mtod(m, struct ether_vlan_header *);
2373 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
2374 /* BMV: We should handle nested VLAN tags too. */
2375 *etype = ntohs(evh->evl_proto);
2376 #if defined(INET) || defined(INET6)
2377 offset = sizeof(struct ether_vlan_header);
2378 #endif
2379 } else {
2380 *etype = ntohs(evh->evl_encap_proto);
2381 #if defined(INET) || defined(INET6)
2382 offset = sizeof(struct ether_header);
2383 #endif
2384 }
2385
2386 switch (*etype) {
2387 #if defined(INET)
2388 case ETHERTYPE_IP: {
2389 struct ip *ip, iphdr;
2390 if (__predict_false(m->m_len < offset + sizeof(struct ip))) {
2391 m_copydata(m, offset, sizeof(struct ip),
2392 (caddr_t) &iphdr);
2393 ip = &iphdr;
2394 } else
2395 ip = (struct ip *)(m->m_data + offset);
2396 *proto = ip->ip_p;
2397 *start = offset + (ip->ip_hl << 2);
2398 break;
2399 }
2400 #endif
2401 #if defined(INET6)
2402 case ETHERTYPE_IPV6:
2403 *proto = -1;
2404 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto);
2405 /* Assert the network stack sent us a valid packet. */
2406 KASSERT(*start > offset,
2407 ("%s: mbuf %p start %d offset %d proto %d", __func__, m,
2408 *start, offset, *proto));
2409 break;
2410 #endif
2411 default:
2412 sc->vtnet_stats.tx_csum_unknown_ethtype++;
2413 return (EINVAL);
2414 }
2415
2416 return (0);
2417 }
2418
2419 static int
vtnet_txq_offload_tso(struct vtnet_txq * txq,struct mbuf * m,int eth_type,int offset,struct virtio_net_hdr * hdr)2420 vtnet_txq_offload_tso(struct vtnet_txq *txq, struct mbuf *m, int eth_type,
2421 int offset, struct virtio_net_hdr *hdr)
2422 {
2423 static struct timeval lastecn;
2424 static int curecn;
2425 struct vtnet_softc *sc;
2426 struct tcphdr *tcp, tcphdr;
2427
2428 sc = txq->vtntx_sc;
2429
2430 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) {
2431 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr);
2432 tcp = &tcphdr;
2433 } else
2434 tcp = (struct tcphdr *)(m->m_data + offset);
2435
2436 hdr->hdr_len = vtnet_gtoh16(sc, offset + (tcp->th_off << 2));
2437 hdr->gso_size = vtnet_gtoh16(sc, m->m_pkthdr.tso_segsz);
2438 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 :
2439 VIRTIO_NET_HDR_GSO_TCPV6;
2440
2441 if (__predict_false(tcp_get_flags(tcp) & TH_CWR)) {
2442 /*
2443 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In
2444 * FreeBSD, ECN support is not on a per-interface basis,
2445 * but globally via the net.inet.tcp.ecn.enable sysctl
2446 * knob. The default is off.
2447 */
2448 if ((sc->vtnet_flags & VTNET_FLAG_TSO_ECN) == 0) {
2449 if (ppsratecheck(&lastecn, &curecn, 1))
2450 if_printf(sc->vtnet_ifp,
2451 "TSO with ECN not negotiated with host\n");
2452 return (ENOTSUP);
2453 }
2454 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
2455 }
2456
2457 txq->vtntx_stats.vtxs_tso++;
2458
2459 return (0);
2460 }
2461
2462 static struct mbuf *
vtnet_txq_offload(struct vtnet_txq * txq,struct mbuf * m,struct virtio_net_hdr * hdr)2463 vtnet_txq_offload(struct vtnet_txq *txq, struct mbuf *m,
2464 struct virtio_net_hdr *hdr)
2465 {
2466 struct vtnet_softc *sc;
2467 int flags, etype, csum_start, proto, error;
2468
2469 sc = txq->vtntx_sc;
2470 flags = m->m_pkthdr.csum_flags;
2471
2472 error = vtnet_txq_offload_ctx(txq, m, &etype, &proto, &csum_start);
2473 if (error)
2474 goto drop;
2475
2476 if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) {
2477 /* Sanity check the parsed mbuf matches the offload flags. */
2478 if (__predict_false((flags & VTNET_CSUM_OFFLOAD &&
2479 etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6
2480 && etype != ETHERTYPE_IPV6))) {
2481 sc->vtnet_stats.tx_csum_proto_mismatch++;
2482 goto drop;
2483 }
2484
2485 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM;
2486 hdr->csum_start = vtnet_gtoh16(sc, csum_start);
2487 hdr->csum_offset = vtnet_gtoh16(sc, m->m_pkthdr.csum_data);
2488 txq->vtntx_stats.vtxs_csum++;
2489 }
2490
2491 if (flags & (CSUM_IP_TSO | CSUM_IP6_TSO)) {
2492 /*
2493 * Sanity check the parsed mbuf IP protocol is TCP, and
2494 * VirtIO TSO reqires the checksum offloading above.
2495 */
2496 if (__predict_false(proto != IPPROTO_TCP)) {
2497 sc->vtnet_stats.tx_tso_not_tcp++;
2498 goto drop;
2499 } else if (__predict_false((hdr->flags &
2500 VIRTIO_NET_HDR_F_NEEDS_CSUM) == 0)) {
2501 sc->vtnet_stats.tx_tso_without_csum++;
2502 goto drop;
2503 }
2504
2505 error = vtnet_txq_offload_tso(txq, m, etype, csum_start, hdr);
2506 if (error)
2507 goto drop;
2508 }
2509
2510 return (m);
2511
2512 drop:
2513 m_freem(m);
2514 return (NULL);
2515 }
2516
2517 static int
vtnet_txq_enqueue_buf(struct vtnet_txq * txq,struct mbuf ** m_head,struct vtnet_tx_header * txhdr)2518 vtnet_txq_enqueue_buf(struct vtnet_txq *txq, struct mbuf **m_head,
2519 struct vtnet_tx_header *txhdr)
2520 {
2521 struct vtnet_softc *sc;
2522 struct virtqueue *vq;
2523 struct sglist *sg;
2524 struct mbuf *m;
2525 int error;
2526
2527 sc = txq->vtntx_sc;
2528 vq = txq->vtntx_vq;
2529 sg = txq->vtntx_sg;
2530 m = *m_head;
2531
2532 sglist_reset(sg);
2533 error = sglist_append(sg, &txhdr->vth_uhdr, sc->vtnet_hdr_size);
2534 if (error != 0 || sg->sg_nseg != 1) {
2535 KASSERT(0, ("%s: cannot add header to sglist error %d nseg %d",
2536 __func__, error, sg->sg_nseg));
2537 goto fail;
2538 }
2539
2540 error = sglist_append_mbuf(sg, m);
2541 if (error) {
2542 m = m_defrag(m, M_NOWAIT);
2543 if (m == NULL)
2544 goto fail;
2545
2546 *m_head = m;
2547 sc->vtnet_stats.tx_defragged++;
2548
2549 error = sglist_append_mbuf(sg, m);
2550 if (error)
2551 goto fail;
2552 }
2553
2554 txhdr->vth_mbuf = m;
2555 error = virtqueue_enqueue(vq, txhdr, sg, sg->sg_nseg, 0);
2556
2557 return (error);
2558
2559 fail:
2560 sc->vtnet_stats.tx_defrag_failed++;
2561 m_freem(*m_head);
2562 *m_head = NULL;
2563
2564 return (ENOBUFS);
2565 }
2566
2567 static int
vtnet_txq_encap(struct vtnet_txq * txq,struct mbuf ** m_head,int flags)2568 vtnet_txq_encap(struct vtnet_txq *txq, struct mbuf **m_head, int flags)
2569 {
2570 struct vtnet_tx_header *txhdr;
2571 struct virtio_net_hdr *hdr;
2572 struct mbuf *m;
2573 int error;
2574
2575 m = *m_head;
2576 M_ASSERTPKTHDR(m);
2577
2578 txhdr = uma_zalloc(vtnet_tx_header_zone, flags | M_ZERO);
2579 if (txhdr == NULL) {
2580 m_freem(m);
2581 *m_head = NULL;
2582 return (ENOMEM);
2583 }
2584
2585 /*
2586 * Always use the non-mergeable header, regardless if mergable headers
2587 * were negotiated, because for transmit num_buffers is always zero.
2588 * The vtnet_hdr_size is used to enqueue the right header size segment.
2589 */
2590 hdr = &txhdr->vth_uhdr.hdr;
2591
2592 if (m->m_flags & M_VLANTAG) {
2593 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag);
2594 if ((*m_head = m) == NULL) {
2595 error = ENOBUFS;
2596 goto fail;
2597 }
2598 m->m_flags &= ~M_VLANTAG;
2599 }
2600
2601 if (m->m_pkthdr.csum_flags & VTNET_CSUM_ALL_OFFLOAD) {
2602 m = vtnet_txq_offload(txq, m, hdr);
2603 if ((*m_head = m) == NULL) {
2604 error = ENOBUFS;
2605 goto fail;
2606 }
2607 }
2608
2609 error = vtnet_txq_enqueue_buf(txq, m_head, txhdr);
2610 fail:
2611 if (error)
2612 uma_zfree(vtnet_tx_header_zone, txhdr);
2613
2614 return (error);
2615 }
2616
2617 #ifdef VTNET_LEGACY_TX
2618
2619 static void
vtnet_start_locked(struct vtnet_txq * txq,if_t ifp)2620 vtnet_start_locked(struct vtnet_txq *txq, if_t ifp)
2621 {
2622 struct vtnet_softc *sc;
2623 struct virtqueue *vq;
2624 struct mbuf *m0;
2625 int tries, enq;
2626
2627 sc = txq->vtntx_sc;
2628 vq = txq->vtntx_vq;
2629 tries = 0;
2630
2631 VTNET_TXQ_LOCK_ASSERT(txq);
2632
2633 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 ||
2634 sc->vtnet_link_active == 0)
2635 return;
2636
2637 vtnet_txq_eof(txq);
2638
2639 again:
2640 enq = 0;
2641
2642 while (!if_sendq_empty(ifp)) {
2643 if (virtqueue_full(vq))
2644 break;
2645
2646 m0 = if_dequeue(ifp);
2647 if (m0 == NULL)
2648 break;
2649
2650 if (vtnet_txq_encap(txq, &m0, M_NOWAIT) != 0) {
2651 if (m0 != NULL)
2652 if_sendq_prepend(ifp, m0);
2653 break;
2654 }
2655
2656 enq++;
2657 ETHER_BPF_MTAP(ifp, m0);
2658 }
2659
2660 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2661 if (tries++ < VTNET_NOTIFY_RETRIES)
2662 goto again;
2663
2664 txq->vtntx_stats.vtxs_rescheduled++;
2665 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2666 }
2667 }
2668
2669 static void
vtnet_start(if_t ifp)2670 vtnet_start(if_t ifp)
2671 {
2672 struct vtnet_softc *sc;
2673 struct vtnet_txq *txq;
2674
2675 sc = if_getsoftc(ifp);
2676 txq = &sc->vtnet_txqs[0];
2677
2678 VTNET_TXQ_LOCK(txq);
2679 vtnet_start_locked(txq, ifp);
2680 VTNET_TXQ_UNLOCK(txq);
2681 }
2682
2683 #else /* !VTNET_LEGACY_TX */
2684
2685 static int
vtnet_txq_mq_start_locked(struct vtnet_txq * txq,struct mbuf * m)2686 vtnet_txq_mq_start_locked(struct vtnet_txq *txq, struct mbuf *m)
2687 {
2688 struct vtnet_softc *sc;
2689 struct virtqueue *vq;
2690 struct buf_ring *br;
2691 if_t ifp;
2692 int enq, tries, error;
2693
2694 sc = txq->vtntx_sc;
2695 vq = txq->vtntx_vq;
2696 br = txq->vtntx_br;
2697 ifp = sc->vtnet_ifp;
2698 tries = 0;
2699 error = 0;
2700
2701 VTNET_TXQ_LOCK_ASSERT(txq);
2702
2703 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0 ||
2704 sc->vtnet_link_active == 0) {
2705 if (m != NULL)
2706 error = drbr_enqueue(ifp, br, m);
2707 return (error);
2708 }
2709
2710 if (m != NULL) {
2711 error = drbr_enqueue(ifp, br, m);
2712 if (error)
2713 return (error);
2714 }
2715
2716 vtnet_txq_eof(txq);
2717
2718 again:
2719 enq = 0;
2720
2721 while ((m = drbr_peek(ifp, br)) != NULL) {
2722 if (virtqueue_full(vq)) {
2723 drbr_putback(ifp, br, m);
2724 break;
2725 }
2726
2727 if (vtnet_txq_encap(txq, &m, M_NOWAIT) != 0) {
2728 if (m != NULL)
2729 drbr_putback(ifp, br, m);
2730 else
2731 drbr_advance(ifp, br);
2732 break;
2733 }
2734 drbr_advance(ifp, br);
2735
2736 enq++;
2737 ETHER_BPF_MTAP(ifp, m);
2738 }
2739
2740 if (enq > 0 && vtnet_txq_notify(txq) != 0) {
2741 if (tries++ < VTNET_NOTIFY_RETRIES)
2742 goto again;
2743
2744 txq->vtntx_stats.vtxs_rescheduled++;
2745 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_intrtask);
2746 }
2747
2748 return (0);
2749 }
2750
2751 static int
vtnet_txq_mq_start(if_t ifp,struct mbuf * m)2752 vtnet_txq_mq_start(if_t ifp, struct mbuf *m)
2753 {
2754 struct vtnet_softc *sc;
2755 struct vtnet_txq *txq;
2756 int i, npairs, error;
2757
2758 sc = if_getsoftc(ifp);
2759 npairs = sc->vtnet_act_vq_pairs;
2760
2761 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE)
2762 i = m->m_pkthdr.flowid % npairs;
2763 else
2764 i = curcpu % npairs;
2765
2766 txq = &sc->vtnet_txqs[i];
2767
2768 if (VTNET_TXQ_TRYLOCK(txq) != 0) {
2769 error = vtnet_txq_mq_start_locked(txq, m);
2770 VTNET_TXQ_UNLOCK(txq);
2771 } else {
2772 error = drbr_enqueue(ifp, txq->vtntx_br, m);
2773 taskqueue_enqueue(txq->vtntx_tq, &txq->vtntx_defrtask);
2774 }
2775
2776 return (error);
2777 }
2778
2779 static void
vtnet_txq_tq_deferred(void * xtxq,int pending __unused)2780 vtnet_txq_tq_deferred(void *xtxq, int pending __unused)
2781 {
2782 struct vtnet_softc *sc;
2783 struct vtnet_txq *txq;
2784
2785 txq = xtxq;
2786 sc = txq->vtntx_sc;
2787
2788 VTNET_TXQ_LOCK(txq);
2789 if (!drbr_empty(sc->vtnet_ifp, txq->vtntx_br))
2790 vtnet_txq_mq_start_locked(txq, NULL);
2791 VTNET_TXQ_UNLOCK(txq);
2792 }
2793
2794 #endif /* VTNET_LEGACY_TX */
2795
2796 static void
vtnet_txq_start(struct vtnet_txq * txq)2797 vtnet_txq_start(struct vtnet_txq *txq)
2798 {
2799 struct vtnet_softc *sc;
2800 if_t ifp;
2801
2802 sc = txq->vtntx_sc;
2803 ifp = sc->vtnet_ifp;
2804
2805 #ifdef VTNET_LEGACY_TX
2806 if (!if_sendq_empty(ifp))
2807 vtnet_start_locked(txq, ifp);
2808 #else
2809 if (!drbr_empty(ifp, txq->vtntx_br))
2810 vtnet_txq_mq_start_locked(txq, NULL);
2811 #endif
2812 }
2813
2814 static void
vtnet_txq_tq_intr(void * xtxq,int pending __unused)2815 vtnet_txq_tq_intr(void *xtxq, int pending __unused)
2816 {
2817 struct vtnet_softc *sc;
2818 struct vtnet_txq *txq;
2819 if_t ifp;
2820
2821 txq = xtxq;
2822 sc = txq->vtntx_sc;
2823 ifp = sc->vtnet_ifp;
2824
2825 VTNET_TXQ_LOCK(txq);
2826
2827 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2828 VTNET_TXQ_UNLOCK(txq);
2829 return;
2830 }
2831
2832 vtnet_txq_eof(txq);
2833 vtnet_txq_start(txq);
2834
2835 VTNET_TXQ_UNLOCK(txq);
2836 }
2837
2838 static int
vtnet_txq_eof(struct vtnet_txq * txq)2839 vtnet_txq_eof(struct vtnet_txq *txq)
2840 {
2841 struct virtqueue *vq;
2842 struct vtnet_tx_header *txhdr;
2843 struct mbuf *m;
2844 int deq;
2845
2846 vq = txq->vtntx_vq;
2847 deq = 0;
2848 VTNET_TXQ_LOCK_ASSERT(txq);
2849
2850 while ((txhdr = virtqueue_dequeue(vq, NULL)) != NULL) {
2851 m = txhdr->vth_mbuf;
2852 deq++;
2853
2854 txq->vtntx_stats.vtxs_opackets++;
2855 txq->vtntx_stats.vtxs_obytes += m->m_pkthdr.len;
2856 if (m->m_flags & M_MCAST)
2857 txq->vtntx_stats.vtxs_omcasts++;
2858
2859 m_freem(m);
2860 uma_zfree(vtnet_tx_header_zone, txhdr);
2861 }
2862
2863 if (virtqueue_empty(vq))
2864 txq->vtntx_watchdog = 0;
2865
2866 return (deq);
2867 }
2868
2869 static void
vtnet_tx_vq_intr(void * xtxq)2870 vtnet_tx_vq_intr(void *xtxq)
2871 {
2872 struct vtnet_softc *sc;
2873 struct vtnet_txq *txq;
2874 if_t ifp;
2875
2876 txq = xtxq;
2877 sc = txq->vtntx_sc;
2878 ifp = sc->vtnet_ifp;
2879
2880 if (__predict_false(txq->vtntx_id >= sc->vtnet_act_vq_pairs)) {
2881 /*
2882 * Ignore this interrupt. Either this is a spurious interrupt
2883 * or multiqueue without per-VQ MSIX so every queue needs to
2884 * be polled (a brain dead configuration we could try harder
2885 * to avoid).
2886 */
2887 vtnet_txq_disable_intr(txq);
2888 return;
2889 }
2890
2891 #ifdef DEV_NETMAP
2892 if (netmap_tx_irq(ifp, txq->vtntx_id) != NM_IRQ_PASS)
2893 return;
2894 #endif /* DEV_NETMAP */
2895
2896 VTNET_TXQ_LOCK(txq);
2897
2898 if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0) {
2899 VTNET_TXQ_UNLOCK(txq);
2900 return;
2901 }
2902
2903 vtnet_txq_eof(txq);
2904 vtnet_txq_start(txq);
2905
2906 VTNET_TXQ_UNLOCK(txq);
2907 }
2908
2909 static void
vtnet_tx_start_all(struct vtnet_softc * sc)2910 vtnet_tx_start_all(struct vtnet_softc *sc)
2911 {
2912 struct vtnet_txq *txq;
2913 int i;
2914
2915 VTNET_CORE_LOCK_ASSERT(sc);
2916
2917 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2918 txq = &sc->vtnet_txqs[i];
2919
2920 VTNET_TXQ_LOCK(txq);
2921 vtnet_txq_start(txq);
2922 VTNET_TXQ_UNLOCK(txq);
2923 }
2924 }
2925
2926 #ifndef VTNET_LEGACY_TX
2927 static void
vtnet_qflush(if_t ifp)2928 vtnet_qflush(if_t ifp)
2929 {
2930 struct vtnet_softc *sc;
2931 struct vtnet_txq *txq;
2932 struct mbuf *m;
2933 int i;
2934
2935 sc = if_getsoftc(ifp);
2936
2937 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
2938 txq = &sc->vtnet_txqs[i];
2939
2940 VTNET_TXQ_LOCK(txq);
2941 while ((m = buf_ring_dequeue_sc(txq->vtntx_br)) != NULL)
2942 m_freem(m);
2943 VTNET_TXQ_UNLOCK(txq);
2944 }
2945
2946 if_qflush(ifp);
2947 }
2948 #endif
2949
2950 static int
vtnet_watchdog(struct vtnet_txq * txq)2951 vtnet_watchdog(struct vtnet_txq *txq)
2952 {
2953 if_t ifp;
2954
2955 ifp = txq->vtntx_sc->vtnet_ifp;
2956
2957 VTNET_TXQ_LOCK(txq);
2958 if (txq->vtntx_watchdog == 1) {
2959 /*
2960 * Only drain completed frames if the watchdog is about to
2961 * expire. If any frames were drained, there may be enough
2962 * free descriptors now available to transmit queued frames.
2963 * In that case, the timer will immediately be decremented
2964 * below, but the timeout is generous enough that should not
2965 * be a problem.
2966 */
2967 if (vtnet_txq_eof(txq) != 0)
2968 vtnet_txq_start(txq);
2969 }
2970
2971 if (txq->vtntx_watchdog == 0 || --txq->vtntx_watchdog) {
2972 VTNET_TXQ_UNLOCK(txq);
2973 return (0);
2974 }
2975 VTNET_TXQ_UNLOCK(txq);
2976
2977 if_printf(ifp, "watchdog timeout on queue %d\n", txq->vtntx_id);
2978 return (1);
2979 }
2980
2981 static void
vtnet_accum_stats(struct vtnet_softc * sc,struct vtnet_rxq_stats * rxacc,struct vtnet_txq_stats * txacc)2982 vtnet_accum_stats(struct vtnet_softc *sc, struct vtnet_rxq_stats *rxacc,
2983 struct vtnet_txq_stats *txacc)
2984 {
2985
2986 bzero(rxacc, sizeof(struct vtnet_rxq_stats));
2987 bzero(txacc, sizeof(struct vtnet_txq_stats));
2988
2989 for (int i = 0; i < sc->vtnet_max_vq_pairs; i++) {
2990 struct vtnet_rxq_stats *rxst;
2991 struct vtnet_txq_stats *txst;
2992
2993 rxst = &sc->vtnet_rxqs[i].vtnrx_stats;
2994 rxacc->vrxs_ipackets += rxst->vrxs_ipackets;
2995 rxacc->vrxs_ibytes += rxst->vrxs_ibytes;
2996 rxacc->vrxs_iqdrops += rxst->vrxs_iqdrops;
2997 rxacc->vrxs_csum += rxst->vrxs_csum;
2998 rxacc->vrxs_csum_failed += rxst->vrxs_csum_failed;
2999 rxacc->vrxs_rescheduled += rxst->vrxs_rescheduled;
3000
3001 txst = &sc->vtnet_txqs[i].vtntx_stats;
3002 txacc->vtxs_opackets += txst->vtxs_opackets;
3003 txacc->vtxs_obytes += txst->vtxs_obytes;
3004 txacc->vtxs_csum += txst->vtxs_csum;
3005 txacc->vtxs_tso += txst->vtxs_tso;
3006 txacc->vtxs_rescheduled += txst->vtxs_rescheduled;
3007 }
3008 }
3009
3010 static uint64_t
vtnet_get_counter(if_t ifp,ift_counter cnt)3011 vtnet_get_counter(if_t ifp, ift_counter cnt)
3012 {
3013 struct vtnet_softc *sc;
3014 struct vtnet_rxq_stats rxaccum;
3015 struct vtnet_txq_stats txaccum;
3016
3017 sc = if_getsoftc(ifp);
3018 vtnet_accum_stats(sc, &rxaccum, &txaccum);
3019
3020 switch (cnt) {
3021 case IFCOUNTER_IPACKETS:
3022 return (rxaccum.vrxs_ipackets);
3023 case IFCOUNTER_IQDROPS:
3024 return (rxaccum.vrxs_iqdrops);
3025 case IFCOUNTER_IERRORS:
3026 return (rxaccum.vrxs_ierrors);
3027 case IFCOUNTER_OPACKETS:
3028 return (txaccum.vtxs_opackets);
3029 #ifndef VTNET_LEGACY_TX
3030 case IFCOUNTER_OBYTES:
3031 return (txaccum.vtxs_obytes);
3032 case IFCOUNTER_OMCASTS:
3033 return (txaccum.vtxs_omcasts);
3034 #endif
3035 default:
3036 return (if_get_counter_default(ifp, cnt));
3037 }
3038 }
3039
3040 static void
vtnet_tick(void * xsc)3041 vtnet_tick(void *xsc)
3042 {
3043 struct vtnet_softc *sc;
3044 if_t ifp;
3045 int i, timedout;
3046
3047 sc = xsc;
3048 ifp = sc->vtnet_ifp;
3049 timedout = 0;
3050
3051 VTNET_CORE_LOCK_ASSERT(sc);
3052
3053 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
3054 timedout |= vtnet_watchdog(&sc->vtnet_txqs[i]);
3055
3056 if (timedout != 0) {
3057 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3058 vtnet_init_locked(sc, 0);
3059 } else
3060 callout_schedule(&sc->vtnet_tick_ch, hz);
3061 }
3062
3063 static void
vtnet_start_taskqueues(struct vtnet_softc * sc)3064 vtnet_start_taskqueues(struct vtnet_softc *sc)
3065 {
3066 device_t dev;
3067 struct vtnet_rxq *rxq;
3068 struct vtnet_txq *txq;
3069 int i, error;
3070
3071 dev = sc->vtnet_dev;
3072
3073 /*
3074 * Errors here are very difficult to recover from - we cannot
3075 * easily fail because, if this is during boot, we will hang
3076 * when freeing any successfully started taskqueues because
3077 * the scheduler isn't up yet.
3078 *
3079 * Most drivers just ignore the return value - it only fails
3080 * with ENOMEM so an error is not likely.
3081 */
3082 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
3083 rxq = &sc->vtnet_rxqs[i];
3084 error = taskqueue_start_threads(&rxq->vtnrx_tq, 1, PI_NET,
3085 "%s rxq %d", device_get_nameunit(dev), rxq->vtnrx_id);
3086 if (error) {
3087 device_printf(dev, "failed to start rx taskq %d\n",
3088 rxq->vtnrx_id);
3089 }
3090
3091 txq = &sc->vtnet_txqs[i];
3092 error = taskqueue_start_threads(&txq->vtntx_tq, 1, PI_NET,
3093 "%s txq %d", device_get_nameunit(dev), txq->vtntx_id);
3094 if (error) {
3095 device_printf(dev, "failed to start tx taskq %d\n",
3096 txq->vtntx_id);
3097 }
3098 }
3099 }
3100
3101 static void
vtnet_free_taskqueues(struct vtnet_softc * sc)3102 vtnet_free_taskqueues(struct vtnet_softc *sc)
3103 {
3104 struct vtnet_rxq *rxq;
3105 struct vtnet_txq *txq;
3106 int i;
3107
3108 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3109 rxq = &sc->vtnet_rxqs[i];
3110 if (rxq->vtnrx_tq != NULL) {
3111 taskqueue_free(rxq->vtnrx_tq);
3112 rxq->vtnrx_tq = NULL;
3113 }
3114
3115 txq = &sc->vtnet_txqs[i];
3116 if (txq->vtntx_tq != NULL) {
3117 taskqueue_free(txq->vtntx_tq);
3118 txq->vtntx_tq = NULL;
3119 }
3120 }
3121 }
3122
3123 static void
vtnet_drain_taskqueues(struct vtnet_softc * sc)3124 vtnet_drain_taskqueues(struct vtnet_softc *sc)
3125 {
3126 struct vtnet_rxq *rxq;
3127 struct vtnet_txq *txq;
3128 int i;
3129
3130 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3131 rxq = &sc->vtnet_rxqs[i];
3132 if (rxq->vtnrx_tq != NULL)
3133 taskqueue_drain(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
3134
3135 txq = &sc->vtnet_txqs[i];
3136 if (txq->vtntx_tq != NULL) {
3137 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_intrtask);
3138 #ifndef VTNET_LEGACY_TX
3139 taskqueue_drain(txq->vtntx_tq, &txq->vtntx_defrtask);
3140 #endif
3141 }
3142 }
3143 }
3144
3145 static void
vtnet_drain_rxtx_queues(struct vtnet_softc * sc)3146 vtnet_drain_rxtx_queues(struct vtnet_softc *sc)
3147 {
3148 struct vtnet_rxq *rxq;
3149 struct vtnet_txq *txq;
3150 int i;
3151
3152 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3153 rxq = &sc->vtnet_rxqs[i];
3154 vtnet_rxq_free_mbufs(rxq);
3155
3156 txq = &sc->vtnet_txqs[i];
3157 vtnet_txq_free_mbufs(txq);
3158 }
3159 }
3160
3161 static void
vtnet_stop_rendezvous(struct vtnet_softc * sc)3162 vtnet_stop_rendezvous(struct vtnet_softc *sc)
3163 {
3164 struct vtnet_rxq *rxq;
3165 struct vtnet_txq *txq;
3166 int i;
3167
3168 VTNET_CORE_LOCK_ASSERT(sc);
3169
3170 /*
3171 * Lock and unlock the per-queue mutex so we known the stop
3172 * state is visible. Doing only the active queues should be
3173 * sufficient, but it does not cost much extra to do all the
3174 * queues.
3175 */
3176 for (i = 0; i < sc->vtnet_max_vq_pairs; i++) {
3177 rxq = &sc->vtnet_rxqs[i];
3178 VTNET_RXQ_LOCK(rxq);
3179 VTNET_RXQ_UNLOCK(rxq);
3180
3181 txq = &sc->vtnet_txqs[i];
3182 VTNET_TXQ_LOCK(txq);
3183 VTNET_TXQ_UNLOCK(txq);
3184 }
3185 }
3186
3187 static void
vtnet_stop(struct vtnet_softc * sc)3188 vtnet_stop(struct vtnet_softc *sc)
3189 {
3190 device_t dev;
3191 if_t ifp;
3192
3193 dev = sc->vtnet_dev;
3194 ifp = sc->vtnet_ifp;
3195
3196 VTNET_CORE_LOCK_ASSERT(sc);
3197
3198 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3199 sc->vtnet_link_active = 0;
3200 callout_stop(&sc->vtnet_tick_ch);
3201
3202 /* Only advisory. */
3203 vtnet_disable_interrupts(sc);
3204
3205 #ifdef DEV_NETMAP
3206 /* Stop any pending txsync/rxsync and disable them. */
3207 netmap_disable_all_rings(ifp);
3208 #endif /* DEV_NETMAP */
3209
3210 /*
3211 * Stop the host adapter. This resets it to the pre-initialized
3212 * state. It will not generate any interrupts until after it is
3213 * reinitialized.
3214 */
3215 virtio_stop(dev);
3216 vtnet_stop_rendezvous(sc);
3217
3218 vtnet_drain_rxtx_queues(sc);
3219 sc->vtnet_act_vq_pairs = 1;
3220 }
3221
3222 static int
vtnet_virtio_reinit(struct vtnet_softc * sc)3223 vtnet_virtio_reinit(struct vtnet_softc *sc)
3224 {
3225 device_t dev;
3226 if_t ifp;
3227 uint64_t features;
3228 int error;
3229
3230 dev = sc->vtnet_dev;
3231 ifp = sc->vtnet_ifp;
3232 features = sc->vtnet_negotiated_features;
3233
3234 /*
3235 * Re-negotiate with the host, removing any disabled receive
3236 * features. Transmit features are disabled only on our side
3237 * via if_capenable and if_hwassist.
3238 */
3239
3240 if ((if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) == 0)
3241 features &= ~(VIRTIO_NET_F_GUEST_CSUM | VTNET_LRO_FEATURES);
3242
3243 if ((if_getcapenable(ifp) & IFCAP_LRO) == 0)
3244 features &= ~VTNET_LRO_FEATURES;
3245
3246 if ((if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER) == 0)
3247 features &= ~VIRTIO_NET_F_CTRL_VLAN;
3248
3249 error = virtio_reinit(dev, features);
3250 if (error) {
3251 device_printf(dev, "virtio reinit error %d\n", error);
3252 return (error);
3253 }
3254
3255 sc->vtnet_features = features;
3256 virtio_reinit_complete(dev);
3257
3258 return (0);
3259 }
3260
3261 static void
vtnet_init_rx_filters(struct vtnet_softc * sc)3262 vtnet_init_rx_filters(struct vtnet_softc *sc)
3263 {
3264 if_t ifp;
3265
3266 ifp = sc->vtnet_ifp;
3267
3268 if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX) {
3269 vtnet_rx_filter(sc);
3270 vtnet_rx_filter_mac(sc);
3271 }
3272
3273 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER)
3274 vtnet_rx_filter_vlan(sc);
3275 }
3276
3277 static int
vtnet_init_rx_queues(struct vtnet_softc * sc)3278 vtnet_init_rx_queues(struct vtnet_softc *sc)
3279 {
3280 device_t dev;
3281 if_t ifp;
3282 struct vtnet_rxq *rxq;
3283 int i, clustersz, error;
3284
3285 dev = sc->vtnet_dev;
3286 ifp = sc->vtnet_ifp;
3287
3288 clustersz = vtnet_rx_cluster_size(sc, if_getmtu(ifp));
3289 sc->vtnet_rx_clustersz = clustersz;
3290
3291 if (sc->vtnet_flags & VTNET_FLAG_LRO_NOMRG) {
3292 sc->vtnet_rx_nmbufs = howmany(sizeof(struct vtnet_rx_header) +
3293 VTNET_MAX_RX_SIZE, clustersz);
3294 KASSERT(sc->vtnet_rx_nmbufs < sc->vtnet_rx_nsegs,
3295 ("%s: too many rx mbufs %d for %d segments", __func__,
3296 sc->vtnet_rx_nmbufs, sc->vtnet_rx_nsegs));
3297 } else
3298 sc->vtnet_rx_nmbufs = 1;
3299
3300 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3301 rxq = &sc->vtnet_rxqs[i];
3302
3303 /* Hold the lock to satisfy asserts. */
3304 VTNET_RXQ_LOCK(rxq);
3305 error = vtnet_rxq_populate(rxq);
3306 VTNET_RXQ_UNLOCK(rxq);
3307
3308 if (error) {
3309 device_printf(dev, "cannot populate Rx queue %d\n", i);
3310 return (error);
3311 }
3312 }
3313
3314 return (0);
3315 }
3316
3317 static int
vtnet_init_tx_queues(struct vtnet_softc * sc)3318 vtnet_init_tx_queues(struct vtnet_softc *sc)
3319 {
3320 struct vtnet_txq *txq;
3321 int i;
3322
3323 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
3324 txq = &sc->vtnet_txqs[i];
3325 txq->vtntx_watchdog = 0;
3326 txq->vtntx_intr_threshold = vtnet_txq_intr_threshold(txq);
3327 #ifdef DEV_NETMAP
3328 netmap_reset(NA(sc->vtnet_ifp), NR_TX, i, 0);
3329 #endif /* DEV_NETMAP */
3330 }
3331
3332 return (0);
3333 }
3334
3335 static int
vtnet_init_rxtx_queues(struct vtnet_softc * sc)3336 vtnet_init_rxtx_queues(struct vtnet_softc *sc)
3337 {
3338 int error;
3339
3340 error = vtnet_init_rx_queues(sc);
3341 if (error)
3342 return (error);
3343
3344 error = vtnet_init_tx_queues(sc);
3345 if (error)
3346 return (error);
3347
3348 return (0);
3349 }
3350
3351 static void
vtnet_set_active_vq_pairs(struct vtnet_softc * sc)3352 vtnet_set_active_vq_pairs(struct vtnet_softc *sc)
3353 {
3354 device_t dev;
3355 int npairs;
3356
3357 dev = sc->vtnet_dev;
3358
3359 if ((sc->vtnet_flags & VTNET_FLAG_MQ) == 0) {
3360 sc->vtnet_act_vq_pairs = 1;
3361 return;
3362 }
3363
3364 npairs = sc->vtnet_req_vq_pairs;
3365
3366 if (vtnet_ctrl_mq_cmd(sc, npairs) != 0) {
3367 device_printf(dev, "cannot set active queue pairs to %d, "
3368 "falling back to 1 queue pair\n", npairs);
3369 npairs = 1;
3370 }
3371
3372 sc->vtnet_act_vq_pairs = npairs;
3373 }
3374
3375 static void
vtnet_update_rx_offloads(struct vtnet_softc * sc)3376 vtnet_update_rx_offloads(struct vtnet_softc *sc)
3377 {
3378 if_t ifp;
3379 uint64_t features;
3380 int error;
3381
3382 ifp = sc->vtnet_ifp;
3383 features = sc->vtnet_features;
3384
3385 VTNET_CORE_LOCK_ASSERT(sc);
3386
3387 if (if_getcapabilities(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6)) {
3388 if (if_getcapenable(ifp) & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6))
3389 features |= VIRTIO_NET_F_GUEST_CSUM;
3390 else
3391 features &= ~VIRTIO_NET_F_GUEST_CSUM;
3392 }
3393
3394 if (if_getcapabilities(ifp) & IFCAP_LRO && !vtnet_software_lro(sc)) {
3395 if (if_getcapenable(ifp) & IFCAP_LRO)
3396 features |= VTNET_LRO_FEATURES;
3397 else
3398 features &= ~VTNET_LRO_FEATURES;
3399 }
3400
3401 error = vtnet_ctrl_guest_offloads(sc,
3402 features & (VIRTIO_NET_F_GUEST_CSUM | VIRTIO_NET_F_GUEST_TSO4 |
3403 VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN |
3404 VIRTIO_NET_F_GUEST_UFO));
3405 if (error) {
3406 device_printf(sc->vtnet_dev,
3407 "%s: cannot update Rx features\n", __func__);
3408 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING) {
3409 if_setdrvflagbits(ifp, 0, IFF_DRV_RUNNING);
3410 vtnet_init_locked(sc, 0);
3411 }
3412 } else
3413 sc->vtnet_features = features;
3414 }
3415
3416 static int
vtnet_reinit(struct vtnet_softc * sc)3417 vtnet_reinit(struct vtnet_softc *sc)
3418 {
3419 if_t ifp;
3420 int error;
3421
3422 ifp = sc->vtnet_ifp;
3423
3424 bcopy(if_getlladdr(ifp), sc->vtnet_hwaddr, ETHER_ADDR_LEN);
3425
3426 error = vtnet_virtio_reinit(sc);
3427 if (error)
3428 return (error);
3429
3430 vtnet_set_macaddr(sc);
3431 vtnet_set_active_vq_pairs(sc);
3432
3433 if (sc->vtnet_flags & VTNET_FLAG_CTRL_VQ)
3434 vtnet_init_rx_filters(sc);
3435
3436 if_sethwassist(ifp, 0);
3437 if (if_getcapenable(ifp) & IFCAP_TXCSUM)
3438 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD, 0);
3439 if (if_getcapenable(ifp) & IFCAP_TXCSUM_IPV6)
3440 if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0);
3441 if (if_getcapenable(ifp) & IFCAP_TSO4)
3442 if_sethwassistbits(ifp, CSUM_IP_TSO, 0);
3443 if (if_getcapenable(ifp) & IFCAP_TSO6)
3444 if_sethwassistbits(ifp, CSUM_IP6_TSO, 0);
3445
3446 error = vtnet_init_rxtx_queues(sc);
3447 if (error)
3448 return (error);
3449
3450 return (0);
3451 }
3452
3453 static void
vtnet_init_locked(struct vtnet_softc * sc,int init_mode)3454 vtnet_init_locked(struct vtnet_softc *sc, int init_mode)
3455 {
3456 if_t ifp;
3457
3458 ifp = sc->vtnet_ifp;
3459
3460 VTNET_CORE_LOCK_ASSERT(sc);
3461
3462 if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
3463 return;
3464
3465 vtnet_stop(sc);
3466
3467 #ifdef DEV_NETMAP
3468 /* Once stopped we can update the netmap flags, if necessary. */
3469 switch (init_mode) {
3470 case VTNET_INIT_NETMAP_ENTER:
3471 nm_set_native_flags(NA(ifp));
3472 break;
3473 case VTNET_INIT_NETMAP_EXIT:
3474 nm_clear_native_flags(NA(ifp));
3475 break;
3476 }
3477 #endif /* DEV_NETMAP */
3478
3479 if (vtnet_reinit(sc) != 0) {
3480 vtnet_stop(sc);
3481 return;
3482 }
3483
3484 if_setdrvflagbits(ifp, IFF_DRV_RUNNING, 0);
3485 vtnet_update_link_status(sc);
3486 vtnet_enable_interrupts(sc);
3487 callout_reset(&sc->vtnet_tick_ch, hz, vtnet_tick, sc);
3488
3489 #ifdef DEV_NETMAP
3490 /* Re-enable txsync/rxsync. */
3491 netmap_enable_all_rings(ifp);
3492 #endif /* DEV_NETMAP */
3493 }
3494
3495 static void
vtnet_init(void * xsc)3496 vtnet_init(void *xsc)
3497 {
3498 struct vtnet_softc *sc;
3499
3500 sc = xsc;
3501
3502 VTNET_CORE_LOCK(sc);
3503 vtnet_init_locked(sc, 0);
3504 VTNET_CORE_UNLOCK(sc);
3505 }
3506
3507 static void
vtnet_free_ctrl_vq(struct vtnet_softc * sc)3508 vtnet_free_ctrl_vq(struct vtnet_softc *sc)
3509 {
3510
3511 /*
3512 * The control virtqueue is only polled and therefore it should
3513 * already be empty.
3514 */
3515 KASSERT(virtqueue_empty(sc->vtnet_ctrl_vq),
3516 ("%s: ctrl vq %p not empty", __func__, sc->vtnet_ctrl_vq));
3517 }
3518
3519 static void
vtnet_exec_ctrl_cmd(struct vtnet_softc * sc,void * cookie,struct sglist * sg,int readable,int writable)3520 vtnet_exec_ctrl_cmd(struct vtnet_softc *sc, void *cookie,
3521 struct sglist *sg, int readable, int writable)
3522 {
3523 struct virtqueue *vq;
3524
3525 vq = sc->vtnet_ctrl_vq;
3526
3527 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_VQ);
3528 VTNET_CORE_LOCK_ASSERT(sc);
3529
3530 if (!virtqueue_empty(vq))
3531 return;
3532
3533 /*
3534 * Poll for the response, but the command is likely completed before
3535 * returning from the notify.
3536 */
3537 if (virtqueue_enqueue(vq, cookie, sg, readable, writable) == 0) {
3538 virtqueue_notify(vq);
3539 virtqueue_poll(vq, NULL);
3540 }
3541 }
3542
3543 static int
vtnet_ctrl_mac_cmd(struct vtnet_softc * sc,uint8_t * hwaddr)3544 vtnet_ctrl_mac_cmd(struct vtnet_softc *sc, uint8_t *hwaddr)
3545 {
3546 struct sglist_seg segs[3];
3547 struct sglist sg;
3548 struct {
3549 struct virtio_net_ctrl_hdr hdr __aligned(2);
3550 uint8_t pad1;
3551 uint8_t addr[ETHER_ADDR_LEN] __aligned(8);
3552 uint8_t pad2;
3553 uint8_t ack;
3554 } s;
3555 int error;
3556
3557 error = 0;
3558 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_MAC);
3559
3560 s.hdr.class = VIRTIO_NET_CTRL_MAC;
3561 s.hdr.cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET;
3562 bcopy(hwaddr, &s.addr[0], ETHER_ADDR_LEN);
3563 s.ack = VIRTIO_NET_ERR;
3564
3565 sglist_init(&sg, nitems(segs), segs);
3566 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3567 error |= sglist_append(&sg, &s.addr[0], ETHER_ADDR_LEN);
3568 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3569 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3570
3571 if (error == 0)
3572 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3573
3574 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3575 }
3576
3577 static int
vtnet_ctrl_guest_offloads(struct vtnet_softc * sc,uint64_t offloads)3578 vtnet_ctrl_guest_offloads(struct vtnet_softc *sc, uint64_t offloads)
3579 {
3580 struct sglist_seg segs[3];
3581 struct sglist sg;
3582 struct {
3583 struct virtio_net_ctrl_hdr hdr __aligned(2);
3584 uint8_t pad1;
3585 uint64_t offloads __aligned(8);
3586 uint8_t pad2;
3587 uint8_t ack;
3588 } s;
3589 int error;
3590
3591 error = 0;
3592 MPASS(sc->vtnet_features & VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
3593
3594 s.hdr.class = VIRTIO_NET_CTRL_GUEST_OFFLOADS;
3595 s.hdr.cmd = VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET;
3596 s.offloads = vtnet_gtoh64(sc, offloads);
3597 s.ack = VIRTIO_NET_ERR;
3598
3599 sglist_init(&sg, nitems(segs), segs);
3600 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3601 error |= sglist_append(&sg, &s.offloads, sizeof(uint64_t));
3602 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3603 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3604
3605 if (error == 0)
3606 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3607
3608 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3609 }
3610
3611 static int
vtnet_ctrl_mq_cmd(struct vtnet_softc * sc,uint16_t npairs)3612 vtnet_ctrl_mq_cmd(struct vtnet_softc *sc, uint16_t npairs)
3613 {
3614 struct sglist_seg segs[3];
3615 struct sglist sg;
3616 struct {
3617 struct virtio_net_ctrl_hdr hdr __aligned(2);
3618 uint8_t pad1;
3619 struct virtio_net_ctrl_mq mq __aligned(2);
3620 uint8_t pad2;
3621 uint8_t ack;
3622 } s;
3623 int error;
3624
3625 error = 0;
3626 MPASS(sc->vtnet_flags & VTNET_FLAG_MQ);
3627
3628 s.hdr.class = VIRTIO_NET_CTRL_MQ;
3629 s.hdr.cmd = VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET;
3630 s.mq.virtqueue_pairs = vtnet_gtoh16(sc, npairs);
3631 s.ack = VIRTIO_NET_ERR;
3632
3633 sglist_init(&sg, nitems(segs), segs);
3634 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3635 error |= sglist_append(&sg, &s.mq, sizeof(struct virtio_net_ctrl_mq));
3636 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3637 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3638
3639 if (error == 0)
3640 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3641
3642 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3643 }
3644
3645 static int
vtnet_ctrl_rx_cmd(struct vtnet_softc * sc,uint8_t cmd,bool on)3646 vtnet_ctrl_rx_cmd(struct vtnet_softc *sc, uint8_t cmd, bool on)
3647 {
3648 struct sglist_seg segs[3];
3649 struct sglist sg;
3650 struct {
3651 struct virtio_net_ctrl_hdr hdr __aligned(2);
3652 uint8_t pad1;
3653 uint8_t onoff;
3654 uint8_t pad2;
3655 uint8_t ack;
3656 } s;
3657 int error;
3658
3659 error = 0;
3660 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3661
3662 s.hdr.class = VIRTIO_NET_CTRL_RX;
3663 s.hdr.cmd = cmd;
3664 s.onoff = on;
3665 s.ack = VIRTIO_NET_ERR;
3666
3667 sglist_init(&sg, nitems(segs), segs);
3668 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3669 error |= sglist_append(&sg, &s.onoff, sizeof(uint8_t));
3670 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3671 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3672
3673 if (error == 0)
3674 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3675
3676 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3677 }
3678
3679 static int
vtnet_set_promisc(struct vtnet_softc * sc,bool on)3680 vtnet_set_promisc(struct vtnet_softc *sc, bool on)
3681 {
3682 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_PROMISC, on));
3683 }
3684
3685 static int
vtnet_set_allmulti(struct vtnet_softc * sc,bool on)3686 vtnet_set_allmulti(struct vtnet_softc *sc, bool on)
3687 {
3688 return (vtnet_ctrl_rx_cmd(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, on));
3689 }
3690
3691 static void
vtnet_rx_filter(struct vtnet_softc * sc)3692 vtnet_rx_filter(struct vtnet_softc *sc)
3693 {
3694 device_t dev;
3695 if_t ifp;
3696
3697 dev = sc->vtnet_dev;
3698 ifp = sc->vtnet_ifp;
3699
3700 VTNET_CORE_LOCK_ASSERT(sc);
3701
3702 if (vtnet_set_promisc(sc, if_getflags(ifp) & IFF_PROMISC) != 0) {
3703 device_printf(dev, "cannot %s promiscuous mode\n",
3704 if_getflags(ifp) & IFF_PROMISC ? "enable" : "disable");
3705 }
3706
3707 if (vtnet_set_allmulti(sc, if_getflags(ifp) & IFF_ALLMULTI) != 0) {
3708 device_printf(dev, "cannot %s all-multicast mode\n",
3709 if_getflags(ifp) & IFF_ALLMULTI ? "enable" : "disable");
3710 }
3711 }
3712
3713 static u_int
vtnet_copy_ifaddr(void * arg,struct sockaddr_dl * sdl,u_int ucnt)3714 vtnet_copy_ifaddr(void *arg, struct sockaddr_dl *sdl, u_int ucnt)
3715 {
3716 struct vtnet_softc *sc = arg;
3717
3718 if (memcmp(LLADDR(sdl), sc->vtnet_hwaddr, ETHER_ADDR_LEN) == 0)
3719 return (0);
3720
3721 if (ucnt < VTNET_MAX_MAC_ENTRIES)
3722 bcopy(LLADDR(sdl),
3723 &sc->vtnet_mac_filter->vmf_unicast.macs[ucnt],
3724 ETHER_ADDR_LEN);
3725
3726 return (1);
3727 }
3728
3729 static u_int
vtnet_copy_maddr(void * arg,struct sockaddr_dl * sdl,u_int mcnt)3730 vtnet_copy_maddr(void *arg, struct sockaddr_dl *sdl, u_int mcnt)
3731 {
3732 struct vtnet_mac_filter *filter = arg;
3733
3734 if (mcnt < VTNET_MAX_MAC_ENTRIES)
3735 bcopy(LLADDR(sdl), &filter->vmf_multicast.macs[mcnt],
3736 ETHER_ADDR_LEN);
3737
3738 return (1);
3739 }
3740
3741 static void
vtnet_rx_filter_mac(struct vtnet_softc * sc)3742 vtnet_rx_filter_mac(struct vtnet_softc *sc)
3743 {
3744 struct virtio_net_ctrl_hdr hdr __aligned(2);
3745 struct vtnet_mac_filter *filter;
3746 struct sglist_seg segs[4];
3747 struct sglist sg;
3748 if_t ifp;
3749 bool promisc, allmulti;
3750 u_int ucnt, mcnt;
3751 int error;
3752 uint8_t ack;
3753
3754 ifp = sc->vtnet_ifp;
3755 filter = sc->vtnet_mac_filter;
3756 error = 0;
3757
3758 MPASS(sc->vtnet_flags & VTNET_FLAG_CTRL_RX);
3759 VTNET_CORE_LOCK_ASSERT(sc);
3760
3761 /* Unicast MAC addresses: */
3762 ucnt = if_foreach_lladdr(ifp, vtnet_copy_ifaddr, sc);
3763 promisc = (ucnt > VTNET_MAX_MAC_ENTRIES);
3764
3765 if (promisc) {
3766 ucnt = 0;
3767 if_printf(ifp, "more than %d MAC addresses assigned, "
3768 "falling back to promiscuous mode\n",
3769 VTNET_MAX_MAC_ENTRIES);
3770 }
3771
3772 /* Multicast MAC addresses: */
3773 mcnt = if_foreach_llmaddr(ifp, vtnet_copy_maddr, filter);
3774 allmulti = (mcnt > VTNET_MAX_MAC_ENTRIES);
3775
3776 if (allmulti) {
3777 mcnt = 0;
3778 if_printf(ifp, "more than %d multicast MAC addresses "
3779 "assigned, falling back to all-multicast mode\n",
3780 VTNET_MAX_MAC_ENTRIES);
3781 }
3782
3783 if (promisc && allmulti)
3784 goto out;
3785
3786 filter->vmf_unicast.nentries = vtnet_gtoh32(sc, ucnt);
3787 filter->vmf_multicast.nentries = vtnet_gtoh32(sc, mcnt);
3788
3789 hdr.class = VIRTIO_NET_CTRL_MAC;
3790 hdr.cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
3791 ack = VIRTIO_NET_ERR;
3792
3793 sglist_init(&sg, nitems(segs), segs);
3794 error |= sglist_append(&sg, &hdr, sizeof(struct virtio_net_ctrl_hdr));
3795 error |= sglist_append(&sg, &filter->vmf_unicast,
3796 sizeof(uint32_t) + ucnt * ETHER_ADDR_LEN);
3797 error |= sglist_append(&sg, &filter->vmf_multicast,
3798 sizeof(uint32_t) + mcnt * ETHER_ADDR_LEN);
3799 error |= sglist_append(&sg, &ack, sizeof(uint8_t));
3800 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3801
3802 if (error == 0)
3803 vtnet_exec_ctrl_cmd(sc, &ack, &sg, sg.sg_nseg - 1, 1);
3804 if (ack != VIRTIO_NET_OK)
3805 if_printf(ifp, "error setting host MAC filter table\n");
3806
3807 out:
3808 if (promisc != 0 && vtnet_set_promisc(sc, true) != 0)
3809 if_printf(ifp, "cannot enable promiscuous mode\n");
3810 if (allmulti != 0 && vtnet_set_allmulti(sc, true) != 0)
3811 if_printf(ifp, "cannot enable all-multicast mode\n");
3812 }
3813
3814 static int
vtnet_exec_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3815 vtnet_exec_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3816 {
3817 struct sglist_seg segs[3];
3818 struct sglist sg;
3819 struct {
3820 struct virtio_net_ctrl_hdr hdr __aligned(2);
3821 uint8_t pad1;
3822 uint16_t tag __aligned(2);
3823 uint8_t pad2;
3824 uint8_t ack;
3825 } s;
3826 int error;
3827
3828 error = 0;
3829 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3830
3831 s.hdr.class = VIRTIO_NET_CTRL_VLAN;
3832 s.hdr.cmd = add ? VIRTIO_NET_CTRL_VLAN_ADD : VIRTIO_NET_CTRL_VLAN_DEL;
3833 s.tag = vtnet_gtoh16(sc, tag);
3834 s.ack = VIRTIO_NET_ERR;
3835
3836 sglist_init(&sg, nitems(segs), segs);
3837 error |= sglist_append(&sg, &s.hdr, sizeof(struct virtio_net_ctrl_hdr));
3838 error |= sglist_append(&sg, &s.tag, sizeof(uint16_t));
3839 error |= sglist_append(&sg, &s.ack, sizeof(uint8_t));
3840 MPASS(error == 0 && sg.sg_nseg == nitems(segs));
3841
3842 if (error == 0)
3843 vtnet_exec_ctrl_cmd(sc, &s.ack, &sg, sg.sg_nseg - 1, 1);
3844
3845 return (s.ack == VIRTIO_NET_OK ? 0 : EIO);
3846 }
3847
3848 static void
vtnet_rx_filter_vlan(struct vtnet_softc * sc)3849 vtnet_rx_filter_vlan(struct vtnet_softc *sc)
3850 {
3851 int i, bit;
3852 uint32_t w;
3853 uint16_t tag;
3854
3855 MPASS(sc->vtnet_flags & VTNET_FLAG_VLAN_FILTER);
3856 VTNET_CORE_LOCK_ASSERT(sc);
3857
3858 /* Enable the filter for each configured VLAN. */
3859 for (i = 0; i < VTNET_VLAN_FILTER_NWORDS; i++) {
3860 w = sc->vtnet_vlan_filter[i];
3861
3862 while ((bit = ffs(w) - 1) != -1) {
3863 w &= ~(1 << bit);
3864 tag = sizeof(w) * CHAR_BIT * i + bit;
3865
3866 if (vtnet_exec_vlan_filter(sc, 1, tag) != 0) {
3867 device_printf(sc->vtnet_dev,
3868 "cannot enable VLAN %d filter\n", tag);
3869 }
3870 }
3871 }
3872 }
3873
3874 static void
vtnet_update_vlan_filter(struct vtnet_softc * sc,int add,uint16_t tag)3875 vtnet_update_vlan_filter(struct vtnet_softc *sc, int add, uint16_t tag)
3876 {
3877 if_t ifp;
3878 int idx, bit;
3879
3880 ifp = sc->vtnet_ifp;
3881 idx = (tag >> 5) & 0x7F;
3882 bit = tag & 0x1F;
3883
3884 if (tag == 0 || tag > 4095)
3885 return;
3886
3887 VTNET_CORE_LOCK(sc);
3888
3889 if (add)
3890 sc->vtnet_vlan_filter[idx] |= (1 << bit);
3891 else
3892 sc->vtnet_vlan_filter[idx] &= ~(1 << bit);
3893
3894 if (if_getcapenable(ifp) & IFCAP_VLAN_HWFILTER &&
3895 if_getdrvflags(ifp) & IFF_DRV_RUNNING &&
3896 vtnet_exec_vlan_filter(sc, add, tag) != 0) {
3897 device_printf(sc->vtnet_dev,
3898 "cannot %s VLAN %d %s the host filter table\n",
3899 add ? "add" : "remove", tag, add ? "to" : "from");
3900 }
3901
3902 VTNET_CORE_UNLOCK(sc);
3903 }
3904
3905 static void
vtnet_register_vlan(void * arg,if_t ifp,uint16_t tag)3906 vtnet_register_vlan(void *arg, if_t ifp, uint16_t tag)
3907 {
3908
3909 if (if_getsoftc(ifp) != arg)
3910 return;
3911
3912 vtnet_update_vlan_filter(arg, 1, tag);
3913 }
3914
3915 static void
vtnet_unregister_vlan(void * arg,if_t ifp,uint16_t tag)3916 vtnet_unregister_vlan(void *arg, if_t ifp, uint16_t tag)
3917 {
3918
3919 if (if_getsoftc(ifp) != arg)
3920 return;
3921
3922 vtnet_update_vlan_filter(arg, 0, tag);
3923 }
3924
3925 static void
vtnet_update_speed_duplex(struct vtnet_softc * sc)3926 vtnet_update_speed_duplex(struct vtnet_softc *sc)
3927 {
3928 if_t ifp;
3929 uint32_t speed;
3930
3931 ifp = sc->vtnet_ifp;
3932
3933 if ((sc->vtnet_features & VIRTIO_NET_F_SPEED_DUPLEX) == 0)
3934 return;
3935
3936 /* BMV: Ignore duplex. */
3937 speed = virtio_read_dev_config_4(sc->vtnet_dev,
3938 offsetof(struct virtio_net_config, speed));
3939 if (speed != UINT32_MAX)
3940 if_setbaudrate(ifp, IF_Mbps(speed));
3941 }
3942
3943 static int
vtnet_is_link_up(struct vtnet_softc * sc)3944 vtnet_is_link_up(struct vtnet_softc *sc)
3945 {
3946 uint16_t status;
3947
3948 if ((sc->vtnet_features & VIRTIO_NET_F_STATUS) == 0)
3949 return (1);
3950
3951 status = virtio_read_dev_config_2(sc->vtnet_dev,
3952 offsetof(struct virtio_net_config, status));
3953
3954 return ((status & VIRTIO_NET_S_LINK_UP) != 0);
3955 }
3956
3957 static void
vtnet_update_link_status(struct vtnet_softc * sc)3958 vtnet_update_link_status(struct vtnet_softc *sc)
3959 {
3960 if_t ifp;
3961 int link;
3962
3963 ifp = sc->vtnet_ifp;
3964 VTNET_CORE_LOCK_ASSERT(sc);
3965 link = vtnet_is_link_up(sc);
3966
3967 /* Notify if the link status has changed. */
3968 if (link != 0 && sc->vtnet_link_active == 0) {
3969 vtnet_update_speed_duplex(sc);
3970 sc->vtnet_link_active = 1;
3971 if_link_state_change(ifp, LINK_STATE_UP);
3972 } else if (link == 0 && sc->vtnet_link_active != 0) {
3973 sc->vtnet_link_active = 0;
3974 if_link_state_change(ifp, LINK_STATE_DOWN);
3975 }
3976 }
3977
3978 static int
vtnet_ifmedia_upd(if_t ifp __unused)3979 vtnet_ifmedia_upd(if_t ifp __unused)
3980 {
3981 return (EOPNOTSUPP);
3982 }
3983
3984 static void
vtnet_ifmedia_sts(if_t ifp,struct ifmediareq * ifmr)3985 vtnet_ifmedia_sts(if_t ifp, struct ifmediareq *ifmr)
3986 {
3987 struct vtnet_softc *sc;
3988
3989 sc = if_getsoftc(ifp);
3990
3991 ifmr->ifm_status = IFM_AVALID;
3992 ifmr->ifm_active = IFM_ETHER;
3993
3994 VTNET_CORE_LOCK(sc);
3995 if (vtnet_is_link_up(sc) != 0) {
3996 ifmr->ifm_status |= IFM_ACTIVE;
3997 ifmr->ifm_active |= IFM_10G_T | IFM_FDX;
3998 } else
3999 ifmr->ifm_active |= IFM_NONE;
4000 VTNET_CORE_UNLOCK(sc);
4001 }
4002
4003 static void
vtnet_get_macaddr(struct vtnet_softc * sc)4004 vtnet_get_macaddr(struct vtnet_softc *sc)
4005 {
4006
4007 if (sc->vtnet_flags & VTNET_FLAG_MAC) {
4008 virtio_read_device_config_array(sc->vtnet_dev,
4009 offsetof(struct virtio_net_config, mac),
4010 &sc->vtnet_hwaddr[0], sizeof(uint8_t), ETHER_ADDR_LEN);
4011 } else {
4012 /* Generate a random locally administered unicast address. */
4013 sc->vtnet_hwaddr[0] = 0xB2;
4014 arc4rand(&sc->vtnet_hwaddr[1], ETHER_ADDR_LEN - 1, 0);
4015 }
4016 }
4017
4018 static void
vtnet_set_macaddr(struct vtnet_softc * sc)4019 vtnet_set_macaddr(struct vtnet_softc *sc)
4020 {
4021 device_t dev;
4022 int error;
4023
4024 dev = sc->vtnet_dev;
4025
4026 if (sc->vtnet_flags & VTNET_FLAG_CTRL_MAC) {
4027 error = vtnet_ctrl_mac_cmd(sc, sc->vtnet_hwaddr);
4028 if (error)
4029 device_printf(dev, "unable to set MAC address\n");
4030 return;
4031 }
4032
4033 /* MAC in config is read-only in modern VirtIO. */
4034 if (!vtnet_modern(sc) && sc->vtnet_flags & VTNET_FLAG_MAC) {
4035 for (int i = 0; i < ETHER_ADDR_LEN; i++) {
4036 virtio_write_dev_config_1(dev,
4037 offsetof(struct virtio_net_config, mac) + i,
4038 sc->vtnet_hwaddr[i]);
4039 }
4040 }
4041 }
4042
4043 static void
vtnet_attached_set_macaddr(struct vtnet_softc * sc)4044 vtnet_attached_set_macaddr(struct vtnet_softc *sc)
4045 {
4046
4047 /* Assign MAC address if it was generated. */
4048 if ((sc->vtnet_flags & VTNET_FLAG_MAC) == 0)
4049 vtnet_set_macaddr(sc);
4050 }
4051
4052 static void
vtnet_vlan_tag_remove(struct mbuf * m)4053 vtnet_vlan_tag_remove(struct mbuf *m)
4054 {
4055 struct ether_vlan_header *evh;
4056
4057 evh = mtod(m, struct ether_vlan_header *);
4058 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag);
4059 m->m_flags |= M_VLANTAG;
4060
4061 /* Strip the 802.1Q header. */
4062 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN,
4063 ETHER_HDR_LEN - ETHER_TYPE_LEN);
4064 m_adj(m, ETHER_VLAN_ENCAP_LEN);
4065 }
4066
4067 static void
vtnet_set_rx_process_limit(struct vtnet_softc * sc)4068 vtnet_set_rx_process_limit(struct vtnet_softc *sc)
4069 {
4070 int limit;
4071
4072 limit = vtnet_tunable_int(sc, "rx_process_limit",
4073 vtnet_rx_process_limit);
4074 if (limit < 0)
4075 limit = INT_MAX;
4076 sc->vtnet_rx_process_limit = limit;
4077 }
4078
4079 static void
vtnet_setup_rxq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_rxq * rxq)4080 vtnet_setup_rxq_sysctl(struct sysctl_ctx_list *ctx,
4081 struct sysctl_oid_list *child, struct vtnet_rxq *rxq)
4082 {
4083 struct sysctl_oid *node;
4084 struct sysctl_oid_list *list;
4085 struct vtnet_rxq_stats *stats;
4086 char namebuf[16];
4087
4088 snprintf(namebuf, sizeof(namebuf), "rxq%d", rxq->vtnrx_id);
4089 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4090 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Receive Queue");
4091 list = SYSCTL_CHILDREN(node);
4092
4093 stats = &rxq->vtnrx_stats;
4094
4095 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ipackets", CTLFLAG_RD,
4096 &stats->vrxs_ipackets, "Receive packets");
4097 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ibytes", CTLFLAG_RD,
4098 &stats->vrxs_ibytes, "Receive bytes");
4099 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "iqdrops", CTLFLAG_RD,
4100 &stats->vrxs_iqdrops, "Receive drops");
4101 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "ierrors", CTLFLAG_RD,
4102 &stats->vrxs_ierrors, "Receive errors");
4103 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD,
4104 &stats->vrxs_csum, "Receive checksum offloaded");
4105 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum_failed", CTLFLAG_RD,
4106 &stats->vrxs_csum_failed, "Receive checksum offload failed");
4107 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "host_lro", CTLFLAG_RD,
4108 &stats->vrxs_host_lro, "Receive host segmentation offloaded");
4109 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD,
4110 &stats->vrxs_rescheduled,
4111 "Receive interrupt handler rescheduled");
4112 }
4113
4114 static void
vtnet_setup_txq_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_txq * txq)4115 vtnet_setup_txq_sysctl(struct sysctl_ctx_list *ctx,
4116 struct sysctl_oid_list *child, struct vtnet_txq *txq)
4117 {
4118 struct sysctl_oid *node;
4119 struct sysctl_oid_list *list;
4120 struct vtnet_txq_stats *stats;
4121 char namebuf[16];
4122
4123 snprintf(namebuf, sizeof(namebuf), "txq%d", txq->vtntx_id);
4124 node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
4125 CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Transmit Queue");
4126 list = SYSCTL_CHILDREN(node);
4127
4128 stats = &txq->vtntx_stats;
4129
4130 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "opackets", CTLFLAG_RD,
4131 &stats->vtxs_opackets, "Transmit packets");
4132 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "obytes", CTLFLAG_RD,
4133 &stats->vtxs_obytes, "Transmit bytes");
4134 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "omcasts", CTLFLAG_RD,
4135 &stats->vtxs_omcasts, "Transmit multicasts");
4136 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "csum", CTLFLAG_RD,
4137 &stats->vtxs_csum, "Transmit checksum offloaded");
4138 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "tso", CTLFLAG_RD,
4139 &stats->vtxs_tso, "Transmit TCP segmentation offloaded");
4140 SYSCTL_ADD_UQUAD(ctx, list, OID_AUTO, "rescheduled", CTLFLAG_RD,
4141 &stats->vtxs_rescheduled,
4142 "Transmit interrupt handler rescheduled");
4143 }
4144
4145 static void
vtnet_setup_queue_sysctl(struct vtnet_softc * sc)4146 vtnet_setup_queue_sysctl(struct vtnet_softc *sc)
4147 {
4148 device_t dev;
4149 struct sysctl_ctx_list *ctx;
4150 struct sysctl_oid *tree;
4151 struct sysctl_oid_list *child;
4152 int i;
4153
4154 dev = sc->vtnet_dev;
4155 ctx = device_get_sysctl_ctx(dev);
4156 tree = device_get_sysctl_tree(dev);
4157 child = SYSCTL_CHILDREN(tree);
4158
4159 for (i = 0; i < sc->vtnet_req_vq_pairs; i++) {
4160 vtnet_setup_rxq_sysctl(ctx, child, &sc->vtnet_rxqs[i]);
4161 vtnet_setup_txq_sysctl(ctx, child, &sc->vtnet_txqs[i]);
4162 }
4163 }
4164
4165 static void
vtnet_setup_stat_sysctl(struct sysctl_ctx_list * ctx,struct sysctl_oid_list * child,struct vtnet_softc * sc)4166 vtnet_setup_stat_sysctl(struct sysctl_ctx_list *ctx,
4167 struct sysctl_oid_list *child, struct vtnet_softc *sc)
4168 {
4169 struct vtnet_statistics *stats;
4170 struct vtnet_rxq_stats rxaccum;
4171 struct vtnet_txq_stats txaccum;
4172
4173 vtnet_accum_stats(sc, &rxaccum, &txaccum);
4174
4175 stats = &sc->vtnet_stats;
4176 stats->rx_csum_offloaded = rxaccum.vrxs_csum;
4177 stats->rx_csum_failed = rxaccum.vrxs_csum_failed;
4178 stats->rx_task_rescheduled = rxaccum.vrxs_rescheduled;
4179 stats->tx_csum_offloaded = txaccum.vtxs_csum;
4180 stats->tx_tso_offloaded = txaccum.vtxs_tso;
4181 stats->tx_task_rescheduled = txaccum.vtxs_rescheduled;
4182
4183 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "mbuf_alloc_failed",
4184 CTLFLAG_RD, &stats->mbuf_alloc_failed,
4185 "Mbuf cluster allocation failures");
4186
4187 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_frame_too_large",
4188 CTLFLAG_RD, &stats->rx_frame_too_large,
4189 "Received frame larger than the mbuf chain");
4190 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_enq_replacement_failed",
4191 CTLFLAG_RD, &stats->rx_enq_replacement_failed,
4192 "Enqueuing the replacement receive mbuf failed");
4193 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_mergeable_failed",
4194 CTLFLAG_RD, &stats->rx_mergeable_failed,
4195 "Mergeable buffers receive failures");
4196 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ethtype",
4197 CTLFLAG_RD, &stats->rx_csum_bad_ethtype,
4198 "Received checksum offloaded buffer with unsupported "
4199 "Ethernet type");
4200 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_ipproto",
4201 CTLFLAG_RD, &stats->rx_csum_bad_ipproto,
4202 "Received checksum offloaded buffer with incorrect IP protocol");
4203 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_offset",
4204 CTLFLAG_RD, &stats->rx_csum_bad_offset,
4205 "Received checksum offloaded buffer with incorrect offset");
4206 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_bad_proto",
4207 CTLFLAG_RD, &stats->rx_csum_bad_proto,
4208 "Received checksum offloaded buffer with incorrect protocol");
4209 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_failed",
4210 CTLFLAG_RD, &stats->rx_csum_failed,
4211 "Received buffer checksum offload failed");
4212 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_csum_offloaded",
4213 CTLFLAG_RD, &stats->rx_csum_offloaded,
4214 "Received buffer checksum offload succeeded");
4215 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "rx_task_rescheduled",
4216 CTLFLAG_RD, &stats->rx_task_rescheduled,
4217 "Times the receive interrupt task rescheduled itself");
4218
4219 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_unknown_ethtype",
4220 CTLFLAG_RD, &stats->tx_csum_unknown_ethtype,
4221 "Aborted transmit of checksum offloaded buffer with unknown "
4222 "Ethernet type");
4223 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_proto_mismatch",
4224 CTLFLAG_RD, &stats->tx_csum_proto_mismatch,
4225 "Aborted transmit of checksum offloaded buffer because mismatched "
4226 "protocols");
4227 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_not_tcp",
4228 CTLFLAG_RD, &stats->tx_tso_not_tcp,
4229 "Aborted transmit of TSO buffer with non TCP protocol");
4230 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_without_csum",
4231 CTLFLAG_RD, &stats->tx_tso_without_csum,
4232 "Aborted transmit of TSO buffer without TCP checksum offload");
4233 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defragged",
4234 CTLFLAG_RD, &stats->tx_defragged,
4235 "Transmit mbufs defragged");
4236 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_defrag_failed",
4237 CTLFLAG_RD, &stats->tx_defrag_failed,
4238 "Aborted transmit of buffer because defrag failed");
4239 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_csum_offloaded",
4240 CTLFLAG_RD, &stats->tx_csum_offloaded,
4241 "Offloaded checksum of transmitted buffer");
4242 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_tso_offloaded",
4243 CTLFLAG_RD, &stats->tx_tso_offloaded,
4244 "Segmentation offload of transmitted buffer");
4245 SYSCTL_ADD_UQUAD(ctx, child, OID_AUTO, "tx_task_rescheduled",
4246 CTLFLAG_RD, &stats->tx_task_rescheduled,
4247 "Times the transmit interrupt task rescheduled itself");
4248 }
4249
4250 static void
vtnet_setup_sysctl(struct vtnet_softc * sc)4251 vtnet_setup_sysctl(struct vtnet_softc *sc)
4252 {
4253 device_t dev;
4254 struct sysctl_ctx_list *ctx;
4255 struct sysctl_oid *tree;
4256 struct sysctl_oid_list *child;
4257
4258 dev = sc->vtnet_dev;
4259 ctx = device_get_sysctl_ctx(dev);
4260 tree = device_get_sysctl_tree(dev);
4261 child = SYSCTL_CHILDREN(tree);
4262
4263 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "max_vq_pairs",
4264 CTLFLAG_RD, &sc->vtnet_max_vq_pairs, 0,
4265 "Number of maximum supported virtqueue pairs");
4266 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "req_vq_pairs",
4267 CTLFLAG_RD, &sc->vtnet_req_vq_pairs, 0,
4268 "Number of requested virtqueue pairs");
4269 SYSCTL_ADD_INT(ctx, child, OID_AUTO, "act_vq_pairs",
4270 CTLFLAG_RD, &sc->vtnet_act_vq_pairs, 0,
4271 "Number of active virtqueue pairs");
4272
4273 vtnet_setup_stat_sysctl(ctx, child, sc);
4274 }
4275
4276 static void
vtnet_load_tunables(struct vtnet_softc * sc)4277 vtnet_load_tunables(struct vtnet_softc *sc)
4278 {
4279
4280 sc->vtnet_lro_entry_count = vtnet_tunable_int(sc,
4281 "lro_entry_count", vtnet_lro_entry_count);
4282 if (sc->vtnet_lro_entry_count < TCP_LRO_ENTRIES)
4283 sc->vtnet_lro_entry_count = TCP_LRO_ENTRIES;
4284
4285 sc->vtnet_lro_mbufq_depth = vtnet_tunable_int(sc,
4286 "lro_mbufq_depth", vtnet_lro_mbufq_depth);
4287 }
4288
4289 static int
vtnet_rxq_enable_intr(struct vtnet_rxq * rxq)4290 vtnet_rxq_enable_intr(struct vtnet_rxq *rxq)
4291 {
4292
4293 return (virtqueue_enable_intr(rxq->vtnrx_vq));
4294 }
4295
4296 static void
vtnet_rxq_disable_intr(struct vtnet_rxq * rxq)4297 vtnet_rxq_disable_intr(struct vtnet_rxq *rxq)
4298 {
4299
4300 virtqueue_disable_intr(rxq->vtnrx_vq);
4301 }
4302
4303 static int
vtnet_txq_enable_intr(struct vtnet_txq * txq)4304 vtnet_txq_enable_intr(struct vtnet_txq *txq)
4305 {
4306 struct virtqueue *vq;
4307
4308 vq = txq->vtntx_vq;
4309
4310 if (vtnet_txq_below_threshold(txq) != 0)
4311 return (virtqueue_postpone_intr(vq, VQ_POSTPONE_LONG));
4312
4313 /*
4314 * The free count is above our threshold. Keep the Tx interrupt
4315 * disabled until the queue is fuller.
4316 */
4317 return (0);
4318 }
4319
4320 static void
vtnet_txq_disable_intr(struct vtnet_txq * txq)4321 vtnet_txq_disable_intr(struct vtnet_txq *txq)
4322 {
4323
4324 virtqueue_disable_intr(txq->vtntx_vq);
4325 }
4326
4327 static void
vtnet_enable_rx_interrupts(struct vtnet_softc * sc)4328 vtnet_enable_rx_interrupts(struct vtnet_softc *sc)
4329 {
4330 struct vtnet_rxq *rxq;
4331 int i;
4332
4333 for (i = 0; i < sc->vtnet_act_vq_pairs; i++) {
4334 rxq = &sc->vtnet_rxqs[i];
4335 if (vtnet_rxq_enable_intr(rxq) != 0)
4336 taskqueue_enqueue(rxq->vtnrx_tq, &rxq->vtnrx_intrtask);
4337 }
4338 }
4339
4340 static void
vtnet_enable_tx_interrupts(struct vtnet_softc * sc)4341 vtnet_enable_tx_interrupts(struct vtnet_softc *sc)
4342 {
4343 int i;
4344
4345 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4346 vtnet_txq_enable_intr(&sc->vtnet_txqs[i]);
4347 }
4348
4349 static void
vtnet_enable_interrupts(struct vtnet_softc * sc)4350 vtnet_enable_interrupts(struct vtnet_softc *sc)
4351 {
4352
4353 vtnet_enable_rx_interrupts(sc);
4354 vtnet_enable_tx_interrupts(sc);
4355 }
4356
4357 static void
vtnet_disable_rx_interrupts(struct vtnet_softc * sc)4358 vtnet_disable_rx_interrupts(struct vtnet_softc *sc)
4359 {
4360 int i;
4361
4362 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4363 vtnet_rxq_disable_intr(&sc->vtnet_rxqs[i]);
4364 }
4365
4366 static void
vtnet_disable_tx_interrupts(struct vtnet_softc * sc)4367 vtnet_disable_tx_interrupts(struct vtnet_softc *sc)
4368 {
4369 int i;
4370
4371 for (i = 0; i < sc->vtnet_max_vq_pairs; i++)
4372 vtnet_txq_disable_intr(&sc->vtnet_txqs[i]);
4373 }
4374
4375 static void
vtnet_disable_interrupts(struct vtnet_softc * sc)4376 vtnet_disable_interrupts(struct vtnet_softc *sc)
4377 {
4378
4379 vtnet_disable_rx_interrupts(sc);
4380 vtnet_disable_tx_interrupts(sc);
4381 }
4382
4383 static int
vtnet_tunable_int(struct vtnet_softc * sc,const char * knob,int def)4384 vtnet_tunable_int(struct vtnet_softc *sc, const char *knob, int def)
4385 {
4386 char path[64];
4387
4388 snprintf(path, sizeof(path),
4389 "hw.vtnet.%d.%s", device_get_unit(sc->vtnet_dev), knob);
4390 TUNABLE_INT_FETCH(path, &def);
4391
4392 return (def);
4393 }
4394
4395 #ifdef DEBUGNET
4396 static void
vtnet_debugnet_init(if_t ifp,int * nrxr,int * ncl,int * clsize)4397 vtnet_debugnet_init(if_t ifp, int *nrxr, int *ncl, int *clsize)
4398 {
4399 struct vtnet_softc *sc;
4400
4401 sc = if_getsoftc(ifp);
4402
4403 VTNET_CORE_LOCK(sc);
4404 *nrxr = sc->vtnet_req_vq_pairs;
4405 *ncl = DEBUGNET_MAX_IN_FLIGHT;
4406 *clsize = sc->vtnet_rx_clustersz;
4407 VTNET_CORE_UNLOCK(sc);
4408 }
4409
4410 static void
vtnet_debugnet_event(if_t ifp __unused,enum debugnet_ev event)4411 vtnet_debugnet_event(if_t ifp __unused, enum debugnet_ev event)
4412 {
4413 struct vtnet_softc *sc;
4414 static bool sw_lro_enabled = false;
4415
4416 /*
4417 * Disable software LRO, since it would require entering the network
4418 * epoch when calling vtnet_txq_eof() in vtnet_debugnet_poll().
4419 */
4420 sc = if_getsoftc(ifp);
4421 switch (event) {
4422 case DEBUGNET_START:
4423 sw_lro_enabled = (sc->vtnet_flags & VTNET_FLAG_SW_LRO) != 0;
4424 if (sw_lro_enabled)
4425 sc->vtnet_flags &= ~VTNET_FLAG_SW_LRO;
4426 break;
4427 case DEBUGNET_END:
4428 if (sw_lro_enabled)
4429 sc->vtnet_flags |= VTNET_FLAG_SW_LRO;
4430 break;
4431 }
4432 }
4433
4434 static int
vtnet_debugnet_transmit(if_t ifp,struct mbuf * m)4435 vtnet_debugnet_transmit(if_t ifp, struct mbuf *m)
4436 {
4437 struct vtnet_softc *sc;
4438 struct vtnet_txq *txq;
4439 int error;
4440
4441 sc = if_getsoftc(ifp);
4442 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4443 IFF_DRV_RUNNING)
4444 return (EBUSY);
4445
4446 txq = &sc->vtnet_txqs[0];
4447 error = vtnet_txq_encap(txq, &m, M_NOWAIT | M_USE_RESERVE);
4448 if (error == 0)
4449 (void)vtnet_txq_notify(txq);
4450 return (error);
4451 }
4452
4453 static int
vtnet_debugnet_poll(if_t ifp,int count)4454 vtnet_debugnet_poll(if_t ifp, int count)
4455 {
4456 struct vtnet_softc *sc;
4457 int i;
4458
4459 sc = if_getsoftc(ifp);
4460 if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
4461 IFF_DRV_RUNNING)
4462 return (EBUSY);
4463
4464 (void)vtnet_txq_eof(&sc->vtnet_txqs[0]);
4465 for (i = 0; i < sc->vtnet_act_vq_pairs; i++)
4466 (void)vtnet_rxq_eof(&sc->vtnet_rxqs[i]);
4467 return (0);
4468 }
4469 #endif /* DEBUGNET */
4470