1 /* $NetBSD: if_vioif.c,v 1.112 2024/06/29 12:11:12 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * Copyright (c) 2010 Minoura Makoto. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following 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 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: if_vioif.c,v 1.112 2024/06/29 12:11:12 riastradh Exp $"); 31 32 #ifdef _KERNEL_OPT 33 #include "opt_net_mpsafe.h" 34 #endif 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/atomic.h> 40 #include <sys/bus.h> 41 #include <sys/condvar.h> 42 #include <sys/device.h> 43 #include <sys/evcnt.h> 44 #include <sys/intr.h> 45 #include <sys/kmem.h> 46 #include <sys/mbuf.h> 47 #include <sys/mutex.h> 48 #include <sys/sockio.h> 49 #include <sys/syslog.h> 50 #include <sys/cpu.h> 51 #include <sys/module.h> 52 #include <sys/pcq.h> 53 #include <sys/workqueue.h> 54 #include <sys/xcall.h> 55 56 #include <dev/pci/virtioreg.h> 57 #include <dev/pci/virtiovar.h> 58 59 #include <net/if.h> 60 #include <net/if_dl.h> 61 #include <net/if_media.h> 62 #include <net/if_ether.h> 63 64 #include <net/bpf.h> 65 66 #include "ioconf.h" 67 68 #ifdef NET_MPSAFE 69 #define VIOIF_MPSAFE 1 70 #define VIOIF_MULTIQ 1 71 #endif 72 73 /* 74 * if_vioifreg.h: 75 */ 76 /* Configuration registers */ 77 #define VIRTIO_NET_CONFIG_MAC 0 /* 8bit x 6byte */ 78 #define VIRTIO_NET_CONFIG_STATUS 6 /* 16bit */ 79 #define VIRTIO_NET_CONFIG_MAX_VQ_PAIRS 8 /* 16bit */ 80 #define VIRTIO_NET_CONFIG_MTU 10 /* 16bit */ 81 82 /* Feature bits */ 83 #define VIRTIO_NET_F_CSUM __BIT(0) 84 #define VIRTIO_NET_F_GUEST_CSUM __BIT(1) 85 #define VIRTIO_NET_F_MAC __BIT(5) 86 #define VIRTIO_NET_F_GSO __BIT(6) 87 #define VIRTIO_NET_F_GUEST_TSO4 __BIT(7) 88 #define VIRTIO_NET_F_GUEST_TSO6 __BIT(8) 89 #define VIRTIO_NET_F_GUEST_ECN __BIT(9) 90 #define VIRTIO_NET_F_GUEST_UFO __BIT(10) 91 #define VIRTIO_NET_F_HOST_TSO4 __BIT(11) 92 #define VIRTIO_NET_F_HOST_TSO6 __BIT(12) 93 #define VIRTIO_NET_F_HOST_ECN __BIT(13) 94 #define VIRTIO_NET_F_HOST_UFO __BIT(14) 95 #define VIRTIO_NET_F_MRG_RXBUF __BIT(15) 96 #define VIRTIO_NET_F_STATUS __BIT(16) 97 #define VIRTIO_NET_F_CTRL_VQ __BIT(17) 98 #define VIRTIO_NET_F_CTRL_RX __BIT(18) 99 #define VIRTIO_NET_F_CTRL_VLAN __BIT(19) 100 #define VIRTIO_NET_F_CTRL_RX_EXTRA __BIT(20) 101 #define VIRTIO_NET_F_GUEST_ANNOUNCE __BIT(21) 102 #define VIRTIO_NET_F_MQ __BIT(22) 103 #define VIRTIO_NET_F_CTRL_MAC_ADDR __BIT(23) 104 105 #define VIRTIO_NET_FLAG_BITS \ 106 VIRTIO_COMMON_FLAG_BITS \ 107 "b\x17" "CTRL_MAC\0" \ 108 "b\x16" "MQ\0" \ 109 "b\x15" "GUEST_ANNOUNCE\0" \ 110 "b\x14" "CTRL_RX_EXTRA\0" \ 111 "b\x13" "CTRL_VLAN\0" \ 112 "b\x12" "CTRL_RX\0" \ 113 "b\x11" "CTRL_VQ\0" \ 114 "b\x10" "STATUS\0" \ 115 "b\x0f" "MRG_RXBUF\0" \ 116 "b\x0e" "HOST_UFO\0" \ 117 "b\x0d" "HOST_ECN\0" \ 118 "b\x0c" "HOST_TSO6\0" \ 119 "b\x0b" "HOST_TSO4\0" \ 120 "b\x0a" "GUEST_UFO\0" \ 121 "b\x09" "GUEST_ECN\0" \ 122 "b\x08" "GUEST_TSO6\0" \ 123 "b\x07" "GUEST_TSO4\0" \ 124 "b\x06" "GSO\0" \ 125 "b\x05" "MAC\0" \ 126 "b\x01" "GUEST_CSUM\0" \ 127 "b\x00" "CSUM\0" 128 129 /* Status */ 130 #define VIRTIO_NET_S_LINK_UP 1 131 132 /* Packet header structure */ 133 struct virtio_net_hdr { 134 uint8_t flags; 135 uint8_t gso_type; 136 uint16_t hdr_len; 137 uint16_t gso_size; 138 uint16_t csum_start; 139 uint16_t csum_offset; 140 141 uint16_t num_buffers; /* VIRTIO_NET_F_MRG_RXBUF enabled or v1 */ 142 } __packed; 143 144 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* flags */ 145 #define VIRTIO_NET_HDR_GSO_NONE 0 /* gso_type */ 146 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* gso_type */ 147 #define VIRTIO_NET_HDR_GSO_UDP 3 /* gso_type */ 148 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* gso_type */ 149 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* gso_type, |'ed */ 150 151 #define VIRTIO_NET_MAX_GSO_LEN (65536+ETHER_HDR_LEN) 152 153 /* Control virtqueue */ 154 struct virtio_net_ctrl_cmd { 155 uint8_t class; 156 uint8_t command; 157 } __packed; 158 #define VIRTIO_NET_CTRL_RX 0 159 # define VIRTIO_NET_CTRL_RX_PROMISC 0 160 # define VIRTIO_NET_CTRL_RX_ALLMULTI 1 161 162 #define VIRTIO_NET_CTRL_MAC 1 163 # define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 164 # define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 165 166 #define VIRTIO_NET_CTRL_VLAN 2 167 # define VIRTIO_NET_CTRL_VLAN_ADD 0 168 # define VIRTIO_NET_CTRL_VLAN_DEL 1 169 170 #define VIRTIO_NET_CTRL_MQ 4 171 # define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 172 # define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 173 # define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 174 175 struct virtio_net_ctrl_status { 176 uint8_t ack; 177 } __packed; 178 #define VIRTIO_NET_OK 0 179 #define VIRTIO_NET_ERR 1 180 181 struct virtio_net_ctrl_rx { 182 uint8_t onoff; 183 } __packed; 184 185 struct virtio_net_ctrl_mac_tbl { 186 uint32_t nentries; 187 uint8_t macs[][ETHER_ADDR_LEN]; 188 } __packed; 189 190 struct virtio_net_ctrl_mac_addr { 191 uint8_t mac[ETHER_ADDR_LEN]; 192 } __packed; 193 194 struct virtio_net_ctrl_vlan { 195 uint16_t id; 196 } __packed; 197 198 struct virtio_net_ctrl_mq { 199 uint16_t virtqueue_pairs; 200 } __packed; 201 202 /* 203 * if_vioifvar.h: 204 */ 205 206 /* 207 * Locking notes: 208 * + a field in vioif_netqueue is protected by netq_lock (a spin mutex) 209 * - more than one lock cannot be held at onece 210 * + a field in vioif_tx_context and vioif_rx_context is also protected 211 * by netq_lock. 212 * + ctrlq_inuse is protected by ctrlq_wait_lock. 213 * - other fields in vioif_ctrlqueue are protected by ctrlq_inuse 214 * - netq_lock cannot be held along with ctrlq_wait_lock 215 * + fields in vioif_softc except queues are protected by 216 * sc->sc_lock(an adaptive mutex) 217 * - the lock is held before acquisition of other locks 218 */ 219 220 struct vioif_ctrl_cmdspec { 221 bus_dmamap_t dmamap; 222 void *buf; 223 bus_size_t bufsize; 224 }; 225 226 struct vioif_work { 227 struct work cookie; 228 void (*func)(void *); 229 void *arg; 230 unsigned int added; 231 }; 232 233 struct vioif_net_map { 234 struct virtio_net_hdr *vnm_hdr; 235 bus_dmamap_t vnm_hdr_map; 236 struct mbuf *vnm_mbuf; 237 bus_dmamap_t vnm_mbuf_map; 238 }; 239 240 #define VIOIF_NETQ_RX 0 241 #define VIOIF_NETQ_TX 1 242 #define VIOIF_NETQ_IDX 2 243 #define VIOIF_NETQ_DIR(n) ((n) % VIOIF_NETQ_IDX) 244 #define VIOIF_NETQ_PAIRIDX(n) ((n) / VIOIF_NETQ_IDX) 245 #define VIOIF_NETQ_RXQID(n) ((n) * VIOIF_NETQ_IDX + VIOIF_NETQ_RX) 246 #define VIOIF_NETQ_TXQID(n) ((n) * VIOIF_NETQ_IDX + VIOIF_NETQ_TX) 247 248 struct vioif_netqueue { 249 kmutex_t netq_lock; 250 struct virtqueue *netq_vq; 251 bool netq_stopping; 252 bool netq_running_handle; 253 void *netq_maps_kva; 254 struct vioif_net_map *netq_maps; 255 256 void *netq_softint; 257 struct vioif_work netq_work; 258 bool netq_workqueue; 259 260 char netq_evgroup[32]; 261 struct evcnt netq_mbuf_load_failed; 262 struct evcnt netq_enqueue_failed; 263 264 void *netq_ctx; 265 }; 266 267 struct vioif_tx_context { 268 bool txc_link_active; 269 bool txc_no_free_slots; 270 pcq_t *txc_intrq; 271 void *txc_deferred_transmit; 272 273 struct evcnt txc_defrag_failed; 274 }; 275 276 struct vioif_rx_context { 277 struct evcnt rxc_mbuf_enobufs; 278 }; 279 struct vioif_ctrlqueue { 280 struct virtqueue *ctrlq_vq; 281 enum { 282 FREE, INUSE, DONE 283 } ctrlq_inuse; 284 kcondvar_t ctrlq_wait; 285 kmutex_t ctrlq_wait_lock; 286 struct lwp *ctrlq_owner; 287 288 struct virtio_net_ctrl_cmd *ctrlq_cmd; 289 struct virtio_net_ctrl_status *ctrlq_status; 290 struct virtio_net_ctrl_rx *ctrlq_rx; 291 struct virtio_net_ctrl_mac_tbl *ctrlq_mac_tbl_uc; 292 struct virtio_net_ctrl_mac_tbl *ctrlq_mac_tbl_mc; 293 struct virtio_net_ctrl_mac_addr *ctrlq_mac_addr; 294 struct virtio_net_ctrl_mq *ctrlq_mq; 295 296 bus_dmamap_t ctrlq_cmd_dmamap; 297 bus_dmamap_t ctrlq_status_dmamap; 298 bus_dmamap_t ctrlq_rx_dmamap; 299 bus_dmamap_t ctrlq_tbl_uc_dmamap; 300 bus_dmamap_t ctrlq_tbl_mc_dmamap; 301 bus_dmamap_t ctrlq_mac_addr_dmamap; 302 bus_dmamap_t ctrlq_mq_dmamap; 303 304 struct evcnt ctrlq_cmd_load_failed; 305 struct evcnt ctrlq_cmd_failed; 306 }; 307 308 struct vioif_softc { 309 device_t sc_dev; 310 kmutex_t sc_lock; 311 struct sysctllog *sc_sysctllog; 312 313 struct virtio_softc *sc_virtio; 314 struct virtqueue *sc_vqs; 315 u_int sc_hdr_size; 316 317 int sc_max_nvq_pairs; 318 int sc_req_nvq_pairs; 319 int sc_act_nvq_pairs; 320 321 uint8_t sc_mac[ETHER_ADDR_LEN]; 322 struct ethercom sc_ethercom; 323 int sc_link_state; 324 325 struct vioif_netqueue *sc_netqs; 326 327 bool sc_has_ctrl; 328 struct vioif_ctrlqueue sc_ctrlq; 329 330 bus_dma_segment_t sc_segs[1]; 331 void *sc_dmamem; 332 void *sc_kmem; 333 334 void *sc_cfg_softint; 335 336 struct workqueue *sc_txrx_workqueue; 337 bool sc_txrx_workqueue_sysctl; 338 u_int sc_tx_intr_process_limit; 339 u_int sc_tx_process_limit; 340 u_int sc_rx_intr_process_limit; 341 u_int sc_rx_process_limit; 342 }; 343 #define VIRTIO_NET_TX_MAXNSEGS (16) /* XXX */ 344 #define VIRTIO_NET_CTRL_MAC_MAXENTRIES (64) /* XXX */ 345 346 #define VIOIF_TX_INTR_PROCESS_LIMIT 256 347 #define VIOIF_TX_PROCESS_LIMIT 256 348 #define VIOIF_RX_INTR_PROCESS_LIMIT 0U 349 #define VIOIF_RX_PROCESS_LIMIT 256 350 351 #define VIOIF_WORKQUEUE_PRI PRI_SOFTNET 352 #define VIOIF_IS_LINK_ACTIVE(_sc) ((_sc)->sc_link_state == LINK_STATE_UP ? \ 353 true : false) 354 355 /* cfattach interface functions */ 356 static int vioif_match(device_t, cfdata_t, void *); 357 static void vioif_attach(device_t, device_t, void *); 358 static int vioif_finalize_teardown(device_t); 359 360 /* ifnet interface functions */ 361 static int vioif_init(struct ifnet *); 362 static void vioif_stop(struct ifnet *, int); 363 static void vioif_start(struct ifnet *); 364 static int vioif_transmit(struct ifnet *, struct mbuf *); 365 static int vioif_ioctl(struct ifnet *, u_long, void *); 366 static void vioif_watchdog(struct ifnet *); 367 static int vioif_ifflags(struct vioif_softc *); 368 static int vioif_ifflags_cb(struct ethercom *); 369 370 /* tx & rx */ 371 static int vioif_netqueue_init(struct vioif_softc *, 372 struct virtio_softc *, size_t, u_int); 373 static void vioif_netqueue_teardown(struct vioif_softc *, 374 struct virtio_softc *, size_t); 375 static void vioif_net_intr_enable(struct vioif_softc *, 376 struct virtio_softc *); 377 static void vioif_net_intr_disable(struct vioif_softc *, 378 struct virtio_softc *); 379 static void vioif_net_sched_handle(struct vioif_softc *, 380 struct vioif_netqueue *); 381 382 /* rx */ 383 static void vioif_populate_rx_mbufs_locked(struct vioif_softc *, 384 struct vioif_netqueue *); 385 static int vioif_rx_intr(void *); 386 static void vioif_rx_handle(void *); 387 static void vioif_rx_queue_clear(struct vioif_softc *, 388 struct virtio_softc *, struct vioif_netqueue *); 389 390 /* tx */ 391 static void vioif_start_locked(struct ifnet *, struct vioif_netqueue *); 392 static void vioif_transmit_locked(struct ifnet *, struct vioif_netqueue *); 393 static void vioif_deferred_transmit(void *); 394 static int vioif_tx_intr(void *); 395 static void vioif_tx_handle(void *); 396 static void vioif_tx_queue_clear(struct vioif_softc *, struct virtio_softc *, 397 struct vioif_netqueue *); 398 399 /* controls */ 400 static int vioif_ctrl_intr(void *); 401 static int vioif_ctrl_rx(struct vioif_softc *, int, bool); 402 static int vioif_set_promisc(struct vioif_softc *, bool); 403 static int vioif_set_allmulti(struct vioif_softc *, bool); 404 static int vioif_set_rx_filter(struct vioif_softc *); 405 static int vioif_rx_filter(struct vioif_softc *); 406 static int vioif_set_mac_addr(struct vioif_softc *); 407 static int vioif_ctrl_mq_vq_pairs_set(struct vioif_softc *, int); 408 409 /* config interrupt */ 410 static int vioif_config_change(struct virtio_softc *); 411 static void vioif_cfg_softint(void *); 412 static void vioif_update_link_status(struct vioif_softc *); 413 414 /* others */ 415 static void vioif_alloc_queues(struct vioif_softc *); 416 static void vioif_free_queues(struct vioif_softc *); 417 static int vioif_alloc_mems(struct vioif_softc *); 418 static struct workqueue* 419 vioif_workq_create(const char *, pri_t, int, int); 420 static void vioif_workq_destroy(struct workqueue *); 421 static void vioif_work_set(struct vioif_work *, void(*)(void *), void *); 422 static void vioif_work_add(struct workqueue *, struct vioif_work *); 423 static void vioif_work_wait(struct workqueue *, struct vioif_work *); 424 static int vioif_setup_sysctl(struct vioif_softc *); 425 static void vioif_setup_stats(struct vioif_softc *); 426 427 CFATTACH_DECL_NEW(vioif, sizeof(struct vioif_softc), 428 vioif_match, vioif_attach, NULL, NULL); 429 430 static void 431 vioif_intr_barrier(void) 432 { 433 434 /* wait for finish all interrupt handler */ 435 xc_barrier(0); 436 } 437 438 static void 439 vioif_notify(struct virtio_softc *vsc, struct virtqueue *vq) 440 { 441 442 virtio_enqueue_commit(vsc, vq, -1, true); 443 } 444 445 static int 446 vioif_match(device_t parent, cfdata_t match, void *aux) 447 { 448 struct virtio_attach_args *va = aux; 449 450 if (va->sc_childdevid == VIRTIO_DEVICE_ID_NETWORK) 451 return 1; 452 453 return 0; 454 } 455 456 static void 457 vioif_attach(device_t parent, device_t self, void *aux) 458 { 459 struct vioif_softc *sc = device_private(self); 460 struct virtio_softc *vsc = device_private(parent); 461 struct vioif_netqueue *txq0; 462 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 463 uint64_t features, req_features; 464 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 465 u_int softint_flags; 466 int r, i, req_flags; 467 char xnamebuf[MAXCOMLEN]; 468 size_t nvqs; 469 470 if (virtio_child(vsc) != NULL) { 471 aprint_normal(": child already attached for %s; " 472 "something wrong...\n", device_xname(parent)); 473 return; 474 } 475 476 sc->sc_dev = self; 477 sc->sc_virtio = vsc; 478 sc->sc_link_state = LINK_STATE_UNKNOWN; 479 480 sc->sc_max_nvq_pairs = 1; 481 sc->sc_req_nvq_pairs = 1; 482 sc->sc_act_nvq_pairs = 1; 483 sc->sc_txrx_workqueue_sysctl = true; 484 sc->sc_tx_intr_process_limit = VIOIF_TX_INTR_PROCESS_LIMIT; 485 sc->sc_tx_process_limit = VIOIF_TX_PROCESS_LIMIT; 486 sc->sc_rx_intr_process_limit = VIOIF_RX_INTR_PROCESS_LIMIT; 487 sc->sc_rx_process_limit = VIOIF_RX_PROCESS_LIMIT; 488 489 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 490 491 snprintf(xnamebuf, sizeof(xnamebuf), "%s_txrx", device_xname(self)); 492 sc->sc_txrx_workqueue = vioif_workq_create(xnamebuf, VIOIF_WORKQUEUE_PRI, 493 IPL_NET, WQ_PERCPU | WQ_MPSAFE); 494 if (sc->sc_txrx_workqueue == NULL) 495 goto err; 496 497 req_flags = 0; 498 499 #ifdef VIOIF_MPSAFE 500 req_flags |= VIRTIO_F_INTR_MPSAFE; 501 #endif 502 req_flags |= VIRTIO_F_INTR_MSIX; 503 504 req_features = 505 VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS | VIRTIO_NET_F_CTRL_VQ | 506 VIRTIO_NET_F_CTRL_RX | VIRTIO_F_NOTIFY_ON_EMPTY; 507 req_features |= VIRTIO_F_RING_EVENT_IDX; 508 req_features |= VIRTIO_NET_F_CTRL_MAC_ADDR; 509 #ifdef VIOIF_MULTIQ 510 req_features |= VIRTIO_NET_F_MQ; 511 #endif 512 513 virtio_child_attach_start(vsc, self, IPL_NET, 514 req_features, VIRTIO_NET_FLAG_BITS); 515 features = virtio_features(vsc); 516 517 if (features == 0) 518 goto err; 519 520 if (features & VIRTIO_NET_F_MAC) { 521 for (i = 0; i < __arraycount(sc->sc_mac); i++) { 522 sc->sc_mac[i] = virtio_read_device_config_1(vsc, 523 VIRTIO_NET_CONFIG_MAC + i); 524 } 525 } else { 526 /* code stolen from sys/net/if_tap.c */ 527 struct timeval tv; 528 uint32_t ui; 529 getmicrouptime(&tv); 530 ui = (tv.tv_sec ^ tv.tv_usec) & 0xffffff; 531 memcpy(sc->sc_mac+3, (uint8_t *)&ui, 3); 532 for (i = 0; i < __arraycount(sc->sc_mac); i++) { 533 virtio_write_device_config_1(vsc, 534 VIRTIO_NET_CONFIG_MAC + i, sc->sc_mac[i]); 535 } 536 } 537 538 /* 'Ethernet' with capital follows other ethernet driver attachment */ 539 aprint_normal_dev(self, "Ethernet address %s\n", 540 ether_sprintf(sc->sc_mac)); 541 542 if (features & (VIRTIO_NET_F_MRG_RXBUF | VIRTIO_F_VERSION_1)) { 543 sc->sc_hdr_size = sizeof(struct virtio_net_hdr); 544 } else { 545 sc->sc_hdr_size = offsetof(struct virtio_net_hdr, num_buffers); 546 } 547 548 if ((features & VIRTIO_NET_F_CTRL_VQ) && 549 (features & VIRTIO_NET_F_CTRL_RX)) { 550 sc->sc_has_ctrl = true; 551 552 cv_init(&ctrlq->ctrlq_wait, "ctrl_vq"); 553 mutex_init(&ctrlq->ctrlq_wait_lock, MUTEX_DEFAULT, IPL_NET); 554 ctrlq->ctrlq_inuse = FREE; 555 } else { 556 sc->sc_has_ctrl = false; 557 } 558 559 if (sc->sc_has_ctrl && (features & VIRTIO_NET_F_MQ)) { 560 sc->sc_max_nvq_pairs = virtio_read_device_config_2(vsc, 561 VIRTIO_NET_CONFIG_MAX_VQ_PAIRS); 562 563 if (sc->sc_max_nvq_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX) 564 goto err; 565 566 /* Limit the number of queue pairs to use */ 567 sc->sc_req_nvq_pairs = MIN(sc->sc_max_nvq_pairs, ncpu); 568 569 if (sc->sc_max_nvq_pairs > 1) 570 req_flags |= VIRTIO_F_INTR_PERVQ; 571 } 572 573 vioif_alloc_queues(sc); 574 575 #ifdef VIOIF_MPSAFE 576 softint_flags = SOFTINT_NET | SOFTINT_MPSAFE; 577 #else 578 softint_flags = SOFTINT_NET; 579 #endif 580 581 /* 582 * Initialize network queues 583 */ 584 nvqs = sc->sc_max_nvq_pairs * 2; 585 for (i = 0; i < nvqs; i++) { 586 r = vioif_netqueue_init(sc, vsc, i, softint_flags); 587 if (r != 0) 588 goto err; 589 } 590 591 if (sc->sc_has_ctrl) { 592 int ctrlq_idx = nvqs; 593 594 nvqs++; 595 /* 596 * Allocating a virtqueue for control channel 597 */ 598 sc->sc_ctrlq.ctrlq_vq = &sc->sc_vqs[ctrlq_idx]; 599 virtio_init_vq(vsc, ctrlq->ctrlq_vq, ctrlq_idx, 600 vioif_ctrl_intr, ctrlq); 601 602 r = virtio_alloc_vq(vsc, ctrlq->ctrlq_vq, NBPG, 1, "control"); 603 if (r != 0) { 604 aprint_error_dev(self, "failed to allocate " 605 "a virtqueue for control channel, error code %d\n", 606 r); 607 608 sc->sc_has_ctrl = false; 609 cv_destroy(&ctrlq->ctrlq_wait); 610 mutex_destroy(&ctrlq->ctrlq_wait_lock); 611 } 612 } 613 614 sc->sc_cfg_softint = softint_establish(softint_flags, 615 vioif_cfg_softint, sc); 616 if (sc->sc_cfg_softint == NULL) { 617 aprint_error_dev(self, "cannot establish ctl softint\n"); 618 goto err; 619 } 620 621 if (vioif_alloc_mems(sc) < 0) 622 goto err; 623 624 r = virtio_child_attach_finish(vsc, sc->sc_vqs, nvqs, 625 vioif_config_change, req_flags); 626 if (r != 0) 627 goto err; 628 629 if (vioif_setup_sysctl(sc) != 0) { 630 aprint_error_dev(self, "unable to create sysctl node\n"); 631 /* continue */ 632 } 633 634 vioif_setup_stats(sc); 635 636 strlcpy(ifp->if_xname, device_xname(self), IFNAMSIZ); 637 ifp->if_softc = sc; 638 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 639 #ifdef VIOIF_MPSAFE 640 ifp->if_extflags = IFEF_MPSAFE; 641 #endif 642 ifp->if_start = vioif_start; 643 if (sc->sc_req_nvq_pairs > 1) 644 ifp->if_transmit = vioif_transmit; 645 ifp->if_ioctl = vioif_ioctl; 646 ifp->if_init = vioif_init; 647 ifp->if_stop = vioif_stop; 648 ifp->if_capabilities = 0; 649 ifp->if_watchdog = vioif_watchdog; 650 txq0 = &sc->sc_netqs[VIOIF_NETQ_TXQID(0)]; 651 IFQ_SET_MAXLEN(&ifp->if_snd, MAX(txq0->netq_vq->vq_num, IFQ_MAXLEN)); 652 IFQ_SET_READY(&ifp->if_snd); 653 654 sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; 655 656 if_attach(ifp); 657 if_deferred_start_init(ifp, NULL); 658 ether_ifattach(ifp, sc->sc_mac); 659 ether_set_ifflags_cb(&sc->sc_ethercom, vioif_ifflags_cb); 660 661 return; 662 663 err: 664 nvqs = sc->sc_max_nvq_pairs * 2; 665 for (i = 0; i < nvqs; i++) { 666 vioif_netqueue_teardown(sc, vsc, i); 667 } 668 669 if (sc->sc_has_ctrl) { 670 cv_destroy(&ctrlq->ctrlq_wait); 671 mutex_destroy(&ctrlq->ctrlq_wait_lock); 672 virtio_free_vq(vsc, ctrlq->ctrlq_vq); 673 ctrlq->ctrlq_vq = NULL; 674 } 675 676 vioif_free_queues(sc); 677 mutex_destroy(&sc->sc_lock); 678 virtio_child_attach_failed(vsc); 679 config_finalize_register(self, vioif_finalize_teardown); 680 681 return; 682 } 683 684 static int 685 vioif_finalize_teardown(device_t self) 686 { 687 struct vioif_softc *sc = device_private(self); 688 689 if (sc->sc_txrx_workqueue != NULL) { 690 vioif_workq_destroy(sc->sc_txrx_workqueue); 691 sc->sc_txrx_workqueue = NULL; 692 } 693 694 return 0; 695 } 696 697 /* 698 * Interface functions for ifnet 699 */ 700 static int 701 vioif_init(struct ifnet *ifp) 702 { 703 struct vioif_softc *sc = ifp->if_softc; 704 struct virtio_softc *vsc = sc->sc_virtio; 705 struct vioif_netqueue *netq; 706 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 707 int r, i; 708 709 vioif_stop(ifp, 0); 710 711 r = virtio_reinit_start(vsc); 712 if (r != 0) { 713 log(LOG_ERR, "%s: reset failed\n", ifp->if_xname); 714 return EIO; 715 } 716 717 virtio_negotiate_features(vsc, virtio_features(vsc)); 718 719 for (i = 0; i < sc->sc_req_nvq_pairs; i++) { 720 netq = &sc->sc_netqs[VIOIF_NETQ_RXQID(i)]; 721 722 mutex_enter(&netq->netq_lock); 723 vioif_populate_rx_mbufs_locked(sc, netq); 724 mutex_exit(&netq->netq_lock); 725 } 726 727 virtio_reinit_end(vsc); 728 729 if (sc->sc_has_ctrl) 730 virtio_start_vq_intr(vsc, ctrlq->ctrlq_vq); 731 732 r = vioif_ctrl_mq_vq_pairs_set(sc, sc->sc_req_nvq_pairs); 733 if (r == 0) 734 sc->sc_act_nvq_pairs = sc->sc_req_nvq_pairs; 735 else 736 sc->sc_act_nvq_pairs = 1; 737 738 SET(ifp->if_flags, IFF_RUNNING); 739 740 vioif_net_intr_enable(sc, vsc); 741 742 vioif_update_link_status(sc); 743 r = vioif_rx_filter(sc); 744 745 return r; 746 } 747 748 static void 749 vioif_stop(struct ifnet *ifp, int disable) 750 { 751 struct vioif_softc *sc = ifp->if_softc; 752 struct virtio_softc *vsc = sc->sc_virtio; 753 struct vioif_netqueue *netq; 754 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 755 size_t i, act_qnum; 756 757 act_qnum = sc->sc_act_nvq_pairs * 2; 758 759 CLR(ifp->if_flags, IFF_RUNNING); 760 for (i = 0; i < act_qnum; i++) { 761 netq = &sc->sc_netqs[i]; 762 763 mutex_enter(&netq->netq_lock); 764 netq->netq_stopping = true; 765 mutex_exit(&netq->netq_lock); 766 } 767 768 /* disable interrupts */ 769 vioif_net_intr_disable(sc, vsc); 770 if (sc->sc_has_ctrl) 771 virtio_stop_vq_intr(vsc, ctrlq->ctrlq_vq); 772 773 /* 774 * only way to stop interrupt, I/O and DMA is resetting... 775 * 776 * NOTE: Devices based on VirtIO draft specification can not 777 * stop interrupt completely even if virtio_stop_vq_intr() is called. 778 */ 779 virtio_reset(vsc); 780 781 vioif_intr_barrier(); 782 783 for (i = 0; i < act_qnum; i++) { 784 netq = &sc->sc_netqs[i]; 785 vioif_work_wait(sc->sc_txrx_workqueue, &netq->netq_work); 786 } 787 788 for (i = 0; i < sc->sc_act_nvq_pairs; i++) { 789 netq = &sc->sc_netqs[VIOIF_NETQ_RXQID(i)]; 790 vioif_rx_queue_clear(sc, vsc, netq); 791 792 netq = &sc->sc_netqs[VIOIF_NETQ_TXQID(i)]; 793 vioif_tx_queue_clear(sc, vsc, netq); 794 } 795 796 /* all packet processing is stopped */ 797 for (i = 0; i < act_qnum; i++) { 798 netq = &sc->sc_netqs[i]; 799 800 mutex_enter(&netq->netq_lock); 801 netq->netq_stopping = false; 802 mutex_exit(&netq->netq_lock); 803 } 804 } 805 806 static void 807 vioif_start(struct ifnet *ifp) 808 { 809 struct vioif_softc *sc = ifp->if_softc; 810 struct vioif_netqueue *txq0 = &sc->sc_netqs[VIOIF_NETQ_TXQID(0)]; 811 812 #ifdef VIOIF_MPSAFE 813 KASSERT(if_is_mpsafe(ifp)); 814 #endif 815 816 mutex_enter(&txq0->netq_lock); 817 vioif_start_locked(ifp, txq0); 818 mutex_exit(&txq0->netq_lock); 819 } 820 821 static inline int 822 vioif_select_txqueue(struct ifnet *ifp, struct mbuf *m) 823 { 824 struct vioif_softc *sc = ifp->if_softc; 825 u_int cpuid = cpu_index(curcpu()); 826 827 return VIOIF_NETQ_TXQID(cpuid % sc->sc_act_nvq_pairs); 828 } 829 830 static int 831 vioif_transmit(struct ifnet *ifp, struct mbuf *m) 832 { 833 struct vioif_softc *sc = ifp->if_softc; 834 struct vioif_netqueue *netq; 835 struct vioif_tx_context *txc; 836 int qid; 837 838 qid = vioif_select_txqueue(ifp, m); 839 netq = &sc->sc_netqs[qid]; 840 txc = netq->netq_ctx; 841 842 if (__predict_false(!pcq_put(txc->txc_intrq, m))) { 843 m_freem(m); 844 return ENOBUFS; 845 } 846 847 net_stat_ref_t nsr = IF_STAT_GETREF(ifp); 848 if_statadd_ref(ifp, nsr, if_obytes, m->m_pkthdr.len); 849 if (m->m_flags & M_MCAST) 850 if_statinc_ref(ifp, nsr, if_omcasts); 851 IF_STAT_PUTREF(ifp); 852 853 if (mutex_tryenter(&netq->netq_lock)) { 854 vioif_transmit_locked(ifp, netq); 855 mutex_exit(&netq->netq_lock); 856 } 857 858 return 0; 859 } 860 861 void 862 vioif_watchdog(struct ifnet *ifp) 863 { 864 struct vioif_softc *sc = ifp->if_softc; 865 struct vioif_netqueue *netq; 866 int i; 867 868 if (ISSET(ifp->if_flags, IFF_RUNNING)) { 869 if (ISSET(ifp->if_flags, IFF_DEBUG)) { 870 log(LOG_DEBUG, "%s: watchdog timed out\n", 871 ifp->if_xname); 872 } 873 874 for (i = 0; i < sc->sc_act_nvq_pairs; i++) { 875 netq = &sc->sc_netqs[VIOIF_NETQ_TXQID(i)]; 876 877 mutex_enter(&netq->netq_lock); 878 if (!netq->netq_running_handle) { 879 netq->netq_running_handle = true; 880 vioif_net_sched_handle(sc, netq); 881 } 882 mutex_exit(&netq->netq_lock); 883 } 884 } 885 } 886 887 static int 888 vioif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 889 { 890 int s, r; 891 892 s = splnet(); 893 894 r = ether_ioctl(ifp, cmd, data); 895 if (r == ENETRESET && (cmd == SIOCADDMULTI || cmd == SIOCDELMULTI)) { 896 if (ifp->if_flags & IFF_RUNNING) { 897 r = vioif_rx_filter(ifp->if_softc); 898 } else { 899 r = 0; 900 } 901 } 902 903 splx(s); 904 905 return r; 906 } 907 908 static int 909 vioif_ifflags(struct vioif_softc *sc) 910 { 911 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 912 bool onoff; 913 int r; 914 915 if (!sc->sc_has_ctrl) { 916 /* no ctrl vq; always promisc and allmulti */ 917 ifp->if_flags |= (IFF_PROMISC | IFF_ALLMULTI); 918 return 0; 919 } 920 921 onoff = ifp->if_flags & IFF_ALLMULTI ? true : false; 922 r = vioif_set_allmulti(sc, onoff); 923 if (r != 0) { 924 log(LOG_WARNING, 925 "%s: couldn't %sable ALLMULTI\n", 926 ifp->if_xname, onoff ? "en" : "dis"); 927 if (onoff) { 928 CLR(ifp->if_flags, IFF_ALLMULTI); 929 } else { 930 SET(ifp->if_flags, IFF_ALLMULTI); 931 } 932 } 933 934 onoff = ifp->if_flags & IFF_PROMISC ? true : false; 935 r = vioif_set_promisc(sc, onoff); 936 if (r != 0) { 937 log(LOG_WARNING, 938 "%s: couldn't %sable PROMISC\n", 939 ifp->if_xname, onoff ? "en" : "dis"); 940 if (onoff) { 941 CLR(ifp->if_flags, IFF_PROMISC); 942 } else { 943 SET(ifp->if_flags, IFF_PROMISC); 944 } 945 } 946 947 return 0; 948 } 949 950 static int 951 vioif_ifflags_cb(struct ethercom *ec) 952 { 953 struct ifnet *ifp = &ec->ec_if; 954 struct vioif_softc *sc = ifp->if_softc; 955 956 return vioif_ifflags(sc); 957 } 958 959 static int 960 vioif_setup_sysctl(struct vioif_softc *sc) 961 { 962 const char *devname; 963 struct sysctllog **log; 964 const struct sysctlnode *rnode, *rxnode, *txnode; 965 int error; 966 967 log = &sc->sc_sysctllog; 968 devname = device_xname(sc->sc_dev); 969 970 error = sysctl_createv(log, 0, NULL, &rnode, 971 0, CTLTYPE_NODE, devname, 972 SYSCTL_DESCR("virtio-net information and settings"), 973 NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL); 974 if (error) 975 goto out; 976 977 error = sysctl_createv(log, 0, &rnode, NULL, 978 CTLFLAG_READWRITE, CTLTYPE_BOOL, "txrx_workqueue", 979 SYSCTL_DESCR("Use workqueue for packet processing"), 980 NULL, 0, &sc->sc_txrx_workqueue_sysctl, 0, CTL_CREATE, CTL_EOL); 981 if (error) 982 goto out; 983 984 error = sysctl_createv(log, 0, &rnode, &rxnode, 985 0, CTLTYPE_NODE, "rx", 986 SYSCTL_DESCR("virtio-net information and settings for Rx"), 987 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 988 if (error) 989 goto out; 990 991 error = sysctl_createv(log, 0, &rxnode, NULL, 992 CTLFLAG_READWRITE, CTLTYPE_INT, "intr_process_limit", 993 SYSCTL_DESCR("max number of Rx packets to process for interrupt processing"), 994 NULL, 0, &sc->sc_rx_intr_process_limit, 0, CTL_CREATE, CTL_EOL); 995 if (error) 996 goto out; 997 998 error = sysctl_createv(log, 0, &rxnode, NULL, 999 CTLFLAG_READWRITE, CTLTYPE_INT, "process_limit", 1000 SYSCTL_DESCR("max number of Rx packets to process for deferred processing"), 1001 NULL, 0, &sc->sc_rx_process_limit, 0, CTL_CREATE, CTL_EOL); 1002 if (error) 1003 goto out; 1004 1005 error = sysctl_createv(log, 0, &rnode, &txnode, 1006 0, CTLTYPE_NODE, "tx", 1007 SYSCTL_DESCR("virtio-net information and settings for Tx"), 1008 NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL); 1009 if (error) 1010 goto out; 1011 1012 error = sysctl_createv(log, 0, &txnode, NULL, 1013 CTLFLAG_READWRITE, CTLTYPE_INT, "intr_process_limit", 1014 SYSCTL_DESCR("max number of Tx packets to process for interrupt processing"), 1015 NULL, 0, &sc->sc_tx_intr_process_limit, 0, CTL_CREATE, CTL_EOL); 1016 if (error) 1017 goto out; 1018 1019 error = sysctl_createv(log, 0, &txnode, NULL, 1020 CTLFLAG_READWRITE, CTLTYPE_INT, "process_limit", 1021 SYSCTL_DESCR("max number of Tx packets to process for deferred processing"), 1022 NULL, 0, &sc->sc_tx_process_limit, 0, CTL_CREATE, CTL_EOL); 1023 1024 out: 1025 if (error) 1026 sysctl_teardown(log); 1027 1028 return error; 1029 } 1030 1031 static void 1032 vioif_setup_stats(struct vioif_softc *sc) 1033 { 1034 struct vioif_netqueue *netq; 1035 struct vioif_tx_context *txc; 1036 struct vioif_rx_context *rxc; 1037 size_t i, netq_num; 1038 1039 netq_num = sc->sc_max_nvq_pairs * 2; 1040 for (i = 0; i < netq_num; i++) { 1041 netq = &sc->sc_netqs[i]; 1042 evcnt_attach_dynamic(&netq->netq_mbuf_load_failed, EVCNT_TYPE_MISC, 1043 NULL, netq->netq_evgroup, "failed to load mbuf to DMA"); 1044 evcnt_attach_dynamic(&netq->netq_enqueue_failed, 1045 EVCNT_TYPE_MISC, NULL, netq->netq_evgroup, 1046 "virtqueue enqueue failed failed"); 1047 1048 switch (VIOIF_NETQ_DIR(i)) { 1049 case VIOIF_NETQ_RX: 1050 rxc = netq->netq_ctx; 1051 evcnt_attach_dynamic(&rxc->rxc_mbuf_enobufs, 1052 EVCNT_TYPE_MISC, NULL, netq->netq_evgroup, 1053 "no receive buffer"); 1054 break; 1055 case VIOIF_NETQ_TX: 1056 txc = netq->netq_ctx; 1057 evcnt_attach_dynamic(&txc->txc_defrag_failed, 1058 EVCNT_TYPE_MISC, NULL, netq->netq_evgroup, 1059 "m_defrag() failed"); 1060 break; 1061 } 1062 } 1063 1064 evcnt_attach_dynamic(&sc->sc_ctrlq.ctrlq_cmd_load_failed, EVCNT_TYPE_MISC, 1065 NULL, device_xname(sc->sc_dev), "control command dmamap load failed"); 1066 evcnt_attach_dynamic(&sc->sc_ctrlq.ctrlq_cmd_failed, EVCNT_TYPE_MISC, 1067 NULL, device_xname(sc->sc_dev), "control command failed"); 1068 } 1069 1070 /* 1071 * allocate memory 1072 */ 1073 static int 1074 vioif_dmamap_create(struct vioif_softc *sc, bus_dmamap_t *map, 1075 bus_size_t size, int nsegs, const char *usage) 1076 { 1077 int r; 1078 1079 r = bus_dmamap_create(virtio_dmat(sc->sc_virtio), size, 1080 nsegs, size, 0, BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, map); 1081 1082 if (r != 0) { 1083 aprint_error_dev(sc->sc_dev, "%s dmamap creation failed, " 1084 "error code %d\n", usage, r); 1085 } 1086 1087 return r; 1088 } 1089 1090 static void 1091 vioif_dmamap_destroy(struct vioif_softc *sc, bus_dmamap_t *map) 1092 { 1093 1094 if (*map) { 1095 bus_dmamap_destroy(virtio_dmat(sc->sc_virtio), *map); 1096 *map = NULL; 1097 } 1098 } 1099 1100 static int 1101 vioif_dmamap_create_load(struct vioif_softc *sc, bus_dmamap_t *map, 1102 void *buf, bus_size_t size, int nsegs, int rw, const char *usage) 1103 { 1104 int r; 1105 1106 r = vioif_dmamap_create(sc, map, size, nsegs, usage); 1107 if (r != 0) 1108 return 1; 1109 1110 r = bus_dmamap_load(virtio_dmat(sc->sc_virtio), *map, buf, 1111 size, NULL, rw | BUS_DMA_NOWAIT); 1112 if (r != 0) { 1113 vioif_dmamap_destroy(sc, map); 1114 aprint_error_dev(sc->sc_dev, "%s dmamap load failed. " 1115 "error code %d\n", usage, r); 1116 } 1117 1118 return r; 1119 } 1120 1121 static void * 1122 vioif_assign_mem(intptr_t *p, size_t size) 1123 { 1124 intptr_t rv; 1125 1126 rv = *p; 1127 *p += size; 1128 1129 return (void *)rv; 1130 } 1131 1132 /* 1133 * dma memory is used for: 1134 * netq_maps_kva: metadata array for received frames (READ) and 1135 * sent frames (WRITE) 1136 * ctrlq_cmd: command to be sent via ctrl vq (WRITE) 1137 * ctrlq_status: return value for a command via ctrl vq (READ) 1138 * ctrlq_rx: parameter for a VIRTIO_NET_CTRL_RX class command 1139 * (WRITE) 1140 * ctrlq_mac_tbl_uc: unicast MAC address filter for a VIRTIO_NET_CTRL_MAC 1141 * class command (WRITE) 1142 * ctrlq_mac_tbl_mc: multicast MAC address filter for a VIRTIO_NET_CTRL_MAC 1143 * class command (WRITE) 1144 * ctrlq_* structures are allocated only one each; they are protected by 1145 * ctrlq_inuse variable and ctrlq_wait condvar. 1146 */ 1147 static int 1148 vioif_alloc_mems(struct vioif_softc *sc) 1149 { 1150 struct virtio_softc *vsc = sc->sc_virtio; 1151 struct vioif_netqueue *netq; 1152 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 1153 struct vioif_net_map *maps; 1154 unsigned int vq_num; 1155 int r, rsegs; 1156 bus_size_t dmamemsize; 1157 size_t qid, i, netq_num, kmemsize; 1158 void *vaddr; 1159 intptr_t p; 1160 1161 netq_num = sc->sc_max_nvq_pairs * 2; 1162 1163 /* allocate DMA memory */ 1164 dmamemsize = 0; 1165 1166 for (qid = 0; qid < netq_num; qid++) { 1167 maps = sc->sc_netqs[qid].netq_maps; 1168 vq_num = sc->sc_netqs[qid].netq_vq->vq_num; 1169 dmamemsize += sizeof(*maps[0].vnm_hdr) * vq_num; 1170 } 1171 1172 if (sc->sc_has_ctrl) { 1173 dmamemsize += sizeof(struct virtio_net_ctrl_cmd); 1174 dmamemsize += sizeof(struct virtio_net_ctrl_status); 1175 dmamemsize += sizeof(struct virtio_net_ctrl_rx); 1176 dmamemsize += sizeof(struct virtio_net_ctrl_mac_tbl) 1177 + ETHER_ADDR_LEN; 1178 dmamemsize += sizeof(struct virtio_net_ctrl_mac_tbl) 1179 + ETHER_ADDR_LEN * VIRTIO_NET_CTRL_MAC_MAXENTRIES; 1180 dmamemsize += sizeof(struct virtio_net_ctrl_mac_addr); 1181 dmamemsize += sizeof(struct virtio_net_ctrl_mq); 1182 } 1183 1184 r = bus_dmamem_alloc(virtio_dmat(vsc), dmamemsize, 0, 0, 1185 &sc->sc_segs[0], 1, &rsegs, BUS_DMA_NOWAIT); 1186 if (r != 0) { 1187 aprint_error_dev(sc->sc_dev, 1188 "DMA memory allocation failed, size %" PRIuBUSSIZE ", " 1189 "error code %d\n", dmamemsize, r); 1190 goto err_none; 1191 } 1192 r = bus_dmamem_map(virtio_dmat(vsc), &sc->sc_segs[0], 1, 1193 dmamemsize, &vaddr, BUS_DMA_NOWAIT); 1194 if (r != 0) { 1195 aprint_error_dev(sc->sc_dev, 1196 "DMA memory map failed, error code %d\n", r); 1197 goto err_dmamem_alloc; 1198 } 1199 1200 /* assign DMA memory */ 1201 memset(vaddr, 0, dmamemsize); 1202 sc->sc_dmamem = vaddr; 1203 p = (intptr_t) vaddr; 1204 1205 for (qid = 0; qid < netq_num; qid++) { 1206 netq = &sc->sc_netqs[qid]; 1207 maps = netq->netq_maps; 1208 vq_num = netq->netq_vq->vq_num; 1209 1210 netq->netq_maps_kva = vioif_assign_mem(&p, 1211 sizeof(*maps[0].vnm_hdr) * vq_num); 1212 } 1213 1214 if (sc->sc_has_ctrl) { 1215 ctrlq->ctrlq_cmd = vioif_assign_mem(&p, 1216 sizeof(*ctrlq->ctrlq_cmd)); 1217 ctrlq->ctrlq_status = vioif_assign_mem(&p, 1218 sizeof(*ctrlq->ctrlq_status)); 1219 ctrlq->ctrlq_rx = vioif_assign_mem(&p, 1220 sizeof(*ctrlq->ctrlq_rx)); 1221 ctrlq->ctrlq_mac_tbl_uc = vioif_assign_mem(&p, 1222 sizeof(*ctrlq->ctrlq_mac_tbl_uc) 1223 + ETHER_ADDR_LEN); 1224 ctrlq->ctrlq_mac_tbl_mc = vioif_assign_mem(&p, 1225 sizeof(*ctrlq->ctrlq_mac_tbl_mc) 1226 + ETHER_ADDR_LEN * VIRTIO_NET_CTRL_MAC_MAXENTRIES); 1227 ctrlq->ctrlq_mac_addr = vioif_assign_mem(&p, 1228 sizeof(*ctrlq->ctrlq_mac_addr)); 1229 ctrlq->ctrlq_mq = vioif_assign_mem(&p, sizeof(*ctrlq->ctrlq_mq)); 1230 } 1231 1232 /* allocate kmem */ 1233 kmemsize = 0; 1234 1235 for (qid = 0; qid < netq_num; qid++) { 1236 netq = &sc->sc_netqs[qid]; 1237 vq_num = netq->netq_vq->vq_num; 1238 1239 kmemsize += sizeof(netq->netq_maps[0]) * vq_num; 1240 } 1241 1242 vaddr = kmem_zalloc(kmemsize, KM_SLEEP); 1243 sc->sc_kmem = vaddr; 1244 1245 /* assign allocated kmem */ 1246 p = (intptr_t) vaddr; 1247 1248 for (qid = 0; qid < netq_num; qid++) { 1249 netq = &sc->sc_netqs[qid]; 1250 vq_num = netq->netq_vq->vq_num; 1251 1252 netq->netq_maps = vioif_assign_mem(&p, 1253 sizeof(netq->netq_maps[0]) * vq_num); 1254 } 1255 1256 /* prepare dmamaps */ 1257 for (qid = 0; qid < netq_num; qid++) { 1258 static const struct { 1259 const char *msg_hdr; 1260 const char *msg_payload; 1261 int dma_flag; 1262 bus_size_t dma_size; 1263 int dma_nsegs; 1264 } dmaparams[VIOIF_NETQ_IDX] = { 1265 [VIOIF_NETQ_RX] = { 1266 .msg_hdr = "rx header", 1267 .msg_payload = "rx payload", 1268 .dma_flag = BUS_DMA_READ, 1269 .dma_size = MCLBYTES - ETHER_ALIGN, 1270 .dma_nsegs = 1, 1271 }, 1272 [VIOIF_NETQ_TX] = { 1273 .msg_hdr = "tx header", 1274 .msg_payload = "tx payload", 1275 .dma_flag = BUS_DMA_WRITE, 1276 .dma_size = ETHER_MAX_LEN, 1277 .dma_nsegs = VIRTIO_NET_TX_MAXNSEGS, 1278 } 1279 }; 1280 1281 struct virtio_net_hdr *hdrs; 1282 int dir; 1283 int nsegs; 1284 1285 dir = VIOIF_NETQ_DIR(qid); 1286 netq = &sc->sc_netqs[qid]; 1287 vq_num = netq->netq_vq->vq_num; 1288 maps = netq->netq_maps; 1289 hdrs = netq->netq_maps_kva; 1290 nsegs = uimin(dmaparams[dir].dma_nsegs, vq_num - 1/*hdr*/); 1291 1292 for (i = 0; i < vq_num; i++) { 1293 maps[i].vnm_hdr = &hdrs[i]; 1294 1295 r = vioif_dmamap_create_load(sc, &maps[i].vnm_hdr_map, 1296 maps[i].vnm_hdr, sc->sc_hdr_size, 1, 1297 dmaparams[dir].dma_flag, dmaparams[dir].msg_hdr); 1298 if (r != 0) 1299 goto err_reqs; 1300 1301 r = vioif_dmamap_create(sc, &maps[i].vnm_mbuf_map, 1302 dmaparams[dir].dma_size, nsegs, 1303 dmaparams[dir].msg_payload); 1304 if (r != 0) 1305 goto err_reqs; 1306 } 1307 } 1308 1309 if (sc->sc_has_ctrl) { 1310 /* control vq class & command */ 1311 r = vioif_dmamap_create_load(sc, &ctrlq->ctrlq_cmd_dmamap, 1312 ctrlq->ctrlq_cmd, sizeof(*ctrlq->ctrlq_cmd), 1, 1313 BUS_DMA_WRITE, "control command"); 1314 if (r != 0) 1315 goto err_reqs; 1316 1317 r = vioif_dmamap_create_load(sc, &ctrlq->ctrlq_status_dmamap, 1318 ctrlq->ctrlq_status, sizeof(*ctrlq->ctrlq_status), 1, 1319 BUS_DMA_READ, "control status"); 1320 if (r != 0) 1321 goto err_reqs; 1322 1323 /* control vq rx mode command parameter */ 1324 r = vioif_dmamap_create_load(sc, &ctrlq->ctrlq_rx_dmamap, 1325 ctrlq->ctrlq_rx, sizeof(*ctrlq->ctrlq_rx), 1, 1326 BUS_DMA_WRITE, "rx mode control command"); 1327 if (r != 0) 1328 goto err_reqs; 1329 1330 /* multiqueue set command */ 1331 r = vioif_dmamap_create_load(sc, &ctrlq->ctrlq_mq_dmamap, 1332 ctrlq->ctrlq_mq, sizeof(*ctrlq->ctrlq_mq), 1, 1333 BUS_DMA_WRITE, "multiqueue set command"); 1334 if (r != 0) 1335 goto err_reqs; 1336 1337 /* control vq MAC filter table for unicast */ 1338 /* do not load now since its length is variable */ 1339 r = vioif_dmamap_create(sc, &ctrlq->ctrlq_tbl_uc_dmamap, 1340 sizeof(*ctrlq->ctrlq_mac_tbl_uc) 1341 + ETHER_ADDR_LEN, 1, 1342 "unicast MAC address filter command"); 1343 if (r != 0) 1344 goto err_reqs; 1345 1346 /* control vq MAC filter table for multicast */ 1347 r = vioif_dmamap_create(sc, &ctrlq->ctrlq_tbl_mc_dmamap, 1348 sizeof(*ctrlq->ctrlq_mac_tbl_mc) 1349 + ETHER_ADDR_LEN * VIRTIO_NET_CTRL_MAC_MAXENTRIES, 1, 1350 "multicast MAC address filter command"); 1351 if (r != 0) 1352 goto err_reqs; 1353 1354 /* control vq MAC address set command */ 1355 r = vioif_dmamap_create_load(sc, 1356 &ctrlq->ctrlq_mac_addr_dmamap, 1357 ctrlq->ctrlq_mac_addr, 1358 sizeof(*ctrlq->ctrlq_mac_addr), 1, 1359 BUS_DMA_WRITE, "mac addr set command"); 1360 if (r != 0) 1361 goto err_reqs; 1362 } 1363 1364 return 0; 1365 1366 err_reqs: 1367 vioif_dmamap_destroy(sc, &ctrlq->ctrlq_tbl_mc_dmamap); 1368 vioif_dmamap_destroy(sc, &ctrlq->ctrlq_tbl_uc_dmamap); 1369 vioif_dmamap_destroy(sc, &ctrlq->ctrlq_rx_dmamap); 1370 vioif_dmamap_destroy(sc, &ctrlq->ctrlq_status_dmamap); 1371 vioif_dmamap_destroy(sc, &ctrlq->ctrlq_cmd_dmamap); 1372 vioif_dmamap_destroy(sc, &ctrlq->ctrlq_mac_addr_dmamap); 1373 for (qid = 0; qid < netq_num; qid++) { 1374 vq_num = sc->sc_netqs[qid].netq_vq->vq_num; 1375 maps = sc->sc_netqs[qid].netq_maps; 1376 1377 for (i = 0; i < vq_num; i++) { 1378 vioif_dmamap_destroy(sc, &maps[i].vnm_mbuf_map); 1379 vioif_dmamap_destroy(sc, &maps[i].vnm_hdr_map); 1380 } 1381 } 1382 if (sc->sc_kmem) { 1383 kmem_free(sc->sc_kmem, kmemsize); 1384 sc->sc_kmem = NULL; 1385 } 1386 bus_dmamem_unmap(virtio_dmat(vsc), sc->sc_dmamem, dmamemsize); 1387 err_dmamem_alloc: 1388 bus_dmamem_free(virtio_dmat(vsc), &sc->sc_segs[0], 1); 1389 err_none: 1390 return -1; 1391 } 1392 1393 static void 1394 vioif_alloc_queues(struct vioif_softc *sc) 1395 { 1396 int nvq_pairs = sc->sc_max_nvq_pairs; 1397 size_t nvqs, netq_num; 1398 1399 KASSERT(nvq_pairs <= VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX); 1400 1401 nvqs = netq_num = sc->sc_max_nvq_pairs * 2; 1402 if (sc->sc_has_ctrl) 1403 nvqs++; 1404 1405 sc->sc_vqs = kmem_zalloc(sizeof(sc->sc_vqs[0]) * nvqs, KM_SLEEP); 1406 sc->sc_netqs = kmem_zalloc(sizeof(sc->sc_netqs[0]) * netq_num, 1407 KM_SLEEP); 1408 } 1409 1410 static void 1411 vioif_free_queues(struct vioif_softc *sc) 1412 { 1413 size_t nvqs, netq_num; 1414 1415 nvqs = netq_num = sc->sc_max_nvq_pairs * 2; 1416 if (sc->sc_ctrlq.ctrlq_vq) 1417 nvqs++; 1418 1419 kmem_free(sc->sc_netqs, sizeof(sc->sc_netqs[0]) * netq_num); 1420 kmem_free(sc->sc_vqs, sizeof(sc->sc_vqs[0]) * nvqs); 1421 sc->sc_netqs = NULL; 1422 sc->sc_vqs = NULL; 1423 } 1424 1425 /* 1426 * Network queues 1427 */ 1428 static int 1429 vioif_netqueue_init(struct vioif_softc *sc, struct virtio_softc *vsc, 1430 size_t qid, u_int softint_flags) 1431 { 1432 static const struct { 1433 const char *dirname; 1434 int segsize; 1435 int nsegs; 1436 int (*intrhand)(void *); 1437 void (*sihand)(void *); 1438 } params[VIOIF_NETQ_IDX] = { 1439 [VIOIF_NETQ_RX] = { 1440 .dirname = "rx", 1441 .segsize = MCLBYTES, 1442 .nsegs = 2, 1443 .intrhand = vioif_rx_intr, 1444 .sihand = vioif_rx_handle, 1445 }, 1446 [VIOIF_NETQ_TX] = { 1447 .dirname = "tx", 1448 .segsize = ETHER_MAX_LEN - ETHER_HDR_LEN, 1449 .nsegs = 2, 1450 .intrhand = vioif_tx_intr, 1451 .sihand = vioif_tx_handle, 1452 } 1453 }; 1454 1455 struct virtqueue *vq; 1456 struct vioif_netqueue *netq; 1457 struct vioif_tx_context *txc; 1458 struct vioif_rx_context *rxc; 1459 char qname[32]; 1460 int r, dir; 1461 1462 txc = NULL; 1463 rxc = NULL; 1464 netq = &sc->sc_netqs[qid]; 1465 vq = &sc->sc_vqs[qid]; 1466 dir = VIOIF_NETQ_DIR(qid); 1467 1468 netq->netq_vq = &sc->sc_vqs[qid]; 1469 netq->netq_stopping = false; 1470 netq->netq_running_handle = false; 1471 1472 snprintf(qname, sizeof(qname), "%s%zu", 1473 params[dir].dirname, VIOIF_NETQ_PAIRIDX(qid)); 1474 snprintf(netq->netq_evgroup, sizeof(netq->netq_evgroup), 1475 "%s-%s", device_xname(sc->sc_dev), qname); 1476 1477 mutex_init(&netq->netq_lock, MUTEX_DEFAULT, IPL_NET); 1478 virtio_init_vq(vsc, vq, qid, params[dir].intrhand, netq); 1479 1480 r = virtio_alloc_vq(vsc, vq, 1481 params[dir].segsize + sc->sc_hdr_size, 1482 params[dir].nsegs, qname); 1483 if (r != 0) 1484 goto err; 1485 netq->netq_vq = vq; 1486 1487 netq->netq_softint = softint_establish(softint_flags, 1488 params[dir].sihand, netq); 1489 if (netq->netq_softint == NULL) { 1490 aprint_error_dev(sc->sc_dev, 1491 "couldn't establish %s softint\n", 1492 params[dir].dirname); 1493 goto err; 1494 } 1495 vioif_work_set(&netq->netq_work, params[dir].sihand, netq); 1496 1497 switch (dir) { 1498 case VIOIF_NETQ_RX: 1499 rxc = kmem_zalloc(sizeof(*rxc), KM_SLEEP); 1500 netq->netq_ctx = rxc; 1501 /* nothing to do */ 1502 break; 1503 case VIOIF_NETQ_TX: 1504 txc = kmem_zalloc(sizeof(*txc), KM_SLEEP); 1505 netq->netq_ctx = (void *)txc; 1506 txc->txc_deferred_transmit = softint_establish(softint_flags, 1507 vioif_deferred_transmit, netq); 1508 if (txc->txc_deferred_transmit == NULL) { 1509 aprint_error_dev(sc->sc_dev, 1510 "couldn't establish softint for " 1511 "tx deferred transmit\n"); 1512 goto err; 1513 } 1514 txc->txc_link_active = VIOIF_IS_LINK_ACTIVE(sc); 1515 txc->txc_no_free_slots = false; 1516 txc->txc_intrq = pcq_create(vq->vq_num, KM_SLEEP); 1517 break; 1518 } 1519 1520 return 0; 1521 1522 err: 1523 netq->netq_ctx = NULL; 1524 1525 if (rxc != NULL) { 1526 kmem_free(rxc, sizeof(*rxc)); 1527 } 1528 1529 if (txc != NULL) { 1530 if (txc->txc_deferred_transmit != NULL) 1531 softint_disestablish(txc->txc_deferred_transmit); 1532 if (txc->txc_intrq != NULL) 1533 pcq_destroy(txc->txc_intrq); 1534 kmem_free(txc, sizeof(txc)); 1535 } 1536 1537 vioif_work_set(&netq->netq_work, NULL, NULL); 1538 if (netq->netq_softint != NULL) { 1539 softint_disestablish(netq->netq_softint); 1540 netq->netq_softint = NULL; 1541 } 1542 1543 virtio_free_vq(vsc, vq); 1544 mutex_destroy(&netq->netq_lock); 1545 netq->netq_vq = NULL; 1546 1547 return -1; 1548 } 1549 1550 static void 1551 vioif_netqueue_teardown(struct vioif_softc *sc, struct virtio_softc *vsc, 1552 size_t qid) 1553 { 1554 struct vioif_netqueue *netq; 1555 struct vioif_rx_context *rxc; 1556 struct vioif_tx_context *txc; 1557 int dir; 1558 1559 netq = &sc->sc_netqs[qid]; 1560 1561 if (netq->netq_vq == NULL) 1562 return; 1563 1564 netq = &sc->sc_netqs[qid]; 1565 dir = VIOIF_NETQ_DIR(qid); 1566 switch (dir) { 1567 case VIOIF_NETQ_RX: 1568 rxc = netq->netq_ctx; 1569 netq->netq_ctx = NULL; 1570 kmem_free(rxc, sizeof(*rxc)); 1571 break; 1572 case VIOIF_NETQ_TX: 1573 txc = netq->netq_ctx; 1574 netq->netq_ctx = NULL; 1575 softint_disestablish(txc->txc_deferred_transmit); 1576 pcq_destroy(txc->txc_intrq); 1577 kmem_free(txc, sizeof(*txc)); 1578 break; 1579 } 1580 1581 softint_disestablish(netq->netq_softint); 1582 virtio_free_vq(vsc, netq->netq_vq); 1583 mutex_destroy(&netq->netq_lock); 1584 netq->netq_vq = NULL; 1585 } 1586 1587 static void 1588 vioif_net_sched_handle(struct vioif_softc *sc, struct vioif_netqueue *netq) 1589 { 1590 1591 KASSERT(mutex_owned(&netq->netq_lock)); 1592 KASSERT(!netq->netq_stopping); 1593 1594 if (netq->netq_workqueue) { 1595 vioif_work_add(sc->sc_txrx_workqueue, &netq->netq_work); 1596 } else { 1597 softint_schedule(netq->netq_softint); 1598 } 1599 } 1600 1601 static int 1602 vioif_net_load_mbuf(struct virtio_softc *vsc, struct vioif_net_map *map, 1603 struct mbuf *m, int dma_flags) 1604 { 1605 int r; 1606 1607 KASSERT(map->vnm_mbuf == NULL); 1608 1609 r = bus_dmamap_load_mbuf(virtio_dmat(vsc), 1610 map->vnm_mbuf_map, m, dma_flags | BUS_DMA_NOWAIT); 1611 if (r == 0) { 1612 map->vnm_mbuf = m; 1613 } 1614 1615 return r; 1616 } 1617 1618 static void 1619 vioif_net_unload_mbuf(struct virtio_softc *vsc, struct vioif_net_map *map) 1620 { 1621 1622 KASSERT(map->vnm_mbuf != NULL); 1623 bus_dmamap_unload(virtio_dmat(vsc), map->vnm_mbuf_map); 1624 map->vnm_mbuf = NULL; 1625 } 1626 1627 static int 1628 vioif_net_enqueue(struct virtio_softc *vsc, struct virtqueue *vq, 1629 int slot, struct vioif_net_map *map, int dma_ops, bool is_write) 1630 { 1631 int r; 1632 1633 KASSERT(map->vnm_mbuf != NULL); 1634 1635 /* This should actually never fail */ 1636 r = virtio_enqueue_reserve(vsc, vq, slot, 1637 map->vnm_mbuf_map->dm_nsegs + 1); 1638 if (r != 0) { 1639 /* slot already freed by virtio_enqueue_reserve */ 1640 return r; 1641 } 1642 1643 bus_dmamap_sync(virtio_dmat(vsc), map->vnm_mbuf_map, 1644 0, map->vnm_mbuf_map->dm_mapsize, dma_ops); 1645 bus_dmamap_sync(virtio_dmat(vsc), map->vnm_hdr_map, 1646 0, map->vnm_hdr_map->dm_mapsize, dma_ops); 1647 1648 virtio_enqueue(vsc, vq, slot, map->vnm_hdr_map, is_write); 1649 virtio_enqueue(vsc, vq, slot, map->vnm_mbuf_map, is_write); 1650 virtio_enqueue_commit(vsc, vq, slot, false); 1651 1652 return 0; 1653 } 1654 1655 static int 1656 vioif_net_enqueue_tx(struct virtio_softc *vsc, struct virtqueue *vq, 1657 int slot, struct vioif_net_map *map) 1658 { 1659 1660 return vioif_net_enqueue(vsc, vq, slot, map, 1661 BUS_DMASYNC_PREWRITE, true); 1662 } 1663 1664 static int 1665 vioif_net_enqueue_rx(struct virtio_softc *vsc, struct virtqueue *vq, 1666 int slot, struct vioif_net_map *map) 1667 { 1668 1669 return vioif_net_enqueue(vsc, vq, slot, map, 1670 BUS_DMASYNC_PREREAD, false); 1671 } 1672 1673 static struct mbuf * 1674 vioif_net_dequeue_commit(struct virtio_softc *vsc, struct virtqueue *vq, 1675 int slot, struct vioif_net_map *map, int dma_flags) 1676 { 1677 struct mbuf *m; 1678 1679 m = map->vnm_mbuf; 1680 KASSERT(m != NULL); 1681 map->vnm_mbuf = NULL; 1682 1683 bus_dmamap_sync(virtio_dmat(vsc), map->vnm_hdr_map, 1684 0, map->vnm_hdr_map->dm_mapsize, dma_flags); 1685 bus_dmamap_sync(virtio_dmat(vsc), map->vnm_mbuf_map, 1686 0, map->vnm_mbuf_map->dm_mapsize, dma_flags); 1687 1688 bus_dmamap_unload(virtio_dmat(vsc), map->vnm_mbuf_map); 1689 virtio_dequeue_commit(vsc, vq, slot); 1690 1691 return m; 1692 } 1693 1694 static void 1695 vioif_net_intr_enable(struct vioif_softc *sc, struct virtio_softc *vsc) 1696 { 1697 struct vioif_netqueue *netq; 1698 size_t i, act_qnum; 1699 int enqueued; 1700 1701 act_qnum = sc->sc_act_nvq_pairs * 2; 1702 for (i = 0; i < act_qnum; i++) { 1703 netq = &sc->sc_netqs[i]; 1704 1705 KASSERT(!netq->netq_stopping); 1706 KASSERT(!netq->netq_running_handle); 1707 1708 enqueued = virtio_start_vq_intr(vsc, netq->netq_vq); 1709 if (enqueued != 0) { 1710 virtio_stop_vq_intr(vsc, netq->netq_vq); 1711 1712 mutex_enter(&netq->netq_lock); 1713 netq->netq_running_handle = true; 1714 vioif_net_sched_handle(sc, netq); 1715 mutex_exit(&netq->netq_lock); 1716 } 1717 } 1718 } 1719 1720 static void 1721 vioif_net_intr_disable(struct vioif_softc *sc, struct virtio_softc *vsc) 1722 { 1723 struct vioif_netqueue *netq; 1724 size_t i, act_qnum; 1725 1726 act_qnum = sc->sc_act_nvq_pairs * 2; 1727 for (i = 0; i < act_qnum; i++) { 1728 netq = &sc->sc_netqs[i]; 1729 1730 virtio_stop_vq_intr(vsc, netq->netq_vq); 1731 } 1732 } 1733 1734 /* 1735 * Receive implementation 1736 */ 1737 /* enqueue mbufs to receive slots */ 1738 static void 1739 vioif_populate_rx_mbufs_locked(struct vioif_softc *sc, struct vioif_netqueue *netq) 1740 { 1741 struct virtqueue *vq = netq->netq_vq; 1742 struct virtio_softc *vsc = vq->vq_owner; 1743 struct vioif_rx_context *rxc; 1744 struct vioif_net_map *map; 1745 struct mbuf *m; 1746 int i, r, ndone = 0; 1747 1748 KASSERT(mutex_owned(&netq->netq_lock)); 1749 1750 rxc = netq->netq_ctx; 1751 1752 for (i = 0; i < vq->vq_num; i++) { 1753 int slot; 1754 r = virtio_enqueue_prep(vsc, vq, &slot); 1755 if (r == EAGAIN) 1756 break; 1757 if (__predict_false(r != 0)) 1758 panic("enqueue_prep for rx buffers"); 1759 1760 MGETHDR(m, M_DONTWAIT, MT_DATA); 1761 if (m == NULL) { 1762 virtio_enqueue_abort(vsc, vq, slot); 1763 rxc->rxc_mbuf_enobufs.ev_count++; 1764 break; 1765 } 1766 MCLGET(m, M_DONTWAIT); 1767 if ((m->m_flags & M_EXT) == 0) { 1768 virtio_enqueue_abort(vsc, vq, slot); 1769 m_freem(m); 1770 rxc->rxc_mbuf_enobufs.ev_count++; 1771 break; 1772 } 1773 1774 m->m_len = m->m_pkthdr.len = MCLBYTES; 1775 m_adj(m, ETHER_ALIGN); 1776 1777 map = &netq->netq_maps[slot]; 1778 r = vioif_net_load_mbuf(vsc, map, m, BUS_DMA_READ); 1779 if (r != 0) { 1780 virtio_enqueue_abort(vsc, vq, slot); 1781 m_freem(m); 1782 netq->netq_mbuf_load_failed.ev_count++; 1783 break; 1784 } 1785 1786 r = vioif_net_enqueue_rx(vsc, vq, slot, map); 1787 if (r != 0) { 1788 vioif_net_unload_mbuf(vsc, map); 1789 netq->netq_enqueue_failed.ev_count++; 1790 m_freem(m); 1791 /* slot already freed by vioif_net_enqueue_rx */ 1792 break; 1793 } 1794 1795 ndone++; 1796 } 1797 1798 if (ndone > 0) 1799 vioif_notify(vsc, vq); 1800 } 1801 1802 /* dequeue received packets */ 1803 static bool 1804 vioif_rx_deq_locked(struct vioif_softc *sc, struct virtio_softc *vsc, 1805 struct vioif_netqueue *netq, u_int limit, size_t *ndeqp) 1806 { 1807 struct virtqueue *vq = netq->netq_vq; 1808 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 1809 struct vioif_net_map *map; 1810 struct mbuf *m; 1811 int slot, len; 1812 bool more; 1813 size_t ndeq; 1814 1815 KASSERT(mutex_owned(&netq->netq_lock)); 1816 1817 more = false; 1818 ndeq = 0; 1819 1820 if (virtio_vq_is_enqueued(vsc, vq) == false) 1821 goto done; 1822 1823 for (;;ndeq++) { 1824 if (ndeq >= limit) { 1825 more = true; 1826 break; 1827 } 1828 1829 if (virtio_dequeue(vsc, vq, &slot, &len) != 0) 1830 break; 1831 1832 map = &netq->netq_maps[slot]; 1833 KASSERT(map->vnm_mbuf != NULL); 1834 m = vioif_net_dequeue_commit(vsc, vq, slot, 1835 map, BUS_DMASYNC_POSTREAD); 1836 KASSERT(m != NULL); 1837 1838 m->m_len = m->m_pkthdr.len = len - sc->sc_hdr_size; 1839 m_set_rcvif(m, ifp); 1840 if_percpuq_enqueue(ifp->if_percpuq, m); 1841 } 1842 1843 done: 1844 if (ndeqp != NULL) 1845 *ndeqp = ndeq; 1846 1847 return more; 1848 } 1849 1850 static void 1851 vioif_rx_queue_clear(struct vioif_softc *sc, struct virtio_softc *vsc, 1852 struct vioif_netqueue *netq) 1853 { 1854 struct vioif_net_map *map; 1855 struct mbuf *m; 1856 unsigned int i, vq_num; 1857 bool more; 1858 1859 mutex_enter(&netq->netq_lock); 1860 1861 vq_num = netq->netq_vq->vq_num; 1862 for (;;) { 1863 more = vioif_rx_deq_locked(sc, vsc, netq, vq_num, NULL); 1864 if (more == false) 1865 break; 1866 } 1867 1868 for (i = 0; i < vq_num; i++) { 1869 map = &netq->netq_maps[i]; 1870 1871 m = map->vnm_mbuf; 1872 if (m == NULL) 1873 continue; 1874 1875 vioif_net_unload_mbuf(vsc, map); 1876 m_freem(m); 1877 } 1878 mutex_exit(&netq->netq_lock); 1879 } 1880 1881 static void 1882 vioif_rx_handle_locked(void *xnetq, u_int limit) 1883 { 1884 struct vioif_netqueue *netq = xnetq; 1885 struct virtqueue *vq = netq->netq_vq; 1886 struct virtio_softc *vsc = vq->vq_owner; 1887 struct vioif_softc *sc = device_private(virtio_child(vsc)); 1888 bool more; 1889 int enqueued; 1890 size_t ndeq; 1891 1892 KASSERT(mutex_owned(&netq->netq_lock)); 1893 KASSERT(!netq->netq_stopping); 1894 1895 more = vioif_rx_deq_locked(sc, vsc, netq, limit, &ndeq); 1896 if (ndeq > 0) 1897 vioif_populate_rx_mbufs_locked(sc, netq); 1898 1899 if (more) { 1900 vioif_net_sched_handle(sc, netq); 1901 return; 1902 } 1903 1904 enqueued = virtio_start_vq_intr(vsc, netq->netq_vq); 1905 if (enqueued != 0) { 1906 virtio_stop_vq_intr(vsc, netq->netq_vq); 1907 vioif_net_sched_handle(sc, netq); 1908 return; 1909 } 1910 1911 netq->netq_running_handle = false; 1912 } 1913 1914 static int 1915 vioif_rx_intr(void *arg) 1916 { 1917 struct vioif_netqueue *netq = arg; 1918 struct virtqueue *vq = netq->netq_vq; 1919 struct virtio_softc *vsc = vq->vq_owner; 1920 struct vioif_softc *sc = device_private(virtio_child(vsc)); 1921 u_int limit; 1922 1923 mutex_enter(&netq->netq_lock); 1924 1925 /* handler is already running in softint/workqueue */ 1926 if (netq->netq_running_handle) 1927 goto done; 1928 1929 if (netq->netq_stopping) 1930 goto done; 1931 1932 netq->netq_running_handle = true; 1933 1934 limit = sc->sc_rx_intr_process_limit; 1935 virtio_stop_vq_intr(vsc, vq); 1936 vioif_rx_handle_locked(netq, limit); 1937 1938 done: 1939 mutex_exit(&netq->netq_lock); 1940 return 1; 1941 } 1942 1943 static void 1944 vioif_rx_handle(void *xnetq) 1945 { 1946 struct vioif_netqueue *netq = xnetq; 1947 struct virtqueue *vq = netq->netq_vq; 1948 struct virtio_softc *vsc = vq->vq_owner; 1949 struct vioif_softc *sc = device_private(virtio_child(vsc)); 1950 u_int limit; 1951 1952 mutex_enter(&netq->netq_lock); 1953 1954 KASSERT(netq->netq_running_handle); 1955 1956 if (netq->netq_stopping) { 1957 netq->netq_running_handle = false; 1958 goto done; 1959 } 1960 1961 limit = sc->sc_rx_process_limit; 1962 vioif_rx_handle_locked(netq, limit); 1963 1964 done: 1965 mutex_exit(&netq->netq_lock); 1966 } 1967 1968 /* 1969 * Transmission implementation 1970 */ 1971 /* enqueue mbufs to send */ 1972 static void 1973 vioif_send_common_locked(struct ifnet *ifp, struct vioif_netqueue *netq, 1974 bool is_transmit) 1975 { 1976 struct vioif_softc *sc = ifp->if_softc; 1977 struct virtio_softc *vsc = sc->sc_virtio; 1978 struct virtqueue *vq = netq->netq_vq; 1979 struct vioif_tx_context *txc; 1980 struct vioif_net_map *map; 1981 struct mbuf *m; 1982 int queued = 0; 1983 1984 KASSERT(mutex_owned(&netq->netq_lock)); 1985 1986 if (netq->netq_stopping || 1987 !ISSET(ifp->if_flags, IFF_RUNNING)) 1988 return; 1989 1990 txc = netq->netq_ctx; 1991 1992 if (!txc->txc_link_active || 1993 txc->txc_no_free_slots) 1994 return; 1995 1996 for (;;) { 1997 int slot, r; 1998 r = virtio_enqueue_prep(vsc, vq, &slot); 1999 if (r == EAGAIN) { 2000 txc->txc_no_free_slots = true; 2001 break; 2002 } 2003 if (__predict_false(r != 0)) 2004 panic("enqueue_prep for tx buffers"); 2005 2006 if (is_transmit) 2007 m = pcq_get(txc->txc_intrq); 2008 else 2009 IFQ_DEQUEUE(&ifp->if_snd, m); 2010 2011 if (m == NULL) { 2012 virtio_enqueue_abort(vsc, vq, slot); 2013 break; 2014 } 2015 2016 map = &netq->netq_maps[slot]; 2017 KASSERT(map->vnm_mbuf == NULL); 2018 2019 r = vioif_net_load_mbuf(vsc, map, m, BUS_DMA_WRITE); 2020 if (r != 0) { 2021 /* maybe just too fragmented */ 2022 struct mbuf *newm; 2023 2024 newm = m_defrag(m, M_NOWAIT); 2025 if (newm != NULL) { 2026 m = newm; 2027 r = vioif_net_load_mbuf(vsc, map, m, 2028 BUS_DMA_WRITE); 2029 } else { 2030 txc->txc_defrag_failed.ev_count++; 2031 r = -1; 2032 } 2033 2034 if (r != 0) { 2035 netq->netq_mbuf_load_failed.ev_count++; 2036 m_freem(m); 2037 if_statinc(ifp, if_oerrors); 2038 virtio_enqueue_abort(vsc, vq, slot); 2039 continue; 2040 } 2041 } 2042 2043 memset(map->vnm_hdr, 0, sc->sc_hdr_size); 2044 2045 r = vioif_net_enqueue_tx(vsc, vq, slot, map); 2046 if (r != 0) { 2047 netq->netq_enqueue_failed.ev_count++; 2048 vioif_net_unload_mbuf(vsc, map); 2049 m_freem(m); 2050 /* slot already freed by vioif_net_enqueue_tx */ 2051 2052 if_statinc(ifp, if_oerrors); 2053 continue; 2054 } 2055 2056 queued++; 2057 bpf_mtap(ifp, m, BPF_D_OUT); 2058 } 2059 2060 if (queued > 0) { 2061 vioif_notify(vsc, vq); 2062 ifp->if_timer = 5; 2063 } 2064 } 2065 2066 /* dequeue sent mbufs */ 2067 static bool 2068 vioif_tx_deq_locked(struct vioif_softc *sc, struct virtio_softc *vsc, 2069 struct vioif_netqueue *netq, u_int limit, size_t *ndeqp) 2070 { 2071 struct virtqueue *vq = netq->netq_vq; 2072 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 2073 struct vioif_net_map *map; 2074 struct mbuf *m; 2075 int slot, len; 2076 bool more; 2077 size_t ndeq; 2078 2079 KASSERT(mutex_owned(&netq->netq_lock)); 2080 2081 more = false; 2082 ndeq = 0; 2083 2084 if (virtio_vq_is_enqueued(vsc, vq) == false) 2085 goto done; 2086 2087 for (;;ndeq++) { 2088 if (limit-- == 0) { 2089 more = true; 2090 break; 2091 } 2092 2093 if (virtio_dequeue(vsc, vq, &slot, &len) != 0) 2094 break; 2095 2096 map = &netq->netq_maps[slot]; 2097 KASSERT(map->vnm_mbuf != NULL); 2098 m = vioif_net_dequeue_commit(vsc, vq, slot, 2099 map, BUS_DMASYNC_POSTWRITE); 2100 KASSERT(m != NULL); 2101 2102 if_statinc(ifp, if_opackets); 2103 m_freem(m); 2104 } 2105 2106 done: 2107 if (ndeqp != NULL) 2108 *ndeqp = ndeq; 2109 return more; 2110 } 2111 2112 static void 2113 vioif_tx_queue_clear(struct vioif_softc *sc, struct virtio_softc *vsc, 2114 struct vioif_netqueue *netq) 2115 { 2116 struct vioif_tx_context *txc; 2117 struct vioif_net_map *map; 2118 struct mbuf *m; 2119 unsigned int i, vq_num; 2120 bool more; 2121 2122 mutex_enter(&netq->netq_lock); 2123 2124 txc = netq->netq_ctx; 2125 vq_num = netq->netq_vq->vq_num; 2126 2127 for (;;) { 2128 more = vioif_tx_deq_locked(sc, vsc, netq, vq_num, NULL); 2129 if (more == false) 2130 break; 2131 } 2132 2133 for (i = 0; i < vq_num; i++) { 2134 map = &netq->netq_maps[i]; 2135 2136 m = map->vnm_mbuf; 2137 if (m == NULL) 2138 continue; 2139 2140 vioif_net_unload_mbuf(vsc, map); 2141 m_freem(m); 2142 } 2143 2144 txc->txc_no_free_slots = false; 2145 2146 mutex_exit(&netq->netq_lock); 2147 } 2148 2149 static void 2150 vioif_start_locked(struct ifnet *ifp, struct vioif_netqueue *netq) 2151 { 2152 2153 /* 2154 * ifp->if_obytes and ifp->if_omcasts are added in if_transmit()@if.c. 2155 */ 2156 vioif_send_common_locked(ifp, netq, false); 2157 2158 } 2159 2160 static void 2161 vioif_transmit_locked(struct ifnet *ifp, struct vioif_netqueue *netq) 2162 { 2163 2164 vioif_send_common_locked(ifp, netq, true); 2165 } 2166 2167 static void 2168 vioif_deferred_transmit(void *arg) 2169 { 2170 struct vioif_netqueue *netq = arg; 2171 struct virtio_softc *vsc = netq->netq_vq->vq_owner; 2172 struct vioif_softc *sc = device_private(virtio_child(vsc)); 2173 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 2174 2175 mutex_enter(&netq->netq_lock); 2176 vioif_send_common_locked(ifp, netq, true); 2177 mutex_exit(&netq->netq_lock); 2178 } 2179 2180 static void 2181 vioif_tx_handle_locked(struct vioif_netqueue *netq, u_int limit) 2182 { 2183 struct virtqueue *vq = netq->netq_vq; 2184 struct vioif_tx_context *txc = netq->netq_ctx; 2185 struct virtio_softc *vsc = vq->vq_owner; 2186 struct vioif_softc *sc = device_private(virtio_child(vsc)); 2187 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 2188 bool more; 2189 int enqueued; 2190 size_t ndeq; 2191 2192 KASSERT(mutex_owned(&netq->netq_lock)); 2193 KASSERT(!netq->netq_stopping); 2194 2195 more = vioif_tx_deq_locked(sc, vsc, netq, limit, &ndeq); 2196 if (txc->txc_no_free_slots && ndeq > 0) { 2197 txc->txc_no_free_slots = false; 2198 softint_schedule(txc->txc_deferred_transmit); 2199 } 2200 2201 if (more) { 2202 vioif_net_sched_handle(sc, netq); 2203 return; 2204 } 2205 2206 enqueued = (virtio_features(vsc) & VIRTIO_F_RING_EVENT_IDX) ? 2207 virtio_postpone_intr_smart(vsc, vq): 2208 virtio_start_vq_intr(vsc, vq); 2209 if (enqueued != 0) { 2210 virtio_stop_vq_intr(vsc, vq); 2211 vioif_net_sched_handle(sc, netq); 2212 return; 2213 } 2214 2215 netq->netq_running_handle = false; 2216 2217 /* for ALTQ */ 2218 if (netq == &sc->sc_netqs[VIOIF_NETQ_TXQID(0)]) 2219 if_schedule_deferred_start(ifp); 2220 2221 softint_schedule(txc->txc_deferred_transmit); 2222 } 2223 2224 static int 2225 vioif_tx_intr(void *arg) 2226 { 2227 struct vioif_netqueue *netq = arg; 2228 struct virtqueue *vq = netq->netq_vq; 2229 struct virtio_softc *vsc = vq->vq_owner; 2230 struct vioif_softc *sc = device_private(virtio_child(vsc)); 2231 u_int limit; 2232 2233 mutex_enter(&netq->netq_lock); 2234 2235 /* tx handler is already running in softint/workqueue */ 2236 if (netq->netq_running_handle) 2237 goto done; 2238 2239 if (netq->netq_stopping) 2240 goto done; 2241 2242 netq->netq_running_handle = true; 2243 2244 virtio_stop_vq_intr(vsc, vq); 2245 netq->netq_workqueue = sc->sc_txrx_workqueue_sysctl; 2246 limit = sc->sc_tx_intr_process_limit; 2247 vioif_tx_handle_locked(netq, limit); 2248 2249 done: 2250 mutex_exit(&netq->netq_lock); 2251 return 1; 2252 } 2253 2254 static void 2255 vioif_tx_handle(void *xnetq) 2256 { 2257 struct vioif_netqueue *netq = xnetq; 2258 struct virtqueue *vq = netq->netq_vq; 2259 struct virtio_softc *vsc = vq->vq_owner; 2260 struct vioif_softc *sc = device_private(virtio_child(vsc)); 2261 u_int limit; 2262 2263 mutex_enter(&netq->netq_lock); 2264 2265 KASSERT(netq->netq_running_handle); 2266 2267 if (netq->netq_stopping) { 2268 netq->netq_running_handle = false; 2269 goto done; 2270 } 2271 2272 limit = sc->sc_tx_process_limit; 2273 vioif_tx_handle_locked(netq, limit); 2274 2275 done: 2276 mutex_exit(&netq->netq_lock); 2277 } 2278 2279 /* 2280 * Control vq 2281 */ 2282 /* issue a VIRTIO_NET_CTRL_RX class command and wait for completion */ 2283 static void 2284 vioif_ctrl_acquire(struct vioif_softc *sc) 2285 { 2286 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 2287 2288 mutex_enter(&ctrlq->ctrlq_wait_lock); 2289 while (ctrlq->ctrlq_inuse != FREE) 2290 cv_wait(&ctrlq->ctrlq_wait, &ctrlq->ctrlq_wait_lock); 2291 ctrlq->ctrlq_inuse = INUSE; 2292 ctrlq->ctrlq_owner = curlwp; 2293 mutex_exit(&ctrlq->ctrlq_wait_lock); 2294 } 2295 2296 static void 2297 vioif_ctrl_release(struct vioif_softc *sc) 2298 { 2299 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 2300 2301 KASSERT(ctrlq->ctrlq_inuse != FREE); 2302 KASSERT(ctrlq->ctrlq_owner == curlwp); 2303 2304 mutex_enter(&ctrlq->ctrlq_wait_lock); 2305 ctrlq->ctrlq_inuse = FREE; 2306 ctrlq->ctrlq_owner = NULL; 2307 cv_signal(&ctrlq->ctrlq_wait); 2308 mutex_exit(&ctrlq->ctrlq_wait_lock); 2309 } 2310 2311 static int 2312 vioif_ctrl_load_cmdspec(struct vioif_softc *sc, 2313 struct vioif_ctrl_cmdspec *specs, int nspecs) 2314 { 2315 struct virtio_softc *vsc = sc->sc_virtio; 2316 int i, r, loaded; 2317 2318 loaded = 0; 2319 for (i = 0; i < nspecs; i++) { 2320 r = bus_dmamap_load(virtio_dmat(vsc), 2321 specs[i].dmamap, specs[i].buf, specs[i].bufsize, 2322 NULL, BUS_DMA_WRITE | BUS_DMA_NOWAIT); 2323 if (r) { 2324 sc->sc_ctrlq.ctrlq_cmd_load_failed.ev_count++; 2325 goto err; 2326 } 2327 loaded++; 2328 2329 } 2330 2331 return r; 2332 2333 err: 2334 for (i = 0; i < loaded; i++) { 2335 bus_dmamap_unload(virtio_dmat(vsc), specs[i].dmamap); 2336 } 2337 2338 return r; 2339 } 2340 2341 static void 2342 vioif_ctrl_unload_cmdspec(struct vioif_softc *sc, 2343 struct vioif_ctrl_cmdspec *specs, int nspecs) 2344 { 2345 struct virtio_softc *vsc = sc->sc_virtio; 2346 int i; 2347 2348 for (i = 0; i < nspecs; i++) { 2349 bus_dmamap_unload(virtio_dmat(vsc), specs[i].dmamap); 2350 } 2351 } 2352 2353 static int 2354 vioif_ctrl_send_command(struct vioif_softc *sc, uint8_t class, uint8_t cmd, 2355 struct vioif_ctrl_cmdspec *specs, int nspecs) 2356 { 2357 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 2358 struct virtqueue *vq = ctrlq->ctrlq_vq; 2359 struct virtio_softc *vsc = sc->sc_virtio; 2360 int i, r, slot; 2361 2362 ctrlq->ctrlq_cmd->class = class; 2363 ctrlq->ctrlq_cmd->command = cmd; 2364 2365 bus_dmamap_sync(virtio_dmat(vsc), ctrlq->ctrlq_cmd_dmamap, 2366 0, sizeof(struct virtio_net_ctrl_cmd), BUS_DMASYNC_PREWRITE); 2367 for (i = 0; i < nspecs; i++) { 2368 bus_dmamap_sync(virtio_dmat(vsc), specs[i].dmamap, 2369 0, specs[i].bufsize, BUS_DMASYNC_PREWRITE); 2370 } 2371 bus_dmamap_sync(virtio_dmat(vsc), ctrlq->ctrlq_status_dmamap, 2372 0, sizeof(struct virtio_net_ctrl_status), BUS_DMASYNC_PREREAD); 2373 2374 /* we need to explicitly (re)start vq intr when using RING EVENT IDX */ 2375 if (virtio_features(vsc) & VIRTIO_F_RING_EVENT_IDX) 2376 virtio_start_vq_intr(vsc, ctrlq->ctrlq_vq); 2377 2378 r = virtio_enqueue_prep(vsc, vq, &slot); 2379 if (r != 0) 2380 panic("%s: control vq busy!?", device_xname(sc->sc_dev)); 2381 r = virtio_enqueue_reserve(vsc, vq, slot, nspecs + 2); 2382 if (r != 0) 2383 panic("%s: control vq busy!?", device_xname(sc->sc_dev)); 2384 virtio_enqueue(vsc, vq, slot, ctrlq->ctrlq_cmd_dmamap, true); 2385 for (i = 0; i < nspecs; i++) { 2386 virtio_enqueue(vsc, vq, slot, specs[i].dmamap, true); 2387 } 2388 virtio_enqueue(vsc, vq, slot, ctrlq->ctrlq_status_dmamap, false); 2389 virtio_enqueue_commit(vsc, vq, slot, true); 2390 2391 /* wait for done */ 2392 mutex_enter(&ctrlq->ctrlq_wait_lock); 2393 while (ctrlq->ctrlq_inuse != DONE) 2394 cv_wait(&ctrlq->ctrlq_wait, &ctrlq->ctrlq_wait_lock); 2395 mutex_exit(&ctrlq->ctrlq_wait_lock); 2396 /* already dequeued */ 2397 2398 bus_dmamap_sync(virtio_dmat(vsc), ctrlq->ctrlq_cmd_dmamap, 0, 2399 sizeof(struct virtio_net_ctrl_cmd), BUS_DMASYNC_POSTWRITE); 2400 for (i = 0; i < nspecs; i++) { 2401 bus_dmamap_sync(virtio_dmat(vsc), specs[i].dmamap, 0, 2402 specs[i].bufsize, BUS_DMASYNC_POSTWRITE); 2403 } 2404 bus_dmamap_sync(virtio_dmat(vsc), ctrlq->ctrlq_status_dmamap, 0, 2405 sizeof(struct virtio_net_ctrl_status), BUS_DMASYNC_POSTREAD); 2406 2407 if (ctrlq->ctrlq_status->ack == VIRTIO_NET_OK) 2408 r = 0; 2409 else { 2410 device_printf(sc->sc_dev, "failed setting rx mode\n"); 2411 sc->sc_ctrlq.ctrlq_cmd_failed.ev_count++; 2412 r = EIO; 2413 } 2414 2415 return r; 2416 } 2417 2418 /* ctrl vq interrupt; wake up the command issuer */ 2419 static int 2420 vioif_ctrl_intr(void *arg) 2421 { 2422 struct vioif_ctrlqueue *ctrlq = arg; 2423 struct virtqueue *vq = ctrlq->ctrlq_vq; 2424 struct virtio_softc *vsc = vq->vq_owner; 2425 int r, slot; 2426 2427 if (virtio_vq_is_enqueued(vsc, vq) == false) 2428 return 0; 2429 2430 r = virtio_dequeue(vsc, vq, &slot, NULL); 2431 if (r == ENOENT) 2432 return 0; 2433 virtio_dequeue_commit(vsc, vq, slot); 2434 2435 mutex_enter(&ctrlq->ctrlq_wait_lock); 2436 ctrlq->ctrlq_inuse = DONE; 2437 cv_signal(&ctrlq->ctrlq_wait); 2438 mutex_exit(&ctrlq->ctrlq_wait_lock); 2439 2440 return 1; 2441 } 2442 2443 static int 2444 vioif_ctrl_rx(struct vioif_softc *sc, int cmd, bool onoff) 2445 { 2446 struct virtio_net_ctrl_rx *rx = sc->sc_ctrlq.ctrlq_rx; 2447 struct vioif_ctrl_cmdspec specs[1]; 2448 int r; 2449 2450 if (!sc->sc_has_ctrl) 2451 return ENOTSUP; 2452 2453 vioif_ctrl_acquire(sc); 2454 2455 rx->onoff = onoff; 2456 specs[0].dmamap = sc->sc_ctrlq.ctrlq_rx_dmamap; 2457 specs[0].buf = rx; 2458 specs[0].bufsize = sizeof(*rx); 2459 2460 r = vioif_ctrl_send_command(sc, VIRTIO_NET_CTRL_RX, cmd, 2461 specs, __arraycount(specs)); 2462 2463 vioif_ctrl_release(sc); 2464 return r; 2465 } 2466 2467 static int 2468 vioif_set_promisc(struct vioif_softc *sc, bool onoff) 2469 { 2470 return vioif_ctrl_rx(sc, VIRTIO_NET_CTRL_RX_PROMISC, onoff); 2471 } 2472 2473 static int 2474 vioif_set_allmulti(struct vioif_softc *sc, bool onoff) 2475 { 2476 return vioif_ctrl_rx(sc, VIRTIO_NET_CTRL_RX_ALLMULTI, onoff); 2477 } 2478 2479 static int 2480 vioif_ctrl_mq_vq_pairs_set(struct vioif_softc *sc, int nvq_pairs) 2481 { 2482 struct virtio_net_ctrl_mq *mq = sc->sc_ctrlq.ctrlq_mq; 2483 struct vioif_ctrl_cmdspec specs[1]; 2484 int r; 2485 2486 if (!sc->sc_has_ctrl) 2487 return ENOTSUP; 2488 2489 if (nvq_pairs <= 1) 2490 return EINVAL; 2491 2492 vioif_ctrl_acquire(sc); 2493 2494 mq->virtqueue_pairs = virtio_rw16(sc->sc_virtio, nvq_pairs); 2495 specs[0].dmamap = sc->sc_ctrlq.ctrlq_mq_dmamap; 2496 specs[0].buf = mq; 2497 specs[0].bufsize = sizeof(*mq); 2498 2499 r = vioif_ctrl_send_command(sc, 2500 VIRTIO_NET_CTRL_MQ, VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, 2501 specs, __arraycount(specs)); 2502 2503 vioif_ctrl_release(sc); 2504 2505 return r; 2506 } 2507 2508 static int 2509 vioif_set_mac_addr(struct vioif_softc *sc) 2510 { 2511 struct virtio_net_ctrl_mac_addr *ma = 2512 sc->sc_ctrlq.ctrlq_mac_addr; 2513 struct vioif_ctrl_cmdspec specs[1]; 2514 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 2515 int nspecs = __arraycount(specs); 2516 uint64_t features; 2517 int r; 2518 size_t i; 2519 2520 if (!sc->sc_has_ctrl) 2521 return ENOTSUP; 2522 2523 if (memcmp(CLLADDR(ifp->if_sadl), sc->sc_mac, 2524 ETHER_ADDR_LEN) == 0) { 2525 return 0; 2526 } 2527 2528 memcpy(sc->sc_mac, CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 2529 2530 features = virtio_features(sc->sc_virtio); 2531 if (features & VIRTIO_NET_F_CTRL_MAC_ADDR) { 2532 vioif_ctrl_acquire(sc); 2533 2534 memcpy(ma->mac, sc->sc_mac, ETHER_ADDR_LEN); 2535 specs[0].dmamap = sc->sc_ctrlq.ctrlq_mac_addr_dmamap; 2536 specs[0].buf = ma; 2537 specs[0].bufsize = sizeof(*ma); 2538 2539 r = vioif_ctrl_send_command(sc, 2540 VIRTIO_NET_CTRL_MAC, VIRTIO_NET_CTRL_MAC_ADDR_SET, 2541 specs, nspecs); 2542 2543 vioif_ctrl_release(sc); 2544 } else { 2545 for (i = 0; i < __arraycount(sc->sc_mac); i++) { 2546 virtio_write_device_config_1(sc->sc_virtio, 2547 VIRTIO_NET_CONFIG_MAC + i, sc->sc_mac[i]); 2548 } 2549 r = 0; 2550 } 2551 2552 return r; 2553 } 2554 2555 static int 2556 vioif_set_rx_filter(struct vioif_softc *sc) 2557 { 2558 /* filter already set in ctrlq->ctrlq_mac_tbl */ 2559 struct virtio_softc *vsc = sc->sc_virtio; 2560 struct virtio_net_ctrl_mac_tbl *mac_tbl_uc, *mac_tbl_mc; 2561 struct vioif_ctrl_cmdspec specs[2]; 2562 int nspecs = __arraycount(specs); 2563 int r; 2564 2565 mac_tbl_uc = sc->sc_ctrlq.ctrlq_mac_tbl_uc; 2566 mac_tbl_mc = sc->sc_ctrlq.ctrlq_mac_tbl_mc; 2567 2568 if (!sc->sc_has_ctrl) 2569 return ENOTSUP; 2570 2571 vioif_ctrl_acquire(sc); 2572 2573 specs[0].dmamap = sc->sc_ctrlq.ctrlq_tbl_uc_dmamap; 2574 specs[0].buf = mac_tbl_uc; 2575 specs[0].bufsize = sizeof(*mac_tbl_uc) 2576 + (ETHER_ADDR_LEN * virtio_rw32(vsc, mac_tbl_uc->nentries)); 2577 2578 specs[1].dmamap = sc->sc_ctrlq.ctrlq_tbl_mc_dmamap; 2579 specs[1].buf = mac_tbl_mc; 2580 specs[1].bufsize = sizeof(*mac_tbl_mc) 2581 + (ETHER_ADDR_LEN * virtio_rw32(vsc, mac_tbl_mc->nentries)); 2582 2583 r = vioif_ctrl_load_cmdspec(sc, specs, nspecs); 2584 if (r != 0) 2585 goto out; 2586 2587 r = vioif_ctrl_send_command(sc, 2588 VIRTIO_NET_CTRL_MAC, VIRTIO_NET_CTRL_MAC_TABLE_SET, 2589 specs, nspecs); 2590 2591 vioif_ctrl_unload_cmdspec(sc, specs, nspecs); 2592 2593 out: 2594 vioif_ctrl_release(sc); 2595 2596 return r; 2597 } 2598 2599 /* 2600 * If multicast filter small enough (<=MAXENTRIES) set rx filter 2601 * If large multicast filter exist use ALLMULTI 2602 * If setting rx filter fails fall back to ALLMULTI 2603 */ 2604 static int 2605 vioif_rx_filter(struct vioif_softc *sc) 2606 { 2607 struct virtio_softc *vsc = sc->sc_virtio; 2608 struct ethercom *ec = &sc->sc_ethercom; 2609 struct ifnet *ifp = &ec->ec_if; 2610 struct ether_multi *enm; 2611 struct ether_multistep step; 2612 struct vioif_ctrlqueue *ctrlq = &sc->sc_ctrlq; 2613 int nentries; 2614 bool allmulti = 0; 2615 int r; 2616 2617 if (!sc->sc_has_ctrl) { 2618 goto set_ifflags; 2619 } 2620 2621 memcpy(ctrlq->ctrlq_mac_tbl_uc->macs[0], 2622 CLLADDR(ifp->if_sadl), ETHER_ADDR_LEN); 2623 2624 nentries = 0; 2625 allmulti = false; 2626 2627 ETHER_LOCK(ec); 2628 for (ETHER_FIRST_MULTI(step, ec, enm); enm != NULL; 2629 ETHER_NEXT_MULTI(step, enm)) { 2630 if (nentries >= VIRTIO_NET_CTRL_MAC_MAXENTRIES) { 2631 allmulti = true; 2632 break; 2633 } 2634 if (memcmp(enm->enm_addrlo, enm->enm_addrhi, ETHER_ADDR_LEN)) { 2635 allmulti = true; 2636 break; 2637 } 2638 2639 memcpy(ctrlq->ctrlq_mac_tbl_mc->macs[nentries], 2640 enm->enm_addrlo, ETHER_ADDR_LEN); 2641 nentries++; 2642 } 2643 ETHER_UNLOCK(ec); 2644 2645 r = vioif_set_mac_addr(sc); 2646 if (r != 0) { 2647 log(LOG_WARNING, "%s: couldn't set MAC address\n", 2648 ifp->if_xname); 2649 } 2650 2651 if (!allmulti) { 2652 ctrlq->ctrlq_mac_tbl_uc->nentries = virtio_rw32(vsc, 1); 2653 ctrlq->ctrlq_mac_tbl_mc->nentries = virtio_rw32(vsc, nentries); 2654 r = vioif_set_rx_filter(sc); 2655 if (r != 0) { 2656 allmulti = true; /* fallback */ 2657 } 2658 } 2659 2660 if (allmulti) { 2661 ctrlq->ctrlq_mac_tbl_uc->nentries = virtio_rw32(vsc, 0); 2662 ctrlq->ctrlq_mac_tbl_mc->nentries = virtio_rw32(vsc, 0); 2663 r = vioif_set_rx_filter(sc); 2664 if (r != 0) { 2665 log(LOG_DEBUG, "%s: couldn't clear RX filter\n", 2666 ifp->if_xname); 2667 /* what to do on failure? */ 2668 } 2669 2670 ifp->if_flags |= IFF_ALLMULTI; 2671 } 2672 2673 set_ifflags: 2674 r = vioif_ifflags(sc); 2675 2676 return r; 2677 } 2678 2679 /* 2680 * VM configuration changes 2681 */ 2682 static int 2683 vioif_config_change(struct virtio_softc *vsc) 2684 { 2685 struct vioif_softc *sc = device_private(virtio_child(vsc)); 2686 2687 softint_schedule(sc->sc_cfg_softint); 2688 return 0; 2689 } 2690 2691 static void 2692 vioif_cfg_softint(void *arg) 2693 { 2694 struct vioif_softc *sc = arg; 2695 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 2696 2697 vioif_update_link_status(sc); 2698 vioif_start(ifp); 2699 } 2700 2701 static int 2702 vioif_get_link_status(struct vioif_softc *sc) 2703 { 2704 struct virtio_softc *vsc = sc->sc_virtio; 2705 uint16_t status; 2706 2707 if (virtio_features(vsc) & VIRTIO_NET_F_STATUS) 2708 status = virtio_read_device_config_2(vsc, 2709 VIRTIO_NET_CONFIG_STATUS); 2710 else 2711 status = VIRTIO_NET_S_LINK_UP; 2712 2713 if ((status & VIRTIO_NET_S_LINK_UP) != 0) 2714 return LINK_STATE_UP; 2715 2716 return LINK_STATE_DOWN; 2717 } 2718 2719 static void 2720 vioif_update_link_status(struct vioif_softc *sc) 2721 { 2722 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 2723 struct vioif_netqueue *netq; 2724 struct vioif_tx_context *txc; 2725 bool active; 2726 int link, i; 2727 2728 mutex_enter(&sc->sc_lock); 2729 2730 link = vioif_get_link_status(sc); 2731 2732 if (link == sc->sc_link_state) 2733 goto done; 2734 2735 sc->sc_link_state = link; 2736 2737 active = VIOIF_IS_LINK_ACTIVE(sc); 2738 for (i = 0; i < sc->sc_act_nvq_pairs; i++) { 2739 netq = &sc->sc_netqs[VIOIF_NETQ_TXQID(i)]; 2740 2741 mutex_enter(&netq->netq_lock); 2742 txc = netq->netq_ctx; 2743 txc->txc_link_active = active; 2744 mutex_exit(&netq->netq_lock); 2745 } 2746 2747 if_link_state_change(ifp, sc->sc_link_state); 2748 2749 done: 2750 mutex_exit(&sc->sc_lock); 2751 } 2752 2753 static void 2754 vioif_workq_work(struct work *wk, void *context) 2755 { 2756 struct vioif_work *work; 2757 2758 work = container_of(wk, struct vioif_work, cookie); 2759 2760 atomic_store_relaxed(&work->added, 0); 2761 work->func(work->arg); 2762 } 2763 2764 static struct workqueue * 2765 vioif_workq_create(const char *name, pri_t prio, int ipl, int flags) 2766 { 2767 struct workqueue *wq; 2768 int error; 2769 2770 error = workqueue_create(&wq, name, vioif_workq_work, NULL, 2771 prio, ipl, flags); 2772 2773 if (error) 2774 return NULL; 2775 2776 return wq; 2777 } 2778 2779 static void 2780 vioif_workq_destroy(struct workqueue *wq) 2781 { 2782 2783 workqueue_destroy(wq); 2784 } 2785 2786 static void 2787 vioif_work_set(struct vioif_work *work, void (*func)(void *), void *arg) 2788 { 2789 2790 memset(work, 0, sizeof(*work)); 2791 work->func = func; 2792 work->arg = arg; 2793 } 2794 2795 static void 2796 vioif_work_add(struct workqueue *wq, struct vioif_work *work) 2797 { 2798 2799 if (atomic_load_relaxed(&work->added) != 0) 2800 return; 2801 2802 atomic_store_relaxed(&work->added, 1); 2803 kpreempt_disable(); 2804 workqueue_enqueue(wq, &work->cookie, NULL); 2805 kpreempt_enable(); 2806 } 2807 2808 static void 2809 vioif_work_wait(struct workqueue *wq, struct vioif_work *work) 2810 { 2811 2812 workqueue_wait(wq, &work->cookie); 2813 } 2814 2815 MODULE(MODULE_CLASS_DRIVER, if_vioif, "virtio"); 2816 2817 #ifdef _MODULE 2818 #include "ioconf.c" 2819 #endif 2820 2821 static int 2822 if_vioif_modcmd(modcmd_t cmd, void *opaque) 2823 { 2824 int error = 0; 2825 2826 #ifdef _MODULE 2827 switch (cmd) { 2828 case MODULE_CMD_INIT: 2829 error = config_init_component(cfdriver_ioconf_if_vioif, 2830 cfattach_ioconf_if_vioif, cfdata_ioconf_if_vioif); 2831 break; 2832 case MODULE_CMD_FINI: 2833 error = config_fini_component(cfdriver_ioconf_if_vioif, 2834 cfattach_ioconf_if_vioif, cfdata_ioconf_if_vioif); 2835 break; 2836 default: 2837 error = ENOTTY; 2838 break; 2839 } 2840 #endif 2841 2842 return error; 2843 } 2844