1 /*- 2 * Copyright (c) 2016, Vincenzo Maffione 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* Driver for ptnet paravirtualized network device. */ 30 31 #include <sys/cdefs.h> 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/sockio.h> 38 #include <sys/mbuf.h> 39 #include <sys/malloc.h> 40 #include <sys/module.h> 41 #include <sys/socket.h> 42 #include <sys/sysctl.h> 43 #include <sys/lock.h> 44 #include <sys/mutex.h> 45 #include <sys/taskqueue.h> 46 #include <sys/smp.h> 47 #include <sys/time.h> 48 #include <machine/smp.h> 49 50 #include <vm/uma.h> 51 #include <vm/vm.h> 52 #include <vm/pmap.h> 53 54 #include <net/ethernet.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 #include <net/bpf.h> 63 64 #include <netinet/in_systm.h> 65 #include <netinet/in.h> 66 #include <netinet/ip.h> 67 #include <netinet/ip6.h> 68 #include <netinet6/ip6_var.h> 69 #include <netinet/udp.h> 70 #include <netinet/tcp.h> 71 #include <netinet/sctp.h> 72 73 #include <machine/bus.h> 74 #include <machine/resource.h> 75 #include <sys/bus.h> 76 #include <sys/rman.h> 77 78 #include <dev/pci/pcivar.h> 79 #include <dev/pci/pcireg.h> 80 81 #include "opt_inet.h" 82 #include "opt_inet6.h" 83 84 #include <sys/selinfo.h> 85 #include <net/netmap.h> 86 #include <dev/netmap/netmap_kern.h> 87 #include <net/netmap_virt.h> 88 #include <dev/netmap/netmap_mem2.h> 89 #include <dev/virtio/network/virtio_net.h> 90 91 #ifndef INET 92 #error "INET not defined, cannot support offloadings" 93 #endif 94 95 #if __FreeBSD_version >= 1100000 96 static uint64_t ptnet_get_counter(if_t, ift_counter); 97 #else 98 typedef struct ifnet *if_t; 99 #define if_getsoftc(_ifp) (_ifp)->if_softc 100 #endif 101 102 //#define PTNETMAP_STATS 103 //#define DEBUG 104 #ifdef DEBUG 105 #define DBG(x) x 106 #else /* !DEBUG */ 107 #define DBG(x) 108 #endif /* !DEBUG */ 109 110 extern int ptnet_vnet_hdr; /* Tunable parameter */ 111 112 struct ptnet_softc; 113 114 struct ptnet_queue_stats { 115 uint64_t packets; /* if_[io]packets */ 116 uint64_t bytes; /* if_[io]bytes */ 117 uint64_t errors; /* if_[io]errors */ 118 uint64_t iqdrops; /* if_iqdrops */ 119 uint64_t mcasts; /* if_[io]mcasts */ 120 #ifdef PTNETMAP_STATS 121 uint64_t intrs; 122 uint64_t kicks; 123 #endif /* PTNETMAP_STATS */ 124 }; 125 126 struct ptnet_queue { 127 struct ptnet_softc *sc; 128 struct resource *irq; 129 void *cookie; 130 int kring_id; 131 struct nm_csb_atok *atok; 132 struct nm_csb_ktoa *ktoa; 133 unsigned int kick; 134 struct mtx lock; 135 struct buf_ring *bufring; /* for TX queues */ 136 struct ptnet_queue_stats stats; 137 #ifdef PTNETMAP_STATS 138 struct ptnet_queue_stats last_stats; 139 #endif /* PTNETMAP_STATS */ 140 struct taskqueue *taskq; 141 struct task task; 142 char lock_name[16]; 143 }; 144 145 #define PTNET_Q_LOCK(_pq) mtx_lock(&(_pq)->lock) 146 #define PTNET_Q_TRYLOCK(_pq) mtx_trylock(&(_pq)->lock) 147 #define PTNET_Q_UNLOCK(_pq) mtx_unlock(&(_pq)->lock) 148 149 struct ptnet_softc { 150 device_t dev; 151 if_t ifp; 152 struct ifmedia media; 153 struct mtx lock; 154 char lock_name[16]; 155 char hwaddr[ETHER_ADDR_LEN]; 156 157 /* Mirror of PTFEAT register. */ 158 uint32_t ptfeatures; 159 unsigned int vnet_hdr_len; 160 161 /* PCI BARs support. */ 162 struct resource *iomem; 163 struct resource *msix_mem; 164 165 unsigned int num_rings; 166 unsigned int num_tx_rings; 167 struct ptnet_queue *queues; 168 struct ptnet_queue *rxqueues; 169 struct nm_csb_atok *csb_gh; 170 struct nm_csb_ktoa *csb_hg; 171 172 unsigned int min_tx_space; 173 174 struct netmap_pt_guest_adapter *ptna; 175 176 struct callout tick; 177 #ifdef PTNETMAP_STATS 178 struct timeval last_ts; 179 #endif /* PTNETMAP_STATS */ 180 }; 181 182 #define PTNET_CORE_LOCK(_sc) mtx_lock(&(_sc)->lock) 183 #define PTNET_CORE_UNLOCK(_sc) mtx_unlock(&(_sc)->lock) 184 185 static int ptnet_probe(device_t); 186 static int ptnet_attach(device_t); 187 static int ptnet_detach(device_t); 188 static int ptnet_suspend(device_t); 189 static int ptnet_resume(device_t); 190 static int ptnet_shutdown(device_t); 191 192 static void ptnet_init(void *opaque); 193 static int ptnet_ioctl(if_t ifp, u_long cmd, caddr_t data); 194 static int ptnet_init_locked(struct ptnet_softc *sc); 195 static int ptnet_stop(struct ptnet_softc *sc); 196 static int ptnet_transmit(if_t ifp, struct mbuf *m); 197 static int ptnet_drain_transmit_queue(struct ptnet_queue *pq, 198 unsigned int budget, 199 bool may_resched); 200 static void ptnet_qflush(if_t ifp); 201 static void ptnet_tx_task(void *context, int pending); 202 203 static int ptnet_media_change(if_t ifp); 204 static void ptnet_media_status(if_t ifp, struct ifmediareq *ifmr); 205 #ifdef PTNETMAP_STATS 206 static void ptnet_tick(void *opaque); 207 #endif 208 209 static int ptnet_irqs_init(struct ptnet_softc *sc); 210 static void ptnet_irqs_fini(struct ptnet_softc *sc); 211 212 static uint32_t ptnet_nm_ptctl(struct ptnet_softc *sc, uint32_t cmd); 213 static int ptnet_nm_config(struct netmap_adapter *na, 214 struct nm_config_info *info); 215 static void ptnet_update_vnet_hdr(struct ptnet_softc *sc); 216 static int ptnet_nm_register(struct netmap_adapter *na, int onoff); 217 static int ptnet_nm_txsync(struct netmap_kring *kring, int flags); 218 static int ptnet_nm_rxsync(struct netmap_kring *kring, int flags); 219 static void ptnet_nm_intr(struct netmap_adapter *na, int onoff); 220 221 static void ptnet_tx_intr(void *opaque); 222 static void ptnet_rx_intr(void *opaque); 223 224 static unsigned ptnet_rx_discard(struct netmap_kring *kring, 225 unsigned int head); 226 static int ptnet_rx_eof(struct ptnet_queue *pq, unsigned int budget, 227 bool may_resched); 228 static void ptnet_rx_task(void *context, int pending); 229 230 #ifdef DEVICE_POLLING 231 static poll_handler_t ptnet_poll; 232 #endif 233 234 static device_method_t ptnet_methods[] = { 235 DEVMETHOD(device_probe, ptnet_probe), 236 DEVMETHOD(device_attach, ptnet_attach), 237 DEVMETHOD(device_detach, ptnet_detach), 238 DEVMETHOD(device_suspend, ptnet_suspend), 239 DEVMETHOD(device_resume, ptnet_resume), 240 DEVMETHOD(device_shutdown, ptnet_shutdown), 241 DEVMETHOD_END 242 }; 243 244 static driver_t ptnet_driver = { 245 "ptnet", 246 ptnet_methods, 247 sizeof(struct ptnet_softc) 248 }; 249 250 /* We use (SI_ORDER_MIDDLE+2) here, see DEV_MODULE_ORDERED() invocation. */ 251 static devclass_t ptnet_devclass; 252 DRIVER_MODULE_ORDERED(ptnet, pci, ptnet_driver, ptnet_devclass, 253 NULL, NULL, SI_ORDER_MIDDLE + 2); 254 255 static int 256 ptnet_probe(device_t dev) 257 { 258 if (pci_get_vendor(dev) != PTNETMAP_PCI_VENDOR_ID || 259 pci_get_device(dev) != PTNETMAP_PCI_NETIF_ID) { 260 return (ENXIO); 261 } 262 263 device_set_desc(dev, "ptnet network adapter"); 264 265 return (BUS_PROBE_DEFAULT); 266 } 267 268 static inline void ptnet_kick(struct ptnet_queue *pq) 269 { 270 #ifdef PTNETMAP_STATS 271 pq->stats.kicks ++; 272 #endif /* PTNETMAP_STATS */ 273 bus_write_4(pq->sc->iomem, pq->kick, 0); 274 } 275 276 #define PTNET_BUF_RING_SIZE 4096 277 #define PTNET_RX_BUDGET 512 278 #define PTNET_RX_BATCH 1 279 #define PTNET_TX_BUDGET 512 280 #define PTNET_TX_BATCH 64 281 #define PTNET_HDR_SIZE sizeof(struct virtio_net_hdr_mrg_rxbuf) 282 #define PTNET_MAX_PKT_SIZE 65536 283 284 #define PTNET_CSUM_OFFLOAD (CSUM_TCP | CSUM_UDP | CSUM_SCTP) 285 #define PTNET_CSUM_OFFLOAD_IPV6 (CSUM_TCP_IPV6 | CSUM_UDP_IPV6 |\ 286 CSUM_SCTP_IPV6) 287 #define PTNET_ALL_OFFLOAD (CSUM_TSO | PTNET_CSUM_OFFLOAD |\ 288 PTNET_CSUM_OFFLOAD_IPV6) 289 290 static int 291 ptnet_attach(device_t dev) 292 { 293 uint32_t ptfeatures = 0; 294 unsigned int num_rx_rings, num_tx_rings; 295 struct netmap_adapter na_arg; 296 unsigned int nifp_offset; 297 struct ptnet_softc *sc; 298 if_t ifp; 299 uint32_t macreg; 300 int err, rid; 301 int i; 302 303 sc = device_get_softc(dev); 304 sc->dev = dev; 305 306 /* Setup PCI resources. */ 307 pci_enable_busmaster(dev); 308 309 rid = PCIR_BAR(PTNETMAP_IO_PCI_BAR); 310 sc->iomem = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, 311 RF_ACTIVE); 312 if (sc->iomem == NULL) { 313 device_printf(dev, "Failed to map I/O BAR\n"); 314 return (ENXIO); 315 } 316 317 /* Negotiate features with the hypervisor. */ 318 if (ptnet_vnet_hdr) { 319 ptfeatures |= PTNETMAP_F_VNET_HDR; 320 } 321 bus_write_4(sc->iomem, PTNET_IO_PTFEAT, ptfeatures); /* wanted */ 322 ptfeatures = bus_read_4(sc->iomem, PTNET_IO_PTFEAT); /* acked */ 323 sc->ptfeatures = ptfeatures; 324 325 num_tx_rings = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_RINGS); 326 num_rx_rings = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_RINGS); 327 sc->num_rings = num_tx_rings + num_rx_rings; 328 sc->num_tx_rings = num_tx_rings; 329 330 if (sc->num_rings * sizeof(struct nm_csb_atok) > PAGE_SIZE) { 331 device_printf(dev, "CSB cannot handle that many rings (%u)\n", 332 sc->num_rings); 333 err = ENOMEM; 334 goto err_path; 335 } 336 337 /* Allocate CSB and carry out CSB allocation protocol. */ 338 sc->csb_gh = contigmalloc(2*PAGE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO, 339 (size_t)0, -1UL, PAGE_SIZE, 0); 340 if (sc->csb_gh == NULL) { 341 device_printf(dev, "Failed to allocate CSB\n"); 342 err = ENOMEM; 343 goto err_path; 344 } 345 sc->csb_hg = (struct nm_csb_ktoa *)(((char *)sc->csb_gh) + PAGE_SIZE); 346 347 { 348 /* 349 * We use uint64_t rather than vm_paddr_t since we 350 * need 64 bit addresses even on 32 bit platforms. 351 */ 352 uint64_t paddr = vtophys(sc->csb_gh); 353 354 /* CSB allocation protocol: write to BAH first, then 355 * to BAL (for both GH and HG sections). */ 356 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAH, 357 (paddr >> 32) & 0xffffffff); 358 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAL, 359 paddr & 0xffffffff); 360 paddr = vtophys(sc->csb_hg); 361 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAH, 362 (paddr >> 32) & 0xffffffff); 363 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAL, 364 paddr & 0xffffffff); 365 } 366 367 /* Allocate and initialize per-queue data structures. */ 368 sc->queues = malloc(sizeof(struct ptnet_queue) * sc->num_rings, 369 M_DEVBUF, M_NOWAIT | M_ZERO); 370 if (sc->queues == NULL) { 371 err = ENOMEM; 372 goto err_path; 373 } 374 sc->rxqueues = sc->queues + num_tx_rings; 375 376 for (i = 0; i < sc->num_rings; i++) { 377 struct ptnet_queue *pq = sc->queues + i; 378 379 pq->sc = sc; 380 pq->kring_id = i; 381 pq->kick = PTNET_IO_KICK_BASE + 4 * i; 382 pq->atok = sc->csb_gh + i; 383 pq->ktoa = sc->csb_hg + i; 384 snprintf(pq->lock_name, sizeof(pq->lock_name), "%s-%d", 385 device_get_nameunit(dev), i); 386 mtx_init(&pq->lock, pq->lock_name, NULL, MTX_DEF); 387 if (i >= num_tx_rings) { 388 /* RX queue: fix kring_id. */ 389 pq->kring_id -= num_tx_rings; 390 } else { 391 /* TX queue: allocate buf_ring. */ 392 pq->bufring = buf_ring_alloc(PTNET_BUF_RING_SIZE, 393 M_DEVBUF, M_NOWAIT, &pq->lock); 394 if (pq->bufring == NULL) { 395 err = ENOMEM; 396 goto err_path; 397 } 398 } 399 } 400 401 sc->min_tx_space = 64; /* Safe initial value. */ 402 403 err = ptnet_irqs_init(sc); 404 if (err) { 405 goto err_path; 406 } 407 408 /* Setup Ethernet interface. */ 409 sc->ifp = ifp = if_alloc(IFT_ETHER); 410 if (ifp == NULL) { 411 device_printf(dev, "Failed to allocate ifnet\n"); 412 err = ENOMEM; 413 goto err_path; 414 } 415 416 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 417 ifp->if_baudrate = IF_Gbps(10); 418 ifp->if_softc = sc; 419 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX; 420 ifp->if_init = ptnet_init; 421 ifp->if_ioctl = ptnet_ioctl; 422 #if __FreeBSD_version >= 1100000 423 ifp->if_get_counter = ptnet_get_counter; 424 #endif 425 ifp->if_transmit = ptnet_transmit; 426 ifp->if_qflush = ptnet_qflush; 427 428 ifmedia_init(&sc->media, IFM_IMASK, ptnet_media_change, 429 ptnet_media_status); 430 ifmedia_add(&sc->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL); 431 ifmedia_set(&sc->media, IFM_ETHER | IFM_10G_T | IFM_FDX); 432 433 macreg = bus_read_4(sc->iomem, PTNET_IO_MAC_HI); 434 sc->hwaddr[0] = (macreg >> 8) & 0xff; 435 sc->hwaddr[1] = macreg & 0xff; 436 macreg = bus_read_4(sc->iomem, PTNET_IO_MAC_LO); 437 sc->hwaddr[2] = (macreg >> 24) & 0xff; 438 sc->hwaddr[3] = (macreg >> 16) & 0xff; 439 sc->hwaddr[4] = (macreg >> 8) & 0xff; 440 sc->hwaddr[5] = macreg & 0xff; 441 442 ether_ifattach(ifp, sc->hwaddr); 443 444 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 445 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU; 446 447 if (sc->ptfeatures & PTNETMAP_F_VNET_HDR) { 448 /* Similarly to what the vtnet driver does, we can emulate 449 * VLAN offloadings by inserting and removing the 802.1Q 450 * header during transmit and receive. We are then able 451 * to do checksum offloading of VLAN frames. */ 452 ifp->if_capabilities |= IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 453 | IFCAP_VLAN_HWCSUM 454 | IFCAP_TSO | IFCAP_LRO 455 | IFCAP_VLAN_HWTSO 456 | IFCAP_VLAN_HWTAGGING; 457 } 458 459 ifp->if_capenable = ifp->if_capabilities; 460 #ifdef DEVICE_POLLING 461 /* Don't enable polling by default. */ 462 ifp->if_capabilities |= IFCAP_POLLING; 463 #endif 464 snprintf(sc->lock_name, sizeof(sc->lock_name), 465 "%s", device_get_nameunit(dev)); 466 mtx_init(&sc->lock, sc->lock_name, "ptnet core lock", MTX_DEF); 467 callout_init_mtx(&sc->tick, &sc->lock, 0); 468 469 /* Prepare a netmap_adapter struct instance to do netmap_attach(). */ 470 nifp_offset = bus_read_4(sc->iomem, PTNET_IO_NIFP_OFS); 471 memset(&na_arg, 0, sizeof(na_arg)); 472 na_arg.ifp = ifp; 473 na_arg.num_tx_desc = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_SLOTS); 474 na_arg.num_rx_desc = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_SLOTS); 475 na_arg.num_tx_rings = num_tx_rings; 476 na_arg.num_rx_rings = num_rx_rings; 477 na_arg.nm_config = ptnet_nm_config; 478 na_arg.nm_krings_create = ptnet_nm_krings_create; 479 na_arg.nm_krings_delete = ptnet_nm_krings_delete; 480 na_arg.nm_dtor = ptnet_nm_dtor; 481 na_arg.nm_intr = ptnet_nm_intr; 482 na_arg.nm_register = ptnet_nm_register; 483 na_arg.nm_txsync = ptnet_nm_txsync; 484 na_arg.nm_rxsync = ptnet_nm_rxsync; 485 486 netmap_pt_guest_attach(&na_arg, nifp_offset, 487 bus_read_4(sc->iomem, PTNET_IO_HOSTMEMID)); 488 489 /* Now a netmap adapter for this ifp has been allocated, and it 490 * can be accessed through NA(ifp). We also have to initialize the CSB 491 * pointer. */ 492 sc->ptna = (struct netmap_pt_guest_adapter *)NA(ifp); 493 494 /* If virtio-net header was negotiated, set the virt_hdr_len field in 495 * the netmap adapter, to inform users that this netmap adapter requires 496 * the application to deal with the headers. */ 497 ptnet_update_vnet_hdr(sc); 498 499 device_printf(dev, "%s() completed\n", __func__); 500 501 return (0); 502 503 err_path: 504 ptnet_detach(dev); 505 return err; 506 } 507 508 /* Stop host sync-kloop if it was running. */ 509 static void 510 ptnet_device_shutdown(struct ptnet_softc *sc) 511 { 512 ptnet_nm_ptctl(sc, PTNETMAP_PTCTL_DELETE); 513 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAH, 0); 514 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAL, 0); 515 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAH, 0); 516 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAL, 0); 517 } 518 519 static int 520 ptnet_detach(device_t dev) 521 { 522 struct ptnet_softc *sc = device_get_softc(dev); 523 int i; 524 525 ptnet_device_shutdown(sc); 526 527 #ifdef DEVICE_POLLING 528 if (sc->ifp->if_capenable & IFCAP_POLLING) { 529 ether_poll_deregister(sc->ifp); 530 } 531 #endif 532 callout_drain(&sc->tick); 533 534 if (sc->queues) { 535 /* Drain taskqueues before calling if_detach. */ 536 for (i = 0; i < sc->num_rings; i++) { 537 struct ptnet_queue *pq = sc->queues + i; 538 539 if (pq->taskq) { 540 taskqueue_drain(pq->taskq, &pq->task); 541 } 542 } 543 } 544 545 if (sc->ifp) { 546 ether_ifdetach(sc->ifp); 547 548 /* Uninitialize netmap adapters for this device. */ 549 netmap_detach(sc->ifp); 550 551 ifmedia_removeall(&sc->media); 552 if_free(sc->ifp); 553 sc->ifp = NULL; 554 } 555 556 ptnet_irqs_fini(sc); 557 558 if (sc->csb_gh) { 559 contigfree(sc->csb_gh, 2*PAGE_SIZE, M_DEVBUF); 560 sc->csb_gh = NULL; 561 sc->csb_hg = NULL; 562 } 563 564 if (sc->queues) { 565 for (i = 0; i < sc->num_rings; i++) { 566 struct ptnet_queue *pq = sc->queues + i; 567 568 if (mtx_initialized(&pq->lock)) { 569 mtx_destroy(&pq->lock); 570 } 571 if (pq->bufring != NULL) { 572 buf_ring_free(pq->bufring, M_DEVBUF); 573 } 574 } 575 free(sc->queues, M_DEVBUF); 576 sc->queues = NULL; 577 } 578 579 if (sc->iomem) { 580 bus_release_resource(dev, SYS_RES_IOPORT, 581 PCIR_BAR(PTNETMAP_IO_PCI_BAR), sc->iomem); 582 sc->iomem = NULL; 583 } 584 585 mtx_destroy(&sc->lock); 586 587 device_printf(dev, "%s() completed\n", __func__); 588 589 return (0); 590 } 591 592 static int 593 ptnet_suspend(device_t dev) 594 { 595 struct ptnet_softc *sc = device_get_softc(dev); 596 597 (void)sc; 598 599 return (0); 600 } 601 602 static int 603 ptnet_resume(device_t dev) 604 { 605 struct ptnet_softc *sc = device_get_softc(dev); 606 607 (void)sc; 608 609 return (0); 610 } 611 612 static int 613 ptnet_shutdown(device_t dev) 614 { 615 struct ptnet_softc *sc = device_get_softc(dev); 616 617 ptnet_device_shutdown(sc); 618 619 return (0); 620 } 621 622 static int 623 ptnet_irqs_init(struct ptnet_softc *sc) 624 { 625 int rid = PCIR_BAR(PTNETMAP_MSIX_PCI_BAR); 626 int nvecs = sc->num_rings; 627 device_t dev = sc->dev; 628 int err = ENOSPC; 629 int cpu_cur; 630 int i; 631 632 if (pci_find_cap(dev, PCIY_MSIX, NULL) != 0) { 633 device_printf(dev, "Could not find MSI-X capability\n"); 634 return (ENXIO); 635 } 636 637 sc->msix_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 638 &rid, RF_ACTIVE); 639 if (sc->msix_mem == NULL) { 640 device_printf(dev, "Failed to allocate MSIX PCI BAR\n"); 641 return (ENXIO); 642 } 643 644 if (pci_msix_count(dev) < nvecs) { 645 device_printf(dev, "Not enough MSI-X vectors\n"); 646 goto err_path; 647 } 648 649 err = pci_alloc_msix(dev, &nvecs); 650 if (err) { 651 device_printf(dev, "Failed to allocate MSI-X vectors\n"); 652 goto err_path; 653 } 654 655 for (i = 0; i < nvecs; i++) { 656 struct ptnet_queue *pq = sc->queues + i; 657 658 rid = i + 1; 659 pq->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 660 RF_ACTIVE); 661 if (pq->irq == NULL) { 662 device_printf(dev, "Failed to allocate interrupt " 663 "for queue #%d\n", i); 664 err = ENOSPC; 665 goto err_path; 666 } 667 } 668 669 cpu_cur = CPU_FIRST(); 670 for (i = 0; i < nvecs; i++) { 671 struct ptnet_queue *pq = sc->queues + i; 672 void (*handler)(void *) = ptnet_tx_intr; 673 674 if (i >= sc->num_tx_rings) { 675 handler = ptnet_rx_intr; 676 } 677 err = bus_setup_intr(dev, pq->irq, INTR_TYPE_NET | INTR_MPSAFE, 678 NULL /* intr_filter */, handler, 679 pq, &pq->cookie); 680 if (err) { 681 device_printf(dev, "Failed to register intr handler " 682 "for queue #%d\n", i); 683 goto err_path; 684 } 685 686 bus_describe_intr(dev, pq->irq, pq->cookie, "q%d", i); 687 #if 0 688 bus_bind_intr(sc->dev, pq->irq, cpu_cur); 689 #endif 690 cpu_cur = CPU_NEXT(cpu_cur); 691 } 692 693 device_printf(dev, "Allocated %d MSI-X vectors\n", nvecs); 694 695 cpu_cur = CPU_FIRST(); 696 for (i = 0; i < nvecs; i++) { 697 struct ptnet_queue *pq = sc->queues + i; 698 static void (*handler)(void *context, int pending); 699 700 handler = (i < sc->num_tx_rings) ? ptnet_tx_task : ptnet_rx_task; 701 702 TASK_INIT(&pq->task, 0, handler, pq); 703 pq->taskq = taskqueue_create_fast("ptnet_queue", M_NOWAIT, 704 taskqueue_thread_enqueue, &pq->taskq); 705 taskqueue_start_threads(&pq->taskq, 1, PI_NET, "%s-pq-%d", 706 device_get_nameunit(sc->dev), cpu_cur); 707 cpu_cur = CPU_NEXT(cpu_cur); 708 } 709 710 return 0; 711 err_path: 712 ptnet_irqs_fini(sc); 713 return err; 714 } 715 716 static void 717 ptnet_irqs_fini(struct ptnet_softc *sc) 718 { 719 device_t dev = sc->dev; 720 int i; 721 722 for (i = 0; i < sc->num_rings; i++) { 723 struct ptnet_queue *pq = sc->queues + i; 724 725 if (pq->taskq) { 726 taskqueue_free(pq->taskq); 727 pq->taskq = NULL; 728 } 729 730 if (pq->cookie) { 731 bus_teardown_intr(dev, pq->irq, pq->cookie); 732 pq->cookie = NULL; 733 } 734 735 if (pq->irq) { 736 bus_release_resource(dev, SYS_RES_IRQ, i + 1, pq->irq); 737 pq->irq = NULL; 738 } 739 } 740 741 if (sc->msix_mem) { 742 pci_release_msi(dev); 743 744 bus_release_resource(dev, SYS_RES_MEMORY, 745 PCIR_BAR(PTNETMAP_MSIX_PCI_BAR), 746 sc->msix_mem); 747 sc->msix_mem = NULL; 748 } 749 } 750 751 static void 752 ptnet_init(void *opaque) 753 { 754 struct ptnet_softc *sc = opaque; 755 756 PTNET_CORE_LOCK(sc); 757 ptnet_init_locked(sc); 758 PTNET_CORE_UNLOCK(sc); 759 } 760 761 static int 762 ptnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 763 { 764 struct ptnet_softc *sc = if_getsoftc(ifp); 765 device_t dev = sc->dev; 766 struct ifreq *ifr = (struct ifreq *)data; 767 int mask __unused, err = 0; 768 769 switch (cmd) { 770 case SIOCSIFFLAGS: 771 device_printf(dev, "SIOCSIFFLAGS %x\n", ifp->if_flags); 772 PTNET_CORE_LOCK(sc); 773 if (ifp->if_flags & IFF_UP) { 774 /* Network stack wants the iff to be up. */ 775 err = ptnet_init_locked(sc); 776 } else { 777 /* Network stack wants the iff to be down. */ 778 err = ptnet_stop(sc); 779 } 780 /* We don't need to do nothing to support IFF_PROMISC, 781 * since that is managed by the backend port. */ 782 PTNET_CORE_UNLOCK(sc); 783 break; 784 785 case SIOCSIFCAP: 786 device_printf(dev, "SIOCSIFCAP %x %x\n", 787 ifr->ifr_reqcap, ifp->if_capenable); 788 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 789 #ifdef DEVICE_POLLING 790 if (mask & IFCAP_POLLING) { 791 struct ptnet_queue *pq; 792 int i; 793 794 if (ifr->ifr_reqcap & IFCAP_POLLING) { 795 err = ether_poll_register(ptnet_poll, ifp); 796 if (err) { 797 break; 798 } 799 /* Stop queues and sync with taskqueues. */ 800 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 801 for (i = 0; i < sc->num_rings; i++) { 802 pq = sc-> queues + i; 803 /* Make sure the worker sees the 804 * IFF_DRV_RUNNING down. */ 805 PTNET_Q_LOCK(pq); 806 pq->atok->appl_need_kick = 0; 807 PTNET_Q_UNLOCK(pq); 808 /* Wait for rescheduling to finish. */ 809 if (pq->taskq) { 810 taskqueue_drain(pq->taskq, 811 &pq->task); 812 } 813 } 814 ifp->if_drv_flags |= IFF_DRV_RUNNING; 815 } else { 816 err = ether_poll_deregister(ifp); 817 for (i = 0; i < sc->num_rings; i++) { 818 pq = sc-> queues + i; 819 PTNET_Q_LOCK(pq); 820 pq->atok->appl_need_kick = 1; 821 PTNET_Q_UNLOCK(pq); 822 } 823 } 824 } 825 #endif /* DEVICE_POLLING */ 826 ifp->if_capenable = ifr->ifr_reqcap; 827 break; 828 829 case SIOCSIFMTU: 830 /* We support any reasonable MTU. */ 831 if (ifr->ifr_mtu < ETHERMIN || 832 ifr->ifr_mtu > PTNET_MAX_PKT_SIZE) { 833 err = EINVAL; 834 } else { 835 PTNET_CORE_LOCK(sc); 836 ifp->if_mtu = ifr->ifr_mtu; 837 PTNET_CORE_UNLOCK(sc); 838 } 839 break; 840 841 case SIOCSIFMEDIA: 842 case SIOCGIFMEDIA: 843 err = ifmedia_ioctl(ifp, ifr, &sc->media, cmd); 844 break; 845 846 default: 847 err = ether_ioctl(ifp, cmd, data); 848 break; 849 } 850 851 return err; 852 } 853 854 static int 855 ptnet_init_locked(struct ptnet_softc *sc) 856 { 857 if_t ifp = sc->ifp; 858 struct netmap_adapter *na_dr = &sc->ptna->dr.up; 859 struct netmap_adapter *na_nm = &sc->ptna->hwup.up; 860 unsigned int nm_buf_size; 861 int ret; 862 863 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 864 return 0; /* nothing to do */ 865 } 866 867 device_printf(sc->dev, "%s\n", __func__); 868 869 /* Translate offload capabilities according to if_capenable. */ 870 ifp->if_hwassist = 0; 871 if (ifp->if_capenable & IFCAP_TXCSUM) 872 ifp->if_hwassist |= PTNET_CSUM_OFFLOAD; 873 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 874 ifp->if_hwassist |= PTNET_CSUM_OFFLOAD_IPV6; 875 if (ifp->if_capenable & IFCAP_TSO4) 876 ifp->if_hwassist |= CSUM_IP_TSO; 877 if (ifp->if_capenable & IFCAP_TSO6) 878 ifp->if_hwassist |= CSUM_IP6_TSO; 879 880 /* 881 * Prepare the interface for netmap mode access. 882 */ 883 netmap_update_config(na_dr); 884 885 ret = netmap_mem_finalize(na_dr->nm_mem, na_dr); 886 if (ret) { 887 device_printf(sc->dev, "netmap_mem_finalize() failed\n"); 888 return ret; 889 } 890 891 if (sc->ptna->backend_users == 0) { 892 ret = ptnet_nm_krings_create(na_nm); 893 if (ret) { 894 device_printf(sc->dev, "ptnet_nm_krings_create() " 895 "failed\n"); 896 goto err_mem_finalize; 897 } 898 899 ret = netmap_mem_rings_create(na_dr); 900 if (ret) { 901 device_printf(sc->dev, "netmap_mem_rings_create() " 902 "failed\n"); 903 goto err_rings_create; 904 } 905 906 ret = netmap_mem_get_lut(na_dr->nm_mem, &na_dr->na_lut); 907 if (ret) { 908 device_printf(sc->dev, "netmap_mem_get_lut() " 909 "failed\n"); 910 goto err_get_lut; 911 } 912 } 913 914 ret = ptnet_nm_register(na_dr, 1 /* on */); 915 if (ret) { 916 goto err_register; 917 } 918 919 nm_buf_size = NETMAP_BUF_SIZE(na_dr); 920 921 KASSERT(nm_buf_size > 0, ("Invalid netmap buffer size")); 922 sc->min_tx_space = PTNET_MAX_PKT_SIZE / nm_buf_size + 2; 923 device_printf(sc->dev, "%s: min_tx_space = %u\n", __func__, 924 sc->min_tx_space); 925 #ifdef PTNETMAP_STATS 926 callout_reset(&sc->tick, hz, ptnet_tick, sc); 927 #endif 928 929 ifp->if_drv_flags |= IFF_DRV_RUNNING; 930 931 return 0; 932 933 err_register: 934 memset(&na_dr->na_lut, 0, sizeof(na_dr->na_lut)); 935 err_get_lut: 936 netmap_mem_rings_delete(na_dr); 937 err_rings_create: 938 ptnet_nm_krings_delete(na_nm); 939 err_mem_finalize: 940 netmap_mem_deref(na_dr->nm_mem, na_dr); 941 942 return ret; 943 } 944 945 /* To be called under core lock. */ 946 static int 947 ptnet_stop(struct ptnet_softc *sc) 948 { 949 if_t ifp = sc->ifp; 950 struct netmap_adapter *na_dr = &sc->ptna->dr.up; 951 struct netmap_adapter *na_nm = &sc->ptna->hwup.up; 952 int i; 953 954 device_printf(sc->dev, "%s\n", __func__); 955 956 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 957 return 0; /* nothing to do */ 958 } 959 960 /* Clear the driver-ready flag, and synchronize with all the queues, 961 * so that after this loop we are sure nobody is working anymore with 962 * the device. This scheme is taken from the vtnet driver. */ 963 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 964 callout_stop(&sc->tick); 965 for (i = 0; i < sc->num_rings; i++) { 966 PTNET_Q_LOCK(sc->queues + i); 967 PTNET_Q_UNLOCK(sc->queues + i); 968 } 969 970 ptnet_nm_register(na_dr, 0 /* off */); 971 972 if (sc->ptna->backend_users == 0) { 973 netmap_mem_rings_delete(na_dr); 974 ptnet_nm_krings_delete(na_nm); 975 } 976 netmap_mem_deref(na_dr->nm_mem, na_dr); 977 978 return 0; 979 } 980 981 static void 982 ptnet_qflush(if_t ifp) 983 { 984 struct ptnet_softc *sc = if_getsoftc(ifp); 985 int i; 986 987 /* Flush all the bufrings and do the interface flush. */ 988 for (i = 0; i < sc->num_rings; i++) { 989 struct ptnet_queue *pq = sc->queues + i; 990 struct mbuf *m; 991 992 PTNET_Q_LOCK(pq); 993 if (pq->bufring) { 994 while ((m = buf_ring_dequeue_sc(pq->bufring))) { 995 m_freem(m); 996 } 997 } 998 PTNET_Q_UNLOCK(pq); 999 } 1000 1001 if_qflush(ifp); 1002 } 1003 1004 static int 1005 ptnet_media_change(if_t ifp) 1006 { 1007 struct ptnet_softc *sc = if_getsoftc(ifp); 1008 struct ifmedia *ifm = &sc->media; 1009 1010 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) { 1011 return EINVAL; 1012 } 1013 1014 return 0; 1015 } 1016 1017 #if __FreeBSD_version >= 1100000 1018 static uint64_t 1019 ptnet_get_counter(if_t ifp, ift_counter cnt) 1020 { 1021 struct ptnet_softc *sc = if_getsoftc(ifp); 1022 struct ptnet_queue_stats stats[2]; 1023 int i; 1024 1025 /* Accumulate statistics over the queues. */ 1026 memset(stats, 0, sizeof(stats)); 1027 for (i = 0; i < sc->num_rings; i++) { 1028 struct ptnet_queue *pq = sc->queues + i; 1029 int idx = (i < sc->num_tx_rings) ? 0 : 1; 1030 1031 stats[idx].packets += pq->stats.packets; 1032 stats[idx].bytes += pq->stats.bytes; 1033 stats[idx].errors += pq->stats.errors; 1034 stats[idx].iqdrops += pq->stats.iqdrops; 1035 stats[idx].mcasts += pq->stats.mcasts; 1036 } 1037 1038 switch (cnt) { 1039 case IFCOUNTER_IPACKETS: 1040 return (stats[1].packets); 1041 case IFCOUNTER_IQDROPS: 1042 return (stats[1].iqdrops); 1043 case IFCOUNTER_IERRORS: 1044 return (stats[1].errors); 1045 case IFCOUNTER_OPACKETS: 1046 return (stats[0].packets); 1047 case IFCOUNTER_OBYTES: 1048 return (stats[0].bytes); 1049 case IFCOUNTER_OMCASTS: 1050 return (stats[0].mcasts); 1051 default: 1052 return (if_get_counter_default(ifp, cnt)); 1053 } 1054 } 1055 #endif 1056 1057 1058 #ifdef PTNETMAP_STATS 1059 /* Called under core lock. */ 1060 static void 1061 ptnet_tick(void *opaque) 1062 { 1063 struct ptnet_softc *sc = opaque; 1064 int i; 1065 1066 for (i = 0; i < sc->num_rings; i++) { 1067 struct ptnet_queue *pq = sc->queues + i; 1068 struct ptnet_queue_stats cur = pq->stats; 1069 struct timeval now; 1070 unsigned int delta; 1071 1072 microtime(&now); 1073 delta = now.tv_usec - sc->last_ts.tv_usec + 1074 (now.tv_sec - sc->last_ts.tv_sec) * 1000000; 1075 delta /= 1000; /* in milliseconds */ 1076 1077 if (delta == 0) 1078 continue; 1079 1080 device_printf(sc->dev, "#%d[%u ms]:pkts %lu, kicks %lu, " 1081 "intr %lu\n", i, delta, 1082 (cur.packets - pq->last_stats.packets), 1083 (cur.kicks - pq->last_stats.kicks), 1084 (cur.intrs - pq->last_stats.intrs)); 1085 pq->last_stats = cur; 1086 } 1087 microtime(&sc->last_ts); 1088 callout_schedule(&sc->tick, hz); 1089 } 1090 #endif /* PTNETMAP_STATS */ 1091 1092 static void 1093 ptnet_media_status(if_t ifp, struct ifmediareq *ifmr) 1094 { 1095 /* We are always active, as the backend netmap port is 1096 * always open in netmap mode. */ 1097 ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE; 1098 ifmr->ifm_active = IFM_ETHER | IFM_10G_T | IFM_FDX; 1099 } 1100 1101 static uint32_t 1102 ptnet_nm_ptctl(struct ptnet_softc *sc, uint32_t cmd) 1103 { 1104 /* 1105 * Write a command and read back error status, 1106 * with zero meaning success. 1107 */ 1108 bus_write_4(sc->iomem, PTNET_IO_PTCTL, cmd); 1109 return bus_read_4(sc->iomem, PTNET_IO_PTCTL); 1110 } 1111 1112 static int 1113 ptnet_nm_config(struct netmap_adapter *na, struct nm_config_info *info) 1114 { 1115 struct ptnet_softc *sc = if_getsoftc(na->ifp); 1116 1117 info->num_tx_rings = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_RINGS); 1118 info->num_rx_rings = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_RINGS); 1119 info->num_tx_descs = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_SLOTS); 1120 info->num_rx_descs = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_SLOTS); 1121 info->rx_buf_maxsize = NETMAP_BUF_SIZE(na); 1122 1123 device_printf(sc->dev, "txr %u, rxr %u, txd %u, rxd %u, rxbufsz %u\n", 1124 info->num_tx_rings, info->num_rx_rings, 1125 info->num_tx_descs, info->num_rx_descs, 1126 info->rx_buf_maxsize); 1127 1128 return 0; 1129 } 1130 1131 static void 1132 ptnet_sync_from_csb(struct ptnet_softc *sc, struct netmap_adapter *na) 1133 { 1134 int i; 1135 1136 /* Sync krings from the host, reading from 1137 * CSB. */ 1138 for (i = 0; i < sc->num_rings; i++) { 1139 struct nm_csb_atok *atok = sc->queues[i].atok; 1140 struct nm_csb_ktoa *ktoa = sc->queues[i].ktoa; 1141 struct netmap_kring *kring; 1142 1143 if (i < na->num_tx_rings) { 1144 kring = na->tx_rings[i]; 1145 } else { 1146 kring = na->rx_rings[i - na->num_tx_rings]; 1147 } 1148 kring->rhead = kring->ring->head = atok->head; 1149 kring->rcur = kring->ring->cur = atok->cur; 1150 kring->nr_hwcur = ktoa->hwcur; 1151 kring->nr_hwtail = kring->rtail = 1152 kring->ring->tail = ktoa->hwtail; 1153 1154 nm_prdis("%d,%d: csb {hc %u h %u c %u ht %u}", t, i, 1155 ktoa->hwcur, atok->head, atok->cur, 1156 ktoa->hwtail); 1157 nm_prdis("%d,%d: kring {hc %u rh %u rc %u h %u c %u ht %u rt %u t %u}", 1158 t, i, kring->nr_hwcur, kring->rhead, kring->rcur, 1159 kring->ring->head, kring->ring->cur, kring->nr_hwtail, 1160 kring->rtail, kring->ring->tail); 1161 } 1162 } 1163 1164 static void 1165 ptnet_update_vnet_hdr(struct ptnet_softc *sc) 1166 { 1167 unsigned int wanted_hdr_len = ptnet_vnet_hdr ? PTNET_HDR_SIZE : 0; 1168 1169 bus_write_4(sc->iomem, PTNET_IO_VNET_HDR_LEN, wanted_hdr_len); 1170 sc->vnet_hdr_len = bus_read_4(sc->iomem, PTNET_IO_VNET_HDR_LEN); 1171 sc->ptna->hwup.up.virt_hdr_len = sc->vnet_hdr_len; 1172 } 1173 1174 static int 1175 ptnet_nm_register(struct netmap_adapter *na, int onoff) 1176 { 1177 /* device-specific */ 1178 if_t ifp = na->ifp; 1179 struct ptnet_softc *sc = if_getsoftc(ifp); 1180 int native = (na == &sc->ptna->hwup.up); 1181 struct ptnet_queue *pq; 1182 int ret = 0; 1183 int i; 1184 1185 if (!onoff) { 1186 sc->ptna->backend_users--; 1187 } 1188 1189 /* If this is the last netmap client, guest interrupt enable flags may 1190 * be in arbitrary state. Since these flags are going to be used also 1191 * by the netdevice driver, we have to make sure to start with 1192 * notifications enabled. Also, schedule NAPI to flush pending packets 1193 * in the RX rings, since we will not receive further interrupts 1194 * until these will be processed. */ 1195 if (native && !onoff && na->active_fds == 0) { 1196 nm_prinf("Exit netmap mode, re-enable interrupts"); 1197 for (i = 0; i < sc->num_rings; i++) { 1198 pq = sc->queues + i; 1199 pq->atok->appl_need_kick = 1; 1200 } 1201 } 1202 1203 if (onoff) { 1204 if (sc->ptna->backend_users == 0) { 1205 /* Initialize notification enable fields in the CSB. */ 1206 for (i = 0; i < sc->num_rings; i++) { 1207 pq = sc->queues + i; 1208 pq->ktoa->kern_need_kick = 1; 1209 pq->atok->appl_need_kick = 1210 (!(ifp->if_capenable & IFCAP_POLLING) 1211 && i >= sc->num_tx_rings); 1212 } 1213 1214 /* Set the virtio-net header length. */ 1215 ptnet_update_vnet_hdr(sc); 1216 1217 /* Make sure the host adapter passed through is ready 1218 * for txsync/rxsync. */ 1219 ret = ptnet_nm_ptctl(sc, PTNETMAP_PTCTL_CREATE); 1220 if (ret) { 1221 return ret; 1222 } 1223 1224 /* Align the guest krings and rings to the state stored 1225 * in the CSB. */ 1226 ptnet_sync_from_csb(sc, na); 1227 } 1228 1229 /* If not native, don't call nm_set_native_flags, since we don't want 1230 * to replace if_transmit method, nor set NAF_NETMAP_ON */ 1231 if (native) { 1232 netmap_krings_mode_commit(na, onoff); 1233 nm_set_native_flags(na); 1234 } 1235 1236 } else { 1237 if (native) { 1238 nm_clear_native_flags(na); 1239 netmap_krings_mode_commit(na, onoff); 1240 } 1241 1242 if (sc->ptna->backend_users == 0) { 1243 ret = ptnet_nm_ptctl(sc, PTNETMAP_PTCTL_DELETE); 1244 } 1245 } 1246 1247 if (onoff) { 1248 sc->ptna->backend_users++; 1249 } 1250 1251 return ret; 1252 } 1253 1254 static int 1255 ptnet_nm_txsync(struct netmap_kring *kring, int flags) 1256 { 1257 struct ptnet_softc *sc = if_getsoftc(kring->na->ifp); 1258 struct ptnet_queue *pq = sc->queues + kring->ring_id; 1259 bool notify; 1260 1261 notify = netmap_pt_guest_txsync(pq->atok, pq->ktoa, kring, flags); 1262 if (notify) { 1263 ptnet_kick(pq); 1264 } 1265 1266 return 0; 1267 } 1268 1269 static int 1270 ptnet_nm_rxsync(struct netmap_kring *kring, int flags) 1271 { 1272 struct ptnet_softc *sc = if_getsoftc(kring->na->ifp); 1273 struct ptnet_queue *pq = sc->rxqueues + kring->ring_id; 1274 bool notify; 1275 1276 notify = netmap_pt_guest_rxsync(pq->atok, pq->ktoa, kring, flags); 1277 if (notify) { 1278 ptnet_kick(pq); 1279 } 1280 1281 return 0; 1282 } 1283 1284 static void 1285 ptnet_nm_intr(struct netmap_adapter *na, int onoff) 1286 { 1287 struct ptnet_softc *sc = if_getsoftc(na->ifp); 1288 int i; 1289 1290 for (i = 0; i < sc->num_rings; i++) { 1291 struct ptnet_queue *pq = sc->queues + i; 1292 pq->atok->appl_need_kick = onoff; 1293 } 1294 } 1295 1296 static void 1297 ptnet_tx_intr(void *opaque) 1298 { 1299 struct ptnet_queue *pq = opaque; 1300 struct ptnet_softc *sc = pq->sc; 1301 1302 DBG(device_printf(sc->dev, "Tx interrupt #%d\n", pq->kring_id)); 1303 #ifdef PTNETMAP_STATS 1304 pq->stats.intrs ++; 1305 #endif /* PTNETMAP_STATS */ 1306 1307 if (netmap_tx_irq(sc->ifp, pq->kring_id) != NM_IRQ_PASS) { 1308 return; 1309 } 1310 1311 /* Schedule the tasqueue to flush process transmissions requests. 1312 * However, vtnet, if_em and if_igb just call ptnet_transmit() here, 1313 * at least when using MSI-X interrupts. The if_em driver, instead 1314 * schedule taskqueue when using legacy interrupts. */ 1315 taskqueue_enqueue(pq->taskq, &pq->task); 1316 } 1317 1318 static void 1319 ptnet_rx_intr(void *opaque) 1320 { 1321 struct ptnet_queue *pq = opaque; 1322 struct ptnet_softc *sc = pq->sc; 1323 unsigned int unused; 1324 1325 DBG(device_printf(sc->dev, "Rx interrupt #%d\n", pq->kring_id)); 1326 #ifdef PTNETMAP_STATS 1327 pq->stats.intrs ++; 1328 #endif /* PTNETMAP_STATS */ 1329 1330 if (netmap_rx_irq(sc->ifp, pq->kring_id, &unused) != NM_IRQ_PASS) { 1331 return; 1332 } 1333 1334 /* Like vtnet, if_igb and if_em drivers when using MSI-X interrupts, 1335 * receive-side processing is executed directly in the interrupt 1336 * service routine. Alternatively, we may schedule the taskqueue. */ 1337 ptnet_rx_eof(pq, PTNET_RX_BUDGET, true); 1338 } 1339 1340 /* The following offloadings-related functions are taken from the vtnet 1341 * driver, but the same functionality is required for the ptnet driver. 1342 * As a temporary solution, I copied this code from vtnet and I started 1343 * to generalize it (taking away driver-specific statistic accounting), 1344 * making as little modifications as possible. 1345 * In the future we need to share these functions between vtnet and ptnet. 1346 */ 1347 static int 1348 ptnet_tx_offload_ctx(struct mbuf *m, int *etype, int *proto, int *start) 1349 { 1350 struct ether_vlan_header *evh; 1351 int offset; 1352 1353 evh = mtod(m, struct ether_vlan_header *); 1354 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 1355 /* BMV: We should handle nested VLAN tags too. */ 1356 *etype = ntohs(evh->evl_proto); 1357 offset = sizeof(struct ether_vlan_header); 1358 } else { 1359 *etype = ntohs(evh->evl_encap_proto); 1360 offset = sizeof(struct ether_header); 1361 } 1362 1363 switch (*etype) { 1364 #if defined(INET) 1365 case ETHERTYPE_IP: { 1366 struct ip *ip, iphdr; 1367 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 1368 m_copydata(m, offset, sizeof(struct ip), 1369 (caddr_t) &iphdr); 1370 ip = &iphdr; 1371 } else 1372 ip = (struct ip *)(m->m_data + offset); 1373 *proto = ip->ip_p; 1374 *start = offset + (ip->ip_hl << 2); 1375 break; 1376 } 1377 #endif 1378 #if defined(INET6) 1379 case ETHERTYPE_IPV6: 1380 *proto = -1; 1381 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 1382 /* Assert the network stack sent us a valid packet. */ 1383 KASSERT(*start > offset, 1384 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 1385 *start, offset, *proto)); 1386 break; 1387 #endif 1388 default: 1389 /* Here we should increment the tx_csum_bad_ethtype counter. */ 1390 return (EINVAL); 1391 } 1392 1393 return (0); 1394 } 1395 1396 static int 1397 ptnet_tx_offload_tso(if_t ifp, struct mbuf *m, int eth_type, 1398 int offset, bool allow_ecn, struct virtio_net_hdr *hdr) 1399 { 1400 static struct timeval lastecn; 1401 static int curecn; 1402 struct tcphdr *tcp, tcphdr; 1403 1404 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 1405 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 1406 tcp = &tcphdr; 1407 } else 1408 tcp = (struct tcphdr *)(m->m_data + offset); 1409 1410 hdr->hdr_len = offset + (tcp->th_off << 2); 1411 hdr->gso_size = m->m_pkthdr.tso_segsz; 1412 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 1413 VIRTIO_NET_HDR_GSO_TCPV6; 1414 1415 if (tcp->th_flags & TH_CWR) { 1416 /* 1417 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In FreeBSD, 1418 * ECN support is not on a per-interface basis, but globally via 1419 * the net.inet.tcp.ecn.enable sysctl knob. The default is off. 1420 */ 1421 if (!allow_ecn) { 1422 if (ppsratecheck(&lastecn, &curecn, 1)) 1423 if_printf(ifp, 1424 "TSO with ECN not negotiated with host\n"); 1425 return (ENOTSUP); 1426 } 1427 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 1428 } 1429 1430 /* Here we should increment tx_tso counter. */ 1431 1432 return (0); 1433 } 1434 1435 static struct mbuf * 1436 ptnet_tx_offload(if_t ifp, struct mbuf *m, bool allow_ecn, 1437 struct virtio_net_hdr *hdr) 1438 { 1439 int flags, etype, csum_start, proto, error; 1440 1441 flags = m->m_pkthdr.csum_flags; 1442 1443 error = ptnet_tx_offload_ctx(m, &etype, &proto, &csum_start); 1444 if (error) 1445 goto drop; 1446 1447 if ((etype == ETHERTYPE_IP && flags & PTNET_CSUM_OFFLOAD) || 1448 (etype == ETHERTYPE_IPV6 && flags & PTNET_CSUM_OFFLOAD_IPV6)) { 1449 /* 1450 * We could compare the IP protocol vs the CSUM_ flag too, 1451 * but that really should not be necessary. 1452 */ 1453 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 1454 hdr->csum_start = csum_start; 1455 hdr->csum_offset = m->m_pkthdr.csum_data; 1456 /* Here we should increment the tx_csum counter. */ 1457 } 1458 1459 if (flags & CSUM_TSO) { 1460 if (__predict_false(proto != IPPROTO_TCP)) { 1461 /* Likely failed to correctly parse the mbuf. 1462 * Here we should increment the tx_tso_not_tcp 1463 * counter. */ 1464 goto drop; 1465 } 1466 1467 KASSERT(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM, 1468 ("%s: mbuf %p TSO without checksum offload %#x", 1469 __func__, m, flags)); 1470 1471 error = ptnet_tx_offload_tso(ifp, m, etype, csum_start, 1472 allow_ecn, hdr); 1473 if (error) 1474 goto drop; 1475 } 1476 1477 return (m); 1478 1479 drop: 1480 m_freem(m); 1481 return (NULL); 1482 } 1483 1484 static void 1485 ptnet_vlan_tag_remove(struct mbuf *m) 1486 { 1487 struct ether_vlan_header *evh; 1488 1489 evh = mtod(m, struct ether_vlan_header *); 1490 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 1491 m->m_flags |= M_VLANTAG; 1492 1493 /* Strip the 802.1Q header. */ 1494 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 1495 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1496 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1497 } 1498 1499 /* 1500 * Use the checksum offset in the VirtIO header to set the 1501 * correct CSUM_* flags. 1502 */ 1503 static int 1504 ptnet_rx_csum_by_offset(struct mbuf *m, uint16_t eth_type, int ip_start, 1505 struct virtio_net_hdr *hdr) 1506 { 1507 #if defined(INET) || defined(INET6) 1508 int offset = hdr->csum_start + hdr->csum_offset; 1509 #endif 1510 1511 /* Only do a basic sanity check on the offset. */ 1512 switch (eth_type) { 1513 #if defined(INET) 1514 case ETHERTYPE_IP: 1515 if (__predict_false(offset < ip_start + sizeof(struct ip))) 1516 return (1); 1517 break; 1518 #endif 1519 #if defined(INET6) 1520 case ETHERTYPE_IPV6: 1521 if (__predict_false(offset < ip_start + sizeof(struct ip6_hdr))) 1522 return (1); 1523 break; 1524 #endif 1525 default: 1526 /* Here we should increment the rx_csum_bad_ethtype counter. */ 1527 return (1); 1528 } 1529 1530 /* 1531 * Use the offset to determine the appropriate CSUM_* flags. This is 1532 * a bit dirty, but we can get by with it since the checksum offsets 1533 * happen to be different. We assume the host host does not do IPv4 1534 * header checksum offloading. 1535 */ 1536 switch (hdr->csum_offset) { 1537 case offsetof(struct udphdr, uh_sum): 1538 case offsetof(struct tcphdr, th_sum): 1539 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1540 m->m_pkthdr.csum_data = 0xFFFF; 1541 break; 1542 case offsetof(struct sctphdr, checksum): 1543 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1544 break; 1545 default: 1546 /* Here we should increment the rx_csum_bad_offset counter. */ 1547 return (1); 1548 } 1549 1550 return (0); 1551 } 1552 1553 static int 1554 ptnet_rx_csum_by_parse(struct mbuf *m, uint16_t eth_type, int ip_start, 1555 struct virtio_net_hdr *hdr) 1556 { 1557 int offset, proto; 1558 1559 switch (eth_type) { 1560 #if defined(INET) 1561 case ETHERTYPE_IP: { 1562 struct ip *ip; 1563 if (__predict_false(m->m_len < ip_start + sizeof(struct ip))) 1564 return (1); 1565 ip = (struct ip *)(m->m_data + ip_start); 1566 proto = ip->ip_p; 1567 offset = ip_start + (ip->ip_hl << 2); 1568 break; 1569 } 1570 #endif 1571 #if defined(INET6) 1572 case ETHERTYPE_IPV6: 1573 if (__predict_false(m->m_len < ip_start + 1574 sizeof(struct ip6_hdr))) 1575 return (1); 1576 offset = ip6_lasthdr(m, ip_start, IPPROTO_IPV6, &proto); 1577 if (__predict_false(offset < 0)) 1578 return (1); 1579 break; 1580 #endif 1581 default: 1582 /* Here we should increment the rx_csum_bad_ethtype counter. */ 1583 return (1); 1584 } 1585 1586 switch (proto) { 1587 case IPPROTO_TCP: 1588 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) 1589 return (1); 1590 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1591 m->m_pkthdr.csum_data = 0xFFFF; 1592 break; 1593 case IPPROTO_UDP: 1594 if (__predict_false(m->m_len < offset + sizeof(struct udphdr))) 1595 return (1); 1596 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1597 m->m_pkthdr.csum_data = 0xFFFF; 1598 break; 1599 case IPPROTO_SCTP: 1600 if (__predict_false(m->m_len < offset + sizeof(struct sctphdr))) 1601 return (1); 1602 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1603 break; 1604 default: 1605 /* 1606 * For the remaining protocols, FreeBSD does not support 1607 * checksum offloading, so the checksum will be recomputed. 1608 */ 1609 #if 0 1610 if_printf(ifp, "cksum offload of unsupported " 1611 "protocol eth_type=%#x proto=%d csum_start=%d " 1612 "csum_offset=%d\n", __func__, eth_type, proto, 1613 hdr->csum_start, hdr->csum_offset); 1614 #endif 1615 break; 1616 } 1617 1618 return (0); 1619 } 1620 1621 /* 1622 * Set the appropriate CSUM_* flags. Unfortunately, the information 1623 * provided is not directly useful to us. The VirtIO header gives the 1624 * offset of the checksum, which is all Linux needs, but this is not 1625 * how FreeBSD does things. We are forced to peek inside the packet 1626 * a bit. 1627 * 1628 * It would be nice if VirtIO gave us the L4 protocol or if FreeBSD 1629 * could accept the offsets and let the stack figure it out. 1630 */ 1631 static int 1632 ptnet_rx_csum(struct mbuf *m, struct virtio_net_hdr *hdr) 1633 { 1634 struct ether_header *eh; 1635 struct ether_vlan_header *evh; 1636 uint16_t eth_type; 1637 int offset, error; 1638 1639 eh = mtod(m, struct ether_header *); 1640 eth_type = ntohs(eh->ether_type); 1641 if (eth_type == ETHERTYPE_VLAN) { 1642 /* BMV: We should handle nested VLAN tags too. */ 1643 evh = mtod(m, struct ether_vlan_header *); 1644 eth_type = ntohs(evh->evl_proto); 1645 offset = sizeof(struct ether_vlan_header); 1646 } else 1647 offset = sizeof(struct ether_header); 1648 1649 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1650 error = ptnet_rx_csum_by_offset(m, eth_type, offset, hdr); 1651 else 1652 error = ptnet_rx_csum_by_parse(m, eth_type, offset, hdr); 1653 1654 return (error); 1655 } 1656 /* End of offloading-related functions to be shared with vtnet. */ 1657 1658 static void 1659 ptnet_ring_update(struct ptnet_queue *pq, struct netmap_kring *kring, 1660 unsigned int head, unsigned int sync_flags) 1661 { 1662 struct netmap_ring *ring = kring->ring; 1663 struct nm_csb_atok *atok = pq->atok; 1664 struct nm_csb_ktoa *ktoa = pq->ktoa; 1665 1666 /* Some packets have been pushed to the netmap ring. We have 1667 * to tell the host to process the new packets, updating cur 1668 * and head in the CSB. */ 1669 ring->head = ring->cur = head; 1670 1671 /* Mimic nm_txsync_prologue/nm_rxsync_prologue. */ 1672 kring->rcur = kring->rhead = head; 1673 1674 nm_sync_kloop_appl_write(atok, kring->rcur, kring->rhead); 1675 1676 /* Kick the host if needed. */ 1677 if (NM_ACCESS_ONCE(ktoa->kern_need_kick)) { 1678 atok->sync_flags = sync_flags; 1679 ptnet_kick(pq); 1680 } 1681 } 1682 1683 #define PTNET_TX_NOSPACE(_h, _k, _min) \ 1684 ((((_h) < (_k)->rtail) ? 0 : (_k)->nkr_num_slots) + \ 1685 (_k)->rtail - (_h)) < (_min) 1686 1687 /* This function may be called by the network stack, or by 1688 * by the taskqueue thread. */ 1689 static int 1690 ptnet_drain_transmit_queue(struct ptnet_queue *pq, unsigned int budget, 1691 bool may_resched) 1692 { 1693 struct ptnet_softc *sc = pq->sc; 1694 bool have_vnet_hdr = sc->vnet_hdr_len; 1695 struct netmap_adapter *na = &sc->ptna->dr.up; 1696 if_t ifp = sc->ifp; 1697 unsigned int batch_count = 0; 1698 struct nm_csb_atok *atok; 1699 struct nm_csb_ktoa *ktoa; 1700 struct netmap_kring *kring; 1701 struct netmap_ring *ring; 1702 struct netmap_slot *slot; 1703 unsigned int count = 0; 1704 unsigned int minspace; 1705 unsigned int head; 1706 unsigned int lim; 1707 struct mbuf *mhead; 1708 struct mbuf *mf; 1709 int nmbuf_bytes; 1710 uint8_t *nmbuf; 1711 1712 if (!PTNET_Q_TRYLOCK(pq)) { 1713 /* We failed to acquire the lock, schedule the taskqueue. */ 1714 nm_prlim(1, "Deferring TX work"); 1715 if (may_resched) { 1716 taskqueue_enqueue(pq->taskq, &pq->task); 1717 } 1718 1719 return 0; 1720 } 1721 1722 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 1723 PTNET_Q_UNLOCK(pq); 1724 nm_prlim(1, "Interface is down"); 1725 return ENETDOWN; 1726 } 1727 1728 atok = pq->atok; 1729 ktoa = pq->ktoa; 1730 kring = na->tx_rings[pq->kring_id]; 1731 ring = kring->ring; 1732 lim = kring->nkr_num_slots - 1; 1733 head = ring->head; 1734 minspace = sc->min_tx_space; 1735 1736 while (count < budget) { 1737 if (PTNET_TX_NOSPACE(head, kring, minspace)) { 1738 /* We ran out of slot, let's see if the host has 1739 * freed up some, by reading hwcur and hwtail from 1740 * the CSB. */ 1741 ptnet_sync_tail(ktoa, kring); 1742 1743 if (PTNET_TX_NOSPACE(head, kring, minspace)) { 1744 /* Still no slots available. Reactivate the 1745 * interrupts so that we can be notified 1746 * when some free slots are made available by 1747 * the host. */ 1748 atok->appl_need_kick = 1; 1749 1750 /* Double check. We need a full barrier to 1751 * prevent the store to atok->appl_need_kick 1752 * to be reordered with the load from 1753 * ktoa->hwcur and ktoa->hwtail (store-load 1754 * barrier). */ 1755 nm_stld_barrier(); 1756 ptnet_sync_tail(ktoa, kring); 1757 if (likely(PTNET_TX_NOSPACE(head, kring, 1758 minspace))) { 1759 break; 1760 } 1761 1762 nm_prlim(1, "Found more slots by doublecheck"); 1763 /* More slots were freed before reactivating 1764 * the interrupts. */ 1765 atok->appl_need_kick = 0; 1766 } 1767 } 1768 1769 mhead = drbr_peek(ifp, pq->bufring); 1770 if (!mhead) { 1771 break; 1772 } 1773 1774 /* Initialize transmission state variables. */ 1775 slot = ring->slot + head; 1776 nmbuf = NMB(na, slot); 1777 nmbuf_bytes = 0; 1778 1779 /* If needed, prepare the virtio-net header at the beginning 1780 * of the first slot. */ 1781 if (have_vnet_hdr) { 1782 struct virtio_net_hdr *vh = 1783 (struct virtio_net_hdr *)nmbuf; 1784 1785 /* For performance, we could replace this memset() with 1786 * two 8-bytes-wide writes. */ 1787 memset(nmbuf, 0, PTNET_HDR_SIZE); 1788 if (mhead->m_pkthdr.csum_flags & PTNET_ALL_OFFLOAD) { 1789 mhead = ptnet_tx_offload(ifp, mhead, false, 1790 vh); 1791 if (unlikely(!mhead)) { 1792 /* Packet dropped because errors 1793 * occurred while preparing the vnet 1794 * header. Let's go ahead with the next 1795 * packet. */ 1796 pq->stats.errors ++; 1797 drbr_advance(ifp, pq->bufring); 1798 continue; 1799 } 1800 } 1801 nm_prdis(1, "%s: [csum_flags %lX] vnet hdr: flags %x " 1802 "csum_start %u csum_ofs %u hdr_len = %u " 1803 "gso_size %u gso_type %x", __func__, 1804 mhead->m_pkthdr.csum_flags, vh->flags, 1805 vh->csum_start, vh->csum_offset, vh->hdr_len, 1806 vh->gso_size, vh->gso_type); 1807 1808 nmbuf += PTNET_HDR_SIZE; 1809 nmbuf_bytes += PTNET_HDR_SIZE; 1810 } 1811 1812 for (mf = mhead; mf; mf = mf->m_next) { 1813 uint8_t *mdata = mf->m_data; 1814 int mlen = mf->m_len; 1815 1816 for (;;) { 1817 int copy = NETMAP_BUF_SIZE(na) - nmbuf_bytes; 1818 1819 if (mlen < copy) { 1820 copy = mlen; 1821 } 1822 memcpy(nmbuf, mdata, copy); 1823 1824 mdata += copy; 1825 mlen -= copy; 1826 nmbuf += copy; 1827 nmbuf_bytes += copy; 1828 1829 if (!mlen) { 1830 break; 1831 } 1832 1833 slot->len = nmbuf_bytes; 1834 slot->flags = NS_MOREFRAG; 1835 1836 head = nm_next(head, lim); 1837 KASSERT(head != ring->tail, 1838 ("Unexpectedly run out of TX space")); 1839 slot = ring->slot + head; 1840 nmbuf = NMB(na, slot); 1841 nmbuf_bytes = 0; 1842 } 1843 } 1844 1845 /* Complete last slot and update head. */ 1846 slot->len = nmbuf_bytes; 1847 slot->flags = 0; 1848 head = nm_next(head, lim); 1849 1850 /* Consume the packet just processed. */ 1851 drbr_advance(ifp, pq->bufring); 1852 1853 /* Copy the packet to listeners. */ 1854 ETHER_BPF_MTAP(ifp, mhead); 1855 1856 pq->stats.packets ++; 1857 pq->stats.bytes += mhead->m_pkthdr.len; 1858 if (mhead->m_flags & M_MCAST) { 1859 pq->stats.mcasts ++; 1860 } 1861 1862 m_freem(mhead); 1863 1864 count ++; 1865 if (++batch_count == PTNET_TX_BATCH) { 1866 ptnet_ring_update(pq, kring, head, NAF_FORCE_RECLAIM); 1867 batch_count = 0; 1868 } 1869 } 1870 1871 if (batch_count) { 1872 ptnet_ring_update(pq, kring, head, NAF_FORCE_RECLAIM); 1873 } 1874 1875 if (count >= budget && may_resched) { 1876 DBG(nm_prlim(1, "out of budget: resched, %d mbufs pending\n", 1877 drbr_inuse(ifp, pq->bufring))); 1878 taskqueue_enqueue(pq->taskq, &pq->task); 1879 } 1880 1881 PTNET_Q_UNLOCK(pq); 1882 1883 return count; 1884 } 1885 1886 static int 1887 ptnet_transmit(if_t ifp, struct mbuf *m) 1888 { 1889 struct ptnet_softc *sc = if_getsoftc(ifp); 1890 struct ptnet_queue *pq; 1891 unsigned int queue_idx; 1892 int err; 1893 1894 DBG(device_printf(sc->dev, "transmit %p\n", m)); 1895 1896 /* Insert 802.1Q header if needed. */ 1897 if (m->m_flags & M_VLANTAG) { 1898 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1899 if (m == NULL) { 1900 return ENOBUFS; 1901 } 1902 m->m_flags &= ~M_VLANTAG; 1903 } 1904 1905 /* Get the flow-id if available. */ 1906 queue_idx = (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) ? 1907 m->m_pkthdr.flowid : curcpu; 1908 1909 if (unlikely(queue_idx >= sc->num_tx_rings)) { 1910 queue_idx %= sc->num_tx_rings; 1911 } 1912 1913 pq = sc->queues + queue_idx; 1914 1915 err = drbr_enqueue(ifp, pq->bufring, m); 1916 if (err) { 1917 /* ENOBUFS when the bufring is full */ 1918 nm_prlim(1, "%s: drbr_enqueue() failed %d\n", 1919 __func__, err); 1920 pq->stats.errors ++; 1921 return err; 1922 } 1923 1924 if (ifp->if_capenable & IFCAP_POLLING) { 1925 /* If polling is on, the transmit queues will be 1926 * drained by the poller. */ 1927 return 0; 1928 } 1929 1930 err = ptnet_drain_transmit_queue(pq, PTNET_TX_BUDGET, true); 1931 1932 return (err < 0) ? err : 0; 1933 } 1934 1935 static unsigned int 1936 ptnet_rx_discard(struct netmap_kring *kring, unsigned int head) 1937 { 1938 struct netmap_ring *ring = kring->ring; 1939 struct netmap_slot *slot = ring->slot + head; 1940 1941 for (;;) { 1942 head = nm_next(head, kring->nkr_num_slots - 1); 1943 if (!(slot->flags & NS_MOREFRAG) || head == ring->tail) { 1944 break; 1945 } 1946 slot = ring->slot + head; 1947 } 1948 1949 return head; 1950 } 1951 1952 static inline struct mbuf * 1953 ptnet_rx_slot(struct mbuf *mtail, uint8_t *nmbuf, unsigned int nmbuf_len) 1954 { 1955 uint8_t *mdata = mtod(mtail, uint8_t *) + mtail->m_len; 1956 1957 do { 1958 unsigned int copy; 1959 1960 if (mtail->m_len == MCLBYTES) { 1961 struct mbuf *mf; 1962 1963 mf = m_getcl(M_NOWAIT, MT_DATA, 0); 1964 if (unlikely(!mf)) { 1965 return NULL; 1966 } 1967 1968 mtail->m_next = mf; 1969 mtail = mf; 1970 mdata = mtod(mtail, uint8_t *); 1971 mtail->m_len = 0; 1972 } 1973 1974 copy = MCLBYTES - mtail->m_len; 1975 if (nmbuf_len < copy) { 1976 copy = nmbuf_len; 1977 } 1978 1979 memcpy(mdata, nmbuf, copy); 1980 1981 nmbuf += copy; 1982 nmbuf_len -= copy; 1983 mdata += copy; 1984 mtail->m_len += copy; 1985 } while (nmbuf_len); 1986 1987 return mtail; 1988 } 1989 1990 static int 1991 ptnet_rx_eof(struct ptnet_queue *pq, unsigned int budget, bool may_resched) 1992 { 1993 struct ptnet_softc *sc = pq->sc; 1994 bool have_vnet_hdr = sc->vnet_hdr_len; 1995 struct nm_csb_atok *atok = pq->atok; 1996 struct nm_csb_ktoa *ktoa = pq->ktoa; 1997 struct netmap_adapter *na = &sc->ptna->dr.up; 1998 struct netmap_kring *kring = na->rx_rings[pq->kring_id]; 1999 struct netmap_ring *ring = kring->ring; 2000 unsigned int const lim = kring->nkr_num_slots - 1; 2001 unsigned int batch_count = 0; 2002 if_t ifp = sc->ifp; 2003 unsigned int count = 0; 2004 uint32_t head; 2005 2006 PTNET_Q_LOCK(pq); 2007 2008 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 2009 goto unlock; 2010 } 2011 2012 kring->nr_kflags &= ~NKR_PENDINTR; 2013 2014 head = ring->head; 2015 while (count < budget) { 2016 uint32_t prev_head = head; 2017 struct mbuf *mhead, *mtail; 2018 struct virtio_net_hdr *vh; 2019 struct netmap_slot *slot; 2020 unsigned int nmbuf_len; 2021 uint8_t *nmbuf; 2022 int deliver = 1; /* the mbuf to the network stack. */ 2023 host_sync: 2024 if (head == ring->tail) { 2025 /* We ran out of slot, let's see if the host has 2026 * added some, by reading hwcur and hwtail from 2027 * the CSB. */ 2028 ptnet_sync_tail(ktoa, kring); 2029 2030 if (head == ring->tail) { 2031 /* Still no slots available. Reactivate 2032 * interrupts as they were disabled by the 2033 * host thread right before issuing the 2034 * last interrupt. */ 2035 atok->appl_need_kick = 1; 2036 2037 /* Double check for more completed RX slots. 2038 * We need a full barrier to prevent the store 2039 * to atok->appl_need_kick to be reordered with 2040 * the load from ktoa->hwcur and ktoa->hwtail 2041 * (store-load barrier). */ 2042 nm_stld_barrier(); 2043 ptnet_sync_tail(ktoa, kring); 2044 if (likely(head == ring->tail)) { 2045 break; 2046 } 2047 atok->appl_need_kick = 0; 2048 } 2049 } 2050 2051 /* Initialize ring state variables, possibly grabbing the 2052 * virtio-net header. */ 2053 slot = ring->slot + head; 2054 nmbuf = NMB(na, slot); 2055 nmbuf_len = slot->len; 2056 2057 vh = (struct virtio_net_hdr *)nmbuf; 2058 if (have_vnet_hdr) { 2059 if (unlikely(nmbuf_len < PTNET_HDR_SIZE)) { 2060 /* There is no good reason why host should 2061 * put the header in multiple netmap slots. 2062 * If this is the case, discard. */ 2063 nm_prlim(1, "Fragmented vnet-hdr: dropping"); 2064 head = ptnet_rx_discard(kring, head); 2065 pq->stats.iqdrops ++; 2066 deliver = 0; 2067 goto skip; 2068 } 2069 nm_prdis(1, "%s: vnet hdr: flags %x csum_start %u " 2070 "csum_ofs %u hdr_len = %u gso_size %u " 2071 "gso_type %x", __func__, vh->flags, 2072 vh->csum_start, vh->csum_offset, vh->hdr_len, 2073 vh->gso_size, vh->gso_type); 2074 nmbuf += PTNET_HDR_SIZE; 2075 nmbuf_len -= PTNET_HDR_SIZE; 2076 } 2077 2078 /* Allocate the head of a new mbuf chain. 2079 * We use m_getcl() to allocate an mbuf with standard cluster 2080 * size (MCLBYTES). In the future we could use m_getjcl() 2081 * to choose different sizes. */ 2082 mhead = mtail = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2083 if (unlikely(mhead == NULL)) { 2084 device_printf(sc->dev, "%s: failed to allocate mbuf " 2085 "head\n", __func__); 2086 pq->stats.errors ++; 2087 break; 2088 } 2089 2090 /* Initialize the mbuf state variables. */ 2091 mhead->m_pkthdr.len = nmbuf_len; 2092 mtail->m_len = 0; 2093 2094 /* Scan all the netmap slots containing the current packet. */ 2095 for (;;) { 2096 DBG(device_printf(sc->dev, "%s: h %u t %u rcv frag " 2097 "len %u, flags %u\n", __func__, 2098 head, ring->tail, slot->len, 2099 slot->flags)); 2100 2101 mtail = ptnet_rx_slot(mtail, nmbuf, nmbuf_len); 2102 if (unlikely(!mtail)) { 2103 /* Ouch. We ran out of memory while processing 2104 * a packet. We have to restore the previous 2105 * head position, free the mbuf chain, and 2106 * schedule the taskqueue to give the packet 2107 * another chance. */ 2108 device_printf(sc->dev, "%s: failed to allocate" 2109 " mbuf frag, reset head %u --> %u\n", 2110 __func__, head, prev_head); 2111 head = prev_head; 2112 m_freem(mhead); 2113 pq->stats.errors ++; 2114 if (may_resched) { 2115 taskqueue_enqueue(pq->taskq, 2116 &pq->task); 2117 } 2118 goto escape; 2119 } 2120 2121 /* We have to increment head irrespective of the 2122 * NS_MOREFRAG being set or not. */ 2123 head = nm_next(head, lim); 2124 2125 if (!(slot->flags & NS_MOREFRAG)) { 2126 break; 2127 } 2128 2129 if (unlikely(head == ring->tail)) { 2130 /* The very last slot prepared by the host has 2131 * the NS_MOREFRAG set. Drop it and continue 2132 * the outer cycle (to do the double-check). */ 2133 nm_prlim(1, "Incomplete packet: dropping"); 2134 m_freem(mhead); 2135 pq->stats.iqdrops ++; 2136 goto host_sync; 2137 } 2138 2139 slot = ring->slot + head; 2140 nmbuf = NMB(na, slot); 2141 nmbuf_len = slot->len; 2142 mhead->m_pkthdr.len += nmbuf_len; 2143 } 2144 2145 mhead->m_pkthdr.rcvif = ifp; 2146 mhead->m_pkthdr.csum_flags = 0; 2147 2148 /* Store the queue idx in the packet header. */ 2149 mhead->m_pkthdr.flowid = pq->kring_id; 2150 M_HASHTYPE_SET(mhead, M_HASHTYPE_OPAQUE); 2151 2152 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 2153 struct ether_header *eh; 2154 2155 eh = mtod(mhead, struct ether_header *); 2156 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2157 ptnet_vlan_tag_remove(mhead); 2158 /* 2159 * With the 802.1Q header removed, update the 2160 * checksum starting location accordingly. 2161 */ 2162 if (vh->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2163 vh->csum_start -= ETHER_VLAN_ENCAP_LEN; 2164 } 2165 } 2166 2167 if (have_vnet_hdr && (vh->flags & (VIRTIO_NET_HDR_F_NEEDS_CSUM 2168 | VIRTIO_NET_HDR_F_DATA_VALID))) { 2169 if (unlikely(ptnet_rx_csum(mhead, vh))) { 2170 m_freem(mhead); 2171 nm_prlim(1, "Csum offload error: dropping"); 2172 pq->stats.iqdrops ++; 2173 deliver = 0; 2174 } 2175 } 2176 2177 skip: 2178 count ++; 2179 if (++batch_count >= PTNET_RX_BATCH) { 2180 /* Some packets have been (or will be) pushed to the network 2181 * stack. We need to update the CSB to tell the host about 2182 * the new ring->cur and ring->head (RX buffer refill). */ 2183 ptnet_ring_update(pq, kring, head, NAF_FORCE_READ); 2184 batch_count = 0; 2185 } 2186 2187 if (likely(deliver)) { 2188 pq->stats.packets ++; 2189 pq->stats.bytes += mhead->m_pkthdr.len; 2190 2191 PTNET_Q_UNLOCK(pq); 2192 (*ifp->if_input)(ifp, mhead); 2193 PTNET_Q_LOCK(pq); 2194 /* The ring->head index (and related indices) are 2195 * updated under pq lock by ptnet_ring_update(). 2196 * Since we dropped the lock to call if_input(), we 2197 * must reload ring->head and restart processing the 2198 * ring from there. */ 2199 head = ring->head; 2200 2201 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 2202 /* The interface has gone down while we didn't 2203 * have the lock. Stop any processing and exit. */ 2204 goto unlock; 2205 } 2206 } 2207 } 2208 escape: 2209 if (batch_count) { 2210 ptnet_ring_update(pq, kring, head, NAF_FORCE_READ); 2211 2212 } 2213 2214 if (count >= budget && may_resched) { 2215 /* If we ran out of budget or the double-check found new 2216 * slots to process, schedule the taskqueue. */ 2217 DBG(nm_prlim(1, "out of budget: resched h %u t %u\n", 2218 head, ring->tail)); 2219 taskqueue_enqueue(pq->taskq, &pq->task); 2220 } 2221 unlock: 2222 PTNET_Q_UNLOCK(pq); 2223 2224 return count; 2225 } 2226 2227 static void 2228 ptnet_rx_task(void *context, int pending) 2229 { 2230 struct ptnet_queue *pq = context; 2231 2232 DBG(nm_prlim(1, "%s: pq #%u\n", __func__, pq->kring_id)); 2233 ptnet_rx_eof(pq, PTNET_RX_BUDGET, true); 2234 } 2235 2236 static void 2237 ptnet_tx_task(void *context, int pending) 2238 { 2239 struct ptnet_queue *pq = context; 2240 2241 DBG(nm_prlim(1, "%s: pq #%u\n", __func__, pq->kring_id)); 2242 ptnet_drain_transmit_queue(pq, PTNET_TX_BUDGET, true); 2243 } 2244 2245 #ifdef DEVICE_POLLING 2246 /* We don't need to handle differently POLL_AND_CHECK_STATUS and 2247 * POLL_ONLY, since we don't have an Interrupt Status Register. */ 2248 static int 2249 ptnet_poll(if_t ifp, enum poll_cmd cmd, int budget) 2250 { 2251 struct ptnet_softc *sc = if_getsoftc(ifp); 2252 unsigned int queue_budget; 2253 unsigned int count = 0; 2254 bool borrow = false; 2255 int i; 2256 2257 KASSERT(sc->num_rings > 0, ("Found no queues in while polling ptnet")); 2258 queue_budget = MAX(budget / sc->num_rings, 1); 2259 nm_prlim(1, "Per-queue budget is %d", queue_budget); 2260 2261 while (budget) { 2262 unsigned int rcnt = 0; 2263 2264 for (i = 0; i < sc->num_rings; i++) { 2265 struct ptnet_queue *pq = sc->queues + i; 2266 2267 if (borrow) { 2268 queue_budget = MIN(queue_budget, budget); 2269 if (queue_budget == 0) { 2270 break; 2271 } 2272 } 2273 2274 if (i < sc->num_tx_rings) { 2275 rcnt += ptnet_drain_transmit_queue(pq, 2276 queue_budget, false); 2277 } else { 2278 rcnt += ptnet_rx_eof(pq, queue_budget, 2279 false); 2280 } 2281 } 2282 2283 if (!rcnt) { 2284 /* A scan of the queues gave no result, we can 2285 * stop here. */ 2286 break; 2287 } 2288 2289 if (rcnt > budget) { 2290 /* This may happen when initial budget < sc->num_rings, 2291 * since one packet budget is given to each queue 2292 * anyway. Just pretend we didn't eat "so much". */ 2293 rcnt = budget; 2294 } 2295 count += rcnt; 2296 budget -= rcnt; 2297 borrow = true; 2298 } 2299 2300 2301 return count; 2302 } 2303 #endif /* DEVICE_POLLING */ 2304