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 ptnet_csb_gh *ptgh; 132 struct ptnet_csb_hg *pthg; 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 ptnet_csb_gh *csb_gh; 170 struct ptnet_csb_hg *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(if_t ifp, uint32_t cmd); 213 static int ptnet_nm_config(struct netmap_adapter *na, unsigned *txr, 214 unsigned *txd, unsigned *rxr, unsigned *rxd); 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 ptnet_csb_gh) > 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 ptnet_csb_hg *)(((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->ptgh = sc->csb_gh + i; 383 pq->pthg = 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 static int 509 ptnet_detach(device_t dev) 510 { 511 struct ptnet_softc *sc = device_get_softc(dev); 512 int i; 513 514 #ifdef DEVICE_POLLING 515 if (sc->ifp->if_capenable & IFCAP_POLLING) { 516 ether_poll_deregister(sc->ifp); 517 } 518 #endif 519 callout_drain(&sc->tick); 520 521 if (sc->queues) { 522 /* Drain taskqueues before calling if_detach. */ 523 for (i = 0; i < sc->num_rings; i++) { 524 struct ptnet_queue *pq = sc->queues + i; 525 526 if (pq->taskq) { 527 taskqueue_drain(pq->taskq, &pq->task); 528 } 529 } 530 } 531 532 if (sc->ifp) { 533 ether_ifdetach(sc->ifp); 534 535 /* Uninitialize netmap adapters for this device. */ 536 netmap_detach(sc->ifp); 537 538 ifmedia_removeall(&sc->media); 539 if_free(sc->ifp); 540 sc->ifp = NULL; 541 } 542 543 ptnet_irqs_fini(sc); 544 545 if (sc->csb_gh) { 546 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAH, 0); 547 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAL, 0); 548 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAH, 0); 549 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAL, 0); 550 contigfree(sc->csb_gh, 2*PAGE_SIZE, M_DEVBUF); 551 sc->csb_gh = NULL; 552 sc->csb_hg = NULL; 553 } 554 555 if (sc->queues) { 556 for (i = 0; i < sc->num_rings; i++) { 557 struct ptnet_queue *pq = sc->queues + i; 558 559 if (mtx_initialized(&pq->lock)) { 560 mtx_destroy(&pq->lock); 561 } 562 if (pq->bufring != NULL) { 563 buf_ring_free(pq->bufring, M_DEVBUF); 564 } 565 } 566 free(sc->queues, M_DEVBUF); 567 sc->queues = NULL; 568 } 569 570 if (sc->iomem) { 571 bus_release_resource(dev, SYS_RES_IOPORT, 572 PCIR_BAR(PTNETMAP_IO_PCI_BAR), sc->iomem); 573 sc->iomem = NULL; 574 } 575 576 mtx_destroy(&sc->lock); 577 578 device_printf(dev, "%s() completed\n", __func__); 579 580 return (0); 581 } 582 583 static int 584 ptnet_suspend(device_t dev) 585 { 586 struct ptnet_softc *sc; 587 588 sc = device_get_softc(dev); 589 (void)sc; 590 591 return (0); 592 } 593 594 static int 595 ptnet_resume(device_t dev) 596 { 597 struct ptnet_softc *sc; 598 599 sc = device_get_softc(dev); 600 (void)sc; 601 602 return (0); 603 } 604 605 static int 606 ptnet_shutdown(device_t dev) 607 { 608 /* 609 * Suspend already does all of what we need to 610 * do here; we just never expect to be resumed. 611 */ 612 return (ptnet_suspend(dev)); 613 } 614 615 static int 616 ptnet_irqs_init(struct ptnet_softc *sc) 617 { 618 int rid = PCIR_BAR(PTNETMAP_MSIX_PCI_BAR); 619 int nvecs = sc->num_rings; 620 device_t dev = sc->dev; 621 int err = ENOSPC; 622 int cpu_cur; 623 int i; 624 625 if (pci_find_cap(dev, PCIY_MSIX, NULL) != 0) { 626 device_printf(dev, "Could not find MSI-X capability\n"); 627 return (ENXIO); 628 } 629 630 sc->msix_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 631 &rid, RF_ACTIVE); 632 if (sc->msix_mem == NULL) { 633 device_printf(dev, "Failed to allocate MSIX PCI BAR\n"); 634 return (ENXIO); 635 } 636 637 if (pci_msix_count(dev) < nvecs) { 638 device_printf(dev, "Not enough MSI-X vectors\n"); 639 goto err_path; 640 } 641 642 err = pci_alloc_msix(dev, &nvecs); 643 if (err) { 644 device_printf(dev, "Failed to allocate MSI-X vectors\n"); 645 goto err_path; 646 } 647 648 for (i = 0; i < nvecs; i++) { 649 struct ptnet_queue *pq = sc->queues + i; 650 651 rid = i + 1; 652 pq->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 653 RF_ACTIVE); 654 if (pq->irq == NULL) { 655 device_printf(dev, "Failed to allocate interrupt " 656 "for queue #%d\n", i); 657 err = ENOSPC; 658 goto err_path; 659 } 660 } 661 662 cpu_cur = CPU_FIRST(); 663 for (i = 0; i < nvecs; i++) { 664 struct ptnet_queue *pq = sc->queues + i; 665 void (*handler)(void *) = ptnet_tx_intr; 666 667 if (i >= sc->num_tx_rings) { 668 handler = ptnet_rx_intr; 669 } 670 err = bus_setup_intr(dev, pq->irq, INTR_TYPE_NET | INTR_MPSAFE, 671 NULL /* intr_filter */, handler, 672 pq, &pq->cookie); 673 if (err) { 674 device_printf(dev, "Failed to register intr handler " 675 "for queue #%d\n", i); 676 goto err_path; 677 } 678 679 bus_describe_intr(dev, pq->irq, pq->cookie, "q%d", i); 680 #if 0 681 bus_bind_intr(sc->dev, pq->irq, cpu_cur); 682 #endif 683 cpu_cur = CPU_NEXT(cpu_cur); 684 } 685 686 device_printf(dev, "Allocated %d MSI-X vectors\n", nvecs); 687 688 cpu_cur = CPU_FIRST(); 689 for (i = 0; i < nvecs; i++) { 690 struct ptnet_queue *pq = sc->queues + i; 691 static void (*handler)(void *context, int pending); 692 693 handler = (i < sc->num_tx_rings) ? ptnet_tx_task : ptnet_rx_task; 694 695 TASK_INIT(&pq->task, 0, handler, pq); 696 pq->taskq = taskqueue_create_fast("ptnet_queue", M_NOWAIT, 697 taskqueue_thread_enqueue, &pq->taskq); 698 taskqueue_start_threads(&pq->taskq, 1, PI_NET, "%s-pq-%d", 699 device_get_nameunit(sc->dev), cpu_cur); 700 cpu_cur = CPU_NEXT(cpu_cur); 701 } 702 703 return 0; 704 err_path: 705 ptnet_irqs_fini(sc); 706 return err; 707 } 708 709 static void 710 ptnet_irqs_fini(struct ptnet_softc *sc) 711 { 712 device_t dev = sc->dev; 713 int i; 714 715 for (i = 0; i < sc->num_rings; i++) { 716 struct ptnet_queue *pq = sc->queues + i; 717 718 if (pq->taskq) { 719 taskqueue_free(pq->taskq); 720 pq->taskq = NULL; 721 } 722 723 if (pq->cookie) { 724 bus_teardown_intr(dev, pq->irq, pq->cookie); 725 pq->cookie = NULL; 726 } 727 728 if (pq->irq) { 729 bus_release_resource(dev, SYS_RES_IRQ, i + 1, pq->irq); 730 pq->irq = NULL; 731 } 732 } 733 734 if (sc->msix_mem) { 735 pci_release_msi(dev); 736 737 bus_release_resource(dev, SYS_RES_MEMORY, 738 PCIR_BAR(PTNETMAP_MSIX_PCI_BAR), 739 sc->msix_mem); 740 sc->msix_mem = NULL; 741 } 742 } 743 744 static void 745 ptnet_init(void *opaque) 746 { 747 struct ptnet_softc *sc = opaque; 748 749 PTNET_CORE_LOCK(sc); 750 ptnet_init_locked(sc); 751 PTNET_CORE_UNLOCK(sc); 752 } 753 754 static int 755 ptnet_ioctl(if_t ifp, u_long cmd, caddr_t data) 756 { 757 struct ptnet_softc *sc = if_getsoftc(ifp); 758 device_t dev = sc->dev; 759 struct ifreq *ifr = (struct ifreq *)data; 760 int mask, err = 0; 761 762 switch (cmd) { 763 case SIOCSIFFLAGS: 764 device_printf(dev, "SIOCSIFFLAGS %x\n", ifp->if_flags); 765 PTNET_CORE_LOCK(sc); 766 if (ifp->if_flags & IFF_UP) { 767 /* Network stack wants the iff to be up. */ 768 err = ptnet_init_locked(sc); 769 } else { 770 /* Network stack wants the iff to be down. */ 771 err = ptnet_stop(sc); 772 } 773 /* We don't need to do nothing to support IFF_PROMISC, 774 * since that is managed by the backend port. */ 775 PTNET_CORE_UNLOCK(sc); 776 break; 777 778 case SIOCSIFCAP: 779 device_printf(dev, "SIOCSIFCAP %x %x\n", 780 ifr->ifr_reqcap, ifp->if_capenable); 781 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 782 #ifdef DEVICE_POLLING 783 if (mask & IFCAP_POLLING) { 784 struct ptnet_queue *pq; 785 int i; 786 787 if (ifr->ifr_reqcap & IFCAP_POLLING) { 788 err = ether_poll_register(ptnet_poll, ifp); 789 if (err) { 790 break; 791 } 792 /* Stop queues and sync with taskqueues. */ 793 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 794 for (i = 0; i < sc->num_rings; i++) { 795 pq = sc-> queues + i; 796 /* Make sure the worker sees the 797 * IFF_DRV_RUNNING down. */ 798 PTNET_Q_LOCK(pq); 799 pq->ptgh->guest_need_kick = 0; 800 PTNET_Q_UNLOCK(pq); 801 /* Wait for rescheduling to finish. */ 802 if (pq->taskq) { 803 taskqueue_drain(pq->taskq, 804 &pq->task); 805 } 806 } 807 ifp->if_drv_flags |= IFF_DRV_RUNNING; 808 } else { 809 err = ether_poll_deregister(ifp); 810 for (i = 0; i < sc->num_rings; i++) { 811 pq = sc-> queues + i; 812 PTNET_Q_LOCK(pq); 813 pq->ptgh->guest_need_kick = 1; 814 PTNET_Q_UNLOCK(pq); 815 } 816 } 817 } 818 #endif /* DEVICE_POLLING */ 819 ifp->if_capenable = ifr->ifr_reqcap; 820 break; 821 822 case SIOCSIFMTU: 823 /* We support any reasonable MTU. */ 824 if (ifr->ifr_mtu < ETHERMIN || 825 ifr->ifr_mtu > PTNET_MAX_PKT_SIZE) { 826 err = EINVAL; 827 } else { 828 PTNET_CORE_LOCK(sc); 829 ifp->if_mtu = ifr->ifr_mtu; 830 PTNET_CORE_UNLOCK(sc); 831 } 832 break; 833 834 case SIOCSIFMEDIA: 835 case SIOCGIFMEDIA: 836 err = ifmedia_ioctl(ifp, ifr, &sc->media, cmd); 837 break; 838 839 default: 840 err = ether_ioctl(ifp, cmd, data); 841 break; 842 } 843 844 return err; 845 } 846 847 static int 848 ptnet_init_locked(struct ptnet_softc *sc) 849 { 850 if_t ifp = sc->ifp; 851 struct netmap_adapter *na_dr = &sc->ptna->dr.up; 852 struct netmap_adapter *na_nm = &sc->ptna->hwup.up; 853 unsigned int nm_buf_size; 854 int ret; 855 856 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 857 return 0; /* nothing to do */ 858 } 859 860 device_printf(sc->dev, "%s\n", __func__); 861 862 /* Translate offload capabilities according to if_capenable. */ 863 ifp->if_hwassist = 0; 864 if (ifp->if_capenable & IFCAP_TXCSUM) 865 ifp->if_hwassist |= PTNET_CSUM_OFFLOAD; 866 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) 867 ifp->if_hwassist |= PTNET_CSUM_OFFLOAD_IPV6; 868 if (ifp->if_capenable & IFCAP_TSO4) 869 ifp->if_hwassist |= CSUM_IP_TSO; 870 if (ifp->if_capenable & IFCAP_TSO6) 871 ifp->if_hwassist |= CSUM_IP6_TSO; 872 873 /* 874 * Prepare the interface for netmap mode access. 875 */ 876 netmap_update_config(na_dr); 877 878 ret = netmap_mem_finalize(na_dr->nm_mem, na_dr); 879 if (ret) { 880 device_printf(sc->dev, "netmap_mem_finalize() failed\n"); 881 return ret; 882 } 883 884 if (sc->ptna->backend_regifs == 0) { 885 ret = ptnet_nm_krings_create(na_nm); 886 if (ret) { 887 device_printf(sc->dev, "ptnet_nm_krings_create() " 888 "failed\n"); 889 goto err_mem_finalize; 890 } 891 892 ret = netmap_mem_rings_create(na_dr); 893 if (ret) { 894 device_printf(sc->dev, "netmap_mem_rings_create() " 895 "failed\n"); 896 goto err_rings_create; 897 } 898 899 ret = netmap_mem_get_lut(na_dr->nm_mem, &na_dr->na_lut); 900 if (ret) { 901 device_printf(sc->dev, "netmap_mem_get_lut() " 902 "failed\n"); 903 goto err_get_lut; 904 } 905 } 906 907 ret = ptnet_nm_register(na_dr, 1 /* on */); 908 if (ret) { 909 goto err_register; 910 } 911 912 nm_buf_size = NETMAP_BUF_SIZE(na_dr); 913 914 KASSERT(nm_buf_size > 0, ("Invalid netmap buffer size")); 915 sc->min_tx_space = PTNET_MAX_PKT_SIZE / nm_buf_size + 2; 916 device_printf(sc->dev, "%s: min_tx_space = %u\n", __func__, 917 sc->min_tx_space); 918 #ifdef PTNETMAP_STATS 919 callout_reset(&sc->tick, hz, ptnet_tick, sc); 920 #endif 921 922 ifp->if_drv_flags |= IFF_DRV_RUNNING; 923 924 return 0; 925 926 err_register: 927 memset(&na_dr->na_lut, 0, sizeof(na_dr->na_lut)); 928 err_get_lut: 929 netmap_mem_rings_delete(na_dr); 930 err_rings_create: 931 ptnet_nm_krings_delete(na_nm); 932 err_mem_finalize: 933 netmap_mem_deref(na_dr->nm_mem, na_dr); 934 935 return ret; 936 } 937 938 /* To be called under core lock. */ 939 static int 940 ptnet_stop(struct ptnet_softc *sc) 941 { 942 if_t ifp = sc->ifp; 943 struct netmap_adapter *na_dr = &sc->ptna->dr.up; 944 struct netmap_adapter *na_nm = &sc->ptna->hwup.up; 945 int i; 946 947 device_printf(sc->dev, "%s\n", __func__); 948 949 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 950 return 0; /* nothing to do */ 951 } 952 953 /* Clear the driver-ready flag, and synchronize with all the queues, 954 * so that after this loop we are sure nobody is working anymore with 955 * the device. This scheme is taken from the vtnet driver. */ 956 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 957 callout_stop(&sc->tick); 958 for (i = 0; i < sc->num_rings; i++) { 959 PTNET_Q_LOCK(sc->queues + i); 960 PTNET_Q_UNLOCK(sc->queues + i); 961 } 962 963 ptnet_nm_register(na_dr, 0 /* off */); 964 965 if (sc->ptna->backend_regifs == 0) { 966 netmap_mem_rings_delete(na_dr); 967 ptnet_nm_krings_delete(na_nm); 968 } 969 netmap_mem_deref(na_dr->nm_mem, na_dr); 970 971 return 0; 972 } 973 974 static void 975 ptnet_qflush(if_t ifp) 976 { 977 struct ptnet_softc *sc = if_getsoftc(ifp); 978 int i; 979 980 /* Flush all the bufrings and do the interface flush. */ 981 for (i = 0; i < sc->num_rings; i++) { 982 struct ptnet_queue *pq = sc->queues + i; 983 struct mbuf *m; 984 985 PTNET_Q_LOCK(pq); 986 if (pq->bufring) { 987 while ((m = buf_ring_dequeue_sc(pq->bufring))) { 988 m_freem(m); 989 } 990 } 991 PTNET_Q_UNLOCK(pq); 992 } 993 994 if_qflush(ifp); 995 } 996 997 static int 998 ptnet_media_change(if_t ifp) 999 { 1000 struct ptnet_softc *sc = if_getsoftc(ifp); 1001 struct ifmedia *ifm = &sc->media; 1002 1003 if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER) { 1004 return EINVAL; 1005 } 1006 1007 return 0; 1008 } 1009 1010 #if __FreeBSD_version >= 1100000 1011 static uint64_t 1012 ptnet_get_counter(if_t ifp, ift_counter cnt) 1013 { 1014 struct ptnet_softc *sc = if_getsoftc(ifp); 1015 struct ptnet_queue_stats stats[2]; 1016 int i; 1017 1018 /* Accumulate statistics over the queues. */ 1019 memset(stats, 0, sizeof(stats)); 1020 for (i = 0; i < sc->num_rings; i++) { 1021 struct ptnet_queue *pq = sc->queues + i; 1022 int idx = (i < sc->num_tx_rings) ? 0 : 1; 1023 1024 stats[idx].packets += pq->stats.packets; 1025 stats[idx].bytes += pq->stats.bytes; 1026 stats[idx].errors += pq->stats.errors; 1027 stats[idx].iqdrops += pq->stats.iqdrops; 1028 stats[idx].mcasts += pq->stats.mcasts; 1029 } 1030 1031 switch (cnt) { 1032 case IFCOUNTER_IPACKETS: 1033 return (stats[1].packets); 1034 case IFCOUNTER_IQDROPS: 1035 return (stats[1].iqdrops); 1036 case IFCOUNTER_IERRORS: 1037 return (stats[1].errors); 1038 case IFCOUNTER_OPACKETS: 1039 return (stats[0].packets); 1040 case IFCOUNTER_OBYTES: 1041 return (stats[0].bytes); 1042 case IFCOUNTER_OMCASTS: 1043 return (stats[0].mcasts); 1044 default: 1045 return (if_get_counter_default(ifp, cnt)); 1046 } 1047 } 1048 #endif 1049 1050 1051 #ifdef PTNETMAP_STATS 1052 /* Called under core lock. */ 1053 static void 1054 ptnet_tick(void *opaque) 1055 { 1056 struct ptnet_softc *sc = opaque; 1057 int i; 1058 1059 for (i = 0; i < sc->num_rings; i++) { 1060 struct ptnet_queue *pq = sc->queues + i; 1061 struct ptnet_queue_stats cur = pq->stats; 1062 struct timeval now; 1063 unsigned int delta; 1064 1065 microtime(&now); 1066 delta = now.tv_usec - sc->last_ts.tv_usec + 1067 (now.tv_sec - sc->last_ts.tv_sec) * 1000000; 1068 delta /= 1000; /* in milliseconds */ 1069 1070 if (delta == 0) 1071 continue; 1072 1073 device_printf(sc->dev, "#%d[%u ms]:pkts %lu, kicks %lu, " 1074 "intr %lu\n", i, delta, 1075 (cur.packets - pq->last_stats.packets), 1076 (cur.kicks - pq->last_stats.kicks), 1077 (cur.intrs - pq->last_stats.intrs)); 1078 pq->last_stats = cur; 1079 } 1080 microtime(&sc->last_ts); 1081 callout_schedule(&sc->tick, hz); 1082 } 1083 #endif /* PTNETMAP_STATS */ 1084 1085 static void 1086 ptnet_media_status(if_t ifp, struct ifmediareq *ifmr) 1087 { 1088 /* We are always active, as the backend netmap port is 1089 * always open in netmap mode. */ 1090 ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE; 1091 ifmr->ifm_active = IFM_ETHER | IFM_10G_T | IFM_FDX; 1092 } 1093 1094 static uint32_t 1095 ptnet_nm_ptctl(if_t ifp, uint32_t cmd) 1096 { 1097 struct ptnet_softc *sc = if_getsoftc(ifp); 1098 /* 1099 * Write a command and read back error status, 1100 * with zero meaning success. 1101 */ 1102 bus_write_4(sc->iomem, PTNET_IO_PTCTL, cmd); 1103 return bus_read_4(sc->iomem, PTNET_IO_PTCTL); 1104 } 1105 1106 static int 1107 ptnet_nm_config(struct netmap_adapter *na, unsigned *txr, unsigned *txd, 1108 unsigned *rxr, unsigned *rxd) 1109 { 1110 struct ptnet_softc *sc = if_getsoftc(na->ifp); 1111 1112 *txr = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_RINGS); 1113 *rxr = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_RINGS); 1114 *txd = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_SLOTS); 1115 *rxd = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_SLOTS); 1116 1117 device_printf(sc->dev, "txr %u, rxr %u, txd %u, rxd %u\n", 1118 *txr, *rxr, *txd, *rxd); 1119 1120 return 0; 1121 } 1122 1123 static void 1124 ptnet_sync_from_csb(struct ptnet_softc *sc, struct netmap_adapter *na) 1125 { 1126 int i; 1127 1128 /* Sync krings from the host, reading from 1129 * CSB. */ 1130 for (i = 0; i < sc->num_rings; i++) { 1131 struct ptnet_csb_gh *ptgh = sc->queues[i].ptgh; 1132 struct ptnet_csb_hg *pthg = sc->queues[i].pthg; 1133 struct netmap_kring *kring; 1134 1135 if (i < na->num_tx_rings) { 1136 kring = na->tx_rings + i; 1137 } else { 1138 kring = na->rx_rings + i - na->num_tx_rings; 1139 } 1140 kring->rhead = kring->ring->head = ptgh->head; 1141 kring->rcur = kring->ring->cur = ptgh->cur; 1142 kring->nr_hwcur = pthg->hwcur; 1143 kring->nr_hwtail = kring->rtail = 1144 kring->ring->tail = pthg->hwtail; 1145 1146 ND("%d,%d: csb {hc %u h %u c %u ht %u}", t, i, 1147 pthg->hwcur, ptgh->head, ptgh->cur, 1148 pthg->hwtail); 1149 ND("%d,%d: kring {hc %u rh %u rc %u h %u c %u ht %u rt %u t %u}", 1150 t, i, kring->nr_hwcur, kring->rhead, kring->rcur, 1151 kring->ring->head, kring->ring->cur, kring->nr_hwtail, 1152 kring->rtail, kring->ring->tail); 1153 } 1154 } 1155 1156 static void 1157 ptnet_update_vnet_hdr(struct ptnet_softc *sc) 1158 { 1159 unsigned int wanted_hdr_len = ptnet_vnet_hdr ? PTNET_HDR_SIZE : 0; 1160 1161 bus_write_4(sc->iomem, PTNET_IO_VNET_HDR_LEN, wanted_hdr_len); 1162 sc->vnet_hdr_len = bus_read_4(sc->iomem, PTNET_IO_VNET_HDR_LEN); 1163 sc->ptna->hwup.up.virt_hdr_len = sc->vnet_hdr_len; 1164 } 1165 1166 static int 1167 ptnet_nm_register(struct netmap_adapter *na, int onoff) 1168 { 1169 /* device-specific */ 1170 if_t ifp = na->ifp; 1171 struct ptnet_softc *sc = if_getsoftc(ifp); 1172 int native = (na == &sc->ptna->hwup.up); 1173 struct ptnet_queue *pq; 1174 enum txrx t; 1175 int ret = 0; 1176 int i; 1177 1178 if (!onoff) { 1179 sc->ptna->backend_regifs--; 1180 } 1181 1182 /* If this is the last netmap client, guest interrupt enable flags may 1183 * be in arbitrary state. Since these flags are going to be used also 1184 * by the netdevice driver, we have to make sure to start with 1185 * notifications enabled. Also, schedule NAPI to flush pending packets 1186 * in the RX rings, since we will not receive further interrupts 1187 * until these will be processed. */ 1188 if (native && !onoff && na->active_fds == 0) { 1189 D("Exit netmap mode, re-enable interrupts"); 1190 for (i = 0; i < sc->num_rings; i++) { 1191 pq = sc->queues + i; 1192 pq->ptgh->guest_need_kick = 1; 1193 } 1194 } 1195 1196 if (onoff) { 1197 if (sc->ptna->backend_regifs == 0) { 1198 /* Initialize notification enable fields in the CSB. */ 1199 for (i = 0; i < sc->num_rings; i++) { 1200 pq = sc->queues + i; 1201 pq->pthg->host_need_kick = 1; 1202 pq->ptgh->guest_need_kick = 1203 (!(ifp->if_capenable & IFCAP_POLLING) 1204 && i >= sc->num_tx_rings); 1205 } 1206 1207 /* Set the virtio-net header length. */ 1208 ptnet_update_vnet_hdr(sc); 1209 1210 /* Make sure the host adapter passed through is ready 1211 * for txsync/rxsync. */ 1212 ret = ptnet_nm_ptctl(ifp, PTNETMAP_PTCTL_CREATE); 1213 if (ret) { 1214 return ret; 1215 } 1216 } 1217 1218 /* Sync from CSB must be done after REGIF PTCTL. Skip this 1219 * step only if this is a netmap client and it is not the 1220 * first one. */ 1221 if ((!native && sc->ptna->backend_regifs == 0) || 1222 (native && na->active_fds == 0)) { 1223 ptnet_sync_from_csb(sc, na); 1224 } 1225 1226 /* If not native, don't call nm_set_native_flags, since we don't want 1227 * to replace if_transmit method, nor set NAF_NETMAP_ON */ 1228 if (native) { 1229 for_rx_tx(t) { 1230 for (i = 0; i <= nma_get_nrings(na, t); i++) { 1231 struct netmap_kring *kring = &NMR(na, t)[i]; 1232 1233 if (nm_kring_pending_on(kring)) { 1234 kring->nr_mode = NKR_NETMAP_ON; 1235 } 1236 } 1237 } 1238 nm_set_native_flags(na); 1239 } 1240 1241 } else { 1242 if (native) { 1243 nm_clear_native_flags(na); 1244 for_rx_tx(t) { 1245 for (i = 0; i <= nma_get_nrings(na, t); i++) { 1246 struct netmap_kring *kring = &NMR(na, t)[i]; 1247 1248 if (nm_kring_pending_off(kring)) { 1249 kring->nr_mode = NKR_NETMAP_OFF; 1250 } 1251 } 1252 } 1253 } 1254 1255 /* Sync from CSB must be done before UNREGIF PTCTL, on the last 1256 * netmap client. */ 1257 if (native && na->active_fds == 0) { 1258 ptnet_sync_from_csb(sc, na); 1259 } 1260 1261 if (sc->ptna->backend_regifs == 0) { 1262 ret = ptnet_nm_ptctl(ifp, PTNETMAP_PTCTL_DELETE); 1263 } 1264 } 1265 1266 if (onoff) { 1267 sc->ptna->backend_regifs++; 1268 } 1269 1270 return ret; 1271 } 1272 1273 static int 1274 ptnet_nm_txsync(struct netmap_kring *kring, int flags) 1275 { 1276 struct ptnet_softc *sc = if_getsoftc(kring->na->ifp); 1277 struct ptnet_queue *pq = sc->queues + kring->ring_id; 1278 bool notify; 1279 1280 notify = netmap_pt_guest_txsync(pq->ptgh, pq->pthg, kring, flags); 1281 if (notify) { 1282 ptnet_kick(pq); 1283 } 1284 1285 return 0; 1286 } 1287 1288 static int 1289 ptnet_nm_rxsync(struct netmap_kring *kring, int flags) 1290 { 1291 struct ptnet_softc *sc = if_getsoftc(kring->na->ifp); 1292 struct ptnet_queue *pq = sc->rxqueues + kring->ring_id; 1293 bool notify; 1294 1295 notify = netmap_pt_guest_rxsync(pq->ptgh, pq->pthg, kring, flags); 1296 if (notify) { 1297 ptnet_kick(pq); 1298 } 1299 1300 return 0; 1301 } 1302 1303 static void 1304 ptnet_nm_intr(struct netmap_adapter *na, int onoff) 1305 { 1306 struct ptnet_softc *sc = if_getsoftc(na->ifp); 1307 int i; 1308 1309 for (i = 0; i < sc->num_rings; i++) { 1310 struct ptnet_queue *pq = sc->queues + i; 1311 pq->ptgh->guest_need_kick = onoff; 1312 } 1313 } 1314 1315 static void 1316 ptnet_tx_intr(void *opaque) 1317 { 1318 struct ptnet_queue *pq = opaque; 1319 struct ptnet_softc *sc = pq->sc; 1320 1321 DBG(device_printf(sc->dev, "Tx interrupt #%d\n", pq->kring_id)); 1322 #ifdef PTNETMAP_STATS 1323 pq->stats.intrs ++; 1324 #endif /* PTNETMAP_STATS */ 1325 1326 if (netmap_tx_irq(sc->ifp, pq->kring_id) != NM_IRQ_PASS) { 1327 return; 1328 } 1329 1330 /* Schedule the tasqueue to flush process transmissions requests. 1331 * However, vtnet, if_em and if_igb just call ptnet_transmit() here, 1332 * at least when using MSI-X interrupts. The if_em driver, instead 1333 * schedule taskqueue when using legacy interrupts. */ 1334 taskqueue_enqueue(pq->taskq, &pq->task); 1335 } 1336 1337 static void 1338 ptnet_rx_intr(void *opaque) 1339 { 1340 struct ptnet_queue *pq = opaque; 1341 struct ptnet_softc *sc = pq->sc; 1342 unsigned int unused; 1343 1344 DBG(device_printf(sc->dev, "Rx interrupt #%d\n", pq->kring_id)); 1345 #ifdef PTNETMAP_STATS 1346 pq->stats.intrs ++; 1347 #endif /* PTNETMAP_STATS */ 1348 1349 if (netmap_rx_irq(sc->ifp, pq->kring_id, &unused) != NM_IRQ_PASS) { 1350 return; 1351 } 1352 1353 /* Like vtnet, if_igb and if_em drivers when using MSI-X interrupts, 1354 * receive-side processing is executed directly in the interrupt 1355 * service routine. Alternatively, we may schedule the taskqueue. */ 1356 ptnet_rx_eof(pq, PTNET_RX_BUDGET, true); 1357 } 1358 1359 /* The following offloadings-related functions are taken from the vtnet 1360 * driver, but the same functionality is required for the ptnet driver. 1361 * As a temporary solution, I copied this code from vtnet and I started 1362 * to generalize it (taking away driver-specific statistic accounting), 1363 * making as little modifications as possible. 1364 * In the future we need to share these functions between vtnet and ptnet. 1365 */ 1366 static int 1367 ptnet_tx_offload_ctx(struct mbuf *m, int *etype, int *proto, int *start) 1368 { 1369 struct ether_vlan_header *evh; 1370 int offset; 1371 1372 evh = mtod(m, struct ether_vlan_header *); 1373 if (evh->evl_encap_proto == htons(ETHERTYPE_VLAN)) { 1374 /* BMV: We should handle nested VLAN tags too. */ 1375 *etype = ntohs(evh->evl_proto); 1376 offset = sizeof(struct ether_vlan_header); 1377 } else { 1378 *etype = ntohs(evh->evl_encap_proto); 1379 offset = sizeof(struct ether_header); 1380 } 1381 1382 switch (*etype) { 1383 #if defined(INET) 1384 case ETHERTYPE_IP: { 1385 struct ip *ip, iphdr; 1386 if (__predict_false(m->m_len < offset + sizeof(struct ip))) { 1387 m_copydata(m, offset, sizeof(struct ip), 1388 (caddr_t) &iphdr); 1389 ip = &iphdr; 1390 } else 1391 ip = (struct ip *)(m->m_data + offset); 1392 *proto = ip->ip_p; 1393 *start = offset + (ip->ip_hl << 2); 1394 break; 1395 } 1396 #endif 1397 #if defined(INET6) 1398 case ETHERTYPE_IPV6: 1399 *proto = -1; 1400 *start = ip6_lasthdr(m, offset, IPPROTO_IPV6, proto); 1401 /* Assert the network stack sent us a valid packet. */ 1402 KASSERT(*start > offset, 1403 ("%s: mbuf %p start %d offset %d proto %d", __func__, m, 1404 *start, offset, *proto)); 1405 break; 1406 #endif 1407 default: 1408 /* Here we should increment the tx_csum_bad_ethtype counter. */ 1409 return (EINVAL); 1410 } 1411 1412 return (0); 1413 } 1414 1415 static int 1416 ptnet_tx_offload_tso(if_t ifp, struct mbuf *m, int eth_type, 1417 int offset, bool allow_ecn, struct virtio_net_hdr *hdr) 1418 { 1419 static struct timeval lastecn; 1420 static int curecn; 1421 struct tcphdr *tcp, tcphdr; 1422 1423 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) { 1424 m_copydata(m, offset, sizeof(struct tcphdr), (caddr_t) &tcphdr); 1425 tcp = &tcphdr; 1426 } else 1427 tcp = (struct tcphdr *)(m->m_data + offset); 1428 1429 hdr->hdr_len = offset + (tcp->th_off << 2); 1430 hdr->gso_size = m->m_pkthdr.tso_segsz; 1431 hdr->gso_type = eth_type == ETHERTYPE_IP ? VIRTIO_NET_HDR_GSO_TCPV4 : 1432 VIRTIO_NET_HDR_GSO_TCPV6; 1433 1434 if (tcp->th_flags & TH_CWR) { 1435 /* 1436 * Drop if VIRTIO_NET_F_HOST_ECN was not negotiated. In FreeBSD, 1437 * ECN support is not on a per-interface basis, but globally via 1438 * the net.inet.tcp.ecn.enable sysctl knob. The default is off. 1439 */ 1440 if (!allow_ecn) { 1441 if (ppsratecheck(&lastecn, &curecn, 1)) 1442 if_printf(ifp, 1443 "TSO with ECN not negotiated with host\n"); 1444 return (ENOTSUP); 1445 } 1446 hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; 1447 } 1448 1449 /* Here we should increment tx_tso counter. */ 1450 1451 return (0); 1452 } 1453 1454 static struct mbuf * 1455 ptnet_tx_offload(if_t ifp, struct mbuf *m, bool allow_ecn, 1456 struct virtio_net_hdr *hdr) 1457 { 1458 int flags, etype, csum_start, proto, error; 1459 1460 flags = m->m_pkthdr.csum_flags; 1461 1462 error = ptnet_tx_offload_ctx(m, &etype, &proto, &csum_start); 1463 if (error) 1464 goto drop; 1465 1466 if ((etype == ETHERTYPE_IP && flags & PTNET_CSUM_OFFLOAD) || 1467 (etype == ETHERTYPE_IPV6 && flags & PTNET_CSUM_OFFLOAD_IPV6)) { 1468 /* 1469 * We could compare the IP protocol vs the CSUM_ flag too, 1470 * but that really should not be necessary. 1471 */ 1472 hdr->flags |= VIRTIO_NET_HDR_F_NEEDS_CSUM; 1473 hdr->csum_start = csum_start; 1474 hdr->csum_offset = m->m_pkthdr.csum_data; 1475 /* Here we should increment the tx_csum counter. */ 1476 } 1477 1478 if (flags & CSUM_TSO) { 1479 if (__predict_false(proto != IPPROTO_TCP)) { 1480 /* Likely failed to correctly parse the mbuf. 1481 * Here we should increment the tx_tso_not_tcp 1482 * counter. */ 1483 goto drop; 1484 } 1485 1486 KASSERT(hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM, 1487 ("%s: mbuf %p TSO without checksum offload %#x", 1488 __func__, m, flags)); 1489 1490 error = ptnet_tx_offload_tso(ifp, m, etype, csum_start, 1491 allow_ecn, hdr); 1492 if (error) 1493 goto drop; 1494 } 1495 1496 return (m); 1497 1498 drop: 1499 m_freem(m); 1500 return (NULL); 1501 } 1502 1503 static void 1504 ptnet_vlan_tag_remove(struct mbuf *m) 1505 { 1506 struct ether_vlan_header *evh; 1507 1508 evh = mtod(m, struct ether_vlan_header *); 1509 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 1510 m->m_flags |= M_VLANTAG; 1511 1512 /* Strip the 802.1Q header. */ 1513 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 1514 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1515 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1516 } 1517 1518 /* 1519 * Use the checksum offset in the VirtIO header to set the 1520 * correct CSUM_* flags. 1521 */ 1522 static int 1523 ptnet_rx_csum_by_offset(struct mbuf *m, uint16_t eth_type, int ip_start, 1524 struct virtio_net_hdr *hdr) 1525 { 1526 #if defined(INET) || defined(INET6) 1527 int offset = hdr->csum_start + hdr->csum_offset; 1528 #endif 1529 1530 /* Only do a basic sanity check on the offset. */ 1531 switch (eth_type) { 1532 #if defined(INET) 1533 case ETHERTYPE_IP: 1534 if (__predict_false(offset < ip_start + sizeof(struct ip))) 1535 return (1); 1536 break; 1537 #endif 1538 #if defined(INET6) 1539 case ETHERTYPE_IPV6: 1540 if (__predict_false(offset < ip_start + sizeof(struct ip6_hdr))) 1541 return (1); 1542 break; 1543 #endif 1544 default: 1545 /* Here we should increment the rx_csum_bad_ethtype counter. */ 1546 return (1); 1547 } 1548 1549 /* 1550 * Use the offset to determine the appropriate CSUM_* flags. This is 1551 * a bit dirty, but we can get by with it since the checksum offsets 1552 * happen to be different. We assume the host host does not do IPv4 1553 * header checksum offloading. 1554 */ 1555 switch (hdr->csum_offset) { 1556 case offsetof(struct udphdr, uh_sum): 1557 case offsetof(struct tcphdr, th_sum): 1558 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1559 m->m_pkthdr.csum_data = 0xFFFF; 1560 break; 1561 case offsetof(struct sctphdr, checksum): 1562 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1563 break; 1564 default: 1565 /* Here we should increment the rx_csum_bad_offset counter. */ 1566 return (1); 1567 } 1568 1569 return (0); 1570 } 1571 1572 static int 1573 ptnet_rx_csum_by_parse(struct mbuf *m, uint16_t eth_type, int ip_start, 1574 struct virtio_net_hdr *hdr) 1575 { 1576 int offset, proto; 1577 1578 switch (eth_type) { 1579 #if defined(INET) 1580 case ETHERTYPE_IP: { 1581 struct ip *ip; 1582 if (__predict_false(m->m_len < ip_start + sizeof(struct ip))) 1583 return (1); 1584 ip = (struct ip *)(m->m_data + ip_start); 1585 proto = ip->ip_p; 1586 offset = ip_start + (ip->ip_hl << 2); 1587 break; 1588 } 1589 #endif 1590 #if defined(INET6) 1591 case ETHERTYPE_IPV6: 1592 if (__predict_false(m->m_len < ip_start + 1593 sizeof(struct ip6_hdr))) 1594 return (1); 1595 offset = ip6_lasthdr(m, ip_start, IPPROTO_IPV6, &proto); 1596 if (__predict_false(offset < 0)) 1597 return (1); 1598 break; 1599 #endif 1600 default: 1601 /* Here we should increment the rx_csum_bad_ethtype counter. */ 1602 return (1); 1603 } 1604 1605 switch (proto) { 1606 case IPPROTO_TCP: 1607 if (__predict_false(m->m_len < offset + sizeof(struct tcphdr))) 1608 return (1); 1609 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1610 m->m_pkthdr.csum_data = 0xFFFF; 1611 break; 1612 case IPPROTO_UDP: 1613 if (__predict_false(m->m_len < offset + sizeof(struct udphdr))) 1614 return (1); 1615 m->m_pkthdr.csum_flags |= CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 1616 m->m_pkthdr.csum_data = 0xFFFF; 1617 break; 1618 case IPPROTO_SCTP: 1619 if (__predict_false(m->m_len < offset + sizeof(struct sctphdr))) 1620 return (1); 1621 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1622 break; 1623 default: 1624 /* 1625 * For the remaining protocols, FreeBSD does not support 1626 * checksum offloading, so the checksum will be recomputed. 1627 */ 1628 #if 0 1629 if_printf(ifp, "cksum offload of unsupported " 1630 "protocol eth_type=%#x proto=%d csum_start=%d " 1631 "csum_offset=%d\n", __func__, eth_type, proto, 1632 hdr->csum_start, hdr->csum_offset); 1633 #endif 1634 break; 1635 } 1636 1637 return (0); 1638 } 1639 1640 /* 1641 * Set the appropriate CSUM_* flags. Unfortunately, the information 1642 * provided is not directly useful to us. The VirtIO header gives the 1643 * offset of the checksum, which is all Linux needs, but this is not 1644 * how FreeBSD does things. We are forced to peek inside the packet 1645 * a bit. 1646 * 1647 * It would be nice if VirtIO gave us the L4 protocol or if FreeBSD 1648 * could accept the offsets and let the stack figure it out. 1649 */ 1650 static int 1651 ptnet_rx_csum(struct mbuf *m, struct virtio_net_hdr *hdr) 1652 { 1653 struct ether_header *eh; 1654 struct ether_vlan_header *evh; 1655 uint16_t eth_type; 1656 int offset, error; 1657 1658 eh = mtod(m, struct ether_header *); 1659 eth_type = ntohs(eh->ether_type); 1660 if (eth_type == ETHERTYPE_VLAN) { 1661 /* BMV: We should handle nested VLAN tags too. */ 1662 evh = mtod(m, struct ether_vlan_header *); 1663 eth_type = ntohs(evh->evl_proto); 1664 offset = sizeof(struct ether_vlan_header); 1665 } else 1666 offset = sizeof(struct ether_header); 1667 1668 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1669 error = ptnet_rx_csum_by_offset(m, eth_type, offset, hdr); 1670 else 1671 error = ptnet_rx_csum_by_parse(m, eth_type, offset, hdr); 1672 1673 return (error); 1674 } 1675 /* End of offloading-related functions to be shared with vtnet. */ 1676 1677 static inline void 1678 ptnet_sync_tail(struct ptnet_csb_hg *pthg, struct netmap_kring *kring) 1679 { 1680 struct netmap_ring *ring = kring->ring; 1681 1682 /* Update hwcur and hwtail as known by the host. */ 1683 ptnetmap_guest_read_kring_csb(pthg, kring); 1684 1685 /* nm_sync_finalize */ 1686 ring->tail = kring->rtail = kring->nr_hwtail; 1687 } 1688 1689 static void 1690 ptnet_ring_update(struct ptnet_queue *pq, struct netmap_kring *kring, 1691 unsigned int head, unsigned int sync_flags) 1692 { 1693 struct netmap_ring *ring = kring->ring; 1694 struct ptnet_csb_gh *ptgh = pq->ptgh; 1695 struct ptnet_csb_hg *pthg = pq->pthg; 1696 1697 /* Some packets have been pushed to the netmap ring. We have 1698 * to tell the host to process the new packets, updating cur 1699 * and head in the CSB. */ 1700 ring->head = ring->cur = head; 1701 1702 /* Mimic nm_txsync_prologue/nm_rxsync_prologue. */ 1703 kring->rcur = kring->rhead = head; 1704 1705 ptnetmap_guest_write_kring_csb(ptgh, kring->rcur, kring->rhead); 1706 1707 /* Kick the host if needed. */ 1708 if (NM_ACCESS_ONCE(pthg->host_need_kick)) { 1709 ptgh->sync_flags = sync_flags; 1710 ptnet_kick(pq); 1711 } 1712 } 1713 1714 #define PTNET_TX_NOSPACE(_h, _k, _min) \ 1715 ((((_h) < (_k)->rtail) ? 0 : (_k)->nkr_num_slots) + \ 1716 (_k)->rtail - (_h)) < (_min) 1717 1718 /* This function may be called by the network stack, or by 1719 * by the taskqueue thread. */ 1720 static int 1721 ptnet_drain_transmit_queue(struct ptnet_queue *pq, unsigned int budget, 1722 bool may_resched) 1723 { 1724 struct ptnet_softc *sc = pq->sc; 1725 bool have_vnet_hdr = sc->vnet_hdr_len; 1726 struct netmap_adapter *na = &sc->ptna->dr.up; 1727 if_t ifp = sc->ifp; 1728 unsigned int batch_count = 0; 1729 struct ptnet_csb_gh *ptgh; 1730 struct ptnet_csb_hg *pthg; 1731 struct netmap_kring *kring; 1732 struct netmap_ring *ring; 1733 struct netmap_slot *slot; 1734 unsigned int count = 0; 1735 unsigned int minspace; 1736 unsigned int head; 1737 unsigned int lim; 1738 struct mbuf *mhead; 1739 struct mbuf *mf; 1740 int nmbuf_bytes; 1741 uint8_t *nmbuf; 1742 1743 if (!PTNET_Q_TRYLOCK(pq)) { 1744 /* We failed to acquire the lock, schedule the taskqueue. */ 1745 RD(1, "Deferring TX work"); 1746 if (may_resched) { 1747 taskqueue_enqueue(pq->taskq, &pq->task); 1748 } 1749 1750 return 0; 1751 } 1752 1753 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 1754 PTNET_Q_UNLOCK(pq); 1755 RD(1, "Interface is down"); 1756 return ENETDOWN; 1757 } 1758 1759 ptgh = pq->ptgh; 1760 pthg = pq->pthg; 1761 kring = na->tx_rings + pq->kring_id; 1762 ring = kring->ring; 1763 lim = kring->nkr_num_slots - 1; 1764 head = ring->head; 1765 minspace = sc->min_tx_space; 1766 1767 while (count < budget) { 1768 if (PTNET_TX_NOSPACE(head, kring, minspace)) { 1769 /* We ran out of slot, let's see if the host has 1770 * freed up some, by reading hwcur and hwtail from 1771 * the CSB. */ 1772 ptnet_sync_tail(pthg, kring); 1773 1774 if (PTNET_TX_NOSPACE(head, kring, minspace)) { 1775 /* Still no slots available. Reactivate the 1776 * interrupts so that we can be notified 1777 * when some free slots are made available by 1778 * the host. */ 1779 ptgh->guest_need_kick = 1; 1780 1781 /* Double-check. */ 1782 ptnet_sync_tail(pthg, kring); 1783 if (likely(PTNET_TX_NOSPACE(head, kring, 1784 minspace))) { 1785 break; 1786 } 1787 1788 RD(1, "Found more slots by doublecheck"); 1789 /* More slots were freed before reactivating 1790 * the interrupts. */ 1791 ptgh->guest_need_kick = 0; 1792 } 1793 } 1794 1795 mhead = drbr_peek(ifp, pq->bufring); 1796 if (!mhead) { 1797 break; 1798 } 1799 1800 /* Initialize transmission state variables. */ 1801 slot = ring->slot + head; 1802 nmbuf = NMB(na, slot); 1803 nmbuf_bytes = 0; 1804 1805 /* If needed, prepare the virtio-net header at the beginning 1806 * of the first slot. */ 1807 if (have_vnet_hdr) { 1808 struct virtio_net_hdr *vh = 1809 (struct virtio_net_hdr *)nmbuf; 1810 1811 /* For performance, we could replace this memset() with 1812 * two 8-bytes-wide writes. */ 1813 memset(nmbuf, 0, PTNET_HDR_SIZE); 1814 if (mhead->m_pkthdr.csum_flags & PTNET_ALL_OFFLOAD) { 1815 mhead = ptnet_tx_offload(ifp, mhead, false, 1816 vh); 1817 if (unlikely(!mhead)) { 1818 /* Packet dropped because errors 1819 * occurred while preparing the vnet 1820 * header. Let's go ahead with the next 1821 * packet. */ 1822 pq->stats.errors ++; 1823 drbr_advance(ifp, pq->bufring); 1824 continue; 1825 } 1826 } 1827 ND(1, "%s: [csum_flags %lX] vnet hdr: flags %x " 1828 "csum_start %u csum_ofs %u hdr_len = %u " 1829 "gso_size %u gso_type %x", __func__, 1830 mhead->m_pkthdr.csum_flags, vh->flags, 1831 vh->csum_start, vh->csum_offset, vh->hdr_len, 1832 vh->gso_size, vh->gso_type); 1833 1834 nmbuf += PTNET_HDR_SIZE; 1835 nmbuf_bytes += PTNET_HDR_SIZE; 1836 } 1837 1838 for (mf = mhead; mf; mf = mf->m_next) { 1839 uint8_t *mdata = mf->m_data; 1840 int mlen = mf->m_len; 1841 1842 for (;;) { 1843 int copy = NETMAP_BUF_SIZE(na) - nmbuf_bytes; 1844 1845 if (mlen < copy) { 1846 copy = mlen; 1847 } 1848 memcpy(nmbuf, mdata, copy); 1849 1850 mdata += copy; 1851 mlen -= copy; 1852 nmbuf += copy; 1853 nmbuf_bytes += copy; 1854 1855 if (!mlen) { 1856 break; 1857 } 1858 1859 slot->len = nmbuf_bytes; 1860 slot->flags = NS_MOREFRAG; 1861 1862 head = nm_next(head, lim); 1863 KASSERT(head != ring->tail, 1864 ("Unexpectedly run out of TX space")); 1865 slot = ring->slot + head; 1866 nmbuf = NMB(na, slot); 1867 nmbuf_bytes = 0; 1868 } 1869 } 1870 1871 /* Complete last slot and update head. */ 1872 slot->len = nmbuf_bytes; 1873 slot->flags = 0; 1874 head = nm_next(head, lim); 1875 1876 /* Consume the packet just processed. */ 1877 drbr_advance(ifp, pq->bufring); 1878 1879 /* Copy the packet to listeners. */ 1880 ETHER_BPF_MTAP(ifp, mhead); 1881 1882 pq->stats.packets ++; 1883 pq->stats.bytes += mhead->m_pkthdr.len; 1884 if (mhead->m_flags & M_MCAST) { 1885 pq->stats.mcasts ++; 1886 } 1887 1888 m_freem(mhead); 1889 1890 count ++; 1891 if (++batch_count == PTNET_TX_BATCH) { 1892 ptnet_ring_update(pq, kring, head, NAF_FORCE_RECLAIM); 1893 batch_count = 0; 1894 } 1895 } 1896 1897 if (batch_count) { 1898 ptnet_ring_update(pq, kring, head, NAF_FORCE_RECLAIM); 1899 } 1900 1901 if (count >= budget && may_resched) { 1902 DBG(RD(1, "out of budget: resched, %d mbufs pending\n", 1903 drbr_inuse(ifp, pq->bufring))); 1904 taskqueue_enqueue(pq->taskq, &pq->task); 1905 } 1906 1907 PTNET_Q_UNLOCK(pq); 1908 1909 return count; 1910 } 1911 1912 static int 1913 ptnet_transmit(if_t ifp, struct mbuf *m) 1914 { 1915 struct ptnet_softc *sc = if_getsoftc(ifp); 1916 struct ptnet_queue *pq; 1917 unsigned int queue_idx; 1918 int err; 1919 1920 DBG(device_printf(sc->dev, "transmit %p\n", m)); 1921 1922 /* Insert 802.1Q header if needed. */ 1923 if (m->m_flags & M_VLANTAG) { 1924 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1925 if (m == NULL) { 1926 return ENOBUFS; 1927 } 1928 m->m_flags &= ~M_VLANTAG; 1929 } 1930 1931 /* Get the flow-id if available. */ 1932 queue_idx = (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) ? 1933 m->m_pkthdr.flowid : curcpu; 1934 1935 if (unlikely(queue_idx >= sc->num_tx_rings)) { 1936 queue_idx %= sc->num_tx_rings; 1937 } 1938 1939 pq = sc->queues + queue_idx; 1940 1941 err = drbr_enqueue(ifp, pq->bufring, m); 1942 if (err) { 1943 /* ENOBUFS when the bufring is full */ 1944 RD(1, "%s: drbr_enqueue() failed %d\n", 1945 __func__, err); 1946 pq->stats.errors ++; 1947 return err; 1948 } 1949 1950 if (ifp->if_capenable & IFCAP_POLLING) { 1951 /* If polling is on, the transmit queues will be 1952 * drained by the poller. */ 1953 return 0; 1954 } 1955 1956 err = ptnet_drain_transmit_queue(pq, PTNET_TX_BUDGET, true); 1957 1958 return (err < 0) ? err : 0; 1959 } 1960 1961 static unsigned int 1962 ptnet_rx_discard(struct netmap_kring *kring, unsigned int head) 1963 { 1964 struct netmap_ring *ring = kring->ring; 1965 struct netmap_slot *slot = ring->slot + head; 1966 1967 for (;;) { 1968 head = nm_next(head, kring->nkr_num_slots - 1); 1969 if (!(slot->flags & NS_MOREFRAG) || head == ring->tail) { 1970 break; 1971 } 1972 slot = ring->slot + head; 1973 } 1974 1975 return head; 1976 } 1977 1978 static inline struct mbuf * 1979 ptnet_rx_slot(struct mbuf *mtail, uint8_t *nmbuf, unsigned int nmbuf_len) 1980 { 1981 uint8_t *mdata = mtod(mtail, uint8_t *) + mtail->m_len; 1982 1983 do { 1984 unsigned int copy; 1985 1986 if (mtail->m_len == MCLBYTES) { 1987 struct mbuf *mf; 1988 1989 mf = m_getcl(M_NOWAIT, MT_DATA, 0); 1990 if (unlikely(!mf)) { 1991 return NULL; 1992 } 1993 1994 mtail->m_next = mf; 1995 mtail = mf; 1996 mdata = mtod(mtail, uint8_t *); 1997 mtail->m_len = 0; 1998 } 1999 2000 copy = MCLBYTES - mtail->m_len; 2001 if (nmbuf_len < copy) { 2002 copy = nmbuf_len; 2003 } 2004 2005 memcpy(mdata, nmbuf, copy); 2006 2007 nmbuf += copy; 2008 nmbuf_len -= copy; 2009 mdata += copy; 2010 mtail->m_len += copy; 2011 } while (nmbuf_len); 2012 2013 return mtail; 2014 } 2015 2016 static int 2017 ptnet_rx_eof(struct ptnet_queue *pq, unsigned int budget, bool may_resched) 2018 { 2019 struct ptnet_softc *sc = pq->sc; 2020 bool have_vnet_hdr = sc->vnet_hdr_len; 2021 struct ptnet_csb_gh *ptgh = pq->ptgh; 2022 struct ptnet_csb_hg *pthg = pq->pthg; 2023 struct netmap_adapter *na = &sc->ptna->dr.up; 2024 struct netmap_kring *kring = na->rx_rings + pq->kring_id; 2025 struct netmap_ring *ring = kring->ring; 2026 unsigned int const lim = kring->nkr_num_slots - 1; 2027 unsigned int batch_count = 0; 2028 if_t ifp = sc->ifp; 2029 unsigned int count = 0; 2030 uint32_t head; 2031 2032 PTNET_Q_LOCK(pq); 2033 2034 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 2035 goto unlock; 2036 } 2037 2038 kring->nr_kflags &= ~NKR_PENDINTR; 2039 2040 head = ring->head; 2041 while (count < budget) { 2042 uint32_t prev_head = head; 2043 struct mbuf *mhead, *mtail; 2044 struct virtio_net_hdr *vh; 2045 struct netmap_slot *slot; 2046 unsigned int nmbuf_len; 2047 uint8_t *nmbuf; 2048 int deliver = 1; /* the mbuf to the network stack. */ 2049 host_sync: 2050 if (head == ring->tail) { 2051 /* We ran out of slot, let's see if the host has 2052 * added some, by reading hwcur and hwtail from 2053 * the CSB. */ 2054 ptnet_sync_tail(pthg, kring); 2055 2056 if (head == ring->tail) { 2057 /* Still no slots available. Reactivate 2058 * interrupts as they were disabled by the 2059 * host thread right before issuing the 2060 * last interrupt. */ 2061 ptgh->guest_need_kick = 1; 2062 2063 /* Double-check. */ 2064 ptnet_sync_tail(pthg, kring); 2065 if (likely(head == ring->tail)) { 2066 break; 2067 } 2068 ptgh->guest_need_kick = 0; 2069 } 2070 } 2071 2072 /* Initialize ring state variables, possibly grabbing the 2073 * virtio-net header. */ 2074 slot = ring->slot + head; 2075 nmbuf = NMB(na, slot); 2076 nmbuf_len = slot->len; 2077 2078 vh = (struct virtio_net_hdr *)nmbuf; 2079 if (have_vnet_hdr) { 2080 if (unlikely(nmbuf_len < PTNET_HDR_SIZE)) { 2081 /* There is no good reason why host should 2082 * put the header in multiple netmap slots. 2083 * If this is the case, discard. */ 2084 RD(1, "Fragmented vnet-hdr: dropping"); 2085 head = ptnet_rx_discard(kring, head); 2086 pq->stats.iqdrops ++; 2087 deliver = 0; 2088 goto skip; 2089 } 2090 ND(1, "%s: vnet hdr: flags %x csum_start %u " 2091 "csum_ofs %u hdr_len = %u gso_size %u " 2092 "gso_type %x", __func__, vh->flags, 2093 vh->csum_start, vh->csum_offset, vh->hdr_len, 2094 vh->gso_size, vh->gso_type); 2095 nmbuf += PTNET_HDR_SIZE; 2096 nmbuf_len -= PTNET_HDR_SIZE; 2097 } 2098 2099 /* Allocate the head of a new mbuf chain. 2100 * We use m_getcl() to allocate an mbuf with standard cluster 2101 * size (MCLBYTES). In the future we could use m_getjcl() 2102 * to choose different sizes. */ 2103 mhead = mtail = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 2104 if (unlikely(mhead == NULL)) { 2105 device_printf(sc->dev, "%s: failed to allocate mbuf " 2106 "head\n", __func__); 2107 pq->stats.errors ++; 2108 break; 2109 } 2110 2111 /* Initialize the mbuf state variables. */ 2112 mhead->m_pkthdr.len = nmbuf_len; 2113 mtail->m_len = 0; 2114 2115 /* Scan all the netmap slots containing the current packet. */ 2116 for (;;) { 2117 DBG(device_printf(sc->dev, "%s: h %u t %u rcv frag " 2118 "len %u, flags %u\n", __func__, 2119 head, ring->tail, slot->len, 2120 slot->flags)); 2121 2122 mtail = ptnet_rx_slot(mtail, nmbuf, nmbuf_len); 2123 if (unlikely(!mtail)) { 2124 /* Ouch. We ran out of memory while processing 2125 * a packet. We have to restore the previous 2126 * head position, free the mbuf chain, and 2127 * schedule the taskqueue to give the packet 2128 * another chance. */ 2129 device_printf(sc->dev, "%s: failed to allocate" 2130 " mbuf frag, reset head %u --> %u\n", 2131 __func__, head, prev_head); 2132 head = prev_head; 2133 m_freem(mhead); 2134 pq->stats.errors ++; 2135 if (may_resched) { 2136 taskqueue_enqueue(pq->taskq, 2137 &pq->task); 2138 } 2139 goto escape; 2140 } 2141 2142 /* We have to increment head irrespective of the 2143 * NS_MOREFRAG being set or not. */ 2144 head = nm_next(head, lim); 2145 2146 if (!(slot->flags & NS_MOREFRAG)) { 2147 break; 2148 } 2149 2150 if (unlikely(head == ring->tail)) { 2151 /* The very last slot prepared by the host has 2152 * the NS_MOREFRAG set. Drop it and continue 2153 * the outer cycle (to do the double-check). */ 2154 RD(1, "Incomplete packet: dropping"); 2155 m_freem(mhead); 2156 pq->stats.iqdrops ++; 2157 goto host_sync; 2158 } 2159 2160 slot = ring->slot + head; 2161 nmbuf = NMB(na, slot); 2162 nmbuf_len = slot->len; 2163 mhead->m_pkthdr.len += nmbuf_len; 2164 } 2165 2166 mhead->m_pkthdr.rcvif = ifp; 2167 mhead->m_pkthdr.csum_flags = 0; 2168 2169 /* Store the queue idx in the packet header. */ 2170 mhead->m_pkthdr.flowid = pq->kring_id; 2171 M_HASHTYPE_SET(mhead, M_HASHTYPE_OPAQUE); 2172 2173 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 2174 struct ether_header *eh; 2175 2176 eh = mtod(mhead, struct ether_header *); 2177 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 2178 ptnet_vlan_tag_remove(mhead); 2179 /* 2180 * With the 802.1Q header removed, update the 2181 * checksum starting location accordingly. 2182 */ 2183 if (vh->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 2184 vh->csum_start -= ETHER_VLAN_ENCAP_LEN; 2185 } 2186 } 2187 2188 if (have_vnet_hdr && (vh->flags & (VIRTIO_NET_HDR_F_NEEDS_CSUM 2189 | VIRTIO_NET_HDR_F_DATA_VALID))) { 2190 if (unlikely(ptnet_rx_csum(mhead, vh))) { 2191 m_freem(mhead); 2192 RD(1, "Csum offload error: dropping"); 2193 pq->stats.iqdrops ++; 2194 deliver = 0; 2195 } 2196 } 2197 2198 skip: 2199 count ++; 2200 if (++batch_count >= PTNET_RX_BATCH) { 2201 /* Some packets have been (or will be) pushed to the network 2202 * stack. We need to update the CSB to tell the host about 2203 * the new ring->cur and ring->head (RX buffer refill). */ 2204 ptnet_ring_update(pq, kring, head, NAF_FORCE_READ); 2205 batch_count = 0; 2206 } 2207 2208 if (likely(deliver)) { 2209 pq->stats.packets ++; 2210 pq->stats.bytes += mhead->m_pkthdr.len; 2211 2212 PTNET_Q_UNLOCK(pq); 2213 (*ifp->if_input)(ifp, mhead); 2214 PTNET_Q_LOCK(pq); 2215 /* The ring->head index (and related indices) are 2216 * updated under pq lock by ptnet_ring_update(). 2217 * Since we dropped the lock to call if_input(), we 2218 * must reload ring->head and restart processing the 2219 * ring from there. */ 2220 head = ring->head; 2221 2222 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 2223 /* The interface has gone down while we didn't 2224 * have the lock. Stop any processing and exit. */ 2225 goto unlock; 2226 } 2227 } 2228 } 2229 escape: 2230 if (batch_count) { 2231 ptnet_ring_update(pq, kring, head, NAF_FORCE_READ); 2232 2233 } 2234 2235 if (count >= budget && may_resched) { 2236 /* If we ran out of budget or the double-check found new 2237 * slots to process, schedule the taskqueue. */ 2238 DBG(RD(1, "out of budget: resched h %u t %u\n", 2239 head, ring->tail)); 2240 taskqueue_enqueue(pq->taskq, &pq->task); 2241 } 2242 unlock: 2243 PTNET_Q_UNLOCK(pq); 2244 2245 return count; 2246 } 2247 2248 static void 2249 ptnet_rx_task(void *context, int pending) 2250 { 2251 struct ptnet_queue *pq = context; 2252 2253 DBG(RD(1, "%s: pq #%u\n", __func__, pq->kring_id)); 2254 ptnet_rx_eof(pq, PTNET_RX_BUDGET, true); 2255 } 2256 2257 static void 2258 ptnet_tx_task(void *context, int pending) 2259 { 2260 struct ptnet_queue *pq = context; 2261 2262 DBG(RD(1, "%s: pq #%u\n", __func__, pq->kring_id)); 2263 ptnet_drain_transmit_queue(pq, PTNET_TX_BUDGET, true); 2264 } 2265 2266 #ifdef DEVICE_POLLING 2267 /* We don't need to handle differently POLL_AND_CHECK_STATUS and 2268 * POLL_ONLY, since we don't have an Interrupt Status Register. */ 2269 static int 2270 ptnet_poll(if_t ifp, enum poll_cmd cmd, int budget) 2271 { 2272 struct ptnet_softc *sc = if_getsoftc(ifp); 2273 unsigned int queue_budget; 2274 unsigned int count = 0; 2275 bool borrow = false; 2276 int i; 2277 2278 KASSERT(sc->num_rings > 0, ("Found no queues in while polling ptnet")); 2279 queue_budget = MAX(budget / sc->num_rings, 1); 2280 RD(1, "Per-queue budget is %d", queue_budget); 2281 2282 while (budget) { 2283 unsigned int rcnt = 0; 2284 2285 for (i = 0; i < sc->num_rings; i++) { 2286 struct ptnet_queue *pq = sc->queues + i; 2287 2288 if (borrow) { 2289 queue_budget = MIN(queue_budget, budget); 2290 if (queue_budget == 0) { 2291 break; 2292 } 2293 } 2294 2295 if (i < sc->num_tx_rings) { 2296 rcnt += ptnet_drain_transmit_queue(pq, 2297 queue_budget, false); 2298 } else { 2299 rcnt += ptnet_rx_eof(pq, queue_budget, 2300 false); 2301 } 2302 } 2303 2304 if (!rcnt) { 2305 /* A scan of the queues gave no result, we can 2306 * stop here. */ 2307 break; 2308 } 2309 2310 if (rcnt > budget) { 2311 /* This may happen when initial budget < sc->num_rings, 2312 * since one packet budget is given to each queue 2313 * anyway. Just pretend we didn't eat "so much". */ 2314 rcnt = budget; 2315 } 2316 count += rcnt; 2317 budget -= rcnt; 2318 borrow = true; 2319 } 2320 2321 2322 return count; 2323 } 2324 #endif /* DEVICE_POLLING */ 2325