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 72 #include <machine/bus.h> 73 #include <machine/resource.h> 74 #include <sys/bus.h> 75 #include <sys/rman.h> 76 77 #include <dev/pci/pcivar.h> 78 #include <dev/pci/pcireg.h> 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/selinfo.h> 84 #include <net/netmap.h> 85 #include <dev/netmap/netmap_kern.h> 86 #include <net/netmap_virt.h> 87 #include <dev/netmap/netmap_mem2.h> 88 #include <dev/virtio/network/virtio_net.h> 89 90 #ifdef WITH_PTNETMAP 91 92 #ifndef INET 93 #error "INET not defined, cannot support offloadings" 94 #endif 95 96 #if __FreeBSD_version >= 1100000 97 static uint64_t ptnet_get_counter(if_t, ift_counter); 98 #else 99 typedef struct ifnet *if_t; 100 #define if_getsoftc(_ifp) (_ifp)->if_softc 101 #endif 102 103 //#define PTNETMAP_STATS 104 //#define DEBUG 105 #ifdef DEBUG 106 #define DBG(x) x 107 #else /* !DEBUG */ 108 #define DBG(x) 109 #endif /* !DEBUG */ 110 111 extern int ptnet_vnet_hdr; /* Tunable parameter */ 112 113 struct ptnet_softc; 114 115 struct ptnet_queue_stats { 116 uint64_t packets; /* if_[io]packets */ 117 uint64_t bytes; /* if_[io]bytes */ 118 uint64_t errors; /* if_[io]errors */ 119 uint64_t iqdrops; /* if_iqdrops */ 120 uint64_t mcasts; /* if_[io]mcasts */ 121 #ifdef PTNETMAP_STATS 122 uint64_t intrs; 123 uint64_t kicks; 124 #endif /* PTNETMAP_STATS */ 125 }; 126 127 struct ptnet_queue { 128 struct ptnet_softc *sc; 129 struct resource *irq; 130 void *cookie; 131 int kring_id; 132 struct nm_csb_atok *atok; 133 struct nm_csb_ktoa *ktoa; 134 unsigned int kick; 135 struct mtx lock; 136 struct buf_ring *bufring; /* for TX queues */ 137 struct ptnet_queue_stats stats; 138 #ifdef PTNETMAP_STATS 139 struct ptnet_queue_stats last_stats; 140 #endif /* PTNETMAP_STATS */ 141 struct taskqueue *taskq; 142 struct task task; 143 char lock_name[16]; 144 }; 145 146 #define PTNET_Q_LOCK(_pq) mtx_lock(&(_pq)->lock) 147 #define PTNET_Q_TRYLOCK(_pq) mtx_trylock(&(_pq)->lock) 148 #define PTNET_Q_UNLOCK(_pq) mtx_unlock(&(_pq)->lock) 149 150 struct ptnet_softc { 151 device_t dev; 152 if_t ifp; 153 struct ifmedia media; 154 struct mtx lock; 155 char lock_name[16]; 156 char hwaddr[ETHER_ADDR_LEN]; 157 158 /* Mirror of PTFEAT register. */ 159 uint32_t ptfeatures; 160 unsigned int vnet_hdr_len; 161 162 /* PCI BARs support. */ 163 struct resource *iomem; 164 struct resource *msix_mem; 165 166 unsigned int num_rings; 167 unsigned int num_tx_rings; 168 struct ptnet_queue *queues; 169 struct ptnet_queue *rxqueues; 170 struct nm_csb_atok *csb_gh; 171 struct nm_csb_ktoa *csb_hg; 172 173 unsigned int min_tx_space; 174 175 struct netmap_pt_guest_adapter *ptna; 176 177 struct callout tick; 178 #ifdef PTNETMAP_STATS 179 struct timeval last_ts; 180 #endif /* PTNETMAP_STATS */ 181 }; 182 183 #define PTNET_CORE_LOCK(_sc) mtx_lock(&(_sc)->lock) 184 #define PTNET_CORE_UNLOCK(_sc) mtx_unlock(&(_sc)->lock) 185 186 static int ptnet_probe(device_t); 187 static int ptnet_attach(device_t); 188 static int ptnet_detach(device_t); 189 static int ptnet_suspend(device_t); 190 static int ptnet_resume(device_t); 191 static int ptnet_shutdown(device_t); 192 193 static void ptnet_init(void *opaque); 194 static int ptnet_ioctl(if_t ifp, u_long cmd, caddr_t data); 195 static int ptnet_init_locked(struct ptnet_softc *sc); 196 static int ptnet_stop(struct ptnet_softc *sc); 197 static int ptnet_transmit(if_t ifp, struct mbuf *m); 198 static int ptnet_drain_transmit_queue(struct ptnet_queue *pq, 199 unsigned int budget, 200 bool may_resched); 201 static void ptnet_qflush(if_t ifp); 202 static void ptnet_tx_task(void *context, int pending); 203 204 static int ptnet_media_change(if_t ifp); 205 static void ptnet_media_status(if_t ifp, struct ifmediareq *ifmr); 206 #ifdef PTNETMAP_STATS 207 static void ptnet_tick(void *opaque); 208 #endif 209 210 static int ptnet_irqs_init(struct ptnet_softc *sc); 211 static void ptnet_irqs_fini(struct ptnet_softc *sc); 212 213 static uint32_t ptnet_nm_ptctl(struct ptnet_softc *sc, uint32_t cmd); 214 static int ptnet_nm_config(struct netmap_adapter *na, 215 struct nm_config_info *info); 216 static void ptnet_update_vnet_hdr(struct ptnet_softc *sc); 217 static int ptnet_nm_register(struct netmap_adapter *na, int onoff); 218 static int ptnet_nm_txsync(struct netmap_kring *kring, int flags); 219 static int ptnet_nm_rxsync(struct netmap_kring *kring, int flags); 220 static void ptnet_nm_intr(struct netmap_adapter *na, int onoff); 221 222 static void ptnet_tx_intr(void *opaque); 223 static void ptnet_rx_intr(void *opaque); 224 225 static unsigned ptnet_rx_discard(struct netmap_kring *kring, 226 unsigned int head); 227 static int ptnet_rx_eof(struct ptnet_queue *pq, unsigned int budget, 228 bool may_resched); 229 static void ptnet_rx_task(void *context, int pending); 230 231 #ifdef DEVICE_POLLING 232 static poll_handler_t ptnet_poll; 233 #endif 234 235 static device_method_t ptnet_methods[] = { 236 DEVMETHOD(device_probe, ptnet_probe), 237 DEVMETHOD(device_attach, ptnet_attach), 238 DEVMETHOD(device_detach, ptnet_detach), 239 DEVMETHOD(device_suspend, ptnet_suspend), 240 DEVMETHOD(device_resume, ptnet_resume), 241 DEVMETHOD(device_shutdown, ptnet_shutdown), 242 DEVMETHOD_END 243 }; 244 245 static driver_t ptnet_driver = { 246 "ptnet", 247 ptnet_methods, 248 sizeof(struct ptnet_softc) 249 }; 250 251 /* We use (SI_ORDER_MIDDLE+2) here, see DEV_MODULE_ORDERED() invocation. */ 252 DRIVER_MODULE_ORDERED(ptnet, pci, ptnet_driver, NULL, NULL, 253 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) 285 #define PTNET_CSUM_OFFLOAD_IPV6 (CSUM_TCP_IPV6 | CSUM_UDP_IPV6) 286 #define PTNET_ALL_OFFLOAD (CSUM_TSO | PTNET_CSUM_OFFLOAD |\ 287 PTNET_CSUM_OFFLOAD_IPV6) 288 289 static int 290 ptnet_attach(device_t dev) 291 { 292 uint32_t ptfeatures = 0; 293 unsigned int num_rx_rings, num_tx_rings; 294 struct netmap_adapter na_arg; 295 unsigned int nifp_offset; 296 struct ptnet_softc *sc; 297 if_t ifp; 298 uint32_t macreg; 299 int err, rid; 300 int i; 301 302 sc = device_get_softc(dev); 303 sc->dev = dev; 304 305 /* Setup PCI resources. */ 306 pci_enable_busmaster(dev); 307 308 rid = PCIR_BAR(PTNETMAP_IO_PCI_BAR); 309 sc->iomem = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, 310 RF_ACTIVE); 311 if (sc->iomem == NULL) { 312 device_printf(dev, "Failed to map I/O BAR\n"); 313 return (ENXIO); 314 } 315 316 /* Negotiate features with the hypervisor. */ 317 if (ptnet_vnet_hdr) { 318 ptfeatures |= PTNETMAP_F_VNET_HDR; 319 } 320 bus_write_4(sc->iomem, PTNET_IO_PTFEAT, ptfeatures); /* wanted */ 321 ptfeatures = bus_read_4(sc->iomem, PTNET_IO_PTFEAT); /* acked */ 322 sc->ptfeatures = ptfeatures; 323 324 num_tx_rings = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_RINGS); 325 num_rx_rings = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_RINGS); 326 sc->num_rings = num_tx_rings + num_rx_rings; 327 sc->num_tx_rings = num_tx_rings; 328 329 if (sc->num_rings * sizeof(struct nm_csb_atok) > PAGE_SIZE) { 330 device_printf(dev, "CSB cannot handle that many rings (%u)\n", 331 sc->num_rings); 332 err = ENOMEM; 333 goto err_path; 334 } 335 336 /* Allocate CSB and carry out CSB allocation protocol. */ 337 sc->csb_gh = contigmalloc(2*PAGE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO, 338 (size_t)0, -1UL, PAGE_SIZE, 0); 339 if (sc->csb_gh == NULL) { 340 device_printf(dev, "Failed to allocate CSB\n"); 341 err = ENOMEM; 342 goto err_path; 343 } 344 sc->csb_hg = (struct nm_csb_ktoa *)(((char *)sc->csb_gh) + PAGE_SIZE); 345 346 { 347 /* 348 * We use uint64_t rather than vm_paddr_t since we 349 * need 64 bit addresses even on 32 bit platforms. 350 */ 351 uint64_t paddr = vtophys(sc->csb_gh); 352 353 /* CSB allocation protocol: write to BAH first, then 354 * to BAL (for both GH and HG sections). */ 355 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAH, 356 (paddr >> 32) & 0xffffffff); 357 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAL, 358 paddr & 0xffffffff); 359 paddr = vtophys(sc->csb_hg); 360 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAH, 361 (paddr >> 32) & 0xffffffff); 362 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAL, 363 paddr & 0xffffffff); 364 } 365 366 /* Allocate and initialize per-queue data structures. */ 367 sc->queues = malloc(sizeof(struct ptnet_queue) * sc->num_rings, 368 M_DEVBUF, M_NOWAIT | M_ZERO); 369 if (sc->queues == NULL) { 370 err = ENOMEM; 371 goto err_path; 372 } 373 sc->rxqueues = sc->queues + num_tx_rings; 374 375 for (i = 0; i < sc->num_rings; i++) { 376 struct ptnet_queue *pq = sc->queues + i; 377 378 pq->sc = sc; 379 pq->kring_id = i; 380 pq->kick = PTNET_IO_KICK_BASE + 4 * i; 381 pq->atok = sc->csb_gh + i; 382 pq->ktoa = sc->csb_hg + i; 383 snprintf(pq->lock_name, sizeof(pq->lock_name), "%s-%d", 384 device_get_nameunit(dev), i); 385 mtx_init(&pq->lock, pq->lock_name, NULL, MTX_DEF); 386 if (i >= num_tx_rings) { 387 /* RX queue: fix kring_id. */ 388 pq->kring_id -= num_tx_rings; 389 } else { 390 /* TX queue: allocate buf_ring. */ 391 pq->bufring = buf_ring_alloc(PTNET_BUF_RING_SIZE, 392 M_DEVBUF, M_NOWAIT, &pq->lock); 393 if (pq->bufring == NULL) { 394 err = ENOMEM; 395 goto err_path; 396 } 397 } 398 } 399 400 sc->min_tx_space = 64; /* Safe initial value. */ 401 402 err = ptnet_irqs_init(sc); 403 if (err) { 404 goto err_path; 405 } 406 407 /* Setup Ethernet interface. */ 408 sc->ifp = ifp = if_alloc(IFT_ETHER); 409 if (ifp == NULL) { 410 device_printf(dev, "Failed to allocate ifnet\n"); 411 err = ENOMEM; 412 goto err_path; 413 } 414 415 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 416 ifp->if_baudrate = IF_Gbps(10); 417 ifp->if_softc = sc; 418 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX; 419 ifp->if_init = ptnet_init; 420 ifp->if_ioctl = ptnet_ioctl; 421 #if __FreeBSD_version >= 1100000 422 ifp->if_get_counter = ptnet_get_counter; 423 #endif 424 ifp->if_transmit = ptnet_transmit; 425 ifp->if_qflush = ptnet_qflush; 426 427 ifmedia_init(&sc->media, IFM_IMASK, ptnet_media_change, 428 ptnet_media_status); 429 ifmedia_add(&sc->media, IFM_ETHER | IFM_10G_T | IFM_FDX, 0, NULL); 430 ifmedia_set(&sc->media, IFM_ETHER | IFM_10G_T | IFM_FDX); 431 432 macreg = bus_read_4(sc->iomem, PTNET_IO_MAC_HI); 433 sc->hwaddr[0] = (macreg >> 8) & 0xff; 434 sc->hwaddr[1] = macreg & 0xff; 435 macreg = bus_read_4(sc->iomem, PTNET_IO_MAC_LO); 436 sc->hwaddr[2] = (macreg >> 24) & 0xff; 437 sc->hwaddr[3] = (macreg >> 16) & 0xff; 438 sc->hwaddr[4] = (macreg >> 8) & 0xff; 439 sc->hwaddr[5] = macreg & 0xff; 440 441 ether_ifattach(ifp, sc->hwaddr); 442 443 ifp->if_hdrlen = sizeof(struct ether_vlan_header); 444 ifp->if_capabilities |= IFCAP_JUMBO_MTU | IFCAP_VLAN_MTU; 445 446 if (sc->ptfeatures & PTNETMAP_F_VNET_HDR) { 447 /* Similarly to what the vtnet driver does, we can emulate 448 * VLAN offloadings by inserting and removing the 802.1Q 449 * header during transmit and receive. We are then able 450 * to do checksum offloading of VLAN frames. */ 451 ifp->if_capabilities |= IFCAP_HWCSUM | IFCAP_HWCSUM_IPV6 452 | IFCAP_VLAN_HWCSUM 453 | IFCAP_TSO | IFCAP_LRO 454 | IFCAP_VLAN_HWTSO 455 | IFCAP_VLAN_HWTAGGING; 456 } 457 458 ifp->if_capenable = ifp->if_capabilities; 459 #ifdef DEVICE_POLLING 460 /* Don't enable polling by default. */ 461 ifp->if_capabilities |= IFCAP_POLLING; 462 #endif 463 snprintf(sc->lock_name, sizeof(sc->lock_name), 464 "%s", device_get_nameunit(dev)); 465 mtx_init(&sc->lock, sc->lock_name, "ptnet core lock", MTX_DEF); 466 callout_init_mtx(&sc->tick, &sc->lock, 0); 467 468 /* Prepare a netmap_adapter struct instance to do netmap_attach(). */ 469 nifp_offset = bus_read_4(sc->iomem, PTNET_IO_NIFP_OFS); 470 memset(&na_arg, 0, sizeof(na_arg)); 471 na_arg.ifp = ifp; 472 na_arg.num_tx_desc = bus_read_4(sc->iomem, PTNET_IO_NUM_TX_SLOTS); 473 na_arg.num_rx_desc = bus_read_4(sc->iomem, PTNET_IO_NUM_RX_SLOTS); 474 na_arg.num_tx_rings = num_tx_rings; 475 na_arg.num_rx_rings = num_rx_rings; 476 na_arg.nm_config = ptnet_nm_config; 477 na_arg.nm_krings_create = ptnet_nm_krings_create; 478 na_arg.nm_krings_delete = ptnet_nm_krings_delete; 479 na_arg.nm_dtor = ptnet_nm_dtor; 480 na_arg.nm_intr = ptnet_nm_intr; 481 na_arg.nm_register = ptnet_nm_register; 482 na_arg.nm_txsync = ptnet_nm_txsync; 483 na_arg.nm_rxsync = ptnet_nm_rxsync; 484 485 netmap_pt_guest_attach(&na_arg, nifp_offset, 486 bus_read_4(sc->iomem, PTNET_IO_HOSTMEMID)); 487 488 /* Now a netmap adapter for this ifp has been allocated, and it 489 * can be accessed through NA(ifp). We also have to initialize the CSB 490 * pointer. */ 491 sc->ptna = (struct netmap_pt_guest_adapter *)NA(ifp); 492 493 /* If virtio-net header was negotiated, set the virt_hdr_len field in 494 * the netmap adapter, to inform users that this netmap adapter requires 495 * the application to deal with the headers. */ 496 ptnet_update_vnet_hdr(sc); 497 498 device_printf(dev, "%s() completed\n", __func__); 499 500 return (0); 501 502 err_path: 503 ptnet_detach(dev); 504 return err; 505 } 506 507 /* Stop host sync-kloop if it was running. */ 508 static void 509 ptnet_device_shutdown(struct ptnet_softc *sc) 510 { 511 ptnet_nm_ptctl(sc, PTNETMAP_PTCTL_DELETE); 512 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAH, 0); 513 bus_write_4(sc->iomem, PTNET_IO_CSB_GH_BAL, 0); 514 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAH, 0); 515 bus_write_4(sc->iomem, PTNET_IO_CSB_HG_BAL, 0); 516 } 517 518 static int 519 ptnet_detach(device_t dev) 520 { 521 struct ptnet_softc *sc = device_get_softc(dev); 522 int i; 523 524 ptnet_device_shutdown(sc); 525 526 #ifdef DEVICE_POLLING 527 if (sc->ifp->if_capenable & IFCAP_POLLING) { 528 ether_poll_deregister(sc->ifp); 529 } 530 #endif 531 callout_drain(&sc->tick); 532 533 if (sc->queues) { 534 /* Drain taskqueues before calling if_detach. */ 535 for (i = 0; i < sc->num_rings; i++) { 536 struct ptnet_queue *pq = sc->queues + i; 537 538 if (pq->taskq) { 539 taskqueue_drain(pq->taskq, &pq->task); 540 } 541 } 542 } 543 544 if (sc->ifp) { 545 ether_ifdetach(sc->ifp); 546 547 /* Uninitialize netmap adapters for this device. */ 548 netmap_detach(sc->ifp); 549 550 ifmedia_removeall(&sc->media); 551 if_free(sc->ifp); 552 sc->ifp = NULL; 553 } 554 555 ptnet_irqs_fini(sc); 556 557 if (sc->csb_gh) { 558 contigfree(sc->csb_gh, 2*PAGE_SIZE, M_DEVBUF); 559 sc->csb_gh = NULL; 560 sc->csb_hg = NULL; 561 } 562 563 if (sc->queues) { 564 for (i = 0; i < sc->num_rings; i++) { 565 struct ptnet_queue *pq = sc->queues + i; 566 567 if (mtx_initialized(&pq->lock)) { 568 mtx_destroy(&pq->lock); 569 } 570 if (pq->bufring != NULL) { 571 buf_ring_free(pq->bufring, M_DEVBUF); 572 } 573 } 574 free(sc->queues, M_DEVBUF); 575 sc->queues = NULL; 576 } 577 578 if (sc->iomem) { 579 bus_release_resource(dev, SYS_RES_IOPORT, 580 PCIR_BAR(PTNETMAP_IO_PCI_BAR), sc->iomem); 581 sc->iomem = NULL; 582 } 583 584 mtx_destroy(&sc->lock); 585 586 device_printf(dev, "%s() completed\n", __func__); 587 588 return (0); 589 } 590 591 static int 592 ptnet_suspend(device_t dev) 593 { 594 struct ptnet_softc *sc = device_get_softc(dev); 595 596 (void)sc; 597 598 return (0); 599 } 600 601 static int 602 ptnet_resume(device_t dev) 603 { 604 struct ptnet_softc *sc = device_get_softc(dev); 605 606 (void)sc; 607 608 return (0); 609 } 610 611 static int 612 ptnet_shutdown(device_t dev) 613 { 614 struct ptnet_softc *sc = device_get_softc(dev); 615 616 ptnet_device_shutdown(sc); 617 618 return (0); 619 } 620 621 static int 622 ptnet_irqs_init(struct ptnet_softc *sc) 623 { 624 int rid = PCIR_BAR(PTNETMAP_MSIX_PCI_BAR); 625 int nvecs = sc->num_rings; 626 device_t dev = sc->dev; 627 int err = ENOSPC; 628 int cpu_cur; 629 int i; 630 631 if (pci_find_cap(dev, PCIY_MSIX, NULL) != 0) { 632 device_printf(dev, "Could not find MSI-X capability\n"); 633 return (ENXIO); 634 } 635 636 sc->msix_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 637 &rid, RF_ACTIVE); 638 if (sc->msix_mem == NULL) { 639 device_printf(dev, "Failed to allocate MSIX PCI BAR\n"); 640 return (ENXIO); 641 } 642 643 if (pci_msix_count(dev) < nvecs) { 644 device_printf(dev, "Not enough MSI-X vectors\n"); 645 goto err_path; 646 } 647 648 err = pci_alloc_msix(dev, &nvecs); 649 if (err) { 650 device_printf(dev, "Failed to allocate MSI-X vectors\n"); 651 goto err_path; 652 } 653 654 for (i = 0; i < nvecs; i++) { 655 struct ptnet_queue *pq = sc->queues + i; 656 657 rid = i + 1; 658 pq->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 659 RF_ACTIVE); 660 if (pq->irq == NULL) { 661 device_printf(dev, "Failed to allocate interrupt " 662 "for queue #%d\n", i); 663 err = ENOSPC; 664 goto err_path; 665 } 666 } 667 668 cpu_cur = CPU_FIRST(); 669 for (i = 0; i < nvecs; i++) { 670 struct ptnet_queue *pq = sc->queues + i; 671 void (*handler)(void *) = ptnet_tx_intr; 672 673 if (i >= sc->num_tx_rings) { 674 handler = ptnet_rx_intr; 675 } 676 err = bus_setup_intr(dev, pq->irq, INTR_TYPE_NET | INTR_MPSAFE, 677 NULL /* intr_filter */, handler, 678 pq, &pq->cookie); 679 if (err) { 680 device_printf(dev, "Failed to register intr handler " 681 "for queue #%d\n", i); 682 goto err_path; 683 } 684 685 bus_describe_intr(dev, pq->irq, pq->cookie, "q%d", i); 686 #if 0 687 bus_bind_intr(sc->dev, pq->irq, cpu_cur); 688 #endif 689 cpu_cur = CPU_NEXT(cpu_cur); 690 } 691 692 device_printf(dev, "Allocated %d MSI-X vectors\n", nvecs); 693 694 cpu_cur = CPU_FIRST(); 695 for (i = 0; i < nvecs; i++) { 696 struct ptnet_queue *pq = sc->queues + i; 697 698 if (i < sc->num_tx_rings) 699 TASK_INIT(&pq->task, 0, ptnet_tx_task, pq); 700 else 701 NET_TASK_INIT(&pq->task, 0, ptnet_rx_task, pq); 702 703 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 static void 1341 ptnet_vlan_tag_remove(struct mbuf *m) 1342 { 1343 struct ether_vlan_header *evh; 1344 1345 evh = mtod(m, struct ether_vlan_header *); 1346 m->m_pkthdr.ether_vtag = ntohs(evh->evl_tag); 1347 m->m_flags |= M_VLANTAG; 1348 1349 /* Strip the 802.1Q header. */ 1350 bcopy((char *) evh, (char *) evh + ETHER_VLAN_ENCAP_LEN, 1351 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1352 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1353 } 1354 1355 static void 1356 ptnet_ring_update(struct ptnet_queue *pq, struct netmap_kring *kring, 1357 unsigned int head, unsigned int sync_flags) 1358 { 1359 struct netmap_ring *ring = kring->ring; 1360 struct nm_csb_atok *atok = pq->atok; 1361 struct nm_csb_ktoa *ktoa = pq->ktoa; 1362 1363 /* Some packets have been pushed to the netmap ring. We have 1364 * to tell the host to process the new packets, updating cur 1365 * and head in the CSB. */ 1366 ring->head = ring->cur = head; 1367 1368 /* Mimic nm_txsync_prologue/nm_rxsync_prologue. */ 1369 kring->rcur = kring->rhead = head; 1370 1371 nm_sync_kloop_appl_write(atok, kring->rcur, kring->rhead); 1372 1373 /* Kick the host if needed. */ 1374 if (NM_ACCESS_ONCE(ktoa->kern_need_kick)) { 1375 atok->sync_flags = sync_flags; 1376 ptnet_kick(pq); 1377 } 1378 } 1379 1380 #define PTNET_TX_NOSPACE(_h, _k, _min) \ 1381 ((((_h) < (_k)->rtail) ? 0 : (_k)->nkr_num_slots) + \ 1382 (_k)->rtail - (_h)) < (_min) 1383 1384 /* This function may be called by the network stack, or by 1385 * by the taskqueue thread. */ 1386 static int 1387 ptnet_drain_transmit_queue(struct ptnet_queue *pq, unsigned int budget, 1388 bool may_resched) 1389 { 1390 struct ptnet_softc *sc = pq->sc; 1391 bool have_vnet_hdr = sc->vnet_hdr_len; 1392 struct netmap_adapter *na = &sc->ptna->dr.up; 1393 if_t ifp = sc->ifp; 1394 unsigned int batch_count = 0; 1395 struct nm_csb_atok *atok; 1396 struct nm_csb_ktoa *ktoa; 1397 struct netmap_kring *kring; 1398 struct netmap_ring *ring; 1399 struct netmap_slot *slot; 1400 unsigned int count = 0; 1401 unsigned int minspace; 1402 unsigned int head; 1403 unsigned int lim; 1404 struct mbuf *mhead; 1405 struct mbuf *mf; 1406 int nmbuf_bytes; 1407 uint8_t *nmbuf; 1408 1409 if (!PTNET_Q_TRYLOCK(pq)) { 1410 /* We failed to acquire the lock, schedule the taskqueue. */ 1411 nm_prlim(1, "Deferring TX work"); 1412 if (may_resched) { 1413 taskqueue_enqueue(pq->taskq, &pq->task); 1414 } 1415 1416 return 0; 1417 } 1418 1419 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 1420 PTNET_Q_UNLOCK(pq); 1421 nm_prlim(1, "Interface is down"); 1422 return ENETDOWN; 1423 } 1424 1425 atok = pq->atok; 1426 ktoa = pq->ktoa; 1427 kring = na->tx_rings[pq->kring_id]; 1428 ring = kring->ring; 1429 lim = kring->nkr_num_slots - 1; 1430 head = ring->head; 1431 minspace = sc->min_tx_space; 1432 1433 while (count < budget) { 1434 if (PTNET_TX_NOSPACE(head, kring, minspace)) { 1435 /* We ran out of slot, let's see if the host has 1436 * freed up some, by reading hwcur and hwtail from 1437 * the CSB. */ 1438 ptnet_sync_tail(ktoa, kring); 1439 1440 if (PTNET_TX_NOSPACE(head, kring, minspace)) { 1441 /* Still no slots available. Reactivate the 1442 * interrupts so that we can be notified 1443 * when some free slots are made available by 1444 * the host. */ 1445 atok->appl_need_kick = 1; 1446 1447 /* Double check. We need a full barrier to 1448 * prevent the store to atok->appl_need_kick 1449 * to be reordered with the load from 1450 * ktoa->hwcur and ktoa->hwtail (store-load 1451 * barrier). */ 1452 nm_stld_barrier(); 1453 ptnet_sync_tail(ktoa, kring); 1454 if (likely(PTNET_TX_NOSPACE(head, kring, 1455 minspace))) { 1456 break; 1457 } 1458 1459 nm_prlim(1, "Found more slots by doublecheck"); 1460 /* More slots were freed before reactivating 1461 * the interrupts. */ 1462 atok->appl_need_kick = 0; 1463 } 1464 } 1465 1466 mhead = drbr_peek(ifp, pq->bufring); 1467 if (!mhead) { 1468 break; 1469 } 1470 1471 /* Initialize transmission state variables. */ 1472 slot = ring->slot + head; 1473 nmbuf = NMB(na, slot); 1474 nmbuf_bytes = 0; 1475 1476 /* If needed, prepare the virtio-net header at the beginning 1477 * of the first slot. */ 1478 if (have_vnet_hdr) { 1479 struct virtio_net_hdr *vh = 1480 (struct virtio_net_hdr *)nmbuf; 1481 1482 /* For performance, we could replace this memset() with 1483 * two 8-bytes-wide writes. */ 1484 memset(nmbuf, 0, PTNET_HDR_SIZE); 1485 if (mhead->m_pkthdr.csum_flags & PTNET_ALL_OFFLOAD) { 1486 mhead = virtio_net_tx_offload(ifp, mhead, false, 1487 vh); 1488 if (unlikely(!mhead)) { 1489 /* Packet dropped because errors 1490 * occurred while preparing the vnet 1491 * header. Let's go ahead with the next 1492 * packet. */ 1493 pq->stats.errors ++; 1494 drbr_advance(ifp, pq->bufring); 1495 continue; 1496 } 1497 } 1498 nm_prdis(1, "%s: [csum_flags %lX] vnet hdr: flags %x " 1499 "csum_start %u csum_ofs %u hdr_len = %u " 1500 "gso_size %u gso_type %x", __func__, 1501 mhead->m_pkthdr.csum_flags, vh->flags, 1502 vh->csum_start, vh->csum_offset, vh->hdr_len, 1503 vh->gso_size, vh->gso_type); 1504 1505 nmbuf += PTNET_HDR_SIZE; 1506 nmbuf_bytes += PTNET_HDR_SIZE; 1507 } 1508 1509 for (mf = mhead; mf; mf = mf->m_next) { 1510 uint8_t *mdata = mf->m_data; 1511 int mlen = mf->m_len; 1512 1513 for (;;) { 1514 int copy = NETMAP_BUF_SIZE(na) - nmbuf_bytes; 1515 1516 if (mlen < copy) { 1517 copy = mlen; 1518 } 1519 memcpy(nmbuf, mdata, copy); 1520 1521 mdata += copy; 1522 mlen -= copy; 1523 nmbuf += copy; 1524 nmbuf_bytes += copy; 1525 1526 if (!mlen) { 1527 break; 1528 } 1529 1530 slot->len = nmbuf_bytes; 1531 slot->flags = NS_MOREFRAG; 1532 1533 head = nm_next(head, lim); 1534 KASSERT(head != ring->tail, 1535 ("Unexpectedly run out of TX space")); 1536 slot = ring->slot + head; 1537 nmbuf = NMB(na, slot); 1538 nmbuf_bytes = 0; 1539 } 1540 } 1541 1542 /* Complete last slot and update head. */ 1543 slot->len = nmbuf_bytes; 1544 slot->flags = 0; 1545 head = nm_next(head, lim); 1546 1547 /* Consume the packet just processed. */ 1548 drbr_advance(ifp, pq->bufring); 1549 1550 /* Copy the packet to listeners. */ 1551 ETHER_BPF_MTAP(ifp, mhead); 1552 1553 pq->stats.packets ++; 1554 pq->stats.bytes += mhead->m_pkthdr.len; 1555 if (mhead->m_flags & M_MCAST) { 1556 pq->stats.mcasts ++; 1557 } 1558 1559 m_freem(mhead); 1560 1561 count ++; 1562 if (++batch_count == PTNET_TX_BATCH) { 1563 ptnet_ring_update(pq, kring, head, NAF_FORCE_RECLAIM); 1564 batch_count = 0; 1565 } 1566 } 1567 1568 if (batch_count) { 1569 ptnet_ring_update(pq, kring, head, NAF_FORCE_RECLAIM); 1570 } 1571 1572 if (count >= budget && may_resched) { 1573 DBG(nm_prlim(1, "out of budget: resched, %d mbufs pending\n", 1574 drbr_inuse(ifp, pq->bufring))); 1575 taskqueue_enqueue(pq->taskq, &pq->task); 1576 } 1577 1578 PTNET_Q_UNLOCK(pq); 1579 1580 return count; 1581 } 1582 1583 static int 1584 ptnet_transmit(if_t ifp, struct mbuf *m) 1585 { 1586 struct ptnet_softc *sc = if_getsoftc(ifp); 1587 struct ptnet_queue *pq; 1588 unsigned int queue_idx; 1589 int err; 1590 1591 DBG(device_printf(sc->dev, "transmit %p\n", m)); 1592 1593 /* Insert 802.1Q header if needed. */ 1594 if (m->m_flags & M_VLANTAG) { 1595 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1596 if (m == NULL) { 1597 return ENOBUFS; 1598 } 1599 m->m_flags &= ~M_VLANTAG; 1600 } 1601 1602 /* Get the flow-id if available. */ 1603 queue_idx = (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) ? 1604 m->m_pkthdr.flowid : curcpu; 1605 1606 if (unlikely(queue_idx >= sc->num_tx_rings)) { 1607 queue_idx %= sc->num_tx_rings; 1608 } 1609 1610 pq = sc->queues + queue_idx; 1611 1612 err = drbr_enqueue(ifp, pq->bufring, m); 1613 if (err) { 1614 /* ENOBUFS when the bufring is full */ 1615 nm_prlim(1, "%s: drbr_enqueue() failed %d\n", 1616 __func__, err); 1617 pq->stats.errors ++; 1618 return err; 1619 } 1620 1621 if (ifp->if_capenable & IFCAP_POLLING) { 1622 /* If polling is on, the transmit queues will be 1623 * drained by the poller. */ 1624 return 0; 1625 } 1626 1627 err = ptnet_drain_transmit_queue(pq, PTNET_TX_BUDGET, true); 1628 1629 return (err < 0) ? err : 0; 1630 } 1631 1632 static unsigned int 1633 ptnet_rx_discard(struct netmap_kring *kring, unsigned int head) 1634 { 1635 struct netmap_ring *ring = kring->ring; 1636 struct netmap_slot *slot = ring->slot + head; 1637 1638 for (;;) { 1639 head = nm_next(head, kring->nkr_num_slots - 1); 1640 if (!(slot->flags & NS_MOREFRAG) || head == ring->tail) { 1641 break; 1642 } 1643 slot = ring->slot + head; 1644 } 1645 1646 return head; 1647 } 1648 1649 static inline struct mbuf * 1650 ptnet_rx_slot(struct mbuf *mtail, uint8_t *nmbuf, unsigned int nmbuf_len) 1651 { 1652 uint8_t *mdata = mtod(mtail, uint8_t *) + mtail->m_len; 1653 1654 do { 1655 unsigned int copy; 1656 1657 if (mtail->m_len == MCLBYTES) { 1658 struct mbuf *mf; 1659 1660 mf = m_getcl(M_NOWAIT, MT_DATA, 0); 1661 if (unlikely(!mf)) { 1662 return NULL; 1663 } 1664 1665 mtail->m_next = mf; 1666 mtail = mf; 1667 mdata = mtod(mtail, uint8_t *); 1668 mtail->m_len = 0; 1669 } 1670 1671 copy = MCLBYTES - mtail->m_len; 1672 if (nmbuf_len < copy) { 1673 copy = nmbuf_len; 1674 } 1675 1676 memcpy(mdata, nmbuf, copy); 1677 1678 nmbuf += copy; 1679 nmbuf_len -= copy; 1680 mdata += copy; 1681 mtail->m_len += copy; 1682 } while (nmbuf_len); 1683 1684 return mtail; 1685 } 1686 1687 static int 1688 ptnet_rx_eof(struct ptnet_queue *pq, unsigned int budget, bool may_resched) 1689 { 1690 struct ptnet_softc *sc = pq->sc; 1691 bool have_vnet_hdr = sc->vnet_hdr_len; 1692 struct nm_csb_atok *atok = pq->atok; 1693 struct nm_csb_ktoa *ktoa = pq->ktoa; 1694 struct netmap_adapter *na = &sc->ptna->dr.up; 1695 struct netmap_kring *kring = na->rx_rings[pq->kring_id]; 1696 struct netmap_ring *ring = kring->ring; 1697 unsigned int const lim = kring->nkr_num_slots - 1; 1698 unsigned int batch_count = 0; 1699 if_t ifp = sc->ifp; 1700 unsigned int count = 0; 1701 uint32_t head; 1702 1703 PTNET_Q_LOCK(pq); 1704 1705 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 1706 goto unlock; 1707 } 1708 1709 kring->nr_kflags &= ~NKR_PENDINTR; 1710 1711 head = ring->head; 1712 while (count < budget) { 1713 uint32_t prev_head = head; 1714 struct mbuf *mhead, *mtail; 1715 struct virtio_net_hdr *vh; 1716 struct netmap_slot *slot; 1717 unsigned int nmbuf_len; 1718 uint8_t *nmbuf; 1719 int deliver = 1; /* the mbuf to the network stack. */ 1720 host_sync: 1721 if (head == ring->tail) { 1722 /* We ran out of slot, let's see if the host has 1723 * added some, by reading hwcur and hwtail from 1724 * the CSB. */ 1725 ptnet_sync_tail(ktoa, kring); 1726 1727 if (head == ring->tail) { 1728 /* Still no slots available. Reactivate 1729 * interrupts as they were disabled by the 1730 * host thread right before issuing the 1731 * last interrupt. */ 1732 atok->appl_need_kick = 1; 1733 1734 /* Double check for more completed RX slots. 1735 * We need a full barrier to prevent the store 1736 * to atok->appl_need_kick to be reordered with 1737 * the load from ktoa->hwcur and ktoa->hwtail 1738 * (store-load barrier). */ 1739 nm_stld_barrier(); 1740 ptnet_sync_tail(ktoa, kring); 1741 if (likely(head == ring->tail)) { 1742 break; 1743 } 1744 atok->appl_need_kick = 0; 1745 } 1746 } 1747 1748 /* Initialize ring state variables, possibly grabbing the 1749 * virtio-net header. */ 1750 slot = ring->slot + head; 1751 nmbuf = NMB(na, slot); 1752 nmbuf_len = slot->len; 1753 1754 vh = (struct virtio_net_hdr *)nmbuf; 1755 if (have_vnet_hdr) { 1756 if (unlikely(nmbuf_len < PTNET_HDR_SIZE)) { 1757 /* There is no good reason why host should 1758 * put the header in multiple netmap slots. 1759 * If this is the case, discard. */ 1760 nm_prlim(1, "Fragmented vnet-hdr: dropping"); 1761 head = ptnet_rx_discard(kring, head); 1762 pq->stats.iqdrops ++; 1763 deliver = 0; 1764 goto skip; 1765 } 1766 nm_prdis(1, "%s: vnet hdr: flags %x csum_start %u " 1767 "csum_ofs %u hdr_len = %u gso_size %u " 1768 "gso_type %x", __func__, vh->flags, 1769 vh->csum_start, vh->csum_offset, vh->hdr_len, 1770 vh->gso_size, vh->gso_type); 1771 nmbuf += PTNET_HDR_SIZE; 1772 nmbuf_len -= PTNET_HDR_SIZE; 1773 } 1774 1775 /* Allocate the head of a new mbuf chain. 1776 * We use m_getcl() to allocate an mbuf with standard cluster 1777 * size (MCLBYTES). In the future we could use m_getjcl() 1778 * to choose different sizes. */ 1779 mhead = mtail = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1780 if (unlikely(mhead == NULL)) { 1781 device_printf(sc->dev, "%s: failed to allocate mbuf " 1782 "head\n", __func__); 1783 pq->stats.errors ++; 1784 break; 1785 } 1786 1787 /* Initialize the mbuf state variables. */ 1788 mhead->m_pkthdr.len = nmbuf_len; 1789 mtail->m_len = 0; 1790 1791 /* Scan all the netmap slots containing the current packet. */ 1792 for (;;) { 1793 DBG(device_printf(sc->dev, "%s: h %u t %u rcv frag " 1794 "len %u, flags %u\n", __func__, 1795 head, ring->tail, slot->len, 1796 slot->flags)); 1797 1798 mtail = ptnet_rx_slot(mtail, nmbuf, nmbuf_len); 1799 if (unlikely(!mtail)) { 1800 /* Ouch. We ran out of memory while processing 1801 * a packet. We have to restore the previous 1802 * head position, free the mbuf chain, and 1803 * schedule the taskqueue to give the packet 1804 * another chance. */ 1805 device_printf(sc->dev, "%s: failed to allocate" 1806 " mbuf frag, reset head %u --> %u\n", 1807 __func__, head, prev_head); 1808 head = prev_head; 1809 m_freem(mhead); 1810 pq->stats.errors ++; 1811 if (may_resched) { 1812 taskqueue_enqueue(pq->taskq, 1813 &pq->task); 1814 } 1815 goto escape; 1816 } 1817 1818 /* We have to increment head irrespective of the 1819 * NS_MOREFRAG being set or not. */ 1820 head = nm_next(head, lim); 1821 1822 if (!(slot->flags & NS_MOREFRAG)) { 1823 break; 1824 } 1825 1826 if (unlikely(head == ring->tail)) { 1827 /* The very last slot prepared by the host has 1828 * the NS_MOREFRAG set. Drop it and continue 1829 * the outer cycle (to do the double-check). */ 1830 nm_prlim(1, "Incomplete packet: dropping"); 1831 m_freem(mhead); 1832 pq->stats.iqdrops ++; 1833 goto host_sync; 1834 } 1835 1836 slot = ring->slot + head; 1837 nmbuf = NMB(na, slot); 1838 nmbuf_len = slot->len; 1839 mhead->m_pkthdr.len += nmbuf_len; 1840 } 1841 1842 mhead->m_pkthdr.rcvif = ifp; 1843 mhead->m_pkthdr.csum_flags = 0; 1844 1845 /* Store the queue idx in the packet header. */ 1846 mhead->m_pkthdr.flowid = pq->kring_id; 1847 M_HASHTYPE_SET(mhead, M_HASHTYPE_OPAQUE); 1848 1849 if (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) { 1850 struct ether_header *eh; 1851 1852 eh = mtod(mhead, struct ether_header *); 1853 if (eh->ether_type == htons(ETHERTYPE_VLAN)) { 1854 ptnet_vlan_tag_remove(mhead); 1855 /* 1856 * With the 802.1Q header removed, update the 1857 * checksum starting location accordingly. 1858 */ 1859 if (vh->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) 1860 vh->csum_start -= ETHER_VLAN_ENCAP_LEN; 1861 } 1862 } 1863 1864 if (unlikely(have_vnet_hdr && virtio_net_rx_csum(mhead, vh))) { 1865 m_freem(mhead); 1866 nm_prlim(1, "Csum offload error: dropping"); 1867 pq->stats.iqdrops ++; 1868 deliver = 0; 1869 } 1870 1871 skip: 1872 count ++; 1873 if (++batch_count >= PTNET_RX_BATCH) { 1874 /* Some packets have been (or will be) pushed to the network 1875 * stack. We need to update the CSB to tell the host about 1876 * the new ring->cur and ring->head (RX buffer refill). */ 1877 ptnet_ring_update(pq, kring, head, NAF_FORCE_READ); 1878 batch_count = 0; 1879 } 1880 1881 if (likely(deliver)) { 1882 pq->stats.packets ++; 1883 pq->stats.bytes += mhead->m_pkthdr.len; 1884 1885 PTNET_Q_UNLOCK(pq); 1886 (*ifp->if_input)(ifp, mhead); 1887 PTNET_Q_LOCK(pq); 1888 /* The ring->head index (and related indices) are 1889 * updated under pq lock by ptnet_ring_update(). 1890 * Since we dropped the lock to call if_input(), we 1891 * must reload ring->head and restart processing the 1892 * ring from there. */ 1893 head = ring->head; 1894 1895 if (unlikely(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 1896 /* The interface has gone down while we didn't 1897 * have the lock. Stop any processing and exit. */ 1898 goto unlock; 1899 } 1900 } 1901 } 1902 escape: 1903 if (batch_count) { 1904 ptnet_ring_update(pq, kring, head, NAF_FORCE_READ); 1905 1906 } 1907 1908 if (count >= budget && may_resched) { 1909 /* If we ran out of budget or the double-check found new 1910 * slots to process, schedule the taskqueue. */ 1911 DBG(nm_prlim(1, "out of budget: resched h %u t %u\n", 1912 head, ring->tail)); 1913 taskqueue_enqueue(pq->taskq, &pq->task); 1914 } 1915 unlock: 1916 PTNET_Q_UNLOCK(pq); 1917 1918 return count; 1919 } 1920 1921 static void 1922 ptnet_rx_task(void *context, int pending) 1923 { 1924 struct ptnet_queue *pq = context; 1925 1926 DBG(nm_prlim(1, "%s: pq #%u\n", __func__, pq->kring_id)); 1927 ptnet_rx_eof(pq, PTNET_RX_BUDGET, true); 1928 } 1929 1930 static void 1931 ptnet_tx_task(void *context, int pending) 1932 { 1933 struct ptnet_queue *pq = context; 1934 1935 DBG(nm_prlim(1, "%s: pq #%u\n", __func__, pq->kring_id)); 1936 ptnet_drain_transmit_queue(pq, PTNET_TX_BUDGET, true); 1937 } 1938 1939 #ifdef DEVICE_POLLING 1940 /* We don't need to handle differently POLL_AND_CHECK_STATUS and 1941 * POLL_ONLY, since we don't have an Interrupt Status Register. */ 1942 static int 1943 ptnet_poll(if_t ifp, enum poll_cmd cmd, int budget) 1944 { 1945 struct ptnet_softc *sc = if_getsoftc(ifp); 1946 unsigned int queue_budget; 1947 unsigned int count = 0; 1948 bool borrow = false; 1949 int i; 1950 1951 KASSERT(sc->num_rings > 0, ("Found no queues in while polling ptnet")); 1952 queue_budget = MAX(budget / sc->num_rings, 1); 1953 nm_prlim(1, "Per-queue budget is %d", queue_budget); 1954 1955 while (budget) { 1956 unsigned int rcnt = 0; 1957 1958 for (i = 0; i < sc->num_rings; i++) { 1959 struct ptnet_queue *pq = sc->queues + i; 1960 1961 if (borrow) { 1962 queue_budget = MIN(queue_budget, budget); 1963 if (queue_budget == 0) { 1964 break; 1965 } 1966 } 1967 1968 if (i < sc->num_tx_rings) { 1969 rcnt += ptnet_drain_transmit_queue(pq, 1970 queue_budget, false); 1971 } else { 1972 rcnt += ptnet_rx_eof(pq, queue_budget, 1973 false); 1974 } 1975 } 1976 1977 if (!rcnt) { 1978 /* A scan of the queues gave no result, we can 1979 * stop here. */ 1980 break; 1981 } 1982 1983 if (rcnt > budget) { 1984 /* This may happen when initial budget < sc->num_rings, 1985 * since one packet budget is given to each queue 1986 * anyway. Just pretend we didn't eat "so much". */ 1987 rcnt = budget; 1988 } 1989 count += rcnt; 1990 budget -= rcnt; 1991 borrow = true; 1992 } 1993 1994 1995 return count; 1996 } 1997 #endif /* DEVICE_POLLING */ 1998 #endif /* WITH_PTNETMAP */ 1999