1 /*- 2 * Copyright (c) 2004-2006 Kip Macy 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, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/sockio.h> 34 #include <sys/mbuf.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/kernel.h> 38 #include <sys/socket.h> 39 #include <sys/sysctl.h> 40 #include <sys/queue.h> 41 #include <sys/lock.h> 42 #include <sys/sx.h> 43 44 #include <net/if.h> 45 #include <net/if_arp.h> 46 #include <net/ethernet.h> 47 #include <net/if_dl.h> 48 #include <net/if_media.h> 49 50 #include <net/bpf.h> 51 52 #include <net/if_types.h> 53 #include <net/if.h> 54 55 #include <netinet/in_systm.h> 56 #include <netinet/in.h> 57 #include <netinet/ip.h> 58 #include <netinet/if_ether.h> 59 #if __FreeBSD_version >= 700000 60 #include <netinet/tcp.h> 61 #include <netinet/tcp_lro.h> 62 #endif 63 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 67 #include <machine/clock.h> /* for DELAY */ 68 #include <machine/bus.h> 69 #include <machine/resource.h> 70 #include <machine/frame.h> 71 #include <machine/vmparam.h> 72 73 #include <sys/bus.h> 74 #include <sys/rman.h> 75 76 #include <machine/intr_machdep.h> 77 78 #include <machine/xen/xen-os.h> 79 #include <machine/xen/xenfunc.h> 80 #include <xen/hypervisor.h> 81 #include <xen/xen_intr.h> 82 #include <xen/evtchn.h> 83 #include <xen/gnttab.h> 84 #include <xen/interface/memory.h> 85 #include <xen/interface/io/netif.h> 86 #include <xen/xenbus/xenbusvar.h> 87 88 #include <dev/xen/netfront/mbufq.h> 89 90 #include "xenbus_if.h" 91 92 #define XN_CSUM_FEATURES (CSUM_TCP | CSUM_UDP) 93 94 #define GRANT_INVALID_REF 0 95 96 #define NET_TX_RING_SIZE __RING_SIZE((netif_tx_sring_t *)0, PAGE_SIZE) 97 #define NET_RX_RING_SIZE __RING_SIZE((netif_rx_sring_t *)0, PAGE_SIZE) 98 99 #if __FreeBSD_version >= 700000 100 /* 101 * Should the driver do LRO on the RX end 102 * this can be toggled on the fly, but the 103 * interface must be reset (down/up) for it 104 * to take effect. 105 */ 106 static int xn_enable_lro = 1; 107 TUNABLE_INT("hw.xn.enable_lro", &xn_enable_lro); 108 #else 109 110 #define IFCAP_TSO4 0 111 #define CSUM_TSO 0 112 113 #endif 114 115 #ifdef CONFIG_XEN 116 static int MODPARM_rx_copy = 0; 117 module_param_named(rx_copy, MODPARM_rx_copy, bool, 0); 118 MODULE_PARM_DESC(rx_copy, "Copy packets from network card (rather than flip)"); 119 static int MODPARM_rx_flip = 0; 120 module_param_named(rx_flip, MODPARM_rx_flip, bool, 0); 121 MODULE_PARM_DESC(rx_flip, "Flip packets from network card (rather than copy)"); 122 #else 123 static const int MODPARM_rx_copy = 1; 124 static const int MODPARM_rx_flip = 0; 125 #endif 126 127 #define MAX_SKB_FRAGS (65536/PAGE_SIZE + 2) 128 #define RX_COPY_THRESHOLD 256 129 130 #define net_ratelimit() 0 131 132 struct netfront_info; 133 struct netfront_rx_info; 134 135 static void xn_txeof(struct netfront_info *); 136 static void xn_rxeof(struct netfront_info *); 137 static void network_alloc_rx_buffers(struct netfront_info *); 138 139 static void xn_tick_locked(struct netfront_info *); 140 static void xn_tick(void *); 141 142 static void xn_intr(void *); 143 static void xn_start_locked(struct ifnet *); 144 static void xn_start(struct ifnet *); 145 static int xn_ioctl(struct ifnet *, u_long, caddr_t); 146 static void xn_ifinit_locked(struct netfront_info *); 147 static void xn_ifinit(void *); 148 static void xn_stop(struct netfront_info *); 149 #ifdef notyet 150 static void xn_watchdog(struct ifnet *); 151 #endif 152 153 static void show_device(struct netfront_info *sc); 154 #ifdef notyet 155 static void netfront_closing(device_t dev); 156 #endif 157 static void netif_free(struct netfront_info *info); 158 static int netfront_detach(device_t dev); 159 160 static int talk_to_backend(device_t dev, struct netfront_info *info); 161 static int create_netdev(device_t dev); 162 static void netif_disconnect_backend(struct netfront_info *info); 163 static int setup_device(device_t dev, struct netfront_info *info); 164 static void end_access(int ref, void *page); 165 166 static int xn_ifmedia_upd(struct ifnet *ifp); 167 static void xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr); 168 169 /* Xenolinux helper functions */ 170 int network_connect(struct netfront_info *); 171 172 static void xn_free_rx_ring(struct netfront_info *); 173 174 static void xn_free_tx_ring(struct netfront_info *); 175 176 static int xennet_get_responses(struct netfront_info *np, 177 struct netfront_rx_info *rinfo, RING_IDX rp, struct mbuf **list, 178 int *pages_flipped_p); 179 180 #define virt_to_mfn(x) (vtomach(x) >> PAGE_SHIFT) 181 182 #define INVALID_P2M_ENTRY (~0UL) 183 184 /* 185 * Mbuf pointers. We need these to keep track of the virtual addresses 186 * of our mbuf chains since we can only convert from virtual to physical, 187 * not the other way around. The size must track the free index arrays. 188 */ 189 struct xn_chain_data { 190 struct mbuf *xn_tx_chain[NET_TX_RING_SIZE+1]; 191 int xn_tx_chain_cnt; 192 struct mbuf *xn_rx_chain[NET_RX_RING_SIZE+1]; 193 }; 194 195 196 struct net_device_stats 197 { 198 u_long rx_packets; /* total packets received */ 199 u_long tx_packets; /* total packets transmitted */ 200 u_long rx_bytes; /* total bytes received */ 201 u_long tx_bytes; /* total bytes transmitted */ 202 u_long rx_errors; /* bad packets received */ 203 u_long tx_errors; /* packet transmit problems */ 204 u_long rx_dropped; /* no space in linux buffers */ 205 u_long tx_dropped; /* no space available in linux */ 206 u_long multicast; /* multicast packets received */ 207 u_long collisions; 208 209 /* detailed rx_errors: */ 210 u_long rx_length_errors; 211 u_long rx_over_errors; /* receiver ring buff overflow */ 212 u_long rx_crc_errors; /* recved pkt with crc error */ 213 u_long rx_frame_errors; /* recv'd frame alignment error */ 214 u_long rx_fifo_errors; /* recv'r fifo overrun */ 215 u_long rx_missed_errors; /* receiver missed packet */ 216 217 /* detailed tx_errors */ 218 u_long tx_aborted_errors; 219 u_long tx_carrier_errors; 220 u_long tx_fifo_errors; 221 u_long tx_heartbeat_errors; 222 u_long tx_window_errors; 223 224 /* for cslip etc */ 225 u_long rx_compressed; 226 u_long tx_compressed; 227 }; 228 229 struct netfront_info { 230 231 struct ifnet *xn_ifp; 232 #if __FreeBSD_version >= 700000 233 struct lro_ctrl xn_lro; 234 #endif 235 236 struct net_device_stats stats; 237 u_int tx_full; 238 239 netif_tx_front_ring_t tx; 240 netif_rx_front_ring_t rx; 241 242 struct mtx tx_lock; 243 struct mtx rx_lock; 244 struct mtx sc_lock; 245 246 u_int handle; 247 u_int irq; 248 u_int copying_receiver; 249 u_int carrier; 250 251 /* Receive-ring batched refills. */ 252 #define RX_MIN_TARGET 32 253 #define RX_MAX_TARGET NET_RX_RING_SIZE 254 int rx_min_target; 255 int rx_max_target; 256 int rx_target; 257 258 /* 259 * {tx,rx}_skbs store outstanding skbuffs. The first entry in each 260 * array is an index into a chain of free entries. 261 */ 262 263 grant_ref_t gref_tx_head; 264 grant_ref_t grant_tx_ref[NET_TX_RING_SIZE + 1]; 265 grant_ref_t gref_rx_head; 266 grant_ref_t grant_rx_ref[NET_TX_RING_SIZE + 1]; 267 268 #define TX_MAX_TARGET min(NET_RX_RING_SIZE, 256) 269 device_t xbdev; 270 int tx_ring_ref; 271 int rx_ring_ref; 272 uint8_t mac[ETHER_ADDR_LEN]; 273 struct xn_chain_data xn_cdata; /* mbufs */ 274 struct mbuf_head xn_rx_batch; /* head of the batch queue */ 275 276 int xn_if_flags; 277 struct callout xn_stat_ch; 278 279 u_long rx_pfn_array[NET_RX_RING_SIZE]; 280 multicall_entry_t rx_mcl[NET_RX_RING_SIZE+1]; 281 mmu_update_t rx_mmu[NET_RX_RING_SIZE]; 282 struct ifmedia sc_media; 283 }; 284 285 #define rx_mbufs xn_cdata.xn_rx_chain 286 #define tx_mbufs xn_cdata.xn_tx_chain 287 288 #define XN_LOCK_INIT(_sc, _name) \ 289 mtx_init(&(_sc)->tx_lock, #_name"_tx", "network transmit lock", MTX_DEF); \ 290 mtx_init(&(_sc)->rx_lock, #_name"_rx", "network receive lock", MTX_DEF); \ 291 mtx_init(&(_sc)->sc_lock, #_name"_sc", "netfront softc lock", MTX_DEF) 292 293 #define XN_RX_LOCK(_sc) mtx_lock(&(_sc)->rx_lock) 294 #define XN_RX_UNLOCK(_sc) mtx_unlock(&(_sc)->rx_lock) 295 296 #define XN_TX_LOCK(_sc) mtx_lock(&(_sc)->tx_lock) 297 #define XN_TX_UNLOCK(_sc) mtx_unlock(&(_sc)->tx_lock) 298 299 #define XN_LOCK(_sc) mtx_lock(&(_sc)->sc_lock); 300 #define XN_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_lock); 301 302 #define XN_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_lock, MA_OWNED); 303 #define XN_RX_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->rx_lock, MA_OWNED); 304 #define XN_TX_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->tx_lock, MA_OWNED); 305 #define XN_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->rx_lock); \ 306 mtx_destroy(&(_sc)->tx_lock); \ 307 mtx_destroy(&(_sc)->sc_lock); 308 309 struct netfront_rx_info { 310 struct netif_rx_response rx; 311 struct netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; 312 }; 313 314 #define netfront_carrier_on(netif) ((netif)->carrier = 1) 315 #define netfront_carrier_off(netif) ((netif)->carrier = 0) 316 #define netfront_carrier_ok(netif) ((netif)->carrier) 317 318 /* Access macros for acquiring freeing slots in xn_free_{tx,rx}_idxs[]. */ 319 320 321 322 /* 323 * Access macros for acquiring freeing slots in tx_skbs[]. 324 */ 325 326 static inline void 327 add_id_to_freelist(struct mbuf **list, unsigned short id) 328 { 329 KASSERT(id != 0, ("add_id_to_freelist: the head item (0) must always be free.")); 330 list[id] = list[0]; 331 list[0] = (void *)(u_long)id; 332 } 333 334 static inline unsigned short 335 get_id_from_freelist(struct mbuf **list) 336 { 337 u_int id = (u_int)(u_long)list[0]; 338 KASSERT(id != 0, ("get_id_from_freelist: the head item (0) must always remain free.")); 339 list[0] = list[id]; 340 return (id); 341 } 342 343 static inline int 344 xennet_rxidx(RING_IDX idx) 345 { 346 return idx & (NET_RX_RING_SIZE - 1); 347 } 348 349 static inline struct mbuf * 350 xennet_get_rx_mbuf(struct netfront_info *np, 351 RING_IDX ri) 352 { 353 int i = xennet_rxidx(ri); 354 struct mbuf *m; 355 356 m = np->rx_mbufs[i]; 357 np->rx_mbufs[i] = NULL; 358 return (m); 359 } 360 361 static inline grant_ref_t 362 xennet_get_rx_ref(struct netfront_info *np, RING_IDX ri) 363 { 364 int i = xennet_rxidx(ri); 365 grant_ref_t ref = np->grant_rx_ref[i]; 366 np->grant_rx_ref[i] = GRANT_INVALID_REF; 367 return ref; 368 } 369 370 #define IPRINTK(fmt, args...) \ 371 printf("[XEN] " fmt, ##args) 372 #ifdef INVARIANTS 373 #define WPRINTK(fmt, args...) \ 374 printf("[XEN] " fmt, ##args) 375 #else 376 #define WPRINTK(fmt, args...) 377 #endif 378 #ifdef DEBUG 379 #define DPRINTK(fmt, args...) \ 380 printf("[XEN] %s: " fmt, __func__, ##args) 381 #else 382 #define DPRINTK(fmt, args...) 383 #endif 384 385 /** 386 * Read the 'mac' node at the given device's node in the store, and parse that 387 * as colon-separated octets, placing result the given mac array. mac must be 388 * a preallocated array of length ETH_ALEN (as declared in linux/if_ether.h). 389 * Return 0 on success, or errno on error. 390 */ 391 static int 392 xen_net_read_mac(device_t dev, uint8_t mac[]) 393 { 394 int error, i; 395 char *s, *e, *macstr; 396 397 error = xenbus_read(XBT_NIL, xenbus_get_node(dev), "mac", NULL, 398 (void **) &macstr); 399 if (error) 400 return (error); 401 402 s = macstr; 403 for (i = 0; i < ETHER_ADDR_LEN; i++) { 404 mac[i] = strtoul(s, &e, 16); 405 if (s == e || (e[0] != ':' && e[0] != 0)) { 406 free(macstr, M_DEVBUF); 407 return (ENOENT); 408 } 409 s = &e[1]; 410 } 411 free(macstr, M_DEVBUF); 412 return (0); 413 } 414 415 /** 416 * Entry point to this code when a new device is created. Allocate the basic 417 * structures and the ring buffers for communication with the backend, and 418 * inform the backend of the appropriate details for those. Switch to 419 * Connected state. 420 */ 421 static int 422 netfront_probe(device_t dev) 423 { 424 425 if (!strcmp(xenbus_get_type(dev), "vif")) { 426 device_set_desc(dev, "Virtual Network Interface"); 427 return (0); 428 } 429 430 return (ENXIO); 431 } 432 433 static int 434 netfront_attach(device_t dev) 435 { 436 int err; 437 438 err = create_netdev(dev); 439 if (err) { 440 xenbus_dev_fatal(dev, err, "creating netdev"); 441 return err; 442 } 443 444 #if __FreeBSD_version >= 700000 445 SYSCTL_ADD_INT(device_get_sysctl_ctx(dev), 446 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 447 OID_AUTO, "enable_lro", CTLTYPE_INT|CTLFLAG_RW, 448 &xn_enable_lro, 0, "Large Receive Offload"); 449 #endif 450 451 return 0; 452 } 453 454 455 /** 456 * We are reconnecting to the backend, due to a suspend/resume, or a backend 457 * driver restart. We tear down our netif structure and recreate it, but 458 * leave the device-layer structures intact so that this is transparent to the 459 * rest of the kernel. 460 */ 461 static int 462 netfront_resume(device_t dev) 463 { 464 struct netfront_info *info = device_get_softc(dev); 465 466 netif_disconnect_backend(info); 467 return (0); 468 } 469 470 471 /* Common code used when first setting up, and when resuming. */ 472 static int 473 talk_to_backend(device_t dev, struct netfront_info *info) 474 { 475 const char *message; 476 struct xenbus_transaction xbt; 477 const char *node = xenbus_get_node(dev); 478 int err; 479 480 err = xen_net_read_mac(dev, info->mac); 481 if (err) { 482 xenbus_dev_fatal(dev, err, "parsing %s/mac", node); 483 goto out; 484 } 485 486 /* Create shared ring, alloc event channel. */ 487 err = setup_device(dev, info); 488 if (err) 489 goto out; 490 491 again: 492 err = xenbus_transaction_start(&xbt); 493 if (err) { 494 xenbus_dev_fatal(dev, err, "starting transaction"); 495 goto destroy_ring; 496 } 497 err = xenbus_printf(xbt, node, "tx-ring-ref","%u", 498 info->tx_ring_ref); 499 if (err) { 500 message = "writing tx ring-ref"; 501 goto abort_transaction; 502 } 503 err = xenbus_printf(xbt, node, "rx-ring-ref","%u", 504 info->rx_ring_ref); 505 if (err) { 506 message = "writing rx ring-ref"; 507 goto abort_transaction; 508 } 509 err = xenbus_printf(xbt, node, 510 "event-channel", "%u", irq_to_evtchn_port(info->irq)); 511 if (err) { 512 message = "writing event-channel"; 513 goto abort_transaction; 514 } 515 err = xenbus_printf(xbt, node, "request-rx-copy", "%u", 516 info->copying_receiver); 517 if (err) { 518 message = "writing request-rx-copy"; 519 goto abort_transaction; 520 } 521 err = xenbus_printf(xbt, node, "feature-rx-notify", "%d", 1); 522 if (err) { 523 message = "writing feature-rx-notify"; 524 goto abort_transaction; 525 } 526 err = xenbus_printf(xbt, node, "feature-sg", "%d", 1); 527 if (err) { 528 message = "writing feature-sg"; 529 goto abort_transaction; 530 } 531 #if __FreeBSD_version >= 700000 532 err = xenbus_printf(xbt, node, "feature-gso-tcpv4", "%d", 1); 533 if (err) { 534 message = "writing feature-gso-tcpv4"; 535 goto abort_transaction; 536 } 537 #endif 538 539 err = xenbus_transaction_end(xbt, 0); 540 if (err) { 541 if (err == EAGAIN) 542 goto again; 543 xenbus_dev_fatal(dev, err, "completing transaction"); 544 goto destroy_ring; 545 } 546 547 return 0; 548 549 abort_transaction: 550 xenbus_transaction_end(xbt, 1); 551 xenbus_dev_fatal(dev, err, "%s", message); 552 destroy_ring: 553 netif_free(info); 554 out: 555 return err; 556 } 557 558 559 static int 560 setup_device(device_t dev, struct netfront_info *info) 561 { 562 netif_tx_sring_t *txs; 563 netif_rx_sring_t *rxs; 564 int error; 565 struct ifnet *ifp; 566 567 ifp = info->xn_ifp; 568 569 info->tx_ring_ref = GRANT_INVALID_REF; 570 info->rx_ring_ref = GRANT_INVALID_REF; 571 info->rx.sring = NULL; 572 info->tx.sring = NULL; 573 info->irq = 0; 574 575 txs = (netif_tx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO); 576 if (!txs) { 577 error = ENOMEM; 578 xenbus_dev_fatal(dev, error, "allocating tx ring page"); 579 goto fail; 580 } 581 SHARED_RING_INIT(txs); 582 FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE); 583 error = xenbus_grant_ring(dev, virt_to_mfn(txs), &info->tx_ring_ref); 584 if (error) 585 goto fail; 586 587 rxs = (netif_rx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO); 588 if (!rxs) { 589 error = ENOMEM; 590 xenbus_dev_fatal(dev, error, "allocating rx ring page"); 591 goto fail; 592 } 593 SHARED_RING_INIT(rxs); 594 FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE); 595 596 error = xenbus_grant_ring(dev, virt_to_mfn(rxs), &info->rx_ring_ref); 597 if (error) 598 goto fail; 599 600 error = bind_listening_port_to_irqhandler(xenbus_get_otherend_id(dev), 601 "xn", xn_intr, info, INTR_TYPE_NET | INTR_MPSAFE, &info->irq); 602 603 if (error) { 604 xenbus_dev_fatal(dev, error, 605 "bind_evtchn_to_irqhandler failed"); 606 goto fail; 607 } 608 609 show_device(info); 610 611 return (0); 612 613 fail: 614 netif_free(info); 615 return (error); 616 } 617 618 /** 619 * If this interface has an ipv4 address, send an arp for it. This 620 * helps to get the network going again after migrating hosts. 621 */ 622 static void 623 netfront_send_fake_arp(device_t dev, struct netfront_info *info) 624 { 625 struct ifnet *ifp; 626 struct ifaddr *ifa; 627 628 ifp = info->xn_ifp; 629 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 630 if (ifa->ifa_addr->sa_family == AF_INET) { 631 arp_ifinit(ifp, ifa); 632 } 633 } 634 } 635 636 /** 637 * Callback received when the backend's state changes. 638 */ 639 static int 640 netfront_backend_changed(device_t dev, XenbusState newstate) 641 { 642 struct netfront_info *sc = device_get_softc(dev); 643 644 DPRINTK("newstate=%d\n", newstate); 645 646 switch (newstate) { 647 case XenbusStateInitialising: 648 case XenbusStateInitialised: 649 case XenbusStateConnected: 650 case XenbusStateUnknown: 651 case XenbusStateClosed: 652 case XenbusStateReconfigured: 653 case XenbusStateReconfiguring: 654 break; 655 case XenbusStateInitWait: 656 if (xenbus_get_state(dev) != XenbusStateInitialising) 657 break; 658 if (network_connect(sc) != 0) 659 break; 660 xenbus_set_state(dev, XenbusStateConnected); 661 netfront_send_fake_arp(dev, sc); 662 break; 663 case XenbusStateClosing: 664 xenbus_set_state(dev, XenbusStateClosed); 665 break; 666 } 667 return (0); 668 } 669 670 static void 671 xn_free_rx_ring(struct netfront_info *sc) 672 { 673 #if 0 674 int i; 675 676 for (i = 0; i < NET_RX_RING_SIZE; i++) { 677 if (sc->xn_cdata.xn_rx_chain[i] != NULL) { 678 m_freem(sc->xn_cdata.xn_rx_chain[i]); 679 sc->xn_cdata.xn_rx_chain[i] = NULL; 680 } 681 } 682 683 sc->rx.rsp_cons = 0; 684 sc->xn_rx_if->req_prod = 0; 685 sc->xn_rx_if->event = sc->rx.rsp_cons ; 686 #endif 687 } 688 689 static void 690 xn_free_tx_ring(struct netfront_info *sc) 691 { 692 #if 0 693 int i; 694 695 for (i = 0; i < NET_TX_RING_SIZE; i++) { 696 if (sc->xn_cdata.xn_tx_chain[i] != NULL) { 697 m_freem(sc->xn_cdata.xn_tx_chain[i]); 698 sc->xn_cdata.xn_tx_chain[i] = NULL; 699 } 700 } 701 702 return; 703 #endif 704 } 705 706 /* 707 * Do some brief math on the number of descriptors available to 708 * determine how many slots are available. 709 * 710 * Firstly - wouldn't something with RING_FREE_REQUESTS() be more applicable? 711 * Secondly - MAX_SKB_FRAGS is a Linux construct which may not apply here. 712 * Thirdly - it isn't used here anyway; the magic constant '24' is possibly 713 * wrong? 714 * The "2" is presumably to ensure there are also enough slots available for 715 * the ring entries used for "options" (eg, the TSO entry before a packet 716 * is queued); I'm not sure why its 2 and not 1. Perhaps to make sure there's 717 * a "free" node in the tx mbuf list (node 0) to represent the freelist? 718 * 719 * This only figures out whether any xenbus ring descriptors are available; 720 * it doesn't at all reflect how many tx mbuf ring descriptors are also 721 * available. 722 */ 723 static inline int 724 netfront_tx_slot_available(struct netfront_info *np) 725 { 726 return ((np->tx.req_prod_pvt - np->tx.rsp_cons) < 727 (TX_MAX_TARGET - /* MAX_SKB_FRAGS */ 24 - 2)); 728 } 729 static void 730 netif_release_tx_bufs(struct netfront_info *np) 731 { 732 struct mbuf *m; 733 int i; 734 735 for (i = 1; i <= NET_TX_RING_SIZE; i++) { 736 m = np->xn_cdata.xn_tx_chain[i]; 737 738 if (((u_long)m) < KERNBASE) 739 continue; 740 gnttab_grant_foreign_access_ref(np->grant_tx_ref[i], 741 xenbus_get_otherend_id(np->xbdev), 742 virt_to_mfn(mtod(m, vm_offset_t)), 743 GNTMAP_readonly); 744 gnttab_release_grant_reference(&np->gref_tx_head, 745 np->grant_tx_ref[i]); 746 np->grant_tx_ref[i] = GRANT_INVALID_REF; 747 add_id_to_freelist(np->tx_mbufs, i); 748 np->xn_cdata.xn_tx_chain_cnt--; 749 if (np->xn_cdata.xn_tx_chain_cnt < 0) { 750 panic("netif_release_tx_bufs: tx_chain_cnt must be >= 0"); 751 } 752 m_freem(m); 753 } 754 } 755 756 static void 757 network_alloc_rx_buffers(struct netfront_info *sc) 758 { 759 int otherend_id = xenbus_get_otherend_id(sc->xbdev); 760 unsigned short id; 761 struct mbuf *m_new; 762 int i, batch_target, notify; 763 RING_IDX req_prod; 764 struct xen_memory_reservation reservation; 765 grant_ref_t ref; 766 int nr_flips; 767 netif_rx_request_t *req; 768 vm_offset_t vaddr; 769 u_long pfn; 770 771 req_prod = sc->rx.req_prod_pvt; 772 773 if (unlikely(sc->carrier == 0)) 774 return; 775 776 /* 777 * Allocate skbuffs greedily, even though we batch updates to the 778 * receive ring. This creates a less bursty demand on the memory 779 * allocator, so should reduce the chance of failed allocation 780 * requests both for ourself and for other kernel subsystems. 781 */ 782 batch_target = sc->rx_target - (req_prod - sc->rx.rsp_cons); 783 for (i = mbufq_len(&sc->xn_rx_batch); i < batch_target; i++) { 784 MGETHDR(m_new, M_DONTWAIT, MT_DATA); 785 if (m_new == NULL) 786 goto no_mbuf; 787 788 m_cljget(m_new, M_DONTWAIT, MJUMPAGESIZE); 789 if ((m_new->m_flags & M_EXT) == 0) { 790 m_freem(m_new); 791 792 no_mbuf: 793 if (i != 0) 794 goto refill; 795 /* 796 * XXX set timer 797 */ 798 break; 799 } 800 m_new->m_len = m_new->m_pkthdr.len = MJUMPAGESIZE; 801 802 /* queue the mbufs allocated */ 803 mbufq_tail(&sc->xn_rx_batch, m_new); 804 } 805 806 /* Is the batch large enough to be worthwhile? */ 807 if (i < (sc->rx_target/2)) { 808 if (req_prod >sc->rx.sring->req_prod) 809 goto push; 810 return; 811 } 812 /* Adjust floating fill target if we risked running out of buffers. */ 813 if ( ((req_prod - sc->rx.sring->rsp_prod) < (sc->rx_target / 4)) && 814 ((sc->rx_target *= 2) > sc->rx_max_target) ) 815 sc->rx_target = sc->rx_max_target; 816 817 refill: 818 for (nr_flips = i = 0; ; i++) { 819 if ((m_new = mbufq_dequeue(&sc->xn_rx_batch)) == NULL) 820 break; 821 822 m_new->m_ext.ext_arg1 = (vm_paddr_t *)(uintptr_t)( 823 vtophys(m_new->m_ext.ext_buf) >> PAGE_SHIFT); 824 825 id = xennet_rxidx(req_prod + i); 826 827 KASSERT(sc->xn_cdata.xn_rx_chain[id] == NULL, 828 ("non-NULL xm_rx_chain")); 829 sc->xn_cdata.xn_rx_chain[id] = m_new; 830 831 ref = gnttab_claim_grant_reference(&sc->gref_rx_head); 832 KASSERT((short)ref >= 0, ("negative ref")); 833 sc->grant_rx_ref[id] = ref; 834 835 vaddr = mtod(m_new, vm_offset_t); 836 pfn = vtophys(vaddr) >> PAGE_SHIFT; 837 req = RING_GET_REQUEST(&sc->rx, req_prod + i); 838 839 if (sc->copying_receiver == 0) { 840 gnttab_grant_foreign_transfer_ref(ref, 841 otherend_id, pfn); 842 sc->rx_pfn_array[nr_flips] = PFNTOMFN(pfn); 843 if (!xen_feature(XENFEAT_auto_translated_physmap)) { 844 /* Remove this page before passing 845 * back to Xen. 846 */ 847 set_phys_to_machine(pfn, INVALID_P2M_ENTRY); 848 MULTI_update_va_mapping(&sc->rx_mcl[i], 849 vaddr, 0, 0); 850 } 851 nr_flips++; 852 } else { 853 gnttab_grant_foreign_access_ref(ref, 854 otherend_id, 855 PFNTOMFN(pfn), 0); 856 } 857 req->id = id; 858 req->gref = ref; 859 860 sc->rx_pfn_array[i] = 861 vtomach(mtod(m_new,vm_offset_t)) >> PAGE_SHIFT; 862 } 863 864 KASSERT(i, ("no mbufs processed")); /* should have returned earlier */ 865 KASSERT(mbufq_len(&sc->xn_rx_batch) == 0, ("not all mbufs processed")); 866 /* 867 * We may have allocated buffers which have entries outstanding 868 * in the page * update queue -- make sure we flush those first! 869 */ 870 PT_UPDATES_FLUSH(); 871 if (nr_flips != 0) { 872 #ifdef notyet 873 /* Tell the ballon driver what is going on. */ 874 balloon_update_driver_allowance(i); 875 #endif 876 set_xen_guest_handle(reservation.extent_start, sc->rx_pfn_array); 877 reservation.nr_extents = i; 878 reservation.extent_order = 0; 879 reservation.address_bits = 0; 880 reservation.domid = DOMID_SELF; 881 882 if (!xen_feature(XENFEAT_auto_translated_physmap)) { 883 884 /* After all PTEs have been zapped, flush the TLB. */ 885 sc->rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] = 886 UVMF_TLB_FLUSH|UVMF_ALL; 887 888 /* Give away a batch of pages. */ 889 sc->rx_mcl[i].op = __HYPERVISOR_memory_op; 890 sc->rx_mcl[i].args[0] = XENMEM_decrease_reservation; 891 sc->rx_mcl[i].args[1] = (u_long)&reservation; 892 /* Zap PTEs and give away pages in one big multicall. */ 893 (void)HYPERVISOR_multicall(sc->rx_mcl, i+1); 894 895 /* Check return status of HYPERVISOR_dom_mem_op(). */ 896 if (unlikely(sc->rx_mcl[i].result != i)) 897 panic("Unable to reduce memory reservation\n"); 898 } else { 899 if (HYPERVISOR_memory_op( 900 XENMEM_decrease_reservation, &reservation) 901 != i) 902 panic("Unable to reduce memory " 903 "reservation\n"); 904 } 905 } else { 906 wmb(); 907 } 908 909 /* Above is a suitable barrier to ensure backend will see requests. */ 910 sc->rx.req_prod_pvt = req_prod + i; 911 push: 912 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->rx, notify); 913 if (notify) 914 notify_remote_via_irq(sc->irq); 915 } 916 917 static void 918 xn_rxeof(struct netfront_info *np) 919 { 920 struct ifnet *ifp; 921 #if __FreeBSD_version >= 700000 922 struct lro_ctrl *lro = &np->xn_lro; 923 struct lro_entry *queued; 924 #endif 925 struct netfront_rx_info rinfo; 926 struct netif_rx_response *rx = &rinfo.rx; 927 struct netif_extra_info *extras = rinfo.extras; 928 RING_IDX i, rp; 929 multicall_entry_t *mcl; 930 struct mbuf *m; 931 struct mbuf_head rxq, errq; 932 int err, pages_flipped = 0, work_to_do; 933 934 do { 935 XN_RX_LOCK_ASSERT(np); 936 if (!netfront_carrier_ok(np)) 937 return; 938 939 mbufq_init(&errq); 940 mbufq_init(&rxq); 941 942 ifp = np->xn_ifp; 943 944 rp = np->rx.sring->rsp_prod; 945 rmb(); /* Ensure we see queued responses up to 'rp'. */ 946 947 i = np->rx.rsp_cons; 948 while ((i != rp)) { 949 memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx)); 950 memset(extras, 0, sizeof(rinfo.extras)); 951 952 m = NULL; 953 err = xennet_get_responses(np, &rinfo, rp, &m, 954 &pages_flipped); 955 956 if (unlikely(err)) { 957 if (m) 958 mbufq_tail(&errq, m); 959 np->stats.rx_errors++; 960 i = np->rx.rsp_cons; 961 continue; 962 } 963 964 m->m_pkthdr.rcvif = ifp; 965 if ( rx->flags & NETRXF_data_validated ) { 966 /* Tell the stack the checksums are okay */ 967 /* 968 * XXX this isn't necessarily the case - need to add 969 * check 970 */ 971 972 m->m_pkthdr.csum_flags |= 973 (CSUM_IP_CHECKED | CSUM_IP_VALID | CSUM_DATA_VALID 974 | CSUM_PSEUDO_HDR); 975 m->m_pkthdr.csum_data = 0xffff; 976 } 977 978 np->stats.rx_packets++; 979 np->stats.rx_bytes += m->m_pkthdr.len; 980 981 mbufq_tail(&rxq, m); 982 np->rx.rsp_cons = ++i; 983 } 984 985 if (pages_flipped) { 986 /* Some pages are no longer absent... */ 987 #ifdef notyet 988 balloon_update_driver_allowance(-pages_flipped); 989 #endif 990 /* Do all the remapping work, and M->P updates, in one big 991 * hypercall. 992 */ 993 if (!!xen_feature(XENFEAT_auto_translated_physmap)) { 994 mcl = np->rx_mcl + pages_flipped; 995 mcl->op = __HYPERVISOR_mmu_update; 996 mcl->args[0] = (u_long)np->rx_mmu; 997 mcl->args[1] = pages_flipped; 998 mcl->args[2] = 0; 999 mcl->args[3] = DOMID_SELF; 1000 (void)HYPERVISOR_multicall(np->rx_mcl, 1001 pages_flipped + 1); 1002 } 1003 } 1004 1005 while ((m = mbufq_dequeue(&errq))) 1006 m_freem(m); 1007 1008 /* 1009 * Process all the mbufs after the remapping is complete. 1010 * Break the mbuf chain first though. 1011 */ 1012 while ((m = mbufq_dequeue(&rxq)) != NULL) { 1013 ifp->if_ipackets++; 1014 1015 /* 1016 * Do we really need to drop the rx lock? 1017 */ 1018 XN_RX_UNLOCK(np); 1019 #if __FreeBSD_version >= 700000 1020 /* Use LRO if possible */ 1021 if ((ifp->if_capenable & IFCAP_LRO) == 0 || 1022 lro->lro_cnt == 0 || tcp_lro_rx(lro, m, 0)) { 1023 /* 1024 * If LRO fails, pass up to the stack 1025 * directly. 1026 */ 1027 (*ifp->if_input)(ifp, m); 1028 } 1029 #else 1030 (*ifp->if_input)(ifp, m); 1031 #endif 1032 XN_RX_LOCK(np); 1033 } 1034 1035 np->rx.rsp_cons = i; 1036 1037 #if __FreeBSD_version >= 700000 1038 /* 1039 * Flush any outstanding LRO work 1040 */ 1041 while (!SLIST_EMPTY(&lro->lro_active)) { 1042 queued = SLIST_FIRST(&lro->lro_active); 1043 SLIST_REMOVE_HEAD(&lro->lro_active, next); 1044 tcp_lro_flush(lro, queued); 1045 } 1046 #endif 1047 1048 #if 0 1049 /* If we get a callback with very few responses, reduce fill target. */ 1050 /* NB. Note exponential increase, linear decrease. */ 1051 if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) > 1052 ((3*np->rx_target) / 4)) && (--np->rx_target < np->rx_min_target)) 1053 np->rx_target = np->rx_min_target; 1054 #endif 1055 1056 network_alloc_rx_buffers(np); 1057 1058 RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, work_to_do); 1059 } while (work_to_do); 1060 } 1061 1062 static void 1063 xn_txeof(struct netfront_info *np) 1064 { 1065 RING_IDX i, prod; 1066 unsigned short id; 1067 struct ifnet *ifp; 1068 netif_tx_response_t *txr; 1069 struct mbuf *m; 1070 1071 XN_TX_LOCK_ASSERT(np); 1072 1073 if (!netfront_carrier_ok(np)) 1074 return; 1075 1076 ifp = np->xn_ifp; 1077 1078 do { 1079 prod = np->tx.sring->rsp_prod; 1080 rmb(); /* Ensure we see responses up to 'rp'. */ 1081 1082 for (i = np->tx.rsp_cons; i != prod; i++) { 1083 txr = RING_GET_RESPONSE(&np->tx, i); 1084 if (txr->status == NETIF_RSP_NULL) 1085 continue; 1086 1087 id = txr->id; 1088 m = np->xn_cdata.xn_tx_chain[id]; 1089 KASSERT(m != NULL, ("mbuf not found in xn_tx_chain")); 1090 M_ASSERTVALID(m); 1091 1092 /* 1093 * Increment packet count if this is the last 1094 * mbuf of the chain. 1095 */ 1096 if (!m->m_next) 1097 ifp->if_opackets++; 1098 if (unlikely(gnttab_query_foreign_access( 1099 np->grant_tx_ref[id]) != 0)) { 1100 WPRINTK("network_tx_buf_gc: warning " 1101 "-- grant still in use by backend " 1102 "domain.\n"); 1103 goto out; 1104 } 1105 gnttab_end_foreign_access_ref( 1106 np->grant_tx_ref[id]); 1107 gnttab_release_grant_reference( 1108 &np->gref_tx_head, np->grant_tx_ref[id]); 1109 np->grant_tx_ref[id] = GRANT_INVALID_REF; 1110 1111 np->xn_cdata.xn_tx_chain[id] = NULL; 1112 add_id_to_freelist(np->xn_cdata.xn_tx_chain, id); 1113 np->xn_cdata.xn_tx_chain_cnt--; 1114 if (np->xn_cdata.xn_tx_chain_cnt < 0) { 1115 panic("netif_release_tx_bufs: tx_chain_cnt must be >= 0"); 1116 } 1117 m_free(m); 1118 /* Only mark the queue active if we've freed up at least one slot to try */ 1119 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1120 } 1121 np->tx.rsp_cons = prod; 1122 1123 /* 1124 * Set a new event, then check for race with update of 1125 * tx_cons. Note that it is essential to schedule a 1126 * callback, no matter how few buffers are pending. Even if 1127 * there is space in the transmit ring, higher layers may 1128 * be blocked because too much data is outstanding: in such 1129 * cases notification from Xen is likely to be the only kick 1130 * that we'll get. 1131 */ 1132 np->tx.sring->rsp_event = 1133 prod + ((np->tx.sring->req_prod - prod) >> 1) + 1; 1134 1135 mb(); 1136 } while (prod != np->tx.sring->rsp_prod); 1137 1138 out: 1139 if (np->tx_full && 1140 ((np->tx.sring->req_prod - prod) < NET_TX_RING_SIZE)) { 1141 np->tx_full = 0; 1142 #if 0 1143 if (np->user_state == UST_OPEN) 1144 netif_wake_queue(dev); 1145 #endif 1146 } 1147 1148 } 1149 1150 static void 1151 xn_intr(void *xsc) 1152 { 1153 struct netfront_info *np = xsc; 1154 struct ifnet *ifp = np->xn_ifp; 1155 1156 #if 0 1157 if (!(np->rx.rsp_cons != np->rx.sring->rsp_prod && 1158 likely(netfront_carrier_ok(np)) && 1159 ifp->if_drv_flags & IFF_DRV_RUNNING)) 1160 return; 1161 #endif 1162 if (np->tx.rsp_cons != np->tx.sring->rsp_prod) { 1163 XN_TX_LOCK(np); 1164 xn_txeof(np); 1165 XN_TX_UNLOCK(np); 1166 } 1167 1168 XN_RX_LOCK(np); 1169 xn_rxeof(np); 1170 XN_RX_UNLOCK(np); 1171 1172 if (ifp->if_drv_flags & IFF_DRV_RUNNING && 1173 !IFQ_DRV_IS_EMPTY(&ifp->if_snd)) 1174 xn_start(ifp); 1175 } 1176 1177 1178 static void 1179 xennet_move_rx_slot(struct netfront_info *np, struct mbuf *m, 1180 grant_ref_t ref) 1181 { 1182 int new = xennet_rxidx(np->rx.req_prod_pvt); 1183 1184 KASSERT(np->rx_mbufs[new] == NULL, ("rx_mbufs != NULL")); 1185 np->rx_mbufs[new] = m; 1186 np->grant_rx_ref[new] = ref; 1187 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new; 1188 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref; 1189 np->rx.req_prod_pvt++; 1190 } 1191 1192 static int 1193 xennet_get_extras(struct netfront_info *np, 1194 struct netif_extra_info *extras, RING_IDX rp) 1195 { 1196 struct netif_extra_info *extra; 1197 RING_IDX cons = np->rx.rsp_cons; 1198 1199 int err = 0; 1200 1201 do { 1202 struct mbuf *m; 1203 grant_ref_t ref; 1204 1205 if (unlikely(cons + 1 == rp)) { 1206 #if 0 1207 if (net_ratelimit()) 1208 WPRINTK("Missing extra info\n"); 1209 #endif 1210 err = -EINVAL; 1211 break; 1212 } 1213 1214 extra = (struct netif_extra_info *) 1215 RING_GET_RESPONSE(&np->rx, ++cons); 1216 1217 if (unlikely(!extra->type || 1218 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { 1219 #if 0 1220 if (net_ratelimit()) 1221 WPRINTK("Invalid extra type: %d\n", 1222 extra->type); 1223 #endif 1224 err = -EINVAL; 1225 } else { 1226 memcpy(&extras[extra->type - 1], extra, sizeof(*extra)); 1227 } 1228 1229 m = xennet_get_rx_mbuf(np, cons); 1230 ref = xennet_get_rx_ref(np, cons); 1231 xennet_move_rx_slot(np, m, ref); 1232 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); 1233 1234 np->rx.rsp_cons = cons; 1235 return err; 1236 } 1237 1238 static int 1239 xennet_get_responses(struct netfront_info *np, 1240 struct netfront_rx_info *rinfo, RING_IDX rp, 1241 struct mbuf **list, 1242 int *pages_flipped_p) 1243 { 1244 int pages_flipped = *pages_flipped_p; 1245 struct mmu_update *mmu; 1246 struct multicall_entry *mcl; 1247 struct netif_rx_response *rx = &rinfo->rx; 1248 struct netif_extra_info *extras = rinfo->extras; 1249 RING_IDX cons = np->rx.rsp_cons; 1250 struct mbuf *m, *m0, *m_prev; 1251 grant_ref_t ref = xennet_get_rx_ref(np, cons); 1252 int max = 5 /* MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD) */; 1253 int frags = 1; 1254 int err = 0; 1255 u_long ret; 1256 1257 m0 = m = m_prev = xennet_get_rx_mbuf(np, cons); 1258 1259 1260 if (rx->flags & NETRXF_extra_info) { 1261 err = xennet_get_extras(np, extras, rp); 1262 cons = np->rx.rsp_cons; 1263 } 1264 1265 1266 if (m0 != NULL) { 1267 m0->m_pkthdr.len = 0; 1268 m0->m_next = NULL; 1269 } 1270 1271 for (;;) { 1272 u_long mfn; 1273 1274 #if 0 1275 DPRINTK("rx->status=%hd rx->offset=%hu frags=%u\n", 1276 rx->status, rx->offset, frags); 1277 #endif 1278 if (unlikely(rx->status < 0 || 1279 rx->offset + rx->status > PAGE_SIZE)) { 1280 #if 0 1281 if (net_ratelimit()) 1282 WPRINTK("rx->offset: %x, size: %u\n", 1283 rx->offset, rx->status); 1284 #endif 1285 xennet_move_rx_slot(np, m, ref); 1286 err = -EINVAL; 1287 goto next; 1288 } 1289 1290 /* 1291 * This definitely indicates a bug, either in this driver or in 1292 * the backend driver. In future this should flag the bad 1293 * situation to the system controller to reboot the backed. 1294 */ 1295 if (ref == GRANT_INVALID_REF) { 1296 #if 0 1297 if (net_ratelimit()) 1298 WPRINTK("Bad rx response id %d.\n", rx->id); 1299 #endif 1300 err = -EINVAL; 1301 goto next; 1302 } 1303 1304 if (!np->copying_receiver) { 1305 /* Memory pressure, insufficient buffer 1306 * headroom, ... 1307 */ 1308 if (!(mfn = gnttab_end_foreign_transfer_ref(ref))) { 1309 if (net_ratelimit()) 1310 WPRINTK("Unfulfilled rx req " 1311 "(id=%d, st=%d).\n", 1312 rx->id, rx->status); 1313 xennet_move_rx_slot(np, m, ref); 1314 err = -ENOMEM; 1315 goto next; 1316 } 1317 1318 if (!xen_feature( XENFEAT_auto_translated_physmap)) { 1319 /* Remap the page. */ 1320 void *vaddr = mtod(m, void *); 1321 uint32_t pfn; 1322 1323 mcl = np->rx_mcl + pages_flipped; 1324 mmu = np->rx_mmu + pages_flipped; 1325 1326 MULTI_update_va_mapping(mcl, (u_long)vaddr, 1327 (((vm_paddr_t)mfn) << PAGE_SHIFT) | PG_RW | 1328 PG_V | PG_M | PG_A, 0); 1329 pfn = (uintptr_t)m->m_ext.ext_arg1; 1330 mmu->ptr = ((vm_paddr_t)mfn << PAGE_SHIFT) | 1331 MMU_MACHPHYS_UPDATE; 1332 mmu->val = pfn; 1333 1334 set_phys_to_machine(pfn, mfn); 1335 } 1336 pages_flipped++; 1337 } else { 1338 ret = gnttab_end_foreign_access_ref(ref); 1339 KASSERT(ret, ("ret != 0")); 1340 } 1341 1342 gnttab_release_grant_reference(&np->gref_rx_head, ref); 1343 1344 next: 1345 if (m == NULL) 1346 break; 1347 1348 m->m_len = rx->status; 1349 m->m_data += rx->offset; 1350 m0->m_pkthdr.len += rx->status; 1351 1352 if (!(rx->flags & NETRXF_more_data)) 1353 break; 1354 1355 if (cons + frags == rp) { 1356 if (net_ratelimit()) 1357 WPRINTK("Need more frags\n"); 1358 err = -ENOENT; 1359 break; 1360 } 1361 m_prev = m; 1362 1363 rx = RING_GET_RESPONSE(&np->rx, cons + frags); 1364 m = xennet_get_rx_mbuf(np, cons + frags); 1365 1366 m_prev->m_next = m; 1367 m->m_next = NULL; 1368 ref = xennet_get_rx_ref(np, cons + frags); 1369 frags++; 1370 } 1371 *list = m0; 1372 1373 if (unlikely(frags > max)) { 1374 if (net_ratelimit()) 1375 WPRINTK("Too many frags\n"); 1376 err = -E2BIG; 1377 } 1378 1379 if (unlikely(err)) 1380 np->rx.rsp_cons = cons + frags; 1381 1382 *pages_flipped_p = pages_flipped; 1383 1384 return err; 1385 } 1386 1387 static void 1388 xn_tick_locked(struct netfront_info *sc) 1389 { 1390 XN_RX_LOCK_ASSERT(sc); 1391 callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc); 1392 1393 /* XXX placeholder for printing debug information */ 1394 1395 } 1396 1397 1398 static void 1399 xn_tick(void *xsc) 1400 { 1401 struct netfront_info *sc; 1402 1403 sc = xsc; 1404 XN_RX_LOCK(sc); 1405 xn_tick_locked(sc); 1406 XN_RX_UNLOCK(sc); 1407 1408 } 1409 static void 1410 xn_start_locked(struct ifnet *ifp) 1411 { 1412 int otherend_id; 1413 unsigned short id; 1414 struct mbuf *m_head, *m; 1415 struct netfront_info *sc; 1416 netif_tx_request_t *tx; 1417 netif_extra_info_t *extra; 1418 RING_IDX i; 1419 grant_ref_t ref; 1420 u_long mfn, tx_bytes; 1421 int notify, nfrags; 1422 1423 sc = ifp->if_softc; 1424 otherend_id = xenbus_get_otherend_id(sc->xbdev); 1425 tx_bytes = 0; 1426 1427 if (!netfront_carrier_ok(sc)) 1428 return; 1429 1430 for (i = sc->tx.req_prod_pvt; TRUE; i++) { 1431 IF_DEQUEUE(&ifp->if_snd, m_head); 1432 if (m_head == NULL) 1433 break; 1434 1435 /* 1436 * netfront_tx_slot_available() tries to do some math to 1437 * ensure that there'll be enough xenbus ring slots available 1438 * for the maximum number of packet fragments (and a couple more 1439 * for what I guess are TSO and other ring entry items.) 1440 */ 1441 if (!netfront_tx_slot_available(sc)) { 1442 IF_PREPEND(&ifp->if_snd, m_head); 1443 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1444 break; 1445 } 1446 1447 /* 1448 * Defragment the mbuf if necessary. 1449 */ 1450 for (m = m_head, nfrags = 0; m; m = m->m_next) 1451 nfrags++; 1452 if (nfrags > MAX_SKB_FRAGS) { 1453 m = m_defrag(m_head, M_DONTWAIT); 1454 if (!m) { 1455 m_freem(m_head); 1456 break; 1457 } 1458 m_head = m; 1459 } 1460 1461 /* Determine how many fragments now exist */ 1462 for (m = m_head, nfrags = 0; m; m = m->m_next) 1463 nfrags++; 1464 1465 /* 1466 * Don't attempt to queue this packet if there aren't 1467 * enough free entries in the chain. 1468 * 1469 * There isn't a 1:1 correspondance between the mbuf TX ring 1470 * and the xenbus TX ring. 1471 * xn_txeof() may need to be called to free up some slots. 1472 * 1473 * It is quite possible that this can be later eliminated if 1474 * it turns out that partial * packets can be pushed into 1475 * the ringbuffer, with fragments pushed in when further slots 1476 * free up. 1477 * 1478 * It is also quite possible that the driver will lock up 1479 * if the TX queue fills up with no RX traffic, and 1480 * the mbuf ring is exhausted. The queue may need 1481 * a swift kick to continue. 1482 */ 1483 1484 /* 1485 * It is not +1 like the allocation because we need to keep 1486 * slot [0] free for the freelist head 1487 */ 1488 if (sc->xn_cdata.xn_tx_chain_cnt + nfrags >= NET_TX_RING_SIZE) { 1489 WPRINTK("xn_start_locked: xn_tx_chain_cnt (%d) + nfrags %d >= NET_TX_RING_SIZE (%d); must be full!\n", 1490 (int) sc->xn_cdata.xn_tx_chain_cnt, 1491 (int) nfrags, (int) NET_TX_RING_SIZE); 1492 IF_PREPEND(&ifp->if_snd, m_head); 1493 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1494 break; 1495 } 1496 1497 /* 1498 * Make sure there's actually space available in the 1499 * Xen TX ring for this. Overcompensate for the possibility 1500 * of having a TCP offload fragment just in case for now 1501 * (the +1) rather than adding logic to accurately calculate 1502 * the required size. 1503 */ 1504 if (RING_FREE_REQUESTS(&sc->tx) < (nfrags + 1)) { 1505 WPRINTK("xn_start_locked: free ring slots (%d) < (nfrags + 1) (%d); must be full!\n", 1506 (int) RING_FREE_REQUESTS(&sc->tx), 1507 (int) (nfrags + 1)); 1508 IF_PREPEND(&ifp->if_snd, m_head); 1509 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1510 break; 1511 } 1512 1513 /* 1514 * Start packing the mbufs in this chain into 1515 * the fragment pointers. Stop when we run out 1516 * of fragments or hit the end of the mbuf chain. 1517 */ 1518 m = m_head; 1519 extra = NULL; 1520 for (m = m_head; m; m = m->m_next) { 1521 tx = RING_GET_REQUEST(&sc->tx, i); 1522 id = get_id_from_freelist(sc->xn_cdata.xn_tx_chain); 1523 if (id == 0) 1524 panic("xn_start_locked: was allocated the freelist head!\n"); 1525 sc->xn_cdata.xn_tx_chain_cnt++; 1526 if (sc->xn_cdata.xn_tx_chain_cnt >= NET_TX_RING_SIZE+1) 1527 panic("xn_start_locked: tx_chain_cnt must be < NET_TX_RING_SIZE+1\n"); 1528 sc->xn_cdata.xn_tx_chain[id] = m; 1529 tx->id = id; 1530 ref = gnttab_claim_grant_reference(&sc->gref_tx_head); 1531 KASSERT((short)ref >= 0, ("Negative ref")); 1532 mfn = virt_to_mfn(mtod(m, vm_offset_t)); 1533 gnttab_grant_foreign_access_ref(ref, otherend_id, 1534 mfn, GNTMAP_readonly); 1535 tx->gref = sc->grant_tx_ref[id] = ref; 1536 tx->offset = mtod(m, vm_offset_t) & (PAGE_SIZE - 1); 1537 tx->flags = 0; 1538 if (m == m_head) { 1539 /* 1540 * The first fragment has the entire packet 1541 * size, subsequent fragments have just the 1542 * fragment size. The backend works out the 1543 * true size of the first fragment by 1544 * subtracting the sizes of the other 1545 * fragments. 1546 */ 1547 tx->size = m->m_pkthdr.len; 1548 1549 /* 1550 * The first fragment contains the 1551 * checksum flags and is optionally 1552 * followed by extra data for TSO etc. 1553 */ 1554 if (m->m_pkthdr.csum_flags 1555 & CSUM_DELAY_DATA) { 1556 tx->flags |= (NETTXF_csum_blank 1557 | NETTXF_data_validated); 1558 } 1559 #if __FreeBSD_version >= 700000 1560 if (m->m_pkthdr.csum_flags & CSUM_TSO) { 1561 struct netif_extra_info *gso = 1562 (struct netif_extra_info *) 1563 RING_GET_REQUEST(&sc->tx, ++i); 1564 1565 if (extra) 1566 extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE; 1567 else 1568 tx->flags |= NETTXF_extra_info; 1569 1570 gso->u.gso.size = m->m_pkthdr.tso_segsz; 1571 gso->u.gso.type = 1572 XEN_NETIF_GSO_TYPE_TCPV4; 1573 gso->u.gso.pad = 0; 1574 gso->u.gso.features = 0; 1575 1576 gso->type = XEN_NETIF_EXTRA_TYPE_GSO; 1577 gso->flags = 0; 1578 extra = gso; 1579 } 1580 #endif 1581 } else { 1582 tx->size = m->m_len; 1583 } 1584 if (m->m_next) { 1585 tx->flags |= NETTXF_more_data; 1586 i++; 1587 } 1588 } 1589 1590 BPF_MTAP(ifp, m_head); 1591 1592 sc->stats.tx_bytes += m_head->m_pkthdr.len; 1593 sc->stats.tx_packets++; 1594 } 1595 1596 sc->tx.req_prod_pvt = i; 1597 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->tx, notify); 1598 if (notify) 1599 notify_remote_via_irq(sc->irq); 1600 1601 xn_txeof(sc); 1602 1603 if (RING_FULL(&sc->tx)) { 1604 sc->tx_full = 1; 1605 #if 0 1606 netif_stop_queue(dev); 1607 #endif 1608 } 1609 1610 return; 1611 } 1612 1613 static void 1614 xn_start(struct ifnet *ifp) 1615 { 1616 struct netfront_info *sc; 1617 sc = ifp->if_softc; 1618 XN_TX_LOCK(sc); 1619 xn_start_locked(ifp); 1620 XN_TX_UNLOCK(sc); 1621 } 1622 1623 /* equivalent of network_open() in Linux */ 1624 static void 1625 xn_ifinit_locked(struct netfront_info *sc) 1626 { 1627 struct ifnet *ifp; 1628 1629 XN_LOCK_ASSERT(sc); 1630 1631 ifp = sc->xn_ifp; 1632 1633 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1634 return; 1635 1636 xn_stop(sc); 1637 1638 network_alloc_rx_buffers(sc); 1639 sc->rx.sring->rsp_event = sc->rx.rsp_cons + 1; 1640 1641 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1642 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1643 if_link_state_change(ifp, LINK_STATE_UP); 1644 1645 callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc); 1646 1647 } 1648 1649 1650 static void 1651 xn_ifinit(void *xsc) 1652 { 1653 struct netfront_info *sc = xsc; 1654 1655 XN_LOCK(sc); 1656 xn_ifinit_locked(sc); 1657 XN_UNLOCK(sc); 1658 1659 } 1660 1661 1662 static int 1663 xn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1664 { 1665 struct netfront_info *sc = ifp->if_softc; 1666 struct ifreq *ifr = (struct ifreq *) data; 1667 struct ifaddr *ifa = (struct ifaddr *)data; 1668 1669 int mask, error = 0; 1670 switch(cmd) { 1671 case SIOCSIFADDR: 1672 case SIOCGIFADDR: 1673 XN_LOCK(sc); 1674 if (ifa->ifa_addr->sa_family == AF_INET) { 1675 ifp->if_flags |= IFF_UP; 1676 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) 1677 xn_ifinit_locked(sc); 1678 arp_ifinit(ifp, ifa); 1679 XN_UNLOCK(sc); 1680 } else { 1681 XN_UNLOCK(sc); 1682 error = ether_ioctl(ifp, cmd, data); 1683 } 1684 break; 1685 case SIOCSIFMTU: 1686 /* XXX can we alter the MTU on a VN ?*/ 1687 #ifdef notyet 1688 if (ifr->ifr_mtu > XN_JUMBO_MTU) 1689 error = EINVAL; 1690 else 1691 #endif 1692 { 1693 ifp->if_mtu = ifr->ifr_mtu; 1694 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1695 xn_ifinit(sc); 1696 } 1697 break; 1698 case SIOCSIFFLAGS: 1699 XN_LOCK(sc); 1700 if (ifp->if_flags & IFF_UP) { 1701 /* 1702 * If only the state of the PROMISC flag changed, 1703 * then just use the 'set promisc mode' command 1704 * instead of reinitializing the entire NIC. Doing 1705 * a full re-init means reloading the firmware and 1706 * waiting for it to start up, which may take a 1707 * second or two. 1708 */ 1709 #ifdef notyet 1710 /* No promiscuous mode with Xen */ 1711 if (ifp->if_drv_flags & IFF_DRV_RUNNING && 1712 ifp->if_flags & IFF_PROMISC && 1713 !(sc->xn_if_flags & IFF_PROMISC)) { 1714 XN_SETBIT(sc, XN_RX_MODE, 1715 XN_RXMODE_RX_PROMISC); 1716 } else if (ifp->if_drv_flags & IFF_DRV_RUNNING && 1717 !(ifp->if_flags & IFF_PROMISC) && 1718 sc->xn_if_flags & IFF_PROMISC) { 1719 XN_CLRBIT(sc, XN_RX_MODE, 1720 XN_RXMODE_RX_PROMISC); 1721 } else 1722 #endif 1723 xn_ifinit_locked(sc); 1724 } else { 1725 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1726 xn_stop(sc); 1727 } 1728 } 1729 sc->xn_if_flags = ifp->if_flags; 1730 XN_UNLOCK(sc); 1731 error = 0; 1732 break; 1733 case SIOCSIFCAP: 1734 mask = ifr->ifr_reqcap ^ ifp->if_capenable; 1735 if (mask & IFCAP_TXCSUM) { 1736 if (IFCAP_TXCSUM & ifp->if_capenable) { 1737 ifp->if_capenable &= ~(IFCAP_TXCSUM|IFCAP_TSO4); 1738 ifp->if_hwassist &= ~(CSUM_TCP | CSUM_UDP 1739 | CSUM_IP | CSUM_TSO); 1740 } else { 1741 ifp->if_capenable |= IFCAP_TXCSUM; 1742 ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP 1743 | CSUM_IP); 1744 } 1745 } 1746 if (mask & IFCAP_RXCSUM) { 1747 ifp->if_capenable ^= IFCAP_RXCSUM; 1748 } 1749 #if __FreeBSD_version >= 700000 1750 if (mask & IFCAP_TSO4) { 1751 if (IFCAP_TSO4 & ifp->if_capenable) { 1752 ifp->if_capenable &= ~IFCAP_TSO4; 1753 ifp->if_hwassist &= ~CSUM_TSO; 1754 } else if (IFCAP_TXCSUM & ifp->if_capenable) { 1755 ifp->if_capenable |= IFCAP_TSO4; 1756 ifp->if_hwassist |= CSUM_TSO; 1757 } else { 1758 IPRINTK("Xen requires tx checksum offload" 1759 " be enabled to use TSO\n"); 1760 error = EINVAL; 1761 } 1762 } 1763 if (mask & IFCAP_LRO) { 1764 ifp->if_capenable ^= IFCAP_LRO; 1765 1766 } 1767 #endif 1768 error = 0; 1769 break; 1770 case SIOCADDMULTI: 1771 case SIOCDELMULTI: 1772 #ifdef notyet 1773 if (ifp->if_drv_flags & IFF_DRV_RUNNING) { 1774 XN_LOCK(sc); 1775 xn_setmulti(sc); 1776 XN_UNLOCK(sc); 1777 error = 0; 1778 } 1779 #endif 1780 /* FALLTHROUGH */ 1781 case SIOCSIFMEDIA: 1782 case SIOCGIFMEDIA: 1783 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 1784 break; 1785 default: 1786 error = ether_ioctl(ifp, cmd, data); 1787 } 1788 1789 return (error); 1790 } 1791 1792 static void 1793 xn_stop(struct netfront_info *sc) 1794 { 1795 struct ifnet *ifp; 1796 1797 XN_LOCK_ASSERT(sc); 1798 1799 ifp = sc->xn_ifp; 1800 1801 callout_stop(&sc->xn_stat_ch); 1802 1803 xn_free_rx_ring(sc); 1804 xn_free_tx_ring(sc); 1805 1806 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE); 1807 if_link_state_change(ifp, LINK_STATE_DOWN); 1808 } 1809 1810 /* START of Xenolinux helper functions adapted to FreeBSD */ 1811 int 1812 network_connect(struct netfront_info *np) 1813 { 1814 int i, requeue_idx, error; 1815 grant_ref_t ref; 1816 netif_rx_request_t *req; 1817 u_int feature_rx_copy, feature_rx_flip; 1818 1819 error = xenbus_scanf(XBT_NIL, xenbus_get_otherend_path(np->xbdev), 1820 "feature-rx-copy", NULL, "%u", &feature_rx_copy); 1821 if (error) 1822 feature_rx_copy = 0; 1823 error = xenbus_scanf(XBT_NIL, xenbus_get_otherend_path(np->xbdev), 1824 "feature-rx-flip", NULL, "%u", &feature_rx_flip); 1825 if (error) 1826 feature_rx_flip = 1; 1827 1828 /* 1829 * Copy packets on receive path if: 1830 * (a) This was requested by user, and the backend supports it; or 1831 * (b) Flipping was requested, but this is unsupported by the backend. 1832 */ 1833 np->copying_receiver = ((MODPARM_rx_copy && feature_rx_copy) || 1834 (MODPARM_rx_flip && !feature_rx_flip)); 1835 1836 /* Recovery procedure: */ 1837 error = talk_to_backend(np->xbdev, np); 1838 if (error) 1839 return (error); 1840 1841 /* Step 1: Reinitialise variables. */ 1842 netif_release_tx_bufs(np); 1843 1844 /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */ 1845 for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) { 1846 struct mbuf *m; 1847 u_long pfn; 1848 1849 if (np->rx_mbufs[i] == NULL) 1850 continue; 1851 1852 m = np->rx_mbufs[requeue_idx] = xennet_get_rx_mbuf(np, i); 1853 ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i); 1854 req = RING_GET_REQUEST(&np->rx, requeue_idx); 1855 pfn = vtophys(mtod(m, vm_offset_t)) >> PAGE_SHIFT; 1856 1857 if (!np->copying_receiver) { 1858 gnttab_grant_foreign_transfer_ref(ref, 1859 xenbus_get_otherend_id(np->xbdev), 1860 pfn); 1861 } else { 1862 gnttab_grant_foreign_access_ref(ref, 1863 xenbus_get_otherend_id(np->xbdev), 1864 PFNTOMFN(pfn), 0); 1865 } 1866 req->gref = ref; 1867 req->id = requeue_idx; 1868 1869 requeue_idx++; 1870 } 1871 1872 np->rx.req_prod_pvt = requeue_idx; 1873 1874 /* Step 3: All public and private state should now be sane. Get 1875 * ready to start sending and receiving packets and give the driver 1876 * domain a kick because we've probably just requeued some 1877 * packets. 1878 */ 1879 netfront_carrier_on(np); 1880 notify_remote_via_irq(np->irq); 1881 XN_TX_LOCK(np); 1882 xn_txeof(np); 1883 XN_TX_UNLOCK(np); 1884 network_alloc_rx_buffers(np); 1885 1886 return (0); 1887 } 1888 1889 static void 1890 show_device(struct netfront_info *sc) 1891 { 1892 #ifdef DEBUG 1893 if (sc) { 1894 IPRINTK("<vif handle=%u %s(%s) evtchn=%u irq=%u tx=%p rx=%p>\n", 1895 sc->xn_ifno, 1896 be_state_name[sc->xn_backend_state], 1897 sc->xn_user_state ? "open" : "closed", 1898 sc->xn_evtchn, 1899 sc->xn_irq, 1900 sc->xn_tx_if, 1901 sc->xn_rx_if); 1902 } else { 1903 IPRINTK("<vif NULL>\n"); 1904 } 1905 #endif 1906 } 1907 1908 /** Create a network device. 1909 * @param handle device handle 1910 */ 1911 int 1912 create_netdev(device_t dev) 1913 { 1914 int i; 1915 struct netfront_info *np; 1916 int err; 1917 struct ifnet *ifp; 1918 1919 np = device_get_softc(dev); 1920 1921 np->xbdev = dev; 1922 1923 XN_LOCK_INIT(np, xennetif); 1924 1925 ifmedia_init(&np->sc_media, 0, xn_ifmedia_upd, xn_ifmedia_sts); 1926 ifmedia_add(&np->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL); 1927 ifmedia_set(&np->sc_media, IFM_ETHER|IFM_MANUAL); 1928 1929 np->rx_target = RX_MIN_TARGET; 1930 np->rx_min_target = RX_MIN_TARGET; 1931 np->rx_max_target = RX_MAX_TARGET; 1932 1933 /* Initialise {tx,rx}_skbs to be a free chain containing every entry. */ 1934 for (i = 0; i <= NET_TX_RING_SIZE; i++) { 1935 np->tx_mbufs[i] = (void *) ((u_long) i+1); 1936 np->grant_tx_ref[i] = GRANT_INVALID_REF; 1937 } 1938 for (i = 0; i <= NET_RX_RING_SIZE; i++) { 1939 np->rx_mbufs[i] = NULL; 1940 np->grant_rx_ref[i] = GRANT_INVALID_REF; 1941 } 1942 /* A grant for every tx ring slot */ 1943 if (gnttab_alloc_grant_references(TX_MAX_TARGET, 1944 &np->gref_tx_head) < 0) { 1945 IPRINTK("#### netfront can't alloc tx grant refs\n"); 1946 err = ENOMEM; 1947 goto exit; 1948 } 1949 /* A grant for every rx ring slot */ 1950 if (gnttab_alloc_grant_references(RX_MAX_TARGET, 1951 &np->gref_rx_head) < 0) { 1952 WPRINTK("#### netfront can't alloc rx grant refs\n"); 1953 gnttab_free_grant_references(np->gref_tx_head); 1954 err = ENOMEM; 1955 goto exit; 1956 } 1957 1958 err = xen_net_read_mac(dev, np->mac); 1959 if (err) { 1960 xenbus_dev_fatal(dev, err, "parsing %s/mac", 1961 xenbus_get_node(dev)); 1962 goto out; 1963 } 1964 1965 /* Set up ifnet structure */ 1966 ifp = np->xn_ifp = if_alloc(IFT_ETHER); 1967 ifp->if_softc = np; 1968 if_initname(ifp, "xn", device_get_unit(dev)); 1969 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 1970 ifp->if_ioctl = xn_ioctl; 1971 ifp->if_output = ether_output; 1972 ifp->if_start = xn_start; 1973 #ifdef notyet 1974 ifp->if_watchdog = xn_watchdog; 1975 #endif 1976 ifp->if_init = xn_ifinit; 1977 ifp->if_mtu = ETHERMTU; 1978 ifp->if_snd.ifq_maxlen = NET_TX_RING_SIZE - 1; 1979 1980 ifp->if_hwassist = XN_CSUM_FEATURES; 1981 ifp->if_capabilities = IFCAP_HWCSUM; 1982 #if __FreeBSD_version >= 700000 1983 if (xn_enable_lro) { 1984 int err = tcp_lro_init(&np->xn_lro); 1985 if (err) { 1986 device_printf(dev, "LRO initialization failed\n"); 1987 goto exit; 1988 } 1989 np->xn_lro.ifp = ifp; 1990 ifp->if_capabilities |= IFCAP_LRO; 1991 } 1992 #endif 1993 ifp->if_capenable = ifp->if_capabilities; 1994 1995 ether_ifattach(ifp, np->mac); 1996 callout_init(&np->xn_stat_ch, CALLOUT_MPSAFE); 1997 netfront_carrier_off(np); 1998 1999 return (0); 2000 2001 exit: 2002 gnttab_free_grant_references(np->gref_tx_head); 2003 out: 2004 panic("do something smart"); 2005 2006 } 2007 2008 /** 2009 * Handle the change of state of the backend to Closing. We must delete our 2010 * device-layer structures now, to ensure that writes are flushed through to 2011 * the backend. Once is this done, we can switch to Closed in 2012 * acknowledgement. 2013 */ 2014 #if 0 2015 static void 2016 netfront_closing(device_t dev) 2017 { 2018 #if 0 2019 struct netfront_info *info = dev->dev_driver_data; 2020 2021 DPRINTK("netfront_closing: %s removed\n", dev->nodename); 2022 2023 close_netdev(info); 2024 #endif 2025 xenbus_switch_state(dev, XenbusStateClosed); 2026 } 2027 #endif 2028 2029 static int 2030 netfront_detach(device_t dev) 2031 { 2032 struct netfront_info *info = device_get_softc(dev); 2033 2034 DPRINTK("%s\n", xenbus_get_node(dev)); 2035 2036 netif_free(info); 2037 2038 return 0; 2039 } 2040 2041 static void 2042 netif_free(struct netfront_info *info) 2043 { 2044 netif_disconnect_backend(info); 2045 #if 0 2046 close_netdev(info); 2047 #endif 2048 } 2049 2050 static void 2051 netif_disconnect_backend(struct netfront_info *info) 2052 { 2053 XN_RX_LOCK(info); 2054 XN_TX_LOCK(info); 2055 netfront_carrier_off(info); 2056 XN_TX_UNLOCK(info); 2057 XN_RX_UNLOCK(info); 2058 2059 end_access(info->tx_ring_ref, info->tx.sring); 2060 end_access(info->rx_ring_ref, info->rx.sring); 2061 info->tx_ring_ref = GRANT_INVALID_REF; 2062 info->rx_ring_ref = GRANT_INVALID_REF; 2063 info->tx.sring = NULL; 2064 info->rx.sring = NULL; 2065 2066 if (info->irq) 2067 unbind_from_irqhandler(info->irq); 2068 2069 info->irq = 0; 2070 } 2071 2072 2073 static void 2074 end_access(int ref, void *page) 2075 { 2076 if (ref != GRANT_INVALID_REF) 2077 gnttab_end_foreign_access(ref, page); 2078 } 2079 2080 static int 2081 xn_ifmedia_upd(struct ifnet *ifp) 2082 { 2083 return (0); 2084 } 2085 2086 static void 2087 xn_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr) 2088 { 2089 ifmr->ifm_status = IFM_AVALID|IFM_ACTIVE; 2090 ifmr->ifm_active = IFM_ETHER|IFM_MANUAL; 2091 } 2092 2093 /* ** Driver registration ** */ 2094 static device_method_t netfront_methods[] = { 2095 /* Device interface */ 2096 DEVMETHOD(device_probe, netfront_probe), 2097 DEVMETHOD(device_attach, netfront_attach), 2098 DEVMETHOD(device_detach, netfront_detach), 2099 DEVMETHOD(device_shutdown, bus_generic_shutdown), 2100 DEVMETHOD(device_suspend, bus_generic_suspend), 2101 DEVMETHOD(device_resume, netfront_resume), 2102 2103 /* Xenbus interface */ 2104 DEVMETHOD(xenbus_backend_changed, netfront_backend_changed), 2105 2106 { 0, 0 } 2107 }; 2108 2109 static driver_t netfront_driver = { 2110 "xn", 2111 netfront_methods, 2112 sizeof(struct netfront_info), 2113 }; 2114 devclass_t netfront_devclass; 2115 2116 DRIVER_MODULE(xe, xenbus, netfront_driver, netfront_devclass, 0, 0); 2117