sys/dev/xen/netfront/netfront.c

   1 /*
   2  *
   3  * Copyright (c) 2004-2006 Kip Macy
   4  * All rights reserved.
   5  *
   6  *
   7  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   8  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   9  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  10  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  11  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  12  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  13  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  14  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  15  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  16  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  17  */
  18
  19
  20 #include <sys/cdefs.h>
  21 __FBSDID("$FreeBSD$");
  22
  23 #include <sys/param.h>
  24 #include <sys/systm.h>
  25 #include <sys/sockio.h>
  26 #include <sys/mbuf.h>
  27 #include <sys/malloc.h>
  28 #include <sys/module.h>
  29 #include <sys/kernel.h>
  30 #include <sys/socket.h>
  31 #include <sys/sysctl.h>
  32 #include <sys/queue.h>
  33 #include <sys/sx.h>
  34
  35 #include <net/if.h>
  36 #include <net/if_arp.h>
  37 #include <net/ethernet.h>
  38 #include <net/if_dl.h>
  39 #include <net/if_media.h>
  40
  41 #include <net/bpf.h>
  42
  43 #include <net/if_types.h>
  44 #include <net/if.h>
  45
  46 #include <netinet/in_systm.h>
  47 #include <netinet/in.h>
  48 #include <netinet/ip.h>
  49 #include <netinet/if_ether.h>
  50 #if __FreeBSD_version >= 700000
  51 #include <netinet/tcp.h>
  52 #include <netinet/tcp_lro.h>
  53 #endif
  54
  55 #include <vm/vm.h>
  56 #include <vm/pmap.h>
  57
  58 #include <machine/clock.h>      /* for DELAY */
  59 #include <machine/bus.h>
  60 #include <machine/resource.h>
  61 #include <machine/frame.h>
  62 #include <machine/vmparam.h>
  63
  64 #include <sys/bus.h>
  65 #include <sys/rman.h>
  66
  67 #include <machine/intr_machdep.h>
  68
  69 #include <machine/xen/xen-os.h>
  70 #include <machine/xen/xenfunc.h>
  71 #include <xen/hypervisor.h>
  72 #include <xen/xen_intr.h>
  73 #include <xen/evtchn.h>
  74 #include <xen/gnttab.h>
  75 #include <xen/interface/memory.h>
  76 #include <xen/interface/io/netif.h>
  77 #include <xen/xenbus/xenbusvar.h>
  78
  79 #include <dev/xen/netfront/mbufq.h>
  80
  81 #include "xenbus_if.h"
  82
  83 #define XN_CSUM_FEATURES        (CSUM_TCP | CSUM_UDP | CSUM_TSO)
  84
  85 #define GRANT_INVALID_REF       0
  86
  87 #define NET_TX_RING_SIZE __RING_SIZE((netif_tx_sring_t *)0, PAGE_SIZE)
  88 #define NET_RX_RING_SIZE __RING_SIZE((netif_rx_sring_t *)0, PAGE_SIZE)
  89
  90 #if __FreeBSD_version >= 700000
  91 /*
  92  * Should the driver do LRO on the RX end
  93  *  this can be toggled on the fly, but the
  94  *  interface must be reset (down/up) for it
  95  *  to take effect.
  96  */
  97 static int xn_enable_lro = 1;
  98 TUNABLE_INT("hw.xn.enable_lro", &xn_enable_lro);
  99 #else
 100
 101 #define IFCAP_TSO4      0
 102 #define CSUM_TSO        0
 103
 104 #endif
 105
 106 #ifdef CONFIG_XEN
 107 static int MODPARM_rx_copy = 0;
 108 module_param_named(rx_copy, MODPARM_rx_copy, bool, 0);
 109 MODULE_PARM_DESC(rx_copy, "Copy packets from network card (rather than flip)");
 110 static int MODPARM_rx_flip = 0;
 111 module_param_named(rx_flip, MODPARM_rx_flip, bool, 0);
 112 MODULE_PARM_DESC(rx_flip, "Flip packets from network card (rather than copy)");
 113 #else
 114 static const int MODPARM_rx_copy = 1;
 115 static const int MODPARM_rx_flip = 0;
 116 #endif
 117
 118 #define MAX_SKB_FRAGS   (65536/PAGE_SIZE + 2)
 119 #define RX_COPY_THRESHOLD 256
 120
 121 #define net_ratelimit() 0
 122
 123 struct netfront_info;
 124 struct netfront_rx_info;
 125
 126 static void xn_txeof(struct netfront_info *);
 127 static void xn_rxeof(struct netfront_info *);
 128 static void network_alloc_rx_buffers(struct netfront_info *);
 129
 130 static void xn_tick_locked(struct netfront_info *);
 131 static void xn_tick(void *);
 132
 133 static void xn_intr(void *);
 134 static void xn_start_locked(struct ifnet *);
 135 static void xn_start(struct ifnet *);
 136 static int  xn_ioctl(struct ifnet *, u_long, caddr_t);
 137 static void xn_ifinit_locked(struct netfront_info *);
 138 static void xn_ifinit(void *);
 139 static void xn_stop(struct netfront_info *);
 140 #ifdef notyet
 141 static void xn_watchdog(struct ifnet *);
 142 #endif
 143
 144 static void show_device(struct netfront_info *sc);
 145 #ifdef notyet
 146 static void netfront_closing(device_t dev);
 147 #endif
 148 static void netif_free(struct netfront_info *info);
 149 static int netfront_detach(device_t dev);
 150
 151 static int talk_to_backend(device_t dev, struct netfront_info *info);
 152 static int create_netdev(device_t dev);
 153 static void netif_disconnect_backend(struct netfront_info *info);
 154 static int setup_device(device_t dev, struct netfront_info *info);
 155 static void end_access(int ref, void *page);
 156
 157 /* Xenolinux helper functions */
 158 int network_connect(struct netfront_info *);
 159
 160 static void xn_free_rx_ring(struct netfront_info *);
 161
 162 static void xn_free_tx_ring(struct netfront_info *);
 163
 164 static int xennet_get_responses(struct netfront_info *np,
 165         struct netfront_rx_info *rinfo, RING_IDX rp, struct mbuf **list,
 166         int *pages_flipped_p);
 167
 168 #define virt_to_mfn(x) (vtomach(x) >> PAGE_SHIFT)
 169
 170 #define INVALID_P2M_ENTRY (~0UL)
 171
 172 /*
 173  * Mbuf pointers. We need these to keep track of the virtual addresses
 174  * of our mbuf chains since we can only convert from virtual to physical,
 175  * not the other way around.  The size must track the free index arrays.
 176  */
 177 struct xn_chain_data {
 178                 struct mbuf             *xn_tx_chain[NET_TX_RING_SIZE+1];
 179                 struct mbuf             *xn_rx_chain[NET_RX_RING_SIZE+1];
 180 };
 181
 182
 183 struct net_device_stats
 184 {
 185         u_long  rx_packets;             /* total packets received       */
 186         u_long  tx_packets;             /* total packets transmitted    */
 187         u_long  rx_bytes;               /* total bytes received         */
 188         u_long  tx_bytes;               /* total bytes transmitted      */
 189         u_long  rx_errors;              /* bad packets received         */
 190         u_long  tx_errors;              /* packet transmit problems     */
 191         u_long  rx_dropped;             /* no space in linux buffers    */
 192         u_long  tx_dropped;             /* no space available in linux  */
 193         u_long  multicast;              /* multicast packets received   */
 194         u_long  collisions;
 195
 196         /* detailed rx_errors: */
 197         u_long  rx_length_errors;
 198         u_long  rx_over_errors;         /* receiver ring buff overflow  */
 199         u_long  rx_crc_errors;          /* recved pkt with crc error    */
 200         u_long  rx_frame_errors;        /* recv'd frame alignment error */
 201         u_long  rx_fifo_errors;         /* recv'r fifo overrun          */
 202         u_long  rx_missed_errors;       /* receiver missed packet       */
 203
 204         /* detailed tx_errors */
 205         u_long  tx_aborted_errors;
 206         u_long  tx_carrier_errors;
 207         u_long  tx_fifo_errors;
 208         u_long  tx_heartbeat_errors;
 209         u_long  tx_window_errors;
 210
 211         /* for cslip etc */
 212         u_long  rx_compressed;
 213         u_long  tx_compressed;
 214 };
 215
 216 struct netfront_info {
 217
 218         struct ifnet *xn_ifp;
 219 #if __FreeBSD_version >= 700000
 220         struct lro_ctrl xn_lro;
 221 #endif
 222
 223         struct net_device_stats stats;
 224         u_int tx_full;
 225
 226         netif_tx_front_ring_t tx;
 227         netif_rx_front_ring_t rx;
 228
 229         struct mtx   tx_lock;
 230         struct mtx   rx_lock;
 231         struct sx    sc_lock;
 232
 233         u_int handle;
 234         u_int irq;
 235         u_int copying_receiver;
 236         u_int carrier;
 237
 238         /* Receive-ring batched refills. */
 239 #define RX_MIN_TARGET 32
 240 #define RX_MAX_TARGET NET_RX_RING_SIZE
 241         int rx_min_target, rx_max_target, rx_target;
 242
 243         /*
 244          * {tx,rx}_skbs store outstanding skbuffs. The first entry in each
 245          * array is an index into a chain of free entries.
 246          */
 247
 248         grant_ref_t gref_tx_head;
 249         grant_ref_t grant_tx_ref[NET_TX_RING_SIZE + 1];
 250         grant_ref_t gref_rx_head;
 251         grant_ref_t grant_rx_ref[NET_TX_RING_SIZE + 1];
 252
 253 #define TX_MAX_TARGET min(NET_RX_RING_SIZE, 256)
 254         device_t xbdev;
 255         int tx_ring_ref;
 256         int rx_ring_ref;
 257         uint8_t mac[ETHER_ADDR_LEN];
 258         struct xn_chain_data    xn_cdata;       /* mbufs */
 259         struct mbuf_head xn_rx_batch;   /* head of the batch queue */
 260
 261         int                     xn_if_flags;
 262         struct callout          xn_stat_ch;
 263
 264         u_long rx_pfn_array[NET_RX_RING_SIZE];
 265         multicall_entry_t rx_mcl[NET_RX_RING_SIZE+1];
 266         mmu_update_t rx_mmu[NET_RX_RING_SIZE];
 267 };
 268
 269 #define rx_mbufs xn_cdata.xn_rx_chain
 270 #define tx_mbufs xn_cdata.xn_tx_chain
 271
 272 #define XN_LOCK_INIT(_sc, _name) \
 273         mtx_init(&(_sc)->tx_lock, #_name"_tx", "network transmit lock", MTX_DEF); \
 274         mtx_init(&(_sc)->rx_lock, #_name"_rx", "network receive lock", MTX_DEF);  \
 275         sx_init(&(_sc)->sc_lock, #_name"_rx")
 276
 277 #define XN_RX_LOCK(_sc)           mtx_lock(&(_sc)->rx_lock)
 278 #define XN_RX_UNLOCK(_sc)         mtx_unlock(&(_sc)->rx_lock)
 279
 280 #define XN_TX_LOCK(_sc)           mtx_lock(&(_sc)->tx_lock)
 281 #define XN_TX_UNLOCK(_sc)         mtx_unlock(&(_sc)->tx_lock)
 282
 283 #define XN_LOCK(_sc)           sx_xlock(&(_sc)->sc_lock);
 284 #define XN_UNLOCK(_sc)         sx_xunlock(&(_sc)->sc_lock);
 285
 286 #define XN_LOCK_ASSERT(_sc)    sx_assert(&(_sc)->sc_lock, SX_LOCKED);
 287 #define XN_RX_LOCK_ASSERT(_sc)    mtx_assert(&(_sc)->rx_lock, MA_OWNED);
 288 #define XN_TX_LOCK_ASSERT(_sc)    mtx_assert(&(_sc)->tx_lock, MA_OWNED);
 289 #define XN_LOCK_DESTROY(_sc)   mtx_destroy(&(_sc)->rx_lock); \
 290                                mtx_destroy(&(_sc)->tx_lock); \
 291                                sx_destroy(&(_sc)->sc_lock);
 292
 293 struct netfront_rx_info {
 294         struct netif_rx_response rx;
 295         struct netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
 296 };
 297
 298 #define netfront_carrier_on(netif)      ((netif)->carrier = 1)
 299 #define netfront_carrier_off(netif)     ((netif)->carrier = 0)
 300 #define netfront_carrier_ok(netif)      ((netif)->carrier)
 301
 302 /* Access macros for acquiring freeing slots in xn_free_{tx,rx}_idxs[]. */
 303
 304
 305
 306 /*
 307  * Access macros for acquiring freeing slots in tx_skbs[].
 308  */
 309
 310 static inline void
 311 add_id_to_freelist(struct mbuf **list, unsigned short id)
 312 {
 313         list[id] = list[0];
 314         list[0]  = (void *)(u_long)id;
 315 }
 316
 317 static inline unsigned short
 318 get_id_from_freelist(struct mbuf **list)
 319 {
 320         u_int id = (u_int)(u_long)list[0];
 321         list[0] = list[id];
 322         return (id);
 323 }
 324
 325 static inline int
 326 xennet_rxidx(RING_IDX idx)
 327 {
 328         return idx & (NET_RX_RING_SIZE - 1);
 329 }
 330
 331 static inline struct mbuf *
 332 xennet_get_rx_mbuf(struct netfront_info *np,
 333                                                 RING_IDX ri)
 334 {
 335         int i = xennet_rxidx(ri);
 336         struct mbuf *m;
 337
 338         m = np->rx_mbufs[i];
 339         np->rx_mbufs[i] = NULL;
 340         return (m);
 341 }
 342
 343 static inline grant_ref_t
 344 xennet_get_rx_ref(struct netfront_info *np, RING_IDX ri)
 345 {
 346         int i = xennet_rxidx(ri);
 347         grant_ref_t ref = np->grant_rx_ref[i];
 348         np->grant_rx_ref[i] = GRANT_INVALID_REF;
 349         return ref;
 350 }
 351
 352 #ifdef DEBUG
 353
 354 #endif
 355 #define IPRINTK(fmt, args...) \
 356     printf("[XEN] " fmt, ##args)
 357 #define WPRINTK(fmt, args...) \
 358     printf("[XEN] " fmt, ##args)
 359 #if 0
 360 #define DPRINTK(fmt, args...) \
 361     printf("[XEN] %s: " fmt, __func__, ##args)
 362 #else
 363 #define DPRINTK(fmt, args...)
 364 #endif
 365
 366 /**
 367  * Read the 'mac' node at the given device's node in the store, and parse that
 368  * as colon-separated octets, placing result the given mac array.  mac must be
 369  * a preallocated array of length ETH_ALEN (as declared in linux/if_ether.h).
 370  * Return 0 on success, or errno on error.
 371  */
 372 static int
 373 xen_net_read_mac(device_t dev, uint8_t mac[])
 374 {
 375         int error, i;
 376         char *s, *e, *macstr;
 377
 378         error = xenbus_read(XBT_NIL, xenbus_get_node(dev), "mac", NULL,
 379             (void **) &macstr);
 380         if (error)
 381                 return (error);
 382
 383         s = macstr;
 384         for (i = 0; i < ETHER_ADDR_LEN; i++) {
 385                 mac[i] = strtoul(s, &e, 16);
 386                 if (s == e || (e[0] != ':' && e[0] != 0)) {
 387                         free(macstr, M_DEVBUF);
 388                         return (ENOENT);
 389                 }
 390                 s = &e[1];
 391         }
 392         free(macstr, M_DEVBUF);
 393         return (0);
 394 }
 395
 396 /**
 397  * Entry point to this code when a new device is created.  Allocate the basic
 398  * structures and the ring buffers for communication with the backend, and
 399  * inform the backend of the appropriate details for those.  Switch to
 400  * Connected state.
 401  */
 402 static int
 403 netfront_probe(device_t dev)
 404 {
 405
 406         if (!strcmp(xenbus_get_type(dev), "vif")) {
 407                 device_set_desc(dev, "Virtual Network Interface");
 408                 return (0);
 409         }
 410
 411         return (ENXIO);
 412 }
 413
 414 static int
 415 netfront_attach(device_t dev)
 416 {
 417         int err;
 418
 419         err = create_netdev(dev);
 420         if (err) {
 421                 xenbus_dev_fatal(dev, err, "creating netdev");
 422                 return err;
 423         }
 424
 425 #if __FreeBSD_version >= 700000
 426         SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
 427             SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
 428             OID_AUTO, "enable_lro", CTLTYPE_INT|CTLFLAG_RW,
 429             &xn_enable_lro, 0, "Large Receive Offload");
 430 #endif
 431
 432         return 0;
 433 }
 434
 435
 436 /**
 437  * We are reconnecting to the backend, due to a suspend/resume, or a backend
 438  * driver restart.  We tear down our netif structure and recreate it, but
 439  * leave the device-layer structures intact so that this is transparent to the
 440  * rest of the kernel.
 441  */
 442 static int
 443 netfront_resume(device_t dev)
 444 {
 445         struct netfront_info *info = device_get_softc(dev);
 446
 447         netif_disconnect_backend(info);
 448         return (0);
 449 }
 450
 451
 452 /* Common code used when first setting up, and when resuming. */
 453 static int
 454 talk_to_backend(device_t dev, struct netfront_info *info)
 455 {
 456         const char *message;
 457         struct xenbus_transaction xbt;
 458         const char *node = xenbus_get_node(dev);
 459         int err;
 460
 461         err = xen_net_read_mac(dev, info->mac);
 462         if (err) {
 463                 xenbus_dev_fatal(dev, err, "parsing %s/mac", node);
 464                 goto out;
 465         }
 466
 467         /* Create shared ring, alloc event channel. */
 468         err = setup_device(dev, info);
 469         if (err)
 470                 goto out;
 471
 472  again:
 473         err = xenbus_transaction_start(&xbt);
 474         if (err) {
 475                 xenbus_dev_fatal(dev, err, "starting transaction");
 476                 goto destroy_ring;
 477         }
 478         err = xenbus_printf(xbt, node, "tx-ring-ref","%u",
 479                             info->tx_ring_ref);
 480         if (err) {
 481                 message = "writing tx ring-ref";
 482                 goto abort_transaction;
 483         }
 484         err = xenbus_printf(xbt, node, "rx-ring-ref","%u",
 485                             info->rx_ring_ref);
 486         if (err) {
 487                 message = "writing rx ring-ref";
 488                 goto abort_transaction;
 489         }
 490         err = xenbus_printf(xbt, node,
 491                 "event-channel", "%u", irq_to_evtchn_port(info->irq));
 492         if (err) {
 493                 message = "writing event-channel";
 494                 goto abort_transaction;
 495         }
 496         err = xenbus_printf(xbt, node, "request-rx-copy", "%u",
 497                             info->copying_receiver);
 498         if (err) {
 499                 message = "writing request-rx-copy";
 500                 goto abort_transaction;
 501         }
 502         err = xenbus_printf(xbt, node, "feature-rx-notify", "%d", 1);
 503         if (err) {
 504                 message = "writing feature-rx-notify";
 505                 goto abort_transaction;
 506         }
 507         err = xenbus_printf(xbt, node, "feature-sg", "%d", 1);
 508         if (err) {
 509                 message = "writing feature-sg";
 510                 goto abort_transaction;
 511         }
 512 #if __FreeBSD_version >= 700000
 513         err = xenbus_printf(xbt, node, "feature-gso-tcpv4", "%d", 1);
 514         if (err) {
 515                 message = "writing feature-gso-tcpv4";
 516                 goto abort_transaction;
 517         }
 518 #endif
 519
 520         err = xenbus_transaction_end(xbt, 0);
 521         if (err) {
 522                 if (err == EAGAIN)
 523                         goto again;
 524                 xenbus_dev_fatal(dev, err, "completing transaction");
 525                 goto destroy_ring;
 526         }
 527
 528         return 0;
 529
 530  abort_transaction:
 531         xenbus_transaction_end(xbt, 1);
 532         xenbus_dev_fatal(dev, err, "%s", message);
 533  destroy_ring:
 534         netif_free(info);
 535  out:
 536         return err;
 537 }
 538
 539
 540 static int
 541 setup_device(device_t dev, struct netfront_info *info)
 542 {
 543         netif_tx_sring_t *txs;
 544         netif_rx_sring_t *rxs;
 545         int error;
 546         struct ifnet *ifp;
 547
 548         ifp = info->xn_ifp;
 549
 550         info->tx_ring_ref = GRANT_INVALID_REF;
 551         info->rx_ring_ref = GRANT_INVALID_REF;
 552         info->rx.sring = NULL;
 553         info->tx.sring = NULL;
 554         info->irq = 0;
 555
 556         txs = (netif_tx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO);
 557         if (!txs) {
 558                 error = ENOMEM;
 559                 xenbus_dev_fatal(dev, error, "allocating tx ring page");
 560                 goto fail;
 561         }
 562         SHARED_RING_INIT(txs);
 563         FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
 564         error = xenbus_grant_ring(dev, virt_to_mfn(txs), &info->tx_ring_ref);
 565         if (error)
 566                 goto fail;
 567
 568         rxs = (netif_rx_sring_t *)malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT|M_ZERO);
 569         if (!rxs) {
 570                 error = ENOMEM;
 571                 xenbus_dev_fatal(dev, error, "allocating rx ring page");
 572                 goto fail;
 573         }
 574         SHARED_RING_INIT(rxs);
 575         FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
 576
 577         error = xenbus_grant_ring(dev, virt_to_mfn(rxs), &info->rx_ring_ref);
 578         if (error)
 579                 goto fail;
 580
 581         error = bind_listening_port_to_irqhandler(xenbus_get_otherend_id(dev),
 582             "xn", xn_intr, info, INTR_TYPE_NET | INTR_MPSAFE, &info->irq);
 583
 584         if (error) {
 585                 xenbus_dev_fatal(dev, error,
 586                                  "bind_evtchn_to_irqhandler failed");
 587                 goto fail;
 588         }
 589
 590         show_device(info);
 591
 592         return (0);
 593
 594  fail:
 595         netif_free(info);
 596         return (error);
 597 }
 598
 599 /**
 600  * If this interface has an ipv4 address, send an arp for it. This
 601  * helps to get the network going again after migrating hosts.
 602  */
 603 static void
 604 netfront_send_fake_arp(device_t dev, struct netfront_info *info)
 605 {
 606         struct ifnet *ifp;
 607         struct ifaddr *ifa;
 608
 609         ifp = info->xn_ifp;
 610         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 611                 if (ifa->ifa_addr->sa_family == AF_INET) {
 612                         arp_ifinit(ifp, ifa);
 613                 }
 614         }
 615 }
 616
 617 /**
 618  * Callback received when the backend's state changes.
 619  */
 620 static void
 621 netfront_backend_changed(device_t dev, XenbusState newstate)
 622 {
 623         struct netfront_info *sc = device_get_softc(dev);
 624
 625         DPRINTK("newstate=%d\n", newstate);
 626
 627         switch (newstate) {
 628         case XenbusStateInitialising:
 629         case XenbusStateInitialised:
 630         case XenbusStateConnected:
 631         case XenbusStateUnknown:
 632         case XenbusStateClosed:
 633         case XenbusStateReconfigured:
 634         case XenbusStateReconfiguring:
 635                 break;
 636         case XenbusStateInitWait:
 637                 if (xenbus_get_state(dev) != XenbusStateInitialising)
 638                         break;
 639                 if (network_connect(sc) != 0)
 640                         break;
 641                 xenbus_set_state(dev, XenbusStateConnected);
 642                 netfront_send_fake_arp(dev, sc);
 643                 break;
 644         case XenbusStateClosing:
 645                 xenbus_set_state(dev, XenbusStateClosed);
 646                 break;
 647         }
 648 }
 649
 650 static void
 651 xn_free_rx_ring(struct netfront_info *sc)
 652 {
 653 #if 0
 654         int i;
 655
 656         for (i = 0; i < NET_RX_RING_SIZE; i++) {
 657                 if (sc->xn_cdata.xn_rx_chain[i] != NULL) {
 658                         m_freem(sc->xn_cdata.xn_rx_chain[i]);
 659                         sc->xn_cdata.xn_rx_chain[i] = NULL;
 660                 }
 661         }
 662
 663         sc->rx.rsp_cons = 0;
 664         sc->xn_rx_if->req_prod = 0;
 665         sc->xn_rx_if->event = sc->rx.rsp_cons ;
 666 #endif
 667 }
 668
 669 static void
 670 xn_free_tx_ring(struct netfront_info *sc)
 671 {
 672 #if 0
 673         int i;
 674
 675         for (i = 0; i < NET_TX_RING_SIZE; i++) {
 676                 if (sc->xn_cdata.xn_tx_chain[i] != NULL) {
 677                         m_freem(sc->xn_cdata.xn_tx_chain[i]);
 678                         sc->xn_cdata.xn_tx_chain[i] = NULL;
 679                 }
 680         }
 681
 682         return;
 683 #endif
 684 }
 685
 686 static inline int
 687 netfront_tx_slot_available(struct netfront_info *np)
 688 {
 689         return ((np->tx.req_prod_pvt - np->tx.rsp_cons) <
 690                 (TX_MAX_TARGET - /* MAX_SKB_FRAGS */ 24 - 2));
 691 }
 692 static void
 693 netif_release_tx_bufs(struct netfront_info *np)
 694 {
 695         struct mbuf *m;
 696         int i;
 697
 698         for (i = 1; i <= NET_TX_RING_SIZE; i++) {
 699                 m = np->xn_cdata.xn_tx_chain[i];
 700
 701                 if (((u_long)m) < KERNBASE)
 702                         continue;
 703                 gnttab_grant_foreign_access_ref(np->grant_tx_ref[i],
 704                     xenbus_get_otherend_id(np->xbdev),
 705                     virt_to_mfn(mtod(m, vm_offset_t)),
 706                     GNTMAP_readonly);
 707                 gnttab_release_grant_reference(&np->gref_tx_head,
 708                     np->grant_tx_ref[i]);
 709                 np->grant_tx_ref[i] = GRANT_INVALID_REF;
 710                 add_id_to_freelist(np->tx_mbufs, i);
 711                 m_freem(m);
 712         }
 713 }
 714
 715 static void
 716 network_alloc_rx_buffers(struct netfront_info *sc)
 717 {
 718         int otherend_id = xenbus_get_otherend_id(sc->xbdev);
 719         unsigned short id;
 720         struct mbuf *m_new;
 721         int i, batch_target, notify;
 722         RING_IDX req_prod;
 723         struct xen_memory_reservation reservation;
 724         grant_ref_t ref;
 725         int nr_flips;
 726         netif_rx_request_t *req;
 727         vm_offset_t vaddr;
 728         u_long pfn;
 729
 730         req_prod = sc->rx.req_prod_pvt;
 731
 732         if (unlikely(sc->carrier == 0))
 733                 return;
 734
 735         /*
 736          * Allocate skbuffs greedily, even though we batch updates to the
 737          * receive ring. This creates a less bursty demand on the memory
 738          * allocator, so should reduce the chance of failed allocation
 739          * requests both for ourself and for other kernel subsystems.
 740          */
 741         batch_target = sc->rx_target - (req_prod - sc->rx.rsp_cons);
 742         for (i = mbufq_len(&sc->xn_rx_batch); i < batch_target; i++) {
 743                 MGETHDR(m_new, M_DONTWAIT, MT_DATA);
 744                 if (m_new == NULL)
 745                         goto no_mbuf;
 746
 747                 m_cljget(m_new, M_DONTWAIT, MJUMPAGESIZE);
 748                 if ((m_new->m_flags & M_EXT) == 0) {
 749                         m_freem(m_new);
 750
 751 no_mbuf:
 752                         if (i != 0)
 753                                 goto refill;
 754                         /*
 755                          * XXX set timer
 756                          */
 757                         break;
 758                 }
 759                 m_new->m_len = m_new->m_pkthdr.len = MJUMPAGESIZE;
 760
 761                 /* queue the mbufs allocated */
 762                 mbufq_tail(&sc->xn_rx_batch, m_new);
 763         }
 764
 765         /* Is the batch large enough to be worthwhile? */
 766         if (i < (sc->rx_target/2)) {
 767                 if (req_prod >sc->rx.sring->req_prod)
 768                         goto push;
 769                 return;
 770         }
 771         /* Adjust floating fill target if we risked running out of buffers. */
 772         if ( ((req_prod - sc->rx.sring->rsp_prod) < (sc->rx_target / 4)) &&
 773              ((sc->rx_target *= 2) > sc->rx_max_target) )
 774                 sc->rx_target = sc->rx_max_target;
 775
 776 refill:
 777         for (nr_flips = i = 0; ; i++) {
 778                 if ((m_new = mbufq_dequeue(&sc->xn_rx_batch)) == NULL)
 779                         break;
 780
 781                 m_new->m_ext.ext_arg1 = (vm_paddr_t *)(uintptr_t)(
 782                                 vtophys(m_new->m_ext.ext_buf) >> PAGE_SHIFT);
 783
 784                 id = xennet_rxidx(req_prod + i);
 785
 786                 KASSERT(sc->xn_cdata.xn_rx_chain[id] == NULL,
 787                     ("non-NULL xm_rx_chain"));
 788                 sc->xn_cdata.xn_rx_chain[id] = m_new;
 789
 790                 ref = gnttab_claim_grant_reference(&sc->gref_rx_head);
 791                 KASSERT((short)ref >= 0, ("negative ref"));
 792                 sc->grant_rx_ref[id] = ref;
 793
 794                 vaddr = mtod(m_new, vm_offset_t);
 795                 pfn = vtophys(vaddr) >> PAGE_SHIFT;
 796                 req = RING_GET_REQUEST(&sc->rx, req_prod + i);
 797
 798                 if (sc->copying_receiver == 0) {
 799                         gnttab_grant_foreign_transfer_ref(ref,
 800                             otherend_id, pfn);
 801                         sc->rx_pfn_array[nr_flips] = PFNTOMFN(pfn);
 802                         if (!xen_feature(XENFEAT_auto_translated_physmap)) {
 803                                 /* Remove this page before passing
 804                                  * back to Xen.
 805                                  */
 806                                 set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
 807                                 MULTI_update_va_mapping(&sc->rx_mcl[i],
 808                                     vaddr, 0, 0);
 809                         }
 810                         nr_flips++;
 811                 } else {
 812                         gnttab_grant_foreign_access_ref(ref,
 813                             otherend_id,
 814                             PFNTOMFN(pfn), 0);
 815                 }
 816                 req->id = id;
 817                 req->gref = ref;
 818
 819                 sc->rx_pfn_array[i] =
 820                     vtomach(mtod(m_new,vm_offset_t)) >> PAGE_SHIFT;
 821         }
 822
 823         KASSERT(i, ("no mbufs processed")); /* should have returned earlier */
 824         KASSERT(mbufq_len(&sc->xn_rx_batch) == 0, ("not all mbufs processed"));
 825         /*
 826          * We may have allocated buffers which have entries outstanding
 827          * in the page * update queue -- make sure we flush those first!
 828          */
 829         PT_UPDATES_FLUSH();
 830         if (nr_flips != 0) {
 831 #ifdef notyet
 832                 /* Tell the ballon driver what is going on. */
 833                 balloon_update_driver_allowance(i);
 834 #endif
 835                 set_xen_guest_handle(reservation.extent_start, sc->rx_pfn_array);
 836                 reservation.nr_extents   = i;
 837                 reservation.extent_order = 0;
 838                 reservation.address_bits = 0;
 839                 reservation.domid        = DOMID_SELF;
 840
 841                 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
 842
 843                         /* After all PTEs have been zapped, flush the TLB. */
 844                         sc->rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] =
 845                             UVMF_TLB_FLUSH|UVMF_ALL;
 846
 847                         /* Give away a batch of pages. */
 848                         sc->rx_mcl[i].op = __HYPERVISOR_memory_op;
 849                         sc->rx_mcl[i].args[0] = XENMEM_decrease_reservation;
 850                         sc->rx_mcl[i].args[1] =  (u_long)&reservation;
 851                         /* Zap PTEs and give away pages in one big multicall. */
 852                         (void)HYPERVISOR_multicall(sc->rx_mcl, i+1);
 853
 854                         /* Check return status of HYPERVISOR_dom_mem_op(). */
 855                         if (unlikely(sc->rx_mcl[i].result != i))
 856                                 panic("Unable to reduce memory reservation\n");
 857                         } else {
 858                                 if (HYPERVISOR_memory_op(
 859                                     XENMEM_decrease_reservation, &reservation)
 860                                     != i)
 861                                         panic("Unable to reduce memory "
 862                                             "reservation\n");
 863                 }
 864         } else {
 865                 wmb();
 866         }
 867
 868         /* Above is a suitable barrier to ensure backend will see requests. */
 869         sc->rx.req_prod_pvt = req_prod + i;
 870 push:
 871         RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->rx, notify);
 872         if (notify)
 873                 notify_remote_via_irq(sc->irq);
 874 }
 875
 876 static void
 877 xn_rxeof(struct netfront_info *np)
 878 {
 879         struct ifnet *ifp;
 880 #if __FreeBSD_version >= 700000
 881         struct lro_ctrl *lro = &np->xn_lro;
 882         struct lro_entry *queued;
 883 #endif
 884         struct netfront_rx_info rinfo;
 885         struct netif_rx_response *rx = &rinfo.rx;
 886         struct netif_extra_info *extras = rinfo.extras;
 887         RING_IDX i, rp;
 888         multicall_entry_t *mcl;
 889         struct mbuf *m;
 890         struct mbuf_head rxq, errq;
 891         int err, pages_flipped = 0, work_to_do;
 892
 893         do {
 894                 XN_RX_LOCK_ASSERT(np);
 895                 if (!netfront_carrier_ok(np))
 896                         return;
 897
 898                 mbufq_init(&errq);
 899                 mbufq_init(&rxq);
 900
 901                 ifp = np->xn_ifp;
 902
 903                 rp = np->rx.sring->rsp_prod;
 904                 rmb();  /* Ensure we see queued responses up to 'rp'. */
 905
 906                 i = np->rx.rsp_cons;
 907                 while ((i != rp)) {
 908                         memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
 909                         memset(extras, 0, sizeof(rinfo.extras));
 910
 911                         m = NULL;
 912                         err = xennet_get_responses(np, &rinfo, rp, &m,
 913                             &pages_flipped);
 914
 915                         if (unlikely(err)) {
 916                                 if (m)
 917                                         mbufq_tail(&errq, m);
 918                                 np->stats.rx_errors++;
 919                                 i = np->rx.rsp_cons;
 920                                 continue;
 921                         }
 922
 923                         m->m_pkthdr.rcvif = ifp;
 924                         if ( rx->flags & NETRXF_data_validated ) {
 925                                 /* Tell the stack the checksums are okay */
 926                                 /*
 927                                  * XXX this isn't necessarily the case - need to add
 928                                  * check
 929                                  */
 930
 931                                 m->m_pkthdr.csum_flags |=
 932                                         (CSUM_IP_CHECKED | CSUM_IP_VALID | CSUM_DATA_VALID
 933                                             | CSUM_PSEUDO_HDR);
 934                                 m->m_pkthdr.csum_data = 0xffff;
 935                         }
 936
 937                         np->stats.rx_packets++;
 938                         np->stats.rx_bytes += m->m_pkthdr.len;
 939
 940                         mbufq_tail(&rxq, m);
 941                         np->rx.rsp_cons = ++i;
 942                 }
 943
 944                 if (pages_flipped) {
 945                         /* Some pages are no longer absent... */
 946 #ifdef notyet
 947                         balloon_update_driver_allowance(-pages_flipped);
 948 #endif
 949                         /* Do all the remapping work, and M->P updates, in one big
 950                          * hypercall.
 951                          */
 952                         if (!!xen_feature(XENFEAT_auto_translated_physmap)) {
 953                                 mcl = np->rx_mcl + pages_flipped;
 954                                 mcl->op = __HYPERVISOR_mmu_update;
 955                                 mcl->args[0] = (u_long)np->rx_mmu;
 956                                 mcl->args[1] = pages_flipped;
 957                                 mcl->args[2] = 0;
 958                                 mcl->args[3] = DOMID_SELF;
 959                                 (void)HYPERVISOR_multicall(np->rx_mcl,
 960                                     pages_flipped + 1);
 961                         }
 962                 }
 963
 964                 while ((m = mbufq_dequeue(&errq)))
 965                         m_freem(m);
 966
 967                 /*
 968                  * Process all the mbufs after the remapping is complete.
 969                  * Break the mbuf chain first though.
 970                  */
 971                 while ((m = mbufq_dequeue(&rxq)) != NULL) {
 972                         ifp->if_ipackets++;
 973
 974                         /*
 975                          * Do we really need to drop the rx lock?
 976                          */
 977                         XN_RX_UNLOCK(np);
 978 #if __FreeBSD_version >= 700000
 979                         /* Use LRO if possible */
 980                         if ((ifp->if_capenable & IFCAP_LRO) == 0 ||
 981                             lro->lro_cnt == 0 || tcp_lro_rx(lro, m, 0)) {
 982                                 /*
 983                                  * If LRO fails, pass up to the stack
 984                                  * directly.
 985                                  */
 986                                 (*ifp->if_input)(ifp, m);
 987                         }
 988 #else
 989                         (*ifp->if_input)(ifp, m);
 990 #endif
 991                         XN_RX_LOCK(np);
 992                 }
 993
 994                 np->rx.rsp_cons = i;
 995
 996 #if __FreeBSD_version >= 700000
 997                 /*
 998                  * Flush any outstanding LRO work
 999                  */
1000                 while (!SLIST_EMPTY(&lro->lro_active)) {
1001                         queued = SLIST_FIRST(&lro->lro_active);
1002                         SLIST_REMOVE_HEAD(&lro->lro_active, next);
1003                         tcp_lro_flush(lro, queued);
1004                 }
1005 #endif
1006
1007 #if 0
1008                 /* If we get a callback with very few responses, reduce fill target. */
1009                 /* NB. Note exponential increase, linear decrease. */
1010                 if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
1011                         ((3*np->rx_target) / 4)) && (--np->rx_target < np->rx_min_target))
1012                         np->rx_target = np->rx_min_target;
1013 #endif
1014
1015                 network_alloc_rx_buffers(np);
1016
1017                 RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, work_to_do);
1018         } while (work_to_do);
1019 }
1020
1021 static void
1022 xn_txeof(struct netfront_info *np)
1023 {
1024         RING_IDX i, prod;
1025         unsigned short id;
1026         struct ifnet *ifp;
1027         netif_tx_response_t *txr;
1028         struct mbuf *m;
1029
1030         XN_TX_LOCK_ASSERT(np);
1031
1032         if (!netfront_carrier_ok(np))
1033                 return;
1034
1035         ifp = np->xn_ifp;
1036         ifp->if_timer = 0;
1037
1038         do {
1039                 prod = np->tx.sring->rsp_prod;
1040                 rmb(); /* Ensure we see responses up to 'rp'. */
1041
1042                 for (i = np->tx.rsp_cons; i != prod; i++) {
1043                         txr = RING_GET_RESPONSE(&np->tx, i);
1044                         if (txr->status == NETIF_RSP_NULL)
1045                                 continue;
1046
1047                         id = txr->id;
1048                         m = np->xn_cdata.xn_tx_chain[id];
1049
1050                         /*
1051                          * Increment packet count if this is the last
1052                          * mbuf of the chain.
1053                          */
1054                         if (!m->m_next)
1055                                 ifp->if_opackets++;
1056                         KASSERT(m != NULL, ("mbuf not found in xn_tx_chain"));
1057                         M_ASSERTVALID(m);
1058                         if (unlikely(gnttab_query_foreign_access(
1059                             np->grant_tx_ref[id]) != 0)) {
1060                                 printf("network_tx_buf_gc: warning "
1061                                     "-- grant still in use by backend "
1062                                     "domain.\n");
1063                                 goto out;
1064                         }
1065                         gnttab_end_foreign_access_ref(
1066                                 np->grant_tx_ref[id]);
1067                         gnttab_release_grant_reference(
1068                                 &np->gref_tx_head, np->grant_tx_ref[id]);
1069                         np->grant_tx_ref[id] = GRANT_INVALID_REF;
1070
1071                         np->xn_cdata.xn_tx_chain[id] = NULL;
1072                         add_id_to_freelist(np->xn_cdata.xn_tx_chain, id);
1073                         m_free(m);
1074                 }
1075                 np->tx.rsp_cons = prod;
1076
1077                 /*
1078                  * Set a new event, then check for race with update of
1079                  * tx_cons. Note that it is essential to schedule a
1080                  * callback, no matter how few buffers are pending. Even if
1081                  * there is space in the transmit ring, higher layers may
1082                  * be blocked because too much data is outstanding: in such
1083                  * cases notification from Xen is likely to be the only kick
1084                  * that we'll get.
1085                  */
1086                 np->tx.sring->rsp_event =
1087                     prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
1088
1089                 mb();
1090
1091         } while (prod != np->tx.sring->rsp_prod);
1092
1093  out:
1094         if (np->tx_full &&
1095             ((np->tx.sring->req_prod - prod) < NET_TX_RING_SIZE)) {
1096                 np->tx_full = 0;
1097 #if 0
1098                 if (np->user_state == UST_OPEN)
1099                         netif_wake_queue(dev);
1100 #endif
1101         }
1102
1103 }
1104
1105 static void
1106 xn_intr(void *xsc)
1107 {
1108         struct netfront_info *np = xsc;
1109         struct ifnet *ifp = np->xn_ifp;
1110
1111 #if 0
1112         if (!(np->rx.rsp_cons != np->rx.sring->rsp_prod &&
1113             likely(netfront_carrier_ok(np)) &&
1114             ifp->if_drv_flags & IFF_DRV_RUNNING))
1115                 return;
1116 #endif
1117         if (np->tx.rsp_cons != np->tx.sring->rsp_prod) {
1118                 XN_TX_LOCK(np);
1119                 xn_txeof(np);
1120                 XN_TX_UNLOCK(np);
1121         }
1122
1123         XN_RX_LOCK(np);
1124         xn_rxeof(np);
1125         XN_RX_UNLOCK(np);
1126
1127         if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1128             !IFQ_DRV_IS_EMPTY(&ifp->if_snd))
1129                 xn_start(ifp);
1130 }
1131
1132
1133 static void
1134 xennet_move_rx_slot(struct netfront_info *np, struct mbuf *m,
1135         grant_ref_t ref)
1136 {
1137         int new = xennet_rxidx(np->rx.req_prod_pvt);
1138
1139         KASSERT(np->rx_mbufs[new] == NULL, ("rx_mbufs != NULL"));
1140         np->rx_mbufs[new] = m;
1141         np->grant_rx_ref[new] = ref;
1142         RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
1143         RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
1144         np->rx.req_prod_pvt++;
1145 }
1146
1147 static int
1148 xennet_get_extras(struct netfront_info *np,
1149     struct netif_extra_info *extras, RING_IDX rp)
1150 {
1151         struct netif_extra_info *extra;
1152         RING_IDX cons = np->rx.rsp_cons;
1153
1154         int err = 0;
1155
1156         do {
1157                 struct mbuf *m;
1158                 grant_ref_t ref;
1159
1160                 if (unlikely(cons + 1 == rp)) {
1161 #if 0
1162                         if (net_ratelimit())
1163                                 WPRINTK("Missing extra info\n");
1164 #endif
1165                         err = -EINVAL;
1166                         break;
1167                 }
1168
1169                 extra = (struct netif_extra_info *)
1170                 RING_GET_RESPONSE(&np->rx, ++cons);
1171
1172                 if (unlikely(!extra->type ||
1173                         extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
1174 #if 0
1175                         if (net_ratelimit())
1176                                 WPRINTK("Invalid extra type: %d\n",
1177                                         extra->type);
1178 #endif
1179                         err = -EINVAL;
1180                 } else {
1181                         memcpy(&extras[extra->type - 1], extra, sizeof(*extra));
1182                 }
1183
1184                 m = xennet_get_rx_mbuf(np, cons);
1185                 ref = xennet_get_rx_ref(np, cons);
1186                 xennet_move_rx_slot(np, m, ref);
1187         } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
1188
1189         np->rx.rsp_cons = cons;
1190         return err;
1191 }
1192
1193 static int
1194 xennet_get_responses(struct netfront_info *np,
1195         struct netfront_rx_info *rinfo, RING_IDX rp,
1196         struct mbuf  **list,
1197         int *pages_flipped_p)
1198 {
1199         int pages_flipped = *pages_flipped_p;
1200         struct mmu_update *mmu;
1201         struct multicall_entry *mcl;
1202         struct netif_rx_response *rx = &rinfo->rx;
1203         struct netif_extra_info *extras = rinfo->extras;
1204         RING_IDX cons = np->rx.rsp_cons;
1205         struct mbuf *m, *m0, *m_prev;
1206         grant_ref_t ref = xennet_get_rx_ref(np, cons);
1207         int max = 5 /* MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD) */;
1208         int frags = 1;
1209         int err = 0;
1210         u_long ret;
1211
1212         m0 = m = m_prev = xennet_get_rx_mbuf(np, cons);
1213
1214
1215         if (rx->flags & NETRXF_extra_info) {
1216                 err = xennet_get_extras(np, extras, rp);
1217                 cons = np->rx.rsp_cons;
1218         }
1219
1220
1221         if (m0 != NULL) {
1222                         m0->m_pkthdr.len = 0;
1223                         m0->m_next = NULL;
1224         }
1225
1226         for (;;) {
1227                 u_long mfn;
1228
1229 #if 0
1230                 printf("rx->status=%hd rx->offset=%hu frags=%u\n",
1231                         rx->status, rx->offset, frags);
1232 #endif
1233                 if (unlikely(rx->status < 0 ||
1234                         rx->offset + rx->status > PAGE_SIZE)) {
1235 #if 0
1236                         if (net_ratelimit())
1237                                 WPRINTK("rx->offset: %x, size: %u\n",
1238                                         rx->offset, rx->status);
1239 #endif
1240                         xennet_move_rx_slot(np, m, ref);
1241                         err = -EINVAL;
1242                         goto next;
1243                 }
1244
1245                 /*
1246                  * This definitely indicates a bug, either in this driver or in
1247                  * the backend driver. In future this should flag the bad
1248                  * situation to the system controller to reboot the backed.
1249                  */
1250                 if (ref == GRANT_INVALID_REF) {
1251 #if 0
1252                         if (net_ratelimit())
1253                                 WPRINTK("Bad rx response id %d.\n", rx->id);
1254 #endif
1255                         err = -EINVAL;
1256                         goto next;
1257                 }
1258
1259                 if (!np->copying_receiver) {
1260                         /* Memory pressure, insufficient buffer
1261                          * headroom, ...
1262                          */
1263                         if (!(mfn = gnttab_end_foreign_transfer_ref(ref))) {
1264                                 if (net_ratelimit())
1265                                         WPRINTK("Unfulfilled rx req "
1266                                                 "(id=%d, st=%d).\n",
1267                                                 rx->id, rx->status);
1268                                 xennet_move_rx_slot(np, m, ref);
1269                                 err = -ENOMEM;
1270                                 goto next;
1271                         }
1272
1273                         if (!xen_feature( XENFEAT_auto_translated_physmap)) {
1274                                 /* Remap the page. */
1275                                 void *vaddr = mtod(m, void *);
1276                                 uint32_t pfn;
1277
1278                                 mcl = np->rx_mcl + pages_flipped;
1279                                 mmu = np->rx_mmu + pages_flipped;
1280
1281                                 MULTI_update_va_mapping(mcl, (u_long)vaddr,
1282                                     (((vm_paddr_t)mfn) << PAGE_SHIFT) | PG_RW |
1283                                     PG_V | PG_M | PG_A, 0);
1284                                 pfn = (uintptr_t)m->m_ext.ext_arg1;
1285                                 mmu->ptr = ((vm_paddr_t)mfn << PAGE_SHIFT) |
1286                                     MMU_MACHPHYS_UPDATE;
1287                                 mmu->val = pfn;
1288
1289                                 set_phys_to_machine(pfn, mfn);
1290                         }
1291                         pages_flipped++;
1292                 } else {
1293                         ret = gnttab_end_foreign_access_ref(ref);
1294                         KASSERT(ret, ("ret != 0"));
1295                 }
1296
1297                 gnttab_release_grant_reference(&np->gref_rx_head, ref);
1298
1299 next:
1300                 if (m != NULL) {
1301                                 m->m_len = rx->status;
1302                                 m->m_data += rx->offset;
1303                                 m0->m_pkthdr.len += rx->status;
1304                 }
1305
1306                 if (!(rx->flags & NETRXF_more_data))
1307                         break;
1308
1309                 if (cons + frags == rp) {
1310                         if (net_ratelimit())
1311                                 WPRINTK("Need more frags\n");
1312                         err = -ENOENT;
1313                                 break;
1314                 }
1315                 m_prev = m;
1316
1317                 rx = RING_GET_RESPONSE(&np->rx, cons + frags);
1318                 m = xennet_get_rx_mbuf(np, cons + frags);
1319
1320                 m_prev->m_next = m;
1321                 m->m_next = NULL;
1322                 ref = xennet_get_rx_ref(np, cons + frags);
1323                 frags++;
1324         }
1325         *list = m0;
1326
1327         if (unlikely(frags > max)) {
1328                 if (net_ratelimit())
1329                         WPRINTK("Too many frags\n");
1330                 err = -E2BIG;
1331         }
1332
1333         if (unlikely(err))
1334                 np->rx.rsp_cons = cons + frags;
1335
1336         *pages_flipped_p = pages_flipped;
1337
1338         return err;
1339 }
1340
1341 static void
1342 xn_tick_locked(struct netfront_info *sc)
1343 {
1344         XN_RX_LOCK_ASSERT(sc);
1345         callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc);
1346
1347         /* XXX placeholder for printing debug information */
1348
1349 }
1350
1351
1352 static void
1353 xn_tick(void *xsc)
1354 {
1355         struct netfront_info *sc;
1356
1357         sc = xsc;
1358         XN_RX_LOCK(sc);
1359         xn_tick_locked(sc);
1360         XN_RX_UNLOCK(sc);
1361
1362 }
1363 static void
1364 xn_start_locked(struct ifnet *ifp)
1365 {
1366         int otherend_id;
1367         unsigned short id;
1368         struct mbuf *m_head, *m;
1369         struct netfront_info *sc;
1370         netif_tx_request_t *tx;
1371         netif_extra_info_t *extra;
1372         RING_IDX i;
1373         grant_ref_t ref;
1374         u_long mfn, tx_bytes;
1375         int notify, nfrags;
1376
1377         sc = ifp->if_softc;
1378         otherend_id = xenbus_get_otherend_id(sc->xbdev);
1379         tx_bytes = 0;
1380
1381         if (!netfront_carrier_ok(sc))
1382                 return;
1383
1384         for (i = sc->tx.req_prod_pvt; TRUE; i++) {
1385                 IF_DEQUEUE(&ifp->if_snd, m_head);
1386                 if (m_head == NULL)
1387                         break;
1388
1389                 if (!netfront_tx_slot_available(sc)) {
1390                         IF_PREPEND(&ifp->if_snd, m_head);
1391                         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
1392                         break;
1393                 }
1394
1395
1396                 /*
1397                  * Defragment the mbuf if necessary.
1398                  */
1399                 for (m = m_head, nfrags = 0; m; m = m->m_next)
1400                         nfrags++;
1401                 if (nfrags > MAX_SKB_FRAGS) {
1402                         m = m_defrag(m_head, M_DONTWAIT);
1403                         if (!m) {
1404                                 m_freem(m_head);
1405                                 break;
1406                         }
1407                         m_head = m;
1408                 }
1409
1410                 /*
1411                  * Start packing the mbufs in this chain into
1412                  * the fragment pointers. Stop when we run out
1413                  * of fragments or hit the end of the mbuf chain.
1414                  */
1415                 m = m_head;
1416                 extra = NULL;
1417                 for (m = m_head; m; m = m->m_next) {
1418                         tx = RING_GET_REQUEST(&sc->tx, i);
1419                         id = get_id_from_freelist(sc->xn_cdata.xn_tx_chain);
1420                         sc->xn_cdata.xn_tx_chain[id] = m;
1421                         tx->id = id;
1422                         ref = gnttab_claim_grant_reference(&sc->gref_tx_head);
1423                         KASSERT((short)ref >= 0, ("Negative ref"));
1424                         mfn = virt_to_mfn(mtod(m, vm_offset_t));
1425                         gnttab_grant_foreign_access_ref(ref, otherend_id,
1426                             mfn, GNTMAP_readonly);
1427                         tx->gref = sc->grant_tx_ref[id] = ref;
1428                         tx->offset = mtod(m, vm_offset_t) & (PAGE_SIZE - 1);
1429                         tx->flags = 0;
1430                         if (m == m_head) {
1431                                 /*
1432                                  * The first fragment has the entire packet
1433                                  * size, subsequent fragments have just the
1434                                  * fragment size. The backend works out the
1435                                  * true size of the first fragment by
1436                                  * subtracting the sizes of the other
1437                                  * fragments.
1438                                  */
1439                                 tx->size = m->m_pkthdr.len;
1440
1441                                 /*
1442                                  * The first fragment contains the
1443                                  * checksum flags and is optionally
1444                                  * followed by extra data for TSO etc.
1445                                  */
1446                                 if (m->m_pkthdr.csum_flags
1447                                     & CSUM_DELAY_DATA) {
1448                                         tx->flags |= (NETTXF_csum_blank
1449                                             | NETTXF_data_validated);
1450                                 }
1451 #if __FreeBSD_version >= 700000
1452                                 if (m->m_pkthdr.csum_flags & CSUM_TSO) {
1453                                         struct netif_extra_info *gso =
1454                                                 (struct netif_extra_info *)
1455                                                 RING_GET_REQUEST(&sc->tx, ++i);
1456
1457                                         if (extra)
1458                                                 extra->flags |= XEN_NETIF_EXTRA_FLAG_MORE;
1459                                         else
1460                                                 tx->flags |= NETTXF_extra_info;
1461
1462                                         gso->u.gso.size = m->m_pkthdr.tso_segsz;
1463                                         gso->u.gso.type =
1464                                                 XEN_NETIF_GSO_TYPE_TCPV4;
1465                                         gso->u.gso.pad = 0;
1466                                         gso->u.gso.features = 0;
1467
1468                                         gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
1469                                         gso->flags = 0;
1470                                         extra = gso;
1471                                 }
1472 #endif
1473                         } else {
1474                                 tx->size = m->m_len;
1475                         }
1476                         if (m->m_next) {
1477                                 tx->flags |= NETTXF_more_data;
1478                                 i++;
1479                         }
1480                 }
1481
1482                 BPF_MTAP(ifp, m_head);
1483
1484                 sc->stats.tx_bytes += m_head->m_pkthdr.len;
1485                 sc->stats.tx_packets++;
1486         }
1487
1488         sc->tx.req_prod_pvt = i;
1489         RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&sc->tx, notify);
1490         if (notify)
1491                 notify_remote_via_irq(sc->irq);
1492
1493         xn_txeof(sc);
1494
1495         if (RING_FULL(&sc->tx)) {
1496                 sc->tx_full = 1;
1497 #if 0
1498                 netif_stop_queue(dev);
1499 #endif
1500         }
1501
1502         return;
1503 }
1504
1505 static void
1506 xn_start(struct ifnet *ifp)
1507 {
1508         struct netfront_info *sc;
1509         sc = ifp->if_softc;
1510         XN_TX_LOCK(sc);
1511         xn_start_locked(ifp);
1512         XN_TX_UNLOCK(sc);
1513 }
1514
1515 /* equivalent of network_open() in Linux */
1516 static void
1517 xn_ifinit_locked(struct netfront_info *sc)
1518 {
1519         struct ifnet *ifp;
1520
1521         XN_LOCK_ASSERT(sc);
1522
1523         ifp = sc->xn_ifp;
1524
1525         if (ifp->if_drv_flags & IFF_DRV_RUNNING)
1526                 return;
1527
1528         xn_stop(sc);
1529
1530         network_alloc_rx_buffers(sc);
1531         sc->rx.sring->rsp_event = sc->rx.rsp_cons + 1;
1532
1533         ifp->if_drv_flags |= IFF_DRV_RUNNING;
1534         ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1535
1536         callout_reset(&sc->xn_stat_ch, hz, xn_tick, sc);
1537
1538 }
1539
1540
1541 static void
1542 xn_ifinit(void *xsc)
1543 {
1544         struct netfront_info *sc = xsc;
1545
1546         XN_LOCK(sc);
1547         xn_ifinit_locked(sc);
1548         XN_UNLOCK(sc);
1549
1550 }
1551
1552
1553 static int
1554 xn_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
1555 {
1556         struct netfront_info *sc = ifp->if_softc;
1557         struct ifreq *ifr = (struct ifreq *) data;
1558         struct ifaddr *ifa = (struct ifaddr *)data;
1559
1560         int mask, error = 0;
1561         switch(cmd) {
1562         case SIOCSIFADDR:
1563         case SIOCGIFADDR:
1564                 XN_LOCK(sc);
1565                 if (ifa->ifa_addr->sa_family == AF_INET) {
1566                         ifp->if_flags |= IFF_UP;
1567                         if (!(ifp->if_drv_flags & IFF_DRV_RUNNING))
1568                                 xn_ifinit_locked(sc);
1569                         arp_ifinit(ifp, ifa);
1570                         XN_UNLOCK(sc);
1571                 } else {
1572                         XN_UNLOCK(sc);
1573                         error = ether_ioctl(ifp, cmd, data);
1574                 }
1575                 break;
1576         case SIOCSIFMTU:
1577                 /* XXX can we alter the MTU on a VN ?*/
1578 #ifdef notyet
1579                 if (ifr->ifr_mtu > XN_JUMBO_MTU)
1580                         error = EINVAL;
1581                 else
1582 #endif
1583                 {
1584                         ifp->if_mtu = ifr->ifr_mtu;
1585                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1586                         xn_ifinit(sc);
1587                 }
1588                 break;
1589         case SIOCSIFFLAGS:
1590                 XN_LOCK(sc);
1591                 if (ifp->if_flags & IFF_UP) {
1592                         /*
1593                          * If only the state of the PROMISC flag changed,
1594                          * then just use the 'set promisc mode' command
1595                          * instead of reinitializing the entire NIC. Doing
1596                          * a full re-init means reloading the firmware and
1597                          * waiting for it to start up, which may take a
1598                          * second or two.
1599                          */
1600 #ifdef notyet
1601                         /* No promiscuous mode with Xen */
1602                         if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1603                             ifp->if_flags & IFF_PROMISC &&
1604                             !(sc->xn_if_flags & IFF_PROMISC)) {
1605                                 XN_SETBIT(sc, XN_RX_MODE,
1606                                           XN_RXMODE_RX_PROMISC);
1607                         } else if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
1608                                    !(ifp->if_flags & IFF_PROMISC) &&
1609                                    sc->xn_if_flags & IFF_PROMISC) {
1610                                 XN_CLRBIT(sc, XN_RX_MODE,
1611                                           XN_RXMODE_RX_PROMISC);
1612                         } else
1613 #endif
1614                                 xn_ifinit_locked(sc);
1615                 } else {
1616                         if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1617                                 xn_stop(sc);
1618                         }
1619                 }
1620                 sc->xn_if_flags = ifp->if_flags;
1621                 XN_UNLOCK(sc);
1622                 error = 0;
1623                 break;
1624         case SIOCSIFCAP:
1625                 mask = ifr->ifr_reqcap ^ ifp->if_capenable;
1626                 if (mask & IFCAP_TXCSUM) {
1627                         if (IFCAP_TXCSUM & ifp->if_capenable) {
1628                                 ifp->if_capenable &= ~(IFCAP_TXCSUM|IFCAP_TSO4);
1629                                 ifp->if_hwassist &= ~(CSUM_TCP | CSUM_UDP
1630                                     | CSUM_IP | CSUM_TSO);
1631                         } else {
1632                                 ifp->if_capenable |= IFCAP_TXCSUM;
1633                                 ifp->if_hwassist |= (CSUM_TCP | CSUM_UDP
1634                                     | CSUM_IP);
1635                         }
1636                 }
1637                 if (mask & IFCAP_RXCSUM) {
1638                         ifp->if_capenable ^= IFCAP_RXCSUM;
1639                 }
1640 #if __FreeBSD_version >= 700000
1641                 if (mask & IFCAP_TSO4) {
1642                         if (IFCAP_TSO4 & ifp->if_capenable) {
1643                                 ifp->if_capenable &= ~IFCAP_TSO4;
1644                                 ifp->if_hwassist &= ~CSUM_TSO;
1645                         } else if (IFCAP_TXCSUM & ifp->if_capenable) {
1646                                 ifp->if_capenable |= IFCAP_TSO4;
1647                                 ifp->if_hwassist |= CSUM_TSO;
1648                         } else {
1649                                 DPRINTK("Xen requires tx checksum offload"
1650                                     " be enabled to use TSO\n");
1651                                 error = EINVAL;
1652                         }
1653                 }
1654                 if (mask & IFCAP_LRO) {
1655                         ifp->if_capenable ^= IFCAP_LRO;
1656
1657                 }
1658 #endif
1659                 error = 0;
1660                 break;
1661         case SIOCADDMULTI:
1662         case SIOCDELMULTI:
1663 #ifdef notyet
1664                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1665                         XN_LOCK(sc);
1666                         xn_setmulti(sc);
1667                         XN_UNLOCK(sc);
1668                         error = 0;
1669                 }
1670 #endif
1671                 /* FALLTHROUGH */
1672         case SIOCSIFMEDIA:
1673         case SIOCGIFMEDIA:
1674                 error = EINVAL;
1675                 break;
1676         default:
1677                 error = ether_ioctl(ifp, cmd, data);
1678         }
1679
1680         return (error);
1681 }
1682
1683 static void
1684 xn_stop(struct netfront_info *sc)
1685 {
1686         struct ifnet *ifp;
1687
1688         XN_LOCK_ASSERT(sc);
1689
1690         ifp = sc->xn_ifp;
1691
1692         callout_stop(&sc->xn_stat_ch);
1693
1694         xn_free_rx_ring(sc);
1695         xn_free_tx_ring(sc);
1696
1697         ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
1698 }
1699
1700 /* START of Xenolinux helper functions adapted to FreeBSD */
1701 int
1702 network_connect(struct netfront_info *np)
1703 {
1704         int i, requeue_idx, error;
1705         grant_ref_t ref;
1706         netif_rx_request_t *req;
1707         u_int feature_rx_copy, feature_rx_flip;
1708
1709         error = xenbus_scanf(XBT_NIL, xenbus_get_otherend_path(np->xbdev),
1710             "feature-rx-copy", NULL, "%u", &feature_rx_copy);
1711         if (error)
1712                 feature_rx_copy = 0;
1713         error = xenbus_scanf(XBT_NIL, xenbus_get_otherend_path(np->xbdev),
1714             "feature-rx-flip", NULL, "%u", &feature_rx_flip);
1715         if (error)
1716                 feature_rx_flip = 1;
1717
1718         /*
1719          * Copy packets on receive path if:
1720          *  (a) This was requested by user, and the backend supports it; or
1721          *  (b) Flipping was requested, but this is unsupported by the backend.
1722          */
1723         np->copying_receiver = ((MODPARM_rx_copy && feature_rx_copy) ||
1724                                 (MODPARM_rx_flip && !feature_rx_flip));
1725
1726         XN_LOCK(np);
1727         /* Recovery procedure: */
1728         error = talk_to_backend(np->xbdev, np);
1729         if (error)
1730                 return (error);
1731
1732         /* Step 1: Reinitialise variables. */
1733         netif_release_tx_bufs(np);
1734
1735         /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
1736         for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
1737                 struct mbuf *m;
1738                 u_long pfn;
1739
1740                 if (np->rx_mbufs[i] == NULL)
1741                         continue;
1742
1743                 m = np->rx_mbufs[requeue_idx] = xennet_get_rx_mbuf(np, i);
1744                 ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
1745                 req = RING_GET_REQUEST(&np->rx, requeue_idx);
1746                 pfn = vtophys(mtod(m, vm_offset_t)) >> PAGE_SHIFT;
1747
1748                 if (!np->copying_receiver) {
1749                         gnttab_grant_foreign_transfer_ref(ref,
1750                             xenbus_get_otherend_id(np->xbdev),
1751                             pfn);
1752                 } else {
1753                         gnttab_grant_foreign_access_ref(ref,
1754                             xenbus_get_otherend_id(np->xbdev),
1755                             PFNTOMFN(pfn), 0);
1756                 }
1757                 req->gref = ref;
1758                 req->id   = requeue_idx;
1759
1760                 requeue_idx++;
1761         }
1762
1763         np->rx.req_prod_pvt = requeue_idx;
1764
1765         /* Step 3: All public and private state should now be sane.  Get
1766          * ready to start sending and receiving packets and give the driver
1767          * domain a kick because we've probably just requeued some
1768          * packets.
1769          */
1770         netfront_carrier_on(np);
1771         notify_remote_via_irq(np->irq);
1772         XN_TX_LOCK(np);
1773         xn_txeof(np);
1774         XN_TX_UNLOCK(np);
1775         network_alloc_rx_buffers(np);
1776         XN_UNLOCK(np);
1777
1778         return (0);
1779 }
1780
1781 static void
1782 show_device(struct netfront_info *sc)
1783 {
1784 #ifdef DEBUG
1785         if (sc) {
1786                 IPRINTK("<vif handle=%u %s(%s) evtchn=%u irq=%u tx=%p rx=%p>\n",
1787                         sc->xn_ifno,
1788                         be_state_name[sc->xn_backend_state],
1789                         sc->xn_user_state ? "open" : "closed",
1790                         sc->xn_evtchn,
1791                         sc->xn_irq,
1792                         sc->xn_tx_if,
1793                         sc->xn_rx_if);
1794         } else {
1795                 IPRINTK("<vif NULL>\n");
1796         }
1797 #endif
1798 }
1799
1800 /** Create a network device.
1801  * @param handle device handle
1802  */
1803 int
1804 create_netdev(device_t dev)
1805 {
1806         int i;
1807         struct netfront_info *np;
1808         int err;
1809         struct ifnet *ifp;
1810
1811         np = device_get_softc(dev);
1812
1813         np->xbdev         = dev;
1814
1815         XN_LOCK_INIT(np, xennetif);
1816         np->rx_target     = RX_MIN_TARGET;
1817         np->rx_min_target = RX_MIN_TARGET;
1818         np->rx_max_target = RX_MAX_TARGET;
1819
1820         /* Initialise {tx,rx}_skbs to be a free chain containing every entry. */
1821         for (i = 0; i <= NET_TX_RING_SIZE; i++) {
1822                 np->tx_mbufs[i] = (void *) ((u_long) i+1);
1823                 np->grant_tx_ref[i] = GRANT_INVALID_REF;
1824         }
1825         for (i = 0; i <= NET_RX_RING_SIZE; i++) {
1826                 np->rx_mbufs[i] = NULL;
1827                 np->grant_rx_ref[i] = GRANT_INVALID_REF;
1828         }
1829         /* A grant for every tx ring slot */
1830         if (gnttab_alloc_grant_references(TX_MAX_TARGET,
1831                                           &np->gref_tx_head) < 0) {
1832                 printf("#### netfront can't alloc tx grant refs\n");
1833                 err = ENOMEM;
1834                 goto exit;
1835         }
1836         /* A grant for every rx ring slot */
1837         if (gnttab_alloc_grant_references(RX_MAX_TARGET,
1838                                           &np->gref_rx_head) < 0) {
1839                 printf("#### netfront can't alloc rx grant refs\n");
1840                 gnttab_free_grant_references(np->gref_tx_head);
1841                 err = ENOMEM;
1842                 goto exit;
1843         }
1844
1845         err = xen_net_read_mac(dev, np->mac);
1846         if (err) {
1847                 xenbus_dev_fatal(dev, err, "parsing %s/mac",
1848                     xenbus_get_node(dev));
1849                 goto out;
1850         }
1851
1852         /* Set up ifnet structure */
1853         ifp = np->xn_ifp = if_alloc(IFT_ETHER);
1854         ifp->if_softc = np;
1855         if_initname(ifp, "xn",  device_get_unit(dev));
1856         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
1857         ifp->if_ioctl = xn_ioctl;
1858         ifp->if_output = ether_output;
1859         ifp->if_start = xn_start;
1860 #ifdef notyet
1861         ifp->if_watchdog = xn_watchdog;
1862 #endif
1863         ifp->if_init = xn_ifinit;
1864         ifp->if_mtu = ETHERMTU;
1865         ifp->if_snd.ifq_maxlen = NET_TX_RING_SIZE - 1;
1866
1867         ifp->if_hwassist = XN_CSUM_FEATURES;
1868         ifp->if_capabilities = IFCAP_HWCSUM;
1869 #if __FreeBSD_version >= 700000
1870         ifp->if_capabilities |= IFCAP_TSO4;
1871         if (xn_enable_lro) {
1872                 int err = tcp_lro_init(&np->xn_lro);
1873                 if (err) {
1874                         device_printf(dev, "LRO initialization failed\n");
1875                         goto exit;
1876                 }
1877                 np->xn_lro.ifp = ifp;
1878                 ifp->if_capabilities |= IFCAP_LRO;
1879         }
1880 #endif
1881         ifp->if_capenable = ifp->if_capabilities;
1882
1883         ether_ifattach(ifp, np->mac);
1884         callout_init(&np->xn_stat_ch, CALLOUT_MPSAFE);
1885         netfront_carrier_off(np);
1886
1887         return (0);
1888
1889 exit:
1890         gnttab_free_grant_references(np->gref_tx_head);
1891 out:
1892         panic("do something smart");
1893
1894 }
1895
1896 /**
1897  * Handle the change of state of the backend to Closing.  We must delete our
1898  * device-layer structures now, to ensure that writes are flushed through to
1899  * the backend.  Once is this done, we can switch to Closed in
1900  * acknowledgement.
1901  */
1902 #if 0
1903 static void netfront_closing(device_t dev)
1904 {
1905 #if 0
1906         struct netfront_info *info = dev->dev_driver_data;
1907
1908         DPRINTK("netfront_closing: %s removed\n", dev->nodename);
1909
1910         close_netdev(info);
1911 #endif
1912         xenbus_switch_state(dev, XenbusStateClosed);
1913 }
1914 #endif
1915
1916 static int netfront_detach(device_t dev)
1917 {
1918         struct netfront_info *info = device_get_softc(dev);
1919
1920         DPRINTK("%s\n", xenbus_get_node(dev));
1921
1922         netif_free(info);
1923
1924         return 0;
1925 }
1926
1927
1928 static void netif_free(struct netfront_info *info)
1929 {
1930         netif_disconnect_backend(info);
1931 #if 0
1932         close_netdev(info);
1933 #endif
1934 }
1935
1936 static void netif_disconnect_backend(struct netfront_info *info)
1937 {
1938         XN_RX_LOCK(info);
1939         XN_TX_LOCK(info);
1940         netfront_carrier_off(info);
1941         XN_TX_UNLOCK(info);
1942         XN_RX_UNLOCK(info);
1943
1944         end_access(info->tx_ring_ref, info->tx.sring);
1945         end_access(info->rx_ring_ref, info->rx.sring);
1946         info->tx_ring_ref = GRANT_INVALID_REF;
1947         info->rx_ring_ref = GRANT_INVALID_REF;
1948         info->tx.sring = NULL;
1949         info->rx.sring = NULL;
1950
1951         if (info->irq)
1952                 unbind_from_irqhandler(info->irq);
1953
1954         info->irq = 0;
1955 }
1956
1957
1958 static void end_access(int ref, void *page)
1959 {
1960         if (ref != GRANT_INVALID_REF)
1961                 gnttab_end_foreign_access(ref, page);
1962 }
1963
1964 /* ** Driver registration ** */
1965 static device_method_t netfront_methods[] = {
1966         /* Device interface */
1967         DEVMETHOD(device_probe,         netfront_probe),
1968         DEVMETHOD(device_attach,        netfront_attach),
1969         DEVMETHOD(device_detach,        netfront_detach),
1970         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
1971         DEVMETHOD(device_suspend,       bus_generic_suspend),
1972         DEVMETHOD(device_resume,        netfront_resume),
1973
1974         /* Xenbus interface */
1975         DEVMETHOD(xenbus_backend_changed, netfront_backend_changed),
1976
1977         { 0, 0 }
1978 };
1979
1980 static driver_t netfront_driver = {
1981         "xn",
1982         netfront_methods,
1983         sizeof(struct netfront_info),
1984 };
1985 devclass_t netfront_devclass;
1986
1987 DRIVER_MODULE(xe, xenbus, netfront_driver, netfront_devclass, 0, 0);