drivers/scsi/fcoe/fcoe.c

   1 /*
   2  * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Maintained at www.Open-FCoE.org
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/if_ether.h>
  26 #include <linux/if_vlan.h>
  27 #include <linux/crc32.h>
  28 #include <linux/slab.h>
  29 #include <linux/cpu.h>
  30 #include <linux/fs.h>
  31 #include <linux/sysfs.h>
  32 #include <linux/ctype.h>
  33 #include <linux/workqueue.h>
  34 #include <net/dcbnl.h>
  35 #include <net/dcbevent.h>
  36 #include <scsi/scsi_tcq.h>
  37 #include <scsi/scsicam.h>
  38 #include <scsi/scsi_transport.h>
  39 #include <scsi/scsi_transport_fc.h>
  40 #include <net/rtnetlink.h>
  41
  42 #include <scsi/fc/fc_encaps.h>
  43 #include <scsi/fc/fc_fip.h>
  44 #include <scsi/fc/fc_fcoe.h>
  45
  46 #include <scsi/libfc.h>
  47 #include <scsi/fc_frame.h>
  48 #include <scsi/libfcoe.h>
  49
  50 #include "fcoe.h"
  51
  52 MODULE_AUTHOR("Open-FCoE.org");
  53 MODULE_DESCRIPTION("FCoE");
  54 MODULE_LICENSE("GPL v2");
  55
  56 /* Performance tuning parameters for fcoe */
  57 static unsigned int fcoe_ddp_min = 4096;
  58 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
  59 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for "      \
  60                  "Direct Data Placement (DDP).");
  61
  62 unsigned int fcoe_debug_logging;
  63 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
  64 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
  65
  66 static DEFINE_MUTEX(fcoe_config_mutex);
  67
  68 static struct workqueue_struct *fcoe_wq;
  69
  70 /* fcoe_percpu_clean completion.  Waiter protected by fcoe_create_mutex */
  71 static DECLARE_COMPLETION(fcoe_flush_completion);
  72
  73 /* fcoe host list */
  74 /* must only by accessed under the RTNL mutex */
  75 static LIST_HEAD(fcoe_hostlist);
  76 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
  77
  78 /* Function Prototypes */
  79 static int fcoe_reset(struct Scsi_Host *);
  80 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
  81 static int fcoe_rcv(struct sk_buff *, struct net_device *,
  82                     struct packet_type *, struct net_device *);
  83 static int fcoe_percpu_receive_thread(void *);
  84 static void fcoe_percpu_clean(struct fc_lport *);
  85 static int fcoe_link_ok(struct fc_lport *);
  86
  87 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
  88 static int fcoe_hostlist_add(const struct fc_lport *);
  89 static void fcoe_hostlist_del(const struct fc_lport *);
  90
  91 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
  92 static void fcoe_dev_setup(void);
  93 static void fcoe_dev_cleanup(void);
  94 static struct fcoe_interface
  95 *fcoe_hostlist_lookup_port(const struct net_device *);
  96
  97 static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
  98                          struct packet_type *, struct net_device *);
  99
 100 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
 101 static void fcoe_update_src_mac(struct fc_lport *, u8 *);
 102 static u8 *fcoe_get_src_mac(struct fc_lport *);
 103 static void fcoe_destroy_work(struct work_struct *);
 104
 105 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
 106                           unsigned int);
 107 static int fcoe_ddp_done(struct fc_lport *, u16);
 108 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *,
 109                            unsigned int);
 110 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
 111 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
 112                                      ulong event, void *ptr);
 113
 114 static bool fcoe_match(struct net_device *netdev);
 115 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode);
 116 static int fcoe_destroy(struct net_device *netdev);
 117 static int fcoe_enable(struct net_device *netdev);
 118 static int fcoe_disable(struct net_device *netdev);
 119
 120 /* fcoe_syfs control interface handlers */
 121 static int fcoe_ctlr_alloc(struct net_device *netdev);
 122 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev);
 123
 124
 125 static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
 126                                       u32 did, struct fc_frame *,
 127                                       unsigned int op,
 128                                       void (*resp)(struct fc_seq *,
 129                                                    struct fc_frame *,
 130                                                    void *),
 131                                       void *, u32 timeout);
 132 static void fcoe_recv_frame(struct sk_buff *skb);
 133
 134 /* notification function for packets from net device */
 135 static struct notifier_block fcoe_notifier = {
 136         .notifier_call = fcoe_device_notification,
 137 };
 138
 139 /* notification function for CPU hotplug events */
 140 static struct notifier_block fcoe_cpu_notifier = {
 141         .notifier_call = fcoe_cpu_callback,
 142 };
 143
 144 /* notification function for DCB events */
 145 static struct notifier_block dcb_notifier = {
 146         .notifier_call = fcoe_dcb_app_notification,
 147 };
 148
 149 static struct scsi_transport_template *fcoe_nport_scsi_transport;
 150 static struct scsi_transport_template *fcoe_vport_scsi_transport;
 151
 152 static int fcoe_vport_destroy(struct fc_vport *);
 153 static int fcoe_vport_create(struct fc_vport *, bool disabled);
 154 static int fcoe_vport_disable(struct fc_vport *, bool disable);
 155 static void fcoe_set_vport_symbolic_name(struct fc_vport *);
 156 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
 157 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *);
 158
 159 static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
 160         .set_fcoe_ctlr_mode = fcoe_ctlr_set_fip_mode,
 161         .set_fcoe_ctlr_enabled = fcoe_ctlr_enabled,
 162         .get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb,
 163         .get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb,
 164         .get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb,
 165         .get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb,
 166         .get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb,
 167         .get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb,
 168
 169         .get_fcoe_fcf_selected = fcoe_fcf_get_selected,
 170         .get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id,
 171 };
 172
 173 static struct libfc_function_template fcoe_libfc_fcn_templ = {
 174         .frame_send = fcoe_xmit,
 175         .ddp_setup = fcoe_ddp_setup,
 176         .ddp_done = fcoe_ddp_done,
 177         .ddp_target = fcoe_ddp_target,
 178         .elsct_send = fcoe_elsct_send,
 179         .get_lesb = fcoe_get_lesb,
 180         .lport_set_port_id = fcoe_set_port_id,
 181 };
 182
 183 static struct fc_function_template fcoe_nport_fc_functions = {
 184         .show_host_node_name = 1,
 185         .show_host_port_name = 1,
 186         .show_host_supported_classes = 1,
 187         .show_host_supported_fc4s = 1,
 188         .show_host_active_fc4s = 1,
 189         .show_host_maxframe_size = 1,
 190         .show_host_serial_number = 1,
 191         .show_host_manufacturer = 1,
 192         .show_host_model = 1,
 193         .show_host_model_description = 1,
 194         .show_host_hardware_version = 1,
 195         .show_host_driver_version = 1,
 196         .show_host_firmware_version = 1,
 197         .show_host_optionrom_version = 1,
 198
 199         .show_host_port_id = 1,
 200         .show_host_supported_speeds = 1,
 201         .get_host_speed = fc_get_host_speed,
 202         .show_host_speed = 1,
 203         .show_host_port_type = 1,
 204         .get_host_port_state = fc_get_host_port_state,
 205         .show_host_port_state = 1,
 206         .show_host_symbolic_name = 1,
 207
 208         .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
 209         .show_rport_maxframe_size = 1,
 210         .show_rport_supported_classes = 1,
 211
 212         .show_host_fabric_name = 1,
 213         .show_starget_node_name = 1,
 214         .show_starget_port_name = 1,
 215         .show_starget_port_id = 1,
 216         .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
 217         .show_rport_dev_loss_tmo = 1,
 218         .get_fc_host_stats = fc_get_host_stats,
 219         .issue_fc_host_lip = fcoe_reset,
 220
 221         .terminate_rport_io = fc_rport_terminate_io,
 222
 223         .vport_create = fcoe_vport_create,
 224         .vport_delete = fcoe_vport_destroy,
 225         .vport_disable = fcoe_vport_disable,
 226         .set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
 227
 228         .bsg_request = fc_lport_bsg_request,
 229 };
 230
 231 static struct fc_function_template fcoe_vport_fc_functions = {
 232         .show_host_node_name = 1,
 233         .show_host_port_name = 1,
 234         .show_host_supported_classes = 1,
 235         .show_host_supported_fc4s = 1,
 236         .show_host_active_fc4s = 1,
 237         .show_host_maxframe_size = 1,
 238         .show_host_serial_number = 1,
 239         .show_host_manufacturer = 1,
 240         .show_host_model = 1,
 241         .show_host_model_description = 1,
 242         .show_host_hardware_version = 1,
 243         .show_host_driver_version = 1,
 244         .show_host_firmware_version = 1,
 245         .show_host_optionrom_version = 1,
 246
 247         .show_host_port_id = 1,
 248         .show_host_supported_speeds = 1,
 249         .get_host_speed = fc_get_host_speed,
 250         .show_host_speed = 1,
 251         .show_host_port_type = 1,
 252         .get_host_port_state = fc_get_host_port_state,
 253         .show_host_port_state = 1,
 254         .show_host_symbolic_name = 1,
 255
 256         .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
 257         .show_rport_maxframe_size = 1,
 258         .show_rport_supported_classes = 1,
 259
 260         .show_host_fabric_name = 1,
 261         .show_starget_node_name = 1,
 262         .show_starget_port_name = 1,
 263         .show_starget_port_id = 1,
 264         .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
 265         .show_rport_dev_loss_tmo = 1,
 266         .get_fc_host_stats = fc_get_host_stats,
 267         .issue_fc_host_lip = fcoe_reset,
 268
 269         .terminate_rport_io = fc_rport_terminate_io,
 270
 271         .bsg_request = fc_lport_bsg_request,
 272 };
 273
 274 static struct scsi_host_template fcoe_shost_template = {
 275         .module = THIS_MODULE,
 276         .name = "FCoE Driver",
 277         .proc_name = FCOE_NAME,
 278         .queuecommand = fc_queuecommand,
 279         .eh_abort_handler = fc_eh_abort,
 280         .eh_device_reset_handler = fc_eh_device_reset,
 281         .eh_host_reset_handler = fc_eh_host_reset,
 282         .slave_alloc = fc_slave_alloc,
 283         .change_queue_depth = fc_change_queue_depth,
 284         .change_queue_type = fc_change_queue_type,
 285         .this_id = -1,
 286         .cmd_per_lun = 3,
 287         .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
 288         .use_clustering = ENABLE_CLUSTERING,
 289         .sg_tablesize = SG_ALL,
 290         .max_sectors = 0xffff,
 291 };
 292
 293 /**
 294  * fcoe_interface_setup() - Setup a FCoE interface
 295  * @fcoe:   The new FCoE interface
 296  * @netdev: The net device that the fcoe interface is on
 297  *
 298  * Returns : 0 for success
 299  * Locking: must be called with the RTNL mutex held
 300  */
 301 static int fcoe_interface_setup(struct fcoe_interface *fcoe,
 302                                 struct net_device *netdev)
 303 {
 304         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
 305         struct netdev_hw_addr *ha;
 306         struct net_device *real_dev;
 307         u8 flogi_maddr[ETH_ALEN];
 308         const struct net_device_ops *ops;
 309
 310         fcoe->netdev = netdev;
 311
 312         /* Let LLD initialize for FCoE */
 313         ops = netdev->netdev_ops;
 314         if (ops->ndo_fcoe_enable) {
 315                 if (ops->ndo_fcoe_enable(netdev))
 316                         FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
 317                                         " specific feature for LLD.\n");
 318         }
 319
 320         /* Do not support for bonding device */
 321         if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) {
 322                 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
 323                 return -EOPNOTSUPP;
 324         }
 325
 326         /* look for SAN MAC address, if multiple SAN MACs exist, only
 327          * use the first one for SPMA */
 328         real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
 329                 vlan_dev_real_dev(netdev) : netdev;
 330         fcoe->realdev = real_dev;
 331         rcu_read_lock();
 332         for_each_dev_addr(real_dev, ha) {
 333                 if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
 334                     (is_valid_ether_addr(ha->addr))) {
 335                         memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
 336                         fip->spma = 1;
 337                         break;
 338                 }
 339         }
 340         rcu_read_unlock();
 341
 342         /* setup Source Mac Address */
 343         if (!fip->spma)
 344                 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
 345
 346         /*
 347          * Add FCoE MAC address as second unicast MAC address
 348          * or enter promiscuous mode if not capable of listening
 349          * for multiple unicast MACs.
 350          */
 351         memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
 352         dev_uc_add(netdev, flogi_maddr);
 353         if (fip->spma)
 354                 dev_uc_add(netdev, fip->ctl_src_addr);
 355         if (fip->mode == FIP_MODE_VN2VN) {
 356                 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
 357                 dev_mc_add(netdev, FIP_ALL_P2P_MACS);
 358         } else
 359                 dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
 360
 361         /*
 362          * setup the receive function from ethernet driver
 363          * on the ethertype for the given device
 364          */
 365         fcoe->fcoe_packet_type.func = fcoe_rcv;
 366         fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
 367         fcoe->fcoe_packet_type.dev = netdev;
 368         dev_add_pack(&fcoe->fcoe_packet_type);
 369
 370         fcoe->fip_packet_type.func = fcoe_fip_recv;
 371         fcoe->fip_packet_type.type = htons(ETH_P_FIP);
 372         fcoe->fip_packet_type.dev = netdev;
 373         dev_add_pack(&fcoe->fip_packet_type);
 374
 375         return 0;
 376 }
 377
 378 /**
 379  * fcoe_interface_create() - Create a FCoE interface on a net device
 380  * @netdev: The net device to create the FCoE interface on
 381  * @fip_mode: The mode to use for FIP
 382  *
 383  * Returns: pointer to a struct fcoe_interface or NULL on error
 384  */
 385 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
 386                                                     enum fip_state fip_mode)
 387 {
 388         struct fcoe_ctlr_device *ctlr_dev;
 389         struct fcoe_ctlr *ctlr;
 390         struct fcoe_interface *fcoe;
 391         int size;
 392         int err;
 393
 394         if (!try_module_get(THIS_MODULE)) {
 395                 FCOE_NETDEV_DBG(netdev,
 396                                 "Could not get a reference to the module\n");
 397                 fcoe = ERR_PTR(-EBUSY);
 398                 goto out;
 399         }
 400
 401         size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface);
 402         ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ,
 403                                         size);
 404         if (!ctlr_dev) {
 405                 FCOE_DBG("Failed to add fcoe_ctlr_device\n");
 406                 fcoe = ERR_PTR(-ENOMEM);
 407                 goto out_putmod;
 408         }
 409
 410         ctlr = fcoe_ctlr_device_priv(ctlr_dev);
 411         fcoe = fcoe_ctlr_priv(ctlr);
 412
 413         dev_hold(netdev);
 414
 415         /*
 416          * Initialize FIP.
 417          */
 418         fcoe_ctlr_init(ctlr, fip_mode);
 419         ctlr->send = fcoe_fip_send;
 420         ctlr->update_mac = fcoe_update_src_mac;
 421         ctlr->get_src_addr = fcoe_get_src_mac;
 422
 423         err = fcoe_interface_setup(fcoe, netdev);
 424         if (err) {
 425                 fcoe_ctlr_destroy(ctlr);
 426                 fcoe_ctlr_device_delete(ctlr_dev);
 427                 dev_put(netdev);
 428                 fcoe = ERR_PTR(err);
 429                 goto out_putmod;
 430         }
 431
 432         goto out;
 433
 434 out_putmod:
 435         module_put(THIS_MODULE);
 436 out:
 437         return fcoe;
 438 }
 439
 440 /**
 441  * fcoe_interface_remove() - remove FCoE interface from netdev
 442  * @fcoe: The FCoE interface to be cleaned up
 443  *
 444  * Caller must be holding the RTNL mutex
 445  */
 446 static void fcoe_interface_remove(struct fcoe_interface *fcoe)
 447 {
 448         struct net_device *netdev = fcoe->netdev;
 449         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
 450         u8 flogi_maddr[ETH_ALEN];
 451         const struct net_device_ops *ops;
 452
 453         /*
 454          * Don't listen for Ethernet packets anymore.
 455          * synchronize_net() ensures that the packet handlers are not running
 456          * on another CPU. dev_remove_pack() would do that, this calls the
 457          * unsyncronized version __dev_remove_pack() to avoid multiple delays.
 458          */
 459         __dev_remove_pack(&fcoe->fcoe_packet_type);
 460         __dev_remove_pack(&fcoe->fip_packet_type);
 461         synchronize_net();
 462
 463         /* Delete secondary MAC addresses */
 464         memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
 465         dev_uc_del(netdev, flogi_maddr);
 466         if (fip->spma)
 467                 dev_uc_del(netdev, fip->ctl_src_addr);
 468         if (fip->mode == FIP_MODE_VN2VN) {
 469                 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
 470                 dev_mc_del(netdev, FIP_ALL_P2P_MACS);
 471         } else
 472                 dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
 473
 474         /* Tell the LLD we are done w/ FCoE */
 475         ops = netdev->netdev_ops;
 476         if (ops->ndo_fcoe_disable) {
 477                 if (ops->ndo_fcoe_disable(netdev))
 478                         FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
 479                                         " specific feature for LLD.\n");
 480         }
 481         fcoe->removed = 1;
 482 }
 483
 484
 485 /**
 486  * fcoe_interface_cleanup() - Clean up a FCoE interface
 487  * @fcoe: The FCoE interface to be cleaned up
 488  */
 489 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
 490 {
 491         struct net_device *netdev = fcoe->netdev;
 492         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
 493
 494         rtnl_lock();
 495         if (!fcoe->removed)
 496                 fcoe_interface_remove(fcoe);
 497         rtnl_unlock();
 498
 499         /* Release the self-reference taken during fcoe_interface_create() */
 500         /* tear-down the FCoE controller */
 501         fcoe_ctlr_destroy(fip);
 502         scsi_host_put(fip->lp->host);
 503         dev_put(netdev);
 504         module_put(THIS_MODULE);
 505 }
 506
 507 /**
 508  * fcoe_fip_recv() - Handler for received FIP frames
 509  * @skb:      The receive skb
 510  * @netdev:   The associated net device
 511  * @ptype:    The packet_type structure which was used to register this handler
 512  * @orig_dev: The original net_device the the skb was received on.
 513  *            (in case dev is a bond)
 514  *
 515  * Returns: 0 for success
 516  */
 517 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
 518                          struct packet_type *ptype,
 519                          struct net_device *orig_dev)
 520 {
 521         struct fcoe_interface *fcoe;
 522         struct fcoe_ctlr *ctlr;
 523
 524         fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
 525         ctlr = fcoe_to_ctlr(fcoe);
 526         fcoe_ctlr_recv(ctlr, skb);
 527         return 0;
 528 }
 529
 530 /**
 531  * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
 532  * @port: The FCoE port
 533  * @skb: The FIP/FCoE packet to be sent
 534  */
 535 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
 536 {
 537         if (port->fcoe_pending_queue.qlen)
 538                 fcoe_check_wait_queue(port->lport, skb);
 539         else if (fcoe_start_io(skb))
 540                 fcoe_check_wait_queue(port->lport, skb);
 541 }
 542
 543 /**
 544  * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
 545  * @fip: The FCoE controller
 546  * @skb: The FIP packet to be sent
 547  */
 548 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
 549 {
 550         skb->dev = fcoe_from_ctlr(fip)->netdev;
 551         fcoe_port_send(lport_priv(fip->lp), skb);
 552 }
 553
 554 /**
 555  * fcoe_update_src_mac() - Update the Ethernet MAC filters
 556  * @lport: The local port to update the source MAC on
 557  * @addr:  Unicast MAC address to add
 558  *
 559  * Remove any previously-set unicast MAC filter.
 560  * Add secondary FCoE MAC address filter for our OUI.
 561  */
 562 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
 563 {
 564         struct fcoe_port *port = lport_priv(lport);
 565         struct fcoe_interface *fcoe = port->priv;
 566
 567         if (!is_zero_ether_addr(port->data_src_addr))
 568                 dev_uc_del(fcoe->netdev, port->data_src_addr);
 569         if (!is_zero_ether_addr(addr))
 570                 dev_uc_add(fcoe->netdev, addr);
 571         memcpy(port->data_src_addr, addr, ETH_ALEN);
 572 }
 573
 574 /**
 575  * fcoe_get_src_mac() - return the Ethernet source address for an lport
 576  * @lport: libfc lport
 577  */
 578 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
 579 {
 580         struct fcoe_port *port = lport_priv(lport);
 581
 582         return port->data_src_addr;
 583 }
 584
 585 /**
 586  * fcoe_lport_config() - Set up a local port
 587  * @lport: The local port to be setup
 588  *
 589  * Returns: 0 for success
 590  */
 591 static int fcoe_lport_config(struct fc_lport *lport)
 592 {
 593         lport->link_up = 0;
 594         lport->qfull = 0;
 595         lport->max_retry_count = 3;
 596         lport->max_rport_retry_count = 3;
 597         lport->e_d_tov = 2 * 1000;      /* FC-FS default */
 598         lport->r_a_tov = 2 * 2 * 1000;
 599         lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
 600                                  FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
 601         lport->does_npiv = 1;
 602
 603         fc_lport_init_stats(lport);
 604
 605         /* lport fc_lport related configuration */
 606         fc_lport_config(lport);
 607
 608         /* offload related configuration */
 609         lport->crc_offload = 0;
 610         lport->seq_offload = 0;
 611         lport->lro_enabled = 0;
 612         lport->lro_xid = 0;
 613         lport->lso_max = 0;
 614
 615         return 0;
 616 }
 617
 618 /**
 619  * fcoe_netdev_features_change - Updates the lport's offload flags based
 620  * on the LLD netdev's FCoE feature flags
 621  */
 622 static void fcoe_netdev_features_change(struct fc_lport *lport,
 623                                         struct net_device *netdev)
 624 {
 625         mutex_lock(&lport->lp_mutex);
 626
 627         if (netdev->features & NETIF_F_SG)
 628                 lport->sg_supp = 1;
 629         else
 630                 lport->sg_supp = 0;
 631
 632         if (netdev->features & NETIF_F_FCOE_CRC) {
 633                 lport->crc_offload = 1;
 634                 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
 635         } else {
 636                 lport->crc_offload = 0;
 637         }
 638
 639         if (netdev->features & NETIF_F_FSO) {
 640                 lport->seq_offload = 1;
 641                 lport->lso_max = netdev->gso_max_size;
 642                 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
 643                                 lport->lso_max);
 644         } else {
 645                 lport->seq_offload = 0;
 646                 lport->lso_max = 0;
 647         }
 648
 649         if (netdev->fcoe_ddp_xid) {
 650                 lport->lro_enabled = 1;
 651                 lport->lro_xid = netdev->fcoe_ddp_xid;
 652                 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
 653                                 lport->lro_xid);
 654         } else {
 655                 lport->lro_enabled = 0;
 656                 lport->lro_xid = 0;
 657         }
 658
 659         mutex_unlock(&lport->lp_mutex);
 660 }
 661
 662 /**
 663  * fcoe_netdev_config() - Set up net devive for SW FCoE
 664  * @lport:  The local port that is associated with the net device
 665  * @netdev: The associated net device
 666  *
 667  * Must be called after fcoe_lport_config() as it will use local port mutex
 668  *
 669  * Returns: 0 for success
 670  */
 671 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
 672 {
 673         u32 mfs;
 674         u64 wwnn, wwpn;
 675         struct fcoe_interface *fcoe;
 676         struct fcoe_ctlr *ctlr;
 677         struct fcoe_port *port;
 678
 679         /* Setup lport private data to point to fcoe softc */
 680         port = lport_priv(lport);
 681         fcoe = port->priv;
 682         ctlr = fcoe_to_ctlr(fcoe);
 683
 684         /*
 685          * Determine max frame size based on underlying device and optional
 686          * user-configured limit.  If the MFS is too low, fcoe_link_ok()
 687          * will return 0, so do this first.
 688          */
 689         mfs = netdev->mtu;
 690         if (netdev->features & NETIF_F_FCOE_MTU) {
 691                 mfs = FCOE_MTU;
 692                 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
 693         }
 694         mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
 695         if (fc_set_mfs(lport, mfs))
 696                 return -EINVAL;
 697
 698         /* offload features support */
 699         fcoe_netdev_features_change(lport, netdev);
 700
 701         skb_queue_head_init(&port->fcoe_pending_queue);
 702         port->fcoe_pending_queue_active = 0;
 703         setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
 704
 705         fcoe_link_speed_update(lport);
 706
 707         if (!lport->vport) {
 708                 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
 709                         wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
 710                 fc_set_wwnn(lport, wwnn);
 711                 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
 712                         wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
 713                                                  2, 0);
 714                 fc_set_wwpn(lport, wwpn);
 715         }
 716
 717         return 0;
 718 }
 719
 720 /**
 721  * fcoe_shost_config() - Set up the SCSI host associated with a local port
 722  * @lport: The local port
 723  * @dev:   The device associated with the SCSI host
 724  *
 725  * Must be called after fcoe_lport_config() and fcoe_netdev_config()
 726  *
 727  * Returns: 0 for success
 728  */
 729 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
 730 {
 731         int rc = 0;
 732
 733         /* lport scsi host config */
 734         lport->host->max_lun = FCOE_MAX_LUN;
 735         lport->host->max_id = FCOE_MAX_FCP_TARGET;
 736         lport->host->max_channel = 0;
 737         lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
 738
 739         if (lport->vport)
 740                 lport->host->transportt = fcoe_vport_scsi_transport;
 741         else
 742                 lport->host->transportt = fcoe_nport_scsi_transport;
 743
 744         /* add the new host to the SCSI-ml */
 745         rc = scsi_add_host(lport->host, dev);
 746         if (rc) {
 747                 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
 748                                 "error on scsi_add_host\n");
 749                 return rc;
 750         }
 751
 752         if (!lport->vport)
 753                 fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
 754
 755         snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
 756                  "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
 757                  fcoe_netdev(lport)->name);
 758
 759         return 0;
 760 }
 761
 762
 763 /**
 764  * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE
 765  * @lport:  The local port that is associated with the net device
 766  * @netdev: The associated net device
 767  *
 768  * Must be called after fcoe_shost_config() as it will use local port mutex
 769  *
 770  */
 771 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
 772 {
 773         struct fcoe_interface *fcoe;
 774         struct fcoe_port *port;
 775         struct net_device *realdev;
 776         int rc;
 777
 778         port = lport_priv(lport);
 779         fcoe = port->priv;
 780         realdev = fcoe->realdev;
 781
 782         if (!realdev)
 783                 return;
 784
 785         /* No FDMI state m/c for NPIV ports */
 786         if (lport->vport)
 787                 return;
 788
 789         if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
 790                 struct netdev_fcoe_hbainfo *fdmi;
 791                 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL);
 792                 if (!fdmi)
 793                         return;
 794
 795                 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
 796                                                                fdmi);
 797                 if (rc) {
 798                         printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
 799                                         "information from netdev.\n");
 800                         return;
 801                 }
 802
 803                 snprintf(fc_host_serial_number(lport->host),
 804                          FC_SERIAL_NUMBER_SIZE,
 805                          "%s",
 806                          fdmi->serial_number);
 807                 snprintf(fc_host_manufacturer(lport->host),
 808                          FC_SERIAL_NUMBER_SIZE,
 809                          "%s",
 810                          fdmi->manufacturer);
 811                 snprintf(fc_host_model(lport->host),
 812                          FC_SYMBOLIC_NAME_SIZE,
 813                          "%s",
 814                          fdmi->model);
 815                 snprintf(fc_host_model_description(lport->host),
 816                          FC_SYMBOLIC_NAME_SIZE,
 817                          "%s",
 818                          fdmi->model_description);
 819                 snprintf(fc_host_hardware_version(lport->host),
 820                          FC_VERSION_STRING_SIZE,
 821                          "%s",
 822                          fdmi->hardware_version);
 823                 snprintf(fc_host_driver_version(lport->host),
 824                          FC_VERSION_STRING_SIZE,
 825                          "%s",
 826                          fdmi->driver_version);
 827                 snprintf(fc_host_optionrom_version(lport->host),
 828                          FC_VERSION_STRING_SIZE,
 829                          "%s",
 830                          fdmi->optionrom_version);
 831                 snprintf(fc_host_firmware_version(lport->host),
 832                          FC_VERSION_STRING_SIZE,
 833                          "%s",
 834                          fdmi->firmware_version);
 835
 836                 /* Enable FDMI lport states */
 837                 lport->fdmi_enabled = 1;
 838                 kfree(fdmi);
 839         } else {
 840                 lport->fdmi_enabled = 0;
 841                 printk(KERN_INFO "fcoe: No FDMI support.\n");
 842         }
 843 }
 844
 845 /**
 846  * fcoe_oem_match() - The match routine for the offloaded exchange manager
 847  * @fp: The I/O frame
 848  *
 849  * This routine will be associated with an exchange manager (EM). When
 850  * the libfc exchange handling code is looking for an EM to use it will
 851  * call this routine and pass it the frame that it wishes to send. This
 852  * routine will return True if the associated EM is to be used and False
 853  * if the echange code should continue looking for an EM.
 854  *
 855  * The offload EM that this routine is associated with will handle any
 856  * packets that are for SCSI read requests.
 857  *
 858  * This has been enhanced to work when FCoE stack is operating in target
 859  * mode.
 860  *
 861  * Returns: True for read types I/O, otherwise returns false.
 862  */
 863 static bool fcoe_oem_match(struct fc_frame *fp)
 864 {
 865         struct fc_frame_header *fh = fc_frame_header_get(fp);
 866         struct fcp_cmnd *fcp;
 867
 868         if (fc_fcp_is_read(fr_fsp(fp)) &&
 869             (fr_fsp(fp)->data_len > fcoe_ddp_min))
 870                 return true;
 871         else if ((fr_fsp(fp) == NULL) &&
 872                  (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
 873                  (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
 874                 fcp = fc_frame_payload_get(fp, sizeof(*fcp));
 875                 if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
 876                     (ntohl(fcp->fc_dl) > fcoe_ddp_min))
 877                         return true;
 878         }
 879         return false;
 880 }
 881
 882 /**
 883  * fcoe_em_config() - Allocate and configure an exchange manager
 884  * @lport: The local port that the new EM will be associated with
 885  *
 886  * Returns: 0 on success
 887  */
 888 static inline int fcoe_em_config(struct fc_lport *lport)
 889 {
 890         struct fcoe_port *port = lport_priv(lport);
 891         struct fcoe_interface *fcoe = port->priv;
 892         struct fcoe_interface *oldfcoe = NULL;
 893         struct net_device *old_real_dev, *cur_real_dev;
 894         u16 min_xid = FCOE_MIN_XID;
 895         u16 max_xid = FCOE_MAX_XID;
 896
 897         /*
 898          * Check if need to allocate an em instance for
 899          * offload exchange ids to be shared across all VN_PORTs/lport.
 900          */
 901         if (!lport->lro_enabled || !lport->lro_xid ||
 902             (lport->lro_xid >= max_xid)) {
 903                 lport->lro_xid = 0;
 904                 goto skip_oem;
 905         }
 906
 907         /*
 908          * Reuse existing offload em instance in case
 909          * it is already allocated on real eth device
 910          */
 911         if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
 912                 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
 913         else
 914                 cur_real_dev = fcoe->netdev;
 915
 916         list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
 917                 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
 918                         old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
 919                 else
 920                         old_real_dev = oldfcoe->netdev;
 921
 922                 if (cur_real_dev == old_real_dev) {
 923                         fcoe->oem = oldfcoe->oem;
 924                         break;
 925                 }
 926         }
 927
 928         if (fcoe->oem) {
 929                 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
 930                         printk(KERN_ERR "fcoe_em_config: failed to add "
 931                                "offload em:%p on interface:%s\n",
 932                                fcoe->oem, fcoe->netdev->name);
 933                         return -ENOMEM;
 934                 }
 935         } else {
 936                 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
 937                                               FCOE_MIN_XID, lport->lro_xid,
 938                                               fcoe_oem_match);
 939                 if (!fcoe->oem) {
 940                         printk(KERN_ERR "fcoe_em_config: failed to allocate "
 941                                "em for offload exches on interface:%s\n",
 942                                fcoe->netdev->name);
 943                         return -ENOMEM;
 944                 }
 945         }
 946
 947         /*
 948          * Exclude offload EM xid range from next EM xid range.
 949          */
 950         min_xid += lport->lro_xid + 1;
 951
 952 skip_oem:
 953         if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
 954                 printk(KERN_ERR "fcoe_em_config: failed to "
 955                        "allocate em on interface %s\n", fcoe->netdev->name);
 956                 return -ENOMEM;
 957         }
 958
 959         return 0;
 960 }
 961
 962 /**
 963  * fcoe_if_destroy() - Tear down a SW FCoE instance
 964  * @lport: The local port to be destroyed
 965  *
 966  */
 967 static void fcoe_if_destroy(struct fc_lport *lport)
 968 {
 969         struct fcoe_port *port = lport_priv(lport);
 970         struct fcoe_interface *fcoe = port->priv;
 971         struct net_device *netdev = fcoe->netdev;
 972
 973         FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
 974
 975         /* Logout of the fabric */
 976         fc_fabric_logoff(lport);
 977
 978         /* Cleanup the fc_lport */
 979         fc_lport_destroy(lport);
 980
 981         /* Stop the transmit retry timer */
 982         del_timer_sync(&port->timer);
 983
 984         /* Free existing transmit skbs */
 985         fcoe_clean_pending_queue(lport);
 986
 987         rtnl_lock();
 988         if (!is_zero_ether_addr(port->data_src_addr))
 989                 dev_uc_del(netdev, port->data_src_addr);
 990         if (lport->vport)
 991                 synchronize_net();
 992         else
 993                 fcoe_interface_remove(fcoe);
 994         rtnl_unlock();
 995
 996         /* Free queued packets for the per-CPU receive threads */
 997         fcoe_percpu_clean(lport);
 998
 999         /* Detach from the scsi-ml */
1000         fc_remove_host(lport->host);
1001         scsi_remove_host(lport->host);
1002
1003         /* Destroy lport scsi_priv */
1004         fc_fcp_destroy(lport);
1005
1006         /* There are no more rports or I/O, free the EM */
1007         fc_exch_mgr_free(lport);
1008
1009         /* Free memory used by statistical counters */
1010         fc_lport_free_stats(lport);
1011
1012         /*
1013          * Release the Scsi_Host for vport but hold on to
1014          * master lport until it fcoe interface fully cleaned-up.
1015          */
1016         if (lport->vport)
1017                 scsi_host_put(lport->host);
1018 }
1019
1020 /**
1021  * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
1022  * @lport: The local port to setup DDP for
1023  * @xid:   The exchange ID for this DDP transfer
1024  * @sgl:   The scatterlist describing this transfer
1025  * @sgc:   The number of sg items
1026  *
1027  * Returns: 0 if the DDP context was not configured
1028  */
1029 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
1030                           struct scatterlist *sgl, unsigned int sgc)
1031 {
1032         struct net_device *netdev = fcoe_netdev(lport);
1033
1034         if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
1035                 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
1036                                                               xid, sgl,
1037                                                               sgc);
1038
1039         return 0;
1040 }
1041
1042 /**
1043  * fcoe_ddp_target() - Call a LLD's ddp_target through the net device
1044  * @lport: The local port to setup DDP for
1045  * @xid:   The exchange ID for this DDP transfer
1046  * @sgl:   The scatterlist describing this transfer
1047  * @sgc:   The number of sg items
1048  *
1049  * Returns: 0 if the DDP context was not configured
1050  */
1051 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid,
1052                            struct scatterlist *sgl, unsigned int sgc)
1053 {
1054         struct net_device *netdev = fcoe_netdev(lport);
1055
1056         if (netdev->netdev_ops->ndo_fcoe_ddp_target)
1057                 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
1058                                                                sgl, sgc);
1059
1060         return 0;
1061 }
1062
1063
1064 /**
1065  * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
1066  * @lport: The local port to complete DDP on
1067  * @xid:   The exchange ID for this DDP transfer
1068  *
1069  * Returns: the length of data that have been completed by DDP
1070  */
1071 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
1072 {
1073         struct net_device *netdev = fcoe_netdev(lport);
1074
1075         if (netdev->netdev_ops->ndo_fcoe_ddp_done)
1076                 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
1077         return 0;
1078 }
1079
1080 /**
1081  * fcoe_if_create() - Create a FCoE instance on an interface
1082  * @fcoe:   The FCoE interface to create a local port on
1083  * @parent: The device pointer to be the parent in sysfs for the SCSI host
1084  * @npiv:   Indicates if the port is a vport or not
1085  *
1086  * Creates a fc_lport instance and a Scsi_Host instance and configure them.
1087  *
1088  * Returns: The allocated fc_lport or an error pointer
1089  */
1090 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
1091                                        struct device *parent, int npiv)
1092 {
1093         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1094         struct net_device *netdev = fcoe->netdev;
1095         struct fc_lport *lport, *n_port;
1096         struct fcoe_port *port;
1097         struct Scsi_Host *shost;
1098         int rc;
1099         /*
1100          * parent is only a vport if npiv is 1,
1101          * but we'll only use vport in that case so go ahead and set it
1102          */
1103         struct fc_vport *vport = dev_to_vport(parent);
1104
1105         FCOE_NETDEV_DBG(netdev, "Create Interface\n");
1106
1107         if (!npiv)
1108                 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port));
1109         else
1110                 lport = libfc_vport_create(vport, sizeof(*port));
1111
1112         if (!lport) {
1113                 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
1114                 rc = -ENOMEM;
1115                 goto out;
1116         }
1117         port = lport_priv(lport);
1118         port->lport = lport;
1119         port->priv = fcoe;
1120         port->get_netdev = fcoe_netdev;
1121         port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
1122         port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
1123         INIT_WORK(&port->destroy_work, fcoe_destroy_work);
1124
1125         /*
1126          * Need to add the lport to the hostlist
1127          * so we catch NETDEV_CHANGE events.
1128          */
1129         fcoe_hostlist_add(lport);
1130
1131         /* configure a fc_lport including the exchange manager */
1132         rc = fcoe_lport_config(lport);
1133         if (rc) {
1134                 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
1135                                 "interface\n");
1136                 goto out_host_put;
1137         }
1138
1139         if (npiv) {
1140                 FCOE_NETDEV_DBG(netdev, "Setting vport names, "
1141                                 "%16.16llx %16.16llx\n",
1142                                 vport->node_name, vport->port_name);
1143                 fc_set_wwnn(lport, vport->node_name);
1144                 fc_set_wwpn(lport, vport->port_name);
1145         }
1146
1147         /* configure lport network properties */
1148         rc = fcoe_netdev_config(lport, netdev);
1149         if (rc) {
1150                 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
1151                                 "interface\n");
1152                 goto out_lp_destroy;
1153         }
1154
1155         /* configure lport scsi host properties */
1156         rc = fcoe_shost_config(lport, parent);
1157         if (rc) {
1158                 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
1159                                 "interface\n");
1160                 goto out_lp_destroy;
1161         }
1162
1163         /* Initialize the library */
1164         rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1);
1165         if (rc) {
1166                 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
1167                                 "interface\n");
1168                 goto out_lp_destroy;
1169         }
1170
1171         /* Initialized FDMI information */
1172         fcoe_fdmi_info(lport, netdev);
1173
1174         /*
1175          * fcoe_em_alloc() and fcoe_hostlist_add() both
1176          * need to be atomic with respect to other changes to the
1177          * hostlist since fcoe_em_alloc() looks for an existing EM
1178          * instance on host list updated by fcoe_hostlist_add().
1179          *
1180          * This is currently handled through the fcoe_config_mutex
1181          * begin held.
1182          */
1183         if (!npiv)
1184                 /* lport exch manager allocation */
1185                 rc = fcoe_em_config(lport);
1186         else {
1187                 shost = vport_to_shost(vport);
1188                 n_port = shost_priv(shost);
1189                 rc = fc_exch_mgr_list_clone(n_port, lport);
1190         }
1191
1192         if (rc) {
1193                 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
1194                 goto out_lp_destroy;
1195         }
1196
1197         return lport;
1198
1199 out_lp_destroy:
1200         fc_exch_mgr_free(lport);
1201 out_host_put:
1202         fcoe_hostlist_del(lport);
1203         scsi_host_put(lport->host);
1204 out:
1205         return ERR_PTR(rc);
1206 }
1207
1208 /**
1209  * fcoe_if_init() - Initialization routine for fcoe.ko
1210  *
1211  * Attaches the SW FCoE transport to the FC transport
1212  *
1213  * Returns: 0 on success
1214  */
1215 static int __init fcoe_if_init(void)
1216 {
1217         /* attach to scsi transport */
1218         fcoe_nport_scsi_transport =
1219                 fc_attach_transport(&fcoe_nport_fc_functions);
1220         fcoe_vport_scsi_transport =
1221                 fc_attach_transport(&fcoe_vport_fc_functions);
1222
1223         if (!fcoe_nport_scsi_transport) {
1224                 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1225                 return -ENODEV;
1226         }
1227
1228         return 0;
1229 }
1230
1231 /**
1232  * fcoe_if_exit() - Tear down fcoe.ko
1233  *
1234  * Detaches the SW FCoE transport from the FC transport
1235  *
1236  * Returns: 0 on success
1237  */
1238 static int __exit fcoe_if_exit(void)
1239 {
1240         fc_release_transport(fcoe_nport_scsi_transport);
1241         fc_release_transport(fcoe_vport_scsi_transport);
1242         fcoe_nport_scsi_transport = NULL;
1243         fcoe_vport_scsi_transport = NULL;
1244         return 0;
1245 }
1246
1247 /**
1248  * fcoe_percpu_thread_create() - Create a receive thread for an online CPU
1249  * @cpu: The CPU index of the CPU to create a receive thread for
1250  */
1251 static void fcoe_percpu_thread_create(unsigned int cpu)
1252 {
1253         struct fcoe_percpu_s *p;
1254         struct task_struct *thread;
1255
1256         p = &per_cpu(fcoe_percpu, cpu);
1257
1258         thread = kthread_create_on_node(fcoe_percpu_receive_thread,
1259                                         (void *)p, cpu_to_node(cpu),
1260                                         "fcoethread/%d", cpu);
1261
1262         if (likely(!IS_ERR(thread))) {
1263                 kthread_bind(thread, cpu);
1264                 wake_up_process(thread);
1265
1266                 spin_lock_bh(&p->fcoe_rx_list.lock);
1267                 p->thread = thread;
1268                 spin_unlock_bh(&p->fcoe_rx_list.lock);
1269         }
1270 }
1271
1272 /**
1273  * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
1274  * @cpu: The CPU index of the CPU whose receive thread is to be destroyed
1275  *
1276  * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
1277  * current CPU's Rx thread. If the thread being destroyed is bound to
1278  * the CPU processing this context the skbs will be freed.
1279  */
1280 static void fcoe_percpu_thread_destroy(unsigned int cpu)
1281 {
1282         struct fcoe_percpu_s *p;
1283         struct task_struct *thread;
1284         struct page *crc_eof;
1285         struct sk_buff *skb;
1286 #ifdef CONFIG_SMP
1287         struct fcoe_percpu_s *p0;
1288         unsigned targ_cpu = get_cpu();
1289 #endif /* CONFIG_SMP */
1290
1291         FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
1292
1293         /* Prevent any new skbs from being queued for this CPU. */
1294         p = &per_cpu(fcoe_percpu, cpu);
1295         spin_lock_bh(&p->fcoe_rx_list.lock);
1296         thread = p->thread;
1297         p->thread = NULL;
1298         crc_eof = p->crc_eof_page;
1299         p->crc_eof_page = NULL;
1300         p->crc_eof_offset = 0;
1301         spin_unlock_bh(&p->fcoe_rx_list.lock);
1302
1303 #ifdef CONFIG_SMP
1304         /*
1305          * Don't bother moving the skb's if this context is running
1306          * on the same CPU that is having its thread destroyed. This
1307          * can easily happen when the module is removed.
1308          */
1309         if (cpu != targ_cpu) {
1310                 p0 = &per_cpu(fcoe_percpu, targ_cpu);
1311                 spin_lock_bh(&p0->fcoe_rx_list.lock);
1312                 if (p0->thread) {
1313                         FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
1314                                  cpu, targ_cpu);
1315
1316                         while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1317                                 __skb_queue_tail(&p0->fcoe_rx_list, skb);
1318                         spin_unlock_bh(&p0->fcoe_rx_list.lock);
1319                 } else {
1320                         /*
1321                          * The targeted CPU is not initialized and cannot accept
1322                          * new  skbs. Unlock the targeted CPU and drop the skbs
1323                          * on the CPU that is going offline.
1324                          */
1325                         while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1326                                 kfree_skb(skb);
1327                         spin_unlock_bh(&p0->fcoe_rx_list.lock);
1328                 }
1329         } else {
1330                 /*
1331                  * This scenario occurs when the module is being removed
1332                  * and all threads are being destroyed. skbs will continue
1333                  * to be shifted from the CPU thread that is being removed
1334                  * to the CPU thread associated with the CPU that is processing
1335                  * the module removal. Once there is only one CPU Rx thread it
1336                  * will reach this case and we will drop all skbs and later
1337                  * stop the thread.
1338                  */
1339                 spin_lock_bh(&p->fcoe_rx_list.lock);
1340                 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1341                         kfree_skb(skb);
1342                 spin_unlock_bh(&p->fcoe_rx_list.lock);
1343         }
1344         put_cpu();
1345 #else
1346         /*
1347          * This a non-SMP scenario where the singular Rx thread is
1348          * being removed. Free all skbs and stop the thread.
1349          */
1350         spin_lock_bh(&p->fcoe_rx_list.lock);
1351         while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1352                 kfree_skb(skb);
1353         spin_unlock_bh(&p->fcoe_rx_list.lock);
1354 #endif
1355
1356         if (thread)
1357                 kthread_stop(thread);
1358
1359         if (crc_eof)
1360                 put_page(crc_eof);
1361 }
1362
1363 /**
1364  * fcoe_cpu_callback() - Handler for CPU hotplug events
1365  * @nfb:    The callback data block
1366  * @action: The event triggering the callback
1367  * @hcpu:   The index of the CPU that the event is for
1368  *
1369  * This creates or destroys per-CPU data for fcoe
1370  *
1371  * Returns NOTIFY_OK always.
1372  */
1373 static int fcoe_cpu_callback(struct notifier_block *nfb,
1374                              unsigned long action, void *hcpu)
1375 {
1376         unsigned cpu = (unsigned long)hcpu;
1377
1378         switch (action) {
1379         case CPU_ONLINE:
1380         case CPU_ONLINE_FROZEN:
1381                 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
1382                 fcoe_percpu_thread_create(cpu);
1383                 break;
1384         case CPU_DEAD:
1385         case CPU_DEAD_FROZEN:
1386                 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
1387                 fcoe_percpu_thread_destroy(cpu);
1388                 break;
1389         default:
1390                 break;
1391         }
1392         return NOTIFY_OK;
1393 }
1394
1395 /**
1396  * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming
1397  *                      command.
1398  *
1399  * This routine selects next CPU based on cpumask to distribute
1400  * incoming requests in round robin.
1401  *
1402  * Returns: int CPU number
1403  */
1404 static inline unsigned int fcoe_select_cpu(void)
1405 {
1406         static unsigned int selected_cpu;
1407
1408         selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
1409         if (selected_cpu >= nr_cpu_ids)
1410                 selected_cpu = cpumask_first(cpu_online_mask);
1411
1412         return selected_cpu;
1413 }
1414
1415 /**
1416  * fcoe_rcv() - Receive packets from a net device
1417  * @skb:    The received packet
1418  * @netdev: The net device that the packet was received on
1419  * @ptype:  The packet type context
1420  * @olddev: The last device net device
1421  *
1422  * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1423  * FC frame and passes the frame to libfc.
1424  *
1425  * Returns: 0 for success
1426  */
1427 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1428              struct packet_type *ptype, struct net_device *olddev)
1429 {
1430         struct fc_lport *lport;
1431         struct fcoe_rcv_info *fr;
1432         struct fcoe_ctlr *ctlr;
1433         struct fcoe_interface *fcoe;
1434         struct fc_frame_header *fh;
1435         struct fcoe_percpu_s *fps;
1436         struct ethhdr *eh;
1437         unsigned int cpu;
1438
1439         fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1440         ctlr = fcoe_to_ctlr(fcoe);
1441         lport = ctlr->lp;
1442         if (unlikely(!lport)) {
1443                 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure");
1444                 goto err2;
1445         }
1446         if (!lport->link_up)
1447                 goto err2;
1448
1449         FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p "
1450                         "data:%p tail:%p end:%p sum:%d dev:%s",
1451                         skb->len, skb->data_len, skb->head, skb->data,
1452                         skb_tail_pointer(skb), skb_end_pointer(skb),
1453                         skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1454
1455         eh = eth_hdr(skb);
1456
1457         if (is_fip_mode(ctlr) &&
1458             compare_ether_addr(eh->h_source, ctlr->dest_addr)) {
1459                 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1460                                 eh->h_source);
1461                 goto err;
1462         }
1463
1464         /*
1465          * Check for minimum frame length, and make sure required FCoE
1466          * and FC headers are pulled into the linear data area.
1467          */
1468         if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1469                      !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1470                 goto err;
1471
1472         skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1473         fh = (struct fc_frame_header *) skb_transport_header(skb);
1474
1475         if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1476                 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1477                                 eh->h_dest);
1478                 goto err;
1479         }
1480
1481         fr = fcoe_dev_from_skb(skb);
1482         fr->fr_dev = lport;
1483
1484         /*
1485          * In case the incoming frame's exchange is originated from
1486          * the initiator, then received frame's exchange id is ANDed
1487          * with fc_cpu_mask bits to get the same cpu on which exchange
1488          * was originated, otherwise select cpu using rx exchange id
1489          * or fcoe_select_cpu().
1490          */
1491         if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1492                 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1493         else {
1494                 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
1495                         cpu = fcoe_select_cpu();
1496                 else
1497                         cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
1498         }
1499
1500         if (cpu >= nr_cpu_ids)
1501                 goto err;
1502
1503         fps = &per_cpu(fcoe_percpu, cpu);
1504         spin_lock(&fps->fcoe_rx_list.lock);
1505         if (unlikely(!fps->thread)) {
1506                 /*
1507                  * The targeted CPU is not ready, let's target
1508                  * the first CPU now. For non-SMP systems this
1509                  * will check the same CPU twice.
1510                  */
1511                 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
1512                                 "ready for incoming skb- using first online "
1513                                 "CPU.\n");
1514
1515                 spin_unlock(&fps->fcoe_rx_list.lock);
1516                 cpu = cpumask_first(cpu_online_mask);
1517                 fps = &per_cpu(fcoe_percpu, cpu);
1518                 spin_lock(&fps->fcoe_rx_list.lock);
1519                 if (!fps->thread) {
1520                         spin_unlock(&fps->fcoe_rx_list.lock);
1521                         goto err;
1522                 }
1523         }
1524
1525         /*
1526          * We now have a valid CPU that we're targeting for
1527          * this skb. We also have this receive thread locked,
1528          * so we're free to queue skbs into it's queue.
1529          */
1530
1531         /*
1532          * Note: We used to have a set of conditions under which we would
1533          * call fcoe_recv_frame directly, rather than queuing to the rx list
1534          * as it could save a few cycles, but doing so is prohibited, as
1535          * fcoe_recv_frame has several paths that may sleep, which is forbidden
1536          * in softirq context.
1537          */
1538         __skb_queue_tail(&fps->fcoe_rx_list, skb);
1539         if (fps->thread->state == TASK_INTERRUPTIBLE)
1540                 wake_up_process(fps->thread);
1541         spin_unlock(&fps->fcoe_rx_list.lock);
1542
1543         return 0;
1544 err:
1545         per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++;
1546         put_cpu();
1547 err2:
1548         kfree_skb(skb);
1549         return -1;
1550 }
1551
1552 /**
1553  * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1554  * @skb:  The packet to be transmitted
1555  * @tlen: The total length of the trailer
1556  *
1557  * Returns: 0 for success
1558  */
1559 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
1560 {
1561         struct fcoe_percpu_s *fps;
1562         int rc;
1563
1564         fps = &get_cpu_var(fcoe_percpu);
1565         rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
1566         put_cpu_var(fcoe_percpu);
1567
1568         return rc;
1569 }
1570
1571 /**
1572  * fcoe_xmit() - Transmit a FCoE frame
1573  * @lport: The local port that the frame is to be transmitted for
1574  * @fp:    The frame to be transmitted
1575  *
1576  * Return: 0 for success
1577  */
1578 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1579 {
1580         int wlen;
1581         u32 crc;
1582         struct ethhdr *eh;
1583         struct fcoe_crc_eof *cp;
1584         struct sk_buff *skb;
1585         struct fc_stats *stats;
1586         struct fc_frame_header *fh;
1587         unsigned int hlen;              /* header length implies the version */
1588         unsigned int tlen;              /* trailer length */
1589         unsigned int elen;              /* eth header, may include vlan */
1590         struct fcoe_port *port = lport_priv(lport);
1591         struct fcoe_interface *fcoe = port->priv;
1592         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1593         u8 sof, eof;
1594         struct fcoe_hdr *hp;
1595
1596         WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1597
1598         fh = fc_frame_header_get(fp);
1599         skb = fp_skb(fp);
1600         wlen = skb->len / FCOE_WORD_TO_BYTE;
1601
1602         if (!lport->link_up) {
1603                 kfree_skb(skb);
1604                 return 0;
1605         }
1606
1607         if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1608             fcoe_ctlr_els_send(ctlr, lport, skb))
1609                 return 0;
1610
1611         sof = fr_sof(fp);
1612         eof = fr_eof(fp);
1613
1614         elen = sizeof(struct ethhdr);
1615         hlen = sizeof(struct fcoe_hdr);
1616         tlen = sizeof(struct fcoe_crc_eof);
1617         wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1618
1619         /* crc offload */
1620         if (likely(lport->crc_offload)) {
1621                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1622                 skb->csum_start = skb_headroom(skb);
1623                 skb->csum_offset = skb->len;
1624                 crc = 0;
1625         } else {
1626                 skb->ip_summed = CHECKSUM_NONE;
1627                 crc = fcoe_fc_crc(fp);
1628         }
1629
1630         /* copy port crc and eof to the skb buff */
1631         if (skb_is_nonlinear(skb)) {
1632                 skb_frag_t *frag;
1633                 if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
1634                         kfree_skb(skb);
1635                         return -ENOMEM;
1636                 }
1637                 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1638                 cp = kmap_atomic(skb_frag_page(frag))
1639                         + frag->page_offset;
1640         } else {
1641                 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1642         }
1643
1644         memset(cp, 0, sizeof(*cp));
1645         cp->fcoe_eof = eof;
1646         cp->fcoe_crc32 = cpu_to_le32(~crc);
1647
1648         if (skb_is_nonlinear(skb)) {
1649                 kunmap_atomic(cp);
1650                 cp = NULL;
1651         }
1652
1653         /* adjust skb network/transport offsets to match mac/fcoe/port */
1654         skb_push(skb, elen + hlen);
1655         skb_reset_mac_header(skb);
1656         skb_reset_network_header(skb);
1657         skb->mac_len = elen;
1658         skb->protocol = htons(ETH_P_FCOE);
1659         skb->priority = fcoe->priority;
1660
1661         if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN &&
1662             fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
1663                 /* must set skb->dev before calling vlan_put_tag */
1664                 skb->dev = fcoe->realdev;
1665                 skb = __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1666                                              vlan_dev_vlan_id(fcoe->netdev));
1667                 if (!skb)
1668                         return -ENOMEM;
1669         } else
1670                 skb->dev = fcoe->netdev;
1671
1672         /* fill up mac and fcoe headers */
1673         eh = eth_hdr(skb);
1674         eh->h_proto = htons(ETH_P_FCOE);
1675         memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
1676         if (ctlr->map_dest)
1677                 memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1678
1679         if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
1680                 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
1681         else
1682                 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1683
1684         hp = (struct fcoe_hdr *)(eh + 1);
1685         memset(hp, 0, sizeof(*hp));
1686         if (FC_FCOE_VER)
1687                 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1688         hp->fcoe_sof = sof;
1689
1690         /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1691         if (lport->seq_offload && fr_max_payload(fp)) {
1692                 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1693                 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1694         } else {
1695                 skb_shinfo(skb)->gso_type = 0;
1696                 skb_shinfo(skb)->gso_size = 0;
1697         }
1698         /* update tx stats: regardless if LLD fails */
1699         stats = per_cpu_ptr(lport->stats, get_cpu());
1700         stats->TxFrames++;
1701         stats->TxWords += wlen;
1702         put_cpu();
1703
1704         /* send down to lld */
1705         fr_dev(fp) = lport;
1706         fcoe_port_send(port, skb);
1707         return 0;
1708 }
1709
1710 /**
1711  * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
1712  * @skb: The completed skb (argument required by destructor)
1713  */
1714 static void fcoe_percpu_flush_done(struct sk_buff *skb)
1715 {
1716         complete(&fcoe_flush_completion);
1717 }
1718
1719 /**
1720  * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
1721  * @lport: The local port the frame was received on
1722  * @fp:    The received frame
1723  *
1724  * Return: 0 on passing filtering checks
1725  */
1726 static inline int fcoe_filter_frames(struct fc_lport *lport,
1727                                      struct fc_frame *fp)
1728 {
1729         struct fcoe_ctlr *ctlr;
1730         struct fcoe_interface *fcoe;
1731         struct fc_frame_header *fh;
1732         struct sk_buff *skb = (struct sk_buff *)fp;
1733         struct fc_stats *stats;
1734
1735         /*
1736          * We only check CRC if no offload is available and if it is
1737          * it's solicited data, in which case, the FCP layer would
1738          * check it during the copy.
1739          */
1740         if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1741                 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1742         else
1743                 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1744
1745         fh = (struct fc_frame_header *) skb_transport_header(skb);
1746         fh = fc_frame_header_get(fp);
1747         if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
1748                 return 0;
1749
1750         fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
1751         ctlr = fcoe_to_ctlr(fcoe);
1752         if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
1753             ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
1754                 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
1755                 return -EINVAL;
1756         }
1757
1758         if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
1759             le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
1760                 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1761                 return 0;
1762         }
1763
1764         stats = per_cpu_ptr(lport->stats, get_cpu());
1765         stats->InvalidCRCCount++;
1766         if (stats->InvalidCRCCount < 5)
1767                 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
1768         put_cpu();
1769         return -EINVAL;
1770 }
1771
1772 /**
1773  * fcoe_recv_frame() - process a single received frame
1774  * @skb: frame to process
1775  */
1776 static void fcoe_recv_frame(struct sk_buff *skb)
1777 {
1778         u32 fr_len;
1779         struct fc_lport *lport;
1780         struct fcoe_rcv_info *fr;
1781         struct fc_stats *stats;
1782         struct fcoe_crc_eof crc_eof;
1783         struct fc_frame *fp;
1784         struct fcoe_port *port;
1785         struct fcoe_hdr *hp;
1786
1787         fr = fcoe_dev_from_skb(skb);
1788         lport = fr->fr_dev;
1789         if (unlikely(!lport)) {
1790                 if (skb->destructor != fcoe_percpu_flush_done)
1791                         FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
1792                 kfree_skb(skb);
1793                 return;
1794         }
1795
1796         FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
1797                         "head:%p data:%p tail:%p end:%p sum:%d dev:%s",
1798                         skb->len, skb->data_len,
1799                         skb->head, skb->data, skb_tail_pointer(skb),
1800                         skb_end_pointer(skb), skb->csum,
1801                         skb->dev ? skb->dev->name : "<NULL>");
1802
1803         port = lport_priv(lport);
1804         skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
1805
1806         /*
1807          * Frame length checks and setting up the header pointers
1808          * was done in fcoe_rcv already.
1809          */
1810         hp = (struct fcoe_hdr *) skb_network_header(skb);
1811
1812         stats = per_cpu_ptr(lport->stats, get_cpu());
1813         if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1814                 if (stats->ErrorFrames < 5)
1815                         printk(KERN_WARNING "fcoe: FCoE version "
1816                                "mismatch: The frame has "
1817                                "version %x, but the "
1818                                "initiator supports version "
1819                                "%x\n", FC_FCOE_DECAPS_VER(hp),
1820                                FC_FCOE_VER);
1821                 goto drop;
1822         }
1823
1824         skb_pull(skb, sizeof(struct fcoe_hdr));
1825         fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1826
1827         stats->RxFrames++;
1828         stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1829
1830         fp = (struct fc_frame *)skb;
1831         fc_frame_init(fp);
1832         fr_dev(fp) = lport;
1833         fr_sof(fp) = hp->fcoe_sof;
1834
1835         /* Copy out the CRC and EOF trailer for access */
1836         if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1837                 goto drop;
1838         fr_eof(fp) = crc_eof.fcoe_eof;
1839         fr_crc(fp) = crc_eof.fcoe_crc32;
1840         if (pskb_trim(skb, fr_len))
1841                 goto drop;
1842
1843         if (!fcoe_filter_frames(lport, fp)) {
1844                 put_cpu();
1845                 fc_exch_recv(lport, fp);
1846                 return;
1847         }
1848 drop:
1849         stats->ErrorFrames++;
1850         put_cpu();
1851         kfree_skb(skb);
1852 }
1853
1854 /**
1855  * fcoe_percpu_receive_thread() - The per-CPU packet receive thread
1856  * @arg: The per-CPU context
1857  *
1858  * Return: 0 for success
1859  */
1860 static int fcoe_percpu_receive_thread(void *arg)
1861 {
1862         struct fcoe_percpu_s *p = arg;
1863         struct sk_buff *skb;
1864         struct sk_buff_head tmp;
1865
1866         skb_queue_head_init(&tmp);
1867
1868         set_user_nice(current, -20);
1869
1870 retry:
1871         while (!kthread_should_stop()) {
1872
1873                 spin_lock_bh(&p->fcoe_rx_list.lock);
1874                 skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
1875
1876                 if (!skb_queue_len(&tmp)) {
1877                         set_current_state(TASK_INTERRUPTIBLE);
1878                         spin_unlock_bh(&p->fcoe_rx_list.lock);
1879                         schedule();
1880                         set_current_state(TASK_RUNNING);
1881                         goto retry;
1882                 }
1883
1884                 spin_unlock_bh(&p->fcoe_rx_list.lock);
1885
1886                 while ((skb = __skb_dequeue(&tmp)) != NULL)
1887                         fcoe_recv_frame(skb);
1888
1889         }
1890         return 0;
1891 }
1892
1893 /**
1894  * fcoe_dev_setup() - Setup the link change notification interface
1895  */
1896 static void fcoe_dev_setup(void)
1897 {
1898         register_dcbevent_notifier(&dcb_notifier);
1899         register_netdevice_notifier(&fcoe_notifier);
1900 }
1901
1902 /**
1903  * fcoe_dev_cleanup() - Cleanup the link change notification interface
1904  */
1905 static void fcoe_dev_cleanup(void)
1906 {
1907         unregister_dcbevent_notifier(&dcb_notifier);
1908         unregister_netdevice_notifier(&fcoe_notifier);
1909 }
1910
1911 static struct fcoe_interface *
1912 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
1913 {
1914         struct fcoe_interface *fcoe;
1915         struct net_device *real_dev;
1916
1917         list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1918                 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
1919                         real_dev = vlan_dev_real_dev(fcoe->netdev);
1920                 else
1921                         real_dev = fcoe->netdev;
1922
1923                 if (netdev == real_dev)
1924                         return fcoe;
1925         }
1926         return NULL;
1927 }
1928
1929 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
1930                                      ulong event, void *ptr)
1931 {
1932         struct dcb_app_type *entry = ptr;
1933         struct fcoe_ctlr *ctlr;
1934         struct fcoe_interface *fcoe;
1935         struct net_device *netdev;
1936         int prio;
1937
1938         if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
1939                 return NOTIFY_OK;
1940
1941         netdev = dev_get_by_index(&init_net, entry->ifindex);
1942         if (!netdev)
1943                 return NOTIFY_OK;
1944
1945         fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
1946         dev_put(netdev);
1947         if (!fcoe)
1948                 return NOTIFY_OK;
1949
1950         ctlr = fcoe_to_ctlr(fcoe);
1951
1952         if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
1953                 prio = ffs(entry->app.priority) - 1;
1954         else
1955                 prio = entry->app.priority;
1956
1957         if (prio < 0)
1958                 return NOTIFY_OK;
1959
1960         if (entry->app.protocol == ETH_P_FIP ||
1961             entry->app.protocol == ETH_P_FCOE)
1962                 ctlr->priority = prio;
1963
1964         if (entry->app.protocol == ETH_P_FCOE)
1965                 fcoe->priority = prio;
1966
1967         return NOTIFY_OK;
1968 }
1969
1970 /**
1971  * fcoe_device_notification() - Handler for net device events
1972  * @notifier: The context of the notification
1973  * @event:    The type of event
1974  * @ptr:      The net device that the event was on
1975  *
1976  * This function is called by the Ethernet driver in case of link change event.
1977  *
1978  * Returns: 0 for success
1979  */
1980 static int fcoe_device_notification(struct notifier_block *notifier,
1981                                     ulong event, void *ptr)
1982 {
1983         struct fcoe_ctlr_device *cdev;
1984         struct fc_lport *lport = NULL;
1985         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1986         struct fcoe_ctlr *ctlr;
1987         struct fcoe_interface *fcoe;
1988         struct fcoe_port *port;
1989         struct fc_stats *stats;
1990         u32 link_possible = 1;
1991         u32 mfs;
1992         int rc = NOTIFY_OK;
1993
1994         list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1995                 if (fcoe->netdev == netdev) {
1996                         ctlr = fcoe_to_ctlr(fcoe);
1997                         lport = ctlr->lp;
1998                         break;
1999                 }
2000         }
2001         if (!lport) {
2002                 rc = NOTIFY_DONE;
2003                 goto out;
2004         }
2005
2006         switch (event) {
2007         case NETDEV_DOWN:
2008         case NETDEV_GOING_DOWN:
2009                 link_possible = 0;
2010                 break;
2011         case NETDEV_UP:
2012         case NETDEV_CHANGE:
2013                 break;
2014         case NETDEV_CHANGEMTU:
2015                 if (netdev->features & NETIF_F_FCOE_MTU)
2016                         break;
2017                 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
2018                                      sizeof(struct fcoe_crc_eof));
2019                 if (mfs >= FC_MIN_MAX_FRAME)
2020                         fc_set_mfs(lport, mfs);
2021                 break;
2022         case NETDEV_REGISTER:
2023                 break;
2024         case NETDEV_UNREGISTER:
2025                 list_del(&fcoe->list);
2026                 port = lport_priv(ctlr->lp);
2027                 queue_work(fcoe_wq, &port->destroy_work);
2028                 goto out;
2029                 break;
2030         case NETDEV_FEAT_CHANGE:
2031                 fcoe_netdev_features_change(lport, netdev);
2032                 break;
2033         default:
2034                 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
2035                                 "from netdev netlink\n", event);
2036         }
2037
2038         fcoe_link_speed_update(lport);
2039
2040         cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2041
2042         if (link_possible && !fcoe_link_ok(lport)) {
2043                 switch (cdev->enabled) {
2044                 case FCOE_CTLR_DISABLED:
2045                         pr_info("Link up while interface is disabled.\n");
2046                         break;
2047                 case FCOE_CTLR_ENABLED:
2048                 case FCOE_CTLR_UNUSED:
2049                         fcoe_ctlr_link_up(ctlr);
2050                 };
2051         } else if (fcoe_ctlr_link_down(ctlr)) {
2052                 switch (cdev->enabled) {
2053                 case FCOE_CTLR_DISABLED:
2054                         pr_info("Link down while interface is disabled.\n");
2055                         break;
2056                 case FCOE_CTLR_ENABLED:
2057                 case FCOE_CTLR_UNUSED:
2058                         stats = per_cpu_ptr(lport->stats, get_cpu());
2059                         stats->LinkFailureCount++;
2060                         put_cpu();
2061                         fcoe_clean_pending_queue(lport);
2062                 };
2063         }
2064 out:
2065         return rc;
2066 }
2067
2068 /**
2069  * fcoe_disable() - Disables a FCoE interface
2070  * @netdev  : The net_device object the Ethernet interface to create on
2071  *
2072  * Called from fcoe transport.
2073  *
2074  * Returns: 0 for success
2075  *
2076  * Deprecated: use fcoe_ctlr_enabled()
2077  */
2078 static int fcoe_disable(struct net_device *netdev)
2079 {
2080         struct fcoe_ctlr *ctlr;
2081         struct fcoe_interface *fcoe;
2082         int rc = 0;
2083
2084         mutex_lock(&fcoe_config_mutex);
2085
2086         rtnl_lock();
2087         fcoe = fcoe_hostlist_lookup_port(netdev);
2088         rtnl_unlock();
2089
2090         if (fcoe) {
2091                 ctlr = fcoe_to_ctlr(fcoe);
2092                 fcoe_ctlr_link_down(ctlr);
2093                 fcoe_clean_pending_queue(ctlr->lp);
2094         } else
2095                 rc = -ENODEV;
2096
2097         mutex_unlock(&fcoe_config_mutex);
2098         return rc;
2099 }
2100
2101 /**
2102  * fcoe_enable() - Enables a FCoE interface
2103  * @netdev  : The net_device object the Ethernet interface to create on
2104  *
2105  * Called from fcoe transport.
2106  *
2107  * Returns: 0 for success
2108  */
2109 static int fcoe_enable(struct net_device *netdev)
2110 {
2111         struct fcoe_ctlr *ctlr;
2112         struct fcoe_interface *fcoe;
2113         int rc = 0;
2114
2115         mutex_lock(&fcoe_config_mutex);
2116         rtnl_lock();
2117         fcoe = fcoe_hostlist_lookup_port(netdev);
2118         rtnl_unlock();
2119
2120         if (!fcoe) {
2121                 rc = -ENODEV;
2122                 goto out;
2123         }
2124
2125         ctlr = fcoe_to_ctlr(fcoe);
2126
2127         if (!fcoe_link_ok(ctlr->lp))
2128                 fcoe_ctlr_link_up(ctlr);
2129
2130 out:
2131         mutex_unlock(&fcoe_config_mutex);
2132         return rc;
2133 }
2134
2135 /**
2136  * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
2137  * @cdev: The FCoE Controller that is being enabled or disabled
2138  *
2139  * fcoe_sysfs will ensure that the state of 'enabled' has
2140  * changed, so no checking is necessary here. This routine simply
2141  * calls fcoe_enable or fcoe_disable, both of which are deprecated.
2142  * When those routines are removed the functionality can be merged
2143  * here.
2144  */
2145 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
2146 {
2147         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
2148         struct fc_lport *lport = ctlr->lp;
2149         struct net_device *netdev = fcoe_netdev(lport);
2150
2151         switch (cdev->enabled) {
2152         case FCOE_CTLR_ENABLED:
2153                 return fcoe_enable(netdev);
2154         case FCOE_CTLR_DISABLED:
2155                 return fcoe_disable(netdev);
2156         case FCOE_CTLR_UNUSED:
2157         default:
2158                 return -ENOTSUPP;
2159         };
2160 }
2161
2162 /**
2163  * fcoe_destroy() - Destroy a FCoE interface
2164  * @netdev  : The net_device object the Ethernet interface to create on
2165  *
2166  * Called from fcoe transport
2167  *
2168  * Returns: 0 for success
2169  */
2170 static int fcoe_destroy(struct net_device *netdev)
2171 {
2172         struct fcoe_ctlr *ctlr;
2173         struct fcoe_interface *fcoe;
2174         struct fc_lport *lport;
2175         struct fcoe_port *port;
2176         int rc = 0;
2177
2178         mutex_lock(&fcoe_config_mutex);
2179         rtnl_lock();
2180         fcoe = fcoe_hostlist_lookup_port(netdev);
2181         if (!fcoe) {
2182                 rc = -ENODEV;
2183                 goto out_nodev;
2184         }
2185         ctlr = fcoe_to_ctlr(fcoe);
2186         lport = ctlr->lp;
2187         port = lport_priv(lport);
2188         list_del(&fcoe->list);
2189         queue_work(fcoe_wq, &port->destroy_work);
2190 out_nodev:
2191         rtnl_unlock();
2192         mutex_unlock(&fcoe_config_mutex);
2193         return rc;
2194 }
2195
2196 /**
2197  * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2198  * @work: Handle to the FCoE port to be destroyed
2199  */
2200 static void fcoe_destroy_work(struct work_struct *work)
2201 {
2202         struct fcoe_ctlr_device *cdev;
2203         struct fcoe_ctlr *ctlr;
2204         struct fcoe_port *port;
2205         struct fcoe_interface *fcoe;
2206         struct Scsi_Host *shost;
2207         struct fc_host_attrs *fc_host;
2208         unsigned long flags;
2209         struct fc_vport *vport;
2210         struct fc_vport *next_vport;
2211
2212         port = container_of(work, struct fcoe_port, destroy_work);
2213         shost = port->lport->host;
2214         fc_host = shost_to_fc_host(shost);
2215
2216         /* Loop through all the vports and mark them for deletion */
2217         spin_lock_irqsave(shost->host_lock, flags);
2218         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2219                 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
2220                         continue;
2221                 } else {
2222                         vport->flags |= FC_VPORT_DELETING;
2223                         queue_work(fc_host_work_q(shost),
2224                                    &vport->vport_delete_work);
2225                 }
2226         }
2227         spin_unlock_irqrestore(shost->host_lock, flags);
2228
2229         flush_workqueue(fc_host_work_q(shost));
2230
2231         mutex_lock(&fcoe_config_mutex);
2232
2233         fcoe = port->priv;
2234         ctlr = fcoe_to_ctlr(fcoe);
2235         cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2236
2237         fcoe_if_destroy(port->lport);
2238         fcoe_interface_cleanup(fcoe);
2239
2240         mutex_unlock(&fcoe_config_mutex);
2241
2242         fcoe_ctlr_device_delete(cdev);
2243 }
2244
2245 /**
2246  * fcoe_match() - Check if the FCoE is supported on the given netdevice
2247  * @netdev  : The net_device object the Ethernet interface to create on
2248  *
2249  * Called from fcoe transport.
2250  *
2251  * Returns: always returns true as this is the default FCoE transport,
2252  * i.e., support all netdevs.
2253  */
2254 static bool fcoe_match(struct net_device *netdev)
2255 {
2256         return true;
2257 }
2258
2259 /**
2260  * fcoe_dcb_create() - Initialize DCB attributes and hooks
2261  * @netdev: The net_device object of the L2 link that should be queried
2262  * @port: The fcoe_port to bind FCoE APP priority with
2263  * @
2264  */
2265 static void fcoe_dcb_create(struct fcoe_interface *fcoe)
2266 {
2267 #ifdef CONFIG_DCB
2268         int dcbx;
2269         u8 fup, up;
2270         struct net_device *netdev = fcoe->realdev;
2271         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2272         struct dcb_app app = {
2273                                 .priority = 0,
2274                                 .protocol = ETH_P_FCOE
2275                              };
2276
2277         /* setup DCB priority attributes. */
2278         if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
2279                 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
2280
2281                 if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
2282                         app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
2283                         up = dcb_ieee_getapp_mask(netdev, &app);
2284                         app.protocol = ETH_P_FIP;
2285                         fup = dcb_ieee_getapp_mask(netdev, &app);
2286                 } else {
2287                         app.selector = DCB_APP_IDTYPE_ETHTYPE;
2288                         up = dcb_getapp(netdev, &app);
2289                         app.protocol = ETH_P_FIP;
2290                         fup = dcb_getapp(netdev, &app);
2291                 }
2292
2293                 fcoe->priority = ffs(up) ? ffs(up) - 1 : 0;
2294                 ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority;
2295         }
2296 #endif
2297 }
2298
2299 enum fcoe_create_link_state {
2300         FCOE_CREATE_LINK_DOWN,
2301         FCOE_CREATE_LINK_UP,
2302 };
2303
2304 /**
2305  * _fcoe_create() - (internal) Create a fcoe interface
2306  * @netdev  :   The net_device object the Ethernet interface to create on
2307  * @fip_mode:   The FIP mode for this creation
2308  * @link_state: The ctlr link state on creation
2309  *
2310  * Called from either the libfcoe 'create' module parameter
2311  * via fcoe_create or from fcoe_syfs's ctlr_create file.
2312  *
2313  * libfcoe's 'create' module parameter is deprecated so some
2314  * consolidation of code can be done when that interface is
2315  * removed.
2316  */
2317 static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode,
2318                         enum fcoe_create_link_state link_state)
2319 {
2320         int rc = 0;
2321         struct fcoe_ctlr_device *ctlr_dev;
2322         struct fcoe_ctlr *ctlr;
2323         struct fcoe_interface *fcoe;
2324         struct fc_lport *lport;
2325
2326         mutex_lock(&fcoe_config_mutex);
2327         rtnl_lock();
2328
2329         /* look for existing lport */
2330         if (fcoe_hostlist_lookup(netdev)) {
2331                 rc = -EEXIST;
2332                 goto out_nodev;
2333         }
2334
2335         fcoe = fcoe_interface_create(netdev, fip_mode);
2336         if (IS_ERR(fcoe)) {
2337                 rc = PTR_ERR(fcoe);
2338                 goto out_nodev;
2339         }
2340
2341         ctlr = fcoe_to_ctlr(fcoe);
2342         ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
2343         lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
2344         if (IS_ERR(lport)) {
2345                 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2346                        netdev->name);
2347                 rc = -EIO;
2348                 rtnl_unlock();
2349                 fcoe_interface_cleanup(fcoe);
2350                 mutex_unlock(&fcoe_config_mutex);
2351                 fcoe_ctlr_device_delete(ctlr_dev);
2352                 goto out;
2353         }
2354
2355         /* Make this the "master" N_Port */
2356         ctlr->lp = lport;
2357
2358         /* setup DCB priority attributes. */
2359         fcoe_dcb_create(fcoe);
2360
2361         /* start FIP Discovery and FLOGI */
2362         lport->boot_time = jiffies;
2363         fc_fabric_login(lport);
2364
2365         /*
2366          * If the fcoe_ctlr_device is to be set to DISABLED
2367          * it must be done after the lport is added to the
2368          * hostlist, but before the rtnl_lock is released.
2369          * This is because the rtnl_lock protects the
2370          * hostlist that fcoe_device_notification uses. If
2371          * the FCoE Controller is intended to be created
2372          * DISABLED then 'enabled' needs to be considered
2373          * handling link events. 'enabled' must be set
2374          * before the lport can be found in the hostlist
2375          * when a link up event is received.
2376          */
2377         if (link_state == FCOE_CREATE_LINK_UP)
2378                 ctlr_dev->enabled = FCOE_CTLR_ENABLED;
2379         else
2380                 ctlr_dev->enabled = FCOE_CTLR_DISABLED;
2381
2382         if (link_state == FCOE_CREATE_LINK_UP &&
2383             !fcoe_link_ok(lport)) {
2384                 rtnl_unlock();
2385                 fcoe_ctlr_link_up(ctlr);
2386                 mutex_unlock(&fcoe_config_mutex);
2387                 return rc;
2388         }
2389
2390 out_nodev:
2391         rtnl_unlock();
2392         mutex_unlock(&fcoe_config_mutex);
2393 out:
2394         return rc;
2395 }
2396
2397 /**
2398  * fcoe_create() - Create a fcoe interface
2399  * @netdev  : The net_device object the Ethernet interface to create on
2400  * @fip_mode: The FIP mode for this creation
2401  *
2402  * Called from fcoe transport
2403  *
2404  * Returns: 0 for success
2405  */
2406 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
2407 {
2408         return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
2409 }
2410
2411 /**
2412  * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
2413  * @netdev: The net_device to be used by the allocated FCoE Controller
2414  *
2415  * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
2416  * in a link_down state. The allows the user an opportunity to configure
2417  * the FCoE Controller from sysfs before enabling the FCoE Controller.
2418  *
2419  * Creating in with this routine starts the FCoE Controller in Fabric
2420  * mode. The user can change to VN2VN or another mode before enabling.
2421  */
2422 static int fcoe_ctlr_alloc(struct net_device *netdev)
2423 {
2424         return _fcoe_create(netdev, FIP_MODE_FABRIC,
2425                             FCOE_CREATE_LINK_DOWN);
2426 }
2427
2428 /**
2429  * fcoe_link_ok() - Check if the link is OK for a local port
2430  * @lport: The local port to check link on
2431  *
2432  * Returns: 0 if link is UP and OK, -1 if not
2433  *
2434  */
2435 static int fcoe_link_ok(struct fc_lport *lport)
2436 {
2437         struct net_device *netdev = fcoe_netdev(lport);
2438
2439         if (netif_oper_up(netdev))
2440                 return 0;
2441         return -1;
2442 }
2443
2444 /**
2445  * fcoe_percpu_clean() - Clear all pending skbs for an local port
2446  * @lport: The local port whose skbs are to be cleared
2447  *
2448  * Must be called with fcoe_create_mutex held to single-thread completion.
2449  *
2450  * This flushes the pending skbs by adding a new skb to each queue and
2451  * waiting until they are all freed.  This assures us that not only are
2452  * there no packets that will be handled by the lport, but also that any
2453  * threads already handling packet have returned.
2454  */
2455 static void fcoe_percpu_clean(struct fc_lport *lport)
2456 {
2457         struct fcoe_percpu_s *pp;
2458         struct sk_buff *skb;
2459         unsigned int cpu;
2460
2461         for_each_possible_cpu(cpu) {
2462                 pp = &per_cpu(fcoe_percpu, cpu);
2463
2464                 if (!pp->thread || !cpu_online(cpu))
2465                         continue;
2466
2467                 skb = dev_alloc_skb(0);
2468                 if (!skb)
2469                         continue;
2470
2471                 skb->destructor = fcoe_percpu_flush_done;
2472
2473                 spin_lock_bh(&pp->fcoe_rx_list.lock);
2474                 __skb_queue_tail(&pp->fcoe_rx_list, skb);
2475                 if (pp->fcoe_rx_list.qlen == 1)
2476                         wake_up_process(pp->thread);
2477                 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2478
2479                 wait_for_completion(&fcoe_flush_completion);
2480         }
2481 }
2482
2483 /**
2484  * fcoe_reset() - Reset a local port
2485  * @shost: The SCSI host associated with the local port to be reset
2486  *
2487  * Returns: Always 0 (return value required by FC transport template)
2488  */
2489 static int fcoe_reset(struct Scsi_Host *shost)
2490 {
2491         struct fc_lport *lport = shost_priv(shost);
2492         struct fcoe_port *port = lport_priv(lport);
2493         struct fcoe_interface *fcoe = port->priv;
2494         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2495         struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2496
2497         fcoe_ctlr_link_down(ctlr);
2498         fcoe_clean_pending_queue(ctlr->lp);
2499
2500         if (cdev->enabled != FCOE_CTLR_DISABLED &&
2501             !fcoe_link_ok(ctlr->lp))
2502                 fcoe_ctlr_link_up(ctlr);
2503         return 0;
2504 }
2505
2506 /**
2507  * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2508  * @netdev: The net device used as a key
2509  *
2510  * Locking: Must be called with the RNL mutex held.
2511  *
2512  * Returns: NULL or the FCoE interface
2513  */
2514 static struct fcoe_interface *
2515 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2516 {
2517         struct fcoe_interface *fcoe;
2518
2519         list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2520                 if (fcoe->netdev == netdev)
2521                         return fcoe;
2522         }
2523         return NULL;
2524 }
2525
2526 /**
2527  * fcoe_hostlist_lookup() - Find the local port associated with a
2528  *                          given net device
2529  * @netdev: The netdevice used as a key
2530  *
2531  * Locking: Must be called with the RTNL mutex held
2532  *
2533  * Returns: NULL or the local port
2534  */
2535 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2536 {
2537         struct fcoe_ctlr *ctlr;
2538         struct fcoe_interface *fcoe;
2539
2540         fcoe = fcoe_hostlist_lookup_port(netdev);
2541         ctlr = fcoe_to_ctlr(fcoe);
2542         return (fcoe) ? ctlr->lp : NULL;
2543 }
2544
2545 /**
2546  * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2547  *                       port to the hostlist
2548  * @lport: The local port that identifies the FCoE interface to be added
2549  *
2550  * Locking: must be called with the RTNL mutex held
2551  *
2552  * Returns: 0 for success
2553  */
2554 static int fcoe_hostlist_add(const struct fc_lport *lport)
2555 {
2556         struct fcoe_interface *fcoe;
2557         struct fcoe_port *port;
2558
2559         fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2560         if (!fcoe) {
2561                 port = lport_priv(lport);
2562                 fcoe = port->priv;
2563                 list_add_tail(&fcoe->list, &fcoe_hostlist);
2564         }
2565         return 0;
2566 }
2567
2568 /**
2569  * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
2570  *                       port to the hostlist
2571  * @lport: The local port that identifies the FCoE interface to be added
2572  *
2573  * Locking: must be called with the RTNL mutex held
2574  *
2575  */
2576 static void fcoe_hostlist_del(const struct fc_lport *lport)
2577 {
2578         struct fcoe_interface *fcoe;
2579         struct fcoe_port *port;
2580
2581         port = lport_priv(lport);
2582         fcoe = port->priv;
2583         list_del(&fcoe->list);
2584         return;
2585 }
2586
2587 static struct fcoe_transport fcoe_sw_transport = {
2588         .name = {FCOE_TRANSPORT_DEFAULT},
2589         .attached = false,
2590         .list = LIST_HEAD_INIT(fcoe_sw_transport.list),
2591         .match = fcoe_match,
2592         .alloc = fcoe_ctlr_alloc,
2593         .create = fcoe_create,
2594         .destroy = fcoe_destroy,
2595         .enable = fcoe_enable,
2596         .disable = fcoe_disable,
2597 };
2598
2599 /**
2600  * fcoe_init() - Initialize fcoe.ko
2601  *
2602  * Returns: 0 on success, or a negative value on failure
2603  */
2604 static int __init fcoe_init(void)
2605 {
2606         struct fcoe_percpu_s *p;
2607         unsigned int cpu;
2608         int rc = 0;
2609
2610         fcoe_wq = alloc_workqueue("fcoe", 0, 0);
2611         if (!fcoe_wq)
2612                 return -ENOMEM;
2613
2614         /* register as a fcoe transport */
2615         rc = fcoe_transport_attach(&fcoe_sw_transport);
2616         if (rc) {
2617                 printk(KERN_ERR "failed to register an fcoe transport, check "
2618                         "if libfcoe is loaded\n");
2619                 return rc;
2620         }
2621
2622         mutex_lock(&fcoe_config_mutex);
2623
2624         for_each_possible_cpu(cpu) {
2625                 p = &per_cpu(fcoe_percpu, cpu);
2626                 skb_queue_head_init(&p->fcoe_rx_list);
2627         }
2628
2629         for_each_online_cpu(cpu)
2630                 fcoe_percpu_thread_create(cpu);
2631
2632         /* Initialize per CPU interrupt thread */
2633         rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
2634         if (rc)
2635                 goto out_free;
2636
2637         /* Setup link change notification */
2638         fcoe_dev_setup();
2639
2640         rc = fcoe_if_init();
2641         if (rc)
2642                 goto out_free;
2643
2644         mutex_unlock(&fcoe_config_mutex);
2645         return 0;
2646
2647 out_free:
2648         for_each_online_cpu(cpu) {
2649                 fcoe_percpu_thread_destroy(cpu);
2650         }
2651         mutex_unlock(&fcoe_config_mutex);
2652         destroy_workqueue(fcoe_wq);
2653         return rc;
2654 }
2655 module_init(fcoe_init);
2656
2657 /**
2658  * fcoe_exit() - Clean up fcoe.ko
2659  *
2660  * Returns: 0 on success or a  negative value on failure
2661  */
2662 static void __exit fcoe_exit(void)
2663 {
2664         struct fcoe_interface *fcoe, *tmp;
2665         struct fcoe_ctlr *ctlr;
2666         struct fcoe_port *port;
2667         unsigned int cpu;
2668
2669         mutex_lock(&fcoe_config_mutex);
2670
2671         fcoe_dev_cleanup();
2672
2673         /* releases the associated fcoe hosts */
2674         rtnl_lock();
2675         list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2676                 ctlr = fcoe_to_ctlr(fcoe);
2677                 port = lport_priv(ctlr->lp);
2678                 fcoe_hostlist_del(port->lport);
2679                 queue_work(fcoe_wq, &port->destroy_work);
2680         }
2681         rtnl_unlock();
2682
2683         unregister_hotcpu_notifier(&fcoe_cpu_notifier);
2684
2685         for_each_online_cpu(cpu)
2686                 fcoe_percpu_thread_destroy(cpu);
2687
2688         mutex_unlock(&fcoe_config_mutex);
2689
2690         /*
2691          * destroy_work's may be chained but destroy_workqueue()
2692          * can take care of them. Just kill the fcoe_wq.
2693          */
2694         destroy_workqueue(fcoe_wq);
2695
2696         /*
2697          * Detaching from the scsi transport must happen after all
2698          * destroys are done on the fcoe_wq. destroy_workqueue will
2699          * enusre the fcoe_wq is flushed.
2700          */
2701         fcoe_if_exit();
2702
2703         /* detach from fcoe transport */
2704         fcoe_transport_detach(&fcoe_sw_transport);
2705 }
2706 module_exit(fcoe_exit);
2707
2708 /**
2709  * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2710  * @seq: active sequence in the FLOGI or FDISC exchange
2711  * @fp: response frame, or error encoded in a pointer (timeout)
2712  * @arg: pointer the the fcoe_ctlr structure
2713  *
2714  * This handles MAC address management for FCoE, then passes control on to
2715  * the libfc FLOGI response handler.
2716  */
2717 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2718 {
2719         struct fcoe_ctlr *fip = arg;
2720         struct fc_exch *exch = fc_seq_exch(seq);
2721         struct fc_lport *lport = exch->lp;
2722         u8 *mac;
2723
2724         if (IS_ERR(fp))
2725                 goto done;
2726
2727         mac = fr_cb(fp)->granted_mac;
2728         /* pre-FIP */
2729         if (is_zero_ether_addr(mac))
2730                 fcoe_ctlr_recv_flogi(fip, lport, fp);
2731         if (!is_zero_ether_addr(mac))
2732                 fcoe_update_src_mac(lport, mac);
2733 done:
2734         fc_lport_flogi_resp(seq, fp, lport);
2735 }
2736
2737 /**
2738  * fcoe_logo_resp() - FCoE specific LOGO response handler
2739  * @seq: active sequence in the LOGO exchange
2740  * @fp: response frame, or error encoded in a pointer (timeout)
2741  * @arg: pointer the the fcoe_ctlr structure
2742  *
2743  * This handles MAC address management for FCoE, then passes control on to
2744  * the libfc LOGO response handler.
2745  */
2746 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2747 {
2748         struct fc_lport *lport = arg;
2749         static u8 zero_mac[ETH_ALEN] = { 0 };
2750
2751         if (!IS_ERR(fp))
2752                 fcoe_update_src_mac(lport, zero_mac);
2753         fc_lport_logo_resp(seq, fp, lport);
2754 }
2755
2756 /**
2757  * fcoe_elsct_send - FCoE specific ELS handler
2758  *
2759  * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2760  * using FCoE specific response handlers and passing the FIP controller as
2761  * the argument (the lport is still available from the exchange).
2762  *
2763  * Most of the work here is just handed off to the libfc routine.
2764  */
2765 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2766                                       struct fc_frame *fp, unsigned int op,
2767                                       void (*resp)(struct fc_seq *,
2768                                                    struct fc_frame *,
2769                                                    void *),
2770                                       void *arg, u32 timeout)
2771 {
2772         struct fcoe_port *port = lport_priv(lport);
2773         struct fcoe_interface *fcoe = port->priv;
2774         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
2775         struct fc_frame_header *fh = fc_frame_header_get(fp);
2776
2777         switch (op) {
2778         case ELS_FLOGI:
2779         case ELS_FDISC:
2780                 if (lport->point_to_multipoint)
2781                         break;
2782                 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2783                                      fip, timeout);
2784         case ELS_LOGO:
2785                 /* only hook onto fabric logouts, not port logouts */
2786                 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2787                         break;
2788                 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2789                                      lport, timeout);
2790         }
2791         return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2792 }
2793
2794 /**
2795  * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2796  * @vport: fc_vport object to create a new fc_host for
2797  * @disabled: start the new fc_host in a disabled state by default?
2798  *
2799  * Returns: 0 for success
2800  */
2801 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2802 {
2803         struct Scsi_Host *shost = vport_to_shost(vport);
2804         struct fc_lport *n_port = shost_priv(shost);
2805         struct fcoe_port *port = lport_priv(n_port);
2806         struct fcoe_interface *fcoe = port->priv;
2807         struct net_device *netdev = fcoe->netdev;
2808         struct fc_lport *vn_port;
2809         int rc;
2810         char buf[32];
2811
2812         rc = fcoe_validate_vport_create(vport);
2813         if (rc) {
2814                 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
2815                 printk(KERN_ERR "fcoe: Failed to create vport, "
2816                         "WWPN (0x%s) already exists\n",
2817                         buf);
2818                 return rc;
2819         }
2820
2821         mutex_lock(&fcoe_config_mutex);
2822         rtnl_lock();
2823         vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2824         rtnl_unlock();
2825         mutex_unlock(&fcoe_config_mutex);
2826
2827         if (IS_ERR(vn_port)) {
2828                 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2829                        netdev->name);
2830                 return -EIO;
2831         }
2832
2833         if (disabled) {
2834                 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2835         } else {
2836                 vn_port->boot_time = jiffies;
2837                 fc_fabric_login(vn_port);
2838                 fc_vport_setlink(vn_port);
2839         }
2840         return 0;
2841 }
2842
2843 /**
2844  * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2845  * @vport: fc_vport object that is being destroyed
2846  *
2847  * Returns: 0 for success
2848  */
2849 static int fcoe_vport_destroy(struct fc_vport *vport)
2850 {
2851         struct Scsi_Host *shost = vport_to_shost(vport);
2852         struct fc_lport *n_port = shost_priv(shost);
2853         struct fc_lport *vn_port = vport->dd_data;
2854
2855         mutex_lock(&n_port->lp_mutex);
2856         list_del(&vn_port->list);
2857         mutex_unlock(&n_port->lp_mutex);
2858
2859         mutex_lock(&fcoe_config_mutex);
2860         fcoe_if_destroy(vn_port);
2861         mutex_unlock(&fcoe_config_mutex);
2862
2863         return 0;
2864 }
2865
2866 /**
2867  * fcoe_vport_disable() - change vport state
2868  * @vport: vport to bring online/offline
2869  * @disable: should the vport be disabled?
2870  */
2871 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2872 {
2873         struct fc_lport *lport = vport->dd_data;
2874
2875         if (disable) {
2876                 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2877                 fc_fabric_logoff(lport);
2878         } else {
2879                 lport->boot_time = jiffies;
2880                 fc_fabric_login(lport);
2881                 fc_vport_setlink(lport);
2882         }
2883
2884         return 0;
2885 }
2886
2887 /**
2888  * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
2889  * @vport: fc_vport with a new symbolic name string
2890  *
2891  * After generating a new symbolic name string, a new RSPN_ID request is
2892  * sent to the name server.  There is no response handler, so if it fails
2893  * for some reason it will not be retried.
2894  */
2895 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2896 {
2897         struct fc_lport *lport = vport->dd_data;
2898         struct fc_frame *fp;
2899         size_t len;
2900
2901         snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2902                  "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2903                  fcoe_netdev(lport)->name, vport->symbolic_name);
2904
2905         if (lport->state != LPORT_ST_READY)
2906                 return;
2907
2908         len = strnlen(fc_host_symbolic_name(lport->host), 255);
2909         fp = fc_frame_alloc(lport,
2910                             sizeof(struct fc_ct_hdr) +
2911                             sizeof(struct fc_ns_rspn) + len);
2912         if (!fp)
2913                 return;
2914         lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2915                              NULL, NULL, 3 * lport->r_a_tov);
2916 }
2917
2918 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
2919 {
2920         struct fcoe_ctlr_device *ctlr_dev =
2921                 fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2922         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2923         struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2924
2925         fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
2926 }
2927
2928 /**
2929  * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2930  * @lport: the local port
2931  * @port_id: the port ID
2932  * @fp: the received frame, if any, that caused the port_id to be set.
2933  *
2934  * This routine handles the case where we received a FLOGI and are
2935  * entering point-to-point mode.  We need to call fcoe_ctlr_recv_flogi()
2936  * so it can set the non-mapped mode and gateway address.
2937  *
2938  * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2939  */
2940 static void fcoe_set_port_id(struct fc_lport *lport,
2941                              u32 port_id, struct fc_frame *fp)
2942 {
2943         struct fcoe_port *port = lport_priv(lport);
2944         struct fcoe_interface *fcoe = port->priv;
2945         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2946
2947         if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2948                 fcoe_ctlr_recv_flogi(ctlr, lport, fp);
2949 }