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 = scsi_change_queue_depth,
 284         .this_id = -1,
 285         .cmd_per_lun = 3,
 286         .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
 287         .use_clustering = ENABLE_CLUSTERING,
 288         .sg_tablesize = SG_ALL,
 289         .max_sectors = 0xffff,
 290         .track_queue_depth = 1,
 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 = 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         ctlr->cdev = ctlr_dev;
 412         fcoe = fcoe_ctlr_priv(ctlr);
 413
 414         dev_hold(netdev);
 415
 416         /*
 417          * Initialize FIP.
 418          */
 419         fcoe_ctlr_init(ctlr, fip_mode);
 420         ctlr->send = fcoe_fip_send;
 421         ctlr->update_mac = fcoe_update_src_mac;
 422         ctlr->get_src_addr = fcoe_get_src_mac;
 423
 424         err = fcoe_interface_setup(fcoe, netdev);
 425         if (err) {
 426                 fcoe_ctlr_destroy(ctlr);
 427                 fcoe_ctlr_device_delete(ctlr_dev);
 428                 dev_put(netdev);
 429                 fcoe = ERR_PTR(err);
 430                 goto out_putmod;
 431         }
 432
 433         goto out;
 434
 435 out_putmod:
 436         module_put(THIS_MODULE);
 437 out:
 438         return fcoe;
 439 }
 440
 441 /**
 442  * fcoe_interface_remove() - remove FCoE interface from netdev
 443  * @fcoe: The FCoE interface to be cleaned up
 444  *
 445  * Caller must be holding the RTNL mutex
 446  */
 447 static void fcoe_interface_remove(struct fcoe_interface *fcoe)
 448 {
 449         struct net_device *netdev = fcoe->netdev;
 450         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
 451         u8 flogi_maddr[ETH_ALEN];
 452         const struct net_device_ops *ops;
 453
 454         /*
 455          * Don't listen for Ethernet packets anymore.
 456          * synchronize_net() ensures that the packet handlers are not running
 457          * on another CPU. dev_remove_pack() would do that, this calls the
 458          * unsyncronized version __dev_remove_pack() to avoid multiple delays.
 459          */
 460         __dev_remove_pack(&fcoe->fcoe_packet_type);
 461         __dev_remove_pack(&fcoe->fip_packet_type);
 462         synchronize_net();
 463
 464         /* Delete secondary MAC addresses */
 465         memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
 466         dev_uc_del(netdev, flogi_maddr);
 467         if (fip->spma)
 468                 dev_uc_del(netdev, fip->ctl_src_addr);
 469         if (fip->mode == FIP_MODE_VN2VN) {
 470                 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
 471                 dev_mc_del(netdev, FIP_ALL_P2P_MACS);
 472         } else
 473                 dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
 474
 475         /* Tell the LLD we are done w/ FCoE */
 476         ops = netdev->netdev_ops;
 477         if (ops->ndo_fcoe_disable) {
 478                 if (ops->ndo_fcoe_disable(netdev))
 479                         FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
 480                                         " specific feature for LLD.\n");
 481         }
 482         fcoe->removed = 1;
 483 }
 484
 485
 486 /**
 487  * fcoe_interface_cleanup() - Clean up a FCoE interface
 488  * @fcoe: The FCoE interface to be cleaned up
 489  */
 490 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
 491 {
 492         struct net_device *netdev = fcoe->netdev;
 493         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
 494
 495         rtnl_lock();
 496         if (!fcoe->removed)
 497                 fcoe_interface_remove(fcoe);
 498         rtnl_unlock();
 499
 500         /* Release the self-reference taken during fcoe_interface_create() */
 501         /* tear-down the FCoE controller */
 502         fcoe_ctlr_destroy(fip);
 503         scsi_host_put(fip->lp->host);
 504         dev_put(netdev);
 505         module_put(THIS_MODULE);
 506 }
 507
 508 /**
 509  * fcoe_fip_recv() - Handler for received FIP frames
 510  * @skb:      The receive skb
 511  * @netdev:   The associated net device
 512  * @ptype:    The packet_type structure which was used to register this handler
 513  * @orig_dev: The original net_device the the skb was received on.
 514  *            (in case dev is a bond)
 515  *
 516  * Returns: 0 for success
 517  */
 518 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
 519                          struct packet_type *ptype,
 520                          struct net_device *orig_dev)
 521 {
 522         struct fcoe_interface *fcoe;
 523         struct fcoe_ctlr *ctlr;
 524
 525         fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
 526         ctlr = fcoe_to_ctlr(fcoe);
 527         fcoe_ctlr_recv(ctlr, skb);
 528         return 0;
 529 }
 530
 531 /**
 532  * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
 533  * @port: The FCoE port
 534  * @skb: The FIP/FCoE packet to be sent
 535  */
 536 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
 537 {
 538         if (port->fcoe_pending_queue.qlen)
 539                 fcoe_check_wait_queue(port->lport, skb);
 540         else if (fcoe_start_io(skb))
 541                 fcoe_check_wait_queue(port->lport, skb);
 542 }
 543
 544 /**
 545  * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
 546  * @fip: The FCoE controller
 547  * @skb: The FIP packet to be sent
 548  */
 549 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
 550 {
 551         skb->dev = fcoe_from_ctlr(fip)->netdev;
 552         fcoe_port_send(lport_priv(fip->lp), skb);
 553 }
 554
 555 /**
 556  * fcoe_update_src_mac() - Update the Ethernet MAC filters
 557  * @lport: The local port to update the source MAC on
 558  * @addr:  Unicast MAC address to add
 559  *
 560  * Remove any previously-set unicast MAC filter.
 561  * Add secondary FCoE MAC address filter for our OUI.
 562  */
 563 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
 564 {
 565         struct fcoe_port *port = lport_priv(lport);
 566         struct fcoe_interface *fcoe = port->priv;
 567
 568         if (!is_zero_ether_addr(port->data_src_addr))
 569                 dev_uc_del(fcoe->netdev, port->data_src_addr);
 570         if (!is_zero_ether_addr(addr))
 571                 dev_uc_add(fcoe->netdev, addr);
 572         memcpy(port->data_src_addr, addr, ETH_ALEN);
 573 }
 574
 575 /**
 576  * fcoe_get_src_mac() - return the Ethernet source address for an lport
 577  * @lport: libfc lport
 578  */
 579 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
 580 {
 581         struct fcoe_port *port = lport_priv(lport);
 582
 583         return port->data_src_addr;
 584 }
 585
 586 /**
 587  * fcoe_lport_config() - Set up a local port
 588  * @lport: The local port to be setup
 589  *
 590  * Returns: 0 for success
 591  */
 592 static int fcoe_lport_config(struct fc_lport *lport)
 593 {
 594         lport->link_up = 0;
 595         lport->qfull = 0;
 596         lport->max_retry_count = 3;
 597         lport->max_rport_retry_count = 3;
 598         lport->e_d_tov = 2 * 1000;      /* FC-FS default */
 599         lport->r_a_tov = 2 * 2 * 1000;
 600         lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
 601                                  FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
 602         lport->does_npiv = 1;
 603
 604         fc_lport_init_stats(lport);
 605
 606         /* lport fc_lport related configuration */
 607         fc_lport_config(lport);
 608
 609         /* offload related configuration */
 610         lport->crc_offload = 0;
 611         lport->seq_offload = 0;
 612         lport->lro_enabled = 0;
 613         lport->lro_xid = 0;
 614         lport->lso_max = 0;
 615
 616         return 0;
 617 }
 618
 619 /**
 620  * fcoe_netdev_features_change - Updates the lport's offload flags based
 621  * on the LLD netdev's FCoE feature flags
 622  */
 623 static void fcoe_netdev_features_change(struct fc_lport *lport,
 624                                         struct net_device *netdev)
 625 {
 626         mutex_lock(&lport->lp_mutex);
 627
 628         if (netdev->features & NETIF_F_SG)
 629                 lport->sg_supp = 1;
 630         else
 631                 lport->sg_supp = 0;
 632
 633         if (netdev->features & NETIF_F_FCOE_CRC) {
 634                 lport->crc_offload = 1;
 635                 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
 636         } else {
 637                 lport->crc_offload = 0;
 638         }
 639
 640         if (netdev->features & NETIF_F_FSO) {
 641                 lport->seq_offload = 1;
 642                 lport->lso_max = netdev->gso_max_size;
 643                 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
 644                                 lport->lso_max);
 645         } else {
 646                 lport->seq_offload = 0;
 647                 lport->lso_max = 0;
 648         }
 649
 650         if (netdev->fcoe_ddp_xid) {
 651                 lport->lro_enabled = 1;
 652                 lport->lro_xid = netdev->fcoe_ddp_xid;
 653                 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
 654                                 lport->lro_xid);
 655         } else {
 656                 lport->lro_enabled = 0;
 657                 lport->lro_xid = 0;
 658         }
 659
 660         mutex_unlock(&lport->lp_mutex);
 661 }
 662
 663 /**
 664  * fcoe_netdev_config() - Set up net devive for SW FCoE
 665  * @lport:  The local port that is associated with the net device
 666  * @netdev: The associated net device
 667  *
 668  * Must be called after fcoe_lport_config() as it will use local port mutex
 669  *
 670  * Returns: 0 for success
 671  */
 672 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
 673 {
 674         u32 mfs;
 675         u64 wwnn, wwpn;
 676         struct fcoe_interface *fcoe;
 677         struct fcoe_ctlr *ctlr;
 678         struct fcoe_port *port;
 679
 680         /* Setup lport private data to point to fcoe softc */
 681         port = lport_priv(lport);
 682         fcoe = port->priv;
 683         ctlr = fcoe_to_ctlr(fcoe);
 684
 685         /*
 686          * Determine max frame size based on underlying device and optional
 687          * user-configured limit.  If the MFS is too low, fcoe_link_ok()
 688          * will return 0, so do this first.
 689          */
 690         mfs = netdev->mtu;
 691         if (netdev->features & NETIF_F_FCOE_MTU) {
 692                 mfs = FCOE_MTU;
 693                 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
 694         }
 695         mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
 696         if (fc_set_mfs(lport, mfs))
 697                 return -EINVAL;
 698
 699         /* offload features support */
 700         fcoe_netdev_features_change(lport, netdev);
 701
 702         skb_queue_head_init(&port->fcoe_pending_queue);
 703         port->fcoe_pending_queue_active = 0;
 704         setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
 705
 706         fcoe_link_speed_update(lport);
 707
 708         if (!lport->vport) {
 709                 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
 710                         wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
 711                 fc_set_wwnn(lport, wwnn);
 712                 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
 713                         wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
 714                                                  2, 0);
 715                 fc_set_wwpn(lport, wwpn);
 716         }
 717
 718         return 0;
 719 }
 720
 721 /**
 722  * fcoe_shost_config() - Set up the SCSI host associated with a local port
 723  * @lport: The local port
 724  * @dev:   The device associated with the SCSI host
 725  *
 726  * Must be called after fcoe_lport_config() and fcoe_netdev_config()
 727  *
 728  * Returns: 0 for success
 729  */
 730 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
 731 {
 732         int rc = 0;
 733
 734         /* lport scsi host config */
 735         lport->host->max_lun = FCOE_MAX_LUN;
 736         lport->host->max_id = FCOE_MAX_FCP_TARGET;
 737         lport->host->max_channel = 0;
 738         lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
 739
 740         if (lport->vport)
 741                 lport->host->transportt = fcoe_vport_scsi_transport;
 742         else
 743                 lport->host->transportt = fcoe_nport_scsi_transport;
 744
 745         /* add the new host to the SCSI-ml */
 746         rc = scsi_add_host(lport->host, dev);
 747         if (rc) {
 748                 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
 749                                 "error on scsi_add_host\n");
 750                 return rc;
 751         }
 752
 753         if (!lport->vport)
 754                 fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
 755
 756         snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
 757                  "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
 758                  fcoe_netdev(lport)->name);
 759
 760         return 0;
 761 }
 762
 763
 764 /**
 765  * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE
 766  * @lport:  The local port that is associated with the net device
 767  * @netdev: The associated net device
 768  *
 769  * Must be called after fcoe_shost_config() as it will use local port mutex
 770  *
 771  */
 772 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
 773 {
 774         struct fcoe_interface *fcoe;
 775         struct fcoe_port *port;
 776         struct net_device *realdev;
 777         int rc;
 778
 779         port = lport_priv(lport);
 780         fcoe = port->priv;
 781         realdev = fcoe->realdev;
 782
 783         if (!realdev)
 784                 return;
 785
 786         /* No FDMI state m/c for NPIV ports */
 787         if (lport->vport)
 788                 return;
 789
 790         if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
 791                 struct netdev_fcoe_hbainfo *fdmi;
 792                 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL);
 793                 if (!fdmi)
 794                         return;
 795
 796                 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
 797                                                                fdmi);
 798                 if (rc) {
 799                         printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
 800                                         "information from netdev.\n");
 801                         return;
 802                 }
 803
 804                 snprintf(fc_host_serial_number(lport->host),
 805                          FC_SERIAL_NUMBER_SIZE,
 806                          "%s",
 807                          fdmi->serial_number);
 808                 snprintf(fc_host_manufacturer(lport->host),
 809                          FC_SERIAL_NUMBER_SIZE,
 810                          "%s",
 811                          fdmi->manufacturer);
 812                 snprintf(fc_host_model(lport->host),
 813                          FC_SYMBOLIC_NAME_SIZE,
 814                          "%s",
 815                          fdmi->model);
 816                 snprintf(fc_host_model_description(lport->host),
 817                          FC_SYMBOLIC_NAME_SIZE,
 818                          "%s",
 819                          fdmi->model_description);
 820                 snprintf(fc_host_hardware_version(lport->host),
 821                          FC_VERSION_STRING_SIZE,
 822                          "%s",
 823                          fdmi->hardware_version);
 824                 snprintf(fc_host_driver_version(lport->host),
 825                          FC_VERSION_STRING_SIZE,
 826                          "%s",
 827                          fdmi->driver_version);
 828                 snprintf(fc_host_optionrom_version(lport->host),
 829                          FC_VERSION_STRING_SIZE,
 830                          "%s",
 831                          fdmi->optionrom_version);
 832                 snprintf(fc_host_firmware_version(lport->host),
 833                          FC_VERSION_STRING_SIZE,
 834                          "%s",
 835                          fdmi->firmware_version);
 836
 837                 /* Enable FDMI lport states */
 838                 lport->fdmi_enabled = 1;
 839                 kfree(fdmi);
 840         } else {
 841                 lport->fdmi_enabled = 0;
 842                 printk(KERN_INFO "fcoe: No FDMI support.\n");
 843         }
 844 }
 845
 846 /**
 847  * fcoe_oem_match() - The match routine for the offloaded exchange manager
 848  * @fp: The I/O frame
 849  *
 850  * This routine will be associated with an exchange manager (EM). When
 851  * the libfc exchange handling code is looking for an EM to use it will
 852  * call this routine and pass it the frame that it wishes to send. This
 853  * routine will return True if the associated EM is to be used and False
 854  * if the echange code should continue looking for an EM.
 855  *
 856  * The offload EM that this routine is associated with will handle any
 857  * packets that are for SCSI read requests.
 858  *
 859  * This has been enhanced to work when FCoE stack is operating in target
 860  * mode.
 861  *
 862  * Returns: True for read types I/O, otherwise returns false.
 863  */
 864 static bool fcoe_oem_match(struct fc_frame *fp)
 865 {
 866         struct fc_frame_header *fh = fc_frame_header_get(fp);
 867         struct fcp_cmnd *fcp;
 868
 869         if (fc_fcp_is_read(fr_fsp(fp)) &&
 870             (fr_fsp(fp)->data_len > fcoe_ddp_min))
 871                 return true;
 872         else if ((fr_fsp(fp) == NULL) &&
 873                  (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
 874                  (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
 875                 fcp = fc_frame_payload_get(fp, sizeof(*fcp));
 876                 if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
 877                     (ntohl(fcp->fc_dl) > fcoe_ddp_min))
 878                         return true;
 879         }
 880         return false;
 881 }
 882
 883 /**
 884  * fcoe_em_config() - Allocate and configure an exchange manager
 885  * @lport: The local port that the new EM will be associated with
 886  *
 887  * Returns: 0 on success
 888  */
 889 static inline int fcoe_em_config(struct fc_lport *lport)
 890 {
 891         struct fcoe_port *port = lport_priv(lport);
 892         struct fcoe_interface *fcoe = port->priv;
 893         struct fcoe_interface *oldfcoe = NULL;
 894         struct net_device *old_real_dev, *cur_real_dev;
 895         u16 min_xid = FCOE_MIN_XID;
 896         u16 max_xid = FCOE_MAX_XID;
 897
 898         /*
 899          * Check if need to allocate an em instance for
 900          * offload exchange ids to be shared across all VN_PORTs/lport.
 901          */
 902         if (!lport->lro_enabled || !lport->lro_xid ||
 903             (lport->lro_xid >= max_xid)) {
 904                 lport->lro_xid = 0;
 905                 goto skip_oem;
 906         }
 907
 908         /*
 909          * Reuse existing offload em instance in case
 910          * it is already allocated on real eth device
 911          */
 912         if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
 913                 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
 914         else
 915                 cur_real_dev = fcoe->netdev;
 916
 917         list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
 918                 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
 919                         old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
 920                 else
 921                         old_real_dev = oldfcoe->netdev;
 922
 923                 if (cur_real_dev == old_real_dev) {
 924                         fcoe->oem = oldfcoe->oem;
 925                         break;
 926                 }
 927         }
 928
 929         if (fcoe->oem) {
 930                 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
 931                         printk(KERN_ERR "fcoe_em_config: failed to add "
 932                                "offload em:%p on interface:%s\n",
 933                                fcoe->oem, fcoe->netdev->name);
 934                         return -ENOMEM;
 935                 }
 936         } else {
 937                 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
 938                                               FCOE_MIN_XID, lport->lro_xid,
 939                                               fcoe_oem_match);
 940                 if (!fcoe->oem) {
 941                         printk(KERN_ERR "fcoe_em_config: failed to allocate "
 942                                "em for offload exches on interface:%s\n",
 943                                fcoe->netdev->name);
 944                         return -ENOMEM;
 945                 }
 946         }
 947
 948         /*
 949          * Exclude offload EM xid range from next EM xid range.
 950          */
 951         min_xid += lport->lro_xid + 1;
 952
 953 skip_oem:
 954         if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
 955                 printk(KERN_ERR "fcoe_em_config: failed to "
 956                        "allocate em on interface %s\n", fcoe->netdev->name);
 957                 return -ENOMEM;
 958         }
 959
 960         return 0;
 961 }
 962
 963 /**
 964  * fcoe_if_destroy() - Tear down a SW FCoE instance
 965  * @lport: The local port to be destroyed
 966  *
 967  */
 968 static void fcoe_if_destroy(struct fc_lport *lport)
 969 {
 970         struct fcoe_port *port = lport_priv(lport);
 971         struct fcoe_interface *fcoe = port->priv;
 972         struct net_device *netdev = fcoe->netdev;
 973
 974         FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
 975
 976         /* Logout of the fabric */
 977         fc_fabric_logoff(lport);
 978
 979         /* Cleanup the fc_lport */
 980         fc_lport_destroy(lport);
 981
 982         /* Stop the transmit retry timer */
 983         del_timer_sync(&port->timer);
 984
 985         /* Free existing transmit skbs */
 986         fcoe_clean_pending_queue(lport);
 987
 988         rtnl_lock();
 989         if (!is_zero_ether_addr(port->data_src_addr))
 990                 dev_uc_del(netdev, port->data_src_addr);
 991         if (lport->vport)
 992                 synchronize_net();
 993         else
 994                 fcoe_interface_remove(fcoe);
 995         rtnl_unlock();
 996
 997         /* Free queued packets for the per-CPU receive threads */
 998         fcoe_percpu_clean(lport);
 999
1000         /* Detach from the scsi-ml */
1001         fc_remove_host(lport->host);
1002         scsi_remove_host(lport->host);
1003
1004         /* Destroy lport scsi_priv */
1005         fc_fcp_destroy(lport);
1006
1007         /* There are no more rports or I/O, free the EM */
1008         fc_exch_mgr_free(lport);
1009
1010         /* Free memory used by statistical counters */
1011         fc_lport_free_stats(lport);
1012
1013         /*
1014          * Release the Scsi_Host for vport but hold on to
1015          * master lport until it fcoe interface fully cleaned-up.
1016          */
1017         if (lport->vport)
1018                 scsi_host_put(lport->host);
1019 }
1020
1021 /**
1022  * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
1023  * @lport: The local port to setup DDP for
1024  * @xid:   The exchange ID for this DDP transfer
1025  * @sgl:   The scatterlist describing this transfer
1026  * @sgc:   The number of sg items
1027  *
1028  * Returns: 0 if the DDP context was not configured
1029  */
1030 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
1031                           struct scatterlist *sgl, unsigned int sgc)
1032 {
1033         struct net_device *netdev = fcoe_netdev(lport);
1034
1035         if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
1036                 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
1037                                                               xid, sgl,
1038                                                               sgc);
1039
1040         return 0;
1041 }
1042
1043 /**
1044  * fcoe_ddp_target() - Call a LLD's ddp_target through the net device
1045  * @lport: The local port to setup DDP for
1046  * @xid:   The exchange ID for this DDP transfer
1047  * @sgl:   The scatterlist describing this transfer
1048  * @sgc:   The number of sg items
1049  *
1050  * Returns: 0 if the DDP context was not configured
1051  */
1052 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid,
1053                            struct scatterlist *sgl, unsigned int sgc)
1054 {
1055         struct net_device *netdev = fcoe_netdev(lport);
1056
1057         if (netdev->netdev_ops->ndo_fcoe_ddp_target)
1058                 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
1059                                                                sgl, sgc);
1060
1061         return 0;
1062 }
1063
1064
1065 /**
1066  * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
1067  * @lport: The local port to complete DDP on
1068  * @xid:   The exchange ID for this DDP transfer
1069  *
1070  * Returns: the length of data that have been completed by DDP
1071  */
1072 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
1073 {
1074         struct net_device *netdev = fcoe_netdev(lport);
1075
1076         if (netdev->netdev_ops->ndo_fcoe_ddp_done)
1077                 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
1078         return 0;
1079 }
1080
1081 /**
1082  * fcoe_if_create() - Create a FCoE instance on an interface
1083  * @fcoe:   The FCoE interface to create a local port on
1084  * @parent: The device pointer to be the parent in sysfs for the SCSI host
1085  * @npiv:   Indicates if the port is a vport or not
1086  *
1087  * Creates a fc_lport instance and a Scsi_Host instance and configure them.
1088  *
1089  * Returns: The allocated fc_lport or an error pointer
1090  */
1091 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
1092                                        struct device *parent, int npiv)
1093 {
1094         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1095         struct net_device *netdev = fcoe->netdev;
1096         struct fc_lport *lport, *n_port;
1097         struct fcoe_port *port;
1098         struct Scsi_Host *shost;
1099         int rc;
1100         /*
1101          * parent is only a vport if npiv is 1,
1102          * but we'll only use vport in that case so go ahead and set it
1103          */
1104         struct fc_vport *vport = dev_to_vport(parent);
1105
1106         FCOE_NETDEV_DBG(netdev, "Create Interface\n");
1107
1108         if (!npiv)
1109                 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port));
1110         else
1111                 lport = libfc_vport_create(vport, sizeof(*port));
1112
1113         if (!lport) {
1114                 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
1115                 rc = -ENOMEM;
1116                 goto out;
1117         }
1118         port = lport_priv(lport);
1119         port->lport = lport;
1120         port->priv = fcoe;
1121         port->get_netdev = fcoe_netdev;
1122         port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
1123         port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
1124         INIT_WORK(&port->destroy_work, fcoe_destroy_work);
1125
1126         /*
1127          * Need to add the lport to the hostlist
1128          * so we catch NETDEV_CHANGE events.
1129          */
1130         fcoe_hostlist_add(lport);
1131
1132         /* configure a fc_lport including the exchange manager */
1133         rc = fcoe_lport_config(lport);
1134         if (rc) {
1135                 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
1136                                 "interface\n");
1137                 goto out_host_put;
1138         }
1139
1140         if (npiv) {
1141                 FCOE_NETDEV_DBG(netdev, "Setting vport names, "
1142                                 "%16.16llx %16.16llx\n",
1143                                 vport->node_name, vport->port_name);
1144                 fc_set_wwnn(lport, vport->node_name);
1145                 fc_set_wwpn(lport, vport->port_name);
1146         }
1147
1148         /* configure lport network properties */
1149         rc = fcoe_netdev_config(lport, netdev);
1150         if (rc) {
1151                 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
1152                                 "interface\n");
1153                 goto out_lp_destroy;
1154         }
1155
1156         /* configure lport scsi host properties */
1157         rc = fcoe_shost_config(lport, parent);
1158         if (rc) {
1159                 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
1160                                 "interface\n");
1161                 goto out_lp_destroy;
1162         }
1163
1164         /* Initialize the library */
1165         rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1);
1166         if (rc) {
1167                 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
1168                                 "interface\n");
1169                 goto out_lp_destroy;
1170         }
1171
1172         /* Initialized FDMI information */
1173         fcoe_fdmi_info(lport, netdev);
1174
1175         /*
1176          * fcoe_em_alloc() and fcoe_hostlist_add() both
1177          * need to be atomic with respect to other changes to the
1178          * hostlist since fcoe_em_alloc() looks for an existing EM
1179          * instance on host list updated by fcoe_hostlist_add().
1180          *
1181          * This is currently handled through the fcoe_config_mutex
1182          * begin held.
1183          */
1184         if (!npiv)
1185                 /* lport exch manager allocation */
1186                 rc = fcoe_em_config(lport);
1187         else {
1188                 shost = vport_to_shost(vport);
1189                 n_port = shost_priv(shost);
1190                 rc = fc_exch_mgr_list_clone(n_port, lport);
1191         }
1192
1193         if (rc) {
1194                 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
1195                 goto out_lp_destroy;
1196         }
1197
1198         return lport;
1199
1200 out_lp_destroy:
1201         fc_exch_mgr_free(lport);
1202 out_host_put:
1203         fcoe_hostlist_del(lport);
1204         scsi_host_put(lport->host);
1205 out:
1206         return ERR_PTR(rc);
1207 }
1208
1209 /**
1210  * fcoe_if_init() - Initialization routine for fcoe.ko
1211  *
1212  * Attaches the SW FCoE transport to the FC transport
1213  *
1214  * Returns: 0 on success
1215  */
1216 static int __init fcoe_if_init(void)
1217 {
1218         /* attach to scsi transport */
1219         fcoe_nport_scsi_transport =
1220                 fc_attach_transport(&fcoe_nport_fc_functions);
1221         fcoe_vport_scsi_transport =
1222                 fc_attach_transport(&fcoe_vport_fc_functions);
1223
1224         if (!fcoe_nport_scsi_transport) {
1225                 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1226                 return -ENODEV;
1227         }
1228
1229         return 0;
1230 }
1231
1232 /**
1233  * fcoe_if_exit() - Tear down fcoe.ko
1234  *
1235  * Detaches the SW FCoE transport from the FC transport
1236  *
1237  * Returns: 0 on success
1238  */
1239 static int __exit fcoe_if_exit(void)
1240 {
1241         fc_release_transport(fcoe_nport_scsi_transport);
1242         fc_release_transport(fcoe_vport_scsi_transport);
1243         fcoe_nport_scsi_transport = NULL;
1244         fcoe_vport_scsi_transport = NULL;
1245         return 0;
1246 }
1247
1248 /**
1249  * fcoe_percpu_thread_create() - Create a receive thread for an online CPU
1250  * @cpu: The CPU index of the CPU to create a receive thread for
1251  */
1252 static void fcoe_percpu_thread_create(unsigned int cpu)
1253 {
1254         struct fcoe_percpu_s *p;
1255         struct task_struct *thread;
1256
1257         p = &per_cpu(fcoe_percpu, cpu);
1258
1259         thread = kthread_create_on_node(fcoe_percpu_receive_thread,
1260                                         (void *)p, cpu_to_node(cpu),
1261                                         "fcoethread/%d", cpu);
1262
1263         if (likely(!IS_ERR(thread))) {
1264                 kthread_bind(thread, cpu);
1265                 wake_up_process(thread);
1266
1267                 spin_lock_bh(&p->fcoe_rx_list.lock);
1268                 p->thread = thread;
1269                 spin_unlock_bh(&p->fcoe_rx_list.lock);
1270         }
1271 }
1272
1273 /**
1274  * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
1275  * @cpu: The CPU index of the CPU whose receive thread is to be destroyed
1276  *
1277  * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
1278  * current CPU's Rx thread. If the thread being destroyed is bound to
1279  * the CPU processing this context the skbs will be freed.
1280  */
1281 static void fcoe_percpu_thread_destroy(unsigned int cpu)
1282 {
1283         struct fcoe_percpu_s *p;
1284         struct task_struct *thread;
1285         struct page *crc_eof;
1286         struct sk_buff *skb;
1287 #ifdef CONFIG_SMP
1288         struct fcoe_percpu_s *p0;
1289         unsigned targ_cpu = get_cpu();
1290 #endif /* CONFIG_SMP */
1291
1292         FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
1293
1294         /* Prevent any new skbs from being queued for this CPU. */
1295         p = &per_cpu(fcoe_percpu, cpu);
1296         spin_lock_bh(&p->fcoe_rx_list.lock);
1297         thread = p->thread;
1298         p->thread = NULL;
1299         crc_eof = p->crc_eof_page;
1300         p->crc_eof_page = NULL;
1301         p->crc_eof_offset = 0;
1302         spin_unlock_bh(&p->fcoe_rx_list.lock);
1303
1304 #ifdef CONFIG_SMP
1305         /*
1306          * Don't bother moving the skb's if this context is running
1307          * on the same CPU that is having its thread destroyed. This
1308          * can easily happen when the module is removed.
1309          */
1310         if (cpu != targ_cpu) {
1311                 p0 = &per_cpu(fcoe_percpu, targ_cpu);
1312                 spin_lock_bh(&p0->fcoe_rx_list.lock);
1313                 if (p0->thread) {
1314                         FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
1315                                  cpu, targ_cpu);
1316
1317                         while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1318                                 __skb_queue_tail(&p0->fcoe_rx_list, skb);
1319                         spin_unlock_bh(&p0->fcoe_rx_list.lock);
1320                 } else {
1321                         /*
1322                          * The targeted CPU is not initialized and cannot accept
1323                          * new  skbs. Unlock the targeted CPU and drop the skbs
1324                          * on the CPU that is going offline.
1325                          */
1326                         while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1327                                 kfree_skb(skb);
1328                         spin_unlock_bh(&p0->fcoe_rx_list.lock);
1329                 }
1330         } else {
1331                 /*
1332                  * This scenario occurs when the module is being removed
1333                  * and all threads are being destroyed. skbs will continue
1334                  * to be shifted from the CPU thread that is being removed
1335                  * to the CPU thread associated with the CPU that is processing
1336                  * the module removal. Once there is only one CPU Rx thread it
1337                  * will reach this case and we will drop all skbs and later
1338                  * stop the thread.
1339                  */
1340                 spin_lock_bh(&p->fcoe_rx_list.lock);
1341                 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1342                         kfree_skb(skb);
1343                 spin_unlock_bh(&p->fcoe_rx_list.lock);
1344         }
1345         put_cpu();
1346 #else
1347         /*
1348          * This a non-SMP scenario where the singular Rx thread is
1349          * being removed. Free all skbs and stop the thread.
1350          */
1351         spin_lock_bh(&p->fcoe_rx_list.lock);
1352         while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1353                 kfree_skb(skb);
1354         spin_unlock_bh(&p->fcoe_rx_list.lock);
1355 #endif
1356
1357         if (thread)
1358                 kthread_stop(thread);
1359
1360         if (crc_eof)
1361                 put_page(crc_eof);
1362 }
1363
1364 /**
1365  * fcoe_cpu_callback() - Handler for CPU hotplug events
1366  * @nfb:    The callback data block
1367  * @action: The event triggering the callback
1368  * @hcpu:   The index of the CPU that the event is for
1369  *
1370  * This creates or destroys per-CPU data for fcoe
1371  *
1372  * Returns NOTIFY_OK always.
1373  */
1374 static int fcoe_cpu_callback(struct notifier_block *nfb,
1375                              unsigned long action, void *hcpu)
1376 {
1377         unsigned cpu = (unsigned long)hcpu;
1378
1379         switch (action) {
1380         case CPU_ONLINE:
1381         case CPU_ONLINE_FROZEN:
1382                 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
1383                 fcoe_percpu_thread_create(cpu);
1384                 break;
1385         case CPU_DEAD:
1386         case CPU_DEAD_FROZEN:
1387                 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
1388                 fcoe_percpu_thread_destroy(cpu);
1389                 break;
1390         default:
1391                 break;
1392         }
1393         return NOTIFY_OK;
1394 }
1395
1396 /**
1397  * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming
1398  *                      command.
1399  *
1400  * This routine selects next CPU based on cpumask to distribute
1401  * incoming requests in round robin.
1402  *
1403  * Returns: int CPU number
1404  */
1405 static inline unsigned int fcoe_select_cpu(void)
1406 {
1407         static unsigned int selected_cpu;
1408
1409         selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
1410         if (selected_cpu >= nr_cpu_ids)
1411                 selected_cpu = cpumask_first(cpu_online_mask);
1412
1413         return selected_cpu;
1414 }
1415
1416 /**
1417  * fcoe_rcv() - Receive packets from a net device
1418  * @skb:    The received packet
1419  * @netdev: The net device that the packet was received on
1420  * @ptype:  The packet type context
1421  * @olddev: The last device net device
1422  *
1423  * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1424  * FC frame and passes the frame to libfc.
1425  *
1426  * Returns: 0 for success
1427  */
1428 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1429              struct packet_type *ptype, struct net_device *olddev)
1430 {
1431         struct fc_lport *lport;
1432         struct fcoe_rcv_info *fr;
1433         struct fcoe_ctlr *ctlr;
1434         struct fcoe_interface *fcoe;
1435         struct fc_frame_header *fh;
1436         struct fcoe_percpu_s *fps;
1437         struct ethhdr *eh;
1438         unsigned int cpu;
1439
1440         fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1441         ctlr = fcoe_to_ctlr(fcoe);
1442         lport = ctlr->lp;
1443         if (unlikely(!lport)) {
1444                 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n");
1445                 goto err2;
1446         }
1447         if (!lport->link_up)
1448                 goto err2;
1449
1450         FCOE_NETDEV_DBG(netdev,
1451                         "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1452                         skb->len, skb->data_len, skb->head, skb->data,
1453                         skb_tail_pointer(skb), skb_end_pointer(skb),
1454                         skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1455
1456
1457         skb = skb_share_check(skb, GFP_ATOMIC);
1458
1459         if (skb == NULL)
1460                 return NET_RX_DROP;
1461
1462         eh = eth_hdr(skb);
1463
1464         if (is_fip_mode(ctlr) &&
1465             !ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
1466                 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1467                                 eh->h_source);
1468                 goto err;
1469         }
1470
1471         /*
1472          * Check for minimum frame length, and make sure required FCoE
1473          * and FC headers are pulled into the linear data area.
1474          */
1475         if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1476                      !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1477                 goto err;
1478
1479         skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1480         fh = (struct fc_frame_header *) skb_transport_header(skb);
1481
1482         if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1483                 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1484                                 eh->h_dest);
1485                 goto err;
1486         }
1487
1488         fr = fcoe_dev_from_skb(skb);
1489         fr->fr_dev = lport;
1490
1491         /*
1492          * In case the incoming frame's exchange is originated from
1493          * the initiator, then received frame's exchange id is ANDed
1494          * with fc_cpu_mask bits to get the same cpu on which exchange
1495          * was originated, otherwise select cpu using rx exchange id
1496          * or fcoe_select_cpu().
1497          */
1498         if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1499                 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1500         else {
1501                 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
1502                         cpu = fcoe_select_cpu();
1503                 else
1504                         cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
1505         }
1506
1507         if (cpu >= nr_cpu_ids)
1508                 goto err;
1509
1510         fps = &per_cpu(fcoe_percpu, cpu);
1511         spin_lock(&fps->fcoe_rx_list.lock);
1512         if (unlikely(!fps->thread)) {
1513                 /*
1514                  * The targeted CPU is not ready, let's target
1515                  * the first CPU now. For non-SMP systems this
1516                  * will check the same CPU twice.
1517                  */
1518                 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
1519                                 "ready for incoming skb- using first online "
1520                                 "CPU.\n");
1521
1522                 spin_unlock(&fps->fcoe_rx_list.lock);
1523                 cpu = cpumask_first(cpu_online_mask);
1524                 fps = &per_cpu(fcoe_percpu, cpu);
1525                 spin_lock(&fps->fcoe_rx_list.lock);
1526                 if (!fps->thread) {
1527                         spin_unlock(&fps->fcoe_rx_list.lock);
1528                         goto err;
1529                 }
1530         }
1531
1532         /*
1533          * We now have a valid CPU that we're targeting for
1534          * this skb. We also have this receive thread locked,
1535          * so we're free to queue skbs into it's queue.
1536          */
1537
1538         /*
1539          * Note: We used to have a set of conditions under which we would
1540          * call fcoe_recv_frame directly, rather than queuing to the rx list
1541          * as it could save a few cycles, but doing so is prohibited, as
1542          * fcoe_recv_frame has several paths that may sleep, which is forbidden
1543          * in softirq context.
1544          */
1545         __skb_queue_tail(&fps->fcoe_rx_list, skb);
1546         if (fps->thread->state == TASK_INTERRUPTIBLE)
1547                 wake_up_process(fps->thread);
1548         spin_unlock(&fps->fcoe_rx_list.lock);
1549
1550         return NET_RX_SUCCESS;
1551 err:
1552         per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++;
1553         put_cpu();
1554 err2:
1555         kfree_skb(skb);
1556         return NET_RX_DROP;
1557 }
1558
1559 /**
1560  * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1561  * @skb:  The packet to be transmitted
1562  * @tlen: The total length of the trailer
1563  *
1564  * Returns: 0 for success
1565  */
1566 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
1567 {
1568         struct fcoe_percpu_s *fps;
1569         int rc;
1570
1571         fps = &get_cpu_var(fcoe_percpu);
1572         rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
1573         put_cpu_var(fcoe_percpu);
1574
1575         return rc;
1576 }
1577
1578 /**
1579  * fcoe_xmit() - Transmit a FCoE frame
1580  * @lport: The local port that the frame is to be transmitted for
1581  * @fp:    The frame to be transmitted
1582  *
1583  * Return: 0 for success
1584  */
1585 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1586 {
1587         int wlen;
1588         u32 crc;
1589         struct ethhdr *eh;
1590         struct fcoe_crc_eof *cp;
1591         struct sk_buff *skb;
1592         struct fc_stats *stats;
1593         struct fc_frame_header *fh;
1594         unsigned int hlen;              /* header length implies the version */
1595         unsigned int tlen;              /* trailer length */
1596         unsigned int elen;              /* eth header, may include vlan */
1597         struct fcoe_port *port = lport_priv(lport);
1598         struct fcoe_interface *fcoe = port->priv;
1599         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1600         u8 sof, eof;
1601         struct fcoe_hdr *hp;
1602
1603         WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1604
1605         fh = fc_frame_header_get(fp);
1606         skb = fp_skb(fp);
1607         wlen = skb->len / FCOE_WORD_TO_BYTE;
1608
1609         if (!lport->link_up) {
1610                 kfree_skb(skb);
1611                 return 0;
1612         }
1613
1614         if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1615             fcoe_ctlr_els_send(ctlr, lport, skb))
1616                 return 0;
1617
1618         sof = fr_sof(fp);
1619         eof = fr_eof(fp);
1620
1621         elen = sizeof(struct ethhdr);
1622         hlen = sizeof(struct fcoe_hdr);
1623         tlen = sizeof(struct fcoe_crc_eof);
1624         wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1625
1626         /* crc offload */
1627         if (likely(lport->crc_offload)) {
1628                 skb->ip_summed = CHECKSUM_PARTIAL;
1629                 skb->csum_start = skb_headroom(skb);
1630                 skb->csum_offset = skb->len;
1631                 crc = 0;
1632         } else {
1633                 skb->ip_summed = CHECKSUM_NONE;
1634                 crc = fcoe_fc_crc(fp);
1635         }
1636
1637         /* copy port crc and eof to the skb buff */
1638         if (skb_is_nonlinear(skb)) {
1639                 skb_frag_t *frag;
1640                 if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
1641                         kfree_skb(skb);
1642                         return -ENOMEM;
1643                 }
1644                 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1645                 cp = kmap_atomic(skb_frag_page(frag))
1646                         + frag->page_offset;
1647         } else {
1648                 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1649         }
1650
1651         memset(cp, 0, sizeof(*cp));
1652         cp->fcoe_eof = eof;
1653         cp->fcoe_crc32 = cpu_to_le32(~crc);
1654
1655         if (skb_is_nonlinear(skb)) {
1656                 kunmap_atomic(cp);
1657                 cp = NULL;
1658         }
1659
1660         /* adjust skb network/transport offsets to match mac/fcoe/port */
1661         skb_push(skb, elen + hlen);
1662         skb_reset_mac_header(skb);
1663         skb_reset_network_header(skb);
1664         skb->mac_len = elen;
1665         skb->protocol = htons(ETH_P_FCOE);
1666         skb->priority = fcoe->priority;
1667
1668         if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN &&
1669             fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
1670                 /* must set skb->dev before calling vlan_put_tag */
1671                 skb->dev = fcoe->realdev;
1672                 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1673                                        vlan_dev_vlan_id(fcoe->netdev));
1674         } else
1675                 skb->dev = fcoe->netdev;
1676
1677         /* fill up mac and fcoe headers */
1678         eh = eth_hdr(skb);
1679         eh->h_proto = htons(ETH_P_FCOE);
1680         memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
1681         if (ctlr->map_dest)
1682                 memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1683
1684         if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
1685                 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
1686         else
1687                 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1688
1689         hp = (struct fcoe_hdr *)(eh + 1);
1690         memset(hp, 0, sizeof(*hp));
1691         if (FC_FCOE_VER)
1692                 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1693         hp->fcoe_sof = sof;
1694
1695         /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1696         if (lport->seq_offload && fr_max_payload(fp)) {
1697                 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1698                 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1699         } else {
1700                 skb_shinfo(skb)->gso_type = 0;
1701                 skb_shinfo(skb)->gso_size = 0;
1702         }
1703         /* update tx stats: regardless if LLD fails */
1704         stats = per_cpu_ptr(lport->stats, get_cpu());
1705         stats->TxFrames++;
1706         stats->TxWords += wlen;
1707         put_cpu();
1708
1709         /* send down to lld */
1710         fr_dev(fp) = lport;
1711         fcoe_port_send(port, skb);
1712         return 0;
1713 }
1714
1715 /**
1716  * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
1717  * @skb: The completed skb (argument required by destructor)
1718  */
1719 static void fcoe_percpu_flush_done(struct sk_buff *skb)
1720 {
1721         complete(&fcoe_flush_completion);
1722 }
1723
1724 /**
1725  * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
1726  * @lport: The local port the frame was received on
1727  * @fp:    The received frame
1728  *
1729  * Return: 0 on passing filtering checks
1730  */
1731 static inline int fcoe_filter_frames(struct fc_lport *lport,
1732                                      struct fc_frame *fp)
1733 {
1734         struct fcoe_ctlr *ctlr;
1735         struct fcoe_interface *fcoe;
1736         struct fc_frame_header *fh;
1737         struct sk_buff *skb = (struct sk_buff *)fp;
1738         struct fc_stats *stats;
1739
1740         /*
1741          * We only check CRC if no offload is available and if it is
1742          * it's solicited data, in which case, the FCP layer would
1743          * check it during the copy.
1744          */
1745         if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1746                 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1747         else
1748                 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1749
1750         fh = (struct fc_frame_header *) skb_transport_header(skb);
1751         fh = fc_frame_header_get(fp);
1752         if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
1753                 return 0;
1754
1755         fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
1756         ctlr = fcoe_to_ctlr(fcoe);
1757         if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
1758             ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
1759                 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
1760                 return -EINVAL;
1761         }
1762
1763         if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
1764             le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
1765                 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1766                 return 0;
1767         }
1768
1769         stats = per_cpu_ptr(lport->stats, get_cpu());
1770         stats->InvalidCRCCount++;
1771         if (stats->InvalidCRCCount < 5)
1772                 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
1773         put_cpu();
1774         return -EINVAL;
1775 }
1776
1777 /**
1778  * fcoe_recv_frame() - process a single received frame
1779  * @skb: frame to process
1780  */
1781 static void fcoe_recv_frame(struct sk_buff *skb)
1782 {
1783         u32 fr_len;
1784         struct fc_lport *lport;
1785         struct fcoe_rcv_info *fr;
1786         struct fc_stats *stats;
1787         struct fcoe_crc_eof crc_eof;
1788         struct fc_frame *fp;
1789         struct fcoe_port *port;
1790         struct fcoe_hdr *hp;
1791
1792         fr = fcoe_dev_from_skb(skb);
1793         lport = fr->fr_dev;
1794         if (unlikely(!lport)) {
1795                 if (skb->destructor != fcoe_percpu_flush_done)
1796                         FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
1797                 kfree_skb(skb);
1798                 return;
1799         }
1800
1801         FCOE_NETDEV_DBG(skb->dev,
1802                         "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1803                         skb->len, skb->data_len,
1804                         skb->head, skb->data, skb_tail_pointer(skb),
1805                         skb_end_pointer(skb), skb->csum,
1806                         skb->dev ? skb->dev->name : "<NULL>");
1807
1808         port = lport_priv(lport);
1809         skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
1810
1811         /*
1812          * Frame length checks and setting up the header pointers
1813          * was done in fcoe_rcv already.
1814          */
1815         hp = (struct fcoe_hdr *) skb_network_header(skb);
1816
1817         stats = per_cpu_ptr(lport->stats, get_cpu());
1818         if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1819                 if (stats->ErrorFrames < 5)
1820                         printk(KERN_WARNING "fcoe: FCoE version "
1821                                "mismatch: The frame has "
1822                                "version %x, but the "
1823                                "initiator supports version "
1824                                "%x\n", FC_FCOE_DECAPS_VER(hp),
1825                                FC_FCOE_VER);
1826                 goto drop;
1827         }
1828
1829         skb_pull(skb, sizeof(struct fcoe_hdr));
1830         fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1831
1832         stats->RxFrames++;
1833         stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1834
1835         fp = (struct fc_frame *)skb;
1836         fc_frame_init(fp);
1837         fr_dev(fp) = lport;
1838         fr_sof(fp) = hp->fcoe_sof;
1839
1840         /* Copy out the CRC and EOF trailer for access */
1841         if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1842                 goto drop;
1843         fr_eof(fp) = crc_eof.fcoe_eof;
1844         fr_crc(fp) = crc_eof.fcoe_crc32;
1845         if (pskb_trim(skb, fr_len))
1846                 goto drop;
1847
1848         if (!fcoe_filter_frames(lport, fp)) {
1849                 put_cpu();
1850                 fc_exch_recv(lport, fp);
1851                 return;
1852         }
1853 drop:
1854         stats->ErrorFrames++;
1855         put_cpu();
1856         kfree_skb(skb);
1857 }
1858
1859 /**
1860  * fcoe_percpu_receive_thread() - The per-CPU packet receive thread
1861  * @arg: The per-CPU context
1862  *
1863  * Return: 0 for success
1864  */
1865 static int fcoe_percpu_receive_thread(void *arg)
1866 {
1867         struct fcoe_percpu_s *p = arg;
1868         struct sk_buff *skb;
1869         struct sk_buff_head tmp;
1870
1871         skb_queue_head_init(&tmp);
1872
1873         set_user_nice(current, MIN_NICE);
1874
1875         while (!kthread_should_stop()) {
1876
1877                 spin_lock_bh(&p->fcoe_rx_list.lock);
1878                 skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
1879
1880                 if (!skb_queue_len(&tmp)) {
1881                         set_current_state(TASK_INTERRUPTIBLE);
1882                         spin_unlock_bh(&p->fcoe_rx_list.lock);
1883                         schedule();
1884                         continue;
1885                 }
1886
1887                 spin_unlock_bh(&p->fcoe_rx_list.lock);
1888
1889                 while ((skb = __skb_dequeue(&tmp)) != NULL)
1890                         fcoe_recv_frame(skb);
1891
1892         }
1893         return 0;
1894 }
1895
1896 /**
1897  * fcoe_dev_setup() - Setup the link change notification interface
1898  */
1899 static void fcoe_dev_setup(void)
1900 {
1901         register_dcbevent_notifier(&dcb_notifier);
1902         register_netdevice_notifier(&fcoe_notifier);
1903 }
1904
1905 /**
1906  * fcoe_dev_cleanup() - Cleanup the link change notification interface
1907  */
1908 static void fcoe_dev_cleanup(void)
1909 {
1910         unregister_dcbevent_notifier(&dcb_notifier);
1911         unregister_netdevice_notifier(&fcoe_notifier);
1912 }
1913
1914 static struct fcoe_interface *
1915 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
1916 {
1917         struct fcoe_interface *fcoe;
1918         struct net_device *real_dev;
1919
1920         list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1921                 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
1922                         real_dev = vlan_dev_real_dev(fcoe->netdev);
1923                 else
1924                         real_dev = fcoe->netdev;
1925
1926                 if (netdev == real_dev)
1927                         return fcoe;
1928         }
1929         return NULL;
1930 }
1931
1932 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
1933                                      ulong event, void *ptr)
1934 {
1935         struct dcb_app_type *entry = ptr;
1936         struct fcoe_ctlr *ctlr;
1937         struct fcoe_interface *fcoe;
1938         struct net_device *netdev;
1939         int prio;
1940
1941         if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
1942                 return NOTIFY_OK;
1943
1944         netdev = dev_get_by_index(&init_net, entry->ifindex);
1945         if (!netdev)
1946                 return NOTIFY_OK;
1947
1948         fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
1949         dev_put(netdev);
1950         if (!fcoe)
1951                 return NOTIFY_OK;
1952
1953         ctlr = fcoe_to_ctlr(fcoe);
1954
1955         if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
1956                 prio = ffs(entry->app.priority) - 1;
1957         else
1958                 prio = entry->app.priority;
1959
1960         if (prio < 0)
1961                 return NOTIFY_OK;
1962
1963         if (entry->app.protocol == ETH_P_FIP ||
1964             entry->app.protocol == ETH_P_FCOE)
1965                 ctlr->priority = prio;
1966
1967         if (entry->app.protocol == ETH_P_FCOE)
1968                 fcoe->priority = prio;
1969
1970         return NOTIFY_OK;
1971 }
1972
1973 /**
1974  * fcoe_device_notification() - Handler for net device events
1975  * @notifier: The context of the notification
1976  * @event:    The type of event
1977  * @ptr:      The net device that the event was on
1978  *
1979  * This function is called by the Ethernet driver in case of link change event.
1980  *
1981  * Returns: 0 for success
1982  */
1983 static int fcoe_device_notification(struct notifier_block *notifier,
1984                                     ulong event, void *ptr)
1985 {
1986         struct fcoe_ctlr_device *cdev;
1987         struct fc_lport *lport = NULL;
1988         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1989         struct fcoe_ctlr *ctlr;
1990         struct fcoe_interface *fcoe;
1991         struct fcoe_port *port;
1992         struct fc_stats *stats;
1993         u32 link_possible = 1;
1994         u32 mfs;
1995         int rc = NOTIFY_OK;
1996
1997         list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1998                 if (fcoe->netdev == netdev) {
1999                         ctlr = fcoe_to_ctlr(fcoe);
2000                         lport = ctlr->lp;
2001                         break;
2002                 }
2003         }
2004         if (!lport) {
2005                 rc = NOTIFY_DONE;
2006                 goto out;
2007         }
2008
2009         switch (event) {
2010         case NETDEV_DOWN:
2011         case NETDEV_GOING_DOWN:
2012                 link_possible = 0;
2013                 break;
2014         case NETDEV_UP:
2015         case NETDEV_CHANGE:
2016                 break;
2017         case NETDEV_CHANGEMTU:
2018                 if (netdev->features & NETIF_F_FCOE_MTU)
2019                         break;
2020                 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
2021                                      sizeof(struct fcoe_crc_eof));
2022                 if (mfs >= FC_MIN_MAX_FRAME)
2023                         fc_set_mfs(lport, mfs);
2024                 break;
2025         case NETDEV_REGISTER:
2026                 break;
2027         case NETDEV_UNREGISTER:
2028                 list_del(&fcoe->list);
2029                 port = lport_priv(ctlr->lp);
2030                 queue_work(fcoe_wq, &port->destroy_work);
2031                 goto out;
2032                 break;
2033         case NETDEV_FEAT_CHANGE:
2034                 fcoe_netdev_features_change(lport, netdev);
2035                 break;
2036         default:
2037                 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
2038                                 "from netdev netlink\n", event);
2039         }
2040
2041         fcoe_link_speed_update(lport);
2042
2043         cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2044
2045         if (link_possible && !fcoe_link_ok(lport)) {
2046                 switch (cdev->enabled) {
2047                 case FCOE_CTLR_DISABLED:
2048                         pr_info("Link up while interface is disabled.\n");
2049                         break;
2050                 case FCOE_CTLR_ENABLED:
2051                 case FCOE_CTLR_UNUSED:
2052                         fcoe_ctlr_link_up(ctlr);
2053                 };
2054         } else if (fcoe_ctlr_link_down(ctlr)) {
2055                 switch (cdev->enabled) {
2056                 case FCOE_CTLR_DISABLED:
2057                         pr_info("Link down while interface is disabled.\n");
2058                         break;
2059                 case FCOE_CTLR_ENABLED:
2060                 case FCOE_CTLR_UNUSED:
2061                         stats = per_cpu_ptr(lport->stats, get_cpu());
2062                         stats->LinkFailureCount++;
2063                         put_cpu();
2064                         fcoe_clean_pending_queue(lport);
2065                 };
2066         }
2067 out:
2068         return rc;
2069 }
2070
2071 /**
2072  * fcoe_disable() - Disables a FCoE interface
2073  * @netdev  : The net_device object the Ethernet interface to create on
2074  *
2075  * Called from fcoe transport.
2076  *
2077  * Returns: 0 for success
2078  *
2079  * Deprecated: use fcoe_ctlr_enabled()
2080  */
2081 static int fcoe_disable(struct net_device *netdev)
2082 {
2083         struct fcoe_ctlr *ctlr;
2084         struct fcoe_interface *fcoe;
2085         int rc = 0;
2086
2087         mutex_lock(&fcoe_config_mutex);
2088
2089         rtnl_lock();
2090         fcoe = fcoe_hostlist_lookup_port(netdev);
2091         rtnl_unlock();
2092
2093         if (fcoe) {
2094                 ctlr = fcoe_to_ctlr(fcoe);
2095                 fcoe_ctlr_link_down(ctlr);
2096                 fcoe_clean_pending_queue(ctlr->lp);
2097         } else
2098                 rc = -ENODEV;
2099
2100         mutex_unlock(&fcoe_config_mutex);
2101         return rc;
2102 }
2103
2104 /**
2105  * fcoe_enable() - Enables a FCoE interface
2106  * @netdev  : The net_device object the Ethernet interface to create on
2107  *
2108  * Called from fcoe transport.
2109  *
2110  * Returns: 0 for success
2111  */
2112 static int fcoe_enable(struct net_device *netdev)
2113 {
2114         struct fcoe_ctlr *ctlr;
2115         struct fcoe_interface *fcoe;
2116         int rc = 0;
2117
2118         mutex_lock(&fcoe_config_mutex);
2119         rtnl_lock();
2120         fcoe = fcoe_hostlist_lookup_port(netdev);
2121         rtnl_unlock();
2122
2123         if (!fcoe) {
2124                 rc = -ENODEV;
2125                 goto out;
2126         }
2127
2128         ctlr = fcoe_to_ctlr(fcoe);
2129
2130         if (!fcoe_link_ok(ctlr->lp))
2131                 fcoe_ctlr_link_up(ctlr);
2132
2133 out:
2134         mutex_unlock(&fcoe_config_mutex);
2135         return rc;
2136 }
2137
2138 /**
2139  * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
2140  * @cdev: The FCoE Controller that is being enabled or disabled
2141  *
2142  * fcoe_sysfs will ensure that the state of 'enabled' has
2143  * changed, so no checking is necessary here. This routine simply
2144  * calls fcoe_enable or fcoe_disable, both of which are deprecated.
2145  * When those routines are removed the functionality can be merged
2146  * here.
2147  */
2148 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
2149 {
2150         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
2151         struct fc_lport *lport = ctlr->lp;
2152         struct net_device *netdev = fcoe_netdev(lport);
2153
2154         switch (cdev->enabled) {
2155         case FCOE_CTLR_ENABLED:
2156                 return fcoe_enable(netdev);
2157         case FCOE_CTLR_DISABLED:
2158                 return fcoe_disable(netdev);
2159         case FCOE_CTLR_UNUSED:
2160         default:
2161                 return -ENOTSUPP;
2162         };
2163 }
2164
2165 /**
2166  * fcoe_destroy() - Destroy a FCoE interface
2167  * @netdev  : The net_device object the Ethernet interface to create on
2168  *
2169  * Called from fcoe transport
2170  *
2171  * Returns: 0 for success
2172  */
2173 static int fcoe_destroy(struct net_device *netdev)
2174 {
2175         struct fcoe_ctlr *ctlr;
2176         struct fcoe_interface *fcoe;
2177         struct fc_lport *lport;
2178         struct fcoe_port *port;
2179         int rc = 0;
2180
2181         mutex_lock(&fcoe_config_mutex);
2182         rtnl_lock();
2183         fcoe = fcoe_hostlist_lookup_port(netdev);
2184         if (!fcoe) {
2185                 rc = -ENODEV;
2186                 goto out_nodev;
2187         }
2188         ctlr = fcoe_to_ctlr(fcoe);
2189         lport = ctlr->lp;
2190         port = lport_priv(lport);
2191         list_del(&fcoe->list);
2192         queue_work(fcoe_wq, &port->destroy_work);
2193 out_nodev:
2194         rtnl_unlock();
2195         mutex_unlock(&fcoe_config_mutex);
2196         return rc;
2197 }
2198
2199 /**
2200  * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2201  * @work: Handle to the FCoE port to be destroyed
2202  */
2203 static void fcoe_destroy_work(struct work_struct *work)
2204 {
2205         struct fcoe_ctlr_device *cdev;
2206         struct fcoe_ctlr *ctlr;
2207         struct fcoe_port *port;
2208         struct fcoe_interface *fcoe;
2209         struct Scsi_Host *shost;
2210         struct fc_host_attrs *fc_host;
2211         unsigned long flags;
2212         struct fc_vport *vport;
2213         struct fc_vport *next_vport;
2214
2215         port = container_of(work, struct fcoe_port, destroy_work);
2216         shost = port->lport->host;
2217         fc_host = shost_to_fc_host(shost);
2218
2219         /* Loop through all the vports and mark them for deletion */
2220         spin_lock_irqsave(shost->host_lock, flags);
2221         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2222                 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
2223                         continue;
2224                 } else {
2225                         vport->flags |= FC_VPORT_DELETING;
2226                         queue_work(fc_host_work_q(shost),
2227                                    &vport->vport_delete_work);
2228                 }
2229         }
2230         spin_unlock_irqrestore(shost->host_lock, flags);
2231
2232         flush_workqueue(fc_host_work_q(shost));
2233
2234         mutex_lock(&fcoe_config_mutex);
2235
2236         fcoe = port->priv;
2237         ctlr = fcoe_to_ctlr(fcoe);
2238         cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2239
2240         fcoe_if_destroy(port->lport);
2241         fcoe_interface_cleanup(fcoe);
2242
2243         mutex_unlock(&fcoe_config_mutex);
2244
2245         fcoe_ctlr_device_delete(cdev);
2246 }
2247
2248 /**
2249  * fcoe_match() - Check if the FCoE is supported on the given netdevice
2250  * @netdev  : The net_device object the Ethernet interface to create on
2251  *
2252  * Called from fcoe transport.
2253  *
2254  * Returns: always returns true as this is the default FCoE transport,
2255  * i.e., support all netdevs.
2256  */
2257 static bool fcoe_match(struct net_device *netdev)
2258 {
2259         return true;
2260 }
2261
2262 /**
2263  * fcoe_dcb_create() - Initialize DCB attributes and hooks
2264  * @netdev: The net_device object of the L2 link that should be queried
2265  * @port: The fcoe_port to bind FCoE APP priority with
2266  * @
2267  */
2268 static void fcoe_dcb_create(struct fcoe_interface *fcoe)
2269 {
2270 #ifdef CONFIG_DCB
2271         int dcbx;
2272         u8 fup, up;
2273         struct net_device *netdev = fcoe->realdev;
2274         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2275         struct dcb_app app = {
2276                                 .priority = 0,
2277                                 .protocol = ETH_P_FCOE
2278                              };
2279
2280         /* setup DCB priority attributes. */
2281         if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
2282                 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
2283
2284                 if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
2285                         app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
2286                         up = dcb_ieee_getapp_mask(netdev, &app);
2287                         app.protocol = ETH_P_FIP;
2288                         fup = dcb_ieee_getapp_mask(netdev, &app);
2289                 } else {
2290                         app.selector = DCB_APP_IDTYPE_ETHTYPE;
2291                         up = dcb_getapp(netdev, &app);
2292                         app.protocol = ETH_P_FIP;
2293                         fup = dcb_getapp(netdev, &app);
2294                 }
2295
2296                 fcoe->priority = ffs(up) ? ffs(up) - 1 : 0;
2297                 ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority;
2298         }
2299 #endif
2300 }
2301
2302 enum fcoe_create_link_state {
2303         FCOE_CREATE_LINK_DOWN,
2304         FCOE_CREATE_LINK_UP,
2305 };
2306
2307 /**
2308  * _fcoe_create() - (internal) Create a fcoe interface
2309  * @netdev  :   The net_device object the Ethernet interface to create on
2310  * @fip_mode:   The FIP mode for this creation
2311  * @link_state: The ctlr link state on creation
2312  *
2313  * Called from either the libfcoe 'create' module parameter
2314  * via fcoe_create or from fcoe_syfs's ctlr_create file.
2315  *
2316  * libfcoe's 'create' module parameter is deprecated so some
2317  * consolidation of code can be done when that interface is
2318  * removed.
2319  */
2320 static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode,
2321                         enum fcoe_create_link_state link_state)
2322 {
2323         int rc = 0;
2324         struct fcoe_ctlr_device *ctlr_dev;
2325         struct fcoe_ctlr *ctlr;
2326         struct fcoe_interface *fcoe;
2327         struct fc_lport *lport;
2328
2329         mutex_lock(&fcoe_config_mutex);
2330         rtnl_lock();
2331
2332         /* look for existing lport */
2333         if (fcoe_hostlist_lookup(netdev)) {
2334                 rc = -EEXIST;
2335                 goto out_nodev;
2336         }
2337
2338         fcoe = fcoe_interface_create(netdev, fip_mode);
2339         if (IS_ERR(fcoe)) {
2340                 rc = PTR_ERR(fcoe);
2341                 goto out_nodev;
2342         }
2343
2344         ctlr = fcoe_to_ctlr(fcoe);
2345         ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
2346         lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
2347         if (IS_ERR(lport)) {
2348                 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2349                        netdev->name);
2350                 rc = -EIO;
2351                 rtnl_unlock();
2352                 fcoe_interface_cleanup(fcoe);
2353                 mutex_unlock(&fcoe_config_mutex);
2354                 fcoe_ctlr_device_delete(ctlr_dev);
2355                 goto out;
2356         }
2357
2358         /* Make this the "master" N_Port */
2359         ctlr->lp = lport;
2360
2361         /* setup DCB priority attributes. */
2362         fcoe_dcb_create(fcoe);
2363
2364         /* start FIP Discovery and FLOGI */
2365         lport->boot_time = jiffies;
2366         fc_fabric_login(lport);
2367
2368         /*
2369          * If the fcoe_ctlr_device is to be set to DISABLED
2370          * it must be done after the lport is added to the
2371          * hostlist, but before the rtnl_lock is released.
2372          * This is because the rtnl_lock protects the
2373          * hostlist that fcoe_device_notification uses. If
2374          * the FCoE Controller is intended to be created
2375          * DISABLED then 'enabled' needs to be considered
2376          * handling link events. 'enabled' must be set
2377          * before the lport can be found in the hostlist
2378          * when a link up event is received.
2379          */
2380         if (link_state == FCOE_CREATE_LINK_UP)
2381                 ctlr_dev->enabled = FCOE_CTLR_ENABLED;
2382         else
2383                 ctlr_dev->enabled = FCOE_CTLR_DISABLED;
2384
2385         if (link_state == FCOE_CREATE_LINK_UP &&
2386             !fcoe_link_ok(lport)) {
2387                 rtnl_unlock();
2388                 fcoe_ctlr_link_up(ctlr);
2389                 mutex_unlock(&fcoe_config_mutex);
2390                 return rc;
2391         }
2392
2393 out_nodev:
2394         rtnl_unlock();
2395         mutex_unlock(&fcoe_config_mutex);
2396 out:
2397         return rc;
2398 }
2399
2400 /**
2401  * fcoe_create() - Create a fcoe interface
2402  * @netdev  : The net_device object the Ethernet interface to create on
2403  * @fip_mode: The FIP mode for this creation
2404  *
2405  * Called from fcoe transport
2406  *
2407  * Returns: 0 for success
2408  */
2409 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
2410 {
2411         return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
2412 }
2413
2414 /**
2415  * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
2416  * @netdev: The net_device to be used by the allocated FCoE Controller
2417  *
2418  * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
2419  * in a link_down state. The allows the user an opportunity to configure
2420  * the FCoE Controller from sysfs before enabling the FCoE Controller.
2421  *
2422  * Creating in with this routine starts the FCoE Controller in Fabric
2423  * mode. The user can change to VN2VN or another mode before enabling.
2424  */
2425 static int fcoe_ctlr_alloc(struct net_device *netdev)
2426 {
2427         return _fcoe_create(netdev, FIP_MODE_FABRIC,
2428                             FCOE_CREATE_LINK_DOWN);
2429 }
2430
2431 /**
2432  * fcoe_link_ok() - Check if the link is OK for a local port
2433  * @lport: The local port to check link on
2434  *
2435  * Returns: 0 if link is UP and OK, -1 if not
2436  *
2437  */
2438 static int fcoe_link_ok(struct fc_lport *lport)
2439 {
2440         struct net_device *netdev = fcoe_netdev(lport);
2441
2442         if (netif_oper_up(netdev))
2443                 return 0;
2444         return -1;
2445 }
2446
2447 /**
2448  * fcoe_percpu_clean() - Clear all pending skbs for an local port
2449  * @lport: The local port whose skbs are to be cleared
2450  *
2451  * Must be called with fcoe_create_mutex held to single-thread completion.
2452  *
2453  * This flushes the pending skbs by adding a new skb to each queue and
2454  * waiting until they are all freed.  This assures us that not only are
2455  * there no packets that will be handled by the lport, but also that any
2456  * threads already handling packet have returned.
2457  */
2458 static void fcoe_percpu_clean(struct fc_lport *lport)
2459 {
2460         struct fcoe_percpu_s *pp;
2461         struct sk_buff *skb;
2462         unsigned int cpu;
2463
2464         for_each_possible_cpu(cpu) {
2465                 pp = &per_cpu(fcoe_percpu, cpu);
2466
2467                 if (!pp->thread || !cpu_online(cpu))
2468                         continue;
2469
2470                 skb = dev_alloc_skb(0);
2471                 if (!skb)
2472                         continue;
2473
2474                 skb->destructor = fcoe_percpu_flush_done;
2475
2476                 spin_lock_bh(&pp->fcoe_rx_list.lock);
2477                 __skb_queue_tail(&pp->fcoe_rx_list, skb);
2478                 if (pp->fcoe_rx_list.qlen == 1)
2479                         wake_up_process(pp->thread);
2480                 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2481
2482                 wait_for_completion(&fcoe_flush_completion);
2483         }
2484 }
2485
2486 /**
2487  * fcoe_reset() - Reset a local port
2488  * @shost: The SCSI host associated with the local port to be reset
2489  *
2490  * Returns: Always 0 (return value required by FC transport template)
2491  */
2492 static int fcoe_reset(struct Scsi_Host *shost)
2493 {
2494         struct fc_lport *lport = shost_priv(shost);
2495         struct fcoe_port *port = lport_priv(lport);
2496         struct fcoe_interface *fcoe = port->priv;
2497         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2498         struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2499
2500         fcoe_ctlr_link_down(ctlr);
2501         fcoe_clean_pending_queue(ctlr->lp);
2502
2503         if (cdev->enabled != FCOE_CTLR_DISABLED &&
2504             !fcoe_link_ok(ctlr->lp))
2505                 fcoe_ctlr_link_up(ctlr);
2506         return 0;
2507 }
2508
2509 /**
2510  * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2511  * @netdev: The net device used as a key
2512  *
2513  * Locking: Must be called with the RNL mutex held.
2514  *
2515  * Returns: NULL or the FCoE interface
2516  */
2517 static struct fcoe_interface *
2518 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2519 {
2520         struct fcoe_interface *fcoe;
2521
2522         list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2523                 if (fcoe->netdev == netdev)
2524                         return fcoe;
2525         }
2526         return NULL;
2527 }
2528
2529 /**
2530  * fcoe_hostlist_lookup() - Find the local port associated with a
2531  *                          given net device
2532  * @netdev: The netdevice used as a key
2533  *
2534  * Locking: Must be called with the RTNL mutex held
2535  *
2536  * Returns: NULL or the local port
2537  */
2538 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2539 {
2540         struct fcoe_ctlr *ctlr;
2541         struct fcoe_interface *fcoe;
2542
2543         fcoe = fcoe_hostlist_lookup_port(netdev);
2544         ctlr = fcoe_to_ctlr(fcoe);
2545         return (fcoe) ? ctlr->lp : NULL;
2546 }
2547
2548 /**
2549  * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2550  *                       port to the hostlist
2551  * @lport: The local port that identifies the FCoE interface to be added
2552  *
2553  * Locking: must be called with the RTNL mutex held
2554  *
2555  * Returns: 0 for success
2556  */
2557 static int fcoe_hostlist_add(const struct fc_lport *lport)
2558 {
2559         struct fcoe_interface *fcoe;
2560         struct fcoe_port *port;
2561
2562         fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2563         if (!fcoe) {
2564                 port = lport_priv(lport);
2565                 fcoe = port->priv;
2566                 list_add_tail(&fcoe->list, &fcoe_hostlist);
2567         }
2568         return 0;
2569 }
2570
2571 /**
2572  * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
2573  *                       port to the hostlist
2574  * @lport: The local port that identifies the FCoE interface to be added
2575  *
2576  * Locking: must be called with the RTNL mutex held
2577  *
2578  */
2579 static void fcoe_hostlist_del(const struct fc_lport *lport)
2580 {
2581         struct fcoe_interface *fcoe;
2582         struct fcoe_port *port;
2583
2584         port = lport_priv(lport);
2585         fcoe = port->priv;
2586         list_del(&fcoe->list);
2587         return;
2588 }
2589
2590 static struct fcoe_transport fcoe_sw_transport = {
2591         .name = {FCOE_TRANSPORT_DEFAULT},
2592         .attached = false,
2593         .list = LIST_HEAD_INIT(fcoe_sw_transport.list),
2594         .match = fcoe_match,
2595         .alloc = fcoe_ctlr_alloc,
2596         .create = fcoe_create,
2597         .destroy = fcoe_destroy,
2598         .enable = fcoe_enable,
2599         .disable = fcoe_disable,
2600 };
2601
2602 /**
2603  * fcoe_init() - Initialize fcoe.ko
2604  *
2605  * Returns: 0 on success, or a negative value on failure
2606  */
2607 static int __init fcoe_init(void)
2608 {
2609         struct fcoe_percpu_s *p;
2610         unsigned int cpu;
2611         int rc = 0;
2612
2613         fcoe_wq = alloc_workqueue("fcoe", 0, 0);
2614         if (!fcoe_wq)
2615                 return -ENOMEM;
2616
2617         /* register as a fcoe transport */
2618         rc = fcoe_transport_attach(&fcoe_sw_transport);
2619         if (rc) {
2620                 printk(KERN_ERR "failed to register an fcoe transport, check "
2621                         "if libfcoe is loaded\n");
2622                 return rc;
2623         }
2624
2625         mutex_lock(&fcoe_config_mutex);
2626
2627         for_each_possible_cpu(cpu) {
2628                 p = &per_cpu(fcoe_percpu, cpu);
2629                 skb_queue_head_init(&p->fcoe_rx_list);
2630         }
2631
2632         cpu_notifier_register_begin();
2633
2634         for_each_online_cpu(cpu)
2635                 fcoe_percpu_thread_create(cpu);
2636
2637         /* Initialize per CPU interrupt thread */
2638         rc = __register_hotcpu_notifier(&fcoe_cpu_notifier);
2639         if (rc)
2640                 goto out_free;
2641
2642         cpu_notifier_register_done();
2643
2644         /* Setup link change notification */
2645         fcoe_dev_setup();
2646
2647         rc = fcoe_if_init();
2648         if (rc)
2649                 goto out_free;
2650
2651         mutex_unlock(&fcoe_config_mutex);
2652         return 0;
2653
2654 out_free:
2655         for_each_online_cpu(cpu) {
2656                 fcoe_percpu_thread_destroy(cpu);
2657         }
2658
2659         cpu_notifier_register_done();
2660
2661         mutex_unlock(&fcoe_config_mutex);
2662         destroy_workqueue(fcoe_wq);
2663         return rc;
2664 }
2665 module_init(fcoe_init);
2666
2667 /**
2668  * fcoe_exit() - Clean up fcoe.ko
2669  *
2670  * Returns: 0 on success or a  negative value on failure
2671  */
2672 static void __exit fcoe_exit(void)
2673 {
2674         struct fcoe_interface *fcoe, *tmp;
2675         struct fcoe_ctlr *ctlr;
2676         struct fcoe_port *port;
2677         unsigned int cpu;
2678
2679         mutex_lock(&fcoe_config_mutex);
2680
2681         fcoe_dev_cleanup();
2682
2683         /* releases the associated fcoe hosts */
2684         rtnl_lock();
2685         list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2686                 ctlr = fcoe_to_ctlr(fcoe);
2687                 port = lport_priv(ctlr->lp);
2688                 fcoe_hostlist_del(port->lport);
2689                 queue_work(fcoe_wq, &port->destroy_work);
2690         }
2691         rtnl_unlock();
2692
2693         cpu_notifier_register_begin();
2694
2695         for_each_online_cpu(cpu)
2696                 fcoe_percpu_thread_destroy(cpu);
2697
2698         __unregister_hotcpu_notifier(&fcoe_cpu_notifier);
2699
2700         cpu_notifier_register_done();
2701
2702         mutex_unlock(&fcoe_config_mutex);
2703
2704         /*
2705          * destroy_work's may be chained but destroy_workqueue()
2706          * can take care of them. Just kill the fcoe_wq.
2707          */
2708         destroy_workqueue(fcoe_wq);
2709
2710         /*
2711          * Detaching from the scsi transport must happen after all
2712          * destroys are done on the fcoe_wq. destroy_workqueue will
2713          * enusre the fcoe_wq is flushed.
2714          */
2715         fcoe_if_exit();
2716
2717         /* detach from fcoe transport */
2718         fcoe_transport_detach(&fcoe_sw_transport);
2719 }
2720 module_exit(fcoe_exit);
2721
2722 /**
2723  * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2724  * @seq: active sequence in the FLOGI or FDISC exchange
2725  * @fp: response frame, or error encoded in a pointer (timeout)
2726  * @arg: pointer the the fcoe_ctlr structure
2727  *
2728  * This handles MAC address management for FCoE, then passes control on to
2729  * the libfc FLOGI response handler.
2730  */
2731 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2732 {
2733         struct fcoe_ctlr *fip = arg;
2734         struct fc_exch *exch = fc_seq_exch(seq);
2735         struct fc_lport *lport = exch->lp;
2736         u8 *mac;
2737
2738         if (IS_ERR(fp))
2739                 goto done;
2740
2741         mac = fr_cb(fp)->granted_mac;
2742         /* pre-FIP */
2743         if (is_zero_ether_addr(mac))
2744                 fcoe_ctlr_recv_flogi(fip, lport, fp);
2745         if (!is_zero_ether_addr(mac))
2746                 fcoe_update_src_mac(lport, mac);
2747 done:
2748         fc_lport_flogi_resp(seq, fp, lport);
2749 }
2750
2751 /**
2752  * fcoe_logo_resp() - FCoE specific LOGO response handler
2753  * @seq: active sequence in the LOGO exchange
2754  * @fp: response frame, or error encoded in a pointer (timeout)
2755  * @arg: pointer the the fcoe_ctlr structure
2756  *
2757  * This handles MAC address management for FCoE, then passes control on to
2758  * the libfc LOGO response handler.
2759  */
2760 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2761 {
2762         struct fc_lport *lport = arg;
2763         static u8 zero_mac[ETH_ALEN] = { 0 };
2764
2765         if (!IS_ERR(fp))
2766                 fcoe_update_src_mac(lport, zero_mac);
2767         fc_lport_logo_resp(seq, fp, lport);
2768 }
2769
2770 /**
2771  * fcoe_elsct_send - FCoE specific ELS handler
2772  *
2773  * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2774  * using FCoE specific response handlers and passing the FIP controller as
2775  * the argument (the lport is still available from the exchange).
2776  *
2777  * Most of the work here is just handed off to the libfc routine.
2778  */
2779 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2780                                       struct fc_frame *fp, unsigned int op,
2781                                       void (*resp)(struct fc_seq *,
2782                                                    struct fc_frame *,
2783                                                    void *),
2784                                       void *arg, u32 timeout)
2785 {
2786         struct fcoe_port *port = lport_priv(lport);
2787         struct fcoe_interface *fcoe = port->priv;
2788         struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
2789         struct fc_frame_header *fh = fc_frame_header_get(fp);
2790
2791         switch (op) {
2792         case ELS_FLOGI:
2793         case ELS_FDISC:
2794                 if (lport->point_to_multipoint)
2795                         break;
2796                 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2797                                      fip, timeout);
2798         case ELS_LOGO:
2799                 /* only hook onto fabric logouts, not port logouts */
2800                 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2801                         break;
2802                 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2803                                      lport, timeout);
2804         }
2805         return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2806 }
2807
2808 /**
2809  * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2810  * @vport: fc_vport object to create a new fc_host for
2811  * @disabled: start the new fc_host in a disabled state by default?
2812  *
2813  * Returns: 0 for success
2814  */
2815 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2816 {
2817         struct Scsi_Host *shost = vport_to_shost(vport);
2818         struct fc_lport *n_port = shost_priv(shost);
2819         struct fcoe_port *port = lport_priv(n_port);
2820         struct fcoe_interface *fcoe = port->priv;
2821         struct net_device *netdev = fcoe->netdev;
2822         struct fc_lport *vn_port;
2823         int rc;
2824         char buf[32];
2825
2826         rc = fcoe_validate_vport_create(vport);
2827         if (rc) {
2828                 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
2829                 printk(KERN_ERR "fcoe: Failed to create vport, "
2830                         "WWPN (0x%s) already exists\n",
2831                         buf);
2832                 return rc;
2833         }
2834
2835         mutex_lock(&fcoe_config_mutex);
2836         rtnl_lock();
2837         vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2838         rtnl_unlock();
2839         mutex_unlock(&fcoe_config_mutex);
2840
2841         if (IS_ERR(vn_port)) {
2842                 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2843                        netdev->name);
2844                 return -EIO;
2845         }
2846
2847         if (disabled) {
2848                 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2849         } else {
2850                 vn_port->boot_time = jiffies;
2851                 fc_fabric_login(vn_port);
2852                 fc_vport_setlink(vn_port);
2853         }
2854         return 0;
2855 }
2856
2857 /**
2858  * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2859  * @vport: fc_vport object that is being destroyed
2860  *
2861  * Returns: 0 for success
2862  */
2863 static int fcoe_vport_destroy(struct fc_vport *vport)
2864 {
2865         struct Scsi_Host *shost = vport_to_shost(vport);
2866         struct fc_lport *n_port = shost_priv(shost);
2867         struct fc_lport *vn_port = vport->dd_data;
2868
2869         mutex_lock(&n_port->lp_mutex);
2870         list_del(&vn_port->list);
2871         mutex_unlock(&n_port->lp_mutex);
2872
2873         mutex_lock(&fcoe_config_mutex);
2874         fcoe_if_destroy(vn_port);
2875         mutex_unlock(&fcoe_config_mutex);
2876
2877         return 0;
2878 }
2879
2880 /**
2881  * fcoe_vport_disable() - change vport state
2882  * @vport: vport to bring online/offline
2883  * @disable: should the vport be disabled?
2884  */
2885 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2886 {
2887         struct fc_lport *lport = vport->dd_data;
2888
2889         if (disable) {
2890                 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2891                 fc_fabric_logoff(lport);
2892         } else {
2893                 lport->boot_time = jiffies;
2894                 fc_fabric_login(lport);
2895                 fc_vport_setlink(lport);
2896         }
2897
2898         return 0;
2899 }
2900
2901 /**
2902  * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
2903  * @vport: fc_vport with a new symbolic name string
2904  *
2905  * After generating a new symbolic name string, a new RSPN_ID request is
2906  * sent to the name server.  There is no response handler, so if it fails
2907  * for some reason it will not be retried.
2908  */
2909 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2910 {
2911         struct fc_lport *lport = vport->dd_data;
2912         struct fc_frame *fp;
2913         size_t len;
2914
2915         snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2916                  "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2917                  fcoe_netdev(lport)->name, vport->symbolic_name);
2918
2919         if (lport->state != LPORT_ST_READY)
2920                 return;
2921
2922         len = strnlen(fc_host_symbolic_name(lport->host), 255);
2923         fp = fc_frame_alloc(lport,
2924                             sizeof(struct fc_ct_hdr) +
2925                             sizeof(struct fc_ns_rspn) + len);
2926         if (!fp)
2927                 return;
2928         lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2929                              NULL, NULL, 3 * lport->r_a_tov);
2930 }
2931
2932 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
2933 {
2934         struct fcoe_ctlr_device *ctlr_dev =
2935                 fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2936         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2937         struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2938
2939         fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
2940 }
2941
2942 /**
2943  * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2944  * @lport: the local port
2945  * @port_id: the port ID
2946  * @fp: the received frame, if any, that caused the port_id to be set.
2947  *
2948  * This routine handles the case where we received a FLOGI and are
2949  * entering point-to-point mode.  We need to call fcoe_ctlr_recv_flogi()
2950  * so it can set the non-mapped mode and gateway address.
2951  *
2952  * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2953  */
2954 static void fcoe_set_port_id(struct fc_lport *lport,
2955                              u32 port_id, struct fc_frame *fp)
2956 {
2957         struct fcoe_port *port = lport_priv(lport);
2958         struct fcoe_interface *fcoe = port->priv;
2959         struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2960
2961         if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2962                 fcoe_ctlr_recv_flogi(ctlr, lport, fp);
2963 }