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