1 /* 2 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Maintained at www.Open-FCoE.org 18 */ 19 20 #include <linux/module.h> 21 #include <linux/spinlock.h> 22 #include <linux/netdevice.h> 23 #include <linux/etherdevice.h> 24 #include <linux/ethtool.h> 25 #include <linux/if_ether.h> 26 #include <linux/if_vlan.h> 27 #include <linux/crc32.h> 28 #include <linux/slab.h> 29 #include <linux/cpu.h> 30 #include <linux/fs.h> 31 #include <linux/sysfs.h> 32 #include <linux/ctype.h> 33 #include <linux/workqueue.h> 34 #include <net/dcbnl.h> 35 #include <net/dcbevent.h> 36 #include <scsi/scsi_tcq.h> 37 #include <scsi/scsicam.h> 38 #include <scsi/scsi_transport.h> 39 #include <scsi/scsi_transport_fc.h> 40 #include <net/rtnetlink.h> 41 42 #include <scsi/fc/fc_encaps.h> 43 #include <scsi/fc/fc_fip.h> 44 #include <scsi/fc/fc_fcoe.h> 45 46 #include <scsi/libfc.h> 47 #include <scsi/fc_frame.h> 48 #include <scsi/libfcoe.h> 49 50 #include "fcoe.h" 51 52 MODULE_AUTHOR("Open-FCoE.org"); 53 MODULE_DESCRIPTION("FCoE"); 54 MODULE_LICENSE("GPL v2"); 55 56 /* Performance tuning parameters for fcoe */ 57 static unsigned int fcoe_ddp_min = 4096; 58 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR); 59 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ 60 "Direct Data Placement (DDP)."); 61 62 unsigned int fcoe_debug_logging; 63 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR); 64 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 65 66 static DEFINE_MUTEX(fcoe_config_mutex); 67 68 static struct workqueue_struct *fcoe_wq; 69 70 /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */ 71 static DECLARE_COMPLETION(fcoe_flush_completion); 72 73 /* fcoe host list */ 74 /* must only by accessed under the RTNL mutex */ 75 static LIST_HEAD(fcoe_hostlist); 76 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); 77 78 /* Function Prototypes */ 79 static int fcoe_reset(struct Scsi_Host *); 80 static int fcoe_xmit(struct fc_lport *, struct fc_frame *); 81 static int fcoe_rcv(struct sk_buff *, struct net_device *, 82 struct packet_type *, struct net_device *); 83 static int fcoe_percpu_receive_thread(void *); 84 static void fcoe_percpu_clean(struct fc_lport *); 85 static int fcoe_link_ok(struct fc_lport *); 86 87 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); 88 static int fcoe_hostlist_add(const struct fc_lport *); 89 static void fcoe_hostlist_del(const struct fc_lport *); 90 91 static int fcoe_device_notification(struct notifier_block *, ulong, void *); 92 static void fcoe_dev_setup(void); 93 static void fcoe_dev_cleanup(void); 94 static struct fcoe_interface 95 *fcoe_hostlist_lookup_port(const struct net_device *); 96 97 static int fcoe_fip_recv(struct sk_buff *, struct net_device *, 98 struct packet_type *, struct net_device *); 99 100 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *); 101 static void fcoe_update_src_mac(struct fc_lport *, u8 *); 102 static u8 *fcoe_get_src_mac(struct fc_lport *); 103 static void fcoe_destroy_work(struct work_struct *); 104 105 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *, 106 unsigned int); 107 static int fcoe_ddp_done(struct fc_lport *, u16); 108 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *, 109 unsigned int); 110 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *); 111 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 112 ulong event, void *ptr); 113 114 static bool fcoe_match(struct net_device *netdev); 115 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode); 116 static int fcoe_destroy(struct net_device *netdev); 117 static int fcoe_enable(struct net_device *netdev); 118 static int fcoe_disable(struct net_device *netdev); 119 120 /* fcoe_syfs control interface handlers */ 121 static int fcoe_ctlr_alloc(struct net_device *netdev); 122 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev); 123 124 125 static struct fc_seq *fcoe_elsct_send(struct fc_lport *, 126 u32 did, struct fc_frame *, 127 unsigned int op, 128 void (*resp)(struct fc_seq *, 129 struct fc_frame *, 130 void *), 131 void *, u32 timeout); 132 static void fcoe_recv_frame(struct sk_buff *skb); 133 134 /* notification function for packets from net device */ 135 static struct notifier_block fcoe_notifier = { 136 .notifier_call = fcoe_device_notification, 137 }; 138 139 /* notification function for CPU hotplug events */ 140 static struct notifier_block fcoe_cpu_notifier = { 141 .notifier_call = fcoe_cpu_callback, 142 }; 143 144 /* notification function for DCB events */ 145 static struct notifier_block dcb_notifier = { 146 .notifier_call = fcoe_dcb_app_notification, 147 }; 148 149 static struct scsi_transport_template *fcoe_nport_scsi_transport; 150 static struct scsi_transport_template *fcoe_vport_scsi_transport; 151 152 static int fcoe_vport_destroy(struct fc_vport *); 153 static int fcoe_vport_create(struct fc_vport *, bool disabled); 154 static int fcoe_vport_disable(struct fc_vport *, bool disable); 155 static void fcoe_set_vport_symbolic_name(struct fc_vport *); 156 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *); 157 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *); 158 159 static struct fcoe_sysfs_function_template fcoe_sysfs_templ = { 160 .set_fcoe_ctlr_mode = fcoe_ctlr_set_fip_mode, 161 .set_fcoe_ctlr_enabled = fcoe_ctlr_enabled, 162 .get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb, 163 .get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb, 164 .get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb, 165 .get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb, 166 .get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb, 167 .get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb, 168 169 .get_fcoe_fcf_selected = fcoe_fcf_get_selected, 170 .get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id, 171 }; 172 173 static struct libfc_function_template fcoe_libfc_fcn_templ = { 174 .frame_send = fcoe_xmit, 175 .ddp_setup = fcoe_ddp_setup, 176 .ddp_done = fcoe_ddp_done, 177 .ddp_target = fcoe_ddp_target, 178 .elsct_send = fcoe_elsct_send, 179 .get_lesb = fcoe_get_lesb, 180 .lport_set_port_id = fcoe_set_port_id, 181 }; 182 183 static struct fc_function_template fcoe_nport_fc_functions = { 184 .show_host_node_name = 1, 185 .show_host_port_name = 1, 186 .show_host_supported_classes = 1, 187 .show_host_supported_fc4s = 1, 188 .show_host_active_fc4s = 1, 189 .show_host_maxframe_size = 1, 190 .show_host_serial_number = 1, 191 .show_host_manufacturer = 1, 192 .show_host_model = 1, 193 .show_host_model_description = 1, 194 .show_host_hardware_version = 1, 195 .show_host_driver_version = 1, 196 .show_host_firmware_version = 1, 197 .show_host_optionrom_version = 1, 198 199 .show_host_port_id = 1, 200 .show_host_supported_speeds = 1, 201 .get_host_speed = fc_get_host_speed, 202 .show_host_speed = 1, 203 .show_host_port_type = 1, 204 .get_host_port_state = fc_get_host_port_state, 205 .show_host_port_state = 1, 206 .show_host_symbolic_name = 1, 207 208 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), 209 .show_rport_maxframe_size = 1, 210 .show_rport_supported_classes = 1, 211 212 .show_host_fabric_name = 1, 213 .show_starget_node_name = 1, 214 .show_starget_port_name = 1, 215 .show_starget_port_id = 1, 216 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, 217 .show_rport_dev_loss_tmo = 1, 218 .get_fc_host_stats = fc_get_host_stats, 219 .issue_fc_host_lip = fcoe_reset, 220 221 .terminate_rport_io = fc_rport_terminate_io, 222 223 .vport_create = fcoe_vport_create, 224 .vport_delete = fcoe_vport_destroy, 225 .vport_disable = fcoe_vport_disable, 226 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name, 227 228 .bsg_request = fc_lport_bsg_request, 229 }; 230 231 static struct fc_function_template fcoe_vport_fc_functions = { 232 .show_host_node_name = 1, 233 .show_host_port_name = 1, 234 .show_host_supported_classes = 1, 235 .show_host_supported_fc4s = 1, 236 .show_host_active_fc4s = 1, 237 .show_host_maxframe_size = 1, 238 .show_host_serial_number = 1, 239 .show_host_manufacturer = 1, 240 .show_host_model = 1, 241 .show_host_model_description = 1, 242 .show_host_hardware_version = 1, 243 .show_host_driver_version = 1, 244 .show_host_firmware_version = 1, 245 .show_host_optionrom_version = 1, 246 247 .show_host_port_id = 1, 248 .show_host_supported_speeds = 1, 249 .get_host_speed = fc_get_host_speed, 250 .show_host_speed = 1, 251 .show_host_port_type = 1, 252 .get_host_port_state = fc_get_host_port_state, 253 .show_host_port_state = 1, 254 .show_host_symbolic_name = 1, 255 256 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), 257 .show_rport_maxframe_size = 1, 258 .show_rport_supported_classes = 1, 259 260 .show_host_fabric_name = 1, 261 .show_starget_node_name = 1, 262 .show_starget_port_name = 1, 263 .show_starget_port_id = 1, 264 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, 265 .show_rport_dev_loss_tmo = 1, 266 .get_fc_host_stats = fc_get_host_stats, 267 .issue_fc_host_lip = fcoe_reset, 268 269 .terminate_rport_io = fc_rport_terminate_io, 270 271 .bsg_request = fc_lport_bsg_request, 272 }; 273 274 static struct scsi_host_template fcoe_shost_template = { 275 .module = THIS_MODULE, 276 .name = "FCoE Driver", 277 .proc_name = FCOE_NAME, 278 .queuecommand = fc_queuecommand, 279 .eh_abort_handler = fc_eh_abort, 280 .eh_device_reset_handler = fc_eh_device_reset, 281 .eh_host_reset_handler = fc_eh_host_reset, 282 .slave_alloc = fc_slave_alloc, 283 .change_queue_depth = fc_change_queue_depth, 284 .change_queue_type = fc_change_queue_type, 285 .this_id = -1, 286 .cmd_per_lun = 3, 287 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, 288 .use_clustering = ENABLE_CLUSTERING, 289 .sg_tablesize = SG_ALL, 290 .max_sectors = 0xffff, 291 }; 292 293 /** 294 * fcoe_interface_setup() - Setup a FCoE interface 295 * @fcoe: The new FCoE interface 296 * @netdev: The net device that the fcoe interface is on 297 * 298 * Returns : 0 for success 299 * Locking: must be called with the RTNL mutex held 300 */ 301 static int fcoe_interface_setup(struct fcoe_interface *fcoe, 302 struct net_device *netdev) 303 { 304 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 305 struct netdev_hw_addr *ha; 306 struct net_device *real_dev; 307 u8 flogi_maddr[ETH_ALEN]; 308 const struct net_device_ops *ops; 309 310 fcoe->netdev = netdev; 311 312 /* Let LLD initialize for FCoE */ 313 ops = netdev->netdev_ops; 314 if (ops->ndo_fcoe_enable) { 315 if (ops->ndo_fcoe_enable(netdev)) 316 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" 317 " specific feature for LLD.\n"); 318 } 319 320 /* Do not support for bonding device */ 321 if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) { 322 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n"); 323 return -EOPNOTSUPP; 324 } 325 326 /* look for SAN MAC address, if multiple SAN MACs exist, only 327 * use the first one for SPMA */ 328 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ? 329 vlan_dev_real_dev(netdev) : netdev; 330 fcoe->realdev = real_dev; 331 rcu_read_lock(); 332 for_each_dev_addr(real_dev, ha) { 333 if ((ha->type == NETDEV_HW_ADDR_T_SAN) && 334 (is_valid_ether_addr(ha->addr))) { 335 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); 336 fip->spma = 1; 337 break; 338 } 339 } 340 rcu_read_unlock(); 341 342 /* setup Source Mac Address */ 343 if (!fip->spma) 344 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); 345 346 /* 347 * Add FCoE MAC address as second unicast MAC address 348 * or enter promiscuous mode if not capable of listening 349 * for multiple unicast MACs. 350 */ 351 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 352 dev_uc_add(netdev, flogi_maddr); 353 if (fip->spma) 354 dev_uc_add(netdev, fip->ctl_src_addr); 355 if (fip->mode == FIP_MODE_VN2VN) { 356 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS); 357 dev_mc_add(netdev, FIP_ALL_P2P_MACS); 358 } else 359 dev_mc_add(netdev, FIP_ALL_ENODE_MACS); 360 361 /* 362 * setup the receive function from ethernet driver 363 * on the ethertype for the given device 364 */ 365 fcoe->fcoe_packet_type.func = fcoe_rcv; 366 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); 367 fcoe->fcoe_packet_type.dev = netdev; 368 dev_add_pack(&fcoe->fcoe_packet_type); 369 370 fcoe->fip_packet_type.func = fcoe_fip_recv; 371 fcoe->fip_packet_type.type = htons(ETH_P_FIP); 372 fcoe->fip_packet_type.dev = netdev; 373 dev_add_pack(&fcoe->fip_packet_type); 374 375 return 0; 376 } 377 378 /** 379 * fcoe_interface_create() - Create a FCoE interface on a net device 380 * @netdev: The net device to create the FCoE interface on 381 * @fip_mode: The mode to use for FIP 382 * 383 * Returns: pointer to a struct fcoe_interface or NULL on error 384 */ 385 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev, 386 enum fip_state fip_mode) 387 { 388 struct fcoe_ctlr_device *ctlr_dev; 389 struct fcoe_ctlr *ctlr; 390 struct fcoe_interface *fcoe; 391 int size; 392 int err; 393 394 if (!try_module_get(THIS_MODULE)) { 395 FCOE_NETDEV_DBG(netdev, 396 "Could not get a reference to the module\n"); 397 fcoe = ERR_PTR(-EBUSY); 398 goto out; 399 } 400 401 size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface); 402 ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ, 403 size); 404 if (!ctlr_dev) { 405 FCOE_DBG("Failed to add fcoe_ctlr_device\n"); 406 fcoe = ERR_PTR(-ENOMEM); 407 goto out_putmod; 408 } 409 410 ctlr = fcoe_ctlr_device_priv(ctlr_dev); 411 fcoe = fcoe_ctlr_priv(ctlr); 412 413 dev_hold(netdev); 414 415 /* 416 * Initialize FIP. 417 */ 418 fcoe_ctlr_init(ctlr, fip_mode); 419 ctlr->send = fcoe_fip_send; 420 ctlr->update_mac = fcoe_update_src_mac; 421 ctlr->get_src_addr = fcoe_get_src_mac; 422 423 err = fcoe_interface_setup(fcoe, netdev); 424 if (err) { 425 fcoe_ctlr_destroy(ctlr); 426 fcoe_ctlr_device_delete(ctlr_dev); 427 dev_put(netdev); 428 fcoe = ERR_PTR(err); 429 goto out_putmod; 430 } 431 432 goto out; 433 434 out_putmod: 435 module_put(THIS_MODULE); 436 out: 437 return fcoe; 438 } 439 440 /** 441 * fcoe_interface_remove() - remove FCoE interface from netdev 442 * @fcoe: The FCoE interface to be cleaned up 443 * 444 * Caller must be holding the RTNL mutex 445 */ 446 static void fcoe_interface_remove(struct fcoe_interface *fcoe) 447 { 448 struct net_device *netdev = fcoe->netdev; 449 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 450 u8 flogi_maddr[ETH_ALEN]; 451 const struct net_device_ops *ops; 452 453 /* 454 * Don't listen for Ethernet packets anymore. 455 * synchronize_net() ensures that the packet handlers are not running 456 * on another CPU. dev_remove_pack() would do that, this calls the 457 * unsyncronized version __dev_remove_pack() to avoid multiple delays. 458 */ 459 __dev_remove_pack(&fcoe->fcoe_packet_type); 460 __dev_remove_pack(&fcoe->fip_packet_type); 461 synchronize_net(); 462 463 /* Delete secondary MAC addresses */ 464 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 465 dev_uc_del(netdev, flogi_maddr); 466 if (fip->spma) 467 dev_uc_del(netdev, fip->ctl_src_addr); 468 if (fip->mode == FIP_MODE_VN2VN) { 469 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS); 470 dev_mc_del(netdev, FIP_ALL_P2P_MACS); 471 } else 472 dev_mc_del(netdev, FIP_ALL_ENODE_MACS); 473 474 /* Tell the LLD we are done w/ FCoE */ 475 ops = netdev->netdev_ops; 476 if (ops->ndo_fcoe_disable) { 477 if (ops->ndo_fcoe_disable(netdev)) 478 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" 479 " specific feature for LLD.\n"); 480 } 481 fcoe->removed = 1; 482 } 483 484 485 /** 486 * fcoe_interface_cleanup() - Clean up a FCoE interface 487 * @fcoe: The FCoE interface to be cleaned up 488 */ 489 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe) 490 { 491 struct net_device *netdev = fcoe->netdev; 492 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 493 494 rtnl_lock(); 495 if (!fcoe->removed) 496 fcoe_interface_remove(fcoe); 497 rtnl_unlock(); 498 499 /* Release the self-reference taken during fcoe_interface_create() */ 500 /* tear-down the FCoE controller */ 501 fcoe_ctlr_destroy(fip); 502 scsi_host_put(fip->lp->host); 503 dev_put(netdev); 504 module_put(THIS_MODULE); 505 } 506 507 /** 508 * fcoe_fip_recv() - Handler for received FIP frames 509 * @skb: The receive skb 510 * @netdev: The associated net device 511 * @ptype: The packet_type structure which was used to register this handler 512 * @orig_dev: The original net_device the the skb was received on. 513 * (in case dev is a bond) 514 * 515 * Returns: 0 for success 516 */ 517 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev, 518 struct packet_type *ptype, 519 struct net_device *orig_dev) 520 { 521 struct fcoe_interface *fcoe; 522 struct fcoe_ctlr *ctlr; 523 524 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); 525 ctlr = fcoe_to_ctlr(fcoe); 526 fcoe_ctlr_recv(ctlr, skb); 527 return 0; 528 } 529 530 /** 531 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame 532 * @port: The FCoE port 533 * @skb: The FIP/FCoE packet to be sent 534 */ 535 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb) 536 { 537 if (port->fcoe_pending_queue.qlen) 538 fcoe_check_wait_queue(port->lport, skb); 539 else if (fcoe_start_io(skb)) 540 fcoe_check_wait_queue(port->lport, skb); 541 } 542 543 /** 544 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame 545 * @fip: The FCoE controller 546 * @skb: The FIP packet to be sent 547 */ 548 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 549 { 550 skb->dev = fcoe_from_ctlr(fip)->netdev; 551 fcoe_port_send(lport_priv(fip->lp), skb); 552 } 553 554 /** 555 * fcoe_update_src_mac() - Update the Ethernet MAC filters 556 * @lport: The local port to update the source MAC on 557 * @addr: Unicast MAC address to add 558 * 559 * Remove any previously-set unicast MAC filter. 560 * Add secondary FCoE MAC address filter for our OUI. 561 */ 562 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) 563 { 564 struct fcoe_port *port = lport_priv(lport); 565 struct fcoe_interface *fcoe = port->priv; 566 567 if (!is_zero_ether_addr(port->data_src_addr)) 568 dev_uc_del(fcoe->netdev, port->data_src_addr); 569 if (!is_zero_ether_addr(addr)) 570 dev_uc_add(fcoe->netdev, addr); 571 memcpy(port->data_src_addr, addr, ETH_ALEN); 572 } 573 574 /** 575 * fcoe_get_src_mac() - return the Ethernet source address for an lport 576 * @lport: libfc lport 577 */ 578 static u8 *fcoe_get_src_mac(struct fc_lport *lport) 579 { 580 struct fcoe_port *port = lport_priv(lport); 581 582 return port->data_src_addr; 583 } 584 585 /** 586 * fcoe_lport_config() - Set up a local port 587 * @lport: The local port to be setup 588 * 589 * Returns: 0 for success 590 */ 591 static int fcoe_lport_config(struct fc_lport *lport) 592 { 593 lport->link_up = 0; 594 lport->qfull = 0; 595 lport->max_retry_count = 3; 596 lport->max_rport_retry_count = 3; 597 lport->e_d_tov = 2 * 1000; /* FC-FS default */ 598 lport->r_a_tov = 2 * 2 * 1000; 599 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | 600 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); 601 lport->does_npiv = 1; 602 603 fc_lport_init_stats(lport); 604 605 /* lport fc_lport related configuration */ 606 fc_lport_config(lport); 607 608 /* offload related configuration */ 609 lport->crc_offload = 0; 610 lport->seq_offload = 0; 611 lport->lro_enabled = 0; 612 lport->lro_xid = 0; 613 lport->lso_max = 0; 614 615 return 0; 616 } 617 618 /** 619 * fcoe_netdev_features_change - Updates the lport's offload flags based 620 * on the LLD netdev's FCoE feature flags 621 */ 622 static void fcoe_netdev_features_change(struct fc_lport *lport, 623 struct net_device *netdev) 624 { 625 mutex_lock(&lport->lp_mutex); 626 627 if (netdev->features & NETIF_F_SG) 628 lport->sg_supp = 1; 629 else 630 lport->sg_supp = 0; 631 632 if (netdev->features & NETIF_F_FCOE_CRC) { 633 lport->crc_offload = 1; 634 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); 635 } else { 636 lport->crc_offload = 0; 637 } 638 639 if (netdev->features & NETIF_F_FSO) { 640 lport->seq_offload = 1; 641 lport->lso_max = netdev->gso_max_size; 642 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", 643 lport->lso_max); 644 } else { 645 lport->seq_offload = 0; 646 lport->lso_max = 0; 647 } 648 649 if (netdev->fcoe_ddp_xid) { 650 lport->lro_enabled = 1; 651 lport->lro_xid = netdev->fcoe_ddp_xid; 652 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", 653 lport->lro_xid); 654 } else { 655 lport->lro_enabled = 0; 656 lport->lro_xid = 0; 657 } 658 659 mutex_unlock(&lport->lp_mutex); 660 } 661 662 /** 663 * fcoe_netdev_config() - Set up net devive for SW FCoE 664 * @lport: The local port that is associated with the net device 665 * @netdev: The associated net device 666 * 667 * Must be called after fcoe_lport_config() as it will use local port mutex 668 * 669 * Returns: 0 for success 670 */ 671 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev) 672 { 673 u32 mfs; 674 u64 wwnn, wwpn; 675 struct fcoe_interface *fcoe; 676 struct fcoe_ctlr *ctlr; 677 struct fcoe_port *port; 678 679 /* Setup lport private data to point to fcoe softc */ 680 port = lport_priv(lport); 681 fcoe = port->priv; 682 ctlr = fcoe_to_ctlr(fcoe); 683 684 /* 685 * Determine max frame size based on underlying device and optional 686 * user-configured limit. If the MFS is too low, fcoe_link_ok() 687 * will return 0, so do this first. 688 */ 689 mfs = netdev->mtu; 690 if (netdev->features & NETIF_F_FCOE_MTU) { 691 mfs = FCOE_MTU; 692 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); 693 } 694 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); 695 if (fc_set_mfs(lport, mfs)) 696 return -EINVAL; 697 698 /* offload features support */ 699 fcoe_netdev_features_change(lport, netdev); 700 701 skb_queue_head_init(&port->fcoe_pending_queue); 702 port->fcoe_pending_queue_active = 0; 703 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); 704 705 fcoe_link_speed_update(lport); 706 707 if (!lport->vport) { 708 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN)) 709 wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0); 710 fc_set_wwnn(lport, wwnn); 711 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN)) 712 wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 713 2, 0); 714 fc_set_wwpn(lport, wwpn); 715 } 716 717 return 0; 718 } 719 720 /** 721 * fcoe_shost_config() - Set up the SCSI host associated with a local port 722 * @lport: The local port 723 * @dev: The device associated with the SCSI host 724 * 725 * Must be called after fcoe_lport_config() and fcoe_netdev_config() 726 * 727 * Returns: 0 for success 728 */ 729 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev) 730 { 731 int rc = 0; 732 733 /* lport scsi host config */ 734 lport->host->max_lun = FCOE_MAX_LUN; 735 lport->host->max_id = FCOE_MAX_FCP_TARGET; 736 lport->host->max_channel = 0; 737 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN; 738 739 if (lport->vport) 740 lport->host->transportt = fcoe_vport_scsi_transport; 741 else 742 lport->host->transportt = fcoe_nport_scsi_transport; 743 744 /* add the new host to the SCSI-ml */ 745 rc = scsi_add_host(lport->host, dev); 746 if (rc) { 747 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " 748 "error on scsi_add_host\n"); 749 return rc; 750 } 751 752 if (!lport->vport) 753 fc_host_max_npiv_vports(lport->host) = USHRT_MAX; 754 755 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 756 "%s v%s over %s", FCOE_NAME, FCOE_VERSION, 757 fcoe_netdev(lport)->name); 758 759 return 0; 760 } 761 762 763 /** 764 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE 765 * @lport: The local port that is associated with the net device 766 * @netdev: The associated net device 767 * 768 * Must be called after fcoe_shost_config() as it will use local port mutex 769 * 770 */ 771 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev) 772 { 773 struct fcoe_interface *fcoe; 774 struct fcoe_port *port; 775 struct net_device *realdev; 776 int rc; 777 778 port = lport_priv(lport); 779 fcoe = port->priv; 780 realdev = fcoe->realdev; 781 782 if (!realdev) 783 return; 784 785 /* No FDMI state m/c for NPIV ports */ 786 if (lport->vport) 787 return; 788 789 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) { 790 struct netdev_fcoe_hbainfo *fdmi; 791 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL); 792 if (!fdmi) 793 return; 794 795 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev, 796 fdmi); 797 if (rc) { 798 printk(KERN_INFO "fcoe: Failed to retrieve FDMI " 799 "information from netdev.\n"); 800 return; 801 } 802 803 snprintf(fc_host_serial_number(lport->host), 804 FC_SERIAL_NUMBER_SIZE, 805 "%s", 806 fdmi->serial_number); 807 snprintf(fc_host_manufacturer(lport->host), 808 FC_SERIAL_NUMBER_SIZE, 809 "%s", 810 fdmi->manufacturer); 811 snprintf(fc_host_model(lport->host), 812 FC_SYMBOLIC_NAME_SIZE, 813 "%s", 814 fdmi->model); 815 snprintf(fc_host_model_description(lport->host), 816 FC_SYMBOLIC_NAME_SIZE, 817 "%s", 818 fdmi->model_description); 819 snprintf(fc_host_hardware_version(lport->host), 820 FC_VERSION_STRING_SIZE, 821 "%s", 822 fdmi->hardware_version); 823 snprintf(fc_host_driver_version(lport->host), 824 FC_VERSION_STRING_SIZE, 825 "%s", 826 fdmi->driver_version); 827 snprintf(fc_host_optionrom_version(lport->host), 828 FC_VERSION_STRING_SIZE, 829 "%s", 830 fdmi->optionrom_version); 831 snprintf(fc_host_firmware_version(lport->host), 832 FC_VERSION_STRING_SIZE, 833 "%s", 834 fdmi->firmware_version); 835 836 /* Enable FDMI lport states */ 837 lport->fdmi_enabled = 1; 838 kfree(fdmi); 839 } else { 840 lport->fdmi_enabled = 0; 841 printk(KERN_INFO "fcoe: No FDMI support.\n"); 842 } 843 } 844 845 /** 846 * fcoe_oem_match() - The match routine for the offloaded exchange manager 847 * @fp: The I/O frame 848 * 849 * This routine will be associated with an exchange manager (EM). When 850 * the libfc exchange handling code is looking for an EM to use it will 851 * call this routine and pass it the frame that it wishes to send. This 852 * routine will return True if the associated EM is to be used and False 853 * if the echange code should continue looking for an EM. 854 * 855 * The offload EM that this routine is associated with will handle any 856 * packets that are for SCSI read requests. 857 * 858 * This has been enhanced to work when FCoE stack is operating in target 859 * mode. 860 * 861 * Returns: True for read types I/O, otherwise returns false. 862 */ 863 static bool fcoe_oem_match(struct fc_frame *fp) 864 { 865 struct fc_frame_header *fh = fc_frame_header_get(fp); 866 struct fcp_cmnd *fcp; 867 868 if (fc_fcp_is_read(fr_fsp(fp)) && 869 (fr_fsp(fp)->data_len > fcoe_ddp_min)) 870 return true; 871 else if ((fr_fsp(fp) == NULL) && 872 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) && 873 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { 874 fcp = fc_frame_payload_get(fp, sizeof(*fcp)); 875 if ((fcp->fc_flags & FCP_CFL_WRDATA) && 876 (ntohl(fcp->fc_dl) > fcoe_ddp_min)) 877 return true; 878 } 879 return false; 880 } 881 882 /** 883 * fcoe_em_config() - Allocate and configure an exchange manager 884 * @lport: The local port that the new EM will be associated with 885 * 886 * Returns: 0 on success 887 */ 888 static inline int fcoe_em_config(struct fc_lport *lport) 889 { 890 struct fcoe_port *port = lport_priv(lport); 891 struct fcoe_interface *fcoe = port->priv; 892 struct fcoe_interface *oldfcoe = NULL; 893 struct net_device *old_real_dev, *cur_real_dev; 894 u16 min_xid = FCOE_MIN_XID; 895 u16 max_xid = FCOE_MAX_XID; 896 897 /* 898 * Check if need to allocate an em instance for 899 * offload exchange ids to be shared across all VN_PORTs/lport. 900 */ 901 if (!lport->lro_enabled || !lport->lro_xid || 902 (lport->lro_xid >= max_xid)) { 903 lport->lro_xid = 0; 904 goto skip_oem; 905 } 906 907 /* 908 * Reuse existing offload em instance in case 909 * it is already allocated on real eth device 910 */ 911 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 912 cur_real_dev = vlan_dev_real_dev(fcoe->netdev); 913 else 914 cur_real_dev = fcoe->netdev; 915 916 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { 917 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 918 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); 919 else 920 old_real_dev = oldfcoe->netdev; 921 922 if (cur_real_dev == old_real_dev) { 923 fcoe->oem = oldfcoe->oem; 924 break; 925 } 926 } 927 928 if (fcoe->oem) { 929 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) { 930 printk(KERN_ERR "fcoe_em_config: failed to add " 931 "offload em:%p on interface:%s\n", 932 fcoe->oem, fcoe->netdev->name); 933 return -ENOMEM; 934 } 935 } else { 936 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3, 937 FCOE_MIN_XID, lport->lro_xid, 938 fcoe_oem_match); 939 if (!fcoe->oem) { 940 printk(KERN_ERR "fcoe_em_config: failed to allocate " 941 "em for offload exches on interface:%s\n", 942 fcoe->netdev->name); 943 return -ENOMEM; 944 } 945 } 946 947 /* 948 * Exclude offload EM xid range from next EM xid range. 949 */ 950 min_xid += lport->lro_xid + 1; 951 952 skip_oem: 953 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) { 954 printk(KERN_ERR "fcoe_em_config: failed to " 955 "allocate em on interface %s\n", fcoe->netdev->name); 956 return -ENOMEM; 957 } 958 959 return 0; 960 } 961 962 /** 963 * fcoe_if_destroy() - Tear down a SW FCoE instance 964 * @lport: The local port to be destroyed 965 * 966 */ 967 static void fcoe_if_destroy(struct fc_lport *lport) 968 { 969 struct fcoe_port *port = lport_priv(lport); 970 struct fcoe_interface *fcoe = port->priv; 971 struct net_device *netdev = fcoe->netdev; 972 973 FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); 974 975 /* Logout of the fabric */ 976 fc_fabric_logoff(lport); 977 978 /* Cleanup the fc_lport */ 979 fc_lport_destroy(lport); 980 981 /* Stop the transmit retry timer */ 982 del_timer_sync(&port->timer); 983 984 /* Free existing transmit skbs */ 985 fcoe_clean_pending_queue(lport); 986 987 rtnl_lock(); 988 if (!is_zero_ether_addr(port->data_src_addr)) 989 dev_uc_del(netdev, port->data_src_addr); 990 if (lport->vport) 991 synchronize_net(); 992 else 993 fcoe_interface_remove(fcoe); 994 rtnl_unlock(); 995 996 /* Free queued packets for the per-CPU receive threads */ 997 fcoe_percpu_clean(lport); 998 999 /* Detach from the scsi-ml */ 1000 fc_remove_host(lport->host); 1001 scsi_remove_host(lport->host); 1002 1003 /* Destroy lport scsi_priv */ 1004 fc_fcp_destroy(lport); 1005 1006 /* There are no more rports or I/O, free the EM */ 1007 fc_exch_mgr_free(lport); 1008 1009 /* Free memory used by statistical counters */ 1010 fc_lport_free_stats(lport); 1011 1012 /* 1013 * Release the Scsi_Host for vport but hold on to 1014 * master lport until it fcoe interface fully cleaned-up. 1015 */ 1016 if (lport->vport) 1017 scsi_host_put(lport->host); 1018 } 1019 1020 /** 1021 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device 1022 * @lport: The local port to setup DDP for 1023 * @xid: The exchange ID for this DDP transfer 1024 * @sgl: The scatterlist describing this transfer 1025 * @sgc: The number of sg items 1026 * 1027 * Returns: 0 if the DDP context was not configured 1028 */ 1029 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid, 1030 struct scatterlist *sgl, unsigned int sgc) 1031 { 1032 struct net_device *netdev = fcoe_netdev(lport); 1033 1034 if (netdev->netdev_ops->ndo_fcoe_ddp_setup) 1035 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev, 1036 xid, sgl, 1037 sgc); 1038 1039 return 0; 1040 } 1041 1042 /** 1043 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device 1044 * @lport: The local port to setup DDP for 1045 * @xid: The exchange ID for this DDP transfer 1046 * @sgl: The scatterlist describing this transfer 1047 * @sgc: The number of sg items 1048 * 1049 * Returns: 0 if the DDP context was not configured 1050 */ 1051 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid, 1052 struct scatterlist *sgl, unsigned int sgc) 1053 { 1054 struct net_device *netdev = fcoe_netdev(lport); 1055 1056 if (netdev->netdev_ops->ndo_fcoe_ddp_target) 1057 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid, 1058 sgl, sgc); 1059 1060 return 0; 1061 } 1062 1063 1064 /** 1065 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device 1066 * @lport: The local port to complete DDP on 1067 * @xid: The exchange ID for this DDP transfer 1068 * 1069 * Returns: the length of data that have been completed by DDP 1070 */ 1071 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid) 1072 { 1073 struct net_device *netdev = fcoe_netdev(lport); 1074 1075 if (netdev->netdev_ops->ndo_fcoe_ddp_done) 1076 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid); 1077 return 0; 1078 } 1079 1080 /** 1081 * fcoe_if_create() - Create a FCoE instance on an interface 1082 * @fcoe: The FCoE interface to create a local port on 1083 * @parent: The device pointer to be the parent in sysfs for the SCSI host 1084 * @npiv: Indicates if the port is a vport or not 1085 * 1086 * Creates a fc_lport instance and a Scsi_Host instance and configure them. 1087 * 1088 * Returns: The allocated fc_lport or an error pointer 1089 */ 1090 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, 1091 struct device *parent, int npiv) 1092 { 1093 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1094 struct net_device *netdev = fcoe->netdev; 1095 struct fc_lport *lport, *n_port; 1096 struct fcoe_port *port; 1097 struct Scsi_Host *shost; 1098 int rc; 1099 /* 1100 * parent is only a vport if npiv is 1, 1101 * but we'll only use vport in that case so go ahead and set it 1102 */ 1103 struct fc_vport *vport = dev_to_vport(parent); 1104 1105 FCOE_NETDEV_DBG(netdev, "Create Interface\n"); 1106 1107 if (!npiv) 1108 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port)); 1109 else 1110 lport = libfc_vport_create(vport, sizeof(*port)); 1111 1112 if (!lport) { 1113 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); 1114 rc = -ENOMEM; 1115 goto out; 1116 } 1117 port = lport_priv(lport); 1118 port->lport = lport; 1119 port->priv = fcoe; 1120 port->get_netdev = fcoe_netdev; 1121 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH; 1122 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH; 1123 INIT_WORK(&port->destroy_work, fcoe_destroy_work); 1124 1125 /* 1126 * Need to add the lport to the hostlist 1127 * so we catch NETDEV_CHANGE events. 1128 */ 1129 fcoe_hostlist_add(lport); 1130 1131 /* configure a fc_lport including the exchange manager */ 1132 rc = fcoe_lport_config(lport); 1133 if (rc) { 1134 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " 1135 "interface\n"); 1136 goto out_host_put; 1137 } 1138 1139 if (npiv) { 1140 FCOE_NETDEV_DBG(netdev, "Setting vport names, " 1141 "%16.16llx %16.16llx\n", 1142 vport->node_name, vport->port_name); 1143 fc_set_wwnn(lport, vport->node_name); 1144 fc_set_wwpn(lport, vport->port_name); 1145 } 1146 1147 /* configure lport network properties */ 1148 rc = fcoe_netdev_config(lport, netdev); 1149 if (rc) { 1150 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " 1151 "interface\n"); 1152 goto out_lp_destroy; 1153 } 1154 1155 /* configure lport scsi host properties */ 1156 rc = fcoe_shost_config(lport, parent); 1157 if (rc) { 1158 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " 1159 "interface\n"); 1160 goto out_lp_destroy; 1161 } 1162 1163 /* Initialize the library */ 1164 rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1); 1165 if (rc) { 1166 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " 1167 "interface\n"); 1168 goto out_lp_destroy; 1169 } 1170 1171 /* Initialized FDMI information */ 1172 fcoe_fdmi_info(lport, netdev); 1173 1174 /* 1175 * fcoe_em_alloc() and fcoe_hostlist_add() both 1176 * need to be atomic with respect to other changes to the 1177 * hostlist since fcoe_em_alloc() looks for an existing EM 1178 * instance on host list updated by fcoe_hostlist_add(). 1179 * 1180 * This is currently handled through the fcoe_config_mutex 1181 * begin held. 1182 */ 1183 if (!npiv) 1184 /* lport exch manager allocation */ 1185 rc = fcoe_em_config(lport); 1186 else { 1187 shost = vport_to_shost(vport); 1188 n_port = shost_priv(shost); 1189 rc = fc_exch_mgr_list_clone(n_port, lport); 1190 } 1191 1192 if (rc) { 1193 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n"); 1194 goto out_lp_destroy; 1195 } 1196 1197 return lport; 1198 1199 out_lp_destroy: 1200 fc_exch_mgr_free(lport); 1201 out_host_put: 1202 fcoe_hostlist_del(lport); 1203 scsi_host_put(lport->host); 1204 out: 1205 return ERR_PTR(rc); 1206 } 1207 1208 /** 1209 * fcoe_if_init() - Initialization routine for fcoe.ko 1210 * 1211 * Attaches the SW FCoE transport to the FC transport 1212 * 1213 * Returns: 0 on success 1214 */ 1215 static int __init fcoe_if_init(void) 1216 { 1217 /* attach to scsi transport */ 1218 fcoe_nport_scsi_transport = 1219 fc_attach_transport(&fcoe_nport_fc_functions); 1220 fcoe_vport_scsi_transport = 1221 fc_attach_transport(&fcoe_vport_fc_functions); 1222 1223 if (!fcoe_nport_scsi_transport) { 1224 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); 1225 return -ENODEV; 1226 } 1227 1228 return 0; 1229 } 1230 1231 /** 1232 * fcoe_if_exit() - Tear down fcoe.ko 1233 * 1234 * Detaches the SW FCoE transport from the FC transport 1235 * 1236 * Returns: 0 on success 1237 */ 1238 static int __exit fcoe_if_exit(void) 1239 { 1240 fc_release_transport(fcoe_nport_scsi_transport); 1241 fc_release_transport(fcoe_vport_scsi_transport); 1242 fcoe_nport_scsi_transport = NULL; 1243 fcoe_vport_scsi_transport = NULL; 1244 return 0; 1245 } 1246 1247 /** 1248 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU 1249 * @cpu: The CPU index of the CPU to create a receive thread for 1250 */ 1251 static void fcoe_percpu_thread_create(unsigned int cpu) 1252 { 1253 struct fcoe_percpu_s *p; 1254 struct task_struct *thread; 1255 1256 p = &per_cpu(fcoe_percpu, cpu); 1257 1258 thread = kthread_create_on_node(fcoe_percpu_receive_thread, 1259 (void *)p, cpu_to_node(cpu), 1260 "fcoethread/%d", cpu); 1261 1262 if (likely(!IS_ERR(thread))) { 1263 kthread_bind(thread, cpu); 1264 wake_up_process(thread); 1265 1266 spin_lock_bh(&p->fcoe_rx_list.lock); 1267 p->thread = thread; 1268 spin_unlock_bh(&p->fcoe_rx_list.lock); 1269 } 1270 } 1271 1272 /** 1273 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU 1274 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed 1275 * 1276 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the 1277 * current CPU's Rx thread. If the thread being destroyed is bound to 1278 * the CPU processing this context the skbs will be freed. 1279 */ 1280 static void fcoe_percpu_thread_destroy(unsigned int cpu) 1281 { 1282 struct fcoe_percpu_s *p; 1283 struct task_struct *thread; 1284 struct page *crc_eof; 1285 struct sk_buff *skb; 1286 #ifdef CONFIG_SMP 1287 struct fcoe_percpu_s *p0; 1288 unsigned targ_cpu = get_cpu(); 1289 #endif /* CONFIG_SMP */ 1290 1291 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); 1292 1293 /* Prevent any new skbs from being queued for this CPU. */ 1294 p = &per_cpu(fcoe_percpu, cpu); 1295 spin_lock_bh(&p->fcoe_rx_list.lock); 1296 thread = p->thread; 1297 p->thread = NULL; 1298 crc_eof = p->crc_eof_page; 1299 p->crc_eof_page = NULL; 1300 p->crc_eof_offset = 0; 1301 spin_unlock_bh(&p->fcoe_rx_list.lock); 1302 1303 #ifdef CONFIG_SMP 1304 /* 1305 * Don't bother moving the skb's if this context is running 1306 * on the same CPU that is having its thread destroyed. This 1307 * can easily happen when the module is removed. 1308 */ 1309 if (cpu != targ_cpu) { 1310 p0 = &per_cpu(fcoe_percpu, targ_cpu); 1311 spin_lock_bh(&p0->fcoe_rx_list.lock); 1312 if (p0->thread) { 1313 FCOE_DBG("Moving frames from CPU %d to CPU %d\n", 1314 cpu, targ_cpu); 1315 1316 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1317 __skb_queue_tail(&p0->fcoe_rx_list, skb); 1318 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1319 } else { 1320 /* 1321 * The targeted CPU is not initialized and cannot accept 1322 * new skbs. Unlock the targeted CPU and drop the skbs 1323 * on the CPU that is going offline. 1324 */ 1325 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1326 kfree_skb(skb); 1327 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1328 } 1329 } else { 1330 /* 1331 * This scenario occurs when the module is being removed 1332 * and all threads are being destroyed. skbs will continue 1333 * to be shifted from the CPU thread that is being removed 1334 * to the CPU thread associated with the CPU that is processing 1335 * the module removal. Once there is only one CPU Rx thread it 1336 * will reach this case and we will drop all skbs and later 1337 * stop the thread. 1338 */ 1339 spin_lock_bh(&p->fcoe_rx_list.lock); 1340 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1341 kfree_skb(skb); 1342 spin_unlock_bh(&p->fcoe_rx_list.lock); 1343 } 1344 put_cpu(); 1345 #else 1346 /* 1347 * This a non-SMP scenario where the singular Rx thread is 1348 * being removed. Free all skbs and stop the thread. 1349 */ 1350 spin_lock_bh(&p->fcoe_rx_list.lock); 1351 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1352 kfree_skb(skb); 1353 spin_unlock_bh(&p->fcoe_rx_list.lock); 1354 #endif 1355 1356 if (thread) 1357 kthread_stop(thread); 1358 1359 if (crc_eof) 1360 put_page(crc_eof); 1361 } 1362 1363 /** 1364 * fcoe_cpu_callback() - Handler for CPU hotplug events 1365 * @nfb: The callback data block 1366 * @action: The event triggering the callback 1367 * @hcpu: The index of the CPU that the event is for 1368 * 1369 * This creates or destroys per-CPU data for fcoe 1370 * 1371 * Returns NOTIFY_OK always. 1372 */ 1373 static int fcoe_cpu_callback(struct notifier_block *nfb, 1374 unsigned long action, void *hcpu) 1375 { 1376 unsigned cpu = (unsigned long)hcpu; 1377 1378 switch (action) { 1379 case CPU_ONLINE: 1380 case CPU_ONLINE_FROZEN: 1381 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); 1382 fcoe_percpu_thread_create(cpu); 1383 break; 1384 case CPU_DEAD: 1385 case CPU_DEAD_FROZEN: 1386 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); 1387 fcoe_percpu_thread_destroy(cpu); 1388 break; 1389 default: 1390 break; 1391 } 1392 return NOTIFY_OK; 1393 } 1394 1395 /** 1396 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming 1397 * command. 1398 * 1399 * This routine selects next CPU based on cpumask to distribute 1400 * incoming requests in round robin. 1401 * 1402 * Returns: int CPU number 1403 */ 1404 static inline unsigned int fcoe_select_cpu(void) 1405 { 1406 static unsigned int selected_cpu; 1407 1408 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); 1409 if (selected_cpu >= nr_cpu_ids) 1410 selected_cpu = cpumask_first(cpu_online_mask); 1411 1412 return selected_cpu; 1413 } 1414 1415 /** 1416 * fcoe_rcv() - Receive packets from a net device 1417 * @skb: The received packet 1418 * @netdev: The net device that the packet was received on 1419 * @ptype: The packet type context 1420 * @olddev: The last device net device 1421 * 1422 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a 1423 * FC frame and passes the frame to libfc. 1424 * 1425 * Returns: 0 for success 1426 */ 1427 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, 1428 struct packet_type *ptype, struct net_device *olddev) 1429 { 1430 struct fc_lport *lport; 1431 struct fcoe_rcv_info *fr; 1432 struct fcoe_ctlr *ctlr; 1433 struct fcoe_interface *fcoe; 1434 struct fc_frame_header *fh; 1435 struct fcoe_percpu_s *fps; 1436 struct ethhdr *eh; 1437 unsigned int cpu; 1438 1439 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); 1440 ctlr = fcoe_to_ctlr(fcoe); 1441 lport = ctlr->lp; 1442 if (unlikely(!lport)) { 1443 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure"); 1444 goto err2; 1445 } 1446 if (!lport->link_up) 1447 goto err2; 1448 1449 FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p " 1450 "data:%p tail:%p end:%p sum:%d dev:%s", 1451 skb->len, skb->data_len, skb->head, skb->data, 1452 skb_tail_pointer(skb), skb_end_pointer(skb), 1453 skb->csum, skb->dev ? skb->dev->name : "<NULL>"); 1454 1455 eh = eth_hdr(skb); 1456 1457 if (is_fip_mode(ctlr) && 1458 compare_ether_addr(eh->h_source, ctlr->dest_addr)) { 1459 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n", 1460 eh->h_source); 1461 goto err; 1462 } 1463 1464 /* 1465 * Check for minimum frame length, and make sure required FCoE 1466 * and FC headers are pulled into the linear data area. 1467 */ 1468 if (unlikely((skb->len < FCOE_MIN_FRAME) || 1469 !pskb_may_pull(skb, FCOE_HEADER_LEN))) 1470 goto err; 1471 1472 skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); 1473 fh = (struct fc_frame_header *) skb_transport_header(skb); 1474 1475 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) { 1476 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n", 1477 eh->h_dest); 1478 goto err; 1479 } 1480 1481 fr = fcoe_dev_from_skb(skb); 1482 fr->fr_dev = lport; 1483 1484 /* 1485 * In case the incoming frame's exchange is originated from 1486 * the initiator, then received frame's exchange id is ANDed 1487 * with fc_cpu_mask bits to get the same cpu on which exchange 1488 * was originated, otherwise select cpu using rx exchange id 1489 * or fcoe_select_cpu(). 1490 */ 1491 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) 1492 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; 1493 else { 1494 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN) 1495 cpu = fcoe_select_cpu(); 1496 else 1497 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask; 1498 } 1499 1500 if (cpu >= nr_cpu_ids) 1501 goto err; 1502 1503 fps = &per_cpu(fcoe_percpu, cpu); 1504 spin_lock(&fps->fcoe_rx_list.lock); 1505 if (unlikely(!fps->thread)) { 1506 /* 1507 * The targeted CPU is not ready, let's target 1508 * the first CPU now. For non-SMP systems this 1509 * will check the same CPU twice. 1510 */ 1511 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread " 1512 "ready for incoming skb- using first online " 1513 "CPU.\n"); 1514 1515 spin_unlock(&fps->fcoe_rx_list.lock); 1516 cpu = cpumask_first(cpu_online_mask); 1517 fps = &per_cpu(fcoe_percpu, cpu); 1518 spin_lock(&fps->fcoe_rx_list.lock); 1519 if (!fps->thread) { 1520 spin_unlock(&fps->fcoe_rx_list.lock); 1521 goto err; 1522 } 1523 } 1524 1525 /* 1526 * We now have a valid CPU that we're targeting for 1527 * this skb. We also have this receive thread locked, 1528 * so we're free to queue skbs into it's queue. 1529 */ 1530 1531 /* 1532 * Note: We used to have a set of conditions under which we would 1533 * call fcoe_recv_frame directly, rather than queuing to the rx list 1534 * as it could save a few cycles, but doing so is prohibited, as 1535 * fcoe_recv_frame has several paths that may sleep, which is forbidden 1536 * in softirq context. 1537 */ 1538 __skb_queue_tail(&fps->fcoe_rx_list, skb); 1539 if (fps->thread->state == TASK_INTERRUPTIBLE) 1540 wake_up_process(fps->thread); 1541 spin_unlock(&fps->fcoe_rx_list.lock); 1542 1543 return 0; 1544 err: 1545 per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++; 1546 put_cpu(); 1547 err2: 1548 kfree_skb(skb); 1549 return -1; 1550 } 1551 1552 /** 1553 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC 1554 * @skb: The packet to be transmitted 1555 * @tlen: The total length of the trailer 1556 * 1557 * Returns: 0 for success 1558 */ 1559 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) 1560 { 1561 struct fcoe_percpu_s *fps; 1562 int rc; 1563 1564 fps = &get_cpu_var(fcoe_percpu); 1565 rc = fcoe_get_paged_crc_eof(skb, tlen, fps); 1566 put_cpu_var(fcoe_percpu); 1567 1568 return rc; 1569 } 1570 1571 /** 1572 * fcoe_xmit() - Transmit a FCoE frame 1573 * @lport: The local port that the frame is to be transmitted for 1574 * @fp: The frame to be transmitted 1575 * 1576 * Return: 0 for success 1577 */ 1578 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp) 1579 { 1580 int wlen; 1581 u32 crc; 1582 struct ethhdr *eh; 1583 struct fcoe_crc_eof *cp; 1584 struct sk_buff *skb; 1585 struct fc_stats *stats; 1586 struct fc_frame_header *fh; 1587 unsigned int hlen; /* header length implies the version */ 1588 unsigned int tlen; /* trailer length */ 1589 unsigned int elen; /* eth header, may include vlan */ 1590 struct fcoe_port *port = lport_priv(lport); 1591 struct fcoe_interface *fcoe = port->priv; 1592 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1593 u8 sof, eof; 1594 struct fcoe_hdr *hp; 1595 1596 WARN_ON((fr_len(fp) % sizeof(u32)) != 0); 1597 1598 fh = fc_frame_header_get(fp); 1599 skb = fp_skb(fp); 1600 wlen = skb->len / FCOE_WORD_TO_BYTE; 1601 1602 if (!lport->link_up) { 1603 kfree_skb(skb); 1604 return 0; 1605 } 1606 1607 if (unlikely(fh->fh_type == FC_TYPE_ELS) && 1608 fcoe_ctlr_els_send(ctlr, lport, skb)) 1609 return 0; 1610 1611 sof = fr_sof(fp); 1612 eof = fr_eof(fp); 1613 1614 elen = sizeof(struct ethhdr); 1615 hlen = sizeof(struct fcoe_hdr); 1616 tlen = sizeof(struct fcoe_crc_eof); 1617 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; 1618 1619 /* crc offload */ 1620 if (likely(lport->crc_offload)) { 1621 skb->ip_summed = CHECKSUM_UNNECESSARY; 1622 skb->csum_start = skb_headroom(skb); 1623 skb->csum_offset = skb->len; 1624 crc = 0; 1625 } else { 1626 skb->ip_summed = CHECKSUM_NONE; 1627 crc = fcoe_fc_crc(fp); 1628 } 1629 1630 /* copy port crc and eof to the skb buff */ 1631 if (skb_is_nonlinear(skb)) { 1632 skb_frag_t *frag; 1633 if (fcoe_alloc_paged_crc_eof(skb, tlen)) { 1634 kfree_skb(skb); 1635 return -ENOMEM; 1636 } 1637 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; 1638 cp = kmap_atomic(skb_frag_page(frag)) 1639 + frag->page_offset; 1640 } else { 1641 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); 1642 } 1643 1644 memset(cp, 0, sizeof(*cp)); 1645 cp->fcoe_eof = eof; 1646 cp->fcoe_crc32 = cpu_to_le32(~crc); 1647 1648 if (skb_is_nonlinear(skb)) { 1649 kunmap_atomic(cp); 1650 cp = NULL; 1651 } 1652 1653 /* adjust skb network/transport offsets to match mac/fcoe/port */ 1654 skb_push(skb, elen + hlen); 1655 skb_reset_mac_header(skb); 1656 skb_reset_network_header(skb); 1657 skb->mac_len = elen; 1658 skb->protocol = htons(ETH_P_FCOE); 1659 skb->priority = fcoe->priority; 1660 1661 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN && 1662 fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) { 1663 /* must set skb->dev before calling vlan_put_tag */ 1664 skb->dev = fcoe->realdev; 1665 skb = __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 1666 vlan_dev_vlan_id(fcoe->netdev)); 1667 if (!skb) 1668 return -ENOMEM; 1669 } else 1670 skb->dev = fcoe->netdev; 1671 1672 /* fill up mac and fcoe headers */ 1673 eh = eth_hdr(skb); 1674 eh->h_proto = htons(ETH_P_FCOE); 1675 memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN); 1676 if (ctlr->map_dest) 1677 memcpy(eh->h_dest + 3, fh->fh_d_id, 3); 1678 1679 if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN)) 1680 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN); 1681 else 1682 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); 1683 1684 hp = (struct fcoe_hdr *)(eh + 1); 1685 memset(hp, 0, sizeof(*hp)); 1686 if (FC_FCOE_VER) 1687 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); 1688 hp->fcoe_sof = sof; 1689 1690 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ 1691 if (lport->seq_offload && fr_max_payload(fp)) { 1692 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; 1693 skb_shinfo(skb)->gso_size = fr_max_payload(fp); 1694 } else { 1695 skb_shinfo(skb)->gso_type = 0; 1696 skb_shinfo(skb)->gso_size = 0; 1697 } 1698 /* update tx stats: regardless if LLD fails */ 1699 stats = per_cpu_ptr(lport->stats, get_cpu()); 1700 stats->TxFrames++; 1701 stats->TxWords += wlen; 1702 put_cpu(); 1703 1704 /* send down to lld */ 1705 fr_dev(fp) = lport; 1706 fcoe_port_send(port, skb); 1707 return 0; 1708 } 1709 1710 /** 1711 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion 1712 * @skb: The completed skb (argument required by destructor) 1713 */ 1714 static void fcoe_percpu_flush_done(struct sk_buff *skb) 1715 { 1716 complete(&fcoe_flush_completion); 1717 } 1718 1719 /** 1720 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC 1721 * @lport: The local port the frame was received on 1722 * @fp: The received frame 1723 * 1724 * Return: 0 on passing filtering checks 1725 */ 1726 static inline int fcoe_filter_frames(struct fc_lport *lport, 1727 struct fc_frame *fp) 1728 { 1729 struct fcoe_ctlr *ctlr; 1730 struct fcoe_interface *fcoe; 1731 struct fc_frame_header *fh; 1732 struct sk_buff *skb = (struct sk_buff *)fp; 1733 struct fc_stats *stats; 1734 1735 /* 1736 * We only check CRC if no offload is available and if it is 1737 * it's solicited data, in which case, the FCP layer would 1738 * check it during the copy. 1739 */ 1740 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) 1741 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1742 else 1743 fr_flags(fp) |= FCPHF_CRC_UNCHECKED; 1744 1745 fh = (struct fc_frame_header *) skb_transport_header(skb); 1746 fh = fc_frame_header_get(fp); 1747 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP) 1748 return 0; 1749 1750 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv; 1751 ctlr = fcoe_to_ctlr(fcoe); 1752 if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO && 1753 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) { 1754 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n"); 1755 return -EINVAL; 1756 } 1757 1758 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) || 1759 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) { 1760 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1761 return 0; 1762 } 1763 1764 stats = per_cpu_ptr(lport->stats, get_cpu()); 1765 stats->InvalidCRCCount++; 1766 if (stats->InvalidCRCCount < 5) 1767 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); 1768 put_cpu(); 1769 return -EINVAL; 1770 } 1771 1772 /** 1773 * fcoe_recv_frame() - process a single received frame 1774 * @skb: frame to process 1775 */ 1776 static void fcoe_recv_frame(struct sk_buff *skb) 1777 { 1778 u32 fr_len; 1779 struct fc_lport *lport; 1780 struct fcoe_rcv_info *fr; 1781 struct fc_stats *stats; 1782 struct fcoe_crc_eof crc_eof; 1783 struct fc_frame *fp; 1784 struct fcoe_port *port; 1785 struct fcoe_hdr *hp; 1786 1787 fr = fcoe_dev_from_skb(skb); 1788 lport = fr->fr_dev; 1789 if (unlikely(!lport)) { 1790 if (skb->destructor != fcoe_percpu_flush_done) 1791 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb"); 1792 kfree_skb(skb); 1793 return; 1794 } 1795 1796 FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " 1797 "head:%p data:%p tail:%p end:%p sum:%d dev:%s", 1798 skb->len, skb->data_len, 1799 skb->head, skb->data, skb_tail_pointer(skb), 1800 skb_end_pointer(skb), skb->csum, 1801 skb->dev ? skb->dev->name : "<NULL>"); 1802 1803 port = lport_priv(lport); 1804 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */ 1805 1806 /* 1807 * Frame length checks and setting up the header pointers 1808 * was done in fcoe_rcv already. 1809 */ 1810 hp = (struct fcoe_hdr *) skb_network_header(skb); 1811 1812 stats = per_cpu_ptr(lport->stats, get_cpu()); 1813 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { 1814 if (stats->ErrorFrames < 5) 1815 printk(KERN_WARNING "fcoe: FCoE version " 1816 "mismatch: The frame has " 1817 "version %x, but the " 1818 "initiator supports version " 1819 "%x\n", FC_FCOE_DECAPS_VER(hp), 1820 FC_FCOE_VER); 1821 goto drop; 1822 } 1823 1824 skb_pull(skb, sizeof(struct fcoe_hdr)); 1825 fr_len = skb->len - sizeof(struct fcoe_crc_eof); 1826 1827 stats->RxFrames++; 1828 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; 1829 1830 fp = (struct fc_frame *)skb; 1831 fc_frame_init(fp); 1832 fr_dev(fp) = lport; 1833 fr_sof(fp) = hp->fcoe_sof; 1834 1835 /* Copy out the CRC and EOF trailer for access */ 1836 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) 1837 goto drop; 1838 fr_eof(fp) = crc_eof.fcoe_eof; 1839 fr_crc(fp) = crc_eof.fcoe_crc32; 1840 if (pskb_trim(skb, fr_len)) 1841 goto drop; 1842 1843 if (!fcoe_filter_frames(lport, fp)) { 1844 put_cpu(); 1845 fc_exch_recv(lport, fp); 1846 return; 1847 } 1848 drop: 1849 stats->ErrorFrames++; 1850 put_cpu(); 1851 kfree_skb(skb); 1852 } 1853 1854 /** 1855 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread 1856 * @arg: The per-CPU context 1857 * 1858 * Return: 0 for success 1859 */ 1860 static int fcoe_percpu_receive_thread(void *arg) 1861 { 1862 struct fcoe_percpu_s *p = arg; 1863 struct sk_buff *skb; 1864 struct sk_buff_head tmp; 1865 1866 skb_queue_head_init(&tmp); 1867 1868 set_user_nice(current, -20); 1869 1870 retry: 1871 while (!kthread_should_stop()) { 1872 1873 spin_lock_bh(&p->fcoe_rx_list.lock); 1874 skb_queue_splice_init(&p->fcoe_rx_list, &tmp); 1875 1876 if (!skb_queue_len(&tmp)) { 1877 set_current_state(TASK_INTERRUPTIBLE); 1878 spin_unlock_bh(&p->fcoe_rx_list.lock); 1879 schedule(); 1880 set_current_state(TASK_RUNNING); 1881 goto retry; 1882 } 1883 1884 spin_unlock_bh(&p->fcoe_rx_list.lock); 1885 1886 while ((skb = __skb_dequeue(&tmp)) != NULL) 1887 fcoe_recv_frame(skb); 1888 1889 } 1890 return 0; 1891 } 1892 1893 /** 1894 * fcoe_dev_setup() - Setup the link change notification interface 1895 */ 1896 static void fcoe_dev_setup(void) 1897 { 1898 register_dcbevent_notifier(&dcb_notifier); 1899 register_netdevice_notifier(&fcoe_notifier); 1900 } 1901 1902 /** 1903 * fcoe_dev_cleanup() - Cleanup the link change notification interface 1904 */ 1905 static void fcoe_dev_cleanup(void) 1906 { 1907 unregister_dcbevent_notifier(&dcb_notifier); 1908 unregister_netdevice_notifier(&fcoe_notifier); 1909 } 1910 1911 static struct fcoe_interface * 1912 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev) 1913 { 1914 struct fcoe_interface *fcoe; 1915 struct net_device *real_dev; 1916 1917 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1918 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 1919 real_dev = vlan_dev_real_dev(fcoe->netdev); 1920 else 1921 real_dev = fcoe->netdev; 1922 1923 if (netdev == real_dev) 1924 return fcoe; 1925 } 1926 return NULL; 1927 } 1928 1929 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 1930 ulong event, void *ptr) 1931 { 1932 struct dcb_app_type *entry = ptr; 1933 struct fcoe_ctlr *ctlr; 1934 struct fcoe_interface *fcoe; 1935 struct net_device *netdev; 1936 int prio; 1937 1938 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE) 1939 return NOTIFY_OK; 1940 1941 netdev = dev_get_by_index(&init_net, entry->ifindex); 1942 if (!netdev) 1943 return NOTIFY_OK; 1944 1945 fcoe = fcoe_hostlist_lookup_realdev_port(netdev); 1946 dev_put(netdev); 1947 if (!fcoe) 1948 return NOTIFY_OK; 1949 1950 ctlr = fcoe_to_ctlr(fcoe); 1951 1952 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE) 1953 prio = ffs(entry->app.priority) - 1; 1954 else 1955 prio = entry->app.priority; 1956 1957 if (prio < 0) 1958 return NOTIFY_OK; 1959 1960 if (entry->app.protocol == ETH_P_FIP || 1961 entry->app.protocol == ETH_P_FCOE) 1962 ctlr->priority = prio; 1963 1964 if (entry->app.protocol == ETH_P_FCOE) 1965 fcoe->priority = prio; 1966 1967 return NOTIFY_OK; 1968 } 1969 1970 /** 1971 * fcoe_device_notification() - Handler for net device events 1972 * @notifier: The context of the notification 1973 * @event: The type of event 1974 * @ptr: The net device that the event was on 1975 * 1976 * This function is called by the Ethernet driver in case of link change event. 1977 * 1978 * Returns: 0 for success 1979 */ 1980 static int fcoe_device_notification(struct notifier_block *notifier, 1981 ulong event, void *ptr) 1982 { 1983 struct fcoe_ctlr_device *cdev; 1984 struct fc_lport *lport = NULL; 1985 struct net_device *netdev = netdev_notifier_info_to_dev(ptr); 1986 struct fcoe_ctlr *ctlr; 1987 struct fcoe_interface *fcoe; 1988 struct fcoe_port *port; 1989 struct fc_stats *stats; 1990 u32 link_possible = 1; 1991 u32 mfs; 1992 int rc = NOTIFY_OK; 1993 1994 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1995 if (fcoe->netdev == netdev) { 1996 ctlr = fcoe_to_ctlr(fcoe); 1997 lport = ctlr->lp; 1998 break; 1999 } 2000 } 2001 if (!lport) { 2002 rc = NOTIFY_DONE; 2003 goto out; 2004 } 2005 2006 switch (event) { 2007 case NETDEV_DOWN: 2008 case NETDEV_GOING_DOWN: 2009 link_possible = 0; 2010 break; 2011 case NETDEV_UP: 2012 case NETDEV_CHANGE: 2013 break; 2014 case NETDEV_CHANGEMTU: 2015 if (netdev->features & NETIF_F_FCOE_MTU) 2016 break; 2017 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + 2018 sizeof(struct fcoe_crc_eof)); 2019 if (mfs >= FC_MIN_MAX_FRAME) 2020 fc_set_mfs(lport, mfs); 2021 break; 2022 case NETDEV_REGISTER: 2023 break; 2024 case NETDEV_UNREGISTER: 2025 list_del(&fcoe->list); 2026 port = lport_priv(ctlr->lp); 2027 queue_work(fcoe_wq, &port->destroy_work); 2028 goto out; 2029 break; 2030 case NETDEV_FEAT_CHANGE: 2031 fcoe_netdev_features_change(lport, netdev); 2032 break; 2033 default: 2034 FCOE_NETDEV_DBG(netdev, "Unknown event %ld " 2035 "from netdev netlink\n", event); 2036 } 2037 2038 fcoe_link_speed_update(lport); 2039 2040 cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2041 2042 if (link_possible && !fcoe_link_ok(lport)) { 2043 switch (cdev->enabled) { 2044 case FCOE_CTLR_DISABLED: 2045 pr_info("Link up while interface is disabled.\n"); 2046 break; 2047 case FCOE_CTLR_ENABLED: 2048 case FCOE_CTLR_UNUSED: 2049 fcoe_ctlr_link_up(ctlr); 2050 }; 2051 } else if (fcoe_ctlr_link_down(ctlr)) { 2052 switch (cdev->enabled) { 2053 case FCOE_CTLR_DISABLED: 2054 pr_info("Link down while interface is disabled.\n"); 2055 break; 2056 case FCOE_CTLR_ENABLED: 2057 case FCOE_CTLR_UNUSED: 2058 stats = per_cpu_ptr(lport->stats, get_cpu()); 2059 stats->LinkFailureCount++; 2060 put_cpu(); 2061 fcoe_clean_pending_queue(lport); 2062 }; 2063 } 2064 out: 2065 return rc; 2066 } 2067 2068 /** 2069 * fcoe_disable() - Disables a FCoE interface 2070 * @netdev : The net_device object the Ethernet interface to create on 2071 * 2072 * Called from fcoe transport. 2073 * 2074 * Returns: 0 for success 2075 * 2076 * Deprecated: use fcoe_ctlr_enabled() 2077 */ 2078 static int fcoe_disable(struct net_device *netdev) 2079 { 2080 struct fcoe_ctlr *ctlr; 2081 struct fcoe_interface *fcoe; 2082 int rc = 0; 2083 2084 mutex_lock(&fcoe_config_mutex); 2085 2086 rtnl_lock(); 2087 fcoe = fcoe_hostlist_lookup_port(netdev); 2088 rtnl_unlock(); 2089 2090 if (fcoe) { 2091 ctlr = fcoe_to_ctlr(fcoe); 2092 fcoe_ctlr_link_down(ctlr); 2093 fcoe_clean_pending_queue(ctlr->lp); 2094 } else 2095 rc = -ENODEV; 2096 2097 mutex_unlock(&fcoe_config_mutex); 2098 return rc; 2099 } 2100 2101 /** 2102 * fcoe_enable() - Enables a FCoE interface 2103 * @netdev : The net_device object the Ethernet interface to create on 2104 * 2105 * Called from fcoe transport. 2106 * 2107 * Returns: 0 for success 2108 */ 2109 static int fcoe_enable(struct net_device *netdev) 2110 { 2111 struct fcoe_ctlr *ctlr; 2112 struct fcoe_interface *fcoe; 2113 int rc = 0; 2114 2115 mutex_lock(&fcoe_config_mutex); 2116 rtnl_lock(); 2117 fcoe = fcoe_hostlist_lookup_port(netdev); 2118 rtnl_unlock(); 2119 2120 if (!fcoe) { 2121 rc = -ENODEV; 2122 goto out; 2123 } 2124 2125 ctlr = fcoe_to_ctlr(fcoe); 2126 2127 if (!fcoe_link_ok(ctlr->lp)) 2128 fcoe_ctlr_link_up(ctlr); 2129 2130 out: 2131 mutex_unlock(&fcoe_config_mutex); 2132 return rc; 2133 } 2134 2135 /** 2136 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller 2137 * @cdev: The FCoE Controller that is being enabled or disabled 2138 * 2139 * fcoe_sysfs will ensure that the state of 'enabled' has 2140 * changed, so no checking is necessary here. This routine simply 2141 * calls fcoe_enable or fcoe_disable, both of which are deprecated. 2142 * When those routines are removed the functionality can be merged 2143 * here. 2144 */ 2145 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev) 2146 { 2147 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev); 2148 struct fc_lport *lport = ctlr->lp; 2149 struct net_device *netdev = fcoe_netdev(lport); 2150 2151 switch (cdev->enabled) { 2152 case FCOE_CTLR_ENABLED: 2153 return fcoe_enable(netdev); 2154 case FCOE_CTLR_DISABLED: 2155 return fcoe_disable(netdev); 2156 case FCOE_CTLR_UNUSED: 2157 default: 2158 return -ENOTSUPP; 2159 }; 2160 } 2161 2162 /** 2163 * fcoe_destroy() - Destroy a FCoE interface 2164 * @netdev : The net_device object the Ethernet interface to create on 2165 * 2166 * Called from fcoe transport 2167 * 2168 * Returns: 0 for success 2169 */ 2170 static int fcoe_destroy(struct net_device *netdev) 2171 { 2172 struct fcoe_ctlr *ctlr; 2173 struct fcoe_interface *fcoe; 2174 struct fc_lport *lport; 2175 struct fcoe_port *port; 2176 int rc = 0; 2177 2178 mutex_lock(&fcoe_config_mutex); 2179 rtnl_lock(); 2180 fcoe = fcoe_hostlist_lookup_port(netdev); 2181 if (!fcoe) { 2182 rc = -ENODEV; 2183 goto out_nodev; 2184 } 2185 ctlr = fcoe_to_ctlr(fcoe); 2186 lport = ctlr->lp; 2187 port = lport_priv(lport); 2188 list_del(&fcoe->list); 2189 queue_work(fcoe_wq, &port->destroy_work); 2190 out_nodev: 2191 rtnl_unlock(); 2192 mutex_unlock(&fcoe_config_mutex); 2193 return rc; 2194 } 2195 2196 /** 2197 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context 2198 * @work: Handle to the FCoE port to be destroyed 2199 */ 2200 static void fcoe_destroy_work(struct work_struct *work) 2201 { 2202 struct fcoe_ctlr_device *cdev; 2203 struct fcoe_ctlr *ctlr; 2204 struct fcoe_port *port; 2205 struct fcoe_interface *fcoe; 2206 struct Scsi_Host *shost; 2207 struct fc_host_attrs *fc_host; 2208 unsigned long flags; 2209 struct fc_vport *vport; 2210 struct fc_vport *next_vport; 2211 2212 port = container_of(work, struct fcoe_port, destroy_work); 2213 shost = port->lport->host; 2214 fc_host = shost_to_fc_host(shost); 2215 2216 /* Loop through all the vports and mark them for deletion */ 2217 spin_lock_irqsave(shost->host_lock, flags); 2218 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) { 2219 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) { 2220 continue; 2221 } else { 2222 vport->flags |= FC_VPORT_DELETING; 2223 queue_work(fc_host_work_q(shost), 2224 &vport->vport_delete_work); 2225 } 2226 } 2227 spin_unlock_irqrestore(shost->host_lock, flags); 2228 2229 flush_workqueue(fc_host_work_q(shost)); 2230 2231 mutex_lock(&fcoe_config_mutex); 2232 2233 fcoe = port->priv; 2234 ctlr = fcoe_to_ctlr(fcoe); 2235 cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2236 2237 fcoe_if_destroy(port->lport); 2238 fcoe_interface_cleanup(fcoe); 2239 2240 mutex_unlock(&fcoe_config_mutex); 2241 2242 fcoe_ctlr_device_delete(cdev); 2243 } 2244 2245 /** 2246 * fcoe_match() - Check if the FCoE is supported on the given netdevice 2247 * @netdev : The net_device object the Ethernet interface to create on 2248 * 2249 * Called from fcoe transport. 2250 * 2251 * Returns: always returns true as this is the default FCoE transport, 2252 * i.e., support all netdevs. 2253 */ 2254 static bool fcoe_match(struct net_device *netdev) 2255 { 2256 return true; 2257 } 2258 2259 /** 2260 * fcoe_dcb_create() - Initialize DCB attributes and hooks 2261 * @netdev: The net_device object of the L2 link that should be queried 2262 * @port: The fcoe_port to bind FCoE APP priority with 2263 * @ 2264 */ 2265 static void fcoe_dcb_create(struct fcoe_interface *fcoe) 2266 { 2267 #ifdef CONFIG_DCB 2268 int dcbx; 2269 u8 fup, up; 2270 struct net_device *netdev = fcoe->realdev; 2271 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2272 struct dcb_app app = { 2273 .priority = 0, 2274 .protocol = ETH_P_FCOE 2275 }; 2276 2277 /* setup DCB priority attributes. */ 2278 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) { 2279 dcbx = netdev->dcbnl_ops->getdcbx(netdev); 2280 2281 if (dcbx & DCB_CAP_DCBX_VER_IEEE) { 2282 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE; 2283 up = dcb_ieee_getapp_mask(netdev, &app); 2284 app.protocol = ETH_P_FIP; 2285 fup = dcb_ieee_getapp_mask(netdev, &app); 2286 } else { 2287 app.selector = DCB_APP_IDTYPE_ETHTYPE; 2288 up = dcb_getapp(netdev, &app); 2289 app.protocol = ETH_P_FIP; 2290 fup = dcb_getapp(netdev, &app); 2291 } 2292 2293 fcoe->priority = ffs(up) ? ffs(up) - 1 : 0; 2294 ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority; 2295 } 2296 #endif 2297 } 2298 2299 enum fcoe_create_link_state { 2300 FCOE_CREATE_LINK_DOWN, 2301 FCOE_CREATE_LINK_UP, 2302 }; 2303 2304 /** 2305 * _fcoe_create() - (internal) Create a fcoe interface 2306 * @netdev : The net_device object the Ethernet interface to create on 2307 * @fip_mode: The FIP mode for this creation 2308 * @link_state: The ctlr link state on creation 2309 * 2310 * Called from either the libfcoe 'create' module parameter 2311 * via fcoe_create or from fcoe_syfs's ctlr_create file. 2312 * 2313 * libfcoe's 'create' module parameter is deprecated so some 2314 * consolidation of code can be done when that interface is 2315 * removed. 2316 */ 2317 static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode, 2318 enum fcoe_create_link_state link_state) 2319 { 2320 int rc = 0; 2321 struct fcoe_ctlr_device *ctlr_dev; 2322 struct fcoe_ctlr *ctlr; 2323 struct fcoe_interface *fcoe; 2324 struct fc_lport *lport; 2325 2326 mutex_lock(&fcoe_config_mutex); 2327 rtnl_lock(); 2328 2329 /* look for existing lport */ 2330 if (fcoe_hostlist_lookup(netdev)) { 2331 rc = -EEXIST; 2332 goto out_nodev; 2333 } 2334 2335 fcoe = fcoe_interface_create(netdev, fip_mode); 2336 if (IS_ERR(fcoe)) { 2337 rc = PTR_ERR(fcoe); 2338 goto out_nodev; 2339 } 2340 2341 ctlr = fcoe_to_ctlr(fcoe); 2342 ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr); 2343 lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0); 2344 if (IS_ERR(lport)) { 2345 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", 2346 netdev->name); 2347 rc = -EIO; 2348 rtnl_unlock(); 2349 fcoe_interface_cleanup(fcoe); 2350 mutex_unlock(&fcoe_config_mutex); 2351 fcoe_ctlr_device_delete(ctlr_dev); 2352 goto out; 2353 } 2354 2355 /* Make this the "master" N_Port */ 2356 ctlr->lp = lport; 2357 2358 /* setup DCB priority attributes. */ 2359 fcoe_dcb_create(fcoe); 2360 2361 /* start FIP Discovery and FLOGI */ 2362 lport->boot_time = jiffies; 2363 fc_fabric_login(lport); 2364 2365 /* 2366 * If the fcoe_ctlr_device is to be set to DISABLED 2367 * it must be done after the lport is added to the 2368 * hostlist, but before the rtnl_lock is released. 2369 * This is because the rtnl_lock protects the 2370 * hostlist that fcoe_device_notification uses. If 2371 * the FCoE Controller is intended to be created 2372 * DISABLED then 'enabled' needs to be considered 2373 * handling link events. 'enabled' must be set 2374 * before the lport can be found in the hostlist 2375 * when a link up event is received. 2376 */ 2377 if (link_state == FCOE_CREATE_LINK_UP) 2378 ctlr_dev->enabled = FCOE_CTLR_ENABLED; 2379 else 2380 ctlr_dev->enabled = FCOE_CTLR_DISABLED; 2381 2382 if (link_state == FCOE_CREATE_LINK_UP && 2383 !fcoe_link_ok(lport)) { 2384 rtnl_unlock(); 2385 fcoe_ctlr_link_up(ctlr); 2386 mutex_unlock(&fcoe_config_mutex); 2387 return rc; 2388 } 2389 2390 out_nodev: 2391 rtnl_unlock(); 2392 mutex_unlock(&fcoe_config_mutex); 2393 out: 2394 return rc; 2395 } 2396 2397 /** 2398 * fcoe_create() - Create a fcoe interface 2399 * @netdev : The net_device object the Ethernet interface to create on 2400 * @fip_mode: The FIP mode for this creation 2401 * 2402 * Called from fcoe transport 2403 * 2404 * Returns: 0 for success 2405 */ 2406 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode) 2407 { 2408 return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP); 2409 } 2410 2411 /** 2412 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs 2413 * @netdev: The net_device to be used by the allocated FCoE Controller 2414 * 2415 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr 2416 * in a link_down state. The allows the user an opportunity to configure 2417 * the FCoE Controller from sysfs before enabling the FCoE Controller. 2418 * 2419 * Creating in with this routine starts the FCoE Controller in Fabric 2420 * mode. The user can change to VN2VN or another mode before enabling. 2421 */ 2422 static int fcoe_ctlr_alloc(struct net_device *netdev) 2423 { 2424 return _fcoe_create(netdev, FIP_MODE_FABRIC, 2425 FCOE_CREATE_LINK_DOWN); 2426 } 2427 2428 /** 2429 * fcoe_link_ok() - Check if the link is OK for a local port 2430 * @lport: The local port to check link on 2431 * 2432 * Returns: 0 if link is UP and OK, -1 if not 2433 * 2434 */ 2435 static int fcoe_link_ok(struct fc_lport *lport) 2436 { 2437 struct net_device *netdev = fcoe_netdev(lport); 2438 2439 if (netif_oper_up(netdev)) 2440 return 0; 2441 return -1; 2442 } 2443 2444 /** 2445 * fcoe_percpu_clean() - Clear all pending skbs for an local port 2446 * @lport: The local port whose skbs are to be cleared 2447 * 2448 * Must be called with fcoe_create_mutex held to single-thread completion. 2449 * 2450 * This flushes the pending skbs by adding a new skb to each queue and 2451 * waiting until they are all freed. This assures us that not only are 2452 * there no packets that will be handled by the lport, but also that any 2453 * threads already handling packet have returned. 2454 */ 2455 static void fcoe_percpu_clean(struct fc_lport *lport) 2456 { 2457 struct fcoe_percpu_s *pp; 2458 struct sk_buff *skb; 2459 unsigned int cpu; 2460 2461 for_each_possible_cpu(cpu) { 2462 pp = &per_cpu(fcoe_percpu, cpu); 2463 2464 if (!pp->thread || !cpu_online(cpu)) 2465 continue; 2466 2467 skb = dev_alloc_skb(0); 2468 if (!skb) 2469 continue; 2470 2471 skb->destructor = fcoe_percpu_flush_done; 2472 2473 spin_lock_bh(&pp->fcoe_rx_list.lock); 2474 __skb_queue_tail(&pp->fcoe_rx_list, skb); 2475 if (pp->fcoe_rx_list.qlen == 1) 2476 wake_up_process(pp->thread); 2477 spin_unlock_bh(&pp->fcoe_rx_list.lock); 2478 2479 wait_for_completion(&fcoe_flush_completion); 2480 } 2481 } 2482 2483 /** 2484 * fcoe_reset() - Reset a local port 2485 * @shost: The SCSI host associated with the local port to be reset 2486 * 2487 * Returns: Always 0 (return value required by FC transport template) 2488 */ 2489 static int fcoe_reset(struct Scsi_Host *shost) 2490 { 2491 struct fc_lport *lport = shost_priv(shost); 2492 struct fcoe_port *port = lport_priv(lport); 2493 struct fcoe_interface *fcoe = port->priv; 2494 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2495 struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2496 2497 fcoe_ctlr_link_down(ctlr); 2498 fcoe_clean_pending_queue(ctlr->lp); 2499 2500 if (cdev->enabled != FCOE_CTLR_DISABLED && 2501 !fcoe_link_ok(ctlr->lp)) 2502 fcoe_ctlr_link_up(ctlr); 2503 return 0; 2504 } 2505 2506 /** 2507 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device 2508 * @netdev: The net device used as a key 2509 * 2510 * Locking: Must be called with the RNL mutex held. 2511 * 2512 * Returns: NULL or the FCoE interface 2513 */ 2514 static struct fcoe_interface * 2515 fcoe_hostlist_lookup_port(const struct net_device *netdev) 2516 { 2517 struct fcoe_interface *fcoe; 2518 2519 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 2520 if (fcoe->netdev == netdev) 2521 return fcoe; 2522 } 2523 return NULL; 2524 } 2525 2526 /** 2527 * fcoe_hostlist_lookup() - Find the local port associated with a 2528 * given net device 2529 * @netdev: The netdevice used as a key 2530 * 2531 * Locking: Must be called with the RTNL mutex held 2532 * 2533 * Returns: NULL or the local port 2534 */ 2535 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) 2536 { 2537 struct fcoe_ctlr *ctlr; 2538 struct fcoe_interface *fcoe; 2539 2540 fcoe = fcoe_hostlist_lookup_port(netdev); 2541 ctlr = fcoe_to_ctlr(fcoe); 2542 return (fcoe) ? ctlr->lp : NULL; 2543 } 2544 2545 /** 2546 * fcoe_hostlist_add() - Add the FCoE interface identified by a local 2547 * port to the hostlist 2548 * @lport: The local port that identifies the FCoE interface to be added 2549 * 2550 * Locking: must be called with the RTNL mutex held 2551 * 2552 * Returns: 0 for success 2553 */ 2554 static int fcoe_hostlist_add(const struct fc_lport *lport) 2555 { 2556 struct fcoe_interface *fcoe; 2557 struct fcoe_port *port; 2558 2559 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); 2560 if (!fcoe) { 2561 port = lport_priv(lport); 2562 fcoe = port->priv; 2563 list_add_tail(&fcoe->list, &fcoe_hostlist); 2564 } 2565 return 0; 2566 } 2567 2568 /** 2569 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local 2570 * port to the hostlist 2571 * @lport: The local port that identifies the FCoE interface to be added 2572 * 2573 * Locking: must be called with the RTNL mutex held 2574 * 2575 */ 2576 static void fcoe_hostlist_del(const struct fc_lport *lport) 2577 { 2578 struct fcoe_interface *fcoe; 2579 struct fcoe_port *port; 2580 2581 port = lport_priv(lport); 2582 fcoe = port->priv; 2583 list_del(&fcoe->list); 2584 return; 2585 } 2586 2587 static struct fcoe_transport fcoe_sw_transport = { 2588 .name = {FCOE_TRANSPORT_DEFAULT}, 2589 .attached = false, 2590 .list = LIST_HEAD_INIT(fcoe_sw_transport.list), 2591 .match = fcoe_match, 2592 .alloc = fcoe_ctlr_alloc, 2593 .create = fcoe_create, 2594 .destroy = fcoe_destroy, 2595 .enable = fcoe_enable, 2596 .disable = fcoe_disable, 2597 }; 2598 2599 /** 2600 * fcoe_init() - Initialize fcoe.ko 2601 * 2602 * Returns: 0 on success, or a negative value on failure 2603 */ 2604 static int __init fcoe_init(void) 2605 { 2606 struct fcoe_percpu_s *p; 2607 unsigned int cpu; 2608 int rc = 0; 2609 2610 fcoe_wq = alloc_workqueue("fcoe", 0, 0); 2611 if (!fcoe_wq) 2612 return -ENOMEM; 2613 2614 /* register as a fcoe transport */ 2615 rc = fcoe_transport_attach(&fcoe_sw_transport); 2616 if (rc) { 2617 printk(KERN_ERR "failed to register an fcoe transport, check " 2618 "if libfcoe is loaded\n"); 2619 return rc; 2620 } 2621 2622 mutex_lock(&fcoe_config_mutex); 2623 2624 for_each_possible_cpu(cpu) { 2625 p = &per_cpu(fcoe_percpu, cpu); 2626 skb_queue_head_init(&p->fcoe_rx_list); 2627 } 2628 2629 for_each_online_cpu(cpu) 2630 fcoe_percpu_thread_create(cpu); 2631 2632 /* Initialize per CPU interrupt thread */ 2633 rc = register_hotcpu_notifier(&fcoe_cpu_notifier); 2634 if (rc) 2635 goto out_free; 2636 2637 /* Setup link change notification */ 2638 fcoe_dev_setup(); 2639 2640 rc = fcoe_if_init(); 2641 if (rc) 2642 goto out_free; 2643 2644 mutex_unlock(&fcoe_config_mutex); 2645 return 0; 2646 2647 out_free: 2648 for_each_online_cpu(cpu) { 2649 fcoe_percpu_thread_destroy(cpu); 2650 } 2651 mutex_unlock(&fcoe_config_mutex); 2652 destroy_workqueue(fcoe_wq); 2653 return rc; 2654 } 2655 module_init(fcoe_init); 2656 2657 /** 2658 * fcoe_exit() - Clean up fcoe.ko 2659 * 2660 * Returns: 0 on success or a negative value on failure 2661 */ 2662 static void __exit fcoe_exit(void) 2663 { 2664 struct fcoe_interface *fcoe, *tmp; 2665 struct fcoe_ctlr *ctlr; 2666 struct fcoe_port *port; 2667 unsigned int cpu; 2668 2669 mutex_lock(&fcoe_config_mutex); 2670 2671 fcoe_dev_cleanup(); 2672 2673 /* releases the associated fcoe hosts */ 2674 rtnl_lock(); 2675 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) { 2676 ctlr = fcoe_to_ctlr(fcoe); 2677 port = lport_priv(ctlr->lp); 2678 fcoe_hostlist_del(port->lport); 2679 queue_work(fcoe_wq, &port->destroy_work); 2680 } 2681 rtnl_unlock(); 2682 2683 unregister_hotcpu_notifier(&fcoe_cpu_notifier); 2684 2685 for_each_online_cpu(cpu) 2686 fcoe_percpu_thread_destroy(cpu); 2687 2688 mutex_unlock(&fcoe_config_mutex); 2689 2690 /* 2691 * destroy_work's may be chained but destroy_workqueue() 2692 * can take care of them. Just kill the fcoe_wq. 2693 */ 2694 destroy_workqueue(fcoe_wq); 2695 2696 /* 2697 * Detaching from the scsi transport must happen after all 2698 * destroys are done on the fcoe_wq. destroy_workqueue will 2699 * enusre the fcoe_wq is flushed. 2700 */ 2701 fcoe_if_exit(); 2702 2703 /* detach from fcoe transport */ 2704 fcoe_transport_detach(&fcoe_sw_transport); 2705 } 2706 module_exit(fcoe_exit); 2707 2708 /** 2709 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler 2710 * @seq: active sequence in the FLOGI or FDISC exchange 2711 * @fp: response frame, or error encoded in a pointer (timeout) 2712 * @arg: pointer the the fcoe_ctlr structure 2713 * 2714 * This handles MAC address management for FCoE, then passes control on to 2715 * the libfc FLOGI response handler. 2716 */ 2717 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2718 { 2719 struct fcoe_ctlr *fip = arg; 2720 struct fc_exch *exch = fc_seq_exch(seq); 2721 struct fc_lport *lport = exch->lp; 2722 u8 *mac; 2723 2724 if (IS_ERR(fp)) 2725 goto done; 2726 2727 mac = fr_cb(fp)->granted_mac; 2728 /* pre-FIP */ 2729 if (is_zero_ether_addr(mac)) 2730 fcoe_ctlr_recv_flogi(fip, lport, fp); 2731 if (!is_zero_ether_addr(mac)) 2732 fcoe_update_src_mac(lport, mac); 2733 done: 2734 fc_lport_flogi_resp(seq, fp, lport); 2735 } 2736 2737 /** 2738 * fcoe_logo_resp() - FCoE specific LOGO response handler 2739 * @seq: active sequence in the LOGO exchange 2740 * @fp: response frame, or error encoded in a pointer (timeout) 2741 * @arg: pointer the the fcoe_ctlr structure 2742 * 2743 * This handles MAC address management for FCoE, then passes control on to 2744 * the libfc LOGO response handler. 2745 */ 2746 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2747 { 2748 struct fc_lport *lport = arg; 2749 static u8 zero_mac[ETH_ALEN] = { 0 }; 2750 2751 if (!IS_ERR(fp)) 2752 fcoe_update_src_mac(lport, zero_mac); 2753 fc_lport_logo_resp(seq, fp, lport); 2754 } 2755 2756 /** 2757 * fcoe_elsct_send - FCoE specific ELS handler 2758 * 2759 * This does special case handling of FIP encapsualted ELS exchanges for FCoE, 2760 * using FCoE specific response handlers and passing the FIP controller as 2761 * the argument (the lport is still available from the exchange). 2762 * 2763 * Most of the work here is just handed off to the libfc routine. 2764 */ 2765 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did, 2766 struct fc_frame *fp, unsigned int op, 2767 void (*resp)(struct fc_seq *, 2768 struct fc_frame *, 2769 void *), 2770 void *arg, u32 timeout) 2771 { 2772 struct fcoe_port *port = lport_priv(lport); 2773 struct fcoe_interface *fcoe = port->priv; 2774 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 2775 struct fc_frame_header *fh = fc_frame_header_get(fp); 2776 2777 switch (op) { 2778 case ELS_FLOGI: 2779 case ELS_FDISC: 2780 if (lport->point_to_multipoint) 2781 break; 2782 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, 2783 fip, timeout); 2784 case ELS_LOGO: 2785 /* only hook onto fabric logouts, not port logouts */ 2786 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) 2787 break; 2788 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, 2789 lport, timeout); 2790 } 2791 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); 2792 } 2793 2794 /** 2795 * fcoe_vport_create() - create an fc_host/scsi_host for a vport 2796 * @vport: fc_vport object to create a new fc_host for 2797 * @disabled: start the new fc_host in a disabled state by default? 2798 * 2799 * Returns: 0 for success 2800 */ 2801 static int fcoe_vport_create(struct fc_vport *vport, bool disabled) 2802 { 2803 struct Scsi_Host *shost = vport_to_shost(vport); 2804 struct fc_lport *n_port = shost_priv(shost); 2805 struct fcoe_port *port = lport_priv(n_port); 2806 struct fcoe_interface *fcoe = port->priv; 2807 struct net_device *netdev = fcoe->netdev; 2808 struct fc_lport *vn_port; 2809 int rc; 2810 char buf[32]; 2811 2812 rc = fcoe_validate_vport_create(vport); 2813 if (rc) { 2814 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf)); 2815 printk(KERN_ERR "fcoe: Failed to create vport, " 2816 "WWPN (0x%s) already exists\n", 2817 buf); 2818 return rc; 2819 } 2820 2821 mutex_lock(&fcoe_config_mutex); 2822 rtnl_lock(); 2823 vn_port = fcoe_if_create(fcoe, &vport->dev, 1); 2824 rtnl_unlock(); 2825 mutex_unlock(&fcoe_config_mutex); 2826 2827 if (IS_ERR(vn_port)) { 2828 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n", 2829 netdev->name); 2830 return -EIO; 2831 } 2832 2833 if (disabled) { 2834 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2835 } else { 2836 vn_port->boot_time = jiffies; 2837 fc_fabric_login(vn_port); 2838 fc_vport_setlink(vn_port); 2839 } 2840 return 0; 2841 } 2842 2843 /** 2844 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport 2845 * @vport: fc_vport object that is being destroyed 2846 * 2847 * Returns: 0 for success 2848 */ 2849 static int fcoe_vport_destroy(struct fc_vport *vport) 2850 { 2851 struct Scsi_Host *shost = vport_to_shost(vport); 2852 struct fc_lport *n_port = shost_priv(shost); 2853 struct fc_lport *vn_port = vport->dd_data; 2854 2855 mutex_lock(&n_port->lp_mutex); 2856 list_del(&vn_port->list); 2857 mutex_unlock(&n_port->lp_mutex); 2858 2859 mutex_lock(&fcoe_config_mutex); 2860 fcoe_if_destroy(vn_port); 2861 mutex_unlock(&fcoe_config_mutex); 2862 2863 return 0; 2864 } 2865 2866 /** 2867 * fcoe_vport_disable() - change vport state 2868 * @vport: vport to bring online/offline 2869 * @disable: should the vport be disabled? 2870 */ 2871 static int fcoe_vport_disable(struct fc_vport *vport, bool disable) 2872 { 2873 struct fc_lport *lport = vport->dd_data; 2874 2875 if (disable) { 2876 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2877 fc_fabric_logoff(lport); 2878 } else { 2879 lport->boot_time = jiffies; 2880 fc_fabric_login(lport); 2881 fc_vport_setlink(lport); 2882 } 2883 2884 return 0; 2885 } 2886 2887 /** 2888 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name 2889 * @vport: fc_vport with a new symbolic name string 2890 * 2891 * After generating a new symbolic name string, a new RSPN_ID request is 2892 * sent to the name server. There is no response handler, so if it fails 2893 * for some reason it will not be retried. 2894 */ 2895 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport) 2896 { 2897 struct fc_lport *lport = vport->dd_data; 2898 struct fc_frame *fp; 2899 size_t len; 2900 2901 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 2902 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION, 2903 fcoe_netdev(lport)->name, vport->symbolic_name); 2904 2905 if (lport->state != LPORT_ST_READY) 2906 return; 2907 2908 len = strnlen(fc_host_symbolic_name(lport->host), 255); 2909 fp = fc_frame_alloc(lport, 2910 sizeof(struct fc_ct_hdr) + 2911 sizeof(struct fc_ns_rspn) + len); 2912 if (!fp) 2913 return; 2914 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID, 2915 NULL, NULL, 3 * lport->r_a_tov); 2916 } 2917 2918 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev) 2919 { 2920 struct fcoe_ctlr_device *ctlr_dev = 2921 fcoe_fcf_dev_to_ctlr_dev(fcf_dev); 2922 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev); 2923 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr); 2924 2925 fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev); 2926 } 2927 2928 /** 2929 * fcoe_set_port_id() - Callback from libfc when Port_ID is set. 2930 * @lport: the local port 2931 * @port_id: the port ID 2932 * @fp: the received frame, if any, that caused the port_id to be set. 2933 * 2934 * This routine handles the case where we received a FLOGI and are 2935 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi() 2936 * so it can set the non-mapped mode and gateway address. 2937 * 2938 * The FLOGI LS_ACC is handled by fcoe_flogi_resp(). 2939 */ 2940 static void fcoe_set_port_id(struct fc_lport *lport, 2941 u32 port_id, struct fc_frame *fp) 2942 { 2943 struct fcoe_port *port = lport_priv(lport); 2944 struct fcoe_interface *fcoe = port->priv; 2945 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2946 2947 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI) 2948 fcoe_ctlr_recv_flogi(ctlr, lport, fp); 2949 } 2950