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 ctlr->cdev = ctlr_dev; 412 fcoe = fcoe_ctlr_priv(ctlr); 413 414 dev_hold(netdev); 415 416 /* 417 * Initialize FIP. 418 */ 419 fcoe_ctlr_init(ctlr, fip_mode); 420 ctlr->send = fcoe_fip_send; 421 ctlr->update_mac = fcoe_update_src_mac; 422 ctlr->get_src_addr = fcoe_get_src_mac; 423 424 err = fcoe_interface_setup(fcoe, netdev); 425 if (err) { 426 fcoe_ctlr_destroy(ctlr); 427 fcoe_ctlr_device_delete(ctlr_dev); 428 dev_put(netdev); 429 fcoe = ERR_PTR(err); 430 goto out_putmod; 431 } 432 433 goto out; 434 435 out_putmod: 436 module_put(THIS_MODULE); 437 out: 438 return fcoe; 439 } 440 441 /** 442 * fcoe_interface_remove() - remove FCoE interface from netdev 443 * @fcoe: The FCoE interface to be cleaned up 444 * 445 * Caller must be holding the RTNL mutex 446 */ 447 static void fcoe_interface_remove(struct fcoe_interface *fcoe) 448 { 449 struct net_device *netdev = fcoe->netdev; 450 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 451 u8 flogi_maddr[ETH_ALEN]; 452 const struct net_device_ops *ops; 453 454 /* 455 * Don't listen for Ethernet packets anymore. 456 * synchronize_net() ensures that the packet handlers are not running 457 * on another CPU. dev_remove_pack() would do that, this calls the 458 * unsyncronized version __dev_remove_pack() to avoid multiple delays. 459 */ 460 __dev_remove_pack(&fcoe->fcoe_packet_type); 461 __dev_remove_pack(&fcoe->fip_packet_type); 462 synchronize_net(); 463 464 /* Delete secondary MAC addresses */ 465 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 466 dev_uc_del(netdev, flogi_maddr); 467 if (fip->spma) 468 dev_uc_del(netdev, fip->ctl_src_addr); 469 if (fip->mode == FIP_MODE_VN2VN) { 470 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS); 471 dev_mc_del(netdev, FIP_ALL_P2P_MACS); 472 } else 473 dev_mc_del(netdev, FIP_ALL_ENODE_MACS); 474 475 /* Tell the LLD we are done w/ FCoE */ 476 ops = netdev->netdev_ops; 477 if (ops->ndo_fcoe_disable) { 478 if (ops->ndo_fcoe_disable(netdev)) 479 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" 480 " specific feature for LLD.\n"); 481 } 482 fcoe->removed = 1; 483 } 484 485 486 /** 487 * fcoe_interface_cleanup() - Clean up a FCoE interface 488 * @fcoe: The FCoE interface to be cleaned up 489 */ 490 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe) 491 { 492 struct net_device *netdev = fcoe->netdev; 493 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 494 495 rtnl_lock(); 496 if (!fcoe->removed) 497 fcoe_interface_remove(fcoe); 498 rtnl_unlock(); 499 500 /* Release the self-reference taken during fcoe_interface_create() */ 501 /* tear-down the FCoE controller */ 502 fcoe_ctlr_destroy(fip); 503 scsi_host_put(fip->lp->host); 504 dev_put(netdev); 505 module_put(THIS_MODULE); 506 } 507 508 /** 509 * fcoe_fip_recv() - Handler for received FIP frames 510 * @skb: The receive skb 511 * @netdev: The associated net device 512 * @ptype: The packet_type structure which was used to register this handler 513 * @orig_dev: The original net_device the the skb was received on. 514 * (in case dev is a bond) 515 * 516 * Returns: 0 for success 517 */ 518 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev, 519 struct packet_type *ptype, 520 struct net_device *orig_dev) 521 { 522 struct fcoe_interface *fcoe; 523 struct fcoe_ctlr *ctlr; 524 525 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); 526 ctlr = fcoe_to_ctlr(fcoe); 527 fcoe_ctlr_recv(ctlr, skb); 528 return 0; 529 } 530 531 /** 532 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame 533 * @port: The FCoE port 534 * @skb: The FIP/FCoE packet to be sent 535 */ 536 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb) 537 { 538 if (port->fcoe_pending_queue.qlen) 539 fcoe_check_wait_queue(port->lport, skb); 540 else if (fcoe_start_io(skb)) 541 fcoe_check_wait_queue(port->lport, skb); 542 } 543 544 /** 545 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame 546 * @fip: The FCoE controller 547 * @skb: The FIP packet to be sent 548 */ 549 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 550 { 551 skb->dev = fcoe_from_ctlr(fip)->netdev; 552 fcoe_port_send(lport_priv(fip->lp), skb); 553 } 554 555 /** 556 * fcoe_update_src_mac() - Update the Ethernet MAC filters 557 * @lport: The local port to update the source MAC on 558 * @addr: Unicast MAC address to add 559 * 560 * Remove any previously-set unicast MAC filter. 561 * Add secondary FCoE MAC address filter for our OUI. 562 */ 563 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) 564 { 565 struct fcoe_port *port = lport_priv(lport); 566 struct fcoe_interface *fcoe = port->priv; 567 568 if (!is_zero_ether_addr(port->data_src_addr)) 569 dev_uc_del(fcoe->netdev, port->data_src_addr); 570 if (!is_zero_ether_addr(addr)) 571 dev_uc_add(fcoe->netdev, addr); 572 memcpy(port->data_src_addr, addr, ETH_ALEN); 573 } 574 575 /** 576 * fcoe_get_src_mac() - return the Ethernet source address for an lport 577 * @lport: libfc lport 578 */ 579 static u8 *fcoe_get_src_mac(struct fc_lport *lport) 580 { 581 struct fcoe_port *port = lport_priv(lport); 582 583 return port->data_src_addr; 584 } 585 586 /** 587 * fcoe_lport_config() - Set up a local port 588 * @lport: The local port to be setup 589 * 590 * Returns: 0 for success 591 */ 592 static int fcoe_lport_config(struct fc_lport *lport) 593 { 594 lport->link_up = 0; 595 lport->qfull = 0; 596 lport->max_retry_count = 3; 597 lport->max_rport_retry_count = 3; 598 lport->e_d_tov = 2 * 1000; /* FC-FS default */ 599 lport->r_a_tov = 2 * 2 * 1000; 600 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | 601 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); 602 lport->does_npiv = 1; 603 604 fc_lport_init_stats(lport); 605 606 /* lport fc_lport related configuration */ 607 fc_lport_config(lport); 608 609 /* offload related configuration */ 610 lport->crc_offload = 0; 611 lport->seq_offload = 0; 612 lport->lro_enabled = 0; 613 lport->lro_xid = 0; 614 lport->lso_max = 0; 615 616 return 0; 617 } 618 619 /** 620 * fcoe_netdev_features_change - Updates the lport's offload flags based 621 * on the LLD netdev's FCoE feature flags 622 */ 623 static void fcoe_netdev_features_change(struct fc_lport *lport, 624 struct net_device *netdev) 625 { 626 mutex_lock(&lport->lp_mutex); 627 628 if (netdev->features & NETIF_F_SG) 629 lport->sg_supp = 1; 630 else 631 lport->sg_supp = 0; 632 633 if (netdev->features & NETIF_F_FCOE_CRC) { 634 lport->crc_offload = 1; 635 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); 636 } else { 637 lport->crc_offload = 0; 638 } 639 640 if (netdev->features & NETIF_F_FSO) { 641 lport->seq_offload = 1; 642 lport->lso_max = netdev->gso_max_size; 643 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", 644 lport->lso_max); 645 } else { 646 lport->seq_offload = 0; 647 lport->lso_max = 0; 648 } 649 650 if (netdev->fcoe_ddp_xid) { 651 lport->lro_enabled = 1; 652 lport->lro_xid = netdev->fcoe_ddp_xid; 653 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", 654 lport->lro_xid); 655 } else { 656 lport->lro_enabled = 0; 657 lport->lro_xid = 0; 658 } 659 660 mutex_unlock(&lport->lp_mutex); 661 } 662 663 /** 664 * fcoe_netdev_config() - Set up net devive for SW FCoE 665 * @lport: The local port that is associated with the net device 666 * @netdev: The associated net device 667 * 668 * Must be called after fcoe_lport_config() as it will use local port mutex 669 * 670 * Returns: 0 for success 671 */ 672 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev) 673 { 674 u32 mfs; 675 u64 wwnn, wwpn; 676 struct fcoe_interface *fcoe; 677 struct fcoe_ctlr *ctlr; 678 struct fcoe_port *port; 679 680 /* Setup lport private data to point to fcoe softc */ 681 port = lport_priv(lport); 682 fcoe = port->priv; 683 ctlr = fcoe_to_ctlr(fcoe); 684 685 /* 686 * Determine max frame size based on underlying device and optional 687 * user-configured limit. If the MFS is too low, fcoe_link_ok() 688 * will return 0, so do this first. 689 */ 690 mfs = netdev->mtu; 691 if (netdev->features & NETIF_F_FCOE_MTU) { 692 mfs = FCOE_MTU; 693 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); 694 } 695 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); 696 if (fc_set_mfs(lport, mfs)) 697 return -EINVAL; 698 699 /* offload features support */ 700 fcoe_netdev_features_change(lport, netdev); 701 702 skb_queue_head_init(&port->fcoe_pending_queue); 703 port->fcoe_pending_queue_active = 0; 704 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); 705 706 fcoe_link_speed_update(lport); 707 708 if (!lport->vport) { 709 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN)) 710 wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0); 711 fc_set_wwnn(lport, wwnn); 712 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN)) 713 wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 714 2, 0); 715 fc_set_wwpn(lport, wwpn); 716 } 717 718 return 0; 719 } 720 721 /** 722 * fcoe_shost_config() - Set up the SCSI host associated with a local port 723 * @lport: The local port 724 * @dev: The device associated with the SCSI host 725 * 726 * Must be called after fcoe_lport_config() and fcoe_netdev_config() 727 * 728 * Returns: 0 for success 729 */ 730 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev) 731 { 732 int rc = 0; 733 734 /* lport scsi host config */ 735 lport->host->max_lun = FCOE_MAX_LUN; 736 lport->host->max_id = FCOE_MAX_FCP_TARGET; 737 lport->host->max_channel = 0; 738 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN; 739 740 if (lport->vport) 741 lport->host->transportt = fcoe_vport_scsi_transport; 742 else 743 lport->host->transportt = fcoe_nport_scsi_transport; 744 745 /* add the new host to the SCSI-ml */ 746 rc = scsi_add_host(lport->host, dev); 747 if (rc) { 748 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " 749 "error on scsi_add_host\n"); 750 return rc; 751 } 752 753 if (!lport->vport) 754 fc_host_max_npiv_vports(lport->host) = USHRT_MAX; 755 756 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 757 "%s v%s over %s", FCOE_NAME, FCOE_VERSION, 758 fcoe_netdev(lport)->name); 759 760 return 0; 761 } 762 763 764 /** 765 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE 766 * @lport: The local port that is associated with the net device 767 * @netdev: The associated net device 768 * 769 * Must be called after fcoe_shost_config() as it will use local port mutex 770 * 771 */ 772 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev) 773 { 774 struct fcoe_interface *fcoe; 775 struct fcoe_port *port; 776 struct net_device *realdev; 777 int rc; 778 779 port = lport_priv(lport); 780 fcoe = port->priv; 781 realdev = fcoe->realdev; 782 783 if (!realdev) 784 return; 785 786 /* No FDMI state m/c for NPIV ports */ 787 if (lport->vport) 788 return; 789 790 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) { 791 struct netdev_fcoe_hbainfo *fdmi; 792 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL); 793 if (!fdmi) 794 return; 795 796 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev, 797 fdmi); 798 if (rc) { 799 printk(KERN_INFO "fcoe: Failed to retrieve FDMI " 800 "information from netdev.\n"); 801 return; 802 } 803 804 snprintf(fc_host_serial_number(lport->host), 805 FC_SERIAL_NUMBER_SIZE, 806 "%s", 807 fdmi->serial_number); 808 snprintf(fc_host_manufacturer(lport->host), 809 FC_SERIAL_NUMBER_SIZE, 810 "%s", 811 fdmi->manufacturer); 812 snprintf(fc_host_model(lport->host), 813 FC_SYMBOLIC_NAME_SIZE, 814 "%s", 815 fdmi->model); 816 snprintf(fc_host_model_description(lport->host), 817 FC_SYMBOLIC_NAME_SIZE, 818 "%s", 819 fdmi->model_description); 820 snprintf(fc_host_hardware_version(lport->host), 821 FC_VERSION_STRING_SIZE, 822 "%s", 823 fdmi->hardware_version); 824 snprintf(fc_host_driver_version(lport->host), 825 FC_VERSION_STRING_SIZE, 826 "%s", 827 fdmi->driver_version); 828 snprintf(fc_host_optionrom_version(lport->host), 829 FC_VERSION_STRING_SIZE, 830 "%s", 831 fdmi->optionrom_version); 832 snprintf(fc_host_firmware_version(lport->host), 833 FC_VERSION_STRING_SIZE, 834 "%s", 835 fdmi->firmware_version); 836 837 /* Enable FDMI lport states */ 838 lport->fdmi_enabled = 1; 839 kfree(fdmi); 840 } else { 841 lport->fdmi_enabled = 0; 842 printk(KERN_INFO "fcoe: No FDMI support.\n"); 843 } 844 } 845 846 /** 847 * fcoe_oem_match() - The match routine for the offloaded exchange manager 848 * @fp: The I/O frame 849 * 850 * This routine will be associated with an exchange manager (EM). When 851 * the libfc exchange handling code is looking for an EM to use it will 852 * call this routine and pass it the frame that it wishes to send. This 853 * routine will return True if the associated EM is to be used and False 854 * if the echange code should continue looking for an EM. 855 * 856 * The offload EM that this routine is associated with will handle any 857 * packets that are for SCSI read requests. 858 * 859 * This has been enhanced to work when FCoE stack is operating in target 860 * mode. 861 * 862 * Returns: True for read types I/O, otherwise returns false. 863 */ 864 static bool fcoe_oem_match(struct fc_frame *fp) 865 { 866 struct fc_frame_header *fh = fc_frame_header_get(fp); 867 struct fcp_cmnd *fcp; 868 869 if (fc_fcp_is_read(fr_fsp(fp)) && 870 (fr_fsp(fp)->data_len > fcoe_ddp_min)) 871 return true; 872 else if ((fr_fsp(fp) == NULL) && 873 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) && 874 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { 875 fcp = fc_frame_payload_get(fp, sizeof(*fcp)); 876 if ((fcp->fc_flags & FCP_CFL_WRDATA) && 877 (ntohl(fcp->fc_dl) > fcoe_ddp_min)) 878 return true; 879 } 880 return false; 881 } 882 883 /** 884 * fcoe_em_config() - Allocate and configure an exchange manager 885 * @lport: The local port that the new EM will be associated with 886 * 887 * Returns: 0 on success 888 */ 889 static inline int fcoe_em_config(struct fc_lport *lport) 890 { 891 struct fcoe_port *port = lport_priv(lport); 892 struct fcoe_interface *fcoe = port->priv; 893 struct fcoe_interface *oldfcoe = NULL; 894 struct net_device *old_real_dev, *cur_real_dev; 895 u16 min_xid = FCOE_MIN_XID; 896 u16 max_xid = FCOE_MAX_XID; 897 898 /* 899 * Check if need to allocate an em instance for 900 * offload exchange ids to be shared across all VN_PORTs/lport. 901 */ 902 if (!lport->lro_enabled || !lport->lro_xid || 903 (lport->lro_xid >= max_xid)) { 904 lport->lro_xid = 0; 905 goto skip_oem; 906 } 907 908 /* 909 * Reuse existing offload em instance in case 910 * it is already allocated on real eth device 911 */ 912 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 913 cur_real_dev = vlan_dev_real_dev(fcoe->netdev); 914 else 915 cur_real_dev = fcoe->netdev; 916 917 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { 918 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 919 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); 920 else 921 old_real_dev = oldfcoe->netdev; 922 923 if (cur_real_dev == old_real_dev) { 924 fcoe->oem = oldfcoe->oem; 925 break; 926 } 927 } 928 929 if (fcoe->oem) { 930 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) { 931 printk(KERN_ERR "fcoe_em_config: failed to add " 932 "offload em:%p on interface:%s\n", 933 fcoe->oem, fcoe->netdev->name); 934 return -ENOMEM; 935 } 936 } else { 937 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3, 938 FCOE_MIN_XID, lport->lro_xid, 939 fcoe_oem_match); 940 if (!fcoe->oem) { 941 printk(KERN_ERR "fcoe_em_config: failed to allocate " 942 "em for offload exches on interface:%s\n", 943 fcoe->netdev->name); 944 return -ENOMEM; 945 } 946 } 947 948 /* 949 * Exclude offload EM xid range from next EM xid range. 950 */ 951 min_xid += lport->lro_xid + 1; 952 953 skip_oem: 954 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) { 955 printk(KERN_ERR "fcoe_em_config: failed to " 956 "allocate em on interface %s\n", fcoe->netdev->name); 957 return -ENOMEM; 958 } 959 960 return 0; 961 } 962 963 /** 964 * fcoe_if_destroy() - Tear down a SW FCoE instance 965 * @lport: The local port to be destroyed 966 * 967 */ 968 static void fcoe_if_destroy(struct fc_lport *lport) 969 { 970 struct fcoe_port *port = lport_priv(lport); 971 struct fcoe_interface *fcoe = port->priv; 972 struct net_device *netdev = fcoe->netdev; 973 974 FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); 975 976 /* Logout of the fabric */ 977 fc_fabric_logoff(lport); 978 979 /* Cleanup the fc_lport */ 980 fc_lport_destroy(lport); 981 982 /* Stop the transmit retry timer */ 983 del_timer_sync(&port->timer); 984 985 /* Free existing transmit skbs */ 986 fcoe_clean_pending_queue(lport); 987 988 rtnl_lock(); 989 if (!is_zero_ether_addr(port->data_src_addr)) 990 dev_uc_del(netdev, port->data_src_addr); 991 if (lport->vport) 992 synchronize_net(); 993 else 994 fcoe_interface_remove(fcoe); 995 rtnl_unlock(); 996 997 /* Free queued packets for the per-CPU receive threads */ 998 fcoe_percpu_clean(lport); 999 1000 /* Detach from the scsi-ml */ 1001 fc_remove_host(lport->host); 1002 scsi_remove_host(lport->host); 1003 1004 /* Destroy lport scsi_priv */ 1005 fc_fcp_destroy(lport); 1006 1007 /* There are no more rports or I/O, free the EM */ 1008 fc_exch_mgr_free(lport); 1009 1010 /* Free memory used by statistical counters */ 1011 fc_lport_free_stats(lport); 1012 1013 /* 1014 * Release the Scsi_Host for vport but hold on to 1015 * master lport until it fcoe interface fully cleaned-up. 1016 */ 1017 if (lport->vport) 1018 scsi_host_put(lport->host); 1019 } 1020 1021 /** 1022 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device 1023 * @lport: The local port to setup DDP for 1024 * @xid: The exchange ID for this DDP transfer 1025 * @sgl: The scatterlist describing this transfer 1026 * @sgc: The number of sg items 1027 * 1028 * Returns: 0 if the DDP context was not configured 1029 */ 1030 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid, 1031 struct scatterlist *sgl, unsigned int sgc) 1032 { 1033 struct net_device *netdev = fcoe_netdev(lport); 1034 1035 if (netdev->netdev_ops->ndo_fcoe_ddp_setup) 1036 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev, 1037 xid, sgl, 1038 sgc); 1039 1040 return 0; 1041 } 1042 1043 /** 1044 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device 1045 * @lport: The local port to setup DDP for 1046 * @xid: The exchange ID for this DDP transfer 1047 * @sgl: The scatterlist describing this transfer 1048 * @sgc: The number of sg items 1049 * 1050 * Returns: 0 if the DDP context was not configured 1051 */ 1052 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid, 1053 struct scatterlist *sgl, unsigned int sgc) 1054 { 1055 struct net_device *netdev = fcoe_netdev(lport); 1056 1057 if (netdev->netdev_ops->ndo_fcoe_ddp_target) 1058 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid, 1059 sgl, sgc); 1060 1061 return 0; 1062 } 1063 1064 1065 /** 1066 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device 1067 * @lport: The local port to complete DDP on 1068 * @xid: The exchange ID for this DDP transfer 1069 * 1070 * Returns: the length of data that have been completed by DDP 1071 */ 1072 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid) 1073 { 1074 struct net_device *netdev = fcoe_netdev(lport); 1075 1076 if (netdev->netdev_ops->ndo_fcoe_ddp_done) 1077 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid); 1078 return 0; 1079 } 1080 1081 /** 1082 * fcoe_if_create() - Create a FCoE instance on an interface 1083 * @fcoe: The FCoE interface to create a local port on 1084 * @parent: The device pointer to be the parent in sysfs for the SCSI host 1085 * @npiv: Indicates if the port is a vport or not 1086 * 1087 * Creates a fc_lport instance and a Scsi_Host instance and configure them. 1088 * 1089 * Returns: The allocated fc_lport or an error pointer 1090 */ 1091 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, 1092 struct device *parent, int npiv) 1093 { 1094 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1095 struct net_device *netdev = fcoe->netdev; 1096 struct fc_lport *lport, *n_port; 1097 struct fcoe_port *port; 1098 struct Scsi_Host *shost; 1099 int rc; 1100 /* 1101 * parent is only a vport if npiv is 1, 1102 * but we'll only use vport in that case so go ahead and set it 1103 */ 1104 struct fc_vport *vport = dev_to_vport(parent); 1105 1106 FCOE_NETDEV_DBG(netdev, "Create Interface\n"); 1107 1108 if (!npiv) 1109 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port)); 1110 else 1111 lport = libfc_vport_create(vport, sizeof(*port)); 1112 1113 if (!lport) { 1114 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); 1115 rc = -ENOMEM; 1116 goto out; 1117 } 1118 port = lport_priv(lport); 1119 port->lport = lport; 1120 port->priv = fcoe; 1121 port->get_netdev = fcoe_netdev; 1122 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH; 1123 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH; 1124 INIT_WORK(&port->destroy_work, fcoe_destroy_work); 1125 1126 /* 1127 * Need to add the lport to the hostlist 1128 * so we catch NETDEV_CHANGE events. 1129 */ 1130 fcoe_hostlist_add(lport); 1131 1132 /* configure a fc_lport including the exchange manager */ 1133 rc = fcoe_lport_config(lport); 1134 if (rc) { 1135 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " 1136 "interface\n"); 1137 goto out_host_put; 1138 } 1139 1140 if (npiv) { 1141 FCOE_NETDEV_DBG(netdev, "Setting vport names, " 1142 "%16.16llx %16.16llx\n", 1143 vport->node_name, vport->port_name); 1144 fc_set_wwnn(lport, vport->node_name); 1145 fc_set_wwpn(lport, vport->port_name); 1146 } 1147 1148 /* configure lport network properties */ 1149 rc = fcoe_netdev_config(lport, netdev); 1150 if (rc) { 1151 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " 1152 "interface\n"); 1153 goto out_lp_destroy; 1154 } 1155 1156 /* configure lport scsi host properties */ 1157 rc = fcoe_shost_config(lport, parent); 1158 if (rc) { 1159 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " 1160 "interface\n"); 1161 goto out_lp_destroy; 1162 } 1163 1164 /* Initialize the library */ 1165 rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1); 1166 if (rc) { 1167 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " 1168 "interface\n"); 1169 goto out_lp_destroy; 1170 } 1171 1172 /* Initialized FDMI information */ 1173 fcoe_fdmi_info(lport, netdev); 1174 1175 /* 1176 * fcoe_em_alloc() and fcoe_hostlist_add() both 1177 * need to be atomic with respect to other changes to the 1178 * hostlist since fcoe_em_alloc() looks for an existing EM 1179 * instance on host list updated by fcoe_hostlist_add(). 1180 * 1181 * This is currently handled through the fcoe_config_mutex 1182 * begin held. 1183 */ 1184 if (!npiv) 1185 /* lport exch manager allocation */ 1186 rc = fcoe_em_config(lport); 1187 else { 1188 shost = vport_to_shost(vport); 1189 n_port = shost_priv(shost); 1190 rc = fc_exch_mgr_list_clone(n_port, lport); 1191 } 1192 1193 if (rc) { 1194 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n"); 1195 goto out_lp_destroy; 1196 } 1197 1198 return lport; 1199 1200 out_lp_destroy: 1201 fc_exch_mgr_free(lport); 1202 out_host_put: 1203 fcoe_hostlist_del(lport); 1204 scsi_host_put(lport->host); 1205 out: 1206 return ERR_PTR(rc); 1207 } 1208 1209 /** 1210 * fcoe_if_init() - Initialization routine for fcoe.ko 1211 * 1212 * Attaches the SW FCoE transport to the FC transport 1213 * 1214 * Returns: 0 on success 1215 */ 1216 static int __init fcoe_if_init(void) 1217 { 1218 /* attach to scsi transport */ 1219 fcoe_nport_scsi_transport = 1220 fc_attach_transport(&fcoe_nport_fc_functions); 1221 fcoe_vport_scsi_transport = 1222 fc_attach_transport(&fcoe_vport_fc_functions); 1223 1224 if (!fcoe_nport_scsi_transport) { 1225 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); 1226 return -ENODEV; 1227 } 1228 1229 return 0; 1230 } 1231 1232 /** 1233 * fcoe_if_exit() - Tear down fcoe.ko 1234 * 1235 * Detaches the SW FCoE transport from the FC transport 1236 * 1237 * Returns: 0 on success 1238 */ 1239 static int __exit fcoe_if_exit(void) 1240 { 1241 fc_release_transport(fcoe_nport_scsi_transport); 1242 fc_release_transport(fcoe_vport_scsi_transport); 1243 fcoe_nport_scsi_transport = NULL; 1244 fcoe_vport_scsi_transport = NULL; 1245 return 0; 1246 } 1247 1248 /** 1249 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU 1250 * @cpu: The CPU index of the CPU to create a receive thread for 1251 */ 1252 static void fcoe_percpu_thread_create(unsigned int cpu) 1253 { 1254 struct fcoe_percpu_s *p; 1255 struct task_struct *thread; 1256 1257 p = &per_cpu(fcoe_percpu, cpu); 1258 1259 thread = kthread_create_on_node(fcoe_percpu_receive_thread, 1260 (void *)p, cpu_to_node(cpu), 1261 "fcoethread/%d", cpu); 1262 1263 if (likely(!IS_ERR(thread))) { 1264 kthread_bind(thread, cpu); 1265 wake_up_process(thread); 1266 1267 spin_lock_bh(&p->fcoe_rx_list.lock); 1268 p->thread = thread; 1269 spin_unlock_bh(&p->fcoe_rx_list.lock); 1270 } 1271 } 1272 1273 /** 1274 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU 1275 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed 1276 * 1277 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the 1278 * current CPU's Rx thread. If the thread being destroyed is bound to 1279 * the CPU processing this context the skbs will be freed. 1280 */ 1281 static void fcoe_percpu_thread_destroy(unsigned int cpu) 1282 { 1283 struct fcoe_percpu_s *p; 1284 struct task_struct *thread; 1285 struct page *crc_eof; 1286 struct sk_buff *skb; 1287 #ifdef CONFIG_SMP 1288 struct fcoe_percpu_s *p0; 1289 unsigned targ_cpu = get_cpu(); 1290 #endif /* CONFIG_SMP */ 1291 1292 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); 1293 1294 /* Prevent any new skbs from being queued for this CPU. */ 1295 p = &per_cpu(fcoe_percpu, cpu); 1296 spin_lock_bh(&p->fcoe_rx_list.lock); 1297 thread = p->thread; 1298 p->thread = NULL; 1299 crc_eof = p->crc_eof_page; 1300 p->crc_eof_page = NULL; 1301 p->crc_eof_offset = 0; 1302 spin_unlock_bh(&p->fcoe_rx_list.lock); 1303 1304 #ifdef CONFIG_SMP 1305 /* 1306 * Don't bother moving the skb's if this context is running 1307 * on the same CPU that is having its thread destroyed. This 1308 * can easily happen when the module is removed. 1309 */ 1310 if (cpu != targ_cpu) { 1311 p0 = &per_cpu(fcoe_percpu, targ_cpu); 1312 spin_lock_bh(&p0->fcoe_rx_list.lock); 1313 if (p0->thread) { 1314 FCOE_DBG("Moving frames from CPU %d to CPU %d\n", 1315 cpu, targ_cpu); 1316 1317 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1318 __skb_queue_tail(&p0->fcoe_rx_list, skb); 1319 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1320 } else { 1321 /* 1322 * The targeted CPU is not initialized and cannot accept 1323 * new skbs. Unlock the targeted CPU and drop the skbs 1324 * on the CPU that is going offline. 1325 */ 1326 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1327 kfree_skb(skb); 1328 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1329 } 1330 } else { 1331 /* 1332 * This scenario occurs when the module is being removed 1333 * and all threads are being destroyed. skbs will continue 1334 * to be shifted from the CPU thread that is being removed 1335 * to the CPU thread associated with the CPU that is processing 1336 * the module removal. Once there is only one CPU Rx thread it 1337 * will reach this case and we will drop all skbs and later 1338 * stop the thread. 1339 */ 1340 spin_lock_bh(&p->fcoe_rx_list.lock); 1341 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1342 kfree_skb(skb); 1343 spin_unlock_bh(&p->fcoe_rx_list.lock); 1344 } 1345 put_cpu(); 1346 #else 1347 /* 1348 * This a non-SMP scenario where the singular Rx thread is 1349 * being removed. Free all skbs and stop the thread. 1350 */ 1351 spin_lock_bh(&p->fcoe_rx_list.lock); 1352 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1353 kfree_skb(skb); 1354 spin_unlock_bh(&p->fcoe_rx_list.lock); 1355 #endif 1356 1357 if (thread) 1358 kthread_stop(thread); 1359 1360 if (crc_eof) 1361 put_page(crc_eof); 1362 } 1363 1364 /** 1365 * fcoe_cpu_callback() - Handler for CPU hotplug events 1366 * @nfb: The callback data block 1367 * @action: The event triggering the callback 1368 * @hcpu: The index of the CPU that the event is for 1369 * 1370 * This creates or destroys per-CPU data for fcoe 1371 * 1372 * Returns NOTIFY_OK always. 1373 */ 1374 static int fcoe_cpu_callback(struct notifier_block *nfb, 1375 unsigned long action, void *hcpu) 1376 { 1377 unsigned cpu = (unsigned long)hcpu; 1378 1379 switch (action) { 1380 case CPU_ONLINE: 1381 case CPU_ONLINE_FROZEN: 1382 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); 1383 fcoe_percpu_thread_create(cpu); 1384 break; 1385 case CPU_DEAD: 1386 case CPU_DEAD_FROZEN: 1387 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); 1388 fcoe_percpu_thread_destroy(cpu); 1389 break; 1390 default: 1391 break; 1392 } 1393 return NOTIFY_OK; 1394 } 1395 1396 /** 1397 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming 1398 * command. 1399 * 1400 * This routine selects next CPU based on cpumask to distribute 1401 * incoming requests in round robin. 1402 * 1403 * Returns: int CPU number 1404 */ 1405 static inline unsigned int fcoe_select_cpu(void) 1406 { 1407 static unsigned int selected_cpu; 1408 1409 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); 1410 if (selected_cpu >= nr_cpu_ids) 1411 selected_cpu = cpumask_first(cpu_online_mask); 1412 1413 return selected_cpu; 1414 } 1415 1416 /** 1417 * fcoe_rcv() - Receive packets from a net device 1418 * @skb: The received packet 1419 * @netdev: The net device that the packet was received on 1420 * @ptype: The packet type context 1421 * @olddev: The last device net device 1422 * 1423 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a 1424 * FC frame and passes the frame to libfc. 1425 * 1426 * Returns: 0 for success 1427 */ 1428 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, 1429 struct packet_type *ptype, struct net_device *olddev) 1430 { 1431 struct fc_lport *lport; 1432 struct fcoe_rcv_info *fr; 1433 struct fcoe_ctlr *ctlr; 1434 struct fcoe_interface *fcoe; 1435 struct fc_frame_header *fh; 1436 struct fcoe_percpu_s *fps; 1437 struct ethhdr *eh; 1438 unsigned int cpu; 1439 1440 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); 1441 ctlr = fcoe_to_ctlr(fcoe); 1442 lport = ctlr->lp; 1443 if (unlikely(!lport)) { 1444 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n"); 1445 goto err2; 1446 } 1447 if (!lport->link_up) 1448 goto err2; 1449 1450 FCOE_NETDEV_DBG(netdev, 1451 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n", 1452 skb->len, skb->data_len, skb->head, skb->data, 1453 skb_tail_pointer(skb), skb_end_pointer(skb), 1454 skb->csum, skb->dev ? skb->dev->name : "<NULL>"); 1455 1456 1457 skb = skb_share_check(skb, GFP_ATOMIC); 1458 1459 if (skb == NULL) 1460 return NET_RX_DROP; 1461 1462 eh = eth_hdr(skb); 1463 1464 if (is_fip_mode(ctlr) && 1465 !ether_addr_equal(eh->h_source, ctlr->dest_addr)) { 1466 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n", 1467 eh->h_source); 1468 goto err; 1469 } 1470 1471 /* 1472 * Check for minimum frame length, and make sure required FCoE 1473 * and FC headers are pulled into the linear data area. 1474 */ 1475 if (unlikely((skb->len < FCOE_MIN_FRAME) || 1476 !pskb_may_pull(skb, FCOE_HEADER_LEN))) 1477 goto err; 1478 1479 skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); 1480 fh = (struct fc_frame_header *) skb_transport_header(skb); 1481 1482 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) { 1483 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n", 1484 eh->h_dest); 1485 goto err; 1486 } 1487 1488 fr = fcoe_dev_from_skb(skb); 1489 fr->fr_dev = lport; 1490 1491 /* 1492 * In case the incoming frame's exchange is originated from 1493 * the initiator, then received frame's exchange id is ANDed 1494 * with fc_cpu_mask bits to get the same cpu on which exchange 1495 * was originated, otherwise select cpu using rx exchange id 1496 * or fcoe_select_cpu(). 1497 */ 1498 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) 1499 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; 1500 else { 1501 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN) 1502 cpu = fcoe_select_cpu(); 1503 else 1504 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask; 1505 } 1506 1507 if (cpu >= nr_cpu_ids) 1508 goto err; 1509 1510 fps = &per_cpu(fcoe_percpu, cpu); 1511 spin_lock(&fps->fcoe_rx_list.lock); 1512 if (unlikely(!fps->thread)) { 1513 /* 1514 * The targeted CPU is not ready, let's target 1515 * the first CPU now. For non-SMP systems this 1516 * will check the same CPU twice. 1517 */ 1518 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread " 1519 "ready for incoming skb- using first online " 1520 "CPU.\n"); 1521 1522 spin_unlock(&fps->fcoe_rx_list.lock); 1523 cpu = cpumask_first(cpu_online_mask); 1524 fps = &per_cpu(fcoe_percpu, cpu); 1525 spin_lock(&fps->fcoe_rx_list.lock); 1526 if (!fps->thread) { 1527 spin_unlock(&fps->fcoe_rx_list.lock); 1528 goto err; 1529 } 1530 } 1531 1532 /* 1533 * We now have a valid CPU that we're targeting for 1534 * this skb. We also have this receive thread locked, 1535 * so we're free to queue skbs into it's queue. 1536 */ 1537 1538 /* 1539 * Note: We used to have a set of conditions under which we would 1540 * call fcoe_recv_frame directly, rather than queuing to the rx list 1541 * as it could save a few cycles, but doing so is prohibited, as 1542 * fcoe_recv_frame has several paths that may sleep, which is forbidden 1543 * in softirq context. 1544 */ 1545 __skb_queue_tail(&fps->fcoe_rx_list, skb); 1546 if (fps->thread->state == TASK_INTERRUPTIBLE) 1547 wake_up_process(fps->thread); 1548 spin_unlock(&fps->fcoe_rx_list.lock); 1549 1550 return NET_RX_SUCCESS; 1551 err: 1552 per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++; 1553 put_cpu(); 1554 err2: 1555 kfree_skb(skb); 1556 return NET_RX_DROP; 1557 } 1558 1559 /** 1560 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC 1561 * @skb: The packet to be transmitted 1562 * @tlen: The total length of the trailer 1563 * 1564 * Returns: 0 for success 1565 */ 1566 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) 1567 { 1568 struct fcoe_percpu_s *fps; 1569 int rc; 1570 1571 fps = &get_cpu_var(fcoe_percpu); 1572 rc = fcoe_get_paged_crc_eof(skb, tlen, fps); 1573 put_cpu_var(fcoe_percpu); 1574 1575 return rc; 1576 } 1577 1578 /** 1579 * fcoe_xmit() - Transmit a FCoE frame 1580 * @lport: The local port that the frame is to be transmitted for 1581 * @fp: The frame to be transmitted 1582 * 1583 * Return: 0 for success 1584 */ 1585 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp) 1586 { 1587 int wlen; 1588 u32 crc; 1589 struct ethhdr *eh; 1590 struct fcoe_crc_eof *cp; 1591 struct sk_buff *skb; 1592 struct fc_stats *stats; 1593 struct fc_frame_header *fh; 1594 unsigned int hlen; /* header length implies the version */ 1595 unsigned int tlen; /* trailer length */ 1596 unsigned int elen; /* eth header, may include vlan */ 1597 struct fcoe_port *port = lport_priv(lport); 1598 struct fcoe_interface *fcoe = port->priv; 1599 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1600 u8 sof, eof; 1601 struct fcoe_hdr *hp; 1602 1603 WARN_ON((fr_len(fp) % sizeof(u32)) != 0); 1604 1605 fh = fc_frame_header_get(fp); 1606 skb = fp_skb(fp); 1607 wlen = skb->len / FCOE_WORD_TO_BYTE; 1608 1609 if (!lport->link_up) { 1610 kfree_skb(skb); 1611 return 0; 1612 } 1613 1614 if (unlikely(fh->fh_type == FC_TYPE_ELS) && 1615 fcoe_ctlr_els_send(ctlr, lport, skb)) 1616 return 0; 1617 1618 sof = fr_sof(fp); 1619 eof = fr_eof(fp); 1620 1621 elen = sizeof(struct ethhdr); 1622 hlen = sizeof(struct fcoe_hdr); 1623 tlen = sizeof(struct fcoe_crc_eof); 1624 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; 1625 1626 /* crc offload */ 1627 if (likely(lport->crc_offload)) { 1628 skb->ip_summed = CHECKSUM_UNNECESSARY; 1629 skb->csum_start = skb_headroom(skb); 1630 skb->csum_offset = skb->len; 1631 crc = 0; 1632 } else { 1633 skb->ip_summed = CHECKSUM_NONE; 1634 crc = fcoe_fc_crc(fp); 1635 } 1636 1637 /* copy port crc and eof to the skb buff */ 1638 if (skb_is_nonlinear(skb)) { 1639 skb_frag_t *frag; 1640 if (fcoe_alloc_paged_crc_eof(skb, tlen)) { 1641 kfree_skb(skb); 1642 return -ENOMEM; 1643 } 1644 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; 1645 cp = kmap_atomic(skb_frag_page(frag)) 1646 + frag->page_offset; 1647 } else { 1648 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); 1649 } 1650 1651 memset(cp, 0, sizeof(*cp)); 1652 cp->fcoe_eof = eof; 1653 cp->fcoe_crc32 = cpu_to_le32(~crc); 1654 1655 if (skb_is_nonlinear(skb)) { 1656 kunmap_atomic(cp); 1657 cp = NULL; 1658 } 1659 1660 /* adjust skb network/transport offsets to match mac/fcoe/port */ 1661 skb_push(skb, elen + hlen); 1662 skb_reset_mac_header(skb); 1663 skb_reset_network_header(skb); 1664 skb->mac_len = elen; 1665 skb->protocol = htons(ETH_P_FCOE); 1666 skb->priority = fcoe->priority; 1667 1668 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN && 1669 fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) { 1670 /* must set skb->dev before calling vlan_put_tag */ 1671 skb->dev = fcoe->realdev; 1672 skb = __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 1673 vlan_dev_vlan_id(fcoe->netdev)); 1674 if (!skb) 1675 return -ENOMEM; 1676 } else 1677 skb->dev = fcoe->netdev; 1678 1679 /* fill up mac and fcoe headers */ 1680 eh = eth_hdr(skb); 1681 eh->h_proto = htons(ETH_P_FCOE); 1682 memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN); 1683 if (ctlr->map_dest) 1684 memcpy(eh->h_dest + 3, fh->fh_d_id, 3); 1685 1686 if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN)) 1687 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN); 1688 else 1689 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); 1690 1691 hp = (struct fcoe_hdr *)(eh + 1); 1692 memset(hp, 0, sizeof(*hp)); 1693 if (FC_FCOE_VER) 1694 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); 1695 hp->fcoe_sof = sof; 1696 1697 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ 1698 if (lport->seq_offload && fr_max_payload(fp)) { 1699 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; 1700 skb_shinfo(skb)->gso_size = fr_max_payload(fp); 1701 } else { 1702 skb_shinfo(skb)->gso_type = 0; 1703 skb_shinfo(skb)->gso_size = 0; 1704 } 1705 /* update tx stats: regardless if LLD fails */ 1706 stats = per_cpu_ptr(lport->stats, get_cpu()); 1707 stats->TxFrames++; 1708 stats->TxWords += wlen; 1709 put_cpu(); 1710 1711 /* send down to lld */ 1712 fr_dev(fp) = lport; 1713 fcoe_port_send(port, skb); 1714 return 0; 1715 } 1716 1717 /** 1718 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion 1719 * @skb: The completed skb (argument required by destructor) 1720 */ 1721 static void fcoe_percpu_flush_done(struct sk_buff *skb) 1722 { 1723 complete(&fcoe_flush_completion); 1724 } 1725 1726 /** 1727 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC 1728 * @lport: The local port the frame was received on 1729 * @fp: The received frame 1730 * 1731 * Return: 0 on passing filtering checks 1732 */ 1733 static inline int fcoe_filter_frames(struct fc_lport *lport, 1734 struct fc_frame *fp) 1735 { 1736 struct fcoe_ctlr *ctlr; 1737 struct fcoe_interface *fcoe; 1738 struct fc_frame_header *fh; 1739 struct sk_buff *skb = (struct sk_buff *)fp; 1740 struct fc_stats *stats; 1741 1742 /* 1743 * We only check CRC if no offload is available and if it is 1744 * it's solicited data, in which case, the FCP layer would 1745 * check it during the copy. 1746 */ 1747 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) 1748 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1749 else 1750 fr_flags(fp) |= FCPHF_CRC_UNCHECKED; 1751 1752 fh = (struct fc_frame_header *) skb_transport_header(skb); 1753 fh = fc_frame_header_get(fp); 1754 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP) 1755 return 0; 1756 1757 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv; 1758 ctlr = fcoe_to_ctlr(fcoe); 1759 if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO && 1760 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) { 1761 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n"); 1762 return -EINVAL; 1763 } 1764 1765 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) || 1766 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) { 1767 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1768 return 0; 1769 } 1770 1771 stats = per_cpu_ptr(lport->stats, get_cpu()); 1772 stats->InvalidCRCCount++; 1773 if (stats->InvalidCRCCount < 5) 1774 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); 1775 put_cpu(); 1776 return -EINVAL; 1777 } 1778 1779 /** 1780 * fcoe_recv_frame() - process a single received frame 1781 * @skb: frame to process 1782 */ 1783 static void fcoe_recv_frame(struct sk_buff *skb) 1784 { 1785 u32 fr_len; 1786 struct fc_lport *lport; 1787 struct fcoe_rcv_info *fr; 1788 struct fc_stats *stats; 1789 struct fcoe_crc_eof crc_eof; 1790 struct fc_frame *fp; 1791 struct fcoe_port *port; 1792 struct fcoe_hdr *hp; 1793 1794 fr = fcoe_dev_from_skb(skb); 1795 lport = fr->fr_dev; 1796 if (unlikely(!lport)) { 1797 if (skb->destructor != fcoe_percpu_flush_done) 1798 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n"); 1799 kfree_skb(skb); 1800 return; 1801 } 1802 1803 FCOE_NETDEV_DBG(skb->dev, 1804 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n", 1805 skb->len, skb->data_len, 1806 skb->head, skb->data, skb_tail_pointer(skb), 1807 skb_end_pointer(skb), skb->csum, 1808 skb->dev ? skb->dev->name : "<NULL>"); 1809 1810 port = lport_priv(lport); 1811 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */ 1812 1813 /* 1814 * Frame length checks and setting up the header pointers 1815 * was done in fcoe_rcv already. 1816 */ 1817 hp = (struct fcoe_hdr *) skb_network_header(skb); 1818 1819 stats = per_cpu_ptr(lport->stats, get_cpu()); 1820 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { 1821 if (stats->ErrorFrames < 5) 1822 printk(KERN_WARNING "fcoe: FCoE version " 1823 "mismatch: The frame has " 1824 "version %x, but the " 1825 "initiator supports version " 1826 "%x\n", FC_FCOE_DECAPS_VER(hp), 1827 FC_FCOE_VER); 1828 goto drop; 1829 } 1830 1831 skb_pull(skb, sizeof(struct fcoe_hdr)); 1832 fr_len = skb->len - sizeof(struct fcoe_crc_eof); 1833 1834 stats->RxFrames++; 1835 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; 1836 1837 fp = (struct fc_frame *)skb; 1838 fc_frame_init(fp); 1839 fr_dev(fp) = lport; 1840 fr_sof(fp) = hp->fcoe_sof; 1841 1842 /* Copy out the CRC and EOF trailer for access */ 1843 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) 1844 goto drop; 1845 fr_eof(fp) = crc_eof.fcoe_eof; 1846 fr_crc(fp) = crc_eof.fcoe_crc32; 1847 if (pskb_trim(skb, fr_len)) 1848 goto drop; 1849 1850 if (!fcoe_filter_frames(lport, fp)) { 1851 put_cpu(); 1852 fc_exch_recv(lport, fp); 1853 return; 1854 } 1855 drop: 1856 stats->ErrorFrames++; 1857 put_cpu(); 1858 kfree_skb(skb); 1859 } 1860 1861 /** 1862 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread 1863 * @arg: The per-CPU context 1864 * 1865 * Return: 0 for success 1866 */ 1867 static int fcoe_percpu_receive_thread(void *arg) 1868 { 1869 struct fcoe_percpu_s *p = arg; 1870 struct sk_buff *skb; 1871 struct sk_buff_head tmp; 1872 1873 skb_queue_head_init(&tmp); 1874 1875 set_user_nice(current, MIN_NICE); 1876 1877 retry: 1878 while (!kthread_should_stop()) { 1879 1880 spin_lock_bh(&p->fcoe_rx_list.lock); 1881 skb_queue_splice_init(&p->fcoe_rx_list, &tmp); 1882 1883 if (!skb_queue_len(&tmp)) { 1884 set_current_state(TASK_INTERRUPTIBLE); 1885 spin_unlock_bh(&p->fcoe_rx_list.lock); 1886 schedule(); 1887 goto retry; 1888 } 1889 1890 spin_unlock_bh(&p->fcoe_rx_list.lock); 1891 1892 while ((skb = __skb_dequeue(&tmp)) != NULL) 1893 fcoe_recv_frame(skb); 1894 1895 } 1896 return 0; 1897 } 1898 1899 /** 1900 * fcoe_dev_setup() - Setup the link change notification interface 1901 */ 1902 static void fcoe_dev_setup(void) 1903 { 1904 register_dcbevent_notifier(&dcb_notifier); 1905 register_netdevice_notifier(&fcoe_notifier); 1906 } 1907 1908 /** 1909 * fcoe_dev_cleanup() - Cleanup the link change notification interface 1910 */ 1911 static void fcoe_dev_cleanup(void) 1912 { 1913 unregister_dcbevent_notifier(&dcb_notifier); 1914 unregister_netdevice_notifier(&fcoe_notifier); 1915 } 1916 1917 static struct fcoe_interface * 1918 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev) 1919 { 1920 struct fcoe_interface *fcoe; 1921 struct net_device *real_dev; 1922 1923 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1924 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 1925 real_dev = vlan_dev_real_dev(fcoe->netdev); 1926 else 1927 real_dev = fcoe->netdev; 1928 1929 if (netdev == real_dev) 1930 return fcoe; 1931 } 1932 return NULL; 1933 } 1934 1935 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 1936 ulong event, void *ptr) 1937 { 1938 struct dcb_app_type *entry = ptr; 1939 struct fcoe_ctlr *ctlr; 1940 struct fcoe_interface *fcoe; 1941 struct net_device *netdev; 1942 int prio; 1943 1944 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE) 1945 return NOTIFY_OK; 1946 1947 netdev = dev_get_by_index(&init_net, entry->ifindex); 1948 if (!netdev) 1949 return NOTIFY_OK; 1950 1951 fcoe = fcoe_hostlist_lookup_realdev_port(netdev); 1952 dev_put(netdev); 1953 if (!fcoe) 1954 return NOTIFY_OK; 1955 1956 ctlr = fcoe_to_ctlr(fcoe); 1957 1958 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE) 1959 prio = ffs(entry->app.priority) - 1; 1960 else 1961 prio = entry->app.priority; 1962 1963 if (prio < 0) 1964 return NOTIFY_OK; 1965 1966 if (entry->app.protocol == ETH_P_FIP || 1967 entry->app.protocol == ETH_P_FCOE) 1968 ctlr->priority = prio; 1969 1970 if (entry->app.protocol == ETH_P_FCOE) 1971 fcoe->priority = prio; 1972 1973 return NOTIFY_OK; 1974 } 1975 1976 /** 1977 * fcoe_device_notification() - Handler for net device events 1978 * @notifier: The context of the notification 1979 * @event: The type of event 1980 * @ptr: The net device that the event was on 1981 * 1982 * This function is called by the Ethernet driver in case of link change event. 1983 * 1984 * Returns: 0 for success 1985 */ 1986 static int fcoe_device_notification(struct notifier_block *notifier, 1987 ulong event, void *ptr) 1988 { 1989 struct fcoe_ctlr_device *cdev; 1990 struct fc_lport *lport = NULL; 1991 struct net_device *netdev = netdev_notifier_info_to_dev(ptr); 1992 struct fcoe_ctlr *ctlr; 1993 struct fcoe_interface *fcoe; 1994 struct fcoe_port *port; 1995 struct fc_stats *stats; 1996 u32 link_possible = 1; 1997 u32 mfs; 1998 int rc = NOTIFY_OK; 1999 2000 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 2001 if (fcoe->netdev == netdev) { 2002 ctlr = fcoe_to_ctlr(fcoe); 2003 lport = ctlr->lp; 2004 break; 2005 } 2006 } 2007 if (!lport) { 2008 rc = NOTIFY_DONE; 2009 goto out; 2010 } 2011 2012 switch (event) { 2013 case NETDEV_DOWN: 2014 case NETDEV_GOING_DOWN: 2015 link_possible = 0; 2016 break; 2017 case NETDEV_UP: 2018 case NETDEV_CHANGE: 2019 break; 2020 case NETDEV_CHANGEMTU: 2021 if (netdev->features & NETIF_F_FCOE_MTU) 2022 break; 2023 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + 2024 sizeof(struct fcoe_crc_eof)); 2025 if (mfs >= FC_MIN_MAX_FRAME) 2026 fc_set_mfs(lport, mfs); 2027 break; 2028 case NETDEV_REGISTER: 2029 break; 2030 case NETDEV_UNREGISTER: 2031 list_del(&fcoe->list); 2032 port = lport_priv(ctlr->lp); 2033 queue_work(fcoe_wq, &port->destroy_work); 2034 goto out; 2035 break; 2036 case NETDEV_FEAT_CHANGE: 2037 fcoe_netdev_features_change(lport, netdev); 2038 break; 2039 default: 2040 FCOE_NETDEV_DBG(netdev, "Unknown event %ld " 2041 "from netdev netlink\n", event); 2042 } 2043 2044 fcoe_link_speed_update(lport); 2045 2046 cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2047 2048 if (link_possible && !fcoe_link_ok(lport)) { 2049 switch (cdev->enabled) { 2050 case FCOE_CTLR_DISABLED: 2051 pr_info("Link up while interface is disabled.\n"); 2052 break; 2053 case FCOE_CTLR_ENABLED: 2054 case FCOE_CTLR_UNUSED: 2055 fcoe_ctlr_link_up(ctlr); 2056 }; 2057 } else if (fcoe_ctlr_link_down(ctlr)) { 2058 switch (cdev->enabled) { 2059 case FCOE_CTLR_DISABLED: 2060 pr_info("Link down while interface is disabled.\n"); 2061 break; 2062 case FCOE_CTLR_ENABLED: 2063 case FCOE_CTLR_UNUSED: 2064 stats = per_cpu_ptr(lport->stats, get_cpu()); 2065 stats->LinkFailureCount++; 2066 put_cpu(); 2067 fcoe_clean_pending_queue(lport); 2068 }; 2069 } 2070 out: 2071 return rc; 2072 } 2073 2074 /** 2075 * fcoe_disable() - Disables a FCoE interface 2076 * @netdev : The net_device object the Ethernet interface to create on 2077 * 2078 * Called from fcoe transport. 2079 * 2080 * Returns: 0 for success 2081 * 2082 * Deprecated: use fcoe_ctlr_enabled() 2083 */ 2084 static int fcoe_disable(struct net_device *netdev) 2085 { 2086 struct fcoe_ctlr *ctlr; 2087 struct fcoe_interface *fcoe; 2088 int rc = 0; 2089 2090 mutex_lock(&fcoe_config_mutex); 2091 2092 rtnl_lock(); 2093 fcoe = fcoe_hostlist_lookup_port(netdev); 2094 rtnl_unlock(); 2095 2096 if (fcoe) { 2097 ctlr = fcoe_to_ctlr(fcoe); 2098 fcoe_ctlr_link_down(ctlr); 2099 fcoe_clean_pending_queue(ctlr->lp); 2100 } else 2101 rc = -ENODEV; 2102 2103 mutex_unlock(&fcoe_config_mutex); 2104 return rc; 2105 } 2106 2107 /** 2108 * fcoe_enable() - Enables a FCoE interface 2109 * @netdev : The net_device object the Ethernet interface to create on 2110 * 2111 * Called from fcoe transport. 2112 * 2113 * Returns: 0 for success 2114 */ 2115 static int fcoe_enable(struct net_device *netdev) 2116 { 2117 struct fcoe_ctlr *ctlr; 2118 struct fcoe_interface *fcoe; 2119 int rc = 0; 2120 2121 mutex_lock(&fcoe_config_mutex); 2122 rtnl_lock(); 2123 fcoe = fcoe_hostlist_lookup_port(netdev); 2124 rtnl_unlock(); 2125 2126 if (!fcoe) { 2127 rc = -ENODEV; 2128 goto out; 2129 } 2130 2131 ctlr = fcoe_to_ctlr(fcoe); 2132 2133 if (!fcoe_link_ok(ctlr->lp)) 2134 fcoe_ctlr_link_up(ctlr); 2135 2136 out: 2137 mutex_unlock(&fcoe_config_mutex); 2138 return rc; 2139 } 2140 2141 /** 2142 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller 2143 * @cdev: The FCoE Controller that is being enabled or disabled 2144 * 2145 * fcoe_sysfs will ensure that the state of 'enabled' has 2146 * changed, so no checking is necessary here. This routine simply 2147 * calls fcoe_enable or fcoe_disable, both of which are deprecated. 2148 * When those routines are removed the functionality can be merged 2149 * here. 2150 */ 2151 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev) 2152 { 2153 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev); 2154 struct fc_lport *lport = ctlr->lp; 2155 struct net_device *netdev = fcoe_netdev(lport); 2156 2157 switch (cdev->enabled) { 2158 case FCOE_CTLR_ENABLED: 2159 return fcoe_enable(netdev); 2160 case FCOE_CTLR_DISABLED: 2161 return fcoe_disable(netdev); 2162 case FCOE_CTLR_UNUSED: 2163 default: 2164 return -ENOTSUPP; 2165 }; 2166 } 2167 2168 /** 2169 * fcoe_destroy() - Destroy a FCoE interface 2170 * @netdev : The net_device object the Ethernet interface to create on 2171 * 2172 * Called from fcoe transport 2173 * 2174 * Returns: 0 for success 2175 */ 2176 static int fcoe_destroy(struct net_device *netdev) 2177 { 2178 struct fcoe_ctlr *ctlr; 2179 struct fcoe_interface *fcoe; 2180 struct fc_lport *lport; 2181 struct fcoe_port *port; 2182 int rc = 0; 2183 2184 mutex_lock(&fcoe_config_mutex); 2185 rtnl_lock(); 2186 fcoe = fcoe_hostlist_lookup_port(netdev); 2187 if (!fcoe) { 2188 rc = -ENODEV; 2189 goto out_nodev; 2190 } 2191 ctlr = fcoe_to_ctlr(fcoe); 2192 lport = ctlr->lp; 2193 port = lport_priv(lport); 2194 list_del(&fcoe->list); 2195 queue_work(fcoe_wq, &port->destroy_work); 2196 out_nodev: 2197 rtnl_unlock(); 2198 mutex_unlock(&fcoe_config_mutex); 2199 return rc; 2200 } 2201 2202 /** 2203 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context 2204 * @work: Handle to the FCoE port to be destroyed 2205 */ 2206 static void fcoe_destroy_work(struct work_struct *work) 2207 { 2208 struct fcoe_ctlr_device *cdev; 2209 struct fcoe_ctlr *ctlr; 2210 struct fcoe_port *port; 2211 struct fcoe_interface *fcoe; 2212 struct Scsi_Host *shost; 2213 struct fc_host_attrs *fc_host; 2214 unsigned long flags; 2215 struct fc_vport *vport; 2216 struct fc_vport *next_vport; 2217 2218 port = container_of(work, struct fcoe_port, destroy_work); 2219 shost = port->lport->host; 2220 fc_host = shost_to_fc_host(shost); 2221 2222 /* Loop through all the vports and mark them for deletion */ 2223 spin_lock_irqsave(shost->host_lock, flags); 2224 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) { 2225 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) { 2226 continue; 2227 } else { 2228 vport->flags |= FC_VPORT_DELETING; 2229 queue_work(fc_host_work_q(shost), 2230 &vport->vport_delete_work); 2231 } 2232 } 2233 spin_unlock_irqrestore(shost->host_lock, flags); 2234 2235 flush_workqueue(fc_host_work_q(shost)); 2236 2237 mutex_lock(&fcoe_config_mutex); 2238 2239 fcoe = port->priv; 2240 ctlr = fcoe_to_ctlr(fcoe); 2241 cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2242 2243 fcoe_if_destroy(port->lport); 2244 fcoe_interface_cleanup(fcoe); 2245 2246 mutex_unlock(&fcoe_config_mutex); 2247 2248 fcoe_ctlr_device_delete(cdev); 2249 } 2250 2251 /** 2252 * fcoe_match() - Check if the FCoE is supported on the given netdevice 2253 * @netdev : The net_device object the Ethernet interface to create on 2254 * 2255 * Called from fcoe transport. 2256 * 2257 * Returns: always returns true as this is the default FCoE transport, 2258 * i.e., support all netdevs. 2259 */ 2260 static bool fcoe_match(struct net_device *netdev) 2261 { 2262 return true; 2263 } 2264 2265 /** 2266 * fcoe_dcb_create() - Initialize DCB attributes and hooks 2267 * @netdev: The net_device object of the L2 link that should be queried 2268 * @port: The fcoe_port to bind FCoE APP priority with 2269 * @ 2270 */ 2271 static void fcoe_dcb_create(struct fcoe_interface *fcoe) 2272 { 2273 #ifdef CONFIG_DCB 2274 int dcbx; 2275 u8 fup, up; 2276 struct net_device *netdev = fcoe->realdev; 2277 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2278 struct dcb_app app = { 2279 .priority = 0, 2280 .protocol = ETH_P_FCOE 2281 }; 2282 2283 /* setup DCB priority attributes. */ 2284 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) { 2285 dcbx = netdev->dcbnl_ops->getdcbx(netdev); 2286 2287 if (dcbx & DCB_CAP_DCBX_VER_IEEE) { 2288 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE; 2289 up = dcb_ieee_getapp_mask(netdev, &app); 2290 app.protocol = ETH_P_FIP; 2291 fup = dcb_ieee_getapp_mask(netdev, &app); 2292 } else { 2293 app.selector = DCB_APP_IDTYPE_ETHTYPE; 2294 up = dcb_getapp(netdev, &app); 2295 app.protocol = ETH_P_FIP; 2296 fup = dcb_getapp(netdev, &app); 2297 } 2298 2299 fcoe->priority = ffs(up) ? ffs(up) - 1 : 0; 2300 ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority; 2301 } 2302 #endif 2303 } 2304 2305 enum fcoe_create_link_state { 2306 FCOE_CREATE_LINK_DOWN, 2307 FCOE_CREATE_LINK_UP, 2308 }; 2309 2310 /** 2311 * _fcoe_create() - (internal) Create a fcoe interface 2312 * @netdev : The net_device object the Ethernet interface to create on 2313 * @fip_mode: The FIP mode for this creation 2314 * @link_state: The ctlr link state on creation 2315 * 2316 * Called from either the libfcoe 'create' module parameter 2317 * via fcoe_create or from fcoe_syfs's ctlr_create file. 2318 * 2319 * libfcoe's 'create' module parameter is deprecated so some 2320 * consolidation of code can be done when that interface is 2321 * removed. 2322 */ 2323 static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode, 2324 enum fcoe_create_link_state link_state) 2325 { 2326 int rc = 0; 2327 struct fcoe_ctlr_device *ctlr_dev; 2328 struct fcoe_ctlr *ctlr; 2329 struct fcoe_interface *fcoe; 2330 struct fc_lport *lport; 2331 2332 mutex_lock(&fcoe_config_mutex); 2333 rtnl_lock(); 2334 2335 /* look for existing lport */ 2336 if (fcoe_hostlist_lookup(netdev)) { 2337 rc = -EEXIST; 2338 goto out_nodev; 2339 } 2340 2341 fcoe = fcoe_interface_create(netdev, fip_mode); 2342 if (IS_ERR(fcoe)) { 2343 rc = PTR_ERR(fcoe); 2344 goto out_nodev; 2345 } 2346 2347 ctlr = fcoe_to_ctlr(fcoe); 2348 ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr); 2349 lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0); 2350 if (IS_ERR(lport)) { 2351 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", 2352 netdev->name); 2353 rc = -EIO; 2354 rtnl_unlock(); 2355 fcoe_interface_cleanup(fcoe); 2356 mutex_unlock(&fcoe_config_mutex); 2357 fcoe_ctlr_device_delete(ctlr_dev); 2358 goto out; 2359 } 2360 2361 /* Make this the "master" N_Port */ 2362 ctlr->lp = lport; 2363 2364 /* setup DCB priority attributes. */ 2365 fcoe_dcb_create(fcoe); 2366 2367 /* start FIP Discovery and FLOGI */ 2368 lport->boot_time = jiffies; 2369 fc_fabric_login(lport); 2370 2371 /* 2372 * If the fcoe_ctlr_device is to be set to DISABLED 2373 * it must be done after the lport is added to the 2374 * hostlist, but before the rtnl_lock is released. 2375 * This is because the rtnl_lock protects the 2376 * hostlist that fcoe_device_notification uses. If 2377 * the FCoE Controller is intended to be created 2378 * DISABLED then 'enabled' needs to be considered 2379 * handling link events. 'enabled' must be set 2380 * before the lport can be found in the hostlist 2381 * when a link up event is received. 2382 */ 2383 if (link_state == FCOE_CREATE_LINK_UP) 2384 ctlr_dev->enabled = FCOE_CTLR_ENABLED; 2385 else 2386 ctlr_dev->enabled = FCOE_CTLR_DISABLED; 2387 2388 if (link_state == FCOE_CREATE_LINK_UP && 2389 !fcoe_link_ok(lport)) { 2390 rtnl_unlock(); 2391 fcoe_ctlr_link_up(ctlr); 2392 mutex_unlock(&fcoe_config_mutex); 2393 return rc; 2394 } 2395 2396 out_nodev: 2397 rtnl_unlock(); 2398 mutex_unlock(&fcoe_config_mutex); 2399 out: 2400 return rc; 2401 } 2402 2403 /** 2404 * fcoe_create() - Create a fcoe interface 2405 * @netdev : The net_device object the Ethernet interface to create on 2406 * @fip_mode: The FIP mode for this creation 2407 * 2408 * Called from fcoe transport 2409 * 2410 * Returns: 0 for success 2411 */ 2412 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode) 2413 { 2414 return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP); 2415 } 2416 2417 /** 2418 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs 2419 * @netdev: The net_device to be used by the allocated FCoE Controller 2420 * 2421 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr 2422 * in a link_down state. The allows the user an opportunity to configure 2423 * the FCoE Controller from sysfs before enabling the FCoE Controller. 2424 * 2425 * Creating in with this routine starts the FCoE Controller in Fabric 2426 * mode. The user can change to VN2VN or another mode before enabling. 2427 */ 2428 static int fcoe_ctlr_alloc(struct net_device *netdev) 2429 { 2430 return _fcoe_create(netdev, FIP_MODE_FABRIC, 2431 FCOE_CREATE_LINK_DOWN); 2432 } 2433 2434 /** 2435 * fcoe_link_ok() - Check if the link is OK for a local port 2436 * @lport: The local port to check link on 2437 * 2438 * Returns: 0 if link is UP and OK, -1 if not 2439 * 2440 */ 2441 static int fcoe_link_ok(struct fc_lport *lport) 2442 { 2443 struct net_device *netdev = fcoe_netdev(lport); 2444 2445 if (netif_oper_up(netdev)) 2446 return 0; 2447 return -1; 2448 } 2449 2450 /** 2451 * fcoe_percpu_clean() - Clear all pending skbs for an local port 2452 * @lport: The local port whose skbs are to be cleared 2453 * 2454 * Must be called with fcoe_create_mutex held to single-thread completion. 2455 * 2456 * This flushes the pending skbs by adding a new skb to each queue and 2457 * waiting until they are all freed. This assures us that not only are 2458 * there no packets that will be handled by the lport, but also that any 2459 * threads already handling packet have returned. 2460 */ 2461 static void fcoe_percpu_clean(struct fc_lport *lport) 2462 { 2463 struct fcoe_percpu_s *pp; 2464 struct sk_buff *skb; 2465 unsigned int cpu; 2466 2467 for_each_possible_cpu(cpu) { 2468 pp = &per_cpu(fcoe_percpu, cpu); 2469 2470 if (!pp->thread || !cpu_online(cpu)) 2471 continue; 2472 2473 skb = dev_alloc_skb(0); 2474 if (!skb) 2475 continue; 2476 2477 skb->destructor = fcoe_percpu_flush_done; 2478 2479 spin_lock_bh(&pp->fcoe_rx_list.lock); 2480 __skb_queue_tail(&pp->fcoe_rx_list, skb); 2481 if (pp->fcoe_rx_list.qlen == 1) 2482 wake_up_process(pp->thread); 2483 spin_unlock_bh(&pp->fcoe_rx_list.lock); 2484 2485 wait_for_completion(&fcoe_flush_completion); 2486 } 2487 } 2488 2489 /** 2490 * fcoe_reset() - Reset a local port 2491 * @shost: The SCSI host associated with the local port to be reset 2492 * 2493 * Returns: Always 0 (return value required by FC transport template) 2494 */ 2495 static int fcoe_reset(struct Scsi_Host *shost) 2496 { 2497 struct fc_lport *lport = shost_priv(shost); 2498 struct fcoe_port *port = lport_priv(lport); 2499 struct fcoe_interface *fcoe = port->priv; 2500 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2501 struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2502 2503 fcoe_ctlr_link_down(ctlr); 2504 fcoe_clean_pending_queue(ctlr->lp); 2505 2506 if (cdev->enabled != FCOE_CTLR_DISABLED && 2507 !fcoe_link_ok(ctlr->lp)) 2508 fcoe_ctlr_link_up(ctlr); 2509 return 0; 2510 } 2511 2512 /** 2513 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device 2514 * @netdev: The net device used as a key 2515 * 2516 * Locking: Must be called with the RNL mutex held. 2517 * 2518 * Returns: NULL or the FCoE interface 2519 */ 2520 static struct fcoe_interface * 2521 fcoe_hostlist_lookup_port(const struct net_device *netdev) 2522 { 2523 struct fcoe_interface *fcoe; 2524 2525 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 2526 if (fcoe->netdev == netdev) 2527 return fcoe; 2528 } 2529 return NULL; 2530 } 2531 2532 /** 2533 * fcoe_hostlist_lookup() - Find the local port associated with a 2534 * given net device 2535 * @netdev: The netdevice used as a key 2536 * 2537 * Locking: Must be called with the RTNL mutex held 2538 * 2539 * Returns: NULL or the local port 2540 */ 2541 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) 2542 { 2543 struct fcoe_ctlr *ctlr; 2544 struct fcoe_interface *fcoe; 2545 2546 fcoe = fcoe_hostlist_lookup_port(netdev); 2547 ctlr = fcoe_to_ctlr(fcoe); 2548 return (fcoe) ? ctlr->lp : NULL; 2549 } 2550 2551 /** 2552 * fcoe_hostlist_add() - Add the FCoE interface identified by a local 2553 * port to the hostlist 2554 * @lport: The local port that identifies the FCoE interface to be added 2555 * 2556 * Locking: must be called with the RTNL mutex held 2557 * 2558 * Returns: 0 for success 2559 */ 2560 static int fcoe_hostlist_add(const struct fc_lport *lport) 2561 { 2562 struct fcoe_interface *fcoe; 2563 struct fcoe_port *port; 2564 2565 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); 2566 if (!fcoe) { 2567 port = lport_priv(lport); 2568 fcoe = port->priv; 2569 list_add_tail(&fcoe->list, &fcoe_hostlist); 2570 } 2571 return 0; 2572 } 2573 2574 /** 2575 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local 2576 * port to the hostlist 2577 * @lport: The local port that identifies the FCoE interface to be added 2578 * 2579 * Locking: must be called with the RTNL mutex held 2580 * 2581 */ 2582 static void fcoe_hostlist_del(const struct fc_lport *lport) 2583 { 2584 struct fcoe_interface *fcoe; 2585 struct fcoe_port *port; 2586 2587 port = lport_priv(lport); 2588 fcoe = port->priv; 2589 list_del(&fcoe->list); 2590 return; 2591 } 2592 2593 static struct fcoe_transport fcoe_sw_transport = { 2594 .name = {FCOE_TRANSPORT_DEFAULT}, 2595 .attached = false, 2596 .list = LIST_HEAD_INIT(fcoe_sw_transport.list), 2597 .match = fcoe_match, 2598 .alloc = fcoe_ctlr_alloc, 2599 .create = fcoe_create, 2600 .destroy = fcoe_destroy, 2601 .enable = fcoe_enable, 2602 .disable = fcoe_disable, 2603 }; 2604 2605 /** 2606 * fcoe_init() - Initialize fcoe.ko 2607 * 2608 * Returns: 0 on success, or a negative value on failure 2609 */ 2610 static int __init fcoe_init(void) 2611 { 2612 struct fcoe_percpu_s *p; 2613 unsigned int cpu; 2614 int rc = 0; 2615 2616 fcoe_wq = alloc_workqueue("fcoe", 0, 0); 2617 if (!fcoe_wq) 2618 return -ENOMEM; 2619 2620 /* register as a fcoe transport */ 2621 rc = fcoe_transport_attach(&fcoe_sw_transport); 2622 if (rc) { 2623 printk(KERN_ERR "failed to register an fcoe transport, check " 2624 "if libfcoe is loaded\n"); 2625 return rc; 2626 } 2627 2628 mutex_lock(&fcoe_config_mutex); 2629 2630 for_each_possible_cpu(cpu) { 2631 p = &per_cpu(fcoe_percpu, cpu); 2632 skb_queue_head_init(&p->fcoe_rx_list); 2633 } 2634 2635 cpu_notifier_register_begin(); 2636 2637 for_each_online_cpu(cpu) 2638 fcoe_percpu_thread_create(cpu); 2639 2640 /* Initialize per CPU interrupt thread */ 2641 rc = __register_hotcpu_notifier(&fcoe_cpu_notifier); 2642 if (rc) 2643 goto out_free; 2644 2645 cpu_notifier_register_done(); 2646 2647 /* Setup link change notification */ 2648 fcoe_dev_setup(); 2649 2650 rc = fcoe_if_init(); 2651 if (rc) 2652 goto out_free; 2653 2654 mutex_unlock(&fcoe_config_mutex); 2655 return 0; 2656 2657 out_free: 2658 for_each_online_cpu(cpu) { 2659 fcoe_percpu_thread_destroy(cpu); 2660 } 2661 2662 cpu_notifier_register_done(); 2663 2664 mutex_unlock(&fcoe_config_mutex); 2665 destroy_workqueue(fcoe_wq); 2666 return rc; 2667 } 2668 module_init(fcoe_init); 2669 2670 /** 2671 * fcoe_exit() - Clean up fcoe.ko 2672 * 2673 * Returns: 0 on success or a negative value on failure 2674 */ 2675 static void __exit fcoe_exit(void) 2676 { 2677 struct fcoe_interface *fcoe, *tmp; 2678 struct fcoe_ctlr *ctlr; 2679 struct fcoe_port *port; 2680 unsigned int cpu; 2681 2682 mutex_lock(&fcoe_config_mutex); 2683 2684 fcoe_dev_cleanup(); 2685 2686 /* releases the associated fcoe hosts */ 2687 rtnl_lock(); 2688 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) { 2689 ctlr = fcoe_to_ctlr(fcoe); 2690 port = lport_priv(ctlr->lp); 2691 fcoe_hostlist_del(port->lport); 2692 queue_work(fcoe_wq, &port->destroy_work); 2693 } 2694 rtnl_unlock(); 2695 2696 cpu_notifier_register_begin(); 2697 2698 for_each_online_cpu(cpu) 2699 fcoe_percpu_thread_destroy(cpu); 2700 2701 __unregister_hotcpu_notifier(&fcoe_cpu_notifier); 2702 2703 cpu_notifier_register_done(); 2704 2705 mutex_unlock(&fcoe_config_mutex); 2706 2707 /* 2708 * destroy_work's may be chained but destroy_workqueue() 2709 * can take care of them. Just kill the fcoe_wq. 2710 */ 2711 destroy_workqueue(fcoe_wq); 2712 2713 /* 2714 * Detaching from the scsi transport must happen after all 2715 * destroys are done on the fcoe_wq. destroy_workqueue will 2716 * enusre the fcoe_wq is flushed. 2717 */ 2718 fcoe_if_exit(); 2719 2720 /* detach from fcoe transport */ 2721 fcoe_transport_detach(&fcoe_sw_transport); 2722 } 2723 module_exit(fcoe_exit); 2724 2725 /** 2726 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler 2727 * @seq: active sequence in the FLOGI or FDISC exchange 2728 * @fp: response frame, or error encoded in a pointer (timeout) 2729 * @arg: pointer the the fcoe_ctlr structure 2730 * 2731 * This handles MAC address management for FCoE, then passes control on to 2732 * the libfc FLOGI response handler. 2733 */ 2734 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2735 { 2736 struct fcoe_ctlr *fip = arg; 2737 struct fc_exch *exch = fc_seq_exch(seq); 2738 struct fc_lport *lport = exch->lp; 2739 u8 *mac; 2740 2741 if (IS_ERR(fp)) 2742 goto done; 2743 2744 mac = fr_cb(fp)->granted_mac; 2745 /* pre-FIP */ 2746 if (is_zero_ether_addr(mac)) 2747 fcoe_ctlr_recv_flogi(fip, lport, fp); 2748 if (!is_zero_ether_addr(mac)) 2749 fcoe_update_src_mac(lport, mac); 2750 done: 2751 fc_lport_flogi_resp(seq, fp, lport); 2752 } 2753 2754 /** 2755 * fcoe_logo_resp() - FCoE specific LOGO response handler 2756 * @seq: active sequence in the LOGO exchange 2757 * @fp: response frame, or error encoded in a pointer (timeout) 2758 * @arg: pointer the the fcoe_ctlr structure 2759 * 2760 * This handles MAC address management for FCoE, then passes control on to 2761 * the libfc LOGO response handler. 2762 */ 2763 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2764 { 2765 struct fc_lport *lport = arg; 2766 static u8 zero_mac[ETH_ALEN] = { 0 }; 2767 2768 if (!IS_ERR(fp)) 2769 fcoe_update_src_mac(lport, zero_mac); 2770 fc_lport_logo_resp(seq, fp, lport); 2771 } 2772 2773 /** 2774 * fcoe_elsct_send - FCoE specific ELS handler 2775 * 2776 * This does special case handling of FIP encapsualted ELS exchanges for FCoE, 2777 * using FCoE specific response handlers and passing the FIP controller as 2778 * the argument (the lport is still available from the exchange). 2779 * 2780 * Most of the work here is just handed off to the libfc routine. 2781 */ 2782 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did, 2783 struct fc_frame *fp, unsigned int op, 2784 void (*resp)(struct fc_seq *, 2785 struct fc_frame *, 2786 void *), 2787 void *arg, u32 timeout) 2788 { 2789 struct fcoe_port *port = lport_priv(lport); 2790 struct fcoe_interface *fcoe = port->priv; 2791 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 2792 struct fc_frame_header *fh = fc_frame_header_get(fp); 2793 2794 switch (op) { 2795 case ELS_FLOGI: 2796 case ELS_FDISC: 2797 if (lport->point_to_multipoint) 2798 break; 2799 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, 2800 fip, timeout); 2801 case ELS_LOGO: 2802 /* only hook onto fabric logouts, not port logouts */ 2803 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) 2804 break; 2805 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, 2806 lport, timeout); 2807 } 2808 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); 2809 } 2810 2811 /** 2812 * fcoe_vport_create() - create an fc_host/scsi_host for a vport 2813 * @vport: fc_vport object to create a new fc_host for 2814 * @disabled: start the new fc_host in a disabled state by default? 2815 * 2816 * Returns: 0 for success 2817 */ 2818 static int fcoe_vport_create(struct fc_vport *vport, bool disabled) 2819 { 2820 struct Scsi_Host *shost = vport_to_shost(vport); 2821 struct fc_lport *n_port = shost_priv(shost); 2822 struct fcoe_port *port = lport_priv(n_port); 2823 struct fcoe_interface *fcoe = port->priv; 2824 struct net_device *netdev = fcoe->netdev; 2825 struct fc_lport *vn_port; 2826 int rc; 2827 char buf[32]; 2828 2829 rc = fcoe_validate_vport_create(vport); 2830 if (rc) { 2831 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf)); 2832 printk(KERN_ERR "fcoe: Failed to create vport, " 2833 "WWPN (0x%s) already exists\n", 2834 buf); 2835 return rc; 2836 } 2837 2838 mutex_lock(&fcoe_config_mutex); 2839 rtnl_lock(); 2840 vn_port = fcoe_if_create(fcoe, &vport->dev, 1); 2841 rtnl_unlock(); 2842 mutex_unlock(&fcoe_config_mutex); 2843 2844 if (IS_ERR(vn_port)) { 2845 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n", 2846 netdev->name); 2847 return -EIO; 2848 } 2849 2850 if (disabled) { 2851 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2852 } else { 2853 vn_port->boot_time = jiffies; 2854 fc_fabric_login(vn_port); 2855 fc_vport_setlink(vn_port); 2856 } 2857 return 0; 2858 } 2859 2860 /** 2861 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport 2862 * @vport: fc_vport object that is being destroyed 2863 * 2864 * Returns: 0 for success 2865 */ 2866 static int fcoe_vport_destroy(struct fc_vport *vport) 2867 { 2868 struct Scsi_Host *shost = vport_to_shost(vport); 2869 struct fc_lport *n_port = shost_priv(shost); 2870 struct fc_lport *vn_port = vport->dd_data; 2871 2872 mutex_lock(&n_port->lp_mutex); 2873 list_del(&vn_port->list); 2874 mutex_unlock(&n_port->lp_mutex); 2875 2876 mutex_lock(&fcoe_config_mutex); 2877 fcoe_if_destroy(vn_port); 2878 mutex_unlock(&fcoe_config_mutex); 2879 2880 return 0; 2881 } 2882 2883 /** 2884 * fcoe_vport_disable() - change vport state 2885 * @vport: vport to bring online/offline 2886 * @disable: should the vport be disabled? 2887 */ 2888 static int fcoe_vport_disable(struct fc_vport *vport, bool disable) 2889 { 2890 struct fc_lport *lport = vport->dd_data; 2891 2892 if (disable) { 2893 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2894 fc_fabric_logoff(lport); 2895 } else { 2896 lport->boot_time = jiffies; 2897 fc_fabric_login(lport); 2898 fc_vport_setlink(lport); 2899 } 2900 2901 return 0; 2902 } 2903 2904 /** 2905 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name 2906 * @vport: fc_vport with a new symbolic name string 2907 * 2908 * After generating a new symbolic name string, a new RSPN_ID request is 2909 * sent to the name server. There is no response handler, so if it fails 2910 * for some reason it will not be retried. 2911 */ 2912 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport) 2913 { 2914 struct fc_lport *lport = vport->dd_data; 2915 struct fc_frame *fp; 2916 size_t len; 2917 2918 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 2919 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION, 2920 fcoe_netdev(lport)->name, vport->symbolic_name); 2921 2922 if (lport->state != LPORT_ST_READY) 2923 return; 2924 2925 len = strnlen(fc_host_symbolic_name(lport->host), 255); 2926 fp = fc_frame_alloc(lport, 2927 sizeof(struct fc_ct_hdr) + 2928 sizeof(struct fc_ns_rspn) + len); 2929 if (!fp) 2930 return; 2931 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID, 2932 NULL, NULL, 3 * lport->r_a_tov); 2933 } 2934 2935 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev) 2936 { 2937 struct fcoe_ctlr_device *ctlr_dev = 2938 fcoe_fcf_dev_to_ctlr_dev(fcf_dev); 2939 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev); 2940 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr); 2941 2942 fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev); 2943 } 2944 2945 /** 2946 * fcoe_set_port_id() - Callback from libfc when Port_ID is set. 2947 * @lport: the local port 2948 * @port_id: the port ID 2949 * @fp: the received frame, if any, that caused the port_id to be set. 2950 * 2951 * This routine handles the case where we received a FLOGI and are 2952 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi() 2953 * so it can set the non-mapped mode and gateway address. 2954 * 2955 * The FLOGI LS_ACC is handled by fcoe_flogi_resp(). 2956 */ 2957 static void fcoe_set_port_id(struct fc_lport *lport, 2958 u32 port_id, struct fc_frame *fp) 2959 { 2960 struct fcoe_port *port = lport_priv(lport); 2961 struct fcoe_interface *fcoe = port->priv; 2962 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2963 2964 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI) 2965 fcoe_ctlr_recv_flogi(ctlr, lport, fp); 2966 } 2967