1 /* 2 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Maintained at www.Open-FCoE.org 18 */ 19 20 #include <linux/module.h> 21 #include <linux/spinlock.h> 22 #include <linux/netdevice.h> 23 #include <linux/etherdevice.h> 24 #include <linux/ethtool.h> 25 #include <linux/if_ether.h> 26 #include <linux/if_vlan.h> 27 #include <linux/crc32.h> 28 #include <linux/slab.h> 29 #include <linux/cpu.h> 30 #include <linux/fs.h> 31 #include <linux/sysfs.h> 32 #include <linux/ctype.h> 33 #include <linux/workqueue.h> 34 #include <net/dcbnl.h> 35 #include <net/dcbevent.h> 36 #include <scsi/scsi_tcq.h> 37 #include <scsi/scsicam.h> 38 #include <scsi/scsi_transport.h> 39 #include <scsi/scsi_transport_fc.h> 40 #include <net/rtnetlink.h> 41 42 #include <scsi/fc/fc_encaps.h> 43 #include <scsi/fc/fc_fip.h> 44 #include <scsi/fc/fc_fcoe.h> 45 46 #include <scsi/libfc.h> 47 #include <scsi/fc_frame.h> 48 #include <scsi/libfcoe.h> 49 50 #include "fcoe.h" 51 52 MODULE_AUTHOR("Open-FCoE.org"); 53 MODULE_DESCRIPTION("FCoE"); 54 MODULE_LICENSE("GPL v2"); 55 56 /* Performance tuning parameters for fcoe */ 57 static unsigned int fcoe_ddp_min = 4096; 58 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR); 59 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ 60 "Direct Data Placement (DDP)."); 61 62 unsigned int fcoe_debug_logging; 63 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR); 64 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 65 66 static DEFINE_MUTEX(fcoe_config_mutex); 67 68 static struct workqueue_struct *fcoe_wq; 69 70 /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */ 71 static DECLARE_COMPLETION(fcoe_flush_completion); 72 73 /* fcoe host list */ 74 /* must only by accessed under the RTNL mutex */ 75 static LIST_HEAD(fcoe_hostlist); 76 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); 77 78 /* Function Prototypes */ 79 static int fcoe_reset(struct Scsi_Host *); 80 static int fcoe_xmit(struct fc_lport *, struct fc_frame *); 81 static int fcoe_rcv(struct sk_buff *, struct net_device *, 82 struct packet_type *, struct net_device *); 83 static int fcoe_percpu_receive_thread(void *); 84 static void fcoe_percpu_clean(struct fc_lport *); 85 static int fcoe_link_ok(struct fc_lport *); 86 87 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); 88 static int fcoe_hostlist_add(const struct fc_lport *); 89 static void fcoe_hostlist_del(const struct fc_lport *); 90 91 static int fcoe_device_notification(struct notifier_block *, ulong, void *); 92 static void fcoe_dev_setup(void); 93 static void fcoe_dev_cleanup(void); 94 static struct fcoe_interface 95 *fcoe_hostlist_lookup_port(const struct net_device *); 96 97 static int fcoe_fip_recv(struct sk_buff *, struct net_device *, 98 struct packet_type *, struct net_device *); 99 100 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *); 101 static void fcoe_update_src_mac(struct fc_lport *, u8 *); 102 static u8 *fcoe_get_src_mac(struct fc_lport *); 103 static void fcoe_destroy_work(struct work_struct *); 104 105 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *, 106 unsigned int); 107 static int fcoe_ddp_done(struct fc_lport *, u16); 108 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *, 109 unsigned int); 110 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *); 111 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 112 ulong event, void *ptr); 113 114 static bool fcoe_match(struct net_device *netdev); 115 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode); 116 static int fcoe_destroy(struct net_device *netdev); 117 static int fcoe_enable(struct net_device *netdev); 118 static int fcoe_disable(struct net_device *netdev); 119 120 /* fcoe_syfs control interface handlers */ 121 static int fcoe_ctlr_alloc(struct net_device *netdev); 122 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev); 123 124 125 static struct fc_seq *fcoe_elsct_send(struct fc_lport *, 126 u32 did, struct fc_frame *, 127 unsigned int op, 128 void (*resp)(struct fc_seq *, 129 struct fc_frame *, 130 void *), 131 void *, u32 timeout); 132 static void fcoe_recv_frame(struct sk_buff *skb); 133 134 /* notification function for packets from net device */ 135 static struct notifier_block fcoe_notifier = { 136 .notifier_call = fcoe_device_notification, 137 }; 138 139 /* notification function for CPU hotplug events */ 140 static struct notifier_block fcoe_cpu_notifier = { 141 .notifier_call = fcoe_cpu_callback, 142 }; 143 144 /* notification function for DCB events */ 145 static struct notifier_block dcb_notifier = { 146 .notifier_call = fcoe_dcb_app_notification, 147 }; 148 149 static struct scsi_transport_template *fcoe_nport_scsi_transport; 150 static struct scsi_transport_template *fcoe_vport_scsi_transport; 151 152 static int fcoe_vport_destroy(struct fc_vport *); 153 static int fcoe_vport_create(struct fc_vport *, bool disabled); 154 static int fcoe_vport_disable(struct fc_vport *, bool disable); 155 static void fcoe_set_vport_symbolic_name(struct fc_vport *); 156 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *); 157 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *); 158 159 static struct fcoe_sysfs_function_template fcoe_sysfs_templ = { 160 .set_fcoe_ctlr_mode = fcoe_ctlr_set_fip_mode, 161 .set_fcoe_ctlr_enabled = fcoe_ctlr_enabled, 162 .get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb, 163 .get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb, 164 .get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb, 165 .get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb, 166 .get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb, 167 .get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb, 168 169 .get_fcoe_fcf_selected = fcoe_fcf_get_selected, 170 .get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id, 171 }; 172 173 static struct libfc_function_template fcoe_libfc_fcn_templ = { 174 .frame_send = fcoe_xmit, 175 .ddp_setup = fcoe_ddp_setup, 176 .ddp_done = fcoe_ddp_done, 177 .ddp_target = fcoe_ddp_target, 178 .elsct_send = fcoe_elsct_send, 179 .get_lesb = fcoe_get_lesb, 180 .lport_set_port_id = fcoe_set_port_id, 181 }; 182 183 static struct fc_function_template fcoe_nport_fc_functions = { 184 .show_host_node_name = 1, 185 .show_host_port_name = 1, 186 .show_host_supported_classes = 1, 187 .show_host_supported_fc4s = 1, 188 .show_host_active_fc4s = 1, 189 .show_host_maxframe_size = 1, 190 .show_host_serial_number = 1, 191 .show_host_manufacturer = 1, 192 .show_host_model = 1, 193 .show_host_model_description = 1, 194 .show_host_hardware_version = 1, 195 .show_host_driver_version = 1, 196 .show_host_firmware_version = 1, 197 .show_host_optionrom_version = 1, 198 199 .show_host_port_id = 1, 200 .show_host_supported_speeds = 1, 201 .get_host_speed = fc_get_host_speed, 202 .show_host_speed = 1, 203 .show_host_port_type = 1, 204 .get_host_port_state = fc_get_host_port_state, 205 .show_host_port_state = 1, 206 .show_host_symbolic_name = 1, 207 208 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), 209 .show_rport_maxframe_size = 1, 210 .show_rport_supported_classes = 1, 211 212 .show_host_fabric_name = 1, 213 .show_starget_node_name = 1, 214 .show_starget_port_name = 1, 215 .show_starget_port_id = 1, 216 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, 217 .show_rport_dev_loss_tmo = 1, 218 .get_fc_host_stats = fc_get_host_stats, 219 .issue_fc_host_lip = fcoe_reset, 220 221 .terminate_rport_io = fc_rport_terminate_io, 222 223 .vport_create = fcoe_vport_create, 224 .vport_delete = fcoe_vport_destroy, 225 .vport_disable = fcoe_vport_disable, 226 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name, 227 228 .bsg_request = fc_lport_bsg_request, 229 }; 230 231 static struct fc_function_template fcoe_vport_fc_functions = { 232 .show_host_node_name = 1, 233 .show_host_port_name = 1, 234 .show_host_supported_classes = 1, 235 .show_host_supported_fc4s = 1, 236 .show_host_active_fc4s = 1, 237 .show_host_maxframe_size = 1, 238 .show_host_serial_number = 1, 239 .show_host_manufacturer = 1, 240 .show_host_model = 1, 241 .show_host_model_description = 1, 242 .show_host_hardware_version = 1, 243 .show_host_driver_version = 1, 244 .show_host_firmware_version = 1, 245 .show_host_optionrom_version = 1, 246 247 .show_host_port_id = 1, 248 .show_host_supported_speeds = 1, 249 .get_host_speed = fc_get_host_speed, 250 .show_host_speed = 1, 251 .show_host_port_type = 1, 252 .get_host_port_state = fc_get_host_port_state, 253 .show_host_port_state = 1, 254 .show_host_symbolic_name = 1, 255 256 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), 257 .show_rport_maxframe_size = 1, 258 .show_rport_supported_classes = 1, 259 260 .show_host_fabric_name = 1, 261 .show_starget_node_name = 1, 262 .show_starget_port_name = 1, 263 .show_starget_port_id = 1, 264 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, 265 .show_rport_dev_loss_tmo = 1, 266 .get_fc_host_stats = fc_get_host_stats, 267 .issue_fc_host_lip = fcoe_reset, 268 269 .terminate_rport_io = fc_rport_terminate_io, 270 271 .bsg_request = fc_lport_bsg_request, 272 }; 273 274 static struct scsi_host_template fcoe_shost_template = { 275 .module = THIS_MODULE, 276 .name = "FCoE Driver", 277 .proc_name = FCOE_NAME, 278 .queuecommand = fc_queuecommand, 279 .eh_abort_handler = fc_eh_abort, 280 .eh_device_reset_handler = fc_eh_device_reset, 281 .eh_host_reset_handler = fc_eh_host_reset, 282 .slave_alloc = fc_slave_alloc, 283 .change_queue_depth = scsi_change_queue_depth, 284 .this_id = -1, 285 .cmd_per_lun = 3, 286 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, 287 .use_clustering = ENABLE_CLUSTERING, 288 .sg_tablesize = SG_ALL, 289 .max_sectors = 0xffff, 290 .track_queue_depth = 1, 291 }; 292 293 /** 294 * fcoe_interface_setup() - Setup a FCoE interface 295 * @fcoe: The new FCoE interface 296 * @netdev: The net device that the fcoe interface is on 297 * 298 * Returns : 0 for success 299 * Locking: must be called with the RTNL mutex held 300 */ 301 static int fcoe_interface_setup(struct fcoe_interface *fcoe, 302 struct net_device *netdev) 303 { 304 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 305 struct netdev_hw_addr *ha; 306 struct net_device *real_dev; 307 u8 flogi_maddr[ETH_ALEN]; 308 const struct net_device_ops *ops; 309 310 fcoe->netdev = netdev; 311 312 /* Let LLD initialize for FCoE */ 313 ops = netdev->netdev_ops; 314 if (ops->ndo_fcoe_enable) { 315 if (ops->ndo_fcoe_enable(netdev)) 316 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" 317 " specific feature for LLD.\n"); 318 } 319 320 /* Do not support for bonding device */ 321 if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) { 322 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n"); 323 return -EOPNOTSUPP; 324 } 325 326 /* look for SAN MAC address, if multiple SAN MACs exist, only 327 * use the first one for SPMA */ 328 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ? 329 vlan_dev_real_dev(netdev) : netdev; 330 fcoe->realdev = real_dev; 331 rcu_read_lock(); 332 for_each_dev_addr(real_dev, ha) { 333 if ((ha->type == NETDEV_HW_ADDR_T_SAN) && 334 (is_valid_ether_addr(ha->addr))) { 335 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); 336 fip->spma = 1; 337 break; 338 } 339 } 340 rcu_read_unlock(); 341 342 /* setup Source Mac Address */ 343 if (!fip->spma) 344 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); 345 346 /* 347 * Add FCoE MAC address as second unicast MAC address 348 * or enter promiscuous mode if not capable of listening 349 * for multiple unicast MACs. 350 */ 351 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 352 dev_uc_add(netdev, flogi_maddr); 353 if (fip->spma) 354 dev_uc_add(netdev, fip->ctl_src_addr); 355 if (fip->mode == FIP_MODE_VN2VN) { 356 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS); 357 dev_mc_add(netdev, FIP_ALL_P2P_MACS); 358 } else 359 dev_mc_add(netdev, FIP_ALL_ENODE_MACS); 360 361 /* 362 * setup the receive function from ethernet driver 363 * on the ethertype for the given device 364 */ 365 fcoe->fcoe_packet_type.func = fcoe_rcv; 366 fcoe->fcoe_packet_type.type = htons(ETH_P_FCOE); 367 fcoe->fcoe_packet_type.dev = netdev; 368 dev_add_pack(&fcoe->fcoe_packet_type); 369 370 fcoe->fip_packet_type.func = fcoe_fip_recv; 371 fcoe->fip_packet_type.type = htons(ETH_P_FIP); 372 fcoe->fip_packet_type.dev = netdev; 373 dev_add_pack(&fcoe->fip_packet_type); 374 375 return 0; 376 } 377 378 /** 379 * fcoe_interface_create() - Create a FCoE interface on a net device 380 * @netdev: The net device to create the FCoE interface on 381 * @fip_mode: The mode to use for FIP 382 * 383 * Returns: pointer to a struct fcoe_interface or NULL on error 384 */ 385 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev, 386 enum fip_state fip_mode) 387 { 388 struct fcoe_ctlr_device *ctlr_dev; 389 struct fcoe_ctlr *ctlr; 390 struct fcoe_interface *fcoe; 391 int size; 392 int err; 393 394 if (!try_module_get(THIS_MODULE)) { 395 FCOE_NETDEV_DBG(netdev, 396 "Could not get a reference to the module\n"); 397 fcoe = ERR_PTR(-EBUSY); 398 goto out; 399 } 400 401 size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface); 402 ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ, 403 size); 404 if (!ctlr_dev) { 405 FCOE_DBG("Failed to add fcoe_ctlr_device\n"); 406 fcoe = ERR_PTR(-ENOMEM); 407 goto out_putmod; 408 } 409 410 ctlr = fcoe_ctlr_device_priv(ctlr_dev); 411 ctlr->cdev = ctlr_dev; 412 fcoe = fcoe_ctlr_priv(ctlr); 413 414 dev_hold(netdev); 415 416 /* 417 * Initialize FIP. 418 */ 419 fcoe_ctlr_init(ctlr, fip_mode); 420 ctlr->send = fcoe_fip_send; 421 ctlr->update_mac = fcoe_update_src_mac; 422 ctlr->get_src_addr = fcoe_get_src_mac; 423 424 err = fcoe_interface_setup(fcoe, netdev); 425 if (err) { 426 fcoe_ctlr_destroy(ctlr); 427 fcoe_ctlr_device_delete(ctlr_dev); 428 dev_put(netdev); 429 fcoe = ERR_PTR(err); 430 goto out_putmod; 431 } 432 433 goto out; 434 435 out_putmod: 436 module_put(THIS_MODULE); 437 out: 438 return fcoe; 439 } 440 441 /** 442 * fcoe_interface_remove() - remove FCoE interface from netdev 443 * @fcoe: The FCoE interface to be cleaned up 444 * 445 * Caller must be holding the RTNL mutex 446 */ 447 static void fcoe_interface_remove(struct fcoe_interface *fcoe) 448 { 449 struct net_device *netdev = fcoe->netdev; 450 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 451 u8 flogi_maddr[ETH_ALEN]; 452 const struct net_device_ops *ops; 453 454 /* 455 * Don't listen for Ethernet packets anymore. 456 * synchronize_net() ensures that the packet handlers are not running 457 * on another CPU. dev_remove_pack() would do that, this calls the 458 * unsyncronized version __dev_remove_pack() to avoid multiple delays. 459 */ 460 __dev_remove_pack(&fcoe->fcoe_packet_type); 461 __dev_remove_pack(&fcoe->fip_packet_type); 462 synchronize_net(); 463 464 /* Delete secondary MAC addresses */ 465 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 466 dev_uc_del(netdev, flogi_maddr); 467 if (fip->spma) 468 dev_uc_del(netdev, fip->ctl_src_addr); 469 if (fip->mode == FIP_MODE_VN2VN) { 470 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS); 471 dev_mc_del(netdev, FIP_ALL_P2P_MACS); 472 } else 473 dev_mc_del(netdev, FIP_ALL_ENODE_MACS); 474 475 /* Tell the LLD we are done w/ FCoE */ 476 ops = netdev->netdev_ops; 477 if (ops->ndo_fcoe_disable) { 478 if (ops->ndo_fcoe_disable(netdev)) 479 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" 480 " specific feature for LLD.\n"); 481 } 482 fcoe->removed = 1; 483 } 484 485 486 /** 487 * fcoe_interface_cleanup() - Clean up a FCoE interface 488 * @fcoe: The FCoE interface to be cleaned up 489 */ 490 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe) 491 { 492 struct net_device *netdev = fcoe->netdev; 493 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 494 495 rtnl_lock(); 496 if (!fcoe->removed) 497 fcoe_interface_remove(fcoe); 498 rtnl_unlock(); 499 500 /* Release the self-reference taken during fcoe_interface_create() */ 501 /* tear-down the FCoE controller */ 502 fcoe_ctlr_destroy(fip); 503 scsi_host_put(fip->lp->host); 504 dev_put(netdev); 505 module_put(THIS_MODULE); 506 } 507 508 /** 509 * fcoe_fip_recv() - Handler for received FIP frames 510 * @skb: The receive skb 511 * @netdev: The associated net device 512 * @ptype: The packet_type structure which was used to register this handler 513 * @orig_dev: The original net_device the the skb was received on. 514 * (in case dev is a bond) 515 * 516 * Returns: 0 for success 517 */ 518 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev, 519 struct packet_type *ptype, 520 struct net_device *orig_dev) 521 { 522 struct fcoe_interface *fcoe; 523 struct fcoe_ctlr *ctlr; 524 525 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); 526 ctlr = fcoe_to_ctlr(fcoe); 527 fcoe_ctlr_recv(ctlr, skb); 528 return 0; 529 } 530 531 /** 532 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame 533 * @port: The FCoE port 534 * @skb: The FIP/FCoE packet to be sent 535 */ 536 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb) 537 { 538 if (port->fcoe_pending_queue.qlen) 539 fcoe_check_wait_queue(port->lport, skb); 540 else if (fcoe_start_io(skb)) 541 fcoe_check_wait_queue(port->lport, skb); 542 } 543 544 /** 545 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame 546 * @fip: The FCoE controller 547 * @skb: The FIP packet to be sent 548 */ 549 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 550 { 551 skb->dev = fcoe_from_ctlr(fip)->netdev; 552 fcoe_port_send(lport_priv(fip->lp), skb); 553 } 554 555 /** 556 * fcoe_update_src_mac() - Update the Ethernet MAC filters 557 * @lport: The local port to update the source MAC on 558 * @addr: Unicast MAC address to add 559 * 560 * Remove any previously-set unicast MAC filter. 561 * Add secondary FCoE MAC address filter for our OUI. 562 */ 563 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) 564 { 565 struct fcoe_port *port = lport_priv(lport); 566 struct fcoe_interface *fcoe = port->priv; 567 568 if (!is_zero_ether_addr(port->data_src_addr)) 569 dev_uc_del(fcoe->netdev, port->data_src_addr); 570 if (!is_zero_ether_addr(addr)) 571 dev_uc_add(fcoe->netdev, addr); 572 memcpy(port->data_src_addr, addr, ETH_ALEN); 573 } 574 575 /** 576 * fcoe_get_src_mac() - return the Ethernet source address for an lport 577 * @lport: libfc lport 578 */ 579 static u8 *fcoe_get_src_mac(struct fc_lport *lport) 580 { 581 struct fcoe_port *port = lport_priv(lport); 582 583 return port->data_src_addr; 584 } 585 586 /** 587 * fcoe_lport_config() - Set up a local port 588 * @lport: The local port to be setup 589 * 590 * Returns: 0 for success 591 */ 592 static int fcoe_lport_config(struct fc_lport *lport) 593 { 594 lport->link_up = 0; 595 lport->qfull = 0; 596 lport->max_retry_count = 3; 597 lport->max_rport_retry_count = 3; 598 lport->e_d_tov = 2 * 1000; /* FC-FS default */ 599 lport->r_a_tov = 2 * 2 * 1000; 600 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | 601 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); 602 lport->does_npiv = 1; 603 604 fc_lport_init_stats(lport); 605 606 /* lport fc_lport related configuration */ 607 fc_lport_config(lport); 608 609 /* offload related configuration */ 610 lport->crc_offload = 0; 611 lport->seq_offload = 0; 612 lport->lro_enabled = 0; 613 lport->lro_xid = 0; 614 lport->lso_max = 0; 615 616 return 0; 617 } 618 619 /** 620 * fcoe_netdev_features_change - Updates the lport's offload flags based 621 * on the LLD netdev's FCoE feature flags 622 */ 623 static void fcoe_netdev_features_change(struct fc_lport *lport, 624 struct net_device *netdev) 625 { 626 mutex_lock(&lport->lp_mutex); 627 628 if (netdev->features & NETIF_F_SG) 629 lport->sg_supp = 1; 630 else 631 lport->sg_supp = 0; 632 633 if (netdev->features & NETIF_F_FCOE_CRC) { 634 lport->crc_offload = 1; 635 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); 636 } else { 637 lport->crc_offload = 0; 638 } 639 640 if (netdev->features & NETIF_F_FSO) { 641 lport->seq_offload = 1; 642 lport->lso_max = netdev->gso_max_size; 643 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", 644 lport->lso_max); 645 } else { 646 lport->seq_offload = 0; 647 lport->lso_max = 0; 648 } 649 650 if (netdev->fcoe_ddp_xid) { 651 lport->lro_enabled = 1; 652 lport->lro_xid = netdev->fcoe_ddp_xid; 653 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", 654 lport->lro_xid); 655 } else { 656 lport->lro_enabled = 0; 657 lport->lro_xid = 0; 658 } 659 660 mutex_unlock(&lport->lp_mutex); 661 } 662 663 /** 664 * fcoe_netdev_config() - Set up net devive for SW FCoE 665 * @lport: The local port that is associated with the net device 666 * @netdev: The associated net device 667 * 668 * Must be called after fcoe_lport_config() as it will use local port mutex 669 * 670 * Returns: 0 for success 671 */ 672 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev) 673 { 674 u32 mfs; 675 u64 wwnn, wwpn; 676 struct fcoe_interface *fcoe; 677 struct fcoe_ctlr *ctlr; 678 struct fcoe_port *port; 679 680 /* Setup lport private data to point to fcoe softc */ 681 port = lport_priv(lport); 682 fcoe = port->priv; 683 ctlr = fcoe_to_ctlr(fcoe); 684 685 /* 686 * Determine max frame size based on underlying device and optional 687 * user-configured limit. If the MFS is too low, fcoe_link_ok() 688 * will return 0, so do this first. 689 */ 690 mfs = netdev->mtu; 691 if (netdev->features & NETIF_F_FCOE_MTU) { 692 mfs = FCOE_MTU; 693 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); 694 } 695 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); 696 if (fc_set_mfs(lport, mfs)) 697 return -EINVAL; 698 699 /* offload features support */ 700 fcoe_netdev_features_change(lport, netdev); 701 702 skb_queue_head_init(&port->fcoe_pending_queue); 703 port->fcoe_pending_queue_active = 0; 704 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); 705 706 fcoe_link_speed_update(lport); 707 708 if (!lport->vport) { 709 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN)) 710 wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0); 711 fc_set_wwnn(lport, wwnn); 712 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN)) 713 wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 714 2, 0); 715 fc_set_wwpn(lport, wwpn); 716 } 717 718 return 0; 719 } 720 721 /** 722 * fcoe_shost_config() - Set up the SCSI host associated with a local port 723 * @lport: The local port 724 * @dev: The device associated with the SCSI host 725 * 726 * Must be called after fcoe_lport_config() and fcoe_netdev_config() 727 * 728 * Returns: 0 for success 729 */ 730 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev) 731 { 732 int rc = 0; 733 734 /* lport scsi host config */ 735 lport->host->max_lun = FCOE_MAX_LUN; 736 lport->host->max_id = FCOE_MAX_FCP_TARGET; 737 lport->host->max_channel = 0; 738 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN; 739 740 if (lport->vport) 741 lport->host->transportt = fcoe_vport_scsi_transport; 742 else 743 lport->host->transportt = fcoe_nport_scsi_transport; 744 745 /* add the new host to the SCSI-ml */ 746 rc = scsi_add_host(lport->host, dev); 747 if (rc) { 748 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " 749 "error on scsi_add_host\n"); 750 return rc; 751 } 752 753 if (!lport->vport) 754 fc_host_max_npiv_vports(lport->host) = USHRT_MAX; 755 756 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 757 "%s v%s over %s", FCOE_NAME, FCOE_VERSION, 758 fcoe_netdev(lport)->name); 759 760 return 0; 761 } 762 763 764 /** 765 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE 766 * @lport: The local port that is associated with the net device 767 * @netdev: The associated net device 768 * 769 * Must be called after fcoe_shost_config() as it will use local port mutex 770 * 771 */ 772 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev) 773 { 774 struct fcoe_interface *fcoe; 775 struct fcoe_port *port; 776 struct net_device *realdev; 777 int rc; 778 779 port = lport_priv(lport); 780 fcoe = port->priv; 781 realdev = fcoe->realdev; 782 783 if (!realdev) 784 return; 785 786 /* No FDMI state m/c for NPIV ports */ 787 if (lport->vport) 788 return; 789 790 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) { 791 struct netdev_fcoe_hbainfo *fdmi; 792 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL); 793 if (!fdmi) 794 return; 795 796 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev, 797 fdmi); 798 if (rc) { 799 printk(KERN_INFO "fcoe: Failed to retrieve FDMI " 800 "information from netdev.\n"); 801 return; 802 } 803 804 snprintf(fc_host_serial_number(lport->host), 805 FC_SERIAL_NUMBER_SIZE, 806 "%s", 807 fdmi->serial_number); 808 snprintf(fc_host_manufacturer(lport->host), 809 FC_SERIAL_NUMBER_SIZE, 810 "%s", 811 fdmi->manufacturer); 812 snprintf(fc_host_model(lport->host), 813 FC_SYMBOLIC_NAME_SIZE, 814 "%s", 815 fdmi->model); 816 snprintf(fc_host_model_description(lport->host), 817 FC_SYMBOLIC_NAME_SIZE, 818 "%s", 819 fdmi->model_description); 820 snprintf(fc_host_hardware_version(lport->host), 821 FC_VERSION_STRING_SIZE, 822 "%s", 823 fdmi->hardware_version); 824 snprintf(fc_host_driver_version(lport->host), 825 FC_VERSION_STRING_SIZE, 826 "%s", 827 fdmi->driver_version); 828 snprintf(fc_host_optionrom_version(lport->host), 829 FC_VERSION_STRING_SIZE, 830 "%s", 831 fdmi->optionrom_version); 832 snprintf(fc_host_firmware_version(lport->host), 833 FC_VERSION_STRING_SIZE, 834 "%s", 835 fdmi->firmware_version); 836 837 /* Enable FDMI lport states */ 838 lport->fdmi_enabled = 1; 839 kfree(fdmi); 840 } else { 841 lport->fdmi_enabled = 0; 842 printk(KERN_INFO "fcoe: No FDMI support.\n"); 843 } 844 } 845 846 /** 847 * fcoe_oem_match() - The match routine for the offloaded exchange manager 848 * @fp: The I/O frame 849 * 850 * This routine will be associated with an exchange manager (EM). When 851 * the libfc exchange handling code is looking for an EM to use it will 852 * call this routine and pass it the frame that it wishes to send. This 853 * routine will return True if the associated EM is to be used and False 854 * if the echange code should continue looking for an EM. 855 * 856 * The offload EM that this routine is associated with will handle any 857 * packets that are for SCSI read requests. 858 * 859 * This has been enhanced to work when FCoE stack is operating in target 860 * mode. 861 * 862 * Returns: True for read types I/O, otherwise returns false. 863 */ 864 static bool fcoe_oem_match(struct fc_frame *fp) 865 { 866 struct fc_frame_header *fh = fc_frame_header_get(fp); 867 struct fcp_cmnd *fcp; 868 869 if (fc_fcp_is_read(fr_fsp(fp)) && 870 (fr_fsp(fp)->data_len > fcoe_ddp_min)) 871 return true; 872 else if ((fr_fsp(fp) == NULL) && 873 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) && 874 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { 875 fcp = fc_frame_payload_get(fp, sizeof(*fcp)); 876 if ((fcp->fc_flags & FCP_CFL_WRDATA) && 877 (ntohl(fcp->fc_dl) > fcoe_ddp_min)) 878 return true; 879 } 880 return false; 881 } 882 883 /** 884 * fcoe_em_config() - Allocate and configure an exchange manager 885 * @lport: The local port that the new EM will be associated with 886 * 887 * Returns: 0 on success 888 */ 889 static inline int fcoe_em_config(struct fc_lport *lport) 890 { 891 struct fcoe_port *port = lport_priv(lport); 892 struct fcoe_interface *fcoe = port->priv; 893 struct fcoe_interface *oldfcoe = NULL; 894 struct net_device *old_real_dev, *cur_real_dev; 895 u16 min_xid = FCOE_MIN_XID; 896 u16 max_xid = FCOE_MAX_XID; 897 898 /* 899 * Check if need to allocate an em instance for 900 * offload exchange ids to be shared across all VN_PORTs/lport. 901 */ 902 if (!lport->lro_enabled || !lport->lro_xid || 903 (lport->lro_xid >= max_xid)) { 904 lport->lro_xid = 0; 905 goto skip_oem; 906 } 907 908 /* 909 * Reuse existing offload em instance in case 910 * it is already allocated on real eth device 911 */ 912 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 913 cur_real_dev = vlan_dev_real_dev(fcoe->netdev); 914 else 915 cur_real_dev = fcoe->netdev; 916 917 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { 918 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 919 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); 920 else 921 old_real_dev = oldfcoe->netdev; 922 923 if (cur_real_dev == old_real_dev) { 924 fcoe->oem = oldfcoe->oem; 925 break; 926 } 927 } 928 929 if (fcoe->oem) { 930 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) { 931 printk(KERN_ERR "fcoe_em_config: failed to add " 932 "offload em:%p on interface:%s\n", 933 fcoe->oem, fcoe->netdev->name); 934 return -ENOMEM; 935 } 936 } else { 937 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3, 938 FCOE_MIN_XID, lport->lro_xid, 939 fcoe_oem_match); 940 if (!fcoe->oem) { 941 printk(KERN_ERR "fcoe_em_config: failed to allocate " 942 "em for offload exches on interface:%s\n", 943 fcoe->netdev->name); 944 return -ENOMEM; 945 } 946 } 947 948 /* 949 * Exclude offload EM xid range from next EM xid range. 950 */ 951 min_xid += lport->lro_xid + 1; 952 953 skip_oem: 954 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) { 955 printk(KERN_ERR "fcoe_em_config: failed to " 956 "allocate em on interface %s\n", fcoe->netdev->name); 957 return -ENOMEM; 958 } 959 960 return 0; 961 } 962 963 /** 964 * fcoe_if_destroy() - Tear down a SW FCoE instance 965 * @lport: The local port to be destroyed 966 * 967 */ 968 static void fcoe_if_destroy(struct fc_lport *lport) 969 { 970 struct fcoe_port *port = lport_priv(lport); 971 struct fcoe_interface *fcoe = port->priv; 972 struct net_device *netdev = fcoe->netdev; 973 974 FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); 975 976 /* Logout of the fabric */ 977 fc_fabric_logoff(lport); 978 979 /* Cleanup the fc_lport */ 980 fc_lport_destroy(lport); 981 982 /* Stop the transmit retry timer */ 983 del_timer_sync(&port->timer); 984 985 /* Free existing transmit skbs */ 986 fcoe_clean_pending_queue(lport); 987 988 rtnl_lock(); 989 if (!is_zero_ether_addr(port->data_src_addr)) 990 dev_uc_del(netdev, port->data_src_addr); 991 if (lport->vport) 992 synchronize_net(); 993 else 994 fcoe_interface_remove(fcoe); 995 rtnl_unlock(); 996 997 /* Free queued packets for the per-CPU receive threads */ 998 fcoe_percpu_clean(lport); 999 1000 /* Detach from the scsi-ml */ 1001 fc_remove_host(lport->host); 1002 scsi_remove_host(lport->host); 1003 1004 /* Destroy lport scsi_priv */ 1005 fc_fcp_destroy(lport); 1006 1007 /* There are no more rports or I/O, free the EM */ 1008 fc_exch_mgr_free(lport); 1009 1010 /* Free memory used by statistical counters */ 1011 fc_lport_free_stats(lport); 1012 1013 /* 1014 * Release the Scsi_Host for vport but hold on to 1015 * master lport until it fcoe interface fully cleaned-up. 1016 */ 1017 if (lport->vport) 1018 scsi_host_put(lport->host); 1019 } 1020 1021 /** 1022 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device 1023 * @lport: The local port to setup DDP for 1024 * @xid: The exchange ID for this DDP transfer 1025 * @sgl: The scatterlist describing this transfer 1026 * @sgc: The number of sg items 1027 * 1028 * Returns: 0 if the DDP context was not configured 1029 */ 1030 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid, 1031 struct scatterlist *sgl, unsigned int sgc) 1032 { 1033 struct net_device *netdev = fcoe_netdev(lport); 1034 1035 if (netdev->netdev_ops->ndo_fcoe_ddp_setup) 1036 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev, 1037 xid, sgl, 1038 sgc); 1039 1040 return 0; 1041 } 1042 1043 /** 1044 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device 1045 * @lport: The local port to setup DDP for 1046 * @xid: The exchange ID for this DDP transfer 1047 * @sgl: The scatterlist describing this transfer 1048 * @sgc: The number of sg items 1049 * 1050 * Returns: 0 if the DDP context was not configured 1051 */ 1052 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid, 1053 struct scatterlist *sgl, unsigned int sgc) 1054 { 1055 struct net_device *netdev = fcoe_netdev(lport); 1056 1057 if (netdev->netdev_ops->ndo_fcoe_ddp_target) 1058 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid, 1059 sgl, sgc); 1060 1061 return 0; 1062 } 1063 1064 1065 /** 1066 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device 1067 * @lport: The local port to complete DDP on 1068 * @xid: The exchange ID for this DDP transfer 1069 * 1070 * Returns: the length of data that have been completed by DDP 1071 */ 1072 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid) 1073 { 1074 struct net_device *netdev = fcoe_netdev(lport); 1075 1076 if (netdev->netdev_ops->ndo_fcoe_ddp_done) 1077 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid); 1078 return 0; 1079 } 1080 1081 /** 1082 * fcoe_if_create() - Create a FCoE instance on an interface 1083 * @fcoe: The FCoE interface to create a local port on 1084 * @parent: The device pointer to be the parent in sysfs for the SCSI host 1085 * @npiv: Indicates if the port is a vport or not 1086 * 1087 * Creates a fc_lport instance and a Scsi_Host instance and configure them. 1088 * 1089 * Returns: The allocated fc_lport or an error pointer 1090 */ 1091 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, 1092 struct device *parent, int npiv) 1093 { 1094 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1095 struct net_device *netdev = fcoe->netdev; 1096 struct fc_lport *lport, *n_port; 1097 struct fcoe_port *port; 1098 struct Scsi_Host *shost; 1099 int rc; 1100 /* 1101 * parent is only a vport if npiv is 1, 1102 * but we'll only use vport in that case so go ahead and set it 1103 */ 1104 struct fc_vport *vport = dev_to_vport(parent); 1105 1106 FCOE_NETDEV_DBG(netdev, "Create Interface\n"); 1107 1108 if (!npiv) 1109 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port)); 1110 else 1111 lport = libfc_vport_create(vport, sizeof(*port)); 1112 1113 if (!lport) { 1114 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); 1115 rc = -ENOMEM; 1116 goto out; 1117 } 1118 port = lport_priv(lport); 1119 port->lport = lport; 1120 port->priv = fcoe; 1121 port->get_netdev = fcoe_netdev; 1122 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH; 1123 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH; 1124 INIT_WORK(&port->destroy_work, fcoe_destroy_work); 1125 1126 /* 1127 * Need to add the lport to the hostlist 1128 * so we catch NETDEV_CHANGE events. 1129 */ 1130 fcoe_hostlist_add(lport); 1131 1132 /* configure a fc_lport including the exchange manager */ 1133 rc = fcoe_lport_config(lport); 1134 if (rc) { 1135 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " 1136 "interface\n"); 1137 goto out_host_put; 1138 } 1139 1140 if (npiv) { 1141 FCOE_NETDEV_DBG(netdev, "Setting vport names, " 1142 "%16.16llx %16.16llx\n", 1143 vport->node_name, vport->port_name); 1144 fc_set_wwnn(lport, vport->node_name); 1145 fc_set_wwpn(lport, vport->port_name); 1146 } 1147 1148 /* configure lport network properties */ 1149 rc = fcoe_netdev_config(lport, netdev); 1150 if (rc) { 1151 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " 1152 "interface\n"); 1153 goto out_lp_destroy; 1154 } 1155 1156 /* configure lport scsi host properties */ 1157 rc = fcoe_shost_config(lport, parent); 1158 if (rc) { 1159 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " 1160 "interface\n"); 1161 goto out_lp_destroy; 1162 } 1163 1164 /* Initialize the library */ 1165 rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1); 1166 if (rc) { 1167 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " 1168 "interface\n"); 1169 goto out_lp_destroy; 1170 } 1171 1172 /* Initialized FDMI information */ 1173 fcoe_fdmi_info(lport, netdev); 1174 1175 /* 1176 * fcoe_em_alloc() and fcoe_hostlist_add() both 1177 * need to be atomic with respect to other changes to the 1178 * hostlist since fcoe_em_alloc() looks for an existing EM 1179 * instance on host list updated by fcoe_hostlist_add(). 1180 * 1181 * This is currently handled through the fcoe_config_mutex 1182 * begin held. 1183 */ 1184 if (!npiv) 1185 /* lport exch manager allocation */ 1186 rc = fcoe_em_config(lport); 1187 else { 1188 shost = vport_to_shost(vport); 1189 n_port = shost_priv(shost); 1190 rc = fc_exch_mgr_list_clone(n_port, lport); 1191 } 1192 1193 if (rc) { 1194 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n"); 1195 goto out_lp_destroy; 1196 } 1197 1198 return lport; 1199 1200 out_lp_destroy: 1201 fc_exch_mgr_free(lport); 1202 out_host_put: 1203 fcoe_hostlist_del(lport); 1204 scsi_host_put(lport->host); 1205 out: 1206 return ERR_PTR(rc); 1207 } 1208 1209 /** 1210 * fcoe_if_init() - Initialization routine for fcoe.ko 1211 * 1212 * Attaches the SW FCoE transport to the FC transport 1213 * 1214 * Returns: 0 on success 1215 */ 1216 static int __init fcoe_if_init(void) 1217 { 1218 /* attach to scsi transport */ 1219 fcoe_nport_scsi_transport = 1220 fc_attach_transport(&fcoe_nport_fc_functions); 1221 fcoe_vport_scsi_transport = 1222 fc_attach_transport(&fcoe_vport_fc_functions); 1223 1224 if (!fcoe_nport_scsi_transport) { 1225 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); 1226 return -ENODEV; 1227 } 1228 1229 return 0; 1230 } 1231 1232 /** 1233 * fcoe_if_exit() - Tear down fcoe.ko 1234 * 1235 * Detaches the SW FCoE transport from the FC transport 1236 * 1237 * Returns: 0 on success 1238 */ 1239 static int __exit fcoe_if_exit(void) 1240 { 1241 fc_release_transport(fcoe_nport_scsi_transport); 1242 fc_release_transport(fcoe_vport_scsi_transport); 1243 fcoe_nport_scsi_transport = NULL; 1244 fcoe_vport_scsi_transport = NULL; 1245 return 0; 1246 } 1247 1248 /** 1249 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU 1250 * @cpu: The CPU index of the CPU to create a receive thread for 1251 */ 1252 static void fcoe_percpu_thread_create(unsigned int cpu) 1253 { 1254 struct fcoe_percpu_s *p; 1255 struct task_struct *thread; 1256 1257 p = &per_cpu(fcoe_percpu, cpu); 1258 1259 thread = kthread_create_on_node(fcoe_percpu_receive_thread, 1260 (void *)p, cpu_to_node(cpu), 1261 "fcoethread/%d", cpu); 1262 1263 if (likely(!IS_ERR(thread))) { 1264 kthread_bind(thread, cpu); 1265 wake_up_process(thread); 1266 1267 spin_lock_bh(&p->fcoe_rx_list.lock); 1268 p->thread = thread; 1269 spin_unlock_bh(&p->fcoe_rx_list.lock); 1270 } 1271 } 1272 1273 /** 1274 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU 1275 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed 1276 * 1277 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the 1278 * current CPU's Rx thread. If the thread being destroyed is bound to 1279 * the CPU processing this context the skbs will be freed. 1280 */ 1281 static void fcoe_percpu_thread_destroy(unsigned int cpu) 1282 { 1283 struct fcoe_percpu_s *p; 1284 struct task_struct *thread; 1285 struct page *crc_eof; 1286 struct sk_buff *skb; 1287 #ifdef CONFIG_SMP 1288 struct fcoe_percpu_s *p0; 1289 unsigned targ_cpu = get_cpu(); 1290 #endif /* CONFIG_SMP */ 1291 1292 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); 1293 1294 /* Prevent any new skbs from being queued for this CPU. */ 1295 p = &per_cpu(fcoe_percpu, cpu); 1296 spin_lock_bh(&p->fcoe_rx_list.lock); 1297 thread = p->thread; 1298 p->thread = NULL; 1299 crc_eof = p->crc_eof_page; 1300 p->crc_eof_page = NULL; 1301 p->crc_eof_offset = 0; 1302 spin_unlock_bh(&p->fcoe_rx_list.lock); 1303 1304 #ifdef CONFIG_SMP 1305 /* 1306 * Don't bother moving the skb's if this context is running 1307 * on the same CPU that is having its thread destroyed. This 1308 * can easily happen when the module is removed. 1309 */ 1310 if (cpu != targ_cpu) { 1311 p0 = &per_cpu(fcoe_percpu, targ_cpu); 1312 spin_lock_bh(&p0->fcoe_rx_list.lock); 1313 if (p0->thread) { 1314 FCOE_DBG("Moving frames from CPU %d to CPU %d\n", 1315 cpu, targ_cpu); 1316 1317 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1318 __skb_queue_tail(&p0->fcoe_rx_list, skb); 1319 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1320 } else { 1321 /* 1322 * The targeted CPU is not initialized and cannot accept 1323 * new skbs. Unlock the targeted CPU and drop the skbs 1324 * on the CPU that is going offline. 1325 */ 1326 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1327 kfree_skb(skb); 1328 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1329 } 1330 } else { 1331 /* 1332 * This scenario occurs when the module is being removed 1333 * and all threads are being destroyed. skbs will continue 1334 * to be shifted from the CPU thread that is being removed 1335 * to the CPU thread associated with the CPU that is processing 1336 * the module removal. Once there is only one CPU Rx thread it 1337 * will reach this case and we will drop all skbs and later 1338 * stop the thread. 1339 */ 1340 spin_lock_bh(&p->fcoe_rx_list.lock); 1341 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1342 kfree_skb(skb); 1343 spin_unlock_bh(&p->fcoe_rx_list.lock); 1344 } 1345 put_cpu(); 1346 #else 1347 /* 1348 * This a non-SMP scenario where the singular Rx thread is 1349 * being removed. Free all skbs and stop the thread. 1350 */ 1351 spin_lock_bh(&p->fcoe_rx_list.lock); 1352 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1353 kfree_skb(skb); 1354 spin_unlock_bh(&p->fcoe_rx_list.lock); 1355 #endif 1356 1357 if (thread) 1358 kthread_stop(thread); 1359 1360 if (crc_eof) 1361 put_page(crc_eof); 1362 } 1363 1364 /** 1365 * fcoe_cpu_callback() - Handler for CPU hotplug events 1366 * @nfb: The callback data block 1367 * @action: The event triggering the callback 1368 * @hcpu: The index of the CPU that the event is for 1369 * 1370 * This creates or destroys per-CPU data for fcoe 1371 * 1372 * Returns NOTIFY_OK always. 1373 */ 1374 static int fcoe_cpu_callback(struct notifier_block *nfb, 1375 unsigned long action, void *hcpu) 1376 { 1377 unsigned cpu = (unsigned long)hcpu; 1378 1379 switch (action) { 1380 case CPU_ONLINE: 1381 case CPU_ONLINE_FROZEN: 1382 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); 1383 fcoe_percpu_thread_create(cpu); 1384 break; 1385 case CPU_DEAD: 1386 case CPU_DEAD_FROZEN: 1387 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); 1388 fcoe_percpu_thread_destroy(cpu); 1389 break; 1390 default: 1391 break; 1392 } 1393 return NOTIFY_OK; 1394 } 1395 1396 /** 1397 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming 1398 * command. 1399 * 1400 * This routine selects next CPU based on cpumask to distribute 1401 * incoming requests in round robin. 1402 * 1403 * Returns: int CPU number 1404 */ 1405 static inline unsigned int fcoe_select_cpu(void) 1406 { 1407 static unsigned int selected_cpu; 1408 1409 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); 1410 if (selected_cpu >= nr_cpu_ids) 1411 selected_cpu = cpumask_first(cpu_online_mask); 1412 1413 return selected_cpu; 1414 } 1415 1416 /** 1417 * fcoe_rcv() - Receive packets from a net device 1418 * @skb: The received packet 1419 * @netdev: The net device that the packet was received on 1420 * @ptype: The packet type context 1421 * @olddev: The last device net device 1422 * 1423 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a 1424 * FC frame and passes the frame to libfc. 1425 * 1426 * Returns: 0 for success 1427 */ 1428 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, 1429 struct packet_type *ptype, struct net_device *olddev) 1430 { 1431 struct fc_lport *lport; 1432 struct fcoe_rcv_info *fr; 1433 struct fcoe_ctlr *ctlr; 1434 struct fcoe_interface *fcoe; 1435 struct fc_frame_header *fh; 1436 struct fcoe_percpu_s *fps; 1437 struct ethhdr *eh; 1438 unsigned int cpu; 1439 1440 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); 1441 ctlr = fcoe_to_ctlr(fcoe); 1442 lport = ctlr->lp; 1443 if (unlikely(!lport)) { 1444 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n"); 1445 goto err2; 1446 } 1447 if (!lport->link_up) 1448 goto err2; 1449 1450 FCOE_NETDEV_DBG(netdev, 1451 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n", 1452 skb->len, skb->data_len, skb->head, skb->data, 1453 skb_tail_pointer(skb), skb_end_pointer(skb), 1454 skb->csum, skb->dev ? skb->dev->name : "<NULL>"); 1455 1456 1457 skb = skb_share_check(skb, GFP_ATOMIC); 1458 1459 if (skb == NULL) 1460 return NET_RX_DROP; 1461 1462 eh = eth_hdr(skb); 1463 1464 if (is_fip_mode(ctlr) && 1465 !ether_addr_equal(eh->h_source, ctlr->dest_addr)) { 1466 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n", 1467 eh->h_source); 1468 goto err; 1469 } 1470 1471 /* 1472 * Check for minimum frame length, and make sure required FCoE 1473 * and FC headers are pulled into the linear data area. 1474 */ 1475 if (unlikely((skb->len < FCOE_MIN_FRAME) || 1476 !pskb_may_pull(skb, FCOE_HEADER_LEN))) 1477 goto err; 1478 1479 skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); 1480 fh = (struct fc_frame_header *) skb_transport_header(skb); 1481 1482 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) { 1483 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n", 1484 eh->h_dest); 1485 goto err; 1486 } 1487 1488 fr = fcoe_dev_from_skb(skb); 1489 fr->fr_dev = lport; 1490 1491 /* 1492 * In case the incoming frame's exchange is originated from 1493 * the initiator, then received frame's exchange id is ANDed 1494 * with fc_cpu_mask bits to get the same cpu on which exchange 1495 * was originated, otherwise select cpu using rx exchange id 1496 * or fcoe_select_cpu(). 1497 */ 1498 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) 1499 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; 1500 else { 1501 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN) 1502 cpu = fcoe_select_cpu(); 1503 else 1504 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask; 1505 } 1506 1507 if (cpu >= nr_cpu_ids) 1508 goto err; 1509 1510 fps = &per_cpu(fcoe_percpu, cpu); 1511 spin_lock(&fps->fcoe_rx_list.lock); 1512 if (unlikely(!fps->thread)) { 1513 /* 1514 * The targeted CPU is not ready, let's target 1515 * the first CPU now. For non-SMP systems this 1516 * will check the same CPU twice. 1517 */ 1518 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread " 1519 "ready for incoming skb- using first online " 1520 "CPU.\n"); 1521 1522 spin_unlock(&fps->fcoe_rx_list.lock); 1523 cpu = cpumask_first(cpu_online_mask); 1524 fps = &per_cpu(fcoe_percpu, cpu); 1525 spin_lock(&fps->fcoe_rx_list.lock); 1526 if (!fps->thread) { 1527 spin_unlock(&fps->fcoe_rx_list.lock); 1528 goto err; 1529 } 1530 } 1531 1532 /* 1533 * We now have a valid CPU that we're targeting for 1534 * this skb. We also have this receive thread locked, 1535 * so we're free to queue skbs into it's queue. 1536 */ 1537 1538 /* 1539 * Note: We used to have a set of conditions under which we would 1540 * call fcoe_recv_frame directly, rather than queuing to the rx list 1541 * as it could save a few cycles, but doing so is prohibited, as 1542 * fcoe_recv_frame has several paths that may sleep, which is forbidden 1543 * in softirq context. 1544 */ 1545 __skb_queue_tail(&fps->fcoe_rx_list, skb); 1546 if (fps->thread->state == TASK_INTERRUPTIBLE) 1547 wake_up_process(fps->thread); 1548 spin_unlock(&fps->fcoe_rx_list.lock); 1549 1550 return NET_RX_SUCCESS; 1551 err: 1552 per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++; 1553 put_cpu(); 1554 err2: 1555 kfree_skb(skb); 1556 return NET_RX_DROP; 1557 } 1558 1559 /** 1560 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC 1561 * @skb: The packet to be transmitted 1562 * @tlen: The total length of the trailer 1563 * 1564 * Returns: 0 for success 1565 */ 1566 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) 1567 { 1568 struct fcoe_percpu_s *fps; 1569 int rc; 1570 1571 fps = &get_cpu_var(fcoe_percpu); 1572 rc = fcoe_get_paged_crc_eof(skb, tlen, fps); 1573 put_cpu_var(fcoe_percpu); 1574 1575 return rc; 1576 } 1577 1578 /** 1579 * fcoe_xmit() - Transmit a FCoE frame 1580 * @lport: The local port that the frame is to be transmitted for 1581 * @fp: The frame to be transmitted 1582 * 1583 * Return: 0 for success 1584 */ 1585 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp) 1586 { 1587 int wlen; 1588 u32 crc; 1589 struct ethhdr *eh; 1590 struct fcoe_crc_eof *cp; 1591 struct sk_buff *skb; 1592 struct fc_stats *stats; 1593 struct fc_frame_header *fh; 1594 unsigned int hlen; /* header length implies the version */ 1595 unsigned int tlen; /* trailer length */ 1596 unsigned int elen; /* eth header, may include vlan */ 1597 struct fcoe_port *port = lport_priv(lport); 1598 struct fcoe_interface *fcoe = port->priv; 1599 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1600 u8 sof, eof; 1601 struct fcoe_hdr *hp; 1602 1603 WARN_ON((fr_len(fp) % sizeof(u32)) != 0); 1604 1605 fh = fc_frame_header_get(fp); 1606 skb = fp_skb(fp); 1607 wlen = skb->len / FCOE_WORD_TO_BYTE; 1608 1609 if (!lport->link_up) { 1610 kfree_skb(skb); 1611 return 0; 1612 } 1613 1614 if (unlikely(fh->fh_type == FC_TYPE_ELS) && 1615 fcoe_ctlr_els_send(ctlr, lport, skb)) 1616 return 0; 1617 1618 sof = fr_sof(fp); 1619 eof = fr_eof(fp); 1620 1621 elen = sizeof(struct ethhdr); 1622 hlen = sizeof(struct fcoe_hdr); 1623 tlen = sizeof(struct fcoe_crc_eof); 1624 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; 1625 1626 /* crc offload */ 1627 if (likely(lport->crc_offload)) { 1628 skb->ip_summed = CHECKSUM_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 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 1673 vlan_dev_vlan_id(fcoe->netdev)); 1674 } else 1675 skb->dev = fcoe->netdev; 1676 1677 /* fill up mac and fcoe headers */ 1678 eh = eth_hdr(skb); 1679 eh->h_proto = htons(ETH_P_FCOE); 1680 memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN); 1681 if (ctlr->map_dest) 1682 memcpy(eh->h_dest + 3, fh->fh_d_id, 3); 1683 1684 if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN)) 1685 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN); 1686 else 1687 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); 1688 1689 hp = (struct fcoe_hdr *)(eh + 1); 1690 memset(hp, 0, sizeof(*hp)); 1691 if (FC_FCOE_VER) 1692 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); 1693 hp->fcoe_sof = sof; 1694 1695 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ 1696 if (lport->seq_offload && fr_max_payload(fp)) { 1697 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; 1698 skb_shinfo(skb)->gso_size = fr_max_payload(fp); 1699 } else { 1700 skb_shinfo(skb)->gso_type = 0; 1701 skb_shinfo(skb)->gso_size = 0; 1702 } 1703 /* update tx stats: regardless if LLD fails */ 1704 stats = per_cpu_ptr(lport->stats, get_cpu()); 1705 stats->TxFrames++; 1706 stats->TxWords += wlen; 1707 put_cpu(); 1708 1709 /* send down to lld */ 1710 fr_dev(fp) = lport; 1711 fcoe_port_send(port, skb); 1712 return 0; 1713 } 1714 1715 /** 1716 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion 1717 * @skb: The completed skb (argument required by destructor) 1718 */ 1719 static void fcoe_percpu_flush_done(struct sk_buff *skb) 1720 { 1721 complete(&fcoe_flush_completion); 1722 } 1723 1724 /** 1725 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC 1726 * @lport: The local port the frame was received on 1727 * @fp: The received frame 1728 * 1729 * Return: 0 on passing filtering checks 1730 */ 1731 static inline int fcoe_filter_frames(struct fc_lport *lport, 1732 struct fc_frame *fp) 1733 { 1734 struct fcoe_ctlr *ctlr; 1735 struct fcoe_interface *fcoe; 1736 struct fc_frame_header *fh; 1737 struct sk_buff *skb = (struct sk_buff *)fp; 1738 struct fc_stats *stats; 1739 1740 /* 1741 * We only check CRC if no offload is available and if it is 1742 * it's solicited data, in which case, the FCP layer would 1743 * check it during the copy. 1744 */ 1745 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) 1746 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1747 else 1748 fr_flags(fp) |= FCPHF_CRC_UNCHECKED; 1749 1750 fh = (struct fc_frame_header *) skb_transport_header(skb); 1751 fh = fc_frame_header_get(fp); 1752 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP) 1753 return 0; 1754 1755 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv; 1756 ctlr = fcoe_to_ctlr(fcoe); 1757 if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO && 1758 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) { 1759 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n"); 1760 return -EINVAL; 1761 } 1762 1763 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) || 1764 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) { 1765 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1766 return 0; 1767 } 1768 1769 stats = per_cpu_ptr(lport->stats, get_cpu()); 1770 stats->InvalidCRCCount++; 1771 if (stats->InvalidCRCCount < 5) 1772 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); 1773 put_cpu(); 1774 return -EINVAL; 1775 } 1776 1777 /** 1778 * fcoe_recv_frame() - process a single received frame 1779 * @skb: frame to process 1780 */ 1781 static void fcoe_recv_frame(struct sk_buff *skb) 1782 { 1783 u32 fr_len; 1784 struct fc_lport *lport; 1785 struct fcoe_rcv_info *fr; 1786 struct fc_stats *stats; 1787 struct fcoe_crc_eof crc_eof; 1788 struct fc_frame *fp; 1789 struct fcoe_port *port; 1790 struct fcoe_hdr *hp; 1791 1792 fr = fcoe_dev_from_skb(skb); 1793 lport = fr->fr_dev; 1794 if (unlikely(!lport)) { 1795 if (skb->destructor != fcoe_percpu_flush_done) 1796 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n"); 1797 kfree_skb(skb); 1798 return; 1799 } 1800 1801 FCOE_NETDEV_DBG(skb->dev, 1802 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n", 1803 skb->len, skb->data_len, 1804 skb->head, skb->data, skb_tail_pointer(skb), 1805 skb_end_pointer(skb), skb->csum, 1806 skb->dev ? skb->dev->name : "<NULL>"); 1807 1808 port = lport_priv(lport); 1809 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */ 1810 1811 /* 1812 * Frame length checks and setting up the header pointers 1813 * was done in fcoe_rcv already. 1814 */ 1815 hp = (struct fcoe_hdr *) skb_network_header(skb); 1816 1817 stats = per_cpu_ptr(lport->stats, get_cpu()); 1818 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { 1819 if (stats->ErrorFrames < 5) 1820 printk(KERN_WARNING "fcoe: FCoE version " 1821 "mismatch: The frame has " 1822 "version %x, but the " 1823 "initiator supports version " 1824 "%x\n", FC_FCOE_DECAPS_VER(hp), 1825 FC_FCOE_VER); 1826 goto drop; 1827 } 1828 1829 skb_pull(skb, sizeof(struct fcoe_hdr)); 1830 fr_len = skb->len - sizeof(struct fcoe_crc_eof); 1831 1832 stats->RxFrames++; 1833 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; 1834 1835 fp = (struct fc_frame *)skb; 1836 fc_frame_init(fp); 1837 fr_dev(fp) = lport; 1838 fr_sof(fp) = hp->fcoe_sof; 1839 1840 /* Copy out the CRC and EOF trailer for access */ 1841 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) 1842 goto drop; 1843 fr_eof(fp) = crc_eof.fcoe_eof; 1844 fr_crc(fp) = crc_eof.fcoe_crc32; 1845 if (pskb_trim(skb, fr_len)) 1846 goto drop; 1847 1848 if (!fcoe_filter_frames(lport, fp)) { 1849 put_cpu(); 1850 fc_exch_recv(lport, fp); 1851 return; 1852 } 1853 drop: 1854 stats->ErrorFrames++; 1855 put_cpu(); 1856 kfree_skb(skb); 1857 } 1858 1859 /** 1860 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread 1861 * @arg: The per-CPU context 1862 * 1863 * Return: 0 for success 1864 */ 1865 static int fcoe_percpu_receive_thread(void *arg) 1866 { 1867 struct fcoe_percpu_s *p = arg; 1868 struct sk_buff *skb; 1869 struct sk_buff_head tmp; 1870 1871 skb_queue_head_init(&tmp); 1872 1873 set_user_nice(current, MIN_NICE); 1874 1875 while (!kthread_should_stop()) { 1876 1877 spin_lock_bh(&p->fcoe_rx_list.lock); 1878 skb_queue_splice_init(&p->fcoe_rx_list, &tmp); 1879 1880 if (!skb_queue_len(&tmp)) { 1881 set_current_state(TASK_INTERRUPTIBLE); 1882 spin_unlock_bh(&p->fcoe_rx_list.lock); 1883 schedule(); 1884 continue; 1885 } 1886 1887 spin_unlock_bh(&p->fcoe_rx_list.lock); 1888 1889 while ((skb = __skb_dequeue(&tmp)) != NULL) 1890 fcoe_recv_frame(skb); 1891 1892 } 1893 return 0; 1894 } 1895 1896 /** 1897 * fcoe_dev_setup() - Setup the link change notification interface 1898 */ 1899 static void fcoe_dev_setup(void) 1900 { 1901 register_dcbevent_notifier(&dcb_notifier); 1902 register_netdevice_notifier(&fcoe_notifier); 1903 } 1904 1905 /** 1906 * fcoe_dev_cleanup() - Cleanup the link change notification interface 1907 */ 1908 static void fcoe_dev_cleanup(void) 1909 { 1910 unregister_dcbevent_notifier(&dcb_notifier); 1911 unregister_netdevice_notifier(&fcoe_notifier); 1912 } 1913 1914 static struct fcoe_interface * 1915 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev) 1916 { 1917 struct fcoe_interface *fcoe; 1918 struct net_device *real_dev; 1919 1920 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1921 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 1922 real_dev = vlan_dev_real_dev(fcoe->netdev); 1923 else 1924 real_dev = fcoe->netdev; 1925 1926 if (netdev == real_dev) 1927 return fcoe; 1928 } 1929 return NULL; 1930 } 1931 1932 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 1933 ulong event, void *ptr) 1934 { 1935 struct dcb_app_type *entry = ptr; 1936 struct fcoe_ctlr *ctlr; 1937 struct fcoe_interface *fcoe; 1938 struct net_device *netdev; 1939 int prio; 1940 1941 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE) 1942 return NOTIFY_OK; 1943 1944 netdev = dev_get_by_index(&init_net, entry->ifindex); 1945 if (!netdev) 1946 return NOTIFY_OK; 1947 1948 fcoe = fcoe_hostlist_lookup_realdev_port(netdev); 1949 dev_put(netdev); 1950 if (!fcoe) 1951 return NOTIFY_OK; 1952 1953 ctlr = fcoe_to_ctlr(fcoe); 1954 1955 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE) 1956 prio = ffs(entry->app.priority) - 1; 1957 else 1958 prio = entry->app.priority; 1959 1960 if (prio < 0) 1961 return NOTIFY_OK; 1962 1963 if (entry->app.protocol == ETH_P_FIP || 1964 entry->app.protocol == ETH_P_FCOE) 1965 ctlr->priority = prio; 1966 1967 if (entry->app.protocol == ETH_P_FCOE) 1968 fcoe->priority = prio; 1969 1970 return NOTIFY_OK; 1971 } 1972 1973 /** 1974 * fcoe_device_notification() - Handler for net device events 1975 * @notifier: The context of the notification 1976 * @event: The type of event 1977 * @ptr: The net device that the event was on 1978 * 1979 * This function is called by the Ethernet driver in case of link change event. 1980 * 1981 * Returns: 0 for success 1982 */ 1983 static int fcoe_device_notification(struct notifier_block *notifier, 1984 ulong event, void *ptr) 1985 { 1986 struct fcoe_ctlr_device *cdev; 1987 struct fc_lport *lport = NULL; 1988 struct net_device *netdev = netdev_notifier_info_to_dev(ptr); 1989 struct fcoe_ctlr *ctlr; 1990 struct fcoe_interface *fcoe; 1991 struct fcoe_port *port; 1992 struct fc_stats *stats; 1993 u32 link_possible = 1; 1994 u32 mfs; 1995 int rc = NOTIFY_OK; 1996 1997 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1998 if (fcoe->netdev == netdev) { 1999 ctlr = fcoe_to_ctlr(fcoe); 2000 lport = ctlr->lp; 2001 break; 2002 } 2003 } 2004 if (!lport) { 2005 rc = NOTIFY_DONE; 2006 goto out; 2007 } 2008 2009 switch (event) { 2010 case NETDEV_DOWN: 2011 case NETDEV_GOING_DOWN: 2012 link_possible = 0; 2013 break; 2014 case NETDEV_UP: 2015 case NETDEV_CHANGE: 2016 break; 2017 case NETDEV_CHANGEMTU: 2018 if (netdev->features & NETIF_F_FCOE_MTU) 2019 break; 2020 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + 2021 sizeof(struct fcoe_crc_eof)); 2022 if (mfs >= FC_MIN_MAX_FRAME) 2023 fc_set_mfs(lport, mfs); 2024 break; 2025 case NETDEV_REGISTER: 2026 break; 2027 case NETDEV_UNREGISTER: 2028 list_del(&fcoe->list); 2029 port = lport_priv(ctlr->lp); 2030 queue_work(fcoe_wq, &port->destroy_work); 2031 goto out; 2032 break; 2033 case NETDEV_FEAT_CHANGE: 2034 fcoe_netdev_features_change(lport, netdev); 2035 break; 2036 default: 2037 FCOE_NETDEV_DBG(netdev, "Unknown event %ld " 2038 "from netdev netlink\n", event); 2039 } 2040 2041 fcoe_link_speed_update(lport); 2042 2043 cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2044 2045 if (link_possible && !fcoe_link_ok(lport)) { 2046 switch (cdev->enabled) { 2047 case FCOE_CTLR_DISABLED: 2048 pr_info("Link up while interface is disabled.\n"); 2049 break; 2050 case FCOE_CTLR_ENABLED: 2051 case FCOE_CTLR_UNUSED: 2052 fcoe_ctlr_link_up(ctlr); 2053 }; 2054 } else if (fcoe_ctlr_link_down(ctlr)) { 2055 switch (cdev->enabled) { 2056 case FCOE_CTLR_DISABLED: 2057 pr_info("Link down while interface is disabled.\n"); 2058 break; 2059 case FCOE_CTLR_ENABLED: 2060 case FCOE_CTLR_UNUSED: 2061 stats = per_cpu_ptr(lport->stats, get_cpu()); 2062 stats->LinkFailureCount++; 2063 put_cpu(); 2064 fcoe_clean_pending_queue(lport); 2065 }; 2066 } 2067 out: 2068 return rc; 2069 } 2070 2071 /** 2072 * fcoe_disable() - Disables a FCoE interface 2073 * @netdev : The net_device object the Ethernet interface to create on 2074 * 2075 * Called from fcoe transport. 2076 * 2077 * Returns: 0 for success 2078 * 2079 * Deprecated: use fcoe_ctlr_enabled() 2080 */ 2081 static int fcoe_disable(struct net_device *netdev) 2082 { 2083 struct fcoe_ctlr *ctlr; 2084 struct fcoe_interface *fcoe; 2085 int rc = 0; 2086 2087 mutex_lock(&fcoe_config_mutex); 2088 2089 rtnl_lock(); 2090 fcoe = fcoe_hostlist_lookup_port(netdev); 2091 rtnl_unlock(); 2092 2093 if (fcoe) { 2094 ctlr = fcoe_to_ctlr(fcoe); 2095 fcoe_ctlr_link_down(ctlr); 2096 fcoe_clean_pending_queue(ctlr->lp); 2097 } else 2098 rc = -ENODEV; 2099 2100 mutex_unlock(&fcoe_config_mutex); 2101 return rc; 2102 } 2103 2104 /** 2105 * fcoe_enable() - Enables a FCoE interface 2106 * @netdev : The net_device object the Ethernet interface to create on 2107 * 2108 * Called from fcoe transport. 2109 * 2110 * Returns: 0 for success 2111 */ 2112 static int fcoe_enable(struct net_device *netdev) 2113 { 2114 struct fcoe_ctlr *ctlr; 2115 struct fcoe_interface *fcoe; 2116 int rc = 0; 2117 2118 mutex_lock(&fcoe_config_mutex); 2119 rtnl_lock(); 2120 fcoe = fcoe_hostlist_lookup_port(netdev); 2121 rtnl_unlock(); 2122 2123 if (!fcoe) { 2124 rc = -ENODEV; 2125 goto out; 2126 } 2127 2128 ctlr = fcoe_to_ctlr(fcoe); 2129 2130 if (!fcoe_link_ok(ctlr->lp)) 2131 fcoe_ctlr_link_up(ctlr); 2132 2133 out: 2134 mutex_unlock(&fcoe_config_mutex); 2135 return rc; 2136 } 2137 2138 /** 2139 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller 2140 * @cdev: The FCoE Controller that is being enabled or disabled 2141 * 2142 * fcoe_sysfs will ensure that the state of 'enabled' has 2143 * changed, so no checking is necessary here. This routine simply 2144 * calls fcoe_enable or fcoe_disable, both of which are deprecated. 2145 * When those routines are removed the functionality can be merged 2146 * here. 2147 */ 2148 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev) 2149 { 2150 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev); 2151 struct fc_lport *lport = ctlr->lp; 2152 struct net_device *netdev = fcoe_netdev(lport); 2153 2154 switch (cdev->enabled) { 2155 case FCOE_CTLR_ENABLED: 2156 return fcoe_enable(netdev); 2157 case FCOE_CTLR_DISABLED: 2158 return fcoe_disable(netdev); 2159 case FCOE_CTLR_UNUSED: 2160 default: 2161 return -ENOTSUPP; 2162 }; 2163 } 2164 2165 /** 2166 * fcoe_destroy() - Destroy a FCoE interface 2167 * @netdev : The net_device object the Ethernet interface to create on 2168 * 2169 * Called from fcoe transport 2170 * 2171 * Returns: 0 for success 2172 */ 2173 static int fcoe_destroy(struct net_device *netdev) 2174 { 2175 struct fcoe_ctlr *ctlr; 2176 struct fcoe_interface *fcoe; 2177 struct fc_lport *lport; 2178 struct fcoe_port *port; 2179 int rc = 0; 2180 2181 mutex_lock(&fcoe_config_mutex); 2182 rtnl_lock(); 2183 fcoe = fcoe_hostlist_lookup_port(netdev); 2184 if (!fcoe) { 2185 rc = -ENODEV; 2186 goto out_nodev; 2187 } 2188 ctlr = fcoe_to_ctlr(fcoe); 2189 lport = ctlr->lp; 2190 port = lport_priv(lport); 2191 list_del(&fcoe->list); 2192 queue_work(fcoe_wq, &port->destroy_work); 2193 out_nodev: 2194 rtnl_unlock(); 2195 mutex_unlock(&fcoe_config_mutex); 2196 return rc; 2197 } 2198 2199 /** 2200 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context 2201 * @work: Handle to the FCoE port to be destroyed 2202 */ 2203 static void fcoe_destroy_work(struct work_struct *work) 2204 { 2205 struct fcoe_ctlr_device *cdev; 2206 struct fcoe_ctlr *ctlr; 2207 struct fcoe_port *port; 2208 struct fcoe_interface *fcoe; 2209 struct Scsi_Host *shost; 2210 struct fc_host_attrs *fc_host; 2211 unsigned long flags; 2212 struct fc_vport *vport; 2213 struct fc_vport *next_vport; 2214 2215 port = container_of(work, struct fcoe_port, destroy_work); 2216 shost = port->lport->host; 2217 fc_host = shost_to_fc_host(shost); 2218 2219 /* Loop through all the vports and mark them for deletion */ 2220 spin_lock_irqsave(shost->host_lock, flags); 2221 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) { 2222 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) { 2223 continue; 2224 } else { 2225 vport->flags |= FC_VPORT_DELETING; 2226 queue_work(fc_host_work_q(shost), 2227 &vport->vport_delete_work); 2228 } 2229 } 2230 spin_unlock_irqrestore(shost->host_lock, flags); 2231 2232 flush_workqueue(fc_host_work_q(shost)); 2233 2234 mutex_lock(&fcoe_config_mutex); 2235 2236 fcoe = port->priv; 2237 ctlr = fcoe_to_ctlr(fcoe); 2238 cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2239 2240 fcoe_if_destroy(port->lport); 2241 fcoe_interface_cleanup(fcoe); 2242 2243 mutex_unlock(&fcoe_config_mutex); 2244 2245 fcoe_ctlr_device_delete(cdev); 2246 } 2247 2248 /** 2249 * fcoe_match() - Check if the FCoE is supported on the given netdevice 2250 * @netdev : The net_device object the Ethernet interface to create on 2251 * 2252 * Called from fcoe transport. 2253 * 2254 * Returns: always returns true as this is the default FCoE transport, 2255 * i.e., support all netdevs. 2256 */ 2257 static bool fcoe_match(struct net_device *netdev) 2258 { 2259 return true; 2260 } 2261 2262 /** 2263 * fcoe_dcb_create() - Initialize DCB attributes and hooks 2264 * @netdev: The net_device object of the L2 link that should be queried 2265 * @port: The fcoe_port to bind FCoE APP priority with 2266 * @ 2267 */ 2268 static void fcoe_dcb_create(struct fcoe_interface *fcoe) 2269 { 2270 #ifdef CONFIG_DCB 2271 int dcbx; 2272 u8 fup, up; 2273 struct net_device *netdev = fcoe->realdev; 2274 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2275 struct dcb_app app = { 2276 .priority = 0, 2277 .protocol = ETH_P_FCOE 2278 }; 2279 2280 /* setup DCB priority attributes. */ 2281 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) { 2282 dcbx = netdev->dcbnl_ops->getdcbx(netdev); 2283 2284 if (dcbx & DCB_CAP_DCBX_VER_IEEE) { 2285 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE; 2286 up = dcb_ieee_getapp_mask(netdev, &app); 2287 app.protocol = ETH_P_FIP; 2288 fup = dcb_ieee_getapp_mask(netdev, &app); 2289 } else { 2290 app.selector = DCB_APP_IDTYPE_ETHTYPE; 2291 up = dcb_getapp(netdev, &app); 2292 app.protocol = ETH_P_FIP; 2293 fup = dcb_getapp(netdev, &app); 2294 } 2295 2296 fcoe->priority = ffs(up) ? ffs(up) - 1 : 0; 2297 ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority; 2298 } 2299 #endif 2300 } 2301 2302 enum fcoe_create_link_state { 2303 FCOE_CREATE_LINK_DOWN, 2304 FCOE_CREATE_LINK_UP, 2305 }; 2306 2307 /** 2308 * _fcoe_create() - (internal) Create a fcoe interface 2309 * @netdev : The net_device object the Ethernet interface to create on 2310 * @fip_mode: The FIP mode for this creation 2311 * @link_state: The ctlr link state on creation 2312 * 2313 * Called from either the libfcoe 'create' module parameter 2314 * via fcoe_create or from fcoe_syfs's ctlr_create file. 2315 * 2316 * libfcoe's 'create' module parameter is deprecated so some 2317 * consolidation of code can be done when that interface is 2318 * removed. 2319 */ 2320 static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode, 2321 enum fcoe_create_link_state link_state) 2322 { 2323 int rc = 0; 2324 struct fcoe_ctlr_device *ctlr_dev; 2325 struct fcoe_ctlr *ctlr; 2326 struct fcoe_interface *fcoe; 2327 struct fc_lport *lport; 2328 2329 mutex_lock(&fcoe_config_mutex); 2330 rtnl_lock(); 2331 2332 /* look for existing lport */ 2333 if (fcoe_hostlist_lookup(netdev)) { 2334 rc = -EEXIST; 2335 goto out_nodev; 2336 } 2337 2338 fcoe = fcoe_interface_create(netdev, fip_mode); 2339 if (IS_ERR(fcoe)) { 2340 rc = PTR_ERR(fcoe); 2341 goto out_nodev; 2342 } 2343 2344 ctlr = fcoe_to_ctlr(fcoe); 2345 ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr); 2346 lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0); 2347 if (IS_ERR(lport)) { 2348 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", 2349 netdev->name); 2350 rc = -EIO; 2351 rtnl_unlock(); 2352 fcoe_interface_cleanup(fcoe); 2353 mutex_unlock(&fcoe_config_mutex); 2354 fcoe_ctlr_device_delete(ctlr_dev); 2355 goto out; 2356 } 2357 2358 /* Make this the "master" N_Port */ 2359 ctlr->lp = lport; 2360 2361 /* setup DCB priority attributes. */ 2362 fcoe_dcb_create(fcoe); 2363 2364 /* start FIP Discovery and FLOGI */ 2365 lport->boot_time = jiffies; 2366 fc_fabric_login(lport); 2367 2368 /* 2369 * If the fcoe_ctlr_device is to be set to DISABLED 2370 * it must be done after the lport is added to the 2371 * hostlist, but before the rtnl_lock is released. 2372 * This is because the rtnl_lock protects the 2373 * hostlist that fcoe_device_notification uses. If 2374 * the FCoE Controller is intended to be created 2375 * DISABLED then 'enabled' needs to be considered 2376 * handling link events. 'enabled' must be set 2377 * before the lport can be found in the hostlist 2378 * when a link up event is received. 2379 */ 2380 if (link_state == FCOE_CREATE_LINK_UP) 2381 ctlr_dev->enabled = FCOE_CTLR_ENABLED; 2382 else 2383 ctlr_dev->enabled = FCOE_CTLR_DISABLED; 2384 2385 if (link_state == FCOE_CREATE_LINK_UP && 2386 !fcoe_link_ok(lport)) { 2387 rtnl_unlock(); 2388 fcoe_ctlr_link_up(ctlr); 2389 mutex_unlock(&fcoe_config_mutex); 2390 return rc; 2391 } 2392 2393 out_nodev: 2394 rtnl_unlock(); 2395 mutex_unlock(&fcoe_config_mutex); 2396 out: 2397 return rc; 2398 } 2399 2400 /** 2401 * fcoe_create() - Create a fcoe interface 2402 * @netdev : The net_device object the Ethernet interface to create on 2403 * @fip_mode: The FIP mode for this creation 2404 * 2405 * Called from fcoe transport 2406 * 2407 * Returns: 0 for success 2408 */ 2409 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode) 2410 { 2411 return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP); 2412 } 2413 2414 /** 2415 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs 2416 * @netdev: The net_device to be used by the allocated FCoE Controller 2417 * 2418 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr 2419 * in a link_down state. The allows the user an opportunity to configure 2420 * the FCoE Controller from sysfs before enabling the FCoE Controller. 2421 * 2422 * Creating in with this routine starts the FCoE Controller in Fabric 2423 * mode. The user can change to VN2VN or another mode before enabling. 2424 */ 2425 static int fcoe_ctlr_alloc(struct net_device *netdev) 2426 { 2427 return _fcoe_create(netdev, FIP_MODE_FABRIC, 2428 FCOE_CREATE_LINK_DOWN); 2429 } 2430 2431 /** 2432 * fcoe_link_ok() - Check if the link is OK for a local port 2433 * @lport: The local port to check link on 2434 * 2435 * Returns: 0 if link is UP and OK, -1 if not 2436 * 2437 */ 2438 static int fcoe_link_ok(struct fc_lport *lport) 2439 { 2440 struct net_device *netdev = fcoe_netdev(lport); 2441 2442 if (netif_oper_up(netdev)) 2443 return 0; 2444 return -1; 2445 } 2446 2447 /** 2448 * fcoe_percpu_clean() - Clear all pending skbs for an local port 2449 * @lport: The local port whose skbs are to be cleared 2450 * 2451 * Must be called with fcoe_create_mutex held to single-thread completion. 2452 * 2453 * This flushes the pending skbs by adding a new skb to each queue and 2454 * waiting until they are all freed. This assures us that not only are 2455 * there no packets that will be handled by the lport, but also that any 2456 * threads already handling packet have returned. 2457 */ 2458 static void fcoe_percpu_clean(struct fc_lport *lport) 2459 { 2460 struct fcoe_percpu_s *pp; 2461 struct sk_buff *skb; 2462 unsigned int cpu; 2463 2464 for_each_possible_cpu(cpu) { 2465 pp = &per_cpu(fcoe_percpu, cpu); 2466 2467 if (!pp->thread || !cpu_online(cpu)) 2468 continue; 2469 2470 skb = dev_alloc_skb(0); 2471 if (!skb) 2472 continue; 2473 2474 skb->destructor = fcoe_percpu_flush_done; 2475 2476 spin_lock_bh(&pp->fcoe_rx_list.lock); 2477 __skb_queue_tail(&pp->fcoe_rx_list, skb); 2478 if (pp->fcoe_rx_list.qlen == 1) 2479 wake_up_process(pp->thread); 2480 spin_unlock_bh(&pp->fcoe_rx_list.lock); 2481 2482 wait_for_completion(&fcoe_flush_completion); 2483 } 2484 } 2485 2486 /** 2487 * fcoe_reset() - Reset a local port 2488 * @shost: The SCSI host associated with the local port to be reset 2489 * 2490 * Returns: Always 0 (return value required by FC transport template) 2491 */ 2492 static int fcoe_reset(struct Scsi_Host *shost) 2493 { 2494 struct fc_lport *lport = shost_priv(shost); 2495 struct fcoe_port *port = lport_priv(lport); 2496 struct fcoe_interface *fcoe = port->priv; 2497 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2498 struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr); 2499 2500 fcoe_ctlr_link_down(ctlr); 2501 fcoe_clean_pending_queue(ctlr->lp); 2502 2503 if (cdev->enabled != FCOE_CTLR_DISABLED && 2504 !fcoe_link_ok(ctlr->lp)) 2505 fcoe_ctlr_link_up(ctlr); 2506 return 0; 2507 } 2508 2509 /** 2510 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device 2511 * @netdev: The net device used as a key 2512 * 2513 * Locking: Must be called with the RNL mutex held. 2514 * 2515 * Returns: NULL or the FCoE interface 2516 */ 2517 static struct fcoe_interface * 2518 fcoe_hostlist_lookup_port(const struct net_device *netdev) 2519 { 2520 struct fcoe_interface *fcoe; 2521 2522 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 2523 if (fcoe->netdev == netdev) 2524 return fcoe; 2525 } 2526 return NULL; 2527 } 2528 2529 /** 2530 * fcoe_hostlist_lookup() - Find the local port associated with a 2531 * given net device 2532 * @netdev: The netdevice used as a key 2533 * 2534 * Locking: Must be called with the RTNL mutex held 2535 * 2536 * Returns: NULL or the local port 2537 */ 2538 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) 2539 { 2540 struct fcoe_ctlr *ctlr; 2541 struct fcoe_interface *fcoe; 2542 2543 fcoe = fcoe_hostlist_lookup_port(netdev); 2544 ctlr = fcoe_to_ctlr(fcoe); 2545 return (fcoe) ? ctlr->lp : NULL; 2546 } 2547 2548 /** 2549 * fcoe_hostlist_add() - Add the FCoE interface identified by a local 2550 * port to the hostlist 2551 * @lport: The local port that identifies the FCoE interface to be added 2552 * 2553 * Locking: must be called with the RTNL mutex held 2554 * 2555 * Returns: 0 for success 2556 */ 2557 static int fcoe_hostlist_add(const struct fc_lport *lport) 2558 { 2559 struct fcoe_interface *fcoe; 2560 struct fcoe_port *port; 2561 2562 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); 2563 if (!fcoe) { 2564 port = lport_priv(lport); 2565 fcoe = port->priv; 2566 list_add_tail(&fcoe->list, &fcoe_hostlist); 2567 } 2568 return 0; 2569 } 2570 2571 /** 2572 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local 2573 * port to the hostlist 2574 * @lport: The local port that identifies the FCoE interface to be added 2575 * 2576 * Locking: must be called with the RTNL mutex held 2577 * 2578 */ 2579 static void fcoe_hostlist_del(const struct fc_lport *lport) 2580 { 2581 struct fcoe_interface *fcoe; 2582 struct fcoe_port *port; 2583 2584 port = lport_priv(lport); 2585 fcoe = port->priv; 2586 list_del(&fcoe->list); 2587 return; 2588 } 2589 2590 static struct fcoe_transport fcoe_sw_transport = { 2591 .name = {FCOE_TRANSPORT_DEFAULT}, 2592 .attached = false, 2593 .list = LIST_HEAD_INIT(fcoe_sw_transport.list), 2594 .match = fcoe_match, 2595 .alloc = fcoe_ctlr_alloc, 2596 .create = fcoe_create, 2597 .destroy = fcoe_destroy, 2598 .enable = fcoe_enable, 2599 .disable = fcoe_disable, 2600 }; 2601 2602 /** 2603 * fcoe_init() - Initialize fcoe.ko 2604 * 2605 * Returns: 0 on success, or a negative value on failure 2606 */ 2607 static int __init fcoe_init(void) 2608 { 2609 struct fcoe_percpu_s *p; 2610 unsigned int cpu; 2611 int rc = 0; 2612 2613 fcoe_wq = alloc_workqueue("fcoe", 0, 0); 2614 if (!fcoe_wq) 2615 return -ENOMEM; 2616 2617 /* register as a fcoe transport */ 2618 rc = fcoe_transport_attach(&fcoe_sw_transport); 2619 if (rc) { 2620 printk(KERN_ERR "failed to register an fcoe transport, check " 2621 "if libfcoe is loaded\n"); 2622 return rc; 2623 } 2624 2625 mutex_lock(&fcoe_config_mutex); 2626 2627 for_each_possible_cpu(cpu) { 2628 p = &per_cpu(fcoe_percpu, cpu); 2629 skb_queue_head_init(&p->fcoe_rx_list); 2630 } 2631 2632 cpu_notifier_register_begin(); 2633 2634 for_each_online_cpu(cpu) 2635 fcoe_percpu_thread_create(cpu); 2636 2637 /* Initialize per CPU interrupt thread */ 2638 rc = __register_hotcpu_notifier(&fcoe_cpu_notifier); 2639 if (rc) 2640 goto out_free; 2641 2642 cpu_notifier_register_done(); 2643 2644 /* Setup link change notification */ 2645 fcoe_dev_setup(); 2646 2647 rc = fcoe_if_init(); 2648 if (rc) 2649 goto out_free; 2650 2651 mutex_unlock(&fcoe_config_mutex); 2652 return 0; 2653 2654 out_free: 2655 for_each_online_cpu(cpu) { 2656 fcoe_percpu_thread_destroy(cpu); 2657 } 2658 2659 cpu_notifier_register_done(); 2660 2661 mutex_unlock(&fcoe_config_mutex); 2662 destroy_workqueue(fcoe_wq); 2663 return rc; 2664 } 2665 module_init(fcoe_init); 2666 2667 /** 2668 * fcoe_exit() - Clean up fcoe.ko 2669 * 2670 * Returns: 0 on success or a negative value on failure 2671 */ 2672 static void __exit fcoe_exit(void) 2673 { 2674 struct fcoe_interface *fcoe, *tmp; 2675 struct fcoe_ctlr *ctlr; 2676 struct fcoe_port *port; 2677 unsigned int cpu; 2678 2679 mutex_lock(&fcoe_config_mutex); 2680 2681 fcoe_dev_cleanup(); 2682 2683 /* releases the associated fcoe hosts */ 2684 rtnl_lock(); 2685 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) { 2686 ctlr = fcoe_to_ctlr(fcoe); 2687 port = lport_priv(ctlr->lp); 2688 fcoe_hostlist_del(port->lport); 2689 queue_work(fcoe_wq, &port->destroy_work); 2690 } 2691 rtnl_unlock(); 2692 2693 cpu_notifier_register_begin(); 2694 2695 for_each_online_cpu(cpu) 2696 fcoe_percpu_thread_destroy(cpu); 2697 2698 __unregister_hotcpu_notifier(&fcoe_cpu_notifier); 2699 2700 cpu_notifier_register_done(); 2701 2702 mutex_unlock(&fcoe_config_mutex); 2703 2704 /* 2705 * destroy_work's may be chained but destroy_workqueue() 2706 * can take care of them. Just kill the fcoe_wq. 2707 */ 2708 destroy_workqueue(fcoe_wq); 2709 2710 /* 2711 * Detaching from the scsi transport must happen after all 2712 * destroys are done on the fcoe_wq. destroy_workqueue will 2713 * enusre the fcoe_wq is flushed. 2714 */ 2715 fcoe_if_exit(); 2716 2717 /* detach from fcoe transport */ 2718 fcoe_transport_detach(&fcoe_sw_transport); 2719 } 2720 module_exit(fcoe_exit); 2721 2722 /** 2723 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler 2724 * @seq: active sequence in the FLOGI or FDISC exchange 2725 * @fp: response frame, or error encoded in a pointer (timeout) 2726 * @arg: pointer the the fcoe_ctlr structure 2727 * 2728 * This handles MAC address management for FCoE, then passes control on to 2729 * the libfc FLOGI response handler. 2730 */ 2731 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2732 { 2733 struct fcoe_ctlr *fip = arg; 2734 struct fc_exch *exch = fc_seq_exch(seq); 2735 struct fc_lport *lport = exch->lp; 2736 u8 *mac; 2737 2738 if (IS_ERR(fp)) 2739 goto done; 2740 2741 mac = fr_cb(fp)->granted_mac; 2742 /* pre-FIP */ 2743 if (is_zero_ether_addr(mac)) 2744 fcoe_ctlr_recv_flogi(fip, lport, fp); 2745 if (!is_zero_ether_addr(mac)) 2746 fcoe_update_src_mac(lport, mac); 2747 done: 2748 fc_lport_flogi_resp(seq, fp, lport); 2749 } 2750 2751 /** 2752 * fcoe_logo_resp() - FCoE specific LOGO response handler 2753 * @seq: active sequence in the LOGO exchange 2754 * @fp: response frame, or error encoded in a pointer (timeout) 2755 * @arg: pointer the the fcoe_ctlr structure 2756 * 2757 * This handles MAC address management for FCoE, then passes control on to 2758 * the libfc LOGO response handler. 2759 */ 2760 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2761 { 2762 struct fc_lport *lport = arg; 2763 static u8 zero_mac[ETH_ALEN] = { 0 }; 2764 2765 if (!IS_ERR(fp)) 2766 fcoe_update_src_mac(lport, zero_mac); 2767 fc_lport_logo_resp(seq, fp, lport); 2768 } 2769 2770 /** 2771 * fcoe_elsct_send - FCoE specific ELS handler 2772 * 2773 * This does special case handling of FIP encapsualted ELS exchanges for FCoE, 2774 * using FCoE specific response handlers and passing the FIP controller as 2775 * the argument (the lport is still available from the exchange). 2776 * 2777 * Most of the work here is just handed off to the libfc routine. 2778 */ 2779 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did, 2780 struct fc_frame *fp, unsigned int op, 2781 void (*resp)(struct fc_seq *, 2782 struct fc_frame *, 2783 void *), 2784 void *arg, u32 timeout) 2785 { 2786 struct fcoe_port *port = lport_priv(lport); 2787 struct fcoe_interface *fcoe = port->priv; 2788 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 2789 struct fc_frame_header *fh = fc_frame_header_get(fp); 2790 2791 switch (op) { 2792 case ELS_FLOGI: 2793 case ELS_FDISC: 2794 if (lport->point_to_multipoint) 2795 break; 2796 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, 2797 fip, timeout); 2798 case ELS_LOGO: 2799 /* only hook onto fabric logouts, not port logouts */ 2800 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) 2801 break; 2802 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, 2803 lport, timeout); 2804 } 2805 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); 2806 } 2807 2808 /** 2809 * fcoe_vport_create() - create an fc_host/scsi_host for a vport 2810 * @vport: fc_vport object to create a new fc_host for 2811 * @disabled: start the new fc_host in a disabled state by default? 2812 * 2813 * Returns: 0 for success 2814 */ 2815 static int fcoe_vport_create(struct fc_vport *vport, bool disabled) 2816 { 2817 struct Scsi_Host *shost = vport_to_shost(vport); 2818 struct fc_lport *n_port = shost_priv(shost); 2819 struct fcoe_port *port = lport_priv(n_port); 2820 struct fcoe_interface *fcoe = port->priv; 2821 struct net_device *netdev = fcoe->netdev; 2822 struct fc_lport *vn_port; 2823 int rc; 2824 char buf[32]; 2825 2826 rc = fcoe_validate_vport_create(vport); 2827 if (rc) { 2828 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf)); 2829 printk(KERN_ERR "fcoe: Failed to create vport, " 2830 "WWPN (0x%s) already exists\n", 2831 buf); 2832 return rc; 2833 } 2834 2835 mutex_lock(&fcoe_config_mutex); 2836 rtnl_lock(); 2837 vn_port = fcoe_if_create(fcoe, &vport->dev, 1); 2838 rtnl_unlock(); 2839 mutex_unlock(&fcoe_config_mutex); 2840 2841 if (IS_ERR(vn_port)) { 2842 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n", 2843 netdev->name); 2844 return -EIO; 2845 } 2846 2847 if (disabled) { 2848 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2849 } else { 2850 vn_port->boot_time = jiffies; 2851 fc_fabric_login(vn_port); 2852 fc_vport_setlink(vn_port); 2853 } 2854 return 0; 2855 } 2856 2857 /** 2858 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport 2859 * @vport: fc_vport object that is being destroyed 2860 * 2861 * Returns: 0 for success 2862 */ 2863 static int fcoe_vport_destroy(struct fc_vport *vport) 2864 { 2865 struct Scsi_Host *shost = vport_to_shost(vport); 2866 struct fc_lport *n_port = shost_priv(shost); 2867 struct fc_lport *vn_port = vport->dd_data; 2868 2869 mutex_lock(&n_port->lp_mutex); 2870 list_del(&vn_port->list); 2871 mutex_unlock(&n_port->lp_mutex); 2872 2873 mutex_lock(&fcoe_config_mutex); 2874 fcoe_if_destroy(vn_port); 2875 mutex_unlock(&fcoe_config_mutex); 2876 2877 return 0; 2878 } 2879 2880 /** 2881 * fcoe_vport_disable() - change vport state 2882 * @vport: vport to bring online/offline 2883 * @disable: should the vport be disabled? 2884 */ 2885 static int fcoe_vport_disable(struct fc_vport *vport, bool disable) 2886 { 2887 struct fc_lport *lport = vport->dd_data; 2888 2889 if (disable) { 2890 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2891 fc_fabric_logoff(lport); 2892 } else { 2893 lport->boot_time = jiffies; 2894 fc_fabric_login(lport); 2895 fc_vport_setlink(lport); 2896 } 2897 2898 return 0; 2899 } 2900 2901 /** 2902 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name 2903 * @vport: fc_vport with a new symbolic name string 2904 * 2905 * After generating a new symbolic name string, a new RSPN_ID request is 2906 * sent to the name server. There is no response handler, so if it fails 2907 * for some reason it will not be retried. 2908 */ 2909 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport) 2910 { 2911 struct fc_lport *lport = vport->dd_data; 2912 struct fc_frame *fp; 2913 size_t len; 2914 2915 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 2916 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION, 2917 fcoe_netdev(lport)->name, vport->symbolic_name); 2918 2919 if (lport->state != LPORT_ST_READY) 2920 return; 2921 2922 len = strnlen(fc_host_symbolic_name(lport->host), 255); 2923 fp = fc_frame_alloc(lport, 2924 sizeof(struct fc_ct_hdr) + 2925 sizeof(struct fc_ns_rspn) + len); 2926 if (!fp) 2927 return; 2928 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID, 2929 NULL, NULL, 3 * lport->r_a_tov); 2930 } 2931 2932 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev) 2933 { 2934 struct fcoe_ctlr_device *ctlr_dev = 2935 fcoe_fcf_dev_to_ctlr_dev(fcf_dev); 2936 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev); 2937 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr); 2938 2939 fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev); 2940 } 2941 2942 /** 2943 * fcoe_set_port_id() - Callback from libfc when Port_ID is set. 2944 * @lport: the local port 2945 * @port_id: the port ID 2946 * @fp: the received frame, if any, that caused the port_id to be set. 2947 * 2948 * This routine handles the case where we received a FLOGI and are 2949 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi() 2950 * so it can set the non-mapped mode and gateway address. 2951 * 2952 * The FLOGI LS_ACC is handled by fcoe_flogi_resp(). 2953 */ 2954 static void fcoe_set_port_id(struct fc_lport *lport, 2955 u32 port_id, struct fc_frame *fp) 2956 { 2957 struct fcoe_port *port = lport_priv(lport); 2958 struct fcoe_interface *fcoe = port->priv; 2959 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 2960 2961 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI) 2962 fcoe_ctlr_recv_flogi(ctlr, lport, fp); 2963 } 2964