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 .change_queue_type = scsi_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 .use_blk_tags = 1, 292 .track_queue_depth = 1, 293 }; 294 295 /** 296 * fcoe_interface_setup() - Setup a FCoE interface 297 * @fcoe: The new FCoE interface 298 * @netdev: The net device that the fcoe interface is on 299 * 300 * Returns : 0 for success 301 * Locking: must be called with the RTNL mutex held 302 */ 303 static int fcoe_interface_setup(struct fcoe_interface *fcoe, 304 struct net_device *netdev) 305 { 306 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 307 struct netdev_hw_addr *ha; 308 struct net_device *real_dev; 309 u8 flogi_maddr[ETH_ALEN]; 310 const struct net_device_ops *ops; 311 312 fcoe->netdev = netdev; 313 314 /* Let LLD initialize for FCoE */ 315 ops = netdev->netdev_ops; 316 if (ops->ndo_fcoe_enable) { 317 if (ops->ndo_fcoe_enable(netdev)) 318 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" 319 " specific feature for LLD.\n"); 320 } 321 322 /* Do not support for bonding device */ 323 if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) { 324 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n"); 325 return -EOPNOTSUPP; 326 } 327 328 /* look for SAN MAC address, if multiple SAN MACs exist, only 329 * use the first one for SPMA */ 330 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ? 331 vlan_dev_real_dev(netdev) : netdev; 332 fcoe->realdev = real_dev; 333 rcu_read_lock(); 334 for_each_dev_addr(real_dev, ha) { 335 if ((ha->type == NETDEV_HW_ADDR_T_SAN) && 336 (is_valid_ether_addr(ha->addr))) { 337 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); 338 fip->spma = 1; 339 break; 340 } 341 } 342 rcu_read_unlock(); 343 344 /* setup Source Mac Address */ 345 if (!fip->spma) 346 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); 347 348 /* 349 * Add FCoE MAC address as second unicast MAC address 350 * or enter promiscuous mode if not capable of listening 351 * for multiple unicast MACs. 352 */ 353 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 354 dev_uc_add(netdev, flogi_maddr); 355 if (fip->spma) 356 dev_uc_add(netdev, fip->ctl_src_addr); 357 if (fip->mode == FIP_MODE_VN2VN) { 358 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS); 359 dev_mc_add(netdev, FIP_ALL_P2P_MACS); 360 } else 361 dev_mc_add(netdev, FIP_ALL_ENODE_MACS); 362 363 /* 364 * setup the receive function from ethernet driver 365 * on the ethertype for the given device 366 */ 367 fcoe->fcoe_packet_type.func = fcoe_rcv; 368 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); 369 fcoe->fcoe_packet_type.dev = netdev; 370 dev_add_pack(&fcoe->fcoe_packet_type); 371 372 fcoe->fip_packet_type.func = fcoe_fip_recv; 373 fcoe->fip_packet_type.type = htons(ETH_P_FIP); 374 fcoe->fip_packet_type.dev = netdev; 375 dev_add_pack(&fcoe->fip_packet_type); 376 377 return 0; 378 } 379 380 /** 381 * fcoe_interface_create() - Create a FCoE interface on a net device 382 * @netdev: The net device to create the FCoE interface on 383 * @fip_mode: The mode to use for FIP 384 * 385 * Returns: pointer to a struct fcoe_interface or NULL on error 386 */ 387 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev, 388 enum fip_state fip_mode) 389 { 390 struct fcoe_ctlr_device *ctlr_dev; 391 struct fcoe_ctlr *ctlr; 392 struct fcoe_interface *fcoe; 393 int size; 394 int err; 395 396 if (!try_module_get(THIS_MODULE)) { 397 FCOE_NETDEV_DBG(netdev, 398 "Could not get a reference to the module\n"); 399 fcoe = ERR_PTR(-EBUSY); 400 goto out; 401 } 402 403 size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface); 404 ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ, 405 size); 406 if (!ctlr_dev) { 407 FCOE_DBG("Failed to add fcoe_ctlr_device\n"); 408 fcoe = ERR_PTR(-ENOMEM); 409 goto out_putmod; 410 } 411 412 ctlr = fcoe_ctlr_device_priv(ctlr_dev); 413 ctlr->cdev = ctlr_dev; 414 fcoe = fcoe_ctlr_priv(ctlr); 415 416 dev_hold(netdev); 417 418 /* 419 * Initialize FIP. 420 */ 421 fcoe_ctlr_init(ctlr, fip_mode); 422 ctlr->send = fcoe_fip_send; 423 ctlr->update_mac = fcoe_update_src_mac; 424 ctlr->get_src_addr = fcoe_get_src_mac; 425 426 err = fcoe_interface_setup(fcoe, netdev); 427 if (err) { 428 fcoe_ctlr_destroy(ctlr); 429 fcoe_ctlr_device_delete(ctlr_dev); 430 dev_put(netdev); 431 fcoe = ERR_PTR(err); 432 goto out_putmod; 433 } 434 435 goto out; 436 437 out_putmod: 438 module_put(THIS_MODULE); 439 out: 440 return fcoe; 441 } 442 443 /** 444 * fcoe_interface_remove() - remove FCoE interface from netdev 445 * @fcoe: The FCoE interface to be cleaned up 446 * 447 * Caller must be holding the RTNL mutex 448 */ 449 static void fcoe_interface_remove(struct fcoe_interface *fcoe) 450 { 451 struct net_device *netdev = fcoe->netdev; 452 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 453 u8 flogi_maddr[ETH_ALEN]; 454 const struct net_device_ops *ops; 455 456 /* 457 * Don't listen for Ethernet packets anymore. 458 * synchronize_net() ensures that the packet handlers are not running 459 * on another CPU. dev_remove_pack() would do that, this calls the 460 * unsyncronized version __dev_remove_pack() to avoid multiple delays. 461 */ 462 __dev_remove_pack(&fcoe->fcoe_packet_type); 463 __dev_remove_pack(&fcoe->fip_packet_type); 464 synchronize_net(); 465 466 /* Delete secondary MAC addresses */ 467 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 468 dev_uc_del(netdev, flogi_maddr); 469 if (fip->spma) 470 dev_uc_del(netdev, fip->ctl_src_addr); 471 if (fip->mode == FIP_MODE_VN2VN) { 472 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS); 473 dev_mc_del(netdev, FIP_ALL_P2P_MACS); 474 } else 475 dev_mc_del(netdev, FIP_ALL_ENODE_MACS); 476 477 /* Tell the LLD we are done w/ FCoE */ 478 ops = netdev->netdev_ops; 479 if (ops->ndo_fcoe_disable) { 480 if (ops->ndo_fcoe_disable(netdev)) 481 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" 482 " specific feature for LLD.\n"); 483 } 484 fcoe->removed = 1; 485 } 486 487 488 /** 489 * fcoe_interface_cleanup() - Clean up a FCoE interface 490 * @fcoe: The FCoE interface to be cleaned up 491 */ 492 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe) 493 { 494 struct net_device *netdev = fcoe->netdev; 495 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe); 496 497 rtnl_lock(); 498 if (!fcoe->removed) 499 fcoe_interface_remove(fcoe); 500 rtnl_unlock(); 501 502 /* Release the self-reference taken during fcoe_interface_create() */ 503 /* tear-down the FCoE controller */ 504 fcoe_ctlr_destroy(fip); 505 scsi_host_put(fip->lp->host); 506 dev_put(netdev); 507 module_put(THIS_MODULE); 508 } 509 510 /** 511 * fcoe_fip_recv() - Handler for received FIP frames 512 * @skb: The receive skb 513 * @netdev: The associated net device 514 * @ptype: The packet_type structure which was used to register this handler 515 * @orig_dev: The original net_device the the skb was received on. 516 * (in case dev is a bond) 517 * 518 * Returns: 0 for success 519 */ 520 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev, 521 struct packet_type *ptype, 522 struct net_device *orig_dev) 523 { 524 struct fcoe_interface *fcoe; 525 struct fcoe_ctlr *ctlr; 526 527 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); 528 ctlr = fcoe_to_ctlr(fcoe); 529 fcoe_ctlr_recv(ctlr, skb); 530 return 0; 531 } 532 533 /** 534 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame 535 * @port: The FCoE port 536 * @skb: The FIP/FCoE packet to be sent 537 */ 538 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb) 539 { 540 if (port->fcoe_pending_queue.qlen) 541 fcoe_check_wait_queue(port->lport, skb); 542 else if (fcoe_start_io(skb)) 543 fcoe_check_wait_queue(port->lport, skb); 544 } 545 546 /** 547 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame 548 * @fip: The FCoE controller 549 * @skb: The FIP packet to be sent 550 */ 551 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 552 { 553 skb->dev = fcoe_from_ctlr(fip)->netdev; 554 fcoe_port_send(lport_priv(fip->lp), skb); 555 } 556 557 /** 558 * fcoe_update_src_mac() - Update the Ethernet MAC filters 559 * @lport: The local port to update the source MAC on 560 * @addr: Unicast MAC address to add 561 * 562 * Remove any previously-set unicast MAC filter. 563 * Add secondary FCoE MAC address filter for our OUI. 564 */ 565 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) 566 { 567 struct fcoe_port *port = lport_priv(lport); 568 struct fcoe_interface *fcoe = port->priv; 569 570 if (!is_zero_ether_addr(port->data_src_addr)) 571 dev_uc_del(fcoe->netdev, port->data_src_addr); 572 if (!is_zero_ether_addr(addr)) 573 dev_uc_add(fcoe->netdev, addr); 574 memcpy(port->data_src_addr, addr, ETH_ALEN); 575 } 576 577 /** 578 * fcoe_get_src_mac() - return the Ethernet source address for an lport 579 * @lport: libfc lport 580 */ 581 static u8 *fcoe_get_src_mac(struct fc_lport *lport) 582 { 583 struct fcoe_port *port = lport_priv(lport); 584 585 return port->data_src_addr; 586 } 587 588 /** 589 * fcoe_lport_config() - Set up a local port 590 * @lport: The local port to be setup 591 * 592 * Returns: 0 for success 593 */ 594 static int fcoe_lport_config(struct fc_lport *lport) 595 { 596 lport->link_up = 0; 597 lport->qfull = 0; 598 lport->max_retry_count = 3; 599 lport->max_rport_retry_count = 3; 600 lport->e_d_tov = 2 * 1000; /* FC-FS default */ 601 lport->r_a_tov = 2 * 2 * 1000; 602 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | 603 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); 604 lport->does_npiv = 1; 605 606 fc_lport_init_stats(lport); 607 608 /* lport fc_lport related configuration */ 609 fc_lport_config(lport); 610 611 /* offload related configuration */ 612 lport->crc_offload = 0; 613 lport->seq_offload = 0; 614 lport->lro_enabled = 0; 615 lport->lro_xid = 0; 616 lport->lso_max = 0; 617 618 return 0; 619 } 620 621 /** 622 * fcoe_netdev_features_change - Updates the lport's offload flags based 623 * on the LLD netdev's FCoE feature flags 624 */ 625 static void fcoe_netdev_features_change(struct fc_lport *lport, 626 struct net_device *netdev) 627 { 628 mutex_lock(&lport->lp_mutex); 629 630 if (netdev->features & NETIF_F_SG) 631 lport->sg_supp = 1; 632 else 633 lport->sg_supp = 0; 634 635 if (netdev->features & NETIF_F_FCOE_CRC) { 636 lport->crc_offload = 1; 637 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); 638 } else { 639 lport->crc_offload = 0; 640 } 641 642 if (netdev->features & NETIF_F_FSO) { 643 lport->seq_offload = 1; 644 lport->lso_max = netdev->gso_max_size; 645 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", 646 lport->lso_max); 647 } else { 648 lport->seq_offload = 0; 649 lport->lso_max = 0; 650 } 651 652 if (netdev->fcoe_ddp_xid) { 653 lport->lro_enabled = 1; 654 lport->lro_xid = netdev->fcoe_ddp_xid; 655 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", 656 lport->lro_xid); 657 } else { 658 lport->lro_enabled = 0; 659 lport->lro_xid = 0; 660 } 661 662 mutex_unlock(&lport->lp_mutex); 663 } 664 665 /** 666 * fcoe_netdev_config() - Set up net devive for SW FCoE 667 * @lport: The local port that is associated with the net device 668 * @netdev: The associated net device 669 * 670 * Must be called after fcoe_lport_config() as it will use local port mutex 671 * 672 * Returns: 0 for success 673 */ 674 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev) 675 { 676 u32 mfs; 677 u64 wwnn, wwpn; 678 struct fcoe_interface *fcoe; 679 struct fcoe_ctlr *ctlr; 680 struct fcoe_port *port; 681 682 /* Setup lport private data to point to fcoe softc */ 683 port = lport_priv(lport); 684 fcoe = port->priv; 685 ctlr = fcoe_to_ctlr(fcoe); 686 687 /* 688 * Determine max frame size based on underlying device and optional 689 * user-configured limit. If the MFS is too low, fcoe_link_ok() 690 * will return 0, so do this first. 691 */ 692 mfs = netdev->mtu; 693 if (netdev->features & NETIF_F_FCOE_MTU) { 694 mfs = FCOE_MTU; 695 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); 696 } 697 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); 698 if (fc_set_mfs(lport, mfs)) 699 return -EINVAL; 700 701 /* offload features support */ 702 fcoe_netdev_features_change(lport, netdev); 703 704 skb_queue_head_init(&port->fcoe_pending_queue); 705 port->fcoe_pending_queue_active = 0; 706 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); 707 708 fcoe_link_speed_update(lport); 709 710 if (!lport->vport) { 711 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN)) 712 wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0); 713 fc_set_wwnn(lport, wwnn); 714 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN)) 715 wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 716 2, 0); 717 fc_set_wwpn(lport, wwpn); 718 } 719 720 return 0; 721 } 722 723 /** 724 * fcoe_shost_config() - Set up the SCSI host associated with a local port 725 * @lport: The local port 726 * @dev: The device associated with the SCSI host 727 * 728 * Must be called after fcoe_lport_config() and fcoe_netdev_config() 729 * 730 * Returns: 0 for success 731 */ 732 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev) 733 { 734 int rc = 0; 735 736 /* lport scsi host config */ 737 lport->host->max_lun = FCOE_MAX_LUN; 738 lport->host->max_id = FCOE_MAX_FCP_TARGET; 739 lport->host->max_channel = 0; 740 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN; 741 742 if (lport->vport) 743 lport->host->transportt = fcoe_vport_scsi_transport; 744 else 745 lport->host->transportt = fcoe_nport_scsi_transport; 746 747 /* add the new host to the SCSI-ml */ 748 rc = scsi_add_host(lport->host, dev); 749 if (rc) { 750 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " 751 "error on scsi_add_host\n"); 752 return rc; 753 } 754 755 if (!lport->vport) 756 fc_host_max_npiv_vports(lport->host) = USHRT_MAX; 757 758 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 759 "%s v%s over %s", FCOE_NAME, FCOE_VERSION, 760 fcoe_netdev(lport)->name); 761 762 return 0; 763 } 764 765 766 /** 767 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE 768 * @lport: The local port that is associated with the net device 769 * @netdev: The associated net device 770 * 771 * Must be called after fcoe_shost_config() as it will use local port mutex 772 * 773 */ 774 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev) 775 { 776 struct fcoe_interface *fcoe; 777 struct fcoe_port *port; 778 struct net_device *realdev; 779 int rc; 780 781 port = lport_priv(lport); 782 fcoe = port->priv; 783 realdev = fcoe->realdev; 784 785 if (!realdev) 786 return; 787 788 /* No FDMI state m/c for NPIV ports */ 789 if (lport->vport) 790 return; 791 792 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) { 793 struct netdev_fcoe_hbainfo *fdmi; 794 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL); 795 if (!fdmi) 796 return; 797 798 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev, 799 fdmi); 800 if (rc) { 801 printk(KERN_INFO "fcoe: Failed to retrieve FDMI " 802 "information from netdev.\n"); 803 return; 804 } 805 806 snprintf(fc_host_serial_number(lport->host), 807 FC_SERIAL_NUMBER_SIZE, 808 "%s", 809 fdmi->serial_number); 810 snprintf(fc_host_manufacturer(lport->host), 811 FC_SERIAL_NUMBER_SIZE, 812 "%s", 813 fdmi->manufacturer); 814 snprintf(fc_host_model(lport->host), 815 FC_SYMBOLIC_NAME_SIZE, 816 "%s", 817 fdmi->model); 818 snprintf(fc_host_model_description(lport->host), 819 FC_SYMBOLIC_NAME_SIZE, 820 "%s", 821 fdmi->model_description); 822 snprintf(fc_host_hardware_version(lport->host), 823 FC_VERSION_STRING_SIZE, 824 "%s", 825 fdmi->hardware_version); 826 snprintf(fc_host_driver_version(lport->host), 827 FC_VERSION_STRING_SIZE, 828 "%s", 829 fdmi->driver_version); 830 snprintf(fc_host_optionrom_version(lport->host), 831 FC_VERSION_STRING_SIZE, 832 "%s", 833 fdmi->optionrom_version); 834 snprintf(fc_host_firmware_version(lport->host), 835 FC_VERSION_STRING_SIZE, 836 "%s", 837 fdmi->firmware_version); 838 839 /* Enable FDMI lport states */ 840 lport->fdmi_enabled = 1; 841 kfree(fdmi); 842 } else { 843 lport->fdmi_enabled = 0; 844 printk(KERN_INFO "fcoe: No FDMI support.\n"); 845 } 846 } 847 848 /** 849 * fcoe_oem_match() - The match routine for the offloaded exchange manager 850 * @fp: The I/O frame 851 * 852 * This routine will be associated with an exchange manager (EM). When 853 * the libfc exchange handling code is looking for an EM to use it will 854 * call this routine and pass it the frame that it wishes to send. This 855 * routine will return True if the associated EM is to be used and False 856 * if the echange code should continue looking for an EM. 857 * 858 * The offload EM that this routine is associated with will handle any 859 * packets that are for SCSI read requests. 860 * 861 * This has been enhanced to work when FCoE stack is operating in target 862 * mode. 863 * 864 * Returns: True for read types I/O, otherwise returns false. 865 */ 866 static bool fcoe_oem_match(struct fc_frame *fp) 867 { 868 struct fc_frame_header *fh = fc_frame_header_get(fp); 869 struct fcp_cmnd *fcp; 870 871 if (fc_fcp_is_read(fr_fsp(fp)) && 872 (fr_fsp(fp)->data_len > fcoe_ddp_min)) 873 return true; 874 else if ((fr_fsp(fp) == NULL) && 875 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) && 876 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { 877 fcp = fc_frame_payload_get(fp, sizeof(*fcp)); 878 if ((fcp->fc_flags & FCP_CFL_WRDATA) && 879 (ntohl(fcp->fc_dl) > fcoe_ddp_min)) 880 return true; 881 } 882 return false; 883 } 884 885 /** 886 * fcoe_em_config() - Allocate and configure an exchange manager 887 * @lport: The local port that the new EM will be associated with 888 * 889 * Returns: 0 on success 890 */ 891 static inline int fcoe_em_config(struct fc_lport *lport) 892 { 893 struct fcoe_port *port = lport_priv(lport); 894 struct fcoe_interface *fcoe = port->priv; 895 struct fcoe_interface *oldfcoe = NULL; 896 struct net_device *old_real_dev, *cur_real_dev; 897 u16 min_xid = FCOE_MIN_XID; 898 u16 max_xid = FCOE_MAX_XID; 899 900 /* 901 * Check if need to allocate an em instance for 902 * offload exchange ids to be shared across all VN_PORTs/lport. 903 */ 904 if (!lport->lro_enabled || !lport->lro_xid || 905 (lport->lro_xid >= max_xid)) { 906 lport->lro_xid = 0; 907 goto skip_oem; 908 } 909 910 /* 911 * Reuse existing offload em instance in case 912 * it is already allocated on real eth device 913 */ 914 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 915 cur_real_dev = vlan_dev_real_dev(fcoe->netdev); 916 else 917 cur_real_dev = fcoe->netdev; 918 919 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { 920 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 921 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); 922 else 923 old_real_dev = oldfcoe->netdev; 924 925 if (cur_real_dev == old_real_dev) { 926 fcoe->oem = oldfcoe->oem; 927 break; 928 } 929 } 930 931 if (fcoe->oem) { 932 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) { 933 printk(KERN_ERR "fcoe_em_config: failed to add " 934 "offload em:%p on interface:%s\n", 935 fcoe->oem, fcoe->netdev->name); 936 return -ENOMEM; 937 } 938 } else { 939 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3, 940 FCOE_MIN_XID, lport->lro_xid, 941 fcoe_oem_match); 942 if (!fcoe->oem) { 943 printk(KERN_ERR "fcoe_em_config: failed to allocate " 944 "em for offload exches on interface:%s\n", 945 fcoe->netdev->name); 946 return -ENOMEM; 947 } 948 } 949 950 /* 951 * Exclude offload EM xid range from next EM xid range. 952 */ 953 min_xid += lport->lro_xid + 1; 954 955 skip_oem: 956 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) { 957 printk(KERN_ERR "fcoe_em_config: failed to " 958 "allocate em on interface %s\n", fcoe->netdev->name); 959 return -ENOMEM; 960 } 961 962 return 0; 963 } 964 965 /** 966 * fcoe_if_destroy() - Tear down a SW FCoE instance 967 * @lport: The local port to be destroyed 968 * 969 */ 970 static void fcoe_if_destroy(struct fc_lport *lport) 971 { 972 struct fcoe_port *port = lport_priv(lport); 973 struct fcoe_interface *fcoe = port->priv; 974 struct net_device *netdev = fcoe->netdev; 975 976 FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); 977 978 /* Logout of the fabric */ 979 fc_fabric_logoff(lport); 980 981 /* Cleanup the fc_lport */ 982 fc_lport_destroy(lport); 983 984 /* Stop the transmit retry timer */ 985 del_timer_sync(&port->timer); 986 987 /* Free existing transmit skbs */ 988 fcoe_clean_pending_queue(lport); 989 990 rtnl_lock(); 991 if (!is_zero_ether_addr(port->data_src_addr)) 992 dev_uc_del(netdev, port->data_src_addr); 993 if (lport->vport) 994 synchronize_net(); 995 else 996 fcoe_interface_remove(fcoe); 997 rtnl_unlock(); 998 999 /* Free queued packets for the per-CPU receive threads */ 1000 fcoe_percpu_clean(lport); 1001 1002 /* Detach from the scsi-ml */ 1003 fc_remove_host(lport->host); 1004 scsi_remove_host(lport->host); 1005 1006 /* Destroy lport scsi_priv */ 1007 fc_fcp_destroy(lport); 1008 1009 /* There are no more rports or I/O, free the EM */ 1010 fc_exch_mgr_free(lport); 1011 1012 /* Free memory used by statistical counters */ 1013 fc_lport_free_stats(lport); 1014 1015 /* 1016 * Release the Scsi_Host for vport but hold on to 1017 * master lport until it fcoe interface fully cleaned-up. 1018 */ 1019 if (lport->vport) 1020 scsi_host_put(lport->host); 1021 } 1022 1023 /** 1024 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device 1025 * @lport: The local port to setup DDP for 1026 * @xid: The exchange ID for this DDP transfer 1027 * @sgl: The scatterlist describing this transfer 1028 * @sgc: The number of sg items 1029 * 1030 * Returns: 0 if the DDP context was not configured 1031 */ 1032 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid, 1033 struct scatterlist *sgl, unsigned int sgc) 1034 { 1035 struct net_device *netdev = fcoe_netdev(lport); 1036 1037 if (netdev->netdev_ops->ndo_fcoe_ddp_setup) 1038 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev, 1039 xid, sgl, 1040 sgc); 1041 1042 return 0; 1043 } 1044 1045 /** 1046 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device 1047 * @lport: The local port to setup DDP for 1048 * @xid: The exchange ID for this DDP transfer 1049 * @sgl: The scatterlist describing this transfer 1050 * @sgc: The number of sg items 1051 * 1052 * Returns: 0 if the DDP context was not configured 1053 */ 1054 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid, 1055 struct scatterlist *sgl, unsigned int sgc) 1056 { 1057 struct net_device *netdev = fcoe_netdev(lport); 1058 1059 if (netdev->netdev_ops->ndo_fcoe_ddp_target) 1060 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid, 1061 sgl, sgc); 1062 1063 return 0; 1064 } 1065 1066 1067 /** 1068 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device 1069 * @lport: The local port to complete DDP on 1070 * @xid: The exchange ID for this DDP transfer 1071 * 1072 * Returns: the length of data that have been completed by DDP 1073 */ 1074 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid) 1075 { 1076 struct net_device *netdev = fcoe_netdev(lport); 1077 1078 if (netdev->netdev_ops->ndo_fcoe_ddp_done) 1079 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid); 1080 return 0; 1081 } 1082 1083 /** 1084 * fcoe_if_create() - Create a FCoE instance on an interface 1085 * @fcoe: The FCoE interface to create a local port on 1086 * @parent: The device pointer to be the parent in sysfs for the SCSI host 1087 * @npiv: Indicates if the port is a vport or not 1088 * 1089 * Creates a fc_lport instance and a Scsi_Host instance and configure them. 1090 * 1091 * Returns: The allocated fc_lport or an error pointer 1092 */ 1093 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, 1094 struct device *parent, int npiv) 1095 { 1096 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1097 struct net_device *netdev = fcoe->netdev; 1098 struct fc_lport *lport, *n_port; 1099 struct fcoe_port *port; 1100 struct Scsi_Host *shost; 1101 int rc; 1102 /* 1103 * parent is only a vport if npiv is 1, 1104 * but we'll only use vport in that case so go ahead and set it 1105 */ 1106 struct fc_vport *vport = dev_to_vport(parent); 1107 1108 FCOE_NETDEV_DBG(netdev, "Create Interface\n"); 1109 1110 if (!npiv) 1111 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port)); 1112 else 1113 lport = libfc_vport_create(vport, sizeof(*port)); 1114 1115 if (!lport) { 1116 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); 1117 rc = -ENOMEM; 1118 goto out; 1119 } 1120 port = lport_priv(lport); 1121 port->lport = lport; 1122 port->priv = fcoe; 1123 port->get_netdev = fcoe_netdev; 1124 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH; 1125 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH; 1126 INIT_WORK(&port->destroy_work, fcoe_destroy_work); 1127 1128 /* 1129 * Need to add the lport to the hostlist 1130 * so we catch NETDEV_CHANGE events. 1131 */ 1132 fcoe_hostlist_add(lport); 1133 1134 /* configure a fc_lport including the exchange manager */ 1135 rc = fcoe_lport_config(lport); 1136 if (rc) { 1137 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " 1138 "interface\n"); 1139 goto out_host_put; 1140 } 1141 1142 if (npiv) { 1143 FCOE_NETDEV_DBG(netdev, "Setting vport names, " 1144 "%16.16llx %16.16llx\n", 1145 vport->node_name, vport->port_name); 1146 fc_set_wwnn(lport, vport->node_name); 1147 fc_set_wwpn(lport, vport->port_name); 1148 } 1149 1150 /* configure lport network properties */ 1151 rc = fcoe_netdev_config(lport, netdev); 1152 if (rc) { 1153 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " 1154 "interface\n"); 1155 goto out_lp_destroy; 1156 } 1157 1158 /* configure lport scsi host properties */ 1159 rc = fcoe_shost_config(lport, parent); 1160 if (rc) { 1161 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " 1162 "interface\n"); 1163 goto out_lp_destroy; 1164 } 1165 1166 /* Initialize the library */ 1167 rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1); 1168 if (rc) { 1169 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " 1170 "interface\n"); 1171 goto out_lp_destroy; 1172 } 1173 1174 /* Initialized FDMI information */ 1175 fcoe_fdmi_info(lport, netdev); 1176 1177 /* 1178 * fcoe_em_alloc() and fcoe_hostlist_add() both 1179 * need to be atomic with respect to other changes to the 1180 * hostlist since fcoe_em_alloc() looks for an existing EM 1181 * instance on host list updated by fcoe_hostlist_add(). 1182 * 1183 * This is currently handled through the fcoe_config_mutex 1184 * begin held. 1185 */ 1186 if (!npiv) 1187 /* lport exch manager allocation */ 1188 rc = fcoe_em_config(lport); 1189 else { 1190 shost = vport_to_shost(vport); 1191 n_port = shost_priv(shost); 1192 rc = fc_exch_mgr_list_clone(n_port, lport); 1193 } 1194 1195 if (rc) { 1196 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n"); 1197 goto out_lp_destroy; 1198 } 1199 1200 return lport; 1201 1202 out_lp_destroy: 1203 fc_exch_mgr_free(lport); 1204 out_host_put: 1205 fcoe_hostlist_del(lport); 1206 scsi_host_put(lport->host); 1207 out: 1208 return ERR_PTR(rc); 1209 } 1210 1211 /** 1212 * fcoe_if_init() - Initialization routine for fcoe.ko 1213 * 1214 * Attaches the SW FCoE transport to the FC transport 1215 * 1216 * Returns: 0 on success 1217 */ 1218 static int __init fcoe_if_init(void) 1219 { 1220 /* attach to scsi transport */ 1221 fcoe_nport_scsi_transport = 1222 fc_attach_transport(&fcoe_nport_fc_functions); 1223 fcoe_vport_scsi_transport = 1224 fc_attach_transport(&fcoe_vport_fc_functions); 1225 1226 if (!fcoe_nport_scsi_transport) { 1227 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); 1228 return -ENODEV; 1229 } 1230 1231 return 0; 1232 } 1233 1234 /** 1235 * fcoe_if_exit() - Tear down fcoe.ko 1236 * 1237 * Detaches the SW FCoE transport from the FC transport 1238 * 1239 * Returns: 0 on success 1240 */ 1241 static int __exit fcoe_if_exit(void) 1242 { 1243 fc_release_transport(fcoe_nport_scsi_transport); 1244 fc_release_transport(fcoe_vport_scsi_transport); 1245 fcoe_nport_scsi_transport = NULL; 1246 fcoe_vport_scsi_transport = NULL; 1247 return 0; 1248 } 1249 1250 /** 1251 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU 1252 * @cpu: The CPU index of the CPU to create a receive thread for 1253 */ 1254 static void fcoe_percpu_thread_create(unsigned int cpu) 1255 { 1256 struct fcoe_percpu_s *p; 1257 struct task_struct *thread; 1258 1259 p = &per_cpu(fcoe_percpu, cpu); 1260 1261 thread = kthread_create_on_node(fcoe_percpu_receive_thread, 1262 (void *)p, cpu_to_node(cpu), 1263 "fcoethread/%d", cpu); 1264 1265 if (likely(!IS_ERR(thread))) { 1266 kthread_bind(thread, cpu); 1267 wake_up_process(thread); 1268 1269 spin_lock_bh(&p->fcoe_rx_list.lock); 1270 p->thread = thread; 1271 spin_unlock_bh(&p->fcoe_rx_list.lock); 1272 } 1273 } 1274 1275 /** 1276 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU 1277 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed 1278 * 1279 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the 1280 * current CPU's Rx thread. If the thread being destroyed is bound to 1281 * the CPU processing this context the skbs will be freed. 1282 */ 1283 static void fcoe_percpu_thread_destroy(unsigned int cpu) 1284 { 1285 struct fcoe_percpu_s *p; 1286 struct task_struct *thread; 1287 struct page *crc_eof; 1288 struct sk_buff *skb; 1289 #ifdef CONFIG_SMP 1290 struct fcoe_percpu_s *p0; 1291 unsigned targ_cpu = get_cpu(); 1292 #endif /* CONFIG_SMP */ 1293 1294 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); 1295 1296 /* Prevent any new skbs from being queued for this CPU. */ 1297 p = &per_cpu(fcoe_percpu, cpu); 1298 spin_lock_bh(&p->fcoe_rx_list.lock); 1299 thread = p->thread; 1300 p->thread = NULL; 1301 crc_eof = p->crc_eof_page; 1302 p->crc_eof_page = NULL; 1303 p->crc_eof_offset = 0; 1304 spin_unlock_bh(&p->fcoe_rx_list.lock); 1305 1306 #ifdef CONFIG_SMP 1307 /* 1308 * Don't bother moving the skb's if this context is running 1309 * on the same CPU that is having its thread destroyed. This 1310 * can easily happen when the module is removed. 1311 */ 1312 if (cpu != targ_cpu) { 1313 p0 = &per_cpu(fcoe_percpu, targ_cpu); 1314 spin_lock_bh(&p0->fcoe_rx_list.lock); 1315 if (p0->thread) { 1316 FCOE_DBG("Moving frames from CPU %d to CPU %d\n", 1317 cpu, targ_cpu); 1318 1319 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1320 __skb_queue_tail(&p0->fcoe_rx_list, skb); 1321 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1322 } else { 1323 /* 1324 * The targeted CPU is not initialized and cannot accept 1325 * new skbs. Unlock the targeted CPU and drop the skbs 1326 * on the CPU that is going offline. 1327 */ 1328 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1329 kfree_skb(skb); 1330 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1331 } 1332 } else { 1333 /* 1334 * This scenario occurs when the module is being removed 1335 * and all threads are being destroyed. skbs will continue 1336 * to be shifted from the CPU thread that is being removed 1337 * to the CPU thread associated with the CPU that is processing 1338 * the module removal. Once there is only one CPU Rx thread it 1339 * will reach this case and we will drop all skbs and later 1340 * stop the thread. 1341 */ 1342 spin_lock_bh(&p->fcoe_rx_list.lock); 1343 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1344 kfree_skb(skb); 1345 spin_unlock_bh(&p->fcoe_rx_list.lock); 1346 } 1347 put_cpu(); 1348 #else 1349 /* 1350 * This a non-SMP scenario where the singular Rx thread is 1351 * being removed. Free all skbs and stop the thread. 1352 */ 1353 spin_lock_bh(&p->fcoe_rx_list.lock); 1354 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1355 kfree_skb(skb); 1356 spin_unlock_bh(&p->fcoe_rx_list.lock); 1357 #endif 1358 1359 if (thread) 1360 kthread_stop(thread); 1361 1362 if (crc_eof) 1363 put_page(crc_eof); 1364 } 1365 1366 /** 1367 * fcoe_cpu_callback() - Handler for CPU hotplug events 1368 * @nfb: The callback data block 1369 * @action: The event triggering the callback 1370 * @hcpu: The index of the CPU that the event is for 1371 * 1372 * This creates or destroys per-CPU data for fcoe 1373 * 1374 * Returns NOTIFY_OK always. 1375 */ 1376 static int fcoe_cpu_callback(struct notifier_block *nfb, 1377 unsigned long action, void *hcpu) 1378 { 1379 unsigned cpu = (unsigned long)hcpu; 1380 1381 switch (action) { 1382 case CPU_ONLINE: 1383 case CPU_ONLINE_FROZEN: 1384 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); 1385 fcoe_percpu_thread_create(cpu); 1386 break; 1387 case CPU_DEAD: 1388 case CPU_DEAD_FROZEN: 1389 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); 1390 fcoe_percpu_thread_destroy(cpu); 1391 break; 1392 default: 1393 break; 1394 } 1395 return NOTIFY_OK; 1396 } 1397 1398 /** 1399 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming 1400 * command. 1401 * 1402 * This routine selects next CPU based on cpumask to distribute 1403 * incoming requests in round robin. 1404 * 1405 * Returns: int CPU number 1406 */ 1407 static inline unsigned int fcoe_select_cpu(void) 1408 { 1409 static unsigned int selected_cpu; 1410 1411 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); 1412 if (selected_cpu >= nr_cpu_ids) 1413 selected_cpu = cpumask_first(cpu_online_mask); 1414 1415 return selected_cpu; 1416 } 1417 1418 /** 1419 * fcoe_rcv() - Receive packets from a net device 1420 * @skb: The received packet 1421 * @netdev: The net device that the packet was received on 1422 * @ptype: The packet type context 1423 * @olddev: The last device net device 1424 * 1425 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a 1426 * FC frame and passes the frame to libfc. 1427 * 1428 * Returns: 0 for success 1429 */ 1430 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, 1431 struct packet_type *ptype, struct net_device *olddev) 1432 { 1433 struct fc_lport *lport; 1434 struct fcoe_rcv_info *fr; 1435 struct fcoe_ctlr *ctlr; 1436 struct fcoe_interface *fcoe; 1437 struct fc_frame_header *fh; 1438 struct fcoe_percpu_s *fps; 1439 struct ethhdr *eh; 1440 unsigned int cpu; 1441 1442 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); 1443 ctlr = fcoe_to_ctlr(fcoe); 1444 lport = ctlr->lp; 1445 if (unlikely(!lport)) { 1446 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n"); 1447 goto err2; 1448 } 1449 if (!lport->link_up) 1450 goto err2; 1451 1452 FCOE_NETDEV_DBG(netdev, 1453 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n", 1454 skb->len, skb->data_len, skb->head, skb->data, 1455 skb_tail_pointer(skb), skb_end_pointer(skb), 1456 skb->csum, skb->dev ? skb->dev->name : "<NULL>"); 1457 1458 1459 skb = skb_share_check(skb, GFP_ATOMIC); 1460 1461 if (skb == NULL) 1462 return NET_RX_DROP; 1463 1464 eh = eth_hdr(skb); 1465 1466 if (is_fip_mode(ctlr) && 1467 !ether_addr_equal(eh->h_source, ctlr->dest_addr)) { 1468 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n", 1469 eh->h_source); 1470 goto err; 1471 } 1472 1473 /* 1474 * Check for minimum frame length, and make sure required FCoE 1475 * and FC headers are pulled into the linear data area. 1476 */ 1477 if (unlikely((skb->len < FCOE_MIN_FRAME) || 1478 !pskb_may_pull(skb, FCOE_HEADER_LEN))) 1479 goto err; 1480 1481 skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); 1482 fh = (struct fc_frame_header *) skb_transport_header(skb); 1483 1484 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) { 1485 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n", 1486 eh->h_dest); 1487 goto err; 1488 } 1489 1490 fr = fcoe_dev_from_skb(skb); 1491 fr->fr_dev = lport; 1492 1493 /* 1494 * In case the incoming frame's exchange is originated from 1495 * the initiator, then received frame's exchange id is ANDed 1496 * with fc_cpu_mask bits to get the same cpu on which exchange 1497 * was originated, otherwise select cpu using rx exchange id 1498 * or fcoe_select_cpu(). 1499 */ 1500 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) 1501 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; 1502 else { 1503 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN) 1504 cpu = fcoe_select_cpu(); 1505 else 1506 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask; 1507 } 1508 1509 if (cpu >= nr_cpu_ids) 1510 goto err; 1511 1512 fps = &per_cpu(fcoe_percpu, cpu); 1513 spin_lock(&fps->fcoe_rx_list.lock); 1514 if (unlikely(!fps->thread)) { 1515 /* 1516 * The targeted CPU is not ready, let's target 1517 * the first CPU now. For non-SMP systems this 1518 * will check the same CPU twice. 1519 */ 1520 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread " 1521 "ready for incoming skb- using first online " 1522 "CPU.\n"); 1523 1524 spin_unlock(&fps->fcoe_rx_list.lock); 1525 cpu = cpumask_first(cpu_online_mask); 1526 fps = &per_cpu(fcoe_percpu, cpu); 1527 spin_lock(&fps->fcoe_rx_list.lock); 1528 if (!fps->thread) { 1529 spin_unlock(&fps->fcoe_rx_list.lock); 1530 goto err; 1531 } 1532 } 1533 1534 /* 1535 * We now have a valid CPU that we're targeting for 1536 * this skb. We also have this receive thread locked, 1537 * so we're free to queue skbs into it's queue. 1538 */ 1539 1540 /* 1541 * Note: We used to have a set of conditions under which we would 1542 * call fcoe_recv_frame directly, rather than queuing to the rx list 1543 * as it could save a few cycles, but doing so is prohibited, as 1544 * fcoe_recv_frame has several paths that may sleep, which is forbidden 1545 * in softirq context. 1546 */ 1547 __skb_queue_tail(&fps->fcoe_rx_list, skb); 1548 if (fps->thread->state == TASK_INTERRUPTIBLE) 1549 wake_up_process(fps->thread); 1550 spin_unlock(&fps->fcoe_rx_list.lock); 1551 1552 return NET_RX_SUCCESS; 1553 err: 1554 per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++; 1555 put_cpu(); 1556 err2: 1557 kfree_skb(skb); 1558 return NET_RX_DROP; 1559 } 1560 1561 /** 1562 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC 1563 * @skb: The packet to be transmitted 1564 * @tlen: The total length of the trailer 1565 * 1566 * Returns: 0 for success 1567 */ 1568 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) 1569 { 1570 struct fcoe_percpu_s *fps; 1571 int rc; 1572 1573 fps = &get_cpu_var(fcoe_percpu); 1574 rc = fcoe_get_paged_crc_eof(skb, tlen, fps); 1575 put_cpu_var(fcoe_percpu); 1576 1577 return rc; 1578 } 1579 1580 /** 1581 * fcoe_xmit() - Transmit a FCoE frame 1582 * @lport: The local port that the frame is to be transmitted for 1583 * @fp: The frame to be transmitted 1584 * 1585 * Return: 0 for success 1586 */ 1587 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp) 1588 { 1589 int wlen; 1590 u32 crc; 1591 struct ethhdr *eh; 1592 struct fcoe_crc_eof *cp; 1593 struct sk_buff *skb; 1594 struct fc_stats *stats; 1595 struct fc_frame_header *fh; 1596 unsigned int hlen; /* header length implies the version */ 1597 unsigned int tlen; /* trailer length */ 1598 unsigned int elen; /* eth header, may include vlan */ 1599 struct fcoe_port *port = lport_priv(lport); 1600 struct fcoe_interface *fcoe = port->priv; 1601 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); 1602 u8 sof, eof; 1603 struct fcoe_hdr *hp; 1604 1605 WARN_ON((fr_len(fp) % sizeof(u32)) != 0); 1606 1607 fh = fc_frame_header_get(fp); 1608 skb = fp_skb(fp); 1609 wlen = skb->len / FCOE_WORD_TO_BYTE; 1610 1611 if (!lport->link_up) { 1612 kfree_skb(skb); 1613 return 0; 1614 } 1615 1616 if (unlikely(fh->fh_type == FC_TYPE_ELS) && 1617 fcoe_ctlr_els_send(ctlr, lport, skb)) 1618 return 0; 1619 1620 sof = fr_sof(fp); 1621 eof = fr_eof(fp); 1622 1623 elen = sizeof(struct ethhdr); 1624 hlen = sizeof(struct fcoe_hdr); 1625 tlen = sizeof(struct fcoe_crc_eof); 1626 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; 1627 1628 /* crc offload */ 1629 if (likely(lport->crc_offload)) { 1630 skb->ip_summed = CHECKSUM_UNNECESSARY; 1631 skb->csum_start = skb_headroom(skb); 1632 skb->csum_offset = skb->len; 1633 crc = 0; 1634 } else { 1635 skb->ip_summed = CHECKSUM_NONE; 1636 crc = fcoe_fc_crc(fp); 1637 } 1638 1639 /* copy port crc and eof to the skb buff */ 1640 if (skb_is_nonlinear(skb)) { 1641 skb_frag_t *frag; 1642 if (fcoe_alloc_paged_crc_eof(skb, tlen)) { 1643 kfree_skb(skb); 1644 return -ENOMEM; 1645 } 1646 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; 1647 cp = kmap_atomic(skb_frag_page(frag)) 1648 + frag->page_offset; 1649 } else { 1650 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); 1651 } 1652 1653 memset(cp, 0, sizeof(*cp)); 1654 cp->fcoe_eof = eof; 1655 cp->fcoe_crc32 = cpu_to_le32(~crc); 1656 1657 if (skb_is_nonlinear(skb)) { 1658 kunmap_atomic(cp); 1659 cp = NULL; 1660 } 1661 1662 /* adjust skb network/transport offsets to match mac/fcoe/port */ 1663 skb_push(skb, elen + hlen); 1664 skb_reset_mac_header(skb); 1665 skb_reset_network_header(skb); 1666 skb->mac_len = elen; 1667 skb->protocol = htons(ETH_P_FCOE); 1668 skb->priority = fcoe->priority; 1669 1670 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN && 1671 fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) { 1672 /* must set skb->dev before calling vlan_put_tag */ 1673 skb->dev = fcoe->realdev; 1674 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 1675 vlan_dev_vlan_id(fcoe->netdev)); 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