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 45 #include <scsi/libfc.h> 46 #include <scsi/fc_frame.h> 47 #include <scsi/libfcoe.h> 48 49 #include "fcoe.h" 50 51 MODULE_AUTHOR("Open-FCoE.org"); 52 MODULE_DESCRIPTION("FCoE"); 53 MODULE_LICENSE("GPL v2"); 54 55 /* Performance tuning parameters for fcoe */ 56 static unsigned int fcoe_ddp_min = 4096; 57 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR); 58 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ 59 "Direct Data Placement (DDP)."); 60 61 unsigned int fcoe_debug_logging; 62 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR); 63 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 64 65 static DEFINE_MUTEX(fcoe_config_mutex); 66 67 static struct workqueue_struct *fcoe_wq; 68 69 /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */ 70 static DECLARE_COMPLETION(fcoe_flush_completion); 71 72 /* fcoe host list */ 73 /* must only by accessed under the RTNL mutex */ 74 static LIST_HEAD(fcoe_hostlist); 75 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); 76 77 /* Function Prototypes */ 78 static int fcoe_reset(struct Scsi_Host *); 79 static int fcoe_xmit(struct fc_lport *, struct fc_frame *); 80 static int fcoe_rcv(struct sk_buff *, struct net_device *, 81 struct packet_type *, struct net_device *); 82 static int fcoe_percpu_receive_thread(void *); 83 static void fcoe_percpu_clean(struct fc_lport *); 84 static int fcoe_link_speed_update(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 90 static int fcoe_device_notification(struct notifier_block *, ulong, void *); 91 static void fcoe_dev_setup(void); 92 static void fcoe_dev_cleanup(void); 93 static struct fcoe_interface 94 *fcoe_hostlist_lookup_port(const struct net_device *); 95 96 static int fcoe_fip_recv(struct sk_buff *, struct net_device *, 97 struct packet_type *, struct net_device *); 98 99 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *); 100 static void fcoe_update_src_mac(struct fc_lport *, u8 *); 101 static u8 *fcoe_get_src_mac(struct fc_lport *); 102 static void fcoe_destroy_work(struct work_struct *); 103 104 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *, 105 unsigned int); 106 static int fcoe_ddp_done(struct fc_lport *, u16); 107 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *, 108 unsigned int); 109 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *); 110 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 111 ulong event, void *ptr); 112 113 static bool fcoe_match(struct net_device *netdev); 114 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode); 115 static int fcoe_destroy(struct net_device *netdev); 116 static int fcoe_enable(struct net_device *netdev); 117 static int fcoe_disable(struct net_device *netdev); 118 119 static struct fc_seq *fcoe_elsct_send(struct fc_lport *, 120 u32 did, struct fc_frame *, 121 unsigned int op, 122 void (*resp)(struct fc_seq *, 123 struct fc_frame *, 124 void *), 125 void *, u32 timeout); 126 static void fcoe_recv_frame(struct sk_buff *skb); 127 128 static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *); 129 130 /* notification function for packets from net device */ 131 static struct notifier_block fcoe_notifier = { 132 .notifier_call = fcoe_device_notification, 133 }; 134 135 /* notification function for CPU hotplug events */ 136 static struct notifier_block fcoe_cpu_notifier = { 137 .notifier_call = fcoe_cpu_callback, 138 }; 139 140 /* notification function for DCB events */ 141 static struct notifier_block dcb_notifier = { 142 .notifier_call = fcoe_dcb_app_notification, 143 }; 144 145 static struct scsi_transport_template *fcoe_nport_scsi_transport; 146 static struct scsi_transport_template *fcoe_vport_scsi_transport; 147 148 static int fcoe_vport_destroy(struct fc_vport *); 149 static int fcoe_vport_create(struct fc_vport *, bool disabled); 150 static int fcoe_vport_disable(struct fc_vport *, bool disable); 151 static void fcoe_set_vport_symbolic_name(struct fc_vport *); 152 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *); 153 154 static struct libfc_function_template fcoe_libfc_fcn_templ = { 155 .frame_send = fcoe_xmit, 156 .ddp_setup = fcoe_ddp_setup, 157 .ddp_done = fcoe_ddp_done, 158 .ddp_target = fcoe_ddp_target, 159 .elsct_send = fcoe_elsct_send, 160 .get_lesb = fcoe_get_lesb, 161 .lport_set_port_id = fcoe_set_port_id, 162 }; 163 164 static struct fc_function_template fcoe_nport_fc_functions = { 165 .show_host_node_name = 1, 166 .show_host_port_name = 1, 167 .show_host_supported_classes = 1, 168 .show_host_supported_fc4s = 1, 169 .show_host_active_fc4s = 1, 170 .show_host_maxframe_size = 1, 171 .show_host_serial_number = 1, 172 .show_host_manufacturer = 1, 173 .show_host_model = 1, 174 .show_host_model_description = 1, 175 .show_host_hardware_version = 1, 176 .show_host_driver_version = 1, 177 .show_host_firmware_version = 1, 178 .show_host_optionrom_version = 1, 179 180 .show_host_port_id = 1, 181 .show_host_supported_speeds = 1, 182 .get_host_speed = fc_get_host_speed, 183 .show_host_speed = 1, 184 .show_host_port_type = 1, 185 .get_host_port_state = fc_get_host_port_state, 186 .show_host_port_state = 1, 187 .show_host_symbolic_name = 1, 188 189 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), 190 .show_rport_maxframe_size = 1, 191 .show_rport_supported_classes = 1, 192 193 .show_host_fabric_name = 1, 194 .show_starget_node_name = 1, 195 .show_starget_port_name = 1, 196 .show_starget_port_id = 1, 197 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, 198 .show_rport_dev_loss_tmo = 1, 199 .get_fc_host_stats = fc_get_host_stats, 200 .issue_fc_host_lip = fcoe_reset, 201 202 .terminate_rport_io = fc_rport_terminate_io, 203 204 .vport_create = fcoe_vport_create, 205 .vport_delete = fcoe_vport_destroy, 206 .vport_disable = fcoe_vport_disable, 207 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name, 208 209 .bsg_request = fc_lport_bsg_request, 210 }; 211 212 static struct fc_function_template fcoe_vport_fc_functions = { 213 .show_host_node_name = 1, 214 .show_host_port_name = 1, 215 .show_host_supported_classes = 1, 216 .show_host_supported_fc4s = 1, 217 .show_host_active_fc4s = 1, 218 .show_host_maxframe_size = 1, 219 .show_host_serial_number = 1, 220 .show_host_manufacturer = 1, 221 .show_host_model = 1, 222 .show_host_model_description = 1, 223 .show_host_hardware_version = 1, 224 .show_host_driver_version = 1, 225 .show_host_firmware_version = 1, 226 .show_host_optionrom_version = 1, 227 228 .show_host_port_id = 1, 229 .show_host_supported_speeds = 1, 230 .get_host_speed = fc_get_host_speed, 231 .show_host_speed = 1, 232 .show_host_port_type = 1, 233 .get_host_port_state = fc_get_host_port_state, 234 .show_host_port_state = 1, 235 .show_host_symbolic_name = 1, 236 237 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), 238 .show_rport_maxframe_size = 1, 239 .show_rport_supported_classes = 1, 240 241 .show_host_fabric_name = 1, 242 .show_starget_node_name = 1, 243 .show_starget_port_name = 1, 244 .show_starget_port_id = 1, 245 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, 246 .show_rport_dev_loss_tmo = 1, 247 .get_fc_host_stats = fc_get_host_stats, 248 .issue_fc_host_lip = fcoe_reset, 249 250 .terminate_rport_io = fc_rport_terminate_io, 251 252 .bsg_request = fc_lport_bsg_request, 253 }; 254 255 static struct scsi_host_template fcoe_shost_template = { 256 .module = THIS_MODULE, 257 .name = "FCoE Driver", 258 .proc_name = FCOE_NAME, 259 .queuecommand = fc_queuecommand, 260 .eh_abort_handler = fc_eh_abort, 261 .eh_device_reset_handler = fc_eh_device_reset, 262 .eh_host_reset_handler = fc_eh_host_reset, 263 .slave_alloc = fc_slave_alloc, 264 .change_queue_depth = fc_change_queue_depth, 265 .change_queue_type = fc_change_queue_type, 266 .this_id = -1, 267 .cmd_per_lun = 3, 268 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, 269 .use_clustering = ENABLE_CLUSTERING, 270 .sg_tablesize = SG_ALL, 271 .max_sectors = 0xffff, 272 }; 273 274 /** 275 * fcoe_interface_setup() - Setup a FCoE interface 276 * @fcoe: The new FCoE interface 277 * @netdev: The net device that the fcoe interface is on 278 * 279 * Returns : 0 for success 280 * Locking: must be called with the RTNL mutex held 281 */ 282 static int fcoe_interface_setup(struct fcoe_interface *fcoe, 283 struct net_device *netdev) 284 { 285 struct fcoe_ctlr *fip = &fcoe->ctlr; 286 struct netdev_hw_addr *ha; 287 struct net_device *real_dev; 288 u8 flogi_maddr[ETH_ALEN]; 289 const struct net_device_ops *ops; 290 291 fcoe->netdev = netdev; 292 293 /* Let LLD initialize for FCoE */ 294 ops = netdev->netdev_ops; 295 if (ops->ndo_fcoe_enable) { 296 if (ops->ndo_fcoe_enable(netdev)) 297 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" 298 " specific feature for LLD.\n"); 299 } 300 301 /* Do not support for bonding device */ 302 if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) { 303 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n"); 304 return -EOPNOTSUPP; 305 } 306 307 /* look for SAN MAC address, if multiple SAN MACs exist, only 308 * use the first one for SPMA */ 309 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ? 310 vlan_dev_real_dev(netdev) : netdev; 311 fcoe->realdev = real_dev; 312 rcu_read_lock(); 313 for_each_dev_addr(real_dev, ha) { 314 if ((ha->type == NETDEV_HW_ADDR_T_SAN) && 315 (is_valid_ether_addr(ha->addr))) { 316 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); 317 fip->spma = 1; 318 break; 319 } 320 } 321 rcu_read_unlock(); 322 323 /* setup Source Mac Address */ 324 if (!fip->spma) 325 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); 326 327 /* 328 * Add FCoE MAC address as second unicast MAC address 329 * or enter promiscuous mode if not capable of listening 330 * for multiple unicast MACs. 331 */ 332 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 333 dev_uc_add(netdev, flogi_maddr); 334 if (fip->spma) 335 dev_uc_add(netdev, fip->ctl_src_addr); 336 if (fip->mode == FIP_MODE_VN2VN) { 337 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS); 338 dev_mc_add(netdev, FIP_ALL_P2P_MACS); 339 } else 340 dev_mc_add(netdev, FIP_ALL_ENODE_MACS); 341 342 /* 343 * setup the receive function from ethernet driver 344 * on the ethertype for the given device 345 */ 346 fcoe->fcoe_packet_type.func = fcoe_rcv; 347 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); 348 fcoe->fcoe_packet_type.dev = netdev; 349 dev_add_pack(&fcoe->fcoe_packet_type); 350 351 fcoe->fip_packet_type.func = fcoe_fip_recv; 352 fcoe->fip_packet_type.type = htons(ETH_P_FIP); 353 fcoe->fip_packet_type.dev = netdev; 354 dev_add_pack(&fcoe->fip_packet_type); 355 356 return 0; 357 } 358 359 /** 360 * fcoe_interface_create() - Create a FCoE interface on a net device 361 * @netdev: The net device to create the FCoE interface on 362 * @fip_mode: The mode to use for FIP 363 * 364 * Returns: pointer to a struct fcoe_interface or NULL on error 365 */ 366 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev, 367 enum fip_state fip_mode) 368 { 369 struct fcoe_interface *fcoe; 370 int err; 371 372 if (!try_module_get(THIS_MODULE)) { 373 FCOE_NETDEV_DBG(netdev, 374 "Could not get a reference to the module\n"); 375 fcoe = ERR_PTR(-EBUSY); 376 goto out; 377 } 378 379 fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL); 380 if (!fcoe) { 381 FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n"); 382 fcoe = ERR_PTR(-ENOMEM); 383 goto out_putmod; 384 } 385 386 dev_hold(netdev); 387 388 /* 389 * Initialize FIP. 390 */ 391 fcoe_ctlr_init(&fcoe->ctlr, fip_mode); 392 fcoe->ctlr.send = fcoe_fip_send; 393 fcoe->ctlr.update_mac = fcoe_update_src_mac; 394 fcoe->ctlr.get_src_addr = fcoe_get_src_mac; 395 396 err = fcoe_interface_setup(fcoe, netdev); 397 if (err) { 398 fcoe_ctlr_destroy(&fcoe->ctlr); 399 kfree(fcoe); 400 dev_put(netdev); 401 fcoe = ERR_PTR(err); 402 goto out_putmod; 403 } 404 405 goto out; 406 407 out_putmod: 408 module_put(THIS_MODULE); 409 out: 410 return fcoe; 411 } 412 413 /** 414 * fcoe_interface_remove() - remove FCoE interface from netdev 415 * @fcoe: The FCoE interface to be cleaned up 416 * 417 * Caller must be holding the RTNL mutex 418 */ 419 static void fcoe_interface_remove(struct fcoe_interface *fcoe) 420 { 421 struct net_device *netdev = fcoe->netdev; 422 struct fcoe_ctlr *fip = &fcoe->ctlr; 423 u8 flogi_maddr[ETH_ALEN]; 424 const struct net_device_ops *ops; 425 426 /* 427 * Don't listen for Ethernet packets anymore. 428 * synchronize_net() ensures that the packet handlers are not running 429 * on another CPU. dev_remove_pack() would do that, this calls the 430 * unsyncronized version __dev_remove_pack() to avoid multiple delays. 431 */ 432 __dev_remove_pack(&fcoe->fcoe_packet_type); 433 __dev_remove_pack(&fcoe->fip_packet_type); 434 synchronize_net(); 435 436 /* Delete secondary MAC addresses */ 437 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); 438 dev_uc_del(netdev, flogi_maddr); 439 if (fip->spma) 440 dev_uc_del(netdev, fip->ctl_src_addr); 441 if (fip->mode == FIP_MODE_VN2VN) { 442 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS); 443 dev_mc_del(netdev, FIP_ALL_P2P_MACS); 444 } else 445 dev_mc_del(netdev, FIP_ALL_ENODE_MACS); 446 447 /* Tell the LLD we are done w/ FCoE */ 448 ops = netdev->netdev_ops; 449 if (ops->ndo_fcoe_disable) { 450 if (ops->ndo_fcoe_disable(netdev)) 451 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" 452 " specific feature for LLD.\n"); 453 } 454 fcoe->removed = 1; 455 } 456 457 458 /** 459 * fcoe_interface_cleanup() - Clean up a FCoE interface 460 * @fcoe: The FCoE interface to be cleaned up 461 */ 462 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe) 463 { 464 struct net_device *netdev = fcoe->netdev; 465 struct fcoe_ctlr *fip = &fcoe->ctlr; 466 467 rtnl_lock(); 468 if (!fcoe->removed) 469 fcoe_interface_remove(fcoe); 470 rtnl_unlock(); 471 472 /* Release the self-reference taken during fcoe_interface_create() */ 473 /* tear-down the FCoE controller */ 474 fcoe_ctlr_destroy(fip); 475 scsi_host_put(fcoe->ctlr.lp->host); 476 kfree(fcoe); 477 dev_put(netdev); 478 module_put(THIS_MODULE); 479 } 480 481 /** 482 * fcoe_fip_recv() - Handler for received FIP frames 483 * @skb: The receive skb 484 * @netdev: The associated net device 485 * @ptype: The packet_type structure which was used to register this handler 486 * @orig_dev: The original net_device the the skb was received on. 487 * (in case dev is a bond) 488 * 489 * Returns: 0 for success 490 */ 491 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev, 492 struct packet_type *ptype, 493 struct net_device *orig_dev) 494 { 495 struct fcoe_interface *fcoe; 496 497 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); 498 fcoe_ctlr_recv(&fcoe->ctlr, skb); 499 return 0; 500 } 501 502 /** 503 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame 504 * @port: The FCoE port 505 * @skb: The FIP/FCoE packet to be sent 506 */ 507 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb) 508 { 509 if (port->fcoe_pending_queue.qlen) 510 fcoe_check_wait_queue(port->lport, skb); 511 else if (fcoe_start_io(skb)) 512 fcoe_check_wait_queue(port->lport, skb); 513 } 514 515 /** 516 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame 517 * @fip: The FCoE controller 518 * @skb: The FIP packet to be sent 519 */ 520 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) 521 { 522 skb->dev = fcoe_from_ctlr(fip)->netdev; 523 fcoe_port_send(lport_priv(fip->lp), skb); 524 } 525 526 /** 527 * fcoe_update_src_mac() - Update the Ethernet MAC filters 528 * @lport: The local port to update the source MAC on 529 * @addr: Unicast MAC address to add 530 * 531 * Remove any previously-set unicast MAC filter. 532 * Add secondary FCoE MAC address filter for our OUI. 533 */ 534 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) 535 { 536 struct fcoe_port *port = lport_priv(lport); 537 struct fcoe_interface *fcoe = port->priv; 538 539 if (!is_zero_ether_addr(port->data_src_addr)) 540 dev_uc_del(fcoe->netdev, port->data_src_addr); 541 if (!is_zero_ether_addr(addr)) 542 dev_uc_add(fcoe->netdev, addr); 543 memcpy(port->data_src_addr, addr, ETH_ALEN); 544 } 545 546 /** 547 * fcoe_get_src_mac() - return the Ethernet source address for an lport 548 * @lport: libfc lport 549 */ 550 static u8 *fcoe_get_src_mac(struct fc_lport *lport) 551 { 552 struct fcoe_port *port = lport_priv(lport); 553 554 return port->data_src_addr; 555 } 556 557 /** 558 * fcoe_lport_config() - Set up a local port 559 * @lport: The local port to be setup 560 * 561 * Returns: 0 for success 562 */ 563 static int fcoe_lport_config(struct fc_lport *lport) 564 { 565 lport->link_up = 0; 566 lport->qfull = 0; 567 lport->max_retry_count = 3; 568 lport->max_rport_retry_count = 3; 569 lport->e_d_tov = 2 * 1000; /* FC-FS default */ 570 lport->r_a_tov = 2 * 2 * 1000; 571 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | 572 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); 573 lport->does_npiv = 1; 574 575 fc_lport_init_stats(lport); 576 577 /* lport fc_lport related configuration */ 578 fc_lport_config(lport); 579 580 /* offload related configuration */ 581 lport->crc_offload = 0; 582 lport->seq_offload = 0; 583 lport->lro_enabled = 0; 584 lport->lro_xid = 0; 585 lport->lso_max = 0; 586 587 return 0; 588 } 589 590 /** 591 * fcoe_netdev_features_change - Updates the lport's offload flags based 592 * on the LLD netdev's FCoE feature flags 593 */ 594 static void fcoe_netdev_features_change(struct fc_lport *lport, 595 struct net_device *netdev) 596 { 597 mutex_lock(&lport->lp_mutex); 598 599 if (netdev->features & NETIF_F_SG) 600 lport->sg_supp = 1; 601 else 602 lport->sg_supp = 0; 603 604 if (netdev->features & NETIF_F_FCOE_CRC) { 605 lport->crc_offload = 1; 606 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); 607 } else { 608 lport->crc_offload = 0; 609 } 610 611 if (netdev->features & NETIF_F_FSO) { 612 lport->seq_offload = 1; 613 lport->lso_max = netdev->gso_max_size; 614 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", 615 lport->lso_max); 616 } else { 617 lport->seq_offload = 0; 618 lport->lso_max = 0; 619 } 620 621 if (netdev->fcoe_ddp_xid) { 622 lport->lro_enabled = 1; 623 lport->lro_xid = netdev->fcoe_ddp_xid; 624 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", 625 lport->lro_xid); 626 } else { 627 lport->lro_enabled = 0; 628 lport->lro_xid = 0; 629 } 630 631 mutex_unlock(&lport->lp_mutex); 632 } 633 634 /** 635 * fcoe_netdev_config() - Set up net devive for SW FCoE 636 * @lport: The local port that is associated with the net device 637 * @netdev: The associated net device 638 * 639 * Must be called after fcoe_lport_config() as it will use local port mutex 640 * 641 * Returns: 0 for success 642 */ 643 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev) 644 { 645 u32 mfs; 646 u64 wwnn, wwpn; 647 struct fcoe_interface *fcoe; 648 struct fcoe_port *port; 649 650 /* Setup lport private data to point to fcoe softc */ 651 port = lport_priv(lport); 652 fcoe = port->priv; 653 654 /* 655 * Determine max frame size based on underlying device and optional 656 * user-configured limit. If the MFS is too low, fcoe_link_ok() 657 * will return 0, so do this first. 658 */ 659 mfs = netdev->mtu; 660 if (netdev->features & NETIF_F_FCOE_MTU) { 661 mfs = FCOE_MTU; 662 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); 663 } 664 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); 665 if (fc_set_mfs(lport, mfs)) 666 return -EINVAL; 667 668 /* offload features support */ 669 fcoe_netdev_features_change(lport, netdev); 670 671 skb_queue_head_init(&port->fcoe_pending_queue); 672 port->fcoe_pending_queue_active = 0; 673 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport); 674 675 fcoe_link_speed_update(lport); 676 677 if (!lport->vport) { 678 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN)) 679 wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0); 680 fc_set_wwnn(lport, wwnn); 681 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN)) 682 wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 683 2, 0); 684 fc_set_wwpn(lport, wwpn); 685 } 686 687 return 0; 688 } 689 690 /** 691 * fcoe_shost_config() - Set up the SCSI host associated with a local port 692 * @lport: The local port 693 * @dev: The device associated with the SCSI host 694 * 695 * Must be called after fcoe_lport_config() and fcoe_netdev_config() 696 * 697 * Returns: 0 for success 698 */ 699 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev) 700 { 701 int rc = 0; 702 703 /* lport scsi host config */ 704 lport->host->max_lun = FCOE_MAX_LUN; 705 lport->host->max_id = FCOE_MAX_FCP_TARGET; 706 lport->host->max_channel = 0; 707 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN; 708 709 if (lport->vport) 710 lport->host->transportt = fcoe_vport_scsi_transport; 711 else 712 lport->host->transportt = fcoe_nport_scsi_transport; 713 714 /* add the new host to the SCSI-ml */ 715 rc = scsi_add_host(lport->host, dev); 716 if (rc) { 717 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: " 718 "error on scsi_add_host\n"); 719 return rc; 720 } 721 722 if (!lport->vport) 723 fc_host_max_npiv_vports(lport->host) = USHRT_MAX; 724 725 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 726 "%s v%s over %s", FCOE_NAME, FCOE_VERSION, 727 fcoe_netdev(lport)->name); 728 729 return 0; 730 } 731 732 733 /** 734 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE 735 * @lport: The local port that is associated with the net device 736 * @netdev: The associated net device 737 * 738 * Must be called after fcoe_shost_config() as it will use local port mutex 739 * 740 */ 741 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev) 742 { 743 struct fcoe_interface *fcoe; 744 struct fcoe_port *port; 745 struct net_device *realdev; 746 int rc; 747 struct netdev_fcoe_hbainfo fdmi; 748 749 port = lport_priv(lport); 750 fcoe = port->priv; 751 realdev = fcoe->realdev; 752 753 if (!realdev) 754 return; 755 756 /* No FDMI state m/c for NPIV ports */ 757 if (lport->vport) 758 return; 759 760 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) { 761 memset(&fdmi, 0, sizeof(fdmi)); 762 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev, 763 &fdmi); 764 if (rc) { 765 printk(KERN_INFO "fcoe: Failed to retrieve FDMI " 766 "information from netdev.\n"); 767 return; 768 } 769 770 snprintf(fc_host_serial_number(lport->host), 771 FC_SERIAL_NUMBER_SIZE, 772 "%s", 773 fdmi.serial_number); 774 snprintf(fc_host_manufacturer(lport->host), 775 FC_SERIAL_NUMBER_SIZE, 776 "%s", 777 fdmi.manufacturer); 778 snprintf(fc_host_model(lport->host), 779 FC_SYMBOLIC_NAME_SIZE, 780 "%s", 781 fdmi.model); 782 snprintf(fc_host_model_description(lport->host), 783 FC_SYMBOLIC_NAME_SIZE, 784 "%s", 785 fdmi.model_description); 786 snprintf(fc_host_hardware_version(lport->host), 787 FC_VERSION_STRING_SIZE, 788 "%s", 789 fdmi.hardware_version); 790 snprintf(fc_host_driver_version(lport->host), 791 FC_VERSION_STRING_SIZE, 792 "%s", 793 fdmi.driver_version); 794 snprintf(fc_host_optionrom_version(lport->host), 795 FC_VERSION_STRING_SIZE, 796 "%s", 797 fdmi.optionrom_version); 798 snprintf(fc_host_firmware_version(lport->host), 799 FC_VERSION_STRING_SIZE, 800 "%s", 801 fdmi.firmware_version); 802 803 /* Enable FDMI lport states */ 804 lport->fdmi_enabled = 1; 805 } else { 806 lport->fdmi_enabled = 0; 807 printk(KERN_INFO "fcoe: No FDMI support.\n"); 808 } 809 } 810 811 /** 812 * fcoe_oem_match() - The match routine for the offloaded exchange manager 813 * @fp: The I/O frame 814 * 815 * This routine will be associated with an exchange manager (EM). When 816 * the libfc exchange handling code is looking for an EM to use it will 817 * call this routine and pass it the frame that it wishes to send. This 818 * routine will return True if the associated EM is to be used and False 819 * if the echange code should continue looking for an EM. 820 * 821 * The offload EM that this routine is associated with will handle any 822 * packets that are for SCSI read requests. 823 * 824 * This has been enhanced to work when FCoE stack is operating in target 825 * mode. 826 * 827 * Returns: True for read types I/O, otherwise returns false. 828 */ 829 static bool fcoe_oem_match(struct fc_frame *fp) 830 { 831 struct fc_frame_header *fh = fc_frame_header_get(fp); 832 struct fcp_cmnd *fcp; 833 834 if (fc_fcp_is_read(fr_fsp(fp)) && 835 (fr_fsp(fp)->data_len > fcoe_ddp_min)) 836 return true; 837 else if ((fr_fsp(fp) == NULL) && 838 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) && 839 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { 840 fcp = fc_frame_payload_get(fp, sizeof(*fcp)); 841 if ((fcp->fc_flags & FCP_CFL_WRDATA) && 842 (ntohl(fcp->fc_dl) > fcoe_ddp_min)) 843 return true; 844 } 845 return false; 846 } 847 848 /** 849 * fcoe_em_config() - Allocate and configure an exchange manager 850 * @lport: The local port that the new EM will be associated with 851 * 852 * Returns: 0 on success 853 */ 854 static inline int fcoe_em_config(struct fc_lport *lport) 855 { 856 struct fcoe_port *port = lport_priv(lport); 857 struct fcoe_interface *fcoe = port->priv; 858 struct fcoe_interface *oldfcoe = NULL; 859 struct net_device *old_real_dev, *cur_real_dev; 860 u16 min_xid = FCOE_MIN_XID; 861 u16 max_xid = FCOE_MAX_XID; 862 863 /* 864 * Check if need to allocate an em instance for 865 * offload exchange ids to be shared across all VN_PORTs/lport. 866 */ 867 if (!lport->lro_enabled || !lport->lro_xid || 868 (lport->lro_xid >= max_xid)) { 869 lport->lro_xid = 0; 870 goto skip_oem; 871 } 872 873 /* 874 * Reuse existing offload em instance in case 875 * it is already allocated on real eth device 876 */ 877 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 878 cur_real_dev = vlan_dev_real_dev(fcoe->netdev); 879 else 880 cur_real_dev = fcoe->netdev; 881 882 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { 883 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 884 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); 885 else 886 old_real_dev = oldfcoe->netdev; 887 888 if (cur_real_dev == old_real_dev) { 889 fcoe->oem = oldfcoe->oem; 890 break; 891 } 892 } 893 894 if (fcoe->oem) { 895 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) { 896 printk(KERN_ERR "fcoe_em_config: failed to add " 897 "offload em:%p on interface:%s\n", 898 fcoe->oem, fcoe->netdev->name); 899 return -ENOMEM; 900 } 901 } else { 902 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3, 903 FCOE_MIN_XID, lport->lro_xid, 904 fcoe_oem_match); 905 if (!fcoe->oem) { 906 printk(KERN_ERR "fcoe_em_config: failed to allocate " 907 "em for offload exches on interface:%s\n", 908 fcoe->netdev->name); 909 return -ENOMEM; 910 } 911 } 912 913 /* 914 * Exclude offload EM xid range from next EM xid range. 915 */ 916 min_xid += lport->lro_xid + 1; 917 918 skip_oem: 919 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) { 920 printk(KERN_ERR "fcoe_em_config: failed to " 921 "allocate em on interface %s\n", fcoe->netdev->name); 922 return -ENOMEM; 923 } 924 925 return 0; 926 } 927 928 /** 929 * fcoe_if_destroy() - Tear down a SW FCoE instance 930 * @lport: The local port to be destroyed 931 * 932 */ 933 static void fcoe_if_destroy(struct fc_lport *lport) 934 { 935 struct fcoe_port *port = lport_priv(lport); 936 struct fcoe_interface *fcoe = port->priv; 937 struct net_device *netdev = fcoe->netdev; 938 939 FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); 940 941 /* Logout of the fabric */ 942 fc_fabric_logoff(lport); 943 944 /* Cleanup the fc_lport */ 945 fc_lport_destroy(lport); 946 947 /* Stop the transmit retry timer */ 948 del_timer_sync(&port->timer); 949 950 /* Free existing transmit skbs */ 951 fcoe_clean_pending_queue(lport); 952 953 rtnl_lock(); 954 if (!is_zero_ether_addr(port->data_src_addr)) 955 dev_uc_del(netdev, port->data_src_addr); 956 if (lport->vport) 957 synchronize_net(); 958 else 959 fcoe_interface_remove(fcoe); 960 rtnl_unlock(); 961 962 /* Free queued packets for the per-CPU receive threads */ 963 fcoe_percpu_clean(lport); 964 965 /* Detach from the scsi-ml */ 966 fc_remove_host(lport->host); 967 scsi_remove_host(lport->host); 968 969 /* Destroy lport scsi_priv */ 970 fc_fcp_destroy(lport); 971 972 /* There are no more rports or I/O, free the EM */ 973 fc_exch_mgr_free(lport); 974 975 /* Free memory used by statistical counters */ 976 fc_lport_free_stats(lport); 977 978 /* 979 * Release the Scsi_Host for vport but hold on to 980 * master lport until it fcoe interface fully cleaned-up. 981 */ 982 if (lport->vport) 983 scsi_host_put(lport->host); 984 } 985 986 /** 987 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device 988 * @lport: The local port to setup DDP for 989 * @xid: The exchange ID for this DDP transfer 990 * @sgl: The scatterlist describing this transfer 991 * @sgc: The number of sg items 992 * 993 * Returns: 0 if the DDP context was not configured 994 */ 995 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid, 996 struct scatterlist *sgl, unsigned int sgc) 997 { 998 struct net_device *netdev = fcoe_netdev(lport); 999 1000 if (netdev->netdev_ops->ndo_fcoe_ddp_setup) 1001 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev, 1002 xid, sgl, 1003 sgc); 1004 1005 return 0; 1006 } 1007 1008 /** 1009 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device 1010 * @lport: The local port to setup DDP for 1011 * @xid: The exchange ID for this DDP transfer 1012 * @sgl: The scatterlist describing this transfer 1013 * @sgc: The number of sg items 1014 * 1015 * Returns: 0 if the DDP context was not configured 1016 */ 1017 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid, 1018 struct scatterlist *sgl, unsigned int sgc) 1019 { 1020 struct net_device *netdev = fcoe_netdev(lport); 1021 1022 if (netdev->netdev_ops->ndo_fcoe_ddp_target) 1023 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid, 1024 sgl, sgc); 1025 1026 return 0; 1027 } 1028 1029 1030 /** 1031 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device 1032 * @lport: The local port to complete DDP on 1033 * @xid: The exchange ID for this DDP transfer 1034 * 1035 * Returns: the length of data that have been completed by DDP 1036 */ 1037 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid) 1038 { 1039 struct net_device *netdev = fcoe_netdev(lport); 1040 1041 if (netdev->netdev_ops->ndo_fcoe_ddp_done) 1042 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid); 1043 return 0; 1044 } 1045 1046 /** 1047 * fcoe_if_create() - Create a FCoE instance on an interface 1048 * @fcoe: The FCoE interface to create a local port on 1049 * @parent: The device pointer to be the parent in sysfs for the SCSI host 1050 * @npiv: Indicates if the port is a vport or not 1051 * 1052 * Creates a fc_lport instance and a Scsi_Host instance and configure them. 1053 * 1054 * Returns: The allocated fc_lport or an error pointer 1055 */ 1056 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, 1057 struct device *parent, int npiv) 1058 { 1059 struct net_device *netdev = fcoe->netdev; 1060 struct fc_lport *lport, *n_port; 1061 struct fcoe_port *port; 1062 struct Scsi_Host *shost; 1063 int rc; 1064 /* 1065 * parent is only a vport if npiv is 1, 1066 * but we'll only use vport in that case so go ahead and set it 1067 */ 1068 struct fc_vport *vport = dev_to_vport(parent); 1069 1070 FCOE_NETDEV_DBG(netdev, "Create Interface\n"); 1071 1072 if (!npiv) 1073 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port)); 1074 else 1075 lport = libfc_vport_create(vport, sizeof(*port)); 1076 1077 if (!lport) { 1078 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); 1079 rc = -ENOMEM; 1080 goto out; 1081 } 1082 port = lport_priv(lport); 1083 port->lport = lport; 1084 port->priv = fcoe; 1085 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH; 1086 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH; 1087 INIT_WORK(&port->destroy_work, fcoe_destroy_work); 1088 1089 /* configure a fc_lport including the exchange manager */ 1090 rc = fcoe_lport_config(lport); 1091 if (rc) { 1092 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " 1093 "interface\n"); 1094 goto out_host_put; 1095 } 1096 1097 if (npiv) { 1098 FCOE_NETDEV_DBG(netdev, "Setting vport names, " 1099 "%16.16llx %16.16llx\n", 1100 vport->node_name, vport->port_name); 1101 fc_set_wwnn(lport, vport->node_name); 1102 fc_set_wwpn(lport, vport->port_name); 1103 } 1104 1105 /* configure lport network properties */ 1106 rc = fcoe_netdev_config(lport, netdev); 1107 if (rc) { 1108 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " 1109 "interface\n"); 1110 goto out_lp_destroy; 1111 } 1112 1113 /* configure lport scsi host properties */ 1114 rc = fcoe_shost_config(lport, parent); 1115 if (rc) { 1116 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " 1117 "interface\n"); 1118 goto out_lp_destroy; 1119 } 1120 1121 /* Initialize the library */ 1122 rc = fcoe_libfc_config(lport, &fcoe->ctlr, &fcoe_libfc_fcn_templ, 1); 1123 if (rc) { 1124 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " 1125 "interface\n"); 1126 goto out_lp_destroy; 1127 } 1128 1129 /* Initialized FDMI information */ 1130 fcoe_fdmi_info(lport, netdev); 1131 1132 /* 1133 * fcoe_em_alloc() and fcoe_hostlist_add() both 1134 * need to be atomic with respect to other changes to the 1135 * hostlist since fcoe_em_alloc() looks for an existing EM 1136 * instance on host list updated by fcoe_hostlist_add(). 1137 * 1138 * This is currently handled through the fcoe_config_mutex 1139 * begin held. 1140 */ 1141 if (!npiv) 1142 /* lport exch manager allocation */ 1143 rc = fcoe_em_config(lport); 1144 else { 1145 shost = vport_to_shost(vport); 1146 n_port = shost_priv(shost); 1147 rc = fc_exch_mgr_list_clone(n_port, lport); 1148 } 1149 1150 if (rc) { 1151 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n"); 1152 goto out_lp_destroy; 1153 } 1154 1155 return lport; 1156 1157 out_lp_destroy: 1158 fc_exch_mgr_free(lport); 1159 out_host_put: 1160 scsi_host_put(lport->host); 1161 out: 1162 return ERR_PTR(rc); 1163 } 1164 1165 /** 1166 * fcoe_if_init() - Initialization routine for fcoe.ko 1167 * 1168 * Attaches the SW FCoE transport to the FC transport 1169 * 1170 * Returns: 0 on success 1171 */ 1172 static int __init fcoe_if_init(void) 1173 { 1174 /* attach to scsi transport */ 1175 fcoe_nport_scsi_transport = 1176 fc_attach_transport(&fcoe_nport_fc_functions); 1177 fcoe_vport_scsi_transport = 1178 fc_attach_transport(&fcoe_vport_fc_functions); 1179 1180 if (!fcoe_nport_scsi_transport) { 1181 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); 1182 return -ENODEV; 1183 } 1184 1185 return 0; 1186 } 1187 1188 /** 1189 * fcoe_if_exit() - Tear down fcoe.ko 1190 * 1191 * Detaches the SW FCoE transport from the FC transport 1192 * 1193 * Returns: 0 on success 1194 */ 1195 static int __exit fcoe_if_exit(void) 1196 { 1197 fc_release_transport(fcoe_nport_scsi_transport); 1198 fc_release_transport(fcoe_vport_scsi_transport); 1199 fcoe_nport_scsi_transport = NULL; 1200 fcoe_vport_scsi_transport = NULL; 1201 return 0; 1202 } 1203 1204 /** 1205 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU 1206 * @cpu: The CPU index of the CPU to create a receive thread for 1207 */ 1208 static void fcoe_percpu_thread_create(unsigned int cpu) 1209 { 1210 struct fcoe_percpu_s *p; 1211 struct task_struct *thread; 1212 1213 p = &per_cpu(fcoe_percpu, cpu); 1214 1215 thread = kthread_create_on_node(fcoe_percpu_receive_thread, 1216 (void *)p, cpu_to_node(cpu), 1217 "fcoethread/%d", cpu); 1218 1219 if (likely(!IS_ERR(thread))) { 1220 kthread_bind(thread, cpu); 1221 wake_up_process(thread); 1222 1223 spin_lock_bh(&p->fcoe_rx_list.lock); 1224 p->thread = thread; 1225 spin_unlock_bh(&p->fcoe_rx_list.lock); 1226 } 1227 } 1228 1229 /** 1230 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU 1231 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed 1232 * 1233 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the 1234 * current CPU's Rx thread. If the thread being destroyed is bound to 1235 * the CPU processing this context the skbs will be freed. 1236 */ 1237 static void fcoe_percpu_thread_destroy(unsigned int cpu) 1238 { 1239 struct fcoe_percpu_s *p; 1240 struct task_struct *thread; 1241 struct page *crc_eof; 1242 struct sk_buff *skb; 1243 #ifdef CONFIG_SMP 1244 struct fcoe_percpu_s *p0; 1245 unsigned targ_cpu = get_cpu(); 1246 #endif /* CONFIG_SMP */ 1247 1248 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); 1249 1250 /* Prevent any new skbs from being queued for this CPU. */ 1251 p = &per_cpu(fcoe_percpu, cpu); 1252 spin_lock_bh(&p->fcoe_rx_list.lock); 1253 thread = p->thread; 1254 p->thread = NULL; 1255 crc_eof = p->crc_eof_page; 1256 p->crc_eof_page = NULL; 1257 p->crc_eof_offset = 0; 1258 spin_unlock_bh(&p->fcoe_rx_list.lock); 1259 1260 #ifdef CONFIG_SMP 1261 /* 1262 * Don't bother moving the skb's if this context is running 1263 * on the same CPU that is having its thread destroyed. This 1264 * can easily happen when the module is removed. 1265 */ 1266 if (cpu != targ_cpu) { 1267 p0 = &per_cpu(fcoe_percpu, targ_cpu); 1268 spin_lock_bh(&p0->fcoe_rx_list.lock); 1269 if (p0->thread) { 1270 FCOE_DBG("Moving frames from CPU %d to CPU %d\n", 1271 cpu, targ_cpu); 1272 1273 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1274 __skb_queue_tail(&p0->fcoe_rx_list, skb); 1275 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1276 } else { 1277 /* 1278 * The targeted CPU is not initialized and cannot accept 1279 * new skbs. Unlock the targeted CPU and drop the skbs 1280 * on the CPU that is going offline. 1281 */ 1282 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1283 kfree_skb(skb); 1284 spin_unlock_bh(&p0->fcoe_rx_list.lock); 1285 } 1286 } else { 1287 /* 1288 * This scenario occurs when the module is being removed 1289 * and all threads are being destroyed. skbs will continue 1290 * to be shifted from the CPU thread that is being removed 1291 * to the CPU thread associated with the CPU that is processing 1292 * the module removal. Once there is only one CPU Rx thread it 1293 * will reach this case and we will drop all skbs and later 1294 * stop the thread. 1295 */ 1296 spin_lock_bh(&p->fcoe_rx_list.lock); 1297 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1298 kfree_skb(skb); 1299 spin_unlock_bh(&p->fcoe_rx_list.lock); 1300 } 1301 put_cpu(); 1302 #else 1303 /* 1304 * This a non-SMP scenario where the singular Rx thread is 1305 * being removed. Free all skbs and stop the thread. 1306 */ 1307 spin_lock_bh(&p->fcoe_rx_list.lock); 1308 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) 1309 kfree_skb(skb); 1310 spin_unlock_bh(&p->fcoe_rx_list.lock); 1311 #endif 1312 1313 if (thread) 1314 kthread_stop(thread); 1315 1316 if (crc_eof) 1317 put_page(crc_eof); 1318 } 1319 1320 /** 1321 * fcoe_cpu_callback() - Handler for CPU hotplug events 1322 * @nfb: The callback data block 1323 * @action: The event triggering the callback 1324 * @hcpu: The index of the CPU that the event is for 1325 * 1326 * This creates or destroys per-CPU data for fcoe 1327 * 1328 * Returns NOTIFY_OK always. 1329 */ 1330 static int fcoe_cpu_callback(struct notifier_block *nfb, 1331 unsigned long action, void *hcpu) 1332 { 1333 unsigned cpu = (unsigned long)hcpu; 1334 1335 switch (action) { 1336 case CPU_ONLINE: 1337 case CPU_ONLINE_FROZEN: 1338 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); 1339 fcoe_percpu_thread_create(cpu); 1340 break; 1341 case CPU_DEAD: 1342 case CPU_DEAD_FROZEN: 1343 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); 1344 fcoe_percpu_thread_destroy(cpu); 1345 break; 1346 default: 1347 break; 1348 } 1349 return NOTIFY_OK; 1350 } 1351 1352 /** 1353 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming 1354 * command. 1355 * 1356 * This routine selects next CPU based on cpumask to distribute 1357 * incoming requests in round robin. 1358 * 1359 * Returns: int CPU number 1360 */ 1361 static inline unsigned int fcoe_select_cpu(void) 1362 { 1363 static unsigned int selected_cpu; 1364 1365 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask); 1366 if (selected_cpu >= nr_cpu_ids) 1367 selected_cpu = cpumask_first(cpu_online_mask); 1368 1369 return selected_cpu; 1370 } 1371 1372 /** 1373 * fcoe_rcv() - Receive packets from a net device 1374 * @skb: The received packet 1375 * @netdev: The net device that the packet was received on 1376 * @ptype: The packet type context 1377 * @olddev: The last device net device 1378 * 1379 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a 1380 * FC frame and passes the frame to libfc. 1381 * 1382 * Returns: 0 for success 1383 */ 1384 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev, 1385 struct packet_type *ptype, struct net_device *olddev) 1386 { 1387 struct fc_lport *lport; 1388 struct fcoe_rcv_info *fr; 1389 struct fcoe_interface *fcoe; 1390 struct fc_frame_header *fh; 1391 struct fcoe_percpu_s *fps; 1392 struct ethhdr *eh; 1393 unsigned int cpu; 1394 1395 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); 1396 lport = fcoe->ctlr.lp; 1397 if (unlikely(!lport)) { 1398 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure"); 1399 goto err2; 1400 } 1401 if (!lport->link_up) 1402 goto err2; 1403 1404 FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p " 1405 "data:%p tail:%p end:%p sum:%d dev:%s", 1406 skb->len, skb->data_len, skb->head, skb->data, 1407 skb_tail_pointer(skb), skb_end_pointer(skb), 1408 skb->csum, skb->dev ? skb->dev->name : "<NULL>"); 1409 1410 eh = eth_hdr(skb); 1411 1412 if (is_fip_mode(&fcoe->ctlr) && 1413 compare_ether_addr(eh->h_source, fcoe->ctlr.dest_addr)) { 1414 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n", 1415 eh->h_source); 1416 goto err; 1417 } 1418 1419 /* 1420 * Check for minimum frame length, and make sure required FCoE 1421 * and FC headers are pulled into the linear data area. 1422 */ 1423 if (unlikely((skb->len < FCOE_MIN_FRAME) || 1424 !pskb_may_pull(skb, FCOE_HEADER_LEN))) 1425 goto err; 1426 1427 skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); 1428 fh = (struct fc_frame_header *) skb_transport_header(skb); 1429 1430 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) { 1431 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n", 1432 eh->h_dest); 1433 goto err; 1434 } 1435 1436 fr = fcoe_dev_from_skb(skb); 1437 fr->fr_dev = lport; 1438 1439 /* 1440 * In case the incoming frame's exchange is originated from 1441 * the initiator, then received frame's exchange id is ANDed 1442 * with fc_cpu_mask bits to get the same cpu on which exchange 1443 * was originated, otherwise select cpu using rx exchange id 1444 * or fcoe_select_cpu(). 1445 */ 1446 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) 1447 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; 1448 else { 1449 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN) 1450 cpu = fcoe_select_cpu(); 1451 else 1452 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask; 1453 } 1454 1455 if (cpu >= nr_cpu_ids) 1456 goto err; 1457 1458 fps = &per_cpu(fcoe_percpu, cpu); 1459 spin_lock(&fps->fcoe_rx_list.lock); 1460 if (unlikely(!fps->thread)) { 1461 /* 1462 * The targeted CPU is not ready, let's target 1463 * the first CPU now. For non-SMP systems this 1464 * will check the same CPU twice. 1465 */ 1466 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread " 1467 "ready for incoming skb- using first online " 1468 "CPU.\n"); 1469 1470 spin_unlock(&fps->fcoe_rx_list.lock); 1471 cpu = cpumask_first(cpu_online_mask); 1472 fps = &per_cpu(fcoe_percpu, cpu); 1473 spin_lock(&fps->fcoe_rx_list.lock); 1474 if (!fps->thread) { 1475 spin_unlock(&fps->fcoe_rx_list.lock); 1476 goto err; 1477 } 1478 } 1479 1480 /* 1481 * We now have a valid CPU that we're targeting for 1482 * this skb. We also have this receive thread locked, 1483 * so we're free to queue skbs into it's queue. 1484 */ 1485 1486 /* 1487 * Note: We used to have a set of conditions under which we would 1488 * call fcoe_recv_frame directly, rather than queuing to the rx list 1489 * as it could save a few cycles, but doing so is prohibited, as 1490 * fcoe_recv_frame has several paths that may sleep, which is forbidden 1491 * in softirq context. 1492 */ 1493 __skb_queue_tail(&fps->fcoe_rx_list, skb); 1494 if (fps->thread->state == TASK_INTERRUPTIBLE) 1495 wake_up_process(fps->thread); 1496 spin_unlock(&fps->fcoe_rx_list.lock); 1497 1498 return 0; 1499 err: 1500 per_cpu_ptr(lport->dev_stats, get_cpu())->ErrorFrames++; 1501 put_cpu(); 1502 err2: 1503 kfree_skb(skb); 1504 return -1; 1505 } 1506 1507 /** 1508 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC 1509 * @skb: The packet to be transmitted 1510 * @tlen: The total length of the trailer 1511 * 1512 * Returns: 0 for success 1513 */ 1514 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen) 1515 { 1516 struct fcoe_percpu_s *fps; 1517 int rc; 1518 1519 fps = &get_cpu_var(fcoe_percpu); 1520 rc = fcoe_get_paged_crc_eof(skb, tlen, fps); 1521 put_cpu_var(fcoe_percpu); 1522 1523 return rc; 1524 } 1525 1526 /** 1527 * fcoe_xmit() - Transmit a FCoE frame 1528 * @lport: The local port that the frame is to be transmitted for 1529 * @fp: The frame to be transmitted 1530 * 1531 * Return: 0 for success 1532 */ 1533 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp) 1534 { 1535 int wlen; 1536 u32 crc; 1537 struct ethhdr *eh; 1538 struct fcoe_crc_eof *cp; 1539 struct sk_buff *skb; 1540 struct fcoe_dev_stats *stats; 1541 struct fc_frame_header *fh; 1542 unsigned int hlen; /* header length implies the version */ 1543 unsigned int tlen; /* trailer length */ 1544 unsigned int elen; /* eth header, may include vlan */ 1545 struct fcoe_port *port = lport_priv(lport); 1546 struct fcoe_interface *fcoe = port->priv; 1547 u8 sof, eof; 1548 struct fcoe_hdr *hp; 1549 1550 WARN_ON((fr_len(fp) % sizeof(u32)) != 0); 1551 1552 fh = fc_frame_header_get(fp); 1553 skb = fp_skb(fp); 1554 wlen = skb->len / FCOE_WORD_TO_BYTE; 1555 1556 if (!lport->link_up) { 1557 kfree_skb(skb); 1558 return 0; 1559 } 1560 1561 if (unlikely(fh->fh_type == FC_TYPE_ELS) && 1562 fcoe_ctlr_els_send(&fcoe->ctlr, lport, skb)) 1563 return 0; 1564 1565 sof = fr_sof(fp); 1566 eof = fr_eof(fp); 1567 1568 elen = sizeof(struct ethhdr); 1569 hlen = sizeof(struct fcoe_hdr); 1570 tlen = sizeof(struct fcoe_crc_eof); 1571 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; 1572 1573 /* crc offload */ 1574 if (likely(lport->crc_offload)) { 1575 skb->ip_summed = CHECKSUM_UNNECESSARY; 1576 skb->csum_start = skb_headroom(skb); 1577 skb->csum_offset = skb->len; 1578 crc = 0; 1579 } else { 1580 skb->ip_summed = CHECKSUM_NONE; 1581 crc = fcoe_fc_crc(fp); 1582 } 1583 1584 /* copy port crc and eof to the skb buff */ 1585 if (skb_is_nonlinear(skb)) { 1586 skb_frag_t *frag; 1587 if (fcoe_alloc_paged_crc_eof(skb, tlen)) { 1588 kfree_skb(skb); 1589 return -ENOMEM; 1590 } 1591 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; 1592 cp = kmap_atomic(skb_frag_page(frag)) 1593 + frag->page_offset; 1594 } else { 1595 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); 1596 } 1597 1598 memset(cp, 0, sizeof(*cp)); 1599 cp->fcoe_eof = eof; 1600 cp->fcoe_crc32 = cpu_to_le32(~crc); 1601 1602 if (skb_is_nonlinear(skb)) { 1603 kunmap_atomic(cp); 1604 cp = NULL; 1605 } 1606 1607 /* adjust skb network/transport offsets to match mac/fcoe/port */ 1608 skb_push(skb, elen + hlen); 1609 skb_reset_mac_header(skb); 1610 skb_reset_network_header(skb); 1611 skb->mac_len = elen; 1612 skb->protocol = htons(ETH_P_FCOE); 1613 skb->priority = port->priority; 1614 1615 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN && 1616 fcoe->realdev->features & NETIF_F_HW_VLAN_TX) { 1617 skb->vlan_tci = VLAN_TAG_PRESENT | 1618 vlan_dev_vlan_id(fcoe->netdev); 1619 skb->dev = fcoe->realdev; 1620 } else 1621 skb->dev = fcoe->netdev; 1622 1623 /* fill up mac and fcoe headers */ 1624 eh = eth_hdr(skb); 1625 eh->h_proto = htons(ETH_P_FCOE); 1626 memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN); 1627 if (fcoe->ctlr.map_dest) 1628 memcpy(eh->h_dest + 3, fh->fh_d_id, 3); 1629 1630 if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN)) 1631 memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN); 1632 else 1633 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); 1634 1635 hp = (struct fcoe_hdr *)(eh + 1); 1636 memset(hp, 0, sizeof(*hp)); 1637 if (FC_FCOE_VER) 1638 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); 1639 hp->fcoe_sof = sof; 1640 1641 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ 1642 if (lport->seq_offload && fr_max_payload(fp)) { 1643 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; 1644 skb_shinfo(skb)->gso_size = fr_max_payload(fp); 1645 } else { 1646 skb_shinfo(skb)->gso_type = 0; 1647 skb_shinfo(skb)->gso_size = 0; 1648 } 1649 /* update tx stats: regardless if LLD fails */ 1650 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1651 stats->TxFrames++; 1652 stats->TxWords += wlen; 1653 put_cpu(); 1654 1655 /* send down to lld */ 1656 fr_dev(fp) = lport; 1657 fcoe_port_send(port, skb); 1658 return 0; 1659 } 1660 1661 /** 1662 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion 1663 * @skb: The completed skb (argument required by destructor) 1664 */ 1665 static void fcoe_percpu_flush_done(struct sk_buff *skb) 1666 { 1667 complete(&fcoe_flush_completion); 1668 } 1669 1670 /** 1671 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC 1672 * @lport: The local port the frame was received on 1673 * @fp: The received frame 1674 * 1675 * Return: 0 on passing filtering checks 1676 */ 1677 static inline int fcoe_filter_frames(struct fc_lport *lport, 1678 struct fc_frame *fp) 1679 { 1680 struct fcoe_interface *fcoe; 1681 struct fc_frame_header *fh; 1682 struct sk_buff *skb = (struct sk_buff *)fp; 1683 struct fcoe_dev_stats *stats; 1684 1685 /* 1686 * We only check CRC if no offload is available and if it is 1687 * it's solicited data, in which case, the FCP layer would 1688 * check it during the copy. 1689 */ 1690 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) 1691 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1692 else 1693 fr_flags(fp) |= FCPHF_CRC_UNCHECKED; 1694 1695 fh = (struct fc_frame_header *) skb_transport_header(skb); 1696 fh = fc_frame_header_get(fp); 1697 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP) 1698 return 0; 1699 1700 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv; 1701 if (is_fip_mode(&fcoe->ctlr) && fc_frame_payload_op(fp) == ELS_LOGO && 1702 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) { 1703 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n"); 1704 return -EINVAL; 1705 } 1706 1707 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) || 1708 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) { 1709 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; 1710 return 0; 1711 } 1712 1713 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1714 stats->InvalidCRCCount++; 1715 if (stats->InvalidCRCCount < 5) 1716 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n"); 1717 put_cpu(); 1718 return -EINVAL; 1719 } 1720 1721 /** 1722 * fcoe_recv_frame() - process a single received frame 1723 * @skb: frame to process 1724 */ 1725 static void fcoe_recv_frame(struct sk_buff *skb) 1726 { 1727 u32 fr_len; 1728 struct fc_lport *lport; 1729 struct fcoe_rcv_info *fr; 1730 struct fcoe_dev_stats *stats; 1731 struct fcoe_crc_eof crc_eof; 1732 struct fc_frame *fp; 1733 struct fcoe_port *port; 1734 struct fcoe_hdr *hp; 1735 1736 fr = fcoe_dev_from_skb(skb); 1737 lport = fr->fr_dev; 1738 if (unlikely(!lport)) { 1739 if (skb->destructor != fcoe_percpu_flush_done) 1740 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb"); 1741 kfree_skb(skb); 1742 return; 1743 } 1744 1745 FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " 1746 "head:%p data:%p tail:%p end:%p sum:%d dev:%s", 1747 skb->len, skb->data_len, 1748 skb->head, skb->data, skb_tail_pointer(skb), 1749 skb_end_pointer(skb), skb->csum, 1750 skb->dev ? skb->dev->name : "<NULL>"); 1751 1752 port = lport_priv(lport); 1753 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */ 1754 1755 /* 1756 * Frame length checks and setting up the header pointers 1757 * was done in fcoe_rcv already. 1758 */ 1759 hp = (struct fcoe_hdr *) skb_network_header(skb); 1760 1761 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1762 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { 1763 if (stats->ErrorFrames < 5) 1764 printk(KERN_WARNING "fcoe: FCoE version " 1765 "mismatch: The frame has " 1766 "version %x, but the " 1767 "initiator supports version " 1768 "%x\n", FC_FCOE_DECAPS_VER(hp), 1769 FC_FCOE_VER); 1770 goto drop; 1771 } 1772 1773 skb_pull(skb, sizeof(struct fcoe_hdr)); 1774 fr_len = skb->len - sizeof(struct fcoe_crc_eof); 1775 1776 stats->RxFrames++; 1777 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; 1778 1779 fp = (struct fc_frame *)skb; 1780 fc_frame_init(fp); 1781 fr_dev(fp) = lport; 1782 fr_sof(fp) = hp->fcoe_sof; 1783 1784 /* Copy out the CRC and EOF trailer for access */ 1785 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) 1786 goto drop; 1787 fr_eof(fp) = crc_eof.fcoe_eof; 1788 fr_crc(fp) = crc_eof.fcoe_crc32; 1789 if (pskb_trim(skb, fr_len)) 1790 goto drop; 1791 1792 if (!fcoe_filter_frames(lport, fp)) { 1793 put_cpu(); 1794 fc_exch_recv(lport, fp); 1795 return; 1796 } 1797 drop: 1798 stats->ErrorFrames++; 1799 put_cpu(); 1800 kfree_skb(skb); 1801 } 1802 1803 /** 1804 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread 1805 * @arg: The per-CPU context 1806 * 1807 * Return: 0 for success 1808 */ 1809 static int fcoe_percpu_receive_thread(void *arg) 1810 { 1811 struct fcoe_percpu_s *p = arg; 1812 struct sk_buff *skb; 1813 struct sk_buff_head tmp; 1814 1815 skb_queue_head_init(&tmp); 1816 1817 set_user_nice(current, -20); 1818 1819 while (!kthread_should_stop()) { 1820 1821 spin_lock_bh(&p->fcoe_rx_list.lock); 1822 skb_queue_splice_init(&p->fcoe_rx_list, &tmp); 1823 spin_unlock_bh(&p->fcoe_rx_list.lock); 1824 1825 while ((skb = __skb_dequeue(&tmp)) != NULL) 1826 fcoe_recv_frame(skb); 1827 1828 spin_lock_bh(&p->fcoe_rx_list.lock); 1829 if (!skb_queue_len(&p->fcoe_rx_list)) { 1830 set_current_state(TASK_INTERRUPTIBLE); 1831 spin_unlock_bh(&p->fcoe_rx_list.lock); 1832 schedule(); 1833 set_current_state(TASK_RUNNING); 1834 } else 1835 spin_unlock_bh(&p->fcoe_rx_list.lock); 1836 } 1837 return 0; 1838 } 1839 1840 /** 1841 * fcoe_dev_setup() - Setup the link change notification interface 1842 */ 1843 static void fcoe_dev_setup(void) 1844 { 1845 register_dcbevent_notifier(&dcb_notifier); 1846 register_netdevice_notifier(&fcoe_notifier); 1847 } 1848 1849 /** 1850 * fcoe_dev_cleanup() - Cleanup the link change notification interface 1851 */ 1852 static void fcoe_dev_cleanup(void) 1853 { 1854 unregister_dcbevent_notifier(&dcb_notifier); 1855 unregister_netdevice_notifier(&fcoe_notifier); 1856 } 1857 1858 static struct fcoe_interface * 1859 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev) 1860 { 1861 struct fcoe_interface *fcoe; 1862 struct net_device *real_dev; 1863 1864 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1865 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) 1866 real_dev = vlan_dev_real_dev(fcoe->netdev); 1867 else 1868 real_dev = fcoe->netdev; 1869 1870 if (netdev == real_dev) 1871 return fcoe; 1872 } 1873 return NULL; 1874 } 1875 1876 static int fcoe_dcb_app_notification(struct notifier_block *notifier, 1877 ulong event, void *ptr) 1878 { 1879 struct dcb_app_type *entry = ptr; 1880 struct fcoe_interface *fcoe; 1881 struct net_device *netdev; 1882 struct fcoe_port *port; 1883 int prio; 1884 1885 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE) 1886 return NOTIFY_OK; 1887 1888 netdev = dev_get_by_index(&init_net, entry->ifindex); 1889 if (!netdev) 1890 return NOTIFY_OK; 1891 1892 fcoe = fcoe_hostlist_lookup_realdev_port(netdev); 1893 dev_put(netdev); 1894 if (!fcoe) 1895 return NOTIFY_OK; 1896 1897 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE) 1898 prio = ffs(entry->app.priority) - 1; 1899 else 1900 prio = entry->app.priority; 1901 1902 if (prio < 0) 1903 return NOTIFY_OK; 1904 1905 if (entry->app.protocol == ETH_P_FIP || 1906 entry->app.protocol == ETH_P_FCOE) 1907 fcoe->ctlr.priority = prio; 1908 1909 if (entry->app.protocol == ETH_P_FCOE) { 1910 port = lport_priv(fcoe->ctlr.lp); 1911 port->priority = prio; 1912 } 1913 1914 return NOTIFY_OK; 1915 } 1916 1917 /** 1918 * fcoe_device_notification() - Handler for net device events 1919 * @notifier: The context of the notification 1920 * @event: The type of event 1921 * @ptr: The net device that the event was on 1922 * 1923 * This function is called by the Ethernet driver in case of link change event. 1924 * 1925 * Returns: 0 for success 1926 */ 1927 static int fcoe_device_notification(struct notifier_block *notifier, 1928 ulong event, void *ptr) 1929 { 1930 struct fc_lport *lport = NULL; 1931 struct net_device *netdev = ptr; 1932 struct fcoe_interface *fcoe; 1933 struct fcoe_port *port; 1934 struct fcoe_dev_stats *stats; 1935 u32 link_possible = 1; 1936 u32 mfs; 1937 int rc = NOTIFY_OK; 1938 1939 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 1940 if (fcoe->netdev == netdev) { 1941 lport = fcoe->ctlr.lp; 1942 break; 1943 } 1944 } 1945 if (!lport) { 1946 rc = NOTIFY_DONE; 1947 goto out; 1948 } 1949 1950 switch (event) { 1951 case NETDEV_DOWN: 1952 case NETDEV_GOING_DOWN: 1953 link_possible = 0; 1954 break; 1955 case NETDEV_UP: 1956 case NETDEV_CHANGE: 1957 break; 1958 case NETDEV_CHANGEMTU: 1959 if (netdev->features & NETIF_F_FCOE_MTU) 1960 break; 1961 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + 1962 sizeof(struct fcoe_crc_eof)); 1963 if (mfs >= FC_MIN_MAX_FRAME) 1964 fc_set_mfs(lport, mfs); 1965 break; 1966 case NETDEV_REGISTER: 1967 break; 1968 case NETDEV_UNREGISTER: 1969 list_del(&fcoe->list); 1970 port = lport_priv(fcoe->ctlr.lp); 1971 queue_work(fcoe_wq, &port->destroy_work); 1972 goto out; 1973 break; 1974 case NETDEV_FEAT_CHANGE: 1975 fcoe_netdev_features_change(lport, netdev); 1976 break; 1977 default: 1978 FCOE_NETDEV_DBG(netdev, "Unknown event %ld " 1979 "from netdev netlink\n", event); 1980 } 1981 1982 fcoe_link_speed_update(lport); 1983 1984 if (link_possible && !fcoe_link_ok(lport)) 1985 fcoe_ctlr_link_up(&fcoe->ctlr); 1986 else if (fcoe_ctlr_link_down(&fcoe->ctlr)) { 1987 stats = per_cpu_ptr(lport->dev_stats, get_cpu()); 1988 stats->LinkFailureCount++; 1989 put_cpu(); 1990 fcoe_clean_pending_queue(lport); 1991 } 1992 out: 1993 return rc; 1994 } 1995 1996 /** 1997 * fcoe_disable() - Disables a FCoE interface 1998 * @netdev : The net_device object the Ethernet interface to create on 1999 * 2000 * Called from fcoe transport. 2001 * 2002 * Returns: 0 for success 2003 */ 2004 static int fcoe_disable(struct net_device *netdev) 2005 { 2006 struct fcoe_interface *fcoe; 2007 int rc = 0; 2008 2009 mutex_lock(&fcoe_config_mutex); 2010 2011 rtnl_lock(); 2012 fcoe = fcoe_hostlist_lookup_port(netdev); 2013 rtnl_unlock(); 2014 2015 if (fcoe) { 2016 fcoe_ctlr_link_down(&fcoe->ctlr); 2017 fcoe_clean_pending_queue(fcoe->ctlr.lp); 2018 } else 2019 rc = -ENODEV; 2020 2021 mutex_unlock(&fcoe_config_mutex); 2022 return rc; 2023 } 2024 2025 /** 2026 * fcoe_enable() - Enables a FCoE interface 2027 * @netdev : The net_device object the Ethernet interface to create on 2028 * 2029 * Called from fcoe transport. 2030 * 2031 * Returns: 0 for success 2032 */ 2033 static int fcoe_enable(struct net_device *netdev) 2034 { 2035 struct fcoe_interface *fcoe; 2036 int rc = 0; 2037 2038 mutex_lock(&fcoe_config_mutex); 2039 rtnl_lock(); 2040 fcoe = fcoe_hostlist_lookup_port(netdev); 2041 rtnl_unlock(); 2042 2043 if (!fcoe) 2044 rc = -ENODEV; 2045 else if (!fcoe_link_ok(fcoe->ctlr.lp)) 2046 fcoe_ctlr_link_up(&fcoe->ctlr); 2047 2048 mutex_unlock(&fcoe_config_mutex); 2049 return rc; 2050 } 2051 2052 /** 2053 * fcoe_destroy() - Destroy a FCoE interface 2054 * @netdev : The net_device object the Ethernet interface to create on 2055 * 2056 * Called from fcoe transport 2057 * 2058 * Returns: 0 for success 2059 */ 2060 static int fcoe_destroy(struct net_device *netdev) 2061 { 2062 struct fcoe_interface *fcoe; 2063 struct fc_lport *lport; 2064 struct fcoe_port *port; 2065 int rc = 0; 2066 2067 mutex_lock(&fcoe_config_mutex); 2068 rtnl_lock(); 2069 fcoe = fcoe_hostlist_lookup_port(netdev); 2070 if (!fcoe) { 2071 rc = -ENODEV; 2072 goto out_nodev; 2073 } 2074 lport = fcoe->ctlr.lp; 2075 port = lport_priv(lport); 2076 list_del(&fcoe->list); 2077 queue_work(fcoe_wq, &port->destroy_work); 2078 out_nodev: 2079 rtnl_unlock(); 2080 mutex_unlock(&fcoe_config_mutex); 2081 return rc; 2082 } 2083 2084 /** 2085 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context 2086 * @work: Handle to the FCoE port to be destroyed 2087 */ 2088 static void fcoe_destroy_work(struct work_struct *work) 2089 { 2090 struct fcoe_port *port; 2091 struct fcoe_interface *fcoe; 2092 2093 port = container_of(work, struct fcoe_port, destroy_work); 2094 mutex_lock(&fcoe_config_mutex); 2095 2096 fcoe = port->priv; 2097 fcoe_if_destroy(port->lport); 2098 fcoe_interface_cleanup(fcoe); 2099 2100 mutex_unlock(&fcoe_config_mutex); 2101 } 2102 2103 /** 2104 * fcoe_match() - Check if the FCoE is supported on the given netdevice 2105 * @netdev : The net_device object the Ethernet interface to create on 2106 * 2107 * Called from fcoe transport. 2108 * 2109 * Returns: always returns true as this is the default FCoE transport, 2110 * i.e., support all netdevs. 2111 */ 2112 static bool fcoe_match(struct net_device *netdev) 2113 { 2114 return true; 2115 } 2116 2117 /** 2118 * fcoe_dcb_create() - Initialize DCB attributes and hooks 2119 * @netdev: The net_device object of the L2 link that should be queried 2120 * @port: The fcoe_port to bind FCoE APP priority with 2121 * @ 2122 */ 2123 static void fcoe_dcb_create(struct fcoe_interface *fcoe) 2124 { 2125 #ifdef CONFIG_DCB 2126 int dcbx; 2127 u8 fup, up; 2128 struct net_device *netdev = fcoe->realdev; 2129 struct fcoe_port *port = lport_priv(fcoe->ctlr.lp); 2130 struct dcb_app app = { 2131 .priority = 0, 2132 .protocol = ETH_P_FCOE 2133 }; 2134 2135 /* setup DCB priority attributes. */ 2136 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) { 2137 dcbx = netdev->dcbnl_ops->getdcbx(netdev); 2138 2139 if (dcbx & DCB_CAP_DCBX_VER_IEEE) { 2140 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE; 2141 up = dcb_ieee_getapp_mask(netdev, &app); 2142 app.protocol = ETH_P_FIP; 2143 fup = dcb_ieee_getapp_mask(netdev, &app); 2144 } else { 2145 app.selector = DCB_APP_IDTYPE_ETHTYPE; 2146 up = dcb_getapp(netdev, &app); 2147 app.protocol = ETH_P_FIP; 2148 fup = dcb_getapp(netdev, &app); 2149 } 2150 2151 port->priority = ffs(up) ? ffs(up) - 1 : 0; 2152 fcoe->ctlr.priority = ffs(fup) ? ffs(fup) - 1 : port->priority; 2153 } 2154 #endif 2155 } 2156 2157 /** 2158 * fcoe_create() - Create a fcoe interface 2159 * @netdev : The net_device object the Ethernet interface to create on 2160 * @fip_mode: The FIP mode for this creation 2161 * 2162 * Called from fcoe transport 2163 * 2164 * Returns: 0 for success 2165 */ 2166 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode) 2167 { 2168 int rc = 0; 2169 struct fcoe_interface *fcoe; 2170 struct fc_lport *lport; 2171 2172 mutex_lock(&fcoe_config_mutex); 2173 rtnl_lock(); 2174 2175 /* look for existing lport */ 2176 if (fcoe_hostlist_lookup(netdev)) { 2177 rc = -EEXIST; 2178 goto out_nodev; 2179 } 2180 2181 fcoe = fcoe_interface_create(netdev, fip_mode); 2182 if (IS_ERR(fcoe)) { 2183 rc = PTR_ERR(fcoe); 2184 goto out_nodev; 2185 } 2186 2187 lport = fcoe_if_create(fcoe, &netdev->dev, 0); 2188 if (IS_ERR(lport)) { 2189 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", 2190 netdev->name); 2191 rc = -EIO; 2192 rtnl_unlock(); 2193 fcoe_interface_cleanup(fcoe); 2194 goto out_nortnl; 2195 } 2196 2197 /* Make this the "master" N_Port */ 2198 fcoe->ctlr.lp = lport; 2199 2200 /* setup DCB priority attributes. */ 2201 fcoe_dcb_create(fcoe); 2202 2203 /* add to lports list */ 2204 fcoe_hostlist_add(lport); 2205 2206 /* start FIP Discovery and FLOGI */ 2207 lport->boot_time = jiffies; 2208 fc_fabric_login(lport); 2209 if (!fcoe_link_ok(lport)) { 2210 rtnl_unlock(); 2211 fcoe_ctlr_link_up(&fcoe->ctlr); 2212 mutex_unlock(&fcoe_config_mutex); 2213 return rc; 2214 } 2215 2216 out_nodev: 2217 rtnl_unlock(); 2218 out_nortnl: 2219 mutex_unlock(&fcoe_config_mutex); 2220 return rc; 2221 } 2222 2223 /** 2224 * fcoe_link_speed_update() - Update the supported and actual link speeds 2225 * @lport: The local port to update speeds for 2226 * 2227 * Returns: 0 if the ethtool query was successful 2228 * -1 if the ethtool query failed 2229 */ 2230 static int fcoe_link_speed_update(struct fc_lport *lport) 2231 { 2232 struct net_device *netdev = fcoe_netdev(lport); 2233 struct ethtool_cmd ecmd; 2234 2235 if (!__ethtool_get_settings(netdev, &ecmd)) { 2236 lport->link_supported_speeds &= 2237 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); 2238 if (ecmd.supported & (SUPPORTED_1000baseT_Half | 2239 SUPPORTED_1000baseT_Full)) 2240 lport->link_supported_speeds |= FC_PORTSPEED_1GBIT; 2241 if (ecmd.supported & SUPPORTED_10000baseT_Full) 2242 lport->link_supported_speeds |= 2243 FC_PORTSPEED_10GBIT; 2244 switch (ethtool_cmd_speed(&ecmd)) { 2245 case SPEED_1000: 2246 lport->link_speed = FC_PORTSPEED_1GBIT; 2247 break; 2248 case SPEED_10000: 2249 lport->link_speed = FC_PORTSPEED_10GBIT; 2250 break; 2251 } 2252 return 0; 2253 } 2254 return -1; 2255 } 2256 2257 /** 2258 * fcoe_link_ok() - Check if the link is OK for a local port 2259 * @lport: The local port to check link on 2260 * 2261 * Returns: 0 if link is UP and OK, -1 if not 2262 * 2263 */ 2264 static int fcoe_link_ok(struct fc_lport *lport) 2265 { 2266 struct net_device *netdev = fcoe_netdev(lport); 2267 2268 if (netif_oper_up(netdev)) 2269 return 0; 2270 return -1; 2271 } 2272 2273 /** 2274 * fcoe_percpu_clean() - Clear all pending skbs for an local port 2275 * @lport: The local port whose skbs are to be cleared 2276 * 2277 * Must be called with fcoe_create_mutex held to single-thread completion. 2278 * 2279 * This flushes the pending skbs by adding a new skb to each queue and 2280 * waiting until they are all freed. This assures us that not only are 2281 * there no packets that will be handled by the lport, but also that any 2282 * threads already handling packet have returned. 2283 */ 2284 static void fcoe_percpu_clean(struct fc_lport *lport) 2285 { 2286 struct fcoe_percpu_s *pp; 2287 struct sk_buff *skb; 2288 unsigned int cpu; 2289 2290 for_each_possible_cpu(cpu) { 2291 pp = &per_cpu(fcoe_percpu, cpu); 2292 2293 if (!pp->thread || !cpu_online(cpu)) 2294 continue; 2295 2296 skb = dev_alloc_skb(0); 2297 if (!skb) 2298 continue; 2299 2300 skb->destructor = fcoe_percpu_flush_done; 2301 2302 spin_lock_bh(&pp->fcoe_rx_list.lock); 2303 __skb_queue_tail(&pp->fcoe_rx_list, skb); 2304 if (pp->fcoe_rx_list.qlen == 1) 2305 wake_up_process(pp->thread); 2306 spin_unlock_bh(&pp->fcoe_rx_list.lock); 2307 2308 wait_for_completion(&fcoe_flush_completion); 2309 } 2310 } 2311 2312 /** 2313 * fcoe_reset() - Reset a local port 2314 * @shost: The SCSI host associated with the local port to be reset 2315 * 2316 * Returns: Always 0 (return value required by FC transport template) 2317 */ 2318 static int fcoe_reset(struct Scsi_Host *shost) 2319 { 2320 struct fc_lport *lport = shost_priv(shost); 2321 struct fcoe_port *port = lport_priv(lport); 2322 struct fcoe_interface *fcoe = port->priv; 2323 2324 fcoe_ctlr_link_down(&fcoe->ctlr); 2325 fcoe_clean_pending_queue(fcoe->ctlr.lp); 2326 if (!fcoe_link_ok(fcoe->ctlr.lp)) 2327 fcoe_ctlr_link_up(&fcoe->ctlr); 2328 return 0; 2329 } 2330 2331 /** 2332 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device 2333 * @netdev: The net device used as a key 2334 * 2335 * Locking: Must be called with the RNL mutex held. 2336 * 2337 * Returns: NULL or the FCoE interface 2338 */ 2339 static struct fcoe_interface * 2340 fcoe_hostlist_lookup_port(const struct net_device *netdev) 2341 { 2342 struct fcoe_interface *fcoe; 2343 2344 list_for_each_entry(fcoe, &fcoe_hostlist, list) { 2345 if (fcoe->netdev == netdev) 2346 return fcoe; 2347 } 2348 return NULL; 2349 } 2350 2351 /** 2352 * fcoe_hostlist_lookup() - Find the local port associated with a 2353 * given net device 2354 * @netdev: The netdevice used as a key 2355 * 2356 * Locking: Must be called with the RTNL mutex held 2357 * 2358 * Returns: NULL or the local port 2359 */ 2360 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) 2361 { 2362 struct fcoe_interface *fcoe; 2363 2364 fcoe = fcoe_hostlist_lookup_port(netdev); 2365 return (fcoe) ? fcoe->ctlr.lp : NULL; 2366 } 2367 2368 /** 2369 * fcoe_hostlist_add() - Add the FCoE interface identified by a local 2370 * port to the hostlist 2371 * @lport: The local port that identifies the FCoE interface to be added 2372 * 2373 * Locking: must be called with the RTNL mutex held 2374 * 2375 * Returns: 0 for success 2376 */ 2377 static int fcoe_hostlist_add(const struct fc_lport *lport) 2378 { 2379 struct fcoe_interface *fcoe; 2380 struct fcoe_port *port; 2381 2382 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); 2383 if (!fcoe) { 2384 port = lport_priv(lport); 2385 fcoe = port->priv; 2386 list_add_tail(&fcoe->list, &fcoe_hostlist); 2387 } 2388 return 0; 2389 } 2390 2391 2392 static struct fcoe_transport fcoe_sw_transport = { 2393 .name = {FCOE_TRANSPORT_DEFAULT}, 2394 .attached = false, 2395 .list = LIST_HEAD_INIT(fcoe_sw_transport.list), 2396 .match = fcoe_match, 2397 .create = fcoe_create, 2398 .destroy = fcoe_destroy, 2399 .enable = fcoe_enable, 2400 .disable = fcoe_disable, 2401 }; 2402 2403 /** 2404 * fcoe_init() - Initialize fcoe.ko 2405 * 2406 * Returns: 0 on success, or a negative value on failure 2407 */ 2408 static int __init fcoe_init(void) 2409 { 2410 struct fcoe_percpu_s *p; 2411 unsigned int cpu; 2412 int rc = 0; 2413 2414 fcoe_wq = alloc_workqueue("fcoe", 0, 0); 2415 if (!fcoe_wq) 2416 return -ENOMEM; 2417 2418 /* register as a fcoe transport */ 2419 rc = fcoe_transport_attach(&fcoe_sw_transport); 2420 if (rc) { 2421 printk(KERN_ERR "failed to register an fcoe transport, check " 2422 "if libfcoe is loaded\n"); 2423 return rc; 2424 } 2425 2426 mutex_lock(&fcoe_config_mutex); 2427 2428 for_each_possible_cpu(cpu) { 2429 p = &per_cpu(fcoe_percpu, cpu); 2430 skb_queue_head_init(&p->fcoe_rx_list); 2431 } 2432 2433 for_each_online_cpu(cpu) 2434 fcoe_percpu_thread_create(cpu); 2435 2436 /* Initialize per CPU interrupt thread */ 2437 rc = register_hotcpu_notifier(&fcoe_cpu_notifier); 2438 if (rc) 2439 goto out_free; 2440 2441 /* Setup link change notification */ 2442 fcoe_dev_setup(); 2443 2444 rc = fcoe_if_init(); 2445 if (rc) 2446 goto out_free; 2447 2448 mutex_unlock(&fcoe_config_mutex); 2449 return 0; 2450 2451 out_free: 2452 for_each_online_cpu(cpu) { 2453 fcoe_percpu_thread_destroy(cpu); 2454 } 2455 mutex_unlock(&fcoe_config_mutex); 2456 destroy_workqueue(fcoe_wq); 2457 return rc; 2458 } 2459 module_init(fcoe_init); 2460 2461 /** 2462 * fcoe_exit() - Clean up fcoe.ko 2463 * 2464 * Returns: 0 on success or a negative value on failure 2465 */ 2466 static void __exit fcoe_exit(void) 2467 { 2468 struct fcoe_interface *fcoe, *tmp; 2469 struct fcoe_port *port; 2470 unsigned int cpu; 2471 2472 mutex_lock(&fcoe_config_mutex); 2473 2474 fcoe_dev_cleanup(); 2475 2476 /* releases the associated fcoe hosts */ 2477 rtnl_lock(); 2478 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) { 2479 list_del(&fcoe->list); 2480 port = lport_priv(fcoe->ctlr.lp); 2481 queue_work(fcoe_wq, &port->destroy_work); 2482 } 2483 rtnl_unlock(); 2484 2485 unregister_hotcpu_notifier(&fcoe_cpu_notifier); 2486 2487 for_each_online_cpu(cpu) 2488 fcoe_percpu_thread_destroy(cpu); 2489 2490 mutex_unlock(&fcoe_config_mutex); 2491 2492 /* 2493 * destroy_work's may be chained but destroy_workqueue() 2494 * can take care of them. Just kill the fcoe_wq. 2495 */ 2496 destroy_workqueue(fcoe_wq); 2497 2498 /* 2499 * Detaching from the scsi transport must happen after all 2500 * destroys are done on the fcoe_wq. destroy_workqueue will 2501 * enusre the fcoe_wq is flushed. 2502 */ 2503 fcoe_if_exit(); 2504 2505 /* detach from fcoe transport */ 2506 fcoe_transport_detach(&fcoe_sw_transport); 2507 } 2508 module_exit(fcoe_exit); 2509 2510 /** 2511 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler 2512 * @seq: active sequence in the FLOGI or FDISC exchange 2513 * @fp: response frame, or error encoded in a pointer (timeout) 2514 * @arg: pointer the the fcoe_ctlr structure 2515 * 2516 * This handles MAC address management for FCoE, then passes control on to 2517 * the libfc FLOGI response handler. 2518 */ 2519 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2520 { 2521 struct fcoe_ctlr *fip = arg; 2522 struct fc_exch *exch = fc_seq_exch(seq); 2523 struct fc_lport *lport = exch->lp; 2524 u8 *mac; 2525 2526 if (IS_ERR(fp)) 2527 goto done; 2528 2529 mac = fr_cb(fp)->granted_mac; 2530 /* pre-FIP */ 2531 if (is_zero_ether_addr(mac)) 2532 fcoe_ctlr_recv_flogi(fip, lport, fp); 2533 if (!is_zero_ether_addr(mac)) 2534 fcoe_update_src_mac(lport, mac); 2535 done: 2536 fc_lport_flogi_resp(seq, fp, lport); 2537 } 2538 2539 /** 2540 * fcoe_logo_resp() - FCoE specific LOGO response handler 2541 * @seq: active sequence in the LOGO exchange 2542 * @fp: response frame, or error encoded in a pointer (timeout) 2543 * @arg: pointer the the fcoe_ctlr structure 2544 * 2545 * This handles MAC address management for FCoE, then passes control on to 2546 * the libfc LOGO response handler. 2547 */ 2548 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 2549 { 2550 struct fc_lport *lport = arg; 2551 static u8 zero_mac[ETH_ALEN] = { 0 }; 2552 2553 if (!IS_ERR(fp)) 2554 fcoe_update_src_mac(lport, zero_mac); 2555 fc_lport_logo_resp(seq, fp, lport); 2556 } 2557 2558 /** 2559 * fcoe_elsct_send - FCoE specific ELS handler 2560 * 2561 * This does special case handling of FIP encapsualted ELS exchanges for FCoE, 2562 * using FCoE specific response handlers and passing the FIP controller as 2563 * the argument (the lport is still available from the exchange). 2564 * 2565 * Most of the work here is just handed off to the libfc routine. 2566 */ 2567 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did, 2568 struct fc_frame *fp, unsigned int op, 2569 void (*resp)(struct fc_seq *, 2570 struct fc_frame *, 2571 void *), 2572 void *arg, u32 timeout) 2573 { 2574 struct fcoe_port *port = lport_priv(lport); 2575 struct fcoe_interface *fcoe = port->priv; 2576 struct fcoe_ctlr *fip = &fcoe->ctlr; 2577 struct fc_frame_header *fh = fc_frame_header_get(fp); 2578 2579 switch (op) { 2580 case ELS_FLOGI: 2581 case ELS_FDISC: 2582 if (lport->point_to_multipoint) 2583 break; 2584 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, 2585 fip, timeout); 2586 case ELS_LOGO: 2587 /* only hook onto fabric logouts, not port logouts */ 2588 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) 2589 break; 2590 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, 2591 lport, timeout); 2592 } 2593 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); 2594 } 2595 2596 /** 2597 * fcoe_vport_create() - create an fc_host/scsi_host for a vport 2598 * @vport: fc_vport object to create a new fc_host for 2599 * @disabled: start the new fc_host in a disabled state by default? 2600 * 2601 * Returns: 0 for success 2602 */ 2603 static int fcoe_vport_create(struct fc_vport *vport, bool disabled) 2604 { 2605 struct Scsi_Host *shost = vport_to_shost(vport); 2606 struct fc_lport *n_port = shost_priv(shost); 2607 struct fcoe_port *port = lport_priv(n_port); 2608 struct fcoe_interface *fcoe = port->priv; 2609 struct net_device *netdev = fcoe->netdev; 2610 struct fc_lport *vn_port; 2611 int rc; 2612 char buf[32]; 2613 2614 rc = fcoe_validate_vport_create(vport); 2615 if (rc) { 2616 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf)); 2617 printk(KERN_ERR "fcoe: Failed to create vport, " 2618 "WWPN (0x%s) already exists\n", 2619 buf); 2620 return rc; 2621 } 2622 2623 mutex_lock(&fcoe_config_mutex); 2624 rtnl_lock(); 2625 vn_port = fcoe_if_create(fcoe, &vport->dev, 1); 2626 rtnl_unlock(); 2627 mutex_unlock(&fcoe_config_mutex); 2628 2629 if (IS_ERR(vn_port)) { 2630 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n", 2631 netdev->name); 2632 return -EIO; 2633 } 2634 2635 if (disabled) { 2636 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2637 } else { 2638 vn_port->boot_time = jiffies; 2639 fc_fabric_login(vn_port); 2640 fc_vport_setlink(vn_port); 2641 } 2642 return 0; 2643 } 2644 2645 /** 2646 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport 2647 * @vport: fc_vport object that is being destroyed 2648 * 2649 * Returns: 0 for success 2650 */ 2651 static int fcoe_vport_destroy(struct fc_vport *vport) 2652 { 2653 struct Scsi_Host *shost = vport_to_shost(vport); 2654 struct fc_lport *n_port = shost_priv(shost); 2655 struct fc_lport *vn_port = vport->dd_data; 2656 2657 mutex_lock(&n_port->lp_mutex); 2658 list_del(&vn_port->list); 2659 mutex_unlock(&n_port->lp_mutex); 2660 2661 mutex_lock(&fcoe_config_mutex); 2662 fcoe_if_destroy(vn_port); 2663 mutex_unlock(&fcoe_config_mutex); 2664 2665 return 0; 2666 } 2667 2668 /** 2669 * fcoe_vport_disable() - change vport state 2670 * @vport: vport to bring online/offline 2671 * @disable: should the vport be disabled? 2672 */ 2673 static int fcoe_vport_disable(struct fc_vport *vport, bool disable) 2674 { 2675 struct fc_lport *lport = vport->dd_data; 2676 2677 if (disable) { 2678 fc_vport_set_state(vport, FC_VPORT_DISABLED); 2679 fc_fabric_logoff(lport); 2680 } else { 2681 lport->boot_time = jiffies; 2682 fc_fabric_login(lport); 2683 fc_vport_setlink(lport); 2684 } 2685 2686 return 0; 2687 } 2688 2689 /** 2690 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name 2691 * @vport: fc_vport with a new symbolic name string 2692 * 2693 * After generating a new symbolic name string, a new RSPN_ID request is 2694 * sent to the name server. There is no response handler, so if it fails 2695 * for some reason it will not be retried. 2696 */ 2697 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport) 2698 { 2699 struct fc_lport *lport = vport->dd_data; 2700 struct fc_frame *fp; 2701 size_t len; 2702 2703 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE, 2704 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION, 2705 fcoe_netdev(lport)->name, vport->symbolic_name); 2706 2707 if (lport->state != LPORT_ST_READY) 2708 return; 2709 2710 len = strnlen(fc_host_symbolic_name(lport->host), 255); 2711 fp = fc_frame_alloc(lport, 2712 sizeof(struct fc_ct_hdr) + 2713 sizeof(struct fc_ns_rspn) + len); 2714 if (!fp) 2715 return; 2716 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID, 2717 NULL, NULL, 3 * lport->r_a_tov); 2718 } 2719 2720 /** 2721 * fcoe_get_lesb() - Fill the FCoE Link Error Status Block 2722 * @lport: the local port 2723 * @fc_lesb: the link error status block 2724 */ 2725 static void fcoe_get_lesb(struct fc_lport *lport, 2726 struct fc_els_lesb *fc_lesb) 2727 { 2728 struct net_device *netdev = fcoe_netdev(lport); 2729 2730 __fcoe_get_lesb(lport, fc_lesb, netdev); 2731 } 2732 2733 /** 2734 * fcoe_set_port_id() - Callback from libfc when Port_ID is set. 2735 * @lport: the local port 2736 * @port_id: the port ID 2737 * @fp: the received frame, if any, that caused the port_id to be set. 2738 * 2739 * This routine handles the case where we received a FLOGI and are 2740 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi() 2741 * so it can set the non-mapped mode and gateway address. 2742 * 2743 * The FLOGI LS_ACC is handled by fcoe_flogi_resp(). 2744 */ 2745 static void fcoe_set_port_id(struct fc_lport *lport, 2746 u32 port_id, struct fc_frame *fp) 2747 { 2748 struct fcoe_port *port = lport_priv(lport); 2749 struct fcoe_interface *fcoe = port->priv; 2750 2751 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI) 2752 fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp); 2753 } 2754