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