2 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
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.
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
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.
17 * Maintained at www.Open-FCoE.org
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>
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>
42 #include <scsi/fc/fc_encaps.h>
43 #include <scsi/fc/fc_fip.h>
44 #include <scsi/fc/fc_fcoe.h>
46 #include <scsi/libfc.h>
47 #include <scsi/fc_frame.h>
48 #include <scsi/libfcoe.h>
52 MODULE_AUTHOR("Open-FCoE.org");
53 MODULE_DESCRIPTION("FCoE");
54 MODULE_LICENSE("GPL v2");
56 /* Performance tuning parameters for fcoe */
57 static unsigned int fcoe_ddp_min = 4096;
58 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
59 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
60 "Direct Data Placement (DDP).");
62 unsigned int fcoe_debug_logging;
63 module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
64 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
66 static DEFINE_MUTEX(fcoe_config_mutex);
68 static struct workqueue_struct *fcoe_wq;
70 /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */
71 static DECLARE_COMPLETION(fcoe_flush_completion);
74 /* must only by accessed under the RTNL mutex */
75 static LIST_HEAD(fcoe_hostlist);
76 static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
78 /* Function Prototypes */
79 static int fcoe_reset(struct Scsi_Host *);
80 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
81 static int fcoe_rcv(struct sk_buff *, struct net_device *,
82 struct packet_type *, struct net_device *);
83 static int fcoe_percpu_receive_thread(void *);
84 static void fcoe_percpu_clean(struct fc_lport *);
85 static int fcoe_link_ok(struct fc_lport *);
87 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
88 static int fcoe_hostlist_add(const struct fc_lport *);
89 static void fcoe_hostlist_del(const struct fc_lport *);
91 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
92 static void fcoe_dev_setup(void);
93 static void fcoe_dev_cleanup(void);
94 static struct fcoe_interface
95 *fcoe_hostlist_lookup_port(const struct net_device *);
97 static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
98 struct packet_type *, struct net_device *);
100 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
101 static void fcoe_update_src_mac(struct fc_lport *, u8 *);
102 static u8 *fcoe_get_src_mac(struct fc_lport *);
103 static void fcoe_destroy_work(struct work_struct *);
105 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
107 static int fcoe_ddp_done(struct fc_lport *, u16);
108 static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *,
110 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
111 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
112 ulong event, void *ptr);
114 static bool fcoe_match(struct net_device *netdev);
115 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode);
116 static int fcoe_destroy(struct net_device *netdev);
117 static int fcoe_enable(struct net_device *netdev);
118 static int fcoe_disable(struct net_device *netdev);
120 /* fcoe_syfs control interface handlers */
121 static int fcoe_ctlr_alloc(struct net_device *netdev);
122 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev);
125 static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
126 u32 did, struct fc_frame *,
128 void (*resp)(struct fc_seq *,
131 void *, u32 timeout);
132 static void fcoe_recv_frame(struct sk_buff *skb);
134 /* notification function for packets from net device */
135 static struct notifier_block fcoe_notifier = {
136 .notifier_call = fcoe_device_notification,
139 /* notification function for CPU hotplug events */
140 static struct notifier_block fcoe_cpu_notifier = {
141 .notifier_call = fcoe_cpu_callback,
144 /* notification function for DCB events */
145 static struct notifier_block dcb_notifier = {
146 .notifier_call = fcoe_dcb_app_notification,
149 static struct scsi_transport_template *fcoe_nport_scsi_transport;
150 static struct scsi_transport_template *fcoe_vport_scsi_transport;
152 static int fcoe_vport_destroy(struct fc_vport *);
153 static int fcoe_vport_create(struct fc_vport *, bool disabled);
154 static int fcoe_vport_disable(struct fc_vport *, bool disable);
155 static void fcoe_set_vport_symbolic_name(struct fc_vport *);
156 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
157 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *);
159 static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
160 .set_fcoe_ctlr_mode = fcoe_ctlr_set_fip_mode,
161 .set_fcoe_ctlr_enabled = fcoe_ctlr_enabled,
162 .get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb,
163 .get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb,
164 .get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb,
165 .get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb,
166 .get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb,
167 .get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb,
169 .get_fcoe_fcf_selected = fcoe_fcf_get_selected,
170 .get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id,
173 static struct libfc_function_template fcoe_libfc_fcn_templ = {
174 .frame_send = fcoe_xmit,
175 .ddp_setup = fcoe_ddp_setup,
176 .ddp_done = fcoe_ddp_done,
177 .ddp_target = fcoe_ddp_target,
178 .elsct_send = fcoe_elsct_send,
179 .get_lesb = fcoe_get_lesb,
180 .lport_set_port_id = fcoe_set_port_id,
183 static struct fc_function_template fcoe_nport_fc_functions = {
184 .show_host_node_name = 1,
185 .show_host_port_name = 1,
186 .show_host_supported_classes = 1,
187 .show_host_supported_fc4s = 1,
188 .show_host_active_fc4s = 1,
189 .show_host_maxframe_size = 1,
190 .show_host_serial_number = 1,
191 .show_host_manufacturer = 1,
192 .show_host_model = 1,
193 .show_host_model_description = 1,
194 .show_host_hardware_version = 1,
195 .show_host_driver_version = 1,
196 .show_host_firmware_version = 1,
197 .show_host_optionrom_version = 1,
199 .show_host_port_id = 1,
200 .show_host_supported_speeds = 1,
201 .get_host_speed = fc_get_host_speed,
202 .show_host_speed = 1,
203 .show_host_port_type = 1,
204 .get_host_port_state = fc_get_host_port_state,
205 .show_host_port_state = 1,
206 .show_host_symbolic_name = 1,
208 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
209 .show_rport_maxframe_size = 1,
210 .show_rport_supported_classes = 1,
212 .show_host_fabric_name = 1,
213 .show_starget_node_name = 1,
214 .show_starget_port_name = 1,
215 .show_starget_port_id = 1,
216 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
217 .show_rport_dev_loss_tmo = 1,
218 .get_fc_host_stats = fc_get_host_stats,
219 .issue_fc_host_lip = fcoe_reset,
221 .terminate_rport_io = fc_rport_terminate_io,
223 .vport_create = fcoe_vport_create,
224 .vport_delete = fcoe_vport_destroy,
225 .vport_disable = fcoe_vport_disable,
226 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
228 .bsg_request = fc_lport_bsg_request,
231 static struct fc_function_template fcoe_vport_fc_functions = {
232 .show_host_node_name = 1,
233 .show_host_port_name = 1,
234 .show_host_supported_classes = 1,
235 .show_host_supported_fc4s = 1,
236 .show_host_active_fc4s = 1,
237 .show_host_maxframe_size = 1,
238 .show_host_serial_number = 1,
239 .show_host_manufacturer = 1,
240 .show_host_model = 1,
241 .show_host_model_description = 1,
242 .show_host_hardware_version = 1,
243 .show_host_driver_version = 1,
244 .show_host_firmware_version = 1,
245 .show_host_optionrom_version = 1,
247 .show_host_port_id = 1,
248 .show_host_supported_speeds = 1,
249 .get_host_speed = fc_get_host_speed,
250 .show_host_speed = 1,
251 .show_host_port_type = 1,
252 .get_host_port_state = fc_get_host_port_state,
253 .show_host_port_state = 1,
254 .show_host_symbolic_name = 1,
256 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
257 .show_rport_maxframe_size = 1,
258 .show_rport_supported_classes = 1,
260 .show_host_fabric_name = 1,
261 .show_starget_node_name = 1,
262 .show_starget_port_name = 1,
263 .show_starget_port_id = 1,
264 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
265 .show_rport_dev_loss_tmo = 1,
266 .get_fc_host_stats = fc_get_host_stats,
267 .issue_fc_host_lip = fcoe_reset,
269 .terminate_rport_io = fc_rport_terminate_io,
271 .bsg_request = fc_lport_bsg_request,
274 static struct scsi_host_template fcoe_shost_template = {
275 .module = THIS_MODULE,
276 .name = "FCoE Driver",
277 .proc_name = FCOE_NAME,
278 .queuecommand = fc_queuecommand,
279 .eh_abort_handler = fc_eh_abort,
280 .eh_device_reset_handler = fc_eh_device_reset,
281 .eh_host_reset_handler = fc_eh_host_reset,
282 .slave_alloc = fc_slave_alloc,
283 .change_queue_depth = fc_change_queue_depth,
284 .change_queue_type = scsi_change_queue_type,
287 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
288 .use_clustering = ENABLE_CLUSTERING,
289 .sg_tablesize = SG_ALL,
290 .max_sectors = 0xffff,
292 .track_queue_depth = 1,
296 * fcoe_interface_setup() - Setup a FCoE interface
297 * @fcoe: The new FCoE interface
298 * @netdev: The net device that the fcoe interface is on
300 * Returns : 0 for success
301 * Locking: must be called with the RTNL mutex held
303 static int fcoe_interface_setup(struct fcoe_interface *fcoe,
304 struct net_device *netdev)
306 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
307 struct netdev_hw_addr *ha;
308 struct net_device *real_dev;
309 u8 flogi_maddr[ETH_ALEN];
310 const struct net_device_ops *ops;
312 fcoe->netdev = netdev;
314 /* Let LLD initialize for FCoE */
315 ops = netdev->netdev_ops;
316 if (ops->ndo_fcoe_enable) {
317 if (ops->ndo_fcoe_enable(netdev))
318 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
319 " specific feature for LLD.\n");
322 /* Do not support for bonding device */
323 if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) {
324 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
328 /* look for SAN MAC address, if multiple SAN MACs exist, only
329 * use the first one for SPMA */
330 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
331 vlan_dev_real_dev(netdev) : netdev;
332 fcoe->realdev = real_dev;
334 for_each_dev_addr(real_dev, ha) {
335 if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
336 (is_valid_ether_addr(ha->addr))) {
337 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
344 /* setup Source Mac Address */
346 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
349 * Add FCoE MAC address as second unicast MAC address
350 * or enter promiscuous mode if not capable of listening
351 * for multiple unicast MACs.
353 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
354 dev_uc_add(netdev, flogi_maddr);
356 dev_uc_add(netdev, fip->ctl_src_addr);
357 if (fip->mode == FIP_MODE_VN2VN) {
358 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
359 dev_mc_add(netdev, FIP_ALL_P2P_MACS);
361 dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
364 * setup the receive function from ethernet driver
365 * on the ethertype for the given device
367 fcoe->fcoe_packet_type.func = fcoe_rcv;
368 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
369 fcoe->fcoe_packet_type.dev = netdev;
370 dev_add_pack(&fcoe->fcoe_packet_type);
372 fcoe->fip_packet_type.func = fcoe_fip_recv;
373 fcoe->fip_packet_type.type = htons(ETH_P_FIP);
374 fcoe->fip_packet_type.dev = netdev;
375 dev_add_pack(&fcoe->fip_packet_type);
381 * fcoe_interface_create() - Create a FCoE interface on a net device
382 * @netdev: The net device to create the FCoE interface on
383 * @fip_mode: The mode to use for FIP
385 * Returns: pointer to a struct fcoe_interface or NULL on error
387 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
388 enum fip_state fip_mode)
390 struct fcoe_ctlr_device *ctlr_dev;
391 struct fcoe_ctlr *ctlr;
392 struct fcoe_interface *fcoe;
396 if (!try_module_get(THIS_MODULE)) {
397 FCOE_NETDEV_DBG(netdev,
398 "Could not get a reference to the module\n");
399 fcoe = ERR_PTR(-EBUSY);
403 size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface);
404 ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ,
407 FCOE_DBG("Failed to add fcoe_ctlr_device\n");
408 fcoe = ERR_PTR(-ENOMEM);
412 ctlr = fcoe_ctlr_device_priv(ctlr_dev);
413 ctlr->cdev = ctlr_dev;
414 fcoe = fcoe_ctlr_priv(ctlr);
421 fcoe_ctlr_init(ctlr, fip_mode);
422 ctlr->send = fcoe_fip_send;
423 ctlr->update_mac = fcoe_update_src_mac;
424 ctlr->get_src_addr = fcoe_get_src_mac;
426 err = fcoe_interface_setup(fcoe, netdev);
428 fcoe_ctlr_destroy(ctlr);
429 fcoe_ctlr_device_delete(ctlr_dev);
438 module_put(THIS_MODULE);
444 * fcoe_interface_remove() - remove FCoE interface from netdev
445 * @fcoe: The FCoE interface to be cleaned up
447 * Caller must be holding the RTNL mutex
449 static void fcoe_interface_remove(struct fcoe_interface *fcoe)
451 struct net_device *netdev = fcoe->netdev;
452 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
453 u8 flogi_maddr[ETH_ALEN];
454 const struct net_device_ops *ops;
457 * Don't listen for Ethernet packets anymore.
458 * synchronize_net() ensures that the packet handlers are not running
459 * on another CPU. dev_remove_pack() would do that, this calls the
460 * unsyncronized version __dev_remove_pack() to avoid multiple delays.
462 __dev_remove_pack(&fcoe->fcoe_packet_type);
463 __dev_remove_pack(&fcoe->fip_packet_type);
466 /* Delete secondary MAC addresses */
467 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
468 dev_uc_del(netdev, flogi_maddr);
470 dev_uc_del(netdev, fip->ctl_src_addr);
471 if (fip->mode == FIP_MODE_VN2VN) {
472 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
473 dev_mc_del(netdev, FIP_ALL_P2P_MACS);
475 dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
477 /* Tell the LLD we are done w/ FCoE */
478 ops = netdev->netdev_ops;
479 if (ops->ndo_fcoe_disable) {
480 if (ops->ndo_fcoe_disable(netdev))
481 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
482 " specific feature for LLD.\n");
489 * fcoe_interface_cleanup() - Clean up a FCoE interface
490 * @fcoe: The FCoE interface to be cleaned up
492 static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
494 struct net_device *netdev = fcoe->netdev;
495 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
499 fcoe_interface_remove(fcoe);
502 /* Release the self-reference taken during fcoe_interface_create() */
503 /* tear-down the FCoE controller */
504 fcoe_ctlr_destroy(fip);
505 scsi_host_put(fip->lp->host);
507 module_put(THIS_MODULE);
511 * fcoe_fip_recv() - Handler for received FIP frames
512 * @skb: The receive skb
513 * @netdev: The associated net device
514 * @ptype: The packet_type structure which was used to register this handler
515 * @orig_dev: The original net_device the the skb was received on.
516 * (in case dev is a bond)
518 * Returns: 0 for success
520 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
521 struct packet_type *ptype,
522 struct net_device *orig_dev)
524 struct fcoe_interface *fcoe;
525 struct fcoe_ctlr *ctlr;
527 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
528 ctlr = fcoe_to_ctlr(fcoe);
529 fcoe_ctlr_recv(ctlr, skb);
534 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
535 * @port: The FCoE port
536 * @skb: The FIP/FCoE packet to be sent
538 static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
540 if (port->fcoe_pending_queue.qlen)
541 fcoe_check_wait_queue(port->lport, skb);
542 else if (fcoe_start_io(skb))
543 fcoe_check_wait_queue(port->lport, skb);
547 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
548 * @fip: The FCoE controller
549 * @skb: The FIP packet to be sent
551 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
553 skb->dev = fcoe_from_ctlr(fip)->netdev;
554 fcoe_port_send(lport_priv(fip->lp), skb);
558 * fcoe_update_src_mac() - Update the Ethernet MAC filters
559 * @lport: The local port to update the source MAC on
560 * @addr: Unicast MAC address to add
562 * Remove any previously-set unicast MAC filter.
563 * Add secondary FCoE MAC address filter for our OUI.
565 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
567 struct fcoe_port *port = lport_priv(lport);
568 struct fcoe_interface *fcoe = port->priv;
570 if (!is_zero_ether_addr(port->data_src_addr))
571 dev_uc_del(fcoe->netdev, port->data_src_addr);
572 if (!is_zero_ether_addr(addr))
573 dev_uc_add(fcoe->netdev, addr);
574 memcpy(port->data_src_addr, addr, ETH_ALEN);
578 * fcoe_get_src_mac() - return the Ethernet source address for an lport
579 * @lport: libfc lport
581 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
583 struct fcoe_port *port = lport_priv(lport);
585 return port->data_src_addr;
589 * fcoe_lport_config() - Set up a local port
590 * @lport: The local port to be setup
592 * Returns: 0 for success
594 static int fcoe_lport_config(struct fc_lport *lport)
598 lport->max_retry_count = 3;
599 lport->max_rport_retry_count = 3;
600 lport->e_d_tov = 2 * 1000; /* FC-FS default */
601 lport->r_a_tov = 2 * 2 * 1000;
602 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
603 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
604 lport->does_npiv = 1;
606 fc_lport_init_stats(lport);
608 /* lport fc_lport related configuration */
609 fc_lport_config(lport);
611 /* offload related configuration */
612 lport->crc_offload = 0;
613 lport->seq_offload = 0;
614 lport->lro_enabled = 0;
622 * fcoe_netdev_features_change - Updates the lport's offload flags based
623 * on the LLD netdev's FCoE feature flags
625 static void fcoe_netdev_features_change(struct fc_lport *lport,
626 struct net_device *netdev)
628 mutex_lock(&lport->lp_mutex);
630 if (netdev->features & NETIF_F_SG)
635 if (netdev->features & NETIF_F_FCOE_CRC) {
636 lport->crc_offload = 1;
637 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
639 lport->crc_offload = 0;
642 if (netdev->features & NETIF_F_FSO) {
643 lport->seq_offload = 1;
644 lport->lso_max = netdev->gso_max_size;
645 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
648 lport->seq_offload = 0;
652 if (netdev->fcoe_ddp_xid) {
653 lport->lro_enabled = 1;
654 lport->lro_xid = netdev->fcoe_ddp_xid;
655 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
658 lport->lro_enabled = 0;
662 mutex_unlock(&lport->lp_mutex);
666 * fcoe_netdev_config() - Set up net devive for SW FCoE
667 * @lport: The local port that is associated with the net device
668 * @netdev: The associated net device
670 * Must be called after fcoe_lport_config() as it will use local port mutex
672 * Returns: 0 for success
674 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
678 struct fcoe_interface *fcoe;
679 struct fcoe_ctlr *ctlr;
680 struct fcoe_port *port;
682 /* Setup lport private data to point to fcoe softc */
683 port = lport_priv(lport);
685 ctlr = fcoe_to_ctlr(fcoe);
688 * Determine max frame size based on underlying device and optional
689 * user-configured limit. If the MFS is too low, fcoe_link_ok()
690 * will return 0, so do this first.
693 if (netdev->features & NETIF_F_FCOE_MTU) {
695 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
697 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
698 if (fc_set_mfs(lport, mfs))
701 /* offload features support */
702 fcoe_netdev_features_change(lport, netdev);
704 skb_queue_head_init(&port->fcoe_pending_queue);
705 port->fcoe_pending_queue_active = 0;
706 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
708 fcoe_link_speed_update(lport);
711 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
712 wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
713 fc_set_wwnn(lport, wwnn);
714 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
715 wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
717 fc_set_wwpn(lport, wwpn);
724 * fcoe_shost_config() - Set up the SCSI host associated with a local port
725 * @lport: The local port
726 * @dev: The device associated with the SCSI host
728 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
730 * Returns: 0 for success
732 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
736 /* lport scsi host config */
737 lport->host->max_lun = FCOE_MAX_LUN;
738 lport->host->max_id = FCOE_MAX_FCP_TARGET;
739 lport->host->max_channel = 0;
740 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
743 lport->host->transportt = fcoe_vport_scsi_transport;
745 lport->host->transportt = fcoe_nport_scsi_transport;
747 /* add the new host to the SCSI-ml */
748 rc = scsi_add_host(lport->host, dev);
750 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
751 "error on scsi_add_host\n");
756 fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
758 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
759 "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
760 fcoe_netdev(lport)->name);
767 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE
768 * @lport: The local port that is associated with the net device
769 * @netdev: The associated net device
771 * Must be called after fcoe_shost_config() as it will use local port mutex
774 static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
776 struct fcoe_interface *fcoe;
777 struct fcoe_port *port;
778 struct net_device *realdev;
781 port = lport_priv(lport);
783 realdev = fcoe->realdev;
788 /* No FDMI state m/c for NPIV ports */
792 if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
793 struct netdev_fcoe_hbainfo *fdmi;
794 fdmi = kzalloc(sizeof(*fdmi), GFP_KERNEL);
798 rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
801 printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
802 "information from netdev.\n");
806 snprintf(fc_host_serial_number(lport->host),
807 FC_SERIAL_NUMBER_SIZE,
809 fdmi->serial_number);
810 snprintf(fc_host_manufacturer(lport->host),
811 FC_SERIAL_NUMBER_SIZE,
814 snprintf(fc_host_model(lport->host),
815 FC_SYMBOLIC_NAME_SIZE,
818 snprintf(fc_host_model_description(lport->host),
819 FC_SYMBOLIC_NAME_SIZE,
821 fdmi->model_description);
822 snprintf(fc_host_hardware_version(lport->host),
823 FC_VERSION_STRING_SIZE,
825 fdmi->hardware_version);
826 snprintf(fc_host_driver_version(lport->host),
827 FC_VERSION_STRING_SIZE,
829 fdmi->driver_version);
830 snprintf(fc_host_optionrom_version(lport->host),
831 FC_VERSION_STRING_SIZE,
833 fdmi->optionrom_version);
834 snprintf(fc_host_firmware_version(lport->host),
835 FC_VERSION_STRING_SIZE,
837 fdmi->firmware_version);
839 /* Enable FDMI lport states */
840 lport->fdmi_enabled = 1;
843 lport->fdmi_enabled = 0;
844 printk(KERN_INFO "fcoe: No FDMI support.\n");
849 * fcoe_oem_match() - The match routine for the offloaded exchange manager
852 * This routine will be associated with an exchange manager (EM). When
853 * the libfc exchange handling code is looking for an EM to use it will
854 * call this routine and pass it the frame that it wishes to send. This
855 * routine will return True if the associated EM is to be used and False
856 * if the echange code should continue looking for an EM.
858 * The offload EM that this routine is associated with will handle any
859 * packets that are for SCSI read requests.
861 * This has been enhanced to work when FCoE stack is operating in target
864 * Returns: True for read types I/O, otherwise returns false.
866 static bool fcoe_oem_match(struct fc_frame *fp)
868 struct fc_frame_header *fh = fc_frame_header_get(fp);
869 struct fcp_cmnd *fcp;
871 if (fc_fcp_is_read(fr_fsp(fp)) &&
872 (fr_fsp(fp)->data_len > fcoe_ddp_min))
874 else if ((fr_fsp(fp) == NULL) &&
875 (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
876 (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
877 fcp = fc_frame_payload_get(fp, sizeof(*fcp));
878 if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
879 (ntohl(fcp->fc_dl) > fcoe_ddp_min))
886 * fcoe_em_config() - Allocate and configure an exchange manager
887 * @lport: The local port that the new EM will be associated with
889 * Returns: 0 on success
891 static inline int fcoe_em_config(struct fc_lport *lport)
893 struct fcoe_port *port = lport_priv(lport);
894 struct fcoe_interface *fcoe = port->priv;
895 struct fcoe_interface *oldfcoe = NULL;
896 struct net_device *old_real_dev, *cur_real_dev;
897 u16 min_xid = FCOE_MIN_XID;
898 u16 max_xid = FCOE_MAX_XID;
901 * Check if need to allocate an em instance for
902 * offload exchange ids to be shared across all VN_PORTs/lport.
904 if (!lport->lro_enabled || !lport->lro_xid ||
905 (lport->lro_xid >= max_xid)) {
911 * Reuse existing offload em instance in case
912 * it is already allocated on real eth device
914 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
915 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
917 cur_real_dev = fcoe->netdev;
919 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
920 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
921 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
923 old_real_dev = oldfcoe->netdev;
925 if (cur_real_dev == old_real_dev) {
926 fcoe->oem = oldfcoe->oem;
932 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
933 printk(KERN_ERR "fcoe_em_config: failed to add "
934 "offload em:%p on interface:%s\n",
935 fcoe->oem, fcoe->netdev->name);
939 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
940 FCOE_MIN_XID, lport->lro_xid,
943 printk(KERN_ERR "fcoe_em_config: failed to allocate "
944 "em for offload exches on interface:%s\n",
951 * Exclude offload EM xid range from next EM xid range.
953 min_xid += lport->lro_xid + 1;
956 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
957 printk(KERN_ERR "fcoe_em_config: failed to "
958 "allocate em on interface %s\n", fcoe->netdev->name);
966 * fcoe_if_destroy() - Tear down a SW FCoE instance
967 * @lport: The local port to be destroyed
970 static void fcoe_if_destroy(struct fc_lport *lport)
972 struct fcoe_port *port = lport_priv(lport);
973 struct fcoe_interface *fcoe = port->priv;
974 struct net_device *netdev = fcoe->netdev;
976 FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
978 /* Logout of the fabric */
979 fc_fabric_logoff(lport);
981 /* Cleanup the fc_lport */
982 fc_lport_destroy(lport);
984 /* Stop the transmit retry timer */
985 del_timer_sync(&port->timer);
987 /* Free existing transmit skbs */
988 fcoe_clean_pending_queue(lport);
991 if (!is_zero_ether_addr(port->data_src_addr))
992 dev_uc_del(netdev, port->data_src_addr);
996 fcoe_interface_remove(fcoe);
999 /* Free queued packets for the per-CPU receive threads */
1000 fcoe_percpu_clean(lport);
1002 /* Detach from the scsi-ml */
1003 fc_remove_host(lport->host);
1004 scsi_remove_host(lport->host);
1006 /* Destroy lport scsi_priv */
1007 fc_fcp_destroy(lport);
1009 /* There are no more rports or I/O, free the EM */
1010 fc_exch_mgr_free(lport);
1012 /* Free memory used by statistical counters */
1013 fc_lport_free_stats(lport);
1016 * Release the Scsi_Host for vport but hold on to
1017 * master lport until it fcoe interface fully cleaned-up.
1020 scsi_host_put(lport->host);
1024 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
1025 * @lport: The local port to setup DDP for
1026 * @xid: The exchange ID for this DDP transfer
1027 * @sgl: The scatterlist describing this transfer
1028 * @sgc: The number of sg items
1030 * Returns: 0 if the DDP context was not configured
1032 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
1033 struct scatterlist *sgl, unsigned int sgc)
1035 struct net_device *netdev = fcoe_netdev(lport);
1037 if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
1038 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
1046 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device
1047 * @lport: The local port to setup DDP for
1048 * @xid: The exchange ID for this DDP transfer
1049 * @sgl: The scatterlist describing this transfer
1050 * @sgc: The number of sg items
1052 * Returns: 0 if the DDP context was not configured
1054 static int fcoe_ddp_target(struct fc_lport *lport, u16 xid,
1055 struct scatterlist *sgl, unsigned int sgc)
1057 struct net_device *netdev = fcoe_netdev(lport);
1059 if (netdev->netdev_ops->ndo_fcoe_ddp_target)
1060 return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
1068 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
1069 * @lport: The local port to complete DDP on
1070 * @xid: The exchange ID for this DDP transfer
1072 * Returns: the length of data that have been completed by DDP
1074 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
1076 struct net_device *netdev = fcoe_netdev(lport);
1078 if (netdev->netdev_ops->ndo_fcoe_ddp_done)
1079 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
1084 * fcoe_if_create() - Create a FCoE instance on an interface
1085 * @fcoe: The FCoE interface to create a local port on
1086 * @parent: The device pointer to be the parent in sysfs for the SCSI host
1087 * @npiv: Indicates if the port is a vport or not
1089 * Creates a fc_lport instance and a Scsi_Host instance and configure them.
1091 * Returns: The allocated fc_lport or an error pointer
1093 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
1094 struct device *parent, int npiv)
1096 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1097 struct net_device *netdev = fcoe->netdev;
1098 struct fc_lport *lport, *n_port;
1099 struct fcoe_port *port;
1100 struct Scsi_Host *shost;
1103 * parent is only a vport if npiv is 1,
1104 * but we'll only use vport in that case so go ahead and set it
1106 struct fc_vport *vport = dev_to_vport(parent);
1108 FCOE_NETDEV_DBG(netdev, "Create Interface\n");
1111 lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port));
1113 lport = libfc_vport_create(vport, sizeof(*port));
1116 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
1120 port = lport_priv(lport);
1121 port->lport = lport;
1123 port->get_netdev = fcoe_netdev;
1124 port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
1125 port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
1126 INIT_WORK(&port->destroy_work, fcoe_destroy_work);
1129 * Need to add the lport to the hostlist
1130 * so we catch NETDEV_CHANGE events.
1132 fcoe_hostlist_add(lport);
1134 /* configure a fc_lport including the exchange manager */
1135 rc = fcoe_lport_config(lport);
1137 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
1143 FCOE_NETDEV_DBG(netdev, "Setting vport names, "
1144 "%16.16llx %16.16llx\n",
1145 vport->node_name, vport->port_name);
1146 fc_set_wwnn(lport, vport->node_name);
1147 fc_set_wwpn(lport, vport->port_name);
1150 /* configure lport network properties */
1151 rc = fcoe_netdev_config(lport, netdev);
1153 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
1155 goto out_lp_destroy;
1158 /* configure lport scsi host properties */
1159 rc = fcoe_shost_config(lport, parent);
1161 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
1163 goto out_lp_destroy;
1166 /* Initialize the library */
1167 rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1);
1169 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
1171 goto out_lp_destroy;
1174 /* Initialized FDMI information */
1175 fcoe_fdmi_info(lport, netdev);
1178 * fcoe_em_alloc() and fcoe_hostlist_add() both
1179 * need to be atomic with respect to other changes to the
1180 * hostlist since fcoe_em_alloc() looks for an existing EM
1181 * instance on host list updated by fcoe_hostlist_add().
1183 * This is currently handled through the fcoe_config_mutex
1187 /* lport exch manager allocation */
1188 rc = fcoe_em_config(lport);
1190 shost = vport_to_shost(vport);
1191 n_port = shost_priv(shost);
1192 rc = fc_exch_mgr_list_clone(n_port, lport);
1196 FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
1197 goto out_lp_destroy;
1203 fc_exch_mgr_free(lport);
1205 fcoe_hostlist_del(lport);
1206 scsi_host_put(lport->host);
1212 * fcoe_if_init() - Initialization routine for fcoe.ko
1214 * Attaches the SW FCoE transport to the FC transport
1216 * Returns: 0 on success
1218 static int __init fcoe_if_init(void)
1220 /* attach to scsi transport */
1221 fcoe_nport_scsi_transport =
1222 fc_attach_transport(&fcoe_nport_fc_functions);
1223 fcoe_vport_scsi_transport =
1224 fc_attach_transport(&fcoe_vport_fc_functions);
1226 if (!fcoe_nport_scsi_transport) {
1227 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1235 * fcoe_if_exit() - Tear down fcoe.ko
1237 * Detaches the SW FCoE transport from the FC transport
1239 * Returns: 0 on success
1241 static int __exit fcoe_if_exit(void)
1243 fc_release_transport(fcoe_nport_scsi_transport);
1244 fc_release_transport(fcoe_vport_scsi_transport);
1245 fcoe_nport_scsi_transport = NULL;
1246 fcoe_vport_scsi_transport = NULL;
1251 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU
1252 * @cpu: The CPU index of the CPU to create a receive thread for
1254 static void fcoe_percpu_thread_create(unsigned int cpu)
1256 struct fcoe_percpu_s *p;
1257 struct task_struct *thread;
1259 p = &per_cpu(fcoe_percpu, cpu);
1261 thread = kthread_create_on_node(fcoe_percpu_receive_thread,
1262 (void *)p, cpu_to_node(cpu),
1263 "fcoethread/%d", cpu);
1265 if (likely(!IS_ERR(thread))) {
1266 kthread_bind(thread, cpu);
1267 wake_up_process(thread);
1269 spin_lock_bh(&p->fcoe_rx_list.lock);
1271 spin_unlock_bh(&p->fcoe_rx_list.lock);
1276 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
1277 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed
1279 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
1280 * current CPU's Rx thread. If the thread being destroyed is bound to
1281 * the CPU processing this context the skbs will be freed.
1283 static void fcoe_percpu_thread_destroy(unsigned int cpu)
1285 struct fcoe_percpu_s *p;
1286 struct task_struct *thread;
1287 struct page *crc_eof;
1288 struct sk_buff *skb;
1290 struct fcoe_percpu_s *p0;
1291 unsigned targ_cpu = get_cpu();
1292 #endif /* CONFIG_SMP */
1294 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
1296 /* Prevent any new skbs from being queued for this CPU. */
1297 p = &per_cpu(fcoe_percpu, cpu);
1298 spin_lock_bh(&p->fcoe_rx_list.lock);
1301 crc_eof = p->crc_eof_page;
1302 p->crc_eof_page = NULL;
1303 p->crc_eof_offset = 0;
1304 spin_unlock_bh(&p->fcoe_rx_list.lock);
1308 * Don't bother moving the skb's if this context is running
1309 * on the same CPU that is having its thread destroyed. This
1310 * can easily happen when the module is removed.
1312 if (cpu != targ_cpu) {
1313 p0 = &per_cpu(fcoe_percpu, targ_cpu);
1314 spin_lock_bh(&p0->fcoe_rx_list.lock);
1316 FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
1319 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1320 __skb_queue_tail(&p0->fcoe_rx_list, skb);
1321 spin_unlock_bh(&p0->fcoe_rx_list.lock);
1324 * The targeted CPU is not initialized and cannot accept
1325 * new skbs. Unlock the targeted CPU and drop the skbs
1326 * on the CPU that is going offline.
1328 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1330 spin_unlock_bh(&p0->fcoe_rx_list.lock);
1334 * This scenario occurs when the module is being removed
1335 * and all threads are being destroyed. skbs will continue
1336 * to be shifted from the CPU thread that is being removed
1337 * to the CPU thread associated with the CPU that is processing
1338 * the module removal. Once there is only one CPU Rx thread it
1339 * will reach this case and we will drop all skbs and later
1342 spin_lock_bh(&p->fcoe_rx_list.lock);
1343 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1345 spin_unlock_bh(&p->fcoe_rx_list.lock);
1350 * This a non-SMP scenario where the singular Rx thread is
1351 * being removed. Free all skbs and stop the thread.
1353 spin_lock_bh(&p->fcoe_rx_list.lock);
1354 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1356 spin_unlock_bh(&p->fcoe_rx_list.lock);
1360 kthread_stop(thread);
1367 * fcoe_cpu_callback() - Handler for CPU hotplug events
1368 * @nfb: The callback data block
1369 * @action: The event triggering the callback
1370 * @hcpu: The index of the CPU that the event is for
1372 * This creates or destroys per-CPU data for fcoe
1374 * Returns NOTIFY_OK always.
1376 static int fcoe_cpu_callback(struct notifier_block *nfb,
1377 unsigned long action, void *hcpu)
1379 unsigned cpu = (unsigned long)hcpu;
1383 case CPU_ONLINE_FROZEN:
1384 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
1385 fcoe_percpu_thread_create(cpu);
1388 case CPU_DEAD_FROZEN:
1389 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
1390 fcoe_percpu_thread_destroy(cpu);
1399 * fcoe_select_cpu() - Selects CPU to handle post-processing of incoming
1402 * This routine selects next CPU based on cpumask to distribute
1403 * incoming requests in round robin.
1405 * Returns: int CPU number
1407 static inline unsigned int fcoe_select_cpu(void)
1409 static unsigned int selected_cpu;
1411 selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
1412 if (selected_cpu >= nr_cpu_ids)
1413 selected_cpu = cpumask_first(cpu_online_mask);
1415 return selected_cpu;
1419 * fcoe_rcv() - Receive packets from a net device
1420 * @skb: The received packet
1421 * @netdev: The net device that the packet was received on
1422 * @ptype: The packet type context
1423 * @olddev: The last device net device
1425 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1426 * FC frame and passes the frame to libfc.
1428 * Returns: 0 for success
1430 static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1431 struct packet_type *ptype, struct net_device *olddev)
1433 struct fc_lport *lport;
1434 struct fcoe_rcv_info *fr;
1435 struct fcoe_ctlr *ctlr;
1436 struct fcoe_interface *fcoe;
1437 struct fc_frame_header *fh;
1438 struct fcoe_percpu_s *fps;
1442 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1443 ctlr = fcoe_to_ctlr(fcoe);
1445 if (unlikely(!lport)) {
1446 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure\n");
1449 if (!lport->link_up)
1452 FCOE_NETDEV_DBG(netdev,
1453 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1454 skb->len, skb->data_len, skb->head, skb->data,
1455 skb_tail_pointer(skb), skb_end_pointer(skb),
1456 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1459 skb = skb_share_check(skb, GFP_ATOMIC);
1466 if (is_fip_mode(ctlr) &&
1467 !ether_addr_equal(eh->h_source, ctlr->dest_addr)) {
1468 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1474 * Check for minimum frame length, and make sure required FCoE
1475 * and FC headers are pulled into the linear data area.
1477 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1478 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1481 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1482 fh = (struct fc_frame_header *) skb_transport_header(skb);
1484 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1485 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1490 fr = fcoe_dev_from_skb(skb);
1494 * In case the incoming frame's exchange is originated from
1495 * the initiator, then received frame's exchange id is ANDed
1496 * with fc_cpu_mask bits to get the same cpu on which exchange
1497 * was originated, otherwise select cpu using rx exchange id
1498 * or fcoe_select_cpu().
1500 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1501 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1503 if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
1504 cpu = fcoe_select_cpu();
1506 cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
1509 if (cpu >= nr_cpu_ids)
1512 fps = &per_cpu(fcoe_percpu, cpu);
1513 spin_lock(&fps->fcoe_rx_list.lock);
1514 if (unlikely(!fps->thread)) {
1516 * The targeted CPU is not ready, let's target
1517 * the first CPU now. For non-SMP systems this
1518 * will check the same CPU twice.
1520 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
1521 "ready for incoming skb- using first online "
1524 spin_unlock(&fps->fcoe_rx_list.lock);
1525 cpu = cpumask_first(cpu_online_mask);
1526 fps = &per_cpu(fcoe_percpu, cpu);
1527 spin_lock(&fps->fcoe_rx_list.lock);
1529 spin_unlock(&fps->fcoe_rx_list.lock);
1535 * We now have a valid CPU that we're targeting for
1536 * this skb. We also have this receive thread locked,
1537 * so we're free to queue skbs into it's queue.
1541 * Note: We used to have a set of conditions under which we would
1542 * call fcoe_recv_frame directly, rather than queuing to the rx list
1543 * as it could save a few cycles, but doing so is prohibited, as
1544 * fcoe_recv_frame has several paths that may sleep, which is forbidden
1545 * in softirq context.
1547 __skb_queue_tail(&fps->fcoe_rx_list, skb);
1548 if (fps->thread->state == TASK_INTERRUPTIBLE)
1549 wake_up_process(fps->thread);
1550 spin_unlock(&fps->fcoe_rx_list.lock);
1552 return NET_RX_SUCCESS;
1554 per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++;
1562 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1563 * @skb: The packet to be transmitted
1564 * @tlen: The total length of the trailer
1566 * Returns: 0 for success
1568 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
1570 struct fcoe_percpu_s *fps;
1573 fps = &get_cpu_var(fcoe_percpu);
1574 rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
1575 put_cpu_var(fcoe_percpu);
1581 * fcoe_xmit() - Transmit a FCoE frame
1582 * @lport: The local port that the frame is to be transmitted for
1583 * @fp: The frame to be transmitted
1585 * Return: 0 for success
1587 static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1592 struct fcoe_crc_eof *cp;
1593 struct sk_buff *skb;
1594 struct fc_stats *stats;
1595 struct fc_frame_header *fh;
1596 unsigned int hlen; /* header length implies the version */
1597 unsigned int tlen; /* trailer length */
1598 unsigned int elen; /* eth header, may include vlan */
1599 struct fcoe_port *port = lport_priv(lport);
1600 struct fcoe_interface *fcoe = port->priv;
1601 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
1603 struct fcoe_hdr *hp;
1605 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1607 fh = fc_frame_header_get(fp);
1609 wlen = skb->len / FCOE_WORD_TO_BYTE;
1611 if (!lport->link_up) {
1616 if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1617 fcoe_ctlr_els_send(ctlr, lport, skb))
1623 elen = sizeof(struct ethhdr);
1624 hlen = sizeof(struct fcoe_hdr);
1625 tlen = sizeof(struct fcoe_crc_eof);
1626 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1629 if (likely(lport->crc_offload)) {
1630 skb->ip_summed = CHECKSUM_UNNECESSARY;
1631 skb->csum_start = skb_headroom(skb);
1632 skb->csum_offset = skb->len;
1635 skb->ip_summed = CHECKSUM_NONE;
1636 crc = fcoe_fc_crc(fp);
1639 /* copy port crc and eof to the skb buff */
1640 if (skb_is_nonlinear(skb)) {
1642 if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
1646 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1647 cp = kmap_atomic(skb_frag_page(frag))
1648 + frag->page_offset;
1650 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1653 memset(cp, 0, sizeof(*cp));
1655 cp->fcoe_crc32 = cpu_to_le32(~crc);
1657 if (skb_is_nonlinear(skb)) {
1662 /* adjust skb network/transport offsets to match mac/fcoe/port */
1663 skb_push(skb, elen + hlen);
1664 skb_reset_mac_header(skb);
1665 skb_reset_network_header(skb);
1666 skb->mac_len = elen;
1667 skb->protocol = htons(ETH_P_FCOE);
1668 skb->priority = fcoe->priority;
1670 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN &&
1671 fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
1672 /* must set skb->dev before calling vlan_put_tag */
1673 skb->dev = fcoe->realdev;
1674 skb = __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1675 vlan_dev_vlan_id(fcoe->netdev));
1679 skb->dev = fcoe->netdev;
1681 /* fill up mac and fcoe headers */
1683 eh->h_proto = htons(ETH_P_FCOE);
1684 memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
1686 memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1688 if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
1689 memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
1691 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1693 hp = (struct fcoe_hdr *)(eh + 1);
1694 memset(hp, 0, sizeof(*hp));
1696 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1699 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1700 if (lport->seq_offload && fr_max_payload(fp)) {
1701 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1702 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1704 skb_shinfo(skb)->gso_type = 0;
1705 skb_shinfo(skb)->gso_size = 0;
1707 /* update tx stats: regardless if LLD fails */
1708 stats = per_cpu_ptr(lport->stats, get_cpu());
1710 stats->TxWords += wlen;
1713 /* send down to lld */
1715 fcoe_port_send(port, skb);
1720 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
1721 * @skb: The completed skb (argument required by destructor)
1723 static void fcoe_percpu_flush_done(struct sk_buff *skb)
1725 complete(&fcoe_flush_completion);
1729 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
1730 * @lport: The local port the frame was received on
1731 * @fp: The received frame
1733 * Return: 0 on passing filtering checks
1735 static inline int fcoe_filter_frames(struct fc_lport *lport,
1736 struct fc_frame *fp)
1738 struct fcoe_ctlr *ctlr;
1739 struct fcoe_interface *fcoe;
1740 struct fc_frame_header *fh;
1741 struct sk_buff *skb = (struct sk_buff *)fp;
1742 struct fc_stats *stats;
1745 * We only check CRC if no offload is available and if it is
1746 * it's solicited data, in which case, the FCP layer would
1747 * check it during the copy.
1749 if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
1750 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1752 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1754 fh = (struct fc_frame_header *) skb_transport_header(skb);
1755 fh = fc_frame_header_get(fp);
1756 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
1759 fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
1760 ctlr = fcoe_to_ctlr(fcoe);
1761 if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
1762 ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
1763 FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
1767 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
1768 le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
1769 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1773 stats = per_cpu_ptr(lport->stats, get_cpu());
1774 stats->InvalidCRCCount++;
1775 if (stats->InvalidCRCCount < 5)
1776 printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
1782 * fcoe_recv_frame() - process a single received frame
1783 * @skb: frame to process
1785 static void fcoe_recv_frame(struct sk_buff *skb)
1788 struct fc_lport *lport;
1789 struct fcoe_rcv_info *fr;
1790 struct fc_stats *stats;
1791 struct fcoe_crc_eof crc_eof;
1792 struct fc_frame *fp;
1793 struct fcoe_port *port;
1794 struct fcoe_hdr *hp;
1796 fr = fcoe_dev_from_skb(skb);
1798 if (unlikely(!lport)) {
1799 if (skb->destructor != fcoe_percpu_flush_done)
1800 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
1805 FCOE_NETDEV_DBG(skb->dev,
1806 "skb_info: len:%d data_len:%d head:%p data:%p tail:%p end:%p sum:%d dev:%s\n",
1807 skb->len, skb->data_len,
1808 skb->head, skb->data, skb_tail_pointer(skb),
1809 skb_end_pointer(skb), skb->csum,
1810 skb->dev ? skb->dev->name : "<NULL>");
1812 port = lport_priv(lport);
1813 skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
1816 * Frame length checks and setting up the header pointers
1817 * was done in fcoe_rcv already.
1819 hp = (struct fcoe_hdr *) skb_network_header(skb);
1821 stats = per_cpu_ptr(lport->stats, get_cpu());
1822 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1823 if (stats->ErrorFrames < 5)
1824 printk(KERN_WARNING "fcoe: FCoE version "
1825 "mismatch: The frame has "
1826 "version %x, but the "
1827 "initiator supports version "
1828 "%x\n", FC_FCOE_DECAPS_VER(hp),
1833 skb_pull(skb, sizeof(struct fcoe_hdr));
1834 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1837 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1839 fp = (struct fc_frame *)skb;
1842 fr_sof(fp) = hp->fcoe_sof;
1844 /* Copy out the CRC and EOF trailer for access */
1845 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1847 fr_eof(fp) = crc_eof.fcoe_eof;
1848 fr_crc(fp) = crc_eof.fcoe_crc32;
1849 if (pskb_trim(skb, fr_len))
1852 if (!fcoe_filter_frames(lport, fp)) {
1854 fc_exch_recv(lport, fp);
1858 stats->ErrorFrames++;
1864 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread
1865 * @arg: The per-CPU context
1867 * Return: 0 for success
1869 static int fcoe_percpu_receive_thread(void *arg)
1871 struct fcoe_percpu_s *p = arg;
1872 struct sk_buff *skb;
1873 struct sk_buff_head tmp;
1875 skb_queue_head_init(&tmp);
1877 set_user_nice(current, MIN_NICE);
1880 while (!kthread_should_stop()) {
1882 spin_lock_bh(&p->fcoe_rx_list.lock);
1883 skb_queue_splice_init(&p->fcoe_rx_list, &tmp);
1885 if (!skb_queue_len(&tmp)) {
1886 set_current_state(TASK_INTERRUPTIBLE);
1887 spin_unlock_bh(&p->fcoe_rx_list.lock);
1892 spin_unlock_bh(&p->fcoe_rx_list.lock);
1894 while ((skb = __skb_dequeue(&tmp)) != NULL)
1895 fcoe_recv_frame(skb);
1902 * fcoe_dev_setup() - Setup the link change notification interface
1904 static void fcoe_dev_setup(void)
1906 register_dcbevent_notifier(&dcb_notifier);
1907 register_netdevice_notifier(&fcoe_notifier);
1911 * fcoe_dev_cleanup() - Cleanup the link change notification interface
1913 static void fcoe_dev_cleanup(void)
1915 unregister_dcbevent_notifier(&dcb_notifier);
1916 unregister_netdevice_notifier(&fcoe_notifier);
1919 static struct fcoe_interface *
1920 fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
1922 struct fcoe_interface *fcoe;
1923 struct net_device *real_dev;
1925 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1926 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
1927 real_dev = vlan_dev_real_dev(fcoe->netdev);
1929 real_dev = fcoe->netdev;
1931 if (netdev == real_dev)
1937 static int fcoe_dcb_app_notification(struct notifier_block *notifier,
1938 ulong event, void *ptr)
1940 struct dcb_app_type *entry = ptr;
1941 struct fcoe_ctlr *ctlr;
1942 struct fcoe_interface *fcoe;
1943 struct net_device *netdev;
1946 if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
1949 netdev = dev_get_by_index(&init_net, entry->ifindex);
1953 fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
1958 ctlr = fcoe_to_ctlr(fcoe);
1960 if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
1961 prio = ffs(entry->app.priority) - 1;
1963 prio = entry->app.priority;
1968 if (entry->app.protocol == ETH_P_FIP ||
1969 entry->app.protocol == ETH_P_FCOE)
1970 ctlr->priority = prio;
1972 if (entry->app.protocol == ETH_P_FCOE)
1973 fcoe->priority = prio;
1979 * fcoe_device_notification() - Handler for net device events
1980 * @notifier: The context of the notification
1981 * @event: The type of event
1982 * @ptr: The net device that the event was on
1984 * This function is called by the Ethernet driver in case of link change event.
1986 * Returns: 0 for success
1988 static int fcoe_device_notification(struct notifier_block *notifier,
1989 ulong event, void *ptr)
1991 struct fcoe_ctlr_device *cdev;
1992 struct fc_lport *lport = NULL;
1993 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1994 struct fcoe_ctlr *ctlr;
1995 struct fcoe_interface *fcoe;
1996 struct fcoe_port *port;
1997 struct fc_stats *stats;
1998 u32 link_possible = 1;
2002 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2003 if (fcoe->netdev == netdev) {
2004 ctlr = fcoe_to_ctlr(fcoe);
2016 case NETDEV_GOING_DOWN:
2022 case NETDEV_CHANGEMTU:
2023 if (netdev->features & NETIF_F_FCOE_MTU)
2025 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
2026 sizeof(struct fcoe_crc_eof));
2027 if (mfs >= FC_MIN_MAX_FRAME)
2028 fc_set_mfs(lport, mfs);
2030 case NETDEV_REGISTER:
2032 case NETDEV_UNREGISTER:
2033 list_del(&fcoe->list);
2034 port = lport_priv(ctlr->lp);
2035 queue_work(fcoe_wq, &port->destroy_work);
2038 case NETDEV_FEAT_CHANGE:
2039 fcoe_netdev_features_change(lport, netdev);
2042 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
2043 "from netdev netlink\n", event);
2046 fcoe_link_speed_update(lport);
2048 cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2050 if (link_possible && !fcoe_link_ok(lport)) {
2051 switch (cdev->enabled) {
2052 case FCOE_CTLR_DISABLED:
2053 pr_info("Link up while interface is disabled.\n");
2055 case FCOE_CTLR_ENABLED:
2056 case FCOE_CTLR_UNUSED:
2057 fcoe_ctlr_link_up(ctlr);
2059 } else if (fcoe_ctlr_link_down(ctlr)) {
2060 switch (cdev->enabled) {
2061 case FCOE_CTLR_DISABLED:
2062 pr_info("Link down while interface is disabled.\n");
2064 case FCOE_CTLR_ENABLED:
2065 case FCOE_CTLR_UNUSED:
2066 stats = per_cpu_ptr(lport->stats, get_cpu());
2067 stats->LinkFailureCount++;
2069 fcoe_clean_pending_queue(lport);
2077 * fcoe_disable() - Disables a FCoE interface
2078 * @netdev : The net_device object the Ethernet interface to create on
2080 * Called from fcoe transport.
2082 * Returns: 0 for success
2084 * Deprecated: use fcoe_ctlr_enabled()
2086 static int fcoe_disable(struct net_device *netdev)
2088 struct fcoe_ctlr *ctlr;
2089 struct fcoe_interface *fcoe;
2092 mutex_lock(&fcoe_config_mutex);
2095 fcoe = fcoe_hostlist_lookup_port(netdev);
2099 ctlr = fcoe_to_ctlr(fcoe);
2100 fcoe_ctlr_link_down(ctlr);
2101 fcoe_clean_pending_queue(ctlr->lp);
2105 mutex_unlock(&fcoe_config_mutex);
2110 * fcoe_enable() - Enables a FCoE interface
2111 * @netdev : The net_device object the Ethernet interface to create on
2113 * Called from fcoe transport.
2115 * Returns: 0 for success
2117 static int fcoe_enable(struct net_device *netdev)
2119 struct fcoe_ctlr *ctlr;
2120 struct fcoe_interface *fcoe;
2123 mutex_lock(&fcoe_config_mutex);
2125 fcoe = fcoe_hostlist_lookup_port(netdev);
2133 ctlr = fcoe_to_ctlr(fcoe);
2135 if (!fcoe_link_ok(ctlr->lp))
2136 fcoe_ctlr_link_up(ctlr);
2139 mutex_unlock(&fcoe_config_mutex);
2144 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
2145 * @cdev: The FCoE Controller that is being enabled or disabled
2147 * fcoe_sysfs will ensure that the state of 'enabled' has
2148 * changed, so no checking is necessary here. This routine simply
2149 * calls fcoe_enable or fcoe_disable, both of which are deprecated.
2150 * When those routines are removed the functionality can be merged
2153 static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
2155 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
2156 struct fc_lport *lport = ctlr->lp;
2157 struct net_device *netdev = fcoe_netdev(lport);
2159 switch (cdev->enabled) {
2160 case FCOE_CTLR_ENABLED:
2161 return fcoe_enable(netdev);
2162 case FCOE_CTLR_DISABLED:
2163 return fcoe_disable(netdev);
2164 case FCOE_CTLR_UNUSED:
2171 * fcoe_destroy() - Destroy a FCoE interface
2172 * @netdev : The net_device object the Ethernet interface to create on
2174 * Called from fcoe transport
2176 * Returns: 0 for success
2178 static int fcoe_destroy(struct net_device *netdev)
2180 struct fcoe_ctlr *ctlr;
2181 struct fcoe_interface *fcoe;
2182 struct fc_lport *lport;
2183 struct fcoe_port *port;
2186 mutex_lock(&fcoe_config_mutex);
2188 fcoe = fcoe_hostlist_lookup_port(netdev);
2193 ctlr = fcoe_to_ctlr(fcoe);
2195 port = lport_priv(lport);
2196 list_del(&fcoe->list);
2197 queue_work(fcoe_wq, &port->destroy_work);
2200 mutex_unlock(&fcoe_config_mutex);
2205 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2206 * @work: Handle to the FCoE port to be destroyed
2208 static void fcoe_destroy_work(struct work_struct *work)
2210 struct fcoe_ctlr_device *cdev;
2211 struct fcoe_ctlr *ctlr;
2212 struct fcoe_port *port;
2213 struct fcoe_interface *fcoe;
2214 struct Scsi_Host *shost;
2215 struct fc_host_attrs *fc_host;
2216 unsigned long flags;
2217 struct fc_vport *vport;
2218 struct fc_vport *next_vport;
2220 port = container_of(work, struct fcoe_port, destroy_work);
2221 shost = port->lport->host;
2222 fc_host = shost_to_fc_host(shost);
2224 /* Loop through all the vports and mark them for deletion */
2225 spin_lock_irqsave(shost->host_lock, flags);
2226 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2227 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
2230 vport->flags |= FC_VPORT_DELETING;
2231 queue_work(fc_host_work_q(shost),
2232 &vport->vport_delete_work);
2235 spin_unlock_irqrestore(shost->host_lock, flags);
2237 flush_workqueue(fc_host_work_q(shost));
2239 mutex_lock(&fcoe_config_mutex);
2242 ctlr = fcoe_to_ctlr(fcoe);
2243 cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2245 fcoe_if_destroy(port->lport);
2246 fcoe_interface_cleanup(fcoe);
2248 mutex_unlock(&fcoe_config_mutex);
2250 fcoe_ctlr_device_delete(cdev);
2254 * fcoe_match() - Check if the FCoE is supported on the given netdevice
2255 * @netdev : The net_device object the Ethernet interface to create on
2257 * Called from fcoe transport.
2259 * Returns: always returns true as this is the default FCoE transport,
2260 * i.e., support all netdevs.
2262 static bool fcoe_match(struct net_device *netdev)
2268 * fcoe_dcb_create() - Initialize DCB attributes and hooks
2269 * @netdev: The net_device object of the L2 link that should be queried
2270 * @port: The fcoe_port to bind FCoE APP priority with
2273 static void fcoe_dcb_create(struct fcoe_interface *fcoe)
2278 struct net_device *netdev = fcoe->realdev;
2279 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2280 struct dcb_app app = {
2282 .protocol = ETH_P_FCOE
2285 /* setup DCB priority attributes. */
2286 if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
2287 dcbx = netdev->dcbnl_ops->getdcbx(netdev);
2289 if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
2290 app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
2291 up = dcb_ieee_getapp_mask(netdev, &app);
2292 app.protocol = ETH_P_FIP;
2293 fup = dcb_ieee_getapp_mask(netdev, &app);
2295 app.selector = DCB_APP_IDTYPE_ETHTYPE;
2296 up = dcb_getapp(netdev, &app);
2297 app.protocol = ETH_P_FIP;
2298 fup = dcb_getapp(netdev, &app);
2301 fcoe->priority = ffs(up) ? ffs(up) - 1 : 0;
2302 ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority;
2307 enum fcoe_create_link_state {
2308 FCOE_CREATE_LINK_DOWN,
2309 FCOE_CREATE_LINK_UP,
2313 * _fcoe_create() - (internal) Create a fcoe interface
2314 * @netdev : The net_device object the Ethernet interface to create on
2315 * @fip_mode: The FIP mode for this creation
2316 * @link_state: The ctlr link state on creation
2318 * Called from either the libfcoe 'create' module parameter
2319 * via fcoe_create or from fcoe_syfs's ctlr_create file.
2321 * libfcoe's 'create' module parameter is deprecated so some
2322 * consolidation of code can be done when that interface is
2325 static int _fcoe_create(struct net_device *netdev, enum fip_state fip_mode,
2326 enum fcoe_create_link_state link_state)
2329 struct fcoe_ctlr_device *ctlr_dev;
2330 struct fcoe_ctlr *ctlr;
2331 struct fcoe_interface *fcoe;
2332 struct fc_lport *lport;
2334 mutex_lock(&fcoe_config_mutex);
2337 /* look for existing lport */
2338 if (fcoe_hostlist_lookup(netdev)) {
2343 fcoe = fcoe_interface_create(netdev, fip_mode);
2349 ctlr = fcoe_to_ctlr(fcoe);
2350 ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
2351 lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
2352 if (IS_ERR(lport)) {
2353 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2357 fcoe_interface_cleanup(fcoe);
2358 mutex_unlock(&fcoe_config_mutex);
2359 fcoe_ctlr_device_delete(ctlr_dev);
2363 /* Make this the "master" N_Port */
2366 /* setup DCB priority attributes. */
2367 fcoe_dcb_create(fcoe);
2369 /* start FIP Discovery and FLOGI */
2370 lport->boot_time = jiffies;
2371 fc_fabric_login(lport);
2374 * If the fcoe_ctlr_device is to be set to DISABLED
2375 * it must be done after the lport is added to the
2376 * hostlist, but before the rtnl_lock is released.
2377 * This is because the rtnl_lock protects the
2378 * hostlist that fcoe_device_notification uses. If
2379 * the FCoE Controller is intended to be created
2380 * DISABLED then 'enabled' needs to be considered
2381 * handling link events. 'enabled' must be set
2382 * before the lport can be found in the hostlist
2383 * when a link up event is received.
2385 if (link_state == FCOE_CREATE_LINK_UP)
2386 ctlr_dev->enabled = FCOE_CTLR_ENABLED;
2388 ctlr_dev->enabled = FCOE_CTLR_DISABLED;
2390 if (link_state == FCOE_CREATE_LINK_UP &&
2391 !fcoe_link_ok(lport)) {
2393 fcoe_ctlr_link_up(ctlr);
2394 mutex_unlock(&fcoe_config_mutex);
2400 mutex_unlock(&fcoe_config_mutex);
2406 * fcoe_create() - Create a fcoe interface
2407 * @netdev : The net_device object the Ethernet interface to create on
2408 * @fip_mode: The FIP mode for this creation
2410 * Called from fcoe transport
2412 * Returns: 0 for success
2414 static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
2416 return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
2420 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
2421 * @netdev: The net_device to be used by the allocated FCoE Controller
2423 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
2424 * in a link_down state. The allows the user an opportunity to configure
2425 * the FCoE Controller from sysfs before enabling the FCoE Controller.
2427 * Creating in with this routine starts the FCoE Controller in Fabric
2428 * mode. The user can change to VN2VN or another mode before enabling.
2430 static int fcoe_ctlr_alloc(struct net_device *netdev)
2432 return _fcoe_create(netdev, FIP_MODE_FABRIC,
2433 FCOE_CREATE_LINK_DOWN);
2437 * fcoe_link_ok() - Check if the link is OK for a local port
2438 * @lport: The local port to check link on
2440 * Returns: 0 if link is UP and OK, -1 if not
2443 static int fcoe_link_ok(struct fc_lport *lport)
2445 struct net_device *netdev = fcoe_netdev(lport);
2447 if (netif_oper_up(netdev))
2453 * fcoe_percpu_clean() - Clear all pending skbs for an local port
2454 * @lport: The local port whose skbs are to be cleared
2456 * Must be called with fcoe_create_mutex held to single-thread completion.
2458 * This flushes the pending skbs by adding a new skb to each queue and
2459 * waiting until they are all freed. This assures us that not only are
2460 * there no packets that will be handled by the lport, but also that any
2461 * threads already handling packet have returned.
2463 static void fcoe_percpu_clean(struct fc_lport *lport)
2465 struct fcoe_percpu_s *pp;
2466 struct sk_buff *skb;
2469 for_each_possible_cpu(cpu) {
2470 pp = &per_cpu(fcoe_percpu, cpu);
2472 if (!pp->thread || !cpu_online(cpu))
2475 skb = dev_alloc_skb(0);
2479 skb->destructor = fcoe_percpu_flush_done;
2481 spin_lock_bh(&pp->fcoe_rx_list.lock);
2482 __skb_queue_tail(&pp->fcoe_rx_list, skb);
2483 if (pp->fcoe_rx_list.qlen == 1)
2484 wake_up_process(pp->thread);
2485 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2487 wait_for_completion(&fcoe_flush_completion);
2492 * fcoe_reset() - Reset a local port
2493 * @shost: The SCSI host associated with the local port to be reset
2495 * Returns: Always 0 (return value required by FC transport template)
2497 static int fcoe_reset(struct Scsi_Host *shost)
2499 struct fc_lport *lport = shost_priv(shost);
2500 struct fcoe_port *port = lport_priv(lport);
2501 struct fcoe_interface *fcoe = port->priv;
2502 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2503 struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);
2505 fcoe_ctlr_link_down(ctlr);
2506 fcoe_clean_pending_queue(ctlr->lp);
2508 if (cdev->enabled != FCOE_CTLR_DISABLED &&
2509 !fcoe_link_ok(ctlr->lp))
2510 fcoe_ctlr_link_up(ctlr);
2515 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2516 * @netdev: The net device used as a key
2518 * Locking: Must be called with the RNL mutex held.
2520 * Returns: NULL or the FCoE interface
2522 static struct fcoe_interface *
2523 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2525 struct fcoe_interface *fcoe;
2527 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2528 if (fcoe->netdev == netdev)
2535 * fcoe_hostlist_lookup() - Find the local port associated with a
2537 * @netdev: The netdevice used as a key
2539 * Locking: Must be called with the RTNL mutex held
2541 * Returns: NULL or the local port
2543 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2545 struct fcoe_ctlr *ctlr;
2546 struct fcoe_interface *fcoe;
2548 fcoe = fcoe_hostlist_lookup_port(netdev);
2549 ctlr = fcoe_to_ctlr(fcoe);
2550 return (fcoe) ? ctlr->lp : NULL;
2554 * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2555 * port to the hostlist
2556 * @lport: The local port that identifies the FCoE interface to be added
2558 * Locking: must be called with the RTNL mutex held
2560 * Returns: 0 for success
2562 static int fcoe_hostlist_add(const struct fc_lport *lport)
2564 struct fcoe_interface *fcoe;
2565 struct fcoe_port *port;
2567 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2569 port = lport_priv(lport);
2571 list_add_tail(&fcoe->list, &fcoe_hostlist);
2577 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
2578 * port to the hostlist
2579 * @lport: The local port that identifies the FCoE interface to be added
2581 * Locking: must be called with the RTNL mutex held
2584 static void fcoe_hostlist_del(const struct fc_lport *lport)
2586 struct fcoe_interface *fcoe;
2587 struct fcoe_port *port;
2589 port = lport_priv(lport);
2591 list_del(&fcoe->list);
2595 static struct fcoe_transport fcoe_sw_transport = {
2596 .name = {FCOE_TRANSPORT_DEFAULT},
2598 .list = LIST_HEAD_INIT(fcoe_sw_transport.list),
2599 .match = fcoe_match,
2600 .alloc = fcoe_ctlr_alloc,
2601 .create = fcoe_create,
2602 .destroy = fcoe_destroy,
2603 .enable = fcoe_enable,
2604 .disable = fcoe_disable,
2608 * fcoe_init() - Initialize fcoe.ko
2610 * Returns: 0 on success, or a negative value on failure
2612 static int __init fcoe_init(void)
2614 struct fcoe_percpu_s *p;
2618 fcoe_wq = alloc_workqueue("fcoe", 0, 0);
2622 /* register as a fcoe transport */
2623 rc = fcoe_transport_attach(&fcoe_sw_transport);
2625 printk(KERN_ERR "failed to register an fcoe transport, check "
2626 "if libfcoe is loaded\n");
2630 mutex_lock(&fcoe_config_mutex);
2632 for_each_possible_cpu(cpu) {
2633 p = &per_cpu(fcoe_percpu, cpu);
2634 skb_queue_head_init(&p->fcoe_rx_list);
2637 cpu_notifier_register_begin();
2639 for_each_online_cpu(cpu)
2640 fcoe_percpu_thread_create(cpu);
2642 /* Initialize per CPU interrupt thread */
2643 rc = __register_hotcpu_notifier(&fcoe_cpu_notifier);
2647 cpu_notifier_register_done();
2649 /* Setup link change notification */
2652 rc = fcoe_if_init();
2656 mutex_unlock(&fcoe_config_mutex);
2660 for_each_online_cpu(cpu) {
2661 fcoe_percpu_thread_destroy(cpu);
2664 cpu_notifier_register_done();
2666 mutex_unlock(&fcoe_config_mutex);
2667 destroy_workqueue(fcoe_wq);
2670 module_init(fcoe_init);
2673 * fcoe_exit() - Clean up fcoe.ko
2675 * Returns: 0 on success or a negative value on failure
2677 static void __exit fcoe_exit(void)
2679 struct fcoe_interface *fcoe, *tmp;
2680 struct fcoe_ctlr *ctlr;
2681 struct fcoe_port *port;
2684 mutex_lock(&fcoe_config_mutex);
2688 /* releases the associated fcoe hosts */
2690 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2691 ctlr = fcoe_to_ctlr(fcoe);
2692 port = lport_priv(ctlr->lp);
2693 fcoe_hostlist_del(port->lport);
2694 queue_work(fcoe_wq, &port->destroy_work);
2698 cpu_notifier_register_begin();
2700 for_each_online_cpu(cpu)
2701 fcoe_percpu_thread_destroy(cpu);
2703 __unregister_hotcpu_notifier(&fcoe_cpu_notifier);
2705 cpu_notifier_register_done();
2707 mutex_unlock(&fcoe_config_mutex);
2710 * destroy_work's may be chained but destroy_workqueue()
2711 * can take care of them. Just kill the fcoe_wq.
2713 destroy_workqueue(fcoe_wq);
2716 * Detaching from the scsi transport must happen after all
2717 * destroys are done on the fcoe_wq. destroy_workqueue will
2718 * enusre the fcoe_wq is flushed.
2722 /* detach from fcoe transport */
2723 fcoe_transport_detach(&fcoe_sw_transport);
2725 module_exit(fcoe_exit);
2728 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2729 * @seq: active sequence in the FLOGI or FDISC exchange
2730 * @fp: response frame, or error encoded in a pointer (timeout)
2731 * @arg: pointer the the fcoe_ctlr structure
2733 * This handles MAC address management for FCoE, then passes control on to
2734 * the libfc FLOGI response handler.
2736 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2738 struct fcoe_ctlr *fip = arg;
2739 struct fc_exch *exch = fc_seq_exch(seq);
2740 struct fc_lport *lport = exch->lp;
2746 mac = fr_cb(fp)->granted_mac;
2748 if (is_zero_ether_addr(mac))
2749 fcoe_ctlr_recv_flogi(fip, lport, fp);
2750 if (!is_zero_ether_addr(mac))
2751 fcoe_update_src_mac(lport, mac);
2753 fc_lport_flogi_resp(seq, fp, lport);
2757 * fcoe_logo_resp() - FCoE specific LOGO response handler
2758 * @seq: active sequence in the LOGO exchange
2759 * @fp: response frame, or error encoded in a pointer (timeout)
2760 * @arg: pointer the the fcoe_ctlr structure
2762 * This handles MAC address management for FCoE, then passes control on to
2763 * the libfc LOGO response handler.
2765 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2767 struct fc_lport *lport = arg;
2768 static u8 zero_mac[ETH_ALEN] = { 0 };
2771 fcoe_update_src_mac(lport, zero_mac);
2772 fc_lport_logo_resp(seq, fp, lport);
2776 * fcoe_elsct_send - FCoE specific ELS handler
2778 * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2779 * using FCoE specific response handlers and passing the FIP controller as
2780 * the argument (the lport is still available from the exchange).
2782 * Most of the work here is just handed off to the libfc routine.
2784 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2785 struct fc_frame *fp, unsigned int op,
2786 void (*resp)(struct fc_seq *,
2789 void *arg, u32 timeout)
2791 struct fcoe_port *port = lport_priv(lport);
2792 struct fcoe_interface *fcoe = port->priv;
2793 struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
2794 struct fc_frame_header *fh = fc_frame_header_get(fp);
2799 if (lport->point_to_multipoint)
2801 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2804 /* only hook onto fabric logouts, not port logouts */
2805 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2807 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2810 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2814 * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2815 * @vport: fc_vport object to create a new fc_host for
2816 * @disabled: start the new fc_host in a disabled state by default?
2818 * Returns: 0 for success
2820 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2822 struct Scsi_Host *shost = vport_to_shost(vport);
2823 struct fc_lport *n_port = shost_priv(shost);
2824 struct fcoe_port *port = lport_priv(n_port);
2825 struct fcoe_interface *fcoe = port->priv;
2826 struct net_device *netdev = fcoe->netdev;
2827 struct fc_lport *vn_port;
2831 rc = fcoe_validate_vport_create(vport);
2833 fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
2834 printk(KERN_ERR "fcoe: Failed to create vport, "
2835 "WWPN (0x%s) already exists\n",
2840 mutex_lock(&fcoe_config_mutex);
2842 vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2844 mutex_unlock(&fcoe_config_mutex);
2846 if (IS_ERR(vn_port)) {
2847 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2853 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2855 vn_port->boot_time = jiffies;
2856 fc_fabric_login(vn_port);
2857 fc_vport_setlink(vn_port);
2863 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2864 * @vport: fc_vport object that is being destroyed
2866 * Returns: 0 for success
2868 static int fcoe_vport_destroy(struct fc_vport *vport)
2870 struct Scsi_Host *shost = vport_to_shost(vport);
2871 struct fc_lport *n_port = shost_priv(shost);
2872 struct fc_lport *vn_port = vport->dd_data;
2874 mutex_lock(&n_port->lp_mutex);
2875 list_del(&vn_port->list);
2876 mutex_unlock(&n_port->lp_mutex);
2878 mutex_lock(&fcoe_config_mutex);
2879 fcoe_if_destroy(vn_port);
2880 mutex_unlock(&fcoe_config_mutex);
2886 * fcoe_vport_disable() - change vport state
2887 * @vport: vport to bring online/offline
2888 * @disable: should the vport be disabled?
2890 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2892 struct fc_lport *lport = vport->dd_data;
2895 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2896 fc_fabric_logoff(lport);
2898 lport->boot_time = jiffies;
2899 fc_fabric_login(lport);
2900 fc_vport_setlink(lport);
2907 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
2908 * @vport: fc_vport with a new symbolic name string
2910 * After generating a new symbolic name string, a new RSPN_ID request is
2911 * sent to the name server. There is no response handler, so if it fails
2912 * for some reason it will not be retried.
2914 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2916 struct fc_lport *lport = vport->dd_data;
2917 struct fc_frame *fp;
2920 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2921 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2922 fcoe_netdev(lport)->name, vport->symbolic_name);
2924 if (lport->state != LPORT_ST_READY)
2927 len = strnlen(fc_host_symbolic_name(lport->host), 255);
2928 fp = fc_frame_alloc(lport,
2929 sizeof(struct fc_ct_hdr) +
2930 sizeof(struct fc_ns_rspn) + len);
2933 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2934 NULL, NULL, 3 * lport->r_a_tov);
2937 static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
2939 struct fcoe_ctlr_device *ctlr_dev =
2940 fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
2941 struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
2942 struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);
2944 fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
2948 * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2949 * @lport: the local port
2950 * @port_id: the port ID
2951 * @fp: the received frame, if any, that caused the port_id to be set.
2953 * This routine handles the case where we received a FLOGI and are
2954 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi()
2955 * so it can set the non-mapped mode and gateway address.
2957 * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2959 static void fcoe_set_port_id(struct fc_lport *lport,
2960 u32 port_id, struct fc_frame *fp)
2962 struct fcoe_port *port = lport_priv(lport);
2963 struct fcoe_interface *fcoe = port->priv;
2964 struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
2966 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2967 fcoe_ctlr_recv_flogi(ctlr, lport, fp);