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/version.h>
22 #include <linux/spinlock.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/ethtool.h>
26 #include <linux/if_ether.h>
27 #include <linux/if_vlan.h>
28 #include <linux/crc32.h>
29 #include <linux/slab.h>
30 #include <linux/cpu.h>
32 #include <linux/sysfs.h>
33 #include <linux/ctype.h>
34 #include <scsi/scsi_tcq.h>
35 #include <scsi/scsicam.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_fc.h>
38 #include <net/rtnetlink.h>
40 #include <scsi/fc/fc_encaps.h>
41 #include <scsi/fc/fc_fip.h>
43 #include <scsi/libfc.h>
44 #include <scsi/fc_frame.h>
45 #include <scsi/libfcoe.h>
49 MODULE_AUTHOR("Open-FCoE.org");
50 MODULE_DESCRIPTION("FCoE");
51 MODULE_LICENSE("GPL v2");
53 /* Performance tuning parameters for fcoe */
54 static unsigned int fcoe_ddp_min;
55 module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
56 MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
57 "Direct Data Placement (DDP).");
59 DEFINE_MUTEX(fcoe_config_mutex);
61 /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */
62 static DECLARE_COMPLETION(fcoe_flush_completion);
65 /* must only by accessed under the RTNL mutex */
66 LIST_HEAD(fcoe_hostlist);
67 DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
69 /* Function Prototypes */
70 static int fcoe_reset(struct Scsi_Host *);
71 static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
72 static int fcoe_rcv(struct sk_buff *, struct net_device *,
73 struct packet_type *, struct net_device *);
74 static int fcoe_percpu_receive_thread(void *);
75 static void fcoe_clean_pending_queue(struct fc_lport *);
76 static void fcoe_percpu_clean(struct fc_lport *);
77 static int fcoe_link_speed_update(struct fc_lport *);
78 static int fcoe_link_ok(struct fc_lport *);
80 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
81 static int fcoe_hostlist_add(const struct fc_lport *);
83 static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
84 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
85 static void fcoe_dev_setup(void);
86 static void fcoe_dev_cleanup(void);
87 static struct fcoe_interface
88 *fcoe_hostlist_lookup_port(const struct net_device *);
90 static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
91 struct packet_type *, struct net_device *);
93 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
94 static void fcoe_update_src_mac(struct fc_lport *, u8 *);
95 static u8 *fcoe_get_src_mac(struct fc_lport *);
96 static void fcoe_destroy_work(struct work_struct *);
98 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
100 static int fcoe_ddp_done(struct fc_lport *, u16);
102 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
104 static int fcoe_create(const char *, struct kernel_param *);
105 static int fcoe_destroy(const char *, struct kernel_param *);
106 static int fcoe_enable(const char *, struct kernel_param *);
107 static int fcoe_disable(const char *, struct kernel_param *);
109 static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
110 u32 did, struct fc_frame *,
112 void (*resp)(struct fc_seq *,
115 void *, u32 timeout);
116 static void fcoe_recv_frame(struct sk_buff *skb);
118 static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
120 module_param_call(create, fcoe_create, NULL, (void *)FIP_MODE_FABRIC, S_IWUSR);
121 __MODULE_PARM_TYPE(create, "string");
122 MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface");
123 module_param_call(create_vn2vn, fcoe_create, NULL,
124 (void *)FIP_MODE_VN2VN, S_IWUSR);
125 __MODULE_PARM_TYPE(create_vn2vn, "string");
126 MODULE_PARM_DESC(create_vn2vn, " Creates a VN_node to VN_node FCoE instance "
127 "on an Ethernet interface");
128 module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
129 __MODULE_PARM_TYPE(destroy, "string");
130 MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface");
131 module_param_call(enable, fcoe_enable, NULL, NULL, S_IWUSR);
132 __MODULE_PARM_TYPE(enable, "string");
133 MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface.");
134 module_param_call(disable, fcoe_disable, NULL, NULL, S_IWUSR);
135 __MODULE_PARM_TYPE(disable, "string");
136 MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");
138 /* notification function for packets from net device */
139 static struct notifier_block fcoe_notifier = {
140 .notifier_call = fcoe_device_notification,
143 /* notification function for CPU hotplug events */
144 static struct notifier_block fcoe_cpu_notifier = {
145 .notifier_call = fcoe_cpu_callback,
148 static struct scsi_transport_template *fcoe_transport_template;
149 static struct scsi_transport_template *fcoe_vport_transport_template;
151 static int fcoe_vport_destroy(struct fc_vport *);
152 static int fcoe_vport_create(struct fc_vport *, bool disabled);
153 static int fcoe_vport_disable(struct fc_vport *, bool disable);
154 static void fcoe_set_vport_symbolic_name(struct fc_vport *);
155 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
157 static struct libfc_function_template fcoe_libfc_fcn_templ = {
158 .frame_send = fcoe_xmit,
159 .ddp_setup = fcoe_ddp_setup,
160 .ddp_done = fcoe_ddp_done,
161 .elsct_send = fcoe_elsct_send,
162 .get_lesb = fcoe_get_lesb,
163 .lport_set_port_id = fcoe_set_port_id,
166 struct fc_function_template fcoe_transport_function = {
167 .show_host_node_name = 1,
168 .show_host_port_name = 1,
169 .show_host_supported_classes = 1,
170 .show_host_supported_fc4s = 1,
171 .show_host_active_fc4s = 1,
172 .show_host_maxframe_size = 1,
174 .show_host_port_id = 1,
175 .show_host_supported_speeds = 1,
176 .get_host_speed = fc_get_host_speed,
177 .show_host_speed = 1,
178 .show_host_port_type = 1,
179 .get_host_port_state = fc_get_host_port_state,
180 .show_host_port_state = 1,
181 .show_host_symbolic_name = 1,
183 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
184 .show_rport_maxframe_size = 1,
185 .show_rport_supported_classes = 1,
187 .show_host_fabric_name = 1,
188 .show_starget_node_name = 1,
189 .show_starget_port_name = 1,
190 .show_starget_port_id = 1,
191 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
192 .show_rport_dev_loss_tmo = 1,
193 .get_fc_host_stats = fc_get_host_stats,
194 .issue_fc_host_lip = fcoe_reset,
196 .terminate_rport_io = fc_rport_terminate_io,
198 .vport_create = fcoe_vport_create,
199 .vport_delete = fcoe_vport_destroy,
200 .vport_disable = fcoe_vport_disable,
201 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
203 .bsg_request = fc_lport_bsg_request,
206 struct fc_function_template fcoe_vport_transport_function = {
207 .show_host_node_name = 1,
208 .show_host_port_name = 1,
209 .show_host_supported_classes = 1,
210 .show_host_supported_fc4s = 1,
211 .show_host_active_fc4s = 1,
212 .show_host_maxframe_size = 1,
214 .show_host_port_id = 1,
215 .show_host_supported_speeds = 1,
216 .get_host_speed = fc_get_host_speed,
217 .show_host_speed = 1,
218 .show_host_port_type = 1,
219 .get_host_port_state = fc_get_host_port_state,
220 .show_host_port_state = 1,
221 .show_host_symbolic_name = 1,
223 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
224 .show_rport_maxframe_size = 1,
225 .show_rport_supported_classes = 1,
227 .show_host_fabric_name = 1,
228 .show_starget_node_name = 1,
229 .show_starget_port_name = 1,
230 .show_starget_port_id = 1,
231 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
232 .show_rport_dev_loss_tmo = 1,
233 .get_fc_host_stats = fc_get_host_stats,
234 .issue_fc_host_lip = fcoe_reset,
236 .terminate_rport_io = fc_rport_terminate_io,
238 .bsg_request = fc_lport_bsg_request,
241 static struct scsi_host_template fcoe_shost_template = {
242 .module = THIS_MODULE,
243 .name = "FCoE Driver",
244 .proc_name = FCOE_NAME,
245 .queuecommand = fc_queuecommand,
246 .eh_abort_handler = fc_eh_abort,
247 .eh_device_reset_handler = fc_eh_device_reset,
248 .eh_host_reset_handler = fc_eh_host_reset,
249 .slave_alloc = fc_slave_alloc,
250 .change_queue_depth = fc_change_queue_depth,
251 .change_queue_type = fc_change_queue_type,
254 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
255 .use_clustering = ENABLE_CLUSTERING,
256 .sg_tablesize = SG_ALL,
257 .max_sectors = 0xffff,
261 * fcoe_interface_setup() - Setup a FCoE interface
262 * @fcoe: The new FCoE interface
263 * @netdev: The net device that the fcoe interface is on
265 * Returns : 0 for success
266 * Locking: must be called with the RTNL mutex held
268 static int fcoe_interface_setup(struct fcoe_interface *fcoe,
269 struct net_device *netdev)
271 struct fcoe_ctlr *fip = &fcoe->ctlr;
272 struct netdev_hw_addr *ha;
273 struct net_device *real_dev;
274 u8 flogi_maddr[ETH_ALEN];
275 const struct net_device_ops *ops;
277 fcoe->netdev = netdev;
279 /* Let LLD initialize for FCoE */
280 ops = netdev->netdev_ops;
281 if (ops->ndo_fcoe_enable) {
282 if (ops->ndo_fcoe_enable(netdev))
283 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
284 " specific feature for LLD.\n");
287 /* Do not support for bonding device */
288 if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) {
289 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
293 /* look for SAN MAC address, if multiple SAN MACs exist, only
294 * use the first one for SPMA */
295 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
296 vlan_dev_real_dev(netdev) : netdev;
298 for_each_dev_addr(real_dev, ha) {
299 if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
300 (is_valid_ether_addr(ha->addr))) {
301 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
308 /* setup Source Mac Address */
310 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
313 * Add FCoE MAC address as second unicast MAC address
314 * or enter promiscuous mode if not capable of listening
315 * for multiple unicast MACs.
317 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
318 dev_uc_add(netdev, flogi_maddr);
320 dev_uc_add(netdev, fip->ctl_src_addr);
321 if (fip->mode == FIP_MODE_VN2VN) {
322 dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
323 dev_mc_add(netdev, FIP_ALL_P2P_MACS);
325 dev_mc_add(netdev, FIP_ALL_ENODE_MACS);
328 * setup the receive function from ethernet driver
329 * on the ethertype for the given device
331 fcoe->fcoe_packet_type.func = fcoe_rcv;
332 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
333 fcoe->fcoe_packet_type.dev = netdev;
334 dev_add_pack(&fcoe->fcoe_packet_type);
336 fcoe->fip_packet_type.func = fcoe_fip_recv;
337 fcoe->fip_packet_type.type = htons(ETH_P_FIP);
338 fcoe->fip_packet_type.dev = netdev;
339 dev_add_pack(&fcoe->fip_packet_type);
345 * fcoe_interface_create() - Create a FCoE interface on a net device
346 * @netdev: The net device to create the FCoE interface on
347 * @fip_mode: The mode to use for FIP
349 * Returns: pointer to a struct fcoe_interface or NULL on error
351 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
352 enum fip_state fip_mode)
354 struct fcoe_interface *fcoe;
357 fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL);
359 FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n");
364 kref_init(&fcoe->kref);
369 fcoe_ctlr_init(&fcoe->ctlr, fip_mode);
370 fcoe->ctlr.send = fcoe_fip_send;
371 fcoe->ctlr.update_mac = fcoe_update_src_mac;
372 fcoe->ctlr.get_src_addr = fcoe_get_src_mac;
374 err = fcoe_interface_setup(fcoe, netdev);
376 fcoe_ctlr_destroy(&fcoe->ctlr);
386 * fcoe_interface_cleanup() - Clean up a FCoE interface
387 * @fcoe: The FCoE interface to be cleaned up
389 * Caller must be holding the RTNL mutex
391 void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
393 struct net_device *netdev = fcoe->netdev;
394 struct fcoe_ctlr *fip = &fcoe->ctlr;
395 u8 flogi_maddr[ETH_ALEN];
396 const struct net_device_ops *ops;
399 * Don't listen for Ethernet packets anymore.
400 * synchronize_net() ensures that the packet handlers are not running
401 * on another CPU. dev_remove_pack() would do that, this calls the
402 * unsyncronized version __dev_remove_pack() to avoid multiple delays.
404 __dev_remove_pack(&fcoe->fcoe_packet_type);
405 __dev_remove_pack(&fcoe->fip_packet_type);
408 /* Delete secondary MAC addresses */
409 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
410 dev_uc_del(netdev, flogi_maddr);
412 dev_uc_del(netdev, fip->ctl_src_addr);
413 if (fip->mode == FIP_MODE_VN2VN) {
414 dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
415 dev_mc_del(netdev, FIP_ALL_P2P_MACS);
417 dev_mc_del(netdev, FIP_ALL_ENODE_MACS);
419 /* Tell the LLD we are done w/ FCoE */
420 ops = netdev->netdev_ops;
421 if (ops->ndo_fcoe_disable) {
422 if (ops->ndo_fcoe_disable(netdev))
423 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
424 " specific feature for LLD.\n");
429 * fcoe_interface_release() - fcoe_port kref release function
430 * @kref: Embedded reference count in an fcoe_interface struct
432 static void fcoe_interface_release(struct kref *kref)
434 struct fcoe_interface *fcoe;
435 struct net_device *netdev;
437 fcoe = container_of(kref, struct fcoe_interface, kref);
438 netdev = fcoe->netdev;
439 /* tear-down the FCoE controller */
440 fcoe_ctlr_destroy(&fcoe->ctlr);
446 * fcoe_interface_get() - Get a reference to a FCoE interface
447 * @fcoe: The FCoE interface to be held
449 static inline void fcoe_interface_get(struct fcoe_interface *fcoe)
451 kref_get(&fcoe->kref);
455 * fcoe_interface_put() - Put a reference to a FCoE interface
456 * @fcoe: The FCoE interface to be released
458 static inline void fcoe_interface_put(struct fcoe_interface *fcoe)
460 kref_put(&fcoe->kref, fcoe_interface_release);
464 * fcoe_fip_recv() - Handler for received FIP frames
465 * @skb: The receive skb
466 * @netdev: The associated net device
467 * @ptype: The packet_type structure which was used to register this handler
468 * @orig_dev: The original net_device the the skb was received on.
469 * (in case dev is a bond)
471 * Returns: 0 for success
473 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
474 struct packet_type *ptype,
475 struct net_device *orig_dev)
477 struct fcoe_interface *fcoe;
479 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
480 fcoe_ctlr_recv(&fcoe->ctlr, skb);
485 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
486 * @fip: The FCoE controller
487 * @skb: The FIP packet to be sent
489 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
491 skb->dev = fcoe_from_ctlr(fip)->netdev;
496 * fcoe_update_src_mac() - Update the Ethernet MAC filters
497 * @lport: The local port to update the source MAC on
498 * @addr: Unicast MAC address to add
500 * Remove any previously-set unicast MAC filter.
501 * Add secondary FCoE MAC address filter for our OUI.
503 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
505 struct fcoe_port *port = lport_priv(lport);
506 struct fcoe_interface *fcoe = port->fcoe;
509 if (!is_zero_ether_addr(port->data_src_addr))
510 dev_uc_del(fcoe->netdev, port->data_src_addr);
511 if (!is_zero_ether_addr(addr))
512 dev_uc_add(fcoe->netdev, addr);
513 memcpy(port->data_src_addr, addr, ETH_ALEN);
518 * fcoe_get_src_mac() - return the Ethernet source address for an lport
519 * @lport: libfc lport
521 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
523 struct fcoe_port *port = lport_priv(lport);
525 return port->data_src_addr;
529 * fcoe_lport_config() - Set up a local port
530 * @lport: The local port to be setup
532 * Returns: 0 for success
534 static int fcoe_lport_config(struct fc_lport *lport)
538 lport->max_retry_count = 3;
539 lport->max_rport_retry_count = 3;
540 lport->e_d_tov = 2 * 1000; /* FC-FS default */
541 lport->r_a_tov = 2 * 2 * 1000;
542 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
543 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
544 lport->does_npiv = 1;
546 fc_lport_init_stats(lport);
548 /* lport fc_lport related configuration */
549 fc_lport_config(lport);
551 /* offload related configuration */
552 lport->crc_offload = 0;
553 lport->seq_offload = 0;
554 lport->lro_enabled = 0;
562 * fcoe_queue_timer() - The fcoe queue timer
563 * @lport: The local port
565 * Calls fcoe_check_wait_queue on timeout
567 static void fcoe_queue_timer(ulong lport)
569 fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
573 * fcoe_get_wwn() - Get the world wide name from LLD if it supports it
574 * @netdev: the associated net device
575 * @wwn: the output WWN
576 * @type: the type of WWN (WWPN or WWNN)
578 * Returns: 0 for success
580 static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
582 const struct net_device_ops *ops = netdev->netdev_ops;
584 if (ops->ndo_fcoe_get_wwn)
585 return ops->ndo_fcoe_get_wwn(netdev, wwn, type);
590 * fcoe_netdev_features_change - Updates the lport's offload flags based
591 * on the LLD netdev's FCoE feature flags
593 static void fcoe_netdev_features_change(struct fc_lport *lport,
594 struct net_device *netdev)
596 mutex_lock(&lport->lp_mutex);
598 if (netdev->features & NETIF_F_SG)
603 if (netdev->features & NETIF_F_FCOE_CRC) {
604 lport->crc_offload = 1;
605 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
607 lport->crc_offload = 0;
610 if (netdev->features & NETIF_F_FSO) {
611 lport->seq_offload = 1;
612 lport->lso_max = netdev->gso_max_size;
613 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
616 lport->seq_offload = 0;
620 if (netdev->fcoe_ddp_xid) {
621 lport->lro_enabled = 1;
622 lport->lro_xid = netdev->fcoe_ddp_xid;
623 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
626 lport->lro_enabled = 0;
630 mutex_unlock(&lport->lp_mutex);
634 * fcoe_netdev_config() - Set up net devive for SW FCoE
635 * @lport: The local port that is associated with the net device
636 * @netdev: The associated net device
638 * Must be called after fcoe_lport_config() as it will use local port mutex
640 * Returns: 0 for success
642 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
646 struct fcoe_interface *fcoe;
647 struct fcoe_port *port;
649 /* Setup lport private data to point to fcoe softc */
650 port = lport_priv(lport);
654 * Determine max frame size based on underlying device and optional
655 * user-configured limit. If the MFS is too low, fcoe_link_ok()
656 * will return 0, so do this first.
659 if (netdev->features & NETIF_F_FCOE_MTU) {
661 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
663 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
664 if (fc_set_mfs(lport, mfs))
667 /* offload features support */
668 fcoe_netdev_features_change(lport, netdev);
670 skb_queue_head_init(&port->fcoe_pending_queue);
671 port->fcoe_pending_queue_active = 0;
672 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
674 fcoe_link_speed_update(lport);
677 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
678 wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0);
679 fc_set_wwnn(lport, wwnn);
680 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
681 wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr,
683 fc_set_wwpn(lport, wwpn);
690 * fcoe_shost_config() - Set up the SCSI host associated with a local port
691 * @lport: The local port
692 * @dev: The device associated with the SCSI host
694 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
696 * Returns: 0 for success
698 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
702 /* lport scsi host config */
703 lport->host->max_lun = FCOE_MAX_LUN;
704 lport->host->max_id = FCOE_MAX_FCP_TARGET;
705 lport->host->max_channel = 0;
706 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
709 lport->host->transportt = fcoe_vport_transport_template;
711 lport->host->transportt = fcoe_transport_template;
713 /* add the new host to the SCSI-ml */
714 rc = scsi_add_host(lport->host, dev);
716 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
717 "error on scsi_add_host\n");
722 fc_host_max_npiv_vports(lport->host) = USHRT_MAX;
724 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
725 "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
726 fcoe_netdev(lport)->name);
732 * fcoe_oem_match() - The match routine for the offloaded exchange manager
735 * This routine will be associated with an exchange manager (EM). When
736 * the libfc exchange handling code is looking for an EM to use it will
737 * call this routine and pass it the frame that it wishes to send. This
738 * routine will return True if the associated EM is to be used and False
739 * if the echange code should continue looking for an EM.
741 * The offload EM that this routine is associated with will handle any
742 * packets that are for SCSI read requests.
744 * Returns: True for read types I/O, otherwise returns false.
746 bool fcoe_oem_match(struct fc_frame *fp)
748 return fc_fcp_is_read(fr_fsp(fp)) &&
749 (fr_fsp(fp)->data_len > fcoe_ddp_min);
753 * fcoe_em_config() - Allocate and configure an exchange manager
754 * @lport: The local port that the new EM will be associated with
756 * Returns: 0 on success
758 static inline int fcoe_em_config(struct fc_lport *lport)
760 struct fcoe_port *port = lport_priv(lport);
761 struct fcoe_interface *fcoe = port->fcoe;
762 struct fcoe_interface *oldfcoe = NULL;
763 struct net_device *old_real_dev, *cur_real_dev;
764 u16 min_xid = FCOE_MIN_XID;
765 u16 max_xid = FCOE_MAX_XID;
768 * Check if need to allocate an em instance for
769 * offload exchange ids to be shared across all VN_PORTs/lport.
771 if (!lport->lro_enabled || !lport->lro_xid ||
772 (lport->lro_xid >= max_xid)) {
778 * Reuse existing offload em instance in case
779 * it is already allocated on real eth device
781 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
782 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
784 cur_real_dev = fcoe->netdev;
786 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
787 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
788 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
790 old_real_dev = oldfcoe->netdev;
792 if (cur_real_dev == old_real_dev) {
793 fcoe->oem = oldfcoe->oem;
799 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
800 printk(KERN_ERR "fcoe_em_config: failed to add "
801 "offload em:%p on interface:%s\n",
802 fcoe->oem, fcoe->netdev->name);
806 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
807 FCOE_MIN_XID, lport->lro_xid,
810 printk(KERN_ERR "fcoe_em_config: failed to allocate "
811 "em for offload exches on interface:%s\n",
818 * Exclude offload EM xid range from next EM xid range.
820 min_xid += lport->lro_xid + 1;
823 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
824 printk(KERN_ERR "fcoe_em_config: failed to "
825 "allocate em on interface %s\n", fcoe->netdev->name);
833 * fcoe_if_destroy() - Tear down a SW FCoE instance
834 * @lport: The local port to be destroyed
836 * Locking: must be called with the RTNL mutex held and RTNL mutex
837 * needed to be dropped by this function since not dropping RTNL
838 * would cause circular locking warning on synchronous fip worker
839 * cancelling thru fcoe_interface_put invoked by this function.
842 static void fcoe_if_destroy(struct fc_lport *lport)
844 struct fcoe_port *port = lport_priv(lport);
845 struct fcoe_interface *fcoe = port->fcoe;
846 struct net_device *netdev = fcoe->netdev;
848 FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
850 /* Logout of the fabric */
851 fc_fabric_logoff(lport);
853 /* Cleanup the fc_lport */
854 fc_lport_destroy(lport);
856 /* Stop the transmit retry timer */
857 del_timer_sync(&port->timer);
859 /* Free existing transmit skbs */
860 fcoe_clean_pending_queue(lport);
862 if (!is_zero_ether_addr(port->data_src_addr))
863 dev_uc_del(netdev, port->data_src_addr);
866 /* receives may not be stopped until after this */
867 fcoe_interface_put(fcoe);
869 /* Free queued packets for the per-CPU receive threads */
870 fcoe_percpu_clean(lport);
872 /* Detach from the scsi-ml */
873 fc_remove_host(lport->host);
874 scsi_remove_host(lport->host);
876 /* Destroy lport scsi_priv */
877 fc_fcp_destroy(lport);
879 /* There are no more rports or I/O, free the EM */
880 fc_exch_mgr_free(lport);
882 /* Free memory used by statistical counters */
883 fc_lport_free_stats(lport);
885 /* Release the Scsi_Host */
886 scsi_host_put(lport->host);
887 module_put(THIS_MODULE);
891 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
892 * @lport: The local port to setup DDP for
893 * @xid: The exchange ID for this DDP transfer
894 * @sgl: The scatterlist describing this transfer
895 * @sgc: The number of sg items
897 * Returns: 0 if the DDP context was not configured
899 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
900 struct scatterlist *sgl, unsigned int sgc)
902 struct net_device *netdev = fcoe_netdev(lport);
904 if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
905 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
913 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
914 * @lport: The local port to complete DDP on
915 * @xid: The exchange ID for this DDP transfer
917 * Returns: the length of data that have been completed by DDP
919 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
921 struct net_device *netdev = fcoe_netdev(lport);
923 if (netdev->netdev_ops->ndo_fcoe_ddp_done)
924 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
929 * fcoe_if_create() - Create a FCoE instance on an interface
930 * @fcoe: The FCoE interface to create a local port on
931 * @parent: The device pointer to be the parent in sysfs for the SCSI host
932 * @npiv: Indicates if the port is a vport or not
934 * Creates a fc_lport instance and a Scsi_Host instance and configure them.
936 * Returns: The allocated fc_lport or an error pointer
938 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
939 struct device *parent, int npiv)
941 struct net_device *netdev = fcoe->netdev;
942 struct fc_lport *lport = NULL;
943 struct fcoe_port *port;
946 * parent is only a vport if npiv is 1,
947 * but we'll only use vport in that case so go ahead and set it
949 struct fc_vport *vport = dev_to_vport(parent);
951 FCOE_NETDEV_DBG(netdev, "Create Interface\n");
954 lport = libfc_host_alloc(&fcoe_shost_template,
955 sizeof(struct fcoe_port));
957 lport = libfc_vport_create(vport,
958 sizeof(struct fcoe_port));
961 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
965 port = lport_priv(lport);
968 INIT_WORK(&port->destroy_work, fcoe_destroy_work);
970 /* configure a fc_lport including the exchange manager */
971 rc = fcoe_lport_config(lport);
973 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
979 FCOE_NETDEV_DBG(netdev, "Setting vport names, "
980 "%16.16llx %16.16llx\n",
981 vport->node_name, vport->port_name);
982 fc_set_wwnn(lport, vport->node_name);
983 fc_set_wwpn(lport, vport->port_name);
986 /* configure lport network properties */
987 rc = fcoe_netdev_config(lport, netdev);
989 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
994 /* configure lport scsi host properties */
995 rc = fcoe_shost_config(lport, parent);
997 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
1002 /* Initialize the library */
1003 rc = fcoe_libfc_config(lport, &fcoe->ctlr, &fcoe_libfc_fcn_templ, 1);
1005 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
1007 goto out_lp_destroy;
1012 * fcoe_em_alloc() and fcoe_hostlist_add() both
1013 * need to be atomic with respect to other changes to the
1014 * hostlist since fcoe_em_alloc() looks for an existing EM
1015 * instance on host list updated by fcoe_hostlist_add().
1017 * This is currently handled through the fcoe_config_mutex
1021 /* lport exch manager allocation */
1022 rc = fcoe_em_config(lport);
1024 FCOE_NETDEV_DBG(netdev, "Could not configure the EM "
1025 "for the interface\n");
1026 goto out_lp_destroy;
1030 fcoe_interface_get(fcoe);
1034 fc_exch_mgr_free(lport);
1036 scsi_host_put(lport->host);
1042 * fcoe_if_init() - Initialization routine for fcoe.ko
1044 * Attaches the SW FCoE transport to the FC transport
1046 * Returns: 0 on success
1048 static int __init fcoe_if_init(void)
1050 /* attach to scsi transport */
1051 fcoe_transport_template = fc_attach_transport(&fcoe_transport_function);
1052 fcoe_vport_transport_template =
1053 fc_attach_transport(&fcoe_vport_transport_function);
1055 if (!fcoe_transport_template) {
1056 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1064 * fcoe_if_exit() - Tear down fcoe.ko
1066 * Detaches the SW FCoE transport from the FC transport
1068 * Returns: 0 on success
1070 int __exit fcoe_if_exit(void)
1072 fc_release_transport(fcoe_transport_template);
1073 fc_release_transport(fcoe_vport_transport_template);
1074 fcoe_transport_template = NULL;
1075 fcoe_vport_transport_template = NULL;
1080 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU
1081 * @cpu: The CPU index of the CPU to create a receive thread for
1083 static void fcoe_percpu_thread_create(unsigned int cpu)
1085 struct fcoe_percpu_s *p;
1086 struct task_struct *thread;
1088 p = &per_cpu(fcoe_percpu, cpu);
1090 thread = kthread_create(fcoe_percpu_receive_thread,
1091 (void *)p, "fcoethread/%d", cpu);
1093 if (likely(!IS_ERR(thread))) {
1094 kthread_bind(thread, cpu);
1095 wake_up_process(thread);
1097 spin_lock_bh(&p->fcoe_rx_list.lock);
1099 spin_unlock_bh(&p->fcoe_rx_list.lock);
1104 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
1105 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed
1107 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
1108 * current CPU's Rx thread. If the thread being destroyed is bound to
1109 * the CPU processing this context the skbs will be freed.
1111 static void fcoe_percpu_thread_destroy(unsigned int cpu)
1113 struct fcoe_percpu_s *p;
1114 struct task_struct *thread;
1115 struct page *crc_eof;
1116 struct sk_buff *skb;
1118 struct fcoe_percpu_s *p0;
1119 unsigned targ_cpu = get_cpu();
1120 #endif /* CONFIG_SMP */
1122 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
1124 /* Prevent any new skbs from being queued for this CPU. */
1125 p = &per_cpu(fcoe_percpu, cpu);
1126 spin_lock_bh(&p->fcoe_rx_list.lock);
1129 crc_eof = p->crc_eof_page;
1130 p->crc_eof_page = NULL;
1131 p->crc_eof_offset = 0;
1132 spin_unlock_bh(&p->fcoe_rx_list.lock);
1136 * Don't bother moving the skb's if this context is running
1137 * on the same CPU that is having its thread destroyed. This
1138 * can easily happen when the module is removed.
1140 if (cpu != targ_cpu) {
1141 p0 = &per_cpu(fcoe_percpu, targ_cpu);
1142 spin_lock_bh(&p0->fcoe_rx_list.lock);
1144 FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
1147 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1148 __skb_queue_tail(&p0->fcoe_rx_list, skb);
1149 spin_unlock_bh(&p0->fcoe_rx_list.lock);
1152 * The targeted CPU is not initialized and cannot accept
1153 * new skbs. Unlock the targeted CPU and drop the skbs
1154 * on the CPU that is going offline.
1156 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1158 spin_unlock_bh(&p0->fcoe_rx_list.lock);
1162 * This scenario occurs when the module is being removed
1163 * and all threads are being destroyed. skbs will continue
1164 * to be shifted from the CPU thread that is being removed
1165 * to the CPU thread associated with the CPU that is processing
1166 * the module removal. Once there is only one CPU Rx thread it
1167 * will reach this case and we will drop all skbs and later
1170 spin_lock_bh(&p->fcoe_rx_list.lock);
1171 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1173 spin_unlock_bh(&p->fcoe_rx_list.lock);
1178 * This a non-SMP scenario where the singular Rx thread is
1179 * being removed. Free all skbs and stop the thread.
1181 spin_lock_bh(&p->fcoe_rx_list.lock);
1182 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1184 spin_unlock_bh(&p->fcoe_rx_list.lock);
1188 kthread_stop(thread);
1195 * fcoe_cpu_callback() - Handler for CPU hotplug events
1196 * @nfb: The callback data block
1197 * @action: The event triggering the callback
1198 * @hcpu: The index of the CPU that the event is for
1200 * This creates or destroys per-CPU data for fcoe
1202 * Returns NOTIFY_OK always.
1204 static int fcoe_cpu_callback(struct notifier_block *nfb,
1205 unsigned long action, void *hcpu)
1207 unsigned cpu = (unsigned long)hcpu;
1211 case CPU_ONLINE_FROZEN:
1212 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
1213 fcoe_percpu_thread_create(cpu);
1216 case CPU_DEAD_FROZEN:
1217 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
1218 fcoe_percpu_thread_destroy(cpu);
1227 * fcoe_rcv() - Receive packets from a net device
1228 * @skb: The received packet
1229 * @netdev: The net device that the packet was received on
1230 * @ptype: The packet type context
1231 * @olddev: The last device net device
1233 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1234 * FC frame and passes the frame to libfc.
1236 * Returns: 0 for success
1238 int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1239 struct packet_type *ptype, struct net_device *olddev)
1241 struct fc_lport *lport;
1242 struct fcoe_rcv_info *fr;
1243 struct fcoe_interface *fcoe;
1244 struct fc_frame_header *fh;
1245 struct fcoe_percpu_s *fps;
1249 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1250 lport = fcoe->ctlr.lp;
1251 if (unlikely(!lport)) {
1252 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure");
1255 if (!lport->link_up)
1258 FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p "
1259 "data:%p tail:%p end:%p sum:%d dev:%s",
1260 skb->len, skb->data_len, skb->head, skb->data,
1261 skb_tail_pointer(skb), skb_end_pointer(skb),
1262 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1266 if (is_fip_mode(&fcoe->ctlr) &&
1267 compare_ether_addr(eh->h_source, fcoe->ctlr.dest_addr)) {
1268 FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
1274 * Check for minimum frame length, and make sure required FCoE
1275 * and FC headers are pulled into the linear data area.
1277 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1278 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1281 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1282 fh = (struct fc_frame_header *) skb_transport_header(skb);
1284 if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
1285 FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
1290 fr = fcoe_dev_from_skb(skb);
1295 * In case the incoming frame's exchange is originated from
1296 * the initiator, then received frame's exchange id is ANDed
1297 * with fc_cpu_mask bits to get the same cpu on which exchange
1298 * was originated, otherwise just use the current cpu.
1300 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1301 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1303 cpu = smp_processor_id();
1305 fps = &per_cpu(fcoe_percpu, cpu);
1306 spin_lock_bh(&fps->fcoe_rx_list.lock);
1307 if (unlikely(!fps->thread)) {
1309 * The targeted CPU is not ready, let's target
1310 * the first CPU now. For non-SMP systems this
1311 * will check the same CPU twice.
1313 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
1314 "ready for incoming skb- using first online "
1317 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1318 cpu = cpumask_first(cpu_online_mask);
1319 fps = &per_cpu(fcoe_percpu, cpu);
1320 spin_lock_bh(&fps->fcoe_rx_list.lock);
1322 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1328 * We now have a valid CPU that we're targeting for
1329 * this skb. We also have this receive thread locked,
1330 * so we're free to queue skbs into it's queue.
1333 /* If this is a SCSI-FCP frame, and this is already executing on the
1334 * correct CPU, and the queue for this CPU is empty, then go ahead
1335 * and process the frame directly in the softirq context.
1336 * This lets us process completions without context switching from the
1337 * NET_RX softirq, to our receive processing thread, and then back to
1338 * BLOCK softirq context.
1340 if (fh->fh_type == FC_TYPE_FCP &&
1341 cpu == smp_processor_id() &&
1342 skb_queue_empty(&fps->fcoe_rx_list)) {
1343 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1344 fcoe_recv_frame(skb);
1346 __skb_queue_tail(&fps->fcoe_rx_list, skb);
1347 if (fps->fcoe_rx_list.qlen == 1)
1348 wake_up_process(fps->thread);
1349 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1354 per_cpu_ptr(lport->dev_stats, get_cpu())->ErrorFrames++;
1362 * fcoe_start_io() - Start FCoE I/O
1363 * @skb: The packet to be transmitted
1365 * This routine is called from the net device to start transmitting
1368 * Returns: 0 for success
1370 static inline int fcoe_start_io(struct sk_buff *skb)
1372 struct sk_buff *nskb;
1375 nskb = skb_clone(skb, GFP_ATOMIC);
1376 rc = dev_queue_xmit(nskb);
1384 * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1385 * @skb: The packet to be transmitted
1386 * @tlen: The total length of the trailer
1388 * This routine allocates a page for frame trailers. The page is re-used if
1389 * there is enough room left on it for the current trailer. If there isn't
1390 * enough buffer left a new page is allocated for the trailer. Reference to
1391 * the page from this function as well as the skbs using the page fragments
1392 * ensure that the page is freed at the appropriate time.
1394 * Returns: 0 for success
1396 static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
1398 struct fcoe_percpu_s *fps;
1401 fps = &get_cpu_var(fcoe_percpu);
1402 page = fps->crc_eof_page;
1404 page = alloc_page(GFP_ATOMIC);
1406 put_cpu_var(fcoe_percpu);
1409 fps->crc_eof_page = page;
1410 fps->crc_eof_offset = 0;
1414 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
1415 fps->crc_eof_offset, tlen);
1417 skb->data_len += tlen;
1418 skb->truesize += tlen;
1419 fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
1421 if (fps->crc_eof_offset >= PAGE_SIZE) {
1422 fps->crc_eof_page = NULL;
1423 fps->crc_eof_offset = 0;
1426 put_cpu_var(fcoe_percpu);
1431 * fcoe_fc_crc() - Calculates the CRC for a given frame
1432 * @fp: The frame to be checksumed
1434 * This uses crc32() routine to calculate the CRC for a frame
1436 * Return: The 32 bit CRC value
1438 u32 fcoe_fc_crc(struct fc_frame *fp)
1440 struct sk_buff *skb = fp_skb(fp);
1441 struct skb_frag_struct *frag;
1442 unsigned char *data;
1443 unsigned long off, len, clen;
1447 crc = crc32(~0, skb->data, skb_headlen(skb));
1449 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1450 frag = &skb_shinfo(skb)->frags[i];
1451 off = frag->page_offset;
1454 clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
1455 data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
1456 KM_SKB_DATA_SOFTIRQ);
1457 crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
1458 kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
1467 * fcoe_xmit() - Transmit a FCoE frame
1468 * @lport: The local port that the frame is to be transmitted for
1469 * @fp: The frame to be transmitted
1471 * Return: 0 for success
1473 int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1478 struct fcoe_crc_eof *cp;
1479 struct sk_buff *skb;
1480 struct fcoe_dev_stats *stats;
1481 struct fc_frame_header *fh;
1482 unsigned int hlen; /* header length implies the version */
1483 unsigned int tlen; /* trailer length */
1484 unsigned int elen; /* eth header, may include vlan */
1485 struct fcoe_port *port = lport_priv(lport);
1486 struct fcoe_interface *fcoe = port->fcoe;
1488 struct fcoe_hdr *hp;
1490 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1492 fh = fc_frame_header_get(fp);
1494 wlen = skb->len / FCOE_WORD_TO_BYTE;
1496 if (!lport->link_up) {
1501 if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1502 fcoe_ctlr_els_send(&fcoe->ctlr, lport, skb))
1508 elen = sizeof(struct ethhdr);
1509 hlen = sizeof(struct fcoe_hdr);
1510 tlen = sizeof(struct fcoe_crc_eof);
1511 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1514 if (likely(lport->crc_offload)) {
1515 skb->ip_summed = CHECKSUM_PARTIAL;
1516 skb->csum_start = skb_headroom(skb);
1517 skb->csum_offset = skb->len;
1520 skb->ip_summed = CHECKSUM_NONE;
1521 crc = fcoe_fc_crc(fp);
1524 /* copy port crc and eof to the skb buff */
1525 if (skb_is_nonlinear(skb)) {
1527 if (fcoe_get_paged_crc_eof(skb, tlen)) {
1531 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1532 cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
1533 + frag->page_offset;
1535 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1538 memset(cp, 0, sizeof(*cp));
1540 cp->fcoe_crc32 = cpu_to_le32(~crc);
1542 if (skb_is_nonlinear(skb)) {
1543 kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
1547 /* adjust skb network/transport offsets to match mac/fcoe/port */
1548 skb_push(skb, elen + hlen);
1549 skb_reset_mac_header(skb);
1550 skb_reset_network_header(skb);
1551 skb->mac_len = elen;
1552 skb->protocol = htons(ETH_P_FCOE);
1553 skb->dev = fcoe->netdev;
1555 /* fill up mac and fcoe headers */
1557 eh->h_proto = htons(ETH_P_FCOE);
1558 memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN);
1559 if (fcoe->ctlr.map_dest)
1560 memcpy(eh->h_dest + 3, fh->fh_d_id, 3);
1562 if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN))
1563 memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN);
1565 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1567 hp = (struct fcoe_hdr *)(eh + 1);
1568 memset(hp, 0, sizeof(*hp));
1570 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1573 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1574 if (lport->seq_offload && fr_max_payload(fp)) {
1575 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1576 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1578 skb_shinfo(skb)->gso_type = 0;
1579 skb_shinfo(skb)->gso_size = 0;
1581 /* update tx stats: regardless if LLD fails */
1582 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1584 stats->TxWords += wlen;
1587 /* send down to lld */
1589 if (port->fcoe_pending_queue.qlen)
1590 fcoe_check_wait_queue(lport, skb);
1591 else if (fcoe_start_io(skb))
1592 fcoe_check_wait_queue(lport, skb);
1598 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
1599 * @skb: The completed skb (argument required by destructor)
1601 static void fcoe_percpu_flush_done(struct sk_buff *skb)
1603 complete(&fcoe_flush_completion);
1607 * fcoe_recv_frame() - process a single received frame
1608 * @skb: frame to process
1610 static void fcoe_recv_frame(struct sk_buff *skb)
1613 struct fc_lport *lport;
1614 struct fcoe_rcv_info *fr;
1615 struct fcoe_dev_stats *stats;
1616 struct fc_frame_header *fh;
1617 struct fcoe_crc_eof crc_eof;
1618 struct fc_frame *fp;
1619 struct fcoe_port *port;
1620 struct fcoe_hdr *hp;
1622 fr = fcoe_dev_from_skb(skb);
1624 if (unlikely(!lport)) {
1625 if (skb->destructor != fcoe_percpu_flush_done)
1626 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
1631 FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
1632 "head:%p data:%p tail:%p end:%p sum:%d dev:%s",
1633 skb->len, skb->data_len,
1634 skb->head, skb->data, skb_tail_pointer(skb),
1635 skb_end_pointer(skb), skb->csum,
1636 skb->dev ? skb->dev->name : "<NULL>");
1638 port = lport_priv(lport);
1639 if (skb_is_nonlinear(skb))
1640 skb_linearize(skb); /* not ideal */
1643 * Frame length checks and setting up the header pointers
1644 * was done in fcoe_rcv already.
1646 hp = (struct fcoe_hdr *) skb_network_header(skb);
1647 fh = (struct fc_frame_header *) skb_transport_header(skb);
1649 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1650 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1651 if (stats->ErrorFrames < 5)
1652 printk(KERN_WARNING "fcoe: FCoE version "
1653 "mismatch: The frame has "
1654 "version %x, but the "
1655 "initiator supports version "
1656 "%x\n", FC_FCOE_DECAPS_VER(hp),
1661 skb_pull(skb, sizeof(struct fcoe_hdr));
1662 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1665 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1667 fp = (struct fc_frame *)skb;
1670 fr_sof(fp) = hp->fcoe_sof;
1672 /* Copy out the CRC and EOF trailer for access */
1673 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1675 fr_eof(fp) = crc_eof.fcoe_eof;
1676 fr_crc(fp) = crc_eof.fcoe_crc32;
1677 if (pskb_trim(skb, fr_len))
1681 * We only check CRC if no offload is available and if it is
1682 * it's solicited data, in which case, the FCP layer would
1683 * check it during the copy.
1685 if (lport->crc_offload &&
1686 skb->ip_summed == CHECKSUM_UNNECESSARY)
1687 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1689 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1691 fh = fc_frame_header_get(fp);
1692 if ((fh->fh_r_ctl != FC_RCTL_DD_SOL_DATA ||
1693 fh->fh_type != FC_TYPE_FCP) &&
1694 (fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
1695 if (le32_to_cpu(fr_crc(fp)) !=
1696 ~crc32(~0, skb->data, fr_len)) {
1697 if (stats->InvalidCRCCount < 5)
1698 printk(KERN_WARNING "fcoe: dropping "
1699 "frame with CRC error\n");
1700 stats->InvalidCRCCount++;
1703 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1706 fc_exch_recv(lport, fp);
1710 stats->ErrorFrames++;
1716 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread
1717 * @arg: The per-CPU context
1719 * Return: 0 for success
1721 int fcoe_percpu_receive_thread(void *arg)
1723 struct fcoe_percpu_s *p = arg;
1724 struct sk_buff *skb;
1726 set_user_nice(current, -20);
1728 while (!kthread_should_stop()) {
1730 spin_lock_bh(&p->fcoe_rx_list.lock);
1731 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
1732 set_current_state(TASK_INTERRUPTIBLE);
1733 spin_unlock_bh(&p->fcoe_rx_list.lock);
1735 set_current_state(TASK_RUNNING);
1736 if (kthread_should_stop())
1738 spin_lock_bh(&p->fcoe_rx_list.lock);
1740 spin_unlock_bh(&p->fcoe_rx_list.lock);
1741 fcoe_recv_frame(skb);
1747 * fcoe_check_wait_queue() - Attempt to clear the transmit backlog
1748 * @lport: The local port whose backlog is to be cleared
1750 * This empties the wait_queue, dequeues the head of the wait_queue queue
1751 * and calls fcoe_start_io() for each packet. If all skb have been
1752 * transmitted it returns the qlen. If an error occurs it restores
1753 * wait_queue (to try again later) and returns -1.
1755 * The wait_queue is used when the skb transmit fails. The failed skb
1756 * will go in the wait_queue which will be emptied by the timer function or
1757 * by the next skb transmit.
1759 static void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb)
1761 struct fcoe_port *port = lport_priv(lport);
1764 spin_lock_bh(&port->fcoe_pending_queue.lock);
1767 __skb_queue_tail(&port->fcoe_pending_queue, skb);
1769 if (port->fcoe_pending_queue_active)
1771 port->fcoe_pending_queue_active = 1;
1773 while (port->fcoe_pending_queue.qlen) {
1774 /* keep qlen > 0 until fcoe_start_io succeeds */
1775 port->fcoe_pending_queue.qlen++;
1776 skb = __skb_dequeue(&port->fcoe_pending_queue);
1778 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1779 rc = fcoe_start_io(skb);
1780 spin_lock_bh(&port->fcoe_pending_queue.lock);
1783 __skb_queue_head(&port->fcoe_pending_queue, skb);
1784 /* undo temporary increment above */
1785 port->fcoe_pending_queue.qlen--;
1788 /* undo temporary increment above */
1789 port->fcoe_pending_queue.qlen--;
1792 if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
1794 if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
1795 mod_timer(&port->timer, jiffies + 2);
1796 port->fcoe_pending_queue_active = 0;
1798 if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
1800 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1805 * fcoe_dev_setup() - Setup the link change notification interface
1807 static void fcoe_dev_setup(void)
1809 register_netdevice_notifier(&fcoe_notifier);
1813 * fcoe_dev_cleanup() - Cleanup the link change notification interface
1815 static void fcoe_dev_cleanup(void)
1817 unregister_netdevice_notifier(&fcoe_notifier);
1821 * fcoe_device_notification() - Handler for net device events
1822 * @notifier: The context of the notification
1823 * @event: The type of event
1824 * @ptr: The net device that the event was on
1826 * This function is called by the Ethernet driver in case of link change event.
1828 * Returns: 0 for success
1830 static int fcoe_device_notification(struct notifier_block *notifier,
1831 ulong event, void *ptr)
1833 struct fc_lport *lport = NULL;
1834 struct net_device *netdev = ptr;
1835 struct fcoe_interface *fcoe;
1836 struct fcoe_port *port;
1837 struct fcoe_dev_stats *stats;
1838 u32 link_possible = 1;
1842 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1843 if (fcoe->netdev == netdev) {
1844 lport = fcoe->ctlr.lp;
1855 case NETDEV_GOING_DOWN:
1861 case NETDEV_CHANGEMTU:
1862 if (netdev->features & NETIF_F_FCOE_MTU)
1864 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
1865 sizeof(struct fcoe_crc_eof));
1866 if (mfs >= FC_MIN_MAX_FRAME)
1867 fc_set_mfs(lport, mfs);
1869 case NETDEV_REGISTER:
1871 case NETDEV_UNREGISTER:
1872 list_del(&fcoe->list);
1873 port = lport_priv(fcoe->ctlr.lp);
1874 fcoe_interface_cleanup(fcoe);
1875 schedule_work(&port->destroy_work);
1878 case NETDEV_FEAT_CHANGE:
1879 fcoe_netdev_features_change(lport, netdev);
1882 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
1883 "from netdev netlink\n", event);
1886 fcoe_link_speed_update(lport);
1888 if (link_possible && !fcoe_link_ok(lport))
1889 fcoe_ctlr_link_up(&fcoe->ctlr);
1890 else if (fcoe_ctlr_link_down(&fcoe->ctlr)) {
1891 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1892 stats->LinkFailureCount++;
1894 fcoe_clean_pending_queue(lport);
1901 * fcoe_if_to_netdev() - Parse a name buffer to get a net device
1902 * @buffer: The name of the net device
1904 * Returns: NULL or a ptr to net_device
1906 static struct net_device *fcoe_if_to_netdev(const char *buffer)
1909 char ifname[IFNAMSIZ + 2];
1912 strlcpy(ifname, buffer, IFNAMSIZ);
1913 cp = ifname + strlen(ifname);
1914 while (--cp >= ifname && *cp == '\n')
1916 return dev_get_by_name(&init_net, ifname);
1922 * fcoe_disable() - Disables a FCoE interface
1923 * @buffer: The name of the Ethernet interface to be disabled
1924 * @kp: The associated kernel parameter
1926 * Called from sysfs.
1928 * Returns: 0 for success
1930 static int fcoe_disable(const char *buffer, struct kernel_param *kp)
1932 struct fcoe_interface *fcoe;
1933 struct net_device *netdev;
1936 mutex_lock(&fcoe_config_mutex);
1937 #ifdef CONFIG_FCOE_MODULE
1939 * Make sure the module has been initialized, and is not about to be
1940 * removed. Module paramter sysfs files are writable before the
1941 * module_init function is called and after module_exit.
1943 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
1949 netdev = fcoe_if_to_netdev(buffer);
1955 if (!rtnl_trylock()) {
1957 mutex_unlock(&fcoe_config_mutex);
1958 return restart_syscall();
1961 fcoe = fcoe_hostlist_lookup_port(netdev);
1965 fcoe_ctlr_link_down(&fcoe->ctlr);
1966 fcoe_clean_pending_queue(fcoe->ctlr.lp);
1972 mutex_unlock(&fcoe_config_mutex);
1977 * fcoe_enable() - Enables a FCoE interface
1978 * @buffer: The name of the Ethernet interface to be enabled
1979 * @kp: The associated kernel parameter
1981 * Called from sysfs.
1983 * Returns: 0 for success
1985 static int fcoe_enable(const char *buffer, struct kernel_param *kp)
1987 struct fcoe_interface *fcoe;
1988 struct net_device *netdev;
1991 mutex_lock(&fcoe_config_mutex);
1992 #ifdef CONFIG_FCOE_MODULE
1994 * Make sure the module has been initialized, and is not about to be
1995 * removed. Module paramter sysfs files are writable before the
1996 * module_init function is called and after module_exit.
1998 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
2004 netdev = fcoe_if_to_netdev(buffer);
2010 if (!rtnl_trylock()) {
2012 mutex_unlock(&fcoe_config_mutex);
2013 return restart_syscall();
2016 fcoe = fcoe_hostlist_lookup_port(netdev);
2021 else if (!fcoe_link_ok(fcoe->ctlr.lp))
2022 fcoe_ctlr_link_up(&fcoe->ctlr);
2026 mutex_unlock(&fcoe_config_mutex);
2031 * fcoe_destroy() - Destroy a FCoE interface
2032 * @buffer: The name of the Ethernet interface to be destroyed
2033 * @kp: The associated kernel parameter
2035 * Called from sysfs.
2037 * Returns: 0 for success
2039 static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
2041 struct fcoe_interface *fcoe;
2042 struct net_device *netdev;
2045 mutex_lock(&fcoe_config_mutex);
2046 #ifdef CONFIG_FCOE_MODULE
2048 * Make sure the module has been initialized, and is not about to be
2049 * removed. Module paramter sysfs files are writable before the
2050 * module_init function is called and after module_exit.
2052 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
2058 netdev = fcoe_if_to_netdev(buffer);
2064 if (!rtnl_trylock()) {
2066 mutex_unlock(&fcoe_config_mutex);
2067 return restart_syscall();
2070 fcoe = fcoe_hostlist_lookup_port(netdev);
2076 fcoe_interface_cleanup(fcoe);
2077 list_del(&fcoe->list);
2078 /* RTNL mutex is dropped by fcoe_if_destroy */
2079 fcoe_if_destroy(fcoe->ctlr.lp);
2084 mutex_unlock(&fcoe_config_mutex);
2089 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2090 * @work: Handle to the FCoE port to be destroyed
2092 static void fcoe_destroy_work(struct work_struct *work)
2094 struct fcoe_port *port;
2096 port = container_of(work, struct fcoe_port, destroy_work);
2097 mutex_lock(&fcoe_config_mutex);
2099 /* RTNL mutex is dropped by fcoe_if_destroy */
2100 fcoe_if_destroy(port->lport);
2101 mutex_unlock(&fcoe_config_mutex);
2105 * fcoe_create() - Create a fcoe interface
2106 * @buffer: The name of the Ethernet interface to create on
2107 * @kp: The associated kernel param
2109 * Called from sysfs.
2111 * Returns: 0 for success
2113 static int fcoe_create(const char *buffer, struct kernel_param *kp)
2115 enum fip_state fip_mode = (enum fip_state)(long)kp->arg;
2117 struct fcoe_interface *fcoe;
2118 struct fc_lport *lport;
2119 struct net_device *netdev;
2121 mutex_lock(&fcoe_config_mutex);
2123 if (!rtnl_trylock()) {
2124 mutex_unlock(&fcoe_config_mutex);
2125 return restart_syscall();
2128 #ifdef CONFIG_FCOE_MODULE
2130 * Make sure the module has been initialized, and is not about to be
2131 * removed. Module paramter sysfs files are writable before the
2132 * module_init function is called and after module_exit.
2134 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
2140 if (!try_module_get(THIS_MODULE)) {
2145 netdev = fcoe_if_to_netdev(buffer);
2151 /* look for existing lport */
2152 if (fcoe_hostlist_lookup(netdev)) {
2157 fcoe = fcoe_interface_create(netdev, fip_mode);
2163 lport = fcoe_if_create(fcoe, &netdev->dev, 0);
2164 if (IS_ERR(lport)) {
2165 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2168 fcoe_interface_cleanup(fcoe);
2172 /* Make this the "master" N_Port */
2173 fcoe->ctlr.lp = lport;
2175 /* add to lports list */
2176 fcoe_hostlist_add(lport);
2178 /* start FIP Discovery and FLOGI */
2179 lport->boot_time = jiffies;
2180 fc_fabric_login(lport);
2181 if (!fcoe_link_ok(lport))
2182 fcoe_ctlr_link_up(&fcoe->ctlr);
2185 * Release from init in fcoe_interface_create(), on success lport
2186 * should be holding a reference taken in fcoe_if_create().
2188 fcoe_interface_put(fcoe);
2191 mutex_unlock(&fcoe_config_mutex);
2195 fcoe_interface_put(fcoe);
2199 module_put(THIS_MODULE);
2202 mutex_unlock(&fcoe_config_mutex);
2207 * fcoe_link_speed_update() - Update the supported and actual link speeds
2208 * @lport: The local port to update speeds for
2210 * Returns: 0 if the ethtool query was successful
2211 * -1 if the ethtool query failed
2213 int fcoe_link_speed_update(struct fc_lport *lport)
2215 struct fcoe_port *port = lport_priv(lport);
2216 struct net_device *netdev = port->fcoe->netdev;
2217 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
2219 if (!dev_ethtool_get_settings(netdev, &ecmd)) {
2220 lport->link_supported_speeds &=
2221 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
2222 if (ecmd.supported & (SUPPORTED_1000baseT_Half |
2223 SUPPORTED_1000baseT_Full))
2224 lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
2225 if (ecmd.supported & SUPPORTED_10000baseT_Full)
2226 lport->link_supported_speeds |=
2227 FC_PORTSPEED_10GBIT;
2228 if (ecmd.speed == SPEED_1000)
2229 lport->link_speed = FC_PORTSPEED_1GBIT;
2230 if (ecmd.speed == SPEED_10000)
2231 lport->link_speed = FC_PORTSPEED_10GBIT;
2239 * fcoe_link_ok() - Check if the link is OK for a local port
2240 * @lport: The local port to check link on
2242 * Returns: 0 if link is UP and OK, -1 if not
2245 int fcoe_link_ok(struct fc_lport *lport)
2247 struct fcoe_port *port = lport_priv(lport);
2248 struct net_device *netdev = port->fcoe->netdev;
2250 if (netif_oper_up(netdev))
2256 * fcoe_percpu_clean() - Clear all pending skbs for an local port
2257 * @lport: The local port whose skbs are to be cleared
2259 * Must be called with fcoe_create_mutex held to single-thread completion.
2261 * This flushes the pending skbs by adding a new skb to each queue and
2262 * waiting until they are all freed. This assures us that not only are
2263 * there no packets that will be handled by the lport, but also that any
2264 * threads already handling packet have returned.
2266 void fcoe_percpu_clean(struct fc_lport *lport)
2268 struct fcoe_percpu_s *pp;
2269 struct fcoe_rcv_info *fr;
2270 struct sk_buff_head *list;
2271 struct sk_buff *skb, *next;
2272 struct sk_buff *head;
2275 for_each_possible_cpu(cpu) {
2276 pp = &per_cpu(fcoe_percpu, cpu);
2277 spin_lock_bh(&pp->fcoe_rx_list.lock);
2278 list = &pp->fcoe_rx_list;
2280 for (skb = head; skb != (struct sk_buff *)list;
2283 fr = fcoe_dev_from_skb(skb);
2284 if (fr->fr_dev == lport) {
2285 __skb_unlink(skb, list);
2290 if (!pp->thread || !cpu_online(cpu)) {
2291 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2295 skb = dev_alloc_skb(0);
2297 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2300 skb->destructor = fcoe_percpu_flush_done;
2302 __skb_queue_tail(&pp->fcoe_rx_list, skb);
2303 if (pp->fcoe_rx_list.qlen == 1)
2304 wake_up_process(pp->thread);
2305 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2307 wait_for_completion(&fcoe_flush_completion);
2312 * fcoe_clean_pending_queue() - Dequeue a skb and free it
2313 * @lport: The local port to dequeue a skb on
2315 void fcoe_clean_pending_queue(struct fc_lport *lport)
2317 struct fcoe_port *port = lport_priv(lport);
2318 struct sk_buff *skb;
2320 spin_lock_bh(&port->fcoe_pending_queue.lock);
2321 while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
2322 spin_unlock_bh(&port->fcoe_pending_queue.lock);
2324 spin_lock_bh(&port->fcoe_pending_queue.lock);
2326 spin_unlock_bh(&port->fcoe_pending_queue.lock);
2330 * fcoe_reset() - Reset a local port
2331 * @shost: The SCSI host associated with the local port to be reset
2333 * Returns: Always 0 (return value required by FC transport template)
2335 int fcoe_reset(struct Scsi_Host *shost)
2337 struct fc_lport *lport = shost_priv(shost);
2338 fc_lport_reset(lport);
2343 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2344 * @netdev: The net device used as a key
2346 * Locking: Must be called with the RNL mutex held.
2348 * Returns: NULL or the FCoE interface
2350 static struct fcoe_interface *
2351 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2353 struct fcoe_interface *fcoe;
2355 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2356 if (fcoe->netdev == netdev)
2363 * fcoe_hostlist_lookup() - Find the local port associated with a
2365 * @netdev: The netdevice used as a key
2367 * Locking: Must be called with the RTNL mutex held
2369 * Returns: NULL or the local port
2371 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2373 struct fcoe_interface *fcoe;
2375 fcoe = fcoe_hostlist_lookup_port(netdev);
2376 return (fcoe) ? fcoe->ctlr.lp : NULL;
2380 * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2381 * port to the hostlist
2382 * @lport: The local port that identifies the FCoE interface to be added
2384 * Locking: must be called with the RTNL mutex held
2386 * Returns: 0 for success
2388 static int fcoe_hostlist_add(const struct fc_lport *lport)
2390 struct fcoe_interface *fcoe;
2391 struct fcoe_port *port;
2393 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2395 port = lport_priv(lport);
2397 list_add_tail(&fcoe->list, &fcoe_hostlist);
2403 * fcoe_init() - Initialize fcoe.ko
2405 * Returns: 0 on success, or a negative value on failure
2407 static int __init fcoe_init(void)
2409 struct fcoe_percpu_s *p;
2413 mutex_lock(&fcoe_config_mutex);
2415 for_each_possible_cpu(cpu) {
2416 p = &per_cpu(fcoe_percpu, cpu);
2417 skb_queue_head_init(&p->fcoe_rx_list);
2420 for_each_online_cpu(cpu)
2421 fcoe_percpu_thread_create(cpu);
2423 /* Initialize per CPU interrupt thread */
2424 rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
2428 /* Setup link change notification */
2431 rc = fcoe_if_init();
2435 mutex_unlock(&fcoe_config_mutex);
2439 for_each_online_cpu(cpu) {
2440 fcoe_percpu_thread_destroy(cpu);
2442 mutex_unlock(&fcoe_config_mutex);
2445 module_init(fcoe_init);
2448 * fcoe_exit() - Clean up fcoe.ko
2450 * Returns: 0 on success or a negative value on failure
2452 static void __exit fcoe_exit(void)
2454 struct fcoe_interface *fcoe, *tmp;
2455 struct fcoe_port *port;
2458 mutex_lock(&fcoe_config_mutex);
2462 /* releases the associated fcoe hosts */
2464 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2465 list_del(&fcoe->list);
2466 port = lport_priv(fcoe->ctlr.lp);
2467 fcoe_interface_cleanup(fcoe);
2468 schedule_work(&port->destroy_work);
2472 unregister_hotcpu_notifier(&fcoe_cpu_notifier);
2474 for_each_online_cpu(cpu)
2475 fcoe_percpu_thread_destroy(cpu);
2477 mutex_unlock(&fcoe_config_mutex);
2479 /* flush any asyncronous interface destroys,
2480 * this should happen after the netdev notifier is unregistered */
2481 flush_scheduled_work();
2482 /* That will flush out all the N_Ports on the hostlist, but now we
2483 * may have NPIV VN_Ports scheduled for destruction */
2484 flush_scheduled_work();
2486 /* detach from scsi transport
2487 * must happen after all destroys are done, therefor after the flush */
2490 module_exit(fcoe_exit);
2493 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2494 * @seq: active sequence in the FLOGI or FDISC exchange
2495 * @fp: response frame, or error encoded in a pointer (timeout)
2496 * @arg: pointer the the fcoe_ctlr structure
2498 * This handles MAC address management for FCoE, then passes control on to
2499 * the libfc FLOGI response handler.
2501 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2503 struct fcoe_ctlr *fip = arg;
2504 struct fc_exch *exch = fc_seq_exch(seq);
2505 struct fc_lport *lport = exch->lp;
2511 mac = fr_cb(fp)->granted_mac;
2512 if (is_zero_ether_addr(mac)) {
2514 if (fcoe_ctlr_recv_flogi(fip, lport, fp)) {
2519 fcoe_update_src_mac(lport, mac);
2521 fc_lport_flogi_resp(seq, fp, lport);
2525 * fcoe_logo_resp() - FCoE specific LOGO response handler
2526 * @seq: active sequence in the LOGO exchange
2527 * @fp: response frame, or error encoded in a pointer (timeout)
2528 * @arg: pointer the the fcoe_ctlr structure
2530 * This handles MAC address management for FCoE, then passes control on to
2531 * the libfc LOGO response handler.
2533 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2535 struct fc_lport *lport = arg;
2536 static u8 zero_mac[ETH_ALEN] = { 0 };
2539 fcoe_update_src_mac(lport, zero_mac);
2540 fc_lport_logo_resp(seq, fp, lport);
2544 * fcoe_elsct_send - FCoE specific ELS handler
2546 * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2547 * using FCoE specific response handlers and passing the FIP controller as
2548 * the argument (the lport is still available from the exchange).
2550 * Most of the work here is just handed off to the libfc routine.
2552 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2553 struct fc_frame *fp, unsigned int op,
2554 void (*resp)(struct fc_seq *,
2557 void *arg, u32 timeout)
2559 struct fcoe_port *port = lport_priv(lport);
2560 struct fcoe_interface *fcoe = port->fcoe;
2561 struct fcoe_ctlr *fip = &fcoe->ctlr;
2562 struct fc_frame_header *fh = fc_frame_header_get(fp);
2567 if (lport->point_to_multipoint)
2569 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2572 /* only hook onto fabric logouts, not port logouts */
2573 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2575 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2578 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2582 * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2583 * @vport: fc_vport object to create a new fc_host for
2584 * @disabled: start the new fc_host in a disabled state by default?
2586 * Returns: 0 for success
2588 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2590 struct Scsi_Host *shost = vport_to_shost(vport);
2591 struct fc_lport *n_port = shost_priv(shost);
2592 struct fcoe_port *port = lport_priv(n_port);
2593 struct fcoe_interface *fcoe = port->fcoe;
2594 struct net_device *netdev = fcoe->netdev;
2595 struct fc_lport *vn_port;
2597 mutex_lock(&fcoe_config_mutex);
2598 vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2599 mutex_unlock(&fcoe_config_mutex);
2601 if (IS_ERR(vn_port)) {
2602 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2608 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2610 vn_port->boot_time = jiffies;
2611 fc_fabric_login(vn_port);
2612 fc_vport_setlink(vn_port);
2618 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2619 * @vport: fc_vport object that is being destroyed
2621 * Returns: 0 for success
2623 static int fcoe_vport_destroy(struct fc_vport *vport)
2625 struct Scsi_Host *shost = vport_to_shost(vport);
2626 struct fc_lport *n_port = shost_priv(shost);
2627 struct fc_lport *vn_port = vport->dd_data;
2628 struct fcoe_port *port = lport_priv(vn_port);
2630 mutex_lock(&n_port->lp_mutex);
2631 list_del(&vn_port->list);
2632 mutex_unlock(&n_port->lp_mutex);
2633 schedule_work(&port->destroy_work);
2638 * fcoe_vport_disable() - change vport state
2639 * @vport: vport to bring online/offline
2640 * @disable: should the vport be disabled?
2642 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2644 struct fc_lport *lport = vport->dd_data;
2647 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2648 fc_fabric_logoff(lport);
2650 lport->boot_time = jiffies;
2651 fc_fabric_login(lport);
2652 fc_vport_setlink(lport);
2659 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
2660 * @vport: fc_vport with a new symbolic name string
2662 * After generating a new symbolic name string, a new RSPN_ID request is
2663 * sent to the name server. There is no response handler, so if it fails
2664 * for some reason it will not be retried.
2666 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2668 struct fc_lport *lport = vport->dd_data;
2669 struct fc_frame *fp;
2672 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2673 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2674 fcoe_netdev(lport)->name, vport->symbolic_name);
2676 if (lport->state != LPORT_ST_READY)
2679 len = strnlen(fc_host_symbolic_name(lport->host), 255);
2680 fp = fc_frame_alloc(lport,
2681 sizeof(struct fc_ct_hdr) +
2682 sizeof(struct fc_ns_rspn) + len);
2685 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2686 NULL, NULL, 3 * lport->r_a_tov);
2690 * fcoe_get_lesb() - Fill the FCoE Link Error Status Block
2691 * @lport: the local port
2692 * @fc_lesb: the link error status block
2694 static void fcoe_get_lesb(struct fc_lport *lport,
2695 struct fc_els_lesb *fc_lesb)
2698 u32 lfc, vlfc, mdac;
2699 struct fcoe_dev_stats *devst;
2700 struct fcoe_fc_els_lesb *lesb;
2701 struct rtnl_link_stats64 temp;
2702 struct net_device *netdev = fcoe_netdev(lport);
2707 lesb = (struct fcoe_fc_els_lesb *)fc_lesb;
2708 memset(lesb, 0, sizeof(*lesb));
2709 for_each_possible_cpu(cpu) {
2710 devst = per_cpu_ptr(lport->dev_stats, cpu);
2711 lfc += devst->LinkFailureCount;
2712 vlfc += devst->VLinkFailureCount;
2713 mdac += devst->MissDiscAdvCount;
2715 lesb->lesb_link_fail = htonl(lfc);
2716 lesb->lesb_vlink_fail = htonl(vlfc);
2717 lesb->lesb_miss_fka = htonl(mdac);
2718 lesb->lesb_fcs_error = htonl(dev_get_stats(netdev, &temp)->rx_crc_errors);
2722 * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2723 * @lport: the local port
2724 * @port_id: the port ID
2725 * @fp: the received frame, if any, that caused the port_id to be set.
2727 * This routine handles the case where we received a FLOGI and are
2728 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi()
2729 * so it can set the non-mapped mode and gateway address.
2731 * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2733 static void fcoe_set_port_id(struct fc_lport *lport,
2734 u32 port_id, struct fc_frame *fp)
2736 struct fcoe_port *port = lport_priv(lport);
2737 struct fcoe_interface *fcoe = port->fcoe;
2739 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2740 fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp);