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_ok(struct fc_lport *);
79 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
80 static int fcoe_hostlist_add(const struct fc_lport *);
82 static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *);
83 static int fcoe_device_notification(struct notifier_block *, ulong, void *);
84 static void fcoe_dev_setup(void);
85 static void fcoe_dev_cleanup(void);
86 static struct fcoe_interface
87 *fcoe_hostlist_lookup_port(const struct net_device *);
89 static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
90 struct packet_type *, struct net_device *);
92 static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
93 static void fcoe_update_src_mac(struct fc_lport *, u8 *);
94 static u8 *fcoe_get_src_mac(struct fc_lport *);
95 static void fcoe_destroy_work(struct work_struct *);
97 static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
99 static int fcoe_ddp_done(struct fc_lport *, u16);
101 static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
103 static int fcoe_create(const char *, struct kernel_param *);
104 static int fcoe_destroy(const char *, struct kernel_param *);
105 static int fcoe_enable(const char *, struct kernel_param *);
106 static int fcoe_disable(const char *, struct kernel_param *);
108 static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
109 u32 did, struct fc_frame *,
111 void (*resp)(struct fc_seq *,
114 void *, u32 timeout);
115 static void fcoe_recv_frame(struct sk_buff *skb);
117 static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
119 module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
120 __MODULE_PARM_TYPE(create, "string");
121 MODULE_PARM_DESC(create, " Creates fcoe instance on a ethernet interface");
122 module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
123 __MODULE_PARM_TYPE(destroy, "string");
124 MODULE_PARM_DESC(destroy, " Destroys fcoe instance on a ethernet interface");
125 module_param_call(enable, fcoe_enable, NULL, NULL, S_IWUSR);
126 __MODULE_PARM_TYPE(enable, "string");
127 MODULE_PARM_DESC(enable, " Enables fcoe on a ethernet interface.");
128 module_param_call(disable, fcoe_disable, NULL, NULL, S_IWUSR);
129 __MODULE_PARM_TYPE(disable, "string");
130 MODULE_PARM_DESC(disable, " Disables fcoe on a ethernet interface.");
132 /* notification function for packets from net device */
133 static struct notifier_block fcoe_notifier = {
134 .notifier_call = fcoe_device_notification,
137 /* notification function for CPU hotplug events */
138 static struct notifier_block fcoe_cpu_notifier = {
139 .notifier_call = fcoe_cpu_callback,
142 static struct scsi_transport_template *fcoe_transport_template;
143 static struct scsi_transport_template *fcoe_vport_transport_template;
145 static int fcoe_vport_destroy(struct fc_vport *);
146 static int fcoe_vport_create(struct fc_vport *, bool disabled);
147 static int fcoe_vport_disable(struct fc_vport *, bool disable);
148 static void fcoe_set_vport_symbolic_name(struct fc_vport *);
149 static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
151 static struct libfc_function_template fcoe_libfc_fcn_templ = {
152 .frame_send = fcoe_xmit,
153 .ddp_setup = fcoe_ddp_setup,
154 .ddp_done = fcoe_ddp_done,
155 .elsct_send = fcoe_elsct_send,
156 .get_lesb = fcoe_get_lesb,
157 .lport_set_port_id = fcoe_set_port_id,
160 struct fc_function_template fcoe_transport_function = {
161 .show_host_node_name = 1,
162 .show_host_port_name = 1,
163 .show_host_supported_classes = 1,
164 .show_host_supported_fc4s = 1,
165 .show_host_active_fc4s = 1,
166 .show_host_maxframe_size = 1,
168 .show_host_port_id = 1,
169 .show_host_supported_speeds = 1,
170 .get_host_speed = fc_get_host_speed,
171 .show_host_speed = 1,
172 .show_host_port_type = 1,
173 .get_host_port_state = fc_get_host_port_state,
174 .show_host_port_state = 1,
175 .show_host_symbolic_name = 1,
177 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
178 .show_rport_maxframe_size = 1,
179 .show_rport_supported_classes = 1,
181 .show_host_fabric_name = 1,
182 .show_starget_node_name = 1,
183 .show_starget_port_name = 1,
184 .show_starget_port_id = 1,
185 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
186 .show_rport_dev_loss_tmo = 1,
187 .get_fc_host_stats = fc_get_host_stats,
188 .issue_fc_host_lip = fcoe_reset,
190 .terminate_rport_io = fc_rport_terminate_io,
192 .vport_create = fcoe_vport_create,
193 .vport_delete = fcoe_vport_destroy,
194 .vport_disable = fcoe_vport_disable,
195 .set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
197 .bsg_request = fc_lport_bsg_request,
200 struct fc_function_template fcoe_vport_transport_function = {
201 .show_host_node_name = 1,
202 .show_host_port_name = 1,
203 .show_host_supported_classes = 1,
204 .show_host_supported_fc4s = 1,
205 .show_host_active_fc4s = 1,
206 .show_host_maxframe_size = 1,
208 .show_host_port_id = 1,
209 .show_host_supported_speeds = 1,
210 .get_host_speed = fc_get_host_speed,
211 .show_host_speed = 1,
212 .show_host_port_type = 1,
213 .get_host_port_state = fc_get_host_port_state,
214 .show_host_port_state = 1,
215 .show_host_symbolic_name = 1,
217 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
218 .show_rport_maxframe_size = 1,
219 .show_rport_supported_classes = 1,
221 .show_host_fabric_name = 1,
222 .show_starget_node_name = 1,
223 .show_starget_port_name = 1,
224 .show_starget_port_id = 1,
225 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
226 .show_rport_dev_loss_tmo = 1,
227 .get_fc_host_stats = fc_get_host_stats,
228 .issue_fc_host_lip = fcoe_reset,
230 .terminate_rport_io = fc_rport_terminate_io,
232 .bsg_request = fc_lport_bsg_request,
235 static struct scsi_host_template fcoe_shost_template = {
236 .module = THIS_MODULE,
237 .name = "FCoE Driver",
238 .proc_name = FCOE_NAME,
239 .queuecommand = fc_queuecommand,
240 .eh_abort_handler = fc_eh_abort,
241 .eh_device_reset_handler = fc_eh_device_reset,
242 .eh_host_reset_handler = fc_eh_host_reset,
243 .slave_alloc = fc_slave_alloc,
244 .change_queue_depth = fc_change_queue_depth,
245 .change_queue_type = fc_change_queue_type,
248 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
249 .use_clustering = ENABLE_CLUSTERING,
250 .sg_tablesize = SG_ALL,
251 .max_sectors = 0xffff,
255 * fcoe_interface_setup() - Setup a FCoE interface
256 * @fcoe: The new FCoE interface
257 * @netdev: The net device that the fcoe interface is on
259 * Returns : 0 for success
260 * Locking: must be called with the RTNL mutex held
262 static int fcoe_interface_setup(struct fcoe_interface *fcoe,
263 struct net_device *netdev)
265 struct fcoe_ctlr *fip = &fcoe->ctlr;
266 struct netdev_hw_addr *ha;
267 struct net_device *real_dev;
268 u8 flogi_maddr[ETH_ALEN];
269 const struct net_device_ops *ops;
271 fcoe->netdev = netdev;
273 /* Let LLD initialize for FCoE */
274 ops = netdev->netdev_ops;
275 if (ops->ndo_fcoe_enable) {
276 if (ops->ndo_fcoe_enable(netdev))
277 FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
278 " specific feature for LLD.\n");
281 /* Do not support for bonding device */
282 if ((netdev->priv_flags & IFF_MASTER_ALB) ||
283 (netdev->priv_flags & IFF_SLAVE_INACTIVE) ||
284 (netdev->priv_flags & IFF_MASTER_8023AD)) {
285 FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
289 /* look for SAN MAC address, if multiple SAN MACs exist, only
290 * use the first one for SPMA */
291 real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
292 vlan_dev_real_dev(netdev) : netdev;
294 for_each_dev_addr(real_dev, ha) {
295 if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
296 (is_valid_ether_addr(ha->addr))) {
297 memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
304 /* setup Source Mac Address */
306 memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);
309 * Add FCoE MAC address as second unicast MAC address
310 * or enter promiscuous mode if not capable of listening
311 * for multiple unicast MACs.
313 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
314 dev_unicast_add(netdev, flogi_maddr);
316 dev_unicast_add(netdev, fip->ctl_src_addr);
317 dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
320 * setup the receive function from ethernet driver
321 * on the ethertype for the given device
323 fcoe->fcoe_packet_type.func = fcoe_rcv;
324 fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
325 fcoe->fcoe_packet_type.dev = netdev;
326 dev_add_pack(&fcoe->fcoe_packet_type);
328 fcoe->fip_packet_type.func = fcoe_fip_recv;
329 fcoe->fip_packet_type.type = htons(ETH_P_FIP);
330 fcoe->fip_packet_type.dev = netdev;
331 dev_add_pack(&fcoe->fip_packet_type);
337 * fcoe_interface_create() - Create a FCoE interface on a net device
338 * @netdev: The net device to create the FCoE interface on
340 * Returns: pointer to a struct fcoe_interface or NULL on error
342 static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev)
344 struct fcoe_interface *fcoe;
347 fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL);
349 FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n");
354 kref_init(&fcoe->kref);
359 fcoe_ctlr_init(&fcoe->ctlr);
360 fcoe->ctlr.send = fcoe_fip_send;
361 fcoe->ctlr.update_mac = fcoe_update_src_mac;
362 fcoe->ctlr.get_src_addr = fcoe_get_src_mac;
364 err = fcoe_interface_setup(fcoe, netdev);
366 fcoe_ctlr_destroy(&fcoe->ctlr);
376 * fcoe_interface_cleanup() - Clean up a FCoE interface
377 * @fcoe: The FCoE interface to be cleaned up
379 * Caller must be holding the RTNL mutex
381 void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
383 struct net_device *netdev = fcoe->netdev;
384 struct fcoe_ctlr *fip = &fcoe->ctlr;
385 u8 flogi_maddr[ETH_ALEN];
386 const struct net_device_ops *ops;
389 * Don't listen for Ethernet packets anymore.
390 * synchronize_net() ensures that the packet handlers are not running
391 * on another CPU. dev_remove_pack() would do that, this calls the
392 * unsyncronized version __dev_remove_pack() to avoid multiple delays.
394 __dev_remove_pack(&fcoe->fcoe_packet_type);
395 __dev_remove_pack(&fcoe->fip_packet_type);
398 /* Delete secondary MAC addresses */
399 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
400 dev_unicast_delete(netdev, flogi_maddr);
402 dev_unicast_delete(netdev, fip->ctl_src_addr);
403 dev_mc_delete(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0);
405 /* Tell the LLD we are done w/ FCoE */
406 ops = netdev->netdev_ops;
407 if (ops->ndo_fcoe_disable) {
408 if (ops->ndo_fcoe_disable(netdev))
409 FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
410 " specific feature for LLD.\n");
415 * fcoe_interface_release() - fcoe_port kref release function
416 * @kref: Embedded reference count in an fcoe_interface struct
418 static void fcoe_interface_release(struct kref *kref)
420 struct fcoe_interface *fcoe;
421 struct net_device *netdev;
423 fcoe = container_of(kref, struct fcoe_interface, kref);
424 netdev = fcoe->netdev;
425 /* tear-down the FCoE controller */
426 fcoe_ctlr_destroy(&fcoe->ctlr);
432 * fcoe_interface_get() - Get a reference to a FCoE interface
433 * @fcoe: The FCoE interface to be held
435 static inline void fcoe_interface_get(struct fcoe_interface *fcoe)
437 kref_get(&fcoe->kref);
441 * fcoe_interface_put() - Put a reference to a FCoE interface
442 * @fcoe: The FCoE interface to be released
444 static inline void fcoe_interface_put(struct fcoe_interface *fcoe)
446 kref_put(&fcoe->kref, fcoe_interface_release);
450 * fcoe_fip_recv() - Handler for received FIP frames
451 * @skb: The receive skb
452 * @netdev: The associated net device
453 * @ptype: The packet_type structure which was used to register this handler
454 * @orig_dev: The original net_device the the skb was received on.
455 * (in case dev is a bond)
457 * Returns: 0 for success
459 static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
460 struct packet_type *ptype,
461 struct net_device *orig_dev)
463 struct fcoe_interface *fcoe;
465 fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
466 fcoe_ctlr_recv(&fcoe->ctlr, skb);
471 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
472 * @fip: The FCoE controller
473 * @skb: The FIP packet to be sent
475 static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
477 skb->dev = fcoe_from_ctlr(fip)->netdev;
482 * fcoe_update_src_mac() - Update the Ethernet MAC filters
483 * @lport: The local port to update the source MAC on
484 * @addr: Unicast MAC address to add
486 * Remove any previously-set unicast MAC filter.
487 * Add secondary FCoE MAC address filter for our OUI.
489 static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
491 struct fcoe_port *port = lport_priv(lport);
492 struct fcoe_interface *fcoe = port->fcoe;
495 if (!is_zero_ether_addr(port->data_src_addr))
496 dev_unicast_delete(fcoe->netdev, port->data_src_addr);
497 if (!is_zero_ether_addr(addr))
498 dev_unicast_add(fcoe->netdev, addr);
499 memcpy(port->data_src_addr, addr, ETH_ALEN);
504 * fcoe_get_src_mac() - return the Ethernet source address for an lport
505 * @lport: libfc lport
507 static u8 *fcoe_get_src_mac(struct fc_lport *lport)
509 struct fcoe_port *port = lport_priv(lport);
511 return port->data_src_addr;
515 * fcoe_lport_config() - Set up a local port
516 * @lport: The local port to be setup
518 * Returns: 0 for success
520 static int fcoe_lport_config(struct fc_lport *lport)
524 lport->max_retry_count = 3;
525 lport->max_rport_retry_count = 3;
526 lport->e_d_tov = 2 * 1000; /* FC-FS default */
527 lport->r_a_tov = 2 * 2 * 1000;
528 lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
529 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
530 lport->does_npiv = 1;
532 fc_lport_init_stats(lport);
534 /* lport fc_lport related configuration */
535 fc_lport_config(lport);
537 /* offload related configuration */
538 lport->crc_offload = 0;
539 lport->seq_offload = 0;
540 lport->lro_enabled = 0;
548 * fcoe_queue_timer() - The fcoe queue timer
549 * @lport: The local port
551 * Calls fcoe_check_wait_queue on timeout
553 static void fcoe_queue_timer(ulong lport)
555 fcoe_check_wait_queue((struct fc_lport *)lport, NULL);
559 * fcoe_get_wwn() - Get the world wide name from LLD if it supports it
560 * @netdev: the associated net device
561 * @wwn: the output WWN
562 * @type: the type of WWN (WWPN or WWNN)
564 * Returns: 0 for success
566 static int fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
568 const struct net_device_ops *ops = netdev->netdev_ops;
570 if (ops->ndo_fcoe_get_wwn)
571 return ops->ndo_fcoe_get_wwn(netdev, wwn, type);
576 * fcoe_netdev_config() - Set up net devive for SW FCoE
577 * @lport: The local port that is associated with the net device
578 * @netdev: The associated net device
580 * Must be called after fcoe_lport_config() as it will use local port mutex
582 * Returns: 0 for success
584 static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
588 struct fcoe_interface *fcoe;
589 struct fcoe_port *port;
592 /* Setup lport private data to point to fcoe softc */
593 port = lport_priv(lport);
597 * Determine max frame size based on underlying device and optional
598 * user-configured limit. If the MFS is too low, fcoe_link_ok()
599 * will return 0, so do this first.
602 if (netdev->features & NETIF_F_FCOE_MTU) {
604 FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
606 mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
607 if (fc_set_mfs(lport, mfs))
610 /* offload features support */
611 if (netdev->features & NETIF_F_SG)
614 if (netdev->features & NETIF_F_FCOE_CRC) {
615 lport->crc_offload = 1;
616 FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
618 if (netdev->features & NETIF_F_FSO) {
619 lport->seq_offload = 1;
620 lport->lso_max = netdev->gso_max_size;
621 FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
624 if (netdev->fcoe_ddp_xid) {
625 lport->lro_enabled = 1;
626 lport->lro_xid = netdev->fcoe_ddp_xid;
627 FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
630 skb_queue_head_init(&port->fcoe_pending_queue);
631 port->fcoe_pending_queue_active = 0;
632 setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);
636 * Use NAA 1&2 (FC-FS Rev. 2.0, Sec. 15) to generate WWNN/WWPN:
637 * For WWNN, we use NAA 1 w/ bit 27-16 of word 0 as 0.
638 * For WWPN, we use NAA 2 w/ bit 27-16 of word 0 from VLAN ID
640 if (netdev->priv_flags & IFF_802_1Q_VLAN)
641 vid = vlan_dev_vlan_id(netdev);
643 if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
644 wwnn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr, 1, 0);
645 fc_set_wwnn(lport, wwnn);
646 if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
647 wwpn = fcoe_wwn_from_mac(fcoe->ctlr.ctl_src_addr,
649 fc_set_wwpn(lport, wwpn);
656 * fcoe_shost_config() - Set up the SCSI host associated with a local port
657 * @lport: The local port
658 * @dev: The device associated with the SCSI host
660 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
662 * Returns: 0 for success
664 static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
668 /* lport scsi host config */
669 lport->host->max_lun = FCOE_MAX_LUN;
670 lport->host->max_id = FCOE_MAX_FCP_TARGET;
671 lport->host->max_channel = 0;
672 lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;
675 lport->host->transportt = fcoe_vport_transport_template;
677 lport->host->transportt = fcoe_transport_template;
679 /* add the new host to the SCSI-ml */
680 rc = scsi_add_host(lport->host, dev);
682 FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
683 "error on scsi_add_host\n");
688 fc_host_max_npiv_vports(lport->host) = USHORT_MAX;
690 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
691 "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
692 fcoe_netdev(lport)->name);
698 * fcoe_oem_match() - The match routine for the offloaded exchange manager
701 * This routine will be associated with an exchange manager (EM). When
702 * the libfc exchange handling code is looking for an EM to use it will
703 * call this routine and pass it the frame that it wishes to send. This
704 * routine will return True if the associated EM is to be used and False
705 * if the echange code should continue looking for an EM.
707 * The offload EM that this routine is associated with will handle any
708 * packets that are for SCSI read requests.
710 * Returns: True for read types I/O, otherwise returns false.
712 bool fcoe_oem_match(struct fc_frame *fp)
714 return fc_fcp_is_read(fr_fsp(fp)) &&
715 (fr_fsp(fp)->data_len > fcoe_ddp_min);
719 * fcoe_em_config() - Allocate and configure an exchange manager
720 * @lport: The local port that the new EM will be associated with
722 * Returns: 0 on success
724 static inline int fcoe_em_config(struct fc_lport *lport)
726 struct fcoe_port *port = lport_priv(lport);
727 struct fcoe_interface *fcoe = port->fcoe;
728 struct fcoe_interface *oldfcoe = NULL;
729 struct net_device *old_real_dev, *cur_real_dev;
730 u16 min_xid = FCOE_MIN_XID;
731 u16 max_xid = FCOE_MAX_XID;
734 * Check if need to allocate an em instance for
735 * offload exchange ids to be shared across all VN_PORTs/lport.
737 if (!lport->lro_enabled || !lport->lro_xid ||
738 (lport->lro_xid >= max_xid)) {
744 * Reuse existing offload em instance in case
745 * it is already allocated on real eth device
747 if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
748 cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
750 cur_real_dev = fcoe->netdev;
752 list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
753 if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
754 old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
756 old_real_dev = oldfcoe->netdev;
758 if (cur_real_dev == old_real_dev) {
759 fcoe->oem = oldfcoe->oem;
765 if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
766 printk(KERN_ERR "fcoe_em_config: failed to add "
767 "offload em:%p on interface:%s\n",
768 fcoe->oem, fcoe->netdev->name);
772 fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
773 FCOE_MIN_XID, lport->lro_xid,
776 printk(KERN_ERR "fcoe_em_config: failed to allocate "
777 "em for offload exches on interface:%s\n",
784 * Exclude offload EM xid range from next EM xid range.
786 min_xid += lport->lro_xid + 1;
789 if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
790 printk(KERN_ERR "fcoe_em_config: failed to "
791 "allocate em on interface %s\n", fcoe->netdev->name);
799 * fcoe_if_destroy() - Tear down a SW FCoE instance
800 * @lport: The local port to be destroyed
802 static void fcoe_if_destroy(struct fc_lport *lport)
804 struct fcoe_port *port = lport_priv(lport);
805 struct fcoe_interface *fcoe = port->fcoe;
806 struct net_device *netdev = fcoe->netdev;
808 FCOE_NETDEV_DBG(netdev, "Destroying interface\n");
810 /* Logout of the fabric */
811 fc_fabric_logoff(lport);
813 /* Cleanup the fc_lport */
814 fc_lport_destroy(lport);
815 fc_fcp_destroy(lport);
817 /* Stop the transmit retry timer */
818 del_timer_sync(&port->timer);
820 /* Free existing transmit skbs */
821 fcoe_clean_pending_queue(lport);
824 if (!is_zero_ether_addr(port->data_src_addr))
825 dev_unicast_delete(netdev, port->data_src_addr);
828 /* receives may not be stopped until after this */
829 fcoe_interface_put(fcoe);
831 /* Free queued packets for the per-CPU receive threads */
832 fcoe_percpu_clean(lport);
834 /* Detach from the scsi-ml */
835 fc_remove_host(lport->host);
836 scsi_remove_host(lport->host);
838 /* There are no more rports or I/O, free the EM */
839 fc_exch_mgr_free(lport);
841 /* Free memory used by statistical counters */
842 fc_lport_free_stats(lport);
844 /* Release the Scsi_Host */
845 scsi_host_put(lport->host);
849 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
850 * @lport: The local port to setup DDP for
851 * @xid: The exchange ID for this DDP transfer
852 * @sgl: The scatterlist describing this transfer
853 * @sgc: The number of sg items
855 * Returns: 0 if the DDP context was not configured
857 static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
858 struct scatterlist *sgl, unsigned int sgc)
860 struct net_device *netdev = fcoe_netdev(lport);
862 if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
863 return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
871 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
872 * @lport: The local port to complete DDP on
873 * @xid: The exchange ID for this DDP transfer
875 * Returns: the length of data that have been completed by DDP
877 static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
879 struct net_device *netdev = fcoe_netdev(lport);
881 if (netdev->netdev_ops->ndo_fcoe_ddp_done)
882 return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
887 * fcoe_if_create() - Create a FCoE instance on an interface
888 * @fcoe: The FCoE interface to create a local port on
889 * @parent: The device pointer to be the parent in sysfs for the SCSI host
890 * @npiv: Indicates if the port is a vport or not
892 * Creates a fc_lport instance and a Scsi_Host instance and configure them.
894 * Returns: The allocated fc_lport or an error pointer
896 static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
897 struct device *parent, int npiv)
899 struct net_device *netdev = fcoe->netdev;
900 struct fc_lport *lport = NULL;
901 struct fcoe_port *port;
904 * parent is only a vport if npiv is 1,
905 * but we'll only use vport in that case so go ahead and set it
907 struct fc_vport *vport = dev_to_vport(parent);
909 FCOE_NETDEV_DBG(netdev, "Create Interface\n");
912 lport = libfc_host_alloc(&fcoe_shost_template,
913 sizeof(struct fcoe_port));
915 lport = libfc_vport_create(vport,
916 sizeof(struct fcoe_port));
919 FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
923 port = lport_priv(lport);
926 INIT_WORK(&port->destroy_work, fcoe_destroy_work);
928 /* configure a fc_lport including the exchange manager */
929 rc = fcoe_lport_config(lport);
931 FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
937 FCOE_NETDEV_DBG(netdev, "Setting vport names, 0x%llX 0x%llX\n",
938 vport->node_name, vport->port_name);
939 fc_set_wwnn(lport, vport->node_name);
940 fc_set_wwpn(lport, vport->port_name);
943 /* configure lport network properties */
944 rc = fcoe_netdev_config(lport, netdev);
946 FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
951 /* configure lport scsi host properties */
952 rc = fcoe_shost_config(lport, parent);
954 FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
959 /* Initialize the library */
960 rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ);
962 FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
969 * fcoe_em_alloc() and fcoe_hostlist_add() both
970 * need to be atomic with respect to other changes to the
971 * hostlist since fcoe_em_alloc() looks for an existing EM
972 * instance on host list updated by fcoe_hostlist_add().
974 * This is currently handled through the fcoe_config_mutex
978 /* lport exch manager allocation */
979 rc = fcoe_em_config(lport);
981 FCOE_NETDEV_DBG(netdev, "Could not configure the EM "
982 "for the interface\n");
987 fcoe_interface_get(fcoe);
991 fc_exch_mgr_free(lport);
993 scsi_host_put(lport->host);
999 * fcoe_if_init() - Initialization routine for fcoe.ko
1001 * Attaches the SW FCoE transport to the FC transport
1003 * Returns: 0 on success
1005 static int __init fcoe_if_init(void)
1007 /* attach to scsi transport */
1008 fcoe_transport_template = fc_attach_transport(&fcoe_transport_function);
1009 fcoe_vport_transport_template =
1010 fc_attach_transport(&fcoe_vport_transport_function);
1012 if (!fcoe_transport_template) {
1013 printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
1021 * fcoe_if_exit() - Tear down fcoe.ko
1023 * Detaches the SW FCoE transport from the FC transport
1025 * Returns: 0 on success
1027 int __exit fcoe_if_exit(void)
1029 fc_release_transport(fcoe_transport_template);
1030 fc_release_transport(fcoe_vport_transport_template);
1031 fcoe_transport_template = NULL;
1032 fcoe_vport_transport_template = NULL;
1037 * fcoe_percpu_thread_create() - Create a receive thread for an online CPU
1038 * @cpu: The CPU index of the CPU to create a receive thread for
1040 static void fcoe_percpu_thread_create(unsigned int cpu)
1042 struct fcoe_percpu_s *p;
1043 struct task_struct *thread;
1045 p = &per_cpu(fcoe_percpu, cpu);
1047 thread = kthread_create(fcoe_percpu_receive_thread,
1048 (void *)p, "fcoethread/%d", cpu);
1050 if (likely(!IS_ERR(thread))) {
1051 kthread_bind(thread, cpu);
1052 wake_up_process(thread);
1054 spin_lock_bh(&p->fcoe_rx_list.lock);
1056 spin_unlock_bh(&p->fcoe_rx_list.lock);
1061 * fcoe_percpu_thread_destroy() - Remove the receive thread of a CPU
1062 * @cpu: The CPU index of the CPU whose receive thread is to be destroyed
1064 * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
1065 * current CPU's Rx thread. If the thread being destroyed is bound to
1066 * the CPU processing this context the skbs will be freed.
1068 static void fcoe_percpu_thread_destroy(unsigned int cpu)
1070 struct fcoe_percpu_s *p;
1071 struct task_struct *thread;
1072 struct page *crc_eof;
1073 struct sk_buff *skb;
1075 struct fcoe_percpu_s *p0;
1076 unsigned targ_cpu = get_cpu();
1077 #endif /* CONFIG_SMP */
1079 FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
1081 /* Prevent any new skbs from being queued for this CPU. */
1082 p = &per_cpu(fcoe_percpu, cpu);
1083 spin_lock_bh(&p->fcoe_rx_list.lock);
1086 crc_eof = p->crc_eof_page;
1087 p->crc_eof_page = NULL;
1088 p->crc_eof_offset = 0;
1089 spin_unlock_bh(&p->fcoe_rx_list.lock);
1093 * Don't bother moving the skb's if this context is running
1094 * on the same CPU that is having its thread destroyed. This
1095 * can easily happen when the module is removed.
1097 if (cpu != targ_cpu) {
1098 p0 = &per_cpu(fcoe_percpu, targ_cpu);
1099 spin_lock_bh(&p0->fcoe_rx_list.lock);
1101 FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
1104 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1105 __skb_queue_tail(&p0->fcoe_rx_list, skb);
1106 spin_unlock_bh(&p0->fcoe_rx_list.lock);
1109 * The targeted CPU is not initialized and cannot accept
1110 * new skbs. Unlock the targeted CPU and drop the skbs
1111 * on the CPU that is going offline.
1113 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1115 spin_unlock_bh(&p0->fcoe_rx_list.lock);
1119 * This scenario occurs when the module is being removed
1120 * and all threads are being destroyed. skbs will continue
1121 * to be shifted from the CPU thread that is being removed
1122 * to the CPU thread associated with the CPU that is processing
1123 * the module removal. Once there is only one CPU Rx thread it
1124 * will reach this case and we will drop all skbs and later
1127 spin_lock_bh(&p->fcoe_rx_list.lock);
1128 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1130 spin_unlock_bh(&p->fcoe_rx_list.lock);
1135 * This a non-SMP scenario where the singular Rx thread is
1136 * being removed. Free all skbs and stop the thread.
1138 spin_lock_bh(&p->fcoe_rx_list.lock);
1139 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1141 spin_unlock_bh(&p->fcoe_rx_list.lock);
1145 kthread_stop(thread);
1152 * fcoe_cpu_callback() - Handler for CPU hotplug events
1153 * @nfb: The callback data block
1154 * @action: The event triggering the callback
1155 * @hcpu: The index of the CPU that the event is for
1157 * This creates or destroys per-CPU data for fcoe
1159 * Returns NOTIFY_OK always.
1161 static int fcoe_cpu_callback(struct notifier_block *nfb,
1162 unsigned long action, void *hcpu)
1164 unsigned cpu = (unsigned long)hcpu;
1168 case CPU_ONLINE_FROZEN:
1169 FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
1170 fcoe_percpu_thread_create(cpu);
1173 case CPU_DEAD_FROZEN:
1174 FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
1175 fcoe_percpu_thread_destroy(cpu);
1184 * fcoe_rcv() - Receive packets from a net device
1185 * @skb: The received packet
1186 * @netdev: The net device that the packet was received on
1187 * @ptype: The packet type context
1188 * @olddev: The last device net device
1190 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
1191 * FC frame and passes the frame to libfc.
1193 * Returns: 0 for success
1195 int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
1196 struct packet_type *ptype, struct net_device *olddev)
1198 struct fc_lport *lport;
1199 struct fcoe_rcv_info *fr;
1200 struct fcoe_interface *fcoe;
1201 struct fc_frame_header *fh;
1202 struct fcoe_percpu_s *fps;
1205 fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
1206 lport = fcoe->ctlr.lp;
1207 if (unlikely(!lport)) {
1208 FCOE_NETDEV_DBG(netdev, "Cannot find hba structure");
1211 if (!lport->link_up)
1214 FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p "
1215 "data:%p tail:%p end:%p sum:%d dev:%s",
1216 skb->len, skb->data_len, skb->head, skb->data,
1217 skb_tail_pointer(skb), skb_end_pointer(skb),
1218 skb->csum, skb->dev ? skb->dev->name : "<NULL>");
1220 /* check for FCOE packet type */
1221 if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
1222 FCOE_NETDEV_DBG(netdev, "Wrong FC type frame");
1227 * Check for minimum frame length, and make sure required FCoE
1228 * and FC headers are pulled into the linear data area.
1230 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
1231 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
1234 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
1235 fh = (struct fc_frame_header *) skb_transport_header(skb);
1237 fr = fcoe_dev_from_skb(skb);
1242 * In case the incoming frame's exchange is originated from
1243 * the initiator, then received frame's exchange id is ANDed
1244 * with fc_cpu_mask bits to get the same cpu on which exchange
1245 * was originated, otherwise just use the current cpu.
1247 if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
1248 cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
1250 cpu = smp_processor_id();
1252 fps = &per_cpu(fcoe_percpu, cpu);
1253 spin_lock_bh(&fps->fcoe_rx_list.lock);
1254 if (unlikely(!fps->thread)) {
1256 * The targeted CPU is not ready, let's target
1257 * the first CPU now. For non-SMP systems this
1258 * will check the same CPU twice.
1260 FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
1261 "ready for incoming skb- using first online "
1264 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1265 cpu = cpumask_first(cpu_online_mask);
1266 fps = &per_cpu(fcoe_percpu, cpu);
1267 spin_lock_bh(&fps->fcoe_rx_list.lock);
1269 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1275 * We now have a valid CPU that we're targeting for
1276 * this skb. We also have this receive thread locked,
1277 * so we're free to queue skbs into it's queue.
1280 /* If this is a SCSI-FCP frame, and this is already executing on the
1281 * correct CPU, and the queue for this CPU is empty, then go ahead
1282 * and process the frame directly in the softirq context.
1283 * This lets us process completions without context switching from the
1284 * NET_RX softirq, to our receive processing thread, and then back to
1285 * BLOCK softirq context.
1287 if (fh->fh_type == FC_TYPE_FCP &&
1288 cpu == smp_processor_id() &&
1289 skb_queue_empty(&fps->fcoe_rx_list)) {
1290 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1291 fcoe_recv_frame(skb);
1293 __skb_queue_tail(&fps->fcoe_rx_list, skb);
1294 if (fps->fcoe_rx_list.qlen == 1)
1295 wake_up_process(fps->thread);
1296 spin_unlock_bh(&fps->fcoe_rx_list.lock);
1301 per_cpu_ptr(lport->dev_stats, get_cpu())->ErrorFrames++;
1309 * fcoe_start_io() - Start FCoE I/O
1310 * @skb: The packet to be transmitted
1312 * This routine is called from the net device to start transmitting
1315 * Returns: 0 for success
1317 static inline int fcoe_start_io(struct sk_buff *skb)
1319 struct sk_buff *nskb;
1322 nskb = skb_clone(skb, GFP_ATOMIC);
1323 rc = dev_queue_xmit(nskb);
1331 * fcoe_get_paged_crc_eof() - Allocate a page to be used for the trailer CRC
1332 * @skb: The packet to be transmitted
1333 * @tlen: The total length of the trailer
1335 * This routine allocates a page for frame trailers. The page is re-used if
1336 * there is enough room left on it for the current trailer. If there isn't
1337 * enough buffer left a new page is allocated for the trailer. Reference to
1338 * the page from this function as well as the skbs using the page fragments
1339 * ensure that the page is freed at the appropriate time.
1341 * Returns: 0 for success
1343 static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
1345 struct fcoe_percpu_s *fps;
1348 fps = &get_cpu_var(fcoe_percpu);
1349 page = fps->crc_eof_page;
1351 page = alloc_page(GFP_ATOMIC);
1353 put_cpu_var(fcoe_percpu);
1356 fps->crc_eof_page = page;
1357 fps->crc_eof_offset = 0;
1361 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
1362 fps->crc_eof_offset, tlen);
1364 skb->data_len += tlen;
1365 skb->truesize += tlen;
1366 fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
1368 if (fps->crc_eof_offset >= PAGE_SIZE) {
1369 fps->crc_eof_page = NULL;
1370 fps->crc_eof_offset = 0;
1373 put_cpu_var(fcoe_percpu);
1378 * fcoe_fc_crc() - Calculates the CRC for a given frame
1379 * @fp: The frame to be checksumed
1381 * This uses crc32() routine to calculate the CRC for a frame
1383 * Return: The 32 bit CRC value
1385 u32 fcoe_fc_crc(struct fc_frame *fp)
1387 struct sk_buff *skb = fp_skb(fp);
1388 struct skb_frag_struct *frag;
1389 unsigned char *data;
1390 unsigned long off, len, clen;
1394 crc = crc32(~0, skb->data, skb_headlen(skb));
1396 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1397 frag = &skb_shinfo(skb)->frags[i];
1398 off = frag->page_offset;
1401 clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
1402 data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
1403 KM_SKB_DATA_SOFTIRQ);
1404 crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
1405 kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
1414 * fcoe_xmit() - Transmit a FCoE frame
1415 * @lport: The local port that the frame is to be transmitted for
1416 * @fp: The frame to be transmitted
1418 * Return: 0 for success
1420 int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
1425 struct fcoe_crc_eof *cp;
1426 struct sk_buff *skb;
1427 struct fcoe_dev_stats *stats;
1428 struct fc_frame_header *fh;
1429 unsigned int hlen; /* header length implies the version */
1430 unsigned int tlen; /* trailer length */
1431 unsigned int elen; /* eth header, may include vlan */
1432 struct fcoe_port *port = lport_priv(lport);
1433 struct fcoe_interface *fcoe = port->fcoe;
1435 struct fcoe_hdr *hp;
1437 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
1439 fh = fc_frame_header_get(fp);
1441 wlen = skb->len / FCOE_WORD_TO_BYTE;
1443 if (!lport->link_up) {
1448 if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
1449 fcoe_ctlr_els_send(&fcoe->ctlr, lport, skb))
1455 elen = sizeof(struct ethhdr);
1456 hlen = sizeof(struct fcoe_hdr);
1457 tlen = sizeof(struct fcoe_crc_eof);
1458 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
1461 if (likely(lport->crc_offload)) {
1462 skb->ip_summed = CHECKSUM_PARTIAL;
1463 skb->csum_start = skb_headroom(skb);
1464 skb->csum_offset = skb->len;
1467 skb->ip_summed = CHECKSUM_NONE;
1468 crc = fcoe_fc_crc(fp);
1471 /* copy port crc and eof to the skb buff */
1472 if (skb_is_nonlinear(skb)) {
1474 if (fcoe_get_paged_crc_eof(skb, tlen)) {
1478 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
1479 cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
1480 + frag->page_offset;
1482 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
1485 memset(cp, 0, sizeof(*cp));
1487 cp->fcoe_crc32 = cpu_to_le32(~crc);
1489 if (skb_is_nonlinear(skb)) {
1490 kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
1494 /* adjust skb network/transport offsets to match mac/fcoe/port */
1495 skb_push(skb, elen + hlen);
1496 skb_reset_mac_header(skb);
1497 skb_reset_network_header(skb);
1498 skb->mac_len = elen;
1499 skb->protocol = htons(ETH_P_FCOE);
1500 skb->dev = fcoe->netdev;
1502 /* fill up mac and fcoe headers */
1504 eh->h_proto = htons(ETH_P_FCOE);
1505 if (fcoe->ctlr.map_dest)
1506 fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
1508 /* insert GW address */
1509 memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN);
1511 if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN))
1512 memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN);
1514 memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);
1516 hp = (struct fcoe_hdr *)(eh + 1);
1517 memset(hp, 0, sizeof(*hp));
1519 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
1522 /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
1523 if (lport->seq_offload && fr_max_payload(fp)) {
1524 skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
1525 skb_shinfo(skb)->gso_size = fr_max_payload(fp);
1527 skb_shinfo(skb)->gso_type = 0;
1528 skb_shinfo(skb)->gso_size = 0;
1530 /* update tx stats: regardless if LLD fails */
1531 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1533 stats->TxWords += wlen;
1536 /* send down to lld */
1538 if (port->fcoe_pending_queue.qlen)
1539 fcoe_check_wait_queue(lport, skb);
1540 else if (fcoe_start_io(skb))
1541 fcoe_check_wait_queue(lport, skb);
1547 * fcoe_percpu_flush_done() - Indicate per-CPU queue flush completion
1548 * @skb: The completed skb (argument required by destructor)
1550 static void fcoe_percpu_flush_done(struct sk_buff *skb)
1552 complete(&fcoe_flush_completion);
1556 * fcoe_recv_frame() - process a single received frame
1557 * @skb: frame to process
1559 static void fcoe_recv_frame(struct sk_buff *skb)
1562 struct fc_lport *lport;
1563 struct fcoe_rcv_info *fr;
1564 struct fcoe_dev_stats *stats;
1565 struct fc_frame_header *fh;
1566 struct fcoe_crc_eof crc_eof;
1567 struct fc_frame *fp;
1568 struct fcoe_port *port;
1569 struct fcoe_hdr *hp;
1571 fr = fcoe_dev_from_skb(skb);
1573 if (unlikely(!lport)) {
1574 if (skb->destructor != fcoe_percpu_flush_done)
1575 FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
1580 FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
1581 "head:%p data:%p tail:%p end:%p sum:%d dev:%s",
1582 skb->len, skb->data_len,
1583 skb->head, skb->data, skb_tail_pointer(skb),
1584 skb_end_pointer(skb), skb->csum,
1585 skb->dev ? skb->dev->name : "<NULL>");
1587 port = lport_priv(lport);
1588 if (skb_is_nonlinear(skb))
1589 skb_linearize(skb); /* not ideal */
1592 * Frame length checks and setting up the header pointers
1593 * was done in fcoe_rcv already.
1595 hp = (struct fcoe_hdr *) skb_network_header(skb);
1596 fh = (struct fc_frame_header *) skb_transport_header(skb);
1598 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1599 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
1600 if (stats->ErrorFrames < 5)
1601 printk(KERN_WARNING "fcoe: FCoE version "
1602 "mismatch: The frame has "
1603 "version %x, but the "
1604 "initiator supports version "
1605 "%x\n", FC_FCOE_DECAPS_VER(hp),
1610 skb_pull(skb, sizeof(struct fcoe_hdr));
1611 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
1614 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
1616 fp = (struct fc_frame *)skb;
1619 fr_sof(fp) = hp->fcoe_sof;
1621 /* Copy out the CRC and EOF trailer for access */
1622 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
1624 fr_eof(fp) = crc_eof.fcoe_eof;
1625 fr_crc(fp) = crc_eof.fcoe_crc32;
1626 if (pskb_trim(skb, fr_len))
1630 * We only check CRC if no offload is available and if it is
1631 * it's solicited data, in which case, the FCP layer would
1632 * check it during the copy.
1634 if (lport->crc_offload &&
1635 skb->ip_summed == CHECKSUM_UNNECESSARY)
1636 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1638 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
1640 fh = fc_frame_header_get(fp);
1641 if ((fh->fh_r_ctl != FC_RCTL_DD_SOL_DATA ||
1642 fh->fh_type != FC_TYPE_FCP) &&
1643 (fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
1644 if (le32_to_cpu(fr_crc(fp)) !=
1645 ~crc32(~0, skb->data, fr_len)) {
1646 if (stats->InvalidCRCCount < 5)
1647 printk(KERN_WARNING "fcoe: dropping "
1648 "frame with CRC error\n");
1649 stats->InvalidCRCCount++;
1652 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
1655 fc_exch_recv(lport, fp);
1659 stats->ErrorFrames++;
1665 * fcoe_percpu_receive_thread() - The per-CPU packet receive thread
1666 * @arg: The per-CPU context
1668 * Return: 0 for success
1670 int fcoe_percpu_receive_thread(void *arg)
1672 struct fcoe_percpu_s *p = arg;
1673 struct sk_buff *skb;
1675 set_user_nice(current, -20);
1677 while (!kthread_should_stop()) {
1679 spin_lock_bh(&p->fcoe_rx_list.lock);
1680 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
1681 set_current_state(TASK_INTERRUPTIBLE);
1682 spin_unlock_bh(&p->fcoe_rx_list.lock);
1684 set_current_state(TASK_RUNNING);
1685 if (kthread_should_stop())
1687 spin_lock_bh(&p->fcoe_rx_list.lock);
1689 spin_unlock_bh(&p->fcoe_rx_list.lock);
1690 fcoe_recv_frame(skb);
1696 * fcoe_check_wait_queue() - Attempt to clear the transmit backlog
1697 * @lport: The local port whose backlog is to be cleared
1699 * This empties the wait_queue, dequeues the head of the wait_queue queue
1700 * and calls fcoe_start_io() for each packet. If all skb have been
1701 * transmitted it returns the qlen. If an error occurs it restores
1702 * wait_queue (to try again later) and returns -1.
1704 * The wait_queue is used when the skb transmit fails. The failed skb
1705 * will go in the wait_queue which will be emptied by the timer function or
1706 * by the next skb transmit.
1708 static void fcoe_check_wait_queue(struct fc_lport *lport, struct sk_buff *skb)
1710 struct fcoe_port *port = lport_priv(lport);
1713 spin_lock_bh(&port->fcoe_pending_queue.lock);
1716 __skb_queue_tail(&port->fcoe_pending_queue, skb);
1718 if (port->fcoe_pending_queue_active)
1720 port->fcoe_pending_queue_active = 1;
1722 while (port->fcoe_pending_queue.qlen) {
1723 /* keep qlen > 0 until fcoe_start_io succeeds */
1724 port->fcoe_pending_queue.qlen++;
1725 skb = __skb_dequeue(&port->fcoe_pending_queue);
1727 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1728 rc = fcoe_start_io(skb);
1729 spin_lock_bh(&port->fcoe_pending_queue.lock);
1732 __skb_queue_head(&port->fcoe_pending_queue, skb);
1733 /* undo temporary increment above */
1734 port->fcoe_pending_queue.qlen--;
1737 /* undo temporary increment above */
1738 port->fcoe_pending_queue.qlen--;
1741 if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
1743 if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer))
1744 mod_timer(&port->timer, jiffies + 2);
1745 port->fcoe_pending_queue_active = 0;
1747 if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
1749 spin_unlock_bh(&port->fcoe_pending_queue.lock);
1754 * fcoe_dev_setup() - Setup the link change notification interface
1756 static void fcoe_dev_setup(void)
1758 register_netdevice_notifier(&fcoe_notifier);
1762 * fcoe_dev_cleanup() - Cleanup the link change notification interface
1764 static void fcoe_dev_cleanup(void)
1766 unregister_netdevice_notifier(&fcoe_notifier);
1770 * fcoe_device_notification() - Handler for net device events
1771 * @notifier: The context of the notification
1772 * @event: The type of event
1773 * @ptr: The net device that the event was on
1775 * This function is called by the Ethernet driver in case of link change event.
1777 * Returns: 0 for success
1779 static int fcoe_device_notification(struct notifier_block *notifier,
1780 ulong event, void *ptr)
1782 struct fc_lport *lport = NULL;
1783 struct net_device *netdev = ptr;
1784 struct fcoe_interface *fcoe;
1785 struct fcoe_port *port;
1786 struct fcoe_dev_stats *stats;
1787 u32 link_possible = 1;
1791 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
1792 if (fcoe->netdev == netdev) {
1793 lport = fcoe->ctlr.lp;
1804 case NETDEV_GOING_DOWN:
1810 case NETDEV_CHANGEMTU:
1811 if (netdev->features & NETIF_F_FCOE_MTU)
1813 mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
1814 sizeof(struct fcoe_crc_eof));
1815 if (mfs >= FC_MIN_MAX_FRAME)
1816 fc_set_mfs(lport, mfs);
1818 case NETDEV_REGISTER:
1820 case NETDEV_UNREGISTER:
1821 list_del(&fcoe->list);
1822 port = lport_priv(fcoe->ctlr.lp);
1823 fcoe_interface_cleanup(fcoe);
1824 schedule_work(&port->destroy_work);
1828 FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
1829 "from netdev netlink\n", event);
1831 if (link_possible && !fcoe_link_ok(lport))
1832 fcoe_ctlr_link_up(&fcoe->ctlr);
1833 else if (fcoe_ctlr_link_down(&fcoe->ctlr)) {
1834 stats = per_cpu_ptr(lport->dev_stats, get_cpu());
1835 stats->LinkFailureCount++;
1837 fcoe_clean_pending_queue(lport);
1844 * fcoe_if_to_netdev() - Parse a name buffer to get a net device
1845 * @buffer: The name of the net device
1847 * Returns: NULL or a ptr to net_device
1849 static struct net_device *fcoe_if_to_netdev(const char *buffer)
1852 char ifname[IFNAMSIZ + 2];
1855 strlcpy(ifname, buffer, IFNAMSIZ);
1856 cp = ifname + strlen(ifname);
1857 while (--cp >= ifname && *cp == '\n')
1859 return dev_get_by_name(&init_net, ifname);
1865 * fcoe_disable() - Disables a FCoE interface
1866 * @buffer: The name of the Ethernet interface to be disabled
1867 * @kp: The associated kernel parameter
1869 * Called from sysfs.
1871 * Returns: 0 for success
1873 static int fcoe_disable(const char *buffer, struct kernel_param *kp)
1875 struct fcoe_interface *fcoe;
1876 struct net_device *netdev;
1879 mutex_lock(&fcoe_config_mutex);
1880 #ifdef CONFIG_FCOE_MODULE
1882 * Make sure the module has been initialized, and is not about to be
1883 * removed. Module paramter sysfs files are writable before the
1884 * module_init function is called and after module_exit.
1886 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
1892 netdev = fcoe_if_to_netdev(buffer);
1899 fcoe = fcoe_hostlist_lookup_port(netdev);
1903 fc_fabric_logoff(fcoe->ctlr.lp);
1904 fcoe_ctlr_link_down(&fcoe->ctlr);
1910 mutex_unlock(&fcoe_config_mutex);
1915 * fcoe_enable() - Enables a FCoE interface
1916 * @buffer: The name of the Ethernet interface to be enabled
1917 * @kp: The associated kernel parameter
1919 * Called from sysfs.
1921 * Returns: 0 for success
1923 static int fcoe_enable(const char *buffer, struct kernel_param *kp)
1925 struct fcoe_interface *fcoe;
1926 struct net_device *netdev;
1929 mutex_lock(&fcoe_config_mutex);
1930 #ifdef CONFIG_FCOE_MODULE
1932 * Make sure the module has been initialized, and is not about to be
1933 * removed. Module paramter sysfs files are writable before the
1934 * module_init function is called and after module_exit.
1936 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
1942 netdev = fcoe_if_to_netdev(buffer);
1949 fcoe = fcoe_hostlist_lookup_port(netdev);
1953 if (!fcoe_link_ok(fcoe->ctlr.lp))
1954 fcoe_ctlr_link_up(&fcoe->ctlr);
1955 rc = fc_fabric_login(fcoe->ctlr.lp);
1961 mutex_unlock(&fcoe_config_mutex);
1966 * fcoe_destroy() - Destroy a FCoE interface
1967 * @buffer: The name of the Ethernet interface to be destroyed
1968 * @kp: The associated kernel parameter
1970 * Called from sysfs.
1972 * Returns: 0 for success
1974 static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
1976 struct fcoe_interface *fcoe;
1977 struct net_device *netdev;
1980 mutex_lock(&fcoe_config_mutex);
1981 #ifdef CONFIG_FCOE_MODULE
1983 * Make sure the module has been initialized, and is not about to be
1984 * removed. Module paramter sysfs files are writable before the
1985 * module_init function is called and after module_exit.
1987 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
1993 netdev = fcoe_if_to_netdev(buffer);
2000 fcoe = fcoe_hostlist_lookup_port(netdev);
2006 list_del(&fcoe->list);
2007 fcoe_interface_cleanup(fcoe);
2009 fcoe_if_destroy(fcoe->ctlr.lp);
2010 module_put(THIS_MODULE);
2015 mutex_unlock(&fcoe_config_mutex);
2020 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
2021 * @work: Handle to the FCoE port to be destroyed
2023 static void fcoe_destroy_work(struct work_struct *work)
2025 struct fcoe_port *port;
2027 port = container_of(work, struct fcoe_port, destroy_work);
2028 mutex_lock(&fcoe_config_mutex);
2029 fcoe_if_destroy(port->lport);
2030 mutex_unlock(&fcoe_config_mutex);
2034 * fcoe_create() - Create a fcoe interface
2035 * @buffer: The name of the Ethernet interface to create on
2036 * @kp: The associated kernel param
2038 * Called from sysfs.
2040 * Returns: 0 for success
2042 static int fcoe_create(const char *buffer, struct kernel_param *kp)
2045 struct fcoe_interface *fcoe;
2046 struct fc_lport *lport;
2047 struct net_device *netdev;
2049 mutex_lock(&fcoe_config_mutex);
2050 #ifdef CONFIG_FCOE_MODULE
2052 * Make sure the module has been initialized, and is not about to be
2053 * removed. Module paramter sysfs files are writable before the
2054 * module_init function is called and after module_exit.
2056 if (THIS_MODULE->state != MODULE_STATE_LIVE) {
2062 if (!try_module_get(THIS_MODULE)) {
2068 netdev = fcoe_if_to_netdev(buffer);
2074 /* look for existing lport */
2075 if (fcoe_hostlist_lookup(netdev)) {
2080 fcoe = fcoe_interface_create(netdev);
2086 lport = fcoe_if_create(fcoe, &netdev->dev, 0);
2087 if (IS_ERR(lport)) {
2088 printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
2091 fcoe_interface_cleanup(fcoe);
2095 /* Make this the "master" N_Port */
2096 fcoe->ctlr.lp = lport;
2098 /* add to lports list */
2099 fcoe_hostlist_add(lport);
2101 /* start FIP Discovery and FLOGI */
2102 lport->boot_time = jiffies;
2103 fc_fabric_login(lport);
2104 if (!fcoe_link_ok(lport))
2105 fcoe_ctlr_link_up(&fcoe->ctlr);
2108 * Release from init in fcoe_interface_create(), on success lport
2109 * should be holding a reference taken in fcoe_if_create().
2111 fcoe_interface_put(fcoe);
2114 mutex_unlock(&fcoe_config_mutex);
2118 fcoe_interface_put(fcoe);
2123 module_put(THIS_MODULE);
2125 mutex_unlock(&fcoe_config_mutex);
2130 * fcoe_link_ok() - Check if the link is OK for a local port
2131 * @lport: The local port to check link on
2133 * Any permanently-disqualifying conditions have been previously checked.
2134 * This also updates the speed setting, which may change with link for 100/1000.
2136 * This function should probably be checking for PAUSE support at some point
2137 * in the future. Currently Per-priority-pause is not determinable using
2138 * ethtool, so we shouldn't be restrictive until that problem is resolved.
2140 * Returns: 0 if link is OK for use by FCoE.
2143 int fcoe_link_ok(struct fc_lport *lport)
2145 struct fcoe_port *port = lport_priv(lport);
2146 struct net_device *netdev = port->fcoe->netdev;
2147 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
2149 if (netif_oper_up(netdev) && !dev_ethtool_get_settings(netdev, &ecmd)) {
2150 lport->link_supported_speeds &=
2151 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
2152 if (ecmd.supported & (SUPPORTED_1000baseT_Half |
2153 SUPPORTED_1000baseT_Full))
2154 lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
2155 if (ecmd.supported & SUPPORTED_10000baseT_Full)
2156 lport->link_supported_speeds |=
2157 FC_PORTSPEED_10GBIT;
2158 if (ecmd.speed == SPEED_1000)
2159 lport->link_speed = FC_PORTSPEED_1GBIT;
2160 if (ecmd.speed == SPEED_10000)
2161 lport->link_speed = FC_PORTSPEED_10GBIT;
2169 * fcoe_percpu_clean() - Clear all pending skbs for an local port
2170 * @lport: The local port whose skbs are to be cleared
2172 * Must be called with fcoe_create_mutex held to single-thread completion.
2174 * This flushes the pending skbs by adding a new skb to each queue and
2175 * waiting until they are all freed. This assures us that not only are
2176 * there no packets that will be handled by the lport, but also that any
2177 * threads already handling packet have returned.
2179 void fcoe_percpu_clean(struct fc_lport *lport)
2181 struct fcoe_percpu_s *pp;
2182 struct fcoe_rcv_info *fr;
2183 struct sk_buff_head *list;
2184 struct sk_buff *skb, *next;
2185 struct sk_buff *head;
2188 for_each_possible_cpu(cpu) {
2189 pp = &per_cpu(fcoe_percpu, cpu);
2190 spin_lock_bh(&pp->fcoe_rx_list.lock);
2191 list = &pp->fcoe_rx_list;
2193 for (skb = head; skb != (struct sk_buff *)list;
2196 fr = fcoe_dev_from_skb(skb);
2197 if (fr->fr_dev == lport) {
2198 __skb_unlink(skb, list);
2203 if (!pp->thread || !cpu_online(cpu)) {
2204 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2208 skb = dev_alloc_skb(0);
2210 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2213 skb->destructor = fcoe_percpu_flush_done;
2215 __skb_queue_tail(&pp->fcoe_rx_list, skb);
2216 if (pp->fcoe_rx_list.qlen == 1)
2217 wake_up_process(pp->thread);
2218 spin_unlock_bh(&pp->fcoe_rx_list.lock);
2220 wait_for_completion(&fcoe_flush_completion);
2225 * fcoe_clean_pending_queue() - Dequeue a skb and free it
2226 * @lport: The local port to dequeue a skb on
2228 void fcoe_clean_pending_queue(struct fc_lport *lport)
2230 struct fcoe_port *port = lport_priv(lport);
2231 struct sk_buff *skb;
2233 spin_lock_bh(&port->fcoe_pending_queue.lock);
2234 while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) {
2235 spin_unlock_bh(&port->fcoe_pending_queue.lock);
2237 spin_lock_bh(&port->fcoe_pending_queue.lock);
2239 spin_unlock_bh(&port->fcoe_pending_queue.lock);
2243 * fcoe_reset() - Reset a local port
2244 * @shost: The SCSI host associated with the local port to be reset
2246 * Returns: Always 0 (return value required by FC transport template)
2248 int fcoe_reset(struct Scsi_Host *shost)
2250 struct fc_lport *lport = shost_priv(shost);
2251 fc_lport_reset(lport);
2256 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
2257 * @netdev: The net device used as a key
2259 * Locking: Must be called with the RNL mutex held.
2261 * Returns: NULL or the FCoE interface
2263 static struct fcoe_interface *
2264 fcoe_hostlist_lookup_port(const struct net_device *netdev)
2266 struct fcoe_interface *fcoe;
2268 list_for_each_entry(fcoe, &fcoe_hostlist, list) {
2269 if (fcoe->netdev == netdev)
2276 * fcoe_hostlist_lookup() - Find the local port associated with a
2278 * @netdev: The netdevice used as a key
2280 * Locking: Must be called with the RTNL mutex held
2282 * Returns: NULL or the local port
2284 static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
2286 struct fcoe_interface *fcoe;
2288 fcoe = fcoe_hostlist_lookup_port(netdev);
2289 return (fcoe) ? fcoe->ctlr.lp : NULL;
2293 * fcoe_hostlist_add() - Add the FCoE interface identified by a local
2294 * port to the hostlist
2295 * @lport: The local port that identifies the FCoE interface to be added
2297 * Locking: must be called with the RTNL mutex held
2299 * Returns: 0 for success
2301 static int fcoe_hostlist_add(const struct fc_lport *lport)
2303 struct fcoe_interface *fcoe;
2304 struct fcoe_port *port;
2306 fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
2308 port = lport_priv(lport);
2310 list_add_tail(&fcoe->list, &fcoe_hostlist);
2316 * fcoe_init() - Initialize fcoe.ko
2318 * Returns: 0 on success, or a negative value on failure
2320 static int __init fcoe_init(void)
2322 struct fcoe_percpu_s *p;
2326 mutex_lock(&fcoe_config_mutex);
2328 for_each_possible_cpu(cpu) {
2329 p = &per_cpu(fcoe_percpu, cpu);
2330 skb_queue_head_init(&p->fcoe_rx_list);
2333 for_each_online_cpu(cpu)
2334 fcoe_percpu_thread_create(cpu);
2336 /* Initialize per CPU interrupt thread */
2337 rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
2341 /* Setup link change notification */
2344 rc = fcoe_if_init();
2348 mutex_unlock(&fcoe_config_mutex);
2352 for_each_online_cpu(cpu) {
2353 fcoe_percpu_thread_destroy(cpu);
2355 mutex_unlock(&fcoe_config_mutex);
2358 module_init(fcoe_init);
2361 * fcoe_exit() - Clean up fcoe.ko
2363 * Returns: 0 on success or a negative value on failure
2365 static void __exit fcoe_exit(void)
2367 struct fcoe_interface *fcoe, *tmp;
2368 struct fcoe_port *port;
2371 mutex_lock(&fcoe_config_mutex);
2375 /* releases the associated fcoe hosts */
2377 list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
2378 list_del(&fcoe->list);
2379 port = lport_priv(fcoe->ctlr.lp);
2380 fcoe_interface_cleanup(fcoe);
2381 schedule_work(&port->destroy_work);
2385 unregister_hotcpu_notifier(&fcoe_cpu_notifier);
2387 for_each_online_cpu(cpu)
2388 fcoe_percpu_thread_destroy(cpu);
2390 mutex_unlock(&fcoe_config_mutex);
2392 /* flush any asyncronous interface destroys,
2393 * this should happen after the netdev notifier is unregistered */
2394 flush_scheduled_work();
2395 /* That will flush out all the N_Ports on the hostlist, but now we
2396 * may have NPIV VN_Ports scheduled for destruction */
2397 flush_scheduled_work();
2399 /* detach from scsi transport
2400 * must happen after all destroys are done, therefor after the flush */
2403 module_exit(fcoe_exit);
2406 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
2407 * @seq: active sequence in the FLOGI or FDISC exchange
2408 * @fp: response frame, or error encoded in a pointer (timeout)
2409 * @arg: pointer the the fcoe_ctlr structure
2411 * This handles MAC address managment for FCoE, then passes control on to
2412 * the libfc FLOGI response handler.
2414 static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2416 struct fcoe_ctlr *fip = arg;
2417 struct fc_exch *exch = fc_seq_exch(seq);
2418 struct fc_lport *lport = exch->lp;
2424 mac = fr_cb(fp)->granted_mac;
2425 if (is_zero_ether_addr(mac)) {
2427 if (fcoe_ctlr_recv_flogi(fip, lport, fp)) {
2432 fcoe_update_src_mac(lport, mac);
2434 fc_lport_flogi_resp(seq, fp, lport);
2438 * fcoe_logo_resp() - FCoE specific LOGO response handler
2439 * @seq: active sequence in the LOGO exchange
2440 * @fp: response frame, or error encoded in a pointer (timeout)
2441 * @arg: pointer the the fcoe_ctlr structure
2443 * This handles MAC address managment for FCoE, then passes control on to
2444 * the libfc LOGO response handler.
2446 static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
2448 struct fc_lport *lport = arg;
2449 static u8 zero_mac[ETH_ALEN] = { 0 };
2452 fcoe_update_src_mac(lport, zero_mac);
2453 fc_lport_logo_resp(seq, fp, lport);
2457 * fcoe_elsct_send - FCoE specific ELS handler
2459 * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
2460 * using FCoE specific response handlers and passing the FIP controller as
2461 * the argument (the lport is still available from the exchange).
2463 * Most of the work here is just handed off to the libfc routine.
2465 static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
2466 struct fc_frame *fp, unsigned int op,
2467 void (*resp)(struct fc_seq *,
2470 void *arg, u32 timeout)
2472 struct fcoe_port *port = lport_priv(lport);
2473 struct fcoe_interface *fcoe = port->fcoe;
2474 struct fcoe_ctlr *fip = &fcoe->ctlr;
2475 struct fc_frame_header *fh = fc_frame_header_get(fp);
2480 return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
2483 /* only hook onto fabric logouts, not port logouts */
2484 if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
2486 return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
2489 return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
2493 * fcoe_vport_create() - create an fc_host/scsi_host for a vport
2494 * @vport: fc_vport object to create a new fc_host for
2495 * @disabled: start the new fc_host in a disabled state by default?
2497 * Returns: 0 for success
2499 static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
2501 struct Scsi_Host *shost = vport_to_shost(vport);
2502 struct fc_lport *n_port = shost_priv(shost);
2503 struct fcoe_port *port = lport_priv(n_port);
2504 struct fcoe_interface *fcoe = port->fcoe;
2505 struct net_device *netdev = fcoe->netdev;
2506 struct fc_lport *vn_port;
2508 mutex_lock(&fcoe_config_mutex);
2509 vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
2510 mutex_unlock(&fcoe_config_mutex);
2512 if (IS_ERR(vn_port)) {
2513 printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
2519 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2521 vn_port->boot_time = jiffies;
2522 fc_fabric_login(vn_port);
2523 fc_vport_setlink(vn_port);
2529 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
2530 * @vport: fc_vport object that is being destroyed
2532 * Returns: 0 for success
2534 static int fcoe_vport_destroy(struct fc_vport *vport)
2536 struct Scsi_Host *shost = vport_to_shost(vport);
2537 struct fc_lport *n_port = shost_priv(shost);
2538 struct fc_lport *vn_port = vport->dd_data;
2539 struct fcoe_port *port = lport_priv(vn_port);
2541 mutex_lock(&n_port->lp_mutex);
2542 list_del(&vn_port->list);
2543 mutex_unlock(&n_port->lp_mutex);
2544 schedule_work(&port->destroy_work);
2549 * fcoe_vport_disable() - change vport state
2550 * @vport: vport to bring online/offline
2551 * @disable: should the vport be disabled?
2553 static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
2555 struct fc_lport *lport = vport->dd_data;
2558 fc_vport_set_state(vport, FC_VPORT_DISABLED);
2559 fc_fabric_logoff(lport);
2561 lport->boot_time = jiffies;
2562 fc_fabric_login(lport);
2563 fc_vport_setlink(lport);
2570 * fcoe_vport_set_symbolic_name() - append vport string to symbolic name
2571 * @vport: fc_vport with a new symbolic name string
2573 * After generating a new symbolic name string, a new RSPN_ID request is
2574 * sent to the name server. There is no response handler, so if it fails
2575 * for some reason it will not be retried.
2577 static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
2579 struct fc_lport *lport = vport->dd_data;
2580 struct fc_frame *fp;
2583 snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
2584 "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
2585 fcoe_netdev(lport)->name, vport->symbolic_name);
2587 if (lport->state != LPORT_ST_READY)
2590 len = strnlen(fc_host_symbolic_name(lport->host), 255);
2591 fp = fc_frame_alloc(lport,
2592 sizeof(struct fc_ct_hdr) +
2593 sizeof(struct fc_ns_rspn) + len);
2596 lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
2597 NULL, NULL, 3 * lport->r_a_tov);
2601 * fcoe_get_lesb() - Fill the FCoE Link Error Status Block
2602 * @lport: the local port
2603 * @fc_lesb: the link error status block
2605 static void fcoe_get_lesb(struct fc_lport *lport,
2606 struct fc_els_lesb *fc_lesb)
2609 u32 lfc, vlfc, mdac;
2610 struct fcoe_dev_stats *devst;
2611 struct fcoe_fc_els_lesb *lesb;
2612 struct net_device *netdev = fcoe_netdev(lport);
2617 lesb = (struct fcoe_fc_els_lesb *)fc_lesb;
2618 memset(lesb, 0, sizeof(*lesb));
2619 for_each_possible_cpu(cpu) {
2620 devst = per_cpu_ptr(lport->dev_stats, cpu);
2621 lfc += devst->LinkFailureCount;
2622 vlfc += devst->VLinkFailureCount;
2623 mdac += devst->MissDiscAdvCount;
2625 lesb->lesb_link_fail = htonl(lfc);
2626 lesb->lesb_vlink_fail = htonl(vlfc);
2627 lesb->lesb_miss_fka = htonl(mdac);
2628 lesb->lesb_fcs_error = htonl(dev_get_stats(netdev)->rx_crc_errors);
2632 * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
2633 * @lport: the local port
2634 * @port_id: the port ID
2635 * @fp: the received frame, if any, that caused the port_id to be set.
2637 * This routine handles the case where we received a FLOGI and are
2638 * entering point-to-point mode. We need to call fcoe_ctlr_recv_flogi()
2639 * so it can set the non-mapped mode and gateway address.
2641 * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
2643 static void fcoe_set_port_id(struct fc_lport *lport,
2644 u32 port_id, struct fc_frame *fp)
2646 struct fcoe_port *port = lport_priv(lport);
2647 struct fcoe_interface *fcoe = port->fcoe;
2649 if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
2650 fcoe_ctlr_recv_flogi(&fcoe->ctlr, lport, fp);