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authorRobert Love <robert.w.love@intel.com>2008-12-09 18:10:24 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-29 12:24:33 -0500
commit85b4aa4926a50210b683ac89326e338e7d131211 (patch)
tree127b6586573194f2d37b5a298e12c8b7d24a6fac /drivers
parent42e9a92fe6a9095bd68a379aaec7ad2be0337f7a (diff)
[SCSI] fcoe: Fibre Channel over Ethernet
Encapsulation protocol for running Fibre Channel over Ethernet interfaces. Creates virtual Fibre Channel host adapters using libfc. This layer is the LLD to the scsi-ml. It allocates the Scsi_Host, utilizes libfc for Fibre Channel protocol processing and interacts with netdev to send/receive Ethernet packets. Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/Kconfig7
-rw-r--r--drivers/scsi/Makefile1
-rw-r--r--drivers/scsi/fcoe/Makefile8
-rw-r--r--drivers/scsi/fcoe/fc_transport_fcoe.c446
-rw-r--r--drivers/scsi/fcoe/fcoe_sw.c494
-rw-r--r--drivers/scsi/fcoe/libfcoe.c1510
6 files changed, 2466 insertions, 0 deletions
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 24d762aab7c5..673463e4bbf0 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -609,6 +609,13 @@ config LIBFC
609 ---help--- 609 ---help---
610 Fibre Channel library module 610 Fibre Channel library module
611 611
612config FCOE
613 tristate "FCoE module"
614 depends on SCSI
615 select LIBFC
616 ---help---
617 Fibre Channel over Ethernet module
618
612config SCSI_DMX3191D 619config SCSI_DMX3191D
613 tristate "DMX3191D SCSI support" 620 tristate "DMX3191D SCSI support"
614 depends on PCI && SCSI 621 depends on PCI && SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 87355f573d60..07d0f58de9bb 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_SCSI_SRP_ATTRS) += scsi_transport_srp.o
37obj-$(CONFIG_SCSI_DH) += device_handler/ 37obj-$(CONFIG_SCSI_DH) += device_handler/
38 38
39obj-$(CONFIG_LIBFC) += libfc/ 39obj-$(CONFIG_LIBFC) += libfc/
40obj-$(CONFIG_FCOE) += fcoe/
40obj-$(CONFIG_ISCSI_TCP) += libiscsi.o libiscsi_tcp.o iscsi_tcp.o 41obj-$(CONFIG_ISCSI_TCP) += libiscsi.o libiscsi_tcp.o iscsi_tcp.o
41obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o 42obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
42obj-$(CONFIG_SCSI_A4000T) += 53c700.o a4000t.o 43obj-$(CONFIG_SCSI_A4000T) += 53c700.o a4000t.o
diff --git a/drivers/scsi/fcoe/Makefile b/drivers/scsi/fcoe/Makefile
new file mode 100644
index 000000000000..b78da06d7c0e
--- /dev/null
+++ b/drivers/scsi/fcoe/Makefile
@@ -0,0 +1,8 @@
1# $Id: Makefile
2
3obj-$(CONFIG_FCOE) += fcoe.o
4
5fcoe-y := \
6 libfcoe.o \
7 fcoe_sw.o \
8 fc_transport_fcoe.o
diff --git a/drivers/scsi/fcoe/fc_transport_fcoe.c b/drivers/scsi/fcoe/fc_transport_fcoe.c
new file mode 100644
index 000000000000..bf7fe6fc0820
--- /dev/null
+++ b/drivers/scsi/fcoe/fc_transport_fcoe.c
@@ -0,0 +1,446 @@
1/*
2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20#include <linux/pci.h>
21#include <scsi/libfcoe.h>
22#include <scsi/fc_transport_fcoe.h>
23
24/* internal fcoe transport */
25struct fcoe_transport_internal {
26 struct fcoe_transport *t;
27 struct net_device *netdev;
28 struct list_head list;
29};
30
31/* fcoe transports list and its lock */
32static LIST_HEAD(fcoe_transports);
33static DEFINE_MUTEX(fcoe_transports_lock);
34
35/**
36 * fcoe_transport_default - returns ptr to the default transport fcoe_sw
37 **/
38struct fcoe_transport *fcoe_transport_default(void)
39{
40 return &fcoe_sw_transport;
41}
42
43/**
44 * fcoe_transport_to_pcidev - get the pci dev from a netdev
45 * @netdev: the netdev that pci dev will be retrived from
46 *
47 * Returns: NULL or the corrsponding pci_dev
48 **/
49struct pci_dev *fcoe_transport_pcidev(const struct net_device *netdev)
50{
51 if (!netdev->dev.parent)
52 return NULL;
53 return to_pci_dev(netdev->dev.parent);
54}
55
56/**
57 * fcoe_transport_device_lookup - find out netdev is managed by the
58 * transport
59 * assign a transport to a device
60 * @netdev: the netdev the transport to be attached to
61 *
62 * This will look for existing offload driver, if not found, it falls back to
63 * the default sw hba (fcoe_sw) as its fcoe transport.
64 *
65 * Returns: 0 for success
66 **/
67static struct fcoe_transport_internal *fcoe_transport_device_lookup(
68 struct fcoe_transport *t, struct net_device *netdev)
69{
70 struct fcoe_transport_internal *ti;
71
72 /* assign the transpor to this device */
73 mutex_lock(&t->devlock);
74 list_for_each_entry(ti, &t->devlist, list) {
75 if (ti->netdev == netdev) {
76 mutex_unlock(&t->devlock);
77 return ti;
78 }
79 }
80 mutex_unlock(&t->devlock);
81 return NULL;
82}
83/**
84 * fcoe_transport_device_add - assign a transport to a device
85 * @netdev: the netdev the transport to be attached to
86 *
87 * This will look for existing offload driver, if not found, it falls back to
88 * the default sw hba (fcoe_sw) as its fcoe transport.
89 *
90 * Returns: 0 for success
91 **/
92static int fcoe_transport_device_add(struct fcoe_transport *t,
93 struct net_device *netdev)
94{
95 struct fcoe_transport_internal *ti;
96
97 ti = fcoe_transport_device_lookup(t, netdev);
98 if (ti) {
99 printk(KERN_DEBUG "fcoe_transport_device_add:"
100 "device %s is already added to transport %s\n",
101 netdev->name, t->name);
102 return -EEXIST;
103 }
104 /* allocate an internal struct to host the netdev and the list */
105 ti = kzalloc(sizeof(*ti), GFP_KERNEL);
106 if (!ti)
107 return -ENOMEM;
108
109 ti->t = t;
110 ti->netdev = netdev;
111 INIT_LIST_HEAD(&ti->list);
112 dev_hold(ti->netdev);
113
114 mutex_lock(&t->devlock);
115 list_add(&ti->list, &t->devlist);
116 mutex_unlock(&t->devlock);
117
118 printk(KERN_DEBUG "fcoe_transport_device_add:"
119 "device %s added to transport %s\n",
120 netdev->name, t->name);
121
122 return 0;
123}
124
125/**
126 * fcoe_transport_device_remove - remove a device from its transport
127 * @netdev: the netdev the transport to be attached to
128 *
129 * this removes the device from the transport so the given transport will
130 * not manage this device any more
131 *
132 * Returns: 0 for success
133 **/
134static int fcoe_transport_device_remove(struct fcoe_transport *t,
135 struct net_device *netdev)
136{
137 struct fcoe_transport_internal *ti;
138
139 ti = fcoe_transport_device_lookup(t, netdev);
140 if (!ti) {
141 printk(KERN_DEBUG "fcoe_transport_device_remove:"
142 "device %s is not managed by transport %s\n",
143 netdev->name, t->name);
144 return -ENODEV;
145 }
146 mutex_lock(&t->devlock);
147 list_del(&ti->list);
148 mutex_unlock(&t->devlock);
149 printk(KERN_DEBUG "fcoe_transport_device_remove:"
150 "device %s removed from transport %s\n",
151 netdev->name, t->name);
152 dev_put(ti->netdev);
153 kfree(ti);
154 return 0;
155}
156
157/**
158 * fcoe_transport_device_remove_all - remove all from transport devlist
159 *
160 * this removes the device from the transport so the given transport will
161 * not manage this device any more
162 *
163 * Returns: 0 for success
164 **/
165static void fcoe_transport_device_remove_all(struct fcoe_transport *t)
166{
167 struct fcoe_transport_internal *ti, *tmp;
168
169 mutex_lock(&t->devlock);
170 list_for_each_entry_safe(ti, tmp, &t->devlist, list) {
171 list_del(&ti->list);
172 kfree(ti);
173 }
174 mutex_unlock(&t->devlock);
175}
176
177/**
178 * fcoe_transport_match - use the bus device match function to match the hw
179 * @t: the fcoe transport
180 * @netdev:
181 *
182 * This function is used to check if the givne transport wants to manage the
183 * input netdev. if the transports implements the match function, it will be
184 * called, o.w. we just compare the pci vendor and device id.
185 *
186 * Returns: true for match up
187 **/
188static bool fcoe_transport_match(struct fcoe_transport *t,
189 struct net_device *netdev)
190{
191 /* match transport by vendor and device id */
192 struct pci_dev *pci;
193
194 pci = fcoe_transport_pcidev(netdev);
195
196 if (pci) {
197 printk(KERN_DEBUG "fcoe_transport_match:"
198 "%s:%x:%x -- %s:%x:%x\n",
199 t->name, t->vendor, t->device,
200 netdev->name, pci->vendor, pci->device);
201
202 /* if transport supports match */
203 if (t->match)
204 return t->match(netdev);
205
206 /* else just compare the vendor and device id: pci only */
207 return (t->vendor == pci->vendor) && (t->device == pci->device);
208 }
209 return false;
210}
211
212/**
213 * fcoe_transport_lookup - check if the transport is already registered
214 * @t: the transport to be looked up
215 *
216 * This compares the parent device (pci) vendor and device id
217 *
218 * Returns: NULL if not found
219 *
220 * TODO - return default sw transport if no other transport is found
221 **/
222static struct fcoe_transport *fcoe_transport_lookup(
223 struct net_device *netdev)
224{
225 struct fcoe_transport *t;
226
227 mutex_lock(&fcoe_transports_lock);
228 list_for_each_entry(t, &fcoe_transports, list) {
229 if (fcoe_transport_match(t, netdev)) {
230 mutex_unlock(&fcoe_transports_lock);
231 return t;
232 }
233 }
234 mutex_unlock(&fcoe_transports_lock);
235
236 printk(KERN_DEBUG "fcoe_transport_lookup:"
237 "use default transport for %s\n", netdev->name);
238 return fcoe_transport_default();
239}
240
241/**
242 * fcoe_transport_register - adds a fcoe transport to the fcoe transports list
243 * @t: ptr to the fcoe transport to be added
244 *
245 * Returns: 0 for success
246 **/
247int fcoe_transport_register(struct fcoe_transport *t)
248{
249 struct fcoe_transport *tt;
250
251 /* TODO - add fcoe_transport specific initialization here */
252 mutex_lock(&fcoe_transports_lock);
253 list_for_each_entry(tt, &fcoe_transports, list) {
254 if (tt == t) {
255 mutex_unlock(&fcoe_transports_lock);
256 return -EEXIST;
257 }
258 }
259 list_add_tail(&t->list, &fcoe_transports);
260 mutex_unlock(&fcoe_transports_lock);
261
262 mutex_init(&t->devlock);
263 INIT_LIST_HEAD(&t->devlist);
264
265 printk(KERN_DEBUG "fcoe_transport_register:%s\n", t->name);
266
267 return 0;
268}
269EXPORT_SYMBOL_GPL(fcoe_transport_register);
270
271/**
272 * fcoe_transport_unregister - remove the tranport fro the fcoe transports list
273 * @t: ptr to the fcoe transport to be removed
274 *
275 * Returns: 0 for success
276 **/
277int fcoe_transport_unregister(struct fcoe_transport *t)
278{
279 struct fcoe_transport *tt, *tmp;
280
281 mutex_lock(&fcoe_transports_lock);
282 list_for_each_entry_safe(tt, tmp, &fcoe_transports, list) {
283 if (tt == t) {
284 list_del(&t->list);
285 mutex_unlock(&fcoe_transports_lock);
286 fcoe_transport_device_remove_all(t);
287 printk(KERN_DEBUG "fcoe_transport_unregister:%s\n",
288 t->name);
289 return 0;
290 }
291 }
292 mutex_unlock(&fcoe_transports_lock);
293 return -ENODEV;
294}
295EXPORT_SYMBOL_GPL(fcoe_transport_unregister);
296
297/*
298 * fcoe_load_transport_driver - load an offload driver by alias name
299 * @netdev: the target net device
300 *
301 * Requests for an offload driver module as the fcoe transport, if fails, it
302 * falls back to use the SW HBA (fcoe_sw) as its transport
303 *
304 * TODO -
305 * 1. supports only PCI device
306 * 2. needs fix for VLAn and bonding
307 * 3. pure hw fcoe hba may not have netdev
308 *
309 * Returns: 0 for success
310 **/
311int fcoe_load_transport_driver(struct net_device *netdev)
312{
313 struct pci_dev *pci;
314 struct device *dev = netdev->dev.parent;
315
316 if (fcoe_transport_lookup(netdev)) {
317 /* load default transport */
318 printk(KERN_DEBUG "fcoe: already loaded transport for %s\n",
319 netdev->name);
320 return -EEXIST;
321 }
322
323 pci = to_pci_dev(dev);
324 if (dev->bus != &pci_bus_type) {
325 printk(KERN_DEBUG "fcoe: support noly PCI device\n");
326 return -ENODEV;
327 }
328 printk(KERN_DEBUG "fcoe: loading driver fcoe-pci-0x%04x-0x%04x\n",
329 pci->vendor, pci->device);
330
331 return request_module("fcoe-pci-0x%04x-0x%04x",
332 pci->vendor, pci->device);
333
334}
335EXPORT_SYMBOL_GPL(fcoe_load_transport_driver);
336
337/**
338 * fcoe_transport_attach - load transport to fcoe
339 * @netdev: the netdev the transport to be attached to
340 *
341 * This will look for existing offload driver, if not found, it falls back to
342 * the default sw hba (fcoe_sw) as its fcoe transport.
343 *
344 * Returns: 0 for success
345 **/
346int fcoe_transport_attach(struct net_device *netdev)
347{
348 struct fcoe_transport *t;
349
350 /* find the corresponding transport */
351 t = fcoe_transport_lookup(netdev);
352 if (!t) {
353 printk(KERN_DEBUG "fcoe_transport_attach"
354 ":no transport for %s:use %s\n",
355 netdev->name, t->name);
356 return -ENODEV;
357 }
358 /* add to the transport */
359 if (fcoe_transport_device_add(t, netdev)) {
360 printk(KERN_DEBUG "fcoe_transport_attach"
361 ":failed to add %s to tramsport %s\n",
362 netdev->name, t->name);
363 return -EIO;
364 }
365 /* transport create function */
366 if (t->create)
367 t->create(netdev);
368
369 printk(KERN_DEBUG "fcoe_transport_attach:transport %s for %s\n",
370 t->name, netdev->name);
371 return 0;
372}
373EXPORT_SYMBOL_GPL(fcoe_transport_attach);
374
375/**
376 * fcoe_transport_release - unload transport from fcoe
377 * @netdev: the net device on which fcoe is to be released
378 *
379 * Returns: 0 for success
380 **/
381int fcoe_transport_release(struct net_device *netdev)
382{
383 struct fcoe_transport *t;
384
385 /* find the corresponding transport */
386 t = fcoe_transport_lookup(netdev);
387 if (!t) {
388 printk(KERN_DEBUG "fcoe_transport_release:"
389 "no transport for %s:use %s\n",
390 netdev->name, t->name);
391 return -ENODEV;
392 }
393 /* remove the device from the transport */
394 if (fcoe_transport_device_remove(t, netdev)) {
395 printk(KERN_DEBUG "fcoe_transport_release:"
396 "failed to add %s to tramsport %s\n",
397 netdev->name, t->name);
398 return -EIO;
399 }
400 /* transport destroy function */
401 if (t->destroy)
402 t->destroy(netdev);
403
404 printk(KERN_DEBUG "fcoe_transport_release:"
405 "device %s dettached from transport %s\n",
406 netdev->name, t->name);
407
408 return 0;
409}
410EXPORT_SYMBOL_GPL(fcoe_transport_release);
411
412/**
413 * fcoe_transport_init - initializes fcoe transport layer
414 *
415 * This prepares for the fcoe transport layer
416 *
417 * Returns: none
418 **/
419int __init fcoe_transport_init(void)
420{
421 INIT_LIST_HEAD(&fcoe_transports);
422 mutex_init(&fcoe_transports_lock);
423 return 0;
424}
425
426/**
427 * fcoe_transport_exit - cleans up the fcoe transport layer
428 * This cleans up the fcoe transport layer. removing any transport on the list,
429 * note that the transport destroy func is not called here.
430 *
431 * Returns: none
432 **/
433int __exit fcoe_transport_exit(void)
434{
435 struct fcoe_transport *t, *tmp;
436
437 mutex_lock(&fcoe_transports_lock);
438 list_for_each_entry_safe(t, tmp, &fcoe_transports, list) {
439 list_del(&t->list);
440 mutex_unlock(&fcoe_transports_lock);
441 fcoe_transport_device_remove_all(t);
442 mutex_lock(&fcoe_transports_lock);
443 }
444 mutex_unlock(&fcoe_transports_lock);
445 return 0;
446}
diff --git a/drivers/scsi/fcoe/fcoe_sw.c b/drivers/scsi/fcoe/fcoe_sw.c
new file mode 100644
index 000000000000..dc4cd5e25760
--- /dev/null
+++ b/drivers/scsi/fcoe/fcoe_sw.c
@@ -0,0 +1,494 @@
1/*
2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20#include <linux/module.h>
21#include <linux/version.h>
22#include <linux/kernel.h>
23#include <linux/pci.h>
24#include <linux/init.h>
25#include <linux/spinlock.h>
26#include <linux/netdevice.h>
27#include <linux/etherdevice.h>
28#include <linux/if_vlan.h>
29#include <net/rtnetlink.h>
30
31#include <scsi/fc/fc_els.h>
32#include <scsi/fc/fc_encaps.h>
33#include <scsi/fc/fc_fs.h>
34#include <scsi/scsi_transport.h>
35#include <scsi/scsi_transport_fc.h>
36
37#include <scsi/libfc.h>
38#include <scsi/libfcoe.h>
39#include <scsi/fc_transport_fcoe.h>
40
41#define FCOE_SW_VERSION "0.1"
42#define FCOE_SW_NAME "fcoesw"
43#define FCOE_SW_VENDOR "Open-FCoE.org"
44
45#define FCOE_MAX_LUN 255
46#define FCOE_MAX_FCP_TARGET 256
47
48#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
49
50#define FCOE_MIN_XID 0x0001 /* the min xid supported by fcoe_sw */
51#define FCOE_MAX_XID 0x07ef /* the max xid supported by fcoe_sw */
52
53static struct scsi_transport_template *scsi_transport_fcoe_sw;
54
55struct fc_function_template fcoe_sw_transport_function = {
56 .show_host_node_name = 1,
57 .show_host_port_name = 1,
58 .show_host_supported_classes = 1,
59 .show_host_supported_fc4s = 1,
60 .show_host_active_fc4s = 1,
61 .show_host_maxframe_size = 1,
62
63 .show_host_port_id = 1,
64 .show_host_supported_speeds = 1,
65 .get_host_speed = fc_get_host_speed,
66 .show_host_speed = 1,
67 .show_host_port_type = 1,
68 .get_host_port_state = fc_get_host_port_state,
69 .show_host_port_state = 1,
70 .show_host_symbolic_name = 1,
71
72 .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
73 .show_rport_maxframe_size = 1,
74 .show_rport_supported_classes = 1,
75
76 .show_host_fabric_name = 1,
77 .show_starget_node_name = 1,
78 .show_starget_port_name = 1,
79 .show_starget_port_id = 1,
80 .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
81 .show_rport_dev_loss_tmo = 1,
82 .get_fc_host_stats = fc_get_host_stats,
83 .issue_fc_host_lip = fcoe_reset,
84
85 .terminate_rport_io = fc_rport_terminate_io,
86};
87
88static struct scsi_host_template fcoe_sw_shost_template = {
89 .module = THIS_MODULE,
90 .name = "FCoE Driver",
91 .proc_name = FCOE_SW_NAME,
92 .queuecommand = fc_queuecommand,
93 .eh_abort_handler = fc_eh_abort,
94 .eh_device_reset_handler = fc_eh_device_reset,
95 .eh_host_reset_handler = fc_eh_host_reset,
96 .slave_alloc = fc_slave_alloc,
97 .change_queue_depth = fc_change_queue_depth,
98 .change_queue_type = fc_change_queue_type,
99 .this_id = -1,
100 .cmd_per_lun = 32,
101 .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
102 .use_clustering = ENABLE_CLUSTERING,
103 .sg_tablesize = SG_ALL,
104 .max_sectors = 0xffff,
105};
106
107/*
108 * fcoe_sw_lport_config - sets up the fc_lport
109 * @lp: ptr to the fc_lport
110 * @shost: ptr to the parent scsi host
111 *
112 * Returns: 0 for success
113 *
114 */
115static int fcoe_sw_lport_config(struct fc_lport *lp)
116{
117 int i = 0;
118
119 lp->link_status = 0;
120 lp->max_retry_count = 3;
121 lp->e_d_tov = 2 * 1000; /* FC-FS default */
122 lp->r_a_tov = 2 * 2 * 1000;
123 lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
124 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
125
126 /*
127 * allocate per cpu stats block
128 */
129 for_each_online_cpu(i)
130 lp->dev_stats[i] = kzalloc(sizeof(struct fcoe_dev_stats),
131 GFP_KERNEL);
132
133 /* lport fc_lport related configuration */
134 fc_lport_config(lp);
135
136 return 0;
137}
138
139/*
140 * fcoe_sw_netdev_config - sets up fcoe_softc for lport and network
141 * related properties
142 * @lp : ptr to the fc_lport
143 * @netdev : ptr to the associated netdevice struct
144 *
145 * Must be called after fcoe_sw_lport_config() as it will use lport mutex
146 *
147 * Returns : 0 for success
148 *
149 */
150static int fcoe_sw_netdev_config(struct fc_lport *lp, struct net_device *netdev)
151{
152 u32 mfs;
153 u64 wwnn, wwpn;
154 struct fcoe_softc *fc;
155 u8 flogi_maddr[ETH_ALEN];
156
157 /* Setup lport private data to point to fcoe softc */
158 fc = lport_priv(lp);
159 fc->lp = lp;
160 fc->real_dev = netdev;
161 fc->phys_dev = netdev;
162
163 /* Require support for get_pauseparam ethtool op. */
164 if (netdev->priv_flags & IFF_802_1Q_VLAN)
165 fc->phys_dev = vlan_dev_real_dev(netdev);
166
167 /* Do not support for bonding device */
168 if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
169 (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
170 (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
171 return -EOPNOTSUPP;
172 }
173
174 /*
175 * Determine max frame size based on underlying device and optional
176 * user-configured limit. If the MFS is too low, fcoe_link_ok()
177 * will return 0, so do this first.
178 */
179 mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
180 sizeof(struct fcoe_crc_eof));
181 if (fc_set_mfs(lp, mfs))
182 return -EINVAL;
183
184 lp->link_status = ~FC_PAUSE & ~FC_LINK_UP;
185 if (!fcoe_link_ok(lp))
186 lp->link_status |= FC_LINK_UP;
187
188 /* offload features support */
189 if (fc->real_dev->features & NETIF_F_SG)
190 lp->sg_supp = 1;
191
192
193 skb_queue_head_init(&fc->fcoe_pending_queue);
194
195 /* setup Source Mac Address */
196 memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr,
197 fc->real_dev->addr_len);
198
199 wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
200 fc_set_wwnn(lp, wwnn);
201 /* XXX - 3rd arg needs to be vlan id */
202 wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
203 fc_set_wwpn(lp, wwpn);
204
205 /*
206 * Add FCoE MAC address as second unicast MAC address
207 * or enter promiscuous mode if not capable of listening
208 * for multiple unicast MACs.
209 */
210 rtnl_lock();
211 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
212 dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN);
213 rtnl_unlock();
214
215 /*
216 * setup the receive function from ethernet driver
217 * on the ethertype for the given device
218 */
219 fc->fcoe_packet_type.func = fcoe_rcv;
220 fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
221 fc->fcoe_packet_type.dev = fc->real_dev;
222 dev_add_pack(&fc->fcoe_packet_type);
223
224 return 0;
225}
226
227/*
228 * fcoe_sw_shost_config - sets up fc_lport->host
229 * @lp : ptr to the fc_lport
230 * @shost : ptr to the associated scsi host
231 * @dev : device associated to scsi host
232 *
233 * Must be called after fcoe_sw_lport_config) and fcoe_sw_netdev_config()
234 *
235 * Returns : 0 for success
236 *
237 */
238static int fcoe_sw_shost_config(struct fc_lport *lp, struct Scsi_Host *shost,
239 struct device *dev)
240{
241 int rc = 0;
242
243 /* lport scsi host config */
244 lp->host = shost;
245
246 lp->host->max_lun = FCOE_MAX_LUN;
247 lp->host->max_id = FCOE_MAX_FCP_TARGET;
248 lp->host->max_channel = 0;
249 lp->host->transportt = scsi_transport_fcoe_sw;
250
251 /* add the new host to the SCSI-ml */
252 rc = scsi_add_host(lp->host, dev);
253 if (rc) {
254 FC_DBG("fcoe_sw_shost_config:error on scsi_add_host\n");
255 return rc;
256 }
257 sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
258 FCOE_SW_NAME, FCOE_SW_VERSION,
259 fcoe_netdev(lp)->name);
260
261 return 0;
262}
263
264/*
265 * fcoe_sw_em_config - allocates em for this lport
266 * @lp: the port that em is to allocated for
267 *
268 * Returns : 0 on success
269 */
270static inline int fcoe_sw_em_config(struct fc_lport *lp)
271{
272 BUG_ON(lp->emp);
273
274 lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3,
275 FCOE_MIN_XID, FCOE_MAX_XID);
276 if (!lp->emp)
277 return -ENOMEM;
278
279 return 0;
280}
281
282/*
283 * fcoe_sw_destroy - FCoE software HBA tear-down function
284 * @netdev: ptr to the associated net_device
285 *
286 * Returns: 0 if link is OK for use by FCoE.
287 */
288static int fcoe_sw_destroy(struct net_device *netdev)
289{
290 int cpu;
291 struct fc_lport *lp = NULL;
292 struct fcoe_softc *fc;
293 u8 flogi_maddr[ETH_ALEN];
294
295 BUG_ON(!netdev);
296
297 printk(KERN_DEBUG "fcoe_sw_destroy:interface on %s\n",
298 netdev->name);
299
300 lp = fcoe_hostlist_lookup(netdev);
301 if (!lp)
302 return -ENODEV;
303
304 fc = fcoe_softc(lp);
305
306 /* Logout of the fabric */
307 fc_fabric_logoff(lp);
308
309 /* Remove the instance from fcoe's list */
310 fcoe_hostlist_remove(lp);
311
312 /* Don't listen for Ethernet packets anymore */
313 dev_remove_pack(&fc->fcoe_packet_type);
314
315 /* Cleanup the fc_lport */
316 fc_lport_destroy(lp);
317 fc_fcp_destroy(lp);
318
319 /* Detach from the scsi-ml */
320 fc_remove_host(lp->host);
321 scsi_remove_host(lp->host);
322
323 /* There are no more rports or I/O, free the EM */
324 if (lp->emp)
325 fc_exch_mgr_free(lp->emp);
326
327 /* Delete secondary MAC addresses */
328 rtnl_lock();
329 memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
330 dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN);
331 if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
332 dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN);
333 rtnl_unlock();
334
335 /* Free the per-CPU revieve threads */
336 fcoe_percpu_clean(lp);
337
338 /* Free existing skbs */
339 fcoe_clean_pending_queue(lp);
340
341 /* Free memory used by statistical counters */
342 for_each_online_cpu(cpu)
343 kfree(lp->dev_stats[cpu]);
344
345 /* Release the net_device and Scsi_Host */
346 dev_put(fc->real_dev);
347 scsi_host_put(lp->host);
348
349 return 0;
350}
351
352static struct libfc_function_template fcoe_sw_libfc_fcn_templ = {
353 .frame_send = fcoe_xmit,
354};
355
356/*
357 * fcoe_sw_create - this function creates the fcoe interface
358 * @netdev: pointer the associated netdevice
359 *
360 * Creates fc_lport struct and scsi_host for lport, configures lport
361 * and starts fabric login.
362 *
363 * Returns : 0 on success
364 */
365static int fcoe_sw_create(struct net_device *netdev)
366{
367 int rc;
368 struct fc_lport *lp = NULL;
369 struct fcoe_softc *fc;
370 struct Scsi_Host *shost;
371
372 BUG_ON(!netdev);
373
374 printk(KERN_DEBUG "fcoe_sw_create:interface on %s\n",
375 netdev->name);
376
377 lp = fcoe_hostlist_lookup(netdev);
378 if (lp)
379 return -EEXIST;
380
381 shost = fcoe_host_alloc(&fcoe_sw_shost_template,
382 sizeof(struct fcoe_softc));
383 if (!shost) {
384 FC_DBG("Could not allocate host structure\n");
385 return -ENOMEM;
386 }
387 lp = shost_priv(shost);
388 fc = lport_priv(lp);
389
390 /* configure fc_lport, e.g., em */
391 rc = fcoe_sw_lport_config(lp);
392 if (rc) {
393 FC_DBG("Could not configure lport\n");
394 goto out_host_put;
395 }
396
397 /* configure lport network properties */
398 rc = fcoe_sw_netdev_config(lp, netdev);
399 if (rc) {
400 FC_DBG("Could not configure netdev for lport\n");
401 goto out_host_put;
402 }
403
404 /* configure lport scsi host properties */
405 rc = fcoe_sw_shost_config(lp, shost, &netdev->dev);
406 if (rc) {
407 FC_DBG("Could not configure shost for lport\n");
408 goto out_host_put;
409 }
410
411 /* lport exch manager allocation */
412 rc = fcoe_sw_em_config(lp);
413 if (rc) {
414 FC_DBG("Could not configure em for lport\n");
415 goto out_host_put;
416 }
417
418 /* Initialize the library */
419 rc = fcoe_libfc_config(lp, &fcoe_sw_libfc_fcn_templ);
420 if (rc) {
421 FC_DBG("Could not configure libfc for lport!\n");
422 goto out_lp_destroy;
423 }
424
425 /* add to lports list */
426 fcoe_hostlist_add(lp);
427
428 lp->boot_time = jiffies;
429
430 fc_fabric_login(lp);
431
432 dev_hold(netdev);
433
434 return rc;
435
436out_lp_destroy:
437 fc_exch_mgr_free(lp->emp); /* Free the EM */
438out_host_put:
439 scsi_host_put(lp->host);
440 return rc;
441}
442
443/*
444 * fcoe_sw_match - the fcoe sw transport match function
445 *
446 * Returns : false always
447 */
448static bool fcoe_sw_match(struct net_device *netdev)
449{
450 /* FIXME - for sw transport, always return false */
451 return false;
452}
453
454/* the sw hba fcoe transport */
455struct fcoe_transport fcoe_sw_transport = {
456 .name = "fcoesw",
457 .create = fcoe_sw_create,
458 .destroy = fcoe_sw_destroy,
459 .match = fcoe_sw_match,
460 .vendor = 0x0,
461 .device = 0xffff,
462};
463
464/*
465 * fcoe_sw_init - registers fcoe_sw_transport
466 *
467 * Returns : 0 on success
468 */
469int __init fcoe_sw_init(void)
470{
471 /* attach to scsi transport */
472 scsi_transport_fcoe_sw =
473 fc_attach_transport(&fcoe_sw_transport_function);
474 if (!scsi_transport_fcoe_sw) {
475 printk(KERN_ERR "fcoe_sw_init:fc_attach_transport() failed\n");
476 return -ENODEV;
477 }
478 /* register sw transport */
479 fcoe_transport_register(&fcoe_sw_transport);
480 return 0;
481}
482
483/*
484 * fcoe_sw_exit - unregisters fcoe_sw_transport
485 *
486 * Returns : 0 on success
487 */
488int __exit fcoe_sw_exit(void)
489{
490 /* dettach the transport */
491 fc_release_transport(scsi_transport_fcoe_sw);
492 fcoe_transport_unregister(&fcoe_sw_transport);
493 return 0;
494}
diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
new file mode 100644
index 000000000000..1cb549c4fac4
--- /dev/null
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -0,0 +1,1510 @@
1/*
2 * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
16 *
17 * Maintained at www.Open-FCoE.org
18 */
19
20#include <linux/module.h>
21#include <linux/version.h>
22#include <linux/kernel.h>
23#include <linux/spinlock.h>
24#include <linux/skbuff.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/ethtool.h>
28#include <linux/if_ether.h>
29#include <linux/if_vlan.h>
30#include <linux/kthread.h>
31#include <linux/crc32.h>
32#include <linux/cpu.h>
33#include <linux/fs.h>
34#include <linux/sysfs.h>
35#include <linux/ctype.h>
36#include <scsi/scsi_tcq.h>
37#include <scsi/scsicam.h>
38#include <scsi/scsi_transport.h>
39#include <scsi/scsi_transport_fc.h>
40#include <net/rtnetlink.h>
41
42#include <scsi/fc/fc_encaps.h>
43
44#include <scsi/libfc.h>
45#include <scsi/fc_frame.h>
46#include <scsi/libfcoe.h>
47#include <scsi/fc_transport_fcoe.h>
48
49static int debug_fcoe;
50
51#define FCOE_MAX_QUEUE_DEPTH 256
52
53/* destination address mode */
54#define FCOE_GW_ADDR_MODE 0x00
55#define FCOE_FCOUI_ADDR_MODE 0x01
56
57#define FCOE_WORD_TO_BYTE 4
58
59MODULE_AUTHOR("Open-FCoE.org");
60MODULE_DESCRIPTION("FCoE");
61MODULE_LICENSE("GPL");
62
63/* fcoe host list */
64LIST_HEAD(fcoe_hostlist);
65DEFINE_RWLOCK(fcoe_hostlist_lock);
66DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
67struct fcoe_percpu_s *fcoe_percpu[NR_CPUS];
68
69
70/* Function Prototyes */
71static int fcoe_check_wait_queue(struct fc_lport *);
72static void fcoe_insert_wait_queue_head(struct fc_lport *, struct sk_buff *);
73static void fcoe_insert_wait_queue(struct fc_lport *, struct sk_buff *);
74static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
75#ifdef CONFIG_HOTPLUG_CPU
76static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
77#endif /* CONFIG_HOTPLUG_CPU */
78static int fcoe_device_notification(struct notifier_block *, ulong, void *);
79static void fcoe_dev_setup(void);
80static void fcoe_dev_cleanup(void);
81
82/* notification function from net device */
83static struct notifier_block fcoe_notifier = {
84 .notifier_call = fcoe_device_notification,
85};
86
87
88#ifdef CONFIG_HOTPLUG_CPU
89static struct notifier_block fcoe_cpu_notifier = {
90 .notifier_call = fcoe_cpu_callback,
91};
92
93/**
94 * fcoe_create_percpu_data - creates the associated cpu data
95 * @cpu: index for the cpu where fcoe cpu data will be created
96 *
97 * create percpu stats block, from cpu add notifier
98 *
99 * Returns: none
100 **/
101static void fcoe_create_percpu_data(int cpu)
102{
103 struct fc_lport *lp;
104 struct fcoe_softc *fc;
105
106 write_lock_bh(&fcoe_hostlist_lock);
107 list_for_each_entry(fc, &fcoe_hostlist, list) {
108 lp = fc->lp;
109 if (lp->dev_stats[cpu] == NULL)
110 lp->dev_stats[cpu] =
111 kzalloc(sizeof(struct fcoe_dev_stats),
112 GFP_KERNEL);
113 }
114 write_unlock_bh(&fcoe_hostlist_lock);
115}
116
117/**
118 * fcoe_destroy_percpu_data - destroys the associated cpu data
119 * @cpu: index for the cpu where fcoe cpu data will destroyed
120 *
121 * destroy percpu stats block called by cpu add/remove notifier
122 *
123 * Retuns: none
124 **/
125static void fcoe_destroy_percpu_data(int cpu)
126{
127 struct fc_lport *lp;
128 struct fcoe_softc *fc;
129
130 write_lock_bh(&fcoe_hostlist_lock);
131 list_for_each_entry(fc, &fcoe_hostlist, list) {
132 lp = fc->lp;
133 kfree(lp->dev_stats[cpu]);
134 lp->dev_stats[cpu] = NULL;
135 }
136 write_unlock_bh(&fcoe_hostlist_lock);
137}
138
139/**
140 * fcoe_cpu_callback - fcoe cpu hotplug event callback
141 * @nfb: callback data block
142 * @action: event triggering the callback
143 * @hcpu: index for the cpu of this event
144 *
145 * this creates or destroys per cpu data for fcoe
146 *
147 * Returns NOTIFY_OK always.
148 **/
149static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action,
150 void *hcpu)
151{
152 unsigned int cpu = (unsigned long)hcpu;
153
154 switch (action) {
155 case CPU_ONLINE:
156 fcoe_create_percpu_data(cpu);
157 break;
158 case CPU_DEAD:
159 fcoe_destroy_percpu_data(cpu);
160 break;
161 default:
162 break;
163 }
164 return NOTIFY_OK;
165}
166#endif /* CONFIG_HOTPLUG_CPU */
167
168/**
169 * foce_rcv - this is the fcoe receive function called by NET_RX_SOFTIRQ
170 * @skb: the receive skb
171 * @dev: associated net device
172 * @ptype: context
173 * @odldev: last device
174 *
175 * this function will receive the packet and build fc frame and pass it up
176 *
177 * Returns: 0 for success
178 **/
179int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
180 struct packet_type *ptype, struct net_device *olddev)
181{
182 struct fc_lport *lp;
183 struct fcoe_rcv_info *fr;
184 struct fcoe_softc *fc;
185 struct fcoe_dev_stats *stats;
186 struct fc_frame_header *fh;
187 unsigned short oxid;
188 int cpu_idx;
189 struct fcoe_percpu_s *fps;
190
191 fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
192 lp = fc->lp;
193 if (unlikely(lp == NULL)) {
194 FC_DBG("cannot find hba structure");
195 goto err2;
196 }
197
198 if (unlikely(debug_fcoe)) {
199 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
200 "end:%p sum:%d dev:%s", skb->len, skb->data_len,
201 skb->head, skb->data, skb_tail_pointer(skb),
202 skb_end_pointer(skb), skb->csum,
203 skb->dev ? skb->dev->name : "<NULL>");
204
205 }
206
207 /* check for FCOE packet type */
208 if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
209 FC_DBG("wrong FC type frame");
210 goto err;
211 }
212
213 /*
214 * Check for minimum frame length, and make sure required FCoE
215 * and FC headers are pulled into the linear data area.
216 */
217 if (unlikely((skb->len < FCOE_MIN_FRAME) ||
218 !pskb_may_pull(skb, FCOE_HEADER_LEN)))
219 goto err;
220
221 skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
222 fh = (struct fc_frame_header *) skb_transport_header(skb);
223
224 oxid = ntohs(fh->fh_ox_id);
225
226 fr = fcoe_dev_from_skb(skb);
227 fr->fr_dev = lp;
228 fr->ptype = ptype;
229 cpu_idx = 0;
230#ifdef CONFIG_SMP
231 /*
232 * The incoming frame exchange id(oxid) is ANDed with num of online
233 * cpu bits to get cpu_idx and then this cpu_idx is used for selecting
234 * a per cpu kernel thread from fcoe_percpu. In case the cpu is
235 * offline or no kernel thread for derived cpu_idx then cpu_idx is
236 * initialize to first online cpu index.
237 */
238 cpu_idx = oxid & (num_online_cpus() - 1);
239 if (!fcoe_percpu[cpu_idx] || !cpu_online(cpu_idx))
240 cpu_idx = first_cpu(cpu_online_map);
241#endif
242 fps = fcoe_percpu[cpu_idx];
243
244 spin_lock_bh(&fps->fcoe_rx_list.lock);
245 __skb_queue_tail(&fps->fcoe_rx_list, skb);
246 if (fps->fcoe_rx_list.qlen == 1)
247 wake_up_process(fps->thread);
248
249 spin_unlock_bh(&fps->fcoe_rx_list.lock);
250
251 return 0;
252err:
253#ifdef CONFIG_SMP
254 stats = lp->dev_stats[smp_processor_id()];
255#else
256 stats = lp->dev_stats[0];
257#endif
258 if (stats)
259 stats->ErrorFrames++;
260
261err2:
262 kfree_skb(skb);
263 return -1;
264}
265EXPORT_SYMBOL_GPL(fcoe_rcv);
266
267/**
268 * fcoe_start_io - pass to netdev to start xmit for fcoe
269 * @skb: the skb to be xmitted
270 *
271 * Returns: 0 for success
272 **/
273static inline int fcoe_start_io(struct sk_buff *skb)
274{
275 int rc;
276
277 skb_get(skb);
278 rc = dev_queue_xmit(skb);
279 if (rc != 0)
280 return rc;
281 kfree_skb(skb);
282 return 0;
283}
284
285/**
286 * fcoe_get_paged_crc_eof - in case we need alloc a page for crc_eof
287 * @skb: the skb to be xmitted
288 * @tlen: total len
289 *
290 * Returns: 0 for success
291 **/
292static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
293{
294 struct fcoe_percpu_s *fps;
295 struct page *page;
296 int cpu_idx;
297
298 cpu_idx = get_cpu();
299 fps = fcoe_percpu[cpu_idx];
300 page = fps->crc_eof_page;
301 if (!page) {
302 page = alloc_page(GFP_ATOMIC);
303 if (!page) {
304 put_cpu();
305 return -ENOMEM;
306 }
307 fps->crc_eof_page = page;
308 WARN_ON(fps->crc_eof_offset != 0);
309 }
310
311 get_page(page);
312 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
313 fps->crc_eof_offset, tlen);
314 skb->len += tlen;
315 skb->data_len += tlen;
316 skb->truesize += tlen;
317 fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
318
319 if (fps->crc_eof_offset >= PAGE_SIZE) {
320 fps->crc_eof_page = NULL;
321 fps->crc_eof_offset = 0;
322 put_page(page);
323 }
324 put_cpu();
325 return 0;
326}
327
328/**
329 * fcoe_fc_crc - calculates FC CRC in this fcoe skb
330 * @fp: the fc_frame containg data to be checksummed
331 *
332 * This uses crc32() to calculate the crc for fc frame
333 * Return : 32 bit crc
334 *
335 **/
336u32 fcoe_fc_crc(struct fc_frame *fp)
337{
338 struct sk_buff *skb = fp_skb(fp);
339 struct skb_frag_struct *frag;
340 unsigned char *data;
341 unsigned long off, len, clen;
342 u32 crc;
343 unsigned i;
344
345 crc = crc32(~0, skb->data, skb_headlen(skb));
346
347 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
348 frag = &skb_shinfo(skb)->frags[i];
349 off = frag->page_offset;
350 len = frag->size;
351 while (len > 0) {
352 clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
353 data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
354 KM_SKB_DATA_SOFTIRQ);
355 crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
356 kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
357 off += clen;
358 len -= clen;
359 }
360 }
361 return crc;
362}
363EXPORT_SYMBOL_GPL(fcoe_fc_crc);
364
365/**
366 * fcoe_xmit - FCoE frame transmit function
367 * @lp: the associated local port
368 * @fp: the fc_frame to be transmitted
369 *
370 * Return : 0 for success
371 *
372 **/
373int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
374{
375 int wlen, rc = 0;
376 u32 crc;
377 struct ethhdr *eh;
378 struct fcoe_crc_eof *cp;
379 struct sk_buff *skb;
380 struct fcoe_dev_stats *stats;
381 struct fc_frame_header *fh;
382 unsigned int hlen; /* header length implies the version */
383 unsigned int tlen; /* trailer length */
384 unsigned int elen; /* eth header, may include vlan */
385 int flogi_in_progress = 0;
386 struct fcoe_softc *fc;
387 u8 sof, eof;
388 struct fcoe_hdr *hp;
389
390 WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
391
392 fc = fcoe_softc(lp);
393 /*
394 * if it is a flogi then we need to learn gw-addr
395 * and my own fcid
396 */
397 fh = fc_frame_header_get(fp);
398 if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
399 if (fc_frame_payload_op(fp) == ELS_FLOGI) {
400 fc->flogi_oxid = ntohs(fh->fh_ox_id);
401 fc->address_mode = FCOE_FCOUI_ADDR_MODE;
402 fc->flogi_progress = 1;
403 flogi_in_progress = 1;
404 } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
405 /*
406 * Here we must've gotten an SID by accepting an FLOGI
407 * from a point-to-point connection. Switch to using
408 * the source mac based on the SID. The destination
409 * MAC in this case would have been set by receving the
410 * FLOGI.
411 */
412 fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
413 fc->flogi_progress = 0;
414 }
415 }
416
417 skb = fp_skb(fp);
418 sof = fr_sof(fp);
419 eof = fr_eof(fp);
420
421 elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
422 sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr);
423 hlen = sizeof(struct fcoe_hdr);
424 tlen = sizeof(struct fcoe_crc_eof);
425 wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
426
427 /* crc offload */
428 if (likely(lp->crc_offload)) {
429 skb->ip_summed = CHECKSUM_COMPLETE;
430 skb->csum_start = skb_headroom(skb);
431 skb->csum_offset = skb->len;
432 crc = 0;
433 } else {
434 skb->ip_summed = CHECKSUM_NONE;
435 crc = fcoe_fc_crc(fp);
436 }
437
438 /* copy fc crc and eof to the skb buff */
439 if (skb_is_nonlinear(skb)) {
440 skb_frag_t *frag;
441 if (fcoe_get_paged_crc_eof(skb, tlen)) {
442 kfree(skb);
443 return -ENOMEM;
444 }
445 frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
446 cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
447 + frag->page_offset;
448 } else {
449 cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
450 }
451
452 memset(cp, 0, sizeof(*cp));
453 cp->fcoe_eof = eof;
454 cp->fcoe_crc32 = cpu_to_le32(~crc);
455
456 if (skb_is_nonlinear(skb)) {
457 kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
458 cp = NULL;
459 }
460
461 /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
462 skb_push(skb, elen + hlen);
463 skb_reset_mac_header(skb);
464 skb_reset_network_header(skb);
465 skb->mac_len = elen;
466 skb->protocol = htons(ETH_P_802_3);
467 skb->dev = fc->real_dev;
468
469 /* fill up mac and fcoe headers */
470 eh = eth_hdr(skb);
471 eh->h_proto = htons(ETH_P_FCOE);
472 if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
473 fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
474 else
475 /* insert GW address */
476 memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
477
478 if (unlikely(flogi_in_progress))
479 memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
480 else
481 memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
482
483 hp = (struct fcoe_hdr *)(eh + 1);
484 memset(hp, 0, sizeof(*hp));
485 if (FC_FCOE_VER)
486 FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
487 hp->fcoe_sof = sof;
488
489 /* update tx stats: regardless if LLD fails */
490 stats = lp->dev_stats[smp_processor_id()];
491 if (stats) {
492 stats->TxFrames++;
493 stats->TxWords += wlen;
494 }
495
496 /* send down to lld */
497 fr_dev(fp) = lp;
498 if (fc->fcoe_pending_queue.qlen)
499 rc = fcoe_check_wait_queue(lp);
500
501 if (rc == 0)
502 rc = fcoe_start_io(skb);
503
504 if (rc) {
505 fcoe_insert_wait_queue(lp, skb);
506 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
507 fc_pause(lp);
508 }
509
510 return 0;
511}
512EXPORT_SYMBOL_GPL(fcoe_xmit);
513
514/*
515 * fcoe_percpu_receive_thread - recv thread per cpu
516 * @arg: ptr to the fcoe per cpu struct
517 *
518 * Return: 0 for success
519 *
520 */
521int fcoe_percpu_receive_thread(void *arg)
522{
523 struct fcoe_percpu_s *p = arg;
524 u32 fr_len;
525 struct fc_lport *lp;
526 struct fcoe_rcv_info *fr;
527 struct fcoe_dev_stats *stats;
528 struct fc_frame_header *fh;
529 struct sk_buff *skb;
530 struct fcoe_crc_eof crc_eof;
531 struct fc_frame *fp;
532 u8 *mac = NULL;
533 struct fcoe_softc *fc;
534 struct fcoe_hdr *hp;
535
536 set_user_nice(current, 19);
537
538 while (!kthread_should_stop()) {
539
540 spin_lock_bh(&p->fcoe_rx_list.lock);
541 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
542 set_current_state(TASK_INTERRUPTIBLE);
543 spin_unlock_bh(&p->fcoe_rx_list.lock);
544 schedule();
545 set_current_state(TASK_RUNNING);
546 if (kthread_should_stop())
547 return 0;
548 spin_lock_bh(&p->fcoe_rx_list.lock);
549 }
550 spin_unlock_bh(&p->fcoe_rx_list.lock);
551 fr = fcoe_dev_from_skb(skb);
552 lp = fr->fr_dev;
553 if (unlikely(lp == NULL)) {
554 FC_DBG("invalid HBA Structure");
555 kfree_skb(skb);
556 continue;
557 }
558
559 stats = lp->dev_stats[smp_processor_id()];
560
561 if (unlikely(debug_fcoe)) {
562 FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
563 "tail:%p end:%p sum:%d dev:%s",
564 skb->len, skb->data_len,
565 skb->head, skb->data, skb_tail_pointer(skb),
566 skb_end_pointer(skb), skb->csum,
567 skb->dev ? skb->dev->name : "<NULL>");
568 }
569
570 /*
571 * Save source MAC address before discarding header.
572 */
573 fc = lport_priv(lp);
574 if (unlikely(fc->flogi_progress))
575 mac = eth_hdr(skb)->h_source;
576
577 if (skb_is_nonlinear(skb))
578 skb_linearize(skb); /* not ideal */
579
580 /*
581 * Frame length checks and setting up the header pointers
582 * was done in fcoe_rcv already.
583 */
584 hp = (struct fcoe_hdr *) skb_network_header(skb);
585 fh = (struct fc_frame_header *) skb_transport_header(skb);
586
587 if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
588 if (stats) {
589 if (stats->ErrorFrames < 5)
590 FC_DBG("unknown FCoE version %x",
591 FC_FCOE_DECAPS_VER(hp));
592 stats->ErrorFrames++;
593 }
594 kfree_skb(skb);
595 continue;
596 }
597
598 skb_pull(skb, sizeof(struct fcoe_hdr));
599 fr_len = skb->len - sizeof(struct fcoe_crc_eof);
600
601 if (stats) {
602 stats->RxFrames++;
603 stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
604 }
605
606 fp = (struct fc_frame *)skb;
607 fc_frame_init(fp);
608 fr_dev(fp) = lp;
609 fr_sof(fp) = hp->fcoe_sof;
610
611 /* Copy out the CRC and EOF trailer for access */
612 if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
613 kfree_skb(skb);
614 continue;
615 }
616 fr_eof(fp) = crc_eof.fcoe_eof;
617 fr_crc(fp) = crc_eof.fcoe_crc32;
618 if (pskb_trim(skb, fr_len)) {
619 kfree_skb(skb);
620 continue;
621 }
622
623 /*
624 * We only check CRC if no offload is available and if it is
625 * it's solicited data, in which case, the FCP layer would
626 * check it during the copy.
627 */
628 if (lp->crc_offload)
629 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
630 else
631 fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
632
633 fh = fc_frame_header_get(fp);
634 if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
635 fh->fh_type == FC_TYPE_FCP) {
636 fc_exch_recv(lp, lp->emp, fp);
637 continue;
638 }
639 if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
640 if (le32_to_cpu(fr_crc(fp)) !=
641 ~crc32(~0, skb->data, fr_len)) {
642 if (debug_fcoe || stats->InvalidCRCCount < 5)
643 printk(KERN_WARNING "fcoe: dropping "
644 "frame with CRC error\n");
645 stats->InvalidCRCCount++;
646 stats->ErrorFrames++;
647 fc_frame_free(fp);
648 continue;
649 }
650 fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
651 }
652 /* non flogi and non data exchanges are handled here */
653 if (unlikely(fc->flogi_progress))
654 fcoe_recv_flogi(fc, fp, mac);
655 fc_exch_recv(lp, lp->emp, fp);
656 }
657 return 0;
658}
659
660/**
661 * fcoe_recv_flogi - flogi receive function
662 * @fc: associated fcoe_softc
663 * @fp: the recieved frame
664 * @sa: the source address of this flogi
665 *
666 * This is responsible to parse the flogi response and sets the corresponding
667 * mac address for the initiator, eitehr OUI based or GW based.
668 *
669 * Returns: none
670 **/
671static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
672{
673 struct fc_frame_header *fh;
674 u8 op;
675
676 fh = fc_frame_header_get(fp);
677 if (fh->fh_type != FC_TYPE_ELS)
678 return;
679 op = fc_frame_payload_op(fp);
680 if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
681 fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
682 /*
683 * FLOGI accepted.
684 * If the src mac addr is FC_OUI-based, then we mark the
685 * address_mode flag to use FC_OUI-based Ethernet DA.
686 * Otherwise we use the FCoE gateway addr
687 */
688 if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
689 fc->address_mode = FCOE_FCOUI_ADDR_MODE;
690 } else {
691 memcpy(fc->dest_addr, sa, ETH_ALEN);
692 fc->address_mode = FCOE_GW_ADDR_MODE;
693 }
694
695 /*
696 * Remove any previously-set unicast MAC filter.
697 * Add secondary FCoE MAC address filter for our OUI.
698 */
699 rtnl_lock();
700 if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
701 dev_unicast_delete(fc->real_dev, fc->data_src_addr,
702 ETH_ALEN);
703 fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
704 dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
705 rtnl_unlock();
706
707 fc->flogi_progress = 0;
708 } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
709 /*
710 * Save source MAC for point-to-point responses.
711 */
712 memcpy(fc->dest_addr, sa, ETH_ALEN);
713 fc->address_mode = FCOE_GW_ADDR_MODE;
714 }
715}
716
717/**
718 * fcoe_watchdog - fcoe timer callback
719 * @vp:
720 *
721 * This checks the pending queue length for fcoe and put fcoe to be paused state
722 * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
723 * fcoe_hostlist.
724 *
725 * Returns: 0 for success
726 **/
727void fcoe_watchdog(ulong vp)
728{
729 struct fc_lport *lp;
730 struct fcoe_softc *fc;
731 int paused = 0;
732
733 read_lock(&fcoe_hostlist_lock);
734 list_for_each_entry(fc, &fcoe_hostlist, list) {
735 lp = fc->lp;
736 if (lp) {
737 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
738 paused = 1;
739 if (fcoe_check_wait_queue(lp) < FCOE_MAX_QUEUE_DEPTH) {
740 if (paused)
741 fc_unpause(lp);
742 }
743 }
744 }
745 read_unlock(&fcoe_hostlist_lock);
746
747 fcoe_timer.expires = jiffies + (1 * HZ);
748 add_timer(&fcoe_timer);
749}
750
751
752/**
753 * fcoe_check_wait_queue - put the skb into fcoe pending xmit queue
754 * @lp: the fc_port for this skb
755 * @skb: the associated skb to be xmitted
756 *
757 * This empties the wait_queue, dequeue the head of the wait_queue queue
758 * and calls fcoe_start_io() for each packet, if all skb have been
759 * transmitted, return 0 if a error occurs, then restore wait_queue and
760 * try again later.
761 *
762 * The wait_queue is used when the skb transmit fails. skb will go
763 * in the wait_queue which will be emptied by the time function OR
764 * by the next skb transmit.
765 *
766 * Returns: 0 for success
767 **/
768static int fcoe_check_wait_queue(struct fc_lport *lp)
769{
770 int rc, unpause = 0;
771 int paused = 0;
772 struct sk_buff *skb;
773 struct fcoe_softc *fc;
774
775 fc = fcoe_softc(lp);
776 spin_lock_bh(&fc->fcoe_pending_queue.lock);
777
778 /*
779 * is this interface paused?
780 */
781 if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
782 paused = 1;
783 if (fc->fcoe_pending_queue.qlen) {
784 while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
785 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
786 rc = fcoe_start_io(skb);
787 if (rc) {
788 fcoe_insert_wait_queue_head(lp, skb);
789 return rc;
790 }
791 spin_lock_bh(&fc->fcoe_pending_queue.lock);
792 }
793 if (fc->fcoe_pending_queue.qlen < FCOE_MAX_QUEUE_DEPTH)
794 unpause = 1;
795 }
796 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
797 if ((unpause) && (paused))
798 fc_unpause(lp);
799 return fc->fcoe_pending_queue.qlen;
800}
801
802/**
803 * fcoe_insert_wait_queue_head - puts skb to fcoe pending queue head
804 * @lp: the fc_port for this skb
805 * @skb: the associated skb to be xmitted
806 *
807 * Returns: none
808 **/
809static void fcoe_insert_wait_queue_head(struct fc_lport *lp,
810 struct sk_buff *skb)
811{
812 struct fcoe_softc *fc;
813
814 fc = fcoe_softc(lp);
815 spin_lock_bh(&fc->fcoe_pending_queue.lock);
816 __skb_queue_head(&fc->fcoe_pending_queue, skb);
817 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
818}
819
820/**
821 * fcoe_insert_wait_queue - put the skb into fcoe pending queue tail
822 * @lp: the fc_port for this skb
823 * @skb: the associated skb to be xmitted
824 *
825 * Returns: none
826 **/
827static void fcoe_insert_wait_queue(struct fc_lport *lp,
828 struct sk_buff *skb)
829{
830 struct fcoe_softc *fc;
831
832 fc = fcoe_softc(lp);
833 spin_lock_bh(&fc->fcoe_pending_queue.lock);
834 __skb_queue_tail(&fc->fcoe_pending_queue, skb);
835 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
836}
837
838/**
839 * fcoe_dev_setup - setup link change notification interface
840 *
841 **/
842static void fcoe_dev_setup(void)
843{
844 /*
845 * here setup a interface specific wd time to
846 * monitor the link state
847 */
848 register_netdevice_notifier(&fcoe_notifier);
849}
850
851/**
852 * fcoe_dev_setup - cleanup link change notification interface
853 **/
854static void fcoe_dev_cleanup(void)
855{
856 unregister_netdevice_notifier(&fcoe_notifier);
857}
858
859/**
860 * fcoe_device_notification - netdev event notification callback
861 * @notifier: context of the notification
862 * @event: type of event
863 * @ptr: fixed array for output parsed ifname
864 *
865 * This function is called by the ethernet driver in case of link change event
866 *
867 * Returns: 0 for success
868 **/
869static int fcoe_device_notification(struct notifier_block *notifier,
870 ulong event, void *ptr)
871{
872 struct fc_lport *lp = NULL;
873 struct net_device *real_dev = ptr;
874 struct fcoe_softc *fc;
875 struct fcoe_dev_stats *stats;
876 u16 new_status;
877 u32 mfs;
878 int rc = NOTIFY_OK;
879
880 read_lock(&fcoe_hostlist_lock);
881 list_for_each_entry(fc, &fcoe_hostlist, list) {
882 if (fc->real_dev == real_dev) {
883 lp = fc->lp;
884 break;
885 }
886 }
887 read_unlock(&fcoe_hostlist_lock);
888 if (lp == NULL) {
889 rc = NOTIFY_DONE;
890 goto out;
891 }
892
893 new_status = lp->link_status;
894 switch (event) {
895 case NETDEV_DOWN:
896 case NETDEV_GOING_DOWN:
897 new_status &= ~FC_LINK_UP;
898 break;
899 case NETDEV_UP:
900 case NETDEV_CHANGE:
901 new_status &= ~FC_LINK_UP;
902 if (!fcoe_link_ok(lp))
903 new_status |= FC_LINK_UP;
904 break;
905 case NETDEV_CHANGEMTU:
906 mfs = fc->real_dev->mtu -
907 (sizeof(struct fcoe_hdr) +
908 sizeof(struct fcoe_crc_eof));
909 if (mfs >= FC_MIN_MAX_FRAME)
910 fc_set_mfs(lp, mfs);
911 new_status &= ~FC_LINK_UP;
912 if (!fcoe_link_ok(lp))
913 new_status |= FC_LINK_UP;
914 break;
915 case NETDEV_REGISTER:
916 break;
917 default:
918 FC_DBG("unknown event %ld call", event);
919 }
920 if (lp->link_status != new_status) {
921 if ((new_status & FC_LINK_UP) == FC_LINK_UP)
922 fc_linkup(lp);
923 else {
924 stats = lp->dev_stats[smp_processor_id()];
925 if (stats)
926 stats->LinkFailureCount++;
927 fc_linkdown(lp);
928 fcoe_clean_pending_queue(lp);
929 }
930 }
931out:
932 return rc;
933}
934
935/**
936 * fcoe_if_to_netdev - parse a name buffer to get netdev
937 * @ifname: fixed array for output parsed ifname
938 * @buffer: incoming buffer to be copied
939 *
940 * Returns: NULL or ptr to netdeive
941 **/
942static struct net_device *fcoe_if_to_netdev(const char *buffer)
943{
944 char *cp;
945 char ifname[IFNAMSIZ + 2];
946
947 if (buffer) {
948 strlcpy(ifname, buffer, IFNAMSIZ);
949 cp = ifname + strlen(ifname);
950 while (--cp >= ifname && *cp == '\n')
951 *cp = '\0';
952 return dev_get_by_name(&init_net, ifname);
953 }
954 return NULL;
955}
956
957/**
958 * fcoe_netdev_to_module_owner - finds out the nic drive moddule of the netdev
959 * @netdev: the target netdev
960 *
961 * Returns: ptr to the struct module, NULL for failure
962 **/
963static struct module *fcoe_netdev_to_module_owner(
964 const struct net_device *netdev)
965{
966 struct device *dev;
967
968 if (!netdev)
969 return NULL;
970
971 dev = netdev->dev.parent;
972 if (!dev)
973 return NULL;
974
975 if (!dev->driver)
976 return NULL;
977
978 return dev->driver->owner;
979}
980
981/**
982 * fcoe_ethdrv_get - holds the nic driver module by try_module_get() for
983 * the corresponding netdev.
984 * @netdev: the target netdev
985 *
986 * Returns: 0 for succsss
987 **/
988static int fcoe_ethdrv_get(const struct net_device *netdev)
989{
990 struct module *owner;
991
992 owner = fcoe_netdev_to_module_owner(netdev);
993 if (owner) {
994 printk(KERN_DEBUG "foce:hold driver module %s for %s\n",
995 owner->name, netdev->name);
996 return try_module_get(owner);
997 }
998 return -ENODEV;
999}
1000
1001/**
1002 * fcoe_ethdrv_get - releases the nic driver module by module_put for
1003 * the corresponding netdev.
1004 * @netdev: the target netdev
1005 *
1006 * Returns: 0 for succsss
1007 **/
1008static int fcoe_ethdrv_put(const struct net_device *netdev)
1009{
1010 struct module *owner;
1011
1012 owner = fcoe_netdev_to_module_owner(netdev);
1013 if (owner) {
1014 printk(KERN_DEBUG "foce:release driver module %s for %s\n",
1015 owner->name, netdev->name);
1016 module_put(owner);
1017 return 0;
1018 }
1019 return -ENODEV;
1020}
1021
1022/**
1023 * fcoe_destroy- handles the destroy from sysfs
1024 * @buffer: expcted to be a eth if name
1025 * @kp: associated kernel param
1026 *
1027 * Returns: 0 for success
1028 **/
1029static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
1030{
1031 int rc;
1032 struct net_device *netdev;
1033
1034 netdev = fcoe_if_to_netdev(buffer);
1035 if (!netdev) {
1036 rc = -ENODEV;
1037 goto out_nodev;
1038 }
1039 /* look for existing lport */
1040 if (!fcoe_hostlist_lookup(netdev)) {
1041 rc = -ENODEV;
1042 goto out_putdev;
1043 }
1044 /* pass to transport */
1045 rc = fcoe_transport_release(netdev);
1046 if (rc) {
1047 printk(KERN_ERR "fcoe: fcoe_transport_release(%s) failed\n",
1048 netdev->name);
1049 rc = -EIO;
1050 goto out_putdev;
1051 }
1052 fcoe_ethdrv_put(netdev);
1053 rc = 0;
1054out_putdev:
1055 dev_put(netdev);
1056out_nodev:
1057 return rc;
1058}
1059
1060/**
1061 * fcoe_create - handles the create call from sysfs
1062 * @buffer: expcted to be a eth if name
1063 * @kp: associated kernel param
1064 *
1065 * Returns: 0 for success
1066 **/
1067static int fcoe_create(const char *buffer, struct kernel_param *kp)
1068{
1069 int rc;
1070 struct net_device *netdev;
1071
1072 netdev = fcoe_if_to_netdev(buffer);
1073 if (!netdev) {
1074 rc = -ENODEV;
1075 goto out_nodev;
1076 }
1077 /* look for existing lport */
1078 if (fcoe_hostlist_lookup(netdev)) {
1079 rc = -EEXIST;
1080 goto out_putdev;
1081 }
1082 fcoe_ethdrv_get(netdev);
1083
1084 /* pass to transport */
1085 rc = fcoe_transport_attach(netdev);
1086 if (rc) {
1087 printk(KERN_ERR "fcoe: fcoe_transport_attach(%s) failed\n",
1088 netdev->name);
1089 fcoe_ethdrv_put(netdev);
1090 rc = -EIO;
1091 goto out_putdev;
1092 }
1093 rc = 0;
1094out_putdev:
1095 dev_put(netdev);
1096out_nodev:
1097 return rc;
1098}
1099
1100module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
1101__MODULE_PARM_TYPE(create, "string");
1102MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
1103module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
1104__MODULE_PARM_TYPE(destroy, "string");
1105MODULE_PARM_DESC(destroy, "Destroy fcoe port");
1106
1107/*
1108 * fcoe_link_ok - check if link is ok for the fc_lport
1109 * @lp: ptr to the fc_lport
1110 *
1111 * Any permanently-disqualifying conditions have been previously checked.
1112 * This also updates the speed setting, which may change with link for 100/1000.
1113 *
1114 * This function should probably be checking for PAUSE support at some point
1115 * in the future. Currently Per-priority-pause is not determinable using
1116 * ethtool, so we shouldn't be restrictive until that problem is resolved.
1117 *
1118 * Returns: 0 if link is OK for use by FCoE.
1119 *
1120 */
1121int fcoe_link_ok(struct fc_lport *lp)
1122{
1123 struct fcoe_softc *fc = fcoe_softc(lp);
1124 struct net_device *dev = fc->real_dev;
1125 struct ethtool_cmd ecmd = { ETHTOOL_GSET };
1126 int rc = 0;
1127
1128 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
1129 dev = fc->phys_dev;
1130 if (dev->ethtool_ops->get_settings) {
1131 dev->ethtool_ops->get_settings(dev, &ecmd);
1132 lp->link_supported_speeds &=
1133 ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
1134 if (ecmd.supported & (SUPPORTED_1000baseT_Half |
1135 SUPPORTED_1000baseT_Full))
1136 lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
1137 if (ecmd.supported & SUPPORTED_10000baseT_Full)
1138 lp->link_supported_speeds |=
1139 FC_PORTSPEED_10GBIT;
1140 if (ecmd.speed == SPEED_1000)
1141 lp->link_speed = FC_PORTSPEED_1GBIT;
1142 if (ecmd.speed == SPEED_10000)
1143 lp->link_speed = FC_PORTSPEED_10GBIT;
1144 }
1145 } else
1146 rc = -1;
1147
1148 return rc;
1149}
1150EXPORT_SYMBOL_GPL(fcoe_link_ok);
1151
1152/*
1153 * fcoe_percpu_clean - frees skb of the corresponding lport from the per
1154 * cpu queue.
1155 * @lp: the fc_lport
1156 */
1157void fcoe_percpu_clean(struct fc_lport *lp)
1158{
1159 int idx;
1160 struct fcoe_percpu_s *pp;
1161 struct fcoe_rcv_info *fr;
1162 struct sk_buff_head *list;
1163 struct sk_buff *skb, *next;
1164 struct sk_buff *head;
1165
1166 for (idx = 0; idx < NR_CPUS; idx++) {
1167 if (fcoe_percpu[idx]) {
1168 pp = fcoe_percpu[idx];
1169 spin_lock_bh(&pp->fcoe_rx_list.lock);
1170 list = &pp->fcoe_rx_list;
1171 head = list->next;
1172 for (skb = head; skb != (struct sk_buff *)list;
1173 skb = next) {
1174 next = skb->next;
1175 fr = fcoe_dev_from_skb(skb);
1176 if (fr->fr_dev == lp) {
1177 __skb_unlink(skb, list);
1178 kfree_skb(skb);
1179 }
1180 }
1181 spin_unlock_bh(&pp->fcoe_rx_list.lock);
1182 }
1183 }
1184}
1185EXPORT_SYMBOL_GPL(fcoe_percpu_clean);
1186
1187/**
1188 * fcoe_clean_pending_queue - dequeue skb and free it
1189 * @lp: the corresponding fc_lport
1190 *
1191 * Returns: none
1192 **/
1193void fcoe_clean_pending_queue(struct fc_lport *lp)
1194{
1195 struct fcoe_softc *fc = lport_priv(lp);
1196 struct sk_buff *skb;
1197
1198 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1199 while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
1200 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1201 kfree_skb(skb);
1202 spin_lock_bh(&fc->fcoe_pending_queue.lock);
1203 }
1204 spin_unlock_bh(&fc->fcoe_pending_queue.lock);
1205}
1206EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
1207
1208/**
1209 * libfc_host_alloc - allocate a Scsi_Host with room for the fc_lport
1210 * @sht: ptr to the scsi host templ
1211 * @priv_size: size of private data after fc_lport
1212 *
1213 * Returns: ptr to Scsi_Host
1214 * TODO - to libfc?
1215 */
1216static inline struct Scsi_Host *libfc_host_alloc(
1217 struct scsi_host_template *sht, int priv_size)
1218{
1219 return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
1220}
1221
1222/**
1223 * fcoe_host_alloc - allocate a Scsi_Host with room for the fcoe_softc
1224 * @sht: ptr to the scsi host templ
1225 * @priv_size: size of private data after fc_lport
1226 *
1227 * Returns: ptr to Scsi_Host
1228 */
1229struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
1230{
1231 return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
1232}
1233EXPORT_SYMBOL_GPL(fcoe_host_alloc);
1234
1235/*
1236 * fcoe_reset - resets the fcoe
1237 * @shost: shost the reset is from
1238 *
1239 * Returns: always 0
1240 */
1241int fcoe_reset(struct Scsi_Host *shost)
1242{
1243 struct fc_lport *lport = shost_priv(shost);
1244 fc_lport_reset(lport);
1245 return 0;
1246}
1247EXPORT_SYMBOL_GPL(fcoe_reset);
1248
1249/*
1250 * fcoe_wwn_from_mac - converts 48-bit IEEE MAC address to 64-bit FC WWN.
1251 * @mac: mac address
1252 * @scheme: check port
1253 * @port: port indicator for converting
1254 *
1255 * Returns: u64 fc world wide name
1256 */
1257u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1258 unsigned int scheme, unsigned int port)
1259{
1260 u64 wwn;
1261 u64 host_mac;
1262
1263 /* The MAC is in NO, so flip only the low 48 bits */
1264 host_mac = ((u64) mac[0] << 40) |
1265 ((u64) mac[1] << 32) |
1266 ((u64) mac[2] << 24) |
1267 ((u64) mac[3] << 16) |
1268 ((u64) mac[4] << 8) |
1269 (u64) mac[5];
1270
1271 WARN_ON(host_mac >= (1ULL << 48));
1272 wwn = host_mac | ((u64) scheme << 60);
1273 switch (scheme) {
1274 case 1:
1275 WARN_ON(port != 0);
1276 break;
1277 case 2:
1278 WARN_ON(port >= 0xfff);
1279 wwn |= (u64) port << 48;
1280 break;
1281 default:
1282 WARN_ON(1);
1283 break;
1284 }
1285
1286 return wwn;
1287}
1288EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1289/*
1290 * fcoe_hostlist_lookup_softc - find the corresponding lport by a given device
1291 * @device: this is currently ptr to net_device
1292 *
1293 * Returns: NULL or the located fcoe_softc
1294 */
1295static struct fcoe_softc *fcoe_hostlist_lookup_softc(
1296 const struct net_device *dev)
1297{
1298 struct fcoe_softc *fc;
1299
1300 read_lock(&fcoe_hostlist_lock);
1301 list_for_each_entry(fc, &fcoe_hostlist, list) {
1302 if (fc->real_dev == dev) {
1303 read_unlock(&fcoe_hostlist_lock);
1304 return fc;
1305 }
1306 }
1307 read_unlock(&fcoe_hostlist_lock);
1308 return NULL;
1309}
1310
1311/*
1312 * fcoe_hostlist_lookup - find the corresponding lport by netdev
1313 * @netdev: ptr to net_device
1314 *
1315 * Returns: 0 for success
1316 */
1317struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
1318{
1319 struct fcoe_softc *fc;
1320
1321 fc = fcoe_hostlist_lookup_softc(netdev);
1322
1323 return (fc) ? fc->lp : NULL;
1324}
1325EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);
1326
1327/*
1328 * fcoe_hostlist_add - add a lport to lports list
1329 * @lp: ptr to the fc_lport to badded
1330 *
1331 * Returns: 0 for success
1332 */
1333int fcoe_hostlist_add(const struct fc_lport *lp)
1334{
1335 struct fcoe_softc *fc;
1336
1337 fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
1338 if (!fc) {
1339 fc = fcoe_softc(lp);
1340 write_lock_bh(&fcoe_hostlist_lock);
1341 list_add_tail(&fc->list, &fcoe_hostlist);
1342 write_unlock_bh(&fcoe_hostlist_lock);
1343 }
1344 return 0;
1345}
1346EXPORT_SYMBOL_GPL(fcoe_hostlist_add);
1347
1348/*
1349 * fcoe_hostlist_remove - remove a lport from lports list
1350 * @lp: ptr to the fc_lport to badded
1351 *
1352 * Returns: 0 for success
1353 */
1354int fcoe_hostlist_remove(const struct fc_lport *lp)
1355{
1356 struct fcoe_softc *fc;
1357
1358 fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
1359 BUG_ON(!fc);
1360 write_lock_bh(&fcoe_hostlist_lock);
1361 list_del(&fc->list);
1362 write_unlock_bh(&fcoe_hostlist_lock);
1363
1364 return 0;
1365}
1366EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);
1367
1368/**
1369 * fcoe_libfc_config - sets up libfc related properties for lport
1370 * @lp: ptr to the fc_lport
1371 * @tt: libfc function template
1372 *
1373 * Returns : 0 for success
1374 **/
1375int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
1376{
1377 /* Set the function pointers set by the LLDD */
1378 memcpy(&lp->tt, tt, sizeof(*tt));
1379 if (fc_fcp_init(lp))
1380 return -ENOMEM;
1381 fc_exch_init(lp);
1382 fc_elsct_init(lp);
1383 fc_lport_init(lp);
1384 fc_rport_init(lp);
1385 fc_disc_init(lp);
1386
1387 return 0;
1388}
1389EXPORT_SYMBOL_GPL(fcoe_libfc_config);
1390
1391/**
1392 * fcoe_init - fcoe module loading initialization
1393 *
1394 * Initialization routine
1395 * 1. Will create fc transport software structure
1396 * 2. initialize the link list of port information structure
1397 *
1398 * Returns 0 on success, negative on failure
1399 **/
1400static int __init fcoe_init(void)
1401{
1402 int cpu;
1403 struct fcoe_percpu_s *p;
1404
1405
1406 INIT_LIST_HEAD(&fcoe_hostlist);
1407 rwlock_init(&fcoe_hostlist_lock);
1408
1409#ifdef CONFIG_HOTPLUG_CPU
1410 register_cpu_notifier(&fcoe_cpu_notifier);
1411#endif /* CONFIG_HOTPLUG_CPU */
1412
1413 /*
1414 * initialize per CPU interrupt thread
1415 */
1416 for_each_online_cpu(cpu) {
1417 p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL);
1418 if (p) {
1419 p->thread = kthread_create(fcoe_percpu_receive_thread,
1420 (void *)p,
1421 "fcoethread/%d", cpu);
1422
1423 /*
1424 * if there is no error then bind the thread to the cpu
1425 * initialize the semaphore and skb queue head
1426 */
1427 if (likely(!IS_ERR(p->thread))) {
1428 p->cpu = cpu;
1429 fcoe_percpu[cpu] = p;
1430 skb_queue_head_init(&p->fcoe_rx_list);
1431 kthread_bind(p->thread, cpu);
1432 wake_up_process(p->thread);
1433 } else {
1434 fcoe_percpu[cpu] = NULL;
1435 kfree(p);
1436
1437 }
1438 }
1439 }
1440
1441 /*
1442 * setup link change notification
1443 */
1444 fcoe_dev_setup();
1445
1446 init_timer(&fcoe_timer);
1447 fcoe_timer.data = 0;
1448 fcoe_timer.function = fcoe_watchdog;
1449 fcoe_timer.expires = (jiffies + (10 * HZ));
1450 add_timer(&fcoe_timer);
1451
1452 /* initiatlize the fcoe transport */
1453 fcoe_transport_init();
1454
1455 fcoe_sw_init();
1456
1457 return 0;
1458}
1459module_init(fcoe_init);
1460
1461/**
1462 * fcoe_exit - fcoe module unloading cleanup
1463 *
1464 * Returns 0 on success, negative on failure
1465 **/
1466static void __exit fcoe_exit(void)
1467{
1468 u32 idx;
1469 struct fcoe_softc *fc, *tmp;
1470 struct fcoe_percpu_s *p;
1471 struct sk_buff *skb;
1472
1473 /*
1474 * Stop all call back interfaces
1475 */
1476#ifdef CONFIG_HOTPLUG_CPU
1477 unregister_cpu_notifier(&fcoe_cpu_notifier);
1478#endif /* CONFIG_HOTPLUG_CPU */
1479 fcoe_dev_cleanup();
1480
1481 /*
1482 * stop timer
1483 */
1484 del_timer_sync(&fcoe_timer);
1485
1486 /* releases the assocaited fcoe transport for each lport */
1487 list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
1488 fcoe_transport_release(fc->real_dev);
1489
1490 for (idx = 0; idx < NR_CPUS; idx++) {
1491 if (fcoe_percpu[idx]) {
1492 kthread_stop(fcoe_percpu[idx]->thread);
1493 p = fcoe_percpu[idx];
1494 spin_lock_bh(&p->fcoe_rx_list.lock);
1495 while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
1496 kfree_skb(skb);
1497 spin_unlock_bh(&p->fcoe_rx_list.lock);
1498 if (fcoe_percpu[idx]->crc_eof_page)
1499 put_page(fcoe_percpu[idx]->crc_eof_page);
1500 kfree(fcoe_percpu[idx]);
1501 }
1502 }
1503
1504 /* remove sw trasnport */
1505 fcoe_sw_exit();
1506
1507 /* detach the transport */
1508 fcoe_transport_exit();
1509}
1510module_exit(fcoe_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-05 01:49:45 -0500