2 * Copyright(c) 2007 - 2008 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/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>
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>
42 #include <scsi/fc/fc_encaps.h>
44 #include <scsi/libfc.h>
45 #include <scsi/fc_frame.h>
46 #include <scsi/libfcoe.h>
47 #include <scsi/fc_transport_fcoe.h>
49 static int debug_fcoe
;
51 #define FCOE_MAX_QUEUE_DEPTH 256
53 /* destination address mode */
54 #define FCOE_GW_ADDR_MODE 0x00
55 #define FCOE_FCOUI_ADDR_MODE 0x01
57 #define FCOE_WORD_TO_BYTE 4
59 MODULE_AUTHOR("Open-FCoE.org");
60 MODULE_DESCRIPTION("FCoE");
61 MODULE_LICENSE("GPL");
64 LIST_HEAD(fcoe_hostlist
);
65 DEFINE_RWLOCK(fcoe_hostlist_lock
);
66 DEFINE_TIMER(fcoe_timer
, NULL
, 0, 0);
67 struct fcoe_percpu_s
*fcoe_percpu
[NR_CPUS
];
70 /* Function Prototyes */
71 static int fcoe_check_wait_queue(struct fc_lport
*);
72 static void fcoe_insert_wait_queue_head(struct fc_lport
*, struct sk_buff
*);
73 static void fcoe_insert_wait_queue(struct fc_lport
*, struct sk_buff
*);
74 static void fcoe_recv_flogi(struct fcoe_softc
*, struct fc_frame
*, u8
*);
75 #ifdef CONFIG_HOTPLUG_CPU
76 static int fcoe_cpu_callback(struct notifier_block
*, ulong
, void *);
77 #endif /* CONFIG_HOTPLUG_CPU */
78 static int fcoe_device_notification(struct notifier_block
*, ulong
, void *);
79 static void fcoe_dev_setup(void);
80 static void fcoe_dev_cleanup(void);
82 /* notification function from net device */
83 static struct notifier_block fcoe_notifier
= {
84 .notifier_call
= fcoe_device_notification
,
88 #ifdef CONFIG_HOTPLUG_CPU
89 static struct notifier_block fcoe_cpu_notifier
= {
90 .notifier_call
= fcoe_cpu_callback
,
94 * fcoe_create_percpu_data - creates the associated cpu data
95 * @cpu: index for the cpu where fcoe cpu data will be created
97 * create percpu stats block, from cpu add notifier
101 static void fcoe_create_percpu_data(int cpu
)
104 struct fcoe_softc
*fc
;
106 write_lock_bh(&fcoe_hostlist_lock
);
107 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
109 if (lp
->dev_stats
[cpu
] == NULL
)
111 kzalloc(sizeof(struct fcoe_dev_stats
),
114 write_unlock_bh(&fcoe_hostlist_lock
);
118 * fcoe_destroy_percpu_data - destroys the associated cpu data
119 * @cpu: index for the cpu where fcoe cpu data will destroyed
121 * destroy percpu stats block called by cpu add/remove notifier
125 static void fcoe_destroy_percpu_data(int cpu
)
128 struct fcoe_softc
*fc
;
130 write_lock_bh(&fcoe_hostlist_lock
);
131 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
133 kfree(lp
->dev_stats
[cpu
]);
134 lp
->dev_stats
[cpu
] = NULL
;
136 write_unlock_bh(&fcoe_hostlist_lock
);
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
145 * this creates or destroys per cpu data for fcoe
147 * Returns NOTIFY_OK always.
149 static int fcoe_cpu_callback(struct notifier_block
*nfb
, unsigned long action
,
152 unsigned int cpu
= (unsigned long)hcpu
;
156 fcoe_create_percpu_data(cpu
);
159 fcoe_destroy_percpu_data(cpu
);
166 #endif /* CONFIG_HOTPLUG_CPU */
169 * foce_rcv - this is the fcoe receive function called by NET_RX_SOFTIRQ
170 * @skb: the receive skb
171 * @dev: associated net device
173 * @odldev: last device
175 * this function will receive the packet and build fc frame and pass it up
177 * Returns: 0 for success
179 int fcoe_rcv(struct sk_buff
*skb
, struct net_device
*dev
,
180 struct packet_type
*ptype
, struct net_device
*olddev
)
183 struct fcoe_rcv_info
*fr
;
184 struct fcoe_softc
*fc
;
185 struct fcoe_dev_stats
*stats
;
186 struct fc_frame_header
*fh
;
189 struct fcoe_percpu_s
*fps
;
191 fc
= container_of(ptype
, struct fcoe_softc
, fcoe_packet_type
);
193 if (unlikely(lp
== NULL
)) {
194 FC_DBG("cannot find hba structure");
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>");
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");
214 * Check for minimum frame length, and make sure required FCoE
215 * and FC headers are pulled into the linear data area.
217 if (unlikely((skb
->len
< FCOE_MIN_FRAME
) ||
218 !pskb_may_pull(skb
, FCOE_HEADER_LEN
)))
221 skb_set_transport_header(skb
, sizeof(struct fcoe_hdr
));
222 fh
= (struct fc_frame_header
*) skb_transport_header(skb
);
224 oxid
= ntohs(fh
->fh_ox_id
);
226 fr
= fcoe_dev_from_skb(skb
);
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.
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
);
242 fps
= fcoe_percpu
[cpu_idx
];
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
);
249 spin_unlock_bh(&fps
->fcoe_rx_list
.lock
);
254 stats
= lp
->dev_stats
[smp_processor_id()];
256 stats
= lp
->dev_stats
[0];
259 stats
->ErrorFrames
++;
265 EXPORT_SYMBOL_GPL(fcoe_rcv
);
268 * fcoe_start_io - pass to netdev to start xmit for fcoe
269 * @skb: the skb to be xmitted
271 * Returns: 0 for success
273 static inline int fcoe_start_io(struct sk_buff
*skb
)
278 rc
= dev_queue_xmit(skb
);
286 * fcoe_get_paged_crc_eof - in case we need alloc a page for crc_eof
287 * @skb: the skb to be xmitted
290 * Returns: 0 for success
292 static int fcoe_get_paged_crc_eof(struct sk_buff
*skb
, int tlen
)
294 struct fcoe_percpu_s
*fps
;
299 fps
= fcoe_percpu
[cpu_idx
];
300 page
= fps
->crc_eof_page
;
302 page
= alloc_page(GFP_ATOMIC
);
307 fps
->crc_eof_page
= page
;
308 WARN_ON(fps
->crc_eof_offset
!= 0);
312 skb_fill_page_desc(skb
, skb_shinfo(skb
)->nr_frags
, page
,
313 fps
->crc_eof_offset
, tlen
);
315 skb
->data_len
+= tlen
;
316 skb
->truesize
+= tlen
;
317 fps
->crc_eof_offset
+= sizeof(struct fcoe_crc_eof
);
319 if (fps
->crc_eof_offset
>= PAGE_SIZE
) {
320 fps
->crc_eof_page
= NULL
;
321 fps
->crc_eof_offset
= 0;
329 * fcoe_fc_crc - calculates FC CRC in this fcoe skb
330 * @fp: the fc_frame containg data to be checksummed
332 * This uses crc32() to calculate the crc for fc frame
333 * Return : 32 bit crc
336 u32
fcoe_fc_crc(struct fc_frame
*fp
)
338 struct sk_buff
*skb
= fp_skb(fp
);
339 struct skb_frag_struct
*frag
;
341 unsigned long off
, len
, clen
;
345 crc
= crc32(~0, skb
->data
, skb_headlen(skb
));
347 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
348 frag
= &skb_shinfo(skb
)->frags
[i
];
349 off
= frag
->page_offset
;
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
);
363 EXPORT_SYMBOL_GPL(fcoe_fc_crc
);
366 * fcoe_xmit - FCoE frame transmit function
367 * @lp: the associated local port
368 * @fp: the fc_frame to be transmitted
370 * Return : 0 for success
373 int fcoe_xmit(struct fc_lport
*lp
, struct fc_frame
*fp
)
378 struct fcoe_crc_eof
*cp
;
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
;
390 WARN_ON((fr_len(fp
) % sizeof(u32
)) != 0);
394 * if it is a flogi then we need to learn gw-addr
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) {
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
412 fc_fcoe_set_mac(fc
->data_src_addr
, fh
->fh_s_id
);
413 fc
->flogi_progress
= 0;
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
;
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
;
434 skb
->ip_summed
= CHECKSUM_NONE
;
435 crc
= fcoe_fc_crc(fp
);
438 /* copy fc crc and eof to the skb buff */
439 if (skb_is_nonlinear(skb
)) {
441 if (fcoe_get_paged_crc_eof(skb
, tlen
)) {
445 frag
= &skb_shinfo(skb
)->frags
[skb_shinfo(skb
)->nr_frags
- 1];
446 cp
= kmap_atomic(frag
->page
, KM_SKB_DATA_SOFTIRQ
)
449 cp
= (struct fcoe_crc_eof
*)skb_put(skb
, tlen
);
452 memset(cp
, 0, sizeof(*cp
));
454 cp
->fcoe_crc32
= cpu_to_le32(~crc
);
456 if (skb_is_nonlinear(skb
)) {
457 kunmap_atomic(cp
, KM_SKB_DATA_SOFTIRQ
);
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
);
466 skb
->protocol
= htons(ETH_P_802_3
);
467 skb
->dev
= fc
->real_dev
;
469 /* fill up mac and fcoe headers */
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
);
475 /* insert GW address */
476 memcpy(eh
->h_dest
, fc
->dest_addr
, ETH_ALEN
);
478 if (unlikely(flogi_in_progress
))
479 memcpy(eh
->h_source
, fc
->ctl_src_addr
, ETH_ALEN
);
481 memcpy(eh
->h_source
, fc
->data_src_addr
, ETH_ALEN
);
483 hp
= (struct fcoe_hdr
*)(eh
+ 1);
484 memset(hp
, 0, sizeof(*hp
));
486 FC_FCOE_ENCAPS_VER(hp
, FC_FCOE_VER
);
489 /* update tx stats: regardless if LLD fails */
490 stats
= lp
->dev_stats
[smp_processor_id()];
493 stats
->TxWords
+= wlen
;
496 /* send down to lld */
498 if (fc
->fcoe_pending_queue
.qlen
)
499 rc
= fcoe_check_wait_queue(lp
);
502 rc
= fcoe_start_io(skb
);
505 fcoe_insert_wait_queue(lp
, skb
);
506 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
512 EXPORT_SYMBOL_GPL(fcoe_xmit
);
515 * fcoe_percpu_receive_thread - recv thread per cpu
516 * @arg: ptr to the fcoe per cpu struct
518 * Return: 0 for success
521 int fcoe_percpu_receive_thread(void *arg
)
523 struct fcoe_percpu_s
*p
= arg
;
526 struct fcoe_rcv_info
*fr
;
527 struct fcoe_dev_stats
*stats
;
528 struct fc_frame_header
*fh
;
530 struct fcoe_crc_eof crc_eof
;
533 struct fcoe_softc
*fc
;
536 set_user_nice(current
, 19);
538 while (!kthread_should_stop()) {
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
);
545 set_current_state(TASK_RUNNING
);
546 if (kthread_should_stop())
548 spin_lock_bh(&p
->fcoe_rx_list
.lock
);
550 spin_unlock_bh(&p
->fcoe_rx_list
.lock
);
551 fr
= fcoe_dev_from_skb(skb
);
553 if (unlikely(lp
== NULL
)) {
554 FC_DBG("invalid HBA Structure");
559 stats
= lp
->dev_stats
[smp_processor_id()];
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>");
571 * Save source MAC address before discarding header.
574 if (unlikely(fc
->flogi_progress
))
575 mac
= eth_hdr(skb
)->h_source
;
577 if (skb_is_nonlinear(skb
))
578 skb_linearize(skb
); /* not ideal */
581 * Frame length checks and setting up the header pointers
582 * was done in fcoe_rcv already.
584 hp
= (struct fcoe_hdr
*) skb_network_header(skb
);
585 fh
= (struct fc_frame_header
*) skb_transport_header(skb
);
587 if (unlikely(FC_FCOE_DECAPS_VER(hp
) != FC_FCOE_VER
)) {
589 if (stats
->ErrorFrames
< 5)
590 FC_DBG("unknown FCoE version %x",
591 FC_FCOE_DECAPS_VER(hp
));
592 stats
->ErrorFrames
++;
598 skb_pull(skb
, sizeof(struct fcoe_hdr
));
599 fr_len
= skb
->len
- sizeof(struct fcoe_crc_eof
);
603 stats
->RxWords
+= fr_len
/ FCOE_WORD_TO_BYTE
;
606 fp
= (struct fc_frame
*)skb
;
609 fr_sof(fp
) = hp
->fcoe_sof
;
611 /* Copy out the CRC and EOF trailer for access */
612 if (skb_copy_bits(skb
, fr_len
, &crc_eof
, sizeof(crc_eof
))) {
616 fr_eof(fp
) = crc_eof
.fcoe_eof
;
617 fr_crc(fp
) = crc_eof
.fcoe_crc32
;
618 if (pskb_trim(skb
, fr_len
)) {
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.
629 fr_flags(fp
) &= ~FCPHF_CRC_UNCHECKED
;
631 fr_flags(fp
) |= FCPHF_CRC_UNCHECKED
;
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
);
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
++;
650 fr_flags(fp
) &= ~FCPHF_CRC_UNCHECKED
;
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
);
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
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.
671 static void fcoe_recv_flogi(struct fcoe_softc
*fc
, struct fc_frame
*fp
, u8
*sa
)
673 struct fc_frame_header
*fh
;
676 fh
= fc_frame_header_get(fp
);
677 if (fh
->fh_type
!= FC_TYPE_ELS
)
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
)) {
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
688 if (!compare_ether_addr(sa
, (u8
[6]) FC_FCOE_FLOGI_MAC
)) {
689 fc
->address_mode
= FCOE_FCOUI_ADDR_MODE
;
691 memcpy(fc
->dest_addr
, sa
, ETH_ALEN
);
692 fc
->address_mode
= FCOE_GW_ADDR_MODE
;
696 * Remove any previously-set unicast MAC filter.
697 * Add secondary FCoE MAC address filter for our OUI.
700 if (compare_ether_addr(fc
->data_src_addr
, (u8
[6]) { 0 }))
701 dev_unicast_delete(fc
->real_dev
, fc
->data_src_addr
,
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
);
707 fc
->flogi_progress
= 0;
708 } else if (op
== ELS_FLOGI
&& fh
->fh_r_ctl
== FC_RCTL_ELS_REQ
&& sa
) {
710 * Save source MAC for point-to-point responses.
712 memcpy(fc
->dest_addr
, sa
, ETH_ALEN
);
713 fc
->address_mode
= FCOE_GW_ADDR_MODE
;
718 * fcoe_watchdog - fcoe timer callback
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
725 * Returns: 0 for success
727 void fcoe_watchdog(ulong vp
)
730 struct fcoe_softc
*fc
;
733 read_lock(&fcoe_hostlist_lock
);
734 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
737 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
739 if (fcoe_check_wait_queue(lp
) < FCOE_MAX_QUEUE_DEPTH
) {
745 read_unlock(&fcoe_hostlist_lock
);
747 fcoe_timer
.expires
= jiffies
+ (1 * HZ
);
748 add_timer(&fcoe_timer
);
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
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
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.
766 * Returns: 0 for success
768 static int fcoe_check_wait_queue(struct fc_lport
*lp
)
773 struct fcoe_softc
*fc
;
776 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
779 * is this interface paused?
781 if (fc
->fcoe_pending_queue
.qlen
> FCOE_MAX_QUEUE_DEPTH
)
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
);
788 fcoe_insert_wait_queue_head(lp
, skb
);
791 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
793 if (fc
->fcoe_pending_queue
.qlen
< FCOE_MAX_QUEUE_DEPTH
)
796 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
797 if ((unpause
) && (paused
))
799 return fc
->fcoe_pending_queue
.qlen
;
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
809 static void fcoe_insert_wait_queue_head(struct fc_lport
*lp
,
812 struct fcoe_softc
*fc
;
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
);
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
827 static void fcoe_insert_wait_queue(struct fc_lport
*lp
,
830 struct fcoe_softc
*fc
;
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
);
839 * fcoe_dev_setup - setup link change notification interface
842 static void fcoe_dev_setup(void)
845 * here setup a interface specific wd time to
846 * monitor the link state
848 register_netdevice_notifier(&fcoe_notifier
);
852 * fcoe_dev_setup - cleanup link change notification interface
854 static void fcoe_dev_cleanup(void)
856 unregister_netdevice_notifier(&fcoe_notifier
);
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
865 * This function is called by the ethernet driver in case of link change event
867 * Returns: 0 for success
869 static int fcoe_device_notification(struct notifier_block
*notifier
,
870 ulong event
, void *ptr
)
872 struct fc_lport
*lp
= NULL
;
873 struct net_device
*real_dev
= ptr
;
874 struct fcoe_softc
*fc
;
875 struct fcoe_dev_stats
*stats
;
880 read_lock(&fcoe_hostlist_lock
);
881 list_for_each_entry(fc
, &fcoe_hostlist
, list
) {
882 if (fc
->real_dev
== real_dev
) {
887 read_unlock(&fcoe_hostlist_lock
);
893 new_status
= lp
->link_status
;
896 case NETDEV_GOING_DOWN
:
897 new_status
&= ~FC_LINK_UP
;
901 new_status
&= ~FC_LINK_UP
;
902 if (!fcoe_link_ok(lp
))
903 new_status
|= FC_LINK_UP
;
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
)
911 new_status
&= ~FC_LINK_UP
;
912 if (!fcoe_link_ok(lp
))
913 new_status
|= FC_LINK_UP
;
915 case NETDEV_REGISTER
:
918 FC_DBG("unknown event %ld call", event
);
920 if (lp
->link_status
!= new_status
) {
921 if ((new_status
& FC_LINK_UP
) == FC_LINK_UP
)
924 stats
= lp
->dev_stats
[smp_processor_id()];
926 stats
->LinkFailureCount
++;
928 fcoe_clean_pending_queue(lp
);
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
940 * Returns: NULL or ptr to netdeive
942 static struct net_device
*fcoe_if_to_netdev(const char *buffer
)
945 char ifname
[IFNAMSIZ
+ 2];
948 strlcpy(ifname
, buffer
, IFNAMSIZ
);
949 cp
= ifname
+ strlen(ifname
);
950 while (--cp
>= ifname
&& *cp
== '\n')
952 return dev_get_by_name(&init_net
, ifname
);
958 * fcoe_netdev_to_module_owner - finds out the nic drive moddule of the netdev
959 * @netdev: the target netdev
961 * Returns: ptr to the struct module, NULL for failure
963 static struct module
*fcoe_netdev_to_module_owner(
964 const struct net_device
*netdev
)
971 dev
= netdev
->dev
.parent
;
978 return dev
->driver
->owner
;
982 * fcoe_ethdrv_get - holds the nic driver module by try_module_get() for
983 * the corresponding netdev.
984 * @netdev: the target netdev
986 * Returns: 0 for succsss
988 static int fcoe_ethdrv_get(const struct net_device
*netdev
)
990 struct module
*owner
;
992 owner
= fcoe_netdev_to_module_owner(netdev
);
994 printk(KERN_DEBUG
"foce:hold driver module %s for %s\n",
995 owner
->name
, netdev
->name
);
996 return try_module_get(owner
);
1002 * fcoe_ethdrv_get - releases the nic driver module by module_put for
1003 * the corresponding netdev.
1004 * @netdev: the target netdev
1006 * Returns: 0 for succsss
1008 static int fcoe_ethdrv_put(const struct net_device
*netdev
)
1010 struct module
*owner
;
1012 owner
= fcoe_netdev_to_module_owner(netdev
);
1014 printk(KERN_DEBUG
"foce:release driver module %s for %s\n",
1015 owner
->name
, netdev
->name
);
1023 * fcoe_destroy- handles the destroy from sysfs
1024 * @buffer: expcted to be a eth if name
1025 * @kp: associated kernel param
1027 * Returns: 0 for success
1029 static int fcoe_destroy(const char *buffer
, struct kernel_param
*kp
)
1032 struct net_device
*netdev
;
1034 netdev
= fcoe_if_to_netdev(buffer
);
1039 /* look for existing lport */
1040 if (!fcoe_hostlist_lookup(netdev
)) {
1044 /* pass to transport */
1045 rc
= fcoe_transport_release(netdev
);
1047 printk(KERN_ERR
"fcoe: fcoe_transport_release(%s) failed\n",
1052 fcoe_ethdrv_put(netdev
);
1061 * fcoe_create - handles the create call from sysfs
1062 * @buffer: expcted to be a eth if name
1063 * @kp: associated kernel param
1065 * Returns: 0 for success
1067 static int fcoe_create(const char *buffer
, struct kernel_param
*kp
)
1070 struct net_device
*netdev
;
1072 netdev
= fcoe_if_to_netdev(buffer
);
1077 /* look for existing lport */
1078 if (fcoe_hostlist_lookup(netdev
)) {
1082 fcoe_ethdrv_get(netdev
);
1084 /* pass to transport */
1085 rc
= fcoe_transport_attach(netdev
);
1087 printk(KERN_ERR
"fcoe: fcoe_transport_attach(%s) failed\n",
1089 fcoe_ethdrv_put(netdev
);
1100 module_param_call(create
, fcoe_create
, NULL
, NULL
, S_IWUSR
);
1101 __MODULE_PARM_TYPE(create
, "string");
1102 MODULE_PARM_DESC(create
, "Create fcoe port using net device passed in.");
1103 module_param_call(destroy
, fcoe_destroy
, NULL
, NULL
, S_IWUSR
);
1104 __MODULE_PARM_TYPE(destroy
, "string");
1105 MODULE_PARM_DESC(destroy
, "Destroy fcoe port");
1108 * fcoe_link_ok - check if link is ok for the fc_lport
1109 * @lp: ptr to the fc_lport
1111 * Any permanently-disqualifying conditions have been previously checked.
1112 * This also updates the speed setting, which may change with link for 100/1000.
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.
1118 * Returns: 0 if link is OK for use by FCoE.
1121 int fcoe_link_ok(struct fc_lport
*lp
)
1123 struct fcoe_softc
*fc
= fcoe_softc(lp
);
1124 struct net_device
*dev
= fc
->real_dev
;
1125 struct ethtool_cmd ecmd
= { ETHTOOL_GSET
};
1128 if ((dev
->flags
& IFF_UP
) && netif_carrier_ok(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
;
1150 EXPORT_SYMBOL_GPL(fcoe_link_ok
);
1153 * fcoe_percpu_clean - frees skb of the corresponding lport from the per
1157 void fcoe_percpu_clean(struct fc_lport
*lp
)
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
;
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
;
1172 for (skb
= head
; skb
!= (struct sk_buff
*)list
;
1175 fr
= fcoe_dev_from_skb(skb
);
1176 if (fr
->fr_dev
== lp
) {
1177 __skb_unlink(skb
, list
);
1181 spin_unlock_bh(&pp
->fcoe_rx_list
.lock
);
1185 EXPORT_SYMBOL_GPL(fcoe_percpu_clean
);
1188 * fcoe_clean_pending_queue - dequeue skb and free it
1189 * @lp: the corresponding fc_lport
1193 void fcoe_clean_pending_queue(struct fc_lport
*lp
)
1195 struct fcoe_softc
*fc
= lport_priv(lp
);
1196 struct sk_buff
*skb
;
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
);
1202 spin_lock_bh(&fc
->fcoe_pending_queue
.lock
);
1204 spin_unlock_bh(&fc
->fcoe_pending_queue
.lock
);
1206 EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue
);
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
1213 * Returns: ptr to Scsi_Host
1216 static inline struct Scsi_Host
*libfc_host_alloc(
1217 struct scsi_host_template
*sht
, int priv_size
)
1219 return scsi_host_alloc(sht
, sizeof(struct fc_lport
) + priv_size
);
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
1227 * Returns: ptr to Scsi_Host
1229 struct Scsi_Host
*fcoe_host_alloc(struct scsi_host_template
*sht
, int priv_size
)
1231 return libfc_host_alloc(sht
, sizeof(struct fcoe_softc
) + priv_size
);
1233 EXPORT_SYMBOL_GPL(fcoe_host_alloc
);
1236 * fcoe_reset - resets the fcoe
1237 * @shost: shost the reset is from
1241 int fcoe_reset(struct Scsi_Host
*shost
)
1243 struct fc_lport
*lport
= shost_priv(shost
);
1244 fc_lport_reset(lport
);
1247 EXPORT_SYMBOL_GPL(fcoe_reset
);
1250 * fcoe_wwn_from_mac - converts 48-bit IEEE MAC address to 64-bit FC WWN.
1252 * @scheme: check port
1253 * @port: port indicator for converting
1255 * Returns: u64 fc world wide name
1257 u64
fcoe_wwn_from_mac(unsigned char mac
[MAX_ADDR_LEN
],
1258 unsigned int scheme
, unsigned int port
)
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) |
1271 WARN_ON(host_mac
>= (1ULL << 48));
1272 wwn
= host_mac
| ((u64
) scheme
<< 60);
1278 WARN_ON(port
>= 0xfff);
1279 wwn
|= (u64
) port
<< 48;
1288 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac
);
1290 * fcoe_hostlist_lookup_softc - find the corresponding lport by a given device
1291 * @device: this is currently ptr to net_device
1293 * Returns: NULL or the located fcoe_softc
1295 static struct fcoe_softc
*fcoe_hostlist_lookup_softc(
1296 const struct net_device
*dev
)
1298 struct fcoe_softc
*fc
;
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
);
1307 read_unlock(&fcoe_hostlist_lock
);
1312 * fcoe_hostlist_lookup - find the corresponding lport by netdev
1313 * @netdev: ptr to net_device
1315 * Returns: 0 for success
1317 struct fc_lport
*fcoe_hostlist_lookup(const struct net_device
*netdev
)
1319 struct fcoe_softc
*fc
;
1321 fc
= fcoe_hostlist_lookup_softc(netdev
);
1323 return (fc
) ? fc
->lp
: NULL
;
1325 EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup
);
1328 * fcoe_hostlist_add - add a lport to lports list
1329 * @lp: ptr to the fc_lport to badded
1331 * Returns: 0 for success
1333 int fcoe_hostlist_add(const struct fc_lport
*lp
)
1335 struct fcoe_softc
*fc
;
1337 fc
= fcoe_hostlist_lookup_softc(fcoe_netdev(lp
));
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
);
1346 EXPORT_SYMBOL_GPL(fcoe_hostlist_add
);
1349 * fcoe_hostlist_remove - remove a lport from lports list
1350 * @lp: ptr to the fc_lport to badded
1352 * Returns: 0 for success
1354 int fcoe_hostlist_remove(const struct fc_lport
*lp
)
1356 struct fcoe_softc
*fc
;
1358 fc
= fcoe_hostlist_lookup_softc(fcoe_netdev(lp
));
1360 write_lock_bh(&fcoe_hostlist_lock
);
1361 list_del(&fc
->list
);
1362 write_unlock_bh(&fcoe_hostlist_lock
);
1366 EXPORT_SYMBOL_GPL(fcoe_hostlist_remove
);
1369 * fcoe_libfc_config - sets up libfc related properties for lport
1370 * @lp: ptr to the fc_lport
1371 * @tt: libfc function template
1373 * Returns : 0 for success
1375 int fcoe_libfc_config(struct fc_lport
*lp
, struct libfc_function_template
*tt
)
1377 /* Set the function pointers set by the LLDD */
1378 memcpy(&lp
->tt
, tt
, sizeof(*tt
));
1379 if (fc_fcp_init(lp
))
1389 EXPORT_SYMBOL_GPL(fcoe_libfc_config
);
1392 * fcoe_init - fcoe module loading initialization
1394 * Initialization routine
1395 * 1. Will create fc transport software structure
1396 * 2. initialize the link list of port information structure
1398 * Returns 0 on success, negative on failure
1400 static int __init
fcoe_init(void)
1403 struct fcoe_percpu_s
*p
;
1406 INIT_LIST_HEAD(&fcoe_hostlist
);
1407 rwlock_init(&fcoe_hostlist_lock
);
1409 #ifdef CONFIG_HOTPLUG_CPU
1410 register_cpu_notifier(&fcoe_cpu_notifier
);
1411 #endif /* CONFIG_HOTPLUG_CPU */
1414 * initialize per CPU interrupt thread
1416 for_each_online_cpu(cpu
) {
1417 p
= kzalloc(sizeof(struct fcoe_percpu_s
), GFP_KERNEL
);
1419 p
->thread
= kthread_create(fcoe_percpu_receive_thread
,
1421 "fcoethread/%d", cpu
);
1424 * if there is no error then bind the thread to the cpu
1425 * initialize the semaphore and skb queue head
1427 if (likely(!IS_ERR(p
->thread
))) {
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
);
1434 fcoe_percpu
[cpu
] = NULL
;
1442 * setup link change notification
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
);
1452 /* initiatlize the fcoe transport */
1453 fcoe_transport_init();
1459 module_init(fcoe_init
);
1462 * fcoe_exit - fcoe module unloading cleanup
1464 * Returns 0 on success, negative on failure
1466 static void __exit
fcoe_exit(void)
1469 struct fcoe_softc
*fc
, *tmp
;
1470 struct fcoe_percpu_s
*p
;
1471 struct sk_buff
*skb
;
1474 * Stop all call back interfaces
1476 #ifdef CONFIG_HOTPLUG_CPU
1477 unregister_cpu_notifier(&fcoe_cpu_notifier
);
1478 #endif /* CONFIG_HOTPLUG_CPU */
1484 del_timer_sync(&fcoe_timer
);
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
);
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
)
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
]);
1504 /* remove sw trasnport */
1507 /* detach the transport */
1508 fcoe_transport_exit();
1510 module_exit(fcoe_exit
);