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path: root/drivers/scsi/fnic/fnic_fcs.c
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Diffstat (limited to 'drivers/scsi/fnic/fnic_fcs.c')
-rw-r--r--drivers/scsi/fnic/fnic_fcs.c742
1 files changed, 742 insertions, 0 deletions
diff --git a/drivers/scsi/fnic/fnic_fcs.c b/drivers/scsi/fnic/fnic_fcs.c
new file mode 100644
index 000000000000..07e6eedb83ce
--- /dev/null
+++ b/drivers/scsi/fnic/fnic_fcs.c
@@ -0,0 +1,742 @@
1/*
2 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
4 *
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 */
18#include <linux/errno.h>
19#include <linux/pci.h>
20#include <linux/skbuff.h>
21#include <linux/interrupt.h>
22#include <linux/spinlock.h>
23#include <linux/if_ether.h>
24#include <linux/if_vlan.h>
25#include <linux/workqueue.h>
26#include <scsi/fc/fc_els.h>
27#include <scsi/fc/fc_fcoe.h>
28#include <scsi/fc_frame.h>
29#include <scsi/libfc.h>
30#include "fnic_io.h"
31#include "fnic.h"
32#include "cq_enet_desc.h"
33#include "cq_exch_desc.h"
34
35struct workqueue_struct *fnic_event_queue;
36
37void fnic_handle_link(struct work_struct *work)
38{
39 struct fnic *fnic = container_of(work, struct fnic, link_work);
40 unsigned long flags;
41 int old_link_status;
42 u32 old_link_down_cnt;
43
44 spin_lock_irqsave(&fnic->fnic_lock, flags);
45
46 if (fnic->stop_rx_link_events) {
47 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
48 return;
49 }
50
51 old_link_down_cnt = fnic->link_down_cnt;
52 old_link_status = fnic->link_status;
53 fnic->link_status = vnic_dev_link_status(fnic->vdev);
54 fnic->link_down_cnt = vnic_dev_link_down_cnt(fnic->vdev);
55
56 if (old_link_status == fnic->link_status) {
57 if (!fnic->link_status)
58 /* DOWN -> DOWN */
59 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
60 else {
61 if (old_link_down_cnt != fnic->link_down_cnt) {
62 /* UP -> DOWN -> UP */
63 fnic->lport->host_stats.link_failure_count++;
64 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
65 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
66 "link down\n");
67 fc_linkdown(fnic->lport);
68 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
69 "link up\n");
70 fc_linkup(fnic->lport);
71 } else
72 /* UP -> UP */
73 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
74 }
75 } else if (fnic->link_status) {
76 /* DOWN -> UP */
77 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
78 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link up\n");
79 fc_linkup(fnic->lport);
80 } else {
81 /* UP -> DOWN */
82 fnic->lport->host_stats.link_failure_count++;
83 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
84 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host, "link down\n");
85 fc_linkdown(fnic->lport);
86 }
87
88}
89
90/*
91 * This function passes incoming fabric frames to libFC
92 */
93void fnic_handle_frame(struct work_struct *work)
94{
95 struct fnic *fnic = container_of(work, struct fnic, frame_work);
96 struct fc_lport *lp = fnic->lport;
97 unsigned long flags;
98 struct sk_buff *skb;
99 struct fc_frame *fp;
100
101 while ((skb = skb_dequeue(&fnic->frame_queue))) {
102
103 spin_lock_irqsave(&fnic->fnic_lock, flags);
104 if (fnic->stop_rx_link_events) {
105 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
106 dev_kfree_skb(skb);
107 return;
108 }
109 fp = (struct fc_frame *)skb;
110 /* if Flogi resp frame, register the address */
111 if (fr_flags(fp)) {
112 vnic_dev_add_addr(fnic->vdev,
113 fnic->data_src_addr);
114 fr_flags(fp) = 0;
115 }
116 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
117
118 fc_exch_recv(lp, lp->emp, fp);
119 }
120
121}
122
123static inline void fnic_import_rq_fc_frame(struct sk_buff *skb,
124 u32 len, u8 sof, u8 eof)
125{
126 struct fc_frame *fp = (struct fc_frame *)skb;
127
128 skb_trim(skb, len);
129 fr_eof(fp) = eof;
130 fr_sof(fp) = sof;
131}
132
133
134static inline int fnic_import_rq_eth_pkt(struct sk_buff *skb, u32 len)
135{
136 struct fc_frame *fp;
137 struct ethhdr *eh;
138 struct vlan_ethhdr *vh;
139 struct fcoe_hdr *fcoe_hdr;
140 struct fcoe_crc_eof *ft;
141 u32 transport_len = 0;
142
143 eh = (struct ethhdr *)skb->data;
144 vh = (struct vlan_ethhdr *)skb->data;
145 if (vh->h_vlan_proto == htons(ETH_P_8021Q) &&
146 vh->h_vlan_encapsulated_proto == htons(ETH_P_FCOE)) {
147 skb_pull(skb, sizeof(struct vlan_ethhdr));
148 transport_len += sizeof(struct vlan_ethhdr);
149 } else if (eh->h_proto == htons(ETH_P_FCOE)) {
150 transport_len += sizeof(struct ethhdr);
151 skb_pull(skb, sizeof(struct ethhdr));
152 } else
153 return -1;
154
155 fcoe_hdr = (struct fcoe_hdr *)skb->data;
156 if (FC_FCOE_DECAPS_VER(fcoe_hdr) != FC_FCOE_VER)
157 return -1;
158
159 fp = (struct fc_frame *)skb;
160 fc_frame_init(fp);
161 fr_sof(fp) = fcoe_hdr->fcoe_sof;
162 skb_pull(skb, sizeof(struct fcoe_hdr));
163 transport_len += sizeof(struct fcoe_hdr);
164
165 ft = (struct fcoe_crc_eof *)(skb->data + len -
166 transport_len - sizeof(*ft));
167 fr_eof(fp) = ft->fcoe_eof;
168 skb_trim(skb, len - transport_len - sizeof(*ft));
169 return 0;
170}
171
172static inline int fnic_handle_flogi_resp(struct fnic *fnic,
173 struct fc_frame *fp)
174{
175 u8 mac[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
176 struct ethhdr *eth_hdr;
177 struct fc_frame_header *fh;
178 int ret = 0;
179 unsigned long flags;
180 struct fc_frame *old_flogi_resp = NULL;
181
182 fh = (struct fc_frame_header *)fr_hdr(fp);
183
184 spin_lock_irqsave(&fnic->fnic_lock, flags);
185
186 if (fnic->state == FNIC_IN_ETH_MODE) {
187
188 /*
189 * Check if oxid matches on taking the lock. A new Flogi
190 * issued by libFC might have changed the fnic cached oxid
191 */
192 if (fnic->flogi_oxid != ntohs(fh->fh_ox_id)) {
193 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
194 "Flogi response oxid not"
195 " matching cached oxid, dropping frame"
196 "\n");
197 ret = -1;
198 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
199 dev_kfree_skb_irq(fp_skb(fp));
200 goto handle_flogi_resp_end;
201 }
202
203 /* Drop older cached flogi response frame, cache this frame */
204 old_flogi_resp = fnic->flogi_resp;
205 fnic->flogi_resp = fp;
206 fnic->flogi_oxid = FC_XID_UNKNOWN;
207
208 /*
209 * this frame is part of flogi get the src mac addr from this
210 * frame if the src mac is fcoui based then we mark the
211 * address mode flag to use fcoui base for dst mac addr
212 * otherwise we have to store the fcoe gateway addr
213 */
214 eth_hdr = (struct ethhdr *)skb_mac_header(fp_skb(fp));
215 memcpy(mac, eth_hdr->h_source, ETH_ALEN);
216
217 if (ntoh24(mac) == FC_FCOE_OUI)
218 fnic->fcoui_mode = 1;
219 else {
220 fnic->fcoui_mode = 0;
221 memcpy(fnic->dest_addr, mac, ETH_ALEN);
222 }
223
224 /*
225 * Except for Flogi frame, all outbound frames from us have the
226 * Eth Src address as FC_FCOE_OUI"our_sid". Flogi frame uses
227 * the vnic MAC address as the Eth Src address
228 */
229 fc_fcoe_set_mac(fnic->data_src_addr, fh->fh_d_id);
230
231 /* We get our s_id from the d_id of the flogi resp frame */
232 fnic->s_id = ntoh24(fh->fh_d_id);
233
234 /* Change state to reflect transition from Eth to FC mode */
235 fnic->state = FNIC_IN_ETH_TRANS_FC_MODE;
236
237 } else {
238 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
239 "Unexpected fnic state %s while"
240 " processing flogi resp\n",
241 fnic_state_to_str(fnic->state));
242 ret = -1;
243 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
244 dev_kfree_skb_irq(fp_skb(fp));
245 goto handle_flogi_resp_end;
246 }
247
248 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
249
250 /* Drop older cached frame */
251 if (old_flogi_resp)
252 dev_kfree_skb_irq(fp_skb(old_flogi_resp));
253
254 /*
255 * send flogi reg request to firmware, this will put the fnic in
256 * in FC mode
257 */
258 ret = fnic_flogi_reg_handler(fnic);
259
260 if (ret < 0) {
261 int free_fp = 1;
262 spin_lock_irqsave(&fnic->fnic_lock, flags);
263 /*
264 * free the frame is some other thread is not
265 * pointing to it
266 */
267 if (fnic->flogi_resp != fp)
268 free_fp = 0;
269 else
270 fnic->flogi_resp = NULL;
271
272 if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE)
273 fnic->state = FNIC_IN_ETH_MODE;
274 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
275 if (free_fp)
276 dev_kfree_skb_irq(fp_skb(fp));
277 }
278
279 handle_flogi_resp_end:
280 return ret;
281}
282
283/* Returns 1 for a response that matches cached flogi oxid */
284static inline int is_matching_flogi_resp_frame(struct fnic *fnic,
285 struct fc_frame *fp)
286{
287 struct fc_frame_header *fh;
288 int ret = 0;
289 u32 f_ctl;
290
291 fh = fc_frame_header_get(fp);
292 f_ctl = ntoh24(fh->fh_f_ctl);
293
294 if (fnic->flogi_oxid == ntohs(fh->fh_ox_id) &&
295 fh->fh_r_ctl == FC_RCTL_ELS_REP &&
296 (f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == FC_FC_EX_CTX &&
297 fh->fh_type == FC_TYPE_ELS)
298 ret = 1;
299
300 return ret;
301}
302
303static void fnic_rq_cmpl_frame_recv(struct vnic_rq *rq, struct cq_desc
304 *cq_desc, struct vnic_rq_buf *buf,
305 int skipped __attribute__((unused)),
306 void *opaque)
307{
308 struct fnic *fnic = vnic_dev_priv(rq->vdev);
309 struct sk_buff *skb;
310 struct fc_frame *fp;
311 unsigned int eth_hdrs_stripped;
312 u8 type, color, eop, sop, ingress_port, vlan_stripped;
313 u8 fcoe = 0, fcoe_sof, fcoe_eof;
314 u8 fcoe_fc_crc_ok = 1, fcoe_enc_error = 0;
315 u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
316 u8 ipv6, ipv4, ipv4_fragment, rss_type, csum_not_calc;
317 u8 fcs_ok = 1, packet_error = 0;
318 u16 q_number, completed_index, bytes_written = 0, vlan, checksum;
319 u32 rss_hash;
320 u16 exchange_id, tmpl;
321 u8 sof = 0;
322 u8 eof = 0;
323 u32 fcp_bytes_written = 0;
324 unsigned long flags;
325
326 pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
327 PCI_DMA_FROMDEVICE);
328 skb = buf->os_buf;
329 buf->os_buf = NULL;
330
331 cq_desc_dec(cq_desc, &type, &color, &q_number, &completed_index);
332 if (type == CQ_DESC_TYPE_RQ_FCP) {
333 cq_fcp_rq_desc_dec((struct cq_fcp_rq_desc *)cq_desc,
334 &type, &color, &q_number, &completed_index,
335 &eop, &sop, &fcoe_fc_crc_ok, &exchange_id,
336 &tmpl, &fcp_bytes_written, &sof, &eof,
337 &ingress_port, &packet_error,
338 &fcoe_enc_error, &fcs_ok, &vlan_stripped,
339 &vlan);
340 eth_hdrs_stripped = 1;
341
342 } else if (type == CQ_DESC_TYPE_RQ_ENET) {
343 cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
344 &type, &color, &q_number, &completed_index,
345 &ingress_port, &fcoe, &eop, &sop,
346 &rss_type, &csum_not_calc, &rss_hash,
347 &bytes_written, &packet_error,
348 &vlan_stripped, &vlan, &checksum,
349 &fcoe_sof, &fcoe_fc_crc_ok,
350 &fcoe_enc_error, &fcoe_eof,
351 &tcp_udp_csum_ok, &udp, &tcp,
352 &ipv4_csum_ok, &ipv6, &ipv4,
353 &ipv4_fragment, &fcs_ok);
354 eth_hdrs_stripped = 0;
355
356 } else {
357 /* wrong CQ type*/
358 shost_printk(KERN_ERR, fnic->lport->host,
359 "fnic rq_cmpl wrong cq type x%x\n", type);
360 goto drop;
361 }
362
363 if (!fcs_ok || packet_error || !fcoe_fc_crc_ok || fcoe_enc_error) {
364 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
365 "fnic rq_cmpl fcoe x%x fcsok x%x"
366 " pkterr x%x fcoe_fc_crc_ok x%x, fcoe_enc_err"
367 " x%x\n",
368 fcoe, fcs_ok, packet_error,
369 fcoe_fc_crc_ok, fcoe_enc_error);
370 goto drop;
371 }
372
373 if (eth_hdrs_stripped)
374 fnic_import_rq_fc_frame(skb, fcp_bytes_written, sof, eof);
375 else if (fnic_import_rq_eth_pkt(skb, bytes_written))
376 goto drop;
377
378 fp = (struct fc_frame *)skb;
379
380 /*
381 * If frame is an ELS response that matches the cached FLOGI OX_ID,
382 * and is accept, issue flogi_reg_request copy wq request to firmware
383 * to register the S_ID and determine whether FC_OUI mode or GW mode.
384 */
385 if (is_matching_flogi_resp_frame(fnic, fp)) {
386 if (!eth_hdrs_stripped) {
387 if (fc_frame_payload_op(fp) == ELS_LS_ACC) {
388 fnic_handle_flogi_resp(fnic, fp);
389 return;
390 }
391 /*
392 * Recd. Flogi reject. No point registering
393 * with fw, but forward to libFC
394 */
395 goto forward;
396 }
397 goto drop;
398 }
399 if (!eth_hdrs_stripped)
400 goto drop;
401
402forward:
403 spin_lock_irqsave(&fnic->fnic_lock, flags);
404 if (fnic->stop_rx_link_events) {
405 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
406 goto drop;
407 }
408 /* Use fr_flags to indicate whether succ. flogi resp or not */
409 fr_flags(fp) = 0;
410 fr_dev(fp) = fnic->lport;
411 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
412
413 skb_queue_tail(&fnic->frame_queue, skb);
414 queue_work(fnic_event_queue, &fnic->frame_work);
415
416 return;
417drop:
418 dev_kfree_skb_irq(skb);
419}
420
421static int fnic_rq_cmpl_handler_cont(struct vnic_dev *vdev,
422 struct cq_desc *cq_desc, u8 type,
423 u16 q_number, u16 completed_index,
424 void *opaque)
425{
426 struct fnic *fnic = vnic_dev_priv(vdev);
427
428 vnic_rq_service(&fnic->rq[q_number], cq_desc, completed_index,
429 VNIC_RQ_RETURN_DESC, fnic_rq_cmpl_frame_recv,
430 NULL);
431 return 0;
432}
433
434int fnic_rq_cmpl_handler(struct fnic *fnic, int rq_work_to_do)
435{
436 unsigned int tot_rq_work_done = 0, cur_work_done;
437 unsigned int i;
438 int err;
439
440 for (i = 0; i < fnic->rq_count; i++) {
441 cur_work_done = vnic_cq_service(&fnic->cq[i], rq_work_to_do,
442 fnic_rq_cmpl_handler_cont,
443 NULL);
444 if (cur_work_done) {
445 err = vnic_rq_fill(&fnic->rq[i], fnic_alloc_rq_frame);
446 if (err)
447 shost_printk(KERN_ERR, fnic->lport->host,
448 "fnic_alloc_rq_frame cant alloc"
449 " frame\n");
450 }
451 tot_rq_work_done += cur_work_done;
452 }
453
454 return tot_rq_work_done;
455}
456
457/*
458 * This function is called once at init time to allocate and fill RQ
459 * buffers. Subsequently, it is called in the interrupt context after RQ
460 * buffer processing to replenish the buffers in the RQ
461 */
462int fnic_alloc_rq_frame(struct vnic_rq *rq)
463{
464 struct fnic *fnic = vnic_dev_priv(rq->vdev);
465 struct sk_buff *skb;
466 u16 len;
467 dma_addr_t pa;
468
469 len = FC_FRAME_HEADROOM + FC_MAX_FRAME + FC_FRAME_TAILROOM;
470 skb = dev_alloc_skb(len);
471 if (!skb) {
472 FNIC_FCS_DBG(KERN_DEBUG, fnic->lport->host,
473 "Unable to allocate RQ sk_buff\n");
474 return -ENOMEM;
475 }
476 skb_reset_mac_header(skb);
477 skb_reset_transport_header(skb);
478 skb_reset_network_header(skb);
479 skb_put(skb, len);
480 pa = pci_map_single(fnic->pdev, skb->data, len, PCI_DMA_FROMDEVICE);
481 fnic_queue_rq_desc(rq, skb, pa, len);
482 return 0;
483}
484
485void fnic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
486{
487 struct fc_frame *fp = buf->os_buf;
488 struct fnic *fnic = vnic_dev_priv(rq->vdev);
489
490 pci_unmap_single(fnic->pdev, buf->dma_addr, buf->len,
491 PCI_DMA_FROMDEVICE);
492
493 dev_kfree_skb(fp_skb(fp));
494 buf->os_buf = NULL;
495}
496
497static inline int is_flogi_frame(struct fc_frame_header *fh)
498{
499 return fh->fh_r_ctl == FC_RCTL_ELS_REQ && *(u8 *)(fh + 1) == ELS_FLOGI;
500}
501
502int fnic_send_frame(struct fnic *fnic, struct fc_frame *fp)
503{
504 struct vnic_wq *wq = &fnic->wq[0];
505 struct sk_buff *skb;
506 dma_addr_t pa;
507 struct ethhdr *eth_hdr;
508 struct vlan_ethhdr *vlan_hdr;
509 struct fcoe_hdr *fcoe_hdr;
510 struct fc_frame_header *fh;
511 u32 tot_len, eth_hdr_len;
512 int ret = 0;
513 unsigned long flags;
514
515 fh = fc_frame_header_get(fp);
516 skb = fp_skb(fp);
517
518 if (!fnic->vlan_hw_insert) {
519 eth_hdr_len = sizeof(*vlan_hdr) + sizeof(*fcoe_hdr);
520 vlan_hdr = (struct vlan_ethhdr *)skb_push(skb, eth_hdr_len);
521 eth_hdr = (struct ethhdr *)vlan_hdr;
522 vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
523 vlan_hdr->h_vlan_encapsulated_proto = htons(ETH_P_FCOE);
524 vlan_hdr->h_vlan_TCI = htons(fnic->vlan_id);
525 fcoe_hdr = (struct fcoe_hdr *)(vlan_hdr + 1);
526 } else {
527 eth_hdr_len = sizeof(*eth_hdr) + sizeof(*fcoe_hdr);
528 eth_hdr = (struct ethhdr *)skb_push(skb, eth_hdr_len);
529 eth_hdr->h_proto = htons(ETH_P_FCOE);
530 fcoe_hdr = (struct fcoe_hdr *)(eth_hdr + 1);
531 }
532
533 if (is_flogi_frame(fh)) {
534 fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
535 memcpy(eth_hdr->h_source, fnic->mac_addr, ETH_ALEN);
536 } else {
537 if (fnic->fcoui_mode)
538 fc_fcoe_set_mac(eth_hdr->h_dest, fh->fh_d_id);
539 else
540 memcpy(eth_hdr->h_dest, fnic->dest_addr, ETH_ALEN);
541 memcpy(eth_hdr->h_source, fnic->data_src_addr, ETH_ALEN);
542 }
543
544 tot_len = skb->len;
545 BUG_ON(tot_len % 4);
546
547 memset(fcoe_hdr, 0, sizeof(*fcoe_hdr));
548 fcoe_hdr->fcoe_sof = fr_sof(fp);
549 if (FC_FCOE_VER)
550 FC_FCOE_ENCAPS_VER(fcoe_hdr, FC_FCOE_VER);
551
552 pa = pci_map_single(fnic->pdev, eth_hdr, tot_len, PCI_DMA_TODEVICE);
553
554 spin_lock_irqsave(&fnic->wq_lock[0], flags);
555
556 if (!vnic_wq_desc_avail(wq)) {
557 pci_unmap_single(fnic->pdev, pa,
558 tot_len, PCI_DMA_TODEVICE);
559 ret = -1;
560 goto fnic_send_frame_end;
561 }
562
563 fnic_queue_wq_desc(wq, skb, pa, tot_len, fr_eof(fp),
564 fnic->vlan_hw_insert, fnic->vlan_id, 1, 1, 1);
565fnic_send_frame_end:
566 spin_unlock_irqrestore(&fnic->wq_lock[0], flags);
567
568 if (ret)
569 dev_kfree_skb_any(fp_skb(fp));
570
571 return ret;
572}
573
574/*
575 * fnic_send
576 * Routine to send a raw frame
577 */
578int fnic_send(struct fc_lport *lp, struct fc_frame *fp)
579{
580 struct fnic *fnic = lport_priv(lp);
581 struct fc_frame_header *fh;
582 int ret = 0;
583 enum fnic_state old_state;
584 unsigned long flags;
585 struct fc_frame *old_flogi = NULL;
586 struct fc_frame *old_flogi_resp = NULL;
587
588 if (fnic->in_remove) {
589 dev_kfree_skb(fp_skb(fp));
590 ret = -1;
591 goto fnic_send_end;
592 }
593
594 fh = fc_frame_header_get(fp);
595 /* if not an Flogi frame, send it out, this is the common case */
596 if (!is_flogi_frame(fh))
597 return fnic_send_frame(fnic, fp);
598
599 /* Flogi frame, now enter the state machine */
600
601 spin_lock_irqsave(&fnic->fnic_lock, flags);
602again:
603 /* Get any old cached frames, free them after dropping lock */
604 old_flogi = fnic->flogi;
605 fnic->flogi = NULL;
606 old_flogi_resp = fnic->flogi_resp;
607 fnic->flogi_resp = NULL;
608
609 fnic->flogi_oxid = FC_XID_UNKNOWN;
610
611 old_state = fnic->state;
612 switch (old_state) {
613 case FNIC_IN_FC_MODE:
614 case FNIC_IN_ETH_TRANS_FC_MODE:
615 default:
616 fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
617 vnic_dev_del_addr(fnic->vdev, fnic->data_src_addr);
618 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
619
620 if (old_flogi) {
621 dev_kfree_skb(fp_skb(old_flogi));
622 old_flogi = NULL;
623 }
624 if (old_flogi_resp) {
625 dev_kfree_skb(fp_skb(old_flogi_resp));
626 old_flogi_resp = NULL;
627 }
628
629 ret = fnic_fw_reset_handler(fnic);
630
631 spin_lock_irqsave(&fnic->fnic_lock, flags);
632 if (fnic->state != FNIC_IN_FC_TRANS_ETH_MODE)
633 goto again;
634 if (ret) {
635 fnic->state = old_state;
636 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
637 dev_kfree_skb(fp_skb(fp));
638 goto fnic_send_end;
639 }
640 old_flogi = fnic->flogi;
641 fnic->flogi = fp;
642 fnic->flogi_oxid = ntohs(fh->fh_ox_id);
643 old_flogi_resp = fnic->flogi_resp;
644 fnic->flogi_resp = NULL;
645 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
646 break;
647
648 case FNIC_IN_FC_TRANS_ETH_MODE:
649 /*
650 * A reset is pending with the firmware. Store the flogi
651 * and its oxid. The transition out of this state happens
652 * only when Firmware completes the reset, either with
653 * success or failed. If success, transition to
654 * FNIC_IN_ETH_MODE, if fail, then transition to
655 * FNIC_IN_FC_MODE
656 */
657 fnic->flogi = fp;
658 fnic->flogi_oxid = ntohs(fh->fh_ox_id);
659 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
660 break;
661
662 case FNIC_IN_ETH_MODE:
663 /*
664 * The fw/hw is already in eth mode. Store the oxid,
665 * and send the flogi frame out. The transition out of this
666 * state happens only we receive flogi response from the
667 * network, and the oxid matches the cached oxid when the
668 * flogi frame was sent out. If they match, then we issue
669 * a flogi_reg request and transition to state
670 * FNIC_IN_ETH_TRANS_FC_MODE
671 */
672 fnic->flogi_oxid = ntohs(fh->fh_ox_id);
673 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
674 ret = fnic_send_frame(fnic, fp);
675 break;
676 }
677
678fnic_send_end:
679 if (old_flogi)
680 dev_kfree_skb(fp_skb(old_flogi));
681 if (old_flogi_resp)
682 dev_kfree_skb(fp_skb(old_flogi_resp));
683 return ret;
684}
685
686static void fnic_wq_complete_frame_send(struct vnic_wq *wq,
687 struct cq_desc *cq_desc,
688 struct vnic_wq_buf *buf, void *opaque)
689{
690 struct sk_buff *skb = buf->os_buf;
691 struct fc_frame *fp = (struct fc_frame *)skb;
692 struct fnic *fnic = vnic_dev_priv(wq->vdev);
693
694 pci_unmap_single(fnic->pdev, buf->dma_addr,
695 buf->len, PCI_DMA_TODEVICE);
696 dev_kfree_skb_irq(fp_skb(fp));
697 buf->os_buf = NULL;
698}
699
700static int fnic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
701 struct cq_desc *cq_desc, u8 type,
702 u16 q_number, u16 completed_index,
703 void *opaque)
704{
705 struct fnic *fnic = vnic_dev_priv(vdev);
706 unsigned long flags;
707
708 spin_lock_irqsave(&fnic->wq_lock[q_number], flags);
709 vnic_wq_service(&fnic->wq[q_number], cq_desc, completed_index,
710 fnic_wq_complete_frame_send, NULL);
711 spin_unlock_irqrestore(&fnic->wq_lock[q_number], flags);
712
713 return 0;
714}
715
716int fnic_wq_cmpl_handler(struct fnic *fnic, int work_to_do)
717{
718 unsigned int wq_work_done = 0;
719 unsigned int i;
720
721 for (i = 0; i < fnic->raw_wq_count; i++) {
722 wq_work_done += vnic_cq_service(&fnic->cq[fnic->rq_count+i],
723 work_to_do,
724 fnic_wq_cmpl_handler_cont,
725 NULL);
726 }
727
728 return wq_work_done;
729}
730
731
732void fnic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
733{
734 struct fc_frame *fp = buf->os_buf;
735 struct fnic *fnic = vnic_dev_priv(wq->vdev);
736
737 pci_unmap_single(fnic->pdev, buf->dma_addr,
738 buf->len, PCI_DMA_TODEVICE);
739
740 dev_kfree_skb(fp_skb(fp));
741 buf->os_buf = NULL;
742}
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-16 16:53:33 -0500