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4f80fc77 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c5343203 JS |
2 | /* |
3 | * Copyright (c) 2016 Avago Technologies. All rights reserved. | |
c5343203 JS |
4 | */ |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
6 | #include <linux/module.h> | |
7 | #include <linux/slab.h> | |
8 | #include <linux/blk-mq.h> | |
9 | #include <linux/parser.h> | |
10 | #include <linux/random.h> | |
11 | #include <uapi/scsi/fc/fc_fs.h> | |
12 | #include <uapi/scsi/fc/fc_els.h> | |
13 | ||
14 | #include "nvmet.h" | |
15 | #include <linux/nvme-fc-driver.h> | |
16 | #include <linux/nvme-fc.h> | |
17 | ||
18 | ||
19 | /* *************************** Data Structures/Defines ****************** */ | |
20 | ||
21 | ||
17d78252 | 22 | #define NVMET_LS_CTX_COUNT 256 |
c5343203 JS |
23 | |
24 | /* for this implementation, assume small single frame rqst/rsp */ | |
25 | #define NVME_FC_MAX_LS_BUFFER_SIZE 2048 | |
26 | ||
27 | struct nvmet_fc_tgtport; | |
28 | struct nvmet_fc_tgt_assoc; | |
29 | ||
30 | struct nvmet_fc_ls_iod { | |
31 | struct nvmefc_tgt_ls_req *lsreq; | |
32 | struct nvmefc_tgt_fcp_req *fcpreq; /* only if RS */ | |
33 | ||
34 | struct list_head ls_list; /* tgtport->ls_list */ | |
35 | ||
36 | struct nvmet_fc_tgtport *tgtport; | |
37 | struct nvmet_fc_tgt_assoc *assoc; | |
38 | ||
39 | u8 *rqstbuf; | |
40 | u8 *rspbuf; | |
41 | u16 rqstdatalen; | |
42 | dma_addr_t rspdma; | |
43 | ||
44 | struct scatterlist sg[2]; | |
45 | ||
46 | struct work_struct work; | |
47 | } __aligned(sizeof(unsigned long long)); | |
48 | ||
d082dc15 | 49 | /* desired maximum for a single sequence - if sg list allows it */ |
48fa362b | 50 | #define NVMET_FC_MAX_SEQ_LENGTH (256 * 1024) |
c5343203 JS |
51 | |
52 | enum nvmet_fcp_datadir { | |
53 | NVMET_FCP_NODATA, | |
54 | NVMET_FCP_WRITE, | |
55 | NVMET_FCP_READ, | |
56 | NVMET_FCP_ABORTED, | |
57 | }; | |
58 | ||
59 | struct nvmet_fc_fcp_iod { | |
60 | struct nvmefc_tgt_fcp_req *fcpreq; | |
61 | ||
62 | struct nvme_fc_cmd_iu cmdiubuf; | |
63 | struct nvme_fc_ersp_iu rspiubuf; | |
64 | dma_addr_t rspdma; | |
d082dc15 | 65 | struct scatterlist *next_sg; |
c5343203 | 66 | struct scatterlist *data_sg; |
c5343203 | 67 | int data_sg_cnt; |
c5343203 JS |
68 | u32 offset; |
69 | enum nvmet_fcp_datadir io_dir; | |
70 | bool active; | |
71 | bool abort; | |
a97ec51b JS |
72 | bool aborted; |
73 | bool writedataactive; | |
c5343203 JS |
74 | spinlock_t flock; |
75 | ||
76 | struct nvmet_req req; | |
9d625f77 | 77 | struct work_struct defer_work; |
c5343203 JS |
78 | |
79 | struct nvmet_fc_tgtport *tgtport; | |
80 | struct nvmet_fc_tgt_queue *queue; | |
81 | ||
82 | struct list_head fcp_list; /* tgtport->fcp_list */ | |
83 | }; | |
84 | ||
85 | struct nvmet_fc_tgtport { | |
86 | ||
87 | struct nvmet_fc_target_port fc_target_port; | |
88 | ||
89 | struct list_head tgt_list; /* nvmet_fc_target_list */ | |
90 | struct device *dev; /* dev for dma mapping */ | |
91 | struct nvmet_fc_target_template *ops; | |
92 | ||
93 | struct nvmet_fc_ls_iod *iod; | |
94 | spinlock_t lock; | |
95 | struct list_head ls_list; | |
96 | struct list_head ls_busylist; | |
97 | struct list_head assoc_list; | |
98 | struct ida assoc_cnt; | |
ea96d649 | 99 | struct nvmet_fc_port_entry *pe; |
c5343203 | 100 | struct kref ref; |
48fa362b | 101 | u32 max_sg_cnt; |
c5343203 JS |
102 | }; |
103 | ||
ea96d649 JS |
104 | struct nvmet_fc_port_entry { |
105 | struct nvmet_fc_tgtport *tgtport; | |
106 | struct nvmet_port *port; | |
107 | u64 node_name; | |
108 | u64 port_name; | |
109 | struct list_head pe_list; | |
110 | }; | |
111 | ||
0fb228d3 JS |
112 | struct nvmet_fc_defer_fcp_req { |
113 | struct list_head req_list; | |
114 | struct nvmefc_tgt_fcp_req *fcp_req; | |
115 | }; | |
116 | ||
c5343203 JS |
117 | struct nvmet_fc_tgt_queue { |
118 | bool ninetypercent; | |
119 | u16 qid; | |
120 | u16 sqsize; | |
121 | u16 ersp_ratio; | |
f63688a6 | 122 | __le16 sqhd; |
c5343203 JS |
123 | atomic_t connected; |
124 | atomic_t sqtail; | |
125 | atomic_t zrspcnt; | |
126 | atomic_t rsn; | |
127 | spinlock_t qlock; | |
c5343203 JS |
128 | struct nvmet_cq nvme_cq; |
129 | struct nvmet_sq nvme_sq; | |
130 | struct nvmet_fc_tgt_assoc *assoc; | |
131 | struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */ | |
132 | struct list_head fod_list; | |
0fb228d3 JS |
133 | struct list_head pending_cmd_list; |
134 | struct list_head avail_defer_list; | |
c5343203 JS |
135 | struct workqueue_struct *work_q; |
136 | struct kref ref; | |
137 | } __aligned(sizeof(unsigned long long)); | |
138 | ||
139 | struct nvmet_fc_tgt_assoc { | |
140 | u64 association_id; | |
141 | u32 a_id; | |
142 | struct nvmet_fc_tgtport *tgtport; | |
143 | struct list_head a_list; | |
deb61742 | 144 | struct nvmet_fc_tgt_queue *queues[NVMET_NR_QUEUES + 1]; |
c5343203 | 145 | struct kref ref; |
a96d4bd8 | 146 | struct work_struct del_work; |
c5343203 JS |
147 | }; |
148 | ||
149 | ||
150 | static inline int | |
151 | nvmet_fc_iodnum(struct nvmet_fc_ls_iod *iodptr) | |
152 | { | |
153 | return (iodptr - iodptr->tgtport->iod); | |
154 | } | |
155 | ||
156 | static inline int | |
157 | nvmet_fc_fodnum(struct nvmet_fc_fcp_iod *fodptr) | |
158 | { | |
159 | return (fodptr - fodptr->queue->fod); | |
160 | } | |
161 | ||
162 | ||
163 | /* | |
164 | * Association and Connection IDs: | |
165 | * | |
166 | * Association ID will have random number in upper 6 bytes and zero | |
167 | * in lower 2 bytes | |
168 | * | |
169 | * Connection IDs will be Association ID with QID or'd in lower 2 bytes | |
170 | * | |
171 | * note: Association ID = Connection ID for queue 0 | |
172 | */ | |
173 | #define BYTES_FOR_QID sizeof(u16) | |
174 | #define BYTES_FOR_QID_SHIFT (BYTES_FOR_QID * 8) | |
175 | #define NVMET_FC_QUEUEID_MASK ((u64)((1 << BYTES_FOR_QID_SHIFT) - 1)) | |
176 | ||
177 | static inline u64 | |
178 | nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid) | |
179 | { | |
180 | return (assoc->association_id | qid); | |
181 | } | |
182 | ||
183 | static inline u64 | |
184 | nvmet_fc_getassociationid(u64 connectionid) | |
185 | { | |
186 | return connectionid & ~NVMET_FC_QUEUEID_MASK; | |
187 | } | |
188 | ||
189 | static inline u16 | |
190 | nvmet_fc_getqueueid(u64 connectionid) | |
191 | { | |
192 | return (u16)(connectionid & NVMET_FC_QUEUEID_MASK); | |
193 | } | |
194 | ||
195 | static inline struct nvmet_fc_tgtport * | |
196 | targetport_to_tgtport(struct nvmet_fc_target_port *targetport) | |
197 | { | |
198 | return container_of(targetport, struct nvmet_fc_tgtport, | |
199 | fc_target_port); | |
200 | } | |
201 | ||
202 | static inline struct nvmet_fc_fcp_iod * | |
203 | nvmet_req_to_fod(struct nvmet_req *nvme_req) | |
204 | { | |
205 | return container_of(nvme_req, struct nvmet_fc_fcp_iod, req); | |
206 | } | |
207 | ||
208 | ||
209 | /* *************************** Globals **************************** */ | |
210 | ||
211 | ||
212 | static DEFINE_SPINLOCK(nvmet_fc_tgtlock); | |
213 | ||
214 | static LIST_HEAD(nvmet_fc_target_list); | |
215 | static DEFINE_IDA(nvmet_fc_tgtport_cnt); | |
ea96d649 | 216 | static LIST_HEAD(nvmet_fc_portentry_list); |
c5343203 JS |
217 | |
218 | ||
219 | static void nvmet_fc_handle_ls_rqst_work(struct work_struct *work); | |
9d625f77 | 220 | static void nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work); |
c5343203 JS |
221 | static void nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc); |
222 | static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc); | |
223 | static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue); | |
224 | static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue); | |
225 | static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport); | |
226 | static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport); | |
0fb228d3 JS |
227 | static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, |
228 | struct nvmet_fc_fcp_iod *fod); | |
a96d4bd8 | 229 | static void nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc); |
c5343203 JS |
230 | |
231 | ||
232 | /* *********************** FC-NVME DMA Handling **************************** */ | |
233 | ||
234 | /* | |
235 | * The fcloop device passes in a NULL device pointer. Real LLD's will | |
236 | * pass in a valid device pointer. If NULL is passed to the dma mapping | |
237 | * routines, depending on the platform, it may or may not succeed, and | |
238 | * may crash. | |
239 | * | |
240 | * As such: | |
241 | * Wrapper all the dma routines and check the dev pointer. | |
242 | * | |
243 | * If simple mappings (return just a dma address, we'll noop them, | |
244 | * returning a dma address of 0. | |
245 | * | |
246 | * On more complex mappings (dma_map_sg), a pseudo routine fills | |
247 | * in the scatter list, setting all dma addresses to 0. | |
248 | */ | |
249 | ||
250 | static inline dma_addr_t | |
251 | fc_dma_map_single(struct device *dev, void *ptr, size_t size, | |
252 | enum dma_data_direction dir) | |
253 | { | |
254 | return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; | |
255 | } | |
256 | ||
257 | static inline int | |
258 | fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) | |
259 | { | |
260 | return dev ? dma_mapping_error(dev, dma_addr) : 0; | |
261 | } | |
262 | ||
263 | static inline void | |
264 | fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, | |
265 | enum dma_data_direction dir) | |
266 | { | |
267 | if (dev) | |
268 | dma_unmap_single(dev, addr, size, dir); | |
269 | } | |
270 | ||
271 | static inline void | |
272 | fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, | |
273 | enum dma_data_direction dir) | |
274 | { | |
275 | if (dev) | |
276 | dma_sync_single_for_cpu(dev, addr, size, dir); | |
277 | } | |
278 | ||
279 | static inline void | |
280 | fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, | |
281 | enum dma_data_direction dir) | |
282 | { | |
283 | if (dev) | |
284 | dma_sync_single_for_device(dev, addr, size, dir); | |
285 | } | |
286 | ||
287 | /* pseudo dma_map_sg call */ | |
288 | static int | |
289 | fc_map_sg(struct scatterlist *sg, int nents) | |
290 | { | |
291 | struct scatterlist *s; | |
292 | int i; | |
293 | ||
294 | WARN_ON(nents == 0 || sg[0].length == 0); | |
295 | ||
296 | for_each_sg(sg, s, nents, i) { | |
297 | s->dma_address = 0L; | |
298 | #ifdef CONFIG_NEED_SG_DMA_LENGTH | |
299 | s->dma_length = s->length; | |
300 | #endif | |
301 | } | |
302 | return nents; | |
303 | } | |
304 | ||
305 | static inline int | |
306 | fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, | |
307 | enum dma_data_direction dir) | |
308 | { | |
309 | return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); | |
310 | } | |
311 | ||
312 | static inline void | |
313 | fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, | |
314 | enum dma_data_direction dir) | |
315 | { | |
316 | if (dev) | |
317 | dma_unmap_sg(dev, sg, nents, dir); | |
318 | } | |
319 | ||
320 | ||
321 | /* *********************** FC-NVME Port Management ************************ */ | |
322 | ||
323 | ||
324 | static int | |
325 | nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport) | |
326 | { | |
327 | struct nvmet_fc_ls_iod *iod; | |
328 | int i; | |
329 | ||
330 | iod = kcalloc(NVMET_LS_CTX_COUNT, sizeof(struct nvmet_fc_ls_iod), | |
331 | GFP_KERNEL); | |
332 | if (!iod) | |
333 | return -ENOMEM; | |
334 | ||
335 | tgtport->iod = iod; | |
336 | ||
337 | for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { | |
338 | INIT_WORK(&iod->work, nvmet_fc_handle_ls_rqst_work); | |
339 | iod->tgtport = tgtport; | |
340 | list_add_tail(&iod->ls_list, &tgtport->ls_list); | |
341 | ||
342 | iod->rqstbuf = kcalloc(2, NVME_FC_MAX_LS_BUFFER_SIZE, | |
343 | GFP_KERNEL); | |
344 | if (!iod->rqstbuf) | |
345 | goto out_fail; | |
346 | ||
347 | iod->rspbuf = iod->rqstbuf + NVME_FC_MAX_LS_BUFFER_SIZE; | |
348 | ||
349 | iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf, | |
350 | NVME_FC_MAX_LS_BUFFER_SIZE, | |
351 | DMA_TO_DEVICE); | |
352 | if (fc_dma_mapping_error(tgtport->dev, iod->rspdma)) | |
353 | goto out_fail; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | ||
358 | out_fail: | |
359 | kfree(iod->rqstbuf); | |
360 | list_del(&iod->ls_list); | |
361 | for (iod--, i--; i >= 0; iod--, i--) { | |
362 | fc_dma_unmap_single(tgtport->dev, iod->rspdma, | |
363 | NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE); | |
364 | kfree(iod->rqstbuf); | |
365 | list_del(&iod->ls_list); | |
366 | } | |
367 | ||
368 | kfree(iod); | |
369 | ||
370 | return -EFAULT; | |
371 | } | |
372 | ||
373 | static void | |
374 | nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport) | |
375 | { | |
376 | struct nvmet_fc_ls_iod *iod = tgtport->iod; | |
377 | int i; | |
378 | ||
379 | for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { | |
380 | fc_dma_unmap_single(tgtport->dev, | |
381 | iod->rspdma, NVME_FC_MAX_LS_BUFFER_SIZE, | |
382 | DMA_TO_DEVICE); | |
383 | kfree(iod->rqstbuf); | |
384 | list_del(&iod->ls_list); | |
385 | } | |
386 | kfree(tgtport->iod); | |
387 | } | |
388 | ||
389 | static struct nvmet_fc_ls_iod * | |
390 | nvmet_fc_alloc_ls_iod(struct nvmet_fc_tgtport *tgtport) | |
391 | { | |
369157b4 | 392 | struct nvmet_fc_ls_iod *iod; |
c5343203 JS |
393 | unsigned long flags; |
394 | ||
395 | spin_lock_irqsave(&tgtport->lock, flags); | |
396 | iod = list_first_entry_or_null(&tgtport->ls_list, | |
397 | struct nvmet_fc_ls_iod, ls_list); | |
398 | if (iod) | |
399 | list_move_tail(&iod->ls_list, &tgtport->ls_busylist); | |
400 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
401 | return iod; | |
402 | } | |
403 | ||
404 | ||
405 | static void | |
406 | nvmet_fc_free_ls_iod(struct nvmet_fc_tgtport *tgtport, | |
407 | struct nvmet_fc_ls_iod *iod) | |
408 | { | |
409 | unsigned long flags; | |
410 | ||
411 | spin_lock_irqsave(&tgtport->lock, flags); | |
412 | list_move(&iod->ls_list, &tgtport->ls_list); | |
413 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
414 | } | |
415 | ||
416 | static void | |
417 | nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, | |
418 | struct nvmet_fc_tgt_queue *queue) | |
419 | { | |
420 | struct nvmet_fc_fcp_iod *fod = queue->fod; | |
421 | int i; | |
422 | ||
423 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
9d625f77 | 424 | INIT_WORK(&fod->defer_work, nvmet_fc_fcp_rqst_op_defer_work); |
c5343203 JS |
425 | fod->tgtport = tgtport; |
426 | fod->queue = queue; | |
427 | fod->active = false; | |
a97ec51b JS |
428 | fod->abort = false; |
429 | fod->aborted = false; | |
430 | fod->fcpreq = NULL; | |
c5343203 JS |
431 | list_add_tail(&fod->fcp_list, &queue->fod_list); |
432 | spin_lock_init(&fod->flock); | |
433 | ||
434 | fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf, | |
435 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
436 | if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) { | |
437 | list_del(&fod->fcp_list); | |
438 | for (fod--, i--; i >= 0; fod--, i--) { | |
439 | fc_dma_unmap_single(tgtport->dev, fod->rspdma, | |
440 | sizeof(fod->rspiubuf), | |
441 | DMA_TO_DEVICE); | |
442 | fod->rspdma = 0L; | |
443 | list_del(&fod->fcp_list); | |
444 | } | |
445 | ||
446 | return; | |
447 | } | |
448 | } | |
449 | } | |
450 | ||
451 | static void | |
452 | nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, | |
453 | struct nvmet_fc_tgt_queue *queue) | |
454 | { | |
455 | struct nvmet_fc_fcp_iod *fod = queue->fod; | |
456 | int i; | |
457 | ||
458 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
459 | if (fod->rspdma) | |
460 | fc_dma_unmap_single(tgtport->dev, fod->rspdma, | |
461 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
462 | } | |
463 | } | |
464 | ||
465 | static struct nvmet_fc_fcp_iod * | |
466 | nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue) | |
467 | { | |
369157b4 | 468 | struct nvmet_fc_fcp_iod *fod; |
c5343203 | 469 | |
0fb228d3 JS |
470 | lockdep_assert_held(&queue->qlock); |
471 | ||
c5343203 JS |
472 | fod = list_first_entry_or_null(&queue->fod_list, |
473 | struct nvmet_fc_fcp_iod, fcp_list); | |
474 | if (fod) { | |
475 | list_del(&fod->fcp_list); | |
476 | fod->active = true; | |
c5343203 JS |
477 | /* |
478 | * no queue reference is taken, as it was taken by the | |
479 | * queue lookup just prior to the allocation. The iod | |
480 | * will "inherit" that reference. | |
481 | */ | |
482 | } | |
c5343203 JS |
483 | return fod; |
484 | } | |
485 | ||
486 | ||
0fb228d3 JS |
487 | static void |
488 | nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport, | |
489 | struct nvmet_fc_tgt_queue *queue, | |
490 | struct nvmefc_tgt_fcp_req *fcpreq) | |
491 | { | |
492 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
493 | ||
494 | /* | |
495 | * put all admin cmds on hw queue id 0. All io commands go to | |
496 | * the respective hw queue based on a modulo basis | |
497 | */ | |
498 | fcpreq->hwqid = queue->qid ? | |
499 | ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0; | |
500 | ||
6e2e312e | 501 | nvmet_fc_handle_fcp_rqst(tgtport, fod); |
0fb228d3 JS |
502 | } |
503 | ||
9d625f77 JS |
504 | static void |
505 | nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work) | |
506 | { | |
507 | struct nvmet_fc_fcp_iod *fod = | |
508 | container_of(work, struct nvmet_fc_fcp_iod, defer_work); | |
509 | ||
510 | /* Submit deferred IO for processing */ | |
511 | nvmet_fc_queue_fcp_req(fod->tgtport, fod->queue, fod->fcpreq); | |
512 | ||
513 | } | |
514 | ||
c5343203 JS |
515 | static void |
516 | nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue, | |
517 | struct nvmet_fc_fcp_iod *fod) | |
518 | { | |
19b58d94 JS |
519 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; |
520 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
0fb228d3 | 521 | struct nvmet_fc_defer_fcp_req *deferfcp; |
c5343203 JS |
522 | unsigned long flags; |
523 | ||
a97ec51b JS |
524 | fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma, |
525 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
526 | ||
527 | fcpreq->nvmet_fc_private = NULL; | |
528 | ||
c5343203 | 529 | fod->active = false; |
a97ec51b JS |
530 | fod->abort = false; |
531 | fod->aborted = false; | |
532 | fod->writedataactive = false; | |
533 | fod->fcpreq = NULL; | |
0fb228d3 JS |
534 | |
535 | tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq); | |
536 | ||
619c62dc JS |
537 | /* release the queue lookup reference on the completed IO */ |
538 | nvmet_fc_tgt_q_put(queue); | |
539 | ||
0fb228d3 JS |
540 | spin_lock_irqsave(&queue->qlock, flags); |
541 | deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, | |
542 | struct nvmet_fc_defer_fcp_req, req_list); | |
543 | if (!deferfcp) { | |
544 | list_add_tail(&fod->fcp_list, &fod->queue->fod_list); | |
545 | spin_unlock_irqrestore(&queue->qlock, flags); | |
0fb228d3 JS |
546 | return; |
547 | } | |
548 | ||
549 | /* Re-use the fod for the next pending cmd that was deferred */ | |
550 | list_del(&deferfcp->req_list); | |
551 | ||
552 | fcpreq = deferfcp->fcp_req; | |
553 | ||
554 | /* deferfcp can be reused for another IO at a later date */ | |
555 | list_add_tail(&deferfcp->req_list, &queue->avail_defer_list); | |
556 | ||
c5343203 JS |
557 | spin_unlock_irqrestore(&queue->qlock, flags); |
558 | ||
0fb228d3 JS |
559 | /* Save NVME CMD IO in fod */ |
560 | memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen); | |
561 | ||
562 | /* Setup new fcpreq to be processed */ | |
563 | fcpreq->rspaddr = NULL; | |
564 | fcpreq->rsplen = 0; | |
565 | fcpreq->nvmet_fc_private = fod; | |
566 | fod->fcpreq = fcpreq; | |
567 | fod->active = true; | |
568 | ||
569 | /* inform LLDD IO is now being processed */ | |
570 | tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq); | |
571 | ||
c5343203 | 572 | /* |
0fb228d3 JS |
573 | * Leave the queue lookup get reference taken when |
574 | * fod was originally allocated. | |
c5343203 | 575 | */ |
9d625f77 JS |
576 | |
577 | queue_work(queue->work_q, &fod->defer_work); | |
c5343203 JS |
578 | } |
579 | ||
c5343203 JS |
580 | static struct nvmet_fc_tgt_queue * |
581 | nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc, | |
582 | u16 qid, u16 sqsize) | |
583 | { | |
584 | struct nvmet_fc_tgt_queue *queue; | |
585 | unsigned long flags; | |
586 | int ret; | |
587 | ||
deb61742 | 588 | if (qid > NVMET_NR_QUEUES) |
c5343203 JS |
589 | return NULL; |
590 | ||
591 | queue = kzalloc((sizeof(*queue) + | |
592 | (sizeof(struct nvmet_fc_fcp_iod) * sqsize)), | |
593 | GFP_KERNEL); | |
594 | if (!queue) | |
595 | return NULL; | |
596 | ||
597 | if (!nvmet_fc_tgt_a_get(assoc)) | |
598 | goto out_free_queue; | |
599 | ||
600 | queue->work_q = alloc_workqueue("ntfc%d.%d.%d", 0, 0, | |
601 | assoc->tgtport->fc_target_port.port_num, | |
602 | assoc->a_id, qid); | |
603 | if (!queue->work_q) | |
604 | goto out_a_put; | |
605 | ||
606 | queue->fod = (struct nvmet_fc_fcp_iod *)&queue[1]; | |
607 | queue->qid = qid; | |
608 | queue->sqsize = sqsize; | |
609 | queue->assoc = assoc; | |
c5343203 | 610 | INIT_LIST_HEAD(&queue->fod_list); |
0fb228d3 JS |
611 | INIT_LIST_HEAD(&queue->avail_defer_list); |
612 | INIT_LIST_HEAD(&queue->pending_cmd_list); | |
c5343203 JS |
613 | atomic_set(&queue->connected, 0); |
614 | atomic_set(&queue->sqtail, 0); | |
615 | atomic_set(&queue->rsn, 1); | |
616 | atomic_set(&queue->zrspcnt, 0); | |
617 | spin_lock_init(&queue->qlock); | |
618 | kref_init(&queue->ref); | |
619 | ||
620 | nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue); | |
621 | ||
622 | ret = nvmet_sq_init(&queue->nvme_sq); | |
623 | if (ret) | |
624 | goto out_fail_iodlist; | |
625 | ||
626 | WARN_ON(assoc->queues[qid]); | |
627 | spin_lock_irqsave(&assoc->tgtport->lock, flags); | |
628 | assoc->queues[qid] = queue; | |
629 | spin_unlock_irqrestore(&assoc->tgtport->lock, flags); | |
630 | ||
631 | return queue; | |
632 | ||
633 | out_fail_iodlist: | |
634 | nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue); | |
635 | destroy_workqueue(queue->work_q); | |
636 | out_a_put: | |
637 | nvmet_fc_tgt_a_put(assoc); | |
638 | out_free_queue: | |
639 | kfree(queue); | |
640 | return NULL; | |
641 | } | |
642 | ||
643 | ||
644 | static void | |
645 | nvmet_fc_tgt_queue_free(struct kref *ref) | |
646 | { | |
647 | struct nvmet_fc_tgt_queue *queue = | |
648 | container_of(ref, struct nvmet_fc_tgt_queue, ref); | |
649 | unsigned long flags; | |
650 | ||
651 | spin_lock_irqsave(&queue->assoc->tgtport->lock, flags); | |
652 | queue->assoc->queues[queue->qid] = NULL; | |
653 | spin_unlock_irqrestore(&queue->assoc->tgtport->lock, flags); | |
654 | ||
655 | nvmet_fc_destroy_fcp_iodlist(queue->assoc->tgtport, queue); | |
656 | ||
657 | nvmet_fc_tgt_a_put(queue->assoc); | |
658 | ||
659 | destroy_workqueue(queue->work_q); | |
660 | ||
661 | kfree(queue); | |
662 | } | |
663 | ||
664 | static void | |
665 | nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue) | |
666 | { | |
667 | kref_put(&queue->ref, nvmet_fc_tgt_queue_free); | |
668 | } | |
669 | ||
670 | static int | |
671 | nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue) | |
672 | { | |
673 | return kref_get_unless_zero(&queue->ref); | |
674 | } | |
675 | ||
676 | ||
c5343203 JS |
677 | static void |
678 | nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue) | |
679 | { | |
a97ec51b | 680 | struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport; |
c5343203 | 681 | struct nvmet_fc_fcp_iod *fod = queue->fod; |
16a5a480 | 682 | struct nvmet_fc_defer_fcp_req *deferfcp, *tempptr; |
c5343203 | 683 | unsigned long flags; |
a97ec51b | 684 | int i, writedataactive; |
c5343203 JS |
685 | bool disconnect; |
686 | ||
687 | disconnect = atomic_xchg(&queue->connected, 0); | |
688 | ||
689 | spin_lock_irqsave(&queue->qlock, flags); | |
690 | /* about outstanding io's */ | |
691 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
692 | if (fod->active) { | |
693 | spin_lock(&fod->flock); | |
694 | fod->abort = true; | |
a97ec51b | 695 | writedataactive = fod->writedataactive; |
c5343203 | 696 | spin_unlock(&fod->flock); |
a97ec51b JS |
697 | /* |
698 | * only call lldd abort routine if waiting for | |
699 | * writedata. other outstanding ops should finish | |
700 | * on their own. | |
701 | */ | |
702 | if (writedataactive) { | |
703 | spin_lock(&fod->flock); | |
704 | fod->aborted = true; | |
705 | spin_unlock(&fod->flock); | |
706 | tgtport->ops->fcp_abort( | |
707 | &tgtport->fc_target_port, fod->fcpreq); | |
708 | } | |
c5343203 JS |
709 | } |
710 | } | |
0fb228d3 JS |
711 | |
712 | /* Cleanup defer'ed IOs in queue */ | |
16a5a480 JS |
713 | list_for_each_entry_safe(deferfcp, tempptr, &queue->avail_defer_list, |
714 | req_list) { | |
0fb228d3 JS |
715 | list_del(&deferfcp->req_list); |
716 | kfree(deferfcp); | |
717 | } | |
718 | ||
719 | for (;;) { | |
720 | deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, | |
721 | struct nvmet_fc_defer_fcp_req, req_list); | |
722 | if (!deferfcp) | |
723 | break; | |
724 | ||
725 | list_del(&deferfcp->req_list); | |
726 | spin_unlock_irqrestore(&queue->qlock, flags); | |
727 | ||
728 | tgtport->ops->defer_rcv(&tgtport->fc_target_port, | |
729 | deferfcp->fcp_req); | |
730 | ||
731 | tgtport->ops->fcp_abort(&tgtport->fc_target_port, | |
732 | deferfcp->fcp_req); | |
733 | ||
734 | tgtport->ops->fcp_req_release(&tgtport->fc_target_port, | |
735 | deferfcp->fcp_req); | |
736 | ||
619c62dc JS |
737 | /* release the queue lookup reference */ |
738 | nvmet_fc_tgt_q_put(queue); | |
739 | ||
0fb228d3 JS |
740 | kfree(deferfcp); |
741 | ||
742 | spin_lock_irqsave(&queue->qlock, flags); | |
743 | } | |
c5343203 JS |
744 | spin_unlock_irqrestore(&queue->qlock, flags); |
745 | ||
746 | flush_workqueue(queue->work_q); | |
747 | ||
748 | if (disconnect) | |
749 | nvmet_sq_destroy(&queue->nvme_sq); | |
750 | ||
751 | nvmet_fc_tgt_q_put(queue); | |
752 | } | |
753 | ||
754 | static struct nvmet_fc_tgt_queue * | |
755 | nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport, | |
756 | u64 connection_id) | |
757 | { | |
758 | struct nvmet_fc_tgt_assoc *assoc; | |
759 | struct nvmet_fc_tgt_queue *queue; | |
760 | u64 association_id = nvmet_fc_getassociationid(connection_id); | |
761 | u16 qid = nvmet_fc_getqueueid(connection_id); | |
762 | unsigned long flags; | |
763 | ||
0c319d3a JS |
764 | if (qid > NVMET_NR_QUEUES) |
765 | return NULL; | |
766 | ||
c5343203 JS |
767 | spin_lock_irqsave(&tgtport->lock, flags); |
768 | list_for_each_entry(assoc, &tgtport->assoc_list, a_list) { | |
769 | if (association_id == assoc->association_id) { | |
770 | queue = assoc->queues[qid]; | |
771 | if (queue && | |
772 | (!atomic_read(&queue->connected) || | |
773 | !nvmet_fc_tgt_q_get(queue))) | |
774 | queue = NULL; | |
775 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
776 | return queue; | |
777 | } | |
778 | } | |
779 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
780 | return NULL; | |
781 | } | |
782 | ||
a96d4bd8 JS |
783 | static void |
784 | nvmet_fc_delete_assoc(struct work_struct *work) | |
785 | { | |
786 | struct nvmet_fc_tgt_assoc *assoc = | |
787 | container_of(work, struct nvmet_fc_tgt_assoc, del_work); | |
788 | ||
789 | nvmet_fc_delete_target_assoc(assoc); | |
790 | nvmet_fc_tgt_a_put(assoc); | |
791 | } | |
792 | ||
c5343203 JS |
793 | static struct nvmet_fc_tgt_assoc * |
794 | nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport) | |
795 | { | |
796 | struct nvmet_fc_tgt_assoc *assoc, *tmpassoc; | |
797 | unsigned long flags; | |
798 | u64 ran; | |
799 | int idx; | |
800 | bool needrandom = true; | |
801 | ||
802 | assoc = kzalloc(sizeof(*assoc), GFP_KERNEL); | |
803 | if (!assoc) | |
804 | return NULL; | |
805 | ||
806 | idx = ida_simple_get(&tgtport->assoc_cnt, 0, 0, GFP_KERNEL); | |
807 | if (idx < 0) | |
808 | goto out_free_assoc; | |
809 | ||
810 | if (!nvmet_fc_tgtport_get(tgtport)) | |
811 | goto out_ida_put; | |
812 | ||
813 | assoc->tgtport = tgtport; | |
814 | assoc->a_id = idx; | |
815 | INIT_LIST_HEAD(&assoc->a_list); | |
816 | kref_init(&assoc->ref); | |
a96d4bd8 | 817 | INIT_WORK(&assoc->del_work, nvmet_fc_delete_assoc); |
c5343203 JS |
818 | |
819 | while (needrandom) { | |
820 | get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID); | |
821 | ran = ran << BYTES_FOR_QID_SHIFT; | |
822 | ||
823 | spin_lock_irqsave(&tgtport->lock, flags); | |
824 | needrandom = false; | |
825 | list_for_each_entry(tmpassoc, &tgtport->assoc_list, a_list) | |
826 | if (ran == tmpassoc->association_id) { | |
827 | needrandom = true; | |
828 | break; | |
829 | } | |
830 | if (!needrandom) { | |
831 | assoc->association_id = ran; | |
832 | list_add_tail(&assoc->a_list, &tgtport->assoc_list); | |
833 | } | |
834 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
835 | } | |
836 | ||
837 | return assoc; | |
838 | ||
839 | out_ida_put: | |
840 | ida_simple_remove(&tgtport->assoc_cnt, idx); | |
841 | out_free_assoc: | |
842 | kfree(assoc); | |
843 | return NULL; | |
844 | } | |
845 | ||
846 | static void | |
847 | nvmet_fc_target_assoc_free(struct kref *ref) | |
848 | { | |
849 | struct nvmet_fc_tgt_assoc *assoc = | |
850 | container_of(ref, struct nvmet_fc_tgt_assoc, ref); | |
851 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
852 | unsigned long flags; | |
853 | ||
854 | spin_lock_irqsave(&tgtport->lock, flags); | |
855 | list_del(&assoc->a_list); | |
856 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
857 | ida_simple_remove(&tgtport->assoc_cnt, assoc->a_id); | |
858 | kfree(assoc); | |
859 | nvmet_fc_tgtport_put(tgtport); | |
860 | } | |
861 | ||
862 | static void | |
863 | nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc) | |
864 | { | |
865 | kref_put(&assoc->ref, nvmet_fc_target_assoc_free); | |
866 | } | |
867 | ||
868 | static int | |
869 | nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc) | |
870 | { | |
871 | return kref_get_unless_zero(&assoc->ref); | |
872 | } | |
873 | ||
874 | static void | |
875 | nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc) | |
876 | { | |
877 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
878 | struct nvmet_fc_tgt_queue *queue; | |
879 | unsigned long flags; | |
880 | int i; | |
881 | ||
882 | spin_lock_irqsave(&tgtport->lock, flags); | |
deb61742 | 883 | for (i = NVMET_NR_QUEUES; i >= 0; i--) { |
c5343203 JS |
884 | queue = assoc->queues[i]; |
885 | if (queue) { | |
886 | if (!nvmet_fc_tgt_q_get(queue)) | |
887 | continue; | |
888 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
889 | nvmet_fc_delete_target_queue(queue); | |
890 | nvmet_fc_tgt_q_put(queue); | |
891 | spin_lock_irqsave(&tgtport->lock, flags); | |
892 | } | |
893 | } | |
894 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
895 | ||
896 | nvmet_fc_tgt_a_put(assoc); | |
897 | } | |
898 | ||
899 | static struct nvmet_fc_tgt_assoc * | |
900 | nvmet_fc_find_target_assoc(struct nvmet_fc_tgtport *tgtport, | |
901 | u64 association_id) | |
902 | { | |
903 | struct nvmet_fc_tgt_assoc *assoc; | |
904 | struct nvmet_fc_tgt_assoc *ret = NULL; | |
905 | unsigned long flags; | |
906 | ||
907 | spin_lock_irqsave(&tgtport->lock, flags); | |
908 | list_for_each_entry(assoc, &tgtport->assoc_list, a_list) { | |
909 | if (association_id == assoc->association_id) { | |
910 | ret = assoc; | |
911 | nvmet_fc_tgt_a_get(assoc); | |
912 | break; | |
913 | } | |
914 | } | |
915 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
916 | ||
917 | return ret; | |
918 | } | |
919 | ||
ea96d649 JS |
920 | static void |
921 | nvmet_fc_portentry_bind(struct nvmet_fc_tgtport *tgtport, | |
922 | struct nvmet_fc_port_entry *pe, | |
923 | struct nvmet_port *port) | |
924 | { | |
925 | lockdep_assert_held(&nvmet_fc_tgtlock); | |
926 | ||
927 | pe->tgtport = tgtport; | |
928 | tgtport->pe = pe; | |
929 | ||
930 | pe->port = port; | |
931 | port->priv = pe; | |
932 | ||
933 | pe->node_name = tgtport->fc_target_port.node_name; | |
934 | pe->port_name = tgtport->fc_target_port.port_name; | |
935 | INIT_LIST_HEAD(&pe->pe_list); | |
936 | ||
937 | list_add_tail(&pe->pe_list, &nvmet_fc_portentry_list); | |
938 | } | |
939 | ||
940 | static void | |
941 | nvmet_fc_portentry_unbind(struct nvmet_fc_port_entry *pe) | |
942 | { | |
943 | unsigned long flags; | |
944 | ||
945 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
946 | if (pe->tgtport) | |
947 | pe->tgtport->pe = NULL; | |
948 | list_del(&pe->pe_list); | |
949 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
950 | } | |
951 | ||
952 | /* | |
953 | * called when a targetport deregisters. Breaks the relationship | |
954 | * with the nvmet port, but leaves the port_entry in place so that | |
955 | * re-registration can resume operation. | |
956 | */ | |
957 | static void | |
958 | nvmet_fc_portentry_unbind_tgt(struct nvmet_fc_tgtport *tgtport) | |
959 | { | |
960 | struct nvmet_fc_port_entry *pe; | |
961 | unsigned long flags; | |
962 | ||
963 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
964 | pe = tgtport->pe; | |
965 | if (pe) | |
966 | pe->tgtport = NULL; | |
967 | tgtport->pe = NULL; | |
968 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
969 | } | |
970 | ||
971 | /* | |
972 | * called when a new targetport is registered. Looks in the | |
973 | * existing nvmet port_entries to see if the nvmet layer is | |
974 | * configured for the targetport's wwn's. (the targetport existed, | |
975 | * nvmet configured, the lldd unregistered the tgtport, and is now | |
976 | * reregistering the same targetport). If so, set the nvmet port | |
977 | * port entry on the targetport. | |
978 | */ | |
979 | static void | |
980 | nvmet_fc_portentry_rebind_tgt(struct nvmet_fc_tgtport *tgtport) | |
981 | { | |
982 | struct nvmet_fc_port_entry *pe; | |
983 | unsigned long flags; | |
984 | ||
985 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
986 | list_for_each_entry(pe, &nvmet_fc_portentry_list, pe_list) { | |
987 | if (tgtport->fc_target_port.node_name == pe->node_name && | |
988 | tgtport->fc_target_port.port_name == pe->port_name) { | |
989 | WARN_ON(pe->tgtport); | |
990 | tgtport->pe = pe; | |
991 | pe->tgtport = tgtport; | |
992 | break; | |
993 | } | |
994 | } | |
995 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
996 | } | |
c5343203 JS |
997 | |
998 | /** | |
999 | * nvme_fc_register_targetport - transport entry point called by an | |
1000 | * LLDD to register the existence of a local | |
1001 | * NVME subystem FC port. | |
1002 | * @pinfo: pointer to information about the port to be registered | |
1003 | * @template: LLDD entrypoints and operational parameters for the port | |
1004 | * @dev: physical hardware device node port corresponds to. Will be | |
1005 | * used for DMA mappings | |
1006 | * @portptr: pointer to a local port pointer. Upon success, the routine | |
1007 | * will allocate a nvme_fc_local_port structure and place its | |
1008 | * address in the local port pointer. Upon failure, local port | |
1009 | * pointer will be set to NULL. | |
1010 | * | |
1011 | * Returns: | |
1012 | * a completion status. Must be 0 upon success; a negative errno | |
1013 | * (ex: -ENXIO) upon failure. | |
1014 | */ | |
1015 | int | |
1016 | nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, | |
1017 | struct nvmet_fc_target_template *template, | |
1018 | struct device *dev, | |
1019 | struct nvmet_fc_target_port **portptr) | |
1020 | { | |
1021 | struct nvmet_fc_tgtport *newrec; | |
1022 | unsigned long flags; | |
1023 | int ret, idx; | |
1024 | ||
1025 | if (!template->xmt_ls_rsp || !template->fcp_op || | |
a97ec51b | 1026 | !template->fcp_abort || |
19b58d94 | 1027 | !template->fcp_req_release || !template->targetport_delete || |
c5343203 JS |
1028 | !template->max_hw_queues || !template->max_sgl_segments || |
1029 | !template->max_dif_sgl_segments || !template->dma_boundary) { | |
1030 | ret = -EINVAL; | |
1031 | goto out_regtgt_failed; | |
1032 | } | |
1033 | ||
1034 | newrec = kzalloc((sizeof(*newrec) + template->target_priv_sz), | |
1035 | GFP_KERNEL); | |
1036 | if (!newrec) { | |
1037 | ret = -ENOMEM; | |
1038 | goto out_regtgt_failed; | |
1039 | } | |
1040 | ||
1041 | idx = ida_simple_get(&nvmet_fc_tgtport_cnt, 0, 0, GFP_KERNEL); | |
1042 | if (idx < 0) { | |
1043 | ret = -ENOSPC; | |
1044 | goto out_fail_kfree; | |
1045 | } | |
1046 | ||
1047 | if (!get_device(dev) && dev) { | |
1048 | ret = -ENODEV; | |
1049 | goto out_ida_put; | |
1050 | } | |
1051 | ||
1052 | newrec->fc_target_port.node_name = pinfo->node_name; | |
1053 | newrec->fc_target_port.port_name = pinfo->port_name; | |
1054 | newrec->fc_target_port.private = &newrec[1]; | |
1055 | newrec->fc_target_port.port_id = pinfo->port_id; | |
1056 | newrec->fc_target_port.port_num = idx; | |
1057 | INIT_LIST_HEAD(&newrec->tgt_list); | |
1058 | newrec->dev = dev; | |
1059 | newrec->ops = template; | |
1060 | spin_lock_init(&newrec->lock); | |
1061 | INIT_LIST_HEAD(&newrec->ls_list); | |
1062 | INIT_LIST_HEAD(&newrec->ls_busylist); | |
1063 | INIT_LIST_HEAD(&newrec->assoc_list); | |
1064 | kref_init(&newrec->ref); | |
1065 | ida_init(&newrec->assoc_cnt); | |
d082dc15 | 1066 | newrec->max_sg_cnt = template->max_sgl_segments; |
c5343203 JS |
1067 | |
1068 | ret = nvmet_fc_alloc_ls_iodlist(newrec); | |
1069 | if (ret) { | |
1070 | ret = -ENOMEM; | |
1071 | goto out_free_newrec; | |
1072 | } | |
1073 | ||
ea96d649 JS |
1074 | nvmet_fc_portentry_rebind_tgt(newrec); |
1075 | ||
c5343203 JS |
1076 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); |
1077 | list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list); | |
1078 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1079 | ||
1080 | *portptr = &newrec->fc_target_port; | |
1081 | return 0; | |
1082 | ||
1083 | out_free_newrec: | |
1084 | put_device(dev); | |
1085 | out_ida_put: | |
1086 | ida_simple_remove(&nvmet_fc_tgtport_cnt, idx); | |
1087 | out_fail_kfree: | |
1088 | kfree(newrec); | |
1089 | out_regtgt_failed: | |
1090 | *portptr = NULL; | |
1091 | return ret; | |
1092 | } | |
1093 | EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport); | |
1094 | ||
1095 | ||
1096 | static void | |
1097 | nvmet_fc_free_tgtport(struct kref *ref) | |
1098 | { | |
1099 | struct nvmet_fc_tgtport *tgtport = | |
1100 | container_of(ref, struct nvmet_fc_tgtport, ref); | |
1101 | struct device *dev = tgtport->dev; | |
1102 | unsigned long flags; | |
1103 | ||
1104 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1105 | list_del(&tgtport->tgt_list); | |
1106 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1107 | ||
1108 | nvmet_fc_free_ls_iodlist(tgtport); | |
1109 | ||
1110 | /* let the LLDD know we've finished tearing it down */ | |
1111 | tgtport->ops->targetport_delete(&tgtport->fc_target_port); | |
1112 | ||
1113 | ida_simple_remove(&nvmet_fc_tgtport_cnt, | |
1114 | tgtport->fc_target_port.port_num); | |
1115 | ||
1116 | ida_destroy(&tgtport->assoc_cnt); | |
1117 | ||
1118 | kfree(tgtport); | |
1119 | ||
1120 | put_device(dev); | |
1121 | } | |
1122 | ||
1123 | static void | |
1124 | nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport) | |
1125 | { | |
1126 | kref_put(&tgtport->ref, nvmet_fc_free_tgtport); | |
1127 | } | |
1128 | ||
1129 | static int | |
1130 | nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport) | |
1131 | { | |
1132 | return kref_get_unless_zero(&tgtport->ref); | |
1133 | } | |
1134 | ||
1135 | static void | |
1136 | __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport) | |
1137 | { | |
1138 | struct nvmet_fc_tgt_assoc *assoc, *next; | |
1139 | unsigned long flags; | |
1140 | ||
1141 | spin_lock_irqsave(&tgtport->lock, flags); | |
1142 | list_for_each_entry_safe(assoc, next, | |
1143 | &tgtport->assoc_list, a_list) { | |
1144 | if (!nvmet_fc_tgt_a_get(assoc)) | |
1145 | continue; | |
0191e740 JS |
1146 | if (!schedule_work(&assoc->del_work)) |
1147 | nvmet_fc_tgt_a_put(assoc); | |
c5343203 JS |
1148 | } |
1149 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * nvmet layer has called to terminate an association | |
1154 | */ | |
1155 | static void | |
1156 | nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl) | |
1157 | { | |
1158 | struct nvmet_fc_tgtport *tgtport, *next; | |
1159 | struct nvmet_fc_tgt_assoc *assoc; | |
1160 | struct nvmet_fc_tgt_queue *queue; | |
1161 | unsigned long flags; | |
1162 | bool found_ctrl = false; | |
1163 | ||
1164 | /* this is a bit ugly, but don't want to make locks layered */ | |
1165 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1166 | list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list, | |
1167 | tgt_list) { | |
1168 | if (!nvmet_fc_tgtport_get(tgtport)) | |
1169 | continue; | |
1170 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1171 | ||
1172 | spin_lock_irqsave(&tgtport->lock, flags); | |
1173 | list_for_each_entry(assoc, &tgtport->assoc_list, a_list) { | |
1174 | queue = assoc->queues[0]; | |
1175 | if (queue && queue->nvme_sq.ctrl == ctrl) { | |
1176 | if (nvmet_fc_tgt_a_get(assoc)) | |
1177 | found_ctrl = true; | |
1178 | break; | |
1179 | } | |
1180 | } | |
1181 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1182 | ||
1183 | nvmet_fc_tgtport_put(tgtport); | |
1184 | ||
1185 | if (found_ctrl) { | |
0191e740 JS |
1186 | if (!schedule_work(&assoc->del_work)) |
1187 | nvmet_fc_tgt_a_put(assoc); | |
c5343203 JS |
1188 | return; |
1189 | } | |
1190 | ||
1191 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1192 | } | |
1193 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1194 | } | |
1195 | ||
1196 | /** | |
1197 | * nvme_fc_unregister_targetport - transport entry point called by an | |
1198 | * LLDD to deregister/remove a previously | |
1199 | * registered a local NVME subsystem FC port. | |
1c466527 BVA |
1200 | * @target_port: pointer to the (registered) target port that is to be |
1201 | * deregistered. | |
c5343203 JS |
1202 | * |
1203 | * Returns: | |
1204 | * a completion status. Must be 0 upon success; a negative errno | |
1205 | * (ex: -ENXIO) upon failure. | |
1206 | */ | |
1207 | int | |
1208 | nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port) | |
1209 | { | |
1210 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
1211 | ||
ea96d649 JS |
1212 | nvmet_fc_portentry_unbind_tgt(tgtport); |
1213 | ||
c5343203 JS |
1214 | /* terminate any outstanding associations */ |
1215 | __nvmet_fc_free_assocs(tgtport); | |
1216 | ||
1217 | nvmet_fc_tgtport_put(tgtport); | |
1218 | ||
1219 | return 0; | |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport); | |
1222 | ||
1223 | ||
1224 | /* *********************** FC-NVME LS Handling **************************** */ | |
1225 | ||
1226 | ||
1227 | static void | |
3f5e1188 | 1228 | nvmet_fc_format_rsp_hdr(void *buf, u8 ls_cmd, __be32 desc_len, u8 rqst_ls_cmd) |
c5343203 JS |
1229 | { |
1230 | struct fcnvme_ls_acc_hdr *acc = buf; | |
1231 | ||
1232 | acc->w0.ls_cmd = ls_cmd; | |
1233 | acc->desc_list_len = desc_len; | |
1234 | acc->rqst.desc_tag = cpu_to_be32(FCNVME_LSDESC_RQST); | |
1235 | acc->rqst.desc_len = | |
1236 | fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst)); | |
1237 | acc->rqst.w0.ls_cmd = rqst_ls_cmd; | |
1238 | } | |
1239 | ||
1240 | static int | |
1241 | nvmet_fc_format_rjt(void *buf, u16 buflen, u8 ls_cmd, | |
1242 | u8 reason, u8 explanation, u8 vendor) | |
1243 | { | |
1244 | struct fcnvme_ls_rjt *rjt = buf; | |
1245 | ||
1246 | nvmet_fc_format_rsp_hdr(buf, FCNVME_LSDESC_RQST, | |
1247 | fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_rjt)), | |
1248 | ls_cmd); | |
1249 | rjt->rjt.desc_tag = cpu_to_be32(FCNVME_LSDESC_RJT); | |
1250 | rjt->rjt.desc_len = fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rjt)); | |
1251 | rjt->rjt.reason_code = reason; | |
1252 | rjt->rjt.reason_explanation = explanation; | |
1253 | rjt->rjt.vendor = vendor; | |
1254 | ||
1255 | return sizeof(struct fcnvme_ls_rjt); | |
1256 | } | |
1257 | ||
1258 | /* Validation Error indexes into the string table below */ | |
1259 | enum { | |
1260 | VERR_NO_ERROR = 0, | |
1261 | VERR_CR_ASSOC_LEN = 1, | |
1262 | VERR_CR_ASSOC_RQST_LEN = 2, | |
1263 | VERR_CR_ASSOC_CMD = 3, | |
1264 | VERR_CR_ASSOC_CMD_LEN = 4, | |
1265 | VERR_ERSP_RATIO = 5, | |
1266 | VERR_ASSOC_ALLOC_FAIL = 6, | |
1267 | VERR_QUEUE_ALLOC_FAIL = 7, | |
1268 | VERR_CR_CONN_LEN = 8, | |
1269 | VERR_CR_CONN_RQST_LEN = 9, | |
1270 | VERR_ASSOC_ID = 10, | |
1271 | VERR_ASSOC_ID_LEN = 11, | |
1272 | VERR_NO_ASSOC = 12, | |
1273 | VERR_CONN_ID = 13, | |
1274 | VERR_CONN_ID_LEN = 14, | |
1275 | VERR_NO_CONN = 15, | |
1276 | VERR_CR_CONN_CMD = 16, | |
1277 | VERR_CR_CONN_CMD_LEN = 17, | |
1278 | VERR_DISCONN_LEN = 18, | |
1279 | VERR_DISCONN_RQST_LEN = 19, | |
1280 | VERR_DISCONN_CMD = 20, | |
1281 | VERR_DISCONN_CMD_LEN = 21, | |
1282 | VERR_DISCONN_SCOPE = 22, | |
1283 | VERR_RS_LEN = 23, | |
1284 | VERR_RS_RQST_LEN = 24, | |
1285 | VERR_RS_CMD = 25, | |
1286 | VERR_RS_CMD_LEN = 26, | |
1287 | VERR_RS_RCTL = 27, | |
1288 | VERR_RS_RO = 28, | |
1289 | }; | |
1290 | ||
1291 | static char *validation_errors[] = { | |
1292 | "OK", | |
1293 | "Bad CR_ASSOC Length", | |
1294 | "Bad CR_ASSOC Rqst Length", | |
1295 | "Not CR_ASSOC Cmd", | |
1296 | "Bad CR_ASSOC Cmd Length", | |
1297 | "Bad Ersp Ratio", | |
1298 | "Association Allocation Failed", | |
1299 | "Queue Allocation Failed", | |
1300 | "Bad CR_CONN Length", | |
1301 | "Bad CR_CONN Rqst Length", | |
1302 | "Not Association ID", | |
1303 | "Bad Association ID Length", | |
1304 | "No Association", | |
1305 | "Not Connection ID", | |
1306 | "Bad Connection ID Length", | |
1307 | "No Connection", | |
1308 | "Not CR_CONN Cmd", | |
1309 | "Bad CR_CONN Cmd Length", | |
1310 | "Bad DISCONN Length", | |
1311 | "Bad DISCONN Rqst Length", | |
1312 | "Not DISCONN Cmd", | |
1313 | "Bad DISCONN Cmd Length", | |
1314 | "Bad Disconnect Scope", | |
1315 | "Bad RS Length", | |
1316 | "Bad RS Rqst Length", | |
1317 | "Not RS Cmd", | |
1318 | "Bad RS Cmd Length", | |
1319 | "Bad RS R_CTL", | |
1320 | "Bad RS Relative Offset", | |
1321 | }; | |
1322 | ||
1323 | static void | |
1324 | nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport, | |
1325 | struct nvmet_fc_ls_iod *iod) | |
1326 | { | |
1327 | struct fcnvme_ls_cr_assoc_rqst *rqst = | |
1328 | (struct fcnvme_ls_cr_assoc_rqst *)iod->rqstbuf; | |
1329 | struct fcnvme_ls_cr_assoc_acc *acc = | |
1330 | (struct fcnvme_ls_cr_assoc_acc *)iod->rspbuf; | |
1331 | struct nvmet_fc_tgt_queue *queue; | |
1332 | int ret = 0; | |
1333 | ||
1334 | memset(acc, 0, sizeof(*acc)); | |
1335 | ||
4cb7ca80 JS |
1336 | /* |
1337 | * FC-NVME spec changes. There are initiators sending different | |
1338 | * lengths as padding sizes for Create Association Cmd descriptor | |
1339 | * was incorrect. | |
1340 | * Accept anything of "minimum" length. Assume format per 1.15 | |
1341 | * spec (with HOSTID reduced to 16 bytes), ignore how long the | |
1342 | * trailing pad length is. | |
1343 | */ | |
1344 | if (iod->rqstdatalen < FCNVME_LSDESC_CRA_RQST_MINLEN) | |
c5343203 | 1345 | ret = VERR_CR_ASSOC_LEN; |
7722ecdc CH |
1346 | else if (be32_to_cpu(rqst->desc_list_len) < |
1347 | FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN) | |
c5343203 JS |
1348 | ret = VERR_CR_ASSOC_RQST_LEN; |
1349 | else if (rqst->assoc_cmd.desc_tag != | |
1350 | cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD)) | |
1351 | ret = VERR_CR_ASSOC_CMD; | |
7722ecdc CH |
1352 | else if (be32_to_cpu(rqst->assoc_cmd.desc_len) < |
1353 | FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN) | |
c5343203 JS |
1354 | ret = VERR_CR_ASSOC_CMD_LEN; |
1355 | else if (!rqst->assoc_cmd.ersp_ratio || | |
1356 | (be16_to_cpu(rqst->assoc_cmd.ersp_ratio) >= | |
1357 | be16_to_cpu(rqst->assoc_cmd.sqsize))) | |
1358 | ret = VERR_ERSP_RATIO; | |
1359 | ||
1360 | else { | |
1361 | /* new association w/ admin queue */ | |
1362 | iod->assoc = nvmet_fc_alloc_target_assoc(tgtport); | |
1363 | if (!iod->assoc) | |
1364 | ret = VERR_ASSOC_ALLOC_FAIL; | |
1365 | else { | |
1366 | queue = nvmet_fc_alloc_target_queue(iod->assoc, 0, | |
1367 | be16_to_cpu(rqst->assoc_cmd.sqsize)); | |
1368 | if (!queue) | |
1369 | ret = VERR_QUEUE_ALLOC_FAIL; | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | if (ret) { | |
1374 | dev_err(tgtport->dev, | |
1375 | "Create Association LS failed: %s\n", | |
1376 | validation_errors[ret]); | |
1377 | iod->lsreq->rsplen = nvmet_fc_format_rjt(acc, | |
1378 | NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd, | |
4083aa98 JS |
1379 | FCNVME_RJT_RC_LOGIC, |
1380 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1381 | return; |
1382 | } | |
1383 | ||
1384 | queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio); | |
1385 | atomic_set(&queue->connected, 1); | |
1386 | queue->sqhd = 0; /* best place to init value */ | |
1387 | ||
1388 | /* format a response */ | |
1389 | ||
1390 | iod->lsreq->rsplen = sizeof(*acc); | |
1391 | ||
1392 | nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, | |
1393 | fcnvme_lsdesc_len( | |
1394 | sizeof(struct fcnvme_ls_cr_assoc_acc)), | |
1395 | FCNVME_LS_CREATE_ASSOCIATION); | |
1396 | acc->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); | |
1397 | acc->associd.desc_len = | |
1398 | fcnvme_lsdesc_len( | |
1399 | sizeof(struct fcnvme_lsdesc_assoc_id)); | |
1400 | acc->associd.association_id = | |
1401 | cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, 0)); | |
1402 | acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); | |
1403 | acc->connectid.desc_len = | |
1404 | fcnvme_lsdesc_len( | |
1405 | sizeof(struct fcnvme_lsdesc_conn_id)); | |
1406 | acc->connectid.connection_id = acc->associd.association_id; | |
1407 | } | |
1408 | ||
1409 | static void | |
1410 | nvmet_fc_ls_create_connection(struct nvmet_fc_tgtport *tgtport, | |
1411 | struct nvmet_fc_ls_iod *iod) | |
1412 | { | |
1413 | struct fcnvme_ls_cr_conn_rqst *rqst = | |
1414 | (struct fcnvme_ls_cr_conn_rqst *)iod->rqstbuf; | |
1415 | struct fcnvme_ls_cr_conn_acc *acc = | |
1416 | (struct fcnvme_ls_cr_conn_acc *)iod->rspbuf; | |
1417 | struct nvmet_fc_tgt_queue *queue; | |
1418 | int ret = 0; | |
1419 | ||
1420 | memset(acc, 0, sizeof(*acc)); | |
1421 | ||
1422 | if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_conn_rqst)) | |
1423 | ret = VERR_CR_CONN_LEN; | |
1424 | else if (rqst->desc_list_len != | |
1425 | fcnvme_lsdesc_len( | |
1426 | sizeof(struct fcnvme_ls_cr_conn_rqst))) | |
1427 | ret = VERR_CR_CONN_RQST_LEN; | |
1428 | else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) | |
1429 | ret = VERR_ASSOC_ID; | |
1430 | else if (rqst->associd.desc_len != | |
1431 | fcnvme_lsdesc_len( | |
1432 | sizeof(struct fcnvme_lsdesc_assoc_id))) | |
1433 | ret = VERR_ASSOC_ID_LEN; | |
1434 | else if (rqst->connect_cmd.desc_tag != | |
1435 | cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD)) | |
1436 | ret = VERR_CR_CONN_CMD; | |
1437 | else if (rqst->connect_cmd.desc_len != | |
1438 | fcnvme_lsdesc_len( | |
1439 | sizeof(struct fcnvme_lsdesc_cr_conn_cmd))) | |
1440 | ret = VERR_CR_CONN_CMD_LEN; | |
1441 | else if (!rqst->connect_cmd.ersp_ratio || | |
1442 | (be16_to_cpu(rqst->connect_cmd.ersp_ratio) >= | |
1443 | be16_to_cpu(rqst->connect_cmd.sqsize))) | |
1444 | ret = VERR_ERSP_RATIO; | |
1445 | ||
1446 | else { | |
1447 | /* new io queue */ | |
1448 | iod->assoc = nvmet_fc_find_target_assoc(tgtport, | |
1449 | be64_to_cpu(rqst->associd.association_id)); | |
1450 | if (!iod->assoc) | |
1451 | ret = VERR_NO_ASSOC; | |
1452 | else { | |
1453 | queue = nvmet_fc_alloc_target_queue(iod->assoc, | |
1454 | be16_to_cpu(rqst->connect_cmd.qid), | |
1455 | be16_to_cpu(rqst->connect_cmd.sqsize)); | |
1456 | if (!queue) | |
1457 | ret = VERR_QUEUE_ALLOC_FAIL; | |
1458 | ||
1459 | /* release get taken in nvmet_fc_find_target_assoc */ | |
1460 | nvmet_fc_tgt_a_put(iod->assoc); | |
1461 | } | |
1462 | } | |
1463 | ||
1464 | if (ret) { | |
1465 | dev_err(tgtport->dev, | |
1466 | "Create Connection LS failed: %s\n", | |
1467 | validation_errors[ret]); | |
1468 | iod->lsreq->rsplen = nvmet_fc_format_rjt(acc, | |
1469 | NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd, | |
1470 | (ret == VERR_NO_ASSOC) ? | |
4083aa98 JS |
1471 | FCNVME_RJT_RC_INV_ASSOC : |
1472 | FCNVME_RJT_RC_LOGIC, | |
1473 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1474 | return; |
1475 | } | |
1476 | ||
1477 | queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio); | |
1478 | atomic_set(&queue->connected, 1); | |
1479 | queue->sqhd = 0; /* best place to init value */ | |
1480 | ||
1481 | /* format a response */ | |
1482 | ||
1483 | iod->lsreq->rsplen = sizeof(*acc); | |
1484 | ||
1485 | nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, | |
1486 | fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)), | |
1487 | FCNVME_LS_CREATE_CONNECTION); | |
1488 | acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); | |
1489 | acc->connectid.desc_len = | |
1490 | fcnvme_lsdesc_len( | |
1491 | sizeof(struct fcnvme_lsdesc_conn_id)); | |
1492 | acc->connectid.connection_id = | |
1493 | cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, | |
1494 | be16_to_cpu(rqst->connect_cmd.qid))); | |
1495 | } | |
1496 | ||
1497 | static void | |
1498 | nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport, | |
1499 | struct nvmet_fc_ls_iod *iod) | |
1500 | { | |
1501 | struct fcnvme_ls_disconnect_rqst *rqst = | |
1502 | (struct fcnvme_ls_disconnect_rqst *)iod->rqstbuf; | |
1503 | struct fcnvme_ls_disconnect_acc *acc = | |
1504 | (struct fcnvme_ls_disconnect_acc *)iod->rspbuf; | |
c5343203 JS |
1505 | struct nvmet_fc_tgt_assoc *assoc; |
1506 | int ret = 0; | |
c5343203 JS |
1507 | |
1508 | memset(acc, 0, sizeof(*acc)); | |
1509 | ||
1510 | if (iod->rqstdatalen < sizeof(struct fcnvme_ls_disconnect_rqst)) | |
1511 | ret = VERR_DISCONN_LEN; | |
1512 | else if (rqst->desc_list_len != | |
1513 | fcnvme_lsdesc_len( | |
1514 | sizeof(struct fcnvme_ls_disconnect_rqst))) | |
1515 | ret = VERR_DISCONN_RQST_LEN; | |
1516 | else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) | |
1517 | ret = VERR_ASSOC_ID; | |
1518 | else if (rqst->associd.desc_len != | |
1519 | fcnvme_lsdesc_len( | |
1520 | sizeof(struct fcnvme_lsdesc_assoc_id))) | |
1521 | ret = VERR_ASSOC_ID_LEN; | |
1522 | else if (rqst->discon_cmd.desc_tag != | |
1523 | cpu_to_be32(FCNVME_LSDESC_DISCONN_CMD)) | |
1524 | ret = VERR_DISCONN_CMD; | |
1525 | else if (rqst->discon_cmd.desc_len != | |
1526 | fcnvme_lsdesc_len( | |
1527 | sizeof(struct fcnvme_lsdesc_disconn_cmd))) | |
1528 | ret = VERR_DISCONN_CMD_LEN; | |
1529 | else if ((rqst->discon_cmd.scope != FCNVME_DISCONN_ASSOCIATION) && | |
1530 | (rqst->discon_cmd.scope != FCNVME_DISCONN_CONNECTION)) | |
1531 | ret = VERR_DISCONN_SCOPE; | |
1532 | else { | |
1533 | /* match an active association */ | |
1534 | assoc = nvmet_fc_find_target_assoc(tgtport, | |
1535 | be64_to_cpu(rqst->associd.association_id)); | |
1536 | iod->assoc = assoc; | |
404ec31d | 1537 | if (!assoc) |
c5343203 JS |
1538 | ret = VERR_NO_ASSOC; |
1539 | } | |
1540 | ||
1541 | if (ret) { | |
1542 | dev_err(tgtport->dev, | |
1543 | "Disconnect LS failed: %s\n", | |
1544 | validation_errors[ret]); | |
1545 | iod->lsreq->rsplen = nvmet_fc_format_rjt(acc, | |
1546 | NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd, | |
4083aa98 JS |
1547 | (ret == VERR_NO_ASSOC) ? |
1548 | FCNVME_RJT_RC_INV_ASSOC : | |
1549 | (ret == VERR_NO_CONN) ? | |
1550 | FCNVME_RJT_RC_INV_CONN : | |
1551 | FCNVME_RJT_RC_LOGIC, | |
1552 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1553 | return; |
1554 | } | |
1555 | ||
1556 | /* format a response */ | |
1557 | ||
1558 | iod->lsreq->rsplen = sizeof(*acc); | |
1559 | ||
1560 | nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, | |
1561 | fcnvme_lsdesc_len( | |
1562 | sizeof(struct fcnvme_ls_disconnect_acc)), | |
1563 | FCNVME_LS_DISCONNECT); | |
1564 | ||
c5343203 JS |
1565 | /* release get taken in nvmet_fc_find_target_assoc */ |
1566 | nvmet_fc_tgt_a_put(iod->assoc); | |
1567 | ||
404ec31d | 1568 | nvmet_fc_delete_target_assoc(iod->assoc); |
c5343203 JS |
1569 | } |
1570 | ||
1571 | ||
1572 | /* *********************** NVME Ctrl Routines **************************** */ | |
1573 | ||
1574 | ||
1575 | static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req); | |
1576 | ||
e929f06d | 1577 | static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops; |
c5343203 JS |
1578 | |
1579 | static void | |
1580 | nvmet_fc_xmt_ls_rsp_done(struct nvmefc_tgt_ls_req *lsreq) | |
1581 | { | |
1582 | struct nvmet_fc_ls_iod *iod = lsreq->nvmet_fc_private; | |
1583 | struct nvmet_fc_tgtport *tgtport = iod->tgtport; | |
1584 | ||
1585 | fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma, | |
1586 | NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE); | |
1587 | nvmet_fc_free_ls_iod(tgtport, iod); | |
1588 | nvmet_fc_tgtport_put(tgtport); | |
1589 | } | |
1590 | ||
1591 | static void | |
1592 | nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, | |
1593 | struct nvmet_fc_ls_iod *iod) | |
1594 | { | |
1595 | int ret; | |
1596 | ||
1597 | fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma, | |
1598 | NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE); | |
1599 | ||
1600 | ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsreq); | |
1601 | if (ret) | |
1602 | nvmet_fc_xmt_ls_rsp_done(iod->lsreq); | |
1603 | } | |
1604 | ||
1605 | /* | |
1606 | * Actual processing routine for received FC-NVME LS Requests from the LLD | |
1607 | */ | |
1608 | static void | |
1609 | nvmet_fc_handle_ls_rqst(struct nvmet_fc_tgtport *tgtport, | |
1610 | struct nvmet_fc_ls_iod *iod) | |
1611 | { | |
1612 | struct fcnvme_ls_rqst_w0 *w0 = | |
1613 | (struct fcnvme_ls_rqst_w0 *)iod->rqstbuf; | |
1614 | ||
1615 | iod->lsreq->nvmet_fc_private = iod; | |
1616 | iod->lsreq->rspbuf = iod->rspbuf; | |
1617 | iod->lsreq->rspdma = iod->rspdma; | |
1618 | iod->lsreq->done = nvmet_fc_xmt_ls_rsp_done; | |
1619 | /* Be preventative. handlers will later set to valid length */ | |
1620 | iod->lsreq->rsplen = 0; | |
1621 | ||
1622 | iod->assoc = NULL; | |
1623 | ||
1624 | /* | |
1625 | * handlers: | |
1626 | * parse request input, execute the request, and format the | |
1627 | * LS response | |
1628 | */ | |
1629 | switch (w0->ls_cmd) { | |
1630 | case FCNVME_LS_CREATE_ASSOCIATION: | |
1631 | /* Creates Association and initial Admin Queue/Connection */ | |
1632 | nvmet_fc_ls_create_association(tgtport, iod); | |
1633 | break; | |
1634 | case FCNVME_LS_CREATE_CONNECTION: | |
1635 | /* Creates an IO Queue/Connection */ | |
1636 | nvmet_fc_ls_create_connection(tgtport, iod); | |
1637 | break; | |
1638 | case FCNVME_LS_DISCONNECT: | |
1639 | /* Terminate a Queue/Connection or the Association */ | |
1640 | nvmet_fc_ls_disconnect(tgtport, iod); | |
1641 | break; | |
1642 | default: | |
1643 | iod->lsreq->rsplen = nvmet_fc_format_rjt(iod->rspbuf, | |
1644 | NVME_FC_MAX_LS_BUFFER_SIZE, w0->ls_cmd, | |
4083aa98 | 1645 | FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0); |
c5343203 JS |
1646 | } |
1647 | ||
1648 | nvmet_fc_xmt_ls_rsp(tgtport, iod); | |
1649 | } | |
1650 | ||
1651 | /* | |
1652 | * Actual processing routine for received FC-NVME LS Requests from the LLD | |
1653 | */ | |
1654 | static void | |
1655 | nvmet_fc_handle_ls_rqst_work(struct work_struct *work) | |
1656 | { | |
1657 | struct nvmet_fc_ls_iod *iod = | |
1658 | container_of(work, struct nvmet_fc_ls_iod, work); | |
1659 | struct nvmet_fc_tgtport *tgtport = iod->tgtport; | |
1660 | ||
1661 | nvmet_fc_handle_ls_rqst(tgtport, iod); | |
1662 | } | |
1663 | ||
1664 | ||
1665 | /** | |
1666 | * nvmet_fc_rcv_ls_req - transport entry point called by an LLDD | |
1667 | * upon the reception of a NVME LS request. | |
1668 | * | |
1669 | * The nvmet-fc layer will copy payload to an internal structure for | |
1670 | * processing. As such, upon completion of the routine, the LLDD may | |
1671 | * immediately free/reuse the LS request buffer passed in the call. | |
1672 | * | |
1673 | * If this routine returns error, the LLDD should abort the exchange. | |
1674 | * | |
1c466527 | 1675 | * @target_port: pointer to the (registered) target port the LS was |
c5343203 JS |
1676 | * received on. |
1677 | * @lsreq: pointer to a lsreq request structure to be used to reference | |
1678 | * the exchange corresponding to the LS. | |
1679 | * @lsreqbuf: pointer to the buffer containing the LS Request | |
1680 | * @lsreqbuf_len: length, in bytes, of the received LS request | |
1681 | */ | |
1682 | int | |
1683 | nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port, | |
1684 | struct nvmefc_tgt_ls_req *lsreq, | |
1685 | void *lsreqbuf, u32 lsreqbuf_len) | |
1686 | { | |
1687 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
1688 | struct nvmet_fc_ls_iod *iod; | |
1689 | ||
1690 | if (lsreqbuf_len > NVME_FC_MAX_LS_BUFFER_SIZE) | |
1691 | return -E2BIG; | |
1692 | ||
1693 | if (!nvmet_fc_tgtport_get(tgtport)) | |
1694 | return -ESHUTDOWN; | |
1695 | ||
1696 | iod = nvmet_fc_alloc_ls_iod(tgtport); | |
1697 | if (!iod) { | |
1698 | nvmet_fc_tgtport_put(tgtport); | |
1699 | return -ENOENT; | |
1700 | } | |
1701 | ||
1702 | iod->lsreq = lsreq; | |
1703 | iod->fcpreq = NULL; | |
1704 | memcpy(iod->rqstbuf, lsreqbuf, lsreqbuf_len); | |
1705 | iod->rqstdatalen = lsreqbuf_len; | |
1706 | ||
1707 | schedule_work(&iod->work); | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_ls_req); | |
1712 | ||
1713 | ||
1714 | /* | |
1715 | * ********************** | |
1716 | * Start of FCP handling | |
1717 | * ********************** | |
1718 | */ | |
1719 | ||
1720 | static int | |
1721 | nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod) | |
1722 | { | |
1723 | struct scatterlist *sg; | |
c5343203 | 1724 | unsigned int nent; |
c5343203 | 1725 | |
4442b56f | 1726 | sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent); |
c5343203 JS |
1727 | if (!sg) |
1728 | goto out; | |
1729 | ||
c5343203 JS |
1730 | fod->data_sg = sg; |
1731 | fod->data_sg_cnt = nent; | |
1732 | fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent, | |
1733 | ((fod->io_dir == NVMET_FCP_WRITE) ? | |
1734 | DMA_FROM_DEVICE : DMA_TO_DEVICE)); | |
1735 | /* note: write from initiator perspective */ | |
d082dc15 | 1736 | fod->next_sg = fod->data_sg; |
c5343203 JS |
1737 | |
1738 | return 0; | |
1739 | ||
c5343203 JS |
1740 | out: |
1741 | return NVME_SC_INTERNAL; | |
1742 | } | |
1743 | ||
1744 | static void | |
1745 | nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod) | |
1746 | { | |
c5343203 JS |
1747 | if (!fod->data_sg || !fod->data_sg_cnt) |
1748 | return; | |
1749 | ||
1750 | fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt, | |
1751 | ((fod->io_dir == NVMET_FCP_WRITE) ? | |
1752 | DMA_FROM_DEVICE : DMA_TO_DEVICE)); | |
4442b56f | 1753 | sgl_free(fod->data_sg); |
c820ad4c JS |
1754 | fod->data_sg = NULL; |
1755 | fod->data_sg_cnt = 0; | |
c5343203 JS |
1756 | } |
1757 | ||
1758 | ||
1759 | static bool | |
1760 | queue_90percent_full(struct nvmet_fc_tgt_queue *q, u32 sqhd) | |
1761 | { | |
1762 | u32 sqtail, used; | |
1763 | ||
1764 | /* egad, this is ugly. And sqtail is just a best guess */ | |
1765 | sqtail = atomic_read(&q->sqtail) % q->sqsize; | |
1766 | ||
1767 | used = (sqtail < sqhd) ? (sqtail + q->sqsize - sqhd) : (sqtail - sqhd); | |
1768 | return ((used * 10) >= (((u32)(q->sqsize - 1) * 9))); | |
1769 | } | |
1770 | ||
1771 | /* | |
1772 | * Prep RSP payload. | |
1773 | * May be a NVMET_FCOP_RSP or NVMET_FCOP_READDATA_RSP op | |
1774 | */ | |
1775 | static void | |
1776 | nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, | |
1777 | struct nvmet_fc_fcp_iod *fod) | |
1778 | { | |
1779 | struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf; | |
1780 | struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; | |
1781 | struct nvme_completion *cqe = &ersp->cqe; | |
1782 | u32 *cqewd = (u32 *)cqe; | |
1783 | bool send_ersp = false; | |
1784 | u32 rsn, rspcnt, xfr_length; | |
1785 | ||
1786 | if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP) | |
5e62d5c9 | 1787 | xfr_length = fod->req.transfer_len; |
c5343203 JS |
1788 | else |
1789 | xfr_length = fod->offset; | |
1790 | ||
1791 | /* | |
1792 | * check to see if we can send a 0's rsp. | |
1793 | * Note: to send a 0's response, the NVME-FC host transport will | |
1794 | * recreate the CQE. The host transport knows: sq id, SQHD (last | |
1795 | * seen in an ersp), and command_id. Thus it will create a | |
1796 | * zero-filled CQE with those known fields filled in. Transport | |
1797 | * must send an ersp for any condition where the cqe won't match | |
1798 | * this. | |
1799 | * | |
1800 | * Here are the FC-NVME mandated cases where we must send an ersp: | |
1801 | * every N responses, where N=ersp_ratio | |
1802 | * force fabric commands to send ersp's (not in FC-NVME but good | |
1803 | * practice) | |
1804 | * normal cmds: any time status is non-zero, or status is zero | |
1805 | * but words 0 or 1 are non-zero. | |
1806 | * the SQ is 90% or more full | |
1807 | * the cmd is a fused command | |
1808 | * transferred data length not equal to cmd iu length | |
1809 | */ | |
1810 | rspcnt = atomic_inc_return(&fod->queue->zrspcnt); | |
1811 | if (!(rspcnt % fod->queue->ersp_ratio) || | |
1812 | sqe->opcode == nvme_fabrics_command || | |
5e62d5c9 | 1813 | xfr_length != fod->req.transfer_len || |
c5343203 JS |
1814 | (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] || |
1815 | (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) || | |
8ad76cf1 | 1816 | queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head))) |
c5343203 JS |
1817 | send_ersp = true; |
1818 | ||
1819 | /* re-set the fields */ | |
1820 | fod->fcpreq->rspaddr = ersp; | |
1821 | fod->fcpreq->rspdma = fod->rspdma; | |
1822 | ||
1823 | if (!send_ersp) { | |
1824 | memset(ersp, 0, NVME_FC_SIZEOF_ZEROS_RSP); | |
1825 | fod->fcpreq->rsplen = NVME_FC_SIZEOF_ZEROS_RSP; | |
1826 | } else { | |
1827 | ersp->iu_len = cpu_to_be16(sizeof(*ersp)/sizeof(u32)); | |
1828 | rsn = atomic_inc_return(&fod->queue->rsn); | |
1829 | ersp->rsn = cpu_to_be32(rsn); | |
1830 | ersp->xfrd_len = cpu_to_be32(xfr_length); | |
1831 | fod->fcpreq->rsplen = sizeof(*ersp); | |
1832 | } | |
1833 | ||
1834 | fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma, | |
1835 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
1836 | } | |
1837 | ||
1838 | static void nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq); | |
1839 | ||
a97ec51b JS |
1840 | static void |
1841 | nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport, | |
1842 | struct nvmet_fc_fcp_iod *fod) | |
1843 | { | |
1844 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
1845 | ||
1846 | /* data no longer needed */ | |
1847 | nvmet_fc_free_tgt_pgs(fod); | |
1848 | ||
1849 | /* | |
1850 | * if an ABTS was received or we issued the fcp_abort early | |
1851 | * don't call abort routine again. | |
1852 | */ | |
1853 | /* no need to take lock - lock was taken earlier to get here */ | |
1854 | if (!fod->aborted) | |
1855 | tgtport->ops->fcp_abort(&tgtport->fc_target_port, fcpreq); | |
1856 | ||
1857 | nvmet_fc_free_fcp_iod(fod->queue, fod); | |
1858 | } | |
1859 | ||
c5343203 JS |
1860 | static void |
1861 | nvmet_fc_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport, | |
1862 | struct nvmet_fc_fcp_iod *fod) | |
1863 | { | |
1864 | int ret; | |
1865 | ||
1866 | fod->fcpreq->op = NVMET_FCOP_RSP; | |
1867 | fod->fcpreq->timeout = 0; | |
1868 | ||
1869 | nvmet_fc_prep_fcp_rsp(tgtport, fod); | |
1870 | ||
1871 | ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); | |
1872 | if (ret) | |
a97ec51b | 1873 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
1874 | } |
1875 | ||
1876 | static void | |
1877 | nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, | |
1878 | struct nvmet_fc_fcp_iod *fod, u8 op) | |
1879 | { | |
1880 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
d082dc15 | 1881 | struct scatterlist *sg = fod->next_sg; |
a97ec51b | 1882 | unsigned long flags; |
d082dc15 JS |
1883 | u32 remaininglen = fod->req.transfer_len - fod->offset; |
1884 | u32 tlen = 0; | |
c5343203 JS |
1885 | int ret; |
1886 | ||
1887 | fcpreq->op = op; | |
1888 | fcpreq->offset = fod->offset; | |
1889 | fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC; | |
48fa362b | 1890 | |
d082dc15 JS |
1891 | /* |
1892 | * for next sequence: | |
1893 | * break at a sg element boundary | |
1894 | * attempt to keep sequence length capped at | |
1895 | * NVMET_FC_MAX_SEQ_LENGTH but allow sequence to | |
1896 | * be longer if a single sg element is larger | |
1897 | * than that amount. This is done to avoid creating | |
1898 | * a new sg list to use for the tgtport api. | |
1899 | */ | |
1900 | fcpreq->sg = sg; | |
1901 | fcpreq->sg_cnt = 0; | |
1902 | while (tlen < remaininglen && | |
1903 | fcpreq->sg_cnt < tgtport->max_sg_cnt && | |
1904 | tlen + sg_dma_len(sg) < NVMET_FC_MAX_SEQ_LENGTH) { | |
1905 | fcpreq->sg_cnt++; | |
1906 | tlen += sg_dma_len(sg); | |
1907 | sg = sg_next(sg); | |
1908 | } | |
1909 | if (tlen < remaininglen && fcpreq->sg_cnt == 0) { | |
1910 | fcpreq->sg_cnt++; | |
1911 | tlen += min_t(u32, sg_dma_len(sg), remaininglen); | |
1912 | sg = sg_next(sg); | |
1913 | } | |
1914 | if (tlen < remaininglen) | |
1915 | fod->next_sg = sg; | |
1916 | else | |
1917 | fod->next_sg = NULL; | |
1918 | ||
c5343203 JS |
1919 | fcpreq->transfer_length = tlen; |
1920 | fcpreq->transferred_length = 0; | |
1921 | fcpreq->fcp_error = 0; | |
1922 | fcpreq->rsplen = 0; | |
1923 | ||
c5343203 JS |
1924 | /* |
1925 | * If the last READDATA request: check if LLDD supports | |
1926 | * combined xfr with response. | |
1927 | */ | |
1928 | if ((op == NVMET_FCOP_READDATA) && | |
5e62d5c9 | 1929 | ((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) && |
c5343203 JS |
1930 | (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) { |
1931 | fcpreq->op = NVMET_FCOP_READDATA_RSP; | |
1932 | nvmet_fc_prep_fcp_rsp(tgtport, fod); | |
1933 | } | |
1934 | ||
1935 | ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); | |
1936 | if (ret) { | |
1937 | /* | |
1938 | * should be ok to set w/o lock as its in the thread of | |
1939 | * execution (not an async timer routine) and doesn't | |
1940 | * contend with any clearing action | |
1941 | */ | |
1942 | fod->abort = true; | |
1943 | ||
a97ec51b JS |
1944 | if (op == NVMET_FCOP_WRITEDATA) { |
1945 | spin_lock_irqsave(&fod->flock, flags); | |
1946 | fod->writedataactive = false; | |
1947 | spin_unlock_irqrestore(&fod->flock, flags); | |
29b3d26e | 1948 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
a97ec51b | 1949 | } else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ { |
c5343203 JS |
1950 | fcpreq->fcp_error = ret; |
1951 | fcpreq->transferred_length = 0; | |
1952 | nvmet_fc_xmt_fcp_op_done(fod->fcpreq); | |
1953 | } | |
1954 | } | |
1955 | } | |
1956 | ||
a97ec51b JS |
1957 | static inline bool |
1958 | __nvmet_fc_fod_op_abort(struct nvmet_fc_fcp_iod *fod, bool abort) | |
1959 | { | |
1960 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
1961 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
1962 | ||
1963 | /* if in the middle of an io and we need to tear down */ | |
1964 | if (abort) { | |
1965 | if (fcpreq->op == NVMET_FCOP_WRITEDATA) { | |
29b3d26e | 1966 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
a97ec51b JS |
1967 | return true; |
1968 | } | |
1969 | ||
1970 | nvmet_fc_abort_op(tgtport, fod); | |
1971 | return true; | |
1972 | } | |
1973 | ||
1974 | return false; | |
1975 | } | |
1976 | ||
39498fae JS |
1977 | /* |
1978 | * actual done handler for FCP operations when completed by the lldd | |
1979 | */ | |
c5343203 | 1980 | static void |
39498fae | 1981 | nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) |
c5343203 | 1982 | { |
39498fae | 1983 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; |
c5343203 JS |
1984 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; |
1985 | unsigned long flags; | |
1986 | bool abort; | |
1987 | ||
1988 | spin_lock_irqsave(&fod->flock, flags); | |
1989 | abort = fod->abort; | |
a97ec51b | 1990 | fod->writedataactive = false; |
c5343203 JS |
1991 | spin_unlock_irqrestore(&fod->flock, flags); |
1992 | ||
c5343203 JS |
1993 | switch (fcpreq->op) { |
1994 | ||
1995 | case NVMET_FCOP_WRITEDATA: | |
a97ec51b JS |
1996 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
1997 | return; | |
f64935ab | 1998 | if (fcpreq->fcp_error || |
c5343203 | 1999 | fcpreq->transferred_length != fcpreq->transfer_length) { |
a97ec51b JS |
2000 | spin_lock(&fod->flock); |
2001 | fod->abort = true; | |
2002 | spin_unlock(&fod->flock); | |
2003 | ||
29b3d26e | 2004 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
c5343203 JS |
2005 | return; |
2006 | } | |
2007 | ||
2008 | fod->offset += fcpreq->transferred_length; | |
5e62d5c9 | 2009 | if (fod->offset != fod->req.transfer_len) { |
a97ec51b JS |
2010 | spin_lock_irqsave(&fod->flock, flags); |
2011 | fod->writedataactive = true; | |
2012 | spin_unlock_irqrestore(&fod->flock, flags); | |
2013 | ||
c5343203 JS |
2014 | /* transfer the next chunk */ |
2015 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2016 | NVMET_FCOP_WRITEDATA); | |
2017 | return; | |
2018 | } | |
2019 | ||
2020 | /* data transfer complete, resume with nvmet layer */ | |
5e62d5c9 | 2021 | nvmet_req_execute(&fod->req); |
c5343203 JS |
2022 | break; |
2023 | ||
2024 | case NVMET_FCOP_READDATA: | |
2025 | case NVMET_FCOP_READDATA_RSP: | |
a97ec51b JS |
2026 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2027 | return; | |
f64935ab | 2028 | if (fcpreq->fcp_error || |
c5343203 | 2029 | fcpreq->transferred_length != fcpreq->transfer_length) { |
a97ec51b | 2030 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2031 | return; |
2032 | } | |
2033 | ||
2034 | /* success */ | |
2035 | ||
2036 | if (fcpreq->op == NVMET_FCOP_READDATA_RSP) { | |
2037 | /* data no longer needed */ | |
2038 | nvmet_fc_free_tgt_pgs(fod); | |
c5343203 JS |
2039 | nvmet_fc_free_fcp_iod(fod->queue, fod); |
2040 | return; | |
2041 | } | |
2042 | ||
2043 | fod->offset += fcpreq->transferred_length; | |
5e62d5c9 | 2044 | if (fod->offset != fod->req.transfer_len) { |
c5343203 JS |
2045 | /* transfer the next chunk */ |
2046 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2047 | NVMET_FCOP_READDATA); | |
2048 | return; | |
2049 | } | |
2050 | ||
2051 | /* data transfer complete, send response */ | |
2052 | ||
2053 | /* data no longer needed */ | |
2054 | nvmet_fc_free_tgt_pgs(fod); | |
2055 | ||
2056 | nvmet_fc_xmt_fcp_rsp(tgtport, fod); | |
2057 | ||
2058 | break; | |
2059 | ||
2060 | case NVMET_FCOP_RSP: | |
a97ec51b JS |
2061 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2062 | return; | |
c5343203 JS |
2063 | nvmet_fc_free_fcp_iod(fod->queue, fod); |
2064 | break; | |
2065 | ||
2066 | default: | |
c5343203 JS |
2067 | break; |
2068 | } | |
2069 | } | |
2070 | ||
39498fae JS |
2071 | static void |
2072 | nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq) | |
2073 | { | |
2074 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
39498fae | 2075 | |
6e2e312e | 2076 | nvmet_fc_fod_op_done(fod); |
39498fae JS |
2077 | } |
2078 | ||
c5343203 JS |
2079 | /* |
2080 | * actual completion handler after execution by the nvmet layer | |
2081 | */ | |
2082 | static void | |
2083 | __nvmet_fc_fcp_nvme_cmd_done(struct nvmet_fc_tgtport *tgtport, | |
2084 | struct nvmet_fc_fcp_iod *fod, int status) | |
2085 | { | |
2086 | struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; | |
2087 | struct nvme_completion *cqe = &fod->rspiubuf.cqe; | |
2088 | unsigned long flags; | |
2089 | bool abort; | |
2090 | ||
2091 | spin_lock_irqsave(&fod->flock, flags); | |
2092 | abort = fod->abort; | |
2093 | spin_unlock_irqrestore(&fod->flock, flags); | |
2094 | ||
2095 | /* if we have a CQE, snoop the last sq_head value */ | |
2096 | if (!status) | |
2097 | fod->queue->sqhd = cqe->sq_head; | |
2098 | ||
2099 | if (abort) { | |
a97ec51b | 2100 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2101 | return; |
2102 | } | |
2103 | ||
2104 | /* if an error handling the cmd post initial parsing */ | |
2105 | if (status) { | |
2106 | /* fudge up a failed CQE status for our transport error */ | |
2107 | memset(cqe, 0, sizeof(*cqe)); | |
2108 | cqe->sq_head = fod->queue->sqhd; /* echo last cqe sqhd */ | |
2109 | cqe->sq_id = cpu_to_le16(fod->queue->qid); | |
2110 | cqe->command_id = sqe->command_id; | |
2111 | cqe->status = cpu_to_le16(status); | |
2112 | } else { | |
2113 | ||
2114 | /* | |
2115 | * try to push the data even if the SQE status is non-zero. | |
2116 | * There may be a status where data still was intended to | |
2117 | * be moved | |
2118 | */ | |
2119 | if ((fod->io_dir == NVMET_FCP_READ) && (fod->data_sg_cnt)) { | |
2120 | /* push the data over before sending rsp */ | |
2121 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2122 | NVMET_FCOP_READDATA); | |
2123 | return; | |
2124 | } | |
2125 | ||
2126 | /* writes & no data - fall thru */ | |
2127 | } | |
2128 | ||
2129 | /* data no longer needed */ | |
2130 | nvmet_fc_free_tgt_pgs(fod); | |
2131 | ||
2132 | nvmet_fc_xmt_fcp_rsp(tgtport, fod); | |
2133 | } | |
2134 | ||
2135 | ||
2136 | static void | |
2137 | nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req) | |
2138 | { | |
2139 | struct nvmet_fc_fcp_iod *fod = nvmet_req_to_fod(nvme_req); | |
2140 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
2141 | ||
2142 | __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, 0); | |
2143 | } | |
2144 | ||
2145 | ||
2146 | /* | |
ea96d649 | 2147 | * Actual processing routine for received FC-NVME I/O Requests from the LLD |
c5343203 | 2148 | */ |
edba98dd | 2149 | static void |
c5343203 JS |
2150 | nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, |
2151 | struct nvmet_fc_fcp_iod *fod) | |
2152 | { | |
2153 | struct nvme_fc_cmd_iu *cmdiu = &fod->cmdiubuf; | |
cce75291 | 2154 | u32 xfrlen = be32_to_cpu(cmdiu->data_len); |
c5343203 JS |
2155 | int ret; |
2156 | ||
ea96d649 JS |
2157 | /* |
2158 | * if there is no nvmet mapping to the targetport there | |
2159 | * shouldn't be requests. just terminate them. | |
2160 | */ | |
2161 | if (!tgtport->pe) | |
2162 | goto transport_error; | |
2163 | ||
c5343203 JS |
2164 | /* |
2165 | * Fused commands are currently not supported in the linux | |
2166 | * implementation. | |
2167 | * | |
2168 | * As such, the implementation of the FC transport does not | |
2169 | * look at the fused commands and order delivery to the upper | |
2170 | * layer until we have both based on csn. | |
2171 | */ | |
2172 | ||
2173 | fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done; | |
2174 | ||
c5343203 JS |
2175 | if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) { |
2176 | fod->io_dir = NVMET_FCP_WRITE; | |
2177 | if (!nvme_is_write(&cmdiu->sqe)) | |
2178 | goto transport_error; | |
2179 | } else if (cmdiu->flags & FCNVME_CMD_FLAGS_READ) { | |
2180 | fod->io_dir = NVMET_FCP_READ; | |
2181 | if (nvme_is_write(&cmdiu->sqe)) | |
2182 | goto transport_error; | |
2183 | } else { | |
2184 | fod->io_dir = NVMET_FCP_NODATA; | |
cce75291 | 2185 | if (xfrlen) |
c5343203 JS |
2186 | goto transport_error; |
2187 | } | |
2188 | ||
2189 | fod->req.cmd = &fod->cmdiubuf.sqe; | |
2190 | fod->req.rsp = &fod->rspiubuf.cqe; | |
ea96d649 | 2191 | fod->req.port = tgtport->pe->port; |
c5343203 | 2192 | |
c5343203 JS |
2193 | /* clear any response payload */ |
2194 | memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf)); | |
2195 | ||
188f7e8a JS |
2196 | fod->data_sg = NULL; |
2197 | fod->data_sg_cnt = 0; | |
2198 | ||
c5343203 JS |
2199 | ret = nvmet_req_init(&fod->req, |
2200 | &fod->queue->nvme_cq, | |
2201 | &fod->queue->nvme_sq, | |
2202 | &nvmet_fc_tgt_fcp_ops); | |
188f7e8a JS |
2203 | if (!ret) { |
2204 | /* bad SQE content or invalid ctrl state */ | |
2205 | /* nvmet layer has already called op done to send rsp. */ | |
c5343203 JS |
2206 | return; |
2207 | } | |
2208 | ||
cce75291 JS |
2209 | fod->req.transfer_len = xfrlen; |
2210 | ||
c5343203 JS |
2211 | /* keep a running counter of tail position */ |
2212 | atomic_inc(&fod->queue->sqtail); | |
2213 | ||
5e62d5c9 | 2214 | if (fod->req.transfer_len) { |
c5343203 JS |
2215 | ret = nvmet_fc_alloc_tgt_pgs(fod); |
2216 | if (ret) { | |
2217 | nvmet_req_complete(&fod->req, ret); | |
2218 | return; | |
2219 | } | |
2220 | } | |
2221 | fod->req.sg = fod->data_sg; | |
2222 | fod->req.sg_cnt = fod->data_sg_cnt; | |
2223 | fod->offset = 0; | |
c5343203 JS |
2224 | |
2225 | if (fod->io_dir == NVMET_FCP_WRITE) { | |
2226 | /* pull the data over before invoking nvmet layer */ | |
2227 | nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_WRITEDATA); | |
2228 | return; | |
2229 | } | |
2230 | ||
2231 | /* | |
2232 | * Reads or no data: | |
2233 | * | |
2234 | * can invoke the nvmet_layer now. If read data, cmd completion will | |
2235 | * push the data | |
2236 | */ | |
5e62d5c9 | 2237 | nvmet_req_execute(&fod->req); |
c5343203 JS |
2238 | return; |
2239 | ||
2240 | transport_error: | |
a97ec51b | 2241 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2242 | } |
2243 | ||
c5343203 JS |
2244 | /** |
2245 | * nvmet_fc_rcv_fcp_req - transport entry point called by an LLDD | |
2246 | * upon the reception of a NVME FCP CMD IU. | |
2247 | * | |
2248 | * Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc | |
2249 | * layer for processing. | |
2250 | * | |
0fb228d3 JS |
2251 | * The nvmet_fc layer allocates a local job structure (struct |
2252 | * nvmet_fc_fcp_iod) from the queue for the io and copies the | |
2253 | * CMD IU buffer to the job structure. As such, on a successful | |
2254 | * completion (returns 0), the LLDD may immediately free/reuse | |
2255 | * the CMD IU buffer passed in the call. | |
2256 | * | |
2257 | * However, in some circumstances, due to the packetized nature of FC | |
2258 | * and the api of the FC LLDD which may issue a hw command to send the | |
2259 | * response, but the LLDD may not get the hw completion for that command | |
2260 | * and upcall the nvmet_fc layer before a new command may be | |
2261 | * asynchronously received - its possible for a command to be received | |
2262 | * before the LLDD and nvmet_fc have recycled the job structure. It gives | |
2263 | * the appearance of more commands received than fits in the sq. | |
2264 | * To alleviate this scenario, a temporary queue is maintained in the | |
2265 | * transport for pending LLDD requests waiting for a queue job structure. | |
2266 | * In these "overrun" cases, a temporary queue element is allocated | |
2267 | * the LLDD request and CMD iu buffer information remembered, and the | |
2268 | * routine returns a -EOVERFLOW status. Subsequently, when a queue job | |
2269 | * structure is freed, it is immediately reallocated for anything on the | |
2270 | * pending request list. The LLDDs defer_rcv() callback is called, | |
2271 | * informing the LLDD that it may reuse the CMD IU buffer, and the io | |
2272 | * is then started normally with the transport. | |
c5343203 | 2273 | * |
0fb228d3 JS |
2274 | * The LLDD, when receiving an -EOVERFLOW completion status, is to treat |
2275 | * the completion as successful but must not reuse the CMD IU buffer | |
2276 | * until the LLDD's defer_rcv() callback has been called for the | |
2277 | * corresponding struct nvmefc_tgt_fcp_req pointer. | |
2278 | * | |
2279 | * If there is any other condition in which an error occurs, the | |
2280 | * transport will return a non-zero status indicating the error. | |
2281 | * In all cases other than -EOVERFLOW, the transport has not accepted the | |
2282 | * request and the LLDD should abort the exchange. | |
c5343203 JS |
2283 | * |
2284 | * @target_port: pointer to the (registered) target port the FCP CMD IU | |
19b58d94 | 2285 | * was received on. |
c5343203 JS |
2286 | * @fcpreq: pointer to a fcpreq request structure to be used to reference |
2287 | * the exchange corresponding to the FCP Exchange. | |
2288 | * @cmdiubuf: pointer to the buffer containing the FCP CMD IU | |
2289 | * @cmdiubuf_len: length, in bytes, of the received FCP CMD IU | |
2290 | */ | |
2291 | int | |
2292 | nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port, | |
2293 | struct nvmefc_tgt_fcp_req *fcpreq, | |
2294 | void *cmdiubuf, u32 cmdiubuf_len) | |
2295 | { | |
2296 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
2297 | struct nvme_fc_cmd_iu *cmdiu = cmdiubuf; | |
2298 | struct nvmet_fc_tgt_queue *queue; | |
2299 | struct nvmet_fc_fcp_iod *fod; | |
0fb228d3 JS |
2300 | struct nvmet_fc_defer_fcp_req *deferfcp; |
2301 | unsigned long flags; | |
c5343203 JS |
2302 | |
2303 | /* validate iu, so the connection id can be used to find the queue */ | |
2304 | if ((cmdiubuf_len != sizeof(*cmdiu)) || | |
2305 | (cmdiu->scsi_id != NVME_CMD_SCSI_ID) || | |
2306 | (cmdiu->fc_id != NVME_CMD_FC_ID) || | |
2307 | (be16_to_cpu(cmdiu->iu_len) != (sizeof(*cmdiu)/4))) | |
2308 | return -EIO; | |
2309 | ||
c5343203 JS |
2310 | queue = nvmet_fc_find_target_queue(tgtport, |
2311 | be64_to_cpu(cmdiu->connection_id)); | |
2312 | if (!queue) | |
2313 | return -ENOTCONN; | |
2314 | ||
2315 | /* | |
2316 | * note: reference taken by find_target_queue | |
2317 | * After successful fod allocation, the fod will inherit the | |
2318 | * ownership of that reference and will remove the reference | |
2319 | * when the fod is freed. | |
2320 | */ | |
2321 | ||
0fb228d3 JS |
2322 | spin_lock_irqsave(&queue->qlock, flags); |
2323 | ||
c5343203 | 2324 | fod = nvmet_fc_alloc_fcp_iod(queue); |
0fb228d3 JS |
2325 | if (fod) { |
2326 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2327 | ||
2328 | fcpreq->nvmet_fc_private = fod; | |
2329 | fod->fcpreq = fcpreq; | |
2330 | ||
2331 | memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len); | |
2332 | ||
2333 | nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq); | |
2334 | ||
2335 | return 0; | |
2336 | } | |
2337 | ||
2338 | if (!tgtport->ops->defer_rcv) { | |
2339 | spin_unlock_irqrestore(&queue->qlock, flags); | |
c5343203 JS |
2340 | /* release the queue lookup reference */ |
2341 | nvmet_fc_tgt_q_put(queue); | |
2342 | return -ENOENT; | |
2343 | } | |
2344 | ||
0fb228d3 JS |
2345 | deferfcp = list_first_entry_or_null(&queue->avail_defer_list, |
2346 | struct nvmet_fc_defer_fcp_req, req_list); | |
2347 | if (deferfcp) { | |
2348 | /* Just re-use one that was previously allocated */ | |
2349 | list_del(&deferfcp->req_list); | |
2350 | } else { | |
2351 | spin_unlock_irqrestore(&queue->qlock, flags); | |
c5343203 | 2352 | |
0fb228d3 JS |
2353 | /* Now we need to dynamically allocate one */ |
2354 | deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL); | |
2355 | if (!deferfcp) { | |
2356 | /* release the queue lookup reference */ | |
2357 | nvmet_fc_tgt_q_put(queue); | |
2358 | return -ENOMEM; | |
2359 | } | |
2360 | spin_lock_irqsave(&queue->qlock, flags); | |
2361 | } | |
c5343203 | 2362 | |
0fb228d3 JS |
2363 | /* For now, use rspaddr / rsplen to save payload information */ |
2364 | fcpreq->rspaddr = cmdiubuf; | |
2365 | fcpreq->rsplen = cmdiubuf_len; | |
2366 | deferfcp->fcp_req = fcpreq; | |
2367 | ||
2368 | /* defer processing till a fod becomes available */ | |
2369 | list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list); | |
2370 | ||
2371 | /* NOTE: the queue lookup reference is still valid */ | |
2372 | ||
2373 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2374 | ||
2375 | return -EOVERFLOW; | |
c5343203 JS |
2376 | } |
2377 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req); | |
2378 | ||
a97ec51b JS |
2379 | /** |
2380 | * nvmet_fc_rcv_fcp_abort - transport entry point called by an LLDD | |
2381 | * upon the reception of an ABTS for a FCP command | |
2382 | * | |
2383 | * Notify the transport that an ABTS has been received for a FCP command | |
2384 | * that had been given to the transport via nvmet_fc_rcv_fcp_req(). The | |
2385 | * LLDD believes the command is still being worked on | |
2386 | * (template_ops->fcp_req_release() has not been called). | |
2387 | * | |
2388 | * The transport will wait for any outstanding work (an op to the LLDD, | |
2389 | * which the lldd should complete with error due to the ABTS; or the | |
2390 | * completion from the nvmet layer of the nvme command), then will | |
2391 | * stop processing and call the nvmet_fc_rcv_fcp_req() callback to | |
2392 | * return the i/o context to the LLDD. The LLDD may send the BA_ACC | |
2393 | * to the ABTS either after return from this function (assuming any | |
2394 | * outstanding op work has been terminated) or upon the callback being | |
2395 | * called. | |
2396 | * | |
2397 | * @target_port: pointer to the (registered) target port the FCP CMD IU | |
2398 | * was received on. | |
2399 | * @fcpreq: pointer to the fcpreq request structure that corresponds | |
2400 | * to the exchange that received the ABTS. | |
2401 | */ | |
2402 | void | |
2403 | nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port, | |
2404 | struct nvmefc_tgt_fcp_req *fcpreq) | |
2405 | { | |
2406 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
2407 | struct nvmet_fc_tgt_queue *queue; | |
2408 | unsigned long flags; | |
2409 | ||
2410 | if (!fod || fod->fcpreq != fcpreq) | |
2411 | /* job appears to have already completed, ignore abort */ | |
2412 | return; | |
2413 | ||
2414 | queue = fod->queue; | |
2415 | ||
2416 | spin_lock_irqsave(&queue->qlock, flags); | |
2417 | if (fod->active) { | |
2418 | /* | |
2419 | * mark as abort. The abort handler, invoked upon completion | |
2420 | * of any work, will detect the aborted status and do the | |
2421 | * callback. | |
2422 | */ | |
2423 | spin_lock(&fod->flock); | |
2424 | fod->abort = true; | |
2425 | fod->aborted = true; | |
2426 | spin_unlock(&fod->flock); | |
2427 | } | |
2428 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2429 | } | |
2430 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort); | |
2431 | ||
c5343203 JS |
2432 | |
2433 | struct nvmet_fc_traddr { | |
2434 | u64 nn; | |
2435 | u64 pn; | |
2436 | }; | |
2437 | ||
c5343203 | 2438 | static int |
9c5358e1 | 2439 | __nvme_fc_parse_u64(substring_t *sstr, u64 *val) |
c5343203 | 2440 | { |
c5343203 JS |
2441 | u64 token64; |
2442 | ||
9c5358e1 JS |
2443 | if (match_u64(sstr, &token64)) |
2444 | return -EINVAL; | |
2445 | *val = token64; | |
c5343203 | 2446 | |
9c5358e1 JS |
2447 | return 0; |
2448 | } | |
c5343203 | 2449 | |
9c5358e1 JS |
2450 | /* |
2451 | * This routine validates and extracts the WWN's from the TRADDR string. | |
2452 | * As kernel parsers need the 0x to determine number base, universally | |
2453 | * build string to parse with 0x prefix before parsing name strings. | |
2454 | */ | |
2455 | static int | |
2456 | nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen) | |
2457 | { | |
2458 | char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1]; | |
2459 | substring_t wwn = { name, &name[sizeof(name)-1] }; | |
2460 | int nnoffset, pnoffset; | |
2461 | ||
d4e4230c | 2462 | /* validate if string is one of the 2 allowed formats */ |
9c5358e1 JS |
2463 | if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH && |
2464 | !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) && | |
2465 | !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET], | |
2466 | "pn-0x", NVME_FC_TRADDR_OXNNLEN)) { | |
2467 | nnoffset = NVME_FC_TRADDR_OXNNLEN; | |
2468 | pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET + | |
2469 | NVME_FC_TRADDR_OXNNLEN; | |
2470 | } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH && | |
2471 | !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) && | |
2472 | !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET], | |
2473 | "pn-", NVME_FC_TRADDR_NNLEN))) { | |
2474 | nnoffset = NVME_FC_TRADDR_NNLEN; | |
2475 | pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN; | |
2476 | } else | |
2477 | goto out_einval; | |
2478 | ||
2479 | name[0] = '0'; | |
2480 | name[1] = 'x'; | |
2481 | name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0; | |
2482 | ||
2483 | memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN); | |
2484 | if (__nvme_fc_parse_u64(&wwn, &traddr->nn)) | |
2485 | goto out_einval; | |
2486 | ||
2487 | memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN); | |
2488 | if (__nvme_fc_parse_u64(&wwn, &traddr->pn)) | |
2489 | goto out_einval; | |
c5343203 | 2490 | |
9c5358e1 JS |
2491 | return 0; |
2492 | ||
2493 | out_einval: | |
2494 | pr_warn("%s: bad traddr string\n", __func__); | |
2495 | return -EINVAL; | |
c5343203 JS |
2496 | } |
2497 | ||
2498 | static int | |
2499 | nvmet_fc_add_port(struct nvmet_port *port) | |
2500 | { | |
2501 | struct nvmet_fc_tgtport *tgtport; | |
ea96d649 | 2502 | struct nvmet_fc_port_entry *pe; |
c5343203 JS |
2503 | struct nvmet_fc_traddr traddr = { 0L, 0L }; |
2504 | unsigned long flags; | |
2505 | int ret; | |
2506 | ||
2507 | /* validate the address info */ | |
2508 | if ((port->disc_addr.trtype != NVMF_TRTYPE_FC) || | |
2509 | (port->disc_addr.adrfam != NVMF_ADDR_FAMILY_FC)) | |
2510 | return -EINVAL; | |
2511 | ||
2512 | /* map the traddr address info to a target port */ | |
2513 | ||
9c5358e1 JS |
2514 | ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr, |
2515 | sizeof(port->disc_addr.traddr)); | |
c5343203 JS |
2516 | if (ret) |
2517 | return ret; | |
2518 | ||
ea96d649 JS |
2519 | pe = kzalloc(sizeof(*pe), GFP_KERNEL); |
2520 | if (!pe) | |
2521 | return -ENOMEM; | |
2522 | ||
c5343203 JS |
2523 | ret = -ENXIO; |
2524 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
2525 | list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) { | |
2526 | if ((tgtport->fc_target_port.node_name == traddr.nn) && | |
2527 | (tgtport->fc_target_port.port_name == traddr.pn)) { | |
ea96d649 JS |
2528 | /* a FC port can only be 1 nvmet port id */ |
2529 | if (!tgtport->pe) { | |
2530 | nvmet_fc_portentry_bind(tgtport, pe, port); | |
2531 | ret = 0; | |
2532 | } else | |
2533 | ret = -EALREADY; | |
c5343203 JS |
2534 | break; |
2535 | } | |
2536 | } | |
2537 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
ea96d649 JS |
2538 | |
2539 | if (ret) | |
2540 | kfree(pe); | |
2541 | ||
c5343203 JS |
2542 | return ret; |
2543 | } | |
2544 | ||
2545 | static void | |
2546 | nvmet_fc_remove_port(struct nvmet_port *port) | |
2547 | { | |
ea96d649 JS |
2548 | struct nvmet_fc_port_entry *pe = port->priv; |
2549 | ||
2550 | nvmet_fc_portentry_unbind(pe); | |
2551 | ||
2552 | kfree(pe); | |
c5343203 JS |
2553 | } |
2554 | ||
e929f06d | 2555 | static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = { |
c5343203 JS |
2556 | .owner = THIS_MODULE, |
2557 | .type = NVMF_TRTYPE_FC, | |
2558 | .msdbd = 1, | |
2559 | .add_port = nvmet_fc_add_port, | |
2560 | .remove_port = nvmet_fc_remove_port, | |
2561 | .queue_response = nvmet_fc_fcp_nvme_cmd_done, | |
2562 | .delete_ctrl = nvmet_fc_delete_ctrl, | |
2563 | }; | |
2564 | ||
2565 | static int __init nvmet_fc_init_module(void) | |
2566 | { | |
2567 | return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops); | |
2568 | } | |
2569 | ||
2570 | static void __exit nvmet_fc_exit_module(void) | |
2571 | { | |
2572 | /* sanity check - all lports should be removed */ | |
2573 | if (!list_empty(&nvmet_fc_target_list)) | |
2574 | pr_warn("%s: targetport list not empty\n", __func__); | |
2575 | ||
2576 | nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops); | |
2577 | ||
2578 | ida_destroy(&nvmet_fc_tgtport_cnt); | |
2579 | } | |
2580 | ||
2581 | module_init(nvmet_fc_init_module); | |
2582 | module_exit(nvmet_fc_exit_module); | |
2583 | ||
2584 | MODULE_LICENSE("GPL v2"); |