Commit | Line | Data |
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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> | |
ca19bcd0 | 17 | #include "../host/fc.h" |
c5343203 JS |
18 | |
19 | ||
20 | /* *************************** Data Structures/Defines ****************** */ | |
21 | ||
22 | ||
17d78252 | 23 | #define NVMET_LS_CTX_COUNT 256 |
c5343203 | 24 | |
c5343203 JS |
25 | struct nvmet_fc_tgtport; |
26 | struct nvmet_fc_tgt_assoc; | |
27 | ||
47bf3241 | 28 | struct nvmet_fc_ls_iod { /* for an LS RQST RCV */ |
72e6329f | 29 | struct nvmefc_ls_rsp *lsrsp; |
c5343203 JS |
30 | struct nvmefc_tgt_fcp_req *fcpreq; /* only if RS */ |
31 | ||
349c694e | 32 | struct list_head ls_rcv_list; /* tgtport->ls_rcv_list */ |
c5343203 JS |
33 | |
34 | struct nvmet_fc_tgtport *tgtport; | |
35 | struct nvmet_fc_tgt_assoc *assoc; | |
58ab8ff9 | 36 | void *hosthandle; |
c5343203 | 37 | |
3b8281b0 JS |
38 | union nvmefc_ls_requests *rqstbuf; |
39 | union nvmefc_ls_responses *rspbuf; | |
c5343203 JS |
40 | u16 rqstdatalen; |
41 | dma_addr_t rspdma; | |
42 | ||
43 | struct scatterlist sg[2]; | |
44 | ||
45 | struct work_struct work; | |
46 | } __aligned(sizeof(unsigned long long)); | |
47 | ||
47bf3241 JS |
48 | struct nvmet_fc_ls_req_op { /* for an LS RQST XMT */ |
49 | struct nvmefc_ls_req ls_req; | |
50 | ||
51 | struct nvmet_fc_tgtport *tgtport; | |
52 | void *hosthandle; | |
53 | ||
54 | int ls_error; | |
55 | struct list_head lsreq_list; /* tgtport->ls_req_list */ | |
56 | bool req_queued; | |
57 | }; | |
58 | ||
59 | ||
d082dc15 | 60 | /* desired maximum for a single sequence - if sg list allows it */ |
48fa362b | 61 | #define NVMET_FC_MAX_SEQ_LENGTH (256 * 1024) |
c5343203 JS |
62 | |
63 | enum nvmet_fcp_datadir { | |
64 | NVMET_FCP_NODATA, | |
65 | NVMET_FCP_WRITE, | |
66 | NVMET_FCP_READ, | |
67 | NVMET_FCP_ABORTED, | |
68 | }; | |
69 | ||
70 | struct nvmet_fc_fcp_iod { | |
71 | struct nvmefc_tgt_fcp_req *fcpreq; | |
72 | ||
73 | struct nvme_fc_cmd_iu cmdiubuf; | |
74 | struct nvme_fc_ersp_iu rspiubuf; | |
75 | dma_addr_t rspdma; | |
d082dc15 | 76 | struct scatterlist *next_sg; |
c5343203 | 77 | struct scatterlist *data_sg; |
c5343203 | 78 | int data_sg_cnt; |
c5343203 JS |
79 | u32 offset; |
80 | enum nvmet_fcp_datadir io_dir; | |
81 | bool active; | |
82 | bool abort; | |
a97ec51b JS |
83 | bool aborted; |
84 | bool writedataactive; | |
c5343203 JS |
85 | spinlock_t flock; |
86 | ||
87 | struct nvmet_req req; | |
9d625f77 | 88 | struct work_struct defer_work; |
c5343203 JS |
89 | |
90 | struct nvmet_fc_tgtport *tgtport; | |
91 | struct nvmet_fc_tgt_queue *queue; | |
92 | ||
93 | struct list_head fcp_list; /* tgtport->fcp_list */ | |
94 | }; | |
95 | ||
96 | struct nvmet_fc_tgtport { | |
c5343203 JS |
97 | struct nvmet_fc_target_port fc_target_port; |
98 | ||
99 | struct list_head tgt_list; /* nvmet_fc_target_list */ | |
100 | struct device *dev; /* dev for dma mapping */ | |
101 | struct nvmet_fc_target_template *ops; | |
102 | ||
103 | struct nvmet_fc_ls_iod *iod; | |
104 | spinlock_t lock; | |
349c694e | 105 | struct list_head ls_rcv_list; |
47bf3241 | 106 | struct list_head ls_req_list; |
c5343203 JS |
107 | struct list_head ls_busylist; |
108 | struct list_head assoc_list; | |
58ab8ff9 | 109 | struct list_head host_list; |
c5343203 | 110 | struct ida assoc_cnt; |
ea96d649 | 111 | struct nvmet_fc_port_entry *pe; |
c5343203 | 112 | struct kref ref; |
48fa362b | 113 | u32 max_sg_cnt; |
710c69db DW |
114 | |
115 | struct work_struct put_work; | |
c5343203 JS |
116 | }; |
117 | ||
ea96d649 JS |
118 | struct nvmet_fc_port_entry { |
119 | struct nvmet_fc_tgtport *tgtport; | |
120 | struct nvmet_port *port; | |
121 | u64 node_name; | |
122 | u64 port_name; | |
123 | struct list_head pe_list; | |
124 | }; | |
125 | ||
0fb228d3 JS |
126 | struct nvmet_fc_defer_fcp_req { |
127 | struct list_head req_list; | |
128 | struct nvmefc_tgt_fcp_req *fcp_req; | |
129 | }; | |
130 | ||
c5343203 JS |
131 | struct nvmet_fc_tgt_queue { |
132 | bool ninetypercent; | |
133 | u16 qid; | |
134 | u16 sqsize; | |
135 | u16 ersp_ratio; | |
f63688a6 | 136 | __le16 sqhd; |
c5343203 JS |
137 | atomic_t connected; |
138 | atomic_t sqtail; | |
139 | atomic_t zrspcnt; | |
140 | atomic_t rsn; | |
141 | spinlock_t qlock; | |
c5343203 JS |
142 | struct nvmet_cq nvme_cq; |
143 | struct nvmet_sq nvme_sq; | |
144 | struct nvmet_fc_tgt_assoc *assoc; | |
c5343203 | 145 | struct list_head fod_list; |
0fb228d3 JS |
146 | struct list_head pending_cmd_list; |
147 | struct list_head avail_defer_list; | |
c5343203 JS |
148 | struct workqueue_struct *work_q; |
149 | struct kref ref; | |
ccd3129a KC |
150 | /* array of fcp_iods */ |
151 | struct nvmet_fc_fcp_iod fod[] __counted_by(sqsize); | |
c5343203 JS |
152 | } __aligned(sizeof(unsigned long long)); |
153 | ||
58ab8ff9 JS |
154 | struct nvmet_fc_hostport { |
155 | struct nvmet_fc_tgtport *tgtport; | |
156 | void *hosthandle; | |
157 | struct list_head host_list; | |
158 | struct kref ref; | |
159 | u8 invalid; | |
160 | }; | |
161 | ||
c5343203 JS |
162 | struct nvmet_fc_tgt_assoc { |
163 | u64 association_id; | |
164 | u32 a_id; | |
47bf3241 | 165 | atomic_t terminating; |
c5343203 | 166 | struct nvmet_fc_tgtport *tgtport; |
58ab8ff9 | 167 | struct nvmet_fc_hostport *hostport; |
47bf3241 | 168 | struct nvmet_fc_ls_iod *rcv_disconn; |
c5343203 | 169 | struct list_head a_list; |
4049dc96 | 170 | struct nvmet_fc_tgt_queue *queues[NVMET_NR_QUEUES + 1]; |
c5343203 | 171 | struct kref ref; |
a96d4bd8 | 172 | struct work_struct del_work; |
c5343203 JS |
173 | }; |
174 | ||
175 | ||
176 | static inline int | |
177 | nvmet_fc_iodnum(struct nvmet_fc_ls_iod *iodptr) | |
178 | { | |
179 | return (iodptr - iodptr->tgtport->iod); | |
180 | } | |
181 | ||
182 | static inline int | |
183 | nvmet_fc_fodnum(struct nvmet_fc_fcp_iod *fodptr) | |
184 | { | |
185 | return (fodptr - fodptr->queue->fod); | |
186 | } | |
187 | ||
188 | ||
189 | /* | |
190 | * Association and Connection IDs: | |
191 | * | |
192 | * Association ID will have random number in upper 6 bytes and zero | |
193 | * in lower 2 bytes | |
194 | * | |
195 | * Connection IDs will be Association ID with QID or'd in lower 2 bytes | |
196 | * | |
197 | * note: Association ID = Connection ID for queue 0 | |
198 | */ | |
199 | #define BYTES_FOR_QID sizeof(u16) | |
200 | #define BYTES_FOR_QID_SHIFT (BYTES_FOR_QID * 8) | |
201 | #define NVMET_FC_QUEUEID_MASK ((u64)((1 << BYTES_FOR_QID_SHIFT) - 1)) | |
202 | ||
203 | static inline u64 | |
204 | nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid) | |
205 | { | |
206 | return (assoc->association_id | qid); | |
207 | } | |
208 | ||
209 | static inline u64 | |
210 | nvmet_fc_getassociationid(u64 connectionid) | |
211 | { | |
212 | return connectionid & ~NVMET_FC_QUEUEID_MASK; | |
213 | } | |
214 | ||
215 | static inline u16 | |
216 | nvmet_fc_getqueueid(u64 connectionid) | |
217 | { | |
218 | return (u16)(connectionid & NVMET_FC_QUEUEID_MASK); | |
219 | } | |
220 | ||
221 | static inline struct nvmet_fc_tgtport * | |
222 | targetport_to_tgtport(struct nvmet_fc_target_port *targetport) | |
223 | { | |
224 | return container_of(targetport, struct nvmet_fc_tgtport, | |
225 | fc_target_port); | |
226 | } | |
227 | ||
228 | static inline struct nvmet_fc_fcp_iod * | |
229 | nvmet_req_to_fod(struct nvmet_req *nvme_req) | |
230 | { | |
231 | return container_of(nvme_req, struct nvmet_fc_fcp_iod, req); | |
232 | } | |
233 | ||
234 | ||
235 | /* *************************** Globals **************************** */ | |
236 | ||
237 | ||
238 | static DEFINE_SPINLOCK(nvmet_fc_tgtlock); | |
239 | ||
240 | static LIST_HEAD(nvmet_fc_target_list); | |
241 | static DEFINE_IDA(nvmet_fc_tgtport_cnt); | |
ea96d649 | 242 | static LIST_HEAD(nvmet_fc_portentry_list); |
c5343203 JS |
243 | |
244 | ||
245 | static void nvmet_fc_handle_ls_rqst_work(struct work_struct *work); | |
9d625f77 | 246 | static void nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work); |
c5343203 JS |
247 | static void nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc); |
248 | static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc); | |
249 | static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue); | |
250 | static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue); | |
251 | static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport); | |
710c69db DW |
252 | static void nvmet_fc_put_tgtport_work(struct work_struct *work) |
253 | { | |
254 | struct nvmet_fc_tgtport *tgtport = | |
255 | container_of(work, struct nvmet_fc_tgtport, put_work); | |
256 | ||
257 | nvmet_fc_tgtport_put(tgtport); | |
258 | } | |
c5343203 | 259 | static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport); |
0fb228d3 JS |
260 | static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, |
261 | struct nvmet_fc_fcp_iod *fod); | |
a96d4bd8 | 262 | static void nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc); |
47bf3241 JS |
263 | static void nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, |
264 | struct nvmet_fc_ls_iod *iod); | |
c5343203 JS |
265 | |
266 | ||
267 | /* *********************** FC-NVME DMA Handling **************************** */ | |
268 | ||
269 | /* | |
270 | * The fcloop device passes in a NULL device pointer. Real LLD's will | |
271 | * pass in a valid device pointer. If NULL is passed to the dma mapping | |
272 | * routines, depending on the platform, it may or may not succeed, and | |
273 | * may crash. | |
274 | * | |
275 | * As such: | |
276 | * Wrapper all the dma routines and check the dev pointer. | |
277 | * | |
278 | * If simple mappings (return just a dma address, we'll noop them, | |
279 | * returning a dma address of 0. | |
280 | * | |
281 | * On more complex mappings (dma_map_sg), a pseudo routine fills | |
282 | * in the scatter list, setting all dma addresses to 0. | |
283 | */ | |
284 | ||
285 | static inline dma_addr_t | |
286 | fc_dma_map_single(struct device *dev, void *ptr, size_t size, | |
287 | enum dma_data_direction dir) | |
288 | { | |
289 | return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; | |
290 | } | |
291 | ||
292 | static inline int | |
293 | fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) | |
294 | { | |
295 | return dev ? dma_mapping_error(dev, dma_addr) : 0; | |
296 | } | |
297 | ||
298 | static inline void | |
299 | fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, | |
300 | enum dma_data_direction dir) | |
301 | { | |
302 | if (dev) | |
303 | dma_unmap_single(dev, addr, size, dir); | |
304 | } | |
305 | ||
306 | static inline void | |
307 | fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, | |
308 | enum dma_data_direction dir) | |
309 | { | |
310 | if (dev) | |
311 | dma_sync_single_for_cpu(dev, addr, size, dir); | |
312 | } | |
313 | ||
314 | static inline void | |
315 | fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, | |
316 | enum dma_data_direction dir) | |
317 | { | |
318 | if (dev) | |
319 | dma_sync_single_for_device(dev, addr, size, dir); | |
320 | } | |
321 | ||
322 | /* pseudo dma_map_sg call */ | |
323 | static int | |
324 | fc_map_sg(struct scatterlist *sg, int nents) | |
325 | { | |
326 | struct scatterlist *s; | |
327 | int i; | |
328 | ||
329 | WARN_ON(nents == 0 || sg[0].length == 0); | |
330 | ||
331 | for_each_sg(sg, s, nents, i) { | |
332 | s->dma_address = 0L; | |
333 | #ifdef CONFIG_NEED_SG_DMA_LENGTH | |
334 | s->dma_length = s->length; | |
335 | #endif | |
336 | } | |
337 | return nents; | |
338 | } | |
339 | ||
340 | static inline int | |
341 | fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, | |
342 | enum dma_data_direction dir) | |
343 | { | |
344 | return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); | |
345 | } | |
346 | ||
347 | static inline void | |
348 | fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, | |
349 | enum dma_data_direction dir) | |
350 | { | |
351 | if (dev) | |
352 | dma_unmap_sg(dev, sg, nents, dir); | |
353 | } | |
354 | ||
355 | ||
47bf3241 JS |
356 | /* ********************** FC-NVME LS XMT Handling ************************* */ |
357 | ||
358 | ||
359 | static void | |
360 | __nvmet_fc_finish_ls_req(struct nvmet_fc_ls_req_op *lsop) | |
361 | { | |
362 | struct nvmet_fc_tgtport *tgtport = lsop->tgtport; | |
363 | struct nvmefc_ls_req *lsreq = &lsop->ls_req; | |
364 | unsigned long flags; | |
365 | ||
366 | spin_lock_irqsave(&tgtport->lock, flags); | |
367 | ||
368 | if (!lsop->req_queued) { | |
369 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
710c69db | 370 | goto out_putwork; |
47bf3241 JS |
371 | } |
372 | ||
373 | list_del(&lsop->lsreq_list); | |
374 | ||
375 | lsop->req_queued = false; | |
376 | ||
377 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
378 | ||
379 | fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma, | |
380 | (lsreq->rqstlen + lsreq->rsplen), | |
381 | DMA_BIDIRECTIONAL); | |
382 | ||
710c69db DW |
383 | out_putwork: |
384 | queue_work(nvmet_wq, &tgtport->put_work); | |
47bf3241 JS |
385 | } |
386 | ||
387 | static int | |
388 | __nvmet_fc_send_ls_req(struct nvmet_fc_tgtport *tgtport, | |
389 | struct nvmet_fc_ls_req_op *lsop, | |
390 | void (*done)(struct nvmefc_ls_req *req, int status)) | |
391 | { | |
392 | struct nvmefc_ls_req *lsreq = &lsop->ls_req; | |
393 | unsigned long flags; | |
394 | int ret = 0; | |
395 | ||
396 | if (!tgtport->ops->ls_req) | |
397 | return -EOPNOTSUPP; | |
398 | ||
399 | if (!nvmet_fc_tgtport_get(tgtport)) | |
400 | return -ESHUTDOWN; | |
401 | ||
402 | lsreq->done = done; | |
403 | lsop->req_queued = false; | |
404 | INIT_LIST_HEAD(&lsop->lsreq_list); | |
405 | ||
406 | lsreq->rqstdma = fc_dma_map_single(tgtport->dev, lsreq->rqstaddr, | |
407 | lsreq->rqstlen + lsreq->rsplen, | |
408 | DMA_BIDIRECTIONAL); | |
409 | if (fc_dma_mapping_error(tgtport->dev, lsreq->rqstdma)) { | |
410 | ret = -EFAULT; | |
411 | goto out_puttgtport; | |
412 | } | |
413 | lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen; | |
414 | ||
415 | spin_lock_irqsave(&tgtport->lock, flags); | |
416 | ||
417 | list_add_tail(&lsop->lsreq_list, &tgtport->ls_req_list); | |
418 | ||
419 | lsop->req_queued = true; | |
420 | ||
421 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
422 | ||
423 | ret = tgtport->ops->ls_req(&tgtport->fc_target_port, lsop->hosthandle, | |
424 | lsreq); | |
425 | if (ret) | |
426 | goto out_unlink; | |
427 | ||
428 | return 0; | |
429 | ||
430 | out_unlink: | |
431 | lsop->ls_error = ret; | |
432 | spin_lock_irqsave(&tgtport->lock, flags); | |
433 | lsop->req_queued = false; | |
434 | list_del(&lsop->lsreq_list); | |
435 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
436 | fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma, | |
437 | (lsreq->rqstlen + lsreq->rsplen), | |
438 | DMA_BIDIRECTIONAL); | |
439 | out_puttgtport: | |
440 | nvmet_fc_tgtport_put(tgtport); | |
441 | ||
442 | return ret; | |
443 | } | |
444 | ||
445 | static int | |
446 | nvmet_fc_send_ls_req_async(struct nvmet_fc_tgtport *tgtport, | |
447 | struct nvmet_fc_ls_req_op *lsop, | |
448 | void (*done)(struct nvmefc_ls_req *req, int status)) | |
449 | { | |
450 | /* don't wait for completion */ | |
451 | ||
452 | return __nvmet_fc_send_ls_req(tgtport, lsop, done); | |
453 | } | |
454 | ||
455 | static void | |
456 | nvmet_fc_disconnect_assoc_done(struct nvmefc_ls_req *lsreq, int status) | |
457 | { | |
458 | struct nvmet_fc_ls_req_op *lsop = | |
459 | container_of(lsreq, struct nvmet_fc_ls_req_op, ls_req); | |
460 | ||
461 | __nvmet_fc_finish_ls_req(lsop); | |
462 | ||
463 | /* fc-nvme target doesn't care about success or failure of cmd */ | |
464 | ||
465 | kfree(lsop); | |
466 | } | |
467 | ||
468 | /* | |
469 | * This routine sends a FC-NVME LS to disconnect (aka terminate) | |
470 | * the FC-NVME Association. Terminating the association also | |
471 | * terminates the FC-NVME connections (per queue, both admin and io | |
472 | * queues) that are part of the association. E.g. things are torn | |
473 | * down, and the related FC-NVME Association ID and Connection IDs | |
474 | * become invalid. | |
475 | * | |
476 | * The behavior of the fc-nvme target is such that it's | |
477 | * understanding of the association and connections will implicitly | |
478 | * be torn down. The action is implicit as it may be due to a loss of | |
479 | * connectivity with the fc-nvme host, so the target may never get a | |
480 | * response even if it tried. As such, the action of this routine | |
481 | * is to asynchronously send the LS, ignore any results of the LS, and | |
482 | * continue on with terminating the association. If the fc-nvme host | |
483 | * is present and receives the LS, it too can tear down. | |
484 | */ | |
485 | static void | |
486 | nvmet_fc_xmt_disconnect_assoc(struct nvmet_fc_tgt_assoc *assoc) | |
487 | { | |
488 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
489 | struct fcnvme_ls_disconnect_assoc_rqst *discon_rqst; | |
490 | struct fcnvme_ls_disconnect_assoc_acc *discon_acc; | |
491 | struct nvmet_fc_ls_req_op *lsop; | |
492 | struct nvmefc_ls_req *lsreq; | |
493 | int ret; | |
494 | ||
495 | /* | |
496 | * If ls_req is NULL or no hosthandle, it's an older lldd and no | |
497 | * message is normal. Otherwise, send unless the hostport has | |
498 | * already been invalidated by the lldd. | |
499 | */ | |
50b474e1 | 500 | if (!tgtport->ops->ls_req || assoc->hostport->invalid) |
47bf3241 JS |
501 | return; |
502 | ||
503 | lsop = kzalloc((sizeof(*lsop) + | |
504 | sizeof(*discon_rqst) + sizeof(*discon_acc) + | |
505 | tgtport->ops->lsrqst_priv_sz), GFP_KERNEL); | |
506 | if (!lsop) { | |
507 | dev_info(tgtport->dev, | |
508 | "{%d:%d} send Disconnect Association failed: ENOMEM\n", | |
509 | tgtport->fc_target_port.port_num, assoc->a_id); | |
510 | return; | |
511 | } | |
512 | ||
513 | discon_rqst = (struct fcnvme_ls_disconnect_assoc_rqst *)&lsop[1]; | |
514 | discon_acc = (struct fcnvme_ls_disconnect_assoc_acc *)&discon_rqst[1]; | |
515 | lsreq = &lsop->ls_req; | |
516 | if (tgtport->ops->lsrqst_priv_sz) | |
517 | lsreq->private = (void *)&discon_acc[1]; | |
518 | else | |
519 | lsreq->private = NULL; | |
520 | ||
521 | lsop->tgtport = tgtport; | |
522 | lsop->hosthandle = assoc->hostport->hosthandle; | |
523 | ||
524 | nvmefc_fmt_lsreq_discon_assoc(lsreq, discon_rqst, discon_acc, | |
525 | assoc->association_id); | |
526 | ||
527 | ret = nvmet_fc_send_ls_req_async(tgtport, lsop, | |
528 | nvmet_fc_disconnect_assoc_done); | |
529 | if (ret) { | |
530 | dev_info(tgtport->dev, | |
531 | "{%d:%d} XMT Disconnect Association failed: %d\n", | |
532 | tgtport->fc_target_port.port_num, assoc->a_id, ret); | |
533 | kfree(lsop); | |
534 | } | |
535 | } | |
536 | ||
537 | ||
c5343203 JS |
538 | /* *********************** FC-NVME Port Management ************************ */ |
539 | ||
540 | ||
541 | static int | |
542 | nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport) | |
543 | { | |
544 | struct nvmet_fc_ls_iod *iod; | |
545 | int i; | |
546 | ||
547 | iod = kcalloc(NVMET_LS_CTX_COUNT, sizeof(struct nvmet_fc_ls_iod), | |
548 | GFP_KERNEL); | |
549 | if (!iod) | |
550 | return -ENOMEM; | |
551 | ||
552 | tgtport->iod = iod; | |
553 | ||
554 | for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { | |
555 | INIT_WORK(&iod->work, nvmet_fc_handle_ls_rqst_work); | |
556 | iod->tgtport = tgtport; | |
349c694e | 557 | list_add_tail(&iod->ls_rcv_list, &tgtport->ls_rcv_list); |
c5343203 | 558 | |
3b8281b0 JS |
559 | iod->rqstbuf = kzalloc(sizeof(union nvmefc_ls_requests) + |
560 | sizeof(union nvmefc_ls_responses), | |
561 | GFP_KERNEL); | |
c5343203 JS |
562 | if (!iod->rqstbuf) |
563 | goto out_fail; | |
564 | ||
3b8281b0 | 565 | iod->rspbuf = (union nvmefc_ls_responses *)&iod->rqstbuf[1]; |
c5343203 JS |
566 | |
567 | iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf, | |
3b8281b0 | 568 | sizeof(*iod->rspbuf), |
c5343203 JS |
569 | DMA_TO_DEVICE); |
570 | if (fc_dma_mapping_error(tgtport->dev, iod->rspdma)) | |
571 | goto out_fail; | |
572 | } | |
573 | ||
574 | return 0; | |
575 | ||
576 | out_fail: | |
577 | kfree(iod->rqstbuf); | |
349c694e | 578 | list_del(&iod->ls_rcv_list); |
c5343203 JS |
579 | for (iod--, i--; i >= 0; iod--, i--) { |
580 | fc_dma_unmap_single(tgtport->dev, iod->rspdma, | |
3b8281b0 | 581 | sizeof(*iod->rspbuf), DMA_TO_DEVICE); |
c5343203 | 582 | kfree(iod->rqstbuf); |
349c694e | 583 | list_del(&iod->ls_rcv_list); |
c5343203 JS |
584 | } |
585 | ||
586 | kfree(iod); | |
587 | ||
588 | return -EFAULT; | |
589 | } | |
590 | ||
591 | static void | |
592 | nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport) | |
593 | { | |
594 | struct nvmet_fc_ls_iod *iod = tgtport->iod; | |
595 | int i; | |
596 | ||
597 | for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { | |
598 | fc_dma_unmap_single(tgtport->dev, | |
3b8281b0 | 599 | iod->rspdma, sizeof(*iod->rspbuf), |
c5343203 JS |
600 | DMA_TO_DEVICE); |
601 | kfree(iod->rqstbuf); | |
349c694e | 602 | list_del(&iod->ls_rcv_list); |
c5343203 JS |
603 | } |
604 | kfree(tgtport->iod); | |
605 | } | |
606 | ||
607 | static struct nvmet_fc_ls_iod * | |
608 | nvmet_fc_alloc_ls_iod(struct nvmet_fc_tgtport *tgtport) | |
609 | { | |
369157b4 | 610 | struct nvmet_fc_ls_iod *iod; |
c5343203 JS |
611 | unsigned long flags; |
612 | ||
613 | spin_lock_irqsave(&tgtport->lock, flags); | |
349c694e JS |
614 | iod = list_first_entry_or_null(&tgtport->ls_rcv_list, |
615 | struct nvmet_fc_ls_iod, ls_rcv_list); | |
c5343203 | 616 | if (iod) |
349c694e | 617 | list_move_tail(&iod->ls_rcv_list, &tgtport->ls_busylist); |
c5343203 JS |
618 | spin_unlock_irqrestore(&tgtport->lock, flags); |
619 | return iod; | |
620 | } | |
621 | ||
622 | ||
623 | static void | |
624 | nvmet_fc_free_ls_iod(struct nvmet_fc_tgtport *tgtport, | |
625 | struct nvmet_fc_ls_iod *iod) | |
626 | { | |
627 | unsigned long flags; | |
628 | ||
629 | spin_lock_irqsave(&tgtport->lock, flags); | |
349c694e | 630 | list_move(&iod->ls_rcv_list, &tgtport->ls_rcv_list); |
c5343203 JS |
631 | spin_unlock_irqrestore(&tgtport->lock, flags); |
632 | } | |
633 | ||
634 | static void | |
635 | nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, | |
636 | struct nvmet_fc_tgt_queue *queue) | |
637 | { | |
638 | struct nvmet_fc_fcp_iod *fod = queue->fod; | |
639 | int i; | |
640 | ||
641 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
9d625f77 | 642 | INIT_WORK(&fod->defer_work, nvmet_fc_fcp_rqst_op_defer_work); |
c5343203 JS |
643 | fod->tgtport = tgtport; |
644 | fod->queue = queue; | |
645 | fod->active = false; | |
a97ec51b JS |
646 | fod->abort = false; |
647 | fod->aborted = false; | |
648 | fod->fcpreq = NULL; | |
c5343203 JS |
649 | list_add_tail(&fod->fcp_list, &queue->fod_list); |
650 | spin_lock_init(&fod->flock); | |
651 | ||
652 | fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf, | |
653 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
654 | if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) { | |
655 | list_del(&fod->fcp_list); | |
656 | for (fod--, i--; i >= 0; fod--, i--) { | |
657 | fc_dma_unmap_single(tgtport->dev, fod->rspdma, | |
658 | sizeof(fod->rspiubuf), | |
659 | DMA_TO_DEVICE); | |
660 | fod->rspdma = 0L; | |
661 | list_del(&fod->fcp_list); | |
662 | } | |
663 | ||
664 | return; | |
665 | } | |
666 | } | |
667 | } | |
668 | ||
669 | static void | |
670 | nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, | |
671 | struct nvmet_fc_tgt_queue *queue) | |
672 | { | |
673 | struct nvmet_fc_fcp_iod *fod = queue->fod; | |
674 | int i; | |
675 | ||
676 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
677 | if (fod->rspdma) | |
678 | fc_dma_unmap_single(tgtport->dev, fod->rspdma, | |
679 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
680 | } | |
681 | } | |
682 | ||
683 | static struct nvmet_fc_fcp_iod * | |
684 | nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue) | |
685 | { | |
369157b4 | 686 | struct nvmet_fc_fcp_iod *fod; |
c5343203 | 687 | |
0fb228d3 JS |
688 | lockdep_assert_held(&queue->qlock); |
689 | ||
c5343203 JS |
690 | fod = list_first_entry_or_null(&queue->fod_list, |
691 | struct nvmet_fc_fcp_iod, fcp_list); | |
692 | if (fod) { | |
693 | list_del(&fod->fcp_list); | |
694 | fod->active = true; | |
c5343203 JS |
695 | /* |
696 | * no queue reference is taken, as it was taken by the | |
697 | * queue lookup just prior to the allocation. The iod | |
698 | * will "inherit" that reference. | |
699 | */ | |
700 | } | |
c5343203 JS |
701 | return fod; |
702 | } | |
703 | ||
704 | ||
0fb228d3 JS |
705 | static void |
706 | nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport, | |
707 | struct nvmet_fc_tgt_queue *queue, | |
708 | struct nvmefc_tgt_fcp_req *fcpreq) | |
709 | { | |
710 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
711 | ||
712 | /* | |
713 | * put all admin cmds on hw queue id 0. All io commands go to | |
714 | * the respective hw queue based on a modulo basis | |
715 | */ | |
716 | fcpreq->hwqid = queue->qid ? | |
717 | ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0; | |
718 | ||
6e2e312e | 719 | nvmet_fc_handle_fcp_rqst(tgtport, fod); |
0fb228d3 JS |
720 | } |
721 | ||
9d625f77 JS |
722 | static void |
723 | nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work) | |
724 | { | |
725 | struct nvmet_fc_fcp_iod *fod = | |
726 | container_of(work, struct nvmet_fc_fcp_iod, defer_work); | |
727 | ||
728 | /* Submit deferred IO for processing */ | |
729 | nvmet_fc_queue_fcp_req(fod->tgtport, fod->queue, fod->fcpreq); | |
730 | ||
731 | } | |
732 | ||
c5343203 JS |
733 | static void |
734 | nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue, | |
735 | struct nvmet_fc_fcp_iod *fod) | |
736 | { | |
19b58d94 JS |
737 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; |
738 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
0fb228d3 | 739 | struct nvmet_fc_defer_fcp_req *deferfcp; |
c5343203 JS |
740 | unsigned long flags; |
741 | ||
a97ec51b JS |
742 | fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma, |
743 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
744 | ||
745 | fcpreq->nvmet_fc_private = NULL; | |
746 | ||
c5343203 | 747 | fod->active = false; |
a97ec51b JS |
748 | fod->abort = false; |
749 | fod->aborted = false; | |
750 | fod->writedataactive = false; | |
751 | fod->fcpreq = NULL; | |
0fb228d3 JS |
752 | |
753 | tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq); | |
754 | ||
619c62dc JS |
755 | /* release the queue lookup reference on the completed IO */ |
756 | nvmet_fc_tgt_q_put(queue); | |
757 | ||
0fb228d3 JS |
758 | spin_lock_irqsave(&queue->qlock, flags); |
759 | deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, | |
760 | struct nvmet_fc_defer_fcp_req, req_list); | |
761 | if (!deferfcp) { | |
762 | list_add_tail(&fod->fcp_list, &fod->queue->fod_list); | |
763 | spin_unlock_irqrestore(&queue->qlock, flags); | |
0fb228d3 JS |
764 | return; |
765 | } | |
766 | ||
767 | /* Re-use the fod for the next pending cmd that was deferred */ | |
768 | list_del(&deferfcp->req_list); | |
769 | ||
770 | fcpreq = deferfcp->fcp_req; | |
771 | ||
772 | /* deferfcp can be reused for another IO at a later date */ | |
773 | list_add_tail(&deferfcp->req_list, &queue->avail_defer_list); | |
774 | ||
c5343203 JS |
775 | spin_unlock_irqrestore(&queue->qlock, flags); |
776 | ||
0fb228d3 JS |
777 | /* Save NVME CMD IO in fod */ |
778 | memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen); | |
779 | ||
780 | /* Setup new fcpreq to be processed */ | |
781 | fcpreq->rspaddr = NULL; | |
782 | fcpreq->rsplen = 0; | |
783 | fcpreq->nvmet_fc_private = fod; | |
784 | fod->fcpreq = fcpreq; | |
785 | fod->active = true; | |
786 | ||
787 | /* inform LLDD IO is now being processed */ | |
788 | tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq); | |
789 | ||
c5343203 | 790 | /* |
0fb228d3 JS |
791 | * Leave the queue lookup get reference taken when |
792 | * fod was originally allocated. | |
c5343203 | 793 | */ |
9d625f77 JS |
794 | |
795 | queue_work(queue->work_q, &fod->defer_work); | |
c5343203 JS |
796 | } |
797 | ||
c5343203 JS |
798 | static struct nvmet_fc_tgt_queue * |
799 | nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc, | |
800 | u16 qid, u16 sqsize) | |
801 | { | |
802 | struct nvmet_fc_tgt_queue *queue; | |
c5343203 JS |
803 | int ret; |
804 | ||
deb61742 | 805 | if (qid > NVMET_NR_QUEUES) |
c5343203 JS |
806 | return NULL; |
807 | ||
6b80f1d2 | 808 | queue = kzalloc(struct_size(queue, fod, sqsize), GFP_KERNEL); |
c5343203 JS |
809 | if (!queue) |
810 | return NULL; | |
811 | ||
c5343203 JS |
812 | queue->work_q = alloc_workqueue("ntfc%d.%d.%d", 0, 0, |
813 | assoc->tgtport->fc_target_port.port_num, | |
814 | assoc->a_id, qid); | |
815 | if (!queue->work_q) | |
4049dc96 | 816 | goto out_free_queue; |
c5343203 | 817 | |
c5343203 JS |
818 | queue->qid = qid; |
819 | queue->sqsize = sqsize; | |
820 | queue->assoc = assoc; | |
c5343203 | 821 | INIT_LIST_HEAD(&queue->fod_list); |
0fb228d3 JS |
822 | INIT_LIST_HEAD(&queue->avail_defer_list); |
823 | INIT_LIST_HEAD(&queue->pending_cmd_list); | |
c5343203 JS |
824 | atomic_set(&queue->connected, 0); |
825 | atomic_set(&queue->sqtail, 0); | |
826 | atomic_set(&queue->rsn, 1); | |
827 | atomic_set(&queue->zrspcnt, 0); | |
828 | spin_lock_init(&queue->qlock); | |
829 | kref_init(&queue->ref); | |
830 | ||
831 | nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue); | |
832 | ||
833 | ret = nvmet_sq_init(&queue->nvme_sq); | |
834 | if (ret) | |
835 | goto out_fail_iodlist; | |
836 | ||
837 | WARN_ON(assoc->queues[qid]); | |
4049dc96 | 838 | assoc->queues[qid] = queue; |
c5343203 JS |
839 | |
840 | return queue; | |
841 | ||
842 | out_fail_iodlist: | |
843 | nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue); | |
844 | destroy_workqueue(queue->work_q); | |
c5343203 JS |
845 | out_free_queue: |
846 | kfree(queue); | |
847 | return NULL; | |
848 | } | |
849 | ||
850 | ||
851 | static void | |
852 | nvmet_fc_tgt_queue_free(struct kref *ref) | |
853 | { | |
854 | struct nvmet_fc_tgt_queue *queue = | |
855 | container_of(ref, struct nvmet_fc_tgt_queue, ref); | |
c5343203 | 856 | |
c5343203 JS |
857 | nvmet_fc_destroy_fcp_iodlist(queue->assoc->tgtport, queue); |
858 | ||
c5343203 JS |
859 | destroy_workqueue(queue->work_q); |
860 | ||
c5e27b1a | 861 | kfree(queue); |
c5343203 JS |
862 | } |
863 | ||
864 | static void | |
865 | nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue) | |
866 | { | |
867 | kref_put(&queue->ref, nvmet_fc_tgt_queue_free); | |
868 | } | |
869 | ||
870 | static int | |
871 | nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue) | |
872 | { | |
873 | return kref_get_unless_zero(&queue->ref); | |
874 | } | |
875 | ||
876 | ||
c5343203 JS |
877 | static void |
878 | nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue) | |
879 | { | |
a97ec51b | 880 | struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport; |
c5343203 | 881 | struct nvmet_fc_fcp_iod *fod = queue->fod; |
16a5a480 | 882 | struct nvmet_fc_defer_fcp_req *deferfcp, *tempptr; |
c5343203 | 883 | unsigned long flags; |
0dfb992e | 884 | int i; |
c5343203 JS |
885 | bool disconnect; |
886 | ||
887 | disconnect = atomic_xchg(&queue->connected, 0); | |
888 | ||
47bf3241 JS |
889 | /* if not connected, nothing to do */ |
890 | if (!disconnect) | |
891 | return; | |
892 | ||
c5343203 | 893 | spin_lock_irqsave(&queue->qlock, flags); |
d038dd81 | 894 | /* abort outstanding io's */ |
c5343203 JS |
895 | for (i = 0; i < queue->sqsize; fod++, i++) { |
896 | if (fod->active) { | |
897 | spin_lock(&fod->flock); | |
898 | fod->abort = true; | |
a97ec51b JS |
899 | /* |
900 | * only call lldd abort routine if waiting for | |
901 | * writedata. other outstanding ops should finish | |
902 | * on their own. | |
903 | */ | |
0dfb992e | 904 | if (fod->writedataactive) { |
a97ec51b JS |
905 | fod->aborted = true; |
906 | spin_unlock(&fod->flock); | |
907 | tgtport->ops->fcp_abort( | |
908 | &tgtport->fc_target_port, fod->fcpreq); | |
0dfb992e JS |
909 | } else |
910 | spin_unlock(&fod->flock); | |
c5343203 JS |
911 | } |
912 | } | |
0fb228d3 JS |
913 | |
914 | /* Cleanup defer'ed IOs in queue */ | |
16a5a480 JS |
915 | list_for_each_entry_safe(deferfcp, tempptr, &queue->avail_defer_list, |
916 | req_list) { | |
0fb228d3 JS |
917 | list_del(&deferfcp->req_list); |
918 | kfree(deferfcp); | |
919 | } | |
920 | ||
921 | for (;;) { | |
922 | deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, | |
923 | struct nvmet_fc_defer_fcp_req, req_list); | |
924 | if (!deferfcp) | |
925 | break; | |
926 | ||
927 | list_del(&deferfcp->req_list); | |
928 | spin_unlock_irqrestore(&queue->qlock, flags); | |
929 | ||
930 | tgtport->ops->defer_rcv(&tgtport->fc_target_port, | |
931 | deferfcp->fcp_req); | |
932 | ||
933 | tgtport->ops->fcp_abort(&tgtport->fc_target_port, | |
934 | deferfcp->fcp_req); | |
935 | ||
936 | tgtport->ops->fcp_req_release(&tgtport->fc_target_port, | |
937 | deferfcp->fcp_req); | |
938 | ||
619c62dc JS |
939 | /* release the queue lookup reference */ |
940 | nvmet_fc_tgt_q_put(queue); | |
941 | ||
0fb228d3 JS |
942 | kfree(deferfcp); |
943 | ||
944 | spin_lock_irqsave(&queue->qlock, flags); | |
945 | } | |
c5343203 JS |
946 | spin_unlock_irqrestore(&queue->qlock, flags); |
947 | ||
948 | flush_workqueue(queue->work_q); | |
949 | ||
0dfb992e | 950 | nvmet_sq_destroy(&queue->nvme_sq); |
c5343203 JS |
951 | |
952 | nvmet_fc_tgt_q_put(queue); | |
953 | } | |
954 | ||
955 | static struct nvmet_fc_tgt_queue * | |
956 | nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport, | |
957 | u64 connection_id) | |
958 | { | |
959 | struct nvmet_fc_tgt_assoc *assoc; | |
960 | struct nvmet_fc_tgt_queue *queue; | |
961 | u64 association_id = nvmet_fc_getassociationid(connection_id); | |
962 | u16 qid = nvmet_fc_getqueueid(connection_id); | |
c5343203 | 963 | |
0c319d3a JS |
964 | if (qid > NVMET_NR_QUEUES) |
965 | return NULL; | |
966 | ||
4e2f02bf LR |
967 | rcu_read_lock(); |
968 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
c5343203 | 969 | if (association_id == assoc->association_id) { |
4049dc96 | 970 | queue = assoc->queues[qid]; |
c5343203 JS |
971 | if (queue && |
972 | (!atomic_read(&queue->connected) || | |
973 | !nvmet_fc_tgt_q_get(queue))) | |
974 | queue = NULL; | |
4e2f02bf | 975 | rcu_read_unlock(); |
c5343203 JS |
976 | return queue; |
977 | } | |
978 | } | |
4e2f02bf | 979 | rcu_read_unlock(); |
c5343203 JS |
980 | return NULL; |
981 | } | |
982 | ||
58ab8ff9 JS |
983 | static void |
984 | nvmet_fc_hostport_free(struct kref *ref) | |
985 | { | |
986 | struct nvmet_fc_hostport *hostport = | |
987 | container_of(ref, struct nvmet_fc_hostport, ref); | |
988 | struct nvmet_fc_tgtport *tgtport = hostport->tgtport; | |
989 | unsigned long flags; | |
990 | ||
991 | spin_lock_irqsave(&tgtport->lock, flags); | |
992 | list_del(&hostport->host_list); | |
993 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
994 | if (tgtport->ops->host_release && hostport->invalid) | |
995 | tgtport->ops->host_release(hostport->hosthandle); | |
996 | kfree(hostport); | |
997 | nvmet_fc_tgtport_put(tgtport); | |
998 | } | |
999 | ||
1000 | static void | |
1001 | nvmet_fc_hostport_put(struct nvmet_fc_hostport *hostport) | |
1002 | { | |
1003 | kref_put(&hostport->ref, nvmet_fc_hostport_free); | |
1004 | } | |
1005 | ||
1006 | static int | |
1007 | nvmet_fc_hostport_get(struct nvmet_fc_hostport *hostport) | |
1008 | { | |
1009 | return kref_get_unless_zero(&hostport->ref); | |
1010 | } | |
1011 | ||
1012 | static void | |
1013 | nvmet_fc_free_hostport(struct nvmet_fc_hostport *hostport) | |
1014 | { | |
1015 | /* if LLDD not implemented, leave as NULL */ | |
ddd3d105 | 1016 | if (!hostport || !hostport->hosthandle) |
58ab8ff9 JS |
1017 | return; |
1018 | ||
1019 | nvmet_fc_hostport_put(hostport); | |
1020 | } | |
1021 | ||
0d8ddeea AE |
1022 | static struct nvmet_fc_hostport * |
1023 | nvmet_fc_match_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle) | |
1024 | { | |
1025 | struct nvmet_fc_hostport *host; | |
1026 | ||
1027 | lockdep_assert_held(&tgtport->lock); | |
1028 | ||
1029 | list_for_each_entry(host, &tgtport->host_list, host_list) { | |
1030 | if (host->hosthandle == hosthandle && !host->invalid) { | |
1031 | if (nvmet_fc_hostport_get(host)) | |
72e8c937 | 1032 | return host; |
0d8ddeea AE |
1033 | } |
1034 | } | |
1035 | ||
1036 | return NULL; | |
1037 | } | |
1038 | ||
58ab8ff9 JS |
1039 | static struct nvmet_fc_hostport * |
1040 | nvmet_fc_alloc_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle) | |
1041 | { | |
0d8ddeea | 1042 | struct nvmet_fc_hostport *newhost, *match = NULL; |
58ab8ff9 JS |
1043 | unsigned long flags; |
1044 | ||
1045 | /* if LLDD not implemented, leave as NULL */ | |
1046 | if (!hosthandle) | |
1047 | return NULL; | |
1048 | ||
0d8ddeea AE |
1049 | /* |
1050 | * take reference for what will be the newly allocated hostport if | |
1051 | * we end up using a new allocation | |
1052 | */ | |
58ab8ff9 JS |
1053 | if (!nvmet_fc_tgtport_get(tgtport)) |
1054 | return ERR_PTR(-EINVAL); | |
1055 | ||
0d8ddeea AE |
1056 | spin_lock_irqsave(&tgtport->lock, flags); |
1057 | match = nvmet_fc_match_hostport(tgtport, hosthandle); | |
1058 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1059 | ||
1060 | if (match) { | |
1061 | /* no new allocation - release reference */ | |
1062 | nvmet_fc_tgtport_put(tgtport); | |
1063 | return match; | |
1064 | } | |
1065 | ||
58ab8ff9 JS |
1066 | newhost = kzalloc(sizeof(*newhost), GFP_KERNEL); |
1067 | if (!newhost) { | |
0d8ddeea | 1068 | /* no new allocation - release reference */ |
58ab8ff9 | 1069 | nvmet_fc_tgtport_put(tgtport); |
0d8ddeea | 1070 | return ERR_PTR(-ENOMEM); |
58ab8ff9 JS |
1071 | } |
1072 | ||
58ab8ff9 | 1073 | spin_lock_irqsave(&tgtport->lock, flags); |
0d8ddeea | 1074 | match = nvmet_fc_match_hostport(tgtport, hosthandle); |
58ab8ff9 | 1075 | if (match) { |
0d8ddeea | 1076 | /* new allocation not needed */ |
58ab8ff9 | 1077 | kfree(newhost); |
0d8ddeea | 1078 | newhost = match; |
0d8ddeea AE |
1079 | } else { |
1080 | newhost->tgtport = tgtport; | |
1081 | newhost->hosthandle = hosthandle; | |
1082 | INIT_LIST_HEAD(&newhost->host_list); | |
1083 | kref_init(&newhost->ref); | |
1084 | ||
58ab8ff9 | 1085 | list_add_tail(&newhost->host_list, &tgtport->host_list); |
0d8ddeea | 1086 | } |
58ab8ff9 JS |
1087 | spin_unlock_irqrestore(&tgtport->lock, flags); |
1088 | ||
0d8ddeea | 1089 | return newhost; |
58ab8ff9 JS |
1090 | } |
1091 | ||
a96d4bd8 | 1092 | static void |
fe506a74 DW |
1093 | nvmet_fc_delete_assoc(struct nvmet_fc_tgt_assoc *assoc) |
1094 | { | |
1095 | nvmet_fc_delete_target_assoc(assoc); | |
1096 | nvmet_fc_tgt_a_put(assoc); | |
1097 | } | |
1098 | ||
1099 | static void | |
1100 | nvmet_fc_delete_assoc_work(struct work_struct *work) | |
a96d4bd8 JS |
1101 | { |
1102 | struct nvmet_fc_tgt_assoc *assoc = | |
1103 | container_of(work, struct nvmet_fc_tgt_assoc, del_work); | |
fe506a74 | 1104 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; |
a96d4bd8 | 1105 | |
fe506a74 DW |
1106 | nvmet_fc_delete_assoc(assoc); |
1107 | nvmet_fc_tgtport_put(tgtport); | |
1108 | } | |
1109 | ||
1110 | static void | |
1111 | nvmet_fc_schedule_delete_assoc(struct nvmet_fc_tgt_assoc *assoc) | |
1112 | { | |
1113 | nvmet_fc_tgtport_get(assoc->tgtport); | |
1114 | queue_work(nvmet_wq, &assoc->del_work); | |
a96d4bd8 JS |
1115 | } |
1116 | ||
a90ac7b3 | 1117 | static bool |
db67bb39 | 1118 | nvmet_fc_assoc_exists(struct nvmet_fc_tgtport *tgtport, u64 association_id) |
a90ac7b3 DW |
1119 | { |
1120 | struct nvmet_fc_tgt_assoc *a; | |
db67bb39 | 1121 | bool found = false; |
a90ac7b3 | 1122 | |
db67bb39 | 1123 | rcu_read_lock(); |
a90ac7b3 | 1124 | list_for_each_entry_rcu(a, &tgtport->assoc_list, a_list) { |
db67bb39 DW |
1125 | if (association_id == a->association_id) { |
1126 | found = true; | |
1127 | break; | |
1128 | } | |
a90ac7b3 | 1129 | } |
db67bb39 | 1130 | rcu_read_unlock(); |
a90ac7b3 | 1131 | |
db67bb39 | 1132 | return found; |
a90ac7b3 DW |
1133 | } |
1134 | ||
c5343203 | 1135 | static struct nvmet_fc_tgt_assoc * |
58ab8ff9 | 1136 | nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport, void *hosthandle) |
c5343203 | 1137 | { |
a90ac7b3 | 1138 | struct nvmet_fc_tgt_assoc *assoc; |
c5343203 | 1139 | unsigned long flags; |
a90ac7b3 | 1140 | bool done; |
c5343203 JS |
1141 | u64 ran; |
1142 | int idx; | |
c5343203 | 1143 | |
3146345c DW |
1144 | if (!tgtport->pe) |
1145 | return NULL; | |
1146 | ||
c5343203 JS |
1147 | assoc = kzalloc(sizeof(*assoc), GFP_KERNEL); |
1148 | if (!assoc) | |
1149 | return NULL; | |
1150 | ||
6dd0f465 | 1151 | idx = ida_alloc(&tgtport->assoc_cnt, GFP_KERNEL); |
c5343203 JS |
1152 | if (idx < 0) |
1153 | goto out_free_assoc; | |
1154 | ||
58ab8ff9 JS |
1155 | assoc->hostport = nvmet_fc_alloc_hostport(tgtport, hosthandle); |
1156 | if (IS_ERR(assoc->hostport)) | |
1c110588 | 1157 | goto out_ida; |
c5343203 JS |
1158 | |
1159 | assoc->tgtport = tgtport; | |
1160 | assoc->a_id = idx; | |
1161 | INIT_LIST_HEAD(&assoc->a_list); | |
1162 | kref_init(&assoc->ref); | |
fe506a74 | 1163 | INIT_WORK(&assoc->del_work, nvmet_fc_delete_assoc_work); |
47bf3241 | 1164 | atomic_set(&assoc->terminating, 0); |
c5343203 | 1165 | |
a90ac7b3 DW |
1166 | done = false; |
1167 | do { | |
c5343203 JS |
1168 | get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID); |
1169 | ran = ran << BYTES_FOR_QID_SHIFT; | |
1170 | ||
1171 | spin_lock_irqsave(&tgtport->lock, flags); | |
db67bb39 | 1172 | if (!nvmet_fc_assoc_exists(tgtport, ran)) { |
c5343203 | 1173 | assoc->association_id = ran; |
4e2f02bf | 1174 | list_add_tail_rcu(&assoc->a_list, &tgtport->assoc_list); |
a90ac7b3 | 1175 | done = true; |
c5343203 JS |
1176 | } |
1177 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
a90ac7b3 | 1178 | } while (!done); |
c5343203 JS |
1179 | |
1180 | return assoc; | |
1181 | ||
58ab8ff9 | 1182 | out_ida: |
6dd0f465 | 1183 | ida_free(&tgtport->assoc_cnt, idx); |
c5343203 JS |
1184 | out_free_assoc: |
1185 | kfree(assoc); | |
1186 | return NULL; | |
1187 | } | |
1188 | ||
1189 | static void | |
1190 | nvmet_fc_target_assoc_free(struct kref *ref) | |
1191 | { | |
1192 | struct nvmet_fc_tgt_assoc *assoc = | |
1193 | container_of(ref, struct nvmet_fc_tgt_assoc, ref); | |
1194 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
47bf3241 | 1195 | struct nvmet_fc_ls_iod *oldls; |
c5343203 | 1196 | unsigned long flags; |
4049dc96 DW |
1197 | int i; |
1198 | ||
1199 | for (i = NVMET_NR_QUEUES; i >= 0; i--) { | |
1200 | if (assoc->queues[i]) | |
1201 | nvmet_fc_delete_target_queue(assoc->queues[i]); | |
1202 | } | |
c5343203 | 1203 | |
47bf3241 JS |
1204 | /* Send Disconnect now that all i/o has completed */ |
1205 | nvmet_fc_xmt_disconnect_assoc(assoc); | |
1206 | ||
58ab8ff9 | 1207 | nvmet_fc_free_hostport(assoc->hostport); |
c5343203 | 1208 | spin_lock_irqsave(&tgtport->lock, flags); |
47bf3241 | 1209 | oldls = assoc->rcv_disconn; |
c5343203 | 1210 | spin_unlock_irqrestore(&tgtport->lock, flags); |
47bf3241 JS |
1211 | /* if pending Rcv Disconnect Association LS, send rsp now */ |
1212 | if (oldls) | |
1213 | nvmet_fc_xmt_ls_rsp(tgtport, oldls); | |
6dd0f465 | 1214 | ida_free(&tgtport->assoc_cnt, assoc->a_id); |
47bf3241 JS |
1215 | dev_info(tgtport->dev, |
1216 | "{%d:%d} Association freed\n", | |
1217 | tgtport->fc_target_port.port_num, assoc->a_id); | |
c5e27b1a | 1218 | kfree(assoc); |
c5343203 JS |
1219 | } |
1220 | ||
1221 | static void | |
1222 | nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc) | |
1223 | { | |
1224 | kref_put(&assoc->ref, nvmet_fc_target_assoc_free); | |
1225 | } | |
1226 | ||
1227 | static int | |
1228 | nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc) | |
1229 | { | |
1230 | return kref_get_unless_zero(&assoc->ref); | |
1231 | } | |
1232 | ||
1233 | static void | |
1234 | nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc) | |
1235 | { | |
1236 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
4049dc96 | 1237 | unsigned long flags; |
47bf3241 JS |
1238 | int i, terminating; |
1239 | ||
1240 | terminating = atomic_xchg(&assoc->terminating, 1); | |
1241 | ||
1242 | /* if already terminating, do nothing */ | |
1243 | if (terminating) | |
1244 | return; | |
c5343203 | 1245 | |
4049dc96 DW |
1246 | spin_lock_irqsave(&tgtport->lock, flags); |
1247 | list_del_rcu(&assoc->a_list); | |
1248 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
4e2f02bf | 1249 | |
4049dc96 | 1250 | synchronize_rcu(); |
4e2f02bf | 1251 | |
4049dc96 DW |
1252 | /* ensure all in-flight I/Os have been processed */ |
1253 | for (i = NVMET_NR_QUEUES; i >= 0; i--) { | |
1254 | if (assoc->queues[i]) | |
1255 | flush_workqueue(assoc->queues[i]->work_q); | |
c5343203 | 1256 | } |
c5343203 | 1257 | |
47bf3241 JS |
1258 | dev_info(tgtport->dev, |
1259 | "{%d:%d} Association deleted\n", | |
1260 | tgtport->fc_target_port.port_num, assoc->a_id); | |
c5343203 JS |
1261 | } |
1262 | ||
1263 | static struct nvmet_fc_tgt_assoc * | |
1264 | nvmet_fc_find_target_assoc(struct nvmet_fc_tgtport *tgtport, | |
1265 | u64 association_id) | |
1266 | { | |
1267 | struct nvmet_fc_tgt_assoc *assoc; | |
1268 | struct nvmet_fc_tgt_assoc *ret = NULL; | |
c5343203 | 1269 | |
4e2f02bf LR |
1270 | rcu_read_lock(); |
1271 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
c5343203 JS |
1272 | if (association_id == assoc->association_id) { |
1273 | ret = assoc; | |
34efa232 JS |
1274 | if (!nvmet_fc_tgt_a_get(assoc)) |
1275 | ret = NULL; | |
c5343203 JS |
1276 | break; |
1277 | } | |
1278 | } | |
4e2f02bf | 1279 | rcu_read_unlock(); |
c5343203 JS |
1280 | |
1281 | return ret; | |
1282 | } | |
1283 | ||
ea96d649 JS |
1284 | static void |
1285 | nvmet_fc_portentry_bind(struct nvmet_fc_tgtport *tgtport, | |
1286 | struct nvmet_fc_port_entry *pe, | |
1287 | struct nvmet_port *port) | |
1288 | { | |
1289 | lockdep_assert_held(&nvmet_fc_tgtlock); | |
1290 | ||
1291 | pe->tgtport = tgtport; | |
1292 | tgtport->pe = pe; | |
1293 | ||
1294 | pe->port = port; | |
1295 | port->priv = pe; | |
1296 | ||
1297 | pe->node_name = tgtport->fc_target_port.node_name; | |
1298 | pe->port_name = tgtport->fc_target_port.port_name; | |
1299 | INIT_LIST_HEAD(&pe->pe_list); | |
1300 | ||
1301 | list_add_tail(&pe->pe_list, &nvmet_fc_portentry_list); | |
1302 | } | |
1303 | ||
1304 | static void | |
1305 | nvmet_fc_portentry_unbind(struct nvmet_fc_port_entry *pe) | |
1306 | { | |
1307 | unsigned long flags; | |
1308 | ||
1309 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1310 | if (pe->tgtport) | |
1311 | pe->tgtport->pe = NULL; | |
1312 | list_del(&pe->pe_list); | |
1313 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * called when a targetport deregisters. Breaks the relationship | |
1318 | * with the nvmet port, but leaves the port_entry in place so that | |
1319 | * re-registration can resume operation. | |
1320 | */ | |
1321 | static void | |
1322 | nvmet_fc_portentry_unbind_tgt(struct nvmet_fc_tgtport *tgtport) | |
1323 | { | |
1324 | struct nvmet_fc_port_entry *pe; | |
1325 | unsigned long flags; | |
1326 | ||
1327 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1328 | pe = tgtport->pe; | |
1329 | if (pe) | |
1330 | pe->tgtport = NULL; | |
1331 | tgtport->pe = NULL; | |
1332 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * called when a new targetport is registered. Looks in the | |
1337 | * existing nvmet port_entries to see if the nvmet layer is | |
1338 | * configured for the targetport's wwn's. (the targetport existed, | |
1339 | * nvmet configured, the lldd unregistered the tgtport, and is now | |
1340 | * reregistering the same targetport). If so, set the nvmet port | |
1341 | * port entry on the targetport. | |
1342 | */ | |
1343 | static void | |
1344 | nvmet_fc_portentry_rebind_tgt(struct nvmet_fc_tgtport *tgtport) | |
1345 | { | |
1346 | struct nvmet_fc_port_entry *pe; | |
1347 | unsigned long flags; | |
1348 | ||
1349 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1350 | list_for_each_entry(pe, &nvmet_fc_portentry_list, pe_list) { | |
1351 | if (tgtport->fc_target_port.node_name == pe->node_name && | |
1352 | tgtport->fc_target_port.port_name == pe->port_name) { | |
1353 | WARN_ON(pe->tgtport); | |
1354 | tgtport->pe = pe; | |
1355 | pe->tgtport = tgtport; | |
1356 | break; | |
1357 | } | |
1358 | } | |
1359 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1360 | } | |
c5343203 JS |
1361 | |
1362 | /** | |
b2fb99e4 | 1363 | * nvmet_fc_register_targetport - transport entry point called by an |
c5343203 JS |
1364 | * LLDD to register the existence of a local |
1365 | * NVME subystem FC port. | |
1366 | * @pinfo: pointer to information about the port to be registered | |
1367 | * @template: LLDD entrypoints and operational parameters for the port | |
1368 | * @dev: physical hardware device node port corresponds to. Will be | |
1369 | * used for DMA mappings | |
1370 | * @portptr: pointer to a local port pointer. Upon success, the routine | |
1371 | * will allocate a nvme_fc_local_port structure and place its | |
1372 | * address in the local port pointer. Upon failure, local port | |
1373 | * pointer will be set to NULL. | |
1374 | * | |
1375 | * Returns: | |
1376 | * a completion status. Must be 0 upon success; a negative errno | |
1377 | * (ex: -ENXIO) upon failure. | |
1378 | */ | |
1379 | int | |
1380 | nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, | |
1381 | struct nvmet_fc_target_template *template, | |
1382 | struct device *dev, | |
1383 | struct nvmet_fc_target_port **portptr) | |
1384 | { | |
1385 | struct nvmet_fc_tgtport *newrec; | |
1386 | unsigned long flags; | |
1387 | int ret, idx; | |
1388 | ||
1389 | if (!template->xmt_ls_rsp || !template->fcp_op || | |
a97ec51b | 1390 | !template->fcp_abort || |
19b58d94 | 1391 | !template->fcp_req_release || !template->targetport_delete || |
c5343203 JS |
1392 | !template->max_hw_queues || !template->max_sgl_segments || |
1393 | !template->max_dif_sgl_segments || !template->dma_boundary) { | |
1394 | ret = -EINVAL; | |
1395 | goto out_regtgt_failed; | |
1396 | } | |
1397 | ||
1398 | newrec = kzalloc((sizeof(*newrec) + template->target_priv_sz), | |
1399 | GFP_KERNEL); | |
1400 | if (!newrec) { | |
1401 | ret = -ENOMEM; | |
1402 | goto out_regtgt_failed; | |
1403 | } | |
1404 | ||
6dd0f465 | 1405 | idx = ida_alloc(&nvmet_fc_tgtport_cnt, GFP_KERNEL); |
c5343203 JS |
1406 | if (idx < 0) { |
1407 | ret = -ENOSPC; | |
1408 | goto out_fail_kfree; | |
1409 | } | |
1410 | ||
1411 | if (!get_device(dev) && dev) { | |
1412 | ret = -ENODEV; | |
1413 | goto out_ida_put; | |
1414 | } | |
1415 | ||
1416 | newrec->fc_target_port.node_name = pinfo->node_name; | |
1417 | newrec->fc_target_port.port_name = pinfo->port_name; | |
f56bf76f JS |
1418 | if (template->target_priv_sz) |
1419 | newrec->fc_target_port.private = &newrec[1]; | |
1420 | else | |
1421 | newrec->fc_target_port.private = NULL; | |
c5343203 JS |
1422 | newrec->fc_target_port.port_id = pinfo->port_id; |
1423 | newrec->fc_target_port.port_num = idx; | |
1424 | INIT_LIST_HEAD(&newrec->tgt_list); | |
1425 | newrec->dev = dev; | |
1426 | newrec->ops = template; | |
1427 | spin_lock_init(&newrec->lock); | |
349c694e | 1428 | INIT_LIST_HEAD(&newrec->ls_rcv_list); |
47bf3241 | 1429 | INIT_LIST_HEAD(&newrec->ls_req_list); |
c5343203 JS |
1430 | INIT_LIST_HEAD(&newrec->ls_busylist); |
1431 | INIT_LIST_HEAD(&newrec->assoc_list); | |
58ab8ff9 | 1432 | INIT_LIST_HEAD(&newrec->host_list); |
c5343203 JS |
1433 | kref_init(&newrec->ref); |
1434 | ida_init(&newrec->assoc_cnt); | |
d082dc15 | 1435 | newrec->max_sg_cnt = template->max_sgl_segments; |
710c69db | 1436 | INIT_WORK(&newrec->put_work, nvmet_fc_put_tgtport_work); |
c5343203 JS |
1437 | |
1438 | ret = nvmet_fc_alloc_ls_iodlist(newrec); | |
1439 | if (ret) { | |
1440 | ret = -ENOMEM; | |
1441 | goto out_free_newrec; | |
1442 | } | |
1443 | ||
ea96d649 JS |
1444 | nvmet_fc_portentry_rebind_tgt(newrec); |
1445 | ||
c5343203 JS |
1446 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); |
1447 | list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list); | |
1448 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1449 | ||
1450 | *portptr = &newrec->fc_target_port; | |
1451 | return 0; | |
1452 | ||
1453 | out_free_newrec: | |
1454 | put_device(dev); | |
1455 | out_ida_put: | |
6dd0f465 | 1456 | ida_free(&nvmet_fc_tgtport_cnt, idx); |
c5343203 JS |
1457 | out_fail_kfree: |
1458 | kfree(newrec); | |
1459 | out_regtgt_failed: | |
1460 | *portptr = NULL; | |
1461 | return ret; | |
1462 | } | |
1463 | EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport); | |
1464 | ||
1465 | ||
1466 | static void | |
1467 | nvmet_fc_free_tgtport(struct kref *ref) | |
1468 | { | |
1469 | struct nvmet_fc_tgtport *tgtport = | |
1470 | container_of(ref, struct nvmet_fc_tgtport, ref); | |
1471 | struct device *dev = tgtport->dev; | |
1472 | unsigned long flags; | |
1473 | ||
1474 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1475 | list_del(&tgtport->tgt_list); | |
1476 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1477 | ||
1478 | nvmet_fc_free_ls_iodlist(tgtport); | |
1479 | ||
1480 | /* let the LLDD know we've finished tearing it down */ | |
1481 | tgtport->ops->targetport_delete(&tgtport->fc_target_port); | |
1482 | ||
6dd0f465 | 1483 | ida_free(&nvmet_fc_tgtport_cnt, |
c5343203 JS |
1484 | tgtport->fc_target_port.port_num); |
1485 | ||
1486 | ida_destroy(&tgtport->assoc_cnt); | |
1487 | ||
1488 | kfree(tgtport); | |
1489 | ||
1490 | put_device(dev); | |
1491 | } | |
1492 | ||
1493 | static void | |
1494 | nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport) | |
1495 | { | |
1496 | kref_put(&tgtport->ref, nvmet_fc_free_tgtport); | |
1497 | } | |
1498 | ||
1499 | static int | |
1500 | nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport) | |
1501 | { | |
1502 | return kref_get_unless_zero(&tgtport->ref); | |
1503 | } | |
1504 | ||
1505 | static void | |
1506 | __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport) | |
1507 | { | |
4e2f02bf | 1508 | struct nvmet_fc_tgt_assoc *assoc; |
c5343203 | 1509 | |
4e2f02bf LR |
1510 | rcu_read_lock(); |
1511 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
c5343203 JS |
1512 | if (!nvmet_fc_tgt_a_get(assoc)) |
1513 | continue; | |
fe506a74 | 1514 | nvmet_fc_schedule_delete_assoc(assoc); |
4049dc96 | 1515 | nvmet_fc_tgt_a_put(assoc); |
c5343203 | 1516 | } |
4e2f02bf | 1517 | rcu_read_unlock(); |
c5343203 JS |
1518 | } |
1519 | ||
72e6329f JS |
1520 | /** |
1521 | * nvmet_fc_invalidate_host - transport entry point called by an LLDD | |
1522 | * to remove references to a hosthandle for LS's. | |
1523 | * | |
1524 | * The nvmet-fc layer ensures that any references to the hosthandle | |
1525 | * on the targetport are forgotten (set to NULL). The LLDD will | |
1526 | * typically call this when a login with a remote host port has been | |
1527 | * lost, thus LS's for the remote host port are no longer possible. | |
1528 | * | |
1529 | * If an LS request is outstanding to the targetport/hosthandle (or | |
1530 | * issued concurrently with the call to invalidate the host), the | |
1531 | * LLDD is responsible for terminating/aborting the LS and completing | |
1532 | * the LS request. It is recommended that these terminations/aborts | |
1533 | * occur after calling to invalidate the host handle to avoid additional | |
1534 | * retries by the nvmet-fc transport. The nvmet-fc transport may | |
1535 | * continue to reference host handle while it cleans up outstanding | |
1536 | * NVME associations. The nvmet-fc transport will call the | |
1537 | * ops->host_release() callback to notify the LLDD that all references | |
1538 | * are complete and the related host handle can be recovered. | |
1539 | * Note: if there are no references, the callback may be called before | |
1540 | * the invalidate host call returns. | |
1541 | * | |
1542 | * @target_port: pointer to the (registered) target port that a prior | |
1543 | * LS was received on and which supplied the transport the | |
1544 | * hosthandle. | |
1545 | * @hosthandle: the handle (pointer) that represents the host port | |
1546 | * that no longer has connectivity and that LS's should | |
1547 | * no longer be directed to. | |
1548 | */ | |
1549 | void | |
1550 | nvmet_fc_invalidate_host(struct nvmet_fc_target_port *target_port, | |
1551 | void *hosthandle) | |
1552 | { | |
58ab8ff9 JS |
1553 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); |
1554 | struct nvmet_fc_tgt_assoc *assoc, *next; | |
1555 | unsigned long flags; | |
1556 | bool noassoc = true; | |
58ab8ff9 JS |
1557 | |
1558 | spin_lock_irqsave(&tgtport->lock, flags); | |
1559 | list_for_each_entry_safe(assoc, next, | |
1560 | &tgtport->assoc_list, a_list) { | |
50b474e1 | 1561 | if (assoc->hostport->hosthandle != hosthandle) |
58ab8ff9 JS |
1562 | continue; |
1563 | if (!nvmet_fc_tgt_a_get(assoc)) | |
1564 | continue; | |
1565 | assoc->hostport->invalid = 1; | |
1566 | noassoc = false; | |
fe506a74 | 1567 | nvmet_fc_schedule_delete_assoc(assoc); |
4049dc96 | 1568 | nvmet_fc_tgt_a_put(assoc); |
58ab8ff9 JS |
1569 | } |
1570 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1571 | ||
1572 | /* if there's nothing to wait for - call the callback */ | |
1573 | if (noassoc && tgtport->ops->host_release) | |
1574 | tgtport->ops->host_release(hosthandle); | |
72e6329f JS |
1575 | } |
1576 | EXPORT_SYMBOL_GPL(nvmet_fc_invalidate_host); | |
1577 | ||
c5343203 JS |
1578 | /* |
1579 | * nvmet layer has called to terminate an association | |
1580 | */ | |
1581 | static void | |
1582 | nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl) | |
1583 | { | |
1584 | struct nvmet_fc_tgtport *tgtport, *next; | |
1585 | struct nvmet_fc_tgt_assoc *assoc; | |
1586 | struct nvmet_fc_tgt_queue *queue; | |
1587 | unsigned long flags; | |
1588 | bool found_ctrl = false; | |
1589 | ||
1590 | /* this is a bit ugly, but don't want to make locks layered */ | |
1591 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1592 | list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list, | |
1593 | tgt_list) { | |
1594 | if (!nvmet_fc_tgtport_get(tgtport)) | |
1595 | continue; | |
1596 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1597 | ||
4e2f02bf LR |
1598 | rcu_read_lock(); |
1599 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
4049dc96 | 1600 | queue = assoc->queues[0]; |
c5343203 JS |
1601 | if (queue && queue->nvme_sq.ctrl == ctrl) { |
1602 | if (nvmet_fc_tgt_a_get(assoc)) | |
1603 | found_ctrl = true; | |
1604 | break; | |
1605 | } | |
1606 | } | |
4e2f02bf | 1607 | rcu_read_unlock(); |
c5343203 JS |
1608 | |
1609 | nvmet_fc_tgtport_put(tgtport); | |
1610 | ||
1611 | if (found_ctrl) { | |
fe506a74 | 1612 | nvmet_fc_schedule_delete_assoc(assoc); |
4049dc96 | 1613 | nvmet_fc_tgt_a_put(assoc); |
c5343203 JS |
1614 | return; |
1615 | } | |
1616 | ||
1617 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1618 | } | |
1619 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1620 | } | |
1621 | ||
1622 | /** | |
0acb8231 | 1623 | * nvmet_fc_unregister_targetport - transport entry point called by an |
c5343203 JS |
1624 | * LLDD to deregister/remove a previously |
1625 | * registered a local NVME subsystem FC port. | |
1c466527 BVA |
1626 | * @target_port: pointer to the (registered) target port that is to be |
1627 | * deregistered. | |
c5343203 JS |
1628 | * |
1629 | * Returns: | |
1630 | * a completion status. Must be 0 upon success; a negative errno | |
1631 | * (ex: -ENXIO) upon failure. | |
1632 | */ | |
1633 | int | |
1634 | nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port) | |
1635 | { | |
1636 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
1637 | ||
ea96d649 JS |
1638 | nvmet_fc_portentry_unbind_tgt(tgtport); |
1639 | ||
c5343203 JS |
1640 | /* terminate any outstanding associations */ |
1641 | __nvmet_fc_free_assocs(tgtport); | |
1642 | ||
4049dc96 DW |
1643 | flush_workqueue(nvmet_wq); |
1644 | ||
47bf3241 JS |
1645 | /* |
1646 | * should terminate LS's as well. However, LS's will be generated | |
1647 | * at the tail end of association termination, so they likely don't | |
1648 | * exist yet. And even if they did, it's worthwhile to just let | |
1649 | * them finish and targetport ref counting will clean things up. | |
1650 | */ | |
1651 | ||
c5343203 JS |
1652 | nvmet_fc_tgtport_put(tgtport); |
1653 | ||
1654 | return 0; | |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport); | |
1657 | ||
1658 | ||
47bf3241 | 1659 | /* ********************** FC-NVME LS RCV Handling ************************* */ |
c5343203 JS |
1660 | |
1661 | ||
c5343203 JS |
1662 | static void |
1663 | nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport, | |
1664 | struct nvmet_fc_ls_iod *iod) | |
1665 | { | |
3b8281b0 JS |
1666 | struct fcnvme_ls_cr_assoc_rqst *rqst = &iod->rqstbuf->rq_cr_assoc; |
1667 | struct fcnvme_ls_cr_assoc_acc *acc = &iod->rspbuf->rsp_cr_assoc; | |
c5343203 JS |
1668 | struct nvmet_fc_tgt_queue *queue; |
1669 | int ret = 0; | |
1670 | ||
1671 | memset(acc, 0, sizeof(*acc)); | |
1672 | ||
4cb7ca80 JS |
1673 | /* |
1674 | * FC-NVME spec changes. There are initiators sending different | |
1675 | * lengths as padding sizes for Create Association Cmd descriptor | |
1676 | * was incorrect. | |
1677 | * Accept anything of "minimum" length. Assume format per 1.15 | |
1678 | * spec (with HOSTID reduced to 16 bytes), ignore how long the | |
1679 | * trailing pad length is. | |
1680 | */ | |
1681 | if (iod->rqstdatalen < FCNVME_LSDESC_CRA_RQST_MINLEN) | |
c5343203 | 1682 | ret = VERR_CR_ASSOC_LEN; |
7722ecdc CH |
1683 | else if (be32_to_cpu(rqst->desc_list_len) < |
1684 | FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN) | |
c5343203 JS |
1685 | ret = VERR_CR_ASSOC_RQST_LEN; |
1686 | else if (rqst->assoc_cmd.desc_tag != | |
1687 | cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD)) | |
1688 | ret = VERR_CR_ASSOC_CMD; | |
7722ecdc CH |
1689 | else if (be32_to_cpu(rqst->assoc_cmd.desc_len) < |
1690 | FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN) | |
c5343203 JS |
1691 | ret = VERR_CR_ASSOC_CMD_LEN; |
1692 | else if (!rqst->assoc_cmd.ersp_ratio || | |
1693 | (be16_to_cpu(rqst->assoc_cmd.ersp_ratio) >= | |
1694 | be16_to_cpu(rqst->assoc_cmd.sqsize))) | |
1695 | ret = VERR_ERSP_RATIO; | |
1696 | ||
1697 | else { | |
1698 | /* new association w/ admin queue */ | |
58ab8ff9 JS |
1699 | iod->assoc = nvmet_fc_alloc_target_assoc( |
1700 | tgtport, iod->hosthandle); | |
c5343203 JS |
1701 | if (!iod->assoc) |
1702 | ret = VERR_ASSOC_ALLOC_FAIL; | |
1703 | else { | |
1704 | queue = nvmet_fc_alloc_target_queue(iod->assoc, 0, | |
1705 | be16_to_cpu(rqst->assoc_cmd.sqsize)); | |
0cab4404 | 1706 | if (!queue) { |
c5343203 | 1707 | ret = VERR_QUEUE_ALLOC_FAIL; |
0cab4404 AE |
1708 | nvmet_fc_tgt_a_put(iod->assoc); |
1709 | } | |
c5343203 JS |
1710 | } |
1711 | } | |
1712 | ||
1713 | if (ret) { | |
1714 | dev_err(tgtport->dev, | |
1715 | "Create Association LS failed: %s\n", | |
1716 | validation_errors[ret]); | |
ca19bcd0 | 1717 | iod->lsrsp->rsplen = nvme_fc_format_rjt(acc, |
3b8281b0 | 1718 | sizeof(*acc), rqst->w0.ls_cmd, |
4083aa98 JS |
1719 | FCNVME_RJT_RC_LOGIC, |
1720 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1721 | return; |
1722 | } | |
1723 | ||
1724 | queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio); | |
1725 | atomic_set(&queue->connected, 1); | |
1726 | queue->sqhd = 0; /* best place to init value */ | |
1727 | ||
47bf3241 JS |
1728 | dev_info(tgtport->dev, |
1729 | "{%d:%d} Association created\n", | |
1730 | tgtport->fc_target_port.port_num, iod->assoc->a_id); | |
1731 | ||
c5343203 JS |
1732 | /* format a response */ |
1733 | ||
72e6329f | 1734 | iod->lsrsp->rsplen = sizeof(*acc); |
c5343203 | 1735 | |
ca19bcd0 | 1736 | nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, |
c5343203 JS |
1737 | fcnvme_lsdesc_len( |
1738 | sizeof(struct fcnvme_ls_cr_assoc_acc)), | |
1739 | FCNVME_LS_CREATE_ASSOCIATION); | |
1740 | acc->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); | |
1741 | acc->associd.desc_len = | |
1742 | fcnvme_lsdesc_len( | |
1743 | sizeof(struct fcnvme_lsdesc_assoc_id)); | |
1744 | acc->associd.association_id = | |
1745 | cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, 0)); | |
1746 | acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); | |
1747 | acc->connectid.desc_len = | |
1748 | fcnvme_lsdesc_len( | |
1749 | sizeof(struct fcnvme_lsdesc_conn_id)); | |
1750 | acc->connectid.connection_id = acc->associd.association_id; | |
1751 | } | |
1752 | ||
1753 | static void | |
1754 | nvmet_fc_ls_create_connection(struct nvmet_fc_tgtport *tgtport, | |
1755 | struct nvmet_fc_ls_iod *iod) | |
1756 | { | |
3b8281b0 JS |
1757 | struct fcnvme_ls_cr_conn_rqst *rqst = &iod->rqstbuf->rq_cr_conn; |
1758 | struct fcnvme_ls_cr_conn_acc *acc = &iod->rspbuf->rsp_cr_conn; | |
c5343203 JS |
1759 | struct nvmet_fc_tgt_queue *queue; |
1760 | int ret = 0; | |
1761 | ||
1762 | memset(acc, 0, sizeof(*acc)); | |
1763 | ||
1764 | if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_conn_rqst)) | |
1765 | ret = VERR_CR_CONN_LEN; | |
1766 | else if (rqst->desc_list_len != | |
1767 | fcnvme_lsdesc_len( | |
1768 | sizeof(struct fcnvme_ls_cr_conn_rqst))) | |
1769 | ret = VERR_CR_CONN_RQST_LEN; | |
1770 | else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) | |
1771 | ret = VERR_ASSOC_ID; | |
1772 | else if (rqst->associd.desc_len != | |
1773 | fcnvme_lsdesc_len( | |
1774 | sizeof(struct fcnvme_lsdesc_assoc_id))) | |
1775 | ret = VERR_ASSOC_ID_LEN; | |
1776 | else if (rqst->connect_cmd.desc_tag != | |
1777 | cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD)) | |
1778 | ret = VERR_CR_CONN_CMD; | |
1779 | else if (rqst->connect_cmd.desc_len != | |
1780 | fcnvme_lsdesc_len( | |
1781 | sizeof(struct fcnvme_lsdesc_cr_conn_cmd))) | |
1782 | ret = VERR_CR_CONN_CMD_LEN; | |
1783 | else if (!rqst->connect_cmd.ersp_ratio || | |
1784 | (be16_to_cpu(rqst->connect_cmd.ersp_ratio) >= | |
1785 | be16_to_cpu(rqst->connect_cmd.sqsize))) | |
1786 | ret = VERR_ERSP_RATIO; | |
1787 | ||
1788 | else { | |
1789 | /* new io queue */ | |
1790 | iod->assoc = nvmet_fc_find_target_assoc(tgtport, | |
1791 | be64_to_cpu(rqst->associd.association_id)); | |
1792 | if (!iod->assoc) | |
1793 | ret = VERR_NO_ASSOC; | |
1794 | else { | |
1795 | queue = nvmet_fc_alloc_target_queue(iod->assoc, | |
1796 | be16_to_cpu(rqst->connect_cmd.qid), | |
1797 | be16_to_cpu(rqst->connect_cmd.sqsize)); | |
1798 | if (!queue) | |
1799 | ret = VERR_QUEUE_ALLOC_FAIL; | |
1800 | ||
1801 | /* release get taken in nvmet_fc_find_target_assoc */ | |
1802 | nvmet_fc_tgt_a_put(iod->assoc); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | if (ret) { | |
1807 | dev_err(tgtport->dev, | |
1808 | "Create Connection LS failed: %s\n", | |
1809 | validation_errors[ret]); | |
ca19bcd0 | 1810 | iod->lsrsp->rsplen = nvme_fc_format_rjt(acc, |
3b8281b0 | 1811 | sizeof(*acc), rqst->w0.ls_cmd, |
c5343203 | 1812 | (ret == VERR_NO_ASSOC) ? |
4083aa98 JS |
1813 | FCNVME_RJT_RC_INV_ASSOC : |
1814 | FCNVME_RJT_RC_LOGIC, | |
1815 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1816 | return; |
1817 | } | |
1818 | ||
1819 | queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio); | |
1820 | atomic_set(&queue->connected, 1); | |
1821 | queue->sqhd = 0; /* best place to init value */ | |
1822 | ||
1823 | /* format a response */ | |
1824 | ||
72e6329f | 1825 | iod->lsrsp->rsplen = sizeof(*acc); |
c5343203 | 1826 | |
ca19bcd0 | 1827 | nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, |
c5343203 JS |
1828 | fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)), |
1829 | FCNVME_LS_CREATE_CONNECTION); | |
1830 | acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); | |
1831 | acc->connectid.desc_len = | |
1832 | fcnvme_lsdesc_len( | |
1833 | sizeof(struct fcnvme_lsdesc_conn_id)); | |
1834 | acc->connectid.connection_id = | |
1835 | cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, | |
1836 | be16_to_cpu(rqst->connect_cmd.qid))); | |
1837 | } | |
1838 | ||
47bf3241 JS |
1839 | /* |
1840 | * Returns true if the LS response is to be transmit | |
1841 | * Returns false if the LS response is to be delayed | |
1842 | */ | |
1843 | static int | |
c5343203 JS |
1844 | nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport, |
1845 | struct nvmet_fc_ls_iod *iod) | |
1846 | { | |
53b2b2f5 | 1847 | struct fcnvme_ls_disconnect_assoc_rqst *rqst = |
3b8281b0 | 1848 | &iod->rqstbuf->rq_dis_assoc; |
53b2b2f5 | 1849 | struct fcnvme_ls_disconnect_assoc_acc *acc = |
3b8281b0 | 1850 | &iod->rspbuf->rsp_dis_assoc; |
e4fcc72c | 1851 | struct nvmet_fc_tgt_assoc *assoc = NULL; |
47bf3241 JS |
1852 | struct nvmet_fc_ls_iod *oldls = NULL; |
1853 | unsigned long flags; | |
c5343203 | 1854 | int ret = 0; |
c5343203 JS |
1855 | |
1856 | memset(acc, 0, sizeof(*acc)); | |
1857 | ||
ec3b0e3c JS |
1858 | ret = nvmefc_vldt_lsreq_discon_assoc(iod->rqstdatalen, rqst); |
1859 | if (!ret) { | |
47bf3241 | 1860 | /* match an active association - takes an assoc ref if !NULL */ |
c5343203 JS |
1861 | assoc = nvmet_fc_find_target_assoc(tgtport, |
1862 | be64_to_cpu(rqst->associd.association_id)); | |
1863 | iod->assoc = assoc; | |
404ec31d | 1864 | if (!assoc) |
c5343203 JS |
1865 | ret = VERR_NO_ASSOC; |
1866 | } | |
1867 | ||
e4fcc72c | 1868 | if (ret || !assoc) { |
c5343203 JS |
1869 | dev_err(tgtport->dev, |
1870 | "Disconnect LS failed: %s\n", | |
1871 | validation_errors[ret]); | |
ca19bcd0 | 1872 | iod->lsrsp->rsplen = nvme_fc_format_rjt(acc, |
3b8281b0 | 1873 | sizeof(*acc), rqst->w0.ls_cmd, |
4083aa98 JS |
1874 | (ret == VERR_NO_ASSOC) ? |
1875 | FCNVME_RJT_RC_INV_ASSOC : | |
ca19bcd0 | 1876 | FCNVME_RJT_RC_LOGIC, |
4083aa98 | 1877 | FCNVME_RJT_EXP_NONE, 0); |
47bf3241 | 1878 | return true; |
c5343203 JS |
1879 | } |
1880 | ||
1881 | /* format a response */ | |
1882 | ||
72e6329f | 1883 | iod->lsrsp->rsplen = sizeof(*acc); |
c5343203 | 1884 | |
ca19bcd0 | 1885 | nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, |
c5343203 | 1886 | fcnvme_lsdesc_len( |
53b2b2f5 JS |
1887 | sizeof(struct fcnvme_ls_disconnect_assoc_acc)), |
1888 | FCNVME_LS_DISCONNECT_ASSOC); | |
c5343203 | 1889 | |
47bf3241 JS |
1890 | /* |
1891 | * The rules for LS response says the response cannot | |
1892 | * go back until ABTS's have been sent for all outstanding | |
1893 | * I/O and a Disconnect Association LS has been sent. | |
1894 | * So... save off the Disconnect LS to send the response | |
1895 | * later. If there was a prior LS already saved, replace | |
1896 | * it with the newer one and send a can't perform reject | |
1897 | * on the older one. | |
1898 | */ | |
1899 | spin_lock_irqsave(&tgtport->lock, flags); | |
1900 | oldls = assoc->rcv_disconn; | |
1901 | assoc->rcv_disconn = iod; | |
1902 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1903 | ||
47bf3241 JS |
1904 | if (oldls) { |
1905 | dev_info(tgtport->dev, | |
1906 | "{%d:%d} Multiple Disconnect Association LS's " | |
1907 | "received\n", | |
1908 | tgtport->fc_target_port.port_num, assoc->a_id); | |
1909 | /* overwrite good response with bogus failure */ | |
1910 | oldls->lsrsp->rsplen = nvme_fc_format_rjt(oldls->rspbuf, | |
1911 | sizeof(*iod->rspbuf), | |
1912 | /* ok to use rqst, LS is same */ | |
1913 | rqst->w0.ls_cmd, | |
1914 | FCNVME_RJT_RC_UNAB, | |
1915 | FCNVME_RJT_EXP_NONE, 0); | |
1916 | nvmet_fc_xmt_ls_rsp(tgtport, oldls); | |
1917 | } | |
c5343203 | 1918 | |
fe506a74 | 1919 | nvmet_fc_schedule_delete_assoc(assoc); |
4049dc96 DW |
1920 | nvmet_fc_tgt_a_put(assoc); |
1921 | ||
47bf3241 | 1922 | return false; |
c5343203 JS |
1923 | } |
1924 | ||
1925 | ||
1926 | /* *********************** NVME Ctrl Routines **************************** */ | |
1927 | ||
1928 | ||
1929 | static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req); | |
1930 | ||
e929f06d | 1931 | static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops; |
c5343203 JS |
1932 | |
1933 | static void | |
72e6329f | 1934 | nvmet_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp) |
c5343203 | 1935 | { |
72e6329f | 1936 | struct nvmet_fc_ls_iod *iod = lsrsp->nvme_fc_private; |
c5343203 JS |
1937 | struct nvmet_fc_tgtport *tgtport = iod->tgtport; |
1938 | ||
1939 | fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma, | |
3b8281b0 | 1940 | sizeof(*iod->rspbuf), DMA_TO_DEVICE); |
c5343203 JS |
1941 | nvmet_fc_free_ls_iod(tgtport, iod); |
1942 | nvmet_fc_tgtport_put(tgtport); | |
1943 | } | |
1944 | ||
1945 | static void | |
1946 | nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, | |
1947 | struct nvmet_fc_ls_iod *iod) | |
1948 | { | |
1949 | int ret; | |
1950 | ||
1951 | fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma, | |
3b8281b0 | 1952 | sizeof(*iod->rspbuf), DMA_TO_DEVICE); |
c5343203 | 1953 | |
72e6329f | 1954 | ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsrsp); |
c5343203 | 1955 | if (ret) |
72e6329f | 1956 | nvmet_fc_xmt_ls_rsp_done(iod->lsrsp); |
c5343203 JS |
1957 | } |
1958 | ||
1959 | /* | |
1960 | * Actual processing routine for received FC-NVME LS Requests from the LLD | |
1961 | */ | |
1962 | static void | |
1963 | nvmet_fc_handle_ls_rqst(struct nvmet_fc_tgtport *tgtport, | |
1964 | struct nvmet_fc_ls_iod *iod) | |
1965 | { | |
3b8281b0 | 1966 | struct fcnvme_ls_rqst_w0 *w0 = &iod->rqstbuf->rq_cr_assoc.w0; |
47bf3241 | 1967 | bool sendrsp = true; |
c5343203 | 1968 | |
72e6329f JS |
1969 | iod->lsrsp->nvme_fc_private = iod; |
1970 | iod->lsrsp->rspbuf = iod->rspbuf; | |
1971 | iod->lsrsp->rspdma = iod->rspdma; | |
1972 | iod->lsrsp->done = nvmet_fc_xmt_ls_rsp_done; | |
c5343203 | 1973 | /* Be preventative. handlers will later set to valid length */ |
72e6329f | 1974 | iod->lsrsp->rsplen = 0; |
c5343203 JS |
1975 | |
1976 | iod->assoc = NULL; | |
1977 | ||
1978 | /* | |
1979 | * handlers: | |
1980 | * parse request input, execute the request, and format the | |
1981 | * LS response | |
1982 | */ | |
1983 | switch (w0->ls_cmd) { | |
1984 | case FCNVME_LS_CREATE_ASSOCIATION: | |
1985 | /* Creates Association and initial Admin Queue/Connection */ | |
1986 | nvmet_fc_ls_create_association(tgtport, iod); | |
1987 | break; | |
1988 | case FCNVME_LS_CREATE_CONNECTION: | |
1989 | /* Creates an IO Queue/Connection */ | |
1990 | nvmet_fc_ls_create_connection(tgtport, iod); | |
1991 | break; | |
53b2b2f5 | 1992 | case FCNVME_LS_DISCONNECT_ASSOC: |
c5343203 | 1993 | /* Terminate a Queue/Connection or the Association */ |
47bf3241 | 1994 | sendrsp = nvmet_fc_ls_disconnect(tgtport, iod); |
c5343203 JS |
1995 | break; |
1996 | default: | |
ca19bcd0 | 1997 | iod->lsrsp->rsplen = nvme_fc_format_rjt(iod->rspbuf, |
3b8281b0 | 1998 | sizeof(*iod->rspbuf), w0->ls_cmd, |
4083aa98 | 1999 | FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0); |
c5343203 JS |
2000 | } |
2001 | ||
47bf3241 JS |
2002 | if (sendrsp) |
2003 | nvmet_fc_xmt_ls_rsp(tgtport, iod); | |
c5343203 JS |
2004 | } |
2005 | ||
2006 | /* | |
2007 | * Actual processing routine for received FC-NVME LS Requests from the LLD | |
2008 | */ | |
2009 | static void | |
2010 | nvmet_fc_handle_ls_rqst_work(struct work_struct *work) | |
2011 | { | |
2012 | struct nvmet_fc_ls_iod *iod = | |
2013 | container_of(work, struct nvmet_fc_ls_iod, work); | |
2014 | struct nvmet_fc_tgtport *tgtport = iod->tgtport; | |
2015 | ||
2016 | nvmet_fc_handle_ls_rqst(tgtport, iod); | |
2017 | } | |
2018 | ||
2019 | ||
2020 | /** | |
2021 | * nvmet_fc_rcv_ls_req - transport entry point called by an LLDD | |
2022 | * upon the reception of a NVME LS request. | |
2023 | * | |
2024 | * The nvmet-fc layer will copy payload to an internal structure for | |
2025 | * processing. As such, upon completion of the routine, the LLDD may | |
2026 | * immediately free/reuse the LS request buffer passed in the call. | |
2027 | * | |
2028 | * If this routine returns error, the LLDD should abort the exchange. | |
2029 | * | |
1c466527 | 2030 | * @target_port: pointer to the (registered) target port the LS was |
c5343203 | 2031 | * received on. |
b53d4741 | 2032 | * @hosthandle: pointer to the host specific data, gets stored in iod. |
72e6329f | 2033 | * @lsrsp: pointer to a lsrsp structure to be used to reference |
c5343203 JS |
2034 | * the exchange corresponding to the LS. |
2035 | * @lsreqbuf: pointer to the buffer containing the LS Request | |
2036 | * @lsreqbuf_len: length, in bytes, of the received LS request | |
2037 | */ | |
2038 | int | |
2039 | nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port, | |
72e6329f JS |
2040 | void *hosthandle, |
2041 | struct nvmefc_ls_rsp *lsrsp, | |
c5343203 JS |
2042 | void *lsreqbuf, u32 lsreqbuf_len) |
2043 | { | |
2044 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
2045 | struct nvmet_fc_ls_iod *iod; | |
a5c2b4f6 JS |
2046 | struct fcnvme_ls_rqst_w0 *w0 = (struct fcnvme_ls_rqst_w0 *)lsreqbuf; |
2047 | ||
2048 | if (lsreqbuf_len > sizeof(union nvmefc_ls_requests)) { | |
2049 | dev_info(tgtport->dev, | |
2050 | "RCV %s LS failed: payload too large (%d)\n", | |
2051 | (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ? | |
2052 | nvmefc_ls_names[w0->ls_cmd] : "", | |
2053 | lsreqbuf_len); | |
c5343203 | 2054 | return -E2BIG; |
a5c2b4f6 | 2055 | } |
c5343203 | 2056 | |
a5c2b4f6 JS |
2057 | if (!nvmet_fc_tgtport_get(tgtport)) { |
2058 | dev_info(tgtport->dev, | |
2059 | "RCV %s LS failed: target deleting\n", | |
2060 | (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ? | |
2061 | nvmefc_ls_names[w0->ls_cmd] : ""); | |
c5343203 | 2062 | return -ESHUTDOWN; |
a5c2b4f6 | 2063 | } |
c5343203 JS |
2064 | |
2065 | iod = nvmet_fc_alloc_ls_iod(tgtport); | |
2066 | if (!iod) { | |
a5c2b4f6 JS |
2067 | dev_info(tgtport->dev, |
2068 | "RCV %s LS failed: context allocation failed\n", | |
2069 | (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ? | |
2070 | nvmefc_ls_names[w0->ls_cmd] : ""); | |
c5343203 JS |
2071 | nvmet_fc_tgtport_put(tgtport); |
2072 | return -ENOENT; | |
2073 | } | |
2074 | ||
72e6329f | 2075 | iod->lsrsp = lsrsp; |
c5343203 JS |
2076 | iod->fcpreq = NULL; |
2077 | memcpy(iod->rqstbuf, lsreqbuf, lsreqbuf_len); | |
2078 | iod->rqstdatalen = lsreqbuf_len; | |
58ab8ff9 | 2079 | iod->hosthandle = hosthandle; |
c5343203 | 2080 | |
8832cf92 | 2081 | queue_work(nvmet_wq, &iod->work); |
c5343203 JS |
2082 | |
2083 | return 0; | |
2084 | } | |
2085 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_ls_req); | |
2086 | ||
2087 | ||
2088 | /* | |
2089 | * ********************** | |
2090 | * Start of FCP handling | |
2091 | * ********************** | |
2092 | */ | |
2093 | ||
2094 | static int | |
2095 | nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod) | |
2096 | { | |
2097 | struct scatterlist *sg; | |
c5343203 | 2098 | unsigned int nent; |
c5343203 | 2099 | |
4442b56f | 2100 | sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent); |
c5343203 JS |
2101 | if (!sg) |
2102 | goto out; | |
2103 | ||
c5343203 JS |
2104 | fod->data_sg = sg; |
2105 | fod->data_sg_cnt = nent; | |
2106 | fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent, | |
2107 | ((fod->io_dir == NVMET_FCP_WRITE) ? | |
2108 | DMA_FROM_DEVICE : DMA_TO_DEVICE)); | |
2109 | /* note: write from initiator perspective */ | |
d082dc15 | 2110 | fod->next_sg = fod->data_sg; |
c5343203 JS |
2111 | |
2112 | return 0; | |
2113 | ||
c5343203 JS |
2114 | out: |
2115 | return NVME_SC_INTERNAL; | |
2116 | } | |
2117 | ||
2118 | static void | |
2119 | nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod) | |
2120 | { | |
c5343203 JS |
2121 | if (!fod->data_sg || !fod->data_sg_cnt) |
2122 | return; | |
2123 | ||
2124 | fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt, | |
2125 | ((fod->io_dir == NVMET_FCP_WRITE) ? | |
2126 | DMA_FROM_DEVICE : DMA_TO_DEVICE)); | |
4442b56f | 2127 | sgl_free(fod->data_sg); |
c820ad4c JS |
2128 | fod->data_sg = NULL; |
2129 | fod->data_sg_cnt = 0; | |
c5343203 JS |
2130 | } |
2131 | ||
2132 | ||
2133 | static bool | |
2134 | queue_90percent_full(struct nvmet_fc_tgt_queue *q, u32 sqhd) | |
2135 | { | |
2136 | u32 sqtail, used; | |
2137 | ||
2138 | /* egad, this is ugly. And sqtail is just a best guess */ | |
2139 | sqtail = atomic_read(&q->sqtail) % q->sqsize; | |
2140 | ||
2141 | used = (sqtail < sqhd) ? (sqtail + q->sqsize - sqhd) : (sqtail - sqhd); | |
2142 | return ((used * 10) >= (((u32)(q->sqsize - 1) * 9))); | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * Prep RSP payload. | |
2147 | * May be a NVMET_FCOP_RSP or NVMET_FCOP_READDATA_RSP op | |
2148 | */ | |
2149 | static void | |
2150 | nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, | |
2151 | struct nvmet_fc_fcp_iod *fod) | |
2152 | { | |
2153 | struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf; | |
2154 | struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; | |
2155 | struct nvme_completion *cqe = &ersp->cqe; | |
2156 | u32 *cqewd = (u32 *)cqe; | |
2157 | bool send_ersp = false; | |
2158 | u32 rsn, rspcnt, xfr_length; | |
2159 | ||
2160 | if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP) | |
5e62d5c9 | 2161 | xfr_length = fod->req.transfer_len; |
c5343203 JS |
2162 | else |
2163 | xfr_length = fod->offset; | |
2164 | ||
2165 | /* | |
2166 | * check to see if we can send a 0's rsp. | |
2167 | * Note: to send a 0's response, the NVME-FC host transport will | |
2168 | * recreate the CQE. The host transport knows: sq id, SQHD (last | |
2169 | * seen in an ersp), and command_id. Thus it will create a | |
2170 | * zero-filled CQE with those known fields filled in. Transport | |
2171 | * must send an ersp for any condition where the cqe won't match | |
2172 | * this. | |
2173 | * | |
2174 | * Here are the FC-NVME mandated cases where we must send an ersp: | |
2175 | * every N responses, where N=ersp_ratio | |
2176 | * force fabric commands to send ersp's (not in FC-NVME but good | |
2177 | * practice) | |
2178 | * normal cmds: any time status is non-zero, or status is zero | |
2179 | * but words 0 or 1 are non-zero. | |
2180 | * the SQ is 90% or more full | |
2181 | * the cmd is a fused command | |
2182 | * transferred data length not equal to cmd iu length | |
2183 | */ | |
2184 | rspcnt = atomic_inc_return(&fod->queue->zrspcnt); | |
2185 | if (!(rspcnt % fod->queue->ersp_ratio) || | |
7a1f46e3 | 2186 | nvme_is_fabrics((struct nvme_command *) sqe) || |
5e62d5c9 | 2187 | xfr_length != fod->req.transfer_len || |
c5343203 JS |
2188 | (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] || |
2189 | (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) || | |
8ad76cf1 | 2190 | queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head))) |
c5343203 JS |
2191 | send_ersp = true; |
2192 | ||
2193 | /* re-set the fields */ | |
2194 | fod->fcpreq->rspaddr = ersp; | |
2195 | fod->fcpreq->rspdma = fod->rspdma; | |
2196 | ||
2197 | if (!send_ersp) { | |
2198 | memset(ersp, 0, NVME_FC_SIZEOF_ZEROS_RSP); | |
2199 | fod->fcpreq->rsplen = NVME_FC_SIZEOF_ZEROS_RSP; | |
2200 | } else { | |
2201 | ersp->iu_len = cpu_to_be16(sizeof(*ersp)/sizeof(u32)); | |
2202 | rsn = atomic_inc_return(&fod->queue->rsn); | |
2203 | ersp->rsn = cpu_to_be32(rsn); | |
2204 | ersp->xfrd_len = cpu_to_be32(xfr_length); | |
2205 | fod->fcpreq->rsplen = sizeof(*ersp); | |
2206 | } | |
2207 | ||
2208 | fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma, | |
2209 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
2210 | } | |
2211 | ||
2212 | static void nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq); | |
2213 | ||
a97ec51b JS |
2214 | static void |
2215 | nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport, | |
2216 | struct nvmet_fc_fcp_iod *fod) | |
2217 | { | |
2218 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
2219 | ||
2220 | /* data no longer needed */ | |
2221 | nvmet_fc_free_tgt_pgs(fod); | |
2222 | ||
2223 | /* | |
2224 | * if an ABTS was received or we issued the fcp_abort early | |
2225 | * don't call abort routine again. | |
2226 | */ | |
2227 | /* no need to take lock - lock was taken earlier to get here */ | |
2228 | if (!fod->aborted) | |
2229 | tgtport->ops->fcp_abort(&tgtport->fc_target_port, fcpreq); | |
2230 | ||
2231 | nvmet_fc_free_fcp_iod(fod->queue, fod); | |
2232 | } | |
2233 | ||
c5343203 JS |
2234 | static void |
2235 | nvmet_fc_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport, | |
2236 | struct nvmet_fc_fcp_iod *fod) | |
2237 | { | |
2238 | int ret; | |
2239 | ||
2240 | fod->fcpreq->op = NVMET_FCOP_RSP; | |
2241 | fod->fcpreq->timeout = 0; | |
2242 | ||
2243 | nvmet_fc_prep_fcp_rsp(tgtport, fod); | |
2244 | ||
2245 | ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); | |
2246 | if (ret) | |
a97ec51b | 2247 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2248 | } |
2249 | ||
2250 | static void | |
2251 | nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, | |
2252 | struct nvmet_fc_fcp_iod *fod, u8 op) | |
2253 | { | |
2254 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
d082dc15 | 2255 | struct scatterlist *sg = fod->next_sg; |
a97ec51b | 2256 | unsigned long flags; |
d082dc15 JS |
2257 | u32 remaininglen = fod->req.transfer_len - fod->offset; |
2258 | u32 tlen = 0; | |
c5343203 JS |
2259 | int ret; |
2260 | ||
2261 | fcpreq->op = op; | |
2262 | fcpreq->offset = fod->offset; | |
2263 | fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC; | |
48fa362b | 2264 | |
d082dc15 JS |
2265 | /* |
2266 | * for next sequence: | |
2267 | * break at a sg element boundary | |
2268 | * attempt to keep sequence length capped at | |
2269 | * NVMET_FC_MAX_SEQ_LENGTH but allow sequence to | |
2270 | * be longer if a single sg element is larger | |
2271 | * than that amount. This is done to avoid creating | |
2272 | * a new sg list to use for the tgtport api. | |
2273 | */ | |
2274 | fcpreq->sg = sg; | |
2275 | fcpreq->sg_cnt = 0; | |
2276 | while (tlen < remaininglen && | |
2277 | fcpreq->sg_cnt < tgtport->max_sg_cnt && | |
2278 | tlen + sg_dma_len(sg) < NVMET_FC_MAX_SEQ_LENGTH) { | |
2279 | fcpreq->sg_cnt++; | |
2280 | tlen += sg_dma_len(sg); | |
2281 | sg = sg_next(sg); | |
2282 | } | |
2283 | if (tlen < remaininglen && fcpreq->sg_cnt == 0) { | |
2284 | fcpreq->sg_cnt++; | |
2285 | tlen += min_t(u32, sg_dma_len(sg), remaininglen); | |
2286 | sg = sg_next(sg); | |
2287 | } | |
2288 | if (tlen < remaininglen) | |
2289 | fod->next_sg = sg; | |
2290 | else | |
2291 | fod->next_sg = NULL; | |
2292 | ||
c5343203 JS |
2293 | fcpreq->transfer_length = tlen; |
2294 | fcpreq->transferred_length = 0; | |
2295 | fcpreq->fcp_error = 0; | |
2296 | fcpreq->rsplen = 0; | |
2297 | ||
c5343203 JS |
2298 | /* |
2299 | * If the last READDATA request: check if LLDD supports | |
2300 | * combined xfr with response. | |
2301 | */ | |
2302 | if ((op == NVMET_FCOP_READDATA) && | |
5e62d5c9 | 2303 | ((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) && |
c5343203 JS |
2304 | (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) { |
2305 | fcpreq->op = NVMET_FCOP_READDATA_RSP; | |
2306 | nvmet_fc_prep_fcp_rsp(tgtport, fod); | |
2307 | } | |
2308 | ||
2309 | ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); | |
2310 | if (ret) { | |
2311 | /* | |
2312 | * should be ok to set w/o lock as its in the thread of | |
2313 | * execution (not an async timer routine) and doesn't | |
2314 | * contend with any clearing action | |
2315 | */ | |
2316 | fod->abort = true; | |
2317 | ||
a97ec51b JS |
2318 | if (op == NVMET_FCOP_WRITEDATA) { |
2319 | spin_lock_irqsave(&fod->flock, flags); | |
2320 | fod->writedataactive = false; | |
2321 | spin_unlock_irqrestore(&fod->flock, flags); | |
29b3d26e | 2322 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
a97ec51b | 2323 | } else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ { |
c5343203 JS |
2324 | fcpreq->fcp_error = ret; |
2325 | fcpreq->transferred_length = 0; | |
2326 | nvmet_fc_xmt_fcp_op_done(fod->fcpreq); | |
2327 | } | |
2328 | } | |
2329 | } | |
2330 | ||
a97ec51b JS |
2331 | static inline bool |
2332 | __nvmet_fc_fod_op_abort(struct nvmet_fc_fcp_iod *fod, bool abort) | |
2333 | { | |
2334 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
2335 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
2336 | ||
2337 | /* if in the middle of an io and we need to tear down */ | |
2338 | if (abort) { | |
2339 | if (fcpreq->op == NVMET_FCOP_WRITEDATA) { | |
29b3d26e | 2340 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
a97ec51b JS |
2341 | return true; |
2342 | } | |
2343 | ||
2344 | nvmet_fc_abort_op(tgtport, fod); | |
2345 | return true; | |
2346 | } | |
2347 | ||
2348 | return false; | |
2349 | } | |
2350 | ||
39498fae JS |
2351 | /* |
2352 | * actual done handler for FCP operations when completed by the lldd | |
2353 | */ | |
c5343203 | 2354 | static void |
39498fae | 2355 | nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) |
c5343203 | 2356 | { |
39498fae | 2357 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; |
c5343203 JS |
2358 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; |
2359 | unsigned long flags; | |
2360 | bool abort; | |
2361 | ||
2362 | spin_lock_irqsave(&fod->flock, flags); | |
2363 | abort = fod->abort; | |
a97ec51b | 2364 | fod->writedataactive = false; |
c5343203 JS |
2365 | spin_unlock_irqrestore(&fod->flock, flags); |
2366 | ||
c5343203 JS |
2367 | switch (fcpreq->op) { |
2368 | ||
2369 | case NVMET_FCOP_WRITEDATA: | |
a97ec51b JS |
2370 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2371 | return; | |
f64935ab | 2372 | if (fcpreq->fcp_error || |
c5343203 | 2373 | fcpreq->transferred_length != fcpreq->transfer_length) { |
70e37988 | 2374 | spin_lock_irqsave(&fod->flock, flags); |
a97ec51b | 2375 | fod->abort = true; |
70e37988 | 2376 | spin_unlock_irqrestore(&fod->flock, flags); |
a97ec51b | 2377 | |
29b3d26e | 2378 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
c5343203 JS |
2379 | return; |
2380 | } | |
2381 | ||
2382 | fod->offset += fcpreq->transferred_length; | |
5e62d5c9 | 2383 | if (fod->offset != fod->req.transfer_len) { |
a97ec51b JS |
2384 | spin_lock_irqsave(&fod->flock, flags); |
2385 | fod->writedataactive = true; | |
2386 | spin_unlock_irqrestore(&fod->flock, flags); | |
2387 | ||
c5343203 JS |
2388 | /* transfer the next chunk */ |
2389 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2390 | NVMET_FCOP_WRITEDATA); | |
2391 | return; | |
2392 | } | |
2393 | ||
2394 | /* data transfer complete, resume with nvmet layer */ | |
be3f3114 | 2395 | fod->req.execute(&fod->req); |
c5343203 JS |
2396 | break; |
2397 | ||
2398 | case NVMET_FCOP_READDATA: | |
2399 | case NVMET_FCOP_READDATA_RSP: | |
a97ec51b JS |
2400 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2401 | return; | |
f64935ab | 2402 | if (fcpreq->fcp_error || |
c5343203 | 2403 | fcpreq->transferred_length != fcpreq->transfer_length) { |
a97ec51b | 2404 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2405 | return; |
2406 | } | |
2407 | ||
2408 | /* success */ | |
2409 | ||
2410 | if (fcpreq->op == NVMET_FCOP_READDATA_RSP) { | |
2411 | /* data no longer needed */ | |
2412 | nvmet_fc_free_tgt_pgs(fod); | |
c5343203 JS |
2413 | nvmet_fc_free_fcp_iod(fod->queue, fod); |
2414 | return; | |
2415 | } | |
2416 | ||
2417 | fod->offset += fcpreq->transferred_length; | |
5e62d5c9 | 2418 | if (fod->offset != fod->req.transfer_len) { |
c5343203 JS |
2419 | /* transfer the next chunk */ |
2420 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2421 | NVMET_FCOP_READDATA); | |
2422 | return; | |
2423 | } | |
2424 | ||
2425 | /* data transfer complete, send response */ | |
2426 | ||
2427 | /* data no longer needed */ | |
2428 | nvmet_fc_free_tgt_pgs(fod); | |
2429 | ||
2430 | nvmet_fc_xmt_fcp_rsp(tgtport, fod); | |
2431 | ||
2432 | break; | |
2433 | ||
2434 | case NVMET_FCOP_RSP: | |
a97ec51b JS |
2435 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2436 | return; | |
c5343203 JS |
2437 | nvmet_fc_free_fcp_iod(fod->queue, fod); |
2438 | break; | |
2439 | ||
2440 | default: | |
c5343203 JS |
2441 | break; |
2442 | } | |
2443 | } | |
2444 | ||
39498fae JS |
2445 | static void |
2446 | nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq) | |
2447 | { | |
2448 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
39498fae | 2449 | |
6e2e312e | 2450 | nvmet_fc_fod_op_done(fod); |
39498fae JS |
2451 | } |
2452 | ||
c5343203 JS |
2453 | /* |
2454 | * actual completion handler after execution by the nvmet layer | |
2455 | */ | |
2456 | static void | |
2457 | __nvmet_fc_fcp_nvme_cmd_done(struct nvmet_fc_tgtport *tgtport, | |
2458 | struct nvmet_fc_fcp_iod *fod, int status) | |
2459 | { | |
2460 | struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; | |
2461 | struct nvme_completion *cqe = &fod->rspiubuf.cqe; | |
2462 | unsigned long flags; | |
2463 | bool abort; | |
2464 | ||
2465 | spin_lock_irqsave(&fod->flock, flags); | |
2466 | abort = fod->abort; | |
2467 | spin_unlock_irqrestore(&fod->flock, flags); | |
2468 | ||
2469 | /* if we have a CQE, snoop the last sq_head value */ | |
2470 | if (!status) | |
2471 | fod->queue->sqhd = cqe->sq_head; | |
2472 | ||
2473 | if (abort) { | |
a97ec51b | 2474 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2475 | return; |
2476 | } | |
2477 | ||
2478 | /* if an error handling the cmd post initial parsing */ | |
2479 | if (status) { | |
2480 | /* fudge up a failed CQE status for our transport error */ | |
2481 | memset(cqe, 0, sizeof(*cqe)); | |
2482 | cqe->sq_head = fod->queue->sqhd; /* echo last cqe sqhd */ | |
2483 | cqe->sq_id = cpu_to_le16(fod->queue->qid); | |
2484 | cqe->command_id = sqe->command_id; | |
2485 | cqe->status = cpu_to_le16(status); | |
2486 | } else { | |
2487 | ||
2488 | /* | |
2489 | * try to push the data even if the SQE status is non-zero. | |
2490 | * There may be a status where data still was intended to | |
2491 | * be moved | |
2492 | */ | |
2493 | if ((fod->io_dir == NVMET_FCP_READ) && (fod->data_sg_cnt)) { | |
2494 | /* push the data over before sending rsp */ | |
2495 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2496 | NVMET_FCOP_READDATA); | |
2497 | return; | |
2498 | } | |
2499 | ||
2500 | /* writes & no data - fall thru */ | |
2501 | } | |
2502 | ||
2503 | /* data no longer needed */ | |
2504 | nvmet_fc_free_tgt_pgs(fod); | |
2505 | ||
2506 | nvmet_fc_xmt_fcp_rsp(tgtport, fod); | |
2507 | } | |
2508 | ||
2509 | ||
2510 | static void | |
2511 | nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req) | |
2512 | { | |
2513 | struct nvmet_fc_fcp_iod *fod = nvmet_req_to_fod(nvme_req); | |
2514 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
2515 | ||
2516 | __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, 0); | |
2517 | } | |
2518 | ||
2519 | ||
2520 | /* | |
ea96d649 | 2521 | * Actual processing routine for received FC-NVME I/O Requests from the LLD |
c5343203 | 2522 | */ |
edba98dd | 2523 | static void |
c5343203 JS |
2524 | nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, |
2525 | struct nvmet_fc_fcp_iod *fod) | |
2526 | { | |
2527 | struct nvme_fc_cmd_iu *cmdiu = &fod->cmdiubuf; | |
cce75291 | 2528 | u32 xfrlen = be32_to_cpu(cmdiu->data_len); |
c5343203 JS |
2529 | int ret; |
2530 | ||
2531 | /* | |
2532 | * Fused commands are currently not supported in the linux | |
2533 | * implementation. | |
2534 | * | |
2535 | * As such, the implementation of the FC transport does not | |
2536 | * look at the fused commands and order delivery to the upper | |
2537 | * layer until we have both based on csn. | |
2538 | */ | |
2539 | ||
2540 | fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done; | |
2541 | ||
c5343203 JS |
2542 | if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) { |
2543 | fod->io_dir = NVMET_FCP_WRITE; | |
2544 | if (!nvme_is_write(&cmdiu->sqe)) | |
2545 | goto transport_error; | |
2546 | } else if (cmdiu->flags & FCNVME_CMD_FLAGS_READ) { | |
2547 | fod->io_dir = NVMET_FCP_READ; | |
2548 | if (nvme_is_write(&cmdiu->sqe)) | |
2549 | goto transport_error; | |
2550 | } else { | |
2551 | fod->io_dir = NVMET_FCP_NODATA; | |
cce75291 | 2552 | if (xfrlen) |
c5343203 JS |
2553 | goto transport_error; |
2554 | } | |
2555 | ||
2556 | fod->req.cmd = &fod->cmdiubuf.sqe; | |
fc6c9730 | 2557 | fod->req.cqe = &fod->rspiubuf.cqe; |
3146345c DW |
2558 | if (!tgtport->pe) |
2559 | goto transport_error; | |
2560 | fod->req.port = tgtport->pe->port; | |
c5343203 | 2561 | |
c5343203 JS |
2562 | /* clear any response payload */ |
2563 | memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf)); | |
2564 | ||
188f7e8a JS |
2565 | fod->data_sg = NULL; |
2566 | fod->data_sg_cnt = 0; | |
2567 | ||
c5343203 JS |
2568 | ret = nvmet_req_init(&fod->req, |
2569 | &fod->queue->nvme_cq, | |
2570 | &fod->queue->nvme_sq, | |
2571 | &nvmet_fc_tgt_fcp_ops); | |
188f7e8a JS |
2572 | if (!ret) { |
2573 | /* bad SQE content or invalid ctrl state */ | |
2574 | /* nvmet layer has already called op done to send rsp. */ | |
c5343203 JS |
2575 | return; |
2576 | } | |
2577 | ||
cce75291 JS |
2578 | fod->req.transfer_len = xfrlen; |
2579 | ||
c5343203 JS |
2580 | /* keep a running counter of tail position */ |
2581 | atomic_inc(&fod->queue->sqtail); | |
2582 | ||
5e62d5c9 | 2583 | if (fod->req.transfer_len) { |
c5343203 JS |
2584 | ret = nvmet_fc_alloc_tgt_pgs(fod); |
2585 | if (ret) { | |
2586 | nvmet_req_complete(&fod->req, ret); | |
2587 | return; | |
2588 | } | |
2589 | } | |
2590 | fod->req.sg = fod->data_sg; | |
2591 | fod->req.sg_cnt = fod->data_sg_cnt; | |
2592 | fod->offset = 0; | |
c5343203 JS |
2593 | |
2594 | if (fod->io_dir == NVMET_FCP_WRITE) { | |
2595 | /* pull the data over before invoking nvmet layer */ | |
2596 | nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_WRITEDATA); | |
2597 | return; | |
2598 | } | |
2599 | ||
2600 | /* | |
2601 | * Reads or no data: | |
2602 | * | |
2603 | * can invoke the nvmet_layer now. If read data, cmd completion will | |
2604 | * push the data | |
2605 | */ | |
be3f3114 | 2606 | fod->req.execute(&fod->req); |
c5343203 JS |
2607 | return; |
2608 | ||
2609 | transport_error: | |
a97ec51b | 2610 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2611 | } |
2612 | ||
c5343203 JS |
2613 | /** |
2614 | * nvmet_fc_rcv_fcp_req - transport entry point called by an LLDD | |
2615 | * upon the reception of a NVME FCP CMD IU. | |
2616 | * | |
2617 | * Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc | |
2618 | * layer for processing. | |
2619 | * | |
0fb228d3 JS |
2620 | * The nvmet_fc layer allocates a local job structure (struct |
2621 | * nvmet_fc_fcp_iod) from the queue for the io and copies the | |
2622 | * CMD IU buffer to the job structure. As such, on a successful | |
2623 | * completion (returns 0), the LLDD may immediately free/reuse | |
2624 | * the CMD IU buffer passed in the call. | |
2625 | * | |
2626 | * However, in some circumstances, due to the packetized nature of FC | |
2627 | * and the api of the FC LLDD which may issue a hw command to send the | |
2628 | * response, but the LLDD may not get the hw completion for that command | |
2629 | * and upcall the nvmet_fc layer before a new command may be | |
2630 | * asynchronously received - its possible for a command to be received | |
2631 | * before the LLDD and nvmet_fc have recycled the job structure. It gives | |
2632 | * the appearance of more commands received than fits in the sq. | |
2633 | * To alleviate this scenario, a temporary queue is maintained in the | |
2634 | * transport for pending LLDD requests waiting for a queue job structure. | |
2635 | * In these "overrun" cases, a temporary queue element is allocated | |
2636 | * the LLDD request and CMD iu buffer information remembered, and the | |
2637 | * routine returns a -EOVERFLOW status. Subsequently, when a queue job | |
2638 | * structure is freed, it is immediately reallocated for anything on the | |
2639 | * pending request list. The LLDDs defer_rcv() callback is called, | |
2640 | * informing the LLDD that it may reuse the CMD IU buffer, and the io | |
2641 | * is then started normally with the transport. | |
c5343203 | 2642 | * |
0fb228d3 JS |
2643 | * The LLDD, when receiving an -EOVERFLOW completion status, is to treat |
2644 | * the completion as successful but must not reuse the CMD IU buffer | |
2645 | * until the LLDD's defer_rcv() callback has been called for the | |
2646 | * corresponding struct nvmefc_tgt_fcp_req pointer. | |
2647 | * | |
2648 | * If there is any other condition in which an error occurs, the | |
2649 | * transport will return a non-zero status indicating the error. | |
2650 | * In all cases other than -EOVERFLOW, the transport has not accepted the | |
2651 | * request and the LLDD should abort the exchange. | |
c5343203 JS |
2652 | * |
2653 | * @target_port: pointer to the (registered) target port the FCP CMD IU | |
19b58d94 | 2654 | * was received on. |
c5343203 JS |
2655 | * @fcpreq: pointer to a fcpreq request structure to be used to reference |
2656 | * the exchange corresponding to the FCP Exchange. | |
2657 | * @cmdiubuf: pointer to the buffer containing the FCP CMD IU | |
2658 | * @cmdiubuf_len: length, in bytes, of the received FCP CMD IU | |
2659 | */ | |
2660 | int | |
2661 | nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port, | |
2662 | struct nvmefc_tgt_fcp_req *fcpreq, | |
2663 | void *cmdiubuf, u32 cmdiubuf_len) | |
2664 | { | |
2665 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
2666 | struct nvme_fc_cmd_iu *cmdiu = cmdiubuf; | |
2667 | struct nvmet_fc_tgt_queue *queue; | |
2668 | struct nvmet_fc_fcp_iod *fod; | |
0fb228d3 JS |
2669 | struct nvmet_fc_defer_fcp_req *deferfcp; |
2670 | unsigned long flags; | |
c5343203 JS |
2671 | |
2672 | /* validate iu, so the connection id can be used to find the queue */ | |
2673 | if ((cmdiubuf_len != sizeof(*cmdiu)) || | |
53b2b2f5 | 2674 | (cmdiu->format_id != NVME_CMD_FORMAT_ID) || |
c5343203 JS |
2675 | (cmdiu->fc_id != NVME_CMD_FC_ID) || |
2676 | (be16_to_cpu(cmdiu->iu_len) != (sizeof(*cmdiu)/4))) | |
2677 | return -EIO; | |
2678 | ||
c5343203 JS |
2679 | queue = nvmet_fc_find_target_queue(tgtport, |
2680 | be64_to_cpu(cmdiu->connection_id)); | |
2681 | if (!queue) | |
2682 | return -ENOTCONN; | |
2683 | ||
2684 | /* | |
2685 | * note: reference taken by find_target_queue | |
2686 | * After successful fod allocation, the fod will inherit the | |
2687 | * ownership of that reference and will remove the reference | |
2688 | * when the fod is freed. | |
2689 | */ | |
2690 | ||
0fb228d3 JS |
2691 | spin_lock_irqsave(&queue->qlock, flags); |
2692 | ||
c5343203 | 2693 | fod = nvmet_fc_alloc_fcp_iod(queue); |
0fb228d3 JS |
2694 | if (fod) { |
2695 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2696 | ||
2697 | fcpreq->nvmet_fc_private = fod; | |
2698 | fod->fcpreq = fcpreq; | |
2699 | ||
2700 | memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len); | |
2701 | ||
2702 | nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq); | |
2703 | ||
2704 | return 0; | |
2705 | } | |
2706 | ||
2707 | if (!tgtport->ops->defer_rcv) { | |
2708 | spin_unlock_irqrestore(&queue->qlock, flags); | |
c5343203 JS |
2709 | /* release the queue lookup reference */ |
2710 | nvmet_fc_tgt_q_put(queue); | |
2711 | return -ENOENT; | |
2712 | } | |
2713 | ||
0fb228d3 JS |
2714 | deferfcp = list_first_entry_or_null(&queue->avail_defer_list, |
2715 | struct nvmet_fc_defer_fcp_req, req_list); | |
2716 | if (deferfcp) { | |
2717 | /* Just re-use one that was previously allocated */ | |
2718 | list_del(&deferfcp->req_list); | |
2719 | } else { | |
2720 | spin_unlock_irqrestore(&queue->qlock, flags); | |
c5343203 | 2721 | |
0fb228d3 JS |
2722 | /* Now we need to dynamically allocate one */ |
2723 | deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL); | |
2724 | if (!deferfcp) { | |
2725 | /* release the queue lookup reference */ | |
2726 | nvmet_fc_tgt_q_put(queue); | |
2727 | return -ENOMEM; | |
2728 | } | |
2729 | spin_lock_irqsave(&queue->qlock, flags); | |
2730 | } | |
c5343203 | 2731 | |
0fb228d3 JS |
2732 | /* For now, use rspaddr / rsplen to save payload information */ |
2733 | fcpreq->rspaddr = cmdiubuf; | |
2734 | fcpreq->rsplen = cmdiubuf_len; | |
2735 | deferfcp->fcp_req = fcpreq; | |
2736 | ||
2737 | /* defer processing till a fod becomes available */ | |
2738 | list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list); | |
2739 | ||
2740 | /* NOTE: the queue lookup reference is still valid */ | |
2741 | ||
2742 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2743 | ||
2744 | return -EOVERFLOW; | |
c5343203 JS |
2745 | } |
2746 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req); | |
2747 | ||
a97ec51b JS |
2748 | /** |
2749 | * nvmet_fc_rcv_fcp_abort - transport entry point called by an LLDD | |
2750 | * upon the reception of an ABTS for a FCP command | |
2751 | * | |
2752 | * Notify the transport that an ABTS has been received for a FCP command | |
2753 | * that had been given to the transport via nvmet_fc_rcv_fcp_req(). The | |
2754 | * LLDD believes the command is still being worked on | |
2755 | * (template_ops->fcp_req_release() has not been called). | |
2756 | * | |
2757 | * The transport will wait for any outstanding work (an op to the LLDD, | |
2758 | * which the lldd should complete with error due to the ABTS; or the | |
2759 | * completion from the nvmet layer of the nvme command), then will | |
2760 | * stop processing and call the nvmet_fc_rcv_fcp_req() callback to | |
2761 | * return the i/o context to the LLDD. The LLDD may send the BA_ACC | |
2762 | * to the ABTS either after return from this function (assuming any | |
2763 | * outstanding op work has been terminated) or upon the callback being | |
2764 | * called. | |
2765 | * | |
2766 | * @target_port: pointer to the (registered) target port the FCP CMD IU | |
2767 | * was received on. | |
2768 | * @fcpreq: pointer to the fcpreq request structure that corresponds | |
2769 | * to the exchange that received the ABTS. | |
2770 | */ | |
2771 | void | |
2772 | nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port, | |
2773 | struct nvmefc_tgt_fcp_req *fcpreq) | |
2774 | { | |
2775 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
2776 | struct nvmet_fc_tgt_queue *queue; | |
2777 | unsigned long flags; | |
2778 | ||
2779 | if (!fod || fod->fcpreq != fcpreq) | |
2780 | /* job appears to have already completed, ignore abort */ | |
2781 | return; | |
2782 | ||
2783 | queue = fod->queue; | |
2784 | ||
2785 | spin_lock_irqsave(&queue->qlock, flags); | |
2786 | if (fod->active) { | |
2787 | /* | |
2788 | * mark as abort. The abort handler, invoked upon completion | |
2789 | * of any work, will detect the aborted status and do the | |
2790 | * callback. | |
2791 | */ | |
2792 | spin_lock(&fod->flock); | |
2793 | fod->abort = true; | |
2794 | fod->aborted = true; | |
2795 | spin_unlock(&fod->flock); | |
2796 | } | |
2797 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2798 | } | |
2799 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort); | |
2800 | ||
c5343203 JS |
2801 | |
2802 | struct nvmet_fc_traddr { | |
2803 | u64 nn; | |
2804 | u64 pn; | |
2805 | }; | |
2806 | ||
c5343203 | 2807 | static int |
9c5358e1 | 2808 | __nvme_fc_parse_u64(substring_t *sstr, u64 *val) |
c5343203 | 2809 | { |
c5343203 JS |
2810 | u64 token64; |
2811 | ||
9c5358e1 JS |
2812 | if (match_u64(sstr, &token64)) |
2813 | return -EINVAL; | |
2814 | *val = token64; | |
c5343203 | 2815 | |
9c5358e1 JS |
2816 | return 0; |
2817 | } | |
c5343203 | 2818 | |
9c5358e1 JS |
2819 | /* |
2820 | * This routine validates and extracts the WWN's from the TRADDR string. | |
2821 | * As kernel parsers need the 0x to determine number base, universally | |
2822 | * build string to parse with 0x prefix before parsing name strings. | |
2823 | */ | |
2824 | static int | |
2825 | nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen) | |
2826 | { | |
2827 | char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1]; | |
2828 | substring_t wwn = { name, &name[sizeof(name)-1] }; | |
2829 | int nnoffset, pnoffset; | |
2830 | ||
d4e4230c | 2831 | /* validate if string is one of the 2 allowed formats */ |
9c5358e1 JS |
2832 | if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH && |
2833 | !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) && | |
2834 | !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET], | |
2835 | "pn-0x", NVME_FC_TRADDR_OXNNLEN)) { | |
2836 | nnoffset = NVME_FC_TRADDR_OXNNLEN; | |
2837 | pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET + | |
2838 | NVME_FC_TRADDR_OXNNLEN; | |
2839 | } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH && | |
2840 | !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) && | |
2841 | !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET], | |
2842 | "pn-", NVME_FC_TRADDR_NNLEN))) { | |
2843 | nnoffset = NVME_FC_TRADDR_NNLEN; | |
2844 | pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN; | |
2845 | } else | |
2846 | goto out_einval; | |
2847 | ||
2848 | name[0] = '0'; | |
2849 | name[1] = 'x'; | |
2850 | name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0; | |
2851 | ||
2852 | memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN); | |
2853 | if (__nvme_fc_parse_u64(&wwn, &traddr->nn)) | |
2854 | goto out_einval; | |
2855 | ||
2856 | memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN); | |
2857 | if (__nvme_fc_parse_u64(&wwn, &traddr->pn)) | |
2858 | goto out_einval; | |
c5343203 | 2859 | |
9c5358e1 JS |
2860 | return 0; |
2861 | ||
2862 | out_einval: | |
2863 | pr_warn("%s: bad traddr string\n", __func__); | |
2864 | return -EINVAL; | |
c5343203 JS |
2865 | } |
2866 | ||
2867 | static int | |
2868 | nvmet_fc_add_port(struct nvmet_port *port) | |
2869 | { | |
2870 | struct nvmet_fc_tgtport *tgtport; | |
ea96d649 | 2871 | struct nvmet_fc_port_entry *pe; |
c5343203 JS |
2872 | struct nvmet_fc_traddr traddr = { 0L, 0L }; |
2873 | unsigned long flags; | |
2874 | int ret; | |
2875 | ||
2876 | /* validate the address info */ | |
2877 | if ((port->disc_addr.trtype != NVMF_TRTYPE_FC) || | |
2878 | (port->disc_addr.adrfam != NVMF_ADDR_FAMILY_FC)) | |
2879 | return -EINVAL; | |
2880 | ||
2881 | /* map the traddr address info to a target port */ | |
2882 | ||
9c5358e1 JS |
2883 | ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr, |
2884 | sizeof(port->disc_addr.traddr)); | |
c5343203 JS |
2885 | if (ret) |
2886 | return ret; | |
2887 | ||
ea96d649 JS |
2888 | pe = kzalloc(sizeof(*pe), GFP_KERNEL); |
2889 | if (!pe) | |
2890 | return -ENOMEM; | |
2891 | ||
c5343203 JS |
2892 | ret = -ENXIO; |
2893 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
2894 | list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) { | |
2895 | if ((tgtport->fc_target_port.node_name == traddr.nn) && | |
2896 | (tgtport->fc_target_port.port_name == traddr.pn)) { | |
ea96d649 JS |
2897 | /* a FC port can only be 1 nvmet port id */ |
2898 | if (!tgtport->pe) { | |
2899 | nvmet_fc_portentry_bind(tgtport, pe, port); | |
2900 | ret = 0; | |
2901 | } else | |
2902 | ret = -EALREADY; | |
c5343203 JS |
2903 | break; |
2904 | } | |
2905 | } | |
2906 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
ea96d649 JS |
2907 | |
2908 | if (ret) | |
2909 | kfree(pe); | |
2910 | ||
c5343203 JS |
2911 | return ret; |
2912 | } | |
2913 | ||
2914 | static void | |
2915 | nvmet_fc_remove_port(struct nvmet_port *port) | |
2916 | { | |
ea96d649 JS |
2917 | struct nvmet_fc_port_entry *pe = port->priv; |
2918 | ||
2919 | nvmet_fc_portentry_unbind(pe); | |
2920 | ||
4049dc96 DW |
2921 | /* terminate any outstanding associations */ |
2922 | __nvmet_fc_free_assocs(pe->tgtport); | |
2923 | ||
ea96d649 | 2924 | kfree(pe); |
c5343203 JS |
2925 | } |
2926 | ||
150d71f7 JS |
2927 | static void |
2928 | nvmet_fc_discovery_chg(struct nvmet_port *port) | |
2929 | { | |
2930 | struct nvmet_fc_port_entry *pe = port->priv; | |
2931 | struct nvmet_fc_tgtport *tgtport = pe->tgtport; | |
2932 | ||
2933 | if (tgtport && tgtport->ops->discovery_event) | |
2934 | tgtport->ops->discovery_event(&tgtport->fc_target_port); | |
2935 | } | |
2936 | ||
e929f06d | 2937 | static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = { |
c5343203 JS |
2938 | .owner = THIS_MODULE, |
2939 | .type = NVMF_TRTYPE_FC, | |
2940 | .msdbd = 1, | |
2941 | .add_port = nvmet_fc_add_port, | |
2942 | .remove_port = nvmet_fc_remove_port, | |
2943 | .queue_response = nvmet_fc_fcp_nvme_cmd_done, | |
2944 | .delete_ctrl = nvmet_fc_delete_ctrl, | |
150d71f7 | 2945 | .discovery_chg = nvmet_fc_discovery_chg, |
c5343203 JS |
2946 | }; |
2947 | ||
2948 | static int __init nvmet_fc_init_module(void) | |
2949 | { | |
2950 | return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops); | |
2951 | } | |
2952 | ||
2953 | static void __exit nvmet_fc_exit_module(void) | |
2954 | { | |
4049dc96 DW |
2955 | /* ensure any shutdown operation, e.g. delete ctrls have finished */ |
2956 | flush_workqueue(nvmet_wq); | |
2957 | ||
c5343203 JS |
2958 | /* sanity check - all lports should be removed */ |
2959 | if (!list_empty(&nvmet_fc_target_list)) | |
2960 | pr_warn("%s: targetport list not empty\n", __func__); | |
2961 | ||
2962 | nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops); | |
2963 | ||
2964 | ida_destroy(&nvmet_fc_tgtport_cnt); | |
2965 | } | |
2966 | ||
2967 | module_init(nvmet_fc_init_module); | |
2968 | module_exit(nvmet_fc_exit_module); | |
2969 | ||
41951f83 | 2970 | MODULE_DESCRIPTION("NVMe target FC transport driver"); |
c5343203 | 2971 | MODULE_LICENSE("GPL v2"); |