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; |
c5343203 JS |
114 | }; |
115 | ||
ea96d649 JS |
116 | struct nvmet_fc_port_entry { |
117 | struct nvmet_fc_tgtport *tgtport; | |
118 | struct nvmet_port *port; | |
119 | u64 node_name; | |
120 | u64 port_name; | |
121 | struct list_head pe_list; | |
122 | }; | |
123 | ||
0fb228d3 JS |
124 | struct nvmet_fc_defer_fcp_req { |
125 | struct list_head req_list; | |
126 | struct nvmefc_tgt_fcp_req *fcp_req; | |
127 | }; | |
128 | ||
c5343203 JS |
129 | struct nvmet_fc_tgt_queue { |
130 | bool ninetypercent; | |
131 | u16 qid; | |
132 | u16 sqsize; | |
133 | u16 ersp_ratio; | |
f63688a6 | 134 | __le16 sqhd; |
c5343203 JS |
135 | atomic_t connected; |
136 | atomic_t sqtail; | |
137 | atomic_t zrspcnt; | |
138 | atomic_t rsn; | |
139 | spinlock_t qlock; | |
c5343203 JS |
140 | struct nvmet_cq nvme_cq; |
141 | struct nvmet_sq nvme_sq; | |
142 | struct nvmet_fc_tgt_assoc *assoc; | |
c5343203 | 143 | struct list_head fod_list; |
0fb228d3 JS |
144 | struct list_head pending_cmd_list; |
145 | struct list_head avail_defer_list; | |
c5343203 JS |
146 | struct workqueue_struct *work_q; |
147 | struct kref ref; | |
4e2f02bf | 148 | struct rcu_head rcu; |
6b80f1d2 | 149 | struct nvmet_fc_fcp_iod fod[]; /* array of fcp_iods */ |
c5343203 JS |
150 | } __aligned(sizeof(unsigned long long)); |
151 | ||
58ab8ff9 JS |
152 | struct nvmet_fc_hostport { |
153 | struct nvmet_fc_tgtport *tgtport; | |
154 | void *hosthandle; | |
155 | struct list_head host_list; | |
156 | struct kref ref; | |
157 | u8 invalid; | |
158 | }; | |
159 | ||
c5343203 JS |
160 | struct nvmet_fc_tgt_assoc { |
161 | u64 association_id; | |
162 | u32 a_id; | |
47bf3241 | 163 | atomic_t terminating; |
c5343203 | 164 | struct nvmet_fc_tgtport *tgtport; |
58ab8ff9 | 165 | struct nvmet_fc_hostport *hostport; |
47bf3241 | 166 | struct nvmet_fc_ls_iod *rcv_disconn; |
c5343203 | 167 | struct list_head a_list; |
b5df8e79 | 168 | struct nvmet_fc_tgt_queue __rcu *queues[NVMET_NR_QUEUES + 1]; |
c5343203 | 169 | struct kref ref; |
a96d4bd8 | 170 | struct work_struct del_work; |
4e2f02bf | 171 | struct rcu_head rcu; |
c5343203 JS |
172 | }; |
173 | ||
174 | ||
175 | static inline int | |
176 | nvmet_fc_iodnum(struct nvmet_fc_ls_iod *iodptr) | |
177 | { | |
178 | return (iodptr - iodptr->tgtport->iod); | |
179 | } | |
180 | ||
181 | static inline int | |
182 | nvmet_fc_fodnum(struct nvmet_fc_fcp_iod *fodptr) | |
183 | { | |
184 | return (fodptr - fodptr->queue->fod); | |
185 | } | |
186 | ||
187 | ||
188 | /* | |
189 | * Association and Connection IDs: | |
190 | * | |
191 | * Association ID will have random number in upper 6 bytes and zero | |
192 | * in lower 2 bytes | |
193 | * | |
194 | * Connection IDs will be Association ID with QID or'd in lower 2 bytes | |
195 | * | |
196 | * note: Association ID = Connection ID for queue 0 | |
197 | */ | |
198 | #define BYTES_FOR_QID sizeof(u16) | |
199 | #define BYTES_FOR_QID_SHIFT (BYTES_FOR_QID * 8) | |
200 | #define NVMET_FC_QUEUEID_MASK ((u64)((1 << BYTES_FOR_QID_SHIFT) - 1)) | |
201 | ||
202 | static inline u64 | |
203 | nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid) | |
204 | { | |
205 | return (assoc->association_id | qid); | |
206 | } | |
207 | ||
208 | static inline u64 | |
209 | nvmet_fc_getassociationid(u64 connectionid) | |
210 | { | |
211 | return connectionid & ~NVMET_FC_QUEUEID_MASK; | |
212 | } | |
213 | ||
214 | static inline u16 | |
215 | nvmet_fc_getqueueid(u64 connectionid) | |
216 | { | |
217 | return (u16)(connectionid & NVMET_FC_QUEUEID_MASK); | |
218 | } | |
219 | ||
220 | static inline struct nvmet_fc_tgtport * | |
221 | targetport_to_tgtport(struct nvmet_fc_target_port *targetport) | |
222 | { | |
223 | return container_of(targetport, struct nvmet_fc_tgtport, | |
224 | fc_target_port); | |
225 | } | |
226 | ||
227 | static inline struct nvmet_fc_fcp_iod * | |
228 | nvmet_req_to_fod(struct nvmet_req *nvme_req) | |
229 | { | |
230 | return container_of(nvme_req, struct nvmet_fc_fcp_iod, req); | |
231 | } | |
232 | ||
233 | ||
234 | /* *************************** Globals **************************** */ | |
235 | ||
236 | ||
237 | static DEFINE_SPINLOCK(nvmet_fc_tgtlock); | |
238 | ||
239 | static LIST_HEAD(nvmet_fc_target_list); | |
240 | static DEFINE_IDA(nvmet_fc_tgtport_cnt); | |
ea96d649 | 241 | static LIST_HEAD(nvmet_fc_portentry_list); |
c5343203 JS |
242 | |
243 | ||
244 | static void nvmet_fc_handle_ls_rqst_work(struct work_struct *work); | |
9d625f77 | 245 | static void nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work); |
c5343203 JS |
246 | static void nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc); |
247 | static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc); | |
248 | static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue); | |
249 | static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue); | |
250 | static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport); | |
251 | static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport); | |
0fb228d3 JS |
252 | static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, |
253 | struct nvmet_fc_fcp_iod *fod); | |
a96d4bd8 | 254 | static void nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc); |
47bf3241 JS |
255 | static void nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, |
256 | struct nvmet_fc_ls_iod *iod); | |
c5343203 JS |
257 | |
258 | ||
259 | /* *********************** FC-NVME DMA Handling **************************** */ | |
260 | ||
261 | /* | |
262 | * The fcloop device passes in a NULL device pointer. Real LLD's will | |
263 | * pass in a valid device pointer. If NULL is passed to the dma mapping | |
264 | * routines, depending on the platform, it may or may not succeed, and | |
265 | * may crash. | |
266 | * | |
267 | * As such: | |
268 | * Wrapper all the dma routines and check the dev pointer. | |
269 | * | |
270 | * If simple mappings (return just a dma address, we'll noop them, | |
271 | * returning a dma address of 0. | |
272 | * | |
273 | * On more complex mappings (dma_map_sg), a pseudo routine fills | |
274 | * in the scatter list, setting all dma addresses to 0. | |
275 | */ | |
276 | ||
277 | static inline dma_addr_t | |
278 | fc_dma_map_single(struct device *dev, void *ptr, size_t size, | |
279 | enum dma_data_direction dir) | |
280 | { | |
281 | return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; | |
282 | } | |
283 | ||
284 | static inline int | |
285 | fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) | |
286 | { | |
287 | return dev ? dma_mapping_error(dev, dma_addr) : 0; | |
288 | } | |
289 | ||
290 | static inline void | |
291 | fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, | |
292 | enum dma_data_direction dir) | |
293 | { | |
294 | if (dev) | |
295 | dma_unmap_single(dev, addr, size, dir); | |
296 | } | |
297 | ||
298 | static inline void | |
299 | fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, | |
300 | enum dma_data_direction dir) | |
301 | { | |
302 | if (dev) | |
303 | dma_sync_single_for_cpu(dev, addr, size, dir); | |
304 | } | |
305 | ||
306 | static inline void | |
307 | fc_dma_sync_single_for_device(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_device(dev, addr, size, dir); | |
312 | } | |
313 | ||
314 | /* pseudo dma_map_sg call */ | |
315 | static int | |
316 | fc_map_sg(struct scatterlist *sg, int nents) | |
317 | { | |
318 | struct scatterlist *s; | |
319 | int i; | |
320 | ||
321 | WARN_ON(nents == 0 || sg[0].length == 0); | |
322 | ||
323 | for_each_sg(sg, s, nents, i) { | |
324 | s->dma_address = 0L; | |
325 | #ifdef CONFIG_NEED_SG_DMA_LENGTH | |
326 | s->dma_length = s->length; | |
327 | #endif | |
328 | } | |
329 | return nents; | |
330 | } | |
331 | ||
332 | static inline int | |
333 | fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, | |
334 | enum dma_data_direction dir) | |
335 | { | |
336 | return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); | |
337 | } | |
338 | ||
339 | static inline void | |
340 | fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, | |
341 | enum dma_data_direction dir) | |
342 | { | |
343 | if (dev) | |
344 | dma_unmap_sg(dev, sg, nents, dir); | |
345 | } | |
346 | ||
347 | ||
47bf3241 JS |
348 | /* ********************** FC-NVME LS XMT Handling ************************* */ |
349 | ||
350 | ||
351 | static void | |
352 | __nvmet_fc_finish_ls_req(struct nvmet_fc_ls_req_op *lsop) | |
353 | { | |
354 | struct nvmet_fc_tgtport *tgtport = lsop->tgtport; | |
355 | struct nvmefc_ls_req *lsreq = &lsop->ls_req; | |
356 | unsigned long flags; | |
357 | ||
358 | spin_lock_irqsave(&tgtport->lock, flags); | |
359 | ||
360 | if (!lsop->req_queued) { | |
361 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
362 | return; | |
363 | } | |
364 | ||
365 | list_del(&lsop->lsreq_list); | |
366 | ||
367 | lsop->req_queued = false; | |
368 | ||
369 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
370 | ||
371 | fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma, | |
372 | (lsreq->rqstlen + lsreq->rsplen), | |
373 | DMA_BIDIRECTIONAL); | |
374 | ||
375 | nvmet_fc_tgtport_put(tgtport); | |
376 | } | |
377 | ||
378 | static int | |
379 | __nvmet_fc_send_ls_req(struct nvmet_fc_tgtport *tgtport, | |
380 | struct nvmet_fc_ls_req_op *lsop, | |
381 | void (*done)(struct nvmefc_ls_req *req, int status)) | |
382 | { | |
383 | struct nvmefc_ls_req *lsreq = &lsop->ls_req; | |
384 | unsigned long flags; | |
385 | int ret = 0; | |
386 | ||
387 | if (!tgtport->ops->ls_req) | |
388 | return -EOPNOTSUPP; | |
389 | ||
390 | if (!nvmet_fc_tgtport_get(tgtport)) | |
391 | return -ESHUTDOWN; | |
392 | ||
393 | lsreq->done = done; | |
394 | lsop->req_queued = false; | |
395 | INIT_LIST_HEAD(&lsop->lsreq_list); | |
396 | ||
397 | lsreq->rqstdma = fc_dma_map_single(tgtport->dev, lsreq->rqstaddr, | |
398 | lsreq->rqstlen + lsreq->rsplen, | |
399 | DMA_BIDIRECTIONAL); | |
400 | if (fc_dma_mapping_error(tgtport->dev, lsreq->rqstdma)) { | |
401 | ret = -EFAULT; | |
402 | goto out_puttgtport; | |
403 | } | |
404 | lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen; | |
405 | ||
406 | spin_lock_irqsave(&tgtport->lock, flags); | |
407 | ||
408 | list_add_tail(&lsop->lsreq_list, &tgtport->ls_req_list); | |
409 | ||
410 | lsop->req_queued = true; | |
411 | ||
412 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
413 | ||
414 | ret = tgtport->ops->ls_req(&tgtport->fc_target_port, lsop->hosthandle, | |
415 | lsreq); | |
416 | if (ret) | |
417 | goto out_unlink; | |
418 | ||
419 | return 0; | |
420 | ||
421 | out_unlink: | |
422 | lsop->ls_error = ret; | |
423 | spin_lock_irqsave(&tgtport->lock, flags); | |
424 | lsop->req_queued = false; | |
425 | list_del(&lsop->lsreq_list); | |
426 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
427 | fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma, | |
428 | (lsreq->rqstlen + lsreq->rsplen), | |
429 | DMA_BIDIRECTIONAL); | |
430 | out_puttgtport: | |
431 | nvmet_fc_tgtport_put(tgtport); | |
432 | ||
433 | return ret; | |
434 | } | |
435 | ||
436 | static int | |
437 | nvmet_fc_send_ls_req_async(struct nvmet_fc_tgtport *tgtport, | |
438 | struct nvmet_fc_ls_req_op *lsop, | |
439 | void (*done)(struct nvmefc_ls_req *req, int status)) | |
440 | { | |
441 | /* don't wait for completion */ | |
442 | ||
443 | return __nvmet_fc_send_ls_req(tgtport, lsop, done); | |
444 | } | |
445 | ||
446 | static void | |
447 | nvmet_fc_disconnect_assoc_done(struct nvmefc_ls_req *lsreq, int status) | |
448 | { | |
449 | struct nvmet_fc_ls_req_op *lsop = | |
450 | container_of(lsreq, struct nvmet_fc_ls_req_op, ls_req); | |
451 | ||
452 | __nvmet_fc_finish_ls_req(lsop); | |
453 | ||
454 | /* fc-nvme target doesn't care about success or failure of cmd */ | |
455 | ||
456 | kfree(lsop); | |
457 | } | |
458 | ||
459 | /* | |
460 | * This routine sends a FC-NVME LS to disconnect (aka terminate) | |
461 | * the FC-NVME Association. Terminating the association also | |
462 | * terminates the FC-NVME connections (per queue, both admin and io | |
463 | * queues) that are part of the association. E.g. things are torn | |
464 | * down, and the related FC-NVME Association ID and Connection IDs | |
465 | * become invalid. | |
466 | * | |
467 | * The behavior of the fc-nvme target is such that it's | |
468 | * understanding of the association and connections will implicitly | |
469 | * be torn down. The action is implicit as it may be due to a loss of | |
470 | * connectivity with the fc-nvme host, so the target may never get a | |
471 | * response even if it tried. As such, the action of this routine | |
472 | * is to asynchronously send the LS, ignore any results of the LS, and | |
473 | * continue on with terminating the association. If the fc-nvme host | |
474 | * is present and receives the LS, it too can tear down. | |
475 | */ | |
476 | static void | |
477 | nvmet_fc_xmt_disconnect_assoc(struct nvmet_fc_tgt_assoc *assoc) | |
478 | { | |
479 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
480 | struct fcnvme_ls_disconnect_assoc_rqst *discon_rqst; | |
481 | struct fcnvme_ls_disconnect_assoc_acc *discon_acc; | |
482 | struct nvmet_fc_ls_req_op *lsop; | |
483 | struct nvmefc_ls_req *lsreq; | |
484 | int ret; | |
485 | ||
486 | /* | |
487 | * If ls_req is NULL or no hosthandle, it's an older lldd and no | |
488 | * message is normal. Otherwise, send unless the hostport has | |
489 | * already been invalidated by the lldd. | |
490 | */ | |
491 | if (!tgtport->ops->ls_req || !assoc->hostport || | |
492 | assoc->hostport->invalid) | |
493 | return; | |
494 | ||
495 | lsop = kzalloc((sizeof(*lsop) + | |
496 | sizeof(*discon_rqst) + sizeof(*discon_acc) + | |
497 | tgtport->ops->lsrqst_priv_sz), GFP_KERNEL); | |
498 | if (!lsop) { | |
499 | dev_info(tgtport->dev, | |
500 | "{%d:%d} send Disconnect Association failed: ENOMEM\n", | |
501 | tgtport->fc_target_port.port_num, assoc->a_id); | |
502 | return; | |
503 | } | |
504 | ||
505 | discon_rqst = (struct fcnvme_ls_disconnect_assoc_rqst *)&lsop[1]; | |
506 | discon_acc = (struct fcnvme_ls_disconnect_assoc_acc *)&discon_rqst[1]; | |
507 | lsreq = &lsop->ls_req; | |
508 | if (tgtport->ops->lsrqst_priv_sz) | |
509 | lsreq->private = (void *)&discon_acc[1]; | |
510 | else | |
511 | lsreq->private = NULL; | |
512 | ||
513 | lsop->tgtport = tgtport; | |
514 | lsop->hosthandle = assoc->hostport->hosthandle; | |
515 | ||
516 | nvmefc_fmt_lsreq_discon_assoc(lsreq, discon_rqst, discon_acc, | |
517 | assoc->association_id); | |
518 | ||
519 | ret = nvmet_fc_send_ls_req_async(tgtport, lsop, | |
520 | nvmet_fc_disconnect_assoc_done); | |
521 | if (ret) { | |
522 | dev_info(tgtport->dev, | |
523 | "{%d:%d} XMT Disconnect Association failed: %d\n", | |
524 | tgtport->fc_target_port.port_num, assoc->a_id, ret); | |
525 | kfree(lsop); | |
526 | } | |
527 | } | |
528 | ||
529 | ||
c5343203 JS |
530 | /* *********************** FC-NVME Port Management ************************ */ |
531 | ||
532 | ||
533 | static int | |
534 | nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport) | |
535 | { | |
536 | struct nvmet_fc_ls_iod *iod; | |
537 | int i; | |
538 | ||
539 | iod = kcalloc(NVMET_LS_CTX_COUNT, sizeof(struct nvmet_fc_ls_iod), | |
540 | GFP_KERNEL); | |
541 | if (!iod) | |
542 | return -ENOMEM; | |
543 | ||
544 | tgtport->iod = iod; | |
545 | ||
546 | for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { | |
547 | INIT_WORK(&iod->work, nvmet_fc_handle_ls_rqst_work); | |
548 | iod->tgtport = tgtport; | |
349c694e | 549 | list_add_tail(&iod->ls_rcv_list, &tgtport->ls_rcv_list); |
c5343203 | 550 | |
3b8281b0 JS |
551 | iod->rqstbuf = kzalloc(sizeof(union nvmefc_ls_requests) + |
552 | sizeof(union nvmefc_ls_responses), | |
553 | GFP_KERNEL); | |
c5343203 JS |
554 | if (!iod->rqstbuf) |
555 | goto out_fail; | |
556 | ||
3b8281b0 | 557 | iod->rspbuf = (union nvmefc_ls_responses *)&iod->rqstbuf[1]; |
c5343203 JS |
558 | |
559 | iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf, | |
3b8281b0 | 560 | sizeof(*iod->rspbuf), |
c5343203 JS |
561 | DMA_TO_DEVICE); |
562 | if (fc_dma_mapping_error(tgtport->dev, iod->rspdma)) | |
563 | goto out_fail; | |
564 | } | |
565 | ||
566 | return 0; | |
567 | ||
568 | out_fail: | |
569 | kfree(iod->rqstbuf); | |
349c694e | 570 | list_del(&iod->ls_rcv_list); |
c5343203 JS |
571 | for (iod--, i--; i >= 0; iod--, i--) { |
572 | fc_dma_unmap_single(tgtport->dev, iod->rspdma, | |
3b8281b0 | 573 | sizeof(*iod->rspbuf), DMA_TO_DEVICE); |
c5343203 | 574 | kfree(iod->rqstbuf); |
349c694e | 575 | list_del(&iod->ls_rcv_list); |
c5343203 JS |
576 | } |
577 | ||
578 | kfree(iod); | |
579 | ||
580 | return -EFAULT; | |
581 | } | |
582 | ||
583 | static void | |
584 | nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport) | |
585 | { | |
586 | struct nvmet_fc_ls_iod *iod = tgtport->iod; | |
587 | int i; | |
588 | ||
589 | for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { | |
590 | fc_dma_unmap_single(tgtport->dev, | |
3b8281b0 | 591 | iod->rspdma, sizeof(*iod->rspbuf), |
c5343203 JS |
592 | DMA_TO_DEVICE); |
593 | kfree(iod->rqstbuf); | |
349c694e | 594 | list_del(&iod->ls_rcv_list); |
c5343203 JS |
595 | } |
596 | kfree(tgtport->iod); | |
597 | } | |
598 | ||
599 | static struct nvmet_fc_ls_iod * | |
600 | nvmet_fc_alloc_ls_iod(struct nvmet_fc_tgtport *tgtport) | |
601 | { | |
369157b4 | 602 | struct nvmet_fc_ls_iod *iod; |
c5343203 JS |
603 | unsigned long flags; |
604 | ||
605 | spin_lock_irqsave(&tgtport->lock, flags); | |
349c694e JS |
606 | iod = list_first_entry_or_null(&tgtport->ls_rcv_list, |
607 | struct nvmet_fc_ls_iod, ls_rcv_list); | |
c5343203 | 608 | if (iod) |
349c694e | 609 | list_move_tail(&iod->ls_rcv_list, &tgtport->ls_busylist); |
c5343203 JS |
610 | spin_unlock_irqrestore(&tgtport->lock, flags); |
611 | return iod; | |
612 | } | |
613 | ||
614 | ||
615 | static void | |
616 | nvmet_fc_free_ls_iod(struct nvmet_fc_tgtport *tgtport, | |
617 | struct nvmet_fc_ls_iod *iod) | |
618 | { | |
619 | unsigned long flags; | |
620 | ||
621 | spin_lock_irqsave(&tgtport->lock, flags); | |
349c694e | 622 | list_move(&iod->ls_rcv_list, &tgtport->ls_rcv_list); |
c5343203 JS |
623 | spin_unlock_irqrestore(&tgtport->lock, flags); |
624 | } | |
625 | ||
626 | static void | |
627 | nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, | |
628 | struct nvmet_fc_tgt_queue *queue) | |
629 | { | |
630 | struct nvmet_fc_fcp_iod *fod = queue->fod; | |
631 | int i; | |
632 | ||
633 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
9d625f77 | 634 | INIT_WORK(&fod->defer_work, nvmet_fc_fcp_rqst_op_defer_work); |
c5343203 JS |
635 | fod->tgtport = tgtport; |
636 | fod->queue = queue; | |
637 | fod->active = false; | |
a97ec51b JS |
638 | fod->abort = false; |
639 | fod->aborted = false; | |
640 | fod->fcpreq = NULL; | |
c5343203 JS |
641 | list_add_tail(&fod->fcp_list, &queue->fod_list); |
642 | spin_lock_init(&fod->flock); | |
643 | ||
644 | fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf, | |
645 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
646 | if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) { | |
647 | list_del(&fod->fcp_list); | |
648 | for (fod--, i--; i >= 0; fod--, i--) { | |
649 | fc_dma_unmap_single(tgtport->dev, fod->rspdma, | |
650 | sizeof(fod->rspiubuf), | |
651 | DMA_TO_DEVICE); | |
652 | fod->rspdma = 0L; | |
653 | list_del(&fod->fcp_list); | |
654 | } | |
655 | ||
656 | return; | |
657 | } | |
658 | } | |
659 | } | |
660 | ||
661 | static void | |
662 | nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, | |
663 | struct nvmet_fc_tgt_queue *queue) | |
664 | { | |
665 | struct nvmet_fc_fcp_iod *fod = queue->fod; | |
666 | int i; | |
667 | ||
668 | for (i = 0; i < queue->sqsize; fod++, i++) { | |
669 | if (fod->rspdma) | |
670 | fc_dma_unmap_single(tgtport->dev, fod->rspdma, | |
671 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
672 | } | |
673 | } | |
674 | ||
675 | static struct nvmet_fc_fcp_iod * | |
676 | nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue) | |
677 | { | |
369157b4 | 678 | struct nvmet_fc_fcp_iod *fod; |
c5343203 | 679 | |
0fb228d3 JS |
680 | lockdep_assert_held(&queue->qlock); |
681 | ||
c5343203 JS |
682 | fod = list_first_entry_or_null(&queue->fod_list, |
683 | struct nvmet_fc_fcp_iod, fcp_list); | |
684 | if (fod) { | |
685 | list_del(&fod->fcp_list); | |
686 | fod->active = true; | |
c5343203 JS |
687 | /* |
688 | * no queue reference is taken, as it was taken by the | |
689 | * queue lookup just prior to the allocation. The iod | |
690 | * will "inherit" that reference. | |
691 | */ | |
692 | } | |
c5343203 JS |
693 | return fod; |
694 | } | |
695 | ||
696 | ||
0fb228d3 JS |
697 | static void |
698 | nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport, | |
699 | struct nvmet_fc_tgt_queue *queue, | |
700 | struct nvmefc_tgt_fcp_req *fcpreq) | |
701 | { | |
702 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
703 | ||
704 | /* | |
705 | * put all admin cmds on hw queue id 0. All io commands go to | |
706 | * the respective hw queue based on a modulo basis | |
707 | */ | |
708 | fcpreq->hwqid = queue->qid ? | |
709 | ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0; | |
710 | ||
6e2e312e | 711 | nvmet_fc_handle_fcp_rqst(tgtport, fod); |
0fb228d3 JS |
712 | } |
713 | ||
9d625f77 JS |
714 | static void |
715 | nvmet_fc_fcp_rqst_op_defer_work(struct work_struct *work) | |
716 | { | |
717 | struct nvmet_fc_fcp_iod *fod = | |
718 | container_of(work, struct nvmet_fc_fcp_iod, defer_work); | |
719 | ||
720 | /* Submit deferred IO for processing */ | |
721 | nvmet_fc_queue_fcp_req(fod->tgtport, fod->queue, fod->fcpreq); | |
722 | ||
723 | } | |
724 | ||
c5343203 JS |
725 | static void |
726 | nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue, | |
727 | struct nvmet_fc_fcp_iod *fod) | |
728 | { | |
19b58d94 JS |
729 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; |
730 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
0fb228d3 | 731 | struct nvmet_fc_defer_fcp_req *deferfcp; |
c5343203 JS |
732 | unsigned long flags; |
733 | ||
a97ec51b JS |
734 | fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma, |
735 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
736 | ||
737 | fcpreq->nvmet_fc_private = NULL; | |
738 | ||
c5343203 | 739 | fod->active = false; |
a97ec51b JS |
740 | fod->abort = false; |
741 | fod->aborted = false; | |
742 | fod->writedataactive = false; | |
743 | fod->fcpreq = NULL; | |
0fb228d3 JS |
744 | |
745 | tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq); | |
746 | ||
619c62dc JS |
747 | /* release the queue lookup reference on the completed IO */ |
748 | nvmet_fc_tgt_q_put(queue); | |
749 | ||
0fb228d3 JS |
750 | spin_lock_irqsave(&queue->qlock, flags); |
751 | deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, | |
752 | struct nvmet_fc_defer_fcp_req, req_list); | |
753 | if (!deferfcp) { | |
754 | list_add_tail(&fod->fcp_list, &fod->queue->fod_list); | |
755 | spin_unlock_irqrestore(&queue->qlock, flags); | |
0fb228d3 JS |
756 | return; |
757 | } | |
758 | ||
759 | /* Re-use the fod for the next pending cmd that was deferred */ | |
760 | list_del(&deferfcp->req_list); | |
761 | ||
762 | fcpreq = deferfcp->fcp_req; | |
763 | ||
764 | /* deferfcp can be reused for another IO at a later date */ | |
765 | list_add_tail(&deferfcp->req_list, &queue->avail_defer_list); | |
766 | ||
c5343203 JS |
767 | spin_unlock_irqrestore(&queue->qlock, flags); |
768 | ||
0fb228d3 JS |
769 | /* Save NVME CMD IO in fod */ |
770 | memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen); | |
771 | ||
772 | /* Setup new fcpreq to be processed */ | |
773 | fcpreq->rspaddr = NULL; | |
774 | fcpreq->rsplen = 0; | |
775 | fcpreq->nvmet_fc_private = fod; | |
776 | fod->fcpreq = fcpreq; | |
777 | fod->active = true; | |
778 | ||
779 | /* inform LLDD IO is now being processed */ | |
780 | tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq); | |
781 | ||
c5343203 | 782 | /* |
0fb228d3 JS |
783 | * Leave the queue lookup get reference taken when |
784 | * fod was originally allocated. | |
c5343203 | 785 | */ |
9d625f77 JS |
786 | |
787 | queue_work(queue->work_q, &fod->defer_work); | |
c5343203 JS |
788 | } |
789 | ||
c5343203 JS |
790 | static struct nvmet_fc_tgt_queue * |
791 | nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc, | |
792 | u16 qid, u16 sqsize) | |
793 | { | |
794 | struct nvmet_fc_tgt_queue *queue; | |
c5343203 JS |
795 | int ret; |
796 | ||
deb61742 | 797 | if (qid > NVMET_NR_QUEUES) |
c5343203 JS |
798 | return NULL; |
799 | ||
6b80f1d2 | 800 | queue = kzalloc(struct_size(queue, fod, sqsize), GFP_KERNEL); |
c5343203 JS |
801 | if (!queue) |
802 | return NULL; | |
803 | ||
804 | if (!nvmet_fc_tgt_a_get(assoc)) | |
805 | goto out_free_queue; | |
806 | ||
807 | queue->work_q = alloc_workqueue("ntfc%d.%d.%d", 0, 0, | |
808 | assoc->tgtport->fc_target_port.port_num, | |
809 | assoc->a_id, qid); | |
810 | if (!queue->work_q) | |
811 | goto out_a_put; | |
812 | ||
c5343203 JS |
813 | queue->qid = qid; |
814 | queue->sqsize = sqsize; | |
815 | queue->assoc = assoc; | |
c5343203 | 816 | INIT_LIST_HEAD(&queue->fod_list); |
0fb228d3 JS |
817 | INIT_LIST_HEAD(&queue->avail_defer_list); |
818 | INIT_LIST_HEAD(&queue->pending_cmd_list); | |
c5343203 JS |
819 | atomic_set(&queue->connected, 0); |
820 | atomic_set(&queue->sqtail, 0); | |
821 | atomic_set(&queue->rsn, 1); | |
822 | atomic_set(&queue->zrspcnt, 0); | |
823 | spin_lock_init(&queue->qlock); | |
824 | kref_init(&queue->ref); | |
825 | ||
826 | nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue); | |
827 | ||
828 | ret = nvmet_sq_init(&queue->nvme_sq); | |
829 | if (ret) | |
830 | goto out_fail_iodlist; | |
831 | ||
832 | WARN_ON(assoc->queues[qid]); | |
4e2f02bf | 833 | rcu_assign_pointer(assoc->queues[qid], queue); |
c5343203 JS |
834 | |
835 | return queue; | |
836 | ||
837 | out_fail_iodlist: | |
838 | nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue); | |
839 | destroy_workqueue(queue->work_q); | |
840 | out_a_put: | |
841 | nvmet_fc_tgt_a_put(assoc); | |
842 | out_free_queue: | |
843 | kfree(queue); | |
844 | return NULL; | |
845 | } | |
846 | ||
847 | ||
848 | static void | |
849 | nvmet_fc_tgt_queue_free(struct kref *ref) | |
850 | { | |
851 | struct nvmet_fc_tgt_queue *queue = | |
852 | container_of(ref, struct nvmet_fc_tgt_queue, ref); | |
c5343203 | 853 | |
4e2f02bf | 854 | rcu_assign_pointer(queue->assoc->queues[queue->qid], NULL); |
c5343203 JS |
855 | |
856 | nvmet_fc_destroy_fcp_iodlist(queue->assoc->tgtport, queue); | |
857 | ||
858 | nvmet_fc_tgt_a_put(queue->assoc); | |
859 | ||
860 | destroy_workqueue(queue->work_q); | |
861 | ||
4e2f02bf | 862 | kfree_rcu(queue, rcu); |
c5343203 JS |
863 | } |
864 | ||
865 | static void | |
866 | nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue) | |
867 | { | |
868 | kref_put(&queue->ref, nvmet_fc_tgt_queue_free); | |
869 | } | |
870 | ||
871 | static int | |
872 | nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue) | |
873 | { | |
874 | return kref_get_unless_zero(&queue->ref); | |
875 | } | |
876 | ||
877 | ||
c5343203 JS |
878 | static void |
879 | nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue) | |
880 | { | |
a97ec51b | 881 | struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport; |
c5343203 | 882 | struct nvmet_fc_fcp_iod *fod = queue->fod; |
16a5a480 | 883 | struct nvmet_fc_defer_fcp_req *deferfcp, *tempptr; |
c5343203 | 884 | unsigned long flags; |
0dfb992e | 885 | int i; |
c5343203 JS |
886 | bool disconnect; |
887 | ||
888 | disconnect = atomic_xchg(&queue->connected, 0); | |
889 | ||
47bf3241 JS |
890 | /* if not connected, nothing to do */ |
891 | if (!disconnect) | |
892 | return; | |
893 | ||
c5343203 | 894 | spin_lock_irqsave(&queue->qlock, flags); |
d038dd81 | 895 | /* abort outstanding io's */ |
c5343203 JS |
896 | for (i = 0; i < queue->sqsize; fod++, i++) { |
897 | if (fod->active) { | |
898 | spin_lock(&fod->flock); | |
899 | fod->abort = true; | |
a97ec51b JS |
900 | /* |
901 | * only call lldd abort routine if waiting for | |
902 | * writedata. other outstanding ops should finish | |
903 | * on their own. | |
904 | */ | |
0dfb992e | 905 | if (fod->writedataactive) { |
a97ec51b JS |
906 | fod->aborted = true; |
907 | spin_unlock(&fod->flock); | |
908 | tgtport->ops->fcp_abort( | |
909 | &tgtport->fc_target_port, fod->fcpreq); | |
0dfb992e JS |
910 | } else |
911 | spin_unlock(&fod->flock); | |
c5343203 JS |
912 | } |
913 | } | |
0fb228d3 JS |
914 | |
915 | /* Cleanup defer'ed IOs in queue */ | |
16a5a480 JS |
916 | list_for_each_entry_safe(deferfcp, tempptr, &queue->avail_defer_list, |
917 | req_list) { | |
0fb228d3 JS |
918 | list_del(&deferfcp->req_list); |
919 | kfree(deferfcp); | |
920 | } | |
921 | ||
922 | for (;;) { | |
923 | deferfcp = list_first_entry_or_null(&queue->pending_cmd_list, | |
924 | struct nvmet_fc_defer_fcp_req, req_list); | |
925 | if (!deferfcp) | |
926 | break; | |
927 | ||
928 | list_del(&deferfcp->req_list); | |
929 | spin_unlock_irqrestore(&queue->qlock, flags); | |
930 | ||
931 | tgtport->ops->defer_rcv(&tgtport->fc_target_port, | |
932 | deferfcp->fcp_req); | |
933 | ||
934 | tgtport->ops->fcp_abort(&tgtport->fc_target_port, | |
935 | deferfcp->fcp_req); | |
936 | ||
937 | tgtport->ops->fcp_req_release(&tgtport->fc_target_port, | |
938 | deferfcp->fcp_req); | |
939 | ||
619c62dc JS |
940 | /* release the queue lookup reference */ |
941 | nvmet_fc_tgt_q_put(queue); | |
942 | ||
0fb228d3 JS |
943 | kfree(deferfcp); |
944 | ||
945 | spin_lock_irqsave(&queue->qlock, flags); | |
946 | } | |
c5343203 JS |
947 | spin_unlock_irqrestore(&queue->qlock, flags); |
948 | ||
949 | flush_workqueue(queue->work_q); | |
950 | ||
0dfb992e | 951 | nvmet_sq_destroy(&queue->nvme_sq); |
c5343203 JS |
952 | |
953 | nvmet_fc_tgt_q_put(queue); | |
954 | } | |
955 | ||
956 | static struct nvmet_fc_tgt_queue * | |
957 | nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport, | |
958 | u64 connection_id) | |
959 | { | |
960 | struct nvmet_fc_tgt_assoc *assoc; | |
961 | struct nvmet_fc_tgt_queue *queue; | |
962 | u64 association_id = nvmet_fc_getassociationid(connection_id); | |
963 | u16 qid = nvmet_fc_getqueueid(connection_id); | |
c5343203 | 964 | |
0c319d3a JS |
965 | if (qid > NVMET_NR_QUEUES) |
966 | return NULL; | |
967 | ||
4e2f02bf LR |
968 | rcu_read_lock(); |
969 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
c5343203 | 970 | if (association_id == assoc->association_id) { |
4e2f02bf | 971 | queue = rcu_dereference(assoc->queues[qid]); |
c5343203 JS |
972 | if (queue && |
973 | (!atomic_read(&queue->connected) || | |
974 | !nvmet_fc_tgt_q_get(queue))) | |
975 | queue = NULL; | |
4e2f02bf | 976 | rcu_read_unlock(); |
c5343203 JS |
977 | return queue; |
978 | } | |
979 | } | |
4e2f02bf | 980 | rcu_read_unlock(); |
c5343203 JS |
981 | return NULL; |
982 | } | |
983 | ||
58ab8ff9 JS |
984 | static void |
985 | nvmet_fc_hostport_free(struct kref *ref) | |
986 | { | |
987 | struct nvmet_fc_hostport *hostport = | |
988 | container_of(ref, struct nvmet_fc_hostport, ref); | |
989 | struct nvmet_fc_tgtport *tgtport = hostport->tgtport; | |
990 | unsigned long flags; | |
991 | ||
992 | spin_lock_irqsave(&tgtport->lock, flags); | |
993 | list_del(&hostport->host_list); | |
994 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
995 | if (tgtport->ops->host_release && hostport->invalid) | |
996 | tgtport->ops->host_release(hostport->hosthandle); | |
997 | kfree(hostport); | |
998 | nvmet_fc_tgtport_put(tgtport); | |
999 | } | |
1000 | ||
1001 | static void | |
1002 | nvmet_fc_hostport_put(struct nvmet_fc_hostport *hostport) | |
1003 | { | |
1004 | kref_put(&hostport->ref, nvmet_fc_hostport_free); | |
1005 | } | |
1006 | ||
1007 | static int | |
1008 | nvmet_fc_hostport_get(struct nvmet_fc_hostport *hostport) | |
1009 | { | |
1010 | return kref_get_unless_zero(&hostport->ref); | |
1011 | } | |
1012 | ||
1013 | static void | |
1014 | nvmet_fc_free_hostport(struct nvmet_fc_hostport *hostport) | |
1015 | { | |
1016 | /* if LLDD not implemented, leave as NULL */ | |
ddd3d105 | 1017 | if (!hostport || !hostport->hosthandle) |
58ab8ff9 JS |
1018 | return; |
1019 | ||
1020 | nvmet_fc_hostport_put(hostport); | |
1021 | } | |
1022 | ||
0d8ddeea AE |
1023 | static struct nvmet_fc_hostport * |
1024 | nvmet_fc_match_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle) | |
1025 | { | |
1026 | struct nvmet_fc_hostport *host; | |
1027 | ||
1028 | lockdep_assert_held(&tgtport->lock); | |
1029 | ||
1030 | list_for_each_entry(host, &tgtport->host_list, host_list) { | |
1031 | if (host->hosthandle == hosthandle && !host->invalid) { | |
1032 | if (nvmet_fc_hostport_get(host)) | |
1033 | return (host); | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | return NULL; | |
1038 | } | |
1039 | ||
58ab8ff9 JS |
1040 | static struct nvmet_fc_hostport * |
1041 | nvmet_fc_alloc_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle) | |
1042 | { | |
0d8ddeea | 1043 | struct nvmet_fc_hostport *newhost, *match = NULL; |
58ab8ff9 JS |
1044 | unsigned long flags; |
1045 | ||
1046 | /* if LLDD not implemented, leave as NULL */ | |
1047 | if (!hosthandle) | |
1048 | return NULL; | |
1049 | ||
0d8ddeea AE |
1050 | /* |
1051 | * take reference for what will be the newly allocated hostport if | |
1052 | * we end up using a new allocation | |
1053 | */ | |
58ab8ff9 JS |
1054 | if (!nvmet_fc_tgtport_get(tgtport)) |
1055 | return ERR_PTR(-EINVAL); | |
1056 | ||
0d8ddeea AE |
1057 | spin_lock_irqsave(&tgtport->lock, flags); |
1058 | match = nvmet_fc_match_hostport(tgtport, hosthandle); | |
1059 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1060 | ||
1061 | if (match) { | |
1062 | /* no new allocation - release reference */ | |
1063 | nvmet_fc_tgtport_put(tgtport); | |
1064 | return match; | |
1065 | } | |
1066 | ||
58ab8ff9 JS |
1067 | newhost = kzalloc(sizeof(*newhost), GFP_KERNEL); |
1068 | if (!newhost) { | |
0d8ddeea | 1069 | /* no new allocation - release reference */ |
58ab8ff9 | 1070 | nvmet_fc_tgtport_put(tgtport); |
0d8ddeea | 1071 | return ERR_PTR(-ENOMEM); |
58ab8ff9 JS |
1072 | } |
1073 | ||
58ab8ff9 | 1074 | spin_lock_irqsave(&tgtport->lock, flags); |
0d8ddeea | 1075 | match = nvmet_fc_match_hostport(tgtport, hosthandle); |
58ab8ff9 | 1076 | if (match) { |
0d8ddeea | 1077 | /* new allocation not needed */ |
58ab8ff9 | 1078 | kfree(newhost); |
0d8ddeea AE |
1079 | newhost = match; |
1080 | /* no new allocation - release reference */ | |
58ab8ff9 | 1081 | nvmet_fc_tgtport_put(tgtport); |
0d8ddeea AE |
1082 | } else { |
1083 | newhost->tgtport = tgtport; | |
1084 | newhost->hosthandle = hosthandle; | |
1085 | INIT_LIST_HEAD(&newhost->host_list); | |
1086 | kref_init(&newhost->ref); | |
1087 | ||
58ab8ff9 | 1088 | list_add_tail(&newhost->host_list, &tgtport->host_list); |
0d8ddeea | 1089 | } |
58ab8ff9 JS |
1090 | spin_unlock_irqrestore(&tgtport->lock, flags); |
1091 | ||
0d8ddeea | 1092 | return newhost; |
58ab8ff9 JS |
1093 | } |
1094 | ||
a96d4bd8 JS |
1095 | static void |
1096 | nvmet_fc_delete_assoc(struct work_struct *work) | |
1097 | { | |
1098 | struct nvmet_fc_tgt_assoc *assoc = | |
1099 | container_of(work, struct nvmet_fc_tgt_assoc, del_work); | |
1100 | ||
1101 | nvmet_fc_delete_target_assoc(assoc); | |
1102 | nvmet_fc_tgt_a_put(assoc); | |
1103 | } | |
1104 | ||
c5343203 | 1105 | static struct nvmet_fc_tgt_assoc * |
58ab8ff9 | 1106 | nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport, void *hosthandle) |
c5343203 JS |
1107 | { |
1108 | struct nvmet_fc_tgt_assoc *assoc, *tmpassoc; | |
1109 | unsigned long flags; | |
1110 | u64 ran; | |
1111 | int idx; | |
1112 | bool needrandom = true; | |
1113 | ||
1114 | assoc = kzalloc(sizeof(*assoc), GFP_KERNEL); | |
1115 | if (!assoc) | |
1116 | return NULL; | |
1117 | ||
1118 | idx = ida_simple_get(&tgtport->assoc_cnt, 0, 0, GFP_KERNEL); | |
1119 | if (idx < 0) | |
1120 | goto out_free_assoc; | |
1121 | ||
1122 | if (!nvmet_fc_tgtport_get(tgtport)) | |
58ab8ff9 JS |
1123 | goto out_ida; |
1124 | ||
1125 | assoc->hostport = nvmet_fc_alloc_hostport(tgtport, hosthandle); | |
1126 | if (IS_ERR(assoc->hostport)) | |
1127 | goto out_put; | |
c5343203 JS |
1128 | |
1129 | assoc->tgtport = tgtport; | |
1130 | assoc->a_id = idx; | |
1131 | INIT_LIST_HEAD(&assoc->a_list); | |
1132 | kref_init(&assoc->ref); | |
a96d4bd8 | 1133 | INIT_WORK(&assoc->del_work, nvmet_fc_delete_assoc); |
47bf3241 | 1134 | atomic_set(&assoc->terminating, 0); |
c5343203 JS |
1135 | |
1136 | while (needrandom) { | |
1137 | get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID); | |
1138 | ran = ran << BYTES_FOR_QID_SHIFT; | |
1139 | ||
1140 | spin_lock_irqsave(&tgtport->lock, flags); | |
1141 | needrandom = false; | |
e4fcc72c | 1142 | list_for_each_entry(tmpassoc, &tgtport->assoc_list, a_list) { |
c5343203 JS |
1143 | if (ran == tmpassoc->association_id) { |
1144 | needrandom = true; | |
1145 | break; | |
1146 | } | |
e4fcc72c | 1147 | } |
c5343203 JS |
1148 | if (!needrandom) { |
1149 | assoc->association_id = ran; | |
4e2f02bf | 1150 | list_add_tail_rcu(&assoc->a_list, &tgtport->assoc_list); |
c5343203 JS |
1151 | } |
1152 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1153 | } | |
1154 | ||
1155 | return assoc; | |
1156 | ||
58ab8ff9 JS |
1157 | out_put: |
1158 | nvmet_fc_tgtport_put(tgtport); | |
1159 | out_ida: | |
c5343203 JS |
1160 | ida_simple_remove(&tgtport->assoc_cnt, idx); |
1161 | out_free_assoc: | |
1162 | kfree(assoc); | |
1163 | return NULL; | |
1164 | } | |
1165 | ||
1166 | static void | |
1167 | nvmet_fc_target_assoc_free(struct kref *ref) | |
1168 | { | |
1169 | struct nvmet_fc_tgt_assoc *assoc = | |
1170 | container_of(ref, struct nvmet_fc_tgt_assoc, ref); | |
1171 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
47bf3241 | 1172 | struct nvmet_fc_ls_iod *oldls; |
c5343203 JS |
1173 | unsigned long flags; |
1174 | ||
47bf3241 JS |
1175 | /* Send Disconnect now that all i/o has completed */ |
1176 | nvmet_fc_xmt_disconnect_assoc(assoc); | |
1177 | ||
58ab8ff9 | 1178 | nvmet_fc_free_hostport(assoc->hostport); |
c5343203 | 1179 | spin_lock_irqsave(&tgtport->lock, flags); |
4e2f02bf | 1180 | list_del_rcu(&assoc->a_list); |
47bf3241 | 1181 | oldls = assoc->rcv_disconn; |
c5343203 | 1182 | spin_unlock_irqrestore(&tgtport->lock, flags); |
47bf3241 JS |
1183 | /* if pending Rcv Disconnect Association LS, send rsp now */ |
1184 | if (oldls) | |
1185 | nvmet_fc_xmt_ls_rsp(tgtport, oldls); | |
c5343203 | 1186 | ida_simple_remove(&tgtport->assoc_cnt, assoc->a_id); |
47bf3241 JS |
1187 | dev_info(tgtport->dev, |
1188 | "{%d:%d} Association freed\n", | |
1189 | tgtport->fc_target_port.port_num, assoc->a_id); | |
4e2f02bf | 1190 | kfree_rcu(assoc, rcu); |
c5343203 JS |
1191 | nvmet_fc_tgtport_put(tgtport); |
1192 | } | |
1193 | ||
1194 | static void | |
1195 | nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc) | |
1196 | { | |
1197 | kref_put(&assoc->ref, nvmet_fc_target_assoc_free); | |
1198 | } | |
1199 | ||
1200 | static int | |
1201 | nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc) | |
1202 | { | |
1203 | return kref_get_unless_zero(&assoc->ref); | |
1204 | } | |
1205 | ||
1206 | static void | |
1207 | nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc) | |
1208 | { | |
1209 | struct nvmet_fc_tgtport *tgtport = assoc->tgtport; | |
1210 | struct nvmet_fc_tgt_queue *queue; | |
47bf3241 JS |
1211 | int i, terminating; |
1212 | ||
1213 | terminating = atomic_xchg(&assoc->terminating, 1); | |
1214 | ||
1215 | /* if already terminating, do nothing */ | |
1216 | if (terminating) | |
1217 | return; | |
c5343203 | 1218 | |
4e2f02bf | 1219 | |
deb61742 | 1220 | for (i = NVMET_NR_QUEUES; i >= 0; i--) { |
4e2f02bf LR |
1221 | rcu_read_lock(); |
1222 | queue = rcu_dereference(assoc->queues[i]); | |
1223 | if (!queue) { | |
1224 | rcu_read_unlock(); | |
1225 | continue; | |
1226 | } | |
1227 | ||
1228 | if (!nvmet_fc_tgt_q_get(queue)) { | |
1229 | rcu_read_unlock(); | |
1230 | continue; | |
c5343203 | 1231 | } |
4e2f02bf LR |
1232 | rcu_read_unlock(); |
1233 | nvmet_fc_delete_target_queue(queue); | |
1234 | nvmet_fc_tgt_q_put(queue); | |
c5343203 | 1235 | } |
c5343203 | 1236 | |
47bf3241 JS |
1237 | dev_info(tgtport->dev, |
1238 | "{%d:%d} Association deleted\n", | |
1239 | tgtport->fc_target_port.port_num, assoc->a_id); | |
1240 | ||
c5343203 JS |
1241 | nvmet_fc_tgt_a_put(assoc); |
1242 | } | |
1243 | ||
1244 | static struct nvmet_fc_tgt_assoc * | |
1245 | nvmet_fc_find_target_assoc(struct nvmet_fc_tgtport *tgtport, | |
1246 | u64 association_id) | |
1247 | { | |
1248 | struct nvmet_fc_tgt_assoc *assoc; | |
1249 | struct nvmet_fc_tgt_assoc *ret = NULL; | |
c5343203 | 1250 | |
4e2f02bf LR |
1251 | rcu_read_lock(); |
1252 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
c5343203 JS |
1253 | if (association_id == assoc->association_id) { |
1254 | ret = assoc; | |
34efa232 JS |
1255 | if (!nvmet_fc_tgt_a_get(assoc)) |
1256 | ret = NULL; | |
c5343203 JS |
1257 | break; |
1258 | } | |
1259 | } | |
4e2f02bf | 1260 | rcu_read_unlock(); |
c5343203 JS |
1261 | |
1262 | return ret; | |
1263 | } | |
1264 | ||
ea96d649 JS |
1265 | static void |
1266 | nvmet_fc_portentry_bind(struct nvmet_fc_tgtport *tgtport, | |
1267 | struct nvmet_fc_port_entry *pe, | |
1268 | struct nvmet_port *port) | |
1269 | { | |
1270 | lockdep_assert_held(&nvmet_fc_tgtlock); | |
1271 | ||
1272 | pe->tgtport = tgtport; | |
1273 | tgtport->pe = pe; | |
1274 | ||
1275 | pe->port = port; | |
1276 | port->priv = pe; | |
1277 | ||
1278 | pe->node_name = tgtport->fc_target_port.node_name; | |
1279 | pe->port_name = tgtport->fc_target_port.port_name; | |
1280 | INIT_LIST_HEAD(&pe->pe_list); | |
1281 | ||
1282 | list_add_tail(&pe->pe_list, &nvmet_fc_portentry_list); | |
1283 | } | |
1284 | ||
1285 | static void | |
1286 | nvmet_fc_portentry_unbind(struct nvmet_fc_port_entry *pe) | |
1287 | { | |
1288 | unsigned long flags; | |
1289 | ||
1290 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1291 | if (pe->tgtport) | |
1292 | pe->tgtport->pe = NULL; | |
1293 | list_del(&pe->pe_list); | |
1294 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * called when a targetport deregisters. Breaks the relationship | |
1299 | * with the nvmet port, but leaves the port_entry in place so that | |
1300 | * re-registration can resume operation. | |
1301 | */ | |
1302 | static void | |
1303 | nvmet_fc_portentry_unbind_tgt(struct nvmet_fc_tgtport *tgtport) | |
1304 | { | |
1305 | struct nvmet_fc_port_entry *pe; | |
1306 | unsigned long flags; | |
1307 | ||
1308 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1309 | pe = tgtport->pe; | |
1310 | if (pe) | |
1311 | pe->tgtport = NULL; | |
1312 | tgtport->pe = NULL; | |
1313 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * called when a new targetport is registered. Looks in the | |
1318 | * existing nvmet port_entries to see if the nvmet layer is | |
1319 | * configured for the targetport's wwn's. (the targetport existed, | |
1320 | * nvmet configured, the lldd unregistered the tgtport, and is now | |
1321 | * reregistering the same targetport). If so, set the nvmet port | |
1322 | * port entry on the targetport. | |
1323 | */ | |
1324 | static void | |
1325 | nvmet_fc_portentry_rebind_tgt(struct nvmet_fc_tgtport *tgtport) | |
1326 | { | |
1327 | struct nvmet_fc_port_entry *pe; | |
1328 | unsigned long flags; | |
1329 | ||
1330 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1331 | list_for_each_entry(pe, &nvmet_fc_portentry_list, pe_list) { | |
1332 | if (tgtport->fc_target_port.node_name == pe->node_name && | |
1333 | tgtport->fc_target_port.port_name == pe->port_name) { | |
1334 | WARN_ON(pe->tgtport); | |
1335 | tgtport->pe = pe; | |
1336 | pe->tgtport = tgtport; | |
1337 | break; | |
1338 | } | |
1339 | } | |
1340 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1341 | } | |
c5343203 JS |
1342 | |
1343 | /** | |
1344 | * nvme_fc_register_targetport - transport entry point called by an | |
1345 | * LLDD to register the existence of a local | |
1346 | * NVME subystem FC port. | |
1347 | * @pinfo: pointer to information about the port to be registered | |
1348 | * @template: LLDD entrypoints and operational parameters for the port | |
1349 | * @dev: physical hardware device node port corresponds to. Will be | |
1350 | * used for DMA mappings | |
1351 | * @portptr: pointer to a local port pointer. Upon success, the routine | |
1352 | * will allocate a nvme_fc_local_port structure and place its | |
1353 | * address in the local port pointer. Upon failure, local port | |
1354 | * pointer will be set to NULL. | |
1355 | * | |
1356 | * Returns: | |
1357 | * a completion status. Must be 0 upon success; a negative errno | |
1358 | * (ex: -ENXIO) upon failure. | |
1359 | */ | |
1360 | int | |
1361 | nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, | |
1362 | struct nvmet_fc_target_template *template, | |
1363 | struct device *dev, | |
1364 | struct nvmet_fc_target_port **portptr) | |
1365 | { | |
1366 | struct nvmet_fc_tgtport *newrec; | |
1367 | unsigned long flags; | |
1368 | int ret, idx; | |
1369 | ||
1370 | if (!template->xmt_ls_rsp || !template->fcp_op || | |
a97ec51b | 1371 | !template->fcp_abort || |
19b58d94 | 1372 | !template->fcp_req_release || !template->targetport_delete || |
c5343203 JS |
1373 | !template->max_hw_queues || !template->max_sgl_segments || |
1374 | !template->max_dif_sgl_segments || !template->dma_boundary) { | |
1375 | ret = -EINVAL; | |
1376 | goto out_regtgt_failed; | |
1377 | } | |
1378 | ||
1379 | newrec = kzalloc((sizeof(*newrec) + template->target_priv_sz), | |
1380 | GFP_KERNEL); | |
1381 | if (!newrec) { | |
1382 | ret = -ENOMEM; | |
1383 | goto out_regtgt_failed; | |
1384 | } | |
1385 | ||
1386 | idx = ida_simple_get(&nvmet_fc_tgtport_cnt, 0, 0, GFP_KERNEL); | |
1387 | if (idx < 0) { | |
1388 | ret = -ENOSPC; | |
1389 | goto out_fail_kfree; | |
1390 | } | |
1391 | ||
1392 | if (!get_device(dev) && dev) { | |
1393 | ret = -ENODEV; | |
1394 | goto out_ida_put; | |
1395 | } | |
1396 | ||
1397 | newrec->fc_target_port.node_name = pinfo->node_name; | |
1398 | newrec->fc_target_port.port_name = pinfo->port_name; | |
f56bf76f JS |
1399 | if (template->target_priv_sz) |
1400 | newrec->fc_target_port.private = &newrec[1]; | |
1401 | else | |
1402 | newrec->fc_target_port.private = NULL; | |
c5343203 JS |
1403 | newrec->fc_target_port.port_id = pinfo->port_id; |
1404 | newrec->fc_target_port.port_num = idx; | |
1405 | INIT_LIST_HEAD(&newrec->tgt_list); | |
1406 | newrec->dev = dev; | |
1407 | newrec->ops = template; | |
1408 | spin_lock_init(&newrec->lock); | |
349c694e | 1409 | INIT_LIST_HEAD(&newrec->ls_rcv_list); |
47bf3241 | 1410 | INIT_LIST_HEAD(&newrec->ls_req_list); |
c5343203 JS |
1411 | INIT_LIST_HEAD(&newrec->ls_busylist); |
1412 | INIT_LIST_HEAD(&newrec->assoc_list); | |
58ab8ff9 | 1413 | INIT_LIST_HEAD(&newrec->host_list); |
c5343203 JS |
1414 | kref_init(&newrec->ref); |
1415 | ida_init(&newrec->assoc_cnt); | |
d082dc15 | 1416 | newrec->max_sg_cnt = template->max_sgl_segments; |
c5343203 JS |
1417 | |
1418 | ret = nvmet_fc_alloc_ls_iodlist(newrec); | |
1419 | if (ret) { | |
1420 | ret = -ENOMEM; | |
1421 | goto out_free_newrec; | |
1422 | } | |
1423 | ||
ea96d649 JS |
1424 | nvmet_fc_portentry_rebind_tgt(newrec); |
1425 | ||
c5343203 JS |
1426 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); |
1427 | list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list); | |
1428 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1429 | ||
1430 | *portptr = &newrec->fc_target_port; | |
1431 | return 0; | |
1432 | ||
1433 | out_free_newrec: | |
1434 | put_device(dev); | |
1435 | out_ida_put: | |
1436 | ida_simple_remove(&nvmet_fc_tgtport_cnt, idx); | |
1437 | out_fail_kfree: | |
1438 | kfree(newrec); | |
1439 | out_regtgt_failed: | |
1440 | *portptr = NULL; | |
1441 | return ret; | |
1442 | } | |
1443 | EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport); | |
1444 | ||
1445 | ||
1446 | static void | |
1447 | nvmet_fc_free_tgtport(struct kref *ref) | |
1448 | { | |
1449 | struct nvmet_fc_tgtport *tgtport = | |
1450 | container_of(ref, struct nvmet_fc_tgtport, ref); | |
1451 | struct device *dev = tgtport->dev; | |
1452 | unsigned long flags; | |
1453 | ||
1454 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1455 | list_del(&tgtport->tgt_list); | |
1456 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1457 | ||
1458 | nvmet_fc_free_ls_iodlist(tgtport); | |
1459 | ||
1460 | /* let the LLDD know we've finished tearing it down */ | |
1461 | tgtport->ops->targetport_delete(&tgtport->fc_target_port); | |
1462 | ||
1463 | ida_simple_remove(&nvmet_fc_tgtport_cnt, | |
1464 | tgtport->fc_target_port.port_num); | |
1465 | ||
1466 | ida_destroy(&tgtport->assoc_cnt); | |
1467 | ||
1468 | kfree(tgtport); | |
1469 | ||
1470 | put_device(dev); | |
1471 | } | |
1472 | ||
1473 | static void | |
1474 | nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport) | |
1475 | { | |
1476 | kref_put(&tgtport->ref, nvmet_fc_free_tgtport); | |
1477 | } | |
1478 | ||
1479 | static int | |
1480 | nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport) | |
1481 | { | |
1482 | return kref_get_unless_zero(&tgtport->ref); | |
1483 | } | |
1484 | ||
1485 | static void | |
1486 | __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport) | |
1487 | { | |
4e2f02bf | 1488 | struct nvmet_fc_tgt_assoc *assoc; |
c5343203 | 1489 | |
4e2f02bf LR |
1490 | rcu_read_lock(); |
1491 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
c5343203 JS |
1492 | if (!nvmet_fc_tgt_a_get(assoc)) |
1493 | continue; | |
ece0278c | 1494 | if (!schedule_work(&assoc->del_work)) |
58ab8ff9 | 1495 | /* already deleting - release local reference */ |
0191e740 | 1496 | nvmet_fc_tgt_a_put(assoc); |
c5343203 | 1497 | } |
4e2f02bf | 1498 | rcu_read_unlock(); |
c5343203 JS |
1499 | } |
1500 | ||
72e6329f JS |
1501 | /** |
1502 | * nvmet_fc_invalidate_host - transport entry point called by an LLDD | |
1503 | * to remove references to a hosthandle for LS's. | |
1504 | * | |
1505 | * The nvmet-fc layer ensures that any references to the hosthandle | |
1506 | * on the targetport are forgotten (set to NULL). The LLDD will | |
1507 | * typically call this when a login with a remote host port has been | |
1508 | * lost, thus LS's for the remote host port are no longer possible. | |
1509 | * | |
1510 | * If an LS request is outstanding to the targetport/hosthandle (or | |
1511 | * issued concurrently with the call to invalidate the host), the | |
1512 | * LLDD is responsible for terminating/aborting the LS and completing | |
1513 | * the LS request. It is recommended that these terminations/aborts | |
1514 | * occur after calling to invalidate the host handle to avoid additional | |
1515 | * retries by the nvmet-fc transport. The nvmet-fc transport may | |
1516 | * continue to reference host handle while it cleans up outstanding | |
1517 | * NVME associations. The nvmet-fc transport will call the | |
1518 | * ops->host_release() callback to notify the LLDD that all references | |
1519 | * are complete and the related host handle can be recovered. | |
1520 | * Note: if there are no references, the callback may be called before | |
1521 | * the invalidate host call returns. | |
1522 | * | |
1523 | * @target_port: pointer to the (registered) target port that a prior | |
1524 | * LS was received on and which supplied the transport the | |
1525 | * hosthandle. | |
1526 | * @hosthandle: the handle (pointer) that represents the host port | |
1527 | * that no longer has connectivity and that LS's should | |
1528 | * no longer be directed to. | |
1529 | */ | |
1530 | void | |
1531 | nvmet_fc_invalidate_host(struct nvmet_fc_target_port *target_port, | |
1532 | void *hosthandle) | |
1533 | { | |
58ab8ff9 JS |
1534 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); |
1535 | struct nvmet_fc_tgt_assoc *assoc, *next; | |
1536 | unsigned long flags; | |
1537 | bool noassoc = true; | |
58ab8ff9 JS |
1538 | |
1539 | spin_lock_irqsave(&tgtport->lock, flags); | |
1540 | list_for_each_entry_safe(assoc, next, | |
1541 | &tgtport->assoc_list, a_list) { | |
1542 | if (!assoc->hostport || | |
1543 | assoc->hostport->hosthandle != hosthandle) | |
1544 | continue; | |
1545 | if (!nvmet_fc_tgt_a_get(assoc)) | |
1546 | continue; | |
1547 | assoc->hostport->invalid = 1; | |
1548 | noassoc = false; | |
ece0278c | 1549 | if (!schedule_work(&assoc->del_work)) |
58ab8ff9 JS |
1550 | /* already deleting - release local reference */ |
1551 | nvmet_fc_tgt_a_put(assoc); | |
58ab8ff9 JS |
1552 | } |
1553 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1554 | ||
1555 | /* if there's nothing to wait for - call the callback */ | |
1556 | if (noassoc && tgtport->ops->host_release) | |
1557 | tgtport->ops->host_release(hosthandle); | |
72e6329f JS |
1558 | } |
1559 | EXPORT_SYMBOL_GPL(nvmet_fc_invalidate_host); | |
1560 | ||
c5343203 JS |
1561 | /* |
1562 | * nvmet layer has called to terminate an association | |
1563 | */ | |
1564 | static void | |
1565 | nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl) | |
1566 | { | |
1567 | struct nvmet_fc_tgtport *tgtport, *next; | |
1568 | struct nvmet_fc_tgt_assoc *assoc; | |
1569 | struct nvmet_fc_tgt_queue *queue; | |
1570 | unsigned long flags; | |
1571 | bool found_ctrl = false; | |
1572 | ||
1573 | /* this is a bit ugly, but don't want to make locks layered */ | |
1574 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1575 | list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list, | |
1576 | tgt_list) { | |
1577 | if (!nvmet_fc_tgtport_get(tgtport)) | |
1578 | continue; | |
1579 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1580 | ||
4e2f02bf LR |
1581 | rcu_read_lock(); |
1582 | list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) { | |
1583 | queue = rcu_dereference(assoc->queues[0]); | |
c5343203 JS |
1584 | if (queue && queue->nvme_sq.ctrl == ctrl) { |
1585 | if (nvmet_fc_tgt_a_get(assoc)) | |
1586 | found_ctrl = true; | |
1587 | break; | |
1588 | } | |
1589 | } | |
4e2f02bf | 1590 | rcu_read_unlock(); |
c5343203 JS |
1591 | |
1592 | nvmet_fc_tgtport_put(tgtport); | |
1593 | ||
1594 | if (found_ctrl) { | |
ece0278c | 1595 | if (!schedule_work(&assoc->del_work)) |
58ab8ff9 | 1596 | /* already deleting - release local reference */ |
0191e740 | 1597 | nvmet_fc_tgt_a_put(assoc); |
c5343203 JS |
1598 | return; |
1599 | } | |
1600 | ||
1601 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
1602 | } | |
1603 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
1604 | } | |
1605 | ||
1606 | /** | |
1607 | * nvme_fc_unregister_targetport - transport entry point called by an | |
1608 | * LLDD to deregister/remove a previously | |
1609 | * registered a local NVME subsystem FC port. | |
1c466527 BVA |
1610 | * @target_port: pointer to the (registered) target port that is to be |
1611 | * deregistered. | |
c5343203 JS |
1612 | * |
1613 | * Returns: | |
1614 | * a completion status. Must be 0 upon success; a negative errno | |
1615 | * (ex: -ENXIO) upon failure. | |
1616 | */ | |
1617 | int | |
1618 | nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port) | |
1619 | { | |
1620 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
1621 | ||
ea96d649 JS |
1622 | nvmet_fc_portentry_unbind_tgt(tgtport); |
1623 | ||
c5343203 JS |
1624 | /* terminate any outstanding associations */ |
1625 | __nvmet_fc_free_assocs(tgtport); | |
1626 | ||
47bf3241 JS |
1627 | /* |
1628 | * should terminate LS's as well. However, LS's will be generated | |
1629 | * at the tail end of association termination, so they likely don't | |
1630 | * exist yet. And even if they did, it's worthwhile to just let | |
1631 | * them finish and targetport ref counting will clean things up. | |
1632 | */ | |
1633 | ||
c5343203 JS |
1634 | nvmet_fc_tgtport_put(tgtport); |
1635 | ||
1636 | return 0; | |
1637 | } | |
1638 | EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport); | |
1639 | ||
1640 | ||
47bf3241 | 1641 | /* ********************** FC-NVME LS RCV Handling ************************* */ |
c5343203 JS |
1642 | |
1643 | ||
c5343203 JS |
1644 | static void |
1645 | nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport, | |
1646 | struct nvmet_fc_ls_iod *iod) | |
1647 | { | |
3b8281b0 JS |
1648 | struct fcnvme_ls_cr_assoc_rqst *rqst = &iod->rqstbuf->rq_cr_assoc; |
1649 | struct fcnvme_ls_cr_assoc_acc *acc = &iod->rspbuf->rsp_cr_assoc; | |
c5343203 JS |
1650 | struct nvmet_fc_tgt_queue *queue; |
1651 | int ret = 0; | |
1652 | ||
1653 | memset(acc, 0, sizeof(*acc)); | |
1654 | ||
4cb7ca80 JS |
1655 | /* |
1656 | * FC-NVME spec changes. There are initiators sending different | |
1657 | * lengths as padding sizes for Create Association Cmd descriptor | |
1658 | * was incorrect. | |
1659 | * Accept anything of "minimum" length. Assume format per 1.15 | |
1660 | * spec (with HOSTID reduced to 16 bytes), ignore how long the | |
1661 | * trailing pad length is. | |
1662 | */ | |
1663 | if (iod->rqstdatalen < FCNVME_LSDESC_CRA_RQST_MINLEN) | |
c5343203 | 1664 | ret = VERR_CR_ASSOC_LEN; |
7722ecdc CH |
1665 | else if (be32_to_cpu(rqst->desc_list_len) < |
1666 | FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN) | |
c5343203 JS |
1667 | ret = VERR_CR_ASSOC_RQST_LEN; |
1668 | else if (rqst->assoc_cmd.desc_tag != | |
1669 | cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD)) | |
1670 | ret = VERR_CR_ASSOC_CMD; | |
7722ecdc CH |
1671 | else if (be32_to_cpu(rqst->assoc_cmd.desc_len) < |
1672 | FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN) | |
c5343203 JS |
1673 | ret = VERR_CR_ASSOC_CMD_LEN; |
1674 | else if (!rqst->assoc_cmd.ersp_ratio || | |
1675 | (be16_to_cpu(rqst->assoc_cmd.ersp_ratio) >= | |
1676 | be16_to_cpu(rqst->assoc_cmd.sqsize))) | |
1677 | ret = VERR_ERSP_RATIO; | |
1678 | ||
1679 | else { | |
1680 | /* new association w/ admin queue */ | |
58ab8ff9 JS |
1681 | iod->assoc = nvmet_fc_alloc_target_assoc( |
1682 | tgtport, iod->hosthandle); | |
c5343203 JS |
1683 | if (!iod->assoc) |
1684 | ret = VERR_ASSOC_ALLOC_FAIL; | |
1685 | else { | |
1686 | queue = nvmet_fc_alloc_target_queue(iod->assoc, 0, | |
1687 | be16_to_cpu(rqst->assoc_cmd.sqsize)); | |
1688 | if (!queue) | |
1689 | ret = VERR_QUEUE_ALLOC_FAIL; | |
1690 | } | |
1691 | } | |
1692 | ||
1693 | if (ret) { | |
1694 | dev_err(tgtport->dev, | |
1695 | "Create Association LS failed: %s\n", | |
1696 | validation_errors[ret]); | |
ca19bcd0 | 1697 | iod->lsrsp->rsplen = nvme_fc_format_rjt(acc, |
3b8281b0 | 1698 | sizeof(*acc), rqst->w0.ls_cmd, |
4083aa98 JS |
1699 | FCNVME_RJT_RC_LOGIC, |
1700 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1701 | return; |
1702 | } | |
1703 | ||
1704 | queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio); | |
1705 | atomic_set(&queue->connected, 1); | |
1706 | queue->sqhd = 0; /* best place to init value */ | |
1707 | ||
47bf3241 JS |
1708 | dev_info(tgtport->dev, |
1709 | "{%d:%d} Association created\n", | |
1710 | tgtport->fc_target_port.port_num, iod->assoc->a_id); | |
1711 | ||
c5343203 JS |
1712 | /* format a response */ |
1713 | ||
72e6329f | 1714 | iod->lsrsp->rsplen = sizeof(*acc); |
c5343203 | 1715 | |
ca19bcd0 | 1716 | nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, |
c5343203 JS |
1717 | fcnvme_lsdesc_len( |
1718 | sizeof(struct fcnvme_ls_cr_assoc_acc)), | |
1719 | FCNVME_LS_CREATE_ASSOCIATION); | |
1720 | acc->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID); | |
1721 | acc->associd.desc_len = | |
1722 | fcnvme_lsdesc_len( | |
1723 | sizeof(struct fcnvme_lsdesc_assoc_id)); | |
1724 | acc->associd.association_id = | |
1725 | cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, 0)); | |
1726 | acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); | |
1727 | acc->connectid.desc_len = | |
1728 | fcnvme_lsdesc_len( | |
1729 | sizeof(struct fcnvme_lsdesc_conn_id)); | |
1730 | acc->connectid.connection_id = acc->associd.association_id; | |
1731 | } | |
1732 | ||
1733 | static void | |
1734 | nvmet_fc_ls_create_connection(struct nvmet_fc_tgtport *tgtport, | |
1735 | struct nvmet_fc_ls_iod *iod) | |
1736 | { | |
3b8281b0 JS |
1737 | struct fcnvme_ls_cr_conn_rqst *rqst = &iod->rqstbuf->rq_cr_conn; |
1738 | struct fcnvme_ls_cr_conn_acc *acc = &iod->rspbuf->rsp_cr_conn; | |
c5343203 JS |
1739 | struct nvmet_fc_tgt_queue *queue; |
1740 | int ret = 0; | |
1741 | ||
1742 | memset(acc, 0, sizeof(*acc)); | |
1743 | ||
1744 | if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_conn_rqst)) | |
1745 | ret = VERR_CR_CONN_LEN; | |
1746 | else if (rqst->desc_list_len != | |
1747 | fcnvme_lsdesc_len( | |
1748 | sizeof(struct fcnvme_ls_cr_conn_rqst))) | |
1749 | ret = VERR_CR_CONN_RQST_LEN; | |
1750 | else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID)) | |
1751 | ret = VERR_ASSOC_ID; | |
1752 | else if (rqst->associd.desc_len != | |
1753 | fcnvme_lsdesc_len( | |
1754 | sizeof(struct fcnvme_lsdesc_assoc_id))) | |
1755 | ret = VERR_ASSOC_ID_LEN; | |
1756 | else if (rqst->connect_cmd.desc_tag != | |
1757 | cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD)) | |
1758 | ret = VERR_CR_CONN_CMD; | |
1759 | else if (rqst->connect_cmd.desc_len != | |
1760 | fcnvme_lsdesc_len( | |
1761 | sizeof(struct fcnvme_lsdesc_cr_conn_cmd))) | |
1762 | ret = VERR_CR_CONN_CMD_LEN; | |
1763 | else if (!rqst->connect_cmd.ersp_ratio || | |
1764 | (be16_to_cpu(rqst->connect_cmd.ersp_ratio) >= | |
1765 | be16_to_cpu(rqst->connect_cmd.sqsize))) | |
1766 | ret = VERR_ERSP_RATIO; | |
1767 | ||
1768 | else { | |
1769 | /* new io queue */ | |
1770 | iod->assoc = nvmet_fc_find_target_assoc(tgtport, | |
1771 | be64_to_cpu(rqst->associd.association_id)); | |
1772 | if (!iod->assoc) | |
1773 | ret = VERR_NO_ASSOC; | |
1774 | else { | |
1775 | queue = nvmet_fc_alloc_target_queue(iod->assoc, | |
1776 | be16_to_cpu(rqst->connect_cmd.qid), | |
1777 | be16_to_cpu(rqst->connect_cmd.sqsize)); | |
1778 | if (!queue) | |
1779 | ret = VERR_QUEUE_ALLOC_FAIL; | |
1780 | ||
1781 | /* release get taken in nvmet_fc_find_target_assoc */ | |
1782 | nvmet_fc_tgt_a_put(iod->assoc); | |
1783 | } | |
1784 | } | |
1785 | ||
1786 | if (ret) { | |
1787 | dev_err(tgtport->dev, | |
1788 | "Create Connection LS failed: %s\n", | |
1789 | validation_errors[ret]); | |
ca19bcd0 | 1790 | iod->lsrsp->rsplen = nvme_fc_format_rjt(acc, |
3b8281b0 | 1791 | sizeof(*acc), rqst->w0.ls_cmd, |
c5343203 | 1792 | (ret == VERR_NO_ASSOC) ? |
4083aa98 JS |
1793 | FCNVME_RJT_RC_INV_ASSOC : |
1794 | FCNVME_RJT_RC_LOGIC, | |
1795 | FCNVME_RJT_EXP_NONE, 0); | |
c5343203 JS |
1796 | return; |
1797 | } | |
1798 | ||
1799 | queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio); | |
1800 | atomic_set(&queue->connected, 1); | |
1801 | queue->sqhd = 0; /* best place to init value */ | |
1802 | ||
1803 | /* format a response */ | |
1804 | ||
72e6329f | 1805 | iod->lsrsp->rsplen = sizeof(*acc); |
c5343203 | 1806 | |
ca19bcd0 | 1807 | nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, |
c5343203 JS |
1808 | fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)), |
1809 | FCNVME_LS_CREATE_CONNECTION); | |
1810 | acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID); | |
1811 | acc->connectid.desc_len = | |
1812 | fcnvme_lsdesc_len( | |
1813 | sizeof(struct fcnvme_lsdesc_conn_id)); | |
1814 | acc->connectid.connection_id = | |
1815 | cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, | |
1816 | be16_to_cpu(rqst->connect_cmd.qid))); | |
1817 | } | |
1818 | ||
47bf3241 JS |
1819 | /* |
1820 | * Returns true if the LS response is to be transmit | |
1821 | * Returns false if the LS response is to be delayed | |
1822 | */ | |
1823 | static int | |
c5343203 JS |
1824 | nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport, |
1825 | struct nvmet_fc_ls_iod *iod) | |
1826 | { | |
53b2b2f5 | 1827 | struct fcnvme_ls_disconnect_assoc_rqst *rqst = |
3b8281b0 | 1828 | &iod->rqstbuf->rq_dis_assoc; |
53b2b2f5 | 1829 | struct fcnvme_ls_disconnect_assoc_acc *acc = |
3b8281b0 | 1830 | &iod->rspbuf->rsp_dis_assoc; |
e4fcc72c | 1831 | struct nvmet_fc_tgt_assoc *assoc = NULL; |
47bf3241 JS |
1832 | struct nvmet_fc_ls_iod *oldls = NULL; |
1833 | unsigned long flags; | |
c5343203 | 1834 | int ret = 0; |
c5343203 JS |
1835 | |
1836 | memset(acc, 0, sizeof(*acc)); | |
1837 | ||
ec3b0e3c JS |
1838 | ret = nvmefc_vldt_lsreq_discon_assoc(iod->rqstdatalen, rqst); |
1839 | if (!ret) { | |
47bf3241 | 1840 | /* match an active association - takes an assoc ref if !NULL */ |
c5343203 JS |
1841 | assoc = nvmet_fc_find_target_assoc(tgtport, |
1842 | be64_to_cpu(rqst->associd.association_id)); | |
1843 | iod->assoc = assoc; | |
404ec31d | 1844 | if (!assoc) |
c5343203 JS |
1845 | ret = VERR_NO_ASSOC; |
1846 | } | |
1847 | ||
e4fcc72c | 1848 | if (ret || !assoc) { |
c5343203 JS |
1849 | dev_err(tgtport->dev, |
1850 | "Disconnect LS failed: %s\n", | |
1851 | validation_errors[ret]); | |
ca19bcd0 | 1852 | iod->lsrsp->rsplen = nvme_fc_format_rjt(acc, |
3b8281b0 | 1853 | sizeof(*acc), rqst->w0.ls_cmd, |
4083aa98 JS |
1854 | (ret == VERR_NO_ASSOC) ? |
1855 | FCNVME_RJT_RC_INV_ASSOC : | |
ca19bcd0 | 1856 | FCNVME_RJT_RC_LOGIC, |
4083aa98 | 1857 | FCNVME_RJT_EXP_NONE, 0); |
47bf3241 | 1858 | return true; |
c5343203 JS |
1859 | } |
1860 | ||
1861 | /* format a response */ | |
1862 | ||
72e6329f | 1863 | iod->lsrsp->rsplen = sizeof(*acc); |
c5343203 | 1864 | |
ca19bcd0 | 1865 | nvme_fc_format_rsp_hdr(acc, FCNVME_LS_ACC, |
c5343203 | 1866 | fcnvme_lsdesc_len( |
53b2b2f5 JS |
1867 | sizeof(struct fcnvme_ls_disconnect_assoc_acc)), |
1868 | FCNVME_LS_DISCONNECT_ASSOC); | |
c5343203 | 1869 | |
c5343203 | 1870 | /* release get taken in nvmet_fc_find_target_assoc */ |
47bf3241 JS |
1871 | nvmet_fc_tgt_a_put(assoc); |
1872 | ||
1873 | /* | |
1874 | * The rules for LS response says the response cannot | |
1875 | * go back until ABTS's have been sent for all outstanding | |
1876 | * I/O and a Disconnect Association LS has been sent. | |
1877 | * So... save off the Disconnect LS to send the response | |
1878 | * later. If there was a prior LS already saved, replace | |
1879 | * it with the newer one and send a can't perform reject | |
1880 | * on the older one. | |
1881 | */ | |
1882 | spin_lock_irqsave(&tgtport->lock, flags); | |
1883 | oldls = assoc->rcv_disconn; | |
1884 | assoc->rcv_disconn = iod; | |
1885 | spin_unlock_irqrestore(&tgtport->lock, flags); | |
1886 | ||
1887 | nvmet_fc_delete_target_assoc(assoc); | |
1888 | ||
1889 | if (oldls) { | |
1890 | dev_info(tgtport->dev, | |
1891 | "{%d:%d} Multiple Disconnect Association LS's " | |
1892 | "received\n", | |
1893 | tgtport->fc_target_port.port_num, assoc->a_id); | |
1894 | /* overwrite good response with bogus failure */ | |
1895 | oldls->lsrsp->rsplen = nvme_fc_format_rjt(oldls->rspbuf, | |
1896 | sizeof(*iod->rspbuf), | |
1897 | /* ok to use rqst, LS is same */ | |
1898 | rqst->w0.ls_cmd, | |
1899 | FCNVME_RJT_RC_UNAB, | |
1900 | FCNVME_RJT_EXP_NONE, 0); | |
1901 | nvmet_fc_xmt_ls_rsp(tgtport, oldls); | |
1902 | } | |
c5343203 | 1903 | |
47bf3241 | 1904 | return false; |
c5343203 JS |
1905 | } |
1906 | ||
1907 | ||
1908 | /* *********************** NVME Ctrl Routines **************************** */ | |
1909 | ||
1910 | ||
1911 | static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req); | |
1912 | ||
e929f06d | 1913 | static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops; |
c5343203 JS |
1914 | |
1915 | static void | |
72e6329f | 1916 | nvmet_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp) |
c5343203 | 1917 | { |
72e6329f | 1918 | struct nvmet_fc_ls_iod *iod = lsrsp->nvme_fc_private; |
c5343203 JS |
1919 | struct nvmet_fc_tgtport *tgtport = iod->tgtport; |
1920 | ||
1921 | fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma, | |
3b8281b0 | 1922 | sizeof(*iod->rspbuf), DMA_TO_DEVICE); |
c5343203 JS |
1923 | nvmet_fc_free_ls_iod(tgtport, iod); |
1924 | nvmet_fc_tgtport_put(tgtport); | |
1925 | } | |
1926 | ||
1927 | static void | |
1928 | nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, | |
1929 | struct nvmet_fc_ls_iod *iod) | |
1930 | { | |
1931 | int ret; | |
1932 | ||
1933 | fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma, | |
3b8281b0 | 1934 | sizeof(*iod->rspbuf), DMA_TO_DEVICE); |
c5343203 | 1935 | |
72e6329f | 1936 | ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsrsp); |
c5343203 | 1937 | if (ret) |
72e6329f | 1938 | nvmet_fc_xmt_ls_rsp_done(iod->lsrsp); |
c5343203 JS |
1939 | } |
1940 | ||
1941 | /* | |
1942 | * Actual processing routine for received FC-NVME LS Requests from the LLD | |
1943 | */ | |
1944 | static void | |
1945 | nvmet_fc_handle_ls_rqst(struct nvmet_fc_tgtport *tgtport, | |
1946 | struct nvmet_fc_ls_iod *iod) | |
1947 | { | |
3b8281b0 | 1948 | struct fcnvme_ls_rqst_w0 *w0 = &iod->rqstbuf->rq_cr_assoc.w0; |
47bf3241 | 1949 | bool sendrsp = true; |
c5343203 | 1950 | |
72e6329f JS |
1951 | iod->lsrsp->nvme_fc_private = iod; |
1952 | iod->lsrsp->rspbuf = iod->rspbuf; | |
1953 | iod->lsrsp->rspdma = iod->rspdma; | |
1954 | iod->lsrsp->done = nvmet_fc_xmt_ls_rsp_done; | |
c5343203 | 1955 | /* Be preventative. handlers will later set to valid length */ |
72e6329f | 1956 | iod->lsrsp->rsplen = 0; |
c5343203 JS |
1957 | |
1958 | iod->assoc = NULL; | |
1959 | ||
1960 | /* | |
1961 | * handlers: | |
1962 | * parse request input, execute the request, and format the | |
1963 | * LS response | |
1964 | */ | |
1965 | switch (w0->ls_cmd) { | |
1966 | case FCNVME_LS_CREATE_ASSOCIATION: | |
1967 | /* Creates Association and initial Admin Queue/Connection */ | |
1968 | nvmet_fc_ls_create_association(tgtport, iod); | |
1969 | break; | |
1970 | case FCNVME_LS_CREATE_CONNECTION: | |
1971 | /* Creates an IO Queue/Connection */ | |
1972 | nvmet_fc_ls_create_connection(tgtport, iod); | |
1973 | break; | |
53b2b2f5 | 1974 | case FCNVME_LS_DISCONNECT_ASSOC: |
c5343203 | 1975 | /* Terminate a Queue/Connection or the Association */ |
47bf3241 | 1976 | sendrsp = nvmet_fc_ls_disconnect(tgtport, iod); |
c5343203 JS |
1977 | break; |
1978 | default: | |
ca19bcd0 | 1979 | iod->lsrsp->rsplen = nvme_fc_format_rjt(iod->rspbuf, |
3b8281b0 | 1980 | sizeof(*iod->rspbuf), w0->ls_cmd, |
4083aa98 | 1981 | FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0); |
c5343203 JS |
1982 | } |
1983 | ||
47bf3241 JS |
1984 | if (sendrsp) |
1985 | nvmet_fc_xmt_ls_rsp(tgtport, iod); | |
c5343203 JS |
1986 | } |
1987 | ||
1988 | /* | |
1989 | * Actual processing routine for received FC-NVME LS Requests from the LLD | |
1990 | */ | |
1991 | static void | |
1992 | nvmet_fc_handle_ls_rqst_work(struct work_struct *work) | |
1993 | { | |
1994 | struct nvmet_fc_ls_iod *iod = | |
1995 | container_of(work, struct nvmet_fc_ls_iod, work); | |
1996 | struct nvmet_fc_tgtport *tgtport = iod->tgtport; | |
1997 | ||
1998 | nvmet_fc_handle_ls_rqst(tgtport, iod); | |
1999 | } | |
2000 | ||
2001 | ||
2002 | /** | |
2003 | * nvmet_fc_rcv_ls_req - transport entry point called by an LLDD | |
2004 | * upon the reception of a NVME LS request. | |
2005 | * | |
2006 | * The nvmet-fc layer will copy payload to an internal structure for | |
2007 | * processing. As such, upon completion of the routine, the LLDD may | |
2008 | * immediately free/reuse the LS request buffer passed in the call. | |
2009 | * | |
2010 | * If this routine returns error, the LLDD should abort the exchange. | |
2011 | * | |
1c466527 | 2012 | * @target_port: pointer to the (registered) target port the LS was |
c5343203 | 2013 | * received on. |
b53d4741 | 2014 | * @hosthandle: pointer to the host specific data, gets stored in iod. |
72e6329f | 2015 | * @lsrsp: pointer to a lsrsp structure to be used to reference |
c5343203 JS |
2016 | * the exchange corresponding to the LS. |
2017 | * @lsreqbuf: pointer to the buffer containing the LS Request | |
2018 | * @lsreqbuf_len: length, in bytes, of the received LS request | |
2019 | */ | |
2020 | int | |
2021 | nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port, | |
72e6329f JS |
2022 | void *hosthandle, |
2023 | struct nvmefc_ls_rsp *lsrsp, | |
c5343203 JS |
2024 | void *lsreqbuf, u32 lsreqbuf_len) |
2025 | { | |
2026 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
2027 | struct nvmet_fc_ls_iod *iod; | |
a5c2b4f6 JS |
2028 | struct fcnvme_ls_rqst_w0 *w0 = (struct fcnvme_ls_rqst_w0 *)lsreqbuf; |
2029 | ||
2030 | if (lsreqbuf_len > sizeof(union nvmefc_ls_requests)) { | |
2031 | dev_info(tgtport->dev, | |
2032 | "RCV %s LS failed: payload too large (%d)\n", | |
2033 | (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ? | |
2034 | nvmefc_ls_names[w0->ls_cmd] : "", | |
2035 | lsreqbuf_len); | |
c5343203 | 2036 | return -E2BIG; |
a5c2b4f6 | 2037 | } |
c5343203 | 2038 | |
a5c2b4f6 JS |
2039 | if (!nvmet_fc_tgtport_get(tgtport)) { |
2040 | dev_info(tgtport->dev, | |
2041 | "RCV %s LS failed: target deleting\n", | |
2042 | (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ? | |
2043 | nvmefc_ls_names[w0->ls_cmd] : ""); | |
c5343203 | 2044 | return -ESHUTDOWN; |
a5c2b4f6 | 2045 | } |
c5343203 JS |
2046 | |
2047 | iod = nvmet_fc_alloc_ls_iod(tgtport); | |
2048 | if (!iod) { | |
a5c2b4f6 JS |
2049 | dev_info(tgtport->dev, |
2050 | "RCV %s LS failed: context allocation failed\n", | |
2051 | (w0->ls_cmd <= NVME_FC_LAST_LS_CMD_VALUE) ? | |
2052 | nvmefc_ls_names[w0->ls_cmd] : ""); | |
c5343203 JS |
2053 | nvmet_fc_tgtport_put(tgtport); |
2054 | return -ENOENT; | |
2055 | } | |
2056 | ||
72e6329f | 2057 | iod->lsrsp = lsrsp; |
c5343203 JS |
2058 | iod->fcpreq = NULL; |
2059 | memcpy(iod->rqstbuf, lsreqbuf, lsreqbuf_len); | |
2060 | iod->rqstdatalen = lsreqbuf_len; | |
58ab8ff9 | 2061 | iod->hosthandle = hosthandle; |
c5343203 JS |
2062 | |
2063 | schedule_work(&iod->work); | |
2064 | ||
2065 | return 0; | |
2066 | } | |
2067 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_ls_req); | |
2068 | ||
2069 | ||
2070 | /* | |
2071 | * ********************** | |
2072 | * Start of FCP handling | |
2073 | * ********************** | |
2074 | */ | |
2075 | ||
2076 | static int | |
2077 | nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod) | |
2078 | { | |
2079 | struct scatterlist *sg; | |
c5343203 | 2080 | unsigned int nent; |
c5343203 | 2081 | |
4442b56f | 2082 | sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent); |
c5343203 JS |
2083 | if (!sg) |
2084 | goto out; | |
2085 | ||
c5343203 JS |
2086 | fod->data_sg = sg; |
2087 | fod->data_sg_cnt = nent; | |
2088 | fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent, | |
2089 | ((fod->io_dir == NVMET_FCP_WRITE) ? | |
2090 | DMA_FROM_DEVICE : DMA_TO_DEVICE)); | |
2091 | /* note: write from initiator perspective */ | |
d082dc15 | 2092 | fod->next_sg = fod->data_sg; |
c5343203 JS |
2093 | |
2094 | return 0; | |
2095 | ||
c5343203 JS |
2096 | out: |
2097 | return NVME_SC_INTERNAL; | |
2098 | } | |
2099 | ||
2100 | static void | |
2101 | nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod) | |
2102 | { | |
c5343203 JS |
2103 | if (!fod->data_sg || !fod->data_sg_cnt) |
2104 | return; | |
2105 | ||
2106 | fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt, | |
2107 | ((fod->io_dir == NVMET_FCP_WRITE) ? | |
2108 | DMA_FROM_DEVICE : DMA_TO_DEVICE)); | |
4442b56f | 2109 | sgl_free(fod->data_sg); |
c820ad4c JS |
2110 | fod->data_sg = NULL; |
2111 | fod->data_sg_cnt = 0; | |
c5343203 JS |
2112 | } |
2113 | ||
2114 | ||
2115 | static bool | |
2116 | queue_90percent_full(struct nvmet_fc_tgt_queue *q, u32 sqhd) | |
2117 | { | |
2118 | u32 sqtail, used; | |
2119 | ||
2120 | /* egad, this is ugly. And sqtail is just a best guess */ | |
2121 | sqtail = atomic_read(&q->sqtail) % q->sqsize; | |
2122 | ||
2123 | used = (sqtail < sqhd) ? (sqtail + q->sqsize - sqhd) : (sqtail - sqhd); | |
2124 | return ((used * 10) >= (((u32)(q->sqsize - 1) * 9))); | |
2125 | } | |
2126 | ||
2127 | /* | |
2128 | * Prep RSP payload. | |
2129 | * May be a NVMET_FCOP_RSP or NVMET_FCOP_READDATA_RSP op | |
2130 | */ | |
2131 | static void | |
2132 | nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, | |
2133 | struct nvmet_fc_fcp_iod *fod) | |
2134 | { | |
2135 | struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf; | |
2136 | struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; | |
2137 | struct nvme_completion *cqe = &ersp->cqe; | |
2138 | u32 *cqewd = (u32 *)cqe; | |
2139 | bool send_ersp = false; | |
2140 | u32 rsn, rspcnt, xfr_length; | |
2141 | ||
2142 | if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP) | |
5e62d5c9 | 2143 | xfr_length = fod->req.transfer_len; |
c5343203 JS |
2144 | else |
2145 | xfr_length = fod->offset; | |
2146 | ||
2147 | /* | |
2148 | * check to see if we can send a 0's rsp. | |
2149 | * Note: to send a 0's response, the NVME-FC host transport will | |
2150 | * recreate the CQE. The host transport knows: sq id, SQHD (last | |
2151 | * seen in an ersp), and command_id. Thus it will create a | |
2152 | * zero-filled CQE with those known fields filled in. Transport | |
2153 | * must send an ersp for any condition where the cqe won't match | |
2154 | * this. | |
2155 | * | |
2156 | * Here are the FC-NVME mandated cases where we must send an ersp: | |
2157 | * every N responses, where N=ersp_ratio | |
2158 | * force fabric commands to send ersp's (not in FC-NVME but good | |
2159 | * practice) | |
2160 | * normal cmds: any time status is non-zero, or status is zero | |
2161 | * but words 0 or 1 are non-zero. | |
2162 | * the SQ is 90% or more full | |
2163 | * the cmd is a fused command | |
2164 | * transferred data length not equal to cmd iu length | |
2165 | */ | |
2166 | rspcnt = atomic_inc_return(&fod->queue->zrspcnt); | |
2167 | if (!(rspcnt % fod->queue->ersp_ratio) || | |
7a1f46e3 | 2168 | nvme_is_fabrics((struct nvme_command *) sqe) || |
5e62d5c9 | 2169 | xfr_length != fod->req.transfer_len || |
c5343203 JS |
2170 | (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] || |
2171 | (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) || | |
8ad76cf1 | 2172 | queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head))) |
c5343203 JS |
2173 | send_ersp = true; |
2174 | ||
2175 | /* re-set the fields */ | |
2176 | fod->fcpreq->rspaddr = ersp; | |
2177 | fod->fcpreq->rspdma = fod->rspdma; | |
2178 | ||
2179 | if (!send_ersp) { | |
2180 | memset(ersp, 0, NVME_FC_SIZEOF_ZEROS_RSP); | |
2181 | fod->fcpreq->rsplen = NVME_FC_SIZEOF_ZEROS_RSP; | |
2182 | } else { | |
2183 | ersp->iu_len = cpu_to_be16(sizeof(*ersp)/sizeof(u32)); | |
2184 | rsn = atomic_inc_return(&fod->queue->rsn); | |
2185 | ersp->rsn = cpu_to_be32(rsn); | |
2186 | ersp->xfrd_len = cpu_to_be32(xfr_length); | |
2187 | fod->fcpreq->rsplen = sizeof(*ersp); | |
2188 | } | |
2189 | ||
2190 | fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma, | |
2191 | sizeof(fod->rspiubuf), DMA_TO_DEVICE); | |
2192 | } | |
2193 | ||
2194 | static void nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq); | |
2195 | ||
a97ec51b JS |
2196 | static void |
2197 | nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport, | |
2198 | struct nvmet_fc_fcp_iod *fod) | |
2199 | { | |
2200 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
2201 | ||
2202 | /* data no longer needed */ | |
2203 | nvmet_fc_free_tgt_pgs(fod); | |
2204 | ||
2205 | /* | |
2206 | * if an ABTS was received or we issued the fcp_abort early | |
2207 | * don't call abort routine again. | |
2208 | */ | |
2209 | /* no need to take lock - lock was taken earlier to get here */ | |
2210 | if (!fod->aborted) | |
2211 | tgtport->ops->fcp_abort(&tgtport->fc_target_port, fcpreq); | |
2212 | ||
2213 | nvmet_fc_free_fcp_iod(fod->queue, fod); | |
2214 | } | |
2215 | ||
c5343203 JS |
2216 | static void |
2217 | nvmet_fc_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport, | |
2218 | struct nvmet_fc_fcp_iod *fod) | |
2219 | { | |
2220 | int ret; | |
2221 | ||
2222 | fod->fcpreq->op = NVMET_FCOP_RSP; | |
2223 | fod->fcpreq->timeout = 0; | |
2224 | ||
2225 | nvmet_fc_prep_fcp_rsp(tgtport, fod); | |
2226 | ||
2227 | ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); | |
2228 | if (ret) | |
a97ec51b | 2229 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2230 | } |
2231 | ||
2232 | static void | |
2233 | nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, | |
2234 | struct nvmet_fc_fcp_iod *fod, u8 op) | |
2235 | { | |
2236 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
d082dc15 | 2237 | struct scatterlist *sg = fod->next_sg; |
a97ec51b | 2238 | unsigned long flags; |
d082dc15 JS |
2239 | u32 remaininglen = fod->req.transfer_len - fod->offset; |
2240 | u32 tlen = 0; | |
c5343203 JS |
2241 | int ret; |
2242 | ||
2243 | fcpreq->op = op; | |
2244 | fcpreq->offset = fod->offset; | |
2245 | fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC; | |
48fa362b | 2246 | |
d082dc15 JS |
2247 | /* |
2248 | * for next sequence: | |
2249 | * break at a sg element boundary | |
2250 | * attempt to keep sequence length capped at | |
2251 | * NVMET_FC_MAX_SEQ_LENGTH but allow sequence to | |
2252 | * be longer if a single sg element is larger | |
2253 | * than that amount. This is done to avoid creating | |
2254 | * a new sg list to use for the tgtport api. | |
2255 | */ | |
2256 | fcpreq->sg = sg; | |
2257 | fcpreq->sg_cnt = 0; | |
2258 | while (tlen < remaininglen && | |
2259 | fcpreq->sg_cnt < tgtport->max_sg_cnt && | |
2260 | tlen + sg_dma_len(sg) < NVMET_FC_MAX_SEQ_LENGTH) { | |
2261 | fcpreq->sg_cnt++; | |
2262 | tlen += sg_dma_len(sg); | |
2263 | sg = sg_next(sg); | |
2264 | } | |
2265 | if (tlen < remaininglen && fcpreq->sg_cnt == 0) { | |
2266 | fcpreq->sg_cnt++; | |
2267 | tlen += min_t(u32, sg_dma_len(sg), remaininglen); | |
2268 | sg = sg_next(sg); | |
2269 | } | |
2270 | if (tlen < remaininglen) | |
2271 | fod->next_sg = sg; | |
2272 | else | |
2273 | fod->next_sg = NULL; | |
2274 | ||
c5343203 JS |
2275 | fcpreq->transfer_length = tlen; |
2276 | fcpreq->transferred_length = 0; | |
2277 | fcpreq->fcp_error = 0; | |
2278 | fcpreq->rsplen = 0; | |
2279 | ||
c5343203 JS |
2280 | /* |
2281 | * If the last READDATA request: check if LLDD supports | |
2282 | * combined xfr with response. | |
2283 | */ | |
2284 | if ((op == NVMET_FCOP_READDATA) && | |
5e62d5c9 | 2285 | ((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) && |
c5343203 JS |
2286 | (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) { |
2287 | fcpreq->op = NVMET_FCOP_READDATA_RSP; | |
2288 | nvmet_fc_prep_fcp_rsp(tgtport, fod); | |
2289 | } | |
2290 | ||
2291 | ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq); | |
2292 | if (ret) { | |
2293 | /* | |
2294 | * should be ok to set w/o lock as its in the thread of | |
2295 | * execution (not an async timer routine) and doesn't | |
2296 | * contend with any clearing action | |
2297 | */ | |
2298 | fod->abort = true; | |
2299 | ||
a97ec51b JS |
2300 | if (op == NVMET_FCOP_WRITEDATA) { |
2301 | spin_lock_irqsave(&fod->flock, flags); | |
2302 | fod->writedataactive = false; | |
2303 | spin_unlock_irqrestore(&fod->flock, flags); | |
29b3d26e | 2304 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
a97ec51b | 2305 | } else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ { |
c5343203 JS |
2306 | fcpreq->fcp_error = ret; |
2307 | fcpreq->transferred_length = 0; | |
2308 | nvmet_fc_xmt_fcp_op_done(fod->fcpreq); | |
2309 | } | |
2310 | } | |
2311 | } | |
2312 | ||
a97ec51b JS |
2313 | static inline bool |
2314 | __nvmet_fc_fod_op_abort(struct nvmet_fc_fcp_iod *fod, bool abort) | |
2315 | { | |
2316 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; | |
2317 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
2318 | ||
2319 | /* if in the middle of an io and we need to tear down */ | |
2320 | if (abort) { | |
2321 | if (fcpreq->op == NVMET_FCOP_WRITEDATA) { | |
29b3d26e | 2322 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
a97ec51b JS |
2323 | return true; |
2324 | } | |
2325 | ||
2326 | nvmet_fc_abort_op(tgtport, fod); | |
2327 | return true; | |
2328 | } | |
2329 | ||
2330 | return false; | |
2331 | } | |
2332 | ||
39498fae JS |
2333 | /* |
2334 | * actual done handler for FCP operations when completed by the lldd | |
2335 | */ | |
c5343203 | 2336 | static void |
39498fae | 2337 | nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) |
c5343203 | 2338 | { |
39498fae | 2339 | struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; |
c5343203 JS |
2340 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; |
2341 | unsigned long flags; | |
2342 | bool abort; | |
2343 | ||
2344 | spin_lock_irqsave(&fod->flock, flags); | |
2345 | abort = fod->abort; | |
a97ec51b | 2346 | fod->writedataactive = false; |
c5343203 JS |
2347 | spin_unlock_irqrestore(&fod->flock, flags); |
2348 | ||
c5343203 JS |
2349 | switch (fcpreq->op) { |
2350 | ||
2351 | case NVMET_FCOP_WRITEDATA: | |
a97ec51b JS |
2352 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2353 | return; | |
f64935ab | 2354 | if (fcpreq->fcp_error || |
c5343203 | 2355 | fcpreq->transferred_length != fcpreq->transfer_length) { |
70e37988 | 2356 | spin_lock_irqsave(&fod->flock, flags); |
a97ec51b | 2357 | fod->abort = true; |
70e37988 | 2358 | spin_unlock_irqrestore(&fod->flock, flags); |
a97ec51b | 2359 | |
29b3d26e | 2360 | nvmet_req_complete(&fod->req, NVME_SC_INTERNAL); |
c5343203 JS |
2361 | return; |
2362 | } | |
2363 | ||
2364 | fod->offset += fcpreq->transferred_length; | |
5e62d5c9 | 2365 | if (fod->offset != fod->req.transfer_len) { |
a97ec51b JS |
2366 | spin_lock_irqsave(&fod->flock, flags); |
2367 | fod->writedataactive = true; | |
2368 | spin_unlock_irqrestore(&fod->flock, flags); | |
2369 | ||
c5343203 JS |
2370 | /* transfer the next chunk */ |
2371 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2372 | NVMET_FCOP_WRITEDATA); | |
2373 | return; | |
2374 | } | |
2375 | ||
2376 | /* data transfer complete, resume with nvmet layer */ | |
be3f3114 | 2377 | fod->req.execute(&fod->req); |
c5343203 JS |
2378 | break; |
2379 | ||
2380 | case NVMET_FCOP_READDATA: | |
2381 | case NVMET_FCOP_READDATA_RSP: | |
a97ec51b JS |
2382 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2383 | return; | |
f64935ab | 2384 | if (fcpreq->fcp_error || |
c5343203 | 2385 | fcpreq->transferred_length != fcpreq->transfer_length) { |
a97ec51b | 2386 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2387 | return; |
2388 | } | |
2389 | ||
2390 | /* success */ | |
2391 | ||
2392 | if (fcpreq->op == NVMET_FCOP_READDATA_RSP) { | |
2393 | /* data no longer needed */ | |
2394 | nvmet_fc_free_tgt_pgs(fod); | |
c5343203 JS |
2395 | nvmet_fc_free_fcp_iod(fod->queue, fod); |
2396 | return; | |
2397 | } | |
2398 | ||
2399 | fod->offset += fcpreq->transferred_length; | |
5e62d5c9 | 2400 | if (fod->offset != fod->req.transfer_len) { |
c5343203 JS |
2401 | /* transfer the next chunk */ |
2402 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2403 | NVMET_FCOP_READDATA); | |
2404 | return; | |
2405 | } | |
2406 | ||
2407 | /* data transfer complete, send response */ | |
2408 | ||
2409 | /* data no longer needed */ | |
2410 | nvmet_fc_free_tgt_pgs(fod); | |
2411 | ||
2412 | nvmet_fc_xmt_fcp_rsp(tgtport, fod); | |
2413 | ||
2414 | break; | |
2415 | ||
2416 | case NVMET_FCOP_RSP: | |
a97ec51b JS |
2417 | if (__nvmet_fc_fod_op_abort(fod, abort)) |
2418 | return; | |
c5343203 JS |
2419 | nvmet_fc_free_fcp_iod(fod->queue, fod); |
2420 | break; | |
2421 | ||
2422 | default: | |
c5343203 JS |
2423 | break; |
2424 | } | |
2425 | } | |
2426 | ||
39498fae JS |
2427 | static void |
2428 | nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq) | |
2429 | { | |
2430 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
39498fae | 2431 | |
6e2e312e | 2432 | nvmet_fc_fod_op_done(fod); |
39498fae JS |
2433 | } |
2434 | ||
c5343203 JS |
2435 | /* |
2436 | * actual completion handler after execution by the nvmet layer | |
2437 | */ | |
2438 | static void | |
2439 | __nvmet_fc_fcp_nvme_cmd_done(struct nvmet_fc_tgtport *tgtport, | |
2440 | struct nvmet_fc_fcp_iod *fod, int status) | |
2441 | { | |
2442 | struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common; | |
2443 | struct nvme_completion *cqe = &fod->rspiubuf.cqe; | |
2444 | unsigned long flags; | |
2445 | bool abort; | |
2446 | ||
2447 | spin_lock_irqsave(&fod->flock, flags); | |
2448 | abort = fod->abort; | |
2449 | spin_unlock_irqrestore(&fod->flock, flags); | |
2450 | ||
2451 | /* if we have a CQE, snoop the last sq_head value */ | |
2452 | if (!status) | |
2453 | fod->queue->sqhd = cqe->sq_head; | |
2454 | ||
2455 | if (abort) { | |
a97ec51b | 2456 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2457 | return; |
2458 | } | |
2459 | ||
2460 | /* if an error handling the cmd post initial parsing */ | |
2461 | if (status) { | |
2462 | /* fudge up a failed CQE status for our transport error */ | |
2463 | memset(cqe, 0, sizeof(*cqe)); | |
2464 | cqe->sq_head = fod->queue->sqhd; /* echo last cqe sqhd */ | |
2465 | cqe->sq_id = cpu_to_le16(fod->queue->qid); | |
2466 | cqe->command_id = sqe->command_id; | |
2467 | cqe->status = cpu_to_le16(status); | |
2468 | } else { | |
2469 | ||
2470 | /* | |
2471 | * try to push the data even if the SQE status is non-zero. | |
2472 | * There may be a status where data still was intended to | |
2473 | * be moved | |
2474 | */ | |
2475 | if ((fod->io_dir == NVMET_FCP_READ) && (fod->data_sg_cnt)) { | |
2476 | /* push the data over before sending rsp */ | |
2477 | nvmet_fc_transfer_fcp_data(tgtport, fod, | |
2478 | NVMET_FCOP_READDATA); | |
2479 | return; | |
2480 | } | |
2481 | ||
2482 | /* writes & no data - fall thru */ | |
2483 | } | |
2484 | ||
2485 | /* data no longer needed */ | |
2486 | nvmet_fc_free_tgt_pgs(fod); | |
2487 | ||
2488 | nvmet_fc_xmt_fcp_rsp(tgtport, fod); | |
2489 | } | |
2490 | ||
2491 | ||
2492 | static void | |
2493 | nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req) | |
2494 | { | |
2495 | struct nvmet_fc_fcp_iod *fod = nvmet_req_to_fod(nvme_req); | |
2496 | struct nvmet_fc_tgtport *tgtport = fod->tgtport; | |
2497 | ||
2498 | __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, 0); | |
2499 | } | |
2500 | ||
2501 | ||
2502 | /* | |
ea96d649 | 2503 | * Actual processing routine for received FC-NVME I/O Requests from the LLD |
c5343203 | 2504 | */ |
edba98dd | 2505 | static void |
c5343203 JS |
2506 | nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, |
2507 | struct nvmet_fc_fcp_iod *fod) | |
2508 | { | |
2509 | struct nvme_fc_cmd_iu *cmdiu = &fod->cmdiubuf; | |
cce75291 | 2510 | u32 xfrlen = be32_to_cpu(cmdiu->data_len); |
c5343203 JS |
2511 | int ret; |
2512 | ||
2513 | /* | |
2514 | * Fused commands are currently not supported in the linux | |
2515 | * implementation. | |
2516 | * | |
2517 | * As such, the implementation of the FC transport does not | |
2518 | * look at the fused commands and order delivery to the upper | |
2519 | * layer until we have both based on csn. | |
2520 | */ | |
2521 | ||
2522 | fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done; | |
2523 | ||
c5343203 JS |
2524 | if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) { |
2525 | fod->io_dir = NVMET_FCP_WRITE; | |
2526 | if (!nvme_is_write(&cmdiu->sqe)) | |
2527 | goto transport_error; | |
2528 | } else if (cmdiu->flags & FCNVME_CMD_FLAGS_READ) { | |
2529 | fod->io_dir = NVMET_FCP_READ; | |
2530 | if (nvme_is_write(&cmdiu->sqe)) | |
2531 | goto transport_error; | |
2532 | } else { | |
2533 | fod->io_dir = NVMET_FCP_NODATA; | |
cce75291 | 2534 | if (xfrlen) |
c5343203 JS |
2535 | goto transport_error; |
2536 | } | |
2537 | ||
2538 | fod->req.cmd = &fod->cmdiubuf.sqe; | |
fc6c9730 | 2539 | fod->req.cqe = &fod->rspiubuf.cqe; |
2a4a910a HR |
2540 | if (tgtport->pe) |
2541 | fod->req.port = tgtport->pe->port; | |
c5343203 | 2542 | |
c5343203 JS |
2543 | /* clear any response payload */ |
2544 | memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf)); | |
2545 | ||
188f7e8a JS |
2546 | fod->data_sg = NULL; |
2547 | fod->data_sg_cnt = 0; | |
2548 | ||
c5343203 JS |
2549 | ret = nvmet_req_init(&fod->req, |
2550 | &fod->queue->nvme_cq, | |
2551 | &fod->queue->nvme_sq, | |
2552 | &nvmet_fc_tgt_fcp_ops); | |
188f7e8a JS |
2553 | if (!ret) { |
2554 | /* bad SQE content or invalid ctrl state */ | |
2555 | /* nvmet layer has already called op done to send rsp. */ | |
c5343203 JS |
2556 | return; |
2557 | } | |
2558 | ||
cce75291 JS |
2559 | fod->req.transfer_len = xfrlen; |
2560 | ||
c5343203 JS |
2561 | /* keep a running counter of tail position */ |
2562 | atomic_inc(&fod->queue->sqtail); | |
2563 | ||
5e62d5c9 | 2564 | if (fod->req.transfer_len) { |
c5343203 JS |
2565 | ret = nvmet_fc_alloc_tgt_pgs(fod); |
2566 | if (ret) { | |
2567 | nvmet_req_complete(&fod->req, ret); | |
2568 | return; | |
2569 | } | |
2570 | } | |
2571 | fod->req.sg = fod->data_sg; | |
2572 | fod->req.sg_cnt = fod->data_sg_cnt; | |
2573 | fod->offset = 0; | |
c5343203 JS |
2574 | |
2575 | if (fod->io_dir == NVMET_FCP_WRITE) { | |
2576 | /* pull the data over before invoking nvmet layer */ | |
2577 | nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_WRITEDATA); | |
2578 | return; | |
2579 | } | |
2580 | ||
2581 | /* | |
2582 | * Reads or no data: | |
2583 | * | |
2584 | * can invoke the nvmet_layer now. If read data, cmd completion will | |
2585 | * push the data | |
2586 | */ | |
be3f3114 | 2587 | fod->req.execute(&fod->req); |
c5343203 JS |
2588 | return; |
2589 | ||
2590 | transport_error: | |
a97ec51b | 2591 | nvmet_fc_abort_op(tgtport, fod); |
c5343203 JS |
2592 | } |
2593 | ||
c5343203 JS |
2594 | /** |
2595 | * nvmet_fc_rcv_fcp_req - transport entry point called by an LLDD | |
2596 | * upon the reception of a NVME FCP CMD IU. | |
2597 | * | |
2598 | * Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc | |
2599 | * layer for processing. | |
2600 | * | |
0fb228d3 JS |
2601 | * The nvmet_fc layer allocates a local job structure (struct |
2602 | * nvmet_fc_fcp_iod) from the queue for the io and copies the | |
2603 | * CMD IU buffer to the job structure. As such, on a successful | |
2604 | * completion (returns 0), the LLDD may immediately free/reuse | |
2605 | * the CMD IU buffer passed in the call. | |
2606 | * | |
2607 | * However, in some circumstances, due to the packetized nature of FC | |
2608 | * and the api of the FC LLDD which may issue a hw command to send the | |
2609 | * response, but the LLDD may not get the hw completion for that command | |
2610 | * and upcall the nvmet_fc layer before a new command may be | |
2611 | * asynchronously received - its possible for a command to be received | |
2612 | * before the LLDD and nvmet_fc have recycled the job structure. It gives | |
2613 | * the appearance of more commands received than fits in the sq. | |
2614 | * To alleviate this scenario, a temporary queue is maintained in the | |
2615 | * transport for pending LLDD requests waiting for a queue job structure. | |
2616 | * In these "overrun" cases, a temporary queue element is allocated | |
2617 | * the LLDD request and CMD iu buffer information remembered, and the | |
2618 | * routine returns a -EOVERFLOW status. Subsequently, when a queue job | |
2619 | * structure is freed, it is immediately reallocated for anything on the | |
2620 | * pending request list. The LLDDs defer_rcv() callback is called, | |
2621 | * informing the LLDD that it may reuse the CMD IU buffer, and the io | |
2622 | * is then started normally with the transport. | |
c5343203 | 2623 | * |
0fb228d3 JS |
2624 | * The LLDD, when receiving an -EOVERFLOW completion status, is to treat |
2625 | * the completion as successful but must not reuse the CMD IU buffer | |
2626 | * until the LLDD's defer_rcv() callback has been called for the | |
2627 | * corresponding struct nvmefc_tgt_fcp_req pointer. | |
2628 | * | |
2629 | * If there is any other condition in which an error occurs, the | |
2630 | * transport will return a non-zero status indicating the error. | |
2631 | * In all cases other than -EOVERFLOW, the transport has not accepted the | |
2632 | * request and the LLDD should abort the exchange. | |
c5343203 JS |
2633 | * |
2634 | * @target_port: pointer to the (registered) target port the FCP CMD IU | |
19b58d94 | 2635 | * was received on. |
c5343203 JS |
2636 | * @fcpreq: pointer to a fcpreq request structure to be used to reference |
2637 | * the exchange corresponding to the FCP Exchange. | |
2638 | * @cmdiubuf: pointer to the buffer containing the FCP CMD IU | |
2639 | * @cmdiubuf_len: length, in bytes, of the received FCP CMD IU | |
2640 | */ | |
2641 | int | |
2642 | nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port, | |
2643 | struct nvmefc_tgt_fcp_req *fcpreq, | |
2644 | void *cmdiubuf, u32 cmdiubuf_len) | |
2645 | { | |
2646 | struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port); | |
2647 | struct nvme_fc_cmd_iu *cmdiu = cmdiubuf; | |
2648 | struct nvmet_fc_tgt_queue *queue; | |
2649 | struct nvmet_fc_fcp_iod *fod; | |
0fb228d3 JS |
2650 | struct nvmet_fc_defer_fcp_req *deferfcp; |
2651 | unsigned long flags; | |
c5343203 JS |
2652 | |
2653 | /* validate iu, so the connection id can be used to find the queue */ | |
2654 | if ((cmdiubuf_len != sizeof(*cmdiu)) || | |
53b2b2f5 | 2655 | (cmdiu->format_id != NVME_CMD_FORMAT_ID) || |
c5343203 JS |
2656 | (cmdiu->fc_id != NVME_CMD_FC_ID) || |
2657 | (be16_to_cpu(cmdiu->iu_len) != (sizeof(*cmdiu)/4))) | |
2658 | return -EIO; | |
2659 | ||
c5343203 JS |
2660 | queue = nvmet_fc_find_target_queue(tgtport, |
2661 | be64_to_cpu(cmdiu->connection_id)); | |
2662 | if (!queue) | |
2663 | return -ENOTCONN; | |
2664 | ||
2665 | /* | |
2666 | * note: reference taken by find_target_queue | |
2667 | * After successful fod allocation, the fod will inherit the | |
2668 | * ownership of that reference and will remove the reference | |
2669 | * when the fod is freed. | |
2670 | */ | |
2671 | ||
0fb228d3 JS |
2672 | spin_lock_irqsave(&queue->qlock, flags); |
2673 | ||
c5343203 | 2674 | fod = nvmet_fc_alloc_fcp_iod(queue); |
0fb228d3 JS |
2675 | if (fod) { |
2676 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2677 | ||
2678 | fcpreq->nvmet_fc_private = fod; | |
2679 | fod->fcpreq = fcpreq; | |
2680 | ||
2681 | memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len); | |
2682 | ||
2683 | nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq); | |
2684 | ||
2685 | return 0; | |
2686 | } | |
2687 | ||
2688 | if (!tgtport->ops->defer_rcv) { | |
2689 | spin_unlock_irqrestore(&queue->qlock, flags); | |
c5343203 JS |
2690 | /* release the queue lookup reference */ |
2691 | nvmet_fc_tgt_q_put(queue); | |
2692 | return -ENOENT; | |
2693 | } | |
2694 | ||
0fb228d3 JS |
2695 | deferfcp = list_first_entry_or_null(&queue->avail_defer_list, |
2696 | struct nvmet_fc_defer_fcp_req, req_list); | |
2697 | if (deferfcp) { | |
2698 | /* Just re-use one that was previously allocated */ | |
2699 | list_del(&deferfcp->req_list); | |
2700 | } else { | |
2701 | spin_unlock_irqrestore(&queue->qlock, flags); | |
c5343203 | 2702 | |
0fb228d3 JS |
2703 | /* Now we need to dynamically allocate one */ |
2704 | deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL); | |
2705 | if (!deferfcp) { | |
2706 | /* release the queue lookup reference */ | |
2707 | nvmet_fc_tgt_q_put(queue); | |
2708 | return -ENOMEM; | |
2709 | } | |
2710 | spin_lock_irqsave(&queue->qlock, flags); | |
2711 | } | |
c5343203 | 2712 | |
0fb228d3 JS |
2713 | /* For now, use rspaddr / rsplen to save payload information */ |
2714 | fcpreq->rspaddr = cmdiubuf; | |
2715 | fcpreq->rsplen = cmdiubuf_len; | |
2716 | deferfcp->fcp_req = fcpreq; | |
2717 | ||
2718 | /* defer processing till a fod becomes available */ | |
2719 | list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list); | |
2720 | ||
2721 | /* NOTE: the queue lookup reference is still valid */ | |
2722 | ||
2723 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2724 | ||
2725 | return -EOVERFLOW; | |
c5343203 JS |
2726 | } |
2727 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req); | |
2728 | ||
a97ec51b JS |
2729 | /** |
2730 | * nvmet_fc_rcv_fcp_abort - transport entry point called by an LLDD | |
2731 | * upon the reception of an ABTS for a FCP command | |
2732 | * | |
2733 | * Notify the transport that an ABTS has been received for a FCP command | |
2734 | * that had been given to the transport via nvmet_fc_rcv_fcp_req(). The | |
2735 | * LLDD believes the command is still being worked on | |
2736 | * (template_ops->fcp_req_release() has not been called). | |
2737 | * | |
2738 | * The transport will wait for any outstanding work (an op to the LLDD, | |
2739 | * which the lldd should complete with error due to the ABTS; or the | |
2740 | * completion from the nvmet layer of the nvme command), then will | |
2741 | * stop processing and call the nvmet_fc_rcv_fcp_req() callback to | |
2742 | * return the i/o context to the LLDD. The LLDD may send the BA_ACC | |
2743 | * to the ABTS either after return from this function (assuming any | |
2744 | * outstanding op work has been terminated) or upon the callback being | |
2745 | * called. | |
2746 | * | |
2747 | * @target_port: pointer to the (registered) target port the FCP CMD IU | |
2748 | * was received on. | |
2749 | * @fcpreq: pointer to the fcpreq request structure that corresponds | |
2750 | * to the exchange that received the ABTS. | |
2751 | */ | |
2752 | void | |
2753 | nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port, | |
2754 | struct nvmefc_tgt_fcp_req *fcpreq) | |
2755 | { | |
2756 | struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private; | |
2757 | struct nvmet_fc_tgt_queue *queue; | |
2758 | unsigned long flags; | |
2759 | ||
2760 | if (!fod || fod->fcpreq != fcpreq) | |
2761 | /* job appears to have already completed, ignore abort */ | |
2762 | return; | |
2763 | ||
2764 | queue = fod->queue; | |
2765 | ||
2766 | spin_lock_irqsave(&queue->qlock, flags); | |
2767 | if (fod->active) { | |
2768 | /* | |
2769 | * mark as abort. The abort handler, invoked upon completion | |
2770 | * of any work, will detect the aborted status and do the | |
2771 | * callback. | |
2772 | */ | |
2773 | spin_lock(&fod->flock); | |
2774 | fod->abort = true; | |
2775 | fod->aborted = true; | |
2776 | spin_unlock(&fod->flock); | |
2777 | } | |
2778 | spin_unlock_irqrestore(&queue->qlock, flags); | |
2779 | } | |
2780 | EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort); | |
2781 | ||
c5343203 JS |
2782 | |
2783 | struct nvmet_fc_traddr { | |
2784 | u64 nn; | |
2785 | u64 pn; | |
2786 | }; | |
2787 | ||
c5343203 | 2788 | static int |
9c5358e1 | 2789 | __nvme_fc_parse_u64(substring_t *sstr, u64 *val) |
c5343203 | 2790 | { |
c5343203 JS |
2791 | u64 token64; |
2792 | ||
9c5358e1 JS |
2793 | if (match_u64(sstr, &token64)) |
2794 | return -EINVAL; | |
2795 | *val = token64; | |
c5343203 | 2796 | |
9c5358e1 JS |
2797 | return 0; |
2798 | } | |
c5343203 | 2799 | |
9c5358e1 JS |
2800 | /* |
2801 | * This routine validates and extracts the WWN's from the TRADDR string. | |
2802 | * As kernel parsers need the 0x to determine number base, universally | |
2803 | * build string to parse with 0x prefix before parsing name strings. | |
2804 | */ | |
2805 | static int | |
2806 | nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen) | |
2807 | { | |
2808 | char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1]; | |
2809 | substring_t wwn = { name, &name[sizeof(name)-1] }; | |
2810 | int nnoffset, pnoffset; | |
2811 | ||
d4e4230c | 2812 | /* validate if string is one of the 2 allowed formats */ |
9c5358e1 JS |
2813 | if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH && |
2814 | !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) && | |
2815 | !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET], | |
2816 | "pn-0x", NVME_FC_TRADDR_OXNNLEN)) { | |
2817 | nnoffset = NVME_FC_TRADDR_OXNNLEN; | |
2818 | pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET + | |
2819 | NVME_FC_TRADDR_OXNNLEN; | |
2820 | } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH && | |
2821 | !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) && | |
2822 | !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET], | |
2823 | "pn-", NVME_FC_TRADDR_NNLEN))) { | |
2824 | nnoffset = NVME_FC_TRADDR_NNLEN; | |
2825 | pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN; | |
2826 | } else | |
2827 | goto out_einval; | |
2828 | ||
2829 | name[0] = '0'; | |
2830 | name[1] = 'x'; | |
2831 | name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0; | |
2832 | ||
2833 | memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN); | |
2834 | if (__nvme_fc_parse_u64(&wwn, &traddr->nn)) | |
2835 | goto out_einval; | |
2836 | ||
2837 | memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN); | |
2838 | if (__nvme_fc_parse_u64(&wwn, &traddr->pn)) | |
2839 | goto out_einval; | |
c5343203 | 2840 | |
9c5358e1 JS |
2841 | return 0; |
2842 | ||
2843 | out_einval: | |
2844 | pr_warn("%s: bad traddr string\n", __func__); | |
2845 | return -EINVAL; | |
c5343203 JS |
2846 | } |
2847 | ||
2848 | static int | |
2849 | nvmet_fc_add_port(struct nvmet_port *port) | |
2850 | { | |
2851 | struct nvmet_fc_tgtport *tgtport; | |
ea96d649 | 2852 | struct nvmet_fc_port_entry *pe; |
c5343203 JS |
2853 | struct nvmet_fc_traddr traddr = { 0L, 0L }; |
2854 | unsigned long flags; | |
2855 | int ret; | |
2856 | ||
2857 | /* validate the address info */ | |
2858 | if ((port->disc_addr.trtype != NVMF_TRTYPE_FC) || | |
2859 | (port->disc_addr.adrfam != NVMF_ADDR_FAMILY_FC)) | |
2860 | return -EINVAL; | |
2861 | ||
2862 | /* map the traddr address info to a target port */ | |
2863 | ||
9c5358e1 JS |
2864 | ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr, |
2865 | sizeof(port->disc_addr.traddr)); | |
c5343203 JS |
2866 | if (ret) |
2867 | return ret; | |
2868 | ||
ea96d649 JS |
2869 | pe = kzalloc(sizeof(*pe), GFP_KERNEL); |
2870 | if (!pe) | |
2871 | return -ENOMEM; | |
2872 | ||
c5343203 JS |
2873 | ret = -ENXIO; |
2874 | spin_lock_irqsave(&nvmet_fc_tgtlock, flags); | |
2875 | list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) { | |
2876 | if ((tgtport->fc_target_port.node_name == traddr.nn) && | |
2877 | (tgtport->fc_target_port.port_name == traddr.pn)) { | |
ea96d649 JS |
2878 | /* a FC port can only be 1 nvmet port id */ |
2879 | if (!tgtport->pe) { | |
2880 | nvmet_fc_portentry_bind(tgtport, pe, port); | |
2881 | ret = 0; | |
2882 | } else | |
2883 | ret = -EALREADY; | |
c5343203 JS |
2884 | break; |
2885 | } | |
2886 | } | |
2887 | spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags); | |
ea96d649 JS |
2888 | |
2889 | if (ret) | |
2890 | kfree(pe); | |
2891 | ||
c5343203 JS |
2892 | return ret; |
2893 | } | |
2894 | ||
2895 | static void | |
2896 | nvmet_fc_remove_port(struct nvmet_port *port) | |
2897 | { | |
ea96d649 JS |
2898 | struct nvmet_fc_port_entry *pe = port->priv; |
2899 | ||
2900 | nvmet_fc_portentry_unbind(pe); | |
2901 | ||
2902 | kfree(pe); | |
c5343203 JS |
2903 | } |
2904 | ||
150d71f7 JS |
2905 | static void |
2906 | nvmet_fc_discovery_chg(struct nvmet_port *port) | |
2907 | { | |
2908 | struct nvmet_fc_port_entry *pe = port->priv; | |
2909 | struct nvmet_fc_tgtport *tgtport = pe->tgtport; | |
2910 | ||
2911 | if (tgtport && tgtport->ops->discovery_event) | |
2912 | tgtport->ops->discovery_event(&tgtport->fc_target_port); | |
2913 | } | |
2914 | ||
e929f06d | 2915 | static const struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = { |
c5343203 JS |
2916 | .owner = THIS_MODULE, |
2917 | .type = NVMF_TRTYPE_FC, | |
2918 | .msdbd = 1, | |
2919 | .add_port = nvmet_fc_add_port, | |
2920 | .remove_port = nvmet_fc_remove_port, | |
2921 | .queue_response = nvmet_fc_fcp_nvme_cmd_done, | |
2922 | .delete_ctrl = nvmet_fc_delete_ctrl, | |
150d71f7 | 2923 | .discovery_chg = nvmet_fc_discovery_chg, |
c5343203 JS |
2924 | }; |
2925 | ||
2926 | static int __init nvmet_fc_init_module(void) | |
2927 | { | |
2928 | return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops); | |
2929 | } | |
2930 | ||
2931 | static void __exit nvmet_fc_exit_module(void) | |
2932 | { | |
2933 | /* sanity check - all lports should be removed */ | |
2934 | if (!list_empty(&nvmet_fc_target_list)) | |
2935 | pr_warn("%s: targetport list not empty\n", __func__); | |
2936 | ||
2937 | nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops); | |
2938 | ||
2939 | ida_destroy(&nvmet_fc_tgtport_cnt); | |
2940 | } | |
2941 | ||
2942 | module_init(nvmet_fc_init_module); | |
2943 | module_exit(nvmet_fc_exit_module); | |
2944 | ||
2945 | MODULE_LICENSE("GPL v2"); |