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33#include <linux/module.h>
34#include <linux/kernel.h>
35#include <linux/slab.h>
36#include <linux/mm.h>
37#include <linux/highmem.h>
38#include <linux/scatterlist.h>
39
40#include "iscsi_iser.h"
41static
42int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
43 struct iser_data_buf *mem,
44 struct iser_reg_resources *rsc,
45 struct iser_mem_reg *mem_reg);
46static
47int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
48 struct iser_data_buf *mem,
49 struct iser_reg_resources *rsc,
50 struct iser_mem_reg *mem_reg);
51
52static const struct iser_reg_ops fastreg_ops = {
53 .alloc_reg_res = iser_alloc_fastreg_pool,
54 .free_reg_res = iser_free_fastreg_pool,
55 .reg_mem = iser_fast_reg_mr,
56 .unreg_mem = iser_unreg_mem_fastreg,
57 .reg_desc_get = iser_reg_desc_get_fr,
58 .reg_desc_put = iser_reg_desc_put_fr,
59};
60
61static const struct iser_reg_ops fmr_ops = {
62 .alloc_reg_res = iser_alloc_fmr_pool,
63 .free_reg_res = iser_free_fmr_pool,
64 .reg_mem = iser_fast_reg_fmr,
65 .unreg_mem = iser_unreg_mem_fmr,
66 .reg_desc_get = iser_reg_desc_get_fmr,
67 .reg_desc_put = iser_reg_desc_put_fmr,
68};
69
70void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc)
71{
72 iser_err_comp(wc, "memreg");
73}
74
75int iser_assign_reg_ops(struct iser_device *device)
76{
77 struct ib_device *ib_dev = device->ib_device;
78
79
80 if (ib_dev->ops.alloc_fmr && ib_dev->ops.dealloc_fmr &&
81 ib_dev->ops.map_phys_fmr && ib_dev->ops.unmap_fmr) {
82 iser_info("FMR supported, using FMR for registration\n");
83 device->reg_ops = &fmr_ops;
84 } else if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
85 iser_info("FastReg supported, using FastReg for registration\n");
86 device->reg_ops = &fastreg_ops;
87 device->remote_inv_sup = iser_always_reg;
88 } else {
89 iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
90 return -1;
91 }
92
93 return 0;
94}
95
96struct iser_fr_desc *
97iser_reg_desc_get_fr(struct ib_conn *ib_conn)
98{
99 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
100 struct iser_fr_desc *desc;
101 unsigned long flags;
102
103 spin_lock_irqsave(&fr_pool->lock, flags);
104 desc = list_first_entry(&fr_pool->list,
105 struct iser_fr_desc, list);
106 list_del(&desc->list);
107 spin_unlock_irqrestore(&fr_pool->lock, flags);
108
109 return desc;
110}
111
112void
113iser_reg_desc_put_fr(struct ib_conn *ib_conn,
114 struct iser_fr_desc *desc)
115{
116 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
117 unsigned long flags;
118
119 spin_lock_irqsave(&fr_pool->lock, flags);
120 list_add(&desc->list, &fr_pool->list);
121 spin_unlock_irqrestore(&fr_pool->lock, flags);
122}
123
124struct iser_fr_desc *
125iser_reg_desc_get_fmr(struct ib_conn *ib_conn)
126{
127 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
128
129 return list_first_entry(&fr_pool->list,
130 struct iser_fr_desc, list);
131}
132
133void
134iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
135 struct iser_fr_desc *desc)
136{
137}
138
139static void iser_data_buf_dump(struct iser_data_buf *data,
140 struct ib_device *ibdev)
141{
142 struct scatterlist *sg;
143 int i;
144
145 for_each_sg(data->sg, sg, data->dma_nents, i)
146 iser_dbg("sg[%d] dma_addr:0x%lX page:0x%p "
147 "off:0x%x sz:0x%x dma_len:0x%x\n",
148 i, (unsigned long)sg_dma_address(sg),
149 sg_page(sg), sg->offset, sg->length, sg_dma_len(sg));
150}
151
152static void iser_dump_page_vec(struct iser_page_vec *page_vec)
153{
154 int i;
155
156 iser_err("page vec npages %d data length %lld\n",
157 page_vec->npages, page_vec->fake_mr.length);
158 for (i = 0; i < page_vec->npages; i++)
159 iser_err("vec[%d]: %llx\n", i, page_vec->pages[i]);
160}
161
162int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
163 struct iser_data_buf *data,
164 enum iser_data_dir iser_dir,
165 enum dma_data_direction dma_dir)
166{
167 struct ib_device *dev;
168
169 iser_task->dir[iser_dir] = 1;
170 dev = iser_task->iser_conn->ib_conn.device->ib_device;
171
172 data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
173 if (data->dma_nents == 0) {
174 iser_err("dma_map_sg failed!!!\n");
175 return -EINVAL;
176 }
177 return 0;
178}
179
180void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
181 struct iser_data_buf *data,
182 enum dma_data_direction dir)
183{
184 struct ib_device *dev;
185
186 dev = iser_task->iser_conn->ib_conn.device->ib_device;
187 ib_dma_unmap_sg(dev, data->sg, data->size, dir);
188}
189
190static int
191iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
192 struct iser_mem_reg *reg)
193{
194 struct scatterlist *sg = mem->sg;
195
196 reg->sge.lkey = device->pd->local_dma_lkey;
197
198
199
200
201
202 if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
203 reg->rkey = device->pd->unsafe_global_rkey;
204 else
205 reg->rkey = 0;
206 reg->sge.addr = sg_dma_address(&sg[0]);
207 reg->sge.length = sg_dma_len(&sg[0]);
208
209 iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
210 " length=0x%x\n", reg->sge.lkey, reg->rkey,
211 reg->sge.addr, reg->sge.length);
212
213 return 0;
214}
215
216static int iser_set_page(struct ib_mr *mr, u64 addr)
217{
218 struct iser_page_vec *page_vec =
219 container_of(mr, struct iser_page_vec, fake_mr);
220
221 page_vec->pages[page_vec->npages++] = addr;
222
223 return 0;
224}
225
226static
227int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
228 struct iser_data_buf *mem,
229 struct iser_reg_resources *rsc,
230 struct iser_mem_reg *reg)
231{
232 struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
233 struct iser_device *device = ib_conn->device;
234 struct iser_page_vec *page_vec = rsc->page_vec;
235 struct ib_fmr_pool *fmr_pool = rsc->fmr_pool;
236 struct ib_pool_fmr *fmr;
237 int ret, plen;
238
239 page_vec->npages = 0;
240 page_vec->fake_mr.page_size = SIZE_4K;
241 plen = ib_sg_to_pages(&page_vec->fake_mr, mem->sg,
242 mem->dma_nents, NULL, iser_set_page);
243 if (unlikely(plen < mem->dma_nents)) {
244 iser_err("page vec too short to hold this SG\n");
245 iser_data_buf_dump(mem, device->ib_device);
246 iser_dump_page_vec(page_vec);
247 return -EINVAL;
248 }
249
250 fmr = ib_fmr_pool_map_phys(fmr_pool, page_vec->pages,
251 page_vec->npages, page_vec->pages[0]);
252 if (IS_ERR(fmr)) {
253 ret = PTR_ERR(fmr);
254 iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
255 return ret;
256 }
257
258 reg->sge.lkey = fmr->fmr->lkey;
259 reg->rkey = fmr->fmr->rkey;
260 reg->sge.addr = page_vec->fake_mr.iova;
261 reg->sge.length = page_vec->fake_mr.length;
262 reg->mem_h = fmr;
263
264 iser_dbg("fmr reg: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
265 " length=0x%x\n", reg->sge.lkey, reg->rkey,
266 reg->sge.addr, reg->sge.length);
267
268 return 0;
269}
270
271
272
273
274
275void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
276 enum iser_data_dir cmd_dir)
277{
278 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
279
280 if (!reg->mem_h)
281 return;
282
283 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);
284
285 ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
286
287 reg->mem_h = NULL;
288}
289
290void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
291 enum iser_data_dir cmd_dir)
292{
293 struct iser_device *device = iser_task->iser_conn->ib_conn.device;
294 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
295
296 if (!reg->mem_h)
297 return;
298
299 device->reg_ops->reg_desc_put(&iser_task->iser_conn->ib_conn,
300 reg->mem_h);
301 reg->mem_h = NULL;
302}
303
304static void
305iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_domain *domain)
306{
307 domain->sig_type = IB_SIG_TYPE_T10_DIF;
308 domain->sig.dif.pi_interval = scsi_prot_interval(sc);
309 domain->sig.dif.ref_tag = t10_pi_ref_tag(sc->request);
310
311
312
313
314 domain->sig.dif.apptag_check_mask = 0xffff;
315 domain->sig.dif.app_escape = true;
316 domain->sig.dif.ref_escape = true;
317 if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
318 domain->sig.dif.ref_remap = true;
319};
320
321static int
322iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
323{
324 switch (scsi_get_prot_op(sc)) {
325 case SCSI_PROT_WRITE_INSERT:
326 case SCSI_PROT_READ_STRIP:
327 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
328 iser_set_dif_domain(sc, &sig_attrs->wire);
329 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
330 break;
331 case SCSI_PROT_READ_INSERT:
332 case SCSI_PROT_WRITE_STRIP:
333 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
334 iser_set_dif_domain(sc, &sig_attrs->mem);
335 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
336 IB_T10DIF_CSUM : IB_T10DIF_CRC;
337 break;
338 case SCSI_PROT_READ_PASS:
339 case SCSI_PROT_WRITE_PASS:
340 iser_set_dif_domain(sc, &sig_attrs->wire);
341 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
342 iser_set_dif_domain(sc, &sig_attrs->mem);
343 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
344 IB_T10DIF_CSUM : IB_T10DIF_CRC;
345 break;
346 default:
347 iser_err("Unsupported PI operation %d\n",
348 scsi_get_prot_op(sc));
349 return -EINVAL;
350 }
351
352 return 0;
353}
354
355static inline void
356iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
357{
358 *mask = 0;
359 if (sc->prot_flags & SCSI_PROT_REF_CHECK)
360 *mask |= IB_SIG_CHECK_REFTAG;
361 if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
362 *mask |= IB_SIG_CHECK_GUARD;
363}
364
365static inline void
366iser_inv_rkey(struct ib_send_wr *inv_wr,
367 struct ib_mr *mr,
368 struct ib_cqe *cqe,
369 struct ib_send_wr *next_wr)
370{
371 inv_wr->opcode = IB_WR_LOCAL_INV;
372 inv_wr->wr_cqe = cqe;
373 inv_wr->ex.invalidate_rkey = mr->rkey;
374 inv_wr->send_flags = 0;
375 inv_wr->num_sge = 0;
376 inv_wr->next = next_wr;
377}
378
379static int
380iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
381 struct iser_data_buf *mem,
382 struct iser_data_buf *sig_mem,
383 struct iser_reg_resources *rsc,
384 struct iser_mem_reg *sig_reg)
385{
386 struct iser_tx_desc *tx_desc = &iser_task->desc;
387 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
388 struct ib_mr *mr = rsc->sig_mr;
389 struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
390 struct ib_reg_wr *wr = &tx_desc->reg_wr;
391 int ret;
392
393 memset(sig_attrs, 0, sizeof(*sig_attrs));
394 ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
395 if (ret)
396 goto err;
397
398 iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
399
400 if (rsc->mr_valid)
401 iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
402
403 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
404
405 ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL,
406 sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K);
407 if (unlikely(ret)) {
408 iser_err("failed to map PI sg (%d)\n",
409 mem->dma_nents + sig_mem->dma_nents);
410 goto err;
411 }
412
413 memset(wr, 0, sizeof(*wr));
414 wr->wr.next = &tx_desc->send_wr;
415 wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
416 wr->wr.wr_cqe = cqe;
417 wr->wr.num_sge = 0;
418 wr->wr.send_flags = 0;
419 wr->mr = mr;
420 wr->key = mr->rkey;
421 wr->access = IB_ACCESS_LOCAL_WRITE |
422 IB_ACCESS_REMOTE_READ |
423 IB_ACCESS_REMOTE_WRITE;
424 rsc->mr_valid = 1;
425
426 sig_reg->sge.lkey = mr->lkey;
427 sig_reg->rkey = mr->rkey;
428 sig_reg->sge.addr = mr->iova;
429 sig_reg->sge.length = mr->length;
430
431 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
432 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
433 sig_reg->sge.length);
434err:
435 return ret;
436}
437
438static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
439 struct iser_data_buf *mem,
440 struct iser_reg_resources *rsc,
441 struct iser_mem_reg *reg)
442{
443 struct iser_tx_desc *tx_desc = &iser_task->desc;
444 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
445 struct ib_mr *mr = rsc->mr;
446 struct ib_reg_wr *wr = &tx_desc->reg_wr;
447 int n;
448
449 if (rsc->mr_valid)
450 iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
451
452 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
453
454 n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SIZE_4K);
455 if (unlikely(n != mem->dma_nents)) {
456 iser_err("failed to map sg (%d/%d)\n",
457 n, mem->dma_nents);
458 return n < 0 ? n : -EINVAL;
459 }
460
461 wr->wr.next = &tx_desc->send_wr;
462 wr->wr.opcode = IB_WR_REG_MR;
463 wr->wr.wr_cqe = cqe;
464 wr->wr.send_flags = 0;
465 wr->wr.num_sge = 0;
466 wr->mr = mr;
467 wr->key = mr->rkey;
468 wr->access = IB_ACCESS_LOCAL_WRITE |
469 IB_ACCESS_REMOTE_WRITE |
470 IB_ACCESS_REMOTE_READ;
471
472 rsc->mr_valid = 1;
473
474 reg->sge.lkey = mr->lkey;
475 reg->rkey = mr->rkey;
476 reg->sge.addr = mr->iova;
477 reg->sge.length = mr->length;
478
479 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
480 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
481
482 return 0;
483}
484
485static int
486iser_reg_data_sg(struct iscsi_iser_task *task,
487 struct iser_data_buf *mem,
488 struct iser_fr_desc *desc,
489 bool use_dma_key,
490 struct iser_mem_reg *reg)
491{
492 struct iser_device *device = task->iser_conn->ib_conn.device;
493
494 if (use_dma_key)
495 return iser_reg_dma(device, mem, reg);
496
497 return device->reg_ops->reg_mem(task, mem, &desc->rsc, reg);
498}
499
500int iser_reg_rdma_mem(struct iscsi_iser_task *task,
501 enum iser_data_dir dir,
502 bool all_imm)
503{
504 struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
505 struct iser_device *device = ib_conn->device;
506 struct iser_data_buf *mem = &task->data[dir];
507 struct iser_mem_reg *reg = &task->rdma_reg[dir];
508 struct iser_fr_desc *desc = NULL;
509 bool use_dma_key;
510 int err;
511
512 use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
513 scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
514
515 if (!use_dma_key) {
516 desc = device->reg_ops->reg_desc_get(ib_conn);
517 reg->mem_h = desc;
518 }
519
520 if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) {
521 err = iser_reg_data_sg(task, mem, desc, use_dma_key, reg);
522 if (unlikely(err))
523 goto err_reg;
524 } else {
525 err = iser_reg_sig_mr(task, mem, &task->prot[dir],
526 &desc->rsc, reg);
527 if (unlikely(err))
528 goto err_reg;
529
530 desc->sig_protected = 1;
531 }
532
533 return 0;
534
535err_reg:
536 if (desc)
537 device->reg_ops->reg_desc_put(ib_conn, desc);
538
539 return err;
540}
541
542void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
543 enum iser_data_dir dir)
544{
545 struct iser_device *device = task->iser_conn->ib_conn.device;
546
547 device->reg_ops->unreg_mem(task, dir);
548}
549
