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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->alloc_fmr && ib_dev->dealloc_fmr &&
81 ib_dev->map_phys_fmr && ib_dev->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)ib_sg_dma_address(ibdev, sg),
149 sg_page(sg), sg->offset,
150 sg->length, ib_sg_dma_len(ibdev, sg));
151}
152
153static void iser_dump_page_vec(struct iser_page_vec *page_vec)
154{
155 int i;
156
157 iser_err("page vec npages %d data length %lld\n",
158 page_vec->npages, page_vec->fake_mr.length);
159 for (i = 0; i < page_vec->npages; i++)
160 iser_err("vec[%d]: %llx\n", i, page_vec->pages[i]);
161}
162
163int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
164 struct iser_data_buf *data,
165 enum iser_data_dir iser_dir,
166 enum dma_data_direction dma_dir)
167{
168 struct ib_device *dev;
169
170 iser_task->dir[iser_dir] = 1;
171 dev = iser_task->iser_conn->ib_conn.device->ib_device;
172
173 data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir);
174 if (data->dma_nents == 0) {
175 iser_err("dma_map_sg failed!!!\n");
176 return -EINVAL;
177 }
178 return 0;
179}
180
181void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
182 struct iser_data_buf *data,
183 enum dma_data_direction dir)
184{
185 struct ib_device *dev;
186
187 dev = iser_task->iser_conn->ib_conn.device->ib_device;
188 ib_dma_unmap_sg(dev, data->sg, data->size, dir);
189}
190
191static int
192iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem,
193 struct iser_mem_reg *reg)
194{
195 struct scatterlist *sg = mem->sg;
196
197 reg->sge.lkey = device->pd->local_dma_lkey;
198
199
200
201
202
203 if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
204 reg->rkey = device->pd->unsafe_global_rkey;
205 else
206 reg->rkey = 0;
207 reg->sge.addr = ib_sg_dma_address(device->ib_device, &sg[0]);
208 reg->sge.length = ib_sg_dma_len(device->ib_device, &sg[0]);
209
210 iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
211 " length=0x%x\n", reg->sge.lkey, reg->rkey,
212 reg->sge.addr, reg->sge.length);
213
214 return 0;
215}
216
217static int iser_set_page(struct ib_mr *mr, u64 addr)
218{
219 struct iser_page_vec *page_vec =
220 container_of(mr, struct iser_page_vec, fake_mr);
221
222 page_vec->pages[page_vec->npages++] = addr;
223
224 return 0;
225}
226
227static
228int iser_fast_reg_fmr(struct iscsi_iser_task *iser_task,
229 struct iser_data_buf *mem,
230 struct iser_reg_resources *rsc,
231 struct iser_mem_reg *reg)
232{
233 struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
234 struct iser_device *device = ib_conn->device;
235 struct iser_page_vec *page_vec = rsc->page_vec;
236 struct ib_fmr_pool *fmr_pool = rsc->fmr_pool;
237 struct ib_pool_fmr *fmr;
238 int ret, plen;
239
240 page_vec->npages = 0;
241 page_vec->fake_mr.page_size = SIZE_4K;
242 plen = ib_sg_to_pages(&page_vec->fake_mr, mem->sg,
243 mem->size, NULL, iser_set_page);
244 if (unlikely(plen < mem->size)) {
245 iser_err("page vec too short to hold this SG\n");
246 iser_data_buf_dump(mem, device->ib_device);
247 iser_dump_page_vec(page_vec);
248 return -EINVAL;
249 }
250
251 fmr = ib_fmr_pool_map_phys(fmr_pool, page_vec->pages,
252 page_vec->npages, page_vec->pages[0]);
253 if (IS_ERR(fmr)) {
254 ret = PTR_ERR(fmr);
255 iser_err("ib_fmr_pool_map_phys failed: %d\n", ret);
256 return ret;
257 }
258
259 reg->sge.lkey = fmr->fmr->lkey;
260 reg->rkey = fmr->fmr->rkey;
261 reg->sge.addr = page_vec->fake_mr.iova;
262 reg->sge.length = page_vec->fake_mr.length;
263 reg->mem_h = fmr;
264
265 iser_dbg("fmr reg: lkey=0x%x, rkey=0x%x, addr=0x%llx,"
266 " length=0x%x\n", reg->sge.lkey, reg->rkey,
267 reg->sge.addr, reg->sge.length);
268
269 return 0;
270}
271
272
273
274
275
276void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
277 enum iser_data_dir cmd_dir)
278{
279 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
280 int ret;
281
282 if (!reg->mem_h)
283 return;
284
285 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n", reg->mem_h);
286
287 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
288 if (ret)
289 iser_err("ib_fmr_pool_unmap failed %d\n", ret);
290
291 reg->mem_h = NULL;
292}
293
294void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
295 enum iser_data_dir cmd_dir)
296{
297 struct iser_device *device = iser_task->iser_conn->ib_conn.device;
298 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
299
300 if (!reg->mem_h)
301 return;
302
303 device->reg_ops->reg_desc_put(&iser_task->iser_conn->ib_conn,
304 reg->mem_h);
305 reg->mem_h = NULL;
306}
307
308static void
309iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs,
310 struct ib_sig_domain *domain)
311{
312 domain->sig_type = IB_SIG_TYPE_T10_DIF;
313 domain->sig.dif.pi_interval = scsi_prot_interval(sc);
314 domain->sig.dif.ref_tag = scsi_prot_ref_tag(sc);
315
316
317
318
319 domain->sig.dif.apptag_check_mask = 0xffff;
320 domain->sig.dif.app_escape = true;
321 domain->sig.dif.ref_escape = true;
322 if (sc->prot_flags & SCSI_PROT_REF_INCREMENT)
323 domain->sig.dif.ref_remap = true;
324};
325
326static int
327iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs)
328{
329 switch (scsi_get_prot_op(sc)) {
330 case SCSI_PROT_WRITE_INSERT:
331 case SCSI_PROT_READ_STRIP:
332 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
333 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
334 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
335 break;
336 case SCSI_PROT_READ_INSERT:
337 case SCSI_PROT_WRITE_STRIP:
338 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
339 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
340 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
341 IB_T10DIF_CSUM : IB_T10DIF_CRC;
342 break;
343 case SCSI_PROT_READ_PASS:
344 case SCSI_PROT_WRITE_PASS:
345 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->wire);
346 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
347 iser_set_dif_domain(sc, sig_attrs, &sig_attrs->mem);
348 sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ?
349 IB_T10DIF_CSUM : IB_T10DIF_CRC;
350 break;
351 default:
352 iser_err("Unsupported PI operation %d\n",
353 scsi_get_prot_op(sc));
354 return -EINVAL;
355 }
356
357 return 0;
358}
359
360static inline void
361iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask)
362{
363 *mask = 0;
364 if (sc->prot_flags & SCSI_PROT_REF_CHECK)
365 *mask |= IB_SIG_CHECK_REFTAG;
366 if (sc->prot_flags & SCSI_PROT_GUARD_CHECK)
367 *mask |= IB_SIG_CHECK_GUARD;
368}
369
370static inline void
371iser_inv_rkey(struct ib_send_wr *inv_wr,
372 struct ib_mr *mr,
373 struct ib_cqe *cqe)
374{
375 inv_wr->opcode = IB_WR_LOCAL_INV;
376 inv_wr->wr_cqe = cqe;
377 inv_wr->ex.invalidate_rkey = mr->rkey;
378 inv_wr->send_flags = 0;
379 inv_wr->num_sge = 0;
380}
381
382static int
383iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
384 struct iser_pi_context *pi_ctx,
385 struct iser_mem_reg *data_reg,
386 struct iser_mem_reg *prot_reg,
387 struct iser_mem_reg *sig_reg)
388{
389 struct iser_tx_desc *tx_desc = &iser_task->desc;
390 struct ib_sig_attrs *sig_attrs = &tx_desc->sig_attrs;
391 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
392 struct ib_sig_handover_wr *wr;
393 struct ib_mr *mr = pi_ctx->sig_mr;
394 int ret;
395
396 memset(sig_attrs, 0, sizeof(*sig_attrs));
397 ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
398 if (ret)
399 goto err;
400
401 iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
402
403 if (pi_ctx->sig_mr_valid)
404 iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
405
406 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
407
408 wr = sig_handover_wr(iser_tx_next_wr(tx_desc));
409 wr->wr.opcode = IB_WR_REG_SIG_MR;
410 wr->wr.wr_cqe = cqe;
411 wr->wr.sg_list = &data_reg->sge;
412 wr->wr.num_sge = 1;
413 wr->wr.send_flags = 0;
414 wr->sig_attrs = sig_attrs;
415 wr->sig_mr = mr;
416 if (scsi_prot_sg_count(iser_task->sc))
417 wr->prot = &prot_reg->sge;
418 else
419 wr->prot = NULL;
420 wr->access_flags = IB_ACCESS_LOCAL_WRITE |
421 IB_ACCESS_REMOTE_READ |
422 IB_ACCESS_REMOTE_WRITE;
423 pi_ctx->sig_mr_valid = 1;
424
425 sig_reg->sge.lkey = mr->lkey;
426 sig_reg->rkey = mr->rkey;
427 sig_reg->sge.addr = 0;
428 sig_reg->sge.length = scsi_transfer_length(iser_task->sc);
429
430 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n",
431 sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr,
432 sig_reg->sge.length);
433err:
434 return ret;
435}
436
437static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
438 struct iser_data_buf *mem,
439 struct iser_reg_resources *rsc,
440 struct iser_mem_reg *reg)
441{
442 struct iser_tx_desc *tx_desc = &iser_task->desc;
443 struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
444 struct ib_mr *mr = rsc->mr;
445 struct ib_reg_wr *wr;
446 int n;
447
448 if (rsc->mr_valid)
449 iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
450
451 ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
452
453 n = ib_map_mr_sg(mr, mem->sg, mem->size, NULL, SIZE_4K);
454 if (unlikely(n != mem->size)) {
455 iser_err("failed to map sg (%d/%d)\n",
456 n, mem->size);
457 return n < 0 ? n : -EINVAL;
458 }
459
460 wr = reg_wr(iser_tx_next_wr(tx_desc));
461 wr->wr.opcode = IB_WR_REG_MR;
462 wr->wr.wr_cqe = cqe;
463 wr->wr.send_flags = 0;
464 wr->wr.num_sge = 0;
465 wr->mr = mr;
466 wr->key = mr->rkey;
467 wr->access = IB_ACCESS_LOCAL_WRITE |
468 IB_ACCESS_REMOTE_WRITE |
469 IB_ACCESS_REMOTE_READ;
470
471 rsc->mr_valid = 1;
472
473 reg->sge.lkey = mr->lkey;
474 reg->rkey = mr->rkey;
475 reg->sge.addr = mr->iova;
476 reg->sge.length = mr->length;
477
478 iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n",
479 reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length);
480
481 return 0;
482}
483
484static int
485iser_reg_prot_sg(struct iscsi_iser_task *task,
486 struct iser_data_buf *mem,
487 struct iser_fr_desc *desc,
488 bool use_dma_key,
489 struct iser_mem_reg *reg)
490{
491 struct iser_device *device = task->iser_conn->ib_conn.device;
492
493 if (use_dma_key)
494 return iser_reg_dma(device, mem, reg);
495
496 return device->reg_ops->reg_mem(task, mem, &desc->pi_ctx->rsc, reg);
497}
498
499static int
500iser_reg_data_sg(struct iscsi_iser_task *task,
501 struct iser_data_buf *mem,
502 struct iser_fr_desc *desc,
503 bool use_dma_key,
504 struct iser_mem_reg *reg)
505{
506 struct iser_device *device = task->iser_conn->ib_conn.device;
507
508 if (use_dma_key)
509 return iser_reg_dma(device, mem, reg);
510
511 return device->reg_ops->reg_mem(task, mem, &desc->rsc, reg);
512}
513
514int iser_reg_rdma_mem(struct iscsi_iser_task *task,
515 enum iser_data_dir dir,
516 bool all_imm)
517{
518 struct ib_conn *ib_conn = &task->iser_conn->ib_conn;
519 struct iser_device *device = ib_conn->device;
520 struct iser_data_buf *mem = &task->data[dir];
521 struct iser_mem_reg *reg = &task->rdma_reg[dir];
522 struct iser_mem_reg *data_reg;
523 struct iser_fr_desc *desc = NULL;
524 bool use_dma_key;
525 int err;
526
527 use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) &&
528 scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL;
529
530 if (!use_dma_key) {
531 desc = device->reg_ops->reg_desc_get(ib_conn);
532 reg->mem_h = desc;
533 }
534
535 if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL)
536 data_reg = reg;
537 else
538 data_reg = &task->desc.data_reg;
539
540 err = iser_reg_data_sg(task, mem, desc, use_dma_key, data_reg);
541 if (unlikely(err))
542 goto err_reg;
543
544 if (scsi_get_prot_op(task->sc) != SCSI_PROT_NORMAL) {
545 struct iser_mem_reg *prot_reg = &task->desc.prot_reg;
546
547 if (scsi_prot_sg_count(task->sc)) {
548 mem = &task->prot[dir];
549 err = iser_reg_prot_sg(task, mem, desc,
550 use_dma_key, prot_reg);
551 if (unlikely(err))
552 goto err_reg;
553 }
554
555 err = iser_reg_sig_mr(task, desc->pi_ctx, data_reg,
556 prot_reg, reg);
557 if (unlikely(err))
558 goto err_reg;
559
560 desc->pi_ctx->sig_protected = 1;
561 }
562
563 return 0;
564
565err_reg:
566 if (desc)
567 device->reg_ops->reg_desc_put(ib_conn, desc);
568
569 return err;
570}
571
572void iser_unreg_rdma_mem(struct iscsi_iser_task *task,
573 enum iser_data_dir dir)
574{
575 struct iser_device *device = task->iser_conn->ib_conn.device;
576
577 device->reg_ops->unreg_mem(task, dir);
578}
579
