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43#include <linux/sunrpc/debug.h>
44#include <linux/sunrpc/rpc_rdma.h>
45#include <linux/spinlock.h>
46#include <asm/unaligned.h>
47#include <rdma/ib_verbs.h>
48#include <rdma/rdma_cm.h>
49#include <linux/sunrpc/svc_rdma.h>
50
51#define RPCDBG_FACILITY RPCDBG_SVCXPRT
52
53
54
55
56
57
58static void rdma_build_arg_xdr(struct svc_rqst *rqstp,
59 struct svc_rdma_op_ctxt *ctxt,
60 u32 byte_count)
61{
62 struct rpcrdma_msg *rmsgp;
63 struct page *page;
64 u32 bc;
65 int sge_no;
66
67
68 page = ctxt->pages[0];
69 put_page(rqstp->rq_pages[0]);
70 rqstp->rq_pages[0] = page;
71
72
73 rqstp->rq_arg.head[0].iov_base = page_address(page);
74 rqstp->rq_arg.head[0].iov_len =
75 min_t(size_t, byte_count, ctxt->sge[0].length);
76 rqstp->rq_arg.len = byte_count;
77 rqstp->rq_arg.buflen = byte_count;
78
79
80 bc = byte_count - rqstp->rq_arg.head[0].iov_len;
81
82
83 rqstp->rq_arg.page_len = bc;
84 rqstp->rq_arg.page_base = 0;
85
86
87 rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base;
88 if (be32_to_cpu(rmsgp->rm_type) == RDMA_NOMSG)
89 rqstp->rq_arg.pages = &rqstp->rq_pages[0];
90 else
91 rqstp->rq_arg.pages = &rqstp->rq_pages[1];
92
93 sge_no = 1;
94 while (bc && sge_no < ctxt->count) {
95 page = ctxt->pages[sge_no];
96 put_page(rqstp->rq_pages[sge_no]);
97 rqstp->rq_pages[sge_no] = page;
98 bc -= min_t(u32, bc, ctxt->sge[sge_no].length);
99 rqstp->rq_arg.buflen += ctxt->sge[sge_no].length;
100 sge_no++;
101 }
102 rqstp->rq_respages = &rqstp->rq_pages[sge_no];
103 rqstp->rq_next_page = rqstp->rq_respages + 1;
104
105
106 bc = sge_no;
107 while (sge_no < ctxt->count) {
108 page = ctxt->pages[sge_no++];
109 put_page(page);
110 }
111 ctxt->count = bc;
112
113
114 rqstp->rq_arg.tail[0].iov_base = NULL;
115 rqstp->rq_arg.tail[0].iov_len = 0;
116}
117
118static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count)
119{
120 if (rdma_node_get_transport(xprt->sc_cm_id->device->node_type) ==
121 RDMA_TRANSPORT_IWARP)
122 return 1;
123 else
124 return min_t(int, sge_count, xprt->sc_max_sge);
125}
126
127
128int rdma_read_chunk_lcl(struct svcxprt_rdma *xprt,
129 struct svc_rqst *rqstp,
130 struct svc_rdma_op_ctxt *head,
131 int *page_no,
132 u32 *page_offset,
133 u32 rs_handle,
134 u32 rs_length,
135 u64 rs_offset,
136 bool last)
137{
138 struct ib_send_wr read_wr;
139 int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
140 struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
141 int ret, read, pno;
142 u32 pg_off = *page_offset;
143 u32 pg_no = *page_no;
144
145 ctxt->direction = DMA_FROM_DEVICE;
146 ctxt->read_hdr = head;
147 pages_needed =
148 min_t(int, pages_needed, rdma_read_max_sge(xprt, pages_needed));
149 read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
150
151 for (pno = 0; pno < pages_needed; pno++) {
152 int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
153
154 head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
155 head->arg.page_len += len;
156 head->arg.len += len;
157 if (!pg_off)
158 head->count++;
159 rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
160 rqstp->rq_next_page = rqstp->rq_respages + 1;
161 ctxt->sge[pno].addr =
162 ib_dma_map_page(xprt->sc_cm_id->device,
163 head->arg.pages[pg_no], pg_off,
164 PAGE_SIZE - pg_off,
165 DMA_FROM_DEVICE);
166 ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
167 ctxt->sge[pno].addr);
168 if (ret)
169 goto err;
170 atomic_inc(&xprt->sc_dma_used);
171
172
173 ctxt->sge[pno].lkey = xprt->sc_dma_lkey;
174 ctxt->sge[pno].length = len;
175 ctxt->count++;
176
177
178 pg_off += len;
179 if (pg_off == PAGE_SIZE) {
180 pg_off = 0;
181 pg_no++;
182 }
183 rs_length -= len;
184 }
185
186 if (last && rs_length == 0)
187 set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
188 else
189 clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
190
191 memset(&read_wr, 0, sizeof(read_wr));
192 read_wr.wr_id = (unsigned long)ctxt;
193 read_wr.opcode = IB_WR_RDMA_READ;
194 ctxt->wr_op = read_wr.opcode;
195 read_wr.send_flags = IB_SEND_SIGNALED;
196 read_wr.wr.rdma.rkey = rs_handle;
197 read_wr.wr.rdma.remote_addr = rs_offset;
198 read_wr.sg_list = ctxt->sge;
199 read_wr.num_sge = pages_needed;
200
201 ret = svc_rdma_send(xprt, &read_wr);
202 if (ret) {
203 pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
204 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
205 goto err;
206 }
207
208
209 *page_no = pg_no;
210 *page_offset = pg_off;
211 ret = read;
212 atomic_inc(&rdma_stat_read);
213 return ret;
214 err:
215 svc_rdma_unmap_dma(ctxt);
216 svc_rdma_put_context(ctxt, 0);
217 return ret;
218}
219
220
221int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
222 struct svc_rqst *rqstp,
223 struct svc_rdma_op_ctxt *head,
224 int *page_no,
225 u32 *page_offset,
226 u32 rs_handle,
227 u32 rs_length,
228 u64 rs_offset,
229 bool last)
230{
231 struct ib_send_wr read_wr;
232 struct ib_send_wr inv_wr;
233 struct ib_send_wr fastreg_wr;
234 u8 key;
235 int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
236 struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
237 struct svc_rdma_fastreg_mr *frmr = svc_rdma_get_frmr(xprt);
238 int ret, read, pno;
239 u32 pg_off = *page_offset;
240 u32 pg_no = *page_no;
241
242 if (IS_ERR(frmr))
243 return -ENOMEM;
244
245 ctxt->direction = DMA_FROM_DEVICE;
246 ctxt->frmr = frmr;
247 pages_needed = min_t(int, pages_needed, xprt->sc_frmr_pg_list_len);
248 read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
249
250 frmr->kva = page_address(rqstp->rq_arg.pages[pg_no]);
251 frmr->direction = DMA_FROM_DEVICE;
252 frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
253 frmr->map_len = pages_needed << PAGE_SHIFT;
254 frmr->page_list_len = pages_needed;
255
256 for (pno = 0; pno < pages_needed; pno++) {
257 int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
258
259 head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
260 head->arg.page_len += len;
261 head->arg.len += len;
262 if (!pg_off)
263 head->count++;
264 rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
265 rqstp->rq_next_page = rqstp->rq_respages + 1;
266 frmr->page_list->page_list[pno] =
267 ib_dma_map_page(xprt->sc_cm_id->device,
268 head->arg.pages[pg_no], 0,
269 PAGE_SIZE, DMA_FROM_DEVICE);
270 ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
271 frmr->page_list->page_list[pno]);
272 if (ret)
273 goto err;
274 atomic_inc(&xprt->sc_dma_used);
275
276
277 pg_off += len;
278 if (pg_off == PAGE_SIZE) {
279 pg_off = 0;
280 pg_no++;
281 }
282 rs_length -= len;
283 }
284
285 if (last && rs_length == 0)
286 set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
287 else
288 clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
289
290
291 key = (u8)(frmr->mr->lkey & 0x000000FF);
292 ib_update_fast_reg_key(frmr->mr, ++key);
293
294 ctxt->sge[0].addr = (unsigned long)frmr->kva + *page_offset;
295 ctxt->sge[0].lkey = frmr->mr->lkey;
296 ctxt->sge[0].length = read;
297 ctxt->count = 1;
298 ctxt->read_hdr = head;
299
300
301 memset(&fastreg_wr, 0, sizeof(fastreg_wr));
302 fastreg_wr.opcode = IB_WR_FAST_REG_MR;
303 fastreg_wr.send_flags = IB_SEND_SIGNALED;
304 fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva;
305 fastreg_wr.wr.fast_reg.page_list = frmr->page_list;
306 fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len;
307 fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
308 fastreg_wr.wr.fast_reg.length = frmr->map_len;
309 fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags;
310 fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey;
311 fastreg_wr.next = &read_wr;
312
313
314 memset(&read_wr, 0, sizeof(read_wr));
315 read_wr.send_flags = IB_SEND_SIGNALED;
316 read_wr.wr.rdma.rkey = rs_handle;
317 read_wr.wr.rdma.remote_addr = rs_offset;
318 read_wr.sg_list = ctxt->sge;
319 read_wr.num_sge = 1;
320 if (xprt->sc_dev_caps & SVCRDMA_DEVCAP_READ_W_INV) {
321 read_wr.opcode = IB_WR_RDMA_READ_WITH_INV;
322 read_wr.wr_id = (unsigned long)ctxt;
323 read_wr.ex.invalidate_rkey = ctxt->frmr->mr->lkey;
324 } else {
325 read_wr.opcode = IB_WR_RDMA_READ;
326 read_wr.next = &inv_wr;
327
328 memset(&inv_wr, 0, sizeof(inv_wr));
329 inv_wr.wr_id = (unsigned long)ctxt;
330 inv_wr.opcode = IB_WR_LOCAL_INV;
331 inv_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_FENCE;
332 inv_wr.ex.invalidate_rkey = frmr->mr->lkey;
333 }
334 ctxt->wr_op = read_wr.opcode;
335
336
337 ret = svc_rdma_send(xprt, &fastreg_wr);
338 if (ret) {
339 pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
340 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
341 goto err;
342 }
343
344
345 *page_no = pg_no;
346 *page_offset = pg_off;
347 ret = read;
348 atomic_inc(&rdma_stat_read);
349 return ret;
350 err:
351 svc_rdma_unmap_dma(ctxt);
352 svc_rdma_put_context(ctxt, 0);
353 svc_rdma_put_frmr(xprt, frmr);
354 return ret;
355}
356
357static unsigned int
358rdma_rcl_chunk_count(struct rpcrdma_read_chunk *ch)
359{
360 unsigned int count;
361
362 for (count = 0; ch->rc_discrim != xdr_zero; ch++)
363 count++;
364 return count;
365}
366
367
368
369
370
371static int
372rdma_copy_tail(struct svc_rqst *rqstp, struct svc_rdma_op_ctxt *head,
373 u32 position, u32 byte_count, u32 page_offset, int page_no)
374{
375 char *srcp, *destp;
376 int ret;
377
378 ret = 0;
379 srcp = head->arg.head[0].iov_base + position;
380 byte_count = head->arg.head[0].iov_len - position;
381 if (byte_count > PAGE_SIZE) {
382 dprintk("svcrdma: large tail unsupported\n");
383 return 0;
384 }
385
386
387 if (page_offset != PAGE_SIZE) {
388 destp = page_address(rqstp->rq_arg.pages[page_no]);
389 destp += page_offset;
390 while (byte_count--) {
391 *destp++ = *srcp++;
392 page_offset++;
393 if (page_offset == PAGE_SIZE && byte_count)
394 goto more;
395 }
396 goto done;
397 }
398
399more:
400
401 page_no++;
402 destp = page_address(rqstp->rq_arg.pages[page_no]);
403 while (byte_count--)
404 *destp++ = *srcp++;
405
406 rqstp->rq_respages = &rqstp->rq_arg.pages[page_no+1];
407 rqstp->rq_next_page = rqstp->rq_respages + 1;
408
409done:
410 byte_count = head->arg.head[0].iov_len - position;
411 head->arg.page_len += byte_count;
412 head->arg.len += byte_count;
413 head->arg.buflen += byte_count;
414 return 1;
415}
416
417static int rdma_read_chunks(struct svcxprt_rdma *xprt,
418 struct rpcrdma_msg *rmsgp,
419 struct svc_rqst *rqstp,
420 struct svc_rdma_op_ctxt *head)
421{
422 int page_no, ret;
423 struct rpcrdma_read_chunk *ch;
424 u32 handle, page_offset, byte_count;
425 u32 position;
426 u64 rs_offset;
427 bool last;
428
429
430 ch = svc_rdma_get_read_chunk(rmsgp);
431 if (!ch)
432 return 0;
433
434 if (rdma_rcl_chunk_count(ch) > RPCSVC_MAXPAGES)
435 return -EINVAL;
436
437
438
439
440
441 head->arg.head[0] = rqstp->rq_arg.head[0];
442 head->arg.tail[0] = rqstp->rq_arg.tail[0];
443 head->hdr_count = head->count;
444 head->arg.page_base = 0;
445 head->arg.page_len = 0;
446 head->arg.len = rqstp->rq_arg.len;
447 head->arg.buflen = rqstp->rq_arg.buflen;
448
449 ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
450 position = be32_to_cpu(ch->rc_position);
451
452
453 if (position == 0) {
454 head->arg.pages = &head->pages[0];
455 page_offset = head->byte_len;
456 } else {
457 head->arg.pages = &head->pages[head->count];
458 page_offset = 0;
459 }
460
461 ret = 0;
462 page_no = 0;
463 for (; ch->rc_discrim != xdr_zero; ch++) {
464 if (be32_to_cpu(ch->rc_position) != position)
465 goto err;
466
467 handle = be32_to_cpu(ch->rc_target.rs_handle),
468 byte_count = be32_to_cpu(ch->rc_target.rs_length);
469 xdr_decode_hyper((__be32 *)&ch->rc_target.rs_offset,
470 &rs_offset);
471
472 while (byte_count > 0) {
473 last = (ch + 1)->rc_discrim == xdr_zero;
474 ret = xprt->sc_reader(xprt, rqstp, head,
475 &page_no, &page_offset,
476 handle, byte_count,
477 rs_offset, last);
478 if (ret < 0)
479 goto err;
480 byte_count -= ret;
481 rs_offset += ret;
482 head->arg.buflen += ret;
483 }
484 }
485
486
487 if (page_offset & 3) {
488 u32 pad = 4 - (page_offset & 3);
489
490 head->arg.page_len += pad;
491 head->arg.len += pad;
492 head->arg.buflen += pad;
493 page_offset += pad;
494 }
495
496 ret = 1;
497 if (position && position < head->arg.head[0].iov_len)
498 ret = rdma_copy_tail(rqstp, head, position,
499 byte_count, page_offset, page_no);
500 head->arg.head[0].iov_len = position;
501 head->position = position;
502
503 err:
504
505 for (page_no = 0;
506 &rqstp->rq_pages[page_no] < rqstp->rq_respages; page_no++)
507 rqstp->rq_pages[page_no] = NULL;
508
509 return ret;
510}
511
512static int rdma_read_complete(struct svc_rqst *rqstp,
513 struct svc_rdma_op_ctxt *head)
514{
515 int page_no;
516 int ret;
517
518
519 for (page_no = 0; page_no < head->count; page_no++) {
520 put_page(rqstp->rq_pages[page_no]);
521 rqstp->rq_pages[page_no] = head->pages[page_no];
522 }
523
524
525 if (head->position == 0) {
526 if (head->arg.len <= head->sge[0].length) {
527 head->arg.head[0].iov_len = head->arg.len -
528 head->byte_len;
529 head->arg.page_len = 0;
530 } else {
531 head->arg.head[0].iov_len = head->sge[0].length -
532 head->byte_len;
533 head->arg.page_len = head->arg.len -
534 head->sge[0].length;
535 }
536 }
537
538
539 rqstp->rq_arg.pages = &rqstp->rq_pages[head->hdr_count];
540 rqstp->rq_arg.page_len = head->arg.page_len;
541 rqstp->rq_arg.page_base = head->arg.page_base;
542
543
544 rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
545 rqstp->rq_next_page = rqstp->rq_respages + 1;
546
547
548 rqstp->rq_arg.head[0] = head->arg.head[0];
549 rqstp->rq_arg.tail[0] = head->arg.tail[0];
550 rqstp->rq_arg.len = head->arg.len;
551 rqstp->rq_arg.buflen = head->arg.buflen;
552
553
554 svc_rdma_put_context(head, 0);
555
556
557 rqstp->rq_prot = IPPROTO_MAX;
558 svc_xprt_copy_addrs(rqstp, rqstp->rq_xprt);
559
560 ret = rqstp->rq_arg.head[0].iov_len
561 + rqstp->rq_arg.page_len
562 + rqstp->rq_arg.tail[0].iov_len;
563 dprintk("svcrdma: deferred read ret=%d, rq_arg.len=%u, "
564 "rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len=%zu\n",
565 ret, rqstp->rq_arg.len, rqstp->rq_arg.head[0].iov_base,
566 rqstp->rq_arg.head[0].iov_len);
567
568 return ret;
569}
570
571
572
573
574
575
576int svc_rdma_recvfrom(struct svc_rqst *rqstp)
577{
578 struct svc_xprt *xprt = rqstp->rq_xprt;
579 struct svcxprt_rdma *rdma_xprt =
580 container_of(xprt, struct svcxprt_rdma, sc_xprt);
581 struct svc_rdma_op_ctxt *ctxt = NULL;
582 struct rpcrdma_msg *rmsgp;
583 int ret = 0;
584 int len;
585
586 dprintk("svcrdma: rqstp=%p\n", rqstp);
587
588 spin_lock_bh(&rdma_xprt->sc_rq_dto_lock);
589 if (!list_empty(&rdma_xprt->sc_read_complete_q)) {
590 ctxt = list_entry(rdma_xprt->sc_read_complete_q.next,
591 struct svc_rdma_op_ctxt,
592 dto_q);
593 list_del_init(&ctxt->dto_q);
594 spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
595 return rdma_read_complete(rqstp, ctxt);
596 } else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) {
597 ctxt = list_entry(rdma_xprt->sc_rq_dto_q.next,
598 struct svc_rdma_op_ctxt,
599 dto_q);
600 list_del_init(&ctxt->dto_q);
601 } else {
602 atomic_inc(&rdma_stat_rq_starve);
603 clear_bit(XPT_DATA, &xprt->xpt_flags);
604 ctxt = NULL;
605 }
606 spin_unlock_bh(&rdma_xprt->sc_rq_dto_lock);
607 if (!ctxt) {
608
609
610
611
612
613 if (test_bit(XPT_CLOSE, &xprt->xpt_flags))
614 goto close_out;
615
616 goto out;
617 }
618 dprintk("svcrdma: processing ctxt=%p on xprt=%p, rqstp=%p, status=%d\n",
619 ctxt, rdma_xprt, rqstp, ctxt->wc_status);
620 atomic_inc(&rdma_stat_recv);
621
622
623 rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len);
624
625
626 len = svc_rdma_xdr_decode_req(&rmsgp, rqstp);
627 rqstp->rq_xprt_hlen = len;
628
629
630 if (len < 0) {
631 if (len == -ENOSYS)
632 svc_rdma_send_error(rdma_xprt, rmsgp, ERR_VERS);
633 goto close_out;
634 }
635
636
637 ret = rdma_read_chunks(rdma_xprt, rmsgp, rqstp, ctxt);
638 if (ret > 0) {
639
640 goto defer;
641 } else if (ret < 0) {
642
643 svc_rdma_put_context(ctxt, 1);
644 return 0;
645 }
646
647 ret = rqstp->rq_arg.head[0].iov_len
648 + rqstp->rq_arg.page_len
649 + rqstp->rq_arg.tail[0].iov_len;
650 svc_rdma_put_context(ctxt, 0);
651 out:
652 dprintk("svcrdma: ret=%d, rq_arg.len=%u, "
653 "rq_arg.head[0].iov_base=%p, rq_arg.head[0].iov_len=%zd\n",
654 ret, rqstp->rq_arg.len,
655 rqstp->rq_arg.head[0].iov_base,
656 rqstp->rq_arg.head[0].iov_len);
657 rqstp->rq_prot = IPPROTO_MAX;
658 svc_xprt_copy_addrs(rqstp, xprt);
659 return ret;
660
661 close_out:
662 if (ctxt)
663 svc_rdma_put_context(ctxt, 1);
664 dprintk("svcrdma: transport %p is closing\n", xprt);
665
666
667
668
669 set_bit(XPT_CLOSE, &xprt->xpt_flags);
670defer:
671 return 0;
672}
673