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WIP FPC-III support
[linux/fpc-iii.git] / drivers / infiniband / sw / siw / siw_qp_rx.c
blob4bd1f1f84057bd1977af05bb48c5077d0c865aef
1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2
3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4 /* Copyright (c) 2008-2019, IBM Corporation */
5
6 #include <linux/errno.h>
7 #include <linux/types.h>
8 #include <linux/net.h>
9 #include <linux/scatterlist.h>
10 #include <linux/highmem.h>
11
12 #include <rdma/iw_cm.h>
13 #include <rdma/ib_verbs.h>
14
15 #include "siw.h"
16 #include "siw_verbs.h"
17 #include "siw_mem.h"
18
19 /*
20 * siw_rx_umem()
21 *
22 * Receive data of @len into target referenced by @dest_addr.
23 *
24 * @srx: Receive Context
25 * @umem: siw representation of target memory
26 * @dest_addr: user virtual address
27 * @len: number of bytes to place
28 */
29 static int siw_rx_umem(struct siw_rx_stream *srx, struct siw_umem *umem,
30 u64 dest_addr, int len)
31 {
32 int copied = 0;
33
34 while (len) {
35 struct page *p;
36 int pg_off, bytes, rv;
37 void *dest;
38
39 p = siw_get_upage(umem, dest_addr);
40 if (unlikely(!p)) {
41 pr_warn("siw: %s: [QP %u]: bogus addr: %pK, %pK\n",
42 __func__, qp_id(rx_qp(srx)),
43 (void *)(uintptr_t)dest_addr,
44 (void *)(uintptr_t)umem->fp_addr);
45 /* siw internal error */
46 srx->skb_copied += copied;
47 srx->skb_new -= copied;
48
49 return -EFAULT;
50 }
51 pg_off = dest_addr & ~PAGE_MASK;
52 bytes = min(len, (int)PAGE_SIZE - pg_off);
53
54 siw_dbg_qp(rx_qp(srx), "page %pK, bytes=%u\n", p, bytes);
55
56 dest = kmap_atomic(p);
57 rv = skb_copy_bits(srx->skb, srx->skb_offset, dest + pg_off,
58 bytes);
59
60 if (unlikely(rv)) {
61 kunmap_atomic(dest);
62 srx->skb_copied += copied;
63 srx->skb_new -= copied;
64
65 pr_warn("siw: [QP %u]: %s, len %d, page %p, rv %d\n",
66 qp_id(rx_qp(srx)), __func__, len, p, rv);
67
68 return -EFAULT;
69 }
70 if (srx->mpa_crc_hd) {
71 if (rdma_is_kernel_res(&rx_qp(srx)->base_qp.res)) {
72 crypto_shash_update(srx->mpa_crc_hd,
73 (u8 *)(dest + pg_off), bytes);
74 kunmap_atomic(dest);
75 } else {
76 kunmap_atomic(dest);
77 /*
78 * Do CRC on original, not target buffer.
79 * Some user land applications may
80 * concurrently write the target buffer,
81 * which would yield a broken CRC.
82 * Walking the skb twice is very ineffcient.
83 * Folding the CRC into skb_copy_bits()
84 * would be much better, but is currently
85 * not supported.
86 */
87 siw_crc_skb(srx, bytes);
88 }
89 } else {
90 kunmap_atomic(dest);
91 }
92 srx->skb_offset += bytes;
93 copied += bytes;
94 len -= bytes;
95 dest_addr += bytes;
96 pg_off = 0;
97 }
98 srx->skb_copied += copied;
99 srx->skb_new -= copied;
100
101 return copied;
102 }
103
104 static int siw_rx_kva(struct siw_rx_stream *srx, void *kva, int len)
105 {
106 int rv;
107
108 siw_dbg_qp(rx_qp(srx), "kva: 0x%pK, len: %u\n", kva, len);
109
110 rv = skb_copy_bits(srx->skb, srx->skb_offset, kva, len);
111 if (unlikely(rv)) {
112 pr_warn("siw: [QP %u]: %s, len %d, kva 0x%pK, rv %d\n",
113 qp_id(rx_qp(srx)), __func__, len, kva, rv);
114
115 return rv;
116 }
117 if (srx->mpa_crc_hd)
118 crypto_shash_update(srx->mpa_crc_hd, (u8 *)kva, len);
119
120 srx->skb_offset += len;
121 srx->skb_copied += len;
122 srx->skb_new -= len;
123
124 return len;
125 }
126
127 static int siw_rx_pbl(struct siw_rx_stream *srx, int *pbl_idx,
128 struct siw_mem *mem, u64 addr, int len)
129 {
130 struct siw_pbl *pbl = mem->pbl;
131 u64 offset = addr - mem->va;
132 int copied = 0;
133
134 while (len) {
135 int bytes;
136 dma_addr_t buf_addr =
137 siw_pbl_get_buffer(pbl, offset, &bytes, pbl_idx);
138 if (!buf_addr)
139 break;
140
141 bytes = min(bytes, len);
142 if (siw_rx_kva(srx, (void *)(uintptr_t)buf_addr, bytes) ==
143 bytes) {
144 copied += bytes;
145 offset += bytes;
146 len -= bytes;
147 } else {
148 break;
149 }
150 }
151 return copied;
152 }
153
154 /*
155 * siw_rresp_check_ntoh()
156 *
157 * Check incoming RRESP fragment header against expected
158 * header values and update expected values for potential next
159 * fragment.
160 *
161 * NOTE: This function must be called only if a RRESP DDP segment
162 * starts but not for fragmented consecutive pieces of an
163 * already started DDP segment.
164 */
165 static int siw_rresp_check_ntoh(struct siw_rx_stream *srx,
166 struct siw_rx_fpdu *frx)
167 {
168 struct iwarp_rdma_rresp *rresp = &srx->hdr.rresp;
169 struct siw_wqe *wqe = &frx->wqe_active;
170 enum ddp_ecode ecode;
171
172 u32 sink_stag = be32_to_cpu(rresp->sink_stag);
173 u64 sink_to = be64_to_cpu(rresp->sink_to);
174
175 if (frx->first_ddp_seg) {
176 srx->ddp_stag = wqe->sqe.sge[0].lkey;
177 srx->ddp_to = wqe->sqe.sge[0].laddr;
178 frx->pbl_idx = 0;
179 }
180 /* Below checks extend beyond the semantics of DDP, and
181 * into RDMAP:
182 * We check if the read response matches exactly the
183 * read request which was send to the remote peer to
184 * trigger this read response. RFC5040/5041 do not
185 * always have a proper error code for the detected
186 * error cases. We choose 'base or bounds error' for
187 * cases where the inbound STag is valid, but offset
188 * or length do not match our response receive state.
189 */
190 if (unlikely(srx->ddp_stag != sink_stag)) {
191 pr_warn("siw: [QP %u]: rresp stag: %08x != %08x\n",
192 qp_id(rx_qp(srx)), sink_stag, srx->ddp_stag);
193 ecode = DDP_ECODE_T_INVALID_STAG;
194 goto error;
195 }
196 if (unlikely(srx->ddp_to != sink_to)) {
197 pr_warn("siw: [QP %u]: rresp off: %016llx != %016llx\n",
198 qp_id(rx_qp(srx)), (unsigned long long)sink_to,
199 (unsigned long long)srx->ddp_to);
200 ecode = DDP_ECODE_T_BASE_BOUNDS;
201 goto error;
202 }
203 if (unlikely(!frx->more_ddp_segs &&
204 (wqe->processed + srx->fpdu_part_rem != wqe->bytes))) {
205 pr_warn("siw: [QP %u]: rresp len: %d != %d\n",
206 qp_id(rx_qp(srx)),
207 wqe->processed + srx->fpdu_part_rem, wqe->bytes);
208 ecode = DDP_ECODE_T_BASE_BOUNDS;
209 goto error;
210 }
211 return 0;
212 error:
213 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
214 DDP_ETYPE_TAGGED_BUF, ecode, 0);
215 return -EINVAL;
216 }
217
218 /*
219 * siw_write_check_ntoh()
220 *
221 * Check incoming WRITE fragment header against expected
222 * header values and update expected values for potential next
223 * fragment
224 *
225 * NOTE: This function must be called only if a WRITE DDP segment
226 * starts but not for fragmented consecutive pieces of an
227 * already started DDP segment.
228 */
229 static int siw_write_check_ntoh(struct siw_rx_stream *srx,
230 struct siw_rx_fpdu *frx)
231 {
232 struct iwarp_rdma_write *write = &srx->hdr.rwrite;
233 enum ddp_ecode ecode;
234
235 u32 sink_stag = be32_to_cpu(write->sink_stag);
236 u64 sink_to = be64_to_cpu(write->sink_to);
237
238 if (frx->first_ddp_seg) {
239 srx->ddp_stag = sink_stag;
240 srx->ddp_to = sink_to;
241 frx->pbl_idx = 0;
242 } else {
243 if (unlikely(srx->ddp_stag != sink_stag)) {
244 pr_warn("siw: [QP %u]: write stag: %08x != %08x\n",
245 qp_id(rx_qp(srx)), sink_stag,
246 srx->ddp_stag);
247 ecode = DDP_ECODE_T_INVALID_STAG;
248 goto error;
249 }
250 if (unlikely(srx->ddp_to != sink_to)) {
251 pr_warn("siw: [QP %u]: write off: %016llx != %016llx\n",
252 qp_id(rx_qp(srx)),
253 (unsigned long long)sink_to,
254 (unsigned long long)srx->ddp_to);
255 ecode = DDP_ECODE_T_BASE_BOUNDS;
256 goto error;
257 }
258 }
259 return 0;
260 error:
261 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
262 DDP_ETYPE_TAGGED_BUF, ecode, 0);
263 return -EINVAL;
264 }
265
266 /*
267 * siw_send_check_ntoh()
268 *
269 * Check incoming SEND fragment header against expected
270 * header values and update expected MSN if no next
271 * fragment expected
272 *
273 * NOTE: This function must be called only if a SEND DDP segment
274 * starts but not for fragmented consecutive pieces of an
275 * already started DDP segment.
276 */
277 static int siw_send_check_ntoh(struct siw_rx_stream *srx,
278 struct siw_rx_fpdu *frx)
279 {
280 struct iwarp_send_inv *send = &srx->hdr.send_inv;
281 struct siw_wqe *wqe = &frx->wqe_active;
282 enum ddp_ecode ecode;
283
284 u32 ddp_msn = be32_to_cpu(send->ddp_msn);
285 u32 ddp_mo = be32_to_cpu(send->ddp_mo);
286 u32 ddp_qn = be32_to_cpu(send->ddp_qn);
287
288 if (unlikely(ddp_qn != RDMAP_UNTAGGED_QN_SEND)) {
289 pr_warn("siw: [QP %u]: invalid ddp qn %d for send\n",
290 qp_id(rx_qp(srx)), ddp_qn);
291 ecode = DDP_ECODE_UT_INVALID_QN;
292 goto error;
293 }
294 if (unlikely(ddp_msn != srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND])) {
295 pr_warn("siw: [QP %u]: send msn: %u != %u\n",
296 qp_id(rx_qp(srx)), ddp_msn,
297 srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]);
298 ecode = DDP_ECODE_UT_INVALID_MSN_RANGE;
299 goto error;
300 }
301 if (unlikely(ddp_mo != wqe->processed)) {
302 pr_warn("siw: [QP %u], send mo: %u != %u\n",
303 qp_id(rx_qp(srx)), ddp_mo, wqe->processed);
304 ecode = DDP_ECODE_UT_INVALID_MO;
305 goto error;
306 }
307 if (frx->first_ddp_seg) {
308 /* initialize user memory write position */
309 frx->sge_idx = 0;
310 frx->sge_off = 0;
311 frx->pbl_idx = 0;
312
313 /* only valid for SEND_INV and SEND_SE_INV operations */
314 srx->inval_stag = be32_to_cpu(send->inval_stag);
315 }
316 if (unlikely(wqe->bytes < wqe->processed + srx->fpdu_part_rem)) {
317 siw_dbg_qp(rx_qp(srx), "receive space short: %d - %d < %d\n",
318 wqe->bytes, wqe->processed, srx->fpdu_part_rem);
319 wqe->wc_status = SIW_WC_LOC_LEN_ERR;
320 ecode = DDP_ECODE_UT_INVALID_MSN_NOBUF;
321 goto error;
322 }
323 return 0;
324 error:
325 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
326 DDP_ETYPE_UNTAGGED_BUF, ecode, 0);
327 return -EINVAL;
328 }
329
330 static struct siw_wqe *siw_rqe_get(struct siw_qp *qp)
331 {
332 struct siw_rqe *rqe;
333 struct siw_srq *srq;
334 struct siw_wqe *wqe = NULL;
335 bool srq_event = false;
336 unsigned long flags;
337
338 srq = qp->srq;
339 if (srq) {
340 spin_lock_irqsave(&srq->lock, flags);
341 if (unlikely(!srq->num_rqe))
342 goto out;
343
344 rqe = &srq->recvq[srq->rq_get % srq->num_rqe];
345 } else {
346 if (unlikely(!qp->recvq))
347 goto out;
348
349 rqe = &qp->recvq[qp->rq_get % qp->attrs.rq_size];
350 }
351 if (likely(rqe->flags == SIW_WQE_VALID)) {
352 int num_sge = rqe->num_sge;
353
354 if (likely(num_sge <= SIW_MAX_SGE)) {
355 int i = 0;
356
357 wqe = rx_wqe(&qp->rx_untagged);
358 rx_type(wqe) = SIW_OP_RECEIVE;
359 wqe->wr_status = SIW_WR_INPROGRESS;
360 wqe->bytes = 0;
361 wqe->processed = 0;
362
363 wqe->rqe.id = rqe->id;
364 wqe->rqe.num_sge = num_sge;
365
366 while (i < num_sge) {
367 wqe->rqe.sge[i].laddr = rqe->sge[i].laddr;
368 wqe->rqe.sge[i].lkey = rqe->sge[i].lkey;
369 wqe->rqe.sge[i].length = rqe->sge[i].length;
370 wqe->bytes += wqe->rqe.sge[i].length;
371 wqe->mem[i] = NULL;
372 i++;
373 }
374 /* can be re-used by appl */
375 smp_store_mb(rqe->flags, 0);
376 } else {
377 siw_dbg_qp(qp, "too many sge's: %d\n", rqe->num_sge);
378 if (srq)
379 spin_unlock_irqrestore(&srq->lock, flags);
380 return NULL;
381 }
382 if (!srq) {
383 qp->rq_get++;
384 } else {
385 if (srq->armed) {
386 /* Test SRQ limit */
387 u32 off = (srq->rq_get + srq->limit) %
388 srq->num_rqe;
389 struct siw_rqe *rqe2 = &srq->recvq[off];
390
391 if (!(rqe2->flags & SIW_WQE_VALID)) {
392 srq->armed = false;
393 srq_event = true;
394 }
395 }
396 srq->rq_get++;
397 }
398 }
399 out:
400 if (srq) {
401 spin_unlock_irqrestore(&srq->lock, flags);
402 if (srq_event)
403 siw_srq_event(srq, IB_EVENT_SRQ_LIMIT_REACHED);
404 }
405 return wqe;
406 }
407
408 /*
409 * siw_proc_send:
410 *
411 * Process one incoming SEND and place data into memory referenced by
412 * receive wqe.
413 *
414 * Function supports partially received sends (suspending/resuming
415 * current receive wqe processing)
416 *
417 * return value:
418 * 0: reached the end of a DDP segment
419 * -EAGAIN: to be called again to finish the DDP segment
420 */
421 int siw_proc_send(struct siw_qp *qp)
422 {
423 struct siw_rx_stream *srx = &qp->rx_stream;
424 struct siw_rx_fpdu *frx = &qp->rx_untagged;
425 struct siw_wqe *wqe;
426 u32 data_bytes; /* all data bytes available */
427 u32 rcvd_bytes; /* sum of data bytes rcvd */
428 int rv = 0;
429
430 if (frx->first_ddp_seg) {
431 wqe = siw_rqe_get(qp);
432 if (unlikely(!wqe)) {
433 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
434 DDP_ETYPE_UNTAGGED_BUF,
435 DDP_ECODE_UT_INVALID_MSN_NOBUF, 0);
436 return -ENOENT;
437 }
438 } else {
439 wqe = rx_wqe(frx);
440 }
441 if (srx->state == SIW_GET_DATA_START) {
442 rv = siw_send_check_ntoh(srx, frx);
443 if (unlikely(rv)) {
444 siw_qp_event(qp, IB_EVENT_QP_FATAL);
445 return rv;
446 }
447 if (!srx->fpdu_part_rem) /* zero length SEND */
448 return 0;
449 }
450 data_bytes = min(srx->fpdu_part_rem, srx->skb_new);
451 rcvd_bytes = 0;
452
453 /* A zero length SEND will skip below loop */
454 while (data_bytes) {
455 struct ib_pd *pd;
456 struct siw_mem **mem, *mem_p;
457 struct siw_sge *sge;
458 u32 sge_bytes; /* data bytes avail for SGE */
459
460 sge = &wqe->rqe.sge[frx->sge_idx];
461
462 if (!sge->length) {
463 /* just skip empty sge's */
464 frx->sge_idx++;
465 frx->sge_off = 0;
466 frx->pbl_idx = 0;
467 continue;
468 }
469 sge_bytes = min(data_bytes, sge->length - frx->sge_off);
470 mem = &wqe->mem[frx->sge_idx];
471
472 /*
473 * check with QP's PD if no SRQ present, SRQ's PD otherwise
474 */
475 pd = qp->srq == NULL ? qp->pd : qp->srq->base_srq.pd;
476
477 rv = siw_check_sge(pd, sge, mem, IB_ACCESS_LOCAL_WRITE,
478 frx->sge_off, sge_bytes);
479 if (unlikely(rv)) {
480 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
481 DDP_ETYPE_CATASTROPHIC,
482 DDP_ECODE_CATASTROPHIC, 0);
483
484 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
485 break;
486 }
487 mem_p = *mem;
488 if (mem_p->mem_obj == NULL)
489 rv = siw_rx_kva(srx,
490 (void *)(uintptr_t)(sge->laddr + frx->sge_off),
491 sge_bytes);
492 else if (!mem_p->is_pbl)
493 rv = siw_rx_umem(srx, mem_p->umem,
494 sge->laddr + frx->sge_off, sge_bytes);
495 else
496 rv = siw_rx_pbl(srx, &frx->pbl_idx, mem_p,
497 sge->laddr + frx->sge_off, sge_bytes);
498
499 if (unlikely(rv != sge_bytes)) {
500 wqe->processed += rcvd_bytes;
501
502 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
503 DDP_ETYPE_CATASTROPHIC,
504 DDP_ECODE_CATASTROPHIC, 0);
505 return -EINVAL;
506 }
507 frx->sge_off += rv;
508
509 if (frx->sge_off == sge->length) {
510 frx->sge_idx++;
511 frx->sge_off = 0;
512 frx->pbl_idx = 0;
513 }
514 data_bytes -= rv;
515 rcvd_bytes += rv;
516
517 srx->fpdu_part_rem -= rv;
518 srx->fpdu_part_rcvd += rv;
519 }
520 wqe->processed += rcvd_bytes;
521
522 if (!srx->fpdu_part_rem)
523 return 0;
524
525 return (rv < 0) ? rv : -EAGAIN;
526 }
527
528 /*
529 * siw_proc_write:
530 *
531 * Place incoming WRITE after referencing and checking target buffer
532
533 * Function supports partially received WRITEs (suspending/resuming
534 * current receive processing)
535 *
536 * return value:
537 * 0: reached the end of a DDP segment
538 * -EAGAIN: to be called again to finish the DDP segment
539 */
540 int siw_proc_write(struct siw_qp *qp)
541 {
542 struct siw_rx_stream *srx = &qp->rx_stream;
543 struct siw_rx_fpdu *frx = &qp->rx_tagged;
544 struct siw_mem *mem;
545 int bytes, rv;
546
547 if (srx->state == SIW_GET_DATA_START) {
548 if (!srx->fpdu_part_rem) /* zero length WRITE */
549 return 0;
550
551 rv = siw_write_check_ntoh(srx, frx);
552 if (unlikely(rv)) {
553 siw_qp_event(qp, IB_EVENT_QP_FATAL);
554 return rv;
555 }
556 }
557 bytes = min(srx->fpdu_part_rem, srx->skb_new);
558
559 if (frx->first_ddp_seg) {
560 struct siw_wqe *wqe = rx_wqe(frx);
561
562 rx_mem(frx) = siw_mem_id2obj(qp->sdev, srx->ddp_stag >> 8);
563 if (unlikely(!rx_mem(frx))) {
564 siw_dbg_qp(qp,
565 "sink stag not found/invalid, stag 0x%08x\n",
566 srx->ddp_stag);
567
568 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
569 DDP_ETYPE_TAGGED_BUF,
570 DDP_ECODE_T_INVALID_STAG, 0);
571 return -EINVAL;
572 }
573 wqe->rqe.num_sge = 1;
574 rx_type(wqe) = SIW_OP_WRITE;
575 wqe->wr_status = SIW_WR_INPROGRESS;
576 }
577 mem = rx_mem(frx);
578
579 /*
580 * Check if application re-registered memory with different
581 * key field of STag.
582 */
583 if (unlikely(mem->stag != srx->ddp_stag)) {
584 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
585 DDP_ETYPE_TAGGED_BUF,
586 DDP_ECODE_T_INVALID_STAG, 0);
587 return -EINVAL;
588 }
589 rv = siw_check_mem(qp->pd, mem, srx->ddp_to + srx->fpdu_part_rcvd,
590 IB_ACCESS_REMOTE_WRITE, bytes);
591 if (unlikely(rv)) {
592 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
593 DDP_ETYPE_TAGGED_BUF, siw_tagged_error(-rv),
594 0);
595
596 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
597
598 return -EINVAL;
599 }
600
601 if (mem->mem_obj == NULL)
602 rv = siw_rx_kva(srx,
603 (void *)(uintptr_t)(srx->ddp_to + srx->fpdu_part_rcvd),
604 bytes);
605 else if (!mem->is_pbl)
606 rv = siw_rx_umem(srx, mem->umem,
607 srx->ddp_to + srx->fpdu_part_rcvd, bytes);
608 else
609 rv = siw_rx_pbl(srx, &frx->pbl_idx, mem,
610 srx->ddp_to + srx->fpdu_part_rcvd, bytes);
611
612 if (unlikely(rv != bytes)) {
613 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
614 DDP_ETYPE_CATASTROPHIC,
615 DDP_ECODE_CATASTROPHIC, 0);
616 return -EINVAL;
617 }
618 srx->fpdu_part_rem -= rv;
619 srx->fpdu_part_rcvd += rv;
620
621 if (!srx->fpdu_part_rem) {
622 srx->ddp_to += srx->fpdu_part_rcvd;
623 return 0;
624 }
625 return -EAGAIN;
626 }
627
628 /*
629 * Inbound RREQ's cannot carry user data.
630 */
631 int siw_proc_rreq(struct siw_qp *qp)
632 {
633 struct siw_rx_stream *srx = &qp->rx_stream;
634
635 if (!srx->fpdu_part_rem)
636 return 0;
637
638 pr_warn("siw: [QP %u]: rreq with mpa len %d\n", qp_id(qp),
639 be16_to_cpu(srx->hdr.ctrl.mpa_len));
640
641 return -EPROTO;
642 }
643
644 /*
645 * siw_init_rresp:
646 *
647 * Process inbound RDMA READ REQ. Produce a pseudo READ RESPONSE WQE.
648 * Put it at the tail of the IRQ, if there is another WQE currently in
649 * transmit processing. If not, make it the current WQE to be processed
650 * and schedule transmit processing.
651 *
652 * Can be called from softirq context and from process
653 * context (RREAD socket loopback case!)
654 *
655 * return value:
656 * 0: success,
657 * failure code otherwise
658 */
659
660 static int siw_init_rresp(struct siw_qp *qp, struct siw_rx_stream *srx)
661 {
662 struct siw_wqe *tx_work = tx_wqe(qp);
663 struct siw_sqe *resp;
664
665 uint64_t raddr = be64_to_cpu(srx->hdr.rreq.sink_to),
666 laddr = be64_to_cpu(srx->hdr.rreq.source_to);
667 uint32_t length = be32_to_cpu(srx->hdr.rreq.read_size),
668 lkey = be32_to_cpu(srx->hdr.rreq.source_stag),
669 rkey = be32_to_cpu(srx->hdr.rreq.sink_stag),
670 msn = be32_to_cpu(srx->hdr.rreq.ddp_msn);
671
672 int run_sq = 1, rv = 0;
673 unsigned long flags;
674
675 if (unlikely(msn != srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ])) {
676 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
677 DDP_ETYPE_UNTAGGED_BUF,
678 DDP_ECODE_UT_INVALID_MSN_RANGE, 0);
679 return -EPROTO;
680 }
681 spin_lock_irqsave(&qp->sq_lock, flags);
682
683 if (tx_work->wr_status == SIW_WR_IDLE) {
684 /*
685 * immediately schedule READ response w/o
686 * consuming IRQ entry: IRQ must be empty.
687 */
688 tx_work->processed = 0;
689 tx_work->mem[0] = NULL;
690 tx_work->wr_status = SIW_WR_QUEUED;
691 resp = &tx_work->sqe;
692 } else {
693 resp = irq_alloc_free(qp);
694 run_sq = 0;
695 }
696 if (likely(resp)) {
697 resp->opcode = SIW_OP_READ_RESPONSE;
698
699 resp->sge[0].length = length;
700 resp->sge[0].laddr = laddr;
701 resp->sge[0].lkey = lkey;
702
703 /* Keep aside message sequence number for potential
704 * error reporting during Read Response generation.
705 */
706 resp->sge[1].length = msn;
707
708 resp->raddr = raddr;
709 resp->rkey = rkey;
710 resp->num_sge = length ? 1 : 0;
711
712 /* RRESP now valid as current TX wqe or placed into IRQ */
713 smp_store_mb(resp->flags, SIW_WQE_VALID);
714 } else {
715 pr_warn("siw: [QP %u]: irq %d exceeded %d\n", qp_id(qp),
716 qp->irq_put % qp->attrs.irq_size, qp->attrs.irq_size);
717
718 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
719 RDMAP_ETYPE_REMOTE_OPERATION,
720 RDMAP_ECODE_CATASTROPHIC_STREAM, 0);
721 rv = -EPROTO;
722 }
723
724 spin_unlock_irqrestore(&qp->sq_lock, flags);
725
726 if (run_sq)
727 rv = siw_sq_start(qp);
728
729 return rv;
730 }
731
732 /*
733 * Only called at start of Read.Resonse processing.
734 * Transfer pending Read from tip of ORQ into currrent rx wqe,
735 * but keep ORQ entry valid until Read.Response processing done.
736 * No Queue locking needed.
737 */
738 static int siw_orqe_start_rx(struct siw_qp *qp)
739 {
740 struct siw_sqe *orqe;
741 struct siw_wqe *wqe = NULL;
742
743 /* make sure ORQ indices are current */
744 smp_mb();
745
746 orqe = orq_get_current(qp);
747 if (READ_ONCE(orqe->flags) & SIW_WQE_VALID) {
748 /* RRESP is a TAGGED RDMAP operation */
749 wqe = rx_wqe(&qp->rx_tagged);
750 wqe->sqe.id = orqe->id;
751 wqe->sqe.opcode = orqe->opcode;
752 wqe->sqe.sge[0].laddr = orqe->sge[0].laddr;
753 wqe->sqe.sge[0].lkey = orqe->sge[0].lkey;
754 wqe->sqe.sge[0].length = orqe->sge[0].length;
755 wqe->sqe.flags = orqe->flags;
756 wqe->sqe.num_sge = 1;
757 wqe->bytes = orqe->sge[0].length;
758 wqe->processed = 0;
759 wqe->mem[0] = NULL;
760 /* make sure WQE is completely written before valid */
761 smp_wmb();
762 wqe->wr_status = SIW_WR_INPROGRESS;
763
764 return 0;
765 }
766 return -EPROTO;
767 }
768
769 /*
770 * siw_proc_rresp:
771 *
772 * Place incoming RRESP data into memory referenced by RREQ WQE
773 * which is at the tip of the ORQ
774 *
775 * Function supports partially received RRESP's (suspending/resuming
776 * current receive processing)
777 */
778 int siw_proc_rresp(struct siw_qp *qp)
779 {
780 struct siw_rx_stream *srx = &qp->rx_stream;
781 struct siw_rx_fpdu *frx = &qp->rx_tagged;
782 struct siw_wqe *wqe = rx_wqe(frx);
783 struct siw_mem **mem, *mem_p;
784 struct siw_sge *sge;
785 int bytes, rv;
786
787 if (frx->first_ddp_seg) {
788 if (unlikely(wqe->wr_status != SIW_WR_IDLE)) {
789 pr_warn("siw: [QP %u]: proc RRESP: status %d, op %d\n",
790 qp_id(qp), wqe->wr_status, wqe->sqe.opcode);
791 rv = -EPROTO;
792 goto error_term;
793 }
794 /*
795 * fetch pending RREQ from orq
796 */
797 rv = siw_orqe_start_rx(qp);
798 if (rv) {
799 pr_warn("siw: [QP %u]: ORQ empty at idx %d\n",
800 qp_id(qp), qp->orq_get % qp->attrs.orq_size);
801 goto error_term;
802 }
803 rv = siw_rresp_check_ntoh(srx, frx);
804 if (unlikely(rv)) {
805 siw_qp_event(qp, IB_EVENT_QP_FATAL);
806 return rv;
807 }
808 } else {
809 if (unlikely(wqe->wr_status != SIW_WR_INPROGRESS)) {
810 pr_warn("siw: [QP %u]: resume RRESP: status %d\n",
811 qp_id(qp), wqe->wr_status);
812 rv = -EPROTO;
813 goto error_term;
814 }
815 }
816 if (!srx->fpdu_part_rem) /* zero length RRESPONSE */
817 return 0;
818
819 sge = wqe->sqe.sge; /* there is only one */
820 mem = &wqe->mem[0];
821
822 if (!(*mem)) {
823 /*
824 * check target memory which resolves memory on first fragment
825 */
826 rv = siw_check_sge(qp->pd, sge, mem, IB_ACCESS_LOCAL_WRITE, 0,
827 wqe->bytes);
828 if (unlikely(rv)) {
829 siw_dbg_qp(qp, "target mem check: %d\n", rv);
830 wqe->wc_status = SIW_WC_LOC_PROT_ERR;
831
832 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
833 DDP_ETYPE_TAGGED_BUF,
834 siw_tagged_error(-rv), 0);
835
836 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
837
838 return -EINVAL;
839 }
840 }
841 mem_p = *mem;
842
843 bytes = min(srx->fpdu_part_rem, srx->skb_new);
844
845 if (mem_p->mem_obj == NULL)
846 rv = siw_rx_kva(srx,
847 (void *)(uintptr_t)(sge->laddr + wqe->processed),
848 bytes);
849 else if (!mem_p->is_pbl)
850 rv = siw_rx_umem(srx, mem_p->umem, sge->laddr + wqe->processed,
851 bytes);
852 else
853 rv = siw_rx_pbl(srx, &frx->pbl_idx, mem_p,
854 sge->laddr + wqe->processed, bytes);
855 if (rv != bytes) {
856 wqe->wc_status = SIW_WC_GENERAL_ERR;
857 rv = -EINVAL;
858 goto error_term;
859 }
860 srx->fpdu_part_rem -= rv;
861 srx->fpdu_part_rcvd += rv;
862 wqe->processed += rv;
863
864 if (!srx->fpdu_part_rem) {
865 srx->ddp_to += srx->fpdu_part_rcvd;
866 return 0;
867 }
868 return -EAGAIN;
869
870 error_term:
871 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, DDP_ETYPE_CATASTROPHIC,
872 DDP_ECODE_CATASTROPHIC, 0);
873 return rv;
874 }
875
876 int siw_proc_terminate(struct siw_qp *qp)
877 {
878 struct siw_rx_stream *srx = &qp->rx_stream;
879 struct sk_buff *skb = srx->skb;
880 struct iwarp_terminate *term = &srx->hdr.terminate;
881 union iwarp_hdr term_info;
882 u8 *infop = (u8 *)&term_info;
883 enum rdma_opcode op;
884 u16 to_copy = sizeof(struct iwarp_ctrl);
885
886 pr_warn("siw: got TERMINATE. layer %d, type %d, code %d\n",
887 __rdmap_term_layer(term), __rdmap_term_etype(term),
888 __rdmap_term_ecode(term));
889
890 if (be32_to_cpu(term->ddp_qn) != RDMAP_UNTAGGED_QN_TERMINATE ||
891 be32_to_cpu(term->ddp_msn) !=
892 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] ||
893 be32_to_cpu(term->ddp_mo) != 0) {
894 pr_warn("siw: rx bogus TERM [QN x%08x, MSN x%08x, MO x%08x]\n",
895 be32_to_cpu(term->ddp_qn), be32_to_cpu(term->ddp_msn),
896 be32_to_cpu(term->ddp_mo));
897 return -ECONNRESET;
898 }
899 /*
900 * Receive remaining pieces of TERM if indicated
901 */
902 if (!term->flag_m)
903 return -ECONNRESET;
904
905 /* Do not take the effort to reassemble a network fragmented
906 * TERM message
907 */
908 if (srx->skb_new < sizeof(struct iwarp_ctrl_tagged))
909 return -ECONNRESET;
910
911 memset(infop, 0, sizeof(term_info));
912
913 skb_copy_bits(skb, srx->skb_offset, infop, to_copy);
914
915 op = __rdmap_get_opcode(&term_info.ctrl);
916 if (op >= RDMAP_TERMINATE)
917 goto out;
918
919 infop += to_copy;
920 srx->skb_offset += to_copy;
921 srx->skb_new -= to_copy;
922 srx->skb_copied += to_copy;
923 srx->fpdu_part_rcvd += to_copy;
924 srx->fpdu_part_rem -= to_copy;
925
926 to_copy = iwarp_pktinfo[op].hdr_len - to_copy;
927
928 /* Again, no network fragmented TERM's */
929 if (to_copy + MPA_CRC_SIZE > srx->skb_new)
930 return -ECONNRESET;
931
932 skb_copy_bits(skb, srx->skb_offset, infop, to_copy);
933
934 if (term->flag_r) {
935 siw_dbg_qp(qp, "TERM reports RDMAP hdr type %u, len %u (%s)\n",
936 op, be16_to_cpu(term_info.ctrl.mpa_len),
937 term->flag_m ? "valid" : "invalid");
938 } else if (term->flag_d) {
939 siw_dbg_qp(qp, "TERM reports DDP hdr type %u, len %u (%s)\n",
940 op, be16_to_cpu(term_info.ctrl.mpa_len),
941 term->flag_m ? "valid" : "invalid");
942 }
943 out:
944 srx->skb_new -= to_copy;
945 srx->skb_offset += to_copy;
946 srx->skb_copied += to_copy;
947 srx->fpdu_part_rcvd += to_copy;
948 srx->fpdu_part_rem -= to_copy;
949
950 return -ECONNRESET;
951 }
952
953 static int siw_get_trailer(struct siw_qp *qp, struct siw_rx_stream *srx)
954 {
955 struct sk_buff *skb = srx->skb;
956 u8 *tbuf = (u8 *)&srx->trailer.crc - srx->pad;
957 __wsum crc_in, crc_own = 0;
958
959 siw_dbg_qp(qp, "expected %d, available %d, pad %u\n",
960 srx->fpdu_part_rem, srx->skb_new, srx->pad);
961
962 if (srx->skb_new < srx->fpdu_part_rem)
963 return -EAGAIN;
964
965 skb_copy_bits(skb, srx->skb_offset, tbuf, srx->fpdu_part_rem);
966
967 if (srx->mpa_crc_hd && srx->pad)
968 crypto_shash_update(srx->mpa_crc_hd, tbuf, srx->pad);
969
970 srx->skb_new -= srx->fpdu_part_rem;
971 srx->skb_offset += srx->fpdu_part_rem;
972 srx->skb_copied += srx->fpdu_part_rem;
973
974 if (!srx->mpa_crc_hd)
975 return 0;
976
977 /*
978 * CRC32 is computed, transmitted and received directly in NBO,
979 * so there's never a reason to convert byte order.
980 */
981 crypto_shash_final(srx->mpa_crc_hd, (u8 *)&crc_own);
982 crc_in = (__force __wsum)srx->trailer.crc;
983
984 if (unlikely(crc_in != crc_own)) {
985 pr_warn("siw: crc error. in: %08x, own %08x, op %u\n",
986 crc_in, crc_own, qp->rx_stream.rdmap_op);
987
988 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
989 LLP_ETYPE_MPA,
990 LLP_ECODE_RECEIVED_CRC, 0);
991 return -EINVAL;
992 }
993 return 0;
994 }
995
996 #define MIN_DDP_HDR sizeof(struct iwarp_ctrl_tagged)
997
998 static int siw_get_hdr(struct siw_rx_stream *srx)
999 {
1000 struct sk_buff *skb = srx->skb;
1001 struct siw_qp *qp = rx_qp(srx);
1002 struct iwarp_ctrl *c_hdr = &srx->hdr.ctrl;
1003 struct siw_rx_fpdu *frx;
1004 u8 opcode;
1005 int bytes;
1006
1007 if (srx->fpdu_part_rcvd < MIN_DDP_HDR) {
1008 /*
1009 * copy a mimimum sized (tagged) DDP frame control part
1010 */
1011 bytes = min_t(int, srx->skb_new,
1012 MIN_DDP_HDR - srx->fpdu_part_rcvd);
1013
1014 skb_copy_bits(skb, srx->skb_offset,
1015 (char *)c_hdr + srx->fpdu_part_rcvd, bytes);
1016
1017 srx->fpdu_part_rcvd += bytes;
1018
1019 srx->skb_new -= bytes;
1020 srx->skb_offset += bytes;
1021 srx->skb_copied += bytes;
1022
1023 if (srx->fpdu_part_rcvd < MIN_DDP_HDR)
1024 return -EAGAIN;
1025
1026 if (unlikely(__ddp_get_version(c_hdr) != DDP_VERSION)) {
1027 enum ddp_etype etype;
1028 enum ddp_ecode ecode;
1029
1030 pr_warn("siw: received ddp version unsupported %d\n",
1031 __ddp_get_version(c_hdr));
1032
1033 if (c_hdr->ddp_rdmap_ctrl & DDP_FLAG_TAGGED) {
1034 etype = DDP_ETYPE_TAGGED_BUF;
1035 ecode = DDP_ECODE_T_VERSION;
1036 } else {
1037 etype = DDP_ETYPE_UNTAGGED_BUF;
1038 ecode = DDP_ECODE_UT_VERSION;
1039 }
1040 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
1041 etype, ecode, 0);
1042 return -EINVAL;
1043 }
1044 if (unlikely(__rdmap_get_version(c_hdr) != RDMAP_VERSION)) {
1045 pr_warn("siw: received rdmap version unsupported %d\n",
1046 __rdmap_get_version(c_hdr));
1047
1048 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP,
1049 RDMAP_ETYPE_REMOTE_OPERATION,
1050 RDMAP_ECODE_VERSION, 0);
1051 return -EINVAL;
1052 }
1053 opcode = __rdmap_get_opcode(c_hdr);
1054
1055 if (opcode > RDMAP_TERMINATE) {
1056 pr_warn("siw: received unknown packet type %u\n",
1057 opcode);
1058
1059 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP,
1060 RDMAP_ETYPE_REMOTE_OPERATION,
1061 RDMAP_ECODE_OPCODE, 0);
1062 return -EINVAL;
1063 }
1064 siw_dbg_qp(rx_qp(srx), "new header, opcode %u\n", opcode);
1065 } else {
1066 opcode = __rdmap_get_opcode(c_hdr);
1067 }
1068 set_rx_fpdu_context(qp, opcode);
1069 frx = qp->rx_fpdu;
1070
1071 /*
1072 * Figure out len of current hdr: variable length of
1073 * iwarp hdr may force us to copy hdr information in
1074 * two steps. Only tagged DDP messages are already
1075 * completely received.
1076 */
1077 if (iwarp_pktinfo[opcode].hdr_len > sizeof(struct iwarp_ctrl_tagged)) {
1078 bytes = iwarp_pktinfo[opcode].hdr_len - MIN_DDP_HDR;
1079
1080 if (srx->skb_new < bytes)
1081 return -EAGAIN;
1082
1083 skb_copy_bits(skb, srx->skb_offset,
1084 (char *)c_hdr + srx->fpdu_part_rcvd, bytes);
1085
1086 srx->fpdu_part_rcvd += bytes;
1087
1088 srx->skb_new -= bytes;
1089 srx->skb_offset += bytes;
1090 srx->skb_copied += bytes;
1091 }
1092
1093 /*
1094 * DDP/RDMAP header receive completed. Check if the current
1095 * DDP segment starts a new RDMAP message or continues a previously
1096 * started RDMAP message.
1097 *
1098 * Alternating reception of DDP segments (or FPDUs) from incomplete
1099 * tagged and untagged RDMAP messages is supported, as long as
1100 * the current tagged or untagged message gets eventually completed
1101 * w/o intersection from another message of the same type
1102 * (tagged/untagged). E.g., a WRITE can get intersected by a SEND,
1103 * but not by a READ RESPONSE etc.
1104 */
1105 if (srx->mpa_crc_hd) {
1106 /*
1107 * Restart CRC computation
1108 */
1109 crypto_shash_init(srx->mpa_crc_hd);
1110 crypto_shash_update(srx->mpa_crc_hd, (u8 *)c_hdr,
1111 srx->fpdu_part_rcvd);
1112 }
1113 if (frx->more_ddp_segs) {
1114 frx->first_ddp_seg = 0;
1115 if (frx->prev_rdmap_op != opcode) {
1116 pr_warn("siw: packet intersection: %u : %u\n",
1117 frx->prev_rdmap_op, opcode);
1118 /*
1119 * The last inbound RDMA operation of same type
1120 * (tagged or untagged) is left unfinished.
1121 * To complete it in error, make it the current
1122 * operation again, even with the header already
1123 * overwritten. For error handling, only the opcode
1124 * and current rx context are relevant.
1125 */
1126 set_rx_fpdu_context(qp, frx->prev_rdmap_op);
1127 __rdmap_set_opcode(c_hdr, frx->prev_rdmap_op);
1128 return -EPROTO;
1129 }
1130 } else {
1131 frx->prev_rdmap_op = opcode;
1132 frx->first_ddp_seg = 1;
1133 }
1134 frx->more_ddp_segs = c_hdr->ddp_rdmap_ctrl & DDP_FLAG_LAST ? 0 : 1;
1135
1136 return 0;
1137 }
1138
1139 static int siw_check_tx_fence(struct siw_qp *qp)
1140 {
1141 struct siw_wqe *tx_waiting = tx_wqe(qp);
1142 struct siw_sqe *rreq;
1143 int resume_tx = 0, rv = 0;
1144 unsigned long flags;
1145
1146 spin_lock_irqsave(&qp->orq_lock, flags);
1147
1148 rreq = orq_get_current(qp);
1149
1150 /* free current orq entry */
1151 WRITE_ONCE(rreq->flags, 0);
1152
1153 if (qp->tx_ctx.orq_fence) {
1154 if (unlikely(tx_waiting->wr_status != SIW_WR_QUEUED)) {
1155 pr_warn("siw: [QP %u]: fence resume: bad status %d\n",
1156 qp_id(qp), tx_waiting->wr_status);
1157 rv = -EPROTO;
1158 goto out;
1159 }
1160 /* resume SQ processing */
1161 if (tx_waiting->sqe.opcode == SIW_OP_READ ||
1162 tx_waiting->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
1163 rreq = orq_get_tail(qp);
1164 if (unlikely(!rreq)) {
1165 pr_warn("siw: [QP %u]: no ORQE\n", qp_id(qp));
1166 rv = -EPROTO;
1167 goto out;
1168 }
1169 siw_read_to_orq(rreq, &tx_waiting->sqe);
1170
1171 qp->orq_put++;
1172 qp->tx_ctx.orq_fence = 0;
1173 resume_tx = 1;
1174
1175 } else if (siw_orq_empty(qp)) {
1176 qp->tx_ctx.orq_fence = 0;
1177 resume_tx = 1;
1178 } else {
1179 pr_warn("siw: [QP %u]: fence resume: orq idx: %d:%d\n",
1180 qp_id(qp), qp->orq_get, qp->orq_put);
1181 rv = -EPROTO;
1182 }
1183 }
1184 qp->orq_get++;
1185 out:
1186 spin_unlock_irqrestore(&qp->orq_lock, flags);
1187
1188 if (resume_tx)
1189 rv = siw_sq_start(qp);
1190
1191 return rv;
1192 }
1193
1194 /*
1195 * siw_rdmap_complete()
1196 *
1197 * Complete processing of an RDMA message after receiving all
1198 * DDP segmens or ABort processing after encountering error case.
1199 *
1200 * o SENDs + RRESPs will need for completion,
1201 * o RREQs need for READ RESPONSE initialization
1202 * o WRITEs need memory dereferencing
1203 *
1204 * TODO: Failed WRITEs need local error to be surfaced.
1205 */
1206 static int siw_rdmap_complete(struct siw_qp *qp, int error)
1207 {
1208 struct siw_rx_stream *srx = &qp->rx_stream;
1209 struct siw_wqe *wqe = rx_wqe(qp->rx_fpdu);
1210 enum siw_wc_status wc_status = wqe->wc_status;
1211 u8 opcode = __rdmap_get_opcode(&srx->hdr.ctrl);
1212 int rv = 0;
1213
1214 switch (opcode) {
1215 case RDMAP_SEND_SE:
1216 case RDMAP_SEND_SE_INVAL:
1217 wqe->rqe.flags |= SIW_WQE_SOLICITED;
1218 fallthrough;
1219
1220 case RDMAP_SEND:
1221 case RDMAP_SEND_INVAL:
1222 if (wqe->wr_status == SIW_WR_IDLE)
1223 break;
1224
1225 srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]++;
1226
1227 if (error != 0 && wc_status == SIW_WC_SUCCESS)
1228 wc_status = SIW_WC_GENERAL_ERR;
1229 /*
1230 * Handle STag invalidation request
1231 */
1232 if (wc_status == SIW_WC_SUCCESS &&
1233 (opcode == RDMAP_SEND_INVAL ||
1234 opcode == RDMAP_SEND_SE_INVAL)) {
1235 rv = siw_invalidate_stag(qp->pd, srx->inval_stag);
1236 if (rv) {
1237 siw_init_terminate(
1238 qp, TERM_ERROR_LAYER_RDMAP,
1239 rv == -EACCES ?
1240 RDMAP_ETYPE_REMOTE_PROTECTION :
1241 RDMAP_ETYPE_REMOTE_OPERATION,
1242 RDMAP_ECODE_CANNOT_INVALIDATE, 0);
1243
1244 wc_status = SIW_WC_REM_INV_REQ_ERR;
1245 }
1246 rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed,
1247 rv ? 0 : srx->inval_stag,
1248 wc_status);
1249 } else {
1250 rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed,
1251 0, wc_status);
1252 }
1253 siw_wqe_put_mem(wqe, SIW_OP_RECEIVE);
1254 break;
1255
1256 case RDMAP_RDMA_READ_RESP:
1257 if (wqe->wr_status == SIW_WR_IDLE)
1258 break;
1259
1260 if (error != 0) {
1261 if ((srx->state == SIW_GET_HDR &&
1262 qp->rx_fpdu->first_ddp_seg) || error == -ENODATA)
1263 /* possible RREQ in ORQ left untouched */
1264 break;
1265
1266 if (wc_status == SIW_WC_SUCCESS)
1267 wc_status = SIW_WC_GENERAL_ERR;
1268 } else if (rdma_is_kernel_res(&qp->base_qp.res) &&
1269 rx_type(wqe) == SIW_OP_READ_LOCAL_INV) {
1270 /*
1271 * Handle any STag invalidation request
1272 */
1273 rv = siw_invalidate_stag(qp->pd, wqe->sqe.sge[0].lkey);
1274 if (rv) {
1275 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
1276 RDMAP_ETYPE_CATASTROPHIC,
1277 RDMAP_ECODE_UNSPECIFIED, 0);
1278
1279 if (wc_status == SIW_WC_SUCCESS) {
1280 wc_status = SIW_WC_GENERAL_ERR;
1281 error = rv;
1282 }
1283 }
1284 }
1285 /*
1286 * All errors turn the wqe into signalled.
1287 */
1288 if ((wqe->sqe.flags & SIW_WQE_SIGNALLED) || error != 0)
1289 rv = siw_sqe_complete(qp, &wqe->sqe, wqe->processed,
1290 wc_status);
1291 siw_wqe_put_mem(wqe, SIW_OP_READ);
1292
1293 if (!error)
1294 rv = siw_check_tx_fence(qp);
1295 else
1296 /* Disable current ORQ eleement */
1297 WRITE_ONCE(orq_get_current(qp)->flags, 0);
1298 break;
1299
1300 case RDMAP_RDMA_READ_REQ:
1301 if (!error) {
1302 rv = siw_init_rresp(qp, srx);
1303 srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]++;
1304 }
1305 break;
1306
1307 case RDMAP_RDMA_WRITE:
1308 if (wqe->wr_status == SIW_WR_IDLE)
1309 break;
1310
1311 /*
1312 * Free References from memory object if
1313 * attached to receive context (inbound WRITE).
1314 * While a zero-length WRITE is allowed,
1315 * no memory reference got created.
1316 */
1317 if (rx_mem(&qp->rx_tagged)) {
1318 siw_mem_put(rx_mem(&qp->rx_tagged));
1319 rx_mem(&qp->rx_tagged) = NULL;
1320 }
1321 break;
1322
1323 default:
1324 break;
1325 }
1326 wqe->wr_status = SIW_WR_IDLE;
1327
1328 return rv;
1329 }
1330
1331 /*
1332 * siw_tcp_rx_data()
1333 *
1334 * Main routine to consume inbound TCP payload
1335 *
1336 * @rd_desc: read descriptor
1337 * @skb: socket buffer
1338 * @off: offset in skb
1339 * @len: skb->len - offset : payload in skb
1340 */
1341 int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb,
1342 unsigned int off, size_t len)
1343 {
1344 struct siw_qp *qp = rd_desc->arg.data;
1345 struct siw_rx_stream *srx = &qp->rx_stream;
1346 int rv;
1347
1348 srx->skb = skb;
1349 srx->skb_new = skb->len - off;
1350 srx->skb_offset = off;
1351 srx->skb_copied = 0;
1352
1353 siw_dbg_qp(qp, "new data, len %d\n", srx->skb_new);
1354
1355 while (srx->skb_new) {
1356 int run_completion = 1;
1357
1358 if (unlikely(srx->rx_suspend)) {
1359 /* Do not process any more data */
1360 srx->skb_copied += srx->skb_new;
1361 break;
1362 }
1363 switch (srx->state) {
1364 case SIW_GET_HDR:
1365 rv = siw_get_hdr(srx);
1366 if (!rv) {
1367 srx->fpdu_part_rem =
1368 be16_to_cpu(srx->hdr.ctrl.mpa_len) -
1369 srx->fpdu_part_rcvd + MPA_HDR_SIZE;
1370
1371 if (srx->fpdu_part_rem)
1372 srx->pad = -srx->fpdu_part_rem & 0x3;
1373 else
1374 srx->pad = 0;
1375
1376 srx->state = SIW_GET_DATA_START;
1377 srx->fpdu_part_rcvd = 0;
1378 }
1379 break;
1380
1381 case SIW_GET_DATA_MORE:
1382 /*
1383 * Another data fragment of the same DDP segment.
1384 * Setting first_ddp_seg = 0 avoids repeating
1385 * initializations that shall occur only once per
1386 * DDP segment.
1387 */
1388 qp->rx_fpdu->first_ddp_seg = 0;
1389 fallthrough;
1390
1391 case SIW_GET_DATA_START:
1392 /*
1393 * Headers will be checked by the opcode-specific
1394 * data receive function below.
1395 */
1396 rv = iwarp_pktinfo[qp->rx_stream.rdmap_op].rx_data(qp);
1397 if (!rv) {
1398 int mpa_len =
1399 be16_to_cpu(srx->hdr.ctrl.mpa_len)
1400 + MPA_HDR_SIZE;
1401
1402 srx->fpdu_part_rem = (-mpa_len & 0x3)
1403 + MPA_CRC_SIZE;
1404 srx->fpdu_part_rcvd = 0;
1405 srx->state = SIW_GET_TRAILER;
1406 } else {
1407 if (unlikely(rv == -ECONNRESET))
1408 run_completion = 0;
1409 else
1410 srx->state = SIW_GET_DATA_MORE;
1411 }
1412 break;
1413
1414 case SIW_GET_TRAILER:
1415 /*
1416 * read CRC + any padding
1417 */
1418 rv = siw_get_trailer(qp, srx);
1419 if (likely(!rv)) {
1420 /*
1421 * FPDU completed.
1422 * complete RDMAP message if last fragment
1423 */
1424 srx->state = SIW_GET_HDR;
1425 srx->fpdu_part_rcvd = 0;
1426
1427 if (!(srx->hdr.ctrl.ddp_rdmap_ctrl &
1428 DDP_FLAG_LAST))
1429 /* more frags */
1430 break;
1431
1432 rv = siw_rdmap_complete(qp, 0);
1433 run_completion = 0;
1434 }
1435 break;
1436
1437 default:
1438 pr_warn("QP[%u]: RX out of state\n", qp_id(qp));
1439 rv = -EPROTO;
1440 run_completion = 0;
1441 }
1442 if (unlikely(rv != 0 && rv != -EAGAIN)) {
1443 if ((srx->state > SIW_GET_HDR ||
1444 qp->rx_fpdu->more_ddp_segs) && run_completion)
1445 siw_rdmap_complete(qp, rv);
1446
1447 siw_dbg_qp(qp, "rx error %d, rx state %d\n", rv,
1448 srx->state);
1449
1450 siw_qp_cm_drop(qp, 1);
1451
1452 break;
1453 }
1454 if (rv) {
1455 siw_dbg_qp(qp, "fpdu fragment, state %d, missing %d\n",
1456 srx->state, srx->fpdu_part_rem);
1457 break;
1458 }
1459 }
1460 return srx->skb_copied;
1461 }
Linux with added FPC-III support