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 */
siw_rx_umem(struct siw_rx_stream * srx,struct siw_umem * umem,u64 dest_addr,int len)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: %p, %p\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 %p, 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_enabled) {
71 if (rdma_is_kernel_res(&rx_qp(srx)->base_qp.res)) {
72 siw_crc_update(&srx->mpa_crc, dest + pg_off,
73 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
siw_rx_kva(struct siw_rx_stream * srx,void * kva,int len)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%p, 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%p, rv %d\n",
113 qp_id(rx_qp(srx)), __func__, len, kva, rv);
114
115 return rv;
116 }
117 if (srx->mpa_crc_enabled)
118 siw_crc_update(&srx->mpa_crc, kva, len);
119
120 srx->skb_offset += len;
121 srx->skb_copied += len;
122 srx->skb_new -= len;
123
124 return len;
125 }
126
siw_rx_pbl(struct siw_rx_stream * srx,int * pbl_idx,struct siw_mem * mem,u64 addr,int len)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, ib_virt_dma_to_ptr(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 */
siw_rresp_check_ntoh(struct siw_rx_stream * srx,struct siw_rx_fpdu * frx)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 */
siw_write_check_ntoh(struct siw_rx_stream * srx,struct siw_rx_fpdu * frx)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 */
siw_send_check_ntoh(struct siw_rx_stream * srx,struct siw_rx_fpdu * frx)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
siw_rqe_get(struct siw_qp * qp)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
siw_rx_data(struct siw_mem * mem_p,struct siw_rx_stream * srx,unsigned int * pbl_idx,u64 addr,int bytes)408 static int siw_rx_data(struct siw_mem *mem_p, struct siw_rx_stream *srx,
409 unsigned int *pbl_idx, u64 addr, int bytes)
410 {
411 int rv;
412
413 if (mem_p->mem_obj == NULL)
414 rv = siw_rx_kva(srx, ib_virt_dma_to_ptr(addr), bytes);
415 else if (!mem_p->is_pbl)
416 rv = siw_rx_umem(srx, mem_p->umem, addr, bytes);
417 else
418 rv = siw_rx_pbl(srx, pbl_idx, mem_p, addr, bytes);
419 return rv;
420 }
421
422 /*
423 * siw_proc_send:
424 *
425 * Process one incoming SEND and place data into memory referenced by
426 * receive wqe.
427 *
428 * Function supports partially received sends (suspending/resuming
429 * current receive wqe processing)
430 *
431 * return value:
432 * 0: reached the end of a DDP segment
433 * -EAGAIN: to be called again to finish the DDP segment
434 */
siw_proc_send(struct siw_qp * qp)435 int siw_proc_send(struct siw_qp *qp)
436 {
437 struct siw_rx_stream *srx = &qp->rx_stream;
438 struct siw_rx_fpdu *frx = &qp->rx_untagged;
439 struct siw_wqe *wqe;
440 u32 data_bytes; /* all data bytes available */
441 u32 rcvd_bytes; /* sum of data bytes rcvd */
442 int rv = 0;
443
444 if (frx->first_ddp_seg) {
445 wqe = siw_rqe_get(qp);
446 if (unlikely(!wqe)) {
447 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
448 DDP_ETYPE_UNTAGGED_BUF,
449 DDP_ECODE_UT_INVALID_MSN_NOBUF, 0);
450 return -ENOENT;
451 }
452 } else {
453 wqe = rx_wqe(frx);
454 }
455 if (srx->state == SIW_GET_DATA_START) {
456 rv = siw_send_check_ntoh(srx, frx);
457 if (unlikely(rv)) {
458 siw_qp_event(qp, IB_EVENT_QP_FATAL);
459 return rv;
460 }
461 if (!srx->fpdu_part_rem) /* zero length SEND */
462 return 0;
463 }
464 data_bytes = min(srx->fpdu_part_rem, srx->skb_new);
465 rcvd_bytes = 0;
466
467 /* A zero length SEND will skip below loop */
468 while (data_bytes) {
469 struct ib_pd *pd;
470 struct siw_mem **mem, *mem_p;
471 struct siw_sge *sge;
472 u32 sge_bytes; /* data bytes avail for SGE */
473
474 sge = &wqe->rqe.sge[frx->sge_idx];
475
476 if (!sge->length) {
477 /* just skip empty sge's */
478 frx->sge_idx++;
479 frx->sge_off = 0;
480 frx->pbl_idx = 0;
481 continue;
482 }
483 sge_bytes = min(data_bytes, sge->length - frx->sge_off);
484 mem = &wqe->mem[frx->sge_idx];
485
486 /*
487 * check with QP's PD if no SRQ present, SRQ's PD otherwise
488 */
489 pd = qp->srq == NULL ? qp->pd : qp->srq->base_srq.pd;
490
491 rv = siw_check_sge(pd, sge, mem, IB_ACCESS_LOCAL_WRITE,
492 frx->sge_off, sge_bytes);
493 if (unlikely(rv)) {
494 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
495 DDP_ETYPE_CATASTROPHIC,
496 DDP_ECODE_CATASTROPHIC, 0);
497
498 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
499 break;
500 }
501 mem_p = *mem;
502 rv = siw_rx_data(mem_p, srx, &frx->pbl_idx,
503 sge->laddr + frx->sge_off, sge_bytes);
504 if (unlikely(rv != sge_bytes)) {
505 wqe->processed += rcvd_bytes;
506
507 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
508 DDP_ETYPE_CATASTROPHIC,
509 DDP_ECODE_CATASTROPHIC, 0);
510 return -EINVAL;
511 }
512 frx->sge_off += rv;
513
514 if (frx->sge_off == sge->length) {
515 frx->sge_idx++;
516 frx->sge_off = 0;
517 frx->pbl_idx = 0;
518 }
519 data_bytes -= rv;
520 rcvd_bytes += rv;
521
522 srx->fpdu_part_rem -= rv;
523 srx->fpdu_part_rcvd += rv;
524 }
525 wqe->processed += rcvd_bytes;
526
527 if (!srx->fpdu_part_rem)
528 return 0;
529
530 return (rv < 0) ? rv : -EAGAIN;
531 }
532
533 /*
534 * siw_proc_write:
535 *
536 * Place incoming WRITE after referencing and checking target buffer
537
538 * Function supports partially received WRITEs (suspending/resuming
539 * current receive processing)
540 *
541 * return value:
542 * 0: reached the end of a DDP segment
543 * -EAGAIN: to be called again to finish the DDP segment
544 */
siw_proc_write(struct siw_qp * qp)545 int siw_proc_write(struct siw_qp *qp)
546 {
547 struct siw_rx_stream *srx = &qp->rx_stream;
548 struct siw_rx_fpdu *frx = &qp->rx_tagged;
549 struct siw_mem *mem;
550 int bytes, rv;
551
552 if (srx->state == SIW_GET_DATA_START) {
553 if (!srx->fpdu_part_rem) /* zero length WRITE */
554 return 0;
555
556 rv = siw_write_check_ntoh(srx, frx);
557 if (unlikely(rv)) {
558 siw_qp_event(qp, IB_EVENT_QP_FATAL);
559 return rv;
560 }
561 }
562 bytes = min(srx->fpdu_part_rem, srx->skb_new);
563
564 if (frx->first_ddp_seg) {
565 struct siw_wqe *wqe = rx_wqe(frx);
566
567 rx_mem(frx) = siw_mem_id2obj(qp->sdev, srx->ddp_stag >> 8);
568 if (unlikely(!rx_mem(frx))) {
569 siw_dbg_qp(qp,
570 "sink stag not found/invalid, stag 0x%08x\n",
571 srx->ddp_stag);
572
573 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
574 DDP_ETYPE_TAGGED_BUF,
575 DDP_ECODE_T_INVALID_STAG, 0);
576 return -EINVAL;
577 }
578 wqe->rqe.num_sge = 1;
579 rx_type(wqe) = SIW_OP_WRITE;
580 wqe->wr_status = SIW_WR_INPROGRESS;
581 }
582 mem = rx_mem(frx);
583
584 /*
585 * Check if application re-registered memory with different
586 * key field of STag.
587 */
588 if (unlikely(mem->stag != srx->ddp_stag)) {
589 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
590 DDP_ETYPE_TAGGED_BUF,
591 DDP_ECODE_T_INVALID_STAG, 0);
592 return -EINVAL;
593 }
594 rv = siw_check_mem(qp->pd, mem, srx->ddp_to + srx->fpdu_part_rcvd,
595 IB_ACCESS_REMOTE_WRITE, bytes);
596 if (unlikely(rv)) {
597 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
598 DDP_ETYPE_TAGGED_BUF, siw_tagged_error(-rv),
599 0);
600
601 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
602
603 return -EINVAL;
604 }
605
606 rv = siw_rx_data(mem, srx, &frx->pbl_idx,
607 srx->ddp_to + srx->fpdu_part_rcvd, bytes);
608 if (unlikely(rv != bytes)) {
609 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
610 DDP_ETYPE_CATASTROPHIC,
611 DDP_ECODE_CATASTROPHIC, 0);
612 return -EINVAL;
613 }
614 srx->fpdu_part_rem -= rv;
615 srx->fpdu_part_rcvd += rv;
616
617 if (!srx->fpdu_part_rem) {
618 srx->ddp_to += srx->fpdu_part_rcvd;
619 return 0;
620 }
621 return -EAGAIN;
622 }
623
624 /*
625 * Inbound RREQ's cannot carry user data.
626 */
siw_proc_rreq(struct siw_qp * qp)627 int siw_proc_rreq(struct siw_qp *qp)
628 {
629 struct siw_rx_stream *srx = &qp->rx_stream;
630
631 if (!srx->fpdu_part_rem)
632 return 0;
633
634 pr_warn("siw: [QP %u]: rreq with mpa len %d\n", qp_id(qp),
635 be16_to_cpu(srx->hdr.ctrl.mpa_len));
636
637 return -EPROTO;
638 }
639
640 /*
641 * siw_init_rresp:
642 *
643 * Process inbound RDMA READ REQ. Produce a pseudo READ RESPONSE WQE.
644 * Put it at the tail of the IRQ, if there is another WQE currently in
645 * transmit processing. If not, make it the current WQE to be processed
646 * and schedule transmit processing.
647 *
648 * Can be called from softirq context and from process
649 * context (RREAD socket loopback case!)
650 *
651 * return value:
652 * 0: success,
653 * failure code otherwise
654 */
655
siw_init_rresp(struct siw_qp * qp,struct siw_rx_stream * srx)656 static int siw_init_rresp(struct siw_qp *qp, struct siw_rx_stream *srx)
657 {
658 struct siw_wqe *tx_work = tx_wqe(qp);
659 struct siw_sqe *resp;
660
661 uint64_t raddr = be64_to_cpu(srx->hdr.rreq.sink_to),
662 laddr = be64_to_cpu(srx->hdr.rreq.source_to);
663 uint32_t length = be32_to_cpu(srx->hdr.rreq.read_size),
664 lkey = be32_to_cpu(srx->hdr.rreq.source_stag),
665 rkey = be32_to_cpu(srx->hdr.rreq.sink_stag),
666 msn = be32_to_cpu(srx->hdr.rreq.ddp_msn);
667
668 int run_sq = 1, rv = 0;
669 unsigned long flags;
670
671 if (unlikely(msn != srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ])) {
672 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
673 DDP_ETYPE_UNTAGGED_BUF,
674 DDP_ECODE_UT_INVALID_MSN_RANGE, 0);
675 return -EPROTO;
676 }
677 spin_lock_irqsave(&qp->sq_lock, flags);
678
679 if (unlikely(!qp->attrs.irq_size)) {
680 run_sq = 0;
681 goto error_irq;
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 error_irq:
716 pr_warn("siw: [QP %u]: IRQ exceeded or null, size %d\n",
717 qp_id(qp), qp->attrs.irq_size);
718
719 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
720 RDMAP_ETYPE_REMOTE_OPERATION,
721 RDMAP_ECODE_CATASTROPHIC_STREAM, 0);
722 rv = -EPROTO;
723 }
724
725 spin_unlock_irqrestore(&qp->sq_lock, flags);
726
727 if (run_sq)
728 rv = siw_sq_start(qp);
729
730 return rv;
731 }
732
733 /*
734 * Only called at start of Read.Resonse processing.
735 * Transfer pending Read from tip of ORQ into currrent rx wqe,
736 * but keep ORQ entry valid until Read.Response processing done.
737 * No Queue locking needed.
738 */
siw_orqe_start_rx(struct siw_qp * qp)739 static int siw_orqe_start_rx(struct siw_qp *qp)
740 {
741 struct siw_sqe *orqe;
742 struct siw_wqe *wqe = NULL;
743
744 if (unlikely(!qp->attrs.orq_size))
745 return -EPROTO;
746
747 /* make sure ORQ indices are current */
748 smp_mb();
749
750 orqe = orq_get_current(qp);
751 if (READ_ONCE(orqe->flags) & SIW_WQE_VALID) {
752 /* RRESP is a TAGGED RDMAP operation */
753 wqe = rx_wqe(&qp->rx_tagged);
754 wqe->sqe.id = orqe->id;
755 wqe->sqe.opcode = orqe->opcode;
756 wqe->sqe.sge[0].laddr = orqe->sge[0].laddr;
757 wqe->sqe.sge[0].lkey = orqe->sge[0].lkey;
758 wqe->sqe.sge[0].length = orqe->sge[0].length;
759 wqe->sqe.flags = orqe->flags;
760 wqe->sqe.num_sge = 1;
761 wqe->bytes = orqe->sge[0].length;
762 wqe->processed = 0;
763 wqe->mem[0] = NULL;
764 /* make sure WQE is completely written before valid */
765 smp_wmb();
766 wqe->wr_status = SIW_WR_INPROGRESS;
767
768 return 0;
769 }
770 return -EPROTO;
771 }
772
773 /*
774 * siw_proc_rresp:
775 *
776 * Place incoming RRESP data into memory referenced by RREQ WQE
777 * which is at the tip of the ORQ
778 *
779 * Function supports partially received RRESP's (suspending/resuming
780 * current receive processing)
781 */
siw_proc_rresp(struct siw_qp * qp)782 int siw_proc_rresp(struct siw_qp *qp)
783 {
784 struct siw_rx_stream *srx = &qp->rx_stream;
785 struct siw_rx_fpdu *frx = &qp->rx_tagged;
786 struct siw_wqe *wqe = rx_wqe(frx);
787 struct siw_mem **mem, *mem_p;
788 struct siw_sge *sge;
789 int bytes, rv;
790
791 if (frx->first_ddp_seg) {
792 if (unlikely(wqe->wr_status != SIW_WR_IDLE)) {
793 pr_warn("siw: [QP %u]: proc RRESP: status %d, op %d\n",
794 qp_id(qp), wqe->wr_status, wqe->sqe.opcode);
795 rv = -EPROTO;
796 goto error_term;
797 }
798 /*
799 * fetch pending RREQ from orq
800 */
801 rv = siw_orqe_start_rx(qp);
802 if (rv) {
803 pr_warn("siw: [QP %u]: ORQ empty, size %d\n",
804 qp_id(qp), qp->attrs.orq_size);
805 goto error_term;
806 }
807 rv = siw_rresp_check_ntoh(srx, frx);
808 if (unlikely(rv)) {
809 siw_qp_event(qp, IB_EVENT_QP_FATAL);
810 return rv;
811 }
812 } else {
813 if (unlikely(wqe->wr_status != SIW_WR_INPROGRESS)) {
814 pr_warn("siw: [QP %u]: resume RRESP: status %d\n",
815 qp_id(qp), wqe->wr_status);
816 rv = -EPROTO;
817 goto error_term;
818 }
819 }
820 if (!srx->fpdu_part_rem) /* zero length RRESPONSE */
821 return 0;
822
823 sge = wqe->sqe.sge; /* there is only one */
824 mem = &wqe->mem[0];
825
826 if (!(*mem)) {
827 /*
828 * check target memory which resolves memory on first fragment
829 */
830 rv = siw_check_sge(qp->pd, sge, mem, IB_ACCESS_LOCAL_WRITE, 0,
831 wqe->bytes);
832 if (unlikely(rv)) {
833 siw_dbg_qp(qp, "target mem check: %d\n", rv);
834 wqe->wc_status = SIW_WC_LOC_PROT_ERR;
835
836 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP,
837 DDP_ETYPE_TAGGED_BUF,
838 siw_tagged_error(-rv), 0);
839
840 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR);
841
842 return -EINVAL;
843 }
844 }
845 mem_p = *mem;
846
847 bytes = min(srx->fpdu_part_rem, srx->skb_new);
848 rv = siw_rx_data(mem_p, srx, &frx->pbl_idx,
849 sge->laddr + wqe->processed, bytes);
850 if (rv != bytes) {
851 wqe->wc_status = SIW_WC_GENERAL_ERR;
852 rv = -EINVAL;
853 goto error_term;
854 }
855 srx->fpdu_part_rem -= rv;
856 srx->fpdu_part_rcvd += rv;
857 wqe->processed += rv;
858
859 if (!srx->fpdu_part_rem) {
860 srx->ddp_to += srx->fpdu_part_rcvd;
861 return 0;
862 }
863 return -EAGAIN;
864
865 error_term:
866 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, DDP_ETYPE_CATASTROPHIC,
867 DDP_ECODE_CATASTROPHIC, 0);
868 return rv;
869 }
870
siw_update_skb_rcvd(struct siw_rx_stream * srx,u16 length)871 static void siw_update_skb_rcvd(struct siw_rx_stream *srx, u16 length)
872 {
873 srx->skb_offset += length;
874 srx->skb_new -= length;
875 srx->skb_copied += length;
876 }
877
siw_proc_terminate(struct siw_qp * qp)878 int siw_proc_terminate(struct siw_qp *qp)
879 {
880 struct siw_rx_stream *srx = &qp->rx_stream;
881 struct sk_buff *skb = srx->skb;
882 struct iwarp_terminate *term = &srx->hdr.terminate;
883 union iwarp_hdr term_info;
884 u8 *infop = (u8 *)&term_info;
885 enum rdma_opcode op;
886 u16 to_copy = sizeof(struct iwarp_ctrl);
887
888 pr_warn("siw: got TERMINATE. layer %d, type %d, code %d\n",
889 __rdmap_term_layer(term), __rdmap_term_etype(term),
890 __rdmap_term_ecode(term));
891
892 if (be32_to_cpu(term->ddp_qn) != RDMAP_UNTAGGED_QN_TERMINATE ||
893 be32_to_cpu(term->ddp_msn) !=
894 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] ||
895 be32_to_cpu(term->ddp_mo) != 0) {
896 pr_warn("siw: rx bogus TERM [QN x%08x, MSN x%08x, MO x%08x]\n",
897 be32_to_cpu(term->ddp_qn), be32_to_cpu(term->ddp_msn),
898 be32_to_cpu(term->ddp_mo));
899 return -ECONNRESET;
900 }
901 /*
902 * Receive remaining pieces of TERM if indicated
903 */
904 if (!term->flag_m)
905 return -ECONNRESET;
906
907 /* Do not take the effort to reassemble a network fragmented
908 * TERM message
909 */
910 if (srx->skb_new < sizeof(struct iwarp_ctrl_tagged))
911 return -ECONNRESET;
912
913 memset(infop, 0, sizeof(term_info));
914
915 skb_copy_bits(skb, srx->skb_offset, infop, to_copy);
916
917 op = __rdmap_get_opcode(&term_info.ctrl);
918 if (op >= RDMAP_TERMINATE)
919 goto out;
920
921 infop += to_copy;
922 siw_update_skb_rcvd(srx, 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 siw_update_skb_rcvd(srx, to_copy);
945 srx->fpdu_part_rcvd += to_copy;
946 srx->fpdu_part_rem -= to_copy;
947
948 return -ECONNRESET;
949 }
950
siw_get_trailer(struct siw_qp * qp,struct siw_rx_stream * srx)951 static int siw_get_trailer(struct siw_qp *qp, struct siw_rx_stream *srx)
952 {
953 struct sk_buff *skb = srx->skb;
954 int avail = min(srx->skb_new, srx->fpdu_part_rem);
955 u8 *tbuf = (u8 *)&srx->trailer.crc - srx->pad;
956 __wsum crc_in, crc_own = 0;
957
958 siw_dbg_qp(qp, "expected %d, available %d, pad %u\n",
959 srx->fpdu_part_rem, srx->skb_new, srx->pad);
960
961 skb_copy_bits(skb, srx->skb_offset, tbuf, avail);
962
963 siw_update_skb_rcvd(srx, avail);
964 srx->fpdu_part_rem -= avail;
965
966 if (srx->fpdu_part_rem)
967 return -EAGAIN;
968
969 if (!srx->mpa_crc_enabled)
970 return 0;
971
972 if (srx->pad)
973 siw_crc_update(&srx->mpa_crc, tbuf, srx->pad);
974 /*
975 * CRC32 is computed, transmitted and received directly in NBO,
976 * so there's never a reason to convert byte order.
977 */
978 siw_crc_final(&srx->mpa_crc, (u8 *)&crc_own);
979 crc_in = (__force __wsum)srx->trailer.crc;
980
981 if (unlikely(crc_in != crc_own)) {
982 pr_warn("siw: crc error. in: %08x, own %08x, op %u\n",
983 crc_in, crc_own, qp->rx_stream.rdmap_op);
984
985 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
986 LLP_ETYPE_MPA,
987 LLP_ECODE_RECEIVED_CRC, 0);
988 return -EINVAL;
989 }
990 return 0;
991 }
992
993 #define MIN_DDP_HDR sizeof(struct iwarp_ctrl_tagged)
994
siw_get_hdr(struct siw_rx_stream * srx)995 static int siw_get_hdr(struct siw_rx_stream *srx)
996 {
997 struct sk_buff *skb = srx->skb;
998 struct siw_qp *qp = rx_qp(srx);
999 struct iwarp_ctrl *c_hdr = &srx->hdr.ctrl;
1000 struct siw_rx_fpdu *frx;
1001 u8 opcode;
1002 int bytes;
1003
1004 if (srx->fpdu_part_rcvd < MIN_DDP_HDR) {
1005 /*
1006 * copy a mimimum sized (tagged) DDP frame control part
1007 */
1008 bytes = min_t(int, srx->skb_new,
1009 MIN_DDP_HDR - srx->fpdu_part_rcvd);
1010
1011 skb_copy_bits(skb, srx->skb_offset,
1012 (char *)c_hdr + srx->fpdu_part_rcvd, bytes);
1013
1014 siw_update_skb_rcvd(srx, bytes);
1015 srx->fpdu_part_rcvd += bytes;
1016 if (srx->fpdu_part_rcvd < MIN_DDP_HDR)
1017 return -EAGAIN;
1018
1019 if (unlikely(__ddp_get_version(c_hdr) != DDP_VERSION)) {
1020 enum ddp_etype etype;
1021 enum ddp_ecode ecode;
1022
1023 pr_warn("siw: received ddp version unsupported %d\n",
1024 __ddp_get_version(c_hdr));
1025
1026 if (c_hdr->ddp_rdmap_ctrl & DDP_FLAG_TAGGED) {
1027 etype = DDP_ETYPE_TAGGED_BUF;
1028 ecode = DDP_ECODE_T_VERSION;
1029 } else {
1030 etype = DDP_ETYPE_UNTAGGED_BUF;
1031 ecode = DDP_ECODE_UT_VERSION;
1032 }
1033 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP,
1034 etype, ecode, 0);
1035 return -EINVAL;
1036 }
1037 if (unlikely(__rdmap_get_version(c_hdr) != RDMAP_VERSION)) {
1038 pr_warn("siw: received rdmap version unsupported %d\n",
1039 __rdmap_get_version(c_hdr));
1040
1041 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP,
1042 RDMAP_ETYPE_REMOTE_OPERATION,
1043 RDMAP_ECODE_VERSION, 0);
1044 return -EINVAL;
1045 }
1046 opcode = __rdmap_get_opcode(c_hdr);
1047
1048 if (opcode > RDMAP_TERMINATE) {
1049 pr_warn("siw: received unknown packet type %u\n",
1050 opcode);
1051
1052 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP,
1053 RDMAP_ETYPE_REMOTE_OPERATION,
1054 RDMAP_ECODE_OPCODE, 0);
1055 return -EINVAL;
1056 }
1057 siw_dbg_qp(rx_qp(srx), "new header, opcode %u\n", opcode);
1058 } else {
1059 opcode = __rdmap_get_opcode(c_hdr);
1060 }
1061 set_rx_fpdu_context(qp, opcode);
1062 frx = qp->rx_fpdu;
1063
1064 /*
1065 * Figure out len of current hdr: variable length of
1066 * iwarp hdr may force us to copy hdr information in
1067 * two steps. Only tagged DDP messages are already
1068 * completely received.
1069 */
1070 if (iwarp_pktinfo[opcode].hdr_len > sizeof(struct iwarp_ctrl_tagged)) {
1071 int hdrlen = iwarp_pktinfo[opcode].hdr_len;
1072
1073 bytes = min_t(int, hdrlen - MIN_DDP_HDR, srx->skb_new);
1074
1075 skb_copy_bits(skb, srx->skb_offset,
1076 (char *)c_hdr + srx->fpdu_part_rcvd, bytes);
1077
1078 siw_update_skb_rcvd(srx, bytes);
1079 srx->fpdu_part_rcvd += bytes;
1080 if (srx->fpdu_part_rcvd < hdrlen)
1081 return -EAGAIN;
1082 }
1083
1084 /*
1085 * DDP/RDMAP header receive completed. Check if the current
1086 * DDP segment starts a new RDMAP message or continues a previously
1087 * started RDMAP message.
1088 *
1089 * Alternating reception of DDP segments (or FPDUs) from incomplete
1090 * tagged and untagged RDMAP messages is supported, as long as
1091 * the current tagged or untagged message gets eventually completed
1092 * w/o intersection from another message of the same type
1093 * (tagged/untagged). E.g., a WRITE can get intersected by a SEND,
1094 * but not by a READ RESPONSE etc.
1095 */
1096 if (srx->mpa_crc_enabled) {
1097 /*
1098 * Restart CRC computation
1099 */
1100 siw_crc_init(&srx->mpa_crc);
1101 siw_crc_update(&srx->mpa_crc, c_hdr, srx->fpdu_part_rcvd);
1102 }
1103 if (frx->more_ddp_segs) {
1104 frx->first_ddp_seg = 0;
1105 if (frx->prev_rdmap_op != opcode) {
1106 pr_warn("siw: packet intersection: %u : %u\n",
1107 frx->prev_rdmap_op, opcode);
1108 /*
1109 * The last inbound RDMA operation of same type
1110 * (tagged or untagged) is left unfinished.
1111 * To complete it in error, make it the current
1112 * operation again, even with the header already
1113 * overwritten. For error handling, only the opcode
1114 * and current rx context are relevant.
1115 */
1116 set_rx_fpdu_context(qp, frx->prev_rdmap_op);
1117 __rdmap_set_opcode(c_hdr, frx->prev_rdmap_op);
1118 return -EPROTO;
1119 }
1120 } else {
1121 frx->prev_rdmap_op = opcode;
1122 frx->first_ddp_seg = 1;
1123 }
1124 frx->more_ddp_segs = c_hdr->ddp_rdmap_ctrl & DDP_FLAG_LAST ? 0 : 1;
1125
1126 return 0;
1127 }
1128
siw_check_tx_fence(struct siw_qp * qp)1129 static int siw_check_tx_fence(struct siw_qp *qp)
1130 {
1131 struct siw_wqe *tx_waiting = tx_wqe(qp);
1132 struct siw_sqe *rreq;
1133 int resume_tx = 0, rv = 0;
1134 unsigned long flags;
1135
1136 spin_lock_irqsave(&qp->orq_lock, flags);
1137
1138 /* free current orq entry */
1139 rreq = orq_get_current(qp);
1140 WRITE_ONCE(rreq->flags, 0);
1141
1142 qp->orq_get++;
1143
1144 if (qp->tx_ctx.orq_fence) {
1145 if (unlikely(tx_waiting->wr_status != SIW_WR_QUEUED)) {
1146 pr_warn("siw: [QP %u]: fence resume: bad status %d\n",
1147 qp_id(qp), tx_waiting->wr_status);
1148 rv = -EPROTO;
1149 goto out;
1150 }
1151 /* resume SQ processing, if possible */
1152 if (tx_waiting->sqe.opcode == SIW_OP_READ ||
1153 tx_waiting->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
1154
1155 /* SQ processing was stopped because of a full ORQ */
1156 rreq = orq_get_free(qp);
1157 if (unlikely(!rreq)) {
1158 pr_warn("siw: [QP %u]: no ORQE\n", qp_id(qp));
1159 rv = -EPROTO;
1160 goto out;
1161 }
1162 siw_read_to_orq(rreq, &tx_waiting->sqe);
1163
1164 qp->orq_put++;
1165 qp->tx_ctx.orq_fence = 0;
1166 resume_tx = 1;
1167
1168 } else if (siw_orq_empty(qp)) {
1169 /*
1170 * SQ processing was stopped by fenced work request.
1171 * Resume since all previous Read's are now completed.
1172 */
1173 qp->tx_ctx.orq_fence = 0;
1174 resume_tx = 1;
1175 }
1176 }
1177 out:
1178 spin_unlock_irqrestore(&qp->orq_lock, flags);
1179
1180 if (resume_tx)
1181 rv = siw_sq_start(qp);
1182
1183 return rv;
1184 }
1185
1186 /*
1187 * siw_rdmap_complete()
1188 *
1189 * Complete processing of an RDMA message after receiving all
1190 * DDP segmens or ABort processing after encountering error case.
1191 *
1192 * o SENDs + RRESPs will need for completion,
1193 * o RREQs need for READ RESPONSE initialization
1194 * o WRITEs need memory dereferencing
1195 *
1196 * TODO: Failed WRITEs need local error to be surfaced.
1197 */
siw_rdmap_complete(struct siw_qp * qp,int error)1198 static int siw_rdmap_complete(struct siw_qp *qp, int error)
1199 {
1200 struct siw_rx_stream *srx = &qp->rx_stream;
1201 struct siw_wqe *wqe = rx_wqe(qp->rx_fpdu);
1202 enum siw_wc_status wc_status = wqe->wc_status;
1203 u8 opcode = __rdmap_get_opcode(&srx->hdr.ctrl);
1204 int rv = 0;
1205
1206 switch (opcode) {
1207 case RDMAP_SEND_SE:
1208 case RDMAP_SEND_SE_INVAL:
1209 wqe->rqe.flags |= SIW_WQE_SOLICITED;
1210 fallthrough;
1211
1212 case RDMAP_SEND:
1213 case RDMAP_SEND_INVAL:
1214 if (wqe->wr_status == SIW_WR_IDLE)
1215 break;
1216
1217 srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]++;
1218
1219 if (error != 0 && wc_status == SIW_WC_SUCCESS)
1220 wc_status = SIW_WC_GENERAL_ERR;
1221 /*
1222 * Handle STag invalidation request
1223 */
1224 if (wc_status == SIW_WC_SUCCESS &&
1225 (opcode == RDMAP_SEND_INVAL ||
1226 opcode == RDMAP_SEND_SE_INVAL)) {
1227 rv = siw_invalidate_stag(qp->pd, srx->inval_stag);
1228 if (rv) {
1229 siw_init_terminate(
1230 qp, TERM_ERROR_LAYER_RDMAP,
1231 rv == -EACCES ?
1232 RDMAP_ETYPE_REMOTE_PROTECTION :
1233 RDMAP_ETYPE_REMOTE_OPERATION,
1234 RDMAP_ECODE_CANNOT_INVALIDATE, 0);
1235
1236 wc_status = SIW_WC_REM_INV_REQ_ERR;
1237 }
1238 rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed,
1239 rv ? 0 : srx->inval_stag,
1240 wc_status);
1241 } else {
1242 rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed,
1243 0, wc_status);
1244 }
1245 siw_wqe_put_mem(wqe, SIW_OP_RECEIVE);
1246 break;
1247
1248 case RDMAP_RDMA_READ_RESP:
1249 if (wqe->wr_status == SIW_WR_IDLE)
1250 break;
1251
1252 if (error != 0) {
1253 if ((srx->state == SIW_GET_HDR &&
1254 qp->rx_fpdu->first_ddp_seg) || error == -ENODATA)
1255 /* possible RREQ in ORQ left untouched */
1256 break;
1257
1258 if (wc_status == SIW_WC_SUCCESS)
1259 wc_status = SIW_WC_GENERAL_ERR;
1260 } else if (rdma_is_kernel_res(&qp->base_qp.res) &&
1261 rx_type(wqe) == SIW_OP_READ_LOCAL_INV) {
1262 /*
1263 * Handle any STag invalidation request
1264 */
1265 rv = siw_invalidate_stag(qp->pd, wqe->sqe.sge[0].lkey);
1266 if (rv) {
1267 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
1268 RDMAP_ETYPE_CATASTROPHIC,
1269 RDMAP_ECODE_UNSPECIFIED, 0);
1270
1271 if (wc_status == SIW_WC_SUCCESS) {
1272 wc_status = SIW_WC_GENERAL_ERR;
1273 error = rv;
1274 }
1275 }
1276 }
1277 /*
1278 * All errors turn the wqe into signalled.
1279 */
1280 if ((wqe->sqe.flags & SIW_WQE_SIGNALLED) || error != 0)
1281 rv = siw_sqe_complete(qp, &wqe->sqe, wqe->processed,
1282 wc_status);
1283 siw_wqe_put_mem(wqe, SIW_OP_READ);
1284
1285 if (!error) {
1286 rv = siw_check_tx_fence(qp);
1287 } else {
1288 /* Disable current ORQ element */
1289 if (qp->attrs.orq_size)
1290 WRITE_ONCE(orq_get_current(qp)->flags, 0);
1291 }
1292 break;
1293
1294 case RDMAP_RDMA_READ_REQ:
1295 if (!error) {
1296 rv = siw_init_rresp(qp, srx);
1297 srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]++;
1298 }
1299 break;
1300
1301 case RDMAP_RDMA_WRITE:
1302 if (wqe->wr_status == SIW_WR_IDLE)
1303 break;
1304
1305 /*
1306 * Free References from memory object if
1307 * attached to receive context (inbound WRITE).
1308 * While a zero-length WRITE is allowed,
1309 * no memory reference got created.
1310 */
1311 if (rx_mem(&qp->rx_tagged)) {
1312 siw_mem_put(rx_mem(&qp->rx_tagged));
1313 rx_mem(&qp->rx_tagged) = NULL;
1314 }
1315 break;
1316
1317 default:
1318 break;
1319 }
1320 wqe->wr_status = SIW_WR_IDLE;
1321
1322 return rv;
1323 }
1324
1325 /*
1326 * siw_tcp_rx_data()
1327 *
1328 * Main routine to consume inbound TCP payload
1329 *
1330 * @rd_desc: read descriptor
1331 * @skb: socket buffer
1332 * @off: offset in skb
1333 * @len: skb->len - offset : payload in skb
1334 */
siw_tcp_rx_data(read_descriptor_t * rd_desc,struct sk_buff * skb,unsigned int off,size_t len)1335 int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb,
1336 unsigned int off, size_t len)
1337 {
1338 struct siw_qp *qp = rd_desc->arg.data;
1339 struct siw_rx_stream *srx = &qp->rx_stream;
1340 int rv;
1341
1342 srx->skb = skb;
1343 srx->skb_new = skb->len - off;
1344 srx->skb_offset = off;
1345 srx->skb_copied = 0;
1346
1347 siw_dbg_qp(qp, "new data, len %d\n", srx->skb_new);
1348
1349 while (srx->skb_new) {
1350 int run_completion = 1;
1351
1352 if (unlikely(srx->rx_suspend)) {
1353 /* Do not process any more data */
1354 srx->skb_copied += srx->skb_new;
1355 break;
1356 }
1357 switch (srx->state) {
1358 case SIW_GET_HDR:
1359 rv = siw_get_hdr(srx);
1360 if (!rv) {
1361 srx->fpdu_part_rem =
1362 be16_to_cpu(srx->hdr.ctrl.mpa_len) -
1363 srx->fpdu_part_rcvd + MPA_HDR_SIZE;
1364
1365 if (srx->fpdu_part_rem)
1366 srx->pad = -srx->fpdu_part_rem & 0x3;
1367 else
1368 srx->pad = 0;
1369
1370 srx->state = SIW_GET_DATA_START;
1371 srx->fpdu_part_rcvd = 0;
1372 }
1373 break;
1374
1375 case SIW_GET_DATA_MORE:
1376 /*
1377 * Another data fragment of the same DDP segment.
1378 * Setting first_ddp_seg = 0 avoids repeating
1379 * initializations that shall occur only once per
1380 * DDP segment.
1381 */
1382 qp->rx_fpdu->first_ddp_seg = 0;
1383 fallthrough;
1384
1385 case SIW_GET_DATA_START:
1386 /*
1387 * Headers will be checked by the opcode-specific
1388 * data receive function below.
1389 */
1390 rv = iwarp_pktinfo[qp->rx_stream.rdmap_op].rx_data(qp);
1391 if (!rv) {
1392 int mpa_len =
1393 be16_to_cpu(srx->hdr.ctrl.mpa_len)
1394 + MPA_HDR_SIZE;
1395
1396 srx->fpdu_part_rem = (-mpa_len & 0x3)
1397 + MPA_CRC_SIZE;
1398 srx->fpdu_part_rcvd = 0;
1399 srx->state = SIW_GET_TRAILER;
1400 } else {
1401 if (unlikely(rv == -ECONNRESET))
1402 run_completion = 0;
1403 else
1404 srx->state = SIW_GET_DATA_MORE;
1405 }
1406 break;
1407
1408 case SIW_GET_TRAILER:
1409 /*
1410 * read CRC + any padding
1411 */
1412 rv = siw_get_trailer(qp, srx);
1413 if (likely(!rv)) {
1414 /*
1415 * FPDU completed.
1416 * complete RDMAP message if last fragment
1417 */
1418 srx->state = SIW_GET_HDR;
1419 srx->fpdu_part_rcvd = 0;
1420
1421 if (!(srx->hdr.ctrl.ddp_rdmap_ctrl &
1422 DDP_FLAG_LAST))
1423 /* more frags */
1424 break;
1425
1426 rv = siw_rdmap_complete(qp, 0);
1427 run_completion = 0;
1428 }
1429 break;
1430
1431 default:
1432 pr_warn("QP[%u]: RX out of state\n", qp_id(qp));
1433 rv = -EPROTO;
1434 run_completion = 0;
1435 }
1436 if (unlikely(rv != 0 && rv != -EAGAIN)) {
1437 if ((srx->state > SIW_GET_HDR ||
1438 qp->rx_fpdu->more_ddp_segs) && run_completion)
1439 siw_rdmap_complete(qp, rv);
1440
1441 siw_dbg_qp(qp, "rx error %d, rx state %d\n", rv,
1442 srx->state);
1443
1444 siw_qp_cm_drop(qp, 1);
1445
1446 break;
1447 }
1448 if (rv) {
1449 siw_dbg_qp(qp, "fpdu fragment, state %d, missing %d\n",
1450 srx->state, srx->fpdu_part_rem);
1451 break;
1452 }
1453 }
1454 return srx->skb_copied;
1455 }
1456