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, 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 */ 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 ib_virt_dma_to_ptr(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 (unlikely(!qp->attrs.irq_size)) { 684 run_sq = 0; 685 goto error_irq; 686 } 687 if (tx_work->wr_status == SIW_WR_IDLE) { 688 /* 689 * immediately schedule READ response w/o 690 * consuming IRQ entry: IRQ must be empty. 691 */ 692 tx_work->processed = 0; 693 tx_work->mem[0] = NULL; 694 tx_work->wr_status = SIW_WR_QUEUED; 695 resp = &tx_work->sqe; 696 } else { 697 resp = irq_alloc_free(qp); 698 run_sq = 0; 699 } 700 if (likely(resp)) { 701 resp->opcode = SIW_OP_READ_RESPONSE; 702 703 resp->sge[0].length = length; 704 resp->sge[0].laddr = laddr; 705 resp->sge[0].lkey = lkey; 706 707 /* Keep aside message sequence number for potential 708 * error reporting during Read Response generation. 709 */ 710 resp->sge[1].length = msn; 711 712 resp->raddr = raddr; 713 resp->rkey = rkey; 714 resp->num_sge = length ? 1 : 0; 715 716 /* RRESP now valid as current TX wqe or placed into IRQ */ 717 smp_store_mb(resp->flags, SIW_WQE_VALID); 718 } else { 719 error_irq: 720 pr_warn("siw: [QP %u]: IRQ exceeded or null, size %d\n", 721 qp_id(qp), qp->attrs.irq_size); 722 723 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP, 724 RDMAP_ETYPE_REMOTE_OPERATION, 725 RDMAP_ECODE_CATASTROPHIC_STREAM, 0); 726 rv = -EPROTO; 727 } 728 729 spin_unlock_irqrestore(&qp->sq_lock, flags); 730 731 if (run_sq) 732 rv = siw_sq_start(qp); 733 734 return rv; 735 } 736 737 /* 738 * Only called at start of Read.Resonse processing. 739 * Transfer pending Read from tip of ORQ into currrent rx wqe, 740 * but keep ORQ entry valid until Read.Response processing done. 741 * No Queue locking needed. 742 */ 743 static int siw_orqe_start_rx(struct siw_qp *qp) 744 { 745 struct siw_sqe *orqe; 746 struct siw_wqe *wqe = NULL; 747 748 if (unlikely(!qp->attrs.orq_size)) 749 return -EPROTO; 750 751 /* make sure ORQ indices are current */ 752 smp_mb(); 753 754 orqe = orq_get_current(qp); 755 if (READ_ONCE(orqe->flags) & SIW_WQE_VALID) { 756 /* RRESP is a TAGGED RDMAP operation */ 757 wqe = rx_wqe(&qp->rx_tagged); 758 wqe->sqe.id = orqe->id; 759 wqe->sqe.opcode = orqe->opcode; 760 wqe->sqe.sge[0].laddr = orqe->sge[0].laddr; 761 wqe->sqe.sge[0].lkey = orqe->sge[0].lkey; 762 wqe->sqe.sge[0].length = orqe->sge[0].length; 763 wqe->sqe.flags = orqe->flags; 764 wqe->sqe.num_sge = 1; 765 wqe->bytes = orqe->sge[0].length; 766 wqe->processed = 0; 767 wqe->mem[0] = NULL; 768 /* make sure WQE is completely written before valid */ 769 smp_wmb(); 770 wqe->wr_status = SIW_WR_INPROGRESS; 771 772 return 0; 773 } 774 return -EPROTO; 775 } 776 777 /* 778 * siw_proc_rresp: 779 * 780 * Place incoming RRESP data into memory referenced by RREQ WQE 781 * which is at the tip of the ORQ 782 * 783 * Function supports partially received RRESP's (suspending/resuming 784 * current receive processing) 785 */ 786 int siw_proc_rresp(struct siw_qp *qp) 787 { 788 struct siw_rx_stream *srx = &qp->rx_stream; 789 struct siw_rx_fpdu *frx = &qp->rx_tagged; 790 struct siw_wqe *wqe = rx_wqe(frx); 791 struct siw_mem **mem, *mem_p; 792 struct siw_sge *sge; 793 int bytes, rv; 794 795 if (frx->first_ddp_seg) { 796 if (unlikely(wqe->wr_status != SIW_WR_IDLE)) { 797 pr_warn("siw: [QP %u]: proc RRESP: status %d, op %d\n", 798 qp_id(qp), wqe->wr_status, wqe->sqe.opcode); 799 rv = -EPROTO; 800 goto error_term; 801 } 802 /* 803 * fetch pending RREQ from orq 804 */ 805 rv = siw_orqe_start_rx(qp); 806 if (rv) { 807 pr_warn("siw: [QP %u]: ORQ empty, size %d\n", 808 qp_id(qp), qp->attrs.orq_size); 809 goto error_term; 810 } 811 rv = siw_rresp_check_ntoh(srx, frx); 812 if (unlikely(rv)) { 813 siw_qp_event(qp, IB_EVENT_QP_FATAL); 814 return rv; 815 } 816 } else { 817 if (unlikely(wqe->wr_status != SIW_WR_INPROGRESS)) { 818 pr_warn("siw: [QP %u]: resume RRESP: status %d\n", 819 qp_id(qp), wqe->wr_status); 820 rv = -EPROTO; 821 goto error_term; 822 } 823 } 824 if (!srx->fpdu_part_rem) /* zero length RRESPONSE */ 825 return 0; 826 827 sge = wqe->sqe.sge; /* there is only one */ 828 mem = &wqe->mem[0]; 829 830 if (!(*mem)) { 831 /* 832 * check target memory which resolves memory on first fragment 833 */ 834 rv = siw_check_sge(qp->pd, sge, mem, IB_ACCESS_LOCAL_WRITE, 0, 835 wqe->bytes); 836 if (unlikely(rv)) { 837 siw_dbg_qp(qp, "target mem check: %d\n", rv); 838 wqe->wc_status = SIW_WC_LOC_PROT_ERR; 839 840 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, 841 DDP_ETYPE_TAGGED_BUF, 842 siw_tagged_error(-rv), 0); 843 844 siw_qp_event(qp, IB_EVENT_QP_ACCESS_ERR); 845 846 return -EINVAL; 847 } 848 } 849 mem_p = *mem; 850 851 bytes = min(srx->fpdu_part_rem, srx->skb_new); 852 853 if (mem_p->mem_obj == NULL) 854 rv = siw_rx_kva(srx, 855 ib_virt_dma_to_ptr(sge->laddr + wqe->processed), 856 bytes); 857 else if (!mem_p->is_pbl) 858 rv = siw_rx_umem(srx, mem_p->umem, sge->laddr + wqe->processed, 859 bytes); 860 else 861 rv = siw_rx_pbl(srx, &frx->pbl_idx, mem_p, 862 sge->laddr + wqe->processed, bytes); 863 if (rv != bytes) { 864 wqe->wc_status = SIW_WC_GENERAL_ERR; 865 rv = -EINVAL; 866 goto error_term; 867 } 868 srx->fpdu_part_rem -= rv; 869 srx->fpdu_part_rcvd += rv; 870 wqe->processed += rv; 871 872 if (!srx->fpdu_part_rem) { 873 srx->ddp_to += srx->fpdu_part_rcvd; 874 return 0; 875 } 876 return -EAGAIN; 877 878 error_term: 879 siw_init_terminate(qp, TERM_ERROR_LAYER_DDP, DDP_ETYPE_CATASTROPHIC, 880 DDP_ECODE_CATASTROPHIC, 0); 881 return rv; 882 } 883 884 int siw_proc_terminate(struct siw_qp *qp) 885 { 886 struct siw_rx_stream *srx = &qp->rx_stream; 887 struct sk_buff *skb = srx->skb; 888 struct iwarp_terminate *term = &srx->hdr.terminate; 889 union iwarp_hdr term_info; 890 u8 *infop = (u8 *)&term_info; 891 enum rdma_opcode op; 892 u16 to_copy = sizeof(struct iwarp_ctrl); 893 894 pr_warn("siw: got TERMINATE. layer %d, type %d, code %d\n", 895 __rdmap_term_layer(term), __rdmap_term_etype(term), 896 __rdmap_term_ecode(term)); 897 898 if (be32_to_cpu(term->ddp_qn) != RDMAP_UNTAGGED_QN_TERMINATE || 899 be32_to_cpu(term->ddp_msn) != 900 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] || 901 be32_to_cpu(term->ddp_mo) != 0) { 902 pr_warn("siw: rx bogus TERM [QN x%08x, MSN x%08x, MO x%08x]\n", 903 be32_to_cpu(term->ddp_qn), be32_to_cpu(term->ddp_msn), 904 be32_to_cpu(term->ddp_mo)); 905 return -ECONNRESET; 906 } 907 /* 908 * Receive remaining pieces of TERM if indicated 909 */ 910 if (!term->flag_m) 911 return -ECONNRESET; 912 913 /* Do not take the effort to reassemble a network fragmented 914 * TERM message 915 */ 916 if (srx->skb_new < sizeof(struct iwarp_ctrl_tagged)) 917 return -ECONNRESET; 918 919 memset(infop, 0, sizeof(term_info)); 920 921 skb_copy_bits(skb, srx->skb_offset, infop, to_copy); 922 923 op = __rdmap_get_opcode(&term_info.ctrl); 924 if (op >= RDMAP_TERMINATE) 925 goto out; 926 927 infop += to_copy; 928 srx->skb_offset += to_copy; 929 srx->skb_new -= to_copy; 930 srx->skb_copied += to_copy; 931 srx->fpdu_part_rcvd += to_copy; 932 srx->fpdu_part_rem -= to_copy; 933 934 to_copy = iwarp_pktinfo[op].hdr_len - to_copy; 935 936 /* Again, no network fragmented TERM's */ 937 if (to_copy + MPA_CRC_SIZE > srx->skb_new) 938 return -ECONNRESET; 939 940 skb_copy_bits(skb, srx->skb_offset, infop, to_copy); 941 942 if (term->flag_r) { 943 siw_dbg_qp(qp, "TERM reports RDMAP hdr type %u, len %u (%s)\n", 944 op, be16_to_cpu(term_info.ctrl.mpa_len), 945 term->flag_m ? "valid" : "invalid"); 946 } else if (term->flag_d) { 947 siw_dbg_qp(qp, "TERM reports DDP hdr type %u, len %u (%s)\n", 948 op, be16_to_cpu(term_info.ctrl.mpa_len), 949 term->flag_m ? "valid" : "invalid"); 950 } 951 out: 952 srx->skb_new -= to_copy; 953 srx->skb_offset += to_copy; 954 srx->skb_copied += to_copy; 955 srx->fpdu_part_rcvd += to_copy; 956 srx->fpdu_part_rem -= to_copy; 957 958 return -ECONNRESET; 959 } 960 961 static int siw_get_trailer(struct siw_qp *qp, struct siw_rx_stream *srx) 962 { 963 struct sk_buff *skb = srx->skb; 964 int avail = min(srx->skb_new, srx->fpdu_part_rem); 965 u8 *tbuf = (u8 *)&srx->trailer.crc - srx->pad; 966 __wsum crc_in, crc_own = 0; 967 968 siw_dbg_qp(qp, "expected %d, available %d, pad %u\n", 969 srx->fpdu_part_rem, srx->skb_new, srx->pad); 970 971 skb_copy_bits(skb, srx->skb_offset, tbuf, avail); 972 973 srx->skb_new -= avail; 974 srx->skb_offset += avail; 975 srx->skb_copied += avail; 976 srx->fpdu_part_rem -= avail; 977 978 if (srx->fpdu_part_rem) 979 return -EAGAIN; 980 981 if (!srx->mpa_crc_hd) 982 return 0; 983 984 if (srx->pad) 985 crypto_shash_update(srx->mpa_crc_hd, tbuf, srx->pad); 986 /* 987 * CRC32 is computed, transmitted and received directly in NBO, 988 * so there's never a reason to convert byte order. 989 */ 990 crypto_shash_final(srx->mpa_crc_hd, (u8 *)&crc_own); 991 crc_in = (__force __wsum)srx->trailer.crc; 992 993 if (unlikely(crc_in != crc_own)) { 994 pr_warn("siw: crc error. in: %08x, own %08x, op %u\n", 995 crc_in, crc_own, qp->rx_stream.rdmap_op); 996 997 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, 998 LLP_ETYPE_MPA, 999 LLP_ECODE_RECEIVED_CRC, 0); 1000 return -EINVAL; 1001 } 1002 return 0; 1003 } 1004 1005 #define MIN_DDP_HDR sizeof(struct iwarp_ctrl_tagged) 1006 1007 static int siw_get_hdr(struct siw_rx_stream *srx) 1008 { 1009 struct sk_buff *skb = srx->skb; 1010 struct siw_qp *qp = rx_qp(srx); 1011 struct iwarp_ctrl *c_hdr = &srx->hdr.ctrl; 1012 struct siw_rx_fpdu *frx; 1013 u8 opcode; 1014 int bytes; 1015 1016 if (srx->fpdu_part_rcvd < MIN_DDP_HDR) { 1017 /* 1018 * copy a mimimum sized (tagged) DDP frame control part 1019 */ 1020 bytes = min_t(int, srx->skb_new, 1021 MIN_DDP_HDR - srx->fpdu_part_rcvd); 1022 1023 skb_copy_bits(skb, srx->skb_offset, 1024 (char *)c_hdr + srx->fpdu_part_rcvd, bytes); 1025 1026 srx->fpdu_part_rcvd += bytes; 1027 1028 srx->skb_new -= bytes; 1029 srx->skb_offset += bytes; 1030 srx->skb_copied += bytes; 1031 1032 if (srx->fpdu_part_rcvd < MIN_DDP_HDR) 1033 return -EAGAIN; 1034 1035 if (unlikely(__ddp_get_version(c_hdr) != DDP_VERSION)) { 1036 enum ddp_etype etype; 1037 enum ddp_ecode ecode; 1038 1039 pr_warn("siw: received ddp version unsupported %d\n", 1040 __ddp_get_version(c_hdr)); 1041 1042 if (c_hdr->ddp_rdmap_ctrl & DDP_FLAG_TAGGED) { 1043 etype = DDP_ETYPE_TAGGED_BUF; 1044 ecode = DDP_ECODE_T_VERSION; 1045 } else { 1046 etype = DDP_ETYPE_UNTAGGED_BUF; 1047 ecode = DDP_ECODE_UT_VERSION; 1048 } 1049 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_DDP, 1050 etype, ecode, 0); 1051 return -EINVAL; 1052 } 1053 if (unlikely(__rdmap_get_version(c_hdr) != RDMAP_VERSION)) { 1054 pr_warn("siw: received rdmap version unsupported %d\n", 1055 __rdmap_get_version(c_hdr)); 1056 1057 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP, 1058 RDMAP_ETYPE_REMOTE_OPERATION, 1059 RDMAP_ECODE_VERSION, 0); 1060 return -EINVAL; 1061 } 1062 opcode = __rdmap_get_opcode(c_hdr); 1063 1064 if (opcode > RDMAP_TERMINATE) { 1065 pr_warn("siw: received unknown packet type %u\n", 1066 opcode); 1067 1068 siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_RDMAP, 1069 RDMAP_ETYPE_REMOTE_OPERATION, 1070 RDMAP_ECODE_OPCODE, 0); 1071 return -EINVAL; 1072 } 1073 siw_dbg_qp(rx_qp(srx), "new header, opcode %u\n", opcode); 1074 } else { 1075 opcode = __rdmap_get_opcode(c_hdr); 1076 } 1077 set_rx_fpdu_context(qp, opcode); 1078 frx = qp->rx_fpdu; 1079 1080 /* 1081 * Figure out len of current hdr: variable length of 1082 * iwarp hdr may force us to copy hdr information in 1083 * two steps. Only tagged DDP messages are already 1084 * completely received. 1085 */ 1086 if (iwarp_pktinfo[opcode].hdr_len > sizeof(struct iwarp_ctrl_tagged)) { 1087 int hdrlen = iwarp_pktinfo[opcode].hdr_len; 1088 1089 bytes = min_t(int, hdrlen - MIN_DDP_HDR, srx->skb_new); 1090 1091 skb_copy_bits(skb, srx->skb_offset, 1092 (char *)c_hdr + srx->fpdu_part_rcvd, bytes); 1093 1094 srx->fpdu_part_rcvd += bytes; 1095 1096 srx->skb_new -= bytes; 1097 srx->skb_offset += bytes; 1098 srx->skb_copied += bytes; 1099 1100 if (srx->fpdu_part_rcvd < hdrlen) 1101 return -EAGAIN; 1102 } 1103 1104 /* 1105 * DDP/RDMAP header receive completed. Check if the current 1106 * DDP segment starts a new RDMAP message or continues a previously 1107 * started RDMAP message. 1108 * 1109 * Alternating reception of DDP segments (or FPDUs) from incomplete 1110 * tagged and untagged RDMAP messages is supported, as long as 1111 * the current tagged or untagged message gets eventually completed 1112 * w/o intersection from another message of the same type 1113 * (tagged/untagged). E.g., a WRITE can get intersected by a SEND, 1114 * but not by a READ RESPONSE etc. 1115 */ 1116 if (srx->mpa_crc_hd) { 1117 /* 1118 * Restart CRC computation 1119 */ 1120 crypto_shash_init(srx->mpa_crc_hd); 1121 crypto_shash_update(srx->mpa_crc_hd, (u8 *)c_hdr, 1122 srx->fpdu_part_rcvd); 1123 } 1124 if (frx->more_ddp_segs) { 1125 frx->first_ddp_seg = 0; 1126 if (frx->prev_rdmap_op != opcode) { 1127 pr_warn("siw: packet intersection: %u : %u\n", 1128 frx->prev_rdmap_op, opcode); 1129 /* 1130 * The last inbound RDMA operation of same type 1131 * (tagged or untagged) is left unfinished. 1132 * To complete it in error, make it the current 1133 * operation again, even with the header already 1134 * overwritten. For error handling, only the opcode 1135 * and current rx context are relevant. 1136 */ 1137 set_rx_fpdu_context(qp, frx->prev_rdmap_op); 1138 __rdmap_set_opcode(c_hdr, frx->prev_rdmap_op); 1139 return -EPROTO; 1140 } 1141 } else { 1142 frx->prev_rdmap_op = opcode; 1143 frx->first_ddp_seg = 1; 1144 } 1145 frx->more_ddp_segs = c_hdr->ddp_rdmap_ctrl & DDP_FLAG_LAST ? 0 : 1; 1146 1147 return 0; 1148 } 1149 1150 static int siw_check_tx_fence(struct siw_qp *qp) 1151 { 1152 struct siw_wqe *tx_waiting = tx_wqe(qp); 1153 struct siw_sqe *rreq; 1154 int resume_tx = 0, rv = 0; 1155 unsigned long flags; 1156 1157 spin_lock_irqsave(&qp->orq_lock, flags); 1158 1159 /* free current orq entry */ 1160 rreq = orq_get_current(qp); 1161 WRITE_ONCE(rreq->flags, 0); 1162 1163 qp->orq_get++; 1164 1165 if (qp->tx_ctx.orq_fence) { 1166 if (unlikely(tx_waiting->wr_status != SIW_WR_QUEUED)) { 1167 pr_warn("siw: [QP %u]: fence resume: bad status %d\n", 1168 qp_id(qp), tx_waiting->wr_status); 1169 rv = -EPROTO; 1170 goto out; 1171 } 1172 /* resume SQ processing, if possible */ 1173 if (tx_waiting->sqe.opcode == SIW_OP_READ || 1174 tx_waiting->sqe.opcode == SIW_OP_READ_LOCAL_INV) { 1175 1176 /* SQ processing was stopped because of a full ORQ */ 1177 rreq = orq_get_free(qp); 1178 if (unlikely(!rreq)) { 1179 pr_warn("siw: [QP %u]: no ORQE\n", qp_id(qp)); 1180 rv = -EPROTO; 1181 goto out; 1182 } 1183 siw_read_to_orq(rreq, &tx_waiting->sqe); 1184 1185 qp->orq_put++; 1186 qp->tx_ctx.orq_fence = 0; 1187 resume_tx = 1; 1188 1189 } else if (siw_orq_empty(qp)) { 1190 /* 1191 * SQ processing was stopped by fenced work request. 1192 * Resume since all previous Read's are now completed. 1193 */ 1194 qp->tx_ctx.orq_fence = 0; 1195 resume_tx = 1; 1196 } 1197 } 1198 out: 1199 spin_unlock_irqrestore(&qp->orq_lock, flags); 1200 1201 if (resume_tx) 1202 rv = siw_sq_start(qp); 1203 1204 return rv; 1205 } 1206 1207 /* 1208 * siw_rdmap_complete() 1209 * 1210 * Complete processing of an RDMA message after receiving all 1211 * DDP segmens or ABort processing after encountering error case. 1212 * 1213 * o SENDs + RRESPs will need for completion, 1214 * o RREQs need for READ RESPONSE initialization 1215 * o WRITEs need memory dereferencing 1216 * 1217 * TODO: Failed WRITEs need local error to be surfaced. 1218 */ 1219 static int siw_rdmap_complete(struct siw_qp *qp, int error) 1220 { 1221 struct siw_rx_stream *srx = &qp->rx_stream; 1222 struct siw_wqe *wqe = rx_wqe(qp->rx_fpdu); 1223 enum siw_wc_status wc_status = wqe->wc_status; 1224 u8 opcode = __rdmap_get_opcode(&srx->hdr.ctrl); 1225 int rv = 0; 1226 1227 switch (opcode) { 1228 case RDMAP_SEND_SE: 1229 case RDMAP_SEND_SE_INVAL: 1230 wqe->rqe.flags |= SIW_WQE_SOLICITED; 1231 fallthrough; 1232 1233 case RDMAP_SEND: 1234 case RDMAP_SEND_INVAL: 1235 if (wqe->wr_status == SIW_WR_IDLE) 1236 break; 1237 1238 srx->ddp_msn[RDMAP_UNTAGGED_QN_SEND]++; 1239 1240 if (error != 0 && wc_status == SIW_WC_SUCCESS) 1241 wc_status = SIW_WC_GENERAL_ERR; 1242 /* 1243 * Handle STag invalidation request 1244 */ 1245 if (wc_status == SIW_WC_SUCCESS && 1246 (opcode == RDMAP_SEND_INVAL || 1247 opcode == RDMAP_SEND_SE_INVAL)) { 1248 rv = siw_invalidate_stag(qp->pd, srx->inval_stag); 1249 if (rv) { 1250 siw_init_terminate( 1251 qp, TERM_ERROR_LAYER_RDMAP, 1252 rv == -EACCES ? 1253 RDMAP_ETYPE_REMOTE_PROTECTION : 1254 RDMAP_ETYPE_REMOTE_OPERATION, 1255 RDMAP_ECODE_CANNOT_INVALIDATE, 0); 1256 1257 wc_status = SIW_WC_REM_INV_REQ_ERR; 1258 } 1259 rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed, 1260 rv ? 0 : srx->inval_stag, 1261 wc_status); 1262 } else { 1263 rv = siw_rqe_complete(qp, &wqe->rqe, wqe->processed, 1264 0, wc_status); 1265 } 1266 siw_wqe_put_mem(wqe, SIW_OP_RECEIVE); 1267 break; 1268 1269 case RDMAP_RDMA_READ_RESP: 1270 if (wqe->wr_status == SIW_WR_IDLE) 1271 break; 1272 1273 if (error != 0) { 1274 if ((srx->state == SIW_GET_HDR && 1275 qp->rx_fpdu->first_ddp_seg) || error == -ENODATA) 1276 /* possible RREQ in ORQ left untouched */ 1277 break; 1278 1279 if (wc_status == SIW_WC_SUCCESS) 1280 wc_status = SIW_WC_GENERAL_ERR; 1281 } else if (rdma_is_kernel_res(&qp->base_qp.res) && 1282 rx_type(wqe) == SIW_OP_READ_LOCAL_INV) { 1283 /* 1284 * Handle any STag invalidation request 1285 */ 1286 rv = siw_invalidate_stag(qp->pd, wqe->sqe.sge[0].lkey); 1287 if (rv) { 1288 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP, 1289 RDMAP_ETYPE_CATASTROPHIC, 1290 RDMAP_ECODE_UNSPECIFIED, 0); 1291 1292 if (wc_status == SIW_WC_SUCCESS) { 1293 wc_status = SIW_WC_GENERAL_ERR; 1294 error = rv; 1295 } 1296 } 1297 } 1298 /* 1299 * All errors turn the wqe into signalled. 1300 */ 1301 if ((wqe->sqe.flags & SIW_WQE_SIGNALLED) || error != 0) 1302 rv = siw_sqe_complete(qp, &wqe->sqe, wqe->processed, 1303 wc_status); 1304 siw_wqe_put_mem(wqe, SIW_OP_READ); 1305 1306 if (!error) { 1307 rv = siw_check_tx_fence(qp); 1308 } else { 1309 /* Disable current ORQ element */ 1310 if (qp->attrs.orq_size) 1311 WRITE_ONCE(orq_get_current(qp)->flags, 0); 1312 } 1313 break; 1314 1315 case RDMAP_RDMA_READ_REQ: 1316 if (!error) { 1317 rv = siw_init_rresp(qp, srx); 1318 srx->ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ]++; 1319 } 1320 break; 1321 1322 case RDMAP_RDMA_WRITE: 1323 if (wqe->wr_status == SIW_WR_IDLE) 1324 break; 1325 1326 /* 1327 * Free References from memory object if 1328 * attached to receive context (inbound WRITE). 1329 * While a zero-length WRITE is allowed, 1330 * no memory reference got created. 1331 */ 1332 if (rx_mem(&qp->rx_tagged)) { 1333 siw_mem_put(rx_mem(&qp->rx_tagged)); 1334 rx_mem(&qp->rx_tagged) = NULL; 1335 } 1336 break; 1337 1338 default: 1339 break; 1340 } 1341 wqe->wr_status = SIW_WR_IDLE; 1342 1343 return rv; 1344 } 1345 1346 /* 1347 * siw_tcp_rx_data() 1348 * 1349 * Main routine to consume inbound TCP payload 1350 * 1351 * @rd_desc: read descriptor 1352 * @skb: socket buffer 1353 * @off: offset in skb 1354 * @len: skb->len - offset : payload in skb 1355 */ 1356 int siw_tcp_rx_data(read_descriptor_t *rd_desc, struct sk_buff *skb, 1357 unsigned int off, size_t len) 1358 { 1359 struct siw_qp *qp = rd_desc->arg.data; 1360 struct siw_rx_stream *srx = &qp->rx_stream; 1361 int rv; 1362 1363 srx->skb = skb; 1364 srx->skb_new = skb->len - off; 1365 srx->skb_offset = off; 1366 srx->skb_copied = 0; 1367 1368 siw_dbg_qp(qp, "new data, len %d\n", srx->skb_new); 1369 1370 while (srx->skb_new) { 1371 int run_completion = 1; 1372 1373 if (unlikely(srx->rx_suspend)) { 1374 /* Do not process any more data */ 1375 srx->skb_copied += srx->skb_new; 1376 break; 1377 } 1378 switch (srx->state) { 1379 case SIW_GET_HDR: 1380 rv = siw_get_hdr(srx); 1381 if (!rv) { 1382 srx->fpdu_part_rem = 1383 be16_to_cpu(srx->hdr.ctrl.mpa_len) - 1384 srx->fpdu_part_rcvd + MPA_HDR_SIZE; 1385 1386 if (srx->fpdu_part_rem) 1387 srx->pad = -srx->fpdu_part_rem & 0x3; 1388 else 1389 srx->pad = 0; 1390 1391 srx->state = SIW_GET_DATA_START; 1392 srx->fpdu_part_rcvd = 0; 1393 } 1394 break; 1395 1396 case SIW_GET_DATA_MORE: 1397 /* 1398 * Another data fragment of the same DDP segment. 1399 * Setting first_ddp_seg = 0 avoids repeating 1400 * initializations that shall occur only once per 1401 * DDP segment. 1402 */ 1403 qp->rx_fpdu->first_ddp_seg = 0; 1404 fallthrough; 1405 1406 case SIW_GET_DATA_START: 1407 /* 1408 * Headers will be checked by the opcode-specific 1409 * data receive function below. 1410 */ 1411 rv = iwarp_pktinfo[qp->rx_stream.rdmap_op].rx_data(qp); 1412 if (!rv) { 1413 int mpa_len = 1414 be16_to_cpu(srx->hdr.ctrl.mpa_len) 1415 + MPA_HDR_SIZE; 1416 1417 srx->fpdu_part_rem = (-mpa_len & 0x3) 1418 + MPA_CRC_SIZE; 1419 srx->fpdu_part_rcvd = 0; 1420 srx->state = SIW_GET_TRAILER; 1421 } else { 1422 if (unlikely(rv == -ECONNRESET)) 1423 run_completion = 0; 1424 else 1425 srx->state = SIW_GET_DATA_MORE; 1426 } 1427 break; 1428 1429 case SIW_GET_TRAILER: 1430 /* 1431 * read CRC + any padding 1432 */ 1433 rv = siw_get_trailer(qp, srx); 1434 if (likely(!rv)) { 1435 /* 1436 * FPDU completed. 1437 * complete RDMAP message if last fragment 1438 */ 1439 srx->state = SIW_GET_HDR; 1440 srx->fpdu_part_rcvd = 0; 1441 1442 if (!(srx->hdr.ctrl.ddp_rdmap_ctrl & 1443 DDP_FLAG_LAST)) 1444 /* more frags */ 1445 break; 1446 1447 rv = siw_rdmap_complete(qp, 0); 1448 run_completion = 0; 1449 } 1450 break; 1451 1452 default: 1453 pr_warn("QP[%u]: RX out of state\n", qp_id(qp)); 1454 rv = -EPROTO; 1455 run_completion = 0; 1456 } 1457 if (unlikely(rv != 0 && rv != -EAGAIN)) { 1458 if ((srx->state > SIW_GET_HDR || 1459 qp->rx_fpdu->more_ddp_segs) && run_completion) 1460 siw_rdmap_complete(qp, rv); 1461 1462 siw_dbg_qp(qp, "rx error %d, rx state %d\n", rv, 1463 srx->state); 1464 1465 siw_qp_cm_drop(qp, 1); 1466 1467 break; 1468 } 1469 if (rv) { 1470 siw_dbg_qp(qp, "fpdu fragment, state %d, missing %d\n", 1471 srx->state, srx->fpdu_part_rem); 1472 break; 1473 } 1474 } 1475 return srx->skb_copied; 1476 } 1477