1 /*
2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include "ipath_verbs.h"
35 #include "ipath_kernel.h"
36
37 /* cut down ridiculously long IB macro names */
38 #define OP(x) IB_OPCODE_UC_##x
39
40 /**
41 * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
42 * @qp: a pointer to the QP
43 *
44 * Return 1 if constructed; otherwise, return 0.
45 */
ipath_make_uc_req(struct ipath_qp * qp)46 int ipath_make_uc_req(struct ipath_qp *qp)
47 {
48 struct ipath_other_headers *ohdr;
49 struct ipath_swqe *wqe;
50 unsigned long flags;
51 u32 hwords;
52 u32 bth0;
53 u32 len;
54 u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
55 int ret = 0;
56
57 spin_lock_irqsave(&qp->s_lock, flags);
58
59 if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
60 if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND))
61 goto bail;
62 /* We are in the error state, flush the work request. */
63 if (qp->s_last == qp->s_head)
64 goto bail;
65 /* If DMAs are in progress, we can't flush immediately. */
66 if (atomic_read(&qp->s_dma_busy)) {
67 qp->s_flags |= IPATH_S_WAIT_DMA;
68 goto bail;
69 }
70 wqe = get_swqe_ptr(qp, qp->s_last);
71 ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
72 goto done;
73 }
74
75 ohdr = &qp->s_hdr.u.oth;
76 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
77 ohdr = &qp->s_hdr.u.l.oth;
78
79 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
80 hwords = 5;
81 bth0 = 1 << 22; /* Set M bit */
82
83 /* Get the next send request. */
84 wqe = get_swqe_ptr(qp, qp->s_cur);
85 qp->s_wqe = NULL;
86 switch (qp->s_state) {
87 default:
88 if (!(ib_ipath_state_ops[qp->state] &
89 IPATH_PROCESS_NEXT_SEND_OK))
90 goto bail;
91 /* Check if send work queue is empty. */
92 if (qp->s_cur == qp->s_head)
93 goto bail;
94 /*
95 * Start a new request.
96 */
97 qp->s_psn = wqe->psn = qp->s_next_psn;
98 qp->s_sge.sge = wqe->sg_list[0];
99 qp->s_sge.sg_list = wqe->sg_list + 1;
100 qp->s_sge.num_sge = wqe->wr.num_sge;
101 qp->s_len = len = wqe->length;
102 switch (wqe->wr.opcode) {
103 case IB_WR_SEND:
104 case IB_WR_SEND_WITH_IMM:
105 if (len > pmtu) {
106 qp->s_state = OP(SEND_FIRST);
107 len = pmtu;
108 break;
109 }
110 if (wqe->wr.opcode == IB_WR_SEND)
111 qp->s_state = OP(SEND_ONLY);
112 else {
113 qp->s_state =
114 OP(SEND_ONLY_WITH_IMMEDIATE);
115 /* Immediate data comes after the BTH */
116 ohdr->u.imm_data = wqe->wr.ex.imm_data;
117 hwords += 1;
118 }
119 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
120 bth0 |= 1 << 23;
121 qp->s_wqe = wqe;
122 if (++qp->s_cur >= qp->s_size)
123 qp->s_cur = 0;
124 break;
125
126 case IB_WR_RDMA_WRITE:
127 case IB_WR_RDMA_WRITE_WITH_IMM:
128 ohdr->u.rc.reth.vaddr =
129 cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
130 ohdr->u.rc.reth.rkey =
131 cpu_to_be32(wqe->wr.wr.rdma.rkey);
132 ohdr->u.rc.reth.length = cpu_to_be32(len);
133 hwords += sizeof(struct ib_reth) / 4;
134 if (len > pmtu) {
135 qp->s_state = OP(RDMA_WRITE_FIRST);
136 len = pmtu;
137 break;
138 }
139 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
140 qp->s_state = OP(RDMA_WRITE_ONLY);
141 else {
142 qp->s_state =
143 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
144 /* Immediate data comes after the RETH */
145 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
146 hwords += 1;
147 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
148 bth0 |= 1 << 23;
149 }
150 qp->s_wqe = wqe;
151 if (++qp->s_cur >= qp->s_size)
152 qp->s_cur = 0;
153 break;
154
155 default:
156 goto bail;
157 }
158 break;
159
160 case OP(SEND_FIRST):
161 qp->s_state = OP(SEND_MIDDLE);
162 /* FALLTHROUGH */
163 case OP(SEND_MIDDLE):
164 len = qp->s_len;
165 if (len > pmtu) {
166 len = pmtu;
167 break;
168 }
169 if (wqe->wr.opcode == IB_WR_SEND)
170 qp->s_state = OP(SEND_LAST);
171 else {
172 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
173 /* Immediate data comes after the BTH */
174 ohdr->u.imm_data = wqe->wr.ex.imm_data;
175 hwords += 1;
176 }
177 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
178 bth0 |= 1 << 23;
179 qp->s_wqe = wqe;
180 if (++qp->s_cur >= qp->s_size)
181 qp->s_cur = 0;
182 break;
183
184 case OP(RDMA_WRITE_FIRST):
185 qp->s_state = OP(RDMA_WRITE_MIDDLE);
186 /* FALLTHROUGH */
187 case OP(RDMA_WRITE_MIDDLE):
188 len = qp->s_len;
189 if (len > pmtu) {
190 len = pmtu;
191 break;
192 }
193 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
194 qp->s_state = OP(RDMA_WRITE_LAST);
195 else {
196 qp->s_state =
197 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
198 /* Immediate data comes after the BTH */
199 ohdr->u.imm_data = wqe->wr.ex.imm_data;
200 hwords += 1;
201 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
202 bth0 |= 1 << 23;
203 }
204 qp->s_wqe = wqe;
205 if (++qp->s_cur >= qp->s_size)
206 qp->s_cur = 0;
207 break;
208 }
209 qp->s_len -= len;
210 qp->s_hdrwords = hwords;
211 qp->s_cur_sge = &qp->s_sge;
212 qp->s_cur_size = len;
213 ipath_make_ruc_header(to_idev(qp->ibqp.device),
214 qp, ohdr, bth0 | (qp->s_state << 24),
215 qp->s_next_psn++ & IPATH_PSN_MASK);
216 done:
217 ret = 1;
218 goto unlock;
219
220 bail:
221 qp->s_flags &= ~IPATH_S_BUSY;
222 unlock:
223 spin_unlock_irqrestore(&qp->s_lock, flags);
224 return ret;
225 }
226
227 /**
228 * ipath_uc_rcv - handle an incoming UC packet
229 * @dev: the device the packet came in on
230 * @hdr: the header of the packet
231 * @has_grh: true if the packet has a GRH
232 * @data: the packet data
233 * @tlen: the length of the packet
234 * @qp: the QP for this packet.
235 *
236 * This is called from ipath_qp_rcv() to process an incoming UC packet
237 * for the given QP.
238 * Called at interrupt level.
239 */
ipath_uc_rcv(struct ipath_ibdev * dev,struct ipath_ib_header * hdr,int has_grh,void * data,u32 tlen,struct ipath_qp * qp)240 void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
241 int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
242 {
243 struct ipath_other_headers *ohdr;
244 int opcode;
245 u32 hdrsize;
246 u32 psn;
247 u32 pad;
248 struct ib_wc wc;
249 u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
250 struct ib_reth *reth;
251 int header_in_data;
252
253 /* Validate the SLID. See Ch. 9.6.1.5 */
254 if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
255 goto done;
256
257 /* Check for GRH */
258 if (!has_grh) {
259 ohdr = &hdr->u.oth;
260 hdrsize = 8 + 12; /* LRH + BTH */
261 psn = be32_to_cpu(ohdr->bth[2]);
262 header_in_data = 0;
263 } else {
264 ohdr = &hdr->u.l.oth;
265 hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
266 /*
267 * The header with GRH is 60 bytes and the
268 * core driver sets the eager header buffer
269 * size to 56 bytes so the last 4 bytes of
270 * the BTH header (PSN) is in the data buffer.
271 */
272 header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
273 if (header_in_data) {
274 psn = be32_to_cpu(((__be32 *) data)[0]);
275 data += sizeof(__be32);
276 } else
277 psn = be32_to_cpu(ohdr->bth[2]);
278 }
279 /*
280 * The opcode is in the low byte when its in network order
281 * (top byte when in host order).
282 */
283 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
284
285 memset(&wc, 0, sizeof wc);
286
287 /* Compare the PSN verses the expected PSN. */
288 if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
289 /*
290 * Handle a sequence error.
291 * Silently drop any current message.
292 */
293 qp->r_psn = psn;
294 inv:
295 qp->r_state = OP(SEND_LAST);
296 switch (opcode) {
297 case OP(SEND_FIRST):
298 case OP(SEND_ONLY):
299 case OP(SEND_ONLY_WITH_IMMEDIATE):
300 goto send_first;
301
302 case OP(RDMA_WRITE_FIRST):
303 case OP(RDMA_WRITE_ONLY):
304 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
305 goto rdma_first;
306
307 default:
308 dev->n_pkt_drops++;
309 goto done;
310 }
311 }
312
313 /* Check for opcode sequence errors. */
314 switch (qp->r_state) {
315 case OP(SEND_FIRST):
316 case OP(SEND_MIDDLE):
317 if (opcode == OP(SEND_MIDDLE) ||
318 opcode == OP(SEND_LAST) ||
319 opcode == OP(SEND_LAST_WITH_IMMEDIATE))
320 break;
321 goto inv;
322
323 case OP(RDMA_WRITE_FIRST):
324 case OP(RDMA_WRITE_MIDDLE):
325 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
326 opcode == OP(RDMA_WRITE_LAST) ||
327 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
328 break;
329 goto inv;
330
331 default:
332 if (opcode == OP(SEND_FIRST) ||
333 opcode == OP(SEND_ONLY) ||
334 opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
335 opcode == OP(RDMA_WRITE_FIRST) ||
336 opcode == OP(RDMA_WRITE_ONLY) ||
337 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
338 break;
339 goto inv;
340 }
341
342 /* OK, process the packet. */
343 switch (opcode) {
344 case OP(SEND_FIRST):
345 case OP(SEND_ONLY):
346 case OP(SEND_ONLY_WITH_IMMEDIATE):
347 send_first:
348 if (qp->r_flags & IPATH_R_REUSE_SGE) {
349 qp->r_flags &= ~IPATH_R_REUSE_SGE;
350 qp->r_sge = qp->s_rdma_read_sge;
351 } else if (!ipath_get_rwqe(qp, 0)) {
352 dev->n_pkt_drops++;
353 goto done;
354 }
355 /* Save the WQE so we can reuse it in case of an error. */
356 qp->s_rdma_read_sge = qp->r_sge;
357 qp->r_rcv_len = 0;
358 if (opcode == OP(SEND_ONLY))
359 goto send_last;
360 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
361 goto send_last_imm;
362 /* FALLTHROUGH */
363 case OP(SEND_MIDDLE):
364 /* Check for invalid length PMTU or posted rwqe len. */
365 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
366 qp->r_flags |= IPATH_R_REUSE_SGE;
367 dev->n_pkt_drops++;
368 goto done;
369 }
370 qp->r_rcv_len += pmtu;
371 if (unlikely(qp->r_rcv_len > qp->r_len)) {
372 qp->r_flags |= IPATH_R_REUSE_SGE;
373 dev->n_pkt_drops++;
374 goto done;
375 }
376 ipath_copy_sge(&qp->r_sge, data, pmtu);
377 break;
378
379 case OP(SEND_LAST_WITH_IMMEDIATE):
380 send_last_imm:
381 if (header_in_data) {
382 wc.ex.imm_data = *(__be32 *) data;
383 data += sizeof(__be32);
384 } else {
385 /* Immediate data comes after BTH */
386 wc.ex.imm_data = ohdr->u.imm_data;
387 }
388 hdrsize += 4;
389 wc.wc_flags = IB_WC_WITH_IMM;
390 /* FALLTHROUGH */
391 case OP(SEND_LAST):
392 send_last:
393 /* Get the number of bytes the message was padded by. */
394 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
395 /* Check for invalid length. */
396 /* XXX LAST len should be >= 1 */
397 if (unlikely(tlen < (hdrsize + pad + 4))) {
398 qp->r_flags |= IPATH_R_REUSE_SGE;
399 dev->n_pkt_drops++;
400 goto done;
401 }
402 /* Don't count the CRC. */
403 tlen -= (hdrsize + pad + 4);
404 wc.byte_len = tlen + qp->r_rcv_len;
405 if (unlikely(wc.byte_len > qp->r_len)) {
406 qp->r_flags |= IPATH_R_REUSE_SGE;
407 dev->n_pkt_drops++;
408 goto done;
409 }
410 wc.opcode = IB_WC_RECV;
411 last_imm:
412 ipath_copy_sge(&qp->r_sge, data, tlen);
413 wc.wr_id = qp->r_wr_id;
414 wc.status = IB_WC_SUCCESS;
415 wc.qp = &qp->ibqp;
416 wc.src_qp = qp->remote_qpn;
417 wc.slid = qp->remote_ah_attr.dlid;
418 wc.sl = qp->remote_ah_attr.sl;
419 /* Signal completion event if the solicited bit is set. */
420 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
421 (ohdr->bth[0] &
422 cpu_to_be32(1 << 23)) != 0);
423 break;
424
425 case OP(RDMA_WRITE_FIRST):
426 case OP(RDMA_WRITE_ONLY):
427 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
428 rdma_first:
429 /* RETH comes after BTH */
430 if (!header_in_data)
431 reth = &ohdr->u.rc.reth;
432 else {
433 reth = (struct ib_reth *)data;
434 data += sizeof(*reth);
435 }
436 hdrsize += sizeof(*reth);
437 qp->r_len = be32_to_cpu(reth->length);
438 qp->r_rcv_len = 0;
439 if (qp->r_len != 0) {
440 u32 rkey = be32_to_cpu(reth->rkey);
441 u64 vaddr = be64_to_cpu(reth->vaddr);
442 int ok;
443
444 /* Check rkey */
445 ok = ipath_rkey_ok(qp, &qp->r_sge, qp->r_len,
446 vaddr, rkey,
447 IB_ACCESS_REMOTE_WRITE);
448 if (unlikely(!ok)) {
449 dev->n_pkt_drops++;
450 goto done;
451 }
452 } else {
453 qp->r_sge.sg_list = NULL;
454 qp->r_sge.sge.mr = NULL;
455 qp->r_sge.sge.vaddr = NULL;
456 qp->r_sge.sge.length = 0;
457 qp->r_sge.sge.sge_length = 0;
458 }
459 if (unlikely(!(qp->qp_access_flags &
460 IB_ACCESS_REMOTE_WRITE))) {
461 dev->n_pkt_drops++;
462 goto done;
463 }
464 if (opcode == OP(RDMA_WRITE_ONLY))
465 goto rdma_last;
466 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
467 goto rdma_last_imm;
468 /* FALLTHROUGH */
469 case OP(RDMA_WRITE_MIDDLE):
470 /* Check for invalid length PMTU or posted rwqe len. */
471 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
472 dev->n_pkt_drops++;
473 goto done;
474 }
475 qp->r_rcv_len += pmtu;
476 if (unlikely(qp->r_rcv_len > qp->r_len)) {
477 dev->n_pkt_drops++;
478 goto done;
479 }
480 ipath_copy_sge(&qp->r_sge, data, pmtu);
481 break;
482
483 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
484 rdma_last_imm:
485 if (header_in_data) {
486 wc.ex.imm_data = *(__be32 *) data;
487 data += sizeof(__be32);
488 } else {
489 /* Immediate data comes after BTH */
490 wc.ex.imm_data = ohdr->u.imm_data;
491 }
492 hdrsize += 4;
493 wc.wc_flags = IB_WC_WITH_IMM;
494
495 /* Get the number of bytes the message was padded by. */
496 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
497 /* Check for invalid length. */
498 /* XXX LAST len should be >= 1 */
499 if (unlikely(tlen < (hdrsize + pad + 4))) {
500 dev->n_pkt_drops++;
501 goto done;
502 }
503 /* Don't count the CRC. */
504 tlen -= (hdrsize + pad + 4);
505 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
506 dev->n_pkt_drops++;
507 goto done;
508 }
509 if (qp->r_flags & IPATH_R_REUSE_SGE)
510 qp->r_flags &= ~IPATH_R_REUSE_SGE;
511 else if (!ipath_get_rwqe(qp, 1)) {
512 dev->n_pkt_drops++;
513 goto done;
514 }
515 wc.byte_len = qp->r_len;
516 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
517 goto last_imm;
518
519 case OP(RDMA_WRITE_LAST):
520 rdma_last:
521 /* Get the number of bytes the message was padded by. */
522 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
523 /* Check for invalid length. */
524 /* XXX LAST len should be >= 1 */
525 if (unlikely(tlen < (hdrsize + pad + 4))) {
526 dev->n_pkt_drops++;
527 goto done;
528 }
529 /* Don't count the CRC. */
530 tlen -= (hdrsize + pad + 4);
531 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
532 dev->n_pkt_drops++;
533 goto done;
534 }
535 ipath_copy_sge(&qp->r_sge, data, tlen);
536 break;
537
538 default:
539 /* Drop packet for unknown opcodes. */
540 dev->n_pkt_drops++;
541 goto done;
542 }
543 qp->r_psn++;
544 qp->r_state = opcode;
545 done:
546 return;
547 }
548