aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/ipath/ipath_uc.c
blob: 82cc588b8bf23d3a75ca15f3171c50df6c1d1943 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
/*
 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "ipath_verbs.h"
#include "ipath_kernel.h"

/* cut down ridiculously long IB macro names */
#define OP(x) IB_OPCODE_UC_##x

/**
 * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
 * @qp: a pointer to the QP
 *
 * Return 1 if constructed; otherwise, return 0.
 */
int ipath_make_uc_req(struct ipath_qp *qp)
{
	struct ipath_other_headers *ohdr;
	struct ipath_swqe *wqe;
	unsigned long flags;
	u32 hwords;
	u32 bth0;
	u32 len;
	u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
	int ret = 0;

	spin_lock_irqsave(&qp->s_lock, flags);

	if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
		if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND))
			goto bail;
		/* We are in the error state, flush the work request. */
		if (qp->s_last == qp->s_head)
			goto bail;
		/* If DMAs are in progress, we can't flush immediately. */
		if (atomic_read(&qp->s_dma_busy)) {
			qp->s_flags |= IPATH_S_WAIT_DMA;
			goto bail;
		}
		wqe = get_swqe_ptr(qp, qp->s_last);
		ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
		goto done;
	}

	ohdr = &qp->s_hdr.u.oth;
	if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
		ohdr = &qp->s_hdr.u.l.oth;

	/* header size in 32-bit words LRH+BTH = (8+12)/4. */
	hwords = 5;
	bth0 = 1 << 22; /* Set M bit */

	/* Get the next send request. */
	wqe = get_swqe_ptr(qp, qp->s_cur);
	qp->s_wqe = NULL;
	switch (qp->s_state) {
	default:
		if (!(ib_ipath_state_ops[qp->state] &
		    IPATH_PROCESS_NEXT_SEND_OK))
			goto bail;
		/* Check if send work queue is empty. */
		if (qp->s_cur == qp->s_head)
			goto bail;
		/*
		 * Start a new request.
		 */
		qp->s_psn = wqe->psn = qp->s_next_psn;
		qp->s_sge.sge = wqe->sg_list[0];
		qp->s_sge.sg_list = wqe->sg_list + 1;
		qp->s_sge.num_sge = wqe->wr.num_sge;
		qp->s_len = len = wqe->length;
		switch (wqe->wr.opcode) {
		case IB_WR_SEND:
		case IB_WR_SEND_WITH_IMM:
			if (len > pmtu) {
				qp->s_state = OP(SEND_FIRST);
				len = pmtu;
				break;
			}
			if (wqe->wr.opcode == IB_WR_SEND)
				qp->s_state = OP(SEND_ONLY);
			else {
				qp->s_state =
					OP(SEND_ONLY_WITH_IMMEDIATE);
				/* Immediate data comes after the BTH */
				ohdr->u.imm_data = wqe->wr.ex.imm_data;
				hwords += 1;
			}
			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
				bth0 |= 1 << 23;
			qp->s_wqe = wqe;
			if (++qp->s_cur >= qp->s_size)
				qp->s_cur = 0;
			break;

		case IB_WR_RDMA_WRITE:
		case IB_WR_RDMA_WRITE_WITH_IMM:
			ohdr->u.rc.reth.vaddr =
				cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
			ohdr->u.rc.reth.rkey =
				cpu_to_be32(wqe->wr.wr.rdma.rkey);
			ohdr->u.rc.reth.length = cpu_to_be32(len);
			hwords += sizeof(struct ib_reth) / 4;
			if (len > pmtu) {
				qp->s_state = OP(RDMA_WRITE_FIRST);
				len = pmtu;
				break;
			}
			if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
				qp->s_state = OP(RDMA_WRITE_ONLY);
			else {
				qp->s_state =
					OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
				/* Immediate data comes after the RETH */
				ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
				hwords += 1;
				if (wqe->wr.send_flags & IB_SEND_SOLICITED)
					bth0 |= 1 << 23;
			}
			qp->s_wqe = wqe;
			if (++qp->s_cur >= qp->s_size)
				qp->s_cur = 0;
			break;

		default:
			goto bail;
		}
		break;

	case OP(SEND_FIRST):
		qp->s_state = OP(SEND_MIDDLE);
		/* FALLTHROUGH */
	case OP(SEND_MIDDLE):
		len = qp->s_len;
		if (len > pmtu) {
			len = pmtu;
			break;
		}
		if (wqe->wr.opcode == IB_WR_SEND)
			qp->s_state = OP(SEND_LAST);
		else {
			qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
			/* Immediate data comes after the BTH */
			ohdr->u.imm_data = wqe->wr.ex.imm_data;
			hwords += 1;
		}
		if (wqe->wr.send_flags & IB_SEND_SOLICITED)
			bth0 |= 1 << 23;
		qp->s_wqe = wqe;
		if (++qp->s_cur >= qp->s_size)
			qp->s_cur = 0;
		break;

	case OP(RDMA_WRITE_FIRST):
		qp->s_state = OP(RDMA_WRITE_MIDDLE);
		/* FALLTHROUGH */
	case OP(RDMA_WRITE_MIDDLE):
		len = qp->s_len;
		if (len > pmtu) {
			len = pmtu;
			break;
		}
		if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
			qp->s_state = OP(RDMA_WRITE_LAST);
		else {
			qp->s_state =
				OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
			/* Immediate data comes after the BTH */
			ohdr->u.imm_data = wqe->wr.ex.imm_data;
			hwords += 1;
			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
				bth0 |= 1 << 23;
		}
		qp->s_wqe = wqe;
		if (++qp->s_cur >= qp->s_size)
			qp->s_cur = 0;
		break;
	}
	qp->s_len -= len;
	qp->s_hdrwords = hwords;
	qp->s_cur_sge = &qp->s_sge;
	qp->s_cur_size = len;
	ipath_make_ruc_header(to_idev(qp->ibqp.device),
			      qp, ohdr, bth0 | (qp->s_state << 24),
			      qp->s_next_psn++ & IPATH_PSN_MASK);
done:
	ret = 1;
	goto unlock;

bail:
	qp->s_flags &= ~IPATH_S_BUSY;
unlock:
	spin_unlock_irqrestore(&qp->s_lock, flags);
	return ret;
}

/**
 * ipath_uc_rcv - handle an incoming UC packet
 * @dev: the device the packet came in on
 * @hdr: the header of the packet
 * @has_grh: true if the packet has a GRH
 * @data: the packet data
 * @tlen: the length of the packet
 * @qp: the QP for this packet.
 *
 * This is called from ipath_qp_rcv() to process an incoming UC packet
 * for the given QP.
 * Called at interrupt level.
 */
void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
		  int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
{
	struct ipath_other_headers *ohdr;
	int opcode;
	u32 hdrsize;
	u32 psn;
	u32 pad;
	struct ib_wc wc;
	u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
	struct ib_reth *reth;
	int header_in_data;

	/* Validate the SLID. See Ch. 9.6.1.5 */
	if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
		goto done;

	/* Check for GRH */
	if (!has_grh) {
		ohdr = &hdr->u.oth;
		hdrsize = 8 + 12;	/* LRH + BTH */
		psn = be32_to_cpu(ohdr->bth[2]);
		header_in_data = 0;
	} else {
		ohdr = &hdr->u.l.oth;
		hdrsize = 8 + 40 + 12;	/* LRH + GRH + BTH */
		/*
		 * The header with GRH is 60 bytes and the
		 * core driver sets the eager header buffer
		 * size to 56 bytes so the last 4 bytes of
		 * the BTH header (PSN) is in the data buffer.
		 */
		header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
		if (header_in_data) {
			psn = be32_to_cpu(((__be32 *) data)[0]);
			data += sizeof(__be32);
		} else
			psn = be32_to_cpu(ohdr->bth[2]);
	}
	/*
	 * The opcode is in the low byte when its in network order
	 * (top byte when in host order).
	 */
	opcode = be32_to_cpu(ohdr->bth[0]) >> 24;

	memset(&wc, 0, sizeof wc);

	/* Compare the PSN verses the expected PSN. */
	if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
		/*
		 * Handle a sequence error.
		 * Silently drop any current message.
		 */
		qp->r_psn = psn;
	inv:
		qp->r_state = OP(SEND_LAST);
		switch (opcode) {
		case OP(SEND_FIRST):
		case OP(SEND_ONLY):
		case OP(SEND_ONLY_WITH_IMMEDIATE):
			goto send_first;

		case OP(RDMA_WRITE_FIRST):
		case OP(RDMA_WRITE_ONLY):
		case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
			goto rdma_first;

		default:
			dev->n_pkt_drops++;
			goto done;
		}
	}

	/* Check for opcode sequence errors. */
	switch (qp->r_state) {
	case OP(SEND_FIRST):
	case OP(SEND_MIDDLE):
		if (opcode == OP(SEND_MIDDLE) ||
		    opcode == OP(SEND_LAST) ||
		    opcode == OP(SEND_LAST_WITH_IMMEDIATE))
			break;
		goto inv;

	case OP(RDMA_WRITE_FIRST):
	case OP(RDMA_WRITE_MIDDLE):
		if (opcode == OP(RDMA_WRITE_MIDDLE) ||
		    opcode == OP(RDMA_WRITE_LAST) ||
		    opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
			break;
		goto inv;

	default:
		if (opcode == OP(SEND_FIRST) ||
		    opcode == OP(SEND_ONLY) ||
		    opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
		    opcode == OP(RDMA_WRITE_FIRST) ||
		    opcode == OP(RDMA_WRITE_ONLY) ||
		    opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
			break;
		goto inv;
	}

	/* OK, process the packet. */
	switch (opcode) {
	case OP(SEND_FIRST):
	case OP(SEND_ONLY):
	case OP(SEND_ONLY_WITH_IMMEDIATE):
	send_first:
		if (qp->r_flags & IPATH_R_REUSE_SGE) {
			qp->r_flags &= ~IPATH_R_REUSE_SGE;
			qp->r_sge = qp->s_rdma_read_sge;
		} else if (!ipath_get_rwqe(qp, 0)) {
			dev->n_pkt_drops++;
			goto done;
		}
		/* Save the WQE so we can reuse it in case of an error. */
		qp->s_rdma_read_sge = qp->r_sge;
		qp->r_rcv_len = 0;
		if (opcode == OP(SEND_ONLY))
			goto send_last;
		else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
			goto send_last_imm;
		/* FALLTHROUGH */
	case OP(SEND_MIDDLE):
		/* Check for invalid length PMTU or posted rwqe len. */
		if (unlikely(tlen != (hdrsize + pmtu + 4))) {
			qp->r_flags |= IPATH_R_REUSE_SGE;
			dev->n_pkt_drops++;
			goto done;
		}
		qp->r_rcv_len += pmtu;
		if (unlikely(qp->r_rcv_len > qp->r_len)) {
			qp->r_flags |= IPATH_R_REUSE_SGE;
			dev->n_pkt_drops++;
			goto done;
		}
		ipath_copy_sge(&qp->r_sge, data, pmtu);
		break;

	case OP(SEND_LAST_WITH_IMMEDIATE):
	send_last_imm:
		if (header_in_data) {
			wc.ex.imm_data = *(__be32 *) data;
			data += sizeof(__be32);
		} else {
			/* Immediate data comes after BTH */
			wc.ex.imm_data = ohdr->u.imm_data;
		}
		hdrsize += 4;
		wc.wc_flags = IB_WC_WITH_IMM;
		/* FALLTHROUGH */
	case OP(SEND_LAST):
	send_last:
		/* Get the number of bytes the message was padded by. */
		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
		/* Check for invalid length. */
		/* XXX LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4))) {
			qp->r_flags |= IPATH_R_REUSE_SGE;
			dev->n_pkt_drops++;
			goto done;
		}
		/* Don't count the CRC. */
		tlen -= (hdrsize + pad + 4);
		wc.byte_len = tlen + qp->r_rcv_len;
		if (unlikely(wc.byte_len > qp->r_len)) {
			qp->r_flags |= IPATH_R_REUSE_SGE;
			dev->n_pkt_drops++;
			goto done;
		}
		wc.opcode = IB_WC_RECV;
	last_imm:
		ipath_copy_sge(&qp->r_sge, data, tlen);
		wc.wr_id = qp->r_wr_id;
		wc.status = IB_WC_SUCCESS;
		wc.qp = &qp->ibqp;
		wc.src_qp = qp->remote_qpn;
		wc.slid = qp->remote_ah_attr.dlid;
		wc.sl = qp->remote_ah_attr.sl;
		/* Signal completion event if the solicited bit is set. */
		ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
			       (ohdr->bth[0] &
				__constant_cpu_to_be32(1 << 23)) != 0);
		break;

	case OP(RDMA_WRITE_FIRST):
	case OP(RDMA_WRITE_ONLY):
	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
	rdma_first:
		/* RETH comes after BTH */
		if (!header_in_data)
			reth = &ohdr->u.rc.reth;
		else {
			reth = (struct ib_reth *)data;
			data += sizeof(*reth);
		}
		hdrsize += sizeof(*reth);
		qp->r_len = be32_to_cpu(reth->length);
		qp->r_rcv_len = 0;
		if (qp->r_len != 0) {
			u32 rkey = be32_to_cpu(reth->rkey);
			u64 vaddr = be64_to_cpu(reth->vaddr);
			int ok;

			/* Check rkey */
			ok = ipath_rkey_ok(qp, &qp->r_sge, qp->r_len,
					   vaddr, rkey,
					   IB_ACCESS_REMOTE_WRITE);
			if (unlikely(!ok)) {
				dev->n_pkt_drops++;
				goto done;
			}
		} else {
			qp->r_sge.sg_list = NULL;
			qp->r_sge.sge.mr = NULL;
			qp->r_sge.sge.vaddr = NULL;
			qp->r_sge.sge.length = 0;
			qp->r_sge.sge.sge_length = 0;
		}
		if (unlikely(!(qp->qp_access_flags &
			       IB_ACCESS_REMOTE_WRITE))) {
			dev->n_pkt_drops++;
			goto done;
		}
		if (opcode == OP(RDMA_WRITE_ONLY))
			goto rdma_last;
		else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
			goto rdma_last_imm;
		/* FALLTHROUGH */
	case OP(RDMA_WRITE_MIDDLE):
		/* Check for invalid length PMTU or posted rwqe len. */
		if (unlikely(tlen != (hdrsize + pmtu + 4))) {
			dev->n_pkt_drops++;
			goto done;
		}
		qp->r_rcv_len += pmtu;
		if (unlikely(qp->r_rcv_len > qp->r_len)) {
			dev->n_pkt_drops++;
			goto done;
		}
		ipath_copy_sge(&qp->r_sge, data, pmtu);
		break;

	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
	rdma_last_imm:
		if (header_in_data) {
			wc.ex.imm_data = *(__be32 *) data;
			data += sizeof(__be32);
		} else {
			/* Immediate data comes after BTH */
			wc.ex.imm_data = ohdr->u.imm_data;
		}
		hdrsize += 4;
		wc.wc_flags = IB_WC_WITH_IMM;

		/* Get the number of bytes the message was padded by. */
		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
		/* Check for invalid length. */
		/* XXX LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4))) {
			dev->n_pkt_drops++;
			goto done;
		}
		/* Don't count the CRC. */
		tlen -= (hdrsize + pad + 4);
		if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
			dev->n_pkt_drops++;
			goto done;
		}
		if (qp->r_flags & IPATH_R_REUSE_SGE)
			qp->r_flags &= ~IPATH_R_REUSE_SGE;
		else if (!ipath_get_rwqe(qp, 1)) {
			dev->n_pkt_drops++;
			goto done;
		}
		wc.byte_len = qp->r_len;
		wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
		goto last_imm;

	case OP(RDMA_WRITE_LAST):
	rdma_last:
		/* Get the number of bytes the message was padded by. */
		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
		/* Check for invalid length. */
		/* XXX LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4))) {
			dev->n_pkt_drops++;
			goto done;
		}
		/* Don't count the CRC. */
		tlen -= (hdrsize + pad + 4);
		if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
			dev->n_pkt_drops++;
			goto done;
		}
		ipath_copy_sge(&qp->r_sge, data, tlen);
		break;

	default:
		/* Drop packet for unknown opcodes. */
		dev->n_pkt_drops++;
		goto done;
	}
	qp->r_psn++;
	qp->r_state = opcode;
done:
	return;
}