1 /*
2  * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
3  * All rights reserved.
4  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34 
35 #include "qib.h"
36 
37 /* cut down ridiculously long IB macro names */
38 #define OP(x) IB_OPCODE_UC_##x
39 
40 /**
41  * qib_make_uc_req - construct a request packet (SEND, RDMA write)
42  * @qp: a pointer to the QP
43  * @flags: unused
44  *
45  * Assumes the s_lock is held.
46  *
47  * Return 1 if constructed; otherwise, return 0.
48  */
qib_make_uc_req(struct rvt_qp * qp,unsigned long * flags)49 int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
50 {
51 	struct qib_qp_priv *priv = qp->priv;
52 	struct ib_other_headers *ohdr;
53 	struct rvt_swqe *wqe;
54 	u32 hwords;
55 	u32 bth0;
56 	u32 len;
57 	u32 pmtu = qp->pmtu;
58 	int ret = 0;
59 
60 	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
61 		if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
62 			goto bail;
63 		/* We are in the error state, flush the work request. */
64 		if (qp->s_last == READ_ONCE(qp->s_head))
65 			goto bail;
66 		/* If DMAs are in progress, we can't flush immediately. */
67 		if (atomic_read(&priv->s_dma_busy)) {
68 			qp->s_flags |= RVT_S_WAIT_DMA;
69 			goto bail;
70 		}
71 		wqe = rvt_get_swqe_ptr(qp, qp->s_last);
72 		rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
73 		goto done;
74 	}
75 
76 	ohdr = &priv->s_hdr->u.oth;
77 	if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
78 		ohdr = &priv->s_hdr->u.l.oth;
79 
80 	/* header size in 32-bit words LRH+BTH = (8+12)/4. */
81 	hwords = 5;
82 	bth0 = 0;
83 
84 	/* Get the next send request. */
85 	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
86 	qp->s_wqe = NULL;
87 	switch (qp->s_state) {
88 	default:
89 		if (!(ib_rvt_state_ops[qp->state] &
90 		    RVT_PROCESS_NEXT_SEND_OK))
91 			goto bail;
92 		/* Check if send work queue is empty. */
93 		if (qp->s_cur == READ_ONCE(qp->s_head))
94 			goto bail;
95 		/*
96 		 * Start a new request.
97 		 */
98 		qp->s_psn = wqe->psn;
99 		qp->s_sge.sge = wqe->sg_list[0];
100 		qp->s_sge.sg_list = wqe->sg_list + 1;
101 		qp->s_sge.num_sge = wqe->wr.num_sge;
102 		qp->s_sge.total_len = wqe->length;
103 		len = wqe->length;
104 		qp->s_len = len;
105 		switch (wqe->wr.opcode) {
106 		case IB_WR_SEND:
107 		case IB_WR_SEND_WITH_IMM:
108 			if (len > pmtu) {
109 				qp->s_state = OP(SEND_FIRST);
110 				len = pmtu;
111 				break;
112 			}
113 			if (wqe->wr.opcode == IB_WR_SEND)
114 				qp->s_state = OP(SEND_ONLY);
115 			else {
116 				qp->s_state =
117 					OP(SEND_ONLY_WITH_IMMEDIATE);
118 				/* Immediate data comes after the BTH */
119 				ohdr->u.imm_data = wqe->wr.ex.imm_data;
120 				hwords += 1;
121 			}
122 			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
123 				bth0 |= IB_BTH_SOLICITED;
124 			qp->s_wqe = wqe;
125 			if (++qp->s_cur >= qp->s_size)
126 				qp->s_cur = 0;
127 			break;
128 
129 		case IB_WR_RDMA_WRITE:
130 		case IB_WR_RDMA_WRITE_WITH_IMM:
131 			ohdr->u.rc.reth.vaddr =
132 				cpu_to_be64(wqe->rdma_wr.remote_addr);
133 			ohdr->u.rc.reth.rkey =
134 				cpu_to_be32(wqe->rdma_wr.rkey);
135 			ohdr->u.rc.reth.length = cpu_to_be32(len);
136 			hwords += sizeof(struct ib_reth) / 4;
137 			if (len > pmtu) {
138 				qp->s_state = OP(RDMA_WRITE_FIRST);
139 				len = pmtu;
140 				break;
141 			}
142 			if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
143 				qp->s_state = OP(RDMA_WRITE_ONLY);
144 			else {
145 				qp->s_state =
146 					OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
147 				/* Immediate data comes after the RETH */
148 				ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
149 				hwords += 1;
150 				if (wqe->wr.send_flags & IB_SEND_SOLICITED)
151 					bth0 |= IB_BTH_SOLICITED;
152 			}
153 			qp->s_wqe = wqe;
154 			if (++qp->s_cur >= qp->s_size)
155 				qp->s_cur = 0;
156 			break;
157 
158 		default:
159 			goto bail;
160 		}
161 		break;
162 
163 	case OP(SEND_FIRST):
164 		qp->s_state = OP(SEND_MIDDLE);
165 		fallthrough;
166 	case OP(SEND_MIDDLE):
167 		len = qp->s_len;
168 		if (len > pmtu) {
169 			len = pmtu;
170 			break;
171 		}
172 		if (wqe->wr.opcode == IB_WR_SEND)
173 			qp->s_state = OP(SEND_LAST);
174 		else {
175 			qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
176 			/* Immediate data comes after the BTH */
177 			ohdr->u.imm_data = wqe->wr.ex.imm_data;
178 			hwords += 1;
179 		}
180 		if (wqe->wr.send_flags & IB_SEND_SOLICITED)
181 			bth0 |= IB_BTH_SOLICITED;
182 		qp->s_wqe = wqe;
183 		if (++qp->s_cur >= qp->s_size)
184 			qp->s_cur = 0;
185 		break;
186 
187 	case OP(RDMA_WRITE_FIRST):
188 		qp->s_state = OP(RDMA_WRITE_MIDDLE);
189 		fallthrough;
190 	case OP(RDMA_WRITE_MIDDLE):
191 		len = qp->s_len;
192 		if (len > pmtu) {
193 			len = pmtu;
194 			break;
195 		}
196 		if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
197 			qp->s_state = OP(RDMA_WRITE_LAST);
198 		else {
199 			qp->s_state =
200 				OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
201 			/* Immediate data comes after the BTH */
202 			ohdr->u.imm_data = wqe->wr.ex.imm_data;
203 			hwords += 1;
204 			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
205 				bth0 |= IB_BTH_SOLICITED;
206 		}
207 		qp->s_wqe = wqe;
208 		if (++qp->s_cur >= qp->s_size)
209 			qp->s_cur = 0;
210 		break;
211 	}
212 	qp->s_len -= len;
213 	qp->s_hdrwords = hwords;
214 	qp->s_cur_sge = &qp->s_sge;
215 	qp->s_cur_size = len;
216 	qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
217 			    qp->s_psn++ & QIB_PSN_MASK);
218 done:
219 	return 1;
220 bail:
221 	qp->s_flags &= ~RVT_S_BUSY;
222 	return ret;
223 }
224 
225 /**
226  * qib_uc_rcv - handle an incoming UC packet
227  * @ibp: the port the packet came in on
228  * @hdr: the header of the packet
229  * @has_grh: true if the packet has a GRH
230  * @data: the packet data
231  * @tlen: the length of the packet
232  * @qp: the QP for this packet.
233  *
234  * This is called from qib_qp_rcv() to process an incoming UC packet
235  * for the given QP.
236  * Called at interrupt level.
237  */
qib_uc_rcv(struct qib_ibport * ibp,struct ib_header * hdr,int has_grh,void * data,u32 tlen,struct rvt_qp * qp)238 void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
239 		int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
240 {
241 	struct ib_other_headers *ohdr;
242 	u32 opcode;
243 	u32 hdrsize;
244 	u32 psn;
245 	u32 pad;
246 	struct ib_wc wc;
247 	u32 pmtu = qp->pmtu;
248 	struct ib_reth *reth;
249 	int ret;
250 
251 	/* Check for GRH */
252 	if (!has_grh) {
253 		ohdr = &hdr->u.oth;
254 		hdrsize = 8 + 12;       /* LRH + BTH */
255 	} else {
256 		ohdr = &hdr->u.l.oth;
257 		hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
258 	}
259 
260 	opcode = be32_to_cpu(ohdr->bth[0]);
261 	if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
262 		return;
263 
264 	psn = be32_to_cpu(ohdr->bth[2]);
265 	opcode >>= 24;
266 
267 	/* Compare the PSN verses the expected PSN. */
268 	if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
269 		/*
270 		 * Handle a sequence error.
271 		 * Silently drop any current message.
272 		 */
273 		qp->r_psn = psn;
274 inv:
275 		if (qp->r_state == OP(SEND_FIRST) ||
276 		    qp->r_state == OP(SEND_MIDDLE)) {
277 			set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
278 			qp->r_sge.num_sge = 0;
279 		} else
280 			rvt_put_ss(&qp->r_sge);
281 		qp->r_state = OP(SEND_LAST);
282 		switch (opcode) {
283 		case OP(SEND_FIRST):
284 		case OP(SEND_ONLY):
285 		case OP(SEND_ONLY_WITH_IMMEDIATE):
286 			goto send_first;
287 
288 		case OP(RDMA_WRITE_FIRST):
289 		case OP(RDMA_WRITE_ONLY):
290 		case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
291 			goto rdma_first;
292 
293 		default:
294 			goto drop;
295 		}
296 	}
297 
298 	/* Check for opcode sequence errors. */
299 	switch (qp->r_state) {
300 	case OP(SEND_FIRST):
301 	case OP(SEND_MIDDLE):
302 		if (opcode == OP(SEND_MIDDLE) ||
303 		    opcode == OP(SEND_LAST) ||
304 		    opcode == OP(SEND_LAST_WITH_IMMEDIATE))
305 			break;
306 		goto inv;
307 
308 	case OP(RDMA_WRITE_FIRST):
309 	case OP(RDMA_WRITE_MIDDLE):
310 		if (opcode == OP(RDMA_WRITE_MIDDLE) ||
311 		    opcode == OP(RDMA_WRITE_LAST) ||
312 		    opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
313 			break;
314 		goto inv;
315 
316 	default:
317 		if (opcode == OP(SEND_FIRST) ||
318 		    opcode == OP(SEND_ONLY) ||
319 		    opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
320 		    opcode == OP(RDMA_WRITE_FIRST) ||
321 		    opcode == OP(RDMA_WRITE_ONLY) ||
322 		    opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
323 			break;
324 		goto inv;
325 	}
326 
327 	if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
328 		rvt_comm_est(qp);
329 
330 	/* OK, process the packet. */
331 	switch (opcode) {
332 	case OP(SEND_FIRST):
333 	case OP(SEND_ONLY):
334 	case OP(SEND_ONLY_WITH_IMMEDIATE):
335 send_first:
336 		if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
337 			qp->r_sge = qp->s_rdma_read_sge;
338 		else {
339 			ret = rvt_get_rwqe(qp, false);
340 			if (ret < 0)
341 				goto op_err;
342 			if (!ret)
343 				goto drop;
344 			/*
345 			 * qp->s_rdma_read_sge will be the owner
346 			 * of the mr references.
347 			 */
348 			qp->s_rdma_read_sge = qp->r_sge;
349 		}
350 		qp->r_rcv_len = 0;
351 		if (opcode == OP(SEND_ONLY))
352 			goto no_immediate_data;
353 		else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
354 			goto send_last_imm;
355 		fallthrough;
356 	case OP(SEND_MIDDLE):
357 		/* Check for invalid length PMTU or posted rwqe len. */
358 		if (unlikely(tlen != (hdrsize + pmtu + 4)))
359 			goto rewind;
360 		qp->r_rcv_len += pmtu;
361 		if (unlikely(qp->r_rcv_len > qp->r_len))
362 			goto rewind;
363 		rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
364 		break;
365 
366 	case OP(SEND_LAST_WITH_IMMEDIATE):
367 send_last_imm:
368 		wc.ex.imm_data = ohdr->u.imm_data;
369 		hdrsize += 4;
370 		wc.wc_flags = IB_WC_WITH_IMM;
371 		goto send_last;
372 	case OP(SEND_LAST):
373 no_immediate_data:
374 		wc.ex.imm_data = 0;
375 		wc.wc_flags = 0;
376 send_last:
377 		/* Get the number of bytes the message was padded by. */
378 		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
379 		/* Check for invalid length. */
380 		/* XXX LAST len should be >= 1 */
381 		if (unlikely(tlen < (hdrsize + pad + 4)))
382 			goto rewind;
383 		/* Don't count the CRC. */
384 		tlen -= (hdrsize + pad + 4);
385 		wc.byte_len = tlen + qp->r_rcv_len;
386 		if (unlikely(wc.byte_len > qp->r_len))
387 			goto rewind;
388 		wc.opcode = IB_WC_RECV;
389 		rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
390 		rvt_put_ss(&qp->s_rdma_read_sge);
391 last_imm:
392 		wc.wr_id = qp->r_wr_id;
393 		wc.status = IB_WC_SUCCESS;
394 		wc.qp = &qp->ibqp;
395 		wc.src_qp = qp->remote_qpn;
396 		wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
397 		wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
398 		/* zero fields that are N/A */
399 		wc.vendor_err = 0;
400 		wc.pkey_index = 0;
401 		wc.dlid_path_bits = 0;
402 		wc.port_num = 0;
403 		/* Signal completion event if the solicited bit is set. */
404 		rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
405 		break;
406 
407 	case OP(RDMA_WRITE_FIRST):
408 	case OP(RDMA_WRITE_ONLY):
409 	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
410 rdma_first:
411 		if (unlikely(!(qp->qp_access_flags &
412 			       IB_ACCESS_REMOTE_WRITE))) {
413 			goto drop;
414 		}
415 		reth = &ohdr->u.rc.reth;
416 		hdrsize += sizeof(*reth);
417 		qp->r_len = be32_to_cpu(reth->length);
418 		qp->r_rcv_len = 0;
419 		qp->r_sge.sg_list = NULL;
420 		if (qp->r_len != 0) {
421 			u32 rkey = be32_to_cpu(reth->rkey);
422 			u64 vaddr = be64_to_cpu(reth->vaddr);
423 			int ok;
424 
425 			/* Check rkey */
426 			ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
427 					 vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
428 			if (unlikely(!ok))
429 				goto drop;
430 			qp->r_sge.num_sge = 1;
431 		} else {
432 			qp->r_sge.num_sge = 0;
433 			qp->r_sge.sge.mr = NULL;
434 			qp->r_sge.sge.vaddr = NULL;
435 			qp->r_sge.sge.length = 0;
436 			qp->r_sge.sge.sge_length = 0;
437 		}
438 		if (opcode == OP(RDMA_WRITE_ONLY))
439 			goto rdma_last;
440 		else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
441 			wc.ex.imm_data = ohdr->u.rc.imm_data;
442 			goto rdma_last_imm;
443 		}
444 		fallthrough;
445 	case OP(RDMA_WRITE_MIDDLE):
446 		/* Check for invalid length PMTU or posted rwqe len. */
447 		if (unlikely(tlen != (hdrsize + pmtu + 4)))
448 			goto drop;
449 		qp->r_rcv_len += pmtu;
450 		if (unlikely(qp->r_rcv_len > qp->r_len))
451 			goto drop;
452 		rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
453 		break;
454 
455 	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
456 		wc.ex.imm_data = ohdr->u.imm_data;
457 rdma_last_imm:
458 		hdrsize += 4;
459 		wc.wc_flags = IB_WC_WITH_IMM;
460 
461 		/* Get the number of bytes the message was padded by. */
462 		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
463 		/* Check for invalid length. */
464 		/* XXX LAST len should be >= 1 */
465 		if (unlikely(tlen < (hdrsize + pad + 4)))
466 			goto drop;
467 		/* Don't count the CRC. */
468 		tlen -= (hdrsize + pad + 4);
469 		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
470 			goto drop;
471 		if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
472 			rvt_put_ss(&qp->s_rdma_read_sge);
473 		else {
474 			ret = rvt_get_rwqe(qp, true);
475 			if (ret < 0)
476 				goto op_err;
477 			if (!ret)
478 				goto drop;
479 		}
480 		wc.byte_len = qp->r_len;
481 		wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
482 		rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
483 		rvt_put_ss(&qp->r_sge);
484 		goto last_imm;
485 
486 	case OP(RDMA_WRITE_LAST):
487 rdma_last:
488 		/* Get the number of bytes the message was padded by. */
489 		pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
490 		/* Check for invalid length. */
491 		/* XXX LAST len should be >= 1 */
492 		if (unlikely(tlen < (hdrsize + pad + 4)))
493 			goto drop;
494 		/* Don't count the CRC. */
495 		tlen -= (hdrsize + pad + 4);
496 		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
497 			goto drop;
498 		rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
499 		rvt_put_ss(&qp->r_sge);
500 		break;
501 
502 	default:
503 		/* Drop packet for unknown opcodes. */
504 		goto drop;
505 	}
506 	qp->r_psn++;
507 	qp->r_state = opcode;
508 	return;
509 
510 rewind:
511 	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
512 	qp->r_sge.num_sge = 0;
513 drop:
514 	ibp->rvp.n_pkt_drops++;
515 	return;
516 
517 op_err:
518 	rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
519 	return;
520 
521 }
522