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