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f931551b RC |
1 | /* |
2 | * Copyright (c) 2006, 2007, 2008, 2009 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 <linux/spinlock.h> | |
35 | ||
36 | #include "qib.h" | |
37 | #include "qib_mad.h" | |
38 | ||
39 | /* | |
40 | * Convert the AETH RNR timeout code into the number of microseconds. | |
41 | */ | |
42 | const u32 ib_qib_rnr_table[32] = { | |
43 | 655360, /* 00: 655.36 */ | |
44 | 10, /* 01: .01 */ | |
45 | 20, /* 02 .02 */ | |
46 | 30, /* 03: .03 */ | |
47 | 40, /* 04: .04 */ | |
48 | 60, /* 05: .06 */ | |
49 | 80, /* 06: .08 */ | |
50 | 120, /* 07: .12 */ | |
51 | 160, /* 08: .16 */ | |
52 | 240, /* 09: .24 */ | |
53 | 320, /* 0A: .32 */ | |
54 | 480, /* 0B: .48 */ | |
55 | 640, /* 0C: .64 */ | |
56 | 960, /* 0D: .96 */ | |
57 | 1280, /* 0E: 1.28 */ | |
58 | 1920, /* 0F: 1.92 */ | |
59 | 2560, /* 10: 2.56 */ | |
60 | 3840, /* 11: 3.84 */ | |
61 | 5120, /* 12: 5.12 */ | |
62 | 7680, /* 13: 7.68 */ | |
63 | 10240, /* 14: 10.24 */ | |
64 | 15360, /* 15: 15.36 */ | |
65 | 20480, /* 16: 20.48 */ | |
66 | 30720, /* 17: 30.72 */ | |
67 | 40960, /* 18: 40.96 */ | |
68 | 61440, /* 19: 61.44 */ | |
69 | 81920, /* 1A: 81.92 */ | |
70 | 122880, /* 1B: 122.88 */ | |
71 | 163840, /* 1C: 163.84 */ | |
72 | 245760, /* 1D: 245.76 */ | |
73 | 327680, /* 1E: 327.68 */ | |
74 | 491520 /* 1F: 491.52 */ | |
75 | }; | |
76 | ||
77 | /* | |
78 | * Validate a RWQE and fill in the SGE state. | |
79 | * Return 1 if OK. | |
80 | */ | |
81 | static int qib_init_sge(struct qib_qp *qp, struct qib_rwqe *wqe) | |
82 | { | |
83 | int i, j, ret; | |
84 | struct ib_wc wc; | |
85 | struct qib_lkey_table *rkt; | |
86 | struct qib_pd *pd; | |
87 | struct qib_sge_state *ss; | |
88 | ||
89 | rkt = &to_idev(qp->ibqp.device)->lk_table; | |
90 | pd = to_ipd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); | |
91 | ss = &qp->r_sge; | |
92 | ss->sg_list = qp->r_sg_list; | |
93 | qp->r_len = 0; | |
94 | for (i = j = 0; i < wqe->num_sge; i++) { | |
95 | if (wqe->sg_list[i].length == 0) | |
96 | continue; | |
97 | /* Check LKEY */ | |
98 | if (!qib_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, | |
99 | &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) | |
100 | goto bad_lkey; | |
101 | qp->r_len += wqe->sg_list[i].length; | |
102 | j++; | |
103 | } | |
104 | ss->num_sge = j; | |
105 | ss->total_len = qp->r_len; | |
106 | ret = 1; | |
107 | goto bail; | |
108 | ||
109 | bad_lkey: | |
110 | while (j) { | |
111 | struct qib_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; | |
112 | ||
113 | atomic_dec(&sge->mr->refcount); | |
114 | } | |
115 | ss->num_sge = 0; | |
116 | memset(&wc, 0, sizeof(wc)); | |
117 | wc.wr_id = wqe->wr_id; | |
118 | wc.status = IB_WC_LOC_PROT_ERR; | |
119 | wc.opcode = IB_WC_RECV; | |
120 | wc.qp = &qp->ibqp; | |
121 | /* Signal solicited completion event. */ | |
122 | qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); | |
123 | ret = 0; | |
124 | bail: | |
125 | return ret; | |
126 | } | |
127 | ||
128 | /** | |
129 | * qib_get_rwqe - copy the next RWQE into the QP's RWQE | |
130 | * @qp: the QP | |
131 | * @wr_id_only: update qp->r_wr_id only, not qp->r_sge | |
132 | * | |
133 | * Return -1 if there is a local error, 0 if no RWQE is available, | |
134 | * otherwise return 1. | |
135 | * | |
136 | * Can be called from interrupt level. | |
137 | */ | |
138 | int qib_get_rwqe(struct qib_qp *qp, int wr_id_only) | |
139 | { | |
140 | unsigned long flags; | |
141 | struct qib_rq *rq; | |
142 | struct qib_rwq *wq; | |
143 | struct qib_srq *srq; | |
144 | struct qib_rwqe *wqe; | |
145 | void (*handler)(struct ib_event *, void *); | |
146 | u32 tail; | |
147 | int ret; | |
148 | ||
149 | if (qp->ibqp.srq) { | |
150 | srq = to_isrq(qp->ibqp.srq); | |
151 | handler = srq->ibsrq.event_handler; | |
152 | rq = &srq->rq; | |
153 | } else { | |
154 | srq = NULL; | |
155 | handler = NULL; | |
156 | rq = &qp->r_rq; | |
157 | } | |
158 | ||
159 | spin_lock_irqsave(&rq->lock, flags); | |
160 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) { | |
161 | ret = 0; | |
162 | goto unlock; | |
163 | } | |
164 | ||
165 | wq = rq->wq; | |
166 | tail = wq->tail; | |
167 | /* Validate tail before using it since it is user writable. */ | |
168 | if (tail >= rq->size) | |
169 | tail = 0; | |
170 | if (unlikely(tail == wq->head)) { | |
171 | ret = 0; | |
172 | goto unlock; | |
173 | } | |
174 | /* Make sure entry is read after head index is read. */ | |
175 | smp_rmb(); | |
176 | wqe = get_rwqe_ptr(rq, tail); | |
177 | /* | |
178 | * Even though we update the tail index in memory, the verbs | |
179 | * consumer is not supposed to post more entries until a | |
180 | * completion is generated. | |
181 | */ | |
182 | if (++tail >= rq->size) | |
183 | tail = 0; | |
184 | wq->tail = tail; | |
185 | if (!wr_id_only && !qib_init_sge(qp, wqe)) { | |
186 | ret = -1; | |
187 | goto unlock; | |
188 | } | |
189 | qp->r_wr_id = wqe->wr_id; | |
190 | ||
191 | ret = 1; | |
192 | set_bit(QIB_R_WRID_VALID, &qp->r_aflags); | |
193 | if (handler) { | |
194 | u32 n; | |
195 | ||
196 | /* | |
197 | * Validate head pointer value and compute | |
198 | * the number of remaining WQEs. | |
199 | */ | |
200 | n = wq->head; | |
201 | if (n >= rq->size) | |
202 | n = 0; | |
203 | if (n < tail) | |
204 | n += rq->size - tail; | |
205 | else | |
206 | n -= tail; | |
207 | if (n < srq->limit) { | |
208 | struct ib_event ev; | |
209 | ||
210 | srq->limit = 0; | |
211 | spin_unlock_irqrestore(&rq->lock, flags); | |
212 | ev.device = qp->ibqp.device; | |
213 | ev.element.srq = qp->ibqp.srq; | |
214 | ev.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
215 | handler(&ev, srq->ibsrq.srq_context); | |
216 | goto bail; | |
217 | } | |
218 | } | |
219 | unlock: | |
220 | spin_unlock_irqrestore(&rq->lock, flags); | |
221 | bail: | |
222 | return ret; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Switch to alternate path. | |
227 | * The QP s_lock should be held and interrupts disabled. | |
228 | */ | |
229 | void qib_migrate_qp(struct qib_qp *qp) | |
230 | { | |
231 | struct ib_event ev; | |
232 | ||
233 | qp->s_mig_state = IB_MIG_MIGRATED; | |
234 | qp->remote_ah_attr = qp->alt_ah_attr; | |
235 | qp->port_num = qp->alt_ah_attr.port_num; | |
236 | qp->s_pkey_index = qp->s_alt_pkey_index; | |
237 | ||
238 | ev.device = qp->ibqp.device; | |
239 | ev.element.qp = &qp->ibqp; | |
240 | ev.event = IB_EVENT_PATH_MIG; | |
241 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
242 | } | |
243 | ||
244 | static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) | |
245 | { | |
246 | if (!index) { | |
247 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); | |
248 | ||
249 | return ppd->guid; | |
250 | } else | |
251 | return ibp->guids[index - 1]; | |
252 | } | |
253 | ||
254 | static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) | |
255 | { | |
256 | return (gid->global.interface_id == id && | |
257 | (gid->global.subnet_prefix == gid_prefix || | |
258 | gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); | |
259 | } | |
260 | ||
261 | /* | |
262 | * | |
9fd5473d MM |
263 | * This should be called with the QP r_lock held. |
264 | * | |
265 | * The s_lock will be acquired around the qib_migrate_qp() call. | |
f931551b RC |
266 | */ |
267 | int qib_ruc_check_hdr(struct qib_ibport *ibp, struct qib_ib_header *hdr, | |
268 | int has_grh, struct qib_qp *qp, u32 bth0) | |
269 | { | |
270 | __be64 guid; | |
9fd5473d | 271 | unsigned long flags; |
f931551b RC |
272 | |
273 | if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { | |
274 | if (!has_grh) { | |
275 | if (qp->alt_ah_attr.ah_flags & IB_AH_GRH) | |
276 | goto err; | |
277 | } else { | |
278 | if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH)) | |
279 | goto err; | |
280 | guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index); | |
281 | if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) | |
282 | goto err; | |
283 | if (!gid_ok(&hdr->u.l.grh.sgid, | |
284 | qp->alt_ah_attr.grh.dgid.global.subnet_prefix, | |
285 | qp->alt_ah_attr.grh.dgid.global.interface_id)) | |
286 | goto err; | |
287 | } | |
288 | if (!qib_pkey_ok((u16)bth0, | |
289 | qib_get_pkey(ibp, qp->s_alt_pkey_index))) { | |
290 | qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, | |
291 | (u16)bth0, | |
292 | (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, | |
293 | 0, qp->ibqp.qp_num, | |
294 | hdr->lrh[3], hdr->lrh[1]); | |
295 | goto err; | |
296 | } | |
297 | /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ | |
298 | if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid || | |
299 | ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num) | |
300 | goto err; | |
9fd5473d | 301 | spin_lock_irqsave(&qp->s_lock, flags); |
f931551b | 302 | qib_migrate_qp(qp); |
9fd5473d | 303 | spin_unlock_irqrestore(&qp->s_lock, flags); |
f931551b RC |
304 | } else { |
305 | if (!has_grh) { | |
306 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) | |
307 | goto err; | |
308 | } else { | |
309 | if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) | |
310 | goto err; | |
311 | guid = get_sguid(ibp, | |
312 | qp->remote_ah_attr.grh.sgid_index); | |
313 | if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) | |
314 | goto err; | |
315 | if (!gid_ok(&hdr->u.l.grh.sgid, | |
316 | qp->remote_ah_attr.grh.dgid.global.subnet_prefix, | |
317 | qp->remote_ah_attr.grh.dgid.global.interface_id)) | |
318 | goto err; | |
319 | } | |
320 | if (!qib_pkey_ok((u16)bth0, | |
321 | qib_get_pkey(ibp, qp->s_pkey_index))) { | |
322 | qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, | |
323 | (u16)bth0, | |
324 | (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, | |
325 | 0, qp->ibqp.qp_num, | |
326 | hdr->lrh[3], hdr->lrh[1]); | |
327 | goto err; | |
328 | } | |
329 | /* Validate the SLID. See Ch. 9.6.1.5 */ | |
330 | if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid || | |
331 | ppd_from_ibp(ibp)->port != qp->port_num) | |
332 | goto err; | |
333 | if (qp->s_mig_state == IB_MIG_REARM && | |
334 | !(bth0 & IB_BTH_MIG_REQ)) | |
335 | qp->s_mig_state = IB_MIG_ARMED; | |
336 | } | |
337 | ||
338 | return 0; | |
339 | ||
340 | err: | |
341 | return 1; | |
342 | } | |
343 | ||
344 | /** | |
345 | * qib_ruc_loopback - handle UC and RC lookback requests | |
346 | * @sqp: the sending QP | |
347 | * | |
348 | * This is called from qib_do_send() to | |
349 | * forward a WQE addressed to the same HCA. | |
350 | * Note that although we are single threaded due to the tasklet, we still | |
351 | * have to protect against post_send(). We don't have to worry about | |
352 | * receive interrupts since this is a connected protocol and all packets | |
353 | * will pass through here. | |
354 | */ | |
355 | static void qib_ruc_loopback(struct qib_qp *sqp) | |
356 | { | |
357 | struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); | |
358 | struct qib_qp *qp; | |
359 | struct qib_swqe *wqe; | |
360 | struct qib_sge *sge; | |
361 | unsigned long flags; | |
362 | struct ib_wc wc; | |
363 | u64 sdata; | |
364 | atomic64_t *maddr; | |
365 | enum ib_wc_status send_status; | |
366 | int release; | |
367 | int ret; | |
368 | ||
369 | /* | |
370 | * Note that we check the responder QP state after | |
371 | * checking the requester's state. | |
372 | */ | |
373 | qp = qib_lookup_qpn(ibp, sqp->remote_qpn); | |
374 | ||
375 | spin_lock_irqsave(&sqp->s_lock, flags); | |
376 | ||
377 | /* Return if we are already busy processing a work request. */ | |
378 | if ((sqp->s_flags & (QIB_S_BUSY | QIB_S_ANY_WAIT)) || | |
379 | !(ib_qib_state_ops[sqp->state] & QIB_PROCESS_OR_FLUSH_SEND)) | |
380 | goto unlock; | |
381 | ||
382 | sqp->s_flags |= QIB_S_BUSY; | |
383 | ||
384 | again: | |
385 | if (sqp->s_last == sqp->s_head) | |
386 | goto clr_busy; | |
387 | wqe = get_swqe_ptr(sqp, sqp->s_last); | |
388 | ||
389 | /* Return if it is not OK to start a new work reqeust. */ | |
390 | if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_NEXT_SEND_OK)) { | |
391 | if (!(ib_qib_state_ops[sqp->state] & QIB_FLUSH_SEND)) | |
392 | goto clr_busy; | |
393 | /* We are in the error state, flush the work request. */ | |
394 | send_status = IB_WC_WR_FLUSH_ERR; | |
395 | goto flush_send; | |
396 | } | |
397 | ||
398 | /* | |
399 | * We can rely on the entry not changing without the s_lock | |
400 | * being held until we update s_last. | |
401 | * We increment s_cur to indicate s_last is in progress. | |
402 | */ | |
403 | if (sqp->s_last == sqp->s_cur) { | |
404 | if (++sqp->s_cur >= sqp->s_size) | |
405 | sqp->s_cur = 0; | |
406 | } | |
407 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
408 | ||
409 | if (!qp || !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) || | |
410 | qp->ibqp.qp_type != sqp->ibqp.qp_type) { | |
411 | ibp->n_pkt_drops++; | |
412 | /* | |
413 | * For RC, the requester would timeout and retry so | |
414 | * shortcut the timeouts and just signal too many retries. | |
415 | */ | |
416 | if (sqp->ibqp.qp_type == IB_QPT_RC) | |
417 | send_status = IB_WC_RETRY_EXC_ERR; | |
418 | else | |
419 | send_status = IB_WC_SUCCESS; | |
420 | goto serr; | |
421 | } | |
422 | ||
423 | memset(&wc, 0, sizeof wc); | |
424 | send_status = IB_WC_SUCCESS; | |
425 | ||
426 | release = 1; | |
427 | sqp->s_sge.sge = wqe->sg_list[0]; | |
428 | sqp->s_sge.sg_list = wqe->sg_list + 1; | |
429 | sqp->s_sge.num_sge = wqe->wr.num_sge; | |
430 | sqp->s_len = wqe->length; | |
431 | switch (wqe->wr.opcode) { | |
432 | case IB_WR_SEND_WITH_IMM: | |
433 | wc.wc_flags = IB_WC_WITH_IMM; | |
434 | wc.ex.imm_data = wqe->wr.ex.imm_data; | |
435 | /* FALLTHROUGH */ | |
436 | case IB_WR_SEND: | |
437 | ret = qib_get_rwqe(qp, 0); | |
438 | if (ret < 0) | |
439 | goto op_err; | |
440 | if (!ret) | |
441 | goto rnr_nak; | |
442 | break; | |
443 | ||
444 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
445 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
446 | goto inv_err; | |
447 | wc.wc_flags = IB_WC_WITH_IMM; | |
448 | wc.ex.imm_data = wqe->wr.ex.imm_data; | |
449 | ret = qib_get_rwqe(qp, 1); | |
450 | if (ret < 0) | |
451 | goto op_err; | |
452 | if (!ret) | |
453 | goto rnr_nak; | |
454 | /* FALLTHROUGH */ | |
455 | case IB_WR_RDMA_WRITE: | |
456 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
457 | goto inv_err; | |
458 | if (wqe->length == 0) | |
459 | break; | |
460 | if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, wqe->length, | |
461 | wqe->wr.wr.rdma.remote_addr, | |
462 | wqe->wr.wr.rdma.rkey, | |
463 | IB_ACCESS_REMOTE_WRITE))) | |
464 | goto acc_err; | |
465 | qp->r_sge.sg_list = NULL; | |
466 | qp->r_sge.num_sge = 1; | |
467 | qp->r_sge.total_len = wqe->length; | |
468 | break; | |
469 | ||
470 | case IB_WR_RDMA_READ: | |
471 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
472 | goto inv_err; | |
473 | if (unlikely(!qib_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, | |
474 | wqe->wr.wr.rdma.remote_addr, | |
475 | wqe->wr.wr.rdma.rkey, | |
476 | IB_ACCESS_REMOTE_READ))) | |
477 | goto acc_err; | |
478 | release = 0; | |
479 | sqp->s_sge.sg_list = NULL; | |
480 | sqp->s_sge.num_sge = 1; | |
481 | qp->r_sge.sge = wqe->sg_list[0]; | |
482 | qp->r_sge.sg_list = wqe->sg_list + 1; | |
483 | qp->r_sge.num_sge = wqe->wr.num_sge; | |
484 | qp->r_sge.total_len = wqe->length; | |
485 | break; | |
486 | ||
487 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
488 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
489 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) | |
490 | goto inv_err; | |
491 | if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), | |
492 | wqe->wr.wr.atomic.remote_addr, | |
493 | wqe->wr.wr.atomic.rkey, | |
494 | IB_ACCESS_REMOTE_ATOMIC))) | |
495 | goto acc_err; | |
496 | /* Perform atomic OP and save result. */ | |
497 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; | |
498 | sdata = wqe->wr.wr.atomic.compare_add; | |
499 | *(u64 *) sqp->s_sge.sge.vaddr = | |
500 | (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? | |
501 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
502 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
503 | sdata, wqe->wr.wr.atomic.swap); | |
504 | atomic_dec(&qp->r_sge.sge.mr->refcount); | |
505 | qp->r_sge.num_sge = 0; | |
506 | goto send_comp; | |
507 | ||
508 | default: | |
509 | send_status = IB_WC_LOC_QP_OP_ERR; | |
510 | goto serr; | |
511 | } | |
512 | ||
513 | sge = &sqp->s_sge.sge; | |
514 | while (sqp->s_len) { | |
515 | u32 len = sqp->s_len; | |
516 | ||
517 | if (len > sge->length) | |
518 | len = sge->length; | |
519 | if (len > sge->sge_length) | |
520 | len = sge->sge_length; | |
521 | BUG_ON(len == 0); | |
522 | qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); | |
523 | sge->vaddr += len; | |
524 | sge->length -= len; | |
525 | sge->sge_length -= len; | |
526 | if (sge->sge_length == 0) { | |
527 | if (!release) | |
528 | atomic_dec(&sge->mr->refcount); | |
529 | if (--sqp->s_sge.num_sge) | |
530 | *sge = *sqp->s_sge.sg_list++; | |
531 | } else if (sge->length == 0 && sge->mr->lkey) { | |
532 | if (++sge->n >= QIB_SEGSZ) { | |
533 | if (++sge->m >= sge->mr->mapsz) | |
534 | break; | |
535 | sge->n = 0; | |
536 | } | |
537 | sge->vaddr = | |
538 | sge->mr->map[sge->m]->segs[sge->n].vaddr; | |
539 | sge->length = | |
540 | sge->mr->map[sge->m]->segs[sge->n].length; | |
541 | } | |
542 | sqp->s_len -= len; | |
543 | } | |
544 | if (release) | |
545 | while (qp->r_sge.num_sge) { | |
546 | atomic_dec(&qp->r_sge.sge.mr->refcount); | |
547 | if (--qp->r_sge.num_sge) | |
548 | qp->r_sge.sge = *qp->r_sge.sg_list++; | |
549 | } | |
550 | ||
551 | if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) | |
552 | goto send_comp; | |
553 | ||
554 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) | |
555 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
556 | else | |
557 | wc.opcode = IB_WC_RECV; | |
558 | wc.wr_id = qp->r_wr_id; | |
559 | wc.status = IB_WC_SUCCESS; | |
560 | wc.byte_len = wqe->length; | |
561 | wc.qp = &qp->ibqp; | |
562 | wc.src_qp = qp->remote_qpn; | |
563 | wc.slid = qp->remote_ah_attr.dlid; | |
564 | wc.sl = qp->remote_ah_attr.sl; | |
565 | wc.port_num = 1; | |
566 | /* Signal completion event if the solicited bit is set. */ | |
567 | qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
568 | wqe->wr.send_flags & IB_SEND_SOLICITED); | |
569 | ||
570 | send_comp: | |
571 | spin_lock_irqsave(&sqp->s_lock, flags); | |
572 | ibp->n_loop_pkts++; | |
573 | flush_send: | |
574 | sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; | |
575 | qib_send_complete(sqp, wqe, send_status); | |
576 | goto again; | |
577 | ||
578 | rnr_nak: | |
579 | /* Handle RNR NAK */ | |
580 | if (qp->ibqp.qp_type == IB_QPT_UC) | |
581 | goto send_comp; | |
582 | ibp->n_rnr_naks++; | |
583 | /* | |
584 | * Note: we don't need the s_lock held since the BUSY flag | |
585 | * makes this single threaded. | |
586 | */ | |
587 | if (sqp->s_rnr_retry == 0) { | |
588 | send_status = IB_WC_RNR_RETRY_EXC_ERR; | |
589 | goto serr; | |
590 | } | |
591 | if (sqp->s_rnr_retry_cnt < 7) | |
592 | sqp->s_rnr_retry--; | |
593 | spin_lock_irqsave(&sqp->s_lock, flags); | |
594 | if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_RECV_OK)) | |
595 | goto clr_busy; | |
596 | sqp->s_flags |= QIB_S_WAIT_RNR; | |
597 | sqp->s_timer.function = qib_rc_rnr_retry; | |
598 | sqp->s_timer.expires = jiffies + | |
599 | usecs_to_jiffies(ib_qib_rnr_table[qp->r_min_rnr_timer]); | |
600 | add_timer(&sqp->s_timer); | |
601 | goto clr_busy; | |
602 | ||
603 | op_err: | |
604 | send_status = IB_WC_REM_OP_ERR; | |
605 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
606 | goto err; | |
607 | ||
608 | inv_err: | |
609 | send_status = IB_WC_REM_INV_REQ_ERR; | |
610 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
611 | goto err; | |
612 | ||
613 | acc_err: | |
614 | send_status = IB_WC_REM_ACCESS_ERR; | |
615 | wc.status = IB_WC_LOC_PROT_ERR; | |
616 | err: | |
617 | /* responder goes to error state */ | |
618 | qib_rc_error(qp, wc.status); | |
619 | ||
620 | serr: | |
621 | spin_lock_irqsave(&sqp->s_lock, flags); | |
622 | qib_send_complete(sqp, wqe, send_status); | |
623 | if (sqp->ibqp.qp_type == IB_QPT_RC) { | |
624 | int lastwqe = qib_error_qp(sqp, IB_WC_WR_FLUSH_ERR); | |
625 | ||
626 | sqp->s_flags &= ~QIB_S_BUSY; | |
627 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
628 | if (lastwqe) { | |
629 | struct ib_event ev; | |
630 | ||
631 | ev.device = sqp->ibqp.device; | |
632 | ev.element.qp = &sqp->ibqp; | |
633 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
634 | sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); | |
635 | } | |
636 | goto done; | |
637 | } | |
638 | clr_busy: | |
639 | sqp->s_flags &= ~QIB_S_BUSY; | |
640 | unlock: | |
641 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
642 | done: | |
643 | if (qp && atomic_dec_and_test(&qp->refcount)) | |
644 | wake_up(&qp->wait); | |
645 | } | |
646 | ||
647 | /** | |
648 | * qib_make_grh - construct a GRH header | |
649 | * @ibp: a pointer to the IB port | |
650 | * @hdr: a pointer to the GRH header being constructed | |
651 | * @grh: the global route address to send to | |
652 | * @hwords: the number of 32 bit words of header being sent | |
653 | * @nwords: the number of 32 bit words of data being sent | |
654 | * | |
655 | * Return the size of the header in 32 bit words. | |
656 | */ | |
657 | u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, | |
658 | struct ib_global_route *grh, u32 hwords, u32 nwords) | |
659 | { | |
660 | hdr->version_tclass_flow = | |
661 | cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | | |
662 | (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | | |
663 | (grh->flow_label << IB_GRH_FLOW_SHIFT)); | |
664 | hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); | |
665 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ | |
666 | hdr->next_hdr = IB_GRH_NEXT_HDR; | |
667 | hdr->hop_limit = grh->hop_limit; | |
668 | /* The SGID is 32-bit aligned. */ | |
669 | hdr->sgid.global.subnet_prefix = ibp->gid_prefix; | |
670 | hdr->sgid.global.interface_id = grh->sgid_index ? | |
671 | ibp->guids[grh->sgid_index - 1] : ppd_from_ibp(ibp)->guid; | |
672 | hdr->dgid = grh->dgid; | |
673 | ||
674 | /* GRH header size in 32-bit words. */ | |
675 | return sizeof(struct ib_grh) / sizeof(u32); | |
676 | } | |
677 | ||
678 | void qib_make_ruc_header(struct qib_qp *qp, struct qib_other_headers *ohdr, | |
679 | u32 bth0, u32 bth2) | |
680 | { | |
681 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
682 | u16 lrh0; | |
683 | u32 nwords; | |
684 | u32 extra_bytes; | |
685 | ||
686 | /* Construct the header. */ | |
687 | extra_bytes = -qp->s_cur_size & 3; | |
688 | nwords = (qp->s_cur_size + extra_bytes) >> 2; | |
689 | lrh0 = QIB_LRH_BTH; | |
690 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
1c94283d | 691 | qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr->u.l.grh, |
f931551b RC |
692 | &qp->remote_ah_attr.grh, |
693 | qp->s_hdrwords, nwords); | |
694 | lrh0 = QIB_LRH_GRH; | |
695 | } | |
696 | lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | | |
697 | qp->remote_ah_attr.sl << 4; | |
1c94283d MM |
698 | qp->s_hdr->lrh[0] = cpu_to_be16(lrh0); |
699 | qp->s_hdr->lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
700 | qp->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); | |
701 | qp->s_hdr->lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | | |
f931551b RC |
702 | qp->remote_ah_attr.src_path_bits); |
703 | bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); | |
704 | bth0 |= extra_bytes << 20; | |
705 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
706 | bth0 |= IB_BTH_MIG_REQ; | |
707 | ohdr->bth[0] = cpu_to_be32(bth0); | |
708 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
709 | ohdr->bth[2] = cpu_to_be32(bth2); | |
710 | } | |
711 | ||
712 | /** | |
713 | * qib_do_send - perform a send on a QP | |
714 | * @work: contains a pointer to the QP | |
715 | * | |
716 | * Process entries in the send work queue until credit or queue is | |
717 | * exhausted. Only allow one CPU to send a packet per QP (tasklet). | |
718 | * Otherwise, two threads could send packets out of order. | |
719 | */ | |
720 | void qib_do_send(struct work_struct *work) | |
721 | { | |
722 | struct qib_qp *qp = container_of(work, struct qib_qp, s_work); | |
723 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
724 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); | |
725 | int (*make_req)(struct qib_qp *qp); | |
726 | unsigned long flags; | |
727 | ||
728 | if ((qp->ibqp.qp_type == IB_QPT_RC || | |
729 | qp->ibqp.qp_type == IB_QPT_UC) && | |
730 | (qp->remote_ah_attr.dlid & ~((1 << ppd->lmc) - 1)) == ppd->lid) { | |
731 | qib_ruc_loopback(qp); | |
732 | return; | |
733 | } | |
734 | ||
735 | if (qp->ibqp.qp_type == IB_QPT_RC) | |
736 | make_req = qib_make_rc_req; | |
737 | else if (qp->ibqp.qp_type == IB_QPT_UC) | |
738 | make_req = qib_make_uc_req; | |
739 | else | |
740 | make_req = qib_make_ud_req; | |
741 | ||
742 | spin_lock_irqsave(&qp->s_lock, flags); | |
743 | ||
744 | /* Return if we are already busy processing a work request. */ | |
745 | if (!qib_send_ok(qp)) { | |
746 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
747 | return; | |
748 | } | |
749 | ||
750 | qp->s_flags |= QIB_S_BUSY; | |
751 | ||
752 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
753 | ||
754 | do { | |
755 | /* Check for a constructed packet to be sent. */ | |
756 | if (qp->s_hdrwords != 0) { | |
757 | /* | |
758 | * If the packet cannot be sent now, return and | |
759 | * the send tasklet will be woken up later. | |
760 | */ | |
1c94283d | 761 | if (qib_verbs_send(qp, qp->s_hdr, qp->s_hdrwords, |
f931551b RC |
762 | qp->s_cur_sge, qp->s_cur_size)) |
763 | break; | |
764 | /* Record that s_hdr is empty. */ | |
765 | qp->s_hdrwords = 0; | |
766 | } | |
767 | } while (make_req(qp)); | |
768 | } | |
769 | ||
770 | /* | |
771 | * This should be called with s_lock held. | |
772 | */ | |
773 | void qib_send_complete(struct qib_qp *qp, struct qib_swqe *wqe, | |
774 | enum ib_wc_status status) | |
775 | { | |
776 | u32 old_last, last; | |
777 | unsigned i; | |
778 | ||
779 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND)) | |
780 | return; | |
781 | ||
782 | for (i = 0; i < wqe->wr.num_sge; i++) { | |
783 | struct qib_sge *sge = &wqe->sg_list[i]; | |
784 | ||
785 | atomic_dec(&sge->mr->refcount); | |
786 | } | |
787 | if (qp->ibqp.qp_type == IB_QPT_UD || | |
788 | qp->ibqp.qp_type == IB_QPT_SMI || | |
789 | qp->ibqp.qp_type == IB_QPT_GSI) | |
790 | atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount); | |
791 | ||
792 | /* See ch. 11.2.4.1 and 10.7.3.1 */ | |
793 | if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || | |
794 | (wqe->wr.send_flags & IB_SEND_SIGNALED) || | |
795 | status != IB_WC_SUCCESS) { | |
796 | struct ib_wc wc; | |
797 | ||
798 | memset(&wc, 0, sizeof wc); | |
799 | wc.wr_id = wqe->wr.wr_id; | |
800 | wc.status = status; | |
801 | wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; | |
802 | wc.qp = &qp->ibqp; | |
803 | if (status == IB_WC_SUCCESS) | |
804 | wc.byte_len = wqe->length; | |
805 | qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, | |
806 | status != IB_WC_SUCCESS); | |
807 | } | |
808 | ||
809 | last = qp->s_last; | |
810 | old_last = last; | |
811 | if (++last >= qp->s_size) | |
812 | last = 0; | |
813 | qp->s_last = last; | |
814 | if (qp->s_acked == old_last) | |
815 | qp->s_acked = last; | |
816 | if (qp->s_cur == old_last) | |
817 | qp->s_cur = last; | |
818 | if (qp->s_tail == old_last) | |
819 | qp->s_tail = last; | |
820 | if (qp->state == IB_QPS_SQD && last == qp->s_cur) | |
821 | qp->s_draining = 0; | |
822 | } |