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77241056 MM |
1 | /* |
2 | * | |
3 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
4 | * redistributing this file, you may do so under either license. | |
5 | * | |
6 | * GPL LICENSE SUMMARY | |
7 | * | |
8 | * Copyright(c) 2015 Intel Corporation. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of version 2 of the GNU General Public License as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * BSD LICENSE | |
20 | * | |
21 | * Copyright(c) 2015 Intel Corporation. | |
22 | * | |
23 | * Redistribution and use in source and binary forms, with or without | |
24 | * modification, are permitted provided that the following conditions | |
25 | * are met: | |
26 | * | |
27 | * - Redistributions of source code must retain the above copyright | |
28 | * notice, this list of conditions and the following disclaimer. | |
29 | * - Redistributions in binary form must reproduce the above copyright | |
30 | * notice, this list of conditions and the following disclaimer in | |
31 | * the documentation and/or other materials provided with the | |
32 | * distribution. | |
33 | * - Neither the name of Intel Corporation nor the names of its | |
34 | * contributors may be used to endorse or promote products derived | |
35 | * from this software without specific prior written permission. | |
36 | * | |
37 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
38 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
39 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
40 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
41 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
42 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
43 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
44 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
45 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 | * | |
49 | */ | |
50 | ||
51 | #include <linux/spinlock.h> | |
52 | ||
53 | #include "hfi.h" | |
54 | #include "mad.h" | |
55 | #include "qp.h" | |
56 | #include "sdma.h" | |
57 | ||
58 | /* | |
59 | * Convert the AETH RNR timeout code into the number of microseconds. | |
60 | */ | |
61 | const u32 ib_hfi1_rnr_table[32] = { | |
62 | 655360, /* 00: 655.36 */ | |
63 | 10, /* 01: .01 */ | |
64 | 20, /* 02 .02 */ | |
65 | 30, /* 03: .03 */ | |
66 | 40, /* 04: .04 */ | |
67 | 60, /* 05: .06 */ | |
68 | 80, /* 06: .08 */ | |
69 | 120, /* 07: .12 */ | |
70 | 160, /* 08: .16 */ | |
71 | 240, /* 09: .24 */ | |
72 | 320, /* 0A: .32 */ | |
73 | 480, /* 0B: .48 */ | |
74 | 640, /* 0C: .64 */ | |
75 | 960, /* 0D: .96 */ | |
76 | 1280, /* 0E: 1.28 */ | |
77 | 1920, /* 0F: 1.92 */ | |
78 | 2560, /* 10: 2.56 */ | |
79 | 3840, /* 11: 3.84 */ | |
80 | 5120, /* 12: 5.12 */ | |
81 | 7680, /* 13: 7.68 */ | |
82 | 10240, /* 14: 10.24 */ | |
83 | 15360, /* 15: 15.36 */ | |
84 | 20480, /* 16: 20.48 */ | |
85 | 30720, /* 17: 30.72 */ | |
86 | 40960, /* 18: 40.96 */ | |
87 | 61440, /* 19: 61.44 */ | |
88 | 81920, /* 1A: 81.92 */ | |
89 | 122880, /* 1B: 122.88 */ | |
90 | 163840, /* 1C: 163.84 */ | |
91 | 245760, /* 1D: 245.76 */ | |
92 | 327680, /* 1E: 327.68 */ | |
93 | 491520 /* 1F: 491.52 */ | |
94 | }; | |
95 | ||
96 | /* | |
97 | * Validate a RWQE and fill in the SGE state. | |
98 | * Return 1 if OK. | |
99 | */ | |
100 | static int init_sge(struct hfi1_qp *qp, struct hfi1_rwqe *wqe) | |
101 | { | |
102 | int i, j, ret; | |
103 | struct ib_wc wc; | |
104 | struct hfi1_lkey_table *rkt; | |
105 | struct hfi1_pd *pd; | |
106 | struct hfi1_sge_state *ss; | |
107 | ||
108 | rkt = &to_idev(qp->ibqp.device)->lk_table; | |
109 | pd = to_ipd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); | |
110 | ss = &qp->r_sge; | |
111 | ss->sg_list = qp->r_sg_list; | |
112 | qp->r_len = 0; | |
113 | for (i = j = 0; i < wqe->num_sge; i++) { | |
114 | if (wqe->sg_list[i].length == 0) | |
115 | continue; | |
116 | /* Check LKEY */ | |
117 | if (!hfi1_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, | |
118 | &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) | |
119 | goto bad_lkey; | |
120 | qp->r_len += wqe->sg_list[i].length; | |
121 | j++; | |
122 | } | |
123 | ss->num_sge = j; | |
124 | ss->total_len = qp->r_len; | |
125 | ret = 1; | |
126 | goto bail; | |
127 | ||
128 | bad_lkey: | |
129 | while (j) { | |
130 | struct hfi1_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; | |
131 | ||
132 | hfi1_put_mr(sge->mr); | |
133 | } | |
134 | ss->num_sge = 0; | |
135 | memset(&wc, 0, sizeof(wc)); | |
136 | wc.wr_id = wqe->wr_id; | |
137 | wc.status = IB_WC_LOC_PROT_ERR; | |
138 | wc.opcode = IB_WC_RECV; | |
139 | wc.qp = &qp->ibqp; | |
140 | /* Signal solicited completion event. */ | |
141 | hfi1_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); | |
142 | ret = 0; | |
143 | bail: | |
144 | return ret; | |
145 | } | |
146 | ||
147 | /** | |
148 | * hfi1_get_rwqe - copy the next RWQE into the QP's RWQE | |
149 | * @qp: the QP | |
150 | * @wr_id_only: update qp->r_wr_id only, not qp->r_sge | |
151 | * | |
152 | * Return -1 if there is a local error, 0 if no RWQE is available, | |
153 | * otherwise return 1. | |
154 | * | |
155 | * Can be called from interrupt level. | |
156 | */ | |
157 | int hfi1_get_rwqe(struct hfi1_qp *qp, int wr_id_only) | |
158 | { | |
159 | unsigned long flags; | |
160 | struct hfi1_rq *rq; | |
161 | struct hfi1_rwq *wq; | |
162 | struct hfi1_srq *srq; | |
163 | struct hfi1_rwqe *wqe; | |
164 | void (*handler)(struct ib_event *, void *); | |
165 | u32 tail; | |
166 | int ret; | |
167 | ||
168 | if (qp->ibqp.srq) { | |
169 | srq = to_isrq(qp->ibqp.srq); | |
170 | handler = srq->ibsrq.event_handler; | |
171 | rq = &srq->rq; | |
172 | } else { | |
173 | srq = NULL; | |
174 | handler = NULL; | |
175 | rq = &qp->r_rq; | |
176 | } | |
177 | ||
178 | spin_lock_irqsave(&rq->lock, flags); | |
179 | if (!(ib_hfi1_state_ops[qp->state] & HFI1_PROCESS_RECV_OK)) { | |
180 | ret = 0; | |
181 | goto unlock; | |
182 | } | |
183 | ||
184 | wq = rq->wq; | |
185 | tail = wq->tail; | |
186 | /* Validate tail before using it since it is user writable. */ | |
187 | if (tail >= rq->size) | |
188 | tail = 0; | |
189 | if (unlikely(tail == wq->head)) { | |
190 | ret = 0; | |
191 | goto unlock; | |
192 | } | |
193 | /* Make sure entry is read after head index is read. */ | |
194 | smp_rmb(); | |
195 | wqe = get_rwqe_ptr(rq, tail); | |
196 | /* | |
197 | * Even though we update the tail index in memory, the verbs | |
198 | * consumer is not supposed to post more entries until a | |
199 | * completion is generated. | |
200 | */ | |
201 | if (++tail >= rq->size) | |
202 | tail = 0; | |
203 | wq->tail = tail; | |
204 | if (!wr_id_only && !init_sge(qp, wqe)) { | |
205 | ret = -1; | |
206 | goto unlock; | |
207 | } | |
208 | qp->r_wr_id = wqe->wr_id; | |
209 | ||
210 | ret = 1; | |
211 | set_bit(HFI1_R_WRID_VALID, &qp->r_aflags); | |
212 | if (handler) { | |
213 | u32 n; | |
214 | ||
215 | /* | |
216 | * Validate head pointer value and compute | |
217 | * the number of remaining WQEs. | |
218 | */ | |
219 | n = wq->head; | |
220 | if (n >= rq->size) | |
221 | n = 0; | |
222 | if (n < tail) | |
223 | n += rq->size - tail; | |
224 | else | |
225 | n -= tail; | |
226 | if (n < srq->limit) { | |
227 | struct ib_event ev; | |
228 | ||
229 | srq->limit = 0; | |
230 | spin_unlock_irqrestore(&rq->lock, flags); | |
231 | ev.device = qp->ibqp.device; | |
232 | ev.element.srq = qp->ibqp.srq; | |
233 | ev.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
234 | handler(&ev, srq->ibsrq.srq_context); | |
235 | goto bail; | |
236 | } | |
237 | } | |
238 | unlock: | |
239 | spin_unlock_irqrestore(&rq->lock, flags); | |
240 | bail: | |
241 | return ret; | |
242 | } | |
243 | ||
244 | /* | |
245 | * Switch to alternate path. | |
246 | * The QP s_lock should be held and interrupts disabled. | |
247 | */ | |
248 | void hfi1_migrate_qp(struct hfi1_qp *qp) | |
249 | { | |
250 | struct ib_event ev; | |
251 | ||
252 | qp->s_mig_state = IB_MIG_MIGRATED; | |
253 | qp->remote_ah_attr = qp->alt_ah_attr; | |
254 | qp->port_num = qp->alt_ah_attr.port_num; | |
255 | qp->s_pkey_index = qp->s_alt_pkey_index; | |
256 | qp->s_flags |= HFI1_S_AHG_CLEAR; | |
257 | ||
258 | ev.device = qp->ibqp.device; | |
259 | ev.element.qp = &qp->ibqp; | |
260 | ev.event = IB_EVENT_PATH_MIG; | |
261 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
262 | } | |
263 | ||
264 | static __be64 get_sguid(struct hfi1_ibport *ibp, unsigned index) | |
265 | { | |
266 | if (!index) { | |
267 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); | |
268 | ||
269 | return cpu_to_be64(ppd->guid); | |
270 | } | |
271 | return ibp->guids[index - 1]; | |
272 | } | |
273 | ||
274 | static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) | |
275 | { | |
276 | return (gid->global.interface_id == id && | |
277 | (gid->global.subnet_prefix == gid_prefix || | |
278 | gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); | |
279 | } | |
280 | ||
281 | /* | |
282 | * | |
283 | * This should be called with the QP r_lock held. | |
284 | * | |
285 | * The s_lock will be acquired around the hfi1_migrate_qp() call. | |
286 | */ | |
287 | int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_ib_header *hdr, | |
288 | int has_grh, struct hfi1_qp *qp, u32 bth0) | |
289 | { | |
290 | __be64 guid; | |
291 | unsigned long flags; | |
292 | u8 sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; | |
293 | ||
294 | if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { | |
295 | if (!has_grh) { | |
296 | if (qp->alt_ah_attr.ah_flags & IB_AH_GRH) | |
297 | goto err; | |
298 | } else { | |
299 | if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH)) | |
300 | goto err; | |
301 | guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index); | |
302 | if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) | |
303 | goto err; | |
304 | if (!gid_ok(&hdr->u.l.grh.sgid, | |
305 | qp->alt_ah_attr.grh.dgid.global.subnet_prefix, | |
306 | qp->alt_ah_attr.grh.dgid.global.interface_id)) | |
307 | goto err; | |
308 | } | |
309 | if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), (u16)bth0, | |
310 | sc5, be16_to_cpu(hdr->lrh[3])))) { | |
311 | hfi1_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, | |
312 | (u16)bth0, | |
313 | (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, | |
314 | 0, qp->ibqp.qp_num, | |
315 | hdr->lrh[3], hdr->lrh[1]); | |
316 | goto err; | |
317 | } | |
318 | /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ | |
319 | if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid || | |
320 | ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num) | |
321 | goto err; | |
322 | spin_lock_irqsave(&qp->s_lock, flags); | |
323 | hfi1_migrate_qp(qp); | |
324 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
325 | } else { | |
326 | if (!has_grh) { | |
327 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) | |
328 | goto err; | |
329 | } else { | |
330 | if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) | |
331 | goto err; | |
332 | guid = get_sguid(ibp, | |
333 | qp->remote_ah_attr.grh.sgid_index); | |
334 | if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) | |
335 | goto err; | |
336 | if (!gid_ok(&hdr->u.l.grh.sgid, | |
337 | qp->remote_ah_attr.grh.dgid.global.subnet_prefix, | |
338 | qp->remote_ah_attr.grh.dgid.global.interface_id)) | |
339 | goto err; | |
340 | } | |
341 | if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), (u16)bth0, | |
342 | sc5, be16_to_cpu(hdr->lrh[3])))) { | |
343 | hfi1_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, | |
344 | (u16)bth0, | |
345 | (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, | |
346 | 0, qp->ibqp.qp_num, | |
347 | hdr->lrh[3], hdr->lrh[1]); | |
348 | goto err; | |
349 | } | |
350 | /* Validate the SLID. See Ch. 9.6.1.5 */ | |
351 | if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid || | |
352 | ppd_from_ibp(ibp)->port != qp->port_num) | |
353 | goto err; | |
354 | if (qp->s_mig_state == IB_MIG_REARM && | |
355 | !(bth0 & IB_BTH_MIG_REQ)) | |
356 | qp->s_mig_state = IB_MIG_ARMED; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | ||
361 | err: | |
362 | return 1; | |
363 | } | |
364 | ||
365 | /** | |
366 | * ruc_loopback - handle UC and RC loopback requests | |
367 | * @sqp: the sending QP | |
368 | * | |
369 | * This is called from hfi1_do_send() to | |
370 | * forward a WQE addressed to the same HFI. | |
371 | * Note that although we are single threaded due to the tasklet, we still | |
372 | * have to protect against post_send(). We don't have to worry about | |
373 | * receive interrupts since this is a connected protocol and all packets | |
374 | * will pass through here. | |
375 | */ | |
376 | static void ruc_loopback(struct hfi1_qp *sqp) | |
377 | { | |
378 | struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); | |
379 | struct hfi1_qp *qp; | |
380 | struct hfi1_swqe *wqe; | |
381 | struct hfi1_sge *sge; | |
382 | unsigned long flags; | |
383 | struct ib_wc wc; | |
384 | u64 sdata; | |
385 | atomic64_t *maddr; | |
386 | enum ib_wc_status send_status; | |
387 | int release; | |
388 | int ret; | |
389 | ||
390 | rcu_read_lock(); | |
391 | ||
392 | /* | |
393 | * Note that we check the responder QP state after | |
394 | * checking the requester's state. | |
395 | */ | |
396 | qp = hfi1_lookup_qpn(ibp, sqp->remote_qpn); | |
397 | ||
398 | spin_lock_irqsave(&sqp->s_lock, flags); | |
399 | ||
400 | /* Return if we are already busy processing a work request. */ | |
401 | if ((sqp->s_flags & (HFI1_S_BUSY | HFI1_S_ANY_WAIT)) || | |
402 | !(ib_hfi1_state_ops[sqp->state] & HFI1_PROCESS_OR_FLUSH_SEND)) | |
403 | goto unlock; | |
404 | ||
405 | sqp->s_flags |= HFI1_S_BUSY; | |
406 | ||
407 | again: | |
408 | if (sqp->s_last == sqp->s_head) | |
409 | goto clr_busy; | |
410 | wqe = get_swqe_ptr(sqp, sqp->s_last); | |
411 | ||
412 | /* Return if it is not OK to start a new work request. */ | |
413 | if (!(ib_hfi1_state_ops[sqp->state] & HFI1_PROCESS_NEXT_SEND_OK)) { | |
414 | if (!(ib_hfi1_state_ops[sqp->state] & HFI1_FLUSH_SEND)) | |
415 | goto clr_busy; | |
416 | /* We are in the error state, flush the work request. */ | |
417 | send_status = IB_WC_WR_FLUSH_ERR; | |
418 | goto flush_send; | |
419 | } | |
420 | ||
421 | /* | |
422 | * We can rely on the entry not changing without the s_lock | |
423 | * being held until we update s_last. | |
424 | * We increment s_cur to indicate s_last is in progress. | |
425 | */ | |
426 | if (sqp->s_last == sqp->s_cur) { | |
427 | if (++sqp->s_cur >= sqp->s_size) | |
428 | sqp->s_cur = 0; | |
429 | } | |
430 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
431 | ||
432 | if (!qp || !(ib_hfi1_state_ops[qp->state] & HFI1_PROCESS_RECV_OK) || | |
433 | qp->ibqp.qp_type != sqp->ibqp.qp_type) { | |
434 | ibp->n_pkt_drops++; | |
435 | /* | |
436 | * For RC, the requester would timeout and retry so | |
437 | * shortcut the timeouts and just signal too many retries. | |
438 | */ | |
439 | if (sqp->ibqp.qp_type == IB_QPT_RC) | |
440 | send_status = IB_WC_RETRY_EXC_ERR; | |
441 | else | |
442 | send_status = IB_WC_SUCCESS; | |
443 | goto serr; | |
444 | } | |
445 | ||
446 | memset(&wc, 0, sizeof(wc)); | |
447 | send_status = IB_WC_SUCCESS; | |
448 | ||
449 | release = 1; | |
450 | sqp->s_sge.sge = wqe->sg_list[0]; | |
451 | sqp->s_sge.sg_list = wqe->sg_list + 1; | |
452 | sqp->s_sge.num_sge = wqe->wr.num_sge; | |
453 | sqp->s_len = wqe->length; | |
454 | switch (wqe->wr.opcode) { | |
455 | case IB_WR_SEND_WITH_IMM: | |
456 | wc.wc_flags = IB_WC_WITH_IMM; | |
457 | wc.ex.imm_data = wqe->wr.ex.imm_data; | |
458 | /* FALLTHROUGH */ | |
459 | case IB_WR_SEND: | |
460 | ret = hfi1_get_rwqe(qp, 0); | |
461 | if (ret < 0) | |
462 | goto op_err; | |
463 | if (!ret) | |
464 | goto rnr_nak; | |
465 | break; | |
466 | ||
467 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
468 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
469 | goto inv_err; | |
470 | wc.wc_flags = IB_WC_WITH_IMM; | |
471 | wc.ex.imm_data = wqe->wr.ex.imm_data; | |
472 | ret = hfi1_get_rwqe(qp, 1); | |
473 | if (ret < 0) | |
474 | goto op_err; | |
475 | if (!ret) | |
476 | goto rnr_nak; | |
477 | /* FALLTHROUGH */ | |
478 | case IB_WR_RDMA_WRITE: | |
479 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
480 | goto inv_err; | |
481 | if (wqe->length == 0) | |
482 | break; | |
483 | if (unlikely(!hfi1_rkey_ok(qp, &qp->r_sge.sge, wqe->length, | |
484 | wqe->wr.wr.rdma.remote_addr, | |
485 | wqe->wr.wr.rdma.rkey, | |
486 | IB_ACCESS_REMOTE_WRITE))) | |
487 | goto acc_err; | |
488 | qp->r_sge.sg_list = NULL; | |
489 | qp->r_sge.num_sge = 1; | |
490 | qp->r_sge.total_len = wqe->length; | |
491 | break; | |
492 | ||
493 | case IB_WR_RDMA_READ: | |
494 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
495 | goto inv_err; | |
496 | if (unlikely(!hfi1_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, | |
497 | wqe->wr.wr.rdma.remote_addr, | |
498 | wqe->wr.wr.rdma.rkey, | |
499 | IB_ACCESS_REMOTE_READ))) | |
500 | goto acc_err; | |
501 | release = 0; | |
502 | sqp->s_sge.sg_list = NULL; | |
503 | sqp->s_sge.num_sge = 1; | |
504 | qp->r_sge.sge = wqe->sg_list[0]; | |
505 | qp->r_sge.sg_list = wqe->sg_list + 1; | |
506 | qp->r_sge.num_sge = wqe->wr.num_sge; | |
507 | qp->r_sge.total_len = wqe->length; | |
508 | break; | |
509 | ||
510 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
511 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
512 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) | |
513 | goto inv_err; | |
514 | if (unlikely(!hfi1_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), | |
515 | wqe->wr.wr.atomic.remote_addr, | |
516 | wqe->wr.wr.atomic.rkey, | |
517 | IB_ACCESS_REMOTE_ATOMIC))) | |
518 | goto acc_err; | |
519 | /* Perform atomic OP and save result. */ | |
520 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; | |
521 | sdata = wqe->wr.wr.atomic.compare_add; | |
522 | *(u64 *) sqp->s_sge.sge.vaddr = | |
523 | (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? | |
524 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
525 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
526 | sdata, wqe->wr.wr.atomic.swap); | |
527 | hfi1_put_mr(qp->r_sge.sge.mr); | |
528 | qp->r_sge.num_sge = 0; | |
529 | goto send_comp; | |
530 | ||
531 | default: | |
532 | send_status = IB_WC_LOC_QP_OP_ERR; | |
533 | goto serr; | |
534 | } | |
535 | ||
536 | sge = &sqp->s_sge.sge; | |
537 | while (sqp->s_len) { | |
538 | u32 len = sqp->s_len; | |
539 | ||
540 | if (len > sge->length) | |
541 | len = sge->length; | |
542 | if (len > sge->sge_length) | |
543 | len = sge->sge_length; | |
544 | WARN_ON_ONCE(len == 0); | |
545 | hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, release); | |
546 | sge->vaddr += len; | |
547 | sge->length -= len; | |
548 | sge->sge_length -= len; | |
549 | if (sge->sge_length == 0) { | |
550 | if (!release) | |
551 | hfi1_put_mr(sge->mr); | |
552 | if (--sqp->s_sge.num_sge) | |
553 | *sge = *sqp->s_sge.sg_list++; | |
554 | } else if (sge->length == 0 && sge->mr->lkey) { | |
555 | if (++sge->n >= HFI1_SEGSZ) { | |
556 | if (++sge->m >= sge->mr->mapsz) | |
557 | break; | |
558 | sge->n = 0; | |
559 | } | |
560 | sge->vaddr = | |
561 | sge->mr->map[sge->m]->segs[sge->n].vaddr; | |
562 | sge->length = | |
563 | sge->mr->map[sge->m]->segs[sge->n].length; | |
564 | } | |
565 | sqp->s_len -= len; | |
566 | } | |
567 | if (release) | |
568 | hfi1_put_ss(&qp->r_sge); | |
569 | ||
570 | if (!test_and_clear_bit(HFI1_R_WRID_VALID, &qp->r_aflags)) | |
571 | goto send_comp; | |
572 | ||
573 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) | |
574 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
575 | else | |
576 | wc.opcode = IB_WC_RECV; | |
577 | wc.wr_id = qp->r_wr_id; | |
578 | wc.status = IB_WC_SUCCESS; | |
579 | wc.byte_len = wqe->length; | |
580 | wc.qp = &qp->ibqp; | |
581 | wc.src_qp = qp->remote_qpn; | |
582 | wc.slid = qp->remote_ah_attr.dlid; | |
583 | wc.sl = qp->remote_ah_attr.sl; | |
584 | wc.port_num = 1; | |
585 | /* Signal completion event if the solicited bit is set. */ | |
586 | hfi1_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
587 | wqe->wr.send_flags & IB_SEND_SOLICITED); | |
588 | ||
589 | send_comp: | |
590 | spin_lock_irqsave(&sqp->s_lock, flags); | |
591 | ibp->n_loop_pkts++; | |
592 | flush_send: | |
593 | sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; | |
594 | hfi1_send_complete(sqp, wqe, send_status); | |
595 | goto again; | |
596 | ||
597 | rnr_nak: | |
598 | /* Handle RNR NAK */ | |
599 | if (qp->ibqp.qp_type == IB_QPT_UC) | |
600 | goto send_comp; | |
601 | ibp->n_rnr_naks++; | |
602 | /* | |
603 | * Note: we don't need the s_lock held since the BUSY flag | |
604 | * makes this single threaded. | |
605 | */ | |
606 | if (sqp->s_rnr_retry == 0) { | |
607 | send_status = IB_WC_RNR_RETRY_EXC_ERR; | |
608 | goto serr; | |
609 | } | |
610 | if (sqp->s_rnr_retry_cnt < 7) | |
611 | sqp->s_rnr_retry--; | |
612 | spin_lock_irqsave(&sqp->s_lock, flags); | |
613 | if (!(ib_hfi1_state_ops[sqp->state] & HFI1_PROCESS_RECV_OK)) | |
614 | goto clr_busy; | |
615 | sqp->s_flags |= HFI1_S_WAIT_RNR; | |
616 | sqp->s_timer.function = hfi1_rc_rnr_retry; | |
617 | sqp->s_timer.expires = jiffies + | |
618 | usecs_to_jiffies(ib_hfi1_rnr_table[qp->r_min_rnr_timer]); | |
619 | add_timer(&sqp->s_timer); | |
620 | goto clr_busy; | |
621 | ||
622 | op_err: | |
623 | send_status = IB_WC_REM_OP_ERR; | |
624 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
625 | goto err; | |
626 | ||
627 | inv_err: | |
628 | send_status = IB_WC_REM_INV_REQ_ERR; | |
629 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
630 | goto err; | |
631 | ||
632 | acc_err: | |
633 | send_status = IB_WC_REM_ACCESS_ERR; | |
634 | wc.status = IB_WC_LOC_PROT_ERR; | |
635 | err: | |
636 | /* responder goes to error state */ | |
637 | hfi1_rc_error(qp, wc.status); | |
638 | ||
639 | serr: | |
640 | spin_lock_irqsave(&sqp->s_lock, flags); | |
641 | hfi1_send_complete(sqp, wqe, send_status); | |
642 | if (sqp->ibqp.qp_type == IB_QPT_RC) { | |
643 | int lastwqe = hfi1_error_qp(sqp, IB_WC_WR_FLUSH_ERR); | |
644 | ||
645 | sqp->s_flags &= ~HFI1_S_BUSY; | |
646 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
647 | if (lastwqe) { | |
648 | struct ib_event ev; | |
649 | ||
650 | ev.device = sqp->ibqp.device; | |
651 | ev.element.qp = &sqp->ibqp; | |
652 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
653 | sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); | |
654 | } | |
655 | goto done; | |
656 | } | |
657 | clr_busy: | |
658 | sqp->s_flags &= ~HFI1_S_BUSY; | |
659 | unlock: | |
660 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
661 | done: | |
662 | rcu_read_unlock(); | |
663 | } | |
664 | ||
665 | /** | |
666 | * hfi1_make_grh - construct a GRH header | |
667 | * @ibp: a pointer to the IB port | |
668 | * @hdr: a pointer to the GRH header being constructed | |
669 | * @grh: the global route address to send to | |
670 | * @hwords: the number of 32 bit words of header being sent | |
671 | * @nwords: the number of 32 bit words of data being sent | |
672 | * | |
673 | * Return the size of the header in 32 bit words. | |
674 | */ | |
675 | u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr, | |
676 | struct ib_global_route *grh, u32 hwords, u32 nwords) | |
677 | { | |
678 | hdr->version_tclass_flow = | |
679 | cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | | |
680 | (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | | |
681 | (grh->flow_label << IB_GRH_FLOW_SHIFT)); | |
682 | hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); | |
683 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ | |
684 | hdr->next_hdr = IB_GRH_NEXT_HDR; | |
685 | hdr->hop_limit = grh->hop_limit; | |
686 | /* The SGID is 32-bit aligned. */ | |
687 | hdr->sgid.global.subnet_prefix = ibp->gid_prefix; | |
688 | hdr->sgid.global.interface_id = | |
689 | grh->sgid_index && grh->sgid_index < ARRAY_SIZE(ibp->guids) ? | |
690 | ibp->guids[grh->sgid_index - 1] : | |
691 | cpu_to_be64(ppd_from_ibp(ibp)->guid); | |
692 | hdr->dgid = grh->dgid; | |
693 | ||
694 | /* GRH header size in 32-bit words. */ | |
695 | return sizeof(struct ib_grh) / sizeof(u32); | |
696 | } | |
697 | ||
698 | /* | |
699 | * free_ahg - clear ahg from QP | |
700 | */ | |
701 | void clear_ahg(struct hfi1_qp *qp) | |
702 | { | |
703 | qp->s_hdr->ahgcount = 0; | |
704 | qp->s_flags &= ~(HFI1_S_AHG_VALID | HFI1_S_AHG_CLEAR); | |
705 | if (qp->s_sde) | |
706 | sdma_ahg_free(qp->s_sde, qp->s_ahgidx); | |
707 | qp->s_ahgidx = -1; | |
708 | qp->s_sde = NULL; | |
709 | } | |
710 | ||
711 | #define BTH2_OFFSET (offsetof(struct hfi1_pio_header, hdr.u.oth.bth[2]) / 4) | |
712 | ||
713 | /** | |
714 | * build_ahg - create ahg in s_hdr | |
715 | * @qp: a pointer to QP | |
716 | * @npsn: the next PSN for the request/response | |
717 | * | |
718 | * This routine handles the AHG by allocating an ahg entry and causing the | |
719 | * copy of the first middle. | |
720 | * | |
721 | * Subsequent middles use the copied entry, editing the | |
722 | * PSN with 1 or 2 edits. | |
723 | */ | |
724 | static inline void build_ahg(struct hfi1_qp *qp, u32 npsn) | |
725 | { | |
726 | if (unlikely(qp->s_flags & HFI1_S_AHG_CLEAR)) | |
727 | clear_ahg(qp); | |
728 | if (!(qp->s_flags & HFI1_S_AHG_VALID)) { | |
729 | /* first middle that needs copy */ | |
730 | if (qp->s_ahgidx < 0) { | |
731 | if (!qp->s_sde) | |
732 | qp->s_sde = qp_to_sdma_engine(qp, qp->s_sc); | |
733 | qp->s_ahgidx = sdma_ahg_alloc(qp->s_sde); | |
734 | } | |
735 | if (qp->s_ahgidx >= 0) { | |
736 | qp->s_ahgpsn = npsn; | |
737 | qp->s_hdr->tx_flags |= SDMA_TXREQ_F_AHG_COPY; | |
738 | /* save to protect a change in another thread */ | |
739 | qp->s_hdr->sde = qp->s_sde; | |
740 | qp->s_hdr->ahgidx = qp->s_ahgidx; | |
741 | qp->s_flags |= HFI1_S_AHG_VALID; | |
742 | } | |
743 | } else { | |
744 | /* subsequent middle after valid */ | |
745 | if (qp->s_ahgidx >= 0) { | |
746 | qp->s_hdr->tx_flags |= SDMA_TXREQ_F_USE_AHG; | |
747 | qp->s_hdr->ahgidx = qp->s_ahgidx; | |
748 | qp->s_hdr->ahgcount++; | |
749 | qp->s_hdr->ahgdesc[0] = | |
750 | sdma_build_ahg_descriptor( | |
751 | (__force u16)cpu_to_be16((u16)npsn), | |
752 | BTH2_OFFSET, | |
753 | 16, | |
754 | 16); | |
755 | if ((npsn & 0xffff0000) != | |
756 | (qp->s_ahgpsn & 0xffff0000)) { | |
757 | qp->s_hdr->ahgcount++; | |
758 | qp->s_hdr->ahgdesc[1] = | |
759 | sdma_build_ahg_descriptor( | |
760 | (__force u16)cpu_to_be16( | |
761 | (u16)(npsn >> 16)), | |
762 | BTH2_OFFSET, | |
763 | 0, | |
764 | 16); | |
765 | } | |
766 | } | |
767 | } | |
768 | } | |
769 | ||
770 | void hfi1_make_ruc_header(struct hfi1_qp *qp, struct hfi1_other_headers *ohdr, | |
771 | u32 bth0, u32 bth2, int middle) | |
772 | { | |
773 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
774 | u16 lrh0; | |
775 | u32 nwords; | |
776 | u32 extra_bytes; | |
777 | u8 sc5; | |
778 | u32 bth1; | |
779 | ||
780 | /* Construct the header. */ | |
781 | extra_bytes = -qp->s_cur_size & 3; | |
782 | nwords = (qp->s_cur_size + extra_bytes) >> 2; | |
783 | lrh0 = HFI1_LRH_BTH; | |
784 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
785 | qp->s_hdrwords += hfi1_make_grh(ibp, &qp->s_hdr->ibh.u.l.grh, | |
786 | &qp->remote_ah_attr.grh, | |
787 | qp->s_hdrwords, nwords); | |
788 | lrh0 = HFI1_LRH_GRH; | |
789 | middle = 0; | |
790 | } | |
791 | sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; | |
792 | lrh0 |= (sc5 & 0xf) << 12 | (qp->remote_ah_attr.sl & 0xf) << 4; | |
793 | qp->s_sc = sc5; | |
794 | /* | |
795 | * reset s_hdr/AHG fields | |
796 | * | |
797 | * This insures that the ahgentry/ahgcount | |
798 | * are at a non-AHG default to protect | |
799 | * build_verbs_tx_desc() from using | |
800 | * an include ahgidx. | |
801 | * | |
802 | * build_ahg() will modify as appropriate | |
803 | * to use the AHG feature. | |
804 | */ | |
805 | qp->s_hdr->tx_flags = 0; | |
806 | qp->s_hdr->ahgcount = 0; | |
807 | qp->s_hdr->ahgidx = 0; | |
808 | qp->s_hdr->sde = NULL; | |
809 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
810 | bth0 |= IB_BTH_MIG_REQ; | |
811 | else | |
812 | middle = 0; | |
813 | if (middle) | |
814 | build_ahg(qp, bth2); | |
815 | else | |
816 | qp->s_flags &= ~HFI1_S_AHG_VALID; | |
817 | qp->s_hdr->ibh.lrh[0] = cpu_to_be16(lrh0); | |
818 | qp->s_hdr->ibh.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
819 | qp->s_hdr->ibh.lrh[2] = | |
820 | cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); | |
821 | qp->s_hdr->ibh.lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | | |
822 | qp->remote_ah_attr.src_path_bits); | |
823 | bth0 |= hfi1_get_pkey(ibp, qp->s_pkey_index); | |
824 | bth0 |= extra_bytes << 20; | |
825 | ohdr->bth[0] = cpu_to_be32(bth0); | |
826 | bth1 = qp->remote_qpn; | |
827 | if (qp->s_flags & HFI1_S_ECN) { | |
828 | qp->s_flags &= ~HFI1_S_ECN; | |
829 | /* we recently received a FECN, so return a BECN */ | |
830 | bth1 |= (HFI1_BECN_MASK << HFI1_BECN_SHIFT); | |
831 | } | |
832 | ohdr->bth[1] = cpu_to_be32(bth1); | |
833 | ohdr->bth[2] = cpu_to_be32(bth2); | |
834 | } | |
835 | ||
836 | /** | |
837 | * hfi1_do_send - perform a send on a QP | |
838 | * @work: contains a pointer to the QP | |
839 | * | |
840 | * Process entries in the send work queue until credit or queue is | |
841 | * exhausted. Only allow one CPU to send a packet per QP (tasklet). | |
842 | * Otherwise, two threads could send packets out of order. | |
843 | */ | |
844 | void hfi1_do_send(struct work_struct *work) | |
845 | { | |
846 | struct iowait *wait = container_of(work, struct iowait, iowork); | |
847 | struct hfi1_qp *qp = container_of(wait, struct hfi1_qp, s_iowait); | |
848 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
849 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); | |
850 | int (*make_req)(struct hfi1_qp *qp); | |
851 | unsigned long flags; | |
852 | ||
853 | if ((qp->ibqp.qp_type == IB_QPT_RC || | |
854 | qp->ibqp.qp_type == IB_QPT_UC) && | |
855 | !loopback && | |
856 | (qp->remote_ah_attr.dlid & ~((1 << ppd->lmc) - 1)) == ppd->lid) { | |
857 | ruc_loopback(qp); | |
858 | return; | |
859 | } | |
860 | ||
861 | if (qp->ibqp.qp_type == IB_QPT_RC) | |
862 | make_req = hfi1_make_rc_req; | |
863 | else if (qp->ibqp.qp_type == IB_QPT_UC) | |
864 | make_req = hfi1_make_uc_req; | |
865 | else | |
866 | make_req = hfi1_make_ud_req; | |
867 | ||
868 | spin_lock_irqsave(&qp->s_lock, flags); | |
869 | ||
870 | /* Return if we are already busy processing a work request. */ | |
871 | if (!hfi1_send_ok(qp)) { | |
872 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
873 | return; | |
874 | } | |
875 | ||
876 | qp->s_flags |= HFI1_S_BUSY; | |
877 | ||
878 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
879 | ||
880 | do { | |
881 | /* Check for a constructed packet to be sent. */ | |
882 | if (qp->s_hdrwords != 0) { | |
883 | /* | |
884 | * If the packet cannot be sent now, return and | |
885 | * the send tasklet will be woken up later. | |
886 | */ | |
887 | if (hfi1_verbs_send(qp, qp->s_hdr, qp->s_hdrwords, | |
888 | qp->s_cur_sge, qp->s_cur_size)) | |
889 | break; | |
890 | /* Record that s_hdr is empty. */ | |
891 | qp->s_hdrwords = 0; | |
892 | } | |
893 | } while (make_req(qp)); | |
894 | } | |
895 | ||
896 | /* | |
897 | * This should be called with s_lock held. | |
898 | */ | |
899 | void hfi1_send_complete(struct hfi1_qp *qp, struct hfi1_swqe *wqe, | |
900 | enum ib_wc_status status) | |
901 | { | |
902 | u32 old_last, last; | |
903 | unsigned i; | |
904 | ||
905 | if (!(ib_hfi1_state_ops[qp->state] & HFI1_PROCESS_OR_FLUSH_SEND)) | |
906 | return; | |
907 | ||
908 | for (i = 0; i < wqe->wr.num_sge; i++) { | |
909 | struct hfi1_sge *sge = &wqe->sg_list[i]; | |
910 | ||
911 | hfi1_put_mr(sge->mr); | |
912 | } | |
913 | if (qp->ibqp.qp_type == IB_QPT_UD || | |
914 | qp->ibqp.qp_type == IB_QPT_SMI || | |
915 | qp->ibqp.qp_type == IB_QPT_GSI) | |
916 | atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount); | |
917 | ||
918 | /* See ch. 11.2.4.1 and 10.7.3.1 */ | |
919 | if (!(qp->s_flags & HFI1_S_SIGNAL_REQ_WR) || | |
920 | (wqe->wr.send_flags & IB_SEND_SIGNALED) || | |
921 | status != IB_WC_SUCCESS) { | |
922 | struct ib_wc wc; | |
923 | ||
924 | memset(&wc, 0, sizeof(wc)); | |
925 | wc.wr_id = wqe->wr.wr_id; | |
926 | wc.status = status; | |
927 | wc.opcode = ib_hfi1_wc_opcode[wqe->wr.opcode]; | |
928 | wc.qp = &qp->ibqp; | |
929 | if (status == IB_WC_SUCCESS) | |
930 | wc.byte_len = wqe->length; | |
931 | hfi1_cq_enter(to_icq(qp->ibqp.send_cq), &wc, | |
932 | status != IB_WC_SUCCESS); | |
933 | } | |
934 | ||
935 | last = qp->s_last; | |
936 | old_last = last; | |
937 | if (++last >= qp->s_size) | |
938 | last = 0; | |
939 | qp->s_last = last; | |
940 | if (qp->s_acked == old_last) | |
941 | qp->s_acked = last; | |
942 | if (qp->s_cur == old_last) | |
943 | qp->s_cur = last; | |
944 | if (qp->s_tail == old_last) | |
945 | qp->s_tail = last; | |
946 | if (qp->state == IB_QPS_SQD && last == qp->s_cur) | |
947 | qp->s_draining = 0; | |
948 | } |