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Commit | Line | Data |
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e28c00ad | 1 | /* |
53dc1ca1 | 2 | * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved. |
e28c00ad BS |
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 | ||
4ee97180 RC |
34 | #include <linux/spinlock.h> |
35 | ||
e28c00ad | 36 | #include "ipath_verbs.h" |
373d9915 | 37 | #include "ipath_kernel.h" |
e28c00ad BS |
38 | |
39 | /* | |
40 | * Convert the AETH RNR timeout code into the number of milliseconds. | |
41 | */ | |
42 | const u32 ib_ipath_rnr_table[32] = { | |
43 | 656, /* 0 */ | |
44 | 1, /* 1 */ | |
45 | 1, /* 2 */ | |
46 | 1, /* 3 */ | |
47 | 1, /* 4 */ | |
48 | 1, /* 5 */ | |
49 | 1, /* 6 */ | |
50 | 1, /* 7 */ | |
51 | 1, /* 8 */ | |
52 | 1, /* 9 */ | |
53 | 1, /* A */ | |
54 | 1, /* B */ | |
55 | 1, /* C */ | |
56 | 1, /* D */ | |
57 | 2, /* E */ | |
58 | 2, /* F */ | |
59 | 3, /* 10 */ | |
60 | 4, /* 11 */ | |
61 | 6, /* 12 */ | |
62 | 8, /* 13 */ | |
63 | 11, /* 14 */ | |
64 | 16, /* 15 */ | |
65 | 21, /* 16 */ | |
66 | 31, /* 17 */ | |
67 | 41, /* 18 */ | |
68 | 62, /* 19 */ | |
69 | 82, /* 1A */ | |
70 | 123, /* 1B */ | |
71 | 164, /* 1C */ | |
72 | 246, /* 1D */ | |
73 | 328, /* 1E */ | |
74 | 492 /* 1F */ | |
75 | }; | |
76 | ||
77 | /** | |
78 | * ipath_insert_rnr_queue - put QP on the RNR timeout list for the device | |
79 | * @qp: the QP | |
80 | * | |
e509be89 | 81 | * Called with the QP s_lock held and interrupts disabled. |
e28c00ad BS |
82 | * XXX Use a simple list for now. We might need a priority |
83 | * queue if we have lots of QPs waiting for RNR timeouts | |
84 | * but that should be rare. | |
85 | */ | |
86 | void ipath_insert_rnr_queue(struct ipath_qp *qp) | |
87 | { | |
88 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
e28c00ad | 89 | |
e509be89 RC |
90 | /* We already did a spin_lock_irqsave(), so just use spin_lock */ |
91 | spin_lock(&dev->pending_lock); | |
e28c00ad BS |
92 | if (list_empty(&dev->rnrwait)) |
93 | list_add(&qp->timerwait, &dev->rnrwait); | |
94 | else { | |
95 | struct list_head *l = &dev->rnrwait; | |
96 | struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp, | |
97 | timerwait); | |
98 | ||
99 | while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) { | |
100 | qp->s_rnr_timeout -= nqp->s_rnr_timeout; | |
101 | l = l->next; | |
cc65edcf RC |
102 | if (l->next == &dev->rnrwait) { |
103 | nqp = NULL; | |
e28c00ad | 104 | break; |
cc65edcf | 105 | } |
e28c00ad BS |
106 | nqp = list_entry(l->next, struct ipath_qp, |
107 | timerwait); | |
108 | } | |
cc65edcf RC |
109 | if (nqp) |
110 | nqp->s_rnr_timeout -= qp->s_rnr_timeout; | |
e28c00ad BS |
111 | list_add(&qp->timerwait, l); |
112 | } | |
e509be89 | 113 | spin_unlock(&dev->pending_lock); |
e28c00ad BS |
114 | } |
115 | ||
4ee97180 RC |
116 | /** |
117 | * ipath_init_sge - Validate a RWQE and fill in the SGE state | |
118 | * @qp: the QP | |
119 | * | |
120 | * Return 1 if OK. | |
121 | */ | |
122 | int ipath_init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe, | |
123 | u32 *lengthp, struct ipath_sge_state *ss) | |
373d9915 | 124 | { |
373d9915 RC |
125 | int i, j, ret; |
126 | struct ib_wc wc; | |
127 | ||
4ee97180 | 128 | *lengthp = 0; |
373d9915 RC |
129 | for (i = j = 0; i < wqe->num_sge; i++) { |
130 | if (wqe->sg_list[i].length == 0) | |
131 | continue; | |
132 | /* Check LKEY */ | |
4ee97180 RC |
133 | if (!ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge, |
134 | &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) | |
373d9915 | 135 | goto bad_lkey; |
4ee97180 | 136 | *lengthp += wqe->sg_list[i].length; |
373d9915 RC |
137 | j++; |
138 | } | |
4ee97180 | 139 | ss->num_sge = j; |
373d9915 RC |
140 | ret = 1; |
141 | goto bail; | |
142 | ||
143 | bad_lkey: | |
53dc1ca1 | 144 | memset(&wc, 0, sizeof(wc)); |
373d9915 RC |
145 | wc.wr_id = wqe->wr_id; |
146 | wc.status = IB_WC_LOC_PROT_ERR; | |
147 | wc.opcode = IB_WC_RECV; | |
062dbb69 | 148 | wc.qp = &qp->ibqp; |
373d9915 RC |
149 | /* Signal solicited completion event. */ |
150 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); | |
151 | ret = 0; | |
152 | bail: | |
153 | return ret; | |
154 | } | |
155 | ||
e28c00ad BS |
156 | /** |
157 | * ipath_get_rwqe - copy the next RWQE into the QP's RWQE | |
158 | * @qp: the QP | |
a8b56f29 | 159 | * @wr_id_only: update qp->r_wr_id only, not qp->r_sge |
e28c00ad BS |
160 | * |
161 | * Return 0 if no RWQE is available, otherwise return 1. | |
162 | * | |
12eef41f | 163 | * Can be called from interrupt level. |
e28c00ad BS |
164 | */ |
165 | int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only) | |
166 | { | |
12eef41f | 167 | unsigned long flags; |
e28c00ad | 168 | struct ipath_rq *rq; |
373d9915 | 169 | struct ipath_rwq *wq; |
e28c00ad BS |
170 | struct ipath_srq *srq; |
171 | struct ipath_rwqe *wqe; | |
373d9915 RC |
172 | void (*handler)(struct ib_event *, void *); |
173 | u32 tail; | |
174 | int ret; | |
e28c00ad | 175 | |
373d9915 RC |
176 | if (qp->ibqp.srq) { |
177 | srq = to_isrq(qp->ibqp.srq); | |
178 | handler = srq->ibsrq.event_handler; | |
179 | rq = &srq->rq; | |
180 | } else { | |
181 | srq = NULL; | |
182 | handler = NULL; | |
e28c00ad | 183 | rq = &qp->r_rq; |
e28c00ad BS |
184 | } |
185 | ||
12eef41f | 186 | spin_lock_irqsave(&rq->lock, flags); |
e509be89 RC |
187 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) { |
188 | ret = 0; | |
189 | goto unlock; | |
190 | } | |
191 | ||
373d9915 RC |
192 | wq = rq->wq; |
193 | tail = wq->tail; | |
194 | /* Validate tail before using it since it is user writable. */ | |
195 | if (tail >= rq->size) | |
196 | tail = 0; | |
197 | do { | |
198 | if (unlikely(tail == wq->head)) { | |
373d9915 | 199 | ret = 0; |
e509be89 | 200 | goto unlock; |
373d9915 | 201 | } |
4fc570bc RC |
202 | /* Make sure entry is read after head index is read. */ |
203 | smp_rmb(); | |
373d9915 RC |
204 | wqe = get_rwqe_ptr(rq, tail); |
205 | if (++tail >= rq->size) | |
206 | tail = 0; | |
a8b56f29 RC |
207 | if (wr_id_only) |
208 | break; | |
209 | qp->r_sge.sg_list = qp->r_sg_list; | |
210 | } while (!ipath_init_sge(qp, wqe, &qp->r_len, &qp->r_sge)); | |
e28c00ad | 211 | qp->r_wr_id = wqe->wr_id; |
373d9915 RC |
212 | wq->tail = tail; |
213 | ||
214 | ret = 1; | |
e509be89 | 215 | set_bit(IPATH_R_WRID_VALID, &qp->r_aflags); |
373d9915 | 216 | if (handler) { |
e28c00ad BS |
217 | u32 n; |
218 | ||
373d9915 RC |
219 | /* |
220 | * validate head pointer value and compute | |
221 | * the number of remaining WQEs. | |
222 | */ | |
223 | n = wq->head; | |
224 | if (n >= rq->size) | |
225 | n = 0; | |
226 | if (n < tail) | |
227 | n += rq->size - tail; | |
e28c00ad | 228 | else |
373d9915 | 229 | n -= tail; |
e28c00ad | 230 | if (n < srq->limit) { |
373d9915 RC |
231 | struct ib_event ev; |
232 | ||
e28c00ad | 233 | srq->limit = 0; |
12eef41f | 234 | spin_unlock_irqrestore(&rq->lock, flags); |
e28c00ad BS |
235 | ev.device = qp->ibqp.device; |
236 | ev.element.srq = qp->ibqp.srq; | |
237 | ev.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
373d9915 | 238 | handler(&ev, srq->ibsrq.srq_context); |
12eef41f BS |
239 | goto bail; |
240 | } | |
241 | } | |
e509be89 | 242 | unlock: |
12eef41f | 243 | spin_unlock_irqrestore(&rq->lock, flags); |
e28c00ad BS |
244 | bail: |
245 | return ret; | |
246 | } | |
247 | ||
248 | /** | |
249 | * ipath_ruc_loopback - handle UC and RC lookback requests | |
4ee97180 | 250 | * @sqp: the sending QP |
e28c00ad | 251 | * |
4ee97180 | 252 | * This is called from ipath_do_send() to |
e28c00ad BS |
253 | * forward a WQE addressed to the same HCA. |
254 | * Note that although we are single threaded due to the tasklet, we still | |
255 | * have to protect against post_send(). We don't have to worry about | |
256 | * receive interrupts since this is a connected protocol and all packets | |
257 | * will pass through here. | |
258 | */ | |
ddd4bb22 | 259 | static void ipath_ruc_loopback(struct ipath_qp *sqp) |
e28c00ad BS |
260 | { |
261 | struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); | |
262 | struct ipath_qp *qp; | |
263 | struct ipath_swqe *wqe; | |
264 | struct ipath_sge *sge; | |
265 | unsigned long flags; | |
ddd4bb22 | 266 | struct ib_wc wc; |
e28c00ad | 267 | u64 sdata; |
3859e39d | 268 | atomic64_t *maddr; |
53dc1ca1 | 269 | enum ib_wc_status send_status; |
e28c00ad | 270 | |
e509be89 RC |
271 | /* |
272 | * Note that we check the responder QP state after | |
273 | * checking the requester's state. | |
274 | */ | |
e28c00ad | 275 | qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn); |
e28c00ad | 276 | |
e28c00ad BS |
277 | spin_lock_irqsave(&sqp->s_lock, flags); |
278 | ||
e509be89 RC |
279 | /* Return if we are already busy processing a work request. */ |
280 | if ((sqp->s_flags & (IPATH_S_BUSY | IPATH_S_ANY_WAIT)) || | |
281 | !(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_OR_FLUSH_SEND)) | |
282 | goto unlock; | |
e28c00ad | 283 | |
e509be89 RC |
284 | sqp->s_flags |= IPATH_S_BUSY; |
285 | ||
286 | again: | |
287 | if (sqp->s_last == sqp->s_head) | |
288 | goto clr_busy; | |
289 | wqe = get_swqe_ptr(sqp, sqp->s_last); | |
290 | ||
291 | /* Return if it is not OK to start a new work reqeust. */ | |
292 | if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_NEXT_SEND_OK)) { | |
293 | if (!(ib_ipath_state_ops[sqp->state] & IPATH_FLUSH_SEND)) | |
294 | goto clr_busy; | |
295 | /* We are in the error state, flush the work request. */ | |
296 | send_status = IB_WC_WR_FLUSH_ERR; | |
297 | goto flush_send; | |
e28c00ad BS |
298 | } |
299 | ||
300 | /* | |
301 | * We can rely on the entry not changing without the s_lock | |
302 | * being held until we update s_last. | |
e509be89 | 303 | * We increment s_cur to indicate s_last is in progress. |
e28c00ad | 304 | */ |
e509be89 RC |
305 | if (sqp->s_last == sqp->s_cur) { |
306 | if (++sqp->s_cur >= sqp->s_size) | |
307 | sqp->s_cur = 0; | |
308 | } | |
e28c00ad BS |
309 | spin_unlock_irqrestore(&sqp->s_lock, flags); |
310 | ||
e509be89 RC |
311 | if (!qp || !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) { |
312 | dev->n_pkt_drops++; | |
313 | /* | |
314 | * For RC, the requester would timeout and retry so | |
315 | * shortcut the timeouts and just signal too many retries. | |
316 | */ | |
317 | if (sqp->ibqp.qp_type == IB_QPT_RC) | |
318 | send_status = IB_WC_RETRY_EXC_ERR; | |
319 | else | |
320 | send_status = IB_WC_SUCCESS; | |
321 | goto serr; | |
322 | } | |
323 | ||
53dc1ca1 RC |
324 | memset(&wc, 0, sizeof wc); |
325 | send_status = IB_WC_SUCCESS; | |
e28c00ad BS |
326 | |
327 | sqp->s_sge.sge = wqe->sg_list[0]; | |
328 | sqp->s_sge.sg_list = wqe->sg_list + 1; | |
329 | sqp->s_sge.num_sge = wqe->wr.num_sge; | |
330 | sqp->s_len = wqe->length; | |
331 | switch (wqe->wr.opcode) { | |
332 | case IB_WR_SEND_WITH_IMM: | |
ddd4bb22 | 333 | wc.wc_flags = IB_WC_WITH_IMM; |
00f7ec36 | 334 | wc.ex.imm_data = wqe->wr.ex.imm_data; |
e28c00ad BS |
335 | /* FALLTHROUGH */ |
336 | case IB_WR_SEND: | |
53dc1ca1 RC |
337 | if (!ipath_get_rwqe(qp, 0)) |
338 | goto rnr_nak; | |
e28c00ad BS |
339 | break; |
340 | ||
341 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
53dc1ca1 RC |
342 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) |
343 | goto inv_err; | |
ddd4bb22 | 344 | wc.wc_flags = IB_WC_WITH_IMM; |
00f7ec36 | 345 | wc.ex.imm_data = wqe->wr.ex.imm_data; |
e28c00ad BS |
346 | if (!ipath_get_rwqe(qp, 1)) |
347 | goto rnr_nak; | |
e28c00ad BS |
348 | /* FALLTHROUGH */ |
349 | case IB_WR_RDMA_WRITE: | |
53dc1ca1 RC |
350 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) |
351 | goto inv_err; | |
e28c00ad BS |
352 | if (wqe->length == 0) |
353 | break; | |
6a553af2 | 354 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length, |
e622f2f4 CH |
355 | wqe->rdma_wr.remote_addr, |
356 | wqe->rdma_wr.rkey, | |
53dc1ca1 RC |
357 | IB_ACCESS_REMOTE_WRITE))) |
358 | goto acc_err; | |
e28c00ad BS |
359 | break; |
360 | ||
361 | case IB_WR_RDMA_READ: | |
53dc1ca1 RC |
362 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) |
363 | goto inv_err; | |
6a553af2 | 364 | if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length, |
e622f2f4 CH |
365 | wqe->rdma_wr.remote_addr, |
366 | wqe->rdma_wr.rkey, | |
e28c00ad BS |
367 | IB_ACCESS_REMOTE_READ))) |
368 | goto acc_err; | |
e28c00ad BS |
369 | qp->r_sge.sge = wqe->sg_list[0]; |
370 | qp->r_sge.sg_list = wqe->sg_list + 1; | |
371 | qp->r_sge.num_sge = wqe->wr.num_sge; | |
372 | break; | |
373 | ||
374 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
375 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
53dc1ca1 RC |
376 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) |
377 | goto inv_err; | |
6a553af2 | 378 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64), |
e622f2f4 CH |
379 | wqe->atomic_wr.remote_addr, |
380 | wqe->atomic_wr.rkey, | |
e28c00ad BS |
381 | IB_ACCESS_REMOTE_ATOMIC))) |
382 | goto acc_err; | |
383 | /* Perform atomic OP and save result. */ | |
3859e39d | 384 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
e622f2f4 | 385 | sdata = wqe->atomic_wr.compare_add; |
3859e39d RC |
386 | *(u64 *) sqp->s_sge.sge.vaddr = |
387 | (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? | |
388 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
389 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
e622f2f4 | 390 | sdata, wqe->atomic_wr.swap); |
e28c00ad BS |
391 | goto send_comp; |
392 | ||
393 | default: | |
53dc1ca1 RC |
394 | send_status = IB_WC_LOC_QP_OP_ERR; |
395 | goto serr; | |
e28c00ad BS |
396 | } |
397 | ||
398 | sge = &sqp->s_sge.sge; | |
399 | while (sqp->s_len) { | |
400 | u32 len = sqp->s_len; | |
401 | ||
402 | if (len > sge->length) | |
403 | len = sge->length; | |
30d149ab RC |
404 | if (len > sge->sge_length) |
405 | len = sge->sge_length; | |
e28c00ad BS |
406 | BUG_ON(len == 0); |
407 | ipath_copy_sge(&qp->r_sge, sge->vaddr, len); | |
408 | sge->vaddr += len; | |
409 | sge->length -= len; | |
410 | sge->sge_length -= len; | |
411 | if (sge->sge_length == 0) { | |
412 | if (--sqp->s_sge.num_sge) | |
413 | *sge = *sqp->s_sge.sg_list++; | |
414 | } else if (sge->length == 0 && sge->mr != NULL) { | |
415 | if (++sge->n >= IPATH_SEGSZ) { | |
416 | if (++sge->m >= sge->mr->mapsz) | |
417 | break; | |
418 | sge->n = 0; | |
419 | } | |
420 | sge->vaddr = | |
421 | sge->mr->map[sge->m]->segs[sge->n].vaddr; | |
422 | sge->length = | |
423 | sge->mr->map[sge->m]->segs[sge->n].length; | |
424 | } | |
425 | sqp->s_len -= len; | |
426 | } | |
427 | ||
e509be89 | 428 | if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags)) |
e28c00ad BS |
429 | goto send_comp; |
430 | ||
431 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) | |
ddd4bb22 | 432 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; |
e28c00ad | 433 | else |
ddd4bb22 BS |
434 | wc.opcode = IB_WC_RECV; |
435 | wc.wr_id = qp->r_wr_id; | |
436 | wc.status = IB_WC_SUCCESS; | |
ddd4bb22 | 437 | wc.byte_len = wqe->length; |
062dbb69 | 438 | wc.qp = &qp->ibqp; |
ddd4bb22 | 439 | wc.src_qp = qp->remote_qpn; |
ddd4bb22 BS |
440 | wc.slid = qp->remote_ah_attr.dlid; |
441 | wc.sl = qp->remote_ah_attr.sl; | |
4ee97180 | 442 | wc.port_num = 1; |
e28c00ad | 443 | /* Signal completion event if the solicited bit is set. */ |
ddd4bb22 | 444 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, |
e28c00ad BS |
445 | wqe->wr.send_flags & IB_SEND_SOLICITED); |
446 | ||
447 | send_comp: | |
e509be89 RC |
448 | spin_lock_irqsave(&sqp->s_lock, flags); |
449 | flush_send: | |
e28c00ad | 450 | sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; |
53dc1ca1 | 451 | ipath_send_complete(sqp, wqe, send_status); |
e28c00ad BS |
452 | goto again; |
453 | ||
53dc1ca1 RC |
454 | rnr_nak: |
455 | /* Handle RNR NAK */ | |
456 | if (qp->ibqp.qp_type == IB_QPT_UC) | |
457 | goto send_comp; | |
458 | /* | |
459 | * Note: we don't need the s_lock held since the BUSY flag | |
460 | * makes this single threaded. | |
461 | */ | |
462 | if (sqp->s_rnr_retry == 0) { | |
463 | send_status = IB_WC_RNR_RETRY_EXC_ERR; | |
464 | goto serr; | |
465 | } | |
466 | if (sqp->s_rnr_retry_cnt < 7) | |
467 | sqp->s_rnr_retry--; | |
468 | spin_lock_irqsave(&sqp->s_lock, flags); | |
469 | if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_RECV_OK)) | |
e509be89 RC |
470 | goto clr_busy; |
471 | sqp->s_flags |= IPATH_S_WAITING; | |
53dc1ca1 RC |
472 | dev->n_rnr_naks++; |
473 | sqp->s_rnr_timeout = ib_ipath_rnr_table[qp->r_min_rnr_timer]; | |
474 | ipath_insert_rnr_queue(sqp); | |
e509be89 | 475 | goto clr_busy; |
53dc1ca1 RC |
476 | |
477 | inv_err: | |
478 | send_status = IB_WC_REM_INV_REQ_ERR; | |
479 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
480 | goto err; | |
481 | ||
482 | acc_err: | |
483 | send_status = IB_WC_REM_ACCESS_ERR; | |
484 | wc.status = IB_WC_LOC_PROT_ERR; | |
485 | err: | |
486 | /* responder goes to error state */ | |
487 | ipath_rc_error(qp, wc.status); | |
488 | ||
489 | serr: | |
490 | spin_lock_irqsave(&sqp->s_lock, flags); | |
491 | ipath_send_complete(sqp, wqe, send_status); | |
492 | if (sqp->ibqp.qp_type == IB_QPT_RC) { | |
493 | int lastwqe = ipath_error_qp(sqp, IB_WC_WR_FLUSH_ERR); | |
494 | ||
495 | sqp->s_flags &= ~IPATH_S_BUSY; | |
496 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
497 | if (lastwqe) { | |
498 | struct ib_event ev; | |
499 | ||
500 | ev.device = sqp->ibqp.device; | |
501 | ev.element.qp = &sqp->ibqp; | |
502 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
503 | sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); | |
504 | } | |
505 | goto done; | |
506 | } | |
e509be89 RC |
507 | clr_busy: |
508 | sqp->s_flags &= ~IPATH_S_BUSY; | |
53dc1ca1 RC |
509 | unlock: |
510 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
e28c00ad | 511 | done: |
e509be89 | 512 | if (qp && atomic_dec_and_test(&qp->refcount)) |
e28c00ad BS |
513 | wake_up(&qp->wait); |
514 | } | |
515 | ||
e2ab41ca | 516 | static void want_buffer(struct ipath_devdata *dd, struct ipath_qp *qp) |
34b2aafe | 517 | { |
e2ab41ca | 518 | if (!(dd->ipath_flags & IPATH_HAS_SEND_DMA) || |
e509be89 | 519 | qp->ibqp.qp_type == IB_QPT_SMI) { |
124b4dcb DO |
520 | unsigned long flags; |
521 | ||
522 | spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags); | |
523 | dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL; | |
524 | ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, | |
525 | dd->ipath_sendctrl); | |
526 | ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch); | |
527 | spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags); | |
528 | } | |
34b2aafe BS |
529 | } |
530 | ||
e28c00ad BS |
531 | /** |
532 | * ipath_no_bufs_available - tell the layer driver we need buffers | |
533 | * @qp: the QP that caused the problem | |
534 | * @dev: the device we ran out of buffers on | |
535 | * | |
536 | * Called when we run out of PIO buffers. | |
e509be89 RC |
537 | * If we are now in the error state, return zero to flush the |
538 | * send work request. | |
e28c00ad | 539 | */ |
e509be89 | 540 | static int ipath_no_bufs_available(struct ipath_qp *qp, |
4ee97180 | 541 | struct ipath_ibdev *dev) |
e28c00ad BS |
542 | { |
543 | unsigned long flags; | |
e509be89 | 544 | int ret = 1; |
e28c00ad | 545 | |
e28c00ad | 546 | /* |
34b2aafe | 547 | * Note that as soon as want_buffer() is called and |
e28c00ad | 548 | * possibly before it returns, ipath_ib_piobufavail() |
e509be89 RC |
549 | * could be called. Therefore, put QP on the piowait list before |
550 | * enabling the PIO avail interrupt. | |
e28c00ad | 551 | */ |
e509be89 RC |
552 | spin_lock_irqsave(&qp->s_lock, flags); |
553 | if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) { | |
554 | dev->n_piowait++; | |
555 | qp->s_flags |= IPATH_S_WAITING; | |
556 | qp->s_flags &= ~IPATH_S_BUSY; | |
557 | spin_lock(&dev->pending_lock); | |
558 | if (list_empty(&qp->piowait)) | |
559 | list_add_tail(&qp->piowait, &dev->piowait); | |
560 | spin_unlock(&dev->pending_lock); | |
561 | } else | |
562 | ret = 0; | |
563 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
564 | if (ret) | |
565 | want_buffer(dev->dd, qp); | |
566 | return ret; | |
e28c00ad BS |
567 | } |
568 | ||
ddd4bb22 BS |
569 | /** |
570 | * ipath_make_grh - construct a GRH header | |
571 | * @dev: a pointer to the ipath device | |
572 | * @hdr: a pointer to the GRH header being constructed | |
573 | * @grh: the global route address to send to | |
574 | * @hwords: the number of 32 bit words of header being sent | |
575 | * @nwords: the number of 32 bit words of data being sent | |
576 | * | |
577 | * Return the size of the header in 32 bit words. | |
578 | */ | |
579 | u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, | |
580 | struct ib_global_route *grh, u32 hwords, u32 nwords) | |
581 | { | |
582 | hdr->version_tclass_flow = | |
583 | cpu_to_be32((6 << 28) | | |
584 | (grh->traffic_class << 20) | | |
585 | grh->flow_label); | |
586 | hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); | |
587 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ | |
588 | hdr->next_hdr = 0x1B; | |
589 | hdr->hop_limit = grh->hop_limit; | |
590 | /* The SGID is 32-bit aligned. */ | |
591 | hdr->sgid.global.subnet_prefix = dev->gid_prefix; | |
34b2aafe | 592 | hdr->sgid.global.interface_id = dev->dd->ipath_guid; |
ddd4bb22 BS |
593 | hdr->dgid = grh->dgid; |
594 | ||
595 | /* GRH header size in 32-bit words. */ | |
596 | return sizeof(struct ib_grh) / sizeof(u32); | |
597 | } | |
598 | ||
4ee97180 RC |
599 | void ipath_make_ruc_header(struct ipath_ibdev *dev, struct ipath_qp *qp, |
600 | struct ipath_other_headers *ohdr, | |
601 | u32 bth0, u32 bth2) | |
602 | { | |
603 | u16 lrh0; | |
604 | u32 nwords; | |
605 | u32 extra_bytes; | |
606 | ||
607 | /* Construct the header. */ | |
608 | extra_bytes = -qp->s_cur_size & 3; | |
609 | nwords = (qp->s_cur_size + extra_bytes) >> 2; | |
610 | lrh0 = IPATH_LRH_BTH; | |
611 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
612 | qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, | |
613 | &qp->remote_ah_attr.grh, | |
614 | qp->s_hdrwords, nwords); | |
615 | lrh0 = IPATH_LRH_GRH; | |
616 | } | |
617 | lrh0 |= qp->remote_ah_attr.sl << 4; | |
618 | qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); | |
619 | qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
620 | qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); | |
94035896 RC |
621 | qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid | |
622 | qp->remote_ah_attr.src_path_bits); | |
4ee97180 RC |
623 | bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index); |
624 | bth0 |= extra_bytes << 20; | |
625 | ohdr->bth[0] = cpu_to_be32(bth0 | (1 << 22)); | |
626 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
627 | ohdr->bth[2] = cpu_to_be32(bth2); | |
628 | } | |
629 | ||
ddd4bb22 | 630 | /** |
4ee97180 | 631 | * ipath_do_send - perform a send on a QP |
ddd4bb22 BS |
632 | * @data: contains a pointer to the QP |
633 | * | |
634 | * Process entries in the send work queue until credit or queue is | |
635 | * exhausted. Only allow one CPU to send a packet per QP (tasklet). | |
4ee97180 | 636 | * Otherwise, two threads could send packets out of order. |
ddd4bb22 | 637 | */ |
4ee97180 | 638 | void ipath_do_send(unsigned long data) |
ddd4bb22 BS |
639 | { |
640 | struct ipath_qp *qp = (struct ipath_qp *)data; | |
641 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
4ee97180 | 642 | int (*make_req)(struct ipath_qp *qp); |
e509be89 | 643 | unsigned long flags; |
ddd4bb22 | 644 | |
4ee97180 RC |
645 | if ((qp->ibqp.qp_type == IB_QPT_RC || |
646 | qp->ibqp.qp_type == IB_QPT_UC) && | |
647 | qp->remote_ah_attr.dlid == dev->dd->ipath_lid) { | |
ddd4bb22 | 648 | ipath_ruc_loopback(qp); |
e509be89 | 649 | goto bail; |
ddd4bb22 BS |
650 | } |
651 | ||
4ee97180 RC |
652 | if (qp->ibqp.qp_type == IB_QPT_RC) |
653 | make_req = ipath_make_rc_req; | |
654 | else if (qp->ibqp.qp_type == IB_QPT_UC) | |
655 | make_req = ipath_make_uc_req; | |
656 | else | |
657 | make_req = ipath_make_ud_req; | |
ddd4bb22 | 658 | |
e509be89 RC |
659 | spin_lock_irqsave(&qp->s_lock, flags); |
660 | ||
661 | /* Return if we are already busy processing a work request. */ | |
662 | if ((qp->s_flags & (IPATH_S_BUSY | IPATH_S_ANY_WAIT)) || | |
663 | !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_OR_FLUSH_SEND)) { | |
664 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
665 | goto bail; | |
666 | } | |
667 | ||
668 | qp->s_flags |= IPATH_S_BUSY; | |
669 | ||
670 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
671 | ||
ddd4bb22 BS |
672 | again: |
673 | /* Check for a constructed packet to be sent. */ | |
674 | if (qp->s_hdrwords != 0) { | |
675 | /* | |
676 | * If no PIO bufs are available, return. An interrupt will | |
677 | * call ipath_ib_piobufavail() when one is available. | |
678 | */ | |
4ee97180 RC |
679 | if (ipath_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords, |
680 | qp->s_cur_sge, qp->s_cur_size)) { | |
e509be89 RC |
681 | if (ipath_no_bufs_available(qp, dev)) |
682 | goto bail; | |
ddd4bb22 BS |
683 | } |
684 | dev->n_unicast_xmit++; | |
685 | /* Record that we sent the packet and s_hdr is empty. */ | |
686 | qp->s_hdrwords = 0; | |
687 | } | |
688 | ||
4ee97180 RC |
689 | if (make_req(qp)) |
690 | goto again; | |
e509be89 | 691 | |
4ee97180 RC |
692 | bail:; |
693 | } | |
ddd4bb22 | 694 | |
e509be89 RC |
695 | /* |
696 | * This should be called with s_lock held. | |
697 | */ | |
4ee97180 RC |
698 | void ipath_send_complete(struct ipath_qp *qp, struct ipath_swqe *wqe, |
699 | enum ib_wc_status status) | |
700 | { | |
e509be89 RC |
701 | u32 old_last, last; |
702 | ||
703 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_OR_FLUSH_SEND)) | |
704 | return; | |
ddd4bb22 | 705 | |
4ee97180 RC |
706 | /* See ch. 11.2.4.1 and 10.7.3.1 */ |
707 | if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || | |
708 | (wqe->wr.send_flags & IB_SEND_SIGNALED) || | |
709 | status != IB_WC_SUCCESS) { | |
710 | struct ib_wc wc; | |
ddd4bb22 | 711 | |
53dc1ca1 | 712 | memset(&wc, 0, sizeof wc); |
4ee97180 RC |
713 | wc.wr_id = wqe->wr.wr_id; |
714 | wc.status = status; | |
715 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
4ee97180 | 716 | wc.qp = &qp->ibqp; |
53dc1ca1 RC |
717 | if (status == IB_WC_SUCCESS) |
718 | wc.byte_len = wqe->length; | |
719 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, | |
720 | status != IB_WC_SUCCESS); | |
4ee97180 | 721 | } |
fffbfeaa | 722 | |
e509be89 | 723 | old_last = last = qp->s_last; |
fffbfeaa RC |
724 | if (++last >= qp->s_size) |
725 | last = 0; | |
726 | qp->s_last = last; | |
e509be89 RC |
727 | if (qp->s_cur == old_last) |
728 | qp->s_cur = last; | |
729 | if (qp->s_tail == old_last) | |
730 | qp->s_tail = last; | |
731 | if (qp->state == IB_QPS_SQD && last == qp->s_cur) | |
732 | qp->s_draining = 0; | |
ddd4bb22 | 733 | } |