Commit | Line | Data |
---|---|---|
e28c00ad | 1 | /* |
87427da5 | 2 | * Copyright (c) 2006, 2007 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 | * | |
81 | * XXX Use a simple list for now. We might need a priority | |
82 | * queue if we have lots of QPs waiting for RNR timeouts | |
83 | * but that should be rare. | |
84 | */ | |
85 | void ipath_insert_rnr_queue(struct ipath_qp *qp) | |
86 | { | |
87 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
88 | unsigned long flags; | |
89 | ||
90 | spin_lock_irqsave(&dev->pending_lock, flags); | |
91 | if (list_empty(&dev->rnrwait)) | |
92 | list_add(&qp->timerwait, &dev->rnrwait); | |
93 | else { | |
94 | struct list_head *l = &dev->rnrwait; | |
95 | struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp, | |
96 | timerwait); | |
97 | ||
98 | while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) { | |
99 | qp->s_rnr_timeout -= nqp->s_rnr_timeout; | |
100 | l = l->next; | |
101 | if (l->next == &dev->rnrwait) | |
102 | break; | |
103 | nqp = list_entry(l->next, struct ipath_qp, | |
104 | timerwait); | |
105 | } | |
106 | list_add(&qp->timerwait, l); | |
107 | } | |
108 | spin_unlock_irqrestore(&dev->pending_lock, flags); | |
109 | } | |
110 | ||
4ee97180 RC |
111 | /** |
112 | * ipath_init_sge - Validate a RWQE and fill in the SGE state | |
113 | * @qp: the QP | |
114 | * | |
115 | * Return 1 if OK. | |
116 | */ | |
117 | int ipath_init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe, | |
118 | u32 *lengthp, struct ipath_sge_state *ss) | |
373d9915 | 119 | { |
373d9915 RC |
120 | int i, j, ret; |
121 | struct ib_wc wc; | |
122 | ||
4ee97180 | 123 | *lengthp = 0; |
373d9915 RC |
124 | for (i = j = 0; i < wqe->num_sge; i++) { |
125 | if (wqe->sg_list[i].length == 0) | |
126 | continue; | |
127 | /* Check LKEY */ | |
4ee97180 RC |
128 | if (!ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge, |
129 | &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) | |
373d9915 | 130 | goto bad_lkey; |
4ee97180 | 131 | *lengthp += wqe->sg_list[i].length; |
373d9915 RC |
132 | j++; |
133 | } | |
4ee97180 | 134 | ss->num_sge = j; |
373d9915 RC |
135 | ret = 1; |
136 | goto bail; | |
137 | ||
138 | bad_lkey: | |
139 | wc.wr_id = wqe->wr_id; | |
140 | wc.status = IB_WC_LOC_PROT_ERR; | |
141 | wc.opcode = IB_WC_RECV; | |
142 | wc.vendor_err = 0; | |
143 | wc.byte_len = 0; | |
144 | wc.imm_data = 0; | |
062dbb69 | 145 | wc.qp = &qp->ibqp; |
373d9915 RC |
146 | wc.src_qp = 0; |
147 | wc.wc_flags = 0; | |
148 | wc.pkey_index = 0; | |
149 | wc.slid = 0; | |
150 | wc.sl = 0; | |
151 | wc.dlid_path_bits = 0; | |
152 | wc.port_num = 0; | |
153 | /* Signal solicited completion event. */ | |
154 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); | |
155 | ret = 0; | |
156 | bail: | |
157 | return ret; | |
158 | } | |
159 | ||
e28c00ad BS |
160 | /** |
161 | * ipath_get_rwqe - copy the next RWQE into the QP's RWQE | |
162 | * @qp: the QP | |
163 | * @wr_id_only: update wr_id only, not SGEs | |
164 | * | |
165 | * Return 0 if no RWQE is available, otherwise return 1. | |
166 | * | |
12eef41f | 167 | * Can be called from interrupt level. |
e28c00ad BS |
168 | */ |
169 | int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only) | |
170 | { | |
12eef41f | 171 | unsigned long flags; |
e28c00ad | 172 | struct ipath_rq *rq; |
373d9915 | 173 | struct ipath_rwq *wq; |
e28c00ad BS |
174 | struct ipath_srq *srq; |
175 | struct ipath_rwqe *wqe; | |
373d9915 RC |
176 | void (*handler)(struct ib_event *, void *); |
177 | u32 tail; | |
178 | int ret; | |
e28c00ad | 179 | |
4ee97180 RC |
180 | qp->r_sge.sg_list = qp->r_sg_list; |
181 | ||
373d9915 RC |
182 | if (qp->ibqp.srq) { |
183 | srq = to_isrq(qp->ibqp.srq); | |
184 | handler = srq->ibsrq.event_handler; | |
185 | rq = &srq->rq; | |
186 | } else { | |
187 | srq = NULL; | |
188 | handler = NULL; | |
e28c00ad | 189 | rq = &qp->r_rq; |
e28c00ad BS |
190 | } |
191 | ||
12eef41f | 192 | spin_lock_irqsave(&rq->lock, flags); |
373d9915 RC |
193 | wq = rq->wq; |
194 | tail = wq->tail; | |
195 | /* Validate tail before using it since it is user writable. */ | |
196 | if (tail >= rq->size) | |
197 | tail = 0; | |
198 | do { | |
199 | if (unlikely(tail == wq->head)) { | |
200 | spin_unlock_irqrestore(&rq->lock, flags); | |
201 | ret = 0; | |
202 | goto bail; | |
203 | } | |
4fc570bc RC |
204 | /* Make sure entry is read after head index is read. */ |
205 | smp_rmb(); | |
373d9915 RC |
206 | wqe = get_rwqe_ptr(rq, tail); |
207 | if (++tail >= rq->size) | |
208 | tail = 0; | |
4ee97180 RC |
209 | } while (!wr_id_only && !ipath_init_sge(qp, wqe, &qp->r_len, |
210 | &qp->r_sge)); | |
e28c00ad | 211 | qp->r_wr_id = wqe->wr_id; |
373d9915 RC |
212 | wq->tail = tail; |
213 | ||
214 | ret = 1; | |
9f9630d5 | 215 | qp->r_wrid_valid = 1; |
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 | } | |
12eef41f | 242 | spin_unlock_irqrestore(&rq->lock, flags); |
373d9915 | 243 | |
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; |
e28c00ad BS |
269 | |
270 | qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn); | |
271 | if (!qp) { | |
272 | dev->n_pkt_drops++; | |
273 | return; | |
274 | } | |
275 | ||
276 | again: | |
277 | spin_lock_irqsave(&sqp->s_lock, flags); | |
278 | ||
7b21d26d | 279 | if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK) || |
6d2fad04 | 280 | sqp->s_rnr_timeout) { |
e28c00ad BS |
281 | spin_unlock_irqrestore(&sqp->s_lock, flags); |
282 | goto done; | |
283 | } | |
284 | ||
285 | /* Get the next send request. */ | |
286 | if (sqp->s_last == sqp->s_head) { | |
287 | /* Send work queue is empty. */ | |
288 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
289 | goto done; | |
290 | } | |
291 | ||
292 | /* | |
293 | * We can rely on the entry not changing without the s_lock | |
294 | * being held until we update s_last. | |
295 | */ | |
296 | wqe = get_swqe_ptr(sqp, sqp->s_last); | |
297 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
298 | ||
ddd4bb22 BS |
299 | wc.wc_flags = 0; |
300 | wc.imm_data = 0; | |
e28c00ad BS |
301 | |
302 | sqp->s_sge.sge = wqe->sg_list[0]; | |
303 | sqp->s_sge.sg_list = wqe->sg_list + 1; | |
304 | sqp->s_sge.num_sge = wqe->wr.num_sge; | |
305 | sqp->s_len = wqe->length; | |
306 | switch (wqe->wr.opcode) { | |
307 | case IB_WR_SEND_WITH_IMM: | |
ddd4bb22 BS |
308 | wc.wc_flags = IB_WC_WITH_IMM; |
309 | wc.imm_data = wqe->wr.imm_data; | |
e28c00ad BS |
310 | /* FALLTHROUGH */ |
311 | case IB_WR_SEND: | |
e28c00ad BS |
312 | if (!ipath_get_rwqe(qp, 0)) { |
313 | rnr_nak: | |
e28c00ad BS |
314 | /* Handle RNR NAK */ |
315 | if (qp->ibqp.qp_type == IB_QPT_UC) | |
316 | goto send_comp; | |
317 | if (sqp->s_rnr_retry == 0) { | |
ddd4bb22 | 318 | wc.status = IB_WC_RNR_RETRY_EXC_ERR; |
e28c00ad BS |
319 | goto err; |
320 | } | |
321 | if (sqp->s_rnr_retry_cnt < 7) | |
322 | sqp->s_rnr_retry--; | |
323 | dev->n_rnr_naks++; | |
324 | sqp->s_rnr_timeout = | |
3859e39d | 325 | ib_ipath_rnr_table[qp->r_min_rnr_timer]; |
e28c00ad BS |
326 | ipath_insert_rnr_queue(sqp); |
327 | goto done; | |
328 | } | |
e28c00ad BS |
329 | break; |
330 | ||
331 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
b506e1dc RW |
332 | if (unlikely(!(qp->qp_access_flags & |
333 | IB_ACCESS_REMOTE_WRITE))) { | |
334 | wc.status = IB_WC_REM_INV_REQ_ERR; | |
335 | goto err; | |
336 | } | |
ddd4bb22 BS |
337 | wc.wc_flags = IB_WC_WITH_IMM; |
338 | wc.imm_data = wqe->wr.imm_data; | |
e28c00ad BS |
339 | if (!ipath_get_rwqe(qp, 1)) |
340 | goto rnr_nak; | |
e28c00ad BS |
341 | /* FALLTHROUGH */ |
342 | case IB_WR_RDMA_WRITE: | |
b506e1dc RW |
343 | if (unlikely(!(qp->qp_access_flags & |
344 | IB_ACCESS_REMOTE_WRITE))) { | |
345 | wc.status = IB_WC_REM_INV_REQ_ERR; | |
346 | goto err; | |
347 | } | |
e28c00ad BS |
348 | if (wqe->length == 0) |
349 | break; | |
6a553af2 | 350 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length, |
e28c00ad BS |
351 | wqe->wr.wr.rdma.remote_addr, |
352 | wqe->wr.wr.rdma.rkey, | |
353 | IB_ACCESS_REMOTE_WRITE))) { | |
354 | acc_err: | |
ddd4bb22 | 355 | wc.status = IB_WC_REM_ACCESS_ERR; |
e28c00ad | 356 | err: |
ddd4bb22 BS |
357 | wc.wr_id = wqe->wr.wr_id; |
358 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
359 | wc.vendor_err = 0; | |
360 | wc.byte_len = 0; | |
062dbb69 | 361 | wc.qp = &sqp->ibqp; |
ddd4bb22 BS |
362 | wc.src_qp = sqp->remote_qpn; |
363 | wc.pkey_index = 0; | |
364 | wc.slid = sqp->remote_ah_attr.dlid; | |
365 | wc.sl = sqp->remote_ah_attr.sl; | |
366 | wc.dlid_path_bits = 0; | |
367 | wc.port_num = 0; | |
3859e39d | 368 | spin_lock_irqsave(&sqp->s_lock, flags); |
ddd4bb22 | 369 | ipath_sqerror_qp(sqp, &wc); |
3859e39d | 370 | spin_unlock_irqrestore(&sqp->s_lock, flags); |
e28c00ad BS |
371 | goto done; |
372 | } | |
373 | break; | |
374 | ||
375 | case IB_WR_RDMA_READ: | |
3859e39d | 376 | if (unlikely(!(qp->qp_access_flags & |
b506e1dc RW |
377 | IB_ACCESS_REMOTE_READ))) { |
378 | wc.status = IB_WC_REM_INV_REQ_ERR; | |
379 | goto err; | |
380 | } | |
6a553af2 | 381 | if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length, |
e28c00ad BS |
382 | wqe->wr.wr.rdma.remote_addr, |
383 | wqe->wr.wr.rdma.rkey, | |
384 | IB_ACCESS_REMOTE_READ))) | |
385 | goto acc_err; | |
e28c00ad BS |
386 | qp->r_sge.sge = wqe->sg_list[0]; |
387 | qp->r_sge.sg_list = wqe->sg_list + 1; | |
388 | qp->r_sge.num_sge = wqe->wr.num_sge; | |
389 | break; | |
390 | ||
391 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
392 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
3859e39d | 393 | if (unlikely(!(qp->qp_access_flags & |
b506e1dc RW |
394 | IB_ACCESS_REMOTE_ATOMIC))) { |
395 | wc.status = IB_WC_REM_INV_REQ_ERR; | |
396 | goto err; | |
397 | } | |
6a553af2 | 398 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64), |
3859e39d RC |
399 | wqe->wr.wr.atomic.remote_addr, |
400 | wqe->wr.wr.atomic.rkey, | |
e28c00ad BS |
401 | IB_ACCESS_REMOTE_ATOMIC))) |
402 | goto acc_err; | |
403 | /* Perform atomic OP and save result. */ | |
3859e39d RC |
404 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
405 | sdata = wqe->wr.wr.atomic.compare_add; | |
406 | *(u64 *) sqp->s_sge.sge.vaddr = | |
407 | (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? | |
408 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
409 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
410 | sdata, wqe->wr.wr.atomic.swap); | |
e28c00ad BS |
411 | goto send_comp; |
412 | ||
413 | default: | |
414 | goto done; | |
415 | } | |
416 | ||
417 | sge = &sqp->s_sge.sge; | |
418 | while (sqp->s_len) { | |
419 | u32 len = sqp->s_len; | |
420 | ||
421 | if (len > sge->length) | |
422 | len = sge->length; | |
30d149ab RC |
423 | if (len > sge->sge_length) |
424 | len = sge->sge_length; | |
e28c00ad BS |
425 | BUG_ON(len == 0); |
426 | ipath_copy_sge(&qp->r_sge, sge->vaddr, len); | |
427 | sge->vaddr += len; | |
428 | sge->length -= len; | |
429 | sge->sge_length -= len; | |
430 | if (sge->sge_length == 0) { | |
431 | if (--sqp->s_sge.num_sge) | |
432 | *sge = *sqp->s_sge.sg_list++; | |
433 | } else if (sge->length == 0 && sge->mr != NULL) { | |
434 | if (++sge->n >= IPATH_SEGSZ) { | |
435 | if (++sge->m >= sge->mr->mapsz) | |
436 | break; | |
437 | sge->n = 0; | |
438 | } | |
439 | sge->vaddr = | |
440 | sge->mr->map[sge->m]->segs[sge->n].vaddr; | |
441 | sge->length = | |
442 | sge->mr->map[sge->m]->segs[sge->n].length; | |
443 | } | |
444 | sqp->s_len -= len; | |
445 | } | |
446 | ||
447 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE || | |
448 | wqe->wr.opcode == IB_WR_RDMA_READ) | |
449 | goto send_comp; | |
450 | ||
451 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) | |
ddd4bb22 | 452 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; |
e28c00ad | 453 | else |
ddd4bb22 BS |
454 | wc.opcode = IB_WC_RECV; |
455 | wc.wr_id = qp->r_wr_id; | |
456 | wc.status = IB_WC_SUCCESS; | |
457 | wc.vendor_err = 0; | |
458 | wc.byte_len = wqe->length; | |
062dbb69 | 459 | wc.qp = &qp->ibqp; |
ddd4bb22 | 460 | wc.src_qp = qp->remote_qpn; |
ddd4bb22 BS |
461 | wc.pkey_index = 0; |
462 | wc.slid = qp->remote_ah_attr.dlid; | |
463 | wc.sl = qp->remote_ah_attr.sl; | |
464 | wc.dlid_path_bits = 0; | |
4ee97180 | 465 | wc.port_num = 1; |
e28c00ad | 466 | /* Signal completion event if the solicited bit is set. */ |
ddd4bb22 | 467 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, |
e28c00ad BS |
468 | wqe->wr.send_flags & IB_SEND_SOLICITED); |
469 | ||
470 | send_comp: | |
471 | sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; | |
4ee97180 | 472 | ipath_send_complete(sqp, wqe, IB_WC_SUCCESS); |
e28c00ad BS |
473 | goto again; |
474 | ||
475 | done: | |
476 | if (atomic_dec_and_test(&qp->refcount)) | |
477 | wake_up(&qp->wait); | |
478 | } | |
479 | ||
4ee97180 | 480 | static void want_buffer(struct ipath_devdata *dd) |
34b2aafe BS |
481 | { |
482 | set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl); | |
483 | ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, | |
484 | dd->ipath_sendctrl); | |
34b2aafe BS |
485 | } |
486 | ||
e28c00ad BS |
487 | /** |
488 | * ipath_no_bufs_available - tell the layer driver we need buffers | |
489 | * @qp: the QP that caused the problem | |
490 | * @dev: the device we ran out of buffers on | |
491 | * | |
492 | * Called when we run out of PIO buffers. | |
493 | */ | |
4ee97180 RC |
494 | static void ipath_no_bufs_available(struct ipath_qp *qp, |
495 | struct ipath_ibdev *dev) | |
e28c00ad BS |
496 | { |
497 | unsigned long flags; | |
498 | ||
e28c00ad | 499 | /* |
34b2aafe | 500 | * Note that as soon as want_buffer() is called and |
e28c00ad BS |
501 | * possibly before it returns, ipath_ib_piobufavail() |
502 | * could be called. If we are still in the tasklet function, | |
503 | * tasklet_hi_schedule() will not call us until the next time | |
504 | * tasklet_hi_schedule() is called. | |
db5518cd RC |
505 | * We leave the busy flag set so that another post send doesn't |
506 | * try to put the same QP on the piowait list again. | |
e28c00ad | 507 | */ |
4ee97180 RC |
508 | spin_lock_irqsave(&dev->pending_lock, flags); |
509 | list_add_tail(&qp->piowait, &dev->piowait); | |
510 | spin_unlock_irqrestore(&dev->pending_lock, flags); | |
34b2aafe | 511 | want_buffer(dev->dd); |
e28c00ad BS |
512 | dev->n_piowait++; |
513 | } | |
514 | ||
ddd4bb22 BS |
515 | /** |
516 | * ipath_make_grh - construct a GRH header | |
517 | * @dev: a pointer to the ipath device | |
518 | * @hdr: a pointer to the GRH header being constructed | |
519 | * @grh: the global route address to send to | |
520 | * @hwords: the number of 32 bit words of header being sent | |
521 | * @nwords: the number of 32 bit words of data being sent | |
522 | * | |
523 | * Return the size of the header in 32 bit words. | |
524 | */ | |
525 | u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, | |
526 | struct ib_global_route *grh, u32 hwords, u32 nwords) | |
527 | { | |
528 | hdr->version_tclass_flow = | |
529 | cpu_to_be32((6 << 28) | | |
530 | (grh->traffic_class << 20) | | |
531 | grh->flow_label); | |
532 | hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); | |
533 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ | |
534 | hdr->next_hdr = 0x1B; | |
535 | hdr->hop_limit = grh->hop_limit; | |
536 | /* The SGID is 32-bit aligned. */ | |
537 | hdr->sgid.global.subnet_prefix = dev->gid_prefix; | |
34b2aafe | 538 | hdr->sgid.global.interface_id = dev->dd->ipath_guid; |
ddd4bb22 BS |
539 | hdr->dgid = grh->dgid; |
540 | ||
541 | /* GRH header size in 32-bit words. */ | |
542 | return sizeof(struct ib_grh) / sizeof(u32); | |
543 | } | |
544 | ||
4ee97180 RC |
545 | void ipath_make_ruc_header(struct ipath_ibdev *dev, struct ipath_qp *qp, |
546 | struct ipath_other_headers *ohdr, | |
547 | u32 bth0, u32 bth2) | |
548 | { | |
549 | u16 lrh0; | |
550 | u32 nwords; | |
551 | u32 extra_bytes; | |
552 | ||
553 | /* Construct the header. */ | |
554 | extra_bytes = -qp->s_cur_size & 3; | |
555 | nwords = (qp->s_cur_size + extra_bytes) >> 2; | |
556 | lrh0 = IPATH_LRH_BTH; | |
557 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
558 | qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, | |
559 | &qp->remote_ah_attr.grh, | |
560 | qp->s_hdrwords, nwords); | |
561 | lrh0 = IPATH_LRH_GRH; | |
562 | } | |
563 | lrh0 |= qp->remote_ah_attr.sl << 4; | |
564 | qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); | |
565 | qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
566 | qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); | |
567 | qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid); | |
568 | bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index); | |
569 | bth0 |= extra_bytes << 20; | |
570 | ohdr->bth[0] = cpu_to_be32(bth0 | (1 << 22)); | |
571 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
572 | ohdr->bth[2] = cpu_to_be32(bth2); | |
573 | } | |
574 | ||
ddd4bb22 | 575 | /** |
4ee97180 | 576 | * ipath_do_send - perform a send on a QP |
ddd4bb22 BS |
577 | * @data: contains a pointer to the QP |
578 | * | |
579 | * Process entries in the send work queue until credit or queue is | |
580 | * exhausted. Only allow one CPU to send a packet per QP (tasklet). | |
4ee97180 | 581 | * Otherwise, two threads could send packets out of order. |
ddd4bb22 | 582 | */ |
4ee97180 | 583 | void ipath_do_send(unsigned long data) |
ddd4bb22 BS |
584 | { |
585 | struct ipath_qp *qp = (struct ipath_qp *)data; | |
586 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
4ee97180 | 587 | int (*make_req)(struct ipath_qp *qp); |
ddd4bb22 | 588 | |
3859e39d | 589 | if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy)) |
ddd4bb22 BS |
590 | goto bail; |
591 | ||
4ee97180 RC |
592 | if ((qp->ibqp.qp_type == IB_QPT_RC || |
593 | qp->ibqp.qp_type == IB_QPT_UC) && | |
594 | qp->remote_ah_attr.dlid == dev->dd->ipath_lid) { | |
ddd4bb22 BS |
595 | ipath_ruc_loopback(qp); |
596 | goto clear; | |
597 | } | |
598 | ||
4ee97180 RC |
599 | if (qp->ibqp.qp_type == IB_QPT_RC) |
600 | make_req = ipath_make_rc_req; | |
601 | else if (qp->ibqp.qp_type == IB_QPT_UC) | |
602 | make_req = ipath_make_uc_req; | |
603 | else | |
604 | make_req = ipath_make_ud_req; | |
ddd4bb22 BS |
605 | |
606 | again: | |
607 | /* Check for a constructed packet to be sent. */ | |
608 | if (qp->s_hdrwords != 0) { | |
609 | /* | |
610 | * If no PIO bufs are available, return. An interrupt will | |
611 | * call ipath_ib_piobufavail() when one is available. | |
612 | */ | |
4ee97180 RC |
613 | if (ipath_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords, |
614 | qp->s_cur_sge, qp->s_cur_size)) { | |
ddd4bb22 BS |
615 | ipath_no_bufs_available(qp, dev); |
616 | goto bail; | |
617 | } | |
618 | dev->n_unicast_xmit++; | |
619 | /* Record that we sent the packet and s_hdr is empty. */ | |
620 | qp->s_hdrwords = 0; | |
621 | } | |
622 | ||
4ee97180 RC |
623 | if (make_req(qp)) |
624 | goto again; | |
625 | clear: | |
626 | clear_bit(IPATH_S_BUSY, &qp->s_busy); | |
627 | bail:; | |
628 | } | |
ddd4bb22 | 629 | |
4ee97180 RC |
630 | void ipath_send_complete(struct ipath_qp *qp, struct ipath_swqe *wqe, |
631 | enum ib_wc_status status) | |
632 | { | |
fffbfeaa RC |
633 | unsigned long flags; |
634 | u32 last; | |
ddd4bb22 | 635 | |
4ee97180 RC |
636 | /* See ch. 11.2.4.1 and 10.7.3.1 */ |
637 | if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || | |
638 | (wqe->wr.send_flags & IB_SEND_SIGNALED) || | |
639 | status != IB_WC_SUCCESS) { | |
640 | struct ib_wc wc; | |
ddd4bb22 | 641 | |
4ee97180 RC |
642 | wc.wr_id = wqe->wr.wr_id; |
643 | wc.status = status; | |
644 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
645 | wc.vendor_err = 0; | |
646 | wc.byte_len = wqe->length; | |
647 | wc.imm_data = 0; | |
648 | wc.qp = &qp->ibqp; | |
649 | wc.src_qp = 0; | |
650 | wc.wc_flags = 0; | |
651 | wc.pkey_index = 0; | |
652 | wc.slid = 0; | |
653 | wc.sl = 0; | |
654 | wc.dlid_path_bits = 0; | |
655 | wc.port_num = 0; | |
656 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
657 | } | |
fffbfeaa RC |
658 | |
659 | spin_lock_irqsave(&qp->s_lock, flags); | |
660 | last = qp->s_last; | |
661 | if (++last >= qp->s_size) | |
662 | last = 0; | |
663 | qp->s_last = last; | |
664 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
ddd4bb22 | 665 | } |