Commit | Line | Data |
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e28c00ad | 1 | /* |
759d5768 | 2 | * Copyright (c) 2006 QLogic, Inc. 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 | ||
34 | #include "ipath_verbs.h" | |
373d9915 | 35 | #include "ipath_kernel.h" |
e28c00ad BS |
36 | |
37 | /* | |
38 | * Convert the AETH RNR timeout code into the number of milliseconds. | |
39 | */ | |
40 | const u32 ib_ipath_rnr_table[32] = { | |
41 | 656, /* 0 */ | |
42 | 1, /* 1 */ | |
43 | 1, /* 2 */ | |
44 | 1, /* 3 */ | |
45 | 1, /* 4 */ | |
46 | 1, /* 5 */ | |
47 | 1, /* 6 */ | |
48 | 1, /* 7 */ | |
49 | 1, /* 8 */ | |
50 | 1, /* 9 */ | |
51 | 1, /* A */ | |
52 | 1, /* B */ | |
53 | 1, /* C */ | |
54 | 1, /* D */ | |
55 | 2, /* E */ | |
56 | 2, /* F */ | |
57 | 3, /* 10 */ | |
58 | 4, /* 11 */ | |
59 | 6, /* 12 */ | |
60 | 8, /* 13 */ | |
61 | 11, /* 14 */ | |
62 | 16, /* 15 */ | |
63 | 21, /* 16 */ | |
64 | 31, /* 17 */ | |
65 | 41, /* 18 */ | |
66 | 62, /* 19 */ | |
67 | 82, /* 1A */ | |
68 | 123, /* 1B */ | |
69 | 164, /* 1C */ | |
70 | 246, /* 1D */ | |
71 | 328, /* 1E */ | |
72 | 492 /* 1F */ | |
73 | }; | |
74 | ||
75 | /** | |
76 | * ipath_insert_rnr_queue - put QP on the RNR timeout list for the device | |
77 | * @qp: the QP | |
78 | * | |
79 | * XXX Use a simple list for now. We might need a priority | |
80 | * queue if we have lots of QPs waiting for RNR timeouts | |
81 | * but that should be rare. | |
82 | */ | |
83 | void ipath_insert_rnr_queue(struct ipath_qp *qp) | |
84 | { | |
85 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
86 | unsigned long flags; | |
87 | ||
88 | spin_lock_irqsave(&dev->pending_lock, flags); | |
89 | if (list_empty(&dev->rnrwait)) | |
90 | list_add(&qp->timerwait, &dev->rnrwait); | |
91 | else { | |
92 | struct list_head *l = &dev->rnrwait; | |
93 | struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp, | |
94 | timerwait); | |
95 | ||
96 | while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) { | |
97 | qp->s_rnr_timeout -= nqp->s_rnr_timeout; | |
98 | l = l->next; | |
99 | if (l->next == &dev->rnrwait) | |
100 | break; | |
101 | nqp = list_entry(l->next, struct ipath_qp, | |
102 | timerwait); | |
103 | } | |
104 | list_add(&qp->timerwait, l); | |
105 | } | |
106 | spin_unlock_irqrestore(&dev->pending_lock, flags); | |
107 | } | |
108 | ||
373d9915 RC |
109 | static int init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe) |
110 | { | |
373d9915 RC |
111 | int user = to_ipd(qp->ibqp.pd)->user; |
112 | int i, j, ret; | |
113 | struct ib_wc wc; | |
114 | ||
115 | qp->r_len = 0; | |
116 | for (i = j = 0; i < wqe->num_sge; i++) { | |
117 | if (wqe->sg_list[i].length == 0) | |
118 | continue; | |
119 | /* Check LKEY */ | |
120 | if ((user && wqe->sg_list[i].lkey == 0) || | |
6a553af2 | 121 | !ipath_lkey_ok(qp, &qp->r_sg_list[j], &wqe->sg_list[i], |
373d9915 RC |
122 | IB_ACCESS_LOCAL_WRITE)) |
123 | goto bad_lkey; | |
124 | qp->r_len += wqe->sg_list[i].length; | |
125 | j++; | |
126 | } | |
127 | qp->r_sge.sge = qp->r_sg_list[0]; | |
128 | qp->r_sge.sg_list = qp->r_sg_list + 1; | |
129 | qp->r_sge.num_sge = j; | |
130 | ret = 1; | |
131 | goto bail; | |
132 | ||
133 | bad_lkey: | |
134 | wc.wr_id = wqe->wr_id; | |
135 | wc.status = IB_WC_LOC_PROT_ERR; | |
136 | wc.opcode = IB_WC_RECV; | |
137 | wc.vendor_err = 0; | |
138 | wc.byte_len = 0; | |
139 | wc.imm_data = 0; | |
062dbb69 | 140 | wc.qp = &qp->ibqp; |
373d9915 RC |
141 | wc.src_qp = 0; |
142 | wc.wc_flags = 0; | |
143 | wc.pkey_index = 0; | |
144 | wc.slid = 0; | |
145 | wc.sl = 0; | |
146 | wc.dlid_path_bits = 0; | |
147 | wc.port_num = 0; | |
148 | /* Signal solicited completion event. */ | |
149 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); | |
150 | ret = 0; | |
151 | bail: | |
152 | return ret; | |
153 | } | |
154 | ||
e28c00ad BS |
155 | /** |
156 | * ipath_get_rwqe - copy the next RWQE into the QP's RWQE | |
157 | * @qp: the QP | |
158 | * @wr_id_only: update wr_id only, not SGEs | |
159 | * | |
160 | * Return 0 if no RWQE is available, otherwise return 1. | |
161 | * | |
12eef41f | 162 | * Can be called from interrupt level. |
e28c00ad BS |
163 | */ |
164 | int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only) | |
165 | { | |
12eef41f | 166 | unsigned long flags; |
e28c00ad | 167 | struct ipath_rq *rq; |
373d9915 | 168 | struct ipath_rwq *wq; |
e28c00ad BS |
169 | struct ipath_srq *srq; |
170 | struct ipath_rwqe *wqe; | |
373d9915 RC |
171 | void (*handler)(struct ib_event *, void *); |
172 | u32 tail; | |
173 | int ret; | |
e28c00ad | 174 | |
373d9915 RC |
175 | if (qp->ibqp.srq) { |
176 | srq = to_isrq(qp->ibqp.srq); | |
177 | handler = srq->ibsrq.event_handler; | |
178 | rq = &srq->rq; | |
179 | } else { | |
180 | srq = NULL; | |
181 | handler = NULL; | |
e28c00ad | 182 | rq = &qp->r_rq; |
e28c00ad BS |
183 | } |
184 | ||
12eef41f | 185 | spin_lock_irqsave(&rq->lock, flags); |
373d9915 RC |
186 | wq = rq->wq; |
187 | tail = wq->tail; | |
188 | /* Validate tail before using it since it is user writable. */ | |
189 | if (tail >= rq->size) | |
190 | tail = 0; | |
191 | do { | |
192 | if (unlikely(tail == wq->head)) { | |
193 | spin_unlock_irqrestore(&rq->lock, flags); | |
194 | ret = 0; | |
195 | goto bail; | |
196 | } | |
197 | wqe = get_rwqe_ptr(rq, tail); | |
198 | if (++tail >= rq->size) | |
199 | tail = 0; | |
200 | } while (!wr_id_only && !init_sge(qp, wqe)); | |
e28c00ad | 201 | qp->r_wr_id = wqe->wr_id; |
373d9915 RC |
202 | wq->tail = tail; |
203 | ||
204 | ret = 1; | |
9f9630d5 | 205 | qp->r_wrid_valid = 1; |
373d9915 | 206 | if (handler) { |
e28c00ad BS |
207 | u32 n; |
208 | ||
373d9915 RC |
209 | /* |
210 | * validate head pointer value and compute | |
211 | * the number of remaining WQEs. | |
212 | */ | |
213 | n = wq->head; | |
214 | if (n >= rq->size) | |
215 | n = 0; | |
216 | if (n < tail) | |
217 | n += rq->size - tail; | |
e28c00ad | 218 | else |
373d9915 | 219 | n -= tail; |
e28c00ad | 220 | if (n < srq->limit) { |
373d9915 RC |
221 | struct ib_event ev; |
222 | ||
e28c00ad | 223 | srq->limit = 0; |
12eef41f | 224 | spin_unlock_irqrestore(&rq->lock, flags); |
e28c00ad BS |
225 | ev.device = qp->ibqp.device; |
226 | ev.element.srq = qp->ibqp.srq; | |
227 | ev.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
373d9915 | 228 | handler(&ev, srq->ibsrq.srq_context); |
12eef41f BS |
229 | goto bail; |
230 | } | |
231 | } | |
12eef41f | 232 | spin_unlock_irqrestore(&rq->lock, flags); |
373d9915 | 233 | |
e28c00ad BS |
234 | bail: |
235 | return ret; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ipath_ruc_loopback - handle UC and RC lookback requests | |
240 | * @sqp: the loopback QP | |
e28c00ad BS |
241 | * |
242 | * This is called from ipath_do_uc_send() or ipath_do_rc_send() to | |
243 | * forward a WQE addressed to the same HCA. | |
244 | * Note that although we are single threaded due to the tasklet, we still | |
245 | * have to protect against post_send(). We don't have to worry about | |
246 | * receive interrupts since this is a connected protocol and all packets | |
247 | * will pass through here. | |
248 | */ | |
ddd4bb22 | 249 | static void ipath_ruc_loopback(struct ipath_qp *sqp) |
e28c00ad BS |
250 | { |
251 | struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); | |
252 | struct ipath_qp *qp; | |
253 | struct ipath_swqe *wqe; | |
254 | struct ipath_sge *sge; | |
255 | unsigned long flags; | |
ddd4bb22 | 256 | struct ib_wc wc; |
e28c00ad | 257 | u64 sdata; |
3859e39d | 258 | atomic64_t *maddr; |
e28c00ad BS |
259 | |
260 | qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn); | |
261 | if (!qp) { | |
262 | dev->n_pkt_drops++; | |
263 | return; | |
264 | } | |
265 | ||
266 | again: | |
267 | spin_lock_irqsave(&sqp->s_lock, flags); | |
268 | ||
7b21d26d RC |
269 | if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK) || |
270 | qp->s_rnr_timeout) { | |
e28c00ad BS |
271 | spin_unlock_irqrestore(&sqp->s_lock, flags); |
272 | goto done; | |
273 | } | |
274 | ||
275 | /* Get the next send request. */ | |
276 | if (sqp->s_last == sqp->s_head) { | |
277 | /* Send work queue is empty. */ | |
278 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
279 | goto done; | |
280 | } | |
281 | ||
282 | /* | |
283 | * We can rely on the entry not changing without the s_lock | |
284 | * being held until we update s_last. | |
285 | */ | |
286 | wqe = get_swqe_ptr(sqp, sqp->s_last); | |
287 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
288 | ||
ddd4bb22 BS |
289 | wc.wc_flags = 0; |
290 | wc.imm_data = 0; | |
e28c00ad BS |
291 | |
292 | sqp->s_sge.sge = wqe->sg_list[0]; | |
293 | sqp->s_sge.sg_list = wqe->sg_list + 1; | |
294 | sqp->s_sge.num_sge = wqe->wr.num_sge; | |
295 | sqp->s_len = wqe->length; | |
296 | switch (wqe->wr.opcode) { | |
297 | case IB_WR_SEND_WITH_IMM: | |
ddd4bb22 BS |
298 | wc.wc_flags = IB_WC_WITH_IMM; |
299 | wc.imm_data = wqe->wr.imm_data; | |
e28c00ad BS |
300 | /* FALLTHROUGH */ |
301 | case IB_WR_SEND: | |
e28c00ad BS |
302 | if (!ipath_get_rwqe(qp, 0)) { |
303 | rnr_nak: | |
e28c00ad BS |
304 | /* Handle RNR NAK */ |
305 | if (qp->ibqp.qp_type == IB_QPT_UC) | |
306 | goto send_comp; | |
307 | if (sqp->s_rnr_retry == 0) { | |
ddd4bb22 | 308 | wc.status = IB_WC_RNR_RETRY_EXC_ERR; |
e28c00ad BS |
309 | goto err; |
310 | } | |
311 | if (sqp->s_rnr_retry_cnt < 7) | |
312 | sqp->s_rnr_retry--; | |
313 | dev->n_rnr_naks++; | |
314 | sqp->s_rnr_timeout = | |
3859e39d | 315 | ib_ipath_rnr_table[qp->r_min_rnr_timer]; |
e28c00ad BS |
316 | ipath_insert_rnr_queue(sqp); |
317 | goto done; | |
318 | } | |
e28c00ad BS |
319 | break; |
320 | ||
321 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
ddd4bb22 BS |
322 | wc.wc_flags = IB_WC_WITH_IMM; |
323 | wc.imm_data = wqe->wr.imm_data; | |
e28c00ad BS |
324 | if (!ipath_get_rwqe(qp, 1)) |
325 | goto rnr_nak; | |
e28c00ad BS |
326 | /* FALLTHROUGH */ |
327 | case IB_WR_RDMA_WRITE: | |
328 | if (wqe->length == 0) | |
329 | break; | |
6a553af2 | 330 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length, |
e28c00ad BS |
331 | wqe->wr.wr.rdma.remote_addr, |
332 | wqe->wr.wr.rdma.rkey, | |
333 | IB_ACCESS_REMOTE_WRITE))) { | |
334 | acc_err: | |
ddd4bb22 | 335 | wc.status = IB_WC_REM_ACCESS_ERR; |
e28c00ad | 336 | err: |
ddd4bb22 BS |
337 | wc.wr_id = wqe->wr.wr_id; |
338 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
339 | wc.vendor_err = 0; | |
340 | wc.byte_len = 0; | |
062dbb69 | 341 | wc.qp = &sqp->ibqp; |
ddd4bb22 BS |
342 | wc.src_qp = sqp->remote_qpn; |
343 | wc.pkey_index = 0; | |
344 | wc.slid = sqp->remote_ah_attr.dlid; | |
345 | wc.sl = sqp->remote_ah_attr.sl; | |
346 | wc.dlid_path_bits = 0; | |
347 | wc.port_num = 0; | |
3859e39d | 348 | spin_lock_irqsave(&sqp->s_lock, flags); |
ddd4bb22 | 349 | ipath_sqerror_qp(sqp, &wc); |
3859e39d | 350 | spin_unlock_irqrestore(&sqp->s_lock, flags); |
e28c00ad BS |
351 | goto done; |
352 | } | |
353 | break; | |
354 | ||
355 | case IB_WR_RDMA_READ: | |
3859e39d RC |
356 | if (unlikely(!(qp->qp_access_flags & |
357 | IB_ACCESS_REMOTE_READ))) | |
358 | goto acc_err; | |
6a553af2 | 359 | if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length, |
e28c00ad BS |
360 | wqe->wr.wr.rdma.remote_addr, |
361 | wqe->wr.wr.rdma.rkey, | |
362 | IB_ACCESS_REMOTE_READ))) | |
363 | goto acc_err; | |
e28c00ad BS |
364 | qp->r_sge.sge = wqe->sg_list[0]; |
365 | qp->r_sge.sg_list = wqe->sg_list + 1; | |
366 | qp->r_sge.num_sge = wqe->wr.num_sge; | |
367 | break; | |
368 | ||
369 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
370 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
3859e39d RC |
371 | if (unlikely(!(qp->qp_access_flags & |
372 | IB_ACCESS_REMOTE_ATOMIC))) | |
373 | goto acc_err; | |
6a553af2 | 374 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64), |
3859e39d RC |
375 | wqe->wr.wr.atomic.remote_addr, |
376 | wqe->wr.wr.atomic.rkey, | |
e28c00ad BS |
377 | IB_ACCESS_REMOTE_ATOMIC))) |
378 | goto acc_err; | |
379 | /* Perform atomic OP and save result. */ | |
3859e39d RC |
380 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
381 | sdata = wqe->wr.wr.atomic.compare_add; | |
382 | *(u64 *) sqp->s_sge.sge.vaddr = | |
383 | (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? | |
384 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
385 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
386 | sdata, wqe->wr.wr.atomic.swap); | |
e28c00ad BS |
387 | goto send_comp; |
388 | ||
389 | default: | |
390 | goto done; | |
391 | } | |
392 | ||
393 | sge = &sqp->s_sge.sge; | |
394 | while (sqp->s_len) { | |
395 | u32 len = sqp->s_len; | |
396 | ||
397 | if (len > sge->length) | |
398 | len = sge->length; | |
399 | BUG_ON(len == 0); | |
400 | ipath_copy_sge(&qp->r_sge, sge->vaddr, len); | |
401 | sge->vaddr += len; | |
402 | sge->length -= len; | |
403 | sge->sge_length -= len; | |
404 | if (sge->sge_length == 0) { | |
405 | if (--sqp->s_sge.num_sge) | |
406 | *sge = *sqp->s_sge.sg_list++; | |
407 | } else if (sge->length == 0 && sge->mr != NULL) { | |
408 | if (++sge->n >= IPATH_SEGSZ) { | |
409 | if (++sge->m >= sge->mr->mapsz) | |
410 | break; | |
411 | sge->n = 0; | |
412 | } | |
413 | sge->vaddr = | |
414 | sge->mr->map[sge->m]->segs[sge->n].vaddr; | |
415 | sge->length = | |
416 | sge->mr->map[sge->m]->segs[sge->n].length; | |
417 | } | |
418 | sqp->s_len -= len; | |
419 | } | |
420 | ||
421 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE || | |
422 | wqe->wr.opcode == IB_WR_RDMA_READ) | |
423 | goto send_comp; | |
424 | ||
425 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) | |
ddd4bb22 | 426 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; |
e28c00ad | 427 | else |
ddd4bb22 BS |
428 | wc.opcode = IB_WC_RECV; |
429 | wc.wr_id = qp->r_wr_id; | |
430 | wc.status = IB_WC_SUCCESS; | |
431 | wc.vendor_err = 0; | |
432 | wc.byte_len = wqe->length; | |
062dbb69 | 433 | wc.qp = &qp->ibqp; |
ddd4bb22 | 434 | wc.src_qp = qp->remote_qpn; |
e28c00ad | 435 | /* XXX do we know which pkey matched? Only needed for GSI. */ |
ddd4bb22 BS |
436 | wc.pkey_index = 0; |
437 | wc.slid = qp->remote_ah_attr.dlid; | |
438 | wc.sl = qp->remote_ah_attr.sl; | |
439 | wc.dlid_path_bits = 0; | |
e28c00ad | 440 | /* Signal completion event if the solicited bit is set. */ |
ddd4bb22 | 441 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, |
e28c00ad BS |
442 | wqe->wr.send_flags & IB_SEND_SOLICITED); |
443 | ||
444 | send_comp: | |
445 | sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; | |
446 | ||
3859e39d | 447 | if (!(sqp->s_flags & IPATH_S_SIGNAL_REQ_WR) || |
e28c00ad | 448 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { |
ddd4bb22 BS |
449 | wc.wr_id = wqe->wr.wr_id; |
450 | wc.status = IB_WC_SUCCESS; | |
451 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
452 | wc.vendor_err = 0; | |
453 | wc.byte_len = wqe->length; | |
062dbb69 | 454 | wc.qp = &sqp->ibqp; |
ddd4bb22 BS |
455 | wc.src_qp = 0; |
456 | wc.pkey_index = 0; | |
457 | wc.slid = 0; | |
458 | wc.sl = 0; | |
459 | wc.dlid_path_bits = 0; | |
460 | wc.port_num = 0; | |
461 | ipath_cq_enter(to_icq(sqp->ibqp.send_cq), &wc, 0); | |
e28c00ad BS |
462 | } |
463 | ||
464 | /* Update s_last now that we are finished with the SWQE */ | |
465 | spin_lock_irqsave(&sqp->s_lock, flags); | |
466 | if (++sqp->s_last >= sqp->s_size) | |
467 | sqp->s_last = 0; | |
468 | spin_unlock_irqrestore(&sqp->s_lock, flags); | |
469 | goto again; | |
470 | ||
471 | done: | |
472 | if (atomic_dec_and_test(&qp->refcount)) | |
473 | wake_up(&qp->wait); | |
474 | } | |
475 | ||
34b2aafe BS |
476 | static int want_buffer(struct ipath_devdata *dd) |
477 | { | |
478 | set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl); | |
479 | ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, | |
480 | dd->ipath_sendctrl); | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
e28c00ad BS |
485 | /** |
486 | * ipath_no_bufs_available - tell the layer driver we need buffers | |
487 | * @qp: the QP that caused the problem | |
488 | * @dev: the device we ran out of buffers on | |
489 | * | |
490 | * Called when we run out of PIO buffers. | |
491 | */ | |
492 | void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev) | |
493 | { | |
494 | unsigned long flags; | |
495 | ||
496 | spin_lock_irqsave(&dev->pending_lock, flags); | |
94b8d9f9 | 497 | if (list_empty(&qp->piowait)) |
e28c00ad BS |
498 | list_add_tail(&qp->piowait, &dev->piowait); |
499 | spin_unlock_irqrestore(&dev->pending_lock, flags); | |
500 | /* | |
34b2aafe | 501 | * Note that as soon as want_buffer() is called and |
e28c00ad BS |
502 | * possibly before it returns, ipath_ib_piobufavail() |
503 | * could be called. If we are still in the tasklet function, | |
504 | * tasklet_hi_schedule() will not call us until the next time | |
505 | * tasklet_hi_schedule() is called. | |
506 | * We clear the tasklet flag now since we are committing to return | |
507 | * from the tasklet function. | |
508 | */ | |
3859e39d | 509 | clear_bit(IPATH_S_BUSY, &qp->s_busy); |
e28c00ad | 510 | tasklet_unlock(&qp->s_task); |
34b2aafe | 511 | want_buffer(dev->dd); |
e28c00ad BS |
512 | dev->n_piowait++; |
513 | } | |
514 | ||
515 | /** | |
ddd4bb22 | 516 | * ipath_post_ruc_send - post RC and UC sends |
e28c00ad BS |
517 | * @qp: the QP to post on |
518 | * @wr: the work request to send | |
519 | */ | |
ddd4bb22 | 520 | int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr) |
e28c00ad BS |
521 | { |
522 | struct ipath_swqe *wqe; | |
523 | unsigned long flags; | |
524 | u32 next; | |
525 | int i, j; | |
526 | int acc; | |
527 | int ret; | |
528 | ||
529 | /* | |
530 | * Don't allow RDMA reads or atomic operations on UC or | |
531 | * undefined operations. | |
532 | * Make sure buffer is large enough to hold the result for atomics. | |
533 | */ | |
534 | if (qp->ibqp.qp_type == IB_QPT_UC) { | |
535 | if ((unsigned) wr->opcode >= IB_WR_RDMA_READ) { | |
536 | ret = -EINVAL; | |
537 | goto bail; | |
538 | } | |
539 | } else if ((unsigned) wr->opcode > IB_WR_ATOMIC_FETCH_AND_ADD) { | |
540 | ret = -EINVAL; | |
541 | goto bail; | |
542 | } else if (wr->opcode >= IB_WR_ATOMIC_CMP_AND_SWP && | |
543 | (wr->num_sge == 0 || | |
544 | wr->sg_list[0].length < sizeof(u64) || | |
545 | wr->sg_list[0].addr & (sizeof(u64) - 1))) { | |
546 | ret = -EINVAL; | |
547 | goto bail; | |
3859e39d RC |
548 | } else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic) { |
549 | ret = -EINVAL; | |
550 | goto bail; | |
e28c00ad BS |
551 | } |
552 | /* IB spec says that num_sge == 0 is OK. */ | |
553 | if (wr->num_sge > qp->s_max_sge) { | |
554 | ret = -ENOMEM; | |
555 | goto bail; | |
556 | } | |
557 | spin_lock_irqsave(&qp->s_lock, flags); | |
558 | next = qp->s_head + 1; | |
559 | if (next >= qp->s_size) | |
560 | next = 0; | |
561 | if (next == qp->s_last) { | |
562 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
563 | ret = -EINVAL; | |
564 | goto bail; | |
565 | } | |
566 | ||
567 | wqe = get_swqe_ptr(qp, qp->s_head); | |
568 | wqe->wr = *wr; | |
569 | wqe->ssn = qp->s_ssn++; | |
570 | wqe->sg_list[0].mr = NULL; | |
571 | wqe->sg_list[0].vaddr = NULL; | |
572 | wqe->sg_list[0].length = 0; | |
573 | wqe->sg_list[0].sge_length = 0; | |
574 | wqe->length = 0; | |
575 | acc = wr->opcode >= IB_WR_RDMA_READ ? IB_ACCESS_LOCAL_WRITE : 0; | |
576 | for (i = 0, j = 0; i < wr->num_sge; i++) { | |
577 | if (to_ipd(qp->ibqp.pd)->user && wr->sg_list[i].lkey == 0) { | |
578 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
579 | ret = -EINVAL; | |
580 | goto bail; | |
581 | } | |
582 | if (wr->sg_list[i].length == 0) | |
583 | continue; | |
6a553af2 | 584 | if (!ipath_lkey_ok(qp, &wqe->sg_list[j], &wr->sg_list[i], |
e28c00ad BS |
585 | acc)) { |
586 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
587 | ret = -EINVAL; | |
588 | goto bail; | |
589 | } | |
590 | wqe->length += wr->sg_list[i].length; | |
591 | j++; | |
592 | } | |
593 | wqe->wr.num_sge = j; | |
594 | qp->s_head = next; | |
e28c00ad BS |
595 | spin_unlock_irqrestore(&qp->s_lock, flags); |
596 | ||
ddd4bb22 | 597 | ipath_do_ruc_send((unsigned long) qp); |
e28c00ad BS |
598 | |
599 | ret = 0; | |
600 | ||
601 | bail: | |
602 | return ret; | |
603 | } | |
ddd4bb22 BS |
604 | |
605 | /** | |
606 | * ipath_make_grh - construct a GRH header | |
607 | * @dev: a pointer to the ipath device | |
608 | * @hdr: a pointer to the GRH header being constructed | |
609 | * @grh: the global route address to send to | |
610 | * @hwords: the number of 32 bit words of header being sent | |
611 | * @nwords: the number of 32 bit words of data being sent | |
612 | * | |
613 | * Return the size of the header in 32 bit words. | |
614 | */ | |
615 | u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, | |
616 | struct ib_global_route *grh, u32 hwords, u32 nwords) | |
617 | { | |
618 | hdr->version_tclass_flow = | |
619 | cpu_to_be32((6 << 28) | | |
620 | (grh->traffic_class << 20) | | |
621 | grh->flow_label); | |
622 | hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); | |
623 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ | |
624 | hdr->next_hdr = 0x1B; | |
625 | hdr->hop_limit = grh->hop_limit; | |
626 | /* The SGID is 32-bit aligned. */ | |
627 | hdr->sgid.global.subnet_prefix = dev->gid_prefix; | |
34b2aafe | 628 | hdr->sgid.global.interface_id = dev->dd->ipath_guid; |
ddd4bb22 BS |
629 | hdr->dgid = grh->dgid; |
630 | ||
631 | /* GRH header size in 32-bit words. */ | |
632 | return sizeof(struct ib_grh) / sizeof(u32); | |
633 | } | |
634 | ||
635 | /** | |
636 | * ipath_do_ruc_send - perform a send on an RC or UC QP | |
637 | * @data: contains a pointer to the QP | |
638 | * | |
639 | * Process entries in the send work queue until credit or queue is | |
640 | * exhausted. Only allow one CPU to send a packet per QP (tasklet). | |
641 | * Otherwise, after we drop the QP s_lock, two threads could send | |
642 | * packets out of order. | |
643 | */ | |
644 | void ipath_do_ruc_send(unsigned long data) | |
645 | { | |
646 | struct ipath_qp *qp = (struct ipath_qp *)data; | |
647 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
648 | unsigned long flags; | |
649 | u16 lrh0; | |
650 | u32 nwords; | |
651 | u32 extra_bytes; | |
652 | u32 bth0; | |
653 | u32 bth2; | |
654 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); | |
655 | struct ipath_other_headers *ohdr; | |
656 | ||
3859e39d | 657 | if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy)) |
ddd4bb22 BS |
658 | goto bail; |
659 | ||
34b2aafe | 660 | if (unlikely(qp->remote_ah_attr.dlid == dev->dd->ipath_lid)) { |
ddd4bb22 BS |
661 | ipath_ruc_loopback(qp); |
662 | goto clear; | |
663 | } | |
664 | ||
665 | ohdr = &qp->s_hdr.u.oth; | |
666 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) | |
667 | ohdr = &qp->s_hdr.u.l.oth; | |
668 | ||
669 | again: | |
670 | /* Check for a constructed packet to be sent. */ | |
671 | if (qp->s_hdrwords != 0) { | |
672 | /* | |
673 | * If no PIO bufs are available, return. An interrupt will | |
674 | * call ipath_ib_piobufavail() when one is available. | |
675 | */ | |
676 | if (ipath_verbs_send(dev->dd, qp->s_hdrwords, | |
677 | (u32 *) &qp->s_hdr, qp->s_cur_size, | |
678 | qp->s_cur_sge)) { | |
679 | ipath_no_bufs_available(qp, dev); | |
680 | goto bail; | |
681 | } | |
682 | dev->n_unicast_xmit++; | |
683 | /* Record that we sent the packet and s_hdr is empty. */ | |
684 | qp->s_hdrwords = 0; | |
685 | } | |
686 | ||
687 | /* | |
688 | * The lock is needed to synchronize between setting | |
689 | * qp->s_ack_state, resend timer, and post_send(). | |
690 | */ | |
691 | spin_lock_irqsave(&qp->s_lock, flags); | |
692 | ||
3859e39d RC |
693 | if (!((qp->ibqp.qp_type == IB_QPT_RC) ? |
694 | ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) : | |
695 | ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) { | |
ddd4bb22 BS |
696 | /* |
697 | * Clear the busy bit before unlocking to avoid races with | |
698 | * adding new work queue items and then failing to process | |
699 | * them. | |
700 | */ | |
3859e39d | 701 | clear_bit(IPATH_S_BUSY, &qp->s_busy); |
ddd4bb22 BS |
702 | spin_unlock_irqrestore(&qp->s_lock, flags); |
703 | goto bail; | |
704 | } | |
705 | ||
706 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
707 | ||
708 | /* Construct the header. */ | |
709 | extra_bytes = (4 - qp->s_cur_size) & 3; | |
710 | nwords = (qp->s_cur_size + extra_bytes) >> 2; | |
27b678dd | 711 | lrh0 = IPATH_LRH_BTH; |
ddd4bb22 BS |
712 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { |
713 | qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, | |
714 | &qp->remote_ah_attr.grh, | |
715 | qp->s_hdrwords, nwords); | |
27b678dd | 716 | lrh0 = IPATH_LRH_GRH; |
ddd4bb22 BS |
717 | } |
718 | lrh0 |= qp->remote_ah_attr.sl << 4; | |
719 | qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); | |
720 | qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
721 | qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + | |
722 | SIZE_OF_CRC); | |
34b2aafe BS |
723 | qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid); |
724 | bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index); | |
ddd4bb22 BS |
725 | bth0 |= extra_bytes << 20; |
726 | ohdr->bth[0] = cpu_to_be32(bth0); | |
727 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
728 | ohdr->bth[2] = cpu_to_be32(bth2); | |
729 | ||
730 | /* Check for more work to do. */ | |
731 | goto again; | |
732 | ||
733 | clear: | |
3859e39d | 734 | clear_bit(IPATH_S_BUSY, &qp->s_busy); |
ddd4bb22 BS |
735 | bail: |
736 | return; | |
737 | } |