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f931551b RC |
1 | /* |
2 | * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. | |
3 | * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
34 | #include <linux/io.h> | |
35 | ||
36 | #include "qib.h" | |
37 | ||
38 | /* cut down ridiculously long IB macro names */ | |
39 | #define OP(x) IB_OPCODE_RC_##x | |
40 | ||
41 | static void rc_timeout(unsigned long arg); | |
42 | ||
43 | static u32 restart_sge(struct qib_sge_state *ss, struct qib_swqe *wqe, | |
44 | u32 psn, u32 pmtu) | |
45 | { | |
46 | u32 len; | |
47 | ||
48 | len = ((psn - wqe->psn) & QIB_PSN_MASK) * pmtu; | |
49 | ss->sge = wqe->sg_list[0]; | |
50 | ss->sg_list = wqe->sg_list + 1; | |
51 | ss->num_sge = wqe->wr.num_sge; | |
52 | ss->total_len = wqe->length; | |
53 | qib_skip_sge(ss, len, 0); | |
54 | return wqe->length - len; | |
55 | } | |
56 | ||
57 | static void start_timer(struct qib_qp *qp) | |
58 | { | |
59 | qp->s_flags |= QIB_S_TIMER; | |
60 | qp->s_timer.function = rc_timeout; | |
61 | /* 4.096 usec. * (1 << qp->timeout) */ | |
d0f2faf7 | 62 | qp->s_timer.expires = jiffies + qp->timeout_jiffies; |
f931551b RC |
63 | add_timer(&qp->s_timer); |
64 | } | |
65 | ||
66 | /** | |
67 | * qib_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) | |
68 | * @dev: the device for this QP | |
69 | * @qp: a pointer to the QP | |
70 | * @ohdr: a pointer to the IB header being constructed | |
71 | * @pmtu: the path MTU | |
72 | * | |
73 | * Return 1 if constructed; otherwise, return 0. | |
74 | * Note that we are in the responder's side of the QP context. | |
75 | * Note the QP s_lock must be held. | |
76 | */ | |
77 | static int qib_make_rc_ack(struct qib_ibdev *dev, struct qib_qp *qp, | |
78 | struct qib_other_headers *ohdr, u32 pmtu) | |
79 | { | |
80 | struct qib_ack_entry *e; | |
81 | u32 hwords; | |
82 | u32 len; | |
83 | u32 bth0; | |
84 | u32 bth2; | |
85 | ||
86 | /* Don't send an ACK if we aren't supposed to. */ | |
87 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) | |
88 | goto bail; | |
89 | ||
90 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
91 | hwords = 5; | |
92 | ||
93 | switch (qp->s_ack_state) { | |
94 | case OP(RDMA_READ_RESPONSE_LAST): | |
95 | case OP(RDMA_READ_RESPONSE_ONLY): | |
96 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
97 | if (e->rdma_sge.mr) { | |
6a82649f | 98 | qib_put_mr(e->rdma_sge.mr); |
f931551b RC |
99 | e->rdma_sge.mr = NULL; |
100 | } | |
101 | /* FALLTHROUGH */ | |
102 | case OP(ATOMIC_ACKNOWLEDGE): | |
103 | /* | |
104 | * We can increment the tail pointer now that the last | |
105 | * response has been sent instead of only being | |
106 | * constructed. | |
107 | */ | |
108 | if (++qp->s_tail_ack_queue > QIB_MAX_RDMA_ATOMIC) | |
109 | qp->s_tail_ack_queue = 0; | |
110 | /* FALLTHROUGH */ | |
111 | case OP(SEND_ONLY): | |
112 | case OP(ACKNOWLEDGE): | |
113 | /* Check for no next entry in the queue. */ | |
114 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { | |
115 | if (qp->s_flags & QIB_S_ACK_PENDING) | |
116 | goto normal; | |
117 | goto bail; | |
118 | } | |
119 | ||
120 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
121 | if (e->opcode == OP(RDMA_READ_REQUEST)) { | |
122 | /* | |
123 | * If a RDMA read response is being resent and | |
124 | * we haven't seen the duplicate request yet, | |
125 | * then stop sending the remaining responses the | |
126 | * responder has seen until the requester resends it. | |
127 | */ | |
128 | len = e->rdma_sge.sge_length; | |
129 | if (len && !e->rdma_sge.mr) { | |
130 | qp->s_tail_ack_queue = qp->r_head_ack_queue; | |
131 | goto bail; | |
132 | } | |
133 | /* Copy SGE state in case we need to resend */ | |
134 | qp->s_rdma_mr = e->rdma_sge.mr; | |
135 | if (qp->s_rdma_mr) | |
6a82649f | 136 | qib_get_mr(qp->s_rdma_mr); |
f931551b RC |
137 | qp->s_ack_rdma_sge.sge = e->rdma_sge; |
138 | qp->s_ack_rdma_sge.num_sge = 1; | |
139 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
140 | if (len > pmtu) { | |
141 | len = pmtu; | |
142 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); | |
143 | } else { | |
144 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); | |
145 | e->sent = 1; | |
146 | } | |
147 | ohdr->u.aeth = qib_compute_aeth(qp); | |
148 | hwords++; | |
149 | qp->s_ack_rdma_psn = e->psn; | |
150 | bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK; | |
151 | } else { | |
152 | /* COMPARE_SWAP or FETCH_ADD */ | |
153 | qp->s_cur_sge = NULL; | |
154 | len = 0; | |
155 | qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); | |
156 | ohdr->u.at.aeth = qib_compute_aeth(qp); | |
157 | ohdr->u.at.atomic_ack_eth[0] = | |
158 | cpu_to_be32(e->atomic_data >> 32); | |
159 | ohdr->u.at.atomic_ack_eth[1] = | |
160 | cpu_to_be32(e->atomic_data); | |
161 | hwords += sizeof(ohdr->u.at) / sizeof(u32); | |
162 | bth2 = e->psn & QIB_PSN_MASK; | |
163 | e->sent = 1; | |
164 | } | |
165 | bth0 = qp->s_ack_state << 24; | |
166 | break; | |
167 | ||
168 | case OP(RDMA_READ_RESPONSE_FIRST): | |
169 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
170 | /* FALLTHROUGH */ | |
171 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
172 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
173 | qp->s_rdma_mr = qp->s_ack_rdma_sge.sge.mr; | |
174 | if (qp->s_rdma_mr) | |
6a82649f | 175 | qib_get_mr(qp->s_rdma_mr); |
f931551b RC |
176 | len = qp->s_ack_rdma_sge.sge.sge_length; |
177 | if (len > pmtu) | |
178 | len = pmtu; | |
179 | else { | |
180 | ohdr->u.aeth = qib_compute_aeth(qp); | |
181 | hwords++; | |
182 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
183 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
184 | e->sent = 1; | |
185 | } | |
186 | bth0 = qp->s_ack_state << 24; | |
187 | bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK; | |
188 | break; | |
189 | ||
190 | default: | |
191 | normal: | |
192 | /* | |
193 | * Send a regular ACK. | |
194 | * Set the s_ack_state so we wait until after sending | |
195 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
196 | * (see above). | |
197 | */ | |
198 | qp->s_ack_state = OP(SEND_ONLY); | |
199 | qp->s_flags &= ~QIB_S_ACK_PENDING; | |
200 | qp->s_cur_sge = NULL; | |
201 | if (qp->s_nak_state) | |
202 | ohdr->u.aeth = | |
203 | cpu_to_be32((qp->r_msn & QIB_MSN_MASK) | | |
204 | (qp->s_nak_state << | |
205 | QIB_AETH_CREDIT_SHIFT)); | |
206 | else | |
207 | ohdr->u.aeth = qib_compute_aeth(qp); | |
208 | hwords++; | |
209 | len = 0; | |
210 | bth0 = OP(ACKNOWLEDGE) << 24; | |
211 | bth2 = qp->s_ack_psn & QIB_PSN_MASK; | |
212 | } | |
213 | qp->s_rdma_ack_cnt++; | |
214 | qp->s_hdrwords = hwords; | |
215 | qp->s_cur_size = len; | |
216 | qib_make_ruc_header(qp, ohdr, bth0, bth2); | |
217 | return 1; | |
218 | ||
219 | bail: | |
220 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
221 | qp->s_flags &= ~(QIB_S_RESP_PENDING | QIB_S_ACK_PENDING); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /** | |
226 | * qib_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
227 | * @qp: a pointer to the QP | |
228 | * | |
229 | * Return 1 if constructed; otherwise, return 0. | |
230 | */ | |
231 | int qib_make_rc_req(struct qib_qp *qp) | |
232 | { | |
233 | struct qib_ibdev *dev = to_idev(qp->ibqp.device); | |
234 | struct qib_other_headers *ohdr; | |
235 | struct qib_sge_state *ss; | |
236 | struct qib_swqe *wqe; | |
237 | u32 hwords; | |
238 | u32 len; | |
239 | u32 bth0; | |
240 | u32 bth2; | |
cc6ea138 | 241 | u32 pmtu = qp->pmtu; |
f931551b RC |
242 | char newreq; |
243 | unsigned long flags; | |
244 | int ret = 0; | |
245 | int delta; | |
246 | ||
1c94283d | 247 | ohdr = &qp->s_hdr->u.oth; |
f931551b | 248 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) |
1c94283d | 249 | ohdr = &qp->s_hdr->u.l.oth; |
f931551b RC |
250 | |
251 | /* | |
252 | * The lock is needed to synchronize between the sending tasklet, | |
253 | * the receive interrupt handler, and timeout resends. | |
254 | */ | |
255 | spin_lock_irqsave(&qp->s_lock, flags); | |
256 | ||
257 | /* Sending responses has higher priority over sending requests. */ | |
258 | if ((qp->s_flags & QIB_S_RESP_PENDING) && | |
259 | qib_make_rc_ack(dev, qp, ohdr, pmtu)) | |
260 | goto done; | |
261 | ||
262 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) { | |
263 | if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND)) | |
264 | goto bail; | |
265 | /* We are in the error state, flush the work request. */ | |
266 | if (qp->s_last == qp->s_head) | |
267 | goto bail; | |
268 | /* If DMAs are in progress, we can't flush immediately. */ | |
269 | if (atomic_read(&qp->s_dma_busy)) { | |
270 | qp->s_flags |= QIB_S_WAIT_DMA; | |
271 | goto bail; | |
272 | } | |
273 | wqe = get_swqe_ptr(qp, qp->s_last); | |
30ab7e23 MM |
274 | qib_send_complete(qp, wqe, qp->s_last != qp->s_acked ? |
275 | IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR); | |
276 | /* will get called again */ | |
f931551b RC |
277 | goto done; |
278 | } | |
279 | ||
280 | if (qp->s_flags & (QIB_S_WAIT_RNR | QIB_S_WAIT_ACK)) | |
281 | goto bail; | |
282 | ||
283 | if (qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) { | |
284 | if (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { | |
285 | qp->s_flags |= QIB_S_WAIT_PSN; | |
286 | goto bail; | |
287 | } | |
288 | qp->s_sending_psn = qp->s_psn; | |
289 | qp->s_sending_hpsn = qp->s_psn - 1; | |
290 | } | |
291 | ||
292 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
293 | hwords = 5; | |
294 | bth0 = 0; | |
295 | ||
296 | /* Send a request. */ | |
297 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
298 | switch (qp->s_state) { | |
299 | default: | |
300 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_NEXT_SEND_OK)) | |
301 | goto bail; | |
302 | /* | |
303 | * Resend an old request or start a new one. | |
304 | * | |
305 | * We keep track of the current SWQE so that | |
306 | * we don't reset the "furthest progress" state | |
307 | * if we need to back up. | |
308 | */ | |
309 | newreq = 0; | |
310 | if (qp->s_cur == qp->s_tail) { | |
311 | /* Check if send work queue is empty. */ | |
312 | if (qp->s_tail == qp->s_head) | |
313 | goto bail; | |
314 | /* | |
315 | * If a fence is requested, wait for previous | |
316 | * RDMA read and atomic operations to finish. | |
317 | */ | |
318 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
319 | qp->s_num_rd_atomic) { | |
320 | qp->s_flags |= QIB_S_WAIT_FENCE; | |
321 | goto bail; | |
322 | } | |
323 | wqe->psn = qp->s_next_psn; | |
324 | newreq = 1; | |
325 | } | |
326 | /* | |
327 | * Note that we have to be careful not to modify the | |
328 | * original work request since we may need to resend | |
329 | * it. | |
330 | */ | |
331 | len = wqe->length; | |
332 | ss = &qp->s_sge; | |
333 | bth2 = qp->s_psn & QIB_PSN_MASK; | |
334 | switch (wqe->wr.opcode) { | |
335 | case IB_WR_SEND: | |
336 | case IB_WR_SEND_WITH_IMM: | |
337 | /* If no credit, return. */ | |
338 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT) && | |
339 | qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { | |
340 | qp->s_flags |= QIB_S_WAIT_SSN_CREDIT; | |
341 | goto bail; | |
342 | } | |
343 | wqe->lpsn = wqe->psn; | |
344 | if (len > pmtu) { | |
345 | wqe->lpsn += (len - 1) / pmtu; | |
346 | qp->s_state = OP(SEND_FIRST); | |
347 | len = pmtu; | |
348 | break; | |
349 | } | |
350 | if (wqe->wr.opcode == IB_WR_SEND) | |
351 | qp->s_state = OP(SEND_ONLY); | |
352 | else { | |
353 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); | |
354 | /* Immediate data comes after the BTH */ | |
355 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
356 | hwords += 1; | |
357 | } | |
358 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
359 | bth0 |= IB_BTH_SOLICITED; | |
360 | bth2 |= IB_BTH_REQ_ACK; | |
361 | if (++qp->s_cur == qp->s_size) | |
362 | qp->s_cur = 0; | |
363 | break; | |
364 | ||
365 | case IB_WR_RDMA_WRITE: | |
366 | if (newreq && !(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) | |
367 | qp->s_lsn++; | |
368 | /* FALLTHROUGH */ | |
369 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
370 | /* If no credit, return. */ | |
371 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT) && | |
372 | qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { | |
373 | qp->s_flags |= QIB_S_WAIT_SSN_CREDIT; | |
374 | goto bail; | |
375 | } | |
376 | ohdr->u.rc.reth.vaddr = | |
377 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
378 | ohdr->u.rc.reth.rkey = | |
379 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
380 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
381 | hwords += sizeof(struct ib_reth) / sizeof(u32); | |
382 | wqe->lpsn = wqe->psn; | |
383 | if (len > pmtu) { | |
384 | wqe->lpsn += (len - 1) / pmtu; | |
385 | qp->s_state = OP(RDMA_WRITE_FIRST); | |
386 | len = pmtu; | |
387 | break; | |
388 | } | |
389 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
390 | qp->s_state = OP(RDMA_WRITE_ONLY); | |
391 | else { | |
392 | qp->s_state = | |
393 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
394 | /* Immediate data comes after RETH */ | |
395 | ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; | |
396 | hwords += 1; | |
397 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
398 | bth0 |= IB_BTH_SOLICITED; | |
399 | } | |
400 | bth2 |= IB_BTH_REQ_ACK; | |
401 | if (++qp->s_cur == qp->s_size) | |
402 | qp->s_cur = 0; | |
403 | break; | |
404 | ||
405 | case IB_WR_RDMA_READ: | |
406 | /* | |
407 | * Don't allow more operations to be started | |
408 | * than the QP limits allow. | |
409 | */ | |
410 | if (newreq) { | |
411 | if (qp->s_num_rd_atomic >= | |
412 | qp->s_max_rd_atomic) { | |
413 | qp->s_flags |= QIB_S_WAIT_RDMAR; | |
414 | goto bail; | |
415 | } | |
416 | qp->s_num_rd_atomic++; | |
417 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) | |
418 | qp->s_lsn++; | |
419 | /* | |
420 | * Adjust s_next_psn to count the | |
421 | * expected number of responses. | |
422 | */ | |
423 | if (len > pmtu) | |
424 | qp->s_next_psn += (len - 1) / pmtu; | |
425 | wqe->lpsn = qp->s_next_psn++; | |
426 | } | |
427 | ohdr->u.rc.reth.vaddr = | |
428 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
429 | ohdr->u.rc.reth.rkey = | |
430 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
431 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
432 | qp->s_state = OP(RDMA_READ_REQUEST); | |
433 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
434 | ss = NULL; | |
435 | len = 0; | |
436 | bth2 |= IB_BTH_REQ_ACK; | |
437 | if (++qp->s_cur == qp->s_size) | |
438 | qp->s_cur = 0; | |
439 | break; | |
440 | ||
441 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
442 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
443 | /* | |
444 | * Don't allow more operations to be started | |
445 | * than the QP limits allow. | |
446 | */ | |
447 | if (newreq) { | |
448 | if (qp->s_num_rd_atomic >= | |
449 | qp->s_max_rd_atomic) { | |
450 | qp->s_flags |= QIB_S_WAIT_RDMAR; | |
451 | goto bail; | |
452 | } | |
453 | qp->s_num_rd_atomic++; | |
454 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) | |
455 | qp->s_lsn++; | |
456 | wqe->lpsn = wqe->psn; | |
457 | } | |
458 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { | |
459 | qp->s_state = OP(COMPARE_SWAP); | |
460 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
461 | wqe->wr.wr.atomic.swap); | |
462 | ohdr->u.atomic_eth.compare_data = cpu_to_be64( | |
463 | wqe->wr.wr.atomic.compare_add); | |
464 | } else { | |
465 | qp->s_state = OP(FETCH_ADD); | |
466 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
467 | wqe->wr.wr.atomic.compare_add); | |
468 | ohdr->u.atomic_eth.compare_data = 0; | |
469 | } | |
470 | ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32( | |
471 | wqe->wr.wr.atomic.remote_addr >> 32); | |
472 | ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32( | |
473 | wqe->wr.wr.atomic.remote_addr); | |
474 | ohdr->u.atomic_eth.rkey = cpu_to_be32( | |
475 | wqe->wr.wr.atomic.rkey); | |
476 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); | |
477 | ss = NULL; | |
478 | len = 0; | |
479 | bth2 |= IB_BTH_REQ_ACK; | |
480 | if (++qp->s_cur == qp->s_size) | |
481 | qp->s_cur = 0; | |
482 | break; | |
483 | ||
484 | default: | |
485 | goto bail; | |
486 | } | |
487 | qp->s_sge.sge = wqe->sg_list[0]; | |
488 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
489 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
490 | qp->s_sge.total_len = wqe->length; | |
491 | qp->s_len = wqe->length; | |
492 | if (newreq) { | |
493 | qp->s_tail++; | |
494 | if (qp->s_tail >= qp->s_size) | |
495 | qp->s_tail = 0; | |
496 | } | |
497 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
498 | qp->s_psn = wqe->lpsn + 1; | |
499 | else { | |
500 | qp->s_psn++; | |
501 | if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0) | |
502 | qp->s_next_psn = qp->s_psn; | |
503 | } | |
504 | break; | |
505 | ||
506 | case OP(RDMA_READ_RESPONSE_FIRST): | |
507 | /* | |
508 | * qp->s_state is normally set to the opcode of the | |
509 | * last packet constructed for new requests and therefore | |
510 | * is never set to RDMA read response. | |
511 | * RDMA_READ_RESPONSE_FIRST is used by the ACK processing | |
512 | * thread to indicate a SEND needs to be restarted from an | |
513 | * earlier PSN without interferring with the sending thread. | |
514 | * See qib_restart_rc(). | |
515 | */ | |
516 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
517 | /* FALLTHROUGH */ | |
518 | case OP(SEND_FIRST): | |
519 | qp->s_state = OP(SEND_MIDDLE); | |
520 | /* FALLTHROUGH */ | |
521 | case OP(SEND_MIDDLE): | |
522 | bth2 = qp->s_psn++ & QIB_PSN_MASK; | |
523 | if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0) | |
524 | qp->s_next_psn = qp->s_psn; | |
525 | ss = &qp->s_sge; | |
526 | len = qp->s_len; | |
527 | if (len > pmtu) { | |
528 | len = pmtu; | |
529 | break; | |
530 | } | |
531 | if (wqe->wr.opcode == IB_WR_SEND) | |
532 | qp->s_state = OP(SEND_LAST); | |
533 | else { | |
534 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
535 | /* Immediate data comes after the BTH */ | |
536 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
537 | hwords += 1; | |
538 | } | |
539 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
540 | bth0 |= IB_BTH_SOLICITED; | |
541 | bth2 |= IB_BTH_REQ_ACK; | |
542 | qp->s_cur++; | |
543 | if (qp->s_cur >= qp->s_size) | |
544 | qp->s_cur = 0; | |
545 | break; | |
546 | ||
547 | case OP(RDMA_READ_RESPONSE_LAST): | |
548 | /* | |
549 | * qp->s_state is normally set to the opcode of the | |
550 | * last packet constructed for new requests and therefore | |
551 | * is never set to RDMA read response. | |
552 | * RDMA_READ_RESPONSE_LAST is used by the ACK processing | |
553 | * thread to indicate a RDMA write needs to be restarted from | |
554 | * an earlier PSN without interferring with the sending thread. | |
555 | * See qib_restart_rc(). | |
556 | */ | |
557 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
558 | /* FALLTHROUGH */ | |
559 | case OP(RDMA_WRITE_FIRST): | |
560 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
561 | /* FALLTHROUGH */ | |
562 | case OP(RDMA_WRITE_MIDDLE): | |
563 | bth2 = qp->s_psn++ & QIB_PSN_MASK; | |
564 | if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0) | |
565 | qp->s_next_psn = qp->s_psn; | |
566 | ss = &qp->s_sge; | |
567 | len = qp->s_len; | |
568 | if (len > pmtu) { | |
569 | len = pmtu; | |
570 | break; | |
571 | } | |
572 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
573 | qp->s_state = OP(RDMA_WRITE_LAST); | |
574 | else { | |
575 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
576 | /* Immediate data comes after the BTH */ | |
577 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
578 | hwords += 1; | |
579 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
580 | bth0 |= IB_BTH_SOLICITED; | |
581 | } | |
582 | bth2 |= IB_BTH_REQ_ACK; | |
583 | qp->s_cur++; | |
584 | if (qp->s_cur >= qp->s_size) | |
585 | qp->s_cur = 0; | |
586 | break; | |
587 | ||
588 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
589 | /* | |
590 | * qp->s_state is normally set to the opcode of the | |
591 | * last packet constructed for new requests and therefore | |
592 | * is never set to RDMA read response. | |
593 | * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing | |
594 | * thread to indicate a RDMA read needs to be restarted from | |
595 | * an earlier PSN without interferring with the sending thread. | |
596 | * See qib_restart_rc(). | |
597 | */ | |
598 | len = ((qp->s_psn - wqe->psn) & QIB_PSN_MASK) * pmtu; | |
599 | ohdr->u.rc.reth.vaddr = | |
600 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len); | |
601 | ohdr->u.rc.reth.rkey = | |
602 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
603 | ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len); | |
604 | qp->s_state = OP(RDMA_READ_REQUEST); | |
605 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
606 | bth2 = (qp->s_psn & QIB_PSN_MASK) | IB_BTH_REQ_ACK; | |
607 | qp->s_psn = wqe->lpsn + 1; | |
608 | ss = NULL; | |
609 | len = 0; | |
610 | qp->s_cur++; | |
611 | if (qp->s_cur == qp->s_size) | |
612 | qp->s_cur = 0; | |
613 | break; | |
614 | } | |
615 | qp->s_sending_hpsn = bth2; | |
616 | delta = (((int) bth2 - (int) wqe->psn) << 8) >> 8; | |
617 | if (delta && delta % QIB_PSN_CREDIT == 0) | |
618 | bth2 |= IB_BTH_REQ_ACK; | |
619 | if (qp->s_flags & QIB_S_SEND_ONE) { | |
620 | qp->s_flags &= ~QIB_S_SEND_ONE; | |
621 | qp->s_flags |= QIB_S_WAIT_ACK; | |
622 | bth2 |= IB_BTH_REQ_ACK; | |
623 | } | |
624 | qp->s_len -= len; | |
625 | qp->s_hdrwords = hwords; | |
626 | qp->s_cur_sge = ss; | |
627 | qp->s_cur_size = len; | |
628 | qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), bth2); | |
629 | done: | |
630 | ret = 1; | |
631 | goto unlock; | |
632 | ||
633 | bail: | |
634 | qp->s_flags &= ~QIB_S_BUSY; | |
635 | unlock: | |
636 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
637 | return ret; | |
638 | } | |
639 | ||
640 | /** | |
641 | * qib_send_rc_ack - Construct an ACK packet and send it | |
642 | * @qp: a pointer to the QP | |
643 | * | |
644 | * This is called from qib_rc_rcv() and qib_kreceive(). | |
645 | * Note that RDMA reads and atomics are handled in the | |
646 | * send side QP state and tasklet. | |
647 | */ | |
648 | void qib_send_rc_ack(struct qib_qp *qp) | |
649 | { | |
650 | struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device); | |
651 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
652 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); | |
653 | u64 pbc; | |
654 | u16 lrh0; | |
655 | u32 bth0; | |
656 | u32 hwords; | |
657 | u32 pbufn; | |
658 | u32 __iomem *piobuf; | |
659 | struct qib_ib_header hdr; | |
660 | struct qib_other_headers *ohdr; | |
661 | u32 control; | |
662 | unsigned long flags; | |
663 | ||
664 | spin_lock_irqsave(&qp->s_lock, flags); | |
665 | ||
666 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) | |
667 | goto unlock; | |
668 | ||
669 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ | |
670 | if ((qp->s_flags & QIB_S_RESP_PENDING) || qp->s_rdma_ack_cnt) | |
671 | goto queue_ack; | |
672 | ||
673 | /* Construct the header with s_lock held so APM doesn't change it. */ | |
674 | ohdr = &hdr.u.oth; | |
675 | lrh0 = QIB_LRH_BTH; | |
676 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ | |
677 | hwords = 6; | |
678 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
679 | hwords += qib_make_grh(ibp, &hdr.u.l.grh, | |
680 | &qp->remote_ah_attr.grh, hwords, 0); | |
681 | ohdr = &hdr.u.l.oth; | |
682 | lrh0 = QIB_LRH_GRH; | |
683 | } | |
684 | /* read pkey_index w/o lock (its atomic) */ | |
685 | bth0 = qib_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24); | |
686 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
687 | bth0 |= IB_BTH_MIG_REQ; | |
688 | if (qp->r_nak_state) | |
689 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & QIB_MSN_MASK) | | |
690 | (qp->r_nak_state << | |
691 | QIB_AETH_CREDIT_SHIFT)); | |
692 | else | |
693 | ohdr->u.aeth = qib_compute_aeth(qp); | |
694 | lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | | |
695 | qp->remote_ah_attr.sl << 4; | |
696 | hdr.lrh[0] = cpu_to_be16(lrh0); | |
697 | hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
698 | hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); | |
699 | hdr.lrh[3] = cpu_to_be16(ppd->lid | qp->remote_ah_attr.src_path_bits); | |
700 | ohdr->bth[0] = cpu_to_be32(bth0); | |
701 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
702 | ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & QIB_PSN_MASK); | |
703 | ||
704 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
705 | ||
706 | /* Don't try to send ACKs if the link isn't ACTIVE */ | |
707 | if (!(ppd->lflags & QIBL_LINKACTIVE)) | |
708 | goto done; | |
709 | ||
710 | control = dd->f_setpbc_control(ppd, hwords + SIZE_OF_CRC, | |
711 | qp->s_srate, lrh0 >> 12); | |
712 | /* length is + 1 for the control dword */ | |
713 | pbc = ((u64) control << 32) | (hwords + 1); | |
714 | ||
715 | piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn); | |
716 | if (!piobuf) { | |
717 | /* | |
718 | * We are out of PIO buffers at the moment. | |
719 | * Pass responsibility for sending the ACK to the | |
720 | * send tasklet so that when a PIO buffer becomes | |
721 | * available, the ACK is sent ahead of other outgoing | |
722 | * packets. | |
723 | */ | |
724 | spin_lock_irqsave(&qp->s_lock, flags); | |
725 | goto queue_ack; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Write the pbc. | |
730 | * We have to flush after the PBC for correctness | |
731 | * on some cpus or WC buffer can be written out of order. | |
732 | */ | |
733 | writeq(pbc, piobuf); | |
734 | ||
735 | if (dd->flags & QIB_PIO_FLUSH_WC) { | |
736 | u32 *hdrp = (u32 *) &hdr; | |
737 | ||
738 | qib_flush_wc(); | |
739 | qib_pio_copy(piobuf + 2, hdrp, hwords - 1); | |
740 | qib_flush_wc(); | |
741 | __raw_writel(hdrp[hwords - 1], piobuf + hwords + 1); | |
742 | } else | |
743 | qib_pio_copy(piobuf + 2, (u32 *) &hdr, hwords); | |
744 | ||
745 | if (dd->flags & QIB_USE_SPCL_TRIG) { | |
746 | u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023; | |
747 | ||
748 | qib_flush_wc(); | |
749 | __raw_writel(0xaebecede, piobuf + spcl_off); | |
750 | } | |
751 | ||
752 | qib_flush_wc(); | |
753 | qib_sendbuf_done(dd, pbufn); | |
754 | ||
7d7632ad | 755 | this_cpu_inc(ibp->pmastats->n_unicast_xmit); |
f931551b RC |
756 | goto done; |
757 | ||
758 | queue_ack: | |
759 | if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) { | |
760 | ibp->n_rc_qacks++; | |
761 | qp->s_flags |= QIB_S_ACK_PENDING | QIB_S_RESP_PENDING; | |
762 | qp->s_nak_state = qp->r_nak_state; | |
763 | qp->s_ack_psn = qp->r_ack_psn; | |
764 | ||
765 | /* Schedule the send tasklet. */ | |
766 | qib_schedule_send(qp); | |
767 | } | |
768 | unlock: | |
769 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
770 | done: | |
771 | return; | |
772 | } | |
773 | ||
774 | /** | |
775 | * reset_psn - reset the QP state to send starting from PSN | |
776 | * @qp: the QP | |
777 | * @psn: the packet sequence number to restart at | |
778 | * | |
779 | * This is called from qib_rc_rcv() to process an incoming RC ACK | |
780 | * for the given QP. | |
781 | * Called at interrupt level with the QP s_lock held. | |
782 | */ | |
783 | static void reset_psn(struct qib_qp *qp, u32 psn) | |
784 | { | |
785 | u32 n = qp->s_acked; | |
786 | struct qib_swqe *wqe = get_swqe_ptr(qp, n); | |
787 | u32 opcode; | |
788 | ||
789 | qp->s_cur = n; | |
790 | ||
791 | /* | |
792 | * If we are starting the request from the beginning, | |
793 | * let the normal send code handle initialization. | |
794 | */ | |
795 | if (qib_cmp24(psn, wqe->psn) <= 0) { | |
796 | qp->s_state = OP(SEND_LAST); | |
797 | goto done; | |
798 | } | |
799 | ||
800 | /* Find the work request opcode corresponding to the given PSN. */ | |
801 | opcode = wqe->wr.opcode; | |
802 | for (;;) { | |
803 | int diff; | |
804 | ||
805 | if (++n == qp->s_size) | |
806 | n = 0; | |
807 | if (n == qp->s_tail) | |
808 | break; | |
809 | wqe = get_swqe_ptr(qp, n); | |
810 | diff = qib_cmp24(psn, wqe->psn); | |
811 | if (diff < 0) | |
812 | break; | |
813 | qp->s_cur = n; | |
814 | /* | |
815 | * If we are starting the request from the beginning, | |
816 | * let the normal send code handle initialization. | |
817 | */ | |
818 | if (diff == 0) { | |
819 | qp->s_state = OP(SEND_LAST); | |
820 | goto done; | |
821 | } | |
822 | opcode = wqe->wr.opcode; | |
823 | } | |
824 | ||
825 | /* | |
826 | * Set the state to restart in the middle of a request. | |
827 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
828 | * See qib_make_rc_req(). | |
829 | */ | |
830 | switch (opcode) { | |
831 | case IB_WR_SEND: | |
832 | case IB_WR_SEND_WITH_IMM: | |
833 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
834 | break; | |
835 | ||
836 | case IB_WR_RDMA_WRITE: | |
837 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
838 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
839 | break; | |
840 | ||
841 | case IB_WR_RDMA_READ: | |
842 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
843 | break; | |
844 | ||
845 | default: | |
846 | /* | |
847 | * This case shouldn't happen since its only | |
848 | * one PSN per req. | |
849 | */ | |
850 | qp->s_state = OP(SEND_LAST); | |
851 | } | |
852 | done: | |
853 | qp->s_psn = psn; | |
854 | /* | |
855 | * Set QIB_S_WAIT_PSN as qib_rc_complete() may start the timer | |
856 | * asynchronously before the send tasklet can get scheduled. | |
857 | * Doing it in qib_make_rc_req() is too late. | |
858 | */ | |
859 | if ((qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) && | |
860 | (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) | |
861 | qp->s_flags |= QIB_S_WAIT_PSN; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Back up requester to resend the last un-ACKed request. | |
a5210c12 | 866 | * The QP r_lock and s_lock should be held and interrupts disabled. |
f931551b RC |
867 | */ |
868 | static void qib_restart_rc(struct qib_qp *qp, u32 psn, int wait) | |
869 | { | |
870 | struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_acked); | |
871 | struct qib_ibport *ibp; | |
872 | ||
873 | if (qp->s_retry == 0) { | |
874 | if (qp->s_mig_state == IB_MIG_ARMED) { | |
875 | qib_migrate_qp(qp); | |
876 | qp->s_retry = qp->s_retry_cnt; | |
877 | } else if (qp->s_last == qp->s_acked) { | |
878 | qib_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); | |
879 | qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
880 | return; | |
881 | } else /* XXX need to handle delayed completion */ | |
882 | return; | |
883 | } else | |
884 | qp->s_retry--; | |
885 | ||
886 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
887 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
888 | ibp->n_rc_resends++; | |
889 | else | |
890 | ibp->n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK; | |
891 | ||
892 | qp->s_flags &= ~(QIB_S_WAIT_FENCE | QIB_S_WAIT_RDMAR | | |
893 | QIB_S_WAIT_SSN_CREDIT | QIB_S_WAIT_PSN | | |
894 | QIB_S_WAIT_ACK); | |
895 | if (wait) | |
896 | qp->s_flags |= QIB_S_SEND_ONE; | |
897 | reset_psn(qp, psn); | |
898 | } | |
899 | ||
900 | /* | |
901 | * This is called from s_timer for missing responses. | |
902 | */ | |
903 | static void rc_timeout(unsigned long arg) | |
904 | { | |
905 | struct qib_qp *qp = (struct qib_qp *)arg; | |
906 | struct qib_ibport *ibp; | |
907 | unsigned long flags; | |
908 | ||
a5210c12 RC |
909 | spin_lock_irqsave(&qp->r_lock, flags); |
910 | spin_lock(&qp->s_lock); | |
f931551b RC |
911 | if (qp->s_flags & QIB_S_TIMER) { |
912 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
913 | ibp->n_rc_timeouts++; | |
914 | qp->s_flags &= ~QIB_S_TIMER; | |
915 | del_timer(&qp->s_timer); | |
916 | qib_restart_rc(qp, qp->s_last_psn + 1, 1); | |
917 | qib_schedule_send(qp); | |
918 | } | |
a5210c12 RC |
919 | spin_unlock(&qp->s_lock); |
920 | spin_unlock_irqrestore(&qp->r_lock, flags); | |
f931551b RC |
921 | } |
922 | ||
923 | /* | |
924 | * This is called from s_timer for RNR timeouts. | |
925 | */ | |
926 | void qib_rc_rnr_retry(unsigned long arg) | |
927 | { | |
928 | struct qib_qp *qp = (struct qib_qp *)arg; | |
929 | unsigned long flags; | |
930 | ||
931 | spin_lock_irqsave(&qp->s_lock, flags); | |
932 | if (qp->s_flags & QIB_S_WAIT_RNR) { | |
933 | qp->s_flags &= ~QIB_S_WAIT_RNR; | |
934 | del_timer(&qp->s_timer); | |
935 | qib_schedule_send(qp); | |
936 | } | |
937 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
938 | } | |
939 | ||
940 | /* | |
941 | * Set qp->s_sending_psn to the next PSN after the given one. | |
942 | * This would be psn+1 except when RDMA reads are present. | |
943 | */ | |
944 | static void reset_sending_psn(struct qib_qp *qp, u32 psn) | |
945 | { | |
946 | struct qib_swqe *wqe; | |
947 | u32 n = qp->s_last; | |
948 | ||
949 | /* Find the work request corresponding to the given PSN. */ | |
950 | for (;;) { | |
951 | wqe = get_swqe_ptr(qp, n); | |
952 | if (qib_cmp24(psn, wqe->lpsn) <= 0) { | |
953 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
954 | qp->s_sending_psn = wqe->lpsn + 1; | |
955 | else | |
956 | qp->s_sending_psn = psn + 1; | |
957 | break; | |
958 | } | |
959 | if (++n == qp->s_size) | |
960 | n = 0; | |
961 | if (n == qp->s_tail) | |
962 | break; | |
963 | } | |
964 | } | |
965 | ||
966 | /* | |
967 | * This should be called with the QP s_lock held and interrupts disabled. | |
968 | */ | |
969 | void qib_rc_send_complete(struct qib_qp *qp, struct qib_ib_header *hdr) | |
970 | { | |
971 | struct qib_other_headers *ohdr; | |
972 | struct qib_swqe *wqe; | |
973 | struct ib_wc wc; | |
974 | unsigned i; | |
975 | u32 opcode; | |
976 | u32 psn; | |
977 | ||
978 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND)) | |
979 | return; | |
980 | ||
981 | /* Find out where the BTH is */ | |
982 | if ((be16_to_cpu(hdr->lrh[0]) & 3) == QIB_LRH_BTH) | |
983 | ohdr = &hdr->u.oth; | |
984 | else | |
985 | ohdr = &hdr->u.l.oth; | |
986 | ||
987 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; | |
988 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
989 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
990 | WARN_ON(!qp->s_rdma_ack_cnt); | |
991 | qp->s_rdma_ack_cnt--; | |
992 | return; | |
993 | } | |
994 | ||
995 | psn = be32_to_cpu(ohdr->bth[2]); | |
996 | reset_sending_psn(qp, psn); | |
997 | ||
998 | /* | |
999 | * Start timer after a packet requesting an ACK has been sent and | |
1000 | * there are still requests that haven't been acked. | |
1001 | */ | |
1002 | if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail && | |
c0af2c05 MM |
1003 | !(qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR | QIB_S_WAIT_PSN)) && |
1004 | (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) | |
f931551b RC |
1005 | start_timer(qp); |
1006 | ||
1007 | while (qp->s_last != qp->s_acked) { | |
1008 | wqe = get_swqe_ptr(qp, qp->s_last); | |
1009 | if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) >= 0 && | |
1010 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) | |
1011 | break; | |
1012 | for (i = 0; i < wqe->wr.num_sge; i++) { | |
1013 | struct qib_sge *sge = &wqe->sg_list[i]; | |
1014 | ||
6a82649f | 1015 | qib_put_mr(sge->mr); |
f931551b RC |
1016 | } |
1017 | /* Post a send completion queue entry if requested. */ | |
1018 | if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || | |
1019 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { | |
041af0bb | 1020 | memset(&wc, 0, sizeof(wc)); |
f931551b RC |
1021 | wc.wr_id = wqe->wr.wr_id; |
1022 | wc.status = IB_WC_SUCCESS; | |
1023 | wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; | |
1024 | wc.byte_len = wqe->length; | |
1025 | wc.qp = &qp->ibqp; | |
1026 | qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
1027 | } | |
1028 | if (++qp->s_last >= qp->s_size) | |
1029 | qp->s_last = 0; | |
1030 | } | |
1031 | /* | |
1032 | * If we were waiting for sends to complete before resending, | |
1033 | * and they are now complete, restart sending. | |
1034 | */ | |
1035 | if (qp->s_flags & QIB_S_WAIT_PSN && | |
1036 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { | |
1037 | qp->s_flags &= ~QIB_S_WAIT_PSN; | |
1038 | qp->s_sending_psn = qp->s_psn; | |
1039 | qp->s_sending_hpsn = qp->s_psn - 1; | |
1040 | qib_schedule_send(qp); | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | static inline void update_last_psn(struct qib_qp *qp, u32 psn) | |
1045 | { | |
1046 | qp->s_last_psn = psn; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * Generate a SWQE completion. | |
1051 | * This is similar to qib_send_complete but has to check to be sure | |
1052 | * that the SGEs are not being referenced if the SWQE is being resent. | |
1053 | */ | |
1054 | static struct qib_swqe *do_rc_completion(struct qib_qp *qp, | |
1055 | struct qib_swqe *wqe, | |
1056 | struct qib_ibport *ibp) | |
1057 | { | |
1058 | struct ib_wc wc; | |
1059 | unsigned i; | |
1060 | ||
1061 | /* | |
1062 | * Don't decrement refcount and don't generate a | |
1063 | * completion if the SWQE is being resent until the send | |
1064 | * is finished. | |
1065 | */ | |
1066 | if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) < 0 || | |
1067 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { | |
1068 | for (i = 0; i < wqe->wr.num_sge; i++) { | |
1069 | struct qib_sge *sge = &wqe->sg_list[i]; | |
1070 | ||
6a82649f | 1071 | qib_put_mr(sge->mr); |
f931551b RC |
1072 | } |
1073 | /* Post a send completion queue entry if requested. */ | |
1074 | if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || | |
1075 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { | |
041af0bb | 1076 | memset(&wc, 0, sizeof(wc)); |
f931551b RC |
1077 | wc.wr_id = wqe->wr.wr_id; |
1078 | wc.status = IB_WC_SUCCESS; | |
1079 | wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; | |
1080 | wc.byte_len = wqe->length; | |
1081 | wc.qp = &qp->ibqp; | |
1082 | qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
1083 | } | |
1084 | if (++qp->s_last >= qp->s_size) | |
1085 | qp->s_last = 0; | |
1086 | } else | |
1087 | ibp->n_rc_delayed_comp++; | |
1088 | ||
1089 | qp->s_retry = qp->s_retry_cnt; | |
1090 | update_last_psn(qp, wqe->lpsn); | |
1091 | ||
1092 | /* | |
1093 | * If we are completing a request which is in the process of | |
1094 | * being resent, we can stop resending it since we know the | |
1095 | * responder has already seen it. | |
1096 | */ | |
1097 | if (qp->s_acked == qp->s_cur) { | |
1098 | if (++qp->s_cur >= qp->s_size) | |
1099 | qp->s_cur = 0; | |
1100 | qp->s_acked = qp->s_cur; | |
1101 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
1102 | if (qp->s_acked != qp->s_tail) { | |
1103 | qp->s_state = OP(SEND_LAST); | |
1104 | qp->s_psn = wqe->psn; | |
1105 | } | |
1106 | } else { | |
1107 | if (++qp->s_acked >= qp->s_size) | |
1108 | qp->s_acked = 0; | |
1109 | if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur) | |
1110 | qp->s_draining = 0; | |
1111 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1112 | } | |
1113 | return wqe; | |
1114 | } | |
1115 | ||
1116 | /** | |
1117 | * do_rc_ack - process an incoming RC ACK | |
1118 | * @qp: the QP the ACK came in on | |
1119 | * @psn: the packet sequence number of the ACK | |
1120 | * @opcode: the opcode of the request that resulted in the ACK | |
1121 | * | |
1122 | * This is called from qib_rc_rcv_resp() to process an incoming RC ACK | |
1123 | * for the given QP. | |
1124 | * Called at interrupt level with the QP s_lock held. | |
1125 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). | |
1126 | */ | |
1127 | static int do_rc_ack(struct qib_qp *qp, u32 aeth, u32 psn, int opcode, | |
1128 | u64 val, struct qib_ctxtdata *rcd) | |
1129 | { | |
1130 | struct qib_ibport *ibp; | |
1131 | enum ib_wc_status status; | |
1132 | struct qib_swqe *wqe; | |
1133 | int ret = 0; | |
1134 | u32 ack_psn; | |
1135 | int diff; | |
1136 | ||
1137 | /* Remove QP from retry timer */ | |
1138 | if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) { | |
1139 | qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR); | |
1140 | del_timer(&qp->s_timer); | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
1145 | * requests and implicitly NAK RDMA read and atomic requests issued | |
1146 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
1147 | * request but will include an ACK'ed request(s). | |
1148 | */ | |
1149 | ack_psn = psn; | |
1150 | if (aeth >> 29) | |
1151 | ack_psn--; | |
1152 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1153 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
1154 | ||
1155 | /* | |
1156 | * The MSN might be for a later WQE than the PSN indicates so | |
1157 | * only complete WQEs that the PSN finishes. | |
1158 | */ | |
1159 | while ((diff = qib_cmp24(ack_psn, wqe->lpsn)) >= 0) { | |
1160 | /* | |
1161 | * RDMA_READ_RESPONSE_ONLY is a special case since | |
1162 | * we want to generate completion events for everything | |
1163 | * before the RDMA read, copy the data, then generate | |
1164 | * the completion for the read. | |
1165 | */ | |
1166 | if (wqe->wr.opcode == IB_WR_RDMA_READ && | |
1167 | opcode == OP(RDMA_READ_RESPONSE_ONLY) && | |
1168 | diff == 0) { | |
1169 | ret = 1; | |
1170 | goto bail; | |
1171 | } | |
1172 | /* | |
1173 | * If this request is a RDMA read or atomic, and the ACK is | |
1174 | * for a later operation, this ACK NAKs the RDMA read or | |
1175 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
1176 | * can ACK a RDMA read and likewise for atomic ops. Note | |
1177 | * that the NAK case can only happen if relaxed ordering is | |
1178 | * used and requests are sent after an RDMA read or atomic | |
1179 | * is sent but before the response is received. | |
1180 | */ | |
1181 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
1182 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || | |
1183 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1184 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
1185 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { | |
1186 | /* Retry this request. */ | |
1187 | if (!(qp->r_flags & QIB_R_RDMAR_SEQ)) { | |
1188 | qp->r_flags |= QIB_R_RDMAR_SEQ; | |
1189 | qib_restart_rc(qp, qp->s_last_psn + 1, 0); | |
1190 | if (list_empty(&qp->rspwait)) { | |
1191 | qp->r_flags |= QIB_R_RSP_SEND; | |
1192 | atomic_inc(&qp->refcount); | |
1193 | list_add_tail(&qp->rspwait, | |
1194 | &rcd->qp_wait_list); | |
1195 | } | |
1196 | } | |
1197 | /* | |
1198 | * No need to process the ACK/NAK since we are | |
1199 | * restarting an earlier request. | |
1200 | */ | |
1201 | goto bail; | |
1202 | } | |
1203 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1204 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { | |
1205 | u64 *vaddr = wqe->sg_list[0].vaddr; | |
1206 | *vaddr = val; | |
1207 | } | |
1208 | if (qp->s_num_rd_atomic && | |
1209 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1210 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1211 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
1212 | qp->s_num_rd_atomic--; | |
1213 | /* Restart sending task if fence is complete */ | |
1214 | if ((qp->s_flags & QIB_S_WAIT_FENCE) && | |
1215 | !qp->s_num_rd_atomic) { | |
1216 | qp->s_flags &= ~(QIB_S_WAIT_FENCE | | |
1217 | QIB_S_WAIT_ACK); | |
1218 | qib_schedule_send(qp); | |
1219 | } else if (qp->s_flags & QIB_S_WAIT_RDMAR) { | |
1220 | qp->s_flags &= ~(QIB_S_WAIT_RDMAR | | |
1221 | QIB_S_WAIT_ACK); | |
1222 | qib_schedule_send(qp); | |
1223 | } | |
1224 | } | |
1225 | wqe = do_rc_completion(qp, wqe, ibp); | |
1226 | if (qp->s_acked == qp->s_tail) | |
1227 | break; | |
1228 | } | |
1229 | ||
1230 | switch (aeth >> 29) { | |
1231 | case 0: /* ACK */ | |
1232 | ibp->n_rc_acks++; | |
1233 | if (qp->s_acked != qp->s_tail) { | |
1234 | /* | |
1235 | * We are expecting more ACKs so | |
1236 | * reset the retransmit timer. | |
1237 | */ | |
1238 | start_timer(qp); | |
1239 | /* | |
1240 | * We can stop resending the earlier packets and | |
1241 | * continue with the next packet the receiver wants. | |
1242 | */ | |
1243 | if (qib_cmp24(qp->s_psn, psn) <= 0) | |
1244 | reset_psn(qp, psn + 1); | |
1245 | } else if (qib_cmp24(qp->s_psn, psn) <= 0) { | |
1246 | qp->s_state = OP(SEND_LAST); | |
1247 | qp->s_psn = psn + 1; | |
1248 | } | |
1249 | if (qp->s_flags & QIB_S_WAIT_ACK) { | |
1250 | qp->s_flags &= ~QIB_S_WAIT_ACK; | |
1251 | qib_schedule_send(qp); | |
1252 | } | |
1253 | qib_get_credit(qp, aeth); | |
1254 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1255 | qp->s_retry = qp->s_retry_cnt; | |
1256 | update_last_psn(qp, psn); | |
1257 | ret = 1; | |
1258 | goto bail; | |
1259 | ||
1260 | case 1: /* RNR NAK */ | |
1261 | ibp->n_rnr_naks++; | |
1262 | if (qp->s_acked == qp->s_tail) | |
1263 | goto bail; | |
1264 | if (qp->s_flags & QIB_S_WAIT_RNR) | |
1265 | goto bail; | |
1266 | if (qp->s_rnr_retry == 0) { | |
1267 | status = IB_WC_RNR_RETRY_EXC_ERR; | |
1268 | goto class_b; | |
1269 | } | |
1270 | if (qp->s_rnr_retry_cnt < 7) | |
1271 | qp->s_rnr_retry--; | |
1272 | ||
1273 | /* The last valid PSN is the previous PSN. */ | |
1274 | update_last_psn(qp, psn - 1); | |
1275 | ||
1276 | ibp->n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK; | |
1277 | ||
1278 | reset_psn(qp, psn); | |
1279 | ||
1280 | qp->s_flags &= ~(QIB_S_WAIT_SSN_CREDIT | QIB_S_WAIT_ACK); | |
1281 | qp->s_flags |= QIB_S_WAIT_RNR; | |
1282 | qp->s_timer.function = qib_rc_rnr_retry; | |
1283 | qp->s_timer.expires = jiffies + usecs_to_jiffies( | |
1284 | ib_qib_rnr_table[(aeth >> QIB_AETH_CREDIT_SHIFT) & | |
1285 | QIB_AETH_CREDIT_MASK]); | |
1286 | add_timer(&qp->s_timer); | |
1287 | goto bail; | |
1288 | ||
1289 | case 3: /* NAK */ | |
1290 | if (qp->s_acked == qp->s_tail) | |
1291 | goto bail; | |
1292 | /* The last valid PSN is the previous PSN. */ | |
1293 | update_last_psn(qp, psn - 1); | |
1294 | switch ((aeth >> QIB_AETH_CREDIT_SHIFT) & | |
1295 | QIB_AETH_CREDIT_MASK) { | |
1296 | case 0: /* PSN sequence error */ | |
1297 | ibp->n_seq_naks++; | |
1298 | /* | |
1299 | * Back up to the responder's expected PSN. | |
1300 | * Note that we might get a NAK in the middle of an | |
1301 | * RDMA READ response which terminates the RDMA | |
1302 | * READ. | |
1303 | */ | |
1304 | qib_restart_rc(qp, psn, 0); | |
1305 | qib_schedule_send(qp); | |
1306 | break; | |
1307 | ||
1308 | case 1: /* Invalid Request */ | |
1309 | status = IB_WC_REM_INV_REQ_ERR; | |
1310 | ibp->n_other_naks++; | |
1311 | goto class_b; | |
1312 | ||
1313 | case 2: /* Remote Access Error */ | |
1314 | status = IB_WC_REM_ACCESS_ERR; | |
1315 | ibp->n_other_naks++; | |
1316 | goto class_b; | |
1317 | ||
1318 | case 3: /* Remote Operation Error */ | |
1319 | status = IB_WC_REM_OP_ERR; | |
1320 | ibp->n_other_naks++; | |
1321 | class_b: | |
1322 | if (qp->s_last == qp->s_acked) { | |
1323 | qib_send_complete(qp, wqe, status); | |
1324 | qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
1325 | } | |
1326 | break; | |
1327 | ||
1328 | default: | |
1329 | /* Ignore other reserved NAK error codes */ | |
1330 | goto reserved; | |
1331 | } | |
1332 | qp->s_retry = qp->s_retry_cnt; | |
1333 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1334 | goto bail; | |
1335 | ||
1336 | default: /* 2: reserved */ | |
1337 | reserved: | |
1338 | /* Ignore reserved NAK codes. */ | |
1339 | goto bail; | |
1340 | } | |
1341 | ||
1342 | bail: | |
1343 | return ret; | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * We have seen an out of sequence RDMA read middle or last packet. | |
1348 | * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE. | |
1349 | */ | |
1350 | static void rdma_seq_err(struct qib_qp *qp, struct qib_ibport *ibp, u32 psn, | |
1351 | struct qib_ctxtdata *rcd) | |
1352 | { | |
1353 | struct qib_swqe *wqe; | |
1354 | ||
1355 | /* Remove QP from retry timer */ | |
1356 | if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) { | |
1357 | qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR); | |
1358 | del_timer(&qp->s_timer); | |
1359 | } | |
1360 | ||
1361 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1362 | ||
1363 | while (qib_cmp24(psn, wqe->lpsn) > 0) { | |
1364 | if (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1365 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1366 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) | |
1367 | break; | |
1368 | wqe = do_rc_completion(qp, wqe, ibp); | |
1369 | } | |
1370 | ||
1371 | ibp->n_rdma_seq++; | |
1372 | qp->r_flags |= QIB_R_RDMAR_SEQ; | |
1373 | qib_restart_rc(qp, qp->s_last_psn + 1, 0); | |
1374 | if (list_empty(&qp->rspwait)) { | |
1375 | qp->r_flags |= QIB_R_RSP_SEND; | |
1376 | atomic_inc(&qp->refcount); | |
1377 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
1378 | } | |
1379 | } | |
1380 | ||
1381 | /** | |
1382 | * qib_rc_rcv_resp - process an incoming RC response packet | |
1383 | * @ibp: the port this packet came in on | |
1384 | * @ohdr: the other headers for this packet | |
1385 | * @data: the packet data | |
1386 | * @tlen: the packet length | |
1387 | * @qp: the QP for this packet | |
1388 | * @opcode: the opcode for this packet | |
1389 | * @psn: the packet sequence number for this packet | |
1390 | * @hdrsize: the header length | |
1391 | * @pmtu: the path MTU | |
1392 | * | |
1393 | * This is called from qib_rc_rcv() to process an incoming RC response | |
1394 | * packet for the given QP. | |
1395 | * Called at interrupt level. | |
1396 | */ | |
1397 | static void qib_rc_rcv_resp(struct qib_ibport *ibp, | |
1398 | struct qib_other_headers *ohdr, | |
1399 | void *data, u32 tlen, | |
1400 | struct qib_qp *qp, | |
1401 | u32 opcode, | |
1402 | u32 psn, u32 hdrsize, u32 pmtu, | |
1403 | struct qib_ctxtdata *rcd) | |
1404 | { | |
1405 | struct qib_swqe *wqe; | |
dd04e43d | 1406 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); |
f931551b RC |
1407 | enum ib_wc_status status; |
1408 | unsigned long flags; | |
1409 | int diff; | |
1410 | u32 pad; | |
1411 | u32 aeth; | |
1412 | u64 val; | |
1413 | ||
dd04e43d MM |
1414 | if (opcode != OP(RDMA_READ_RESPONSE_MIDDLE)) { |
1415 | /* | |
1416 | * If ACK'd PSN on SDMA busy list try to make progress to | |
1417 | * reclaim SDMA credits. | |
1418 | */ | |
1419 | if ((qib_cmp24(psn, qp->s_sending_psn) >= 0) && | |
1420 | (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) { | |
1421 | ||
1422 | /* | |
1423 | * If send tasklet not running attempt to progress | |
1424 | * SDMA queue. | |
1425 | */ | |
1426 | if (!(qp->s_flags & QIB_S_BUSY)) { | |
1427 | /* Acquire SDMA Lock */ | |
1428 | spin_lock_irqsave(&ppd->sdma_lock, flags); | |
1429 | /* Invoke sdma make progress */ | |
1430 | qib_sdma_make_progress(ppd); | |
1431 | /* Release SDMA Lock */ | |
1432 | spin_unlock_irqrestore(&ppd->sdma_lock, flags); | |
1433 | } | |
1434 | } | |
1435 | } | |
1436 | ||
f931551b | 1437 | spin_lock_irqsave(&qp->s_lock, flags); |
414ed90c MM |
1438 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) |
1439 | goto ack_done; | |
f931551b | 1440 | |
f931551b RC |
1441 | /* Ignore invalid responses. */ |
1442 | if (qib_cmp24(psn, qp->s_next_psn) >= 0) | |
1443 | goto ack_done; | |
1444 | ||
1445 | /* Ignore duplicate responses. */ | |
1446 | diff = qib_cmp24(psn, qp->s_last_psn); | |
1447 | if (unlikely(diff <= 0)) { | |
1448 | /* Update credits for "ghost" ACKs */ | |
1449 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1450 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1451 | if ((aeth >> 29) == 0) | |
1452 | qib_get_credit(qp, aeth); | |
1453 | } | |
1454 | goto ack_done; | |
1455 | } | |
1456 | ||
1457 | /* | |
1458 | * Skip everything other than the PSN we expect, if we are waiting | |
1459 | * for a reply to a restarted RDMA read or atomic op. | |
1460 | */ | |
1461 | if (qp->r_flags & QIB_R_RDMAR_SEQ) { | |
1462 | if (qib_cmp24(psn, qp->s_last_psn + 1) != 0) | |
1463 | goto ack_done; | |
1464 | qp->r_flags &= ~QIB_R_RDMAR_SEQ; | |
1465 | } | |
1466 | ||
1467 | if (unlikely(qp->s_acked == qp->s_tail)) | |
1468 | goto ack_done; | |
1469 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1470 | status = IB_WC_SUCCESS; | |
1471 | ||
1472 | switch (opcode) { | |
1473 | case OP(ACKNOWLEDGE): | |
1474 | case OP(ATOMIC_ACKNOWLEDGE): | |
1475 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1476 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1477 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) { | |
1478 | __be32 *p = ohdr->u.at.atomic_ack_eth; | |
1479 | ||
1480 | val = ((u64) be32_to_cpu(p[0]) << 32) | | |
1481 | be32_to_cpu(p[1]); | |
1482 | } else | |
1483 | val = 0; | |
1484 | if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || | |
1485 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) | |
1486 | goto ack_done; | |
1487 | hdrsize += 4; | |
1488 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1489 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1490 | goto ack_op_err; | |
1491 | /* | |
1492 | * If this is a response to a resent RDMA read, we | |
1493 | * have to be careful to copy the data to the right | |
1494 | * location. | |
1495 | */ | |
1496 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1497 | wqe, psn, pmtu); | |
1498 | goto read_middle; | |
1499 | ||
1500 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1501 | /* no AETH, no ACK */ | |
1502 | if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1))) | |
1503 | goto ack_seq_err; | |
1504 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1505 | goto ack_op_err; | |
1506 | read_middle: | |
1507 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1508 | goto ack_len_err; | |
1509 | if (unlikely(pmtu >= qp->s_rdma_read_len)) | |
1510 | goto ack_len_err; | |
1511 | ||
1512 | /* | |
1513 | * We got a response so update the timeout. | |
1514 | * 4.096 usec. * (1 << qp->timeout) | |
1515 | */ | |
1516 | qp->s_flags |= QIB_S_TIMER; | |
d0f2faf7 | 1517 | mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies); |
f931551b RC |
1518 | if (qp->s_flags & QIB_S_WAIT_ACK) { |
1519 | qp->s_flags &= ~QIB_S_WAIT_ACK; | |
1520 | qib_schedule_send(qp); | |
1521 | } | |
1522 | ||
1523 | if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) | |
1524 | qp->s_retry = qp->s_retry_cnt; | |
1525 | ||
1526 | /* | |
1527 | * Update the RDMA receive state but do the copy w/o | |
1528 | * holding the locks and blocking interrupts. | |
1529 | */ | |
1530 | qp->s_rdma_read_len -= pmtu; | |
1531 | update_last_psn(qp, psn); | |
1532 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1533 | qib_copy_sge(&qp->s_rdma_read_sge, data, pmtu, 0); | |
1534 | goto bail; | |
1535 | ||
1536 | case OP(RDMA_READ_RESPONSE_ONLY): | |
1537 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1538 | if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) | |
1539 | goto ack_done; | |
1540 | /* Get the number of bytes the message was padded by. */ | |
1541 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1542 | /* | |
1543 | * Check that the data size is >= 0 && <= pmtu. | |
1544 | * Remember to account for the AETH header (4) and | |
1545 | * ICRC (4). | |
1546 | */ | |
1547 | if (unlikely(tlen < (hdrsize + pad + 8))) | |
1548 | goto ack_len_err; | |
1549 | /* | |
1550 | * If this is a response to a resent RDMA read, we | |
1551 | * have to be careful to copy the data to the right | |
1552 | * location. | |
1553 | */ | |
1554 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1555 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1556 | wqe, psn, pmtu); | |
1557 | goto read_last; | |
1558 | ||
1559 | case OP(RDMA_READ_RESPONSE_LAST): | |
1560 | /* ACKs READ req. */ | |
1561 | if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1))) | |
1562 | goto ack_seq_err; | |
1563 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1564 | goto ack_op_err; | |
1565 | /* Get the number of bytes the message was padded by. */ | |
1566 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1567 | /* | |
1568 | * Check that the data size is >= 1 && <= pmtu. | |
1569 | * Remember to account for the AETH header (4) and | |
1570 | * ICRC (4). | |
1571 | */ | |
1572 | if (unlikely(tlen <= (hdrsize + pad + 8))) | |
1573 | goto ack_len_err; | |
1574 | read_last: | |
1575 | tlen -= hdrsize + pad + 8; | |
1576 | if (unlikely(tlen != qp->s_rdma_read_len)) | |
1577 | goto ack_len_err; | |
1578 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1579 | qib_copy_sge(&qp->s_rdma_read_sge, data, tlen, 0); | |
1580 | WARN_ON(qp->s_rdma_read_sge.num_sge); | |
1581 | (void) do_rc_ack(qp, aeth, psn, | |
1582 | OP(RDMA_READ_RESPONSE_LAST), 0, rcd); | |
1583 | goto ack_done; | |
1584 | } | |
1585 | ||
1586 | ack_op_err: | |
1587 | status = IB_WC_LOC_QP_OP_ERR; | |
1588 | goto ack_err; | |
1589 | ||
1590 | ack_seq_err: | |
1591 | rdma_seq_err(qp, ibp, psn, rcd); | |
1592 | goto ack_done; | |
1593 | ||
1594 | ack_len_err: | |
1595 | status = IB_WC_LOC_LEN_ERR; | |
1596 | ack_err: | |
1597 | if (qp->s_last == qp->s_acked) { | |
1598 | qib_send_complete(qp, wqe, status); | |
1599 | qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
1600 | } | |
1601 | ack_done: | |
1602 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1603 | bail: | |
1604 | return; | |
1605 | } | |
1606 | ||
1607 | /** | |
1608 | * qib_rc_rcv_error - process an incoming duplicate or error RC packet | |
1609 | * @ohdr: the other headers for this packet | |
1610 | * @data: the packet data | |
1611 | * @qp: the QP for this packet | |
1612 | * @opcode: the opcode for this packet | |
1613 | * @psn: the packet sequence number for this packet | |
1614 | * @diff: the difference between the PSN and the expected PSN | |
1615 | * | |
1616 | * This is called from qib_rc_rcv() to process an unexpected | |
1617 | * incoming RC packet for the given QP. | |
1618 | * Called at interrupt level. | |
1619 | * Return 1 if no more processing is needed; otherwise return 0 to | |
1620 | * schedule a response to be sent. | |
1621 | */ | |
1622 | static int qib_rc_rcv_error(struct qib_other_headers *ohdr, | |
1623 | void *data, | |
1624 | struct qib_qp *qp, | |
1625 | u32 opcode, | |
1626 | u32 psn, | |
1627 | int diff, | |
1628 | struct qib_ctxtdata *rcd) | |
1629 | { | |
1630 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
1631 | struct qib_ack_entry *e; | |
1632 | unsigned long flags; | |
1633 | u8 i, prev; | |
1634 | int old_req; | |
1635 | ||
1636 | if (diff > 0) { | |
1637 | /* | |
1638 | * Packet sequence error. | |
1639 | * A NAK will ACK earlier sends and RDMA writes. | |
1640 | * Don't queue the NAK if we already sent one. | |
1641 | */ | |
1642 | if (!qp->r_nak_state) { | |
1643 | ibp->n_rc_seqnak++; | |
1644 | qp->r_nak_state = IB_NAK_PSN_ERROR; | |
1645 | /* Use the expected PSN. */ | |
1646 | qp->r_ack_psn = qp->r_psn; | |
1647 | /* | |
1648 | * Wait to send the sequence NAK until all packets | |
1649 | * in the receive queue have been processed. | |
1650 | * Otherwise, we end up propagating congestion. | |
1651 | */ | |
1652 | if (list_empty(&qp->rspwait)) { | |
1653 | qp->r_flags |= QIB_R_RSP_NAK; | |
1654 | atomic_inc(&qp->refcount); | |
1655 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
1656 | } | |
1657 | } | |
1658 | goto done; | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1663 | * write or atomic op. Don't NAK errors, just silently drop | |
1664 | * the duplicate request. Note that r_sge, r_len, and | |
1665 | * r_rcv_len may be in use so don't modify them. | |
1666 | * | |
1667 | * We are supposed to ACK the earliest duplicate PSN but we | |
1668 | * can coalesce an outstanding duplicate ACK. We have to | |
1669 | * send the earliest so that RDMA reads can be restarted at | |
1670 | * the requester's expected PSN. | |
1671 | * | |
1672 | * First, find where this duplicate PSN falls within the | |
1673 | * ACKs previously sent. | |
1674 | * old_req is true if there is an older response that is scheduled | |
1675 | * to be sent before sending this one. | |
1676 | */ | |
1677 | e = NULL; | |
1678 | old_req = 1; | |
1679 | ibp->n_rc_dupreq++; | |
1680 | ||
1681 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
1682 | |
1683 | for (i = qp->r_head_ack_queue; ; i = prev) { | |
1684 | if (i == qp->s_tail_ack_queue) | |
1685 | old_req = 0; | |
1686 | if (i) | |
1687 | prev = i - 1; | |
1688 | else | |
1689 | prev = QIB_MAX_RDMA_ATOMIC; | |
1690 | if (prev == qp->r_head_ack_queue) { | |
1691 | e = NULL; | |
1692 | break; | |
1693 | } | |
1694 | e = &qp->s_ack_queue[prev]; | |
1695 | if (!e->opcode) { | |
1696 | e = NULL; | |
1697 | break; | |
1698 | } | |
1699 | if (qib_cmp24(psn, e->psn) >= 0) { | |
1700 | if (prev == qp->s_tail_ack_queue && | |
1701 | qib_cmp24(psn, e->lpsn) <= 0) | |
1702 | old_req = 0; | |
1703 | break; | |
1704 | } | |
1705 | } | |
1706 | switch (opcode) { | |
1707 | case OP(RDMA_READ_REQUEST): { | |
1708 | struct ib_reth *reth; | |
1709 | u32 offset; | |
1710 | u32 len; | |
1711 | ||
1712 | /* | |
1713 | * If we didn't find the RDMA read request in the ack queue, | |
1714 | * we can ignore this request. | |
1715 | */ | |
1716 | if (!e || e->opcode != OP(RDMA_READ_REQUEST)) | |
1717 | goto unlock_done; | |
1718 | /* RETH comes after BTH */ | |
1719 | reth = &ohdr->u.rc.reth; | |
1720 | /* | |
1721 | * Address range must be a subset of the original | |
1722 | * request and start on pmtu boundaries. | |
1723 | * We reuse the old ack_queue slot since the requester | |
1724 | * should not back up and request an earlier PSN for the | |
1725 | * same request. | |
1726 | */ | |
1727 | offset = ((psn - e->psn) & QIB_PSN_MASK) * | |
cc6ea138 | 1728 | qp->pmtu; |
f931551b RC |
1729 | len = be32_to_cpu(reth->length); |
1730 | if (unlikely(offset + len != e->rdma_sge.sge_length)) | |
1731 | goto unlock_done; | |
1732 | if (e->rdma_sge.mr) { | |
6a82649f | 1733 | qib_put_mr(e->rdma_sge.mr); |
f931551b RC |
1734 | e->rdma_sge.mr = NULL; |
1735 | } | |
1736 | if (len != 0) { | |
1737 | u32 rkey = be32_to_cpu(reth->rkey); | |
1738 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1739 | int ok; | |
1740 | ||
1741 | ok = qib_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, | |
1742 | IB_ACCESS_REMOTE_READ); | |
1743 | if (unlikely(!ok)) | |
1744 | goto unlock_done; | |
1745 | } else { | |
1746 | e->rdma_sge.vaddr = NULL; | |
1747 | e->rdma_sge.length = 0; | |
1748 | e->rdma_sge.sge_length = 0; | |
1749 | } | |
1750 | e->psn = psn; | |
1751 | if (old_req) | |
1752 | goto unlock_done; | |
1753 | qp->s_tail_ack_queue = prev; | |
1754 | break; | |
1755 | } | |
1756 | ||
1757 | case OP(COMPARE_SWAP): | |
1758 | case OP(FETCH_ADD): { | |
1759 | /* | |
1760 | * If we didn't find the atomic request in the ack queue | |
1761 | * or the send tasklet is already backed up to send an | |
1762 | * earlier entry, we can ignore this request. | |
1763 | */ | |
1764 | if (!e || e->opcode != (u8) opcode || old_req) | |
1765 | goto unlock_done; | |
1766 | qp->s_tail_ack_queue = prev; | |
1767 | break; | |
1768 | } | |
1769 | ||
1770 | default: | |
1771 | /* | |
1772 | * Ignore this operation if it doesn't request an ACK | |
1773 | * or an earlier RDMA read or atomic is going to be resent. | |
1774 | */ | |
1775 | if (!(psn & IB_BTH_REQ_ACK) || old_req) | |
1776 | goto unlock_done; | |
1777 | /* | |
1778 | * Resend the most recent ACK if this request is | |
1779 | * after all the previous RDMA reads and atomics. | |
1780 | */ | |
1781 | if (i == qp->r_head_ack_queue) { | |
1782 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1783 | qp->r_nak_state = 0; | |
1784 | qp->r_ack_psn = qp->r_psn - 1; | |
1785 | goto send_ack; | |
1786 | } | |
1787 | /* | |
1788 | * Try to send a simple ACK to work around a Mellanox bug | |
1789 | * which doesn't accept a RDMA read response or atomic | |
1790 | * response as an ACK for earlier SENDs or RDMA writes. | |
1791 | */ | |
1792 | if (!(qp->s_flags & QIB_S_RESP_PENDING)) { | |
1793 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1794 | qp->r_nak_state = 0; | |
1795 | qp->r_ack_psn = qp->s_ack_queue[i].psn - 1; | |
1796 | goto send_ack; | |
1797 | } | |
1798 | /* | |
1799 | * Resend the RDMA read or atomic op which | |
1800 | * ACKs this duplicate request. | |
1801 | */ | |
1802 | qp->s_tail_ack_queue = i; | |
1803 | break; | |
1804 | } | |
1805 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1806 | qp->s_flags |= QIB_S_RESP_PENDING; | |
1807 | qp->r_nak_state = 0; | |
1808 | qib_schedule_send(qp); | |
1809 | ||
1810 | unlock_done: | |
1811 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1812 | done: | |
1813 | return 1; | |
1814 | ||
1815 | send_ack: | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | void qib_rc_error(struct qib_qp *qp, enum ib_wc_status err) | |
1820 | { | |
1821 | unsigned long flags; | |
1822 | int lastwqe; | |
1823 | ||
1824 | spin_lock_irqsave(&qp->s_lock, flags); | |
1825 | lastwqe = qib_error_qp(qp, err); | |
1826 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1827 | ||
1828 | if (lastwqe) { | |
1829 | struct ib_event ev; | |
1830 | ||
1831 | ev.device = qp->ibqp.device; | |
1832 | ev.element.qp = &qp->ibqp; | |
1833 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
1834 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | static inline void qib_update_ack_queue(struct qib_qp *qp, unsigned n) | |
1839 | { | |
1840 | unsigned next; | |
1841 | ||
1842 | next = n + 1; | |
1843 | if (next > QIB_MAX_RDMA_ATOMIC) | |
1844 | next = 0; | |
1845 | qp->s_tail_ack_queue = next; | |
1846 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1847 | } | |
1848 | ||
1849 | /** | |
1850 | * qib_rc_rcv - process an incoming RC packet | |
1851 | * @rcd: the context pointer | |
1852 | * @hdr: the header of this packet | |
1853 | * @has_grh: true if the header has a GRH | |
1854 | * @data: the packet data | |
1855 | * @tlen: the packet length | |
1856 | * @qp: the QP for this packet | |
1857 | * | |
1858 | * This is called from qib_qp_rcv() to process an incoming RC packet | |
1859 | * for the given QP. | |
1860 | * Called at interrupt level. | |
1861 | */ | |
1862 | void qib_rc_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr, | |
1863 | int has_grh, void *data, u32 tlen, struct qib_qp *qp) | |
1864 | { | |
1865 | struct qib_ibport *ibp = &rcd->ppd->ibport_data; | |
1866 | struct qib_other_headers *ohdr; | |
1867 | u32 opcode; | |
1868 | u32 hdrsize; | |
1869 | u32 psn; | |
1870 | u32 pad; | |
1871 | struct ib_wc wc; | |
cc6ea138 | 1872 | u32 pmtu = qp->pmtu; |
f931551b RC |
1873 | int diff; |
1874 | struct ib_reth *reth; | |
1875 | unsigned long flags; | |
1876 | int ret; | |
1877 | ||
1878 | /* Check for GRH */ | |
1879 | if (!has_grh) { | |
1880 | ohdr = &hdr->u.oth; | |
1881 | hdrsize = 8 + 12; /* LRH + BTH */ | |
1882 | } else { | |
1883 | ohdr = &hdr->u.l.oth; | |
1884 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
1885 | } | |
1886 | ||
1887 | opcode = be32_to_cpu(ohdr->bth[0]); | |
f931551b | 1888 | if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode)) |
9fd5473d | 1889 | return; |
f931551b RC |
1890 | |
1891 | psn = be32_to_cpu(ohdr->bth[2]); | |
1892 | opcode >>= 24; | |
1893 | ||
f931551b RC |
1894 | /* |
1895 | * Process responses (ACKs) before anything else. Note that the | |
1896 | * packet sequence number will be for something in the send work | |
1897 | * queue rather than the expected receive packet sequence number. | |
1898 | * In other words, this QP is the requester. | |
1899 | */ | |
1900 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
1901 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1902 | qib_rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn, | |
1903 | hdrsize, pmtu, rcd); | |
a5210c12 | 1904 | return; |
f931551b RC |
1905 | } |
1906 | ||
1907 | /* Compute 24 bits worth of difference. */ | |
1908 | diff = qib_cmp24(psn, qp->r_psn); | |
1909 | if (unlikely(diff)) { | |
1910 | if (qib_rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) | |
a5210c12 | 1911 | return; |
f931551b RC |
1912 | goto send_ack; |
1913 | } | |
1914 | ||
1915 | /* Check for opcode sequence errors. */ | |
1916 | switch (qp->r_state) { | |
1917 | case OP(SEND_FIRST): | |
1918 | case OP(SEND_MIDDLE): | |
1919 | if (opcode == OP(SEND_MIDDLE) || | |
1920 | opcode == OP(SEND_LAST) || | |
1921 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
1922 | break; | |
1923 | goto nack_inv; | |
1924 | ||
1925 | case OP(RDMA_WRITE_FIRST): | |
1926 | case OP(RDMA_WRITE_MIDDLE): | |
1927 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
1928 | opcode == OP(RDMA_WRITE_LAST) || | |
1929 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1930 | break; | |
1931 | goto nack_inv; | |
1932 | ||
1933 | default: | |
1934 | if (opcode == OP(SEND_MIDDLE) || | |
1935 | opcode == OP(SEND_LAST) || | |
1936 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
1937 | opcode == OP(RDMA_WRITE_MIDDLE) || | |
1938 | opcode == OP(RDMA_WRITE_LAST) || | |
1939 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1940 | goto nack_inv; | |
1941 | /* | |
1942 | * Note that it is up to the requester to not send a new | |
1943 | * RDMA read or atomic operation before receiving an ACK | |
1944 | * for the previous operation. | |
1945 | */ | |
1946 | break; | |
1947 | } | |
1948 | ||
f931551b RC |
1949 | if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) { |
1950 | qp->r_flags |= QIB_R_COMM_EST; | |
1951 | if (qp->ibqp.event_handler) { | |
1952 | struct ib_event ev; | |
1953 | ||
1954 | ev.device = qp->ibqp.device; | |
1955 | ev.element.qp = &qp->ibqp; | |
1956 | ev.event = IB_EVENT_COMM_EST; | |
1957 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | /* OK, process the packet. */ | |
1962 | switch (opcode) { | |
1963 | case OP(SEND_FIRST): | |
1964 | ret = qib_get_rwqe(qp, 0); | |
1965 | if (ret < 0) | |
1966 | goto nack_op_err; | |
1967 | if (!ret) | |
1968 | goto rnr_nak; | |
1969 | qp->r_rcv_len = 0; | |
1970 | /* FALLTHROUGH */ | |
1971 | case OP(SEND_MIDDLE): | |
1972 | case OP(RDMA_WRITE_MIDDLE): | |
1973 | send_middle: | |
1974 | /* Check for invalid length PMTU or posted rwqe len. */ | |
1975 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1976 | goto nack_inv; | |
1977 | qp->r_rcv_len += pmtu; | |
1978 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
1979 | goto nack_inv; | |
1980 | qib_copy_sge(&qp->r_sge, data, pmtu, 1); | |
1981 | break; | |
1982 | ||
1983 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
1984 | /* consume RWQE */ | |
1985 | ret = qib_get_rwqe(qp, 1); | |
1986 | if (ret < 0) | |
1987 | goto nack_op_err; | |
1988 | if (!ret) | |
1989 | goto rnr_nak; | |
1990 | goto send_last_imm; | |
1991 | ||
1992 | case OP(SEND_ONLY): | |
1993 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
1994 | ret = qib_get_rwqe(qp, 0); | |
1995 | if (ret < 0) | |
1996 | goto nack_op_err; | |
1997 | if (!ret) | |
1998 | goto rnr_nak; | |
1999 | qp->r_rcv_len = 0; | |
2000 | if (opcode == OP(SEND_ONLY)) | |
2fc109c8 MM |
2001 | goto no_immediate_data; |
2002 | /* FALLTHROUGH for SEND_ONLY_WITH_IMMEDIATE */ | |
f931551b RC |
2003 | case OP(SEND_LAST_WITH_IMMEDIATE): |
2004 | send_last_imm: | |
2005 | wc.ex.imm_data = ohdr->u.imm_data; | |
2006 | hdrsize += 4; | |
2007 | wc.wc_flags = IB_WC_WITH_IMM; | |
2fc109c8 | 2008 | goto send_last; |
f931551b RC |
2009 | case OP(SEND_LAST): |
2010 | case OP(RDMA_WRITE_LAST): | |
2fc109c8 MM |
2011 | no_immediate_data: |
2012 | wc.wc_flags = 0; | |
2013 | wc.ex.imm_data = 0; | |
f931551b RC |
2014 | send_last: |
2015 | /* Get the number of bytes the message was padded by. */ | |
2016 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
2017 | /* Check for invalid length. */ | |
2018 | /* XXX LAST len should be >= 1 */ | |
2019 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
2020 | goto nack_inv; | |
2021 | /* Don't count the CRC. */ | |
2022 | tlen -= (hdrsize + pad + 4); | |
2023 | wc.byte_len = tlen + qp->r_rcv_len; | |
2024 | if (unlikely(wc.byte_len > qp->r_len)) | |
2025 | goto nack_inv; | |
2026 | qib_copy_sge(&qp->r_sge, data, tlen, 1); | |
6a82649f | 2027 | qib_put_ss(&qp->r_sge); |
f931551b RC |
2028 | qp->r_msn++; |
2029 | if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) | |
2030 | break; | |
2031 | wc.wr_id = qp->r_wr_id; | |
2032 | wc.status = IB_WC_SUCCESS; | |
2033 | if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || | |
2034 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) | |
2035 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
2036 | else | |
2037 | wc.opcode = IB_WC_RECV; | |
2038 | wc.qp = &qp->ibqp; | |
2039 | wc.src_qp = qp->remote_qpn; | |
2040 | wc.slid = qp->remote_ah_attr.dlid; | |
2041 | wc.sl = qp->remote_ah_attr.sl; | |
2fc109c8 MM |
2042 | /* zero fields that are N/A */ |
2043 | wc.vendor_err = 0; | |
2044 | wc.pkey_index = 0; | |
2045 | wc.dlid_path_bits = 0; | |
2046 | wc.port_num = 0; | |
f931551b RC |
2047 | /* Signal completion event if the solicited bit is set. */ |
2048 | qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
2049 | (ohdr->bth[0] & | |
2050 | cpu_to_be32(IB_BTH_SOLICITED)) != 0); | |
2051 | break; | |
2052 | ||
2053 | case OP(RDMA_WRITE_FIRST): | |
2054 | case OP(RDMA_WRITE_ONLY): | |
2055 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
2056 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
2057 | goto nack_inv; | |
2058 | /* consume RWQE */ | |
2059 | reth = &ohdr->u.rc.reth; | |
2060 | hdrsize += sizeof(*reth); | |
2061 | qp->r_len = be32_to_cpu(reth->length); | |
2062 | qp->r_rcv_len = 0; | |
2063 | qp->r_sge.sg_list = NULL; | |
2064 | if (qp->r_len != 0) { | |
2065 | u32 rkey = be32_to_cpu(reth->rkey); | |
2066 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
2067 | int ok; | |
2068 | ||
2069 | /* Check rkey & NAK */ | |
2070 | ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, | |
2071 | rkey, IB_ACCESS_REMOTE_WRITE); | |
2072 | if (unlikely(!ok)) | |
2073 | goto nack_acc; | |
2074 | qp->r_sge.num_sge = 1; | |
2075 | } else { | |
2076 | qp->r_sge.num_sge = 0; | |
2077 | qp->r_sge.sge.mr = NULL; | |
2078 | qp->r_sge.sge.vaddr = NULL; | |
2079 | qp->r_sge.sge.length = 0; | |
2080 | qp->r_sge.sge.sge_length = 0; | |
2081 | } | |
2082 | if (opcode == OP(RDMA_WRITE_FIRST)) | |
2083 | goto send_middle; | |
2084 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
2fc109c8 | 2085 | goto no_immediate_data; |
f931551b RC |
2086 | ret = qib_get_rwqe(qp, 1); |
2087 | if (ret < 0) | |
2088 | goto nack_op_err; | |
2089 | if (!ret) | |
2090 | goto rnr_nak; | |
5715f5d4 JG |
2091 | wc.ex.imm_data = ohdr->u.rc.imm_data; |
2092 | hdrsize += 4; | |
2093 | wc.wc_flags = IB_WC_WITH_IMM; | |
2094 | goto send_last; | |
f931551b RC |
2095 | |
2096 | case OP(RDMA_READ_REQUEST): { | |
2097 | struct qib_ack_entry *e; | |
2098 | u32 len; | |
2099 | u8 next; | |
2100 | ||
2101 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
2102 | goto nack_inv; | |
2103 | next = qp->r_head_ack_queue + 1; | |
2104 | /* s_ack_queue is size QIB_MAX_RDMA_ATOMIC+1 so use > not >= */ | |
2105 | if (next > QIB_MAX_RDMA_ATOMIC) | |
2106 | next = 0; | |
2107 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
2108 | if (unlikely(next == qp->s_tail_ack_queue)) { |
2109 | if (!qp->s_ack_queue[next].sent) | |
2110 | goto nack_inv_unlck; | |
2111 | qib_update_ack_queue(qp, next); | |
2112 | } | |
2113 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2114 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
6a82649f | 2115 | qib_put_mr(e->rdma_sge.mr); |
f931551b RC |
2116 | e->rdma_sge.mr = NULL; |
2117 | } | |
2118 | reth = &ohdr->u.rc.reth; | |
2119 | len = be32_to_cpu(reth->length); | |
2120 | if (len) { | |
2121 | u32 rkey = be32_to_cpu(reth->rkey); | |
2122 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
2123 | int ok; | |
2124 | ||
2125 | /* Check rkey & NAK */ | |
2126 | ok = qib_rkey_ok(qp, &e->rdma_sge, len, vaddr, | |
2127 | rkey, IB_ACCESS_REMOTE_READ); | |
2128 | if (unlikely(!ok)) | |
2129 | goto nack_acc_unlck; | |
2130 | /* | |
2131 | * Update the next expected PSN. We add 1 later | |
2132 | * below, so only add the remainder here. | |
2133 | */ | |
2134 | if (len > pmtu) | |
2135 | qp->r_psn += (len - 1) / pmtu; | |
2136 | } else { | |
2137 | e->rdma_sge.mr = NULL; | |
2138 | e->rdma_sge.vaddr = NULL; | |
2139 | e->rdma_sge.length = 0; | |
2140 | e->rdma_sge.sge_length = 0; | |
2141 | } | |
2142 | e->opcode = opcode; | |
2143 | e->sent = 0; | |
2144 | e->psn = psn; | |
2145 | e->lpsn = qp->r_psn; | |
2146 | /* | |
2147 | * We need to increment the MSN here instead of when we | |
2148 | * finish sending the result since a duplicate request would | |
2149 | * increment it more than once. | |
2150 | */ | |
2151 | qp->r_msn++; | |
2152 | qp->r_psn++; | |
2153 | qp->r_state = opcode; | |
2154 | qp->r_nak_state = 0; | |
2155 | qp->r_head_ack_queue = next; | |
2156 | ||
2157 | /* Schedule the send tasklet. */ | |
2158 | qp->s_flags |= QIB_S_RESP_PENDING; | |
2159 | qib_schedule_send(qp); | |
2160 | ||
a5210c12 | 2161 | goto sunlock; |
f931551b RC |
2162 | } |
2163 | ||
2164 | case OP(COMPARE_SWAP): | |
2165 | case OP(FETCH_ADD): { | |
2166 | struct ib_atomic_eth *ateth; | |
2167 | struct qib_ack_entry *e; | |
2168 | u64 vaddr; | |
2169 | atomic64_t *maddr; | |
2170 | u64 sdata; | |
2171 | u32 rkey; | |
2172 | u8 next; | |
2173 | ||
2174 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) | |
2175 | goto nack_inv; | |
2176 | next = qp->r_head_ack_queue + 1; | |
2177 | if (next > QIB_MAX_RDMA_ATOMIC) | |
2178 | next = 0; | |
2179 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
2180 | if (unlikely(next == qp->s_tail_ack_queue)) { |
2181 | if (!qp->s_ack_queue[next].sent) | |
2182 | goto nack_inv_unlck; | |
2183 | qib_update_ack_queue(qp, next); | |
2184 | } | |
2185 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2186 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
6a82649f | 2187 | qib_put_mr(e->rdma_sge.mr); |
f931551b RC |
2188 | e->rdma_sge.mr = NULL; |
2189 | } | |
2190 | ateth = &ohdr->u.atomic_eth; | |
2191 | vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) | | |
2192 | be32_to_cpu(ateth->vaddr[1]); | |
2193 | if (unlikely(vaddr & (sizeof(u64) - 1))) | |
2194 | goto nack_inv_unlck; | |
2195 | rkey = be32_to_cpu(ateth->rkey); | |
2196 | /* Check rkey & NAK */ | |
2197 | if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), | |
2198 | vaddr, rkey, | |
2199 | IB_ACCESS_REMOTE_ATOMIC))) | |
2200 | goto nack_acc_unlck; | |
2201 | /* Perform atomic OP and save result. */ | |
2202 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; | |
2203 | sdata = be64_to_cpu(ateth->swap_data); | |
2204 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? | |
2205 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
2206 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
2207 | be64_to_cpu(ateth->compare_data), | |
2208 | sdata); | |
6a82649f | 2209 | qib_put_mr(qp->r_sge.sge.mr); |
f931551b RC |
2210 | qp->r_sge.num_sge = 0; |
2211 | e->opcode = opcode; | |
2212 | e->sent = 0; | |
2213 | e->psn = psn; | |
2214 | e->lpsn = psn; | |
2215 | qp->r_msn++; | |
2216 | qp->r_psn++; | |
2217 | qp->r_state = opcode; | |
2218 | qp->r_nak_state = 0; | |
2219 | qp->r_head_ack_queue = next; | |
2220 | ||
2221 | /* Schedule the send tasklet. */ | |
2222 | qp->s_flags |= QIB_S_RESP_PENDING; | |
2223 | qib_schedule_send(qp); | |
2224 | ||
a5210c12 | 2225 | goto sunlock; |
f931551b RC |
2226 | } |
2227 | ||
2228 | default: | |
2229 | /* NAK unknown opcodes. */ | |
2230 | goto nack_inv; | |
2231 | } | |
2232 | qp->r_psn++; | |
2233 | qp->r_state = opcode; | |
2234 | qp->r_ack_psn = psn; | |
2235 | qp->r_nak_state = 0; | |
2236 | /* Send an ACK if requested or required. */ | |
2237 | if (psn & (1 << 31)) | |
2238 | goto send_ack; | |
a5210c12 | 2239 | return; |
f931551b RC |
2240 | |
2241 | rnr_nak: | |
2242 | qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; | |
2243 | qp->r_ack_psn = qp->r_psn; | |
2244 | /* Queue RNR NAK for later */ | |
2245 | if (list_empty(&qp->rspwait)) { | |
2246 | qp->r_flags |= QIB_R_RSP_NAK; | |
2247 | atomic_inc(&qp->refcount); | |
2248 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
2249 | } | |
a5210c12 | 2250 | return; |
f931551b RC |
2251 | |
2252 | nack_op_err: | |
2253 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
2254 | qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; | |
2255 | qp->r_ack_psn = qp->r_psn; | |
2256 | /* Queue NAK for later */ | |
2257 | if (list_empty(&qp->rspwait)) { | |
2258 | qp->r_flags |= QIB_R_RSP_NAK; | |
2259 | atomic_inc(&qp->refcount); | |
2260 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
2261 | } | |
a5210c12 | 2262 | return; |
f931551b RC |
2263 | |
2264 | nack_inv_unlck: | |
2265 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2266 | nack_inv: | |
2267 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
2268 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; | |
2269 | qp->r_ack_psn = qp->r_psn; | |
2270 | /* Queue NAK for later */ | |
2271 | if (list_empty(&qp->rspwait)) { | |
2272 | qp->r_flags |= QIB_R_RSP_NAK; | |
2273 | atomic_inc(&qp->refcount); | |
2274 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
2275 | } | |
a5210c12 | 2276 | return; |
f931551b RC |
2277 | |
2278 | nack_acc_unlck: | |
2279 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2280 | nack_acc: | |
2281 | qib_rc_error(qp, IB_WC_LOC_PROT_ERR); | |
2282 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; | |
2283 | qp->r_ack_psn = qp->r_psn; | |
2284 | send_ack: | |
2285 | qib_send_rc_ack(qp); | |
f931551b RC |
2286 | return; |
2287 | ||
2288 | sunlock: | |
2289 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2290 | } |