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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) */ | |
62 | qp->s_timer.expires = jiffies + | |
63 | usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / 1000UL); | |
64 | add_timer(&qp->s_timer); | |
65 | } | |
66 | ||
67 | /** | |
68 | * qib_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) | |
69 | * @dev: the device for this QP | |
70 | * @qp: a pointer to the QP | |
71 | * @ohdr: a pointer to the IB header being constructed | |
72 | * @pmtu: the path MTU | |
73 | * | |
74 | * Return 1 if constructed; otherwise, return 0. | |
75 | * Note that we are in the responder's side of the QP context. | |
76 | * Note the QP s_lock must be held. | |
77 | */ | |
78 | static int qib_make_rc_ack(struct qib_ibdev *dev, struct qib_qp *qp, | |
79 | struct qib_other_headers *ohdr, u32 pmtu) | |
80 | { | |
81 | struct qib_ack_entry *e; | |
82 | u32 hwords; | |
83 | u32 len; | |
84 | u32 bth0; | |
85 | u32 bth2; | |
86 | ||
87 | /* Don't send an ACK if we aren't supposed to. */ | |
88 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) | |
89 | goto bail; | |
90 | ||
91 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
92 | hwords = 5; | |
93 | ||
94 | switch (qp->s_ack_state) { | |
95 | case OP(RDMA_READ_RESPONSE_LAST): | |
96 | case OP(RDMA_READ_RESPONSE_ONLY): | |
97 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
98 | if (e->rdma_sge.mr) { | |
99 | atomic_dec(&e->rdma_sge.mr->refcount); | |
100 | e->rdma_sge.mr = NULL; | |
101 | } | |
102 | /* FALLTHROUGH */ | |
103 | case OP(ATOMIC_ACKNOWLEDGE): | |
104 | /* | |
105 | * We can increment the tail pointer now that the last | |
106 | * response has been sent instead of only being | |
107 | * constructed. | |
108 | */ | |
109 | if (++qp->s_tail_ack_queue > QIB_MAX_RDMA_ATOMIC) | |
110 | qp->s_tail_ack_queue = 0; | |
111 | /* FALLTHROUGH */ | |
112 | case OP(SEND_ONLY): | |
113 | case OP(ACKNOWLEDGE): | |
114 | /* Check for no next entry in the queue. */ | |
115 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { | |
116 | if (qp->s_flags & QIB_S_ACK_PENDING) | |
117 | goto normal; | |
118 | goto bail; | |
119 | } | |
120 | ||
121 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
122 | if (e->opcode == OP(RDMA_READ_REQUEST)) { | |
123 | /* | |
124 | * If a RDMA read response is being resent and | |
125 | * we haven't seen the duplicate request yet, | |
126 | * then stop sending the remaining responses the | |
127 | * responder has seen until the requester resends it. | |
128 | */ | |
129 | len = e->rdma_sge.sge_length; | |
130 | if (len && !e->rdma_sge.mr) { | |
131 | qp->s_tail_ack_queue = qp->r_head_ack_queue; | |
132 | goto bail; | |
133 | } | |
134 | /* Copy SGE state in case we need to resend */ | |
135 | qp->s_rdma_mr = e->rdma_sge.mr; | |
136 | if (qp->s_rdma_mr) | |
137 | atomic_inc(&qp->s_rdma_mr->refcount); | |
138 | qp->s_ack_rdma_sge.sge = e->rdma_sge; | |
139 | qp->s_ack_rdma_sge.num_sge = 1; | |
140 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
141 | if (len > pmtu) { | |
142 | len = pmtu; | |
143 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); | |
144 | } else { | |
145 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); | |
146 | e->sent = 1; | |
147 | } | |
148 | ohdr->u.aeth = qib_compute_aeth(qp); | |
149 | hwords++; | |
150 | qp->s_ack_rdma_psn = e->psn; | |
151 | bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK; | |
152 | } else { | |
153 | /* COMPARE_SWAP or FETCH_ADD */ | |
154 | qp->s_cur_sge = NULL; | |
155 | len = 0; | |
156 | qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); | |
157 | ohdr->u.at.aeth = qib_compute_aeth(qp); | |
158 | ohdr->u.at.atomic_ack_eth[0] = | |
159 | cpu_to_be32(e->atomic_data >> 32); | |
160 | ohdr->u.at.atomic_ack_eth[1] = | |
161 | cpu_to_be32(e->atomic_data); | |
162 | hwords += sizeof(ohdr->u.at) / sizeof(u32); | |
163 | bth2 = e->psn & QIB_PSN_MASK; | |
164 | e->sent = 1; | |
165 | } | |
166 | bth0 = qp->s_ack_state << 24; | |
167 | break; | |
168 | ||
169 | case OP(RDMA_READ_RESPONSE_FIRST): | |
170 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
171 | /* FALLTHROUGH */ | |
172 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
173 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
174 | qp->s_rdma_mr = qp->s_ack_rdma_sge.sge.mr; | |
175 | if (qp->s_rdma_mr) | |
176 | atomic_inc(&qp->s_rdma_mr->refcount); | |
177 | len = qp->s_ack_rdma_sge.sge.sge_length; | |
178 | if (len > pmtu) | |
179 | len = pmtu; | |
180 | else { | |
181 | ohdr->u.aeth = qib_compute_aeth(qp); | |
182 | hwords++; | |
183 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
184 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
185 | e->sent = 1; | |
186 | } | |
187 | bth0 = qp->s_ack_state << 24; | |
188 | bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK; | |
189 | break; | |
190 | ||
191 | default: | |
192 | normal: | |
193 | /* | |
194 | * Send a regular ACK. | |
195 | * Set the s_ack_state so we wait until after sending | |
196 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
197 | * (see above). | |
198 | */ | |
199 | qp->s_ack_state = OP(SEND_ONLY); | |
200 | qp->s_flags &= ~QIB_S_ACK_PENDING; | |
201 | qp->s_cur_sge = NULL; | |
202 | if (qp->s_nak_state) | |
203 | ohdr->u.aeth = | |
204 | cpu_to_be32((qp->r_msn & QIB_MSN_MASK) | | |
205 | (qp->s_nak_state << | |
206 | QIB_AETH_CREDIT_SHIFT)); | |
207 | else | |
208 | ohdr->u.aeth = qib_compute_aeth(qp); | |
209 | hwords++; | |
210 | len = 0; | |
211 | bth0 = OP(ACKNOWLEDGE) << 24; | |
212 | bth2 = qp->s_ack_psn & QIB_PSN_MASK; | |
213 | } | |
214 | qp->s_rdma_ack_cnt++; | |
215 | qp->s_hdrwords = hwords; | |
216 | qp->s_cur_size = len; | |
217 | qib_make_ruc_header(qp, ohdr, bth0, bth2); | |
218 | return 1; | |
219 | ||
220 | bail: | |
221 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
222 | qp->s_flags &= ~(QIB_S_RESP_PENDING | QIB_S_ACK_PENDING); | |
223 | return 0; | |
224 | } | |
225 | ||
226 | /** | |
227 | * qib_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
228 | * @qp: a pointer to the QP | |
229 | * | |
230 | * Return 1 if constructed; otherwise, return 0. | |
231 | */ | |
232 | int qib_make_rc_req(struct qib_qp *qp) | |
233 | { | |
234 | struct qib_ibdev *dev = to_idev(qp->ibqp.device); | |
235 | struct qib_other_headers *ohdr; | |
236 | struct qib_sge_state *ss; | |
237 | struct qib_swqe *wqe; | |
238 | u32 hwords; | |
239 | u32 len; | |
240 | u32 bth0; | |
241 | u32 bth2; | |
242 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); | |
243 | char newreq; | |
244 | unsigned long flags; | |
245 | int ret = 0; | |
246 | int delta; | |
247 | ||
248 | ohdr = &qp->s_hdr.u.oth; | |
249 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) | |
250 | ohdr = &qp->s_hdr.u.l.oth; | |
251 | ||
252 | /* | |
253 | * The lock is needed to synchronize between the sending tasklet, | |
254 | * the receive interrupt handler, and timeout resends. | |
255 | */ | |
256 | spin_lock_irqsave(&qp->s_lock, flags); | |
257 | ||
258 | /* Sending responses has higher priority over sending requests. */ | |
259 | if ((qp->s_flags & QIB_S_RESP_PENDING) && | |
260 | qib_make_rc_ack(dev, qp, ohdr, pmtu)) | |
261 | goto done; | |
262 | ||
263 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) { | |
264 | if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND)) | |
265 | goto bail; | |
266 | /* We are in the error state, flush the work request. */ | |
267 | if (qp->s_last == qp->s_head) | |
268 | goto bail; | |
269 | /* If DMAs are in progress, we can't flush immediately. */ | |
270 | if (atomic_read(&qp->s_dma_busy)) { | |
271 | qp->s_flags |= QIB_S_WAIT_DMA; | |
272 | goto bail; | |
273 | } | |
274 | wqe = get_swqe_ptr(qp, qp->s_last); | |
275 | while (qp->s_last != qp->s_acked) { | |
276 | qib_send_complete(qp, wqe, IB_WC_SUCCESS); | |
277 | if (++qp->s_last >= qp->s_size) | |
278 | qp->s_last = 0; | |
279 | wqe = get_swqe_ptr(qp, qp->s_last); | |
280 | } | |
281 | qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); | |
282 | goto done; | |
283 | } | |
284 | ||
285 | if (qp->s_flags & (QIB_S_WAIT_RNR | QIB_S_WAIT_ACK)) | |
286 | goto bail; | |
287 | ||
288 | if (qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) { | |
289 | if (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { | |
290 | qp->s_flags |= QIB_S_WAIT_PSN; | |
291 | goto bail; | |
292 | } | |
293 | qp->s_sending_psn = qp->s_psn; | |
294 | qp->s_sending_hpsn = qp->s_psn - 1; | |
295 | } | |
296 | ||
297 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
298 | hwords = 5; | |
299 | bth0 = 0; | |
300 | ||
301 | /* Send a request. */ | |
302 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
303 | switch (qp->s_state) { | |
304 | default: | |
305 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_NEXT_SEND_OK)) | |
306 | goto bail; | |
307 | /* | |
308 | * Resend an old request or start a new one. | |
309 | * | |
310 | * We keep track of the current SWQE so that | |
311 | * we don't reset the "furthest progress" state | |
312 | * if we need to back up. | |
313 | */ | |
314 | newreq = 0; | |
315 | if (qp->s_cur == qp->s_tail) { | |
316 | /* Check if send work queue is empty. */ | |
317 | if (qp->s_tail == qp->s_head) | |
318 | goto bail; | |
319 | /* | |
320 | * If a fence is requested, wait for previous | |
321 | * RDMA read and atomic operations to finish. | |
322 | */ | |
323 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
324 | qp->s_num_rd_atomic) { | |
325 | qp->s_flags |= QIB_S_WAIT_FENCE; | |
326 | goto bail; | |
327 | } | |
328 | wqe->psn = qp->s_next_psn; | |
329 | newreq = 1; | |
330 | } | |
331 | /* | |
332 | * Note that we have to be careful not to modify the | |
333 | * original work request since we may need to resend | |
334 | * it. | |
335 | */ | |
336 | len = wqe->length; | |
337 | ss = &qp->s_sge; | |
338 | bth2 = qp->s_psn & QIB_PSN_MASK; | |
339 | switch (wqe->wr.opcode) { | |
340 | case IB_WR_SEND: | |
341 | case IB_WR_SEND_WITH_IMM: | |
342 | /* If no credit, return. */ | |
343 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT) && | |
344 | qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { | |
345 | qp->s_flags |= QIB_S_WAIT_SSN_CREDIT; | |
346 | goto bail; | |
347 | } | |
348 | wqe->lpsn = wqe->psn; | |
349 | if (len > pmtu) { | |
350 | wqe->lpsn += (len - 1) / pmtu; | |
351 | qp->s_state = OP(SEND_FIRST); | |
352 | len = pmtu; | |
353 | break; | |
354 | } | |
355 | if (wqe->wr.opcode == IB_WR_SEND) | |
356 | qp->s_state = OP(SEND_ONLY); | |
357 | else { | |
358 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); | |
359 | /* Immediate data comes after the BTH */ | |
360 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
361 | hwords += 1; | |
362 | } | |
363 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
364 | bth0 |= IB_BTH_SOLICITED; | |
365 | bth2 |= IB_BTH_REQ_ACK; | |
366 | if (++qp->s_cur == qp->s_size) | |
367 | qp->s_cur = 0; | |
368 | break; | |
369 | ||
370 | case IB_WR_RDMA_WRITE: | |
371 | if (newreq && !(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) | |
372 | qp->s_lsn++; | |
373 | /* FALLTHROUGH */ | |
374 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
375 | /* If no credit, return. */ | |
376 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT) && | |
377 | qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { | |
378 | qp->s_flags |= QIB_S_WAIT_SSN_CREDIT; | |
379 | goto bail; | |
380 | } | |
381 | ohdr->u.rc.reth.vaddr = | |
382 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
383 | ohdr->u.rc.reth.rkey = | |
384 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
385 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
386 | hwords += sizeof(struct ib_reth) / sizeof(u32); | |
387 | wqe->lpsn = wqe->psn; | |
388 | if (len > pmtu) { | |
389 | wqe->lpsn += (len - 1) / pmtu; | |
390 | qp->s_state = OP(RDMA_WRITE_FIRST); | |
391 | len = pmtu; | |
392 | break; | |
393 | } | |
394 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
395 | qp->s_state = OP(RDMA_WRITE_ONLY); | |
396 | else { | |
397 | qp->s_state = | |
398 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
399 | /* Immediate data comes after RETH */ | |
400 | ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; | |
401 | hwords += 1; | |
402 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
403 | bth0 |= IB_BTH_SOLICITED; | |
404 | } | |
405 | bth2 |= IB_BTH_REQ_ACK; | |
406 | if (++qp->s_cur == qp->s_size) | |
407 | qp->s_cur = 0; | |
408 | break; | |
409 | ||
410 | case IB_WR_RDMA_READ: | |
411 | /* | |
412 | * Don't allow more operations to be started | |
413 | * than the QP limits allow. | |
414 | */ | |
415 | if (newreq) { | |
416 | if (qp->s_num_rd_atomic >= | |
417 | qp->s_max_rd_atomic) { | |
418 | qp->s_flags |= QIB_S_WAIT_RDMAR; | |
419 | goto bail; | |
420 | } | |
421 | qp->s_num_rd_atomic++; | |
422 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) | |
423 | qp->s_lsn++; | |
424 | /* | |
425 | * Adjust s_next_psn to count the | |
426 | * expected number of responses. | |
427 | */ | |
428 | if (len > pmtu) | |
429 | qp->s_next_psn += (len - 1) / pmtu; | |
430 | wqe->lpsn = qp->s_next_psn++; | |
431 | } | |
432 | ohdr->u.rc.reth.vaddr = | |
433 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
434 | ohdr->u.rc.reth.rkey = | |
435 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
436 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
437 | qp->s_state = OP(RDMA_READ_REQUEST); | |
438 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
439 | ss = NULL; | |
440 | len = 0; | |
441 | bth2 |= IB_BTH_REQ_ACK; | |
442 | if (++qp->s_cur == qp->s_size) | |
443 | qp->s_cur = 0; | |
444 | break; | |
445 | ||
446 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
447 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
448 | /* | |
449 | * Don't allow more operations to be started | |
450 | * than the QP limits allow. | |
451 | */ | |
452 | if (newreq) { | |
453 | if (qp->s_num_rd_atomic >= | |
454 | qp->s_max_rd_atomic) { | |
455 | qp->s_flags |= QIB_S_WAIT_RDMAR; | |
456 | goto bail; | |
457 | } | |
458 | qp->s_num_rd_atomic++; | |
459 | if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) | |
460 | qp->s_lsn++; | |
461 | wqe->lpsn = wqe->psn; | |
462 | } | |
463 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { | |
464 | qp->s_state = OP(COMPARE_SWAP); | |
465 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
466 | wqe->wr.wr.atomic.swap); | |
467 | ohdr->u.atomic_eth.compare_data = cpu_to_be64( | |
468 | wqe->wr.wr.atomic.compare_add); | |
469 | } else { | |
470 | qp->s_state = OP(FETCH_ADD); | |
471 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
472 | wqe->wr.wr.atomic.compare_add); | |
473 | ohdr->u.atomic_eth.compare_data = 0; | |
474 | } | |
475 | ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32( | |
476 | wqe->wr.wr.atomic.remote_addr >> 32); | |
477 | ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32( | |
478 | wqe->wr.wr.atomic.remote_addr); | |
479 | ohdr->u.atomic_eth.rkey = cpu_to_be32( | |
480 | wqe->wr.wr.atomic.rkey); | |
481 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); | |
482 | ss = NULL; | |
483 | len = 0; | |
484 | bth2 |= IB_BTH_REQ_ACK; | |
485 | if (++qp->s_cur == qp->s_size) | |
486 | qp->s_cur = 0; | |
487 | break; | |
488 | ||
489 | default: | |
490 | goto bail; | |
491 | } | |
492 | qp->s_sge.sge = wqe->sg_list[0]; | |
493 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
494 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
495 | qp->s_sge.total_len = wqe->length; | |
496 | qp->s_len = wqe->length; | |
497 | if (newreq) { | |
498 | qp->s_tail++; | |
499 | if (qp->s_tail >= qp->s_size) | |
500 | qp->s_tail = 0; | |
501 | } | |
502 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
503 | qp->s_psn = wqe->lpsn + 1; | |
504 | else { | |
505 | qp->s_psn++; | |
506 | if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0) | |
507 | qp->s_next_psn = qp->s_psn; | |
508 | } | |
509 | break; | |
510 | ||
511 | case OP(RDMA_READ_RESPONSE_FIRST): | |
512 | /* | |
513 | * qp->s_state is normally set to the opcode of the | |
514 | * last packet constructed for new requests and therefore | |
515 | * is never set to RDMA read response. | |
516 | * RDMA_READ_RESPONSE_FIRST is used by the ACK processing | |
517 | * thread to indicate a SEND needs to be restarted from an | |
518 | * earlier PSN without interferring with the sending thread. | |
519 | * See qib_restart_rc(). | |
520 | */ | |
521 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
522 | /* FALLTHROUGH */ | |
523 | case OP(SEND_FIRST): | |
524 | qp->s_state = OP(SEND_MIDDLE); | |
525 | /* FALLTHROUGH */ | |
526 | case OP(SEND_MIDDLE): | |
527 | bth2 = qp->s_psn++ & QIB_PSN_MASK; | |
528 | if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0) | |
529 | qp->s_next_psn = qp->s_psn; | |
530 | ss = &qp->s_sge; | |
531 | len = qp->s_len; | |
532 | if (len > pmtu) { | |
533 | len = pmtu; | |
534 | break; | |
535 | } | |
536 | if (wqe->wr.opcode == IB_WR_SEND) | |
537 | qp->s_state = OP(SEND_LAST); | |
538 | else { | |
539 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
540 | /* Immediate data comes after the BTH */ | |
541 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
542 | hwords += 1; | |
543 | } | |
544 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
545 | bth0 |= IB_BTH_SOLICITED; | |
546 | bth2 |= IB_BTH_REQ_ACK; | |
547 | qp->s_cur++; | |
548 | if (qp->s_cur >= qp->s_size) | |
549 | qp->s_cur = 0; | |
550 | break; | |
551 | ||
552 | case OP(RDMA_READ_RESPONSE_LAST): | |
553 | /* | |
554 | * qp->s_state is normally set to the opcode of the | |
555 | * last packet constructed for new requests and therefore | |
556 | * is never set to RDMA read response. | |
557 | * RDMA_READ_RESPONSE_LAST is used by the ACK processing | |
558 | * thread to indicate a RDMA write needs to be restarted from | |
559 | * an earlier PSN without interferring with the sending thread. | |
560 | * See qib_restart_rc(). | |
561 | */ | |
562 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
563 | /* FALLTHROUGH */ | |
564 | case OP(RDMA_WRITE_FIRST): | |
565 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
566 | /* FALLTHROUGH */ | |
567 | case OP(RDMA_WRITE_MIDDLE): | |
568 | bth2 = qp->s_psn++ & QIB_PSN_MASK; | |
569 | if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0) | |
570 | qp->s_next_psn = qp->s_psn; | |
571 | ss = &qp->s_sge; | |
572 | len = qp->s_len; | |
573 | if (len > pmtu) { | |
574 | len = pmtu; | |
575 | break; | |
576 | } | |
577 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
578 | qp->s_state = OP(RDMA_WRITE_LAST); | |
579 | else { | |
580 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
581 | /* Immediate data comes after the BTH */ | |
582 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
583 | hwords += 1; | |
584 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
585 | bth0 |= IB_BTH_SOLICITED; | |
586 | } | |
587 | bth2 |= IB_BTH_REQ_ACK; | |
588 | qp->s_cur++; | |
589 | if (qp->s_cur >= qp->s_size) | |
590 | qp->s_cur = 0; | |
591 | break; | |
592 | ||
593 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
594 | /* | |
595 | * qp->s_state is normally set to the opcode of the | |
596 | * last packet constructed for new requests and therefore | |
597 | * is never set to RDMA read response. | |
598 | * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing | |
599 | * thread to indicate a RDMA read needs to be restarted from | |
600 | * an earlier PSN without interferring with the sending thread. | |
601 | * See qib_restart_rc(). | |
602 | */ | |
603 | len = ((qp->s_psn - wqe->psn) & QIB_PSN_MASK) * pmtu; | |
604 | ohdr->u.rc.reth.vaddr = | |
605 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len); | |
606 | ohdr->u.rc.reth.rkey = | |
607 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
608 | ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len); | |
609 | qp->s_state = OP(RDMA_READ_REQUEST); | |
610 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
611 | bth2 = (qp->s_psn & QIB_PSN_MASK) | IB_BTH_REQ_ACK; | |
612 | qp->s_psn = wqe->lpsn + 1; | |
613 | ss = NULL; | |
614 | len = 0; | |
615 | qp->s_cur++; | |
616 | if (qp->s_cur == qp->s_size) | |
617 | qp->s_cur = 0; | |
618 | break; | |
619 | } | |
620 | qp->s_sending_hpsn = bth2; | |
621 | delta = (((int) bth2 - (int) wqe->psn) << 8) >> 8; | |
622 | if (delta && delta % QIB_PSN_CREDIT == 0) | |
623 | bth2 |= IB_BTH_REQ_ACK; | |
624 | if (qp->s_flags & QIB_S_SEND_ONE) { | |
625 | qp->s_flags &= ~QIB_S_SEND_ONE; | |
626 | qp->s_flags |= QIB_S_WAIT_ACK; | |
627 | bth2 |= IB_BTH_REQ_ACK; | |
628 | } | |
629 | qp->s_len -= len; | |
630 | qp->s_hdrwords = hwords; | |
631 | qp->s_cur_sge = ss; | |
632 | qp->s_cur_size = len; | |
633 | qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), bth2); | |
634 | done: | |
635 | ret = 1; | |
636 | goto unlock; | |
637 | ||
638 | bail: | |
639 | qp->s_flags &= ~QIB_S_BUSY; | |
640 | unlock: | |
641 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
642 | return ret; | |
643 | } | |
644 | ||
645 | /** | |
646 | * qib_send_rc_ack - Construct an ACK packet and send it | |
647 | * @qp: a pointer to the QP | |
648 | * | |
649 | * This is called from qib_rc_rcv() and qib_kreceive(). | |
650 | * Note that RDMA reads and atomics are handled in the | |
651 | * send side QP state and tasklet. | |
652 | */ | |
653 | void qib_send_rc_ack(struct qib_qp *qp) | |
654 | { | |
655 | struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device); | |
656 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
657 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); | |
658 | u64 pbc; | |
659 | u16 lrh0; | |
660 | u32 bth0; | |
661 | u32 hwords; | |
662 | u32 pbufn; | |
663 | u32 __iomem *piobuf; | |
664 | struct qib_ib_header hdr; | |
665 | struct qib_other_headers *ohdr; | |
666 | u32 control; | |
667 | unsigned long flags; | |
668 | ||
669 | spin_lock_irqsave(&qp->s_lock, flags); | |
670 | ||
671 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) | |
672 | goto unlock; | |
673 | ||
674 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ | |
675 | if ((qp->s_flags & QIB_S_RESP_PENDING) || qp->s_rdma_ack_cnt) | |
676 | goto queue_ack; | |
677 | ||
678 | /* Construct the header with s_lock held so APM doesn't change it. */ | |
679 | ohdr = &hdr.u.oth; | |
680 | lrh0 = QIB_LRH_BTH; | |
681 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ | |
682 | hwords = 6; | |
683 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
684 | hwords += qib_make_grh(ibp, &hdr.u.l.grh, | |
685 | &qp->remote_ah_attr.grh, hwords, 0); | |
686 | ohdr = &hdr.u.l.oth; | |
687 | lrh0 = QIB_LRH_GRH; | |
688 | } | |
689 | /* read pkey_index w/o lock (its atomic) */ | |
690 | bth0 = qib_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24); | |
691 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
692 | bth0 |= IB_BTH_MIG_REQ; | |
693 | if (qp->r_nak_state) | |
694 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & QIB_MSN_MASK) | | |
695 | (qp->r_nak_state << | |
696 | QIB_AETH_CREDIT_SHIFT)); | |
697 | else | |
698 | ohdr->u.aeth = qib_compute_aeth(qp); | |
699 | lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | | |
700 | qp->remote_ah_attr.sl << 4; | |
701 | hdr.lrh[0] = cpu_to_be16(lrh0); | |
702 | hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
703 | hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); | |
704 | hdr.lrh[3] = cpu_to_be16(ppd->lid | qp->remote_ah_attr.src_path_bits); | |
705 | ohdr->bth[0] = cpu_to_be32(bth0); | |
706 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
707 | ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & QIB_PSN_MASK); | |
708 | ||
709 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
710 | ||
711 | /* Don't try to send ACKs if the link isn't ACTIVE */ | |
712 | if (!(ppd->lflags & QIBL_LINKACTIVE)) | |
713 | goto done; | |
714 | ||
715 | control = dd->f_setpbc_control(ppd, hwords + SIZE_OF_CRC, | |
716 | qp->s_srate, lrh0 >> 12); | |
717 | /* length is + 1 for the control dword */ | |
718 | pbc = ((u64) control << 32) | (hwords + 1); | |
719 | ||
720 | piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn); | |
721 | if (!piobuf) { | |
722 | /* | |
723 | * We are out of PIO buffers at the moment. | |
724 | * Pass responsibility for sending the ACK to the | |
725 | * send tasklet so that when a PIO buffer becomes | |
726 | * available, the ACK is sent ahead of other outgoing | |
727 | * packets. | |
728 | */ | |
729 | spin_lock_irqsave(&qp->s_lock, flags); | |
730 | goto queue_ack; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Write the pbc. | |
735 | * We have to flush after the PBC for correctness | |
736 | * on some cpus or WC buffer can be written out of order. | |
737 | */ | |
738 | writeq(pbc, piobuf); | |
739 | ||
740 | if (dd->flags & QIB_PIO_FLUSH_WC) { | |
741 | u32 *hdrp = (u32 *) &hdr; | |
742 | ||
743 | qib_flush_wc(); | |
744 | qib_pio_copy(piobuf + 2, hdrp, hwords - 1); | |
745 | qib_flush_wc(); | |
746 | __raw_writel(hdrp[hwords - 1], piobuf + hwords + 1); | |
747 | } else | |
748 | qib_pio_copy(piobuf + 2, (u32 *) &hdr, hwords); | |
749 | ||
750 | if (dd->flags & QIB_USE_SPCL_TRIG) { | |
751 | u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023; | |
752 | ||
753 | qib_flush_wc(); | |
754 | __raw_writel(0xaebecede, piobuf + spcl_off); | |
755 | } | |
756 | ||
757 | qib_flush_wc(); | |
758 | qib_sendbuf_done(dd, pbufn); | |
759 | ||
760 | ibp->n_unicast_xmit++; | |
761 | goto done; | |
762 | ||
763 | queue_ack: | |
764 | if (ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) { | |
765 | ibp->n_rc_qacks++; | |
766 | qp->s_flags |= QIB_S_ACK_PENDING | QIB_S_RESP_PENDING; | |
767 | qp->s_nak_state = qp->r_nak_state; | |
768 | qp->s_ack_psn = qp->r_ack_psn; | |
769 | ||
770 | /* Schedule the send tasklet. */ | |
771 | qib_schedule_send(qp); | |
772 | } | |
773 | unlock: | |
774 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
775 | done: | |
776 | return; | |
777 | } | |
778 | ||
779 | /** | |
780 | * reset_psn - reset the QP state to send starting from PSN | |
781 | * @qp: the QP | |
782 | * @psn: the packet sequence number to restart at | |
783 | * | |
784 | * This is called from qib_rc_rcv() to process an incoming RC ACK | |
785 | * for the given QP. | |
786 | * Called at interrupt level with the QP s_lock held. | |
787 | */ | |
788 | static void reset_psn(struct qib_qp *qp, u32 psn) | |
789 | { | |
790 | u32 n = qp->s_acked; | |
791 | struct qib_swqe *wqe = get_swqe_ptr(qp, n); | |
792 | u32 opcode; | |
793 | ||
794 | qp->s_cur = n; | |
795 | ||
796 | /* | |
797 | * If we are starting the request from the beginning, | |
798 | * let the normal send code handle initialization. | |
799 | */ | |
800 | if (qib_cmp24(psn, wqe->psn) <= 0) { | |
801 | qp->s_state = OP(SEND_LAST); | |
802 | goto done; | |
803 | } | |
804 | ||
805 | /* Find the work request opcode corresponding to the given PSN. */ | |
806 | opcode = wqe->wr.opcode; | |
807 | for (;;) { | |
808 | int diff; | |
809 | ||
810 | if (++n == qp->s_size) | |
811 | n = 0; | |
812 | if (n == qp->s_tail) | |
813 | break; | |
814 | wqe = get_swqe_ptr(qp, n); | |
815 | diff = qib_cmp24(psn, wqe->psn); | |
816 | if (diff < 0) | |
817 | break; | |
818 | qp->s_cur = n; | |
819 | /* | |
820 | * If we are starting the request from the beginning, | |
821 | * let the normal send code handle initialization. | |
822 | */ | |
823 | if (diff == 0) { | |
824 | qp->s_state = OP(SEND_LAST); | |
825 | goto done; | |
826 | } | |
827 | opcode = wqe->wr.opcode; | |
828 | } | |
829 | ||
830 | /* | |
831 | * Set the state to restart in the middle of a request. | |
832 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
833 | * See qib_make_rc_req(). | |
834 | */ | |
835 | switch (opcode) { | |
836 | case IB_WR_SEND: | |
837 | case IB_WR_SEND_WITH_IMM: | |
838 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
839 | break; | |
840 | ||
841 | case IB_WR_RDMA_WRITE: | |
842 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
843 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
844 | break; | |
845 | ||
846 | case IB_WR_RDMA_READ: | |
847 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
848 | break; | |
849 | ||
850 | default: | |
851 | /* | |
852 | * This case shouldn't happen since its only | |
853 | * one PSN per req. | |
854 | */ | |
855 | qp->s_state = OP(SEND_LAST); | |
856 | } | |
857 | done: | |
858 | qp->s_psn = psn; | |
859 | /* | |
860 | * Set QIB_S_WAIT_PSN as qib_rc_complete() may start the timer | |
861 | * asynchronously before the send tasklet can get scheduled. | |
862 | * Doing it in qib_make_rc_req() is too late. | |
863 | */ | |
864 | if ((qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) && | |
865 | (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) | |
866 | qp->s_flags |= QIB_S_WAIT_PSN; | |
867 | } | |
868 | ||
869 | /* | |
870 | * Back up requester to resend the last un-ACKed request. | |
a5210c12 | 871 | * The QP r_lock and s_lock should be held and interrupts disabled. |
f931551b RC |
872 | */ |
873 | static void qib_restart_rc(struct qib_qp *qp, u32 psn, int wait) | |
874 | { | |
875 | struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_acked); | |
876 | struct qib_ibport *ibp; | |
877 | ||
878 | if (qp->s_retry == 0) { | |
879 | if (qp->s_mig_state == IB_MIG_ARMED) { | |
880 | qib_migrate_qp(qp); | |
881 | qp->s_retry = qp->s_retry_cnt; | |
882 | } else if (qp->s_last == qp->s_acked) { | |
883 | qib_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); | |
884 | qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
885 | return; | |
886 | } else /* XXX need to handle delayed completion */ | |
887 | return; | |
888 | } else | |
889 | qp->s_retry--; | |
890 | ||
891 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
892 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
893 | ibp->n_rc_resends++; | |
894 | else | |
895 | ibp->n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK; | |
896 | ||
897 | qp->s_flags &= ~(QIB_S_WAIT_FENCE | QIB_S_WAIT_RDMAR | | |
898 | QIB_S_WAIT_SSN_CREDIT | QIB_S_WAIT_PSN | | |
899 | QIB_S_WAIT_ACK); | |
900 | if (wait) | |
901 | qp->s_flags |= QIB_S_SEND_ONE; | |
902 | reset_psn(qp, psn); | |
903 | } | |
904 | ||
905 | /* | |
906 | * This is called from s_timer for missing responses. | |
907 | */ | |
908 | static void rc_timeout(unsigned long arg) | |
909 | { | |
910 | struct qib_qp *qp = (struct qib_qp *)arg; | |
911 | struct qib_ibport *ibp; | |
912 | unsigned long flags; | |
913 | ||
a5210c12 RC |
914 | spin_lock_irqsave(&qp->r_lock, flags); |
915 | spin_lock(&qp->s_lock); | |
f931551b RC |
916 | if (qp->s_flags & QIB_S_TIMER) { |
917 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
918 | ibp->n_rc_timeouts++; | |
919 | qp->s_flags &= ~QIB_S_TIMER; | |
920 | del_timer(&qp->s_timer); | |
921 | qib_restart_rc(qp, qp->s_last_psn + 1, 1); | |
922 | qib_schedule_send(qp); | |
923 | } | |
a5210c12 RC |
924 | spin_unlock(&qp->s_lock); |
925 | spin_unlock_irqrestore(&qp->r_lock, flags); | |
f931551b RC |
926 | } |
927 | ||
928 | /* | |
929 | * This is called from s_timer for RNR timeouts. | |
930 | */ | |
931 | void qib_rc_rnr_retry(unsigned long arg) | |
932 | { | |
933 | struct qib_qp *qp = (struct qib_qp *)arg; | |
934 | unsigned long flags; | |
935 | ||
936 | spin_lock_irqsave(&qp->s_lock, flags); | |
937 | if (qp->s_flags & QIB_S_WAIT_RNR) { | |
938 | qp->s_flags &= ~QIB_S_WAIT_RNR; | |
939 | del_timer(&qp->s_timer); | |
940 | qib_schedule_send(qp); | |
941 | } | |
942 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
943 | } | |
944 | ||
945 | /* | |
946 | * Set qp->s_sending_psn to the next PSN after the given one. | |
947 | * This would be psn+1 except when RDMA reads are present. | |
948 | */ | |
949 | static void reset_sending_psn(struct qib_qp *qp, u32 psn) | |
950 | { | |
951 | struct qib_swqe *wqe; | |
952 | u32 n = qp->s_last; | |
953 | ||
954 | /* Find the work request corresponding to the given PSN. */ | |
955 | for (;;) { | |
956 | wqe = get_swqe_ptr(qp, n); | |
957 | if (qib_cmp24(psn, wqe->lpsn) <= 0) { | |
958 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
959 | qp->s_sending_psn = wqe->lpsn + 1; | |
960 | else | |
961 | qp->s_sending_psn = psn + 1; | |
962 | break; | |
963 | } | |
964 | if (++n == qp->s_size) | |
965 | n = 0; | |
966 | if (n == qp->s_tail) | |
967 | break; | |
968 | } | |
969 | } | |
970 | ||
971 | /* | |
972 | * This should be called with the QP s_lock held and interrupts disabled. | |
973 | */ | |
974 | void qib_rc_send_complete(struct qib_qp *qp, struct qib_ib_header *hdr) | |
975 | { | |
976 | struct qib_other_headers *ohdr; | |
977 | struct qib_swqe *wqe; | |
978 | struct ib_wc wc; | |
979 | unsigned i; | |
980 | u32 opcode; | |
981 | u32 psn; | |
982 | ||
983 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND)) | |
984 | return; | |
985 | ||
986 | /* Find out where the BTH is */ | |
987 | if ((be16_to_cpu(hdr->lrh[0]) & 3) == QIB_LRH_BTH) | |
988 | ohdr = &hdr->u.oth; | |
989 | else | |
990 | ohdr = &hdr->u.l.oth; | |
991 | ||
992 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; | |
993 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
994 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
995 | WARN_ON(!qp->s_rdma_ack_cnt); | |
996 | qp->s_rdma_ack_cnt--; | |
997 | return; | |
998 | } | |
999 | ||
1000 | psn = be32_to_cpu(ohdr->bth[2]); | |
1001 | reset_sending_psn(qp, psn); | |
1002 | ||
1003 | /* | |
1004 | * Start timer after a packet requesting an ACK has been sent and | |
1005 | * there are still requests that haven't been acked. | |
1006 | */ | |
1007 | if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail && | |
1008 | !(qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR | QIB_S_WAIT_PSN))) | |
1009 | start_timer(qp); | |
1010 | ||
1011 | while (qp->s_last != qp->s_acked) { | |
1012 | wqe = get_swqe_ptr(qp, qp->s_last); | |
1013 | if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) >= 0 && | |
1014 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) | |
1015 | break; | |
1016 | for (i = 0; i < wqe->wr.num_sge; i++) { | |
1017 | struct qib_sge *sge = &wqe->sg_list[i]; | |
1018 | ||
1019 | atomic_dec(&sge->mr->refcount); | |
1020 | } | |
1021 | /* Post a send completion queue entry if requested. */ | |
1022 | if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || | |
1023 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { | |
1024 | memset(&wc, 0, sizeof wc); | |
1025 | wc.wr_id = wqe->wr.wr_id; | |
1026 | wc.status = IB_WC_SUCCESS; | |
1027 | wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; | |
1028 | wc.byte_len = wqe->length; | |
1029 | wc.qp = &qp->ibqp; | |
1030 | qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
1031 | } | |
1032 | if (++qp->s_last >= qp->s_size) | |
1033 | qp->s_last = 0; | |
1034 | } | |
1035 | /* | |
1036 | * If we were waiting for sends to complete before resending, | |
1037 | * and they are now complete, restart sending. | |
1038 | */ | |
1039 | if (qp->s_flags & QIB_S_WAIT_PSN && | |
1040 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { | |
1041 | qp->s_flags &= ~QIB_S_WAIT_PSN; | |
1042 | qp->s_sending_psn = qp->s_psn; | |
1043 | qp->s_sending_hpsn = qp->s_psn - 1; | |
1044 | qib_schedule_send(qp); | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | static inline void update_last_psn(struct qib_qp *qp, u32 psn) | |
1049 | { | |
1050 | qp->s_last_psn = psn; | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Generate a SWQE completion. | |
1055 | * This is similar to qib_send_complete but has to check to be sure | |
1056 | * that the SGEs are not being referenced if the SWQE is being resent. | |
1057 | */ | |
1058 | static struct qib_swqe *do_rc_completion(struct qib_qp *qp, | |
1059 | struct qib_swqe *wqe, | |
1060 | struct qib_ibport *ibp) | |
1061 | { | |
1062 | struct ib_wc wc; | |
1063 | unsigned i; | |
1064 | ||
1065 | /* | |
1066 | * Don't decrement refcount and don't generate a | |
1067 | * completion if the SWQE is being resent until the send | |
1068 | * is finished. | |
1069 | */ | |
1070 | if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) < 0 || | |
1071 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { | |
1072 | for (i = 0; i < wqe->wr.num_sge; i++) { | |
1073 | struct qib_sge *sge = &wqe->sg_list[i]; | |
1074 | ||
1075 | atomic_dec(&sge->mr->refcount); | |
1076 | } | |
1077 | /* Post a send completion queue entry if requested. */ | |
1078 | if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || | |
1079 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { | |
1080 | memset(&wc, 0, sizeof wc); | |
1081 | wc.wr_id = wqe->wr.wr_id; | |
1082 | wc.status = IB_WC_SUCCESS; | |
1083 | wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; | |
1084 | wc.byte_len = wqe->length; | |
1085 | wc.qp = &qp->ibqp; | |
1086 | qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
1087 | } | |
1088 | if (++qp->s_last >= qp->s_size) | |
1089 | qp->s_last = 0; | |
1090 | } else | |
1091 | ibp->n_rc_delayed_comp++; | |
1092 | ||
1093 | qp->s_retry = qp->s_retry_cnt; | |
1094 | update_last_psn(qp, wqe->lpsn); | |
1095 | ||
1096 | /* | |
1097 | * If we are completing a request which is in the process of | |
1098 | * being resent, we can stop resending it since we know the | |
1099 | * responder has already seen it. | |
1100 | */ | |
1101 | if (qp->s_acked == qp->s_cur) { | |
1102 | if (++qp->s_cur >= qp->s_size) | |
1103 | qp->s_cur = 0; | |
1104 | qp->s_acked = qp->s_cur; | |
1105 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
1106 | if (qp->s_acked != qp->s_tail) { | |
1107 | qp->s_state = OP(SEND_LAST); | |
1108 | qp->s_psn = wqe->psn; | |
1109 | } | |
1110 | } else { | |
1111 | if (++qp->s_acked >= qp->s_size) | |
1112 | qp->s_acked = 0; | |
1113 | if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur) | |
1114 | qp->s_draining = 0; | |
1115 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1116 | } | |
1117 | return wqe; | |
1118 | } | |
1119 | ||
1120 | /** | |
1121 | * do_rc_ack - process an incoming RC ACK | |
1122 | * @qp: the QP the ACK came in on | |
1123 | * @psn: the packet sequence number of the ACK | |
1124 | * @opcode: the opcode of the request that resulted in the ACK | |
1125 | * | |
1126 | * This is called from qib_rc_rcv_resp() to process an incoming RC ACK | |
1127 | * for the given QP. | |
1128 | * Called at interrupt level with the QP s_lock held. | |
1129 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). | |
1130 | */ | |
1131 | static int do_rc_ack(struct qib_qp *qp, u32 aeth, u32 psn, int opcode, | |
1132 | u64 val, struct qib_ctxtdata *rcd) | |
1133 | { | |
1134 | struct qib_ibport *ibp; | |
1135 | enum ib_wc_status status; | |
1136 | struct qib_swqe *wqe; | |
1137 | int ret = 0; | |
1138 | u32 ack_psn; | |
1139 | int diff; | |
1140 | ||
1141 | /* Remove QP from retry timer */ | |
1142 | if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) { | |
1143 | qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR); | |
1144 | del_timer(&qp->s_timer); | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
1149 | * requests and implicitly NAK RDMA read and atomic requests issued | |
1150 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
1151 | * request but will include an ACK'ed request(s). | |
1152 | */ | |
1153 | ack_psn = psn; | |
1154 | if (aeth >> 29) | |
1155 | ack_psn--; | |
1156 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1157 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
1158 | ||
1159 | /* | |
1160 | * The MSN might be for a later WQE than the PSN indicates so | |
1161 | * only complete WQEs that the PSN finishes. | |
1162 | */ | |
1163 | while ((diff = qib_cmp24(ack_psn, wqe->lpsn)) >= 0) { | |
1164 | /* | |
1165 | * RDMA_READ_RESPONSE_ONLY is a special case since | |
1166 | * we want to generate completion events for everything | |
1167 | * before the RDMA read, copy the data, then generate | |
1168 | * the completion for the read. | |
1169 | */ | |
1170 | if (wqe->wr.opcode == IB_WR_RDMA_READ && | |
1171 | opcode == OP(RDMA_READ_RESPONSE_ONLY) && | |
1172 | diff == 0) { | |
1173 | ret = 1; | |
1174 | goto bail; | |
1175 | } | |
1176 | /* | |
1177 | * If this request is a RDMA read or atomic, and the ACK is | |
1178 | * for a later operation, this ACK NAKs the RDMA read or | |
1179 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
1180 | * can ACK a RDMA read and likewise for atomic ops. Note | |
1181 | * that the NAK case can only happen if relaxed ordering is | |
1182 | * used and requests are sent after an RDMA read or atomic | |
1183 | * is sent but before the response is received. | |
1184 | */ | |
1185 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
1186 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || | |
1187 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1188 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
1189 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { | |
1190 | /* Retry this request. */ | |
1191 | if (!(qp->r_flags & QIB_R_RDMAR_SEQ)) { | |
1192 | qp->r_flags |= QIB_R_RDMAR_SEQ; | |
1193 | qib_restart_rc(qp, qp->s_last_psn + 1, 0); | |
1194 | if (list_empty(&qp->rspwait)) { | |
1195 | qp->r_flags |= QIB_R_RSP_SEND; | |
1196 | atomic_inc(&qp->refcount); | |
1197 | list_add_tail(&qp->rspwait, | |
1198 | &rcd->qp_wait_list); | |
1199 | } | |
1200 | } | |
1201 | /* | |
1202 | * No need to process the ACK/NAK since we are | |
1203 | * restarting an earlier request. | |
1204 | */ | |
1205 | goto bail; | |
1206 | } | |
1207 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1208 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { | |
1209 | u64 *vaddr = wqe->sg_list[0].vaddr; | |
1210 | *vaddr = val; | |
1211 | } | |
1212 | if (qp->s_num_rd_atomic && | |
1213 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1214 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1215 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
1216 | qp->s_num_rd_atomic--; | |
1217 | /* Restart sending task if fence is complete */ | |
1218 | if ((qp->s_flags & QIB_S_WAIT_FENCE) && | |
1219 | !qp->s_num_rd_atomic) { | |
1220 | qp->s_flags &= ~(QIB_S_WAIT_FENCE | | |
1221 | QIB_S_WAIT_ACK); | |
1222 | qib_schedule_send(qp); | |
1223 | } else if (qp->s_flags & QIB_S_WAIT_RDMAR) { | |
1224 | qp->s_flags &= ~(QIB_S_WAIT_RDMAR | | |
1225 | QIB_S_WAIT_ACK); | |
1226 | qib_schedule_send(qp); | |
1227 | } | |
1228 | } | |
1229 | wqe = do_rc_completion(qp, wqe, ibp); | |
1230 | if (qp->s_acked == qp->s_tail) | |
1231 | break; | |
1232 | } | |
1233 | ||
1234 | switch (aeth >> 29) { | |
1235 | case 0: /* ACK */ | |
1236 | ibp->n_rc_acks++; | |
1237 | if (qp->s_acked != qp->s_tail) { | |
1238 | /* | |
1239 | * We are expecting more ACKs so | |
1240 | * reset the retransmit timer. | |
1241 | */ | |
1242 | start_timer(qp); | |
1243 | /* | |
1244 | * We can stop resending the earlier packets and | |
1245 | * continue with the next packet the receiver wants. | |
1246 | */ | |
1247 | if (qib_cmp24(qp->s_psn, psn) <= 0) | |
1248 | reset_psn(qp, psn + 1); | |
1249 | } else if (qib_cmp24(qp->s_psn, psn) <= 0) { | |
1250 | qp->s_state = OP(SEND_LAST); | |
1251 | qp->s_psn = psn + 1; | |
1252 | } | |
1253 | if (qp->s_flags & QIB_S_WAIT_ACK) { | |
1254 | qp->s_flags &= ~QIB_S_WAIT_ACK; | |
1255 | qib_schedule_send(qp); | |
1256 | } | |
1257 | qib_get_credit(qp, aeth); | |
1258 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1259 | qp->s_retry = qp->s_retry_cnt; | |
1260 | update_last_psn(qp, psn); | |
1261 | ret = 1; | |
1262 | goto bail; | |
1263 | ||
1264 | case 1: /* RNR NAK */ | |
1265 | ibp->n_rnr_naks++; | |
1266 | if (qp->s_acked == qp->s_tail) | |
1267 | goto bail; | |
1268 | if (qp->s_flags & QIB_S_WAIT_RNR) | |
1269 | goto bail; | |
1270 | if (qp->s_rnr_retry == 0) { | |
1271 | status = IB_WC_RNR_RETRY_EXC_ERR; | |
1272 | goto class_b; | |
1273 | } | |
1274 | if (qp->s_rnr_retry_cnt < 7) | |
1275 | qp->s_rnr_retry--; | |
1276 | ||
1277 | /* The last valid PSN is the previous PSN. */ | |
1278 | update_last_psn(qp, psn - 1); | |
1279 | ||
1280 | ibp->n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK; | |
1281 | ||
1282 | reset_psn(qp, psn); | |
1283 | ||
1284 | qp->s_flags &= ~(QIB_S_WAIT_SSN_CREDIT | QIB_S_WAIT_ACK); | |
1285 | qp->s_flags |= QIB_S_WAIT_RNR; | |
1286 | qp->s_timer.function = qib_rc_rnr_retry; | |
1287 | qp->s_timer.expires = jiffies + usecs_to_jiffies( | |
1288 | ib_qib_rnr_table[(aeth >> QIB_AETH_CREDIT_SHIFT) & | |
1289 | QIB_AETH_CREDIT_MASK]); | |
1290 | add_timer(&qp->s_timer); | |
1291 | goto bail; | |
1292 | ||
1293 | case 3: /* NAK */ | |
1294 | if (qp->s_acked == qp->s_tail) | |
1295 | goto bail; | |
1296 | /* The last valid PSN is the previous PSN. */ | |
1297 | update_last_psn(qp, psn - 1); | |
1298 | switch ((aeth >> QIB_AETH_CREDIT_SHIFT) & | |
1299 | QIB_AETH_CREDIT_MASK) { | |
1300 | case 0: /* PSN sequence error */ | |
1301 | ibp->n_seq_naks++; | |
1302 | /* | |
1303 | * Back up to the responder's expected PSN. | |
1304 | * Note that we might get a NAK in the middle of an | |
1305 | * RDMA READ response which terminates the RDMA | |
1306 | * READ. | |
1307 | */ | |
1308 | qib_restart_rc(qp, psn, 0); | |
1309 | qib_schedule_send(qp); | |
1310 | break; | |
1311 | ||
1312 | case 1: /* Invalid Request */ | |
1313 | status = IB_WC_REM_INV_REQ_ERR; | |
1314 | ibp->n_other_naks++; | |
1315 | goto class_b; | |
1316 | ||
1317 | case 2: /* Remote Access Error */ | |
1318 | status = IB_WC_REM_ACCESS_ERR; | |
1319 | ibp->n_other_naks++; | |
1320 | goto class_b; | |
1321 | ||
1322 | case 3: /* Remote Operation Error */ | |
1323 | status = IB_WC_REM_OP_ERR; | |
1324 | ibp->n_other_naks++; | |
1325 | class_b: | |
1326 | if (qp->s_last == qp->s_acked) { | |
1327 | qib_send_complete(qp, wqe, status); | |
1328 | qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
1329 | } | |
1330 | break; | |
1331 | ||
1332 | default: | |
1333 | /* Ignore other reserved NAK error codes */ | |
1334 | goto reserved; | |
1335 | } | |
1336 | qp->s_retry = qp->s_retry_cnt; | |
1337 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1338 | goto bail; | |
1339 | ||
1340 | default: /* 2: reserved */ | |
1341 | reserved: | |
1342 | /* Ignore reserved NAK codes. */ | |
1343 | goto bail; | |
1344 | } | |
1345 | ||
1346 | bail: | |
1347 | return ret; | |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * We have seen an out of sequence RDMA read middle or last packet. | |
1352 | * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE. | |
1353 | */ | |
1354 | static void rdma_seq_err(struct qib_qp *qp, struct qib_ibport *ibp, u32 psn, | |
1355 | struct qib_ctxtdata *rcd) | |
1356 | { | |
1357 | struct qib_swqe *wqe; | |
1358 | ||
1359 | /* Remove QP from retry timer */ | |
1360 | if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) { | |
1361 | qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR); | |
1362 | del_timer(&qp->s_timer); | |
1363 | } | |
1364 | ||
1365 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1366 | ||
1367 | while (qib_cmp24(psn, wqe->lpsn) > 0) { | |
1368 | if (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1369 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1370 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) | |
1371 | break; | |
1372 | wqe = do_rc_completion(qp, wqe, ibp); | |
1373 | } | |
1374 | ||
1375 | ibp->n_rdma_seq++; | |
1376 | qp->r_flags |= QIB_R_RDMAR_SEQ; | |
1377 | qib_restart_rc(qp, qp->s_last_psn + 1, 0); | |
1378 | if (list_empty(&qp->rspwait)) { | |
1379 | qp->r_flags |= QIB_R_RSP_SEND; | |
1380 | atomic_inc(&qp->refcount); | |
1381 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | /** | |
1386 | * qib_rc_rcv_resp - process an incoming RC response packet | |
1387 | * @ibp: the port this packet came in on | |
1388 | * @ohdr: the other headers for this packet | |
1389 | * @data: the packet data | |
1390 | * @tlen: the packet length | |
1391 | * @qp: the QP for this packet | |
1392 | * @opcode: the opcode for this packet | |
1393 | * @psn: the packet sequence number for this packet | |
1394 | * @hdrsize: the header length | |
1395 | * @pmtu: the path MTU | |
1396 | * | |
1397 | * This is called from qib_rc_rcv() to process an incoming RC response | |
1398 | * packet for the given QP. | |
1399 | * Called at interrupt level. | |
1400 | */ | |
1401 | static void qib_rc_rcv_resp(struct qib_ibport *ibp, | |
1402 | struct qib_other_headers *ohdr, | |
1403 | void *data, u32 tlen, | |
1404 | struct qib_qp *qp, | |
1405 | u32 opcode, | |
1406 | u32 psn, u32 hdrsize, u32 pmtu, | |
1407 | struct qib_ctxtdata *rcd) | |
1408 | { | |
1409 | struct qib_swqe *wqe; | |
dd04e43d | 1410 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); |
f931551b RC |
1411 | enum ib_wc_status status; |
1412 | unsigned long flags; | |
1413 | int diff; | |
1414 | u32 pad; | |
1415 | u32 aeth; | |
1416 | u64 val; | |
1417 | ||
dd04e43d MM |
1418 | if (opcode != OP(RDMA_READ_RESPONSE_MIDDLE)) { |
1419 | /* | |
1420 | * If ACK'd PSN on SDMA busy list try to make progress to | |
1421 | * reclaim SDMA credits. | |
1422 | */ | |
1423 | if ((qib_cmp24(psn, qp->s_sending_psn) >= 0) && | |
1424 | (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) { | |
1425 | ||
1426 | /* | |
1427 | * If send tasklet not running attempt to progress | |
1428 | * SDMA queue. | |
1429 | */ | |
1430 | if (!(qp->s_flags & QIB_S_BUSY)) { | |
1431 | /* Acquire SDMA Lock */ | |
1432 | spin_lock_irqsave(&ppd->sdma_lock, flags); | |
1433 | /* Invoke sdma make progress */ | |
1434 | qib_sdma_make_progress(ppd); | |
1435 | /* Release SDMA Lock */ | |
1436 | spin_unlock_irqrestore(&ppd->sdma_lock, flags); | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | ||
f931551b | 1441 | spin_lock_irqsave(&qp->s_lock, flags); |
414ed90c MM |
1442 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) |
1443 | goto ack_done; | |
f931551b | 1444 | |
f931551b RC |
1445 | /* Ignore invalid responses. */ |
1446 | if (qib_cmp24(psn, qp->s_next_psn) >= 0) | |
1447 | goto ack_done; | |
1448 | ||
1449 | /* Ignore duplicate responses. */ | |
1450 | diff = qib_cmp24(psn, qp->s_last_psn); | |
1451 | if (unlikely(diff <= 0)) { | |
1452 | /* Update credits for "ghost" ACKs */ | |
1453 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1454 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1455 | if ((aeth >> 29) == 0) | |
1456 | qib_get_credit(qp, aeth); | |
1457 | } | |
1458 | goto ack_done; | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Skip everything other than the PSN we expect, if we are waiting | |
1463 | * for a reply to a restarted RDMA read or atomic op. | |
1464 | */ | |
1465 | if (qp->r_flags & QIB_R_RDMAR_SEQ) { | |
1466 | if (qib_cmp24(psn, qp->s_last_psn + 1) != 0) | |
1467 | goto ack_done; | |
1468 | qp->r_flags &= ~QIB_R_RDMAR_SEQ; | |
1469 | } | |
1470 | ||
1471 | if (unlikely(qp->s_acked == qp->s_tail)) | |
1472 | goto ack_done; | |
1473 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1474 | status = IB_WC_SUCCESS; | |
1475 | ||
1476 | switch (opcode) { | |
1477 | case OP(ACKNOWLEDGE): | |
1478 | case OP(ATOMIC_ACKNOWLEDGE): | |
1479 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1480 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1481 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) { | |
1482 | __be32 *p = ohdr->u.at.atomic_ack_eth; | |
1483 | ||
1484 | val = ((u64) be32_to_cpu(p[0]) << 32) | | |
1485 | be32_to_cpu(p[1]); | |
1486 | } else | |
1487 | val = 0; | |
1488 | if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || | |
1489 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) | |
1490 | goto ack_done; | |
1491 | hdrsize += 4; | |
1492 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1493 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1494 | goto ack_op_err; | |
1495 | /* | |
1496 | * If this is a response to a resent RDMA read, we | |
1497 | * have to be careful to copy the data to the right | |
1498 | * location. | |
1499 | */ | |
1500 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1501 | wqe, psn, pmtu); | |
1502 | goto read_middle; | |
1503 | ||
1504 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1505 | /* no AETH, no ACK */ | |
1506 | if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1))) | |
1507 | goto ack_seq_err; | |
1508 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1509 | goto ack_op_err; | |
1510 | read_middle: | |
1511 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1512 | goto ack_len_err; | |
1513 | if (unlikely(pmtu >= qp->s_rdma_read_len)) | |
1514 | goto ack_len_err; | |
1515 | ||
1516 | /* | |
1517 | * We got a response so update the timeout. | |
1518 | * 4.096 usec. * (1 << qp->timeout) | |
1519 | */ | |
1520 | qp->s_flags |= QIB_S_TIMER; | |
1521 | mod_timer(&qp->s_timer, jiffies + | |
1522 | usecs_to_jiffies((4096UL * (1UL << qp->timeout)) / | |
1523 | 1000UL)); | |
1524 | if (qp->s_flags & QIB_S_WAIT_ACK) { | |
1525 | qp->s_flags &= ~QIB_S_WAIT_ACK; | |
1526 | qib_schedule_send(qp); | |
1527 | } | |
1528 | ||
1529 | if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) | |
1530 | qp->s_retry = qp->s_retry_cnt; | |
1531 | ||
1532 | /* | |
1533 | * Update the RDMA receive state but do the copy w/o | |
1534 | * holding the locks and blocking interrupts. | |
1535 | */ | |
1536 | qp->s_rdma_read_len -= pmtu; | |
1537 | update_last_psn(qp, psn); | |
1538 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1539 | qib_copy_sge(&qp->s_rdma_read_sge, data, pmtu, 0); | |
1540 | goto bail; | |
1541 | ||
1542 | case OP(RDMA_READ_RESPONSE_ONLY): | |
1543 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1544 | if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) | |
1545 | goto ack_done; | |
1546 | /* Get the number of bytes the message was padded by. */ | |
1547 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1548 | /* | |
1549 | * Check that the data size is >= 0 && <= pmtu. | |
1550 | * Remember to account for the AETH header (4) and | |
1551 | * ICRC (4). | |
1552 | */ | |
1553 | if (unlikely(tlen < (hdrsize + pad + 8))) | |
1554 | goto ack_len_err; | |
1555 | /* | |
1556 | * If this is a response to a resent RDMA read, we | |
1557 | * have to be careful to copy the data to the right | |
1558 | * location. | |
1559 | */ | |
1560 | wqe = get_swqe_ptr(qp, qp->s_acked); | |
1561 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1562 | wqe, psn, pmtu); | |
1563 | goto read_last; | |
1564 | ||
1565 | case OP(RDMA_READ_RESPONSE_LAST): | |
1566 | /* ACKs READ req. */ | |
1567 | if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1))) | |
1568 | goto ack_seq_err; | |
1569 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1570 | goto ack_op_err; | |
1571 | /* Get the number of bytes the message was padded by. */ | |
1572 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1573 | /* | |
1574 | * Check that the data size is >= 1 && <= pmtu. | |
1575 | * Remember to account for the AETH header (4) and | |
1576 | * ICRC (4). | |
1577 | */ | |
1578 | if (unlikely(tlen <= (hdrsize + pad + 8))) | |
1579 | goto ack_len_err; | |
1580 | read_last: | |
1581 | tlen -= hdrsize + pad + 8; | |
1582 | if (unlikely(tlen != qp->s_rdma_read_len)) | |
1583 | goto ack_len_err; | |
1584 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1585 | qib_copy_sge(&qp->s_rdma_read_sge, data, tlen, 0); | |
1586 | WARN_ON(qp->s_rdma_read_sge.num_sge); | |
1587 | (void) do_rc_ack(qp, aeth, psn, | |
1588 | OP(RDMA_READ_RESPONSE_LAST), 0, rcd); | |
1589 | goto ack_done; | |
1590 | } | |
1591 | ||
1592 | ack_op_err: | |
1593 | status = IB_WC_LOC_QP_OP_ERR; | |
1594 | goto ack_err; | |
1595 | ||
1596 | ack_seq_err: | |
1597 | rdma_seq_err(qp, ibp, psn, rcd); | |
1598 | goto ack_done; | |
1599 | ||
1600 | ack_len_err: | |
1601 | status = IB_WC_LOC_LEN_ERR; | |
1602 | ack_err: | |
1603 | if (qp->s_last == qp->s_acked) { | |
1604 | qib_send_complete(qp, wqe, status); | |
1605 | qib_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
1606 | } | |
1607 | ack_done: | |
1608 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1609 | bail: | |
1610 | return; | |
1611 | } | |
1612 | ||
1613 | /** | |
1614 | * qib_rc_rcv_error - process an incoming duplicate or error RC packet | |
1615 | * @ohdr: the other headers for this packet | |
1616 | * @data: the packet data | |
1617 | * @qp: the QP for this packet | |
1618 | * @opcode: the opcode for this packet | |
1619 | * @psn: the packet sequence number for this packet | |
1620 | * @diff: the difference between the PSN and the expected PSN | |
1621 | * | |
1622 | * This is called from qib_rc_rcv() to process an unexpected | |
1623 | * incoming RC packet for the given QP. | |
1624 | * Called at interrupt level. | |
1625 | * Return 1 if no more processing is needed; otherwise return 0 to | |
1626 | * schedule a response to be sent. | |
1627 | */ | |
1628 | static int qib_rc_rcv_error(struct qib_other_headers *ohdr, | |
1629 | void *data, | |
1630 | struct qib_qp *qp, | |
1631 | u32 opcode, | |
1632 | u32 psn, | |
1633 | int diff, | |
1634 | struct qib_ctxtdata *rcd) | |
1635 | { | |
1636 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
1637 | struct qib_ack_entry *e; | |
1638 | unsigned long flags; | |
1639 | u8 i, prev; | |
1640 | int old_req; | |
1641 | ||
1642 | if (diff > 0) { | |
1643 | /* | |
1644 | * Packet sequence error. | |
1645 | * A NAK will ACK earlier sends and RDMA writes. | |
1646 | * Don't queue the NAK if we already sent one. | |
1647 | */ | |
1648 | if (!qp->r_nak_state) { | |
1649 | ibp->n_rc_seqnak++; | |
1650 | qp->r_nak_state = IB_NAK_PSN_ERROR; | |
1651 | /* Use the expected PSN. */ | |
1652 | qp->r_ack_psn = qp->r_psn; | |
1653 | /* | |
1654 | * Wait to send the sequence NAK until all packets | |
1655 | * in the receive queue have been processed. | |
1656 | * Otherwise, we end up propagating congestion. | |
1657 | */ | |
1658 | if (list_empty(&qp->rspwait)) { | |
1659 | qp->r_flags |= QIB_R_RSP_NAK; | |
1660 | atomic_inc(&qp->refcount); | |
1661 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
1662 | } | |
1663 | } | |
1664 | goto done; | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1669 | * write or atomic op. Don't NAK errors, just silently drop | |
1670 | * the duplicate request. Note that r_sge, r_len, and | |
1671 | * r_rcv_len may be in use so don't modify them. | |
1672 | * | |
1673 | * We are supposed to ACK the earliest duplicate PSN but we | |
1674 | * can coalesce an outstanding duplicate ACK. We have to | |
1675 | * send the earliest so that RDMA reads can be restarted at | |
1676 | * the requester's expected PSN. | |
1677 | * | |
1678 | * First, find where this duplicate PSN falls within the | |
1679 | * ACKs previously sent. | |
1680 | * old_req is true if there is an older response that is scheduled | |
1681 | * to be sent before sending this one. | |
1682 | */ | |
1683 | e = NULL; | |
1684 | old_req = 1; | |
1685 | ibp->n_rc_dupreq++; | |
1686 | ||
1687 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
1688 | |
1689 | for (i = qp->r_head_ack_queue; ; i = prev) { | |
1690 | if (i == qp->s_tail_ack_queue) | |
1691 | old_req = 0; | |
1692 | if (i) | |
1693 | prev = i - 1; | |
1694 | else | |
1695 | prev = QIB_MAX_RDMA_ATOMIC; | |
1696 | if (prev == qp->r_head_ack_queue) { | |
1697 | e = NULL; | |
1698 | break; | |
1699 | } | |
1700 | e = &qp->s_ack_queue[prev]; | |
1701 | if (!e->opcode) { | |
1702 | e = NULL; | |
1703 | break; | |
1704 | } | |
1705 | if (qib_cmp24(psn, e->psn) >= 0) { | |
1706 | if (prev == qp->s_tail_ack_queue && | |
1707 | qib_cmp24(psn, e->lpsn) <= 0) | |
1708 | old_req = 0; | |
1709 | break; | |
1710 | } | |
1711 | } | |
1712 | switch (opcode) { | |
1713 | case OP(RDMA_READ_REQUEST): { | |
1714 | struct ib_reth *reth; | |
1715 | u32 offset; | |
1716 | u32 len; | |
1717 | ||
1718 | /* | |
1719 | * If we didn't find the RDMA read request in the ack queue, | |
1720 | * we can ignore this request. | |
1721 | */ | |
1722 | if (!e || e->opcode != OP(RDMA_READ_REQUEST)) | |
1723 | goto unlock_done; | |
1724 | /* RETH comes after BTH */ | |
1725 | reth = &ohdr->u.rc.reth; | |
1726 | /* | |
1727 | * Address range must be a subset of the original | |
1728 | * request and start on pmtu boundaries. | |
1729 | * We reuse the old ack_queue slot since the requester | |
1730 | * should not back up and request an earlier PSN for the | |
1731 | * same request. | |
1732 | */ | |
1733 | offset = ((psn - e->psn) & QIB_PSN_MASK) * | |
1734 | ib_mtu_enum_to_int(qp->path_mtu); | |
1735 | len = be32_to_cpu(reth->length); | |
1736 | if (unlikely(offset + len != e->rdma_sge.sge_length)) | |
1737 | goto unlock_done; | |
1738 | if (e->rdma_sge.mr) { | |
1739 | atomic_dec(&e->rdma_sge.mr->refcount); | |
1740 | e->rdma_sge.mr = NULL; | |
1741 | } | |
1742 | if (len != 0) { | |
1743 | u32 rkey = be32_to_cpu(reth->rkey); | |
1744 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1745 | int ok; | |
1746 | ||
1747 | ok = qib_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, | |
1748 | IB_ACCESS_REMOTE_READ); | |
1749 | if (unlikely(!ok)) | |
1750 | goto unlock_done; | |
1751 | } else { | |
1752 | e->rdma_sge.vaddr = NULL; | |
1753 | e->rdma_sge.length = 0; | |
1754 | e->rdma_sge.sge_length = 0; | |
1755 | } | |
1756 | e->psn = psn; | |
1757 | if (old_req) | |
1758 | goto unlock_done; | |
1759 | qp->s_tail_ack_queue = prev; | |
1760 | break; | |
1761 | } | |
1762 | ||
1763 | case OP(COMPARE_SWAP): | |
1764 | case OP(FETCH_ADD): { | |
1765 | /* | |
1766 | * If we didn't find the atomic request in the ack queue | |
1767 | * or the send tasklet is already backed up to send an | |
1768 | * earlier entry, we can ignore this request. | |
1769 | */ | |
1770 | if (!e || e->opcode != (u8) opcode || old_req) | |
1771 | goto unlock_done; | |
1772 | qp->s_tail_ack_queue = prev; | |
1773 | break; | |
1774 | } | |
1775 | ||
1776 | default: | |
1777 | /* | |
1778 | * Ignore this operation if it doesn't request an ACK | |
1779 | * or an earlier RDMA read or atomic is going to be resent. | |
1780 | */ | |
1781 | if (!(psn & IB_BTH_REQ_ACK) || old_req) | |
1782 | goto unlock_done; | |
1783 | /* | |
1784 | * Resend the most recent ACK if this request is | |
1785 | * after all the previous RDMA reads and atomics. | |
1786 | */ | |
1787 | if (i == qp->r_head_ack_queue) { | |
1788 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1789 | qp->r_nak_state = 0; | |
1790 | qp->r_ack_psn = qp->r_psn - 1; | |
1791 | goto send_ack; | |
1792 | } | |
1793 | /* | |
1794 | * Try to send a simple ACK to work around a Mellanox bug | |
1795 | * which doesn't accept a RDMA read response or atomic | |
1796 | * response as an ACK for earlier SENDs or RDMA writes. | |
1797 | */ | |
1798 | if (!(qp->s_flags & QIB_S_RESP_PENDING)) { | |
1799 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1800 | qp->r_nak_state = 0; | |
1801 | qp->r_ack_psn = qp->s_ack_queue[i].psn - 1; | |
1802 | goto send_ack; | |
1803 | } | |
1804 | /* | |
1805 | * Resend the RDMA read or atomic op which | |
1806 | * ACKs this duplicate request. | |
1807 | */ | |
1808 | qp->s_tail_ack_queue = i; | |
1809 | break; | |
1810 | } | |
1811 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1812 | qp->s_flags |= QIB_S_RESP_PENDING; | |
1813 | qp->r_nak_state = 0; | |
1814 | qib_schedule_send(qp); | |
1815 | ||
1816 | unlock_done: | |
1817 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1818 | done: | |
1819 | return 1; | |
1820 | ||
1821 | send_ack: | |
1822 | return 0; | |
1823 | } | |
1824 | ||
1825 | void qib_rc_error(struct qib_qp *qp, enum ib_wc_status err) | |
1826 | { | |
1827 | unsigned long flags; | |
1828 | int lastwqe; | |
1829 | ||
1830 | spin_lock_irqsave(&qp->s_lock, flags); | |
1831 | lastwqe = qib_error_qp(qp, err); | |
1832 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1833 | ||
1834 | if (lastwqe) { | |
1835 | struct ib_event ev; | |
1836 | ||
1837 | ev.device = qp->ibqp.device; | |
1838 | ev.element.qp = &qp->ibqp; | |
1839 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
1840 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1841 | } | |
1842 | } | |
1843 | ||
1844 | static inline void qib_update_ack_queue(struct qib_qp *qp, unsigned n) | |
1845 | { | |
1846 | unsigned next; | |
1847 | ||
1848 | next = n + 1; | |
1849 | if (next > QIB_MAX_RDMA_ATOMIC) | |
1850 | next = 0; | |
1851 | qp->s_tail_ack_queue = next; | |
1852 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1853 | } | |
1854 | ||
1855 | /** | |
1856 | * qib_rc_rcv - process an incoming RC packet | |
1857 | * @rcd: the context pointer | |
1858 | * @hdr: the header of this packet | |
1859 | * @has_grh: true if the header has a GRH | |
1860 | * @data: the packet data | |
1861 | * @tlen: the packet length | |
1862 | * @qp: the QP for this packet | |
1863 | * | |
1864 | * This is called from qib_qp_rcv() to process an incoming RC packet | |
1865 | * for the given QP. | |
1866 | * Called at interrupt level. | |
1867 | */ | |
1868 | void qib_rc_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr, | |
1869 | int has_grh, void *data, u32 tlen, struct qib_qp *qp) | |
1870 | { | |
1871 | struct qib_ibport *ibp = &rcd->ppd->ibport_data; | |
1872 | struct qib_other_headers *ohdr; | |
1873 | u32 opcode; | |
1874 | u32 hdrsize; | |
1875 | u32 psn; | |
1876 | u32 pad; | |
1877 | struct ib_wc wc; | |
1878 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); | |
1879 | int diff; | |
1880 | struct ib_reth *reth; | |
1881 | unsigned long flags; | |
1882 | int ret; | |
1883 | ||
1884 | /* Check for GRH */ | |
1885 | if (!has_grh) { | |
1886 | ohdr = &hdr->u.oth; | |
1887 | hdrsize = 8 + 12; /* LRH + BTH */ | |
1888 | } else { | |
1889 | ohdr = &hdr->u.l.oth; | |
1890 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
1891 | } | |
1892 | ||
1893 | opcode = be32_to_cpu(ohdr->bth[0]); | |
1894 | spin_lock_irqsave(&qp->s_lock, flags); | |
1895 | if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode)) | |
1896 | goto sunlock; | |
1897 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1898 | ||
1899 | psn = be32_to_cpu(ohdr->bth[2]); | |
1900 | opcode >>= 24; | |
1901 | ||
f931551b RC |
1902 | /* |
1903 | * Process responses (ACKs) before anything else. Note that the | |
1904 | * packet sequence number will be for something in the send work | |
1905 | * queue rather than the expected receive packet sequence number. | |
1906 | * In other words, this QP is the requester. | |
1907 | */ | |
1908 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
1909 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1910 | qib_rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn, | |
1911 | hdrsize, pmtu, rcd); | |
a5210c12 | 1912 | return; |
f931551b RC |
1913 | } |
1914 | ||
1915 | /* Compute 24 bits worth of difference. */ | |
1916 | diff = qib_cmp24(psn, qp->r_psn); | |
1917 | if (unlikely(diff)) { | |
1918 | if (qib_rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) | |
a5210c12 | 1919 | return; |
f931551b RC |
1920 | goto send_ack; |
1921 | } | |
1922 | ||
1923 | /* Check for opcode sequence errors. */ | |
1924 | switch (qp->r_state) { | |
1925 | case OP(SEND_FIRST): | |
1926 | case OP(SEND_MIDDLE): | |
1927 | if (opcode == OP(SEND_MIDDLE) || | |
1928 | opcode == OP(SEND_LAST) || | |
1929 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
1930 | break; | |
1931 | goto nack_inv; | |
1932 | ||
1933 | case OP(RDMA_WRITE_FIRST): | |
1934 | case OP(RDMA_WRITE_MIDDLE): | |
1935 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
1936 | opcode == OP(RDMA_WRITE_LAST) || | |
1937 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1938 | break; | |
1939 | goto nack_inv; | |
1940 | ||
1941 | default: | |
1942 | if (opcode == OP(SEND_MIDDLE) || | |
1943 | opcode == OP(SEND_LAST) || | |
1944 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
1945 | opcode == OP(RDMA_WRITE_MIDDLE) || | |
1946 | opcode == OP(RDMA_WRITE_LAST) || | |
1947 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1948 | goto nack_inv; | |
1949 | /* | |
1950 | * Note that it is up to the requester to not send a new | |
1951 | * RDMA read or atomic operation before receiving an ACK | |
1952 | * for the previous operation. | |
1953 | */ | |
1954 | break; | |
1955 | } | |
1956 | ||
1957 | memset(&wc, 0, sizeof wc); | |
1958 | ||
1959 | if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) { | |
1960 | qp->r_flags |= QIB_R_COMM_EST; | |
1961 | if (qp->ibqp.event_handler) { | |
1962 | struct ib_event ev; | |
1963 | ||
1964 | ev.device = qp->ibqp.device; | |
1965 | ev.element.qp = &qp->ibqp; | |
1966 | ev.event = IB_EVENT_COMM_EST; | |
1967 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1968 | } | |
1969 | } | |
1970 | ||
1971 | /* OK, process the packet. */ | |
1972 | switch (opcode) { | |
1973 | case OP(SEND_FIRST): | |
1974 | ret = qib_get_rwqe(qp, 0); | |
1975 | if (ret < 0) | |
1976 | goto nack_op_err; | |
1977 | if (!ret) | |
1978 | goto rnr_nak; | |
1979 | qp->r_rcv_len = 0; | |
1980 | /* FALLTHROUGH */ | |
1981 | case OP(SEND_MIDDLE): | |
1982 | case OP(RDMA_WRITE_MIDDLE): | |
1983 | send_middle: | |
1984 | /* Check for invalid length PMTU or posted rwqe len. */ | |
1985 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1986 | goto nack_inv; | |
1987 | qp->r_rcv_len += pmtu; | |
1988 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
1989 | goto nack_inv; | |
1990 | qib_copy_sge(&qp->r_sge, data, pmtu, 1); | |
1991 | break; | |
1992 | ||
1993 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
1994 | /* consume RWQE */ | |
1995 | ret = qib_get_rwqe(qp, 1); | |
1996 | if (ret < 0) | |
1997 | goto nack_op_err; | |
1998 | if (!ret) | |
1999 | goto rnr_nak; | |
2000 | goto send_last_imm; | |
2001 | ||
2002 | case OP(SEND_ONLY): | |
2003 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
2004 | ret = qib_get_rwqe(qp, 0); | |
2005 | if (ret < 0) | |
2006 | goto nack_op_err; | |
2007 | if (!ret) | |
2008 | goto rnr_nak; | |
2009 | qp->r_rcv_len = 0; | |
2010 | if (opcode == OP(SEND_ONLY)) | |
2011 | goto send_last; | |
2012 | /* FALLTHROUGH */ | |
2013 | case OP(SEND_LAST_WITH_IMMEDIATE): | |
2014 | send_last_imm: | |
2015 | wc.ex.imm_data = ohdr->u.imm_data; | |
2016 | hdrsize += 4; | |
2017 | wc.wc_flags = IB_WC_WITH_IMM; | |
2018 | /* FALLTHROUGH */ | |
2019 | case OP(SEND_LAST): | |
2020 | case OP(RDMA_WRITE_LAST): | |
2021 | send_last: | |
2022 | /* Get the number of bytes the message was padded by. */ | |
2023 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
2024 | /* Check for invalid length. */ | |
2025 | /* XXX LAST len should be >= 1 */ | |
2026 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
2027 | goto nack_inv; | |
2028 | /* Don't count the CRC. */ | |
2029 | tlen -= (hdrsize + pad + 4); | |
2030 | wc.byte_len = tlen + qp->r_rcv_len; | |
2031 | if (unlikely(wc.byte_len > qp->r_len)) | |
2032 | goto nack_inv; | |
2033 | qib_copy_sge(&qp->r_sge, data, tlen, 1); | |
2034 | while (qp->r_sge.num_sge) { | |
2035 | atomic_dec(&qp->r_sge.sge.mr->refcount); | |
2036 | if (--qp->r_sge.num_sge) | |
2037 | qp->r_sge.sge = *qp->r_sge.sg_list++; | |
2038 | } | |
2039 | qp->r_msn++; | |
2040 | if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) | |
2041 | break; | |
2042 | wc.wr_id = qp->r_wr_id; | |
2043 | wc.status = IB_WC_SUCCESS; | |
2044 | if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || | |
2045 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) | |
2046 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
2047 | else | |
2048 | wc.opcode = IB_WC_RECV; | |
2049 | wc.qp = &qp->ibqp; | |
2050 | wc.src_qp = qp->remote_qpn; | |
2051 | wc.slid = qp->remote_ah_attr.dlid; | |
2052 | wc.sl = qp->remote_ah_attr.sl; | |
2053 | /* Signal completion event if the solicited bit is set. */ | |
2054 | qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
2055 | (ohdr->bth[0] & | |
2056 | cpu_to_be32(IB_BTH_SOLICITED)) != 0); | |
2057 | break; | |
2058 | ||
2059 | case OP(RDMA_WRITE_FIRST): | |
2060 | case OP(RDMA_WRITE_ONLY): | |
2061 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
2062 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
2063 | goto nack_inv; | |
2064 | /* consume RWQE */ | |
2065 | reth = &ohdr->u.rc.reth; | |
2066 | hdrsize += sizeof(*reth); | |
2067 | qp->r_len = be32_to_cpu(reth->length); | |
2068 | qp->r_rcv_len = 0; | |
2069 | qp->r_sge.sg_list = NULL; | |
2070 | if (qp->r_len != 0) { | |
2071 | u32 rkey = be32_to_cpu(reth->rkey); | |
2072 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
2073 | int ok; | |
2074 | ||
2075 | /* Check rkey & NAK */ | |
2076 | ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, | |
2077 | rkey, IB_ACCESS_REMOTE_WRITE); | |
2078 | if (unlikely(!ok)) | |
2079 | goto nack_acc; | |
2080 | qp->r_sge.num_sge = 1; | |
2081 | } else { | |
2082 | qp->r_sge.num_sge = 0; | |
2083 | qp->r_sge.sge.mr = NULL; | |
2084 | qp->r_sge.sge.vaddr = NULL; | |
2085 | qp->r_sge.sge.length = 0; | |
2086 | qp->r_sge.sge.sge_length = 0; | |
2087 | } | |
2088 | if (opcode == OP(RDMA_WRITE_FIRST)) | |
2089 | goto send_middle; | |
2090 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
2091 | goto send_last; | |
2092 | ret = qib_get_rwqe(qp, 1); | |
2093 | if (ret < 0) | |
2094 | goto nack_op_err; | |
2095 | if (!ret) | |
2096 | goto rnr_nak; | |
5715f5d4 JG |
2097 | wc.ex.imm_data = ohdr->u.rc.imm_data; |
2098 | hdrsize += 4; | |
2099 | wc.wc_flags = IB_WC_WITH_IMM; | |
2100 | goto send_last; | |
f931551b RC |
2101 | |
2102 | case OP(RDMA_READ_REQUEST): { | |
2103 | struct qib_ack_entry *e; | |
2104 | u32 len; | |
2105 | u8 next; | |
2106 | ||
2107 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
2108 | goto nack_inv; | |
2109 | next = qp->r_head_ack_queue + 1; | |
2110 | /* s_ack_queue is size QIB_MAX_RDMA_ATOMIC+1 so use > not >= */ | |
2111 | if (next > QIB_MAX_RDMA_ATOMIC) | |
2112 | next = 0; | |
2113 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
2114 | if (unlikely(next == qp->s_tail_ack_queue)) { |
2115 | if (!qp->s_ack_queue[next].sent) | |
2116 | goto nack_inv_unlck; | |
2117 | qib_update_ack_queue(qp, next); | |
2118 | } | |
2119 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2120 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
2121 | atomic_dec(&e->rdma_sge.mr->refcount); | |
2122 | e->rdma_sge.mr = NULL; | |
2123 | } | |
2124 | reth = &ohdr->u.rc.reth; | |
2125 | len = be32_to_cpu(reth->length); | |
2126 | if (len) { | |
2127 | u32 rkey = be32_to_cpu(reth->rkey); | |
2128 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
2129 | int ok; | |
2130 | ||
2131 | /* Check rkey & NAK */ | |
2132 | ok = qib_rkey_ok(qp, &e->rdma_sge, len, vaddr, | |
2133 | rkey, IB_ACCESS_REMOTE_READ); | |
2134 | if (unlikely(!ok)) | |
2135 | goto nack_acc_unlck; | |
2136 | /* | |
2137 | * Update the next expected PSN. We add 1 later | |
2138 | * below, so only add the remainder here. | |
2139 | */ | |
2140 | if (len > pmtu) | |
2141 | qp->r_psn += (len - 1) / pmtu; | |
2142 | } else { | |
2143 | e->rdma_sge.mr = NULL; | |
2144 | e->rdma_sge.vaddr = NULL; | |
2145 | e->rdma_sge.length = 0; | |
2146 | e->rdma_sge.sge_length = 0; | |
2147 | } | |
2148 | e->opcode = opcode; | |
2149 | e->sent = 0; | |
2150 | e->psn = psn; | |
2151 | e->lpsn = qp->r_psn; | |
2152 | /* | |
2153 | * We need to increment the MSN here instead of when we | |
2154 | * finish sending the result since a duplicate request would | |
2155 | * increment it more than once. | |
2156 | */ | |
2157 | qp->r_msn++; | |
2158 | qp->r_psn++; | |
2159 | qp->r_state = opcode; | |
2160 | qp->r_nak_state = 0; | |
2161 | qp->r_head_ack_queue = next; | |
2162 | ||
2163 | /* Schedule the send tasklet. */ | |
2164 | qp->s_flags |= QIB_S_RESP_PENDING; | |
2165 | qib_schedule_send(qp); | |
2166 | ||
a5210c12 | 2167 | goto sunlock; |
f931551b RC |
2168 | } |
2169 | ||
2170 | case OP(COMPARE_SWAP): | |
2171 | case OP(FETCH_ADD): { | |
2172 | struct ib_atomic_eth *ateth; | |
2173 | struct qib_ack_entry *e; | |
2174 | u64 vaddr; | |
2175 | atomic64_t *maddr; | |
2176 | u64 sdata; | |
2177 | u32 rkey; | |
2178 | u8 next; | |
2179 | ||
2180 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) | |
2181 | goto nack_inv; | |
2182 | next = qp->r_head_ack_queue + 1; | |
2183 | if (next > QIB_MAX_RDMA_ATOMIC) | |
2184 | next = 0; | |
2185 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
2186 | if (unlikely(next == qp->s_tail_ack_queue)) { |
2187 | if (!qp->s_ack_queue[next].sent) | |
2188 | goto nack_inv_unlck; | |
2189 | qib_update_ack_queue(qp, next); | |
2190 | } | |
2191 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2192 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
2193 | atomic_dec(&e->rdma_sge.mr->refcount); | |
2194 | e->rdma_sge.mr = NULL; | |
2195 | } | |
2196 | ateth = &ohdr->u.atomic_eth; | |
2197 | vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) | | |
2198 | be32_to_cpu(ateth->vaddr[1]); | |
2199 | if (unlikely(vaddr & (sizeof(u64) - 1))) | |
2200 | goto nack_inv_unlck; | |
2201 | rkey = be32_to_cpu(ateth->rkey); | |
2202 | /* Check rkey & NAK */ | |
2203 | if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), | |
2204 | vaddr, rkey, | |
2205 | IB_ACCESS_REMOTE_ATOMIC))) | |
2206 | goto nack_acc_unlck; | |
2207 | /* Perform atomic OP and save result. */ | |
2208 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; | |
2209 | sdata = be64_to_cpu(ateth->swap_data); | |
2210 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? | |
2211 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
2212 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
2213 | be64_to_cpu(ateth->compare_data), | |
2214 | sdata); | |
2215 | atomic_dec(&qp->r_sge.sge.mr->refcount); | |
2216 | qp->r_sge.num_sge = 0; | |
2217 | e->opcode = opcode; | |
2218 | e->sent = 0; | |
2219 | e->psn = psn; | |
2220 | e->lpsn = psn; | |
2221 | qp->r_msn++; | |
2222 | qp->r_psn++; | |
2223 | qp->r_state = opcode; | |
2224 | qp->r_nak_state = 0; | |
2225 | qp->r_head_ack_queue = next; | |
2226 | ||
2227 | /* Schedule the send tasklet. */ | |
2228 | qp->s_flags |= QIB_S_RESP_PENDING; | |
2229 | qib_schedule_send(qp); | |
2230 | ||
a5210c12 | 2231 | goto sunlock; |
f931551b RC |
2232 | } |
2233 | ||
2234 | default: | |
2235 | /* NAK unknown opcodes. */ | |
2236 | goto nack_inv; | |
2237 | } | |
2238 | qp->r_psn++; | |
2239 | qp->r_state = opcode; | |
2240 | qp->r_ack_psn = psn; | |
2241 | qp->r_nak_state = 0; | |
2242 | /* Send an ACK if requested or required. */ | |
2243 | if (psn & (1 << 31)) | |
2244 | goto send_ack; | |
a5210c12 | 2245 | return; |
f931551b RC |
2246 | |
2247 | rnr_nak: | |
2248 | qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; | |
2249 | qp->r_ack_psn = qp->r_psn; | |
2250 | /* Queue RNR NAK for later */ | |
2251 | if (list_empty(&qp->rspwait)) { | |
2252 | qp->r_flags |= QIB_R_RSP_NAK; | |
2253 | atomic_inc(&qp->refcount); | |
2254 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
2255 | } | |
a5210c12 | 2256 | return; |
f931551b RC |
2257 | |
2258 | nack_op_err: | |
2259 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
2260 | qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; | |
2261 | qp->r_ack_psn = qp->r_psn; | |
2262 | /* Queue NAK for later */ | |
2263 | if (list_empty(&qp->rspwait)) { | |
2264 | qp->r_flags |= QIB_R_RSP_NAK; | |
2265 | atomic_inc(&qp->refcount); | |
2266 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
2267 | } | |
a5210c12 | 2268 | return; |
f931551b RC |
2269 | |
2270 | nack_inv_unlck: | |
2271 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2272 | nack_inv: | |
2273 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
2274 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; | |
2275 | qp->r_ack_psn = qp->r_psn; | |
2276 | /* Queue NAK for later */ | |
2277 | if (list_empty(&qp->rspwait)) { | |
2278 | qp->r_flags |= QIB_R_RSP_NAK; | |
2279 | atomic_inc(&qp->refcount); | |
2280 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); | |
2281 | } | |
a5210c12 | 2282 | return; |
f931551b RC |
2283 | |
2284 | nack_acc_unlck: | |
2285 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2286 | nack_acc: | |
2287 | qib_rc_error(qp, IB_WC_LOC_PROT_ERR); | |
2288 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; | |
2289 | qp->r_ack_psn = qp->r_psn; | |
2290 | send_ack: | |
2291 | qib_send_rc_ack(qp); | |
f931551b RC |
2292 | return; |
2293 | ||
2294 | sunlock: | |
2295 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2296 | } |