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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 | ||
7c2e11fe | 43 | static u32 restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, |
f931551b RC |
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 | ||
7c2e11fe | 57 | static void start_timer(struct rvt_qp *qp) |
f931551b | 58 | { |
01ba79d4 | 59 | qp->s_flags |= RVT_S_TIMER; |
f931551b RC |
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 | */ | |
7c2e11fe | 77 | static int qib_make_rc_ack(struct qib_ibdev *dev, struct rvt_qp *qp, |
261a4351 | 78 | struct ib_other_headers *ohdr, u32 pmtu) |
f931551b | 79 | { |
7c2e11fe | 80 | struct rvt_ack_entry *e; |
f931551b RC |
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. */ | |
db3ef0eb | 87 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) |
f931551b RC |
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) { | |
7c2e11fe | 98 | rvt_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) { | |
01ba79d4 | 115 | if (qp->s_flags & RVT_S_ACK_PENDING) |
f931551b RC |
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) | |
7c2e11fe | 136 | rvt_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); | |
261a4351 | 157 | ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth); |
f931551b RC |
158 | hwords += sizeof(ohdr->u.at) / sizeof(u32); |
159 | bth2 = e->psn & QIB_PSN_MASK; | |
160 | e->sent = 1; | |
161 | } | |
162 | bth0 = qp->s_ack_state << 24; | |
163 | break; | |
164 | ||
165 | case OP(RDMA_READ_RESPONSE_FIRST): | |
166 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
167 | /* FALLTHROUGH */ | |
168 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
169 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
170 | qp->s_rdma_mr = qp->s_ack_rdma_sge.sge.mr; | |
171 | if (qp->s_rdma_mr) | |
7c2e11fe | 172 | rvt_get_mr(qp->s_rdma_mr); |
f931551b RC |
173 | len = qp->s_ack_rdma_sge.sge.sge_length; |
174 | if (len > pmtu) | |
175 | len = pmtu; | |
176 | else { | |
177 | ohdr->u.aeth = qib_compute_aeth(qp); | |
178 | hwords++; | |
179 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
180 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
181 | e->sent = 1; | |
182 | } | |
183 | bth0 = qp->s_ack_state << 24; | |
184 | bth2 = qp->s_ack_rdma_psn++ & QIB_PSN_MASK; | |
185 | break; | |
186 | ||
187 | default: | |
188 | normal: | |
189 | /* | |
190 | * Send a regular ACK. | |
191 | * Set the s_ack_state so we wait until after sending | |
192 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
193 | * (see above). | |
194 | */ | |
195 | qp->s_ack_state = OP(SEND_ONLY); | |
01ba79d4 | 196 | qp->s_flags &= ~RVT_S_ACK_PENDING; |
f931551b RC |
197 | qp->s_cur_sge = NULL; |
198 | if (qp->s_nak_state) | |
199 | ohdr->u.aeth = | |
200 | cpu_to_be32((qp->r_msn & QIB_MSN_MASK) | | |
201 | (qp->s_nak_state << | |
202 | QIB_AETH_CREDIT_SHIFT)); | |
203 | else | |
204 | ohdr->u.aeth = qib_compute_aeth(qp); | |
205 | hwords++; | |
206 | len = 0; | |
207 | bth0 = OP(ACKNOWLEDGE) << 24; | |
208 | bth2 = qp->s_ack_psn & QIB_PSN_MASK; | |
209 | } | |
210 | qp->s_rdma_ack_cnt++; | |
211 | qp->s_hdrwords = hwords; | |
212 | qp->s_cur_size = len; | |
213 | qib_make_ruc_header(qp, ohdr, bth0, bth2); | |
214 | return 1; | |
215 | ||
216 | bail: | |
217 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
01ba79d4 | 218 | qp->s_flags &= ~(RVT_S_RESP_PENDING | RVT_S_ACK_PENDING); |
f931551b RC |
219 | return 0; |
220 | } | |
221 | ||
222 | /** | |
223 | * qib_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
224 | * @qp: a pointer to the QP | |
225 | * | |
46a80d62 MM |
226 | * Assumes the s_lock is held. |
227 | * | |
f931551b RC |
228 | * Return 1 if constructed; otherwise, return 0. |
229 | */ | |
747f4d7a | 230 | int qib_make_rc_req(struct rvt_qp *qp, unsigned long *flags) |
f931551b | 231 | { |
ffc26907 | 232 | struct qib_qp_priv *priv = qp->priv; |
f931551b | 233 | struct qib_ibdev *dev = to_idev(qp->ibqp.device); |
261a4351 | 234 | struct ib_other_headers *ohdr; |
7c2e11fe DD |
235 | struct rvt_sge_state *ss; |
236 | struct rvt_swqe *wqe; | |
f931551b RC |
237 | u32 hwords; |
238 | u32 len; | |
239 | u32 bth0; | |
240 | u32 bth2; | |
cc6ea138 | 241 | u32 pmtu = qp->pmtu; |
f931551b | 242 | char newreq; |
f931551b RC |
243 | int ret = 0; |
244 | int delta; | |
245 | ||
ffc26907 | 246 | ohdr = &priv->s_hdr->u.oth; |
f931551b | 247 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) |
ffc26907 | 248 | ohdr = &priv->s_hdr->u.l.oth; |
f931551b | 249 | |
f931551b | 250 | /* Sending responses has higher priority over sending requests. */ |
01ba79d4 | 251 | if ((qp->s_flags & RVT_S_RESP_PENDING) && |
f931551b RC |
252 | qib_make_rc_ack(dev, qp, ohdr, pmtu)) |
253 | goto done; | |
254 | ||
db3ef0eb HC |
255 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) { |
256 | if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) | |
f931551b RC |
257 | goto bail; |
258 | /* We are in the error state, flush the work request. */ | |
46a80d62 MM |
259 | smp_read_barrier_depends(); /* see post_one_send() */ |
260 | if (qp->s_last == ACCESS_ONCE(qp->s_head)) | |
f931551b RC |
261 | goto bail; |
262 | /* If DMAs are in progress, we can't flush immediately. */ | |
ffc26907 | 263 | if (atomic_read(&priv->s_dma_busy)) { |
01ba79d4 | 264 | qp->s_flags |= RVT_S_WAIT_DMA; |
f931551b RC |
265 | goto bail; |
266 | } | |
db3ef0eb | 267 | wqe = rvt_get_swqe_ptr(qp, qp->s_last); |
30ab7e23 MM |
268 | qib_send_complete(qp, wqe, qp->s_last != qp->s_acked ? |
269 | IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR); | |
270 | /* will get called again */ | |
f931551b RC |
271 | goto done; |
272 | } | |
273 | ||
01ba79d4 | 274 | if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK)) |
f931551b RC |
275 | goto bail; |
276 | ||
277 | if (qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) { | |
278 | if (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { | |
01ba79d4 | 279 | qp->s_flags |= RVT_S_WAIT_PSN; |
f931551b RC |
280 | goto bail; |
281 | } | |
282 | qp->s_sending_psn = qp->s_psn; | |
283 | qp->s_sending_hpsn = qp->s_psn - 1; | |
284 | } | |
285 | ||
286 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
287 | hwords = 5; | |
288 | bth0 = 0; | |
289 | ||
290 | /* Send a request. */ | |
db3ef0eb | 291 | wqe = rvt_get_swqe_ptr(qp, qp->s_cur); |
f931551b RC |
292 | switch (qp->s_state) { |
293 | default: | |
db3ef0eb | 294 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) |
f931551b RC |
295 | goto bail; |
296 | /* | |
297 | * Resend an old request or start a new one. | |
298 | * | |
299 | * We keep track of the current SWQE so that | |
300 | * we don't reset the "furthest progress" state | |
301 | * if we need to back up. | |
302 | */ | |
303 | newreq = 0; | |
304 | if (qp->s_cur == qp->s_tail) { | |
305 | /* Check if send work queue is empty. */ | |
306 | if (qp->s_tail == qp->s_head) | |
307 | goto bail; | |
308 | /* | |
309 | * If a fence is requested, wait for previous | |
310 | * RDMA read and atomic operations to finish. | |
311 | */ | |
312 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
313 | qp->s_num_rd_atomic) { | |
01ba79d4 | 314 | qp->s_flags |= RVT_S_WAIT_FENCE; |
f931551b RC |
315 | goto bail; |
316 | } | |
f931551b | 317 | newreq = 1; |
46a80d62 | 318 | qp->s_psn = wqe->psn; |
f931551b RC |
319 | } |
320 | /* | |
321 | * Note that we have to be careful not to modify the | |
322 | * original work request since we may need to resend | |
323 | * it. | |
324 | */ | |
325 | len = wqe->length; | |
326 | ss = &qp->s_sge; | |
327 | bth2 = qp->s_psn & QIB_PSN_MASK; | |
328 | switch (wqe->wr.opcode) { | |
329 | case IB_WR_SEND: | |
330 | case IB_WR_SEND_WITH_IMM: | |
331 | /* If no credit, return. */ | |
01ba79d4 | 332 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && |
f931551b | 333 | qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { |
01ba79d4 | 334 | qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; |
f931551b RC |
335 | goto bail; |
336 | } | |
f931551b | 337 | if (len > pmtu) { |
f931551b RC |
338 | qp->s_state = OP(SEND_FIRST); |
339 | len = pmtu; | |
340 | break; | |
341 | } | |
342 | if (wqe->wr.opcode == IB_WR_SEND) | |
343 | qp->s_state = OP(SEND_ONLY); | |
344 | else { | |
345 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); | |
346 | /* Immediate data comes after the BTH */ | |
347 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
348 | hwords += 1; | |
349 | } | |
350 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
351 | bth0 |= IB_BTH_SOLICITED; | |
352 | bth2 |= IB_BTH_REQ_ACK; | |
353 | if (++qp->s_cur == qp->s_size) | |
354 | qp->s_cur = 0; | |
355 | break; | |
356 | ||
357 | case IB_WR_RDMA_WRITE: | |
01ba79d4 | 358 | if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) |
f931551b RC |
359 | qp->s_lsn++; |
360 | /* FALLTHROUGH */ | |
361 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
362 | /* If no credit, return. */ | |
01ba79d4 | 363 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && |
f931551b | 364 | qib_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { |
01ba79d4 | 365 | qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; |
f931551b RC |
366 | goto bail; |
367 | } | |
e622f2f4 | 368 | |
f931551b | 369 | ohdr->u.rc.reth.vaddr = |
e622f2f4 | 370 | cpu_to_be64(wqe->rdma_wr.remote_addr); |
f931551b | 371 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 372 | cpu_to_be32(wqe->rdma_wr.rkey); |
f931551b RC |
373 | ohdr->u.rc.reth.length = cpu_to_be32(len); |
374 | hwords += sizeof(struct ib_reth) / sizeof(u32); | |
f931551b | 375 | if (len > pmtu) { |
f931551b RC |
376 | qp->s_state = OP(RDMA_WRITE_FIRST); |
377 | len = pmtu; | |
378 | break; | |
379 | } | |
e622f2f4 | 380 | if (wqe->rdma_wr.wr.opcode == IB_WR_RDMA_WRITE) |
f931551b RC |
381 | qp->s_state = OP(RDMA_WRITE_ONLY); |
382 | else { | |
e622f2f4 | 383 | qp->s_state = OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); |
f931551b | 384 | /* Immediate data comes after RETH */ |
e622f2f4 CH |
385 | ohdr->u.rc.imm_data = |
386 | wqe->rdma_wr.wr.ex.imm_data; | |
f931551b | 387 | hwords += 1; |
e622f2f4 | 388 | if (wqe->rdma_wr.wr.send_flags & IB_SEND_SOLICITED) |
f931551b RC |
389 | bth0 |= IB_BTH_SOLICITED; |
390 | } | |
391 | bth2 |= IB_BTH_REQ_ACK; | |
392 | if (++qp->s_cur == qp->s_size) | |
393 | qp->s_cur = 0; | |
394 | break; | |
395 | ||
396 | case IB_WR_RDMA_READ: | |
397 | /* | |
398 | * Don't allow more operations to be started | |
399 | * than the QP limits allow. | |
400 | */ | |
401 | if (newreq) { | |
402 | if (qp->s_num_rd_atomic >= | |
403 | qp->s_max_rd_atomic) { | |
01ba79d4 | 404 | qp->s_flags |= RVT_S_WAIT_RDMAR; |
f931551b RC |
405 | goto bail; |
406 | } | |
407 | qp->s_num_rd_atomic++; | |
01ba79d4 | 408 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) |
f931551b | 409 | qp->s_lsn++; |
f931551b | 410 | } |
e622f2f4 | 411 | |
f931551b | 412 | ohdr->u.rc.reth.vaddr = |
e622f2f4 | 413 | cpu_to_be64(wqe->rdma_wr.remote_addr); |
f931551b | 414 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 415 | cpu_to_be32(wqe->rdma_wr.rkey); |
f931551b RC |
416 | ohdr->u.rc.reth.length = cpu_to_be32(len); |
417 | qp->s_state = OP(RDMA_READ_REQUEST); | |
418 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
419 | ss = NULL; | |
420 | len = 0; | |
421 | bth2 |= IB_BTH_REQ_ACK; | |
422 | if (++qp->s_cur == qp->s_size) | |
423 | qp->s_cur = 0; | |
424 | break; | |
425 | ||
426 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
427 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
428 | /* | |
429 | * Don't allow more operations to be started | |
430 | * than the QP limits allow. | |
431 | */ | |
432 | if (newreq) { | |
433 | if (qp->s_num_rd_atomic >= | |
434 | qp->s_max_rd_atomic) { | |
01ba79d4 | 435 | qp->s_flags |= RVT_S_WAIT_RDMAR; |
f931551b RC |
436 | goto bail; |
437 | } | |
438 | qp->s_num_rd_atomic++; | |
01ba79d4 | 439 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) |
f931551b | 440 | qp->s_lsn++; |
f931551b | 441 | } |
e622f2f4 | 442 | if (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { |
f931551b | 443 | qp->s_state = OP(COMPARE_SWAP); |
261a4351 MM |
444 | put_ib_ateth_swap(wqe->atomic_wr.swap, |
445 | &ohdr->u.atomic_eth); | |
446 | put_ib_ateth_swap(wqe->atomic_wr.compare_add, | |
447 | &ohdr->u.atomic_eth); | |
f931551b RC |
448 | } else { |
449 | qp->s_state = OP(FETCH_ADD); | |
261a4351 MM |
450 | put_ib_ateth_swap(wqe->atomic_wr.compare_add, |
451 | &ohdr->u.atomic_eth); | |
452 | put_ib_ateth_swap(0, &ohdr->u.atomic_eth); | |
f931551b | 453 | } |
261a4351 MM |
454 | put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr, |
455 | &ohdr->u.atomic_eth); | |
f931551b | 456 | ohdr->u.atomic_eth.rkey = cpu_to_be32( |
e622f2f4 | 457 | wqe->atomic_wr.rkey); |
f931551b RC |
458 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); |
459 | ss = NULL; | |
460 | len = 0; | |
461 | bth2 |= IB_BTH_REQ_ACK; | |
462 | if (++qp->s_cur == qp->s_size) | |
463 | qp->s_cur = 0; | |
464 | break; | |
465 | ||
466 | default: | |
467 | goto bail; | |
468 | } | |
469 | qp->s_sge.sge = wqe->sg_list[0]; | |
470 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
471 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
472 | qp->s_sge.total_len = wqe->length; | |
473 | qp->s_len = wqe->length; | |
474 | if (newreq) { | |
475 | qp->s_tail++; | |
476 | if (qp->s_tail >= qp->s_size) | |
477 | qp->s_tail = 0; | |
478 | } | |
479 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
480 | qp->s_psn = wqe->lpsn + 1; | |
46a80d62 | 481 | else |
f931551b | 482 | qp->s_psn++; |
f931551b RC |
483 | break; |
484 | ||
485 | case OP(RDMA_READ_RESPONSE_FIRST): | |
486 | /* | |
487 | * qp->s_state is normally set to the opcode of the | |
488 | * last packet constructed for new requests and therefore | |
489 | * is never set to RDMA read response. | |
490 | * RDMA_READ_RESPONSE_FIRST is used by the ACK processing | |
491 | * thread to indicate a SEND needs to be restarted from an | |
492 | * earlier PSN without interferring with the sending thread. | |
493 | * See qib_restart_rc(). | |
494 | */ | |
495 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
496 | /* FALLTHROUGH */ | |
497 | case OP(SEND_FIRST): | |
498 | qp->s_state = OP(SEND_MIDDLE); | |
499 | /* FALLTHROUGH */ | |
500 | case OP(SEND_MIDDLE): | |
501 | bth2 = qp->s_psn++ & QIB_PSN_MASK; | |
f931551b RC |
502 | ss = &qp->s_sge; |
503 | len = qp->s_len; | |
504 | if (len > pmtu) { | |
505 | len = pmtu; | |
506 | break; | |
507 | } | |
508 | if (wqe->wr.opcode == IB_WR_SEND) | |
509 | qp->s_state = OP(SEND_LAST); | |
510 | else { | |
511 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
512 | /* Immediate data comes after the BTH */ | |
513 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
514 | hwords += 1; | |
515 | } | |
516 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
517 | bth0 |= IB_BTH_SOLICITED; | |
518 | bth2 |= IB_BTH_REQ_ACK; | |
519 | qp->s_cur++; | |
520 | if (qp->s_cur >= qp->s_size) | |
521 | qp->s_cur = 0; | |
522 | break; | |
523 | ||
524 | case OP(RDMA_READ_RESPONSE_LAST): | |
525 | /* | |
526 | * qp->s_state is normally set to the opcode of the | |
527 | * last packet constructed for new requests and therefore | |
528 | * is never set to RDMA read response. | |
529 | * RDMA_READ_RESPONSE_LAST is used by the ACK processing | |
530 | * thread to indicate a RDMA write needs to be restarted from | |
531 | * an earlier PSN without interferring with the sending thread. | |
532 | * See qib_restart_rc(). | |
533 | */ | |
534 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
535 | /* FALLTHROUGH */ | |
536 | case OP(RDMA_WRITE_FIRST): | |
537 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
538 | /* FALLTHROUGH */ | |
539 | case OP(RDMA_WRITE_MIDDLE): | |
540 | bth2 = qp->s_psn++ & QIB_PSN_MASK; | |
f931551b RC |
541 | ss = &qp->s_sge; |
542 | len = qp->s_len; | |
543 | if (len > pmtu) { | |
544 | len = pmtu; | |
545 | break; | |
546 | } | |
547 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
548 | qp->s_state = OP(RDMA_WRITE_LAST); | |
549 | else { | |
550 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
551 | /* Immediate data comes after the BTH */ | |
552 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
553 | hwords += 1; | |
554 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
555 | bth0 |= IB_BTH_SOLICITED; | |
556 | } | |
557 | bth2 |= IB_BTH_REQ_ACK; | |
558 | qp->s_cur++; | |
559 | if (qp->s_cur >= qp->s_size) | |
560 | qp->s_cur = 0; | |
561 | break; | |
562 | ||
563 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
564 | /* | |
565 | * qp->s_state is normally set to the opcode of the | |
566 | * last packet constructed for new requests and therefore | |
567 | * is never set to RDMA read response. | |
568 | * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing | |
569 | * thread to indicate a RDMA read needs to be restarted from | |
570 | * an earlier PSN without interferring with the sending thread. | |
571 | * See qib_restart_rc(). | |
572 | */ | |
573 | len = ((qp->s_psn - wqe->psn) & QIB_PSN_MASK) * pmtu; | |
574 | ohdr->u.rc.reth.vaddr = | |
e622f2f4 | 575 | cpu_to_be64(wqe->rdma_wr.remote_addr + len); |
f931551b | 576 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 577 | cpu_to_be32(wqe->rdma_wr.rkey); |
f931551b RC |
578 | ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len); |
579 | qp->s_state = OP(RDMA_READ_REQUEST); | |
580 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
581 | bth2 = (qp->s_psn & QIB_PSN_MASK) | IB_BTH_REQ_ACK; | |
582 | qp->s_psn = wqe->lpsn + 1; | |
583 | ss = NULL; | |
584 | len = 0; | |
585 | qp->s_cur++; | |
586 | if (qp->s_cur == qp->s_size) | |
587 | qp->s_cur = 0; | |
588 | break; | |
589 | } | |
590 | qp->s_sending_hpsn = bth2; | |
591 | delta = (((int) bth2 - (int) wqe->psn) << 8) >> 8; | |
592 | if (delta && delta % QIB_PSN_CREDIT == 0) | |
593 | bth2 |= IB_BTH_REQ_ACK; | |
01ba79d4 HC |
594 | if (qp->s_flags & RVT_S_SEND_ONE) { |
595 | qp->s_flags &= ~RVT_S_SEND_ONE; | |
596 | qp->s_flags |= RVT_S_WAIT_ACK; | |
f931551b RC |
597 | bth2 |= IB_BTH_REQ_ACK; |
598 | } | |
599 | qp->s_len -= len; | |
600 | qp->s_hdrwords = hwords; | |
601 | qp->s_cur_sge = ss; | |
602 | qp->s_cur_size = len; | |
603 | qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), bth2); | |
604 | done: | |
46a80d62 | 605 | return 1; |
f931551b | 606 | bail: |
01ba79d4 | 607 | qp->s_flags &= ~RVT_S_BUSY; |
f931551b RC |
608 | return ret; |
609 | } | |
610 | ||
611 | /** | |
612 | * qib_send_rc_ack - Construct an ACK packet and send it | |
613 | * @qp: a pointer to the QP | |
614 | * | |
615 | * This is called from qib_rc_rcv() and qib_kreceive(). | |
616 | * Note that RDMA reads and atomics are handled in the | |
617 | * send side QP state and tasklet. | |
618 | */ | |
7c2e11fe | 619 | void qib_send_rc_ack(struct rvt_qp *qp) |
f931551b RC |
620 | { |
621 | struct qib_devdata *dd = dd_from_ibdev(qp->ibqp.device); | |
622 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
623 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); | |
624 | u64 pbc; | |
625 | u16 lrh0; | |
626 | u32 bth0; | |
627 | u32 hwords; | |
628 | u32 pbufn; | |
629 | u32 __iomem *piobuf; | |
261a4351 MM |
630 | struct ib_header hdr; |
631 | struct ib_other_headers *ohdr; | |
f931551b RC |
632 | u32 control; |
633 | unsigned long flags; | |
634 | ||
635 | spin_lock_irqsave(&qp->s_lock, flags); | |
636 | ||
db3ef0eb | 637 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) |
f931551b RC |
638 | goto unlock; |
639 | ||
640 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ | |
01ba79d4 | 641 | if ((qp->s_flags & RVT_S_RESP_PENDING) || qp->s_rdma_ack_cnt) |
f931551b RC |
642 | goto queue_ack; |
643 | ||
644 | /* Construct the header with s_lock held so APM doesn't change it. */ | |
645 | ohdr = &hdr.u.oth; | |
646 | lrh0 = QIB_LRH_BTH; | |
647 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ | |
648 | hwords = 6; | |
649 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { | |
650 | hwords += qib_make_grh(ibp, &hdr.u.l.grh, | |
651 | &qp->remote_ah_attr.grh, hwords, 0); | |
652 | ohdr = &hdr.u.l.oth; | |
653 | lrh0 = QIB_LRH_GRH; | |
654 | } | |
655 | /* read pkey_index w/o lock (its atomic) */ | |
656 | bth0 = qib_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24); | |
657 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
658 | bth0 |= IB_BTH_MIG_REQ; | |
659 | if (qp->r_nak_state) | |
660 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & QIB_MSN_MASK) | | |
661 | (qp->r_nak_state << | |
662 | QIB_AETH_CREDIT_SHIFT)); | |
663 | else | |
664 | ohdr->u.aeth = qib_compute_aeth(qp); | |
665 | lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | | |
666 | qp->remote_ah_attr.sl << 4; | |
667 | hdr.lrh[0] = cpu_to_be16(lrh0); | |
668 | hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
669 | hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); | |
670 | hdr.lrh[3] = cpu_to_be16(ppd->lid | qp->remote_ah_attr.src_path_bits); | |
671 | ohdr->bth[0] = cpu_to_be32(bth0); | |
672 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
673 | ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & QIB_PSN_MASK); | |
674 | ||
675 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
676 | ||
677 | /* Don't try to send ACKs if the link isn't ACTIVE */ | |
678 | if (!(ppd->lflags & QIBL_LINKACTIVE)) | |
679 | goto done; | |
680 | ||
681 | control = dd->f_setpbc_control(ppd, hwords + SIZE_OF_CRC, | |
682 | qp->s_srate, lrh0 >> 12); | |
683 | /* length is + 1 for the control dword */ | |
684 | pbc = ((u64) control << 32) | (hwords + 1); | |
685 | ||
686 | piobuf = dd->f_getsendbuf(ppd, pbc, &pbufn); | |
687 | if (!piobuf) { | |
688 | /* | |
689 | * We are out of PIO buffers at the moment. | |
690 | * Pass responsibility for sending the ACK to the | |
691 | * send tasklet so that when a PIO buffer becomes | |
692 | * available, the ACK is sent ahead of other outgoing | |
693 | * packets. | |
694 | */ | |
695 | spin_lock_irqsave(&qp->s_lock, flags); | |
696 | goto queue_ack; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Write the pbc. | |
701 | * We have to flush after the PBC for correctness | |
702 | * on some cpus or WC buffer can be written out of order. | |
703 | */ | |
704 | writeq(pbc, piobuf); | |
705 | ||
706 | if (dd->flags & QIB_PIO_FLUSH_WC) { | |
707 | u32 *hdrp = (u32 *) &hdr; | |
708 | ||
709 | qib_flush_wc(); | |
710 | qib_pio_copy(piobuf + 2, hdrp, hwords - 1); | |
711 | qib_flush_wc(); | |
712 | __raw_writel(hdrp[hwords - 1], piobuf + hwords + 1); | |
713 | } else | |
714 | qib_pio_copy(piobuf + 2, (u32 *) &hdr, hwords); | |
715 | ||
716 | if (dd->flags & QIB_USE_SPCL_TRIG) { | |
717 | u32 spcl_off = (pbufn >= dd->piobcnt2k) ? 2047 : 1023; | |
718 | ||
719 | qib_flush_wc(); | |
720 | __raw_writel(0xaebecede, piobuf + spcl_off); | |
721 | } | |
722 | ||
723 | qib_flush_wc(); | |
724 | qib_sendbuf_done(dd, pbufn); | |
725 | ||
7d7632ad | 726 | this_cpu_inc(ibp->pmastats->n_unicast_xmit); |
f931551b RC |
727 | goto done; |
728 | ||
729 | queue_ack: | |
db3ef0eb | 730 | if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) { |
f24a6d48 | 731 | this_cpu_inc(*ibp->rvp.rc_qacks); |
01ba79d4 | 732 | qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING; |
f931551b RC |
733 | qp->s_nak_state = qp->r_nak_state; |
734 | qp->s_ack_psn = qp->r_ack_psn; | |
735 | ||
736 | /* Schedule the send tasklet. */ | |
737 | qib_schedule_send(qp); | |
738 | } | |
739 | unlock: | |
740 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
741 | done: | |
742 | return; | |
743 | } | |
744 | ||
745 | /** | |
746 | * reset_psn - reset the QP state to send starting from PSN | |
747 | * @qp: the QP | |
748 | * @psn: the packet sequence number to restart at | |
749 | * | |
750 | * This is called from qib_rc_rcv() to process an incoming RC ACK | |
751 | * for the given QP. | |
752 | * Called at interrupt level with the QP s_lock held. | |
753 | */ | |
7c2e11fe | 754 | static void reset_psn(struct rvt_qp *qp, u32 psn) |
f931551b RC |
755 | { |
756 | u32 n = qp->s_acked; | |
db3ef0eb | 757 | struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n); |
f931551b RC |
758 | u32 opcode; |
759 | ||
760 | qp->s_cur = n; | |
761 | ||
762 | /* | |
763 | * If we are starting the request from the beginning, | |
764 | * let the normal send code handle initialization. | |
765 | */ | |
766 | if (qib_cmp24(psn, wqe->psn) <= 0) { | |
767 | qp->s_state = OP(SEND_LAST); | |
768 | goto done; | |
769 | } | |
770 | ||
771 | /* Find the work request opcode corresponding to the given PSN. */ | |
772 | opcode = wqe->wr.opcode; | |
773 | for (;;) { | |
774 | int diff; | |
775 | ||
776 | if (++n == qp->s_size) | |
777 | n = 0; | |
778 | if (n == qp->s_tail) | |
779 | break; | |
db3ef0eb | 780 | wqe = rvt_get_swqe_ptr(qp, n); |
f931551b RC |
781 | diff = qib_cmp24(psn, wqe->psn); |
782 | if (diff < 0) | |
783 | break; | |
784 | qp->s_cur = n; | |
785 | /* | |
786 | * If we are starting the request from the beginning, | |
787 | * let the normal send code handle initialization. | |
788 | */ | |
789 | if (diff == 0) { | |
790 | qp->s_state = OP(SEND_LAST); | |
791 | goto done; | |
792 | } | |
793 | opcode = wqe->wr.opcode; | |
794 | } | |
795 | ||
796 | /* | |
797 | * Set the state to restart in the middle of a request. | |
798 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
799 | * See qib_make_rc_req(). | |
800 | */ | |
801 | switch (opcode) { | |
802 | case IB_WR_SEND: | |
803 | case IB_WR_SEND_WITH_IMM: | |
804 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
805 | break; | |
806 | ||
807 | case IB_WR_RDMA_WRITE: | |
808 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
809 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
810 | break; | |
811 | ||
812 | case IB_WR_RDMA_READ: | |
813 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
814 | break; | |
815 | ||
816 | default: | |
817 | /* | |
818 | * This case shouldn't happen since its only | |
819 | * one PSN per req. | |
820 | */ | |
821 | qp->s_state = OP(SEND_LAST); | |
822 | } | |
823 | done: | |
824 | qp->s_psn = psn; | |
825 | /* | |
01ba79d4 | 826 | * Set RVT_S_WAIT_PSN as qib_rc_complete() may start the timer |
f931551b RC |
827 | * asynchronously before the send tasklet can get scheduled. |
828 | * Doing it in qib_make_rc_req() is too late. | |
829 | */ | |
830 | if ((qib_cmp24(qp->s_psn, qp->s_sending_hpsn) <= 0) && | |
831 | (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) | |
01ba79d4 | 832 | qp->s_flags |= RVT_S_WAIT_PSN; |
f931551b RC |
833 | } |
834 | ||
835 | /* | |
836 | * Back up requester to resend the last un-ACKed request. | |
a5210c12 | 837 | * The QP r_lock and s_lock should be held and interrupts disabled. |
f931551b | 838 | */ |
7c2e11fe | 839 | static void qib_restart_rc(struct rvt_qp *qp, u32 psn, int wait) |
f931551b | 840 | { |
db3ef0eb | 841 | struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
842 | struct qib_ibport *ibp; |
843 | ||
844 | if (qp->s_retry == 0) { | |
845 | if (qp->s_mig_state == IB_MIG_ARMED) { | |
846 | qib_migrate_qp(qp); | |
847 | qp->s_retry = qp->s_retry_cnt; | |
848 | } else if (qp->s_last == qp->s_acked) { | |
849 | qib_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); | |
70696ea7 | 850 | rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); |
f931551b RC |
851 | return; |
852 | } else /* XXX need to handle delayed completion */ | |
853 | return; | |
854 | } else | |
855 | qp->s_retry--; | |
856 | ||
857 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
858 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
f24a6d48 | 859 | ibp->rvp.n_rc_resends++; |
f931551b | 860 | else |
f24a6d48 | 861 | ibp->rvp.n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK; |
f931551b | 862 | |
01ba79d4 HC |
863 | qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | |
864 | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN | | |
865 | RVT_S_WAIT_ACK); | |
f931551b | 866 | if (wait) |
01ba79d4 | 867 | qp->s_flags |= RVT_S_SEND_ONE; |
f931551b RC |
868 | reset_psn(qp, psn); |
869 | } | |
870 | ||
871 | /* | |
872 | * This is called from s_timer for missing responses. | |
873 | */ | |
874 | static void rc_timeout(unsigned long arg) | |
875 | { | |
7c2e11fe | 876 | struct rvt_qp *qp = (struct rvt_qp *)arg; |
f931551b RC |
877 | struct qib_ibport *ibp; |
878 | unsigned long flags; | |
879 | ||
a5210c12 RC |
880 | spin_lock_irqsave(&qp->r_lock, flags); |
881 | spin_lock(&qp->s_lock); | |
01ba79d4 | 882 | if (qp->s_flags & RVT_S_TIMER) { |
f931551b | 883 | ibp = to_iport(qp->ibqp.device, qp->port_num); |
f24a6d48 | 884 | ibp->rvp.n_rc_timeouts++; |
01ba79d4 | 885 | qp->s_flags &= ~RVT_S_TIMER; |
f931551b RC |
886 | del_timer(&qp->s_timer); |
887 | qib_restart_rc(qp, qp->s_last_psn + 1, 1); | |
888 | qib_schedule_send(qp); | |
889 | } | |
a5210c12 RC |
890 | spin_unlock(&qp->s_lock); |
891 | spin_unlock_irqrestore(&qp->r_lock, flags); | |
f931551b RC |
892 | } |
893 | ||
894 | /* | |
895 | * This is called from s_timer for RNR timeouts. | |
896 | */ | |
897 | void qib_rc_rnr_retry(unsigned long arg) | |
898 | { | |
7c2e11fe | 899 | struct rvt_qp *qp = (struct rvt_qp *)arg; |
f931551b RC |
900 | unsigned long flags; |
901 | ||
902 | spin_lock_irqsave(&qp->s_lock, flags); | |
01ba79d4 HC |
903 | if (qp->s_flags & RVT_S_WAIT_RNR) { |
904 | qp->s_flags &= ~RVT_S_WAIT_RNR; | |
f931551b RC |
905 | del_timer(&qp->s_timer); |
906 | qib_schedule_send(qp); | |
907 | } | |
908 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
909 | } | |
910 | ||
911 | /* | |
912 | * Set qp->s_sending_psn to the next PSN after the given one. | |
913 | * This would be psn+1 except when RDMA reads are present. | |
914 | */ | |
7c2e11fe | 915 | static void reset_sending_psn(struct rvt_qp *qp, u32 psn) |
f931551b | 916 | { |
7c2e11fe | 917 | struct rvt_swqe *wqe; |
f931551b RC |
918 | u32 n = qp->s_last; |
919 | ||
920 | /* Find the work request corresponding to the given PSN. */ | |
921 | for (;;) { | |
db3ef0eb | 922 | wqe = rvt_get_swqe_ptr(qp, n); |
f931551b RC |
923 | if (qib_cmp24(psn, wqe->lpsn) <= 0) { |
924 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
925 | qp->s_sending_psn = wqe->lpsn + 1; | |
926 | else | |
927 | qp->s_sending_psn = psn + 1; | |
928 | break; | |
929 | } | |
930 | if (++n == qp->s_size) | |
931 | n = 0; | |
932 | if (n == qp->s_tail) | |
933 | break; | |
934 | } | |
935 | } | |
936 | ||
937 | /* | |
938 | * This should be called with the QP s_lock held and interrupts disabled. | |
939 | */ | |
261a4351 | 940 | void qib_rc_send_complete(struct rvt_qp *qp, struct ib_header *hdr) |
f931551b | 941 | { |
261a4351 | 942 | struct ib_other_headers *ohdr; |
7c2e11fe | 943 | struct rvt_swqe *wqe; |
f931551b RC |
944 | u32 opcode; |
945 | u32 psn; | |
946 | ||
db3ef0eb | 947 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) |
f931551b RC |
948 | return; |
949 | ||
950 | /* Find out where the BTH is */ | |
951 | if ((be16_to_cpu(hdr->lrh[0]) & 3) == QIB_LRH_BTH) | |
952 | ohdr = &hdr->u.oth; | |
953 | else | |
954 | ohdr = &hdr->u.l.oth; | |
955 | ||
956 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; | |
957 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
958 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
959 | WARN_ON(!qp->s_rdma_ack_cnt); | |
960 | qp->s_rdma_ack_cnt--; | |
961 | return; | |
962 | } | |
963 | ||
964 | psn = be32_to_cpu(ohdr->bth[2]); | |
965 | reset_sending_psn(qp, psn); | |
966 | ||
967 | /* | |
968 | * Start timer after a packet requesting an ACK has been sent and | |
969 | * there are still requests that haven't been acked. | |
970 | */ | |
971 | if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail && | |
01ba79d4 | 972 | !(qp->s_flags & (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) && |
db3ef0eb | 973 | (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) |
f931551b RC |
974 | start_timer(qp); |
975 | ||
976 | while (qp->s_last != qp->s_acked) { | |
ee84541a MM |
977 | u32 s_last; |
978 | ||
db3ef0eb | 979 | wqe = rvt_get_swqe_ptr(qp, qp->s_last); |
f931551b RC |
980 | if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) >= 0 && |
981 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) | |
982 | break; | |
ee84541a MM |
983 | s_last = qp->s_last; |
984 | if (++s_last >= qp->s_size) | |
985 | s_last = 0; | |
986 | qp->s_last = s_last; | |
987 | /* see post_send() */ | |
988 | barrier(); | |
c64607aa | 989 | rvt_put_swqe(wqe); |
0771da5a | 990 | rvt_qp_swqe_complete(qp, wqe, IB_WC_SUCCESS); |
f931551b RC |
991 | } |
992 | /* | |
993 | * If we were waiting for sends to complete before resending, | |
994 | * and they are now complete, restart sending. | |
995 | */ | |
01ba79d4 | 996 | if (qp->s_flags & RVT_S_WAIT_PSN && |
f931551b | 997 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { |
01ba79d4 | 998 | qp->s_flags &= ~RVT_S_WAIT_PSN; |
f931551b RC |
999 | qp->s_sending_psn = qp->s_psn; |
1000 | qp->s_sending_hpsn = qp->s_psn - 1; | |
1001 | qib_schedule_send(qp); | |
1002 | } | |
1003 | } | |
1004 | ||
7c2e11fe | 1005 | static inline void update_last_psn(struct rvt_qp *qp, u32 psn) |
f931551b RC |
1006 | { |
1007 | qp->s_last_psn = psn; | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Generate a SWQE completion. | |
1012 | * This is similar to qib_send_complete but has to check to be sure | |
1013 | * that the SGEs are not being referenced if the SWQE is being resent. | |
1014 | */ | |
7c2e11fe DD |
1015 | static struct rvt_swqe *do_rc_completion(struct rvt_qp *qp, |
1016 | struct rvt_swqe *wqe, | |
f931551b RC |
1017 | struct qib_ibport *ibp) |
1018 | { | |
f931551b RC |
1019 | /* |
1020 | * Don't decrement refcount and don't generate a | |
1021 | * completion if the SWQE is being resent until the send | |
1022 | * is finished. | |
1023 | */ | |
1024 | if (qib_cmp24(wqe->lpsn, qp->s_sending_psn) < 0 || | |
1025 | qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { | |
ee84541a MM |
1026 | u32 s_last; |
1027 | ||
c64607aa | 1028 | rvt_put_swqe(wqe); |
ee84541a MM |
1029 | s_last = qp->s_last; |
1030 | if (++s_last >= qp->s_size) | |
1031 | s_last = 0; | |
1032 | qp->s_last = s_last; | |
1033 | /* see post_send() */ | |
1034 | barrier(); | |
0771da5a | 1035 | rvt_qp_swqe_complete(qp, wqe, IB_WC_SUCCESS); |
f931551b | 1036 | } else |
f24a6d48 | 1037 | this_cpu_inc(*ibp->rvp.rc_delayed_comp); |
f931551b RC |
1038 | |
1039 | qp->s_retry = qp->s_retry_cnt; | |
1040 | update_last_psn(qp, wqe->lpsn); | |
1041 | ||
1042 | /* | |
1043 | * If we are completing a request which is in the process of | |
1044 | * being resent, we can stop resending it since we know the | |
1045 | * responder has already seen it. | |
1046 | */ | |
1047 | if (qp->s_acked == qp->s_cur) { | |
1048 | if (++qp->s_cur >= qp->s_size) | |
1049 | qp->s_cur = 0; | |
1050 | qp->s_acked = qp->s_cur; | |
db3ef0eb | 1051 | wqe = rvt_get_swqe_ptr(qp, qp->s_cur); |
f931551b RC |
1052 | if (qp->s_acked != qp->s_tail) { |
1053 | qp->s_state = OP(SEND_LAST); | |
1054 | qp->s_psn = wqe->psn; | |
1055 | } | |
1056 | } else { | |
1057 | if (++qp->s_acked >= qp->s_size) | |
1058 | qp->s_acked = 0; | |
1059 | if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur) | |
1060 | qp->s_draining = 0; | |
db3ef0eb | 1061 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
1062 | } |
1063 | return wqe; | |
1064 | } | |
1065 | ||
1066 | /** | |
1067 | * do_rc_ack - process an incoming RC ACK | |
1068 | * @qp: the QP the ACK came in on | |
1069 | * @psn: the packet sequence number of the ACK | |
1070 | * @opcode: the opcode of the request that resulted in the ACK | |
1071 | * | |
1072 | * This is called from qib_rc_rcv_resp() to process an incoming RC ACK | |
1073 | * for the given QP. | |
1074 | * Called at interrupt level with the QP s_lock held. | |
1075 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). | |
1076 | */ | |
7c2e11fe | 1077 | static int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode, |
f931551b RC |
1078 | u64 val, struct qib_ctxtdata *rcd) |
1079 | { | |
1080 | struct qib_ibport *ibp; | |
1081 | enum ib_wc_status status; | |
7c2e11fe | 1082 | struct rvt_swqe *wqe; |
f931551b RC |
1083 | int ret = 0; |
1084 | u32 ack_psn; | |
1085 | int diff; | |
1086 | ||
1087 | /* Remove QP from retry timer */ | |
01ba79d4 HC |
1088 | if (qp->s_flags & (RVT_S_TIMER | RVT_S_WAIT_RNR)) { |
1089 | qp->s_flags &= ~(RVT_S_TIMER | RVT_S_WAIT_RNR); | |
f931551b RC |
1090 | del_timer(&qp->s_timer); |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
1095 | * requests and implicitly NAK RDMA read and atomic requests issued | |
1096 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
1097 | * request but will include an ACK'ed request(s). | |
1098 | */ | |
1099 | ack_psn = psn; | |
1100 | if (aeth >> 29) | |
1101 | ack_psn--; | |
db3ef0eb | 1102 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
1103 | ibp = to_iport(qp->ibqp.device, qp->port_num); |
1104 | ||
1105 | /* | |
1106 | * The MSN might be for a later WQE than the PSN indicates so | |
1107 | * only complete WQEs that the PSN finishes. | |
1108 | */ | |
1109 | while ((diff = qib_cmp24(ack_psn, wqe->lpsn)) >= 0) { | |
1110 | /* | |
1111 | * RDMA_READ_RESPONSE_ONLY is a special case since | |
1112 | * we want to generate completion events for everything | |
1113 | * before the RDMA read, copy the data, then generate | |
1114 | * the completion for the read. | |
1115 | */ | |
1116 | if (wqe->wr.opcode == IB_WR_RDMA_READ && | |
1117 | opcode == OP(RDMA_READ_RESPONSE_ONLY) && | |
1118 | diff == 0) { | |
1119 | ret = 1; | |
1120 | goto bail; | |
1121 | } | |
1122 | /* | |
1123 | * If this request is a RDMA read or atomic, and the ACK is | |
1124 | * for a later operation, this ACK NAKs the RDMA read or | |
1125 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
1126 | * can ACK a RDMA read and likewise for atomic ops. Note | |
1127 | * that the NAK case can only happen if relaxed ordering is | |
1128 | * used and requests are sent after an RDMA read or atomic | |
1129 | * is sent but before the response is received. | |
1130 | */ | |
1131 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
1132 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || | |
1133 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1134 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
1135 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { | |
1136 | /* Retry this request. */ | |
01ba79d4 HC |
1137 | if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) { |
1138 | qp->r_flags |= RVT_R_RDMAR_SEQ; | |
f931551b RC |
1139 | qib_restart_rc(qp, qp->s_last_psn + 1, 0); |
1140 | if (list_empty(&qp->rspwait)) { | |
01ba79d4 | 1141 | qp->r_flags |= RVT_R_RSP_SEND; |
4d6f85c3 | 1142 | rvt_get_qp(qp); |
f931551b RC |
1143 | list_add_tail(&qp->rspwait, |
1144 | &rcd->qp_wait_list); | |
1145 | } | |
1146 | } | |
1147 | /* | |
1148 | * No need to process the ACK/NAK since we are | |
1149 | * restarting an earlier request. | |
1150 | */ | |
1151 | goto bail; | |
1152 | } | |
1153 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1154 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { | |
1155 | u64 *vaddr = wqe->sg_list[0].vaddr; | |
1156 | *vaddr = val; | |
1157 | } | |
1158 | if (qp->s_num_rd_atomic && | |
1159 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1160 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1161 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
1162 | qp->s_num_rd_atomic--; | |
1163 | /* Restart sending task if fence is complete */ | |
01ba79d4 | 1164 | if ((qp->s_flags & RVT_S_WAIT_FENCE) && |
f931551b | 1165 | !qp->s_num_rd_atomic) { |
01ba79d4 HC |
1166 | qp->s_flags &= ~(RVT_S_WAIT_FENCE | |
1167 | RVT_S_WAIT_ACK); | |
f931551b | 1168 | qib_schedule_send(qp); |
01ba79d4 HC |
1169 | } else if (qp->s_flags & RVT_S_WAIT_RDMAR) { |
1170 | qp->s_flags &= ~(RVT_S_WAIT_RDMAR | | |
1171 | RVT_S_WAIT_ACK); | |
f931551b RC |
1172 | qib_schedule_send(qp); |
1173 | } | |
1174 | } | |
1175 | wqe = do_rc_completion(qp, wqe, ibp); | |
1176 | if (qp->s_acked == qp->s_tail) | |
1177 | break; | |
1178 | } | |
1179 | ||
1180 | switch (aeth >> 29) { | |
1181 | case 0: /* ACK */ | |
f24a6d48 | 1182 | this_cpu_inc(*ibp->rvp.rc_acks); |
f931551b RC |
1183 | if (qp->s_acked != qp->s_tail) { |
1184 | /* | |
1185 | * We are expecting more ACKs so | |
1186 | * reset the retransmit timer. | |
1187 | */ | |
1188 | start_timer(qp); | |
1189 | /* | |
1190 | * We can stop resending the earlier packets and | |
1191 | * continue with the next packet the receiver wants. | |
1192 | */ | |
1193 | if (qib_cmp24(qp->s_psn, psn) <= 0) | |
1194 | reset_psn(qp, psn + 1); | |
1195 | } else if (qib_cmp24(qp->s_psn, psn) <= 0) { | |
1196 | qp->s_state = OP(SEND_LAST); | |
1197 | qp->s_psn = psn + 1; | |
1198 | } | |
01ba79d4 HC |
1199 | if (qp->s_flags & RVT_S_WAIT_ACK) { |
1200 | qp->s_flags &= ~RVT_S_WAIT_ACK; | |
f931551b RC |
1201 | qib_schedule_send(qp); |
1202 | } | |
1203 | qib_get_credit(qp, aeth); | |
1204 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1205 | qp->s_retry = qp->s_retry_cnt; | |
1206 | update_last_psn(qp, psn); | |
1207 | ret = 1; | |
1208 | goto bail; | |
1209 | ||
1210 | case 1: /* RNR NAK */ | |
f24a6d48 | 1211 | ibp->rvp.n_rnr_naks++; |
f931551b RC |
1212 | if (qp->s_acked == qp->s_tail) |
1213 | goto bail; | |
01ba79d4 | 1214 | if (qp->s_flags & RVT_S_WAIT_RNR) |
f931551b RC |
1215 | goto bail; |
1216 | if (qp->s_rnr_retry == 0) { | |
1217 | status = IB_WC_RNR_RETRY_EXC_ERR; | |
1218 | goto class_b; | |
1219 | } | |
1220 | if (qp->s_rnr_retry_cnt < 7) | |
1221 | qp->s_rnr_retry--; | |
1222 | ||
1223 | /* The last valid PSN is the previous PSN. */ | |
1224 | update_last_psn(qp, psn - 1); | |
1225 | ||
f24a6d48 | 1226 | ibp->rvp.n_rc_resends += (qp->s_psn - psn) & QIB_PSN_MASK; |
f931551b RC |
1227 | |
1228 | reset_psn(qp, psn); | |
1229 | ||
01ba79d4 HC |
1230 | qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK); |
1231 | qp->s_flags |= RVT_S_WAIT_RNR; | |
f931551b RC |
1232 | qp->s_timer.function = qib_rc_rnr_retry; |
1233 | qp->s_timer.expires = jiffies + usecs_to_jiffies( | |
1234 | ib_qib_rnr_table[(aeth >> QIB_AETH_CREDIT_SHIFT) & | |
1235 | QIB_AETH_CREDIT_MASK]); | |
1236 | add_timer(&qp->s_timer); | |
1237 | goto bail; | |
1238 | ||
1239 | case 3: /* NAK */ | |
1240 | if (qp->s_acked == qp->s_tail) | |
1241 | goto bail; | |
1242 | /* The last valid PSN is the previous PSN. */ | |
1243 | update_last_psn(qp, psn - 1); | |
1244 | switch ((aeth >> QIB_AETH_CREDIT_SHIFT) & | |
1245 | QIB_AETH_CREDIT_MASK) { | |
1246 | case 0: /* PSN sequence error */ | |
f24a6d48 | 1247 | ibp->rvp.n_seq_naks++; |
f931551b RC |
1248 | /* |
1249 | * Back up to the responder's expected PSN. | |
1250 | * Note that we might get a NAK in the middle of an | |
1251 | * RDMA READ response which terminates the RDMA | |
1252 | * READ. | |
1253 | */ | |
1254 | qib_restart_rc(qp, psn, 0); | |
1255 | qib_schedule_send(qp); | |
1256 | break; | |
1257 | ||
1258 | case 1: /* Invalid Request */ | |
1259 | status = IB_WC_REM_INV_REQ_ERR; | |
f24a6d48 | 1260 | ibp->rvp.n_other_naks++; |
f931551b RC |
1261 | goto class_b; |
1262 | ||
1263 | case 2: /* Remote Access Error */ | |
1264 | status = IB_WC_REM_ACCESS_ERR; | |
f24a6d48 | 1265 | ibp->rvp.n_other_naks++; |
f931551b RC |
1266 | goto class_b; |
1267 | ||
1268 | case 3: /* Remote Operation Error */ | |
1269 | status = IB_WC_REM_OP_ERR; | |
f24a6d48 | 1270 | ibp->rvp.n_other_naks++; |
f931551b RC |
1271 | class_b: |
1272 | if (qp->s_last == qp->s_acked) { | |
1273 | qib_send_complete(qp, wqe, status); | |
70696ea7 | 1274 | rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); |
f931551b RC |
1275 | } |
1276 | break; | |
1277 | ||
1278 | default: | |
1279 | /* Ignore other reserved NAK error codes */ | |
1280 | goto reserved; | |
1281 | } | |
1282 | qp->s_retry = qp->s_retry_cnt; | |
1283 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1284 | goto bail; | |
1285 | ||
1286 | default: /* 2: reserved */ | |
1287 | reserved: | |
1288 | /* Ignore reserved NAK codes. */ | |
1289 | goto bail; | |
1290 | } | |
1291 | ||
1292 | bail: | |
1293 | return ret; | |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * We have seen an out of sequence RDMA read middle or last packet. | |
1298 | * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE. | |
1299 | */ | |
7c2e11fe | 1300 | static void rdma_seq_err(struct rvt_qp *qp, struct qib_ibport *ibp, u32 psn, |
f931551b RC |
1301 | struct qib_ctxtdata *rcd) |
1302 | { | |
7c2e11fe | 1303 | struct rvt_swqe *wqe; |
f931551b RC |
1304 | |
1305 | /* Remove QP from retry timer */ | |
01ba79d4 HC |
1306 | if (qp->s_flags & (RVT_S_TIMER | RVT_S_WAIT_RNR)) { |
1307 | qp->s_flags &= ~(RVT_S_TIMER | RVT_S_WAIT_RNR); | |
f931551b RC |
1308 | del_timer(&qp->s_timer); |
1309 | } | |
1310 | ||
db3ef0eb | 1311 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
1312 | |
1313 | while (qib_cmp24(psn, wqe->lpsn) > 0) { | |
1314 | if (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1315 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1316 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) | |
1317 | break; | |
1318 | wqe = do_rc_completion(qp, wqe, ibp); | |
1319 | } | |
1320 | ||
f24a6d48 | 1321 | ibp->rvp.n_rdma_seq++; |
01ba79d4 | 1322 | qp->r_flags |= RVT_R_RDMAR_SEQ; |
f931551b RC |
1323 | qib_restart_rc(qp, qp->s_last_psn + 1, 0); |
1324 | if (list_empty(&qp->rspwait)) { | |
01ba79d4 | 1325 | qp->r_flags |= RVT_R_RSP_SEND; |
4d6f85c3 | 1326 | rvt_get_qp(qp); |
f931551b RC |
1327 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
1328 | } | |
1329 | } | |
1330 | ||
1331 | /** | |
1332 | * qib_rc_rcv_resp - process an incoming RC response packet | |
1333 | * @ibp: the port this packet came in on | |
1334 | * @ohdr: the other headers for this packet | |
1335 | * @data: the packet data | |
1336 | * @tlen: the packet length | |
1337 | * @qp: the QP for this packet | |
1338 | * @opcode: the opcode for this packet | |
1339 | * @psn: the packet sequence number for this packet | |
1340 | * @hdrsize: the header length | |
1341 | * @pmtu: the path MTU | |
1342 | * | |
1343 | * This is called from qib_rc_rcv() to process an incoming RC response | |
1344 | * packet for the given QP. | |
1345 | * Called at interrupt level. | |
1346 | */ | |
1347 | static void qib_rc_rcv_resp(struct qib_ibport *ibp, | |
261a4351 | 1348 | struct ib_other_headers *ohdr, |
f931551b | 1349 | void *data, u32 tlen, |
7c2e11fe | 1350 | struct rvt_qp *qp, |
f931551b RC |
1351 | u32 opcode, |
1352 | u32 psn, u32 hdrsize, u32 pmtu, | |
1353 | struct qib_ctxtdata *rcd) | |
1354 | { | |
7c2e11fe | 1355 | struct rvt_swqe *wqe; |
dd04e43d | 1356 | struct qib_pportdata *ppd = ppd_from_ibp(ibp); |
f931551b RC |
1357 | enum ib_wc_status status; |
1358 | unsigned long flags; | |
1359 | int diff; | |
1360 | u32 pad; | |
1361 | u32 aeth; | |
1362 | u64 val; | |
1363 | ||
dd04e43d MM |
1364 | if (opcode != OP(RDMA_READ_RESPONSE_MIDDLE)) { |
1365 | /* | |
1366 | * If ACK'd PSN on SDMA busy list try to make progress to | |
1367 | * reclaim SDMA credits. | |
1368 | */ | |
1369 | if ((qib_cmp24(psn, qp->s_sending_psn) >= 0) && | |
1370 | (qib_cmp24(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) { | |
1371 | ||
1372 | /* | |
1373 | * If send tasklet not running attempt to progress | |
1374 | * SDMA queue. | |
1375 | */ | |
01ba79d4 | 1376 | if (!(qp->s_flags & RVT_S_BUSY)) { |
dd04e43d MM |
1377 | /* Acquire SDMA Lock */ |
1378 | spin_lock_irqsave(&ppd->sdma_lock, flags); | |
1379 | /* Invoke sdma make progress */ | |
1380 | qib_sdma_make_progress(ppd); | |
1381 | /* Release SDMA Lock */ | |
1382 | spin_unlock_irqrestore(&ppd->sdma_lock, flags); | |
1383 | } | |
1384 | } | |
1385 | } | |
1386 | ||
f931551b | 1387 | spin_lock_irqsave(&qp->s_lock, flags); |
db3ef0eb | 1388 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) |
414ed90c | 1389 | goto ack_done; |
f931551b | 1390 | |
f931551b | 1391 | /* Ignore invalid responses. */ |
46a80d62 MM |
1392 | smp_read_barrier_depends(); /* see post_one_send */ |
1393 | if (qib_cmp24(psn, ACCESS_ONCE(qp->s_next_psn)) >= 0) | |
f931551b RC |
1394 | goto ack_done; |
1395 | ||
1396 | /* Ignore duplicate responses. */ | |
1397 | diff = qib_cmp24(psn, qp->s_last_psn); | |
1398 | if (unlikely(diff <= 0)) { | |
1399 | /* Update credits for "ghost" ACKs */ | |
1400 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1401 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1402 | if ((aeth >> 29) == 0) | |
1403 | qib_get_credit(qp, aeth); | |
1404 | } | |
1405 | goto ack_done; | |
1406 | } | |
1407 | ||
1408 | /* | |
1409 | * Skip everything other than the PSN we expect, if we are waiting | |
1410 | * for a reply to a restarted RDMA read or atomic op. | |
1411 | */ | |
01ba79d4 | 1412 | if (qp->r_flags & RVT_R_RDMAR_SEQ) { |
f931551b RC |
1413 | if (qib_cmp24(psn, qp->s_last_psn + 1) != 0) |
1414 | goto ack_done; | |
01ba79d4 | 1415 | qp->r_flags &= ~RVT_R_RDMAR_SEQ; |
f931551b RC |
1416 | } |
1417 | ||
1418 | if (unlikely(qp->s_acked == qp->s_tail)) | |
1419 | goto ack_done; | |
db3ef0eb | 1420 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
1421 | status = IB_WC_SUCCESS; |
1422 | ||
1423 | switch (opcode) { | |
1424 | case OP(ACKNOWLEDGE): | |
1425 | case OP(ATOMIC_ACKNOWLEDGE): | |
1426 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1427 | aeth = be32_to_cpu(ohdr->u.aeth); | |
261a4351 MM |
1428 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) |
1429 | val = ib_u64_get(&ohdr->u.at.atomic_ack_eth); | |
1430 | else | |
f931551b RC |
1431 | val = 0; |
1432 | if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || | |
1433 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) | |
1434 | goto ack_done; | |
1435 | hdrsize += 4; | |
db3ef0eb | 1436 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
1437 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
1438 | goto ack_op_err; | |
1439 | /* | |
1440 | * If this is a response to a resent RDMA read, we | |
1441 | * have to be careful to copy the data to the right | |
1442 | * location. | |
1443 | */ | |
1444 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1445 | wqe, psn, pmtu); | |
1446 | goto read_middle; | |
1447 | ||
1448 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1449 | /* no AETH, no ACK */ | |
1450 | if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1))) | |
1451 | goto ack_seq_err; | |
1452 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1453 | goto ack_op_err; | |
1454 | read_middle: | |
1455 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1456 | goto ack_len_err; | |
1457 | if (unlikely(pmtu >= qp->s_rdma_read_len)) | |
1458 | goto ack_len_err; | |
1459 | ||
1460 | /* | |
1461 | * We got a response so update the timeout. | |
1462 | * 4.096 usec. * (1 << qp->timeout) | |
1463 | */ | |
01ba79d4 | 1464 | qp->s_flags |= RVT_S_TIMER; |
d0f2faf7 | 1465 | mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies); |
01ba79d4 HC |
1466 | if (qp->s_flags & RVT_S_WAIT_ACK) { |
1467 | qp->s_flags &= ~RVT_S_WAIT_ACK; | |
f931551b RC |
1468 | qib_schedule_send(qp); |
1469 | } | |
1470 | ||
1471 | if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) | |
1472 | qp->s_retry = qp->s_retry_cnt; | |
1473 | ||
1474 | /* | |
1475 | * Update the RDMA receive state but do the copy w/o | |
1476 | * holding the locks and blocking interrupts. | |
1477 | */ | |
1478 | qp->s_rdma_read_len -= pmtu; | |
1479 | update_last_psn(qp, psn); | |
1480 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1481 | qib_copy_sge(&qp->s_rdma_read_sge, data, pmtu, 0); | |
1482 | goto bail; | |
1483 | ||
1484 | case OP(RDMA_READ_RESPONSE_ONLY): | |
1485 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1486 | if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) | |
1487 | goto ack_done; | |
1488 | /* Get the number of bytes the message was padded by. */ | |
1489 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1490 | /* | |
1491 | * Check that the data size is >= 0 && <= pmtu. | |
1492 | * Remember to account for the AETH header (4) and | |
1493 | * ICRC (4). | |
1494 | */ | |
1495 | if (unlikely(tlen < (hdrsize + pad + 8))) | |
1496 | goto ack_len_err; | |
1497 | /* | |
1498 | * If this is a response to a resent RDMA read, we | |
1499 | * have to be careful to copy the data to the right | |
1500 | * location. | |
1501 | */ | |
db3ef0eb | 1502 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f931551b RC |
1503 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1504 | wqe, psn, pmtu); | |
1505 | goto read_last; | |
1506 | ||
1507 | case OP(RDMA_READ_RESPONSE_LAST): | |
1508 | /* ACKs READ req. */ | |
1509 | if (unlikely(qib_cmp24(psn, qp->s_last_psn + 1))) | |
1510 | goto ack_seq_err; | |
1511 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1512 | goto ack_op_err; | |
1513 | /* Get the number of bytes the message was padded by. */ | |
1514 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1515 | /* | |
1516 | * Check that the data size is >= 1 && <= pmtu. | |
1517 | * Remember to account for the AETH header (4) and | |
1518 | * ICRC (4). | |
1519 | */ | |
1520 | if (unlikely(tlen <= (hdrsize + pad + 8))) | |
1521 | goto ack_len_err; | |
1522 | read_last: | |
1523 | tlen -= hdrsize + pad + 8; | |
1524 | if (unlikely(tlen != qp->s_rdma_read_len)) | |
1525 | goto ack_len_err; | |
1526 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1527 | qib_copy_sge(&qp->s_rdma_read_sge, data, tlen, 0); | |
1528 | WARN_ON(qp->s_rdma_read_sge.num_sge); | |
1529 | (void) do_rc_ack(qp, aeth, psn, | |
1530 | OP(RDMA_READ_RESPONSE_LAST), 0, rcd); | |
1531 | goto ack_done; | |
1532 | } | |
1533 | ||
1534 | ack_op_err: | |
1535 | status = IB_WC_LOC_QP_OP_ERR; | |
1536 | goto ack_err; | |
1537 | ||
1538 | ack_seq_err: | |
1539 | rdma_seq_err(qp, ibp, psn, rcd); | |
1540 | goto ack_done; | |
1541 | ||
1542 | ack_len_err: | |
1543 | status = IB_WC_LOC_LEN_ERR; | |
1544 | ack_err: | |
1545 | if (qp->s_last == qp->s_acked) { | |
1546 | qib_send_complete(qp, wqe, status); | |
70696ea7 | 1547 | rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); |
f931551b RC |
1548 | } |
1549 | ack_done: | |
1550 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1551 | bail: | |
1552 | return; | |
1553 | } | |
1554 | ||
1555 | /** | |
1556 | * qib_rc_rcv_error - process an incoming duplicate or error RC packet | |
1557 | * @ohdr: the other headers for this packet | |
1558 | * @data: the packet data | |
1559 | * @qp: the QP for this packet | |
1560 | * @opcode: the opcode for this packet | |
1561 | * @psn: the packet sequence number for this packet | |
1562 | * @diff: the difference between the PSN and the expected PSN | |
1563 | * | |
1564 | * This is called from qib_rc_rcv() to process an unexpected | |
1565 | * incoming RC packet for the given QP. | |
1566 | * Called at interrupt level. | |
1567 | * Return 1 if no more processing is needed; otherwise return 0 to | |
1568 | * schedule a response to be sent. | |
1569 | */ | |
261a4351 | 1570 | static int qib_rc_rcv_error(struct ib_other_headers *ohdr, |
f931551b | 1571 | void *data, |
7c2e11fe | 1572 | struct rvt_qp *qp, |
f931551b RC |
1573 | u32 opcode, |
1574 | u32 psn, | |
1575 | int diff, | |
1576 | struct qib_ctxtdata *rcd) | |
1577 | { | |
1578 | struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
7c2e11fe | 1579 | struct rvt_ack_entry *e; |
f931551b RC |
1580 | unsigned long flags; |
1581 | u8 i, prev; | |
1582 | int old_req; | |
1583 | ||
1584 | if (diff > 0) { | |
1585 | /* | |
1586 | * Packet sequence error. | |
1587 | * A NAK will ACK earlier sends and RDMA writes. | |
1588 | * Don't queue the NAK if we already sent one. | |
1589 | */ | |
1590 | if (!qp->r_nak_state) { | |
f24a6d48 | 1591 | ibp->rvp.n_rc_seqnak++; |
f931551b RC |
1592 | qp->r_nak_state = IB_NAK_PSN_ERROR; |
1593 | /* Use the expected PSN. */ | |
1594 | qp->r_ack_psn = qp->r_psn; | |
1595 | /* | |
1596 | * Wait to send the sequence NAK until all packets | |
1597 | * in the receive queue have been processed. | |
1598 | * Otherwise, we end up propagating congestion. | |
1599 | */ | |
1600 | if (list_empty(&qp->rspwait)) { | |
01ba79d4 | 1601 | qp->r_flags |= RVT_R_RSP_NAK; |
4d6f85c3 | 1602 | rvt_get_qp(qp); |
f931551b RC |
1603 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
1604 | } | |
1605 | } | |
1606 | goto done; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1611 | * write or atomic op. Don't NAK errors, just silently drop | |
1612 | * the duplicate request. Note that r_sge, r_len, and | |
1613 | * r_rcv_len may be in use so don't modify them. | |
1614 | * | |
1615 | * We are supposed to ACK the earliest duplicate PSN but we | |
1616 | * can coalesce an outstanding duplicate ACK. We have to | |
1617 | * send the earliest so that RDMA reads can be restarted at | |
1618 | * the requester's expected PSN. | |
1619 | * | |
1620 | * First, find where this duplicate PSN falls within the | |
1621 | * ACKs previously sent. | |
1622 | * old_req is true if there is an older response that is scheduled | |
1623 | * to be sent before sending this one. | |
1624 | */ | |
1625 | e = NULL; | |
1626 | old_req = 1; | |
f24a6d48 | 1627 | ibp->rvp.n_rc_dupreq++; |
f931551b RC |
1628 | |
1629 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
1630 | |
1631 | for (i = qp->r_head_ack_queue; ; i = prev) { | |
1632 | if (i == qp->s_tail_ack_queue) | |
1633 | old_req = 0; | |
1634 | if (i) | |
1635 | prev = i - 1; | |
1636 | else | |
1637 | prev = QIB_MAX_RDMA_ATOMIC; | |
1638 | if (prev == qp->r_head_ack_queue) { | |
1639 | e = NULL; | |
1640 | break; | |
1641 | } | |
1642 | e = &qp->s_ack_queue[prev]; | |
1643 | if (!e->opcode) { | |
1644 | e = NULL; | |
1645 | break; | |
1646 | } | |
1647 | if (qib_cmp24(psn, e->psn) >= 0) { | |
1648 | if (prev == qp->s_tail_ack_queue && | |
1649 | qib_cmp24(psn, e->lpsn) <= 0) | |
1650 | old_req = 0; | |
1651 | break; | |
1652 | } | |
1653 | } | |
1654 | switch (opcode) { | |
1655 | case OP(RDMA_READ_REQUEST): { | |
1656 | struct ib_reth *reth; | |
1657 | u32 offset; | |
1658 | u32 len; | |
1659 | ||
1660 | /* | |
1661 | * If we didn't find the RDMA read request in the ack queue, | |
1662 | * we can ignore this request. | |
1663 | */ | |
1664 | if (!e || e->opcode != OP(RDMA_READ_REQUEST)) | |
1665 | goto unlock_done; | |
1666 | /* RETH comes after BTH */ | |
1667 | reth = &ohdr->u.rc.reth; | |
1668 | /* | |
1669 | * Address range must be a subset of the original | |
1670 | * request and start on pmtu boundaries. | |
1671 | * We reuse the old ack_queue slot since the requester | |
1672 | * should not back up and request an earlier PSN for the | |
1673 | * same request. | |
1674 | */ | |
1675 | offset = ((psn - e->psn) & QIB_PSN_MASK) * | |
cc6ea138 | 1676 | qp->pmtu; |
f931551b RC |
1677 | len = be32_to_cpu(reth->length); |
1678 | if (unlikely(offset + len != e->rdma_sge.sge_length)) | |
1679 | goto unlock_done; | |
1680 | if (e->rdma_sge.mr) { | |
7c2e11fe | 1681 | rvt_put_mr(e->rdma_sge.mr); |
f931551b RC |
1682 | e->rdma_sge.mr = NULL; |
1683 | } | |
1684 | if (len != 0) { | |
1685 | u32 rkey = be32_to_cpu(reth->rkey); | |
1686 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1687 | int ok; | |
1688 | ||
7c2e11fe | 1689 | ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, |
f931551b RC |
1690 | IB_ACCESS_REMOTE_READ); |
1691 | if (unlikely(!ok)) | |
1692 | goto unlock_done; | |
1693 | } else { | |
1694 | e->rdma_sge.vaddr = NULL; | |
1695 | e->rdma_sge.length = 0; | |
1696 | e->rdma_sge.sge_length = 0; | |
1697 | } | |
1698 | e->psn = psn; | |
1699 | if (old_req) | |
1700 | goto unlock_done; | |
1701 | qp->s_tail_ack_queue = prev; | |
1702 | break; | |
1703 | } | |
1704 | ||
1705 | case OP(COMPARE_SWAP): | |
1706 | case OP(FETCH_ADD): { | |
1707 | /* | |
1708 | * If we didn't find the atomic request in the ack queue | |
1709 | * or the send tasklet is already backed up to send an | |
1710 | * earlier entry, we can ignore this request. | |
1711 | */ | |
1712 | if (!e || e->opcode != (u8) opcode || old_req) | |
1713 | goto unlock_done; | |
1714 | qp->s_tail_ack_queue = prev; | |
1715 | break; | |
1716 | } | |
1717 | ||
1718 | default: | |
1719 | /* | |
1720 | * Ignore this operation if it doesn't request an ACK | |
1721 | * or an earlier RDMA read or atomic is going to be resent. | |
1722 | */ | |
1723 | if (!(psn & IB_BTH_REQ_ACK) || old_req) | |
1724 | goto unlock_done; | |
1725 | /* | |
1726 | * Resend the most recent ACK if this request is | |
1727 | * after all the previous RDMA reads and atomics. | |
1728 | */ | |
1729 | if (i == qp->r_head_ack_queue) { | |
1730 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1731 | qp->r_nak_state = 0; | |
1732 | qp->r_ack_psn = qp->r_psn - 1; | |
1733 | goto send_ack; | |
1734 | } | |
1735 | /* | |
1736 | * Try to send a simple ACK to work around a Mellanox bug | |
1737 | * which doesn't accept a RDMA read response or atomic | |
1738 | * response as an ACK for earlier SENDs or RDMA writes. | |
1739 | */ | |
01ba79d4 | 1740 | if (!(qp->s_flags & RVT_S_RESP_PENDING)) { |
f931551b RC |
1741 | spin_unlock_irqrestore(&qp->s_lock, flags); |
1742 | qp->r_nak_state = 0; | |
1743 | qp->r_ack_psn = qp->s_ack_queue[i].psn - 1; | |
1744 | goto send_ack; | |
1745 | } | |
1746 | /* | |
1747 | * Resend the RDMA read or atomic op which | |
1748 | * ACKs this duplicate request. | |
1749 | */ | |
1750 | qp->s_tail_ack_queue = i; | |
1751 | break; | |
1752 | } | |
1753 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
01ba79d4 | 1754 | qp->s_flags |= RVT_S_RESP_PENDING; |
f931551b RC |
1755 | qp->r_nak_state = 0; |
1756 | qib_schedule_send(qp); | |
1757 | ||
1758 | unlock_done: | |
1759 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1760 | done: | |
1761 | return 1; | |
1762 | ||
1763 | send_ack: | |
1764 | return 0; | |
1765 | } | |
1766 | ||
7c2e11fe | 1767 | void qib_rc_error(struct rvt_qp *qp, enum ib_wc_status err) |
f931551b RC |
1768 | { |
1769 | unsigned long flags; | |
1770 | int lastwqe; | |
1771 | ||
1772 | spin_lock_irqsave(&qp->s_lock, flags); | |
70696ea7 | 1773 | lastwqe = rvt_error_qp(qp, err); |
f931551b RC |
1774 | spin_unlock_irqrestore(&qp->s_lock, flags); |
1775 | ||
1776 | if (lastwqe) { | |
1777 | struct ib_event ev; | |
1778 | ||
1779 | ev.device = qp->ibqp.device; | |
1780 | ev.element.qp = &qp->ibqp; | |
1781 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
1782 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1783 | } | |
1784 | } | |
1785 | ||
7c2e11fe | 1786 | static inline void qib_update_ack_queue(struct rvt_qp *qp, unsigned n) |
f931551b RC |
1787 | { |
1788 | unsigned next; | |
1789 | ||
1790 | next = n + 1; | |
1791 | if (next > QIB_MAX_RDMA_ATOMIC) | |
1792 | next = 0; | |
1793 | qp->s_tail_ack_queue = next; | |
1794 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1795 | } | |
1796 | ||
1797 | /** | |
1798 | * qib_rc_rcv - process an incoming RC packet | |
1799 | * @rcd: the context pointer | |
1800 | * @hdr: the header of this packet | |
1801 | * @has_grh: true if the header has a GRH | |
1802 | * @data: the packet data | |
1803 | * @tlen: the packet length | |
1804 | * @qp: the QP for this packet | |
1805 | * | |
1806 | * This is called from qib_qp_rcv() to process an incoming RC packet | |
1807 | * for the given QP. | |
1808 | * Called at interrupt level. | |
1809 | */ | |
261a4351 | 1810 | void qib_rc_rcv(struct qib_ctxtdata *rcd, struct ib_header *hdr, |
7c2e11fe | 1811 | int has_grh, void *data, u32 tlen, struct rvt_qp *qp) |
f931551b RC |
1812 | { |
1813 | struct qib_ibport *ibp = &rcd->ppd->ibport_data; | |
261a4351 | 1814 | struct ib_other_headers *ohdr; |
f931551b RC |
1815 | u32 opcode; |
1816 | u32 hdrsize; | |
1817 | u32 psn; | |
1818 | u32 pad; | |
1819 | struct ib_wc wc; | |
cc6ea138 | 1820 | u32 pmtu = qp->pmtu; |
f931551b RC |
1821 | int diff; |
1822 | struct ib_reth *reth; | |
1823 | unsigned long flags; | |
1824 | int ret; | |
1825 | ||
1826 | /* Check for GRH */ | |
1827 | if (!has_grh) { | |
1828 | ohdr = &hdr->u.oth; | |
1829 | hdrsize = 8 + 12; /* LRH + BTH */ | |
1830 | } else { | |
1831 | ohdr = &hdr->u.l.oth; | |
1832 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
1833 | } | |
1834 | ||
1835 | opcode = be32_to_cpu(ohdr->bth[0]); | |
f931551b | 1836 | if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode)) |
9fd5473d | 1837 | return; |
f931551b RC |
1838 | |
1839 | psn = be32_to_cpu(ohdr->bth[2]); | |
1840 | opcode >>= 24; | |
1841 | ||
f931551b RC |
1842 | /* |
1843 | * Process responses (ACKs) before anything else. Note that the | |
1844 | * packet sequence number will be for something in the send work | |
1845 | * queue rather than the expected receive packet sequence number. | |
1846 | * In other words, this QP is the requester. | |
1847 | */ | |
1848 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
1849 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1850 | qib_rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn, | |
1851 | hdrsize, pmtu, rcd); | |
a5210c12 | 1852 | return; |
f931551b RC |
1853 | } |
1854 | ||
1855 | /* Compute 24 bits worth of difference. */ | |
1856 | diff = qib_cmp24(psn, qp->r_psn); | |
1857 | if (unlikely(diff)) { | |
1858 | if (qib_rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) | |
a5210c12 | 1859 | return; |
f931551b RC |
1860 | goto send_ack; |
1861 | } | |
1862 | ||
1863 | /* Check for opcode sequence errors. */ | |
1864 | switch (qp->r_state) { | |
1865 | case OP(SEND_FIRST): | |
1866 | case OP(SEND_MIDDLE): | |
1867 | if (opcode == OP(SEND_MIDDLE) || | |
1868 | opcode == OP(SEND_LAST) || | |
1869 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
1870 | break; | |
1871 | goto nack_inv; | |
1872 | ||
1873 | case OP(RDMA_WRITE_FIRST): | |
1874 | case OP(RDMA_WRITE_MIDDLE): | |
1875 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
1876 | opcode == OP(RDMA_WRITE_LAST) || | |
1877 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1878 | break; | |
1879 | goto nack_inv; | |
1880 | ||
1881 | default: | |
1882 | if (opcode == OP(SEND_MIDDLE) || | |
1883 | opcode == OP(SEND_LAST) || | |
1884 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
1885 | opcode == OP(RDMA_WRITE_MIDDLE) || | |
1886 | opcode == OP(RDMA_WRITE_LAST) || | |
1887 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1888 | goto nack_inv; | |
1889 | /* | |
1890 | * Note that it is up to the requester to not send a new | |
1891 | * RDMA read or atomic operation before receiving an ACK | |
1892 | * for the previous operation. | |
1893 | */ | |
1894 | break; | |
1895 | } | |
1896 | ||
01ba79d4 HC |
1897 | if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) { |
1898 | qp->r_flags |= RVT_R_COMM_EST; | |
f931551b RC |
1899 | if (qp->ibqp.event_handler) { |
1900 | struct ib_event ev; | |
1901 | ||
1902 | ev.device = qp->ibqp.device; | |
1903 | ev.element.qp = &qp->ibqp; | |
1904 | ev.event = IB_EVENT_COMM_EST; | |
1905 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1906 | } | |
1907 | } | |
1908 | ||
1909 | /* OK, process the packet. */ | |
1910 | switch (opcode) { | |
1911 | case OP(SEND_FIRST): | |
1912 | ret = qib_get_rwqe(qp, 0); | |
1913 | if (ret < 0) | |
1914 | goto nack_op_err; | |
1915 | if (!ret) | |
1916 | goto rnr_nak; | |
1917 | qp->r_rcv_len = 0; | |
1918 | /* FALLTHROUGH */ | |
1919 | case OP(SEND_MIDDLE): | |
1920 | case OP(RDMA_WRITE_MIDDLE): | |
1921 | send_middle: | |
1922 | /* Check for invalid length PMTU or posted rwqe len. */ | |
1923 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1924 | goto nack_inv; | |
1925 | qp->r_rcv_len += pmtu; | |
1926 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
1927 | goto nack_inv; | |
1928 | qib_copy_sge(&qp->r_sge, data, pmtu, 1); | |
1929 | break; | |
1930 | ||
1931 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
1932 | /* consume RWQE */ | |
1933 | ret = qib_get_rwqe(qp, 1); | |
1934 | if (ret < 0) | |
1935 | goto nack_op_err; | |
1936 | if (!ret) | |
1937 | goto rnr_nak; | |
1938 | goto send_last_imm; | |
1939 | ||
1940 | case OP(SEND_ONLY): | |
1941 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
1942 | ret = qib_get_rwqe(qp, 0); | |
1943 | if (ret < 0) | |
1944 | goto nack_op_err; | |
1945 | if (!ret) | |
1946 | goto rnr_nak; | |
1947 | qp->r_rcv_len = 0; | |
1948 | if (opcode == OP(SEND_ONLY)) | |
2fc109c8 MM |
1949 | goto no_immediate_data; |
1950 | /* FALLTHROUGH for SEND_ONLY_WITH_IMMEDIATE */ | |
f931551b RC |
1951 | case OP(SEND_LAST_WITH_IMMEDIATE): |
1952 | send_last_imm: | |
1953 | wc.ex.imm_data = ohdr->u.imm_data; | |
1954 | hdrsize += 4; | |
1955 | wc.wc_flags = IB_WC_WITH_IMM; | |
2fc109c8 | 1956 | goto send_last; |
f931551b RC |
1957 | case OP(SEND_LAST): |
1958 | case OP(RDMA_WRITE_LAST): | |
2fc109c8 MM |
1959 | no_immediate_data: |
1960 | wc.wc_flags = 0; | |
1961 | wc.ex.imm_data = 0; | |
f931551b RC |
1962 | send_last: |
1963 | /* Get the number of bytes the message was padded by. */ | |
1964 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1965 | /* Check for invalid length. */ | |
1966 | /* XXX LAST len should be >= 1 */ | |
1967 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
1968 | goto nack_inv; | |
1969 | /* Don't count the CRC. */ | |
1970 | tlen -= (hdrsize + pad + 4); | |
1971 | wc.byte_len = tlen + qp->r_rcv_len; | |
1972 | if (unlikely(wc.byte_len > qp->r_len)) | |
1973 | goto nack_inv; | |
1974 | qib_copy_sge(&qp->r_sge, data, tlen, 1); | |
70696ea7 | 1975 | rvt_put_ss(&qp->r_sge); |
f931551b | 1976 | qp->r_msn++; |
01ba79d4 | 1977 | if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) |
f931551b RC |
1978 | break; |
1979 | wc.wr_id = qp->r_wr_id; | |
1980 | wc.status = IB_WC_SUCCESS; | |
1981 | if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || | |
1982 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) | |
1983 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
1984 | else | |
1985 | wc.opcode = IB_WC_RECV; | |
1986 | wc.qp = &qp->ibqp; | |
1987 | wc.src_qp = qp->remote_qpn; | |
1988 | wc.slid = qp->remote_ah_attr.dlid; | |
1989 | wc.sl = qp->remote_ah_attr.sl; | |
2fc109c8 MM |
1990 | /* zero fields that are N/A */ |
1991 | wc.vendor_err = 0; | |
1992 | wc.pkey_index = 0; | |
1993 | wc.dlid_path_bits = 0; | |
1994 | wc.port_num = 0; | |
f931551b | 1995 | /* Signal completion event if the solicited bit is set. */ |
4bb88e5f | 1996 | rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, |
f931551b RC |
1997 | (ohdr->bth[0] & |
1998 | cpu_to_be32(IB_BTH_SOLICITED)) != 0); | |
1999 | break; | |
2000 | ||
2001 | case OP(RDMA_WRITE_FIRST): | |
2002 | case OP(RDMA_WRITE_ONLY): | |
2003 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
2004 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
2005 | goto nack_inv; | |
2006 | /* consume RWQE */ | |
2007 | reth = &ohdr->u.rc.reth; | |
2008 | hdrsize += sizeof(*reth); | |
2009 | qp->r_len = be32_to_cpu(reth->length); | |
2010 | qp->r_rcv_len = 0; | |
2011 | qp->r_sge.sg_list = NULL; | |
2012 | if (qp->r_len != 0) { | |
2013 | u32 rkey = be32_to_cpu(reth->rkey); | |
2014 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
2015 | int ok; | |
2016 | ||
2017 | /* Check rkey & NAK */ | |
7c2e11fe | 2018 | ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, |
f931551b RC |
2019 | rkey, IB_ACCESS_REMOTE_WRITE); |
2020 | if (unlikely(!ok)) | |
2021 | goto nack_acc; | |
2022 | qp->r_sge.num_sge = 1; | |
2023 | } else { | |
2024 | qp->r_sge.num_sge = 0; | |
2025 | qp->r_sge.sge.mr = NULL; | |
2026 | qp->r_sge.sge.vaddr = NULL; | |
2027 | qp->r_sge.sge.length = 0; | |
2028 | qp->r_sge.sge.sge_length = 0; | |
2029 | } | |
2030 | if (opcode == OP(RDMA_WRITE_FIRST)) | |
2031 | goto send_middle; | |
2032 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
2fc109c8 | 2033 | goto no_immediate_data; |
f931551b RC |
2034 | ret = qib_get_rwqe(qp, 1); |
2035 | if (ret < 0) | |
2036 | goto nack_op_err; | |
2037 | if (!ret) | |
2038 | goto rnr_nak; | |
5715f5d4 JG |
2039 | wc.ex.imm_data = ohdr->u.rc.imm_data; |
2040 | hdrsize += 4; | |
2041 | wc.wc_flags = IB_WC_WITH_IMM; | |
2042 | goto send_last; | |
f931551b RC |
2043 | |
2044 | case OP(RDMA_READ_REQUEST): { | |
7c2e11fe | 2045 | struct rvt_ack_entry *e; |
f931551b RC |
2046 | u32 len; |
2047 | u8 next; | |
2048 | ||
2049 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
2050 | goto nack_inv; | |
2051 | next = qp->r_head_ack_queue + 1; | |
2052 | /* s_ack_queue is size QIB_MAX_RDMA_ATOMIC+1 so use > not >= */ | |
2053 | if (next > QIB_MAX_RDMA_ATOMIC) | |
2054 | next = 0; | |
2055 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
2056 | if (unlikely(next == qp->s_tail_ack_queue)) { |
2057 | if (!qp->s_ack_queue[next].sent) | |
2058 | goto nack_inv_unlck; | |
2059 | qib_update_ack_queue(qp, next); | |
2060 | } | |
2061 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2062 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
7c2e11fe | 2063 | rvt_put_mr(e->rdma_sge.mr); |
f931551b RC |
2064 | e->rdma_sge.mr = NULL; |
2065 | } | |
2066 | reth = &ohdr->u.rc.reth; | |
2067 | len = be32_to_cpu(reth->length); | |
2068 | if (len) { | |
2069 | u32 rkey = be32_to_cpu(reth->rkey); | |
2070 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
2071 | int ok; | |
2072 | ||
2073 | /* Check rkey & NAK */ | |
7c2e11fe | 2074 | ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, |
f931551b RC |
2075 | rkey, IB_ACCESS_REMOTE_READ); |
2076 | if (unlikely(!ok)) | |
2077 | goto nack_acc_unlck; | |
2078 | /* | |
2079 | * Update the next expected PSN. We add 1 later | |
2080 | * below, so only add the remainder here. | |
2081 | */ | |
5dc80605 | 2082 | qp->r_psn += rvt_div_mtu(qp, len - 1); |
f931551b RC |
2083 | } else { |
2084 | e->rdma_sge.mr = NULL; | |
2085 | e->rdma_sge.vaddr = NULL; | |
2086 | e->rdma_sge.length = 0; | |
2087 | e->rdma_sge.sge_length = 0; | |
2088 | } | |
2089 | e->opcode = opcode; | |
2090 | e->sent = 0; | |
2091 | e->psn = psn; | |
2092 | e->lpsn = qp->r_psn; | |
2093 | /* | |
2094 | * We need to increment the MSN here instead of when we | |
2095 | * finish sending the result since a duplicate request would | |
2096 | * increment it more than once. | |
2097 | */ | |
2098 | qp->r_msn++; | |
2099 | qp->r_psn++; | |
2100 | qp->r_state = opcode; | |
2101 | qp->r_nak_state = 0; | |
2102 | qp->r_head_ack_queue = next; | |
2103 | ||
2104 | /* Schedule the send tasklet. */ | |
01ba79d4 | 2105 | qp->s_flags |= RVT_S_RESP_PENDING; |
f931551b RC |
2106 | qib_schedule_send(qp); |
2107 | ||
a5210c12 | 2108 | goto sunlock; |
f931551b RC |
2109 | } |
2110 | ||
2111 | case OP(COMPARE_SWAP): | |
2112 | case OP(FETCH_ADD): { | |
2113 | struct ib_atomic_eth *ateth; | |
7c2e11fe | 2114 | struct rvt_ack_entry *e; |
f931551b RC |
2115 | u64 vaddr; |
2116 | atomic64_t *maddr; | |
2117 | u64 sdata; | |
2118 | u32 rkey; | |
2119 | u8 next; | |
2120 | ||
2121 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) | |
2122 | goto nack_inv; | |
2123 | next = qp->r_head_ack_queue + 1; | |
2124 | if (next > QIB_MAX_RDMA_ATOMIC) | |
2125 | next = 0; | |
2126 | spin_lock_irqsave(&qp->s_lock, flags); | |
f931551b RC |
2127 | if (unlikely(next == qp->s_tail_ack_queue)) { |
2128 | if (!qp->s_ack_queue[next].sent) | |
2129 | goto nack_inv_unlck; | |
2130 | qib_update_ack_queue(qp, next); | |
2131 | } | |
2132 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2133 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
7c2e11fe | 2134 | rvt_put_mr(e->rdma_sge.mr); |
f931551b RC |
2135 | e->rdma_sge.mr = NULL; |
2136 | } | |
2137 | ateth = &ohdr->u.atomic_eth; | |
261a4351 | 2138 | vaddr = get_ib_ateth_vaddr(ateth); |
f931551b RC |
2139 | if (unlikely(vaddr & (sizeof(u64) - 1))) |
2140 | goto nack_inv_unlck; | |
2141 | rkey = be32_to_cpu(ateth->rkey); | |
2142 | /* Check rkey & NAK */ | |
7c2e11fe | 2143 | if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), |
f931551b RC |
2144 | vaddr, rkey, |
2145 | IB_ACCESS_REMOTE_ATOMIC))) | |
2146 | goto nack_acc_unlck; | |
2147 | /* Perform atomic OP and save result. */ | |
2148 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; | |
261a4351 | 2149 | sdata = get_ib_ateth_swap(ateth); |
f931551b RC |
2150 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? |
2151 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
2152 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
261a4351 | 2153 | get_ib_ateth_compare(ateth), |
f931551b | 2154 | sdata); |
7c2e11fe | 2155 | rvt_put_mr(qp->r_sge.sge.mr); |
f931551b RC |
2156 | qp->r_sge.num_sge = 0; |
2157 | e->opcode = opcode; | |
2158 | e->sent = 0; | |
2159 | e->psn = psn; | |
2160 | e->lpsn = psn; | |
2161 | qp->r_msn++; | |
2162 | qp->r_psn++; | |
2163 | qp->r_state = opcode; | |
2164 | qp->r_nak_state = 0; | |
2165 | qp->r_head_ack_queue = next; | |
2166 | ||
2167 | /* Schedule the send tasklet. */ | |
01ba79d4 | 2168 | qp->s_flags |= RVT_S_RESP_PENDING; |
f931551b RC |
2169 | qib_schedule_send(qp); |
2170 | ||
a5210c12 | 2171 | goto sunlock; |
f931551b RC |
2172 | } |
2173 | ||
2174 | default: | |
2175 | /* NAK unknown opcodes. */ | |
2176 | goto nack_inv; | |
2177 | } | |
2178 | qp->r_psn++; | |
2179 | qp->r_state = opcode; | |
2180 | qp->r_ack_psn = psn; | |
2181 | qp->r_nak_state = 0; | |
2182 | /* Send an ACK if requested or required. */ | |
2183 | if (psn & (1 << 31)) | |
2184 | goto send_ack; | |
a5210c12 | 2185 | return; |
f931551b RC |
2186 | |
2187 | rnr_nak: | |
2188 | qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; | |
2189 | qp->r_ack_psn = qp->r_psn; | |
2190 | /* Queue RNR NAK for later */ | |
2191 | if (list_empty(&qp->rspwait)) { | |
01ba79d4 | 2192 | qp->r_flags |= RVT_R_RSP_NAK; |
4d6f85c3 | 2193 | rvt_get_qp(qp); |
f931551b RC |
2194 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
2195 | } | |
a5210c12 | 2196 | return; |
f931551b RC |
2197 | |
2198 | nack_op_err: | |
2199 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
2200 | qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; | |
2201 | qp->r_ack_psn = qp->r_psn; | |
2202 | /* Queue NAK for later */ | |
2203 | if (list_empty(&qp->rspwait)) { | |
01ba79d4 | 2204 | qp->r_flags |= RVT_R_RSP_NAK; |
4d6f85c3 | 2205 | rvt_get_qp(qp); |
f931551b RC |
2206 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
2207 | } | |
a5210c12 | 2208 | return; |
f931551b RC |
2209 | |
2210 | nack_inv_unlck: | |
2211 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2212 | nack_inv: | |
2213 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
2214 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; | |
2215 | qp->r_ack_psn = qp->r_psn; | |
2216 | /* Queue NAK for later */ | |
2217 | if (list_empty(&qp->rspwait)) { | |
01ba79d4 | 2218 | qp->r_flags |= RVT_R_RSP_NAK; |
4d6f85c3 | 2219 | rvt_get_qp(qp); |
f931551b RC |
2220 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
2221 | } | |
a5210c12 | 2222 | return; |
f931551b RC |
2223 | |
2224 | nack_acc_unlck: | |
2225 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2226 | nack_acc: | |
2227 | qib_rc_error(qp, IB_WC_LOC_PROT_ERR); | |
2228 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; | |
2229 | qp->r_ack_psn = qp->r_psn; | |
2230 | send_ack: | |
2231 | qib_send_rc_ack(qp); | |
f931551b RC |
2232 | return; |
2233 | ||
2234 | sunlock: | |
2235 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2236 | } |